:root{
--bg:#f3f4ef; --card:#ffffff; --card2:#eef3ee; --ink:#17251f; --muted:#5c6b63; --line:#dde3da;
--green:#0d7a5f; --green-dark:#095c47; --green-soft:#e0f2ea;
--orange:#e85d04; --orange-soft:#fff0e2; --amber:#8a5a00; --amber-bg:#fff4cf;
--red:#b42318; --red-bg:#feecea; --blue:#175cd3; --blue-bg:#eaf1fe;
--shadow:0 6px 24px rgba(20,40,30,.07); --radius:18px;
}
@media (prefers-color-scheme: dark){
:root{--bg:#121714; --card:#1c2420; --card2:#222c27; --ink:#edf3ee; --muted:#a7b3ab; --line:#334038;
--green:#2ec4a0; --green-dark:#2ec4a0; --green-soft:#17382f; --orange:#ff8a3d; --orange-soft:#3a2718;
--amber:#ffd166; --amber-bg:#3a3012; --red:#ff8a80; --red-bg:#3d1f1c; --blue:#8ab4ff; --blue-bg:#1d2f4a; --shadow:none;}
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--ink);font-family:system-ui,-apple-system,"PingFang SC","Microsoft YaHei",sans-serif;line-height:1.55}
a{color:var(--green)}
.wrap{max-width:1080px;margin:0 auto;padding:18px 16px 40px}
.num{font-family:system-ui,sans-serif;letter-spacing:-.02em}

/* top notice */
.notice{background:var(--amber-bg);border:1px solid rgba(180,130,0,.35);border-radius:14px;padding:12px 14px;font-size:13.5px;color:var(--ink);display:flex;gap:10px;align-items:flex-start}
.notice b{color:var(--amber);white-space:nowrap}
.hero{padding:22px 2px 6px}
.hero h1{font-size:clamp(28px,6vw,46px);line-height:1.12;margin:0 0 10px;font-weight:900;letter-spacing:-.02em}
.hero h1 em{font-style:normal;color:var(--green)}
.hero p{margin:0;color:var(--muted);font-size:16px;max-width:680px}
.hero-meta{display:flex;flex-wrap:wrap;gap:8px;margin-top:14px}
.pill{font-size:12.5px;font-weight:700;padding:6px 11px;border-radius:999px;background:var(--card);border:1px solid var(--line)}
.pill.hot{background:var(--green);color:#fff;border-color:var(--green)}
.next-step{margin-top:16px;background:var(--ink);color:#fff;border-radius:var(--radius);padding:16px 18px;display:grid;grid-template-columns:auto 1fr auto;gap:14px;align-items:center}
@media(prefers-color-scheme:dark){.next-step{background:#e8f0e9;color:#14211b}}
.next-step .stepno{width:44px;height:44px;min-width:44px;border-radius:50%;background:#e85d04;color:#fff;display:grid;place-items:center;font-weight:900;font-size:19px;flex:none}
.next-step h2{margin:0 0 2px;font-size:16px}
.next-step p{margin:0;font-size:13.5px;opacity:.85}
.next-step .arr{font-size:22px;opacity:.6}
@media(max-width:560px){.next-step{display:flex;flex-direction:column;align-items:flex-start;gap:10px}.next-step .arr{display:none!important}.next-step .stepno{width:40px;height:40px;min-width:40px}}

section{margin-top:34px}
.sec-head{display:flex;align-items:baseline;justify-content:space-between;gap:12px;flex-wrap:wrap;margin-bottom:6px}
.sec-head h2{font-size:22px;margin:0;font-weight:900}
.sec-head .no{color:var(--orange);font-family:sans-serif;margin-right:6px}
.sec-sub{color:var(--muted);font-size:14px;margin:0 0 16px}

/* product cards */
.products{display:flex;flex-direction:column;gap:14px}
.prod{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:18px;scroll-margin-top:16px}
.prod.is-main{border:2px solid var(--green)}
.prod-top{display:flex;justify-content:space-between;gap:12px;align-items:flex-start;flex-wrap:wrap}
.prod h3{margin:0;font-size:19px;font-weight:900}
.prod h3 .rank{color:var(--muted);font-weight:700;margin-right:6px}
.tag{font-size:12px;font-weight:800;padding:5px 10px;border-radius:999px;white-space:nowrap}
.tag-main{background:var(--green);color:#fff}.tag-watch{background:var(--blue-bg);color:var(--blue)}
.tag-alt{background:var(--green-soft);color:var(--green-dark)}.tag-low{background:var(--card2);color:var(--muted)}
.tag-drop{background:var(--red-bg);color:var(--red)}
.price-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin:14px 0}
@media(max-width:640px){.price-grid{grid-template-columns:1fr}}
.pbox{background:var(--card2);border-radius:12px;padding:11px 13px}
.pbox .lab{font-size:11.5px;font-weight:800;letter-spacing:.04em;color:var(--muted);text-transform:uppercase}
.pbox .val{font-size:16.5px;font-weight:900;margin:2px 0}
.pbox .val .cur{color:var(--orange)}
.pbox .detail{font-size:12.5px;color:var(--muted)}
.floor{display:flex;gap:8px;align-items:center;background:var(--orange-soft);border-radius:10px;padding:9px 12px;font-size:13.5px;font-weight:700}
.floor b{color:var(--orange);font-size:16px}
.prod-meta{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-top:10px;font-size:13.5px}
@media(max-width:640px){.prod-meta{grid-template-columns:1fr}}
.prod-meta div b{display:block;font-size:12px;color:var(--muted);margin-bottom:2px}
.risk{color:var(--ink)}
.load-btn{margin-top:14px;width:100%;min-height:48px;border:0;border-radius:12px;background:var(--green);color:#fff;font-size:15.5px;font-weight:800;cursor:pointer;font-family:inherit}
.load-btn:active{transform:scale(.99)}
.load-btn.ghost{background:var(--card2);color:var(--ink);border:1px solid var(--line)}

/* calculator */
.calc{background:var(--card);border:1px solid var(--line);border-radius:20px;box-shadow:var(--shadow);overflow:hidden}
.tabs{display:grid;grid-template-columns:1fr 1fr;background:var(--card2);padding:6px;gap:6px}
.tab{border:0;background:transparent;padding:12px 8px;border-radius:12px;font-family:inherit;font-size:15px;font-weight:800;color:var(--muted);cursor:pointer}
.tab[aria-selected="true"]{background:var(--card);color:var(--ink);box-shadow:0 2px 10px rgba(0,0,0,.08)}
.tab small{display:block;font-weight:500;font-size:12px;margin-top:1px}
.calc-body{padding:18px}
.warn{border-radius:12px;padding:12px 14px;font-size:14px;margin-bottom:16px}
.warn-orange{background:var(--orange-soft);border:1px solid rgba(232,93,4,.3)}
.warn-orange b{color:var(--orange)}
.current-prod{font-size:13.5px;color:var(--muted);margin-bottom:12px}
.current-prod b{color:var(--ink);font-size:15px}
.formula{font-size:13px;background:var(--card2);border-radius:10px;padding:10px 12px;color:var(--muted);margin-bottom:16px}
.formula b{color:var(--ink)}
.fgrid{display:grid;grid-template-columns:1fr 1fr;gap:12px}
@media(max-width:560px){.fgrid{grid-template-columns:1fr 1fr}}
@media(max-width:380px){.fgrid{grid-template-columns:1fr}}
.field label{display:block;font-size:13px;font-weight:700;margin-bottom:5px}
.field label span{color:var(--muted);font-weight:500}
.field .hint{font-size:11.5px;color:var(--muted);margin-top:4px}
.input-wrap{display:flex;align-items:center;border:1.5px solid var(--line);border-radius:12px;background:var(--bg);overflow:hidden}
.input-wrap:focus-within{border-color:var(--green)}
.input-wrap .pre,.input-wrap .suf{padding:0 10px;color:var(--muted);font-weight:700;font-size:14px;flex:none}
.input-wrap input{border:0;background:transparent;width:100%;min-height:48px;font-size:17px;font-weight:700;color:var(--ink);font-family:inherit;outline:none;padding:8px 2px;min-width:0}
.result{margin-top:18px;border-radius:16px;padding:16px;background:var(--green-soft);border:1px solid rgba(13,122,95,.25)}
.result.loss{background:var(--red-bg);border-color:rgba(180,35,24,.3)}
.result-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
@media(max-width:640px){.result-grid{grid-template-columns:1fr}}
.rbox .lab{font-size:12px;font-weight:800;color:var(--muted)}
.rbox .big{font-size:30px;font-weight:900;line-height:1.15}
.rbox .sub{font-size:12.5px;color:var(--muted)}
.verdict{margin-top:12px;font-size:14.5px;font-weight:800}
.breakdown{margin-top:12px;font-size:13.5px;color:var(--muted);border-top:1px dashed var(--line);padding-top:10px}
.copy-btn{margin-top:14px;background:var(--ink);color:#fff;border:0;border-radius:10px;padding:11px 16px;font-family:inherit;font-weight:700;font-size:14px;cursor:pointer}
@media(prefers-color-scheme:dark){.copy-btn{background:#e8f0e9;color:#14211b}}
.hidden{display:none!important}

/* checklist */
.check-card{background:var(--card);border:1px solid var(--line);border-radius:20px;box-shadow:var(--shadow);padding:18px}
.score-row{display:flex;align-items:center;gap:16px;margin-bottom:16px;flex-wrap:wrap}
.score-big{font-size:40px;font-weight:900;line-height:1}
.score-big small{font-size:18px;color:var(--muted)}
.bar{flex:1;min-width:160px;height:12px;background:var(--card2);border-radius:999px;overflow:hidden}
.bar i{display:block;height:100%;width:0;background:var(--green);border-radius:999px;transition:width.3s}
.score-msg{font-size:14px;font-weight:700}
.check-list{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:8px}
.check-list li{display:flex;gap:12px;align-items:flex-start;padding:13px 14px;border:1.5px solid var(--line);border-radius:12px;cursor:pointer;transition:.15s}
.check-list li.done{border-color:var(--green);background:var(--green-soft)}
.check-list input{width:22px;height:22px;accent-color:var(--green);flex:none;margin:1px 0 0;cursor:pointer}
.check-list .q{font-size:15px;font-weight:600}
.check-list .why{font-size:12.5px;color:var(--muted);display:block;margin-top:1px}

/* steps */
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
@media(max-width:720px){.steps{grid-template-columns:1fr}}
.step{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:16px}
.step .n{width:30px;height:30px;border-radius:50%;background:var(--orange);color:#fff;display:grid;place-items:center;font-weight:900;margin-bottom:8px}
.step h3{margin:0 0 4px;font-size:15.5px}
.step p{margin:0;font-size:13.5px;color:var(--muted)}
.step.dont{border-color:rgba(180,35,24,.4);background:var(--red-bg)}
footer{margin-top:36px;border-top:1px solid var(--line);padding-top:18px;font-size:13px;color:var(--muted)}
footer.repeat{background:var(--amber-bg);border-radius:12px;padding:12px 14px;color:var(--ink);margin-bottom:12px}
.toast{position:fixed;left:50%;bottom:22px;transform:translate(-50%,80px);background:#17251f;color:#fff;padding:12px 18px;border-radius:999px;font-size:14px;font-weight:700;transition:.3s;z-index:50;box-shadow:0 10px 30px rgba(0,0,0,.25);max-width:92vw;text-align:center}
.toast.show{transform:translate(-50%,0)}
@media(prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}

[hidden]{display:none!important} :focus-visible{outline:3px solid var(--blue);outline-offset:4px} .hero .next-step p{color:inherit} .skip{position:absolute;top:-100px;left:16px;background:var(--card);padding:12px;z-index:99}.skip:focus{top:12px}.nav,.actions{display:flex;flex-wrap:wrap;gap:10px;margin:16px 0}.nav a{padding:9px 14px;border:1px solid var(--line);background:var(--card);border-radius:10px;text-decoration:none;font-weight:700}.actions button,.file-label,.scenario-button{font:inherit;cursor:pointer;padding:10px 14px;min-height:44px;border:1px solid var(--line);border-radius:10px;background:var(--card2);color:var(--ink)}.actions .primary{background:var(--green);color:#fff;border-color:var(--green)}.field>input,.field select,.field textarea{font:inherit;width:100%;padding:12px;border:1.5px solid var(--line);border-radius:12px;background:var(--bg);color:var(--ink);min-height:48px}.field.full{grid-column:1/-1}.field-error,.error{color:var(--red);font-size:14px}.error{padding:12px;background:var(--red-bg);border-radius:10px;margin-top:14px}.input-wrap:has([aria-invalid=true]){border-color:var(--red)}.input-wrap .pre,.input-wrap .suf{padding:0 10px}button:disabled{opacity:.5;cursor:not-allowed}.storage{font-size:13px;color:var(--muted)}.scenario-list{display:flex;flex-wrap:wrap;gap:8px}.scenario-list:empty::after{content:'还没有保存方案。核对参数后，点「保存为新方案」。';color:var(--muted)}details.examples>summary{cursor:pointer;padding:16px;border:1px solid var(--line);border-radius:12px;margin-bottom:14px;background:var(--card);font-weight:700}.check-list li{padding:0}.check-list label{display:flex;gap:12px;padding:13px 14px;width:100%;cursor:pointer}.check-list .why{display:block}.progress{width:100%;height:12px;accent-color:var(--green)}.result-grid .big{overflow-wrap:anywhere}.file-label input{max-width:200px;display:block;font-size:12px}.hint{color:var(--muted);font-size:12px;margin-top:4px}dialog{width:min(600px,94vw);border:1px solid var(--line);border-radius:18px;background:var(--card);color:var(--ink);padding:24px}dialog::backdrop{background:#0008}dialog textarea{width:100%;min-height:280px;background:var(--bg);color:var(--ink);padding:12px;font:inherit}.prod .floor{align-items:flex-start;flex-wrap:wrap}.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip-path:inset(50%)}.calc{scroll-margin-top:16px}@media(prefers-color-scheme:dark){.pill.hot,.tag-main,.load-btn,.actions .primary{background:#095c47;color:#fff;border-color:#095c47}}@media print{.nav,.actions,.load-btn,.copy-btn,footer,details.examples{display:none!important}.calc{box-shadow:none}body{background:white;color:black}.wrap{max-width:none}}
.scenario-list{display:grid;gap:12px}.scenario-card{display:flex;flex-wrap:wrap;gap:8px;padding:12px;border:1px solid var(--line);border-radius:14px;background:var(--card)}.scenario-card .scenario-button{flex:1;text-align:left;overflow-wrap:anywhere;min-width:0}.secondary-button{font:inherit;min-height:44px;padding:10px 14px;border:1px solid var(--line);border-radius:10px;background:var(--card);color:var(--muted);cursor:pointer}.scenario-trash{padding:14px;border:1px solid var(--line);border-radius:12px;background:var(--card)}.scenario-trash summary{cursor:pointer;min-height:30px;font-weight:700}.scenario-trash .scenario-button{display:block;text-align:left;width:100%;margin-top:10px;overflow-wrap:anywhere}.storage-error{color:var(--red);font-weight:700}.input-wrap{min-width:0}.field{min-width:0}