:root{
  /* BYU palette — navy #002E5D · royal #0047BA · white (brand.byu.edu/colors) */
  --navy:#002e5d; --royal:#0047ba;
  --bg:#f1f5fb; --card:#fff; --ink:#0f2744; --muted:#5e748c;
  --line:#dbe4f0; --accent:#0047ba; --accent-soft:#e7eefb;
  --danger:#b23c3c;
  --shadow:0 1px 2px rgba(0,46,93,.07),0 12px 32px rgba(0,46,93,.10);
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  background:var(--bg); color:var(--ink);
  font-family:Inter,-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  -webkit-font-smoothing:antialiased; line-height:1.45; padding:28px 16px 64px;
}
button{font-family:inherit;color:inherit}
/* BYU navy -> royal accent stripe */
body::before{content:"";position:fixed;top:0;left:0;right:0;height:4px;z-index:60;
  background:linear-gradient(90deg,var(--navy) 0%,var(--royal) 70%,#0062b8 100%)}
.app{max-width:760px;margin:0 auto}

/* ---------- top bar ---------- */
.topbar{display:flex;align-items:center;justify-content:space-between;gap:16px;margin-bottom:18px}
.brand{display:flex;align-items:center;gap:12px}
.logo{font-size:30px;line-height:1}
.topbar h1{margin:0;font-size:21px;font-weight:700;letter-spacing:-.01em;color:var(--navy)}
.sub{font-size:12.5px;color:var(--muted)}
.topbar-right{display:flex;align-items:center;gap:10px}
.gear{font-size:19px;text-decoration:none;opacity:.75;transition:opacity .15s}
.gear:hover{opacity:1}

/* ---------- month nav ---------- */
.monthbar{display:flex;align-items:center;justify-content:center;gap:18px;margin:0 0 16px}
.month-title{margin:0;font-size:17px;font-weight:600;min-width:180px;text-align:center;letter-spacing:-.01em;color:var(--navy)}
.navbtn{
  width:34px;height:34px;border-radius:50%;display:flex;align-items:center;justify-content:center;
  background:#fff;border:1px solid var(--line);color:var(--ink);font-size:18px;line-height:1;
  cursor:pointer;box-shadow:0 1px 2px rgba(0,46,93,.06);transition:all .15s;padding:0
}
.navbtn:hover{border-color:var(--accent);color:var(--accent)}

/* ---------- sheet ---------- */
.sheet{background:var(--card);border-radius:16px;box-shadow:var(--shadow);padding:8px 0 4px;overflow:hidden}
.loading{color:var(--muted);padding:24px;text-align:center}

/* ---------- add row ---------- */
.addrow{display:flex;gap:10px;padding:14px 18px 12px;border-bottom:1px solid var(--line)}
.addrow input{
  flex:1;border:1px solid var(--line);border-radius:10px;padding:11px 13px;font-size:14.5px;
  font-family:inherit;background:#f7f9fd;color:var(--ink);transition:border-color .15s,background .15s
}
.addrow input:focus{outline:none;border-color:var(--accent);background:#fff}
.addbtn{
  background:var(--royal);color:#fff;border:none;border-radius:10px;padding:11px 20px;
  font-size:14.5px;font-weight:600;font-family:inherit;cursor:pointer;transition:filter .15s
}
.addbtn:hover{filter:brightness(1.08)}
.addbtn.block{width:100%;margin-top:18px;padding:13px}
.ghostbtn{
  background:#fff;border:1px solid var(--line);border-radius:10px;padding:11px 16px;font-size:14px;
  font-weight:600;font-family:inherit;color:var(--ink);cursor:pointer;transition:all .15s
}
.ghostbtn:hover{border-color:var(--accent);color:var(--accent)}
.btnrow{display:flex;gap:10px;flex-wrap:wrap;margin-top:18px}

/* ---------- groups ---------- */
.group{padding:6px 0 2px}
.group-head{display:flex;align-items:center;gap:8px;padding:12px 18px 6px}
.group-title{font-size:11.5px;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--muted)}
.group-count{
  font-size:11px;font-weight:700;color:var(--accent);background:var(--accent-soft);
  border-radius:999px;padding:1px 8px;min-width:20px;text-align:center
}
.empty{padding:14px 18px 20px;color:var(--muted);font-size:14px}

/* ---------- task row ---------- */
.row{display:flex;align-items:center;gap:14px;padding:11px 18px;transition:background .12s}
.row:hover{background:#f7fafd}
.row+.row{border-top:1px solid #edf2fa}
.circle{
  width:25px;height:25px;border-radius:50%;border:2px solid #b8c7dd;background:transparent;
  cursor:pointer;padding:0;flex:0 0 auto;display:flex;align-items:center;justify-content:center;
  transition:border-color .15s,background .15s,transform .1s
}
.circle:hover{border-color:var(--accent);background:var(--accent-soft)}
.circle:active{transform:scale(.92)}
.circle.checked{background:var(--accent);border-color:var(--accent)}
.tick{color:#fff;font-size:14px;font-weight:700;line-height:1}
.name{flex:1;font-size:15px;font-weight:500;letter-spacing:-.005em}
.row.done .name{color:var(--muted);text-decoration:line-through;text-decoration-color:#b8c7dd}
.when{font-size:12px;color:var(--muted);white-space:nowrap}
.row-actions{display:flex;align-items:center;gap:4px;opacity:0;transition:opacity .15s}
.row:hover .row-actions{opacity:1}
.minibtn{
  background:none;border:none;color:var(--muted);font-size:13px;cursor:pointer;padding:4px 6px;
  border-radius:6px;text-decoration:none;line-height:1;font-family:inherit;transition:all .12s
}
.minibtn:hover{background:var(--accent-soft);color:var(--accent)}

/* ---------- forms (settings/edit) ---------- */
.field-label{display:block;font-size:12.5px;font-weight:600;margin:16px 0 6px}
.sec{font-size:14.5px;font-weight:700;margin:22px 0 0;padding-top:16px;border-top:1px solid var(--line)}
.sec:first-of-type{border-top:none;padding-top:0;margin-top:4px}
.textinput{
  width:100%;border:1px solid var(--line);border-radius:10px;padding:11px 13px;font-size:14.5px;
  font-family:inherit;background:#f7f9fd;color:var(--ink)
}
.textinput:focus{outline:none;border-color:var(--accent);background:#fff}
.hint{font-size:12.5px;color:var(--muted);line-height:1.6;margin:8px 0;background:#f7f9fd;
  border:1px solid var(--line);border-radius:10px;padding:12px 14px}
.hint code{background:#e7eefb;border-radius:4px;padding:1px 5px;font-size:12px}
.two-col{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.cancel{display:block;text-align:center;margin-top:12px;font-size:13.5px;color:var(--muted);text-decoration:none}
.cancel:hover{color:var(--accent)}
.linkbtn{background:none;border:none;color:var(--muted);font-size:12.5px;cursor:pointer;
  font-family:inherit;text-decoration:underline;padding:0}

/* ---------- month grid (edit) ---------- */
.month-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;margin:10px 0 4px}
.month-cell{
  display:flex;align-items:center;gap:6px;border:1px solid var(--line);border-radius:9px;
  padding:9px 10px;font-size:12.5px;cursor:pointer;background:#f7f9fd;transition:all .13s;user-select:none
}
.month-cell input{margin:0;accent-color:var(--accent)}
.month-cell.sel{background:var(--accent-soft);border-color:var(--accent);font-weight:600}

/* ---------- flash ---------- */
.flash{border-radius:10px;padding:11px 14px;font-size:13.5px;font-weight:500;margin-bottom:14px}
.flash.ok{background:var(--accent-soft);color:var(--accent)}
.flash.err{background:#fbeaea;color:var(--danger)}

/* ---------- modal ---------- */
.overlay{position:fixed;inset:0;background:rgba(0,46,93,.5);display:flex;align-items:flex-start;
  justify-content:center;padding:60px 16px;z-index:50}
.modal-card{width:100%;max-width:560px;box-shadow:var(--shadow)}

/* ---------- footer ---------- */
.foot{text-align:center;padding:16px 18px 20px;margin:0;border-top:1px solid var(--line)}
.foot a,.foot button{color:var(--muted);font-size:12.5px;text-decoration:none;background:none;
  border:none;cursor:pointer}
.foot a:hover,.foot button:hover{color:var(--accent)}

@media(max-width:560px){
  body{padding:16px 10px 48px}
  .month-grid{grid-template-columns:repeat(3,1fr)}
  .two-col{grid-template-columns:1fr}
  .row-actions{opacity:1}
  .sub{display:none}
}