/* ==================== CSS变量定义 ==================== */
:root {
  --color-dark-gray: #2C2C2C;
  --color-light-gray: #F8F8F8;
  --color-off-white: #FAF9F6;
  --color-black: #000000;
  --color-accent: #C5A572;
  --color-white: #FFFFFF;
  
  --font-chinese: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-english: "Helvetica Neue", Helvetica, Arial, sans-serif;
  
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 2rem;
  --spacing-lg: 4rem;
  --spacing-xl: 6rem;
  
  --transition-fast: 300ms ease;
  --transition-medium: 500ms ease;
  
  --shadow-subtle: 0 4px 20px rgba(0, 0, 0, 0.08);
  --shadow-medium: 0 8px 40px rgba(0, 0, 0, 0.12);
}

/* ==================== 全局重置 ==================== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

body {
  font-family: var(--font-chinese), var(--font-english);
  font-weight: 400;
  line-height: 1.8;
  color: var(--color-dark-gray);
  background-color: var(--color-off-white);
  overflow-x: hidden;
}

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

a {
  text-decoration: none;
  color: inherit;
  transition: opacity var(--transition-fast);
}

a:hover {
  opacity: 0.7;
}

/* ==================== 导航栏 ==================== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background-color: rgba(250, 249, 246, 0.95);
  backdrop-filter: blur(10px);
  padding: var(--spacing-sm) var(--spacing-md);
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid rgba(44, 44, 44, 0.1);
}

.navbar-logo {
  font-size: 1.5rem;
  font-weight: 300;
  letter-spacing: 2px;
  color: var(--color-black);
}

.navbar-menu {
  display: flex;
  gap: var(--spacing-md);
  list-style: none;
}

.navbar-menu a {
  font-size: 0.95rem;
  font-weight: 300;
  letter-spacing: 1px;
  position: relative;
}

.navbar-menu a.active::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  right: 0;
  height: 1px;
  background-color: var(--color-accent);
}

.navbar-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--color-black);
}

/* ==================== 页脚 ==================== */
.footer {
  padding: var(--spacing-lg) var(--spacing-md);
  text-align: center;
  border-top: 1px solid rgba(44, 44, 44, 0.1);
  margin-top: var(--spacing-xl);
}

.footer-text {
  font-size: 0.9rem;
  font-weight: 300;
  color: var(--color-dark-gray);
  letter-spacing: 1px;
}

/* ==================== 首页 - 轮播图 ==================== */
.hero-slider {
  position: relative;
  height: 100vh;
  overflow: hidden;
  margin-top: 60px;
}

.slide {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  transition: opacity 1s ease;
}

.slide.active {
  opacity: 1;
}

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

.slide-caption {
  position: absolute;
  bottom: var(--spacing-xl);
  left: 50%;
  transform: translateX(-50%);
  text-align: center;
  color: var(--color-white);
  font-size: 2rem;
  font-weight: 300;
  letter-spacing: 3px;
  text-shadow: 0 2px 20px rgba(0, 0, 0, 0.5);
}

/* ==================== 首页 - 导航卡片 ==================== */
.nav-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-md);
  padding: var(--spacing-xl) var(--spacing-md);
  max-width: 1400px;
  margin: 0 auto;
}

.nav-card {
  position: relative;
  height: 400px;
  overflow: hidden;
  cursor: pointer;
  transition: transform var(--transition-medium);
}

.nav-card:hover {
  transform: scale(1.03);
}

.nav-card img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-medium);
}

.nav-card:hover img {
  transform: scale(1.1);
}

.nav-card-content {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: var(--spacing-md);
  background: linear-gradient(to top, rgba(0, 0, 0, 0.8), transparent);
  color: var(--color-white);
  text-align: center;
}

.nav-card-icon {
  font-size: 2rem;
  margin-bottom: var(--spacing-sm);
}

.nav-card-title {
  font-size: 1.2rem;
  font-weight: 300;
  letter-spacing: 2px;
}

/* ==================== 系列展示页面 ==================== */
.collections-page {
  padding: calc(60px + var(--spacing-xl)) var(--spacing-md) var(--spacing-xl);
  max-width: 1400px;
  margin: 0 auto;
}

.page-title {
  text-align: center;
  font-size: 2.5rem;
  font-weight: 300;
  letter-spacing: 4px;
  margin-bottom: var(--spacing-xl);
  color: var(--color-black);
}

.collection-section {
  margin-bottom: calc(var(--spacing-xl) * 1.5);
}

.collection-title {
  font-size: 1.8rem;
  font-weight: 300;
  letter-spacing: 3px;
  margin-bottom: var(--spacing-sm);
  color: var(--color-black);
}

.collection-description {
  font-size: 1rem;
  font-weight: 300;
  line-height: 1.8;
  color: var(--color-dark-gray);
  margin-bottom: var(--spacing-md);
  max-width: 800px;
}

.collection-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-md);
}

.collection-item {
  position: relative;
  overflow: hidden;
  cursor: pointer;
  aspect-ratio: 3 / 4;
}

.collection-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-medium);
}

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

/* ==================== 风格指南页面 ==================== */
.style-guide-page {
  padding: calc(60px + var(--spacing-xl)) var(--spacing-md) var(--spacing-xl);
  max-width: 900px;
  margin: 0 auto;
}

.chapter {
  margin-bottom: calc(var(--spacing-xl) * 1.5);
}

.chapter-title {
  font-size: 1.8rem;
  font-weight: 300;
  letter-spacing: 3px;
  margin-bottom: var(--spacing-md);
  color: var(--color-black);
}

.chapter-subtitle {
  font-size: 1.2rem;
  font-weight: 300;
  letter-spacing: 2px;
  margin: var(--spacing-md) 0 var(--spacing-sm);
  color: var(--color-accent);
}

.chapter-image {
  width: 100%;
  margin: var(--spacing-md) 0;
  box-shadow: var(--shadow-subtle);
}

.chapter-content {
  font-size: 1.05rem;
  font-weight: 300;
  line-height: 2;
  color: var(--color-dark-gray);
  text-align: justify;
}

/* ==================== 返回链接 ==================== */
.back-link {
  display: inline-block;
  margin-top: var(--spacing-xl);
  padding: var(--spacing-sm) var(--spacing-md);
  border: 1px solid var(--color-dark-gray);
  font-size: 0.95rem;
  font-weight: 300;
  letter-spacing: 1px;
  transition: all var(--transition-fast);
}

.back-link:hover {
  background-color: var(--color-dark-gray);
  color: var(--color-white);
  opacity: 1;
}

/* ==================== 图片放大模态框 ==================== */
.modal {
  display: none;
  position: fixed;
  z-index: 2000;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.95);
  animation: fadeIn var(--transition-fast);
}

.modal.show {
  display: flex;
  justify-content: center;
  align-items: center;
}

.modal-content {
  max-width: 90%;
  max-height: 90%;
  object-fit: contain;
  animation: scaleIn var(--transition-medium);
}

.modal-close {
  position: absolute;
  top: var(--spacing-md);
  right: var(--spacing-md);
  font-size: 2.5rem;
  color: var(--color-white);
  cursor: pointer;
  background: none;
  border: none;
  transition: opacity var(--transition-fast);
}

.modal-close:hover {
  opacity: 0.7;
}

/* ==================== 动画 ==================== */
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes scaleIn {
  from {
    opacity: 0;
    transform: scale(0.9);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

.fade-in {
  opacity: 0;
  animation: fadeIn var(--transition-medium) forwards;
}

/* ==================== 响应式设计 ==================== */
@media (max-width: 1199px) {
  .nav-cards {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .collection-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 767px) {
  :root {
    --spacing-md: 1.5rem;
    --spacing-lg: 3rem;
    --spacing-xl: 4rem;
  }
  
  .navbar {
    padding: var(--spacing-sm);
  }
  
  .navbar-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background-color: var(--color-off-white);
    flex-direction: column;
    padding: var(--spacing-md);
    gap: var(--spacing-sm);
    border-bottom: 1px solid rgba(44, 44, 44, 0.1);
  }
  
  .navbar-menu.active {
    display: flex;
  }
  
  .navbar-toggle {
    display: block;
  }
  
  .slide-caption {
    font-size: 1.2rem;
    bottom: var(--spacing-md);
  }
  
  .nav-cards {
    grid-template-columns: 1fr;
    gap: var(--spacing-sm);
  }
  
  .nav-card {
    height: 300px;
  }
  
  .page-title {
    font-size: 1.8rem;
  }
  
  .collection-title,
  .chapter-title {
    font-size: 1.4rem;
  }
  
  .collection-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-sm);
  }
  
  .chapter-content {
    font-size: 1rem;
  }
}