/* =============================================
   Theme: 亿万28 · Aurora Gradient Light
   Style: Minimalist white + vibrant gradient accents,
          glassmorphism cards, bold typography
   Color palette: lavender (#f7f3fe) base,
                  purple-pink-cyan gradient as accent,
                  charcoal text
   ============================================= */

/* 自定义属性 (主题变量) */
:root {
  --color-bg: #f7f3fe;
  --color-bg-alt: #f0edf8;
  --color-text: #1e1b2e;
  --color-text-light: #6b6580;
  --color-primary: #7c3aed;
  --color-secondary: #ec4899;
  --color-tertiary: #06b6d4;
  --gradient-main: linear-gradient(135deg, #7c3aed, #ec4899, #06b6d4);
  --gradient-accent: linear-gradient(135deg, #ec4899, #06b6d4);
  --card-bg: rgba(255, 255, 255, 0.72);
  --card-border: rgba(124, 58, 237, 0.15);
  --shadow-soft: 0 8px 32px rgba(124, 58, 237, 0.08);
  --shadow-hover: 0 12px 40px rgba(124, 58, 237, 0.18);
  --radius-card: 16px;
  --radius-btn: 12px;
  --font-family: 'PingFang SC', 'Microsoft YaHei', system-ui, -apple-system, sans-serif;
  --transition: 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

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

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

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

.section {
  padding: 96px 0;
  position: relative;
}

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

/* 导航 — 固定顶部 (毛玻璃+渐变细线) */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: rgba(247, 243, 254, 0.82);
  backdrop-filter: blur(14px) saturate(1.1);
  -webkit-backdrop-filter: blur(14px) saturate(1.1);
  border-bottom: 1px solid rgba(124, 58, 237, 0.08);
  box-shadow: 0 1px 0 rgba(255,255,255,0.6) inset;
}

.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: 800;
  font-size: 1.25rem;
  text-decoration: none;
  color: var(--color-text);
  letter-spacing: -0.3px;
}

.logo-icon {
  width: 40px;
  height: 40px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  background: var(--gradient-main);
  color: #fff;
  box-shadow: 0 4px 12px rgba(124, 58, 237, 0.25);
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 28px;
  list-style: none;
}

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

.main-nav a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--gradient-main);
  border-radius: 2px;
  transition: width 0.35s ease;
}

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

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

.nav-cta {
  padding: 10px 24px !important;
  border-radius: var(--radius-btn);
  color: #fff !important;
  font-weight: 700;
  background: var(--gradient-main);
  box-shadow: 0 4px 14px rgba(124, 58, 237, 0.3);
  transition: var(--transition);
}

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

.nav-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(124, 58, 237, 0.4);
  color: #fff !important;
}

.menu-toggle {
  display: none;
  width: 28px;
  height: 28px;
  background: none;
  border: none;
  cursor: pointer;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  padding: 0;
}

.menu-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: var(--transition);
}

/* 首页Hero — 渐变文字 + 装饰光晕 */
.hero {
  min-height: 80vh;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
  padding-top: 80px;
}

.hero::before {
  content: '';
  position: absolute;
  top: -20%;
  right: -10%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(124,58,237,0.12) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: -10%;
  left: -5%;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(236,72,153,0.10) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

.hero-content {
  max-width: 720px;
  position: relative;
  z-index: 2;
}

.hero-eyebrow {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 700;
  padding: 6px 18px;
  border-radius: 40px;
  margin-bottom: 20px;
  background: rgba(124, 58, 237, 0.10);
  color: var(--color-primary);
  letter-spacing: 0.8px;
  text-transform: uppercase;
  backdrop-filter: blur(4px);
}

.hero h1 {
  font-size: 3.5rem;
  line-height: 1.15;
  margin-bottom: 24px;
  font-weight: 900;
  background: var(--gradient-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -1.2px;
}

.hero p {
  font-size: 1.15rem;
  opacity: 0.75;
  max-width: 560px;
  margin-bottom: 36px;
  color: var(--color-text-light);
  line-height: 1.7;
}

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

.hero-image {
  border-radius: 20px;
  overflow: hidden;
  box-shadow: 0 20px 60px rgba(124, 58, 237, 0.12);
}

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

/* 按钮 — 渐变 + 悬浮效果 */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 32px;
  border-radius: var(--radius-btn);
  font-weight: 700;
  cursor: pointer;
  border: none;
  text-decoration: none;
  transition: var(--transition);
  font-size: 0.95rem;
  letter-spacing: 0.3px;
}

.btn-primary {
  color: #fff;
  background: var(--gradient-main);
  box-shadow: 0 6px 20px rgba(124, 58, 237, 0.25);
}

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 10px 30px rgba(124, 58, 237, 0.35);
}

.btn-outline {
  background: transparent;
  border: 1.5px solid;
  border-image: var(--gradient-main) 1;
  color: var(--color-primary);
  background-clip: padding-box;
  -webkit-background-clip: padding-box;
}

.btn-outline:hover {
  background: var(--gradient-main);
  color: #fff;
  border: 1.5px solid transparent;
}

/* 标签/标题 */
.section-label {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 2.5px;
  margin-bottom: 12px;
  color: var(--color-primary);
  text-transform: uppercase;
  background: rgba(124,58,237,0.08);
  padding: 4px 16px;
  border-radius: 40px;
}

.section-title {
  font-size: 2.2rem;
  margin-bottom: 16px;
  font-weight: 800;
  letter-spacing: -0.5px;
  color: var(--color-text);
}

.section-desc {
  max-width: 600px;
  opacity: 0.7;
  margin-bottom: 48px;
  font-size: 1rem;
  color: var(--color-text-light);
}

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

.category-card {
  border-radius: var(--radius-card);
  padding: 32px 28px;
  background: var(--card-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--card-border);
  transition: var(--transition);
  box-shadow: var(--shadow-soft);
}

.category-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-hover);
  border-color: rgba(124, 58, 237, 0.3);
}

.card-icon {
  width: 52px;
  height: 52px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  font-size: 1.5rem;
  background: var(--gradient-main);
  color: #fff;
  box-shadow: 0 6px 16px rgba(124,58,237,0.2);
}

.card-link {
  font-weight: 700;
  font-size: 0.9rem;
  text-decoration: none;
  color: var(--color-primary);
  display: inline-flex;
  align-items: center;
  gap: 4px;
  transition: var(--transition);
}

.card-link:hover {
  gap: 8px;
  color: var(--color-secondary);
}

/* 特性块 (交替图文) */
.feature-block {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.feature-image {
  border-radius: 20px;
  overflow: hidden;
  box-shadow: 0 16px 48px rgba(124,58,237,0.10);
}

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

.feature-text {
  position: relative;
}

.feature-list {
  list-style: none;
  margin-top: 8px;
}

.feature-list li {
  padding: 10px 0;
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1rem;
  color: var(--color-text-light);
}

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

/* 数据条 (统计数字) */
.stats-bar {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  text-align: center;
}

.stat-item {
  padding: 32px 20px;
  border-radius: var(--radius-card);
  background: var(--card-bg);
  backdrop-filter: blur(8px);
  border: 1px solid var(--card-border);
  transition: var(--transition);
}

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

.stat-number {
  font-size: 2.6rem;
  font-weight: 900;
  background: var(--gradient-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.2;
}

.stat-label {
  font-size: 0.9rem;
  opacity: 0.6;
  margin-top: 8px;
  color: var(--color-text-light);
  font-weight: 500;
}

/* 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-card);
  overflow: hidden;
  background: var(--card-bg);
  backdrop-filter: blur(8px);
  border: 1px solid var(--card-border);
  transition: var(--transition);
  box-shadow: var(--shadow-soft);
}

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

.content-wall-item img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  transition: var(--transition);
}

.content-wall-item:hover img {
  transform: scale(1.03);
}

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

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

.content-wall-body p {
  font-size: 0.9rem;
  color: var(--color-text-light);
  opacity: 0.8;
}

/* FAQ — 彩色边框 */
.faq-list {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  border: 1px solid var(--card-border);
  border-radius: 14px;
  margin-bottom: 10px;
  overflow: hidden;
  cursor: pointer;
  background: var(--card-bg);
  backdrop-filter: blur(6px);
  transition: var(--transition);
}

.faq-item:hover {
  border-color: rgba(124,58,237,0.3);
}

.faq-item .faq-question {
  padding: 18px 24px;
  font-weight: 700;
  font-size: 1rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--color-text);
}

.faq-item .faq-question::after {
  content: '+';
  font-size: 1.4rem;
  color: var(--color-primary);
  transition: var(--transition);
  font-weight: 300;
}

.faq-item.open .faq-question::after {
  content: '−';
  transform: rotate(0deg);
}

.faq-item .faq-answer {
  padding: 0 24px 18px;
  display: none;
  opacity: 0.75;
  color: var(--color-text-light);
  line-height: 1.7;
}

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

/* CTA横幅 — 全宽渐变 */
.cta-banner {
  padding: 72px 32px;
  text-align: center;
  border-radius: 24px;
  background: var(--gradient-main);
  color: #fff;
  box-shadow: 0 20px 60px rgba(124, 58, 237, 0.25);
}

.cta-banner h2 {
  color: #fff;
  font-size: 2.2rem;
  font-weight: 800;
  margin-bottom: 16px;
}

.cta-banner p {
  opacity: 0.85;
  max-width: 500px;
  margin: 0 auto 28px;
  font-size: 1.05rem;
}

.cta-banner .btn-primary {
  background: #fff;
  color: var(--color-primary);
  box-shadow: 0 6px 20px rgba(0,0,0,0.08);
}

.cta-banner .btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 10px 28px rgba(0,0,0,0.12);
}

/* 页脚 — 浅色渐变 */
.site-footer {
  padding: 72px 0 32px;
  background: var(--color-bg-alt);
  border-top: 1px solid rgba(124,58,237,0.06);
}

.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 {
  margin-bottom: 8px;
}

.footer-brand p {
  font-size: 0.9rem;
  color: var(--color-text-light);
  opacity: 0.7;
}

.footer-col h5 {
  font-weight: 700;
  font-size: 0.9rem;
  margin-bottom: 14px;
  color: var(--color-text);
  text-transform: uppercase;
  letter-spacing: 1px;
}

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

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

.footer-col ul li a {
  text-decoration: none;
  font-size: 0.9rem;
  color: var(--color-text-light);
  opacity: 0.7;
  transition: var(--transition);
}

.footer-col ul li a:hover {
  opacity: 1;
  color: var(--color-primary);
}

.footer-bottom {
  border-top: 1px solid rgba(124,58,237,0.10);
  margin-top: 48px;
  padding-top: 24px;
  text-align: center;
  font-size: 0.85rem;
  color: var(--color-text-light);
  opacity: 0.6;
}

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

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

.seo-description {
  max-width: 600px;
  margin: 0 auto 48px;
  opacity: 0.7;
  font-size: 1rem;
}

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

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

/* =============================================
   响应式
   ============================================= */
@media (max-width: 1024px) {
  .hero h1 {
    font-size: 2.8rem;
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .section {
    padding: 64px 0;
  }

  .hero {
    min-height: auto;
    padding: 100px 0 60px;
  }

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

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

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

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

  .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: rgba(247, 243, 254, 0.98);
    backdrop-filter: blur(14px);
    padding: 24px 32px;
    gap: 16px;
    border-bottom: 1px solid var(--card-border);
    box-shadow: var(--shadow-soft);
  }

  .main-nav.open a {
    font-size: 1rem;
    padding: 8px 0;
  }

  .section-title {
    font-size: 1.7rem;
  }

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

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

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

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

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

  .btn {
    justify-content: center;
  }

  .stat-number {
    font-size: 2rem;
  }
}