/* Meeting Room Splitter — warm, mobile-first. Light + dark theo hệ thống. */
:root {
  --paper: #faf7f2;
  --card: #ffffff;
  --ink: #2a2622;
  --ink-2: #6b6259;
  --ink-3: #948a7e;
  --line: #ece5da;
  --line-2: #ddd3c5;
  --accent: #c2410c;      /* burnt orange */
  --accent-soft: #fdeee4;
  --accent-ink: #9a3009;
  --ok: #3f7d4e;
  --ok-soft: #e9f3ea;
  --danger: #b4402f;
  --shadow: 0 1px 2px rgba(58,44,30,.05), 0 8px 24px rgba(58,44,30,.06);
  --radius: 16px;
  --font-head: 'Be Vietnam Pro', system-ui, sans-serif;
  --font-body: system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
}
@media (prefers-color-scheme: dark) {
  :root {
    --paper: #1a1613;
    --card: #241f1b;
    --ink: #f2ede6;
    --ink-2: #b7ada0;
    --ink-3: #8a8074;
    --line: #332c26;
    --line-2: #40382f;
    --accent: #f0803f;
    --accent-soft: #37241a;
    --accent-ink: #f7a875;
    --ok: #6fbf82;
    --ok-soft: #1e2a20;
    --danger: #e0715f;
    --shadow: 0 1px 2px rgba(0,0,0,.2), 0 8px 24px rgba(0,0,0,.28);
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.5;
  padding: env(safe-area-inset-top) env(safe-area-inset-right) env(safe-area-inset-bottom) env(safe-area-inset-left);
}
.wrap {
  max-width: 520px;
  margin: 0 auto;
  padding: 20px 16px 64px;
}

/* Header */
.head { display: flex; align-items: flex-start; justify-content: space-between; gap: 12px; margin: 4px 0 20px; }
.head-title { display: flex; gap: 12px; align-items: flex-start; }
.logo { font-size: 30px; line-height: 1; margin-top: 2px; }
h1 { font-family: var(--font-head); font-weight: 500; font-size: 22px; line-height: 1.2; margin: 0; letter-spacing: -.01em; }
.sub { margin: 3px 0 0; color: var(--ink-2); font-size: 13.5px; }

/* Cards */
.card, .result {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 18px 16px;
  margin-bottom: 14px;
}
.field-label { display: block; font-family: var(--font-head); font-weight: 500; font-size: 14px; color: var(--ink); margin-bottom: 8px; }
.field-label-mt { margin-top: 16px; }
.opt { color: var(--ink-3); font-weight: 400; }
.field-head { display: flex; align-items: baseline; justify-content: space-between; }
.count { color: var(--ink-2); font-size: 13px; }

/* Inputs */
.input {
  width: 100%;
  font: inherit;
  color: var(--ink);
  background: var(--paper);
  border: 1.5px solid var(--line-2);
  border-radius: 12px;
  padding: 12px 14px;
  outline: none;
  transition: border-color .15s, box-shadow .15s;
}
.input::placeholder { color: var(--ink-3); }
.input:focus { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }
.input-money { font-family: var(--font-head); font-weight: 500; font-size: 20px; font-variant-numeric: tabular-nums; }
.textarea { resize: vertical; min-height: 96px; line-height: 1.6; }

.echo { min-height: 18px; margin-top: 6px; color: var(--ink-2); font-size: 13px; font-variant-numeric: tabular-nums; }
.echo strong { color: var(--accent-ink); font-weight: 600; }
.err { color: var(--danger); font-size: 13px; margin-top: 6px; min-height: 0; }
.err:empty { display: none; }
.hint { color: var(--ink-2); font-size: 13px; margin-top: 8px; }
.hint:empty { display: none; }

/* Chips (parsed people) */
.chips { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 12px; }
.chip {
  display: inline-flex; align-items: center; gap: 6px;
  background: var(--paper); border: 1px solid var(--line-2);
  border-radius: 999px; padding: 6px 8px 6px 12px; font-size: 14px;
}
.chip-x {
  border: none; background: var(--line); color: var(--ink-2);
  width: 20px; height: 20px; border-radius: 999px; cursor: pointer;
  font-size: 14px; line-height: 1; display: grid; place-items: center; padding: 0;
}
.chip-x:hover { background: var(--danger); color: #fff; }

.btn-link { background: none; border: none; color: var(--accent-ink); font: inherit; font-size: 13.5px; padding: 10px 0 0; cursor: pointer; text-decoration: underline; text-underline-offset: 2px; }

/* Payer radio list */
.payer-list { display: flex; flex-wrap: wrap; gap: 8px; }
.payer-opt {
  display: inline-flex; align-items: center; gap: 8px;
  border: 1.5px solid var(--line-2); border-radius: 12px;
  padding: 10px 14px; cursor: pointer; font-size: 15px; user-select: none;
  transition: border-color .15s, background .15s;
}
.payer-opt input { accent-color: var(--accent); width: 18px; height: 18px; margin: 0; }
.payer-opt:hover { border-color: var(--accent); }
.payer-opt.sel { border-color: var(--accent); background: var(--accent-soft); color: var(--accent-ink); font-weight: 500; }

/* Result */
.result { padding-top: 6px; }
.result-head { display: flex; align-items: center; justify-content: space-between; padding: 12px 0 6px; }
h2 { font-family: var(--font-head); font-weight: 500; font-size: 18px; margin: 0; }
.badge { font-size: 12.5px; color: var(--ok); background: var(--ok-soft); padding: 3px 10px; border-radius: 999px; font-weight: 500; }
.block { padding: 14px 0; border-top: 1px solid var(--line); }
.block-title { font-family: var(--font-head); font-weight: 500; font-size: 13px; color: var(--ink-2); text-transform: uppercase; letter-spacing: .04em; margin-bottom: 10px; }
.rows { display: flex; flex-direction: column; gap: 2px; }
.row {
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  padding: 10px 12px; border-radius: 10px;
}
.row:nth-child(odd) { background: var(--paper); }
.row .nm { font-size: 15px; }
.row .amt { font-family: var(--font-head); font-weight: 500; font-variant-numeric: tabular-nums; font-size: 15px; }
.row .tag { font-size: 11.5px; color: var(--accent-ink); background: var(--accent-soft); padding: 2px 7px; border-radius: 999px; margin-left: 8px; }
.rows-pay .row .amt { color: var(--accent-ink); }
.rows-pay .nm .to { color: var(--ink-2); }

.note-round { font-size: 13px; color: var(--ink-2); background: var(--accent-soft); border-radius: 10px; padding: 10px 12px; margin: 10px 0 0; }
.total-check {
  display: flex; align-items: center; justify-content: space-between;
  margin-top: 12px; padding: 10px 12px; border-radius: 10px;
  background: var(--ok-soft); color: var(--ok); font-weight: 500; font-size: 14px;
  font-variant-numeric: tabular-nums;
}

/* Buttons */
.actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 18px; }
.btn {
  flex: 1 1 auto; min-width: 130px;
  font-family: var(--font-head); font-weight: 500; font-size: 15px;
  border: none; border-radius: 12px; padding: 13px 16px; cursor: pointer;
  background: var(--accent); color: #fff; transition: filter .15s, transform .05s;
}
.btn:hover { filter: brightness(1.05); }
.btn:active { transform: translateY(1px); }
.btn-2 { background: var(--paper); color: var(--ink); border: 1.5px solid var(--line-2); }
.btn-2:hover { border-color: var(--accent); color: var(--accent-ink); filter: none; }
.btn-danger { background: var(--danger); flex: 0 0 auto; }
.btn-ghost { background: none; border: 1px solid var(--line-2); color: var(--ink-2); font: inherit; font-size: 13.5px; border-radius: 10px; padding: 8px 14px; cursor: pointer; }
.btn-ghost:hover { border-color: var(--danger); color: var(--danger); }

.foot { color: var(--ink-3); font-size: 12px; text-align: center; margin-top: 22px; line-height: 1.5; }

/* Toast */
.toast {
  position: fixed; left: 50%; bottom: 22px; transform: translateX(-50%);
  background: var(--ink); color: var(--paper); border-radius: 12px;
  padding: 12px 16px; display: flex; align-items: center; gap: 14px;
  box-shadow: 0 10px 30px rgba(0,0,0,.25); font-size: 14px; z-index: 40;
  max-width: calc(100vw - 32px);
}
.toast-action { background: none; border: none; color: var(--accent); font: inherit; font-weight: 600; cursor: pointer; padding: 0; white-space: nowrap; }

/* Modal */
.modal { position: fixed; inset: 0; background: rgba(30,22,15,.45); display: grid; place-items: center; padding: 20px; z-index: 50; }
.modal-card { background: var(--card); border-radius: var(--radius); padding: 22px; max-width: 380px; width: 100%; box-shadow: var(--shadow); }
.modal-card h3 { font-family: var(--font-head); font-weight: 500; margin: 0 0 8px; font-size: 18px; }
.modal-card p { margin: 0 0 18px; color: var(--ink-2); font-size: 14px; }
.modal-actions { display: flex; justify-content: flex-end; gap: 10px; }

[hidden] { display: none !important; }

/* Tablet/desktop: vẫn 1 cột hẹp, chỉ nới nhẹ */
@media (min-width: 700px) {
  .wrap { padding-top: 40px; }
  h1 { font-size: 24px; }
}