/* ===== 蘑菇视频 主样式 ===== */
:root {
  --pink: #ff2d78;
  --blue: #00c6ff;
  --purple: #7b2ff7;
  --dark: #0a0a1a;
  --dark2: #10102a;
  --card-bg: #13132b;
  --text: #e8eaf6;
  --text-muted: #9fa8da;
  --border: rgba(123,47,247,0.3);
  --gradient: linear-gradient(135deg, #ff2d78 0%, #7b2ff7 50%, #00c6ff 100%);
  --gradient2: linear-gradient(90deg, #ff2d78, #00c6ff);
}

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

html { scroll-behavior: smooth; }

body {
  font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
  background: #f5f7ff;
  color: #1a1a3e;
  line-height: 1.7;
  overflow-x: hidden;
}

/* ===== 导航 ===== */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  background: rgba(10,10,26,0.95);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  padding: 0 5%;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
}

.nav-logo .logo-icon {
  width: 40px; height: 40px;
  background: var(--gradient);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  box-shadow: 0 0 20px rgba(255,45,120,0.5);
}

.nav-logo .logo-text {
  font-size: 20px;
  font-weight: 800;
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: 1px;
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 6px;
  align-items: center;
}

.nav-links a {
  color: #c5cae9;
  text-decoration: none;
  font-size: 14px;
  padding: 6px 14px;
  border-radius: 20px;
  transition: all 0.3s;
  white-space: nowrap;
}

.nav-links a:hover, .nav-links a.active {
  background: var(--gradient);
  color: #fff;
  box-shadow: 0 0 15px rgba(255,45,120,0.4);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  cursor: pointer;
  gap: 5px;
}
.nav-toggle span {
  width: 25px; height: 2px;
  background: var(--blue);
  border-radius: 2px;
  transition: 0.3s;
}

/* ===== 搜索框 ===== */
.search-bar-wrap {
  background: linear-gradient(135deg, #1a1a3e 0%, #0d0d2b 100%);
  padding: 14px 5%;
  margin-top: 64px;
  border-bottom: 1px solid var(--border);
}

.search-bar-inner {
  max-width: 700px;
  margin: 0 auto;
  position: relative;
}

.search-bar-inner input {
  width: 100%;
  padding: 12px 50px 12px 20px;
  border-radius: 30px;
  border: 2px solid var(--border);
  background: rgba(255,255,255,0.05);
  color: #fff;
  font-size: 15px;
  outline: none;
  transition: border 0.3s;
}

.search-bar-inner input:focus {
  border-color: var(--pink);
  box-shadow: 0 0 20px rgba(255,45,120,0.2);
}

.search-bar-inner input::placeholder { color: #7986cb; }

.search-btn {
  position: absolute;
  right: 6px; top: 50%;
  transform: translateY(-50%);
  background: var(--gradient);
  border: none;
  border-radius: 24px;
  color: #fff;
  padding: 7px 20px;
  cursor: pointer;
  font-size: 14px;
  font-weight: 600;
  transition: 0.3s;
}
.search-btn:hover { opacity: 0.85; box-shadow: 0 0 15px rgba(255,45,120,0.5); }

/* ===== Hero Banner ===== */
.hero {
  position: relative;
  min-height: 560px;
  display: flex;
  align-items: center;
  overflow: hidden;
  background: var(--dark);
}

.hero-bg {
  position: absolute;
  inset: 0;
  background-image: url('../images/banner_hero.jpg');
  background-size: cover;
  background-position: center;
  filter: brightness(0.45);
}

.hero-particles {
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 20% 50%, rgba(255,45,120,0.15) 0%, transparent 60%),
              radial-gradient(ellipse at 80% 50%, rgba(0,198,255,0.15) 0%, transparent 60%);
}

.hero-content {
  position: relative;
  z-index: 2;
  padding: 60px 5%;
  max-width: 700px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(255,45,120,0.15);
  border: 1px solid rgba(255,45,120,0.4);
  border-radius: 20px;
  padding: 6px 16px;
  color: var(--pink);
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 20px;
}

.hero h1 {
  font-size: clamp(28px, 5vw, 52px);
  font-weight: 900;
  color: #fff;
  line-height: 1.2;
  margin-bottom: 16px;
}

.hero h1 .brand-highlight {
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero p {
  color: #b0bec5;
  font-size: 16px;
  margin-bottom: 30px;
  max-width: 500px;
}

.hero-btns {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

.btn-primary {
  background: var(--gradient);
  color: #fff;
  border: none;
  padding: 13px 30px;
  border-radius: 30px;
  font-size: 15px;
  font-weight: 700;
  cursor: pointer;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: 0.3s;
  box-shadow: 0 4px 20px rgba(255,45,120,0.4);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 30px rgba(255,45,120,0.5); }

.btn-outline {
  background: transparent;
  color: #fff;
  border: 2px solid rgba(255,255,255,0.4);
  padding: 13px 30px;
  border-radius: 30px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: 0.3s;
}
.btn-outline:hover { border-color: var(--blue); color: var(--blue); }

/* ===== 通用 Section ===== */
.section {
  padding: 70px 5%;
}

.section-light { background: #f5f7ff; }
.section-dark { background: var(--dark2); }
.section-mid { background: #eef0ff; }

.section-header {
  text-align: center;
  margin-bottom: 50px;
}

.section-tag {
  display: inline-block;
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
  margin-bottom: 10px;
}

.section-title {
  font-size: clamp(22px, 4vw, 36px);
  font-weight: 800;
  color: #1a1a3e;
  margin-bottom: 12px;
}

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

.section-sub {
  color: #5c6bc0;
  font-size: 15px;
  max-width: 600px;
  margin: 0 auto;
}
.section-dark .section-sub { color: var(--text-muted); }

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

.video-card {
  background: #fff;
  border-radius: 16px;
  overflow: hidden;
  box-shadow: 0 4px 20px rgba(90,100,200,0.1);
  transition: transform 0.3s, box-shadow 0.3s;
  cursor: pointer;
}

.video-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 12px 40px rgba(123,47,247,0.2);
}

.video-thumb {
  position: relative;
  padding-top: 56.25%;
  overflow: hidden;
  background: #1a1a3e;
}

.video-thumb img {
  position: absolute;
  inset: 0;
  width: 100%; height: 100%;
  object-fit: cover;
  transition: transform 0.4s;
}

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

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

.video-card:hover .video-play-btn {
  background: rgba(0,0,0,0.4);
}

.play-icon {
  width: 56px; height: 56px;
  background: var(--gradient);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transform: scale(0.7);
  transition: opacity 0.3s, transform 0.3s;
  box-shadow: 0 0 30px rgba(255,45,120,0.6);
}

.video-card:hover .play-icon {
  opacity: 1;
  transform: scale(1);
}

.play-icon::after {
  content: '';
  width: 0; height: 0;
  border-style: solid;
  border-width: 10px 0 10px 18px;
  border-color: transparent transparent transparent #fff;
  margin-left: 4px;
}

.video-badge {
  position: absolute;
  top: 10px; left: 10px;
  background: var(--gradient);
  color: #fff;
  font-size: 11px;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: 10px;
}

.video-duration {
  position: absolute;
  bottom: 8px; right: 8px;
  background: rgba(0,0,0,0.75);
  color: #fff;
  font-size: 12px;
  padding: 2px 8px;
  border-radius: 6px;
}

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

.video-title {
  font-size: 15px;
  font-weight: 700;
  color: #1a1a3e;
  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: 12px;
  color: #7986cb;
}

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

/* ===== 社区弹幕 ===== */
.danmu-wrap {
  background: var(--dark);
  border-radius: 16px;
  padding: 20px;
  overflow: hidden;
  height: 200px;
  position: relative;
  margin-bottom: 30px;
  border: 1px solid var(--border);
}

.danmu-row {
  display: flex;
  gap: 20px;
  animation: danmuScroll 18s linear infinite;
  white-space: nowrap;
  margin-bottom: 12px;
}
.danmu-row:nth-child(2) { animation-duration: 22s; animation-delay: -5s; }
.danmu-row:nth-child(3) { animation-duration: 16s; animation-delay: -10s; }
.danmu-row:nth-child(4) { animation-duration: 20s; animation-delay: -8s; }

@keyframes danmuScroll {
  from { transform: translateX(0); }
  to { transform: translateX(-50%); }
}

.danmu-item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: 20px;
  padding: 5px 14px;
  color: #e8eaf6;
  font-size: 13px;
  white-space: nowrap;
}

.danmu-avatar {
  width: 22px; height: 22px;
  border-radius: 50%;
  background: var(--gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  color: #fff;
  flex-shrink: 0;
}

/* ===== 话题卡片 ===== */
.topic-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 16px;
}

.topic-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 18px;
  transition: 0.3s;
  cursor: pointer;
}
.topic-card:hover {
  border-color: var(--pink);
  box-shadow: 0 0 20px rgba(255,45,120,0.15);
  transform: translateY(-3px);
}

.topic-tag {
  font-size: 12px;
  color: var(--blue);
  font-weight: 600;
  margin-bottom: 8px;
}

.topic-title {
  font-size: 15px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 8px;
}

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

/* ===== AI 工具卡片 ===== */
.ai-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 20px;
}

.ai-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 24px;
  text-align: center;
  transition: 0.3s;
  position: relative;
  overflow: hidden;
}

.ai-card::before {
  content: '';
  position: absolute;
  top: -50%; left: -50%;
  width: 200%; height: 200%;
  background: radial-gradient(circle, rgba(123,47,247,0.08) 0%, transparent 60%);
  opacity: 0;
  transition: opacity 0.3s;
}

.ai-card:hover::before { opacity: 1; }
.ai-card:hover {
  border-color: var(--purple);
  transform: translateY(-4px);
  box-shadow: 0 8px 30px rgba(123,47,247,0.2);
}

.ai-icon {
  width: 60px; height: 60px;
  background: var(--gradient);
  border-radius: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 28px;
  margin: 0 auto 16px;
  box-shadow: 0 4px 20px rgba(123,47,247,0.3);
}

.ai-card h3 {
  font-size: 17px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 8px;
}

.ai-card p {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.6;
}

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

.expert-card {
  background: #fff;
  border-radius: 18px;
  padding: 28px 24px;
  text-align: center;
  box-shadow: 0 4px 20px rgba(90,100,200,0.1);
  transition: 0.3s;
}
.expert-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 12px 40px rgba(123,47,247,0.15);
}

.expert-avatar {
  width: 90px; height: 90px;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid transparent;
  background: var(--gradient) border-box;
  margin: 0 auto 16px;
  display: block;
  box-shadow: 0 0 20px rgba(255,45,120,0.3);
}

.expert-name {
  font-size: 18px;
  font-weight: 800;
  color: #1a1a3e;
  margin-bottom: 4px;
}

.expert-title {
  font-size: 13px;
  color: #7986cb;
  margin-bottom: 12px;
}

.expert-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  justify-content: center;
}

.expert-tag {
  background: linear-gradient(135deg, rgba(255,45,120,0.1), rgba(0,198,255,0.1));
  border: 1px solid rgba(123,47,247,0.2);
  color: #5c6bc0;
  font-size: 11px;
  padding: 3px 10px;
  border-radius: 10px;
}

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

.review-card {
  background: #fff;
  border-radius: 16px;
  padding: 24px;
  box-shadow: 0 4px 20px rgba(90,100,200,0.08);
  border-left: 4px solid transparent;
  border-image: var(--gradient) 1;
  transition: 0.3s;
}
.review-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 30px rgba(123,47,247,0.12);
}

.review-stars {
  color: #ffb300;
  font-size: 16px;
  margin-bottom: 10px;
}

.review-text {
  color: #37474f;
  font-size: 14px;
  line-height: 1.7;
  margin-bottom: 16px;
}

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

.review-avatar {
  width: 38px; height: 38px;
  border-radius: 50%;
  background: var(--gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 15px;
  font-weight: 700;
  flex-shrink: 0;
}

.review-name { font-weight: 700; color: #1a1a3e; font-size: 14px; }
.review-date { font-size: 12px; color: #9fa8da; }

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

.faq-item {
  background: #fff;
  border-radius: 12px;
  margin-bottom: 12px;
  box-shadow: 0 2px 12px rgba(90,100,200,0.08);
  overflow: hidden;
}

.faq-q {
  padding: 18px 22px;
  font-size: 15px;
  font-weight: 700;
  color: #1a1a3e;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: 0.3s;
}
.faq-q:hover { color: var(--purple); }

.faq-q .faq-arrow {
  width: 24px; height: 24px;
  background: var(--gradient);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 14px;
  flex-shrink: 0;
  transition: transform 0.3s;
}

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

.faq-a {
  padding: 0 22px;
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, padding 0.3s;
  font-size: 14px;
  color: #546e7a;
  line-height: 1.8;
}

.faq-item.open .faq-a {
  max-height: 300px;
  padding: 0 22px 18px;
}

/* ===== 合作伙伴 ===== */
.partner-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  justify-content: center;
  align-items: center;
}

.partner-logo {
  background: #fff;
  border-radius: 12px;
  padding: 14px 24px;
  font-size: 15px;
  font-weight: 700;
  color: #5c6bc0;
  box-shadow: 0 2px 12px rgba(90,100,200,0.1);
  transition: 0.3s;
  min-width: 120px;
  text-align: center;
}
.partner-logo:hover {
  transform: translateY(-3px);
  box-shadow: 0 6px 20px rgba(123,47,247,0.15);
  color: var(--purple);
}

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

.contact-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 28px 24px;
  text-align: center;
  transition: 0.3s;
}
.contact-card:hover {
  border-color: var(--blue);
  box-shadow: 0 0 20px rgba(0,198,255,0.1);
}

.contact-icon {
  font-size: 36px;
  margin-bottom: 14px;
}

.contact-card h3 {
  font-size: 17px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 8px;
}

.contact-card p {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.7;
}

.qr-placeholder {
  width: 100px; height: 100px;
  background: linear-gradient(135deg, #1a1a3e, #2d2d5e);
  border: 2px dashed var(--border);
  border-radius: 12px;
  margin: 12px auto 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  color: var(--text-muted);
}

/* ===== 统计数字 ===== */
.stats-bar {
  background: var(--dark);
  padding: 30px 5%;
  display: flex;
  justify-content: center;
  gap: 60px;
  flex-wrap: wrap;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

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

.stat-num {
  font-size: 32px;
  font-weight: 900;
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  display: block;
}

.stat-label {
  font-size: 13px;
  color: var(--text-muted);
  margin-top: 4px;
}

/* ===== 页脚 ===== */
.footer {
  background: var(--dark);
  color: var(--text-muted);
  padding: 50px 5% 30px;
  border-top: 1px solid var(--border);
}

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

.footer-brand .logo-text {
  font-size: 22px;
  font-weight: 800;
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  display: block;
  margin-bottom: 12px;
}

.footer-brand p {
  font-size: 13px;
  line-height: 1.8;
  max-width: 280px;
}

.footer-col h4 {
  color: #fff;
  font-size: 15px;
  font-weight: 700;
  margin-bottom: 16px;
}

.footer-col ul { list-style: none; }
.footer-col ul li { margin-bottom: 8px; }
.footer-col ul li a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 13px;
  transition: color 0.3s;
}
.footer-col ul li a:hover { color: var(--blue); }

.footer-bottom {
  border-top: 1px solid var(--border);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 13px;
}

.footer-social {
  display: flex;
  gap: 12px;
}

.social-btn {
  width: 36px; height: 36px;
  background: rgba(255,255,255,0.05);
  border: 1px solid var(--border);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  text-decoration: none;
  font-size: 14px;
  transition: 0.3s;
}
.social-btn:hover {
  background: var(--gradient);
  border-color: transparent;
  color: #fff;
}

/* ===== 内页 Banner ===== */
.inner-hero {
  background: var(--dark);
  padding: 100px 5% 60px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.inner-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at center, rgba(123,47,247,0.2) 0%, transparent 70%);
}

.inner-hero h1 {
  font-size: clamp(26px, 4vw, 42px);
  font-weight: 900;
  color: #fff;
  position: relative;
  z-index: 1;
  margin-bottom: 12px;
}

.inner-hero p {
  color: var(--text-muted);
  font-size: 16px;
  position: relative;
  z-index: 1;
}

/* ===== 面包屑 ===== */
.breadcrumb {
  background: #eef0ff;
  padding: 12px 5%;
  font-size: 13px;
  color: #7986cb;
}

.breadcrumb a { color: #5c6bc0; text-decoration: none; }
.breadcrumb a:hover { color: var(--purple); }
.breadcrumb span { margin: 0 8px; }

/* ===== 滚动动画 ===== */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
  .footer-top { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  .nav-links { display: none; flex-direction: column; position: absolute; top: 64px; left: 0; right: 0; background: rgba(10,10,26,0.98); padding: 20px; gap: 4px; }
  .nav-links.open { display: flex; }
  .nav-toggle { display: flex; }
  .stats-bar { gap: 30px; }
  .footer-top { grid-template-columns: 1fr; gap: 24px; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .hero-btns { flex-direction: column; }
  .hero-content { padding: 40px 5%; }
}

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