:root{
  --bg:#0f1420;
  --surface:#171d2c;
  --surface-2:#1f2638;
  --line:#2a3346;
  --text:#e8edf7;
  --muted:#8d9ab8;
  --body:#39435c;        /* silhouette / unworked body */
  --muscle-base:#2f3a52; /* resting muscle */
  --accent:#ff4757;
  --accent-2:#ff7a18;
  --prime:#ff3b30;
  --sec:#ffb020;
  --ok:#27c08a;
  --danger:#ff4d5e;
  --radius:18px;
  --maxw:480px;
}

*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html,body{margin:0;padding:0}
body{
  background:var(--bg);
  color:var(--text);
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  font-size:16px;
  line-height:1.45;
  overscroll-behavior-y:none;
}
h1{font-size:1.5rem;margin:0 0 .2rem}
h2{font-size:1.05rem;margin:0}
p{margin:.25rem 0}
.muted{color:var(--muted)}
.small{font-size:.82rem}
.hidden{display:none !important}

#app{
  max-width:var(--maxw);
  margin:0 auto;
  height:100vh;
  height:100dvh;          /* definite height so the session view can flex to exactly one screen */
  display:flex;
  flex-direction:column;
  position:relative;
}

/* ===== Topbar ===== */
.topbar{
  position:sticky;top:0;z-index:20;
  display:flex;align-items:center;justify-content:space-between;
  padding:calc(env(safe-area-inset-top) + 12px) 16px 12px;
  background:linear-gradient(180deg,var(--bg) 60%,rgba(15,20,32,0));
}
.brand{display:flex;align-items:center;gap:8px;font-weight:800;letter-spacing:.3px}
.brand-mark{font-size:1.3rem}
.brand-name{background:linear-gradient(90deg,var(--accent),var(--accent-2));-webkit-background-clip:text;background-clip:text;color:transparent}
.icon-btn{
  background:var(--surface-2);color:var(--text);border:1px solid var(--line);
  padding:8px 12px;border-radius:999px;font-size:.85rem;font-weight:600;cursor:pointer;
}

/* ===== Views ===== */
#main{flex:1;padding:2px 16px 84px;overflow-y:auto}
.view{display:none;animation:fade .25s ease}
.view--active{display:block}
@keyframes fade{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}
.view-head{margin:8px 0 14px}
.greeting{font-size:1.35rem;font-weight:800;margin:6px 0 16px}

/* ===== Cards ===== */
.card{
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:var(--radius);
  padding:16px;margin-bottom:14px;
}
.card-head{display:flex;align-items:baseline;justify-content:space-between;margin-bottom:8px;gap:8px}

/* ===== Stats ===== */
.stat-row{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-bottom:14px}
.stat-card{background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:12px 8px;text-align:center}
.stat-num{font-size:1.5rem;font-weight:800;background:linear-gradient(90deg,var(--accent),var(--accent-2));-webkit-background-clip:text;background-clip:text;color:transparent}
.stat-lbl{font-size:.7rem;color:var(--muted);margin-top:2px}

/* ===== Quick start ===== */
.quickstart{display:flex;align-items:center;justify-content:space-between;gap:12px;
  background:linear-gradient(135deg,rgba(255,71,87,.16),rgba(255,122,24,.10));border-color:rgba(255,71,87,.28)}
.quickstart h2{margin-bottom:2px}

/* ===== Buttons ===== */
.btn{border:none;border-radius:12px;padding:12px 16px;font-size:.95rem;font-weight:700;cursor:pointer;font-family:inherit;transition:transform .08s ease,filter .15s ease}
.btn:active{transform:scale(.97)}
.btn-primary{background:linear-gradient(135deg,var(--accent),var(--accent-2));color:#fff}
.btn-ghost{background:var(--surface-2);color:var(--text);border:1px solid var(--line)}
.btn-danger{background:var(--danger);color:#fff}
.btn-voice{background:linear-gradient(135deg,var(--ok),#15916a);color:#052017}
.btn-voice.counting{background:linear-gradient(135deg,var(--accent-2),var(--accent));color:#fff}
.btn-big{width:100%;padding:9px;font-size:.95rem;margin-top:5px}
.full{width:100%}
.link-btn{background:none;border:none;color:var(--muted);font-size:.95rem;cursor:pointer;font-family:inherit;padding:8px;min-width:48px;text-align:left}

/* ===== Filter chips ===== */
.chips{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:14px}
.chip{background:var(--surface-2);border:1px solid var(--line);color:var(--muted);padding:7px 14px;border-radius:999px;font-size:.82rem;font-weight:600;cursor:pointer;font-family:inherit}
.chip--on{background:rgba(255,71,87,.16);border-color:var(--accent);color:var(--text)}

/* ===== Exercise list ===== */
.ex-list{display:flex;flex-direction:column;gap:12px}
.ex-card{display:flex;gap:14px;align-items:center;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:14px;cursor:pointer;text-align:left;width:100%;font-family:inherit;color:inherit}
.ex-card:active{transform:scale(.99)}
.ex-emoji{font-size:1.8rem;width:46px;height:46px;display:grid;place-items:center;background:var(--surface-2);border-radius:12px;flex-shrink:0}
.ex-body{flex:1;min-width:0}
.ex-name{font-weight:700;font-size:1.02rem}
.ex-focus{color:var(--muted);font-size:.8rem;margin-top:1px}
.ex-tags{display:flex;gap:6px;margin-top:7px;flex-wrap:wrap}
.tag{font-size:.68rem;padding:3px 8px;border-radius:999px;background:var(--surface-2);color:var(--muted);border:1px solid var(--line)}
.tag-prime{background:rgba(255,59,48,.16);color:#ff8b84;border-color:rgba(255,59,48,.3)}
.lvl{font-size:.66rem;font-weight:700;padding:3px 8px;border-radius:999px;flex-shrink:0}
.lvl-Intermediate{background:rgba(255,176,32,.16);color:#ffc864}
.lvl-Advanced{background:rgba(255,71,87,.16);color:#ff8b94}

.muscle-chips{display:flex;flex-wrap:wrap;gap:5px;justify-content:center;margin:2px 0}
.mchip{font-size:.72rem;padding:4px 10px;border-radius:999px;border:1px solid var(--line);background:var(--surface-2)}
.mchip.prime{background:rgba(255,59,48,.16);border-color:rgba(255,59,48,.35);color:#ff9a93}
.mchip.sec{background:rgba(255,176,32,.14);border-color:rgba(255,176,32,.3);color:#ffce80}

/* ===== Session ===== */
.session-head{display:flex;align-items:center;justify-content:space-between;gap:8px;margin:0 0 4px}
.session-title{text-align:center;flex:1}
.session-title h1{font-size:1.05rem}
/* active workout: immersive full-screen column — video fills, controls stay compact, never scrolls */
#view-session.view--active{display:flex;flex-direction:column;gap:6px;position:relative;flex:1 1 auto;min-height:0}
#sessionMuscles{display:none}                          /* muscle map is in the guide; hidden here so the video can dominate */
body.session-mode .topbar,
body.session-mode .bottomnav{display:none}             /* hide app chrome during a set so the video owns the screen */
body.session-mode #main{display:flex;flex-direction:column;padding:calc(env(safe-area-inset-top) + 4px) 10px calc(env(safe-area-inset-bottom) + 4px);overflow:hidden}
body.session-mode #setPanel .muted.small{display:none}   /* "Reps this set" — drop to give the video more room */
body.session-mode #app{max-width:none}                   /* full-bleed: video fills the whole screen width (foldable/tablet), not a 480px column */
body.session-mode #setPanel,body.session-mode #restPanel{width:100%;max-width:460px;margin:0 auto}
/* float the End control over the video so the header row reclaims no vertical space */
body.session-mode .session-head{position:absolute;top:6px;left:4px;right:4px;margin:0;z-index:5;pointer-events:none}
body.session-mode .session-title{display:none}
body.session-mode .session-head .link-btn{pointer-events:auto;background:rgba(8,11,18,.55);color:var(--text);border-radius:999px;padding:7px 14px;min-width:0;backdrop-filter:blur(4px)}
.session-video{flex:1 1 auto;min-height:0;margin:0;display:flex;justify-content:center;align-items:center}
.session-video video{display:block;height:100%;width:100%;max-height:100%;max-width:100%;object-fit:cover;border-radius:12px;background:#0b0f17}
.set-dots{display:flex;justify-content:center;gap:7px;margin:2px 0 4px}
.set-dot{width:9px;height:9px;border-radius:50%;background:var(--surface-2);border:1px solid var(--line)}
.set-dot.done{background:var(--ok);border-color:var(--ok)}
.set-dot.current{background:var(--accent);border-color:var(--accent);box-shadow:0 0 0 3px rgba(255,71,87,.2)}

.set-panel{text-align:center;padding:8px 12px;margin-bottom:0}
.set-label{font-weight:800;font-size:.85rem;margin-bottom:0}
.set-actions{display:flex;gap:10px;margin-top:6px}
.set-actions .btn{flex:1;width:auto;margin-top:0}
.rep-stepper{display:flex;align-items:center;justify-content:center;gap:12px;margin:2px 0}
.step-btn{width:36px;height:36px;border-radius:50%;border:1px solid var(--line);background:var(--surface-2);color:var(--text);font-size:1.2rem;font-weight:700;cursor:pointer;display:grid;place-items:center}
.step-btn:active{transform:scale(.92)}
.rep-value{font-size:1.8rem;font-weight:800;min-width:50px;font-variant-numeric:tabular-nums}
.rep-value.counting{color:var(--ok)}

/* ===== Rest ring ===== */
.rest-panel{text-align:center;padding:8px 12px;margin-bottom:0}
.ring-wrap{position:relative;width:136px;height:136px;margin:4px auto}
.ring{width:136px;height:136px;transform:rotate(-90deg)}
.ring-bg{fill:none;stroke:var(--surface-2);stroke-width:8}
.ring-fg{fill:none;stroke:var(--accent);stroke-width:8;stroke-linecap:round;
  stroke-dasharray:326.7;stroke-dashoffset:0;transition:stroke-dashoffset 1s linear}
.ring-num{position:absolute;inset:0;display:grid;place-items:center;font-size:2rem;font-weight:800;font-variant-numeric:tabular-nums}
.rest-actions{display:flex;gap:10px;justify-content:center;margin-top:6px}

/* ===== History ===== */
.hist-list{display:flex;flex-direction:column;gap:10px;margin-bottom:14px}
.hist-item{display:flex;gap:12px;align-items:center;background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:12px}
.hist-emoji{font-size:1.4rem;width:40px;height:40px;display:grid;place-items:center;background:var(--surface-2);border-radius:10px}
.hist-main{flex:1;min-width:0}
.hist-name{font-weight:700;font-size:.95rem}
.hist-date{color:var(--muted);font-size:.75rem}
.hist-total{text-align:right}
.hist-total b{font-size:1.15rem;color:var(--accent)}
.empty{text-align:center;color:var(--muted);padding:30px 10px}

/* ===== Settings rows ===== */
.row{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:10px 0;border-top:1px solid var(--line)}
.row:first-of-type{border-top:none}
.input{background:var(--surface-2);border:1px solid var(--line);color:var(--text);border-radius:10px;padding:8px 10px;font-family:inherit;font-size:.95rem}
#voiceSelect{max-width:62%}
.switch{width:46px;height:26px;-webkit-appearance:none;appearance:none;background:var(--surface-2);border:1px solid var(--line);border-radius:999px;position:relative;cursor:pointer;outline:none}
.switch:checked{background:var(--accent);border-color:var(--accent)}
.switch::after{content:"";position:absolute;top:2px;left:2px;width:20px;height:20px;border-radius:50%;background:#fff;transition:left .18s ease}
.switch:checked::after{left:22px}
.mini-step{display:flex;align-items:center;gap:10px}
.mini-step button{width:34px;height:34px;border-radius:9px;border:1px solid var(--line);background:var(--surface-2);color:var(--text);font-size:1.2rem;cursor:pointer}
.mini-step .val{min-width:34px;text-align:center;font-weight:700;font-variant-numeric:tabular-nums}
.about p{margin:.4rem 0}

/* ===== Bottom nav ===== */
.bottomnav{
  position:fixed;left:0;right:0;bottom:0;z-index:30;
  max-width:var(--maxw);margin:0 auto;
  display:grid;grid-template-columns:repeat(4,1fr);
  background:rgba(23,29,44,.92);backdrop-filter:blur(12px);
  border-top:1px solid var(--line);
  padding:6px 4px calc(env(safe-area-inset-bottom) + 6px);
}
.nav-btn{background:none;border:none;color:var(--muted);font-size:.68rem;font-weight:600;display:flex;flex-direction:column;align-items:center;gap:2px;padding:6px 0;cursor:pointer;font-family:inherit}
.nav-btn span{font-size:1.25rem;filter:grayscale(.4) opacity(.7)}
.nav--on{color:var(--text)}
.nav--on span{filter:none}

/* ===== Modal ===== */
.modal-overlay{position:fixed;inset:0;z-index:50;background:rgba(8,11,18,.66);backdrop-filter:blur(3px);display:grid;place-items:center;padding:20px;animation:fade .2s ease}
.modal{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:20px;width:100%;max-width:380px;animation:pop .22s ease}
@keyframes pop{from{transform:scale(.94);opacity:.6}to{transform:none;opacity:1}}
.modal h3{margin:0 0 6px;font-size:1.2rem}
.modal-actions{display:flex;gap:10px;margin-top:18px}
.modal-actions .btn{flex:1}
.setup-row{display:flex;align-items:center;justify-content:space-between;padding:12px 0;border-top:1px solid var(--line)}
.summary-big{text-align:center;margin:10px 0}
.summary-big .big{font-size:3rem;font-weight:800;background:linear-gradient(90deg,var(--accent),var(--accent-2));-webkit-background-clip:text;background-clip:text;color:transparent}

/* ===== Exercise guide ===== */
.pose-stage{display:grid;place-items:center;background:var(--surface-2);border-radius:14px;padding:8px}
.pose-stage svg{width:100%;height:auto;max-width:340px}
.photo-demo{position:relative;width:100%;max-width:420px;aspect-ratio:3/2;background:#0b0f17;border-radius:12px;overflow:hidden}
.pdimg{position:absolute;inset:0;width:100%;height:100%;object-fit:contain;opacity:0;transition:opacity .45s ease}
.pdimg.is-on{opacity:1}
.guide-clip{width:100%;max-width:340px;margin:0 auto;border-radius:12px;overflow:hidden;background:#0b0f17}
.guide-clip video{display:block;width:100%;height:auto}
.demo-tip{margin-top:12px;padding-top:10px;border-top:1px solid var(--line)}
.twopose{display:flex;flex-direction:column;gap:16px;width:100%}
.poserow{margin:0}
.poselabel{display:flex;align-items:center;justify-content:space-between;gap:8px;font-weight:700;font-size:.86rem;color:#c3cee6;margin-bottom:4px}
.poserow .pose-stage,.poserow svg{width:100%}
.emphasis{margin:12px 0 0;font-size:.85rem;line-height:1.5;color:var(--text);background:rgba(255,71,87,.08);border:1px solid rgba(255,71,87,.2);border-radius:10px;padding:10px 12px}

.steps{margin:0;padding-left:22px;display:flex;flex-direction:column;gap:9px}
.steps li{padding-left:4px;line-height:1.5}
.steps li::marker{color:var(--accent);font-weight:800}
.keypoints{margin:0;padding-left:18px;display:flex;flex-direction:column;gap:7px;color:var(--muted)}
.keypoints li{line-height:1.45}

/* ===== Toast ===== */
.toast{position:fixed;left:50%;bottom:88px;transform:translateX(-50%) translateY(20px);z-index:60;
  background:var(--surface-2);border:1px solid var(--line);color:var(--text);
  padding:11px 18px;border-radius:999px;font-size:.88rem;font-weight:600;
  opacity:0;pointer-events:none;transition:all .25s ease;max-width:90%;text-align:center}
.toast.show{opacity:1;transform:translateX(-50%) translateY(0)}