/* 51吃瓜 - 侘寂禅意美学主样式 */
:root {
  --color-bg: #f5f2ec;
  --color-surface: #ede9e0;
  --color-text: #2c2a26;
  --color-text-light: #6b6560;
  --color-accent: #8b7355;
  --color-muted: #a89880;
  --color-border: #d4cfc6;
  --color-fog: #b8c4c0;
  --color-ink: #1a1a18;
  --font-main: 'Noto Serif SC', 'Source Han Serif CN', Georgia, serif;
  --font-sans: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --transition: 0.4s ease;
  --radius: 2px;
  --shadow: 0 2px 20px rgba(44,42,38,0.08);
}

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

html { scroll-behavior: smooth; }

body {
  background-color: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-main);
  font-size: 16px;
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }

/* ===== HEADER / NAV ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(245,242,236,0.95);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-border);
  padding: 0 5vw;
}

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

.site-logo {
  font-size: 1.4rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--color-ink);
}

.site-logo span { color: var(--color-accent); }

.main-nav { display: flex; gap: 0; }

.main-nav a {
  display: block;
  padding: 0 1.1rem;
  font-family: var(--font-sans);
  font-size: 0.88rem;
  letter-spacing: 0.04em;
  color: var(--color-text-light);
  transition: color var(--transition);
  line-height: 64px;
}

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

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 8px;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 1.5px;
  background: var(--color-text);
  transition: var(--transition);
}

/* ===== SEARCH BAR ===== */
.search-bar-wrap {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  padding: 10px 5vw;
}

.search-bar-inner {
  max-width: 680px;
  margin: 0 auto;
  position: relative;
}

.search-bar-inner input {
  width: 100%;
  padding: 10px 48px 10px 18px;
  border: 1px solid var(--color-border);
  border-radius: 30px;
  background: var(--color-bg);
  font-family: var(--font-sans);
  font-size: 0.9rem;
  color: var(--color-text);
  outline: none;
  cursor: default;
  transition: border-color var(--transition);
}

.search-bar-inner input:focus { border-color: var(--color-muted); }

.search-bar-inner .search-icon {
  position: absolute;
  right: 16px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--color-muted);
  pointer-events: none;
}

/* ===== BANNER ===== */
.hero-banner {
  position: relative;
  height: 88vh;
  min-height: 520px;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero-banner img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: brightness(0.82) saturate(0.85);
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to bottom, rgba(30,28,24,0.18) 0%, rgba(30,28,24,0.42) 100%);
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  color: #f5f2ec;
  padding: 0 5vw;
}

.hero-content h1 {
  font-size: clamp(2rem, 5vw, 3.6rem);
  font-weight: 700;
  letter-spacing: 0.12em;
  line-height: 1.3;
  margin-bottom: 1rem;
  text-shadow: 0 2px 16px rgba(0,0,0,0.3);
}

.hero-content .sub {
  font-family: var(--font-sans);
  font-size: 1.05rem;
  letter-spacing: 0.08em;
  opacity: 0.88;
  margin-bottom: 2.4rem;
}

.btn-group { display: flex; gap: 1rem; justify-content: center; flex-wrap: wrap; }

.btn {
  display: inline-block;
  padding: 0.75rem 2.2rem;
  border-radius: var(--radius);
  font-family: var(--font-sans);
  font-size: 0.92rem;
  letter-spacing: 0.1em;
  cursor: pointer;
  transition: all var(--transition);
  border: 1px solid transparent;
}

.btn-primary {
  background: var(--color-accent);
  color: #f5f2ec;
  border-color: var(--color-accent);
}

.btn-primary:hover { background: #7a6248; }

.btn-outline {
  background: transparent;
  color: #f5f2ec;
  border-color: rgba(245,242,236,0.7);
}

.btn-outline:hover { background: rgba(245,242,236,0.12); }

/* ===== SECTION COMMON ===== */
.section {
  padding: 80px 5vw;
}

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

.section-header {
  text-align: center;
  margin-bottom: 3rem;
}

.section-header h2 {
  font-size: clamp(1.5rem, 3vw, 2.2rem);
  letter-spacing: 0.1em;
  margin-bottom: 0.6rem;
}

.section-header p {
  font-family: var(--font-sans);
  font-size: 0.95rem;
  color: var(--color-text-light);
  letter-spacing: 0.04em;
}

.section-divider {
  width: 40px;
  height: 1px;
  background: var(--color-accent);
  margin: 1rem auto 0;
}

/* ===== VIDEO CARDS ===== */
.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.6rem;
}

.video-card {
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--color-surface);
  box-shadow: var(--shadow);
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition);
}

.video-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 32px rgba(44,42,38,0.14);
}

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

.video-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s ease, filter 0.6s ease;
}

.video-card:hover .video-thumb img {
  transform: scale(1.04);
  filter: brightness(0.78) saturate(0.9);
}

/* 光影斑驳效果 */
.video-thumb::after {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 30% 40%, rgba(255,220,150,0.18) 0%, transparent 60%),
              radial-gradient(ellipse at 70% 70%, rgba(180,200,190,0.12) 0%, transparent 50%);
  opacity: 0;
  transition: opacity 0.5s ease;
  pointer-events: none;
}

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

/* 纹理呼吸效果 */
.video-thumb::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='200' height='200'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.65' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='200' height='200' filter='url(%23n)' opacity='0.04'/%3E%3C/svg%3E");
  opacity: 0;
  transition: opacity 0.5s ease;
  z-index: 1;
  pointer-events: none;
}

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

.play-btn {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) scale(0.8);
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: rgba(245,242,236,0.9);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity 0.3s ease, transform 0.3s ease;
  z-index: 2;
}

.play-btn svg { width: 20px; height: 20px; fill: var(--color-accent); margin-left: 3px; }

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

.video-info {
  padding: 1rem 1.1rem 1.2rem;
}

.video-info h3 {
  font-size: 0.95rem;
  line-height: 1.5;
  margin-bottom: 0.6rem;
  letter-spacing: 0.02em;
}

.video-meta {
  display: flex;
  gap: 1rem;
  font-family: var(--font-sans);
  font-size: 0.78rem;
  color: var(--color-text-light);
}

.video-meta span { display: flex; align-items: center; gap: 3px; }

/* ===== STORY SECTION ===== */
.story-section { background: var(--color-surface); }

.story-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
  max-width: 1280px;
  margin: 0 auto;
}

.story-img {
  border-radius: var(--radius);
  overflow: hidden;
  aspect-ratio: 1/1;
}

.story-img img { width: 100%; height: 100%; object-fit: cover; }

.story-text h2 {
  font-size: clamp(1.4rem, 2.5vw, 2rem);
  letter-spacing: 0.08em;
  margin-bottom: 1.2rem;
}

.story-text p {
  font-family: var(--font-sans);
  font-size: 0.95rem;
  color: var(--color-text-light);
  line-height: 2;
  margin-bottom: 1.6rem;
}

/* ===== IMAGE WALL ===== */
.image-wall {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
}

.image-wall-item {
  position: relative;
  aspect-ratio: 1/1;
  overflow: hidden;
  border-radius: var(--radius);
}

.image-wall-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s ease;
}

.image-wall-item:hover img { transform: scale(1.06); }

.image-wall-item .caption {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 0.8rem;
  background: linear-gradient(transparent, rgba(26,26,24,0.6));
  color: #f5f2ec;
  font-family: var(--font-sans);
  font-size: 0.82rem;
  letter-spacing: 0.04em;
  transform: translateY(100%);
  transition: transform var(--transition);
}

.image-wall-item:hover .caption { transform: translateY(0); }

/* ===== AI SECTION ===== */
.ai-section { background: var(--color-ink); color: #f5f2ec; }

.ai-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
  max-width: 1280px;
  margin: 0 auto;
}

.ai-text h2 {
  font-size: clamp(1.4rem, 2.5vw, 2rem);
  letter-spacing: 0.08em;
  margin-bottom: 1rem;
}

.ai-text p {
  font-family: var(--font-sans);
  font-size: 0.95rem;
  opacity: 0.8;
  line-height: 2;
  margin-bottom: 1.6rem;
}

.ai-img { border-radius: var(--radius); overflow: hidden; }
.ai-img img { width: 100%; }

/* ===== CREATORS ===== */
.creators-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.6rem;
}

.creator-card {
  text-align: center;
  padding: 1.8rem 1rem;
  background: var(--color-surface);
  border-radius: var(--radius);
  transition: box-shadow var(--transition);
}

.creator-card:hover { box-shadow: var(--shadow); }

.creator-avatar {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  overflow: hidden;
  margin: 0 auto 1rem;
  border: 2px solid var(--color-border);
}

.creator-avatar img { width: 100%; height: 100%; object-fit: cover; }

.creator-card h3 {
  font-size: 1rem;
  letter-spacing: 0.06em;
  margin-bottom: 0.3rem;
}

.creator-card p {
  font-family: var(--font-sans);
  font-size: 0.82rem;
  color: var(--color-text-light);
}

/* ===== REVIEWS ===== */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.4rem;
}

.review-card {
  padding: 1.6rem;
  background: var(--color-surface);
  border-radius: var(--radius);
  border-left: 3px solid var(--color-accent);
}

.review-card p {
  font-family: var(--font-sans);
  font-size: 0.9rem;
  line-height: 1.9;
  color: var(--color-text-light);
  margin-bottom: 1rem;
}

.review-user {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-accent);
  letter-spacing: 0.04em;
}

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

.faq-item {
  border-bottom: 1px solid var(--color-border);
  padding: 1.2rem 0;
}

.faq-question {
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  font-family: var(--font-sans);
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  padding-right: 1rem;
  user-select: none;
}

.faq-question::after {
  content: '+';
  font-size: 1.2rem;
  color: var(--color-accent);
  transition: transform var(--transition);
  flex-shrink: 0;
}

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

.faq-answer {
  font-family: var(--font-sans);
  font-size: 0.9rem;
  color: var(--color-text-light);
  line-height: 1.9;
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, padding 0.3s ease;
}

.faq-item.open .faq-answer {
  max-height: 200px;
  padding-top: 0.8rem;
}

/* ===== PARTNERS ===== */
.partners-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  justify-content: center;
  margin-bottom: 3rem;
}

.partner-logo {
  width: 120px;
  height: 56px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-sans);
  font-size: 0.8rem;
  color: var(--color-text-light);
  letter-spacing: 0.04em;
}

/* ===== CONTACT ===== */
.contact-section { background: var(--color-surface); }

.contact-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  max-width: 1280px;
  margin: 0 auto;
}

.contact-info h2 {
  font-size: 1.6rem;
  letter-spacing: 0.08em;
  margin-bottom: 1.2rem;
}

.contact-info p {
  font-family: var(--font-sans);
  font-size: 0.92rem;
  color: var(--color-text-light);
  line-height: 2;
  margin-bottom: 0.5rem;
}

.qrcode-wrap {
  display: flex;
  gap: 1.5rem;
  align-items: flex-start;
  margin-top: 1.5rem;
}

.qrcode-item {
  text-align: center;
}

.qrcode-placeholder {
  width: 100px;
  height: 100px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  margin-bottom: 0.4rem;
}

.qrcode-item p {
  font-family: var(--font-sans);
  font-size: 0.78rem;
  color: var(--color-text-light);
}

/* ===== FOOTER ===== */
.site-footer {
  background: var(--color-ink);
  color: rgba(245,242,236,0.7);
  padding: 3rem 5vw 2rem;
}

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

.footer-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 2rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid rgba(245,242,236,0.1);
  margin-bottom: 1.5rem;
}

.footer-brand .logo {
  font-size: 1.3rem;
  font-weight: 700;
  color: #f5f2ec;
  letter-spacing: 0.06em;
  margin-bottom: 0.5rem;
}

.footer-brand p {
  font-family: var(--font-sans);
  font-size: 0.82rem;
  line-height: 1.8;
  max-width: 280px;
}

.footer-links h4 {
  color: #f5f2ec;
  font-size: 0.88rem;
  letter-spacing: 0.06em;
  margin-bottom: 0.8rem;
}

.footer-links ul li {
  margin-bottom: 0.4rem;
}

.footer-links ul li a {
  font-family: var(--font-sans);
  font-size: 0.82rem;
  transition: color var(--transition);
}

.footer-links ul li a:hover { color: #f5f2ec; }

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  font-family: var(--font-sans);
  font-size: 0.78rem;
}

.social-links { display: flex; gap: 1rem; }

.social-links a {
  width: 32px;
  height: 32px;
  border: 1px solid rgba(245,242,236,0.2);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  transition: all var(--transition);
}

.social-links a:hover {
  border-color: rgba(245,242,236,0.6);
  color: #f5f2ec;
}

/* ===== INNER PAGE HERO ===== */
.page-hero {
  position: relative;
  height: 420px;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

.page-hero img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: brightness(0.75) saturate(0.8);
}

.page-hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to bottom, rgba(26,26,24,0.2), rgba(26,26,24,0.5));
}

.page-hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  color: #f5f2ec;
}

.page-hero-content h1 {
  font-size: clamp(1.8rem, 4vw, 3rem);
  letter-spacing: 0.15em;
  margin-bottom: 0.6rem;
}

.breadcrumb {
  font-family: var(--font-sans);
  font-size: 0.85rem;
  opacity: 0.8;
  letter-spacing: 0.04em;
}

.breadcrumb a { opacity: 0.7; }
.breadcrumb a:hover { opacity: 1; }

/* ===== ARTICLE GRID ===== */
.article-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.8rem;
}

.article-card {
  background: var(--color-surface);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: transform var(--transition);
}

.article-card:hover { transform: translateY(-3px); }

.article-thumb {
  aspect-ratio: 16/9;
  overflow: hidden;
}

.article-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.article-card:hover .article-thumb img { transform: scale(1.04); }

.article-body { padding: 1.2rem 1.3rem 1.4rem; }

.article-tag {
  display: inline-block;
  font-family: var(--font-sans);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  color: var(--color-accent);
  border: 1px solid var(--color-accent);
  padding: 2px 8px;
  border-radius: 20px;
  margin-bottom: 0.6rem;
}

.article-body h3 {
  font-size: 1rem;
  line-height: 1.6;
  margin-bottom: 0.5rem;
  letter-spacing: 0.02em;
}

.article-body p {
  font-family: var(--font-sans);
  font-size: 0.85rem;
  color: var(--color-text-light);
  line-height: 1.8;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 1024px) {
  .story-inner,
  .ai-inner,
  .contact-inner { grid-template-columns: 1fr; gap: 2rem; }

  .creators-grid { grid-template-columns: repeat(2, 1fr); }
  .image-wall { grid-template-columns: repeat(2, 1fr); }
  .reviews-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .main-nav { display: none; flex-direction: column; position: absolute; top: 64px; left: 0; right: 0; background: var(--color-bg); border-bottom: 1px solid var(--color-border); padding: 1rem 5vw; }
  .main-nav.open { display: flex; }
  .main-nav a { line-height: 2.4; padding: 0; border-bottom: 1px solid var(--color-border); }
  .nav-toggle { display: flex; }
  .header-inner { position: relative; }

  .hero-banner { height: 70vh; }
  .section { padding: 50px 5vw; }
  .creators-grid { grid-template-columns: repeat(2, 1fr); }
  .reviews-grid { grid-template-columns: 1fr; }
  .video-grid { grid-template-columns: 1fr; }
  .footer-top { flex-direction: column; }
  .footer-bottom { flex-direction: column; text-align: center; }
}

@media (max-width: 480px) {
  .image-wall { grid-template-columns: repeat(2, 1fr); }
  .creators-grid { grid-template-columns: 1fr 1fr; }
  .btn-group { flex-direction: column; align-items: center; }
}