.briefing-container {
    max-width: var(--max-width);
    margin: var(--space-6) auto;
    padding: var(--space-3);
}

.briefing-header {
    text-align: center;
    margin-bottom: var(--space-5);
}

.briefing-header h1 {
    font-size: var(--text-4xl);
    font-weight: var(--font-bold);
    margin-bottom: var(--space-2);
    color: var(--fg);
}

.briefing-header p {
    font-size: var(--text-lg);
    color: var(--fg-muted);
    max-width: 600px;
    margin: 0 auto;
}

.briefing-form {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
    background: var(--bg-card);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-2xl);
    padding: var(--space-4);
}

.briefing-fieldset {
    border: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.briefing-fieldset legend {
    font-size: var(--text-lg);
    font-weight: var(--font-bold);
    color: var(--fg);
    margin-bottom: var(--space-1);
    padding: 0;
}

.briefing-section-title {
    font-size: var(--text-base);
    font-weight: var(--font-bold);
    color: var(--accent);
    text-transform: uppercase;
    letter-spacing: 0.03em;
    margin: var(--space-2) 0 0;
    padding-top: var(--space-3);
    border-top: 1px solid var(--border-light);
}

.briefing-fieldset > .briefing-section-title:first-child {
    margin-top: 0;
    padding-top: 0;
    border-top: none;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: var(--space-1);
}

.form-group label {
    font-size: var(--text-sm);
    font-weight: var(--font-medium);
    color: var(--fg);
}

.form-group input,
.form-group select,
.form-group textarea {
    padding: var(--space-2) var(--space-2);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    font-size: var(--text-base);
    font-family: inherit;
    background: var(--bg);
    color: var(--fg);
    transition: all var(--transition-normal);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 2px rgba(var(--accent-rgb), 0.1);
}

.form-group input:invalid:not(:placeholder-shown),
.form-group select:invalid:not([value=""]),
.form-group textarea:invalid:not(:placeholder-shown) {
    border-color: var(--color-error, #ef4444);
}

.form-group textarea {
    min-height: 120px;
    resize: vertical;
}

.form-group select {
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23666' d='M6 9L1 4h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right var(--space-2) center;
    padding-right: var(--space-5);
}

@media (prefers-color-scheme: dark) {
    .form-group select {
        background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23aaa' d='M6 9L1 4h10z'/%3E%3C/svg%3E");
    }
}

.error-message {
    font-size: var(--text-xs);
    color: var(--color-error, #ef4444);
    display: none;
    margin-top: var(--space-half);
}

.form-group.error .error-message {
    display: block;
}

.form-group.error input,
.form-group.error select,
.form-group.error textarea {
    border-color: var(--color-error, #ef4444);
}

/* Checkbox and Radio styles */
.form-group-checkbox,
.form-group-radio {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

.checkbox-group,
.radio-group {
    display: flex;
    flex-direction: column;
    gap: var(--space-1);
}

.checkbox-item,
.radio-item {
    display: flex;
    align-items: center;
    gap: var(--space-1);
}

.checkbox-item input[type="checkbox"],
.radio-item input[type="radio"] {
    width: 18px;
    height: 18px;
    cursor: pointer;
    margin: 0;
    padding: 0;
    border: 1px solid var(--border-light);
    border-radius: var(--radius-sm);
}

.checkbox-item input[type="radio"] {
    border-radius: 50%;
}

.checkbox-item label,
.radio-item label {
    font-size: var(--text-base);
    cursor: pointer;
    margin: 0;
}

.checkbox-item input[type="checkbox"]:focus,
.radio-item input[type="radio"]:focus {
    border-color: var(--accent);
    outline: 2px solid rgba(var(--accent-rgb), 0.5);
    outline-offset: 2px;
}

/* URL list for references */
.url-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

.url-item {
    display: flex;
    gap: var(--space-1);
    align-items: center;
}

.url-item input {
    flex: 1;
}

.url-item button {
    padding: var(--space-2) var(--space-2);
    background: transparent;
    border: 1px solid var(--border-light);
    color: var(--fg-faint);
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-normal);
}

.url-item button:hover {
    color: var(--color-error, #ef4444);
    border-color: var(--color-error, #ef4444);
}

.add-url-btn {
    display: flex;
    align-items: center;
    gap: var(--space-1);
    padding: var(--space-1) var(--space-2);
    font-size: var(--text-sm);
    background: transparent;
    border: 1px solid var(--border-light);
    color: var(--fg-muted);
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-normal);
    margin-top: var(--space-1);
}

.add-url-btn:hover {
    color: var(--accent);
    border-color: var(--accent);
}

/* Form actions */
.form-actions {
    display: flex;
    gap: var(--space-2);
    margin-top: var(--space-2);
}

.form-actions .btn-primary {
    flex: 1;
    min-height: 44px;
}

.form-actions .btn-primary:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

/* Form note */
.form-note {
    font-size: var(--text-xs);
    color: var(--fg-faint);
    margin-top: var(--space-1);
}

/* Responsive */
@media (max-width: 600px) {
    .briefing-container {
        margin: var(--space-3) auto;
        padding: var(--space-2);
    }

    .briefing-header h1 {
        font-size: var(--text-3xl);
    }

    .briefing-form {
        padding: var(--space-3);
        gap: var(--space-3);
    }

    .form-actions {
        flex-direction: column;
    }

    .form-actions .btn-primary {
        width: 100%;
    }
}

/* Success state */
.form-success {
    background: var(--color-success, #10b981);
    color: white;
    padding: var(--space-2);
    border-radius: var(--radius-lg);
    margin-bottom: var(--space-2);
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.form-success i {
    font-size: var(--text-2xl);
}

.hp-field {
    position: absolute;
    left: -9999px;
    width: 1px;
    height: 1px;
    opacity: 0;
    pointer-events: none;
}

.other-input {
    margin-top: var(--space-1);
}