@import url('https://fonts.googleapis.com/css2?family=Prompt:wght@300;400;500;600;700&display=swap');

:root{--blue:#1735c8;--blue2:#3155eb;--navy:#091c37;--ink:#14213a;--muted:#6f7d94;--line:#dce3ef;--bg:#f4f7fc;--panel:#fff;--soft:#edf2ff;--cyan:#19b5ca;--coral:#ff694f;--green:#159a70;--shadow:0 18px 50px rgba(20,40,90,.1)}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--ink);font-family:"Prompt",system-ui,sans-serif;font-size:14px}
button,input,select{font:inherit}
button{cursor:pointer}
[hidden]{display:none!important}
.muted{color:var(--muted)}
.eyebrow{margin:0;color:#79dff0;font-size:11px;font-weight:700;letter-spacing:.2em}
.login-screen{min-height:100vh;display:grid;place-items:center;padding:28px;background:radial-gradient(circle at 70% 20%,#2f54ed 0,transparent 35%),linear-gradient(145deg,#07162c,#102e64)}
.login-card{width:min(440px,100%);padding:34px;border-radius:24px;background:#fff;box-shadow:0 28px 80px rgba(0,0,0,.28)}
.login-logo{display:block;width:108px;height:76px;object-fit:contain;margin:0 auto 12px}
.login-card .eyebrow{text-align:center;color:var(--blue)}
.login-card h1{text-align:center;font-size:26px;margin:9px 0 6px}
.login-card>.muted{text-align:center;line-height:1.7;margin:0 0 22px}
label{display:grid;gap:7px;font-weight:500;color:#3f4d65}
input,select{width:100%;border:1px solid var(--line);border-radius:11px;background:#fff;color:var(--ink);padding:12px 13px;outline:none;transition:.2s}
input:focus,select:focus{border-color:var(--blue2);box-shadow:0 0 0 3px rgba(49,85,235,.11)}
.login-card label+label{margin-top:14px}
.wide{width:100%;margin-top:18px}
.back-link{display:block;text-align:center;color:var(--muted);text-decoration:none;margin-top:18px}
.primary,.outline,.icon-button{border:0;border-radius:10px;padding:11px 16px;font-weight:600}
.primary{background:linear-gradient(135deg,var(--blue),var(--blue2));color:#fff;box-shadow:0 9px 20px rgba(23,53,200,.2)}
.outline{background:#fff;border:1px solid var(--line);color:var(--ink)}
.icon-button{width:42px;height:42px;padding:0;background:rgba(255,255,255,.1);border:1px solid rgba(255,255,255,.2);color:#fff}
.alert{border-radius:10px;padding:10px 12px;margin:12px 0 0;font-size:13px}
.alert.error{background:#fff1f1;color:#b52d3f;border:1px solid #ffd4d9}
.alert.success{background:#eafaf4;color:#087254;border:1px solid #bcebdc}

.site-header{height:80px;background:var(--navy);color:#fff;display:grid;grid-template-columns:1fr auto 1fr;align-items:center;padding:0 max(24px,calc((100vw - 1180px)/2));border-bottom:1px solid rgba(255,255,255,.1);gap:20px}
.brand{display:flex;align-items:center;gap:11px;text-decoration:none;color:#fff}
.brand img{width:54px;height:46px;object-fit:contain;background:#fff;border-radius:10px;padding:3px}
.brand span{display:grid}.brand strong{font-size:14px;letter-spacing:.16em}.brand small{font-size:9px;color:#b7c6dd;letter-spacing:.1em}
.header-center{text-align:center;display:grid}.header-center b{font-size:10px;color:#77dff0;letter-spacing:.18em}.header-center span{font-size:9px;color:#a5b4ca}
.header-actions{display:flex;justify-content:flex-end;align-items:center;gap:9px}.header-actions>span{max-width:180px;text-align:right;font-size:11px;color:#c5d1e2}.header-actions .outline{background:transparent;color:#fff;border-color:rgba(255,255,255,.24);padding:9px 12px}
.hero{min-height:150px;background:linear-gradient(120deg,#08213b,#0c334e);color:#fff;display:grid;grid-template-columns:1fr 1fr;align-items:center;padding:35px max(24px,calc((100vw - 1180px)/2));gap:50px}
.hero h1{font-size:36px;line-height:1.2;margin:8px 0 0}.hero>p{max-width:440px;color:#b9c8d8;line-height:1.8}
.page-grid{width:min(1180px,calc(100% - 36px));margin:28px auto 44px;display:grid;grid-template-columns:minmax(0,1.55fr) minmax(330px,.85fr);gap:24px;align-items:start}
.panel{background:var(--panel);border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow)}
.setup-panel{padding:27px}.result-column{display:grid;gap:22px;position:sticky;top:18px}.layout-panel,.summary-panel{padding:24px}
.section-title{display:flex;align-items:flex-start;gap:14px;margin-bottom:22px}.section-title>span{color:var(--coral);font-size:11px;font-weight:700;margin-top:7px}.section-title h2{font-size:23px;margin:0}.section-title p{margin:2px 0 0;color:var(--muted);font-size:12px}
.product-tabs{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;margin-bottom:28px}
.product-tabs button,.preset-grid button,.choice-grid button{border:1px solid var(--line);background:#fff;text-align:left;color:var(--ink);transition:.18s}
.product-tabs button{min-height:88px;padding:15px;border-radius:12px;display:grid;align-content:center;gap:4px}.product-tabs b{font-size:14px}.product-tabs small,.preset-grid small,.choice-grid small{color:var(--muted)}
.product-tabs button:hover,.preset-grid button:hover,.choice-grid button:hover{border-color:#9fb1eb;transform:translateY(-1px)}
.product-tabs button.active,.preset-grid button.active,.choice-grid button.active{border-color:var(--blue);background:var(--soft);box-shadow:inset 4px 0 var(--blue);color:var(--blue)}
.block-heading{display:flex;justify-content:space-between;align-items:end;margin:22px 0 12px}.block-heading h3{font-size:15px;margin:0}.block-heading p{font-size:11px;color:var(--muted);margin:3px 0 0}
.preset-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:8px}.preset-grid button{min-height:60px;padding:12px;border-radius:10px;display:flex;justify-content:space-between;align-items:center;gap:6px}.preset-grid b{font-size:13px}.preset-grid span{font-size:12px;font-weight:600}
.input-grid{display:grid;gap:12px;margin-top:17px}.input-grid.three{grid-template-columns:1fr 1fr 1fr}.input-grid.two{grid-template-columns:1fr 1fr}
.unit-input{position:relative}.unit-input input{padding-right:56px;font-size:16px;font-weight:600}.unit-input span{position:absolute;right:12px;top:50%;transform:translateY(-50%);font-size:11px;color:var(--muted)}
.metric{border:1px dashed #bcc8dc;border-radius:11px;padding:10px 13px;display:grid;align-content:center;grid-template-columns:1fr auto;column-gap:5px}.metric span{font-size:11px;color:var(--muted)}.metric b{font-size:17px}.metric small{text-align:right;color:var(--muted);font-size:9px}
.divider{height:1px;background:var(--line);margin:26px 0}
.choice-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:8px}.choice-grid.two{grid-template-columns:repeat(2,1fr)}.choice-grid button{border-radius:10px;padding:12px;display:grid;gap:3px}.choice-grid b{font-size:13px}.choice-grid strong{color:var(--blue);font-size:12px}
.rate-table{display:grid;gap:6px;margin-top:12px}.rate-row{display:grid;grid-template-columns:1fr auto;gap:8px;padding:10px 12px;background:#f7f9fd;border-radius:9px}.rate-row span{color:var(--muted);font-size:12px}.rate-row b{font-size:13px}
.option-card{padding:14px;border:1px solid var(--line);border-radius:12px;margin-top:12px}.option-card .input-grid{margin-top:10px}
.check-row{display:flex;align-items:center;gap:11px;margin-top:14px;padding:13px;border:1px solid var(--line);border-radius:11px}.check-row input{width:18px;height:18px;accent-color:var(--blue)}.check-row span{display:grid}.check-row small{font-weight:400;color:var(--muted)}
.inline-note{margin:12px 0 0;padding:12px 14px;border-radius:10px;background:#f1f5ff;color:#43547a;font-size:12px;line-height:1.6}
.sheet-visual{min-height:150px;border:1px dashed #aebcd2;border-radius:12px;background:linear-gradient(90deg,rgba(23,53,200,.04) 1px,transparent 1px),linear-gradient(rgba(23,53,200,.04) 1px,transparent 1px);background-size:16px 16px;display:grid;place-items:center;padding:18px;color:var(--blue);font-weight:600;text-align:center}
.sheet-grid{display:grid;gap:2px;width:min(210px,100%);aspect-ratio:1.25;background:#fff;border:3px solid var(--blue);padding:5px}.sheet-grid i{display:block;border:1px solid #a9b9e9;background:#e9eeff}
.layout-stats{display:grid;grid-template-columns:repeat(3,1fr);border:1px solid var(--line);border-radius:11px;margin-top:14px;overflow:hidden}.layout-stats>div{padding:11px;border-right:1px solid var(--line);display:grid}.layout-stats>div:last-child{border:0}.layout-stats span{font-size:9px;color:var(--muted)}.layout-stats b{font-size:21px}.layout-stats small{font-size:9px;color:var(--muted)}
.layout-panel>p{font-size:10px;margin:11px 0 0}
.summary-lines{display:grid}.summary-line{display:flex;justify-content:space-between;gap:16px;padding:11px 0;border-bottom:1px solid var(--line)}.summary-line span{color:var(--muted)}.summary-line b{text-align:right}
.grand-total{margin-top:19px;padding:18px;border-radius:14px;background:linear-gradient(135deg,var(--blue),var(--blue2));color:#fff;display:grid;grid-template-columns:1fr auto auto;align-items:end;gap:7px}.grand-total span{font-size:13px}.grand-total strong{font-size:32px;line-height:1}.grand-total small{font-size:11px}
.withholding-result{margin-top:10px;padding:12px;border-radius:10px;background:#fff6e5;color:#8c5c00;font-size:12px;line-height:1.6}
.summary-actions{display:grid;grid-template-columns:1fr 1fr;gap:9px;margin-top:13px}.summary-footnote{display:block;color:var(--muted);margin-top:14px;line-height:1.6;text-align:center}
footer{text-align:center;padding:28px;color:#8290a7;font-size:10px;letter-spacing:.16em}

body.dark{--ink:#e9eef8;--muted:#a6b1c5;--line:#2c3b55;--bg:#081428;--panel:#102039;--soft:#152e67;--shadow:0 18px 50px rgba(0,0,0,.2)}
body.dark input,body.dark select,body.dark .product-tabs button,body.dark .preset-grid button,body.dark .choice-grid button,body.dark .outline{background:#0c1a30;color:var(--ink)}
body.dark .rate-row,body.dark .inline-note{background:#0b1b33;color:#b9c8dc}.dark .sheet-visual{background-color:#0a172a}.dark .sheet-grid{background:#0a172a}

@media(max-width:900px){.site-header{height:auto;min-height:74px;grid-template-columns:1fr auto;padding:12px 18px}.header-center{display:none}.header-actions>span{display:none}.page-grid{grid-template-columns:1fr}.result-column{position:static}.hero{grid-template-columns:1fr;padding:30px 22px;gap:10px}.hero h1{font-size:31px}.product-tabs{grid-template-columns:1fr 1fr}}
@media(max-width:560px){body{font-size:13px}.site-header{padding:10px 13px}.brand span{display:none}.brand img{width:48px}.header-actions{gap:6px}.header-actions .outline{font-size:11px;padding:8px}.page-grid{width:calc(100% - 20px);margin-top:12px;gap:12px}.setup-panel,.layout-panel,.summary-panel{padding:18px;border-radius:14px}.product-tabs{grid-template-columns:1fr}.product-tabs button{min-height:65px}.preset-grid{grid-template-columns:1fr 1fr}.input-grid.three{grid-template-columns:1fr 1fr}.input-grid.three .metric{grid-column:1/-1}.input-grid.two{grid-template-columns:1fr}.choice-grid,.choice-grid.two{grid-template-columns:1fr 1fr}.section-title h2{font-size:20px}.layout-stats b{font-size:17px}.summary-actions{grid-template-columns:1fr}.grand-total strong{font-size:28px}}