:root {
    --color-ink: #0f172a;
    --color-green: #16a34a;
    --color-green-hover: #15803d;
    --color-muted: #64748b;
    --color-bg: #f8fafc;
    --color-surface: #ffffff;
    --color-border: #e2e8f0;
    
    --font-heading: 'Archivo', system-ui, sans-serif;
    --font-body: 'Inter', system-ui, sans-serif;
}

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

body {
    font-family: var(--font-body);
    background-color: var(--color-bg);
    color: var(--color-ink);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 1.5rem;
}

::selection {
    background-color: var(--color-green);
    color: #ffffff;
}

.checkout-container {
    background: var(--color-surface);
    width: 100%;
    max-width: 480px; /* Mobile first, clean constraints */
    border-radius: 24px;
    padding: 3rem 2.5rem;
    box-shadow: 0 20px 40px -15px rgba(0,0,0,0.05), 0 0 0 1px rgba(0,0,0,0.02);
}

.checkout-header {
    text-align: center;
    margin-bottom: 2.5rem;
}

.checkout-header h1 {
    font-family: var(--font-heading);
    font-weight: 900;
    font-size: 2.25rem;
    line-height: 1.1;
    letter-spacing: -0.03em;
    margin-bottom: 1.25rem;
    color: var(--color-ink);
}

.checkout-header h1 .highlight {
    color: var(--color-green);
}

.subtitle {
    font-size: 1.05rem;
    color: var(--color-muted);
    font-weight: 500;
    line-height: 1.6;
}

.call-details-header {
    text-align: left;
    margin-bottom: 1rem;
}

.call-details-header h3 {
    font-size: 1.125rem;
    color: var(--color-ink);
    font-weight: 700;
}

.offer-section {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-bottom: 2rem;
}

.offer-card {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    padding: 1.25rem;
    text-align: left;
}

.offer-card h4 {
    font-size: 1rem;
    color: var(--color-ink);
    margin-bottom: 0.5rem;
    font-weight: 500;
}

.offer-card h4 strong {
    font-weight: 700;
    color: var(--color-green);
}

.offer-card p {
    font-size: 0.9rem;
    color: var(--color-muted);
    line-height: 1.5;
}

.offer-card p strong {
    color: var(--color-ink);
    font-weight: 600;
}

.guarantee-section {
    margin-bottom: 2rem;
}

.form-wrapper {
    margin-top: 1rem;
    width: 100%;
}

.features {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    margin-bottom: 2.75rem;
}

.feature-item {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
}

.feature-item .icon {
    flex-shrink: 0;
    width: 24px;
    height: 24px;
    color: var(--color-green);
    margin-top: 0.125rem;
}

.feature-item p {
    font-size: 0.95rem;
    color: var(--color-muted);
    line-height: 1.6;
}

.feature-item strong {
    color: var(--color-ink);
    font-weight: 600;
}

.cta-button {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    width: 100%;
    background-color: var(--color-green);
    color: white;
    text-decoration: none;
    padding: 1.25rem;
    border-radius: 12px;
    font-size: 1.125rem;
    font-weight: 700;
    font-family: var(--font-heading);
    letter-spacing: 0.02em;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 4px 12px rgba(22, 163, 74, 0.2);
}

.cta-button:hover {
    background-color: var(--color-green-hover);
    transform: translateY(-2px);
    box-shadow: 0 8px 16px rgba(22, 163, 74, 0.3);
}

.cta-button:active {
    transform: translateY(0);
}

.cta-button .arrow {
    width: 20px;
    height: 20px;
    transition: transform 0.2s ease;
}

.cta-button:hover .arrow {
    transform: translateX(4px);
}

@media (max-width: 480px) {
    body {
        padding: 1rem;
    }
    
    .checkout-container {
        padding: 2.25rem 1.5rem;
        border-radius: 20px;
    }
    
    .checkout-header {
        margin-bottom: 2rem;
    }
    
    .checkout-header h1 {
        font-size: 2rem;
    }
    

}