:root {
  --bg: oklch(0.15 0.007 260);
  --surface: oklch(0.195 0.008 260);
  --border: oklch(0.32 0.012 260);
  --text: oklch(0.93 0.004 260);
  --muted: oklch(0.64 0.01 260);
  --faint: oklch(0.46 0.01 260);
  --accent: oklch(0.78 0.1 80);
  --accent-dim: oklch(0.6 0.09 80);
  --danger: oklch(0.62 0.18 25);
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--text); font-family: 'Public Sans', sans-serif; }
a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-dim); text-decoration: underline; }
input::-webkit-outer-spin-button, input::-webkit-inner-spin-button { -webkit-appearance: none; margin: 0; }
input[type=number] { -moz-appearance: textfield; }

.page { min-height: 100vh; padding: 56px 24px 96px; }
.wrap { max-width: 1080px; margin: 0 auto; }

nav.topnav { display: flex; justify-content: center; gap: 36px; padding: 0 0 20px; margin-bottom: 48px; border-bottom: 1px solid var(--border); }
nav.topnav a { font-size: 13px; letter-spacing: .06em; text-transform: uppercase; color: var(--muted); padding-bottom: 14px; display: inline-block; }
nav.topnav a.active { color: var(--accent); border-bottom: 2px solid var(--accent); }

header.page-header { text-align: center; margin-bottom: 28px; }
.kicker { font-size: 12px; letter-spacing: .18em; text-transform: uppercase; color: var(--accent); margin: 0 0 8px; }
h1.page-title { font-family: 'Newsreader', serif; font-size: 34px; font-weight: 500; margin: 0 0 8px; letter-spacing: -.01em; }
.page-sub { color: var(--muted); font-size: 15px; max-width: 560px; margin: 0 auto 20px; }

.seg { display: inline-flex; border: 1px solid var(--border); border-radius: 3px; overflow: hidden; }
.seg label { display: block; margin: 0; }
.seg input { position: absolute; opacity: 0; width: 0; height: 0; }
.seg span { display: block; padding: 9px 18px; font-size: 13px; cursor: pointer; color: var(--muted); white-space: nowrap; }
.seg input:checked + span { background: var(--accent); color: var(--bg); font-weight: 600; }
.seg input:focus-visible + span { outline: 2px solid var(--accent-dim); outline-offset: -2px; }

.card { background: var(--surface); border: 1px solid var(--border); border-radius: 4px; padding: 20px 24px; margin-bottom: 16px; }
.card-dashed { background: transparent; border: 1px dashed var(--border); border-radius: 4px; padding: 14px 24px; margin-bottom: 16px; }

.step-badge { font-family: 'Newsreader', serif; font-size: 13px; color: var(--accent); border: 1px solid var(--accent); border-radius: 50%; width: 22px; height: 22px; flex-shrink: 0; display: flex; align-items: center; justify-content: center; }
h2.step-title { font-family: 'Newsreader', serif; font-size: 17px; font-weight: 500; margin: 0; white-space: nowrap; }
.field-label-upper { display: block; font-size: 12px; text-transform: uppercase; letter-spacing: .06em; color: var(--faint); margin-bottom: 8px; }

select.field, input.field { padding: 10px 14px; background: var(--bg); border: 1px solid var(--border); border-radius: 3px; color: var(--text); font-size: 15px; font-family: 'Public Sans', sans-serif; }
label.field-label { display: block; font-size: 11px; color: var(--muted); margin-bottom: 6px; }
.stepper-btn { width: 36px; height: 36px; flex-shrink: 0; background: var(--bg); border: 1px solid var(--border); border-radius: 3px; color: var(--text); font-size: 16px; cursor: pointer; }
.stepper-btn:hover { border-color: var(--accent-dim); }
.input-error { border-color: var(--danger) !important; }

.qty-stepper { display: flex; align-items: center; gap: 4px; }
.qty-stepper input[type="number"] { width: 44px; min-width: 0; text-align: center; padding: 8px 2px; }
.qty-stepper .stepper-btn { width: 30px; height: 30px; font-size: 14px; }

.pill { display: inline-flex; }
.pill input { position: absolute; opacity: 0; width: 0; height: 0; }
.pill span { padding: 9px 16px; border-radius: 20px; font-size: 13px; cursor: pointer; font-family: 'Public Sans', sans-serif; background: transparent; color: var(--muted); border: 1px solid var(--border); display: block; }
.pill input:checked + span { background: var(--accent); color: var(--bg); font-weight: 600; border-color: var(--accent); }

.stat-box { flex: 1; min-width: 180px; background: var(--surface); border: 1px solid var(--border); border-radius: 4px; padding: 18px; text-align: center; }
.stat-num { font-family: 'Newsreader', serif; font-size: 32px; color: var(--accent); margin: 0; }
.stat-label { font-size: 12px; color: var(--faint); text-transform: uppercase; letter-spacing: .05em; margin: 6px 0 0; }

.diagram-card { background: oklch(0.1 0.004 260); border: 1px solid var(--border); border-radius: 4px; padding: 16px 20px; overflow: auto; margin-bottom: 16px; }
.quick-stats { display: flex; flex-wrap: wrap; gap: 10px 28px; margin-bottom: 14px; padding-bottom: 14px; border-bottom: 1px solid var(--border); font-size: 13px; color: var(--muted); }
.quick-stats strong { color: var(--accent); font-family: 'Newsreader', serif; font-size: 16px; font-weight: 500; }

.result-section { background: var(--surface); border: 1px solid var(--border); border-radius: 4px; padding: 28px 32px; margin-bottom: 16px; }
.result-section h3 { font-family: 'Newsreader', serif; font-size: 13px; text-transform: uppercase; letter-spacing: .1em; color: var(--accent); margin: 0 0 6px; font-weight: 500; }
.result-row { display: flex; justify-content: space-between; gap: 20px; padding: 13px 0; border-bottom: 1px solid var(--border); font-size: 15px; }
.result-row:last-child { border-bottom: none; }
.result-row .rlabel { color: var(--muted); }
.result-row .rvalue { color: var(--text); text-align: right; font-weight: 500; }

.text-btn { padding: 4px 0; background: none; border: none; border-bottom: 1px solid var(--border); color: var(--muted); font-size: 13px; cursor: pointer; font-family: 'Public Sans', sans-serif; }
.text-btn:hover { color: var(--text); }
.primary-btn { padding: 13px 26px; background: var(--accent); border: 1px solid var(--accent); border-radius: 3px; color: var(--bg); font-size: 15px; font-weight: 600; cursor: pointer; font-family: 'Public Sans', sans-serif; }
.primary-btn:hover { background: var(--accent-dim); border-color: var(--accent-dim); }

.error-box { background: oklch(0.62 0.18 25 / 0.12); border: 1px solid var(--danger); color: oklch(0.85 0.1 25); padding: 16px 20px; border-radius: 3px; margin-bottom: 24px; font-size: 14px; }
.hidden { display: none !important; }

.fill-track { background: var(--bg); border: 1px solid var(--border); border-radius: 20px; height: 14px; overflow: hidden; position: relative; }
.fill-bar { height: 100%; background: var(--accent); border-radius: 20px; transition: width .2s ease; }
.fill-bar.warn { background: oklch(0.75 0.14 80); }
.fill-bar.danger { background: var(--danger); }

.hero-num { font-family: 'Newsreader', serif; font-size: 44px; color: var(--accent); margin: 0; line-height: 1; }
.hero-num.small { font-size: 32px; }
.hero-sub { font-size: 12px; color: var(--faint); text-transform: uppercase; letter-spacing: .05em; margin: 6px 0 0; }