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

:root {
  --primary: #165DFF;
  --primary-dark: #0E42D2;
  --primary-light: #4080FF;
  --primary-bg: #E8F3FF;
  --secondary: #0FC6C2;
  --success: #00B42A;
  --warning: #FF7D00;
  --danger: #F53F3F;
  --text-1: #1D2129;
  --text-2: #4E5969;
  --text-3: #86909C;
  --text-4: #C9CDD4;
  --border: #E5E6EB;
  --border-light: #F2F3F5;
  --bg: #FFFFFF;
  --bg-soft: #F7F8FA;
  --bg-dark: #0F172A;
  --bg-dark-2: #1E293B;
  --radius-sm: 6px;
  --radius: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow: 0 4px 16px rgba(0,0,0,0.08);
  --shadow-lg: 0 12px 32px rgba(22, 93, 255, 0.12);
  --transition: all 0.3s ease;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  font-size: 15px;
  line-height: 1.7;
  color: var(--text-1);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

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

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

a:hover {
  color: var(--primary-dark);
}

ul, ol {
  list-style: none;
}

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

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

/* ========== 通用组件 ========== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 20px;
  border-radius: var(--radius);
  font-weight: 500;
  font-size: 14px;
  transition: var(--transition);
  text-align: center;
  white-space: nowrap;
}

.btn-lg {
  padding: 14px 28px;
  font-size: 15px;
}

.btn-sm {
  padding: 7px 14px;
  font-size: 13px;
}

.btn-block {
  width: 100%;
}

.btn-primary {
  background: var(--primary);
  color: #fff;
}

.btn-primary:hover {
  background: var(--primary-dark);
  color: #fff;
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(22, 93, 255, 0.25);
}

.btn-outline {
  border: 1.5px solid var(--primary);
  color: var(--primary);
  background: transparent;
}

.btn-outline:hover {
  background: var(--primary-bg);
  color: var(--primary-dark);
}

.btn-ghost {
  color: var(--text-2);
  background: transparent;
}

.btn-ghost:hover {
  color: var(--primary);
  background: var(--primary-bg);
}

.btn-light {
  background: #fff;
  color: var(--primary);
}

.btn-light:hover {
  background: var(--bg-soft);
  color: var(--primary-dark);
}

.btn-outline-light {
  border: 1.5px solid #fff;
  color: #fff;
  background: transparent;
}

.btn-outline-light:hover {
  background: rgba(255,255,255,0.1);
  color: #fff;
}

.section-header {
  text-align: center;
  margin-bottom: 56px;
}

.section-subtitle {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 2px;
  color: var(--primary);
  background: var(--primary-bg);
  padding: 6px 14px;
  border-radius: 20px;
  margin-bottom: 16px;
  text-transform: uppercase;
}

.section-title {
  font-size: 36px;
  font-weight: 700;
  color: var(--text-1);
  margin-bottom: 16px;
  line-height: 1.3;
}

.section-desc {
  max-width: 700px;
  margin: 0 auto;
  color: var(--text-2);
  font-size: 16px;
  line-height: 1.8;
}

.text-gradient {
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ========== 顶部通知栏 ========== */
.top-notice {
  background: linear-gradient(90deg, #FFF7E6 0%, #FFE7BA 100%);
  border-bottom: 1px solid #FFE7BA;
  padding: 10px 0;
  font-size: 13px;
}

.top-notice .container {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
}

.notice-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 20px;
  height: 20px;
  background: var(--warning);
  color: #fff;
  border-radius: 50%;
  font-weight: 700;
  font-size: 12px;
  flex-shrink: 0;
}

.top-notice p {
  color: #B88700;
}

/* ========== 导航栏 ========== */
.site-header {
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-light);
  position: sticky;
  top: 0;
  z-index: 1000;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 20px;
  font-weight: 700;
  color: var(--text-1);
}

.logo:hover {
  color: var(--primary);
}

.logo-mark {
  font-size: 24px;
  color: var(--primary);
}

.main-nav ul {
  display: flex;
  gap: 4px;
}

.main-nav a {
  display: block;
  padding: 8px 14px;
  color: var(--text-2);
  font-weight: 500;
  font-size: 14px;
  border-radius: var(--radius-sm);
}

.main-nav a:hover,
.main-nav a.active {
  color: var(--primary);
  background: var(--primary-bg);
}

.nav-close,
.nav-actions-mobile {
  display: none;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

.header-phone {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-2);
}

.header-phone:hover {
  color: var(--primary);
}

.phone-icon {
  color: var(--primary);
}

.auth-buttons {
  display: flex;
  gap: 8px;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 4px;
  padding: 8px;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text-1);
  border-radius: 2px;
  transition: var(--transition);
}

/* ========== Hero 区域 ========== */
.hero {
  padding: 80px 0 100px;
  background: linear-gradient(180deg, #F0F5FF 0%, #FFFFFF 100%);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -200px;
  right: -200px;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(22,93,255,0.08) 0%, transparent 70%);
  border-radius: 50%;
}

.hero .container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
  position: relative;
  z-index: 1;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: #fff;
  border: 1px solid var(--primary-bg);
  padding: 8px 16px;
  border-radius: 24px;
  font-size: 13px;
  color: var(--primary);
  font-weight: 500;
  margin-bottom: 24px;
  box-shadow: var(--shadow-sm);
}

.hero-badge .dot {
  width: 8px;
  height: 8px;
  background: var(--success);
  border-radius: 50%;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

.hero-title {
  font-size: 48px;
  font-weight: 700;
  line-height: 1.25;
  margin-bottom: 20px;
  color: var(--text-1);
}

.hero-subtitle {
  font-size: 17px;
  color: var(--text-2);
  line-height: 1.8;
  margin-bottom: 32px;
  max-width: 540px;
}

.hero-actions {
  display: flex;
  gap: 12px;
  margin-bottom: 40px;
  flex-wrap: wrap;
}

.hero-actions .arrow {
  transition: transform 0.3s ease;
}

.hero-actions .btn-primary:hover .arrow {
  transform: translateX(4px);
}

.hero-safety {
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
}

.safety-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: var(--text-2);
}

.check {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 20px;
  height: 20px;
  background: var(--success);
  color: #fff;
  border-radius: 50%;
  font-size: 12px;
  font-weight: 700;
}

.hero-visual {
  position: relative;
}

.hero-image-frame {
  position: relative;
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  border: 4px solid #fff;
}

.hero-image-frame img {
  width: 100%;
  aspect-ratio: 4/3;
  object-fit: cover;
}

.frame-glow {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(22,93,255,0.1) 0%, transparent 50%);
  pointer-events: none;
}

.float-card {
  position: absolute;
  background: #fff;
  border-radius: var(--radius-lg);
  padding: 14px 18px;
  box-shadow: var(--shadow);
  display: flex;
  align-items: center;
  gap: 12px;
  animation: floatIn 0.6s ease-out backwards;
}

.card-1 {
  bottom: 30px;
  left: -30px;
  animation-delay: 0.3s;
}

.card-2 {
  top: 30px;
  right: -20px;
  animation-delay: 0.5s;
}

@keyframes floatIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.card-icon {
  width: 40px;
  height: 40px;
  background: var(--primary-bg);
  color: var(--primary);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
}

.card-label {
  font-size: 12px;
  color: var(--text-3);
  margin-bottom: 2px;
}

.card-value {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-1);
}

/* ========== 平台分类 ========== */
.platforms {
  padding: 100px 0;
}

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

.platform-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: var(--transition);
}

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

.platform-icon {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 18px;
  color: #fff;
  margin-bottom: 20px;
}

.platform-icon.okx { background: linear-gradient(135deg, #165DFF, #4080FF); }
.platform-icon.binance { background: linear-gradient(135deg, #F3BA2F, #FFD700); color: #333; }
.platform-icon.bitget { background: linear-gradient(135deg, #00B42A, #23C343); }
.platform-icon.bybit { background: linear-gradient(135deg, #F7A600, #FFB72B); color: #333; }
.platform-icon.kraken { background: linear-gradient(135deg, #722ED1, #8F4BD3); }
.platform-icon.more { background: linear-gradient(135deg, #86909C, #A9AEB8); }

.platform-card h3 {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--text-1);
}

.platform-card > p {
  font-size: 14px;
  color: var(--text-2);
  line-height: 1.7;
  margin-bottom: 16px;
  min-height: 72px;
}

.platform-devices {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 20px;
}

.device-tag {
  font-size: 12px;
  padding: 4px 10px;
  background: var(--bg-soft);
  color: var(--text-2);
  border-radius: 4px;
  font-weight: 500;
}

.platform-actions {
  display: flex;
  gap: 8px;
  margin-bottom: 16px;
}

.platform-warning {
  font-size: 12px;
  color: var(--warning);
  background: #FFF7E6;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  border-left: 3px solid var(--warning);
}

/* ========== 下载中心 ========== */
.downloads {
  padding: 100px 0;
  background: var(--bg-soft);
}

.device-tabs {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-bottom: 32px;
  flex-wrap: wrap;
}

.device-tab {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 15px;
  font-weight: 500;
  color: var(--text-2);
  transition: var(--transition);
}

.device-tab:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.device-tab.active {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
  box-shadow: 0 4px 12px rgba(22,93,255,0.2);
}

.tab-icon {
  font-size: 18px;
}

.download-panel {
  display: none;
  background: #fff;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.download-panel.active {
  display: block;
  animation: fadeIn 0.3s ease;
}

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

.download-info-bar {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--border-light);
  border-bottom: 1px solid var(--border-light);
}

.info-item {
  background: var(--bg-soft);
  padding: 20px;
}

.info-label {
  display: block;
  font-size: 12px;
  color: var(--text-3);
  margin-bottom: 6px;
  font-weight: 500;
}

.info-value {
  font-size: 14px;
  color: var(--text-1);
  font-weight: 600;
}

.download-list {
  padding: 8px 0;
}

.download-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px;
  border-bottom: 1px solid var(--border-light);
  gap: 20px;
}

.download-item:last-child {
  border-bottom: none;
}

.download-platform {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-1);
  min-width: 120px;
}

.download-desc {
  flex: 1;
  font-size: 14px;
  color: var(--text-2);
}

.download-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

.source-tag {
  font-size: 12px;
  padding: 5px 10px;
  background: #FFF7E6;
  color: var(--warning);
  border-radius: 4px;
  font-weight: 500;
}

.pre-download-check {
  margin-top: 32px;
  background: #fff;
  border-radius: var(--radius-lg);
  padding: 28px;
  border: 1px solid var(--border);
}

.pre-download-check h4 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 20px;
  color: var(--text-1);
}

.check-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.check-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 16px;
  background: var(--bg-soft);
  border-radius: var(--radius);
}

.check-num {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  background: var(--primary);
  color: #fff;
  border-radius: 50%;
  font-weight: 700;
  font-size: 13px;
  flex-shrink: 0;
}

.check-item p {
  font-size: 14px;
  color: var(--text-2);
  line-height: 1.6;
}

/* ========== 功能介绍 ========== */
.features {
  padding: 100px 0;
}

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

.feature-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: var(--transition);
}

.feature-card:hover {
  border-color: var(--primary-light);
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

.feature-icon {
  width: 56px;
  height: 56px;
  background: var(--primary-bg);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  margin-bottom: 20px;
}

.feature-card h3 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--text-1);
}

.feature-card > p {
  font-size: 14px;
  color: var(--text-2);
  line-height: 1.7;
  margin-bottom: 16px;
}

.risk-note {
  font-size: 12px;
  color: var(--warning);
  background: #FFF7E6;
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  line-height: 1.6;
}

/* ========== 安装流程 ========== */
.guide {
  padding: 100px 0;
  background: var(--bg-soft);
}

.steps-wrapper {
  position: relative;
  max-width: 800px;
  margin: 0 auto;
  padding-left: 40px;
}

.step-line {
  position: absolute;
  left: 19px;
  top: 20px;
  bottom: 20px;
  width: 2px;
  background: linear-gradient(180deg, var(--primary) 0%, var(--primary-light) 100%);
}

.step-item {
  position: relative;
  margin-bottom: 40px;
  background: #fff;
  border-radius: var(--radius-lg);
  padding: 28px 28px 28px 36px;
  box-shadow: var(--shadow-sm);
  margin-left: 20px;
}

.step-item:last-child {
  margin-bottom: 0;
}

.step-number {
  position: absolute;
  left: -56px;
  top: 28px;
  width: 40px;
  height: 40px;
  background: var(--primary);
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 18px;
  box-shadow: 0 0 0 6px #fff;
}

.step-content h3 {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--text-1);
}

.step-content > p {
  font-size: 15px;
  color: var(--text-2);
  line-height: 1.7;
  margin-bottom: 16px;
}

.step-content ul {
  display: grid;
  gap: 8px;
}

.step-content li {
  position: relative;
  padding-left: 20px;
  font-size: 14px;
  color: var(--text-2);
  line-height: 1.6;
}

.step-content li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 10px;
  width: 6px;
  height: 6px;
  background: var(--primary);
  border-radius: 50%;
}

/* ========== 安全说明 ========== */
.safety {
  padding: 100px 0;
  background: linear-gradient(135deg, #0F172A 0%, #1E293B 100%);
  color: #fff;
}

.safety-header {
  text-align: center;
  margin-bottom: 48px;
}

.safety-sub {
  background: rgba(255,255,255,0.1);
  color: var(--secondary);
}

.safety-header h2 {
  font-size: 36px;
  font-weight: 700;
  margin-bottom: 16px;
}

.safety-header p {
  color: rgba(255,255,255,0.7);
  font-size: 16px;
  max-width: 600px;
  margin: 0 auto;
}

.safety-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.safety-card {
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: var(--radius-lg);
  padding: 24px;
  transition: var(--transition);
}

.safety-card:hover {
  background: rgba(255,255,255,0.08);
  border-color: rgba(255,255,255,0.2);
}

.safety-card-highlight {
  background: rgba(245,63,63,0.15);
  border-color: rgba(245,63,63,0.3);
}

.safety-card-highlight:hover {
  background: rgba(245,63,63,0.2);
}

.safety-icon {
  font-size: 28px;
  margin-bottom: 16px;
}

.safety-card h4 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 10px;
}

.safety-card p {
  font-size: 13px;
  color: rgba(255,255,255,0.7);
  line-height: 1.7;
}

/* ========== 资讯列表（严格遵守规则） ========== */
.news {
  padding: 100px 0;
}

ul.article-cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 20px;
  list-style: none;
  margin: 0;
  padding: 0;
  width: 100%;
  box-sizing: border-box;
}

ul.article-cards > li.article-card {
  min-width: 0;
  width: auto;
  max-width: none;
  margin: 0;
  float: none;
  box-sizing: border-box;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: var(--transition);
  cursor: pointer;
}

ul.article-cards > li.article-card:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
}

ul.article-cards > li.article-card > a {
  display: block;
  color: inherit;
}

ul.article-cards > li.article-card > a:hover {
  color: inherit;
}

.article-card .card-thumb {
  width: 100%;
  overflow: hidden;
  aspect-ratio: 16/10;
}

.article-card .card-thumb img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.3s ease;
}

.article-card:hover .card-thumb img {
  transform: scale(1.05);
}

.article-card .card-body {
  padding: 20px;
}

.article-card .card-title {
  overflow-wrap: anywhere;
  font-size: 16px;
  font-weight: 600;
  line-height: 1.5;
  color: var(--text-1);
  margin-bottom: 10px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.article-card .card-date {
  display: block;
  font-size: 12px;
  color: var(--text-3);
  margin-bottom: 10px;
}

.article-card .card-summary {
  overflow-wrap: anywhere;
  font-size: 13px;
  color: var(--text-2);
  line-height: 1.6;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* ========== FAQ ========== */
.faq {
  padding: 100px 0;
  background: var(--bg-soft);
}

.faq-list {
  max-width: 860px;
  margin: 0 auto;
}

.faq-item {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 12px;
  overflow: hidden;
  transition: var(--transition);
}

.faq-item:hover {
  border-color: var(--primary-light);
}

.faq-item.active {
  border-color: var(--primary);
  box-shadow: var(--shadow-sm);
}

.faq-question {
  width: 100%;
  padding: 20px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  font-size: 15px;
  font-weight: 600;
  color: var(--text-1);
  text-align: left;
}

.faq-icon {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--primary-bg);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  font-weight: 700;
  flex-shrink: 0;
  transition: var(--transition);
}

.faq-item.active .faq-icon {
  background: var(--primary);
  color: #fff;
  transform: rotate(45deg);
}

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

.faq-item.active .faq-answer {
  max-height: 500px;
}

.faq-answer p {
  padding: 0 24px 20px;
  font-size: 14px;
  color: var(--text-2);
  line-height: 1.8;
}

/* ========== 关于我们 ========== */
.about {
  padding: 100px 0;
}

.about-inner {
  display: grid;
  grid-template-columns: 1fr 340px;
  gap: 48px;
  align-items: start;
}

.about-content .section-subtitle {
  margin-bottom: 16px;
}

.about-content h2 {
  font-size: 32px;
  font-weight: 700;
  margin-bottom: 20px;
  color: var(--text-1);
}

.about-lead {
  font-size: 16px;
  color: var(--text-2);
  line-height: 1.8;
  margin-bottom: 28px;
}

.about-services {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
  margin-bottom: 28px;
}

.service-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  color: var(--text-2);
}

.service-dot {
  width: 8px;
  height: 8px;
  background: var(--primary);
  border-radius: 50%;
  flex-shrink: 0;
}

.about-disclaimer {
  background: #FFF7E6;
  border-left: 4px solid var(--warning);
  padding: 20px;
  border-radius: 0 var(--radius) var(--radius) 0;
  font-size: 13px;
  color: #663C00;
  line-height: 1.8;
}

.about-disclaimer strong {
  color: #B88700;
}

.sidebar-card {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: #fff;
  border-radius: var(--radius-lg);
  padding: 28px;
  position: sticky;
  top: 92px;
}

.sidebar-card h4 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 20px;
}

.sidebar-card ul {
  display: grid;
  gap: 12px;
}

.sidebar-card li {
  position: relative;
  padding-left: 24px;
  font-size: 14px;
  line-height: 1.6;
  color: rgba(255,255,255,0.9);
}

.sidebar-card li::before {
  content: '✓';
  position: absolute;
  left: 0;
  top: 0;
  width: 18px;
  height: 18px;
  background: rgba(255,255,255,0.2);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  font-weight: 700;
}

/* ========== 联系方式 ========== */
.contact {
  padding: 100px 0;
  background: var(--bg-soft);
}

.contact-wrapper {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: start;
}

.contact-info h3 {
  font-size: 28px;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--text-1);
}

.contact-desc {
  font-size: 15px;
  color: var(--text-2);
  line-height: 1.8;
  margin-bottom: 28px;
}

.contact-methods {
  display: grid;
  gap: 16px;
  margin-bottom: 24px;
}

.contact-method {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 20px;
  background: #fff;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  transition: var(--transition);
  color: inherit;
}

.contact-method:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow-sm);
  color: inherit;
}

.method-icon {
  width: 48px;
  height: 48px;
  background: var(--primary-bg);
  color: var(--primary);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  flex-shrink: 0;
}

.method-label {
  font-size: 12px;
  color: var(--text-3);
  margin-bottom: 4px;
}

.method-value {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-1);
}

.contact-note {
  background: #FFF1F0;
  border: 1px solid #FFCCC7;
  border-radius: var(--radius);
  padding: 16px;
  font-size: 13px;
  color: #CF1322;
  line-height: 1.7;
}

.contact-note strong {
  display: block;
  margin-bottom: 4px;
}

.contact-form-wrapper {
  background: #fff;
  border-radius: var(--radius-lg);
  padding: 32px;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
}

.contact-form-wrapper h4 {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--text-1);
}

.form-note {
  font-size: 13px;
  color: var(--text-3);
  line-height: 1.6;
  margin-bottom: 24px;
  padding: 12px;
  background: var(--bg-soft);
  border-radius: var(--radius-sm);
}

.form-note strong {
  color: var(--warning);
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.form-group {
  margin-bottom: 16px;
}

.form-group label {
  display: block;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-2);
  margin-bottom: 8px;
}

.form-input {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 14px;
  font-family: inherit;
  color: var(--text-1);
  background: #fff;
  transition: var(--transition);
}

.form-input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-bg);
}

textarea.form-input {
  resize: vertical;
  min-height: 100px;
}

select.form-input {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%2386909C' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 16px center;
  padding-right: 40px;
}

/* ========== 文章详情页 ========== */
.article-detail {
  padding: 60px 0 80px;
}

.article-container {
  max-width: 820px;
  margin: 0 auto;
}

.article-breadcrumb {
  margin-bottom: 24px;
  font-size: 14px;
  color: var(--text-3);
}

.article-breadcrumb a {
  color: var(--text-3);
}

.article-breadcrumb a:hover {
  color: var(--primary);
}

.article-header {
  margin-bottom: 32px;
}

.article-title {
  font-size: 36px;
  font-weight: 700;
  line-height: 1.3;
  color: var(--text-1);
  margin-bottom: 20px;
}

.article-meta {
  display: flex;
  gap: 20px;
  margin-bottom: 20px;
  font-size: 13px;
  color: var(--text-3);
  flex-wrap: wrap;
}

.article-summary {
  font-size: 16px;
  color: var(--text-2);
  line-height: 1.8;
  padding: 20px;
  background: var(--primary-bg);
  border-radius: var(--radius);
  border-left: 4px solid var(--primary);
}

.article-cover {
  margin-bottom: 32px;
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.article-cover img {
  width: 100%;
  aspect-ratio: 16/9;
  object-fit: cover;
}

.article-content {
  font-size: 16px;
  line-height: 1.9;
  color: var(--text-1);
  margin-bottom: 40px;
}

.article-content p {
  margin-bottom: 20px;
}

.article-content h2,
.article-content h3,
.article-content h4 {
  font-weight: 700;
  margin: 32px 0 16px;
  color: var(--text-1);
}

.article-content h2 { font-size: 24px; }
.article-content h3 { font-size: 20px; }
.article-content h4 { font-size: 18px; }

.article-content img {
  max-width: 100%;
  border-radius: var(--radius);
  margin: 20px 0;
}

.article-content ul,
.article-content ol {
  margin-bottom: 20px;
  padding-left: 24px;
}

.article-content ul {
  list-style: disc;
}

.article-content ol {
  list-style: decimal;
}

.article-content li {
  margin-bottom: 8px;
  line-height: 1.8;
}

.article-content blockquote {
  padding: 20px 24px;
  background: var(--bg-soft);
  border-left: 4px solid var(--primary);
  border-radius: 0 var(--radius) var(--radius) 0;
  margin: 20px 0;
  color: var(--text-2);
}

.article-safety-note {
  background: #FFF1F0;
  border: 1px solid #FFCCC7;
  border-radius: var(--radius-lg);
  padding: 24px;
  margin-bottom: 40px;
}

.article-safety-note h4 {
  font-size: 16px;
  font-weight: 700;
  color: #CF1322;
  margin-bottom: 12px;
}

.article-safety-note p {
  font-size: 14px;
  color: #7D1E1E;
  line-height: 1.8;
  margin-bottom: 0;
}

.related-nav {
  margin-bottom: 40px;
}

.related-nav h3 {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 20px;
  color: var(--text-1);
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.related-card {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 20px;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  color: inherit;
  transition: var(--transition);
}

.related-card:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow-sm);
  color: inherit;
  transform: translateY(-2px);
}

.related-icon {
  width: 44px;
  height: 44px;
  background: var(--primary-bg);
  color: var(--primary);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  flex-shrink: 0;
}

.related-card h4 {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-1);
  margin-bottom: 4px;
}

.related-card p {
  font-size: 13px;
  color: var(--text-3);
  margin-bottom: 0;
}

.article-back {
  display: flex;
  gap: 12px;
  justify-content: center;
}

.detail-cta {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  padding: 60px 0;
  color: #fff;
}

.cta-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 40px;
}

.cta-inner h3 {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 8px;
}

.cta-inner p {
  font-size: 15px;
  color: rgba(255,255,255,0.8);
  margin-bottom: 0;
}

.cta-actions {
  display: flex;
  gap: 12px;
  flex-shrink: 0;
}

/* ========== 页脚 ========== */
.site-footer {
  background: var(--bg-dark);
  color: rgba(255,255,255,0.7);
  padding-top: 64px;
}

.footer-top {
  display: grid;
  grid-template-columns: 1.5fr 2fr;
  gap: 60px;
  padding-bottom: 48px;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}

.logo-footer {
  color: #fff;
  margin-bottom: 20px;
}

.logo-footer:hover {
  color: var(--primary-light);
}

.footer-desc {
  font-size: 14px;
  line-height: 1.8;
  margin-bottom: 16px;
  color: rgba(255,255,255,0.6);
}

.footer-disclaimer {
  font-size: 12px;
  color: rgba(255,255,255,0.4);
  line-height: 1.7;
  margin-bottom: 20px;
}

.footer-phone {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 18px;
  font-weight: 700;
  color: #fff;
  padding: 10px 20px;
  background: rgba(255,255,255,0.1);
  border-radius: var(--radius);
}

.footer-phone:hover {
  background: var(--primary);
  color: #fff;
}

.footer-links {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
}

.footer-col h4 {
  font-size: 15px;
  font-weight: 600;
  color: #fff;
  margin-bottom: 20px;
}

.footer-col ul {
  display: grid;
  gap: 10px;
}

.footer-col a {
  font-size: 13px;
  color: rgba(255,255,255,0.6);
  transition: var(--transition);
}

.footer-col a:hover {
  color: #fff;
}

.footer-col {grouplink} a {
  display: block;
  font-size: 13px;
  color: rgba(255,255,255,0.6);
  margin-bottom: 10px;
}

.footer-col {grouplink} a:hover {
  color: #fff;
}

.footer-bottom {
  padding: 24px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
}

.footer-copyright p {
  font-size: 13px;
  color: rgba(255,255,255,0.4);
  margin-bottom: 4px;
}

.footer-risk {
  font-size: 12px !important;
  color: rgba(245,63,63,0.6) !important;
}

.footer-beian {
  font-size: 12px;
  color: rgba(255,255,255,0.4);
}

.footer-beian a {
  color: rgba(255,255,255,0.5);
}

.footer-beian a:hover {
  color: #fff;
}

/* ========== 弹窗 ========== */
.demo-modal {
  position: fixed;
  inset: 0;
  z-index: 9999;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.demo-modal.active {
  display: flex;
  animation: fadeIn 0.3s ease;
}

.modal-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,0.5);
  backdrop-filter: blur(4px);
}

.modal-content {
  position: relative;
  background: #fff;
  border-radius: var(--radius-xl);
  padding: 40px;
  max-width: 440px;
  width: 100%;
  text-align: center;
  z-index: 1;
  animation: slideUp 0.3s ease;
}

@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.modal-close {
  position: absolute;
  top: 16px;
  right: 16px;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  color: var(--text-3);
  transition: var(--transition);
}

.modal-close:hover {
  background: var(--bg-soft);
  color: var(--text-1);
}

.modal-icon {
  width: 64px;
  height: 64px;
  background: var(--primary-bg);
  color: var(--primary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 28px;
  margin: 0 auto 20px;
}

.modal-content h3 {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--text-1);
}

.modal-content p {
  font-size: 14px;
  color: var(--text-2);
  line-height: 1.7;
  margin-bottom: 12px;
}

.modal-note {
  background: #FFF1F0;
  color: #CF1322 !important;
  padding: 12px;
  border-radius: var(--radius);
  font-size: 13px !important;
  margin-bottom: 20px !important;
}

/* ========== 返回顶部 ========== */
.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 48px;
  height: 48px;
  background: var(--primary);
  color: #fff;
  border-radius: 50%;
  font-size: 20px;
  font-weight: 700;
  box-shadow: 0 4px 16px rgba(22,93,255,0.3);
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: var(--transition);
  z-index: 999;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  background: var(--primary-dark);
  transform: translateY(-2px);
}

/* ========== 响应式 ========== */
@media (max-width: 1024px) {
  .hero .container {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .hero-title {
    font-size: 36px;
  }

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

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

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

  .about-inner {
    grid-template-columns: 1fr;
  }

  .sidebar-card {
    position: static;
  }

  .footer-top {
    grid-template-columns: 1fr;
    gap: 40px;
  }
}

@media (max-width: 768px) {
  .top-notice p {
    font-size: 12px;
    line-height: 1.5;
  }

  .main-nav {
    position: fixed;
    top: 0;
    right: -100%;
    width: 280px;
    height: 100vh;
    background: #fff;
    padding: 60px 24px 24px;
    box-shadow: -4px 0 20px rgba(0,0,0,0.1);
    transition: right 0.3s ease;
    z-index: 1001;
    overflow-y: auto;
  }

  .main-nav.active {
    right: 0;
  }

  .nav-close {
    display: flex;
    position: absolute;
    top: 16px;
    right: 16px;
    width: 36px;
    height: 36px;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    color: var(--text-2);
    border-radius: 50%;
  }

  .nav-close:hover {
    background: var(--bg-soft);
  }

  .main-nav ul {
    flex-direction: column;
    gap: 4px;
  }

  .main-nav a {
    padding: 12px 16px;
    font-size: 15px;
  }

  .nav-actions-mobile {
    display: flex;
    gap: 8px;
    margin-top: 20px;
    padding-top: 20px;
    border-top: 1px solid var(--border-light);
  }

  .nav-actions-mobile .btn {
    flex: 1;
  }

  .header-phone .phone-number,
  .auth-buttons {
    display: none;
  }

  .nav-toggle {
    display: flex;
  }

  .hero {
    padding: 40px 0 60px;
  }

  .hero-title {
    font-size: 28px;
  }

  .hero-subtitle {
    font-size: 15px;
  }

  .hero-actions {
    flex-direction: column;
  }

  .hero-actions .btn {
    width: 100%;
  }

  .hero-safety {
    gap: 12px;
  }

  .float-card {
    display: none;
  }

  .section-header {
    margin-bottom: 36px;
  }

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

  .section-desc {
    font-size: 14px;
  }

  .platforms,
  .downloads,
  .features,
  .guide,
  .news,
  .faq,
  .about,
  .contact {
    padding: 60px 0;
  }

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

  .device-tabs {
    overflow-x: auto;
    justify-content: flex-start;
    flex-wrap: nowrap;
    padding-bottom: 8px;
    margin: 0 -20px 24px;
    padding-left: 20px;
    padding-right: 20px;
  }

  .device-tab {
    flex-shrink: 0;
    padding: 10px 18px;
    font-size: 14px;
  }

  .download-info-bar {
    grid-template-columns: 1fr;
  }

  .download-item {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }

  .download-platform {
    min-width: auto;
  }

  .download-actions {
    width: 100%;
  }

  .download-actions .btn {
    flex: 1;
  }

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

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

  .steps-wrapper {
    padding-left: 20px;
  }

  .step-item {
    margin-left: 16px;
    padding: 20px;
  }

  .step-number {
    left: -46px;
    width: 32px;
    height: 32px;
    font-size: 14px;
  }

  .step-line {
    left: 15px;
  }

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

  .safety-header h2 {
    font-size: 26px;
  }

  .about-services {
    grid-template-columns: 1fr;
  }

  .contact-wrapper {
    grid-template-columns: 1fr;
  }

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

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

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

  .article-back {
    flex-direction: column;
  }

  .article-back .btn {
    width: 100%;
  }

  .cta-inner {
    flex-direction: column;
    text-align: center;
  }

  .cta-actions {
    flex-direction: column;
    width: 100%;
  }

  .cta-actions .btn {
    width: 100%;
  }

  .footer-links {
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
  }

  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }

  .back-to-top {
    bottom: 20px;
    right: 20px;
    width: 44px;
    height: 44px;
  }
}

@media (max-width: 480px) {
  .footer-links {
    grid-template-columns: 1fr;
  }

  .platform-card {
    padding: 20px;
  }

  .contact-form-wrapper {
    padding: 24px 20px;
  }

  .modal-content {
    padding: 32px 24px;
  }
}

/* ========== 减少动效偏好 ========== */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  html {
    scroll-behavior: auto;
  }
}