/* ═══════════════════════════════════════════════
   Style — 侘寂·猫隧道 · Wabi-sabi Cat Tunnel
   北欧侘寂风 · 大地色系
   ═══════════════════════════════════════════════ */

/* ── 设计令牌 ── */
:root {
  --clay:       #C86A4F;
  --sage:       #9CAF88;
  --warm-beige: #F5F0EB;
  --driftwood:  #D4C5B5;
  --dark-oak:   #5C4033;
  --charcoal:   #2C2C2C;
  --cream:      #FAF7F4;
  --stone:      #E8E2DA;
  --gold:       #D4A574;

  --font-heading: 'Playfair Display', Georgia, serif;
  --font-body:    'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

  --transition: 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  --radius: 1rem;
  --radius-lg: 2rem;
  --shadow: 0 4px 24px rgba(44,44,44,0.08);
  --shadow-lg: 0 8px 40px rgba(44,44,44,0.12);
  --max-width: 1280px;
}

/* ── 基础 ── */
body {
  font-family: var(--font-body);
  background: var(--cream);
  color: var(--charcoal);
}

.container {
  width: 92%;
  max-width: var(--max-width);
  margin: 0 auto;
}

.section-label {
  font-family: var(--font-heading);
  font-size: 0.75rem;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--clay);
  margin-bottom: 0.75rem;
}

.section-title {
  font-family: var(--font-heading);
  font-size: clamp(2rem, 5vw, 3.2rem);
  color: var(--dark-oak);
  line-height: 1.15;
  margin-bottom: 1rem;
}

.section-desc {
  font-size: 1.05rem;
  color: var(--dark-oak);
  opacity: 0.7;
  max-width: 560px;
  line-height: 1.7;
}

/* ── 导航 ── */
nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 1.25rem 4%;
  background: rgba(250,247,244,0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: var(--transition);
}

nav.scrolled {
  box-shadow: 0 1px 0 rgba(44,44,44,0.06);
}

.nav-logo {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  color: var(--dark-oak);
  letter-spacing: -0.02em;
}

.nav-logo span {
  color: var(--clay);
}

.nav-links {
  display: flex;
  gap: 2.5rem;
  align-items: center;
}

.nav-links a {
  font-size: 0.85rem;
  letter-spacing: 0.05em;
  color: var(--charcoal);
  opacity: 0.7;
  transition: var(--transition);
  position: relative;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--clay);
  transition: var(--transition);
}

.nav-links a:hover {
  opacity: 1;
}

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

.cart-btn {
  position: relative;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--warm-beige);
  transition: var(--transition);
}

.cart-btn:hover {
  background: var(--driftwood);
}

.cart-count {
  position: absolute;
  top: -2px;
  right: -2px;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--clay);
  color: #fff;
  font-size: 0.7rem;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  opacity: 0;
  transform: scale(0);
  transition: var(--transition);
}

.cart-count.show {
  opacity: 1;
  transform: scale(1);
}

.mobile-menu-btn {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
}

.mobile-menu-btn span {
  display: block;
  width: 24px;
  height: 1.5px;
  background: var(--charcoal);
  transition: var(--transition);
}

/* ── Hero ── */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  background: var(--dark-oak);
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero-bg video,
.hero-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.5;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(44,44,44,0.6) 0%, rgba(92,64,51,0.4) 100%);
  z-index: 1;
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  max-width: 800px;
  padding: 0 5%;
}

.hero-content h1 {
  font-family: var(--font-heading);
  font-size: clamp(3rem, 8vw, 5.5rem);
  color: var(--cream);
  line-height: 1.05;
  letter-spacing: -0.02em;
  margin-bottom: 1.5rem;
}

.hero-content h1 em {
  font-style: normal;
  color: var(--gold);
}

.hero-content p {
  font-size: clamp(1rem, 2vw, 1.2rem);
  color: rgba(250,247,244,0.75);
  max-width: 520px;
  margin: 0 auto 2.5rem;
  line-height: 1.8;
  letter-spacing: 0.02em;
}

.hero-cta {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  padding: 1rem 2.5rem;
  background: var(--clay);
  color: var(--cream);
  border-radius: 50px;
  font-size: 0.9rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  transition: var(--transition);
}

.hero-cta:hover {
  background: var(--gold);
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(200,106,79,0.3);
}

.hero-scroll {
  position: absolute;
  bottom: 2.5rem;
  left: 50%;
  transform: translateX(-50%);
  z-index: 2;
  color: rgba(250,247,244,0.5);
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
}

.hero-scroll .line {
  width: 1px;
  height: 40px;
  background: linear-gradient(to bottom, rgba(250,247,244,0.5), transparent);
}

/* ── 哲学区块 ── */
.philosophy {
  padding: 8rem 0;
  background: var(--cream);
}

.philosophy-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
}

.philosophy-image {
  position: relative;
  aspect-ratio: 3/4;
  background: var(--warm-beige);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

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

.philosophy-image::before {
  content: '';
  position: absolute;
  top: -20px;
  left: -20px;
  right: 20px;
  bottom: 20px;
  border: 1px solid var(--driftwood);
  border-radius: var(--radius-lg);
  z-index: 0;
}

.philosophy-text {
  padding-right: 2rem;
}

.philosophy-text .section-desc {
  font-size: 1.1rem;
  line-height: 1.9;
  opacity: 0.75;
}

.philosophy-text .signature {
  margin-top: 2rem;
  font-family: var(--font-heading);
  font-size: 1.1rem;
  color: var(--dark-oak);
  font-style: italic;
}

/* ── 模块系统 ── */
.modules {
  padding: 8rem 0;
  background: var(--warm-beige);
}

.modules-header {
  text-align: center;
  margin-bottom: 4rem;
}

.modules-header .section-desc {
  margin: 0 auto;
}

.modules-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
}

.module-card {
  background: var(--cream);
  border-radius: var(--radius);
  padding: 2.5rem 1.5rem;
  text-align: center;
  transition: var(--transition);
  cursor: pointer;
  position: relative;
  overflow: hidden;
}

.module-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--clay);
  transform: scaleX(0);
  transform-origin: left;
  transition: var(--transition);
}

.module-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
}

.module-card:hover::before {
  transform: scaleX(1);
}

.module-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 1.25rem;
  border-radius: 50%;
  background: var(--warm-beige);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
}

.module-card h3 {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  color: var(--dark-oak);
  margin-bottom: 0.5rem;
}

.module-card p {
  font-size: 0.85rem;
  color: var(--charcoal);
  opacity: 0.6;
  line-height: 1.6;
}

/* ── 3D 配置器 ── */
.configurator {
  padding: 8rem 0;
  background: var(--cream);
  position: relative;
}

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

.configurator-canvas-wrap {
  position: relative;
  width: 100%;
  height: 520px;
  background: var(--warm-beige);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow);
}

#configurator-canvas {
  width: 100%;
  height: 100%;
  display: block;
}

.configurator-controls {
  display: flex;
  justify-content: center;
  gap: 0.75rem;
  margin-top: 1.5rem;
  flex-wrap: wrap;
}

.config-btn {
  padding: 0.6rem 1.4rem;
  border-radius: 50px;
  background: var(--cream);
  border: 1px solid var(--driftwood);
  font-size: 0.8rem;
  letter-spacing: 0.04em;
  color: var(--dark-oak);
  transition: var(--transition);
}

.config-btn:hover,
.config-btn.active {
  background: var(--dark-oak);
  color: var(--cream);
  border-color: var(--dark-oak);
}

.config-hint {
  text-align: center;
  margin-top: 1rem;
  font-size: 0.8rem;
  color: var(--charcoal);
  opacity: 0.5;
  letter-spacing: 0.04em;
}

/* ── 产品系列 ── */
.products {
  padding: 8rem 0;
  background: var(--warm-beige);
}

.products-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  margin-bottom: 3rem;
  flex-wrap: wrap;
  gap: 1.5rem;
}

.products-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.product-card {
  background: var(--cream);
  border-radius: var(--radius);
  overflow: hidden;
  transition: var(--transition);
  cursor: pointer;
}

.product-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.product-image {
  aspect-ratio: 4/3;
  background: var(--stone);
  position: relative;
  overflow: hidden;
}

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

.product-card:hover .product-image img {
  transform: scale(1.05);
}

.product-badge {
  position: absolute;
  top: 1rem;
  left: 1rem;
  padding: 0.3rem 0.8rem;
  border-radius: 50px;
  background: var(--clay);
  color: #fff;
  font-size: 0.7rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.product-info {
  padding: 1.5rem;
}

.product-category {
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--sage);
  margin-bottom: 0.4rem;
}

.product-info h3 {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  color: var(--dark-oak);
  margin-bottom: 0.3rem;
}

.product-material {
  font-size: 0.8rem;
  color: var(--charcoal);
  opacity: 0.5;
  margin-bottom: 0.75rem;
}

.product-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.product-price {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  color: var(--dark-oak);
}

.add-to-cart {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--warm-beige);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
  font-size: 1.1rem;
}

.add-to-cart:hover {
  background: var(--dark-oak);
  color: var(--cream);
}

/* ── 评价 ── */
.reviews {
  padding: 8rem 0;
  background: var(--cream);
}

.reviews-header {
  text-align: center;
  margin-bottom: 4rem;
}

.reviews-track {
  display: flex;
  gap: 2rem;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
  padding-bottom: 1rem;
  scrollbar-width: none;
}

.reviews-track::-webkit-scrollbar {
  display: none;
}

.review-card {
  flex: 0 0 380px;
  scroll-snap-align: start;
  background: var(--warm-beige);
  border-radius: var(--radius);
  padding: 2.5rem 2rem;
  transition: var(--transition);
}

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

.review-stars {
  color: var(--gold);
  font-size: 0.9rem;
  margin-bottom: 1.25rem;
  letter-spacing: 0.15em;
}

.review-text {
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--charcoal);
  opacity: 0.75;
  margin-bottom: 1.5rem;
  font-style: italic;
}

.review-author {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.review-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--driftwood);
  overflow: hidden;
}

.review-name {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--dark-oak);
}

.review-title {
  font-size: 0.75rem;
  color: var(--charcoal);
  opacity: 0.5;
}

/* ── 底部 ── */
footer {
  padding: 5rem 0 2rem;
  background: var(--dark-oak);
  color: rgba(250,247,244,0.7);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 3rem;
  margin-bottom: 3rem;
}

.footer-brand h3 {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  color: var(--cream);
  margin-bottom: 0.75rem;
}

.footer-brand h3 span {
  color: var(--gold);
}

.footer-brand p {
  font-size: 0.85rem;
  line-height: 1.8;
  max-width: 280px;
}

.footer-col h4 {
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--cream);
  margin-bottom: 1.25rem;
}

.footer-col a {
  display: block;
  font-size: 0.85rem;
  padding: 0.3rem 0;
  transition: var(--transition);
}

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

.footer-bottom {
  padding-top: 2rem;
  border-top: 1px solid rgba(250,247,244,0.08);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  font-size: 0.78rem;
}

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

.footer-social a {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: 1px solid rgba(250,247,244,0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
  font-size: 0.9rem;
}

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

/* ── 购物车侧栏 ── */
.cart-overlay {
  position: fixed;
  inset: 0;
  z-index: 200;
  background: rgba(44,44,44,0.3);
  opacity: 0;
  pointer-events: none;
  transition: var(--transition);
  backdrop-filter: blur(2px);
}

.cart-overlay.open {
  opacity: 1;
  pointer-events: all;
}

.cart-sidebar {
  position: fixed;
  top: 0;
  right: -420px;
  width: 400px;
  max-width: 90vw;
  height: 100vh;
  z-index: 201;
  background: var(--cream);
  padding: 2rem;
  transition: right 0.5s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  display: flex;
  flex-direction: column;
  box-shadow: -4px 0 40px rgba(44,44,44,0.1);
}

.cart-sidebar.open {
  right: 0;
}

.cart-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 2rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--stone);
}

.cart-header h3 {
  font-family: var(--font-heading);
  font-size: 1.3rem;
  color: var(--dark-oak);
}

.cart-close {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--warm-beige);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}

.cart-close:hover {
  background: var(--driftwood);
}

.cart-items {
  flex: 1;
  overflow-y: auto;
}

.cart-empty {
  text-align: center;
  padding: 3rem 0;
  color: var(--charcoal);
  opacity: 0.4;
  font-size: 0.9rem;
}

.cart-item {
  display: flex;
  gap: 1rem;
  padding: 1rem 0;
  border-bottom: 1px solid var(--stone);
}

.cart-item-img {
  width: 64px;
  height: 64px;
  border-radius: 8px;
  background: var(--warm-beige);
  flex-shrink: 0;
  overflow: hidden;
}

.cart-item-info {
  flex: 1;
}

.cart-item-info h4 {
  font-size: 0.9rem;
  color: var(--dark-oak);
  margin-bottom: 0.2rem;
}

.cart-item-info .cart-item-price {
  font-size: 0.85rem;
  color: var(--clay);
}

.cart-item-qty {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: 0.4rem;
}

.cart-item-qty button {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--warm-beige);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8rem;
  transition: var(--transition);
}

.cart-item-qty button:hover {
  background: var(--driftwood);
}

.cart-item-qty span {
  font-size: 0.85rem;
  min-width: 20px;
  text-align: center;
}

.cart-item-remove {
  font-size: 0.7rem;
  color: var(--charcoal);
  opacity: 0.3;
  transition: var(--transition);
  cursor: pointer;
  align-self: flex-start;
  padding: 0.25rem;
}

.cart-item-remove:hover {
  opacity: 0.8;
  color: var(--clay);
}

.cart-footer {
  padding-top: 1.5rem;
  border-top: 1px solid var(--stone);
}

.cart-total {
  display: flex;
  justify-content: space-between;
  font-size: 1.05rem;
  color: var(--dark-oak);
  margin-bottom: 1rem;
  font-family: var(--font-heading);
}

.cart-checkout {
  width: 100%;
  padding: 1rem;
  background: var(--dark-oak);
  color: var(--cream);
  border-radius: 50px;
  font-size: 0.85rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  transition: var(--transition);
}

.cart-checkout:hover {
  background: var(--clay);
}

/* ── 动画类 ── */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

.fade-in-left {
  opacity: 0;
  transform: translateX(-40px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

.fade-in-left.visible {
  opacity: 1;
  transform: translateX(0);
}

.fade-in-right {
  opacity: 0;
  transform: translateX(40px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

.fade-in-right.visible {
  opacity: 1;
  transform: translateX(0);
}

/* ── 响应式 ── */
@media (max-width: 1024px) {
  .philosophy-grid {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }
  .philosophy-text {
    padding-right: 0;
  }
  .modules-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .products-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
  }
  .nav-links.mobile-open {
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--cream);
    justify-content: center;
    gap: 2rem;
    font-size: 1.2rem;
    z-index: 99;
  }
  .mobile-menu-btn {
    display: flex;
  }
  .modules-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .products-grid {
    grid-template-columns: 1fr;
  }
  .review-card {
    flex: 0 0 300px;
  }
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  .configurator-canvas-wrap {
    height: 360px;
  }
}

@media (max-width: 480px) {
  .modules-grid {
    grid-template-columns: 1fr;
  }
  .configurator-canvas-wrap {
    height: 280px;
  }
  .hero-content h1 {
    font-size: clamp(2rem, 10vw, 3rem);
  }
}