/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Color Palette */
    --primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --primary-solid: #667eea;
    --primary-dark: #5568d3;
    --secondary: #6c757d;
    --success: #10b981;
    --danger: #ef4444;
    --warning: #f59e0b;
    --info: #3b82f6;

    /* Neutral Colors */
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --bg-card: #1e293b;
    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --text-muted: #94a3b8;
    --border: #334155;

    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 30px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 20px rgba(102, 126, 234, 0.3);

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 0.75rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;

    /* Border Radius */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;

    /* Transitions */
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
}

/* Animated Background */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background:
        radial-gradient(circle at 20% 50%, rgba(102, 126, 234, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(118, 75, 162, 0.1) 0%, transparent 50%);
    pointer-events: none;
    z-index: 0;
}

.main-container {
    position: relative;
    z-index: 1;
}

/* Utility Classes */
.hidden {
    display: none !important;
}

/* Navigation */
.navbar {
    background: rgba(30, 41, 59, 0.8);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border);
    padding: var(--spacing-md) 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow-md);
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-brand h1 {
    background: var(--primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-size: 1.75rem;
    font-weight: 700;
    letter-spacing: -0.5px;
}

.nav-links {
    display: flex;
    gap: var(--spacing-lg);
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-sm);
}

.nav-link:hover {
    color: var(--text-primary);
    background: rgba(102, 126, 234, 0.1);
}

/* Auth Screen */
.auth-screen {
    min-height: calc(100vh - 80px);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-xl);
}

.auth-container {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    width: 100%;
    max-width: 450px;
    box-shadow: var(--shadow-lg);
    animation: fadeInUp 0.5s ease-out;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.auth-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.auth-header h1 {
    font-size: 2rem;
    margin-bottom: var(--spacing-sm);
    background: var(--primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.auth-header p {
    color: var(--text-muted);
}

.auth-tabs {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
    background: var(--bg-secondary);
    padding: 4px;
    border-radius: var(--radius-md);
}

.auth-tab {
    flex: 1;
    padding: var(--spacing-sm) var(--spacing-md);
    border: none;
    background: transparent;
    color: var(--text-secondary);
    font-weight: 500;
    cursor: pointer;
    border-radius: var(--radius-sm);
    transition: var(--transition);
}

.auth-tab.active {
    background: var(--primary-solid);
    color: white;
    box-shadow: var(--shadow-sm);
}

.auth-form {
    display: none;
}

.auth-form.active {
    display: block;
    animation: fadeIn 0.3s ease-out;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

/* Forms */
.form-group {
    margin-bottom: var(--spacing-lg);
}

.form-group label {
    display: block;
    margin-bottom: var(--spacing-xs);
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.9rem;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 1rem;
    transition: var(--transition);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-solid);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.form-group textarea {
    resize: vertical;
}

.form-message {
    margin-top: var(--spacing-md);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    display: none;
}

.form-message.error {
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid var(--danger);
    color: var(--danger);
    display: block;
}

.form-message.success {
    background: rgba(16, 185, 129, 0.1);
    border: 1px solid var(--success);
    color: var(--success);
    display: block;
}

/* Buttons */
.btn {
    padding: var(--spacing-sm) var(--spacing-lg);
    border: none;
    border-radius: var(--radius-sm);
    font-weight: 600;
    font-size: 0.95rem;
    cursor: pointer;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-family: inherit;
}

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

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md), var(--shadow-glow);
}

.btn-secondary {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border);
}

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

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

.btn-danger:hover {
    background: #dc2626;
    transform: translateY(-2px);
}

/* Dashboard */
.dashboard-screen {
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--spacing-xl);
}

.dashboard-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-xl);
}

.dashboard-header h2 {
    font-size: 2rem;
    font-weight: 700;
}

.boards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--spacing-lg);
}

.board-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    cursor: pointer;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.board-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: var(--primary);
}

.board-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-solid);
}

.board-card h3 {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-xs);
    color: var(--text-primary);
}

.board-card p {
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* Board Screen */
.board-screen {
    max-width: 100%;
    padding: var(--spacing-xl);
}

.board-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-xl);
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.board-info {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.board-info h2 {
    font-size: 1.75rem;
    font-weight: 700;
}

.board-actions {
    display: flex;
    gap: var(--spacing-md);
}

.board-content {
    display: flex;
    gap: var(--spacing-lg);
    overflow-x: auto;
    padding-bottom: var(--spacing-md);
}

/* Categories */
.category {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    min-width: 320px;
    max-width: 320px;
    flex-shrink: 0;
    display: flex;
    flex-direction: column;
    max-height: calc(100vh - 250px);
}

.category-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-sm);
    border-bottom: 1px solid var(--border);
}

.category-header h3 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
}

.category-actions {
    display: flex;
    gap: var(--spacing-xs);
}

.icon-btn {
    background: transparent;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: var(--spacing-xs);
    border-radius: var(--radius-sm);
    transition: var(--transition);
    font-size: 1.1rem;
}

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

.cards-container {
    flex: 1;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    padding: 2px;
}

.cards-container.drag-over {
    background: rgba(102, 126, 234, 0.1);
    border-radius: var(--radius-sm);
}

/* Cards */
.card {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    cursor: grab;
    transition: var(--transition);
    animation: slideIn 0.3s ease-out;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

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

.card-title {
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    color: var(--text-primary);
}

.card-description {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: var(--spacing-sm);
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.card-labels {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
}

.label {
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 600;
    color: white;
    display: inline-block;
}

.add-card-btn {
    width: 100%;
    padding: var(--spacing-sm);
    background: transparent;
    border: 2px dashed var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-muted);
    cursor: pointer;
    transition: var(--transition);
    font-weight: 500;
    margin-top: var(--spacing-sm);
}

.add-card-btn:hover {
    border-color: var(--primary-solid);
    color: var(--primary-solid);
    background: rgba(102, 126, 234, 0.05);
}

/* Modal */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: var(--spacing-lg);
}

.modal-content {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    width: 100%;
    max-width: 500px;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-lg);
    animation: modalSlideIn 0.3s ease-out;
}

@keyframes modalSlideIn {
    from {
        opacity: 0;
        transform: translateY(-50px) scale(0.95);
    }

    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

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

.modal-header h3 {
    font-size: 1.5rem;
    font-weight: 600;
}

.modal-close {
    background: transparent;
    border: none;
    font-size: 2rem;
    color: var(--text-muted);
    cursor: pointer;
    transition: var(--transition);
    line-height: 1;
    padding: 0;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
}

.modal-close:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.modal-content form {
    padding: var(--spacing-lg);
}

.modal-actions {
    display: flex;
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

/* Labels */
.labels-container {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.label-checkbox {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition);
    border: 2px solid transparent;
}

.label-checkbox:hover {
    background: rgba(255, 255, 255, 0.05);
}

.label-checkbox input[type="checkbox"] {
    cursor: pointer;
}

.labels-list {
    padding: var(--spacing-lg);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.label-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-sm);
    background: var(--bg-secondary);
    border-radius: var(--radius-sm);
}

.label-item .label {
    flex: 1;
}

.label-item button {
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: 0.85rem;
}

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

::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}

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

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

/* Responsive Design */
@media (max-width: 768px) {
    .nav-container {
        padding: 0 var(--spacing-md);
    }

    .dashboard-screen,
    .board-screen {
        padding: var(--spacing-md);
    }

    .boards-grid {
        grid-template-columns: 1fr;
    }

    .board-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .category {
        min-width: 280px;
        max-width: 280px;
    }
}

/* Sharing Components */
.autocomplete-container {
    position: relative;
}

.autocomplete-results {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    margin-top: 4px;
    max-height: 200px;
    overflow-y: auto;
    z-index: 10;
    box-shadow: var(--shadow-md);
    display: none;
}

.autocomplete-results.active {
    display: block;
}

.autocomplete-item {
    padding: var(--spacing-sm) var(--spacing-md);
    cursor: pointer;
    transition: var(--transition);
    border-bottom: 1px solid var(--border);
}

.autocomplete-item:last-child {
    border-bottom: none;
}

.autocomplete-item:hover {
    background: var(--bg-tertiary);
}

.autocomplete-item strong {
    color: var(--text-primary);
    display: block;
}

.autocomplete-item small {
    color: var(--text-muted);
    font-size: 0.85rem;
}

.permission-options {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
}

.permission-option {
    cursor: pointer;
}

.permission-option input[type="radio"] {
    display: none;
}

.permission-card {
    padding: var(--spacing-md);
    background: var(--bg-secondary);
    border: 2px solid var(--border);
    border-radius: var(--radius-md);
    transition: var(--transition);
    text-align: center;
}

.permission-card strong {
    display: block;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

.permission-card span {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.permission-option input[type="radio"]:checked+.permission-card {
    border-color: var(--primary-solid);
    background: rgba(102, 126, 234, 0.1);
}

.permission-option:hover .permission-card {
    border-color: var(--primary-solid);
}

.modal-body {
    padding: var(--spacing-lg);
}

.shares-section {
    margin-top: var(--spacing-xl);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--border);
}

.shares-section h4 {
    margin-bottom: var(--spacing-md);
    color: var(--text-secondary);
    font-size: 1rem;
}

.shares-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.share-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md);
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    transition: var(--transition);
}

.share-item:hover {
    border-color: var(--primary-solid);
}

.share-user-info {
    flex: 1;
}

.share-user-info strong {
    display: block;
    color: var(--text-primary);
    margin-bottom: 2px;
}

.share-user-info small {
    color: var(--text-muted);
    font-size: 0.85rem;
}

.share-permission {
    padding: 4px 12px;
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    font-weight: 600;
    margin-right: var(--spacing-md);
}

.share-permission.view {
    background: rgba(59, 130, 246, 0.2);
    color: var(--info);
}

.share-permission.edit {
    background: rgba(16, 185, 129, 0.2);
    color: var(--success);
}

.share-actions {
    display: flex;
    gap: var(--spacing-xs);
}

.share-actions select {
    padding: 4px 8px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: 0.85rem;
    cursor: pointer;
}

.share-actions button {
    padding: 4px 12px;
    font-size: 0.85rem;
}

.board-card .board-badge {
    position: absolute;
    top: 12px;
    right: 12px;
    padding: 4px 8px;
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 600;
}

.board-badge.shared {
    background: rgba(59, 130, 246, 0.2);
    color: var(--info);
}

.board-badge.owner {
    background: rgba(16, 185, 129, 0.2);
    color: var(--success);
}

.board-card .board-owner {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-top: var(--spacing-xs);
}

.empty-state {
    text-align: center;
    padding: var(--spacing-xl);
    color: var(--text-muted);
}

/* Remember Me Checkbox */
.remember-me-label {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    cursor: pointer;
    color: var(--text-secondary);
    font-weight: 400;
}

.remember-me-label input[type="checkbox"] {
    width: auto;
    cursor: pointer;
    margin: 0;
}

.remember-me-label span {
    user-select: none;
}

/* Toggle Switch */
.toggle-switch {
    position: relative;
    display: inline-block;
    width: 50px;
    height: 26px;
}

.toggle-switch input[type="checkbox"] {
    opacity: 0;
    width: 0;
    height: 0;
}

.toggle-slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--bg-tertiary);
    transition: var(--transition);
    border-radius: 26px;
    border: 1px solid var(--border);
}

.toggle-slider:before {
    position: absolute;
    content: "";
    height: 18px;
    width: 18px;
    left: 3px;
    bottom: 3px;
    background-color: var(--text-secondary);
    transition: var(--transition);
    border-radius: 50%;
}

.toggle-switch input:checked+.toggle-slider {
    background: var(--primary);
    border-color: var(--primary-solid);
}

.toggle-switch input:checked+.toggle-slider:before {
    transform: translateX(24px);
    background-color: white;
}

.toggle-switch input:focus+.toggle-slider {
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

/* Public Link Section */
.public-link-section {
    background: var(--bg-secondary);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    border: 1px solid var(--border);
}

.public-link-description {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-bottom: var(--spacing-md);
}

.public-link-toggle {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.toggle-label {
    color: var(--text-primary);
    font-weight: 500;
}

.public-link-container {
    margin-top: var(--spacing-md);
}

.public-link-display {
    display: flex;
    gap: var(--spacing-sm);
}

.public-link-display input {
    flex: 1;
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    color: var(--text-primary);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-sm);
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
}

.public-link-display button {
    white-space: nowrap;
}