/* Genel Ayarlar */
body {
    background-color: #f4f7f6;
    font-family: 'Inter', sans-serif; /* Eğer Google Fonts eklersen çok şık durur */
}

/* Sidebar Tasarımı */
.sidebar {
    min-height: 100vh;
    background: #1a1d20; /* Biraz daha derin bir siyah/gri */
    color: #ced4da;
    box-shadow: 4px 0 10px rgba(0,0,0,0.05);
}

.nav-link {
    color: #adb5bd;
    font-weight: 500;
    padding: 12px 15px;
    transition: all 0.3s ease;
}

.nav-link:hover {
    color: #fff;
    background: rgba(255,255,255,0.05);
    transform: translateX(5px); /* Hafif sağa kayma efekti */
}

.nav-link.active {
    color: #fff !important;
    background: #0d6efd !important;
    box-shadow: 0 4px 12px rgba(13, 110, 253, 0.3);
}

/* Kartlar ve Tablolar */
.card {
    border: none;
    border-radius: 12px;
    transition: transform 0.2s;
}

.table thead {
    background-color: #f8f9fa;
    text-transform: uppercase;
    font-size: 0.8rem;
    letter-spacing: 1px;
}

/* Custom Scrollbar (Sidebar için) */
.sidebar::-webkit-scrollbar {
    width: 5px;
}
.sidebar::-webkit-scrollbar-thumb {
    background: #343a40;
    border-radius: 10px;
}

.assignment-card { border-left: 5px solid #0d6efd; }


.login-card {
            width: 100%;
            max-width: 400px;
            border: none;
            border-radius: 15px;
            box-shadow: 0 10px 30px rgba(0,0,0,0.1);
            margin-top: 50% !important;
        }
        .card-header {
            background-color: #212529; /* Panel sidebar rengiyle aynı */
            color: white;
            text-align: center;
            border-radius: 15px 15px 0 0 !important;
            padding: 1.5rem;
        }
        .btn-primary {
            background-color: #0d6efd;
            border: none;
            padding: 10px;
            font-weight: 600;
        }
        .form-control:focus {
            border-color: #0d6efd;
            box-shadow: 0 0 0 0.25 row rgba(13, 110, 253, 0.25);
        }