:root {
    --bg: #081018;
    --card: #0f1720;
    --accent: #00d4c7;
    /* türkis */
    --muted: #98a3b3;
}

* {
    box-sizing: border-box
}

html,
body {
    height: 100%
}

body {
    margin: 0;
    font-family: Inter, ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial;
    background: radial-gradient(1200px 600px at 10% 10%, rgba(0, 212, 199, 0.06), transparent),
        radial-gradient(900px 400px at 90% 90%, rgba(0, 212, 199, 0.03), transparent),
        var(--bg);
    color: #e6eef6;
}

.centered {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem;
}

.card {
    width: 100%;
    max-width: 880px;
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.02), rgba(255, 255, 255, 0.01));
    border: 1px solid rgba(255, 255, 255, 0.03);
    padding: 2.5rem;
    border-radius: 16px;
    box-shadow: 0 10px 40px rgba(2, 6, 23, 0.6);
    text-align: center;
}

.logo {
    max-width: 240px;
    display: block;
    margin: 0 auto 1rem
}

h1 {
    margin: 0 0 .25rem;
    font-size: 2rem;
    letter-spacing: 0.5px
}

.tagline {
    color: var(--accent);
    margin: 0 0 1rem
}

.desc {
    color: var(--muted);
    line-height: 1.5
}

.actions {
    margin: 1.5rem 0;
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap
}

.btn {
    display: inline-block;
    padding: .75rem 1.25rem;
    border-radius: 10px;
    text-decoration: none;
    font-weight: 600;
    border: 1px solid transparent
}

.btn.primary {
    background: linear-gradient(90deg, var(--accent), #00bfb0);
    color: #04121a
}

.btn.ghost {
    background: transparent;
    color: var(--accent);
    border: 1px solid rgba(0, 212, 199, 0.18)
}

.credit {
    margin-top: 1rem;
    color: var(--muted);
    font-size: .9rem
}

.hint {
    color: #999;
    font-size: .85rem
}

@media (max-width:520px) {
    .card {
        padding: 1.5rem;
        border-radius: 12px
    }

    h1 {
        font-size: 1.4rem
    }
}