:root {
    --bg-color: #FFFFFF;
    --text-color: #101010;
    --text-muted: #4b5563;
    --accent-color: #7c3aed;
    --font-family: 'Inter', system-ui, -apple-system, sans-serif;
    --max-width: 640px;
    --spacing-unit: 1rem;
}

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

body {
    font-family: var(--font-family);
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-unit);
}

.container {
    width: 100%;
    max-width: var(--max-width);
    background: white;
    padding: 1.5rem;
    border-radius: 12px;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
    border: 1px solid rgba(0, 0, 0, 0.03);
}

.header {
    margin-bottom: 1.5rem;
    text-align: center;
}

.logo {
    height: 48px;
    width: auto;
}

.headline {
    font-size: 1.75rem;
    font-weight: 600;
    color: var(--accent-color);
    margin-bottom: 1rem;
    letter-spacing: -0.025em;
    text-align: center;
}

.intro {
    font-size: 1rem;
    color: var(--text-muted);
    margin-bottom: 1.5rem;
    text-align: center;
    max-width: 90%;
    margin-left: auto;
    margin-right: auto;
}

.highlight {
    color: var(--text-color);
    font-weight: 500;
}

.thank-you-section {
    margin-bottom: 1.5rem;
    padding: 0;
    background-color: transparent;
    border: none;
}

.thank-you-paragraph {
    margin-bottom: 0.75rem;
    font-size: 0.95rem;
    color: var(--text-muted);
}

.thank-you-paragraph:last-child {
    margin-bottom: 0;
}

.closing {
    font-size: 0.95rem;
    color: var(--text-muted);
    margin-bottom: 1.5rem;
    text-align: center;
}

.sign-off-section {
    text-align: center;
    margin-top: 1.5rem;
}

.valediction {
    font-size: 1rem;
    font-style: italic;
    color: var(--text-muted);
    margin-bottom: 0.5rem;
}

.name {
    font-weight: 600;
    color: var(--accent-color);
    font-size: 1.125rem;
}

.title {
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-top: 0.25rem;
}

@media (min-width: 640px) {
    .container {
        padding: 2.5rem;
    }
}