:root {
    --sl-accent: #367fa9;
    --sl-bg: #eef1f6;
    --sl-ink: #1b2430;
    --sl-muted: #6b7684;
}
* { box-sizing: border-box; }
body {
    margin: 0;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: "Segoe UI", -apple-system, BlinkMacSystemFont, Roboto, Helvetica, Arial, sans-serif;
    background: var(--sl-bg);
    color: var(--sl-ink);
}
.sl-card {
    width: 100%;
    max-width: 360px;
    margin: 0 16px;
    background: #fff;
    border-radius: 16px;
    padding: 36px 28px;
    box-shadow: 0 10px 30px rgba(16, 24, 40, .08);
    text-align: center;
}
.sl-logo {
    max-width: 72px;
    max-height: 72px;
    margin: 0 auto 12px;
}
.sl-title {
    font-weight: 700;
    font-size: 1.2rem;
    margin: 0 0 4px;
}
.sl-sub {
    color: var(--sl-muted);
    font-size: .85rem;
    margin: 0 0 24px;
}
.sl-btn {
    display: block;
    width: 100%;
    padding: 12px 16px;
    border: none;
    border-radius: 8px;
    background: var(--sl-accent);
    color: #fff;
    font-weight: 700;
    font-size: .95rem;
    cursor: pointer;
    text-decoration: none;
    transition: transform .15s ease, box-shadow .2s ease;
}
.sl-btn:hover, .sl-btn:focus {
    color: #fff;
    box-shadow: 0 6px 16px rgba(54, 127, 169, .35);
}
.sl-btn:active { transform: scale(.97); }