/* Base Reset & Variables */
:root {
  --bg-primary: #f5f4f0;
  --bg-secondary: #eae6df;
  --text-primary: #1c1a19;
  --text-secondary: #66615b;
  --accent-gold: #c2a36b;
  --accent-gold-hover: #a68953;
  
  --font-en-display: 'Montserrat', sans-serif;
  --font-zh-serif: 'Noto Serif SC', serif;
  --font-zh-sans: 'Noto Sans SC', sans-serif;
  
  --container-width: 75rem; /* 1200px */
  --section-padding: 7.5rem 0; /* 120px */
}

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

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

body.zen-theme {
  font-family: var(--font-zh-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
  background-image: url("data:image/svg+xml,%3Csvg width='100' height='100' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.8' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100' height='100' filter='url(%23noise)' opacity='0.03'/%3E%3C/svg%3E");
}

.container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 1.5rem; /* 24px */
}

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

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

/* Typography */
h1, h2, h3, h4, h5 {
  font-family: var(--font-zh-serif);
  font-weight: 500;
  line-height: 1.3;
  color: var(--text-primary);
}

.section-title {
  font-size: 2.5rem; /* 40px */
  letter-spacing: 0.125rem; /* 2px */
  margin-bottom: 1.5rem; /* 24px */
}

.divider {
  width: 2.5rem; /* 40px */
  height: 0.125rem; /* 2px */
  background-color: var(--text-primary);
  margin: 0 auto 2.5rem; /* 40px */
}

.divider.left {
  margin: 0 0 2.5rem 0;
}

a {
  text-decoration: none;
  color: inherit;
  transition: all 0.3s ease;
}

/* Header */
.site-header {
  position: fixed;
  top: 0;
  width: 100%;
  padding: 1.25rem 2.5rem; /* 20px 40px */
  display: flex;
  justify-content: space-between;
  align-items: center;
  /* background: rgba(245, 244, 240, 0.85); */
  background-color: #fff;
  backdrop-filter: blur(12px);
  z-index: 100;
  border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem; /* 12px */
}

.brand-logo {
  height: 2.25rem; /* 36px，与之前的 brand-mark 保持一致高度 */
  width: auto; /* 宽度自适应 */
  object-fit: contain;
  background: transparent; /* 确保无背景色 */
}

.brand-text {
  font-family: var(--font-zh-serif);
  font-size: 1.25rem; /* 20px */
  font-weight: 600;
  letter-spacing: 0.125rem;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 2rem; /* 32px */
}

.site-nav a {
  font-size: 0.875rem; /* 14px */
  letter-spacing: 0.0625rem; /* 1px */
  position: relative;
}

.site-nav a::after {
  content: '';
  position: absolute;
  width: 0;
  height: 1px;
  bottom: -4px;
  left: 50%;
  background-color: var(--text-primary);
  transition: all 0.3s ease;
  transform: translateX(-50%);
}

.site-nav a:hover::after {
  width: 100%;
}

.site-nav .nav-btn {
  border: 1px solid var(--text-primary);
  padding: 0.5rem 1.5rem; /* 8px 24px */
  border-radius: 1.25rem; /* 20px */
}

.site-nav .nav-btn::after {
  display: none;
}

.site-nav .nav-btn:hover {
  background: var(--text-primary);
  color: var(--bg-primary);
}

/* 1. Hero Section */
.hero-section {
  position: relative;
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 1;
}

.hero-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: grayscale(80%) contrast(1.2) brightness(0.7);
  transition: transform 10s ease-out;
}

.hero-section:hover .hero-bg img {
  transform: scale(1.05);
}

.hero-content {
  position: relative;
  z-index: 2;
  color: #fff;
  display: flex;
  align-items: flex-start; /* 将整体对齐方式改为靠上 */
  justify-content: flex-start; /* 将整体对齐方式改为靠左 */
  /* height: 100%; */
  padding-top: 10rem; /* 增加顶部内边距，使其不要贴着导航栏，而是处于左上角的黄金分割点附近 */
}

.hero-text-box {
  /* 添加半透明渐变背景与轻微模糊，提升文字可读性且不突兀 */
  background: linear-gradient(to right, rgba(20, 18, 17, 0.6) 0%, rgba(20, 18, 17, 0) 100%);
  backdrop-filter: blur(4px);
  padding: 3rem 4rem;
  border-left: 2px solid var(--accent-gold);
  border-radius: 0.5rem;
  max-width: 40rem;
  margin-left: 2rem; /* 调整与左侧边缘的距离 */
  text-align: left; /* 让文字靠左对齐 */
}

.hero-en-title {
  font-family: var(--font-en-display);
  font-size: 0.875rem;
  letter-spacing: 0.25rem;
  color: var(--accent-gold);
  margin-bottom: 1.5rem;
}

.hero-main-title {
  font-family: var(--font-zh-serif);
  font-size: 4.5rem; /* 72px */
  font-weight: 500;
  letter-spacing: 0.5rem;
  color: #fff;
  margin-bottom: 2rem;
  line-height: 1.2;
  text-shadow: 0 4px 20px rgba(0,0,0,0.6); /* 增加文字阴影保证在复杂背景下的可读性 */
}

.hero-divider {
  width: 3rem;
  height: 2px;
  background-color: var(--accent-gold);
  margin: 0 auto 2rem 0; /* 左对齐分隔线 */
}

.hero-subtitle {
  font-family: var(--font-zh-sans);
  font-size: 1.25rem;
  letter-spacing: 0.5rem;
  color: rgba(255, 255, 255, 0.9);
  margin-bottom: 2.5rem;
  text-shadow: 0 2px 10px rgba(0,0,0,0.5);
}

.hero-desc {
  font-family: var(--font-zh-serif);
  font-size: 1.125rem;
  line-height: 2;
  color: rgba(255, 255, 255, 0.8);
  letter-spacing: 0.125rem;
  text-shadow: 0 2px 10px rgba(0,0,0,0.5);
}

/* 2. Vision Section */
.vision-section {
  padding: var(--section-padding);
}

.vision-section .lead-text {
  font-family: var(--font-zh-serif);
  font-size: 1.5rem; /* 24px */
  color: var(--text-primary);
  margin-bottom: 2rem; /* 32px */
  line-height: 2;
}

.vision-section .sub-text {
  font-size: 1rem; /* 16px */
  color: var(--text-secondary);
  max-width: 50rem; /* 800px */
  margin: 0 auto;
}

/* 3. Grand Architecture */
.grand-section {
  position: relative;
  overflow: hidden;
}

.grand-section .full-img {
  width: 100%;
  height: 70vh;
  object-fit: cover;
  filter: grayscale(40%) contrast(1.1);
  transform-origin: center center;
  animation: slowZoom 20s infinite alternate ease-in-out;
}

@keyframes slowZoom {
  0% { transform: scale(1); }
  100% { transform: scale(1.1); }
}

.grand-caption {
  padding: 3.75rem 1.5rem; /* 60px 24px */
  text-align: center;
}

.grand-caption p {
  font-family: var(--font-zh-serif);
  font-size: 1.5rem; /* 24px */
  letter-spacing: 0.25rem; /* 4px */
  margin-bottom: 2.5rem; /* 40px */
}

.sutra-tags {
  display: flex;
  justify-content: center;
  gap: 2.5rem; /* 40px */
  flex-wrap: wrap;
}

.sutra-tags span {
  font-family: var(--font-zh-serif);
  font-size: 0.875rem; /* 14px */
  color: var(--text-secondary);
  border: 1px solid rgba(28, 26, 25, 0.15);
  padding: 0.5rem 1.5rem; /* 8px 24px */
  border-radius: 0.25rem; /* 4px */
  letter-spacing: 0.125rem; /* 2px */
  transition: all 0.3s ease;
}

.sutra-tags span:hover {
  border-color: var(--text-primary);
  color: var(--text-primary);
}

/* 4. Comparison Section */
.comparison-section {
  padding: var(--section-padding);
  background-color: var(--bg-secondary);
}

.comparison-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2.5rem; /* 40px */
  margin-top: 3.75rem; /* 60px */
}

.compare-card {
  padding: 3.75rem; /* 60px */
  border-radius: 0.5rem; /* 8px */
  transition: transform 0.4s ease;
}

.compare-card:hover {
  transform: translateY(-5px);
}

.compare-card.traditional {
  background-color: var(--bg-secondary);
}

.compare-card.modern {
  background-color: #fff;
  box-shadow: 0 1.25rem 2.5rem rgba(0,0,0,0.03); /* 20px 40px */
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 2.5rem; /* 40px */
  padding-bottom: 1.25rem; /* 20px */
  border-bottom: 1px solid rgba(28, 26, 25, 0.1);
}

.card-header h3 {
  font-size: 1.5rem; /* 24px */
}

.status-icon {
  font-family: var(--font-en-display);
  font-size: 1.5rem; /* 24px */
  width: 2.5rem; /* 40px */
  height: 2.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
}

.status-icon.cross {
  color: #a0a0a0;
  background: rgba(0, 0, 0, 0.05);
}

.status-icon.check {
  color: var(--bg-primary);
  background: var(--text-primary);
}

.compare-list {
  list-style: none;
}

.compare-list li {
  margin-bottom: 1.25rem; /* 20px */
  color: var(--text-secondary);
  position: relative;
  padding-left: 1.25rem; /* 20px */
  font-size: 0.9375rem; /* 15px */
}

.compare-list li::before {
  content: "—";
  position: absolute;
  left: 0;
  color: var(--text-primary);
}

/* 5. Map & Environment (Eco Features) */
.eco-section {
  padding: var(--section-padding);
}

.eco-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 5rem;
  align-items: center;
}

.eco-list {
  list-style: none;
  margin-top: 2.5rem;
}

.eco-list li {
  margin-bottom: 1.5rem;
  font-family: var(--font-zh-serif);
  font-size: 1.125rem;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.eco-list li span {
  font-family: var(--font-en-display);
  font-size: 1.5rem;
  color: var(--accent-gold);
  font-weight: 300;
}

.eco-img-wrapper {
  position: relative;
  border-radius: 0.5rem;
  overflow: hidden;
  box-shadow: 0 2rem 4rem rgba(0,0,0,0.08);
}

/* 5.1 Certifications */
.cert-section {
  padding: var(--section-padding);
  background-color: #1a1817;
  color: #fff;
  background-image: url("data:image/svg+xml,%3Csvg width='100' height='100' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.8' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100' height='100' filter='url(%23noise)' opacity='0.05'/%3E%3C/svg%3E");
}

.cert-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 4rem;
  margin-top: 4rem;
}

.cert-item {
  padding: 3rem 2rem;
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: 0.5rem;
  transition: all 0.4s ease;
  background: rgba(255,255,255,0.02);
}

.cert-item:hover {
  transform: translateY(-10px);
  border-color: var(--accent-gold);
  background: rgba(255,255,255,0.05);
  box-shadow: 0 1rem 2rem rgba(0,0,0,0.2);
}

.cert-num {
  font-family: var(--font-en-display);
  font-size: 4rem;
  color: var(--accent-gold);
  font-weight: 300;
  margin-bottom: 1rem;
  line-height: 1;
}

.cert-num span {
  font-size: 1.5rem;
  font-family: var(--font-zh-serif);
  margin-left: 0.5rem;
}

.cert-item p {
  font-family: var(--font-zh-serif);
  font-size: 1.125rem;
  color: rgba(255,255,255,0.8);
  letter-spacing: 0.125rem;
}

/* 6. Digital Section */
.digital-section {
  padding: var(--section-padding);
}

.digital-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 5rem; /* 80px */
  align-items: center;
}

.digital-text p {
  font-size: 1rem; /* 16px */
  color: var(--text-secondary);
  margin-bottom: 2.5rem; /* 40px */
}

.action-link {
  display: inline-flex;
  align-items: center;
  color: var(--text-primary);
  font-family: var(--font-en-display);
  font-size: 1rem; /* 16px */
  letter-spacing: 0.125rem; /* 2px */
  font-weight: 600;
  text-transform: uppercase;
  border-bottom: 1px solid var(--text-primary);
  padding-bottom: 0.25rem;
}

.action-link .arrow {
  margin-left: 0.5rem; /* 8px */
  transition: transform 0.3s ease;
}

.action-link:hover .arrow {
  transform: translateX(8px);
}

.digital-img img {
  border-radius: 0.5rem; /* 8px */
  box-shadow: 0 1.875rem 3.75rem rgba(0,0,0,0.08); /* 30px 60px */
  filter: grayscale(50%);
  transition: filter 0.5s ease;
}

.digital-img img:hover {
  filter: grayscale(0%);
}

/* 7. Collection Section - Redesigned Interactive Gallery */
.collection-section {
  padding: var(--section-padding);
  background-color: var(--bg-secondary);
}

.section-header {
  margin-bottom: 4rem;
}

.collection-desc {
  color: var(--text-secondary);
  letter-spacing: 0.125rem;
}

.interactive-gallery {
  display: grid;
  grid-template-columns: 3fr 2fr;
  gap: 4rem;
  background: #fff;
  padding: 4rem;
  border-radius: 1rem;
  box-shadow: 0 2rem 4rem rgba(0,0,0,0.04);
}

.gallery-main {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  position: relative;
}

.gallery-image-container {
  width: 100%;
  height: 35rem; /* ~560px */
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 2rem;
  position: relative;
}

.gallery-image-container img {
  max-height: 100%;
  object-fit: contain;
  filter: drop-shadow(0 20px 30px rgba(0,0,0,0.15));
}

.fade-transition {
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.fade-out {
  opacity: 0;
  transform: translateY(10px) scale(0.98);
}

.gallery-info {
  text-align: center;
}

.gallery-info h3 {
  font-size: 2rem;
  margin-bottom: 1rem;
  letter-spacing: 0.1rem;
}

.gallery-info p {
  color: var(--text-secondary);
  font-size: 1.1rem;
}

.gallery-nav {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 1.5rem;
  border-left: 1px solid rgba(0,0,0,0.08);
  padding-left: 3rem;
}

.gallery-tab {
  background: none;
  border: none;
  text-align: left;
  padding: 1rem 0;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 1.5rem;
  color: var(--text-secondary);
  position: relative;
  transition: all 0.3s ease;
}

.gallery-tab::before {
  content: '';
  position: absolute;
  left: -3rem;
  top: 50%;
  width: 0;
  height: 2px;
  background: var(--text-primary);
  transition: width 0.3s ease;
  transform: translateY(-50%);
}

.gallery-tab:hover {
  color: var(--text-primary);
}

.gallery-tab.active {
  color: var(--text-primary);
}

.gallery-tab.active::before {
  width: 2rem;
}

.tab-number {
  font-family: var(--font-en-display);
  font-size: 1.25rem;
  font-weight: 300;
  opacity: 0.5;
  transition: opacity 0.3s ease;
}

.gallery-tab.active .tab-number {
  opacity: 1;
  font-weight: 500;
}

.tab-name {
  font-family: var(--font-zh-serif);
  font-size: 1.25rem;
  letter-spacing: 0.1rem;
}

.gallery-tab.active .tab-name {
  font-size: 1.5rem;
  font-weight: 600;
}

/* 8. Craftsmanship */
.craft-section {
  /* 移除全局 padding，改为每个 block 内部控制 */
}

.craft-block {
  padding: var(--section-padding);
}

.craft-block.dark-bg {
  background-color: #1a1817;
  color: #fff;
}

.craft-block.dark-bg .section-title,
.craft-block.dark-bg .craft-desc {
  color: #fff;
}

.craft-block.dark-bg .divider {
  background-color: var(--accent-gold);
}

.craft-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 5rem; /* 80px */
  align-items: center;
}

.craft-grid.reverse {
  direction: rtl; /* 使左右布局反转 */
}

.craft-grid.reverse > * {
  direction: ltr; /* 恢复内部文字方向 */
}

.craft-img img {
  border-radius: 0.5rem; /* 8px */
  box-shadow: 0 2rem 4rem rgba(0,0,0,0.1);
}

.craft-block.dark-bg .craft-img img {
  box-shadow: 0 2rem 4rem rgba(0,0,0,0.4);
}

.craft-text .quote {
  font-family: var(--font-zh-serif);
  font-size: 1.25rem; /* 20px */
  color: var(--accent-gold);
  margin-bottom: 1.5rem; /* 24px */
  font-style: italic;
  border-left: 2px solid var(--accent-gold);
  padding-left: 1.5rem;
}

.craft-desc {
  color: var(--text-secondary);
  font-family: var(--font-zh-serif);
  font-size: 1.125rem;
  line-height: 2;
  letter-spacing: 0.125rem;
}

/* Footer */
.site-footer {
  background-color: #111111;
  color: #fff;
  padding: 5rem 0 2.5rem; /* 80px 0 40px */
}

.footer-content {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 3.75rem; /* 60px */
  margin-bottom: 3.75rem; /* 60px */
}

.footer-brand h3 {
  font-family: var(--font-zh-serif);
  color: #fff;
  font-size: 1.5rem; /* 24px */
  margin-bottom: 1rem; /* 16px */
  letter-spacing: 0.25rem; /* 4px */
}

.footer-brand p {
  color: rgba(255, 255, 255, 0.5);
  letter-spacing: 0.125rem; /* 2px */
  font-family: var(--font-zh-serif);
}

.footer-links {
  display: flex;
  gap: 5rem; /* 80px */
}

.link-group h4 {
  font-family: var(--font-en-display);
  text-transform: uppercase;
  color: #fff;
  font-size: 1rem; /* 16px */
  margin-bottom: 1.5rem; /* 24px */
  letter-spacing: 0.125rem; /* 2px */
}

.link-group a,
.link-group p {
  display: block;
  color: rgba(255, 255, 255, 0.6);
  margin-bottom: 0.75rem; /* 12px */
  font-size: 0.875rem; /* 14px */
}

.link-group a:hover {
  color: #fff;
  transform: translateX(4px);
}

.footer-bottom {
  text-align: center;
  padding-top: 2.5rem; /* 40px */
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  color: rgba(255, 255, 255, 0.4);
  font-size: 0.75rem; /* 12px */
  font-family: var(--font-en-display);
}

/* Responsive */
@media (max-width: 1024px) {
  html {
    font-size: 14px; /* Scale down rem values */
  }

  .comparison-grid,
  .digital-grid,
  .craft-grid,
  .footer-content,
  .eco-grid {
    grid-template-columns: 1fr;
    gap: 2.5rem; /* 40px */
  }

  .cert-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  
  .interactive-gallery {
    grid-template-columns: 1fr;
    gap: 2rem;
    padding: 2rem;
  }

  .gallery-nav {
    border-left: none;
    border-top: 1px solid rgba(0,0,0,0.08);
    padding-left: 0;
    padding-top: 2rem;
    flex-direction: row;
    flex-wrap: wrap;
    justify-content: center;
  }

  .gallery-tab::before {
    display: none;
  }

  .gallery-tab {
    flex-direction: column;
    gap: 0.5rem;
    text-align: center;
    padding: 0.5rem 1rem;
  }

  .gallery-image-container {
    height: 25rem;
  }
}

@media (max-width: 768px) {
  html {
    font-size: 12px;
  }

  .site-header {
    padding: 1rem 1.5rem;
  }
  
  .site-nav {
    display: none; /* Mobile menu needed in real impl */
  }
  
  .vertical-title h1 {
    font-size: 3rem;
  }
  
  .footer-links {
    flex-direction: column;
    gap: 2.5rem;
  }
}