/* Physio Compare v1 — white-locked theme (screen light must stay neutral for Shen rPPG) */
:root{
  --bg:#fbfbfd; --surf:#ffffff; --surf2:#f5f6f8; --line:#e9eaee; --line2:#dcdee3;
  --tx:#15171c; --mut:#646a72; --hint:#9aa0a8;
  --brand:#2f6fed; --brand-bg:#eef3fe; --brand-d:#1b4fc4;
  --polar:#2f6fed; --shen:#0f9d72; --shen-bg:#e8f6ef;
  --ok:#16a34a; --ok-bg:#e8f6ed; --warn:#c2740a; --warn-bg:#fbf1e0; --danger:#dc2626; --danger-bg:#fceceb;
  --r-sm:8px; --r:12px; --r-lg:16px; --r-xl:22px;
  --shadow:0 1px 2px rgba(16,20,30,.04), 0 8px 24px rgba(16,20,30,.05);
  --shadow-lg:0 12px 40px rgba(16,20,30,.12);
  --font:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Inter,system-ui,sans-serif;
  --mono:ui-monospace,"SF Mono",Menlo,Consolas,monospace;
}
*{box-sizing:border-box}
html,body{margin:0;height:100%}
body{
  background:var(--bg); color:var(--tx);
  font:15px/1.55 var(--font); -webkit-font-smoothing:antialiased;
  color-scheme:light;
}
button{font-family:inherit}
::selection{background:#cfe0ff}

/* ---------- shell ---------- */
.app{max-width:1080px; margin:0 auto; padding:20px 22px 64px}
.topbar{display:flex; align-items:center; gap:14px; padding:6px 2px 18px}
.brand{display:flex; align-items:center; gap:10px; font-weight:600; letter-spacing:-.01em; font-size:16px}
.brand .mark{width:26px;height:26px;border-radius:8px;background:var(--shen);display:flex;align-items:center;justify-content:center;color:#fff;font-size:15px}
.brand small{font-weight:400;color:var(--mut);font-size:12px}
.topbar .spacer{flex:1}
.tag{display:inline-flex;align-items:center;gap:6px;font-size:12px;color:var(--mut);background:var(--surf2);border:1px solid var(--line);padding:5px 10px;border-radius:20px}

/* breadcrumb steps */
.steps{display:flex;align-items:center;gap:4px;flex-wrap:wrap;margin:0 0 22px}
.steps .st{display:flex;align-items:center;gap:7px;font-size:12.5px;color:var(--hint);padding:5px 10px;border-radius:20px}
.steps .st .n{width:20px;height:20px;border-radius:50%;background:var(--surf2);border:1px solid var(--line2);display:flex;align-items:center;justify-content:center;font-size:11px;color:var(--hint)}
.steps .st.done{color:var(--mut)} .steps .st.done .n{background:var(--ok-bg);border-color:transparent;color:var(--ok)}
.steps .st.now{color:var(--brand-d)} .steps .st.now .n{background:var(--brand);border-color:transparent;color:#fff}
.steps .sep{color:var(--line2);font-size:13px}

/* ---------- cards & primitives ---------- */
.card{background:var(--surf);border:1px solid var(--line);border-radius:var(--r-lg);box-shadow:var(--shadow)}
.card.pad{padding:18px 20px}
.h1{font-size:23px;font-weight:600;letter-spacing:-.02em;margin:0 0 4px}
.h2{font-size:17px;font-weight:600;letter-spacing:-.01em;margin:0 0 2px}
.lead{color:var(--mut);font-size:14px;margin:0}
.muted{color:var(--mut)} .hint{color:var(--hint)} .mono{font-family:var(--mono)}
.row{display:flex;align-items:center;justify-content:space-between;gap:12px}
.wrap{display:flex;flex-wrap:wrap;gap:10px}
.grid{display:grid;gap:12px}
.sw{width:9px;height:9px;border-radius:3px;display:inline-block;vertical-align:1px}

.btn{appearance:none;cursor:pointer;font-size:13.5px;font-weight:500;border-radius:10px;padding:9px 15px;
  border:1px solid var(--line2);background:var(--surf);color:var(--tx);display:inline-flex;align-items:center;gap:7px;
  transition:background .12s,border-color .12s,transform .06s}
.btn:hover{background:var(--surf2)} .btn:active{transform:scale(.98)}
.btn.pri{background:var(--brand);border-color:var(--brand);color:#fff} .btn.pri:hover{background:var(--brand-d)}
.btn.ghost{border-color:transparent;background:transparent;color:var(--mut)} .btn.ghost:hover{background:var(--surf2)}
.btn.lg{padding:12px 20px;font-size:15px;border-radius:12px}
.btn[disabled]{opacity:.45;cursor:not-allowed;pointer-events:none}
.btn .ti{font-size:17px}

.chip{display:inline-flex;align-items:center;gap:6px;font-size:12px;padding:4px 10px;border-radius:20px;border:1px solid var(--line2);color:var(--mut);background:var(--surf)}
.chip.ok{background:var(--ok-bg);color:var(--ok);border-color:transparent}
.chip.warn{background:var(--warn-bg);color:var(--warn);border-color:transparent}
.chip.info{background:var(--brand-bg);color:var(--brand-d);border-color:transparent}
.chip.shen{background:var(--shen-bg);color:var(--shen);border-color:transparent}
.dot{width:8px;height:8px;border-radius:50%;background:var(--hint);display:inline-block}
.dot.live{background:var(--ok);box-shadow:0 0 0 4px var(--ok-bg)} .dot.warn{background:var(--warn);box-shadow:0 0 0 4px var(--warn-bg)}
.dot.pulse{animation:pulse 1.4s infinite}
@keyframes pulse{50%{opacity:.4}}

input[type=text]{width:100%;font:inherit;font-size:14px;padding:9px 12px;border:1px solid var(--line2);border-radius:10px;background:var(--surf);color:var(--tx)}
input[type=text]:focus{outline:none;border-color:var(--brand);box-shadow:0 0 0 3px var(--brand-bg)}
label.fld{display:block;font-size:12px;color:var(--mut);margin:0 0 5px}

.met{background:var(--surf2);border-radius:var(--r);padding:11px 13px}
.met .l{font-size:12px;color:var(--mut)} .met .v{font-size:18px;font-weight:600;margin-top:3px;letter-spacing:-.01em}
.met .v small{font-size:11px;font-weight:400;color:var(--mut)}

/* segmented control */
.seg{display:inline-flex;background:var(--surf2);border:1px solid var(--line);border-radius:10px;padding:3px;gap:2px}
.seg button{border:none;background:transparent;color:var(--mut);font-size:12.5px;font-weight:500;padding:6px 12px;border-radius:8px;cursor:pointer}
.seg button.on{background:var(--surf);color:var(--tx);box-shadow:var(--shadow)}
.seg.shen button.on{color:var(--shen)}

/* options (self-classify) */
.opts{display:flex;gap:10px}
.opt{flex:1;text-align:center;font-size:13px;padding:12px 8px;border:1px solid var(--line2);border-radius:12px;color:var(--mut);background:var(--surf);cursor:pointer;transition:.12s}
.opt:hover{background:var(--surf2)}
.opt.on{border-color:var(--brand);background:var(--brand-bg);color:var(--brand-d);font-weight:500}
.opt .ti{display:block;font-size:22px;margin-bottom:5px}

/* setup step cards */
.step{border:1px solid var(--line);border-radius:var(--r-lg);background:var(--surf);padding:16px 18px;transition:border-color .15s,box-shadow .15s}
.step.now{border-color:var(--brand);box-shadow:0 0 0 3px var(--brand-bg)}
.step.locked{opacity:.62}
.step-hd{display:flex;align-items:center;gap:11px}
.step-n{width:26px;height:26px;border-radius:50%;flex:0 0 auto;display:flex;align-items:center;justify-content:center;font-size:12.5px;background:var(--surf2);border:1px solid var(--line2);color:var(--hint)}
.step.done .step-n{background:var(--ok-bg);border-color:transparent;color:var(--ok)}
.step.now .step-n{background:var(--brand);border-color:transparent;color:#fff}

/* tables */
table.t{width:100%;border-collapse:collapse;font-size:13.5px}
.t th,.t td{text-align:right;padding:7px 10px;border-bottom:1px solid var(--line)}
.t th{font-weight:500;color:var(--mut);font-size:12px}
.t th:first-child,.t td:first-child{text-align:left}
.t tr:last-child td{border-bottom:none}

/* ---------- screens / transitions ---------- */
.screen{animation:fade .28s ease}
@keyframes fade{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}

/* ---------- session stage ---------- */
.stage{min-height:560px;border-radius:var(--r-xl);background:var(--surf);border:1px solid var(--line);box-shadow:var(--shadow);overflow:hidden;display:flex;flex-direction:column}
.stage-top{display:flex;align-items:center;gap:14px;padding:14px 18px;border-bottom:1px solid var(--line)}
.track{display:flex;align-items:center;flex:1;gap:0}
.tk{flex:1;display:flex;flex-direction:column;align-items:center;position:relative}
.tk .c{width:30px;height:30px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:14px;background:var(--surf2);border:1px solid var(--line2);color:var(--hint);z-index:1}
.tk.done .c{background:var(--ok-bg);border-color:transparent;color:var(--ok)}
.tk.now .c{background:var(--brand);border-color:transparent;color:#fff;box-shadow:0 0 0 4px var(--brand-bg)}
.tk .lbl{font-size:11px;color:var(--hint);margin-top:5px}
.tk.now .lbl{color:var(--brand-d)} .tk.done .lbl{color:var(--mut)}
.tk .bar{position:absolute;top:15px;left:50%;width:100%;height:2px;background:var(--line2);z-index:0}
.tk.done .bar{background:var(--ok)}
.stage-body{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;padding:26px;position:relative}
.stage-foot{display:flex;align-items:center;gap:14px;padding:12px 18px;border-top:1px solid var(--line);background:var(--surf2)}
.readout{display:inline-flex;gap:20px;padding:9px 18px;border-radius:12px;background:var(--surf);border:1px solid var(--line)}
.readout b{font-variant-numeric:tabular-nums}
.timer{font-variant-numeric:tabular-nums;font-size:13px;color:var(--mut)}
.progress{height:5px;background:var(--line);border-radius:4px;overflow:hidden;flex:1;max-width:320px}
.progress > i{display:block;height:100%;background:var(--brand);border-radius:4px;transition:width .3s linear}

/* breathing orb — 3D look; scale + text driven by JS (animateBreath) so they stay in sync */
.breath{position:relative;width:210px;height:210px;border-radius:50%;
  background:radial-gradient(circle at 38% 30%, #f0fff9 0%, #8fe0c4 40%, #2db98c 74%, #0f9d72 100%);
  box-shadow:0 20px 55px rgba(15,157,114,.38), inset -16px -20px 44px rgba(4,76,57,.5), inset 12px 14px 30px rgba(255,255,255,.55);
  display:flex;align-items:center;justify-content:center;color:#06382a;font-size:16px;font-weight:600;will-change:transform}
.breath::after{content:'';position:absolute;top:13%;left:19%;width:36%;height:28%;border-radius:50%;
  background:radial-gradient(circle, rgba(255,255,255,.9), rgba(255,255,255,0) 70%)}
.breath-ring{position:absolute;width:240px;height:240px;border-radius:50%;border:1px solid rgba(45,185,140,.28)}

/* countdown ring */
.cd{position:relative;width:160px;height:160px;display:flex;align-items:center;justify-content:center}
.cd .num{font-size:62px;font-weight:600;color:var(--brand-d);font-variant-numeric:tabular-nums}
.cd svg{position:absolute;inset:0;transform:rotate(-90deg)}
.cd circle.bgc{fill:none;stroke:var(--line);stroke-width:6}
.cd circle.fg{fill:none;stroke:var(--brand);stroke-width:6;stroke-linecap:round;transition:stroke-dashoffset 1s linear}

/* reading + transcript */
.reading{max-width:620px;font-size:26px;line-height:1.8;color:var(--tx)}
.transcript{margin-top:18px;min-height:54px;max-width:620px;font-size:15px;color:var(--mut);background:var(--surf2);border:1px solid var(--line);border-radius:12px;padding:12px 16px;text-align:right}
.transcript .fin{color:var(--tx)} .transcript .int{color:var(--hint);font-style:italic}

/* music visualizer */
.viz{display:flex;align-items:flex-end;gap:5px;height:120px}
.viz i{width:8px;background:linear-gradient(var(--shen),#7fd9bd);border-radius:4px;transition:height .09s}

/* results */
.tabs{display:flex;gap:6px;flex-wrap:wrap}
.tabs button{font-size:13px;font-weight:500;padding:8px 14px;border-radius:10px;border:1px solid var(--line2);background:var(--surf);color:var(--mut);cursor:pointer}
.tabs button.on{border-color:var(--brand);color:var(--brand-d);background:var(--brand-bg)}
svg.plot{width:100%;display:block;overflow:hidden}
.legend{font-size:12px;color:var(--mut);display:flex;gap:14px}

/* session list */
.slist .item{display:flex;align-items:center;gap:14px;padding:14px 16px;border:1px solid var(--line);border-radius:var(--r);background:var(--surf);cursor:pointer;transition:.12s}
.slist .item:hover{border-color:var(--line2);background:var(--surf2)}
.slist .item .ti.chev{margin-left:auto;color:var(--hint)}

/* per-step minute ring (session) */
.ring56{position:relative;width:48px;height:48px;flex:0 0 auto}
.ring56 svg{transform:rotate(-90deg);width:48px;height:48px}
.ring56 circle{fill:none;stroke-width:5}
.ring56 .bgc{stroke:var(--line)} .ring56 .fg{stroke:var(--brand);stroke-linecap:round}
.ring56 span{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;font-size:12px;font-variant-numeric:tabular-nums;color:var(--mut)}

/* live HR blocks (live monitor + sources) */
.hrblock{flex:1;text-align:center;padding:14px}
.hrblock .name{display:flex;align-items:center;justify-content:center;gap:8px;font-weight:500}
.hrblock .big{font-size:52px;line-height:1;font-weight:600;letter-spacing:-.02em;font-variant-numeric:tabular-nums;margin:8px 0 2px}
.hrblock .heart{display:inline-block;transform-origin:center}
.hrblock .beat{animation:beat .25s ease-out}
@keyframes beat{0%{transform:scale(1)}40%{transform:scale(1.22)}100%{transform:scale(1)}}
.hrblock .mini{display:flex;justify-content:center;gap:16px;margin-top:8px;font-size:12px;color:var(--mut)}
.hrblock .mini b{color:var(--tx);font-variant-numeric:tabular-nums}

.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);border:0}
.hidden{display:none!important}
.center{display:flex;align-items:center;justify-content:center}
.stack > * + *{margin-top:14px}