/* ============================================================
   App shell — IDE-modern density patterns
   Consumed by landing, ui_kits/*, docs, blog, slides
   Light default · dark via prefers-color-scheme or [data-theme=dark]
   ============================================================ */

html, body {
    background: var(--panel-0);
    color: var(--panel-text);
    font-family: 'Inter', 'Segoe UI', -apple-system, BlinkMacSystemFont, system-ui, sans-serif;
    font-size: 13px;
    line-height: 1.5;
}

.app {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    background: var(--panel-0);
}

/* Top bar — sticky chrome, elevated via shadow so content doesn't bleed under */
.app-topbar {
    position: sticky;
    top: 0;
    z-index: 100;
    height: 40px;
    background: var(--panel-2);
    color: var(--panel-text);
    display: flex;
    align-items: center;
    padding: 0 16px;
    gap: 16px;
    font-size: 13px;
    flex-shrink: 0;
}
.app-topbar .brand {
    font-weight: 600;
    color: var(--panel-text);
    display: inline-flex;
    align-items: center;
}
.app-topbar .brand .slash { color: var(--panel-text-3); margin: 0 6px; font-weight: 400; }
.app-topbar nav {
    display: flex;
    gap: 2px;
    margin-left: auto;
    align-items: center;
}
.app-topbar nav a {
    color: var(--panel-text-2);
    text-decoration: none;
    padding: 7px 12px;
    font-size: 13px;
    border-radius: 6px;
    line-height: 1;
}
.app-topbar nav a:hover { background: var(--panel-hover); color: var(--panel-text); }
.app-topbar nav a.active { color: #ffffff; background: var(--panel-accent); }

/* Breadcrumb — under topbar */
.app-crumb {
    position: sticky;
    top: 40px;
    z-index: 99;
    background: var(--panel-1);
    padding: 8px 20px;
    font-family: var(--ff-mono);
    font-size: 12px;
    color: var(--panel-text-2);
    display: flex;
    gap: 6px;
    align-items: center;
    flex-shrink: 0;
}
.app-crumb .sep { color: var(--panel-text-3); }
.app-crumb .leaf { color: var(--panel-text); }

/* Shell body — optional sidebar + main */
.app-body {
    display: grid;
    grid-template-columns: 240px 1fr;
    flex: 1;
    min-height: 0;
    background: var(--panel-0);
}
.app-body.no-side { grid-template-columns: 1fr; }

/* Sidebar */
.app-side {
    background: var(--panel-1);
    padding: 12px 0;
    overflow-y: auto;
}
.app-side .group {
    padding: 12px 16px 4px 16px;
    font-family: var(--ff-mono);
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--panel-text-2);
    font-weight: 600;
}
.app-side a {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 5px 16px 5px 24px;
    color: var(--panel-text);
    text-decoration: none;
    font-size: 13px;
}
.app-side a:hover { background: var(--panel-hover); }
.app-side a.active { background: var(--panel-select); color: var(--panel-text); font-weight: 500; }
.app-side a .glyph { color: var(--panel-text-2); font-family: var(--ff-mono); width: 14px; flex-shrink: 0; }
.app-side a.active .glyph { color: var(--panel-accent); }

/* Main content area */
.app-main {
    background: var(--panel-0);
    padding: 24px 32px 64px 32px;
    overflow-y: auto;
}
.app-main.narrow { max-width: 820px; }
.app-main.centered { margin: 0 auto; }

.app-main h1 {
    font-size: 28px;
    font-weight: 600;
    margin: 4px 0 4px 0;
    color: var(--panel-text);
    letter-spacing: -0.01em;
    line-height: 1.2;
}
.app-main h2 {
    font-size: 18px;
    font-weight: 600;
    margin: 32px 0 8px 0;
    color: var(--panel-text);
    letter-spacing: -0.005em;
}
.app-main h3 {
    font-family: var(--ff-mono);
    font-size: 12px;
    font-weight: 600;
    margin: 24px 0 8px 0;
    color: var(--panel-accent);
    text-transform: uppercase;
    letter-spacing: 0.08em;
}
.app-main p {
    margin: 0 0 12px 0;
    max-width: 72ch;
    font-size: 14px;
    line-height: 1.6;
    color: var(--panel-text);
}
.app-main .lede {
    font-size: 15px;
    color: var(--panel-text-2);
    margin: 0 0 24px 0;
    max-width: 60ch;
}
.app-main a {
    color: var(--panel-accent);
    text-decoration: none;
}
.app-main a:hover { text-decoration: underline; text-underline-offset: 2px; }
.app-main code {
    font-family: var(--ff-mono);
    font-size: 12px;
    background: var(--panel-1);
    padding: 1px 6px;
    border-radius: 6px;
    color: var(--panel-text);
    box-shadow: var(--panel-shadow);
}
.app-main pre {
    background: var(--panel-1);
    padding: 14px 16px;
    font-family: var(--ff-mono);
    font-size: 12px;
    line-height: 1.6;
    color: var(--panel-text);
    overflow-x: auto;
    margin: 12px 0;
    border-radius: 8px;
    box-shadow: var(--panel-shadow);
}
.app-main pre code { background: transparent; padding: 0; box-shadow: none; }
.app-main pre .c { color: var(--panel-text-2); }
.app-main pre .k { color: var(--panel-accent); }
.app-main pre .s { color: #ce9178; }

/* Panel — grouped content block, elevated */
.panel {
    background: var(--panel-1);
    border-radius: 8px;
    overflow: hidden;
    margin: 12px 0;
    box-shadow: var(--panel-shadow);
}
.panel-head {
    padding: 10px 16px;
    background: var(--panel-2);
    font-family: var(--ff-mono);
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--panel-text-2);
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
}
.panel-body { padding: 0; background: var(--panel-1); }

/* Row — dense list item */
.row {
    display: grid;
    grid-template-columns: 80px 1fr auto;
    gap: 12px;
    padding: 8px 16px;
    align-items: baseline;
    color: var(--panel-text);
    text-decoration: none;
    font-size: 13px;
    cursor: pointer;
    background: transparent;
}
.row:hover { background: var(--panel-hover); }
.row.active { background: var(--panel-select); }
.row .code {
    font-family: var(--ff-mono);
    font-size: 11px;
    color: var(--panel-text-2);
    letter-spacing: 0.04em;
}
.row .title { color: var(--panel-text); font-weight: 500; }
.row .sub { color: var(--panel-text-2); font-size: 12px; margin-left: 8px; font-weight: 400; }
.row .meta { color: var(--panel-text-2); font-size: 11px; text-align: right; font-family: var(--ff-mono); }

/* CLI install block */
.cli {
    display: flex;
    align-items: stretch;
    background: var(--panel-1);
    border-radius: 8px;
    overflow: hidden;
    font-family: var(--ff-mono);
    font-size: 13px;
    max-width: 640px;
    margin: 12px 0;
    box-shadow: var(--panel-shadow);
}
.cli .prompt { padding: 10px 14px; color: var(--panel-accent); font-weight: 600; }
.cli .cmd { flex: 1; padding: 10px 0; color: var(--panel-text); }
.cli .copy {
    padding: 0 16px;
    background: var(--panel-2);
    color: var(--panel-text-2);
    cursor: pointer;
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    display: flex;
    align-items: center;
}
.cli .copy:hover { background: var(--panel-3); color: var(--panel-text); }

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 7px 14px;
    background: var(--panel-2);
    color: var(--panel-text);
    font-family: inherit;
    font-size: 13px;
    font-weight: 500;
    border-radius: 6px;
    cursor: pointer;
    text-decoration: none;
    transition: background 80ms ease;
    box-shadow: var(--panel-shadow);
}
.btn:hover { background: var(--panel-3); }
.btn:active { background: var(--panel-hover); }

.btn-primary {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 7px 14px;
    background: var(--panel-accent);
    color: #ffffff;
    font-family: inherit;
    font-size: 13px;
    font-weight: 500;
    border-radius: 6px;
    cursor: pointer;
    text-decoration: none;
    transition: filter 80ms ease;
    box-shadow: var(--panel-shadow);
}
.btn-primary:hover { filter: brightness(1.08); }
.btn-primary:active { filter: brightness(0.94); }

.btn-ghost {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 7px 14px;
    background: transparent;
    color: var(--panel-text-2);
    font-family: inherit;
    font-size: 13px;
    cursor: pointer;
    text-decoration: none;
    border-radius: 6px;
    transition: background 80ms ease;
}
.btn-ghost:hover { background: var(--panel-hover); color: var(--panel-text); }

/* Tag / chip */
.chip {
    display: inline-flex;
    align-items: center;
    padding: 2px 8px;
    border-radius: 6px;
    font-family: var(--ff-mono);
    font-size: 11px;
    font-weight: 500;
    background: var(--panel-2);
    color: var(--panel-text);
}
.chip.accent { background: var(--panel-accent); color: #ffffff; }
.chip.dim { color: var(--panel-text-2); background: var(--panel-1); }

/* Status bar — accent-colored footer */
.app-status {
    height: 24px;
    background: var(--panel-accent);
    color: #ffffff;
    display: flex;
    align-items: center;
    padding: 0 14px;
    gap: 14px;
    font-family: var(--ff-mono);
    font-size: 11px;
    flex-shrink: 0;
}
.app-status .spread { flex: 1; }
.app-status .item { display: flex; align-items: center; gap: 4px; }
.app-status a { color: #ffffff; text-decoration: none; }

/* Key-value table */
.kv {
    width: 100%;
    max-width: 640px;
    background: var(--panel-1);
    border-radius: 8px;
    overflow: hidden;
    border-collapse: collapse;
    box-shadow: var(--panel-shadow);
    margin: 12px 0;
}
.kv td { padding: 8px 16px; font-size: 13px; }
.kv tr:nth-child(even) { background: var(--panel-2); }
.kv td:first-child {
    color: var(--panel-text-2);
    font-family: var(--ff-mono);
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    width: 160px;
}
.kv td:last-child { color: var(--panel-text); }

/* Card grid — landing index */
.cards {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 8px;
    margin: 12px 0 24px 0;
}
.card-item {
    display: grid;
    grid-template-columns: 44px 1fr;
    gap: 10px;
    padding: 14px 16px;
    background: var(--panel-1);
    color: var(--panel-text);
    text-decoration: none;
    align-items: baseline;
    border-radius: 8px;
    box-shadow: var(--panel-shadow);
    transition: background 80ms ease, transform 80ms ease;
}
.card-item:hover { background: var(--panel-hover); transform: translateY(-1px); }
.card-item .code {
    font-family: var(--ff-mono);
    font-size: 11px;
    color: var(--panel-accent);
    letter-spacing: 0.04em;
    font-weight: 600;
}
.card-item .name {
    font-size: 13px;
    font-weight: 500;
    color: var(--panel-text);
}

/* Scrollbars */
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-thumb { background: var(--panel-3); border-radius: 5px; }
::-webkit-scrollbar-thumb:hover { background: var(--panel-hover); }
::-webkit-scrollbar-track { background: transparent; }