.studio-hub { max-width: 960px; margin-inline: auto; }
.studio-hub__header, .studio-hub__section-header, .studio-hub__card { display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.studio-hub__header h1 { margin: 0; font-size: clamp(24px, 4vw, 34px); }
.studio-hub__section { margin-block: 28px; }
.studio-hub__join { display: flex; justify-content: flex-end; }
.studio-hub__section h2 { margin: 0 0 14px; font-size: 20px; }
.studio-hub__section-header h2 { margin: 0; }
.studio-hub__section-header { margin-bottom: 14px; }
.studio-hub__list { display: grid; gap: 12px; }
.studio-hub__card, .studio-hub__course { padding: 20px; border: 1px solid var(--studio-border, #dce3ec); border-radius: 16px; background: var(--studio-panel, #fff); min-width: 0; }
.studio-hub h3 { margin: 0; font-size: 17px; overflow-wrap: anywhere; }
.studio-hub p { margin: 8px 0 0; color: var(--studio-muted, #526179); font-size: 14px; }
.studio-hub__modes { display: flex; gap: 12px; margin-block: 24px; }
.studio-hub__modes a { display: flex; justify-content: center; align-items: center; flex: 1; min-height: 52px; padding: 12px 16px; border: 1px solid #c4d2e6; border-radius: 12px; color: #294267; background: #fff; font-weight: 700; text-decoration: none; }
.studio-hub__modes a[aria-current] { border-color: #2563eb; background: #eff6ff; color: #174eb6; }
.studio-hub__course-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; }
.studio-hub__course .studio-button { margin-top: 16px; }
.studio-hub__replay { display: inline-block; min-height: 44px; padding: 12px; color: #294267; }
.studio-hub__empty { padding: 20px; border: 1px solid #dce3ec; border-radius: 12px; }
.studio-hub .studio-button { flex-shrink: 0; min-height: 44px; text-align: center; white-space: nowrap; }
.studio-hub a:focus-visible { outline: 3px solid #2563eb; outline-offset: 3px; }
@media (max-width: 600px) {
    .studio-hub__card { align-items: stretch; flex-direction: column; }
    .studio-hub__course-grid { grid-template-columns: 1fr; }
    .studio-hub__header, .studio-hub__section-header { flex-wrap: wrap; }
    .studio-hub__modes { gap: 8px; }
    .studio-hub__card .studio-button { width: 100%; }
}