/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.625rem 1rem;
    border: none;
    border-radius: var(--radius);
    font-family: inherit;
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition);
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-sm {
    padding: 0.375rem 0.75rem;
    font-size: 0.8125rem;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: white;
    box-shadow: var(--shadow);
}

.btn-primary:hover:not(:disabled) {
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background: var(--surface);
    color: var(--foreground);
    border: 1px solid var(--border);
}

.btn-secondary:hover:not(:disabled) {
    background: var(--surface-hover);
    border-color: var(--muted);
}

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

.btn-ghost:hover:not(:disabled) {
    background: var(--surface-hover);
    color: var(--foreground);
}

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

.btn-danger:hover:not(:disabled) {
    background: var(--error);
    filter: brightness(1.1);
}

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

.btn-accent:hover:not(:disabled) {
    background: var(--accent);
    filter: brightness(1.1);
}

.btn-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    padding: 0;
    border: none;
    border-radius: var(--radius);
    background: transparent;
    color: var(--muted);
    cursor: pointer;
    transition: all var(--transition);
}

.btn-icon:hover {
    background: var(--surface-hover);
    color: var(--foreground);
}

/* Theme Toggle Icons */
[data-theme="light"] .icon-moon { display: none; }
[data-theme="dark"] .icon-sun { display: none; }

/* Glass Effect */
.glass {
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

[data-theme="dark"] .glass {
    background: rgba(26, 31, 46, 0.8);
}

/* Column */
.column {
    flex: 0 0 340px;
    max-height: 100%;
    display: flex;
    flex-direction: column;
    background: var(--surface);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    overflow: hidden;
    transition: flex var(--transition);
}

.column.collapsed {
    flex: 0 0 48px;
    min-width: 48px;
    background: var(--surface);
    transition: all var(--transition);
    cursor: pointer;
}

.column.collapsed:hover {
    background: var(--surface);
    box-shadow: var(--shadow-md);
}

.column.collapsed.drag-over {
    box-shadow: 0 0 0 2px var(--primary);
    background: var(--primary-subtle);
}

.column.drag-over {
    box-shadow: 0 0 0 2px var(--primary);
}

.column.column-dragging {
    cursor: grabbing;
}

.column-header[draggable="true"] {
    cursor: grab;
}

.column-header[draggable="true"]:active {
    cursor: grabbing;
}

.column-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 1.25rem;
    border-bottom: 1px solid var(--border);
    cursor: pointer;
    min-height: 60px;
}

.column.collapsed .column-header {
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    padding: 0.75rem 0.5rem;
    gap: 1rem;
    height: auto;
}

.column.collapsed .column-title {
    writing-mode: vertical-rl;
    text-orientation: mixed;
    font-size: 1.125rem;
}

.column.collapsed .column-title span:first-child {
    writing-mode: vertical-rl;
    text-orientation: mixed;
}

.column.collapsed .column-count {
    writing-mode: horizontal-tb;
    text-orientation: upright;
    padding: 0.25rem 0.5rem;
    font-size: 0.6875rem;
    font-weight: 600;
    background: var(--surface-hover);
    color: var(--muted);
    border-radius: var(--radius-sm);
    min-width: 1.5rem;
    text-align: center;
}

.column-title {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.5rem;
    font-weight: 600;
    letter-spacing: 0.02em;
    cursor: pointer;
}

.column-count {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--muted);
    background: var(--surface-hover);
    padding: 0.25rem 0.625rem;
    border-radius: var(--radius-sm);
}

.column-actions {
    display: flex;
    gap: 0.25rem;
    opacity: 0;
    transition: opacity var(--transition);
}

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

/* Hide actions on collapsed columns - click anywhere to expand */
.column.collapsed .column-actions {
    display: none;
}

.column-body {
    flex: 1;
    padding: 0.5rem;
    overflow-y: auto;
    min-height: 100px;
}

.column.collapsed .column-body {
    display: none;
}

.column-footer {
    padding: 0.5rem;
}

.column.collapsed .column-footer {
    display: none;
}

/* Add Card Button */
.btn-add-card {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    width: 100%;
    padding: 0.625rem;
    border: 1px dashed var(--border);
    border-radius: var(--radius);
    background: transparent;
    color: var(--muted);
    font-family: inherit;
    font-size: 0.875rem;
    cursor: pointer;
    transition: all var(--transition);
}

.btn-add-card:hover {
    border-color: var(--primary);
    border-style: solid;
    background: var(--primary-subtle);
    color: var(--primary);
}

.btn-add-card svg {
    transition: transform var(--transition);
}

.btn-add-card:hover svg {
    transform: scale(1.1);
}

/* Card */
.card {
    position: relative;
    background: var(--card-bg);
    border: 1px solid rgba(128, 128, 128, 0.15);
    border-radius: var(--radius);
    padding: 0.75rem;
    margin-bottom: 0.5rem;
    cursor: grab;
    transition: all var(--transition);
    animation: fadeInUp 0.2s ease;
}

.card.pinned {
    background: linear-gradient(135deg, var(--card-bg) 0%, rgba(249, 115, 22, 0.08) 100%);
    border-color: var(--accent);
}

.card-pin-indicator {
    position: absolute;
    top: 0.5rem;
    right: 0.5rem;
    color: var(--accent);
}

.card:hover {
    background: var(--surface-hover);
    box-shadow: var(--shadow);
}

.card.pinned:hover {
    background: linear-gradient(135deg, var(--surface-hover) 0%, rgba(249, 115, 22, 0.1) 100%);
}

.card.dragging {
    opacity: 0.5;
    cursor: grabbing;
}

.card-title {
    font-size: 1rem;
    font-weight: 500;
    margin-bottom: 0.5rem;
    word-break: break-word;
}

.card-meta {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.card-tags {
    display: flex;
    gap: 0.25rem;
    flex-wrap: wrap;
}

.card-tag {
    font-size: 0.6875rem;
    padding: 0.125rem 0.375rem;
    border-radius: var(--radius-sm);
    font-weight: 500;
}

.card-due {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    font-size: 0.75rem;
    color: var(--muted);
}

.card-due.overdue {
    color: var(--error);
}

.card-due.today {
    color: var(--warning);
}

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

.card-checklist {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    font-size: 0.75rem;
    color: var(--muted);
}

.card-checklist.complete {
    color: var(--success);
}

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

/* Modal */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: 1rem;
    animation: fadeIn 0.2s ease;
    backdrop-filter: blur(4px);
}

.modal {
    background: var(--surface);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    width: 100%;
    max-width: 500px;
    max-height: 90vh;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    animation: scaleIn 0.2s ease;
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 1.25rem;
    border-bottom: 1px solid var(--border);
}

.modal-header-actions {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.modal-header-actions .btn-icon.active {
    color: var(--accent);
}

.modal-title {
    font-size: 1.125rem;
    font-weight: 600;
}

.modal-body {
    padding: 1.25rem;
    overflow-y: auto;
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: 0.5rem;
    padding: 1rem 1.25rem;
    border-top: 1px solid var(--border);
}

/* Form Elements */
.form-group {
    margin-bottom: 1rem;
}

.form-label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: 0.375rem;
}

.form-input,
.form-textarea,
.form-select {
    width: 100%;
    padding: 0.625rem 0.75rem;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-family: inherit;
    font-size: 0.875rem;
    color: var(--foreground);
    background: var(--background);
    transition: all var(--transition);
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-subtle);
}

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

.form-input::placeholder,
.form-textarea::placeholder {
    color: var(--muted);
}

.form-error {
    font-size: 0.75rem;
    color: var(--error);
    margin-top: 0.25rem;
}

/* Color Picker */
.color-picker {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.color-option {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    border: 2px solid transparent;
    cursor: pointer;
    transition: all var(--transition);
}

.color-option:hover {
    transform: scale(1.1);
}

.color-option.selected {
    border-color: var(--foreground);
    box-shadow: 0 0 0 2px var(--background);
}

/* Subtasks */
.subtasks {
    margin-top: 1rem;
}

.subtasks-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 0.5rem;
}

.subtasks-title {
    font-size: 0.875rem;
    font-weight: 600;
}

.subtasks-progress {
    font-size: 0.75rem;
    color: var(--muted);
}

.subtasks-list {
    display: flex;
    flex-direction: column;
}

.subtask-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.375rem 0.25rem;
    border-radius: var(--radius-sm);
    margin: 0 -0.25rem;
    transition: background var(--transition);
}

.subtask-item:hover {
    background: var(--surface-hover);
}

.subtask-item:hover .subtask-delete {
    opacity: 1;
}

.subtask-checkbox {
    width: 18px;
    height: 18px;
    border: 2px solid var(--border);
    border-radius: var(--radius-sm);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition);
    flex-shrink: 0;
    background: transparent;
    color: transparent;
    padding: 0;
}

.subtask-checkbox:hover {
    border-color: var(--primary);
}

.subtask-checkbox.checked {
    background: var(--primary);
    border-color: var(--primary);
    color: white;
}

.subtask-checkbox.empty {
    border-color: transparent;
    pointer-events: none;
}

.subtask-text {
    flex: 1;
    font-size: 0.875rem;
    cursor: text;
    padding: 0.125rem 0;
    border-radius: var(--radius-sm);
}

.subtask-text:hover {
    background: var(--background);
}

.subtask-item.completed .subtask-text {
    text-decoration: line-through;
    color: var(--muted);
}

.subtask-input {
    flex: 1;
    font-size: 0.875rem;
    font-family: inherit;
    padding: 0.25rem 0.375rem;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--background);
    color: var(--foreground);
    outline: none;
}

.subtask-input:focus {
    border-color: var(--primary);
}

.subtask-input.editing {
    background: var(--background);
}

.subtask-add {
    opacity: 0.7;
}

.subtask-add:hover,
.subtask-add:focus-within {
    opacity: 1;
}

.subtask-add .subtask-input {
    border-color: transparent;
    background: transparent;
}

.subtask-add .subtask-input:focus {
    border-color: var(--border);
    background: var(--background);
}

.subtask-delete {
    opacity: 0;
    width: 24px;
    height: 24px;
    border: none;
    border-radius: var(--radius-sm);
    background: transparent;
    color: var(--muted);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition);
    flex-shrink: 0;
    padding: 0;
}

.subtask-delete:hover {
    background: var(--error-subtle);
    color: var(--error);
}

/* Dropdown */
.dropdown {
    position: relative;
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    right: 0;
    min-width: 160px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
    z-index: 100;
    padding: 0.25rem;
    animation: fadeInUp 0.15s ease;
}

.dropdown-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    width: 100%;
    padding: 0.5rem 0.75rem;
    border: none;
    border-radius: var(--radius-sm);
    background: transparent;
    color: var(--foreground);
    font-family: inherit;
    font-size: 0.875rem;
    cursor: pointer;
    text-align: left;
    transition: all var(--transition);
}

.dropdown-item:hover {
    background: var(--surface-hover);
}

.dropdown-item.danger {
    color: var(--error);
}

.dropdown-item.danger:hover {
    background: var(--error-subtle);
}

/* Tooltip */
[data-tooltip] {
    position: relative;
}

[data-tooltip]::after {
    content: attr(data-tooltip);
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%);
    padding: 0.375rem 0.625rem;
    background: var(--dark);
    color: white;
    font-size: 0.75rem;
    border-radius: var(--radius-sm);
    white-space: nowrap;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition);
    pointer-events: none;
}

[data-tooltip]:hover::after {
    opacity: 1;
    visibility: visible;
}

/* Loading Skeleton */
.skeleton {
    background: linear-gradient(
        90deg,
        var(--surface-hover) 25%,
        var(--border) 50%,
        var(--surface-hover) 75%
    );
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
    border-radius: var(--radius);
}

/* Quick Add Modal */
.quick-add-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: flex-start;
    justify-content: center;
    padding-top: 15vh;
    z-index: 1000;
    animation: fadeIn 0.15s ease;
    backdrop-filter: blur(4px);
}

.quick-add {
    background: var(--surface);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    width: 100%;
    max-width: 600px;
    animation: scaleIn 0.15s ease;
}

.quick-add-input {
    width: 100%;
    padding: 1rem 1.25rem;
    border: none;
    border-radius: var(--radius-lg);
    font-family: inherit;
    font-size: 1rem;
    color: var(--foreground);
    background: transparent;
    outline: none;
}

.quick-add-input::placeholder {
    color: var(--muted);
}

.quick-add-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.75rem 1.25rem;
    border-top: 1px solid var(--border);
    font-size: 0.75rem;
    color: var(--muted);
}

/* Toast */
.toast {
    position: fixed;
    bottom: 1.5rem;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0.875rem 1.25rem;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    z-index: 1000;
    animation: slideUp 0.3s ease;
}

.toast.fade-out {
    opacity: 0;
    transform: translateX(-50%) translateY(10px);
    transition: all 0.3s ease;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateX(-50%) translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateX(-50%) translateY(0);
    }
}

/* Kbd */
kbd {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 1.5em;
    padding: 0.125rem 0.375rem;
    font-family: inherit;
    font-size: 0.75rem;
    background: var(--surface-hover);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    box-shadow: 0 1px 0 var(--border);
}

/* Search Results */
.search-results {
    width: 100%;
    max-width: 900px;
}

.search-results-header {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.search-results-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 0.75rem;
    align-items: start;
}

@media (max-width: 600px) {
    .search-results-grid {
        grid-template-columns: 1fr;
    }
}

/* Sidebar Backdrop (Mobile) */
.sidebar-backdrop {
    display: none;
    position: fixed;
    inset: 0;
    top: var(--header-height);
    background: rgba(0, 0, 0, 0.5);
    z-index: 40;
    animation: fadeIn 0.2s ease;
}

.sidebar-backdrop.active {
    display: block;
}

/* Mobile Responsive */
@media (max-width: 768px) {
    .card {
        padding: 0.625rem;
    }

    .card-title {
        font-size: 0.8125rem;
    }

    .column-header {
        padding: 0.625rem 0.75rem;
        min-height: 44px;
    }

    .column-title {
        font-size: 0.9375rem;
    }

    .column-footer {
        padding: 0.375rem;
    }

    .btn-add-card {
        padding: 0.5rem;
        font-size: 0.8125rem;
    }

    .column.collapsed {
        flex: 0 0 40px;
        min-width: 40px;
    }

    .column.collapsed .column-header {
        padding: 0.625rem 0.375rem;
    }

    .column.collapsed .column-title {
        font-size: 0.875rem;
    }
}

@media (max-width: 480px) {
    .modal-body {
        padding: 1rem;
    }

    .modal-header,
    .modal-footer {
        padding: 0.75rem 1rem;
    }

    .form-group {
        margin-bottom: 0.75rem;
    }
}