/* ===== DETAIL PAGE — SHARED STYLES ===== */
:root {
  --bg-deep: #0a0a0f;
  --bg-card: #12121a;
  --bg-card-hover: #1a1a28;
  --bg-code: #1e1e2e;
  --text-primary: #e8e6e3;
  --text-secondary: #8b8a97;
  --text-dim: #55546b;
  --accent-blue: #6e9eff;
  --accent-cyan: #56d4c4;
  --accent-orange: #ffa656;
  --accent-pink: #ff6eb4;
  --accent-purple: #b18cff;
  --accent-green: #7dd695;
  --accent-red: #ff6b6b;
  --border: #222233;
  --radius: 16px;
  --radius-sm: 10px;
  --font-display: 'Playfair Display', serif;
  --font-body: 'Noto Sans KR', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
  --nav-bg: rgba(10,10,15,0.82);
  --nav-border: rgba(255,255,255,0.04);
  --surface-line: rgba(255,255,255,0.03);
  --surface-hover: rgba(255,255,255,0.02);
}

[data-theme="light"] {
  --bg-deep: #f4f4fb;
  --bg-card: #ffffff;
  --bg-card-hover: #eeeef8;
  --bg-code: #e8e8f4;
  --text-primary: #18182a;
  --text-secondary: #4a4a6a;
  --text-dim: #8888aa;
  --accent-blue: #4a7ee0;
  --accent-cyan: #1fa890;
  --accent-orange: #e07828;
  --accent-pink: #e04090;
  --accent-purple: #8050e0;
  --accent-green: #2a9640;
  --accent-red: #d94040;
  --border: #dcdcf0;
  --nav-bg: rgba(244,244,251,0.88);
  --nav-border: rgba(0,0,0,0.07);
  --surface-line: rgba(0,0,0,0.04);
  --surface-hover: rgba(0,0,0,0.025);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }
body {
  font-family: var(--font-body);
  background: var(--bg-deep);
  color: var(--text-primary);
  line-height: 1.7;
  font-weight: 300;
  transition: background 0.3s, color 0.3s;
}

::selection { background: rgba(110,158,255,0.3); color: #fff; }
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-deep); }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }

.container { max-width: 1100px; margin: 0 auto; padding: 0 24px; }

/* NAV */
nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  padding: 14px 24px;
  display: flex; justify-content: space-between; align-items: center;
  background: var(--nav-bg); backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--nav-border);
  transition: background 0.3s;
}
.nav-logo {
  font-family: var(--font-mono); font-weight: 700; font-size: 15px;
  text-decoration: none; color: var(--text-primary);
}
.nav-logo span { color: var(--accent-blue); }
.nav-right { display: flex; align-items: center; gap: 10px; }
.nav-back {
  font-family: var(--font-mono); font-size: 12px;
  color: var(--text-secondary); text-decoration: none;
  padding: 6px 14px; border: 1px solid var(--border);
  border-radius: 8px; transition: all 0.2s;
}
.nav-back:hover { color: var(--accent-blue); border-color: var(--accent-blue); }
.theme-toggle {
  display: flex; align-items: center; justify-content: center;
  width: 36px; height: 36px; border-radius: 10px;
  border: 1px solid var(--border); background: var(--surface-hover);
  cursor: pointer; font-size: 16px; transition: all 0.25s; line-height: 1;
}
.theme-toggle:hover { border-color: var(--accent-blue); transform: scale(1.08); }

/* PAGE HEADER */
.page-header { padding: 110px 0 56px; position: relative; overflow: hidden; }
.page-header-bg {
  position: absolute; inset: 0; pointer-events: none;
  background: radial-gradient(ellipse 70% 80% at 5% 50%, var(--glow-a) 0%, transparent 55%),
              radial-gradient(ellipse 50% 60% at 95% 20%, var(--glow-b) 0%, transparent 55%);
}
.breadcrumb {
  font-family: var(--font-mono); font-size: 12px;
  color: var(--text-dim); margin-bottom: 28px;
  display: flex; align-items: center; gap: 8px;
}
.breadcrumb a { color: var(--text-dim); text-decoration: none; transition: color 0.2s; }
.breadcrumb a:hover { color: var(--accent-blue); }
.arch-num-label {
  font-family: var(--font-mono); font-size: 12px; letter-spacing: 3px;
  text-transform: uppercase; margin-bottom: 12px;
}
.page-title {
  font-family: var(--font-display);
  font-size: clamp(42px, 7vw, 84px);
  font-weight: 700; line-height: 1.05;
  letter-spacing: -2px; margin-bottom: 10px;
}
.page-fullname {
  font-family: var(--font-mono); font-size: 15px;
  color: var(--text-dim); margin-bottom: 20px;
}
.page-desc { font-size: 17px; color: var(--text-secondary); max-width: 640px; }

/* OVERVIEW GRID */
.overview-grid {
  display: grid; grid-template-columns: 1fr 1fr 1fr;
  gap: 16px; margin-bottom: 56px;
}
@media (max-width: 860px) { .overview-grid { grid-template-columns: 1fr; } }

.ov-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 28px;
  transition: border-color 0.25s, background 0.25s;
}
.ov-card:hover { border-color: var(--accent-blue); }
.ov-label {
  font-family: var(--font-mono); font-size: 11px; letter-spacing: 2px;
  text-transform: uppercase; color: var(--text-dim); margin-bottom: 16px;
}
.diagram-ascii {
  font-family: var(--font-mono); font-size: 13px;
  line-height: 1.9; color: var(--accent-cyan); white-space: pre;
}
.key-points { list-style: none; }
.key-points li {
  font-size: 14px; color: var(--text-secondary);
  padding: 7px 0; border-bottom: 1px solid var(--surface-line);
  display: flex; gap: 10px; align-items: flex-start;
}
.key-points li:last-child { border-bottom: none; }
.key-points li::before {
  content: '▸'; color: var(--accent-blue);
  font-size: 10px; margin-top: 5px; flex-shrink: 0;
}
.pattern-pills { display: flex; flex-wrap: wrap; gap: 8px; }
.pill {
  font-family: var(--font-mono); font-size: 11px; font-weight: 600;
  padding: 5px 14px; border-radius: 20px; border: 1px solid;
}
.pill.blue   { color: var(--accent-blue);   border-color: var(--accent-blue);   background: rgba(110,158,255,0.08); }
.pill.cyan   { color: var(--accent-cyan);   border-color: var(--accent-cyan);   background: rgba(86,212,196,0.08); }
.pill.orange { color: var(--accent-orange); border-color: var(--accent-orange); background: rgba(255,166,86,0.08); }
.pill.purple { color: var(--accent-purple); border-color: var(--accent-purple); background: rgba(177,140,255,0.08); }
.pill.green  { color: var(--accent-green);  border-color: var(--accent-green);  background: rgba(125,214,149,0.08); }
.pill.pink   { color: var(--accent-pink);   border-color: var(--accent-pink);   background: rgba(255,110,180,0.08); }
.pill-note { font-size: 13px; color: var(--text-secondary); margin-top: 12px; line-height: 1.6; }

/* CODE SECTION */
.code-section { margin-bottom: 56px; }
.section-label {
  font-family: var(--font-mono); font-size: 11px; letter-spacing: 3px;
  text-transform: uppercase; color: var(--text-dim); margin-bottom: 20px;
}
.code-tabs {
  display: flex; border-bottom: 1px solid var(--border); margin-bottom: 0;
}
.code-tab {
  font-family: var(--font-mono); font-size: 13px;
  padding: 10px 24px; cursor: pointer; border: none;
  background: transparent; color: var(--text-dim);
  border-bottom: 2px solid transparent; margin-bottom: -1px;
  transition: all 0.2s;
}
.code-tab.active { color: var(--accent-blue); border-bottom-color: var(--accent-blue); }
.code-tab:hover:not(.active) { color: var(--text-secondary); }
.code-panel { display: none; }
.code-panel.active { display: block; }
.code-file-bar {
  font-family: var(--font-mono); font-size: 12px; color: var(--text-dim);
  padding: 10px 20px; background: var(--bg-card);
  border: 1px solid var(--border); border-bottom: none;
  border-radius: 10px 10px 0 0; margin-top: 16px;
  display: flex; align-items: center; gap: 8px;
}
.code-file-bar .dot { width: 10px; height: 10px; border-radius: 50%; display: inline-block; }
.code-block {
  background: var(--bg-code); border: 1px solid var(--border);
  border-radius: 0 0 10px 10px;
  padding: 24px; overflow-x: auto; margin-bottom: 16px;
  transition: background 0.3s, border-color 0.3s;
}
.code-block pre { margin: 0; }
.code-block code {
  font-family: var(--font-mono); font-size: 13px;
  line-height: 1.8; tab-size: 4;
}
.hljs { background: transparent !important; padding: 0 !important; }

/* CONCEPTS */
.concepts-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-bottom: 56px;
}
@media (max-width: 680px) { .concepts-grid { grid-template-columns: 1fr; } }
.concept-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 24px;
  transition: border-color 0.25s, background 0.25s;
}
.concept-card:hover { border-color: var(--accent-blue); }
.concept-name {
  font-family: var(--font-mono); font-size: 14px; font-weight: 700;
  color: var(--accent-blue); margin-bottom: 8px;
}
.concept-desc { font-size: 14px; color: var(--text-secondary); line-height: 1.75; }

/* COMPARISON BOX */
.compare-box {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); overflow: hidden; margin-bottom: 56px;
}
.compare-row {
  display: grid; grid-template-columns: 140px 1fr 1fr;
  border-bottom: 1px solid var(--surface-line);
}
.compare-row:last-child { border-bottom: none; }
.compare-row.header { background: var(--bg-code); }
.compare-cell {
  padding: 14px 20px; font-size: 14px;
  border-right: 1px solid var(--surface-line);
}
.compare-cell:last-child { border-right: none; }
.compare-row.header .compare-cell {
  font-family: var(--font-mono); font-size: 11px;
  color: var(--text-dim); font-weight: 600; letter-spacing: 1px;
}
.compare-cell.row-label {
  font-family: var(--font-mono); font-size: 12px;
  color: var(--text-dim); font-weight: 600;
}
.compare-cell.bad  { color: var(--accent-red); }
.compare-cell.good { color: var(--accent-green); }

/* PAGE NAV */
.page-nav {
  display: flex; justify-content: space-between; gap: 16px;
  padding: 40px 0 80px; border-top: 1px solid var(--border);
}
.page-nav-btn {
  display: flex; flex-direction: column; gap: 4px;
  text-decoration: none; padding: 16px 24px; min-width: 150px;
  border: 1px solid var(--border); border-radius: var(--radius-sm);
  background: var(--bg-card); transition: all 0.25s;
}
.page-nav-btn:hover { border-color: var(--accent-blue); transform: translateY(-2px); }
.page-nav-btn.right { align-items: flex-end; }
.page-nav-hint { font-family: var(--font-mono); font-size: 11px; color: var(--text-dim); }
.page-nav-name { font-family: var(--font-mono); font-size: 14px; font-weight: 700; color: var(--text-primary); }
.page-nav-spacer { flex: 1; }

.divider { height: 1px; background: var(--border); margin: 48px 0; }