:root {
    --sn-bg: #0a0a0a;
    --sn-card: #1a1a1a;
    --sn-text: #fff;
    --sn-dim: #888;
    --sn-accent: #00d4ff;
    --sn-red: #ff1744;
    --sn-green: #00e676;
    --sn-yellow: #ffb300;
    --sn-glass: rgba(255, 255, 255, 0.02);
    --sn-border: rgba(255, 255, 255, 0.08);
    --sn-glow: 0 0 20px rgba(0, 212, 255, 0.3);
    --sn-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

.light {
    --sn-bg: #fff;
    --sn-card: #f8f9fa;
    --sn-text: #1a1a1a;
    --sn-dim: #666;
    --sn-accent: #0066cc;
    --sn-red: #d32f2f;
    --sn-green: #2e7d32;
    --sn-yellow: #f57f17;
    --sn-glass: rgba(255, 255, 255, 0.9);
    --sn-border: rgba(200, 200, 200, 0.3);
    --sn-glow: 0 0 15px rgba(0, 102, 204, 0.2);
    --sn-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--sn-bg);
    color: var(--sn-text);
    line-height: 1.6;
    transition: all 0.3s ease;
}

.sn-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 1rem;
}

.sn-logo {
    font-size: clamp(1.25rem, 3vw, 1.5rem);
    font-weight: 700;
    background: linear-gradient(135deg, var(--sn-accent), var(--sn-red));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.sn-main {
    margin-top: 4rem;
    padding: 2rem 0;
}

.sn-hero {
    text-align: center;
    margin-bottom: 3rem;
}

.sn-hero h1 {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 700;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, var(--sn-accent), var(--sn-red));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.sn-hero p {
    font-size: clamp(1rem, 2.5vw, 1.125rem);
    color: var(--sn-dim);
    max-width: 37.5rem;
    margin: 0 auto;
}

.sn-ai-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: var(--sn-glass);
    border: 1px solid var(--sn-border);
    border-radius: 1rem;
    padding: 0.25rem 0.75rem;
    font-size: 0.875rem;
    margin-bottom: 1rem;
}

.sn-calculator-container {
    display: grid;
    grid-template-columns: 1fr 25rem;
    gap: 2rem;
    align-items: start;
}

.sn-form-container {
    background: var(--sn-glass);
    border: 1px solid var(--sn-border);
    border-radius: 1.25rem;
    padding: 2rem;
    backdrop-filter: blur(20px);
    box-shadow: var(--sn-shadow);
}

.sn-live-estimate {
    position: sticky;
    top: 5rem;
    background: var(--sn-glass);
    border: 1px solid var(--sn-border);
    border-radius: 1.25rem;
    padding: 1.5rem;
    backdrop-filter: blur(20px);
    box-shadow: var(--sn-shadow);
    text-align: center;
}

.sn-estimate-amount {
    font-size: clamp(2rem, 4vw, 2.625rem);
    font-weight: 700;
    background: linear-gradient(135deg, var(--sn-accent), var(--sn-red));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    margin: 0.5rem 0;
    transition: all 0.3s ease;
}

.sn-confidence {
    font-size: 0.875rem;
    color: var(--sn-dim);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.sn-confidence-bar {
    width: 6.25rem;
    height: 0.375rem;
    background: var(--sn-card);
    border-radius: 0.1875rem;
    overflow: hidden;
}

.sn-confidence-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--sn-accent), var(--sn-red));
    transition: width 0.5s ease;
}

.sn-form-grid {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.sn-section-title {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--sn-text);
    position: relative;
    padding-left: 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.sn-section-title::before {
    content: "";
    position: absolute;
    left: 0;
    width: 0.25rem;
    height: 1.25rem;
    background: linear-gradient(135deg, var(--sn-accent), var(--sn-red));
    border-radius: 0.125rem;
}

.sn-form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr));
    gap: 1rem;
}

.sn-form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.sn-form-group label {
    font-weight: 500;
    color: var(--sn-text);
    font-size: 0.875rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.sn-form-container input,
.sn-form-container select,
.sn-form-container textarea {
    background: var(--sn-card);
    border: 1px solid var(--sn-border);
    border-radius: 0.75rem;
    padding: 0.75rem 1rem !important;
    color: var(--sn-text);
    font-size: 0.875rem;
    transition: all 0.3s ease;
    outline: none;
    font-family: inherit;
}

.sn-form-container input:focus,
.sn-form-container select:focus,
.sn-form-container textarea:focus {
    border-color: var(--sn-accent);
    box-shadow: 0 0 0 0.1875rem rgba(0, 212, 255, 0.1);
}

textarea {
    resize: vertical;
    min-height: 7.5rem;
}

.sn-budget-slider {
    background: var(--sn-card);
    border: 1px solid var(--sn-border);
    border-radius: 0.75rem;
    padding: 1.25rem;
    margin-bottom: 1rem;
}

.sn-budget-display {
    font-size: 1.5rem;
    font-weight: 600;
    background: linear-gradient(135deg, var(--sn-accent), var(--sn-red));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.sn-budget-range {
    display: flex;
    justify-content: space-between;
    margin-bottom: 0.625rem;
    font-size: 0.875rem;
    color: var(--sn-dim);
}

.sn-slider {
    width: 100%;
    height: 0.5rem;
    background: var(--sn-card);
    border-radius: 0.25rem;
    outline: none;
    -webkit-appearance: none;
    appearance: none;
    cursor: pointer;
}

.sn-slider::-webkit-slider-thumb {
    appearance: none;
    width: 1.25rem;
    height: 1.25rem;
    background: linear-gradient(135deg, var(--sn-accent), var(--sn-red));
    border-radius: 50%;
    cursor: pointer;
}

.sn-slider::-moz-range-thumb {
    width: 1.25rem;
    height: 1.25rem;
    background: linear-gradient(135deg, var(--sn-accent), var(--sn-red));
    border-radius: 50%;
    cursor: pointer;
    border: none;
}

.sn-checkbox-grid,
.sn-radio-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(12.5rem, 1fr));
    gap: 0.75rem;
}

.sn-checkbox-item,
.sn-radio-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    background: var(--sn-card);
    border: 1px solid var(--sn-border);
    border-radius: 0.75rem;
    padding: 0.875rem;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
}

.sn-checkbox-item:hover,
.sn-radio-item:hover {
    border-color: var(--sn-accent);
    background: rgba(0, 212, 255, 0.05);
    transform: translateY(-0.125rem);
}

.sn-checkbox-item.selected,
.sn-radio-item.selected {
    border-color: var(--sn-accent);
    background: rgba(0, 212, 255, 0.15);
    box-shadow: 0 0 0.625rem rgba(0, 212, 255, 0.3);
}

.sn-checkbox-item:focus-within,
.sn-radio-item:focus-within {
    border-color: var(--sn-accent);
    box-shadow: 0 0 0 3px rgba(0, 212, 255, 0.3);
}

.sn-checkbox-item input,
.sn-radio-item input {
    width: auto;
    margin: 0;
    accent-color: var(--sn-accent);
}

.sn-checkbox-item .sn-icon,
.sn-radio-item .sn-icon {
    width: 1.25rem;
    height: 1.25rem;
    color: var(--sn-accent);
}

.sn-checkbox-item .sn-details,
.sn-radio-item .sn-details {
    font-size: 0.75rem;
    color: var(--sn-dim);
    margin-top: 0.25rem;
}

.sn-price-tag {
    position: absolute;
    top: -0.5rem;
    right: -0.5rem;
    background: var(--sn-accent);
    color: #fff;
    font-size: 0.625rem;
    padding: 0.125rem 0.375rem;
    border-radius: 0.5rem;
    font-weight: 600;
}

.sn-budget-warning {
    position: absolute;
    bottom: -0.5rem;
    right: -0.5rem;
    background: var(--sn-red);
    color: #fff;
    font-size: 0.625rem;
    padding: 0.125rem 0.375rem;
    border-radius: 0.5rem;
    font-weight: 600;
    box-shadow: var(--sn-shadow);
}

.sn-breakdown {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.9375rem;
    margin-top: 1rem;
}

.sn-breakdown-item {
    background: var(--sn-card);
    border: 1px solid var(--sn-border);
    border-radius: 0.75rem;
    padding: 1.25rem;
    text-align: center;
}

.sn-breakdown-item h4 {
    color: var(--sn-accent);
    margin-bottom: 0.5rem;
    font-size: 0.875rem;
    text-transform: uppercase;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.375rem;
}

.sn-breakdown-item .sn-amount {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--sn-text);
}

.sn-breakdown-item .sn-percent {
    font-size: 0.75rem;
    color: var(--sn-dim);
    margin-top: 0.25rem;
}

.sn-features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(18.75rem, 1fr));
    gap: 1.25rem;
    margin-top: 1.5rem;
}

.sn-feature-category {
    background: var(--sn-card);
    border: 1px solid var(--sn-border);
    border-radius: 1rem;
    padding: 1.5rem;
}

.sn-feature-category h3 {
    color: var(--sn-accent);
    margin-bottom: 0.9375rem;
    font-size: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.sn-feature-list {
    display: grid;
    gap: 0.625rem;
}

.sn-feature-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.625rem;
    background: var(--sn-glass);
    border: 1px solid var(--sn-border);
    border-radius: 0.5rem;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
}

.sn-feature-item:hover {
    background: rgba(0, 212, 255, 0.05);
    border-color: var(--sn-accent);
}

.sn-feature-item.selected {
    background: rgba(0, 212, 255, 0.15);
    border-color: var(--sn-accent);
    box-shadow: 0 0 0.625rem rgba(0, 212, 255, 0.3);
}

.sn-feature-item:focus {
    outline: none;
    border-color: var(--sn-accent);
    box-shadow: 0 0 0 3px rgba(0, 212, 255, 0.3);
}

.sn-feature-info {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.sn-feature-price {
    color: var(--sn-green);
    font-weight: 600;
    font-size: 0.75rem;
}

.sn-timeline-visual {
    background: var(--sn-card);
    border: 1px solid var(--sn-border);
    border-radius: 0.75rem;
    padding: 1.25rem;
    margin-top: 1rem;
}

.sn-timeline-steps {
    display: flex;
    justify-content: space-between;
    position: relative;
}

.sn-timeline-step {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    position: relative;
    flex: 1;
}

.sn-timeline-step::before {
    content: "";
    position: absolute;
    top: 2.5rem;
    left: 50%;
    width: 0.125rem;
    height: 2.5rem;
    background: var(--sn-border);
    transform: translateX(-50%);
}

.sn-timeline-step:last-child::before {
    display: none;
}

.sn-timeline-step::after {
    content: "";
    position: absolute;
    top: 1.25rem;
    left: calc(50% + 1.25rem);
    width: calc(100% - 2.5rem);
    height: 0.125rem;
    background: var(--sn-border);
}

.sn-timeline-step:last-child::after {
    display: none;
}

.sn-timeline-icon {
    width: 2.5rem;
    height: 2.5rem;
    background: var(--sn-accent);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
}

.sn-timeline-text {
    font-size: 0.75rem;
    color: var(--sn-dim);
    text-align: center;
}

.sn-ai-indicator {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.75rem;
    color: var(--sn-dim);
    margin-top: 1rem;
    justify-content: center;
}

.sn-pulse {
    animation: sn-pulse 1.5s ease-in-out infinite;
}

.sn-hidden {
    display: none;
}

.sn-btn-primary {
    background: linear-gradient(135deg, var(--sn-accent), var(--sn-red));
    padding: 0.875rem 1.5rem;
    border-radius: 0.75rem;
    color: #fff;
    font-weight: 600;
    width: 100%;
    cursor: pointer;
    border: none;
    font-size: 1rem;
    transition: all 0.3s ease;
}

.sn-btn-primary:hover {
    transform: scale(1.02);
    box-shadow: var(--sn-glow);
}

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

.sn-btn-primary:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(0, 212, 255, 0.3);
}

.sn-error-message {
    color: var(--sn-red);
    font-size: 0.75rem;
    margin-top: 0.25rem;
}

.sn-success-message {
    color: var(--sn-green);
    font-size: 0.875rem;
    margin-top: 1rem;
    text-align: center;
}

.sn-footer {
    background: var(--sn-glass);
    border-top: 1px solid var(--sn-border);
    backdrop-filter: blur(20px);
    margin-top: 2rem;
}

@keyframes sn-pulse {
    0% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.7; transform: scale(1.02); }
    100% { opacity: 1; transform: scale(1); }
}

@media (max-width: 1200px) {
    .sn-calculator-container {
        grid-template-columns: 1fr;
    }
    .sn-live-estimate {
        position: relative;
        top: 0;
    }
}

@media (max-width: 768px) {
    .sn-form-row,
    .sn-checkbox-grid,
    .sn-radio-grid,
    .sn-breakdown,
    .sn-features-grid {
        grid-template-columns: 1fr;
    }

    .sn-timeline-steps {
        flex-direction: column;
        gap: 1rem;
        align-items: center;
    }

    .sn-timeline-step::before,
    .sn-timeline-step::after {
        display: none;
    }

    .sn-timeline-icon {
        margin-bottom: 0.5rem;
    }

    .sn-form-container,
    .sn-live-estimate {
        padding: 1.5rem;
    }
}

@media (max-width: 480px) {
    .sn-header {
        padding: 0.5rem 0;
    }

    .sn-main {
        margin-top: 3rem;
        padding: 1rem 0;
    }

    .sn-hero h1 {
        font-size: 1.75rem;
    }

    .sn-form-container,
    .sn-live-estimate {
        padding: 1rem;
    }

    .sn-budget-slider {
        padding: 0.75rem;
    }

    .sn-section-title {
        font-size: 1rem;
    }

    .sn-form-group label {
        font-size: 0.8rem;
    }

    .sn-estimate-amount {
        font-size: 2rem;
    }

    .sn-footer {
        padding: 0.5rem 0;
    }
}