:root{
  --brand:#4f46e5; --brand-2:#7c3aed; --brand-soft:#eef0ff;
  --side-bg:#121436; --side-text:#b9bce0; --side-active:#ffffff;
  --bg:#f4f6fb; --card:#ffffff; --border:#e6e8f0; --text:#1d2033; --muted:#6b7090;
  --radius:14px;
}
*{box-sizing:border-box}
body{font-family:'Plus Jakarta Sans',system-ui,-apple-system,'Segoe UI',sans-serif;background:var(--bg);color:var(--text);font-size:14.5px}
a{text-decoration:none}
.btn-primary{background:var(--brand);border-color:var(--brand)}
.btn-primary:hover,.btn-primary:focus{background:#4338ca;border-color:#4338ca}
.text-primary{color:var(--brand)!important}
.bg-primary{background-color:var(--brand)!important}
.form-control,.form-select{border-radius:10px;border-color:var(--border);padding:.55rem .8rem}
.form-control:focus,.form-select:focus{border-color:var(--brand);box-shadow:0 0 0 .2rem rgba(79,70,229,.15)}
.form-check-input:checked{background-color:var(--brand);border-color:var(--brand)}
.btn{border-radius:10px;font-weight:500}

/* layout */
.app{display:flex;min-height:100vh}
.sidebar{width:262px;background:linear-gradient(180deg,#141640 0%,#0f1030 100%);color:var(--side-text);position:fixed;inset:0 auto 0 0;display:flex;flex-direction:column;z-index:1040;transition:transform .25s}
.brand{display:flex;align-items:center;gap:12px;padding:22px 20px 18px;border-bottom:1px solid rgba(255,255,255,.06)}
.brand-logo{width:42px;height:42px;border-radius:12px;background:linear-gradient(135deg,var(--brand),var(--brand-2));display:grid;place-items:center;color:#fff;font-size:21px;box-shadow:0 6px 18px rgba(124,58,237,.4)}
.brand-name{color:#fff;font-weight:700;font-size:16px;line-height:1.1}
.brand-sub{font-size:11.5px;opacity:.7;letter-spacing:.04em;text-transform:uppercase}
.sidebar .nav{padding:10px 12px;overflow-y:auto;overflow-x:hidden;flex:1 1 auto;min-height:0;flex-wrap:nowrap}
.sidebar .nav::-webkit-scrollbar{width:6px}
.sidebar .nav::-webkit-scrollbar-thumb{background:rgba(255,255,255,.15);border-radius:6px}
.sidebar .nav-link span{white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.sidebar-storage{flex-shrink:0}
.nav-title{font-size:10.5px;text-transform:uppercase;letter-spacing:.1em;opacity:.45;padding:16px 12px 6px}
.sidebar .nav-link{display:flex;align-items:center;gap:12px;color:var(--side-text);padding:10px 12px;border-radius:10px;margin-bottom:2px;font-weight:500}
.sidebar .nav-link i{font-size:17px;width:20px;text-align:center}
.sidebar .nav-link:hover{background:rgba(255,255,255,.06);color:#fff}
.sidebar .nav-link.active{background:linear-gradient(90deg,var(--brand),var(--brand-2));color:#fff;box-shadow:0 6px 16px rgba(79,70,229,.35)}
.sidebar-storage{margin:12px;padding:14px;border-radius:12px;background:rgba(255,255,255,.06);color:#d6d8f5}
.sidebar-storage .progress{background:rgba(255,255,255,.12)}
.sidebar-storage .progress-bar{background:linear-gradient(90deg,#22d3ee,#818cf8)}
.main{margin-left:262px;flex:1;min-width:0;display:flex;flex-direction:column}
.topbar{height:68px;background:#fff;border-bottom:1px solid var(--border);display:flex;align-items:center;padding:0 26px;position:sticky;top:0;z-index:1030}
.page-title{font-size:19px;font-weight:700;margin:0}
.content{padding:24px 26px;flex:1}
.footer{padding:14px 26px;color:var(--muted);font-size:12.5px;border-top:1px solid var(--border);background:#fff}
.search-box{position:relative}
.search-box i{position:absolute;left:12px;top:50%;transform:translateY(-50%);color:var(--muted)}
.search-box input{padding-left:34px;width:280px;background:var(--bg);border-color:transparent}
.user-chip{display:flex;align-items:center;gap:8px;color:var(--text);padding:5px 10px 5px 5px;border-radius:30px;border:1px solid var(--border)}
.avatar{width:32px;height:32px;border-radius:50%;background:linear-gradient(135deg,var(--brand),var(--brand-2));color:#fff;display:grid;place-items:center;font-weight:700;font-size:14px;flex-shrink:0}
.avatar.lg{width:46px;height:46px;font-size:18px}
.sidebar-backdrop{display:none}
@media(max-width:991.98px){
  .sidebar{transform:translateX(-100%)}
  body.sb-open .sidebar{transform:none}
  body.sb-open .sidebar-backdrop{display:block;position:fixed;inset:0;background:rgba(0,0,0,.4);z-index:1035}
  .main{margin-left:0}
  .content{padding:16px}
  .topbar{padding:0 16px}
}

/* cards */
.card{border:1px solid var(--border);border-radius:var(--radius);box-shadow:0 1px 2px rgba(16,24,40,.04)}
.card-header{background:#fff;border-bottom:1px solid var(--border);padding:14px 18px;font-weight:600;border-radius:var(--radius) var(--radius) 0 0!important}
.stat-card{padding:18px;display:flex;gap:14px;align-items:center}
.stat-icon{width:50px;height:50px;border-radius:14px;display:grid;place-items:center;font-size:22px;flex-shrink:0}
.stat-value{font-size:24px;font-weight:700;line-height:1.1}
.stat-label{color:var(--muted);font-size:13px}
.bg-soft-primary{background:#eef0ff;color:#4f46e5}
.bg-soft-success{background:#e6f8ef;color:#139a55}
.bg-soft-warning{background:#fff4e0;color:#d98500}
.bg-soft-danger{background:#ffeaea;color:#d93025}
.bg-soft-info{background:#e5f6fd;color:#0b8ec2}
.bg-soft-purple{background:#f3e8ff;color:#7c3aed}
.table{margin-bottom:0}
.table> :not(caption)>*>*{padding:.75rem .9rem;vertical-align:middle;border-color:var(--border)}
.table thead th{font-size:12px;text-transform:uppercase;letter-spacing:.05em;color:var(--muted);font-weight:600;background:#fafbfe}
.badge-soft{padding:.35em .7em;border-radius:20px;font-weight:600;font-size:11.5px}
.empty-state{text-align:center;padding:60px 20px;color:var(--muted)}
.empty-state i{font-size:54px;color:#c4c8e0;display:block;margin-bottom:10px}

/* file manager */
.fm-toolbar{display:flex;flex-wrap:wrap;gap:8px;align-items:center;margin-bottom:16px}
.breadcrumb{margin:0;font-size:15px;font-weight:600}
.breadcrumb a{color:var(--muted)}
.breadcrumb-item.active{color:var(--text)}
.fm-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(170px,1fr));gap:14px}
.fm-item{background:#fff;border:1px solid var(--border);border-radius:14px;padding:14px;position:relative;cursor:pointer;transition:.15s;user-select:none}
.fm-item:hover{border-color:#c7cbf0;box-shadow:0 6px 18px rgba(30,40,90,.08);transform:translateY(-1px)}
.fm-item.selected{border-color:var(--brand);background:#f5f6ff;box-shadow:0 0 0 2px rgba(79,70,229,.25)}
.fm-item .fm-icon{font-size:44px;line-height:1;margin:6px 0 10px}
.fm-item .fm-name{font-weight:600;font-size:13.5px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.fm-item .fm-meta{font-size:12px;color:var(--muted)}
.fm-item .fm-check{position:absolute;top:10px;left:10px;opacity:0}
.fm-item:hover .fm-check,.fm-item.selected .fm-check,.fm-selecting .fm-item .fm-check{opacity:1}
.fm-item .fm-menu{position:absolute;top:6px;right:6px}
.fm-item .fm-menu .btn{padding:2px 7px;color:var(--muted)}
.fm-section-title{font-size:13px;font-weight:600;color:var(--muted);text-transform:uppercase;letter-spacing:.06em;margin:6px 0 10px}
.fm-list .fm-row{cursor:pointer}
.fm-list .fm-row.selected{background:#f5f6ff}
.fm-list .fm-row:hover{background:#fafbff}
.folder-ico{color:#f5b300}
.bulk-bar{position:sticky;top:76px;z-index:20;background:var(--text);color:#fff;border-radius:12px;padding:8px 14px;display:none;align-items:center;gap:8px;margin-bottom:14px;box-shadow:0 10px 30px rgba(0,0,0,.18)}
.bulk-bar.show{display:flex}
.bulk-bar .btn{color:#fff;border-color:rgba(255,255,255,.3)}
.dropzone{border:2px dashed #c7cbf0;border-radius:14px;padding:30px;text-align:center;background:#fafbff;cursor:pointer;transition:.15s}
.dropzone.drag{border-color:var(--brand);background:#eef0ff}
.dropzone i{font-size:40px;color:var(--brand)}
.drop-overlay{position:fixed;inset:0;background:rgba(79,70,229,.12);border:4px dashed var(--brand);z-index:2000;display:none;align-items:center;justify-content:center;font-size:24px;font-weight:700;color:var(--brand)}
.drop-overlay.show{display:flex}
.upload-item{font-size:13px;padding:6px 0;border-bottom:1px solid var(--border)}

/* permissions */
.perm-group{border:1px solid var(--border);border-radius:12px;padding:14px 16px;margin-bottom:14px;background:#fff}
.perm-group h6{font-weight:700;font-size:13.5px;display:flex;align-items:center;justify-content:space-between}
.perm-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:6px 18px}
.folder-tree{max-height:320px;overflow:auto;border:1px solid var(--border);border-radius:12px;padding:10px 14px;background:#fff}

/* sheet editor */
.sheet-wrap{overflow:auto;max-height:calc(100vh - 250px);border:1px solid var(--border);border-radius:10px;background:#fff}
.sheet{border-collapse:separate;border-spacing:0;font-size:13px}
.sheet th,.sheet td{border-right:1px solid #e3e5ee;border-bottom:1px solid #e3e5ee;min-width:110px;max-width:320px;height:30px;padding:0}
.sheet thead th{position:sticky;top:0;background:#f3f4f9;z-index:2;text-align:center;font-weight:600;color:#555;min-width:110px}
.sheet tbody th{position:sticky;left:0;background:#f3f4f9;z-index:1;min-width:46px;text-align:center;font-weight:600;color:#555}
.sheet thead th.corner{left:0;z-index:3;min-width:46px}
.sheet td div{padding:5px 8px;outline:none;white-space:pre;overflow:hidden;min-height:29px}
.sheet td div:focus{box-shadow:inset 0 0 0 2px var(--brand);background:#fbfbff;white-space:pre-wrap}
.sheet td.sel{background:#eef0ff}
.sheet-tabs .nav-link{border-radius:8px 8px 0 0;color:var(--muted);font-weight:500}
.sheet-tabs .nav-link.active{color:var(--brand);font-weight:700}

/* doc editor */
#docEditor{background:#fff;min-height:calc(100vh - 290px);font-size:15px}
.ql-toolbar.ql-snow{border-radius:12px 12px 0 0;background:#fafbfe;border-color:var(--border)!important}
.ql-container.ql-snow{border-radius:0 0 12px 12px;border-color:var(--border)!important}
.doc-page{max-width:900px;margin:0 auto}

/* auth */
.auth-wrap{min-height:100vh;display:grid;grid-template-columns:1.1fr 1fr}
.auth-hero{background:radial-gradient(circle at 20% 20%,#6d5df5 0,#3b2fb8 40%,#141640 100%);color:#fff;padding:60px;display:flex;flex-direction:column;justify-content:center}
.auth-hero h1{font-weight:700;font-size:36px}
.auth-hero .feat{display:flex;gap:12px;align-items:flex-start;margin-top:18px;opacity:.95}
.auth-hero .feat i{font-size:22px;background:rgba(255,255,255,.14);width:42px;height:42px;border-radius:12px;display:grid;place-items:center;flex-shrink:0}
.auth-form{display:flex;align-items:center;justify-content:center;padding:40px;background:#fff}
.auth-card{width:100%;max-width:400px}
@media(max-width:860px){.auth-wrap{grid-template-columns:1fr}.auth-hero{display:none}}

.preview-frame{width:100%;height:calc(100vh - 230px);border:1px solid var(--border);border-radius:12px;background:#fff}
.preview-img{max-width:100%;max-height:calc(100vh - 230px);border-radius:12px;display:block;margin:0 auto}
.kbd-hint{font-size:12px;color:var(--muted)}
.acc-card .progress{height:8px}
.step-list li{margin-bottom:8px}
code.copy{cursor:pointer;background:#f1f2f8;padding:4px 8px;border-radius:6px;color:#4338ca;word-break:break-all}

/* list view */
.list-mode .fm-grid{display:flex;flex-direction:column;gap:6px}
.list-mode .fm-item{display:flex;align-items:center;gap:14px;padding:9px 50px 9px 42px}
.list-mode .fm-item:hover{transform:none}
.list-mode .fm-item .fm-icon{font-size:26px;margin:0}
.list-mode .fm-item .fm-name{flex:1;min-width:0}
.list-mode .fm-item .fm-check{top:50%;transform:translateY(-50%);opacity:1}
.list-mode .fm-item .fm-menu{top:50%;transform:translateY(-50%)}
.list-mode .fm-item .fm-meta{min-width:170px;text-align:right}
@media(max-width:700px){.list-mode .fm-item .fm-meta{display:none}}
.fm-item.drop-target{border-color:#1e9e5a;background:#eafaf1;box-shadow:0 0 0 3px rgba(30,158,90,.25)}
.perm-matrix thead th,.perm-matrix th{font-size:12px;text-transform:none;letter-spacing:0;color:var(--text);font-weight:600;background:#fafbfe;vertical-align:bottom}
.perm-matrix td,.perm-matrix th{padding:.55rem .6rem}
.perm-matrix tbody tr:hover{background:#fafbff}
.perm-matrix .form-switch .form-check-input{width:2.4em;height:1.25em;margin:0;float:none}