/* ============================================================
   styles.css — Tracking Conversations Research Website
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800;900&family=JetBrains+Mono:wght@400;600&display=swap');

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

:root {
  /* Core palette */
  --slate-900:  #0f172a;
  --slate-800:  #1e293b;
  --slate-700:  #334155;
  --slate-600:  #475569;
  --slate-500:  #64748b;
  --slate-400:  #94a3b8;
  --slate-200:  #e2e8f0;
  --slate-100:  #f1f5f9;
  --slate-300:  #cbd5e1;
  --slate-50:   #f8fafc;
  --white:      #ffffff;

  /* Accent — amber/orange, warm and distinctive */
  --accent:     #f59e0b;
  --accent-dim: rgba(245,158,11,0.12);
  --accent-hover:#d97706;

  /* Semantic */
  --danger:     #ef4444;
  --danger-bg:  rgba(239,68,68,0.08);
  --warn:       #f97316;
  --warn-bg:    rgba(249,115,22,0.08);
  --safe:       #10b981;
  --safe-bg:    rgba(16,185,129,0.08);

  /* Data viz */
  --adv-color:  #f43f5e;
  --ana-color:  #6366f1;
  --oth-color:  #64748b;
  --bot-color:  #0f172a;

  /* Type */
  --sans:  'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --mono:  'JetBrains Mono', 'SFMono-Regular', Consolas, monospace;

  --max-w:  1140px;
  --nav-h:  56px;
}

html { scroll-behavior: smooth; font-size: 16px; }

body {
  font-family: var(--sans);
  background: var(--white);
  color: var(--slate-900);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-hover); text-decoration: underline; }

strong { font-weight: 600; }
em { font-style: italic; }

/* ── Skip link ────────────────────────────────────────────── */
.skip-link {
  position: absolute;
  top: -100px;
  left: 1rem;
  background: var(--accent);
  color: var(--slate-900);
  padding: 10px 20px;
  font-weight: 700;
  font-size: 0.95rem;
  border-radius: 0 0 8px 8px;
  z-index: 10000;
  transition: top 0.15s;
  text-decoration: none;
}
.skip-link:focus { top: 0; }

/* ── Focus styles ─────────────────────────────────────────── */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 3px;
}
:focus:not(:focus-visible) { outline: none; }

code, kbd {
  font-family: var(--mono);
  font-size: 0.82em;
  background: var(--slate-100);
  color: var(--slate-800);
  padding: 0.1em 0.4em;
  border-radius: 4px;
  border: 1px solid var(--slate-200);
}

/* ── Layout ───────────────────────────────────────────────── */
.container { max-width: var(--max-w); margin: 0 auto; padding: 0 28px; }

section { padding: 80px 0; }
section + section { border-top: 1px solid var(--slate-200); }

/* ── Navigation ───────────────────────────────────────────── */
#site-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--nav-h);
  background: rgba(15,23,42,0.96);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(255,255,255,0.06);
}

#site-nav .container {
  display: flex;
  align-items: center;
  height: 100%;
  gap: 0;
}

#site-nav .nav-brand {
  font-size: 0.875rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  margin-right: 24px;
  white-space: nowrap;
  flex-shrink: 0;
}

#site-nav nav {
  display: flex;
  gap: 0;
  flex-wrap: nowrap;
  overflow-x: auto;
  -ms-overflow-style: none;
  scrollbar-width: none;
  margin-right: auto;
}
#site-nav nav::-webkit-scrollbar { display: none; }

#site-nav nav a {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--slate-400);
  padding: 0 14px;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  white-space: nowrap;
  transition: color 0.15s;
  border-bottom: 2px solid transparent;
  letter-spacing: 0.01em;
}

#site-nav nav a:hover,
#site-nav nav a.active {
  color: var(--accent);
  text-decoration: none;
  border-bottom-color: var(--accent);
}

/* ── Hero ─────────────────────────────────────────────────── */
#hero {
  background: var(--slate-900);
  padding: 0;
  position: relative;
  overflow: hidden;
}

/* Subtle grid background */
#hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(245,158,11,0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(245,158,11,0.04) 1px, transparent 1px);
  background-size: 48px 48px;
  pointer-events: none;
}

/* Glow */
#hero::after {
  content: '';
  position: absolute;
  top: -200px;
  right: -200px;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(245,158,11,0.08) 0%, transparent 70%);
  pointer-events: none;
}

.hero-inner {
  position: relative;
  z-index: 1;
  padding: 80px 0 72px;
}

.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  background: rgba(245,158,11,0.1);
  border: 1px solid rgba(245,158,11,0.25);
  padding: 5px 12px;
  border-radius: 100px;
  margin-bottom: 28px;
}

#hero h1 {
  font-size: clamp(2rem, 4.5vw, 3.2rem);
  font-weight: 900;
  line-height: 1.1;
  color: var(--white);
  max-width: 860px;
  margin-bottom: 24px;
  letter-spacing: -0.03em;
}

#hero h1 .title-highlight {
  color: var(--accent);
}

.hero-meta {
  margin-bottom: 32px;
}

.hero-authors {
  font-size: 0.95rem;
  color: var(--slate-400);
  margin-bottom: 4px;
  font-weight: 400;
}

.hero-affiliation {
  font-size: 0.82rem;
  color: var(--slate-600);
}

.hero-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 64px;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-family: var(--sans);
  font-size: 0.9rem;
  font-weight: 600;
  padding: 12px 22px;
  border-radius: 8px;
  border: 1.5px solid transparent;
  cursor: pointer;
  transition: all 0.15s;
  text-decoration: none;
  letter-spacing: 0.01em;
}

.btn-primary {
  background: var(--accent);
  color: var(--slate-900);
  border-color: var(--accent);
}
.btn-primary:hover {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
  text-decoration: none;
  color: var(--slate-900);
}

.btn-ghost {
  background: rgba(255,255,255,0.06);
  color: var(--slate-400);
  border-color: rgba(255,255,255,0.1);
}
.btn-ghost:hover {
  background: rgba(255,255,255,0.1);
  color: var(--white);
  text-decoration: none;
}

/* Stats grid — inside dark hero */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 1px;
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: 12px;
  overflow: hidden;
}

.stat-cell {
  background: rgba(255,255,255,0.03);
  padding: 24px 20px;
  text-align: center;
  transition: background 0.15s;
}
.stat-cell:hover { background: rgba(245,158,11,0.06); }

.stat-num {
  font-size: clamp(1.8rem, 3vw, 2.6rem);
  font-weight: 900;
  color: var(--accent);
  line-height: 1;
  margin-bottom: 8px;
  letter-spacing: -0.02em;
}

.stat-num sup {
  font-size: 0.5em;
  font-weight: 700;
  vertical-align: super;
  margin-left: 1px;
}

.stat-desc {
  font-size: 0.875rem;
  color: var(--slate-400);
  line-height: 1.4;
}

/* ── Section headers ──────────────────────────────────────── */
.section-header { margin-bottom: 40px; }

.section-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 12px;
}

.section-eyebrow::before {
  content: '';
  display: block;
  width: 20px;
  height: 2px;
  background: var(--accent);
  border-radius: 1px;
}

.section-title {
  font-size: clamp(1.5rem, 2.8vw, 2.1rem);
  font-weight: 800;
  letter-spacing: -0.025em;
  line-height: 1.2;
  color: var(--slate-900);
  margin-bottom: 14px;
}

.section-desc {
  font-size: 1rem;
  color: var(--slate-600);
  max-width: 640px;
  line-height: 1.7;
}

/* ── Abstract ─────────────────────────────────────────────── */
#abstract { background: var(--slate-50); }

.abstract-body {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 60px;
  align-items: start;
}

.abstract-text {
  font-size: 1.05rem;
  line-height: 1.85;
  color: var(--slate-700);
}

.abstract-text p + p { margin-top: 16px; }

.abstract-sidebar {
  display: flex;
  flex-direction: column;
  gap: 12px;
  position: sticky;
  top: calc(var(--nav-h) + 24px);
}

.finding-card {
  background: var(--white);
  border: 1px solid var(--slate-200);
  border-radius: 10px;
  padding: 16px 18px;
  border-left: 3px solid var(--accent);
  box-shadow: 0 1px 3px rgba(0,0,0,0.04);
}

.finding-card .fc-label {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--slate-400);
  margin-bottom: 6px;
}

.finding-card .fc-text {
  font-size: 0.95rem;
  color: var(--slate-700);
  line-height: 1.5;
  font-weight: 500;
}

/* ── Tracking Matrix ──────────────────────────────────────── */
.matrix-scroll {
  overflow-x: auto;
  border-radius: 12px;
  border: 1px solid var(--slate-200);
  box-shadow: 0 1px 4px rgba(0,0,0,0.04);
}

#matrix-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.78rem;
  min-width: 1020px;
  table-layout: fixed;
}

#matrix-table th, #matrix-table td {
  border: 1px solid var(--slate-200);
  padding: 0;
  text-align: center;
}

#matrix-table .row-header {
  text-align: left;
  padding: 10px 14px;
  font-weight: 600;
  font-size: 0.78rem;
  background: var(--slate-50);
  white-space: nowrap;
  min-width: 140px;
  cursor: pointer;
  user-select: none;
  position: sticky;
  left: 0;
  z-index: 2;
}

#matrix-table .row-header:hover { background: var(--slate-100); }

.row-expand-icon {
  float: right;
  color: var(--slate-400);
  font-size: 0.8rem;
  transition: transform 0.2s;
}

.row-category {
  display: block;
  font-size: 0.72rem;
  font-weight: 500;
  color: var(--slate-400);
  text-transform: uppercase;
  letter-spacing: 0.07em;
  margin-top: 2px;
}

#matrix-table {
  table-layout: fixed;
  width: 100%;
}

#matrix-table .col-header {
  font-size: 0.68rem;
  font-weight: 600;
  padding: 8px 0;
  background: var(--slate-50);
  writing-mode: vertical-rl;
  transform: rotate(180deg);
  height: 100px;
  vertical-align: bottom;
  color: var(--slate-700);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  width: 44px;
}

.private-badge {
  font-size: 0.7rem;
  color: var(--accent);
  writing-mode: horizontal-tb;
  transform: none;
}

/* Colors match paper: cbgreen=#009E73, cborange=#E69F00, cbred=#D55E00 */
.matrix-cell {
  width: 44px;
  min-height: 38px;
  position: relative;
  text-align: center;
  vertical-align: middle;
}
.matrix-cell.scope-third { background: rgba(213,94,0,0.10); }
.matrix-cell.scope-first { background: rgba(0,158,115,0.10); }
.matrix-cell.scope-both  { background: rgba(230,159,0,0.13); }
.matrix-cell.scope-none  { background: var(--white); }

/* Paper-style: plain colored letters, no badge boxes */
.cell-channels {
  display: flex;
  flex-wrap: nowrap;
  gap: 1px;
  justify-content: center;
  align-items: center;
  min-height: 38px;
  padding: 2px;
}

.ch-letter {
  font-family: var(--mono);
  font-size: 0.6rem;
  font-weight: 800;
  line-height: 1;
}
.ch-U { color: #1d4ed8; }
.ch-B { color: #065f46; }
.ch-H { color: #92400e; }
.ch-C { color: #9d174d; }

/* ✗ for not-observed cells */
.xmark {
  font-size: 0.75rem;
  color: var(--slate-300);
  line-height: 38px;
}

.expand-row td { padding: 0; border-top: none; }

.expand-content {
  display: none;
  padding: 14px 18px;
  background: var(--slate-50);
  border-top: 1px dashed var(--slate-200);
  font-size: 0.82rem;
  color: var(--slate-600);
  text-align: left;
  line-height: 1.65;
}

.expand-row.open .expand-content { display: block; }
.row-header.open .row-expand-icon { transform: rotate(90deg); }

/* Matrix legend */
.matrix-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 20px;
  font-size: 0.875rem;
  color: var(--slate-500);
  align-items: center;
}

.legend-swatch {
  width: 14px;
  height: 14px;
  border-radius: 3px;
  display: inline-block;
  vertical-align: middle;
  margin-right: 5px;
  border: 1px solid rgba(0,0,0,0.08);
}

/* Channel letter colors apply in the legend too */
.matrix-legend code.ch-U { color: #1d4ed8; background: none; border: none; font-weight: 700; }
.matrix-legend code.ch-B { color: #065f46; background: none; border: none; font-weight: 700; }
.matrix-legend code.ch-H { color: #92400e; background: none; border: none; font-weight: 700; }
.matrix-legend code.ch-C { color: #9d174d; background: none; border: none; font-weight: 700; }

.swatch-third  { background: rgba(213,94,0,0.22); }
.swatch-first  { background: rgba(0,158,115,0.22); }
.swatch-both   { background: rgba(230,159,0,0.26); }
.swatch-none   { background: var(--white); border-color: var(--slate-200); }

/* ── Sankey ───────────────────────────────────────────────── */
#sankey { background: var(--slate-900); color: var(--white); }
#sankey .section-title { color: var(--white); }
#sankey .section-desc  { color: var(--slate-400); }

.sankey-controls {
  display: flex;
  gap: 8px;
  margin-bottom: 20px;
}

.tab-btn {
  font-family: var(--sans);
  font-size: 0.9rem;
  font-weight: 600;
  padding: 11px 20px;
  border-radius: 8px;
  border: 1.5px solid rgba(255,255,255,0.1);
  background: rgba(255,255,255,0.04);
  color: var(--slate-400);
  cursor: pointer;
  transition: all 0.15s;
}

.tab-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.tab-btn.active {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--slate-900);
}

.sankey-legend {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
  margin-bottom: 20px;
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 7px;
  font-size: 0.875rem;
  color: var(--slate-400);
}

.legend-dot {
  width: 10px;
  height: 10px;
  border-radius: 2px;
  flex-shrink: 0;
}

.legend-dot.adv { background: var(--adv-color); }
.legend-dot.ana { background: var(--ana-color); }
.legend-dot.oth { background: var(--oth-color); }
.legend-dot.bot { background: var(--slate-600); }

#sankey-container {
  border-radius: 12px;
  overflow: hidden;
  background: rgba(255,255,255,0.03);
  border: 1px solid rgba(255,255,255,0.06);
}

#sankey-svg { width: 100%; display: block; }

.sankey-note {
  font-size: 0.875rem;
  color: var(--slate-600);
  margin-top: 10px;
  font-style: italic;
}

.sankey-tooltip {
  position: fixed;
  pointer-events: none;
  background: var(--white);
  color: var(--slate-900);
  padding: 8px 12px;
  border-radius: 8px;
  font-size: 0.78rem;
  line-height: 1.5;
  max-width: 220px;
  z-index: 9999;
  opacity: 0;
  transition: opacity 0.12s;
  box-shadow: 0 4px 16px rgba(0,0,0,0.2);
  border: 1px solid var(--slate-200);
}

/* ── Case Studies ─────────────────────────────────────────── */
.case-study {
  border-radius: 12px;
  border: 1px solid var(--slate-200);
  overflow: hidden;
  margin-bottom: 16px;
  box-shadow: 0 1px 3px rgba(0,0,0,0.04);
  transition: box-shadow 0.15s;
}

.case-study:hover { box-shadow: 0 4px 12px rgba(0,0,0,0.08); }

/* case-study-header is a <button> — reset browser defaults first */
button.case-study-header {
  appearance: none;
  -webkit-appearance: none;
  border: none;
  text-align: left;
  font-family: var(--sans);
  width: 100%;
}

.case-study-header {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 20px 24px;
  background: var(--white);
  cursor: pointer;
  user-select: none;
}

.case-study-header:hover { background: var(--slate-50); }

.severity-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  flex-shrink: 0;
}

.severity-dot.critical { background: var(--danger); box-shadow: 0 0 0 3px rgba(239,68,68,0.18); }
.severity-dot.high     { background: var(--warn);   box-shadow: 0 0 0 3px rgba(249,115,22,0.18); }

.severity-label {
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 3px 9px;
  border-radius: 100px;
  flex-shrink: 0;
}

.severity-label.critical { background: var(--danger-bg); color: var(--danger); }
.severity-label.high     { background: var(--warn-bg);   color: var(--warn); }

.case-study-title-group { flex: 1; }

.case-study-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--slate-900);
  margin-bottom: 3px;
}

.case-study-subtitle {
  font-size: 0.875rem;
  color: var(--slate-500);
  font-family: var(--mono);
}

.case-toggle-icon {
  color: var(--slate-400);
  font-size: 0.9rem;
  flex-shrink: 0;
  transition: transform 0.2s;
}

.case-study.open .case-toggle-icon { transform: rotate(180deg); }

.case-study-body {
  display: none;
  padding: 0 24px 24px;
  border-top: 1px solid var(--slate-100);
}

.case-study.open .case-study-body { display: block; }

.case-description {
  font-size: 1rem;
  line-height: 1.75;
  color: var(--slate-700);
  margin: 18px 0 14px;
}

.case-expanded-detail {
  font-size: 0.9rem;
  color: var(--slate-600);
  line-height: 1.7;
}

.chatbot-tag {
  display: inline-block;
  font-size: 0.82rem;
  font-weight: 600;
  padding: 5px 12px;
  background: var(--slate-100);
  border: 1px solid var(--slate-200);
  border-radius: 6px;
  color: var(--slate-700);
  margin: 2px;
}

.case-payload-toggle {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--slate-500);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 5px;
  margin-top: 14px;
  border: 1px solid var(--slate-200);
  background: var(--slate-50);
  padding: 10px 14px;
  border-radius: 6px;
  font-family: var(--sans);
  transition: all 0.15s;
}

.case-payload-toggle:hover {
  background: var(--slate-100);
  color: var(--slate-800);
}

.payload-block {
  display: none;
  margin-top: 12px;
  background: var(--slate-900);
  border-radius: 10px;
  overflow: hidden;
  border: 1px solid var(--slate-800);
}

.payload-block.open { display: block; }

.payload-label {
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--slate-600);
  padding: 10px 16px;
  border-bottom: 1px solid var(--slate-800);
  font-family: var(--mono);
}

.payload-code {
  display: block;
  font-family: var(--mono);
  font-size: 0.875rem;
  line-height: 1.7;
  color: #e2e8f0;
  padding: 16px 18px;
  overflow-x: auto;
  white-space: pre;
  margin: 0;
}

/* ── Private Mode ─────────────────────────────────────────── */
.before-after {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin-bottom: 40px;
}

.before-col, .after-col {
  border-radius: 12px;
  padding: 32px 36px;
}

.before-col {
  background: var(--slate-900);
  color: var(--white);
}

.after-col {
  background: var(--safe-bg);
  border: 1.5px solid var(--safe);
}

.ba-label {
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: 16px;
}

.before-col .ba-label { color: var(--slate-500); }
.after-col  .ba-label { color: var(--safe); }

.ba-number {
  font-size: 4rem;
  font-weight: 900;
  line-height: 1;
  letter-spacing: -0.04em;
  margin-bottom: 8px;
}

.before-col .ba-number { color: var(--danger); }
.after-col  .ba-number { color: var(--safe); }

.ba-sub {
  font-size: 0.85rem;
  margin-bottom: 16px;
  font-weight: 500;
}

.before-col .ba-sub { color: var(--slate-400); }
.after-col  .ba-sub { color: var(--slate-600); }

.ba-detail {
  font-size: 0.82rem;
  line-height: 1.65;
}

.before-col .ba-detail { color: var(--slate-500); }
.after-col  .ba-detail { color: var(--slate-600); }

.private-mode-note {
  font-size: 0.875rem;
  color: var(--slate-400);
  margin-top: 10px;
}

.private-support-section h3 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--slate-900);
  margin-bottom: 14px;
}

.chatbot-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.chatbot-pill {
  font-size: 0.875rem;
  font-weight: 500;
  padding: 8px 14px;
  border-radius: 100px;
  border: 1.5px solid var(--slate-200);
  display: inline-flex;
  align-items: center;
  gap: 5px;
  color: var(--slate-500);
}

.chatbot-pill.supports {
  border-color: var(--safe);
  color: var(--safe);
  background: var(--safe-bg);
  font-weight: 600;
}

/* ── Privacy Policy ───────────────────────────────────────── */
#privacy-policy { background: var(--slate-50); }

.callout {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  border-radius: 10px;
  padding: 16px 20px;
  margin-bottom: 16px;
  font-size: 0.88rem;
  line-height: 1.6;
}

.callout-icon {
  font-size: 1.1rem;
  flex-shrink: 0;
  margin-top: 1px;
}

.callout.good { background: var(--safe-bg); border: 1px solid rgba(16,185,129,0.3); color: var(--slate-700); }
.callout.bad  { background: var(--danger-bg); border: 1px solid rgba(239,68,68,0.25); color: var(--slate-700); }

.callout strong { color: var(--slate-900); }

.policy-table-wrap {
  overflow-x: auto;
  border-radius: 12px;
  border: 1px solid var(--slate-200);
  background: var(--white);
  box-shadow: 0 1px 4px rgba(0,0,0,0.04);
  margin-top: 24px;
}

#policy-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

#policy-table th {
  text-align: left;
  padding: 12px 18px;
  background: var(--slate-50);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--slate-500);
  border-bottom: 1px solid var(--slate-200);
}

#policy-table td {
  padding: 10px 18px;
  border-bottom: 1px solid var(--slate-100);
  vertical-align: top;
  color: var(--slate-700);
}

#policy-table tr:last-child td { border-bottom: none; }
#policy-table tbody tr:hover td { background: var(--slate-50); }

.policy-check { color: var(--safe);   font-weight: 700; }
.policy-x     { color: var(--danger); font-weight: 700; }
.policy-gap   { color: var(--warn);   font-size: 0.8rem; font-style: italic; }

/* ── Methodology ──────────────────────────────────────────── */
.pipeline {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  background: var(--slate-200);
  border-radius: 12px;
  overflow: hidden;
  margin-bottom: 40px;
  border: 1px solid var(--slate-200);
}

.pipeline-step {
  background: var(--white);
  padding: 24px 20px;
  text-align: center;
  border-right: 1px solid var(--slate-200);
  position: relative;
}

.pipeline-step:last-child { border-right: none; }

.pipeline-step::after {
  content: '›';
  position: absolute;
  right: -10px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--slate-300);
  font-size: 1.4rem;
  z-index: 1;
}

.pipeline-step:last-child::after { display: none; }

.pipeline-num {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--slate-900);
  color: var(--accent);
  font-size: 0.8rem;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 12px;
  font-family: var(--mono);
}

.pipeline-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--slate-900);
  margin-bottom: 6px;
}

.pipeline-desc {
  font-size: 0.875rem;
  color: var(--slate-500);
  line-height: 1.45;
}

.method-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(270px, 1fr));
  gap: 16px;
}

.method-card {
  background: var(--white);
  border: 1px solid var(--slate-200);
  border-radius: 10px;
  padding: 20px 22px;
  box-shadow: 0 1px 3px rgba(0,0,0,0.04);
}

.method-card h4 {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--slate-900);
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.method-card h4::before {
  content: '';
  width: 3px;
  height: 14px;
  background: var(--accent);
  border-radius: 2px;
  flex-shrink: 0;
}

.method-card p {
  font-size: 0.9rem;
  color: var(--slate-600);
  line-height: 1.65;
}

/* ── Citation ─────────────────────────────────────────────── */
#citation { background: var(--slate-50); }

.bibtex-toggle {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-family: var(--sans);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--slate-600);
  cursor: pointer;
  background: var(--white);
  border: 1px solid var(--slate-200);
  padding: 11px 18px;
  border-radius: 8px;
  margin-bottom: 14px;
  transition: all 0.15s;
}

.bibtex-toggle:hover { background: var(--slate-100); color: var(--slate-900); }

.bibtex-block {
  background: var(--slate-900);
  border-radius: 10px;
  overflow: hidden;
  max-width: 740px;
  border: 1px solid var(--slate-800);
}

.bibtex-code {
  display: block;
  font-family: var(--mono);
  font-size: 0.9rem;
  line-height: 1.75;
  color: var(--slate-300);
  padding: 20px 22px;
  overflow-x: auto;
  white-space: pre;
  margin: 0;
}

.arxiv-link {
  margin-top: 20px;
  font-size: 0.875rem;
  color: var(--slate-500);
}

.arxiv-link a {
  color: var(--accent);
  font-weight: 600;
}

/* ── Authors ──────────────────────────────────────────────── */
#authors { background: var(--slate-900); }
#authors .section-title { color: var(--white); }

.author-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.author-card {
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.07);
  border-radius: 12px;
  padding: 22px 22px;
  transition: background 0.15s;
}

.author-card:hover { background: rgba(255,255,255,0.07); }

.author-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 0.95rem;
  color: var(--slate-900);
  margin-bottom: 14px;
  flex-shrink: 0;
}

.author-name {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 4px;
}

.author-affil {
  font-size: 0.875rem;
  color: var(--slate-500);
  margin-bottom: 10px;
}

.author-email {
  font-family: var(--mono);
  font-size: 0.875rem;
  color: var(--accent);
  word-break: break-all;
}

/* ── Footer ───────────────────────────────────────────────── */
footer {
  background: var(--slate-900);
  border-top: 1px solid rgba(255,255,255,0.06);
  padding: 24px 0;
  font-size: 0.875rem;
  color: var(--slate-600);
}

footer .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
}

footer nav { display: flex; gap: 18px; flex-wrap: wrap; }
footer nav a { color: var(--slate-600); }
footer nav a:hover { color: var(--slate-300); text-decoration: none; }

/* ── Responsive ───────────────────────────────────────────── */
@media (max-width: 900px) {
  .abstract-body { grid-template-columns: 1fr; gap: 32px; }
  .abstract-sidebar { position: static; flex-direction: row; flex-wrap: wrap; }
  .finding-card { flex: 1; min-width: 220px; }
  .stats-grid { grid-template-columns: repeat(3, 1fr); }
  .author-grid { grid-template-columns: repeat(2, 1fr); }
  .pipeline { grid-template-columns: 1fr 1fr; }
  .pipeline-step::after { display: none; }
}

@media (max-width: 640px) {
  section { padding: 48px 0; }
  .container { padding: 0 16px; }

  /* Nav — keep text readable, let it scroll horizontally */
  #site-nav .nav-brand { display: none; }
  #site-nav nav a { padding: 0 10px; font-size: 0.85rem; }

  /* Hero */
  #hero h1 { font-size: clamp(1.6rem, 6vw, 2rem); }
  .hero-links { flex-direction: column; gap: 8px; }
  .hero-links .btn { width: 100%; justify-content: center; }
  .hero-meta { margin-bottom: 24px; }

  /* Stats */
  .stats-grid { grid-template-columns: 1fr 1fr; }
  .stat-cell { padding: 16px 12px; }

  /* Before/after */
  .before-after { grid-template-columns: 1fr; }
  .before-col, .after-col { padding: 24px 22px; }

  /* Layout */
  .author-grid { grid-template-columns: 1fr 1fr; }
  .pipeline { grid-template-columns: 1fr; }

  /* Case studies */
  .case-study-header { padding: 16px 18px; gap: 12px; }
  .case-study-body { padding: 0 18px 18px; }

  /* Sankey — allow horizontal scroll on narrow screens */
  #sankey-container { overflow-x: auto; }

  /* Section headers */
  .section-header { margin-bottom: 28px; }
}

@media (max-width: 480px) {
  .stats-grid { grid-template-columns: 1fr 1fr; }
  .author-grid { grid-template-columns: 1fr 1fr; }
  .finding-card { min-width: 100%; }
  .matrix-legend { gap: 10px; font-size: 0.82rem; }
  .sankey-legend { gap: 12px; }
  .pipeline-step { padding: 18px 14px; }
  .method-grid { grid-template-columns: 1fr; }
  .hero-authors { font-size: 0.875rem; }
}

@media (max-width: 400px) {
  .author-grid { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: 1fr; }
  #site-nav nav a { padding: 0 7px; font-size: 0.8rem; }
  .case-study-header { padding: 14px 14px; }
}