:root { color-scheme: light; font-family: 'NanumSquareNeo', 'Nanum Square Neo', 'Malgun Gothic', sans-serif; color: #1f2937; }
    * { box-sizing: border-box; }
    body { margin: 0; min-width: 280px; min-height: 100vh; background: linear-gradient(135deg, #667eea 0%, #764ba2 100%); background-attachment: fixed; }
    button, a { -webkit-tap-highlight-color: transparent; }
    a { color: inherit; text-decoration: none; }
    button { font: inherit; cursor: pointer; }
    button:focus-visible, a:focus-visible, summary:focus-visible { outline: 3px solid #526be3; outline-offset: 5px; }
    [hidden] { display: none !important; }
    .page { display: flex; min-height: 100vh; padding: 32px 20px; justify-content: center; align-items: center; }
    .card { width: 100%; max-width: 760px; padding: 30px 44px 28px; border-radius: 30px; background: rgba(255, 255, 255, .97); box-shadow: 0 20px 60px rgba(0, 0, 0, .28); }
    .topline { display: flex; align-items: center; justify-content: space-between; gap: 12px; font-size: 12px; color: #64748b; }
    .back { display: inline-flex; align-items: center; gap: 6px; padding: 4px 0; }
    .back:hover { color: #2b58f0; }
    .edition { color: #6a6e8e; letter-spacing: .12em; font-size: 10px; font-weight: 800; }
    .icon { width: 20px; height: 20px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; flex: 0 0 auto; }
    .back .icon { width: 15px; height: 15px; }
    .hero { text-align: center; padding-top: 17px; }
    .logo { display: block; width: 88px; height: 88px; margin: 0 auto 19px; border-radius: 19px; }
    h1 { margin: 0; font-size: 34px; font-weight: 800; letter-spacing: -1.4px; line-height: 1.3; }
    .subtitle { margin: 12px 0 18px; color: #64748b; font-size: 14px; line-height: 1.8; word-break: keep-all; }
    .platforms { display: flex; flex-wrap: wrap; justify-content: center; gap: 7px; }
    .pill { display: inline-flex; gap: 5px; align-items: center; padding: 7px 11px; border: 1px solid #e0e5f1; border-radius: 8px; background: #f0f3fa; color: #546580; font-size: 11px; font-weight: 700; }
    .pill.os { background: #edf8f3; border-color: #d1ecdd; color: #268655; }
    .pill .icon { width: 13px; height: 13px; }
    .install { margin-top: 29px; }
    .section-heading { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 11px; }
    h2 { margin: 0; font-size: 14px; font-weight: 800; letter-spacing: -.25px; }
    .hint { color: #8993a7; font-size: 11px; }
    .terminal { border: 1px solid #e0e5ee; border-radius: 13px; overflow: hidden; background: #f2f4f9; }
    .terminal-bar { display: flex; align-items: center; gap: 7px; padding: 10px 15px; background: #eaeef6; color: #7b879d; font-size: 10px; border-bottom: 1px solid #e0e5ee; }
    .terminal-bar .icon { width: 13px; height: 13px; }
    pre { margin: 0; padding: 16px 17px; overflow-x: auto; color: #34415a; font: 12px/1.95 ui-monospace, SFMono-Regular, Consolas, 'Liberation Mono', monospace; tab-size: 2; }
    code { font-family: inherit; }
    .primary { display: flex; align-items: center; justify-content: center; gap: 10px; width: 100%; min-height: 59px; margin-top: 14px; padding: 14px 18px; color: #fff; border: 0; border-radius: 14px; background: linear-gradient(135deg, #28a745 0%, #20c997 100%); box-shadow: 0 10px 27px rgba(40, 167, 69, .25); font-size: 18px; font-weight: 800; transition: filter .18s, transform .18s; }
    .primary:hover { filter: brightness(1.04); transform: translateY(-1px); }
    .primary:active { transform: translateY(0); }
    .primary .icon { width: 21px; height: 21px; }
    .copy-status { min-height: 20px; margin: 10px 0 0; text-align: center; font-size: 11px; line-height: 1.8; color: #738099; word-break: keep-all; }
    .copy-status.success { color: #208555; }
    .direct-download { display: flex; flex-wrap: wrap; align-items: center; justify-content: center; gap: 8px; margin: 16px 0 0; font-size: 12px; }
    .direct-download span { color: #8b95a8; }
    .direct-download a { display: inline-flex; align-items: center; gap: 5px; color: #4261be; font-weight: 800; padding: 3px 0; }
    .direct-download a:hover { text-decoration: underline; text-underline-offset: 4px; }
    .direct-download .icon { width: 15px; height: 15px; }
    .extras { margin-top: 27px; border-top: 1px solid #e6e9f0; }
    details { border-bottom: 1px solid #e6e9f0; }
    summary { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 17px 0; cursor: pointer; list-style: none; color: #536079; font-size: 12px; font-weight: 700; }
    summary::-webkit-details-marker { display: none; }
    summary .icon { width: 15px; height: 15px; transition: transform .18s; }
    details[open] summary .icon { transform: rotate(180deg); }
    .detail-body { padding: 0 0 18px; font-size: 12px; line-height: 1.8; color: #6b778d; }
    .detail-body p { margin: 0 0 11px; word-break: keep-all; }
    .detail-body pre { background: #f0f3f8; border: 1px solid #e0e5ee; border-radius: 10px; }
    .detail-body .small-copy { display: inline-flex; align-items: center; gap: 6px; margin-top: 10px; padding: 8px 12px; border: 1px solid #dce2ee; border-radius: 8px; background: #fff; color: #526485; font-size: 11px; font-weight: 700; }
    .small-copy .icon { width: 13px; height: 13px; }
    .version { display: block; padding: 8px 0 12px; font-size: 11px; overflow-wrap: anywhere; }
    .file-links { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 14px; }
    .file-links a { padding: 7px 11px; color: #4261be; background: #eff3fb; border: 1px solid #dde5f4; border-radius: 7px; font-size: 11px; font-weight: 700; }
    .file-links a:hover { background: #e4ebfb; }
    .fingerprint { padding: 10px 12px; border-radius: 8px; background: #f0f3f8; font: 11px/1.8 ui-monospace, Consolas, monospace; overflow-wrap: anywhere; color: #5d6b82; }
    .footer { margin: 18px 0 0; color: #939bad; font-size: 10px; text-align: center; line-height: 1.7; }
    .footer strong { color: #6b79a2; font-weight: 700; }
    @media (max-width: 540px) {
      .page { padding: 16px 12px; align-items: flex-start; }
      .card { padding: 24px 22px; border-radius: 24px; }
      .hero { padding-top: 22px; }
      .logo { width: 78px; height: 78px; border-radius: 17px; margin-bottom: 17px; }
      h1 { font-size: 29px; }
      .subtitle { font-size: 12px; }
      .pill { font-size: 10px; padding: 7px 8px; }
      .install { margin-top: 25px; }
      .section-heading { align-items: baseline; }
      .hint { font-size: 10px; }
      pre { white-space: pre-wrap; overflow-wrap: anywhere; font-size: 11px; padding: 13px; line-height: 1.9; }
      .primary { min-height: 56px; font-size: 16px; }
      .direct-download { font-size: 11px; }
      .extras { margin-top: 23px; }
    }
    @media (prefers-reduced-motion: reduce) { *, *::before, *::after { transition: none !important; scroll-behavior: auto !important; } }

    .os-nav { display: flex; justify-content: center; gap: 5px; margin: 21px auto 0; padding: 5px; width: fit-content; border: 1px solid #e1e6f1; border-radius: 12px; background: #edf0f7; }
    .os-nav a { padding: 9px 18px; border-radius: 8px; font-size: 12px; font-weight: 700; color: #708099; }
    .os-nav a:hover { color: #415bbb; background: #e3e9f7; }
    .os-nav a[aria-current="page"] { color: #4261be; background: #fff; box-shadow: 0 2px 7px #263c6812; }
    @media (max-width: 540px) { .os-nav a { padding: 9px 15px; font-size: 11px; } }
  
    .desktop-card { max-width: 680px; }
    .downloads { margin-top: 27px; }
    .download-choice { margin-top: 15px; }
    .download-choice .primary { margin-top: 0; }
    .secondary { display: flex; align-items: center; justify-content: center; gap: 10px; width: 100%; min-height: 55px; padding: 14px 18px; border: 1px solid #dbe3f2; border-radius: 13px; background: #f0f4fb; color: #4c65a5; font-size: 15px; font-weight: 800; }
    .secondary:hover { background: #e7eefb; }
    .download-note { margin: 9px 0 0; text-align: center; font-size: 11px; color: #8390a7; line-height: 1.8; }
    a[aria-disabled="true"] { background: #e9edf4; color: #8591a5; box-shadow: none; cursor: default; transform: none; filter: none; }
    .guide { margin: 25px 0 0; padding: 20px; border: 1px solid #e2e7f0; border-radius: 13px; background: #f4f6fa; }
    .guide h2 { margin-bottom: 13px; }
    .steps { margin: 0; padding-left: 19px; color: #6b7890; font-size: 12px; line-height: 1.85; word-break: keep-all; }
    .steps li + li { margin-top: 7px; }
    .steps strong { color: #465570; font-weight: 700; }
    .support-link { margin: 20px 0 0; text-align: center; font-size: 11px; color: #8893a6; line-height: 1.8; word-break: keep-all; }
    .support-link a { color: #4261be; font-weight: 800; text-decoration: underline; text-underline-offset: 3px; }
    @media (max-width: 540px) { .guide { padding: 17px; } .steps { font-size: 11px; } .secondary { font-size: 14px; } }