/* 
 * 全局样式表
 * 风格：极简、现代、优雅
 * 兼容：Pico.css 扩展
 */

:root {
  --primary-color: #d8c3b8; /* 柔和的裸粉色/浅驼色 */
  --text-main: #333333;
  --text-light: #666666;
  --bg-body: #ffffff;
  --bg-secondary: #f8f8f8;
  --font-main: "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --nav-height: 80px;
  --transition-smooth: all 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

/* 基础重置与排版 */
html {
  scroll-behavior: smooth;
  font-family: var(--font-main);
}

body {
  color: var(--text-main);
  background-color: var(--bg-body);
  margin: 0;
  padding: 0;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

/* 覆盖 Pico.css 的部分默认样式以符合极简风格 */
:where(a:not([role="button"])) {
  color: var(--text-main);
  text-decoration: none;
  transition: color 0.3s ease;
}

:where(a:not([role="button"])):hover {
  color: var(--primary-color);
  text-decoration: none;
}

h1, h2, h3, h4 {
  font-weight: 400;
  letter-spacing: 0.05em;
  margin-bottom: 1rem;
}

/* 布局工具类 */
.container-fluid {
  max-width: 1440px;
  margin: 0 auto;
  padding: 0 2rem;
}

.section-padding {
  padding: 6rem 0;
}

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

/* 导航栏 */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--nav-height);
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  z-index: 1000;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 4%;
  box-shadow: 0 1px 0 rgba(0,0,0,0.03);
  transition: transform 0.3s ease;
}

.nav-brand {
  font-size: 1.5rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: #000;
}

.nav-links {
  display: flex;
  gap: 3rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-links a {
  font-size: 0.95rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  position: relative;
  padding-bottom: 4px;
}

.nav-links a.active::after,
.nav-links a:hover::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 1px;
  background-color: var(--text-main);
}

/* 移动端菜单按钮 */
.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  padding: 0;
}

/* 首页轮播图 */
.hero-slider {
  position: relative;
  height: 100vh;
  width: 100%;
  overflow: hidden;
}

.slide {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  transition: opacity 1.2s ease-in-out;
  background-size: cover;
  background-position: center top;
}

.slide.active {
  opacity: 1;
}

.slide::after {
  content: '';
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,0.15); /* 轻微遮罩提升文字可读性 */
}

.hero-content {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  z-index: 10;
  color: #fff;
  text-align: center;
  width: 90%;
  max-width: 800px;
}

.hero-title {
  font-size: 3.5rem;
  margin-bottom: 1.5rem;
  font-weight: 300;
  letter-spacing: 0.1em;
  text-shadow: 0 2px 10px rgba(0,0,0,0.1);
  animation: fadeUp 1s ease-out 0.3s backwards;
}

.hero-subtitle {
  font-size: 1.2rem;
  font-weight: 300;
  letter-spacing: 0.05em;
  margin-bottom: 2.5rem;
  animation: fadeUp 1s ease-out 0.6s backwards;
}

.btn-minimal {
  display: inline-block;
  padding: 12px 36px;
  border: 1px solid #fff;
  color: #fff;
  text-transform: uppercase;
  font-size: 0.85rem;
  letter-spacing: 0.15em;
  transition: all 0.3s ease;
  background: transparent;
  animation: fadeUp 1s ease-out 0.9s backwards;
}

.btn-minimal:hover {
  background: #fff;
  color: #000;
}

/* 轮播指示点 */
.slider-dots {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 15px;
  z-index: 20;
}

.dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: rgba(255,255,255,0.4);
  cursor: pointer;
  transition: all 0.3s;
}

.dot.active {
  background: #fff;
  transform: scale(1.2);
}

/* 首页板块导航 */
.category-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2px;
  padding: 6rem 2rem;
}

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

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

.category-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.3s;
}

.category-title {
  color: #fff;
  font-size: 1.5rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  border-bottom: 1px solid transparent;
  padding-bottom: 5px;
  transition: border-color 0.3s;
}

.category-card:hover .category-img { transform: scale(1.05); }
.category-card:hover .category-overlay { background: rgba(0,0,0,0.3); }
.category-card:hover .category-title { border-bottom-color: #fff; }

/* 设计故事页 */
.story-block {
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  margin-bottom: 8rem;
  gap: 4rem;
}

.story-block:nth-child(even) { direction: rtl; }
.story-block:nth-child(even) .story-text { direction: ltr; }

.story-img-container {
  width: 100%;
  height: 600px;
  overflow: hidden;
}

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

.story-text {
  padding: 0 4rem;
}

.story-text h2 {
  font-size: 2rem;
  margin-bottom: 1.5rem;
  color: var(--text-main);
}

.story-text p {
  color: var(--text-light);
  line-height: 1.8;
  font-size: 1rem;
  text-align: justify;
}

/* 视觉图库页 */
.gallery-nav {
  display: flex;
  justify-content: center;
  gap: 2rem;
  margin-bottom: 4rem;
  flex-wrap: wrap;
}

.gallery-filter {
  background: none;
  border: none;
  color: var(--text-light);
  cursor: pointer;
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  padding-bottom: 5px;
  border-bottom: 1px solid transparent;
}

.gallery-filter.active, .gallery-filter:hover {
  color: var(--text-main);
  border-bottom-color: var(--text-main);
}

.gallery-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 30px;
}

.gallery-item {
  position: relative;
  overflow: hidden;
  cursor: zoom-in;
  aspect-ratio: 2/3;
}

.gallery-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.6s ease;
}

.gallery-item-info {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  padding: 20px;
  background: linear-gradient(to top, rgba(0,0,0,0.6), transparent);
  color: #fff;
  opacity: 0;
  transform: translateY(10px);
  transition: all 0.4s ease;
}

.gallery-item:hover img { transform: scale(1.08); }
.gallery-item:hover .gallery-item-info { opacity: 1; transform: translateY(0); }

/* 页脚 */
.site-footer {
  padding: 4rem 2rem;
  text-align: center;
  border-top: 1px solid #eee;
  margin-top: 4rem;
}

.footer-copy {
  font-size: 0.8rem;
  color: #999;
  letter-spacing: 0.1em;
}

/* 动画关键帧 */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

/* 响应式适配 */
@media (max-width: 1024px) {
  .hero-title { font-size: 2.5rem; }
  .category-grid { grid-template-columns: repeat(2, 1fr); padding: 4rem 1rem; }
  .story-block { gap: 2rem; margin-bottom: 4rem; }
  .story-text { padding: 0 1rem; }
}

@media (max-width: 768px) {
  :root { --nav-height: 60px; }
  
  .mobile-menu-btn { display: block; }
  .nav-links {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    width: 100%;
    height: 0;
    background: #fff;
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
    overflow: hidden;
    transition: height 0.3s ease;
    padding-top: 0;
  }
  
  .nav-links.open {
    height: calc(100vh - var(--nav-height));
    padding-top: 2rem;
    border-top: 1px solid #eee;
  }
  
  .hero-title { font-size: 2rem; }
  .category-grid { grid-template-columns: 1fr; }
  .story-block { grid-template-columns: 1fr; direction: ltr !important; }
  .story-img-container { height: 400px; }
  .story-text { padding: 2rem 0; }
  .gallery-grid { grid-template-columns: 1fr; }
}