/* ===========================================
   “91网” 设计系统 — 柔光水彩·杂志解构
   风格：浅色背景 + 水彩渐变 + 不规则排版
   主色：#E8F0FE (冰蓝底) + #B8E4D0 (薄荷) + #FFC9B9 (珊瑚)
   辅色：#2D3A4A (深灰蓝)
   =========================================== */

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

body {
  font-family: system-ui, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  overflow-x: hidden;
  background: #E8F0FE;
  color: #2D3A4A;
  line-height: 1.6;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

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

.section:nth-child(even) {
  background: linear-gradient(135deg, #f0f7ff 0%, #e8f4f0 100%);
}

/* ===== 水彩纹理背景 ===== */
.section::before {
  content: '';
  position: absolute;
  top: -40px;
  right: -80px;
  width: 300px;
  height: 300px;
  background: radial-gradient(circle at 30% 50%, rgba(184, 228, 208, 0.35), transparent 70%);
  border-radius: 50%;
  pointer-events: none;
  z-index: 0;
}

.section::after {
  content: '';
  position: absolute;
  bottom: -60px;
  left: -40px;
  width: 250px;
  height: 250px;
  background: radial-gradient(circle at 70% 30%, rgba(255, 201, 185, 0.3), transparent 70%);
  border-radius: 50%;
  pointer-events: none;
  z-index: 0;
}

.section > .container {
  position: relative;
  z-index: 1;
}

/* ===== 导航 ===== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: rgba(232, 240, 254, 0.85);
  backdrop-filter: blur(16px) saturate(1.2);
  border-bottom: 1px solid rgba(45, 58, 74, 0.06);
  box-shadow: 0 2px 20px rgba(184, 228, 208, 0.15);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 700;
  font-size: 1.25rem;
  text-decoration: none;
  color: #2D3A4A;
  letter-spacing: 1px;
}

.logo-icon {
  width: 40px;
  height: 40px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  background: linear-gradient(135deg, #B8E4D0, #FFC9B9);
  color: #fff;
  box-shadow: 0 4px 12px rgba(184, 228, 208, 0.4);
}

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

.main-nav a {
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  transition: 0.3s;
  color: #2D3A4A;
  position: relative;
  padding: 4px 0;
}

.main-nav a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, #B8E4D0, #FFC9B9);
  transition: width 0.3s ease;
}

.main-nav a:hover {
  color: #2D3A4A;
}

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

.nav-cta {
  padding: 10px 24px;
  border-radius: 50px;
  color: #fff !important;
  font-weight: 600;
  background: linear-gradient(135deg, #B8E4D0, #FFC9B9);
  box-shadow: 0 4px 14px rgba(184, 228, 208, 0.35);
  transition: all 0.3s ease;
}

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

.nav-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(255, 201, 185, 0.4);
}

.menu-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: #2D3A4A;
  padding: 4px 8px;
  border-radius: 8px;
  transition: background 0.2s;
}

.menu-toggle:hover {
  background: rgba(184, 228, 208, 0.3);
}

/* ===== Hero ===== */
.hero {
  min-height: 80vh;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
  padding-top: 68px;
}

.hero::before {
  content: '';
  position: absolute;
  top: -20%;
  right: -10%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(184, 228, 208, 0.25), transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: -15%;
  left: -5%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(255, 201, 185, 0.2), transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

.hero-content {
  max-width: 720px;
  position: relative;
  z-index: 1;
}

.hero-eyebrow {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 3px;
  padding: 6px 18px;
  border-radius: 50px;
  margin-bottom: 20px;
  background: rgba(184, 228, 208, 0.3);
  color: #2D3A4A;
  text-transform: uppercase;
}

.hero h1 {
  font-size: 3.2rem;
  line-height: 1.15;
  margin-bottom: 20px;
  font-weight: 800;
  letter-spacing: -0.5px;
  background: linear-gradient(135deg, #2D3A4A 30%, #B8E4D0 70%, #FFC9B9);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

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

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

.hero-image {
  border-radius: 20px;
  overflow: hidden;
  box-shadow: 0 20px 40px rgba(184, 228, 208, 0.2);
  position: relative;
}

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

/* ===== 按钮 ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 32px;
  border-radius: 50px;
  font-weight: 600;
  cursor: pointer;
  border: none;
  text-decoration: none;
  transition: all 0.3s ease;
  font-size: 0.95rem;
}

.btn-primary {
  color: #fff;
  background: linear-gradient(135deg, #B8E4D0, #FFC9B9);
  box-shadow: 0 6px 20px rgba(184, 228, 208, 0.3);
}

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 10px 30px rgba(255, 201, 185, 0.35);
}

.btn-outline {
  background: transparent;
  border: 2px solid rgba(45, 58, 74, 0.2);
  color: #2D3A4A;
}

.btn-outline:hover {
  border-color: #B8E4D0;
  background: rgba(184, 228, 208, 0.1);
  transform: translateY(-2px);
}

/* ===== 标签/标题 ===== */
.section-label {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 3px;
  text-transform: uppercase;
  margin-bottom: 12px;
  padding: 4px 0;
  color: #2D3A4A;
  opacity: 0.6;
}

.section-title {
  font-size: 2.4rem;
  margin-bottom: 16px;
  font-weight: 800;
  letter-spacing: -0.3px;
  line-height: 1.2;
}

.section-desc {
  max-width: 600px;
  opacity: 0.7;
  margin-bottom: 48px;
  font-size: 1.05rem;
  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 {
  border-radius: 20px;
  padding: 32px;
  border: 1px solid rgba(184, 228, 208, 0.2);
  background: rgba(255, 255, 255, 0.6);
  backdrop-filter: blur(8px);
  transition: all 0.4s ease;
  position: relative;
  overflow: hidden;
}

.category-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(135deg, rgba(184, 228, 208, 0.08), rgba(255, 201, 185, 0.08));
  opacity: 0;
  transition: opacity 0.4s ease;
}

.category-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 16px 40px rgba(184, 228, 208, 0.2);
  border-color: #B8E4D0;
}

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

.card-icon {
  width: 52px;
  height: 52px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  font-size: 1.4rem;
  background: linear-gradient(135deg, #B8E4D0, #FFC9B9);
  color: #fff;
  box-shadow: 0 4px 12px rgba(184, 228, 208, 0.3);
}

.card-link {
  font-weight: 600;
  font-size: 0.85rem;
  text-decoration: none;
  color: #2D3A4A;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: gap 0.3s;
}

.card-link:hover {
  gap: 12px;
  color: #B8E4D0;
}

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

.feature-image {
  border-radius: 20px;
  overflow: hidden;
  box-shadow: 0 16px 32px rgba(184, 228, 208, 0.15);
}

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

.feature-text {
  padding: 20px 0;
}

.feature-list {
  list-style: none;
}

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

.feature-list li::before {
  content: '✦';
  font-weight: 700;
  color: #FFC9B9;
  font-size: 1.1rem;
}

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

.stat-item {
  padding: 32px 24px;
  border-radius: 20px;
  border: 1px solid rgba(184, 228, 208, 0.15);
  background: rgba(255, 255, 255, 0.5);
  backdrop-filter: blur(6px);
  transition: all 0.3s ease;
}

.stat-item:hover {
  background: rgba(255, 255, 255, 0.8);
  box-shadow: 0 8px 24px rgba(184, 228, 208, 0.15);
  transform: translateY(-4px);
}

.stat-number {
  font-size: 2.6rem;
  font-weight: 800;
  background: linear-gradient(135deg, #B8E4D0, #FFC9B9);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stat-label {
  font-size: 0.9rem;
  opacity: 0.6;
  margin-top: 8px;
  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: 20px;
  overflow: hidden;
  border: 1px solid rgba(184, 228, 208, 0.15);
  background: rgba(255, 255, 255, 0.5);
  backdrop-filter: blur(6px);
  transition: all 0.4s ease;
}

.content-wall-item:hover {
  transform: translateY(-6px);
  box-shadow: 0 16px 40px rgba(184, 228, 208, 0.15);
  border-color: #B8E4D0;
}

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

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

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

.content-wall-body h3 {
  font-size: 1.1rem;
  margin-bottom: 8px;
  font-weight: 700;
}

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

.faq-item {
  border: 1px solid rgba(184, 228, 208, 0.2);
  border-radius: 16px;
  margin-bottom: 10px;
  overflow: hidden;
  cursor: pointer;
  background: rgba(255, 255, 255, 0.4);
  backdrop-filter: blur(4px);
  transition: all 0.3s ease;
}

.faq-item:hover {
  border-color: #B8E4D0;
  background: rgba(255, 255, 255, 0.7);
}

.faq-item .faq-question {
  padding: 18px 24px;
  font-weight: 600;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 1rem;
}

.faq-item .faq-question::after {
  content: '+';
  font-size: 1.4rem;
  font-weight: 300;
  transition: transform 0.3s ease;
  color: #B8E4D0;
}

.faq-item.open .faq-question::after {
  transform: rotate(45deg);
}

.faq-item .faq-answer {
  padding: 0 24px 20px;
  display: none;
  opacity: 0.75;
  line-height: 1.7;
}

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

/* ===== CTA横幅 ===== */
.cta-banner {
  padding: 64px 32px;
  text-align: center;
  border-radius: 24px;
  background: linear-gradient(135deg, #B8E4D0, #FFC9B9);
  color: #fff;
  position: relative;
  overflow: hidden;
}

.cta-banner::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(255,255,255,0.1), transparent 70%);
  border-radius: 50%;
}

.cta-banner h2 {
  color: #fff;
  font-size: 2rem;
  margin-bottom: 16px;
  position: relative;
}

.cta-banner p {
  opacity: 0.9;
  max-width: 500px;
  margin: 0 auto 28px;
  position: relative;
}

.cta-banner .btn-primary {
  background: #fff;
  color: #2D3A4A;
  box-shadow: 0 4px 16px rgba(0,0,0,0.08);
}

.cta-banner .btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 28px rgba(0,0,0,0.12);
}

/* ===== 页脚 ===== */
.site-footer {
  padding: 64px 0 28px;
  background: rgba(45, 58, 74, 0.03);
  border-top: 1px solid rgba(184, 228, 208, 0.1);
}

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

.footer-brand p {
  opacity: 0.6;
  font-size: 0.9rem;
  margin-top: 12px;
  line-height: 1.6;
}

.footer-col h4 {
  font-size: 0.9rem;
  font-weight: 700;
  margin-bottom: 16px;
  letter-spacing: 1px;
  text-transform: uppercase;
  opacity: 0.8;
}

.footer-col a {
  display: block;
  text-decoration: none;
  color: #2D3A4A;
  opacity: 0.6;
  font-size: 0.9rem;
  padding: 4px 0;
  transition: opacity 0.2s;
}

.footer-col a:hover {
  opacity: 1;
  color: #B8E4D0;
}

.footer-bottom {
  border-top: 1px solid rgba(45, 58, 74, 0.06);
  margin-top: 48px;
  padding-top: 24px;
  text-align: center;
  font-size: 0.85rem;
  opacity: 0.5;
}

/* ===== 工具类 ===== */
.text-accent {
  color: #B8E4D0;
}

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

.seo-description {
  max-width: 600px;
  margin: 0 auto 48px;
  opacity: 0.7;
  font-size: 1rem;
  line-height: 1.7;
}

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

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

/* ===== 响应式 ===== */
@media (max-width: 768px) {
  .feature-block {
    grid-template-columns: 1fr;
    gap: 40px;
  }

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

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

  .main-nav {
    display: none;
  }

  .menu-toggle {
    display: flex;
  }

  .main-nav.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 68px;
    left: 0;
    width: 100%;
    background: rgba(232, 240, 254, 0.98);
    backdrop-filter: blur(16px);
    padding: 24px 32px;
    gap: 16px;
    border-bottom: 1px solid rgba(45, 58, 74, 0.06);
    box-shadow: 0 8px 24px rgba(0,0,0,0.04);
  }

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

  .section-title {
    font-size: 1.8rem;
  }

  .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;
    gap: 24px;
  }

  .hero-buttons {
    flex-direction: column;
  }

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

  .section {
    padding: 60px 0;
  }

  .container {
    padding: 0 16px;
  }
}