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transparent;border-top-color:var(--accent);border-radius:50%;animation:export-spin .9s linear infinite}.export-status.done .export-spinner:before,.export-status.failed .export-spinner:before{animation:none;border-top-color:transparent}.export-status.done .export-spinner{color:#2f7d56;border-color:#2f7d565c;background:#2f7d561a}.export-status.failed .export-spinner{color:#b94b4b;border-color:#b94b4b5c;background:#b94b4b1a}.export-detail{margin:0;color:var(--muted);line-height:1.45}.export-progress{height:10px;overflow:hidden;border:1px solid var(--line);border-radius:999px;background:var(--input-bg)}.export-progress span{display:block;height:100%;border-radius:inherit;background:linear-gradient(90deg,#2f7d56,#89b86c);transition:width .22s ease}.export-status.failed~.export-progress span{background:#b94b4b}.export-steps{display:grid;grid-template-columns:repeat(3,1fr);gap:8px}.export-steps span{min-width:0;border:1px solid var(--line);border-radius:8px;color:var(--muted);background:var(--input-bg);padding:8px 10px;text-align:center;font-size:12px;font-weight:900}.export-steps span.active,.export-steps span.done{color:var(--text);border-color:color-mix(in srgb,var(--accent) 35%,var(--line));background:color-mix(in srgb,var(--accent) 10%,var(--input-bg))}.export-menu{position:relative;display:inline-flex}.export-menu-list{position:absolute;top:calc(100% + 8px);right:0;z-index:15;min-width:190px;display:grid;gap:4px;border:1px solid var(--line);border-radius:8px;background:var(--panel);box-shadow:var(--shadow);padding:6px}.export-menu-list button{border:0;border-radius:6px;background:transparent;color:var(--text);padding:8px 10px;text-align:left;font-weight:800}.export-menu-list button:hover:not(:disabled){background:var(--active-bg)}@keyframes export-spin{to{transform:rotate(360deg)}}.settings-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:12px}.settings-group{min-width:0;display:grid;grid-template-columns:repeat(auto-fit,minmax(118px,1fr));align-content:start;gap:12px;border:1px solid var(--line);border-radius:8px;padding:12px}.settings-group legend{color:var(--muted);font-size:12px;font-weight:900;padding:0 6px}.settings-group label,.settings-group input,.settings-group select{min-width:0}.settings-checks{grid-column:1 / -1;display:flex;gap:16px;flex-wrap:wrap}.settings-checks label{display:inline-flex;align-items:center;gap:7px}.settings-checks input{width:auto}.empty-state{min-height:420px;display:grid;place-items:center;gap:12px;color:var(--muted)}@media(max-width:1180px){.app-shell{height:auto;min-height:100vh;grid-template-columns:1fr!important;grid-template-rows:auto auto auto auto;overflow:auto}.topbar,.sidebar,.editor-region,.preview-panel{grid-column:1}.resize-handle{display:none}.sidebar{max-height:420px;border-right:0;border-bottom:1px solid var(--line)}.preview-panel{min-height:720px;border-left:0;border-top:1px solid var(--line)}}@media(max-width:760px){.topbar,.editor-toolbar,.preview-header{align-items:flex-start;flex-direction:column}.topbar{padding:14px}.topbar-status{width:100%;flex-wrap:wrap}.title-grid,.lyric-lane{grid-template-columns:1fr}.paper-sheet{min-width:0;padding:48px 28px 54px}}