:root {
    --text-color: #24292e;
    --bg-color: #ffffff;
    --link-color: #0366d6;
    --border-color: #e1e4e8;
    --btn-bg: #2ea44f;
    --btn-text: #ffffff;
    --btn-hover: #2c974b;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji";
    color: var(--text-color);
    background-color: var(--bg-color);
    line-height: 1.6;
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: center;
}

.container {
    max-width: 600px;
    width: 100%;
    margin: 60px 20px;
    padding: 40px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    box-shadow: 0 1px 3px rgba(27,31,35,0.12);
    box-sizing: border-box;
}

header {
    text-align: center;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 24px;
    margin-bottom: 24px;
}

.logo {
    width: 96px;
    height: 96px;
    border-radius: 20px;
    margin-bottom: 16px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

h1 {
    margin: 0 0 8px 0;
    font-size: 32px;
    font-weight: 600;
}

header .subtitle {
    margin: 0;
    color: #586069;
    font-size: 18px;
    font-weight: 400;
}

main p {
    font-size: 16px;
    color: #24292e;
    margin-bottom: 24px;
}

main h2 {
    margin-top: 32px;
    margin-bottom: 16px;
    font-size: 24px;
    font-weight: 600;
}

main ul {
    margin-bottom: 24px;
    padding-left: 24px;
}

.text-center {
    text-align: center;
}

.actions {
    text-align: center;
    margin-bottom: 32px;
}

.button {
    display: inline-block;
    padding: 12px 24px;
    font-size: 16px;
    font-weight: 600;
    line-height: 20px;
    white-space: nowrap;
    vertical-align: middle;
    cursor: pointer;
    background-color: var(--btn-bg);
    color: var(--btn-text);
    border: 1px solid rgba(27,31,35,0.15);
    border-radius: 6px;
    text-decoration: none;
    transition: 0.2s cubic-bezier(0.3, 0, 0.5, 1);
}

.button:hover {
    background-color: var(--btn-hover);
    text-decoration: none;
}

footer {
    border-top: 1px solid var(--border-color);
    padding-top: 24px;
    text-align: center;
    font-size: 14px;
    color: #586069;
}

footer a {
    color: var(--link-color);
    text-decoration: none;
}

footer a:hover {
    text-decoration: underline;
}

footer p {
    margin: 8px 0;
}

footer .copyright {
    font-size: 12px;
    margin-top: 16px;
}

@media (max-width: 600px) {
    .container {
        margin: 20px 10px;
        padding: 24px;
    }
}