:root {
    --primary-color: #40c4ff;
    --secondary-color: #2979ff;
    --success-color: #8bc34a;
    --danger-color: #c91e1e;
    --light-bg: #f8f9fa;
    --border-color: #dddddd;
}

.sf-wrapper {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: var(--light-bg);
    padding: 40px 20px;
}

.sf-container {
    max-width: 950px;
    margin: 0 auto;
    background: white;
    border-radius: 10px;
    box-shadow: 0 2px 20px rgba(0,0,0,0.1);
    padding: 40px;
}

.sf-breadcrumb-container {
    margin-bottom: 40px;
}

.sf-step-breadcrumb {
    display: flex;
    justify-content: space-between;
    list-style: none;
    padding: 0;
    margin: 0;
    position: relative;
}

.sf-step-breadcrumb li {
    flex: 1;
    text-align: center;
    position: relative;
    color: #999;
}

.sf-step-breadcrumb li::before {
    content: '';
    position: absolute;
    top: 20px;
    left: -50%;
    width: 100%;
    height: 2px;
    background: var(--border-color);
    z-index: 0;
}

.sf-step-breadcrumb li:first-child::before {
    display: none;
}

.sf-step-breadcrumb li.active {
    color: var(--primary-color);
    font-weight: bold;
}

.sf-step-breadcrumb li.completed {
    color: var(--success-color);
}

.sf-step-breadcrumb li.completed::before {
    background: var(--success-color);
}

.sf-step-number {
    display: inline-block;
    width: 40px;
    height: 40px;
    line-height: 40px;
    border-radius: 50%;
    background: #e0e0e0;
    color: white;
    margin-bottom: 10px;
    font-weight: bold;
    position: relative;
    z-index: 1;
}

.sf-step-breadcrumb li.active .sf-step-number {
    background: var(--primary-color);
}

.sf-step-breadcrumb li.completed .sf-step-number {
    background: var(--success-color);
}

.sf-step-title {
    display: block;
    font-size: 14px;
    margin-top: 10px;
}

.sf-form-step {
    display: none;
}

.sf-form-step.active {
    display: block;
    animation: sfFadeIn 0.3s ease-in;
}

@keyframes sfFadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.sf-form-label {
    font-weight: 600;
    color: #333;
    margin-bottom: 8px;
    display: block;
}

.sf-form-control, .sf-form-select {
    width: 100%;
    border: 1px solid var(--border-color);
    border-radius: 5px;
    padding: 10px 15px;
    transition: all 0.3s ease;
    font-size: 14px;
    font-family: inherit;
}

.sf-form-control:focus, .sf-form-select:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.2rem rgba(64, 196, 255, 0.25);
    outline: none;
}

.sf-radio-group, .sf-checkbox-group {
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
    margin-top: 10px;
}

.sf-radio-option, .sf-checkbox-option {
    display: flex;
    align-items: center;
    padding: 10px 15px;
    border: 2px solid var(--border-color);
    border-radius: 5px;
    cursor: pointer;
    transition: all 0.3s ease;
    min-width: 150px;
}

.sf-radio-option:hover, .sf-checkbox-option:hover {
    border-color: var(--primary-color);
    background: rgba(64, 196, 255, 0.05);
}

.sf-radio-option input[type="radio"],
.sf-checkbox-option input[type="checkbox"] {
    margin-right: 10px;
    width: 20px;
    height: 20px;
    cursor: pointer;
}

.sf-conditional-field {
    display: none;
    margin-top: 20px;
    padding: 20px;
    background: rgba(64, 196, 255, 0.05);
    border-left: 4px solid var(--primary-color);
    border-radius: 5px;
}

.sf-conditional-field.show {
    display: block;
    animation: sfSlideDown 0.3s ease-out;
}

@keyframes sfSlideDown {
    from { opacity: 0; max-height: 0; padding: 0 20px; }
    to { opacity: 1; max-height: 2000px; padding: 20px; }
}

.sf-btn {
    padding: 12px 30px;
    border: none;
    border-radius: 5px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    min-width: 150px;
    font-size: 14px;
}

.sf-btn-prev {
    background: #a0dbfe;
    color: white;
}

.sf-btn-prev:hover {
    background: #7ac5f0;
    transform: translateY(-2px);
    box-shadow: 0 4px 10px rgba(0,0,0,0.2);
}

.sf-btn-next, .sf-btn-submit {
    background: var(--primary-color);
    color: white;
}

.sf-btn-next:hover, .sf-btn-submit:hover {
    background: var(--secondary-color);
    transform: translateY(-2px);
    box-shadow: 0 4px 10px rgba(0,0,0,0.2);
}

.sf-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none !important;
}

.sf-button-group {
    display: flex;
    justify-content: space-between;
    margin-top: 40px;
    gap: 20px;
}

.sf-intro-text {
    text-align: center;
    margin-bottom: 30px;
}

.sf-intro-text h3 {
    color: var(--danger-color);
    font-size: 23px;
    margin: 10px 0;
}

.sf-required {
    color: var(--danger-color);
    margin-right: 5px;
}

.sf-sub-text {
    font-size: 12px;
    color: #666;
    font-style: italic;
    display: block;
    margin-top: 3px;
}

.sf-divider {
    border: 0;
    border-top: 2px solid var(--border-color);
    margin: 30px 0;
}

.sf-section-title {
    text-align: center;
    color: #666;
    margin: 30px 0 20px;
    font-size: 16px;
}

.sf-success-message {
    text-align: center;
    padding: 60px 20px;
}

.sf-success-icon {
    font-size: 80px;
    color: var(--secondary-color);
    margin-bottom: 20px;
}

.sf-success-message h2 {
    color: #333;
    margin-bottom: 20px;
}

.sf-error-message {
    color: var(--danger-color);
    font-size: 14px;
    margin-top: 5px;
    display: none;
}

.sf-form-control.error, .sf-form-select.error {
    border-color: var(--danger-color);
}

.sf-form-control.error + .sf-error-message {
    display: block;
}

.sf-mb-4 {
    margin-bottom: 1.5rem;
}

.sf-alert-danger {
    background: #f8d7da;
    border: 1px solid #f5c6cb;
    color: var(--danger-color);
    padding: 15px;
    border-radius: 5px;
    margin-bottom: 20px;
}

.sf-loading {
    display: none;
    text-align: center;
    padding: 20px;
}

.sf-loading.show {
    display: block;
}

.sf-spinner {
    border: 4px solid #f3f3f3;
    border-top: 4px solid var(--primary-color);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: sfSpin 1s linear infinite;
    margin: 0 auto 10px;
}

@keyframes sfSpin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

@media (max-width: 768px) {
    .sf-container {
        padding: 20px;
    }

    .sf-button-group {
        flex-direction: column;
    }

    .sf-btn {
        width: 100%;
    }

    .sf-radio-group, .sf-checkbox-group {
        flex-direction: column;
    }

    .sf-radio-option, .sf-checkbox-option {
        width: 100%;
    }

    .sf-step-breadcrumb {
        font-size: 12px;
    }

    .sf-step-number {
        width: 35px;
        height: 35px;
        line-height: 35px;
        font-size: 14px;
    }
}