/* =========================================
   比特浏览器官网模板 - 主样式文件
   遵循谷歌SEO/GEO标准设计规范
   ========================================= */

/* ---- CSS变量 ---- */
:root {
  --primary: #3b5bfc;
  --primary-dark: #2a44e0;
  --primary-light: #eef0ff;
  --secondary: #6c5ce7;
  --accent: #00cec9;
  --text-primary: #1a1a2e;
  --text-secondary: #4a4a6a;
  --text-muted: #8888aa;
  --bg-white: #ffffff;
  --bg-light: #f7f8ff;
  --bg-dark: #0d1b4b;
  --border: #e5e8f5;
  --shadow: 0 4px 20px rgba(59, 91, 252, 0.1);
  --shadow-lg: 0 8px 40px rgba(59, 91, 252, 0.15);
  --radius: 12px;
  --radius-lg: 20px;
  --transition: all 0.3s ease;
  --font-main: -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-main);
  color: var(--text-primary);
  background: var(--bg-white);
  line-height: 1.6;
  overflow-x: hidden;
}

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

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

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

ul, ol {
  list-style: none;
}

/* ---- 容器 ---- */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

.container-wide {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 30px;
}

/* ---- 按钮 ---- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: 8px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  border: none;
  text-decoration: none;
  white-space: nowrap;
}

.btn-primary {
  background: var(--primary);
  color: #fff;
  box-shadow: 0 4px 15px rgba(59, 91, 252, 0.35);
}

.btn-primary:hover {
  background: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(59, 91, 252, 0.45);
  color: #fff;
}

.btn-outline {
  background: transparent;
  color: var(--primary);
  border: 2px solid var(--primary);
}

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

.btn-white {
  background: #fff;
  color: var(--primary);
  box-shadow: 0 4px 15px rgba(0,0,0,0.1);
}

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

.btn-lg {
  padding: 15px 36px;
  font-size: 16px;
  border-radius: 10px;
}

/* ---- 标签/徽章 ---- */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  background: var(--primary-light);
  color: var(--primary);
  border-radius: 20px;
  font-size: 13px;
  font-weight: 600;
}

/* ---- 标题样式 ---- */
.section-title {
  font-size: 36px;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.3;
  margin-bottom: 16px;
}

.section-subtitle {
  font-size: 17px;
  color: var(--text-secondary);
  line-height: 1.7;
  max-width: 640px;
  margin: 0 auto 48px;
}

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

/* ---- 导航栏 ---- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
  transition: var(--transition);
}

.site-header.scrolled {
  box-shadow: 0 2px 20px rgba(0,0,0,0.08);
}

.nav-wrapper {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.nav-logo img {
  height: 36px;
  width: auto;
}

.nav-logo-text {
  font-size: 20px;
  font-weight: 700;
  color: var(--primary);
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-item {
  position: relative;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 8px 14px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-primary);
  border-radius: 6px;
  transition: var(--transition);
}

.nav-link:hover,
.nav-link.active {
  color: var(--primary);
  background: var(--primary-light);
}

.nav-link svg {
  width: 12px;
  height: 12px;
  transition: transform 0.2s;
}

.nav-item:hover .nav-link svg {
  transform: rotate(180deg);
}

/* 下拉菜单 */
.nav-dropdown {
  position: absolute;
  top: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%);
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  padding: 8px;
  min-width: 180px;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
  pointer-events: none;
}

.nav-item:hover .nav-dropdown {
  opacity: 1;
  visibility: visible;
  pointer-events: all;
  transform: translateX(-50%) translateY(0);
}

.nav-dropdown a {
  display: block;
  padding: 10px 16px;
  font-size: 14px;
  color: var(--text-primary);
  border-radius: 6px;
  transition: var(--transition);
}

.nav-dropdown a:hover {
  background: var(--primary-light);
  color: var(--primary);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.nav-register {
  padding: 9px 22px;
  font-size: 14px;
}

/* 移动端汉堡菜单 */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
}

.nav-toggle span {
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: var(--transition);
}

/* ---- Hero区域 ---- */
.hero-section {
  background: linear-gradient(135deg, #0d1b4b 0%, #1a2d7a 40%, #2a44e0 100%);
  min-height: 580px;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
  padding: 80px 0 60px;
}

.hero-section::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -10%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(59,91,252,0.3) 0%, transparent 70%);
  pointer-events: none;
}

.hero-section::after {
  content: '';
  position: absolute;
  bottom: -30%;
  left: -5%;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(0,206,201,0.15) 0%, transparent 70%);
  pointer-events: none;
}

.hero-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
  position: relative;
  z-index: 2;
}

.hero-text {
  color: #fff;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(255,255,255,0.15);
  border: 1px solid rgba(255,255,255,0.25);
  color: #fff;
  padding: 6px 16px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 500;
  margin-bottom: 24px;
  backdrop-filter: blur(5px);
}

.hero-badge span {
  width: 6px;
  height: 6px;
  background: #00cec9;
  border-radius: 50%;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(1.3); }
}

.hero-title {
  font-size: 52px;
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 16px;
  letter-spacing: -0.5px;
}

.hero-title .highlight {
  background: linear-gradient(90deg, #00cec9, #74b9ff);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 18px;
  color: rgba(255,255,255,0.8);
  margin-bottom: 36px;
  line-height: 1.6;
}

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 40px;
}

.hero-stats {
  display: flex;
  gap: 32px;
}

.hero-stat {
  text-align: center;
}

.hero-stat-num {
  font-size: 28px;
  font-weight: 800;
  color: #fff;
  line-height: 1;
}

.hero-stat-label {
  font-size: 13px;
  color: rgba(255,255,255,0.65);
  margin-top: 4px;
}

.hero-visual {
  position: relative;
}

.hero-img-main {
  border-radius: var(--radius-lg);
  box-shadow: 0 20px 60px rgba(0,0,0,0.4);
  width: 100%;
}

.hero-floating-card {
  position: absolute;
  background: rgba(255,255,255,0.12);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255,255,255,0.2);
  border-radius: 12px;
  padding: 12px 18px;
  color: #fff;
  font-size: 13px;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 8px;
  animation: float 3s ease-in-out infinite;
}

.hero-floating-card:nth-child(2) { animation-delay: 0.5s; }
.hero-floating-card:nth-child(3) { animation-delay: 1s; }

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

.hero-floating-card.card-1 {
  top: 15%;
  right: -5%;
}

.hero-floating-card.card-2 {
  bottom: 20%;
  left: -8%;
}

/* ---- 轮播图 ---- */
.slider-section {
  background: var(--bg-light);
  padding: 60px 0;
}

.slider-wrapper {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
}

.slider-track {
  display: flex;
  transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.slide {
  min-width: 100%;
  position: relative;
}

.slide img {
  width: 100%;
  height: 400px;
  object-fit: cover;
}

.slide-caption {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  background: linear-gradient(transparent, rgba(13,27,75,0.85));
  padding: 40px 48px 32px;
  color: #fff;
}

.slide-caption h3 {
  font-size: 26px;
  font-weight: 700;
  margin-bottom: 8px;
}

.slide-caption p {
  font-size: 15px;
  opacity: 0.85;
}

.slider-controls {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  margin-top: 24px;
}

.slider-btn {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: #fff;
  border: 1px solid var(--border);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
  box-shadow: var(--shadow);
}

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

.slider-btn svg {
  width: 18px;
  height: 18px;
}

.slider-dots {
  display: flex;
  gap: 8px;
}

.slider-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--border);
  cursor: pointer;
  transition: var(--transition);
}

.slider-dot.active {
  width: 24px;
  border-radius: 4px;
  background: var(--primary);
}

/* ---- 合作伙伴/信任标志 ---- */
.trust-section {
  padding: 40px 0;
  border-bottom: 1px solid var(--border);
}

.trust-label {
  text-align: center;
  font-size: 13px;
  color: var(--text-muted);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 24px;
}

.trust-logos {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 48px;
  flex-wrap: wrap;
}

.trust-logos img {
  height: 32px;
  width: auto;
  opacity: 0.6;
  filter: grayscale(100%);
  transition: var(--transition);
}

.trust-logos img:hover {
  opacity: 1;
  filter: none;
}

/* ---- 功能特性区 ---- */
.features-section {
  padding: 96px 0;
  background: var(--bg-white);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.feature-card {
  background: var(--bg-light);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 36px 28px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  opacity: 0;
  transition: var(--transition);
}

.feature-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary);
}

.feature-card:hover::before {
  opacity: 1;
}

.feature-icon {
  width: 56px;
  height: 56px;
  background: var(--primary-light);
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
}

.feature-icon img {
  width: 28px;
  height: 28px;
}

.feature-icon svg {
  width: 28px;
  height: 28px;
  color: var(--primary);
}

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

.feature-card p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ---- 指纹参数展示 ---- */
.fingerprint-section {
  padding: 96px 0;
  background: var(--bg-light);
}

.fingerprint-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}

.fingerprint-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.fp-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary);
  transition: var(--transition);
  cursor: default;
}

.fp-tag:hover {
  border-color: var(--primary);
  color: var(--primary);
  background: var(--primary-light);
  transform: scale(1.03);
}

.fp-tag-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
}

/* ---- 生态模块 ---- */
.ecology-section {
  padding: 96px 0;
  background: var(--bg-white);
}

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

.ecology-card {
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border);
  transition: var(--transition);
  background: var(--bg-white);
}

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

.ecology-card-img {
  width: 100%;
  height: 200px;
  object-fit: cover;
}

.ecology-card-body {
  padding: 24px;
}

.ecology-card-body h3 {
  font-size: 17px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.ecology-card-body p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ---- 用户评价 ---- */
.testimonials-section {
  padding: 96px 0;
  background: linear-gradient(135deg, #0d1b4b 0%, #1a2d7a 100%);
  color: #fff;
}

.testimonials-section .section-title {
  color: #fff;
}

.testimonials-section .section-subtitle {
  color: rgba(255,255,255,0.7);
}

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

.testimonial-card {
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.15);
  border-radius: var(--radius-lg);
  padding: 32px;
  backdrop-filter: blur(10px);
  transition: var(--transition);
}

.testimonial-card:hover {
  background: rgba(255,255,255,0.12);
  transform: translateY(-4px);
}

.testimonial-stars {
  display: flex;
  gap: 4px;
  margin-bottom: 16px;
}

.testimonial-stars svg {
  width: 16px;
  height: 16px;
  fill: #ffd700;
  color: #ffd700;
}

.testimonial-text {
  font-size: 14px;
  line-height: 1.7;
  color: rgba(255,255,255,0.85);
  margin-bottom: 24px;
}

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

.testimonial-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid rgba(255,255,255,0.3);
}

.testimonial-name {
  font-size: 15px;
  font-weight: 700;
  color: #fff;
}

.testimonial-role {
  font-size: 12px;
  color: rgba(255,255,255,0.6);
}

/* ---- 文章资讯 ---- */
.news-section {
  padding: 96px 0;
  background: var(--bg-light);
}

.news-tabs {
  display: flex;
  gap: 8px;
  margin-bottom: 40px;
  border-bottom: 1px solid var(--border);
  padding-bottom: 0;
}

.news-tab {
  padding: 10px 24px;
  font-size: 15px;
  font-weight: 600;
  color: var(--text-secondary);
  cursor: pointer;
  border-bottom: 3px solid transparent;
  margin-bottom: -1px;
  transition: var(--transition);
}

.news-tab.active,
.news-tab:hover {
  color: var(--primary);
  border-bottom-color: var(--primary);
}

.news-list {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.news-item {
  display: flex;
  align-items: flex-start;
  gap: 20px;
  padding: 20px 0;
  border-bottom: 1px solid var(--border);
  transition: var(--transition);
}

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

.news-item:hover .news-item-title {
  color: var(--primary);
}

.news-item-img {
  width: 120px;
  height: 80px;
  object-fit: cover;
  border-radius: 8px;
  flex-shrink: 0;
  background: var(--primary-light);
}

.news-item-body {
  flex: 1;
}

.news-item-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 6px;
  line-height: 1.4;
  transition: var(--transition);
}

.news-item-excerpt {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.news-item-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 8px;
  font-size: 12px;
  color: var(--text-muted);
}

.news-more {
  text-align: center;
  margin-top: 36px;
}

/* ---- FAQ区域 ---- */
.faq-section {
  padding: 96px 0;
  background: var(--bg-white);
}

.faq-list {
  max-width: 800px;
  margin: 0 auto;
}

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

.faq-item.open {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(59,91,252,0.08);
}

.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px;
  cursor: pointer;
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
  transition: var(--transition);
}

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

.faq-icon {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--primary-light);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: var(--transition);
}

.faq-item.open .faq-icon {
  background: var(--primary);
  transform: rotate(45deg);
}

.faq-icon svg {
  width: 14px;
  height: 14px;
  color: var(--primary);
}

.faq-item.open .faq-icon svg {
  color: #fff;
}

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

.faq-item.open .faq-answer {
  max-height: 400px;
}

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

/* ---- CTA区域 ---- */
.cta-section {
  padding: 80px 0;
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  text-align: center;
  color: #fff;
}

.cta-section h2 {
  font-size: 40px;
  font-weight: 800;
  margin-bottom: 16px;
}

.cta-section p {
  font-size: 18px;
  opacity: 0.85;
  margin-bottom: 36px;
}

.cta-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

/* ---- 页脚 ---- */
.site-footer {
  background: #0a1128;
  color: rgba(255,255,255,0.7);
  padding: 64px 0 0;
}

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

.footer-brand img {
  height: 36px;
  margin-bottom: 16px;
  filter: brightness(0) invert(1);
}

.footer-brand p {
  font-size: 14px;
  line-height: 1.7;
  margin-bottom: 24px;
}

.footer-social {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.footer-social a {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  background: rgba(255,255,255,0.08);
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(255,255,255,0.7);
  transition: var(--transition);
  font-size: 14px;
}

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

.footer-col h4 {
  font-size: 15px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 20px;
}

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

.footer-col ul li a {
  font-size: 14px;
  color: rgba(255,255,255,0.6);
  transition: var(--transition);
}

.footer-col ul li a:hover {
  color: #fff;
  padding-left: 4px;
}

.footer-bottom {
  padding: 20px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

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

.footer-links {
  display: flex;
  gap: 20px;
}

.footer-links a {
  font-size: 13px;
  color: rgba(255,255,255,0.4);
  transition: var(--transition);
}

.footer-links a:hover {
  color: rgba(255,255,255,0.8);
}

/* ---- 面包屑 ---- */
.breadcrumb {
  padding: 16px 0;
  font-size: 13px;
  color: var(--text-muted);
}

.breadcrumb ol {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.breadcrumb li {
  display: flex;
  align-items: center;
  gap: 8px;
}

.breadcrumb li:not(:last-child)::after {
  content: '/';
  color: var(--border);
}

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

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

.breadcrumb li:last-child {
  color: var(--text-primary);
  font-weight: 500;
}

/* ---- 列表页 ---- */
.page-hero {
  background: linear-gradient(135deg, #0d1b4b 0%, #1a2d7a 100%);
  padding: 60px 0 48px;
  color: #fff;
}

.page-hero h1 {
  font-size: 38px;
  font-weight: 800;
  margin-bottom: 12px;
}

.page-hero p {
  font-size: 16px;
  opacity: 0.8;
}

.list-layout {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 40px;
  padding: 48px 0;
}

.article-list {
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.article-card {
  display: flex;
  gap: 24px;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
  transition: var(--transition);
}

.article-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary);
}

.article-card-img {
  width: 200px;
  height: 130px;
  object-fit: cover;
  border-radius: 10px;
  flex-shrink: 0;
  background: var(--primary-light);
}

.article-card-body {
  flex: 1;
}

.article-card-category {
  display: inline-block;
  padding: 3px 10px;
  background: var(--primary-light);
  color: var(--primary);
  border-radius: 4px;
  font-size: 12px;
  font-weight: 600;
  margin-bottom: 10px;
}

.article-card-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 10px;
  line-height: 1.4;
  transition: var(--transition);
}

.article-card:hover .article-card-title {
  color: var(--primary);
}

.article-card-excerpt {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.6;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin-bottom: 12px;
}

.article-card-meta {
  display: flex;
  align-items: center;
  gap: 16px;
  font-size: 12px;
  color: var(--text-muted);
}

/* 侧边栏 */
.sidebar {
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.sidebar-widget {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
}

.sidebar-widget h3 {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--primary-light);
}

.sidebar-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.sidebar-list li a {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 14px;
  color: var(--text-secondary);
  transition: var(--transition);
  line-height: 1.4;
}

.sidebar-list li a:hover {
  color: var(--primary);
}

.sidebar-list li a::before {
  content: '›';
  color: var(--primary);
  font-weight: 700;
  flex-shrink: 0;
  margin-top: 1px;
}

/* 分页 */
.pagination {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  margin-top: 40px;
}

.page-btn {
  min-width: 40px;
  height: 40px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  font-weight: 600;
  border: 1px solid var(--border);
  color: var(--text-secondary);
  background: #fff;
  cursor: pointer;
  transition: var(--transition);
  text-decoration: none;
}

.page-btn:hover,
.page-btn.active {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
}

/* ---- 内容页 ---- */
.article-layout {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 40px;
  padding: 48px 0;
}

.article-main {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 40px;
}

.article-header {
  margin-bottom: 32px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border);
}

.article-header h1 {
  font-size: 32px;
  font-weight: 800;
  color: var(--text-primary);
  line-height: 1.3;
  margin-bottom: 16px;
}

.article-meta {
  display: flex;
  align-items: center;
  gap: 20px;
  font-size: 13px;
  color: var(--text-muted);
  flex-wrap: wrap;
}

.article-meta-item {
  display: flex;
  align-items: center;
  gap: 5px;
}

.article-cover {
  width: 100%;
  height: 360px;
  object-fit: cover;
  border-radius: var(--radius);
  margin-bottom: 32px;
}

.article-content {
  font-size: 16px;
  line-height: 1.85;
  color: var(--text-secondary);
}

.article-content h2 {
  font-size: 24px;
  font-weight: 700;
  color: var(--text-primary);
  margin: 36px 0 16px;
}

.article-content h3 {
  font-size: 20px;
  font-weight: 700;
  color: var(--text-primary);
  margin: 28px 0 12px;
}

.article-content p {
  margin-bottom: 18px;
}

.article-content ul,
.article-content ol {
  margin: 16px 0 20px 24px;
}

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

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

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

.article-content a {
  color: var(--primary);
  text-decoration: underline;
}

.article-content blockquote {
  border-left: 4px solid var(--primary);
  background: var(--primary-light);
  padding: 16px 20px;
  border-radius: 0 8px 8px 0;
  margin: 24px 0;
  font-style: italic;
  color: var(--text-primary);
}

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

.article-content code {
  background: var(--bg-light);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 14px;
  font-family: 'Courier New', monospace;
}

.article-content pre {
  background: #1a1a2e;
  color: #e0e0e0;
  padding: 20px;
  border-radius: var(--radius);
  overflow-x: auto;
  margin: 20px 0;
}

.article-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 32px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
}

.article-tag {
  padding: 5px 14px;
  background: var(--bg-light);
  border: 1px solid var(--border);
  border-radius: 20px;
  font-size: 13px;
  color: var(--text-secondary);
  transition: var(--transition);
}

.article-tag:hover {
  border-color: var(--primary);
  color: var(--primary);
  background: var(--primary-light);
}

/* 相关文章 */
.related-articles {
  margin-top: 40px;
}

.related-articles h3 {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 20px;
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.related-card {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: var(--transition);
}

.related-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow);
}

.related-card-img {
  width: 100%;
  height: 120px;
  object-fit: cover;
  background: var(--primary-light);
}

.related-card-body {
  padding: 14px;
}

.related-card-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* ---- 下载页 ---- */
.download-hero {
  background: linear-gradient(135deg, #0d1b4b 0%, #1a2d7a 100%);
  padding: 80px 0;
  text-align: center;
  color: #fff;
}

.download-hero h1 {
  font-size: 44px;
  font-weight: 800;
  margin-bottom: 16px;
}

.download-hero p {
  font-size: 18px;
  opacity: 0.8;
  margin-bottom: 0;
}

.download-section {
  padding: 80px 0;
  background: var(--bg-light);
}

.download-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  margin-bottom: 60px;
}

.download-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 40px 32px;
  text-align: center;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.download-card.featured {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(59,91,252,0.1);
}

.download-card.featured::before {
  content: '推荐';
  position: absolute;
  top: 16px;
  right: 16px;
  background: var(--primary);
  color: #fff;
  font-size: 12px;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: 20px;
}

.download-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
}

.download-card-icon {
  font-size: 56px;
  margin-bottom: 20px;
  display: block;
}

.download-card h3 {
  font-size: 22px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 12px;
}

.download-card-specs {
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 24px;
  line-height: 1.6;
}

.download-card-specs span {
  display: block;
}

.download-btn-group {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.download-version {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 16px;
  background: var(--bg-light);
  border-radius: 8px;
  font-size: 13px;
  color: var(--text-secondary);
  cursor: pointer;
  transition: var(--transition);
}

.download-version:hover {
  background: var(--primary-light);
  color: var(--primary);
}

.download-version-main {
  background: var(--primary);
  color: #fff;
  border-radius: 8px;
  padding: 12px 20px;
  font-size: 15px;
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  cursor: pointer;
  transition: var(--transition);
  text-decoration: none;
}

.download-version-main:hover {
  background: var(--primary-dark);
  color: #fff;
  transform: translateY(-2px);
}

/* 更新日志 */
.changelog-section {
  padding: 80px 0;
  background: var(--bg-white);
}

.changelog-list {
  max-width: 800px;
  margin: 0 auto;
}

.changelog-item {
  display: flex;
  gap: 24px;
  padding: 28px 0;
  border-bottom: 1px solid var(--border);
}

.changelog-version {
  flex-shrink: 0;
  width: 100px;
}

.changelog-version-num {
  font-size: 16px;
  font-weight: 700;
  color: var(--primary);
}

.changelog-version-date {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 4px;
}

.changelog-content h4 {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 10px;
}

.changelog-content ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.changelog-content ul li {
  font-size: 14px;
  color: var(--text-secondary);
  display: flex;
  align-items: flex-start;
  gap: 8px;
}

.changelog-content ul li::before {
  content: '✓';
  color: var(--accent);
  font-weight: 700;
  flex-shrink: 0;
}

/* 安全认证 */
.security-section {
  padding: 60px 0;
  background: var(--bg-light);
  text-align: center;
}

.security-logos {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 40px;
  flex-wrap: wrap;
  margin-top: 32px;
}

.security-logo-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}

.security-logo-icon {
  width: 56px;
  height: 56px;
  border-radius: 12px;
  background: #fff;
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
}

.security-logo-name {
  font-size: 12px;
  color: var(--text-muted);
  font-weight: 500;
}

/* ---- 响应式 ---- */
@media (max-width: 1024px) {
  .hero-title { font-size: 40px; }
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .testimonials-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .ecology-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .nav-menu { display: none; }
  .nav-menu.open { 
    display: flex; 
    flex-direction: column;
    position: fixed;
    top: 68px;
    left: 0;
    right: 0;
    background: #fff;
    padding: 20px;
    box-shadow: var(--shadow-lg);
    z-index: 999;
    gap: 4px;
  }
  .nav-toggle { display: flex; }
  
  .hero-content { grid-template-columns: 1fr; }
  .hero-visual { display: none; }
  .hero-title { font-size: 32px; }
  .hero-subtitle { font-size: 16px; }
  
  .features-grid { grid-template-columns: 1fr; }
  .fingerprint-content { grid-template-columns: 1fr; }
  .testimonials-grid { grid-template-columns: 1fr; }
  .ecology-grid { grid-template-columns: 1fr; }
  .download-cards { grid-template-columns: 1fr; }
  
  .list-layout,
  .article-layout { grid-template-columns: 1fr; }
  .sidebar { display: none; }
  
  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; text-align: center; }
  
  .section-title { font-size: 26px; }
  .related-grid { grid-template-columns: 1fr; }
  
  .article-card { flex-direction: column; }
  .article-card-img { width: 100%; height: 180px; }
}

@media (max-width: 480px) {
  .hero-actions { flex-direction: column; }
  .cta-actions { flex-direction: column; align-items: center; }
  .hero-stats { gap: 20px; }
}

/* ---- 工具类 ---- */
.text-center { text-align: center; }
.text-left { text-align: left; }
.mt-8 { margin-top: 8px; }
.mt-16 { margin-top: 16px; }
.mt-24 { margin-top: 24px; }
.mt-32 { margin-top: 32px; }
.mb-8 { margin-bottom: 8px; }
.mb-16 { margin-bottom: 16px; }
.mb-24 { margin-bottom: 24px; }
.mb-32 { margin-bottom: 32px; }
.hidden { display: none; }
.flex { display: flex; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-8 { gap: 8px; }
.gap-16 { gap: 16px; }

/* ---- 动画 ---- */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ---- 滚动条 ---- */
::-webkit-scrollbar {
  width: 6px;
}

::-webkit-scrollbar-track {
  background: var(--bg-light);
}

::-webkit-scrollbar-thumb {
  background: var(--primary);
  border-radius: 3px;
}

/* ---- 选中样式 ---- */
::selection {
  background: rgba(59,91,252,0.2);
  color: var(--text-primary);
}