:root {
  --page-bg: #ffffff;
  --ink: #16283a;
  --ink-soft: #52626f;
  --subtitle: #157a71;
  --card-light: #eef5f4;
  --card-line: #dbe8e6;
  --field-bg: #ffffff;
  --circle-1: #106b64;
  --circle-23: #0f8f81;
  --pill-bg: #0f8f81;
  --pill-hover: #0c7a6e;
  --navy-panel: #0e2130;
  --navy-card: #17293a;
  --navy-card-line: #2a3d4d;
  --on-navy: #ffffff;
  --on-navy-soft: #c9d9dd;
  --weeks-teal: #34d6c4;
  --weeks-amber: #f0a654;
  --out-bg: #ffffff;
  --out-ink: #16283a;
  --error: #b42318;
  --focus: #f0a654;
  --footnote: #66737d;
  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, serif;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  color-scheme: light dark;
  box-sizing: border-box;
  padding-top: env(safe-area-inset-top, 0px);
  padding-bottom: env(safe-area-inset-bottom, 0px);
}
@media (prefers-color-scheme: dark) {
  :root {
    --page-bg: #0b151d;
    --ink: #eef4f2;
    --ink-soft: #a9bdc2;
    --subtitle: #4fd6c9;
    --card-light: #142530;
    --card-line: #233843;
    --field-bg: #0b151d;
    --navy-panel: #10202c;
    --panel-line: #2a3d4d;
    --out-bg: #0b151d;
    --out-ink: #eef4f2;
    --error: #ff8a80;
    --footnote: #8e9ea7;
  }
}
*, *::before, *::after { box-sizing: border-box; }
html { scroll-padding-top: env(safe-area-inset-top, 0px); }
body {
  margin: 0;
  background: var(--page-bg);
  color: var(--ink);
  font-family: var(--sans);
  line-height: 1.5;
}
.wrap { max-width: 1040px; margin: 0 auto; padding: 40px 24px 56px; }
h1 {
  font-family: var(--serif);
  font-weight: 700;
  font-size: clamp(26px, 4vw, 38px);
  line-height: 1.15;
  margin: 0 0 10px;
}
.subtitle { color: var(--subtitle); font-size: 18px; font-weight: 500; margin: 0 0 28px; max-width: 60ch; }

:focus-visible { outline: 3px solid var(--focus); outline-offset: 2px; }

.top-row { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin-bottom: 18px; }
.step-card { background: var(--card-light); border: 1px solid var(--card-line); border-radius: 14px; padding: 20px; }
.step-head { display: flex; align-items: center; gap: 12px; margin-bottom: 8px; }
.step-head h2 { margin: 0; font-size: 17px; font-weight: 700; }
.circle {
  flex: none; width: 34px; height: 34px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  color: #fff; font-weight: 700; font-size: 16px;
}
.circle.one { background: var(--circle-1); }
.circle.two, .circle.three { background: var(--circle-23); }
.step-desc { font-size: 14px; color: var(--ink-soft); margin: 0 0 14px; }

.field-box {
  display: flex; align-items: center; justify-content: center; gap: 8px;
  border: 1.5px solid var(--circle-23); border-radius: 10px;
  background: var(--field-bg); padding: 10px 12px;
}
.field-box:focus-within { outline: 3px solid var(--focus); outline-offset: 2px; }
.field-box input {
  width: 110px; border: none; background: transparent; outline: none;
  font: 700 18px var(--sans); text-align: center; color: var(--ink);
  border-bottom: 2px solid var(--circle-23); padding-bottom: 2px;
}
.field-box input::placeholder { color: var(--ink-soft); font-weight: 400; }
.field-box.invalid { border-color: var(--error); }
.unit { font-weight: 700; font-size: 16px; }
.field-error { color: var(--error); font-size: 13.5px; margin: 8px 0 0; }

.pill-select {
  width: 100%; text-overflow: ellipsis; border: none; border-radius: 10px;
  padding: 14px 40px 14px 16px; color: #fff;
  font: 700 15px var(--sans); cursor: pointer;
  appearance: none; -webkit-appearance: none;
  background-color: var(--pill-bg);
  background-image: linear-gradient(45deg, transparent 50%, #fff 50%), linear-gradient(135deg, #fff 50%, transparent 50%);
  background-position: calc(100% - 20px) center, calc(100% - 15px) center;
  background-size: 5px 5px, 5px 5px;
  background-repeat: no-repeat;
}
.pill-select:hover { background-color: var(--pill-hover); }
.pill-select option { color: #16283a; background: #fff; }

.sub-field { margin-top: 12px; display: flex; flex-direction: column; gap: 4px; }
.sub-field[hidden] { display: none; }
.sub-field label { font-size: 13.5px; color: var(--ink-soft); font-weight: 600; }
.sub-field input {
  font: 600 15px var(--sans); color: var(--ink);
  background: var(--field-bg); border: 1.5px solid var(--card-line);
  border-radius: 8px; padding: 8px 10px; width: 100%;
}

.calc-panel { border: 1px solid var(--panel-line, transparent); background: var(--navy-panel); color: var(--on-navy); border-radius: 16px; padding: 26px 24px; margin-bottom: 18px; }
.calc-title { color: var(--weeks-teal); font-weight: 700; font-size: 18px; margin: 0 0 8px; }
.calc-summary { font-family: var(--serif); font-size: clamp(18px, 2.4vw, 22px); line-height: 1.4; margin: 0 0 8px; max-width: 62ch; }
.calc-formula { color: var(--on-navy-soft); font-size: 14px; margin: 0 0 20px; }

.results { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 14px; }
.result-card { background: var(--navy-card); border: 1px solid var(--navy-card-line); border-radius: 12px; padding: 18px; }
.result-card.selected { border: 2px solid var(--weeks-teal); }
.result-card.hard.selected { border-color: var(--weeks-amber); }
.date-label { font-weight: 700; font-size: 15px; margin-bottom: 4px; display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.badge { font-size: 12px; font-weight: 700; color: #0e2130; background: var(--weeks-teal); border-radius: 999px; padding: 1px 8px; }
.hard .badge { background: var(--weeks-amber); }
.weeks { font-family: var(--serif); font-weight: 700; font-size: 26px; color: var(--weeks-teal); margin-bottom: 14px; }
.hard .weeks { color: var(--weeks-amber); }
.per-week-label { color: var(--on-navy-soft); font-size: 13.5px; margin-bottom: 8px; }
.week-output {
  display: flex; align-items: baseline; justify-content: center; gap: 6px;
  background: var(--out-bg); color: var(--out-ink);
  border-radius: 8px; padding: 10px 12px; border: 2px dashed var(--weeks-teal);
}
.hard .week-output { border-color: var(--weeks-amber); }
.week-output .num { font-family: var(--serif); font-weight: 800; font-size: 20px; }
.week-output .lbl { font-weight: 600; font-size: 14px; }
.hours { color: var(--on-navy-soft); font-size: 13px; margin-top: 8px; }
.passed { color: var(--weeks-amber); font-weight: 600; font-size: 14px; }

.footnote { font-size: 13px; color: var(--footnote); max-width: 80ch; }

@media (max-width: 800px) {
  .top-row { grid-template-columns: 1fr; }
  .wrap { padding: 28px 16px 40px; }
}
@media print {
  .calc-panel, .result-card { background: #fff; color: #000; border: 1px solid #999; }
  .calc-formula, .per-week-label, .hours { color: #333; }
  .pill-select { color: #000; background: #fff; border: 1px solid #999; }
}