/* ============================================
   ng体育 — 动感无限 | 烈焰动感设计系统
   Awwwards 风格 · 斜线切割 + 色彩碰撞
   ============================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800;900&display=swap');

:root {
  /* 主色 — 烈焰橙蓝 */
  --primary: #E85D3A;
  --primary-light: #FF8C42;
  --primary-dark: #C9442A;
  --secondary: #2D4059;
  --accent: #FFD166;
  --accent-green: #4ECDC4;
  --accent-pink: #FF6B8A;

  /* 背景色 — 全部浅色 */
  --bg: #FDF6EC;
  --bg-alt: #FFFBF5;
  --bg-card: #FFFFFF;
  --bg-section-alt: #F8F0E8;

  /* 文字 */
  --text: #2D4059;
  --text-light: #6B7B8D;
  --text-white: #FFFFFF;

  /* 边框与阴影 */
  --border: #E8DDD0;
  --border-light: #F0E8DE;
  --shadow-sm: 0 2px 8px rgba(45, 64, 89, 0.06);
  --shadow-md: 0 8px 24px rgba(232, 93, 58, 0.12);
  --shadow-lg: 0 16px 48px rgba(232, 93, 58, 0.18);

  /* 圆角 */
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;

  /* 字体 */
  --font: 'Inter', system-ui, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-weight-bold: 800;
  --font-weight-black: 900;

  /* 斜线角度 */
  --skew-angle: -6deg;
}

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

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

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  overflow-x: hidden;
}

/* ===== 核心布局 ===== */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 100px 0;
  position: relative;
}

.section:nth-child(even) {
  background: var(--bg-section-alt);
}

/* ===== 斜线装饰元素 ===== */
.section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 6px;
  background: linear-gradient(90deg, var(--primary), var(--accent), var(--accent-green));
  opacity: 0.3;
  pointer-events: none;
}

.section:first-of-type::before {
  display: none;
}

/* ===== 导航 — 固定顶部 ===== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: rgba(253, 246, 236, 0.88);
  backdrop-filter: blur(16px) saturate(1.2);
  border-bottom: 2px solid var(--border-light);
  transition: box-shadow 0.3s;
}

.site-header:hover {
  box-shadow: var(--shadow-sm);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

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

.logo::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  border-radius: 2px;
  opacity: 0;
  transition: opacity 0.3s;
}

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

.logo-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: #fff;
  font-weight: 900;
  position: relative;
  overflow: hidden;
}

.logo-icon::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -50%;
  width: 100%;
  height: 100%;
  background: rgba(255, 255, 255, 0.15);
  transform: rotate(45deg);
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}

.main-nav a {
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text);
  position: relative;
  padding: 4px 0;
  transition: color 0.3s;
  letter-spacing: 0.3px;
}

.main-nav a::before {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2.5px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  border-radius: 2px;
  transition: width 0.35s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

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

.main-nav a:hover::before {
  width: 100%;
}

.nav-cta {
  padding: 10px 24px !important;
  border-radius: var(--radius-md) !important;
  background: linear-gradient(135deg, var(--primary), var(--primary-light)) !important;
  color: #fff !important;
  font-weight: 700 !important;
  box-shadow: 0 4px 14px rgba(232, 93, 58, 0.35);
  transition: transform 0.3s, box-shadow 0.3s !important;
}

.nav-cta::before {
  display: none !important;
}

.nav-cta:hover {
  transform: translateY(-2px) scale(1.02) !important;
  box-shadow: 0 6px 20px rgba(232, 93, 58, 0.45) !important;
  color: #fff !important;
}

.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  border-radius: var(--radius-sm);
}

.menu-toggle span {
  display: block;
  width: 26px;
  height: 3px;
  background: var(--secondary);
  border-radius: 3px;
  transition: 0.3s;
}

/* ===== Hero ===== */
.hero {
  min-height: 85vh;
  display: flex;
  align-items: center;
  position: relative;
  padding-top: 72px;
  overflow: hidden;
  background: var(--bg);
}

.hero::before {
  content: '';
  position: absolute;
  top: -20%;
  right: -10%;
  width: 60%;
  height: 120%;
  background: linear-gradient(135deg, rgba(232, 93, 58, 0.06), rgba(255, 209, 102, 0.08));
  transform: skew(var(--skew-angle));
  border-radius: var(--radius-xl);
  pointer-events: none;
  z-index: 0;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: 0;
  right: 5%;
  width: 300px;
  height: 300px;
  background: radial-gradient(circle, rgba(78, 205, 196, 0.08), transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

.hero .container {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}

.hero-content {
  max-width: 640px;
}

.hero-eyebrow {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 3px;
  padding: 6px 18px;
  border-radius: 50px;
  margin-bottom: 20px;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: #fff;
  text-transform: uppercase;
  box-shadow: 0 4px 12px rgba(232, 93, 58, 0.25);
}

.hero h1 {
  font-size: 3.6rem;
  line-height: 1.08;
  margin-bottom: 20px;
  font-weight: var(--font-weight-black);
  color: var(--secondary);
  letter-spacing: -1.5px;
}

.hero h1 .text-accent {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero p {
  font-size: 1.15rem;
  color: var(--text-light);
  max-width: 520px;
  margin-bottom: 36px;
  line-height: 1.7;
}

.hero-buttons {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.hero-image {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  transform: perspective(1200px) rotateY(-3deg) rotateX(2deg);
  transition: transform 0.5s ease;
  border: 2px solid var(--border-light);
}

.hero-image:hover {
  transform: perspective(1200px) rotateY(0deg) rotateX(0deg);
}

.hero-image::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(232, 93, 58, 0.15), transparent 50%);
  z-index: 1;
  pointer-events: none;
}

.hero-image img {
  width: 100%;
  height: auto;
  display: block;
  transition: transform 0.6s;
}

.hero-image:hover img {
  transform: scale(1.03);
}

/* ===== 按钮 ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 32px;
  border-radius: var(--radius-md);
  font-weight: 700;
  font-size: 0.95rem;
  cursor: pointer;
  border: none;
  text-decoration: none;
  transition: all 0.35s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  letter-spacing: 0.3px;
  position: relative;
  overflow: hidden;
}

.btn::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  background: rgba(255, 255, 255, 0.15);
  border-radius: 50%;
  transform: translate(-50%, -50%);
  transition: width 0.6s, height 0.6s;
}

.btn:active::after {
  width: 300px;
  height: 300px;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: #fff;
  box-shadow: 0 4px 16px rgba(232, 93, 58, 0.35);
}

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 28px rgba(232, 93, 58, 0.45);
}

.btn-outline {
  background: transparent;
  border: 2px solid var(--primary);
  color: var(--primary);
}

.btn-outline:hover {
  background: var(--primary);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(232, 93, 58, 0.25);
}

/* ===== 标签/标题 ===== */
.section-label {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 3px;
  text-transform: uppercase;
  padding: 6px 16px;
  border-radius: 50px;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: #fff;
  margin-bottom: 16px;
  box-shadow: 0 4px 12px rgba(232, 93, 58, 0.2);
}

.section-title {
  font-size: 2.6rem;
  font-weight: var(--font-weight-black);
  margin-bottom: 16px;
  color: var(--secondary);
  letter-spacing: -0.5px;
  line-height: 1.15;
}

.section-title .text-accent {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.section-desc {
  max-width: 620px;
  color: var(--text-light);
  font-size: 1.05rem;
  margin-bottom: 48px;
  line-height: 1.7;
}

/* ===== 卡片网格 ===== */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 28px;
}

.category-card {
  background: var(--bg-card);
  border-radius: var(--radius-md);
  padding: 32px 28px;
  border: 2px solid var(--border-light);
  transition: all 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  position: relative;
  overflow: hidden;
}

.category-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, var(--primary), var(--accent), var(--accent-green));
  opacity: 0;
  transition: opacity 0.4s;
}

.category-card:hover {
  transform: translateY(-6px) scale(1.01);
  box-shadow: var(--shadow-md);
  border-color: var(--primary);
}

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

.category-card:nth-child(1)::before {
  background: linear-gradient(90deg, var(--primary), var(--primary-light));
}

.category-card:nth-child(2)::before {
  background: linear-gradient(90deg, var(--accent-green), var(--accent));
}

.category-card:nth-child(3)::before {
  background: linear-gradient(90deg, var(--accent), var(--primary-light));
}

.category-card:nth-child(4)::before {
  background: linear-gradient(90deg, var(--accent-pink), var(--primary));
}

.category-card:nth-child(5)::before {
  background: linear-gradient(90deg, var(--secondary), var(--accent-green));
}

.card-icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  background: linear-gradient(135deg, rgba(232, 93, 58, 0.1), rgba(255, 209, 102, 0.1));
  color: var(--primary);
  margin-bottom: 20px;
  transition: transform 0.3s;
}

.category-card:hover .card-icon {
  transform: scale(1.1) rotate(-5deg);
}

.category-card h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--secondary);
}

.category-card p {
  color: var(--text-light);
  font-size: 0.9rem;
  line-height: 1.6;
  margin-bottom: 16px;
}

.card-link {
  font-weight: 700;
  font-size: 0.85rem;
  text-decoration: none;
  color: var(--primary);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: gap 0.3s;
}

.card-link:hover {
  gap: 12px;
}

/* ===== 特性块 ===== */
.feature-block {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}

.feature-block:nth-child(even) .feature-image {
  order: 2;
}

.feature-block:nth-child(even) .feature-text {
  order: 1;
}

.feature-image {
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  position: relative;
  border: 2px solid var(--border-light);
  transform: perspective(1000px) rotateY(2deg);
  transition: transform 0.6s;
}

.feature-image:hover {
  transform: perspective(1000px) rotateY(0deg);
}

.feature-image::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(232, 93, 58, 0.08), transparent 50%);
  pointer-events: none;
}

.feature-image img {
  width: 100%;
  height: auto;
  display: block;
  transition: transform 0.6s;
}

.feature-image:hover img {
  transform: scale(1.03);
}

.feature-text {
  padding: 8px 0;
}

.feature-text .section-label {
  margin-bottom: 12px;
}

.feature-text h3 {
  font-size: 1.8rem;
  font-weight: var(--font-weight-black);
  color: var(--secondary);
  margin-bottom: 16px;
  line-height: 1.2;
}

.feature-text p {
  color: var(--text-light);
  line-height: 1.7;
  margin-bottom: 20px;
}

.feature-list {
  list-style: none;
  margin-top: 16px;
}

.feature-list li {
  padding: 8px 0;
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 500;
  color: var(--text);
  border-bottom: 1px dashed var(--border-light);
}

.feature-list li:last-child {
  border-bottom: none;
}

.feature-list li::before {
  content: '✦';
  font-weight: 700;
  color: var(--primary);
  font-size: 1.1rem;
}

/* ===== 数据条 ===== */
.stats-bar {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 28px;
  text-align: center;
  position: relative;
}

.stats-bar::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 10%;
  right: 10%;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--border), transparent);
  transform: translateY(-50%);
  pointer-events: none;
}

.stat-item {
  padding: 32px 20px;
  border-radius: var(--radius-md);
  background: var(--bg-card);
  border: 2px solid var(--border-light);
  transition: all 0.4s;
  position: relative;
  z-index: 1;
}

.stat-item:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--primary);
}

.stat-item:nth-child(1) {
  border-top: 4px solid var(--primary);
}

.stat-item:nth-child(2) {
  border-top: 4px solid var(--accent);
}

.stat-item:nth-child(3) {
  border-top: 4px solid var(--accent-green);
}

.stat-item:nth-child(4) {
  border-top: 4px solid var(--accent-pink);
}

.stat-number {
  font-size: 2.8rem;
  font-weight: var(--font-weight-black);
  color: var(--secondary);
  line-height: 1;
  margin-bottom: 4px;
}

.stat-item:nth-child(1) .stat-number {
  color: var(--primary);
}

.stat-item:nth-child(2) .stat-number {
  color: var(--accent);
}

.stat-item:nth-child(3) .stat-number {
  color: var(--accent-green);
}

.stat-item:nth-child(4) .stat-number {
  color: var(--accent-pink);
}

.stat-label {
  font-size: 0.9rem;
  color: var(--text-light);
  font-weight: 500;
  margin-top: 6px;
}

/* ===== 内容墙 ===== */
.content-wall {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 28px;
}

.content-wall-item {
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--bg-card);
  border: 2px solid var(--border-light);
  transition: all 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  position: relative;
}

.content-wall-item::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  z-index: 2;
  opacity: 0;
  transition: opacity 0.4s;
}

.content-wall-item:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-md);
  border-color: var(--primary);
}

.content-wall-item:hover::before {
  opacity: 1;
}

.content-wall-item img {
  width: 100%;
  height: 220px;
  object-fit: cover;
  display: block;
  transition: transform 0.6s;
}

.content-wall-item:hover img {
  transform: scale(1.05);
}

.content-wall-body {
  padding: 24px;
}

.content-wall-body .tag {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  padding: 4px 12px;
  border-radius: 50px;
  background: rgba(232, 93, 58, 0.1);
  color: var(--primary);
  margin-bottom: 12px;
}

.content-wall-body h4 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--secondary);
  margin-bottom: 8px;
  line-height: 1.3;
}

.content-wall-body p {
  color: var(--text-light);
  font-size: 0.85rem;
  line-height: 1.6;
}

/* ===== FAQ ===== */
.faq-list {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  border: 2px solid var(--border-light);
  border-radius: var(--radius-md);
  margin-bottom: 12px;
  overflow: hidden;
  cursor: pointer;
  transition: all 0.3s;
  background: var(--bg-card);
}

.faq-item:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow-sm);
}

.faq-item.open {
  border-color: var(--primary);
  box-shadow: var(--shadow-sm);
}

.faq-item .faq-question {
  padding: 20px 24px;
  font-weight: 700;
  font-size: 1.05rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--secondary);
  transition: color 0.3s;
  user-select: none;
}

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

.faq-item .faq-question::after {
  content: '+';
  font-size: 1.5rem;
  font-weight: 300;
  color: var(--text-light);
  transition: transform 0.3s, color 0.3s;
}

.faq-item.open .faq-question::after {
  content: '−';
  color: var(--primary);
  transform: rotate(180deg);
}

.faq-item .faq-answer {
  padding: 0 24px 20px;
  display: none;
  color: var(--text-light);
  line-height: 1.7;
  font-size: 0.95rem;
}

.faq-item.open .faq-answer {
  display: block;
  animation: fadeSlideIn 0.3s ease;
}

@keyframes fadeSlideIn {
  from {
    opacity: 0;
    transform: translateY(-8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ===== CTA横幅 ===== */
.cta-banner {
  padding: 72px 32px;
  text-align: center;
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, var(--primary), var(--primary-light), var(--accent));
  color: #fff;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}

.cta-banner::before {
  content: '';
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(
    45deg,
    transparent,
    transparent 20px,
    rgba(255, 255, 255, 0.04) 20px,
    rgba(255, 255, 255, 0.04) 40px
  );
  pointer-events: none;
}

.cta-banner::after {
  content: '';
  position: absolute;
  top: -60%;
  right: -10%;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.1), transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

.cta-banner h2 {
  color: #fff;
  font-size: 2.2rem;
  font-weight: var(--font-weight-black);
  margin-bottom: 16px;
  position: relative;
  z-index: 1;
}

.cta-banner p {
  color: rgba(255, 255, 255, 0.85);
  max-width: 560px;
  margin: 0 auto 28px;
  font-size: 1.05rem;
  position: relative;
  z-index: 1;
}

.cta-banner .btn-primary {
  background: #fff;
  color: var(--primary);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1);
  position: relative;
  z-index: 1;
}

.cta-banner .btn-primary:hover {
  transform: translateY(-3px) scale(1.02);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
}

/* ===== 页脚 ===== */
.site-footer {
  padding: 64px 0 32px;
  background: var(--bg-alt);
  border-top: 3px solid var(--border-light);
  position: relative;
}

.site-footer::before {
  content: '';
  position: absolute;
  top: -3px;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--accent), var(--accent-green), var(--accent-pink));
  opacity: 0.5;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.footer-brand .logo {
  font-size: 1.3rem;
}

.footer-brand p {
  color: var(--text-light);
  font-size: 0.9rem;
  line-height: 1.7;
  max-width: 320px;
}

.footer-col h4 {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--secondary);
  margin-bottom: 16px;
  letter-spacing: 0.5px;
  text-transform: uppercase;
}

.footer-col ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-col ul a {
  text-decoration: none;
  color: var(--text-light);
  font-size: 0.9rem;
  transition: color 0.3s, padding-left 0.3s;
  display: inline-block;
}

.footer-col ul a:hover {
  color: var(--primary);
  padding-left: 4px;
}

.footer-bottom {
  border-top: 2px solid var(--border-light);
  margin-top: 48px;
  padding-top: 24px;
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-light);
}

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

/* ===== 工具类 ===== */
.text-accent {
  color: var(--primary);
}

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

.seo-description {
  max-width: 600px;
  margin: 0 auto 48px;
  color: var(--text-light);
  line-height: 1.7;
}

.mt-0 {
  margin-top: 0;
}

.mb-0 {
  margin-bottom: 0;
}

/* ===== 额外的装饰性几何元素 ===== */
.section .container {
  position: relative;
}

.section .container::after {
  content: '';
  position: absolute;
  bottom: -20px;
  right: 20px;
  width: 80px;
  height: 80px;
  border: 3px solid var(--border);
  border-radius: var(--radius-sm);
  opacity: 0.4;
  pointer-events: none;
  transform: rotate(15deg);
}

.section:nth-child(even) .container::after {
  border-color: var(--primary);
  opacity: 0.15;
}

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
  .hero .container {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .hero-content {
    max-width: 100%;
    text-align: center;
  }

  .hero p {
    margin: 0 auto 36px;
  }

  .hero-buttons {
    justify-content: center;
  }

  .hero h1 {
    font-size: 2.8rem;
  }

  .hero-image {
    max-width: 600px;
    margin: 0 auto;
    transform: none;
  }

  .hero-image:hover {
    transform: none;
  }

  .feature-block {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .feature-block:nth-child(even) .feature-image {
    order: 1;
  }

  .feature-block:nth-child(even) .feature-text {
    order: 2;
  }

  .stats-bar {
    grid-template-columns: repeat(2, 1fr);
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }
}

@media (max-width: 768px) {
  .section {
    padding: 72px 0;
  }

  .main-nav {
    display: none;
  }

  .menu-toggle {
    display: flex;
  }

  .main-nav.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 72px;
    left: 0;
    width: 100%;
    background: var(--bg);
    padding: 24px 32px;
    gap: 16px;
    border-bottom: 3px solid var(--border-light);
    box-shadow: var(--shadow-md);
    animation: navSlideDown 0.3s ease;
  }

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

  .main-nav.open a {
    font-size: 1.05rem;
    padding: 8px 0;
  }

  .main-nav.open .nav-cta {
    text-align: center;
    margin-top: 8px;
  }

  .hero h1 {
    font-size: 2.2rem;
  }

  .section-title {
    font-size: 2rem;
  }

  .cards-grid {
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 20px;
  }

  .content-wall {
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 20px;
  }

  .stats-bar {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
  }

  .stats-bar::before {
    display: none;
  }

  .stat-item {
    padding: 24px 16px;
  }

  .stat-number {
    font-size: 2.2rem;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 28px;
  }
}

@media (max-width: 480px) {
  .cards-grid,
  .content-wall,
  .stats-bar {
    grid-template-columns: 1fr;
  }

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

  .hero-buttons {
    flex-direction: column;
    align-items: stretch;
  }

  .hero h1 {
    font-size: 1.8rem;
  }

  .section-title {
    font-size: 1.6rem;
  }

  .hero {
    min-height: 60vh;
  }

  .cta-banner {
    padding: 48px 20px;
  }

  .cta-banner h2 {
    font-size: 1.6rem;
  }

  .btn {
    justify-content: center;
    padding: 14px 24px;
  }
}

/* ===== 自定义滚动条 ===== */
::-webkit-scrollbar {
  width: 8px;
}

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

::-webkit-scrollbar-thumb {
  background: linear-gradient(180deg, var(--primary), var(--accent));
  border-radius: 4px;
}

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

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