/* ============================================================
   吃瓜网 · 免费吃瓜  —  设计系统
   风格：瓜瓤拼贴杂志风 / 奶油纸底 · 西瓜粉 × 瓜皮绿
   ============================================================ */

:root{
  --cream:#FFFBF4;
  --cream-2:#FFF3E6;
  --mint:#EEFAF2;
  --mint-2:#E3F7EA;
  --ink:#12332B;
  --ink-soft:#52756B;
  --pink:#FF4D6D;
  --pink-deep:#D81E4A;
  --pink-soft:#FFE4EB;
  --green:#12B76A;
  --green-soft:#DCF6E8;
  --sun:#FFB84D;
  --line:rgba(18,51,43,0.10);
  --line-strong:rgba(18,51,43,0.18);
  --r-xl:32px;
  --r-lg:24px;
  --r-md:18px;
  --r-sm:12px;
  --shadow-s:0 10px 24px -16px rgba(18,51,43,.30);
  --shadow-p:0 26px 48px -28px rgba(255,77,109,.65);
  --shadow-g:0 26px 48px -28px rgba(18,183,106,.55);
}

/* 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);
  background-image:
    radial-gradient(circle at 12% 8%, rgba(255,77,109,.10), transparent 42%),
    radial-gradient(circle at 88% 92%, rgba(18,183,106,.10), transparent 46%);
  background-attachment:fixed;
  color:var(--ink);
  line-height:1.7;
  font-size:16px;
  -webkit-font-smoothing:antialiased;
  letter-spacing:.01em;
}

/* 核心布局 — 必须居中 */
.container { max-width:1200px; margin:0 auto; padding:0 24px; }
.section { padding:80px 0; position:relative; }
.section:nth-child(even) {
  background:#F5FBF7;
  border-top:1px dashed var(--line-strong);
  border-bottom:1px dashed var(--line-strong);
}

/* 导航 — 固定顶部 */
.site-header {
  position:fixed; top:0; left:0; width:100%; z-index:1000;
  background:rgba(255,251,244,0.88);
  backdrop-filter:blur(14px) saturate(160%);
  -webkit-backdrop-filter:blur(14px) saturate(160%);
  border-bottom:1px solid var(--line);
}
.site-header::after{
  content:''; display:block; height:3px; width:100%;
  background:linear-gradient(90deg,var(--pink) 0%,var(--sun) 40%,var(--green) 100%);
  opacity:.85;
}
.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:10px;
  font-weight:800; font-size:1.18rem; letter-spacing:-.01em;
  text-decoration:none; color:inherit;
}
.logo-icon {
  width:38px; height:38px; border-radius:13px;
  display:flex; align-items:center; justify-content:center;
  font-size:.95rem; font-weight:900; color:#fff;
  background:conic-gradient(from 210deg, #FF4D6D, #FFB84D, #12B76A, #FF4D6D);
  box-shadow:0 10px 20px -12px rgba(255,77,109,.95);
  transition:transform .35s cubic-bezier(.34,1.56,.64,1);
}
.logo:hover .logo-icon{ transform:rotate(-12deg) scale(1.06); }

.main-nav { display:flex; align-items:center; gap:26px; list-style:none; }
.main-nav a {
  position:relative; text-decoration:none; font-size:.9rem; font-weight:600;
  transition:0.2s; color:var(--ink-soft);
}
.main-nav a:not(.nav-cta)::after{
  content:''; position:absolute; left:0; bottom:-5px; width:0; height:2px;
  border-radius:2px; background:var(--pink); transition:width .28s ease;
}
.main-nav a:not(.nav-cta):hover{ color:var(--ink); }
.main-nav a:not(.nav-cta):hover::after{ width:100%; }

.nav-cta {
  padding:9px 22px; border-radius:999px; color:#fff !important;
  font-weight:700;
  background:linear-gradient(120deg,var(--pink),#FF7B5A);
  box-shadow:0 12px 22px -14px rgba(255,77,109,1);
}
.nav-cta:hover{ transform:translateY(-2px); box-shadow:0 16px 26px -14px rgba(255,77,109,1); }

.menu-toggle {
  display:none; flex-direction:column; justify-content:center; gap:5px;
  width:42px; height:42px; border:1px solid var(--line);
  border-radius:12px; background:#fff; cursor:pointer;
}
.menu-toggle span{ display:block; width:18px; height:2px; margin:0 auto; background:var(--ink); border-radius:2px; }

/* 首页 Hero */
.hero {
  position:relative; min-height:72vh; display:flex; align-items:center;
  padding:150px 0 90px; overflow:hidden;
}
.hero::before{
  content:''; position:absolute; top:-140px; right:-120px;
  width:560px; height:560px; border-radius:50%;
  background:radial-gradient(circle at 32% 30%, #FFD5DE 0%, #FF4D6D 62%, rgba(255,77,109,0) 72%);
  opacity:.20; pointer-events:none;
}
.hero::after{
  content:''; position:absolute; bottom:-200px; left:-140px;
  width:520px; height:520px; border-radius:50%;
  background:radial-gradient(circle at 60% 40%, #C9F5DC 0%, #12B76A 60%, rgba(18,183,106,0) 72%);
  opacity:.18; pointer-events:none;
}
.hero-content { max-width:720px; position:relative; z-index:2; }
.hero-eyebrow {
  display:inline-block; font-size:.82rem; font-weight:700;
  padding:7px 18px; border-radius:999px; margin-bottom:22px;
  color:var(--pink-deep); background:var(--pink-soft);
  border:1px solid rgba(255,77,109,.28);
  letter-spacing:.04em;
}
.hero h1 {
  font-size:clamp(2.2rem, 5.4vw, 3.7rem);
  line-height:1.1; margin-bottom:22px;
  font-weight:900; letter-spacing:-.03em;
}
.hero h1 em{
  font-style:normal;
  background:linear-gradient(100deg,var(--pink) 10%,var(--sun) 55%,var(--green) 100%);
  -webkit-background-clip:text; background-clip:text; color:transparent;
}
.hero p {
  font-size:1.08rem; opacity:.72; max-width:560px; margin-bottom:34px;
  color:var(--ink-soft);
}
.hero-buttons { display:flex; gap:14px; flex-wrap:wrap; }
.hero-image {
  border-radius:var(--r-lg); overflow:hidden; position:relative;
  box-shadow:var(--shadow-p);
  border:1px solid var(--line);
  transform:rotate(-1.2deg);
}
.hero-image img { width:100%; height:auto; display:block; }

/* 按钮 */
.btn {
  display:inline-flex; align-items:center; justify-content:center; gap:8px;
  padding:13px 30px; border-radius:999px;
  font-weight:700; font-size:.95rem; cursor:pointer; border:none;
  text-decoration:none; transition:transform .25s cubic-bezier(.34,1.56,.64,1), box-shadow .25s, background .25s;
}
.btn-primary {
  color:#fff;
  background:linear-gradient(120deg,var(--pink) 0%, #FF7A5C 100%);
  box-shadow:0 16px 30px -18px rgba(255,77,109,1);
}
.btn-primary:hover{ transform:translateY(-3px); box-shadow:0 24px 38px -18px rgba(255,77,109,1); }
.btn-outline {
  background:transparent; border:1.5px solid var(--ink); color:var(--ink);
}
.btn-outline:hover{
  background:var(--ink); color:#fff; transform:translateY(-3px);
  box-shadow:var(--shadow-s);
}

/* 标签/标题 */
.section-label {
  display:inline-flex; align-items:center; gap:9px;
  font-size:.76rem; font-weight:800; letter-spacing:.22em;
  margin-bottom:14px; color:var(--green); text-transform:uppercase;
}
.section-label::before{
  content:''; width:24px; height:2px; border-radius:2px;
  background:linear-gradient(90deg,var(--pink),var(--green));
}
.section-title {
  font-size:clamp(1.6rem, 3.4vw, 2.35rem);
  margin-bottom:16px; font-weight:900; letter-spacing:-.025em; line-height:1.2;
}
.section-desc { max-width:600px; opacity:.72; margin-bottom:44px; color:var(--ink-soft); }

/* 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:30px 28px;
  border:1px solid var(--line); background:#fff;
  transition:transform .3s cubic-bezier(.34,1.4,.64,1), box-shadow .3s, border-color .3s;
  position:relative; overflow:hidden;
}
.category-card::before{
  content:''; position:absolute; inset:auto -30% -70% auto;
  width:170px; height:170px; border-radius:50%;
  background:radial-gradient(circle,var(--pink-soft),transparent 70%);
  opacity:.9; transition:.4s;
}
.category-card:hover {
  transform:translateY(-6px);
  box-shadow:var(--shadow-p);
  border-color:rgba(255,77,109,.32);
}
.category-card:hover::before{ transform:scale(1.25); }
.card-icon {
  width:50px; height:50px; border-radius:16px;
  display:flex; align-items:center; justify-content:center;
  margin-bottom:18px; font-size:1.35rem;
  background:var(--green-soft); color:var(--green);
  box-shadow:0 12px 22px -16px rgba(18,183,106,.9);
}
.category-card:nth-child(3n+2) .card-icon{ background:var(--pink-soft); color:var(--pink-deep); }
.category-card:nth-child(3n+3) .card-icon{ background:#FFF1D9; color:#C97A05; }
.card-link {
  font-weight:800; font-size:.85rem; text-decoration:none;
  color:var(--pink-deep); letter-spacing:.02em;
  display:inline-flex; align-items:center; gap:6px;
}
.card-link::after{ content:'→'; transition:transform .25s; }
.card-link:hover::after{ transform:translateX(4px); }

/* 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:1px solid var(--line);
  box-shadow:var(--shadow-g);
  transform:rotate(1deg);
}
.feature-image img { width:100%; height:auto; display:block; }
.feature-text { }
.feature-text h3{ font-size:1.55rem; font-weight:900; letter-spacing:-.02em; margin-bottom:12px; }
.feature-text p{ color:var(--ink-soft); opacity:.9; margin-bottom:22px; }
.feature-list { list-style:none; }
.feature-list li {
  padding:9px 0; display:flex; align-items:center; gap:11px;
  font-weight:600; font-size:.95rem;
  border-bottom:1px dashed var(--line);
}
.feature-list li:last-child{ border-bottom:none; }
.feature-list li::before {
  content:'✓'; font-weight:900; font-size:.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(--green),#3FD98E);
}

/* 数据条 */
.stats-bar { display:grid; grid-template-columns:repeat(4,1fr); gap:24px; text-align:center; }
.stat-item {
  padding:30px 20px; border-radius:var(--r-lg);
  border:1px solid var(--line); background:#fff;
  transition:transform .3s cubic-bezier(.34,1.4,.64,1), box-shadow .3s;
}
.stat-item:hover{ transform:translateY(-5px) rotate(-.6deg); box-shadow:var(--shadow-s); }
.stat-item:nth-child(1){ background:linear-gradient(180deg,#FFF3F6 0%, #FFFFFF 100%); }
.stat-item:nth-child(2){ background:linear-gradient(180deg,#EEFBF3 0%, #FFFFFF 100%); }
.stat-item:nth-child(3){ background:linear-gradient(180deg,#FFF8E9 0%, #FFFFFF 100%); }
.stat-item:nth-child(4){ background:linear-gradient(180deg,#F1F6FF 0%, #FFFFFF 100%); }
.stat-number {
  font-size:clamp(1.9rem, 3.6vw, 2.5rem); font-weight:900;
  letter-spacing:-.035em; line-height:1.15;
  background:linear-gradient(115deg,var(--pink) 0%, var(--sun) 50%, var(--green) 100%);
  -webkit-background-clip:text; background-clip:text; color:transparent;
}
.stat-label { font-size:.88rem; opacity:.68; margin-top:8px; color:var(--ink-soft); font-weight:600; }

/* 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;
  border:1px solid var(--line); background:#fff;
  transition:transform .3s cubic-bezier(.34,1.4,.64,1), box-shadow .3s;
}
.content-wall-item:nth-child(even){ transform:translateY(10px); }
.content-wall-item:hover {
  transform:translateY(-5px);
  box-shadow:var(--shadow-p);
}
.content-wall-item img {
  width:100%; height:200px; object-fit:cover; display:block;
  transition:transform .6s cubic-bezier(.2,.7,.3,1);
}
.content-wall-item:hover img{ transform:scale(1.07); }
.content-wall-body { padding:22px; }
.content-wall-body h3{ font-size:1.08rem; font-weight:800; letter-spacing:-.015em; margin-bottom:8px; }
.content-wall-body p{ font-size:.9rem; color:var(--ink-soft); opacity:.88; }

/* FAQ */
.faq-list { max-width:800px; margin:0 auto; }
.faq-item {
  border:1px solid var(--line); border-radius:var(--r-md);
  margin-bottom:10px; overflow:hidden; cursor:pointer;
  background:#fff; transition:border-color .3s, background .3s, box-shadow .3s;
}
.faq-item:hover{ border-color:rgba(18,183,106,.35); }
.faq-item.open{
  border-color:rgba(255,77,109,.35);
  background:linear-gradient(180deg,#FFF8FA,#FFFFFF);
  box-shadow:0 14px 30px -24px rgba(255,77,109,.9);
}
.faq-item .faq-question {
  padding:18px 22px; font-weight:800; font-size:1rem;
  display:flex; justify-content:space-between; align-items:center; gap:16px;
  letter-spacing:-.01em;
}
.faq-item.open .faq-question{ color:var(--pink-deep); }
.faq-item .faq-answer {
  padding:0 22px 18px; display:none; opacity:.75; font-size:.94rem;
  color:var(--ink-soft);
}
.faq-item.open .faq-answer { display:block; }

/* CTA横幅 */
.cta-banner {
  padding:64px 32px; text-align:center;
  border-radius:var(--r-xl); color:#fff;
  background:linear-gradient(120deg,var(--pink) 0%, #FF8A5B 52%, var(--sun) 100%);
  box-shadow:0 36px 70px -40px rgba(255,77,109,1);
  position:relative; overflow:hidden;
}
.cta-banner::before{
  content:''; position:absolute; top:-90px; left:-70px;
  width:280px; height:280px; border-radius:50%;
  background:rgba(255,255,255,.18);
}
.cta-banner::after{
  content:''; position:absolute; bottom:-110px; right:-60px;
  width:300px; height:300px; border-radius:50%;
  background:rgba(18,183,106,.28);
}
.cta-banner > *{ position:relative; z-index:2; }
.cta-banner h2 {
  color:#fff; font-size:clamp(1.6rem,3.4vw,2.3rem);
  font-weight:900; letter-spacing:-.025em; margin-bottom:14px;
}
.cta-banner p{ opacity:.92; max-width:520px; margin:0 auto 28px; }
.cta-banner .btn-primary {
  background:#fff; color:var(--pink-deep);
  box-shadow:0 18px 34px -20px rgba(0,0,0,.4);
}
.cta-banner .btn-primary:hover{ transform:translateY(-3px) scale(1.02); }

/* 页脚 */
.site-footer {
  padding:64px 0 28px;
  background:linear-gradient(180deg,var(--mint) 0%, var(--mint-2) 100%);
  border-top:1px dashed var(--line-strong);
  color:var(--ink);
}
.site-footer .container { }
.footer-grid { display:grid; grid-template-columns:2fr 1fr 1fr 1fr; gap:40px; }
.footer-brand { }
.footer-brand p{ font-size:.9rem; color:var(--ink-soft); opacity:.85; margin-top:14px; max-width:320px; }
.footer-col { }
.footer-col h4{
  font-size:.82rem; font-weight:800; letter-spacing:.16em;
  text-transform:uppercase; color:var(--pink-deep); 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:.9rem;
  transition:.2s; border-bottom:1px solid transparent;
}
.footer-col a:hover{ color:var(--green); border-bottom-color:var(--green); }
.footer-bottom {
  border-top:1px solid rgba(18,51,43,0.12);
  margin-top:44px; padding-top:22px; text-align:center; font-size:.85rem;
  color:var(--ink-soft); opacity:.8;
}

/* 工具类 */
.text-accent { color:var(--pink); font-weight:800; }
.text-center { text-align:center; }
.seo-description { max-width:600px; margin:0 auto 48px; opacity:.72; color:var(--ink-soft); }
.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; align-items:flex-start;
    position:absolute; top:71px; left:0; width:100%;
    background:#FFFBf4; padding:22px 24px 26px; gap:18px;
    border-bottom:1px solid var(--line);
    box-shadow:0 26px 40px -30px rgba(18,51,43,.6);
  }
  .main-nav.open .nav-cta{ width:100%; text-align:center; }
  .hero{ padding:126px 0 70px; }
  .content-wall-item:nth-child(even){ transform:none; }
  .hero::before, .hero::after{ opacity:.12; }
  .section{ padding:64px 0; }
}
@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; }
  .btn{ width:100%; }
  .hero-image{ transform:none; }
  .cta-banner{ padding:48px 22px; border-radius:24px; }
}