/* ============================================
   糖心vlog 官网样式表
   品牌：糖心vlog | 域名：mkuwv57.cn
   ============================================ */

/* === CSS Variables === */
:root {
  --primary: #FF2D78;
  --primary-dark: #D4145A;
  --secondary: #FF8C42;
  --accent: #8B5CF6;
  --dark: #1a1a2e;
  --darker: #16213e;
  --light: #f8f9fa;
  --text: #333333;
  --text-light: #666666;
  --text-muted: #999999;
  --border: #e5e7eb;
  --shadow: 0 2px 15px rgba(0,0,0,0.08);
  --shadow-lg: 0 10px 40px rgba(0,0,0,0.12);
  --radius: 12px;
  --radius-sm: 8px;
  --transition: all 0.3s ease;
  --max-width: 1200px;
  --gradient: linear-gradient(135deg, var(--primary), var(--secondary));
}

/* === Reset & Base === */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  color: var(--text);
  background: var(--light);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

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

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

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

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}

/* === Header === */
.site-header {
  background: #fff;
  box-shadow: 0 2px 10px rgba(0,0,0,0.06);
  position: sticky;
  top: 0;
  z-index: 1000;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 20px;
  max-width: var(--max-width);
  margin: 0 auto;
}

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

.site-logo img {
  height: 42px;
  width: auto;
}

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

/* Navigation */
.main-nav {
  display: flex;
  align-items: center;
  gap: 6px;
}

.main-nav a {
  color: var(--text);
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-weight: 500;
  transition: var(--transition);
  white-space: nowrap;
}

.main-nav a:hover,
.main-nav a.active {
  color: var(--primary);
  background: rgba(255,45,120,0.06);
}

/* Search Box */
.search-bar {
  background: #f5f5f5;
  border-bottom: 1px solid var(--border);
  padding: 10px 0;
}

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

.search-form {
  display: flex;
  max-width: 560px;
  width: 100%;
  background: #fff;
  border-radius: 50px;
  overflow: hidden;
  border: 2px solid var(--border);
  transition: var(--transition);
}

.search-form:focus-within {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(255,45,120,0.1);
}

.search-form input {
  flex: 1;
  border: none;
  padding: 10px 20px;
  font-size: 0.95rem;
  outline: none;
  background: transparent;
}

.search-form button {
  background: var(--gradient);
  color: #fff;
  border: none;
  padding: 10px 24px;
  cursor: pointer;
  font-size: 0.95rem;
  font-weight: 500;
  transition: var(--transition);
}

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

/* Mobile Menu Toggle */
.menu-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--text);
  padding: 5px;
}

/* === Hero Banner === */
.hero-section {
  position: relative;
  overflow: hidden;
  background: var(--dark);
  min-height: 420px;
  display: flex;
  align-items: center;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  opacity: 0.6;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(26,26,46,0.85), rgba(255,45,120,0.3));
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  color: #fff;
  padding: 60px 20px;
  max-width: 800px;
  margin: 0 auto;
}

.hero-content h1 {
  font-size: 2.6rem;
  font-weight: 800;
  margin-bottom: 16px;
  line-height: 1.3;
  text-shadow: 0 2px 10px rgba(0,0,0,0.3);
}

.hero-content p {
  font-size: 1.15rem;
  opacity: 0.92;
  margin-bottom: 28px;
  line-height: 1.7;
}

.hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: center;
  margin-top: 20px;
}

.hero-tags span {
  background: rgba(255,255,255,0.15);
  backdrop-filter: blur(10px);
  padding: 6px 18px;
  border-radius: 50px;
  font-size: 0.88rem;
  border: 1px solid rgba(255,255,255,0.2);
}

/* === Section Common === */
.section {
  padding: 60px 0;
}

.section-alt {
  background: #fff;
}

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

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

.section-title h2 {
  font-size: 1.9rem;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--text);
}

.section-dark .section-title h2 {
  color: #fff;
}

.section-title p {
  color: var(--text-light);
  font-size: 1rem;
  max-width: 600px;
  margin: 0 auto;
}

.section-dark .section-title p {
  color: rgba(255,255,255,0.7);
}

/* Breadcrumb */
.breadcrumb {
  padding: 15px 0;
  font-size: 0.88rem;
  color: var(--text-muted);
}

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

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

.breadcrumb span {
  margin: 0 6px;
}

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

.video-card {
  background: #fff;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: var(--transition);
  cursor: pointer;
}

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

.video-thumb {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16/9;
  background: #000;
}

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

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

.video-play-btn {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) scale(0.8);
  width: 60px;
  height: 60px;
  background: rgba(255,45,120,0.85);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: var(--transition);
}

.video-card:hover .video-play-btn {
  opacity: 1;
  transform: translate(-50%, -50%) scale(1);
}

.video-play-btn::after {
  content: '';
  width: 0;
  height: 0;
  border-style: solid;
  border-width: 10px 0 10px 18px;
  border-color: transparent transparent transparent #fff;
  margin-left: 3px;
}

.video-duration {
  position: absolute;
  bottom: 8px;
  right: 8px;
  background: rgba(0,0,0,0.75);
  color: #fff;
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 0.78rem;
}

.video-info {
  padding: 14px 16px;
}

.video-info h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 8px;
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.video-meta {
  display: flex;
  gap: 14px;
  font-size: 0.82rem;
  color: var(--text-muted);
}

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

.video-tags {
  display: flex;
  gap: 6px;
  margin-top: 8px;
  flex-wrap: wrap;
}

.video-tags span {
  background: rgba(255,45,120,0.08);
  color: var(--primary);
  padding: 2px 10px;
  border-radius: 50px;
  font-size: 0.75rem;
}

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

.expert-card {
  background: #fff;
  border-radius: var(--radius);
  padding: 28px 20px;
  text-align: center;
  box-shadow: var(--shadow);
  transition: var(--transition);
}

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

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

.expert-card h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 4px;
}

.expert-card .role {
  color: var(--primary);
  font-size: 0.88rem;
  margin-bottom: 10px;
}

.expert-card .desc {
  font-size: 0.88rem;
  color: var(--text-light);
  margin-bottom: 16px;
  line-height: 1.6;
}

.expert-card .awards {
  font-size: 0.82rem;
  color: var(--secondary);
  margin-bottom: 14px;
}

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

.btn {
  display: inline-block;
  padding: 8px 20px;
  border-radius: 50px;
  font-size: 0.88rem;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
  border: none;
  text-align: center;
}

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

.btn-primary:hover {
  opacity: 0.9;
  color: #fff;
}

.btn-outline {
  border: 1px solid var(--primary);
  color: var(--primary);
  background: transparent;
}

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

.btn-lg {
  padding: 12px 32px;
  font-size: 1rem;
}

/* === Brand Logo Wall === */
.brand-wall {
  display: flex;
  flex-wrap: wrap;
  gap: 30px;
  justify-content: center;
  align-items: center;
}

.brand-wall-item {
  background: #fff;
  padding: 16px 28px;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow);
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-light);
  transition: var(--transition);
}

.brand-wall-item:hover {
  box-shadow: var(--shadow-lg);
  color: var(--primary);
}

/* === How-To Section === */
.howto-steps {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 24px;
  counter-reset: step;
}

.howto-step {
  background: #fff;
  border-radius: var(--radius);
  padding: 28px 20px;
  text-align: center;
  box-shadow: var(--shadow);
  position: relative;
  counter-increment: step;
}

.howto-step::before {
  content: counter(step);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  background: var(--gradient);
  color: #fff;
  border-radius: 50%;
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 14px;
}

.howto-step h3 {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.howto-step p {
  font-size: 0.9rem;
  color: var(--text-light);
  line-height: 1.6;
}

/* === About Section === */
.about-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: center;
}

.about-text h2 {
  font-size: 1.8rem;
  font-weight: 700;
  margin-bottom: 16px;
}

.about-text p {
  color: var(--text-light);
  margin-bottom: 14px;
  line-height: 1.8;
}

.about-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-top: 24px;
}

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

.stat-item .num {
  font-size: 1.8rem;
  font-weight: 800;
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stat-item .label {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 4px;
}

.about-img {
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}

/* === Reviews === */
.review-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}

.review-card {
  background: #fff;
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
}

.review-stars {
  color: #FFB800;
  font-size: 0.95rem;
  margin-bottom: 10px;
}

.review-card p {
  font-size: 0.92rem;
  color: var(--text-light);
  line-height: 1.7;
  margin-bottom: 14px;
}

.review-author {
  display: flex;
  align-items: center;
  gap: 10px;
}

.review-author .avatar {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: var(--gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 600;
  font-size: 0.9rem;
}

.review-author .name {
  font-weight: 600;
  font-size: 0.9rem;
}

.review-author .date {
  font-size: 0.8rem;
  color: var(--text-muted);
}

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

.faq-item {
  background: #fff;
  border-radius: var(--radius-sm);
  margin-bottom: 12px;
  box-shadow: var(--shadow);
  overflow: hidden;
}

.faq-question {
  padding: 18px 24px;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: var(--transition);
}

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

.faq-question::after {
  content: '+';
  font-size: 1.3rem;
  font-weight: 300;
  transition: var(--transition);
}

.faq-item.active .faq-question::after {
  content: '-';
}

.faq-answer {
  padding: 0 24px;
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease, padding 0.3s ease;
}

.faq-item.active .faq-answer {
  padding: 0 24px 18px;
  max-height: 500px;
}

.faq-answer p {
  font-size: 0.92rem;
  color: var(--text-light);
  line-height: 1.7;
}

/* === Contact Section === */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 24px;
}

.contact-card {
  background: #fff;
  border-radius: var(--radius);
  padding: 24px;
  text-align: center;
  box-shadow: var(--shadow);
}

.contact-card h3 {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 8px;
}

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

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

/* === AI Section === */
.ai-features {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 24px;
}

.ai-card {
  background: linear-gradient(135deg, #1a1a2e, #2d1b69);
  border-radius: var(--radius);
  padding: 28px;
  color: #fff;
  transition: var(--transition);
}

.ai-card:hover {
  transform: translateY(-4px);
}

.ai-card h3 {
  font-size: 1.1rem;
  margin-bottom: 10px;
}

.ai-card p {
  font-size: 0.9rem;
  opacity: 0.85;
  line-height: 1.7;
}

.ai-card .icon {
  font-size: 2.2rem;
  margin-bottom: 14px;
}

/* === Community Section === */
.community-features {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 20px;
}

.community-item {
  background: #fff;
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
  transition: var(--transition);
  border-left: 4px solid var(--primary);
}

.community-item:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
}

.community-item h3 {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.community-item p {
  font-size: 0.88rem;
  color: var(--text-light);
  line-height: 1.6;
}

/* === Social Share === */
.social-share {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}

.share-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 18px;
  border-radius: 50px;
  font-size: 0.88rem;
  color: #fff;
  transition: var(--transition);
}

.share-btn:hover {
  opacity: 0.85;
  color: #fff;
  transform: translateY(-2px);
}

.share-wechat { background: #07C160; }
.share-weibo { background: #E6162D; }
.share-douyin { background: #111; }
.share-bilibili { background: #00A1D6; }

/* === Footer === */
.site-footer {
  background: var(--darker);
  color: rgba(255,255,255,0.7);
  padding: 50px 0 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}

.footer-brand .logo {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
}

.footer-brand .logo img {
  height: 36px;
}

.footer-brand .logo span {
  color: #fff;
  font-size: 1.2rem;
  font-weight: 700;
}

.footer-brand p {
  font-size: 0.88rem;
  line-height: 1.7;
  margin-bottom: 16px;
}

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

.footer-qrcodes .qr-item {
  text-align: center;
}

.footer-qrcodes .qr-item img {
  width: 100px;
  height: 100px;
  border-radius: 8px;
  margin-bottom: 6px;
}

.footer-qrcodes .qr-item span {
  font-size: 0.78rem;
  display: block;
}

.footer-col h4 {
  color: #fff;
  font-size: 1rem;
  margin-bottom: 16px;
  font-weight: 600;
}

.footer-col ul {
  list-style: none;
}

.footer-col ul li {
  margin-bottom: 8px;
}

.footer-col ul li a {
  color: rgba(255,255,255,0.6);
  font-size: 0.88rem;
  transition: var(--transition);
}

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

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding: 20px 0;
  text-align: center;
  font-size: 0.82rem;
}

.footer-bottom p {
  margin-bottom: 4px;
}

/* === Inner Page === */
.page-hero {
  background: var(--dark);
  padding: 50px 0;
  text-align: center;
  color: #fff;
}

.page-hero h1 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 10px;
}

.page-hero p {
  opacity: 0.8;
  font-size: 1rem;
}

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

.page-content h2 {
  font-size: 1.5rem;
  font-weight: 700;
  margin: 30px 0 16px;
  color: var(--text);
}

.page-content h3 {
  font-size: 1.2rem;
  font-weight: 600;
  margin: 24px 0 12px;
}

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

.content-card {
  background: #fff;
  border-radius: var(--radius);
  padding: 30px;
  box-shadow: var(--shadow);
  margin-bottom: 24px;
}

/* === Lazy Load === */
.lazy {
  opacity: 0;
  transition: opacity 0.5s ease;
}

.lazy.loaded {
  opacity: 1;
}

/* === Responsive === */
@media (max-width: 992px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
  .about-content {
    grid-template-columns: 1fr;
  }
  .hero-content h1 {
    font-size: 2rem;
  }
}

@media (max-width: 768px) {
  .main-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: #fff;
    flex-direction: column;
    padding: 10px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
  }

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

  .menu-toggle {
    display: block;
  }

  .hero-content h1 {
    font-size: 1.6rem;
  }

  .hero-content p {
    font-size: 1rem;
  }

  .section {
    padding: 40px 0;
  }

  .section-title h2 {
    font-size: 1.5rem;
  }

  .video-grid {
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .about-stats {
    grid-template-columns: repeat(3, 1fr);
  }

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

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

  .hero-content h1 {
    font-size: 1.4rem;
  }

  .about-stats {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .footer-qrcodes {
    flex-direction: column;
    align-items: center;
  }
}