/* ===================================================
   91网 - 复古电影胶片风格主样式表
   =================================================== */

/* 字体与基础变量 */
@import url('https://fonts.googleapis.com/css2?family=Noto+Serif+SC:wght@300;400;600;700&family=ZCOOL+XiaoWei&display=swap');

:root {
  --color-bg: #1a1208;
  --color-surface: #231a0e;
  --color-card: #2c2010;
  --color-border: #4a3520;
  --color-gold: #c9a84c;
  --color-gold-light: #e8c97a;
  --color-cream: #f0e6cc;
  --color-sepia: #8b6914;
  --color-dark-red: #7a1f1f;
  --color-text: #d4c4a0;
  --color-text-muted: #8a7a5a;
  --color-white: #f5edd8;
  --font-serif: 'Noto Serif SC', 'ZCOOL XiaoWei', Georgia, serif;
  --font-mono: 'Courier New', Courier, monospace;
  --grain-opacity: 0.04;
  --transition: 0.35s ease;
}

/* 全局重置 */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  background-color: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-serif);
  line-height: 1.8;
  overflow-x: hidden;
  position: relative;
}

/* 胶片颗粒纹理叠加层 */
body::before {
  content: '';
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 100%;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='0.08'/%3E%3C/svg%3E");
  pointer-events: none;
  z-index: 9999;
  opacity: 0.5;
}

/* 链接 */
a {
  color: var(--color-gold);
  text-decoration: none;
  transition: color var(--transition);
}
a:hover { color: var(--color-gold-light); }

/* 图片 */
img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* 容器 */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* ===== 顶部导航 ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(26, 18, 8, 0.97);
  border-bottom: 1px solid var(--color-border);
  backdrop-filter: blur(8px);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 20px;
  max-width: 1200px;
  margin: 0 auto;
}

.site-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.logo-text {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--color-gold);
  font-family: var(--font-serif);
  letter-spacing: 2px;
  text-shadow: 0 0 20px rgba(201, 168, 76, 0.4);
}

.logo-sub {
  font-size: 0.7rem;
  color: var(--color-text-muted);
  letter-spacing: 1px;
  display: block;
  margin-top: -4px;
}

.main-nav {
  display: flex;
  gap: 0;
  list-style: none;
}

.main-nav li a {
  display: block;
  padding: 8px 14px;
  color: var(--color-text);
  font-size: 0.88rem;
  letter-spacing: 1px;
  transition: all var(--transition);
  position: relative;
}

.main-nav li a::after {
  content: '';
  position: absolute;
  bottom: 0; left: 50%;
  transform: translateX(-50%);
  width: 0; height: 2px;
  background: var(--color-gold);
  transition: width var(--transition);
}

.main-nav li a:hover,
.main-nav li a.active {
  color: var(--color-gold);
}

.main-nav li a:hover::after,
.main-nav li a.active::after {
  width: 80%;
}

/* 汉堡菜单 */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 5px;
}

.nav-toggle span {
  display: block;
  width: 24px; height: 2px;
  background: var(--color-gold);
  transition: all var(--transition);
}

/* ===== 搜索框 ===== */
.search-bar {
  background: rgba(44, 32, 16, 0.8);
  border-bottom: 1px solid var(--color-border);
  padding: 10px 0;
}

.search-inner {
  max-width: 600px;
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  gap: 0;
}

.search-input {
  flex: 1;
  background: rgba(26, 18, 8, 0.9);
  border: 1px solid var(--color-border);
  border-right: none;
  color: var(--color-text);
  padding: 8px 16px;
  font-family: var(--font-serif);
  font-size: 0.9rem;
  outline: none;
  transition: border-color var(--transition);
}

.search-input::placeholder {
  color: var(--color-text-muted);
}

.search-input:focus {
  border-color: var(--color-gold);
}

.search-btn {
  background: var(--color-gold);
  border: 1px solid var(--color-gold);
  color: var(--color-bg);
  padding: 8px 20px;
  cursor: pointer;
  font-family: var(--font-serif);
  font-size: 0.9rem;
  font-weight: 600;
  transition: all var(--transition);
}

.search-btn:hover {
  background: var(--color-gold-light);
}

/* ===== 首屏Banner ===== */
.hero-banner {
  position: relative;
  height: 90vh;
  min-height: 500px;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  filter: sepia(0.3) brightness(0.5);
  transform: scale(1.05);
  transition: transform 8s ease;
}

.hero-banner:hover .hero-bg {
  transform: scale(1.0);
}

/* 胶片边框效果 */
.hero-banner::before,
.hero-banner::after {
  content: '';
  position: absolute;
  top: 0; bottom: 0;
  width: 40px;
  background: repeating-linear-gradient(
    to bottom,
    var(--color-bg) 0px,
    var(--color-bg) 8px,
    transparent 8px,
    transparent 16px,
    var(--color-bg) 16px,
    var(--color-bg) 24px,
    transparent 24px,
    transparent 32px
  );
  z-index: 2;
}
.hero-banner::before { left: 0; }
.hero-banner::after { right: 0; }

/* 渐变遮罩 */
.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    to bottom,
    rgba(26,18,8,0.3) 0%,
    rgba(26,18,8,0.1) 40%,
    rgba(26,18,8,0.7) 80%,
    rgba(26,18,8,0.95) 100%
  );
  z-index: 1;
}

.hero-content {
  position: relative;
  z-index: 3;
  text-align: center;
  padding: 0 20px;
  max-width: 800px;
}

.hero-tag {
  display: inline-block;
  border: 1px solid var(--color-gold);
  color: var(--color-gold);
  padding: 4px 16px;
  font-size: 0.75rem;
  letter-spacing: 4px;
  text-transform: uppercase;
  margin-bottom: 20px;
}

.hero-title {
  font-size: clamp(2rem, 6vw, 4rem);
  font-weight: 700;
  color: var(--color-white);
  line-height: 1.2;
  margin-bottom: 16px;
  text-shadow: 0 2px 20px rgba(0,0,0,0.8);
}

.hero-title span {
  color: var(--color-gold);
}

.hero-subtitle {
  font-size: 1.1rem;
  color: var(--color-text);
  margin-bottom: 36px;
  font-style: italic;
}

.hero-buttons {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

.btn-primary {
  background: var(--color-gold);
  color: var(--color-bg);
  padding: 12px 32px;
  font-family: var(--font-serif);
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: 2px;
  border: none;
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none;
  display: inline-block;
}

.btn-primary:hover {
  background: var(--color-gold-light);
  color: var(--color-bg);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(201, 168, 76, 0.3);
}

.btn-outline {
  background: transparent;
  color: var(--color-white);
  padding: 12px 32px;
  font-family: var(--font-serif);
  font-size: 0.95rem;
  letter-spacing: 2px;
  border: 1px solid var(--color-white);
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none;
  display: inline-block;
}

.btn-outline:hover {
  background: rgba(255,255,255,0.1);
  color: var(--color-white);
  transform: translateY(-2px);
}

/* ===== 通用区块标题 ===== */
.section {
  padding: 80px 0;
}

.section-alt {
  background: var(--color-surface);
}

.section-header {
  text-align: center;
  margin-bottom: 50px;
}

.section-tag {
  display: inline-block;
  color: var(--color-gold);
  font-size: 0.75rem;
  letter-spacing: 4px;
  text-transform: uppercase;
  margin-bottom: 12px;
}

.section-title {
  font-size: clamp(1.5rem, 3vw, 2.2rem);
  font-weight: 700;
  color: var(--color-white);
  margin-bottom: 12px;
}

.section-desc {
  color: var(--color-text-muted);
  font-size: 0.95rem;
  max-width: 500px;
  margin: 0 auto;
}

.section-divider {
  width: 60px;
  height: 2px;
  background: linear-gradient(to right, transparent, var(--color-gold), transparent);
  margin: 16px auto 0;
}

/* ===== 视频卡片 ===== */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 24px;
}

.video-card {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  overflow: hidden;
  transition: all var(--transition);
  position: relative;
  cursor: pointer;
}

.video-card:hover {
  transform: translateY(-6px);
  border-color: var(--color-gold);
  box-shadow: 0 12px 40px rgba(201, 168, 76, 0.15);
}

.video-thumb {
  position: relative;
  overflow: hidden;
  aspect-ratio: 3/2;
}

.video-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
  filter: sepia(0.2);
}

.video-card:hover .video-thumb img {
  transform: scale(1.08);
  filter: sepia(0.1);
}

/* 胶片颗粒悬停效果 */
.video-thumb::after {
  content: '';
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(
    0deg,
    rgba(0,0,0,0) 0px,
    rgba(0,0,0,0) 2px,
    rgba(0,0,0,0.03) 2px,
    rgba(0,0,0,0.03) 4px
  );
  opacity: 0;
  transition: opacity var(--transition);
  pointer-events: none;
}

.video-card:hover .video-thumb::after {
  opacity: 1;
  animation: filmGrain 0.15s steps(2) infinite;
}

@keyframes filmGrain {
  0% { transform: translate(0, 0); }
  25% { transform: translate(-1px, 1px); }
  50% { transform: translate(1px, -1px); }
  75% { transform: translate(-1px, -1px); }
  100% { transform: translate(1px, 1px); }
}

/* 播放按钮 */
.play-btn {
  position: absolute;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%) scale(0.8);
  width: 56px; height: 56px;
  background: rgba(201, 168, 76, 0.9);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: all var(--transition);
  z-index: 2;
}

.play-btn::after {
  content: '';
  width: 0; height: 0;
  border-style: solid;
  border-width: 10px 0 10px 18px;
  border-color: transparent transparent transparent var(--color-bg);
  margin-left: 4px;
}

.video-card:hover .play-btn {
  opacity: 1;
  transform: translate(-50%, -50%) scale(1);
}

/* 老电影光晕效果 */
.film-halo {
  position: absolute;
  inset: 0;
  background: radial-gradient(
    ellipse at center,
    rgba(255, 220, 120, 0) 0%,
    rgba(255, 220, 120, 0) 50%,
    rgba(0, 0, 0, 0.4) 100%
  );
  opacity: 0;
  transition: opacity 0.4s ease;
  pointer-events: none;
  z-index: 1;
}

.video-card:hover .film-halo {
  opacity: 1;
}

.video-badge {
  position: absolute;
  top: 10px; left: 10px;
  background: var(--color-dark-red);
  color: var(--color-cream);
  font-size: 0.7rem;
  padding: 3px 10px;
  letter-spacing: 1px;
  z-index: 3;
}

.video-info {
  padding: 16px;
}

.video-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-white);
  margin-bottom: 8px;
  line-height: 1.4;
}

.video-desc {
  font-size: 0.82rem;
  color: var(--color-text-muted);
  line-height: 1.6;
  margin-bottom: 12px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.video-meta {
  display: flex;
  gap: 16px;
  font-size: 0.78rem;
  color: var(--color-text-muted);
}

.video-meta span {
  display: flex;
  align-items: center;
  gap: 4px;
}

/* ===== 品牌故事模块 ===== */
.story-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.story-image {
  position: relative;
}

.story-image img {
  width: 100%;
  filter: sepia(0.3);
  border: 1px solid var(--color-border);
}

.story-image::before {
  content: '';
  position: absolute;
  top: 16px; left: 16px;
  right: -16px; bottom: -16px;
  border: 1px solid var(--color-gold);
  z-index: -1;
  opacity: 0.4;
}

.story-content h2 {
  font-size: 1.8rem;
  color: var(--color-white);
  margin-bottom: 20px;
}

.story-content p {
  color: var(--color-text);
  margin-bottom: 16px;
  font-size: 0.95rem;
  line-height: 1.9;
}

.story-quote {
  border-left: 3px solid var(--color-gold);
  padding-left: 20px;
  margin: 24px 0;
  font-style: italic;
  color: var(--color-gold-light);
  font-size: 1.05rem;
}

/* ===== 影像作品墙 ===== */
.gallery-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 4px;
}

.gallery-item {
  position: relative;
  overflow: hidden;
  aspect-ratio: 1;
  cursor: pointer;
}

.gallery-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: sepia(0.4) brightness(0.8);
  transition: all 0.5s ease;
}

.gallery-item:hover img {
  filter: sepia(0.1) brightness(1);
  transform: scale(1.1);
}

.gallery-item-overlay {
  position: absolute;
  inset: 0;
  background: rgba(26, 18, 8, 0.6);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity var(--transition);
}

.gallery-item:hover .gallery-item-overlay {
  opacity: 1;
}

.gallery-item-overlay span {
  color: var(--color-gold);
  font-size: 0.85rem;
  letter-spacing: 2px;
  text-align: center;
  padding: 0 10px;
}

/* ===== AI模块 ===== */
.ai-features {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.ai-feature-card {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  padding: 32px 24px;
  text-align: center;
  transition: all var(--transition);
}

.ai-feature-card:hover {
  border-color: var(--color-gold);
  transform: translateY(-4px);
}

.ai-icon {
  width: 56px; height: 56px;
  background: linear-gradient(135deg, var(--color-gold), var(--color-sepia));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
  font-size: 1.5rem;
}

.ai-feature-card h3 {
  color: var(--color-white);
  font-size: 1rem;
  margin-bottom: 12px;
}

.ai-feature-card p {
  color: var(--color-text-muted);
  font-size: 0.85rem;
  line-height: 1.7;
}

/* ===== 达人模块 ===== */
.creators-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.creator-card {
  text-align: center;
  padding: 24px 16px;
  background: var(--color-card);
  border: 1px solid var(--color-border);
  transition: all var(--transition);
}

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

.creator-avatar {
  width: 80px; height: 80px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-sepia), var(--color-dark-red));
  margin: 0 auto 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  border: 2px solid var(--color-border);
  overflow: hidden;
}

.creator-name {
  color: var(--color-white);
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 6px;
}

.creator-role {
  color: var(--color-gold);
  font-size: 0.78rem;
  letter-spacing: 1px;
  margin-bottom: 10px;
}

.creator-desc {
  color: var(--color-text-muted);
  font-size: 0.8rem;
  line-height: 1.6;
}

/* ===== 用户评价 ===== */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.review-card {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  padding: 28px 24px;
  position: relative;
  transition: all var(--transition);
}

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

.review-card::before {
  content: '\201C';
  position: absolute;
  top: 16px; left: 20px;
  font-size: 4rem;
  color: var(--color-gold);
  opacity: 0.2;
  font-family: Georgia, serif;
  line-height: 1;
}

.review-text {
  color: var(--color-text);
  font-size: 0.9rem;
  line-height: 1.8;
  margin-bottom: 20px;
  font-style: italic;
}

.review-author {
  display: flex;
  align-items: center;
  gap: 12px;
}

.review-avatar {
  width: 40px; height: 40px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-gold), var(--color-sepia));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  flex-shrink: 0;
}

.review-name {
  color: var(--color-white);
  font-size: 0.88rem;
  font-weight: 600;
}

.review-stars {
  color: var(--color-gold);
  font-size: 0.75rem;
  margin-top: 2px;
}

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

.faq-item {
  border-bottom: 1px solid var(--color-border);
}

.faq-question {
  width: 100%;
  background: none;
  border: none;
  color: var(--color-white);
  font-family: var(--font-serif);
  font-size: 0.95rem;
  text-align: left;
  padding: 20px 0;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  transition: color var(--transition);
}

.faq-question:hover {
  color: var(--color-gold);
}

.faq-icon {
  flex-shrink: 0;
  width: 20px; height: 20px;
  border: 1px solid var(--color-border);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8rem;
  color: var(--color-gold);
  transition: all var(--transition);
}

.faq-item.open .faq-icon {
  background: var(--color-gold);
  color: var(--color-bg);
  transform: rotate(45deg);
}

.faq-answer {
  display: none;
  padding: 0 0 20px;
  color: var(--color-text-muted);
  font-size: 0.9rem;
  line-height: 1.8;
}

.faq-item.open .faq-answer {
  display: block;
}

/* ===== 合作伙伴 ===== */
.partners-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 16px;
  align-items: center;
}

.partner-item {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  padding: 20px;
  text-align: center;
  color: var(--color-text-muted);
  font-size: 0.85rem;
  transition: all var(--transition);
}

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

/* ===== 联系模块 ===== */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 32px;
}

.contact-card {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  padding: 32px 24px;
  text-align: center;
}

.contact-card h3 {
  color: var(--color-gold);
  font-size: 1rem;
  letter-spacing: 2px;
  margin-bottom: 16px;
}

.contact-card p {
  color: var(--color-text);
  font-size: 0.88rem;
  line-height: 1.8;
}

.qr-placeholder {
  width: 100px; height: 100px;
  background: var(--color-surface);
  border: 1px dashed var(--color-border);
  margin: 16px auto;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-muted);
  font-size: 0.75rem;
}

/* ===== 页脚 ===== */
.site-footer {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding: 40px 0 20px;
}

.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

.footer-top {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}

.footer-brand .logo-text {
  font-size: 1.4rem;
  display: block;
  margin-bottom: 12px;
}

.footer-brand p {
  color: var(--color-text-muted);
  font-size: 0.85rem;
  line-height: 1.7;
}

.footer-col h4 {
  color: var(--color-white);
  font-size: 0.9rem;
  letter-spacing: 2px;
  margin-bottom: 16px;
}

.footer-col ul {
  list-style: none;
}

.footer-col ul li {
  margin-bottom: 8px;
}

.footer-col ul li a {
  color: var(--color-text-muted);
  font-size: 0.85rem;
  transition: color var(--transition);
}

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

.footer-bottom {
  border-top: 1px solid var(--color-border);
  padding-top: 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}

.footer-copyright {
  color: var(--color-text-muted);
  font-size: 0.8rem;
}

.footer-links {
  display: flex;
  gap: 20px;
}

.footer-links a {
  color: var(--color-text-muted);
  font-size: 0.8rem;
}

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

/* ===== 内页标题区 ===== */
.page-hero {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  padding: 60px 0;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.page-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(
    90deg,
    rgba(201,168,76,0.03) 0px,
    rgba(201,168,76,0.03) 1px,
    transparent 1px,
    transparent 80px
  );
}

.page-hero h1 {
  font-size: clamp(1.8rem, 4vw, 3rem);
  color: var(--color-white);
  margin-bottom: 12px;
  position: relative;
}

.page-hero p {
  color: var(--color-text-muted);
  font-size: 1rem;
  position: relative;
}

.breadcrumb {
  display: flex;
  gap: 8px;
  justify-content: center;
  margin-bottom: 20px;
  font-size: 0.8rem;
  color: var(--color-text-muted);
  position: relative;
}

.breadcrumb a {
  color: var(--color-text-muted);
}

.breadcrumb a:hover {
  color: var(--color-gold);
}

.breadcrumb span {
  color: var(--color-gold);
}

/* ===== 滚动条 ===== */
::-webkit-scrollbar {
  width: 6px;
}
::-webkit-scrollbar-track {
  background: var(--color-bg);
}
::-webkit-scrollbar-thumb {
  background: var(--color-border);
  border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--color-gold);
}

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
  .gallery-grid { grid-template-columns: repeat(3, 1fr); }
  .creators-grid { grid-template-columns: repeat(2, 1fr); }
  .partners-grid { grid-template-columns: repeat(3, 1fr); }
  .footer-top { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  .main-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0; right: 0;
    background: var(--color-surface);
    border-top: 1px solid var(--color-border);
    flex-direction: column;
    padding: 10px 0;
  }
  .main-nav.open { display: flex; }
  .main-nav li a { padding: 12px 20px; }
  .nav-toggle { display: flex; }

  .story-grid { grid-template-columns: 1fr; }
  .story-image::before { display: none; }
  .ai-features { grid-template-columns: 1fr; }
  .reviews-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .gallery-grid { grid-template-columns: repeat(2, 1fr); }
  .creators-grid { grid-template-columns: repeat(2, 1fr); }
  .partners-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-top { grid-template-columns: 1fr; gap: 24px; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .cards-grid { grid-template-columns: 1fr 1fr; }
  .hero-banner { height: 70vh; }
}

@media (max-width: 480px) {
  .cards-grid { grid-template-columns: 1fr; }
  .gallery-grid { grid-template-columns: repeat(2, 1fr); }
  .creators-grid { grid-template-columns: 1fr; }
  .partners-grid { grid-template-columns: repeat(2, 1fr); }
  .hero-buttons { flex-direction: column; align-items: center; }
}

/* ===== 工具类 ===== */
.text-gold { color: var(--color-gold); }
.text-center { text-align: center; }
.mt-8 { margin-top: 8px; }
.mt-16 { margin-top: 16px; }
.mt-24 { margin-top: 24px; }
.mb-24 { margin-bottom: 24px; }
.lazy { opacity: 0; transition: opacity 0.5s ease; }
.lazy.loaded { opacity: 1; }