:root{
  --paper:#FAF5EB; --paper-deep:#F3EAD9; --card:#FFFDF7;
  --ink:#22304A; --ink-soft:#5A5344; --ink-faint:#8A7E6A;
  --line:#E2D5BC; --line-strong:#D8C7A6;
  --amber:#E8862E; --amber-deep:#C96A12; --amber-bg:#FFF9EF;
  --blue:#3A6EA5; --blue-deep:#2C5480; --blue-bg:#F2F7FD;
  --teal:#0F766E; --teal-deep:#0B5D57; --teal-bg:#EEF7F4;
  --violet:#7C5CBF; --violet-deep:#6B5E86; --violet-bg:#F7F4FB;
  --serif: Georgia, "Songti SC", "STSong", "SimSun", serif;
  --sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", -apple-system, sans-serif;
  --shadow: 0 2px 6px rgba(84,66,38,.06), 0 14px 34px rgba(84,66,38,.08);
  --radius: 14px;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  font-family:var(--sans); color:var(--ink); background:var(--paper);
  background-image:radial-gradient(rgba(140,115,70,.05) 1px, transparent 1px);
  background-size:26px 26px; line-height:1.7; -webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none}
button{font:inherit;background:none;border:none;cursor:pointer;color:inherit}
.wrap{max-width:1160px;margin:0 auto;padding:0 28px}

/* ===== Header ===== */
.site-header{position:sticky;top:0;z-index:50;background:rgba(250,245,235,.92);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.site-nav{display:flex;align-items:center;justify-content:space-between;height:64px;gap:16px}
.site-brand{display:flex;align-items:center;gap:10px;font-family:var(--serif);font-weight:700;font-size:18px;letter-spacing:1px}
.site-brand svg{display:block}
.site-nav-links{display:flex;gap:20px;font-size:14px;color:var(--ink-soft);align-items:center;overflow-x:auto}
.site-nav-links a{padding:6px 2px;border-bottom:2px solid transparent;transition:border-color .2s;white-space:nowrap}
.site-nav-links a:hover{border-bottom-color:var(--amber);color:var(--ink)}
.site-nav-links .nav-cta{background:var(--teal);color:#F4FBF9;font-size:13.5px;padding:9px 18px;border-radius:999px;border-bottom:none;transition:transform .2s,box-shadow .2s}
.site-nav-links .nav-cta:hover{transform:translateY(-1px);box-shadow:0 6px 16px rgba(15,118,110,.28);border-bottom:none}
.site-mobile-toggle{display:none;background:none;border:none;font-size:22px;color:var(--ink)}

/* ===== Sections ===== */
section{padding:56px 0}
.sec-head{margin-bottom:30px;max-width:760px}
.sec-eyebrow{display:inline-flex;align-items:center;gap:8px;font-size:13px;color:var(--ink-faint);letter-spacing:2px;margin-bottom:14px}
.sec-eyebrow::before{content:"";width:34px;height:1.5px;background:var(--amber)}
.sec-title{font-family:var(--serif);font-weight:700;font-size:clamp(26px,3.4vw,38px);line-height:1.34;letter-spacing:.5px;margin-bottom:12px}
.sec-desc{font-size:15.5px;color:var(--ink-soft)}

/* ===== Hero ===== */
.hero{padding:66px 0 40px}
.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:44px;align-items:center}
.hero-eyebrow{display:inline-flex;align-items:center;gap:8px;font-size:13px;color:var(--ink-faint);letter-spacing:2px;margin-bottom:20px}
.hero-eyebrow::before{content:"";width:34px;height:1.5px;background:var(--amber)}
.hero-h1{font-family:var(--serif);font-weight:700;font-size:clamp(32px,4.4vw,50px);line-height:1.3;letter-spacing:1px;margin-bottom:20px}
.hero-h1 .b-teal{color:var(--teal-deep)}
.hero-h1 .b-amber{color:var(--amber-deep)}
.hero-sub{font-size:16.5px;color:var(--ink-soft);margin-bottom:10px;max-width:540px}
.hero-sub b{color:var(--ink)}
.hero-note{font-size:13px;color:var(--ink-faint);margin-bottom:26px}
.hero-cta{display:flex;flex-wrap:wrap;gap:14px;margin-bottom:30px}
.btn{display:inline-flex;align-items:center;gap:8px;font-size:15px;font-weight:600;padding:14px 26px;border-radius:12px;transition:transform .2s,box-shadow .2s}
.btn:hover{transform:translateY(-2px)}
.btn-primary{background:var(--teal);color:#F4FBF9;box-shadow:0 10px 24px rgba(15,118,110,.28)}
.btn-primary:hover{box-shadow:0 14px 30px rgba(15,118,110,.36)}
.btn-outline{border:1.8px solid var(--amber);color:var(--amber-deep);background:rgba(255,249,239,.7)}
.btn-outline:hover{background:#FFF6E8}
/* hero meta */
.hero-meta{display:flex;flex-wrap:wrap;gap:10px 18px;font-size:13px;color:var(--ink-faint)}
.hero-meta b{color:var(--ink-soft);font-weight:600}
/* hero visual: product mini-cards */
.hero-board{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.mini-card{border:1px solid var(--line);border-radius:14px;padding:16px;background:var(--card);box-shadow:var(--shadow)}
.mini-card .mini-top{display:flex;align-items:center;justify-content:space-between;margin-bottom:8px}
.mini-card .mini-k{height:10px;width:10px;border-radius:3px}
.mini-card h3{font-family:var(--serif);font-size:17px;margin-bottom:4px}
.mini-card p{font-size:12.5px;color:var(--ink-soft)}
.mini-card .mini-tag{font-size:11px;color:var(--ink-faint);border:1px solid var(--line-strong);border-radius:999px;padding:1px 8px}

/* ===== Stage picker ===== */
.stage-bar{background:var(--card);border:1px solid var(--line);border-radius:14px;box-shadow:var(--shadow);padding:20px}
.stage-bar .sb-label{font-size:13px;color:var(--ink-faint);margin-bottom:14px}
.stage-pills{display:flex;flex-wrap:wrap;gap:10px}
.stage-pill{border:1.5px solid var(--line-strong);border-radius:999px;padding:8px 18px;font-size:14px;color:var(--ink-soft);transition:all .2s}
.stage-pill:hover{border-color:var(--teal);color:var(--teal-deep)}
.stage-pill.active{background:var(--teal);color:#F4FBF9;border-color:var(--teal);font-weight:600}
.stage-hint{margin-top:14px;font-size:13.5px;color:var(--ink-soft);min-height:22px}
.stage-hint b{color:var(--teal-deep)}

/* ===== Product cards ===== */
.grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.p-card{position:relative;border:1px solid var(--line);border-radius:14px;padding:22px 20px 20px;background:var(--card);box-shadow:var(--shadow);display:flex;flex-direction:column;gap:12px;transition:opacity .25s,transform .25s}
.p-card::before{content:"";position:absolute;inset:0 0 auto 0;height:4px;border-radius:14px 14px 0 0}
.p-card .p-stage-tag{position:absolute;top:18px;right:16px;font-size:11px;border:1px solid var(--line-strong);border-radius:999px;padding:1px 8px;color:var(--ink-faint)}
.p-card h3{font-family:var(--serif);font-size:20px}
.p-card .p-promise{font-family:var(--serif);font-weight:700;font-size:15.5px;line-height:1.5}
.p-card ul{list-style:none;font-size:13.5px;color:var(--ink-soft);flex:1;display:flex;flex-direction:column;gap:7px}
.p-card li::before{content:"·";font-weight:700;margin-right:6px}
.p-card .p-price{font-size:13px;color:var(--ink-soft)}
.p-card .p-price b{color:var(--ink)}
.p-card .p-go{display:inline-flex;align-items:center;gap:6px;font-weight:600;font-size:14px}
.p-card.is-hidden{opacity:.14;transform:scale(.97);pointer-events:none}
.p-card.is-dim{opacity:.32}
@media(max-width:960px){.grid-4{grid-template-columns:1fr 1fr}}

/* product color accents */
.c-danci{--p:#E8862E;--pd:#C96A12}
.c-cihui{--p:#3A6EA5;--pd:#2C5480}
.c-yfhh{--p:#0F766E;--pd:#0B5D57}
.c-yufa{--p:#7C5CBF;--pd:#6B5E86}
.p-card::before{background:var(--p)}
.p-card .p-promise{color:var(--pd)}
.p-card .p-go{color:var(--pd)}

/* ===== Product tabs ===== */
.tabs{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:22px}
.tab-btn{border:1.5px solid var(--line-strong);border-radius:999px;padding:8px 18px;font-size:14px;color:var(--ink-soft);transition:all .2s}
.tab-btn:hover{border-color:var(--teal);color:var(--teal-deep)}
.tab-btn.active{border-color:transparent;font-weight:600}
.panel{display:none;border:1px solid var(--line);border-radius:14px;background:var(--card);box-shadow:var(--shadow);padding:26px}
.panel.show{display:block;animation:fadeIn .25s ease}
@keyframes fadeIn{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}
.panel-grid{display:grid;grid-template-columns:240px 1fr;gap:24px;align-items:start}
.panel-side{border-right:1px solid var(--line);padding-right:22px}
.panel-side h3{font-family:var(--serif);font-size:22px;margin-bottom:6px}
.panel-side .ps-badge{display:inline-block;font-size:12px;border:1px solid var(--line-strong);border-radius:999px;padding:2px 10px;color:var(--ink-faint);margin:6px 0 12px}
.panel-side .ps-price{font-size:13.5px;color:var(--ink-soft);margin-bottom:16px}
.panel-side .ps-price b{color:var(--ink);display:block;font-size:15px}
.panel-side .ps-cta{width:100%}
.panel-main h4{font-size:14px;color:var(--ink-soft);margin:14px 0 8px;font-weight:600}
.panel-main h4:first-child{margin-top:0}
.panel-main ul{list-style:none;display:grid;grid-template-columns:1fr 1fr;gap:8px 20px}
.panel-main li{font-size:14px;color:var(--ink-soft);position:relative;padding-left:16px}
.panel-main li::before{content:"—";position:absolute;left:0;color:var(--amber)}
.panel-main p{font-size:13.5px;color:var(--ink-faint)}
@media(max-width:800px){.panel-grid{grid-template-columns:1fr}.panel-side{border-right:none;border-bottom:1px solid var(--line);padding:0 0 16px;margin-bottom:16px}}

/* ===== Methodology / trust ===== */
.method-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:14px}
.method-item{border:1px solid var(--line);border-radius:14px;padding:20px 16px;background:var(--card);box-shadow:var(--shadow)}
.method-item .m-no{font-family:var(--serif);font-size:28px;color:var(--teal);line-height:1}
.method-item h3{font-size:15px;margin:8px 0 6px}
.method-item p{font-size:13px;color:var(--ink-soft)}
@media(max-width:960px){.method-grid{grid-template-columns:repeat(2,1fr)}}
.trust-band{background:var(--teal-bg);border:1px solid rgba(15,118,110,.18);border-radius:16px;padding:26px;margin-top:24px}
.trust-band h3{font-family:var(--serif);font-size:18px;color:var(--teal-deep);margin-bottom:14px}
.trust-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:12px 24px}
.trust-grid div{font-size:14px;color:var(--ink-soft);position:relative;padding-left:22px}
.trust-grid div::before{content:"✓";position:absolute;left:0;color:var(--teal);font-weight:700}
@media(max-width:720px){.trust-grid{grid-template-columns:1fr}}

/* ===== Comparison ===== */
.cmp-scroll{overflow-x:auto;border:1px solid var(--line);border-radius:14px;background:var(--card);box-shadow:var(--shadow)}
.cmp-table{border-collapse:collapse;width:100%;min-width:860px;font-size:13.5px}
.cmp-table th,.cmp-table td{padding:14px 14px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}
.cmp-table thead th{font-size:14px;border-bottom:2px solid var(--line-strong)}
.cmp-table thead th.c-danci{color:#C96A12}.cmp-table thead th.c-cihui{color:#2C5480}
.cmp-table thead th.c-yfhh{color:#0B5D57}.cmp-table thead th.c-yufa{color:#6B5E86}
.cmp-table tbody tr:hover{background:var(--paper)}
.cmp-table td{border-top:1px solid var(--line)}
.cmp-table .dimen{font-weight:600;color:var(--ink-soft);white-space:nowrap;width:120px}
.cmp-table .dom{color:var(--ink-faint)}
.cmp-note{font-size:12.5px;color:var(--ink-faint);margin-top:10px}

/* ===== FAQ ===== */
.faq{border:1px solid var(--line);border-radius:14px;background:var(--card);box-shadow:var(--shadow);overflow:hidden}
.faq details{border-bottom:1px solid var(--line)}
.faq details:last-child{border-bottom:none}
.faq summary{list-style:none;padding:18px 22px;font-weight:600;font-size:15px;cursor:pointer;display:flex;justify-content:space-between;align-items:center;gap:12px}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";font-size:20px;color:var(--amber);transition:transform .2s;flex:none}
.faq details[open] summary::after{content:"–"}
.faq .faq-a{padding:0 22px 18px;color:var(--ink-soft);font-size:14.5px;max-width:820px}

/* ===== Final CTA ===== */
.final{background:linear-gradient(160deg,var(--paper-deep),var(--paper));text-align:center;padding:64px 0}
.final h2{font-family:var(--serif);font-size:clamp(26px,3.6vw,40px);margin-bottom:12px;letter-spacing:.5px}
.final p{color:var(--ink-soft);margin-bottom:26px;font-size:15.5px}
.final .f-actions{display:flex;flex-wrap:wrap;gap:14px;justify-content:center;margin-bottom:26px}
.link-row{display:flex;flex-wrap:wrap;gap:10px;justify-content:center;font-size:13.5px;color:var(--ink-soft)}
.link-row a{border:1px solid var(--line-strong);border-radius:999px;padding:6px 14px;transition:all .2s}
.link-row a:hover{border-color:var(--teal);color:var(--teal-deep)}

/* ===== Footer ===== */
.site-footer{border-top:1px solid var(--line);padding:40px 0 28px;background:rgba(243,234,217,.4)}
.site-footer-top{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;margin-bottom:24px}
.site-footer-col h4{font-size:13px;color:var(--ink-faint);margin-bottom:12px;letter-spacing:1px}
.site-footer-col a{display:block;font-size:14px;color:var(--ink-soft);padding:4px 0}
.site-footer-col a:hover{color:var(--teal-deep)}
.site-footer-doms{font-size:13px;color:var(--ink-soft);margin-bottom:8px}
.site-footer-doms b{color:var(--ink)}
.site-footer-legal{font-size:12px;color:var(--ink-faint);line-height:1.7}
@media(max-width:760px){.site-footer-top{grid-template-columns:1fr 1fr}}

/* ===== Responsive ===== */
@media(max-width:1024px){.hero-grid{grid-template-columns:1fr}.hero-board{margin-top:8px}}
@media(max-width:860px){.site-nav-links{display:none}.site-mobile-toggle{display:block}}
@media(max-width:640px){.panel-main ul{grid-template-columns:1fr}.grid-4{grid-template-columns:1fr}}
/* safe-area */
@supports(padding:max(0px)){section,.wrap{padding-left:max(28px,env(safe-area-inset-left));padding-right:max(28px,env(safe-area-inset-right))}}