/* 全局样式 - 极简主义设计 */
:root {
  --color-ivory: #faf9f6;
  --color-light-gray: #e8e8e8;
  --color-sand: #d4c4b0;
  --color-mist-blue: #a8b8c8;
  --color-clay-pink: #d4a89f;
  --color-olive: #8b9a7e;
  --color-charcoal: #3a3a3a;
  --color-text: #2d2d2d;
  --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 2rem;
  --spacing-lg: 4rem;
  --spacing-xl: 6rem;
}

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

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

body {
  font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;
  color: var(--color-text);
  background-color: var(--color-ivory);
  line-height: 1.8;
  overflow-x: hidden;
}

.font-serif {
  font-family: 'Noto Serif SC', 'Playfair Display', serif;
}

.container-custom {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

/* 导航栏样式 */
.nav-header {
  position: fixed;
  top: 0;
  width: 100%;
  background-color: rgba(250, 249, 246, 0.95);
  backdrop-filter: blur(10px);
  z-index: 1000;
  transition: var(--transition-smooth);
}

.nav-header.scrolled {
  box-shadow: 0 2px 20px rgba(0, 0, 0, 0.05);
}

.nav-link {
  position: relative;
  transition: var(--transition-smooth);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 50%;
  width: 0;
  height: 1px;
  background-color: var(--color-charcoal);
  transition: var(--transition-smooth);
  transform: translateX(-50%);
}

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

/* 全屏轮播横幅 */
.hero-banner {
  position: relative;
  height: 100vh;
  overflow: hidden;
}

.hero-slide {
  position: absolute;
  width: 100%;
  height: 100%;
  opacity: 0;
  transition: opacity 1.2s ease-in-out;
}

.hero-slide.active {
  opacity: 1;
}

.hero-slide img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

.hero-overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  background: linear-gradient(to top, rgba(0, 0, 0, 0.4), transparent);
  padding: var(--spacing-lg);
}

/* 图片悬停效果 */
.image-hover {
  overflow: hidden;
  position: relative;
}

.image-hover img {
  transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
  will-change: transform;
}

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

.image-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(0, 0, 0, 0.7), transparent);
  opacity: 0;
  transition: var(--transition-smooth);
  display: flex;
  align-items: flex-end;
  padding: var(--spacing-md);
}

.image-hover:hover .image-overlay {
  opacity: 1;
}

/* 网格布局 */
.grid-masonry {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--spacing-md);
}

/* 卡片样式 */
.card-elegant {
  background: white;
  border-radius: 0;
  overflow: hidden;
  transition: var(--transition-smooth);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
}

.card-elegant:hover {
  box-shadow: 0 8px 40px rgba(0, 0, 0, 0.12);
  transform: translateY(-4px);
}

/* 按钮样式 */
.btn-minimal {
  position: relative;
  padding: var(--spacing-sm) var(--spacing-md);
  border: 1px solid var(--color-charcoal);
  background: transparent;
  color: var(--color-charcoal);
  cursor: pointer;
  transition: var(--transition-smooth);
  overflow: hidden;
}

.btn-minimal::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: var(--color-charcoal);
  transition: left 0.4s ease;
  z-index: -1;
}

.btn-minimal:hover {
  color: white;
}

.btn-minimal:hover::before {
  left: 0;
}

/* 灯箱查看 */
.lightbox {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.95);
  z-index: 9999;
  align-items: center;
  justify-content: center;
  animation: fadeIn 0.3s ease;
}

.lightbox.active {
  display: flex;
}

.lightbox-content {
  max-width: 90vw;
  max-height: 90vh;
  position: relative;
}

.lightbox-content img {
  max-width: 100%;
  max-height: 90vh;
  object-fit: contain;
}

.lightbox-close {
  position: absolute;
  top: var(--spacing-md);
  right: var(--spacing-md);
  font-size: 2.5rem;
  color: white;
  cursor: pointer;
  transition: var(--transition-smooth);
  background: none;
  border: none;
  z-index: 10000;
}

.lightbox-close:hover {
  transform: rotate(90deg);
}

/* 滚动进度指示器 */
.scroll-progress {
  position: fixed;
  top: 0;
  right: 0;
  width: 4px;
  height: 0;
  background: linear-gradient(to bottom, var(--color-mist-blue), var(--color-clay-pink));
  z-index: 999;
  transition: height 0.1s ease;
}

/* 返回顶部按钮 */
.back-to-top {
  position: fixed;
  bottom: var(--spacing-md);
  right: var(--spacing-md);
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: var(--color-charcoal);
  color: white;
  display: none;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--transition-smooth);
  z-index: 999;
  border: none;
}

.back-to-top.visible {
  display: flex;
}

.back-to-top:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.2);
}

/* 加载动画 */
.img-loading {
  background: linear-gradient(90deg, var(--color-light-gray) 25%, var(--color-sand) 50%, var(--color-light-gray) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
}

@keyframes shimmer {
  0% {
    background-position: -200% 0;
  }
  100% {
    background-position: 200% 0;
  }
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

/* 视差滚动效果 */
.parallax {
  background-attachment: fixed;
  background-position: center;
  background-repeat: no-repeat;
  background-size: cover;
}

/* 响应式设计 */
@media (max-width: 1199px) {
  .grid-masonry {
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  }
}

@media (max-width: 767px) {
  :root {
    --spacing-md: 1rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
  }

  .grid-masonry {
    grid-template-columns: 1fr;
    gap: var(--spacing-sm);
  }

  .hero-banner {
    height: 70vh;
  }

  .container-custom {
    padding: 0 var(--spacing-sm);
  }

  .back-to-top {
    width: 40px;
    height: 40px;
    bottom: var(--spacing-sm);
    right: var(--spacing-sm);
  }
}

/* 可访问性优化 */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

*:focus {
  outline: 2px solid var(--color-mist-blue);
  outline-offset: 2px;
}

/* 面料样本交互 */
.fabric-sample {
  cursor: pointer;
  transition: var(--transition-smooth);
}

.fabric-sample:hover {
  transform: scale(1.1);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.15);
}

/* 工艺步骤可视化 */
.process-step {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.process-step.visible {
  opacity: 1;
  transform: translateY(0);
}