/* ==========================================================================
   黑料吃瓜 · 设计系统 v1
   风格：清新编辑部 / 硬边阴影 / 西瓜配色（奶白底 + 墨绿线 + 蜜瓜红）
   ========================================================================== */

/* ---------- 设计令牌 ---------- */
:root {
  --paper:        #FFFBF2;
  --paper-alt:    #EFFAF3;
  --paper-card:   #FFFFFF;
  --ink:          #12352B;
  --ink-soft:     #3F6156;
  --ink-faint:    #8AA79C;
  --melon:        #FF4D6D;
  --melon-deep:   #E22F51;
  --rind:         #12B76A;
  --seed:         #FFC93C;
  --line:         #12352B;
  --shadow-sm:    4px 4px 0 var(--ink);
  --shadow-md:    6px 6px 0 var(--ink);
  --shadow-lg:    10px 10px 0 var(--ink);
  --radius:       18px;
  --radius-quirk: 22px 22px 22px 6px;
  --ease:         cubic-bezier(.22,.9,.3,1.2);
}

/* ---------- 基础重置 ---------- */
*, *::before, *::after { margin:0; padding:0; box-sizing:border-box; }

html { scroll-behavior:smooth; -webkit-text-size-adjust:100%; }

body {
  font-family: system-ui, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  overflow-x:hidden;
  color: var(--ink);
  line-height: 1.7;
  background-color: var(--paper);
  background-image:
    radial-gradient(circle at 12% 8%, rgba(255,77,109,.10), transparent 42%),
    radial-gradient(circle at 88% 4%, rgba(18,183,106,.12), transparent 40%),
    radial-gradient(circle at 50% 120%, rgba(255,201,60,.14), transparent 55%),
    radial-gradient(rgba(18,53,43,.10) 1px, transparent 1px);
  background-size: auto, auto, auto, 22px 22px;
  background-attachment: fixed;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

::selection { background: var(--seed); color: var(--ink); }

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

:focus-visible {
  outline: 3px dashed var(--melon);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ---------- 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: var(--paper-alt);
  border-top: 1px solid rgba(18,53,43,.08);
  border-bottom: 1px solid rgba(18,53,43,.08);
}

/* ---------- 导航 ---------- */
.site-header {
  position:fixed; top:0; left:0; width:100%; z-index:1000;
  background: rgba(255,251,242,0.86);
  backdrop-filter: blur(14px) saturate(150%);
  -webkit-backdrop-filter: blur(14px) saturate(150%);
  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:10px;
  font-weight:900; font-size:1.2rem; letter-spacing:-.02em;
  text-decoration:none; color:var(--ink);
}

.logo-icon {
  width:36px; height:36px; border-radius:50% 50% 50% 8px;
  display:flex; align-items:center; justify-content:center;
  font-size:1rem;
  background: linear-gradient(140deg, var(--melon) 0%, var(--melon) 48%, var(--rind) 52%, var(--rind) 100%);
  border: 2px solid var(--ink);
  box-shadow: 2px 2px 0 var(--ink);
  color:#fff;
  transform: rotate(-6deg);
  transition: transform .35s var(--ease);
}
.logo:hover .logo-icon { transform: rotate(6deg) scale(1.06); }

.main-nav { display:flex; align-items:center; gap:26px; list-style:none; }

.main-nav a {
  text-decoration:none; font-size:.9rem; font-weight:600;
  color: var(--ink); position:relative; padding:4px 0;
  transition: color .2s;
}
.main-nav a::after {
  content:''; position:absolute; left:0; bottom:0;
  width:0; height:3px; border-radius:2px;
  background: var(--melon);
  transition: width .28s var(--ease);
}
.main-nav a:hover { color: var(--melon-deep); }
.main-nav a:hover::after { width:100%; }

.nav-cta {
  padding:9px 20px !important;
  border-radius: 999px !important;
  color: var(--ink) !important;
  font-weight:800 !important;
  background: var(--seed);
  border: 2px solid var(--ink);
  box-shadow: 3px 3px 0 var(--ink);
  transition: transform .16s var(--ease), box-shadow .16s var(--ease), background .2s !important;
}
.nav-cta::after { display:none !important; }
.nav-cta:hover {
  background: var(--melon) !important;
  transform: translate(-2px,-2px);
  box-shadow: 5px 5px 0 var(--ink);
}

.menu-toggle {
  display:none;
  width:42px; height:42px; align-items:center; justify-content:center;
  background: var(--paper-card);
  border: 2px solid var(--ink);
  border-radius: 12px;
  box-shadow: 3px 3px 0 var(--ink);
  font-size:1.1rem; color: var(--ink);
  cursor:pointer;
}

/* ---------- 首页 Hero ---------- */
.hero {
  min-height:70vh;
  display:flex; align-items:center;
  padding: 150px 0 90px;
  position: relative;
  overflow: hidden;
}

.hero::before,
.hero::after {
  content:''; position:absolute; border-radius:50%; z-index:0;
  filter: blur(2px);
  pointer-events:none;
}
.hero::before {
  width: 440px; height:440px; right:-140px; top:60px;
  background: radial-gradient(circle at 35% 35%, rgba(255,77,109,.30), rgba(255,201,60,.14) 60%, transparent 72%);
}
.hero::after {
  width: 300px; height:300px; left:-120px; bottom:-60px;
  background: radial-gradient(circle at 50% 50%, rgba(18,183,106,.26), transparent 70%);
}

.hero-content { max-width:760px; position:relative; z-index:1; }

.hero-eyebrow {
  display:inline-block;
  font-size:.82rem; font-weight:800; letter-spacing:.16em;
  padding:6px 16px;
  border-radius: 999px;
  margin-bottom:22px;
  color: var(--ink);
  background: rgba(18,183,106,.14);
  border: 2px dashed var(--rind);
  text-transform: uppercase;
}

.hero h1 {
  font-size: clamp(2.2rem, 6vw, 4.1rem);
  line-height:1.08;
  margin-bottom:22px;
  font-weight:900;
  letter-spacing:-.035em;
  color: var(--ink);
  text-wrap: balance;
}
.hero h1 em,
.hero h1 .text-accent {
  font-style: normal;
  color: var(--melon);
  background: linear-gradient(transparent 62%, rgba(255,201,60,.75) 62%);
  padding: 0 .06em;
}

.hero p {
  font-size:1.1rem;
  color: var(--ink-soft);
  max-width:580px;
  margin-bottom:34px;
}

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

.hero-image {
  border-radius: var(--radius-quirk);
  overflow:hidden;
  border: 2px solid var(--ink);
  box-shadow: var(--shadow-md);
  background: var(--paper-card);
}
.hero-image img { width:100%; height:auto; }

/* ---------- 按钮 ---------- */
.btn {
  display:inline-flex; align-items:center; justify-content:center; gap:8px;
  padding:13px 30px;
  border-radius: 999px;
  font-weight:800; font-size:.95rem; letter-spacing:.01em;
  cursor:pointer; border:2px solid var(--ink);
  text-decoration:none;
  transition: transform .18s var(--ease), box-shadow .18s var(--ease), background .2s;
  box-shadow: var(--shadow-sm);
}
.btn:active { transform: translate(3px,3px); box-shadow: 1px 1px 0 var(--ink); }

.btn-primary {
  color: #fff;
  background: linear-gradient(120deg, var(--melon) 0%, var(--melon-deep) 100%);
}
.btn-primary:hover {
  background: linear-gradient(120deg, var(--melon-deep), var(--melon));
  transform: translate(-2px,-2px);
  box-shadow: 7px 7px 0 var(--ink);
}

.btn-outline {
  background: var(--paper-card);
  border:2px solid var(--ink);
  color: var(--ink);
}
.btn-outline:hover {
  background: var(--seed);
  transform: translate(-2px,-2px);
  box-shadow: 7px 7px 0 var(--ink);
}

/* ---------- 标签 / 标题 ---------- */
.section-label {
  display:inline-block;
  font-size:.78rem; font-weight:900; letter-spacing:.24em;
  margin-bottom:14px;
  color: var(--melon-deep);
  text-transform: uppercase;
  padding-left: 30px;
  position: relative;
}
.section-label::before {
  content:''; position:absolute; left:0; top:50%;
  width:20px; height:3px; border-radius:2px;
  background: var(--rind);
  transform: translateY(-50%);
}

.section-title {
  font-size: clamp(1.7rem, 3.6vw, 2.6rem);
  margin-bottom:16px;
  font-weight:900;
  letter-spacing:-.03em;
  line-height:1.18;
  color: var(--ink);
}

.section-desc {
  max-width:620px;
  color: var(--ink-soft);
  margin-bottom:44px;
  font-size:1.02rem;
}

.section-title.text-center + .section-desc,
.section-desc.text-center { margin-left:auto; margin-right:auto; }

/* ---------- 卡片网格 ---------- */
.cards-grid {
  display:grid;
  grid-template-columns:repeat(auto-fill, minmax(260px,1fr));
  gap:26px;
}

.category-card {
  border-radius: var(--radius-quirk);
  padding:30px 28px 26px;
  border:2px solid var(--ink);
  background: var(--paper-card);
  box-shadow: var(--shadow-sm);
  transition: transform .22s var(--ease), box-shadow .22s var(--ease), background .25s;
  position: relative;
}
.category-card:nth-child(3n+2) { background: #FFF7E3; }
.category-card:nth-child(3n+3) { background: #EFFAF3; }

.category-card:hover {
  transform: translate(-4px,-4px);
  box-shadow: var(--shadow-lg);
}

.card-icon {
  width:52px; height:52px;
  border-radius: 16px 16px 16px 4px;
  display:flex; align-items:center; justify-content:center;
  margin-bottom:18px; font-size:1.35rem;
  background: linear-gradient(140deg, var(--seed), #FFB020);
  border:2px solid var(--ink);
  box-shadow: 2px 2px 0 var(--ink);
}
.category-card:nth-child(3n+2) .card-icon { background: linear-gradient(140deg, var(--melon), #FF8FA3); }
.category-card:nth-child(3n+3) .card-icon { background: linear-gradient(140deg, var(--rind), #6FE0A5); }

.category-card h3 {
  font-size:1.14rem; font-weight:900; letter-spacing:-.02em;
  margin-bottom:8px;
}
.category-card p { font-size:.92rem; color: var(--ink-soft); margin-bottom:16px; }

.card-link {
  font-weight:800; font-size:.85rem;
  text-decoration:none; color: var(--melon-deep);
  display:inline-flex; align-items:center; gap:6px;
  border-bottom: 2px solid transparent;
  transition: gap .2s var(--ease), border-color .2s;
}
.card-link::after { content:'→'; }
.card-link:hover { gap:11px; border-color: var(--melon); }

/* ---------- 特性块 ---------- */
.feature-block {
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:56px;
  align-items:center;
}

.feature-image {
  border-radius: var(--radius-quirk);
  overflow:hidden;
  border:2px solid var(--ink);
  box-shadow: var(--shadow-md);
  background: var(--paper-card);
  transform: rotate(-1.2deg);
  transition: transform .3s var(--ease);
}
.feature-image:hover { transform: rotate(0deg) scale(1.01); }
.feature-image img { width:100%; height:auto; }

.feature-text h2,
.feature-text h3 {
  font-size: clamp(1.5rem, 3vw, 2.1rem);
  font-weight:900; letter-spacing:-.03em;
  line-height:1.2; margin-bottom:16px;
}
.feature-text p { color: var(--ink-soft); margin-bottom:22px; }

.feature-list { list-style:none; }
.feature-list li {
  padding:8px 0;
  display:flex; align-items:flex-start; gap:12px;
  font-size:.96rem;
  border-bottom: 1px dashed rgba(18,53,43,.16);
}
.feature-list li:last-child { border-bottom:none; }
.feature-list li::before {
  content:'✓';
  font-weight:900;
  font-size:.72rem;
  line-height:1;
  flex:0 0 auto;
  width:22px; height:22px; margin-top:3px;
  display:inline-flex; align-items:center; justify-content:center;
  border-radius:50%;
  background: var(--rind);
  color:#fff;
  border:2px solid var(--ink);
}

/* ---------- 数据条 ---------- */
.stats-bar {
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:24px;
  text-align:center;
}

.stat-item {
  padding:30px 18px;
  border-radius: var(--radius-quirk);
  border:2px solid var(--ink);
  background: var(--paper-card);
  box-shadow: var(--shadow-sm);
  transition: transform .22s var(--ease), box-shadow .22s var(--ease);
}
.stat-item:nth-child(odd) { background:#FFF7E3; }
.stat-item:hover { transform: translate(-3px,-3px); box-shadow: var(--shadow-lg); }

.stat-number {
  font-size: clamp(1.9rem, 4vw, 2.6rem);
  font-weight:900;
  letter-spacing:-.04em;
  line-height:1;
  color: var(--melon-deep);
  font-variant-numeric: tabular-nums;
}
.stat-item:nth-child(even) .stat-number { color: var(--rind); }

.stat-label {
  font-size:.86rem; font-weight:600;
  color: var(--ink-soft);
  margin-top:10px;
  letter-spacing:.02em;
}

/* ---------- 内容墙 ---------- */
.content-wall {
  display:grid;
  grid-template-columns:repeat(auto-fill, minmax(280px,1fr));
  gap:26px;
}

.content-wall-item {
  border-radius: var(--radius-quirk);
  overflow:hidden;
  border:2px solid var(--ink);
  background: var(--paper-card);
  box-shadow: var(--shadow-sm);
  transition: transform .22s var(--ease), box-shadow .22s var(--ease);
  display:flex; flex-direction:column;
}
.content-wall-item:hover {
  transform: translate(-4px,-4px);
  box-shadow: var(--shadow-lg);
}

.content-wall-item img {
  width:100%; height:200px; object-fit:cover;
  border-bottom:2px solid var(--ink);
  filter: saturate(112%);
  transition: transform .5s var(--ease);
}
.content-wall-item:hover img { transform: scale(1.04); }

.content-wall-body { padding:22px; flex:1; display:flex; flex-direction:column; gap:8px; }
.content-wall-body h4 { font-size:1.05rem; font-weight:900; letter-spacing:-.02em; line-height:1.35; }
.content-wall-body p { font-size:.9rem; color: var(--ink-soft); }
.content-wall-body .card-link { margin-top:auto; }

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

.faq-item {
  border:2px solid var(--ink);
  border-radius: 14px;
  margin-bottom:12px;
  overflow:hidden;
  cursor:pointer;
  background: var(--paper-card);
  box-shadow: var(--shadow-sm);
  transition: transform .18s var(--ease), box-shadow .18s var(--ease), background .2s;
}
.faq-item:hover { transform: translate(-2px,-2px); box-shadow: var(--shadow-md); }
.faq-item.open { background:#FFF7E3; }

.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 .faq-question::after {
  content:'+';
  flex:0 0 auto;
  width:28px; height:28px;
  display:inline-flex; align-items:center; justify-content:center;
  border-radius:50%;
  background: var(--seed);
  border:2px solid var(--ink);
  font-weight:900; font-size:1.05rem; line-height:1;
  transition: transform .3s var(--ease), background .25s;
}
.faq-item.open .faq-question::after {
  content:'–';
  transform: rotate(180deg);
  background: var(--melon);
  color:#fff;
}

.faq-item .faq-answer {
  padding:0 22px 18px;
  display:none;
  color: var(--ink-soft);
  font-size:.95rem;
  border-top: 1px dashed rgba(18,53,43,.22);
  padding-top:14px;
  margin:0 22px 18px;
  padding-left:0; padding-right:0;
}
.faq-item.open .faq-answer { display:block; animation: faqIn .3s ease both; }

@keyframes faqIn {
  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(--radius-quirk);
  color:#fff;
  border:2px solid var(--ink);
  box-shadow: var(--shadow-lg);
  position: relative;
  overflow:hidden;
  background:
    radial-gradient(circle at 15% 20%, rgba(255,255,255,.28), transparent 42%),
    radial-gradient(circle at 85% 90%, rgba(18,183,106,.55), transparent 46%),
    linear-gradient(125deg, var(--melon) 0%, #FF7A45 58%, var(--seed) 130%);
}
.cta-banner::after {
  content:'';
  position:absolute; inset:0;
  background-image: radial-gradient(rgba(255,255,255,.35) 1.5px, transparent 1.5px);
  background-size: 18px 18px;
  opacity:.55;
  pointer-events:none;
}
.cta-banner > * { position:relative; z-index:1; }

.cta-banner h2 {
  color:#fff;
  font-size: clamp(1.6rem, 3.4vw, 2.4rem);
  font-weight:900; letter-spacing:-.03em;
  line-height:1.2;
  margin-bottom:14px;
  text-shadow: 2px 2px 0 rgba(18,53,43,.18);
}
.cta-banner p { color: rgba(255,255,255,.92); max-width:520px; margin:0 auto 28px; }

.cta-banner .btn-primary {
  background:#fff;
  color: var(--ink);
  border:2px solid var(--ink);
}
.cta-banner .btn-primary:hover { background: var(--seed); }

/* ---------- 页脚 ---------- */
.site-footer {
  padding:64px 0 28px;
  background: var(--paper-alt);
  border-top:2px solid var(--ink);
  position: relative;
}
.site-footer .container { position:relative; z-index:1; }

.footer-grid {
  display:grid;
  grid-template-columns:2fr 1fr 1fr 1fr;
  gap:44px;
}

.footer-brand .logo { margin-bottom:16px; }
.footer-brand p { font-size:.92rem; color: var(--ink-soft); max-width:340px; }

.footer-col h4 {
  font-size:.8rem; font-weight:900; letter-spacing:.18em;
  text-transform: uppercase;
  color: var(--melon-deep);
  margin-bottom:16px;
}
.footer-col ul { list-style:none; }
.footer-col li { margin-bottom:10px; }
.footer-col a {
  text-decoration:none;
  font-size:.92rem;
  color: var(--ink-soft);
  transition: color .2s, padding-left .2s var(--ease);
  display:inline-block;
}
.footer-col a:hover { color: var(--ink); padding-left:5px; }

.footer-bottom {
  border-top: 1px dashed rgba(18,53,43,.28);
  margin-top:44px;
  padding-top:22px;
  text-align:center;
  font-size:.85rem;
  color: var(--ink-faint);
}

/* ---------- 工具类 ---------- */
.text-accent { color: var(--melon-deep); }
.text-center { text-align:center; }
.seo-description {
  max-width:620px;
  margin:0 auto 48px;
  color: var(--ink-soft);
}
.mt-0 { margin-top:0; }
.mb-0 { margin-bottom:0; }

/* ---------- 响应式 ---------- */
@media (max-width: 992px) {
  .footer-grid { grid-template-columns: 1.6fr 1fr 1fr; gap:36px; }
  .footer-grid .footer-col:last-child { grid-column: span 3; }
}

@media (max-width: 768px) {
  .section { padding:60px 0; }
  .feature-block { grid-template-columns:1fr; gap:36px; }
  .stats-bar { grid-template-columns:repeat(2,1fr); }
  .footer-grid { grid-template-columns:1fr 1fr; }
  .footer-brand { grid-column: span 2; }

  .hero { padding: 128px 0 72px; min-height:auto; }

  .main-nav { display:none; }
  .menu-toggle { display:flex; }

  .main-nav.open {
    display:flex;
    flex-direction:column;
    align-items:flex-start;
    gap:6px;
    position:fixed;
    top:70px; left:0; width:100%;
    background: var(--paper);
    padding:22px 24px 30px;
    border-bottom:2px solid var(--ink);
    box-shadow: 0 10px 0 rgba(18,53,43,.08);
    animation: navIn .28s var(--ease) both;
  }
  .main-nav.open li { width:100%; }
  .main-nav.open a {
    display:block;
    width:100%;
    padding:12px 4px;
    font-size:1.05rem;
    border-bottom:1px dashed rgba(18,53,43,.18);
  }
  .main-nav.open a::after { display:none; }
  .main-nav.open .nav-cta {
    margin-top:14px;
    text-align:center;
    border-bottom:2px solid var(--ink) !important;
    color: var(--ink) !important;
  }
}

@keyframes navIn {
  from { opacity:0; transform: translateY(-10px); }
  to   { opacity:1; transform: translateY(0); }
}

@media (max-width: 480px) {
  .cards-grid, .content-wall, .stats-bar { grid-template-columns:1fr; }
  .footer-grid { grid-template-columns:1fr; }
  .footer-brand { grid-column: span 1; }
  .footer-grid .footer-col:last-child { grid-column: span 1; }
  .hero-buttons { flex-direction:column; align-items:stretch; }
  .hero-buttons .btn { width:100%; }
  .cta-banner { padding:44px 20px; }
  .stat-item { padding:24px 14px; }
  .hero h1 { font-size: clamp(1.9rem, 9vw, 2.6rem); }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration:.01ms !important;
    transition-duration:.01ms !important;
    scroll-behavior:auto !important;
  }
}