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

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  line-height: 1.6;
  color: #333;
  background: #fff;
}

@keyframes spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

@keyframes slideDown {
  from { opacity: 0; transform: translateY(-10px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

/* ========== 导航栏 ========== */
.navbar {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid #e5e5e5;
  padding: 12px 0;
}

.nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 18px;
  font-weight: 700;
  color: #e74c3c;
  text-decoration: none;
}

.nav-brand-icon {
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.nav-links {
  display: flex;
  gap: 30px;
  list-style: none;
  align-items: center;
}

.nav-link {
  text-decoration: none;
  color: #666;
  font-size: 14px;
  font-weight: 500;
  transition: color 0.3s ease;
  position: relative;
}

.nav-link:hover {
  color: #e74c3c;
}

.nav-link.active {
  color: #e74c3c;
}

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: -8px;
  left: 0;
  right: 0;
  height: 2px;
  background: #e74c3c;
  border-radius: 1px;
}

.nav-dl {
  background: #e74c3c;
  color: white;
  padding: 8px 20px;
  border-radius: 6px;
  text-decoration: none;
  font-size: 14px;
  font-weight: 600;
  transition: background 0.3s ease;
  border: none;
  cursor: pointer;
}

.nav-dl:hover {
  background: #c0392b;
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
  }
  .nav-inner {
    padding: 0 15px;
  }
}

/* ========== Hero 区域 ========== */
.hero {
  background: linear-gradient(135deg, #f5f5f5 0%, #fafafa 100%);
  padding: 80px 20px;
  text-align: center;
}

.hero-inner {
  max-width: 900px;
  margin: 0 auto;
}

.hero-eyebrow {
  display: inline-block;
  background: #fff;
  border: 1px solid #e5e5e5;
  padding: 8px 16px;
  border-radius: 20px;
  font-size: 13px;
  color: #e74c3c;
  font-weight: 600;
  margin-bottom: 20px;
}

.hero-h1 {
  font-size: 48px;
  font-weight: 700;
  color: #1a1a1a;
  margin-bottom: 16px;
  line-height: 1.2;
}

.hero-p {
  font-size: 18px;
  color: #666;
  margin-bottom: 30px;
  line-height: 1.6;
}

.hero-btns {
  display: flex;
  gap: 16px;
  justify-content: center;
  margin-bottom: 50px;
  flex-wrap: wrap;
}

.btn {
  padding: 12px 32px;
  border-radius: 8px;
  font-size: 15px;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: all 0.3s ease;
  text-decoration: none;
  display: inline-block;
}

.btn-primary {
  background: #e74c3c;
  color: white;
}

.btn-primary:hover {
  background: #c0392b;
  transform: translateY(-2px);
  box-shadow: 0 8px 16px rgba(231, 76, 60, 0.3);
}

.btn-secondary {
  background: white;
  color: #e74c3c;
  border: 2px solid #e74c3c;
}

.btn-secondary:hover {
  background: #f5f5f5;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 30px;
  margin-top: 60px;
}

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

.stat-num {
  font-size: 32px;
  font-weight: 700;
  color: #e74c3c;
  margin-bottom: 8px;
}

.stat-lbl {
  font-size: 14px;
  color: #999;
}

@media (max-width: 768px) {
  .hero-h1 {
    font-size: 32px;
  }
  .hero-p {
    font-size: 16px;
  }
  .hero-btns {
    flex-direction: column;
  }
  .btn {
    width: 100%;
  }
}

/* ========== 功能特色 ========== */
.sec {
  padding: 80px 20px;
  max-width: 1200px;
  margin: 0 auto;
}

.sec-head {
  text-align: center;
  margin-bottom: 60px;
}

.sec-eyebrow {
  display: inline-block;
  background: #fff3f0;
  color: #e74c3c;
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 600;
  margin-bottom: 16px;
}

.sec-title {
  font-size: 36px;
  font-weight: 700;
  color: #1a1a1a;
  margin-bottom: 12px;
}

.sec-sub {
  font-size: 16px;
  color: #666;
}

.feat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 30px;
  margin-bottom: 60px;
}

.feat-card {
  background: white;
  border: 1px solid #e5e5e5;
  border-radius: 12px;
  padding: 30px;
  text-align: center;
  transition: all 0.3s ease;
}

.feat-card:hover {
  border-color: #e74c3c;
  box-shadow: 0 12px 24px rgba(231, 76, 60, 0.1);
  transform: translateY(-4px);
}

.feat-icon {
  width: 60px;
  height: 60px;
  margin: 0 auto 20px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.feat-name {
  font-size: 18px;
  font-weight: 600;
  color: #1a1a1a;
  margin-bottom: 12px;
}

.feat-desc {
  font-size: 14px;
  color: #666;
  line-height: 1.6;
}

/* 深入介绍行 */
.deep-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
  margin-bottom: 80px;
}

.deep-row.rev {
  grid-template-columns: 1fr 1fr;
}

.deep-row.rev .deep-text {
  order: 2;
}

.deep-row.rev .deep-visual {
  order: 1;
}

.deep-text h3 {
  font-size: 28px;
  font-weight: 700;
  color: #1a1a1a;
  margin-bottom: 16px;
}

.deep-text p {
  font-size: 15px;
  color: #666;
  margin-bottom: 16px;
  line-height: 1.7;
}

.deep-list {
  list-style: none;
  margin: 20px 0;
}

.deep-list li {
  font-size: 14px;
  color: #666;
  padding-left: 28px;
  margin-bottom: 12px;
  position: relative;
}

.deep-list li:before {
  content: '✓';
  position: absolute;
  left: 0;
  color: #e74c3c;
  font-weight: bold;
}

.deep-visual {
  background: linear-gradient(135deg, #f5f5f5 0%, #fafafa 100%);
  border-radius: 12px;
  padding: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 300px;
}

.deep-visual svg {
  width: 100%;
  max-width: 400px;
}

@media (max-width: 768px) {
  .deep-row {
    grid-template-columns: 1fr;
    gap: 30px;
  }
  .deep-row.rev .deep-text {
    order: 1;
  }
  .deep-row.rev .deep-visual {
    order: 2;
  }
}

/* ========== 多平台支持 ========== */
.plat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 24px;
}

.plat-card {
  background: white;
  border: 1px solid #e5e5e5;
  border-radius: 12px;
  padding: 30px;
  text-align: center;
  transition: all 0.3s ease;
}

.plat-card:hover {
  border-color: #e74c3c;
  box-shadow: 0 12px 24px rgba(231, 76, 60, 0.1);
}

.plat-card.featured {
  border-color: #e74c3c;
  background: linear-gradient(135deg, #fff5f3 0%, #fffbf9 100%);
}

.plat-icon {
  width: 50px;
  height: 50px;
  margin: 0 auto 16px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.plat-name {
  font-size: 18px;
  font-weight: 600;
  color: #1a1a1a;
  margin-bottom: 8px;
}

.plat-ver {
  font-size: 12px;
  color: #999;
  margin-bottom: 16px;
}

.plat-req {
  font-size: 13px;
  color: #666;
  margin-bottom: 20px;
  line-height: 1.6;
}

.plat-btn {
  background: #e74c3c;
  color: white;
  padding: 10px 24px;
  border-radius: 6px;
  border: none;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.3s ease;
  width: 100%;
}

.plat-btn:hover {
  background: #c0392b;
}

/* ========== 用户评价 ========== */
.rev-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
}

.rev-card {
  background: white;
  border: 1px solid #e5e5e5;
  border-radius: 12px;
  padding: 24px;
  transition: all 0.3s ease;
}

.rev-card:hover {
  border-color: #e74c3c;
  box-shadow: 0 8px 16px rgba(231, 76, 60, 0.1);
}

.rev-stars {
  display: flex;
  gap: 4px;
  margin-bottom: 12px;
}

.rev-star {
  color: #ffc107;
  font-size: 16px;
}

.rev-text {
  font-size: 14px;
  color: #666;
  margin-bottom: 16px;
  line-height: 1.6;
}

.rev-footer {
  display: flex;
  align-items: center;
  gap: 12px;
  padding-top: 16px;
  border-top: 1px solid #e5e5e5;
}

.rev-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 600;
  font-size: 16px;
}

.rev-avatar.av1 { background: #e74c3c; }
.rev-avatar.av2 { background: #3498db; }
.rev-avatar.av3 { background: #2ecc71; }
.rev-avatar.av4 { background: #f39c12; }
.rev-avatar.av5 { background: #9b59b6; }
.rev-avatar.av6 { background: #1abc9c; }

.rev-info {
  flex: 1;
}

.rev-name {
  font-size: 14px;
  font-weight: 600;
  color: #1a1a1a;
}

.rev-role {
  font-size: 12px;
  color: #999;
}

/* ========== 安全保障 ========== */
.sec-items {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 24px;
  margin-bottom: 60px;
}

.sec-item {
  background: white;
  border: 1px solid #e5e5e5;
  border-radius: 12px;
  padding: 24px;
  text-align: center;
}

.sec-item-icon {
  width: 50px;
  height: 50px;
  margin: 0 auto 16px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.sec-item-title {
  font-size: 16px;
  font-weight: 600;
  color: #1a1a1a;
  margin-bottom: 8px;
}

.sec-item-desc {
  font-size: 13px;
  color: #666;
}

/* 对比表格 */
.cmp-wrap {
  overflow-x: auto;
  margin-top: 40px;
}

.cmp-table {
  width: 100%;
  border-collapse: collapse;
  background: white;
  border: 1px solid #e5e5e5;
  border-radius: 8px;
  overflow: hidden;
}

.cmp-table th,
.cmp-table td {
  padding: 16px;
  text-align: left;
  border-bottom: 1px solid #e5e5e5;
  font-size: 14px;
}

.cmp-table th {
  background: #f5f5f5;
  font-weight: 600;
  color: #1a1a1a;
}

.cmp-table tr:last-child td {
  border-bottom: none;
}

.cmp-hl {
  color: #e74c3c;
  font-weight: 600;
}

.yes {
  color: #2ecc71;
  font-weight: 600;
}

.no {
  color: #999;
}

/* ========== 版本选择 ========== */
.ver-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 30px;
}

.ver-card {
  background: white;
  border: 1px solid #e5e5e5;
  border-radius: 12px;
  padding: 30px;
  text-align: center;
  transition: all 0.3s ease;
  position: relative;
}

.ver-card:hover {
  border-color: #e74c3c;
  box-shadow: 0 12px 24px rgba(231, 76, 60, 0.1);
  transform: translateY(-4px);
}

.ver-card.featured {
  border-color: #e74c3c;
  background: linear-gradient(135deg, #fff5f3 0%, #fffbf9 100%);
  transform: scale(1.05);
}

.ver-badge {
  display: inline-block;
  background: #e74c3c;
  color: white;
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 600;
  margin-bottom: 16px;
}

.ver-name {
  font-size: 22px;
  font-weight: 700;
  color: #1a1a1a;
  margin-bottom: 8px;
}

.ver-price {
  font-size: 28px;
  font-weight: 700;
  color: #e74c3c;
  margin-bottom: 20px;
}

.ver-price-sub {
  font-size: 12px;
  color: #999;
}

.ver-desc {
  font-size: 14px;
  color: #666;
  margin-bottom: 24px;
}

.ver-feats {
  list-style: none;
  margin-bottom: 24px;
  text-align: left;
}

.ver-feat {
  font-size: 13px;
  color: #666;
  padding: 8px 0;
  border-bottom: 1px solid #f0f0f0;
}

.ver-feat:last-child {
  border-bottom: none;
}

.ver-feat:before {
  content: '✓ ';
  color: #e74c3c;
  font-weight: bold;
}

.ver-btn {
  background: #e74c3c;
  color: white;
  padding: 12px 24px;
  border-radius: 6px;
  border: none;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  width: 100%;
  transition: background 0.3s ease;
}

.ver-btn:hover {
  background: #c0392b;
}

/* ========== FAQ ========== */
.faq-list {
  list-style: none;
}

.faq-item {
  background: white;
  border: 1px solid #e5e5e5;
  border-radius: 8px;
  margin-bottom: 16px;
  overflow: hidden;
  transition: all 0.3s ease;
}

.faq-item:hover {
  border-color: #e74c3c;
}

.faq-q {
  padding: 20px;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-weight: 600;
  color: #1a1a1a;
  font-size: 15px;
  user-select: none;
}

.faq-q:hover {
  background: #f9f9f9;
}

.faq-chevron {
  width: 20px;
  height: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.3s ease;
  color: #e74c3c;
}

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

.faq-a {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
}

.faq-item.open .faq-a {
  max-height: 500px;
}

.faq-a-inner {
  padding: 0 20px 20px;
  font-size: 14px;
  color: #666;
  line-height: 1.7;
}

/* ========== CTA Banner ========== */
.cta-banner {
  background: linear-gradient(135deg, #e74c3c 0%, #c0392b 100%);
  color: white;
  padding: 60px 20px;
  text-align: center;
  margin: 80px 0 0;
}

.cta-inner {
  max-width: 800px;
  margin: 0 auto;
}

.cta-h2 {
  font-size: 32px;
  font-weight: 700;
  margin-bottom: 16px;
}

.cta-p {
  font-size: 16px;
  margin-bottom: 30px;
  opacity: 0.95;
}

.cta-btn {
  background: white;
  color: #e74c3c;
  padding: 12px 32px;
  border-radius: 6px;
  border: none;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
}

.cta-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 16px rgba(0, 0, 0, 0.2);
}

/* ========== Footer ========== */
.footer {
  background: #f5f5f5;
  padding: 40px 20px;
  text-align: center;
  border-top: 1px solid #e5e5e5;
}

.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
}

.footer-text {
  font-size: 13px;
  color: #999;
  line-height: 1.8;
}

.footer-text a {
  color: #e74c3c;
  text-decoration: none;
}

.footer-text a:hover {
  text-decoration: underline;
}

/* ========== 响应式 ========== */
@media (max-width: 768px) {
  .sec {
    padding: 50px 20px;
  }

  .sec-title {
    font-size: 26px;
  }

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

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

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

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

  .ver-card.featured {
    transform: scale(1);
  }

  .cta-h2 {
    font-size: 24px;
  }

  .cmp-table {
    font-size: 12px;
  }

  .cmp-table th,
  .cmp-table td {
    padding: 12px;
  }
}

@media (max-width: 480px) {
  .hero-h1 {
    font-size: 24px;
  }

  .hero-p {
    font-size: 14px;
  }

  .sec-title {
    font-size: 20px;
  }

  .hero-stats {
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
  }

  .stat-num {
    font-size: 24px;
  }

  .nav-links {
    display: none;
  }
}