/* --- Mobile portrait --- */
@media (max-width: 700px) {
  .header {
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 8px;
  }

  .header .brand {
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: center;
    gap: 10px;
    flex-wrap: nowrap;
    text-align: left;
  }

  .header .top-buttons {
    order: 2;
    width: 100%;
    display: flex;
    gap: 8px;
    justify-content: center;
    flex-wrap: nowrap;
  }

  .header .top-buttons .open {
    flex: 1 1 auto;
    width: auto;
  }

  /* Keep acronym at main size on mobile */
  .header .acronym {
    font-size: var(--text-xl); /* 24px */
  }

  /* Keep subtitle consistent with desktop: 18px bold */
  .header .expansion {
    font-size: var(--text-lg); /* 18px */
  }

  .layout {
    flex-direction: column;
  }

  .side {
    width: 100%;
    box-sizing: border-box;
    height: auto;
    min-height: auto;
    overflow: auto;
  }
}

/* --- Mobile landscape (wide) --- */
@media (max-width: 900px) and (min-aspect-ratio: 1/1) {
  .layout {
    display: flex;
    flex-direction: row;
    align-items: stretch;
    gap: 16px;
    flex-wrap: nowrap;
    min-width: 0;
  }

  .header {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }

  .header .top-buttons {
    order: 0;
    width: auto;
    display: flex;
    gap: 8px;
    justify-content: flex-end;
    flex-wrap: nowrap;
  }

  .header .top-buttons .open {
    flex: 0 0 auto;
    width: auto;
  }

  .side {
    width: auto;
    min-width: 0;
    flex: 0 1 38%;
    max-width: 38%;
    box-sizing: border-box;
    height: auto;
    min-height: auto;
    overflow: auto;
  }

  .main {
    min-width: 0;
    flex: 1 1 62%;
    max-width: 62%;
    height: auto;
    min-height: auto;
  }

  .main iframe {
    min-height: 70svh;
  }
}