:root {
    --color-primary: #4F46E5;
    --color-secondary: #7C3AED;
    --color-success: #10B981;
    --color-danger: #EF4444;
    --color-warning: #F59E0B;
    --color-bg: #F3F4F6;
    --color-card: #FFFFFF;
    --color-border: #E5E7EB;
    --color-text: #1F2937;
    --color-text-light: #6B7280;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
}

.app-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 20px;
}

/* Header */
header {
    background-color: var(--color-card);
    padding: 20px 30px;
    border-radius: 10px;
    box-shadow: var(--shadow-md);
    margin-bottom: 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

header h1 {
    color: var(--color-primary);
    font-size: 28px;
}

.header-actions {
    display: flex;
    gap: 10px;
    align-items: center;
}

/* Buttons */
.btn {
    padding: 10px 20px;
    border: none;
    border-radius: 6px;
    font-size: 12px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

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

.btn-primary:hover {
    background-color: #4338CA;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background-color: var(--color-text-light);
    color: white;
}

.btn-secondary:hover {
    background-color: #4B5563;
}

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

.btn-danger:hover {
    background-color: #DC2626;
}

.btn-small {
    padding: 6px 12px;
    font-size: 12px;
}

/* Owner Filter */
.owner-filter {
    padding: 10px 15px;
    border: 1px solid var(--color-border);
    border-radius: 6px;
    font-size: 14px;
    background-color: white;
    cursor: pointer;
}

/* Kanban Board */
.kanban-board {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.kanban-column {
    background-color: var(--color-card);
    border-radius: 10px;
    padding: 15px;
    box-shadow: var(--shadow-sm);
    min-height: 500px;
}

.column-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--color-border);
}

.column-header h2 {
    font-size: 18px;
    color: var(--color-text);
}

.task-count {
    background-color: var(--color-primary);
    color: white;
    padding: 4px 10px;
    border-radius: 12px;
    font-size: 14px;
    font-weight: 600;
}

/* Task List */
.task-list {
    min-height: 400px;
    padding: 5px;
}

.task-list.drag-over {
    background-color: #EEF2FF;
    border: 2px dashed var(--color-primary);
    border-radius: 8px;
}

/* Task Card (Sticky Note Style) */
.task-card {
    background: linear-gradient(135deg, #FEF3C7 0%, #FDE68A 100%);
    border-radius: 8px;
    padding: 15px;
    margin-bottom: 12px;
    box-shadow: var(--shadow-md);
    cursor: move;
    transition: all 0.3s ease;
    position: relative;
    border-left: 4px solid #F59E0B;
}

.task-card:hover {
    transform: translateY(-4px) rotate(1deg);
    box-shadow: var(--shadow-lg);
}

.task-card.dragging {
    opacity: 0.5;
    transform: rotate(5deg);
}

.task-card h3 {
    font-size: 16px;
    margin-bottom: 8px;
    color: var(--color-text);
}

.task-card p {
    font-size: 13px;
    color: var(--color-text-light);
    margin-bottom: 10px;
    overflow: hidden;
    text-overflow: ellipsis;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    line-clamp: 2;
    -webkit-box-orient: vertical;
}

.task-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 12px;
    color: var(--color-text-light);
}

.task-owner {
    display: flex;
    align-items: center;
    gap: 5px;
}

.task-badges {
    display: flex;
    gap: 5px;
}

.badge {
    padding: 3px 8px;
    border-radius: 12px;
    font-size: 11px;
    font-weight: 600;
}

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

.badge-comments {
    background-color: var(--color-primary);
    color: white;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.modal-content {
    background-color: white;
    margin: 5% auto;
    padding: 0;
    border-radius: 10px;
    width: 90%;
    max-width: 500px;
    max-height: 90vh;
    box-shadow: var(--shadow-lg);
    animation: slideIn 0.3s ease;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

@keyframes slideIn {
    from {
        transform: translateY(-50px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.modal-large {
    max-width: 800px;
    max-height: 90vh;
}

.modal-header {
    padding: 20px 30px;
    border-bottom: 1px solid var(--color-border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-shrink: 0;
}

.modal-header h2 {
    font-size: 22px;
    color: var(--color-text);
}

.close {
    font-size: 28px;
    font-weight: bold;
    color: var(--color-text-light);
    cursor: pointer;
    transition: color 0.3s;
}

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

/* Form */
form {
    padding: 30px;
    overflow-y: auto;
    max-height: calc(90vh - 120px);
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 5px;
    font-weight: 600;
    color: var(--color-text);
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 10px;
    border: 1px solid var(--color-border);
    border-radius: 6px;
    font-size: 14px;
    font-family: inherit;
}

.form-group textarea {
    resize: vertical;
}

.form-actions {
    display: flex;
    justify-content: flex-end;
    gap: 10px;
    margin-top: 20px;
}

/* Task Detail */
.task-detail-body {
    padding: 30px;
    overflow-y: auto;
    flex: 1;
    max-height: calc(90vh - 180px);
}

.task-info {
    margin-bottom: 30px;
}

.info-row {
    margin-bottom: 15px;
}

.info-row strong {
    display: block;
    margin-bottom: 5px;
    color: var(--color-text);
}

.status-badge {
    padding: 5px 12px;
    border-radius: 12px;
    font-size: 13px;
    font-weight: 600;
}

.status-planning {
    background-color: #DBEAFE;
    color: #1E40AF;
}

.status-progress {
    background-color: #FEF3C7;
    color: #92400E;
}

.status-completed {
    background-color: #D1FAE5;
    color: #065F46;
}

/* Blocker Section */
.blocker-section {
    background-color: #FEF2F2;
    padding: 15px;
    border-radius: 8px;
    border-left: 4px solid var(--color-danger);
}

.blocker-controls {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.blocker-controls label {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
}

/* Comments Section */
.comments-section {
    border-top: 1px solid var(--color-border);
    padding-top: 20px;
}

.comments-section h3 {
    margin-bottom: 15px;
    color: var(--color-text);
}

.add-comment {
    background-color: var(--color-bg);
    padding: 15px;
    border-radius: 8px;
    margin-bottom: 20px;
}

.add-comment input,
.add-comment textarea {
    width: 100%;
    padding: 10px;
    border: 1px solid var(--color-border);
    border-radius: 6px;
    margin-bottom: 10px;
    font-family: inherit;
}

.comments-list {
    max-height: 300px;
    overflow-y: auto;
}

.comment-item {
    background-color: var(--color-bg);
    padding: 12px;
    border-radius: 6px;
    margin-bottom: 10px;
}

.comment-header {
    display: flex;
    justify-content: space-between;
    margin-bottom: 5px;
}

.comment-author {
    font-weight: 600;
    color: var(--color-primary);
}

.comment-date {
    font-size: 12px;
    color: var(--color-text-light);
}

.comment-content {
    font-size: 14px;
    color: var(--color-text);
}

/* Modal Footer */
.modal-footer {
    padding: 20px 30px;
    border-top: 1px solid var(--color-border);
    display: flex;
    justify-content: space-between;
    flex-shrink: 0;
    background-color: white;
}

/* Analytics */
.analytics-body {
    padding: 30px;
    overflow-y: auto;
    flex: 1;
    max-height: calc(90vh - 180px);
}

.analytics-filters {
    display: flex;
    gap: 15px;
    margin-bottom: 30px;
    align-items: flex-end;
}

.analytics-filters label {
    display: flex;
    flex-direction: column;
    gap: 5px;
    font-weight: 600;
}

.analytics-filters input {
    padding: 8px;
    border: 1px solid var(--color-border);
    border-radius: 6px;
}

.analytics-card {
    background-color: var(--color-card);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    padding: 20px;
    margin-bottom: 15px;
}

.analytics-card h4 {
    color: var(--color-primary);
    margin-bottom: 15px;
}

.analytics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 15px;
}

.stat-box {
    background-color: var(--color-bg);
    padding: 15px;
    border-radius: 6px;
    text-align: center;
}

.stat-value {
    font-size: 28px;
    font-weight: 700;
    color: var(--color-primary);
}

.stat-label {
    font-size: 13px;
    color: var(--color-text-light);
    margin-top: 5px;
}

/* Deleted Tasks */
.deleted-tasks-body {
    padding: 30px;
    overflow-y: auto;
    flex: 1;
    max-height: calc(90vh - 120px);
}

.deleted-task-item {
    background-color: var(--color-bg);
    border-left: 4px solid var(--color-danger);
    padding: 15px;
    border-radius: 6px;
    margin-bottom: 15px;
}

.deleted-task-header {
    display: flex;
    justify-content: space-between;
    align-items: start;
    margin-bottom: 10px;
}

.deleted-task-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--color-text);
}

.deleted-task-meta {
    display: flex;
    gap: 15px;
    font-size: 13px;
    color: var(--color-text-light);
}

.deleted-task-description {
    font-size: 14px;
    color: var(--color-text);
    margin-top: 8px;
}

.deleted-task-info {
    display: flex;
    gap: 15px;
    margin-top: 10px;
    font-size: 12px;
}

.deleted-task-badge {
    padding: 3px 8px;
    border-radius: 12px;
    font-size: 11px;
    font-weight: 600;
}

/* Success Notification Toast */
.notification-toast {
    position: fixed;
    top: 20px;
    right: 20px;
    background: linear-gradient(135deg, var(--color-success) 0%, #059669 100%);
    color: white;
    padding: 16px 24px;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(16, 185, 129, 0.4);
    opacity: 0;
    transform: translateY(-20px);
    transition: all 0.3s ease;
    z-index: 10000;
    pointer-events: none;
    min-width: 300px;
}

.notification-toast.show {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
}

.notification-content {
    display: flex;
    align-items: center;
    gap: 12px;
}

.notification-icon {
    width: 28px;
    height: 28px;
    background-color: rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    font-weight: bold;
}

.notification-message {
    font-size: 15px;
    font-weight: 500;
}

/* Responsive Design */
@media (max-width: 768px) {
    .kanban-board {
        grid-template-columns: 1fr;
    }

    header {
        flex-direction: column;
        gap: 15px;
    }

    .header-actions {
        width: 100%;
        justify-content: space-between;
    }

    .modal-content {
        width: 95%;
        margin: 10% auto;
    }
    
    .notification-toast {
        right: 10px;
        left: 10px;
        min-width: auto;
    }
}