/* ===== 全局重置 & 变量 ===== */
:root {
  --bg: #f8f9fa;
  --text: #222;
  --card-bg: #fff;
  --shadow: 0 8px 30px rgba(0,0,0,.06);
  --border: rgba(255,255,255,.1);
  --glass-bg: rgba(255,255,255,.05);
  --accent: #f5c518;
  --accent-hover: #e0b010;
  --dark-bg: #121212;
  --dark-text: #e0e0e0;
  --dark-card: #1e1e1e;
  --dark-shadow: 0 8px 30px rgba(0,0,0,.3);
  --dark-glass: rgba(255,255,255,.03);
  --header-gradient: linear-gradient(135deg,#1a1a2e,#16213e);
  --hero-gradient: linear-gradient(135deg,#0f3460,#1a1a2e,#16213e);
  --section-alt: #f1f3f5;
  --dark-section-alt: #1e1e1e;
  --breadcrumb-bg: #f1f3f5;
  --dark-breadcrumb-bg: #1e1e1e;
  --faq-border: #e9ecef;
  --dark-faq-border: #333;
  --faq-answer-color: #555;
  --dark-faq-answer-color: #bbb;
  --stat-text: #666;
  --dark-stat-text: #aaa;
  --article-p-color: #666;
  --dark-article-p-color: #aaa;
  --footer-bg: #1a1a2e;
  --footer-text: #ccc;
  --footer-border: #333;
  --tag-bg: rgba(245,197,24,.15);
  --tag-color: #f5c518;
  --placeholder-dark: #999;
  --carousel-bg: #1a1a2e;
  --carousel-control-bg: rgba(0,0,0,.5);
  --carousel-dot-bg: rgba(255,255,255,.4);
  --search-border: #ddd;
  --search-focus: #f5c518;
  --backtop-bg: #f5c518;
  --backtop-color: #1a1a2e;
  --dark-toggle-bg: #1a1a2e;
  --dark-toggle-color: #f5c518;
  --dark-toggle-active-bg: #f5c518;
  --dark-toggle-active-color: #1a1a2e;
  --nav-hover: rgba(245,197,24,.2);
  --btn-primary-text: #1a1a2e;
  --btn-outline-hover-text: #1a1a2e;
  --breadcrumb-link: #f5c518;
  --breadcrumb-span: #999;
  --logo-color: #f5c518;
  --hero-h1-shadow: rgba(0,0,0,.3);
  --card-hover-shadow: 0 16px 50px rgba(0,0,0,.12);
  --dark-card-hover-shadow: 0 16px 50px rgba(0,0,0,.4);
  --howto-step-border: #f5c518;
  --howto-step-shadow: 0 4px 15px rgba(0,0,0,.05);
  --dark-howto-step-shadow: 0 4px 15px rgba(0,0,0,.2);
  --article-item-shadow: 0 4px 15px rgba(0,0,0,.06);
  --dark-article-item-shadow: 0 4px 15px rgba(0,0,0,.2);
  --related-link-border: #eee;
  --dark-related-link-border: #333;
  --footer-link: #f5c518;
  --footer-qr-bg: rgba(255,255,255,.1);
  --footer-qr-color: #999;
  --menu-toggle-border: #f5c518;
  --menu-toggle-color: #f5c518;
  --scrollbar-thumb: #f5c518;
  --scrollbar-track: #f1f3f5;
  --dark-scrollbar-track: #1e1e1e;
}

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

body {
  font-family: 'Segoe UI', Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  transition: background .3s, color .3s;
  scroll-behavior: smooth;
}

body.dark {
  background: var(--dark-bg);
  color: var(--dark-text);
}

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

/* ===== 滚动条 ===== */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: var(--scrollbar-track); }
body.dark ::-webkit-scrollbar-track { background: var(--dark-scrollbar-track); }
::-webkit-scrollbar-thumb { background: var(--scrollbar-thumb); border-radius: 4px; }

/* ===== 头部 ===== */
header {
  background: var(--header-gradient);
  color: #fff;
  padding: 15px 0;
  position: sticky;
  top: 0;
  z-index: 1000;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  box-shadow: 0 2px 20px rgba(0,0,0,.2);
}

header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 24px;
  font-weight: 700;
  color: var(--logo-color);
}

.logo svg { width: 40px; height: 40px; }

nav ul {
  display: flex;
  list-style: none;
  gap: 20px;
}

nav a {
  color: #fff;
  text-decoration: none;
  font-size: 15px;
  padding: 8px 12px;
  border-radius: 8px;
  transition: background .3s;
}

nav a:hover { background: var(--nav-hover); }

.menu-toggle {
  display: none;
  background: none;
  border: 2px solid var(--menu-toggle-border);
  color: var(--menu-toggle-color);
  font-size: 28px;
  padding: 5px 12px;
  border-radius: 8px;
  cursor: pointer;
}

/* ===== 英雄区 ===== */
.hero {
  background: var(--hero-gradient);
  padding: 80px 0;
  text-align: center;
  color: #fff;
  position: relative;
  overflow: hidden;
}

.hero::after {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(245,197,24,.03) 0%, transparent 70%);
  animation: heroGlow 8s infinite alternate;
}

@keyframes heroGlow {
  0% { transform: translate(0, 0); }
  100% { transform: translate(30%, 30%); }
}

.hero h1 {
  font-size: 48px;
  margin-bottom: 20px;
  font-weight: 800;
  position: relative;
  z-index: 1;
  text-shadow: 0 2px 10px var(--hero-h1-shadow);
}

.hero h1 span { color: var(--accent); }

.hero p {
  font-size: 18px;
  max-width: 700px;
  margin: 0 auto 30px;
  opacity: .9;
  position: relative;
  z-index: 1;
}

.hero-buttons {
  display: flex;
  gap: 20px;
  justify-content: center;
  flex-wrap: wrap;
  position: relative;
  z-index: 1;
}

.btn {
  display: inline-block;
  padding: 14px 36px;
  border-radius: 50px;
  font-weight: 600;
  font-size: 16px;
  text-decoration: none;
  transition: all .3s;
  border: 2px solid transparent;
}

.btn-primary {
  background: var(--accent);
  color: var(--btn-primary-text);
  border-color: var(--accent);
}

.btn-primary:hover {
  background: transparent;
  color: var(--accent);
  transform: translateY(-3px);
  box-shadow: 0 10px 30px rgba(245,197,24,.3);
}

.btn-outline {
  border-color: #fff;
  color: #fff;
  background: transparent;
}

.btn-outline:hover {
  background: #fff;
  color: var(--btn-outline-hover-text);
  transform: translateY(-3px);
}

.hero-banner-img {
  width: 100%;
  max-width: 800px;
  height: auto;
  margin: 0 auto;
  display: block;
  border-radius: 20px;
}

/* ===== 面包屑 ===== */
.breadcrumb {
  background: var(--breadcrumb-bg);
  padding: 12px 0;
  font-size: 14px;
}

body.dark .breadcrumb { background: var(--dark-breadcrumb-bg); }

.breadcrumb a {
  color: var(--breadcrumb-link);
  text-decoration: none;
}

.breadcrumb a:hover { text-decoration: underline; }

.breadcrumb span { color: var(--breadcrumb-span); }

/* ===== 通用区块 ===== */
.section { padding: 70px 0; }

.section-title { text-align: center; margin-bottom: 50px; }

.section-title h2 {
  font-size: 34px;
  font-weight: 700;
  margin-bottom: 12px;
  position: relative;
  display: inline-block;
}

.section-title h2::after {
  content: '';
  display: block;
  width: 60px;
  height: 4px;
  background: var(--accent);
  margin: 10px auto 0;
  border-radius: 2px;
}

.section-title p {
  color: var(--stat-text);
  font-size: 16px;
  max-width: 600px;
  margin: 0 auto;
}

body.dark .section-title p { color: var(--dark-stat-text); }

/* ===== 卡片 ===== */
.card {
  background: var(--card-bg);
  border-radius: 20px;
  padding: 30px;
  box-shadow: var(--shadow);
  transition: all .4s;
  backdrop-filter: blur(5px);
  -webkit-backdrop-filter: blur(5px);
  border: 1px solid var(--border);
}

body.dark .card {
  background: var(--dark-card);
  box-shadow: var(--dark-shadow);
}

.card:hover {
  transform: translateY(-8px);
  box-shadow: var(--card-hover-shadow);
}

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

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

.flex-center {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 30px;
}

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

.mt-20 { margin-top: 20px; }

.mb-20 { margin-bottom: 20px; }

/* ===== 毛玻璃 ===== */
.glass {
  background: var(--glass-bg);
  backdrop-filter: blur(15px);
  -webkit-backdrop-filter: blur(15px);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 30px;
}

body.dark .glass { background: var(--dark-glass); }

/* ===== FAQ ===== */
.faq-item {
  border-bottom: 1px solid var(--faq-border);
  padding: 18px 0;
  cursor: pointer;
}

body.dark .faq-item { border-color: var(--dark-faq-border); }

.faq-question {
  font-weight: 600;
  font-size: 17px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.faq-answer {
  padding-top: 12px;
  color: var(--faq-answer-color);
  display: none;
  line-height: 1.8;
}

body.dark .faq-answer { color: var(--dark-faq-answer-color); }

.faq-item.active .faq-answer { display: block; }

.faq-toggle {
  font-size: 22px;
  transition: transform .3s;
  color: var(--accent);
}

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

/* ===== HowTo ===== */
.howto-step {
  background: var(--card-bg);
  border-radius: 16px;
  padding: 25px;
  margin-bottom: 20px;
  box-shadow: var(--howto-step-shadow);
  border-left: 5px solid var(--howto-step-border);
}

body.dark .howto-step {
  background: var(--dark-card);
  box-shadow: var(--dark-howto-step-shadow);
}

.howto-step h4 { font-size: 18px; margin-bottom: 8px; }

/* ===== 文章卡片 ===== */
.article-card img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  border-radius: 16px;
  margin-bottom: 15px;
}

.article-card .btn { font-size: 14px; padding: 8px 20px; }

/* ===== 文章网格 ===== */
.article-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 30px;
  margin-top: 30px;
}

.article-item {
  background: var(--card-bg);
  border-radius: 20px;
  overflow: hidden;
  box-shadow: var(--article-item-shadow);
  transition: all .3s;
}

body.dark .article-item {
  background: var(--dark-card);
  box-shadow: var(--dark-article-item-shadow);
}

.article-item:hover { transform: translateY(-5px); }

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

.article-item .content { padding: 20px; }

.article-item .content h3 { font-size: 18px; margin-bottom: 8px; }

.article-item .content p {
  font-size: 14px;
  color: var(--article-p-color);
  margin-bottom: 12px;
}

body.dark .article-item .content p { color: var(--dark-article-p-color); }

.article-item .content .date { font-size: 12px; color: var(--placeholder-dark); }

.article-item .content .btn { font-size: 13px; padding: 6px 16px; }

/* ===== 相关文章 ===== */
.related-posts {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 20px;
  margin-top: 20px;
}

.related-posts a {
  color: var(--accent);
  text-decoration: none;
  font-size: 15px;
  padding: 8px 0;
  border-bottom: 1px solid var(--related-link-border);
}

body.dark .related-posts a { border-color: var(--dark-related-link-border); }

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

/* ===== 页脚 ===== */
.footer {
  background: var(--footer-bg);
  color: var(--footer-text);
  padding: 50px 0 20px;
  margin-top: 60px;
}

.footer a {
  color: var(--footer-link);
  text-decoration: none;
}

.footer a:hover { text-decoration: underline; }

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

.footer-bottom {
  border-top: 1px solid var(--footer-border);
  padding-top: 25px;
  margin-top: 40px;
  text-align: center;
  font-size: 14px;
}

.footer .qr-code {
  width: 100px;
  height: 100px;
  background: var(--footer-qr-bg);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 10px auto;
  font-size: 12px;
  color: var(--footer-qr-color);
}

/* ===== 返回顶部 ===== */
.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  background: var(--backtop-bg);
  color: var(--backtop-color);
  width: 50px;
  height: 50px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  cursor: pointer;
  box-shadow: 0 4px 15px rgba(245,197,24,.4);
  border: none;
  z-index: 999;
  transition: all .3s;
  opacity: 0;
  visibility: hidden;
}

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

.back-to-top:hover { transform: scale(1.1); }

/* ===== 暗黑模式切换 ===== */
.dark-toggle {
  position: fixed;
  bottom: 90px;
  right: 30px;
  background: var(--dark-toggle-bg);
  color: var(--dark-toggle-color);
  width: 50px;
  height: 50px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  cursor: pointer;
  border: 2px solid var(--accent);
  z-index: 999;
  transition: all .3s;
}

body.dark .dark-toggle {
  background: var(--dark-toggle-active-bg);
  color: var(--dark-toggle-active-color);
}

/* ===== 搜索框 ===== */
.search-box {
  display: flex;
  gap: 8px;
  max-width: 400px;
  margin: 20px auto;
}

.search-box input {
  flex: 1;
  padding: 12px 18px;
  border-radius: 50px;
  border: 2px solid var(--search-border);
  font-size: 15px;
  outline: none;
  transition: border .3s;
}

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

.search-box button {
  background: var(--accent);
  color: var(--btn-primary-text);
  border: none;
  padding: 12px 24px;
  border-radius: 50px;
  font-weight: 600;
  cursor: pointer;
  transition: all .3s;
}

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

/* ===== 轮播 ===== */
.carousel {
  position: relative;
  overflow: hidden;
  border-radius: 20px;
  background: var(--carousel-bg);
  height: 400px;
}

.carousel-inner {
  display: flex;
  transition: transform .6s ease;
  height: 100%;
}

.carousel-item {
  min-width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 28px;
  font-weight: 700;
  padding: 40px;
  text-align: center;
}

.carousel-control {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  background: var(--carousel-control-bg);
  color: #fff;
  border: none;
  padding: 12px 18px;
  font-size: 24px;
  cursor: pointer;
  border-radius: 50%;
  z-index: 10;
  transition: background .3s;
}

.carousel-control:hover {
  background: var(--accent);
  color: var(--btn-primary-text);
}

.carousel-control.prev { left: 15px; }
.carousel-control.next { right: 15px; }

.carousel-dots {
  position: absolute;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 10px;
}

.carousel-dots span {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--carousel-dot-bg);
  cursor: pointer;
  transition: all .3s;
}

.carousel-dots span.active {
  background: var(--accent);
  transform: scale(1.3);
}

/* ===== 滚动动画 ===== */
.animate-on-scroll {
  opacity: 0;
  transform: translateY(30px);
  transition: all .6s ease;
}

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

/* ===== 数字统计 ===== */
.count-up {
  font-size: 42px;
  font-weight: 800;
  color: var(--accent);
  display: inline-block;
}

.stat-item { text-align: center; padding: 20px; }

.stat-item p {
  font-size: 16px;
  color: var(--stat-text);
  margin-top: 8px;
}

body.dark .stat-item p { color: var(--dark-stat-text); }

/* ===== 标签 ===== */
.tag {
  display: inline-block;
  background: var(--tag-bg);
  color: var(--tag-color);
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 13px;
  margin: 4px;
}

/* ===== 合作链接 ===== */
.partner-links {
  display: flex;
  flex-wrap: wrap;
  gap: 15px;
  justify-content: center;
}

.partner-links a {
  color: var(--accent);
  font-size: 14px;
}

/* ===== 响应式 ===== */
@media (max-width: 768px) {
  .hero h1 { font-size: 30px; }
  .hero p { font-size: 16px; }
  .menu-toggle { display: block; }
  nav ul {
    display: none;
    flex-direction: column;
    width: 100%;
    background: var(--footer-bg);
    padding: 20px;
    border-radius: 16px;
    margin-top: 15px;
  }
  nav ul.open { display: flex; }
  .carousel { height: 280px; }
  .carousel-item { font-size: 20px; }
  .section { padding: 50px 0; }
  .section-title h2 { font-size: 26px; }
}

@media (max-width: 480px) {
  .hero h1 { font-size: 24px; }
  .btn { padding: 12px 24px; font-size: 14px; }
  .container { padding: 0 12px; }
}

/* ===== 额外辅助 ===== */
.footer ul { list-style: none; }
.footer ul li { margin-bottom: 8px; }
.footer h4 { margin-bottom: 15px; }

/* ===== 内联SVG占位 ===== */
.hero-banner-img,
.card svg,
.article-item svg,
.footer svg {
  display: block;
  max-width: 100%;
  border-radius: inherit;
}