/* ===================================================
   song-dynasty.css — Song Dynasty Golden Age Styles
   Inherits design tokens from styles.css
   =================================================== */

/* ===== Hero ===== */
.song-hero {
  background: linear-gradient(135deg, #1a1008 0%, #2a1a0a 30%, #1a2a1a 60%, #0a1a2a 100%);
}

.song-hero::before {
  background:
    radial-gradient(circle at 20% 50%, rgba(212,168,67,0.2) 0%, transparent 45%),
    radial-gradient(circle at 80% 30%, rgba(80,140,80,0.1) 0%, transparent 40%),
    radial-gradient(circle at 50% 80%, rgba(100,60,40,0.1) 0%, transparent 35%);
}

.song-hero .subtitle { color: #c0a060; }

/* ===== Section Spacing ===== */
.song-section { padding: 4rem 0; }
.song-section + .song-section { border-top: 1px solid var(--color-border); }

/* ===== Context Grid ===== */
.context-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
  margin-bottom: 3rem;
}

.context-card {
  background: var(--color-surface);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: all var(--transition);
}

.context-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}

.context-header {
  padding: 1.2rem 1.5rem;
  display: flex;
  align-items: center;
  gap: 0.8rem;
}

.ctx-politics { background: linear-gradient(135deg, #4a3a2a, #5a4a3a); }
.ctx-economy { background: linear-gradient(135deg, #3a4a2a, #4a5a3a); }
.ctx-knowledge { background: linear-gradient(135deg, #2a3a4a, #3a4a5a); }
.ctx-compare { background: linear-gradient(135deg, #4a2a3a, #5a3a4a); }

.ctx-icon { font-size: 1.6rem; }
.context-header h3 { color: #fff; font-size: 1.05rem; }

.ctx-body { padding: 1.5rem; }
.ctx-body p { font-size: 0.95rem; color: var(--color-text-secondary); line-height: 1.8; }
.ctx-body ul {
  list-style: none;
  padding: 0;
}
.ctx-body li {
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--color-border);
  font-size: 0.93rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
}
.ctx-body li:last-child { border-bottom: none; }

/* ===== Song Stats ===== */
.song-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1.5rem;
  max-width: 900px;
  margin: 0 auto;
}

.stat-item {
  text-align: center;
  padding: 1.5rem;
  background: var(--color-surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  border-bottom: 4px solid var(--color-gold);
}

.stat-number {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 2rem;
  color: var(--color-accent);
  margin-bottom: 0.3rem;
}

.stat-label {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  line-height: 1.4;
}

/* ===== Inventions Song Section ===== */
.inventions-song-section {
  background: var(--color-surface);
}

/* ===== Song Invention Blocks ===== */
.song-invention {
  max-width: 900px;
  margin: 0 auto 3.5rem;
  padding-bottom: 3.5rem;
  border-bottom: 1px solid var(--color-border);
}

.song-invention:last-of-type {
  border-bottom: none;
  margin-bottom: 0;
  padding-bottom: 0;
}

.invention-header {
  display: flex;
  align-items: flex-start;
  gap: 1.2rem;
  margin-bottom: 1.5rem;
}

.inv-emoji { font-size: 3rem; flex-shrink: 0; line-height: 1; }
.invention-header h3 { font-size: 1.4rem; margin-bottom: 0.3rem; }
.inv-date { color: var(--color-gold); font-size: 0.95rem; margin: 0; }

.invention-body p {
  font-size: 1.05rem;
  line-height: 1.9;
  color: var(--color-text-secondary);
}

/* Paradox Box */
.paradox-box {
  background: linear-gradient(135deg, #faf6ee, #f5f0e4);
  border-radius: var(--radius);
  padding: 1.5rem 2rem;
  margin: 1.5rem 0;
  border-left: 4px solid var(--color-gold);
}

.paradox-box h4 {
  color: var(--color-accent);
  margin-bottom: 0.8rem;
  font-size: 1.05rem;
}

.paradox-box p {
  font-size: 0.95rem !important;
  color: var(--color-text-secondary);
}

/* Evolution Steps */
.evolution-steps {
  margin: 1.5rem 0;
}

.evo-step {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  padding: 1rem 0;
  border-bottom: 1px solid var(--color-border);
}

.evo-step:last-child { border-bottom: none; }

.evo-icon { font-size: 2rem; flex-shrink: 0; }
.evo-step h4 { font-size: 1rem; margin-bottom: 0.3rem; }
.evo-step p { font-size: 0.9rem; color: var(--color-text-secondary); margin: 0; }

/* Weapons Grid */
.weapons-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.2rem;
  margin: 1.5rem 0;
}

.weapon-card {
  background: var(--color-bg);
  border-radius: var(--radius);
  padding: 1.2rem;
  text-align: center;
  transition: all var(--transition);
}

.weapon-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-hover);
}

.weapon-icon { font-size: 2rem; margin-bottom: 0.5rem; }
.weapon-card h4 { font-size: 0.95rem; margin-bottom: 0.4rem; }
.weapon-card p { font-size: 0.85rem; color: var(--color-text-secondary); margin: 0; line-height: 1.6; }

/* Highlight Box */
.highlight-box {
  background: linear-gradient(135deg, #faf6ee, #f5f0e4);
  border-radius: var(--radius);
  padding: 2rem 2.5rem;
  margin: 2rem 0;
  border-left: 4px solid var(--color-accent);
}

.highlight-box h4 {
  color: var(--color-accent);
  margin-bottom: 1rem;
  font-size: 1.15rem;
}

.highlight-box p {
  font-size: 1rem;
  color: var(--color-text-secondary);
  line-height: 1.8;
}

/* Why Three */
.why-three {
  max-width: 900px;
  margin: 3rem auto 0;
}

.why-three h3 {
  text-align: center;
  margin-bottom: 2rem;
  font-size: 1.3rem;
}

.why-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.5rem;
}

.why-item {
  background: var(--color-bg);
  border-radius: var(--radius);
  padding: 1.5rem;
  text-align: center;
  box-shadow: var(--shadow);
}

.why-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: var(--color-accent);
  color: #fff;
  font-weight: 700;
  border-radius: 50%;
  margin-bottom: 0.8rem;
}

.why-item h4 { font-size: 1rem; margin-bottom: 0.5rem; }
.why-item p { font-size: 0.9rem; color: var(--color-text-secondary); margin: 0; line-height: 1.7; }

/* ===== Tech Revolution Grid ===== */
.tech-revolution-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: 2rem;
  max-width: 960px;
  margin: 0 auto;
}

.tech-card {
  background: var(--color-surface);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: all var(--transition);
}

.tech-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}

.tech-header {
  padding: 1.2rem 1.5rem;
  display: flex;
  align-items: center;
  gap: 0.8rem;
}

.tech-astro { background: linear-gradient(135deg, #1a2a40, #2a3a50); }
.tech-math { background: linear-gradient(135deg, #3a2a50, #4a3a60); }
.tech-med { background: linear-gradient(135deg, #2a4a3a, #3a5a4a); }
.tech-eng { background: linear-gradient(135deg, #4a3a20, #5a4a30); }
.tech-agri { background: linear-gradient(135deg, #3a4a2a, #4a5a3a); }
.tech-finance { background: linear-gradient(135deg, #4a3a2a, #5a4a3a); }

.tech-icon { font-size: 1.6rem; }
.tech-header h3 { color: #fff; font-size: 1.05rem; }

.tech-body { padding: 1.5rem; }
.tech-body h4 { font-size: 1rem; margin-bottom: 0.5rem; color: var(--color-ink); }
.tech-body p { font-size: 0.93rem; color: var(--color-text-secondary); line-height: 1.8; }
.tech-body ul { margin: 0.8em 0 1em 1.2em; line-height: 1.7; }
.tech-body li { margin-bottom: 0.4em; font-size: 0.93rem; color: var(--color-text-secondary); }

.finance-warning {
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px dashed var(--color-border);
  font-style: italic;
}

/* ===== Shen Kuo Section ===== */
.shen-kuo-section {
  background: var(--color-surface);
  padding: 4rem 0;
}

.shen-profile {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 2rem;
  max-width: 900px;
  margin: 0 auto 3rem;
  align-items: start;
}

.shen-portrait {
  text-align: center;
}

.portrait-frame {
  background: linear-gradient(135deg, #f5efe0, #e8e0d0);
  border-radius: var(--radius);
  padding: 2rem 1.5rem;
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.3rem;
}

.portrait-emoji { font-size: 4rem; }
.portrait-label {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-ink);
}
.portrait-years {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
}

.shen-intro p {
  font-size: 1.05rem;
  line-height: 1.9;
  color: var(--color-text-secondary);
}

/* Shen Kuo Discoveries */
.shen-discoveries {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.5rem;
  max-width: 900px;
  margin: 0 auto 3rem;
}

.discovery-card {
  background: var(--color-bg);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--shadow);
  transition: all var(--transition);
  border-top: 3px solid var(--color-gold);
}

.discovery-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-hover);
}

.disc-icon { font-size: 2rem; margin-bottom: 0.5rem; }
.discovery-card h4 { font-size: 1rem; margin-bottom: 0.5rem; }
.discovery-card p { font-size: 0.9rem; color: var(--color-text-secondary); margin: 0; line-height: 1.7; }

/* Shen Kuo Paradox */
.shen-paradox {
  max-width: 900px;
  margin: 0 auto;
}

.shen-paradox h3 {
  text-align: center;
  margin-bottom: 1rem;
  font-size: 1.3rem;
}

.shen-paradox > p {
  text-align: center;
  font-size: 1rem;
  color: var(--color-text-secondary);
  margin-bottom: 2rem;
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
}

.paradox-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.5rem;
}

.paradox-item {
  background: var(--color-bg);
  border-radius: var(--radius);
  padding: 1.5rem;
  border-left: 4px solid var(--color-accent);
}

.paradox-item h4 { font-size: 1rem; margin-bottom: 0.5rem; color: var(--color-accent); }
.paradox-item p { font-size: 0.9rem; color: var(--color-text-secondary); margin: 0; line-height: 1.7; }

/* ===== Tragedy Grid ===== */
.tragedy-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: 2rem;
  max-width: 960px;
  margin: 0 auto 3rem;
}

.tragedy-card {
  background: var(--color-surface);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
}

.tragedy-header {
  padding: 1.2rem 1.5rem;
  display: flex;
  align-items: center;
  gap: 0.8rem;
}

.tragedy-external { background: linear-gradient(135deg, #5a2a2a, #6a3a3a); }
.tragedy-internal { background: linear-gradient(135deg, #4a4a2a, #5a5a3a); }

.tragedy-icon { font-size: 1.6rem; }
.tragedy-header h3 { color: #fff; font-size: 1.1rem; }

.tragedy-body { padding: 1.5rem; }

.tragedy-event {
  margin-bottom: 1.5rem;
}

.tragedy-event:last-child { margin-bottom: 0; }

.tragedy-event h4 { font-size: 1rem; margin-bottom: 0.5rem; color: var(--color-ink); }
.tragedy-event p { font-size: 0.93rem; color: var(--color-text-secondary); line-height: 1.8; margin: 0; }

/* ===== Song vs Europe Compare Table ===== */
.song-europe-compare {
  max-width: 900px;
  margin: 0 auto;
}

.song-europe-compare h3 {
  text-align: center;
  margin-bottom: 1.5rem;
  font-size: 1.3rem;
}

.compare-table-wrapper {
  overflow-x: auto;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.compare-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--color-bg);
  font-size: 0.93rem;
}

.compare-table thead {
  background: var(--color-ink);
  color: #fff;
}

.compare-table th {
  padding: 1rem 1.2rem;
  text-align: left;
  font-weight: 600;
  font-size: 0.9rem;
}

.compare-table td {
  padding: 0.9rem 1.2rem;
  border-bottom: 1px solid var(--color-border);
  vertical-align: top;
}

.compare-table tbody tr:hover {
  background: var(--color-gold-light);
}

.compare-table tbody tr:last-child td {
  border-bottom: none;
}

/* ===== Legacy Section ===== */
.legacy-section {
  background: var(--color-bg);
}

.legacy-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 2rem;
  max-width: 960px;
  margin: 0 auto 2.5rem;
}

.legacy-card {
  background: var(--color-surface);
  border-radius: var(--radius);
  padding: 2rem;
  text-align: center;
  box-shadow: var(--shadow);
  transition: all var(--transition);
  border-bottom: 4px solid var(--color-gold);
}

.legacy-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}

.legacy-icon { font-size: 2.5rem; margin-bottom: 1rem; }
.legacy-card h3 { font-size: 1.1rem; margin-bottom: 0.8rem; }
.legacy-card p { font-size: 0.93rem; color: var(--color-text-secondary); line-height: 1.8; margin: 0; }

/* ===== Song Quote ===== */
.song-quote {
  border-left: 4px solid var(--color-gold);
  padding: 1.5rem 2rem;
  margin: 0 auto;
  background: linear-gradient(135deg, #faf6ee, #f5f0e4);
  border-radius: 0 var(--radius) var(--radius) 0;
  max-width: 800px;
}

.song-quote p {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  font-style: italic;
  color: var(--color-ink);
  margin: 0;
  line-height: 1.7;
}

/* ===== Responsive ===== */
@media (max-width: 900px) {
  .shen-profile {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
  .shen-portrait { max-width: 200px; margin: 0 auto; }
  .tragedy-grid { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
  .context-grid { grid-template-columns: 1fr; }
  .tech-revolution-grid { grid-template-columns: 1fr; }
  .song-stats { grid-template-columns: 1fr 1fr; }
  .weapons-grid { grid-template-columns: 1fr 1fr; }
  .shen-discoveries { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
  .song-stats { grid-template-columns: 1fr; }
  .weapons-grid { grid-template-columns: 1fr; }
  .paradox-grid { grid-template-columns: 1fr; }
  .legacy-grid { grid-template-columns: 1fr; }
  .why-grid { grid-template-columns: 1fr; }
}

/* ===== Dark Mode ===== */
@media (prefers-color-scheme: dark) {
  .song-hero {
    background: linear-gradient(135deg, #0a0804 0%, #1a1008 30%, #0a1a0a 60%, #040a14 100%);
  }
  .portrait-frame { background: linear-gradient(135deg, #2a2520, #201c18); }
  .paradox-box,
  .highlight-box,
  .song-quote { background: var(--color-surface); }
  .weapon-card,
  .discovery-card,
  .why-item,
  .paradox-item,
  .stat-item { background: var(--color-surface); }
}

/* ===== Print ===== */
@media print {
  .quick-nav { display: none; }
  .song-invention { break-inside: avoid; }
}