:root {
    --primary-color: #003366;
    --accent-color: #dc2626; /* Red accent for Swiss vibe */
    --bg-color: #f8fafc;
    --card-shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
}

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: #334155;
}

.navbar {
    background-color: #ffffff;
    box-shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1);
    padding: 1rem;
}

.navbar-brand {
    font-weight: 700;
    color: var(--primary-color);
    font-size: 1.3rem;
    display: flex;
    align-items: center;
}

.btn-primary {
    background-color: var(--primary-color);
    border: none;
    padding: 0.6rem 1.2rem;
    border-radius: 8px;
    font-weight: 500;
}

.btn-primary:hover {
    background-color: #004080; /* Lighter navy for hover */
}

.btn-success {
    background-color: #198754; /* Bootstrap Success Green */
    border: none;
    padding: 0.6rem 1.2rem;
    border-radius: 8px;
    font-weight: 500;
    color: white;
}

.btn-success:hover {
    background-color: #157347; /* Darker green for hover */
    color: white;
}

.card {
    border: none;
    border-radius: 12px;
    box-shadow: var(--card-shadow);
    background: white;
    margin-bottom: 20px;
}

.card-header {
    background: white;
    border-bottom: 1px solid #e2e8f0;
    font-weight: 600;
    padding: 1.2rem;
    border-radius: 12px 12px 0 0 !important;
}

.form-control, .form-select {
    border-radius: 8px;
    padding: 0.7rem;
    border: 1px solid #cbd5e1;
}

.form-control:focus, .form-select:focus {
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(220, 38, 38, 0.1);
}

.stat-card {
    background: linear-gradient(145deg, var(--primary-color), #1e293b);
    color: white;
}

optgroup { font-weight: bold; }

/* Filter buttons active state */
.btn-filter.active {
    background-color: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

/* Mobile Optimization */
@media (max-width: 768px) {
    /* --- Navbar Tweaks --- */
    .navbar-toggler {
        display: none !important; /* Hide hamburger */
    }
    .navbar-collapse {
        display: block !important; /* Force show menu */
    }
    .navbar-nav {
        flex-direction: row; /* Horizontal items */
        flex-wrap: wrap;
        justify-content: center;
        gap: 8px;
        margin-top: 5px;
    }
    .navbar-brand img {
        height: 40px !important; /* Resize logo slightly */
    }
    .navbar-brand {
        font-size: 1.1rem;
    }
    
    .container {
        padding-left: 12px;
        padding-right: 12px;
    }

    /* --- Flight List Streamlining --- */
    .table-responsive-stack thead {
        display: none; /* Hide Header */
    }
    .table-responsive-stack tr {
        display: flex;
        flex-wrap: wrap;
        margin-bottom: 1rem;
        background: white;
        padding: 12px;
        border-radius: 10px;
        box-shadow: 0 1px 3px rgba(0,0,0,0.05);
        border: 1px solid #e2e8f0;
    }
    .table-responsive-stack td {
        display: block;
        border: none;
        padding: 2px 0 !important; /* Force override Bootstrap padding utilities */
        text-align: left;
    }
    
    /* Remove Titles */
    .table-responsive-stack td:before {
        content: none !important; 
    }

    /* -- Data Layout -- */
    
    /* 1. Date/Time (Top Left) */
    .table-responsive-stack td[data-label="Datum / Zeit"] {
        width: 60%;
        order: 1;
        font-size: 1.1rem; /* Uniform size */
        font-weight: 600; /* Uniform weight */
        color: var(--primary-color);
    }
    
    /* 2. Mode Badge (Top Right) */
    .table-responsive-stack td[data-label="Flugart"] {
        width: 40%;
        order: 2;
        text-align: right;
    }
    
    /* 3. Pilot Name (Admin only) */
    .table-responsive-stack td[data-label="Pilot"] {
        width: 100%;
        order: 3;
        font-size: 1.1rem; /* Uniform size */
        font-weight: 600; /* Uniform weight */
        color: #333;
        margin-top: 2px;
        text-align: left; /* Ensure left alignment */
    }

    /* 4. Aircraft (Tail Number) */
    .table-responsive-stack td[data-label="Flugzeug"] {
        width: 100%;
        order: 4;
        font-size: 1.1rem; /* Uniform size */
        font-weight: 600; /* Uniform weight */
        color: #333;
        margin-top: 2px;
    }
    /* Hide Aircraft Type */
    .table-responsive-stack td[data-label="Flugzeug"] small {
        display: none;
    }

    /* 5. Destination (Left half of bottom row) */
    .table-responsive-stack td[data-label="Start / Ziel"] {
        width: 50%;
        order: 5;
        margin-top: 8px;
        font-weight: 500;
    }
    
    /* 6. Runway/Sector (Right half of bottom row) */
    .table-responsive-stack td[data-label="Piste / Sektor"] {
        width: 50%;
        order: 6;
        margin-top: 8px;
        text-align: right; /* Align right to balance the row */
    }

    /* 7. Action Buttons (Footer) */
    .table-responsive-stack td[data-label="Aktionen"] {
        width: 100%;
        order: 10;
        margin-top: 12px;
        padding-top: 10px;
        border-top: 1px solid #f1f5f9;
        display: flex;
        justify-content: flex-end;
        gap: 5px;
    }
}