/* =========================================================
   吃瓜大赛 · 设计系统 v1.0
   风格：软糖贴纸 / 粗描边新拟态 / 奶油底色
   ========================================================= */

:root {
  --cream: #FFF7EC;
  --cream-2: #FDF1E0;
  --paper: #FFFFFF;
  --ink: #2A2440;
  --ink-soft: #6E6488;
  --melon: #FF5C7A;
  --mint: #16C79A;
  --sun: #FFC53D;
  --grape: #7C5CFF;
  --line: #2A2440;
  --shadow-hard: 6px 6px 0 var(--ink);
  --shadow-soft: 0 18px 40px -22px rgba(42, 36, 64, 0.55);
  --r-sm: 10px;
  --r-md: 16px;
  --r-lg: 24px;
  --r-pill: 999px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

/* 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-color: var(--cream);
  color: var(--ink);
  -webkit-font-smoothing: antialiased;
  line-height: 1.65;
  letter-spacing: 0.01em;
  background-image:
    radial-gradient(circle at 12% 8%, rgba(255, 92, 122, 0.14), transparent 42%),
    radial-gradient(circle at 88% 0%, rgba(124, 92, 255, 0.13), transparent 46%),
    radial-gradient(circle at 50% 100%, rgba(22, 199, 154, 0.12), transparent 55%);
  background-attachment: fixed;
}

::selection { background: var(--melon); color: #fff; }

html { scroll-behavior: smooth; }

img { max-width: 100%; display: block; }

/* 核心布局 — 必须居中 */
.container { max-width:1200px; margin:0 auto; padding:0 24px; }
.section { padding:80px 0; position: relative; scroll-margin-top: 84px; }
.section:nth-child(even) { background: rgba(255, 255, 255, 0.62); }

/* 导航 — 固定顶部 */
.site-header {
  position:fixed; top:0; left:0; width:100%; z-index:1000;
  background:rgba(255,247,236,0.82);
  backdrop-filter: blur(14px) saturate(1.4);
  -webkit-backdrop-filter: blur(14px) saturate(1.4);
  border-bottom:2px solid var(--ink);
}
.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:8px;
  font-weight:900; font-size:1.2rem; letter-spacing:-0.02em;
  text-decoration:none; color:var(--ink);
}
.logo-icon {
  width:36px; height:36px; border-radius:12px;
  display:flex; align-items:center; justify-content:center; font-size:1rem;
  background: linear-gradient(135deg, var(--melon) 0%, var(--sun) 100%);
  border: 2px solid var(--ink);
  box-shadow: 3px 3px 0 var(--ink);
}
.main-nav { display:flex; align-items:center; gap:6px; list-style:none; }
.main-nav a {
  text-decoration:none; font-size:0.9rem; font-weight:600;
  color: var(--ink); padding: 8px 14px; border-radius: var(--r-pill);
  transition: 0.25s var(--ease); position: relative;
}
.main-nav a:hover {
  background: var(--ink); color: var(--cream);
  transform: translateY(-1px);
}
.nav-cta {
  padding:8px 20px; border-radius: var(--r-pill);
  color:#fff !important; font-weight:800;
  background: linear-gradient(135deg, var(--grape), var(--melon));
  border: 2px solid var(--ink);
  box-shadow: 3px 3px 0 var(--ink);
  transition: 0.25s var(--ease);
}
.nav-cta:hover {
  transform: translate(-1px,-2px) !important;
  box-shadow: 5px 6px 0 var(--ink) !important;
  background: linear-gradient(135deg, var(--melan, #FF5C7A), var(--grape)) !important;
  color: #fff !important;
}
.menu-toggle {
  display:none; width:42px; height:42px; border-radius:12px;
  align-items:center; justify-content:center; cursor:pointer;
  background: var(--paper); border:2px solid var(--ink);
  box-shadow: 3px 3px 0 var(--ink); font-weight:900; color: var(--ink);
  font-size: 1.05rem;
}

/* 首页Hero */
.hero {
  min-height:70vh; display:flex; align-items:center;
  padding-top: 120px; padding-bottom: 64px;
  position: relative; overflow: hidden;
}
.hero::before {
  content: ''; position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(42,36,64,0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(42,36,64,0.045) 1px, transparent 1px);
  background-size: 46px 46px;
  mask-image: radial-gradient(ellipse at 50% 40%, #000 20%, transparent 78%);
  -webkit-mask-image: radial-gradient(ellipse at 50% 40%, #000 20%, transparent 78%);
  pointer-events: none;
}
.hero-content { max-width:720px; position: relative; z-index: 1; }
.hero-eyebrow {
  display:inline-block; font-size:0.85rem; font-weight:800;
  padding:6px 16px; border-radius: var(--r-pill); margin-bottom:22px;
  background: var(--sun); color: var(--ink);
  border: 2px solid var(--ink);
  box-shadow: 3px 3px 0 var(--ink);
  letter-spacing: 0.08em;
  transform: rotate(-2deg);
}
.hero h1 {
  font-size: clamp(2.2rem, 5.6vw, 4rem);
  font-weight: 900; line-height:1.1; margin-bottom:22px;
  letter-spacing: -0.035em;
  background: linear-gradient(100deg, var(--ink) 26%, var(--grape) 52%, var(--melon) 78%);
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent; color: transparent;
}
.hero p {
  font-size:1.1rem; color: var(--ink-soft);
  max-width:560px; margin-bottom:32px; font-weight: 500;
}
.hero-buttons { display:flex; gap:14px; flex-wrap: wrap; }
.hero-image {
  border-radius: var(--r-lg); overflow:hidden;
  border: 2px solid var(--ink);
  box-shadow: var(--shadow-hard);
  background: var(--paper);
}
.hero-image img { width:100%; height:auto; }

/* 按钮 */
.btn {
  display:inline-flex; align-items:center; gap:8px;
  padding:13px 30px; border-radius: var(--r-pill);
  font-weight:800; font-size: 0.95rem; cursor:pointer; border:none;
  text-decoration:none; transition: 0.25s var(--ease);
  letter-spacing: 0.01em; white-space: nowrap;
}
.btn-primary {
  color:#fff;
  background: linear-gradient(135deg, var(--melon) 0%, var(--grape) 100%);
  border: 2px solid var(--ink);
  box-shadow: var(--shadow-hard);
}
.btn-primary:hover {
  transform: translate(3px, 3px);
  box-shadow: 2px 2px 0 var(--ink);
}
.btn-outline {
  background: var(--paper); border: 2px solid var(--ink);
  color: var(--ink); box-shadow: var(--shadow-hard);
}
.btn-outline:hover {
  transform: translate(3px, 3px);
  box-shadow: 2px 2px 0 var(--ink);
  background: var(--mint); color: var(--ink);
}

/* 标签/标题 */
.section-label {
  display:inline-block; font-size:0.78rem; font-weight:900;
  letter-spacing:3px; margin-bottom:14px; text-transform: uppercase;
  color: var(--melon); position: relative; padding-left: 30px;
}
.section-label::before {
  content: ''; position: absolute; left: 0; top: 50%;
  width: 20px; height: 4px; border-radius: 4px;
  transform: translateY(-50%);
  background: linear-gradient(90deg, var(--mint), var(--grape));
}
.section-title {
  font-size: clamp(1.7rem, 3.4vw, 2.5rem);
  font-weight: 900; margin-bottom:14px;
  letter-spacing: -0.03em; line-height: 1.18; color: var(--ink);
}
.section-desc {
  max-width:600px; color: var(--ink-soft); margin-bottom:40px;
  font-weight: 500; font-size: 1.02rem;
}

/* 卡片网格 */
.cards-grid {
  display:grid; grid-template-columns:repeat(auto-fill, minmax(260px,1fr));
  gap:24px;
}
.category-card {
  border-radius: var(--r-lg); padding:28px;
  border: 2px solid var(--ink);
  background: var(--paper);
  box-shadow: 5px 5px 0 rgba(42,36,64,0.9);
  transition: 0.3s var(--ease);
  position: relative; overflow: hidden;
}
.category-card::after {
  content: ''; position: absolute; top: -40px; right: -40px;
  width: 110px; height: 110px; border-radius: 50%;
  background: radial-gradient(circle, rgba(255,197,61,0.35), transparent 70%);
  transition: 0.5s var(--ease);
}
.category-card:hover {
  transform: translate(-3px,-5px);
  box-shadow: 10px 12px 0 var(--ink);
}
.category-card:hover::after { transform: scale(1.5); }
.card-icon {
  width:48px; height:48px; border-radius:14px;
  display:flex; align-items:center; justify-content:center;
  margin-bottom:16px; font-size:1.3rem;
  border: 2px solid var(--ink);
  background: linear-gradient(135deg, var(--sun), var(--melon));
  box-shadow: 3px 3px 0 var(--ink);
}
.category-card h3 { font-size: 1.15rem; font-weight: 800; margin-bottom: 8px; letter-spacing: -0.01em; }
.category-card p { color: var(--ink-soft); font-size: 0.94rem; margin-bottom: 16px; }
.card-link {
  font-weight:800; font-size:0.85rem; text-decoration:none;
  color: var(--grape); display: inline-flex; align-items: center; gap: 6px;
  border-bottom: 2px solid transparent; transition: 0.25s var(--ease);
}
.card-link:hover { border-bottom-color: var(--grape); gap: 10px; }

/* 特性块 */
.feature-block {
  display:grid; grid-template-columns:1fr 1fr;
  gap:56px; align-items:center;
}
.feature-image {
  border-radius: var(--r-lg); overflow:hidden;
  border: 2px solid var(--ink);
  box-shadow: var(--shadow-hard);
  background: var(--paper);
}
.feature-image img { width:100%; height:auto; }
.feature-text { }
.feature-text h3 { font-size: 1.6rem; font-weight: 900; letter-spacing: -0.02em; margin-bottom: 14px; }
.feature-text > p { color: var(--ink-soft); margin-bottom: 22px; }
.feature-list { list-style:none; }
.feature-list li {
  padding:9px 0; display:flex; align-items:center; gap:12px;
  font-weight: 600; font-size: 0.98rem;
  border-bottom: 1.5px dashed rgba(42,36,64,0.16);
}
.feature-list li:last-child { border-bottom: none; }
.feature-list li::before {
  content:'✓'; font-weight:900; font-size: 0.72rem;
  width: 22px; height: 22px; flex: 0 0 22px;
  display: inline-flex; align-items: center; justify-content: center;
  border-radius: 50%; color: #fff;
  background: linear-gradient(135deg, var(--mint), var(--grape));
  border: 1.5px solid var(--ink);
}

/* 数据条 */
.stats-bar {
  display:grid; grid-template-columns:repeat(4,1fr);
  gap:24px; text-align:center;
}
.stat-item {
  padding:28px 20px; border-radius: var(--r-lg);
  border: 2px solid var(--ink); background: var(--paper);
  box-shadow: 5px 5px 0 rgba(42,36,64,0.9);
  transition: 0.3s var(--ease);
}
.stat-item:hover { transform: translateY(-5px); box-shadow: 8px 11px 0 var(--ink); }
.stat-number {
  font-size: clamp(1.9rem, 3.6vw, 2.6rem); font-weight:900;
  letter-spacing: -0.04em; line-height: 1;
  background: linear-gradient(135deg, var(--melon), var(--grape));
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent; color: transparent;
}
.stat-label { font-size:0.88rem; color: var(--ink-soft); margin-top:10px; font-weight: 600; letter-spacing: 0.04em; }

/* 内容墙 */
.content-wall {
  display:grid; grid-template-columns:repeat(auto-fill, minmax(280px,1fr));
  gap:24px;
}
.content-wall-item {
  border-radius: var(--r-lg); overflow:hidden; background: var(--paper);
  border: 2px solid var(--ink);
  box-shadow: 5px 5px 0 rgba(42,36,64,0.9);
  transition: 0.3s var(--ease);
}
.content-wall-item:hover {
  transform: translate(-3px,-5px);
  box-shadow: 10px 12px 0 var(--ink);
}
.content-wall-item img {
  width:100%; height:200px; object-fit:cover;
  border-bottom: 2px solid var(--ink);
  filter: saturate(1.08);
}
.content-wall-body { padding:20px; }
.content-wall-body h4 { font-size: 1.05rem; font-weight: 800; margin-bottom: 8px; letter-spacing: -0.01em; }
.content-wall-body p { color: var(--ink-soft); font-size: 0.92rem; }

/* FAQ */
.faq-list { max-width:800px; margin:0 auto; }
.faq-item {
  border: 2px solid var(--ink); border-radius: var(--r-md);
  margin-bottom:12px; overflow:hidden; cursor:pointer;
  background: var(--paper);
  box-shadow: 4px 4px 0 rgba(42,36,64,0.85);
  transition: 0.28s var(--ease);
}
.faq-item:hover { transform: translate(-2px,-2px); box-shadow: 7px 7px 0 var(--ink); }
.faq-item .faq-question {
  padding:18px 22px; font-weight:800; font-size: 1rem;
  display:flex; justify-content:space-between; align-items: center; gap: 16px;
  transition: 0.25s var(--ease);
}
.faq-item .faq-answer {
  padding:0 22px 18px; display:none; color: var(--ink-soft);
  font-size: 0.95rem; line-height: 1.75;
}
.faq-item.open {
  background: linear-gradient(135deg, rgba(255,197,61,0.16), rgba(22,199,154,0.14));
}
.faq-item.open .faq-question { color: var(--grape); }
.faq-item.open .faq-answer { display:block; animation: fadeSlide 0.35s var(--ease); }

@keyframes fadeSlide {
  from { opacity: 0; transform: translateY(-6px); }
  to { opacity: 1; transform: translateY(0); }
}

/* CTA横幅 */
.cta-banner {
  padding:64px 32px; text-align:center; border-radius: var(--r-lg);
  color:#fff; position: relative; overflow: hidden;
  border: 2px solid var(--ink);
  box-shadow: var(--shadow-hard);
  background: linear-gradient(125deg, var(--grape) 0%, var(--melon) 55%, var(--sun) 130%);
}
.cta-banner::before {
  content: ''; position: absolute; inset: 0;
  background-image: radial-gradient(rgba(255,255,255,0.22) 1.5px, transparent 1.5px);
  background-size: 22px 22px;
  opacity: 0.7; pointer-events: none;
}
.cta-banner h2 {
  color:#fff; font-size: clamp(1.6rem, 3.4vw, 2.4rem);
  font-weight: 900; letter-spacing: -0.03em; margin-bottom: 14px;
  position: relative; z-index: 1;
}
.cta-banner p { position: relative; z-index: 1; opacity: 0.95; margin-bottom: 26px; max-width: 560px; margin-left: auto; margin-right: auto; }
.cta-banner .btn-primary {
  background:#fff; color: var(--ink);
  border: 2px solid var(--ink);
  box-shadow: 5px 5px 0 rgba(42,36,64,0.85);
  position: relative; z-index: 1;
}
.cta-banner .btn-primary:hover {
  transform: translate(3px,3px); box-shadow: 2px 2px 0 rgba(42,36,64,0.85);
  background: var(--sun);
}

/* 页脚 */
.site-footer {
  padding:56px 0 28px;
  background: rgba(255, 255, 255, 0.72);
  border-top: 2px solid var(--ink);
}
.site-footer .container { }
.footer-grid { display:grid; grid-template-columns:2fr 1fr 1fr 1fr; gap:40px; }
.footer-brand { }
.footer-brand .logo { margin-bottom: 14px; }
.footer-brand p { color: var(--ink-soft); font-size: 0.92rem; max-width: 300px; }
.footer-col { }
.footer-col h4 {
  font-size: 0.82rem; font-weight: 900; letter-spacing: 2px;
  text-transform: uppercase; color: var(--ink); margin-bottom: 16px;
}
.footer-col ul { list-style: none; }
.footer-col li { margin-bottom: 9px; }
.footer-col a {
  text-decoration: none; color: var(--ink-soft);
  font-size: 0.9rem; font-weight: 500; transition: 0.22s var(--ease);
  display: inline-block;
}
.footer-col a:hover { color: var(--melon); transform: translateX(4px); }
.footer-bottom {
  border-top: 1.5px dashed rgba(42,36,64,0.2);
  margin-top:40px; padding-top:20px; text-align:center;
  font-size:0.85rem; color: var(--ink-soft); font-weight: 500;
}

/* 工具类 */
.text-accent { color: var(--melon); font-weight: 800; }
.text-center { text-align:center; }
.text-center .section-label { padding-left: 30px; }
.seo-description {
  max-width:600px; margin:0 auto 48px;
  color: var(--ink-soft); font-weight: 500;
}
.mt-0 { margin-top:0; }
.mb-0 { margin-bottom:0; }

/* 滚动条 */
::-webkit-scrollbar { width: 12px; }
::-webkit-scrollbar-track { background: var(--cream-2); }
::-webkit-scrollbar-thumb {
  background: linear-gradient(180deg, var(--melon), var(--grape));
  border: 3px solid var(--cream-2); border-radius: 999px;
}

/* ⚠️ 响应式 */
@media (max-width: 1024px) {
  .footer-grid { grid-template-columns: 1.6fr 1fr 1fr; }
}

@media (max-width: 768px) {
  .feature-block { grid-template-columns:1fr; gap: 36px; }
  .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; align-items: stretch;
    position:absolute; top:70px; left:0; width:100%;
    background: var(--cream);
    padding:20px; gap: 6px;
    border-bottom: 2px solid var(--ink);
    box-shadow: 0 18px 30px -20px rgba(42,36,64,0.6);
  }
  .main-nav.open a { border-radius: var(--r-md); padding: 12px 16px; }
  .section { padding: 64px 0; }
  .hero { padding-top: 108px; }
  .cta-banner { padding: 48px 22px; }
}

@media (max-width: 480px) {
  .cards-grid, .content-wall, .stats-bar { grid-template-columns:1fr; }
  .footer-grid { grid-template-columns:1fr; gap: 28px; }
  .hero-buttons { flex-direction:column; align-items: stretch; }
  .hero-buttons .btn { justify-content: center; }
  .btn { padding: 13px 24px; }
  .hero-eyebrow { transform: rotate(-1.5deg); font-size: 0.78rem; }
}