/* ==========================================================
   李飞飞致敬站 · 主样式(从 v1.0 静态站改造)
   Stanford 红 #8C1515 主调 · 衬线学术风 · 纯白底
   ========================================================== */

/* === Reset & Base === */
* { margin: 0; padding: 0; box-sizing: border-box; }
body {
  font-family: Georgia, "Noto Serif SC", "Songti SC", serif;
  color: #1a1a1a;
  background: #fff;
  line-height: 1.7;
}
img { max-width: 100%; height: auto; display: block; }
a { color: #8c1515; text-decoration: none; transition: color 0.15s; }
a:hover { color: #5a0e0e; }

/* === Header / Nav === */
.site-header { border-bottom: 1px solid #e8e8e8; background: #fff; position: sticky; top: 0; z-index: 100; }
.header-inner {
  display: flex; justify-content: space-between; align-items: center;
  padding: 1.15rem 5%; flex-wrap: wrap; gap: 1rem;
}
.logo {
  font-family: Arial, sans-serif;
  font-size: 1.05rem; letter-spacing: 0.12em;
  font-weight: bold; color: #1a1a1a;
}
.logo a { color: #1a1a1a; }
.logo span {
  font-family: Georgia, serif; font-size: 0.8rem;
  letter-spacing: 0; color: #8c1515;
  margin-left: 0.7rem; font-weight: normal;
}
.site-header nav ul {
  display: flex; gap: 1.4rem;
  list-style: none; flex-wrap: wrap; margin: 0; padding: 0;
}
.site-header nav a {
  color: #444;
  font-family: Arial, sans-serif;
  font-size: 0.78rem; letter-spacing: 0.04em;
  padding-bottom: 2px;
  border-bottom: 1px solid transparent;
}
.site-header nav a:hover,
.site-header nav .current-menu-item a,
.site-header nav .current_page_item a {
  color: #8c1515;
  border-bottom-color: #8c1515;
}

/* === Main Container === */
.site-main { max-width: 1280px; margin: 0 auto; padding: 0; }

/* === Page Header(子页用)=== */
.page-header {
  padding: 3rem 5% 2rem;
  border-bottom: 1px solid #e8e8e8;
  background: #fafaf7;
}
.page-header h1 {
  font-size: 2.6rem; color: #1a1a1a;
  font-weight: normal; margin-bottom: 0.6rem;
}
.page-header p {
  color: #666; font-family: Arial, sans-serif;
  font-size: 0.95rem; letter-spacing: 0.04em;
}

/* === Content Area === */
.content-area { padding: 3rem 5%; }
.content-area h2 {
  font-size: 1.8rem; color: #1a1a1a;
  margin: 2rem 0 1rem; font-weight: normal;
}
.content-area h3 {
  font-size: 1.25rem; color: #1a1a1a;
  margin: 1.4rem 0 0.6rem;
}
.content-area p { margin-bottom: 1rem; max-width: 800px; }
.content-area ul, .content-area ol { margin: 1rem 0 1.2rem 1.6rem; }
.content-area li { margin-bottom: 0.4rem; }

/* === 首页 Hero(portrait-hero)=== */
.portrait-hero {
  min-height: 480px;
  display: grid; grid-template-columns: 1fr;
  background: #fff; color: #1a1a1a;
  overflow: hidden; border-bottom: 1px solid #e8e8e8;
}
.hero-copy { padding: 6rem 10% 3rem; max-width: 900px; }
.eyebrow {
  font: 600 0.72rem Arial, sans-serif;
  letter-spacing: 0.17em; color: #8c1515;
  margin-bottom: 1.4rem;
}
.hero-copy h1 {
  font-size: 4.6rem; line-height: 1;
  margin-bottom: 0.2rem; font-weight: normal;
  color: #1a1a1a;
}
.hero-name {
  font: 1.5rem Arial, sans-serif;
  letter-spacing: 0.16em; color: #8c1515;
}
.hero-role {
  font-size: 1.2rem; margin: 2rem 0 1.3rem;
  color: #2a2a2a;
}
.hero-intro { max-width: 620px; font-size: 1.1rem; color: #333; }
.cta { display: flex; gap: 1rem; margin-top: 2.2rem; flex-wrap: wrap; }
.btn {
  display: inline-block;
  background: #8c1515; color: #fff;
  padding: 0.7rem 1.4rem;
  font-family: Arial, sans-serif;
  font-size: 0.85rem; letter-spacing: 0.04em;
  border-bottom: none;
}
.btn:hover { background: #5a0e0e; color: #fff; }
.btn-light {
  background: transparent; color: #8c1515;
  border: 1px solid #8c1515;
}
.btn-light:hover { background: #8c1515; color: #fff; }

.hero-art-placeholder {
  height: 90px;
  background: linear-gradient(180deg, #fff, #f5f5f0);
  border-top: 1px dashed #e0e0e0;
  display: flex; align-items: center; justify-content: center;
  color: #8c1515;
  font: 0.7rem Arial, sans-serif; letter-spacing: 0.18em;
}

/* === Fact Strip(首页 3 列数字带)=== */
.fact-strip {
  display: grid; grid-template-columns: repeat(3, 1fr);
  background: #f5f5f0;
  border-top: 1px solid #e8e8e8;
}
.fact-strip > div {
  padding: 2.2rem 5%;
  border-right: 1px solid #e8e8e8;
  text-align: center;
}
.fact-strip > div:last-child { border-right: none; }
.fact-strip b {
  display: block;
  font: 1.6rem Georgia, serif;
  color: #8c1515; margin-bottom: 0.4rem;
}
.fact-strip span {
  font-family: Arial, sans-serif;
  font-size: 0.85rem; color: #666;
  letter-spacing: 0.04em;
}

/* === Story Intro === */
.story-intro {
  padding: 4rem 5%; max-width: 900px;
  margin: 0 auto; text-align: left;
}
.story-intro h2 {
  font-size: 2rem; margin: 0.4rem 0 1rem;
  font-weight: normal; color: #1a1a1a;
}
.story-intro p {
  font-size: 1.1rem; color: #333;
  margin-bottom: 1.4rem;
}
.text-link {
  font-family: Arial, sans-serif;
  font-size: 0.9rem; letter-spacing: 0.04em;
  color: #8c1515; border-bottom: 1px solid #8c1515;
  padding-bottom: 1px;
}
.text-link:hover { color: #5a0e0e; }

/* === Feature Grid(首页 3 张卡片)=== */
.feature-grid {
  display: grid; grid-template-columns: repeat(3, 1fr);
  gap: 0; padding: 0; border-top: 1px solid #e8e8e8;
}
.feature-card {
  padding: 2.4rem 5%;
  border-right: 1px solid #e8e8e8;
  display: block;
  border-bottom: 2px solid #8c1515;  /* L1 偏好:装饰条常驻 */
  transition: background 0.15s;
}
.feature-card:last-child { border-right: none; }
.feature-card:hover { background: #fafaf7; }
.feature-card span {
  font: 600 0.7rem Arial, sans-serif;
  letter-spacing: 0.18em; color: #8c1515;
  display: block; margin-bottom: 0.8rem;
}
.feature-card h3 {
  font-size: 1.4rem; color: #1a1a1a;
  margin: 0 0 0.6rem; font-weight: normal;
}
.feature-card p { color: #444; font-size: 0.95rem; }

/* === World Labs 公共组件(从 v1.0 提取)=== */
.wl-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.4rem; margin: 1.6rem 0; }
.wl-card {
  background: #fff; border: 1px solid #e8e8e8;
  border-left: 3px solid #8c1515;
  padding: 1.2rem 1.4rem;
}
.wl-card h3 { margin: 0 0 0.4rem; font-size: 1.15rem; color: #1a1a1a; }
.wl-card .role {
  font: 0.8rem Arial, sans-serif;
  letter-spacing: 0.08em; color: #8c1515;
  display: block; margin-bottom: 0.5rem;
}
.wl-card p { font-size: 0.95rem; color: #333; margin: 0; }
.wl-figure {
  margin: 1.4rem 0;
  border: 1px solid #e8e8e8;
  background: #fafaf7; padding: 1rem;
  text-align: center;
}
.wl-figure svg { max-width: 100%; height: auto; }
.wl-figure figcaption {
  margin-top: 0.6rem;
  font: 0.82rem Arial, sans-serif;
  color: #666; letter-spacing: 0.04em;
}
.wl-table {
  width: 100%; border-collapse: collapse;
  margin: 1rem 0; font-size: 0.95rem;
}
.wl-table th, .wl-table td {
  padding: 0.6rem 0.8rem;
  border-bottom: 1px solid #e8e8e8;
  text-align: left;
}
.wl-table th {
  background: #f5f5f0; color: #8c1515;
  font: 600 0.8rem Arial, sans-serif; letter-spacing: 0.08em;
}
.wl-table tr:last-child td { border-bottom: 0; }
.wl-pillars {
  display: grid; grid-template-columns: repeat(3, 1fr);
  gap: 1.2rem; margin: 1.6rem 0;
}
.wl-pillar { padding: 1.4rem; background: #f5f5f0; text-align: center; }
.wl-pillar .num { font: 600 1.6rem Georgia, serif; color: #8c1515; }
.wl-pillar .lab {
  font: 0.75rem Arial, sans-serif;
  letter-spacing: 0.12em; color: #666;
  display: block; margin: 0.3rem 0 0.6rem;
}
.wl-pillar p { font-size: 0.9rem; color: #333; margin: 0; }
.wl-callout {
  background: #f5f5f0;
  border-left: 4px solid #8c1515;
  padding: 1.2rem 1.6rem; margin: 1.6rem 0;
}
.wl-callout h4 {
  margin: 0 0 0.4rem; font-size: 1rem;
  color: #8c1515; font-family: Arial, sans-serif;
  letter-spacing: 0.06em;
}
.wl-callout p { margin: 0; color: #222; }

/* === Timeline(通用时间线,即便没有 timeline 页,新闻页可能用)=== */
.timeline {
  position: relative; padding-left: 2rem;
  border-left: 2px solid #8c1515;
  margin: 2rem 0;
}
.timeline-item {
  margin-bottom: 1.6rem; position: relative;
}
.timeline-item::before {
  content: ''; position: absolute;
  left: -2.4rem; top: 0.5rem;
  width: 12px; height: 12px;
  background: #8c1515; border-radius: 50%;
}
.timeline-item h4 {
  font: 600 0.85rem Arial, sans-serif;
  letter-spacing: 0.06em; color: #8c1515;
  margin-bottom: 0.3rem;
}
.timeline-item p { color: #333; margin: 0; font-size: 0.95rem; }

/* === Stats Block === */
.stats-row {
  display: grid; grid-template-columns: repeat(3, 1fr);
  gap: 2rem; margin: 2rem 0;
  text-align: center;
}
.stat .stat-num {
  font: 1.8rem Georgia, serif;
  color: #8c1515; margin-bottom: 0.3rem;
}
.stat .stat-label {
  font-family: Arial, sans-serif;
  font-size: 0.85rem; color: #666;
  letter-spacing: 0.04em;
}

/* === Cards === */
.card {
  background: #fff;
  border: 1px solid #e8e8e8;
  border-left: 3px solid #8c1515;  /* L1 偏好:常驻 */
  padding: 1.4rem 1.6rem;
  margin: 1.2rem 0;
}
.card h3 { margin: 0 0 0.4rem; font-size: 1.1rem; color: #1a1a1a; }
.card p { margin: 0; color: #444; font-size: 0.95rem; }

/* === Section Variants === */
.section { padding: 3rem 5%; }
.section-light { background: #f5f5f0; }

/* === Footer === */
.site-footer {
  border-top: 1px solid #e8e8e8;
  padding: 2.4rem 5%; text-align: center;
  background: #fafaf7;
}
.site-footer p {
  font-family: Arial, sans-serif;
  font-size: 0.85rem; color: #666;
  letter-spacing: 0.04em; margin: 0;
}

/* === Responsive === */
@media (max-width: 900px) {
  .feature-grid { grid-template-columns: 1fr; }
  .feature-card { border-right: none; border-bottom: 1px solid #e8e8e8; }
  .fact-strip { grid-template-columns: 1fr; }
  .fact-strip > div { border-right: none; border-bottom: 1px solid #e8e8e8; }
  .wl-grid { grid-template-columns: 1fr; }
  .wl-pillars { grid-template-columns: 1fr; }
  .stats-row { grid-template-columns: 1fr; }
  .hero-copy h1 { font-size: 3.2rem; }
  .header-inner { flex-direction: column; align-items: flex-start; }
}
@media (max-width: 600px) {
  .hero-copy { padding: 4rem 6% 2rem; }
  .hero-copy h1 { font-size: 2.6rem; }
  .content-area h2 { font-size: 1.5rem; }
  .page-header h1 { font-size: 2rem; }
}
/* === v3 页面结构样式(2026-08-20 v3 包合并)=== */
.page-hero {
  background: linear-gradient(120deg, #f5f5f0, #e8d9d9);
  color: #1a1a1a;
  padding: 5rem 10% 3.5rem;
  text-align: left;
  border-bottom: 1px solid #e8e8e8;
}
.page-hero h1 { font-size: 3.4rem; margin-bottom: 0.4rem; font-weight: normal; }
.page-hero p { color: #444; max-width: 720px; }
.page-hero .eyebrow { margin-bottom: 1rem; }

.content { max-width: 900px; margin: auto; padding: 3rem 5%; }
.content h2 {
  color: #8c1515; margin: 2rem 0 1rem;
  border-left: 3px solid #8c1515; padding-left: 1rem;
  font-weight: normal; font-size: 1.7rem;
}
.content p { margin-bottom: 1rem; color: #222; }
.content ul { margin: 1rem 0 1rem 1.5rem; }
.content li { margin-bottom: 0.5rem; color: #222; }
.content blockquote {
  background: #f5f5f0; padding: 1.2rem 1.5rem;
  border-left: 4px solid #8c1515; margin: 1rem 0;
  color: #222; font-style: italic;
}
.content blockquote cite {
  display: block; margin-top: 0.6rem;
  font-size: 0.85rem; color: #666; font-style: normal;
}

.milestone {
  background: #fff; padding: 1.4rem 1.6rem;
  margin: 1rem 0; border-left: 3px solid #8c1515;
  box-shadow: 0 1px 3px rgba(0,0,0,0.04);
}
.milestone h3 { color: #1a1a1a; margin-bottom: 0.4rem; font-size: 1.2rem; }
.milestone p { color: #333; margin: 0; }
.milestone .year {
  color: #8c1515; font-size: 0.85rem;
  letter-spacing: 0.08em; font-weight: bold;
  display: block; margin-bottom: 0.2rem;
}
.note { font-size: 0.9rem; color: #666; font-style: italic; }