:root {
  --bg: #f6f7f9; --card: #fff; --ink: #14181f; --muted: #667085; --line: #e4e7ec;
  --brand: #0f766e; --brand-ink: #fff; --danger: #b42318; --warn-bg: #fff4e5; --warn-ink: #8a4b00;
  --ok-bg: #e6f4ea; --ok-ink: #17692d; --bad-bg: #fde7e7; --bad-ink: #9b1c1c; --bubble: #d9fdd3;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0e1116; --card: #171b22; --ink: #e7eaf0; --muted: #98a2b3; --line: #2a303a;
    --brand: #2dd4bf; --brand-ink: #04211e; --danger: #f97066; --warn-bg: #3a2a0c; --warn-ink: #ffd089;
    --ok-bg: #12301c; --ok-ink: #8ee6a5; --bad-bg: #3b1616; --bad-ink: #ffb4b4; --bubble: #1f3b2c;
  }
}
* { box-sizing: border-box; }
html, body { margin: 0; background: var(--bg); color: var(--ink); font: 16px/1.45 system-ui, -apple-system, 'Segoe UI', sans-serif; }
body { padding-bottom: 76px; }
body.login { display: grid; place-items: center; min-height: 100vh; padding: 16px; }
main { max-width: 640px; margin: 0 auto; padding: 16px; }
.stack { display: grid; gap: 12px; }
.row { display: flex; gap: 8px; align-items: center; }
.row > label { flex: 1; min-width: 0; }
.row.between { justify-content: space-between; }
.row.end { justify-content: flex-end; }
.row.wrap { flex-wrap: wrap; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 14px; }
h1, h3, h4 { margin: 0; }
h4.day { margin: 8px 0 -4px; color: var(--muted); font-size: 14px; text-transform: uppercase; letter-spacing: .04em; }
.muted { color: var(--muted); } .center { text-align: center; } .err { color: var(--danger); margin: 0; }
label { display: grid; gap: 4px; font-size: 14px; color: var(--muted); }
label.check { display: flex; gap: 8px; align-items: center; }
input, select, textarea, button { font: inherit; font-size: 16px; }
input, select, textarea { width: 100%; padding: 10px 12px; border: 1px solid var(--line); border-radius: 8px; background: var(--card); color: var(--ink); }
input[type=checkbox] { width: auto; }
button { padding: 10px 14px; border-radius: 8px; border: 1px solid var(--line); background: var(--card); color: var(--ink); cursor: pointer; min-height: 44px; }
button.primary { background: var(--brand); color: var(--brand-ink); border-color: var(--brand); font-weight: 600; }
button.danger { color: var(--danger); } button.ghost { border-color: transparent; background: transparent; }
button:disabled { opacity: .5; cursor: default; }
.chip { display: inline-block; padding: 2px 8px; border-radius: 999px; font-size: 12px; background: var(--line); color: var(--ink); }
.chip.s-pending, .chip.s-sending { background: var(--warn-bg); color: var(--warn-ink); }
.chip.s-sent { background: var(--ok-bg); color: var(--ok-ink); }
.chip.s-failed, .chip.s-missed { background: var(--bad-bg); color: var(--bad-ink); }
.msg p { margin: 0; white-space: pre-wrap; overflow-wrap: anywhere; }
.msg[data-status=canceled] { opacity: .6; }
.banner { background: var(--warn-bg); color: var(--warn-ink); padding: 10px 16px; text-align: center; font-size: 14px; }
.bubble { background: var(--bubble); border-radius: 12px 12px 12px 2px; padding: 10px 12px; white-space: pre-wrap; overflow-wrap: anywhere; min-height: 44px; }
nav { position: fixed; left: 0; right: 0; bottom: 0; display: grid; grid-template-columns: repeat(4, 1fr); background: var(--card); border-top: 1px solid var(--line); }
nav a { padding: 14px 4px; text-align: center; color: var(--muted); text-decoration: none; min-height: 52px; }
nav a[aria-current=page] { color: var(--brand); font-weight: 600; }
.grid7 { display: grid; grid-template-columns: repeat(7, 1fr); gap: 4px; margin-top: 8px; }
.grid7.wd span { text-align: center; font-size: 12px; color: var(--muted); }
.cell { position: relative; aspect-ratio: 1; min-height: 40px; padding: 0; border-radius: 8px; }
.cell.empty { border: 0; background: transparent; }
.cell.today { border-color: var(--brand); } .cell.sel { background: var(--brand); color: var(--brand-ink); }
.cell i { position: absolute; right: 4px; bottom: 2px; font-style: normal; font-size: 10px; }
dialog { width: min(92vw, 460px); border: 1px solid var(--line); border-radius: 12px; background: var(--card); color: var(--ink); padding: 16px; }
dialog::backdrop { background: rgba(0, 0, 0, .5); }
dialog > * + * { margin-top: 12px; }
.toast { position: fixed; left: 50%; bottom: 84px; transform: translateX(-50%); background: var(--ink); color: var(--bg); padding: 10px 16px; border-radius: 8px; max-width: 90vw; z-index: 10; }
.toast.bad { background: var(--danger); color: #fff; }
details summary { cursor: pointer; color: var(--muted); }
img { max-width: 100%; height: auto; }