:root{
  --bg:#f4f1ea;
  --paper:#fffdf8;
  --ink:#171717;
  --muted:#6f6a60;
  --line:#ded8cb;
  --line-strong:#c9c1b0;
  --accent:#0e5f52;
  --accent-dark:#0a3f37;
  --accent-soft:#e3efe9;
  --warn:#b45309;
  --warn-soft:#fbefdf;
  --danger:#9f2d2d;
  --danger-soft:#f8e7e4;
  --gold:#8a6218;
  --serif:"Songti SC","SimSun","Source Han Serif SC",Georgia,serif;
  --sans:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei","Segoe UI",sans-serif;
  --mono:"Cascadia Code",Consolas,"SFMono-Regular",monospace;
  --shadow:0 1px 0 rgba(23,23,23,.04),0 18px 40px -24px rgba(23,23,23,.28);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;background:var(--bg);color:var(--ink);
  font-family:var(--sans);font-size:16px;line-height:1.7;
  -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;
}
::selection{background:var(--accent);color:#fff}
a{color:inherit;text-decoration:none}
img,svg{max-width:100%}
.container{max-width:1180px;margin:0 auto;padding:0 28px}
.hidden,[hidden]{display:none !important}
.skip-link{
  position:absolute;left:16px;top:-60px;z-index:100;background:var(--accent);color:#fff;
  padding:10px 14px;font-size:14px;transition:top .15s;
}
.skip-link:focus{top:12px}

/* ---------- header ---------- */
.site-header{
  position:sticky;top:0;z-index:30;
  background:rgba(244,241,234,.86);
  border-bottom:1px solid rgba(222,216,203,.7);
  backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
}
.nav{display:flex;align-items:center;justify-content:space-between;gap:24px;height:70px}
.brand{display:inline-flex;align-items:center;gap:10px;color:var(--ink);border:none}
.brand-mark{display:inline-flex;color:var(--accent)}
.brand-text{font-size:17px;font-weight:700;letter-spacing:.02em;white-space:nowrap}
.brand-text em{
  font-style:normal;font-family:var(--mono);font-size:12px;letter-spacing:.06em;
  color:var(--muted);font-weight:500;margin-left:6px;
}
.nav-links{display:flex;align-items:center;gap:26px;font-size:14px;color:var(--muted)}
.nav-links a{position:relative;padding:4px 0;border:none}
.nav-links a::after{
  content:"";position:absolute;left:0;right:0;bottom:0;height:1px;background:var(--accent);
  transform:scaleX(0);transform-origin:left;transition:transform .2s;
}
.nav-links a:hover{color:var(--ink)}
.nav-links a:hover::after{transform:scaleX(1)}
.nav-cta{white-space:nowrap}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:44px;padding:0 18px;border:1px solid var(--line-strong);background:var(--paper);
  color:var(--ink);font-family:var(--sans);font-size:14px;font-weight:600;line-height:1;
  cursor:pointer;transition:transform .15s,background .15s,border-color .15s,color .15s;
  border-radius:2px;
}
.btn:hover{transform:translateY(-1px);border-color:var(--accent);color:var(--accent)}
.btn:active{transform:translateY(0)}
.btn:focus-visible{outline:2px solid var(--accent);outline-offset:3px}
.btn.primary{background:var(--accent);border-color:var(--accent);color:#fffdf8}
.btn.primary:hover{background:var(--accent-dark);border-color:var(--accent-dark);color:#fff}
.btn.ghost{background:transparent}
.btn.tiny{height:32px;padding:0 10px;font-size:14px;font-weight:600}
.btn.wide{width:100%}
.btn:disabled{opacity:.6;cursor:not-allowed;transform:none}
.text-link{font-size:14px;color:var(--accent);border-bottom:1px solid rgba(14,95,82,.3);padding-bottom:2px}
.text-link:hover{border-bottom-color:var(--accent)}
.text-link span{display:inline-block;transition:transform .15s}
.text-link:hover span{transform:translateX(3px)}

/* ---------- hero ---------- */
.hero{position:relative;overflow:hidden;border-bottom:1px solid var(--line)}
.hero-bg{position:absolute;inset:0;z-index:0;opacity:.9;pointer-events:none}
.hero-bg svg{width:100%;height:100%;display:block}
.hero-grid{
  position:relative;z-index:1;
  display:grid;grid-template-columns:minmax(0,1fr) 560px;gap:64px;align-items:start;
  padding:72px 28px 88px;
}
.hero-copy{padding-top:10px;max-width:620px}
.eyebrow{
  font-size:12px;letter-spacing:.18em;text-transform:uppercase;color:var(--accent);
  font-weight:700;margin-bottom:18px;
}
h1{
  font-family:var(--serif);font-size:clamp(54px,6.2vw,88px);line-height:1.06;
  letter-spacing:-.02em;margin:0 0 22px;font-weight:700;
}
h1 em{font-style:normal;color:var(--accent);position:relative;white-space:nowrap}
h1 em::after{
  content:"";position:absolute;left:0;right:0;bottom:4px;height:12px;
  background:rgba(14,95,82,.15);z-index:-1;
}
.hero-lead{font-size:19px;line-height:1.75;color:var(--muted);margin:0 0 24px;max-width:560px}
.hero-lead strong{color:var(--ink)}
.hero-points{list-style:none;margin:0 0 30px;padding:0;display:flex;flex-direction:column;gap:10px}
.hero-points li{display:flex;gap:12px;align-items:baseline;font-size:14px;color:var(--muted)}
.hero-points span{
  font-family:var(--mono);font-size:12px;color:var(--accent);letter-spacing:.04em;
  min-width:24px;
}
.hero-actions{display:flex;align-items:center;gap:22px;flex-wrap:wrap;margin-bottom:16px}
.hero-note{font-size:14px;color:var(--muted);margin:0;letter-spacing:.01em}

/* ---------- calculator ---------- */
.calc-wrap{min-width:0;scroll-margin-top:86px}
.calc-card{
  background:var(--paper);border:1px solid var(--line);box-shadow:var(--shadow);
  padding:24px 24px 22px;position:relative;
}
.calc-card::before{
  content:"";position:absolute;left:0;top:0;width:3px;height:62px;background:var(--accent);
}
.calc-head{display:flex;justify-content:space-between;align-items:flex-start;gap:14px;margin-bottom:18px}
.kicker{
  display:block;font-size:12px;letter-spacing:.16em;text-transform:uppercase;
  color:var(--accent);font-weight:700;margin-bottom:4px;
}
.calc-head h2,.section-head h2,.waitlist h2,.faq h2{
  font-family:var(--serif);font-size:30px;line-height:1.2;margin:0;letter-spacing:-.01em;
}
fieldset{border:none;padding:0;margin:0 0 16px}
legend{
  padding:0;margin:0 0 10px;font-size:14px;letter-spacing:.12em;text-transform:uppercase;
  color:var(--muted);font-weight:700;
}
fieldset{display:grid;grid-template-columns:1fr 1fr;gap:12px 14px}
fieldset legend{grid-column:1 / -1}
.field{display:flex;flex-direction:column;gap:5px;min-width:0}
.field.span-2{grid-column:span 2}
.field label{
  display:flex;justify-content:space-between;align-items:baseline;gap:8px;
  font-size:14px;color:#3a362e;font-weight:500;
}
.field label span{font-size:14px;color:var(--muted);font-weight:400;white-space:nowrap}
.field input,.field select{
  width:100%;height:42px;border:1px solid var(--line);background:#fff;
  color:var(--ink);font-family:var(--sans);font-size:15px;padding:0 11px;
  border-radius:2px;transition:border-color .15s,box-shadow .15s;
  appearance:none;-webkit-appearance:none;
}
.field select{
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%236f6a60' stroke-width='1.4' fill='none'/%3E%3C/svg%3E");
  background-repeat:no-repeat;background-position:right 11px center;padding-right:30px;
  cursor:pointer;
}
.field input:hover,.field select:hover{border-color:var(--line-strong)}
.field input:focus,.field select:focus{
  outline:none;border-color:var(--accent);box-shadow:0 0 0 3px rgba(14,95,82,.12);
}
.field-help{margin:0;font-size:14px;color:var(--muted);line-height:1.5}
.calc-actions{display:flex;flex-direction:column;gap:8px;margin-top:4px}
.calc-hint{font-size:14px;color:var(--muted);text-align:center}
.calc-error{
  margin:12px 0 0;padding:10px 12px;background:var(--danger-soft);color:var(--danger);
  font-size:14px;border-left:3px solid var(--danger);
}
.calc-footnote{font-size:14px;color:var(--muted);margin:10px 0 0;line-height:1.6}

/* ---------- result ---------- */
.result-section{
  background:#efece3;border-bottom:1px solid var(--line);padding:64px 0 72px;
  scroll-margin-top:86px;animation:fadeUp .45s ease both;
}
@keyframes fadeUp{from{opacity:0;transform:translateY(10px)}to{opacity:1;transform:none}}
.section-head{display:flex;justify-content:space-between;align-items:flex-end;gap:32px;margin-bottom:26px}
.section-head h2{font-size:38px}
.section-lead{max-width:430px;margin:0;font-size:15px;color:var(--muted);line-height:1.7}
.result-summary{margin:0;font-size:14px;color:var(--muted);text-align:right;max-width:520px}
.result-summary b{color:var(--ink);font-weight:600}
.term-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(210px,1fr));gap:14px;margin-bottom:18px}
.term-card{
  appearance:none;-webkit-appearance:none;text-align:left;cursor:pointer;
  background:var(--paper);border:1px solid var(--line);padding:18px 18px 16px;
  font-family:var(--sans);color:var(--ink);position:relative;transition:.18s;
}
.term-card:hover{border-color:var(--line-strong);transform:translateY(-1px)}
.term-card:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
.term-card.is-selected{border-color:var(--accent);background:var(--accent-soft);box-shadow:0 0 0 1px var(--accent) inset}
.term-card.is-selected::after{
  content:"已选";position:absolute;top:12px;right:12px;font-size:11px;letter-spacing:.08em;
  color:var(--accent);font-weight:700;
}
.term-name{display:block;font-family:var(--mono);font-size:14px;letter-spacing:.1em;color:var(--accent);font-weight:700}
.term-sub{display:block;font-size:14px;color:var(--muted);margin-top:2px}
.term-price{display:block;font-family:var(--serif);font-size:32px;line-height:1.15;margin:12px 0 2px;letter-spacing:-.02em}
.term-unit{display:block;font-size:14px;color:var(--muted)}
.term-profit{display:block;font-size:14px;color:var(--ink);margin-top:10px;padding-top:10px;border-top:1px solid var(--line)}
.term-profit strong{color:var(--accent);font-weight:700}
.result-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:18px;align-items:start}
.panel{background:var(--paper);border:1px solid var(--line);padding:22px 22px 20px;min-width:0}
.panel-head{display:flex;justify-content:space-between;align-items:baseline;gap:12px;margin-bottom:14px}
.panel-head h3{font-size:17px;margin:0}
.panel-meta{font-size:14px;color:var(--muted);text-align:right}
.breakdown{display:flex;flex-direction:column;gap:9px}
.breakdown-row{display:grid;grid-template-columns:110px minmax(0,1fr) 94px;gap:10px;align-items:center;font-size:14px}
.breakdown-row .bl{color:var(--muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.breakdown-row .btrack{height:6px;background:#e9e3d6;position:relative;overflow:hidden}
.breakdown-row .bfill{height:100%;background:var(--accent);width:0;transition:width .5s ease}
.breakdown-row .bv{text-align:right;font-variant-numeric:tabular-nums;white-space:nowrap}
.breakdown-row.is-rebate .bfill{background:var(--warn)}
.breakdown-row.is-rebate .bv{color:var(--warn)}
.breakdown-total{
  display:flex;justify-content:space-between;gap:12px;margin-top:14px;padding-top:12px;
  border-top:1px solid var(--line);font-size:14px;
}
.breakdown-total b{font-family:var(--serif);font-size:20px;letter-spacing:-.01em}
.table-wrap{overflow-x:auto}
.sensitivity-table{width:100%;border-collapse:collapse;font-size:14px;min-width:320px}
.sensitivity-table th,.sensitivity-table td{padding:9px 8px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}
.sensitivity-table th{font-size:14px;letter-spacing:.04em;color:var(--muted);font-weight:600;background:#f4f0e6}
.sensitivity-table td.num,.sensitivity-table th.num{text-align:right;white-space:nowrap;font-variant-numeric:tabular-nums}
.sensitivity-table tr:last-child td{border-bottom:none}
.sensitivity-table .detail{display:block;font-size:14px;color:var(--muted);margin-top:2px}
.negative{color:var(--danger)}
.positive{color:var(--accent)}
.warning-panel{border-left:3px solid var(--warn);background:var(--warn-soft);margin-top:18px}
.warning-list{margin:0;padding-left:18px;font-size:14px;line-height:1.75}
.warning-list li{margin-bottom:4px}
.assumptions{margin-top:18px;padding:0 2px}
.assumptions h4{font-size:14px;margin:0 0 6px;color:var(--muted);font-weight:600}
.assumptions ul{margin:0;padding-left:18px;font-size:14px;color:var(--muted);line-height:1.7;columns:2;column-gap:28px}
.assumptions li{break-inside:avoid;margin-bottom:2px}

/* ---------- sections ---------- */
.section{padding:76px 0;border-bottom:1px solid var(--line)}
.why{background:var(--bg)}
.incoterms{background:var(--paper)}
.mistakes{background:var(--bg)}
.faq{background:var(--paper);border-bottom:none}
.why-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}
.why-card{background:var(--paper);border:1px solid var(--line);padding:22px 22px 20px;position:relative}
.why-card b{
  display:block;font-family:var(--serif);font-size:34px;line-height:1;color:var(--accent);
  margin-bottom:14px;letter-spacing:-.02em;
}
.why-card h3{font-size:16px;margin:0 0 8px}
.why-card p{margin:0;font-size:14px;color:var(--muted);line-height:1.7}
.incoterm-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}
.incoterm-card{background:var(--bg);border:1px solid var(--line);padding:22px 22px 20px}
.incoterm-top{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-bottom:8px}
.incoterm-top .code{font-family:var(--serif);font-size:30px;letter-spacing:-.01em;color:var(--accent);font-weight:700}
.incoterm-top .tag{font-size:11px;letter-spacing:.08em;text-transform:uppercase;color:var(--muted);border:1px solid var(--line);padding:2px 7px}
.incoterm-card h3{font-size:16px;margin:0 0 8px}
.incoterm-card p{margin:0;font-size:14px;color:var(--muted);line-height:1.7}
.incoterm-card dl{display:grid;grid-template-columns:auto 1fr;gap:4px 12px;margin:16px 0 0;padding-top:12px;border-top:1px solid var(--line);font-size:14px}
.incoterm-card dt{color:var(--muted)}
.incoterm-card dd{margin:0;color:var(--ink)}
.mistake-list{list-style:none;counter-reset:m;margin:0;padding:0;display:grid;grid-template-columns:1fr 1fr;gap:0 40px}
.mistake-list li{counter-increment:m;position:relative;padding:18px 0 18px 50px;border-top:1px solid var(--line);font-size:14px}
.mistake-list li::before{
  content:counter(m,decimal-leading-zero);position:absolute;left:0;top:18px;
  font-family:var(--mono);font-size:13px;color:var(--accent);letter-spacing:.04em;
}
.mistake-list b{display:block;font-size:15px;margin-bottom:4px}
.mistake-list span{display:block;color:var(--muted);line-height:1.7}

/* ---------- trust ---------- */
.trust{background:var(--bg);border-bottom:1px solid var(--line)}
.trust-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:1px;background:var(--line);border:1px solid var(--line)}
.trust-card{background:var(--paper);padding:22px 22px 20px}
.trust-card b{display:block;font-family:var(--mono);font-size:12px;letter-spacing:.08em;color:var(--accent);margin-bottom:8px}
.trust-card h3{font-size:16px;margin:0 0 6px}
.trust-card p{margin:0;font-size:14px;color:var(--muted);line-height:1.7}

/* ---------- pricing ---------- */
.pricing{background:var(--paper);border-bottom:1px solid var(--line)}
.pricing-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}
.price-card{background:var(--bg);border:1px solid var(--line);padding:24px 22px 22px;display:flex;flex-direction:column}
.price-card.featured{border-color:var(--accent);background:linear-gradient(180deg,#fffdf8,#f1f7f4);box-shadow:var(--shadow)}
.price-top{display:flex;justify-content:space-between;align-items:baseline;gap:10px}
.price-top h3{font-family:var(--serif);font-size:26px;margin:0;line-height:1.2}
.price-tag{font-size:11px;letter-spacing:.06em;text-transform:uppercase;color:var(--accent);border:1px solid rgba(14,95,82,.25);padding:2px 7px;white-space:nowrap}
.price{font-family:var(--serif);font-size:38px;line-height:1.1;letter-spacing:-.02em;margin:14px 0 2px}
.price small{font-family:var(--sans);font-size:16px;color:var(--muted);margin-right:2px}
.price span{font-family:var(--sans);font-size:14px;color:var(--muted);margin-left:2px}
.price-desc{font-size:14px;color:var(--muted);line-height:1.6;margin:0 0 14px;min-height:44px}
.price-card ul{list-style:none;margin:0 0 20px;padding:14px 0 0;border-top:1px solid var(--line);font-size:14px;line-height:1.9;color:#3a362e;flex:1}
.price-card li::before{content:"·";color:var(--accent);font-weight:700;margin-right:7px}
.price-note{font-size:14px;color:var(--muted);margin:16px 0 0;text-align:center}

/* ---------- waitlist ---------- */
.waitlist{
  background:
    radial-gradient(800px 420px at 90% 0%,rgba(163,196,183,.16),transparent 60%),
    radial-gradient(700px 380px at 0% 100%,rgba(180,83,9,.12),transparent 60%),
    var(--accent-dark);
  color:#f5f1e8;padding:76px 0;border-bottom:1px solid #062b26;
}
.waitlist-grid{display:grid;grid-template-columns:1fr 440px;gap:64px;align-items:start}
.kicker.light{color:#a9cbbf}
.waitlist h2{color:#fbf7ee;font-size:40px;margin-bottom:16px}
.waitlist-lead{font-size:15px;line-height:1.8;color:#c8d6cf;max-width:540px;margin:0 0 20px}
.waitlist-points{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:8px;font-size:14px;color:#c8d6cf}
.waitlist-points li{position:relative;padding-left:18px}
.waitlist-points li::before{content:"";position:absolute;left:0;top:9px;width:7px;height:7px;background:#a9cbbf;border-radius:50%}
.waitlist-card{background:var(--paper);color:var(--ink);padding:24px;border:1px solid rgba(255,255,255,.18);box-shadow:0 24px 50px -30px rgba(0,0,0,.6)}
.waitlist-card .field{margin-bottom:12px}
.waitlist-card .btn{margin-top:4px}
.form-note{font-size:14px;color:var(--muted);line-height:1.6;margin:10px 0 0;text-align:center}
.form-status{margin:12px 0 0;padding:12px 14px;font-size:14px;line-height:1.65;border-left:3px solid var(--accent);background:var(--accent-soft);color:var(--accent-dark)}
.form-status strong{display:block;font-size:16px;margin-bottom:2px;color:var(--accent-dark)}
.form-status.error{border-left-color:var(--danger);background:var(--danger-soft);color:var(--danger)}
.form-status.error strong{color:var(--danger)}

/* ---------- faq ---------- */
.faq-grid{display:grid;grid-template-columns:.8fr 1.2fr;gap:64px;align-items:start}
.faq-list{border-top:1px solid var(--line)}
.faq-list details{border-bottom:1px solid var(--line);padding:18px 0}
.faq-list summary{
  list-style:none;cursor:pointer;font-size:16px;font-weight:600;display:flex;
  justify-content:space-between;gap:18px;align-items:center;
}
.faq-list summary::-webkit-details-marker{display:none}
.faq-list summary::after{content:"+";font-family:var(--mono);font-size:20px;color:var(--accent);line-height:1}
.faq-list details[open] summary::after{content:"−"}
.faq-list details p{margin:12px 0 0;font-size:14px;color:var(--muted);line-height:1.75;max-width:680px}

/* ---------- footer ---------- */
.site-footer{background:#ece8de;padding:46px 0 52px;border-top:1px solid var(--line)}
.footer-grid{display:grid;grid-template-columns:1.2fr .7fr .7fr;gap:40px;align-items:start}
.footer-brand{margin-bottom:10px}
.footer-grid p{margin:0;font-size:14px;color:var(--muted);line-height:1.7}
.footer-links{display:flex;flex-direction:column;gap:8px;font-size:14px;color:var(--muted)}
.footer-links a:hover{color:var(--accent)}
.footer-legal{text-align:right}
.footer-legal p+p{margin-top:6px}

/* ---------- responsive ---------- */
@media (max-width:1080px){
  .hero-grid{grid-template-columns:1fr;gap:36px;padding-top:54px}
  .hero-copy{max-width:760px}
  .calc-wrap{max-width:640px}
  .result-grid{grid-template-columns:1fr}
  .waitlist-grid{grid-template-columns:1fr;gap:36px}
  .waitlist-card{max-width:640px}
  .faq-grid{grid-template-columns:1fr;gap:28px}
  .footer-grid{grid-template-columns:1fr 1fr;gap:28px}
  .footer-legal{grid-column:1 / -1;text-align:left}
  .pricing-grid{grid-template-columns:1fr}
  .trust-grid{grid-template-columns:1fr 1fr}
}
@media (max-width:860px){
  .nav-links{display:none}
  .hero-grid{padding-top:42px;padding-bottom:64px}
  .why-grid,.incoterm-grid{grid-template-columns:1fr}
  .mistake-list{grid-template-columns:1fr}
  .term-grid{grid-template-columns:1fr}
  .section-head{flex-direction:column;align-items:flex-start;gap:12px}
  .result-summary{text-align:left}
  .section-head h2{font-size:32px}
  .waitlist h2{font-size:34px}
  .assumptions ul{columns:1}
}
@media (max-width:720px){
  .container{padding-left:20px;padding-right:20px}
  .hero-grid{padding-left:20px;padding-right:20px}
  .nav{height:62px}
  .nav-cta.ghost{display:none}
  .brand-text em{display:none}
  h1{font-size:clamp(46px,12vw,64px)}
  .hero-lead{font-size:17px}
  .hero-actions{gap:14px}
  .trust-grid{grid-template-columns:1fr}
  .calc-card{padding:20px 18px 18px}
  .calc-head h2{font-size:26px}
  fieldset{grid-template-columns:1fr}
  .field.span-2{grid-column:span 1}
  .breakdown-row{grid-template-columns:88px minmax(0,1fr) 84px;font-size:14px}
  .panel{padding:18px 16px}
  .term-price{font-size:28px}
  .section{padding:56px 0}
  .waitlist{padding:56px 0}
  .waitlist h2{font-size:30px}
  .footer-grid{grid-template-columns:1fr}
  .site-footer{padding:36px 0 42px}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *{animation-duration:.01ms !important;transition-duration:.01ms !important}
}