/* ============================================
   虎文化收藏与民俗研究站 - 主样式表
   CSS前缀: si- (Sihu)
   设计风格: 国潮虎纹民俗风
   ============================================ */

/* --- CSS Reset & Base (Mobile-First) --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: "Source Han Serif SC", "Noto Serif SC", "SimSun", "STSong", serif;
  color: #1A1A1A;
  background-color: #FDF8F0;
  line-height: 1.85;
  min-height: 100vh;
}
img { max-width: 100%; height: auto; display: block; }
a { color: #D81E06; text-decoration: none; transition: color 0.3s ease; }
a:hover { color: #FFD700; }
ul, ol { list-style: none; }
h1, h2, h3, h4, h5, h6 {
  font-family: "ZCOOL KuaiLe", "STXingkai", "KaiTi", cursive;
  color: #1A1A1A;
  line-height: 1.4;
  margin-bottom: 0.6em;
}
h1 { font-size: 1.75rem; }
h2 { font-size: 1.45rem; }
h3 { font-size: 1.2rem; }
p { margin-bottom: 1em; text-align: justify; }

/* --- 色彩变量 --- */
:root {
  --si-red: #D81E06;
  --si-gold: #FFD700;
  --si-ink: #1A1A1A;
  --si-paper: #FDF8F0;
  --si-paper-dark: #F0E6D3;
  --si-red-dark: #A01505;
  --si-gold-dark: #C5A000;
  --si-gray: #666;
  --si-border: #D4C5A9;
}

/* --- 通用容器 --- */
.si-container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 15px;
}

.si-section {
  padding: 40px 0;
}

.si-section-title {
  text-align: center;
  font-size: 1.6rem;
  color: var(--si-red);
  margin-bottom: 10px;
  position: relative;
}

.si-section-title::after {
  content: "";
  display: block;
  width: 80px;
  height: 3px;
  background: linear-gradient(90deg, transparent, var(--si-gold), transparent);
  margin: 12px auto 0;
}

.si-section-subtitle {
  text-align: center;
  color: var(--si-gray);
  font-size: 0.95rem;
  margin-bottom: 30px;
}

/* --- 顶部导航 --- */
.si-header {
  background: linear-gradient(180deg, #FDF8F0 0%, #F5EDE0 100%);
  border-bottom: 2px solid var(--si-red);
  padding: 10px 0;
  position: relative;
  z-index: 100;
}

.si-header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
}

.si-logo {
  display: flex;
  align-items: center;
  gap: 10px;
}

.si-logo img {
  width: 48px;
  height: 48px;
  border-radius: 4px;
}

.si-logo-text {
  font-family: "ZCOOL KuaiLe", "STXingkai", cursive;
  font-size: 1.1rem;
  color: var(--si-red);
  font-weight: bold;
}

.si-logo-domain {
  font-size: 0.7rem;
  color: var(--si-gray);
  display: block;
}

/* 汉堡菜单 */
.si-hamburger {
  display: flex;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 8px;
  background: none;
  border: 1px solid var(--si-border);
  border-radius: 4px;
}

.si-hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--si-ink);
  transition: all 0.3s ease;
}

.si-hamburger.si-active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.si-hamburger.si-active span:nth-child(2) { opacity: 0; }
.si-hamburger.si-active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* 导航链接 */
.si-nav {
  display: none;
  width: 100%;
  padding: 15px 0;
}

.si-nav.si-active {
  display: block;
}

.si-nav-list {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.si-nav-link {
  display: block;
  padding: 10px 15px;
  color: var(--si-ink);
  font-size: 0.95rem;
  border-bottom: 1px solid var(--si-border);
  transition: all 0.3s ease;
  position: relative;
}

.si-nav-link:hover,
.si-nav-link.si-current {
  color: var(--si-gold);
  background: rgba(216, 30, 6, 0.05);
}

.si-nav-link::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 0;
  height: 60%;
  background: var(--si-red);
  transition: width 0.3s ease;
}

.si-nav-link:hover::before { width: 3px; }

/* 搜索与登录 */
.si-header-actions {
  display: none;
}

.si-search-box {
  display: flex;
  border: 1px solid var(--si-border);
  border-radius: 20px;
  overflow: hidden;
  background: #fff;
}

.si-search-input {
  border: none;
  padding: 6px 14px;
  font-size: 0.85rem;
  background: transparent;
  outline: none;
  width: 160px;
  font-family: inherit;
}

.si-search-btn {
  background: var(--si-red);
  color: #fff;
  border: none;
  padding: 6px 14px;
  cursor: pointer;
  font-size: 0.85rem;
  transition: background 0.3s;
}

.si-search-btn:hover { background: var(--si-red-dark); }

.si-login-btn {
  background: transparent;
  border: 1px solid var(--si-red);
  color: var(--si-red);
  padding: 6px 16px;
  border-radius: 20px;
  cursor: pointer;
  font-size: 0.85rem;
  transition: all 0.3s;
  font-family: inherit;
}

.si-login-btn:hover {
  background: var(--si-red);
  color: #fff;
}

/* --- Hero Banner 轮播 --- */
.si-hero {
  position: relative;
  width: 100%;
  height: 60vh;
  min-height: 320px;
  overflow: hidden;
  background: var(--si-ink);
}

.si-hero-slides {
  position: relative;
  width: 100%;
  height: 100%;
}

.si-hero-slide {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  transition: opacity 1s ease;
}

.si-hero-slide.si-active { opacity: 1; }

.si-hero-slide img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.si-hero-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(to bottom, rgba(0,0,0,0.2), rgba(0,0,0,0.6));
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: 20px;
}

.si-hero-title {
  color: #fff;
  font-size: 1.8rem;
  text-shadow: 2px 2px 8px rgba(0,0,0,0.7);
  margin-bottom: 10px;
}

.si-hero-subtitle {
  color: rgba(255,255,255,0.9);
  font-size: 0.95rem;
  max-width: 600px;
  text-shadow: 1px 1px 4px rgba(0,0,0,0.5);
  margin-bottom: 20px;
}

.si-hero-btn {
  display: inline-block;
  padding: 10px 30px;
  background: var(--si-red);
  color: #fff;
  border: 2px solid var(--si-gold);
  border-radius: 4px;
  font-size: 1rem;
  font-family: inherit;
  cursor: pointer;
  transition: all 0.3s;
}

.si-hero-btn:hover {
  background: var(--si-gold);
  color: var(--si-ink);
}

.si-hero-dots {
  position: absolute;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 10px;
  z-index: 10;
}

.si-hero-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: rgba(255,255,255,0.5);
  cursor: pointer;
  transition: background 0.3s;
  border: none;
}

.si-hero-dot.si-active { background: var(--si-gold); }

/* --- 视频专题区 --- */
.si-video-section {
  background: var(--si-ink);
  color: #fff;
  padding: 50px 0;
}

.si-video-section .si-section-title { color: var(--si-gold); }
.si-video-section .si-section-subtitle { color: rgba(255,255,255,0.7); }

.si-video-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

.si-video-card {
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,215,0,0.2);
  border-radius: 8px;
  overflow: hidden;
  cursor: pointer;
  transition: transform 0.3s, box-shadow 0.3s;
}

.si-video-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(255,215,0,0.15);
}

.si-video-thumb {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16/9;
}

.si-video-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.si-video-play-icon {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 56px;
  height: 56px;
  background: rgba(216, 30, 6, 0.85);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.si-video-play-icon::after {
  content: "";
  display: block;
  width: 0;
  height: 0;
  border-left: 18px solid #fff;
  border-top: 11px solid transparent;
  border-bottom: 11px solid transparent;
  margin-left: 4px;
}

.si-video-info {
  padding: 15px;
}

.si-video-info h3 {
  color: var(--si-gold);
  font-size: 1rem;
  margin-bottom: 6px;
}

.si-video-info p {
  color: rgba(255,255,255,0.6);
  font-size: 0.85rem;
}

/* 视频模态框 */
.si-modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0,0,0,0.9);
  z-index: 9999;
  justify-content: center;
  align-items: center;
}

.si-modal.si-active { display: flex; }

.si-modal-content {
  width: 90%;
  max-width: 800px;
  position: relative;
}

.si-modal-close {
  position: absolute;
  top: -40px;
  right: 0;
  color: #fff;
  font-size: 2rem;
  cursor: pointer;
  background: none;
  border: none;
  line-height: 1;
}

.si-video-player {
  width: 100%;
  border-radius: 8px;
  background: #000;
}

/* --- 民俗虎踪 --- */
.si-folklore-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 25px;
}

.si-folklore-item {
  display: flex;
  flex-direction: column;
  gap: 15px;
  padding-bottom: 25px;
  border-bottom: 1px dashed var(--si-border);
}

.si-folklore-img {
  width: 100%;
  border-radius: 8px;
  overflow: hidden;
  border: 2px solid var(--si-border);
}

.si-folklore-img img {
  width: 100%;
  height: 200px;
  object-fit: cover;
}

.si-folklore-text h3 {
  color: var(--si-red);
  margin-bottom: 8px;
}

.si-folklore-text p {
  font-size: 0.9rem;
  color: #444;
}

.si-read-more {
  display: inline-block;
  color: var(--si-red);
  font-size: 0.85rem;
  margin-top: 8px;
  border-bottom: 1px solid var(--si-red);
  transition: color 0.3s;
}

.si-read-more:hover { color: var(--si-gold); border-color: var(--si-gold); }

/* --- 虎艺藏品鉴 --- */
.si-collection-section {
  background: linear-gradient(180deg, #F5EDE0, var(--si-paper));
}

.si-collection-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

.si-collection-card {
  background: #fff;
  border: 1px solid var(--si-border);
  border-radius: 8px;
  overflow: hidden;
  transition: transform 0.3s, box-shadow 0.3s;
}

.si-collection-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 20px rgba(0,0,0,0.1);
}

.si-collection-img {
  overflow: hidden;
  aspect-ratio: 4/3;
}

.si-collection-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s;
}

.si-collection-card:hover .si-collection-img img {
  transform: scale(1.05);
}

.si-collection-info {
  padding: 15px;
}

.si-collection-info h3 {
  font-size: 1rem;
  color: var(--si-ink);
  margin-bottom: 6px;
}

.si-collection-meta {
  font-size: 0.8rem;
  color: var(--si-gray);
  margin-bottom: 8px;
}

.si-collection-info p {
  font-size: 0.88rem;
  color: #555;
}

/* --- 虎典籍考据 --- */
.si-classics-list {
  max-width: 800px;
  margin: 0 auto;
}

.si-classic-item {
  padding: 20px;
  margin-bottom: 20px;
  background: linear-gradient(135deg, #FDF8F0, #F5EDE0);
  border-left: 4px solid var(--si-red);
  border-radius: 0 8px 8px 0;
}

.si-classic-item h3 {
  color: var(--si-red);
  margin-bottom: 10px;
}

.si-classic-quote {
  font-style: italic;
  color: #555;
  padding: 10px 15px;
  border-left: 3px solid var(--si-gold);
  margin: 10px 0;
  background: rgba(255,215,0,0.05);
}

.si-classic-note {
  font-size: 0.88rem;
  color: var(--si-gray);
}

/* --- 虎脉寻踪入口 --- */
.si-map-entry {
  background: var(--si-ink);
  padding: 60px 0;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.si-map-entry-bg {
  width: 100%;
  max-width: 600px;
  margin: 0 auto 20px;
  opacity: 0.8;
  border-radius: 12px;
}

.si-map-entry h2 {
  color: var(--si-gold);
  font-size: 1.5rem;
  margin-bottom: 10px;
}

.si-map-entry p {
  color: rgba(255,255,255,0.8);
  max-width: 500px;
  margin: 0 auto 20px;
}

.si-map-btn {
  display: inline-block;
  padding: 12px 36px;
  background: linear-gradient(135deg, var(--si-red), var(--si-red-dark));
  color: #fff;
  border: 2px solid var(--si-gold);
  border-radius: 30px;
  font-size: 1rem;
  font-family: inherit;
  cursor: pointer;
  transition: all 0.3s;
  text-decoration: none;
}

.si-map-btn:hover {
  background: var(--si-gold);
  color: var(--si-ink);
}

/* --- 专家讲堂 --- */
.si-expert-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

.si-expert-card {
  display: flex;
  gap: 15px;
  padding: 20px;
  background: #fff;
  border: 1px solid var(--si-border);
  border-radius: 8px;
  transition: box-shadow 0.3s;
}

.si-expert-card:hover {
  box-shadow: 0 4px 16px rgba(0,0,0,0.08);
}

.si-expert-avatar {
  width: 70px;
  height: 70px;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid var(--si-gold);
  flex-shrink: 0;
}

.si-expert-info h3 {
  font-size: 1rem;
  color: var(--si-ink);
  margin-bottom: 4px;
}

.si-expert-title {
  font-size: 0.8rem;
  color: var(--si-red);
  margin-bottom: 6px;
}

.si-expert-info p {
  font-size: 0.85rem;
  color: #555;
}

/* --- 虎年说虎 --- */
.si-zodiac-section {
  background: linear-gradient(135deg, #FDF8F0, #F5EDE0);
}

.si-zodiac-timeline {
  position: relative;
  max-width: 700px;
  margin: 0 auto;
  padding-left: 30px;
}

.si-zodiac-timeline::before {
  content: "";
  position: absolute;
  left: 10px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--si-red);
}

.si-zodiac-item {
  position: relative;
  padding: 15px 0 15px 20px;
}

.si-zodiac-item::before {
  content: "";
  position: absolute;
  left: -24px;
  top: 20px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--si-gold);
  border: 2px solid var(--si-red);
}

.si-zodiac-year {
  font-size: 0.8rem;
  color: var(--si-red);
  font-weight: bold;
  margin-bottom: 4px;
}

.si-zodiac-item h3 {
  font-size: 1rem;
  margin-bottom: 6px;
}

.si-zodiac-item p {
  font-size: 0.88rem;
  color: #555;
}

/* --- 合作机构 --- */
.si-partners-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 15px;
  max-width: 800px;
  margin: 0 auto;
}

.si-partner-item {
  background: #fff;
  border: 1px solid var(--si-border);
  border-radius: 8px;
  padding: 15px;
  text-align: center;
  font-size: 0.85rem;
  color: var(--si-gray);
  transition: border-color 0.3s;
}

.si-partner-item:hover { border-color: var(--si-gold); }

/* --- 页脚 --- */
.si-footer {
  background: var(--si-ink);
  color: rgba(255,255,255,0.8);
  padding: 40px 0 0;
}

.si-footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 30px;
  padding-bottom: 30px;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}

.si-footer-col h4 {
  color: var(--si-gold);
  font-size: 1rem;
  margin-bottom: 15px;
  position: relative;
  padding-bottom: 8px;
}

.si-footer-col h4::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 30px;
  height: 2px;
  background: var(--si-red);
}

.si-footer-col p,
.si-footer-col li {
  font-size: 0.85rem;
  line-height: 2;
  color: rgba(255,255,255,0.6);
}

.si-footer-col a {
  color: rgba(255,255,255,0.6);
  transition: color 0.3s;
}

.si-footer-col a:hover { color: var(--si-gold); }

/* 荣誉标识区 */
.si-honors {
  padding: 25px 0;
  border-top: 1px solid rgba(255,255,255,0.1);
  border-bottom: 1px solid rgba(255,255,255,0.1);
}

.si-honors-list {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 15px;
}

.si-honor-item {
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,215,0,0.3);
  border-radius: 6px;
  padding: 8px 14px;
  font-size: 0.8rem;
  color: var(--si-gold);
  text-align: center;
}

/* 底部版权 */
.si-copyright {
  text-align: center;
  padding: 20px 0;
  font-size: 0.8rem;
  color: rgba(255,255,255,0.4);
}

.si-auth-number {
  display: block;
  margin-top: 8px;
  color: var(--si-gold);
  font-size: 0.85rem;
}

/* --- 面包屑 --- */
.si-breadcrumb {
  padding: 12px 0;
  font-size: 0.85rem;
  color: var(--si-gray);
}

.si-breadcrumb a { color: var(--si-red); }
.si-breadcrumb span { margin: 0 6px; }

/* --- 内页通用 --- */
.si-page-hero {
  position: relative;
  height: 300px;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
}

.si-page-hero img {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.si-page-hero-overlay {
  position: relative;
  z-index: 2;
  background: rgba(0,0,0,0.5);
  padding: 20px 30px;
  border-radius: 8px;
}

.si-page-hero-overlay h1 {
  color: #fff;
  font-size: 1.6rem;
  text-shadow: 2px 2px 6px rgba(0,0,0,0.5);
}

.si-article-content {
  max-width: 800px;
  margin: 0 auto;
  padding: 30px 15px;
}

.si-article-content h2 {
  color: var(--si-red);
  margin-top: 30px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--si-border);
}

.si-article-content h3 {
  color: var(--si-ink);
  margin-top: 20px;
}

.si-article-img {
  margin: 20px 0;
  border-radius: 8px;
  overflow: hidden;
  border: 2px solid var(--si-border);
}

.si-article-img img {
  width: 100%;
  height: auto;
}

.si-article-img figcaption {
  text-align: center;
  font-size: 0.8rem;
  color: var(--si-gray);
  padding: 8px;
  background: var(--si-paper-dark);
}

/* --- 交互式地图页 --- */
.si-map-container {
  width: 100%;
  max-width: 900px;
  margin: 0 auto;
}

.si-map-svg {
  width: 100%;
  height: auto;
}

.si-map-svg path {
  fill: var(--si-paper-dark);
  stroke: var(--si-border);
  stroke-width: 1;
  cursor: pointer;
  transition: fill 0.3s;
}

.si-map-svg path:hover {
  fill: rgba(216, 30, 6, 0.2);
}

.si-map-svg path.si-active {
  fill: rgba(255, 215, 0, 0.3);
  stroke: var(--si-gold);
  stroke-width: 2;
}

#si-province-info {
  margin-top: 30px;
  padding: 25px;
  background: #fff;
  border: 1px solid var(--si-border);
  border-radius: 8px;
  min-height: 200px;
  transition: opacity 0.5s ease;
}

#si-province-info.si-loading {
  opacity: 0.5;
}

/* --- APP下载页 --- */
.si-app-hero {
  background: linear-gradient(135deg, var(--si-ink), #2a1a0a);
  padding: 60px 0;
  text-align: center;
  color: #fff;
}

.si-app-mockup {
  max-width: 250px;
  margin: 0 auto 30px;
  border-radius: 20px;
  box-shadow: 0 20px 60px rgba(0,0,0,0.5);
}

.si-app-buttons {
  display: flex;
  flex-direction: column;
  gap: 15px;
  align-items: center;
  margin-top: 25px;
}

.si-app-btn {
  display: inline-block;
  padding: 14px 36px;
  border: 2px solid var(--si-gold);
  border-radius: 4px;
  color: var(--si-gold);
  font-size: 1rem;
  font-family: inherit;
  cursor: pointer;
  background: transparent;
  transition: all 0.3s;
  min-width: 200px;
  text-align: center;
  text-decoration: none;
}

.si-app-btn:hover {
  background: var(--si-gold);
  color: var(--si-ink);
}

/* --- FAQ区域 --- */
.si-faq-list {
  max-width: 800px;
  margin: 0 auto;
}

.si-faq-item {
  border: 1px solid var(--si-border);
  border-radius: 8px;
  margin-bottom: 12px;
  overflow: hidden;
}

.si-faq-question {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 15px 20px;
  background: #fff;
  cursor: pointer;
  font-weight: bold;
  color: var(--si-ink);
  transition: background 0.3s;
}

.si-faq-question:hover { background: var(--si-paper-dark); }

.si-faq-arrow {
  transition: transform 0.3s;
  font-size: 1.2rem;
  color: var(--si-red);
}

.si-faq-item.si-open .si-faq-arrow { transform: rotate(180deg); }

.si-faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease;
  padding: 0 20px;
  background: var(--si-paper);
}

.si-faq-item.si-open .si-faq-answer {
  max-height: 500px;
  padding: 15px 20px;
}

/* --- 站内公告 --- */
.si-notice-bar {
  background: linear-gradient(90deg, var(--si-red), var(--si-red-dark));
  color: #fff;
  padding: 8px 0;
  font-size: 0.85rem;
  overflow: hidden;
}

.si-notice-scroll {
  white-space: nowrap;
  animation: si-scroll 30s linear infinite;
}

@keyframes si-scroll {
  0% { transform: translateX(100%); }
  100% { transform: translateX(-100%); }
}

/* ============================================
   响应式断点
   ============================================ */

/* 768px - 平板 */
@media (min-width: 768px) {
  h1 { font-size: 2.2rem; }
  h2 { font-size: 1.7rem; }
  h3 { font-size: 1.3rem; }

  .si-hamburger { display: none; }

  .si-nav {
    display: block;
    width: auto;
    padding: 0;
  }

  .si-nav-list {
    flex-direction: row;
    gap: 0;
  }

  .si-nav-link {
    padding: 8px 12px;
    border-bottom: none;
    font-size: 0.9rem;
  }

  .si-nav-link::before { display: none; }

  .si-nav-link::after {
    content: "";
    display: block;
    width: 0;
    height: 2px;
    background: var(--si-gold);
    transition: width 0.3s;
    margin-top: 2px;
  }

  .si-nav-link:hover::after { width: 100%; }

  .si-header-actions {
    display: flex;
    gap: 10px;
    align-items: center;
  }

  .si-hero { height: 70vh; }
  .si-hero-title { font-size: 2.4rem; }
  .si-hero-subtitle { font-size: 1.1rem; }

  .si-video-grid { grid-template-columns: repeat(3, 1fr); }
  .si-folklore-list { grid-template-columns: 1fr; }

  .si-folklore-item {
    flex-direction: row;
  }

  .si-folklore-img {
    width: 280px;
    flex-shrink: 0;
  }

  .si-folklore-img img { height: 180px; }

  .si-collection-grid { grid-template-columns: repeat(2, 1fr); }
  .si-expert-grid { grid-template-columns: repeat(2, 1fr); }
  .si-partners-grid { grid-template-columns: repeat(3, 1fr); }

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

  .si-app-buttons { flex-direction: row; justify-content: center; }
}

/* 1024px - 小桌面 */
@media (min-width: 1024px) {
  .si-hero { height: 80vh; }
  .si-hero-title { font-size: 2.8rem; }

  .si-collection-grid { grid-template-columns: repeat(3, 1fr); }
  .si-expert-grid { grid-template-columns: repeat(3, 1fr); }
  .si-partners-grid { grid-template-columns: repeat(4, 1fr); }

  .si-footer-grid { grid-template-columns: repeat(4, 1fr); }

  .si-page-hero { height: 380px; }
}

/* 1440px - 大桌面 */
@media (min-width: 1440px) {
  .si-container { max-width: 1320px; }
  h1 { font-size: 2.6rem; }
  .si-hero-title { font-size: 3.2rem; }
}

/* 320px - 小屏手机 */
@media (max-width: 320px) {
  html { font-size: 14px; }
  .si-hero { min-height: 260px; }
  .si-hero-title { font-size: 1.4rem; }
}