:root {
    /* Dark Premium Theme */
    --bg-color: #0f0f23;
    --bg-secondary: #1a1a2e;
    --bg-gradient: linear-gradient(135deg, #0f0f23 0%, #1a1a2e 50%, #16213e 100%);
    --text-color: #e4e4e7;
    --text-muted: #71717a;
    --primary-color: #6366f1;
    --primary-hover: #818cf8;
    --primary-glow: rgba(99, 102, 241, 0.4);
    --danger-color: #ef4444;
    --danger-glow: rgba(239, 68, 68, 0.3);
    --success-color: #22c55e;
    --warning-color: #f59e0b;
    --surface-color: rgba(30, 30, 50, 0.7);
    --surface-solid: #1e1e32;
    --column-bg: rgba(26, 26, 46, 0.8);
    --border-color: rgba(255, 255, 255, 0.08);
    --border-radius: 12px;
    --shadow: 0 4px 24px rgba(0, 0, 0, 0.3);
    --shadow-glow: 0 0 30px rgba(99, 102, 241, 0.15);
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);

    /* Priority Colors */
    --prio-1: #52525b;
    --prio-2: #22c55e;
    --prio-3: #f59e0b;
    --prio-4: #ef4444;
}

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

body {
    font-family: var(--font-family);
    background: var(--bg-gradient);
    color: var(--text-color);
    height: 100vh;
    overflow: hidden;
    line-height: 1.5;
}

/* Scrollbar Styling */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

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

::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.15);
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.25);
}

.hidden {
    display: none !important;
}

/* Buttons */
.btn {
    padding: 10px 20px;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
    font-family: inherit;
    font-size: 0.9rem;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color) 0%, #8b5cf6 100%);
    color: white;
    box-shadow: 0 4px 15px var(--primary-glow);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 25px var(--primary-glow);
}

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

.btn-outline {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: white;
    backdrop-filter: blur(10px);
}

.btn-outline:hover {
    background: rgba(255, 255, 255, 0.15);
    border-color: rgba(255, 255, 255, 0.3);
}

.btn-ghost {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-color);
    width: 100%;
    text-align: left;
    justify-content: flex-start;
}

.btn-ghost:hover {
    background: rgba(255, 255, 255, 0.1);
}

.btn-sm {
    padding: 6px 12px;
    font-size: 0.8rem;
}

.btn-danger {
    background: linear-gradient(135deg, var(--danger-color) 0%, #dc2626 100%);
    color: white;
    box-shadow: 0 4px 15px var(--danger-glow);
}

.btn-danger:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 25px var(--danger-glow);
}

/* Login Screen */
#login-screen {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    background: var(--bg-gradient);
    position: relative;
    overflow: hidden;
}

#login-screen::before {
    content: '';
    position: absolute;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, var(--primary-glow) 0%, transparent 70%);
    top: -200px;
    right: -200px;
    animation: pulse 4s ease-in-out infinite;
}

#login-screen::after {
    content: '';
    position: absolute;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(139, 92, 246, 0.2) 0%, transparent 70%);
    bottom: -150px;
    left: -150px;
    animation: pulse 4s ease-in-out infinite 2s;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); opacity: 0.5; }
    50% { transform: scale(1.1); opacity: 0.8; }
}

.login-container {
    background: var(--surface-color);
    backdrop-filter: blur(20px);
    padding: 3rem;
    border-radius: 20px;
    box-shadow: var(--shadow), var(--shadow-glow);
    width: 100%;
    max-width: 420px;
    text-align: center;
    border: 1px solid var(--border-color);
    position: relative;
    z-index: 1;
    animation: fadeIn 0.5s ease-out;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.login-container h1 {
    margin-bottom: 0.5rem;
    font-size: 2rem;
    background: linear-gradient(135deg, var(--primary-color) 0%, #a78bfa 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.login-container > p {
    color: var(--text-muted);
    margin-bottom: 2rem;
    font-size: 0.95rem;
}

.form-group {
    margin-bottom: 1.25rem;
    text-align: left;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--border-color);
    border-radius: 10px;
    font-family: inherit;
    font-size: 1rem;
    background: rgba(0, 0, 0, 0.3);
    color: var(--text-color);
    transition: var(--transition);
}

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

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    border-color: var(--primary-color);
    outline: none;
    box-shadow: 0 0 0 4px var(--primary-glow);
}

.error-message {
    color: var(--danger-color);
    margin-top: 1rem;
    font-size: 0.9rem;
    font-weight: 500;
}

/* Board Screen */
#board-screen {
    display: flex;
    flex-direction: column;
    height: 100vh;
    animation: fadeIn 0.3s ease-out;
}

.board-header {
    background: rgba(15, 15, 35, 0.95);
    backdrop-filter: blur(20px);
    color: white;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.board-header .logo {
    font-weight: 800;
    font-size: 1.5rem;
    background: linear-gradient(135deg, var(--primary-color) 0%, #a78bfa 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    display: flex;
    align-items: center;
    gap: 10px;
}

.board-header .logo::before {
    content: '📋';
    font-size: 1.3rem;
}

.user-info {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.user-info #user-display {
    padding: 8px 16px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 20px;
    font-weight: 600;
    font-size: 0.9rem;
}

.user-info #user-display::before {
    content: '👤 ';
}

.board-container {
    flex: 1;
    overflow-x: auto;
    padding: 2rem;
    display: flex;
    align-items: flex-start;
}

.board {
    display: flex;
    align-items: flex-start;
    gap: 1.25rem;
}

.column {
    background: var(--column-bg);
    backdrop-filter: blur(10px);
    width: 320px;
    min-width: 320px;
    border-radius: var(--border-radius);
    display: flex;
    flex-direction: column;
    max-height: calc(100vh - 140px);
    border: 1px solid var(--border-color);
    transition: var(--transition);
    box-shadow: var(--shadow);
}

.column:hover {
    border-color: rgba(255, 255, 255, 0.15);
    box-shadow: var(--shadow), 0 0 20px rgba(99, 102, 241, 0.1);
}

.column-header {
    padding: 16px;
    font-weight: 700;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: grab;
    border-bottom: 1px solid var(--border-color);
}

.column-title {
    flex: 1;
    margin-right: 8px;
    font-size: 1rem;
    display: flex;
    align-items: center;
    gap: 10px;
}

.column-actions {
    opacity: 0;
    transition: var(--transition);
    display: flex;
    gap: 4px;
}

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

.icon-btn {
    background: rgba(255, 255, 255, 0.1);
    border: none;
    cursor: pointer;
    font-size: 0.9rem;
    color: var(--text-muted);
    padding: 6px 8px;
    border-radius: 6px;
    transition: var(--transition);
}

.icon-btn:hover {
    background: rgba(255, 255, 255, 0.2);
    color: var(--text-color);
    transform: scale(1.1);
}

.task-list {
    padding: 12px;
    flex: 1;
    overflow-y: auto;
    min-height: 60px;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.task {
    background: var(--surface-solid);
    padding: 14px;
    border-radius: 10px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
    cursor: grab;
    position: relative;
    border-left: 4px solid transparent;
    transition: var(--transition);
    border: 1px solid var(--border-color);
}

.task:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.3);
    border-color: rgba(255, 255, 255, 0.15);
}

.task.sortable-ghost {
    opacity: 0.5;
    transform: rotate(3deg);
}

.task.sortable-chosen {
    box-shadow: 0 10px 40px rgba(99, 102, 241, 0.3);
}

.task-priority-1 {
    border-left-color: var(--prio-1);
}

.task-priority-2 {
    border-left-color: var(--prio-2);
}

.task-priority-3 {
    border-left-color: var(--prio-3);
}

.task-priority-4 {
    border-left-color: var(--prio-4);
    animation: urgentPulse 2s infinite;
}

@keyframes urgentPulse {
    0%, 100% { box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2); }
    50% { box-shadow: 0 2px 15px var(--danger-glow); }
}

.task-title {
    font-weight: 600;
    margin-bottom: 8px;
    font-size: 0.95rem;
    line-height: 1.4;
}

.task-meta {
    font-size: 0.75rem;
    color: var(--text-muted);
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
}

.task-actions {
    display: flex;
    gap: 4px;
    opacity: 0;
    transition: var(--transition);
}

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

.task-actions .icon-btn {
    padding: 4px 6px;
    font-size: 0.8rem;
}

.add-task-btn {
    margin: 8px 12px 12px 12px;
    background: transparent;
    color: var(--text-muted);
    text-align: left;
    padding: 10px 12px;
    border-radius: 8px;
    cursor: pointer;
    border: 2px dashed var(--border-color);
    font-family: inherit;
    font-size: 0.9rem;
    font-weight: 500;
    transition: var(--transition);
}

.add-task-btn:hover {
    background: rgba(99, 102, 241, 0.1);
    color: var(--primary-color);
    border-color: var(--primary-color);
}

.add-column-container {
    min-width: 320px;
}

.add-column-container .btn-ghost {
    padding: 16px;
    border-radius: var(--border-radius);
    border: 2px dashed var(--border-color);
    font-weight: 600;
}

.add-column-container .btn-ghost:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
    background: rgba(99, 102, 241, 0.1);
}

/* Modal */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(8px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    animation: fadeIn 0.2s ease-out;
}

.modal-content {
    background: var(--surface-solid);
    padding: 2rem;
    border-radius: 16px;
    width: 100%;
    max-width: 480px;
    position: relative;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow), var(--shadow-glow);
    animation: modalSlide 0.3s ease-out;
}

@keyframes modalSlide {
    from { opacity: 0; transform: translateY(-30px) scale(0.95); }
    to { opacity: 1; transform: translateY(0) scale(1); }
}

.close-modal {
    position: absolute;
    top: 1rem;
    right: 1.5rem;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-muted);
    transition: var(--transition);
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 8px;
}

.close-modal:hover {
    color: var(--text-color);
    background: rgba(255, 255, 255, 0.1);
}

.modal h2 {
    margin-bottom: 1.5rem;
    font-size: 1.5rem;
    background: linear-gradient(135deg, var(--text-color) 0%, var(--text-muted) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.modal-actions {
    display: flex;
    justify-content: flex-end;
    gap: 1rem;
    margin-top: 2rem;
}

/* Error Modal Specifics */
.error-modal-content {
    border-top: 4px solid var(--danger-color);
    box-shadow: var(--shadow), 0 0 40px var(--danger-glow);
}

.error-modal-content h2 {
    color: var(--danger-color);
    -webkit-text-fill-color: var(--danger-color);
}

/* Task Error Display */
.task-error {
    margin-top: 10px;
    padding: 10px 12px;
    background: rgba(239, 68, 68, 0.15);
    border: 1px solid rgba(239, 68, 68, 0.3);
    border-radius: 8px;
    color: #fca5a5;
    font-size: 0.8rem;
    display: flex;
    align-items: flex-start;
    gap: 8px;
}

.task-error-icon {
    font-size: 1rem;
    flex-shrink: 0;
}

.task-error-text {
    word-break: break-word;
    line-height: 1.4;
}

/* Task count badge */
.task-count {
    background: var(--primary-color);
    color: white;
    padding: 2px 8px;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 700;
    margin-left: auto;
}

/* Assigned indicator */
.task[data-assigned="true"] {
    border-right: 3px solid var(--primary-color);
}

/* Empty state */
.task-list:empty::after {
    content: 'Brak zadań';
    display: block;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.85rem;
    padding: 20px;
    opacity: 0.6;
}

/* Drag placeholder */
.blue-background-class {
    background: rgba(99, 102, 241, 0.2) !important;
    border: 2px dashed var(--primary-color) !important;
    border-radius: 10px;
}

/* Responsive */
@media (max-width: 768px) {
    .board-header {
        padding: 1rem;
    }
    
    .board-container {
        padding: 1rem;
    }
    
    .column {
        width: 280px;
        min-width: 280px;
    }
    
    .login-container {
        margin: 1rem;
        padding: 2rem;
    }
}