:root {
  --bg: #0f111a;
  --fg: #e6e6e6;
  --muted: #9aa0ac;
  --surface: rgba(255, 255, 255, 0.06);
  --surface-soft: rgba(255, 255, 255, 0.03);
  --glass-border: rgba(255, 255, 255, 0.08);
  --primary: #6366f1;
  --primary-contrast: #fff;
  --danger: #ef4444;
  --radius: 16px;
  --shadow: 0 8px 30px rgba(0, 0, 0, 0.15);
}

:root.light {
  --bg: #f6f7fb;
  --fg: #111;
  --muted: #666;
  --surface: rgba(255, 255, 255, 0.7);
  --surface-soft: rgba(255, 255, 255, 0.5);
  --glass-border: rgba(0, 0, 0, 0.05);
  --shadow: 0 8px 30px rgba(0, 0, 0, 0.05);
}

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

html, body {
  height: 100%;
}

body {
  margin: 0;
  font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, Segoe UI, Roboto, Ubuntu, Cantarell, Noto Sans, sans-serif;
  background: var(--bg);
  color: var(--fg);
  line-height: 1.5;
  overflow-y: scroll;
}

.bg {
  position: fixed;
  inset: 0;
  background:
    radial-gradient(circle at 20% 20%, rgba(99, 102, 241, 0.15), transparent 50%),
    radial-gradient(circle at 80% 0%, rgba(236, 72, 153, 0.08), transparent 60%),
    radial-gradient(circle at 40% 80%, rgba(34, 197, 94, 0.08), transparent 70%);
  z-index: -2;
}

.glass {
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  background: var(--surface);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.glass.soft {
  background: var(--surface-soft);
}

.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 24px;
  margin: 24px;
}

.app-header h1 {
  margin: 0;
  font-size: 1.6rem;
  font-weight: 700;
}

.header-actions {
  display: flex;
  gap: 8px;
}

.board-progress {
  margin: 0 24px 16px;
  padding: 14px 18px;
}

.board {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(280px, 360px);
  gap: 16px;
  padding: 0 24px 24px;
  overflow-x: auto;
}

.column {
  display: flex;
  flex-direction: column;
  max-height: calc(100vh - 210px);
}

.column-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 14px 16px 10px;
  border-bottom: 1px solid var(--glass-border);
}

.column-title {
  margin: 0;
  outline: none;
}

.col-actions {
  display: flex;
  gap: 6px;
}

.column-progress {
  padding: 10px 16px 0;
}

.tasks {
  flex: 1;
  overflow-y: auto;
  padding: 12px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.task {
  cursor: grab;
  user-select: none;
  padding: 12px 12px 10px;
  border-radius: calc(var(--radius) - 6px);
  transition: transform 0.1s;
}

.task:active {
  cursor: grabbing;
  transform: scale(0.99);
}

.task.dragging {
  opacity: 0.6;
}

.task-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 4px;
}

.task-title {
  margin: 0 0 6px;
  font-size: 0.95rem;
  font-weight: 600;
}

.task-desc {
  margin: 0 0 8px;
  font-size: 0.85rem;
  color: var(--muted);
}

.task-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 6px;
  font-size: 0.75rem;
}

.badge {
  display: inline-block;
  padding: 2px 6px;
  border-radius: 9999px;
  background: rgba(255,255,255,0.08);
}

.tags {
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
}

.tag {
  font-size: 0.7rem;
  padding: 2px 6px;
  border-radius: 9999px;
  background: rgba(255,255,255,0.08);
}

.progress-label {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.8rem;
  margin-bottom: 4px;
}

.progress-bar {
  height: 6px;
  background: rgba(255,255,255,0.06);
  border-radius: 9999px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: var(--primary);
  transition: width 0.2s;
}

.btn {
  border: none;
  border-radius: 10px;
  padding: 6px 12px;
  font-weight: 500;
  cursor: pointer;
  transition: transform 0.08s, opacity 0.2s;
}

.btn:hover {
  transform: translateY(-1px);
  opacity: 0.95;
}

.btn:active {
  transform: translateY(0);
}

.btn.primary {
  background: var(--primary);
  color: var(--primary-contrast);
}

.btn.outline {
  background: transparent;
  border: 1px solid var(--glass-border);
  color: inherit;
}

.btn.danger {
  background: var(--danger);
  color: #fff;
}

.btn.danger.outline {
  background: transparent;
  color: var(--danger);
  border: 1px solid var(--danger);
}

.btn.xs {
  padding: 2px 6px;
  font-size: 0.75rem;
  border-radius: 6px;
}

dialog {
  max-width: 520px;
  width: 100%;
  border: none;
  padding: 0;
}

dialog::backdrop {
  backdrop-filter: blur(2px);
  background: rgba(0,0,0,0.3);
}

#taskForm {
  display: grid;
  gap: 10px;
  padding: 20px 20px 16px;
}

#taskForm h2 {
  margin: 0 0 6px 0;
}

#taskForm label {
  display: grid;
  gap: 6px;
  font-size: 0.85rem;
}

#taskForm input[type="text"],
#taskForm input[type="date"],
#taskForm textarea {
  background: transparent;
  border: 1px solid var(--glass-border);
  border-radius: 8px;
  padding: 8px 10px;
  color: inherit;
  font-family: inherit;
  resize: vertical;
}

.modal-actions {
  margin-top: 6px;
  display: flex;
  justify-content: flex-end;
  gap: 8px;
}

.placeholder {
  outline: 2px dashed rgba(255,255,255,0.15);
  outline-offset: -6px;
  border-radius: calc(var(--radius) - 6px);
  min-height: 54px;
}

.column.dragging {
  opacity: 0.7;
}

.column-placeholder {
  width: 320px;
  border: 2px dashed rgba(255,255,255,0.15);
  border-radius: var(--radius);
  margin: 0 0 24px 0;
  min-height: 120px;
}

::-webkit-scrollbar {
  height: 8px;
  width: 8px;
}
::-webkit-scrollbar-thumb {
  background: rgba(255,255,255,0.08);
  border-radius: 9999px;
}