/**
 * 糖心vlog - 原创主题样式表
 * 品牌：糖心vlog | 域名：bdrimb.cn
 * 完全原创设计，禁止抄袭
 */

/* ============================
   1. CSS变量 / 设计令牌
   ============================ */
:root {
  /* 品牌色系 - 原创配色 */
  --color-primary: #E8437A;       /* 糖心玫瑰红 */
  --color-primary-dark: #C73060;
  --color-primary-light: #FF6FA0;
  --color-accent: #FF9A3C;        /* 暖橙色 */
  --color-purple: #7B4FD8;        /* 紫罗兰 */
  --color-teal: #00C896;          /* 薄荷绿 */
  --color-live: #FF3B3B;          /* 直播红 */

  /* 中性色 */
  --color-dark: #1A1A2E;
  --color-dark2: #16213E;
  --color-dark3: #0F3460;
  --color-bg: #F7F8FC;
  --color-white: #FFFFFF;
  --color-border: #EAECF0;
  --color-text: #2D2D3A;
  --color-text-light: #5A5A72;
  --color-text-muted: #9B9BB0;

  /* 字体 */
  --font-base: -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Microsoft YaHei', '微软雅黑', 'Helvetica Neue', Arial, sans-serif;
  --font-size-base: 15px;
  --line-height: 1.7;

  /* 间距 */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 40px;
  --space-2xl: 64px;

  /* 圆角 */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  /* 阴影 */
  --shadow-sm: 0 1px 4px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.08);
  --shadow-lg: 0 8px 32px rgba(0,0,0,0.12);
  --shadow-xl: 0 16px 64px rgba(0,0,0,0.16);

  /* 过渡 */
  --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ============================
   2. 重置与基础
   ============================ */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-base);
  font-size: var(--font-size-base);
  line-height: var(--line-height);
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

a:hover { color: var(--color-primary); }

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

ul, ol { list-style: none; }

button {
  cursor: pointer;
  font-family: var(--font-base);
  border: none;
  background: none;
}

input, textarea, select {
  font-family: var(--font-base);
  font-size: var(--font-size-base);
}

h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.3;
  color: var(--color-dark);
}

/* ============================
   3. 布局工具
   ============================ */
.container {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 20px;
}

.section {
  padding: var(--space-2xl) 0;
}

.section-sm {
  padding: var(--space-xl) 0;
}

.section-white { background: var(--color-white); }
.section-dark { background: var(--color-dark); }
.section-dark2 { background: var(--color-dark2); }
.section-pink { background: linear-gradient(135deg, #FFF0F5 0%, #FFF8F0 100%); }

.section-gradient {
  background: linear-gradient(135deg, var(--color-dark) 0%, var(--color-dark3) 50%, var(--color-purple) 100%);
}

.flex-between {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-lg);
  flex-wrap: wrap;
}

.text-center { text-align: center; }

.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--space-lg); }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-lg); }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-lg); }

.mb-24 { margin-bottom: 24px; }
.mb-32 { margin-bottom: 32px; }

/* ============================
   4. 区块标题
   ============================ */
.section-header {
  margin-bottom: 40px;
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  font-weight: 600;
  color: var(--color-primary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 10px;
}

.section-tag::before {
  content: '';
  display: inline-block;
  width: 16px;
  height: 3px;
  background: var(--color-primary);
  border-radius: 2px;
}

.section-title {
  font-size: 32px;
  font-weight: 800;
  color: var(--color-dark);
  margin-bottom: 12px;
  line-height: 1.2;
}

.section-title.white { color: #fff; }

.section-subtitle {
  font-size: 15px;
  color: var(--color-text-light);
  max-width: 600px;
  line-height: 1.7;
}

.section-subtitle.white { color: rgba(255,255,255,0.65); }

.view-all {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-primary);
  white-space: nowrap;
  padding: 8px 0;
}

.view-all:hover { color: var(--color-primary-dark); }

/* ============================
   5. 导航头部
   ============================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--color-dark);
  border-bottom: 1px solid rgba(255,255,255,0.06);
  box-shadow: 0 2px 20px rgba(0,0,0,0.3);
}

.header-inner {
  display: flex;
  align-items: center;
  gap: 20px;
  height: 64px;
}

.site-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.logo-icon {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  object-fit: contain;
}

.logo-text {
  height: 28px;
  width: auto;
  object-fit: contain;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 4px;
  flex: 1;
}

.main-nav a {
  padding: 8px 14px;
  font-size: 14px;
  font-weight: 500;
  color: rgba(255,255,255,0.75);
  border-radius: var(--radius-md);
  transition: var(--transition);
  white-space: nowrap;
}

.main-nav a:hover,
.main-nav a.active {
  color: #fff;
  background: rgba(255,255,255,0.08);
}

.main-nav a.active {
  color: var(--color-primary);
  background: rgba(232,67,122,0.12);
}

.header-search {
  display: flex;
  align-items: center;
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: var(--radius-full);
  overflow: hidden;
  max-width: 240px;
  flex: 1;
}

.header-search input {
  flex: 1;
  background: none;
  border: none;
  outline: none;
  padding: 8px 14px;
  font-size: 13px;
  color: #fff;
}

.header-search input::placeholder { color: rgba(255,255,255,0.4); }

.search-btn {
  padding: 8px 12px;
  color: rgba(255,255,255,0.6);
  font-size: 16px;
  transition: var(--transition);
}

.search-btn:hover { color: var(--color-primary); }

.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.btn-upload {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  background: var(--color-primary);
  color: #fff;
  border-radius: var(--radius-full);
  font-size: 13px;
  font-weight: 600;
  transition: var(--transition);
}

.btn-upload:hover {
  background: var(--color-primary-dark);
  color: #fff;
  transform: translateY(-1px);
}

.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
  margin-left: auto;
}

.menu-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: rgba(255,255,255,0.8);
  border-radius: 2px;
  transition: var(--transition);
}

/* ============================
   6. 搜索栏
   ============================ */
.search-bar-section {
  background: var(--color-dark2);
  padding: 16px 0;
  border-bottom: 1px solid rgba(255,255,255,0.05);
}

.search-bar-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.search-input-wrap {
  display: flex;
  align-items: center;
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: var(--radius-full);
  overflow: hidden;
  max-width: 600px;
}

.search-input-wrap input {
  flex: 1;
  background: none;
  border: none;
  outline: none;
  padding: 10px 20px;
  font-size: 14px;
  color: #fff;
}

.search-input-wrap input::placeholder { color: rgba(255,255,255,0.35); }

.search-submit {
  padding: 10px 20px;
  background: var(--color-primary);
  color: #fff;
  font-size: 16px;
  transition: var(--transition);
}

.search-submit:hover { background: var(--color-primary-dark); }

.search-hot-tags {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  font-size: 13px;
  color: rgba(255,255,255,0.4);
}

.search-hot-tags a {
  color: rgba(255,255,255,0.55);
  padding: 3px 10px;
  background: rgba(255,255,255,0.06);
  border-radius: var(--radius-full);
  font-size: 12px;
  transition: var(--transition);
}

.search-hot-tags a:hover {
  background: rgba(232,67,122,0.15);
  color: var(--color-primary);
}

/* ============================
   7. 英雄区
   ============================ */
.hero-section {
  position: relative;
  min-height: 600px;
  display: flex;
  align-items: center;
  overflow: hidden;
  background: var(--color-dark);
}

.hero-bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  opacity: 0.25;
}

.hero-section .container {
  position: relative;
  z-index: 2;
  padding-top: 60px;
  padding-bottom: 60px;
}

.hero-content {
  max-width: 560px;
}

.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(232,67,122,0.15);
  border: 1px solid rgba(232,67,122,0.3);
  color: var(--color-primary-light);
  padding: 6px 16px;
  border-radius: var(--radius-full);
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 20px;
}

.hero-title {
  font-size: 52px;
  font-weight: 900;
  color: #fff;
  line-height: 1.15;
  margin-bottom: 20px;
  letter-spacing: -0.02em;
}

.hero-title .highlight {
  color: var(--color-primary);
  position: relative;
}

.hero-desc {
  font-size: 16px;
  color: rgba(255,255,255,0.65);
  line-height: 1.8;
  margin-bottom: 32px;
}

.hero-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 40px;
}

.hero-stats {
  display: flex;
  gap: 32px;
  flex-wrap: wrap;
}

.hero-stat-item .num {
  font-size: 28px;
  font-weight: 800;
  color: #fff;
  line-height: 1;
  margin-bottom: 4px;
}

.hero-stat-item .num span:last-child {
  font-size: 16px;
  color: var(--color-primary);
}

.hero-stat-item .label {
  font-size: 13px;
  color: rgba(255,255,255,0.5);
}

.hero-video-preview {
  position: absolute;
  right: 40px;
  top: 50%;
  transform: translateY(-50%);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  width: 440px;
  z-index: 2;
}

.hero-video-card {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  aspect-ratio: 16/10;
  box-shadow: var(--shadow-xl);
  display: block;
}

.hero-video-card img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}

.hero-video-card:hover img { transform: scale(1.05); }

.hero-video-card .play-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,0.3);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: var(--transition);
}

.hero-video-card:hover .play-overlay { opacity: 1; }

.play-btn-circle {
  width: 44px;
  height: 44px;
  background: rgba(232,67,122,0.9);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 16px;
  padding-left: 3px;
}

.hero-video-card .card-label {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  background: linear-gradient(transparent, rgba(0,0,0,0.7));
  color: #fff;
  font-size: 11px;
  font-weight: 600;
  padding: 16px 10px 8px;
}

/* ============================
   8. 按钮
   ============================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 10px 20px;
  border-radius: var(--radius-full);
  font-size: 14px;
  font-weight: 600;
  transition: var(--transition);
  cursor: pointer;
  border: 2px solid transparent;
  white-space: nowrap;
}

.btn-primary {
  background: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
}

.btn-primary:hover {
  background: var(--color-primary-dark);
  border-color: var(--color-primary-dark);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(232,67,122,0.4);
}

.btn-ghost {
  background: rgba(255,255,255,0.1);
  color: #fff;
  border-color: rgba(255,255,255,0.2);
  backdrop-filter: blur(4px);
}

.btn-ghost:hover {
  background: rgba(255,255,255,0.2);
  color: #fff;
  transform: translateY(-2px);
}

.btn-outline {
  background: transparent;
  color: var(--color-primary);
  border-color: var(--color-primary);
}

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

.btn-dark {
  background: var(--color-dark);
  color: #fff;
  border-color: var(--color-dark);
}

.btn-dark:hover {
  background: var(--color-dark2);
  color: #fff;
  transform: translateY(-2px);
}

.btn-lg {
  padding: 14px 28px;
  font-size: 15px;
}

.btn-sm {
  padding: 7px 14px;
  font-size: 13px;
}

/* ============================
   9. 视频卡片
   ============================ */
.video-card {
  display: block;
  background: var(--color-white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  cursor: pointer;
}

.video-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.video-card-thumb {
  position: relative;
  aspect-ratio: 16/9;
  overflow: hidden;
  background: var(--color-dark2);
}

.video-card-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}

.video-card:hover .video-card-thumb img {
  transform: scale(1.05);
}

.duration {
  position: absolute;
  bottom: 8px;
  right: 8px;
  background: rgba(0,0,0,0.75);
  color: #fff;
  font-size: 11px;
  font-weight: 600;
  padding: 2px 7px;
  border-radius: 4px;
}

.play-icon {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: var(--transition);
  background: rgba(0,0,0,0.25);
}

.video-card:hover .play-icon { opacity: 1; }

.play-icon-circle {
  width: 48px;
  height: 48px;
  background: var(--color-primary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 18px;
  padding-left: 4px;
  box-shadow: 0 4px 16px rgba(232,67,122,0.5);
}

.badge-tag {
  position: absolute;
  top: 8px;
  left: 8px;
}

.video-card-body {
  padding: 14px;
}

.video-card-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-dark);
  line-height: 1.5;
  margin-bottom: 10px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.video-card-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  flex-wrap: wrap;
}

.video-card-author {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  color: var(--color-text-muted);
}

.video-card-author img {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  object-fit: cover;
}

.video-card-stats {
  display: flex;
  gap: 8px;
  font-size: 12px;
  color: var(--color-text-muted);
}

/* 大视频卡片 */
.video-card-large {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
  background: var(--color-white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  transition: var(--transition);
}

.video-card-large:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
}

.video-card-large .video-card-thumb {
  aspect-ratio: 16/9;
}

.video-card-large .video-card-body {
  padding: 28px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.video-card-large .video-card-title {
  font-size: 20px;
  font-weight: 700;
  -webkit-line-clamp: 3;
  margin-bottom: 14px;
}

.video-card-desc {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.7;
  margin-bottom: 16px;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* ============================
   10. 徽章
   ============================ */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 3px 10px;
  border-radius: var(--radius-full);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.badge-primary { background: var(--color-primary); color: #fff; }
.badge-accent { background: var(--color-accent); color: #fff; }
.badge-purple { background: var(--color-purple); color: #fff; }
.badge-live { background: var(--color-live); color: #fff; animation: pulse 1.5s infinite; }

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.7; }
}

/* ============================
   11. 统计数字
   ============================ */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-lg);
}

.stat-item {
  text-align: center;
  padding: 32px 20px;
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--radius-lg);
  transition: var(--transition);
}

.stat-item:hover {
  background: rgba(255,255,255,0.08);
  transform: translateY(-4px);
}

.stat-num {
  font-size: 40px;
  font-weight: 900;
  color: #fff;
  line-height: 1;
  margin-bottom: 10px;
}

.stat-num .unit {
  font-size: 20px;
  color: var(--color-primary);
}

.stat-label {
  font-size: 14px;
  color: rgba(255,255,255,0.5);
}

/* ============================
   12. 直播卡片
   ============================ */
.live-card {
  display: block;
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: var(--transition);
}

.live-card:hover {
  transform: translateY(-4px);
  border-color: rgba(232,67,122,0.3);
  box-shadow: 0 8px 32px rgba(232,67,122,0.15);
}

.live-card-thumb {
  position: relative;
  aspect-ratio: 16/9;
  overflow: hidden;
}

.live-card-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}

.live-card:hover .live-card-thumb img { transform: scale(1.05); }

.live-badge {
  position: absolute;
  top: 8px;
  left: 8px;
  background: var(--color-live);
  color: #fff;
  font-size: 11px;
  font-weight: 700;
  padding: 3px 8px;
  border-radius: 4px;
  animation: pulse 1.5s infinite;
}

.live-viewers {
  position: absolute;
  bottom: 8px;
  right: 8px;
  background: rgba(0,0,0,0.7);
  color: #fff;
  font-size: 11px;
  padding: 2px 8px;
  border-radius: 4px;
}

.live-card-body {
  padding: 12px;
}

.live-card-title {
  font-size: 13px;
  font-weight: 600;
  color: rgba(255,255,255,0.85);
  line-height: 1.4;
  margin-bottom: 8px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.live-card-host {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  color: rgba(255,255,255,0.5);
}

.live-card-host img {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  object-fit: cover;
}

/* ============================
   13. 专家卡片
   ============================ */
.expert-card {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.expert-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-xl);
}

.expert-card-img {
  width: 100%;
  aspect-ratio: 4/3;
  object-fit: cover;
}

.expert-card-body {
  padding: 20px;
}

.expert-card-name {
  font-size: 20px;
  font-weight: 800;
  color: var(--color-dark);
  margin-bottom: 4px;
}

.expert-card-title {
  font-size: 13px;
  color: var(--color-primary);
  font-weight: 600;
  margin-bottom: 12px;
}

.expert-card-desc {
  font-size: 13px;
  color: var(--color-text-light);
  line-height: 1.7;
  margin-bottom: 16px;
}

.expert-card-actions {
  display: flex;
  gap: 8px;
}

/* ============================
   14. 弹幕
   ============================ */
.danmaku-container {
  position: relative;
  height: 40px;
  overflow: hidden;
  pointer-events: none;
}

.danmaku-item {
  position: absolute;
  right: -300px;
  white-space: nowrap;
  font-size: 13px;
  color: rgba(255,255,255,0.7);
  animation: danmaku-scroll linear forwards;
  background: rgba(255,255,255,0.05);
  padding: 3px 10px;
  border-radius: 12px;
}

@keyframes danmaku-scroll {
  from { right: -300px; }
  to { right: 110%; }
}

/* ============================
   15. 分类标签
   ============================ */
.category-tabs {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  padding: 4px 0;
}

.category-tab {
  padding: 8px 18px;
  border-radius: var(--radius-full);
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text-light);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  transition: var(--transition);
  cursor: pointer;
}

.category-tab:hover {
  color: var(--color-primary);
  border-color: var(--color-primary);
  background: rgba(232,67,122,0.04);
}

.category-tab.active {
  background: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
}

/* ============================
   16. 合作伙伴
   ============================ */
.partners-wall {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  justify-content: center;
}

.partner-logo {
  padding: 14px 28px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text-muted);
  transition: var(--transition);
}

.partner-logo:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background: rgba(232,67,122,0.04);
}

/* ============================
   17. 步骤
   ============================ */
.howto-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-lg);
  position: relative;
}

.howto-steps::before {
  content: '';
  position: absolute;
  top: 32px;
  left: 10%;
  right: 10%;
  height: 2px;
  background: linear-gradient(to right, var(--color-primary), var(--color-accent));
  z-index: 0;
}

.howto-step {
  text-align: center;
  position: relative;
  z-index: 1;
}

.howto-step-num {
  width: 64px;
  height: 64px;
  background: var(--color-primary);
  color: #fff;
  border-radius: 50%;
  font-size: 24px;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
  box-shadow: 0 4px 20px rgba(232,67,122,0.35);
  border: 4px solid #fff;
}

.howto-step h4 {
  font-size: 16px;
  font-weight: 700;
  color: var(--color-dark);
  margin-bottom: 8px;
}

.howto-step p {
  font-size: 13px;
  color: var(--color-text-light);
  line-height: 1.7;
}

/* ============================
   18. 评价卡片
   ============================ */
.review-card {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  padding: 20px;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.review-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.review-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}

.review-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  color: #fff;
  font-size: 16px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.review-user-info .name {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-dark);
}

.review-user-info .date {
  font-size: 12px;
  color: var(--color-text-muted);
}

.review-stars {
  color: #FFB800;
  font-size: 14px;
  margin-bottom: 10px;
  letter-spacing: 2px;
}

.review-text {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.7;
}

/* ============================
   19. FAQ
   ============================ */
.faq-item {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  margin-bottom: 12px;
  box-shadow: var(--shadow-sm);
}

.faq-question {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 18px 20px;
  cursor: pointer;
  transition: var(--transition);
}

.faq-question:hover { background: rgba(232,67,122,0.03); }

.q-icon {
  width: 28px;
  height: 28px;
  background: var(--color-primary);
  color: #fff;
  border-radius: 6px;
  font-size: 13px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.faq-question span {
  flex: 1;
  font-size: 15px;
  font-weight: 600;
  color: var(--color-dark);
}

.toggle-icon {
  font-size: 20px;
  color: var(--color-text-muted);
  transition: transform 0.3s ease;
}

.faq-item.open .toggle-icon { transform: rotate(180deg); }

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease;
}

.faq-item.open .faq-answer { max-height: 300px; }

.faq-answer p {
  padding: 0 20px 18px 60px;
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.8;
}

/* ============================
   20. 分享按钮
   ============================ */
.share-bar {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.share-btn {
  padding: 8px 16px;
  border-radius: var(--radius-full);
  font-size: 13px;
  font-weight: 600;
  transition: var(--transition);
  border: 1px solid rgba(255,255,255,0.15);
  color: rgba(255,255,255,0.8);
  background: rgba(255,255,255,0.06);
}

.share-btn:hover {
  transform: translateY(-2px);
  background: rgba(255,255,255,0.12);
  color: #fff;
}

/* ============================
   21. 视频播放器
   ============================ */
.video-player-wrap {
  position: relative;
  width: 100%;
  aspect-ratio: 16/9;
  background: #000;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-xl);
}

/* ============================
   22. 面包屑
   ============================ */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 12px 0;
  font-size: 13px;
  color: var(--color-text-muted);
}

.breadcrumb a {
  color: var(--color-text-muted);
  transition: var(--transition);
}

.breadcrumb a:hover { color: var(--color-primary); }

.breadcrumb .sep { color: var(--color-border); }

.breadcrumb .current {
  color: var(--color-text);
  font-weight: 500;
}

/* ============================
   23. 页面横幅
   ============================ */
.page-banner {
  background: linear-gradient(135deg, var(--color-dark) 0%, var(--color-dark3) 60%, var(--color-purple) 100%);
  padding: 60px 20px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.page-banner::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at center, rgba(232,67,122,0.15) 0%, transparent 70%);
}

.page-banner h1 {
  font-size: 40px;
  font-weight: 900;
  color: #fff;
  margin-bottom: 12px;
  position: relative;
  z-index: 1;
}

.page-banner p {
  font-size: 16px;
  color: rgba(255,255,255,0.6);
  position: relative;
  z-index: 1;
}

/* ============================
   24. 联系卡片
   ============================ */
.contact-card {
  text-align: center;
}

.qr-img {
  width: 120px;
  height: 120px;
  object-fit: contain;
  border-radius: var(--radius-md);
  background: #fff;
  padding: 8px;
  margin: 0 auto 10px;
}

.qr-title {
  font-size: 13px;
  font-weight: 600;
  color: rgba(255,255,255,0.8);
  margin-bottom: 4px;
}

.qr-desc {
  font-size: 12px;
  color: rgba(255,255,255,0.45);
}

/* ============================
   25. 页脚
   ============================ */
.site-footer {
  background: var(--color-dark);
  color: rgba(255,255,255,0.65);
  padding-top: 60px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 40px;
  border-bottom: 1px solid rgba(255,255,255,0.08);
}

.footer-brand .logo-wrap {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
}

.footer-brand .logo-wrap img {
  width: 36px;
  height: 36px;
  border-radius: 8px;
}

.footer-brand .logo-wrap span {
  font-size: 20px;
  font-weight: 800;
  color: #fff;
}

.footer-brand p {
  font-size: 13px;
  line-height: 1.8;
  color: rgba(255,255,255,0.45);
  margin-bottom: 20px;
}

.footer-social {
  display: flex;
  gap: 10px;
}

.footer-social a {
  width: 36px;
  height: 36px;
  background: rgba(255,255,255,0.06);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  transition: var(--transition);
}

.footer-social a:hover {
  background: var(--color-primary);
  transform: translateY(-2px);
}

.footer-col h4 {
  font-size: 14px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 16px;
}

.footer-col ul {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-col ul li a {
  font-size: 13px;
  color: rgba(255,255,255,0.45);
  transition: var(--transition);
}

.footer-col ul li a:hover {
  color: var(--color-primary);
  padding-left: 4px;
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 0;
  flex-wrap: wrap;
  gap: 12px;
}

.copyright {
  font-size: 13px;
  color: rgba(255,255,255,0.35);
}

.copyright a {
  color: var(--color-primary);
}

.update-time {
  font-size: 13px;
  color: rgba(255,255,255,0.35);
}

.footer-links {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.footer-links a {
  font-size: 12px;
  color: rgba(255,255,255,0.35);
  transition: var(--transition);
}

.footer-links a:hover { color: var(--color-primary); }

/* ============================
   26. 响应式
   ============================ */
@media (max-width: 1200px) {
  .hero-video-preview {
    display: none;
  }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 900px) {
  .section-title { font-size: 26px; }
  .hero-title { font-size: 38px; }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .howto-steps { grid-template-columns: repeat(2, 1fr); }
  .howto-steps::before { display: none; }
  .video-card-large { grid-template-columns: 1fr; }
}

@media (max-width: 680px) {
  .section { padding: 40px 0; }
  .section-title { font-size: 22px; }
  .hero-title { font-size: 30px; }
  .hero-section { min-height: auto; }
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr; }
  .howto-steps { grid-template-columns: 1fr; }
  .header-search { display: none; }
  .header-actions .btn-upload span:last-child { display: none; }
  .menu-toggle { display: flex; }
  .main-nav {
    display: none;
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--color-dark);
    flex-direction: column;
    padding: 16px;
    gap: 4px;
    border-bottom: 1px solid rgba(255,255,255,0.08);
    z-index: 999;
    box-shadow: var(--shadow-xl);
  }
  .main-nav.open { display: flex; }
  .main-nav a { padding: 12px 16px; }
  .footer-bottom { flex-direction: column; align-items: flex-start; }
}

/* ============================
   27. 无障碍
   ============================ */
:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

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

/* ============================
   28. 图片加载动画
   ============================ */
img {
  transition: opacity 0.3s ease;
}

img.loaded { opacity: 1; }