/* =============================================
   STABLE MATCHING — STYLES
   Aesthetic: Industrial-Academic Brutalism
   ============================================= */

:root {
  --bg: #0e0e10;
  --bg2: #141416;
  --bg3: #1c1c1f;
  --surface: #1f1f23;
  --border: #2e2e34;
  --border2: #3a3a42;

  --ink: #f0ede8;
  --ink2: #a8a5a0;
  --ink3: #6a6760;

  --accent-a: #e8f54e;   /* applicant: acid yellow */
  --accent-e: #4ef5c8;   /* employer: mint */
  --accent-diff: #f54e7a; /* diff: hot pink */
  --accent-neutral: #7a7aff;

  --font-display: 'Syne', sans-serif;
  --font-mono: 'DM Mono', monospace;
  --font-body: 'DM Sans', sans-serif;

  --r: 4px;
  --r2: 8px;
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.6;
  overflow-x: hidden;
}

.noise {
  position: fixed; inset: 0; pointer-events: none; z-index: 999;
  opacity: 0.028;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)'/%3E%3C/svg%3E");
}

/* ─── HEADER ─── */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(14,14,16,0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.header-inner {
  max-width: 1200px; margin: 0 auto;
  padding: 0 24px;
  height: 60px;
  display: flex; align-items: center; gap: 32px;
}
.logo {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 13px;
  letter-spacing: 0.12em;
  white-space: nowrap;
}
.logo-bracket { color: var(--accent-a); }
.logo-text { color: var(--ink); margin: 0 6px; }
.header-nav {
  display: flex; gap: 20px;
  margin-left: auto;
}
.nav-link {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--ink3);
  text-decoration: none;
  text-transform: uppercase;
  transition: color 0.2s;
}
.nav-link:hover { color: var(--accent-a); }
.header-badge {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--ink3);
  border: 1px solid var(--border2);
  padding: 4px 10px;
  border-radius: 20px;
  display: flex; align-items: center; gap: 6px;
  white-space: nowrap;
}
.badge-dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--accent-e);
  box-shadow: 0 0 8px var(--accent-e);
  animation: pulse 2s infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

/* ─── HERO ─── */
.hero {
  min-height: calc(100vh - 60px);
  display: flex; align-items: center;
  padding: 80px 24px;
  max-width: 1200px; margin: 0 auto;
}
.hero-grid {
  display: grid;
  grid-template-columns: 1fr 460px;
  gap: 80px; align-items: center;
  width: 100%;
}
.hero-tag {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent-a);
  margin-bottom: 24px;
}
.hero-title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(52px, 6vw, 88px);
  line-height: 0.95;
  letter-spacing: -0.02em;
  color: var(--ink);
  margin-bottom: 28px;
}
.hero-title em {
  font-style: normal;
  color: transparent;
  -webkit-text-stroke: 2px var(--accent-a);
}
.hero-desc {
  font-size: 16px;
  color: var(--ink2);
  max-width: 440px;
  line-height: 1.7;
  margin-bottom: 32px;
}
.hero-authors {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--ink3);
  letter-spacing: 0.05em;
  display: flex; gap: 8px; align-items: center;
}
.sep { color: var(--border2); }
.hero-diagram canvas {
  width: 100%; height: auto;
  border: 1px solid var(--border);
  border-radius: var(--r2);
}

/* ─── SECTIONS ─── */
.section-inner {
  max-width: 1200px; margin: 0 auto;
  padding: 80px 24px;
}
.section-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink3);
  margin-bottom: 12px;
}
.section-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(28px, 3.5vw, 44px);
  letter-spacing: -0.02em;
  color: var(--ink);
  margin-bottom: 48px;
}

/* ─── CONFIG ─── */
.section-config { background: var(--bg2); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }

.config-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-bottom: 40px;
}
.config-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r2);
  padding: 20px;
  transition: border-color 0.2s;
}
.config-card:hover { border-color: var(--border2); }
.config-card.span2 { grid-column: span 2; }

.cfg-label {
  display: flex; justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--ink2);
  letter-spacing: 0.06em;
  margin-bottom: 14px;
}
.cfg-val {
  color: var(--accent-a);
  font-weight: 500;
}

.slider {
  -webkit-appearance: none;
  width: 100%; height: 3px;
  background: var(--border2);
  border-radius: 2px;
  outline: none;
}
.slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 16px; height: 16px;
  border-radius: 50%;
  background: var(--accent-a);
  cursor: pointer;
  box-shadow: 0 0 10px rgba(232,245,78,0.4);
  transition: transform 0.15s;
}
.slider::-webkit-slider-thumb:hover { transform: scale(1.3); }

.mode-tabs { display: flex; gap: 8px; flex-wrap: wrap; }
.mode-tab {
  font-family: var(--font-mono);
  font-size: 12px;
  padding: 8px 16px;
  border: 1px solid var(--border2);
  background: transparent;
  color: var(--ink3);
  border-radius: var(--r);
  cursor: pointer;
  transition: all 0.2s;
  letter-spacing: 0.04em;
}
.mode-tab:hover { border-color: var(--accent-a); color: var(--accent-a); }
.mode-tab.active { background: var(--accent-a); border-color: var(--accent-a); color: var(--bg); font-weight: 500; }

.run-btn {
  display: flex; align-items: center; gap: 12px;
  background: var(--accent-a);
  color: var(--bg);
  border: none;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.01em;
  padding: 18px 48px;
  border-radius: var(--r2);
  cursor: pointer;
  transition: all 0.2s;
  position: relative;
  overflow: hidden;
}
.run-btn::after {
  content: '';
  position: absolute; inset: 0;
  background: rgba(255,255,255,0);
  transition: background 0.15s;
}
.run-btn:hover { transform: translateY(-2px); box-shadow: 0 12px 32px rgba(232,245,78,0.3); }
.run-btn:hover::after { background: rgba(255,255,255,0.08); }
.run-btn:active { transform: translateY(0); }
.run-btn.loading { pointer-events: none; opacity: 0.7; }
.run-icon { font-size: 14px; }

/* ─── RESULTS ─── */
.section-results { border-top: 1px solid var(--border); }
.hidden { display: none !important; }

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-bottom: 48px;
}
.stat-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r2);
  padding: 24px;
  position: relative;
  overflow: hidden;
}
.stat-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
}
.stat-card.ac::before { background: var(--accent-a); }
.stat-card.em::before { background: var(--accent-e); }
.stat-card.diff::before { background: var(--accent-diff); }
.stat-card.neutral::before { background: var(--accent-neutral); }

.stat-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink3);
  margin-bottom: 10px;
}
.stat-value {
  font-family: var(--font-display);
  font-size: 36px;
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1;
  margin-bottom: 6px;
}
.stat-card.ac .stat-value { color: var(--accent-a); }
.stat-card.em .stat-value { color: var(--accent-e); }
.stat-card.diff .stat-value { color: var(--accent-diff); }
.stat-card.neutral .stat-value { color: var(--accent-neutral); }
.stat-sub {
  font-size: 12px;
  color: var(--ink3);
  font-family: var(--font-mono);
}

/* ─── COMPARISON PANELS ─── */
.comparison-wrap {
  display: grid;
  grid-template-columns: 1fr 60px 1fr;
  gap: 0;
  align-items: start;
}
.comparison-panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r2);
  padding: 28px;
}
.panel-header {
  display: flex; align-items: center; gap: 12px;
  margin-bottom: 24px;
}
.panel-badge {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.1em;
  padding: 4px 10px;
  border-radius: 3px;
}
.applicant-badge { background: rgba(232,245,78,0.12); color: var(--accent-a); border: 1px solid rgba(232,245,78,0.3); }
.employer-badge  { background: rgba(78,245,200,0.12); color: var(--accent-e);  border: 1px solid rgba(78,245,200,0.3); }

.panel-title { font-family: var(--font-mono); font-size: 13px; color: var(--ink2); }

.vs-divider {
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 800;
  color: var(--accent-diff);
  padding-top: 60px;
}

/* Rank bars */
.rank-bar-row {
  display: grid;
  grid-template-columns: 80px 1fr 36px;
  align-items: center;
  gap: 10px;
  margin-bottom: 8px;
}
.rank-bar-label {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--ink3);
  text-overflow: ellipsis;
  overflow: hidden;
  white-space: nowrap;
}
.rank-bar-track {
  height: 6px;
  background: var(--border);
  border-radius: 3px;
  overflow: hidden;
}
.rank-bar-fill {
  height: 100%;
  border-radius: 3px;
  transition: width 0.6s cubic-bezier(0.4,0,0.2,1);
}
.applicant-fill { background: var(--accent-a); }
.employer-fill  { background: var(--accent-e); }
.rank-bar-num {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--ink2);
  text-align: right;
}

.blocking-info {
  margin-top: 32px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r2);
  padding: 20px 24px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--ink2);
  line-height: 1.8;
}
.blocking-ok { color: var(--accent-e); }
.blocking-fail { color: var(--accent-diff); }

/* ─── GRAPH ─── */
.section-graph { background: var(--bg2); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }

.graph-controls { display: flex; gap: 10px; margin-bottom: 28px; }
.gc-btn {
  font-family: var(--font-mono);
  font-size: 12px;
  padding: 8px 20px;
  border: 1px solid var(--border2);
  background: transparent;
  color: var(--ink3);
  border-radius: var(--r);
  cursor: pointer;
  transition: all 0.2s;
  letter-spacing: 0.05em;
}
.gc-btn:hover { border-color: var(--ink2); color: var(--ink); }
.gc-btn.active { background: var(--surface); border-color: var(--accent-neutral); color: var(--accent-neutral); }

.graph-wrap {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r2);
  overflow: hidden;
  width: 100%;
}
.graph-wrap canvas {
  width: 100%;
  height: auto;
  display: block;
}

.graph-legend {
  display: flex; gap: 24px; margin-top: 20px; flex-wrap: wrap;
}
.leg-item {
  display: flex; align-items: center; gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--ink3);
}
.leg-dot {
  width: 10px; height: 10px;
  border-radius: 50%;
}
.applicant-dot { background: var(--accent-a); }
.employer-dot  { background: var(--accent-e); }
.leg-line { display: inline-block; width: 24px; height: 2px; }
.match-line { background: var(--ink2); }
.diff-line { background: var(--accent-diff); }

/* ─── PREFERENCE TABLE ─── */
.section-table { border-top: 1px solid var(--border); }
.table-tabs { display: flex; gap: 8px; margin-bottom: 24px; }
.tt-btn {
  font-family: var(--font-mono);
  font-size: 12px;
  padding: 8px 18px;
  border: 1px solid var(--border2);
  background: transparent;
  color: var(--ink3);
  border-radius: var(--r);
  cursor: pointer;
  transition: all 0.2s;
}
.tt-btn:hover { color: var(--ink2); }
.tt-btn.active { background: var(--surface); color: var(--ink); border-color: var(--accent-neutral); }

.table-wrap {
  overflow-x: auto;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r2);
}
.pref-table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--font-mono);
  font-size: 12px;
}
.pref-table th {
  background: var(--bg3);
  color: var(--ink3);
  font-weight: 500;
  padding: 12px 16px;
  text-align: left;
  border-bottom: 1px solid var(--border);
  letter-spacing: 0.06em;
  white-space: nowrap;
}
.pref-table td {
  padding: 10px 16px;
  border-bottom: 1px solid var(--border);
  color: var(--ink2);
  vertical-align: top;
}
.pref-table tr:last-child td { border-bottom: none; }
.pref-table tr:hover td { background: rgba(255,255,255,0.02); }
.rank-1 { color: var(--accent-a); font-weight: 500; }
.rank-2 { color: var(--accent-e); }
.rank-3 { color: var(--ink2); }

/* ─── THEORY ─── */
.section-theory { border-top: 1px solid var(--border); }
.theory-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.theory-card {
  padding: 28px;
  border: 1px solid var(--border);
  border-radius: var(--r2);
  transition: border-color 0.2s, transform 0.2s;
}
.theory-card:hover { border-color: var(--border2); transform: translateY(-3px); }
.theory-num {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--accent-a);
  letter-spacing: 0.1em;
  margin-bottom: 12px;
}
.theory-card h3 {
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 12px;
}
.theory-card p {
  font-size: 13px;
  color: var(--ink3);
  line-height: 1.7;
}

/* ─── FOOTER ─── */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 28px 24px;
}
.footer-inner {
  max-width: 1200px; margin: 0 auto;
  display: flex; justify-content: space-between; align-items: center;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--ink3);
  letter-spacing: 0.06em;
}

/* ─── RESPONSIVE ─── */
@media (max-width: 1024px) {
  .hero-grid { grid-template-columns: 1fr; }
  .hero-diagram { display: none; }
  .config-grid { grid-template-columns: repeat(2, 1fr); }
  .theory-grid { grid-template-columns: repeat(2, 1fr); }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .comparison-wrap { grid-template-columns: 1fr; gap: 16px; }
  .vs-divider { padding-top: 0; }
  .header-nav { display: none; }
}
@media (max-width: 600px) {
  .config-grid { grid-template-columns: 1fr; }
  .config-card.span2 { grid-column: 1; }
  .theory-grid { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: 1fr 1fr; }
  .hero-title { font-size: 44px; }
}