:root {
    --bg-primary: #1a1a2e;
    --bg-secondary: #16213e;
    --bg-tertiary: #0f3460;
    --text-primary: #e6e6e6;
    --text-secondary: #b3b3b3;
    --accent-primary: #6c5ce7;
    --accent-secondary: #a29bfe;
    --border-color: #2d3436;
    --priority-critical: #e74c3c;
    --priority-high: #e67e22;
    --priority-medium: #3498db;
    --priority-low: #95a5a6;
    --status-todo: #95a5a6;
    --status-in-progress: #3498db;
    --status-review: #f39c12;
    --status-done: #2ecc71;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin: 0;
    padding: 0;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    transition: background-color 0.3s ease;
}

body.light-mode {
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-tertiary: #e9ecef;
    --text-primary: #212529;
    --text-secondary: #6c757d;
    --border-color: #dee2e6;
}

.app {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

nav {
    background-color: var(--bg-secondary);
    padding: 1rem 2rem;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-tertiary) 100%);
}

nav a {
    color: var(--text-primary);
    text-decoration: none;
    margin-right: 1.5rem;
    font-weight: 500;
    transition: color 0.2s ease;
}

nav a:hover {
    color: var(--accent-primary);
}

nav a.active {
    color: var(--accent-primary);
    font-weight: 600;
}

#navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
}

#navbar-left, #navbar-right {
    display: flex;
    align-items: center;
}

#navbar-left {
    gap: 1.5rem;
}

#navbar-right {
    gap: 1rem;
}

.main-content {
    flex: 1;
    padding: 2rem;
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
}

.footer {
    background-color: var(--bg-secondary);
    text-align: center;
    padding: 1rem;
    margin-top: auto;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.card {
    background-color: var(--bg-tertiary);
    border-radius: 8px;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.btn {
    background-color: var(--accent-primary);
    color: white;
    border: none;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    cursor: pointer;
    transition: background-color 0.2s ease;
    font-size: 0.9rem;
}

.btn:hover {
    background-color: var(--accent-secondary);
    transform: translateY(-2px);
    transition: all 0.2s ease;
}

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

.btn-secondary:hover {
    background-color: var(--border-color);
    transform: translateY(-2px);
    transition: all 0.2s ease;
}

.badge {
    display: inline-block;
    padding: 0.3rem 0.6rem;
    border-radius: 12px;
    font-size: 0.8rem;
    font-weight: 500;
}

.badge-critical {
    background-color: rgba(231, 76, 60, 0.2);
    color: var(--priority-critical);
}

.badge-high {
    background-color: rgba(230, 126, 34, 0.2);
    color: var(--priority-high);
}

.badge-medium {
    background-color: rgba(52, 152, 219, 0.2);
    color: var(--priority-medium);
}

.badge-low {
    background-color: rgba(149, 165, 166, 0.2);
    color: var(--priority-low);
}

.badge-todo {
    background-color: rgba(153, 153, 153, 0.2);
    color: var(--status-todo);
}

.badge-in-progress {
    background-color: rgba(52, 152, 219, 0.2);
    color: var(--status-in-progress);
}

.badge-review {
    background-color: rgba(243, 156, 18, 0.2);
    color: var(--status-review);
}

.badge-done {
    background-color: rgba(46, 204, 113, 0.2);
    color: var(--status-done);
}

.loading {
    text-align: center;
    padding: 2rem;
    color: var(--text-secondary);
}

.error {
    text-align: center;
    padding: 2rem;
    color: var(--priority-critical);
    background-color: rgba(231, 76, 60, 0.1);
    border-radius: 8px;
    margin: 1rem 0;
}

.table {
    width: 100%;
    border-collapse: collapse;
    margin: 1rem 0;
}

.table th,
.table td {
    padding: 0.75rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.table th {
    background-color: var(--bg-tertiary);
    font-weight: 600;
}

.table tr:hover {
    background-color: var(--border-color);
}

.progress-bar {
    width: 100%;
    height: 20px;
    background-color: var(--bg-tertiary);
    border-radius: 10px;
    overflow: hidden;
    margin: 1rem 0;
}

.progress-fill {
    height: 100%;
    background-color: var(--status-done);
    transition: width 0.3s ease;
}

.progress-text {
    text-align: right;
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-top: 0.25rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.filter-group {
    display: flex;
    gap: 1rem;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
}

.filter-group select,
.filter-group input {
    padding: 0.5rem;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
}

.filter-group select:focus,
.filter-group input:focus {
    outline: none;
    border-color: var(--accent-primary);
}

.kanban-board {
    display: flex;
    gap: 1.5rem;
    overflow-x: auto;
    padding: 1rem 0;
    flex: 1;
    min-height: 500px;
}

.kanban-column {
    flex: 1;
    min-width: 300px;
    background-color: var(--bg-tertiary);
    border-radius: 8px;
    padding: 1rem;
    display: flex;
    flex-direction: column;
    height: min-content;
    max-height: 100%;
}

.kanban-column h3 {
    margin-top: 0;
    margin-bottom: 1rem;
    color: var(--text-primary);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.task-card {
    background-color: var(--bg-primary);
    border-radius: 6px;
    padding: 1rem;
    margin-bottom: 1rem;
    border-left: 4px solid var(--status-in-progress);
    transition: all 0.2s ease;
    cursor: pointer;
}

.task-card:hover {
    background-color: var(--border-color);
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

@media (max-width: 768px) {
    .main-content {
        padding: 1rem;
    }
    
    nav {
        padding: 0.75rem 1rem;
    }
    
    #navbar-left {
        gap: 1rem;
    }
    
    #navbar-right {
        gap: 0.5rem;
    }
    
    nav a {
        margin-right: 1rem;
        font-size: 0.9rem;
    }
    
    .kanban-board {
        gap: 1rem;
    }
    
    .kanban-column {
        min-width: 250px;
    }
}