:root {
  --bg: #0d0d0d;
  --bg-card: #161616;
  --bg-elevated: #1e1e1e;
  --text-primary: #e8e6e3;
  --text-secondary: #989898;
  --text-muted: #6b6b6b;
  --accent: #d4a853;
  --accent-dim: #a08040;
  --accent-bg: rgba(212,168,83,0.08);
  --border: #2a2a2a;
  --border-light: #1f1f1f;
  --radius: 6px;
  --font-mono: 'Courier New', monospace;
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --max-width: 1100px;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body { font-family: var(--font-sans); background: var(--bg); color: var(--text-primary); line-height: 1.7; -webkit-font-smoothing: antialiased; }
a { color: var(--accent); text-decoration: none; transition: color 0.15s; }
a:hover { color: var(--accent-dim); }

.nav { border-bottom: 1px solid var(--border); background: rgba(13,13,13,0.92); backdrop-filter: blur(12px); position: sticky; top: 0; z-index: 100; }
.nav-inner { max-width: var(--max-width); margin: 0 auto; display: flex; align-items: center; justify-content: space-between; padding: 14px 24px; }
.nav-logo { font-size: 1.2rem; font-weight: 700; color: var(--text-primary); letter-spacing: -0.02em; }
.nav-logo span { color: var(--accent); }
.nav-links { display: flex; gap: 28px; align-items: center; }
.nav-links a { color: var(--text-secondary); font-size: 0.9rem; font-weight: 500; }
.nav-links a:hover { color: var(--text-primary); }
.nav-links a.active { color: var(--accent); }

.hero { max-width: var(--max-width); margin: 0 auto; padding: 80px 24px 64px; text-align: center; }
.hero-tag { display: inline-block; font-size: 0.78rem; font-weight: 600; color: var(--accent); letter-spacing: 0.06em; text-transform: uppercase; background: var(--accent-bg); padding: 5px 14px; border-radius: 4px; margin-bottom: 24px; }
.hero h1 { font-size: 3rem; font-weight: 800; letter-spacing: -0.03em; line-height: 1.15; margin-bottom: 16px; }
.hero h1 span { color: var(--accent); }
.hero-sub { font-size: 1.15rem; color: var(--text-secondary); max-width: 640px; margin: 0 auto 32px; }
.hero-quote { font-style: italic; color: var(--text-muted); font-size: 0.92rem; margin-bottom: 36px; }
.btn { display: inline-flex; align-items: center; gap: 8px; padding: 11px 24px; border-radius: var(--radius); font-weight: 600; font-size: 0.92rem; transition: all 0.15s; cursor: pointer; border: none; }
.btn-primary { background: var(--accent); color: #0d0d0d; }
.btn-primary:hover { background: var(--accent-dim); color: #0d0d0d; }
.btn-secondary { background: transparent; color: var(--accent); border: 1px solid var(--accent); margin-left: 12px; }
.btn-secondary:hover { background: var(--accent-bg); color: var(--accent); }
.btn-primary:disabled { opacity: 0.6; cursor: not-allowed; }

.section { max-width: var(--max-width); margin: 0 auto; padding: 64px 24px; }
.section-header { text-align: center; margin-bottom: 48px; }
.section-header h2 { font-size: 1.9rem; font-weight: 700; letter-spacing: -0.02em; margin-bottom: 8px; }
.section-header p { color: var(--text-secondary); font-size: 1rem; }

.track-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 20px; }
.track-card { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); padding: 28px; text-align: center; }
.track-card .year { font-size: 0.8rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.06em; margin-bottom: 8px; }
.track-card .pct { font-size: 2.6rem; font-weight: 800; color: var(--accent); line-height: 1.1; }
.track-card .label { font-size: 0.85rem; color: var(--text-secondary); margin-top: 6px; }
.track-card .beat { font-size: 0.8rem; color: var(--text-muted); margin-top: 10px; }

.why-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: 20px; }
.why-card { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); padding: 28px; }
.why-card .num { font-family: var(--font-mono); font-size: 0.75rem; color: var(--accent); margin-bottom: 8px; }
.why-card h3 { font-size: 1.05rem; font-weight: 600; margin-bottom: 8px; }
.why-card p { font-size: 0.9rem; color: var(--text-secondary); line-height: 1.6; }

.skills-section { border-top: 1px solid var(--border); }
.skill-cat { margin-bottom: 36px; }
.skill-cat h3 { font-size: 0.85rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.06em; margin-bottom: 14px; }
.skill-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 12px; }
.skill-item { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); padding: 18px 20px; transition: border-color 0.15s; }
.skill-item:hover { border-color: var(--accent-dim); }
.skill-item h4 { font-size: 0.92rem; font-weight: 600; margin-bottom: 4px; }
.skill-item p { font-size: 0.82rem; color: var(--text-secondary); }

.report-search { margin-bottom: 32px; }
.report-search input { width: 100%; padding: 12px 18px; background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); color: var(--text-primary); font-size: 0.95rem; outline: none; }
.report-search input:focus { border-color: var(--accent); }
.report-search input::placeholder { color: var(--text-muted); }
.report-count { font-size: 0.82rem; color: var(--text-muted); margin-bottom: 20px; }
.report-list { display: flex; flex-direction: column; gap: 4px; }
.report-item { display: flex; align-items: center; justify-content: space-between; padding: 14px 18px; border-radius: var(--radius); transition: background 0.1s; color: var(--text-primary); }
.report-item:hover { background: var(--bg-card); }
.report-info { flex: 1; min-width: 0; }
.report-item .report-name { font-weight: 500; font-size: 0.92rem; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.report-item .report-date { font-size: 0.78rem; color: var(--text-muted); white-space: nowrap; }
.report-tags { display: flex; gap: 6px; margin-top: 4px; flex-wrap: wrap; }
.report-tags span { font-size: 0.7rem; padding: 2px 8px; background: var(--accent-bg); color: var(--accent); border-radius: 3px; }
.report-arrow { color: var(--text-muted); font-size: 0.85rem; flex-shrink: 0; margin-left: 12px; }

.report-body { max-width: 780px; margin: 0 auto; padding: 40px 24px 80px; font-size: 0.95rem; line-height: 1.8; }
.report-body h1 { font-size: 2rem; font-weight: 700; margin-bottom: 12px; letter-spacing: -0.02em; }
.report-body h2 { font-size: 1.35rem; font-weight: 600; margin-top: 36px; margin-bottom: 12px; padding-bottom: 8px; border-bottom: 1px solid var(--border-light); }
.report-body h3 { font-size: 1.1rem; font-weight: 600; margin-top: 28px; margin-bottom: 8px; }
.report-body h4 { font-size: 1rem; font-weight: 600; margin-top: 20px; margin-bottom: 6px; color: var(--text-secondary); }
.report-body p { margin-bottom: 14px; }
.report-body blockquote { border-left: 3px solid var(--accent); padding: 8px 16px; margin: 16px 0; background: var(--accent-bg); border-radius: 0 var(--radius) var(--radius) 0; color: var(--text-secondary); }
.report-body code { font-family: var(--font-mono); font-size: 0.85em; background: var(--bg-elevated); padding: 2px 6px; border-radius: 3px; }
.report-body pre { background: var(--bg-elevated); padding: 16px 20px; border-radius: var(--radius); overflow-x: auto; margin: 16px 0; font-size: 0.85rem; border: 1px solid var(--border); }
.report-body pre code { background: none; padding: 0; }
.report-body table { width: 100%; border-collapse: collapse; margin: 20px 0; font-size: 0.88rem; }
.report-body th { text-align: left; padding: 10px 14px; background: var(--bg-elevated); font-weight: 600; border-bottom: 2px solid var(--border); color: var(--text-primary); white-space: nowrap; }
.report-body td { padding: 10px 14px; border-bottom: 1px solid var(--border-light); color: var(--text-secondary); }
.report-body tr:hover td { background: var(--bg-card); }
.report-body ul, .report-body ol { margin: 12px 0 12px 24px; }
.report-body li { margin-bottom: 6px; }
.report-body hr { border: none; border-top: 1px solid var(--border); margin: 36px 0; }
.report-body strong { color: var(--text-primary); }
.report-body img { max-width: 100%; border-radius: var(--radius); margin: 16px 0; }

.report-back { max-width: 780px; margin: 0 auto; padding: 24px 24px 0; }
.report-back a { font-size: 0.88rem; color: var(--text-muted); }
.report-back a:hover { color: var(--accent); }

.footer { border-top: 1px solid var(--border); padding: 40px 24px; text-align: center; color: var(--text-muted); font-size: 0.82rem; }
.footer a { color: var(--text-secondary); }
.footer a:hover { color: var(--accent); }

.arch-img { max-width: 100%; margin: 24px auto; display: block; border-radius: var(--radius); }

/* Query Page */
.query-layout { display: grid; grid-template-columns: 400px 1fr; gap: 32px; align-items: start; max-width: var(--max-width); margin: 0 auto; }
.query-form { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); padding: 28px; }
.query-field { margin-bottom: 20px; }
.query-label { display: block; font-size: 0.8rem; font-weight: 600; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.05em; margin-bottom: 8px; }
.query-select, .query-input { width: 100%; padding: 10px 14px; background: var(--bg-elevated); border: 1px solid var(--border); border-radius: var(--radius); color: var(--text-primary); font-size: 0.92rem; outline: none; font-family: var(--font-sans); transition: border-color 0.15s; }
.query-select:focus, .query-input:focus { border-color: var(--accent); }
.query-select::placeholder, .query-input::placeholder { color: var(--text-muted); }
.query-skill-desc { font-size: 0.8rem; color: var(--text-muted); margin-top: 8px; line-height: 1.55; }
.query-preview { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; position: sticky; top: 80px; }
.query-preview-header { display: flex; align-items: center; justify-content: space-between; padding: 12px 18px; border-bottom: 1px solid var(--border); font-size: 0.82rem; font-weight: 600; color: var(--text-secondary); }
.btn-copy { background: transparent; border: 1px solid var(--border); color: var(--text-secondary); padding: 4px 12px; border-radius: 4px; font-size: 0.78rem; cursor: pointer; transition: all 0.15s; }
.btn-copy:hover { border-color: var(--accent); color: var(--accent); }
.query-model-select { background: var(--bg); border: 1px solid var(--border); color: var(--text-secondary); padding: 3px 8px; border-radius: 4px; font-size: 0.75rem; cursor: pointer; outline: none; }
.query-model-select:focus { border-color: var(--accent); }
.query-placeholder { color: var(--text-muted); padding: 40px 20px; text-align: center; font-size: 0.9rem; }
.query-result-area { padding: 20px; max-height: 65vh; overflow-y: auto; background: var(--bg); }
.query-result-area h1 { font-size: 1.4rem; margin-bottom: 12px; }
.query-result-area h2 { font-size: 1.15rem; margin-top: 24px; margin-bottom: 10px; padding-bottom: 6px; border-bottom: 1px solid var(--border-light); }
.query-result-area h3 { font-size: 1rem; margin-top: 18px; margin-bottom: 8px; color: var(--accent); }
.query-result-area p { margin-bottom: 10px; line-height: 1.75; font-size: 0.9rem; }
.query-result-area strong { color: var(--text-primary); }
.query-result-area ul { margin: 8px 0 8px 20px; }
.query-result-area li { margin-bottom: 4px; }
.query-error { color: #e06060; padding: 20px; font-size: 0.88rem; line-height: 1.6; }
.query-loading { padding: 40px; text-align: center; color: var(--text-muted); }
.loading-spinner { width: 32px; height: 32px; margin: 0 auto 16px; border: 3px solid var(--border); border-top-color: var(--accent); border-radius: 50%; animation: spin 0.8s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }
.md-row { display: flex; padding: 6px 0; border-bottom: 1px solid var(--border-light); }
.md-th { font-weight: 600; color: var(--text-primary); flex: 1; font-size: 0.85rem; }
.md-td { color: var(--text-secondary); flex: 1; font-size: 0.85rem; }

.skill-detail { max-width: 780px; margin: 0 auto; padding: 40px 24px 80px; }
.skill-detail h1 { font-size: 1.8rem; font-weight: 700; margin-bottom: 8px; }
.skill-detail .skill-desc { color: var(--text-secondary); font-size: 1.05rem; margin-bottom: 32px; }
.skill-detail .skill-meta { display: flex; gap: 24px; margin-bottom: 32px; font-size: 0.85rem; color: var(--text-muted); }
.skill-detail .skill-meta span { display: flex; align-items: center; gap: 6px; }

@media (max-width: 860px) {
  .query-layout { grid-template-columns: 1fr; }
  .query-preview { position: static; }
  .query-result-area { max-height: none; }
}
@media (max-width: 768px) {
  .hero { padding: 48px 20px 40px; }
  .hero h1 { font-size: 2rem; }
  .hero-sub { font-size: 1rem; }
  .section { padding: 40px 20px; }
  .section-header h2 { font-size: 1.5rem; }
  .nav-links { gap: 16px; }
  .btn-secondary { margin-left: 0; margin-top: 10px; }
  .track-grid { grid-template-columns: 1fr 1fr; }
  .why-grid { grid-template-columns: 1fr; }
  .skill-grid { grid-template-columns: 1fr; }
}