.div-box {
    max-width: 800px;
    margin: 32px auto;
    padding: 40px;
    background: var(--bg-secondary, #1a1a1a);
    border-radius: 12px;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.3);
    border: 1px solid var(--border-color, #333);
}

.div-box h2 {
    font-size: 32px;
    margin-bottom: 16px;
    color: var(--text-primary, #fff);
    text-align: center;
}

.subtitle {
    color: var(--text-secondary, #b0b0b0);
    font-size: 15.2px;
    line-height: 1.6;
    margin-bottom: 16px;
    text-align: center;
}

.subtitle.small {
    font-size: 13.6px;
    color: var(--text-muted, #888);
    margin-top: -8px;
    margin-bottom: 24px;
    font-style: italic;
}

.section-title {
    font-size: 20.8px;
    color: var(--accent-color, #4a9eff);
    margin: 32px 0 24px 0;
    padding-bottom: 8px;
    border-bottom: 2px solid var(--border-color, #333);
    position: relative;
}

.section-title:first-of-type {
    margin-top: 8px;
}

.form {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
}

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

.input label {
    font-size: 14.4px;
    font-weight: 500;
    color: var(--text-primary, #fff);
    letter-spacing: 0.3px;
}

.input input,
.input select {
    padding: 12px 16px;
    background: var(--bg-tertiary, #252525);
    border: 1px solid var(--border-color, #404040);
    border-radius: 8px;
    color: var(--text-primary, #fff);
    font-size: 16px;
    transition: all 0.2s ease;
    width: 100%;
    box-sizing: border-box;
}

.input input:focus,
.input select:focus {
    outline: none;
    border-color: var(--accent-color, #4a9eff);
    box-shadow: 0 0 0 3px rgba(74, 158, 255, 0.1);
    background: var(--bg-secondary, #1a1a1a);
}

.input input::placeholder {
    color: var(--text-muted, #666);
    font-size: 14.4px;
}

.input input[type="url"] {
    font-family: monospace;
    font-size: 15.2px;
}

/* Select dropdown styling */
.input select {
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%23b0b0b0' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'><polyline points='6 9 12 15 18 9'/></svg>");
    background-repeat: no-repeat;
    background-position: right 16px center;
    background-size: 16px;
    padding-right: 40px;
}

.input select option {
    background: var(--bg-tertiary, #252525);
    color: var(--text-primary, #fff);
    padding: 8px;
}

/* Checkbox Group Styling */
.checkbox-group {
    display: flex;
    flex-direction: column;
    gap: 20px;
    padding: 8px 0;
}

.checkbox-container {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    cursor: pointer;
    padding: 4px 0;
}

.checkbox-container input[type="checkbox"] {
    width: 18px;
    height: 18px;
    margin-top: 2px;
    cursor: pointer;
    accent-color: var(--accent-color, #4a9eff);
    flex-shrink: 0;
}

.checkbox-container label {
    color: var(--text-secondary, #b0b0b0);
    font-size: 15.2px;
    line-height: 1.5;
    cursor: pointer;
    user-select: none;
}

.checkbox-container label:hover {
    color: var(--text-primary, #fff);
}

.checkbox-container input[type="checkbox"]:checked + label {
    color: var(--text-primary, #fff);
}

.checkbox-container input[type="checkbox"]:required + label::after {
    content: " *";
    color: var(--error-color, #ff4a4a);
    font-weight: bold;
}

/* Form Submit Button */
.form-submit {
    margin-top: 32px;
    padding: 16px 32px;
    background: var(--accent-color, #4a9eff);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 17.6px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    text-transform: uppercase;
    letter-spacing: 1px;
    width: 100%;
}

.form-submit:hover {
    background: var(--accent-hover, #357abd);
    transform: translateY(-2px);
    box-shadow: 0 5px 20px rgba(74, 158, 255, 0.3);
}

.form-submit:active {
    transform: translateY(0);
}

.response-message {
    padding: 16px;
    border-radius: 8px;
    margin: 16px 0;
    display: flex;
}

.response-message.success {
    display: block;
    background: rgba(40, 167, 69, 0.1);
    border: 1px solid #28a745;
    color: #28a745;
}

.response-message.error {
    display: block;
    background: rgba(220, 53, 69, 0.1);
    border: 1px solid #dc3545;
    color: #dc3545;
}

.response-message.info {
    display: block;
    background: rgba(74, 158, 255, 0.1);
    border: 1px solid #4a9eff;
    color: #4a9eff;
}

.input input:invalid,
.input select:invalid {
    border-color: var(--error-color, #ff4a4a);
}

.input input:invalid:focus,
.input select:invalid:focus {
    box-shadow: 0 0 0 3px rgba(255, 74, 74, 0.1);
}

.form-submit.loading {
    position: relative;
    color: transparent;
    pointer-events: none;
}

.form-submit.loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 20px;
    height: 20px;
    margin: -10px 0 0 -10px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: button-loading 0.8s linear infinite;
}

.input-hint {
    font-size: 12.8px;
    color: var(--text-muted, #666);
    margin-top: 4px;
}