:root { --cream:#F7F5F0; --paper:#FFFEFC; --ink:#252525; --muted:#5D646D; --blue:#314C73; --coral:#A84B37; --line:#DEDCD5; --pale-blue:#EDF1F6; --pale-coral:#F8ECE6; }
* { box-sizing:border-box; }
body { margin:0; background:var(--cream); color:var(--ink); font-family:system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif; line-height:1.6; }
button,input,select { font:inherit; }
button,select { cursor:pointer; }
button:disabled { cursor:not-allowed; opacity:.55; }
a { color:var(--blue); text-decoration-thickness:1px; text-underline-offset:3px; }
a:hover { text-decoration-thickness:2px; }
:focus-visible { outline:3px solid var(--coral); outline-offset:4px; }
[hidden] { display:none !important; }
.skip-link { position:absolute; top:-100px; left:20px; background:var(--paper); padding:12px; z-index:2; }
.skip-link:focus { top:14px; }
.site-header,main,footer { width:min(1160px,calc(100% - 64px)); margin-inline:auto; }
.site-header { display:flex; align-items:center; justify-content:space-between; padding:27px 0 23px; border-bottom:1px solid var(--line); }
.brand { font-family:Georgia,serif; font-size:30px; text-decoration:none; color:var(--ink); line-height:1; }
.brand span { display:block; margin-top:9px; font:9px system-ui,sans-serif; letter-spacing:.2em; }
.header-note { font-size:12px; color:var(--muted); }
.intro { max-width:800px; padding:49px 0 34px; }
.eyebrow { margin:0 0 16px; color:var(--coral); font-size:10px; font-weight:750; letter-spacing:.17em; }
h1 { font-family:Georgia,serif; font-weight:400; font-size:clamp(38px,5.5vw,67px); line-height:1.07; letter-spacing:-.045em; margin:0; }
.lede { max-width:620px; margin:22px 0 0; color:var(--muted); font-size:17px; line-height:1.65; }
.workspace { display:grid; grid-template-columns:1.18fr 1fr; gap:22px; align-items:start; }
.input-panel,.result-panel { background:var(--paper); border:1px solid var(--line); border-radius:18px; padding:27px; }
.panel-heading { display:flex; align-items:flex-start; gap:14px; margin-bottom:22px; }
.step { flex-shrink:0; display:grid; place-items:center; width:32px; height:32px; border-radius:50%; background:var(--pale-blue); color:var(--blue); font-size:11px; font-weight:700; }
h2 { margin:0; font-family:Georgia,serif; font-size:25px; font-weight:400; line-height:1.25; letter-spacing:-.02em; }
.panel-heading p { font-size:12px; color:var(--muted); margin:7px 0 0; }
.unit-row { display:flex; align-items:center; justify-content:space-between; gap:12px; }
label { font-size:13px; font-weight:600; }
select { border:1px solid var(--line); background:var(--paper); color:var(--ink); border-radius:8px; padding:8px 9px; max-width:100%; }
.field-help { color:var(--muted); font-size:11px; margin:8px 0 17px; }
.reading-groups { display:grid; grid-template-columns:1fr 1fr; gap:18px; margin-top:20px; }
fieldset { min-width:0; margin:0; padding:0; border:0; }
legend { font-size:10px; letter-spacing:.12em; text-transform:uppercase; color:var(--blue); font-weight:750; padding:0 0 13px; }
.field { margin-bottom:15px; }
.field label { display:block; margin-bottom:6px; }
.unit-label { color:var(--muted); font-weight:400; }
.field input { display:block; width:100%; min-height:47px; padding:9px 12px; background:#fff; color:var(--ink); border:1px solid #C7CBD0; border-radius:8px; }
.field input[aria-invalid="true"] { border-color:var(--coral); background:#FFF9F6; }
.field-error { margin:4px 0 0; font-size:11px; color:var(--coral); }
.field-error:empty { display:none; }
.checkbox-label { display:flex; align-items:flex-start; gap:8px; margin-top:4px; font-size:12px; }
.checkbox-label input { margin:4px 0 0; width:15px; height:15px; accent-color:var(--blue); flex-shrink:0; }
.actions { display:flex; flex-wrap:wrap; gap:10px; margin-top:23px; }
button { min-height:44px; border-radius:9px; border:1px solid var(--blue); background:var(--blue); color:#fff; padding:10px 15px; font-size:12px; font-weight:650; }
button:not(:disabled):hover { background:#253E60; }
button span { margin-left:11px; }
.button-secondary { background:transparent; color:var(--blue); }
.button-secondary:not(:disabled):hover { background:var(--pale-blue); }
.error-summary { margin:13px 0 0; color:var(--coral); font-size:12px; }
.error-summary:empty { display:none; }
.example-note { margin-top:25px; padding:18px; border-radius:10px; background:var(--pale-coral); }
.example-label { display:block; color:var(--coral); font-weight:750; font-size:9px; letter-spacing:.14em; }
.example-note p { font-size:12px; margin:8px 0; }
.text-button { background:transparent; border:0; color:var(--coral); padding:6px 0; min-height:32px; text-decoration:underline; text-underline-offset:3px; font-size:12px; }
.text-button:not(:disabled):hover { background:transparent; color:#793526; }
.result-status { color:var(--muted); font-size:12px; margin:0 0 15px; }
.result-status.is-example { color:var(--coral); }
.result-grid { display:grid; grid-template-columns:1fr 1fr; gap:10px; }
.result-card { padding:20px 16px 18px; border:1px solid #D5DDEA; border-radius:12px; background:var(--pale-blue); min-width:0; }
.result-card h3 { font-size:11px; font-weight:650; margin:0; color:var(--blue); }
.result-number { margin:12px 0 4px; font:36px/1.1 Georgia,serif; letter-spacing:-.025em; color:var(--blue); overflow-wrap:anywhere; }
.change-label { font-size:11px; margin:0; color:var(--muted); }
.area-card { grid-column:1/-1; background:#F4F4EE; border-color:#DDDCD0; }
.area-card .result-number { font-size:30px; }
.formula-note { margin:25px 0 0; padding-top:21px; border-top:1px solid var(--line); }
.formula-note h3 { font-size:12px; margin:0 0 11px; }
.formula-note p { color:var(--muted); font-size:12px; margin:12px 0; }
.formula-note span { display:block; margin-top:5px; color:var(--ink); }
.formula-note .small-note { font-size:11px; line-height:1.7; }
.result-limit { margin:19px 0 0; font-size:11px; color:var(--muted); }
.care-guide { margin-top:55px; padding-top:36px; border-top:1px solid var(--line); }
.care-guide h2 { max-width:650px; font-size:34px; }
.guide-grid { display:grid; grid-template-columns:1fr 1fr; gap:20px 40px; margin-top:27px; }
.guide-grid h3 { font-size:14px; margin:0 0 9px; }
.guide-grid p { font-size:13px; margin:0; line-height:1.85; color:#4E5660; }
.privacy { margin:35px 0; padding:22px 25px; background:#EEEBE3; border-radius:12px; }
.privacy h2 { font-family:inherit; font-size:13px; font-weight:700; }
.privacy p { font-size:11px; color:var(--muted); margin:9px 0 0; }
footer { display:flex; justify-content:space-between; gap:12px; padding:22px 0 30px; border-top:1px solid var(--line); color:var(--muted); font-size:11px; }
footer span:first-child { color:var(--ink); font-weight:700; }
.notice { border-left:3px solid var(--coral); padding-left:12px; font-size:13px; }
@media(max-width:850px) { .workspace { grid-template-columns:1fr; } .result-grid { grid-template-columns:1fr 1fr; } .intro { padding-top:35px; } }
@media(max-width:580px) {
  .site-header,main,footer { width:calc(100% - 34px); }
  .header-note { display:none; }
  .site-header { padding:23px 0; }
  .brand { font-size:28px; }
  .intro { padding:30px 0; }
  .lede { font-size:15px; }
  .input-panel,.result-panel { padding:20px 18px; border-radius:14px; }
  .unit-row { align-items:flex-start; flex-direction:column; gap:6px; }
  .unit-row select { width:100%; }
  .reading-groups { grid-template-columns:1fr; gap:12px; }
  fieldset + fieldset { border-top:1px solid var(--line); padding-top:16px; }
  .result-grid,.guide-grid { grid-template-columns:1fr; }
  .result-card { display:grid; grid-template-columns:minmax(0,1fr) minmax(0,1fr); align-items:center; gap:5px 12px; padding:17px; }
  .result-number { grid-column:2; grid-row:1/3; margin:0; font-size:34px; text-align:right; min-width:0; }
  .change-label { grid-column:1; }
  .area-card { grid-column:1; }
  .care-guide { margin-top:38px; padding-top:27px; }
  .care-guide h2 { font-size:29px; }
  .guide-grid { gap:22px; }
  .actions { flex-direction:column; }
  .actions button { width:100%; }
  .privacy { padding:19px; }
  footer { flex-direction:column; gap:5px; }
}
@media(prefers-reduced-motion:reduce) { *,*::before,*::after { scroll-behavior:auto !important; } }