/* ─────────────────────────────────────────────────────────────────────────
   2davi Lab — Design System
   Shared across all project documentation pages
───────────────────────────────────────────────────────────────────────── */

@import url('https://cdn.jsdelivr.net/gh/orioncactus/pretendard@v1.3.9/dist/web/static/pretendard.min.css');
@import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@400;500&display=swap');

/* ── Design Tokens ───────────────────────────────────────────────────────── */
:root {
  --sidebar-w:        260px;
  --topbar-h:         56px;

  /* Sidebar */
  --sb-bg:            #111827;
  --sb-border:        #1f2937;
  --sb-text:          #9ca3af;
  --sb-text-hover:    #e5e7eb;
  --sb-group:         #6b7280;
  --sb-active:        #60a5fa;
  --sb-active-bg:     rgba(96, 165, 250, 0.1);
  --sb-active-border: #60a5fa;

  /* Topbar */
  --tb-bg:            #ffffff;
  --tb-border:        #e5e7eb;
  --tb-shadow:        0 1px 0 #e5e7eb;

  /* Content */
  --bg:               #ffffff;
  --text:             #111827;
  --text-2:           #374151;
  --text-3:           #6b7280;
  --border:           #e5e7eb;
  --border-2:         #f3f4f6;

  /* Accent */
  --accent:           #3b82f6;
  --accent-2:         #dbeafe;
  --accent-text:      #1d4ed8;

  /* Code */
  --code-bg:          #0f172a;
  --code-border:      #1e293b;
  --code-text:        #e2e8f0;
  --inline-bg:        #f1f5f9;
  --inline-text:      #4f46e5;

  /* Table */
  --th-bg:            #f9fafb;

  /* Misc */
  --radius:           8px;
  --radius-sm:        4px;
  --shadow-sm:        0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
  --shadow:           0 4px 6px rgba(0,0,0,0.07), 0 2px 4px rgba(0,0,0,0.04);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--topbar-h) + 24px);
  font-size: 15px;
}

body {
  font-family: 'Pretendard', 'Apple SD Gothic Neo', -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

/* ── Layout Shell ─────────────────────────────────────────────────────────── */
.layout {
  display: flex;
  min-height: 100vh;
}

/* ── Topbar ───────────────────────────────────────────────────────────────── */
.topbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--topbar-h);
  background: var(--tb-bg);
  border-bottom: 1px solid var(--tb-border);
  display: flex;
  align-items: center;
  padding: 0 20px 0 0;
  z-index: 100;
  gap: 0;
}

.topbar-logo {
  width: var(--sidebar-w);
  flex-shrink: 0;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 0 20px;
  background: var(--sb-bg);
  height: 100%;
  border-bottom: 1px solid var(--sb-border);
  text-decoration: none;
}

.topbar-logo-mark {
  width: 28px;
  height: 28px;
  background: linear-gradient(135deg, #3b82f6, #6366f1);
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  font-weight: 700;
  color: white;
  flex-shrink: 0;
}

.topbar-logo-text {
  font-size: 14px;
  font-weight: 600;
  color: #e5e7eb;
  letter-spacing: -0.01em;
}

.topbar-logo-sub {
  font-size: 10px;
  color: var(--sb-text);
  font-weight: 400;
  letter-spacing: 0.02em;
}

.topbar-content {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-left: 24px;
}

.topbar-breadcrumb {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: var(--text-3);
}

.topbar-breadcrumb a {
  color: var(--text-3);
  text-decoration: none;
  transition: color 0.15s;
}

.topbar-breadcrumb a:hover { color: var(--accent); }

.topbar-breadcrumb .sep { color: var(--border); }

.topbar-breadcrumb .current {
  color: var(--text-2);
  font-weight: 500;
}

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.btn-ghost {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 10px;
  border-radius: var(--radius-sm);
  font-size: 12px;
  font-weight: 500;
  color: var(--text-3);
  text-decoration: none;
  border: 1px solid var(--border);
  background: transparent;
  cursor: pointer;
  transition: all 0.15s;
  font-family: inherit;
}

.btn-ghost:hover {
  color: var(--text);
  background: var(--border-2);
  border-color: #d1d5db;
}

.btn-lang {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.btn-github svg { width: 14px; height: 14px; }

/* ── Sidebar ──────────────────────────────────────────────────────────────── */
.sidebar {
  position: fixed;
  top: var(--topbar-h);
  left: 0;
  width: var(--sidebar-w);
  height: calc(100vh - var(--topbar-h));
  background: var(--sb-bg);
  border-right: 1px solid var(--sb-border);
  overflow-y: auto;
  overflow-x: hidden;
  z-index: 90;
  padding-bottom: 32px;
}

.sidebar::-webkit-scrollbar { width: 4px; }
.sidebar::-webkit-scrollbar-track { background: transparent; }
.sidebar::-webkit-scrollbar-thumb { background: #374151; border-radius: 2px; }

.sidebar-section {
  padding: 20px 0 8px;
}

.sidebar-section + .sidebar-section {
  border-top: 1px solid var(--sb-border);
  padding-top: 16px;
}

.sidebar-group-label {
  padding: 0 16px 6px;
  font-size: 10px;
  font-weight: 700;
  color: var(--sb-group);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.sidebar-nav {
  list-style: none;
}

.sidebar-nav a {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  font-size: 13px;
  color: var(--sb-text);
  text-decoration: none;
  border-left: 2px solid transparent;
  transition: all 0.15s;
  line-height: 1.4;
}

.sidebar-nav a:hover {
  color: var(--sb-text-hover);
  background: rgba(255,255,255,0.04);
}

.sidebar-nav a.active {
  color: var(--sb-active);
  background: var(--sb-active-bg);
  border-left-color: var(--sb-active-border);
  font-weight: 500;
}

.sidebar-nav .nav-badge {
  margin-left: auto;
  font-size: 10px;
  padding: 1px 6px;
  border-radius: 10px;
  font-weight: 600;
  letter-spacing: 0.03em;
}

.nav-badge.light {
  background: rgba(74, 222, 128, 0.15);
  color: #4ade80;
}

.nav-badge.heavy {
  background: rgba(251, 146, 60, 0.15);
  color: #fb923c;
}

/* Back to hub link */
.sidebar-hub-link {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 14px 16px;
  font-size: 12px;
  color: var(--sb-text);
  text-decoration: none;
  border-bottom: 1px solid var(--sb-border);
  transition: all 0.15s;
}

.sidebar-hub-link:hover {
  color: var(--sb-text-hover);
  background: rgba(255,255,255,0.04);
}

/* ── Main Content ─────────────────────────────────────────────────────────── */
.main {
  margin-left: var(--sidebar-w);
  margin-top: var(--topbar-h);
  flex: 1;
  min-width: 0;
}

.content {
  max-width: 860px;
  padding: 48px 48px 96px;
  margin: 0 auto;
}

/* ── Typography ───────────────────────────────────────────────────────────── */
.content h1 {
  font-size: 2rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.03em;
  line-height: 1.2;
  margin-bottom: 12px;
}

.content h1 + .subtitle {
  font-size: 1rem;
  color: var(--text-3);
  margin-bottom: 40px;
  line-height: 1.6;
}

.content h2 {
  font-size: 1.375rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.02em;
  margin-top: 56px;
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border);
}

.content h3 {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text);
  letter-spacing: -0.01em;
  margin-top: 32px;
  margin-bottom: 12px;
}

.content h4 {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-2);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-top: 24px;
  margin-bottom: 10px;
}

.content p {
  color: var(--text-2);
  margin-bottom: 16px;
  line-height: 1.75;
}

.content ul, .content ol {
  padding-left: 20px;
  margin-bottom: 16px;
  color: var(--text-2);
}

.content li {
  margin-bottom: 6px;
  line-height: 1.7;
}

.content a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.15s;
}

.content a:hover {
  border-bottom-color: var(--accent);
}

/* Inline code */
.content code:not(pre code) {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.82em;
  background: var(--inline-bg);
  color: var(--inline-text);
  padding: 2px 6px;
  border-radius: 4px;
  font-weight: 500;
}

/* Code blocks */
.content pre {
  background: var(--code-bg);
  border: 1px solid var(--code-border);
  border-radius: var(--radius);
  overflow: hidden;
  margin: 20px 0;
  box-shadow: var(--shadow-sm);
  position: relative;
}

.code-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 9px 16px;
  background: rgba(255,255,255,0.04);
  border-bottom: 1px solid var(--code-border);
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  color: #64748b;
}

.code-lang {
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: #60a5fa;
}

.copy-btn {
  background: transparent;
  border: 1px solid #334155;
  color: #64748b;
  padding: 2px 8px;
  border-radius: 3px;
  font-size: 10px;
  font-family: inherit;
  cursor: pointer;
  transition: all 0.15s;
}

.copy-btn:hover {
  background: #1e293b;
  color: #94a3b8;
  border-color: #475569;
}

.copy-btn.copied { color: #4ade80; border-color: #166534; }

.content pre code {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.82rem;
  line-height: 1.65;
  padding: 18px 20px;
  display: block;
  overflow-x: auto;
  color: var(--code-text);
  background: transparent !important;
}

/* ── Table ────────────────────────────────────────────────────────────────── */
.table-wrap {
  overflow-x: auto;
  margin: 20px 0;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
}

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

thead tr {
  background: var(--th-bg);
}

th {
  padding: 10px 16px;
  text-align: left;
  font-weight: 600;
  color: var(--text);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}

td {
  padding: 10px 16px;
  color: var(--text-2);
  border-bottom: 1px solid var(--border-2);
  vertical-align: top;
  line-height: 1.6;
}

tr:last-child td { border-bottom: none; }
tr:hover td { background: #fafafa; }

/* ── Callout Boxes ────────────────────────────────────────────────────────── */
.callout {
  border-radius: var(--radius);
  padding: 14px 18px;
  margin: 20px 0;
  display: flex;
  gap: 12px;
  align-items: flex-start;
  font-size: 13.5px;
  line-height: 1.6;
}

.callout-icon { font-size: 16px; flex-shrink: 0; margin-top: 1px; }

.callout.info {
  background: #eff6ff;
  border-left: 3px solid #3b82f6;
  color: #1e40af;
}

.callout.warn {
  background: #fffbeb;
  border-left: 3px solid #f59e0b;
  color: #92400e;
}

.callout.tip {
  background: #f0fdf4;
  border-left: 3px solid #22c55e;
  color: #166534;
}

/* ── Section Divider ──────────────────────────────────────────────────────── */
.section-anchor {
  display: block;
  height: 0;
  overflow: hidden;
  margin-top: -32px;
  padding-top: 32px;
}

/* ── Part Header ──────────────────────────────────────────────────────────── */
.part-header {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 32px;
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.part-header.light {
  background: #f0fdf4;
  color: #16a34a;
  border: 1px solid #bbf7d0;
}

.part-header.heavy {
  background: #fff7ed;
  color: #c2410c;
  border: 1px solid #fed7aa;
}

/* ── Quick Navigator ──────────────────────────────────────────────────────── */
.quick-nav-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin: 20px 0;
}

.quick-nav-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  text-decoration: none !important;
  color: var(--text-2) !important;
  border-bottom: 1px solid var(--border) !important;
  font-size: 13px;
  transition: all 0.15s;
  background: var(--bg);
}

.quick-nav-item:hover {
  background: #f8fafc;
  border-color: var(--accent) !important;
  color: var(--accent) !important;
}

.quick-nav-item .nav-num {
  font-size: 11px;
  font-weight: 700;
  font-family: 'JetBrains Mono', monospace;
  color: var(--text-3);
  background: var(--border-2);
  padding: 2px 6px;
  border-radius: 3px;
  flex-shrink: 0;
}

/* ── Hub Page: Hero ───────────────────────────────────────────────────────── */
.hub-hero {
  background: var(--sb-bg);
  margin-left: 0;
  padding: 64px 48px 56px;
  border-bottom: 1px solid #1f2937;
}

.hub-hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 11px;
  font-weight: 600;
  color: #60a5fa;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 16px;
  padding: 4px 10px;
  border: 1px solid #1d4ed8;
  background: rgba(59, 130, 246, 0.1);
  border-radius: 20px;
}

.hub-hero h1 {
  font-size: 2.6rem;
  font-weight: 700;
  color: #f9fafb;
  letter-spacing: -0.04em;
  margin-bottom: 12px;
  line-height: 1.1;
}

.hub-hero p {
  font-size: 1.05rem;
  color: #9ca3af;
  max-width: 520px;
  line-height: 1.7;
}

/* ── Hub Page: Project Cards ──────────────────────────────────────────────── */
.hub-content {
  padding: 40px 48px 80px;
  max-width: 1100px;
}

.hub-section-label {
  font-size: 11px;
  font-weight: 700;
  color: var(--text-3);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 20px;
}

.project-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 20px;
  margin-bottom: 48px;
}

.project-card {
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px;
  background: var(--bg);
  box-shadow: var(--shadow-sm);
  transition: all 0.2s;
  cursor: pointer;
  text-decoration: none;
  display: block;
  color: inherit;
}

.project-card:hover {
  box-shadow: var(--shadow);
  border-color: #bfdbfe;
  transform: translateY(-2px);
}

.card-icon {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  margin-bottom: 14px;
  background: linear-gradient(135deg, #3b82f6, #6366f1);
}

.card-name {
  font-size: 14px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 6px;
  font-family: 'JetBrains Mono', monospace;
  letter-spacing: -0.01em;
}

.card-desc {
  font-size: 13px;
  color: var(--text-3);
  line-height: 1.6;
  margin-bottom: 16px;
}

.card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.card-tag {
  font-size: 11px;
  font-weight: 500;
  padding: 3px 8px;
  border-radius: 4px;
  background: var(--border-2);
  color: var(--text-3);
}

.card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 16px;
  padding-top: 14px;
  border-top: 1px solid var(--border-2);
}

.card-link {
  font-size: 12px;
  font-weight: 600;
  color: var(--accent);
  display: flex;
  align-items: center;
  gap: 4px;
  text-decoration: none;
}

.card-status {
  font-size: 11px;
  padding: 2px 8px;
  border-radius: 10px;
  font-weight: 600;
}

.status-stable {
  background: #f0fdf4;
  color: #16a34a;
  border: 1px solid #bbf7d0;
}

/* ── Hamburger (Mobile) ───────────────────────────────────────────────────── */
.hamburger {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  color: var(--text);
}

/* ── Responsive ───────────────────────────────────────────────────────────── */
@media (max-width: 1024px) {
  .sidebar {
    transform: translateX(-100%);
    transition: transform 0.25s;
    z-index: 200;
  }

  .sidebar.open { transform: translateX(0); }

  .main { margin-left: 0; }

  .topbar-logo {
    width: auto;
    background: var(--sb-bg);
    padding: 0 16px;
  }

  .hamburger { display: flex; }

  .content { padding: 32px 24px 64px; }

  .hub-hero { padding: 40px 24px 32px; }
  .hub-content { padding: 24px 24px 48px; }
  .project-grid { grid-template-columns: 1fr; }

  .quick-nav-grid { grid-template-columns: 1fr; }
}

/* ── Hub: no sidebar ──────────────────────────────────────────────────────── */
.hub-layout .topbar-logo { width: 220px; }
.hub-layout .main { margin-left: 0; }

/* ── Highlight.js override ────────────────────────────────────────────────── */
.hljs { background: transparent !important; padding: 0 !important; }