/* 吃瓜每日大赛 - 夏日西瓜美学设计系统 */
/* 独特视觉风格：西瓜红+薄荷绿+奶油白，圆润有机形态，气泡感 */

*, *::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: #f0f7f0; /* 薄荷奶油底 */
  color: #2d4a2d;
}

/* 核心布局 */
.container { max-width:1200px; margin:0 auto; padding:0 24px; }
.section { padding:80px 0; position:relative; }
.section:nth-child(even) { background: #fafff8; }

/* 导航 — 西瓜皮风格 */
.site-header { 
  position:fixed; top:0; left:0; width:100%; z-index:1000; 
  background: rgba(255,255,255,0.92); 
  backdrop-filter:blur(12px); 
  border-bottom: 2px solid #c8e6c9;
  box-shadow: 0 4px 20px rgba(46,125,50,0.08);
}
.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:10px; 
  font-weight:800; font-size:1.3rem; text-decoration:none; 
  color: #c62828; 
  letter-spacing: -0.5px;
}
.logo-icon { 
  width:40px; height:40px; 
  border-radius: 50%; 
  background: linear-gradient(135deg, #c62828, #e53935);
  display:flex; align-items:center; justify-content:center; 
  font-size:1.2rem; color:#fff;
  box-shadow: 0 2px 12px rgba(198,40,40,0.3);
}
.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: #33691e; 
  transition:0.2s; 
  position:relative;
  padding:4px 0;
}
.main-nav a::after {
  content:'';
  position:absolute; bottom:-2px; left:0; width:0; height:2px;
  background: #c62828;
  transition:0.3s;
  border-radius:2px;
}
.main-nav a:hover::after { width:100%; }
.main-nav a:hover { color:#c62828; }
.nav-cta { 
  padding:10px 24px; 
  border-radius: 50px; 
  background: linear-gradient(135deg, #c62828, #e53935);
  color:#fff!important; font-weight:700; 
  box-shadow: 0 4px 12px rgba(198,40,40,0.25);
  transition:0.3s;
}
.nav-cta:hover { transform:translateY(-2px); box-shadow: 0 6px 20px rgba(198,40,40,0.35); }
.nav-cta::after { display:none!important; }
.menu-toggle { display:none; }

/* 首页Hero — 西瓜切面灵感 */
.hero { 
  min-height:80vh; 
  display:flex; 
  align-items:center; 
  background: linear-gradient(135deg, #e8f5e9 0%, #f1f8e9 50%, #fff8e1 100%);
  position:relative;
  overflow:hidden;
}
.hero::before {
  content:'';
  position:absolute; top:-40%; right:-20%; width:600px; height:600px;
  background: radial-gradient(circle, rgba(198,40,40,0.08) 0%, transparent 70%);
  border-radius:50%;
  pointer-events:none;
}
.hero::after {
  content:'';
  position:absolute; bottom:-30%; left:-10%; width:400px; height:400px;
  background: radial-gradient(circle, rgba(46,125,50,0.06) 0%, 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:700; 
  padding:6px 18px; 
  border-radius: 50px; 
  background: rgba(198,40,40,0.12);
  color: #c62828;
  margin-bottom:16px; 
  letter-spacing:1px;
}
.hero h1 { 
  font-size:3.2rem; line-height:1.15; margin-bottom:20px; 
  color: #1b3a1b;
  letter-spacing: -1px;
}
.hero h1 span { color:#c62828; }
.hero p { 
  font-size:1.15rem; 
  opacity:0.75; 
  max-width:560px; 
  margin-bottom:36px; 
  color: #3e5a3e;
  line-height:1.6;
}
.hero-buttons { display:flex; gap:16px; }
.hero-image { 
  border-radius: 24px; 
  overflow:hidden; 
  box-shadow: 0 12px 40px rgba(46,125,50,0.12);
  border: 3px solid rgba(255,255,255,0.6);
}
.hero-image img { width:100%; height:auto; }

/* 按钮 — 圆润饱满 */
.btn { 
  display:inline-flex; align-items:center; gap:8px; 
  padding:14px 32px; 
  border-radius: 50px; 
  font-weight:700; 
  cursor:pointer; 
  border:none; 
  text-decoration:none; 
  transition:0.3s; 
  font-size:0.95rem;
}
.btn-primary { 
  background: linear-gradient(135deg, #c62828, #e53935);
  color:#fff; 
  box-shadow: 0 4px 16px rgba(198,40,40,0.3);
}
.btn-primary:hover { 
  transform:translateY(-3px); 
  box-shadow: 0 8px 24px rgba(198,40,40,0.4);
}
.btn-outline { 
  background:transparent; 
  border: 2px solid #c62828; 
  color: #c62828;
}
.btn-outline:hover { 
  background: rgba(198,40,40,0.06); 
  transform:translateY(-2px);
}

/* 标签/标题 — 清新 */
.section-label { 
  display:inline-block; 
  font-size:0.75rem; font-weight:700; 
  letter-spacing:3px; 
  margin-bottom:12px; 
  color: #558b2f;
  text-transform:uppercase;
}
.section-title { 
  font-size:2.2rem; margin-bottom:14px; 
  color: #1b3a1b;
  line-height:1.2;
}
.section-desc { max-width:600px; opacity:0.7; margin-bottom:40px; color:#3e5a3e; }

/* 卡片网格 — 西瓜籽点缀 */
.cards-grid { 
  display:grid; 
  grid-template-columns:repeat(auto-fill,minmax(270px,1fr)); 
  gap:28px; 
}
.category-card { 
  border-radius: 20px; 
  padding:32px; 
  background: #fff;
  border: 1px solid #c8e6c9;
  transition:0.3s; 
  position:relative;
  overflow:hidden;
}
.category-card::before {
  content:'';
  position:absolute; top:0; left:0; width:100%; height:4px;
  background: linear-gradient(90deg, #c62828, #e53935);
  opacity:0.6;
}
.category-card:hover { 
  transform:translateY(-5px); 
  box-shadow: 0 12px 32px rgba(46,125,50,0.12);
  border-color:#a5d6a7;
}
.card-icon { 
  width:52px; height:52px; 
  border-radius: 16px; 
  display:flex; align-items:center; justify-content:center; 
  margin-bottom:18px; font-size:1.5rem; 
  background: linear-gradient(135deg, #e8f5e9, #f1f8e9);
  color: #2e7d32;
}
.card-link { 
  font-weight:600; font-size:0.85rem; 
  text-decoration:none; 
  color: #c62828;
  display:inline-flex; align-items:center; gap:4px;
}
.card-link::after { content:'→'; transition:0.2s; }
.card-link:hover::after { transform:translateX(4px); }

/* 特性块 */
.feature-block { display:grid; grid-template-columns:1fr 1fr; gap:60px; align-items:center; }
.feature-image { 
  border-radius: 20px; 
  overflow:hidden; 
  box-shadow: 0 8px 30px rgba(46,125,50,0.1);
  border: 2px solid #c8e6c9;
}
.feature-image img { width:100%; height:auto; }
.feature-text { }
.feature-list { list-style:none; }
.feature-list li { 
  padding:8px 0; 
  display:flex; 
  align-items:center; 
  gap:10px; 
  font-weight:500;
  color: #2d4a2d;
}
.feature-list li::before { 
  content:'🍉'; 
  font-weight:700; 
  font-size:1.1rem;
}

/* 数据条 — 西瓜红渐变 */
.stats-bar { 
  display:grid; 
  grid-template-columns:repeat(4,1fr); 
  gap:24px; 
  text-align:center; 
}
.stat-item { 
  padding:28px 16px; 
  border-radius: 20px; 
  background: #fff;
  border: 1px solid #c8e6c9;
  transition:0.3s;
}
.stat-item:hover {
  transform:translateY(-3px);
  box-shadow: 0 8px 24px rgba(46,125,50,0.08);
}
.stat-number { 
  font-size:2.6rem; font-weight:900; 
  background: linear-gradient(135deg, #c62828, #e53935);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.stat-label { font-size:0.9rem; opacity:0.6; margin-top:6px; color:#3e5a3e; }

/* 内容墙 */
.content-wall { 
  display:grid; 
  grid-template-columns:repeat(auto-fill,minmax(290px,1fr)); 
  gap:28px; 
}
.content-wall-item { 
  border-radius: 20px; 
  overflow:hidden; 
  background: #fff;
  border: 1px solid #c8e6c9;
  transition:0.3s; 
}
.content-wall-item:hover { 
  transform:translateY(-5px); 
  box-shadow: 0 12px 32px rgba(46,125,50,0.1);
  border-color:#a5d6a7;
}
.content-wall-item img { 
  width:100%; height:210px; object-fit:cover; 
  border-bottom: 3px solid #c62828;
}
.content-wall-body { padding:22px; }
.content-wall-body h3 { color:#1b3a1b; margin-bottom:8px; }
.content-wall-body p { color:#3e5a3e; opacity:0.7; font-size:0.9rem; }

/* FAQ — 手风琴圆润 */
.faq-list { max-width:800px; margin:0 auto; }
.faq-item { 
  border: 1px solid #c8e6c9; 
  border-radius: 16px; 
  margin-bottom:10px; 
  overflow:hidden; 
  cursor:pointer; 
  background: #fff;
  transition:0.2s;
}
.faq-item:hover { border-color:#a5d6a7; }
.faq-item .faq-question { 
  padding:18px 22px; 
  font-weight:700; 
  display:flex; 
  justify-content:space-between; 
  align-items:center;
  color: #1b3a1b;
}
.faq-item .faq-question::after {
  content:'+';
  font-size:1.3rem;
  color:#c62828;
  transition:0.3s;
}
.faq-item.open .faq-question::after { content:'−'; transform:rotate(180deg); }
.faq-item .faq-answer { 
  padding:0 22px 18px; 
  display:none; 
  opacity:0.7; 
  color:#3e5a3e;
  line-height:1.6;
}
.faq-item.open .faq-answer { display:block; }

/* CTA横幅 — 西瓜红渐变 */
.cta-banner { 
  padding:64px 32px; 
  text-align:center; 
  border-radius: 24px; 
  background: linear-gradient(135deg, #c62828, #e53935, #ef5350);
  color:#fff; 
  box-shadow: 0 12px 40px rgba(198,40,40,0.25);
  position:relative;
  overflow:hidden;
}
.cta-banner::before {
  content:'🍉';
  position:absolute; top:-20px; right:10%; font-size:6rem; opacity:0.1;
  transform:rotate(15deg);
}
.cta-banner h2 { color:#fff; font-size:2rem; margin-bottom:12px; }
.cta-banner p { color:rgba(255,255,255,0.85); margin-bottom:24px; }
.cta-banner .btn-primary { 
  background: #fff; 
  color: #c62828; 
  box-shadow: 0 4px 16px rgba(0,0,0,0.1);
}
.cta-banner .btn-primary:hover { 
  transform:translateY(-3px); 
  box-shadow: 0 8px 24px rgba(0,0,0,0.15);
}

/* 页脚 */
.site-footer { 
  padding:60px 0 28px; 
  background: #1b3a1b; 
  color: rgba(255,255,255,0.8);
  border-top: 4px solid #c62828;
}
.site-footer .container { }
.footer-grid { 
  display:grid; 
  grid-template-columns:2fr 1fr 1fr 1fr; 
  gap:40px; 
}
.footer-brand { }
.footer-brand .logo { color:#fff; }
.footer-col { }
.footer-col h4 { color:#fff; margin-bottom:16px; font-size:1rem; }
.footer-col ul { list-style:none; }
.footer-col ul li { padding:4px 0; }
.footer-col ul li a { color:rgba(255,255,255,0.6); text-decoration:none; transition:0.2s; }
.footer-col ul li a:hover { color:#fff; }
.footer-bottom { 
  border-top: 1px solid rgba(255,255,255,0.1); 
  margin-top:40px; 
  padding-top:20px; 
  text-align:center; 
  font-size:0.85rem; 
  color:rgba(255,255,255,0.5);
}

/* 工具类 */
.text-accent { color:#c62828; }
.text-center { text-align:center; }
.seo-description { max-width:600px; margin:0 auto 48px; opacity:0.7; color:#3e5a3e; }
.mt-0 { margin-top:0; }
.mb-0 { margin-bottom:0; }

/* 响应式 */
@media (max-width: 768px) {
  .feature-block { grid-template-columns:1fr; }
  .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:#fff; padding:24px; border-bottom:2px solid #c8e6c9; gap:16px; }
  .hero h1 { font-size:2.2rem; }
  .section-title { font-size:1.7rem; }
}
@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; }
}