:root {
  --bg: #0b0d12;
  --s1: #141822;
  --s2: #1c2130;
  --line: #2a3246;
  --text: #f3f5fa;
  --muted: #9aa4b8;
  --g: #22c55e;
  --g-ink: #03210e;
  --y: #eab308;
  --r: #ef4444;
  --blue: #60a5fa;
  --radius: 18px;
  --num: ui-rounded, 'SF Pro Rounded', 'Nunito', system-ui, sans-serif;
  color-scheme: dark;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.5 system-ui, -apple-system, 'Segoe UI', Roboto, 'Noto Sans', sans-serif;
  -webkit-tap-highlight-color: transparent;
}
body.in-session { overflow: hidden; }
a { color: var(--g); }
h1, h2, h3 { line-height: 1.15; margin: 0 0 8px; }
h2 { font-size: 24px; }
h3 { font-size: 17px; }
p { margin: 0 0 10px; }
code, .code { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; letter-spacing: 0.08em; }
.code { background: var(--s2); padding: 2px 8px; border-radius: 8px; font-size: 18px; color: var(--y); }
.muted { color: var(--muted); }
.small { font-size: 13px; }
.center { text-align: center; }
.err { color: var(--r); }

/* ---------- layout ---------- */
.top {
  position: sticky; top: 0; z-index: 5;
  display: flex; align-items: center; justify-content: space-between;
  max-width: 520px; margin: 0 auto; padding: 12px 16px;
  padding-top: max(12px, env(safe-area-inset-top));
  background: linear-gradient(var(--bg) 70%, transparent);
}
.logo { display: flex; gap: 3px; text-decoration: none; }
.logo .t {
  width: 26px; height: 26px; display: grid; place-items: center;
  font: 800 15px/1 var(--num); color: #fff; border-radius: 6px;
}
.t.g { background: var(--g); color: var(--g-ink); }
.t.y { background: var(--y); color: #2a1f00; }
.t.r { background: var(--r); }
.top-right { display: flex; align-items: center; gap: 8px; }
.streak-chip { background: var(--s2); border: 1px solid var(--line); border-radius: 999px; padding: 4px 10px; font: 700 14px var(--num); }
.icon-btn { background: none; border: 0; color: var(--text); font-size: 22px; padding: 4px 8px; cursor: pointer; }
.page { max-width: 520px; margin: 0 auto; padding: 4px 16px 24px; display: flex; flex-direction: column; gap: 14px; }
.foot { max-width: 520px; margin: 0 auto; padding: 8px 16px calc(24px + env(safe-area-inset-bottom)); text-align: center; color: var(--muted); font-size: 13px; }
.foot p { margin: 2px 0; }
.foot a { color: var(--muted); }

.card { background: var(--s1); border: 1px solid var(--line); border-radius: var(--radius); padding: 16px; }
.card.soft { background: transparent; border-style: dashed; }
.card p:last-child, .card ul:last-child, .card ol:last-child { margin-bottom: 0; }
.card ul, .card ol { padding-left: 20px; margin: 0 0 8px; }
.card li { margin: 4px 0; }
.kicker { font-size: 13px; letter-spacing: 0.04em; text-transform: uppercase; color: var(--muted); font-weight: 700; margin-bottom: 8px; }
.hero h1 { font-size: 34px; font-weight: 850; }
.hero-row { display: flex; gap: 14px; align-items: center; }
.ex-emoji { font-size: 52px; width: 72px; height: 72px; display: grid; place-items: center; background: var(--s2); border-radius: 18px; flex: none; }
.sub { color: var(--muted); margin: 2px 0 0; }
.note { color: var(--muted); font-size: 14px; margin: 10px 0 0; }
.tag { display: inline-block; font-size: 11px; font-weight: 700; letter-spacing: 0.03em; text-transform: uppercase; padding: 2px 7px; border-radius: 999px; background: var(--s2); color: var(--muted); border: 1px solid var(--line); vertical-align: middle; }
.tag.ok { color: var(--g); border-color: #1f5c38; }

/* ---------- buttons ---------- */
.btn {
  display: flex; align-items: center; justify-content: center; gap: 8px;
  width: 100%; min-height: 50px; padding: 12px 18px;
  border-radius: 14px; border: 1px solid var(--line);
  background: var(--s2); color: var(--text);
  font: 700 16px system-ui, sans-serif; text-decoration: none; cursor: pointer;
  transition: transform 0.08s ease, filter 0.15s;
}
.btn:active { transform: scale(0.98); }
.btn.primary { background: var(--g); border-color: var(--g); color: var(--g-ink); }
.btn.primary:hover { filter: brightness(1.07); }
.btn.ghost { background: transparent; }
.btn.danger { background: var(--r); border-color: var(--r); color: #fff; }
.confirm-row { grid-template-columns: 1fr 1fr; margin-top: 14px; }
.btn.xl { min-height: 62px; font-size: 18px; border-radius: 16px; box-shadow: 0 8px 30px -10px rgba(34, 197, 94, 0.6); }
.btn.small { min-height: 40px; font-size: 14px; padding: 8px 12px; width: auto; }
.btn:disabled { opacity: 0.45; cursor: not-allowed; }
.link { background: none; border: 0; padding: 0; color: var(--g); font: inherit; text-decoration: underline; cursor: pointer; }
.link.danger { color: var(--r); }
.row { display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; margin-top: 10px; }
.row2 { display: grid; grid-template-columns: 2fr 1fr; gap: 10px; }

.seg-toggle { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; margin-top: 14px; }
.seg-toggle button {
  background: var(--s2); border: 1px solid var(--line); color: var(--text);
  border-radius: 12px; padding: 10px; font: 700 14px system-ui, sans-serif; cursor: pointer; text-align: left;
}
.seg-toggle button small { display: block; font-weight: 500; color: var(--muted); font-size: 12px; margin-top: 2px; }
.seg-toggle button[aria-checked='true'] { border-color: var(--g); box-shadow: inset 0 0 0 1px var(--g); }
.seg-toggle.small button { text-align: center; padding: 8px; }

.privacy-card { background: #0f2418; border: 1px solid #1f5c38; color: #c9f3d8; border-radius: var(--radius); padding: 14px 16px; font-size: 14px; }
.privacy-card b { display: block; color: #e8fff0; font-size: 15px; margin-bottom: 2px; }
.privacy-mini { font-size: 13px; color: #a7e8bf; }

.quick { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; }
.quick a { text-align: center; padding: 12px 4px; border-radius: 14px; background: var(--s1); border: 1px solid var(--line); color: var(--text); text-decoration: none; font-size: 14px; font-weight: 600; }

/* ---------- result ---------- */
.result { text-align: center; }
.score b { display: block; font: 900 88px/1 var(--num); letter-spacing: -0.03em; }
.score small { color: var(--muted); font-size: 15px; }
.grid6 { display: flex; gap: 6px; justify-content: center; margin: 14px 0 6px; }
.grid6 .sq { width: 22px; height: 22px; border-radius: 5px; }
.grid6.big .sq { width: 40px; height: 40px; border-radius: 8px; }
.sq.g { background: var(--g); }
.sq.y { background: var(--y); }
.sq.r { background: var(--r); }
.legend { font-size: 12px; color: var(--muted); }
.chips { display: grid; grid-template-columns: repeat(auto-fit, minmax(130px, 1fr)); gap: 8px; margin-top: 14px; }
.chip { background: var(--s2); border-radius: 12px; padding: 10px 8px; display: flex; flex-direction: column; }
.chip b { font: 800 22px/1.15 var(--num); }
.chip span { font-size: 12px; color: var(--muted); }
.chip.hl { background: #10301d; outline: 1px solid #1f5c38; }
.share-preview {
  margin: 0; white-space: pre-wrap; word-break: break-word;
  background: var(--s1); border: 1px dashed var(--line); border-radius: 14px; padding: 12px 14px;
  font: 15px/1.5 system-ui, sans-serif; color: var(--text);
}

.vs-row { display: grid; grid-template-columns: 1fr auto 1fr; align-items: center; text-align: center; }
.vs-row b { display: block; font: 900 46px/1 var(--num); }
.vs-row span { color: var(--muted); font-size: 14px; }
.vs-row .win b { color: var(--g); }
.vs-mid { font: 900 18px var(--num); color: var(--y); padding: 0 10px; }
.verdict { text-align: center; font-weight: 700; margin: 10px 0 0; }
.duel h1 { font-size: 26px; }

.bar-row { display: grid; grid-template-columns: 9.5em 1fr 3em; gap: 8px; align-items: center; margin: 8px 0; font-size: 14px; }
.bar-row span { overflow: hidden; white-space: nowrap; text-overflow: ellipsis; }
.bar-row b { text-align: right; font-family: var(--num); }
.bar-row.me span { color: var(--g); font-weight: 700; }
.bar { height: 10px; border-radius: 99px; background: var(--s2); overflow: hidden; }
.bar i { display: block; height: 100%; background: var(--g); transform-origin: left; transition: transform 0.3s; }

.board { list-style: none; padding: 0; margin: 0; counter-reset: b; }
.board li { counter-increment: b; display: flex; justify-content: space-between; gap: 10px; padding: 8px 0; border-bottom: 1px solid var(--line); }
.board li:last-child { border-bottom: 0; }
.board li span::before { content: counter(b) '. '; color: var(--muted); }
.board li.me span { color: var(--g); font-weight: 700; }
.board b { font-family: var(--num); }
.tbl { width: 100%; border-collapse: collapse; font-size: 14px; }
.tbl th { text-align: left; color: var(--muted); font-weight: 600; font-size: 12px; padding: 4px 4px 8px; }
.tbl td { padding: 8px 4px; border-top: 1px solid var(--line); }
.tbl tr.me td { color: var(--g); font-weight: 700; }
.list { list-style: none; padding: 0; margin: 0; }
.list li { display: flex; justify-content: space-between; padding: 8px 0; border-bottom: 1px solid var(--line); }
.list li:last-child { border-bottom: 0; }

/* ---------- forms ---------- */
input[type='text'], input:not([type]), input[name] {
  width: 100%; min-height: 48px; padding: 10px 14px; border-radius: 12px;
  background: var(--bg); border: 1px solid var(--line); color: var(--text); font: 16px system-ui, sans-serif;
}
input[type='radio'], input[type='checkbox'] { width: auto; min-height: 0; accent-color: var(--g); }
.form-row { display: flex; gap: 8px; }
.form-row .btn { width: auto; }
form > * + * { margin-top: 10px; }
.kinds { display: grid; grid-template-columns: repeat(3, 1fr); gap: 6px; font-size: 14px; }
.kinds label { background: var(--s2); border-radius: 10px; padding: 8px; display: flex; gap: 6px; align-items: center; }
.field { display: block; font-size: 14px; color: var(--muted); margin-bottom: 12px; }
.field .form-row { margin-top: 6px; }
.tick { display: flex; gap: 10px; align-items: flex-start; margin: 12px 0; font-size: 15px; }
.tick input { margin-top: 4px; transform: scale(1.3); }
.steps li { margin: 8px 0; }

/* ---------- sheet + toast ---------- */
.sheet-wrap { position: fixed; inset: 0; z-index: 50; background: rgba(0, 0, 0, 0); display: flex; align-items: flex-end; justify-content: center; transition: background 0.2s; }
.sheet-wrap.open { background: rgba(0, 0, 0, 0.6); }
.sheet {
  position: relative; width: 100%; max-width: 520px; max-height: 88vh; overflow: auto;
  background: var(--s1); border: 1px solid var(--line); border-radius: 22px 22px 0 0;
  padding: 22px 18px calc(22px + env(safe-area-inset-bottom));
  transform: translateY(100%); transition: transform 0.22s ease;
}
.sheet-wrap.open .sheet { transform: none; }
.sheet-x { position: absolute; top: 10px; right: 10px; background: var(--s2); border: 0; color: var(--text); width: 34px; height: 34px; border-radius: 50%; font-size: 15px; cursor: pointer; }
.sheet h2 { padding-right: 36px; }
.menu-links { display: flex; flex-direction: column; margin: 14px 0; }
.menu-links a { padding: 12px 0; border-bottom: 1px solid var(--line); color: var(--text); text-decoration: none; }
.toast {
  position: fixed; left: 50%; bottom: calc(24px + env(safe-area-inset-bottom)); z-index: 80;
  transform: translate(-50%, 20px); opacity: 0; pointer-events: none;
  background: var(--text); color: var(--bg); padding: 10px 16px; border-radius: 12px; font-weight: 600; font-size: 14px;
  max-width: calc(100vw - 32px); transition: opacity 0.2s, transform 0.2s;
}
.toast.show { opacity: 1; transform: translate(-50%, 0); }

/* ---------- session (full screen) ---------- */
.session { position: fixed; inset: 0; z-index: 40; background: #000; color: #fff; overflow: hidden; }
.stage { position: absolute; inset: 0; }
/* contain, not cover: the player must see the exact frame the AI sees (head to feet) */
.stage video, .stage canvas { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: contain; }
.mirror .stage { transform: scaleX(-1); }
.tap-mode .stage { display: none; }
.session::after { content: ''; position: absolute; inset: 0; pointer-events: none; background: linear-gradient(rgba(0, 0, 0, 0.55), transparent 22%, transparent 60%, rgba(0, 0, 0, 0.7)); }
.session > *:not(.stage) { z-index: 2; }
.s-top { position: absolute; top: 0; left: 0; right: 0; display: flex; justify-content: space-between; align-items: flex-start; padding: 14px 16px; padding-top: max(14px, env(safe-area-inset-top)); }
.s-title span { display: block; font-size: 12px; text-transform: uppercase; letter-spacing: 0.05em; opacity: 0.8; }
.s-title b { font-size: 20px; }
.s-btns { display: flex; gap: 8px; }
.s-eye { background: rgba(255, 255, 255, 0.16); border: 0; color: #fff; width: 40px; height: 40px; border-radius: 50%; font-size: 17px; cursor: pointer; }
.skel-only .stage video { opacity: 0; }
.skel-only .s-eye { background: var(--g); }
.tap-mode .s-eye { display: none; }
.s-x { background: rgba(255, 255, 255, 0.16); border: 0; color: #fff; width: 40px; height: 40px; border-radius: 50%; font-size: 17px; cursor: pointer; }
.s-timer { position: absolute; left: 16px; right: 16px; top: calc(max(14px, env(safe-area-inset-top)) + 54px); height: 6px; border-radius: 9px; background: rgba(255, 255, 255, 0.2); overflow: hidden; display: none; }
.s-timer i { display: block; height: 100%; background: var(--g); transform-origin: left; transition: transform 0.1s linear; }
.final .s-timer i { background: var(--r); }
.s-clock { position: absolute; right: 16px; top: calc(max(14px, env(safe-area-inset-top)) + 66px); font: 900 44px/1 var(--num); display: none; text-shadow: 0 2px 12px rgba(0, 0, 0, 0.6); }
.final .s-clock { color: #ffb4b4; }
.s-count { position: absolute; left: 16px; bottom: calc(44px + env(safe-area-inset-bottom)); display: none; }
.s-count b { display: block; font: 900 120px/0.9 var(--num); letter-spacing: -0.04em; text-shadow: 0 4px 24px rgba(0, 0, 0, 0.6); }
.s-count small { font-size: 15px; opacity: 0.85; font-weight: 600; }
.pulse .s-count b { animation: pop 0.28s ease; }
@keyframes pop { 40% { transform: scale(1.18); color: var(--g); } }
.holding .s-count b { color: var(--g); }
.s-depth { position: absolute; right: 18px; bottom: calc(60px + env(safe-area-inset-bottom)); width: 14px; height: 34vh; border-radius: 9px; background: rgba(255, 255, 255, 0.18); overflow: hidden; display: none; }
.s-depth i { position: absolute; left: 0; right: 0; bottom: 0; height: 100%; background: linear-gradient(var(--g), var(--y)); transform-origin: bottom; transform: scaleY(0); transition: transform 0.08s; }
.s-depth span { position: absolute; left: -4px; right: -4px; top: 13%; height: 3px; background: #fff; }
.s-msg { position: absolute; left: 50%; top: 42%; transform: translateX(-50%); max-width: 86vw; text-align: center; font-weight: 800; font-size: 20px; text-shadow: 0 2px 10px rgba(0, 0, 0, 0.8); }
.s-msg:empty { display: none; }
.s-panel { position: absolute; left: 16px; right: 16px; top: 50%; transform: translateY(-50%); max-width: 460px; margin: 0 auto; text-align: center; }
.s-panel { max-height: calc(100% - 150px); overflow-y: auto; }
.s-panel:not(:empty) { background: rgba(12, 14, 20, 0.78); backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px); border: 1px solid rgba(255, 255, 255, 0.12); border-radius: 20px; padding: 18px; }
.s-panel .hint { color: #c9d0dd; font-size: 14px; }
.s-panel .big-line { font-size: 21px; font-weight: 800; }
.s-panel .bar { margin: 12px 0; height: 8px; }
.check { font-weight: 700; margin: 12px 0; }
.check.yes { color: var(--g); }
.check.no { color: #ffd166; }
.count-in { font: 900 120px/1 var(--num); color: var(--g); }
.done-big { font: 900 96px/1 var(--num); color: var(--g); }
.s-privacy { position: absolute; left: 0; right: 0; bottom: calc(10px + env(safe-area-inset-bottom)); text-align: center; font-size: 12px; color: #b9f5cf; }
.s-big { position: absolute; left: 50%; bottom: calc(110px + env(safe-area-inset-bottom)); transform: translateX(-50%); }
.tap-btn {
  width: min(62vw, 260px); aspect-ratio: 1; border-radius: 50%; border: 0;
  background: radial-gradient(circle at 35% 30%, #4ade80, var(--g) 60%, #15803d); color: var(--g-ink);
  font: 900 34px/1.1 var(--num); box-shadow: 0 12px 40px -8px rgba(34, 197, 94, 0.7); cursor: pointer; touch-action: manipulation; user-select: none; -webkit-user-select: none;
}
.tap-btn small { font-size: 16px; font-weight: 700; }
.tap-btn.hit { animation: hit 0.18s ease; }
@keyframes hit { 50% { transform: scale(0.93); } }

.session[data-phase='countdown'] .s-count, .session[data-phase='active'] .s-count, .session[data-phase='done'] .s-count { display: block; }
.session[data-phase='active'] .s-timer, .session[data-phase='active'] .s-clock { display: block; }
.session:not(.tap-mode):not(.hold)[data-phase='active'] .s-depth, .session:not(.tap-mode):not(.hold)[data-phase='countdown'] .s-depth { display: block; } /* depth meter: rep exercises only */
.session:not([data-phase='active']):not([data-phase='countdown']) .s-big { display: none; }
.session[data-phase='countdown'] .s-big .tap-btn { opacity: 0.4; }
.tap-mode .s-count { left: 50%; transform: translateX(-50%); text-align: center; top: calc(max(14px, env(safe-area-inset-top)) + 100px); bottom: auto; }
.tap-mode[data-phase='countdown'] .s-panel { top: 30%; }
.tap-mode .s-privacy { display: none; }

@media (min-width: 700px) {
  .hero h1 { font-size: 40px; }
  .s-count b { font-size: 150px; }
}
@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
}

/* ---------- exercise visual guide ---------- */
.btn-guide {
  display: flex; align-items: center; justify-content: space-between; gap: 10px;
  width: 100%; margin-top: 14px; padding: 12px 14px;
  background: rgba(34, 197, 94, 0.08); border: 1px solid rgba(34, 197, 94, 0.35);
  border-radius: 14px; color: var(--text); font-size: 14px; text-align: left;
  cursor: pointer; transition: background 0.15s, border-color 0.15s, transform 0.08s;
}
.btn-guide:hover { background: rgba(34, 197, 94, 0.15); border-color: var(--g); }
.btn-guide:active { transform: scale(0.99); }
.guide-icon { font-size: 20px; flex: none; }
.guide-text { flex: 1; }
.guide-text b { color: var(--g); }
.guide-arrow { color: var(--g); font-weight: 700; font-size: 16px; }

.guide-modal { display: flex; flex-direction: column; gap: 14px; text-align: left; }
.guide-title-row { display: flex; align-items: center; gap: 12px; }
.guide-emoji { font-size: 34px; width: 50px; height: 50px; display: grid; place-items: center; background: var(--s2); border-radius: 14px; flex: none; }
.guide-header h2 { font-size: 21px; margin: 0 0 2px; }

.guide-player-card {
  background: var(--s2); border: 1px solid var(--line); border-radius: 16px;
  padding: 12px; display: flex; flex-direction: column; gap: 10px;
}
.player-top-bar { display: flex; justify-content: space-between; align-items: center; font-size: 13px; font-weight: 700; }
.player-label { color: var(--muted); text-transform: uppercase; letter-spacing: 0.05em; font-size: 11px; }
.mode-toggles { display: flex; gap: 6px; }
.mode-btn {
  background: var(--s1); border: 1px solid var(--line); color: var(--muted);
  border-radius: 999px; padding: 4px 10px; font-size: 12px; font-weight: 700; cursor: pointer;
}
.mode-btn.active.ok { background: rgba(34, 197, 94, 0.2); border-color: var(--g); color: var(--g); }
.mode-btn.active.bad { background: rgba(239, 68, 68, 0.2); border-color: var(--r); color: var(--r); }

.guide-canvas-wrap {
  width: 100%; border-radius: 12px; overflow: hidden; background: #11151f;
  aspect-ratio: 400 / 250; position: relative;
}
.guide-canvas-wrap canvas { width: 100%; height: 100%; display: block; }
.target-depth-pill {
  background: var(--s1); border: 1px solid var(--line); border-radius: 10px;
  padding: 8px 12px; font-size: 13px; color: var(--text);
}
.target-depth-pill b { color: var(--g); }

.guide-sec { background: var(--s1); border: 1px solid var(--line); border-radius: 16px; padding: 14px; }
.guide-sec h3, .guide-sec h4 { margin: 0 0 8px; font-size: 15px; }
.camera-info-grid { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 8px; }
.cam-badge { background: var(--s2); border: 1px solid var(--line); border-radius: 8px; padding: 4px 8px; font-size: 12px; color: var(--muted); }
.cam-badge b { color: var(--text); }
.cam-desc { font-size: 13px; color: var(--muted); margin: 0; line-height: 1.4; }

.rules-sec { display: flex; flex-direction: column; gap: 10px; }
.rule-box { border-radius: 12px; padding: 12px; }
.rule-box.good { background: rgba(34, 197, 94, 0.08); border: 1px solid rgba(34, 197, 94, 0.25); }
.rule-box.good h4 { color: var(--g); }
.rule-box.bad { background: rgba(239, 68, 68, 0.08); border: 1px solid rgba(239, 68, 68, 0.25); }
.rule-box.bad h4 { color: var(--r); }
.rule-box ul { margin: 0; padding-left: 18px; font-size: 13px; color: var(--text); }
.rule-box li { margin-bottom: 4px; }
.tips-sec ul { margin: 0; padding-left: 18px; font-size: 13px; color: var(--muted); }
.tips-sec li { margin-bottom: 4px; }