:root {
    color-scheme: dark;
    --bg: #050914;
    --bg-2: #070f24;
    --surface: rgba(255, 255, 255, 0.06);
    --surface-2: rgba(255, 255, 255, 0.085);
    --border: rgba(100, 140, 255, 0.25);
    --border-2: rgba(80, 120, 255, 0.4);
    --text: rgba(255, 255, 255, 0.92);
    --muted: rgba(255, 255, 255, 0.68);
    --muted-2: rgba(255, 255, 255, 0.55);
    --blue: #2f7cff;
    --blue-2: #1d4ed8;
    --shadow: rgba(47, 124, 255, 0.18);
    --shadow-2: rgba(10, 20, 60, 0.55);
    --radius: 18px;
}

* {
    box-sizing: border-box;
}

html,
body {
    height: 100%;
}

body {
    margin: 0;
    font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, Cantarell, Noto Sans, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
    background:
        radial-gradient(900px 600px at 20% 10%, rgba(47, 124, 255, 0.16), transparent 55%),
        radial-gradient(900px 600px at 80% 35%, rgba(29, 78, 216, 0.12), transparent 55%),
        radial-gradient(1200px 800px at 50% 100%, rgba(0, 0, 0, 0.55), transparent 60%),
        linear-gradient(180deg, var(--bg), var(--bg-2));
    color: var(--text);
    overflow-x: hidden;
}

.grid {
    position: fixed;
    inset: 0;
    pointer-events: none;
    background-image:
        linear-gradient(rgba(120, 160, 255, 0.06) 1px, transparent 1px),
        linear-gradient(90deg, rgba(120, 160, 255, 0.06) 1px, transparent 1px);
    background-size: 48px 48px;
    mask-image: radial-gradient(circle at 50% 20%, rgba(0, 0, 0, 0.95), transparent 70%);
    opacity: 0.35;
}

.wrap {
    min-height: 100%;
    display: grid;
    place-items: center;
    padding: 42px 18px;
}

.container {
    width: min(1000px, 100%);
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 18px;
}

@media (max-width: 900px) {
    .container {
        grid-template-columns: 1fr;
    }
}

.card {
    border-radius: var(--radius);
    background: linear-gradient(180deg, var(--surface), rgba(255, 255, 255, 0.04));
    border: 1px solid var(--border);
    box-shadow: 0 18px 55px var(--shadow-2);
    overflow: hidden;
}

.card-inner {
    padding: 22px 22px 20px;
}

.brand {
    display: flex;
    gap: 14px;
    align-items: center;
}

.logo {
    width: 56px;
    height: 56px;
    border-radius: 14px;
    background: rgba(47, 124, 255, 0.12);
    border: 1px solid rgba(47, 124, 255, 0.32);
    box-shadow: 0 0 0 6px rgba(47, 124, 255, 0.08), 0 18px 40px rgba(0, 0, 0, 0.35);
    display: grid;
    place-items: center;
    overflow: hidden;
    flex: 0 0 auto;
}

.logo img {
    width: 44px;
    height: 44px;
    object-fit: contain;
    filter: drop-shadow(0 10px 20px rgba(0, 0, 0, 0.35));
}

h1 {
    margin: 0;
    font-size: 1.8rem;
    letter-spacing: 0.2px;
    line-height: 1.1;
}

.subtitle {
    margin: 6px 0 0;
    color: var(--muted);
    font-size: 0.98rem;
}

.pill-row {
    margin-top: 14px;
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.pill {
    display: inline-flex;
    align-items: center;
    padding: 8px 11px;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.78);
    font-size: 0.9rem;
    letter-spacing: 0.15px;
}

.hero {
    position: relative;
}

.glow {
    position: absolute;
    inset: -60px -80px auto auto;
    width: 320px;
    height: 320px;
    background: radial-gradient(circle, rgba(47, 124, 255, 0.28), transparent 65%);
    filter: blur(10px);
    pointer-events: none;
}

.divider {
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(140, 170, 255, 0.35), transparent);
    margin: 18px 0;
}

.lead {
    margin: 0;
    color: var(--muted);
    line-height: 1.6;
}

.section-title {
    margin: 0 0 10px;
    font-size: 1.05rem;
    letter-spacing: 0.2px;
    color: rgba(255, 255, 255, 0.9);
}

.feature-list {
    margin: 14px 0 0;
    padding: 0;
    list-style: none;
    display: grid;
    gap: 10px;
}

.feature-list li {
    background: rgba(255, 255, 255, 0.045);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-left: 3px solid rgba(47, 124, 255, 0.55);
    border-radius: 14px;
    padding: 12px 12px;
    color: var(--muted);
    line-height: 1.5;
}

.feature-list strong {
    color: rgba(255, 255, 255, 0.9);
}

.cta {
    display: flex;
    gap: 12px;
    align-items: center;
    justify-content: space-between;
    margin-top: 18px;
    flex-wrap: wrap;
}

.btn {
    appearance: none;
    border: 0;
    background: linear-gradient(180deg, rgba(47, 124, 255, 1), rgba(29, 78, 216, 1));
    color: white;
    padding: 12px 16px;
    border-radius: 12px;
    font-weight: 700;
    letter-spacing: 0.2px;
    cursor: pointer;
    box-shadow: 0 16px 45px var(--shadow);
    transition: transform 140ms ease, box-shadow 140ms ease, filter 140ms ease;
    min-width: 220px;
}

.btn:hover {
    transform: translateY(-1px);
    filter: brightness(1.02);
    box-shadow: 0 20px 55px rgba(47, 124, 255, 0.22);
}

.btn:active {
    transform: translateY(0px);
}

.btn:disabled {
    opacity: 0.55;
    cursor: not-allowed;
    filter: none;
    box-shadow: 0 16px 45px rgba(0, 0, 0, 0.18);
    transform: none;
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid rgba(255, 255, 255, 0.12);
    color: rgba(255, 255, 255, 0.88);
    box-shadow: 0 16px 45px rgba(0, 0, 0, 0.25);
    min-width: unset;
}

.btn-secondary:hover {
    box-shadow: 0 22px 55px rgba(0, 0, 0, 0.35);
}

.panel-title {
    margin: 0;
    font-size: 1.15rem;
    letter-spacing: 0.2px;
}

.panel-sub {
    margin: 8px 0 0;
    color: var(--muted);
    font-size: 0.95rem;
    line-height: 1.45;
}

.versions-list {
    margin-top: 18px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.version-card {
    width: 100%;
    text-align: left;
    border-radius: 16px;
    background: rgba(255, 255, 255, 0.045);
    border: 1px solid rgba(255, 255, 255, 0.09);
    padding: 14px 14px;
    cursor: pointer;
    color: var(--text);
    transition: transform 140ms ease, box-shadow 140ms ease, border-color 140ms ease, background 140ms ease;
}

.version-card:hover {
    transform: translateY(-1px);
    border-color: rgba(140, 170, 255, 0.25);
    box-shadow: 0 16px 40px rgba(0, 0, 0, 0.32);
}

.version-card:active {
    transform: translateY(0px);
}

.version-card.selected {
    background: rgba(47, 124, 255, 0.08);
    border-color: rgba(47, 124, 255, 0.55);
    box-shadow: 0 0 0 4px rgba(47, 124, 255, 0.16), 0 20px 55px rgba(10, 20, 60, 0.55);
}

.version-card:disabled {
    opacity: 0.55;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.version-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 10px;
}

.badge {
    padding: 6px 10px;
    border-radius: 999px;
    font-size: 0.82rem;
    font-weight: 700;
    letter-spacing: 0.2px;
    background: rgba(47, 124, 255, 0.16);
    border: 1px solid rgba(47, 124, 255, 0.36);
    color: rgba(230, 240, 255, 0.95);
}

.version-name {
    font-weight: 800;
    letter-spacing: 0.2px;
    color: rgba(255, 255, 255, 0.92);
    font-size: 1rem;
}

.version-short {
    margin: 6px 0 0;
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.92rem;
}

.version-desc {
    margin: 0;
    color: var(--muted);
    line-height: 1.45;
    font-size: 0.95rem;
}

.hint {
    margin: 0;
    color: var(--muted-2);
    font-size: 0.9rem;
    line-height: 1.45;
}

footer {
    margin-top: 14px;
    text-align: center;
    color: rgba(255, 255, 255, 0.45);
    font-size: 0.9rem;
}

a {
    color: rgba(170, 200, 255, 0.95);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

@media (max-width: 520px) {
    .wrap {
        padding: 26px 12px;
    }

    .container {
        gap: 14px;
    }

    .card-inner {
        padding: 18px 16px 16px;
    }

    .logo {
        width: 50px;
        height: 50px;
        border-radius: 14px;
    }

    .logo img {
        width: 38px;
        height: 38px;
    }

    .btn {
        width: 100%;
        min-width: unset;
    }

    .cta {
        justify-content: stretch;
    }

    .pill-row {
        margin-top: 12px;
        gap: 8px;
    }

    .pill {
        font-size: 0.85rem;
        padding: 7px 10px;
    }

    .divider {
        margin: 14px 0;
    }

    .lead {
        font-size: 0.95rem;
    }

    h1 {
        font-size: 1.45rem;
    }

    .subtitle {
        font-size: 0.92rem;
    }

    .glow {
        display: none;
    }

    .version-card {
        padding: 12px 12px;
    }
}