/* CSS 變數 — 所有顏色、字體都從這裡控制 */
:root {
  --bg: #0f172a;
  --surface: #1e293b;
  --surface-hover: #263348;
  --accent: #3b82f6;
  --accent-hover: #2563eb;
  --text: #f1f5f9;
  --text-muted: #94a3b8;
  --success: #22c55e;
  --danger: #ef4444;
  --warning: #f59e0b;
  --border: rgba(255,255,255,0.08);
  --shadow: 0 4px 24px rgba(0,0,0,0.3);
  --radius: 14px;
  --radius-sm: 8px;
  --font: system-ui, -apple-system, sans-serif;
  --font-size: 15px;
  --transition: 0.2s ease;
}

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

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: var(--font-size);
  min-height: 100vh;
  line-height: 1.6;
}

/* ── Header ── */
.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 24px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
  gap: 12px;
}
.header-left { display: flex; align-items: center; gap: 10px; }
.header-logo-link { text-decoration: none; }
.header-logo { font-size: 1.2em; font-weight: 800; color: var(--accent); transition: opacity 0.15s; }
.header-logo-link:hover .header-logo { opacity: 0.75; }
.header-title { font-weight: 600; color: var(--text-muted); font-size: 0.95em; }
.header-center { flex: 1; text-align: center; }
.header-date { font-size: 0.95em; color: var(--text-muted); }
.header-right { display: flex; align-items: center; gap: 8px; }

.btn-icon {
  background: rgba(255,255,255,0.06);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 7px 14px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 0.88em;
  transition: var(--transition);
  font-family: var(--font);
}
.btn-icon:hover { background: var(--accent); border-color: var(--accent); }

/* ── Sync Status ── */
.sync-status {
  text-align: center;
  padding: 8px;
  font-size: 0.85em;
  background: var(--accent);
  color: white;
  transition: var(--transition);
}
.sync-status.success { background: var(--success); }
.sync-status.error { background: var(--danger); }
.hidden { display: none !important; }

/* ── Main Grid ── */
.main {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  grid-template-rows: auto auto;
  gap: 20px;
  padding: 24px;
  max-width: 1600px;
  margin: 0 auto;
}

/* ── Panel ── */
.panel {
  background: var(--surface);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}
.panel-wide {
  grid-column: 1 / -1;
}

.panel-header {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
}
.panel-icon { font-size: 1.1em; }
.panel-title { font-size: 1em; font-weight: 700; flex: 1; }
.panel-badge {
  background: var(--accent);
  color: white;
  font-size: 0.75em;
  font-weight: 700;
  padding: 2px 9px;
  border-radius: 99px;
  min-width: 24px;
  text-align: center;
}

.panel-body {
  padding: 16px 20px;
  overflow-y: auto;
  max-height: 420px;
  flex: 1;
}

.empty-state {
  color: var(--text-muted);
  text-align: center;
  padding: 32px 0;
  font-size: 0.9em;
}

/* ── Email List ── */
.email-item {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  padding: 12px 0;
  border-bottom: 1px solid var(--border);
  cursor: default;
}
.email-item:last-child { border-bottom: none; }
.email-unread .email-subject { font-weight: 700; }
.email-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
  margin-top: 6px;
  flex-shrink: 0;
}
.email-unread .email-dot { background: var(--accent); }
.email-read .email-dot { background: transparent; border: 1px solid var(--border); }
.email-content { flex: 1; min-width: 0; }
.email-sender { font-size: 0.82em; color: var(--text-muted); margin-bottom: 2px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.email-subject { font-size: 0.92em; color: var(--text); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.email-meta { display: flex; gap: 6px; margin-top: 4px; }
.email-tag {
  font-size: 0.72em;
  padding: 1px 7px;
  border-radius: 99px;
  font-weight: 600;
}
.tag-unread { background: rgba(59,130,246,0.2); color: var(--accent); }
.tag-attach { background: rgba(245,158,11,0.2); color: var(--warning); }
.tag-flagged { background: rgba(239,68,68,0.2); color: var(--danger); }
.email-time { font-size: 0.78em; color: var(--text-muted); margin-left: auto; white-space: nowrap; }

/* ── Calendar Events ── */
.event-item {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  padding: 12px 0;
  border-bottom: 1px solid var(--border);
}
.event-item:last-child { border-bottom: none; }
.event-date-col { text-align: center; min-width: 48px; }
.event-day { font-size: 1.5em; font-weight: 800; color: var(--accent); line-height: 1; }
.event-weekday { font-size: 0.75em; color: var(--text-muted); }
.event-content { flex: 1; }
.event-title { font-size: 0.93em; font-weight: 600; margin-bottom: 3px; }
.event-time { font-size: 0.8em; color: var(--text-muted); }
.event-allday {
  display: inline-block;
  font-size: 0.72em;
  padding: 1px 7px;
  border-radius: 99px;
  background: rgba(34,197,94,0.2);
  color: var(--success);
  font-weight: 600;
}
.event-today .event-day { color: var(--warning); }

/* ── Todos ── */
.date-nav {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-left: auto;
}
.btn-nav {
  background: none;
  border: 1px solid var(--border);
  color: var(--text);
  width: 28px;
  height: 28px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 1.1em;
  transition: var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
}
.btn-nav:hover { background: var(--accent); border-color: var(--accent); }
.todo-date { font-size: 0.85em; color: var(--text-muted); min-width: 100px; text-align: center; }

.todo-input-row {
  display: flex;
  gap: 10px;
  padding: 14px 20px;
  border-bottom: 1px solid var(--border);
}
.todo-input {
  flex: 1;
  background: rgba(255,255,255,0.06);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 9px 14px;
  border-radius: var(--radius-sm);
  font-size: 0.93em;
  font-family: var(--font);
  outline: none;
  transition: var(--transition);
}
.todo-input:focus { border-color: var(--accent); background: rgba(59,130,246,0.08); }
.todo-input::placeholder { color: var(--text-muted); }

.btn-add {
  background: var(--accent);
  color: white;
  border: none;
  padding: 9px 20px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 0.9em;
  font-weight: 600;
  font-family: var(--font);
  transition: var(--transition);
  white-space: nowrap;
}
.btn-add:hover { background: var(--accent-hover); }

.todo-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 4px;
  border-bottom: 1px solid var(--border);
  transition: var(--transition);
  cursor: default;
}
.todo-item:last-child { border-bottom: none; }
.todo-item:hover { background: var(--surface-hover); margin: 0 -4px; padding: 12px 8px; border-radius: var(--radius-sm); }

.todo-checkbox {
  width: 20px;
  height: 20px;
  border-radius: 6px;
  border: 2px solid var(--border);
  cursor: pointer;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
  background: transparent;
}
.todo-checkbox:hover { border-color: var(--accent); }
.todo-item.done .todo-checkbox {
  background: var(--success);
  border-color: var(--success);
}
.todo-item.done .todo-checkbox::after { content: '✓'; color: white; font-size: 12px; font-weight: 700; }
.todo-item.done .todo-text { text-decoration: line-through; color: var(--text-muted); }

.todo-text { flex: 1; font-size: 0.93em; }
.todo-text-edit {
  flex: 1;
  background: rgba(255,255,255,0.06);
  border: 1px solid var(--accent);
  color: var(--text);
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  font-size: 0.93em;
  font-family: var(--font);
  outline: none;
}

.todo-delete {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 0.9em;
  padding: 4px 6px;
  border-radius: var(--radius-sm);
  opacity: 0;
  transition: var(--transition);
}
.todo-item:hover .todo-delete { opacity: 1; }
.todo-delete:hover { color: var(--danger); background: rgba(239,68,68,0.1); }

.todo-footer {
  padding: 10px 20px;
  font-size: 0.82em;
  color: var(--text-muted);
  border-top: 1px solid var(--border);
}

/* ── Pool Panel ── */
.pool-body { min-height: 80px; }
.panel-hint {
  font-size: 0.78em;
  color: var(--text-muted);
  margin-left: 4px;
}

/* ── Drag & Drop ── */
.todo-item[draggable="true"] { cursor: grab; }
.todo-item[draggable="true"]:active { cursor: grabbing; }

.todo-item.dragging {
  opacity: 0.4;
  border: 2px dashed var(--accent);
  border-radius: var(--radius-sm);
}

.drag-handle {
  color: var(--text-muted);
  font-size: 0.85em;
  padding: 0 4px;
  cursor: grab;
  opacity: 0;
  transition: var(--transition);
  flex-shrink: 0;
}
.todo-item:hover .drag-handle { opacity: 1; }

.drag-over {
  background: rgba(59,130,246,0.08) !important;
  border: 2px dashed var(--accent) !important;
  border-radius: var(--radius-sm);
}

.drop-hint { line-height: 1.8; }
.drop-hint-sub { font-size: 0.82em; color: var(--text-muted); }

.pool-item-date {
  font-size: 0.75em;
  padding: 2px 8px;
  border-radius: 99px;
  background: rgba(139,92,246,0.18);
  color: #a78bfa;
  white-space: nowrap;
  flex-shrink: 0;
}

/* ── Settings Panel ── */
.settings-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  z-index: 200;
}
.settings-panel {
  position: fixed;
  top: 0;
  right: 0;
  width: 320px;
  height: 100vh;
  background: var(--surface);
  border-left: 1px solid var(--border);
  z-index: 201;
  display: flex;
  flex-direction: column;
  box-shadow: -8px 0 40px rgba(0,0,0,0.4);
  overflow-y: auto;
}
.settings-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px;
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  background: var(--surface);
}
.settings-header h2 { font-size: 1em; font-weight: 700; }
.btn-close {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 1.1em;
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  transition: var(--transition);
}
.btn-close:hover { color: var(--danger); background: rgba(239,68,68,0.1); }

.settings-body { padding: 20px 24px; flex: 1; }
.settings-section { margin-bottom: 28px; }
.settings-section h3 { font-size: 0.85em; font-weight: 700; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.06em; margin-bottom: 14px; }

.setting-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 0;
  border-bottom: 1px solid var(--border);
}
.setting-row:last-child { border-bottom: none; }
.setting-row label { font-size: 0.9em; color: var(--text); }

.setting-row input[type="color"] {
  width: 40px;
  height: 32px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  padding: 2px;
  background: var(--surface);
}

.setting-row select {
  background: rgba(255,255,255,0.06);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 6px 10px;
  border-radius: var(--radius-sm);
  font-size: 0.85em;
  font-family: var(--font);
  cursor: pointer;
  max-width: 160px;
}

.slider-row {
  display: flex;
  align-items: center;
  gap: 10px;
}
.slider-row input[type="range"] {
  width: 100px;
  accent-color: var(--accent);
}
.slider-row span { font-size: 0.82em; color: var(--text-muted); min-width: 36px; }

/* Toggle switch */
.toggle { position: relative; display: inline-block; width: 44px; height: 24px; }
.toggle input { opacity: 0; width: 0; height: 0; }
.toggle-slider {
  position: absolute;
  inset: 0;
  background: rgba(255,255,255,0.1);
  border-radius: 99px;
  cursor: pointer;
  transition: var(--transition);
}
.toggle-slider::before {
  content: '';
  position: absolute;
  width: 18px;
  height: 18px;
  left: 3px;
  top: 3px;
  background: white;
  border-radius: 50%;
  transition: var(--transition);
}
.toggle input:checked + .toggle-slider { background: var(--accent); }
.toggle input:checked + .toggle-slider::before { transform: translateX(20px); }

/* Theme Presets */
.theme-presets { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.preset-btn {
  background: rgba(255,255,255,0.06);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 10px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 0.85em;
  font-family: var(--font);
  transition: var(--transition);
}
.preset-btn:hover { background: var(--accent); border-color: var(--accent); }

.btn-save-settings {
  width: 100%;
  background: var(--accent);
  color: white;
  border: none;
  padding: 12px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 0.93em;
  font-weight: 600;
  font-family: var(--font);
  transition: var(--transition);
  margin-top: 8px;
}
.btn-save-settings:hover { background: var(--accent-hover); }

/* ── Responsive ── */
@media (max-width: 1024px) {
  .main { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 768px) {
  .main { grid-template-columns: 1fr; padding: 16px; gap: 16px; }
  .panel-wide { grid-column: 1; }
  .settings-panel { width: 100%; }
  .header { padding: 12px 16px; }
}