/* ============================================================
   247420 design system — component sheet
   Tonal surfaces over borders. Indicator rails over hairlines.
   Friendly rounded sans body; mono only on real code.
   ============================================================ */

/* ============================================================
   Base
   ============================================================ */
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }

/* ============================================================
   Accessibility — Skip Link
   ============================================================ */
.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--accent);
  color: var(--accent-fg);
  padding: 8px 16px;
  text-decoration: none;
  z-index: 100;
  border-radius: var(--r-pill);
  font-weight: 600;
  font-size: var(--fs-sm);
}
.skip-link:focus {
  top: 10px;
  outline: 2px solid var(--fg-3);
  outline-offset: 2px;
}
body {
  background: var(--bg);
  color: var(--fg);
  font-family: var(--ff-body);
  font-size: var(--fs-body);
  line-height: var(--lh-base);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
::selection { background: var(--mascot); color: var(--ink); }

/* Every root has a CQ container so fluid type can resolve to a meaningful inline-size. */
.app, [class*="kit-"], .ds-stage {
  container-type: inline-size;
  overflow-x: clip;
  min-width: 0;
}
.app *, [class*="kit-"] * { min-width: 0; }

/* ============================================================
   Typography
   ============================================================ */
h1, .t-h1 { font-family: var(--ff-body); font-size: var(--fs-h1); line-height: var(--lh-snug); letter-spacing: var(--tr-tight); font-weight: 600; margin: 0; }
h2, .t-h2 { font-family: var(--ff-body); font-size: var(--fs-h2); line-height: var(--lh-snug); letter-spacing: var(--tr-tight); font-weight: 600; margin: 0; }
h3, .t-h3 { font-family: var(--ff-body); font-size: var(--fs-h3); line-height: var(--lh-snug); letter-spacing: -0.01em;          font-weight: 600; margin: 0; }
h4, .t-h4 { font-family: var(--ff-body); font-size: var(--fs-h4); line-height: var(--lh-snug);                                  font-weight: 600; margin: 0; }

.t-hero    { font-family: var(--ff-body); font-size: var(--fs-hero); line-height: var(--lh-tight); letter-spacing: var(--tr-tighter); font-weight: 600; margin: 0; }
.t-mega    { font-family: var(--ff-body); font-size: var(--fs-mega); line-height: 0.95;            letter-spacing: var(--tr-tighter); font-weight: 600; margin: 0; }

.t-display { font-family: var(--ff-body); font-weight: 600; letter-spacing: var(--tr-tight); }
.t-mono    { font-family: var(--ff-mono); }
.t-body    { font-family: var(--ff-body); }

.t-label   { font-family: var(--ff-mono); font-size: var(--fs-tiny); text-transform: uppercase; letter-spacing: var(--tr-label); font-weight: 500; }
.t-micro   { font-family: var(--ff-mono); font-size: var(--fs-micro); text-transform: uppercase; letter-spacing: var(--tr-label); color: var(--fg-3); }
.t-meta    { font-family: var(--ff-body); font-size: var(--fs-sm); color: var(--fg-3); }

.lede, .t-lede {
  font-family: var(--ff-body); font-size: var(--fs-xl);
  line-height: 1.4; max-width: 38ch; font-weight: 400; color: var(--fg-2);
  margin: 0;
}

.eyebrow {
  font-family: var(--ff-body);
  font-size: var(--fs-tiny);
  font-weight: 600;
  letter-spacing: var(--tr-caps);
  text-transform: uppercase;
  color: var(--accent);
  display: inline-flex; align-items: center; gap: 10px;
}
.eyebrow::before {
  content: '';
  width: 18px; height: 2px; background: currentColor;
}

.ds-prose {
  font-family: var(--ff-body);
  font-size: var(--fs-lg);
  line-height: var(--lh-long);
  max-width: var(--measure);
  text-wrap: pretty;
}
.ds-prose p  { margin: 0 0 var(--space-4); }
.ds-prose h1 { font-size: clamp(34px, 5.4cqi, 64px); margin-bottom: var(--space-3); }
.ds-prose h2 { margin: var(--space-6) 0 var(--space-3); }
.ds-prose h3 { margin: var(--space-5) 0 var(--space-2); font-size: var(--fs-lg); font-weight: 600; }

.dim { color: var(--fg-3); }

/* Links */
a { color: inherit; text-decoration: none; }
a.ds-link-accent, .ds-prose a {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 4px;
  text-decoration-thickness: 2px;
}
a.ds-link-accent:hover, .ds-prose a:hover {
  background: var(--accent); color: var(--accent-fg); text-decoration-color: transparent;
}

kbd {
  font-family: var(--ff-mono); font-size: 0.85em;
  background: var(--bg-2); padding: 2px 6px; border-radius: var(--r-1);
}

code {
  font-family: var(--ff-mono); font-size: 0.92em;
  background: var(--bg-2); padding: 0.15em 0.5em; border-radius: var(--r-1);
}

pre {
  font-family: var(--ff-mono);
  background: var(--ink);
  color: var(--paper);
  padding: var(--space-5);
  overflow-x: auto;
  line-height: 1.55;
  font-size: var(--fs-sm);
  margin: 0;
  border-radius: var(--r-3);
}
pre .k { color: var(--mascot); }
pre .s { color: var(--sun); }
pre .c { color: #9A9AA2; }
pre .n { color: var(--green-2); }

/* ============================================================
   AppShell — page frame. The topbar floats above a soft background;
   the body sits inside a rounded inner shell for a friendlier feel.
   ============================================================ */
.app {
  display: flex; flex-direction: column;
  min-height: 100vh;
  background: var(--bg);
  color: var(--fg);
  /* Notched-device safe area padding (no-op on devices without notches) */
  padding-top: env(safe-area-inset-top);
  padding-bottom: env(safe-area-inset-bottom);
  padding-left: env(safe-area-inset-left);
  padding-right: env(safe-area-inset-right);
}

/* When the app shell is embedded inside a windowed surface (e.g. the freddie
   dashboard mounted in a WM window via .fd-root) it is NOT a full-page app:
   `min-height:100vh` and the absence of an explicit width make it collapse to
   0 width at desktop, where the responsive single-column @media rules don't
   apply. Inside .fd-root it must fill its container instead. (At <=767px the
   grid already linearizes, which is why the bug only showed at desktop width.) */
.fd-root .app { width: 100%; height: 100%; min-height: 0; flex: 1 1 auto; }
.fd-root .app-body { min-width: 0; }

:root {
  --app-status-h: 42px;
  --app-topbar-h: 56px;
  --app-crumb-h: 32px;
}

.app-topbar {
  position: sticky; top: 0; z-index: var(--z-header);
  display: grid; grid-template-columns: auto 1fr auto;
  align-items: center; gap: var(--space-4);
  min-height: var(--app-topbar-h);
  padding: 10px var(--pad-x);
  background: color-mix(in oklab, var(--bg) 88%, transparent);
  backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
}
.app-topbar nav { display: flex; gap: 4px; font-size: var(--fs-sm); }
.app-topbar nav a {
  color: var(--fg-2);
  padding: 12px 14px;
  min-height: 44px;
  display: flex;
  align-items: center;
  border-radius: var(--r-pill);
  transition: background var(--dur-snap) var(--ease), color var(--dur-snap) var(--ease);
}
.app-topbar nav a:hover { background: var(--bg-2); color: var(--fg); }
.app-topbar nav a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}
.app-topbar nav a.active {
  color: var(--accent-fg);
  background: var(--accent);
  font-weight: 600;
}

.brand {
  font-family: var(--ff-body);
  font-weight: 700; font-size: var(--fs-sm);
  letter-spacing: -0.01em;
}
.brand .slash { color: var(--fg-3); font-weight: 400; margin: 0 2px; }

.app-search {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 9px 16px; background: var(--bg-2);
  border-radius: var(--r-pill);
  font-size: var(--fs-sm); color: var(--fg-3);
  max-width: 360px;
}
.app-search .icon { opacity: 0.6; }
.app-search input {
  border: 0; background: transparent;
  font-family: inherit; font-size: inherit; color: var(--fg);
  width: 100%;
}
.app-search:focus-within {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.app-crumb {
  min-height: var(--app-crumb-h);
  padding: 6px var(--pad-x);
  display: flex; align-items: center; gap: 8px;
  font-size: var(--fs-sm); color: var(--fg-3);
}
.app-crumb .sep { opacity: 0.5; }
.app-crumb .leaf { color: var(--fg); font-weight: 600; }
.app-crumb .crumb-right { margin-left: auto; color: var(--fg-3); }

.app-side-shell { background: var(--bg); }
.app-body { display: grid; grid-template-columns: 220px minmax(0, 1fr); flex: 1; min-height: 0; }
.app-body.no-side { grid-template-columns: minmax(0, 1fr); }

.app-side {
  display: flex; flex-direction: column; gap: var(--space-4);
  padding: var(--space-5) var(--space-3);
  font-size: var(--fs-sm);
}
.app-side .group {
  font-size: var(--fs-xs); font-weight: 600;
  color: var(--fg-3); padding: 0 var(--space-3);
  margin-bottom: 6px;
}
.app-side a {
  display: grid; grid-template-columns: 18px 1fr auto;
  gap: 10px; align-items: center;
  padding: 12px 14px;
  min-height: 44px;
  border-radius: var(--r-pill);
  color: var(--fg-2);
  margin-bottom: 2px;
}
.app-side a:hover { background: var(--bg-2); color: var(--fg); }
.app-side a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}
.app-side a.active {
  color: var(--accent-fg);
  background: var(--accent);
  font-weight: 600;
}
.app-side .count {
  background: var(--mascot); color: var(--ink);
  padding: 3px 10px; font-size: var(--fs-micro); font-weight: 700;
  border-radius: var(--r-pill);
}

.app-main {
  padding: var(--space-5) var(--pad-x) 0;
  min-width: 0;
}
.app-main.narrow { max-width: 760px; margin: 0 auto; }

@media (min-width: 1400px) {
  .app { max-width: 1400px; margin-left: auto; margin-right: auto; }
  .app-main .chat,
  .app-main > .chat-area,
  .app-main > .main-content { max-width: none; margin: 0; width: 100%; }
  .app-status { max-width: 1400px; margin-left: auto; margin-right: auto; left: 0; right: 0; }
}

.app-status {
  display: flex; align-items: center; gap: var(--space-3);
  min-height: var(--app-status-h);
  padding: 10px var(--pad-x);
  font-family: var(--ff-mono); font-size: var(--fs-xs);
  color: var(--fg-3);
}
.app-status .item { color: inherit; }
.app-status .item:first-of-type { color: var(--accent); }
.app-status .spread { flex: 1; }

/* ============================================================
   Primitives
   ============================================================ */
.btn, .btn-primary, .btn-ghost {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 13px 22px;
  font-family: var(--ff-body);
  font-weight: 600; font-size: var(--fs-sm);
  text-decoration: none;
  cursor: pointer;
  border-radius: var(--r-pill);
  border: 0;
  transition: transform var(--dur-snap) var(--ease), background var(--dur-snap) var(--ease), color var(--dur-snap) var(--ease);
}
.btn { background: var(--bg-2); color: var(--fg); }
.btn:hover { background: var(--bg-3); color: var(--fg); }
.btn-primary { background: var(--accent); color: var(--accent-fg); }
.btn-primary:hover { background: var(--fg); color: var(--bg); }
.btn-ghost { background: transparent; color: var(--fg); box-shadow: inset 0 0 0 1.5px var(--rule-strong); }
.btn-ghost:hover { background: var(--bg-2); }
.btn:active, .btn-primary:active, .btn-ghost:active { transform: translateY(1px); }
.btn:focus-visible, .btn-primary:focus-visible, .btn-ghost:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.chip {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 3px 10px;
  background: var(--bg-2); color: var(--fg-2);
  font-family: var(--ff-body);
  font-size: var(--fs-tiny); font-weight: 600;
  letter-spacing: var(--tr-caps); text-transform: uppercase;
  border-radius: var(--r-pill);
}
.chip.tone-green   { background: var(--green-tint);  color: var(--green-deep); }
.chip.tone-purple  { background: var(--purple-tint); color: var(--purple-deep); }
.chip.tone-mascot  { background: var(--mascot-tint); color: var(--ink); }
.chip.tone-sun     { background: var(--sun);         color: var(--ink); }
.chip.tone-flame   { background: var(--flame);       color: var(--paper); }
.chip.tone-live    { background: var(--green-tint);  color: var(--green-deep); }
.chip.tone-wip     { background: var(--bg-3);        color: var(--fg-2); }

.glyph {
  display: inline-flex; align-items: center; justify-content: center;
  width: 18px; height: 18px;
  font-family: var(--ff-mono); font-size: 13px;
  opacity: 0.8;
}

/* ============================================================
   Panel — soft tonal container, no border decoration
   ============================================================ */
.panel {
  background: var(--bg);
  border-radius: var(--r-3);
  margin: 0 0 var(--space-5);
  position: relative;
}
.panel.panel-inline { background: var(--bg-2); padding: var(--space-3) var(--space-3); }
.panel.panel-wide   { background: transparent; }
.panel-head {
  display: flex; align-items: baseline; justify-content: space-between;
  padding: var(--space-4) var(--space-5) var(--space-3);
  font-size: var(--fs-xs); font-weight: 600;
  color: var(--fg-3);
  letter-spacing: var(--tr-caps); text-transform: uppercase;
}
.panel-head > :last-child {
  font-weight: 500; color: var(--fg-3);
  font-family: var(--ff-mono); letter-spacing: 0;
}
.panel-body { padding: var(--space-2) var(--space-3) var(--space-3); }
.panel.panel-wide .panel-body { padding: 0; }

/* ============================================================
   Row — primary list pattern. Indicator rail on the left,
   no hairlines between rows.
   ============================================================ */
.row {
  display: grid;
  grid-template-columns: minmax(80px, 12ch) minmax(0, 1fr) auto;
  gap: var(--space-3);
  align-items: baseline;
  padding: 18px 22px;
  background: var(--bg);
  border-radius: var(--r-2);
  color: var(--fg);
  position: relative;
  transition: background var(--dur-snap) var(--ease), padding var(--dur-base) var(--ease);
}
.row + .row { margin-top: 4px; }
.row::before {
  content: '';
  position: absolute; left: 6px; top: 22%; bottom: 22%; width: 3px;
  background: transparent; border-radius: 3px;
  transition: background var(--dur-snap) var(--ease);
}
.row:hover { background: var(--bg-2); }
.row:hover::before { background: var(--rule-strong); }
.row.active { background: color-mix(in oklab, var(--accent) 10%, var(--bg-2)); }
.row.active::before { background: var(--accent); }
.row-grid { /* explicit grid-template-columns set inline */ }

.row .code  { font-family: var(--ff-mono); font-size: var(--fs-xs); color: var(--fg-3); }
.row .title { font-family: var(--ff-body); font-weight: 600; font-size: var(--fs-lg); display: flex; align-items: baseline; gap: 10px; flex-wrap: wrap; }
.row .sub   { font-family: var(--ff-body); font-weight: 400; font-size: var(--fs-sm); color: var(--fg-3); }
.row .meta  { font-family: var(--ff-mono); font-size: var(--fs-xs); color: var(--fg-3); text-align: right; }

a.row { text-decoration: none; }

/* ============================================================
   Hero
   ============================================================ */
.ds-hero {
  padding: var(--space-9) 0 var(--space-8);
  display: grid; gap: var(--space-5);
  max-width: 940px;
}
.ds-hero-title {
  font-family: var(--ff-body); font-weight: 600;
  font-size: clamp(34px, 6.4cqi, 80px);
  line-height: 1.05; letter-spacing: var(--tr-tight);
  margin: 0; max-width: 18ch;
}
.ds-hero-body {
  font-family: var(--ff-body); font-size: var(--fs-xl);
  line-height: 1.45; margin: 0; max-width: 52ch;
  color: var(--fg-2);
}
.ds-hero-accent { color: var(--accent); font-weight: 500; }

/* ============================================================
   Section grouping
   ============================================================ */
.ds-section { margin: var(--space-8) 0; }
.ds-section > h3 {
  font-family: var(--ff-body); font-weight: 600; font-size: var(--fs-h3);
  margin: 0 0 var(--space-5);
  letter-spacing: -0.01em;
}

/* ============================================================
   Install — single CLI command card
   ============================================================ */
.cli {
  display: flex; align-items: center; gap: 14px;
  padding: 20px 24px;
  background: var(--ink); color: var(--paper);
  border-radius: var(--r-3);
  font-family: var(--ff-mono); font-size: var(--fs-lg);
}
.cli .prompt { color: var(--green-2); }
.cli .cmd    { flex: 1; min-width: 0; overflow-x: auto; white-space: nowrap; color: var(--paper); }
.cli .copy   {
  padding: 8px 16px; background: transparent; color: var(--paper);
  font-size: var(--fs-tiny); text-transform: uppercase; letter-spacing: var(--tr-caps);
  cursor: pointer; box-shadow: inset 0 0 0 1px #6A6A70;
  border-radius: var(--r-pill);
}
.cli .copy:hover { background: #6A6A70; }

/* ============================================================
   Receipt — key/value table
   ============================================================ */
table.kv { width: 100%; border-collapse: collapse; }
table.kv td {
  padding: 8px 0;
  font-family: var(--ff-body); font-size: var(--fs-sm);
}
table.kv tr + tr td { border-top: 1px solid var(--rule); }
table.kv td:first-child {
  color: var(--fg-3);
  font-size: var(--fs-xs);
  text-transform: uppercase; letter-spacing: var(--tr-caps);
  width: 14ch;
}
table.kv td:last-child {
  font-weight: 600;
}

/* ============================================================
   Generic table
   ============================================================ */
table {
  width: 100%; border-collapse: collapse;
  font-family: var(--ff-body); font-size: var(--fs-sm);
  border-radius: var(--r-3); overflow: hidden;
}
table th {
  text-align: left;
  padding: 12px 16px;
  font-size: var(--fs-xs); font-weight: 600;
  color: var(--fg-3); text-transform: uppercase; letter-spacing: var(--tr-caps);
  background: var(--bg-2);
}
table td { padding: 14px 16px; border-top: 1px solid var(--rule); }
table tr.clickable { cursor: pointer; }
table tr.clickable:hover td { background: var(--bg-2); }

/* ============================================================
   Changelog
   ============================================================ */
.ds-changelog-row {
  grid-template-columns: minmax(110px, 14ch) minmax(60px, 9ch) minmax(0, 1fr) !important;
}
.ds-changelog-ver {
  font-family: var(--ff-body); font-weight: 600; font-size: var(--fs-sm);
}

/* ============================================================
   Works
   ============================================================ */
.work-detail {
  padding: var(--space-4) var(--space-5) var(--space-5);
  margin: 4px 0 var(--space-2);
  background: var(--bg-2);
  border-radius: var(--r-3);
  display: flex; flex-direction: column; gap: var(--space-3);
}
.ds-work-body { margin: 0; max-width: 60ch; }
.ds-work-actions { display: flex; gap: 10px; flex-wrap: wrap; }

/* ============================================================
   Manifesto / pull moment
   ============================================================ */
.ds-manifesto { max-width: 60ch; }
.ds-manifesto-para {
  font-family: var(--ff-body); font-size: var(--fs-lg);
  line-height: var(--lh-long); margin: 0 0 var(--space-3);
}
.ds-manifesto-para.dim { color: var(--fg-3); }

/* ============================================================
   Currently shipping dots
   ============================================================ */
.ds-dot-on  { color: var(--green-2); }
.ds-dot-off { color: var(--fg-3); }
.ds-dot-live { color: var(--green-2); }
.ds-dot-idle { color: var(--fg-3); }

/* ============================================================
   KPI
   ============================================================ */
.kpi {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: var(--space-2);
}
.kpi-card {
  padding: var(--space-5);
  background: var(--bg-2);
  border-radius: var(--r-3);
}
.kpi-card .num {
  font-family: var(--ff-body); font-weight: 600;
  font-size: clamp(30px, 3.6cqi, 48px); line-height: 1;
  letter-spacing: var(--tr-tight);
}
.kpi-card .lbl {
  font-size: var(--fs-xs); color: var(--fg-3);
  font-weight: 600; margin-top: 8px;
  letter-spacing: var(--tr-caps); text-transform: uppercase;
}

/* ============================================================
   Empty state
   ============================================================ */
.empty {
  padding: var(--space-8);
  text-align: center;
  color: var(--fg-3);
  background: var(--bg-2);
  border-radius: var(--r-3);
  font-size: var(--fs-sm);
}

/* ============================================================
   Form
   ============================================================ */
.row-form {
  display: grid; gap: 12px;
  padding: var(--space-5);
  background: var(--bg-2);
  border-radius: var(--r-3);
}
.row-form input,
.row-form textarea {
  font-family: inherit; font-size: var(--fs-sm);
  padding: 12px 16px;
  background: var(--bg); color: var(--fg);
  border: 0; border-radius: var(--r-2);
  box-shadow: inset 0 0 0 1px var(--rule);
}
.row-form input:focus,
.row-form textarea:focus { box-shadow: inset 0 0 0 2px var(--accent); }

/* ============================================================
   Responsive Design — Mobile (480px), Tablet (1024px), Desktop (1440px+)
   ============================================================ */

/* ────────────────────────────────────────────────────────────────────
   Mobile Portrait Breakpoint (480px and below)
   ────────────────────────────────────────────────────────────────────── */
@media (max-width: 480px) {
  /* App Layout — drawer handled in 900px block below */
  .app-body { grid-template-columns: 1fr !important; }
  .app-body.no-side { grid-template-columns: 1fr; }

  /* Topbar Navigation */
  .app-topbar {
    grid-template-columns: 1fr auto;
    gap: var(--space-2); padding: 12px var(--space-3);
  }
  .app-topbar nav a {
    padding: 12px 10px;
    min-height: 44px;
  }
  .app-topbar nav {
    display: none; /* Hide full nav on very small screens */
  }
  .brand { font-size: var(--fs-tiny); font-weight: 600; }

  /* Search */
  .app-search {
    display: none; /* Hide search on mobile unless explicitly pinned */
  }

  /* Main Content */
  .app-main { padding: var(--space-4) var(--space-2); }
  .app-main.narrow { max-width: 100%; margin: 0; }

  /* Typography Scaling */
  .t-hero { font-size: clamp(28px, 8vw, 48px); }
  .t-mega { font-size: clamp(24px, 6vw, 42px); }
  h1, .t-h1 { font-size: clamp(22px, 6vw, 36px); }
  h2, .t-h2 { font-size: clamp(18px, 5vw, 28px); }
  h3, .t-h3 { font-size: clamp(16px, 4.5vw, 24px); }

  /* Panel & Row */
  .panel { margin: 0 0 var(--space-3); }
  .panel-head { padding: var(--space-3) var(--space-2); gap: var(--space-2); }
  .panel-body { padding: var(--space-2); overflow-x: auto; -webkit-overflow-scrolling: touch; }
  .panel-body > table { min-width: 100%; }

  .row {
    grid-template-columns: minmax(0, 1fr) auto !important;
    gap: var(--space-2); padding: 12px 16px;
    row-gap: 4px !important;
  }
  .row .sub { grid-column: 1 / -1; order: 3; }
  .row .title { font-size: var(--fs-sm); }

  /* Buttons */
  .btn, .btn-primary, .btn-ghost {
    padding: 11px 16px; font-size: var(--fs-tiny);
    min-height: 44px; /* Touch target minimum */
  }

  /* File Grid */
  .ds-file-grid {
    display: flex;
    flex-direction: column;
    gap: 3px;
  }
  .ds-file-row {
    grid-template-columns: 22px minmax(0, 1fr) auto;
    gap: 10px; padding: 10px 12px;
    font-size: var(--fs-xs);
  }
  /* On mobile, fold meta under the title and keep actions inline. */
  .ds-file-row .ds-file-meta { font-size: var(--fs-micro); }
  .ds-file-row .ds-file-actions { opacity: 1; }

  /* Chat */
  .chat-stack { max-width: 100%; min-width: 0; }
  .chat-bubble {
    max-width: clamp(200px, 85vw, 320px);
    padding: 10px 12px; font-size: var(--fs-sm);
  }
  .chat-avatar { width: 28px; height: 28px; font-size: 11px; }
  .chat-msg:hover { padding: 4px 0; margin: 0; background: transparent; }
  .chat-composer { padding: 8px; gap: 6px; }
  .chat-composer textarea { padding: 10px 12px; font-size: var(--fs-sm); }
  .chat-composer .send,
  .chat-composer button { width: 40px; height: 40px; font-size: 16px; }

  /* KPI Cards */
  .kpi {
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: var(--space-2);
  }
  .kpi-card { padding: var(--space-3); }
  .kpi-card .num { font-size: clamp(22px, 5vw, 32px); }

  /* Empty State */
  .empty { padding: var(--space-5); font-size: var(--fs-xs); }

  /* Form */
  .row-form { gap: 10px; padding: var(--space-3); }
  .row-form input,
  .row-form textarea { padding: 11px 12px; font-size: var(--fs-sm); }

  /* Hero Section */
  .ds-hero { padding: var(--space-6) 0 var(--space-5); }
  .ds-hero-title { font-size: clamp(28px, 7vw, 48px); max-width: 100%; }
  .ds-hero-body { font-size: var(--fs-lg); max-width: 100%; }

  /* Table Responsiveness */
  table { font-size: var(--fs-xs); }
  table th,
  table td { padding: 10px 12px; }

  /* CLI Block */
  .cli {
    flex-direction: column; align-items: flex-start; gap: 10px;
    padding: 16px 12px; font-size: var(--fs-xs);
  }
  .cli .copy { padding: 6px 12px; font-size: var(--fs-micro); }
}

/* ────────────────────────────────────────────────────────────────────
   Container Query Responsive (720px and below)
   ────────────────────────────────────────────────────────────────────── */
@container (max-width: 760px) {
  .app-body { grid-template-columns: 1fr !important; }
  .app-side-shell { border-right: 0; border-bottom: 1px solid var(--rule); }
  .app-topbar { grid-template-columns: 1fr auto; }
  .app-topbar nav { font-size: var(--fs-xs); gap: 14px; }
  .row { grid-template-columns: minmax(0, 1fr) auto !important; row-gap: 4px !important; }
  .row .sub { grid-column: 1 / -1; order: 3; }
}

/* ────────────────────────────────────────────────────────────────────
   Tablet Landscape Breakpoint (768px to 1024px)
   ────────────────────────────────────────────────────────────────────── */
@media (min-width: 481px) and (max-width: 1024px) {
  /* App Layout — side handled by 900px drawer block; restore for 901-1024 */
  .app-side a {
    padding: 12px 12px; gap: 8px;
    grid-template-columns: 16px 1fr auto;
    font-size: var(--fs-xs);
    min-height: 44px;
  }

  /* Topbar Navigation */
  .app-topbar {
    grid-template-columns: auto 1fr auto;
    gap: var(--space-3); padding: 12px var(--space-4);
  }
  .app-topbar nav {
    display: flex; gap: 8px; font-size: var(--fs-xs);
    flex-wrap: wrap;
  }
  .app-topbar nav a {
    padding: 12px 12px; font-size: var(--fs-xs);
    min-height: 44px;
  }
  .brand { font-size: var(--fs-sm); }

  /* Search */
  .app-search {
    display: inline-flex;
    max-width: 280px; font-size: var(--fs-xs);
    padding: 8px 14px;
  }

  /* Main Content */
  .app-main { padding: var(--space-6) var(--space-4); }
  .app-main.narrow { max-width: 100%; }

  /* Typography */
  .t-hero { font-size: clamp(32px, 6.5cqi, 56px); }
  .t-mega { font-size: clamp(28px, 5.5cqi, 80px); }
  h1, .t-h1 { font-size: clamp(24px, 5cqi, 48px); }
  h2, .t-h2 { font-size: clamp(20px, 4cqi, 36px); }
  h3, .t-h3 { font-size: clamp(18px, 3.5cqi, 28px); }

  /* File list — single column rows on tablet (cards only via data-columns) */
  .ds-file-row {
    grid-template-columns: 24px minmax(0, 1fr) auto auto;
    gap: 12px; padding: 12px 14px;
  }

  /* Chat Bubbles */
  .chat-stack { max-width: min(75%, 420px); }
  .chat-bubble {
    max-width: clamp(220px, 75vw, 420px);
    padding: 11px 14px; font-size: var(--fs-sm);
  }
  .chat-avatar { width: 32px; height: 32px; font-size: 12px; }

  /* KPI Cards */
  .kpi {
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: var(--space-3);
  }

  /* Buttons */
  .btn, .btn-primary, .btn-ghost {
    padding: 12px 18px; font-size: var(--fs-sm);
  }

  /* Panel */
  .panel-head { padding: var(--space-4) var(--space-4); }
  .panel-body { padding: var(--space-2) var(--space-3); }

  /* Hero */
  .ds-hero { padding: var(--space-7) 0 var(--space-6); max-width: 100%; }
  .ds-hero-title { font-size: clamp(32px, 6cqi, 56px); max-width: 100%; }

  /* Row */
  .row {
    grid-template-columns: minmax(90px, 12ch) minmax(0, 1fr) auto;
    gap: var(--space-2); padding: 14px 16px;
  }
}

/* ────────────────────────────────────────────────────────────────────
   Desktop Breakpoint Enhancements (1025px and up)
   ────────────────────────────────────────────────────────────────────── */
@media (min-width: 1025px) {
  /* Chat Bubbles */
  .chat-stack { max-width: min(70%, 480px); }
  .chat-bubble {
    max-width: clamp(240px, 70vw, 480px);
  }

  /* KPI Cards */
  .kpi {
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: var(--space-3);
  }
}

/* ============================================================
   Chat — minimal styles (placeholder for full chat surface)
   ============================================================ */
.ds-chat { display: flex; flex-direction: column; gap: 12px; padding: var(--space-4); }
.ds-chat-msg { padding: 12px 18px; background: var(--bg-2); border-radius: var(--r-3); max-width: min(90vw, 36em); }
.ds-chat-msg.user { background: var(--accent); color: var(--accent-fg); align-self: flex-end; }
.ds-chat-md { font-size: var(--fs-sm); line-height: 1.6; }
.ds-chat-composer { display: flex; gap: 8px; padding: var(--space-4); }
.ds-chat-composer input { flex: 1; padding: 13px 18px; background: var(--bg-2); border: 0; border-radius: var(--r-pill); font-family: inherit; font-size: var(--fs-sm); color: var(--fg); }
.ds-chat-composer input:focus { box-shadow: inset 0 0 0 2px var(--accent); }

/* ============================================================
   File surface — responsive grid + row layouts
   ============================================================ */

/* Default file grid — a vertical list of rows. Each row lays out its own
   columns internally; the container only stacks them. Card mode (multi-column)
   is opt-in via [data-columns]. */
.ds-file-grid {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

/* File row — linear layout (icon · title · meta · actions) */
.ds-file-row {
  display: grid; grid-template-columns: 26px minmax(0, 1fr) auto auto;
  gap: 14px; align-items: center;
  padding: 11px 16px; background: var(--bg);
  border: var(--bw-hair) solid transparent;
  border-radius: var(--r-2); color: var(--fg);
  cursor: pointer;
  transition: background var(--dur-snap) var(--ease),
              border-color var(--dur-snap) var(--ease),
              transform var(--dur-snap) var(--ease);
}
.ds-file-row:hover {
  background: var(--bg-2);
  border-color: var(--rule);
}
.ds-file-row:active { transform: translateY(1px); }
.ds-file-row.active { background: var(--accent-tint); border-color: var(--accent); }
.ds-file-row[data-file-type="dir"]      { border-left-width: 3px; border-left-color: var(--accent); }
.ds-file-row[data-file-type="image"]    { border-left-width: 3px; border-left-color: var(--mascot); }
.ds-file-row[data-file-type="video"]    { border-left-width: 3px; border-left-color: var(--purple-2); }
.ds-file-row[data-file-type="audio"]    { border-left-width: 3px; border-left-color: var(--sky); }
.ds-file-row[data-file-type="code"]     { border-left-width: 3px; border-left-color: var(--green-2); }
.ds-file-row[data-file-type="text"]     { border-left-width: 3px; border-left-color: var(--ink-3); }
.ds-file-row[data-file-type="archive"]  { border-left-width: 3px; border-left-color: var(--flame); }
.ds-file-row[data-file-type="document"] { border-left-width: 3px; border-left-color: var(--sun); }
.ds-file-row[data-file-type="symlink"]  { border-left-width: 3px; border-left-color: var(--purple); }
.ds-file-row[data-file-type="other"]    { border-left-width: 3px; border-left-color: var(--fg-3); }

/* Row internals — these are the classes FileRow actually renders. */
.ds-file-row .title {
  font-weight: 500; font-size: var(--fs-sm);
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
  min-width: 0;
}
.ds-file-row .code {
  font-family: var(--ff-mono); font-size: var(--fs-micro);
  color: var(--fg-3);
}
.ds-file-row .ds-file-meta {
  font-family: var(--ff-mono); font-size: var(--fs-xs);
  color: var(--fg-3); white-space: nowrap;
}

/* File icon — glyph chip, tinted per type. */
.ds-file-icon {
  display: inline-flex; align-items: center; justify-content: center;
  width: 26px; height: 26px; font-size: 15px; line-height: 1;
  color: var(--fg-2);
}
.ds-file-row[data-file-type="dir"]      .ds-file-icon { color: var(--accent); }
.ds-file-row[data-file-type="image"]    .ds-file-icon { color: var(--mascot); }
.ds-file-row[data-file-type="video"]    .ds-file-icon { color: var(--purple-2); }
.ds-file-row[data-file-type="audio"]    .ds-file-icon { color: var(--sky); }
.ds-file-row[data-file-type="code"]     .ds-file-icon { color: var(--green-2); }
.ds-file-row[data-file-type="archive"]  .ds-file-icon { color: var(--flame); }
.ds-file-row[data-file-type="document"] .ds-file-icon { color: var(--sun); }

/* Row actions — hidden until hover/focus, revealed without layout shift. */
.ds-file-actions {
  display: inline-flex; gap: 2px; align-items: center;
  opacity: 0; transition: opacity var(--dur-base) var(--ease);
}
.ds-file-row:hover .ds-file-actions,
.ds-file-row:focus-within .ds-file-actions { opacity: 1; }
.ds-file-act {
  display: inline-flex; align-items: center; justify-content: center;
  width: 28px; height: 28px; padding: 0;
  background: transparent; border: 0; border-radius: var(--r-1);
  color: var(--fg-3); font-size: 14px; cursor: pointer;
  transition: background var(--dur-snap) var(--ease), color var(--dur-snap) var(--ease);
}
.ds-file-act:hover { background: var(--bg-3); color: var(--fg); }
.ds-file-act-warn:hover { background: color-mix(in oklab, var(--warn) 18%, var(--bg)); color: var(--warn); }

/* Card mode — opt-in via data-columns; switches the list to a grid. */
.ds-file-grid[data-columns] { display: grid; gap: var(--space-3); }
.ds-file-grid[data-columns="1"] { grid-template-columns: 1fr; }
.ds-file-grid[data-columns="2"] { grid-template-columns: repeat(2, 1fr); }
.ds-file-grid[data-columns="3"] { grid-template-columns: repeat(3, 1fr); }
.ds-file-grid[data-columns="4"] { grid-template-columns: repeat(4, 1fr); }

/* ============================================================
   File browser surface — stage, toolbar, breadcrumb, dropzone,
   upload progress, empty state, modals, preview. Authored for
   fsbrowse but lives in the shared kit under .ds-247420 scope.
   ============================================================ */

/* Stage — the scrollable content column. */
.ds-file-stage {
  display: flex; flex-direction: column; gap: var(--space-3);
  width: 100%; max-width: 920px; margin: 0 auto;
  padding: var(--space-2) var(--space-3) var(--space-4);
}
/* When the stage is the app-main child, the shell already supplies top
   padding — collapse the stage's own so content isn't pushed down. */
.app-main > div > .ds-file-stage,
.app-main .ds-file-stage { padding-top: 0; }

/* Breadcrumb path */
.ds-crumb-path {
  display: flex; align-items: center; flex-wrap: wrap; gap: 2px;
  font-size: var(--fs-sm);
}
.ds-crumb-seg {
  background: transparent; border: 0; cursor: pointer;
  padding: 4px 8px; border-radius: var(--r-1);
  color: var(--fg-3); font-family: inherit; font-size: var(--fs-sm);
  transition: background var(--dur-snap) var(--ease), color var(--dur-snap) var(--ease);
}
.ds-crumb-seg:hover { background: var(--bg-2); color: var(--fg); }
.ds-crumb-seg.leaf { color: var(--fg); font-weight: 600; }
.ds-crumb-sep { color: var(--fg-3); opacity: 0.6; user-select: none; }

/* Toolbar */
.ds-file-toolbar {
  display: flex; align-items: center; justify-content: space-between;
  gap: var(--space-2); flex-wrap: wrap;
}
.ds-file-toolbar-left,
.ds-file-toolbar-right {
  display: flex; align-items: center; gap: var(--space-2); flex-wrap: wrap;
}
.ds-meta-mono {
  font-family: var(--ff-mono); font-size: var(--fs-xs);
  color: var(--fg-3); letter-spacing: var(--tr-caps);
}

/* Error banner — dismissible toast row. */
.ds-error-banner {
  padding: 10px 14px; border-radius: var(--r-2);
  background: color-mix(in oklab, var(--warn) 14%, var(--bg));
  border: var(--bw-hair) solid color-mix(in oklab, var(--warn) 40%, transparent);
  color: var(--warn); font-size: var(--fs-sm); cursor: pointer;
}
.ds-error-banner:hover { background: color-mix(in oklab, var(--warn) 20%, var(--bg)); }

/* Dropzone */
.ds-dropzone {
  border: var(--bw-rule) dashed var(--rule);
  border-radius: var(--r-3); background: var(--bg);
  transition: border-color var(--dur-base) var(--ease), background var(--dur-base) var(--ease);
}
.ds-dropzone-inner {
  display: flex; align-items: center; justify-content: center;
  gap: var(--space-2); flex-wrap: wrap;
  padding: var(--space-4) var(--space-3); text-align: center;
}
.ds-dropzone-glyph { font-size: 22px; color: var(--fg-3); }
.ds-dropzone-label { font-size: var(--fs-sm); color: var(--fg-3); }
.ds-dropzone.dragover {
  border-color: var(--accent);
  background: var(--accent-tint);
}
@media (prefers-reduced-motion: no-preference) {
  .ds-dropzone.dragover { animation: ds-dropzone-pulse 1.1s var(--ease) infinite; }
}
.ds-dropzone.dragover .ds-dropzone-glyph,
.ds-dropzone.dragover .ds-dropzone-label { color: var(--accent); }
@keyframes ds-dropzone-pulse {
  0%, 100% { border-color: var(--accent); }
  50% { border-color: color-mix(in oklab, var(--accent) 45%, transparent); }
}

/* Upload progress */
.ds-upload-progress { display: flex; flex-direction: column; gap: 6px; }
.ds-upload-item {
  display: grid; grid-template-columns: minmax(0, 1fr) 120px 44px;
  gap: var(--space-2); align-items: center;
  padding: 8px 12px; border-radius: var(--r-2);
  background: var(--bg-2); font-size: var(--fs-xs);
}
.ds-upload-name { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.ds-upload-bar {
  height: 6px; border-radius: var(--r-pill);
  background: var(--bg-3); overflow: hidden;
}
.ds-upload-fill {
  display: block; height: 100%; width: 0;
  background: var(--accent); border-radius: var(--r-pill);
  transition: width var(--dur-base) var(--ease);
}
.ds-upload-pct {
  font-family: var(--ff-mono); font-size: var(--fs-micro);
  color: var(--fg-3); text-align: right;
}
.ds-upload-item.done .ds-upload-fill { background: var(--success); }
.ds-upload-item.done .ds-upload-pct { color: var(--success); }
.ds-upload-item.error .ds-upload-fill { background: var(--warn); }
.ds-upload-item.error .ds-upload-pct { color: var(--warn); }

/* Empty state */
.ds-file-empty {
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: var(--space-2); padding: var(--space-6) var(--space-3);
  color: var(--fg-3); text-align: center;
}
.ds-file-empty-glyph { font-size: 34px; opacity: 0.55; }
.ds-file-empty-text { font-size: var(--fs-sm); }

/* ── Modals ───────────────────────────────────────────────── */
.ds-modal-backdrop {
  position: fixed; inset: 0; z-index: var(--z-modal, 800);
  display: flex; align-items: center; justify-content: center;
  padding: var(--space-3);
  background: color-mix(in oklab, var(--ink) 55%, transparent);
  backdrop-filter: blur(3px);
}
@media (prefers-reduced-motion: no-preference) {
  .ds-modal-backdrop { animation: ds-modal-fade var(--dur-base) var(--ease); }
}
@keyframes ds-modal-fade { from { opacity: 0; } to { opacity: 1; } }
.ds-modal {
  display: flex; flex-direction: column;
  width: 100%; max-width: 460px; max-height: calc(100vh - 2 * var(--space-4));
  background: var(--bg); color: var(--fg);
  border: var(--bw-hair) solid var(--rule);
  border-radius: var(--r-3); box-shadow: var(--shadow-3);
  overflow: hidden;
}
@media (prefers-reduced-motion: no-preference) {
  .ds-modal { animation: ds-modal-rise var(--dur-base) var(--ease); }
}
@keyframes ds-modal-rise {
  from { opacity: 0; transform: translateY(8px) scale(0.98); }
  to   { opacity: 1; transform: none; }
}
.ds-modal-small { max-width: 380px; }
.ds-modal-preview { max-width: 880px; }
.ds-modal-head {
  padding: var(--space-3) var(--space-4);
  font-weight: 600; font-size: var(--fs-body);
  border-bottom: var(--bw-hair) solid var(--rule);
}
.ds-modal-body { padding: var(--space-4); overflow: auto; font-size: var(--fs-sm); }
.ds-modal-actions {
  display: flex; justify-content: flex-end; gap: var(--space-2);
  padding: var(--space-3) var(--space-4);
  border-top: var(--bw-hair) solid var(--rule);
}
.ds-modal-input {
  width: 100%; padding: 10px 12px;
  background: var(--bg-2); border: var(--bw-hair) solid var(--rule);
  border-radius: var(--r-2); color: var(--fg);
  font-family: inherit; font-size: var(--fs-sm);
}
.ds-modal-input:focus { outline: 2px solid var(--accent); outline-offset: 1px; }
.btn-primary.danger {
  background: var(--warn);
  border-color: var(--warn);
  color: #fff;
}

/* ── Preview ──────────────────────────────────────────────── */
.ds-preview-head {
  display: flex; align-items: center; gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  border-bottom: var(--bw-hair) solid var(--rule);
}
.ds-preview-name {
  font-weight: 600; font-size: var(--fs-body);
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap; min-width: 0;
}
.ds-preview-meta {
  font-family: var(--ff-mono); font-size: var(--fs-xs);
  color: var(--fg-3); white-space: nowrap;
}
.ds-preview-actions { display: inline-flex; gap: 2px; margin-left: auto; }
.ds-preview-body {
  flex: 1; min-height: 0; overflow: auto;
  padding: var(--space-3) var(--space-4);
  display: flex; flex-direction: column;
}
.ds-preview-media {
  max-width: 100%; max-height: 70vh; margin: 0 auto;
  border-radius: var(--r-2); object-fit: contain;
}
.ds-preview-audio { width: 100%; }
.ds-preview-code,
.ds-preview-text {
  margin: 0; flex: 1; min-height: 0; overflow: auto;
  padding: var(--space-3);
  background: var(--ink); color: var(--paper);
  border-radius: var(--r-2);
  font-family: var(--ff-mono); font-size: var(--fs-xs); line-height: var(--lh-base);
  white-space: pre; tab-size: 2;
}
.ds-preview-text { white-space: pre-wrap; word-break: break-word; }
.ds-preview-code code, .ds-preview-text code { font: inherit; color: inherit; background: none; }
.ds-preview-truncated {
  margin-top: var(--space-2); padding-top: var(--space-2);
  border-top: var(--bw-hair) solid color-mix(in oklab, var(--paper) 20%, transparent);
  color: var(--paper-3); font-size: var(--fs-micro);
}
.ds-preview-fallback {
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: var(--space-2); padding: var(--space-6); color: var(--fg-3);
}
.ds-preview-glyph { font-size: 34px; opacity: 0.6; }

/* Thin scrollbars inside preview bodies. */
.ds-preview-code, .ds-preview-text, .ds-modal-body, .ds-preview-body {
  scrollbar-width: thin;
}
.ds-preview-code::-webkit-scrollbar,
.ds-preview-text::-webkit-scrollbar,
.ds-preview-body::-webkit-scrollbar,
.ds-modal-body::-webkit-scrollbar { width: 10px; height: 10px; }
.ds-preview-code::-webkit-scrollbar-thumb,
.ds-preview-text::-webkit-scrollbar-thumb {
  background: color-mix(in oklab, var(--paper) 28%, transparent);
  border-radius: var(--r-pill); border: 2px solid transparent; background-clip: padding-box;
}
.ds-preview-body::-webkit-scrollbar-thumb,
.ds-modal-body::-webkit-scrollbar-thumb {
  background: var(--bg-3); border-radius: var(--r-pill);
}

/* Mobile — modals go near-fullscreen, preview media shrinks. */
@media (max-width: 560px) {
  .ds-modal { max-width: 100%; max-height: calc(100vh - 2 * var(--space-3)); }
  .ds-modal-preview { width: 100%; height: calc(100vh - 2 * var(--space-3)); max-height: none; }
  .ds-preview-media { max-height: 50vh; }
  .ds-file-stage { padding: var(--space-3) var(--space-2); }
}

/* ── File browser UX affordances ──────────────────────────── */
/* Toolbar filter input — compact search box. */
.ds-filter-input {
  width: clamp(120px, 22vw, 220px);
  padding: 7px 12px;
  background: var(--bg-2); border: var(--bw-hair) solid var(--rule);
  border-radius: var(--r-pill); color: var(--fg);
  font-family: inherit; font-size: var(--fs-xs);
}
.ds-filter-input:focus { outline: 2px solid var(--accent); outline-offset: 1px; }

/* Loading skeleton — placeholder rows while a directory loads. */
.ds-file-grid-loading { display: flex; flex-direction: column; gap: 4px; }
.ds-file-skeleton {
  height: 48px; border-radius: var(--r-2);
  background: linear-gradient(90deg,
    var(--bg) 0%, var(--bg-2) 50%, var(--bg) 100%);
  background-size: 200% 100%;
}
@media (prefers-reduced-motion: no-preference) {
  .ds-file-skeleton { animation: ds-skeleton-shimmer 1.2s var(--ease) infinite; }
}
@keyframes ds-skeleton-shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* Drag-to-move drop target highlight on a directory row. */
.ds-file-row.ds-drop-target {
  border-color: var(--accent);
  background: var(--accent-tint);
  box-shadow: inset 0 0 0 1px var(--accent);
}
.ds-file-row[draggable="true"] { cursor: grab; }
.ds-file-row[draggable="true"]:active { cursor: grabbing; }

/* Multi-select — per-row checkbox overlay + selected state + bulk bar. */
.ds-file-row { position: relative; }
.ds-file-check {
  position: absolute; left: 4px; top: 50%; transform: translateY(-50%);
  width: 18px; height: 18px; padding: 0; z-index: 1;
  display: inline-flex; align-items: center; justify-content: center;
  border: var(--bw-hair) solid var(--rule); border-radius: 5px;
  background: var(--bg); color: var(--accent-fg);
  font-size: 11px; line-height: 1; cursor: pointer;
  opacity: 0; transition: opacity var(--dur-base) var(--ease), background var(--dur-snap) var(--ease);
}
.ds-file-row:hover .ds-file-check,
.ds-file-row:focus-within .ds-file-check,
.ds-file-check.on { opacity: 1; }
/* Touch / coarse-pointer devices have no hover — keep checkboxes visible so
   multi-select is reachable without a pointer. */
@media (hover: none), (pointer: coarse) {
  .ds-file-check { opacity: 1; }
}
.ds-file-check.on { background: var(--accent); border-color: var(--accent); }
.ds-file-row.selected {
  background: var(--accent-tint);
  border-color: var(--accent);
}
.ds-file-row.selected:hover { background: color-mix(in oklab, var(--accent) 22%, var(--bg)); }

.ds-bulk-bar {
  display: flex; align-items: center; flex-wrap: wrap; gap: var(--space-2);
  padding: 10px 14px; border-radius: var(--r-2);
  background: var(--accent-tint);
  border: var(--bw-hair) solid var(--accent);
  position: sticky; top: var(--space-2); z-index: 2;
}
.ds-bulk-count {
  font-weight: 600; font-size: var(--fs-sm); margin-right: auto;
}

/* Keyboard-shortcuts hint — compact two-column legend. */
.ds-shortcuts-hint {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 4px var(--space-3);
  padding: var(--space-3) var(--space-4);
  background: var(--bg-2); border: var(--bw-hair) solid var(--rule);
  border-radius: var(--r-2); font-size: var(--fs-xs);
}
.ds-shortcut-row { display: flex; align-items: center; gap: var(--space-2); }
.ds-kbd {
  display: inline-block; min-width: 0;
  padding: 2px 7px; border-radius: 6px;
  background: var(--bg); border: var(--bw-hair) solid var(--rule);
  border-bottom-width: 2px;
  font-family: var(--ff-mono); font-size: var(--fs-micro); color: var(--fg-2);
  white-space: nowrap;
}

/* ============================================================
   Theme toggle (segmented + compact) — bound to src/theme.js
   ============================================================ */
.ds-segmented {
  display: inline-flex; gap: 0; padding: 2px;
  background: var(--bg-2); border-radius: var(--r-pill);
  font-family: var(--ff-mono); font-size: var(--fs-xs);
}
.ds-segmented .ds-seg-btn {
  background: transparent; border: 0; color: var(--fg-3);
  padding: 4px 12px; border-radius: var(--r-pill); cursor: pointer;
  display: inline-flex; align-items: center; gap: 6px;
  transition: color var(--dur-base) var(--ease), background var(--dur-base) var(--ease);
}
.ds-segmented .ds-seg-btn:hover { color: var(--fg); }
.ds-segmented .ds-seg-btn.is-on {
  background: var(--bg); color: var(--fg);
  box-shadow: 0 1px 2px rgba(0,0,0,0.08);
}
.ds-theme-toggle.btn {
  font-family: var(--ff-mono); font-size: var(--fs-xs);
  display: inline-flex; align-items: center; gap: 6px;
}

/* ============================================================
   Chat kit polish — styles every class emitted by Chat /
   ChatMessage / ChatComposer / AICat. Before this block the
   chat-* classes had no CSS and rendered as unstyled paragraphs.
   ============================================================ */
.chat {
  display: flex; flex-direction: column;
  flex: 1; min-height: 0; gap: var(--space-3);
  padding-bottom: calc(var(--app-status-h, 42px) + var(--space-2));
}
.chat-head {
  display: flex; align-items: baseline; gap: 8px;
  padding: var(--space-3) 0 var(--space-2);
  font-family: var(--ff-mono); font-size: var(--fs-xs);
  color: var(--fg-3); text-transform: lowercase; letter-spacing: 0.02em;
  border-bottom: 1px solid color-mix(in oklab, var(--fg) 8%, transparent);
  margin-bottom: var(--space-2);
}
.chat-head .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--accent); flex-shrink: 0; }
.chat-head > span:nth-child(2) {
  font-family: var(--ff-body); font-size: var(--fs-h4);
  font-weight: 600; color: var(--fg);
  text-transform: none; letter-spacing: var(--tr-tight, -0.01em); line-height: 1.2;
}
.chat-head .sub { color: var(--fg-3); }
.chat-head .spread { flex: 1; }

.chat-thread {
  display: flex; flex-direction: column; gap: var(--space-3);
  flex: 1; min-height: 0; overflow-y: auto;
  padding: var(--space-2) 0;
  scrollbar-width: thin; scrollbar-color: var(--bg-3) transparent;
  scroll-behavior: smooth;
}
.chat-thread::-webkit-scrollbar { width: 8px; }
.chat-thread::-webkit-scrollbar-thumb { background: var(--bg-3); border-radius: 4px; }
.chat-thread:empty::before {
  content: 'no messages yet\astart the conversation';
  white-space: pre;
  color: var(--fg-3);
  font-family: var(--ff-mono);
  font-size: var(--fs-sm);
  text-align: center;
  margin: auto;
  opacity: 0.6;
  pointer-events: none;
}

.chat-msg { display: flex; gap: 12px; align-items: flex-start; padding: 6px 0; position: relative; min-width: 0; }
.chat-msg.you { flex-direction: row-reverse; }
.chat-msg.you .chat-stack { align-items: flex-end; }
.chat-msg:hover { background: color-mix(in oklab, var(--fg) 4%, transparent); padding: 6px 0; margin: 0; border-radius: 8px; transition: background var(--dur-base) var(--ease); }

.chat-avatar {
  width: 36px; height: 36px; flex-shrink: 0;
  border-radius: 50%; background: var(--bg-3); color: var(--fg);
  display: inline-flex; align-items: center; justify-content: center;
  font-family: var(--ff-mono); font-size: 12px; font-weight: 600;
  text-transform: lowercase; letter-spacing: 0.02em; user-select: none;
  transition: transform 0.12s ease, box-shadow 0.12s ease;
  position: relative;
}
.chat-msg:hover .chat-avatar { transform: scale(1.03); box-shadow: 0 1px 4px color-mix(in oklab, var(--fg) 6%, transparent); }
.chat-msg.you .chat-avatar {
  background: color-mix(in oklab, var(--accent) 26%, var(--bg-3));
  color: var(--accent);
}
.chat-msg.aicat .chat-avatar {
  background: color-mix(in oklab, var(--mascot) 26%, var(--bg-2));
  color: var(--mascot);
}

.chat-stack {
  display: flex; flex-direction: column; gap: 4px;
  max-width: min(70%, 56ch); min-width: 0;
  flex: 0 1 auto; overflow: hidden;
}

.chat-bubble {
  padding: 10px 14px; background: var(--bg-2); color: var(--fg);
  border-radius: 14px; line-height: 1.55;
  word-wrap: break-word; overflow-wrap: anywhere;
  font-size: var(--fs-sm);
  max-width: 100%;
  min-width: 0;
  transition: transform 0.12s ease, box-shadow 0.12s ease;
}
.chat-msg:hover .chat-bubble { transform: translateY(-1px); box-shadow: 0 2px 8px color-mix(in oklab, var(--fg) 6%, transparent); transition: transform var(--dur-base) var(--ease), box-shadow var(--dur-base) var(--ease); }
.chat-msg.you .chat-bubble { background: var(--accent); color: var(--accent-fg); }
.chat-msg.aicat .chat-bubble {
  background: color-mix(in oklab, var(--mascot) 14%, var(--bg-2));
  border: 1px solid color-mix(in oklab, var(--mascot) 28%, transparent);
}
.chat-bubble code {
  font-family: var(--ff-mono); font-size: 0.92em;
  background: color-mix(in oklab, var(--fg) 10%, transparent);
  padding: 1px 6px; border-radius: 4px;
}
.chat-msg.you .chat-bubble code { background: color-mix(in oklab, var(--accent-fg) 18%, transparent); }
.chat-bubble a {
  color: inherit; text-decoration: underline;
  text-underline-offset: 2px; text-decoration-thickness: 1px;
  text-decoration-color: color-mix(in oklab, currentColor 50%, transparent);
}
.chat-bubble a:hover { text-decoration-color: currentColor; }
.chat-bubble strong { font-weight: 700; }
.chat-bubble em { font-style: italic; }

.chat-bubble.chat-md { line-height: 1.6; }
.chat-bubble.chat-md > :first-child { margin-top: 0; }
.chat-bubble.chat-md > :last-child { margin-bottom: 0; }
.chat-bubble.chat-md h1,
.chat-bubble.chat-md h2,
.chat-bubble.chat-md h3,
.chat-bubble.chat-md h4 {
  font-family: var(--ff-body); font-weight: 600;
  margin: 12px 0 6px; line-height: 1.3;
}
.chat-bubble.chat-md h1 { font-size: 1.15em; }
.chat-bubble.chat-md h2 { font-size: 1.08em; }
.chat-bubble.chat-md h3 { font-size: 1.04em; }
.chat-bubble.chat-md p { margin: 6px 0; }
.chat-bubble.chat-md ul,
.chat-bubble.chat-md ol { margin: 6px 0; padding-left: 22px; }
.chat-bubble.chat-md li { margin: 3px 0; }
.chat-bubble.chat-md blockquote {
  margin: 8px 0; padding: 4px 12px;
  border-left: 3px solid color-mix(in oklab, currentColor 30%, transparent);
  color: color-mix(in oklab, currentColor 75%, transparent); font-style: italic;
}
.chat-bubble.chat-md pre {
  background: color-mix(in oklab, var(--fg) 8%, transparent);
  padding: 10px 12px; border-radius: 6px; overflow-x: auto;
  font-family: var(--ff-mono); font-size: 0.9em; margin: 8px 0;
}

.chat-msg .chat-bubble.chat-code,
.chat-msg.you .chat-bubble.chat-code,
.chat-bubble.chat-code {
  padding: 0; background: var(--bg);
  color: var(--fg);
  border: 1px solid color-mix(in oklab, var(--fg) 12%, transparent);
  overflow: hidden; max-width: 100%; min-width: 0;
}
.chat-bubble.chat-code pre,
.chat-bubble pre,
.chat-msg pre {
  max-width: 100%;
  overflow-x: auto;
  scrollbar-width: thin;
  scrollbar-color: var(--bg-3) transparent;
}
.chat-bubble pre code,
.chat-msg pre code {
  display: block;
  white-space: pre;
  min-width: 0;
}
.chat-code-head {
  display: flex; align-items: center; gap: 10px;
  padding: 8px 12px;
  background: color-mix(in oklab, var(--fg) 6%, var(--bg-2));
  border-bottom: 1px solid color-mix(in oklab, var(--fg) 12%, transparent);
  font-family: var(--ff-mono); font-size: var(--fs-xs); color: var(--fg-3);
}
.chat-code-head .lang { text-transform: uppercase; font-weight: 700; color: var(--accent); letter-spacing: 0.06em; }
.chat-code-head .filename,
.chat-code-head .name { color: var(--fg-2); font-weight: 500; }
.chat-code-head .spread { flex: 1; }
.chat-bubble.chat-code pre {
  margin: 0; padding: 12px 16px; background: transparent;
  font-family: var(--ff-mono); font-size: var(--fs-xs); line-height: 1.55;
  overflow-x: auto; color: var(--fg); border-radius: 0;
}
.chat-bubble.chat-code code { background: transparent; padding: 0; font-size: inherit; }
.chat-bubble.chat-code .token.keyword,
.chat-bubble.chat-code .token.atrule,
.chat-bubble.chat-code .token.selector { color: var(--accent); }
.chat-bubble.chat-code .token.string,
.chat-bubble.chat-code .token.attr-value { color: var(--mascot); }
.chat-bubble.chat-code .token.comment { color: var(--fg-3); font-style: italic; }
.chat-bubble.chat-code .token.number,
.chat-bubble.chat-code .token.boolean { color: var(--sun); }
.chat-bubble.chat-code .token.punctuation { color: var(--fg-2); }
.chat-bubble.chat-code .token.property,
.chat-bubble.chat-code .token.attr-name { color: var(--sky); }

.chat-msg.you .chat-image,
.chat-msg .chat-image,
.chat-image {
  display: inline-block; border-radius: 12px; overflow: hidden;
  max-width: min(100%, 480px); background: var(--bg-2);
  text-decoration: none; color: var(--fg);
  border: 1px solid color-mix(in oklab, var(--fg) 10%, transparent);
  transition: box-shadow 0.15s ease, border-color 0.15s ease;
}
.chat-msg:hover .chat-image,
.chat-image:hover {
  border-color: color-mix(in oklab, var(--accent) 35%, transparent);
  box-shadow: 0 4px 16px color-mix(in oklab, var(--fg) 12%, transparent);
}
.chat-image img { display: block; width: 100%; height: auto; max-height: 360px; object-fit: cover; }
.chat-image .cap,
.chat-image .caption { display: block; padding: 8px 12px; font-size: var(--fs-xs); color: var(--fg-3); font-family: var(--ff-mono); }

.chat-msg.you .chat-file,
.chat-msg .chat-file,
.chat-file {
  display: flex; align-items: center; gap: 12px; padding: 12px 14px;
  background: var(--bg-2); border: 1px solid color-mix(in oklab, var(--fg) 10%, transparent);
  border-radius: 12px; text-decoration: none; color: var(--fg);
  max-width: min(100%, 360px);
  transition: background var(--dur-snap, .15s) var(--ease, ease), border-color var(--dur-snap, .15s) var(--ease, ease);
}
.chat-file:hover { background: var(--bg-3); border-color: color-mix(in oklab, var(--accent) 40%, transparent); }
.chat-file .glyph {
  font-size: 22px; width: 36px; height: 36px;
  display: inline-flex; align-items: center; justify-content: center;
  background: color-mix(in oklab, var(--accent) 18%, transparent);
  color: var(--accent); border-radius: 8px; flex-shrink: 0; font-family: var(--ff-mono);
}
.chat-file > div { display: flex; flex-direction: column; gap: 2px; min-width: 0; }
.chat-file .name {
  font-weight: 600; font-size: var(--fs-sm);
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis; min-width: 0;
}
.chat-file .meta { display: flex; flex-direction: column; gap: 2px; min-width: 0; flex: 1; }
.chat-file .size { font-family: var(--ff-mono); font-size: var(--fs-xs); color: var(--fg-3); }
.chat-file .go { font-family: var(--ff-mono); font-size: 16px; color: var(--fg-3); flex-shrink: 0; }
.chat-file:hover .go { color: var(--accent); }

.chat-msg.you .chat-pdf,
.chat-msg .chat-pdf,
.chat-pdf {
  background: var(--bg-2);
  color: var(--fg);
  border: 1px solid color-mix(in oklab, var(--fg) 10%, transparent);
  border-radius: 12px; overflow: hidden; max-width: min(100%, 480px);
  transition: box-shadow 0.12s ease, border-color 0.12s ease;
}
.chat-msg:hover .chat-pdf { border-color: color-mix(in oklab, var(--accent) 30%, transparent); box-shadow: 0 2px 12px color-mix(in oklab, var(--fg) 6%, transparent); }
.chat-pdf-head {
  display: flex; align-items: center; gap: 10px; padding: 10px 14px;
  background: color-mix(in oklab, var(--fg) 5%, var(--bg-2));
  border-bottom: 1px solid color-mix(in oklab, var(--fg) 10%, transparent);
}
.chat-pdf-head .glyph { font-size: 18px; color: var(--mascot); flex-shrink: 0; }
.chat-pdf-head .name { flex: 1; font-weight: 600; font-size: var(--fs-sm); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.chat-pdf-head .size { font-family: var(--ff-mono); font-size: var(--fs-xs); color: var(--fg-3); }
.chat-pdf-head a { color: var(--accent); font-family: var(--ff-mono); font-size: var(--fs-xs); text-decoration: none; }
.chat-pdf embed,
.chat-pdf iframe,
.chat-pdf object { width: 100%; height: 360px; border: 0; display: block; }

.chat-msg.you .chat-link,
.chat-msg .chat-link,
.chat-link {
  display: grid; grid-template-columns: 80px 1fr; gap: 12px; padding: 10px;
  background: var(--bg-2);
  border: 1px solid color-mix(in oklab, var(--fg) 10%, transparent);
  border-radius: 12px; text-decoration: none; color: var(--fg);
  max-width: min(100%, 480px);
  transition: background var(--dur-snap, .15s) var(--ease, ease), border-color var(--dur-snap, .15s) var(--ease, ease), box-shadow 0.15s ease;
}
.chat-msg:hover .chat-link,
.chat-link:hover {
  background: var(--bg-3);
  border-color: color-mix(in oklab, var(--accent) 40%, transparent);
  box-shadow: 0 2px 12px color-mix(in oklab, var(--fg) 8%, transparent);
}
.chat-link:not(:has(.thumb)):not(:has(img)) { grid-template-columns: 1fr; }
.chat-link .thumb,
.chat-link img.thumb { width: 80px; height: 80px; border-radius: 8px; object-fit: cover; background: var(--bg-3) center/cover no-repeat; }
.chat-link .meta { display: flex; flex-direction: column; gap: 4px; min-width: 0; }
.chat-link .host { font-family: var(--ff-mono); font-size: var(--fs-xs); color: var(--fg-3); text-transform: lowercase; }
.chat-link .title { font-weight: 600; font-size: var(--fs-sm); line-height: 1.3; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.chat-link .desc { font-size: var(--fs-xs); color: var(--fg-2); line-height: 1.4; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }

.chat-meta {
  display: flex; align-items: center; gap: 6px;
  font-family: var(--ff-mono); font-size: var(--fs-xs); color: var(--fg-3);
  padding: 0 6px; letter-spacing: 0.02em;
}
.chat-meta .who { font-weight: 600; color: var(--fg-2); }
.chat-meta .who::after { content: ' ·'; color: var(--fg-3); font-weight: 400; }
.chat-meta .t { color: var(--fg-3); }
.chat-meta .tick { color: var(--fg-3); margin-left: 2px; letter-spacing: -2px; font-family: var(--ff-mono); }
.chat-meta .tick.read { color: var(--accent); }

.chat-reactions {
  display: flex; gap: 4px; flex-wrap: wrap; margin-top: 2px;
}
.chat-reactions .rxn {
  display: inline-flex; align-items: center; gap: 4px;
  padding: 2px 8px; background: var(--bg-2);
  border: 1px solid color-mix(in oklab, var(--fg) 10%, transparent);
  border-radius: 999px; font-size: var(--fs-xs);
  cursor: pointer; user-select: none;
  transition: background var(--dur-snap, .12s) var(--ease, ease), border-color var(--dur-snap, .12s) var(--ease, ease), transform 0.12s ease;
  position: relative;
}
.chat-reactions .rxn:hover { background: var(--bg-3); border-color: color-mix(in oklab, var(--accent) 40%, transparent); transform: scale(1.06); }
.chat-reactions .rxn.you {
  background: color-mix(in oklab, var(--accent) 18%, var(--bg-2));
  border-color: color-mix(in oklab, var(--accent) 55%, transparent);
  color: var(--accent);
}
.chat-reactions .rxn .e { font-size: 14px; line-height: 1; }
.chat-reactions .rxn .n { font-family: var(--ff-mono); font-weight: 600; font-size: 11px; color: var(--fg-2); }
.chat-reactions .rxn.you .n { color: var(--accent); }

.chat-typing { display: inline-flex; gap: 4px; align-items: center; }
.chat-typing span {
  width: 6px; height: 6px; border-radius: 50%; background: var(--fg-3);
}

@media (prefers-reduced-motion: no-preference) {
  .chat-typing span {
    animation: chat-typing-bounce 1.4s infinite ease-in-out;
  }
  .chat-typing span:nth-child(1) { animation-delay: 0s; }
  .chat-typing span:nth-child(2) { animation-delay: 0.18s; }
  .chat-typing span:nth-child(3) { animation-delay: 0.36s; }
  @keyframes chat-typing-bounce {
    0%, 60%, 100% { transform: translateY(0); opacity: 0.55; }
    30% { transform: translateY(-5px); opacity: 1; }
  }
}

@media (prefers-reduced-motion: no-preference) {
  @keyframes chat-fade-in {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: translateY(0); }
  }

  .chat-msg {
    animation: chat-fade-in 0.3s ease-out forwards;
  }
  .chat-msg:nth-child(1) { animation-delay: 0s; }
  .chat-msg:nth-child(2) { animation-delay: 0.05s; }
  .chat-msg:nth-child(3) { animation-delay: 0.1s; }
  .chat-msg:nth-child(n+4) { animation-delay: 0.15s; }
}

.chat-composer {
  display: flex; align-items: flex-end; gap: 8px;
  padding: var(--space-3) 0 0;
  border-top: 1px solid color-mix(in oklab, var(--fg) 8%, transparent);
  flex-shrink: 0;
}
.chat-composer textarea {
  flex: 1; padding: 12px 16px;
  background: var(--bg-2); color: var(--fg);
  border: 1px solid transparent; border-radius: var(--r-pill);
  font-family: inherit; font-size: var(--fs-sm);
  line-height: 1.4; resize: none;
  min-height: 44px; max-height: 200px;
}
.chat-composer textarea::placeholder { color: var(--fg-3); }
.chat-composer textarea:focus {
  background: var(--bg-2);
  border-color: var(--accent);
  box-shadow: 0 0 0 2px color-mix(in oklab, var(--accent) 20%, transparent);
  outline: none;
}
.chat-composer .send,
.chat-composer button {
  width: 44px; height: 44px; border-radius: 50%;
  background: var(--accent); color: var(--accent-fg);
  border: 0; cursor: pointer; font-size: 18px; font-weight: 700;
  display: inline-flex; align-items: center; justify-content: center;
  flex-shrink: 0; font-family: var(--ff-body);
  transition: background var(--dur-snap, .15s) var(--ease, ease), transform .1s ease;
  will-change: transform; contain: layout style paint;
}
.chat-composer .send:hover,
.chat-composer button:hover { transform: scale(1.04); }
.chat-composer .send:active,
.chat-composer button:active { transform: scale(0.96); }
.chat-composer .send:focus-visible,
.chat-composer button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}
.chat-composer .send:disabled,
.chat-composer button:disabled {
  background: var(--bg-3); color: var(--fg-3); cursor: not-allowed; transform: none;
}

.aicat-portrait { display: inline-flex; align-items: center; gap: 10px; padding: 4px 0; }
.aicat-face {
  width: 32px; height: 32px; font-size: 24px;
  display: inline-flex; align-items: center; justify-content: center;
  background: color-mix(in oklab, var(--mascot) 22%, var(--bg-2));
  border-radius: 50%; flex-shrink: 0;
}
.aicat-meta { display: flex; flex-direction: column; font-family: var(--ff-mono); font-size: var(--fs-xs); color: var(--fg-3); }
.aicat-meta .name { color: var(--mascot); font-weight: 600; }

/* ============================================================
   Sidebar polish: hide zero-count badges; tonal active state;
   monospace count chips.
   ============================================================ */
.app-side .count {
  background: color-mix(in oklab, var(--mascot) 92%, transparent);
  padding: 1px 8px; font-size: 10px; font-weight: 700;
  font-family: var(--ff-mono); letter-spacing: 0.04em;
  min-width: 18px; text-align: center;
}
.app-side a:has(> .count:empty) > .count,
.app-side .count:empty { display: none; }
.app-side a .glyph { font-family: var(--ff-mono); font-size: 13px; font-weight: 600; color: var(--fg-3); text-align: center; }
.app-side a.active .glyph { color: var(--accent); }

/* ── select primitive ─────────────────────────────────────────────────── */
.ds-select {
    width: 100%;
    padding: 10px 14px;
    background: var(--bg-2);
    border: 0;
    border-radius: var(--r-2);
    font-family: inherit;
    font-size: var(--fs-sm);
    color: var(--fg);
    appearance: none;
    background-image: linear-gradient(45deg, transparent 50%, var(--fg-3) 50%),
        linear-gradient(135deg, var(--fg-3) 50%, transparent 50%);
    background-position: calc(100% - 18px) 50%, calc(100% - 13px) 50%;
    background-size: 5px 5px, 5px 5px;
    background-repeat: no-repeat;
    cursor: pointer;
}
.ds-select:focus { box-shadow: inset 0 0 0 2px var(--accent); }
.ds-select:hover { background-color: var(--bg-3); }

/* ── chat composer autogrow polish ────────────────────────────────────── */
.chat-composer textarea {
    resize: none;
    overflow-y: auto;
    transition: height var(--dur-snap) var(--ease);
    line-height: 1.5;
}
.chat-composer textarea:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* ── mobile responsive: chat ──────────────────────────────────────────── */
@media (max-width: 768px) {
    .chat-stack { max-width: 100%; }
    .chat-msg { padding: 4px 0; }
    .chat-msg:hover { padding: 4px 0; margin: 0; border-radius: 0; background: transparent; }
    .chat-bubble { font-size: var(--fs-sm); padding: 10px 14px; }
    .chat-avatar { width: 28px; height: 28px; font-size: 12px; }
    .chat-composer { padding: 8px; }
    .chat-composer textarea { padding: 10px 12px; }
}

/* ── landscape orientation: reduce vertical space for composer ──────────── */
@media (max-height: 500px) and (orientation: landscape) {
    .chat-composer { padding: 6px 0; }
    .chat-composer textarea { min-height: 36px; max-height: 120px; }
    .chat-composer .send, .chat-composer button { width: 36px; height: 36px; font-size: 14px; }
}

/* ============================================================
   Enhanced UX: Component States, Drag-and-Drop, Context Menus
   Comprehensive improvements for perfect UX across all surfaces
   ============================================================ */

/* ────────────────────────────────────────────────────────────
   Component States — Disabled, Loading, Error, Success
   ────────────────────────────────────────────────────────────── */

/* Disabled state for all interactive elements */
.btn:disabled, .btn-primary:disabled, .btn-ghost:disabled,
button:disabled, [disabled] {
  opacity: 0.6;
  cursor: not-allowed;
  pointer-events: none;
}

/* Loading state — spinning indicator */
@keyframes spinner-rotate {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}
.loading { position: relative; }
.loading::after {
  content: '';
  position: absolute; top: 50%; right: 12px;
  width: 16px; height: 16px;
  border: 2px solid var(--bg-3);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spinner-rotate 0.8s linear infinite;
}

/* Error state */
.error, [data-state="error"],
.row.error, input.error,
textarea.error {
  border-color: var(--warn) !important;
  background-color: color-mix(in oklab, var(--warn) 6%, var(--bg));
}
.error::placeholder { color: color-mix(in oklab, var(--warn) 60%, var(--fg-3)); }

/* Success state */
.success, [data-state="success"],
.row.success { background-color: color-mix(in oklab, var(--green-2) 6%, var(--bg)); }

/* Readonly state */
[readonly], .readonly {
  background: var(--bg-2);
  cursor: default;
  opacity: 0.8;
}

/* ────────────────────────────────────────────────────────────
   Enhanced Button Micro-Interactions
   ────────────────────────────────────────────────────────────── */

/* Button scale feedback on active */
.btn:active:not(:disabled),
.btn-primary:active:not(:disabled),
.btn-ghost:active:not(:disabled),
button:active:not(:disabled) {
  transform: scale(0.98);
}

/* Enhanced hover transitions */
.btn, .btn-primary, .btn-ghost,
button, a.row, .row,
.chip, [role="button"],
input[type="checkbox"], input[type="radio"] {
  transition: all var(--dur-snap) var(--ease);
  will-change: background-color, color, transform;
}

/* Prevent double-tap zoom on buttons (iOS) */
.btn, .btn-primary, .btn-ghost, button {
  -webkit-user-select: none;
  -webkit-tap-highlight-color: transparent;
  -webkit-touch-callout: none;
}

/* ────────────────────────────────────────────────────────────
   Drag-and-Drop Styles
   ────────────────────────────────────────────────────────────── */

/* Draggable element */
[draggable="true"], .draggable {
  cursor: grab;
  user-select: none;
}
[draggable="true"]:active { cursor: grabbing; }

/* Drag-over state */
.drag-over {
  background: color-mix(in oklab, var(--accent) 12%, var(--bg));
  border: 2px dashed var(--accent);
  box-shadow: inset 0 0 0 1px var(--accent);
}

/* Drag-ghost (semi-transparent dragging element) */
.drag-ghost {
  opacity: 0.5;
  transform: rotate(2deg) scale(0.95);
}

/* Drop-zone indicator */
.drop-zone {
  border: 2px dashed var(--rule-strong);
  border-radius: var(--r-2);
  padding: var(--space-4);
  background: color-mix(in oklab, var(--accent) 4%, var(--bg));
  min-height: 120px;
  display: flex; align-items: center; justify-content: center;
  text-align: center; color: var(--fg-3);
  transition: all var(--dur-snap) var(--ease);
}
.drop-zone.active {
  border-color: var(--accent);
  background: color-mix(in oklab, var(--accent) 10%, var(--bg));
  color: var(--accent);
}

/* List item reorder indicator */
.list-item.dragging { opacity: 0.5; }
.list-item.drag-before::before,
.list-item.drag-after::after {
  content: '';
  position: absolute;
  left: 0; right: 0; height: 2px;
  background: var(--accent);
  animation: pulse-line 0.6s ease-in-out infinite;
}
.list-item.drag-before::before { top: -2px; }
.list-item.drag-after::after { bottom: -2px; }

@keyframes pulse-line {
  0%, 100% { opacity: 0.3; }
  50% { opacity: 1; }
}

/* ────────────────────────────────────────────────────────────
   Context Menu Styles
   ────────────────────────────────────────────────────────────── */

.ds-context-menu {
  position: absolute;
  background: var(--bg-2);
  border: 1px solid var(--rule);
  border-radius: var(--r-2);
  box-shadow: 0 10px 40px color-mix(in oklab, var(--fg) 20%, transparent);
  min-width: 160px;
  z-index: calc(var(--z-overlay, 1000) + 1);
  padding: 4px 0;
  animation: context-menu-in 0.15s ease-out;
}

@keyframes context-menu-in {
  from {
    opacity: 0;
    transform: scale(0.95) translateY(-4px);
  }
  to {
    opacity: 1;
    transform: scale(1) translateY(0);
  }
}

.ds-context-menu-item {
  display: flex; align-items: center; gap: 10px;
  padding: 10px 14px;
  cursor: pointer;
  color: var(--fg);
  font-size: var(--fs-sm);
  transition: background var(--dur-snap) var(--ease);
}
.ds-context-menu-item:hover {
  background: var(--bg-3);
  color: var(--accent);
}
.ds-context-menu-item:active {
  background: color-mix(in oklab, var(--accent) 20%, var(--bg-3));
}
.ds-context-menu-item.danger {
  color: var(--warn);
}
.ds-context-menu-item.danger:hover {
  background: color-mix(in oklab, var(--warn) 12%, var(--bg));
}
.ds-context-menu-divider {
  height: 1px;
  background: var(--rule);
  margin: 4px 0;
}
.ds-context-menu-icon {
  width: 16px; height: 16px;
  flex-shrink: 0;
  opacity: 0.7;
}

/* Context menu trigger indicator */
[data-has-context-menu] {
  cursor: context-menu;
}

/* ────────────────────────────────────────────────────────────
   Enhanced Form Inputs
   ────────────────────────────────────────────────────────────── */

input[type="text"],
input[type="email"],
input[type="password"],
input[type="number"],
textarea,
select {
  transition: background var(--dur-snap) var(--ease),
              border-color var(--dur-snap) var(--ease),
              box-shadow var(--dur-snap) var(--ease);
}

input[type="text"]::placeholder,
input[type="email"]::placeholder,
input[type="password"]::placeholder,
input[type="number"]::placeholder,
textarea::placeholder {
  color: var(--fg-3);
}

/* Clear button for text inputs */
input[type="text"]:not(:placeholder-shown) + .input-clear,
input[type="email"]:not(:placeholder-shown) + .input-clear,
input[type="password"]:not(:placeholder-shown) + .input-clear {
  display: inline-flex;
}

.input-clear {
  display: none;
  align-items: center; justify-content: center;
  width: 32px; height: 32px;
  cursor: pointer;
  color: var(--fg-3);
  background: transparent;
  border: 0;
  padding: 0;
  margin-right: 8px;
  border-radius: var(--r-1);
  transition: background var(--dur-snap) var(--ease), color var(--dur-snap) var(--ease);
}
.input-clear:hover {
  background: var(--bg-2);
  color: var(--fg);
}

/* ────────────────────────────────────────────────────────────
   Accessibility Enhancements
   ────────────────────────────────────────────────────────────── */

/* Enhanced focus-visible for all interactive elements */
[role="button"]:focus-visible,
[role="link"]:focus-visible,
[role="tab"]:focus-visible,
.row:focus-visible,
.row[tabindex]:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* Skip to main content link */
.skip-to-main {
  position: absolute; top: -40px; left: 0;
  background: var(--accent); color: var(--accent-fg);
  padding: 8px 16px; border-radius: var(--r-1);
  text-decoration: none; z-index: var(--z-overlay, 1000);
}
.skip-to-main:focus { top: 10px; }

/* Reduced motion preferences */
@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* ────────────────────────────────────────────────────────────
   Performance: GPU Acceleration & Paint Optimization
   ────────────────────────────────────────────────────────────── */

/* Promote hover-interactive elements to compositing layer */
.btn:hover, .btn-primary:hover, .btn-ghost:hover,
a:hover, .row:hover,
button:hover, [role="button"]:hover {
  transform: translateZ(0);
}

/* Contain layout repaints on self-contained components */
.panel, .row, .chip, .btn, button {
  contain: layout style paint;
}

/* ────────────────────────────────────────────────────────────
   Mobile Touch Optimizations
   ────────────────────────────────────────────────────────────── */

@media (hover: none) and (pointer: coarse) {
  /* Mobile devices: larger touch targets, faster responses */
  .btn, .btn-primary, .btn-ghost,
  button, a.row, [role="button"] {
    min-height: 48px;
    min-width: 48px;
    padding: 12px 20px;
  }

  /* Remove hover effects on touch devices (use active instead) */
  .btn:hover, .btn-primary:hover, .btn-ghost:hover {
    background-color: inherit;
  }

  /* Momentum scrolling for iOS */
  .app-side, .panel, .row {
    -webkit-overflow-scrolling: touch;
  }

  /* Long-press feedback for drag-enabled items */
  [draggable="true"], .draggable {
    -webkit-user-select: none;
    -webkit-touch-callout: none;
  }
}

/* ────────────────────────────────────────────────────────────
   Theme Transition Smoothness
   ────────────────────────────────────────────────────────────── */

html {
  transition: background-color var(--dur-base) var(--ease),
              color var(--dur-base) var(--ease);
}

body {
  transition: background-color var(--dur-base) var(--ease),
              color var(--dur-base) var(--ease);
}

/* ────────────────────────────────────────────────────────────
   Empty State & Loading States
   ────────────────────────────────────────────────────────────── */

.empty-state {
  display: flex; flex-direction: column; align-items: center; gap: var(--space-4);
  padding: var(--space-8) var(--space-4);
  text-align: center; color: var(--fg-3);
}
.empty-state-icon {
  font-size: 48px; opacity: 0.4;
}
.empty-state-title {
  font-size: var(--fs-lg); font-weight: 600; color: var(--fg-2);
}
.empty-state-body {
  font-size: var(--fs-sm); max-width: 40ch;
}

/* Skeleton loading state */
.skeleton {
  background: linear-gradient(
    90deg,
    var(--bg-2) 0%,
    var(--bg-3) 50%,
    var(--bg-2) 100%
  );
  background-size: 200% 100%;
  animation: skeleton-load 1.5s infinite;
  border-radius: var(--r-2);
}

@keyframes skeleton-load {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

.skeleton-line { height: 12px; margin-bottom: 12px; }
.skeleton-title { height: 24px; margin-bottom: 16px; width: 60%; }

/* ────────────────────────────────────────────────────────────
   Toast Notification Styles
   ────────────────────────────────────────────────────────────── */

.toast {
  position: fixed;
  bottom: 24px; right: 24px;
  background: var(--bg-2);
  border: 1px solid var(--rule);
  border-radius: var(--r-2);
  padding: var(--space-3) var(--space-4);
  max-width: 320px;
  box-shadow: 0 10px 40px color-mix(in oklab, var(--fg) 20%, transparent);
  animation: toast-slide-in 0.3s ease-out;
  z-index: calc(var(--z-overlay, 1000) + 10);
}

@keyframes toast-slide-in {
  from {
    opacity: 0;
    transform: translateX(400px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

.toast.error { border-color: var(--warn); }
.toast.success { border-color: var(--green-2); }
.toast.warning { border-color: var(--sun); }

@media (max-width: 480px) {
  .toast {
    bottom: 16px; right: 16px; left: 16px;
    max-width: none;
  }
}

/* ============================================================
   Spinner — animated loading indicator
   ============================================================ */
.ds-spinner {
  display: inline-flex;
  gap: 4px;
  align-items: center;
  height: 16px;
}
.ds-spinner span {
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--accent);
  animation: ds-bounce 1.4s infinite ease-in-out;
}
.ds-spinner span:nth-child(1) { animation-delay: 0s; }
.ds-spinner span:nth-child(2) { animation-delay: 0.18s; }
.ds-spinner span:nth-child(3) { animation-delay: 0.36s; }

.ds-spinner-lg { height: 24px; gap: 6px; }
.ds-spinner-lg span { width: 6px; height: 6px; }

.ds-spinner-sm { height: 12px; gap: 2px; }
.ds-spinner-sm span { width: 2px; height: 2px; }

@keyframes ds-bounce {
  0%, 80%, 100% { transform: translateY(0); }
  40% { transform: translateY(-8px); }
}

/* ============================================================
   Skeleton — animated loading placeholder
   ============================================================ */
.ds-skeleton-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}
.ds-skeleton {
  background: linear-gradient(90deg, var(--bg-2) 25%, var(--bg-3) 50%, var(--bg-2) 75%);
  background-size: 200% 100%;
  animation: ds-shimmer 1.5s infinite;
  border-radius: var(--r-1);
}

@keyframes ds-shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* ============================================================
   Alert — contextual message banner
   ============================================================ */
.ds-alert {
  display: flex;
  gap: var(--space-3);
  align-items: flex-start;
  padding: var(--space-3) var(--space-4);
  border-radius: var(--r-1);
  background: var(--panel-1);
  border: 1px solid var(--rule-strong);
  color: var(--fg);
}

.ds-alert-info { --alert-tone: var(--sky); }
.ds-alert-success { --alert-tone: var(--green); }
.ds-alert-warn { --alert-tone: var(--sun); }
.ds-alert-error { --alert-tone: var(--warn); }

.ds-alert-icon {
  flex-shrink: 0;
  color: var(--alert-tone);
  font-weight: 600;
  min-width: 20px;
  text-align: center;
}

.ds-alert-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.ds-alert-title {
  font-weight: 500;
  font-size: var(--fs-sm);
}

.ds-alert-message {
  font-size: var(--fs-sm);
  color: var(--fg-2);
}

.ds-alert-dismiss {
  flex-shrink: 0;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--fg-3);
  padding: 0;
  font-size: 14px;
  line-height: 1;
  min-width: 20px;
  text-align: center;
  transition: color var(--dur-snap) var(--ease);
}
.ds-alert-dismiss:hover { color: var(--fg); }

/* ============================================================
   Responsive Perfection — Drawer rail, ultrawide cap, mobile compact
   ============================================================ */

/* Tablet + Mobile: side rail becomes off-canvas drawer (≤900px) */
@media (max-width: 900px) {
  .app-body,
  .app-body.no-side { grid-template-columns: 1fr !important; }
  .app-side-shell {
    position: fixed;
    left: 0; top: var(--app-topbar-h);
    height: calc(100vh - var(--app-topbar-h) - var(--app-status-h));
    width: 280px; max-width: 80vw;
    transform: translateX(-100%);
    transition: transform var(--dur-base, 240ms) var(--ease, ease);
    z-index: 50;
    background: var(--bg);
    border-right: 1px solid color-mix(in oklab, var(--fg) 8%, transparent);
    overflow-y: auto;
  }
  .app-side-shell.open,
  .app-side.open,
  .app-body.side-open .app-side-shell { transform: translateX(0); }
  .app-side {
    flex-direction: column !important;
    flex-wrap: nowrap !important;
    gap: var(--space-2);
    padding: var(--space-3);
    font-size: var(--fs-sm);
  }
  .app-side a {
    flex: 0 0 auto; min-width: 0;
    grid-template-columns: 18px 1fr auto;
    padding: 10px 12px;
  }
  .app-side .group { width: 100%; }
  .app-crumb { display: none; }
  .chat-head { padding: var(--space-2) var(--space-3) var(--space-2); margin-bottom: var(--space-2); }
  .app-main { padding-left: var(--space-3); padding-right: var(--space-3); }
}

/* Drawer scrim */
.app-side-scrim {
  display: none;
  position: fixed; inset: 0;
  background: color-mix(in oklab, var(--bg) 60%, transparent);
  z-index: 49;
}
@media (max-width: 900px) {
  .app-body.side-open ~ .app-side-scrim,
  .app-side-shell.open ~ .app-side-scrim { display: block; }
}

/* Mobile (≤480) status bar compact; hide tail item */
@media (max-width: 480px) {
  .app-status {
    font-size: var(--fs-micro);
    padding: 4px var(--space-2);
    gap: var(--space-2);
  }
  .app-status > :last-child:not(:only-child) { display: none; }
}

/* Tiny phone (≤360) topbar compact */
@media (max-width: 360px) {
  .app-topbar {
    padding: 8px var(--space-2);
    font-size: var(--fs-xs);
    gap: var(--space-2);
  }
  .app-topbar nav,
  .app-topbar > :last-child { display: none; }
  .brand { font-size: var(--fs-tiny); }
}