:root {
  --bg: #f4f6fa;
  --surface: #ffffff;
  --column: #eaeef5;
  --text: #1d2433;
  --muted: #5f6b7f;
  --border: #dfe3eb;
  --border-strong: #c3cad6;
  --primary: #0e3a80;
  --primary-hover: #0b2f68;
  --on-primary: #ffffff;
  --danger: #c43c3c;
  --today: rgba(14, 58, 128, 0.07);
  --warning-bg: #fff4d6;
  --warning-text: #6b4d00;
  --off-day: #f1f3f7;
  --overdue: #c43c3c;
  --radius: 10px;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #11151c;
    --surface: #1a1f29;
    --column: #151a22;
    --text: #e6e9ef;
    --muted: #9aa4b5;
    --border: #2c3341;
    --border-strong: #3d4657;
    --primary: #5b8def;
    --primary-hover: #7aa3f2;
    --on-primary: #0b1220;
    --danger: #e06666;
    --today: rgba(91, 141, 239, 0.14);
    --warning-bg: #3a3017;
    --warning-text: #f2d48a;
    --off-day: #151a22;
    --overdue: #ef7a7a;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }

html, body { margin: 0; }

body {
  height: 100dvh;
  display: flex;
  flex-direction: column;
  background: var(--bg);
  color: var(--text);
  font-family: "IBM Plex Sans Thai", system-ui, -apple-system, "Segoe UI", sans-serif;
  font-size: 15px;
}

[hidden] { display: none !important; }

/* ---------- top bar ---------- */

.topbar {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px 20px;
  padding: 10px 16px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}

.brand { display: flex; align-items: center; gap: 10px; }
.brand-logo { height: 30px; width: 30px; }
.brand h1 { margin: 0; font-size: 18px; font-weight: 600; white-space: nowrap; }

.topbar-actions {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px 14px;
  margin-left: auto;
}

.search {
  font: inherit;
  padding: 6px 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
  color: var(--text);
  width: 170px;
}

/* "More" dropdown menu */
.menu { position: relative; }
.menu > summary { list-style: none; }
.menu > summary::-webkit-details-marker { display: none; }
.menu-list {
  position: absolute;
  right: 0;
  top: calc(100% + 6px);
  z-index: 20;
  min-width: 220px;
  display: flex;
  flex-direction: column;
  padding: 6px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.14);
}
.menu-list button {
  font: inherit;
  text-align: left;
  padding: 8px 10px;
  border: 0;
  border-radius: 6px;
  background: none;
  color: var(--text);
  cursor: pointer;
}
.menu-list button:hover { background: var(--bg); }

#planFilter {
  font: inherit;
  padding: 6px 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
  color: var(--text);
  max-width: 200px;
}

.banner {
  padding: 8px 16px;
  background: var(--warning-bg);
  color: var(--warning-text);
  font-size: 14px;
}
.banner-info { display: flex; align-items: center; flex-wrap: wrap; gap: 8px 12px; }
.banner-info span { flex: 1; min-width: 200px; }

.print-header { display: none; }

main {
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  padding: 16px;
}

.view { height: 100%; }

.panel, #calendar {
  height: 100%;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px;
}

.empty { margin: 0; padding: 16px 4px; color: var(--muted); font-size: 14px; text-align: center; }
.hint { color: var(--muted); font-size: 13px; }

/* ---------- controls ---------- */

.btn {
  font: inherit;
  padding: 7px 14px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
  white-space: nowrap;
}
.btn:hover { background: var(--bg); }
.btn-primary { background: var(--primary); border-color: var(--primary); color: var(--on-primary); }
.btn-primary:hover { background: var(--primary-hover); border-color: var(--primary-hover); }
.btn-danger { color: var(--danger); border-color: var(--danger); }
.btn-small { padding: 4px 10px; font-size: 13px; }
.btn-icon { padding: 2px 10px; font-size: 18px; line-height: 1.2; }

.check { display: inline-flex; align-items: center; gap: 6px; cursor: pointer; color: var(--muted); }

/* Segmented control: view tabs and Gantt scale */
.tabs, .segmented {
  display: inline-flex;
  padding: 3px;
  gap: 2px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 10px;
}
.tabs button, .segmented button {
  font: inherit;
  padding: 5px 14px;
  border: 0;
  border-radius: 7px;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
}
.tabs button:hover, .segmented button:hover { color: var(--text); }
.tabs button[aria-selected="true"],
.segmented button[aria-pressed="true"] {
  background: var(--surface);
  color: var(--text);
  font-weight: 500;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.12);
}

.dot {
  display: inline-block;
  flex: none;
  width: 9px;
  height: 9px;
  border-radius: 50%;
}
.dot-lg { width: 14px; height: 14px; }

/* ---------- dialogs ---------- */

dialog {
  width: min(520px, calc(100vw - 32px));
  max-height: calc(100dvh - 32px);
  padding: 20px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--surface);
  color: var(--text);
}
dialog::backdrop { background: rgba(10, 15, 25, 0.45); }
dialog h2 { margin: 0 0 16px; font-size: 18px; }
dialog h3 { margin: 0; font-size: 15px; }

form { display: flex; flex-direction: column; gap: 12px; }

.row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 12px;
}

.field { display: flex; flex-direction: column; gap: 4px; }
.field > span { font-size: 13px; color: var(--muted); }
.field input, .field select, .field textarea {
  font: inherit;
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg);
  color: var(--text);
}
.field textarea { resize: vertical; }
.field input:focus, .field select:focus, .field textarea:focus {
  outline: 2px solid var(--primary);
  outline-offset: -1px;
}
.field input[type="range"] { padding: 0; border: 0; background: none; accent-color: var(--primary); }
.field input[type="color"] { height: 40px; padding: 3px; cursor: pointer; }
#progressOut { color: var(--text); font-weight: 500; }

form.all-day .time-field { display: none; }

.form-error { margin: 0; color: var(--danger); font-size: 14px; }

.dialog-actions { display: flex; gap: 8px; margin-top: 4px; }
.spacer { flex: 1; }

.dialog-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 12px; }
.dialog-head h2 { margin: 0; }

.plan-list { list-style: none; margin: 0 0 16px; padding: 0; display: flex; flex-direction: column; gap: 6px; }
.plan-list li {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
}
.plan-info { flex: 1; min-width: 0; display: flex; flex-direction: column; }
.plan-info small { color: var(--muted); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

#planForm, #dayForm { padding-top: 14px; border-top: 1px solid var(--border); }

.dialog-wide { width: min(620px, calc(100vw - 32px)); }
.dialog-section { margin-bottom: 16px; }
.dialog-section h3 { margin-bottom: 8px; }
.section-head { display: flex; align-items: center; justify-content: space-between; gap: 8px; margin-bottom: 8px; }
.section-head h3 { margin: 0; }
#dayList { max-height: 260px; overflow-y: auto; margin-bottom: 0; }

.weekdays { display: flex; flex-wrap: wrap; gap: 6px; }
.weekday {
  padding: 4px 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
}
.weekday:has(input:checked) { background: var(--bg); border-color: var(--border-strong); }

/* Task color swatches */
fieldset.field { border: 0; margin: 0; padding: 0; min-width: 0; }
.swatches { display: flex; flex-wrap: wrap; align-items: center; gap: 6px; }
.swatch { position: relative; cursor: pointer; }
.swatch input[type="radio"] { position: absolute; opacity: 0; pointer-events: none; }
.swatch > span {
  display: block;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  border: 2px solid var(--surface);
  box-shadow: 0 0 0 1px var(--border);
}
.swatch input[type="radio"]:checked + span,
.swatch-custom:has(input[type="radio"]:checked) input[type="color"] {
  box-shadow: 0 0 0 2px var(--text);
}
.swatch input[type="radio"]:focus-visible + span { outline: 2px solid var(--primary); outline-offset: 2px; }
.swatch-auto > span {
  width: auto;
  height: 26px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 0 10px 0 6px;
  border-radius: 13px;
  background: var(--bg);
  font-size: 13px;
  color: var(--text);
}
.auto-dot { display: inline-block; width: 14px; height: 14px; border-radius: 50%; }
.swatch-custom input[type="color"] {
  width: 30px;
  height: 30px;
  padding: 0;
  border: 0;
  border-radius: 50%;
  background: none;
  cursor: pointer;
  box-shadow: 0 0 0 1px var(--border);
}
.swatch-custom input[type="color"]::-webkit-color-swatch-wrapper { padding: 2px; }
.swatch-custom input[type="color"]::-webkit-color-swatch { border: 0; border-radius: 50%; }

/* Occurrence of a recurring task */
.occurrence {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border-radius: 8px;
  background: var(--today);
  font-weight: 500;
  cursor: pointer;
}

/* Repeat options */
.repeat-box { display: flex; flex-direction: column; gap: 8px; }
.repeat-box .row { grid-template-columns: repeat(auto-fit, minmax(130px, 1fr)); }
form:not([data-repeat="daily"]):not([data-repeat="weekly"]):not([data-repeat="monthly"]):not([data-repeat="yearly"]) .repeat-opt,
form:not([data-repeat="weekly"]) .repeat-weekly { display: none; }
.repeat-box input[type="number"] { width: 100%; }

/* Checklist */
.checklist { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 4px; }
.checklist li { display: flex; align-items: center; gap: 8px; }
.checklist input[type="checkbox"] { width: 18px; height: 18px; accent-color: var(--primary); flex: none; }
.field .checklist-text {
  flex: 1;
  min-width: 0;
  font: inherit;
  padding: 5px 8px;
  border: 1px solid transparent;
  border-radius: 6px;
  background: transparent;
  color: var(--text);
}
.field .checklist-text:hover, .field .checklist-text:focus { border-color: var(--border); background: var(--bg); outline: none; }
.checklist li.is-checked .checklist-text { text-decoration: line-through; color: var(--muted); }
.btn-x {
  flex: none;
  width: 28px;
  height: 28px;
  border: 0;
  border-radius: 6px;
  background: none;
  color: var(--muted);
  font-size: 18px;
  cursor: pointer;
}
.btn-x:hover { background: var(--bg); color: var(--danger); }
.checklist-add { display: flex; gap: 8px; }
.field .checklist-add input {
  flex: 1;
  min-width: 0;
  font: inherit;
  padding: 7px 10px;
  border: 1px dashed var(--border-strong);
  border-radius: 8px;
  background: var(--bg);
  color: var(--text);
}
#progressAuto { color: var(--muted); font-weight: 400; }

/* Dependencies */
.deps { border: 1px solid var(--border); border-radius: 8px; padding: 8px 12px; }
.deps > summary { cursor: pointer; color: var(--muted); font-size: 14px; }
.deps[open] > summary { margin-bottom: 8px; }
.deps .hint { margin: 0 0 8px; }
.deps .search { width: 100%; margin-bottom: 6px; }
.deps-list { list-style: none; margin: 0; padding: 0; max-height: 180px; overflow-y: auto; }
.deps-list li { padding: 3px 0; }
.deps-list .check { color: var(--text); align-items: flex-start; }
.deps-list .dot { margin-top: 6px; }
.deps-list small { color: var(--muted); }

.date-hint { margin: -4px 0 0; font-size: 13px; color: var(--muted); }
.date-hint.warn { color: var(--warning-text); background: var(--warning-bg); padding: 6px 10px; border-radius: 8px; margin: 0; }
.row-plan { grid-template-columns: 1fr 72px; }

/* ---------- board ---------- */

.board {
  height: 100%;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.column {
  display: flex;
  flex-direction: column;
  min-height: 0;
  background: var(--column);
  border: 2px solid transparent;
  border-radius: var(--radius);
}
.column.drop-target { border-color: var(--primary); }

.column-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 12px 6px;
}
.column-head h2 { margin: 0; font-size: 15px; font-weight: 600; }
.count { margin-left: 4px; color: var(--muted); font-weight: 400; }

.column-body {
  flex: 1;
  overflow-y: auto;
  padding: 4px 10px 10px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.card {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 10px 12px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-left: 4px solid var(--border);
  border-radius: 8px;
  cursor: grab;
}
.card:hover { border-color: var(--border-strong); }
.card:focus-visible { outline: 2px solid var(--primary); }
.card.dragging { opacity: 0.5; }
.card-title { display: flex; align-items: baseline; gap: 8px; font-weight: 500; overflow-wrap: anywhere; }
.card-meta { color: var(--muted); font-size: 13px; }
.card-meta.overdue { color: var(--overdue); font-weight: 500; }
.chips { display: flex; flex-wrap: wrap; gap: 6px; }
.chips:empty { display: none; }
.chip-ok { color: #2e9e6b; }
.chip {
  align-self: flex-start;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 2px 8px;
  border-radius: 999px;
  background: var(--bg);
  font-size: 12px;
  color: var(--muted);
}
.progress { height: 4px; border-radius: 2px; background: var(--column); overflow: hidden; }
.progress > div { height: 100%; background: var(--primary); }
.column[data-status="done"] .card-title { text-decoration: line-through; color: var(--muted); }

/* ---------- summary ---------- */

.summary { max-width: 1200px; margin: 0 auto; }
.summary-date { margin: 0 0 12px; color: var(--muted); }
.summary-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 12px;
}
.summary-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-top: 3px solid var(--border-strong);
  border-radius: var(--radius);
  padding: 12px 14px;
}
.summary-card.tone-danger { border-top-color: var(--overdue); }
.summary-card.tone-primary { border-top-color: var(--primary); }
.summary-card header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 8px; }
.summary-card h2 { margin: 0; font-size: 15px; font-weight: 600; }
.summary-count { font-size: 20px; font-weight: 600; }
.tone-danger .summary-count { color: var(--overdue); }
.summary-card ul { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 2px; }
.summary-card .empty { text-align: left; padding: 4px 0; }
.summary-item, .summary-day {
  width: 100%;
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 6px 8px;
  border: 0;
  border-radius: 6px;
  background: none;
  color: var(--text);
  font: inherit;
  text-align: left;
}
.summary-item { cursor: pointer; }
.summary-item:hover { background: var(--bg); }
.summary-title { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.summary-meta { color: var(--muted); font-size: 13px; white-space: nowrap; }
.summary-more { margin: 6px 8px 0; color: var(--muted); font-size: 13px; }
.plan-progress { padding: 6px 8px; }
.plan-progress-head { display: flex; justify-content: space-between; gap: 8px; margin-bottom: 6px; }
.plan-progress .progress { height: 6px; }

/* ---------- gantt ---------- */

#view-gantt .panel { display: flex; flex-direction: column; gap: 10px; }
.gantt-toolbar { display: flex; align-items: center; flex-wrap: wrap; gap: 10px; }
#gantt { flex: 1; min-height: 0; }

#view-gantt {
  --g-arrow-color: var(--muted);
  --g-bar-color: var(--bg);
  --g-bar-border: var(--primary);
  --g-tick-color: var(--border);
  --g-tick-color-thick: var(--border-strong);
  --g-actions-background: var(--bg);
  --g-border-color: var(--border);
  --g-text-muted: var(--muted);
  --g-text-light: var(--on-primary);
  --g-text-dark: var(--text);
  --g-progress-color: var(--primary);
  --g-handle-color: var(--muted);
  --g-weekend-label-color: var(--border);
  --g-header-background: var(--surface);
  --g-row-color: var(--surface);
  --g-row-border-color: var(--border);
  --g-today-highlight: var(--primary);
  --g-popup-actions: var(--bg);
  --g-weekend-highlight-color: var(--bg);
}
.gantt-container { font-family: inherit; }
.gantt .bar-label { font-family: inherit; }
.gantt .bar-wrapper.is-done { opacity: 0.55; }
.gantt .bar-wrapper.is-done .bar-label { text-decoration: line-through; }
.gantt-container .popup-wrapper .action-btn { color: var(--text); cursor: pointer; font: inherit; font-size: 13px; }

/* ---------- FullCalendar theme ---------- */

.fc {
  --fc-border-color: var(--border);
  --fc-page-bg-color: var(--surface);
  --fc-neutral-bg-color: var(--bg);
  --fc-list-event-hover-bg-color: var(--bg);
  --fc-today-bg-color: var(--today);
  --fc-now-indicator-color: var(--danger);
  --fc-button-text-color: var(--text);
  --fc-button-bg-color: var(--surface);
  --fc-button-border-color: var(--border);
  --fc-button-hover-bg-color: var(--bg);
  --fc-button-hover-border-color: var(--border);
  --fc-button-active-bg-color: var(--primary);
  --fc-button-active-border-color: var(--primary);
}
.fc .fc-button { font-size: 14px; }
.fc .fc-button-primary:not(:disabled).fc-button-active { color: var(--on-primary); }
.fc .fc-button-primary:focus,
.fc .fc-button-primary:not(:disabled):active:focus { box-shadow: 0 0 0 2px var(--today); }
.fc .fc-toolbar-title { font-size: 20px; font-weight: 600; }
.fc .fc-header-toolbar { flex-wrap: wrap; gap: 8px; }
.fc a { color: inherit; }
.fc .fc-event { cursor: pointer; }

.fc .is-off-day { background: var(--off-day); }
.fc .special-day { opacity: 1; }
.fc .special-day .fc-event-title { color: var(--text); font-style: normal; font-size: 12px; font-weight: 500; }
.fc .is-high .fc-event-title { font-weight: 600; }
.fc .is-high .fc-event-title::before { content: "! "; }

.fc .is-done { opacity: 0.55; }
.fc .is-done .fc-event-title,
.fc .is-done .fc-list-event-title { text-decoration: line-through; }

/* ---------- hover preview ---------- */

.task-tip {
  position: fixed;
  z-index: 1000;
  max-width: min(360px, calc(100vw - 16px));
  padding: 10px 12px;
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.18);
  font-size: 13px;
  line-height: 1.5;
  pointer-events: none;
  overflow-wrap: anywhere;
}
.task-tip[hidden] { display: none; }
.tip-title { display: flex; align-items: baseline; gap: 8px; font-weight: 600; font-size: 14px; margin-bottom: 4px; }
.tip-title .dot { flex: none; }
.tip-meta { color: var(--muted); }
.tip-overdue { color: var(--overdue); font-weight: 500; }
.tip-description {
  margin-top: 8px;
  padding-top: 8px;
  border-top: 1px solid var(--border);
  white-space: pre-wrap;
}
.tip-section { margin-top: 8px; font-weight: 500; }
.tip-checklist { list-style: none; margin: 2px 0 0; padding: 0; }
.tip-checklist .is-checked { color: var(--muted); text-decoration: line-through; }
.tip-more { color: var(--muted); }

/* ---------- print ---------- */

@media print {
  @page { size: A4 landscape; margin: 10mm; }
  body { height: auto; display: block; background: #fff; font-size: 12px; }
  * { -webkit-print-color-adjust: exact; print-color-adjust: exact; }
  .topbar, .banner, .gantt-toolbar, .column-head .btn, .fc-header-toolbar .fc-button-group,
  .fc-header-toolbar .fc-today-button, dialog, .task-tip { display: none !important; }
  .print-header { display: block; margin: 0 0 8px; font-size: 12px; color: #5f6b7f; }
  main { padding: 0; overflow: visible; }
  .view, .panel, #calendar, .board { height: auto !important; }
  .panel, #calendar { border: 0; padding: 0; }
  .column-body { overflow: visible; }
  /* Paper can be narrower than the small-screen breakpoint; keep the desktop layout. */
  .board { grid-template-columns: repeat(3, minmax(0, 1fr)) !important; }
  .summary-grid { grid-template-columns: repeat(3, minmax(0, 1fr)) !important; }
  .card, .summary-card, .fc-event { break-inside: avoid; }
  #gantt .gantt-container { max-height: none !important; overflow: visible; }
}

/* ---------- small screens ---------- */

@media (max-width: 760px) {
  .tabs { order: 3; width: 100%; }
  .search { width: 130px; }
  .tabs button { flex: 1; }
  .topbar-actions { margin-left: 0; }

  .board { grid-template-columns: 1fr; height: auto; }
  #view-board { height: auto; }
  .column-body { overflow: visible; }
}

@media (max-width: 640px) {
  main { padding: 8px; }
  .panel, #calendar { padding: 8px; }
  .fc .fc-header-toolbar { justify-content: center; }
  .fc .fc-toolbar-title { font-size: 17px; }
  .hint { display: none; }
}