/* ========================================
   红桃视频 - 主样式文件
   ======================================== */

:root {
  --primary: #e8193c;
  --primary-dark: #c0102d;
  --primary-light: #ff4d6d;
  --secondary: #1a1a2e;
  --accent: #ff6b6b;
  --text-dark: #1a1a2e;
  --text-gray: #555;
  --text-light: #888;
  --bg-light: #fff9f9;
  --bg-section: #f8f8f8;
  --border: #eee;
  --shadow: 0 4px 20px rgba(232,25,60,0.08);
  --shadow-hover: 0 8px 32px rgba(232,25,60,0.18);
  --radius: 12px;
  --radius-sm: 8px;
  --transition: 0.3s ease;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  color: var(--text-dark);
  background: #fff;
  line-height: 1.7;
  font-size: 15px;
}

a { color: inherit; text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--primary); }
img { max-width: 100%; height: auto; display: block; }
ul { list-style: none; }

.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
.section { padding: 72px 0; }
.section-alt { background: var(--bg-section); }

/* ---- 按钮 ---- */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 28px; border-radius: 50px; font-size: 15px;
  font-weight: 600; cursor: pointer; border: none; transition: all var(--transition);
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); color: #fff; transform: translateY(-2px); box-shadow: 0 6px 20px rgba(232,25,60,0.35); }
.btn-outline { background: transparent; color: var(--primary); border: 2px solid var(--primary); }
.btn-outline:hover { background: var(--primary); color: #fff; transform: translateY(-2px); }
.btn-lg { padding: 16px 40px; font-size: 17px; }

/* ---- 标题 ---- */
.section-title { text-align: center; margin-bottom: 48px; }
.section-title h2 { font-size: 32px; font-weight: 700; color: var(--text-dark); margin-bottom: 12px; }
.section-title p { color: var(--text-gray); font-size: 16px; max-width: 560px; margin: 0 auto; }
.section-title .line {
  width: 48px; height: 4px; background: var(--primary);
  border-radius: 2px; margin: 16px auto 0;
}

/* ========================================
   顶部导航
   ======================================== */
.header {
  position: sticky; top: 0; z-index: 1000;
  background: rgba(255,255,255,0.97);
  backdrop-filter: blur(10px);
  box-shadow: 0 2px 16px rgba(0,0,0,0.06);
}
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 68px;
}
.logo { display: flex; align-items: center; gap: 10px; }
.logo-icon {
  width: 40px; height: 40px; background: var(--primary);
  border-radius: 10px; display: flex; align-items: center; justify-content: center;
  color: #fff; font-size: 20px; font-weight: 900;
}
.logo-text { font-size: 20px; font-weight: 800; color: var(--text-dark); }
.logo-text span { color: var(--primary); }

.nav { display: flex; align-items: center; gap: 4px; }
.nav a {
  padding: 8px 16px; border-radius: 8px; font-size: 14px;
  font-weight: 500; color: var(--text-dark); transition: all var(--transition);
}
.nav a:hover, .nav a.active { color: var(--primary); background: rgba(232,25,60,0.06); }

.header-actions { display: flex; align-items: center; gap: 12px; }
.header-actions .btn { padding: 9px 22px; font-size: 14px; }

.hamburger { display: none; flex-direction: column; gap: 5px; cursor: pointer; }
.hamburger span { width: 24px; height: 2px; background: var(--text-dark); border-radius: 2px; transition: all var(--transition); }

/* ---- 搜索栏 ---- */
.search-bar-wrap {
  background: var(--bg-section);
  border-bottom: 1px solid var(--border);
  padding: 10px 0;
}
.search-bar-inner {
  display: flex; align-items: center; gap: 10px;
  max-width: 600px; margin: 0 auto;
}
.search-bar-inner input {
  flex: 1; padding: 10px 18px; border: 2px solid var(--border);
  border-radius: 50px; font-size: 14px; outline: none;
  transition: border-color var(--transition);
  background: #fff;
}
.search-bar-inner input:focus { border-color: var(--primary); }
.search-bar-inner button {
  padding: 10px 24px; background: var(--primary); color: #fff;
  border: none; border-radius: 50px; font-size: 14px; cursor: pointer;
  font-weight: 600; transition: background var(--transition);
}
.search-bar-inner button:hover { background: var(--primary-dark); }

/* ========================================
   Hero Banner
   ======================================== */
.hero {
  position: relative; overflow: hidden;
  background: linear-gradient(135deg, #1a1a2e 0%, #2d0a14 50%, #1a1a2e 100%);
  min-height: 580px; display: flex; align-items: center;
}
.hero-bg {
  position: absolute; inset: 0;
  background-image: url('../images/hero-banner.jpg');
  background-size: cover; background-position: center;
  opacity: 0.25;
}
.hero-overlay {
  position: absolute; inset: 0;
  background: linear-gradient(135deg, rgba(26,26,46,0.85) 0%, rgba(45,10,20,0.7) 100%);
}
.hero-content {
  position: relative; z-index: 2;
  display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center;
}
.hero-text { color: #fff; }
.hero-badge {
  display: inline-flex; align-items: center; gap: 6px;
  background: rgba(232,25,60,0.2); border: 1px solid rgba(232,25,60,0.4);
  color: #ff8fa3; padding: 6px 14px; border-radius: 50px;
  font-size: 13px; font-weight: 600; margin-bottom: 20px;
}
.hero-text h1 {
  font-size: 46px; font-weight: 900; line-height: 1.2;
  margin-bottom: 16px; color: #fff;
}
.hero-text h1 span { color: var(--primary-light); }
.hero-text p {
  font-size: 17px; color: rgba(255,255,255,0.75);
  margin-bottom: 32px; line-height: 1.8;
}
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; }
.hero-stats {
  display: flex; gap: 32px; margin-top: 40px;
  padding-top: 32px; border-top: 1px solid rgba(255,255,255,0.1);
}
.hero-stat-item { text-align: center; }
.hero-stat-item .num { font-size: 28px; font-weight: 800; color: var(--primary-light); }
.hero-stat-item .label { font-size: 13px; color: rgba(255,255,255,0.6); }

.hero-visual { position: relative; }
.hero-card {
  background: rgba(255,255,255,0.08);
  backdrop-filter: blur(12px);
  border: 1px solid rgba(255,255,255,0.15);
  border-radius: 20px; overflow: hidden;
  box-shadow: 0 20px 60px rgba(0,0,0,0.4);
}
.hero-card-img { position: relative; }
.hero-card-img img { width: 100%; height: 240px; object-fit: cover; }
.hero-play-btn {
  position: absolute; top: 50%; left: 50%; transform: translate(-50%,-50%);
  width: 64px; height: 64px; background: rgba(232,25,60,0.9);
  border-radius: 50%; display: flex; align-items: center; justify-content: center;
  cursor: pointer; transition: all var(--transition);
  box-shadow: 0 4px 20px rgba(232,25,60,0.5);
}
.hero-play-btn:hover { transform: translate(-50%,-50%) scale(1.1); background: var(--primary); }
.hero-play-btn svg { width: 24px; height: 24px; fill: #fff; margin-left: 4px; }
.hero-card-info { padding: 16px 20px; color: #fff; }
.hero-card-info h3 { font-size: 15px; font-weight: 700; margin-bottom: 6px; }
.hero-card-meta { display: flex; gap: 16px; font-size: 12px; color: rgba(255,255,255,0.6); }

/* ========================================
   视频卡片区
   ======================================== */
.video-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}
.video-card {
  background: #fff; border-radius: var(--radius);
  box-shadow: var(--shadow); overflow: hidden;
  transition: all var(--transition); cursor: pointer;
}
.video-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-hover); }
.video-thumb {
  position: relative; overflow: hidden;
  padding-top: 56.25%; /* 16:9 */
  background: #f0f0f0;
}
.video-thumb img {
  position: absolute; inset: 0; width: 100%; height: 100%;
  object-fit: cover; transition: transform var(--transition);
}
.video-card:hover .video-thumb img { transform: scale(1.05); }
.video-play-overlay {
  position: absolute; inset: 0;
  background: rgba(0,0,0,0); display: flex;
  align-items: center; justify-content: center;
  transition: background var(--transition);
}
.video-card:hover .video-play-overlay { background: rgba(0,0,0,0.35); }
.video-play-icon {
  width: 52px; height: 52px; background: rgba(232,25,60,0.9);
  border-radius: 50%; display: flex; align-items: center; justify-content: center;
  opacity: 0; transform: scale(0.8); transition: all var(--transition);
  box-shadow: 0 4px 16px rgba(232,25,60,0.5);
}
.video-card:hover .video-play-icon { opacity: 1; transform: scale(1); }
.video-play-icon svg { width: 20px; height: 20px; fill: #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: 12px;
}
.video-tag {
  position: absolute; top: 8px; left: 8px;
  background: var(--primary); color: #fff;
  padding: 3px 10px; border-radius: 4px; font-size: 11px; font-weight: 600;
}
.video-info { padding: 14px 16px; }
.video-info h3 { font-size: 14px; font-weight: 700; margin-bottom: 8px; line-height: 1.5;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.video-meta { display: flex; align-items: center; justify-content: space-between; font-size: 12px; color: var(--text-light); }
.video-meta-left { display: flex; gap: 12px; }
.video-meta-item { display: flex; align-items: center; gap: 4px; }

/* ========================================
   功能特性
   ======================================== */
.features-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 28px;
}
.feature-card {
  background: #fff; border-radius: var(--radius);
  padding: 32px 28px; box-shadow: var(--shadow);
  transition: all var(--transition); text-align: center;
  border: 1px solid var(--border);
}
.feature-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-hover); border-color: var(--primary); }
.feature-icon {
  width: 64px; height: 64px; background: rgba(232,25,60,0.08);
  border-radius: 16px; display: flex; align-items: center; justify-content: center;
  margin: 0 auto 20px; font-size: 28px; color: var(--primary);
  transition: all var(--transition);
}
.feature-card:hover .feature-icon { background: var(--primary); color: #fff; }
.feature-card h3 { font-size: 17px; font-weight: 700; margin-bottom: 10px; }
.feature-card p { color: var(--text-gray); font-size: 14px; line-height: 1.7; }

/* ========================================
   使用场景
   ======================================== */
.scenarios-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px;
}
.scenario-card {
  border-radius: var(--radius); overflow: hidden;
  position: relative; min-height: 220px;
  box-shadow: var(--shadow); cursor: pointer;
}
.scenario-card img {
  width: 100%; height: 220px; object-fit: cover;
  transition: transform var(--transition);
}
.scenario-card:hover img { transform: scale(1.06); }
.scenario-overlay {
  position: absolute; inset: 0;
  background: linear-gradient(to top, rgba(26,26,46,0.85) 0%, transparent 60%);
  display: flex; align-items: flex-end; padding: 20px;
}
.scenario-text h3 { color: #fff; font-size: 17px; font-weight: 700; margin-bottom: 4px; }
.scenario-text p { color: rgba(255,255,255,0.75); font-size: 13px; }

/* ========================================
   教程模块
   ======================================== */
.tutorial-list { display: flex; flex-direction: column; gap: 20px; }
.tutorial-item {
  display: flex; gap: 20px; align-items: flex-start;
  background: #fff; border-radius: var(--radius);
  padding: 24px; box-shadow: var(--shadow);
  border: 1px solid var(--border); transition: all var(--transition);
}
.tutorial-item:hover { border-color: var(--primary); box-shadow: var(--shadow-hover); }
.tutorial-num {
  width: 40px; height: 40px; background: var(--primary); color: #fff;
  border-radius: 10px; display: flex; align-items: center; justify-content: center;
  font-size: 18px; font-weight: 800; flex-shrink: 0;
}
.tutorial-content h3 { font-size: 16px; font-weight: 700; margin-bottom: 6px; }
.tutorial-content p { color: var(--text-gray); font-size: 14px; }
.tutorial-content .tutorial-tag {
  display: inline-block; background: rgba(232,25,60,0.08); color: var(--primary);
  padding: 3px 10px; border-radius: 4px; font-size: 12px; margin-top: 8px; font-weight: 600;
}

/* ========================================
   更新日志
   ======================================== */
.changelog-list { max-width: 800px; margin: 0 auto; }
.changelog-item {
  display: flex; gap: 24px; margin-bottom: 32px;
  padding-bottom: 32px; border-bottom: 1px solid var(--border);
}
.changelog-item:last-child { border-bottom: none; margin-bottom: 0; }
.changelog-version {
  flex-shrink: 0; text-align: center;
}
.changelog-version .ver {
  background: var(--primary); color: #fff;
  padding: 6px 14px; border-radius: 8px; font-size: 13px; font-weight: 700;
  display: block; margin-bottom: 6px;
}
.changelog-version .date { font-size: 12px; color: var(--text-light); }
.changelog-changes ul { padding-left: 0; }
.changelog-changes li {
  padding: 6px 0 6px 20px; position: relative;
  font-size: 14px; color: var(--text-gray); border-bottom: 1px dashed #f0f0f0;
}
.changelog-changes li:last-child { border-bottom: none; }
.changelog-changes li::before {
  content: "▶"; position: absolute; left: 0;
  color: var(--primary); font-size: 10px; top: 9px;
}

/* ========================================
   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; transition: all var(--transition);
}
.faq-item.active { border-color: var(--primary); }
.faq-question {
  display: flex; align-items: center; justify-content: space-between;
  padding: 18px 22px; cursor: pointer; font-weight: 600; font-size: 15px;
  background: #fff; transition: background var(--transition);
}
.faq-question:hover { background: var(--bg-light); }
.faq-item.active .faq-question { background: rgba(232,25,60,0.04); color: var(--primary); }
.faq-arrow {
  width: 24px; height: 24px; border-radius: 50%;
  background: var(--bg-section); display: flex; align-items: center; justify-content: center;
  transition: transform var(--transition), background var(--transition);
  flex-shrink: 0;
}
.faq-item.active .faq-arrow { transform: rotate(180deg); background: var(--primary); }
.faq-arrow svg { width: 14px; height: 14px; fill: var(--text-gray); }
.faq-item.active .faq-arrow svg { fill: #fff; }
.faq-answer {
  max-height: 0; overflow: hidden; transition: max-height 0.4s ease, padding 0.3s ease;
  padding: 0 22px; color: var(--text-gray); font-size: 14px; line-height: 1.8;
}
.faq-item.active .faq-answer { max-height: 200px; padding: 0 22px 18px; }

/* ========================================
   用户评价
   ======================================== */
.reviews-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 24px;
}
.review-card {
  background: #fff; border-radius: var(--radius);
  padding: 28px; box-shadow: var(--shadow);
  border: 1px solid var(--border); transition: all var(--transition);
}
.review-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
.review-stars { color: #f5a623; font-size: 16px; margin-bottom: 12px; }
.review-text { color: var(--text-gray); font-size: 14px; line-height: 1.8; margin-bottom: 18px; font-style: italic; }
.review-text::before { content: "\201C"; font-size: 32px; color: var(--primary); line-height: 0; vertical-align: -12px; margin-right: 4px; }
.review-author { display: flex; align-items: center; gap: 12px; }
.review-avatar {
  width: 44px; height: 44px; border-radius: 50%;
  background: var(--primary); color: #fff;
  display: flex; align-items: center; justify-content: center;
  font-size: 18px; font-weight: 700; flex-shrink: 0;
}
.review-name { font-weight: 700; font-size: 14px; }
.review-role { font-size: 12px; color: var(--text-light); }

/* ========================================
   联系我们
   ======================================== */
.contact-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: start;
}
.contact-info-list { display: flex; flex-direction: column; gap: 20px; }
.contact-info-item {
  display: flex; gap: 16px; align-items: flex-start;
}
.contact-info-icon {
  width: 48px; height: 48px; background: rgba(232,25,60,0.08);
  border-radius: 12px; display: flex; align-items: center; justify-content: center;
  font-size: 20px; color: var(--primary); flex-shrink: 0;
}
.contact-info-text h4 { font-size: 15px; font-weight: 700; margin-bottom: 4px; }
.contact-info-text p { font-size: 14px; color: var(--text-gray); }
.contact-form { display: flex; flex-direction: column; gap: 16px; }
.form-group { display: flex; flex-direction: column; gap: 6px; }
.form-group label { font-size: 14px; font-weight: 600; }
.form-group input, .form-group textarea {
  padding: 12px 16px; border: 2px solid var(--border);
  border-radius: var(--radius-sm); font-size: 14px; outline: none;
  transition: border-color var(--transition); font-family: inherit;
}
.form-group input:focus, .form-group textarea:focus { border-color: var(--primary); }
.form-group textarea { resize: vertical; min-height: 120px; }

/* ========================================
   页脚
   ======================================== */
.footer {
  background: var(--secondary); color: rgba(255,255,255,0.8);
  padding: 60px 0 0;
}
.footer-grid {
  display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px;
  padding-bottom: 48px; border-bottom: 1px solid rgba(255,255,255,0.1);
}
.footer-brand .logo-text { color: #fff; }
.footer-brand p { margin-top: 14px; font-size: 14px; line-height: 1.8; color: rgba(255,255,255,0.6); }
.footer-col h4 { color: #fff; font-size: 15px; font-weight: 700; margin-bottom: 16px; }
.footer-col ul li { margin-bottom: 10px; }
.footer-col ul li a { font-size: 14px; color: rgba(255,255,255,0.6); transition: color var(--transition); }
.footer-col ul li a:hover { color: var(--primary-light); }
.footer-bottom {
  padding: 20px 0; display: flex; align-items: center;
  justify-content: space-between; flex-wrap: wrap; gap: 12px;
}
.footer-bottom p { font-size: 13px; color: rgba(255,255,255,0.5); }
.footer-domain { color: var(--primary-light); font-weight: 600; }

/* ========================================
   面包屑
   ======================================== */
.breadcrumb {
  padding: 14px 0; font-size: 13px; color: var(--text-light);
  background: var(--bg-section); border-bottom: 1px solid var(--border);
}
.breadcrumb a { color: var(--text-gray); }
.breadcrumb a:hover { color: var(--primary); }
.breadcrumb span { margin: 0 6px; }

/* ========================================
   内页通用
   ======================================== */
.page-hero {
  background: linear-gradient(135deg, var(--secondary) 0%, #2d0a14 100%);
  padding: 60px 0; text-align: center; color: #fff;
}
.page-hero h1 { font-size: 36px; font-weight: 800; margin-bottom: 12px; }
.page-hero p { font-size: 16px; color: rgba(255,255,255,0.75); }

/* ========================================
   响应式
   ======================================== */
@media (max-width: 992px) {
  .hero-content { grid-template-columns: 1fr; }
  .hero-visual { display: none; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .scenarios-grid { grid-template-columns: 1fr 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
}
@media (max-width: 768px) {
  .nav { display: none; }
  .hamburger { display: flex; }
  .hero-text h1 { font-size: 32px; }
  .section { padding: 48px 0; }
  .section-title h2 { font-size: 26px; }
  .footer-grid { grid-template-columns: 1fr; }
  .scenarios-grid { grid-template-columns: 1fr; }
  .hero-stats { gap: 20px; }
  .video-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 480px) {
  .video-grid { grid-template-columns: 1fr; }
  .hero-actions { flex-direction: column; }
  .hero-stats { flex-wrap: wrap; }
}

/* ---- 移动端菜单 ---- */
.mobile-menu {
  display: none; position: fixed; inset: 0; z-index: 2000;
  background: rgba(0,0,0,0.5);
}
.mobile-menu.open { display: block; }
.mobile-menu-inner {
  position: absolute; top: 0; right: 0;
  width: 280px; height: 100%; background: #fff;
  padding: 24px; overflow-y: auto;
  transform: translateX(100%); transition: transform var(--transition);
}
.mobile-menu.open .mobile-menu-inner { transform: translateX(0); }
.mobile-menu-inner a {
  display: block; padding: 14px 0;
  border-bottom: 1px solid var(--border);
  font-size: 15px; font-weight: 500;
}

/* ---- 回到顶部 ---- */
.back-top {
  position: fixed; bottom: 32px; right: 32px; z-index: 999;
  width: 44px; height: 44px; background: var(--primary); color: #fff;
  border-radius: 50%; display: flex; align-items: center; justify-content: center;
  box-shadow: 0 4px 16px rgba(232,25,60,0.4); cursor: pointer;
  opacity: 0; transform: translateY(20px); transition: all var(--transition);
}
.back-top.show { opacity: 1; transform: translateY(0); }
.back-top:hover { background: var(--primary-dark); transform: translateY(-3px); }

/* ---- 标签 ---- */
.tag {
  display: inline-block; padding: 4px 12px; border-radius: 50px;
  font-size: 12px; font-weight: 600; background: rgba(232,25,60,0.08); color: var(--primary);
}

/* ---- 分页 ---- */
.pagination { display: flex; justify-content: center; gap: 8px; margin-top: 40px; }
.pagination a {
  width: 36px; height: 36px; display: flex; align-items: center; justify-content: center;
  border-radius: 8px; border: 1px solid var(--border); font-size: 14px;
  transition: all var(--transition);
}
.pagination a:hover, .pagination a.active { background: var(--primary); color: #fff; border-color: var(--primary); }

/* ---- 下载卡片 ---- */
.download-card {
  background: #fff; border-radius: var(--radius); padding: 28px;
  box-shadow: var(--shadow); border: 1px solid var(--border);
  display: flex; align-items: center; gap: 20px;
  transition: all var(--transition);
}
.download-card:hover { border-color: var(--primary); box-shadow: var(--shadow-hover); }
.download-icon { font-size: 40px; flex-shrink: 0; }
.download-info h3 { font-size: 16px; font-weight: 700; margin-bottom: 4px; }
.download-info p { font-size: 13px; color: var(--text-gray); margin-bottom: 12px; }

/* ---- 帮助卡片 ---- */
.help-card {
  background: #fff; border-radius: var(--radius); padding: 24px;
  box-shadow: var(--shadow); border: 1px solid var(--border);
  transition: all var(--transition);
}
.help-card:hover { border-color: var(--primary); transform: translateY(-4px); }
.help-card h3 { font-size: 16px; font-weight: 700; margin-bottom: 8px; }
.help-card p { font-size: 14px; color: var(--text-gray); }