/* ===== 糖心vlog 全站样式 ===== */
/* 原创配色: 珊瑚红 #FF6B6B, 暖橙 #FF9A56, 深靛 #1A1A2E, 暗蓝 #16213E, 星空紫 #0F3460, 亮白 #EAEAEA */

:root {
  --coral: #FF6B6B;
  --orange: #FF9A56;
  --deep-dark: #1A1A2E;
  --dark-blue: #16213E;
  --star-purple: #0F3460;
  --light: #EAEAEA;
  --white: #FFFFFF;
  --text-main: #E0E0E0;
  --text-muted: #A0A0B0;
  --card-bg: #1E2A3A;
  --card-hover: #253545;
  --border-color: #2A3A4A;
  --gradient-main: linear-gradient(135deg, var(--coral), var(--orange));
  --shadow-card: 0 4px 20px rgba(0,0,0,0.3);
  --radius: 12px;
  --transition: all 0.3s ease;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

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

body {
  font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  background-color: var(--deep-dark);
  color: var(--text-main);
  line-height: 1.7;
  overflow-x: hidden;
}

a { color: var(--coral); text-decoration: none; transition: var(--transition); }
a:hover { color: var(--orange); }

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

.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }

/* ===== 头部导航 ===== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: rgba(26,26,46,0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-color);
  transition: var(--transition);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 20px;
  max-width: 1200px;
  margin: 0 auto;
}

.logo-area {
  display: flex;
  align-items: center;
  gap: 10px;
}

.logo-area img {
  width: 40px;
  height: 40px;
  border-radius: 8px;
}

.logo-area h1,
.logo-area .logo-text {
  font-size: 1.3rem;
  background: var(--gradient-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  font-weight: 700;
}

.main-nav { display: flex; align-items: center; gap: 0; }

.main-nav a {
  color: var(--text-main);
  padding: 8px 14px;
  font-size: 0.9rem;
  border-radius: 6px;
  transition: var(--transition);
  white-space: nowrap;
}

.main-nav a:hover,
.main-nav a.active {
  color: var(--coral);
  background: rgba(255,107,107,0.1);
}

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

/* 搜索框 */
.search-bar {
  background: var(--dark-blue);
  padding: 10px 0;
  border-bottom: 1px solid var(--border-color);
  margin-top: 60px;
}

.search-bar .container {
  display: flex;
  justify-content: center;
}

.search-box {
  display: flex;
  max-width: 600px;
  width: 100%;
  background: var(--card-bg);
  border-radius: 30px;
  overflow: hidden;
  border: 1px solid var(--border-color);
}

.search-box input {
  flex: 1;
  padding: 10px 20px;
  background: transparent;
  border: none;
  color: var(--text-main);
  font-size: 0.95rem;
  outline: none;
}

.search-box input::placeholder { color: var(--text-muted); }

.search-box button {
  padding: 10px 24px;
  background: var(--gradient-main);
  border: none;
  color: var(--white);
  font-size: 0.95rem;
  cursor: pointer;
  transition: var(--transition);
}

.search-box button:hover { opacity: 0.9; }

/* ===== Banner ===== */
.hero-banner {
  position: relative;
  width: 100%;
  min-height: 500px;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero-banner .bg-img {
  position: absolute;
  top: 0; left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: brightness(0.5);
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  padding: 60px 20px;
  max-width: 800px;
}

.hero-content h2 {
  font-size: 2.5rem;
  margin-bottom: 16px;
  background: var(--gradient-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-content p {
  font-size: 1.15rem;
  color: var(--light);
  margin-bottom: 24px;
  line-height: 1.8;
}

.btn-primary {
  display: inline-block;
  padding: 12px 36px;
  background: var(--gradient-main);
  color: var(--white);
  border-radius: 30px;
  font-size: 1rem;
  font-weight: 600;
  transition: var(--transition);
  border: none;
  cursor: pointer;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(255,107,107,0.4);
  color: var(--white);
}

.btn-outline {
  display: inline-block;
  padding: 10px 28px;
  border: 2px solid var(--coral);
  color: var(--coral);
  border-radius: 30px;
  font-size: 0.95rem;
  transition: var(--transition);
}

.btn-outline:hover {
  background: var(--coral);
  color: var(--white);
}

/* ===== 通用板块 ===== */
.section {
  padding: 60px 0;
}

.section-alt {
  background: var(--dark-blue);
}

.section-title {
  text-align: center;
  margin-bottom: 40px;
}

.section-title h2 {
  font-size: 1.8rem;
  color: var(--white);
  margin-bottom: 10px;
}

.section-title h3 {
  font-size: 1.5rem;
  color: var(--white);
  margin-bottom: 10px;
}

.section-title p {
  color: var(--text-muted);
  font-size: 1rem;
}

.title-accent {
  display: inline-block;
  width: 60px;
  height: 3px;
  background: var(--gradient-main);
  border-radius: 2px;
  margin-bottom: 12px;
}

/* ===== 视频卡片 ===== */
.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}

.video-card {
  background: var(--card-bg);
  border-radius: var(--radius);
  overflow: hidden;
  transition: var(--transition);
  border: 1px solid var(--border-color);
}

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

.video-thumb {
  position: relative;
  width: 100%;
  padding-top: 56.25%;
  overflow: hidden;
  cursor: pointer;
}

.video-thumb img {
  position: absolute;
  top: 0; left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: var(--transition);
}

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

.play-btn {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 56px;
  height: 56px;
  background: rgba(255,107,107,0.85);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: var(--transition);
  z-index: 3;
}

.play-btn::after {
  content: '';
  display: block;
  width: 0;
  height: 0;
  border-style: solid;
  border-width: 10px 0 10px 18px;
  border-color: transparent transparent transparent var(--white);
  margin-left: 3px;
}

.video-thumb:hover .play-btn {
  opacity: 1;
}

.video-duration {
  position: absolute;
  bottom: 8px;
  right: 8px;
  background: rgba(0,0,0,0.75);
  color: var(--white);
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 0.8rem;
}

.video-info {
  padding: 14px;
}

.video-info h4 {
  font-size: 0.95rem;
  color: var(--white);
  margin-bottom: 6px;
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.video-meta {
  display: flex;
  gap: 12px;
  color: var(--text-muted);
  font-size: 0.8rem;
}

.video-meta span { display: flex; align-items: center; gap: 4px; }

/* ===== 专家卡片 ===== */
.expert-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 24px;
}

.expert-card {
  background: var(--card-bg);
  border-radius: var(--radius);
  padding: 24px;
  text-align: center;
  border: 1px solid var(--border-color);
  transition: var(--transition);
}

.expert-card:hover {
  border-color: var(--coral);
  transform: translateY(-4px);
  box-shadow: var(--shadow-card);
}

.expert-card img {
  width: 100px;
  height: 100px;
  border-radius: 50%;
  margin: 0 auto 16px;
  border: 3px solid var(--coral);
  object-fit: cover;
}

.expert-card h4 {
  color: var(--white);
  margin-bottom: 4px;
}

.expert-card .role {
  color: var(--coral);
  font-size: 0.85rem;
  margin-bottom: 10px;
}

.expert-card p {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-bottom: 12px;
}

.expert-card .awards {
  color: var(--orange);
  font-size: 0.8rem;
  margin-bottom: 12px;
}

.expert-actions {
  display: flex;
  gap: 8px;
  justify-content: center;
  flex-wrap: wrap;
}

.expert-actions a {
  padding: 6px 16px;
  border-radius: 20px;
  font-size: 0.8rem;
}

/* ===== 社区模块 ===== */
.community-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 20px;
}

.community-card {
  background: var(--card-bg);
  border-radius: var(--radius);
  padding: 24px;
  text-align: center;
  border: 1px solid var(--border-color);
  transition: var(--transition);
}

.community-card:hover {
  border-color: var(--orange);
  transform: translateY(-3px);
}

.community-icon {
  font-size: 2.5rem;
  margin-bottom: 12px;
}

.community-card h4 {
  color: var(--white);
  margin-bottom: 8px;
  font-size: 1rem;
}

.community-card p {
  color: var(--text-muted);
  font-size: 0.85rem;
}

/* ===== FAQ ===== */
.faq-list { max-width: 800px; margin: 0 auto; }

.faq-item {
  background: var(--card-bg);
  border-radius: var(--radius);
  margin-bottom: 12px;
  border: 1px solid var(--border-color);
  overflow: hidden;
}

.faq-question {
  padding: 16px 20px;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--white);
  font-weight: 600;
  transition: var(--transition);
}

.faq-question:hover { color: var(--coral); }

.faq-question .arrow {
  transition: var(--transition);
  font-size: 1.2rem;
}

.faq-item.active .faq-question .arrow {
  transform: rotate(180deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
  padding: 0 20px;
  color: var(--text-muted);
  line-height: 1.7;
}

.faq-item.active .faq-answer {
  max-height: 300px;
  padding: 0 20px 16px;
}

/* ===== 用户评论 ===== */
.review-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 20px;
}

.review-card {
  background: var(--card-bg);
  border-radius: var(--radius);
  padding: 20px;
  border: 1px solid var(--border-color);
  transition: var(--transition);
}

.review-card:hover {
  border-color: var(--coral);
}

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

.review-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--gradient-main);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
  font-weight: 700;
  font-size: 1.1rem;
}

.review-user { color: var(--white); font-weight: 600; }
.review-date { color: var(--text-muted); font-size: 0.8rem; }
.review-stars { color: var(--orange); font-size: 0.9rem; letter-spacing: 2px; }

.review-card p {
  color: var(--text-muted);
  font-size: 0.9rem;
  line-height: 1.7;
}

/* ===== 合作品牌 ===== */
.brand-wall {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  justify-content: center;
  align-items: center;
}

.brand-wall .brand-item {
  background: var(--card-bg);
  padding: 16px 28px;
  border-radius: var(--radius);
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  font-size: 0.95rem;
  transition: var(--transition);
}

.brand-wall .brand-item:hover {
  border-color: var(--coral);
  color: var(--white);
}

/* ===== How-To 指南 ===== */
.howto-steps {
  max-width: 700px;
  margin: 0 auto;
}

.howto-step {
  display: flex;
  gap: 16px;
  margin-bottom: 20px;
  align-items: flex-start;
}

.step-num {
  width: 40px;
  height: 40px;
  min-width: 40px;
  border-radius: 50%;
  background: var(--gradient-main);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
  font-weight: 700;
  font-size: 1.1rem;
}

.step-text {
  color: var(--text-main);
  font-size: 0.95rem;
  padding-top: 8px;
}

/* ===== 联系我们 ===== */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}

.contact-card {
  background: var(--card-bg);
  border-radius: var(--radius);
  padding: 24px;
  border: 1px solid var(--border-color);
}

.contact-card h4 {
  color: var(--white);
  margin-bottom: 12px;
  font-size: 1.05rem;
}

.contact-card p {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-bottom: 8px;
}

/* ===== 分享按钮 ===== */
.share-bar {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
  padding: 20px 0;
}

.share-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 20px;
  border-radius: 20px;
  font-size: 0.85rem;
  color: var(--white);
  transition: var(--transition);
}

.share-btn:hover { transform: translateY(-2px); color: var(--white); }
.share-wechat { background: #07C160; }
.share-weibo { background: #E6162D; }
.share-douyin { background: #161823; border: 1px solid #333; }
.share-bilibili { background: #00A1D6; }

/* ===== 页脚 ===== */
.site-footer {
  background: var(--dark-blue);
  border-top: 1px solid var(--border-color);
  padding: 40px 0 20px;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 30px;
  margin-bottom: 30px;
}

.footer-col h4 {
  color: var(--white);
  margin-bottom: 14px;
  font-size: 1rem;
}

.footer-col p,
.footer-col a {
  color: var(--text-muted);
  font-size: 0.85rem;
  display: block;
  margin-bottom: 6px;
}

.footer-col a:hover { color: var(--coral); }

.footer-col img {
  width: 120px;
  border-radius: 8px;
  margin-top: 8px;
}

.footer-bottom {
  text-align: center;
  padding-top: 20px;
  border-top: 1px solid var(--border-color);
  color: var(--text-muted);
  font-size: 0.8rem;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 10px;
}

.footer-logo img {
  width: 36px;
  height: 36px;
  border-radius: 6px;
}

/* ===== AI赋能板块 ===== */
.ai-features {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 24px;
}

.ai-card {
  background: var(--card-bg);
  border-radius: var(--radius);
  padding: 28px;
  border: 1px solid var(--border-color);
  transition: var(--transition);
}

.ai-card:hover {
  border-color: var(--star-purple);
  transform: translateY(-3px);
}

.ai-card h4 {
  color: var(--white);
  margin-bottom: 10px;
  font-size: 1.05rem;
}

.ai-card p {
  color: var(--text-muted);
  font-size: 0.9rem;
}

.ai-icon {
  font-size: 2rem;
  margin-bottom: 12px;
}

/* ===== 面包屑 ===== */
.breadcrumb {
  padding: 12px 0;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.breadcrumb a { color: var(--text-muted); }
.breadcrumb a:hover { color: var(--coral); }
.breadcrumb span { margin: 0 6px; }

/* ===== 内页通用 ===== */
.page-hero {
  padding: 100px 0 40px;
  text-align: center;
  background: var(--dark-blue);
}

.page-hero h2 {
  font-size: 2rem;
  color: var(--white);
  margin-bottom: 10px;
}

.page-hero p {
  color: var(--text-muted);
  max-width: 600px;
  margin: 0 auto;
}

.page-content {
  padding: 40px 0 60px;
}

.page-content h3 {
  color: var(--white);
  font-size: 1.3rem;
  margin-bottom: 16px;
  margin-top: 30px;
}

.page-content p {
  color: var(--text-main);
  margin-bottom: 14px;
  line-height: 1.8;
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 16px 0;
}

.tag {
  display: inline-block;
  padding: 4px 14px;
  background: rgba(255,107,107,0.15);
  color: var(--coral);
  border-radius: 16px;
  font-size: 0.8rem;
}

/* ===== 响应式 ===== */
@media (max-width: 768px) {
  .main-nav {
    display: none;
    position: absolute;
    top: 60px;
    left: 0;
    width: 100%;
    background: var(--deep-dark);
    flex-direction: column;
    padding: 10px 0;
    border-bottom: 1px solid var(--border-color);
  }

  .main-nav.open { display: flex; }

  .main-nav a {
    padding: 12px 20px;
    border-radius: 0;
  }

  .mobile-toggle { display: block; }

  .hero-content h2 { font-size: 1.6rem; }
  .hero-content p { font-size: 0.95rem; }
  .hero-banner { min-height: 380px; }

  .section-title h2 { font-size: 1.4rem; }

  .video-grid { grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); }
  .expert-grid { grid-template-columns: 1fr; }
  .review-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .ai-features { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
  .footer-grid { grid-template-columns: 1fr; }
  .video-grid { grid-template-columns: 1fr; }
  .community-grid { grid-template-columns: 1fr 1fr; }
}

/* ===== 懒加载 ===== */
img[loading="lazy"] {
  opacity: 0;
  transition: opacity 0.3s ease;
}

img[loading="lazy"].loaded,
img.loaded {
  opacity: 1;
}

/* 无JS回退：确保图片可见 */
@media (scripting: none) {
  img[loading="lazy"] { opacity: 1; }
}

/* ===== 动画 ===== */
.fade-in {
  opacity: 1;
  transform: translateY(0);
}

/* ===== 无障碍焦点 ===== */
a:focus-visible,
button:focus-visible,
input:focus-visible {
  outline: 2px solid var(--coral);
  outline-offset: 2px;
}

/* ===== 标签云居中 ===== */
.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 16px 0;
}

/* ===== 编辑信息样式 ===== */
.editorial-info {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 8px;
}