/* 91网 - 主样式文件 */
/* ===== 全局重置与基础样式 ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
  color: #333;
  background: #fff;
  line-height: 1.7;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; height: auto; display: block; }
ul { list-style: none; }

/* ===== CSS变量 ===== */
:root {
  --primary: #e8192c;
  --primary-dark: #c0111f;
  --primary-light: #ff4d5e;
  --secondary: #1a1a2e;
  --accent: #ff6b35;
  --bg-light: #f8f9fa;
  --bg-dark: #1a1a2e;
  --text-main: #222;
  --text-muted: #666;
  --border: #e5e5e5;
  --shadow: 0 4px 20px rgba(0,0,0,0.08);
  --shadow-hover: 0 8px 30px rgba(232,25,44,0.15);
  --radius: 12px;
  --radius-sm: 6px;
  --transition: all 0.3s ease;
}

/* ===== 容器 ===== */
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
.section { padding: 70px 0; }
.section-alt { background: var(--bg-light); }

/* ===== 标题 ===== */
.section-title {
  font-size: 2rem;
  font-weight: 700;
  color: var(--text-main);
  text-align: center;
  margin-bottom: 12px;
}
.section-subtitle {
  text-align: center;
  color: var(--text-muted);
  font-size: 1rem;
  margin-bottom: 48px;
}
.section-title span { color: var(--primary); }

/* ===== 导航栏 ===== */
.navbar {
  background: var(--secondary);
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: 0 2px 10px rgba(0,0,0,0.3);
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  gap: 20px;
}
.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}
.nav-logo-icon {
  width: 40px;
  height: 40px;
  background: var(--primary);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  font-weight: 900;
  color: #fff;
}
.nav-logo-text {
  font-size: 1.3rem;
  font-weight: 800;
  color: #fff;
}
.nav-logo-text span { color: var(--primary); }
.nav-menu {
  display: flex;
  align-items: center;
  gap: 4px;
}
.nav-menu a {
  color: rgba(255,255,255,0.85);
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  font-size: 0.92rem;
  transition: var(--transition);
  white-space: nowrap;
}
.nav-menu a:hover, .nav-menu a.active {
  color: #fff;
  background: var(--primary);
}
.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  flex-direction: column;
  gap: 5px;
  padding: 4px;
}
.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: #fff;
  border-radius: 2px;
  transition: var(--transition);
}

/* ===== 搜索框 ===== */
.search-bar {
  background: #16213e;
  padding: 14px 0;
  border-bottom: 1px solid rgba(255,255,255,0.05);
}
.search-inner {
  display: flex;
  align-items: center;
  gap: 10px;
  max-width: 700px;
  margin: 0 auto;
}
.search-input {
  flex: 1;
  height: 44px;
  border: 2px solid rgba(255,255,255,0.15);
  background: rgba(255,255,255,0.08);
  border-radius: 22px;
  padding: 0 20px;
  color: #fff;
  font-size: 0.95rem;
  outline: none;
  transition: var(--transition);
}
.search-input::placeholder { color: rgba(255,255,255,0.4); }
.search-input:focus { border-color: var(--primary); background: rgba(255,255,255,0.12); }
.search-btn {
  height: 44px;
  padding: 0 24px;
  background: var(--primary);
  color: #fff;
  border: none;
  border-radius: 22px;
  font-size: 0.95rem;
  cursor: pointer;
  transition: var(--transition);
  white-space: nowrap;
}
.search-btn:hover { background: var(--primary-dark); transform: translateY(-1px); }

/* ===== Banner ===== */
.banner {
  background: linear-gradient(135deg, #0f0c29 0%, #302b63 50%, #24243e 100%);
  padding: 80px 0 60px;
  position: relative;
  overflow: hidden;
}
.banner::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -10%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(232,25,44,0.15) 0%, transparent 70%);
  pointer-events: none;
}
.banner-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}
.banner-tag {
  display: inline-block;
  background: rgba(232,25,44,0.2);
  color: var(--primary-light);
  border: 1px solid rgba(232,25,44,0.4);
  padding: 4px 14px;
  border-radius: 20px;
  font-size: 0.82rem;
  margin-bottom: 16px;
}
.banner-title {
  font-size: 2.6rem;
  font-weight: 800;
  color: #fff;
  line-height: 1.3;
  margin-bottom: 16px;
}
.banner-title span { color: var(--primary); }
.banner-desc {
  color: rgba(255,255,255,0.75);
  font-size: 1.05rem;
  margin-bottom: 32px;
  line-height: 1.8;
}
.banner-stats {
  display: flex;
  gap: 32px;
  margin-bottom: 32px;
}
.stat-item { text-align: center; }
.stat-num {
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--primary);
  display: block;
}
.stat-label { color: rgba(255,255,255,0.6); font-size: 0.82rem; }
.banner-btns { display: flex; gap: 14px; flex-wrap: wrap; }
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--primary);
  color: #fff;
  padding: 13px 28px;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 600;
  transition: var(--transition);
  border: 2px solid var(--primary);
}
.btn-primary:hover { background: var(--primary-dark); transform: translateY(-2px); box-shadow: 0 6px 20px rgba(232,25,44,0.4); }
.btn-outline {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: transparent;
  color: #fff;
  padding: 13px 28px;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 600;
  border: 2px solid rgba(255,255,255,0.4);
  transition: var(--transition);
}
.btn-outline:hover { border-color: #fff; background: rgba(255,255,255,0.1); }
.banner-img-wrap {
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 20px 60px rgba(0,0,0,0.5);
}
.banner-img-wrap img { width: 100%; border-radius: var(--radius); }
.banner-badge {
  position: absolute;
  bottom: 16px;
  left: 16px;
  background: rgba(0,0,0,0.75);
  backdrop-filter: blur(8px);
  color: #fff;
  padding: 8px 14px;
  border-radius: 8px;
  font-size: 0.82rem;
  display: flex;
  align-items: center;
  gap: 6px;
}
.badge-dot { width: 8px; height: 8px; background: #22c55e; border-radius: 50%; animation: pulse 1.5s infinite; }
@keyframes pulse { 0%,100%{opacity:1;transform:scale(1)} 50%{opacity:0.5;transform:scale(1.3)} }

/* ===== 视频卡片 ===== */
.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 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(-6px); box-shadow: var(--shadow-hover); }
.video-thumb {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16/9;
}
.video-thumb img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.4s ease; }
.video-card:hover .video-thumb img { transform: scale(1.06); }
.video-play-btn {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0,0,0,0.3);
  opacity: 0;
  transition: var(--transition);
}
.video-card:hover .video-play-btn { opacity: 1; }
.play-icon {
  width: 56px;
  height: 56px;
  background: rgba(232,25,44,0.9);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transform: scale(0.8);
  transition: var(--transition);
}
.video-card:hover .play-icon { transform: scale(1); }
.play-icon::after {
  content: '';
  border-left: 20px solid #fff;
  border-top: 12px solid transparent;
  border-bottom: 12px solid transparent;
  margin-left: 4px;
}
.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-cat {
  position: absolute;
  top: 8px;
  left: 8px;
  background: var(--primary);
  color: #fff;
  padding: 2px 10px;
  border-radius: 4px;
  font-size: 0.75rem;
}
.video-info { padding: 14px; }
.video-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 10px;
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.video-meta {
  display: flex;
  gap: 14px;
  color: var(--text-muted);
  font-size: 0.8rem;
}
.video-meta span { display: flex; align-items: center; gap: 4px; }

/* ===== 功能卡片 ===== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 24px;
}
.feature-card {
  background: #fff;
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow);
  transition: var(--transition);
  border: 1px solid var(--border);
  position: relative;
  overflow: hidden;
}
.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--primary);
  transform: scaleX(0);
  transition: var(--transition);
}
.feature-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
.feature-card:hover::before { transform: scaleX(1); }
.feature-icon { font-size: 2.2rem; margin-bottom: 14px; }
.feature-tag {
  display: inline-block;
  background: rgba(232,25,44,0.1);
  color: var(--primary);
  padding: 2px 10px;
  border-radius: 12px;
  font-size: 0.75rem;
  margin-bottom: 10px;
}
.feature-title { font-size: 1.1rem; font-weight: 700; margin-bottom: 10px; color: var(--text-main); }
.feature-desc { color: var(--text-muted); font-size: 0.9rem; line-height: 1.7; }
.feature-stats { display: flex; gap: 16px; margin-top: 14px; }
.feature-stats span { font-size: 0.8rem; color: var(--text-muted); }
.feature-stats strong { color: var(--primary); }

/* ===== 使用场景 ===== */
.scenarios-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.scenario-card {
  background: #fff;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: var(--transition);
}
.scenario-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
.scenario-img { aspect-ratio: 4/3; overflow: hidden; }
.scenario-img img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.4s; }
.scenario-card:hover .scenario-img img { transform: scale(1.05); }
.scenario-body { padding: 20px; }
.scenario-title { font-size: 1rem; font-weight: 700; margin-bottom: 8px; }
.scenario-desc { color: var(--text-muted); font-size: 0.88rem; line-height: 1.6; }

/* ===== 教程步骤 ===== */
.tutorial-steps {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 24px;
  position: relative;
}
.tutorial-step {
  text-align: center;
  padding: 28px 20px;
  background: #fff;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  transition: var(--transition);
  position: relative;
}
.tutorial-step:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
.step-num {
  width: 48px;
  height: 48px;
  background: var(--primary);
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  font-weight: 800;
  margin: 0 auto 14px;
}
.step-icon { font-size: 2rem; margin-bottom: 12px; }
.step-title { font-size: 1rem; font-weight: 700; margin-bottom: 8px; }
.step-desc { color: var(--text-muted); font-size: 0.85rem; line-height: 1.6; }

/* ===== 更新日志 ===== */
.changelog-list { max-width: 800px; margin: 0 auto; }
.changelog-item {
  display: flex;
  gap: 20px;
  padding: 24px 0;
  border-bottom: 1px solid var(--border);
}
.changelog-item:last-child { border-bottom: none; }
.changelog-ver {
  flex-shrink: 0;
  text-align: center;
  min-width: 90px;
}
.ver-badge {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 0.82rem;
  font-weight: 700;
  margin-bottom: 6px;
}
.ver-badge.major { background: rgba(232,25,44,0.1); color: var(--primary); }
.ver-badge.minor { background: rgba(59,130,246,0.1); color: #3b82f6; }
.ver-badge.patch { background: rgba(34,197,94,0.1); color: #22c55e; }
.ver-date { font-size: 0.78rem; color: var(--text-muted); }
.changelog-content { flex: 1; }
.changelog-title { font-size: 1rem; font-weight: 700; margin-bottom: 10px; }
.changelog-changes { padding-left: 16px; }
.changelog-changes li { color: var(--text-muted); font-size: 0.88rem; margin-bottom: 4px; list-style: disc; }

/* ===== FAQ ===== */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item {
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  margin-bottom: 12px;
  overflow: hidden;
}
.faq-question {
  padding: 18px 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  font-weight: 600;
  font-size: 0.95rem;
  transition: var(--transition);
  background: #fff;
}
.faq-question:hover { background: var(--bg-light); }
.faq-question.active { background: rgba(232,25,44,0.05); color: var(--primary); }
.faq-arrow {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--bg-light);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.7rem;
  flex-shrink: 0;
  transition: var(--transition);
}
.faq-question.active .faq-arrow { background: var(--primary); color: #fff; transform: rotate(180deg); }
.faq-answer {
  padding: 0 20px;
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease, padding 0.3s ease;
  color: var(--text-muted);
  font-size: 0.9rem;
  line-height: 1.8;
}
.faq-answer.open { max-height: 300px; padding: 0 20px 18px; }

/* ===== 用户评价 ===== */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}
.review-card {
  background: #fff;
  border-radius: var(--radius);
  padding: 22px;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
  transition: var(--transition);
}
.review-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-hover); }
.review-header { display: flex; align-items: center; gap: 12px; margin-bottom: 14px; }
.review-avatar {
  width: 44px;
  height: 44px;
  background: var(--primary);
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  font-weight: 700;
  flex-shrink: 0;
}
.review-name { font-weight: 700; font-size: 0.95rem; }
.review-loc { color: var(--text-muted); font-size: 0.78rem; }
.review-stars { color: #f59e0b; font-size: 0.85rem; margin-bottom: 10px; }
.review-text { color: var(--text-muted); font-size: 0.88rem; line-height: 1.7; margin-bottom: 12px; }
.review-footer { display: flex; justify-content: space-between; align-items: center; }
.review-tag {
  background: rgba(232,25,44,0.08);
  color: var(--primary);
  padding: 2px 10px;
  border-radius: 12px;
  font-size: 0.75rem;
}
.review-likes { color: var(--text-muted); font-size: 0.78rem; }

/* ===== 联系我们 ===== */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: start;
}
.contact-info h3 { font-size: 1.4rem; font-weight: 700; margin-bottom: 16px; }
.contact-info p { color: var(--text-muted); margin-bottom: 24px; line-height: 1.8; }
.contact-items { display: flex; flex-direction: column; gap: 14px; }
.contact-item { display: flex; align-items: center; gap: 12px; }
.contact-icon {
  width: 40px;
  height: 40px;
  background: rgba(232,25,44,0.1);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  flex-shrink: 0;
}
.contact-item-text strong { display: block; font-size: 0.88rem; margin-bottom: 2px; }
.contact-item-text span { color: var(--text-muted); font-size: 0.82rem; }
.contact-social { display: flex; gap: 12px; margin-top: 24px; flex-wrap: wrap; }
.social-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 0.85rem;
  transition: var(--transition);
}
.social-btn:hover { border-color: var(--primary); color: var(--primary); }
.contact-form { background: var(--bg-light); border-radius: var(--radius); padding: 28px; }
.contact-form h3 { font-size: 1.2rem; font-weight: 700; margin-bottom: 20px; }
.form-group { margin-bottom: 16px; }
.form-group label { display: block; font-size: 0.88rem; font-weight: 600; margin-bottom: 6px; }
.form-group input, .form-group textarea {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-family: inherit;
  outline: none;
  transition: var(--transition);
  background: #fff;
}
.form-group input:focus, .form-group textarea:focus { border-color: var(--primary); }
.form-group textarea { resize: vertical; min-height: 100px; }
.form-submit {
  width: 100%;
  padding: 12px;
  background: var(--primary);
  color: #fff;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
}
.form-submit:hover { background: var(--primary-dark); }

/* ===== 页脚 ===== */
.footer {
  background: var(--secondary);
  color: rgba(255,255,255,0.75);
  padding: 48px 0 24px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}
.footer-brand .nav-logo { margin-bottom: 14px; }
.footer-brand p { font-size: 0.88rem; line-height: 1.8; margin-bottom: 16px; }
.footer-col h4 { color: #fff; font-size: 1rem; font-weight: 700; margin-bottom: 16px; }
.footer-col ul { display: flex; flex-direction: column; gap: 10px; }
.footer-col ul li a { 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-top: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 0.82rem;
}
.footer-bottom a { transition: var(--transition); }
.footer-bottom a:hover { color: var(--primary); }
.footer-links { display: flex; gap: 16px; }

/* ===== 面包屑 ===== */
.breadcrumb {
  background: var(--bg-light);
  padding: 12px 0;
  border-bottom: 1px solid var(--border);
}
.breadcrumb-inner { display: flex; align-items: center; gap: 8px; font-size: 0.85rem; color: var(--text-muted); }
.breadcrumb-inner a { transition: var(--transition); }
.breadcrumb-inner a:hover { color: var(--primary); }
.breadcrumb-inner span { color: var(--text-main); }
.breadcrumb-sep { color: var(--border); }

/* ===== 内页Hero ===== */
.page-hero {
  background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
  padding: 50px 0;
  text-align: center;
}
.page-hero h1 { font-size: 2rem; font-weight: 800; color: #fff; margin-bottom: 10px; }
.page-hero h1 span { color: var(--primary); }
.page-hero p { color: rgba(255,255,255,0.7); font-size: 1rem; }

/* ===== 通用卡片 ===== */
.card {
  background: #fff;
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
  transition: var(--transition);
}
.card:hover { transform: translateY(-3px); box-shadow: var(--shadow-hover); }
.tag-badge {
  display: inline-block;
  padding: 3px 12px;
  border-radius: 20px;
  font-size: 0.78rem;
  font-weight: 600;
}
.tag-red { background: rgba(232,25,44,0.1); color: var(--primary); }
.tag-blue { background: rgba(59,130,246,0.1); color: #3b82f6; }
.tag-green { background: rgba(34,197,94,0.1); color: #22c55e; }

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
  .banner-inner { grid-template-columns: 1fr; gap: 40px; }
  .banner-img-wrap { max-width: 600px; margin: 0 auto; }
  .scenarios-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
}
@media (max-width: 768px) {
  .section { padding: 50px 0; }
  .section-title { font-size: 1.6rem; }
  .banner-title { font-size: 1.8rem; }
  .banner-stats { gap: 20px; }
  .stat-num { font-size: 1.4rem; }
  .nav-menu { display: none; flex-direction: column; position: absolute; top: 64px; left: 0; right: 0; background: var(--secondary); padding: 16px; gap: 4px; }
  .nav-menu.open { display: flex; }
  .nav-menu a { padding: 10px 16px; }
  .nav-toggle { display: flex; }
  .navbar { position: relative; }
  .scenarios-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .tutorial-steps { grid-template-columns: repeat(2, 1fr); }
  .features-grid { grid-template-columns: 1fr; }
  .video-grid { grid-template-columns: repeat(2, 1fr); }
  .reviews-grid { grid-template-columns: 1fr; }
}
@media (max-width: 480px) {
  .banner-btns { flex-direction: column; }
  .video-grid { grid-template-columns: 1fr; }
  .tutorial-steps { grid-template-columns: 1fr; }
  .banner-stats { flex-wrap: wrap; gap: 16px; }
}