body {
    background: #f5f7fb;
    font-family: Arial, Helvetica, sans-serif;
}

.login-page {
    background: linear-gradient(135deg, #eef3ff, #ffffff);
}

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

.sidebar {
    width: 260px;
    background: #111827;
    color: #fff;
    transition: all .3s ease;
    position: fixed;
    height: 100vh;
    z-index: 1000;
}

.sidebar .brand {
    padding: 20px;
    font-weight: bold;
    border-bottom: 1px solid rgba(255,255,255,.1);
}

.sidebar a {
    color: #d1d5db;
    text-decoration: none;
    display: block;
    padding: 12px 20px;
    font-size: 15px;
}

.sidebar a:hover,
.sidebar a.active {
    background: #1f2937;
    color: #fff;
}

.content {
    margin-left: 260px;
    width: calc(100% - 260px);
    padding: 20px;
}

.topbar {
    background: #fff;
    border-radius: 14px;
    padding: 14px 18px;
    margin-bottom: 20px;
    box-shadow: 0 3px 12px rgba(0,0,0,.04);
}

.card {
    border-radius: 14px;
}

.table td,
.table th {
    vertical-align: middle;
}

@media (max-width: 991px) {
    .sidebar {
        left: -260px;
    }

    .sidebar.active {
        left: 0;
    }

    .content {
        margin-left: 0;
        width: 100%;
    }
}


.file-icon {
    width: 42px;
    height: 42px;
    border-radius: 12px;
    background: #eef2ff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 22px;
    flex-shrink: 0;
}

@media (max-width: 576px) {
    .file-icon {
        width: 38px;
        height: 38px;
        font-size: 20px;
    }
}


.mobile-student-card {
    background: #fff;
    border-radius: 18px;
    padding: 16px;
    box-shadow: 0 4px 16px rgba(0,0,0,.06);
    border: 1px solid #eef0f4;
}

.mobile-info-list {
    display: grid;
    gap: 10px;
}

.mobile-info-list div {
    background: #f8fafc;
    border-radius: 12px;
    padding: 10px 12px;
}

.mobile-info-list span {
    display: block;
    font-size: 12px;
    color: #6b7280;
    margin-bottom: 2px;
}

.mobile-info-list strong {
    display: block;
    font-size: 14px;
    color: #111827;
    word-break: break-word;
}

.mobile-card-actions {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
}

.mobile-card-actions .btn {
    border-radius: 12px;
    padding: 9px 10px;
}