* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Montserrat', sans-serif;
    color: #fff;
}

body {
    background-color: #0f0f0f;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    padding: 1rem;
    text-align: center;
}

.container {
    text-align: center;
    padding: 2rem;
    width: 100%;
    max-width: 600px;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.title {
    font-size: 1.5rem;
    font-weight: bold;
    margin-bottom: 1.5rem;
    color: #fff;
}

.glass-card {
    width: 100%;
    padding: 1.5rem;
    border-radius: 15px;
    background: rgba(255, 255, 255, 0.05);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.year-selection {
    display: flex;
    justify-content: space-around;
    margin: 1rem 0;
}

.year {
    padding: 0.5rem 1rem;
    border-radius: 8px;
    border: none;
    cursor: pointer;
    color: #fff;
    background-color: rgba(255, 255, 255, 0.1);
    transition: background 0.3s;
    font-size: 0.9rem;
}

.year.active {
    background-color: #f7245c;
    color: #fff;
}

.year.disabled {
    background-color: rgba(255, 255, 255, 0.05);
    cursor: not-allowed;
    color: #888;
}

.branch-selection {
    margin: 1.5rem;
}

select#branchSelect {
    padding: 0.5rem;
    margin-top: 1rem;
    border-radius: 5px;
    background-color: rgba(255, 255, 255, 0.1);
    color: #fff;
    border: none;
    outline: none;
    width: 100%;
}

select#branchSelect option {
    background-color: #0f0f0f;
    color: #fff;
}

.subject-list {
    margin-top: 1rem;
    margin-bottom: 1.5rem;
}

.subject {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin: 0.5rem 0;
    flex-wrap: wrap;
}

.subject span {
    flex: 1;
    text-align: left;
    color: #fff;
}

.grade-dropdown {
    padding: 0.3rem;
    border-radius: 5px;
    background-color: rgba(255, 255, 255, 0.1);
    color: #fff;
    border: none;
    outline: none;
    width: 45%;
    margin-left: auto;
}

.grade-dropdown option {
    background-color: #0f0f0f;
    color: #fff;
}

.calculate-btn {
    width: 100%;
    padding: 0.7rem;
    border-radius: 8px;
    background-color: rgba(255, 255, 255, 0.1);
    color: #fff;
    font-size: 1rem;
    font-weight: bold;
    border: none;
    cursor: pointer;
    transition: background 0.3s;
    margin-top: 1rem;
}

.calculate-btn:hover {
    background-color: #f7245c;
}

.cgpa-result {
    margin-top: 1rem;
    font-size: 1.2rem;
    color: #fff;
}

.cgpa-result span {
    font-weight: bold;
    color: #fff;
}

.backlog-message {
    margin-top: 0.5rem;
    color: rgb(255, 69, 69);
    font-weight: bold;
}

@media (max-width: 768px) {
    .container {
        width: 90%;
        max-width: 500px;
    }

    .glass-card {
        width: 100%;
        padding: 1.5rem;
    }

    .year-selection {
        flex-direction: column;
        gap: 0.5rem;
    }

    .year {
        width: 100%;
        padding: 0.4rem;
        font-size: 1rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 1rem;
        display: flex;
        justify-content: center;
        align-items: center;
    }

    .title {
        font-size: 1.2rem;
    }

    .year-selection {
        gap: 0.5rem;
    }

    .year {
        font-size: 0.9rem;
        padding: 0.4rem 0.8rem;
    }

    .subject {
        flex-direction: column;
        align-items: flex-start;
    }

    .grade-dropdown {
        width: 100%;
        margin-top: 0.5rem;
    }

    .calculate-btn {
        font-size: 0.9rem;
        padding: 0.6rem;
    }
}