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/* ==========================================================================
   SVD Linear Attention Research Hub — Complete Design System
   ========================================================================== */

/* ── Design Tokens ──────────────────────────────────────────────────────── */
:root {
    /* Core Palette */
    --bg-base:        #080a12;
    --bg-sidebar:     #0c0f1a;
    --bg-surface:     #111524;
    --bg-elevated:    #161b2e;
    --bg-hover:       #1c2237;
    --bg-active:      #1e2640;
    --bg-glass:       rgba(11,14,25,0.88);

    /* Text */
    --tx-primary:     #eef2ff;
    --tx-secondary:   #a8b4d0;
    --tx-muted:       #6b7a99;
    --tx-faint:       #424d6a;
    --tx-accent:      #60a5fa;
    --tx-on-accent:   #fff;

    /* Accent system */
    --accent:         #3b82f6;
    --accent-hover:   #60a5fa;
    --accent-glow:    rgba(59,130,246,0.18);
    --accent-2:       #06b6d4;   /* cyan */
    --accent-3:       #10b981;   /* emerald */
    --accent-4:       #f59e0b;   /* amber */
    --accent-5:       #f43f5e;   /* rose */

    /* Borders */
    --bd-subtle:      rgba(255,255,255,0.07);
    --bd-medium:      rgba(255,255,255,0.12);
    --bd-accent:      rgba(59,130,246,0.4);

    /* Typography */
    --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', ui-monospace, monospace;

    /* Layout */
    --sidebar-w:    300px;
    --topbar-h:     58px;
    --toc-w:        220px;

    /* Motion */
    --ease-out:     cubic-bezier(0.16,1,0.3,1);
    --ease-in-out:  cubic-bezier(0.4,0,0.2,1);
    --dur-fast:     140ms;
    --dur-med:      240ms;
    --dur-slow:     380ms;
}

/* Light theme overrides */
[data-theme="light"] {
    --bg-base:        #f5f7fc;
    --bg-sidebar:     #eef0f8;
    --bg-surface:     #fff;
    --bg-elevated:    #f8faff;
    --bg-hover:       #edf0fa;
    --bg-active:      #e4eafb;
    --bg-glass:       rgba(245,247,252,0.92);
    --tx-primary:     #0f1529;
    --tx-secondary:   #3a4466;
    --tx-muted:       #6e7ea8;
    --tx-faint:       #a0aec0;
    --tx-accent:      #2563eb;
    --bd-subtle:      rgba(0,0,0,0.07);
    --bd-medium:      rgba(0,0,0,0.12);
}

/* ── Reset ──────────────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
    font-size: 15px;
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
}

body {
    background: var(--bg-base);
    color: var(--tx-secondary);
    font-family: var(--font-sans);
    line-height: 1.7;
    overflow: hidden;
    height: 100vh;
}

a { color: var(--accent-hover); text-decoration: none; }
a:hover { text-decoration: underline; }
button { cursor: pointer; border: none; background: none; font: inherit; }

/* ── Scrollbars ─────────────────────────────────────────────────────────── */
::-webkit-scrollbar { width: 5px; height: 5px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.12); border-radius: 10px; }
::-webkit-scrollbar-thumb:hover { background: rgba(255,255,255,0.22); }
[data-theme="light"] ::-webkit-scrollbar-thumb { background: rgba(0,0,0,0.14); }

/* ── Reading Progress Bar ───────────────────────────────────────────────── */
#reading-progress-bar {
    position: fixed; top: 0; left: 0; right: 0;
    height: 2px; z-index: 9999;
    background: linear-gradient(90deg, var(--accent) 0%, var(--accent-2) 100%);
    width: 0%;
    transition: width 80ms linear;
    transform-origin: left;
}

/* ══════════════════════════════════════════════════════════════════════════
   COMMAND PALETTE
══════════════════════════════════════════════════════════════════════════ */
.cmd-overlay {
    position: fixed; inset: 0; z-index: 8000;
    display: flex; align-items: flex-start; justify-content: center;
    padding-top: 12vh;
}
.cmd-overlay.hidden { display: none; }

.cmd-backdrop {
    position: absolute; inset: 0;
    background: rgba(5,7,16,0.72);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

.cmd-panel {
    position: relative; z-index: 1;
    width: min(680px, calc(100vw - 32px));
    background: var(--bg-elevated);
    border: 1px solid var(--bd-medium);
    border-radius: 16px;
    overflow: hidden;
    box-shadow:
        0 0 0 1px rgba(255,255,255,0.04) inset,
        0 24px 80px rgba(0,0,0,0.6),
        0 8px 24px rgba(0,0,0,0.4);
    animation: cmdSlideIn var(--dur-fast) var(--ease-out) both;
}
@keyframes cmdSlideIn {
    from { opacity: 0; transform: scale(.97) translateY(-8px); }
    to   { opacity: 1; transform: none; }
}

.cmd-search-row {
    display: flex; align-items: center; gap: 12px;
    padding: 16px 20px;
    border-bottom: 1px solid var(--bd-subtle);
}
.cmd-mag { color: var(--tx-muted); flex-shrink: 0; }
#cmd-input {
    flex: 1; background: none; border: none; outline: none;
    color: var(--tx-primary); font-size: 1.05rem; font-family: var(--font-sans);
}
#cmd-input::placeholder { color: var(--tx-faint); }

.cmd-esc-kbd {
    font-size: .65rem; color: var(--tx-muted);
    background: var(--bg-surface); border: 1px solid var(--bd-subtle);
    border-radius: 5px; padding: 2px 6px;
    font-family: var(--font-mono); white-space: nowrap;
}

.cmd-categories {
    display: flex; gap: 4px; padding: 8px 16px;
    border-bottom: 1px solid var(--bd-subtle);
}
.cmd-cat {
    font-size: .72rem; font-weight: 500;
    color: var(--tx-muted); padding: 3px 10px;
    border-radius: 20px; transition: all var(--dur-fast);
    letter-spacing: .02em;
}
.cmd-cat:hover { background: var(--bg-hover); color: var(--tx-primary); }
.cmd-cat.active { background: var(--accent-glow); color: var(--tx-accent); }

.cmd-results {
    max-height: 380px; overflow-y: auto; padding: 8px 0;
}

.cmd-group-label {
    font-size: .68rem; font-weight: 600; letter-spacing: .08em;
    text-transform: uppercase; color: var(--tx-faint);
    padding: 8px 20px 4px;
}

.cmd-item {
    display: flex; align-items: center; gap: 12px;
    padding: 9px 20px;
    cursor: pointer; transition: background var(--dur-fast);
}
.cmd-item:hover, .cmd-item.selected {
    background: var(--bg-hover);
}
.cmd-item.selected { background: var(--accent-glow); }
.cmd-item-icon {
    width: 30px; height: 30px; border-radius: 8px;
    display: flex; align-items: center; justify-content: center;
    font-size: .75rem; font-weight: 600; flex-shrink: 0;
}
.cmd-item-icon.attn { background: rgba(59,130,246,.15); color: var(--accent); }
.cmd-item-icon.comp { background: rgba(6,182,212,.15); color: var(--accent-2); }
.cmd-item-icon.fw { background: rgba(16,185,129,.15); color: var(--accent-3); }

.cmd-item-info { flex: 1; min-width: 0; }
.cmd-item-title {
    font-size: .85rem; font-weight: 500; color: var(--tx-primary);
    white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.cmd-item-sub { font-size: .72rem; color: var(--tx-muted); }
.cmd-item-badge {
    font-size: .65rem; padding: 2px 7px; border-radius: 20px;
    font-weight: 500; white-space: nowrap; flex-shrink: 0;
}
.cmd-item-badge.attn { background: rgba(59,130,246,.12); color: var(--accent); }
.cmd-item-badge.comp { background: rgba(6,182,212,.12); color: var(--accent-2); }
.cmd-item-badge.fw   { background: rgba(16,185,129,.12); color: var(--accent-3); }

.cmd-no-results {
    text-align: center; padding: 36px 20px;
    color: var(--tx-muted); font-size: .88rem;
}

.cmd-footer-bar {
    display: flex; gap: 16px; align-items: center;
    padding: 9px 20px;
    border-top: 1px solid var(--bd-subtle);
    font-size: .7rem; color: var(--tx-faint);
}
.cmd-footer-bar kbd {
    font-family: var(--font-mono); font-size: .65rem;
    background: var(--bg-surface); border: 1px solid var(--bd-subtle);
    border-radius: 4px; padding: 1px 5px; margin-right: 3px;
    color: var(--tx-muted);
}

/* ══════════════════════════════════════════════════════════════════════════
   APP SHELL
══════════════════════════════════════════════════════════════════════════ */
#app-container {
    display: flex; height: 100vh; overflow: hidden;
}

/* ══════════════════════════════════════════════════════════════════════════
   SIDEBAR
══════════════════════════════════════════════════════════════════════════ */
#sidebar {
    width: var(--sidebar-w);
    min-width: var(--sidebar-w);
    max-width: var(--sidebar-w);
    background: var(--bg-sidebar);
    border-right: 1px solid var(--bd-subtle);
    display: flex; flex-direction: column;
    height: 100vh; overflow: hidden;
    transition: width var(--dur-med) var(--ease-out),
                min-width var(--dur-med) var(--ease-out),
                transform var(--dur-med) var(--ease-out);
    position: relative; z-index: 200;
    flex-shrink: 0;
}
#sidebar.collapsed {
    width: 0; min-width: 0; overflow: hidden;
}

/* Sidebar Header */
.sidebar-header {
    display: flex; align-items: center; justify-content: space-between;
    padding: 16px 16px 12px;
    border-bottom: 1px solid var(--bd-subtle);
    flex-shrink: 0;
}
.brand-wrap {
    display: flex; align-items: center; gap: 10px;
}
.brand-icon {
    width: 36px; height: 36px; border-radius: 10px;
    background: linear-gradient(135deg, var(--accent) 0%, var(--accent-2) 100%);
    display: flex; align-items: center; justify-content: center;
    color: #fff; flex-shrink: 0;
}
.brand-name {
    font-size: .85rem; font-weight: 700; color: var(--tx-primary);
    letter-spacing: -.01em; line-height: 1.2;
}
.brand-version {
    font-size: .65rem; color: var(--tx-muted); margin-top: 1px;
}

.collapse-btn {
    color: var(--tx-faint); padding: 4px;
    border-radius: 6px; transition: all var(--dur-fast);
}
.collapse-btn:hover { background: var(--bg-hover); color: var(--tx-secondary); }

/* Sidebar Search */
.sidebar-search-wrap { padding: 10px 12px; flex-shrink: 0; }
.sidebar-search-btn {
    width: 100%; display: flex; align-items: center; gap: 8px;
    padding: 8px 12px;
    background: var(--bg-surface); border: 1px solid var(--bd-subtle);
    border-radius: 8px; color: var(--tx-muted);
    font-size: .78rem; text-align: left;
    transition: all var(--dur-fast); cursor: pointer;
}
.sidebar-search-btn:hover {
    border-color: var(--bd-medium); background: var(--bg-elevated);
    color: var(--tx-secondary);
}
.sidebar-search-btn span { flex: 1; }
.sidebar-search-btn kbd, #search-shortcut-hint {
    font-size: .62rem; font-family: var(--font-mono);
    background: var(--bg-base); border: 1px solid var(--bd-subtle);
    border-radius: 4px; padding: 1px 5px; color: var(--tx-faint);
    flex-shrink: 0;
}

/* Stats Row */
.sidebar-stats-row {
    display: flex; align-items: center; gap: 0;
    margin: 0 12px 10px;
    background: var(--bg-surface); border: 1px solid var(--bd-subtle);
    border-radius: 10px; overflow: hidden;
    flex-shrink: 0;
}
.stat-chip {
    flex: 1; display: flex; flex-direction: column; align-items: center;
    padding: 10px 8px; cursor: pointer;
    transition: background var(--dur-fast);
}
.stat-chip:hover { background: var(--bg-hover); }
.stat-n {
    font-size: 1.2rem; font-weight: 700; color: var(--tx-primary);
    line-height: 1; font-variant-numeric: tabular-nums;
}
.stat-l { font-size: .62rem; color: var(--tx-muted); margin-top: 2px; font-weight: 500; }
.stat-divider { width: 1px; background: var(--bd-subtle); align-self: stretch; margin: 6px 0; }

/* Filter Chips */
.filter-chips-row {
    display: flex; gap: 4px; padding: 0 12px 10px;
    flex-wrap: wrap; flex-shrink: 0;
}
.fchip {
    font-size: .68rem; font-weight: 600; letter-spacing: .03em;
    padding: 4px 10px; border-radius: 20px;
    color: var(--tx-muted); transition: all var(--dur-fast);
    border: 1px solid transparent;
}
.fchip:hover { background: var(--bg-hover); color: var(--tx-secondary); }
.fchip.active {
    background: var(--accent-glow); color: var(--tx-accent);
    border-color: rgba(59,130,246,.25);
}

/* Navigation Tree */
.sidebar-nav {
    flex: 1; overflow-y: auto; padding: 4px 8px 8px;
    overscroll-behavior: contain;
}
.nav-skeleton { padding: 8px 4px; }
.sk-group-label {
    height: 10px; width: 42%; background: var(--bg-elevated);
    border-radius: 5px; margin-bottom: 8px;
    animation: pulse 1.4s ease-in-out infinite;
}
.sk-item {
    height: 32px; background: var(--bg-elevated); border-radius: 6px;
    margin-bottom: 4px;
    animation: pulse 1.4s ease-in-out infinite;
}
.sk-item:nth-child(2) { animation-delay: .1s; }
.sk-item:nth-child(3) { animation-delay: .2s; }
@keyframes pulse {
    0%,100% { opacity: .4; }
    50%      { opacity: .75; }
}

.nav-section { margin-bottom: 4px; }
.nav-section-header {
    display: flex; align-items: center; justify-content: space-between;
    padding: 6px 8px; margin-bottom: 2px;
    cursor: pointer; border-radius: 6px;
    transition: background var(--dur-fast);
    user-select: none;
}
.nav-section-header:hover { background: var(--bg-hover); }
.nav-section-title {
    font-size: .65rem; font-weight: 700; letter-spacing: .08em;
    text-transform: uppercase; color: var(--tx-faint);
    display: flex; align-items: center; gap: 6px;
}
.nav-section-badge {
    background: var(--bg-elevated); color: var(--tx-muted);
    font-size: .58rem; font-weight: 600; padding: 1px 6px;
    border-radius: 10px; border: 1px solid var(--bd-subtle);
}
.nav-section-chevron {
    color: var(--tx-faint); transition: transform var(--dur-fast);
}
.nav-section.collapsed .nav-section-chevron { transform: rotate(-90deg); }
.nav-section-items { overflow: hidden; }
.nav-section.collapsed .nav-section-items { display: none; }

.nav-item {
    display: flex; align-items: center; gap: 8px;
    padding: 6px 10px 6px 8px; border-radius: 7px;
    cursor: pointer; transition: all var(--dur-fast);
    position: relative; margin-bottom: 1px;
    text-decoration: none; color: var(--tx-secondary); font-size: .8rem;
}
.nav-item:hover {
    background: var(--bg-hover); color: var(--tx-primary);
    text-decoration: none;
}
.nav-item.active {
    background: var(--accent-glow); color: var(--tx-accent);
    font-weight: 500;
}
.nav-item.active::before {
    content: ''; position: absolute; left: 0; top: 25%; bottom: 25%;
    width: 2.5px; background: var(--accent); border-radius: 0 2px 2px 0;
}
.nav-item-icon {
    font-size: .7rem; width: 18px; text-align: center;
    flex-shrink: 0; opacity: .6;
}
.nav-item.active .nav-item-icon { opacity: 1; }
.nav-item-text { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.nav-item-tag {
    font-size: .58rem; font-weight: 600; padding: 1px 5px;
    border-radius: 4px; flex-shrink: 0;
}
.tag-svd { background: rgba(59,130,246,.12); color: var(--accent); }
.tag-ssm { background: rgba(6,182,212,.12); color: var(--accent-2); }
.tag-moe { background: rgba(245,158,11,.12); color: var(--accent-4); }

/* Sidebar Footer */
.sidebar-footer {
    display: flex; align-items: center; gap: 6px;
    padding: 10px 12px;
    border-top: 1px solid var(--bd-subtle);
    flex-shrink: 0;
}
.sf-btn {
    flex: 1; display: flex; align-items: center; justify-content: center; gap: 6px;
    padding: 6px 8px; border-radius: 7px;
    font-size: .72rem; color: var(--tx-muted);
    border: 1px solid var(--bd-subtle);
    transition: all var(--dur-fast);
    text-decoration: none;
}
.sf-btn:hover {
    background: var(--bg-hover); color: var(--tx-secondary);
    border-color: var(--bd-medium); text-decoration: none;
}

/* ══════════════════════════════════════════════════════════════════════════
   MAIN CONTENT AREA
══════════════════════════════════════════════════════════════════════════ */
#main-content {
    flex: 1; display: flex; flex-direction: column;
    overflow: hidden; min-width: 0;
}

/* ── Top Bar ────────────────────────────────────────────────────────────── */
.topbar {
    height: var(--topbar-h);
    display: flex; align-items: center; justify-content: space-between;
    padding: 0 20px 0 16px;
    border-bottom: 1px solid var(--bd-subtle);
    background: var(--bg-glass);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    flex-shrink: 0; position: sticky; top: 0; z-index: 100;
}
.topbar-left { display: flex; align-items: center; gap: 10px; min-width: 0; }
.topbar-right { display: flex; align-items: center; gap: 6px; flex-shrink: 0; }

.icon-btn {
    width: 32px; height: 32px; display: flex; align-items: center; justify-content: center;
    border-radius: 7px; color: var(--tx-muted);
    transition: all var(--dur-fast);
}
.icon-btn:hover { background: var(--bg-hover); color: var(--tx-primary); }

/* Breadcrumbs */
.breadcrumbs {
    display: flex; align-items: center; gap: 6px;
    font-size: .78rem; color: var(--tx-muted);
    min-width: 0; overflow: hidden;
}
.bc-home-btn {
    color: var(--tx-muted); font-size: .78rem;
    transition: color var(--dur-fast);
}
.bc-home-btn:hover { color: var(--tx-primary); }
.bc-section, .bc-page { color: var(--tx-primary); font-weight: 500; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.bc-sep-2.hidden, .bc-page.hidden { display: none; }
.breadcrumbs svg { color: var(--tx-faint); flex-shrink: 0; }

/* Top Bar Buttons */
.tb-search-pill {
    display: flex; align-items: center; gap: 8px;
    padding: 6px 12px; border-radius: 8px;
    background: var(--bg-surface); border: 1px solid var(--bd-subtle);
    color: var(--tx-muted); font-size: .78rem;
    transition: all var(--dur-fast);
}
.tb-search-pill:hover {
    border-color: var(--bd-medium); background: var(--bg-elevated);
    color: var(--tx-secondary);
}
.tb-search-pill kbd {
    font-size: .62rem; font-family: var(--font-mono);
    background: var(--bg-base); border: 1px solid var(--bd-subtle);
    border-radius: 4px; padding: 1px 5px; color: var(--tx-faint);
}
.tb-action-btn {
    display: flex; align-items: center; gap: 6px;
    padding: 6px 12px; border-radius: 8px;
    background: var(--bg-surface); border: 1px solid var(--bd-subtle);
    color: var(--tx-secondary); font-size: .78rem; font-weight: 500;
    transition: all var(--dur-fast);
}
.tb-action-btn:hover {
    background: var(--bg-hover); border-color: var(--bd-medium);
    color: var(--tx-primary);
}
.tb-action-btn.accent-btn {
    background: var(--accent-glow); border-color: rgba(59,130,246,.3);
    color: var(--tx-accent);
}
.tb-action-btn.accent-btn:hover {
    background: rgba(59,130,246,.25); border-color: rgba(59,130,246,.5);
    color: #93c5fd;
}
.tb-icon-btn {
    width: 32px; height: 32px; display: flex; align-items: center; justify-content: center;
    border-radius: 7px; color: var(--tx-muted); border: 1px solid var(--bd-subtle);
    background: var(--bg-surface);
    transition: all var(--dur-fast);
}
.tb-icon-btn:hover {
    background: var(--bg-hover); border-color: var(--bd-medium);
    color: var(--tx-primary);
}

/* ── Content Viewport ───────────────────────────────────────────────────── */
.content-viewport {
    flex: 1; overflow-y: auto; overflow-x: hidden;
    overscroll-behavior: contain;
}
.article-layout {
    display: flex; gap: 0; max-width: 1280px;
    margin: 0 auto; padding: 0 24px 80px;
}

/* ── Article / Markdown Body ────────────────────────────────────────────── */
.markdown-body {
    flex: 1; min-width: 0;
    padding: 36px 0 36px 0;
    max-width: 820px;
}

/* Heading styles */
.markdown-body h1 {
    font-size: 2rem; font-weight: 700; color: var(--tx-primary);
    letter-spacing: -.025em; line-height: 1.25;
    padding-bottom: 16px; margin-bottom: 24px;
    border-bottom: 1px solid var(--bd-subtle);
}
.markdown-body h2 {
    font-size: 1.3rem; font-weight: 600; color: var(--tx-primary);
    letter-spacing: -.015em; margin-top: 40px; margin-bottom: 14px;
    padding-bottom: 8px; border-bottom: 1px solid var(--bd-subtle);
}
.markdown-body h3 {
    font-size: 1.05rem; font-weight: 600; color: var(--tx-primary);
    margin-top: 28px; margin-bottom: 10px; letter-spacing: -.01em;
}
.markdown-body h4 {
    font-size: .9rem; font-weight: 600; color: var(--tx-primary);
    margin-top: 20px; margin-bottom: 8px; text-transform: uppercase;
    letter-spacing: .06em; font-size: .75rem; color: var(--tx-muted);
}
.markdown-body h5, .markdown-body h6 {
    font-size: .85rem; font-weight: 600; color: var(--tx-muted);
    margin-top: 16px; margin-bottom: 6px;
}
/* Anchor links */
.heading-anchor {
    opacity: 0; color: var(--tx-faint); margin-left: 8px;
    font-size: .75em; text-decoration: none;
    transition: opacity var(--dur-fast);
}
.markdown-body h1:hover .heading-anchor,
.markdown-body h2:hover .heading-anchor,
.markdown-body h3:hover .heading-anchor { opacity: 1; }

/* Paragraphs */
.markdown-body p { margin-bottom: 14px; line-height: 1.8; }
.markdown-body p:last-child { margin-bottom: 0; }

/* Lists */
.markdown-body ul, .markdown-body ol {
    padding-left: 1.6em; margin-bottom: 14px;
}
.markdown-body li { margin-bottom: 4px; line-height: 1.7; }
.markdown-body li ul, .markdown-body li ol { margin-top: 4px; margin-bottom: 4px; }
.markdown-body ul > li { list-style-type: disc; }
.markdown-body ul > li > ul > li { list-style-type: circle; }

/* Code */
.markdown-body code:not([class]) {
    font-family: var(--font-mono); font-size: .82em;
    background: var(--bg-elevated); color: #7dd3fc;
    padding: 2px 6px; border-radius: 5px;
    border: 1px solid var(--bd-subtle);
}

.markdown-body pre {
    position: relative; margin: 18px 0;
    border-radius: 10px; overflow: hidden;
    border: 1px solid var(--bd-subtle);
    background: var(--bg-elevated) !important;
}
.markdown-body pre code {
    background: none !important; color: inherit !important;
    padding: 0 !important; border: none !important;
    font-size: .82rem !important; line-height: 1.7;
}
/* Pre header bar */
.code-block-wrap { position: relative; }
.code-block-lang {
    display: flex; align-items: center; justify-content: space-between;
    padding: 7px 14px;
    border-bottom: 1px solid var(--bd-subtle);
    background: rgba(255,255,255,.03);
}
.code-lang-badge {
    font-family: var(--font-mono); font-size: .65rem; font-weight: 600;
    letter-spacing: .06em; text-transform: uppercase; color: var(--tx-faint);
}
.copy-code-btn {
    display: flex; align-items: center; gap: 4px;
    font-size: .65rem; color: var(--tx-muted);
    padding: 2px 8px; border-radius: 4px;
    transition: all var(--dur-fast); background: none; border: none;
}
.copy-code-btn:hover { background: var(--bg-hover); color: var(--tx-secondary); }
.copy-code-btn.copied { color: var(--accent-3); }
.markdown-body pre code[class*="language-"] { display: block; padding: 14px 16px !important; }

/* Tables */
.markdown-body table {
    width: 100%; border-collapse: collapse; margin: 18px 0;
    font-size: .83rem; border-radius: 8px; overflow: hidden;
    border: 1px solid var(--bd-subtle);
}
.markdown-body th {
    background: var(--bg-elevated); color: var(--tx-primary);
    padding: 9px 14px; text-align: left; font-weight: 600;
    font-size: .72rem; letter-spacing: .04em; text-transform: uppercase;
    border-bottom: 1px solid var(--bd-medium);
}
.markdown-body td {
    padding: 8px 14px; color: var(--tx-secondary);
    border-bottom: 1px solid var(--bd-subtle);
    vertical-align: top;
}
.markdown-body tr:last-child td { border-bottom: none; }
.markdown-body tr:hover td { background: rgba(255,255,255,.02); }

/* Blockquotes */
.markdown-body blockquote {
    margin: 18px 0; padding: 12px 18px;
    border-left: 3px solid var(--accent);
    background: var(--bg-elevated); border-radius: 0 8px 8px 0;
    color: var(--tx-secondary);
}
.markdown-body blockquote p { margin-bottom: 0; }

/* Horizontal rules */
.markdown-body hr {
    border: none; border-top: 1px solid var(--bd-subtle);
    margin: 32px 0;
}

/* Images */
.markdown-body img {
    max-width: 100%; border-radius: 10px;
    border: 1px solid var(--bd-subtle);
}

/* Strong and em */
.markdown-body strong { color: var(--tx-primary); font-weight: 600; }
.markdown-body em { color: var(--tx-secondary); font-style: italic; }

/* Math blocks */
.katex-display-container {
    margin: 24px 0;
    padding: 16px 20px;
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--bd-subtle);
    border-radius: 10px;
    overflow-x: auto;
    overflow-y: hidden;
    text-align: center;
    transition: border-color var(--tr-fast), background var(--tr-fast);
}
.katex-display-container:hover {
    border-color: rgba(59, 130, 246, 0.35);
    background: rgba(59, 130, 246, 0.03);
}
.katex-display { margin: 0 !important; overflow-x: auto; padding: 4px 0; }
.katex-display > .katex { font-size: 1.12em; color: var(--tx-primary); }
.katex { color: var(--tx-primary); font-size: 1.02em; }
.katex-error { color: #f43f5e; font-family: var(--font-mono); font-size: 0.85em; }

/* Mermaid diagrams */
.mermaid-wrap {
    background: var(--bg-elevated); border: 1px solid var(--bd-subtle);
    border-radius: 10px; padding: 20px; margin: 18px 0;
    text-align: center;
}

/* ── TOC Sidebar (right) ────────────────────────────────────────────────── */
.toc-sidebar {
    width: var(--toc-w); flex-shrink: 0;
    padding-left: 28px; padding-top: 36px;
}
.toc-sticky {
    position: sticky; top: 16px;
    max-height: calc(100vh - 100px);
    overflow-y: auto;
}
.toc-header-row {
    display: flex; align-items: center; gap: 6px;
    font-size: .62rem; font-weight: 700; letter-spacing: .1em;
    text-transform: uppercase; color: var(--tx-faint);
    margin-bottom: 10px;
}
.toc-nav-list { display: flex; flex-direction: column; gap: 1px; }
.toc-link {
    font-size: .74rem; color: var(--tx-muted); padding: 3px 0 3px 10px;
    border-left: 2px solid var(--bd-subtle);
    transition: all var(--dur-fast); display: block;
    text-decoration: none; line-height: 1.4;
}
.toc-link:hover { color: var(--tx-primary); border-color: var(--bd-medium); text-decoration: none; }
.toc-link.active { color: var(--tx-accent); border-color: var(--accent); font-weight: 500; }
.toc-link.h3 { padding-left: 20px; font-size: .7rem; }

.toc-meta-box {
    margin-top: 20px; padding-top: 16px;
    border-top: 1px solid var(--bd-subtle);
}
.meta-row {
    display: flex; align-items: flex-start; gap: 6px;
    margin-bottom: 8px; font-size: .72rem; color: var(--tx-muted);
}
.meta-label { color: var(--tx-faint); font-weight: 600; min-width: 56px; }
.meta-badge {
    display: inline-block; padding: 1px 7px; border-radius: 20px;
    font-size: .62rem; font-weight: 600;
}
.meta-badge.attn { background: rgba(59,130,246,.12); color: var(--accent); }
.meta-badge.comp { background: rgba(6,182,212,.12); color: var(--accent-2); }
.meta-badge.fw   { background: rgba(16,185,129,.12); color: var(--accent-3); }

/* ── Back to Top Button ─────────────────────────────────────────────────── */
.back-to-top-btn {
    position: fixed; bottom: 28px; right: 28px; z-index: 300;
    width: 40px; height: 40px; border-radius: 50%;
    background: var(--bg-elevated); border: 1px solid var(--bd-medium);
    color: var(--tx-secondary); display: flex; align-items: center; justify-content: center;
    opacity: 0; transform: translateY(12px); pointer-events: none;
    transition: all var(--dur-med) var(--ease-out);
    box-shadow: 0 4px 16px rgba(0,0,0,0.3);
}
.back-to-top-btn.visible {
    opacity: 1; transform: translateY(0); pointer-events: auto;
}
.back-to-top-btn:hover {
    background: var(--bg-hover); border-color: var(--bd-accent);
    color: var(--tx-accent); transform: translateY(-2px);
}

/* ── Mobile Overlay ─────────────────────────────────────────────────────── */
.sidebar-overlay {
    display: none; position: fixed; inset: 0;
    background: rgba(5,7,16,0.6); z-index: 190;
    backdrop-filter: blur(2px);
}

/* ══════════════════════════════════════════════════════════════════════════
   WELCOME / HOME DASHBOARD
══════════════════════════════════════════════════════════════════════════ */
.home-hero {
    padding: 48px 0 40px;
    border-bottom: 1px solid var(--bd-subtle);
    margin-bottom: 40px;
    position: relative; overflow: hidden;
}
.home-hero-bg {
    position: absolute; inset: 0; pointer-events: none;
    background: radial-gradient(ellipse 60% 50% at 80% 50%, rgba(59,130,246,.07) 0%, transparent 70%);
}
.home-eyebrow {
    display: inline-flex; align-items: center; gap: 6px;
    font-size: .65rem; font-weight: 700; letter-spacing: .12em; text-transform: uppercase;
    color: var(--tx-accent); margin-bottom: 16px;
    background: var(--accent-glow); padding: 4px 12px; border-radius: 20px;
    border: 1px solid rgba(59,130,246,.2);
}
.home-eyebrow-dot {
    width: 6px; height: 6px; border-radius: 50%;
    background: var(--accent); animation: blink 2s ease-in-out infinite;
}
@keyframes blink { 0%,100% { opacity: 1; } 50% { opacity: .4; } }

.home-title {
    font-size: 2.8rem; font-weight: 800; color: var(--tx-primary);
    letter-spacing: -.04em; line-height: 1.1; margin-bottom: 16px;
}
.home-title span { color: var(--accent-hover); }
.home-subtitle {
    font-size: 1rem; color: var(--tx-muted); max-width: 600px; line-height: 1.7;
    margin-bottom: 28px;
}
.home-actions {
    display: flex; gap: 10px; flex-wrap: wrap;
}
.hero-btn {
    display: inline-flex; align-items: center; gap: 8px;
    padding: 10px 20px; border-radius: 9px; font-size: .85rem; font-weight: 600;
    transition: all var(--dur-fast);
}
.hero-btn-primary {
    background: var(--accent); color: #fff;
    box-shadow: 0 4px 18px rgba(59,130,246,.35);
}
.hero-btn-primary:hover {
    background: var(--accent-hover); transform: translateY(-1px);
    box-shadow: 0 6px 24px rgba(59,130,246,.45);
    color: #fff; text-decoration: none;
}
.hero-btn-secondary {
    background: var(--bg-elevated); color: var(--tx-secondary);
    border: 1px solid var(--bd-medium);
}
.hero-btn-secondary:hover {
    background: var(--bg-hover); color: var(--tx-primary);
    text-decoration: none; transform: translateY(-1px);
}

/* Stats Cards Row */
.stats-grid {
    display: grid; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 12px; margin-bottom: 40px;
}
.stat-card {
    background: var(--bg-surface); border: 1px solid var(--bd-subtle);
    border-radius: 12px; padding: 20px 18px;
    transition: all var(--dur-fast); cursor: pointer;
    position: relative; overflow: hidden;
}
.stat-card::before {
    content: ''; position: absolute;
    top: 0; left: 0; right: 0; height: 2px;
    background: linear-gradient(90deg, transparent, var(--card-accent, var(--accent)), transparent);
    opacity: 0; transition: opacity var(--dur-fast);
}
.stat-card:hover::before { opacity: 1; }
.stat-card:hover { border-color: var(--bd-medium); transform: translateY(-2px); box-shadow: 0 8px 24px rgba(0,0,0,.2); }
.stat-card-num {
    font-size: 2rem; font-weight: 800; color: var(--tx-primary);
    line-height: 1; font-variant-numeric: tabular-nums; margin-bottom: 4px;
}
.stat-card-label { font-size: .72rem; color: var(--tx-muted); font-weight: 500; }
.stat-card-icon {
    position: absolute; top: 16px; right: 16px;
    width: 32px; height: 32px; border-radius: 8px;
    display: flex; align-items: center; justify-content: center;
    font-size: 1rem;
}

/* Architecture Grid */
.arch-grid-section { margin-bottom: 40px; }
.section-row {
    display: flex; align-items: center; justify-content: space-between;
    margin-bottom: 16px;
}
.section-title-small {
    font-size: .72rem; font-weight: 700; letter-spacing: .08em;
    text-transform: uppercase; color: var(--tx-faint);
}
.see-all-btn {
    font-size: .72rem; color: var(--tx-accent); font-weight: 500;
    padding: 2px 8px; border-radius: 5px;
    transition: background var(--dur-fast);
}
.see-all-btn:hover { background: var(--accent-glow); text-decoration: none; }

.arch-grid {
    display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 8px;
}
.arch-card {
    background: var(--bg-surface); border: 1px solid var(--bd-subtle);
    border-radius: 10px; padding: 14px 16px;
    cursor: pointer; transition: all var(--dur-fast);
    display: flex; flex-direction: column; gap: 6px;
}
.arch-card:hover {
    border-color: var(--bd-accent); background: var(--bg-elevated);
    transform: translateY(-1px); box-shadow: 0 4px 16px rgba(0,0,0,.15);
}
.arch-card-type {
    font-size: .6rem; font-weight: 700; letter-spacing: .06em; text-transform: uppercase;
}
.arch-card-type.attn { color: var(--accent); }
.arch-card-type.comp { color: var(--accent-2); }
.arch-card-name {
    font-size: .82rem; font-weight: 600; color: var(--tx-primary);
    line-height: 1.3;
}
.arch-card-tags { display: flex; gap: 4px; flex-wrap: wrap; }
.arch-tag {
    font-size: .58rem; padding: 1px 5px; border-radius: 4px;
    font-weight: 600;
}

/* Category ribbon */
.category-ribbon {
    display: flex; gap: 8px; overflow-x: auto; padding-bottom: 8px;
    margin-bottom: 28px; scrollbar-width: none;
}
.category-ribbon::-webkit-scrollbar { display: none; }
.cat-card {
    flex-shrink: 0; background: var(--bg-surface);
    border: 1px solid var(--bd-subtle); border-radius: 10px;
    padding: 12px 16px; cursor: pointer;
    transition: all var(--dur-fast); text-align: center;
    min-width: 100px;
}
.cat-card:hover { border-color: var(--bd-accent); background: var(--bg-elevated); }
.cat-card.active { border-color: var(--accent); background: var(--accent-glow); }
.cat-emoji { font-size: 1.5rem; display: block; margin-bottom: 4px; }
.cat-name { font-size: .7rem; font-weight: 600; color: var(--tx-secondary); }
.cat-count { font-size: .62rem; color: var(--tx-muted); }

/* ══════════════════════════════════════════════════════════════════════════
   MOBILE / RESPONSIVE
══════════════════════════════════════════════════════════════════════════ */
#mobile-menu-btn { display: none; }

@media (max-width: 1100px) {
    .toc-sidebar { display: none; }
    .markdown-body { max-width: 100%; }
}

@media (max-width: 768px) {
    :root { --sidebar-w: 280px; }
    #mobile-menu-btn { display: flex; }
    #sidebar {
        position: fixed; left: 0; top: 0; bottom: 0;
        transform: translateX(-100%);
        z-index: 200; transition: transform var(--dur-med) var(--ease-out);
        box-shadow: 4px 0 24px rgba(0,0,0,.4);
    }
    #sidebar.open { transform: translateX(0); }
    .sidebar-overlay.active { display: block; }
    .article-layout { padding: 0 16px 60px; }
    .home-title { font-size: 2rem; }
    .tb-action-btn span { display: none; }
    .tb-search-pill span { display: none; }
    .topbar { padding: 0 12px 0 10px; }
    .tb-action-btn { padding: 6px 8px; }
}

@media (max-width: 480px) {
    .home-title { font-size: 1.6rem; }
    .stats-grid { grid-template-columns: 1fr 1fr; }
    .arch-grid { grid-template-columns: 1fr; }
}

/* ══════════════════════════════════════════════════════════════════════════
   NOTIFICATION TOAST
══════════════════════════════════════════════════════════════════════════ */
.toast {
    position: fixed; bottom: 28px; left: 50%; transform: translateX(-50%) translateY(20px);
    background: var(--bg-elevated); border: 1px solid var(--bd-medium);
    border-radius: 10px; padding: 10px 18px;
    font-size: .8rem; color: var(--tx-primary);
    box-shadow: 0 8px 32px rgba(0,0,0,.4);
    z-index: 9000; pointer-events: none;
    opacity: 0; transition: all 300ms var(--ease-out);
    display: flex; align-items: center; gap: 8px;
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }
.toast-icon { color: var(--accent-3); }

/* ══════════════════════════════════════════════════════════════════════════
   LIGHT THEME OVERRIDES (markdown)
══════════════════════════════════════════════════════════════════════════ */
[data-theme="light"] .markdown-body code:not([class]) {
    background: #eef2ff; color: #3b5bdb; border-color: #c5d0f5;
}
[data-theme="light"] .markdown-body pre { background: #f5f7fc !important; }
[data-theme="light"] .markdown-body blockquote { background: #eef2ff; }
[data-theme="light"] .markdown-body table th { background: #eef2ff; }
[data-theme="light"] .cmd-panel { box-shadow: 0 8px 48px rgba(0,0,0,.12), 0 2px 8px rgba(0,0,0,.08); }

/* ══════════════════════════════════════════════════════════════════════════
   ARCHITECTURE COMPARISON STUDIO
══════════════════════════════════════════════════════════════════════════ */
.compare-overlay {
    position: fixed; inset: 0; z-index: 9500;
    display: flex; align-items: center; justify-content: center;
    padding: 24px;
}
.compare-overlay.hidden { display: none; }
.compare-backdrop {
    position: absolute; inset: 0;
    background: rgba(4, 6, 14, 0.78);
    backdrop-filter: blur(10px);
}
.compare-modal {
    position: relative; z-index: 2;
    width: 100%; max-width: 1080px; max-height: 90vh;
    background: var(--bg-surface);
    border: 1px solid var(--bd-medium);
    border-radius: 16px;
    display: flex; flex-direction: column;
    box-shadow: 0 24px 64px rgba(0, 0, 0, 0.6);
    overflow: hidden;
    animation: fadeInUp 200ms var(--ease-out);
}
.compare-modal-header {
    display: flex; align-items: center; justify-content: space-between;
    padding: 18px 24px;
    border-bottom: 1px solid var(--bd-subtle);
    background: var(--bg-elevated);
}
.compare-modal-title {
    display: flex; align-items: center; gap: 10px;
    font-size: 1.05rem; font-weight: 600; color: var(--tx-primary);
}
.compare-modal-title svg { color: var(--accent); }
.compare-close-btn {
    background: none; border: none; font-size: 1.1rem; color: var(--tx-muted);
    cursor: pointer; padding: 4px 8px; border-radius: 6px;
    transition: all var(--tr-fast);
}
.compare-close-btn:hover { color: var(--tx-primary); background: rgba(255,255,255,0.06); }
.compare-modal-body {
    padding: 24px; overflow-y: auto; flex: 1; display: flex; flex-direction: column; gap: 20px;
}
.compare-selector-bar {
    display: flex; flex-direction: column; gap: 10px;
}
.compare-sel-label {
    font-size: 0.8rem; font-weight: 500; color: var(--tx-secondary); text-transform: uppercase; letter-spacing: 0.5px;
}
.compare-chips-container {
    display: flex; flex-wrap: wrap; gap: 8px; max-height: 120px; overflow-y: auto; padding: 4px;
}
.comp-select-chip {
    display: inline-flex; align-items: center; gap: 6px;
    padding: 5px 12px; border-radius: 20px;
    background: var(--bg-elevated); border: 1px solid var(--bd-subtle);
    font-size: 0.78rem; color: var(--tx-secondary); cursor: pointer;
    transition: all var(--tr-fast); user-select: none;
}
.comp-select-chip:hover {
    border-color: var(--accent); color: var(--tx-primary);
}
.comp-select-chip.active {
    background: rgba(59, 130, 246, 0.18);
    border-color: var(--accent); color: var(--accent-hover);
    font-weight: 600;
}
.compare-matrix-view {
    overflow-x: auto;
}
.compare-table {
    width: 100%; border-collapse: collapse; text-align: left;
    font-size: 0.82rem; border-radius: 10px; overflow: hidden;
}
.compare-table th, .compare-table td {
    padding: 12px 16px; border: 1px solid var(--bd-subtle);
}
.compare-table th {
    background: var(--bg-elevated); color: var(--tx-primary); font-weight: 600;
}
.compare-table tr:nth-child(even) { background: rgba(255, 255, 255, 0.015); }
.compare-table .metric-label { font-weight: 600; color: var(--tx-secondary); width: 220px; }
.compare-val-best { color: var(--accent-3); font-weight: 600; }
.compare-badge-sub {
    font-size: 0.7rem; padding: 2px 6px; border-radius: 4px; background: rgba(59, 130, 246, 0.12); color: var(--accent);
}

.compare-view-doc-btn {
    display: inline-flex; align-items: center; gap: 4px;
    margin-top: 6px; padding: 3px 8px; border-radius: 4px;
    background: rgba(59, 130, 246, 0.1); border: 1px solid rgba(59, 130, 246, 0.25);
    color: var(--accent-hover); font-size: 0.72rem; cursor: pointer;
    text-decoration: none; transition: all var(--tr-fast);
}
.compare-view-doc-btn:hover {
    background: var(--accent); color: #ffffff; border-color: var(--accent);
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        transition-duration: 0.01ms !important;
    }
}
Xet Storage Details

Size:: 44.1 kB
Xet hash:: d1b5da30ecbcd89d225eb70a9b1d07a1ddfb3af2f60b03ae18a7d9639e09de14
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