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

:root {
  --primary: #e94560;
  --primary-light: #ff6b6b;
  --secondary: #0f3460;
  --bg: #1a1a2e;
  --glass: rgba(255, 255, 255, 0.05);
  --glass-hover: rgba(255, 255, 255, 0.10);
  --text: #f0f0f0;
  --text-muted: rgba(255, 255, 255, 0.6);
  --radius: 16px;
  --radius-sm: 12px;
  --shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
  --shadow-hover: 0 12px 40px rgba(0, 0, 0, 0.4);
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --gradient-banner: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
  --gradient-accent: linear-gradient(135deg, #e94560, #ff6b6b);
  --border-glass: 1px solid rgba(255, 255, 255, 0.1);
  --border-glass-strong: 1px solid rgba(255, 255, 255, 0.15);
  --nav-bg: rgba(26, 26, 46, 0.85);
  --footer-bg: rgba(0, 0, 0, 0.3);
}

.dark {
  --bg: #0d0d1a;
  --text: #e0e0e0;
  --text-muted: rgba(224, 224, 224, 0.6);
  --glass: rgba(255, 255, 255, 0.03);
  --glass-hover: rgba(255, 255, 255, 0.06);
  --gradient-banner: linear-gradient(135deg, #0d0d1a 0%, #111128 50%, #0a0a1f 100%);
  --nav-bg: rgba(13, 13, 26, 0.9);
  --footer-bg: rgba(0, 0, 0, 0.5);
  --border-glass: 1px solid rgba(255, 255, 255, 0.06);
  --border-glass-strong: 1px solid rgba(255, 255, 255, 0.10);
  --shadow: 0 8px 32px rgba(0, 0, 0, 0.5);
  --shadow-hover: 0 12px 40px rgba(0, 0, 0, 0.6);
}

html {
  scroll-behavior: smooth;
  -webkit-tap-highlight-color: transparent;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Helvetica Neue', Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  transition: background var(--transition), color var(--transition);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

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

ul {
  list-style: none;
}

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

/* ===== 玻璃效果 ===== */
.glass {
  background: var(--glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: var(--border-glass);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  transition: background var(--transition), border var(--transition), box-shadow var(--transition), transform var(--transition);
}

.glass:hover {
  background: var(--glass-hover);
  border-color: var(--border-glass-strong);
  box-shadow: var(--shadow-hover);
}

/* ===== 按钮 ===== */
.btn {
  display: inline-block;
  padding: 14px 32px;
  background: var(--gradient-accent);
  color: #fff;
  border-radius: 30px;
  font-weight: 600;
  font-size: 1rem;
  letter-spacing: 0.5px;
  transition: transform var(--transition), box-shadow var(--transition), filter var(--transition);
  cursor: pointer;
  border: none;
  text-align: center;
  position: relative;
  overflow: hidden;
  box-shadow: 0 4px 15px rgba(233, 69, 96, 0.3);
}

.btn::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255,255,255,0.2), transparent);
  opacity: 0;
  transition: opacity var(--transition);
}

.btn:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 25px rgba(233, 69, 96, 0.45);
  filter: brightness(1.05);
}

.btn:hover::after {
  opacity: 1;
}

.btn:active {
  transform: translateY(-1px);
  box-shadow: 0 4px 15px rgba(233, 69, 96, 0.3);
}

/* ===== 区块通用 ===== */
.section {
  padding: 100px 0;
  position: relative;
}

.section:nth-child(even) {
  background: rgba(0, 0, 0, 0.15);
}

.dark .section:nth-child(even) {
  background: rgba(255, 255, 255, 0.02);
}

/* ===== 标题系统 ===== */
h1 {
  font-size: clamp(2rem, 5vw, 3.2rem);
  font-weight: 800;
  margin-bottom: 20px;
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.2;
  letter-spacing: -0.5px;
}

h2 {
  font-size: clamp(1.6rem, 3.5vw, 2.4rem);
  font-weight: 700;
  margin-bottom: 40px;
  text-align: center;
  position: relative;
  color: var(--text);
  letter-spacing: 0.5px;
}

h2::after {
  content: '';
  display: block;
  width: 70px;
  height: 4px;
  background: var(--gradient-accent);
  margin: 16px auto 0;
  border-radius: 4px;
  transition: width 0.5s ease;
}

h2:hover::after {
  width: 100px;
}

h3 {
  font-size: 1.3rem;
  font-weight: 600;
  margin-bottom: 12px;
  color: var(--text);
  letter-spacing: 0.3px;
}

/* ===== 网格布局 ===== */
.grid {
  display: grid;
  gap: 30px;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

/* ===== 卡片 ===== */
.card {
  padding: 32px 28px;
  background: var(--glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: var(--border-glass);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition), border var(--transition);
  position: relative;
  overflow: hidden;
}

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

.card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-hover);
  background: var(--glass-hover);
  border-color: var(--border-glass-strong);
}

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

.card p {
  color: var(--text-muted);
  line-height: 1.7;
}

/* ===== SVG图标 ===== */
.svg-icon {
  width: 52px;
  height: 52px;
  fill: var(--primary);
  margin-bottom: 18px;
  transition: transform var(--transition), fill var(--transition);
}

.card:hover .svg-icon {
  transform: scale(1.1) translateY(-2px);
  fill: var(--primary-light);
}

/* ===== Banner ===== */
.banner {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius);
  min-height: 420px;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 60px 40px;
  background: var(--gradient-banner);
  border: var(--border-glass);
  box-shadow: var(--shadow);
}

.banner-slide {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity 0.8s cubic-bezier(0.4, 0, 0.2, 1);
  padding: 40px;
}

.banner-slide.active {
  opacity: 1;
}

.banner-content {
  position: relative;
  z-index: 2;
  max-width: 700px;
}

.banner-content p {
  font-size: 1.15rem;
  margin-bottom: 32px;
  color: rgba(255, 255, 255, 0.8);
  line-height: 1.6;
}

.banner::after {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at center, transparent 30%, rgba(0,0,0,0.3) 100%);
  pointer-events: none;
}

/* ===== 统计数据 ===== */
.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 24px;
  text-align: center;
}

.stat-grid > div {
  padding: 28px 16px;
  background: var(--glass);
  backdrop-filter: blur(8px);
  border: var(--border-glass);
  border-radius: var(--radius-sm);
  transition: transform var(--transition), background var(--transition);
}

.stat-grid > div:hover {
  transform: translateY(-4px);
  background: var(--glass-hover);
}

.stat-number {
  font-size: clamp(2rem, 4vw, 2.8rem);
  font-weight: 800;
  color: var(--primary);
  line-height: 1.2;
  margin-bottom: 6px;
}

.stat-grid p {
  font-size: 0.95rem;
  color: var(--text-muted);
  letter-spacing: 0.5px;
}

/* ===== FAQ ===== */
.faq-item {
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  padding: 22px 0;
  cursor: pointer;
  transition: background var(--transition);
  border-radius: 4px;
}

.faq-item:hover {
  background: rgba(255, 255, 255, 0.02);
}

.faq-question {
  font-weight: 600;
  font-size: 1.05rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  user-select: none;
}

.faq-question span {
  font-size: 1.4rem;
  font-weight: 300;
  color: var(--primary);
  transition: transform 0.3s ease;
  flex-shrink: 0;
}

.faq-item.active .faq-question span {
  transform: rotate(45deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.45s cubic-bezier(0.4, 0, 0.2, 1), padding 0.3s ease;
  padding-top: 0;
  color: var(--text-muted);
  line-height: 1.7;
}

.faq-item.active .faq-answer {
  max-height: 400px;
  padding-top: 14px;
}

/* ===== HowTo步骤 ===== */
.howto-step {
  margin-bottom: 28px;
  padding: 24px 28px;
  background: var(--glass);
  backdrop-filter: blur(8px);
  border: var(--border-glass);
  border-radius: var(--radius-sm);
  transition: transform var(--transition), background var(--transition);
}

.howto-step:hover {
  transform: translateX(6px);
  background: var(--glass-hover);
}

.howto-step h3 {
  color: var(--primary);
  margin-bottom: 10px;
  font-size: 1.15rem;
}

.howto-step p {
  color: var(--text-muted);
  line-height: 1.7;
}

/* ===== 导航 ===== */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: var(--nav-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: var(--border-glass);
  transition: background var(--transition), border var(--transition);
}

.nav-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 20px;
  max-width: 1200px;
  margin: 0 auto;
  gap: 16px;
}

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

.nav-links a {
  color: var(--text);
  font-weight: 500;
  font-size: 0.95rem;
  transition: color var(--transition), opacity var(--transition);
  position: relative;
  padding: 4px 0;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--gradient-accent);
  transition: width 0.3s ease;
  border-radius: 2px;
}

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

.nav-links a:hover::after {
  width: 100%;
}

.menu-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text);
  font-size: 1.6rem;
  cursor: pointer;
  padding: 4px 8px;
  transition: color var(--transition);
  line-height: 1;
}

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

/* ===== 暗黑模式切换 ===== */
.dark-mode-toggle {
  background: none;
  border: var(--border-glass);
  color: var(--text);
  padding: 8px 18px;
  border-radius: 20px;
  cursor: pointer;
  transition: background var(--transition), color var(--transition), border var(--transition);
  font-size: 0.9rem;
  white-space: nowrap;
  flex-shrink: 0;
}

.dark-mode-toggle:hover {
  background: var(--glass-hover);
  border-color: var(--border-glass-strong);
}

/* ===== 搜索框 ===== */
.search-box {
  display: flex;
  gap: 12px;
  max-width: 480px;
  margin: 24px auto 0;
}

.search-box input {
  flex: 1;
  padding: 14px 24px;
  border-radius: 30px;
  border: var(--border-glass);
  background: var(--glass);
  color: var(--text);
  outline: none;
  font-size: 0.95rem;
  transition: border var(--transition), background var(--transition), box-shadow var(--transition);
}

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

.search-box input:focus {
  border-color: var(--primary);
  background: var(--glass-hover);
  box-shadow: 0 0 0 3px rgba(233, 69, 96, 0.15);
}

.search-box button {
  padding: 14px 28px;
  border-radius: 30px;
  background: var(--gradient-accent);
  color: #fff;
  border: none;
  cursor: pointer;
  font-weight: 600;
  transition: transform var(--transition), box-shadow var(--transition);
  white-space: nowrap;
}

.search-box button:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(233, 69, 96, 0.35);
}

/* ===== 文章卡片 ===== */
.article-card .read-more {
  display: inline-block;
  margin-top: 16px;
  color: var(--primary);
  font-weight: 600;
  font-size: 0.95rem;
  transition: gap var(--transition);
  position: relative;
}

.article-card .read-more::after {
  content: ' →';
  transition: margin-left 0.3s ease;
}

.article-card .read-more:hover::after {
  margin-left: 6px;
}

/* ===== 返回顶部 ===== */
.scroll-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: var(--gradient-accent);
  color: #fff;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow);
  transition: transform var(--transition), box-shadow var(--transition), opacity var(--transition);
  z-index: 999;
  font-size: 1.4rem;
  opacity: 0;
  pointer-events: none;
}

.scroll-top.visible {
  opacity: 1;
  pointer-events: auto;
}

.scroll-top:hover {
  transform: scale(1.12);
  box-shadow: var(--shadow-hover);
}

.scroll-top:active {
  transform: scale(0.95);
}

/* ===== 页脚 ===== */
footer {
  background: var(--footer-bg);
  padding: 60px 20px 30px;
  margin-top: 60px;
  border-top: var(--border-glass);
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 40px;
  max-width: 1200px;
  margin: 0 auto;
}

.footer-grid h3 {
  font-size: 1.1rem;
  margin-bottom: 16px;
  color: var(--text);
}

.footer-grid p,
.footer-grid li {
  color: var(--text-muted);
  line-height: 1.8;
  font-size: 0.95rem;
}

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

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

.footer-bottom {
  text-align: center;
  padding-top: 32px;
  border-top: var(--border-glass);
  margin-top: 32px;
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 2;
}

.footer-bottom p {
  margin: 4px 0;
}

/* ===== 滚动动画 ===== */
.animate-on-scroll {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.7s cubic-bezier(0.4, 0, 0.2, 1), transform 0.7s cubic-bezier(0.4, 0, 0.2, 1);
}

.animate-on-scroll.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
  .section {
    padding: 80px 0;
  }
  
  .banner {
    min-height: 360px;
    padding: 40px 24px;
  }
}

@media (max-width: 768px) {
  h1 {
    font-size: clamp(1.6rem, 6vw, 2rem);
  }
  
  h2 {
    font-size: clamp(1.3rem, 4.5vw, 1.6rem);
    margin-bottom: 30px;
  }
  
  .section {
    padding: 60px 0;
  }
  
  .banner {
    min-height: 280px;
    padding: 30px 20px;
    border-radius: var(--radius-sm);
  }
  
  .banner-content p {
    font-size: 1rem;
    margin-bottom: 24px;
  }
  
  .banner-slide {
    padding: 20px;
  }
  
  .nav-inner {
    padding: 12px 16px;
  }
  
  .nav-links {
    display: none;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--nav-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    padding: 16px 20px 20px;
    gap: 8px;
    border-bottom: var(--border-glass);
    box-shadow: var(--shadow);
  }
  
  .nav-links.open {
    display: flex;
  }
  
  .nav-links a {
    padding: 10px 0;
    font-size: 1rem;
  }
  
  .menu-toggle {
    display: block;
  }
  
  .card {
    padding: 24px 20px;
  }
  
  .grid {
    gap: 20px;
    grid-template-columns: 1fr;
  }
  
  .stat-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
  }
  
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 30px;
  }
  
  .search-box {
    flex-direction: column;
    max-width: 100%;
  }
  
  .search-box button {
    width: 100%;
  }
  
  .scroll-top {
    bottom: 20px;
    right: 20px;
    width: 44px;
    height: 44px;
    font-size: 1.2rem;
  }
  
  .howto-step {
    padding: 20px;
  }
  
  .faq-item {
    padding: 18px 0;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 16px;
  }
  
  .banner {
    min-height: 240px;
    padding: 24px 16px;
  }
  
  .btn {
    padding: 12px 24px;
    font-size: 0.9rem;
  }
  
  .stat-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
  }
  
  .stat-grid > div {
    padding: 20px 12px;
  }
  
  .stat-number {
    font-size: 1.6rem;
  }
  
  .nav-inner {
    padding: 10px 12px;
  }
  
  .dark-mode-toggle {
    padding: 6px 14px;
    font-size: 0.8rem;
  }
}

/* ===== 辅助类 ===== */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ===== 选中状态 ===== */
::selection {
  background: var(--primary);
  color: #fff;
}

/* ===== 滚动条 ===== */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

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

::-webkit-scrollbar-thumb {
  background: var(--primary);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--primary-light);
}