:root {
    /* Modern Minimalist Color Palette */
    --primary: #3b82f6;
    /* Blue 500 */
    --primary-hover: #2563eb;
    /* Blue 600 */
    --primary-light: #eff6ff;
    /* Blue 50 */
    --primary-dark: #1d4ed8;
    /* Blue 700 */

    --bg: #f8fafc;
    /* Slate 50 */
    --bg-secondary: #f1f5f9;
    /* Slate 100 */
    --card-bg: #ffffff;
    --panel-bg: #ffffff;

    --text: #0f172a;
    /* Slate 900 */
    --text-secondary: #334155;
    /* Slate 700 */
    --text-muted: #64748b;
    /* Slate 500 */
    --text-light: #94a3b8;
    /* Slate 400 */

    --border: #e2e8f0;
    /* Slate 200 */
    --border-hover: #cbd5e1;
    /* Slate 300 */

    --danger: #ef4444;
    /* Red 500 */
    --danger-hover: #dc2626;
    /* Red 600 */
    --danger-bg: #fef2f2;
    /* Red 50 */

    --success: #22c55e;
    /* Green 500 */
    --success-hover: #16a34a;
    /* Green 600 */
    --success-bg: #f0fdf4;
    /* Green 50 */

    --warning: #f59e0b;
    /* Amber 500 */

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);

    /* Radius */
    --radius-sm: 0.375rem;
    --radius: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-full: 9999px;

    /* Transitions */
    --transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--bg);
    color: var(--text);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    width: 100%;
    overflow-x: hidden;
}

#app {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    width: 100%;
}

/* Buttons */
.btn {
    display: inline-flex;
    justify-content: center;
    align-items: center;
    padding: 0.5rem 1rem;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-weight: 500;
    font-size: 0.875rem;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
    gap: 0.5rem;
    background-color: var(--card-bg);
    color: var(--text-secondary);
    box-shadow: var(--shadow-sm);
}

.btn:hover {
    background-color: var(--bg-secondary);
    border-color: var(--border-hover);
    color: var(--text);
}

.btn:focus {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}

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

.btn-primary:hover {
    background-color: var(--primary-hover);
    color: white;
    box-shadow: var(--shadow);
}

.btn-danger {
    background-color: var(--card-bg);
    color: var(--danger);
    border-color: var(--border);
}

.btn-danger:hover {
    background-color: var(--danger-bg);
    border-color: var(--danger);
    color: var(--danger-hover);
}

/* Auth Pages */
.auth-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 1rem;
    background-color: var(--bg);
}

.auth-card {
    background: var(--card-bg);
    padding: 2.5rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    width: 100%;
    max-width: 400px;
    border: 1px solid var(--border);
}

.auth-title {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 2rem;
    text-align: center;
    color: var(--text);
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
}

.form-input {
    width: 100%;
    padding: 0.625rem 0.875rem;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-size: 0.95rem;
    transition: var(--transition);
    background-color: var(--card-bg);
    color: var(--text);
    font-family: inherit;
}

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

.auth-link {
    display: block;
    text-align: center;
    margin-top: 1.5rem;
    color: var(--primary);
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 500;
    transition: var(--transition);
}

.auth-link:hover {
    color: var(--primary-hover);
    text-decoration: underline;
}

/* Dashboard */
.dashboard-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    padding: 1.5rem 2rem;
    background: var(--panel-bg);
    border-bottom: 1px solid var(--border);
}

.dashboard-header h1 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
    width: 100%;
}

.kanban-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
}

.kanban-card {
    background: var(--card-bg);
    padding: 1.5rem;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    text-decoration: none;
    color: inherit;
    display: flex;
    flex-direction: column;
}

.kanban-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary-light);
}

.kanban-title {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text);
}

.kanban-meta {
    color: var(--text-muted);
    font-size: 0.875rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

/* Kanban Board */
.board-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.5rem;
    background: var(--panel-bg);
    border-bottom: 1px solid var(--border);
}

.presence-banner {
    margin-left: 1rem;
    padding: 0.55rem 0.85rem;
    border-radius: var(--radius-full);
    background: var(--card-bg);
    border: 1px solid var(--border);
    color: var(--text);
    font-size: 0.9rem;
    font-weight: 600;
    opacity: 0;
    transform: translateY(-4px);
    transition: opacity 0.25s ease, transform 0.25s ease;
    white-space: nowrap;
}

.presence-banner.show {
    opacity: 1;
    transform: translateY(0);
}

.presence-banner.presence-join {
    border-color: var(--success);
    color: var(--success);
}

.presence-banner.presence-leave {
    border-color: var(--danger);
    color: var(--danger);
}

.board-header h1 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text);
}

.board-container {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1.25rem;
    padding: 1.5rem 2rem 2rem;
    overflow-x: hidden;
    height: calc(100vh - 80px);
    background-color: var(--bg);
    width: 100%;
    align-items: start;
}

.column {
    min-width: 0;
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    padding: 1rem;
    display: flex;
    flex-direction: column;
    height: 100%;
    max-height: 100%;
    border: 1px solid transparent;
}

.column-header {
    font-weight: 600;
    margin-bottom: 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.25rem 0.5rem;
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.column-header .count {
    background: var(--card-bg);
    padding: 0.125rem 0.5rem;
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-muted);
    border: 1px solid var(--border);
}

.task-list {
    flex: 1;
    overflow-y: auto;
    min-height: 100px;
    padding: 0.25rem;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

/* Custom Scrollbar */
.task-list::-webkit-scrollbar {
    width: 6px;
}

.task-list::-webkit-scrollbar-track {
    background: transparent;
}

.task-list::-webkit-scrollbar-thumb {
    background-color: var(--border);
    border-radius: var(--radius-full);
}

.task-list::-webkit-scrollbar-thumb:hover {
    background-color: var(--text-light);
}

@media (max-width: 1200px) {
    .board-container {
        grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
        height: auto;
        overflow-x: auto;
    }
}

@media (max-width: 768px) {
    .board-container {
        grid-template-columns: 1fr;
        padding: 1rem;
    }
}

.task-card {
    background: var(--card-bg);
    padding: 0;
    /* Remove padding from card, move to inner */
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border);
    cursor: default;
    /* Default cursor for card */
    transition: var(--transition);
    position: relative;
    display: flex;
    /* Flex layout for handle + content */
    overflow: hidden;
}

.task-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    border-color: var(--border-hover);
}

.task-card:active {
    cursor: default;
}

.task-card.dragging {
    opacity: 0.5;
    box-shadow: var(--shadow-lg);
}

.drag-handle {
    width: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-secondary);
    border-right: 1px solid var(--border);
    color: var(--text-muted);
    cursor: grab;
    flex-shrink: 0;
    transition: background 0.2s;
}

.drag-handle:hover {
    background: var(--border);
    color: var(--text);
}

.drag-handle:active {
    cursor: grabbing;
}

.task-inner {
    padding: 1rem;
    flex: 1;
    min-width: 0;
}

.task-body {
    display: flex;
    gap: 0.75rem;
    align-items: flex-start;
}

.task-icon {
    color: var(--text-muted);
    font-size: 0.875rem;
    margin-top: 0.25rem;
    flex-shrink: 0;
    opacity: 0.7;
}

.task-content {
    font-size: 0.95rem;
    color: var(--text);
    line-height: 1.5;
    word-break: break-word;
    flex: 1;
    outline: none;
    cursor: text;
    white-space: pre-wrap;
    /* Preserve newlines */
    /* Explicit text cursor */
}

.task-actions {
    display: flex;
    justify-content: space-between;
    /* Space between labels and edit button */
    align-items: center;
    gap: 0.5rem;
    margin-top: 0.75rem;
    padding-top: 0.75rem;
    border-top: 1px solid var(--bg);
    /* opacity: 0; Removed to keep badges visible */
    transition: var(--transition);
}

.task-labels-container {
    flex: 1;
    display: flex;
    flex-wrap: wrap;
    gap: 0.25rem;
}

.task-labels {
    display: flex;
    flex-wrap: wrap;
    gap: 0.25rem;
    /* Remove margin-bottom as it's now in actions row */
    margin-bottom: 0;
}

.edit-btn {
    opacity: 0;
    transition: var(--transition);
}

.task-card:hover .edit-btn {
    opacity: 1;
}

.delete-btn,
.edit-btn {
    background: transparent;
    border: none;
    cursor: pointer;
    font-size: 0.875rem;
    padding: 0.25rem;
    border-radius: var(--radius-sm);
    color: var(--text-light);
    transition: var(--transition);
}

.delete-btn:hover {
    color: var(--danger);
    background-color: var(--danger-bg);
}

.edit-btn:hover {
    color: var(--primary);
    background-color: var(--primary-light);
}

.add-task-btn {
    margin-top: 0.75rem;
    background: transparent;
    border: 1px dashed var(--border);
    color: var(--text-muted);
    width: 100%;
    padding: 0.75rem;
    border-radius: var(--radius);
    transition: var(--transition);
    font-size: 0.875rem;
    font-weight: 500;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.add-task-btn:hover {
    background: var(--card-bg);
    border-color: var(--primary);
    color: var(--primary);
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    justify-content: center;
    align-items: center;
    z-index: 50;
    opacity: 0;
    transition: opacity 0.2s ease;
}

.modal.active {
    display: flex;
    opacity: 1;
}

.modal-content {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: var(--radius-lg);
    width: 100%;
    max-width: 500px;
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border);
    transform: scale(0.95);
    transition: transform 0.2s ease;
}

.modal.active .modal-content {
    transform: scale(1);
}

.modal h2 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 1.5rem;
}

/* Toast Notifications */
#toast-container {
    position: fixed;
    bottom: 24px;
    right: 24px;
    z-index: 1000;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.toast {
    background: var(--card-bg);
    color: var(--text);
    padding: 1rem 1.25rem;
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
    display: flex;
    align-items: center;
    justify-content: space-between;
    min-width: 300px;
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.3s ease;
    border-left: 4px solid var(--border);
    font-size: 0.95rem;
}

.toast.show {
    opacity: 1;
    transform: translateY(0);
}

.toast-success {
    border-left-color: var(--success);
}

.toast-error {
    border-left-color: var(--danger);
}

.toast-info {
    border-left-color: var(--primary);
}

.toast-close {
    cursor: pointer;
    margin-left: 1rem;
    color: var(--text-light);
    transition: color 0.2s;
}

.toast-close:hover {
    color: var(--text);
}

/* Labels */
.label-badge {
    display: inline-block;
    padding: 0.125rem 0.5rem;
    font-size: 0.75rem;
    font-weight: 500;
    border-radius: var(--radius-full);
    margin-right: 0.25rem;
    margin-bottom: 0.25rem;
    color: #fff;
}

.task-labels {
    display: flex;
    flex-wrap: wrap;
    gap: 0.25rem;
    margin-bottom: 0.5rem;
}