:root{--bg: #f3f6fb;--panel: rgba(255, 255, 255, .82);--panel-strong: #ffffff;--text: #102033;--muted: #6b7a90;--line: rgba(16, 32, 51, .08);--blue: #2f6bff;--blue-2: #67a4ff;--green: #2cc58a;--yellow: #ffbf3c;--shadow: 0 24px 60px rgba(15, 29, 48, .12)}*{box-sizing:border-box}html,body{height:100%}body{margin:0;font-family:Inter,system-ui,sans-serif;color:var(--text);background:radial-gradient(circle at top left,rgba(47,107,255,.16),transparent 28%),radial-gradient(circle at 85% 10%,rgba(44,197,138,.14),transparent 22%),linear-gradient(180deg,#f7f9fc,#eef3f9)}.auth-screen{position:fixed;top:0;right:0;bottom:0;left:0;display:grid;place-items:center;padding:24px;background:radial-gradient(circle at top left,rgba(47,107,255,.22),transparent 26%),radial-gradient(circle at 80% 15%,rgba(44,197,138,.2),transparent 20%),linear-gradient(180deg,#f8fbff,#eef4fb);z-index:20}.auth-screen[hidden]{display:none}.auth-card{width:min(100%,460px);padding:30px;border-radius:28px;border:1px solid var(--line);background:#ffffffd1;-webkit-backdrop-filter:blur(18px);backdrop-filter:blur(18px);box-shadow:var(--shadow)}.auth-brand{display:flex;align-items:center;gap:12px;margin-bottom:24px}.auth-card h1{margin:0;font-size:clamp(2rem,5vw,3rem);letter-spacing:-.04em}.auth-card p{color:var(--muted);line-height:1.6}.auth-fields{display:grid;gap:12px;margin:22px 0}.auth-status{min-height:1.4em;margin-top:6px;color:var(--muted);font-size:.95rem}.auth-status#otpStatus{color:var(--blue);font-weight:700}.auth-fields input,.share-row input,.share-row select,.search input{width:100%;border:1px solid var(--line);border-radius:16px;background:#ffffffe6;padding:13px 14px;font:inherit;color:var(--text)}.auth-actions{display:flex;gap:12px}.auth-actions .primary-btn,.auth-actions .secondary-btn{flex:1}.app-shell{display:grid;grid-template-columns:280px 1fr;min-height:100vh}.sidebar{padding:24px;border-right:1px solid var(--line);background:#ffffff73;-webkit-backdrop-filter:blur(18px);backdrop-filter:blur(18px)}.brand{display:flex;gap:14px;align-items:center;margin-bottom:24px}.brand-mark{width:46px;height:46px;border-radius:14px;display:grid;place-items:center;color:#fff;font-weight:800;background:linear-gradient(135deg,var(--blue),var(--green));box-shadow:var(--shadow)}.brand-name{font-size:1.05rem;font-weight:800}.brand-subtitle{color:var(--muted);font-size:.9rem}.compose-btn,.upload-btn,.nav-item,.primary-btn,.secondary-btn{border:0;border-radius:16px;font:inherit;cursor:pointer}.compose-btn,.upload-btn{width:100%;padding:14px 16px;color:#fff;font-weight:700;margin-bottom:10px;box-shadow:var(--shadow)}.compose-btn{background:linear-gradient(135deg,var(--blue),#154ae3)}.upload-btn{background:linear-gradient(135deg,#1cce9c,#0d9f73)}.nav{display:grid;gap:8px;margin:22px 0}.nav-item{text-align:left;padding:12px 14px;background:transparent;color:var(--text)}.nav-item.active,.nav-item:hover{background:#2f6bff1a;color:var(--blue)}.tree-card{margin-top:18px;padding:16px;border:1px solid var(--line);border-radius:22px;background:#ffffffad}.tree-head{display:flex;justify-content:space-between;align-items:center;gap:10px;margin-bottom:12px;font-weight:700}.tree-home{border:1px solid var(--line);background:#fff;color:var(--text);border-radius:999px;padding:6px 10px;cursor:pointer;font:inherit}.tree-list{display:grid;gap:8px}.tree-item{display:flex;justify-content:space-between;align-items:center;gap:10px;padding:10px 12px;border-radius:14px;cursor:pointer;border:1px solid transparent;background:#fffc}.tree-item.active{border-color:#2f6bff40;background:#2f6bff14}.tree-item.drop-target{outline:2px dashed rgba(47,107,255,.6)}.tree-name{display:flex;align-items:center;gap:8px}.tree-badge{color:var(--muted);font-size:.85rem}.storage-card{margin-top:24px;padding:18px;border:1px solid var(--line);border-radius:22px;background:var(--panel);box-shadow:var(--shadow)}.storage-head{display:flex;justify-content:space-between;gap:12px;font-size:.92rem;font-weight:600}.storage-bar{height:10px;background:#e8eef7;border-radius:999px;overflow:hidden;margin:14px 0 10px}.storage-fill{height:100%;width:28%;background:linear-gradient(90deg,var(--blue),var(--green))}.storage-card p{margin:0;color:var(--muted);font-size:.92rem}.main{padding:28px}.topbar{display:flex;justify-content:space-between;gap:18px;align-items:end;margin-bottom:22px}.topbar h1,.hero h2,.panel h3{margin:0}.topbar p,.hero p{margin:8px 0 0;color:var(--muted)}.search{min-width:280px;max-width:360px;width:100%;background:#fffc;border:1px solid var(--line);border-radius:16px;padding:12px 14px}.search input{width:100%;border:0;outline:none;background:transparent;font:inherit}.hero{display:flex;justify-content:space-between;gap:24px;padding:24px;border:1px solid var(--line);border-radius:28px;background:var(--panel);box-shadow:var(--shadow)}.hero-label{color:var(--blue);font-size:.82rem;font-weight:800;text-transform:uppercase;letter-spacing:.12em}.hero h2{margin-top:10px;font-size:clamp(1.5rem,2vw,2.4rem);max-width:16ch}.hero-actions{display:flex;align-items:end;gap:12px;flex-wrap:wrap}.crumb-row{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin-top:16px}.crumb{display:inline-flex;padding:10px 12px;border-radius:999px;background:#2f6bff14;color:var(--blue);font-size:.88rem;font-weight:700}.crumb-back{border:1px solid var(--line);background:#fff;color:var(--text);border-radius:999px;padding:10px 14px;cursor:pointer;font:inherit;font-weight:700}.crumb-back:disabled{opacity:.45;cursor:not-allowed}.primary-btn,.secondary-btn{padding:13px 16px;font-weight:700}.primary-btn{background:var(--text);color:#fff}.secondary-btn{background:#fff;color:var(--text);border:1px solid var(--line)}.content-grid{display:grid;grid-template-columns:1.2fr 1.8fr .9fr;gap:18px;margin-top:18px}.panel{min-height:220px;padding:18px;border-radius:24px;border:1px solid var(--line);background:var(--panel-strong);box-shadow:var(--shadow)}.panel-head{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-bottom:16px}.panel-head span{color:var(--muted);font-size:.92rem}.detail-actions{display:flex;gap:8px;flex-wrap:wrap}.bulk-bar{display:grid;gap:10px;margin-bottom:14px;padding:14px;border-radius:18px;background:#2f6bff0f;border:1px solid rgba(47,107,255,.12)}.bulk-actions{display:flex;flex-wrap:wrap;gap:8px}.danger-btn{background:#d94848}.folder-strip{display:grid;gap:12px}.folder-card{padding:14px;border-radius:18px;background:linear-gradient(180deg,#f7faff,#edf3ff);border:1px solid rgba(47,107,255,.12);cursor:pointer}.folder-card.active{outline:2px solid rgba(47,107,255,.25)}.folder-top{display:flex;justify-content:space-between;gap:12px;align-items:center}.folder-menu-btn,.tree-menu-btn{border:0;background:transparent;color:var(--muted);font-size:1.3rem;cursor:pointer;padding:4px 6px;line-height:1}.folder-menu-btn:hover,.tree-menu-btn:hover{color:var(--blue)}.folder-icon,.file-icon{width:38px;height:38px;border-radius:13px;display:grid;place-items:center;color:#fff;font-weight:800}.folder-meta,.file-meta{color:var(--muted);font-size:.88rem;margin-top:8px}.file-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:12px}.file-card{position:relative;padding:14px;border-radius:18px;border:1px solid var(--line);background:#fbfcfe;cursor:pointer}.file-card.selected{border-color:#2f6bff73;background:#2f6bff0d}.file-card[draggable=true]{cursor:grab}.file-card.dragging{opacity:.55}.file-card.active{border-color:#2f6bff59;box-shadow:0 12px 28px #2f6bff1f}.file-check{position:absolute;top:12px;right:12px;width:18px;height:18px}.file-title{margin:12px 0 4px;font-weight:700}.file-row{display:flex;justify-content:space-between;gap:12px;color:var(--muted);font-size:.86rem}.dropzone{position:relative;border-style:dashed;border-color:#2f6bff2e}.dropzone.dragover{background:#67a4ff0f}.dropzone.file-drop-target{outline:2px dashed rgba(47,107,255,.5)}.drop-hint{margin-top:14px;padding:14px;border-radius:16px;background:#2f6bff0f;color:var(--muted);font-size:.92rem}.details-view{display:grid;gap:14px}.detail-item{padding:14px;border-radius:18px;background:#f8fbff;border:1px solid var(--line)}.detail-label{color:var(--muted);font-size:.84rem;margin-bottom:6px}.detail-value{font-weight:700;word-break:break-word}.preview-pane,.share-box{margin-bottom:14px;padding:14px;border-radius:18px;border:1px solid var(--line);background:#f8fbff}.share-box+.share-box{margin-top:14px}.preview-pane{min-height:140px;white-space:pre-wrap}.preview-editor{width:100%;min-height:120px;border:1px solid var(--line);border-radius:14px;padding:12px;font:inherit;resize:vertical;background:#fff}.preview-save{margin-top:10px}.preview-empty{color:var(--muted)}.preview-title{font-weight:800;margin-bottom:8px}.preview-meta{color:var(--muted);font-size:.88rem;margin-bottom:10px}.file-viewer{width:100%;min-height:280px;border:1px solid var(--line);border-radius:14px;background:#fff}.image-viewer{object-fit:contain;max-height:420px}.preview-note{color:var(--muted);font-size:.88rem;margin-bottom:10px}.sheet-pre{margin:0;padding:12px;border-radius:12px;background:#fff;border:1px solid var(--line);white-space:pre-wrap;overflow:auto}.ifc-viewer{width:100%;min-height:360px;border-radius:14px;overflow:hidden;border:1px solid var(--line);background:#fff}.share-head,.share-row{display:flex;justify-content:space-between;gap:10px;align-items:center}.share-row{margin:10px 0}.share-row select,#shareLink{width:100%;border:1px solid var(--line);border-radius:12px;padding:10px 12px;font:inherit;background:#fff}#shareLink{margin-top:10px}#roleSelect,#userInput,#authUser,#authPass,#inviteUser,#inviteRole{width:100%;border:1px solid var(--line);border-radius:12px;padding:10px 12px;font:inherit;background:#fff}.context-menu{position:fixed;z-index:50;min-width:180px;padding:8px;border-radius:16px;border:1px solid var(--line);background:#fffffffa;box-shadow:var(--shadow)}.context-menu button{display:block;width:100%;padding:10px 12px;border:0;background:transparent;text-align:left;cursor:pointer;border-radius:12px;font:inherit}.context-menu button:hover{background:#2f6bff14}@media (max-width: 1100px){.app-shell,.content-grid{grid-template-columns:1fr}.sidebar{border-right:0;border-bottom:1px solid var(--line)}.topbar,.hero{flex-direction:column;align-items:stretch}.search{max-width:none;min-width:0}}