:root{
  --bg:#0d1117; --bg2:#151b24; --card:#161d27; --line:#242e3b;
  --ink:#e9eef5; --ink2:#93a1b3; --ink3:#63718a;
  --accent:#4ade80; --accent-dim:#1f6f43; --warn:#fbbf24; --bad:#f87171;
  --r:16px; --shadow:0 1px 3px rgba(0,0,0,.4);
}
@media (prefers-color-scheme: light){
  :root{ --bg:#f6f8fb; --bg2:#eef2f7; --card:#fff; --line:#e2e8f0;
    --ink:#0f172a; --ink2:#5b6b80; --ink3:#94a3b8; --accent:#16a34a; --accent-dim:#bbf7d0;
    --shadow:0 1px 3px rgba(15,23,42,.08); }
}
*{box-sizing:border-box;margin:0;padding:0}
html,body{height:100%}
body{
  background:var(--bg); color:var(--ink);
  font:15px/1.5 -apple-system,BlinkMacSystemFont,"SF Pro Text","Segoe UI",Roboto,sans-serif;
  -webkit-font-smoothing:antialiased; overflow-x:hidden;
}
.hidden{display:none !important}
button{font:inherit;color:inherit;cursor:pointer;border:none;background:none}
input,select{font:inherit;color:inherit}

/* ---------------------------------------------------------- onboarding */
.onboard{position:fixed;inset:0;background:var(--bg);z-index:50;display:flex;align-items:center;justify-content:center;padding:24px;overflow-y:auto}
.onboard-card{width:100%;max-width:420px}
.ob-mark{font-size:44px;margin-bottom:12px}
.onboard h1{font-size:34px;letter-spacing:-.02em;margin-bottom:10px;font-weight:700}
.onboard h2{font-size:24px;letter-spacing:-.01em;margin-bottom:8px;font-weight:650}
.ob-lede{color:var(--ink2);margin-bottom:22px;font-size:15px}
.ob-list{list-style:none;margin:0 0 28px}
.ob-list li{padding:11px 0;border-top:1px solid var(--line);color:var(--ink2);font-size:14px}
.ob-list li b{color:var(--ink);font-weight:600}
.ob-actions{display:flex;gap:10px;margin-top:22px}
.ob-actions .btn{flex:1}
.big-input{
  width:100%;padding:15px 16px;background:var(--card);border:1px solid var(--line);
  border-radius:12px;font-size:19px;font-variant-numeric:tabular-nums;outline:none;
}
.big-input:focus{border-color:var(--accent)}
.hint{color:var(--ink3);font-size:12px;margin-top:7px}
.field{display:block;margin-bottom:14px}
.field>span{display:block;font-size:12px;color:var(--ink2);margin-bottom:6px;font-weight:550;
  text-transform:uppercase;letter-spacing:.05em}
.chip-row{display:flex;gap:9px;margin-bottom:20px}
.chip{flex:1;padding:15px 0;background:var(--card);border:1px solid var(--line);border-radius:12px;
  font-size:18px;font-weight:600;transition:.15s}
.chip.selected{background:var(--accent);color:#04140b;border-color:var(--accent)}
.disclaimer{background:var(--bg2);border:1px solid var(--line);border-radius:12px;padding:16px;
  font-size:13px;color:var(--ink2);line-height:1.6;margin-bottom:16px}
.disclaimer p+p{margin-top:11px}
.disclaimer b{color:var(--ink)}
.check{display:flex;align-items:center;gap:10px;font-size:14px;color:var(--ink2);cursor:pointer;margin-bottom:4px}
.check input{width:19px;height:19px;accent-color:var(--accent)}

/* ---------------------------------------------------------------- buttons */
.btn{padding:14px 20px;border-radius:12px;font-weight:600;font-size:15px;transition:.15s;text-align:center}
.btn.primary{background:var(--accent);color:#04140b}
.btn.primary:disabled{opacity:.35;cursor:not-allowed}
.btn.primary:active:not(:disabled){transform:scale(.985)}
.btn.ghost{background:var(--card);border:1px solid var(--line);color:var(--ink)}
.btn.wide{width:100%;display:block;margin-top:14px}
.btn.danger{color:var(--bad)}

/* -------------------------------------------------------------------- app */
.app{padding:0 0 82px;max-width:520px;margin:0 auto;min-height:100%}
.screen{padding:20px 16px 8px}
.hdr{display:flex;justify-content:space-between;align-items:flex-start;margin-bottom:18px;gap:12px}
.hdr h1{font-size:27px;letter-spacing:-.02em;font-weight:700}
.sub{color:var(--ink2);font-size:13px;margin-top:3px}
.streak{background:var(--card);border:1px solid var(--line);border-radius:13px;padding:9px 13px;text-align:center;flex-shrink:0}
.streak span{display:block;font-size:21px;font-weight:700;color:var(--accent);font-variant-numeric:tabular-nums}
.streak small{font-size:10px;color:var(--ink2);text-transform:uppercase;letter-spacing:.05em}

.card{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:17px;margin-bottom:13px;box-shadow:var(--shadow)}
.k{font-size:11px;color:var(--ink2);text-transform:uppercase;letter-spacing:.07em;font-weight:600;margin-bottom:8px}
.k.mt{margin-top:18px}
.muted{color:var(--ink2)} .sm{font-size:12px;line-height:1.55}
.mt{margin-top:14px}

/* goal */
.goal-head{display:flex;justify-content:space-between;margin-bottom:13px}
.goal-head .right{text-align:right}
.goal-head .v{font-size:25px;font-weight:700;font-variant-numeric:tabular-nums;letter-spacing:-.01em}
.progress{height:7px;background:var(--bg2);border-radius:99px;overflow:hidden}
.progress-fill{height:100%;background:var(--accent);border-radius:99px;transition:width .5s cubic-bezier(.4,0,.2,1);width:0}
.goal-note{font-size:12.5px;color:var(--ink2);margin-top:10px}

/* session */
.session-card h2{font-size:23px;font-weight:650;letter-spacing:-.01em;margin-bottom:10px}
.pace-pill{display:inline-flex;align-items:center;gap:9px;background:var(--bg2);border:1px solid var(--line);
  border-radius:99px;padding:7px 14px;margin-bottom:11px;font-size:13px}
.pace-pill span{color:var(--ink2);text-transform:uppercase;font-size:10px;letter-spacing:.06em;font-weight:650}
.pace-pill b{font-variant-numeric:tabular-nums;font-weight:650}
.sess-detail{font-size:14px;color:var(--ink2);line-height:1.6}
.done-flag{text-align:center;color:var(--accent);font-weight:600;font-size:14px;margin-top:13px}

/* sleep */
.sleep-row{display:flex;gap:6px}
.sleep-row button{flex:1;padding:12px 0;background:var(--bg2);border:1px solid var(--line);border-radius:10px;
  font-size:14px;font-weight:600;font-variant-numeric:tabular-nums;transition:.15s}
.sleep-row button.on{background:var(--accent);color:#04140b;border-color:var(--accent)}
.sleep-avg{font-size:12.5px;color:var(--ink2);margin-top:10px}

/* week strip */
.week-strip{display:flex;gap:6px}
.wd{flex:1;text-align:center;padding:10px 2px;background:var(--bg2);border:1px solid var(--line);border-radius:10px}
.wd.today{border-color:var(--accent);background:var(--accent-dim)}
.wd b{display:block;font-size:10px;color:var(--ink2);text-transform:uppercase;letter-spacing:.04em;margin-bottom:5px}
.wd i{font-style:normal;font-size:15px}

/* splits input */
.splits-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:7px}
.splits-grid label{display:block}
.splits-grid small{display:block;font-size:10px;color:var(--ink3);text-align:center;margin-bottom:4px;font-weight:600}
.splits-grid input{width:100%;padding:11px 4px;background:var(--bg2);border:1px solid var(--line);
  border-radius:9px;text-align:center;font-size:14px;font-variant-numeric:tabular-nums;outline:none}
.splits-grid input:focus{border-color:var(--accent)}
.inp{width:100%;padding:12px 13px;background:var(--bg2);border:1px solid var(--line);border-radius:10px;
  font-size:15px;outline:none;font-variant-numeric:tabular-nums}
.inp:focus{border-color:var(--accent)}
.row2{display:grid;grid-template-columns:1fr 1fr;gap:11px}
.err{color:var(--bad);font-size:13px;margin-top:10px;text-align:center}
.saved{color:var(--accent);font-size:13px;margin-top:10px;text-align:center;font-weight:600}

/* analysis */
.an-detail{font-size:14px;color:var(--ink2);line-height:1.6;margin-top:13px}
.stat-row{display:flex;gap:9px;margin-top:15px}
.stat{flex:1;text-align:center;background:var(--bg2);border:1px solid var(--line);border-radius:11px;padding:12px 4px}
.stat b{display:block;font-size:19px;font-weight:700;font-variant-numeric:tabular-nums;letter-spacing:-.01em}
.stat small{font-size:10px;color:var(--ink2);text-transform:uppercase;letter-spacing:.04em}

/* charts */
svg{display:block;width:100%;overflow:visible}
.bar{transition:.3s}
.axis-lbl{font-size:9px;fill:var(--ink3)}
.val-lbl{font-size:9.5px;fill:var(--ink2);font-variant-numeric:tabular-nums}

/* history */
.history{display:flex;flex-direction:column;gap:1px}
.hrow{display:flex;justify-content:space-between;align-items:center;padding:12px 0;border-top:1px solid var(--line);cursor:pointer}
.hrow:first-child{border-top:none}
.hrow .hd{font-size:13px;color:var(--ink2)}
.hrow .ht{font-size:17px;font-weight:650;font-variant-numeric:tabular-nums}
.hrow .hpb{font-size:10px;background:var(--accent);color:#04140b;padding:2px 7px;border-radius:99px;font-weight:700;margin-left:8px}
.empty{color:var(--ink3);font-size:13.5px;text-align:center;padding:22px 0}

/* plan */
.plan-week{display:flex;flex-direction:column;gap:1px}
.pw{display:flex;gap:13px;padding:13px 0;border-top:1px solid var(--line);align-items:baseline}
.pw:first-child{border-top:none}
.pw.today{background:linear-gradient(90deg,var(--accent-dim),transparent);margin:0 -8px;padding-left:8px;padding-right:8px;border-radius:9px}
.pw .d{width:36px;font-size:11px;color:var(--ink2);text-transform:uppercase;font-weight:650;letter-spacing:.04em;flex-shrink:0}
.pw .t{flex:1;font-size:14.5px;font-weight:550}
.pw .p{font-size:12px;color:var(--ink2);font-variant-numeric:tabular-nums;text-align:right}
.pw.rest .t{color:var(--ink3);font-weight:400}

.zones{display:flex;flex-direction:column;gap:1px}
.zrow{display:flex;justify-content:space-between;align-items:baseline;padding:11px 0;border-top:1px solid var(--line);gap:12px}
.zrow:first-child{border-top:none}
.zrow .zl{font-size:14px;font-weight:600}
.zrow .zb{font-size:11.5px;color:var(--ink3);margin-top:2px}
.zrow .zp{font-size:14px;font-variant-numeric:tabular-nums;font-weight:600;text-align:right;flex-shrink:0}

.evidence{display:flex;flex-direction:column;gap:13px}
.ev{font-size:12.5px;color:var(--ink2);line-height:1.6}
.ev b{color:var(--ink);display:block;margin-bottom:2px;font-size:13px;font-weight:600}
.ev i{font-style:normal;color:var(--ink3);font-size:11.5px;display:block;margin-top:3px}
.danger-card{border-color:var(--line)}

/* tabs */
.tabbar{position:fixed;bottom:0;left:0;right:0;display:flex;background:var(--card);
  border-top:1px solid var(--line);padding-bottom:env(safe-area-inset-bottom);z-index:20;
  max-width:520px;margin:0 auto}
.tab{flex:1;padding:10px 0 11px;font-size:10px;color:var(--ink3);display:flex;flex-direction:column;
  align-items:center;gap:3px;font-weight:600;letter-spacing:.02em}
.tab span{font-size:19px;line-height:1}
.tab.active{color:var(--accent)}

.toast{position:fixed;bottom:96px;left:50%;transform:translateX(-50%);background:var(--ink);color:var(--bg);
  padding:11px 20px;border-radius:99px;font-size:13.5px;font-weight:600;z-index:60;
  box-shadow:0 6px 20px rgba(0,0,0,.3);animation:pop .25s}
@keyframes pop{from{opacity:0;transform:translate(-50%,8px)}to{opacity:1;transform:translate(-50%,0)}}