:root {
  --bg: #f8f9fc;
  --surface: #ffffff;
  --surface-glass: rgba(255, 255, 255, 0.72);
  --text: #1e1e2f;
  --text-secondary: #4a4a5a;
  --accent: #d94f1e;
  --accent-2: #f0a030;
  --accent-light: #fce9e1;
  --border: #e2e4e9;
  --card-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
  --card-shadow-hover: 0 14px 36px rgba(217, 79, 30, 0.16);
  --header-bg: rgba(255, 255, 255, 0.72);
  --footer-bg: #1e1e2f;
  --footer-text: #d0d0dd;
  --radius: 16px;
  --radius-sm: 12px;
  --transition: 0.25s ease;
  --gradient-brand: linear-gradient(135deg, #d94f1e 0%, #f0a030 55%, #f7c948 100%);
  --gradient-banner: linear-gradient(135deg, #fce9e1 0%, #ffffff 45%, #fff4e0 100%);
}

body.dark-mode {
  --bg: #12121c;
  --surface: #1e1e2f;
  --surface-glass: rgba(30, 30, 47, 0.72);
  --text: #eaeaf5;
  --text-secondary: #b0b0c0;
  --accent: #f06a3a;
  --accent-2: #f0a030;
  --accent-light: #2a1a14;
  --border: #2e2e42;
  --card-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
  --card-shadow-hover: 0 14px 36px rgba(0, 0, 0, 0.55);
  --header-bg: rgba(18, 18, 28, 0.72);
  --footer-bg: #0c0c14;
  --footer-text: #a0a0b8;
  --gradient-banner: linear-gradient(135deg, #2a1a14 0%, #1e1e2f 50%, #241a12 100%);
}

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

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

body {
  font-family: -apple-system, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
  background-color: var(--bg);
  color: var(--text);
  line-height: 1.7;
  transition: background-color var(--transition), color var(--transition);
  padding-top: 70px;
  overflow-x: hidden;
}

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

a:hover {
  color: #b83e12;
  text-decoration: underline;
}

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

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

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: var(--header-bg);
  backdrop-filter: blur(16px) saturate(180%);
  -webkit-backdrop-filter: blur(16px) saturate(180%);
  border-bottom: 1px solid var(--border);
  transition: background var(--transition), border var(--transition);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
  gap: 16px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.5px;
  text-decoration: none;
  flex-shrink: 0;
}

.logo:hover {
  text-decoration: none;
}

.logo svg {
  width: 36px;
  height: 36px;
  transition: transform var(--transition);
}

.logo:hover svg {
  transform: rotate(-8deg) scale(1.08);
}

.logo span {
  background: var(--gradient-brand);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-links {
  display: flex;
  gap: 28px;
  list-style: none;
  font-size: 0.95rem;
  font-weight: 500;
}

.nav-links a {
  color: var(--text-secondary);
  text-decoration: none;
  padding: 6px 0;
  border-bottom: 2px solid transparent;
  transition: color var(--transition), border-color var(--transition);
}

.nav-links a:hover {
  color: var(--accent);
  border-bottom-color: var(--accent);
  text-decoration: none;
}

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

.search-box {
  display: flex;
  align-items: center;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 40px;
  padding: 6px 16px;
  transition: border var(--transition), box-shadow var(--transition);
}

.search-box:focus-within {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-light);
}

.search-box input {
  border: none;
  background: transparent;
  outline: none;
  color: var(--text);
  font-size: 0.9rem;
  width: 140px;
}

.search-box input::placeholder {
  color: var(--text-secondary);
  opacity: 0.7;
}

.search-box button {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text-secondary);
  padding: 0 4px;
  display: flex;
  align-items: center;
  transition: color var(--transition);
}

.search-box button:hover {
  color: var(--accent);
}

.theme-toggle, .menu-toggle {
  background: none;
  border: 1px solid var(--border);
  border-radius: 50%;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--text);
  transition: background var(--transition), border var(--transition), transform var(--transition);
}

.theme-toggle:hover, .menu-toggle:hover {
  background: var(--accent-light);
  border-color: var(--accent);
  transform: translateY(-2px);
}

.menu-toggle {
  display: none;
}

.mobile-menu {
  display: none;
  position: fixed;
  top: 70px;
  left: 0;
  width: 100%;
  background: var(--surface-glass);
  backdrop-filter: blur(16px) saturate(180%);
  -webkit-backdrop-filter: blur(16px) saturate(180%);
  border-bottom: 1px solid var(--border);
  padding: 20px;
  z-index: 999;
  flex-direction: column;
  gap: 16px;
  box-shadow: var(--card-shadow);
}

.mobile-menu.open {
  display: flex;
  animation: slideDown 0.3s ease;
}

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

.mobile-menu a {
  color: var(--text);
  font-weight: 500;
  padding: 8px 0;
  border-bottom: 1px solid var(--border);
  text-decoration: none;
}

.mobile-menu a:hover {
  color: var(--accent);
  text-decoration: none;
}

.breadcrumb {
  padding: 20px 0 10px;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

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

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

.breadcrumb span {
  margin: 0 8px;
}

.banner {
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
  margin-bottom: 40px;
  background: var(--surface);
  box-shadow: var(--card-shadow);
  min-height: 280px;
}

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

.slide {
  min-width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 40px 48px;
  gap: 30px;
  background: var(--gradient-banner);
}

.slide-content {
  flex: 1;
}

.slide-content h2 {
  font-size: 2rem;
  margin-bottom: 12px;
  color: var(--text);
  line-height: 1.3;
  letter-spacing: -0.5px;
}

.slide-content p {
  color: var(--text-secondary);
  font-size: 1.05rem;
  margin-bottom: 20px;
}

.slide-content .btn {
  display: inline-block;
  background: var(--gradient-brand);
  color: #fff;
  padding: 10px 28px;
  border-radius: 40px;
  font-weight: 600;
  text-decoration: none;
  transition: transform var(--transition), box-shadow var(--transition);
  box-shadow: 0 6px 18px rgba(217, 79, 30, 0.28);
}

.slide-content .btn:hover {
  transform: translateY(-2px);
  text-decoration: none;
  color: #fff;
  box-shadow: 0 10px 26px rgba(217, 79, 30, 0.42);
}

.slide-svg {
  flex: 0 0 200px;
  display: flex;
  justify-content: center;
  align-items: center;
}

.slide-svg svg {
  width: 180px;
  height: 180px;
  transition: transform 0.5s ease;
}

.slide:hover .slide-svg svg {
  transform: scale(1.06) rotate(3deg);
}

.banner-dots {
  position: absolute;
  bottom: 16px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 10px;
}

.dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--border);
  cursor: pointer;
  transition: background var(--transition), transform var(--transition), width var(--transition);
}

.dot.active {
  background: var(--accent);
  width: 26px;
  border-radius: 6px;
}

.stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 20px;
  margin-bottom: 48px;
}

.stat-item {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 28px 20px;
  text-align: center;
  box-shadow: var(--card-shadow);
  border: 1px solid var(--border);
  transition: transform var(--transition), box-shadow var(--transition);
}

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

.stat-number {
  font-size: 2.4rem;
  font-weight: 800;
  background: var(--gradient-brand);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.2;
}

.stat-label {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-top: 6px;
}

.card {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 28px 30px;
  box-shadow: var(--card-shadow);
  border: 1px solid var(--border);
  margin-bottom: 28px;
  transition: transform var(--transition), box-shadow var(--transition);
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: var(--card-shadow-hover);
}

.card h2 {
  font-size: 1.6rem;
  margin-bottom: 16px;
  color: var(--text);
  border-left: 4px solid var(--accent);
  padding-left: 14px;
  line-height: 1.35;
}

.card h3 {
  font-size: 1.25rem;
  margin: 20px 0 10px;
  color: var(--text);
}

.card h4 {
  font-size: 1.05rem;
  margin: 16px 0 8px;
  color: var(--text-secondary);
}

.card p {
  color: var(--text-secondary);
  margin-bottom: 12px;
}

.card ul, .card ol {
  margin-left: 22px;
  color: var(--text-secondary);
  margin-bottom: 12px;
}

.card li {
  margin-bottom: 6px;
}

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

.article-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 24px;
  margin-top: 20px;
}

.article-card {
  background: var(--surface);
  border-radius: var(--radius-sm);
  padding: 22px;
  border: 1px solid var(--border);
  box-shadow: var(--card-shadow);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
  display: flex;
  flex-direction: column;
}

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

.article-card h3 {
  font-size: 1.1rem;
  margin-bottom: 8px;
  color: var(--text);
  line-height: 1.45;
}

.article-meta {
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-bottom: 10px;
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.article-card p {
  color: var(--text-secondary);
  font-size: 0.92rem;
  flex: 1;
  margin-bottom: 14px;
}

.article-card .read-more {
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--accent);
  align-self: flex-start;
  transition: transform var(--transition);
}

.article-card:hover .read-more {
  transform: translateX(4px);
}

.faq-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.faq-item {
  border-bottom: 1px solid var(--border);
  padding: 4px 0;
}

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

.faq-question {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  padding: 16px 0;
  cursor: pointer;
  font-weight: 600;
  color: var(--text);
  transition: color var(--transition);
}

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

.faq-question svg {
  width: 20px;
  height: 20px;
  transition: transform var(--transition);
  flex-shrink: 0;
  color: var(--accent);
}

.faq-item.open .faq-question svg {
  transform: rotate(180deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, padding 0.3s ease;
  color: var(--text-secondary);
  font-size: 0.95rem;
  padding: 0;
}

.faq-item.open .faq-answer {
  max-height: 600px;
  padding: 0 0 18px;
}

.howto-step {
  display: flex;
  gap: 16px;
  margin-bottom: 20px;
}

.step-number {
  flex-shrink: 0;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--gradient-brand);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1rem;
  box-shadow: 0 4px 12px rgba(217, 79, 30, 0.28);
}

.step-content h4 {
  margin-bottom: 6px;
  color: var(--text);
}

.step-content p {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.team-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 20px;
  margin-top: 16px;
}

.team-member {
  background: var(--bg);
  border-radius: var(--radius-sm);
  padding: 20px;
  text-align: center;
  border: 1px solid var(--border);
  transition: transform var(--transition), box-shadow var(--transition);
}

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

.team-member svg {
  width: 64px;
  height: 64px;
  margin: 0 auto 10px;
  border-radius: 50%;
  background: var(--accent-light);
  padding: 10px;
}

.team-member h4 {
  margin-bottom: 4px;
  color: var(--text);
}

.team-member p {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.site-footer {
  background: var(--footer-bg);
  color: var(--footer-text);
  padding: 48px 0 24px;
  margin-top: 60px;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 32px;
  margin-bottom: 36px;
}

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

.footer-col ul {
  list-style: none;
  padding: 0;
}

.footer-col li {
  margin-bottom: 8px;
}

.footer-col a {
  color: var(--footer-text);
  font-size: 0.9rem;
  text-decoration: none;
  transition: color var(--transition), padding-left var(--transition);
}

.footer-col a:hover {
  color: #fff;
  text-decoration: underline;
  padding-left: 4px;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 20px;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
  font-size: 0.85rem;
  color: var(--footer-text);
}

.footer-bottom a {
  color: var(--footer-text);
}

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

.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--gradient-brand);
  color: #fff;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition), visibility var(--transition), transform var(--transition);
  z-index: 900;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
}

.back-to-top:hover {
  transform: translateY(-4px);
}

.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

@media (max-width: 900px) {
  .nav-links {
    display: none;
  }
  .menu-toggle {
    display: flex;
  }
  .search-box {
    display: none;
  }
  .slide {
    flex-direction: column;
    padding: 30px 24px;
    text-align: center;
  }
  .slide-svg {
    flex: none;
  }
  .slide-svg svg {
    width: 120px;
    height: 120px;
  }
  .slide-content h2 {
    font-size: 1.5rem;
  }
  .slide-content .btn {
    margin: 0 auto;
  }
}

@media (max-width: 600px) {
  body {
    padding-top: 64px;
  }
  .header-inner {
    height: 64px;
  }
  .logo {
    font-size: 1.15rem;
  }
  .logo svg {
    width: 30px;
    height: 30px;
  }
  .banner {
    min-height: 200px;
  }
  .slide-content h2 {
    font-size: 1.3rem;
  }
  .slide-content p {
    font-size: 0.95rem;
  }
  .stat-number {
    font-size: 1.8rem;
  }
  .card {
    padding: 20px 18px;
  }
  .card h2 {
    font-size: 1.3rem;
  }
  .article-grid {
    grid-template-columns: 1fr;
  }
  .footer-bottom {
    flex-direction: column;
    gap: 10px;
    text-align: center;
  }
  .back-to-top {
    bottom: 20px;
    right: 20px;
    width: 42px;
    height: 42px;
  }
}

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

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

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

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

::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 8px;
}

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

:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 2px;
  border-radius: 4px;
}