.install-ext{gap:0;min-height:100vh}.install-ext__intro{margin-bottom:var(--gap-2xl)}.install-ext__subtitle{max-width:560px}.install-ext__layout{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:start}.install-ext__sidebar{position:sticky;top:24px;display:flex;flex-direction:column;align-items:center;gap:16px;order:-1}.install-ext__download-btn{text-decoration:none;height:40px;padding:0 20px;font-size:var(--font-size-md);white-space:nowrap}.install-ext__steps-wrap{max-width:640px}@media (max-width:768px){.install-ext__layout{grid-template-columns:1fr}.install-ext__sidebar{position:static;order:-1}}.install-ext__steps-label{font-size:var(--font-size-sm);font-weight:var(--font-weight-semibold);text-transform:uppercase;letter-spacing:.04em;color:var(--color-text-faint);margin-bottom:var(--gap-lg)}.install-ext__timeline{display:flex;flex-direction:column}.install-ext__tl-step{display:flex;gap:14px}.install-ext__tl-rail{flex-direction:column}.install-ext__tl-dot,.install-ext__tl-rail{display:flex;align-items:center;flex-shrink:0;width:28px}.install-ext__tl-dot{height:28px;border-radius:50%;background:var(--color-surface-alt);border:1px solid var(--color-border);justify-content:center;color:var(--color-text-muted)}.install-ext__tl-line{width:2px;flex:1;min-height:16px;background:var(--color-divider);margin:4px 0}.install-ext__tl-content{flex:1;padding:3px 0 18px}.install-ext__tl-step:last-child .install-ext__tl-content{padding-bottom:0}.install-ext__step-title{font-size:var(--font-size-md);font-weight:var(--font-weight-bold);color:var(--color-text);line-height:20px}.install-ext__step-desc{font-size:var(--font-size-base);color:var(--color-text-faint);line-height:19px;margin-top:3px}.install-ext__illus-wrap{margin-top:10px}.install-ext__illus{width:100%;max-width:320px;height:auto}.install-ext__illus--sm{max-width:200px}.install-ext__brand-card{display:flex;flex-direction:column;align-items:center;gap:8px;padding:28px 20px;border-radius:var(--radius-lg);border:1px solid var(--color-border);background:var(--color-surface);text-align:center}.install-ext__brand-logo{width:56px;height:56px;-o-object-fit:contain;object-fit:contain}.install-ext__brand-name{font-size:18px;font-weight:700;color:var(--color-text)}.install-ext__brand-tagline{font-size:var(--font-size-sm);color:var(--color-text-faint);line-height:1.4}.install-ext__brand-version{font-size:var(--font-size-xs);color:var(--color-text-faint);background:var(--color-surface-alt);padding:2px 10px;border-radius:var(--radius-full)}.install-ext__note{padding:14px 18px;border-radius:var(--radius-lg);background:rgba(59,130,246,.06);border:1px solid rgba(59,130,246,.15);font-size:var(--font-size-sm);line-height:19px;color:var(--color-text-secondary)}.install-ext__spacer{height:40px}