:root{
  --bg:#f6f7fb; --card:#ffffff; --ink:#0f172a; --muted:#64748b;
  --line:#e5e9f0; --brand:#4f46e5; --brand-ink:#ffffff;
  --yes:#16a34a; --yes-bg:#dcfce7;
  --maybe:#d97706; --maybe-bg:#fef3c7;
  --no:#dc2626; --no-bg:#fee2e2;
  --blank:#eef1f6;
  --radius:16px;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  background:var(--bg); color:var(--ink); line-height:1.45;
  padding-bottom:70px;
  -webkit-tap-highlight-color:transparent;
}
h1,h2,h3{margin:0 0 .3em}
h1{font-size:1.25rem;letter-spacing:-.02em}
h2{font-size:1.05rem}
h3.section-title{font-size:.98rem;margin:1.4em 0 .6em;color:var(--muted);text-transform:uppercase;letter-spacing:.04em}
p{margin:.2em 0}
.muted{color:var(--muted)}
.small{font-size:.85rem}

/* top bar */
.topbar{
  position:sticky;top:0;z-index:20;
  display:flex;align-items:center;justify-content:space-between;gap:12px;
  padding:12px 16px;background:rgba(255,255,255,.92);backdrop-filter:blur(8px);
  border-bottom:1px solid var(--line);
}
.brand{display:flex;align-items:center;gap:12px}
.logo{font-size:1.6rem}
.who{
  border:1px solid var(--line);background:var(--card);border-radius:999px;
  padding:7px 14px;font-size:.9rem;font-weight:600;cursor:pointer;color:var(--ink);
}
.who:hover{border-color:var(--brand)}

/* layout */
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);margin:16px;padding:18px}
main{max-width:760px;margin:0 auto;padding:0 4px}
.picker{max-width:760px;margin:24px auto}

/* names */
.names{display:flex;flex-wrap:wrap;gap:10px;margin-top:14px}
.name-btn{
  border:1px solid var(--line);background:var(--card);border-radius:12px;
  padding:12px 18px;font-size:1rem;font-weight:600;cursor:pointer;color:var(--ink);
}
.name-btn:hover{border-color:var(--brand);color:var(--brand)}
.name-btn.primary{background:var(--brand);color:#fff;border-color:var(--brand)}
.pill{display:inline-block;padding:6px 12px;border-radius:999px;background:var(--blank);font-size:.9rem;font-weight:600;margin:0 8px 8px 0}

/* tabs */
.tabs{display:flex;gap:6px;padding:14px 16px 0;max-width:760px;margin:0 auto;position:sticky;top:57px;background:var(--bg);z-index:10}
.tab{
  flex:1;border:1px solid var(--line);background:var(--card);border-radius:12px 12px 0 0;
  padding:11px 8px;font-size:.92rem;font-weight:600;cursor:pointer;color:var(--muted);
  border-bottom:none;
}
.tab.active{color:var(--brand);background:var(--card);box-shadow:inset 0 -3px 0 var(--brand)}
.tabpane{max-width:760px;margin:0 auto;padding:0 16px}
.tabpane[hidden]{display:none}

/* legend */
.legend{display:flex;flex-wrap:wrap;align-items:center;gap:10px;padding:14px 0}
.chip{padding:4px 12px;border-radius:999px;font-size:.83rem;font-weight:700}
.chip.yes{background:var(--yes-bg);color:var(--yes)}
.chip.maybe{background:var(--maybe-bg);color:var(--maybe)}
.chip.no{background:var(--no-bg);color:var(--no)}

/* calendars */
.month{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:12px;margin-bottom:14px}
.month h4{margin:0 0 10px;font-size:.95rem;text-transform:capitalize}
.grid{display:grid;grid-template-columns:repeat(7,1fr);gap:5px}
.dow{font-size:.72rem;font-weight:700;color:var(--muted);text-align:center;padding-bottom:3px;text-transform:uppercase}
.day{
  aspect-ratio:1/1;border-radius:10px;border:1px solid transparent;background:var(--blank);
  display:flex;flex-direction:column;align-items:center;justify-content:center;
  font-size:.92rem;font-weight:600;cursor:pointer;color:#334155;position:relative;
  user-select:none;
}
.day.empty{background:transparent;cursor:default}
.day small{font-size:.6rem;font-weight:700;opacity:.75}
.day.yes{background:var(--yes-bg);color:var(--yes);border-color:#bbf7d0}
.day.maybe{background:var(--maybe-bg);color:var(--maybe);border-color:#fde68a}
.day.no{background:var(--no-bg);color:var(--no);border-color:#fecaca;text-decoration:line-through}
.day.today{outline:2px solid var(--brand);outline-offset:1px}
.day.heat{cursor:pointer;color:#0f172a}
.day.heat.e0{background:#f1f5f9}
.day .cnt{font-size:.62rem;font-weight:800;opacity:.85}

/* best list */
.best{display:flex;flex-direction:column;gap:10px;margin-top:12px}
.bestrow{display:flex;align-items:center;gap:12px;background:var(--card);border:1px solid var(--line);border-radius:14px;padding:12px 14px;cursor:pointer}
.bestrow .rank{font-size:.8rem;font-weight:800;color:var(--muted);min-width:22px}
.bestrow .date{font-weight:700;text-transform:capitalize;flex:1}
.bestrow .mini{font-size:.8rem;font-weight:700;display:flex;gap:6px}
.badge{padding:3px 9px;border-radius:8px;font-size:.78rem;font-weight:800}
.badge.yes{background:var(--yes-bg);color:var(--yes)}
.badge.maybe{background:var(--maybe-bg);color:var(--maybe)}
.badge.no{background:var(--no-bg);color:var(--no)}

/* status */
.statusrow{display:flex;justify-content:space-between;gap:10px;padding:10px 12px;border:1px solid var(--line);border-radius:12px;background:var(--card);margin-bottom:8px}
.statusrow .n{font-weight:700}
.statusrow .s{color:var(--muted);font-size:.85rem;text-align:right}

/* toast */
.toast{position:fixed;left:50%;bottom:84px;transform:translateX(-50%);background:#0f172a;color:#fff;padding:10px 18px;border-radius:999px;font-size:.88rem;font-weight:600;z-index:60;box-shadow:0 8px 24px rgba(0,0,0,.2)}
.toast.warn{background:#b45309}

/* sheet */
.sheet{position:fixed;inset:0;background:rgba(15,23,42,.45);z-index:50;display:flex;align-items:flex-end;justify-content:center}
.sheet-card{background:#fff;width:100%;max-width:560px;border-radius:20px 20px 0 0;padding:22px 20px 30px;max-height:80vh;overflow:auto;position:relative}
.sheet-close{position:absolute;right:14px;top:12px;border:none;background:var(--blank);width:34px;height:34px;border-radius:50%;font-size:1rem;cursor:pointer}
.sheet h3{text-transform:capitalize}
.sheet .grp{margin-top:12px}
.sheet .grp b{font-size:.85rem;text-transform:uppercase;letter-spacing:.03em}

.foot{max-width:760px;margin:24px auto 0;padding:16px;display:flex;justify-content:space-between;border-top:1px solid var(--line)}
.foot a{color:var(--muted);text-decoration:none}

@media(max-width:420px){
  .day{font-size:.85rem}
  .bestrow .mini{flex-wrap:wrap}
}