/* 17C 侘寂禅意美学 - 主样式表 */
:root {
  --color-bg: #f5f2ed;
  --color-bg2: #ede9e2;
  --color-white: #faf8f4;
  --color-text: #2c2a27;
  --color-text-light: #7a7570;
  --color-accent: #8b7355;
  --color-accent2: #5a7a72;
  --color-border: #d8d2c8;
  --color-ink: #1a1814;
  --font-main: 'Noto Serif SC', 'Source Han Serif CN', 'STSong', serif;
  --font-sans: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --transition: 0.4s ease;
}

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

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

body {
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-main);
  line-height: 1.8;
  min-height: 100vh;
}

/* ===== TYPOGRAPHY ===== */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-main);
  font-weight: 400;
  letter-spacing: 0.08em;
  line-height: 1.4;
}
h1 { font-size: clamp(1.8rem, 4vw, 3rem); }
h2 { font-size: clamp(1.4rem, 3vw, 2.2rem); }
h3 { font-size: clamp(1.1rem, 2vw, 1.5rem); }
p { margin-bottom: 1em; color: var(--color-text-light); }
a { color: inherit; text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--color-accent); }
img { max-width: 100%; height: auto; display: block; }

/* ===== LAYOUT ===== */
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
.section { padding: 80px 0; }
.section-title {
  text-align: center;
  margin-bottom: 60px;
}
.section-title h2 { color: var(--color-ink); margin-bottom: 12px; }
.section-title p { font-size: 1rem; max-width: 500px; margin: 0 auto; }
.divider {
  width: 40px; height: 1px;
  background: var(--color-accent);
  margin: 20px auto;
}

/* ===== HEADER / NAV ===== */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(245,242,237,0.95);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-border);
  padding: 0;
}
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 70px;
}
.logo {
  font-size: 1.6rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  color: var(--color-ink);
}
.logo span { color: var(--color-accent); }
.main-nav { display: flex; gap: 0; }
.main-nav a {
  display: block;
  padding: 8px 16px;
  font-size: 0.9rem;
  font-family: var(--font-sans);
  letter-spacing: 0.05em;
  color: var(--color-text);
  position: relative;
}
.main-nav a::after {
  content: '';
  position: absolute; bottom: 4px; left: 50%; right: 50%;
  height: 1px; background: var(--color-accent);
  transition: left 0.3s, right 0.3s;
}
.main-nav a:hover::after, .main-nav a.active::after { left: 16px; right: 16px; }
.nav-toggle { display: none; background: none; border: none; cursor: pointer; padding: 8px; }
.nav-toggle span {
  display: block; width: 22px; height: 1px;
  background: var(--color-ink); margin: 5px 0;
  transition: var(--transition);
}

/* ===== SEARCH BAR ===== */
.search-bar-wrap {
  background: var(--color-bg2);
  border-bottom: 1px solid var(--color-border);
  padding: 12px 0;
}
.search-bar-inner {
  display: flex; align-items: center; gap: 10px;
  max-width: 600px; margin: 0 auto; padding: 0 24px;
}
.search-input {
  flex: 1;
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: 2px;
  padding: 10px 16px;
  font-size: 0.9rem;
  font-family: var(--font-sans);
  color: var(--color-text);
  outline: none;
  transition: border-color var(--transition);
}
.search-input:focus { border-color: var(--color-accent); }
.search-input::placeholder { color: var(--color-text-light); }
.search-btn {
  background: var(--color-accent);
  color: var(--color-white);
  border: none; cursor: pointer;
  padding: 10px 20px;
  font-size: 0.85rem;
  font-family: var(--font-sans);
  letter-spacing: 0.05em;
  border-radius: 2px;
  transition: background var(--transition);
}
.search-btn:hover { background: var(--color-ink); }

/* ===== BANNER ===== */
.banner {
  position: relative;
  height: 100vh; min-height: 600px;
  overflow: hidden;
  display: flex; align-items: center; justify-content: center;
}
.banner-bg {
  position: absolute; inset: 0;
  background-size: cover; background-position: center;
  filter: brightness(0.85);
  transform: scale(1.03);
  transition: transform 8s ease;
}
.banner:hover .banner-bg { transform: scale(1); }
.banner-overlay {
  position: absolute; inset: 0;
  background: linear-gradient(to bottom, rgba(26,24,20,0.2) 0%, rgba(26,24,20,0.5) 100%);
}
.banner-content {
  position: relative; z-index: 2;
  text-align: center; color: var(--color-white);
  padding: 0 24px;
}
.banner-brand {
  font-size: clamp(3rem, 8vw, 7rem);
  font-weight: 700;
  letter-spacing: 0.3em;
  text-shadow: 0 2px 20px rgba(0,0,0,0.3);
  margin-bottom: 16px;
}
.banner-slogan {
  font-size: clamp(1rem, 2.5vw, 1.4rem);
  letter-spacing: 0.2em;
  margin-bottom: 8px;
  font-weight: 300;
}
.banner-sub {
  font-size: 0.9rem;
  letter-spacing: 0.15em;
  color: rgba(255,255,255,0.7);
  margin-bottom: 40px;
}
.banner-btns { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.btn {
  display: inline-block;
  padding: 12px 32px;
  font-size: 0.9rem;
  font-family: var(--font-sans);
  letter-spacing: 0.1em;
  border-radius: 2px;
  cursor: pointer;
  transition: all var(--transition);
}
.btn-primary {
  background: var(--color-white);
  color: var(--color-ink);
  border: 1px solid var(--color-white);
}
.btn-primary:hover { background: transparent; color: var(--color-white); }
.btn-outline {
  background: transparent;
  color: var(--color-white);
  border: 1px solid rgba(255,255,255,0.6);
}
.btn-outline:hover { background: rgba(255,255,255,0.1); }

/* ===== VIDEO CARDS ===== */
.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}
.video-card {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  overflow: hidden;
  cursor: pointer;
  transition: transform 0.4s ease, box-shadow 0.4s ease;
  position: relative;
}
.video-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(44,42,39,0.12);
}
.video-thumb {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16/9;
}
.video-thumb img {
  width: 100%; height: 100%;
  object-fit: cover;
  transition: transform 0.6s ease, filter 0.4s ease;
}
.video-card:hover .video-thumb img {
  transform: scale(1.05);
  filter: brightness(0.75) contrast(1.05);
}
/* 光影斑驳纹理呼吸效果 */
.video-thumb::before {
  content: '';
  position: absolute; inset: 0; z-index: 1;
  background: radial-gradient(ellipse at 30% 40%, rgba(255,220,150,0.15) 0%, transparent 60%),
              radial-gradient(ellipse at 70% 60%, rgba(180,160,120,0.1) 0%, transparent 50%);
  opacity: 0;
  transition: opacity 0.5s ease;
  pointer-events: none;
}
.video-card:hover .video-thumb::before { opacity: 1; }
/* 纹理叠加 */
.video-thumb::after {
  content: '';
  position: absolute; inset: 0; z-index: 1;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='100' height='100'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.65' numOctaves='3' stitchTiles='stitch'/%3E%3CfeColorMatrix type='saturate' values='0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='0.04'/%3E%3C/svg%3E");
  opacity: 0;
  transition: opacity 0.5s ease;
  pointer-events: none;
}
.video-card:hover .video-thumb::after { opacity: 1; }
.play-btn {
  position: absolute; top: 50%; left: 50%;
  transform: translate(-50%, -50%) scale(0.8);
  z-index: 2;
  width: 52px; height: 52px;
  background: rgba(255,255,255,0.9);
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  opacity: 0;
  transition: opacity 0.3s ease, transform 0.3s ease;
}
.play-btn svg { width: 20px; height: 20px; fill: var(--color-ink); margin-left: 3px; }
.video-card:hover .play-btn { opacity: 1; transform: translate(-50%, -50%) scale(1); }
.video-duration {
  position: absolute; bottom: 8px; right: 8px; z-index: 2;
  background: rgba(0,0,0,0.7);
  color: #fff; font-size: 0.75rem;
  padding: 2px 6px; border-radius: 2px;
  font-family: var(--font-sans);
}
.video-info { padding: 16px; }
.video-title {
  font-size: 0.95rem;
  color: var(--color-ink);
  margin-bottom: 10px;
  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: 0.8rem;
  color: var(--color-text-light);
  font-family: var(--font-sans);
}
.video-meta span { display: flex; align-items: center; gap: 4px; }

/* ===== STORY SECTION ===== */
.story-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}
.story-img { overflow: hidden; }
.story-img img { width: 100%; transition: transform 0.8s ease; }
.story-img:hover img { transform: scale(1.03); }
.story-text h2 { color: var(--color-ink); margin-bottom: 20px; }
.story-text p { margin-bottom: 16px; }

/* ===== GALLERY ===== */
.gallery-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}
.gallery-item {
  overflow: hidden;
  aspect-ratio: 4/3;
  cursor: pointer;
}
.gallery-item img {
  width: 100%; height: 100%;
  object-fit: cover;
  transition: transform 0.6s ease, filter 0.4s ease;
}
.gallery-item:hover img { transform: scale(1.06); filter: brightness(0.9); }

/* ===== AI SECTION ===== */
.ai-section { background: var(--color-bg2); }
.ai-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; }
.ai-features { list-style: none; }
.ai-features li {
  padding: 16px 0;
  border-bottom: 1px solid var(--color-border);
  display: flex; align-items: flex-start; gap: 12px;
  font-size: 0.95rem;
}
.ai-features li:last-child { border-bottom: none; }
.ai-features .icon {
  width: 20px; height: 20px; flex-shrink: 0;
  color: var(--color-accent); margin-top: 2px;
}

/* ===== MASTERS ===== */
.masters-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 32px;
}
.master-card { text-align: center; }
.master-avatar {
  width: 80px; height: 80px;
  border-radius: 50%;
  background: var(--color-bg2);
  margin: 0 auto 12px;
  overflow: hidden;
  border: 2px solid var(--color-border);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.8rem;
}
.master-name { font-size: 1rem; color: var(--color-ink); margin-bottom: 4px; }
.master-title { font-size: 0.8rem; color: var(--color-text-light); font-family: var(--font-sans); }

/* ===== REVIEWS ===== */
.reviews-section { background: var(--color-bg2); }
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 24px;
}
.review-card {
  background: var(--color-white);
  padding: 28px;
  border: 1px solid var(--color-border);
  position: relative;
}
.review-card::before {
  content: '\201C';
  position: absolute; top: 16px; left: 20px;
  font-size: 3rem; color: var(--color-border);
  font-family: Georgia, serif; line-height: 1;
}
.review-text { font-size: 0.95rem; margin-bottom: 16px; padding-top: 20px; }
.review-user { font-size: 0.85rem; color: var(--color-accent); font-family: var(--font-sans); }

/* ===== PARTNERS ===== */
.partners-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 20px;
  margin-bottom: 60px;
}
.partner-item {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  padding: 20px;
  text-align: center;
  font-size: 0.85rem;
  color: var(--color-text-light);
  font-family: var(--font-sans);
  transition: border-color var(--transition);
}
.partner-item:hover { border-color: var(--color-accent); }

/* ===== FAQ ===== */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item {
  border-bottom: 1px solid var(--color-border);
  overflow: hidden;
}
.faq-q {
  width: 100%; text-align: left;
  background: none; border: none; cursor: pointer;
  padding: 20px 0;
  font-size: 1rem;
  font-family: var(--font-main);
  color: var(--color-ink);
  display: flex; justify-content: space-between; align-items: center;
  gap: 16px;
}
.faq-q .faq-icon {
  width: 20px; height: 20px; flex-shrink: 0;
  transition: transform 0.3s ease;
}
.faq-item.open .faq-icon { transform: rotate(45deg); }
.faq-a {
  max-height: 0; overflow: hidden;
  transition: max-height 0.4s ease, padding 0.3s ease;
  font-size: 0.9rem; color: var(--color-text-light);
  padding: 0;
}
.faq-item.open .faq-a { max-height: 200px; padding-bottom: 20px; }

/* ===== CONTACT ===== */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 40px;
}
.contact-block h3 { color: var(--color-ink); margin-bottom: 16px; font-size: 1rem; }
.contact-block p { font-size: 0.9rem; margin-bottom: 8px; }
.qr-placeholder {
  width: 100px; height: 100px;
  background: var(--color-bg2);
  border: 1px solid var(--color-border);
  display: flex; align-items: center; justify-content: center;
  font-size: 0.75rem; color: var(--color-text-light);
  font-family: var(--font-sans);
  text-align: center;
  margin-top: 12px;
}

/* ===== FOOTER ===== */
.site-footer {
  background: var(--color-ink);
  color: rgba(255,255,255,0.6);
  padding: 48px 0 24px;
}
.footer-top {
  display: flex; justify-content: space-between; align-items: flex-start;
  flex-wrap: wrap; gap: 32px;
  padding-bottom: 32px;
  border-bottom: 1px solid rgba(255,255,255,0.1);
  margin-bottom: 24px;
}
.footer-brand { font-size: 1.4rem; color: #fff; letter-spacing: 0.2em; margin-bottom: 8px; }
.footer-desc { font-size: 0.85rem; max-width: 280px; }
.footer-links { display: flex; gap: 24px; flex-wrap: wrap; }
.footer-links a { font-size: 0.85rem; color: rgba(255,255,255,0.5); transition: color var(--transition); }
.footer-links a:hover { color: #fff; }
.footer-bottom {
  display: flex; justify-content: space-between; align-items: center;
  flex-wrap: wrap; gap: 12px;
  font-size: 0.8rem;
  font-family: var(--font-sans);
}
.footer-update { color: rgba(255,255,255,0.4); }

/* ===== INNER PAGE ===== */
.page-hero {
  padding: 80px 0 60px;
  text-align: center;
  background: var(--color-bg2);
  border-bottom: 1px solid var(--color-border);
}
.page-hero h1 { color: var(--color-ink); margin-bottom: 12px; }
.breadcrumb {
  font-size: 0.85rem; color: var(--color-text-light);
  font-family: var(--font-sans);
  margin-bottom: 16px;
}
.breadcrumb a { color: var(--color-accent); }
.article-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 32px;
}
.article-card {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  overflow: hidden;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}
.article-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 30px rgba(44,42,39,0.1);
}
.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: 20px; }
.article-tag {
  font-size: 0.75rem; color: var(--color-accent);
  font-family: var(--font-sans); letter-spacing: 0.05em;
  margin-bottom: 8px;
}
.article-title { font-size: 1rem; color: var(--color-ink); margin-bottom: 8px; line-height: 1.5; }
.article-excerpt { font-size: 0.85rem; color: var(--color-text-light); line-height: 1.7; }
.article-meta {
  display: flex; gap: 16px; margin-top: 12px;
  font-size: 0.78rem; color: var(--color-text-light);
  font-family: var(--font-sans);
}

/* ===== RESPONSIVE ===== */
@media (max-width: 900px) {
  .story-grid, .ai-grid, .contact-grid { grid-template-columns: 1fr; gap: 32px; }
  .gallery-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
  .main-nav { display: none; position: absolute; top: 70px; left: 0; right: 0; background: var(--color-bg); border-bottom: 1px solid var(--color-border); flex-direction: column; padding: 8px 0; }
  .main-nav.open { display: flex; }
  .main-nav a { padding: 12px 24px; }
  .nav-toggle { display: block; }
  .header-inner { position: relative; }
  .banner-brand { letter-spacing: 0.15em; }
  .gallery-grid { grid-template-columns: 1fr; }
  .footer-top { flex-direction: column; }
  .footer-bottom { flex-direction: column; text-align: center; }
}
@media (max-width: 480px) {
  .section { padding: 50px 0; }
  .video-grid { grid-template-columns: 1fr; }
  .masters-grid { grid-template-columns: repeat(2, 1fr); }
  .reviews-grid { grid-template-columns: 1fr; }
}

/* ===== LAZY LOAD ===== */
img[data-src] { opacity: 0; transition: opacity 0.4s ease; }
img.loaded { opacity: 1; }

/* ===== SCROLL ANIMATION ===== */
.fade-in { opacity: 0; transform: translateY(20px); transition: opacity 0.6s ease, transform 0.6s ease; }
.fade-in.visible { opacity: 1; transform: none; }