:root{
  --paper:#f2e9d3; --card:#fbf6e8; --ink:#3a2e28; --muted:#7b6b5b; --line:#d3c19d;
  --green:#2e4a3b; --green-ink:#f6eed9; --wine:#8a2f2f; --gold:#c79a2e;
  --soft:#eadfc4; --danger:#8a2f2f; --danger-soft:#f1d9d0;
  --a0:#2e5d6e; --a1:#55713a; --a2:#a8741a; --a3:#8a3b4a; --a4:#5b4a7a; --a5:#a2522f;
  --rule:rgba(46,93,110,.20);
  --radius:6px;
  --shadow:2px 3px 0 rgba(58,46,40,.13);
  --head:'Pridi','Sarabun',Georgia,serif;
  --font:'Sarabun','Pridi',system-ui,-apple-system,'Segoe UI',sans-serif;
}
@media (prefers-color-scheme: dark){
  :root{
    --paper:#1e1914; --card:#2a2219; --ink:#efe3cb; --muted:#b2a287; --line:#4a3d2d;
    --green:#27392f; --green-ink:#f1e6cc; --wine:#e39a8d; --gold:#d9b25a;
    --soft:#3a2f22; --danger:#f0a395; --danger-soft:#43251f;
    --a0:#7db4c6; --a1:#a3c27a; --a2:#e0b25c; --a3:#dd93a2; --a4:#b7a5dc; --a5:#e59a74;
    --rule:rgba(125,180,198,.15);
    --shadow:2px 3px 0 rgba(0,0,0,.35);
  }
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;color:var(--ink);font-family:var(--font);font-size:16px;line-height:1.55;
  background-color:var(--paper);
  background-image:radial-gradient(rgba(120,90,50,.07) 1px,transparent 1px),radial-gradient(rgba(120,90,50,.05) 1px,transparent 1px);
  background-size:5px 5px,9px 9px;background-position:0 0,2px 3px;
  padding:env(safe-area-inset-top) env(safe-area-inset-right) calc(36px + env(safe-area-inset-bottom)) env(safe-area-inset-left)}
[hidden]{display:none !important}
button,input,textarea{font:inherit;color:inherit}
:focus-visible{outline:3px solid var(--gold);outline-offset:2px}
h1,h2,h3,h4{font-family:var(--head)}

/* header */
.top{background:var(--green);color:var(--green-ink);border-bottom:4px double var(--gold)}
.top-in{max-width:1040px;margin:0 auto;padding:14px 16px;display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap}
.brand{display:flex;align-items:center;gap:14px}
.brand-ico{display:grid;place-items:center;width:58px;height:58px;border-radius:50%;border:3px double var(--gold);color:var(--gold);
  font-family:var(--head);font-weight:700;font-size:.95rem;transform:rotate(-8deg);background:rgba(255,255,255,.04)}
.brand h1{margin:0;font-size:1.3rem;line-height:1.25;font-weight:600}
.brand p{margin:0;opacity:.8;font-size:.88rem}
.who{display:flex;align-items:center;gap:8px;flex-wrap:wrap}
.badge{padding:2px 12px;border:1px solid var(--gold);color:var(--gold);border-radius:3px;font-weight:600;font-size:.82rem}
.top .btn.ghost{color:var(--green-ink);border-color:rgba(246,238,217,.45);box-shadow:none}
.top .btn.ghost[aria-pressed="true"]{background:var(--gold);color:#2a2010;border-color:var(--gold)}

.wrap{max-width:1040px;margin:0 auto;padding:18px 16px}

/* buttons */
.btn{border:1px solid var(--ink);border-radius:var(--radius);padding:8px 16px;background:var(--soft);color:var(--ink);font-weight:600;cursor:pointer;
  box-shadow:var(--shadow);transition:transform .08s ease,box-shadow .08s ease}
.btn:hover{filter:brightness(.97)}
.btn:active{transform:translate(2px,3px);box-shadow:none}
.btn.primary{background:var(--green);color:var(--green-ink);border-color:var(--green)}
.btn.ghost{background:transparent;color:var(--ink);border-color:var(--line);box-shadow:none}
.btn.danger{background:var(--danger-soft);color:var(--danger);border-color:var(--danger)}
.btn.small{padding:4px 12px;font-size:.86rem}
.btn.round{width:40px;height:40px;padding:0;font-size:1.3rem;line-height:1;background:var(--card);border-color:var(--line)}
.btn.block{width:100%}
.btn[disabled]{opacity:.6;cursor:wait}

/* week + folder tabs */
.weekbar{display:flex;align-items:center;justify-content:center;gap:10px;margin:0 0 14px}
.tabs{display:grid;grid-template-columns:repeat(5,1fr);gap:4px;border-bottom:2px solid var(--ink);padding:0 2px}
.tab{border:1px solid var(--line);border-bottom:0;cursor:pointer;border-radius:10px 10px 0 0;padding:8px 4px;background:var(--soft);
  display:flex;flex-direction:column;align-items:center;color:var(--muted);font-family:var(--head);font-weight:600;line-height:1.25;position:relative;top:0}
.tab small{font-family:var(--font);font-weight:500;font-size:.76rem}
.tab[aria-selected="true"]{background:var(--card);color:var(--ink);border-color:var(--ink);padding-top:11px;margin-bottom:-2px;border-bottom:2px solid var(--card)}
.tab.today:not([aria-selected="true"]){color:var(--wine);border-color:var(--wine)}
@media (max-width:480px){.tab{font-size:.88rem;padding:7px 2px}}

.dateline{margin:20px 0 12px;font-size:1.2rem;font-weight:600;display:flex;align-items:center;gap:12px}
.dateline::after{content:"";flex:1;border-top:2px dotted var(--line)}

/* roster notice */
.roster{background:var(--card);border:1px solid var(--ink);border-radius:var(--radius);padding:12px 18px 14px;margin-bottom:14px;box-shadow:var(--shadow);
  outline:1px solid var(--wine);outline-offset:-6px}
.roster-head{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:2px 4px 0}
.roster h3{margin:0;font-size:1.02rem;font-weight:600;color:var(--wine)}
.roster-list{list-style:none;margin:8px 0 0;padding:0 4px;display:flex;flex-wrap:wrap;gap:6px 8px}
.roster-list li{border:1px dotted var(--ink);padding:2px 12px;border-radius:3px;font-weight:500;background:var(--paper)}
.roster-list li.empty{border:0;background:transparent;color:var(--muted);padding-left:0}

.copy{width:100%;padding:12px;font-size:1rem;margin-bottom:20px;border:1px solid var(--green);outline:1px solid var(--gold);outline-offset:-5px}

/* period cards */
.periods{display:grid;grid-template-columns:repeat(auto-fill,minmax(290px,1fr));gap:16px}
.card{--c:var(--a0);background:var(--card);border:1px solid var(--ink);border-left:6px solid var(--c);border-radius:var(--radius);box-shadow:var(--shadow);
  padding:12px 16px 14px;display:flex;flex-direction:column;gap:10px}
.card.c0{--c:var(--a0)} .card.c1{--c:var(--a1)} .card.c2{--c:var(--a2)}
.card.c3{--c:var(--a3)} .card.c4{--c:var(--a4)} .card.c5{--c:var(--a5)}
.card-head{display:flex;gap:12px;align-items:flex-start;border-radius:4px}
.pnum{flex:none;width:40px;height:40px;border-radius:50%;border:2px double var(--c);color:var(--c);display:grid;place-items:center;font-family:var(--head);font-weight:700;font-size:1.05rem}
.pinfo{min-width:0;flex:1}
.pname{margin:0;font-size:1.04rem;line-height:1.3;font-weight:600;word-break:break-word}
.pmeta{margin:2px 0 0;color:var(--muted);font-size:.86rem}
.pencil{flex:none;font-size:.78rem;color:var(--c);border:1px dashed var(--c);border-radius:3px;padding:0 8px;white-space:nowrap}
.card-head.editable{cursor:pointer;margin:-4px -6px;padding:4px 6px}
.card-head.editable:hover,.card-head.editable:focus-visible{background:color-mix(in srgb,var(--c) 10%,transparent);outline-offset:0}
.card.free,.card.lunch{background:transparent;box-shadow:none;border:1px dashed var(--line);border-left:6px solid var(--line);padding:10px 16px}
.card.lunch .pnum,.card.free .pnum{border-color:var(--line);color:var(--muted)}
.card.lunch .pname,.card.free .pname{color:var(--muted);font-weight:500}
.card.lunch .card-head.editable,.card.free .card-head.editable{--c:var(--muted)}

/* ruled-paper homework note */
.hw{background:var(--paper);border:1px solid var(--line);border-radius:4px;padding:6px 12px 8px;
  background-image:repeating-linear-gradient(transparent 0 25px,var(--rule) 25px 26px);background-position:0 5px}
.hw.done{opacity:.65}
.hw.done .hw-text{text-decoration:line-through}
.hw-text{margin:0;white-space:pre-wrap;word-break:break-word;line-height:26px}
.hw-foot{display:flex;align-items:center;justify-content:space-between;gap:8px;margin-top:6px;color:var(--muted);font-size:.8rem;background:var(--paper);padding-top:2px}
.check{display:flex;align-items:center;gap:8px;cursor:pointer;font-weight:600;color:var(--ink)}
.check input{width:18px;height:18px;accent-color:var(--green)}
.card-actions{margin-top:auto;display:flex;gap:8px;flex-wrap:wrap}
.btn.add{flex:1;background:var(--c);color:#fff;border-color:var(--c);min-width:140px}
@media (prefers-color-scheme: dark){.btn.add{color:#1b150f}}

.empty-state{grid-column:1/-1;text-align:center;color:var(--muted);padding:30px 0}

/* dialogs */
.dlg{border:1px solid var(--ink);border-radius:var(--radius);padding:22px;width:min(470px,calc(100% - 28px));background:var(--card);color:var(--ink);
  outline:1px solid var(--gold);outline-offset:-7px;box-shadow:6px 8px 0 rgba(0,0,0,.25)}
.dlg::backdrop{background:rgba(40,28,15,.55)}
.dlg h2{margin:0 0 4px;font-size:1.2rem;font-weight:600}
#loginForm{text-align:center}
.muted{color:var(--muted);font-size:.9rem;margin:2px 0 12px}
.lbl{display:block;margin:10px 0 6px;font-weight:600;font-size:.92rem;text-align:left}
.row2{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.field{width:100%;border:1px solid var(--line);border-bottom:2px solid var(--ink);border-radius:3px;padding:9px 12px;background:var(--paper);resize:vertical}
.field:focus{outline:none;border-color:var(--green);box-shadow:0 0 0 3px color-mix(in srgb,var(--gold) 45%,transparent)}
#passcode{text-align:center;font-size:1.25rem;letter-spacing:.3em;margin:10px 0}
.err{min-height:1.4em;margin:6px 0;color:var(--danger);font-size:.9rem}
.dlg-actions{display:flex;gap:8px;align-items:center;margin-top:6px;flex-wrap:wrap}
.spacer{flex:1}
.opt{display:flex;gap:10px;align-items:flex-start;background:var(--paper);border:1px dashed var(--line);border-radius:4px;padding:8px 10px;margin-top:12px;cursor:pointer;font-size:.92rem}
.opt input{width:18px;height:18px;margin-top:3px;accent-color:var(--green);flex:none}

.toast{position:fixed;left:50%;bottom:calc(24px + env(safe-area-inset-bottom));transform:translate(-50%,30px);opacity:0;pointer-events:none;
  background:var(--green);color:var(--green-ink);border:1px solid var(--gold);padding:9px 18px;border-radius:4px;font-weight:600;transition:all .25s ease;z-index:50;max-width:calc(100% - 32px);text-align:center}
.toast.show{opacity:1;transform:translate(-50%,0)}
@media (prefers-reduced-motion:reduce){*{transition:none !important}}