/* ===== 全局重置 & 基础 ===== */
* { margin: 0; padding: 0; box-sizing: border-box; font-family: 'Segoe UI', -apple-system, BlinkMacSystemFont, Roboto, Helvetica, Arial, sans-serif; }
:root {
  --primary: #0066FF;
  --primary-dark: #0044CC;
  --primary-light: #E8F0FE;
  --bg-light: #F4F7FC;
  --text-dark: #1A2332;
  --text-gray: #5A6B7C;
  --text-light: #8A9AAD;
  --shadow: 0 10px 40px rgba(0,102,255,0.08);
  --shadow-lg: 0 20px 60px rgba(0,102,255,0.12);
  --radius: 24px;
  --gradient: linear-gradient(135deg, #0066FF 0%, #3B82F6 50%, #60A5FA 100%);
}
html { scroll-behavior: smooth; }
body { background: #FFFFFF; color: var(--text-dark); line-height: 1.6; -webkit-font-smoothing: antialiased; }
a { text-decoration: none; color: inherit; }
ul { list-style: none; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
.text-center { text-align: center; }
.w-full { width: 100%; text-align: center; }

/* ===== 顶部导航 ===== */
header { background: rgba(255,255,255,0.95); backdrop-filter: blur(10px); box-shadow: 0 2px 15px rgba(0,0,0,0.03); position: sticky; top: 0; z-index: 1000; border-bottom: 1px solid #EAF0F6; }
.nav-bar { display: flex; justify-content: space-between; align-items: center; height: 70px; flex-wrap: wrap; }
.logo { font-size: 28px; font-weight: 800; color: var(--primary); letter-spacing: -0.5px; }
.logo span { color: var(--text-dark); }
.nav-links { display: flex; gap: 4px; flex-wrap: wrap; }
.nav-links a { padding: 8px 14px; border-radius: 40px; font-size: 14px; font-weight: 600; color: var(--text-gray); transition: all 0.2s; white-space: nowrap; }
.nav-links a:hover, .nav-links a.active { background: var(--primary); color: #fff; box-shadow: 0 4px 12px rgba(0,102,255,0.3); }
.btn-nav-cta {
  background: var(--gradient);
  color: #fff;
  padding: 10px 24px;
  border-radius: 40px;
  font-weight: 700;
  font-size: 14px;
  box-shadow: 0 6px 18px rgba(0,102,255,0.3);
  transition: all 0.3s;
  white-space: nowrap;
}
.btn-nav-cta:hover { transform: translateY(-2px); box-shadow: 0 10px 24px rgba(0,102,255,0.4); }

/* ===== 页面容器 & 通用 ===== */
.page { padding: 40px 0 60px; }
.section-header { text-align: center; margin-bottom: 48px; }
.section-header h2 {
  font-size: clamp(1.8rem, 3.5vw, 2.6rem);
  font-weight: 800;
  line-height: 1.25;
  background: linear-gradient(135deg, #1A2332 0%, #334155 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.section-header h2::after {
  content: '';
  display: block;
  width: 56px;
  height: 4px;
  background: var(--gradient);
  border-radius: 4px;
  margin: 16px auto 0;
}
.section-sub {
  font-size: 1.05rem;
  color: var(--text-gray);
  max-width: 640px;
  margin: 16px auto 0;
}

.page-header { text-align: center; margin-bottom: 40px; }
.page-header h1 { font-size: clamp(2.2rem, 5vw, 3.5rem); font-weight: 800; line-height: 1.2; }
.page-header h1 .highlight { color: var(--primary); }
.page-header .subhead { font-size: 1.2rem; color: var(--text-gray); max-width: 650px; margin: 15px auto 0; }

/* ===== 通用按钮 ===== */
.btn-primary {
  background: var(--gradient);
  color: #fff;
  padding: 14px 36px;
  border-radius: 60px;
  font-weight: 700;
  font-size: 1rem;
  border: none;
  cursor: pointer;
  transition: all 0.3s;
  display: inline-block;
  box-shadow: 0 8px 24px rgba(0,102,255,0.25);
}
.btn-primary:hover { transform: translateY(-3px); box-shadow: 0 14px 36px rgba(0,102,255,0.38); }
.btn-outline {
  background: transparent;
  border: 2px solid var(--primary);
  color: var(--primary);
  padding: 12px 36px;
  border-radius: 60px;
  font-weight: 700;
  transition: all 0.3s;
  display: inline-block;
}
.btn-outline:hover { background: var(--primary); color: #fff; transform: translateY(-2px); }

/* ===== 卡片网格 ===== */
.grid-3 { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 24px; margin-top: 30px; }
.grid-4 { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 20px; }
.grid-6 { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 24px; }
.card {
  background: #fff;
  padding: 28px;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  border: 1px solid #F0F4FA;
  transition: all 0.3s;
}
.card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); border-color: rgba(0,102,255,0.15); }
.card i { font-size: 2.5rem; color: var(--primary); margin-bottom: 15px; }
.card h3 { font-size: 1.25rem; margin-bottom: 10px; font-weight: 700; }
.card p { color: var(--text-gray); font-size: 0.95rem; }
.badge { background: #E8F0FE; color: var(--primary); padding: 4px 12px; border-radius: 20px; font-size: 0.8rem; font-weight: 600; }

/* ===== HERO 首屏 ===== */
.hero-section {
  background:
    radial-gradient(circle at 10% 20%, rgba(0,102,255,0.08) 0%, transparent 50%),
    radial-gradient(circle at 90% 80%, rgba(96,165,250,0.1) 0%, transparent 50%),
    linear-gradient(180deg, #F8FBFF 0%, #FFFFFF 100%);
  padding: 60px 0 50px;
  position: relative;
  overflow: hidden;
}
.hero { display: flex; align-items: center; gap: 48px; flex-wrap: wrap; }
.hero-text { flex: 1.1; min-width: 320px; }
.promo-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: linear-gradient(90deg, #FFF4E6 0%, #FFE8EA 100%);
  color: #D13400;
  padding: 8px 18px;
  border-radius: 40px;
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 24px;
  border: 1px solid rgba(255,107,53,0.2);
}
.promo-badge strong { color: #D13400; }
.hero-text h1 {
  font-size: clamp(2.4rem, 5.5vw, 3.8rem);
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 14px;
  background: linear-gradient(135deg, #1A2332 0%, #0066FF 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.hero-subtitle {
  font-size: 1.15rem;
  color: var(--text-gray);
  margin-bottom: 28px;
  letter-spacing: 0.5px;
}
.btn-hero {
  padding: 16px 48px;
  font-size: 1.1rem;
}
.btn-hero-2 { margin-top: 8px; }
.hero-stats {
  display: flex;
  gap: 40px;
  margin: 32px 0 24px;
  flex-wrap: wrap;
}
.hero-stats div { font-weight: 600; color: var(--text-gray); font-size: 0.95rem; }
.hero-stats span {
  display: block;
  font-size: 1.85rem;
  font-weight: 800;
  color: var(--primary);
  line-height: 1.1;
  margin-bottom: 4px;
}
.feature-checklist {
  margin: 24px 0 28px;
}
.feature-checklist li {
  padding: 8px 0;
  font-size: 1rem;
  color: var(--text-dark);
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 10px;
}
.feature-checklist li i {
  color: #10B981;
  font-size: 1.1rem;
  flex-shrink: 0;
}

/* Hero Image */
.hero-image { flex: 1; min-width: 300px; }
.hero-img-wrap {
  position: relative;
  width: 100%;
  aspect-ratio: 1;
  max-width: 460px;
  margin: 0 auto;
  background: linear-gradient(135deg, #E6F0FF 0%, #D4E4FF 50%, #BFDBFE 100%);
  border-radius: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 30px 80px rgba(0,102,255,0.18);
}
.hero-img-wrap > i {
  font-size: clamp(7rem, 18vw, 11rem);
  color: var(--primary);
  position: relative;
  z-index: 2;
  filter: drop-shadow(0 10px 30px rgba(0,102,255,0.3));
}
.orb {
  position: absolute;
  border-radius: 50%;
  background: rgba(255,255,255,0.5);
  backdrop-filter: blur(8px);
}
.orb-1 { width: 80px; height: 80px; top: 8%; left: 10%; animation: float 6s ease-in-out infinite; }
.orb-2 { width: 50px; height: 50px; bottom: 18%; right: 12%; animation: float 7s ease-in-out infinite reverse; background: rgba(0,102,255,0.25); }
.orb-3 { width: 30px; height: 30px; top: 30%; right: 8%; animation: float 5s ease-in-out infinite; background: rgba(59,130,246,0.35); }
@keyframes float {
  0%, 100% { transform: translateY(0) translateX(0); }
  50% { transform: translateY(-20px) translateX(10px); }
}

/* ===== 订阅套餐 ===== */
.pricing-section { padding: 50px 0 30px; }
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
  align-items: stretch;
}
.pricing-card {
  background: #fff;
  border-radius: 28px;
  padding: 36px 28px 28px;
  border: 2px solid #EEF2F8;
  transition: all 0.3s;
  display: flex;
  flex-direction: column;
  position: relative;
}
.pricing-card:hover {
  transform: translateY(-6px);
  border-color: rgba(0,102,255,0.3);
  box-shadow: var(--shadow-lg);
}
.pricing-card--featured {
  border-color: var(--primary);
  background: linear-gradient(180deg, #FFFFFF 0%, #F5F9FF 100%);
  box-shadow: 0 20px 60px rgba(0,102,255,0.18);
  transform: scale(1.02);
}
.pricing-card--featured:hover { transform: scale(1.02) translateY(-6px); }
.pricing-hot {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(90deg, #FF6B35, #EF4444);
  color: #fff;
  padding: 5px 18px;
  border-radius: 40px;
  font-size: 0.8rem;
  font-weight: 700;
  box-shadow: 0 6px 16px rgba(239,68,68,0.35);
}
.pricing-tag {
  text-align: center;
  font-weight: 700;
  color: var(--primary);
  font-size: 0.95rem;
  margin-bottom: 16px;
}
.pricing-price {
  text-align: center;
  font-size: 3rem;
  font-weight: 800;
  color: var(--text-dark);
  line-height: 1;
  margin-bottom: 8px;
}
.pricing-price small {
  font-size: 1rem;
  color: var(--text-gray);
  font-weight: 600;
}
.pricing-price small:first-child { vertical-align: top; margin-right: 2px; }
.pricing-origin {
  text-align: center;
  color: #EF4444;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 20px;
}
.pricing-list {
  margin: 8px 0 24px;
  flex: 1;
}
.pricing-list li {
  padding: 8px 0;
  font-size: 0.92rem;
  color: var(--text-dark);
  display: flex;
  align-items: center;
  gap: 10px;
}
.pricing-list li i {
  color: #10B981;
  flex-shrink: 0;
}

/* ===== 游戏加速 ===== */
.gaming-section {
  margin: 60px 0;
  padding: 48px;
  background: linear-gradient(135deg, #0F172A 0%, #1E3A8A 50%, #1E40AF 100%);
  border-radius: 32px;
  color: #fff;
  overflow: hidden;
  position: relative;
}
.gaming-section::before {
  content: '';
  position: absolute;
  top: -50%; right: -20%;
  width: 500px; height: 500px;
  background: radial-gradient(circle, rgba(59,130,246,0.4) 0%, transparent 70%);
  border-radius: 50%;
}
.gaming-inner {
  display: flex;
  align-items: center;
  gap: 40px;
  flex-wrap: wrap;
  position: relative;
  z-index: 1;
}
.gaming-text { flex: 1.2; min-width: 300px; }
.gaming-text h2 {
  font-size: clamp(1.7rem, 3.2vw, 2.4rem);
  font-weight: 800;
  line-height: 1.25;
  margin-bottom: 16px;
}
.gaming-desc {
  color: rgba(255,255,255,0.8);
  font-size: 1rem;
  line-height: 1.8;
  margin-bottom: 24px;
}
.gaming-features {
  display: flex;
  gap: 32px;
  flex-wrap: wrap;
  margin-bottom: 28px;
}
.gaming-features li {
  display: flex;
  align-items: center;
  gap: 10px;
  color: rgba(255,255,255,0.92);
  font-weight: 500;
}
.gaming-features li i { color: #60A5FA; font-size: 1.1rem; }
.gaming-features strong { color: #fff; font-size: 1.1rem; }
.gaming-text .btn-primary {
  background: #fff;
  color: #1E3A8A;
  box-shadow: 0 10px 30px rgba(0,0,0,0.2);
}
.gaming-text .btn-primary:hover { background: #F0F7FF; }

.gaming-visual {
  flex: 1;
  min-width: 280px;
  position: relative;
  height: 260px;
}
.ping-card {
  position: absolute;
  background: rgba(255,255,255,0.12);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255,255,255,0.2);
  border-radius: 20px;
  padding: 18px 24px;
  display: flex;
  align-items: center;
  gap: 12px;
  box-shadow: 0 10px 40px rgba(0,0,0,0.25);
  animation: pingFloat 4s ease-in-out infinite;
}
.ping-card i { font-size: 1.8rem; color: #60A5FA; }
.ping-card span {
  font-size: 1.6rem;
  font-weight: 800;
  color: #10B981;
}
.ping-1 { top: 10%; left: 10%; animation-delay: 0s; }
.ping-2 { top: 45%; right: 15%; animation-delay: 1s; }
.ping-3 { bottom: 10%; left: 25%; animation-delay: 2s; }
@keyframes pingFloat {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-14px); }
}

/* ===== 功能卡片（为什么选择） ===== */
.feature-card {
  text-align: center;
  padding: 32px 24px;
}
.fc-icon {
  width: 72px;
  height: 72px;
  margin: 0 auto 20px;
  background: linear-gradient(135deg, var(--primary-light), #DBEAFE);
  border-radius: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s;
}
.feature-card:hover .fc-icon {
  background: var(--gradient);
  transform: rotate(-5deg) scale(1.05);
}
.feature-card:hover .fc-icon i {
  color: #fff;
}
.fc-icon i {
  font-size: 2rem;
  color: var(--primary);
  transition: all 0.3s;
}
.feature-card h3 { font-size: 1.15rem; margin-bottom: 10px; }
.feature-card p { font-size: 0.9rem; }

/* ===== 用户评价 ===== */
.reviews-section { margin: 60px 0; padding-top: 20px; }
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}
.review-card {
  background: #fff;
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow);
  border: 1px solid #F0F4FA;
  transition: all 0.3s;
  display: flex;
  flex-direction: column;
}
.review-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(0,102,255,0.15);
}
.review-text {
  color: var(--text-dark);
  font-size: 0.95rem;
  line-height: 1.75;
  margin-bottom: 20px;
  flex: 1;
}
.review-text::before {
  content: '"';
  font-size: 3rem;
  color: rgba(0,102,255,0.15);
  font-family: Georgia, serif;
  line-height: 0.3;
  display: inline-block;
  vertical-align: -0.4em;
  margin-right: 4px;
}
.review-user {
  display: flex;
  align-items: center;
  gap: 12px;
  padding-top: 16px;
  border-top: 1px solid #F0F4FA;
}
.avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: linear-gradient(135deg, #0066FF, #3B82F6);
  color: #fff;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  flex-shrink: 0;
}
.avatar-b { background: linear-gradient(135deg, #8B5CF6, #6366F1); }
.avatar-s { background: linear-gradient(135deg, #EC4899, #F43F5E); }
.avatar-m { background: linear-gradient(135deg, #10B981, #14B8A6); }
.avatar-j { background: linear-gradient(135deg, #F59E0B, #EF4444); }
.avatar-e { background: linear-gradient(135deg, #06B6D4, #0EA5E9); }
.avatar-li { background: linear-gradient(135deg, #A855F7, #EC4899); }
.avatar-c { background: linear-gradient(135deg, #EF4444, #F97316); }
.avatar-d { background: linear-gradient(135deg, #0EA5E9, #6366F1); }
.avatar-k { background: linear-gradient(135deg, #64748B, #334155); }
.ru-name {
  font-weight: 700;
  color: var(--text-dark);
  font-size: 0.95rem;
}
.ru-type {
  color: var(--text-light);
  font-size: 0.8rem;
}

/* ===== 新闻资讯 ===== */
.news-section { margin: 60px 0; }
.news-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}
.news-card {
  background: #fff;
  border-radius: var(--radius);
  padding: 24px;
  border: 1px solid #F0F4FA;
  transition: all 0.3s;
  display: flex;
  flex-direction: column;
}
.news-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(0,102,255,0.2);
}
.news-date {
  font-size: 0.8rem;
  color: var(--text-light);
  font-weight: 600;
  margin-bottom: 12px;
  letter-spacing: 0.3px;
}
.news-card h3 {
  font-size: 1.05rem;
  font-weight: 700;
  line-height: 1.5;
  margin-bottom: 12px;
  color: var(--text-dark);
  transition: color 0.3s;
}
.news-card:hover h3 { color: var(--primary); }
.news-card p {
  color: var(--text-gray);
  font-size: 0.88rem;
  line-height: 1.7;
  flex: 1;
  margin-bottom: 16px;
}
.news-more {
  color: var(--primary);
  font-weight: 600;
  font-size: 0.88rem;
  transition: gap 0.2s;
}
.news-card:hover .news-more { letter-spacing: 0.5px; }

/* ===== QuickQ S 企业版 ===== */
.s-section {
  margin: 60px 0 30px;
  padding: 48px;
  background: linear-gradient(135deg, #F0F9FF 0%, #E0F2FE 50%, #F5F3FF 100%);
  border-radius: 32px;
  overflow: hidden;
  position: relative;
}
.s-inner {
  display: flex;
  align-items: center;
  gap: 40px;
  flex-wrap: wrap;
}
.s-text { flex: 1.1; min-width: 300px; }
.s-logo {
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--text-dark);
  margin-bottom: 12px;
}
.s-badge {
  display: inline-block;
  background: linear-gradient(135deg, #0066FF, #6366F1);
  color: #fff;
  padding: 2px 10px;
  border-radius: 8px;
  font-size: 1.1rem;
  margin-left: 4px;
}
.s-text h2 {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 800;
  line-height: 1.3;
  margin-bottom: 16px;
}
.s-desc {
  color: var(--text-gray);
  font-size: 1rem;
  line-height: 1.8;
  margin-bottom: 20px;
}
.s-features {
  margin-bottom: 24px;
}
.s-features li {
  padding: 7px 0;
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text-dark);
}
.s-features li i { color: #10B981; }

.s-visual {
  flex: 1;
  min-width: 300px;
  display: flex;
  justify-content: center;
  align-items: center;
}
.s-orbit {
  width: 320px;
  height: 320px;
  position: relative;
}
.s-center {
  position: absolute;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  width: 90px; height: 90px;
  background: var(--gradient);
  border-radius: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 2.2rem;
  box-shadow: 0 15px 40px rgba(0,102,255,0.4);
  z-index: 2;
}
.s-node {
  position: absolute;
  width: 60px; height: 60px;
  background: #fff;
  border-radius: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
  font-size: 1.5rem;
  box-shadow: 0 8px 24px rgba(0,0,0,0.08);
  animation: nodeFloat 4s ease-in-out infinite;
}
.s-node::before {
  content: '';
  position: absolute;
  top: 50%; left: 50%;
  width: 140%;
  height: 2px;
  background: linear-gradient(90deg, rgba(0,102,255,0.3), transparent);
  transform-origin: left center;
  z-index: -1;
  pointer-events: none;
}
.s-node-1 { top: 5%; left: 50%; transform: translateX(-50%); animation-delay: 0s; }
.s-node-2 { top: 30%; right: 5%; animation-delay: 0.5s; }
.s-node-3 { bottom: 20%; right: 10%; animation-delay: 1s; }
.s-node-4 { bottom: 15%; left: 10%; animation-delay: 1.5s; }
.s-node-5 { top: 28%; left: 5%; animation-delay: 2s; }
@keyframes nodeFloat {
  0%, 100% { transform: translateY(0) translateX(var(--base-x, 0)); }
  50% { transform: translateY(-10px) translateX(var(--base-x, 0)); }
}

/* ===== 下载页新增组件 ===== */
.downloads-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: 20px;
}
.dl-card {
  background: #fff;
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
  border: 1px solid #F0F4FA;
  transition: all 0.3s;
  display: flex;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
}
.dl-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(0,102,255,0.2);
}
.dl-icon {
  width: 72px; height: 72px;
  border-radius: 22px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 2.2rem;
  flex-shrink: 0;
  box-shadow: 0 8px 24px rgba(0,0,0,0.1);
}
.dl-info { flex: 1; min-width: 200px; }
.dl-info h3 { margin-bottom: 4px; font-size: 1.05rem; }
.dl-info h3 .badge { margin-left: 8px; vertical-align: middle; }
.dl-info > p { color: var(--text-gray); font-size: 0.88rem; margin: 2px 0; }
.dl-meta { font-size: 0.8rem; color: var(--text-light); }
.dl-meta i { margin-right: 4px; color: var(--primary); }

/* ===== 3 步安装指引 ===== */
.steps {
  display: flex;
  align-items: stretch;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
}
.step {
  flex: 1;
  min-width: 220px;
  max-width: 300px;
  background: #fff;
  border-radius: var(--radius);
  padding: 28px 22px;
  text-align: center;
  box-shadow: var(--shadow);
  border: 1px solid #F0F4FA;
  transition: all 0.3s;
}
.step:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(0,102,255,0.2);
}
.step-n {
  width: 56px; height: 56px;
  margin: 0 auto 16px;
  border-radius: 50%;
  background: var(--gradient);
  color: #fff;
  font-weight: 800;
  font-size: 1.6rem;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 8px 20px rgba(0,102,255,0.3);
}
.step h3 { font-size: 1.1rem; margin-bottom: 8px; }
.step p { color: var(--text-gray); font-size: 0.9rem; line-height: 1.6; }
.step-arrow {
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
  font-size: 1.5rem;
  font-weight: 700;
  padding: 0 4px;
}

/* ===== 教程卡片 ===== */
.tutorial-card { display: block; text-decoration: none; cursor: pointer; }
.tutorial-card:hover { text-decoration: none; }
.tutorial-card .news-more { display: inline-block; margin-top: 10px; }

/* ===== 下载页原有样式保留 ===== */
.download-card { background: #fff; border-radius: 32px; padding: 30px; box-shadow: var(--shadow); border: 1px solid #EAF0F6; display: flex; align-items: center; gap: 25px; flex-wrap: wrap; transition: 0.3s; margin-bottom: 20px; }
.download-card:hover { border-color: var(--primary); }
.download-card .icon-box { width: 70px; height: 70px; background: #F0F7FF; border-radius: 20px; display: flex; align-items: center; justify-content: center; font-size: 2.5rem; color: var(--primary); }
.download-card .info { flex: 1; }
.download-card .info h3 { margin-bottom: 5px; }
.download-card .info p { color: var(--text-gray); font-size: 0.9rem; }
.btn-download { background: var(--primary); color: #fff; padding: 12px 30px; border-radius: 60px; font-weight: 600; transition: 0.3s; display: inline-block; }
.btn-download:hover { background: var(--primary-dark); }

/* ===== 帮助中心 FAQ ===== */
.faq-item { border-bottom: 1px solid #EAF0F6; padding: 18px 0; cursor: pointer; }
.faq-item .q { font-weight: 700; display: flex; justify-content: space-between; }
.faq-item .q i { transition: 0.3s; }
.faq-item .a { max-height: 0; overflow: hidden; transition: 0.4s; color: var(--text-gray); }
.faq-item.open .a { max-height: 200px; padding-top: 10px; }
.faq-item.open .q i { transform: rotate(180deg); }

/* ===== 底部 ===== */
footer { background: #0B132B; color: #A1B0CC; padding: 50px 0 30px; margin-top: 60px; }
footer .footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1.2fr 1fr;
  gap: 40px;
  margin-bottom: 36px;
}
footer h4 { color: #fff; margin-bottom: 18px; font-size: 1rem; }
footer a { display: block; margin-bottom: 10px; font-size: 0.9rem; transition: color 0.2s; }
footer a:hover { color: #fff; }
footer a i { margin-right: 6px; width: 16px; display: inline-block; }
.footer-about p { font-size: 0.9rem; line-height: 1.8; }
.copyright {
  text-align: center;
  padding-top: 24px;
  border-top: 1px solid #1E2A44;
  margin-top: 20px;
  font-size: 0.85rem;
  color: #7888A3;
}
.copyright a { display: inline; }

/* ===== 响应式 ===== */
@media (max-width: 960px) {
  footer .footer-grid { grid-template-columns: repeat(2, 1fr); }
  .s-section, .gaming-section { padding: 32px 24px; }
  .gaming-visual { height: 220px; }
  .s-orbit { width: 280px; height: 280px; }
}
@media (max-width: 768px) {
  .nav-bar { flex-direction: column; height: auto; padding: 12px 0; gap: 12px; }
  .nav-links { justify-content: center; width: 100%; }
  .nav-links a { font-size: 13px; padding: 6px 10px; }
  .btn-nav-cta { width: 100%; text-align: center; }
  .hero-section { padding: 36px 0 30px; }
  .hero { flex-direction: column; text-align: center; }
  .hero-stats { justify-content: center; flex-wrap: wrap; gap: 24px; }
  .feature-checklist li { justify-content: center; text-align: left; }
  .pricing-card--featured { transform: scale(1); }
  .pricing-card--featured:hover { transform: translateY(-6px); }
  footer .footer-grid { grid-template-columns: 1fr 1fr; gap: 24px; }
  .gaming-visual { display: none; }
  .s-orbit { width: 260px; height: 260px; }
}
@media (max-width: 480px) {
  footer .footer-grid { grid-template-columns: 1fr; }
  .hero-stats { flex-direction: column; align-items: center; gap: 16px; }
  .gaming-features { flex-direction: column; gap: 14px; }
  .s-node { width: 50px; height: 50px; font-size: 1.2rem; }
  .s-center { width: 72px; height: 72px; font-size: 1.6rem; }
  .dl-card { flex-direction: column; text-align: center; }
  .dl-icon { width: 64px; height: 64px; font-size: 1.8rem; }
  .step-arrow { transform: rotate(90deg); width: 100%; padding: 4px 0; }
}