/* ============================================================
   黄文网站 — 设计系统
   风格：Editorial Botanical / 亮纸杂志风
   底色：暖米白 · 主色：橘红 × 墨绿 × 淡紫
   ============================================================ */

:root{
  --paper:#FBF6EE;
  --paper-2:#F2E9DC;
  --paper-3:#EAF3EE;
  --ink:#1D2B32;
  --ink-soft:rgba(29,43,50,.6);
  --line:rgba(29,43,50,.14);
  --tang:#FF5A2B;
  --tang-soft:#FFD9CB;
  --teal:#0F7A6B;
  --mint:#DCF0E7;
  --lilac:#D6C7F7;
  --radius:20px;
  --shadow-hard:6px 6px 0 var(--ink);
}

*, *::before, *::after { margin:0; padding:0; box-sizing:border-box; }

html{ scroll-behavior:smooth; scroll-padding-top:90px; }

body {
  font-family: system-ui, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  overflow-x:hidden;
  background:var(--paper);
  color:var(--ink);
  line-height:1.65;
  -webkit-font-smoothing:antialiased;
}

img{ display:block; max-width:100%; }
a{ color:inherit; }
::selection{ background:var(--tang); color:#fff; }
:focus-visible{ outline:2px dashed var(--tang); outline-offset:3px; }

/* ---------------- 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-2);
  border-top:1px solid var(--line);
  border-bottom:1px solid var(--line);
}

/* ---------------- 导航 ---------------- */
.site-header {
  position:fixed; top:0; left:0; width:100%; z-index:1000;
  background:rgba(251,246,238,0.92);
  backdrop-filter:blur(10px) saturate(140%);
  border-bottom:1.5px solid var(--line);
}

.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:1.2rem; letter-spacing:-.02em;
  text-decoration:none; color:inherit;
}

.logo-icon {
  width:36px; height:36px; border-radius:12px;
  display:flex; align-items:center; justify-content:center;
  font-size:1rem; font-weight:900;
  background:var(--tang); color:#fff;
  transform:rotate(-8deg);
  box-shadow:3px 3px 0 var(--ink);
  transition:transform .3s cubic-bezier(.34,1.56,.64,1);
}
.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); transition:color .2s;
  position:relative; padding:4px 0;
}
.main-nav a::after{
  content:''; position:absolute; left:0; bottom:0;
  width:100%; height:2px; background:var(--tang);
  transform:scaleX(0); transform-origin:right;
  transition:transform .32s cubic-bezier(.6,.05,.2,1);
}
.main-nav a:hover{ color:var(--tang); }
.main-nav a:hover::after{ transform:scaleX(1); transform-origin:left; }

.nav-cta {
  padding:9px 22px; border-radius:999px;
  color:#fff!important; font-weight:700;
  background:var(--teal);
  box-shadow:3px 3px 0 var(--ink);
  transition:transform .18s, box-shadow .18s, background .2s;
}
.nav-cta::after{ display:none; }
.nav-cta:hover{
  background:var(--tang);
  transform:translate(2px,2px);
  box-shadow:1px 1px 0 var(--ink);
}

.menu-toggle {
  display:none;
  width:44px; height:38px; align-items:center; justify-content:center;
  border:1.5px solid var(--ink); border-radius:12px;
  background:#fff; cursor:pointer; font-size:1.1rem; color:var(--ink);
}

/* ---------------- Hero ---------------- */
.hero {
  min-height:70vh;
  display:flex; align-items:center;
  padding:150px 0 80px;
  position:relative;
  overflow:hidden;
}
.hero::before{
  content:''; position:absolute; inset:0; z-index:0; pointer-events:none;
  background:
    radial-gradient(420px 420px at 88% 12%, var(--lilac) 0%, transparent 68%),
    radial-gradient(360px 360px at 12% 92%, var(--mint) 0%, transparent 70%),
    radial-gradient(240px 240px at 62% 88%, var(--tang-soft) 0%, transparent 72%);
  opacity:.85;
}
.hero::after{
  content:''; position:absolute; inset:0; z-index:0; pointer-events:none;
  background-image:radial-gradient(var(--line) 1px, transparent 1px);
  background-size:26px 26px;
  mask-image:linear-gradient(120deg, rgba(0,0,0,.5), transparent 70%);
  -webkit-mask-image:linear-gradient(120deg, rgba(0,0,0,.5), transparent 70%);
}
.hero .container{ position:relative; z-index:1; }

.hero-content { max-width:760px; }

.hero-eyebrow {
  display:inline-block; font-size:.75rem; font-weight:800;
  letter-spacing:3px; text-transform:uppercase;
  padding:6px 16px; border-radius:999px; margin-bottom:22px;
  color:var(--teal); background:var(--mint);
  border:1.5px solid var(--teal);
}

.hero h1 {
  font-size:clamp(2.1rem, 5.4vw, 4rem);
  line-height:1.08;
  font-weight:900;
  letter-spacing:-.035em;
  margin-bottom:24px;
}
.hero h1 em{
  font-style:normal; color:var(--tang);
  background:linear-gradient(transparent 62%, var(--tang-soft) 62%);
  padding:0 .12em;
}

.hero p {
  font-size:1.08rem;
  color:var(--ink-soft);
  max-width:560px; margin-bottom:36px;
}

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

.hero-image {
  border-radius:28px; overflow:hidden;
  border:1.5px solid var(--line);
  box-shadow:12px 12px 0 var(--mint);
}
.hero-image img { width:100%; height:auto; }

/* ---------------- 按钮 ---------------- */
.btn {
  display:inline-flex; align-items:center; gap:8px;
  padding:13px 30px; border-radius:999px;
  font-weight:700; font-size:.95rem;
  cursor:pointer; border:none; text-decoration:none;
  transition:transform .18s ease, box-shadow .18s ease, background .22s, color .22s;
}

.btn-primary {
  color:#fff;
  background:var(--tang);
  box-shadow:4px 4px 0 var(--ink);
}
.btn-primary:hover{
  transform:translate(3px,3px);
  box-shadow:1px 1px 0 var(--ink);
}

.btn-outline {
  background:transparent;
  border:1.5px solid var(--ink);
  color:var(--ink);
}
.btn-outline:hover{
  background:var(--ink);
  color:var(--paper);
  transform:translate(3px,3px);
  box-shadow:1px 1px 0 var(--tang);
  box-shadow:1px 1px 0 var(--tang);
}

/* ---------------- 标签 / 标题 ---------------- */
.section-label {
  display:inline-flex; align-items:center; gap:10px;
  font-size:.75rem; font-weight:800;
  letter-spacing:3px; text-transform:uppercase;
  color:var(--tang); margin-bottom:14px;
}
.section-label::before{
  content:''; width:26px; height:2px; background:var(--tang); display:block;
}

.section-title {
  font-size:clamp(1.55rem, 3.2vw, 2.4rem);
  font-weight:900; letter-spacing:-.03em;
  line-height:1.18; margin-bottom:16px;
}
.section-title::after{
  content:''; display:block; width:52px; height:6px;
  margin-top:16px; border-radius:3px;
  background:linear-gradient(90deg, var(--tang) 0 55%, var(--lilac) 55% 100%);
}
.text-center .section-title::after{ margin-left:auto; margin-right:auto; }

.section-desc {
  max-width:600px; color:var(--ink-soft);
  margin-bottom:44px; font-size:1rem;
}

/* ---------------- 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);
  padding:30px 26px 26px;
  background:#fff;
  border:1.5px solid var(--line);
  transition:transform .28s cubic-bezier(.34,1.4,.64,1), box-shadow .28s, border-color .28s;
  position:relative;
}
.category-card:hover {
  transform:translateY(-6px);
  border-color:var(--ink);
  box-shadow:6px 6px 0 var(--lilac);
}
.category-card:nth-child(3n+2):hover{ box-shadow:6px 6px 0 var(--mint); }
.category-card:nth-child(3n+3):hover{ box-shadow:6px 6px 0 var(--tang-soft); }

.card-icon {
  width:48px; height:48px; border-radius:14px;
  display:flex; align-items:center; justify-content:center;
  margin-bottom:18px; font-size:1.3rem;
  background:var(--mint); color:var(--teal);
  border:1.5px solid rgba(15,122,107,.22);
}

.card-link {
  font-weight:800; font-size:.82rem;
  letter-spacing:.06em; text-transform:uppercase;
  text-decoration:none; color:var(--tang);
  display:inline-flex; align-items:center; gap:6px;
}
.card-link::after{ content:'→'; transition:transform .25s; }
.card-link:hover::after{ transform:translateX(5px); }

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

.feature-image {
  border-radius:28px; overflow:hidden;
  border:1.5px solid var(--line);
  box-shadow:12px 12px 0 var(--lilac);
}
.feature-image img { width:100%; height:auto; }

.feature-text { max-width:520px; }

.feature-list { list-style:none; margin-top:22px; }
.feature-list li {
  padding:9px 0; display:flex; align-items:flex-start; gap:12px;
  font-size:.96rem; border-bottom:1px dashed var(--line);
}
.feature-list li:last-child{ border-bottom:none; }
.feature-list li::before {
  content:'✓';
  font-weight:900; font-size:.8rem;
  color:#fff; background:var(--teal);
  width:20px; height:20px; border-radius:50%;
  display:flex; align-items:center; justify-content:center;
  flex:0 0 20px; margin-top:4px;
}

/* ---------------- 数据条 ---------------- */
.stats-bar {
  display:grid; grid-template-columns:repeat(4,1fr);
  gap:20px; text-align:center;
}

.stat-item {
  padding:30px 18px; border-radius:var(--radius);
  background:#fff;
  border:1.5px dashed rgba(29,43,50,.22);
  transition:border-color .25s, transform .25s, background .25s;
}
.stat-item:hover{
  border-style:solid; border-color:var(--teal);
  background:var(--paper-3);
  transform:translateY(-4px);
}

.stat-number {
  font-size:clamp(1.8rem, 3.6vw, 2.6rem);
  font-weight:900; letter-spacing:-.04em;
  color:var(--teal); line-height:1.1;
}
.stat-item:nth-child(2n) .stat-number{ color:var(--tang); }

.stat-label {
  font-size:.85rem; color:var(--ink-soft);
  margin-top:8px; letter-spacing:.06em;
}

/* ---------------- 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); overflow:hidden;
  background:#fff;
  border:1.5px solid var(--line);
  transition:transform .28s cubic-bezier(.34,1.4,.64,1), box-shadow .28s, border-color .28s;
}
.content-wall-item:hover {
  transform:translateY(-6px);
  border-color:var(--ink);
  box-shadow:6px 6px 0 var(--tang-soft);
}
.content-wall-item img {
  width:100%; height:200px; object-fit:cover;
  border-bottom:1.5px solid var(--line);
}

.content-wall-body { padding:22px; }
.content-wall-body h3{ font-size:1.05rem; font-weight:800; letter-spacing:-.01em; margin-bottom:8px; }
.content-wall-body p{ font-size:.9rem; color:var(--ink-soft); }

/* ---------------- FAQ ---------------- */
.faq-list { max-width:820px; margin:0 auto; }

.faq-item {
  background:#fff;
  border:1.5px solid var(--line);
  border-radius:16px; margin-bottom:10px;
  overflow:hidden; cursor:pointer;
  transition:border-color .22s, box-shadow .22s;
}
.faq-item:hover{ border-color:var(--ink); }

.faq-item .faq-question {
  padding:18px 24px; font-weight:700; font-size:.98rem;
  display:flex; justify-content:space-between; align-items:center; gap:16px;
}
.faq-item .faq-question::after{
  content:'+'; font-size:1.35rem; font-weight:800; color:var(--tang);
  line-height:1; transition:transform .3s;
}
.faq-item.open .faq-question::after{ transform:rotate(45deg); }

.faq-item .faq-answer {
  padding:0 24px 20px; display:none;
  color:var(--ink-soft); font-size:.94rem;
}
.faq-item.open {
  border-color:var(--teal);
  box-shadow:4px 4px 0 var(--mint);
}
.faq-item.open .faq-answer { display:block; }

/* ---------------- CTA 横幅 ---------------- */
.cta-banner {
  padding:64px 28px; text-align:center;
  border-radius:32px; color:#fff;
  position:relative; overflow:hidden;
  background:linear-gradient(125deg, var(--tang) 0%, #FF8A4C 42%, var(--teal) 100%);
  box-shadow:10px 10px 0 var(--ink);
}
.cta-banner::before{
  content:''; position:absolute; inset:0; opacity:.35; pointer-events:none;
  background-image:radial-gradient(rgba(255,255,255,.75) 1px, transparent 1px);
  background-size:22px 22px;
  mask-image:linear-gradient(160deg, #000, transparent 62%);
  -webkit-mask-image:linear-gradient(160deg, #000, transparent 62%);
}
.cta-banner > *{ position:relative; z-index:1; }
.cta-banner h2 {
  color:#fff; font-size:clamp(1.5rem,3.2vw,2.3rem);
  font-weight:900; letter-spacing:-.03em; margin-bottom:14px;
}
.cta-banner p{
  color:rgba(255,255,255,.9); max-width:540px;
  margin:0 auto 30px;
}
.cta-banner .btn-primary {
  background:#fff; color:var(--tang);
  box-shadow:4px 4px 0 rgba(29,43,50,.9);
}
.cta-banner .btn-primary:hover{
  transform:translate(3px,3px);
  box-shadow:1px 1px 0 rgba(29,43,50,.9);
  background:var(--paper);
}

/* ---------------- 页脚 ---------------- */
.site-footer {
  padding:64px 0 28px;
  background:var(--paper-2);
  border-top:1.5px solid var(--line);
}
.site-footer .container { }

.footer-grid {
  display:grid; grid-template-columns:2fr 1fr 1fr 1fr;
  gap:40px;
}

.footer-brand { }
.footer-brand .logo{ margin-bottom:16px; }
.footer-brand p{ font-size:.9rem; color:var(--ink-soft); max-width:320px; }

.footer-col { }
.footer-col h4{
  font-size:.78rem; font-weight:800;
  letter-spacing:2.4px; text-transform:uppercase;
  color:var(--ink); margin-bottom:16px;
}
.footer-col a{
  display:block; font-size:.9rem; text-decoration:none;
  color:var(--ink-soft); padding:5px 0;
  transition:color .2s, transform .2s;
}
.footer-col a:hover{ color:var(--tang); transform:translateX(4px); }

.footer-bottom {
  border-top:1px solid var(--line);
  margin-top:44px; padding-top:22px;
  text-align:center; font-size:.84rem;
  color:var(--ink-soft); letter-spacing:.04em;
}

/* ---------------- 工具类 ---------------- */
.text-accent { color:var(--tang); }
.text-center { text-align:center; }
.seo-description {
  max-width:640px; margin:0 auto 48px;
  color:var(--ink-soft); font-size:.98rem;
}
.mt-0 { margin-top:0; }
.mb-0 { margin-bottom:0; }

/* ---------------- 响应式 ---------------- */
@media (max-width: 900px){
  .feature-block { gap:36px; }
}

@media (max-width: 768px) {
  .section{ padding:64px 0; }
  .hero{ padding:120px 0 64px; min-height:auto; }
  .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:68px; left:0; width:100%;
    background:var(--paper); padding:24px;
    gap:16px; border-bottom:1.5px solid var(--line);
    box-shadow:0 12px 24px rgba(29,43,50,.08);
  }
  .main-nav.open .nav-cta{ align-self:flex-start; }
  .cta-banner{ border-radius:24px; padding:48px 22px; }
}

@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; }
  .hero-buttons .btn{ justify-content:center; }
  .section-title::after{ width:40px; }
  .cta-banner{ box-shadow:6px 6px 0 var(--ink); }
}