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

        body {
            font-family: 'Poppins', sans-serif;
            background-color: #bb3d3d;
            color: #333;
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }

        header {
            background-color: #a01729;
            padding: 16px 32px;
            box-shadow: 0 2px 8px rgba(0,0,0,0.25);
        }

        .header-content {
            display: flex;
            justify-content: center;
            align-items: center;
            gap: 20px;
        }

        .logo {
            width: 120px;
            max-width: 100%;
            height: auto;
            display: block;
        }

        header h1 {
            color: #ffffff;
            font-size: 29px;
            font-weight: 1000;
        }

        nav {
            background-color: #ffffff;
            padding: 2px;
        }

        .container {
            max-width: 1000px;
            margin: 40px auto;
            padding: 0 20px;
            flex: 1;
        }

        .content {
            flex: 1;
            background: #ffffff;
            border-radius: 12px;
            padding: 36px 40px;
        }

        .content h2 {
            font-size: 30px;
            font-weight: 700;
            color: #000000;
            margin-bottom: 8px;
        }

        .content > p {
            color: #666;
            font-size: 15px;
            margin-bottom: 40px;
            line-height: 1;
        }

        .sidebar {
            width: 250px;
            flex-shrink: 0;
            margin-top: 30px;
        }

        .form-group {
            margin-bottom: 20px;
            display: flex;
            flex-direction: column;
            gap: 6px;
        }

        .form-group label {
            font-size: 0.9rem;
            font-weight: 600;
            color: #444;
        }

        .form-group input {
            padding: 11px 14px;
            border: 1.5px solid #ddd;
            border-radius: 8px;
            font-family: 'Poppins', sans-serif;
            font-size: 15px;
            color: #333;
            outline: none;
        }

        .btn-submit {
            background-color: #a01729;
            color: #ffffff;
            border: none;
            padding: 10px 20px;
            font-family: 'Poppins', sans-serif;
            font-size: 15px;
            font-weight: 600;
            border-radius: 8px;
            margin-bottom: 39px;
            cursor: pointer;
        }

        .btn-submit:hover {
            background-color: #c0001f;
        }

        .box {
            border-radius: 10px;
            padding: 20px 24px;
            margin-bottom: 30px;
            font-size: 15px;
            line-height: 2;
        }

        .hasil-sukses {
            background-color: #f0fff4;
            border: 1.5px solid #38a169;
            color: #276749;
        }

        .hasil-error {
            background-color: #fff5f5;
            border: 1.5px solid #e53e3e;
            color: #c53030;
        }

        .nilai {
            display: inline-block;
            padding: 2px 10px;
            border-radius: 6px;
            font-weight: 700;
            font-size: 14px;
            margin-bottom: 30px;
        }

        .nilai-a { background-color: #c6f6d5; color: #22543d; }
        .nilai-b { background-color: #bee3f8; color: #2a4365; }
        .nilai-c { background-color: #fefcbf; color: #744210; }
        .nilai-d { background-color: #fed7aa; color: #7b341e; }
        .nilai-e { background-color: #fed7d7; color: #742a2a; }

        .huruf-besar {
            font-size: 18px;
            padding: 4px 14px;
        }

        /* Tabel Nilai */
        .tabelnilaimutu {
            background: #ffffff;
            border-radius: 12px;
            padding: 24px 20px;
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
            border-top: 4px solid #a01729;
            margin-top: 20px;
        }

        .tabelnilaimutu h3 {
            font-size: 1rem;
            font-weight: 700;
            color: #000000;
            margin-bottom: 12px;
            border-left: 4px solid #a01729;
            padding-left: 10px;
        }

        table {
            width: 100%;
            border-collapse: collapse;
            font-size: 14px;
            border-radius: 8px;
        }

        thead tr {
            background-color: #a01729;
            color: #ffffff;
        }

        th, td {
            padding: 10px 14px;
            text-align: left;
        }

        tbody tr:nth-child(even) {
            background-color: #f9f9f9;
        }