:root { color-scheme: dark; --bg:#0d1b20; --panel:#14262d; --teal:#2dd4bf; --text:#e8f1f2; --muted:#9db4ba; }
* { box-sizing: border-box; }
body { margin:0; font-family: -apple-system, system-ui, sans-serif; background:var(--bg); color:var(--text); padding: max(16px, env(safe-area-inset-top)) 16px 32px; }
h1 { font-size: 28px; margin: 8px 0 2px; }
h2 { font-size: 22px; margin-top: 28px; }
.sub, .note, .fineprint { color: var(--muted); }
.fineprint { font-size: 13px; line-height: 1.45; }
button { background: var(--panel); color: var(--text); border: 1px solid var(--teal); border-radius: 12px; padding: 12px 16px; font-size: 17px; margin: 4px 4px 4px 0; }
button:active { background: var(--teal); color: #06231e; }
#session-picker { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; margin-top: 16px; }
#session-picker button { padding: 18px 10px; font-weight: 600; }
#progress { height: 10px; background: var(--panel); border-radius: 6px; overflow: hidden; margin: 16px 0; }
#progress-bar { height: 100%; width: 0%; background: var(--teal); transition: width .3s; }
#step-name { font-size: 26px; font-weight: 700; margin: 12px 0 2px; }
#clock { font-size: 84px; font-weight: 800; text-align: center; margin: 8px 0; font-variant-numeric: tabular-nums; }
#step-list li.done { color: var(--muted); text-decoration: line-through; }
#step-list li.current { color: var(--teal); font-weight: 700; }
label { display: block; margin: 10px 0; font-size: 15px; color: var(--muted); }
input, select, textarea { width: 100%; margin-top: 4px; padding: 10px; font-size: 17px; border-radius: 10px; border: 1px solid #2b454e; background: var(--panel); color: var(--text); }
.grid { display: grid; grid-template-columns: 1fr 1fr; gap: 0 12px; }
.exercise { background: var(--panel); border-radius: 14px; padding: 14px; margin: 12px 0; }
.exercise input { width: 72px; display: inline-block; }
.row { display: flex; flex-wrap: wrap; gap: 4px; }
section { max-width: 640px; margin: 0 auto; }
main, #lock-screen { max-width: 640px; margin: 0 auto; }