/* ========================================
   时尚女装展示网站 - 全局样式
   By HAISNAP
   ======================================== */

/* ========================================
   CSS变量与设计令牌
   ======================================== */
:root {
  /* 配色方案 */
  --color-primary: #f5f5f0;
  --color-secondary: #e8e4dc;
  --color-accent: #c9b896;
  --color-text-primary: #2c2c2c;
  --color-text-secondary: #6b6b6b;
  --color-background: #fafaf8;
  --color-overlay: rgba(0, 0, 0, 0.4);

  /* 字体系统 */
  --font-heading: "Helvetica Neue", "Noto Sans SC", sans-serif;
  --font-body: "Noto Serif SC", Georgia, serif;
  --font-size-xs: 0.875rem;
  --font-size-sm: 1rem;
  --font-size-md: 1.25rem;
  --font-size-lg: 1.75rem;
  --font-size-xl: 2.5rem;
  --font-size-xxl: 3.5rem;

  /* 间距系统 */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 2rem;
  --spacing-lg: 4rem;
  --spacing-xl: 6rem;
  --spacing-xxl: 8rem;

  /* 阴影与圆角 */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.12);
  --radius-sm: 2px;
  --radius-md: 4px;

  /* 过渡动画 */
  --transition-fast: 0.2s ease;
  --transition-normal: 0.4s ease;
  --transition-slow: 0.6s ease;
}

/* ========================================
   全局重置与基础样式
   ======================================== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-body);
  font-size: var(--font-size-sm);
  line-height: 1.8;
  color: var(--color-text-primary);
  background-color: var(--color-background);
  overflow-x: hidden;
}

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

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

a:hover {
  opacity: 0.7;
}

/* ========================================
   排版系统
   ======================================== */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 500;
  line-height: 1.3;
  letter-spacing: -0.02em;
  margin-bottom: var(--spacing-md);
}

h1 {
  font-size: var(--font-size-xxl);
}

h2 {
  font-size: var(--font-size-xl);
}

h3 {
  font-size: var(--font-size-lg);
}

p {
  margin-bottom: var(--spacing-sm);
  color: var(--color-text-secondary);
}

/* ========================================
   布局容器
   ======================================== */
.container {
  width: 100%;
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.section {
  padding: var(--spacing-xxl) 0;
}

.section-sm {
  padding: var(--spacing-lg) 0;
}

/* ========================================
   导航栏
   ======================================== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(250, 250, 248, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(0, 0, 0, 0.05);
  transition: transform var(--transition-normal);
}

.navbar-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-md) var(--spacing-md);
  max-width: 1400px;
  margin: 0 auto;
}

.navbar-logo {
  font-family: var(--font-heading);
  font-size: var(--font-size-md);
  font-weight: 500;
  letter-spacing: 0.05em;
}

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

.navbar-link {
  font-size: var(--font-size-xs);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  position: relative;
}

.navbar-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--color-text-primary);
  transition: width var(--transition-normal);
}

.navbar-link:hover::after,
.navbar-link.active::after {
  width: 100%;
}

/* ========================================
   轮播图
   ======================================== */
.hero-slider {
  position: relative;
  width: 100%;
  height: 100vh;
  overflow: hidden;
  margin-top: 72px;
}

.slider-item {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  transition: opacity var(--transition-slow);
}

.slider-item.active {
  opacity: 1;
}

.slider-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

.slider-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(to bottom, rgba(0,0,0,0.1), rgba(0,0,0,0.3));
  display: flex;
  align-items: flex-end;
  justify-content: center;
  padding: var(--spacing-xl);
}

.slider-caption {
  text-align: center;
  color: white;
  max-width: 800px;
}

.slider-caption h2 {
  font-size: var(--font-size-xl);
  font-weight: 400;
  letter-spacing: 0.05em;
  text-shadow: 0 2px 8px rgba(0,0,0,0.3);
  margin-bottom: var(--spacing-sm);
}

.slider-controls {
  position: absolute;
  bottom: var(--spacing-md);
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: var(--spacing-sm);
  z-index: 10;
}

.slider-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.5);
  border: none;
  cursor: pointer;
  transition: background var(--transition-fast);
}

.slider-dot.active {
  background: white;
}

/* ========================================
   编辑精选区域
   ======================================== */
.featured-section {
  background: var(--color-primary);
}

.section-header {
  text-align: center;
  margin-bottom: var(--spacing-xl);
}

.section-title {
  font-size: var(--font-size-xl);
  font-weight: 400;
  letter-spacing: 0.05em;
  margin-bottom: var(--spacing-md);
}

.section-intro {
  max-width: 800px;
  margin: 0 auto;
  line-height: 2;
  color: var(--color-text-secondary);
}

.featured-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-lg);
  margin-top: var(--spacing-xl);
}

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

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

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

.featured-overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: var(--spacing-md);
  background: linear-gradient(to top, rgba(0,0,0,0.7), transparent);
  color: white;
  transform: translateY(100%);
  transition: transform var(--transition-normal);
}

.featured-item:hover .featured-overlay {
  transform: translateY(0);
}

.featured-title {
  font-size: var(--font-size-md);
  font-weight: 400;
  margin-bottom: var(--spacing-xs);
}

.featured-description {
  font-size: var(--font-size-xs);
  line-height: 1.6;
  opacity: 0.9;
}

/* ========================================
   造型画廊 - 交错网格布局
   ======================================== */
.gallery-section {
  padding: var(--spacing-xxl) 0;
}

.gallery-category {
  margin-bottom: var(--spacing-xxl);
}

.category-title {
  font-size: var(--font-size-lg);
  text-align: center;
  margin-bottom: var(--spacing-lg);
  letter-spacing: 0.1em;
}

.gallery-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-md);
  padding: 0 var(--spacing-md);
}

.gallery-item {
  position: relative;
  overflow: hidden;
  background: var(--color-primary);
}

.gallery-item:nth-child(3n+1) {
  grid-row: span 2;
}

.gallery-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow), opacity var(--transition-normal);
}

.gallery-item:hover img {
  transform: scale(1.08);
  opacity: 0.9;
}

.gallery-caption {
  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: white;
  transform: translateY(100%);
  transition: transform var(--transition-normal);
}

.gallery-item:hover .gallery-caption {
  transform: translateY(0);
}

.gallery-text {
  font-size: var(--font-size-xs);
  line-height: 1.8;
}

/* ========================================
   设计理念页面
   ======================================== */
.concept-section {
  padding: var(--spacing-xl) 0;
}

.concept-block {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-xxl);
  align-items: center;
}

.concept-block:nth-child(even) {
  direction: rtl;
}

.concept-block:nth-child(even) > * {
  direction: ltr;
}

.concept-image {
  width: 100%;
  aspect-ratio: 4/5;
  object-fit: cover;
}

.concept-content {
  padding: var(--spacing-lg);
}

.concept-subtitle {
  font-size: var(--font-size-md);
  margin-bottom: var(--spacing-md);
  font-weight: 400;
}

.concept-text {
  line-height: 2;
  margin-bottom: var(--spacing-md);
  color: var(--color-text-secondary);
}

/* ========================================
   导航按钮组
   ======================================== */
.nav-section {
  text-align: center;
  padding: var(--spacing-xl) 0;
  background: var(--color-secondary);
}

.nav-buttons {
  display: flex;
  gap: var(--spacing-md);
  justify-content: center;
  flex-wrap: wrap;
}

.btn {
  display: inline-block;
  padding: var(--spacing-sm) var(--spacing-lg);
  font-family: var(--font-heading);
  font-size: var(--font-size-xs);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  background: transparent;
  border: 1px solid var(--color-text-primary);
  cursor: pointer;
  transition: all var(--transition-normal);
}

.btn:hover {
  background: var(--color-text-primary);
  color: var(--color-background);
  transform: translateY(-2px);
}

/* ========================================
   页脚
   ======================================== */
.footer {
  text-align: center;
  padding: var(--spacing-md);
  font-size: var(--font-size-xs);
  color: var(--color-text-secondary);
  border-top: 1px solid rgba(0, 0, 0, 0.05);
}

/* ========================================
   响应式设计
   ======================================== */
@media (max-width: 768px) {
  :root {
    --font-size-xxl: 2.5rem;
    --font-size-xl: 2rem;
    --font-size-lg: 1.5rem;
    --spacing-xxl: 4rem;
    --spacing-xl: 3rem;
    --spacing-lg: 2rem;
  }

  .navbar-menu {
    gap: var(--spacing-md);
  }

  .hero-slider {
    height: 70vh;
    margin-top: 60px;
  }

  .featured-grid {
    grid-template-columns: 1fr;
  }

  .gallery-grid {
    grid-template-columns: 1fr;
  }

  .gallery-item:nth-child(3n+1) {
    grid-row: span 1;
  }

  .concept-block {
    grid-template-columns: 1fr;
  }

  .concept-block:nth-child(even) {
    direction: ltr;
  }

  .nav-buttons {
    flex-direction: column;
    align-items: center;
  }

  .btn {
    width: 80%;
  }
}

@media (max-width: 480px) {
  .navbar-container {
    flex-direction: column;
    gap: var(--spacing-sm);
  }

  .slider-overlay {
    padding: var(--spacing-md);
  }

  .slider-caption h2 {
    font-size: var(--font-size-lg);
  }
}

/* ========================================
   懒加载占位符
   ======================================== */
.lazy-loading {
  background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
  background-size: 200% 100%;
  animation: loading 1.5s ease-in-out infinite;
}

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

/* ========================================
   辅助类
   ======================================== */
.text-center {
  text-align: center;
}

.mb-lg {
  margin-bottom: var(--spacing-lg);
}

.mt-xl {
  margin-top: var(--spacing-xl);
}

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

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