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

body {
  font-family: 'Inter', sans-serif;
  font-size: 16px;
  line-height: 1.7;
  color: #1a1a2e;
  background: #ffffff;
}

/* ===== Layout ===== */
.container {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 24px;
}

section {
  padding: 56px 0;
  border-bottom: 1px solid #eeeeee;
}

section:last-of-type { border-bottom: none; }

/* ===== Typography ===== */
h1 {
  font-size: 2rem;
  font-weight: 700;
  line-height: 1.25;
  margin-bottom: 16px;
}

h2 {
  font-size: 1.35rem;
  font-weight: 600;
  margin-bottom: 20px;
  padding-bottom: 8px;
  border-bottom: 2px solid #c8a95b;
  display: inline-block;
}

p { margin-bottom: 14px; }
p:last-child { margin-bottom: 0; }

/* ===== Header ===== */
#header {
  padding: 56px 0 40px;
  border-bottom: 1px solid #eeeeee;
  overflow: hidden;
}

.header-inner {
  display: flex;
  align-items: flex-start;
  gap: 40px;
}

.header-text { flex: 1; }

.hero-image {
  width: 220px;
  flex-shrink: 0;
  border-radius: 8px;
  object-fit: cover;
}

.hero-placeholder {
  width: 220px;
  height: 280px;
  flex-shrink: 0;
  border-radius: 8px;
  background: #f4f0e8;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #999;
  font-size: 0.85rem;
}

.badges {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 20px;
}

.badge {
  font-size: 0.75rem;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: 4px;
  background: #f4f0e8;
  color: #7a6030;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 9px 18px;
  border-radius: 6px;
  font-size: 0.9rem;
  font-weight: 600;
  text-decoration: none;
  transition: opacity 0.15s;
}

.btn:hover { opacity: 0.8; }

.btn-primary {
  background: #1a1a2e;
  color: #ffffff;
}

.btn-secondary {
  background: transparent;
  border: 1.5px solid #c8a95b;
  color: #1a1a2e;
}

/* ===== Method Pipeline ===== */
.pipeline {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0;
  margin-top: 28px;
}

.pipeline-step {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  padding: 16px 20px;
  border: 1.5px solid #e0d5c0;
  border-radius: 8px;
  background: #fafaf7;
  min-width: 130px;
  text-align: center;
}

.pipeline-step .icon {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 32px;
}

.pipeline-step .label {
  font-size: 0.8rem;
  font-weight: 600;
  color: #1a1a2e;
}

.pipeline-step .sublabel {
  font-size: 0.72rem;
  color: #777;
}

.pipeline-arrow {
  font-size: 1.4rem;
  color: #c8a95b;
  padding: 0 4px;
  flex-shrink: 0;
}

/* ===== Results Grid ===== */
.figures-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
  margin-top: 28px;
}

.figure-item img {
  width: 100%;
  border-radius: 6px;
  border: 1px solid #eeeeee;
}

.figure-caption {
  font-size: 0.82rem;
  color: #555;
  margin-top: 6px;
  text-align: center;
}

/* ===== Demo / Chat Bubbles ===== */
.dialogue {
  margin-bottom: 40px;
}

.dialogue:last-child { margin-bottom: 0; }

.dialogue-label {
  font-size: 0.78rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: #999;
  margin-bottom: 12px;
}

.bubble-row {
  display: flex;
  margin-bottom: 10px;
}

.bubble-row.user { justify-content: flex-end; }
.bubble-row.zhongli { justify-content: flex-start; }

.bubble {
  max-width: 72%;
  padding: 12px 16px;
  border-radius: 12px;
  font-size: 0.92rem;
  line-height: 1.6;
}

.bubble-row.user .bubble {
  background: #1a1a2e;
  color: #ffffff;
  border-bottom-right-radius: 3px;
}

.bubble-row.zhongli .bubble {
  background: #faf6ec;
  border: 1.5px solid #c8a95b;
  color: #1a1a2e;
  border-bottom-left-radius: 3px;
}

.bubble-speaker {
  font-size: 0.75rem;
  font-weight: 600;
  margin-bottom: 4px;
  opacity: 0.7;
}

details {
  margin-top: 8px;
}

details summary {
  font-size: 0.78rem;
  color: #999;
  cursor: pointer;
}

details p {
  font-size: 0.82rem;
  color: #777;
  margin-top: 6px;
  padding-left: 12px;
  border-left: 2px solid #e0d5c0;
}

/* ===== Footer ===== */
footer {
  padding: 40px 0;
  text-align: center;
  font-size: 0.85rem;
  color: #888;
}

footer a { color: #c8a95b; text-decoration: none; }
footer a:hover { text-decoration: underline; }

pre.bibtex {
  text-align: left;
  background: #f6f6f6;
  border: 1px solid #e0e0e0;
  border-radius: 6px;
  padding: 16px 20px;
  font-size: 0.8rem;
  line-height: 1.6;
  overflow-x: auto;
  margin: 16px auto 0;
  max-width: 640px;
  font-family: 'Courier New', monospace;
}

/* ===== Responsive ===== */
@media (max-width: 640px) {
  h1 { font-size: 1.45rem; }

  .header-inner {
    flex-direction: column-reverse;
    align-items: center;
  }

  .hero-image, .hero-placeholder {
    width: 160px;
    height: 200px;
  }

  .figures-grid {
    grid-template-columns: 1fr;
  }

  .pipeline {
    flex-direction: column;
    align-items: center;
  }

  .pipeline-arrow {
    transform: rotate(90deg);
  }

  .bubble { max-width: 90%; }
}