:root {
  --paper: #fafafa; --ink: #0a0a0a; --g100: #f5f5f5; --g300: #d4d4d4; --g500: #737373; --g800: #262626; --red: #e63946;
  --mono: "JetBrains Mono", ui-monospace, monospace; --head: "Space Grotesk", system-ui, sans-serif; --body: Inter, system-ui, sans-serif;
}
* { box-sizing: border-box; }
html, body { margin: 0; background: var(--paper); color: var(--ink); font: 16px/1.6 var(--body); -webkit-tap-highlight-color: transparent; }
body { min-height: 100dvh; }
.hidden { display: none !important; }
.red { color: var(--red); }
.kicker { font: 500 12px/1.2 var(--mono); text-transform: uppercase; letter-spacing: .08em; color: var(--g500); }
.kicker.red { color: var(--red); }
h1, h2 { font-family: var(--head); font-weight: 700; line-height: 1.05; margin: .3em 0; }
h1 { font-size: 40px; } h2 { font-size: 32px; }
.sub, .note { color: var(--g500); margin: 0; }
.note { font-size: 13px; }
button { font: 500 13px var(--mono); text-transform: uppercase; letter-spacing: .06em; cursor: pointer; border-radius: 0; }
.primary { width: 100%; padding: 16px; background: var(--ink); color: var(--paper); border: 2px solid var(--ink); }
.primary:active { background: var(--red); border-color: var(--red); }
.primary.inv { background: var(--paper); color: var(--ink); border-color: var(--paper); }
.ghost { width: 100%; padding: 14px; background: transparent; color: inherit; border: 2px solid currentColor; margin-top: 8px; }
.ghost.small { width: auto; padding: 6px 10px; margin: 0; border-width: 1px; font-size: 11px; }

.screen { display: none; }
.screen.active { display: block; }

#home { max-width: 30rem; margin: 0 auto; padding: max(24px, env(safe-area-inset-top)) 16px 40px; }
.top { border-top: 4px solid var(--ink); padding-top: 12px; margin-bottom: 20px; }
.banner { display: flex; align-items: center; gap: 12px; border: 2px solid var(--ink); padding: 10px 12px; margin-bottom: 16px; }
.banner strong { font: 700 24px var(--mono); color: var(--red); flex: 1; }
.grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; }
.tile { aspect-ratio: 1; border: 1px solid var(--g300); background: var(--g100); display: flex; flex-direction: column; justify-content: space-between; padding: 8px; text-align: left; text-transform: none; letter-spacing: 0; font: 500 12px var(--body); color: var(--ink); position: relative; }
.tile .glyph { font: 700 22px var(--head); }
.tile.locked { background: var(--ink); color: var(--paper); border-color: var(--ink); }
.tile.locked::after { content: "LOCKED"; position: absolute; top: 8px; right: 8px; font: 500 8px var(--mono); letter-spacing: .1em; color: var(--red); }
.settings { margin-top: 28px; border-top: 1px solid var(--g300); padding-top: 12px; }
.settings summary { cursor: pointer; list-style: none; padding: 4px 0 8px; }
.settings label { display: flex; justify-content: space-between; align-items: center; gap: 12px; padding: 8px 0; border-bottom: 1px solid var(--g300); font-size: 14px; }
.settings label.row { justify-content: flex-start; }
.settings select, .settings input[type=number] { font: 14px var(--mono); padding: 4px 6px; border: 1px solid var(--g300); background: var(--paper); border-radius: 0; max-width: 55%; }
.settings input[type=file] { font-size: 12px; max-width: 55%; }
.settings .note { margin-top: 12px; }

.sheet { position: fixed; inset: 0; background: rgba(10,10,10,.55); display: flex; align-items: flex-end; z-index: 20; }
.sheet-body { width: 100%; max-width: 30rem; margin: 0 auto; background: var(--paper); padding: 24px 16px max(24px, env(safe-area-inset-bottom)); border-top: 4px solid var(--red); }
.sheet-body.ink { background: var(--ink); color: var(--paper); }
.sheet-body p { margin: 0 0 16px; }
.seg { display: grid; grid-template-columns: 1fr 1fr; border: 2px solid var(--ink); margin-bottom: 12px; }
.seg button { padding: 12px; background: transparent; border: 0; color: var(--ink); }
.seg button.on { background: var(--ink); color: var(--paper); }
#shieldHint { margin-bottom: 16px; }

#workout { position: fixed; inset: 0; background: var(--ink); color: var(--paper); }
.stage { position: absolute; inset: 0; overflow: hidden; }
#video, #overlay { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.mirror { transform: scaleX(-1); }
.hud { position: absolute; inset: 0; padding: max(16px, env(safe-area-inset-top)) 16px max(16px, env(safe-area-inset-bottom)); display: flex; flex-direction: column; pointer-events: none; }
.hud > * { pointer-events: auto; }
.hud-top { display: flex; justify-content: space-between; align-items: center; }
.hud .kicker { color: var(--paper); background: var(--ink); padding: 4px 6px; }
.count { font: 700 96px/1 var(--head); text-shadow: 0 2px 12px rgba(0,0,0,.5); margin-top: 8px; }
.count #reps { color: var(--paper); }
.count .of { font-size: 40px; color: var(--g300); }
.count.bump #reps { color: var(--red); }
.msg { align-self: flex-start; background: var(--paper); color: var(--ink); font: 600 17px/1.3 var(--body); padding: 8px 12px; margin-top: 8px; max-width: 100%; border-left: 4px solid var(--ink); }
.msg.bad { border-left-color: var(--red); }
.checks { list-style: none; padding: 0; margin: 10px 0 0; display: flex; gap: 6px; flex-wrap: wrap; }
.checks li { font: 500 11px var(--mono); text-transform: uppercase; letter-spacing: .06em; padding: 4px 8px; background: rgba(10,10,10,.7); color: var(--g300); border: 1px solid var(--g800); }
.checks li.ok { color: var(--ink); background: var(--paper); border-color: var(--paper); }
.checks li.ok::before { content: "✓ "; }
.log { list-style: none; padding: 0; margin: auto 0 8px; font: 12px/1.6 var(--mono); }
.log li { background: rgba(10,10,10,.7); display: inline-block; padding: 0 6px; margin: 1px 0; }
.log li.bad { color: var(--red); }
.debug { font: 11px/1.4 var(--mono); background: rgba(10,10,10,.7); color: var(--g300); margin: 0 0 8px; padding: 6px 8px; white-space: pre-wrap; }
.skip { align-self: flex-start; color: var(--paper); }