:root {
  --bg: #f4f5f7;
  --card: #ffffff;
  --text: #1c2430;
  --muted: #68727f;
  --line: #e3e6ea;
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --danger: #dc2626;
  --u1: #dc2626; /* ด่วน-รีบ */
  --u2: #ea580c; /* ด่วน-ไม่รีบ */
  --u3: #d97706; /* ไม่ด่วน-รีบ */
  --u4: #64748b; /* ไม่ด่วน-ไม่รีบ */
  --radius: 12px;
  --shadow: 0 1px 3px rgba(16, 24, 40, 0.08);
}

* { box-sizing: border-box; }

html, body {
  overflow-x: hidden;
}

body {
  margin: 0;
  font-family: 'Noto Sans Thai', -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: 15px;
}

.hidden { display: none !important; }

/* ---- PIN ---- */
.pin-screen {
  position: fixed; inset: 0; z-index: 50;
  background: var(--bg);
  display: flex; align-items: center; justify-content: center;
  padding: 24px;
}
.pin-box {
  background: var(--card); border-radius: 16px; box-shadow: var(--shadow);
  padding: 32px 28px; width: 100%; max-width: 340px; text-align: center;
  display: flex; flex-direction: column; gap: 12px;
}
.pin-box h1 { margin: 0; font-size: 24px; }
.pin-box p { margin: 0; color: var(--muted); }
.pin-box input {
  font-size: 22px; text-align: center; letter-spacing: 6px;
  padding: 10px; border: 1px solid var(--line); border-radius: 10px;
}

/* ---- Layout ---- */
.app { max-width: 720px; margin: 0 auto; padding: 16px 16px 96px; }

.topbar h1 { font-size: 22px; margin: 4px 0 12px; }

.filters {
  display: grid; grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px; padding-bottom: 8px;
}
@media (min-width: 600px) {
  .filters { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}
.filters select {
  width: 100%; min-width: 0;
  font-family: inherit; font-size: 13px;
  padding: 7px 10px; border: 1px solid var(--line); border-radius: 999px;
  background: var(--card); color: var(--text);
}

/* ---- Sections ---- */
.section { margin-top: 20px; }
.section-head {
  display: flex; align-items: center; gap: 8px;
  font-size: 14px; font-weight: 700; color: var(--muted);
  margin-bottom: 8px; cursor: default;
}
.section-head .count {
  background: var(--line); border-radius: 999px; font-size: 12px;
  padding: 1px 8px; font-weight: 600;
}
.section.overdue .section-head { color: var(--danger); }
.section.done-section .section-head { cursor: pointer; user-select: none; }

.empty-board {
  text-align: center; color: var(--muted); margin-top: 64px; font-size: 15px;
}

/* ---- Task card ---- */
.card {
  background: var(--card); border-radius: var(--radius); box-shadow: var(--shadow);
  border-left: 4px solid var(--line);
  padding: 12px 14px; margin-bottom: 8px;
  display: flex; gap: 12px; align-items: flex-start;
  cursor: pointer;
}
.card.u-1 { border-left-color: var(--u1); }
.card.u-2 { border-left-color: var(--u2); }
.card.u-3 { border-left-color: var(--u3); }
.card.u-4 { border-left-color: var(--u4); }

.card input[type="checkbox"] {
  width: 20px; height: 20px; margin-top: 2px; flex: 0 0 auto;
  accent-color: var(--primary); cursor: pointer;
}
.card-body { flex: 1; min-width: 0; }
.card-title { font-weight: 600; line-height: 1.35; overflow-wrap: anywhere; }
.card.is-done .card-title { text-decoration: line-through; color: var(--muted); font-weight: 500; }
.card-tags { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 6px; }

.chip {
  font-size: 12px; border-radius: 999px; padding: 2px 9px; font-weight: 600;
  background: #eef1f5; color: var(--muted);
}
.chip.urgency { color: #fff; }
.chip.urgency.u-1 { background: var(--u1); }
.chip.urgency.u-2 { background: var(--u2); }
.chip.urgency.u-3 { background: var(--u3); }
.chip.urgency.u-4 { background: var(--u4); }

.card-dates { margin-top: 6px; font-size: 12.5px; color: var(--muted); display: flex; flex-wrap: wrap; gap: 10px; }
.card-dates .overdue-text { color: var(--danger); font-weight: 700; }

/* ---- FAB ---- */
.fab {
  position: fixed; right: 20px; bottom: 24px; z-index: 30;
  width: 58px; height: 58px; border-radius: 50%;
  background: var(--primary); color: #fff; border: none;
  cursor: pointer; padding: 0;
  display: flex; align-items: center; justify-content: center;
  box-shadow: 0 4px 14px rgba(37, 99, 235, 0.4);
}
.fab svg { display: block; }
.fab:active { background: var(--primary-dark); }

/* ---- Modal ---- */
.modal-backdrop {
  position: fixed; inset: 0; z-index: 40;
  background: rgba(15, 23, 42, 0.45);
  display: flex; align-items: flex-end; justify-content: center;
}
.modal {
  background: var(--card); width: 100%; max-width: 560px;
  border-radius: 16px 16px 0 0; padding: 20px 20px 28px;
  max-height: 92vh; overflow-y: auto;
  display: flex; flex-direction: column; gap: 12px;
}
@media (min-width: 600px) {
  .modal-backdrop { align-items: center; padding: 24px; }
  .modal { border-radius: 16px; }
}
.modal h2 { margin: 0 0 4px; font-size: 18px; }
.modal label { display: flex; flex-direction: column; gap: 5px; font-size: 13px; font-weight: 600; color: var(--muted); }
.modal input[type="text"], .modal input[name="title"], .modal input[type="date"],
.modal textarea, .modal select {
  font-family: inherit; font-size: 15px; color: var(--text);
  padding: 9px 11px; border: 1px solid var(--line); border-radius: 10px; background: #fff;
  width: 100%; min-width: 0;
}
.modal label { min-width: 0; }
.modal input[type="date"] { -webkit-appearance: none; appearance: none; }
.grid2 > label { min-width: 0; }
.modal textarea { resize: vertical; }
.req { color: var(--danger); }
.row { display: flex; gap: 8px; }
.row select { flex: 1; }
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }

.urgency-picker { border: none; padding: 0; margin: 0; display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.urgency-picker legend { font-size: 13px; font-weight: 600; color: var(--muted); margin-bottom: 6px; padding: 0; }
.urgency-picker .u { position: relative; }
.urgency-picker input { position: absolute; opacity: 0; }
.urgency-picker .u span {
  display: block; text-align: center; font-size: 13.5px; font-weight: 600;
  border: 1.5px solid var(--line); border-radius: 10px; padding: 8px 4px;
  color: var(--muted); cursor: pointer;
}
.urgency-picker .u-1 input:checked + span { background: var(--u1); border-color: var(--u1); color: #fff; }
.urgency-picker .u-2 input:checked + span { background: var(--u2); border-color: var(--u2); color: #fff; }
.urgency-picker .u-3 input:checked + span { background: var(--u3); border-color: var(--u3); color: #fff; }
.urgency-picker .u-4 input:checked + span { background: var(--u4); border-color: var(--u4); color: #fff; }

.meta-line { margin: 0; font-size: 12.5px; color: var(--muted); }
.error-text { margin: 0; font-size: 13px; color: var(--danger); min-height: 1em; }

.modal-actions { display: flex; gap: 8px; align-items: center; margin-top: 4px; }
.spacer { flex: 1; }

.btn {
  font-family: inherit; font-size: 14.5px; font-weight: 600;
  border-radius: 10px; padding: 9px 16px; border: none; cursor: pointer;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:active { background: var(--primary-dark); }
.btn-ghost { background: #eef1f5; color: var(--text); }
.btn-danger { background: #fee2e2; color: var(--danger); }

/* ---- Detail view ---- */
.view-title { margin: 0; font-size: 18px; line-height: 1.4; overflow-wrap: anywhere; }
.view-chips { display: flex; flex-wrap: wrap; gap: 6px; }
.view-details {
  background: var(--bg); border-radius: 10px; padding: 12px;
  font-size: 14.5px; line-height: 1.6; white-space: pre-wrap; overflow-wrap: anywhere;
}
.view-details:empty { display: none; }
.view-rows { display: flex; flex-direction: column; gap: 6px; }
.view-row { display: flex; gap: 10px; font-size: 14px; }
.view-row .k { color: var(--muted); flex: 0 0 110px; }
.view-row .v { flex: 1; min-width: 0; overflow-wrap: anywhere; }
.view-row .v.overdue-text { color: var(--danger); font-weight: 700; }

/* ---- Toast ---- */
.toast {
  position: fixed; left: 50%; bottom: 96px; transform: translateX(-50%);
  background: #1c2430; color: #fff; font-size: 14px;
  padding: 10px 18px; border-radius: 999px; z-index: 60;
  box-shadow: 0 4px 14px rgba(0,0,0,0.25);
  max-width: 90vw; text-align: center;
}