:root {
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --secondary-color: #64748b;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    --bg-color: #ffffff;
    --bg-secondary: #f8fafc;
    --text-color: #1e293b;
    --text-secondary: #64748b;
    --border-color: #e2e8f0;
    --sidebar-bg: #1e293b;
    --sidebar-text: #e2e8f0;
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

[data-theme="dark"] {
    --bg-color: #0f172a;
    --bg-secondary: #1e293b;
    --text-color: #e2e8f0;
    --text-secondary: #94a3b8;
    --border-color: #334155;
    --sidebar-bg: #020617;
    --sidebar-text: #e2e8f0;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
}

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

/* Sidebar */
.sidebar {
    width: 250px;
    background-color: var(--sidebar-bg);
    color: var(--sidebar-text);
    padding: 1.5rem;
    position: fixed;
    height: 100vh;
    overflow-y: auto;
}

.sidebar-header h1 {
    font-size: 1.5rem;
    margin-bottom: 2rem;
    color: var(--primary-color);
}

.nav-menu {
    list-style: none;
}

.nav-menu li {
    margin-bottom: 0.5rem;
}

.nav-link {
    display: block;
    padding: 0.75rem 1rem;
    color: var(--sidebar-text);
    text-decoration: none;
    border-radius: 0.5rem;
    transition: background-color 0.2s;
}

.nav-link:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

.nav-link.active {
    background-color: var(--primary-color);
    color: white;
}

/* Main Content */
.main-content {
    flex: 1;
    margin-left: 250px;
    display: flex;
    flex-direction: column;
}

.top-header {
    background-color: var(--bg-color);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 100;
}

.breadcrumb {
    font-size: 1.5rem;
    font-weight: 600;
}

.header-actions {
    display: flex;
    gap: 1rem;
}

.btn-icon {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 0.5rem;
    transition: background-color 0.2s;
}

.btn-icon:hover {
    background-color: var(--bg-secondary);
}

.content-area {
    padding: 2rem;
    background-color: var(--bg-secondary);
    min-height: calc(100vh - 73px);
}

/* Pages */
.page {
    display: none;
}

.page.active {
    display: block;
}

.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
}

.page-header h2 {
    font-size: 1.5rem;
}

.page-actions {
    display: flex;
    gap: 1rem;
}

/* Buttons */
.btn-primary {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 0.5rem 1.5rem;
    border-radius: 0.5rem;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 500;
    transition: background-color 0.2s;
}

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

.btn-secondary {
    background-color: var(--secondary-color);
    color: white;
    border: none;
    padding: 0.5rem 1.5rem;
    border-radius: 0.5rem;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 500;
    transition: background-color 0.2s;
}

.btn-secondary:hover {
    opacity: 0.9;
}

.btn-danger {
    background-color: var(--danger-color);
    color: white;
    border: none;
    padding: 0.5rem 1.5rem;
    border-radius: 0.5rem;
    cursor: pointer;
    font-size: 0.875rem;
    transition: background-color 0.2s;
}

.btn-danger:hover {
    opacity: 0.9;
}

.btn-small {
    padding: 0.25rem 0.75rem;
    font-size: 0.875rem;
}

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.stat-card {
    background-color: var(--bg-color);
    border-radius: 0.5rem;
    padding: 1.5rem;
    box-shadow: var(--shadow);
}

.stat-card h3 {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
    text-transform: uppercase;
    font-weight: 600;
}

.stat-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.progress-bar {
    width: 100%;
    height: 8px;
    background-color: var(--bg-secondary);
    border-radius: 4px;
    overflow: hidden;
}

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

/* Dashboard Content */
.dashboard-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 1.5rem;
}

.dashboard-section {
    background-color: var(--bg-color);
    border-radius: 0.5rem;
    padding: 1.5rem;
    box-shadow: var(--shadow);
}

.dashboard-section h2 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
    border-bottom: 2px solid var(--primary-color);
    padding-bottom: 0.5rem;
}

/* Task List */
.task-list, .cert-list, .cal-list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.task-item, .cert-item, .cal-item {
    padding: 1rem;
    background-color: var(--bg-secondary);
    border-radius: 0.5rem;
    border-left: 4px solid var(--primary-color);
}

.task-item.overdue, .cert-item.expiring, .cal-item.overdue {
    border-left-color: var(--danger-color);
}

.task-item h4 {
    margin-bottom: 0.5rem;
    font-size: 1rem;
}

.task-meta {
    display: flex;
    gap: 1rem;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.alert-list .task-item {
    background-color: rgba(239, 68, 68, 0.1);
}

/* Data Tables */
.data-table {
    width: 100%;
    background-color: var(--bg-color);
    border-radius: 0.5rem;
    overflow: hidden;
    box-shadow: var(--shadow);
}

.data-table thead {
    background-color: var(--bg-secondary);
}

.data-table th {
    padding: 1rem;
    text-align: left;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    font-size: 0.875rem;
}

.data-table td {
    padding: 1rem;
    border-top: 1px solid var(--border-color);
}

.data-table tbody tr:hover {
    background-color: var(--bg-secondary);
}

/* Status Badges */
.status-badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    border-radius: 1rem;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
}

.status-not-started {
    background-color: #e2e8f0;
    color: #475569;
}

.status-in-progress {
    background-color: #dbeafe;
    color: #1e40af;
}

.status-completed {
    background-color: #d1fae5;
    color: #065f46;
}

.status-blocked {
    background-color: #fee2e2;
    color: #991b1b;
}

.status-draft {
    background-color: #f3f4f6;
    color: #374151;
}

.status-review {
    background-color: #fef3c7;
    color: #92400e;
}

.status-approved {
    background-color: #d1fae5;
    color: #065f46;
}

.status-open {
    background-color: #fee2e2;
    color: #991b1b;
}

.status-closed {
    background-color: #d1fae5;
    color: #065f46;
}

/* Filters */
.filters {
    display: flex;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.select-input {
    padding: 0.5rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    background-color: var(--bg-color);
    color: var(--text-color);
    font-size: 1rem;
    cursor: pointer;
}

/* Gantt Chart */
#gantt-container {
    background-color: var(--bg-color);
    border-radius: 0.5rem;
    padding: 2rem;
    box-shadow: var(--shadow);
    overflow-x: auto;
}

.gantt-not-started .bar {
    fill: #cbd5e1 !important;
}

.gantt-in-progress .bar {
    fill: #3b82f6 !important;
}

.gantt-completed .bar {
    fill: #10b981 !important;
}

.gantt-blocked .bar {
    fill: #ef4444 !important;
}

/* 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);
}

.modal.active {
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-content {
    background-color: var(--bg-color);
    border-radius: 0.5rem;
    max-width: 600px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    position: relative;
    box-shadow: var(--shadow-lg);
}

.modal-close {
    position: absolute;
    right: 1rem;
    top: 1rem;
    font-size: 2rem;
    cursor: pointer;
    color: var(--text-secondary);
}

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

#modal-body {
    padding: 2rem;
}

/* Toast */
.toast {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    background-color: var(--bg-color);
    color: var(--text-color);
    padding: 1rem 1.5rem;
    border-radius: 0.5rem;
    box-shadow: var(--shadow-lg);
    border-left: 4px solid var(--primary-color);
    display: none;
    z-index: 2000;
}

.toast.active {
    display: block;
    animation: slideIn 0.3s ease;
}

.toast.error {
    border-left-color: var(--danger-color);
}

.toast.success {
    border-left-color: var(--success-color);
}

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

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

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: var(--text-color);
}

.form-input, .form-textarea, .form-select {
    width: 100%;
    padding: 0.5rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    background-color: var(--bg-color);
    color: var(--text-color);
    font-size: 1rem;
}

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

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

/* Document Completion */
.doc-completion {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.doc-category-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem;
    background-color: var(--bg-secondary);
    border-radius: 0.5rem;
}

.doc-category-progress {
    width: 60%;
}

.doc-category-progress .progress-bar {
    margin-top: 0.25rem;
}

/* Risk Summary */
.risk-summary {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
}

.risk-stat {
    padding: 1rem;
    background-color: var(--bg-secondary);
    border-radius: 0.5rem;
    text-align: center;
}

.risk-stat .risk-count {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 0.25rem;
}

.risk-stat.critical .risk-count {
    color: var(--danger-color);
}

.risk-stat.high .risk-count {
    color: var(--warning-color);
}

.risk-stat.medium .risk-count {
    color: #6366f1;
}

.risk-stat.low .risk-count {
    color: var(--success-color);
}

/* Responsive */
@media (max-width: 768px) {
    .sidebar {
        width: 200px;
    }
    
    .main-content {
        margin-left: 200px;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .dashboard-content {
        grid-template-columns: 1fr;
    }
}