:root {
  --primary: #e94560;
  --primary-dark: #c73650;
  --primary-light: #ff6b81;
  --secondary: #0f3460;
  --secondary-light: #16213e;
  --accent: #533483;
  --bg-body: #f5f7fa;
  --bg-card: #ffffff;
  --bg-card-alt: #f9fbfd;
  --bg-nav: rgba(255, 255, 255, 0.82);
  --bg-hero-start: #1a1a2e;
  --bg-hero-end: #16213e;
  --bg-footer: #0f172a;
  --bg-footer-bottom: #020617;
  --text-primary: #1e1e2f;
  --text-secondary: #334155;
  --text-muted: #64748b;
  --text-light: #94a3b8;
  --border-color: #eaeef2;
  --border-card: #eef2f6;
  --border-table: #e2e8f0;
  --shadow-sm: 0 2px 12px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.04);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.06);
  --shadow-primary: 0 4px 16px rgba(233, 69, 96, 0.4);
  --radius-sm: 14px;
  --radius-md: 16px;
  --radius-lg: 20px;
  --radius-xl: 32px;
  --radius-full: 40px;
  --glass-bg: rgba(255, 255, 255, 0.72);
  --glass-border: rgba(255, 255, 255, 0.35);
  --glass-blur: 16px;
  --transition-fast: 0.15s ease;
  --transition-base: 0.25s ease;
  --transition-slow: 0.4s cubic-bezier(0.22, 0.61, 0.36, 1);
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg-body: #0f172a;
    --bg-card: #1e293b;
    --bg-card-alt: #1a2536;
    --bg-nav: rgba(30, 41, 59, 0.82);
    --bg-hero-start: #0b1120;
    --bg-hero-end: #111d33;
    --bg-footer: #020617;
    --bg-footer-bottom: #000000;
    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --text-muted: #94a3b8;
    --text-light: #64748b;
    --border-color: #334155;
    --border-card: #334155;
    --border-table: #334155;
    --shadow-sm: 0 2px 12px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.25);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.35);
    --glass-bg: rgba(30, 41, 59, 0.72);
    --glass-border: rgba(255, 255, 255, 0.08);
  }
}

*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

body {
  font-family: var(--font-sans);
  background: var(--bg-body);
  color: var(--text-primary);
  line-height: 1.7;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  transition: background var(--transition-base), color var(--transition-base);
}

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

::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

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

::-webkit-scrollbar-thumb {
  background: var(--text-light);
  border-radius: 10px;
  border: 2px solid var(--bg-body);
}

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

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

a {
  color: inherit;
  text-decoration: none;
}

ul {
  list-style: none;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
  width: 100%;
}

.sticky-nav {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--glass-bg);
  -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(180%);
  backdrop-filter: blur(var(--glass-blur)) saturate(180%);
  box-shadow: var(--shadow-sm);
  border-bottom: 1px solid var(--glass-border);
  transition: background var(--transition-base), box-shadow var(--transition-base);
}

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

.logo {
  font-weight: 700;
  font-size: 1.6rem;
  color: var(--text-primary);
  letter-spacing: 1px;
  transition: transform var(--transition-fast), color var(--transition-base);
  white-space: nowrap;
  user-select: none;
}

.logo span {
  color: var(--primary);
  transition: color var(--transition-base);
}

.logo:hover {
  transform: scale(1.04);
}

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

.nav-links {
  display: flex;
  gap: 28px;
  list-style: none;
  font-weight: 500;
  color: var(--text-secondary);
  flex-wrap: wrap;
}

.nav-links a {
  text-decoration: none;
  color: inherit;
  transition: color var(--transition-base), transform var(--transition-fast);
  position: relative;
  padding: 4px 0;
  white-space: nowrap;
}

.nav-links a::after {
  content: "";
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--primary);
  border-radius: 2px;
  transition: width var(--transition-base);
}

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

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

.search-box {
  display: flex;
  align-items: center;
  background: var(--bg-card-alt);
  border-radius: var(--radius-full);
  padding: 6px 16px;
  border: 1px solid var(--border-card);
  transition: border-color var(--transition-base), box-shadow var(--transition-base);
}

.search-box:focus-within {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(233, 69, 96, 0.12);
}

.search-box input {
  border: none;
  background: transparent;
  outline: none;
  padding: 6px 0;
  font-size: 0.95rem;
  width: 160px;
  color: var(--text-primary);
  font-family: inherit;
  transition: width var(--transition-base);
}

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

.search-box button {
  background: none;
  border: none;
  cursor: pointer;
  font-size: 1rem;
  color: var(--text-muted);
  transition: color var(--transition-base), transform var(--transition-fast);
  padding: 0 0 0 6px;
  line-height: 1;
}

.search-box button:hover {
  color: var(--primary);
  transform: scale(1.15);
}

.breadcrumb {
  padding: 16px 0 8px;
  font-size: 0.9rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 2px;
}

.breadcrumb a {
  color: #3b82f6;
  text-decoration: none;
  transition: color var(--transition-base);
}

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

.breadcrumb span {
  margin: 0 6px;
}

.hero {
  position: relative;
  background: linear-gradient(135deg, var(--bg-hero-start) 0%, var(--bg-hero-end) 100%);
  color: #fff;
  padding: 48px 0 56px;
  border-radius: 0 0 var(--radius-xl) var(--radius-xl);
  margin-bottom: 32px;
  overflow: hidden;
  isolation: isolate;
}

.hero::before {
  content: "";
  position: absolute;
  top: -50%;
  right: -10%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(233, 69, 96, 0.25) 0%, transparent 70%);
  border-radius: 50%;
  z-index: -1;
  animation: float 8s ease-in-out infinite;
}

.hero::after {
  content: "";
  position: absolute;
  bottom: -40%;
  left: -5%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(83, 52, 131, 0.3) 0%, transparent 70%);
  border-radius: 50%;
  z-index: -1;
  animation: float 10s ease-in-out infinite reverse;
}

@keyframes float {
  0%, 100% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(30px, -30px) scale(1.08); }
}

.hero h1 {
  font-size: 2.6rem;
  font-weight: 800;
  line-height: 1.3;
  margin-bottom: 16px;
  letter-spacing: -0.5px;
  animation: fadeInUp 0.8s ease both;
}

.hero h1 span {
  color: var(--primary);
  background: linear-gradient(90deg, var(--primary), var(--primary-light));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero p {
  font-size: 1.15rem;
  max-width: 800px;
  opacity: 0.9;
  margin-bottom: 24px;
  animation: fadeInUp 0.8s ease 0.15s both;
}

.hero-stats {
  display: flex;
  gap: 40px;
  flex-wrap: wrap;
  margin-top: 28px;
  animation: fadeInUp 0.8s ease 0.3s both;
}

.stat-item {
  display: flex;
  flex-direction: column;
  transition: transform var(--transition-base);
}

.stat-item:hover {
  transform: translateY(-4px);
}

.stat-number {
  font-size: 2rem;
  font-weight: 700;
  color: var(--primary);
  line-height: 1.2;
  font-variant-numeric: tabular-nums;
}

.stat-label {
  font-size: 0.9rem;
  opacity: 0.7;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: 28px 32px;
  box-shadow: var(--shadow-md);
  margin-bottom: 28px;
  border: 1px solid var(--border-card);
  transition: box-shadow var(--transition-base), transform var(--transition-base), background var(--transition-base), border-color var(--transition-base);
  animation: fadeInUp 0.6s ease both;
}

.card:hover {
  box-shadow: var(--shadow-lg);
}

.section-title {
  font-size: 1.8rem;
  font-weight: 700;
  margin-bottom: 24px;
  color: var(--text-primary);
  border-left: 6px solid var(--primary);
  padding-left: 18px;
  line-height: 1.3;
  transition: color var(--transition-base);
}

.section-sub {
  font-size: 1.3rem;
  font-weight: 600;
  margin: 28px 0 12px;
  color: var(--text-primary);
  transition: color var(--transition-base);
}

.section-sub-sub {
  font-size: 1.1rem;
  font-weight: 600;
  margin: 20px 0 8px;
  color: var(--text-secondary);
  transition: color var(--transition-base);
}

p {
  margin-bottom: 16px;
  color: var(--text-secondary);
  transition: color var(--transition-base);
}

.card p a,
.card li a,
.card h3 a {
  color: #3b82f6;
  text-decoration: none;
  transition: color var(--transition-base);
}

.card p a:hover,
.card li a:hover,
.card h3 a:hover {
  color: var(--primary);
  text-decoration: underline;
}

.card ul {
  margin-left: 24px;
  margin-bottom: 16px;
  color: var(--text-secondary);
}

.card ul li {
  margin-bottom: 8px;
  position: relative;
  padding-left: 4px;
}

.card ul li::marker {
  color: var(--primary);
}

.article-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
  margin-top: 16px;
}

.article-card {
  background: var(--bg-card-alt);
  border-radius: var(--radius-md);
  padding: 20px;
  border: 1px solid var(--border-card);
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base), background var(--transition-base);
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
}

.article-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-slow);
}

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

.article-card:hover::before {
  transform: scaleX(1);
}

.article-card h4 {
  font-size: 1.1rem;
  margin-bottom: 8px;
  color: var(--text-primary);
  line-height: 1.4;
  transition: color var(--transition-base);
}

.article-card:hover h4 {
  color: var(--primary);
}

.article-meta {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.article-card p {
  font-size: 0.92rem;
  color: var(--text-secondary);
  margin-bottom: 12px;
  flex: 1;
}

.read-more {
  font-size: 0.9rem;
  color: var(--primary);
  font-weight: 500;
  text-decoration: none;
  transition: color var(--transition-base), transform var(--transition-fast);
  display: inline-block;
  align-self: flex-start;
}

.read-more:hover {
  color: var(--primary-light);
  transform: translateX(4px);
}

.faq-item {
  border-bottom: 1px solid var(--border-card);
  padding: 18px 0;
  transition: border-color var(--transition-base);
}

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

.faq-question {
  font-weight: 600;
  font-size: 1.05rem;
  color: var(--text-primary);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  transition: color var(--transition-base);
  user-select: none;
}

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

.faq-question span {
  flex-shrink: 0;
  font-size: 0.8rem;
  color: var(--primary);
  transition: transform var(--transition-base);
}

.faq-answer {
  margin-top: 12px;
  color: var(--text-secondary);
  font-size: 0.98rem;
  display: block;
  transition: color var(--transition-base);
}

.howto-step {
  background: var(--bg-card-alt);
  border-radius: var(--radius-sm);
  padding: 18px 22px;
  margin-bottom: 14px;
  border-left: 4px solid var(--primary);
  transition: transform var(--transition-base), box-shadow var(--transition-base), background var(--transition-base);
}

.howto-step:hover {
  transform: translateX(4px);
  box-shadow: var(--shadow-sm);
}

.howto-step strong {
  color: var(--text-primary);
  transition: color var(--transition-base);
}

.info-table {
  width: 100%;
  border-collapse: collapse;
  margin: 20px 0;
  font-size: 0.95rem;
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.info-table th,
.info-table td {
  border: 1px solid var(--border-table);
  padding: 12px 16px;
  text-align: left;
  transition: background var(--transition-base), border-color var(--transition-base), color var(--transition-base);
}

.info-table th {
  background: var(--bg-card-alt);
  font-weight: 600;
  color: var(--text-primary);
}

.info-table td {
  color: var(--text-secondary);
}

.info-table tr {
  transition: background var(--transition-base);
}

.info-table tbody tr:hover,
.info-table tr:hover {
  background: rgba(233, 69, 96, 0.04);
}

.footer {
  background: var(--bg-footer);
  color: #cbd5e1;
  padding: 48px 0 24px;
  margin-top: 48px;
  border-radius: var(--radius-xl) var(--radius-xl) 0 0;
  transition: background var(--transition-base);
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 32px;
}

.footer h4 {
  color: #fff;
  margin-bottom: 16px;
  font-size: 1.05rem;
}

.footer a {
  color: var(--text-light);
  text-decoration: none;
  display: block;
  margin-bottom: 8px;
  font-size: 0.92rem;
  transition: color var(--transition-base), transform var(--transition-fast);
}

.footer a:hover {
  color: var(--primary);
  transform: translateX(4px);
}

.footer p {
  color: var(--text-light);
  font-size: 0.9rem;
}

.footer-bottom {
  border-top: 1px solid #1e293b;
  margin-top: 36px;
  padding-top: 24px;
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #fff;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  box-shadow: var(--shadow-primary);
  cursor: pointer;
  text-decoration: none;
  z-index: 999;
  opacity: 0.9;
  transition: opacity var(--transition-base), transform var(--transition-base), box-shadow var(--transition-base);
  border: 1px solid rgba(255, 255, 255, 0.15);
}

.back-to-top:hover {
  opacity: 1;
  transform: translateY(-4px) scale(1.05);
  box-shadow: 0 8px 24px rgba(233, 69, 96, 0.55);
}

.back-to-top:active {
  transform: translateY(-2px) scale(0.98);
}

.count-up {
  display: inline-block;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.6; }
}

@media (max-width: 992px) {
  .hero h1 {
    font-size: 2.2rem;
  }
  .nav-links {
    gap: 18px;
    font-size: 0.92rem;
  }
  .search-box input {
    width: 130px;
  }
  .article-grid {
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  }
}

@media (max-width: 768px) {
  .hero {
    padding: 36px 0 44px;
    border-radius: 0 0 24px 24px;
  }
  .hero h1 {
    font-size: 1.9rem;
  }
  .hero p {
    font-size: 1rem;
  }
  .hero-stats {
    gap: 24px;
  }
  .stat-number {
    font-size: 1.6rem;
  }
  .nav-links {
    display: none;
  }
  .nav-inner {
    justify-content: space-between;
  }
  .card {
    padding: 20px;
    border-radius: var(--radius-md);
  }
  .section-title {
    font-size: 1.4rem;
    padding-left: 14px;
    border-left-width: 5px;
  }
  .section-sub {
    font-size: 1.15rem;
  }
  .search-box input {
    width: 100px;
  }
  .article-grid {
    grid-template-columns: 1fr;
  }
  .footer {
    border-radius: 24px 24px 0 0;
    padding: 36px 0 20px;
  }
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }
  .back-to-top {
    bottom: 20px;
    right: 20px;
    width: 42px;
    height: 42px;
    font-size: 1.2rem;
  }
  .info-table {
    font-size: 0.85rem;
  }
  .info-table th,
  .info-table td {
    padding: 10px 12px;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 14px;
  }
  .hero h1 {
    font-size: 1.6rem;
  }
  .hero-stats {
    gap: 18px;
  }
  .stat-number {
    font-size: 1.4rem;
  }
  .stat-label {
    font-size: 0.8rem;
  }
  .logo {
    font-size: 1.35rem;
  }
  .search-box {
    padding: 4px 12px;
  }
  .search-box input {
    width: 80px;
    font-size: 0.85rem;
  }
  .section-title {
    font-size: 1.25rem;
  }
  .faq-question {
    font-size: 0.98rem;
  }
  .howto-step {
    padding: 14px 16px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

@media print {
  .sticky-nav,
  .back-to-top,
  .search-box {
    display: none !important;
  }
  body {
    background: #fff;
    color: #000;
  }
  .card {
    box-shadow: none;
    border: 1px solid #ccc;
  }
}