:root{--header-height:56px;--sidebar-width:300px;--color-bg:#f8f9fa;--color-surface:#ffffff;--color-border:#e0e4ea;--color-text:#1f2937;--color-muted:#6b7280;--color-primary:#1a3a5c;--color-primary-hover:#2c5f8a;--color-active-bg:#eef3f9}*{box-sizing:border-box}body,html{margin:0;padding:0;background:var(--color-bg);color:var(--color-text);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif;font-size:14px;line-height:1.5;height:100%}a{color:var(--color-primary);text-decoration:none}a:hover{text-decoration:underline}.app-header{position:-webkit-sticky;position:sticky;top:0;z-index:50;height:var(--header-height);background:var(--color-primary);color:#fff;display:flex;align-items:center;justify-content:space-between;padding:0 20px;box-shadow:0 1px 3px rgba(0,0,0,.1)}.app-header .brand{font-weight:600;font-size:1.05em;color:#fff;letter-spacing:.2px}.app-header .brand:hover{text-decoration:none;opacity:.9}.user-menu{display:flex;align-items:center;gap:10px;font-size:.9em}.user-menu .avatar{width:26px;height:26px;border-radius:50%;border:1px solid rgba(255,255,255,.4)}.user-menu .login{color:#fff;opacity:.95}.user-menu .signin,.user-menu .signout{background:rgba(255,255,255,.12);color:#fff;border:1px solid rgba(255,255,255,.25);padding:4px 10px;border-radius:4px;cursor:pointer;font-size:.85em}.user-menu .signin:hover,.user-menu .signout:hover{background:rgba(255,255,255,.22)}.app-shell{display:flex;min-height:calc(100vh - var(--header-height))}.sidebar{width:var(--sidebar-width);flex-shrink:0;background:var(--color-surface);border-right:1px solid var(--color-border);padding:16px 12px;position:-webkit-sticky;position:sticky;top:var(--header-height);height:calc(100vh - var(--header-height));overflow-y:auto}.sidebar .home-link{display:block;padding:6px 8px;margin-bottom:8px;border-radius:4px;font-weight:600;color:var(--color-primary)}.sidebar .home-link.active,.sidebar .home-link:hover{background:var(--color-active-bg);text-decoration:none}.sidebar .empty{color:var(--color-muted);padding:8px;font-style:italic}.sidebar ul.children,.sidebar ul.tree{list-style:none;padding:0;margin:0}.sidebar ul.children{padding-left:14px;border-left:1px dashed var(--color-border);margin-left:8px}.sidebar li{margin:2px 0}.sidebar .folder-toggle{width:100%;text-align:left;background:transparent;border:none;padding:5px 6px;cursor:pointer;display:flex;align-items:center;gap:6px;font-size:.92em;color:var(--color-text);font-weight:600;border-radius:3px}.sidebar .folder-toggle:hover{background:var(--color-active-bg)}.sidebar .chev{display:inline-block;transition:transform .15s ease;color:var(--color-muted);font-size:.85em}.sidebar .chev.open{transform:rotate(90deg)}.sidebar .doc-link{display:block;padding:4px 8px;border-radius:3px;color:var(--color-text);font-size:.88em;line-height:1.3}.sidebar .doc-link:hover{background:var(--color-active-bg);text-decoration:none}.sidebar .doc-link.active{background:var(--color-active-bg);color:var(--color-primary);font-weight:600}.main{flex:1 1;display:flex;flex-direction:column;min-width:0}.breadcrumbs{background:var(--color-surface);border-bottom:1px solid var(--color-border);padding:8px 20px;font-size:.85em}.breadcrumbs ol{list-style:none;padding:0;margin:0;display:flex;flex-wrap:wrap;gap:6px}.breadcrumbs li{display:flex;align-items:center;gap:6px}.breadcrumbs .sep,.breadcrumbs li{color:var(--color-muted)}.breadcrumbs li:last-child span{color:var(--color-text);font-weight:500}.doc-frame{flex:1 1;width:100%;border:none;background:var(--color-bg);min-height:calc(100vh - var(--header-height) - 40px)}.placeholder{padding:48px;max-width:720px;margin:0 auto}.placeholder h1{color:var(--color-primary);margin-top:0}.placeholder .meta{color:var(--color-muted);font-size:.85em}.auth-page{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:24px}.auth-card{background:var(--color-surface);border:1px solid var(--color-border);border-radius:8px;padding:32px;max-width:420px;width:100%;box-shadow:0 10px 30px rgba(0,0,0,.05);text-align:center}.auth-card h1{color:var(--color-primary);margin:0 0 8px;font-size:1.4em}.auth-card p{color:var(--color-muted);margin:6px 0 20px}.auth-card .signin-button{display:inline-flex;align-items:center;gap:8px;background:#24292f;color:#fff;padding:10px 18px;border-radius:6px;border:none;cursor:pointer;font-size:.95em;font-weight:500}.auth-card .signin-button:hover{background:#1f2328}