/* ==========================================================================
   OKX 欧易专属推广落地页 核心样式表 (style.css)
   风格：现代科技暗黑风、高转化 CTA、微拟物玻璃拟态、移动端优先适配
   ========================================================================== */

:root {
  --bg-main: #07090e;
  --bg-card: rgba(18, 23, 34, 0.75);
  --bg-card-hover: rgba(28, 35, 51, 0.85);
  --bg-glass: rgba(255, 255, 255, 0.04);
  --border-color: rgba(255, 255, 255, 0.09);
  --border-glow: rgba(0, 240, 144, 0.3);
  
  --brand-okx: #ffffff;
  --accent-green: #00f090;
  --accent-green-hover: #00c978;
  --accent-blue: #2d60ff;
  --accent-gold: #f59e0b;
  --accent-red: #f43f5e;

  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;

  --shadow-card: 0 10px 30px -10px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 25px rgba(0, 240, 144, 0.25);
  --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

/* 基础重置 */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-tap-highlight-color: transparent;
}

body {
  background-color: var(--bg-main);
  color: var(--text-primary);
  font-family: var(--font-family);
  line-height: 1.6;
  overflow-x: hidden;
  background-image: 
    radial-gradient(circle at 15% 15%, rgba(45, 96, 255, 0.12) 0%, transparent 40%),
    radial-gradient(circle at 85% 30%, rgba(0, 240, 144, 0.1) 0%, transparent 45%),
    radial-gradient(circle at 50% 80%, rgba(245, 158, 11, 0.06) 0%, transparent 50%);
  background-attachment: fixed;
}

a {
  color: inherit;
  text-decoration: none;
  transition: var(--transition);
}

img, svg {
  display: block;
  max-width: 100%;
}

button {
  cursor: pointer;
  border: none;
  outline: none;
  font-family: inherit;
}

.container {
  width: 100%;
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 20px;
}

/* 页面通用标题组件 */
.section-header {
  text-align: center;
  margin-bottom: 48px;
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  background: rgba(0, 240, 144, 0.1);
  border: 1px solid rgba(0, 240, 144, 0.25);
  border-radius: var(--radius-full);
  color: var(--accent-green);
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.5px;
  margin-bottom: 12px;
  text-transform: uppercase;
}

.section-title {
  font-size: 2.2rem;
  font-weight: 800;
  letter-spacing: -0.5px;
  color: var(--text-primary);
  margin-bottom: 12px;
}

.section-subtitle {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 680px;
  margin: 0 auto;
}

/* 渐变强调文本 */
.text-gradient-green {
  background: linear-gradient(135deg, #00f090 0%, #00e5ff 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.text-gradient-gold {
  background: linear-gradient(135deg, #fbbf24 0%, #f59e0b 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* 按钮通用系统 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-weight: 700;
  font-size: 1rem;
  padding: 12px 24px;
  border-radius: var(--radius-md);
  transition: var(--transition);
  user-select: none;
}

.btn-primary {
  background: linear-gradient(135deg, #00f090 0%, #00e5ff 100%);
  color: #000000;
  box-shadow: 0 4px 20px rgba(0, 240, 144, 0.35);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(0, 240, 144, 0.5);
  filter: brightness(1.08);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.08);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  backdrop-filter: blur(10px);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.15);
  border-color: rgba(255, 255, 255, 0.3);
  transform: translateY(-2px);
}

.btn-lg {
  padding: 16px 32px;
  font-size: 1.12rem;
  border-radius: var(--radius-md);
}

/* 顶部吸顶导航栏 (Navbar) */
.header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(7, 9, 14, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-color);
  padding: 14px 0;
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo-wrapper {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-logo {
  font-size: 1.5rem;
  font-weight: 900;
  letter-spacing: -0.5px;
  color: #ffffff;
  display: flex;
  align-items: center;
  gap: 8px;
}

.brand-badge {
  font-size: 0.72rem;
  padding: 2px 8px;
  background: rgba(0, 240, 144, 0.15);
  color: var(--accent-green);
  border: 1px solid rgba(0, 240, 144, 0.3);
  border-radius: var(--radius-full);
  font-weight: 600;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 28px;
  list-style: none;
}

.nav-link {
  font-size: 0.95rem;
  color: var(--text-secondary);
  font-weight: 500;
}

.nav-link:hover {
  color: var(--accent-green);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 14px;
}

.invite-badge-nav {
  display: flex;
  align-items: center;
  gap: 6px;
  background: rgba(255, 255, 255, 0.05);
  padding: 6px 14px;
  border-radius: var(--radius-full);
  border: 1px dashed var(--accent-green);
  font-size: 0.85rem;
  cursor: pointer;
}

.invite-badge-nav span.code {
  color: var(--accent-green);
  font-weight: 700;
  letter-spacing: 0.5px;
}

.mobile-toggle {
  display: none;
  background: none;
  color: #ffffff;
  font-size: 1.6rem;
}

/* ==========================================================================
   Hero 首屏模块 (Hero Section)
   ========================================================================== */
.hero {
  padding: 60px 0 40px;
  position: relative;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 40px;
  align-items: center;
}

.hero-content {
  max-width: 650px;
}

.hero-headline {
  font-size: 3rem;
  line-height: 1.15;
  font-weight: 900;
  letter-spacing: -1px;
  margin-bottom: 20px;
}

.hero-description {
  font-size: 1.15rem;
  color: var(--text-secondary);
  margin-bottom: 28px;
  line-height: 1.65;
}

/* 专属福利亮点条 */
.hero-perks {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  margin-bottom: 32px;
}

.perk-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  padding: 16px;
  border-radius: var(--radius-md);
  text-align: left;
  position: relative;
  overflow: hidden;
  backdrop-filter: blur(12px);
  transition: var(--transition);
}

.perk-card:hover {
  border-color: rgba(0, 240, 144, 0.4);
  transform: translateY(-3px);
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.3);
}

.perk-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, #00f090, #00e5ff);
}

.perk-val {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--accent-green);
  display: flex;
  align-items: baseline;
  gap: 2px;
}

.perk-label {
  font-size: 0.82rem;
  color: var(--text-secondary);
  margin-top: 4px;
}

/* Hero 右侧快速转化卡片 */
.hero-card {
  background: linear-gradient(180deg, rgba(24, 31, 47, 0.9) 0%, rgba(14, 18, 28, 0.95) 100%);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.6), 0 0 30px rgba(0, 240, 144, 0.08);
  backdrop-filter: blur(20px);
  position: relative;
}

.hero-card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 24px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border-color);
}

.hero-card-title {
  font-size: 1.25rem;
  font-weight: 800;
  display: flex;
  align-items: center;
  gap: 8px;
}

.tag-gift {
  background: rgba(245, 158, 11, 0.15);
  color: var(--accent-gold);
  border: 1px solid rgba(245, 158, 11, 0.3);
  font-size: 0.75rem;
  padding: 3px 8px;
  border-radius: var(--radius-full);
  font-weight: 600;
}

.referral-box-inline {
  background: rgba(0, 0, 0, 0.35);
  border: 1px dashed rgba(0, 240, 144, 0.4);
  border-radius: var(--radius-md);
  padding: 16px;
  margin-bottom: 20px;
}

.referral-box-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.referral-box-info {
  display: flex;
  flex-direction: column;
}

.referral-box-info .label {
  font-size: 0.78rem;
  color: var(--text-muted);
}

.referral-box-info .code {
  font-size: 1.4rem;
  font-weight: 900;
  color: var(--accent-green);
  letter-spacing: 1px;
}

.copy-btn {
  padding: 8px 16px;
  background: rgba(0, 240, 144, 0.15);
  color: var(--accent-green);
  border: 1px solid rgba(0, 240, 144, 0.35);
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.88rem;
  transition: var(--transition);
}

.copy-btn:hover {
  background: var(--accent-green);
  color: #000;
}

.benefit-list {
  list-style: none;
  margin-bottom: 24px;
}

.benefit-list li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.92rem;
  color: var(--text-secondary);
  margin-bottom: 10px;
}

.benefit-list li svg {
  color: var(--accent-green);
  flex-shrink: 0;
}

.hero-cta-btn {
  width: 100%;
  padding: 16px;
  font-size: 1.15rem;
  font-weight: 800;
  text-align: center;
}

.security-badges-row {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 18px;
  margin-top: 16px;
  font-size: 0.78rem;
  color: var(--text-muted);
}

.security-badges-row span {
  display: flex;
  align-items: center;
  gap: 5px;
}

/* ==========================================================================
   实时行情走势看板 (Market Ticker)
   ========================================================================== */
.market-ticker-section {
  padding: 20px 0 40px;
}

.market-ticker-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.ticker-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: var(--transition);
}

.ticker-card:hover {
  border-color: rgba(255, 255, 255, 0.25);
  transform: translateY(-2px);
}

.ticker-left {
  display: flex;
  align-items: center;
  gap: 12px;
}

.coin-icon {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 0.9rem;
}

.coin-btc { background: #f7931a; color: #fff; }
.coin-eth { background: #627eea; color: #fff; }
.coin-sol { background: #14f195; color: #000; }
.coin-okb { background: #2d60ff; color: #fff; }

.coin-meta .coin-symbol {
  font-weight: 700;
  font-size: 1rem;
}

.coin-meta .coin-name {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.ticker-right {
  text-align: right;
}

.coin-price {
  font-weight: 800;
  font-size: 1.05rem;
}

.coin-change {
  font-size: 0.8rem;
  font-weight: 700;
  padding: 2px 6px;
  border-radius: 4px;
  display: inline-block;
  margin-top: 2px;
}

.change-up {
  color: #10b981;
  background: rgba(16, 185, 129, 0.15);
}

.change-down {
  color: #f43f5e;
  background: rgba(244, 63, 94, 0.15);
}

/* ==========================================================================
   新手保姆级教程 (Step-by-Step HowTo Guide)
   ========================================================================== */
.steps-section {
  padding: 60px 0;
}

.steps-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  position: relative;
}

.step-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 30px 24px;
  position: relative;
  transition: var(--transition);
}

.step-card:hover {
  border-color: var(--accent-green);
  transform: translateY(-5px);
  box-shadow: var(--shadow-card);
}

.step-number {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: rgba(0, 240, 144, 0.12);
  border: 1px solid rgba(0, 240, 144, 0.3);
  color: var(--accent-green);
  font-size: 1.25rem;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
}

.step-title {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.step-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.step-tips {
  margin-top: 16px;
  padding-top: 14px;
  border-top: 1px dashed var(--border-color);
  font-size: 0.8rem;
  color: var(--accent-green);
}

/* ==========================================================================
   六大核心业务产品矩阵 (Products & Features)
   ========================================================================== */
.products-section {
  padding: 60px 0;
}

.products-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.product-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
}

.product-card:hover {
  border-color: rgba(255, 255, 255, 0.28);
  transform: translateY(-4px);
  background: var(--bg-card-hover);
}

.product-icon {
  width: 52px;
  height: 52px;
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.05);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  color: var(--accent-green);
}

.product-title {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.product-desc {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 20px;
  flex-grow: 1;
}

.product-features-list {
  list-style: none;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.product-features-list li {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 6px;
}

.product-features-list li::before {
  content: "•";
  color: var(--accent-green);
  font-weight: bold;
}

/* ==========================================================================
   储备金证明与安全背书 (POR & Security)
   ========================================================================== */
.security-section {
  padding: 60px 0;
}

.security-box {
  background: linear-gradient(135deg, rgba(20, 27, 42, 0.9) 0%, rgba(10, 14, 23, 0.95) 100%);
  border: 1px solid rgba(0, 240, 144, 0.25);
  border-radius: var(--radius-lg);
  padding: 48px;
  box-shadow: var(--shadow-glow);
}

.security-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 40px;
  align-items: center;
}

.por-stats-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-top: 24px;
}

.por-stat-item {
  background: rgba(0, 0, 0, 0.35);
  border: 1px solid var(--border-color);
  padding: 16px;
  border-radius: var(--radius-md);
  text-align: center;
}

.por-stat-num {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--accent-green);
}

.por-stat-label {
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-top: 4px;
}

/* ==========================================================================
   APP 下载中心模块 (App Download Center)
   ========================================================================== */
.download-section {
  padding: 60px 0;
}

.download-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 48px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: center;
}

.download-channels-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin-top: 28px;
}

.channel-btn {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px 20px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  transition: var(--transition);
}

.channel-btn:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: rgba(255, 255, 255, 0.3);
  transform: translateY(-2px);
}

.channel-btn svg {
  width: 28px;
  height: 28px;
  flex-shrink: 0;
}

.channel-text .channel-sub {
  font-size: 0.72rem;
  color: var(--text-muted);
}

.channel-text .channel-name {
  font-weight: 700;
  font-size: 0.95rem;
}

.download-qr-box {
  background: rgba(0, 0, 0, 0.4);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 24px;
  text-align: center;
  max-width: 320px;
  margin: 0 auto;
}

.qr-placeholder {
  width: 180px;
  height: 180px;
  margin: 0 auto 16px;
  background: #ffffff;
  border-radius: var(--radius-sm);
  padding: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.qr-tip {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

/* ==========================================================================
   常见问题手风琴组件 (FAQ Accordion)
   ========================================================================== */
.faq-section {
  padding: 60px 0;
}

.faq-list {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: var(--transition);
}

.faq-item.active {
  border-color: rgba(0, 240, 144, 0.4);
  background: rgba(24, 31, 47, 0.8);
}

.faq-question {
  width: 100%;
  text-align: left;
  background: none;
  padding: 20px 24px;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
}

.faq-icon {
  font-size: 1.3rem;
  color: var(--text-muted);
  transition: transform 0.3s ease;
}

.faq-item.active .faq-icon {
  transform: rotate(45deg);
  color: var(--accent-green);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease-out;
  padding: 0 24px;
}

.faq-answer-content {
  padding-bottom: 20px;
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.7;
}

/* ==========================================================================
   页尾与合规免责声明 (Footer & Disclaimers)
   ========================================================================== */
.footer {
  background: #040508;
  border-top: 1px solid var(--border-color);
  padding: 60px 0 100px;
  margin-top: 80px;
}

.footer-top {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 40px;
  padding-bottom: 40px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.footer-brand-desc {
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-top: 14px;
  max-width: 320px;
  line-height: 1.6;
}

.footer-col h4 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--text-primary);
}

.footer-links {
  list-style: none;
}

.footer-links li {
  margin-bottom: 10px;
}

.footer-links a {
  font-size: 0.88rem;
  color: var(--text-muted);
}

.footer-links a:hover {
  color: var(--accent-green);
}

.footer-disclaimer {
  margin-top: 30px;
  padding: 20px;
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid rgba(255, 255, 255, 0.04);
  border-radius: var(--radius-sm);
  font-size: 0.78rem;
  color: var(--text-muted);
  line-height: 1.6;
}

.footer-bottom {
  margin-top: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.82rem;
  color: var(--text-muted);
}

/* ==========================================================================
   移动端底部吸底转化栏 (Mobile Fixed Bottom CTA)
   ========================================================================== */
.mobile-sticky-bar {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  width: 100%;
  background: rgba(7, 9, 14, 0.95);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  padding: 12px 16px;
  z-index: 999;
  box-shadow: 0 -8px 25px rgba(0, 0, 0, 0.5);
}

.mobile-sticky-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.mobile-sticky-info {
  display: flex;
  flex-direction: column;
}

.mobile-sticky-info .m-title {
  font-size: 0.85rem;
  font-weight: 800;
  color: #fff;
}

.mobile-sticky-info .m-sub {
  font-size: 0.75rem;
  color: var(--accent-green);
}

.mobile-sticky-btn {
  padding: 10px 20px;
  font-size: 0.92rem;
  font-weight: 800;
  white-space: nowrap;
}

/* ==========================================================================
   全局 Toast 弹窗反馈
   ========================================================================== */
.toast-notice {
  position: fixed;
  top: 30px;
  left: 50%;
  transform: translateX(-50%) translateY(-100px);
  background: #1e293b;
  color: #ffffff;
  border: 1px solid var(--accent-green);
  padding: 12px 24px;
  border-radius: var(--radius-full);
  font-size: 0.92rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 10px;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.4), 0 0 15px rgba(0, 240, 144, 0.3);
  z-index: 9999;
  transition: transform 0.35s cubic-bezier(0.175, 0.885, 0.32, 1.275), opacity 0.35s ease;
  opacity: 0;
  pointer-events: none;
}

.toast-notice.show {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
}

/* ==========================================================================
   响应式断点 (Media Queries)
   ========================================================================== */
@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  .hero-content {
    max-width: 100%;
    text-align: center;
  }
  .hero-perks {
    max-width: 600px;
    margin: 0 auto 32px;
  }
  .steps-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .products-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .market-ticker-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .security-grid, .download-card {
    grid-template-columns: 1fr;
  }
  .footer-top {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .nav-menu {
    display: none;
  }
  .mobile-toggle {
    display: block;
  }
  .hero-headline {
    font-size: 2.2rem;
  }
  .hero-perks {
    grid-template-columns: 1fr;
    gap: 10px;
  }
  .steps-grid {
    grid-template-columns: 1fr;
  }
  .products-grid {
    grid-template-columns: 1fr;
  }
  .market-ticker-grid {
    grid-template-columns: 1fr;
  }
  .download-channels-grid {
    grid-template-columns: 1fr;
  }
  .footer-top {
    grid-template-columns: 1fr;
  }
  .mobile-sticky-bar {
    display: block;
  }
  .footer {
    padding-bottom: 120px;
  }
}

/* ==========================================================================
   品牌别名与搜索指引 (Brand Aliases & Search Guide)
   ========================================================================== */
.aliases-section {
  padding: 60px 0;
}

.aliases-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 16px;
  margin-top: 28px;
}

.alias-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 22px 18px;
  text-align: center;
  transition: var(--transition);
}

.alias-card:hover {
  border-color: var(--accent-green);
  transform: translateY(-3px);
  background: var(--bg-card-hover);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.4);
}

.alias-keyword {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--accent-green);
  margin-bottom: 6px;
}

.alias-tag {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-bottom: 10px;
}

.alias-desc {
  font-size: 0.82rem;
  color: var(--text-secondary);
  line-height: 1.55;
}

@media (max-width: 1024px) {
  .aliases-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 768px) {
  .aliases-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}