@font-face { font-family: 'Bungee'; font-weight: 400; font-display: swap; src: url('../fonts/bungee-regular.woff2') format('woff2'); }
@font-face { font-family: 'Rubik'; font-weight: 300 900; font-display: swap; src: url('../fonts/rubik-variable.woff2') format('woff2'); }
:root { color-scheme: dark; --navy: #000d37; --cyan: #3ee6ff; --orange: #ff7a00; }
* { box-sizing: border-box; }
body { margin: 0; background: radial-gradient(ellipse at 50% -20%, #1b2f6b 0, var(--navy) 60%) fixed; color: #fff; font: 400 17px/1.55 'Rubik', system-ui, sans-serif; padding: env(safe-area-inset-top) env(safe-area-inset-right) env(safe-area-inset-bottom) env(safe-area-inset-left); }
header { text-align: center; padding: 28px 18px 8px; }
.logo { height: min(150px, 30vw); max-width: 90vw; display: block; margin: 0 auto; }
h1 { font: 400 clamp(26px, 6vw, 46px)/1.05 'Bungee', 'Rubik', sans-serif; letter-spacing: 0; margin: 14px 0 6px; text-transform: uppercase; }
h2 { font: 400 20px/1.15 'Bungee', 'Rubik', sans-serif; margin: 0 0 10px; text-transform: uppercase; }
.lead { color: #d4def7; max-width: 640px; margin: 0 auto 18px; }
main { max-width: 860px; margin: 0 auto; padding: 8px 16px 24px; display: grid; gap: 16px; }
.card { background: rgba(255,255,255,.06); border: 1px solid rgba(255,255,255,.14); border-radius: 18px; padding: 18px 20px; }
.card.mine { border-color: var(--cyan); box-shadow: 0 0 0 2px rgba(62,230,255,.25); }
.btn { display: inline-flex; align-items: center; gap: 10px; background: #fff; color: var(--navy); font-weight: 700; text-decoration: none; padding: 12px 20px; border-radius: 12px; margin: 4px 8px 4px 0; min-height: 48px; }
.btn.big { background: var(--orange); color: #111; font-size: 19px; padding: 14px 26px; }
.btn small { font-weight: 500; opacity: .85; }
.btn[aria-disabled="true"] { background: rgba(255,255,255,.18); color: #e8eefc; pointer-events: none; }
.primary { min-height: 56px; }
details { margin-top: 10px; background: rgba(0,0,0,.18); border-radius: 12px; padding: 8px 14px; }
summary { cursor: pointer; font-weight: 700; min-height: 32px; }
a { color: var(--cyan); }
.hint, footer { color: #c3cde6; }
footer { max-width: 860px; margin: 0 auto; padding: 0 18px 30px; font-size: 14px; }
code { background: rgba(0,0,0,.3); padding: 1px 6px; border-radius: 6px; font-size: 14px; }
#sums { word-break: break-all; font-size: 14px; }
:focus-visible { outline: 3px solid var(--cyan); outline-offset: 2px; }
.note{opacity:.85;font-size:.92em;margin:.4em 0 .8em}