:root {
    --dark-bg: #010114;
    --card-bg: rgba(0, 0, 10, 0.3);
    --input-bg: rgba(255, 255, 255, 0.02);
    --text-color: #e0e0e0;
    --primary-color: #205494;
    --accent-color: #e11e3f;
    --border-color: rgba(255, 255, 255, 0.1);
    --border-focus: rgba(255, 255, 255, 0.3);
}

html, body {
    margin: 0;
    padding: 0;
    font-family: 'Poppins', sans-serif;
    background-color: var(--dark-bg);
    color: var(--text-color);
    /*background-image: url("https://www.transparenttextures.com/patterns/cartographer.png");*/
    background-size: auto;
    background-attachment: fixed;
    min-height: 100vh;
    width: 100%;
    overflow-x: hidden;
    display: flex;
    justify-content: center;
    align-items: center;
    box-sizing: border-box;
    flex-direction: column;
    background-position: center center;
    background-repeat: repeat;
    -webkit-background-size: auto; /* For Safari compatibility */
}

.nav-btn {
  background: #205494;
  color: #e0e0e0;
  padding: 12px 25px;
  border-radius: 8px;
  border: 1px solid rgba(255, 255, 255, 0.1);
  font-size: 0.90rem;
  cursor: pointer;
}
/* Container wrapping header + form */
.container {
    background-color: var(--card-bg);
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
    width: 95%;
    max-width: 800px;
    padding: 30px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 25px;
    border: 1px solid var(--border-color);
    backdrop-filter: blur(1px);
    box-sizing: border-box;
    margin: 40px auto;
}

h1 {
    background: linear-gradient(135deg, #0e1850, #e9e8e0ea);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-size: clamp(1.8rem, 5vw, 2.8rem);
    margin: 0;
    padding: 10px;
    text-align: center;
    font-weight: 700;
    letter-spacing: -0.02em;
    opacity: 0;
    animation: fadeIn 0.5s ease-out 0.3s forwards, 
               textGlow 2s ease-in-out infinite alternate;
        }
        @keyframes fadeIn {
    to { opacity: 1; }
}

        
/* Option group for radio buttons */
.option-group {
    display: flex;
    gap: 10px;
    justify-content: center;
    margin-bottom: 20px;
    flex-wrap: wrap;
    font-family: 'Poppins', sans-serif;
}
.option-group input[type="radio"] {
    display: none;
}
.option-label {
    padding: 10px 20px;
    border: 2px solid var(--primary-color);
    color: var(--text-color);
    background-color: var(--input-bg);
    cursor: pointer;
    border-radius: 8px;
    transition: background-color 0.3s, color 0.3s, border-color 0.3s;
    font-weight: 600;
}
.option-group input[type="radio"]:checked + .option-label {
    background-color: var(--accent-color);
    color: white;
    border-color: var(--accent-color);
}
.option-label:hover {
    background-color: rgba(255, 255, 255, 0.15);
    border-color: var(--accent-color);
}

/* General buttons */
button {
    background-color: var(--primary-color);
    color: var(--text-color);
    border: none;
    padding: 12px 25px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 1em;
    margin: 15px auto;
    display: block;
    transition: background-color 0.3s ease, border-color 0.3s ease;
    border: 1px solid var(--border-color);
}

button:hover {
    background-color: #1a4f8f;
    border-color: var(--border-focus);
}

#generateBtn {
    background-color: var(--accent-color);
    color: #fff;
    padding: 15px 30px;
    font-size: 1.2em;
    font-weight: 600;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    margin: 20px auto 0;
    transition: background-color 0.3s ease, transform 0.2s ease;
    grid-column: 1 / -1;
}

#generateBtn:hover {
    background-color: #bf1837;
    transform: translateY(-2px);
}

form {
    background-color: transparent;
    padding: 0;
    border-radius: 0;
    box-shadow: none;
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: 20px;
    margin-top: 20px;
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

form label {
    font-size: 1.1em;
    font-weight: 600;
    margin-bottom: 0;
    color: var(--text-color);
    display: flex;
    align-items: center;
}

form input[type="text"],
form input[type="date"],
form select {
    width: 100%;
    padding: 12px 15px;
    background-color: var(--input-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 1em;
    color: var(--text-color);
    outline: none;
    transition: border-color 0.3s ease, background-color 0.3s ease;
    box-sizing: border-box;
}

form input[type="text"]:focus,
form input[type="date"]:focus,
form select:focus {
    border-color: var(--border-focus);
    background-color: rgba(255, 255, 255, 0.12);
    box-shadow: 0 0 0 3px rgba(233, 69, 96, 0.3);
}

form input[type="date"]::-webkit-calendar-picker-indicator {
    filter: invert(1);
}

form select {
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='%23e0e0e0'%3E%3Cpath d='M7 10l5 5 5-5z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 15px center;
    background-size: 20px;
    padding-right: 40px;
}

form select option {
    background-color: var(--dark-bg);
    color: var(--text-color);
}

#customSubjectCodeContainer,
#customSubjectNameContainer {
    display: none;
}

.cont {
    height: 10vh;
    color: transparent;
}

footer {
    text-align: center;
    padding: 15px 0;
    background-color: #205494;
    color: var(--text-color);
    font-size: 14px;
    width: 100%;
    border-radius: 3px;  
}

footer a {
    color: var(--text-color);
    text-decoration: none;
    font-weight: bold;
}

footer a:hover {
    color: #ffffff;
}

footer .highlight {
    color: #ffffff;
    font-size: 1em;
}

@media (max-width: 768px) {
    body {
        padding: 10px;
        align-items: center;
    }

    .container {
        padding: 20px;
        gap: 15px;
    }

    h1 {
        font-size: 2em;
    }

    form {
        grid-template-columns: 1fr;
        gap: 15px;
    }

    button {
        font-size: 0.9em;
        padding: 10px 20px;
    }

    #generateBtn {
        font-size: 1.1em;
        padding: 12px 20px;
    }

    form label {
        font-size: 1em;
    }

    form input[type="text"],
    form input[type="date"],
    form select {
        padding: 10px 12px;
        font-size: 0.9em;
    }
}

#pdfCounterDisplay {
    margin-top: 10px;
    font-size: 1em;
    font-weight: 600;
    color: var(--text-color);
}

.brand-logo {
    width: 80px;
    height: auto;
    margin-bottom: 15px;
    object-fit: contain;
    filter: drop-shadow(0 0 8px rgba(255, 255, 255, 0.1));
    transition: transform 0.3s ease;
    animation: textGlow 2s ease-in-out infinite alternate
}

@keyframes textGlow {
            from {
                filter: drop-shadow(0 0 20px rgba(255, 255, 255, 0.4));
            }
            to {
                filter: drop-shadow(0 0 5px rgba(8, 10, 73, 0.482));
            }
        } 

@media (max-width: 768px) {
    .brand-logo {
        width: 60px;
    }
}

@media (max-width: 480px) {
    .brand-logo {
        width: 50px;
    }
}

.brand-logo:hover {
    transform: scale(1.05);
}