/* 红桃视频官网 - 主样式文件 */
:root {
  --primary: #e8192c;
  --primary-dark: #c0111f;
  --primary-light: #ff4d5e;
  --secondary: #1a1a2e;
  --text-dark: #1f2937;
  --text-gray: #6b7280;
  --text-light: #9ca3af;
  --bg-light: #f9fafb;
  --bg-white: #ffffff;
  --border: #e5e7eb;
  --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: 8px;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: 'PingFang SC', 'Microsoft YaHei', '微软雅黑', 'Hiragino Sans GB', sans-serif;
  color: var(--text-dark);
  background: var(--bg-white);
  line-height: 1.7;
  font-size: 15px;
}

a { text-decoration: none; color: inherit; transition: color 0.2s; }
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-light); }

/* ===== HEADER ===== */
.site-header {
  background: var(--bg-white);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: 0 2px 12px rgba(0,0,0,0.06);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  gap: 24px;
}
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 20px;
  font-weight: 700;
  color: var(--primary);
  white-space: nowrap;
  flex-shrink: 0;
}
.logo-icon {
  width: 38px;
  height: 38px;
  background: var(--primary);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.logo-icon svg { width: 22px; height: 22px; fill: #fff; }

.main-nav { display: flex; align-items: center; gap: 4px; }
.main-nav a {
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 500;
  color: var(--text-dark);
  transition: all 0.2s;
  white-space: nowrap;
}
.main-nav a:hover, .main-nav a.active {
  background: #fff0f1;
  color: var(--primary);
}

.header-actions { display: flex; align-items: center; gap: 10px; flex-shrink: 0; }
.btn-download {
  background: var(--primary);
  color: #fff !important;
  padding: 9px 20px;
  border-radius: 20px;
  font-size: 14px;
  font-weight: 600;
  transition: all 0.2s;
  white-space: nowrap;
}
.btn-download:hover { background: var(--primary-dark); transform: translateY(-1px); box-shadow: 0 4px 12px rgba(232,25,44,0.3); }

.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  flex-direction: column;
  gap: 5px;
}
.mobile-menu-btn span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text-dark);
  border-radius: 2px;
  transition: all 0.3s;
}

/* ===== SEARCH BAR ===== */
.search-bar-wrap {
  background: var(--bg-light);
  border-bottom: 1px solid var(--border);
  padding: 10px 0;
}
.search-bar-inner {
  display: flex;
  align-items: center;
  max-width: 600px;
  margin: 0 auto;
  background: var(--bg-white);
  border: 1.5px solid var(--border);
  border-radius: 24px;
  overflow: hidden;
  transition: border-color 0.2s, box-shadow 0.2s;
}
.search-bar-inner:focus-within {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(232,25,44,0.1);
}
.search-bar-inner input {
  flex: 1;
  border: none;
  outline: none;
  padding: 9px 16px;
  font-size: 14px;
  background: transparent;
  color: var(--text-dark);
}
.search-bar-inner button {
  background: var(--primary);
  border: none;
  color: #fff;
  padding: 9px 20px;
  cursor: pointer;
  font-size: 14px;
  font-weight: 500;
  transition: background 0.2s;
}
.search-bar-inner button:hover { background: var(--primary-dark); }

/* ===== HERO BANNER ===== */
.hero {
  position: relative;
  overflow: hidden;
  background: linear-gradient(135deg, #1a0a0d 0%, #3d0a12 50%, #1a0a0d 100%);
  min-height: 520px;
  display: flex;
  align-items: center;
}
.hero-bg {
  position: absolute;
  inset: 0;
  background-image: url('../assets/images/banner.jpg');
  background-size: cover;
  background-position: center;
  opacity: 0.35;
}
.hero-content {
  position: relative;
  z-index: 2;
  max-width: 580px;
  padding: 60px 0;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(232,25,44,0.2);
  border: 1px solid rgba(232,25,44,0.4);
  color: #ff8a94;
  padding: 5px 14px;
  border-radius: 20px;
  font-size: 13px;
  margin-bottom: 20px;
}
.hero h1 {
  font-size: clamp(28px, 4vw, 46px);
  font-weight: 800;
  color: #fff;
  line-height: 1.25;
  margin-bottom: 18px;
}
.hero h1 em { color: var(--primary-light); font-style: normal; }
.hero p {
  font-size: 16px;
  color: rgba(255,255,255,0.75);
  margin-bottom: 32px;
  line-height: 1.8;
}
.hero-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: 28px;
  font-size: 15px;
  font-weight: 600;
  transition: all 0.2s;
}
.btn-primary:hover { background: var(--primary-dark); transform: translateY(-2px); box-shadow: 0 6px 20px rgba(232,25,44,0.4); color: #fff; }
.btn-outline {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: transparent;
  color: #fff;
  padding: 13px 28px;
  border-radius: 28px;
  font-size: 15px;
  font-weight: 600;
  border: 2px solid rgba(255,255,255,0.4);
  transition: all 0.2s;
}
.btn-outline:hover { border-color: #fff; background: rgba(255,255,255,0.1); color: #fff; }

.hero-stats {
  display: flex;
  gap: 36px;
  margin-top: 40px;
  flex-wrap: wrap;
}
.stat-item { text-align: center; }
.stat-num { font-size: 26px; font-weight: 800; color: #fff; }
.stat-label { font-size: 12px; color: rgba(255,255,255,0.6); margin-top: 2px; }

/* ===== SECTION TITLES ===== */
.section-header { text-align: center; margin-bottom: 52px; }
.section-tag {
  display: inline-block;
  background: #fff0f1;
  color: var(--primary);
  padding: 4px 14px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 12px;
}
.section-header h2 {
  font-size: clamp(22px, 3vw, 32px);
  font-weight: 800;
  color: var(--text-dark);
  margin-bottom: 12px;
}
.section-header p {
  font-size: 15px;
  color: var(--text-gray);
  max-width: 560px;
  margin: 0 auto;
}

/* ===== FEATURES GRID ===== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
}
.feature-card {
  background: var(--bg-white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px 28px;
  transition: all 0.3s;
  position: relative;
  overflow: hidden;
}
.feature-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--primary-light));
  transform: scaleX(0);
  transition: transform 0.3s;
}
.feature-card:hover { box-shadow: var(--shadow-hover); transform: translateY(-4px); border-color: transparent; }
.feature-card:hover::before { transform: scaleX(1); }
.feature-icon {
  width: 52px; height: 52px;
  background: #fff0f1;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 18px;
}
.feature-icon svg { width: 26px; height: 26px; fill: var(--primary); }
.feature-card h3 { font-size: 17px; font-weight: 700; margin-bottom: 10px; }
.feature-card p { font-size: 14px; color: var(--text-gray); line-height: 1.7; }
.feature-img { width: 100%; height: 180px; object-fit: cover; border-radius: var(--radius-sm); margin-top: 18px; }

/* ===== SCENARIOS ===== */
.scenarios-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 20px;
}
.scenario-card {
  background: var(--bg-white);
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
  transition: all 0.3s;
}
.scenario-card:hover { box-shadow: var(--shadow-hover); transform: translateY(-4px); }
.scenario-img { width: 100%; height: 150px; object-fit: cover; }
.scenario-body { padding: 16px; }
.scenario-body h3 { font-size: 15px; font-weight: 700; margin-bottom: 6px; }
.scenario-body p { font-size: 13px; color: var(--text-gray); }

/* ===== VIDEO CARDS ===== */
.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 22px;
}
.video-card {
  background: var(--bg-white);
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
  transition: all 0.3s;
  cursor: pointer;
}
.video-card:hover { box-shadow: var(--shadow-hover); transform: translateY(-4px); }
.video-thumb {
  position: relative;
  width: 100%;
  padding-top: 56.25%;
  overflow: hidden;
  background: #1a1a2e;
}
.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(1.06); }
.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: opacity 0.3s;
}
.video-card:hover .video-play-btn { opacity: 1; }
.play-circle {
  width: 54px; height: 54px;
  background: rgba(232,25,44,0.9);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  backdrop-filter: blur(4px);
  transition: transform 0.2s;
}
.video-card:hover .play-circle { transform: scale(1.1); }
.play-circle svg { width: 22px; height: 22px; fill: #fff; margin-left: 3px; }
.video-duration {
  position: absolute;
  bottom: 8px;
  right: 8px;
  background: rgba(0,0,0,0.7);
  color: #fff;
  font-size: 12px;
  padding: 2px 7px;
  border-radius: 4px;
}
.video-body { padding: 14px 16px; }
.video-body h3 { font-size: 14px; font-weight: 600; margin-bottom: 8px; line-height: 1.5; }
.video-meta { display: flex; align-items: center; gap: 12px; font-size: 12px; color: var(--text-light); }
.video-meta span { display: flex; align-items: center; gap: 4px; }
.video-meta svg { width: 13px; height: 13px; fill: currentColor; }

/* ===== TUTORIAL STEPS ===== */
.tutorial-steps { display: flex; flex-direction: column; gap: 28px; }
.tutorial-step {
  display: grid;
  grid-template-columns: 56px 1fr;
  gap: 20px;
  align-items: start;
}
.step-num {
  width: 48px; height: 48px;
  background: var(--primary);
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  font-weight: 800;
  flex-shrink: 0;
}
.step-content h3 { font-size: 16px; font-weight: 700; margin-bottom: 6px; }
.step-content p { font-size: 14px; color: var(--text-gray); }

/* ===== CHANGELOG ===== */
.changelog-list { display: flex; flex-direction: column; gap: 24px; }
.changelog-item {
  background: var(--bg-white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px 28px;
  border-left: 4px solid var(--primary);
}
.changelog-header { display: flex; align-items: center; gap: 14px; margin-bottom: 14px; flex-wrap: wrap; }
.version-badge {
  background: var(--primary);
  color: #fff;
  padding: 3px 12px;
  border-radius: 12px;
  font-size: 13px;
  font-weight: 700;
}
.changelog-date { font-size: 13px; color: var(--text-light); }
.changelog-changes { display: flex; flex-direction: column; gap: 8px; }
.changelog-changes li {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  font-size: 14px;
  color: var(--text-gray);
}
.changelog-changes li::before {
  content: '✓';
  color: var(--primary);
  font-weight: 700;
  flex-shrink: 0;
  margin-top: 1px;
}

/* ===== FAQ ===== */
.faq-list { display: flex; flex-direction: column; gap: 12px; max-width: 800px; margin: 0 auto; }
.faq-item {
  background: var(--bg-white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}
.faq-question {
  width: 100%;
  background: none;
  border: none;
  padding: 18px 22px;
  text-align: left;
  font-size: 15px;
  font-weight: 600;
  color: var(--text-dark);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  transition: background 0.2s;
}
.faq-question:hover { background: #fff0f1; }
.faq-question.active { color: var(--primary); background: #fff0f1; }
.faq-arrow {
  width: 20px; height: 20px;
  border-radius: 50%;
  background: var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: all 0.3s;
}
.faq-question.active .faq-arrow { background: var(--primary); transform: rotate(180deg); }
.faq-arrow svg { width: 12px; height: 12px; fill: #fff; }
.faq-answer {
  display: none;
  padding: 0 22px 18px;
  font-size: 14px;
  color: var(--text-gray);
  line-height: 1.8;
  border-top: 1px solid var(--border);
  padding-top: 14px;
}
.faq-answer.open { display: block; }

/* ===== REVIEWS ===== */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 22px;
}
.review-card {
  background: var(--bg-white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  transition: all 0.3s;
}
.review-card:hover { box-shadow: var(--shadow-hover); transform: translateY(-3px); }
.review-header { display: flex; align-items: center; gap: 12px; margin-bottom: 14px; }
.review-avatar {
  width: 44px; height: 44px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 16px;
  font-weight: 700;
  flex-shrink: 0;
}
.review-info h4 { font-size: 14px; font-weight: 700; }
.review-stars { color: #f59e0b; font-size: 13px; letter-spacing: 1px; }
.review-text { font-size: 14px; color: var(--text-gray); line-height: 1.7; }
.review-date { font-size: 12px; color: var(--text-light); margin-top: 10px; }

/* ===== CONTACT ===== */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 22px;
}
.contact-card {
  background: var(--bg-white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 24px;
  text-align: center;
  transition: all 0.3s;
}
.contact-card:hover { box-shadow: var(--shadow-hover); transform: translateY(-3px); }
.contact-icon {
  width: 56px; height: 56px;
  background: #fff0f1;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
}
.contact-icon svg { width: 26px; height: 26px; fill: var(--primary); }
.contact-card h3 { font-size: 15px; font-weight: 700; margin-bottom: 8px; }
.contact-card p { font-size: 13px; color: var(--text-gray); }

/* ===== FOOTER ===== */
.site-footer {
  background: var(--secondary);
  color: rgba(255,255,255,0.7);
  padding: 52px 0 28px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr repeat(3, 1fr);
  gap: 40px;
  margin-bottom: 40px;
}
.footer-brand .logo { color: #fff; margin-bottom: 14px; }
.footer-brand p { font-size: 13px; line-height: 1.8; }
.footer-col h4 { font-size: 14px; font-weight: 700; color: #fff; margin-bottom: 16px; }
.footer-col ul { display: flex; flex-direction: column; gap: 10px; }
.footer-col ul li a { font-size: 13px; color: rgba(255,255,255,0.6); transition: color 0.2s; }
.footer-col ul li a:hover { color: var(--primary-light); }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-top: 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 13px;
}
.footer-bottom a { color: rgba(255,255,255,0.5); }
.footer-bottom a:hover { color: var(--primary-light); }

/* ===== BREADCRUMB ===== */
.breadcrumb {
  padding: 14px 0;
  font-size: 13px;
  color: var(--text-light);
}
.breadcrumb a { color: var(--text-light); }
.breadcrumb a:hover { color: var(--primary); }
.breadcrumb span { margin: 0 6px; }

/* ===== PAGE HEADER ===== */
.page-hero {
  background: linear-gradient(135deg, #1a0a0d 0%, #3d0a12 100%);
  padding: 52px 0;
  text-align: center;
}
.page-hero h1 { font-size: clamp(24px, 3vw, 36px); font-weight: 800; color: #fff; margin-bottom: 10px; }
.page-hero p { font-size: 15px; color: rgba(255,255,255,0.7); }

/* ===== INNER PAGE CONTENT ===== */
.inner-content { max-width: 860px; margin: 0 auto; }
.inner-content h2 { font-size: 22px; font-weight: 700; margin: 32px 0 14px; color: var(--text-dark); }
.inner-content h3 { font-size: 17px; font-weight: 700; margin: 24px 0 10px; color: var(--text-dark); }
.inner-content p { font-size: 15px; color: var(--text-gray); line-height: 1.9; margin-bottom: 14px; }
.inner-content ul { margin: 14px 0 14px 20px; }
.inner-content ul li { font-size: 14px; color: var(--text-gray); margin-bottom: 8px; list-style: disc; }

/* ===== RESPONSIVE ===== */
@media (max-width: 900px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 768px) {
  .main-nav { display: none; }
  .main-nav.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 64px;
    left: 0; right: 0;
    background: var(--bg-white);
    border-bottom: 1px solid var(--border);
    padding: 12px 20px;
    gap: 4px;
    box-shadow: 0 8px 20px rgba(0,0,0,0.1);
  }
  .mobile-menu-btn { display: flex; }
  .hero-content { max-width: 100%; }
  .footer-grid { grid-template-columns: 1fr; gap: 28px; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .hero-stats { gap: 24px; }
  .section { padding: 48px 0; }
}
@media (max-width: 480px) {
  .hero-btns { flex-direction: column; }
  .btn-primary, .btn-outline { justify-content: center; }
}