/* ═══════════════════════════════════════════════════════════════════
   Mozhii AL — Product Documentation
   Light Mode (Default) Stylesheet
   ═══════════════════════════════════════════════════════════════════ */

/* ─── CSS VARIABLES ─────────────────────────────────────────────── */
:root {
  --bg: #f8f9fc;
  --bg2: #ffffff;
  --bg3: #f1f3f8;
  --bg4: #e8ebf2;
  --sidebar: #ffffff;
  --border: rgba(0, 0, 0, 0.08);
  --border2: rgba(0, 0, 0, 0.12);
  --purple: #7c3aed;
  --purple-light: #6d28d9;
  --purple-dim: rgba(124, 58, 237, 0.08);
  --purple-glow: rgba(124, 58, 237, 0.06);
  --text: #1a1a2e;
  --text2: #4a4a68;
  --text3: #8888a0;
  --green: #059669;
  --amber: #d97706;
  --red: #dc2626;
  --blue: #2563eb;
  --cyan: #0891b2;
  --font-display: 'Syne', sans-serif;
  --font-body: 'DM Sans', sans-serif;
  --font-mono: 'IBM Plex Mono', monospace;
  --sidebar-w: 268px;
  --header-h: 58px;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.08);
  --transition: 0.2s ease;
}

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

html {
  scroll-behavior: smooth;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.75;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ─── SCROLLBAR ─────────────────────────────────────────────────── */
::-webkit-scrollbar {
  width: 5px;
  height: 5px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--border2);
  border-radius: 10px;
}

::-webkit-scrollbar-thumb:hover {
  background: rgba(0, 0, 0, 0.2);
}

/* ─── HEADER ────────────────────────────────────────────────────── */
#top-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-h);
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  padding: 0 24px;
  gap: 16px;
  z-index: 100;
  box-shadow: var(--shadow-sm);
}

.header-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  flex-shrink: 0;
}

.header-logo {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  object-fit: contain;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

/* Fallback when no logo image is set */
.header-logo-fallback {
  width: 32px;
  height: 32px;
  background: linear-gradient(135deg, var(--purple), #a78bfa);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 13px;
  color: #fff;
  letter-spacing: -0.5px;
  flex-shrink: 0;
}

.header-name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 16px;
  color: var(--text);
  letter-spacing: -0.3px;
}

.header-sep {
  width: 1px;
  height: 20px;
  background: var(--border2);
  flex-shrink: 0;
}

.header-section {
  font-size: 13px;
  color: var(--text2);
  font-family: var(--font-body);
}

.header-right {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 10px;
}

.version-badge {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  background: var(--purple-dim);
  color: var(--purple);
  border: 1px solid rgba(124, 58, 237, 0.18);
  padding: 3px 10px;
  border-radius: 100px;
  letter-spacing: 0.3px;
}

.status-badge {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  background: rgba(5, 150, 105, 0.08);
  color: var(--green);
  border: 1px solid rgba(5, 150, 105, 0.18);
  padding: 3px 10px;
  border-radius: 100px;
  letter-spacing: 0.3px;
  display: flex;
  align-items: center;
  gap: 5px;
}

.status-dot {
  width: 6px;
  height: 6px;
  background: var(--green);
  border-radius: 50%;
  animation: pulse 2s infinite;
}

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

.header-date {
  font-size: 12px;
  color: var(--text3);
  font-family: var(--font-mono);
}

/* ─── MOBILE MENU TOGGLE ───────────────────────────────────────── */
.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
  border-radius: 6px;
  transition: background var(--transition);
  flex-shrink: 0;
}

.mobile-menu-btn:hover {
  background: var(--bg3);
}

.mobile-menu-btn svg {
  display: block;
  width: 22px;
  height: 22px;
  color: var(--text);
}

/* ─── SIDEBAR OVERLAY (Mobile) ─────────────────────────────────── */
.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.3);
  z-index: 55;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.sidebar-overlay.active {
  opacity: 1;
}

/* ─── LAYOUT ────────────────────────────────────────────────────── */
#layout {
  display: flex;
  padding-top: var(--header-h);
  min-height: 100vh;
}

/* ─── SIDEBAR ───────────────────────────────────────────────────── */
#sidebar {
  position: fixed;
  top: var(--header-h);
  left: 0;
  width: var(--sidebar-w);
  height: calc(100vh - var(--header-h));
  overflow-y: auto;
  background: var(--sidebar);
  border-right: 1px solid var(--border);
  padding: 20px 0 60px;
  z-index: 60;
  box-shadow: 1px 0 0 var(--border);
  transition: transform 0.3s ease;
}

.sidebar-group {
  margin-bottom: 4px;
}

.sidebar-group-title {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 1.2px;
  color: var(--text3);
  padding: 10px 20px 6px;
}

.sidebar-link {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 7px 20px;
  font-size: 13.5px;
  color: var(--text2);
  text-decoration: none;
  transition: all var(--transition);
  border-left: 2px solid transparent;
  font-family: var(--font-body);
  font-weight: 400;
  line-height: 1.4;
  border-radius: 0;
}

.sidebar-link:hover {
  color: var(--text);
  background: rgba(0, 0, 0, 0.03);
}

.sidebar-link.active {
  color: var(--purple);
  background: var(--purple-glow);
  border-left-color: var(--purple);
  font-weight: 500;
}

.sidebar-num {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--text3);
  min-width: 18px;
}

.sidebar-link.active .sidebar-num {
  color: var(--purple);
}

.sidebar-divider {
  margin: 8px 20px;
  border: none;
  border-top: 1px solid var(--border);
}

/* ─── MAIN CONTENT ──────────────────────────────────────────────── */
#content {
  margin-left: var(--sidebar-w);
  flex: 1;
  min-width: 0;
  max-width: 900px;
  padding: 52px 64px 120px;
}

/* ─── HERO ──────────────────────────────────────────────────────── */
#doc-hero {
  margin-bottom: 60px;
  padding-bottom: 48px;
  border-bottom: 1px solid var(--border);
}

.hero-eyebrow {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 18px;
  flex-wrap: wrap;
}

.hero-tag {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--purple);
  background: var(--purple-dim);
  padding: 4px 12px;
  border-radius: 100px;
  border: 1px solid rgba(124, 58, 237, 0.15);
  font-weight: 500;
}

.hero-tag-gray {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text3);
  background: rgba(0, 0, 0, 0.03);
  padding: 4px 12px;
  border-radius: 100px;
  border: 1px solid var(--border);
}

.hero-title {
  font-family: var(--font-display);
  font-size: 44px;
  font-weight: 800;
  color: var(--text);
  letter-spacing: -1.5px;
  line-height: 1.1;
  margin-bottom: 16px;
}

.hero-title span {
  color: var(--purple);
}

.hero-subtitle {
  font-size: 17px;
  color: var(--text2);
  line-height: 1.7;
  max-width: 560px;
  font-weight: 300;
  margin-bottom: 28px;
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
}

.hero-meta-item {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.hero-meta-label {
  font-family: var(--font-mono);
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: var(--text3);
}

.hero-meta-value {
  font-size: 14px;
  font-weight: 500;
  color: var(--text);
}

/* ─── SECTIONS ──────────────────────────────────────────────────── */
.doc-section {
  margin-bottom: 72px;
  scroll-margin-top: calc(var(--header-h) + 28px);
}

/* ─── HEADINGS ──────────────────────────────────────────────────── */
.sec-h1 {
  font-family: var(--font-display);
  font-size: 26px;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.5px;
  margin-bottom: 24px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 12px;
}

.sec-h1-num {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  color: var(--purple);
  background: var(--purple-dim);
  padding: 3px 8px;
  border-radius: 5px;
  letter-spacing: 0;
  flex-shrink: 0;
}

.sec-h2 {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 600;
  color: var(--text);
  letter-spacing: -0.2px;
  margin: 32px 0 14px;
}

.sec-h3 {
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 500;
  color: var(--purple);
  text-transform: uppercase;
  letter-spacing: 0.8px;
  margin: 24px 0 10px;
}

/* ─── PROSE ─────────────────────────────────────────────────────── */
.prose {
  color: var(--text2);
  font-size: 14.5px;
  line-height: 1.8;
  margin-bottom: 16px;
  font-weight: 300;
}

.prose strong {
  color: var(--text);
  font-weight: 500;
}

/* ─── CALLOUT BOXES ─────────────────────────────────────────────── */
.callout {
  border-radius: 10px;
  padding: 16px 20px;
  margin: 20px 0;
  border-left: 3px solid;
  font-size: 13.5px;
  line-height: 1.7;
  box-shadow: var(--shadow-sm);
}

.callout-title {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  margin-bottom: 5px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.callout-icon {
  font-size: 11px;
}

.callout-body {
  color: inherit;
  font-weight: 300;
  white-space: pre-line;
}

.callout.info {
  background: rgba(124, 58, 237, 0.05);
  border-color: var(--purple);
  color: var(--purple-light);
}

.callout.info .callout-title {
  color: var(--purple);
}

.callout.warning {
  background: rgba(217, 119, 6, 0.06);
  border-color: var(--amber);
  color: #92400e;
}

.callout.warning .callout-title {
  color: var(--amber);
}

.callout.danger {
  background: rgba(220, 38, 38, 0.05);
  border-color: var(--red);
  color: #991b1b;
}

.callout.danger .callout-title {
  color: var(--red);
}

.callout.success {
  background: rgba(5, 150, 105, 0.05);
  border-color: var(--green);
  color: #065f46;
}

.callout.success .callout-title {
  color: var(--green);
}

/* ─── CODE BLOCKS ───────────────────────────────────────────────── */
.code-block {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: 10px;
  margin: 16px 0;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.code-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 14px;
  border-bottom: 1px solid var(--border);
  background: var(--bg3);
}

.code-dots {
  display: flex;
  gap: 5px;
}

.code-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
}

.code-dot.r { background: #ff5f57; }
.code-dot.y { background: #febc2e; }
.code-dot.g { background: #28c840; }

.code-lang {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--text3);
  text-transform: uppercase;
  letter-spacing: 0.8px;
}

.code-body {
  padding: 18px 20px;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 12.5px;
  line-height: 1.7;
  color: #3b4261;
  background: #fafbfe;
}

.code-body .kw { color: #7c3aed; }
.code-body .str { color: #059669; }
.code-body .num { color: #d97706; }
.code-body .cm { color: #9ca3af; font-style: italic; }
.code-body .fn { color: #2563eb; }
.code-body .key { color: #0891b2; }
.code-body .op { color: #6366f1; }

/* ─── TABLES ────────────────────────────────────────────────────── */
.doc-table-wrap {
  margin: 16px 0;
  overflow-x: auto;
  border-radius: 10px;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
}

.doc-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13.5px;
}

.doc-table thead tr {
  background: var(--bg3);
  border-bottom: 1px solid var(--border2);
}

.doc-table thead th {
  padding: 10px 14px;
  text-align: left;
  font-family: var(--font-mono);
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: var(--text3);
  font-weight: 500;
  white-space: nowrap;
}

.doc-table tbody tr {
  border-bottom: 1px solid var(--border);
  transition: background var(--transition);
}

.doc-table tbody tr:last-child {
  border-bottom: none;
}

.doc-table tbody tr:hover {
  background: rgba(0, 0, 0, 0.015);
}

.doc-table tbody td {
  padding: 10px 14px;
  color: var(--text2);
  font-weight: 300;
  vertical-align: top;
}

.doc-table tbody td:first-child {
  color: var(--text);
  font-weight: 400;
  font-family: var(--font-mono);
  font-size: 12px;
}

.doc-table .highlight-row td {
  background: rgba(124, 58, 237, 0.05);
  color: var(--purple);
  font-weight: 500;
  font-family: var(--font-display);
}

/* ─── LISTS ─────────────────────────────────────────────────────── */
.doc-list {
  list-style: none;
  margin: 12px 0;
}

.doc-list li {
  display: flex;
  gap: 10px;
  padding: 5px 0;
  font-size: 14px;
  color: var(--text2);
  font-weight: 300;
  line-height: 1.6;
}

.doc-list li::before {
  content: "—";
  color: var(--purple);
  font-family: var(--font-mono);
  font-size: 12px;
  margin-top: 2px;
  flex-shrink: 0;
}

.doc-list.numbered {
  counter-reset: item;
}

.doc-list.numbered li {
  counter-increment: item;
}

.doc-list.numbered li::before {
  content: counter(item, decimal-leading-zero);
  color: var(--purple);
  font-family: var(--font-mono);
  font-size: 11px;
  margin-top: 3px;
  min-width: 22px;
}

.doc-list li strong {
  color: var(--text);
  font-weight: 500;
}

/* ─── BADGES ────────────────────────────────────────────────────── */
.badge {
  display: inline-flex;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 11px;
  padding: 2px 8px;
  border-radius: 100px;
  font-weight: 500;
}

.badge-green {
  background: rgba(5, 150, 105, 0.08);
  color: var(--green);
}

.badge-red {
  background: rgba(220, 38, 38, 0.08);
  color: var(--red);
}

.badge-purple {
  background: var(--purple-dim);
  color: var(--purple);
}

.badge-gray {
  background: rgba(0, 0, 0, 0.04);
  color: var(--text2);
}

.badge-amber {
  background: rgba(217, 119, 6, 0.08);
  color: var(--amber);
}

/* ─── ARCHITECTURE BOX ──────────────────────────────────────────── */
.arch-box {
  background: #fafbfe;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 20px;
  margin: 16px 0;
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: var(--cyan);
  line-height: 1.8;
  white-space: pre;
  overflow-x: auto;
  box-shadow: var(--shadow-sm);
}

/* ─── PHASE CARDS ───────────────────────────────────────────────── */
.phase-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
  margin: 16px 0;
}

.phase-card {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 18px 20px;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition), transform var(--transition);
}

.phase-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}

.phase-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--purple), #a78bfa);
  border-radius: 10px 10px 0 0;
}

.phase-num {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--purple);
  text-transform: uppercase;
  letter-spacing: 0.8px;
  margin-bottom: 6px;
}

.phase-title {
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 8px;
}

.phase-weeks {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--text3);
  margin-bottom: 10px;
}

.phase-items {
  list-style: none;
}

.phase-items li {
  font-size: 12.5px;
  color: var(--text2);
  padding: 2px 0;
  display: flex;
  gap: 7px;
  font-weight: 300;
}

.phase-items li::before {
  content: "·";
  color: var(--purple);
  font-size: 14px;
  margin-top: -1px;
  flex-shrink: 0;
}

/* ─── STACK CARDS ───────────────────────────────────────────────── */
.stack-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin: 16px 0;
}

.stack-card {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 14px;
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition), transform var(--transition);
}

.stack-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}

.stack-layer {
  font-family: var(--font-mono);
  font-size: 9px;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: var(--text3);
  margin-bottom: 5px;
}

.stack-tech {
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 600;
  color: var(--cyan);
  margin-bottom: 3px;
}

.stack-reason {
  font-size: 11.5px;
  color: var(--text3);
  font-weight: 300;
  line-height: 1.5;
}

/* ─── COST TABLE ────────────────────────────────────────────────── */
.cost-total td {
  background: var(--bg3) !important;
  color: var(--green) !important;
  font-weight: 600 !important;
  font-family: var(--font-mono) !important;
  font-size: 13px !important;
  border-top: 1px solid var(--border2) !important;
}

/* ─── RULE BOX ──────────────────────────────────────────────────── */
.rule-box {
  display: flex;
  gap: 14px;
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 16px 18px;
  margin: 16px 0;
  align-items: flex-start;
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition);
}

.rule-box:hover {
  box-shadow: var(--shadow-md);
}

.rule-icon {
  width: 30px;
  height: 30px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-size: 14px;
  font-weight: 600;
  font-family: var(--font-mono);
}

.rule-icon.purple {
  background: var(--purple-dim);
  color: var(--purple);
}

.rule-icon.red {
  background: rgba(220, 38, 38, 0.08);
  color: var(--red);
}

.rule-icon.green {
  background: rgba(5, 150, 105, 0.08);
  color: var(--green);
}

.rule-icon.amber {
  background: rgba(217, 119, 6, 0.08);
  color: var(--amber);
}

.rule-content {
  flex: 1;
}

.rule-title {
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 4px;
}

.rule-desc {
  font-size: 13px;
  color: var(--text2);
  font-weight: 300;
  line-height: 1.65;
}

/* ─── SECTION DIVIDER ───────────────────────────────────────────── */
.sec-divider {
  border: none;
  border-top: 1px solid var(--border);
  margin: 48px 0 0;
}

/* ─── TOC ───────────────────────────────────────────────────────── */
.toc-box {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 20px 24px;
  margin-bottom: 48px;
  box-shadow: var(--shadow-sm);
}

.toc-title {
  font-family: var(--font-mono);
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: var(--text3);
  margin-bottom: 14px;
}

.toc-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 4px 20px;
}

.toc-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--text2);
  text-decoration: none;
  padding: 5px 8px;
  transition: all var(--transition);
  border-radius: 6px;
}

.toc-item:hover {
  color: var(--purple);
  background: var(--purple-glow);
}

.toc-item-num {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--text3);
  min-width: 22px;
}

/* ─── FOOTER ────────────────────────────────────────────────────── */
#doc-footer {
  margin-top: 80px;
  padding-top: 28px;
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

.footer-left {
  display: flex;
  align-items: center;
  gap: 10px;
}

.footer-logo-sm {
  width: 22px;
  height: 22px;
  background: linear-gradient(135deg, var(--purple), #a78bfa);
  border-radius: 5px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 9px;
  color: #fff;
}

.footer-name {
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 700;
  color: var(--text);
}

.footer-right {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text3);
}

/* ─── INLINE CODE ───────────────────────────────────────────────── */
code {
  font-family: var(--font-mono);
  font-size: 12px;
  background: rgba(124, 58, 237, 0.06);
  border: 1px solid rgba(124, 58, 237, 0.12);
  padding: 2px 6px;
  border-radius: 4px;
  color: var(--purple);
}

/* ═══════════════════════════════════════════════════════════════════
   RESPONSIVE DESIGN
   ═══════════════════════════════════════════════════════════════════ */

/* ─── TABLET (≤ 1024px) ─────────────────────────────────────────── */
@media (max-width: 1024px) {
  .mobile-menu-btn {
    display: block;
  }

  #sidebar {
    transform: translateX(-100%);
    box-shadow: none;
  }

  #sidebar.open {
    transform: translateX(0);
    box-shadow: var(--shadow-lg);
  }

  .sidebar-overlay.active {
    display: block;
  }

  #content {
    margin-left: 0;
    padding: 32px 28px 80px;
  }

  .header-section {
    display: none;
  }

  .header-sep {
    display: none;
  }
}

/* ─── MOBILE (≤ 768px) ──────────────────────────────────────────── */
@media (max-width: 768px) {
  .header-date {
    display: none;
  }

  .status-badge {
    display: none;
  }

  #content {
    padding: 24px 20px 60px;
  }

  .hero-title {
    font-size: 36px;
  }

  .hero-meta {
    gap: 16px;
  }

  .stack-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .phase-grid {
    grid-template-columns: 1fr;
  }

  .toc-grid {
    grid-template-columns: 1fr;
  }

  .sec-h1 {
    font-size: 22px;
  }
}

/* ─── SMALL MOBILE (≤ 480px) ────────────────────────────────────── */
@media (max-width: 480px) {
  #top-header {
    padding: 0 14px;
    gap: 10px;
  }

  .version-badge {
    display: none;
  }

  .hero-title {
    font-size: 28px;
  }

  .hero-subtitle {
    font-size: 15px;
  }

  #content {
    padding: 20px 16px 50px;
  }

  .stack-grid {
    grid-template-columns: 1fr;
  }

  .code-body {
    padding: 14px 16px;
    font-size: 11.5px;
  }

  .arch-box {
    padding: 16px;
    font-size: 11.5px;
  }

  .callout {
    padding: 14px 16px;
  }

  .doc-table {
    font-size: 12px;
  }

  .doc-table thead th {
    padding: 8px 10px;
  }

  .doc-table tbody td {
    padding: 8px 10px;
  }
}