:root {
    --color-primary: #1f6f4a;
    --color-primary-dark: #155034;
    --color-bg: #f6f8f6;
    --color-text: #1a1f1c;
    --color-muted: #5b6b61;
    --color-border: #dfe6e1;
    --radius: 10px;
    --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: var(--font);
    background: var(--color-bg);
    color: var(--color-text);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
}

.center-box {
    max-width: 520px;
    width: 100%;
    padding: 48px 40px;
    background: #fff;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    text-align: center;
    box-shadow: 0 4px 24px rgba(20, 40, 30, 0.06);
}

.center-box h1 {
    color: var(--color-primary-dark);
    margin-top: 0;
    font-size: 1.6rem;
}

.center-box p {
    color: var(--color-muted);
    line-height: 1.5;
}

.center-box a {
    color: var(--color-primary);
    text-decoration: none;
    font-weight: 600;
}

.center-box a:hover {
    text-decoration: underline;
}