/* ============================================================
   USDT冷钱包 - 全局样式表
   现代科技感 | 深空蓝至极光紫渐变 | 磨砂玻璃效果
   ============================================================ */

/* CSS Variables */
:root {
  --primary-gradient: linear-gradient(135deg, #0a1628 0%, #1a0a3e 50%, #2d1b69 100%);
  --accent-blue: #00d4ff;
  --accent-purple: #8b5cf6;
  --accent-green: #10b981;
  --accent-gold: #f59e0b;
  --glass-bg: rgba(255, 255, 255, 0.05);
  --glass-border: rgba(255, 255, 255, 0.1);
  --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
  --text-primary: #ffffff;
  --text-secondary: rgba(255, 255, 255, 0.7);
  --text-muted: rgba(255, 255, 255, 0.5);
  --font-main: 'Inter', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --radius: 16px;
  --radius-sm: 8px;
  --radius-lg: 24px;
}

/* Reset & Base */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

body {
  font-family: var(--font-main);
  background: var(--primary-gradient);
  color: var(--text-primary);
  line-height: 1.7;
  min-height: 100vh;
  overflow-x: hidden;
  position: relative;
}

/* 背景网格线效果 */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image:
    linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
  background-size: 60px 60px;
  pointer-events: none;
  z-index: 0;
}

body > * {
  position: relative;
  z-index: 1;
}

a {
  color: var(--accent-blue);
  text-decoration: none;
  transition: color 0.3s ease;
}

a:hover {
  color: var(--accent-purple);
}

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

/* ============================================================
   磨砂玻璃卡片
   ============================================================ */
.glass-card {
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  box-shadow: var(--glass-shadow);
  padding: 24px;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.glass-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0, 212, 255, 0.15);
}

/* ============================================================
   导航栏
   ============================================================ */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: rgba(10, 22, 40, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--glass-border);
}

.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--text-primary);
}

.logo-icon {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: 8px;
}

.nav-menu a {
  color: var(--text-secondary);
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  transition: all 0.3s ease;
}

.nav-menu a:hover,
.nav-menu a.active {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.08);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 5px;
}

.nav-toggle span {
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  transition: all 0.3s ease;
}

/* ============================================================
   Hero 区域
   ============================================================ */
.hero-section {
  padding: 120px 20px 60px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero-section::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle at 30% 50%, rgba(0, 212, 255, 0.08) 0%, transparent 50%),
              radial-gradient(circle at 70% 50%, rgba(139, 92, 246, 0.08) 0%, transparent 50%);
  animation: heroGlow 8s ease-in-out infinite alternate;
  pointer-events: none;
}

@keyframes heroGlow {
  0% { transform: translate(0, 0) rotate(0deg); }
  100% { transform: translate(-5%, 5%) rotate(3deg); }
}

.hero-content {
  max-width: 800px;
  margin: 0 auto;
  position: relative;
}

.hero-badge {
  display: inline-block;
  padding: 6px 18px;
  background: rgba(0, 212, 255, 0.1);
  border: 1px solid rgba(0, 212, 255, 0.3);
  border-radius: 20px;
  font-size: 0.85rem;
  color: var(--accent-blue);
  margin-bottom: 24px;
}

.hero-title {
  font-size: 3rem;
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 20px;
  background: linear-gradient(135deg, #fff 0%, var(--accent-blue) 50%, var(--accent-purple) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 1.15rem;
  color: var(--text-secondary);
  margin-bottom: 36px;
  line-height: 1.8;
}

.hero-buttons {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
  color: #fff;
  border: none;
  border-radius: var(--radius);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  text-decoration: none;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0, 212, 255, 0.3);
  color: #fff;
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  text-decoration: none;
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.05);
  border-color: var(--accent-blue);
  color: #fff;
}

/* ============================================================
   搜索框
   ============================================================ */
.search-container {
  max-width: 600px;
  margin: 40px auto 0;
  position: relative;
}

.search-input {
  width: 100%;
  padding: 16px 50px 16px 20px;
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  color: var(--text-primary);
  font-size: 1rem;
  font-family: var(--font-main);
  outline: none;
  transition: border-color 0.3s ease;
}

.search-input::placeholder {
  color: var(--text-muted);
}

.search-input:focus {
  border-color: var(--accent-blue);
}

.search-btn {
  position: absolute;
  right: 8px;
  top: 50%;
  transform: translateY(-50%);
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
  border: none;
  border-radius: 10px;
  color: #fff;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
}

.search-result {
  margin-top: 12px;
  padding: 12px 20px;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-sm);
  color: var(--accent-green);
  font-size: 0.9rem;
  display: none;
}

/* ============================================================
   Section 通用
   ============================================================ */
.section {
  max-width: 1200px;
  margin: 0 auto;
  padding: 60px 20px;
}

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

.section-tag {
  display: inline-block;
  padding: 4px 14px;
  background: rgba(139, 92, 246, 0.1);
  border: 1px solid rgba(139, 92, 246, 0.3);
  border-radius: 16px;
  font-size: 0.8rem;
  color: var(--accent-purple);
  margin-bottom: 12px;
}

.section-title {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.section-desc {
  color: var(--text-secondary);
  font-size: 1rem;
  max-width: 600px;
  margin: 0 auto;
}

/* ============================================================
   仪表盘
   ============================================================ */
.dashboard-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-bottom: 40px;
}

.dashboard-item {
  text-align: center;
  padding: 28px 16px;
}

.dashboard-value {
  font-size: 2rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--accent-blue), var(--accent-green));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 8px;
  animation: countUp 2s ease-out;
}

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

.dashboard-label {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* ============================================================
   卡片网格
   ============================================================ */
.card-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

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

.card-grid-4 {
  grid-template-columns: repeat(4, 1fr);
}

.card-image {
  width: 100%;
  height: 200px;
  object-fit: cover;
  border-radius: var(--radius-sm);
  margin-bottom: 16px;
}

.card-tag {
  display: inline-block;
  padding: 3px 10px;
  background: rgba(0, 212, 255, 0.1);
  border: 1px solid rgba(0, 212, 255, 0.2);
  border-radius: 12px;
  font-size: 0.75rem;
  color: var(--accent-blue);
  margin-bottom: 10px;
}

.card-title {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 8px;
  line-height: 1.5;
}

.card-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

.card-meta {
  margin-top: 12px;
  font-size: 0.8rem;
  color: var(--text-muted);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

/* ============================================================
   视频卡片
   ============================================================ */
.video-card {
  position: relative;
  cursor: pointer;
  overflow: hidden;
  border-radius: var(--radius);
}

.video-card .card-image {
  margin-bottom: 0;
  border-radius: var(--radius) var(--radius) 0 0;
  transition: transform 0.3s ease;
}

.video-card:hover .card-image {
  transform: scale(1.05);
}

.video-play-btn {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 60px;
  height: 60px;
  background: rgba(0, 212, 255, 0.8);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity 0.3s ease;
  z-index: 2;
}

.video-play-btn::after {
  content: '';
  width: 0;
  height: 0;
  border-left: 18px solid #fff;
  border-top: 11px solid transparent;
  border-bottom: 11px solid transparent;
  margin-left: 4px;
}

.video-card:hover .video-play-btn {
  opacity: 1;
}

.video-info {
  padding: 16px;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-top: none;
  border-radius: 0 0 var(--radius) var(--radius);
}

/* ============================================================
   专家展示
   ============================================================ */
.expert-card {
  text-align: center;
}

.expert-avatar {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
  margin: 0 auto 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  font-weight: 700;
}

.expert-name {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 4px;
}

.expert-role {
  font-size: 0.85rem;
  color: var(--accent-blue);
  margin-bottom: 12px;
}

.expert-quote {
  font-size: 0.9rem;
  color: var(--text-secondary);
  font-style: italic;
  line-height: 1.7;
}

/* ============================================================
   用户口碑
   ============================================================ */
.review-stars {
  color: var(--accent-gold);
  margin-bottom: 12px;
  font-size: 1.1rem;
}

.review-text {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 16px;
}

.review-author {
  display: flex;
  align-items: center;
  gap: 12px;
}

.review-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent-green), var(--accent-blue));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.9rem;
  font-weight: 600;
}

.review-info {
  font-size: 0.85rem;
}

.review-name {
  font-weight: 600;
  margin-bottom: 2px;
}

.review-date {
  color: var(--text-muted);
  font-size: 0.8rem;
}

/* ============================================================
   互动分享
   ============================================================ */
.share-buttons {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  justify-content: center;
  margin-top: 24px;
}

.share-btn {
  padding: 10px 24px;
  border-radius: var(--radius);
  border: 1px solid var(--glass-border);
  background: var(--glass-bg);
  color: var(--text-primary);
  cursor: pointer;
  font-size: 0.9rem;
  transition: all 0.3s ease;
}

.share-btn:hover {
  background: rgba(0, 212, 255, 0.1);
  border-color: var(--accent-blue);
}

/* ============================================================
   步骤条 (Guide页面)
   ============================================================ */
.steps-container {
  max-width: 800px;
  margin: 0 auto;
}

.step-item {
  display: flex;
  gap: 24px;
  margin-bottom: 32px;
  cursor: pointer;
}

.step-number {
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  font-weight: 700;
}

.step-content {
  flex: 1;
}

.step-title {
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.step-detail {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.7;
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, padding 0.4s ease;
}

.step-item.active .step-detail {
  max-height: 500px;
  padding-top: 8px;
}

.step-item.active .step-number {
  box-shadow: 0 0 20px rgba(0, 212, 255, 0.4);
}

/* ============================================================
   面包屑
   ============================================================ */
.breadcrumb {
  padding: 90px 20px 0;
  max-width: 1200px;
  margin: 0 auto;
  font-size: 0.85rem;
  color: var(--text-muted);
}

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

.breadcrumb a:hover {
  color: var(--accent-blue);
}

.breadcrumb span {
  margin: 0 8px;
}

/* ============================================================
   内页内容区
   ============================================================ */
.page-content {
  max-width: 900px;
  margin: 0 auto;
  padding: 40px 20px 60px;
}

.page-content h1 {
  font-size: 2.2rem;
  font-weight: 800;
  margin-bottom: 24px;
  line-height: 1.3;
}

.page-content h2 {
  font-size: 1.6rem;
  font-weight: 700;
  margin: 36px 0 16px;
  color: var(--accent-blue);
}

.page-content h3 {
  font-size: 1.3rem;
  font-weight: 600;
  margin: 28px 0 12px;
}

.page-content h4 {
  font-size: 1.1rem;
  font-weight: 600;
  margin: 24px 0 10px;
  color: var(--accent-purple);
}

.page-content p {
  margin-bottom: 16px;
  color: var(--text-secondary);
  line-height: 1.8;
}

.page-content ul, .page-content ol {
  margin: 16px 0;
  padding-left: 24px;
  color: var(--text-secondary);
}

.page-content li {
  margin-bottom: 8px;
  line-height: 1.7;
}

.page-content blockquote {
  margin: 24px 0;
  padding: 16px 24px;
  background: var(--glass-bg);
  border-left: 3px solid var(--accent-blue);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--text-secondary);
  font-style: italic;
}

.content-image {
  width: 100%;
  max-height: 400px;
  object-fit: cover;
  border-radius: var(--radius);
  margin: 24px 0;
}

/* ============================================================
   安全指标条
   ============================================================ */
.security-meter {
  margin: 24px 0;
}

.meter-label {
  display: flex;
  justify-content: space-between;
  margin-bottom: 8px;
  font-size: 0.9rem;
}

.meter-bar {
  height: 8px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 4px;
  overflow: hidden;
}

.meter-fill {
  height: 100%;
  border-radius: 4px;
  background: linear-gradient(90deg, var(--accent-green), var(--accent-blue));
  transition: width 1.5s ease;
}

/* ============================================================
   页脚
   ============================================================ */
.site-footer {
  background: rgba(5, 10, 20, 0.8);
  backdrop-filter: blur(10px);
  border-top: 1px solid var(--glass-border);
  padding: 48px 20px 24px;
  margin-top: 60px;
}

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

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}

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

.footer-desc {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.7;
}

.footer-title {
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 16px;
  color: var(--text-primary);
}

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

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

.footer-links a {
  color: var(--text-muted);
  font-size: 0.9rem;
  transition: color 0.3s ease;
}

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

.footer-bottom {
  border-top: 1px solid var(--glass-border);
  padding-top: 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.footer-update {
  color: var(--accent-blue);
}

/* ============================================================
   响应式
   ============================================================ */
@media (max-width: 1024px) {
  .dashboard-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .card-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .card-grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .nav-menu {
    display: none;
    position: absolute;
    top: 70px;
    left: 0;
    width: 100%;
    flex-direction: column;
    background: rgba(10, 22, 40, 0.95);
    backdrop-filter: blur(20px);
    padding: 20px;
    border-bottom: 1px solid var(--glass-border);
  }
  .nav-menu.active {
    display: flex;
  }
  .nav-toggle {
    display: flex;
  }
  .hero-title {
    font-size: 2rem;
  }
  .hero-subtitle {
    font-size: 1rem;
  }
  .dashboard-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
  }
  .dashboard-value {
    font-size: 1.5rem;
  }
  .card-grid,
  .card-grid-2,
  .card-grid-4 {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }
  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
  .section-title {
    font-size: 1.5rem;
  }
  .hero-buttons {
    flex-direction: column;
    align-items: center;
  }
  .step-item {
    gap: 16px;
  }
  .page-content h1 {
    font-size: 1.6rem;
  }
}

@media (max-width: 480px) {
  .header-inner {
    height: 60px;
  }
  .hero-section {
    padding: 90px 16px 40px;
  }
  .hero-title {
    font-size: 1.6rem;
  }
  .glass-card {
    padding: 16px;
  }
  .section {
    padding: 40px 16px;
  }
  .dashboard-grid {
    grid-template-columns: 1fr 1fr;
    gap: 8px;
  }
  .dashboard-item {
    padding: 16px 8px;
  }
  .dashboard-value {
    font-size: 1.2rem;
  }
}

/* ============================================================
   懒加载
   ============================================================ */
.lazy-load {
  opacity: 1;
  transform: translateY(0);
  animation: fadeInUp 0.6s ease both;
}

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

.lazy-load.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ============================================================
   动画
   ============================================================ */
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

@keyframes slideUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}

.animate-pulse {
  animation: pulse 2s ease-in-out infinite;
}

.animate-slideUp {
  animation: slideUp 0.6s ease-out;
}

/* Security status indicator */
.status-dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  margin-right: 6px;
  animation: pulse 2s ease-in-out infinite;
}

.status-dot.green { background: var(--accent-green); }
.status-dot.yellow { background: var(--accent-gold); }
.status-dot.red { background: #ef4444; }

/* Forum specific */
.forum-post {
  padding: 20px;
  border-bottom: 1px solid var(--glass-border);
}

.forum-post:last-child {
  border-bottom: none;
}

.forum-meta {
  display: flex;
  gap: 16px;
  margin-top: 12px;
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* Market ticker */
.ticker-bar {
  display: flex;
  gap: 24px;
  padding: 12px 20px;
  background: rgba(0, 0, 0, 0.3);
  border-radius: var(--radius-sm);
  overflow-x: auto;
  margin-bottom: 32px;
}

.ticker-item {
  display: flex;
  align-items: center;
  gap: 8px;
  white-space: nowrap;
  font-size: 0.9rem;
}

.ticker-change {
  font-weight: 600;
}

.ticker-change.up { color: var(--accent-green); }
.ticker-change.down { color: #ef4444; }