/* ============================================================
   皇冠体育 - CROWNSPORTS 完整样式表
   风格：现代奢华 + 渐变Banner + 毛玻璃效果 + 暗色模式
   ============================================================ */

/* ---------- CSS 变量与全局重置 ---------- */
:root {
  --bg: #0b0b14;
  --text: #e8e8f0;
  --primary: #f0c040;
  --primary-light: #f5d86a;
  --secondary: #14141f;
  --card-bg: rgba(26, 26, 46, 0.55);
  --card-border: rgba(255, 255, 255, 0.06);
  --glass-bg: rgba(20, 20, 31, 0.65);
  --glass-border: rgba(255, 255, 255, 0.08);
  --shadow: 0 8px 32px rgba(0, 0, 0, 0.45);
  --shadow-hover: 0 12px 40px rgba(0, 0, 0, 0.6);
  --radius: 16px;
  --radius-sm: 10px;
  --transition: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --nav-height: 68px;
  --max-width: 1200px;
}

/* 亮色模式（通过 prefers-color-scheme 可自动切换，但保留手动 class） */
.light {
  --bg: #f5f2ed;
  --text: #1a1a24;
  --card-bg: rgba(255, 255, 255, 0.6);
  --card-border: rgba(0, 0, 0, 0.06);
  --glass-bg: rgba(255, 255, 255, 0.5);
  --glass-border: rgba(0, 0, 0, 0.05);
  --shadow: 0 8px 32px rgba(0, 0, 0, 0.08);
  --shadow-hover: 0 12px 40px rgba(0, 0, 0, 0.12);
  --secondary: #ffffff;
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  transition: background var(--transition), color var(--transition);
  overflow-x: hidden;
}

/* ---------- 滚动条 ---------- */
::-webkit-scrollbar {
  width: 6px;
}
::-webkit-scrollbar-track {
  background: var(--secondary);
}
::-webkit-scrollbar-thumb {
  background: var(--primary);
  border-radius: 8px;
}

/* ---------- 容器 ---------- */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- 链接 ---------- */
a {
  color: var(--primary);
  text-decoration: none;
  transition: color var(--transition);
}
a:hover {
  color: var(--primary-light);
}

/* ---------- 通用按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 36px;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: #0b0b14;
  font-weight: 700;
  font-size: 1rem;
  border-radius: 50px;
  border: none;
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition), filter var(--transition);
  box-shadow: 0 4px 20px rgba(240, 192, 64, 0.25);
  letter-spacing: 0.3px;
}
.btn:hover {
  transform: translateY(-3px) scale(1.02);
  box-shadow: 0 8px 32px rgba(240, 192, 64, 0.4);
  filter: brightness(1.05);
}
.btn:active {
  transform: scale(0.97);
}

/* ---------- HEADER / 导航 ---------- */
header {
  background: rgba(20, 20, 31, 0.82);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--glass-border);
  padding: 0 0;
  height: var(--nav-height);
  position: sticky;
  top: 0;
  z-index: 1000;
  transition: background var(--transition), backdrop-filter var(--transition);
}
.light header {
  background: rgba(255, 255, 255, 0.75);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

.header-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 100%;
}

.logo {
  font-size: 1.6rem;
  font-weight: 800;
  letter-spacing: 1.5px;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.logo span {
  color: #fff;
  -webkit-text-fill-color: #fff;
}
.light .logo span {
  color: #1a1a24;
  -webkit-text-fill-color: #1a1a24;
}

.nav-links {
  display: flex;
  gap: 28px;
  list-style: none;
  align-items: center;
}
.nav-links a {
  color: rgba(255, 255, 255, 0.75);
  font-size: 0.92rem;
  font-weight: 500;
  padding: 6px 0;
  position: relative;
  transition: color var(--transition);
}
.nav-links a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--primary);
  transition: width var(--transition);
}
.nav-links a:hover {
  color: var(--primary);
}
.nav-links a:hover::after {
  width: 100%;
}
.light .nav-links a {
  color: rgba(0, 0, 0, 0.65);
}
.light .nav-links a:hover {
  color: var(--primary);
}

.menu-toggle {
  display: none;
  background: none;
  border: none;
  color: #fff;
  font-size: 1.8rem;
  cursor: pointer;
  line-height: 1;
  padding: 4px;
}
.light .menu-toggle {
  color: #1a1a24;
}

.dark-toggle {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.15);
  color: #fff;
  padding: 6px 16px;
  border-radius: 30px;
  cursor: pointer;
  font-size: 0.85rem;
  font-weight: 500;
  transition: background var(--transition), border-color var(--transition);
  backdrop-filter: blur(4px);
}
.dark-toggle:hover {
  background: rgba(255, 255, 255, 0.18);
  border-color: var(--primary);
}
.light .dark-toggle {
  background: rgba(0, 0, 0, 0.04);
  border-color: rgba(0, 0, 0, 0.1);
  color: #1a1a24;
}
.light .dark-toggle:hover {
  background: rgba(0, 0, 0, 0.08);
  border-color: var(--primary);
}

/* ---------- HERO 渐变Banner ---------- */
.hero {
  position: relative;
  min-height: 85vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 120px 0 100px;
  background: linear-gradient(145deg, #0f0f1e 0%, #1a1a30 40%, #252545 70%, #0b0b14 100%);
  overflow: hidden;
}
.light .hero {
  background: linear-gradient(145deg, #f5f2ed 0%, #e8e0d5 40%, #ddd5c5 70%, #f5f2ed 100%);
}
.hero::before {
  content: '';
  position: absolute;
  top: -30%;
  left: -20%;
  width: 70%;
  height: 120%;
  background: radial-gradient(circle at 30% 40%, rgba(240, 192, 64, 0.08), transparent 60%);
  pointer-events: none;
}
.hero::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, transparent, var(--primary), var(--primary-light), var(--primary), transparent);
  opacity: 0.7;
}

.hero .container {
  position: relative;
  z-index: 2;
}

.hero h1 {
  font-size: 3.8rem;
  font-weight: 800;
  letter-spacing: -1px;
  margin-bottom: 20px;
  line-height: 1.15;
  background: linear-gradient(135deg, #fff 0%, var(--primary-light) 50%, var(--primary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: heroGlow 3s ease-in-out infinite alternate;
}
@keyframes heroGlow {
  0% { filter: drop-shadow(0 0 20px rgba(240, 192, 64, 0.2)); }
  100% { filter: drop-shadow(0 0 40px rgba(240, 192, 64, 0.4)); }
}
.light .hero h1 {
  background: linear-gradient(135deg, #1a1a24 0%, #b8860b 50%, #8b6508 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero p {
  font-size: 1.25rem;
  max-width: 680px;
  margin: 0 auto 40px;
  opacity: 0.85;
  color: rgba(255, 255, 255, 0.8);
  line-height: 1.7;
}
.light .hero p {
  color: rgba(0, 0, 0, 0.7);
}

.hero .btn {
  font-size: 1.1rem;
  padding: 16px 44px;
}

/* ---------- SECTION 通用 ---------- */
.section {
  padding: 100px 0;
  position: relative;
}

.section-title {
  font-size: 2.4rem;
  text-align: center;
  margin-bottom: 60px;
  font-weight: 700;
  letter-spacing: -0.3px;
  position: relative;
}
.section-title::after {
  content: '';
  display: block;
  width: 80px;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--primary-light));
  margin: 16px auto 0;
  border-radius: 4px;
}

/* ---------- 毛玻璃卡片 ---------- */
.glass-card {
  background: var(--card-bg);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition);
}
.glass-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-hover);
  background: rgba(26, 26, 46, 0.7);
}
.light .glass-card:hover {
  background: rgba(255, 255, 255, 0.75);
}

/* ---------- ABOUT 区域 ---------- */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.about-text p {
  margin-bottom: 20px;
  font-size: 1.05rem;
  opacity: 0.9;
  line-height: 1.8;
}

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

.stat-item {
  background: var(--card-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-sm);
  padding: 30px 20px;
  text-align: center;
  box-shadow: var(--shadow);
  transition: transform var(--transition), box-shadow var(--transition);
}
.stat-item:hover {
  transform: translateY(-8px) scale(1.02);
  box-shadow: var(--shadow-hover);
}

.stat-number {
  font-size: 2.6rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.2;
}

.stat-label {
  font-size: 0.9rem;
  margin-top: 6px;
  opacity: 0.7;
  font-weight: 500;
}

/* ---------- 服务卡片网格 ---------- */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 30px;
}

.card {
  background: var(--card-bg);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 36px 28px;
  box-shadow: var(--shadow);
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition);
  position: relative;
  overflow: hidden;
}
.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, var(--primary), var(--primary-light));
  opacity: 0;
  transition: opacity var(--transition);
}
.card:hover::before {
  opacity: 1;
}
.card:hover {
  transform: translateY(-10px);
  box-shadow: var(--shadow-hover);
  background: rgba(26, 26, 46, 0.7);
}
.light .card:hover {
  background: rgba(255, 255, 255, 0.8);
}

.card h3 {
  font-size: 1.3rem;
  margin-bottom: 14px;
  color: var(--primary);
  font-weight: 700;
}

.card p {
  font-size: 0.95rem;
  opacity: 0.8;
  line-height: 1.7;
}

/* ---------- 用户评价 ---------- */
.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
}

.testimonial {
  background: var(--glass-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  padding: 32px;
  border-left: 4px solid var(--primary);
  box-shadow: var(--shadow);
  transition: transform var(--transition), box-shadow var(--transition);
}
.testimonial:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}

.testimonial p {
  font-style: italic;
  margin-bottom: 16px;
  font-size: 1rem;
  opacity: 0.9;
}

.testimonial .author {
  font-weight: 600;
  color: var(--primary);
  font-size: 0.95rem;
}

/* ---------- FAQ ---------- */
.faq-list {
  max-width: 820px;
  margin: 0 auto;
}

.faq-item {
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  padding: 20px 0;
  cursor: pointer;
  transition: background var(--transition);
  border-radius: 8px;
  padding-left: 12px;
  padding-right: 12px;
}
.faq-item:hover {
  background: rgba(255, 255, 255, 0.02);
}
.light .faq-item {
  border-bottom: 1px solid rgba(0, 0, 0, 0.06);
}
.light .faq-item:hover {
  background: rgba(0, 0, 0, 0.02);
}

.faq-question {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-weight: 600;
  font-size: 1.05rem;
  gap: 16px;
}

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

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

.faq-answer {
  padding-top: 14px;
  display: none;
  font-size: 0.95rem;
  opacity: 0.8;
  line-height: 1.7;
}

.faq-item.active .faq-answer {
  display: block;
  animation: fadeSlide 0.3s ease;
}

@keyframes fadeSlide {
  from { opacity: 0; transform: translateY(-6px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ---------- 投注指南 ---------- */
.howto-steps {
  list-style: none;
  counter-reset: step;
  max-width: 780px;
  margin: 0 auto;
}

.howto-step {
  display: flex;
  gap: 24px;
  padding: 28px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  transition: background var(--transition);
  border-radius: 12px;
  padding-left: 12px;
  padding-right: 12px;
}
.howto-step:hover {
  background: rgba(255, 255, 255, 0.02);
}
.light .howto-step {
  border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}
.light .howto-step:hover {
  background: rgba(0, 0, 0, 0.01);
}

.howto-step::before {
  counter-increment: step;
  content: counter(step);
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: #0b0b14;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 1.1rem;
  flex-shrink: 0;
  box-shadow: 0 4px 12px rgba(240, 192, 64, 0.2);
}

.howto-step h4 {
  margin-bottom: 6px;
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--primary);
}

.howto-step p {
  font-size: 0.95rem;
  opacity: 0.8;
  line-height: 1.7;
}

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

.article-card {
  background: var(--card-bg);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow);
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition);
}
.article-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-hover);
  background: rgba(26, 26, 46, 0.7);
}
.light .article-card:hover {
  background: rgba(255, 255, 255, 0.8);
}

.article-card .date {
  font-size: 0.82rem;
  opacity: 0.5;
  margin-bottom: 8px;
  letter-spacing: 0.5px;
}

.article-card h3 {
  font-size: 1.15rem;
  margin-bottom: 10px;
  font-weight: 700;
  line-height: 1.4;
}

.article-card p {
  font-size: 0.9rem;
  opacity: 0.75;
  margin-bottom: 16px;
  line-height: 1.7;
}

.article-card .read-more {
  font-weight: 600;
  color: var(--primary);
  font-size: 0.9rem;
  transition: gap var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 4px;
}
.article-card .read-more:hover {
  gap: 10px;
}

/* ---------- 联系表单 ---------- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
}

.contact-info p {
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1rem;
}
.contact-info .label {
  font-weight: 600;
  min-width: 80px;
  color: var(--primary);
}

.contact-form {
  background: var(--glass-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  padding: 36px;
  box-shadow: var(--shadow);
}

.contact-form label {
  display: block;
  margin-bottom: 6px;
  font-weight: 600;
  font-size: 0.92rem;
}

.contact-form input,
.contact-form textarea {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-sm);
  font-size: 1rem;
  background: rgba(255, 255, 255, 0.04);
  color: var(--text);
  transition: border-color var(--transition), background var(--transition);
  font-family: var(--font);
}
.contact-form input:focus,
.contact-form textarea:focus {
  outline: none;
  border-color: var(--primary);
  background: rgba(255, 255, 255, 0.06);
}
.light .contact-form input,
.light .contact-form textarea {
  border: 1px solid rgba(0, 0, 0, 0.1);
  background: rgba(255, 255, 255, 0.6);
  color: #1a1a24;
}
.light .contact-form input:focus,
.light .contact-form textarea:focus {
  background: rgba(255, 255, 255, 0.8);
  border-color: var(--primary);
}

.contact-form textarea {
  resize: vertical;
  min-height: 110px;
}

.contact-form .btn {
  margin-top: 8px;
}

/* ---------- FOOTER ---------- */
footer {
  background: rgba(10, 10, 18, 0.95);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-top: 1px solid rgba(255, 255, 255, 0.04);
  color: rgba(255, 255, 255, 0.7);
  padding: 60px 0 30px;
  margin-top: 60px;
}
.light footer {
  background: rgba(245, 242, 237, 0.95);
  border-top: 1px solid rgba(0, 0, 0, 0.04);
  color: rgba(0, 0, 0, 0.6);
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 40px;
  margin-bottom: 40px;
}

.footer-grid h4 {
  color: #fff;
  margin-bottom: 20px;
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: 0.3px;
}
.light .footer-grid h4 {
  color: #1a1a24;
}

.footer-grid a {
  display: block;
  margin-bottom: 10px;
  color: rgba(255, 255, 255, 0.55);
  font-size: 0.9rem;
  transition: color var(--transition), padding-left var(--transition);
}
.footer-grid a:hover {
  color: var(--primary);
  padding-left: 4px;
}
.light .footer-grid a {
  color: rgba(0, 0, 0, 0.5);
}

.footer-grid p {
  font-size: 0.9rem;
  line-height: 1.6;
  opacity: 0.7;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  padding-top: 24px;
  text-align: center;
  font-size: 0.88rem;
  opacity: 0.6;
}
.light .footer-bottom {
  border-top: 1px solid rgba(0, 0, 0, 0.05);
}

/* ---------- 返回顶部 ---------- */
.back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: #0b0b14;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  font-weight: 700;
  box-shadow: 0 6px 24px rgba(240, 192, 64, 0.3);
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: opacity var(--transition), visibility var(--transition), transform var(--transition), box-shadow var(--transition);
  border: none;
  z-index: 999;
}
.back-to-top.show {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.back-to-top:hover {
  box-shadow: 0 8px 32px rgba(240, 192, 64, 0.5);
  transform: translateY(-3px) scale(1.05);
}

/* ---------- 滚动高亮（导航） ---------- */
.scroll-highlight {
  transition: background 0.4s ease;
}
.scroll-highlight.highlighted {
  background: rgba(240, 192, 64, 0.08);
  border-radius: var(--radius-sm);
}

/* ---------- 滚动入场动画 ---------- */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- 响应式 ---------- */
@media (max-width: 1024px) {
  .hero h1 {
    font-size: 3rem;
  }
  .about-grid {
    gap: 40px;
  }
}

@media (max-width: 768px) {
  .menu-toggle {
    display: block;
  }

  .nav-links {
    display: none;
    flex-direction: column;
    position: absolute;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: rgba(20, 20, 31, 0.96);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    padding: 24px 28px;
    gap: 16px;
    z-index: 999;
    border-bottom: 1px solid var(--glass-border);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.5);
  }
  .light .nav-links {
    background: rgba(255, 255, 255, 0.96);
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
  }
  .nav-links.active {
    display: flex;
  }

  .hero {
    min-height: 60vh;
    padding: 100px 0 80px;
  }
  .hero h1 {
    font-size: 2.2rem;
  }
  .hero p {
    font-size: 1rem;
    max-width: 100%;
  }

  .section {
    padding: 60px 0;
  }
  .section-title {
    font-size: 1.8rem;
    margin-bottom: 40px;
  }

  .about-grid {
    grid-template-columns: 1fr;
    gap: 30px;
  }
  .about-stats {
    grid-template-columns: 1fr 1fr;
    gap: 16px;
  }
  .stat-number {
    font-size: 2rem;
  }

  .contact-grid {
    grid-template-columns: 1fr;
    gap: 30px;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 24px;
  }

  .back-to-top {
    bottom: 20px;
    right: 20px;
    width: 42px;
    height: 42px;
    font-size: 1.2rem;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 16px;
  }
  .hero h1 {
    font-size: 1.8rem;
  }
  .hero .btn {
    padding: 12px 28px;
    font-size: 0.95rem;
  }
  .about-stats {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr;
  }
  .cards-grid,
  .testimonials-grid,
  .articles-grid {
    grid-template-columns: 1fr;
  }
}

/* ---------- 暗色模式适配（强制） ---------- */
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b0b14;
    --text: #e8e8f0;
    --card-bg: rgba(26, 26, 46, 0.55);
    --card-border: rgba(255, 255, 255, 0.06);
    --glass-bg: rgba(20, 20, 31, 0.65);
    --glass-border: rgba(255, 255, 255, 0.08);
    --shadow: 0 8px 32px rgba(0, 0, 0, 0.45);
    --shadow-hover: 0 12px 40px rgba(0, 0, 0, 0.6);
    --secondary: #14141f;
  }
}

/* ---------- 实用工具 ---------- */
.text-gradient {
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.glass {
  background: var(--glass-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
}

.shadow-glow {
  box-shadow: 0 0 30px rgba(240, 192, 64, 0.15);
}

/* ---------- 滚动条（Firefox） ---------- */
* {
  scrollbar-width: thin;
  scrollbar-color: var(--primary) var(--secondary);
}