:root{color-scheme:light;--bg:#f5f7fb;--surface:#fff;--surface-soft:#f8faff;--line:#dfe5ef;--line-strong:#cbd5e3;--text:#0f172a;--muted:#64748b;--primary:#635bff;--primary-dark:#4f46e5;--primary-soft:#eeedff;--success:#0f9f6e;--shadow:0 18px 50px rgba(15,23,42,.08);--radius:20px}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:radial-gradient(circle at 15% 0,rgba(99,91,255,.08),transparent 28%),var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Microsoft YaHei",sans-serif;line-height:1.6}
button,input,select{font:inherit}
button,a{-webkit-tap-highlight-color:transparent}
.tool-header{position:sticky;top:0;z-index:20;border-bottom:1px solid rgba(203,213,225,.78);background:rgba(255,255,255,.88);backdrop-filter:blur(16px)}
.tool-header-inner{max-width:1180px;height:72px;margin:0 auto;padding:0 24px;display:flex;align-items:center;justify-content:space-between;gap:24px}
.tool-brand{display:flex;align-items:center;gap:11px;color:var(--text);text-decoration:none}
.tool-brand-mark{display:grid;place-items:center;width:38px;height:38px;border-radius:12px;background:linear-gradient(145deg,#635bff,#7c6cff);color:#fff;font-weight:800;box-shadow:0 8px 18px rgba(99,91,255,.28)}
.tool-brand span:last-child{display:flex;flex-direction:column;line-height:1.18}
.tool-brand strong{font-size:16px}
.tool-brand small{margin-top:4px;color:var(--muted);font-size:11px;letter-spacing:.08em}
.tool-nav{display:flex;align-items:center;gap:6px}
.tool-nav>a,.tool-theme-toggle{padding:8px 11px;border:0;border-radius:9px;background:transparent;color:var(--muted);font-size:13px;text-decoration:none;cursor:pointer}
.tool-nav>a:hover,.tool-theme-toggle:hover{background:var(--surface-soft);color:var(--text)}
.tool-theme-toggle{display:inline-flex;align-items:center;gap:6px;border:1px solid var(--line)}
.tool-shell{max-width:1180px;margin:0 auto;padding:24px 24px 72px}
.tool-breadcrumb{display:flex;align-items:center;gap:9px;margin-bottom:20px;color:var(--muted);font-size:13px}
.tool-breadcrumb a{color:var(--primary-dark);text-decoration:none}
.tool-breadcrumb strong{color:var(--text)}
.tool-hero{position:relative;overflow:hidden;display:flex;align-items:center;justify-content:space-between;gap:32px;padding:42px 46px;border:1px solid #dcd9ff;border-radius:24px;background:linear-gradient(135deg,#fafaff 0,#f2f0ff 55%,#e8edff 100%);box-shadow:0 14px 45px rgba(99,91,255,.1)}
.tool-hero:after{content:"";position:absolute;right:-55px;bottom:-100px;width:280px;height:280px;border-radius:50%;background:radial-gradient(circle,rgba(99,91,255,.22),transparent 66%)}
.tool-eyebrow{display:block;margin-bottom:8px;color:var(--primary);font-size:11px;font-weight:800;letter-spacing:.16em}
.tool-hero h1{margin:0 0 10px;font-size:38px;line-height:1.25;letter-spacing:-.03em}
.tool-hero p{max-width:690px;margin:0;color:#526078;font-size:16px}
.tool-hero-badge{position:relative;z-index:1;flex:0 0 160px;padding:20px;border:1px solid rgba(255,255,255,.7);border-radius:18px;background:rgba(255,255,255,.72);box-shadow:0 12px 28px rgba(57,48,175,.1);text-align:center}
.tool-hero-badge span,.tool-hero-badge small{display:block;color:var(--muted);font-size:11px}
.tool-hero-badge strong{display:block;margin:5px 0 3px;color:var(--primary-dark);font-size:19px}
.calculator-card,.tool-notes,.tool-faq{margin-top:24px;border:1px solid var(--line);border-radius:var(--radius);background:var(--surface);box-shadow:var(--shadow)}
.calculator-card{padding:30px}
.calculator-heading,.calculator-heading>div,.notes-heading{display:flex;align-items:center;justify-content:space-between;gap:18px}
.calculator-heading>div{justify-content:flex-start}
.calculator-icon{display:grid;place-items:center;width:50px;height:50px;border-radius:15px;background:var(--primary);color:#fff;font-size:14px;font-weight:850;box-shadow:0 10px 24px rgba(99,91,255,.26)}
.calculator-heading h2,.notes-heading h2{margin:0;font-size:21px}
.calculator-heading p{margin:2px 0 0;color:var(--muted);font-size:13px}
.calculator-scope{padding:7px 11px;border-radius:999px;background:#ecfdf5;color:#047857;font-size:12px;font-weight:700}
.mode-switch{display:grid;grid-template-columns:1fr 1fr;margin:28px 0 24px;padding:5px;border-radius:13px;background:#f1f4f9}
.mode-switch button{padding:11px 16px;border:0;border-radius:10px;background:transparent;color:var(--muted);font-weight:700;cursor:pointer}
.mode-switch button.is-active{background:var(--surface);color:var(--primary-dark);box-shadow:0 3px 12px rgba(15,23,42,.08)}
.field-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:18px}
.field-group{display:flex;min-width:0;flex-direction:column;gap:7px}
.field-group>span:first-child{color:#334155;font-size:13px;font-weight:700}
.field-group select,.readonly-field,.amount-input-wrap{width:100%;height:48px;border:1px solid var(--line-strong);border-radius:11px;background:var(--surface);color:var(--text);outline:none}
.field-group select{padding:0 38px 0 13px}
.field-group select:focus,.amount-input-wrap:focus-within{border-color:var(--primary);box-shadow:0 0 0 3px rgba(99,91,255,.12)}
.readonly-field{display:flex;align-items:center;gap:10px;padding:0 13px;color:#334155}
.readonly-field b{display:grid;place-items:center;width:27px;height:21px;border-radius:5px;background:#ef4444;color:#fff;font-size:10px}
.amount-field{grid-column:1/-1}
.country-fee-note{margin:11px 0 0;padding:9px 12px;border:1px solid #dcd9ff;border-radius:10px;background:#fafaff;color:var(--muted);font-size:11px}
.country-fee-note:before{content:"费率说明：";color:var(--primary-dark);font-weight:750}
.commercial-scope-note{display:flex;align-items:flex-start;gap:9px;margin:8px 0 0;padding:9px 12px;border:1px solid #dbe7f3;border-radius:10px;background:#f8fafc;color:var(--muted);font-size:11px}
.commercial-scope-note strong{flex:0 0 auto;color:#334155}
.amount-input-wrap{display:grid;grid-template-columns:auto 1fr auto;align-items:center;padding:0 14px}
.amount-input-wrap b{color:var(--primary-dark);font-size:18px}
.amount-input-wrap input{min-width:0;height:44px;padding:0 10px;border:0;background:transparent;color:var(--text);font-size:20px;font-weight:750;outline:0}
.amount-input-wrap em{color:var(--muted);font-size:12px;font-style:normal;font-weight:700}
.field-group small{color:var(--muted);font-size:11px}
.field-group .field-error{min-height:17px;color:#dc2626}
.form-actions{display:flex;justify-content:center;gap:12px;margin-top:20px}
.form-actions button,.copy-result{border-radius:10px;font-weight:700;cursor:pointer}
.primary-action{padding:11px 24px;border:1px solid var(--primary);background:var(--primary);color:#fff;box-shadow:0 8px 18px rgba(99,91,255,.22)}
.primary-action:hover{background:var(--primary-dark)}
.secondary-action{padding:11px 20px;border:1px solid var(--line-strong);background:var(--surface);color:#475569}
.result-panel{display:grid;grid-template-columns:minmax(240px,.85fr) minmax(0,1.7fr);gap:22px;margin-top:28px;padding:24px;border:1px solid #dcd9ff;border-radius:17px;background:linear-gradient(135deg,#fafaff,#f8faff)}
.result-primary{position:relative;padding-right:24px;border-right:1px solid var(--line)}
.result-primary>span{display:block;color:var(--muted);font-size:12px;font-weight:700}
.result-primary>strong{display:flex;align-items:baseline;gap:6px;margin-top:8px;color:var(--primary-dark)}
.result-primary>strong em{font-size:18px;font-style:normal}
.result-primary>strong b{font-size:36px;line-height:1.2}
.result-primary>strong small{color:var(--muted);font-size:11px}
.copy-result{margin-top:14px;padding:7px 11px;border:1px solid #d8d6ff;background:var(--primary-soft);color:var(--primary-dark);font-size:12px}
.result-metrics{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px;margin:0}
.result-metrics>div{padding:12px 14px;border:1px solid var(--line);border-radius:12px;background:var(--surface)}
.result-metrics dt{color:var(--muted);font-size:11px}
.result-metrics dd{overflow:hidden;margin:5px 0 0;color:var(--text);font-size:16px;font-weight:750;text-overflow:ellipsis;white-space:nowrap}
.formula-box{grid-column:2;margin-top:-9px;padding:12px 14px;border-radius:12px;background:#eef2ff}
.formula-box>div{display:flex;align-items:center;justify-content:space-between;gap:16px}
.formula-box span,.formula-box p{color:var(--muted);font-size:11px}
.formula-box strong{color:var(--primary-dark);font-size:13px}
.formula-box p{margin:6px 0 0}
.tool-notes,.tool-faq{padding:30px}
.notes-heading{align-items:flex-end;margin-bottom:20px}
.notes-heading a{color:var(--primary-dark);font-size:13px;font-weight:700;text-decoration:none}
.rule-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}
.rule-grid article{position:relative;padding:20px 20px 20px 58px;border:1px solid var(--line);border-radius:14px;background:var(--surface-soft)}
.rule-grid article>span{position:absolute;top:18px;left:18px;color:var(--primary);font-size:12px;font-weight:850}
.rule-grid h3{margin:0 0 7px;font-size:15px}
.rule-grid p{margin:0;color:var(--muted);font-size:13px}
.source-strip{display:flex;flex-wrap:wrap;align-items:center;gap:10px;margin-top:16px;padding:13px 16px;border-radius:12px;background:#f8fafc;color:var(--muted);font-size:12px}
.source-strip strong{color:var(--text)}
.source-strip a{color:var(--primary-dark);text-decoration:none}
.source-strip span{margin-left:auto}
.tool-faq details{border-top:1px solid var(--line)}
.tool-faq details:first-of-type{border-top:0}
.tool-faq summary{padding:17px 2px;color:var(--text);font-weight:700;cursor:pointer}
.tool-faq details p{margin:-5px 0 18px;color:var(--muted);font-size:13px}
.tool-footer{margin-top:16px;padding:36px 24px;border-top:1px solid var(--line);background:#111827;color:#cbd5e1;text-align:center}
.tool-footer>div{display:flex;justify-content:center;gap:10px}
.tool-footer strong{color:#fff}
.tool-footer span{color:#94a3b8}
.tool-footer nav{display:flex;justify-content:center;gap:18px;margin:15px 0}
.tool-footer a{color:#cbd5e1;font-size:12px;text-decoration:none}
.tool-footer p{margin:0;color:#64748b;font-size:11px}
html.portal-dark{color-scheme:dark;--bg:#09111f;--surface:#101b2f;--surface-soft:#0d1729;--line:#293a55;--line-strong:#39506f;--text:#f5f8ff;--muted:#93a4bd;--primary:#8b82ff;--primary-dark:#a59fff;--primary-soft:#252654;--success:#34d399;--shadow:0 18px 50px rgba(0,0,0,.28)}
html.portal-dark body{background:radial-gradient(circle at 15% 0,rgba(99,91,255,.16),transparent 28%),var(--bg)}
html.portal-dark .tool-header{border-color:var(--line);background:rgba(9,17,31,.88)}
html.portal-dark .tool-hero{border-color:#373967;background:linear-gradient(135deg,#151b36,#17203b 58%,#20254d)}
html.portal-dark .tool-hero p{color:var(--muted)}
html.portal-dark .tool-hero-badge{border-color:#3b4266;background:rgba(16,27,47,.8)}
html.portal-dark .calculator-scope{background:#11372f;color:#6ee7b7}
html.portal-dark .mode-switch{background:#0b1424}
html.portal-dark .mode-switch button.is-active{background:#18243a}
html.portal-dark .field-group>span:first-child,html.portal-dark .readonly-field{color:#cbd5e1}
html.portal-dark .result-panel{border-color:#373967;background:linear-gradient(135deg,#151a34,#111d31)}
html.portal-dark .country-fee-note{border-color:#373967;background:#111a31}
html.portal-dark .commercial-scope-note{border-color:var(--line);background:#0b1424}
html.portal-dark .commercial-scope-note strong{color:#dbe7f5}
html.portal-dark .formula-box{background:#1d2450}
html.portal-dark .source-strip{background:#0b1424}
html.portal-dark .tool-footer{background:#060b14}
@media(max-width:800px){.tool-header-inner{height:auto;min-height:64px;padding:10px 16px}
.tool-brand small,.tool-nav>a:nth-child(2),.tool-nav>a:nth-child(3),.portal-theme-toggle-label{display:none}
.tool-nav{gap:2px}
.tool-theme-toggle{width:38px;justify-content:center}
.tool-shell{padding:18px 14px 52px}
.tool-breadcrumb{overflow:hidden;white-space:nowrap}
.tool-hero{align-items:flex-start;padding:30px 24px}
.tool-hero h1{font-size:30px}
.tool-hero p{font-size:14px}
.tool-hero-badge{flex-basis:138px;padding:15px}
.calculator-card,.tool-notes,.tool-faq{padding:21px}
.field-grid{grid-template-columns:1fr 1fr}
.field-group:first-child{grid-column:1/-1}
.result-panel{grid-template-columns:1fr}
.result-primary{padding:0 0 20px;border-right:0;border-bottom:1px solid var(--line)}
.formula-box{grid-column:1;margin-top:0}
.rule-grid{grid-template-columns:1fr}
.source-strip span{width:100%;margin-left:0}
}
@media(max-width:560px){.tool-brand strong{font-size:14px}
.tool-nav>a:first-child{display:none}
.tool-breadcrumb{font-size:11px}
.tool-hero{display:block;padding:25px 20px}
.tool-hero h1{font-size:27px}
.tool-hero-badge{display:flex;align-items:center;gap:8px;margin-top:18px;padding:11px 13px;text-align:left}
.tool-hero-badge span,.tool-hero-badge small{display:inline}
.tool-hero-badge strong{margin:0;font-size:15px}
.calculator-heading{align-items:flex-start}
.calculator-scope{display:none}
.mode-switch{grid-template-columns:1fr;margin-top:22px}
.mode-switch button{font-size:12px}
.field-grid{grid-template-columns:1fr}
.field-group:first-child{grid-column:auto}
.amount-field{grid-column:auto}
.form-actions{display:grid;grid-template-columns:1fr 1fr}
.form-actions button{padding:10px 12px}
.result-panel{padding:18px}
.result-metrics{grid-template-columns:1fr}
.result-primary>strong b{font-size:32px}
.formula-box>div{align-items:flex-start;flex-direction:column;gap:3px}
.calculator-card,.tool-notes,.tool-faq{border-radius:16px}
.notes-heading{align-items:flex-start;flex-direction:column}
.rule-grid article{padding:18px 17px 18px 49px}
.source-strip{align-items:flex-start;flex-direction:column}
.tool-footer>div{flex-direction:column;gap:2px}
.tool-footer nav{flex-wrap:wrap}
}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}
*{transition:none!important}
}