/* 17C视频社区 - 复古电影胶片风格主样式 */
@import url('https://fonts.googleapis.com/css2?family=Noto+Serif+SC:wght@300;400;500;600;700&family=Noto+Sans+SC:wght@300;400;500&display=swap');

:root {
  --film-brown: #3a2a1a;
  --film-amber: #c8922a;
  --film-cream: #f5ead8;
  --film-dark: #1a1208;
  --film-sepia: #8b6914;
  --film-red: #8b2020;
  --film-light: #f0e0c0;
  --film-gray: #6b5a4a;
  --text-primary: #2a1f0f;
  --text-secondary: #5a4a35;
  --border-color: rgba(200,146,42,0.3);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: 'Noto Serif SC', 'STSong', '宋体', serif;
  background-color: var(--film-dark);
  color: var(--film-cream);
  line-height: 1.8;
  overflow-x: hidden;
}

/* 胶片颗粒纹理叠加 */
body::before {
  content: '';
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='0.04'/%3E%3C/svg%3E");
  pointer-events: none;
  z-index: 9999;
  opacity: 0.5;
}

/* ===== 导航 ===== */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  background: linear-gradient(180deg, rgba(26,18,8,0.97) 0%, rgba(26,18,8,0.92) 100%);
  border-bottom: 1px solid var(--border-color);
  backdrop-filter: blur(8px);
}

.header-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
}

.logo-mark {
  font-family: 'Noto Serif SC', serif;
  font-size: 28px;
  font-weight: 700;
  color: var(--film-amber);
  letter-spacing: 2px;
  text-shadow: 0 0 20px rgba(200,146,42,0.5);
}

.logo-text {
  font-size: 13px;
  color: var(--film-cream);
  opacity: 0.7;
  letter-spacing: 1px;
  line-height: 1.3;
}

.main-nav { display: flex; align-items: center; gap: 4px; }

.main-nav a {
  color: var(--film-cream);
  text-decoration: none;
  font-size: 14px;
  padding: 6px 14px;
  border-radius: 2px;
  transition: all 0.3s;
  opacity: 0.85;
  letter-spacing: 0.5px;
}

.main-nav a:hover, .main-nav a.active {
  color: var(--film-amber);
  opacity: 1;
  background: rgba(200,146,42,0.1);
}

.nav-toggle { display: none; cursor: pointer; flex-direction: column; gap: 5px; }
.nav-toggle span { display: block; width: 24px; height: 2px; background: var(--film-cream); transition: 0.3s; }

/* ===== 搜索框 ===== */
.search-bar-wrap {
  background: rgba(58,42,26,0.6);
  border-bottom: 1px solid var(--border-color);
  padding: 10px 24px;
  display: flex;
  justify-content: center;
  margin-top: 64px;
}

.search-bar-inner {
  max-width: 640px;
  width: 100%;
  position: relative;
}

.search-input {
  width: 100%;
  padding: 10px 48px 10px 18px;
  background: rgba(26,18,8,0.8);
  border: 1px solid var(--border-color);
  border-radius: 24px;
  color: var(--film-cream);
  font-family: inherit;
  font-size: 14px;
  outline: none;
  transition: border-color 0.3s;
}

.search-input::placeholder { color: rgba(245,234,216,0.4); }
.search-input:focus { border-color: var(--film-amber); }

.search-btn {
  position: absolute;
  right: 12px;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  color: var(--film-amber);
  cursor: pointer;
  font-size: 16px;
  padding: 4px;
}

/* ===== Hero Banner ===== */
.hero {
  position: relative;
  height: 100vh;
  min-height: 600px;
  max-height: 900px;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  filter: sepia(0.4) brightness(0.55);
  transform: scale(1.05);
  transition: transform 8s ease;
}

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

/* 胶片边框效果 */
.hero::before, .hero::after {
  content: '';
  position: absolute;
  left: 0; right: 0;
  height: 40px;
  z-index: 3;
  background: repeating-linear-gradient(
    90deg,
    var(--film-dark) 0px, var(--film-dark) 8px,
    transparent 8px, transparent 16px,
    var(--film-dark) 16px, var(--film-dark) 24px
  );
}
.hero::before { top: 0; }
.hero::after { bottom: 0; }

.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    180deg,
    rgba(26,18,8,0.3) 0%,
    rgba(26,18,8,0.1) 40%,
    rgba(26,18,8,0.6) 80%,
    rgba(26,18,8,0.9) 100%
  );
  z-index: 1;
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  padding: 0 24px;
  max-width: 800px;
}

.hero-tag {
  display: inline-block;
  font-size: 12px;
  letter-spacing: 4px;
  color: var(--film-amber);
  border: 1px solid var(--film-amber);
  padding: 4px 16px;
  margin-bottom: 24px;
  text-transform: uppercase;
}

.hero-title {
  font-size: clamp(36px, 6vw, 72px);
  font-weight: 700;
  line-height: 1.2;
  color: var(--film-cream);
  text-shadow: 0 2px 20px rgba(0,0,0,0.8);
  margin-bottom: 16px;
}

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

.hero-subtitle {
  font-size: clamp(14px, 2vw, 18px);
  color: rgba(245,234,216,0.8);
  margin-bottom: 40px;
  font-weight: 300;
  letter-spacing: 1px;
}

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

.btn-primary {
  display: inline-block;
  padding: 12px 32px;
  background: var(--film-amber);
  color: var(--film-dark);
  text-decoration: none;
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 1px;
  transition: all 0.3s;
  border: 2px solid var(--film-amber);
}

.btn-primary:hover {
  background: transparent;
  color: var(--film-amber);
}

.btn-outline {
  display: inline-block;
  padding: 12px 32px;
  background: transparent;
  color: var(--film-cream);
  text-decoration: none;
  font-size: 15px;
  letter-spacing: 1px;
  border: 2px solid rgba(245,234,216,0.5);
  transition: all 0.3s;
}

.btn-outline:hover {
  border-color: var(--film-amber);
  color: var(--film-amber);
}

/* ===== 通用区块 ===== */
.section {
  padding: 80px 24px;
  max-width: 1280px;
  margin: 0 auto;
}

.section-full {
  padding: 80px 24px;
  background: rgba(58,42,26,0.2);
}

.section-inner {
  max-width: 1280px;
  margin: 0 auto;
}

.section-header {
  text-align: center;
  margin-bottom: 56px;
}

.section-tag {
  display: inline-block;
  font-size: 11px;
  letter-spacing: 4px;
  color: var(--film-amber);
  text-transform: uppercase;
  margin-bottom: 12px;
}

.section-title {
  font-size: clamp(24px, 3vw, 36px);
  font-weight: 600;
  color: var(--film-cream);
  margin-bottom: 12px;
}

.section-desc {
  font-size: 15px;
  color: rgba(245,234,216,0.6);
  max-width: 560px;
  margin: 0 auto;
  font-weight: 300;
}

.divider {
  width: 60px;
  height: 2px;
  background: var(--film-amber);
  margin: 16px auto;
}

/* ===== 视频卡片 ===== */
.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}

.video-card {
  background: rgba(58,42,26,0.4);
  border: 1px solid var(--border-color);
  overflow: hidden;
  transition: transform 0.3s, box-shadow 0.3s;
  cursor: pointer;
}

.video-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(200,146,42,0.2);
}

.video-thumb {
  position: relative;
  width: 100%;
  padding-top: 56.25%;
  overflow: hidden;
  background: #0a0804;
}

.video-thumb img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s, filter 0.5s;
  filter: sepia(0.2);
}

.video-card:hover .video-thumb img {
  transform: scale(1.05);
  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,
    transparent,
    transparent 2px,
    rgba(0,0,0,0.03) 2px,
    rgba(0,0,0,0.03) 4px
  );
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.3s;
}

.video-card:hover .video-thumb::after { opacity: 1; }

.play-btn {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) scale(0.8);
  width: 56px;
  height: 56px;
  background: rgba(200,146,42,0.9);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: all 0.3s;
  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(--film-dark);
  margin-left: 4px;
}

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

/* 老电影光晕效果 */
.film-flare {
  position: absolute;
  top: 20%;
  right: 20%;
  width: 80px;
  height: 80px;
  background: radial-gradient(circle, rgba(255,220,100,0.6) 0%, transparent 70%);
  border-radius: 50%;
  opacity: 0;
  transition: opacity 0.4s;
  pointer-events: none;
  z-index: 1;
}

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

.video-duration {
  position: absolute;
  bottom: 8px;
  right: 8px;
  background: rgba(26,18,8,0.85);
  color: var(--film-cream);
  font-size: 12px;
  padding: 2px 8px;
  border-radius: 2px;
}

.video-info { padding: 16px; }

.video-title {
  font-size: 15px;
  font-weight: 500;
  color: var(--film-cream);
  margin-bottom: 8px;
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.video-meta {
  display: flex;
  gap: 16px;
  font-size: 12px;
  color: rgba(245,234,216,0.5);
}

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

/* ===== 品牌故事 ===== */
.story-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: center;
}

.story-img {
  position: relative;
  overflow: hidden;
}

.story-img img {
  width: 100%;
  height: 400px;
  object-fit: cover;
  filter: sepia(0.3);
  display: block;
}

.story-img::before {
  content: '';
  position: absolute;
  inset: 12px;
  border: 1px solid var(--film-amber);
  z-index: 1;
  pointer-events: none;
  opacity: 0.4;
}

.story-text h2 {
  font-size: 28px;
  color: var(--film-cream);
  margin-bottom: 20px;
  line-height: 1.4;
}

.story-text p {
  color: rgba(245,234,216,0.7);
  margin-bottom: 16px;
  font-size: 15px;
  line-height: 1.9;
}

.story-text .quote {
  border-left: 3px solid var(--film-amber);
  padding-left: 20px;
  font-style: italic;
  color: var(--film-amber);
  font-size: 16px;
  margin: 24px 0;
}

/* ===== 影像墙 ===== */
.gallery-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}

.gallery-item {
  position: relative;
  overflow: hidden;
  aspect-ratio: 4/3;
}

.gallery-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: sepia(0.25) brightness(0.9);
  transition: all 0.5s;
}

.gallery-item:hover img {
  filter: sepia(0.1) brightness(1);
  transform: scale(1.05);
}

.gallery-item-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 50%, rgba(26,18,8,0.8) 100%);
  opacity: 0;
  transition: opacity 0.3s;
  display: flex;
  align-items: flex-end;
  padding: 16px;
}

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

.gallery-item-title {
  color: var(--film-cream);
  font-size: 14px;
}

/* ===== AI模块 ===== */
.ai-section {
  background: linear-gradient(135deg, rgba(26,18,8,0.9) 0%, rgba(58,42,26,0.5) 100%);
  border: 1px solid var(--border-color);
  padding: 60px 40px;
  text-align: center;
}

.ai-tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 20px;
  margin-top: 40px;
}

.ai-tool-card {
  background: rgba(58,42,26,0.5);
  border: 1px solid var(--border-color);
  padding: 24px 16px;
  text-align: center;
  transition: all 0.3s;
}

.ai-tool-card:hover {
  border-color: var(--film-amber);
  background: rgba(200,146,42,0.1);
}

.ai-tool-icon {
  font-size: 32px;
  margin-bottom: 12px;
  display: block;
}

.ai-tool-name {
  font-size: 15px;
  color: var(--film-cream);
  margin-bottom: 8px;
}

.ai-tool-desc {
  font-size: 13px;
  color: rgba(245,234,216,0.5);
}

/* ===== 达人模块 ===== */
.creators-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 24px;
}

.creator-card {
  text-align: center;
  padding: 24px 16px;
  background: rgba(58,42,26,0.3);
  border: 1px solid var(--border-color);
  transition: all 0.3s;
}

.creator-card:hover {
  border-color: var(--film-amber);
  transform: translateY(-4px);
}

.creator-avatar {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  object-fit: cover;
  filter: sepia(0.2);
  border: 2px solid var(--film-amber);
  margin: 0 auto 12px;
  display: block;
}

.creator-name {
  font-size: 16px;
  color: var(--film-cream);
  margin-bottom: 4px;
}

.creator-role {
  font-size: 12px;
  color: var(--film-amber);
  margin-bottom: 8px;
}

.creator-desc {
  font-size: 13px;
  color: rgba(245,234,216,0.5);
  line-height: 1.6;
}

/* ===== 用户评价 ===== */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 24px;
}

.review-card {
  background: rgba(58,42,26,0.3);
  border: 1px solid var(--border-color);
  padding: 24px;
  position: relative;
}

.review-card::before {
  content: '\201C';
  position: absolute;
  top: 12px;
  left: 20px;
  font-size: 60px;
  color: var(--film-amber);
  opacity: 0.3;
  font-family: serif;
  line-height: 1;
}

.review-text {
  font-size: 14px;
  color: rgba(245,234,216,0.8);
  line-height: 1.8;
  margin-bottom: 16px;
  padding-top: 16px;
}

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

.review-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--film-amber);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  color: var(--film-dark);
  font-weight: 600;
  flex-shrink: 0;
}

.review-name { font-size: 14px; color: var(--film-cream); }
.review-date { font-size: 12px; color: rgba(245,234,216,0.4); }

.stars { color: var(--film-amber); font-size: 12px; margin-bottom: 4px; }

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

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

.faq-question {
  padding: 20px 0;
  font-size: 15px;
  color: var(--film-cream);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  transition: color 0.3s;
}

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

.faq-icon {
  width: 20px;
  height: 20px;
  border: 1px solid var(--film-amber);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-size: 14px;
  color: var(--film-amber);
  transition: transform 0.3s;
}

.faq-item.open .faq-icon { transform: rotate(45deg); }

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease;
}

.faq-answer-inner {
  padding: 0 0 20px;
  font-size: 14px;
  color: rgba(245,234,216,0.6);
  line-height: 1.8;
}

.faq-item.open .faq-answer { max-height: 300px; }

/* ===== 合作模块 ===== */
.partners-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 20px;
  margin-bottom: 60px;
}

.partner-item {
  background: rgba(58,42,26,0.3);
  border: 1px solid var(--border-color);
  padding: 20px;
  text-align: center;
  font-size: 14px;
  color: rgba(245,234,216,0.6);
  transition: all 0.3s;
}

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

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

.contact-item {
  text-align: center;
  padding: 32px 24px;
  background: rgba(58,42,26,0.3);
  border: 1px solid var(--border-color);
}

.contact-icon {
  font-size: 36px;
  margin-bottom: 16px;
  display: block;
}

.contact-label {
  font-size: 13px;
  color: var(--film-amber);
  letter-spacing: 2px;
  margin-bottom: 8px;
}

.contact-value {
  font-size: 15px;
  color: var(--film-cream);
}

/* ===== 页脚 ===== */
.site-footer {
  background: var(--film-dark);
  border-top: 1px solid var(--border-color);
  padding: 48px 24px 24px;
}

.footer-inner {
  max-width: 1280px;
  margin: 0 auto;
}

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

.footer-brand .logo-mark { font-size: 24px; display: block; margin-bottom: 12px; }

.footer-brand p {
  font-size: 13px;
  color: rgba(245,234,216,0.5);
  line-height: 1.8;
  margin-bottom: 16px;
}

.footer-col h4 {
  font-size: 14px;
  color: var(--film-amber);
  margin-bottom: 16px;
  letter-spacing: 1px;
}

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

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

.footer-col ul li a {
  font-size: 13px;
  color: rgba(245,234,216,0.5);
  text-decoration: none;
  transition: color 0.3s;
}

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

.footer-bottom {
  border-top: 1px solid var(--border-color);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}

.footer-copy {
  font-size: 12px;
  color: rgba(245,234,216,0.4);
}

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

.footer-links a {
  font-size: 12px;
  color: rgba(245,234,216,0.4);
  text-decoration: none;
  transition: color 0.3s;
}

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

/* ===== 内页Banner ===== */
.page-banner {
  position: relative;
  height: 320px;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-top: 64px;
}

.page-banner-bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  filter: sepia(0.4) brightness(0.5);
}

.page-banner-overlay {
  position: absolute;
  inset: 0;
  background: rgba(26,18,8,0.5);
}

.page-banner-content {
  position: relative;
  z-index: 2;
  text-align: center;
}

.page-banner h1 {
  font-size: clamp(28px, 4vw, 48px);
  color: var(--film-cream);
  margin-bottom: 12px;
}

.breadcrumb {
  font-size: 13px;
  color: rgba(245,234,216,0.6);
}

.breadcrumb a {
  color: var(--film-amber);
  text-decoration: none;
}

/* ===== 分页 ===== */
.pagination {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-top: 48px;
}

.page-btn {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border-color);
  color: rgba(245,234,216,0.6);
  text-decoration: none;
  font-size: 14px;
  transition: all 0.3s;
}

.page-btn:hover, .page-btn.active {
  border-color: var(--film-amber);
  color: var(--film-amber);
  background: rgba(200,146,42,0.1);
}

/* ===== 更新时间 ===== */
.update-time {
  font-size: 12px;
  color: rgba(245,234,216,0.4);
  margin-top: 4px;
}

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
  .footer-top { grid-template-columns: 1fr 1fr; }
  .story-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  .main-nav { display: none; flex-direction: column; position: absolute; top: 64px; left: 0; right: 0; background: rgba(26,18,8,0.98); padding: 16px; border-bottom: 1px solid var(--border-color); }
  .main-nav.open { display: flex; }
  .main-nav a { padding: 12px 16px; border-bottom: 1px solid var(--border-color); }
  .nav-toggle { display: flex; }
  .gallery-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-top { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .contact-grid { grid-template-columns: 1fr; }
  .creators-grid { grid-template-columns: repeat(2, 1fr); }
  .video-grid { grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); }
  .search-bar-wrap { padding: 10px 16px; }
}

@media (max-width: 480px) {
  .gallery-grid { grid-template-columns: 1fr; }
  .hero-btns { flex-direction: column; align-items: center; }
  .reviews-grid { grid-template-columns: 1fr; }
}