/* Operator OS: Plain Calories' palette and calm. One number or one action per card. */
:root {
  --ink: #23202B; --bg: #F9F8FC; --card: #FFFFFF; --soft: #F4F2F8; --line: #E6E2EE; --muted: #615C6B; --faint: #8C8698;
  --accent: #5A3FC0; --accent-soft: #EFEAFB; --warm: #B4471E; --warm-soft: #FFE1D6;
  --good: #1E7A48; --good-soft: #D8F1E1; --gold: #8A6500; --gold-soft: #FFF0C2; --bad: #B4471E; --bad-soft: #FFE1D6;
  --bar: #6C4FD6; --track: #E6E2EE; --on-accent: #FFFFFF;
  --r: 18px; --shadow: 0 1px 2px rgba(35, 32, 43, .05), 0 6px 24px rgba(35, 32, 43, .05);
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --ink: #EEEBF3; --bg: #141218; --card: #1F1C25; --soft: #26232D; --line: #34303D; --muted: #B5AFC2; --faint: #7D778A;
    --accent: #B7A6FF; --accent-soft: #2E2840; --warm: #FF9B73; --warm-soft: #40261C;
    --good: #6FD39B; --good-soft: #17382A; --gold: #F2C94C; --gold-soft: #3A3016; --bad: #FF9B73; --bad-soft: #40261C;
    --bar: #9D86F0; --track: #3A3644; --on-accent: #221647; --shadow: none; color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --ink: #EEEBF3; --bg: #141218; --card: #1F1C25; --soft: #26232D; --line: #34303D; --muted: #B5AFC2; --faint: #7D778A;
  --accent: #B7A6FF; --accent-soft: #2E2840; --warm: #FF9B73; --warm-soft: #40261C;
  --good: #6FD39B; --good-soft: #17382A; --gold: #F2C94C; --gold-soft: #3A3016; --bad: #FF9B73; --bad-soft: #40261C;
  --bar: #9D86F0; --track: #3A3644; --on-accent: #221647; --shadow: none; color-scheme: dark;
}
* { box-sizing: border-box; }
html, body { margin: 0; background: var(--bg); color: var(--ink); }
body { font: 15px/1.45 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; -webkit-font-smoothing: antialiased; }
button, input, textarea, select { font: inherit; color: inherit; }
a { color: var(--accent); }
.wrap { max-width: 980px; margin: 0 auto; padding: 0 16px 96px; }

/* top */
.top { position: sticky; top: 0; z-index: 5; background: color-mix(in srgb, var(--bg) 88%, transparent); backdrop-filter: blur(10px); }
.top .wrap { display: flex; align-items: center; gap: 12px; padding-top: 12px; padding-bottom: 10px; }
.brand { font-weight: 750; letter-spacing: -.01em; font-size: 17px; display: flex; align-items: center; gap: 8px; }
.brand img { width: 26px; height: 26px; border-radius: 8px; }
.sync { margin-left: auto; font-size: 12.5px; color: var(--faint); display: flex; align-items: center; gap: 6px; white-space: nowrap; }
.dot { width: 8px; height: 8px; border-radius: 50%; background: var(--faint); display: inline-block; flex: none; }
.dot.good { background: var(--good); } .dot.warn { background: var(--gold); } .dot.bad { background: var(--bad); }
.icon-btn { border: 0; background: var(--soft); border-radius: 12px; width: 36px; height: 36px; cursor: pointer; display: grid; place-items: center; }
.tabs { display: flex; gap: 4px; padding-bottom: 8px; overflow-x: auto; scrollbar-width: none; }
.tabs button { border: 0; background: transparent; padding: 8px 14px; border-radius: 999px; cursor: pointer; color: var(--muted); font-weight: 600; white-space: nowrap; }
.tabs button[aria-current="page"] { background: var(--ink); color: var(--bg); }
@media (max-width: 640px) {
  .tabs { position: fixed; bottom: 0; left: 0; right: 0; background: var(--card); border-top: 1px solid var(--line); padding: 6px 8px calc(6px + env(safe-area-inset-bottom)); justify-content: space-around; z-index: 6; }
  .tabs button { padding: 8px 10px; font-size: 13.5px; }
}

/* cards */
h1 { font-size: 26px; letter-spacing: -.02em; margin: 14px 0 4px; }
h2 { font-size: 13px; text-transform: uppercase; letter-spacing: .06em; color: var(--faint); margin: 26px 0 10px; font-weight: 700; }
.sub { color: var(--muted); margin: 0 0 8px; }
.card { background: var(--card); border-radius: var(--r); padding: 18px; box-shadow: var(--shadow); border: 1px solid var(--line); }
.grid { display: grid; gap: 12px; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); }
.grid.two { grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); }
.stack > * + * { margin-top: 12px; }
.hero { background: var(--ink); color: var(--bg); border: 0; }
.hero .label { color: color-mix(in srgb, var(--bg) 70%, transparent); }
.hero .big-text { font-size: 21px; font-weight: 650; line-height: 1.3; letter-spacing: -.01em; margin: 6px 0 12px; }
.label { font-size: 12.5px; color: var(--faint); font-weight: 600; text-transform: uppercase; letter-spacing: .05em; }
.num { font-size: 34px; font-weight: 750; letter-spacing: -.03em; line-height: 1.1; margin: 4px 0 2px; font-variant-numeric: tabular-nums; }
.of { color: var(--faint); font-size: 14px; }
.chip { display: inline-flex; align-items: center; gap: 6px; padding: 4px 10px; border-radius: 999px; background: var(--soft); font-size: 12.5px; font-weight: 600; color: var(--muted); }
.chip.good { background: var(--good-soft); color: var(--good); } .chip.warn { background: var(--gold-soft); color: var(--gold); }
.chip.bad { background: var(--bad-soft); color: var(--bad); } .chip.accent { background: var(--accent-soft); color: var(--accent); }
.hero .chip { background: rgba(255, 255, 255, .12); color: var(--bg); }
.bar { height: 8px; background: var(--track); border-radius: 99px; overflow: hidden; margin-top: 10px; }
.bar > i { display: block; height: 100%; background: var(--bar); border-radius: 99px; }
.row { display: flex; align-items: center; gap: 10px; }
.row.between { justify-content: space-between; }
.muted { color: var(--muted); } .faint { color: var(--faint); } .small { font-size: 13px; }
.clamp2 { display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.list { display: flex; flex-direction: column; }
.item { padding: 12px 0; border-top: 1px solid var(--line); display: flex; gap: 12px; align-items: flex-start; }
.item:first-child { border-top: 0; padding-top: 2px; }
.item .grow { flex: 1; min-width: 0; }
.empty { color: var(--faint); padding: 8px 0; }

/* buttons */
.btn { border: 0; border-radius: 12px; padding: 10px 16px; font-weight: 650; cursor: pointer; background: var(--soft); }
.btn.primary { background: var(--ink); color: var(--bg); }
.btn.accent { background: var(--accent); color: var(--on-accent); }
.btn.ghost { background: transparent; color: var(--accent); padding: 8px 6px; }
.btn.small { padding: 6px 12px; font-size: 13.5px; border-radius: 10px; }
.btn:disabled { opacity: .45; cursor: default; }
.hero .btn { background: var(--bg); color: var(--ink); }
.btn:focus-visible, .tabs button:focus-visible, .icon-btn:focus-visible, .lesson-row:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; }

/* learn */
.timer { display: flex; align-items: center; gap: 14px; flex-wrap: wrap; }
.ring { --p: 0; width: 64px; height: 64px; border-radius: 50%; flex: none; display: grid; place-items: center;
  background: conic-gradient(var(--bar) calc(var(--p) * 1%), var(--track) 0); }
.ring > span { width: 50px; height: 50px; border-radius: 50%; background: var(--card); display: grid; place-items: center; font-weight: 750; font-size: 13px; font-variant-numeric: tabular-nums; }
.clock { font-size: 28px; font-weight: 750; font-variant-numeric: tabular-nums; letter-spacing: -.02em; }
.unit { margin-top: 12px; }
.unit-head { display: flex; align-items: center; gap: 10px; cursor: pointer; padding: 4px 0; background: none; border: 0; width: 100%; text-align: left; }
.unit-head .t { font-weight: 700; flex: 1; }
.lesson-row { display: flex; align-items: center; gap: 12px; padding: 11px 12px; border-radius: 12px; cursor: pointer; border: 0; background: none; width: 100%; text-align: left; }
.lesson-row:hover { background: var(--soft); }
.lesson-row[aria-expanded="true"] { background: var(--accent-soft); }
.lesson-row.locked { opacity: .45; cursor: default; }
.mark { width: 24px; height: 24px; border-radius: 50%; border: 2px solid var(--line); flex: none; display: grid; place-items: center; font-size: 13px; font-weight: 800; }
.mark.done { background: var(--good); border-color: var(--good); color: var(--card); }
.mark.open { border-color: var(--accent); }
.mark.waiting { border-style: dashed; border-color: var(--gold); }
.panel { padding: 6px 12px 18px 48px; }
@media (max-width: 640px) { .panel { padding-left: 12px; } }
.payoff { font-size: 16px; font-weight: 600; margin: 8px 0 12px; }
.objectives { margin: 0 0 14px; padding-left: 18px; color: var(--muted); }
.links { display: flex; flex-direction: column; gap: 8px; margin-bottom: 16px; }
.link { display: flex; gap: 10px; align-items: center; padding: 10px 12px; border-radius: 12px; background: var(--soft); text-decoration: none; color: var(--ink); }
.link .k { font-size: 11.5px; font-weight: 800; text-transform: uppercase; letter-spacing: .05em; padding: 3px 8px; border-radius: 8px; background: var(--card); color: var(--accent); flex: none; }
.link .k.do, .link .k.build { color: var(--warm); }
label.box { display: block; font-weight: 650; font-size: 13.5px; margin: 14px 0 6px; }
textarea { width: 100%; min-height: 96px; border: 1px solid var(--line); background: var(--card); border-radius: 12px; padding: 10px 12px; resize: vertical; line-height: 1.45; }
textarea:focus { outline: 2px solid var(--accent); border-color: transparent; }
.feel { display: flex; gap: 6px; flex-wrap: wrap; align-items: center; }
.feel button { width: 38px; height: 38px; border-radius: 10px; border: 1px solid var(--line); background: var(--card); cursor: pointer; font-weight: 700; }
.feel button[aria-pressed="true"] { background: var(--accent); color: var(--on-accent); border-color: var(--accent); }
.done-line { color: var(--good); font-weight: 650; }

/* sign in */
.signin { max-width: 420px; margin: 12vh auto 0; padding: 0 16px; text-align: center; }
.signin img { width: 72px; height: 72px; border-radius: 20px; }
.signin h1 { margin-top: 18px; }
.code-in { width: 100%; text-align: center; font-size: 26px; letter-spacing: .18em; text-transform: uppercase; padding: 12px; border-radius: 14px; border: 1px solid var(--line); background: var(--card); margin: 10px 0; }
.err { color: var(--bad); min-height: 22px; font-weight: 600; }
.bigcode { font-size: 40px; font-weight: 800; letter-spacing: .14em; font-variant-numeric: tabular-nums; margin: 10px 0; }

/* sheets */
.sheet-bg { position: fixed; inset: 0; background: rgba(20, 18, 24, .45); z-index: 20; display: grid; place-items: center; padding: 16px; }
.sheet { background: var(--card); border-radius: 22px; padding: 22px; width: min(520px, 100%); max-height: 86vh; overflow: auto; }
.toast { position: fixed; left: 50%; transform: translateX(-50%); bottom: 84px; background: var(--ink); color: var(--bg); padding: 10px 16px; border-radius: 12px; z-index: 30; font-weight: 600; max-width: calc(100% - 32px); }
.spark { display: flex; align-items: flex-end; gap: 3px; height: 44px; margin-top: 10px; }
.spark i { flex: 1; background: var(--bar); border-radius: 3px 3px 0 0; min-height: 2px; opacity: .85; }
.spark i.today { background: var(--warm); }
.week { display: flex; gap: 6px; margin-top: 10px; }
.week span { flex: 1; text-align: center; font-size: 11.5px; color: var(--faint); }
.week b { display: block; height: 30px; border-radius: 8px; background: var(--track); margin-bottom: 4px; }
.week b.hit { background: var(--good); } .week b.part { background: var(--gold-soft); } .week b.future { background: transparent; border: 1px dashed var(--line); }