/* 
 * 全局样式文件 - 现代时尚展示网站
 * 包含响应式布局、色彩系统、字体规范及交互动效
 */

/* --- 1. 核心变量定义 --- */
:root {
  /* 品牌色彩系统 - 中性高级色调 */
  --color-bg-primary: #f9f8f6;       /* 米白背景 */
  --color-bg-secondary: #ffffff;     /* 纯白卡片背景 */
  --color-text-main: #1a1a1a;        /* 深黑正文 */
  --color-text-muted: #666666;       /* 浅灰辅助文 */
  
  --color-accent-oat: #d4cdbe;       /* 燕麦色 */
  --color-accent-pink: #d8c3c3;      /* 灰粉点缀 */
  --color-accent-blue: #a2b4ba;      /* 雾霾蓝点缀 */
  --color-border: rgba(0, 0, 0, 0.05);

  /* 字体系统 - 确保清晰易读 */
  --font-base: "Helvetica Neue", "PingFang SC", "Source Han Sans SC", "Microsoft YaHei", sans-serif;
  
  /* 布局参数 */
  --nav-height: 70px;
  --container-width: 1200px;
  --transition-smooth: all 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

/* Pico.css 极简风格覆盖 */
[data-theme="light"], :root:not([data-theme="dark"]) {
  --background-color: var(--color-bg-primary);
  --color: var(--color-text-main);
  --h1-color: #000000;
  --h2-color: #1a1a1a;
  --h3-color: #333333;
  --primary: #1a1a1a;
  --primary-hover: #4d4d4d;
  --primary-focus: rgba(26, 26, 26, 0.1);
  --primary-inverse: #ffffff;
  --border-radius: 0; /* 直角设计体现现代感 */
  --form-element-border-color: #e0e0e0;
  --card-background-color: var(--color-bg-secondary);
  --card-box-shadow: none; /* 去除阴影，追求扁平化 */
  --nav-link-spacing-vertical: 0.5rem;
  --nav-link-spacing-horizontal: 1.25rem;
}

/* --- 2. 全局基础重置 --- */
html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-base);
  font-weight: 300;
  letter-spacing: 0.02em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  background-color: var(--color-bg-primary);
}

h1, h2, h3, h4 {
  font-weight: 400;
  letter-spacing: 0.05em;
}

h1 { font-size: 2.5rem; line-height: 1.2; }
h2 { font-size: 2rem; margin-bottom: 2rem; }
h3 { font-size: 1.25rem; margin-bottom: 0.5rem; }

a {
  text-decoration: none;
  color: var(--color-text-main);
  transition: var(--transition-smooth);
}

a:hover {
  color: var(--color-accent-blue);
}

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

/* --- 3. 导航栏 (Sticky Navbar) --- */
nav.container-fluid {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: rgba(249, 248, 246, 0.96); /* 高斯模糊背景 */
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
  padding-top: 0.5rem;
  padding-bottom: 0.5rem;
  height: var(--nav-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* 品牌Logo文字 */
.brand-title {
  font-size: 1.2rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: #000;
}

/* 导航链接 */
.nav-links {
  display: flex;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-links li {
  margin-left: 1.5rem;
  padding: 0;
}

.nav-links a {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: #333;
  padding: 0.5rem;
  position: relative;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 0;
  height: 1px;
  background-color: var(--color-text-main);
  transition: width 0.3s ease, left 0.3s ease;
}

.nav-links a:hover::after {
  width: 100%;
  left: 0;
}

/* 汉堡菜单按钮 (移动端) */
.menu-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  padding: 0.5rem;
  color: var(--color-text-main);
}

/* --- 4. 页面特定组件 --- */

/* 首页轮播 (Hero Carousel) */
.hero-section {
  position: relative;
  width: 100%;
  height: 85vh; /* 占据大部分视口 */
  overflow: hidden;
  margin-bottom: 4rem;
  background-color: #f0f0f0;
}

.hero-slide {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  visibility: hidden;
  transition: opacity 1.2s ease, visibility 1.2s ease;
}

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

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

.hero-caption {
  position: absolute;
  bottom: 15%;
  left: 5%;
  max-width: 600px;
  color: #fff;
  text-shadow: 0 2px 15px rgba(0,0,0,0.4);
  z-index: 10;
}

.hero-caption h2 {
  font-size: 2.2rem;
  font-weight: 300;
  color: #fff;
  margin-bottom: 0.5rem;
}

.hero-caption p {
  font-size: 1rem;
  letter-spacing: 0.05em;
  opacity: 0.9;
}

/* 快速导航网格 (Home Quick Nav) */
.quick-nav {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
  margin: 3rem 0;
}

.nav-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 2.5rem 1rem;
  background-color: #fff;
  border: 1px solid transparent;
  transition: var(--transition-smooth);
}

.nav-card:hover {
  border-color: var(--color-accent-oat);
  transform: translateY(-5px);
  box-shadow: 0 10px 30px rgba(0,0,0,0.03);
}

.nav-card-icon {
  font-size: 1.5rem;
  margin-bottom: 1rem;
  color: var(--color-text-muted);
}

.nav-card-text {
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.2em;
}

/* 服装卡片 (Collection & Items) */
.grid-gallery {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 2.5rem;
  margin-bottom: 4rem;
}

.item-card {
  position: relative;
  group: hover;
}

.item-image-wrapper {
  position: relative;
  overflow: hidden;
  width: 100%;
  /* 保持 3:4 比例 */
  padding-bottom: 133.33%; 
  background-color: #f0f0f0;
  margin-bottom: 1rem;
}

.item-image-wrapper img {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.8s ease, filter 0.5s ease;
}

/* 交互效果：悬停放大+亮度调节 */
.item-card:hover .item-image-wrapper img {
  transform: scale(1.06);
  filter: brightness(1.08);
}

.item-info {
  text-align: left;
}

.item-title {
  font-size: 1.1rem;
  font-weight: 500;
  margin-bottom: 0.3rem;
  display: block;
}

.item-desc {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  line-height: 1.5;
}

/* 美学页面 - 配色色块 */
.color-palette {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  margin-top: 2rem;
}

.color-swatch {
  width: 80px;
  height: 80px;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  font-size: 0.7rem;
  color: #fff;
  padding-bottom: 0.5rem;
  text-shadow: 0 1px 2px rgba(0,0,0,0.3);
  border-radius: 50%; /* 圆形色块 */
}

/* --- 5. 页脚 --- */
footer.site-footer {
  text-align: center;
  padding: 3rem 0;
  margin-top: auto;
  border-top: 1px solid var(--color-border);
  background-color: var(--color-bg-primary);
}

footer.site-footer small {
  font-size: 0.75rem;
  font-weight: 200;
  letter-spacing: 0.1em;
  color: #999;
  font-family: "Helvetica Neue", sans-serif;
}

/* --- 6. 响应式适配 --- */
@media (max-width: 768px) {
  :root {
    --nav-height: 60px;
  }
  
  h1 { font-size: 1.8rem; }
  h2 { font-size: 1.5rem; }
  
  /* 移动端汉堡菜单样式 */
  .menu-toggle {
    display: block;
  }

  .nav-links {
    display: none; /* 默认隐藏 */
    position: absolute;
    top: var(--nav-height);
    left: 0;
    width: 100%;
    background-color: #fff;
    flex-direction: column;
    padding: 1rem 0;
    border-bottom: 1px solid var(--color-border);
    box-shadow: 0 5px 10px rgba(0,0,0,0.05);
  }

  /* 激活状态 */
  .nav-links.active {
    display: flex;
  }

  .nav-links li {
    margin: 0;
    width: 100%;
    text-align: center;
  }

  .nav-links a {
    display: block;
    padding: 1rem;
    font-size: 1rem;
  }
  
  .quick-nav {
    grid-template-columns: 1fr 1fr;
  }

  .hero-section {
    height: 60vh;
  }

  .hero-caption {
    width: 90%;
    bottom: 10%;
  }
}

/* --- 7. 通用辅助类 --- */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.text-center { text-align: center; }
.mt-big { margin-top: 4rem; }
.mb-big { margin-bottom: 4rem; }
.section-title {
  text-align: center;
  margin-bottom: 3rem;
  position: relative;
  display: inline-block;
  left: 50%;
  transform: translateX(-50%);
}

.section-title::after {
  content: '';
  display: block;
  width: 40px;
  height: 2px;
  background-color: var(--color-text-main);
  margin: 1rem auto 0;
}

/* 动态槽位占位符，用于未来扩展 */
.dynamic-slot {
  display: none;
}