/* =========================================================================
   harness-papers.starseas.org — 理论研究站
   ========================================================================= */

.hero {
  padding: 120px 0 64px;
  text-align: center;
  border-bottom: 1px solid var(--border);
}

.hero-badge {
  display: inline-block;
  padding: 6px 14px;
  border: 1px solid var(--border);
  border-radius: 100px;
  font-size: 12px;
  font-weight: 500;
  color: var(--text-muted);
  margin-bottom: 24px;
}

.hero-title {
  font-size: clamp(32px, 5vw, 48px);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.03em;
  color: #fff;
  margin-bottom: 16px;
}

.hero-title .accent { color: #8B5CF6; }

.hero-subtitle {
  font-size: 16px;
  line-height: 1.7;
  color: var(--text-dim);
  max-width: 560px;
  margin: 0 auto;
}

/* --- Audience Paths --- */
.paths-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.path-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px 20px;
  text-align: center;
  transition: border-color 0.2s;
}

.path-card:hover { border-color: var(--border-hover); }

.path-icon {
  color: #8B5CF6;
  margin-bottom: 12px;
  display: flex;
  justify-content: center;
}

.path-card h3 {
  font-size: 15px;
  font-weight: 600;
  color: #fff;
  margin-bottom: 8px;
}

.path-card p {
  font-size: 13px;
  color: var(--text-dim);
  line-height: 1.6;
  margin-bottom: 12px;
}

.path-arrow {
  font-size: 12px;
  color: #8B5CF6;
  font-weight: 500;
}

/* --- Papers Grid --- */
.section-papers {
  background: linear-gradient(180deg, rgba(139, 92, 246, 0.02) 0%, transparent 100%);
}

.papers-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}

.paper-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 20px;
  transition: border-color 0.2s;
}

.paper-card:hover { border-color: var(--border-hover); }

.paper-num {
  font-size: 11px;
  font-weight: 700;
  color: var(--text-muted);
  margin-bottom: 6px;
  display: block;
}

.paper-card h3 {
  font-size: 14px;
  font-weight: 600;
  color: #fff;
  margin-bottom: 6px;
}

.paper-card p {
  font-size: 13px;
  color: var(--text-dim);
  line-height: 1.6;
}

/* --- Architecture --- */
.section-arch {
  border-top: 1px solid var(--border);
}

.arch-diagram {
  display: flex;
  align-items: stretch;
  justify-content: center;
  gap: 24px;
  max-width: 720px;
  margin: 0 auto;
}

.arch-side {
  flex: 1;
  padding: 24px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
}

.arch-left {
  background: rgba(139, 92, 246, 0.04);
  border-color: rgba(139, 92, 246, 0.15);
}

.arch-right {
  background: rgba(59, 130, 246, 0.04);
  border-color: rgba(59, 130, 246, 0.15);
}

.arch-title {
  font-size: 14px;
  font-weight: 600;
  color: #fff;
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border);
}

.arch-side ul {
  list-style: none;
}

.arch-side li {
  font-size: 13px;
  color: var(--text-dim);
  padding: 6px 0;
  display: flex;
  align-items: center;
  gap: 8px;
}

.arch-side li::before {
  content: "→";
  color: var(--text-muted);
  font-size: 11px;
}

.arch-arrow {
  display: flex;
  align-items: center;
  color: var(--text-muted);
  opacity: 0.4;
}

/* --- Responsive --- */
@media (max-width: 768px) {
  .hero { padding: 90px 0 48px; }

  .paths-grid { grid-template-columns: repeat(2, 1fr); }
  .papers-grid { grid-template-columns: 1fr; }

  .arch-diagram {
    flex-direction: column;
    gap: 12px;
  }
  .arch-arrow { transform: rotate(90deg); justify-content: center; }
}

@media (max-width: 480px) {
  .paths-grid { grid-template-columns: 1fr; }
}