:root{color-scheme:light;--bg: #eef2f6;--card: #ffffff;--card-muted: #f8fafc;--line: #dbe4ee;--line-strong: #c5d1df;--text: #10233a;--text-muted: #4a6078;--accent: #2563eb;--accent-soft: rgba(37, 99, 235, .12);--success: #0f766e;--danger: #b42318;--shadow: 0 18px 48px rgba(15, 23, 42, .08), 0 3px 14px rgba(15, 23, 42, .05);--radius-xl: 24px;--radius-lg: 18px;--radius-md: 14px;--radius-sm: 10px}*{box-sizing:border-box}html,body{margin:0;min-height:100%;background:radial-gradient(circle at top,#f8fbff 0,var(--bg) 45%,#e9eef5 100%);color:var(--text);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif}body{padding:24px}code{font-family:ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,Liberation Mono,monospace}.page-shell{width:min(1440px,100%);margin:0 auto;display:flex;flex-direction:column;gap:24px}.panel,.hero-card{background:#ffffffeb;border:1px solid rgba(219,228,238,.95);box-shadow:var(--shadow);backdrop-filter:blur(16px)}.hero-card{border-radius:var(--radius-xl);padding:28px 32px;display:flex;justify-content:space-between;align-items:flex-start;gap:20px}.eyebrow{display:inline-flex;align-items:center;gap:8px;padding:8px 12px;border-radius:999px;background:var(--accent-soft);color:var(--accent);font-size:13px;font-weight:700}h1,h2{margin:0}#heroTitle{margin-top:16px;font-size:clamp(2rem,5vw,3.3rem);line-height:1.05}#heroSubtitle{margin:14px 0 0;max-width:880px;font-size:1rem;line-height:1.7;color:var(--text-muted)}.hero-actions{display:flex;align-items:center;gap:12px}.language-switch{display:inline-flex;padding:4px;border-radius:999px;background:var(--card-muted);border:1px solid var(--line)}.lang-button,.segmented-control__button,.secondary-button,.drop-zone__button{border:0;background:transparent;color:var(--text);cursor:pointer;font:inherit}.lang-button{min-width:62px;padding:10px 14px;border-radius:999px;font-weight:700;color:var(--text-muted)}.lang-button.is-active,.segmented-control__button.is-active{background:#fff;color:var(--accent);box-shadow:0 1px 3px #0f172a14}.main-grid{display:grid;grid-template-columns:minmax(0,2fr) minmax(320px,1fr);gap:24px}.panel{border-radius:var(--radius-lg);padding:24px}.panel-description{margin:10px 0 0;color:var(--text-muted);line-height:1.6}.drop-zone{position:relative;margin-top:22px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:8px;min-height:240px;padding:28px;border:1.5px dashed var(--line-strong);border-radius:var(--radius-lg);background:linear-gradient(180deg,#2563eb0d,#ffffffeb);text-align:center;cursor:pointer;transition:border-color .16s ease,transform .16s ease,background .16s ease}.drop-zone:hover,.drop-zone.is-dragover{border-color:var(--accent);transform:translateY(-1px);background:linear-gradient(180deg,#2563eb17,#fffffffa)}.drop-zone input{position:absolute;inset:0;opacity:0;cursor:pointer}.drop-zone__icon{font-size:2rem}.drop-zone__title{font-size:1.2rem;font-weight:800}.drop-zone__hint{color:var(--text-muted)}.drop-zone__button{margin-top:8px;display:inline-flex;align-items:center;justify-content:center;padding:12px 18px;border-radius:999px;background:var(--accent);color:#fff;font-weight:700}.option-list{margin-top:20px;display:grid;gap:12px}.toggle-row{display:flex;justify-content:space-between;gap:16px;align-items:center;padding:14px 16px;border-radius:var(--radius-md);background:var(--card-muted);border:1px solid var(--line)}.toggle-row strong{display:block;margin-bottom:4px}.toggle-row small{display:block;color:var(--text-muted);line-height:1.5}.toggle-row input{inline-size:20px;block-size:20px;accent-color:var(--accent)}.toolbar-row{margin-top:20px;display:flex;flex-wrap:wrap;justify-content:space-between;gap:12px;align-items:center}.segmented-control{display:inline-flex;padding:4px;border-radius:999px;background:var(--card-muted);border:1px solid var(--line)}.segmented-control__button{padding:10px 16px;border-radius:999px;color:var(--text-muted);font-weight:700}.secondary-button{padding:11px 15px;border-radius:12px;border:1px solid var(--line);background:#fff;font-weight:700}.status-card{margin-top:20px;padding:16px 18px;border-radius:var(--radius-md);background:var(--card-muted);border:1px solid var(--line)}.status-card[data-state=working]{border-color:#2563eb59;background:#2563eb0f}.status-card[data-state=error]{border-color:#b4231840;background:#b423180f}.status-card__label{font-size:.92rem;font-weight:800}.status-card__text{margin-top:6px;color:var(--text-muted);line-height:1.55}.progress-track{margin-top:12px;inline-size:100%;block-size:8px;border-radius:999px;background:#94a3b82e;overflow:hidden}.progress-track__bar{inline-size:0%;block-size:100%;border-radius:inherit;background:linear-gradient(90deg,#60a5fa,#2563eb);transition:inline-size .18s ease}.metadata-grid{margin:22px 0 0;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}.metadata-grid div{padding:14px 16px;border-radius:var(--radius-md);background:var(--card-muted);border:1px solid var(--line)}.metadata-grid dt{font-size:.88rem;color:var(--text-muted)}.metadata-grid dd{margin:6px 0 0;font-size:1rem;font-weight:700;line-height:1.45;word-break:break-word}.viewer-panel__header{display:flex;justify-content:space-between;align-items:flex-start;gap:18px}.viewer-mode-pill{display:inline-flex;align-items:center;justify-content:center;padding:10px 14px;border-radius:999px;background:var(--card-muted);border:1px solid var(--line);font-size:.92rem;font-weight:800;white-space:nowrap}.viewer-empty{margin-top:20px;min-height:320px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:10px;border-radius:var(--radius-lg);border:1px dashed var(--line-strong);background:linear-gradient(180deg,#f8fafceb,#fffffffa);color:var(--text-muted);text-align:center;padding:28px}.viewer-empty--loading{border-color:#2563eb47;background:linear-gradient(180deg,#2563eb14,#fffffffa)}.viewer-empty--error{border-color:#b423183d;background:linear-gradient(180deg,#b423180f,#fffffffa)}.viewer-empty strong{color:var(--text);font-size:1.12rem}.viewer-host{margin-top:20px;inline-size:100%;overflow-x:auto}#viewerHost .ppt-viewer{inline-size:100%;padding:0;background:transparent;gap:24px;align-items:stretch}.demo-slide-shell{inline-size:100%;border-radius:18px;padding:18px;background:linear-gradient(180deg,#f7f9fc,#eff3f8);border:1px solid var(--line);overflow:visible}.demo-slide-viewport{transform-origin:top left;will-change:transform}#viewerHost .ppt-viewer-slide{border-radius:12px}@media(max-width:980px){body{padding:16px}.hero-card,.panel{padding:20px}.main-grid{grid-template-columns:1fr}.viewer-panel__header,.hero-card{flex-direction:column}.hero-actions{inline-size:100%;justify-content:flex-start}}@media(max-width:640px){.metadata-grid{grid-template-columns:1fr}.toolbar-row{align-items:stretch}.segmented-control,.secondary-button{inline-size:100%}.segmented-control{justify-content:space-between}.segmented-control__button{flex:1 1 0}}