:root {
  color-scheme: light;
  font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --page-bg: radial-gradient(circle at top left, rgba(59, 130, 246, 0.14), transparent 24%), linear-gradient(180deg, #f8fafc 0%, #e2e8f0 100%);
  --surface-bg: rgba(255, 255, 255, 0.96);
  --panel-bg: #ffffff;
  --input-bg: #f8fafc;
  --border: #cbd5e1;
  --text: #0f172a;
  --muted-text: #475569;
  --accent: #2563eb;
  --shadow: 0 22px 48px rgba(15, 23, 42, 0.08);
  --secondary-surface: #e2e8f0;
  --danger-bg: #ef4444;
  --success-bg: #16a34a;
  --card-shadow: 0 18px 32px rgba(15, 23, 42, 0.07);
}

* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  min-height: 100%;
}

body {
  background: var(--page-bg);
  color: var(--text);
}

button, input, select, textarea {
  font: inherit;
}

.app-shell {
  max-width: 1200px;
  margin: 0 auto;
  padding: 24px;
}

.app-header {
  margin-bottom: 24px;
  padding: 28px 28px 32px;
  border-radius: 28px;
  background: var(--surface-bg);
  box-shadow: var(--shadow);
}

.header-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 16px;
  flex-wrap: wrap;
}

.app-header h1 {
  margin: 0 0 10px;
  font-size: clamp(2rem, 3vw, 3rem);
}

.app-header p {
  margin: 0;
  color: var(--muted-text);
  line-height: 1.6;
}

.content-grid {
  display: grid;
  gap: 24px;
  grid-template-columns: minmax(320px, 400px) minmax(0, 1fr);
}

.task-panel,
.task-board {
  display: grid;
  gap: 24px;
}

.panel-card,
.board-card {
  background: var(--panel-bg);
  border-radius: 24px;
  padding: 24px;
  box-shadow: var(--card-shadow);
}

.task-form label {
  display: grid;
  gap: 8px;
  margin-bottom: 16px;
  color: var(--muted-text);
}

.task-form input,
.task-form select,
.task-form textarea {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 14px 16px;
  background: var(--input-bg);
  transition: border-color 0.2s ease, background-color 0.2s ease;
}

.task-form input:focus,
.task-form select:focus,
.task-form textarea:focus {
  outline: none;
  border-color: #3b82f6;
  background: var(--panel-bg);
}

.form-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 8px;
}

.primary-button,
.secondary-button {
  border: none;
  border-radius: 14px;
  padding: 12px 18px;
  cursor: pointer;
  transition: transform 0.2s ease, background-color 0.2s ease;
}

.primary-button {
  background: var(--accent);
  color: white;
}

.secondary-button {
  background: var(--secondary-surface);
  color: var(--text);
}

.primary-button:hover,
.secondary-button:hover {
  transform: translateY(-1px);
}

.summary-card h2,
.board-header h2 {
  margin-top: 0;
}

.summary-grid {
  display: grid;
  gap: 14px;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.summary-item {
  background: var(--input-bg);
  padding: 18px 16px;
  border-radius: 18px;
  text-align: center;
}

.summary-item span {
  display: block;
  font-size: 2rem;
  font-weight: 700;
  color: var(--accent);
}

.summary-item small {
  color: #64748b;
}

.task-list {
  display: grid;
  gap: 14px;
  min-height: 180px;
}

.task-item {
  position: relative;
  display: grid;
  gap: 14px;
  padding: 20px;
  border-radius: 22px;
  background: var(--input-bg);
  border: 1px solid var(--border);
  cursor: grab;
}

.task-item:active {
  cursor: grabbing;
}

.task-item.dragging {
  opacity: 0.5;
  transform: scale(0.98);
}

.task-item:hover {
  box-shadow: var(--shadow);
}

.task-item-header {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: flex-start;
}

.task-title {
  margin: 0;
  font-size: 1rem;
  font-weight: 700;
}

.task-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 8px;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 10px;
  border-radius: 999px;
  font-size: 0.8rem;
  font-weight: 600;
}

.badge.category {
  background: #dbeafe;
  color: #1d4ed8;
}

.badge.priority-high {
  background: #fee2e2;
  color: #b91c1c;
}

.badge.priority-medium {
  background: #fef9c3;
  color: #b45309;
}

.badge.priority-low {
  background: #d1fae5;
  color: #0f766e;
}

.badge.status {
  background: var(--secondary-surface);
  color: var(--text);
}

.overdue {
  color: #991b1b;
}

.task-date {
  color: var(--muted-text);
  font-size: 0.95rem;
}

.task-desc {
  margin: 0;
  color: var(--muted-text);
  line-height: 1.7;
  min-height: 1.35em;
}

.task-controls {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.task-controls button {
  border: none;
  border-radius: 14px;
  padding: 10px 14px;
  background: var(--secondary-surface);
  color: var(--text);
  cursor: pointer;
}

.complete-button {
  background: #16a34a;
  color: white;
}

.delete-button {
  background: #ef4444;
  color: white;
}

.completed-list {
  background: var(--input-bg);
  border: 1px dashed var(--border);
  padding: 18px;
  min-height: 220px;
}

.theme-toggle-button {
  min-width: 140px;
}

body.dark {
  color-scheme: dark;
  --page-bg: radial-gradient(circle at top left, rgba(96, 165, 250, 0.16), transparent 24%), linear-gradient(180deg, #0f172a 0%, #111827 100%);
  --surface-bg: rgba(15, 23, 42, 0.85);
  --panel-bg: #111827;
  --input-bg: #1f2937;
  --border: #374151;
  --text: #e2e8f0;
  --muted-text: #cbd5e1;
  --accent: #60a5fa;
  --shadow: 0 22px 48px rgba(15, 23, 42, 0.35);
  --secondary-surface: #374151;
  --danger-bg: #fca5a5;
  --success-bg: #34d399;
  --card-shadow: 0 18px 32px rgba(15, 23, 42, 0.35);
}

@media (max-width: 960px) {
  .content-grid {
    grid-template-columns: 1fr;
  }
}