:root {
    --sidebar-width: 240px;
    --bg-primary: #0d1117;
    --bg-secondary: #161b22;
    --bg-card: #1c2333;
    --border-color: #30363d;
    --text-primary: #e6edf3;
    --text-muted: #8b949e;
    --accent-blue: #58a6ff;
    --accent-green: #3fb950;
    --accent-red: #f85149;
    --accent-orange: #d29922;
    --accent-purple: #bc8cff;
}

body {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
    min-height: 100vh;
}

/* Sidebar */
.sidebar {
    width: var(--sidebar-width);
    min-height: 100vh;
    position: fixed;
    top: 0;
    left: 0;
    z-index: 1000;
    display: flex;
    flex-direction: column;
    background-color: var(--bg-secondary) !important;
}

.sidebar .nav-link {
    border-radius: 6px;
    margin: 2px 0;
    padding: 8px 12px;
    font-size: 0.9rem;
    transition: background-color 0.2s;
}

.sidebar .nav-link:hover {
    background-color: rgba(88, 166, 255, 0.1);
}

.sidebar .nav-link.active {
    background-color: rgba(88, 166, 255, 0.15);
    color: var(--accent-blue) !important;
}

.main-content {
    margin-left: var(--sidebar-width);
    min-height: 100vh;
    padding: 0;
}

/* Cards */
.stat-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 20px;
    transition: transform 0.2s, box-shadow 0.2s;
}

.stat-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.3);
}

.stat-card .stat-value {
    font-size: 2rem;
    font-weight: 700;
}

.stat-card .stat-label {
    font-size: 0.85rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* Machine Cards */
.machine-card {
    background: var(--bg-card);
    border: 2px solid var(--border-color);
    border-radius: 10px;
    padding: 15px;
    cursor: pointer;
    transition: all 0.2s;
    min-width: 180px;
}

.machine-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 16px rgba(0,0,0,0.4);
}

.machine-card.util-high { border-color: var(--accent-red); }
.machine-card.util-medium { border-color: var(--accent-orange); }
.machine-card.util-low { border-color: var(--accent-green); }
.machine-card.util-none { border-color: var(--border-color); }

/* Capability Group */
.capability-group {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 20px;
    margin-bottom: 20px;
}

.capability-group h5 {
    color: var(--accent-purple);
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 10px;
    margin-bottom: 15px;
}

/* Progress/Utilization Bars */
.utilization-bar {
    height: 8px;
    border-radius: 4px;
    background: #2d333b;
    overflow: hidden;
}

.utilization-bar .bar-fill {
    height: 100%;
    border-radius: 4px;
    transition: width 0.5s ease;
}

.bar-fill.high { background: var(--accent-red); }
.bar-fill.medium { background: var(--accent-orange); }
.bar-fill.low { background: var(--accent-green); }

/* Tables */
.table-dark-custom {
    --bs-table-bg: var(--bg-card);
    --bs-table-border-color: var(--border-color);
}

.table-dark-custom thead th {
    background: var(--bg-secondary);
    color: var(--accent-blue);
    font-weight: 600;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border-bottom: 2px solid var(--accent-blue);
}

/* Badges */
.badge-aselsan { background-color: #1565C0; }
.badge-tai { background-color: #2E7D32; }
.badge-roketsan { background-color: #E65100; }

/* Forms */
.form-control, .form-select {
    background-color: var(--bg-secondary);
    border-color: var(--border-color);
    color: var(--text-primary);
}

.form-control:focus, .form-select:focus {
    background-color: var(--bg-secondary);
    border-color: var(--accent-blue);
    color: var(--text-primary);
    box-shadow: 0 0 0 0.2rem rgba(88, 166, 255, 0.25);
}

/* Login page (no sidebar) */
.login-container {
    max-width: 400px;
    margin: 100px auto;
}

.login-container .card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
}

/* Section header */
.section-header {
    padding: 20px 25px;
    border-bottom: 1px solid var(--border-color);
    background: var(--bg-secondary);
}

.section-header h4 {
    margin: 0;
    font-weight: 600;
}

.page-content {
    padding: 25px;
}

/* Import cards */
.import-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 20px;
    margin-bottom: 15px;
}

/* Modal styling */
.modal-content {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
}

/* Responsive */
@@media (max-width: 768px) {
    .sidebar { display: none; }
    .main-content { margin-left: 0; }
}