:root {
  color-scheme: light;
  --page: #f9f9f7;
  --surface: #fcfcfb;
  --card: #ffffff;
  --ink: #0b0b0b;
  --ink-2: #52514e;
  --muted: #898781;
  --grid: #e1e0d9;
  --axis: #c3c2b7;
  --border: rgba(11, 11, 11, 0.10);
  --accent: #2a78d6;
  --accent-ink: #1c5cab;
  --accent-wash: rgba(42, 120, 214, 0.10);
  --track: #e8e7e2;
  --good: #006300;
  --bad: #d03b3b;
  --radius: 14px;
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --page: #0d0d0d;
    --surface: #1a1a19;
    --card: #161615;
    --ink: #ffffff;
    --ink-2: #c3c2b7;
    --grid: #2c2c2a;
    --axis: #383835;
    --border: rgba(255, 255, 255, 0.10);
    --accent: #3987e5;
    --accent-ink: #86b6ef;
    --accent-wash: rgba(57, 135, 229, 0.16);
    --track: #2c2c2a;
    --good: #0ca30c;
    --bad: #e66767;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--page);
  color: var(--ink);
  line-height: 1.45;
  font-size: 16px;
}
main { max-width: 640px; margin: 0 auto; padding: 28px 16px 120px; }
h1 { font-size: 1.75rem; line-height: 1.15; margin: 0 0 4px; letter-spacing: -0.01em; }
h2 {
  font-size: 0.8rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.06em;
  color: var(--muted); margin: 28px 4px 10px;
}
h3 { font-size: 1rem; margin: 0; }
.sub { color: var(--ink-2); margin: 0 0 20px; }
.sub strong { color: var(--ink); font-weight: 600; }

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  margin-bottom: 10px;
}
.q p { margin: 4px 0 10px; color: var(--ink-2); font-size: 0.95rem; }
.q p.detail { margin: -6px 0 12px; font-size: 0.82rem; color: var(--muted); line-height: 1.4; }
.q.done { border-color: color-mix(in srgb, var(--accent) 45%, transparent); }
.qhead { display: flex; align-items: baseline; justify-content: space-between; gap: 8px; }
.hint { font-size: 0.8rem; color: var(--muted); }

label.name { display: block; font-weight: 600; margin-bottom: 8px; }
input[type="text"], input[type="email"], input[type="password"], input[inputmode] {
  font: inherit;
  color: var(--ink);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px 12px;
  width: 100%;
}
input:focus-visible, button:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.name-hint { margin: 6px 2px 0; font-size: 0.85rem; color: var(--muted); }

/* probability slider */
.prob { display: grid; grid-template-columns: 1fr 3.6rem 1.8rem; align-items: center; gap: 8px; }
.pct {
  font-variant-numeric: tabular-nums; font-weight: 650; font-size: 1.35rem; text-align: right;
}
.unset .pct, .dist .unset .pct { color: var(--muted); font-weight: 400; }
.clear {
  border: 0; background: transparent; color: var(--muted); font-size: 1.2rem; line-height: 1;
  width: 1.8rem; height: 1.8rem; border-radius: 50%; cursor: pointer; padding: 0;
}
.clear:hover { background: var(--accent-wash); color: var(--ink); }
.unset .clear { visibility: hidden; }

input[type="range"] {
  -webkit-appearance: none; appearance: none;
  width: 100%; height: 36px; margin: 0; background: transparent; cursor: pointer;
  --fill: 50%;
}
input[type="range"]::-webkit-slider-runnable-track {
  height: 6px; border-radius: 3px;
  background: linear-gradient(to right, var(--accent) var(--fill), var(--track) var(--fill));
}
input[type="range"]::-moz-range-track { height: 6px; border-radius: 3px; background: var(--track); }
input[type="range"]::-moz-range-progress { height: 6px; border-radius: 3px; background: var(--accent); }
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none; appearance: none;
  width: 26px; height: 26px; margin-top: -10px; border-radius: 50%;
  background: var(--accent); border: 3px solid var(--card); box-shadow: 0 0 0 1px var(--border), 0 1px 3px rgba(0,0,0,.25);
}
input[type="range"]::-moz-range-thumb {
  width: 20px; height: 20px; border-radius: 50%;
  background: var(--accent); border: 3px solid var(--card); box-shadow: 0 0 0 1px var(--border), 0 1px 3px rgba(0,0,0,.25);
}
.unset input[type="range"]::-webkit-slider-runnable-track { background: var(--track); }
.unset input[type="range"]::-moz-range-progress { background: transparent; }
.unset input[type="range"]::-webkit-slider-thumb { background: var(--card); box-shadow: 0 0 0 2px var(--axis); }
.unset input[type="range"]::-moz-range-thumb { background: var(--card); box-shadow: 0 0 0 2px var(--axis); }

/* weights across options */
.dist .row { display: grid; grid-template-columns: 1fr 3.6rem 1.8rem; align-items: center; column-gap: 8px; }
.dist .row + .row { margin-top: 4px; }
.dist .opt { grid-column: 1 / -1; font-size: 0.92rem; margin-bottom: -6px; }
.dist .pct { font-size: 1.05rem; }

/* interval */
.interval { display: grid; grid-template-columns: 1fr auto 1fr auto; align-items: center; gap: 10px; }
.interval input { width: 100%; min-width: 0; text-align: center; font-variant-numeric: tabular-nums; }
.interval .unit { color: var(--ink-2); }
.interval .lbl { color: var(--ink-2); font-size: 0.95rem; }
.note { color: var(--muted); font-size: 0.82rem; margin-top: 6px; }
.err { color: var(--bad); font-size: 0.85rem; margin-top: 6px; min-height: 0; }
.err:empty { display: none; }

/* sticky save bar */
.bar {
  position: fixed; left: 0; right: 0; bottom: 0;
  background: color-mix(in srgb, var(--page) 88%, transparent);
  backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
  border-top: 1px solid var(--border);
  padding: 12px 16px calc(12px + env(safe-area-inset-bottom));
}
.bar-in { max-width: 640px; margin: 0 auto; display: flex; align-items: center; gap: 12px; }
.status { flex: 1; font-size: 0.92rem; color: var(--ink-2); min-width: 0; }
.status.ok { color: var(--good); }
.status.bad { color: var(--bad); }
button.primary {
  font: inherit; font-weight: 600; border: 0; border-radius: 12px; padding: 12px 22px;
  background: var(--accent); color: #fff; cursor: pointer; white-space: nowrap;
}
button.primary:disabled { background: var(--track); color: var(--muted); cursor: default; }
.banner {
  background: var(--accent-wash); border-radius: var(--radius); padding: 12px 16px; margin-bottom: 14px; color: var(--ink);
}
fieldset { border: 0; padding: 0; margin: 0; min-width: 0; }
fieldset:disabled { opacity: 0.7; }
.loading { color: var(--muted); }

.check { display: flex; align-items: center; gap: 10px; margin-top: 14px; font-size: 0.95rem; cursor: pointer; }
.check input { width: 20px; height: 20px; accent-color: var(--accent); margin: 0; }
#email { margin-top: 10px; }
.status a { color: var(--accent-ink); font-weight: 600; }