/* ===== CSS Variables ===== */
:root {
  --bg: #1e1e1e;
  --surface: #282828;
  --border: #383838;
  --border-light: #333333;
  --text: #e0e0e0;
  --text-secondary: #999999;
  --text-muted: #666666;
  --accent: #5cadff;
  --accent-hover: #7cbfff;
  --accent-light: #1a3050;
  --meal-bg: #2a2a24;
  --danger: #f85149;
  --danger-hover: #ff6b63;
  --danger-bg: #2d1115;
  --radius-sm: 4px;
  --radius: 8px;
  --radius-lg: 12px;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.3);
  --shadow: 0 1px 3px rgba(0,0,0,0.4), 0 1px 2px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.5);
  --transition: 150ms ease;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans TC", "Microsoft JhengHei", sans-serif;
  --font-mono: "SF Mono", "Fira Code", "Cascadia Code", monospace;

  /* Layout */
  --config-bar-height: 52px;
  --topic-pool-width: 300px;
  --time-column-width: 56px;
  --venue-column-min-width: 200px;

  /* Timeline */
  --pixels-per-minute: 2.5;
}

/* ===== Reset ===== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html, body {
  height: 100%;
  overflow: hidden;
}

body {
  font-family: var(--font);
  font-size: 15px;
  color: var(--text);
  background: var(--bg);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

/* ===== App Layout ===== */
#app {
  display: flex;
  flex-direction: column;
  height: 100vh;
}

#main-content {
  display: flex;
  flex: 1;
  overflow: hidden;
}

/* ===== Config Bar ===== */
#config-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 0 16px;
  height: var(--config-bar-height);
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
  z-index: 10;
  overflow-x: auto;
  white-space: nowrap;
}

.config-group {
  display: flex;
  align-items: center;
  gap: 6px;
}

.config-label {
  font-size: 14px;
  color: var(--text-secondary);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.config-input {
  height: 30px;
  padding: 0 8px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-family: var(--font);
  color: var(--text);
  background: var(--surface);
  outline: none;
  transition: border-color var(--transition);
}

.config-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px var(--accent-light);
}

.config-input[type="time"] {
  width: 110px;
}

.config-input[type="number"] {
  width: 64px;
}

.config-input.small {
  width: 80px;
}

.config-divider {
  width: 1px;
  height: 24px;
  background: var(--border);
  margin: 0 4px;
}

.config-btn {
  height: 30px;
  padding: 0 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-family: var(--font);
  font-weight: 500;
  color: var(--text-secondary);
  background: var(--surface);
  cursor: pointer;
  white-space: nowrap;
  transition: all var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.config-btn:hover {
  background: var(--bg);
  border-color: var(--text-muted);
}

.config-btn.accent {
  background: var(--accent);
  color: white;
  border-color: var(--accent);
}

.config-btn.accent:hover {
  background: var(--accent-hover);
}

.config-btn.danger {
  color: var(--danger);
  border-color: var(--danger);
}

.config-btn.danger:hover {
  background: var(--danger-bg);
}

/* ===== Topic Pool ===== */
#topic-pool {
  width: var(--topic-pool-width);
  flex-shrink: 0;
  background: var(--surface);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.pool-header {
  padding: 14px 16px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.pool-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.pool-list {
  flex: 1;
  overflow-y: auto;
  padding: 8px;
}

.pool-empty {
  text-align: center;
  color: var(--text-muted);
  padding: 32px 16px;
  font-size: 14px;
}

/* Topic Card (in pool) */
.topic-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 10px 12px;
  margin-bottom: 6px;
  cursor: grab;
  user-select: none;
  transition: box-shadow var(--transition), border-color var(--transition);
  position: relative;
}

.topic-card:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow);
}

.topic-card:active {
  cursor: grabbing;
}

.topic-card.dragging {
  opacity: 0.4;
}

.topic-card .topic-name {
  font-size: 14px;
  font-weight: 500;
  color: var(--text);
  margin-bottom: 2px;
}

.topic-card .topic-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: var(--text-muted);
}

.topic-card .topic-duration {
  font-family: var(--font-mono);
}

.topic-card .topic-venue-tag {
  font-size: 12px;
  padding: 1px 6px;
  border-radius: 3px;
  background: var(--accent-light);
  color: var(--accent);
}

.topic-card .topic-speaker {
  font-size: 13px;
  color: var(--text-secondary);
}

.topic-card .topic-skip-break {
  font-size: 11px;
  color: var(--accent);
}

.topic-card .topic-desc {
  font-size: 13px;
  color: var(--text-muted);
  margin-top: 4px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.topic-card .topic-actions {
  position: absolute;
  top: 8px;
  right: 8px;
  display: flex;
  gap: 4px;
  opacity: 0;
  transition: opacity var(--transition);
}

.topic-card:hover .topic-actions {
  opacity: 1;
}

.topic-action-btn {
  width: 24px;
  height: 24px;
  border: none;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 15px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition);
}

.topic-action-btn:hover {
  background: var(--bg);
  color: var(--text);
}

.topic-action-btn.delete:hover {
  background: var(--danger-bg);
  color: var(--danger);
}

/* Color indicator strip */
.topic-card .topic-color-strip {
  position: absolute;
  left: 0;
  top: 4px;
  bottom: 4px;
  width: 3px;
  border-radius: 0 2px 2px 0;
}

.topic-card.has-color {
  padding-left: 16px;
}

/* Add topic form */
.pool-add-form {
  padding: 8px 16px 14px;
  border-top: 1px solid var(--border-light);
}

.pool-add-row {
  display: flex;
  gap: 6px;
  margin-bottom: 6px;
}

.pool-add-row:last-child {
  margin-bottom: 0;
}

.pool-add-input {
  flex: 1;
  height: 32px;
  padding: 0 8px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-family: var(--font);
  outline: none;
}

.pool-add-input:focus {
  border-color: var(--accent);
}

/* ===== Agenda Board ===== */
#agenda-board {
  flex: 1;
  overflow: auto;
  background: var(--bg);
  position: relative;
}

.board-inner {
  display: flex;
  min-height: 100%;
  position: relative;
}

/* Time Axis */
.time-axis {
  width: var(--time-column-width);
  flex-shrink: 0;
  position: relative;
  border-right: 1px solid var(--border);
  background: var(--surface);
  z-index: 2;
}

.time-axis-header {
  height: 40px;
  border-bottom: 1px solid var(--border);
  background: var(--surface);
  position: sticky;
  top: 0;
  z-index: 3;
}

.time-label {
  position: absolute;
  right: 8px;
  font-size: 12px;
  font-family: var(--font-mono);
  color: var(--text-muted);
  transform: translateY(-50%);
  white-space: nowrap;
}

.time-grid-line {
  position: absolute;
  left: 0;
  right: 0;
  border-top: 1px solid var(--border-light);
  pointer-events: none;
}

/* Venue Columns Container */
.venue-columns {
  display: flex;
  flex: 1;
  position: relative;
}

/* Single Venue Column */
.venue-column {
  flex: 1;
  min-width: var(--venue-column-min-width);
  border-right: 1px solid var(--border-light);
  position: relative;
  background: repeating-linear-gradient(
    to bottom,
    transparent,
    transparent calc(var(--pixels-per-minute) * 30px - 1px),
    var(--border-light) calc(var(--pixels-per-minute) * 30px - 1px),
    var(--border-light) calc(var(--pixels-per-minute) * 30px)
  );
}

.venue-column:last-child {
  border-right: none;
}

.venue-column-header {
  height: 40px;
  padding: 0 12px;
  display: flex;
  align-items: center;
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
  border-bottom: 1px solid var(--border);
  background: var(--surface);
  position: sticky;
  top: 0;
  z-index: 3;
}

.venue-column-header .venue-name-input {
  border: none;
  background: transparent;
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
  font-family: var(--font);
  outline: none;
  width: 100%;
  padding: 2px 4px;
  border-radius: var(--radius-sm);
}

.venue-column-header .venue-name-input:focus {
  background: var(--bg);
}

.venue-column-header .venue-delete-btn {
  width: 24px;
  height: 24px;
  border: none;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  margin-left: 4px;
  transition: all var(--transition);
}

.venue-column-header .venue-delete-btn:hover {
  background: var(--danger-bg);
  color: var(--danger);
}

.venue-column-body {
  position: relative;
}

/* Topic Card (in agenda) */
.agenda-topic-card {
  position: absolute;
  left: 4px;
  right: 4px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 6px 8px;
  cursor: grab;
  user-select: none;
  overflow: hidden;
  transition: box-shadow var(--transition);
  z-index: 1;
  min-height: 28px;
}

.agenda-topic-card:hover {
  box-shadow: var(--shadow-md);
  z-index: 5;
}

.agenda-topic-card.dragging {
  opacity: 0.4;
}

.agenda-topic-card .card-name {
  font-size: 14px;
  font-weight: 500;
  color: var(--text);
  line-height: 1.3;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.agenda-topic-card .card-time {
  font-size: 11px;
  font-family: var(--font-mono);
  color: var(--text-muted);
  margin-top: 2px;
}

.agenda-topic-card .card-speaker {
  font-size: 12px;
  color: var(--text-secondary);
  margin-top: 1px;
}

.agenda-topic-card .card-skip-break {
  font-size: 11px;
  color: var(--accent);
  margin-top: 1px;
}

.agenda-topic-card .card-desc {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 1px;
  line-height: 1.3;
  word-break: break-all;
}

.agenda-topic-card .card-color-strip {
  position: absolute;
  left: 0;
  top: 3px;
  bottom: 3px;
  width: 3px;
  border-radius: 0 2px 2px 0;
}

.agenda-topic-card .card-remove-btn {
  position: absolute;
  top: 4px;
  right: 4px;
  width: 20px;
  height: 20px;
  border: none;
  border-radius: var(--radius-sm);
  background: var(--surface);
  color: var(--text-muted);
  cursor: pointer;
  font-size: 15px;
  display: none;
  align-items: center;
  justify-content: center;
}

.agenda-topic-card:hover .card-remove-btn {
  display: flex;
}

.agenda-topic-card .card-remove-btn:hover {
  background: var(--danger-bg);
  color: var(--danger);
}

/* Meal Block (overlay on venue columns) */
.meal-block {
  position: absolute;
  left: 0;
  right: 0;
  background: var(--meal-bg);
  border-top: 1px dashed var(--border);
  border-bottom: 1px dashed var(--border);
  z-index: 0;
  pointer-events: none;
  display: flex;
  align-items: center;
  justify-content: center;
}

.meal-label {
  font-size: 12px;
  color: var(--text-muted);
  font-weight: 500;
  letter-spacing: 0.02em;
  background: var(--meal-bg);
  padding: 2px 8px;
  border-radius: 3px;
}

/* Venue column drop indicator */
.venue-column.drag-over {
  background-color: var(--accent-light);
}

.drop-indicator {
  position: absolute;
  left: 4px;
  right: 4px;
  height: 2px;
  background: var(--accent);
  border-radius: 1px;
  z-index: 10;
  pointer-events: none;
}

/* ===== Modal / Dialog ===== */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.3);
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
}

.modal-dialog {
  background: var(--surface);
  border-radius: var(--radius-lg);
  box-shadow: 0 20px 60px rgba(0,0,0,0.15);
  padding: 24px;
  min-width: 360px;
  max-width: 480px;
}

.modal-title {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 16px;
}

.modal-row {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-bottom: 12px;
}

.modal-label {
  font-size: 14px;
  color: var(--text-secondary);
  font-weight: 500;
}

.modal-input {
  height: 34px;
  padding: 0 10px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 15px;
  font-family: var(--font);
  outline: none;
}

.modal-input:focus {
  border-color: var(--accent);
}

.modal-actions {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
  margin-top: 20px;
}

.modal-btn {
  height: 34px;
  padding: 0 16px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-family: var(--font);
  font-weight: 500;
  cursor: pointer;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  transition: all var(--transition);
}

.modal-btn:hover {
  background: var(--bg);
}

.modal-btn.primary {
  background: var(--accent);
  color: white;
  border-color: var(--accent);
}

.modal-btn.primary:hover {
  background: var(--accent-hover);
}

/* ===== Scrollbar ===== */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
  #topic-pool {
    width: 240px;
  }
  :root {
    --venue-column-min-width: 160px;
  }
}