* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  -webkit-tap-highlight-color: transparent;
}

:root {
  --bg-primary: #0a0a0b;
  --bg-secondary: #121214;
  --bg-tertiary: #1a1a1d;
  --bg-hover: #232326;
  --bg-active: #2a2a2e;
  
  --border: #27272a;
  --border-hover: #3f3f46;
  
  --text-primary: #fafafa;
  --text-secondary: #a1a1aa;
  --text-tertiary: #71717a;
  
  --accent: #6366f1;
  --accent-hover: #818cf8;
  --accent-muted: rgba(99, 102, 241, 0.15);
  
  --danger: #ef4444;
  --danger-hover: #f87171;
  
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.4);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.5);
  --shadow-lg: 0 12px 40px rgba(0,0,0,0.6);
  
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  
  --header-height: 56px;
  
  --safe-top: env(safe-area-inset-top, 0px);
  --safe-bottom: env(safe-area-inset-bottom, 0px);
  --safe-left: env(safe-area-inset-left, 0px);
  --safe-right: env(safe-area-inset-right, 0px);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Inter', Roboto, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  font-size: 14px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

/* Header */
header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  padding-top: var(--safe-top);
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-left: max(16px, var(--safe-left));
  padding-right: max(16px, var(--safe-right));
  background: var(--bg-primary);
  border-bottom: 1px solid var(--border);
  z-index: 100;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 10px;
}

.logo {
  font-size: 24px;
}

header h1 {
  font-size: 15px;
  font-weight: 600;
  letter-spacing: -0.01em;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 8px 14px;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.15s ease;
  white-space: nowrap;
}

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

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

.btn-primary:active {
  transform: scale(0.98);
}

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
}

.btn-ghost:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

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

.btn-danger:hover {
  background: rgba(239, 68, 68, 0.1);
  color: var(--danger-hover);
}

.btn-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border: none;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.15s ease;
}

.btn-icon:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.btn-icon:active {
  background: var(--bg-active);
}

/* Board */
.board {
  display: flex;
  gap: 12px;
  padding: calc(var(--header-height) + var(--safe-top) + 16px) 16px 16px;
  padding-bottom: calc(16px + var(--safe-bottom));
  padding-left: max(16px, var(--safe-left));
  padding-right: max(16px, var(--safe-right));
  height: 100vh;
  overflow-x: auto;
  overflow-y: hidden;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
}

/* Column */
.column {
  flex-shrink: 0;
  width: 320px;
  max-height: 100%;
  display: flex;
  flex-direction: column;
  scroll-snap-align: start;
}

.column-header {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 4px;
  margin-bottom: 8px;
}

.column-title {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  outline: none;
  border-radius: var(--radius-sm);
  padding: 4px 8px;
  margin: -4px -8px;
  transition: all 0.15s ease;
}

.column-title:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.column-title:focus {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.column-count {
  font-size: 12px;
  color: var(--text-tertiary);
  font-weight: 500;
}

.column-actions {
  margin-left: auto;
  opacity: 0;
  transition: opacity 0.15s ease;
}

.column:hover .column-actions {
  opacity: 1;
}

.column-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border: none;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--text-tertiary);
  cursor: pointer;
  font-size: 14px;
  transition: all 0.15s ease;
}

.column-btn:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

/* Cards container */
.cards {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 2px;
  margin: -2px;
}

/* Card */
.card {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 12px;
  cursor: pointer;
  transition: all 0.15s ease;
  position: relative;
}

.card::before {
  content: '';
  position: absolute;
  left: 0;
  top: 12px;
  bottom: 12px;
  width: 3px;
  border-radius: 0 2px 2px 0;
  background: var(--card-color, var(--accent));
  opacity: 0.8;
}

.card:hover {
  background: var(--bg-tertiary);
  border-color: var(--border-hover);
}

.card:active {
  transform: scale(0.99);
}

.card.dragging {
  opacity: 0.5;
  transform: rotate(2deg) scale(1.02);
  box-shadow: var(--shadow-lg);
}

.card-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 8px;
  padding-left: 8px;
  margin-bottom: 4px;
}

.card-title {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-primary);
  flex: 1;
}

.card-id {
  font-size: 10px;
  font-weight: 600;
  color: var(--text-tertiary);
  font-family: 'SF Mono', 'Consolas', monospace;
  flex-shrink: 0;
}

.card-description {
  font-size: 13px;
  color: var(--text-tertiary);
  padding-left: 8px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.card-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  padding-left: 8px;
  margin-top: 8px;
}

.card-comment-count {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 11px;
  color: var(--text-tertiary);
}

.card-comment-count svg {
  width: 12px;
  height: 12px;
}

.card-priority {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 10px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  padding: 2px 6px;
  border-radius: 4px;
  background: var(--priority-bg);
  color: var(--priority-color);
}

.card-priority.urgent {
  --priority-bg: rgba(239, 68, 68, 0.15);
  --priority-color: #ef4444;
}

.card-priority.high {
  --priority-bg: rgba(249, 115, 22, 0.15);
  --priority-color: #f97316;
}

.card-priority.medium {
  --priority-bg: rgba(234, 179, 8, 0.15);
  --priority-color: #eab308;
}

.card-priority.low {
  --priority-bg: rgba(34, 197, 94, 0.15);
  --priority-color: #22c55e;
}

/* Add card button */
.add-card-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  width: 100%;
  padding: 10px;
  margin-top: 6px;
  background: transparent;
  border: 1px dashed var(--border);
  border-radius: var(--radius-md);
  color: var(--text-tertiary);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.15s ease;
}

.add-card-btn:hover {
  background: var(--accent-muted);
  border-color: var(--accent);
  color: var(--accent);
}

.add-card-btn:active {
  transform: scale(0.98);
}

/* Drop zone */
.column.drag-over .cards {
  background: var(--accent-muted);
  border-radius: var(--radius-md);
}

.drop-placeholder {
  height: 48px;
  background: var(--accent-muted);
  border: 2px dashed var(--accent);
  border-radius: var(--radius-md);
  margin: 3px 0;
}

/* Modal */
.modal {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: flex;
  justify-content: center;
  align-items: flex-end;
  padding: var(--safe-top) var(--safe-right) var(--safe-bottom) var(--safe-left);
}

.modal.hidden {
  display: none;
}

.modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}

.modal-content {
  position: relative;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
  width: 100%;
  max-width: 520px;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: var(--shadow-lg);
  animation: slideUp 0.2s ease;
}

.modal-sm {
  max-width: 400px;
}

.modal-lg {
  max-width: 560px;
}

.modal-title-row {
  display: flex;
  align-items: center;
  gap: 10px;
}

.task-id-badge {
  font-size: 11px;
  font-weight: 600;
  color: var(--accent);
  background: var(--accent-muted);
  padding: 3px 8px;
  border-radius: 4px;
  font-family: 'SF Mono', 'Consolas', monospace;
}

@keyframes slideUp {
  from {
    transform: translateY(100%);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
}

.modal-header h2 {
  font-size: 15px;
  font-weight: 600;
}

#card-form,
#column-form {
  padding: 20px;
}

.form-group {
  margin-bottom: 16px;
}

.form-group:last-of-type {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  font-size: 12px;
  font-weight: 600;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 8px;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 12px;
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 14px;
  font-family: inherit;
  transition: all 0.15s ease;
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--text-tertiary);
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-muted);
}

.form-group textarea {
  resize: vertical;
  min-height: 100px;
}

/* Priority picker */
.priority-picker {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.priority-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--bg-primary);
  color: var(--text-secondary);
  font-size: 13px;
  cursor: pointer;
  transition: all 0.15s ease;
}

.priority-btn:hover {
  border-color: var(--border-hover);
  color: var(--text-primary);
}

.priority-btn.selected {
  border-color: var(--accent);
  background: var(--accent-muted);
  color: var(--text-primary);
}

.priority-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  flex-shrink: 0;
}

/* Comments section */
.comments-section {
  margin-bottom: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
}

.comments-section label {
  display: block;
  font-size: 12px;
  font-weight: 600;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 12px;
}

.comments-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 12px;
  max-height: 200px;
  overflow-y: auto;
}

.comment {
  background: var(--bg-primary);
  border-radius: var(--radius-md);
  padding: 10px 12px;
}

.comment-header {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 4px;
}

.comment-author {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-primary);
}

.comment-author.mweme {
  color: var(--accent);
}

.comment-time {
  font-size: 11px;
  color: var(--text-tertiary);
}

.comment-content {
  font-size: 13px;
  color: var(--text-secondary);
  white-space: pre-wrap;
  word-break: break-word;
}

.no-comments {
  font-size: 13px;
  color: var(--text-tertiary);
  text-align: center;
  padding: 12px;
}

.modal-actions {
  display: flex;
  gap: 8px;
  padding-top: 8px;
  border-top: 1px solid var(--border);
}

.modal-actions .spacer {
  flex: 1;
}

/* Scrollbar */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

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

::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 4px;
}

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

.hidden {
  display: none !important;
}

/* Mobile */
@media (max-width: 640px) {
  .board {
    gap: 0;
    padding-left: 0;
    padding-right: 0;
  }
  
  .column {
    width: 100vw;
    padding: 0 16px;
    scroll-snap-align: center;
  }
  
  .column-actions {
    opacity: 1;
  }
  
  .modal-content {
    max-width: 100%;
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
  }
  
  .card {
    padding: 14px;
  }
  
  .card-title {
    font-size: 15px;
  }
  
  .add-card-btn {
    padding: 14px;
  }
}

/* Desktop modal positioning */
@media (min-width: 641px) {
  .modal {
    align-items: center;
    padding: 20px;
  }
  
  .modal-content {
    border-radius: var(--radius-lg);
  }
  
  @keyframes slideUp {
    from {
      transform: translateY(20px);
      opacity: 0;
    }
    to {
      transform: translateY(0);
      opacity: 1;
    }
  }
}

/* Touch feedback for mobile */
@media (hover: none) {
  .card:active {
    background: var(--bg-tertiary);
  }
  
  .btn:active {
    opacity: 0.8;
  }
}

/* Prevent text selection during drag */
.dragging-active {
  user-select: none;
  -webkit-user-select: none;
}

/* PWA standalone mode */
@media (display-mode: standalone) {
  header {
    padding-top: calc(var(--safe-top) + 8px);
  }
}