/* ============================================================
   haijiao.com — 海角社区 · 链动全球
   设计理念：海洋潮汐 + 渐变玻璃 + 流动网格
   配色：珊瑚粉 #FF6B6B + 海洋蓝 #4ECDC4 + 沙白 #FFF8F0
   字体：系统无衬线 + 大胆字重对比
   ============================================================ */

/* 基础重置 */
*, *::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: #FFF8F0;  /* 沙白底 */
  color: #2D3436;
  line-height: 1.6;
}

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

.section {
  padding: 100px 0;
}

.section:nth-child(even) {
  background: linear-gradient(135deg, #FFF0E6 0%, #E8F8F5 100%);
}

/* 导航 — 固定顶部，半透明玻璃 */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: rgba(255, 248, 240, 0.92);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid rgba(78, 205, 196, 0.25);
  box-shadow: 0 4px 30px rgba(78, 205, 196, 0.08);
}

.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: 12px;
  font-weight: 800;
  font-size: 1.3rem;
  text-decoration: none;
  color: #FF6B6B;
  letter-spacing: -0.5px;
}

.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, #FF6B6B, #4ECDC4);
  color: #fff;
  box-shadow: 0 4px 12px rgba(255, 107, 107, 0.3);
}

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

.main-nav a {
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 600;
  color: #2D3436;
  position: relative;
  padding: 4px 0;
  transition: 0.3s ease;
}

.main-nav a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, #FF6B6B, #4ECDC4);
  transition: width 0.3s ease;
}

.main-nav a:hover {
  color: #FF6B6B;
}

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

.nav-cta {
  padding: 10px 24px !important;
  border-radius: 50px !important;
  background: linear-gradient(135deg, #FF6B6B, #FF8E8E);
  color: #fff !important;
  font-weight: 700 !important;
  box-shadow: 0 4px 16px rgba(255, 107, 107, 0.35);
  transition: 0.3s ease !important;
}

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

.nav-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(255, 107, 107, 0.5);
}

.menu-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: #FF6B6B;
}

/* 首页Hero — 潮汐波浪 */
.hero {
  min-height: 80vh;
  display: flex;
  align-items: center;
  position: relative;
  background: linear-gradient(165deg, #FFF8F0 0%, #E8F8F5 40%, #FFF0E6 100%);
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -20%;
  right: -10%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(78, 205, 196, 0.15), 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(255, 107, 107, 0.1), 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: 50px;
  margin-bottom: 20px;
  background: linear-gradient(135deg, rgba(255, 107, 107, 0.15), rgba(78, 205, 196, 0.15));
  color: #FF6B6B;
  letter-spacing: 2px;
  text-transform: uppercase;
}

.hero h1 {
  font-size: 3.2rem;
  line-height: 1.15;
  margin-bottom: 20px;
  font-weight: 800;
  color: #2D3436;
  letter-spacing: -1px;
}

.hero h1 span {
  background: linear-gradient(135deg, #FF6B6B, #4ECDC4);
  -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;
  color: #636e72;
}

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

.hero-image {
  border-radius: 20px;
  overflow: hidden;
  box-shadow: 0 20px 60px rgba(78, 205, 196, 0.15);
  position: relative;
  z-index: 2;
}

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

/* 按钮 — 珊瑚与海洋 */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 32px;
  border-radius: 50px;
  font-weight: 700;
  cursor: pointer;
  border: none;
  text-decoration: none;
  transition: all 0.3s ease;
  font-size: 0.95rem;
}

.btn-primary {
  background: linear-gradient(135deg, #FF6B6B, #FF8E8E);
  color: #fff;
  box-shadow: 0 4px 20px rgba(255, 107, 107, 0.35);
}

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 30px rgba(255, 107, 107, 0.5);
}

.btn-outline {
  background: transparent;
  border: 2px solid #4ECDC4;
  color: #4ECDC4;
}

.btn-outline:hover {
  background: rgba(78, 205, 196, 0.1);
  transform: translateY(-3px);
  box-shadow: 0 4px 16px rgba(78, 205, 196, 0.25);
}

/* 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;
  color: #FF6B6B;
  background: rgba(255, 107, 107, 0.1);
  padding: 4px 14px;
  border-radius: 50px;
}

.section-title {
  font-size: 2.2rem;
  margin-bottom: 16px;
  font-weight: 800;
  letter-spacing: -0.5px;
  color: #2D3436;
}

.section-desc {
  max-width: 600px;
  opacity: 0.7;
  margin-bottom: 48px;
  color: #636e72;
  font-size: 1.05rem;
}

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

.category-card {
  border-radius: 20px;
  padding: 32px;
  background: rgba(255, 255, 255, 0.7);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(78, 205, 196, 0.2);
  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;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, #FF6B6B, #4ECDC4);
  opacity: 0;
  transition: opacity 0.4s ease;
}

.category-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 12px 40px rgba(78, 205, 196, 0.15);
  border-color: rgba(255, 107, 107, 0.3);
}

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

.card-icon {
  width: 52px;
  height: 52px;
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  font-size: 1.5rem;
  background: linear-gradient(135deg, rgba(255, 107, 107, 0.12), rgba(78, 205, 196, 0.12));
  color: #FF6B6B;
}

.category-card h3 {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 10px;
}

.category-card p {
  font-size: 0.9rem;
  opacity: 0.65;
  margin-bottom: 16px;
  color: #636e72;
}

.card-link {
  font-weight: 700;
  font-size: 0.85rem;
  text-decoration: none;
  color: #4ECDC4;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: 0.3s ease;
}

.card-link:hover {
  color: #FF6B6B;
  gap: 10px;
}

/* 特性块 — 网格解构 */
.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(78, 205, 196, 0.12);
}

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

.feature-text h2 {
  font-size: 2rem;
  font-weight: 800;
  margin-bottom: 16px;
  letter-spacing: -0.5px;
}

.feature-text p {
  opacity: 0.7;
  margin-bottom: 24px;
  color: #636e72;
}

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

.feature-list li {
  padding: 8px 0;
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 500;
}

.feature-list li::before {
  content: '🌊';
  font-weight: 700;
  font-size: 1.1rem;
}

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

.stat-item {
  padding: 32px 20px;
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.6);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid rgba(78, 205, 196, 0.15);
  transition: 0.3s ease;
}

.stat-item:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 32px rgba(78, 205, 196, 0.12);
}

.stat-number {
  font-size: 2.6rem;
  font-weight: 900;
  background: linear-gradient(135deg, #FF6B6B, #4ECDC4);
  -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;
  font-weight: 500;
  color: #636e72;
}

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

.content-wall-item {
  border-radius: 20px;
  overflow: hidden;
  background: #fff;
  border: 1px solid rgba(78, 205, 196, 0.15);
  transition: all 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.content-wall-item:hover {
  transform: translateY(-6px);
  box-shadow: 0 12px 40px rgba(78, 205, 196, 0.12);
  border-color: rgba(255, 107, 107, 0.25);
}

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

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

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

.content-wall-body h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.content-wall-body p {
  font-size: 0.9rem;
  opacity: 0.65;
  color: #636e72;
}

/* FAQ — 折叠卡片 */
.faq-list {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  border: 1px solid rgba(78, 205, 196, 0.2);
  border-radius: 16px;
  margin-bottom: 12px;
  overflow: hidden;
  cursor: pointer;
  background: rgba(255, 255, 255, 0.5);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  transition: 0.3s ease;
}

.faq-item:hover {
  border-color: rgba(255, 107, 107, 0.3);
  box-shadow: 0 4px 20px rgba(78, 205, 196, 0.08);
}

.faq-item .faq-question {
  padding: 20px 24px;
  font-weight: 700;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 1rem;
  color: #2D3436;
}

.faq-item .faq-question::after {
  content: '+';
  font-size: 1.4rem;
  color: #4ECDC4;
  transition: 0.3s ease;
}

.faq-item.open .faq-question::after {
  content: '−';
  color: #FF6B6B;
}

.faq-item .faq-answer {
  padding: 0 24px 20px;
  display: none;
  opacity: 0.75;
  color: #636e72;
  line-height: 1.7;
}

.faq-item.open .faq-answer {
  display: block;
  animation: fadeInUp 0.4s ease;
}

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 0.75; transform: translateY(0); }
}

/* CTA横幅 — 渐变海洋 */
.cta-banner {
  padding: 64px 24px;
  text-align: center;
  border-radius: 24px;
  background: linear-gradient(135deg, #FF6B6B, #4ECDC4);
  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%;
  pointer-events: none;
}

.cta-banner h2 {
  color: #fff;
  font-size: 2rem;
  font-weight: 800;
  margin-bottom: 16px;
  position: relative;
  z-index: 2;
}

.cta-banner p {
  color: rgba(255,255,255,0.85);
  margin-bottom: 28px;
  max-width: 500px;
  margin-left: auto;
  margin-right: auto;
  position: relative;
  z-index: 2;
}

.cta-banner .btn-primary {
  background: #fff;
  color: #FF6B6B;
  box-shadow: 0 4px 20px rgba(0,0,0,0.1);
}

.cta-banner .btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 30px rgba(0,0,0,0.15);
}

/* 页脚 — 深色渐变 */
.site-footer {
  padding: 64px 0 32px;
  background: linear-gradient(180deg, #2D3436, #1a1e1f);
  color: rgba(255,255,255,0.8);
}

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

.footer-brand h3 {
  font-size: 1.3rem;
  font-weight: 800;
  color: #4ECDC4;
  margin-bottom: 12px;
}

.footer-brand p {
  opacity: 0.6;
  font-size: 0.9rem;
  line-height: 1.7;
}

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

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

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

.footer-col ul li a {
  color: rgba(255,255,255,0.6);
  text-decoration: none;
  font-size: 0.9rem;
  transition: 0.3s ease;
}

.footer-col ul li a:hover {
  color: #4ECDC4;
  padding-left: 4px;
}

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.08);
  margin-top: 48px;
  padding-top: 24px;
  text-align: center;
  font-size: 0.85rem;
  opacity: 0.5;
}

/* 工具类 */
.text-accent {
  color: #FF6B6B;
}

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

.seo-description {
  max-width: 600px;
  margin: 0 auto 48px;
  opacity: 0.7;
  color: #636e72;
}

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

/* 响应式 */
@media (max-width: 768px) {
  .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;
    gap: 32px;
  }

  .main-nav {
    display: none;
  }

  .menu-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
  }

  .main-nav.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 72px;
    left: 0;
    width: 100%;
    background: rgba(255, 248, 240, 0.98);
    backdrop-filter: blur(20px);
    padding: 24px;
    gap: 16px;
    border-bottom: 1px solid rgba(78, 205, 196, 0.2);
    box-shadow: 0 8px 30px rgba(0,0,0,0.05);
  }

  .section-title {
    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;
  }

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

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

  .cta-banner h2 {
    font-size: 1.5rem;
  }
}