/* ═══════════════════════════════════════════════════════════════════════
   ARETÉ ONE — the personal instrument. Obsidian design system, phone-first.
   House DNA: near-black field, ONE cold cyan accent, mono overlines,
   massive thin numerals, hairline grids, surgical motion. No gamification.
   Self-contained: system fonts only, zero external requests (CSP-safe).
   ═══════════════════════════════════════════════════════════════════════ */

:root{
  --bg:#05070e;
  --panel:rgba(255,255,255,.032);
  --panel-2:rgba(255,255,255,.05);
  --hair:rgba(255,255,255,.09);
  --hair-soft:rgba(255,255,255,.05);
  --txt:#e7edf6;
  --mut:#93a0b4;
  --dim:#5c6778;
  --cy:#4fc4f5;
  --cy-deep:#1c7fb0;
  --am:#dfb254;
  --ro:#f2697c;
  --ease:cubic-bezier(.22,.61,.21,1);
  --mono:ui-monospace,"Cascadia Mono","SF Mono",Consolas,Menlo,monospace;
  --sans:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  --sat:env(safe-area-inset-top,0px);
  --sab:env(safe-area-inset-bottom,0px);
}

*{box-sizing:border-box;margin:0;padding:0}
html{-webkit-text-size-adjust:100%}
html,body{max-width:100%;overflow-x:hidden;background:var(--bg)}
body{
  font-family:var(--sans);color:var(--txt);font-size:15px;line-height:1.55;
  -webkit-font-smoothing:antialiased;overscroll-behavior-y:none;
}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer;-webkit-tap-highlight-color:transparent}
input,textarea{font:inherit;color:inherit}
a{color:var(--cy);text-decoration:none}
.hidden{display:none!important}

/* ── ambient field: obsidian depth + one cold glow + faint scanline ── */
#fx{position:fixed;inset:0;z-index:-1;pointer-events:none;
  background:
    radial-gradient(120% 60% at 50% -8%, rgba(79,196,245,.075), transparent 60%),
    radial-gradient(90% 60% at 50% 115%, rgba(28,127,176,.05), transparent 60%),
    var(--bg);
}
#fx::after{content:"";position:absolute;inset:0;opacity:.028;
  background:repeating-linear-gradient(0deg,transparent 0 2px,rgba(255,255,255,.5) 2px 3px)}

/* ── voice ── */
.overline{
  font-family:var(--mono);font-size:10.5px;font-weight:600;letter-spacing:.32em;
  text-transform:uppercase;color:var(--dim);text-decoration:none;
}
.overline.cy{color:var(--cy)}
.mono{font-family:var(--mono)}
.h-display{font-weight:200;letter-spacing:-.01em;line-height:1.14;font-size:clamp(28px,7.4vw,36px)}
.p-quiet{color:var(--mut);font-size:15px;max-width:34ch}
.numeral{
  font-family:var(--mono);font-weight:200;font-variant-numeric:tabular-nums;
  font-size:clamp(88px,30vw,150px);line-height:.92;letter-spacing:-.04em;
  text-shadow:0 0 44px rgba(79,196,245,.24);
}
.t-cy{color:var(--cy);text-shadow:0 0 44px rgba(79,196,245,.26)}
.t-am{color:var(--am);text-shadow:0 0 44px rgba(223,178,84,.22)}
.t-ro{color:var(--ro);text-shadow:0 0 44px rgba(242,105,124,.22)}

/* ── screens ── */
.scr{
  position:fixed;inset:0;z-index:20;display:flex;flex-direction:column;
  padding:calc(var(--sat) + 28px) 24px calc(var(--sab) + 28px);
  background:var(--bg);overflow-y:auto;
}
.scr-center{justify-content:center;gap:18px}

/* ── the signal-bars emblem (brand mark) ── */
.emblem{display:flex;align-items:flex-end;gap:5px;height:34px}
.emblem i{display:block;width:4px;background:var(--cy);border-radius:1px;opacity:.9;
  box-shadow:0 0 12px rgba(79,196,245,.55)}
.emblem i:nth-child(1){height:30%}
.emblem i:nth-child(2){height:55%}
.emblem i:nth-child(3){height:78%}
.emblem i:nth-child(4){height:100%}

/* ── cards ── */
.card{
  background:var(--panel);border:1px solid var(--hair);border-radius:16px;
  padding:18px;box-shadow:inset 0 1px 0 rgba(255,255,255,.045);
}
.card + .card{margin-top:12px}
.card .overline{display:block;margin-bottom:10px}

/* ── buttons ── */
.btn{
  display:flex;align-items:center;justify-content:center;width:100%;min-height:52px;
  border-radius:12px;font-family:var(--mono);font-size:12.5px;font-weight:600;
  letter-spacing:.22em;text-transform:uppercase;
  transition:transform .18s var(--ease),opacity .18s;
}
.btn:active{transform:scale(.985)}
.btn-primary{background:var(--cy);color:#04121c;box-shadow:0 0 28px rgba(79,196,245,.28)}
.btn-ghost{border:1px solid var(--hair);color:var(--mut)}
.btn-ghost:active{border-color:rgba(79,196,245,.4);color:var(--txt)}
.btn-hair{min-height:44px;border-radius:10px;border:1px solid var(--hair-soft);color:var(--dim);font-size:11px}
.btn[disabled]{opacity:.4;pointer-events:none}

/* ── inputs ── */
.field{margin-bottom:12px}
.field label{display:block;margin-bottom:7px}
.input{
  width:100%;min-height:50px;padding:0 16px;border-radius:12px;
  background:var(--panel-2);border:1px solid var(--hair);color:var(--txt);
  font-size:16px;outline:none;transition:border-color .18s;
}
.input:focus{border-color:rgba(79,196,245,.45)}
textarea.input{padding:13px 16px;min-height:96px;resize:vertical}
.consent{display:flex;gap:10px;align-items:flex-start;color:var(--mut);font-size:13px;margin:14px 0 6px}
.consent input{width:18px;height:18px;margin-top:2px;accent-color:var(--cy);flex:none}
.err{color:var(--ro);font-size:13px;min-height:20px;margin-top:8px}

/* ── intro pager ── */
.slide{display:flex;flex-direction:column;gap:16px;min-height:0}
.pager{display:flex;gap:8px;margin-top:26px}
.pager i{width:22px;height:2px;background:var(--hair);transition:background .3s}
.pager i.on{background:var(--cy)}

/* ── the read: pairs ── */
.read-top{display:flex;align-items:center;justify-content:space-between;margin-bottom:8px}
.progress{height:2px;background:var(--hair-soft);border-radius:1px;overflow:hidden;margin:10px 0 26px}
.progress i{display:block;height:100%;background:var(--cy);width:0%;
  box-shadow:0 0 10px rgba(79,196,245,.6);transition:width .32s var(--ease)}
#st-pairs{flex:1;display:flex;flex-direction:column}
#st-pairs .pair{margin-top:auto}
#st-pairs .read-cap{margin-bottom:auto;padding-bottom:8vh}
.pair{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-top:6px}
.pair-card{
  aspect-ratio:1/1;border-radius:18px;background:var(--panel);border:1px solid var(--hair);
  display:flex;align-items:center;justify-content:center;padding:12%;
  transition:transform .16s var(--ease),border-color .16s,opacity .2s;
}
.pair-card svg{width:100%;height:100%}
.pair-card:active{transform:scale(.96)}
.pair-card.hit{border-color:rgba(79,196,245,.75);box-shadow:0 0 30px rgba(79,196,245,.18)}
.pair-card.miss{opacity:.28}
.read-cap{color:var(--dim);font-size:13px;text-align:center;margin-top:22px}

/* ── bio step ── */
.sleep-numeral{font-family:var(--mono);font-weight:200;font-size:76px;line-height:1;
  font-variant-numeric:tabular-nums;letter-spacing:-.03em}
.sleep-numeral small{font-size:22px;color:var(--dim);letter-spacing:0}
input[type=range]{width:100%;height:44px;-webkit-appearance:none;appearance:none;background:transparent}
input[type=range]::-webkit-slider-runnable-track{height:2px;background:var(--hair);border-radius:1px}
input[type=range]::-webkit-slider-thumb{-webkit-appearance:none;appearance:none;width:26px;height:26px;border-radius:50%;
  background:var(--cy);margin-top:-12px;box-shadow:0 0 18px rgba(79,196,245,.5)}
input[type=range]::-moz-range-track{height:2px;background:var(--hair);border-radius:1px}
input[type=range]::-moz-range-thumb{width:26px;height:26px;border:0;border-radius:50%;background:var(--cy)}
details.adv{margin-top:16px;color:var(--mut)}
details.adv summary{cursor:pointer;font-size:13px;color:var(--dim);list-style:none}
details.adv summary::-webkit-details-marker{display:none}
details.adv[open] summary{color:var(--mut)}

/* ── reveal / settle ── */
.settle{display:flex;align-items:flex-end;gap:7px;height:64px;margin:30px 0}
.settle i{display:block;width:5px;background:var(--cy);border-radius:1px;opacity:.85;
  box-shadow:0 0 14px rgba(79,196,245,.5);height:20%}
.verdict-line{font-weight:200;font-size:clamp(22px,6vw,28px);line-height:1.25;letter-spacing:-.01em}
.tier-tag{font-family:var(--mono);font-size:11px;font-weight:600;letter-spacing:.3em;text-transform:uppercase}
.felt-row{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-top:12px}

/* ── the app shell ── */
#scr-app{position:fixed;inset:0;display:flex;flex-direction:column}
.app-head{
  flex:none;display:flex;align-items:center;justify-content:space-between;
  padding:calc(var(--sat) + 18px) 22px 12px;
}
.wordmark{font-family:var(--mono);font-size:12px;font-weight:600;letter-spacing:.42em;color:var(--mut)}
.app-body{flex:1;overflow-y:auto;padding:6px 22px calc(var(--sab) + 128px);-webkit-overflow-scrolling:touch}
.tab{display:none}
.tab.on{display:block}

/* hero */
.hero{padding:26px 0 8px;text-align:left}
.hero .numeral{display:block;margin:6px 0 2px}
.hero-sub{color:var(--mut);font-size:14px;margin-top:10px}

/* thin metric bars */
.bar{height:3px;background:var(--hair-soft);border-radius:2px;overflow:hidden;margin-top:8px}
.bar i{display:block;height:100%;background:var(--cy);width:0%;border-radius:2px;
  transition:width .9s var(--ease)}
.bar.am i{background:var(--am)}
.bar.ro i{background:var(--ro)}
.kv{display:flex;justify-content:space-between;align-items:baseline;font-size:13px;color:var(--mut)}
.kv b{font-family:var(--mono);font-weight:600;color:var(--txt);font-variant-numeric:tabular-nums}

/* record rows */
.row{
  display:flex;align-items:center;gap:14px;padding:13px 2px;border-bottom:1px solid var(--hair-soft);
  font-size:14px;color:var(--mut);
}
.row:last-child{border-bottom:0}
.row .dot{width:7px;height:7px;border-radius:50%;flex:none;background:var(--cy);box-shadow:0 0 8px rgba(79,196,245,.5)}
.row .dot.am{background:var(--am);box-shadow:0 0 8px rgba(223,178,84,.45)}
.row .dot.ro{background:var(--ro);box-shadow:0 0 8px rgba(242,105,124,.45)}
.row b{font-family:var(--mono);font-weight:600;color:var(--txt);margin-left:auto;font-variant-numeric:tabular-nums}
.spark{width:100%;height:64px;display:block;margin:6px 0 2px}

/* signature bars */
.fn-row{margin-top:13px}
.fn-row .kv{font-size:12.5px}
.sig-name{font-weight:200;font-size:clamp(24px,6.6vw,30px);letter-spacing:-.01em;line-height:1.2}

/* ── tab bar ── */
.tabbar{
  position:fixed;left:0;right:0;bottom:0;z-index:30;
  display:grid;grid-template-columns:1fr 1fr 72px 1fr 1fr;align-items:end;
  padding:10px 10px calc(var(--sab) + 10px);
  background:rgba(5,7,14,.78);backdrop-filter:blur(18px);-webkit-backdrop-filter:blur(18px);
  border-top:1px solid var(--hair-soft);
}
.tb{
  display:flex;flex-direction:column;align-items:center;gap:5px;min-height:48px;justify-content:center;
  color:var(--dim);font-family:var(--mono);font-size:9px;font-weight:600;letter-spacing:.22em;text-transform:uppercase;
  transition:color .2s;
}
.tb svg{width:21px;height:21px;stroke:currentColor;fill:none;stroke-width:1.5}
.tb.on{color:var(--cy)}
.tb-read{
  width:60px;height:60px;border-radius:50%;margin:0 auto;transform:translateY(-14px);
  background:var(--cy);display:flex;align-items:center;justify-content:center;
  box-shadow:0 0 34px rgba(79,196,245,.42);
  transition:transform .18s var(--ease);
}
.tb-read:active{transform:translateY(-14px) scale(.94)}
.tb-read .ebars{display:flex;align-items:flex-end;gap:3px;height:20px}
.tb-read .ebars i{display:block;width:3px;background:#04121c;border-radius:1px}
.tb-read .ebars i:nth-child(1){height:35%}
.tb-read .ebars i:nth-child(2){height:65%}
.tb-read .ebars i:nth-child(3){height:100%}

/* toast */
#toast{
  position:fixed;left:50%;bottom:calc(var(--sab) + 104px);transform:translateX(-50%) translateY(8px);
  background:rgba(10,14,24,.92);border:1px solid var(--hair);border-radius:12px;
  padding:11px 18px;font-size:13px;color:var(--mut);opacity:0;pointer-events:none;
  transition:opacity .3s,transform .3s;z-index:40;max-width:86vw;text-align:center;
}
#toast.on{opacity:1;transform:translateX(-50%) translateY(0)}

/* honest footnote */
.foot{color:var(--dim);font-size:11.5px;line-height:1.6;margin:26px 0 6px}

/* focus */
:focus-visible{outline:2px solid rgba(79,196,245,.55);outline-offset:2px;border-radius:6px}

/* ── motion (surgical; readings settle) ── */
@media (prefers-reduced-motion:no-preference){
  .reveal{opacity:0;transform:translateY(14px);animation:rise .62s var(--ease) forwards}
  .reveal.d1{animation-delay:.08s}.reveal.d2{animation-delay:.16s}.reveal.d3{animation-delay:.24s}
  .reveal.d4{animation-delay:.32s}.reveal.d5{animation-delay:.42s}
  @keyframes rise{to{opacity:1;transform:none}}
  .emblem i{animation:breathe 3.6s ease-in-out infinite}
  .emblem i:nth-child(2){animation-delay:.35s}
  .emblem i:nth-child(3){animation-delay:.7s}
  .emblem i:nth-child(4){animation-delay:1.05s}
  @keyframes breathe{0%,100%{opacity:.85}50%{opacity:.45}}
}
@media (prefers-reduced-motion:reduce){
  .reveal{opacity:1;transform:none}
  .progress i,.bar i{transition:none}
}

@media (min-width:560px){
  .scr,.app-body,.app-head{max-width:520px;margin-left:auto;margin-right:auto}
  .tabbar{max-width:520px;left:50%;transform:translateX(-50%);border-left:1px solid var(--hair-soft);border-right:1px solid var(--hair-soft)}
}