/* 휴대폰·태블릿 전용 반응형 보강 */
@media (max-width: 850px) {
  html, body { width: 100%; max-width: 100%; overflow-x: hidden; }
  body { background-attachment: scroll; }
  .site-header {
    top: 6px;
    width: calc(100% - 16px);
    margin: 8px auto 0;
    padding: 8px 12px max(8px, env(safe-area-inset-bottom));
    gap: 8px;
    border-radius: 16px;
  }
  .brand { min-width: 0; }
  .brand img { width: 78px; height: 48px; }
  .menu-toggle {
    display: grid;
    place-items: center;
    width: 44px;
    height: 44px;
    border: 1px solid var(--line);
    border-radius: 12px;
    background: rgba(255,255,255,.05);
    flex: 0 0 44px;
    margin-left: auto;
  }
  nav { order: 3; gap: 4px; padding: 6px 0 2px; }
  nav a { display: flex; align-items: center; justify-content: center; min-height: 44px; height: auto; }
  .account-nav {
    order: 4;
    display: grid;
    grid-template-columns: repeat(2, minmax(0,1fr));
    width: 100%;
    min-width: 0;
    flex: 0 0 100%;
    gap: 7px;
    white-space: normal;
  }
  .account-nav > * { min-width: 0; }
  .account-nav .ghost-btn { display: flex; min-height: 44px; padding: 9px 12px; }
  .account-nav .primary-btn { min-height: 44px; }
  .account-nav .launch-art-button {
    grid-column: 1 / -1;
    width: 100%;
    height: 58px;
    background-position: center, right center;
  }
  main { width: calc(100% - 20px); margin: 20px auto 44px; }
  .hero { width: 100%; max-width: 100%; min-height: 0; gap: 24px; padding: 32px 24px; border-radius: 21px; }
  .hero > * { min-width: 0; }
  .hero h1 { max-width: 100%; font-size: clamp(28px, 7.6vw, 38px); overflow-wrap: anywhere; }
  .hero p { font-size: 15px; }
  .status-card { min-width: 0; padding: 19px; }
  .status-row { min-width: 0; gap: 12px; }
  .status-row strong { flex: 0 0 auto; white-space: nowrap; }
  .content-card, .form-card, .card { padding: 21px; border-radius: 16px; }
  .page-title { padding: 17px 3px 14px; }
  .page-title h1, .section-head h2 { font-size: 24px; }
  .section-head { align-items: flex-start; gap: 12px; }
  .notice { grid-template-columns: 64px minmax(0,1fr); gap: 12px; padding: 15px 13px; }
  .notice strong, .notice p { overflow-wrap: anywhere; }
  .download-main { padding: 25px 21px; }
  .download-main h2 { font-size: 25px; }
  .requirements { padding: 22px 19px; }
  .requirements dl { grid-template-columns: 86px minmax(0,1fr); }
  .installer-download-button { width: 100%; min-height: 70px; padding: 12px 16px; }
  .install-path-warning { padding: 14px 15px; overflow-wrap: anywhere; }
  .install-path-warning code { word-break: break-all; }
  input, textarea, select, button { font-size: 16px !important; }
  footer { width: calc(100% - 24px); padding-bottom: max(22px, env(safe-area-inset-bottom)); }
}

@media (max-width: 520px) {
  .hero { padding: 26px 18px; }
  .hero-actions { gap: 9px; }
  .hero-actions a { width: 100%; min-height: 46px; }
  .content-card, .form-card, .card { padding: 18px; }
  .form-card { width: 100%; }
  .quick-links { grid-template-columns: 1fr; }
  .step { gap: 12px; padding: 16px 14px; }
  .section-head { flex-direction: column; }
  .section-head > a { width: 100%; min-height: 44px; }
  .notice { align-items: start; }
  .notice .badge { margin-top: 1px; }
  footer, footer div { flex-direction: column; gap: 7px; }
}