/* ============================================================
   CFT Explorer — Main Stylesheet
   Palette: matches LaTeX colour definitions
   ============================================================ */

:root {
  --blue: #1a4a8a;
  --blue-mid: #2e6db4;
  --blue-light: #d6e4f5;
  --teal: #1b6b6b;
  --teal-light: #eaf4f4;
  --amber: #b06000;
  --amber-light: #fdf4e3;
  --green: #1a6a2a;
  --green-light: #eaf4ec;
  --red: #8a2020;
  --red-light: #fdf0f0;
  --purple: #5a1a7a;
  --purple-light: #f5eef8;
  --orange: #a04000;
  --orange-light: #fef3e8;
  --gray: #555555;
  --gray-light: #f4f7fb;
  --rule: #a0b8d8;
  --bg: #f4f7fb;
  --white: #ffffff;
  --text: #1a1a1a;
  --mono: "SFMono-Regular", "Consolas", "Liberation Mono", monospace;
}

/* ── Reset / base ─────────────────────────────────────────── */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
html {
  font-size: 16px;
  scroll-behavior: smooth;
}
body {
  font-family: "Georgia", "Times New Roman", serif;
  color: var(--text);
  background: #fafbfd;
  line-height: 1.65;
}
h1,
h2,
h3,
h4,
h5,
nav,
label,
button,
.tag,
.badge,
.nav-link,
.entry-id {
  font-family: "Helvetica Neue", "Arial", sans-serif;
}
a {
  color: var(--blue);
  text-decoration: none;
}
a:hover {
  text-decoration: underline;
}
img {
  max-width: 100%;
  display: block;
}
code,
pre {
  font-family: var(--mono);
  font-size: 0.85em;
}
pre {
  background: #f0f4f8;
  border: 1px solid var(--rule);
  border-radius: 6px;
  padding: 12px 16px;
  overflow-x: auto;
  line-height: 1.5;
}

/* ── Layout ───────────────────────────────────────────────── */
.site-wrap {
  max-width: 1300px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ── Top navigation bar ───────────────────────────────────── */
.site-nav {
  background: var(--blue);
  color: white;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.25);
}
.site-nav .site-wrap {
  display: flex;
  align-items: center;
  gap: 0;
  height: 52px;
}
.nav-brand {
  font-weight: 700;
  font-size: 1rem;
  letter-spacing: 0.02em;
  color: white;
  margin-right: 32px;
  white-space: nowrap;
}
.nav-brand span {
  opacity: 0.65;
  font-weight: 400;
}
.nav-links {
  display: flex;
  gap: 4px;
  flex: 1;
}
.nav-link {
  color: rgba(255, 255, 255, 0.8);
  padding: 6px 14px;
  border-radius: 5px;
  font-size: 0.875rem;
  font-weight: 500;
  transition:
    background 0.15s,
    color 0.15s;
}
.nav-link:hover,
.nav-link.active {
  background: rgba(255, 255, 255, 0.15);
  color: white;
  text-decoration: none;
}

/* ── Page hero ────────────────────────────────────────────── */
.hero {
  background: linear-gradient(
    135deg,
    var(--blue) 0%,
    #0d3060 60%,
    #1b4a5a 100%
  );
  color: white;
  padding: 64px 24px 56px;
  text-align: center;
}
.hero h1 {
  font-size: 2.5rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 12px;
}
.hero .subtitle {
  font-size: 1.15rem;
  opacity: 0.8;
  max-width: 680px;
  margin: 0 auto 20px;
  font-family: "Georgia", serif;
  font-style: italic;
}
.hero .tagline {
  font-size: 0.875rem;
  opacity: 0.65;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  font-family: sans-serif;
}
.hero-rule {
  width: 60px;
  height: 3px;
  background: rgba(255, 255, 255, 0.4);
  margin: 20px auto 0;
  border-radius: 2px;
}

/* ── Section headers ──────────────────────────────────────── */
.section-header {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin: 40px 0 20px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--rule);
}
.section-header h2 {
  font-size: 1.35rem;
  color: var(--blue);
  font-weight: 700;
}
.section-header .section-sub {
  font-size: 0.875rem;
  color: var(--gray);
  font-style: italic;
  font-family: serif;
}

/* ── Cards / entry grid ───────────────────────────────────── */
.entry-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(310px, 1fr));
  gap: 20px;
  margin-bottom: 40px;
}
.entry-card {
  background: white;
  border: 1px solid #dce8f5;
  border-radius: 10px;
  overflow: hidden;
  box-shadow: 0 2px 6px rgba(26, 74, 138, 0.07);
  transition:
    box-shadow 0.2s,
    transform 0.15s;
  cursor: pointer;
  display: flex;
  flex-direction: column;
}
.entry-card:hover {
  box-shadow: 0 6px 20px rgba(26, 74, 138, 0.16);
  transform: translateY(-2px);
}
.entry-card-header {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px 10px;
  border-bottom: 1px solid #eef2f8;
}
.entry-id {
  font-size: 1.1rem;
  font-weight: 800;
  color: white;
  background: var(--blue);
  width: 42px;
  height: 42px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  letter-spacing: -0.02em;
}
.entry-card-header h3 {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text);
  line-height: 1.3;
}
.entry-card-header .sm-analogue {
  font-size: 0.75rem;
  color: var(--gray);
  font-style: italic;
  font-family: serif;
}
.entry-card-img {
  background: #f0f4f8;
  overflow: hidden;
  flex-shrink: 0;
  height: 180px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.entry-card-img img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  padding: 4px;
}
.entry-card-body {
  padding: 12px 16px 14px;
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.entry-card-desc {
  font-size: 0.875rem;
  color: #333;
  line-height: 1.55;
}
.entry-card-footer {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: auto;
  padding-top: 8px;
}
.tag {
  font-size: 0.72rem;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 20px;
  background: var(--blue-light);
  color: var(--blue);
  letter-spacing: 0.03em;
}
.tag.topo {
  background: #e0f0e8;
  color: var(--green);
}
.tag.soliton {
  background: #fff0d8;
  color: var(--amber);
}
.tag.limit {
  background: var(--purple-light);
  color: var(--purple);
}
.tag.stable {
  background: #e0f4e8;
  color: var(--green);
}
.tag.meta {
  background: var(--amber-light);
  color: var(--amber);
}

/* Class colour chips on card ID */
.cls-0 {
  background: var(--gray);
}
.cls-I {
  background: var(--blue);
}
.cls-II {
  background: var(--teal);
}
.cls-D {
  background: var(--amber);
}
.cls-E {
  background: var(--green);
}
.cls-F {
  background: var(--purple);
}

/* ── Detail modal / overlay ───────────────────────────────── */
.modal-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(10, 20, 40, 0.6);
  z-index: 500;
  overflow-y: auto;
  padding: 40px 16px;
}
.modal-overlay.open {
  display: flex;
  align-items: flex-start;
  justify-content: center;
}
.modal {
  background: white;
  border-radius: 12px;
  width: 100%;
  max-width: 900px;
  overflow: hidden;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.35);
  animation: modalIn 0.22s ease;
}
@keyframes modalIn {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}
.modal-header {
  background: var(--blue);
  color: white;
  padding: 20px 24px 16px;
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
}
.modal-header-info h2 {
  font-size: 1.3rem;
  font-weight: 800;
}
.modal-header-info .mh-sub {
  font-size: 0.875rem;
  opacity: 0.75;
  font-family: serif;
  font-style: italic;
  margin-top: 3px;
}
.modal-close {
  background: rgba(255, 255, 255, 0.15);
  border: none;
  color: white;
  width: 32px;
  height: 32px;
  border-radius: 6px;
  font-size: 1.1rem;
  cursor: pointer;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.15s;
}
.modal-close:hover {
  background: rgba(255, 255, 255, 0.3);
}
.modal-body {
  padding: 24px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}
@media (max-width: 640px) {
  .modal-body {
    grid-template-columns: 1fr;
  }
}
.modal-figure img {
  width: 100%;
  border-radius: 6px;
  border: 1px solid #dce8f5;
}
.modal-figure figcaption {
  font-size: 0.78rem;
  color: var(--gray);
  margin-top: 6px;
  font-style: italic;
  text-align: center;
}
.modal-info {
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.modal-abstract {
  font-size: 0.9rem;
  line-height: 1.65;
  color: #2a2a2a;
  border-left: 3px solid var(--rule);
  padding-left: 12px;
}
.modal-params {
  font-size: 0.85rem;
}
.modal-params table {
  width: 100%;
  border-collapse: collapse;
}
.modal-params td {
  padding: 4px 8px 4px 0;
  border-bottom: 1px solid #eef2f8;
  vertical-align: top;
}
.modal-params td:first-child {
  color: var(--gray);
  font-family: var(--mono);
  white-space: nowrap;
  width: 36%;
}
.modal-conv {
  margin-top: 4px;
}
.modal-conv h4 {
  font-size: 0.8rem;
  color: var(--gray);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 8px;
}
.modal-conv-imgs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}
.modal-conv-imgs img {
  border-radius: 4px;
  border: 1px solid #dce8f5;
}
.modal-cli pre {
  font-size: 0.78rem;
  margin: 0;
}
.modal-stability {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.82rem;
  font-weight: 700;
  font-family: sans-serif;
  padding: 4px 10px;
  border-radius: 20px;
}
.modal-stability.stable {
  background: #e0f4e8;
  color: var(--green);
}
.modal-stability.meta {
  background: var(--amber-light);
  color: var(--amber);
}

/* ── Class filter bar ─────────────────────────────────────── */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 24px 0 20px;
  align-items: center;
}
.filter-bar span {
  font-size: 0.82rem;
  color: var(--gray);
  margin-right: 4px;
  font-family: sans-serif;
}
.filter-btn {
  font-family: sans-serif;
  font-size: 0.8rem;
  font-weight: 600;
  padding: 5px 14px;
  border-radius: 20px;
  border: 1.5px solid transparent;
  cursor: pointer;
  transition: all 0.15s;
  background: white;
  border-color: var(--rule);
  color: var(--gray);
}
.filter-btn:hover {
  border-color: var(--blue);
  color: var(--blue);
}
.filter-btn.active {
  background: var(--blue);
  color: white;
  border-color: var(--blue);
}

/* ── Interaction scenarios ────────────────────────────────── */
.scenario-list {
  display: flex;
  flex-direction: column;
  gap: 40px;
  margin-bottom: 48px;
}
.scenario {
  background: white;
  border: 1px solid #dce8f5;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 2px 8px rgba(26, 74, 138, 0.07);
}
.scenario-header {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 18px 24px 14px;
  border-bottom: 1px solid #eef2f8;
}
.scenario-id {
  font-size: 1.3rem;
  font-weight: 900;
  color: white;
  width: 52px;
  height: 52px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.scenario-header-text h3 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text);
}
.scenario-header-text .sc-sub {
  font-size: 0.875rem;
  color: var(--gray);
  font-style: italic;
  font-family: serif;
}
.scenario-body {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  padding: 24px;
}
@media (max-width: 700px) {
  .scenario-body {
    grid-template-columns: 1fr;
  }
}
.scenario-anim img {
  width: 100%;
  border-radius: 8px;
  border: 1px solid #dce8f5;
  background: #f0f4f8;
}
.scenario-anim figcaption {
  font-size: 0.78rem;
  color: var(--gray);
  text-align: center;
  margin-top: 6px;
  font-style: italic;
}
.scenario-static {
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.scenario-static img {
  width: 100%;
  border-radius: 8px;
  border: 1px solid #dce8f5;
}
.scenario-desc {
  font-size: 0.9rem;
  line-height: 1.65;
  color: #2a2a2a;
}
.scenario-gestalt {
  margin-top: 10px;
  padding: 12px 16px;
  border-left: 4px solid var(--purple);
  background: var(--purple-light);
  border-radius: 0 6px 6px 0;
  font-size: 0.875rem;
  color: #2a2a2a;
}
.scenario-gestalt strong {
  color: var(--purple);
  font-family: sans-serif;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  display: block;
  margin-bottom: 4px;
}
.scenario-params {
  font-size: 0.82rem;
  border-collapse: collapse;
  width: 100%;
}
.scenario-params td {
  padding: 3px 8px 3px 0;
  border-bottom: 1px solid #eef2f8;
}
.scenario-params td:first-child {
  color: var(--gray);
  font-family: var(--mono);
  width: 40%;
}
.scenario-params-wrap h4 {
  font-size: 0.78rem;
  color: var(--gray);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 8px;
  font-family: sans-serif;
}
.scenario-cli {
  background: #f0f4f8;
  border: 1px solid var(--rule);
  border-radius: 6px;
  padding: 10px 14px;
  font-family: var(--mono);
  font-size: 0.8rem;
  overflow-x: auto;
  white-space: pre;
}

/* Scenario accent colours */
.ix1 .scenario-id,
.ix1-bg {
  background: var(--red);
}
.ix2 .scenario-id,
.ix2-bg {
  background: var(--blue);
}
.ix3 .scenario-id,
.ix3-bg {
  background: var(--teal);
}
.ix4 .scenario-id,
.ix4-bg {
  background: var(--purple);
}
.ix5 .scenario-id,
.ix5-bg {
  background: var(--orange);
}

/* ── Summary overview cards ───────────────────────────────── */
.overview-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 16px;
  margin-bottom: 40px;
}
.overview-card {
  background: white;
  border: 1px solid #dce8f5;
  border-radius: 10px;
  padding: 20px;
  text-align: center;
  box-shadow: 0 1px 4px rgba(26, 74, 138, 0.06);
}
.overview-card .ov-num {
  font-size: 2.4rem;
  font-weight: 900;
  color: var(--blue);
  line-height: 1;
  font-family: sans-serif;
}
.overview-card .ov-label {
  font-size: 0.82rem;
  color: var(--gray);
  margin-top: 4px;
  font-family: sans-serif;
}

/* ── Class section separators ─────────────────────────────── */
.class-section {
  margin-bottom: 32px;
}
.class-label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: sans-serif;
  font-size: 0.875rem;
  font-weight: 700;
  padding: 4px 14px 4px 10px;
  border-radius: 20px;
  color: white;
  margin-bottom: 16px;
}

/* ── Math inline (KaTeX-style fallback) ───────────────────── */
.math {
  font-style: italic;
  font-family: "Times New Roman", serif;
}

/* ── Page footer ──────────────────────────────────────────── */
.site-footer {
  margin-top: 64px;
  border-top: 1px solid #dce8f5;
  padding: 24px;
  text-align: center;
  font-size: 0.82rem;
  color: var(--gray);
  font-family: sans-serif;
}

/* ── Responsive ───────────────────────────────────────────── */
@media (max-width: 600px) {
  .hero h1 {
    font-size: 1.8rem;
  }
  .entry-grid {
    grid-template-columns: 1fr;
  }
  .nav-links {
    gap: 2px;
  }
  .nav-link {
    padding: 5px 8px;
    font-size: 0.8rem;
  }
}