/* ============================================================
   VASZIN — brand site styles
   Palette: warm gold-bronze + ivory (sampled from brand assets)
   One hue: H~36° gold. No second accent.
   ============================================================ */
:root {
  --gold: #A9834F;          /* 品牌金棕：信任条实测主色 */
  --gold-dark: #8A6B3E;     /* hover / 强调深一档 */
  --gold-deep: #6E5530;     /* 深金棕（深色底用） */
  --ink: #2B251E;           /* 标题/正文暖黑 */
  --ink-soft: #55493C;      /* 次级文字 */
  --muted: #847868;         /* 弱化文字（≥4.5:1 on cream） */
  --cream: #F7F5F0;         /* 页面底 */
  --cream-2: #EFEAE1;       /* 交替带 */
  --white: #FFFFFF;
  --line: #E5DECF;          /* 发丝线 */
  --radius: 14px;
  --radius-l: 22px;
  --shadow: 0 10px 30px rgba(43, 37, 30, .08);
  --serif: "Playfair Display", Georgia, "Times New Roman", serif;
  --sans: "Poppins", "Segoe UI", system-ui, -apple-system, Arial, sans-serif;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--sans);
  color: var(--ink);
  background: var(--cream);
  font-size: 15.5px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }

h1, h2, h3, .serif {
  font-family: var(--serif);
  font-weight: 500;
  letter-spacing: .02em;
  line-height: 1.15;
  color: var(--ink);
}

.wrap { max-width: 1180px; margin: 0 auto; padding: 0 24px; }
.narrow { max-width: 860px; margin: 0 auto; padding: 0 24px; }

/* ---------- 公告条 ---------- */
.topbar {
  background: linear-gradient(90deg, #6E5530, #8A6B3E 45%, #A9834F);
  color: rgba(255,255,255,.92);
  text-align: center;
  font-size: 12.5px;
  letter-spacing: .14em;
  text-transform: uppercase;
  padding: 9px 16px;
}

/* ---------- Header ---------- */
.hdr {
  position: sticky; top: 0; z-index: 50;
  background: rgba(247,245,240,.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.hdr-in {
  max-width: 1180px; margin: 0 auto; padding: 14px 24px;
  display: flex; align-items: center; gap: 28px;
}
.logo img { height: 30px; width: auto; }
.logo-text {
  font-family: var(--sans); font-weight: 800; font-style: italic;
  font-size: 24px; letter-spacing: .04em; color: var(--ink);
}
.nav { display: flex; gap: 26px; margin-left: auto; align-items: center; }
.nav a {
  font-size: 13.5px; letter-spacing: .08em; text-transform: uppercase;
  color: var(--ink-soft); padding: 6px 2px; border-bottom: 2px solid transparent;
  transition: color .2s, border-color .2s;
}
.nav a:hover, .nav a.on { color: var(--gold-dark); border-color: var(--gold); }
.nav .nav-cta {
  background: var(--gold); color: #fff; padding: 9px 18px; border-radius: 999px;
  border-bottom: none; font-weight: 600;
}
.nav .nav-cta:hover { background: var(--gold-dark); color: #fff; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-block; padding: 13px 30px; border-radius: 999px;
  font-size: 13px; letter-spacing: .12em; text-transform: uppercase;
  font-weight: 600; transition: all .2s; border: 1.5px solid transparent;
}
.btn-gold { background: var(--gold); color: #fff; }
.btn-gold:hover { background: var(--gold-dark); transform: translateY(-1px); }
.btn-line { border-color: var(--gold); color: var(--gold-dark); }
.btn-line:hover { background: var(--gold); color: #fff; }
.btn-ghost { border-color: rgba(255,255,255,.6); color: #fff; }
.btn-ghost:hover { background: rgba(255,255,255,.12); }

/* ---------- Hero ---------- */
.hero {
  background: linear-gradient(180deg, #FBFAF7 0%, var(--cream) 100%);
  overflow: hidden;
}
.hero-in {
  max-width: 1180px; margin: 0 auto; padding: 64px 24px 72px;
  display: grid; grid-template-columns: 1.05fr .95fr; gap: 56px; align-items: center;
}
.kicker {
  display: inline-flex; align-items: center; gap: 10px;
  font-size: 12px; letter-spacing: .22em; text-transform: uppercase;
  color: var(--gold-dark); font-weight: 600; margin-bottom: 18px;
}
.kicker::before { content: ""; width: 34px; height: 1.5px; background: var(--gold); }
.hero h1 { font-size: clamp(38px, 4.6vw, 58px); margin-bottom: 20px; }
.hero h1 em { font-style: italic; color: var(--gold-dark); }
.hero p.lead { font-size: 17px; color: var(--ink-soft); max-width: 46ch; margin-bottom: 30px; }
.hero-cta { display: flex; gap: 14px; flex-wrap: wrap; }
.hero-media { position: relative; }
.hero-media .ph {
  border-radius: var(--radius-l); overflow: hidden; box-shadow: var(--shadow);
  background: var(--white);
  max-height: 640px;
}
.hero-media .ph img { width: 100%; height: 100%; object-fit: cover; object-position: center top; }

/* ---------- 信任条 ---------- */
.trust { background: var(--white); border-block: 1px solid var(--line); }
.trust img { width: 100%; max-height: 170px; object-fit: contain; padding: 10px 0; }
.trust-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px;
  padding: 34px 24px; max-width: 1180px; margin: 0 auto;
}
.trust-item { display: flex; gap: 14px; align-items: flex-start; }
.trust-item .t-ico { font-size: 26px; line-height: 1; }
.trust-item h4 {
  font-family: var(--sans); font-size: 14.5px; font-weight: 700;
  letter-spacing: .02em; color: var(--gold-dark); margin-bottom: 4px;
}
.trust-item p { font-size: 13.5px; color: var(--muted); line-height: 1.55; }

/* ---------- 区块 ---------- */
.sec { padding: 84px 0; }
.sec-alt { background: var(--white); }
.sec-head { text-align: center; max-width: 640px; margin: 0 auto 48px; }
.sec-head .kicker { justify-content: center; }
.sec-head .kicker::after { content: ""; width: 34px; height: 1.5px; background: var(--gold); }
.sec-head h2 { font-size: clamp(28px, 3.2vw, 40px); margin-bottom: 12px; }
.sec-head p { color: var(--muted); }

/* ---------- 产品卡 ---------- */
.grid { display: grid; gap: 26px; }
.g3 { grid-template-columns: repeat(3, 1fr); }
.g4 { grid-template-columns: repeat(4, 1fr); }
.pcard {
  background: var(--white); border-radius: var(--radius-l); overflow: hidden;
  box-shadow: 0 4px 18px rgba(43,37,30,.06); transition: transform .25s, box-shadow .25s;
  display: flex; flex-direction: column;
}
.pcard:hover { transform: translateY(-5px); box-shadow: var(--shadow); }
.pcard .pimg { aspect-ratio: 1; overflow: hidden; background: var(--cream-2); }
.pcard .pimg img { width: 100%; height: 100%; object-fit: cover; transition: transform .4s; }
.pcard:hover .pimg img { transform: scale(1.04); }
.pcard .pbody { padding: 20px 22px 24px; display: flex; flex-direction: column; gap: 8px; flex: 1; }
.pcard .ptag {
  font-size: 11px; letter-spacing: .16em; text-transform: uppercase;
  color: var(--gold-dark); font-weight: 700;
}
.pcard h3 { font-size: 19px; }
.pcard p { font-size: 13.5px; color: var(--muted); flex: 1; }
.pcard .plink {
  font-size: 12.5px; letter-spacing: .1em; text-transform: uppercase;
  font-weight: 700; color: var(--gold-dark); margin-top: 6px;
}
.pcard .plink:hover { color: var(--ink); }

/* ---------- 深色带（品牌理念） ---------- */
.deep {
  background: linear-gradient(160deg, #4A3A22 0%, #6E5530 55%, #8A6B3E 100%);
  color: rgba(255,255,255,.94);
}
.deep h2, .deep h3 { color: #fff; }
.deep .kicker { color: #E8CFA4; }
.deep .kicker::before { background: #E8CFA4; }
.deep p { color: rgba(255,255,255,.82); }

/* ---------- 步骤/特性 ---------- */
.feat { display: grid; grid-template-columns: repeat(3, 1fr); gap: 34px; }
.feat .f { background: var(--white); border: 1px solid var(--line); border-radius: var(--radius-l); padding: 30px 28px; }
.feat .f .num {
  font-family: var(--serif); font-size: 34px; color: var(--gold); margin-bottom: 10px;
}
.feat .f h3 { font-size: 20px; margin-bottom: 8px; }
.feat .f p { font-size: 14px; color: var(--muted); }

/* ---------- 图文分栏 ---------- */
.split { display: grid; grid-template-columns: 1fr 1fr; gap: 54px; align-items: center; }
.split.rev .s-media { order: 2; }
.s-media img { border-radius: var(--radius-l); box-shadow: var(--shadow); width: 100%; }
.s-copy h2 { font-size: clamp(26px, 3vw, 36px); margin-bottom: 16px; }
.s-copy p { color: var(--ink-soft); margin-bottom: 14px; }
.s-copy .btn { margin-top: 14px; }

/* ---------- 数据条 ---------- */
.stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; text-align: center; margin-top: 40px; }
.stats .st b { display: block; font-family: var(--serif); font-size: 40px; color: #fff; }
.stats .st span { font-size: 13px; letter-spacing: .1em; text-transform: uppercase; color: rgba(255,255,255,.75); }

/* ---------- FAQ ---------- */
.faq { max-width: 800px; margin: 0 auto; }
.faq details {
  background: var(--white); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 18px 22px; margin-bottom: 12px;
}
.faq details[open] { border-color: var(--gold); }
.faq summary {
  cursor: pointer; font-weight: 600; font-size: 15.5px; color: var(--ink);
  list-style: none; position: relative; padding-right: 30px;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: "+"; position: absolute; right: 2px; top: 50%; transform: translateY(-50%);
  font-size: 20px; color: var(--gold);
}
.faq details[open] summary::after { content: "–"; }
.faq details p { margin-top: 10px; color: var(--ink-soft); font-size: 14.5px; }

/* ---------- 页面头（内页） ---------- */
.page-head {
  background: linear-gradient(180deg, #FBFAF7, var(--cream-2));
  padding: 64px 0 56px; text-align: center; border-bottom: 1px solid var(--line);
}
.page-head h1 { font-size: clamp(32px, 4vw, 46px); margin-bottom: 10px; }
.page-head p { color: var(--muted); max-width: 56ch; margin: 0 auto; }
/* 左对齐版（长文页用，配合 .kicker 与 .prose-lead） */
.page-head.text-left { text-align: left; }
.page-head.text-left p { margin: 0; max-width: 62ch; color: var(--ink-soft); }

/* ---------- 内容页 ---------- */
.prose { max-width: 800px; margin: 0 auto; padding: 60px 24px; }
.prose h2 { font-size: 26px; margin: 38px 0 14px; }
.prose h3 { font-size: 20px; margin: 28px 0 10px; }
.prose p { margin-bottom: 14px; color: var(--ink-soft); }
.prose ul { list-style: disc; padding-left: 22px; margin-bottom: 14px; color: var(--ink-soft); }
.prose li { margin-bottom: 8px; }

/* ---------- 联系页 ---------- */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 46px; max-width: 1080px; margin: 0 auto; padding: 64px 24px; }
.c-card {
  background: var(--white); border: 1px solid var(--line); border-radius: var(--radius-l);
  padding: 30px; margin-bottom: 18px;
}
.c-card h3 { font-size: 19px; margin-bottom: 6px; }
.c-card p { font-size: 14px; color: var(--muted); margin-bottom: 4px; }
.c-card a { color: var(--gold-dark); font-weight: 600; }
.form-card { background: var(--white); border: 1px solid var(--line); border-radius: var(--radius-l); padding: 34px; }
.form-card label { display: block; font-size: 13px; font-weight: 600; letter-spacing: .04em; margin: 16px 0 6px; }
.form-card input, .form-card textarea {
  width: 100%; padding: 12px 14px; border: 1px solid var(--line); border-radius: 10px;
  font-family: var(--sans); font-size: 14.5px; background: var(--cream); color: var(--ink);
}
.form-card input:focus, .form-card textarea:focus { outline: 2px solid var(--gold); border-color: transparent; }
.form-note { font-size: 12.5px; color: var(--muted); margin-top: 12px; }

/* ---------- CTA ---------- */
.cta {
  background: linear-gradient(150deg, #6E5530, #8A6B3E 55%, #A9834F);
  text-align: center; color: #fff; padding: 84px 24px;
}
.cta h2 { color: #fff; font-size: clamp(28px, 3.4vw, 42px); margin-bottom: 14px; }
.cta p { color: rgba(255,255,255,.85); max-width: 52ch; margin: 0 auto 28px; }

/* ---------- Footer ---------- */
.ftr { background: #221C15; color: rgba(255,255,255,.72); padding: 64px 0 28px; }
.ftr-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1.2fr; gap: 40px; max-width: 1180px; margin: 0 auto; padding: 0 24px 40px; }
.ftr .logo-text { color: #fff; }
.ftr h4 { color: #fff; font-size: 13px; letter-spacing: .14em; text-transform: uppercase; margin-bottom: 16px; font-family: var(--sans); font-weight: 700; }
.ftr ul li { margin-bottom: 10px; }
.ftr a { font-size: 14px; transition: color .2s; }
.ftr a:hover { color: #E8CFA4; }
.ftr p { font-size: 14px; }
.ftr-base {
  border-top: 1px solid rgba(255,255,255,.12);
  max-width: 1180px; margin: 0 auto; padding: 22px 24px 0;
  display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap;
  font-size: 12.5px; color: rgba(255,255,255,.5);
}

/* ============================================================
   SEO / GEO 内容零件
   TL;DR 摘要 · 对照表 · 可见问答 · 文献引用 · 作者行 · 内链簇
   ============================================================ */

/* 无障碍跳转链接（也是 SEO 加分项） */
.skip {
  position: absolute; left: -9999px; top: 0; z-index: 999;
  background: var(--gold-dark); color: #fff;
  padding: 12px 20px; border-radius: 0 0 var(--radius) 0; font-size: 14px;
}
.skip:focus { left: 0; }

.sec-tight { padding: 44px 0; }

/* ---------- 面包屑 ---------- */
.breadcrumb { padding: 18px 24px 0; }
.breadcrumb ol { display: flex; gap: 8px; flex-wrap: wrap; font-size: 12.5px;
  letter-spacing: .04em; color: var(--muted); list-style: none; }
.breadcrumb li + li::before { content: "/"; margin-right: 8px; color: var(--line); }
.breadcrumb a { color: var(--gold-dark); }
.breadcrumb a:hover { text-decoration: underline; }

/* ---------- 正文排版（GEO 可引用块） ---------- */
.prose { font-size: 16px; color: var(--ink-soft); line-height: 1.8; }
.prose h2 { font-size: clamp(24px, 2.6vw, 32px); margin: 0 0 16px; color: var(--ink); }
.prose h3 { font-size: 18.5px; margin: 30px 0 10px; color: var(--ink); }
.prose p { margin-bottom: 16px; max-width: 68ch; }
.prose strong { color: var(--ink); font-weight: 600; }
.prose-lead { font-size: 17px; color: var(--ink-soft); }
.prose a { color: var(--gold-dark); text-decoration: underline; text-underline-offset: 2px; }

/* ---------- TL;DR 摘要块：AI 优先摘这里 ---------- */
.tldr {
  background: var(--white); border: 1px solid var(--line);
  border-left: 4px solid var(--gold); border-radius: var(--radius);
  padding: 28px 32px; box-shadow: var(--shadow);
}
.tldr h2 { font-size: 16px; letter-spacing: .16em; text-transform: uppercase;
  font-family: var(--sans); font-weight: 700; color: var(--gold-dark); margin-bottom: 14px; }
.tldr ul { display: grid; gap: 10px; }
.tldr li { position: relative; padding-left: 20px; font-size: 15px;
  color: var(--ink-soft); line-height: 1.7; }
.tldr li::before { content: ""; position: absolute; left: 0; top: .62em;
  width: 7px; height: 7px; border-radius: 50%; background: var(--gold); }
.tldr strong { color: var(--ink); font-weight: 600; }

/* ---------- 对照表 ---------- */
.cmp-wrap { overflow-x: auto; margin: 8px 0 4px; border: 1px solid var(--line);
  border-radius: var(--radius); background: var(--white); }
table.cmp { width: 100%; border-collapse: collapse; font-size: 14.5px; min-width: 620px; }
table.cmp caption { text-align: left; padding: 16px 20px 0; font-size: 13px; color: var(--muted); }
table.cmp th, table.cmp td { padding: 13px 20px; text-align: left;
  border-bottom: 1px solid var(--line); vertical-align: top; }
table.cmp thead th { background: var(--cream-2); font-family: var(--sans); font-weight: 700;
  font-size: 12px; letter-spacing: .1em; text-transform: uppercase;
  color: var(--gold-deep); white-space: nowrap; }
table.cmp tbody th { font-weight: 600; color: var(--ink); white-space: nowrap; }
table.cmp tbody tr:last-child th, table.cmp tbody tr:last-child td { border-bottom: 0; }
table.cmp td { color: var(--ink-soft); }

/* ---------- 问答：可见 h3+p，不折叠 ---------- */
.qa { padding: 20px 0; border-bottom: 1px solid var(--line); }
.qa:last-child { border-bottom: 0; padding-bottom: 0; }
.qa h3 { margin: 0 0 8px; font-size: 18px; }
.qa p { margin-bottom: 0; }

/* ---------- 文献引用 ---------- */
.cite { display: grid; gap: 14px; margin: 18px 0 22px; }
.cite li { padding-left: 20px; position: relative; font-size: 14.5px; line-height: 1.65; }
.cite li::before { content: "\2197"; position: absolute; left: 0; color: var(--gold); }
.cite a { color: var(--gold-dark); text-decoration: underline; text-underline-offset: 2px; }
.cite-src { display: block; font-size: 12.5px; color: var(--muted); margin-top: 2px; }
.disclaimer { font-size: 12.5px; color: var(--muted);
  border-top: 1px dashed var(--line); padding-top: 14px; }

/* ---------- 作者 / 更新时间（E-E-A-T） ---------- */
.byline { display: flex; gap: 18px; flex-wrap: wrap; font-size: 12.5px;
  letter-spacing: .06em; text-transform: uppercase; color: var(--muted); margin-top: 8px; }
.byline span + span::before { content: "\00b7"; margin-right: 18px; }

/* ---------- 相关阅读内链簇 ---------- */
.related-h { font-size: 16px; letter-spacing: .16em; text-transform: uppercase;
  font-family: var(--sans); font-weight: 700; color: var(--gold-dark); margin-bottom: 18px; }
.related { display: grid; gap: 14px; }
.related li { border-left: 2px solid var(--gold); padding-left: 16px; }
.related a { font-family: var(--serif); font-size: 18px; color: var(--ink);
  display: block; margin-bottom: 2px; }
.related a:hover { color: var(--gold-dark); }
.related span { font-size: 13.5px; color: var(--muted); }

/* ---------- 响应式 ---------- */
@media (max-width: 960px) {
  .g4 { grid-template-columns: repeat(2, 1fr); }
  .g3 { grid-template-columns: repeat(2, 1fr); }
  .hero-in, .split, .contact-grid { grid-template-columns: 1fr; gap: 36px; }
  .split.rev .s-media { order: 0; }
  .feat { grid-template-columns: 1fr; }
  .ftr-grid { grid-template-columns: 1fr 1fr; }
  .stats { grid-template-columns: 1fr; gap: 28px; }
  .trust-grid { grid-template-columns: 1fr; padding: 24px; }
}
@media (max-width: 620px) {
  .g3, .g4 { grid-template-columns: 1fr; }
  .nav { display: none; }
  .sec { padding: 60px 0; }
  .ftr-grid { grid-template-columns: 1fr; }
}