:root {
    color-scheme: dark;
    --bg: #07111f;
    --surface: rgba(14, 28, 47, .76);
    --surface-hover: rgba(20, 39, 64, .96);
    --line: rgba(255, 255, 255, .11);
    --text: #f7fbff;
    --muted: #96a8bd;
    --blue: #5ca9ff;
    --violet: #aa8cff;
    --cyan: #41d8d0;
    --orange: #ffad66;
}

* {
    box-sizing: border-box;
}

html {
    min-width: 320px;
    background: var(--bg);
}

body {
    display: flex;
    min-height: 100vh;
    min-height: 100svh;
    margin: 0;
    padding: 72px 20px 40px;
    align-items: center;
    justify-content: center;
    color: var(--text);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI",
        "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    background:
        radial-gradient(circle at 8% 15%, rgba(62, 126, 255, .17), transparent 28rem),
        radial-gradient(circle at 92% 82%, rgba(104, 75, 255, .14), transparent 30rem),
        linear-gradient(145deg, #07111f 0%, #091727 55%, #08111d 100%);
}

body::before {
    position: fixed;
    inset: 0;
    z-index: -1;
    background-image:
        linear-gradient(rgba(255, 255, 255, .025) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, .025) 1px, transparent 1px);
    background-size: 48px 48px;
    content: "";
    -webkit-mask-image: linear-gradient(to bottom, black, transparent 80%);
    mask-image: linear-gradient(to bottom, black, transparent 80%);
}

.back {
    position: fixed;
    top: 28px;
    left: max(20px, calc((100vw - 1120px) / 2));
    display: inline-flex;
    gap: 8px;
    align-items: center;
    color: var(--muted);
    font-size: 14px;
    text-decoration: none;
    transition: color .2s ease, transform .2s ease;
}

.back:hover {
    color: var(--text);
    transform: translateX(-3px);
}

.container {
    position: relative;
    width: min(100%, 520px);
    overflow: hidden;
    padding: 38px;
    border: 1px solid var(--line);
    border-radius: 24px;
    background: var(--surface);
    box-shadow:
        inset 0 1px 0 rgba(255, 255, 255, .055),
        0 30px 70px rgba(0, 0, 0, .28);
    -webkit-backdrop-filter: blur(18px);
    backdrop-filter: blur(18px);
}

.container::after {
    position: absolute;
    right: -70px;
    bottom: -90px;
    width: 210px;
    height: 210px;
    border-radius: 50%;
    background: var(--violet);
    content: "";
    filter: blur(72px);
    opacity: .12;
    pointer-events: none;
}

.title {
    position: relative;
    margin-bottom: 28px;
    color: var(--text);
    font-size: clamp(25px, 5vw, 32px);
    font-weight: 720;
    letter-spacing: -.035em;
    text-align: left;
}

.title::before {
    display: block;
    margin-bottom: 12px;
    color: var(--blue);
    content: "DOWNLOAD CENTER";
    font-size: 11px;
    font-weight: 750;
    letter-spacing: .18em;
}

.btn {
    --accent: var(--blue);
    position: relative;
    display: flex;
    min-height: 60px;
    margin: 12px 0;
    padding: 16px 52px 16px 18px;
    border: 1px solid var(--line);
    border-radius: 14px;
    align-items: center;
    color: var(--text);
    font-size: 16px;
    font-weight: 620;
    text-align: left;
    text-decoration: none;
    background: rgba(255, 255, 255, .035);
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, .025);
    transition: border-color .22s ease, background .22s ease, transform .22s ease;
}

.btn::after {
    position: absolute;
    right: 18px;
    display: grid;
    width: 28px;
    height: 28px;
    border: 1px solid var(--line);
    border-radius: 50%;
    place-items: center;
    color: var(--accent);
    content: "↓";
    font-size: 15px;
}

.btn:hover {
    border-color: var(--accent);
    background: var(--surface-hover);
    transform: translateY(-2px);
}

.btn:focus-visible,
.back:focus-visible {
    outline: 3px solid #8fc5ff;
    outline-offset: 4px;
}

.win { --accent: var(--blue); }
.and { --accent: var(--cyan); }
.mac { --accent: var(--violet); }
.intel { --accent: var(--orange); }

.sub {
    color: var(--muted);
    font-size: 13px;
}

footer {
    position: relative;
    margin-top: 24px;
    color: #6f8297;
    font-size: 12px;
    text-align: center;
}

@media (max-width: 600px) {
    body {
        padding: 70px 14px 28px;
        align-items: flex-start;
    }

    .back {
        top: 24px;
        left: 18px;
    }

    .container {
        padding: 26px 18px;
        border-radius: 20px;
    }

    .title {
        margin-bottom: 22px;
    }
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        transition-duration: .01ms !important;
    }
}