/* ==========================================================================
   快连82_final - 赛博朋克风格（Cyberpunk Tech）× 黑金奢华配色 × 左图右文不对称布局 × 抽象数据流线
   总骨架色值：主底 #F4F7FC | 间隔区 #EDF1FA | 页脚 #0B1023 | 标题 #1A2238 | 说明 #5A6582 | 主色蓝 #4F6EF7
   黑金奢华点缀：曜石黑 #121726 / #1C2338 | 奢华香槟金 #D4AF37 / #F5D77F / #FFF8E6
   ========================================================================== */

:root {
  --bg-main: #F4F7FC;
  --bg-alt: #EDF1FA;
  --bg-footer: #0B1023;
  --text-heading: #1A2238;
  --text-body: #5A6582;
  --primary-blue: #4F6EF7;
  --primary-hover: #3B5BDB;

  /* 赛博黑金奢华配色系统（避免红蓝霓虹，采用曜石黑与香槟金质感） */
  --cyber-black: #121726;
  --cyber-charcoal: #1E263D;
  --luxury-gold: #D4AF37;
  --luxury-gold-bright: #E6C14A;
  --luxury-gold-soft: #FDF7E2;
  --cyber-teal: #10B981;

  --card-bg: #FFFFFF;
  --card-shadow: 0 10px 28px rgba(26, 34, 56, 0.06);
  --card-shadow-hover: 0 16px 36px rgba(26, 34, 56, 0.12);
  --gold-border: 1px solid rgba(212, 175, 55, 0.36);
  --radius-card: 16px;
  --radius-sm: 12px;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Segoe UI", Roboto, sans-serif;
  background-color: var(--bg-main);
  color: var(--text-body);
  line-height: 1.65;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: inherit;
  text-decoration: none;
  transition: transform 0.22s ease, background-color 0.22s ease, color 0.22s ease;
}

ul {
  list-style: none;
}

/* 总骨架：内容宽 1200px，左右各 24px，桌面居中 */
.container {
  max-width: 1248px;
  padding-left: 24px;
  padding-right: 24px;
  margin-left: auto;
  margin-right: auto;
}

/* 纵向漏斗区块交替背景 */
.section {
  padding: 96px 0;
  background-color: var(--bg-main);
  position: relative;
}

.section-alt {
  padding: 96px 0;
  background-color: var(--bg-alt);
  position: relative;
}

/* 每区标题组居中、最大宽 680px：小标签 + H2（约 38px / 800）+ 一句灰色 lead */
.sec-head {
  max-width: 680px;
  margin: 0 auto 56px;
  text-align: center;
}

/* 赛博黑金机能小标签 */
.sec-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 18px;
  font-size: 13px;
  font-weight: 800;
  color: var(--luxury-gold-bright);
  background: linear-gradient(135deg, var(--cyber-black) 0%, var(--cyber-charcoal) 100%);
  border: 1px solid rgba(212, 175, 55, 0.5);
  border-radius: 999px;
  box-shadow: 0 6px 16px rgba(18, 23, 38, 0.14);
  margin-bottom: 16px;
  letter-spacing: 0.6px;
}

.sec-tag::before {
  content: "";
  width: 8px;
  height: 8px;
  background-color: var(--luxury-gold-bright);
  transform: rotate(45deg);
}

.sec-head h2 {
  font-size: 38px;
  font-weight: 800;
  color: var(--text-heading);
  line-height: 1.25;
  margin-bottom: 14px;
  letter-spacing: -0.5px;
}

.sec-lead {
  font-size: 17px;
  color: var(--text-body);
  line-height: 1.65;
}

/* ==========================================================================
   1. 顶栏：固定吸顶，高约 72px，三栏 flex，半透明浅底 + 毛玻璃 blur
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  height: 72px;
  background-color: rgba(244, 247, 252, 0.96);
  border-bottom: 1px solid rgba(212, 175, 55, 0.14);
}

.header-inner {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand-logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 21px;
  font-weight: 900;
  color: var(--text-heading);
}

.logo-mark {
  width: 38px;
  height: 38px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--cyber-black), var(--cyber-charcoal));
  border: 1.5px solid var(--luxury-gold);
  box-shadow: 0 6px 14px rgba(18, 23, 38, 0.2);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  font-weight: 900;
  color: var(--luxury-gold-bright);
}

.brand-logo span:not(.logo-mark) {
  font-size: 12px;
  font-weight: 800;
  padding: 3px 9px;
  background: var(--cyber-black);
  color: var(--luxury-gold-bright);
  border: 1px solid rgba(212, 175, 55, 0.45);
  border-radius: 6px;
}

.header-nav {
  display: flex;
  align-items: center;
  gap: 32px;
}

.header-nav a {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-body);
  padding: 7px 16px;
  border-radius: 10px;
}

.header-nav a:hover,
.header-nav a.active {
  color: var(--text-heading);
  background-color: #FFFFFF;
  border: 1px solid rgba(212, 175, 55, 0.4);
  box-shadow: 0 4px 12px rgba(18, 23, 38, 0.06);
}

.btn-header-solid {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 24px;
  font-size: 15px;
  font-weight: 800;
  color: #FFFFFF;
  background-color: var(--primary-blue);
  border: 1px solid rgba(212, 175, 55, 0.4);
  border-radius: 12px;
  box-shadow: 0 8px 18px rgba(79, 110, 247, 0.28);
}

.btn-header-solid:hover {
  background-color: var(--primary-hover);
  transform: translateY(-2px);
}

/* 移动端汉堡菜单 */
.nav-toggle-checkbox {
  display: none;
}

.hamburger-btn {
  display: none;
  width: 42px;
  height: 42px;
  border-radius: 10px;
  background: var(--cyber-black);
  border: 1px solid var(--luxury-gold);
  align-items: center;
  justify-content: center;
  cursor: pointer;
}

.hamburger-lines {
  width: 20px;
  height: 2px;
  background: var(--luxury-gold-bright);
  position: relative;
}

.hamburger-lines::before,
.hamburger-lines::after {
  content: "";
  position: absolute;
  left: 0;
  width: 20px;
  height: 2px;
  background: var(--luxury-gold-bright);
}

.hamburger-lines::before { top: -6px; }
.hamburger-lines::after { top: 6px; }

/* ==========================================================================
   2. Hero（约一屏，高约 900px）
   桌面两列 flex，gap 60px，560 / 520 不对称比例 + 淡网点连线 + 核心视觉抽象数据流线
   ========================================================================== */




.hero-section {
  min-height: 890px;
  display: flex;
  align-items: center;
  padding: 72px 0 88px;
  position: relative;
  overflow: hidden;
  /* 很淡的网点 / 连线背景，不要大光斑、不要强网格 */
  background-color: var(--bg-main);
  background-image: radial-gradient(rgba(26, 34, 56, 0.09) 1.25px, transparent 1.25px);
  background-size: 28px 28px;
}

/* 核心视觉：赛博黑金与主色蓝「抽象数据流线」SVG 画布 */
.data-stream-canvas {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
}

.data-stream-svg {
  width: 100%;
  height: 100%;
}

.stream-line {
  fill: none;
  stroke-width: 2;
  stroke-dasharray: 90 230;
}

.stream-line.gold {
  stroke: var(--luxury-gold);
}

.stream-line.blue {
  stroke: var(--primary-blue);
  animation-delay: -2.8s;
}

.stream-line.dark {
  stroke: rgba(18, 23, 38, 0.28);
  stroke-dasharray: 40 160;
  animation-delay: -4.5s;
}

.hero-flex {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 60px;
}

/* 文案列 560px */
.hero-left {
  flex: 0 1 560px;
  max-width: 560px;
}

/* 产品界面 Mockup 列 520px */
.hero-right {
  flex: 0 1 520px;
  max-width: 520px;
  position: relative;
}

/* 眉题胶囊（黑金奢华机能徽章） */
.hero-pill {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 8px 18px;
  background: linear-gradient(135deg, var(--cyber-black) 0%, var(--cyber-charcoal) 100%);
  border: 1px solid var(--luxury-gold);
  border-radius: 999px;
  box-shadow: 0 8px 20px rgba(18, 23, 38, 0.16);
  font-size: 13.5px;
  font-weight: 800;
  color: var(--luxury-gold-bright);
  margin-bottom: 24px;
}

.pill-dot {
  width: 9px;
  height: 9px;
  background-color: var(--luxury-gold-bright);
  transform: rotate(45deg);
  box-shadow: 0 0 8px var(--luxury-gold-bright);
}

/* 超大 H1（约 51px，后半句蓝绿渐变） */
.hero-h1 {
  font-size: 49px;
  font-weight: 900;
  color: var(--text-heading);
  line-height: 1.18;
  letter-spacing: -0.8px;
  margin-bottom: 22px;
}

.gradient-tail {
  background: linear-gradient(92deg, #4F6EF7 0%, #0EA5E9 48%, #10B981 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* 两行卖点 */
.hero-selling-points {
  font-size: 17.5px;
  color: var(--text-body);
  line-height: 1.72;
  margin-bottom: 32px;
  padding-left: 16px;
  border-left: 3px solid var(--luxury-gold);
}

/* 双按钮：实心主按钮「免费下载」+ 浅底描边「了解更多」 */
.hero-buttons {
  display: flex;
  align-items: center;
  gap: 18px;
  margin-bottom: 42px;
  flex-wrap: wrap;
}

.btn-primary-solid {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 16px 32px;
  font-size: 17px;
  font-weight: 800;
  color: #FFFFFF;
  background-color: var(--primary-blue);
  border: 1px solid rgba(212, 175, 55, 0.45);
  border-radius: var(--radius-card);
  box-shadow: 0 10px 24px rgba(79, 110, 247, 0.32);
}

.btn-primary-solid:hover {
  background-color: var(--primary-hover);
  transform: translateY(-2px);
}

.btn-secondary-outline {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 16px 28px;
  font-size: 17px;
  font-weight: 800;
  color: var(--text-heading);
  background-color: #FFFFFF;
  border: 1.5px solid var(--luxury-gold);
  border-radius: var(--radius-card);
  box-shadow: var(--card-shadow);
}

.btn-secondary-outline:hover {
  background-color: var(--cyber-black);
  color: var(--luxury-gold-bright);
  transform: translateY(-2px);
}

/* 一行 3 个数据点 */
.hero-mini-stats {
  display: flex;
  align-items: center;
  gap: 18px;
}

.mini-stat-item {
  flex: 1;
  background: #FFFFFF;
  border: var(--gold-border);
  border-radius: var(--radius-sm);
  padding: 14px 16px;
  box-shadow: var(--card-shadow);
  border-top: 3px solid var(--cyber-black);
}

.mini-stat-item strong {
  display: block;
  font-size: 22px;
  font-weight: 900;
  color: var(--text-heading);
  line-height: 1.2;
}

.mini-stat-item span {
  font-size: 13px;
  font-weight: 700;
  color: var(--text-body);
}

/* 产品界面 Mockup 舞台（赛博黑金机能边框 + 抽象数据流线波纹 + 2 张小能力卡） */
.cyber-mockup-stage {
  position: relative;
  padding: 16px 8px;
}

.cyber-mockup-window {
  background: var(--cyber-black);
  border: 1.5px solid var(--luxury-gold);
  border-radius: 18px;
  padding: 14px;
  box-shadow: 0 24px 48px rgba(18, 23, 38, 0.22);
  position: relative;
  z-index: 2;
}

.cyber-window-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 14px;
  background: rgba(255, 255, 255, 0.05);
  border-bottom: 1px solid rgba(212, 175, 55, 0.28);
  border-radius: 10px 10px 0 0;
  margin-bottom: 12px;
}

.cyber-dots {
  display: flex;
  gap: 7px;
}

.cyber-dots span {
  width: 10px;
  height: 10px;
  border-radius: 2px;
  background: var(--luxury-gold);
}

.cyber-dots span:nth-child(2) { opacity: 0.65; }
.cyber-dots span:nth-child(3) { opacity: 0.35; }

.cyber-stream-status {
  font-size: 12px;
  font-weight: 800;
  color: var(--luxury-gold-bright);
  letter-spacing: 0.5px;
}

.cyber-window-body {
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid rgba(212, 175, 55, 0.25);
}

.cyber-window-body img {
  width: 100%;
  height: auto;
  display: block;
}

/* 抽象数据流线动态指示条 */
.cyber-data-wave {
  margin-top: 12px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 12px;
  background: rgba(212, 175, 55, 0.1);
  border-radius: 8px;
  font-size: 11.5px;
  font-weight: 700;
  color: var(--luxury-gold-bright);
}

/* 旁边浮 2 张黑金小能力卡（极速连接、加密传输） */
.cyber-float-card {
  position: absolute;
  z-index: 3;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 18px;
  background: #FFFFFF;
  border: 1.5px solid var(--luxury-gold);
  border-radius: 14px;
  box-shadow: 0 14px 28px rgba(18, 23, 38, 0.14);
}

.cyber-float-card.pos-top-right {
  top: -12px;
  right: -12px;
}

.cyber-float-card.pos-bottom-left {
  bottom: -14px;
  left: -12px;
  animation-delay: -2.2s;
}

.cyber-float-icon {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background: var(--cyber-black);
  color: var(--luxury-gold-bright);
  border: 1px solid var(--luxury-gold);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
}

.cyber-float-text strong {
  display: block;
  font-size: 14px;
  font-weight: 800;
  color: var(--text-heading);
  line-height: 1.2;
}

.cyber-float-text span {
  font-size: 12px;
  font-weight: 700;
  color: #9A7B1C;
}

/* ==========================================================================
   3. 功能：6 张同构白卡，3 列 × 2 行，gap 28px
   ========================================================================== */
.features-grid-6 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.white-card {
  background-color: var(--card-bg);
  border: var(--gold-border);
  border-radius: var(--radius-card);
  padding: 32px 28px;
  box-shadow: var(--card-shadow);
  transition: transform 0.22s ease;
  position: relative;
}

.white-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--card-shadow-hover);
  border-color: var(--luxury-gold);
}

.card-circle-icon {
  width: 54px;
  height: 54px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--cyber-black), var(--cyber-charcoal));
  color: var(--luxury-gold-bright);
  border: 1.5px solid var(--luxury-gold);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  margin-bottom: 20px;
}

.white-card h3 {
  font-size: 20px;
  font-weight: 800;
  color: var(--text-heading);
  margin-bottom: 10px;
}

.white-card p {
  font-size: 15px;
  color: var(--text-body);
  line-height: 1.65;
}

/* ==========================================================================
   4. 使用流程：浅灰底，3 列横向步骤（下载安装 → 注册登录 → 一键连接）
   ========================================================================== */
.steps-grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.step-card {
  background-color: #FFFFFF;
  border: var(--gold-border);
  border-radius: var(--radius-card);
  padding: 34px 28px;
  text-align: center;
  box-shadow: var(--card-shadow);
}

.step-num-badge {
  width: 56px;
  height: 56px;
  margin: 0 auto 20px;
  border-radius: 50%;
  background: var(--cyber-black);
  color: var(--luxury-gold-bright);
  border: 2px solid var(--luxury-gold);
  box-shadow: 0 8px 18px rgba(18, 23, 38, 0.18);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  font-weight: 900;
}

.step-card h3 {
  font-size: 21px;
  font-weight: 800;
  color: var(--text-heading);
  margin-bottom: 10px;
}

.step-card p {
  font-size: 15px;
  color: var(--text-body);
}

/* ==========================================================================
   5. 平台：4 列平台卡（Windows / macOS / iOS / Android）
   ========================================================================== */
.platforms-grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.platform-card {
  background-color: #FFFFFF;
  border: var(--gold-border);
  border-radius: var(--radius-card);
  padding: 32px 22px;
  text-align: center;
  box-shadow: var(--card-shadow);
  display: flex;
  flex-direction: column;
  align-items: center;
  transition: transform 0.22s ease;
}

.platform-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--card-shadow-hover);
}

.plat-icon-wrap {
  width: 62px;
  height: 62px;
  border-radius: 16px;
  background: var(--cyber-black);
  color: var(--luxury-gold-bright);
  border: 1.5px solid var(--luxury-gold);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 18px;
}

.platform-card h3 {
  font-size: 20px;
  font-weight: 800;
  color: var(--text-heading);
  margin-bottom: 6px;
}

.plat-req {
  font-size: 14px;
  color: var(--text-body);
  margin-bottom: 12px;
}

.plat-ver {
  display: inline-block;
  font-size: 12px;
  font-weight: 800;
  color: #8A6D14;
  background-color: var(--luxury-gold-soft);
  border: 1px solid rgba(212, 175, 55, 0.45);
  padding: 4px 12px;
  border-radius: 999px;
  margin-bottom: 20px;
}

.btn-plat-dl {
  margin-top: auto;
  width: 100%;
  padding: 12px 16px;
  font-size: 14px;
  font-weight: 800;
  color: #FFFFFF;
  background-color: var(--primary-blue);
  border-radius: 12px;
  box-shadow: 0 6px 14px rgba(79, 110, 247, 0.24);
}

.btn-plat-dl:hover {
  background-color: var(--primary-hover);
}

/* ==========================================================================
   6. 用户评价：浅灰底，3 列评价卡（五星 + 引言 + 头像缩写 / 姓名 / 身份）
   ========================================================================== */
.reviews-grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.review-card {
  background-color: #FFFFFF;
  border: var(--gold-border);
  border-radius: var(--radius-card);
  padding: 30px 26px;
  box-shadow: var(--card-shadow);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 22px;
}

.stars-five {
  color: var(--luxury-gold);
  font-size: 18px;
  letter-spacing: 2px;
  margin-bottom: 12px;
}

.review-quote {
  font-size: 15.5px;
  color: var(--text-heading);
  line-height: 1.7;
}

.review-user {
  display: flex;
  align-items: center;
  gap: 12px;
  padding-top: 16px;
  border-top: 1px solid rgba(26, 34, 56, 0.08);
}

.user-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--cyber-black);
  color: var(--luxury-gold-bright);
  border: 1.5px solid var(--luxury-gold);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  font-weight: 800;
}

.user-info strong {
  display: block;
  font-size: 15px;
  font-weight: 800;
  color: var(--text-heading);
}

.user-info span {
  font-size: 13px;
  color: var(--text-body);
}

/* ==========================================================================
   7. 数据条：4 列大数字居中（用户量、节点、在线率、评分）
   ========================================================================== */
.stats-band-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.stat-tile {
  background-color: #FFFFFF;
  border: var(--gold-border);
  border-radius: var(--radius-card);
  padding: 34px 20px;
  text-align: center;
  box-shadow: var(--card-shadow);
  border-bottom: 3px solid var(--luxury-gold);
}

.stat-big-num {
  font-size: 38px;
  font-weight: 900;
  color: var(--primary-blue);
  line-height: 1.15;
  margin-bottom: 8px;
}

.stat-label {
  font-size: 15px;
  font-weight: 800;
  color: var(--text-heading);
}

/* ==========================================================================
   8. 安全信任：左图右文不对称布局（左 46% 产品图，右 54% 4 条安全要点）
   ========================================================================== */
.security-split-2 {
  display: grid;
  grid-template-columns: 0.88fr 1.12fr;
  gap: 48px;
  align-items: center;
}

.security-visual-stack {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.security-main-img {
  background-color: var(--cyber-black);
  border: 1.5px solid var(--luxury-gold);
  border-radius: var(--radius-card);
  padding: 12px;
  box-shadow: var(--card-shadow);
}

.security-main-img img {
  border-radius: 10px;
  width: 100%;
  height: auto;
}

.security-points-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.sec-point-card {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  background-color: #FFFFFF;
  border: var(--gold-border);
  border-radius: var(--radius-card);
  padding: 22px 24px;
  box-shadow: var(--card-shadow);
}

.sec-point-icon {
  width: 46px;
  height: 46px;
  flex-shrink: 0;
  border-radius: 12px;
  background: var(--cyber-black);
  color: var(--luxury-gold-bright);
  border: 1px solid var(--luxury-gold);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
}

.sec-point-body h4 {
  font-size: 18px;
  font-weight: 800;
  color: var(--text-heading);
  margin-bottom: 6px;
}

.sec-point-body p {
  font-size: 14.5px;
  color: var(--text-body);
  line-height: 1.6;
}

/* ==========================================================================
   9. FAQ：单列手风琴，最大宽 800px，8–10 题
   ========================================================================== */
.faq-container-800 {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-item {
  background-color: #FFFFFF;
  border: var(--gold-border);
  border-radius: var(--radius-card);
  box-shadow: var(--card-shadow);
  overflow: hidden;
}

.faq-item summary {
  list-style: none;
  cursor: pointer;
  padding: 20px 24px;
  font-size: 17px;
  font-weight: 800;
  color: var(--text-heading);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item summary::after {
  content: "+";
  width: 28px;
  height: 28px;
  flex-shrink: 0;
  border-radius: 8px;
  background-color: var(--cyber-black);
  color: var(--luxury-gold-bright);
  border: 1px solid var(--luxury-gold);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  font-weight: 900;
}

.faq-item[open] summary {
  color: var(--primary-blue);
  border-bottom: 1px solid rgba(212, 175, 55, 0.25);
}

.faq-item[open] summary::after {
  content: "−";
  background-color: var(--primary-blue);
  color: #FFFFFF;
}

.faq-ans {
  padding: 18px 24px 22px;
  font-size: 15px;
  color: var(--text-body);
  line-height: 1.7;
}

/* ==========================================================================
   子页面公共 Banner 与四档价格卡（仅用于 download.html 和 pricing.html）
   ========================================================================== */
.subpage-hero {
  padding: 72px 0 56px;
  text-align: center;
  background-color: var(--bg-alt);
  background-image: radial-gradient(rgba(26, 34, 56, 0.08) 1.25px, transparent 1.25px);
  background-size: 26px 26px;
}

.subpage-hero h1 {
  font-size: 42px;
  font-weight: 900;
  color: var(--text-heading);
  margin-bottom: 14px;
}

.subpage-hero p {
  max-width: 680px;
  margin: 0 auto;
  font-size: 17px;
  color: var(--text-body);
}

.pricing-grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  align-items: stretch;
}

.pricing-card {
  background-color: #FFFFFF;
  border: var(--gold-border);
  border-radius: var(--radius-card);
  padding: 32px 24px;
  box-shadow: var(--card-shadow);
  display: flex;
  flex-direction: column;
  position: relative;
}

.pricing-card.featured {
  border: 2px solid var(--luxury-gold);
  box-shadow: var(--card-shadow-hover);
}

.pricing-badge {
  position: absolute;
  top: -13px;
  left: 20px;
  background: var(--cyber-black);
  color: var(--luxury-gold-bright);
  border: 1px solid var(--luxury-gold);
  font-size: 12px;
  font-weight: 800;
  padding: 4px 12px;
  border-radius: 999px;
}

.pricing-card h3 {
  font-size: 21px;
  font-weight: 800;
  color: var(--text-heading);
  margin-bottom: 6px;
}

.price-desc {
  font-size: 13.5px;
  color: var(--text-body);
  margin-bottom: 18px;
}

.price-num {
  font-size: 36px;
  font-weight: 900;
  color: var(--text-heading);
  margin-bottom: 20px;
}

.price-num span {
  font-size: 14px;
  font-weight: 700;
  color: var(--text-body);
}

.price-features {
  margin-bottom: 24px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  flex: 1;
}

.price-features li {
  font-size: 14px;
  color: var(--text-heading);
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 8px;
}

.price-features li::before {
  content: "✓";
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--cyber-black);
  color: var(--luxury-gold-bright);
  font-size: 11px;
  font-weight: 900;
}

/* ==========================================================================
   10. 页脚：深蓝 #0B1023，左品牌简介 + 右三列链接 + 底下一行版权
   ========================================================================== */
.site-footer {
  background-color: var(--bg-footer);
  color: rgba(255, 255, 255, 0.72);
  padding: 72px 0 36px;
  border-top: 2px solid rgba(212, 175, 55, 0.35);
}

.footer-top-grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 48px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-brand .brand-logo {
  color: #FFFFFF;
  margin-bottom: 16px;
}

.footer-brand p {
  font-size: 14.5px;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.68);
  max-width: 340px;
}

.footer-col h4 {
  font-size: 16px;
  font-weight: 800;
  color: var(--luxury-gold-bright);
  margin-bottom: 18px;
}

.footer-col ul {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-col a {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.68);
}

.footer-col a:hover {
  color: var(--luxury-gold-bright);
}

.footer-bottom {
  padding-top: 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 13.5px;
  color: rgba(255, 255, 255, 0.55);
  flex-wrap: wrap;
  gap: 12px;
}

.footer-bottom a:hover {
  color: #FFFFFF;
}

/* ==========================================================================
   响应式适配（移动端汉堡菜单，Hero 改居中单列）
   ========================================================================== */
@media (max-width: 1024px) {
  .hero-flex {
    flex-direction: column;
    text-align: center;
    gap: 48px;
  }

  .hero-left,
  .hero-right {
    max-width: 100%;
    flex: 1 1 auto;
  }

  .hero-selling-points {
    border-left: none;
    padding-left: 0;
  }

  .hero-buttons {
    justify-content: center;
  }

  .features-grid-6 {
    grid-template-columns: repeat(2, 1fr);
  }

  .platforms-grid-4,
  .stats-band-4,
  .pricing-grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }

  .security-split-2 {
    grid-template-columns: 1fr;
  }

  .footer-top-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .hamburger-btn {
    display: inline-flex;
  }

  .header-cta {
    display: none;
  }

  .header-nav {
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    background-color: var(--bg-main);
    flex-direction: column;
    padding: 20px 24px;
    gap: 12px;
    display: none;
    box-shadow: 0 12px 24px rgba(26, 34, 56, 0.12);
  }

  .nav-toggle-checkbox:checked ~ .header-nav {
    display: flex;
  }

  .hero-section {
    min-height: auto;
    padding: 48px 0 64px;
  }

  .hero-h1 {
    font-size: 35px;
  }

  .sec-head h2 {
    font-size: 28px;
  }

  .features-grid-6,
  .steps-grid-3,
  .platforms-grid-4,
  .reviews-grid-3,
  .stats-band-4,
  .pricing-grid-4,
  .footer-top-grid {
    grid-template-columns: 1fr;
  }

  .hero-mini-stats {
    flex-direction: column;
  }

  .mini-stat-item {
    width: 100%;
  }

  .cyber-float-card.pos-top-right {
    top: -10px;
    right: 4px;
  }

  .cyber-float-card.pos-bottom-left {
    bottom: -10px;
    left: 4px;
  }
}