:root {
    --primary-color: #4A90E2;
    --secondary-color: #50E3C2;
    --background-color: #000000;
    --card-bg: rgba(255, 255, 255, 0.05);
    --card-border: rgba(255, 255, 255, 0.1);
    --text-color: #ffffff;
    --text-secondary: rgba(255, 255, 255, 0.7);
    --success-color: #50E3C2;
    --warning-color: #FFB800;
    --danger-color: #FF6B6B;
    --todo-color: #4A90E2;
    --inprogress-color: #FFB800;
    --done-color: #50E3C2;
    --gradient: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
}

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

body {
    font-family: 'Inter', sans-serif;
    background: var(--background-color);
    color: var(--text-color);
    min-height: 100vh;
    padding: 2rem 1rem;
    line-height: 1.6;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
}

.header {
    text-align: center;
    margin-bottom: 2rem;
}

.header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.header h1 i {
    margin-right: 0.5rem;
    -webkit-text-fill-color: var(--primary-color);
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

.board-controls {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.btn-add-task,
.btn-export,
.btn-import {
    background: var(--gradient);
    color: var(--text-color);
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1rem;
}

.btn-add-task:hover,
.btn-export:hover,
.btn-import:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(74, 144, 226, 0.3);
}

.btn-export {
    background: rgba(80, 227, 194, 0.2);
    border: 1px solid rgba(80, 227, 194, 0.3);
}

.btn-export:hover {
    background: rgba(80, 227, 194, 0.3);
}

.btn-import {
    background: rgba(74, 144, 226, 0.2);
    border: 1px solid rgba(74, 144, 226, 0.3);
}

.btn-import:hover {
    background: rgba(74, 144, 226, 0.3);
}

.sort-controls {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.sort-label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-color);
    font-weight: 500;
    font-size: 0.9rem;
}

.sort-label i {
    color: var(--primary-color);
}

.sort-select {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 8px;
    padding: 0.5rem 2.5rem 0.5rem 0.75rem;
    color: var(--text-color);
    font-family: 'Inter', sans-serif;
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    appearance: none;
    -webkit-appearance: none;
    -moz-appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23ffffff' d='M6 9L1 4h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 0.75rem center;
    background-size: 12px;
    min-width: 150px;
}

.sort-select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(74, 144, 226, 0.1);
}

.sort-select:hover {
    background-color: rgba(255, 255, 255, 0.08);
    border-color: rgba(255, 255, 255, 0.2);
}

.sort-select option {
    background: var(--background-color);
    color: var(--text-color);
    padding: 0.5rem;
}

.kanban-board {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
    margin-top: 2rem;
}

.column {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 16px;
    padding: 1.5rem;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    min-height: 500px;
    display: flex;
    flex-direction: column;
}

.column-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.column-header h2 {
    font-size: 1.25rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.column[data-status="todo"] .column-header h2 i {
    color: var(--todo-color);
}

.column[data-status="inprogress"] .column-header h2 i {
    color: var(--inprogress-color);
}

.column[data-status="done"] .column-header h2 i {
    color: var(--done-color);
}

.task-count {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 12px;
    padding: 0.25rem 0.75rem;
    font-size: 0.875rem;
    font-weight: 600;
    min-width: 2rem;
    text-align: center;
}

.task-list {
    flex: 1;
    min-height: 200px;
    padding: 0.5rem 0;
}

.task-item {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 12px;
    padding: 1rem;
    margin-bottom: 0.75rem;
    cursor: grab;
    transition: all 0.3s ease;
    position: relative;
}

.task-item:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.task-item.dragging {
    opacity: 0.5;
    cursor: grabbing;
    transform: rotate(2deg);
}

.task-item.drag-over {
    border-color: var(--primary-color);
    background: rgba(74, 144, 226, 0.1);
    border-top: 3px solid var(--primary-color);
}

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

.task-title {
    font-weight: 600;
    font-size: 1rem;
    color: var(--text-color);
    flex: 1;
    word-break: break-word;
}

.task-actions {
    display: flex;
    gap: 0.5rem;
    opacity: 0;
    transition: opacity 0.2s ease;
}

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

.task-action-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 0.25rem;
    border-radius: 4px;
    transition: all 0.2s ease;
    font-size: 0.875rem;
}

.task-action-btn:hover {
    color: var(--text-color);
    background: rgba(255, 255, 255, 0.1);
}

.task-action-btn.edit:hover {
    color: var(--primary-color);
}

.task-action-btn.delete:hover {
    color: var(--danger-color);
}

.task-description {
    color: var(--text-secondary);
    font-size: 0.875rem;
    margin-bottom: 0.75rem;
    line-height: 1.5;
    word-break: break-word;
}

.task-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.75rem;
    gap: 0.5rem;
}

.task-footer-left {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.task-priority {
    display: inline-block;
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    font-weight: 500;
    font-size: 0.75rem;
    text-transform: uppercase;
}

.task-priority.low {
    background: rgba(74, 144, 226, 0.2);
    color: var(--todo-color);
}

.task-priority.medium {
    background: rgba(255, 184, 0, 0.2);
    color: var(--inprogress-color);
}

.task-priority.high {
    background: rgba(255, 107, 107, 0.2);
    color: var(--danger-color);
}

.task-date {
    color: var(--text-secondary);
    font-size: 0.75rem;
}

.task-user {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    color: var(--text-secondary);
    font-size: 0.75rem;
    margin-top: 0.5rem;
}

.task-user i {
    color: var(--primary-color);
    font-size: 0.7rem;
}

.task-timer-inline {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    color: var(--inprogress-color);
    font-size: 0.75rem;
    font-weight: 500;
    background: rgba(255, 184, 0, 0.15);
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    border: 1px solid rgba(255, 184, 0, 0.2);
}

.task-timer-inline i {
    color: var(--inprogress-color);
    font-size: 0.7rem;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.6;
    }
}

.task-time-spent-inline {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    color: var(--text-secondary);
    font-size: 0.75rem;
}

.task-time-spent-inline i {
    color: var(--secondary-color);
    font-size: 0.7rem;
}

.task-due-date {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    color: var(--text-secondary);
    font-size: 0.75rem;
    margin-top: 0.5rem;
}

.task-due-date i {
    color: var(--primary-color);
    font-size: 0.7rem;
}

.task-due-date.overdue {
    color: var(--danger-color);
    font-weight: 500;
}

.task-due-date.overdue i {
    color: var(--danger-color);
}

.empty-column {
    text-align: center;
    padding: 2rem;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.empty-column i {
    font-size: 2rem;
    margin-bottom: 0.5rem;
    opacity: 0.5;
}

/* Modal Styles */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(5px);
    -webkit-backdrop-filter: blur(5px);
    z-index: 1000;
    align-items: center;
    justify-content: center;
    padding: 1rem;
}

.modal.show {
    display: flex;
}

.modal-content {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 16px;
    width: 100%;
    max-width: 500px;
    max-height: 90vh;
    overflow-y: auto;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    animation: modalSlideIn 0.3s ease;
}

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

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.modal-header h2 {
    font-size: 1.5rem;
    font-weight: 600;
}

.modal-close {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 1.5rem;
    padding: 0.25rem;
    border-radius: 4px;
    transition: all 0.2s ease;
}

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

.modal-body {
    padding: 1.5rem;
}

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

.form-group label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
    color: var(--text-color);
    font-weight: 500;
    font-size: 0.875rem;
}

.form-group label i {
    color: var(--primary-color);
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 8px;
    padding: 0.75rem;
    color: var(--text-color);
    font-family: 'Inter', sans-serif;
    font-size: 1rem;
    transition: all 0.3s ease;
    appearance: none;
    -webkit-appearance: none;
    -moz-appearance: none;
}

.form-group select {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23ffffff' d='M6 9L1 4h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 0.75rem center;
    background-size: 12px;
    padding-right: 2.5rem;
    cursor: pointer;
}

.form-group select option {
    background: var(--background-color);
    color: var(--text-color);
    padding: 0.5rem;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(74, 144, 226, 0.1);
}

.form-group input[type="date"] {
    color-scheme: dark;
}

.form-group input[type="date"]::-webkit-calendar-picker-indicator {
    filter: invert(1);
    cursor: pointer;
}

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

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: 1rem;
    padding: 1.5rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.btn-cancel,
.btn-save {
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    border: none;
    font-size: 1rem;
}

.btn-cancel {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-color);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

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

.btn-save {
    background: var(--gradient);
    color: var(--text-color);
}

.btn-save:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(74, 144, 226, 0.3);
}

/* Toast Notification */
.toast {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 12px;
    padding: 1rem 1.5rem;
    display: none;
    align-items: center;
    gap: 0.75rem;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
    z-index: 2000;
    animation: slideIn 0.3s ease;
}

.toast.show {
    display: flex;
}

.toast i {
    color: var(--success-color);
    font-size: 1.2rem;
}

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

/* Responsive Design */
@media (max-width: 768px) {
    body {
        padding: 1rem 0.5rem;
    }

    .header h1 {
        font-size: 2rem;
    }

    .kanban-board {
        grid-template-columns: 1fr;
    }

    .column {
        min-height: 300px;
    }

    .modal-content {
        max-width: 100%;
    }
}

@media (max-width: 480px) {
    .header h1 {
        font-size: 1.75rem;
    }

    .board-controls {
        flex-direction: column;
    }

    .btn-add-task,
    .btn-export,
    .btn-import {
        width: 100%;
        justify-content: center;
    }

    .toast {
        bottom: 1rem;
        right: 1rem;
        left: 1rem;
    }
}

/* Footer */
.app-footer {
    text-align: center;
    padding: 2rem 1rem;
    margin-top: 3rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.app-footer p {
    color: var(--text-secondary);
    font-size: 0.875rem;
    margin: 0;
}

.app-footer a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color 0.3s ease;
}

.app-footer a:hover {
    color: var(--secondary-color);
    text-decoration: underline;
}

.app-footer .footer-link {
    color: var(--secondary-color);
}

.app-footer .footer-link:hover {
    color: var(--primary-color);
}

.app-footer .bmc-logo {
    display: inline-block;
    margin-top: 1rem;
    transition: transform 0.3s ease, opacity 0.3s ease;
}

.app-footer .bmc-logo:hover {
    transform: scale(1.05);
    opacity: 0.9;
}

.app-footer .bmc-logo img {
    height: 60px;
    width: 217px;
}

.app-footer .view-all-apps-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    margin: 1rem auto 0 auto;
    padding: 0.75rem 1.5rem;
    background: linear-gradient(45deg, var(--primary-color), var(--secondary-color));
    color: #ffffff;
    text-decoration: none;
    border-radius: 8px;
    font-weight: 600;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
    width: fit-content;
}

.app-footer .view-all-apps-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(0, 242, 255, 0.3);
    text-decoration: none;
}