:root{--toolbar-height: 52px;--surface: #ffffff;--text: #1a1a1a;--muted: #5c6570;--border: #e2e6eb;--primary: #1a73e8;--primary-hover: #1557b0;--danger: #c5221f;--warning-bg: #fff8e1;--warning-border: #f9a825;--shadow: 0 8px 32px rgba(0, 0, 0, .12);--radius: 12px;--ink: #0b0f14;--ink-elevated: #121821;--paper: #e8eef5;--steel: #8b9bb4;--cyan: #3ddcff;--cyan-dim: rgba(61, 220, 255, .14);--amber: #e8a54b;--amber-ink: #0b0f14;--line: rgba(232, 238, 245, .12);--line-strong: rgba(61, 220, 255, .35);--font-display: "Syne", "Segoe UI", sans-serif;--font-mono: "IBM Plex Mono", ui-monospace, monospace;--space-3: 1rem;--space-4: 1.5rem;--space-5: 2.5rem;--space-6: 4rem;--max: 1120px;--nav-h: 4rem;--ease: cubic-bezier(.22, 1, .36, 1);font-family:Segoe UI,system-ui,-apple-system,sans-serif}*,*:before,*:after{box-sizing:border-box}html,body,#app{margin:0;padding:0;width:100%;height:100%;overflow:hidden}body{color:var(--text);background:var(--ink)}.auth-layout{height:100%;max-height:100%;display:flex;flex-direction:column;overflow-x:hidden;overflow-y:auto;background:var(--ink);-webkit-overflow-scrolling:touch}.auth-layout__body{flex:1 0 auto;display:flex;flex-direction:column;align-items:center;justify-content:flex-start;padding:24px 20px 32px;width:100%;box-sizing:border-box}@supports (justify-content: safe center){.auth-layout__body{justify-content:safe center}}.app-header{text-align:center;padding:0 20px 20px;color:#fff;max-width:32rem}.app-header__eyebrow{margin:0 0 .4rem;font-family:var(--font-mono);font-size:.75rem;letter-spacing:.06em;text-transform:uppercase;color:var(--cyan)}.app-header h1{margin:0 0 8px;font-family:var(--font-display);font-size:2.25rem;font-weight:700;letter-spacing:-.02em}.app-header p{margin:0;opacity:.9;font-size:1.05rem;line-height:1.5}.panel{background:var(--surface);border-radius:var(--radius);box-shadow:var(--shadow);overflow:hidden}.center-panel,.auth-panel{width:100%;max-width:480px;margin:0 auto;padding:28px;text-align:center}.auth-panel h2{margin:0 0 20px;font-size:1.35rem}.auth-footer{margin:16px 0 0;font-size:.9rem;line-height:1.45}.auth-footer a{color:var(--primary)}.btn-microsoft{display:inline-flex;align-items:center;justify-content:center;gap:12px;min-height:41px;padding:0 12px;border:1px solid #8c8c8c;border-radius:0;background:#fff;color:#5e5e5e;font-family:Segoe UI,system-ui,sans-serif;font-size:15px;font-weight:600;cursor:pointer;transition:background .15s ease,border-color .15s ease}.btn-microsoft:hover:not(:disabled){background:#f3f3f3;border-color:#8c8c8c;color:#5e5e5e}.btn-microsoft:disabled{opacity:.55;cursor:not-allowed}.btn-microsoft__icon{display:inline-flex;flex-shrink:0;width:21px;height:21px}.btn-microsoft__label{line-height:1}[data-site-nav]{display:block;flex-shrink:0;min-height:var(--nav-h)}[data-site-footer]{display:block;flex-shrink:0;width:100%;margin-top:auto;box-sizing:border-box}.muted{color:var(--muted);line-height:1.5}.alert{text-align:left;padding:12px 14px;border-radius:8px;margin-bottom:16px;font-size:.9rem;line-height:1.45}.alert-warning{background:var(--warning-bg);border:1px solid var(--warning-border)}.alert code{font-size:.85em;word-break:break-all}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:none;border-radius:8px;padding:8px 14px;font-size:.9rem;font-weight:600;cursor:pointer;transition:background .15s ease,opacity .15s ease;white-space:nowrap}.btn:disabled{opacity:.5;cursor:not-allowed}.btn-primary{background:var(--primary);color:#fff}.btn-primary:hover:not(:disabled){background:var(--primary-hover)}.btn-ghost{background:transparent;color:var(--danger)}.btn-ghost:hover:not(:disabled){background:#fce8e6}.workspace{display:flex;flex-direction:column;width:100%;height:100%;background:#111}.toolbar{flex:0 0 var(--toolbar-height);height:var(--toolbar-height);display:flex;align-items:center;justify-content:space-between;gap:12px;padding:0 12px 0 16px;border-bottom:1px solid var(--border);background:#f8fafc;color:var(--text);min-width:0}.toolbar-left{display:flex;align-items:baseline;gap:10px;min-width:0;flex:1}.file-name{font-weight:600;font-size:.95rem;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;min-width:0}.file-status{font-size:.8rem;flex-shrink:0}.toolbar-actions{display:flex;align-items:center;gap:8px;flex-shrink:0}.toolbar-privacy{padding:6px 8px;color:var(--muted);font-size:.85rem;font-weight:500;text-decoration:none;border-radius:6px}.toolbar-privacy:hover{color:var(--primary);background:#1a73e814}.user-chip{display:flex;align-items:center;gap:8px;min-width:0;max-width:180px}.user-chip img{border-radius:50%;object-fit:cover;background:#ddd;flex-shrink:0}.user-chip span{font-weight:500;font-size:.85rem;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.viewer-host{position:relative;flex:1;min-height:0;background:#111}.welcome{position:absolute;top:0;right:0;bottom:0;left:0;display:flex;align-items:center;justify-content:center;background:#111;color:#9aa3ad;padding:24px;text-align:center}.cad-embed{width:100%;height:100%;border:0;display:block;background:#111}.viewer-overlay{position:absolute;top:0;right:0;bottom:0;left:0;z-index:2;display:flex;align-items:center;justify-content:center;background:#111111d9;color:#c8d0d8}.overlay-block{display:flex;flex-direction:column;align-items:center;gap:12px;text-align:center;padding:24px}.spinner{width:36px;height:36px;border:3px solid #3a4450;border-top-color:var(--primary);border-radius:50%;animation:spin .8s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}[hidden]{display:none!important}@media (max-width: 768px){.app-header h1{font-size:1.75rem}.auth-layout__body{padding:16px 16px 24px}.center-panel,.auth-panel{padding:24px 20px}.user-chip span{display:none}.toolbar{padding:0 8px}.btn{padding:8px 10px;font-size:.8rem}}@media (max-height: 820px){.app-header h1{font-size:1.85rem}.center-panel,.auth-panel{padding:22px 24px}}html.is-embedded .nav,html.is-embedded .footer,html.is-embedded .app-header{display:none}html.is-embedded .auth-layout__body{justify-content:center}