:root{
  --green:#0f9d58;
  --green-dark:#0b8043;
  --bg:#f8f9fa;
  --panel:#ffffff;
  --border:#e0e0e0;
  --text:#3c4043;
  --text-muted:#5f6368;
  --hover:#f1f3f4;
  --radius:10px;
  --shadow:0 1px 2px 0 rgba(60,64,67,.3),0 1px 3px 1px rgba(60,64,67,.15);
}
*{box-sizing:border-box;}
html,body{width:100%;max-width:100%;overflow-x:hidden;}
body{margin:0;font-family:"Segoe UI",Roboto,Arial,sans-serif;color:var(--text);background:var(--bg);}
.hidden{display:none!important;}

.login-screen{position:fixed;inset:0;background:var(--bg);display:flex;align-items:center;justify-content:center;z-index:1000;padding:16px;}
.login-card{background:var(--panel);border:1px solid var(--border);border-radius:var(--radius);padding:32px;width:340px;max-width:100%;box-shadow:var(--shadow);}
.login-logo{font-size:22px;font-weight:600;margin-bottom:4px;}
.login-sub{color:var(--text-muted);font-size:13px;margin-bottom:20px;}
.login-card label{display:block;font-size:12px;color:var(--text-muted);margin-bottom:14px;}
.login-card input{width:100%;margin-top:4px;padding:9px 10px;border:1px solid var(--border);border-radius:6px;font-size:14px;}
.btn-primary{width:100%;background:var(--green);color:#fff;border:none;padding:10px;border-radius:6px;font-size:14px;font-weight:600;cursor:pointer;margin-top:6px;}
.btn-primary:hover{background:var(--green-dark);}
.login-error{color:#d93025;font-size:13px;margin-top:10px;}

.app{display:flex;width:100%;max-width:100%;height:100vh;overflow:hidden;}
.sidebar{width:270px;flex:0 0 270px;background:var(--panel);border-right:1px solid var(--border);display:flex;flex-direction:column;padding:16px 10px;overflow-y:auto;transition:transform .2s ease;}
.brand{display:flex;align-items:center;gap:8px;padding:8px 10px 18px;font-size:20px;font-weight:600;}
.add-new-wrap{position:relative;padding:0 8px 18px;}
.btn-add-new{display:flex;align-items:center;gap:8px;background:var(--panel);border:1px solid var(--border);box-shadow:var(--shadow);border-radius:24px;padding:10px 18px;font-size:14px;font-weight:600;cursor:pointer;color:var(--text);}
.btn-add-new .plus{color:var(--green);font-size:18px;font-weight:700;}
.btn-add-new:hover{background:var(--hover);}
.dropdown{position:absolute;top:48px;left:8px;background:var(--panel);border:1px solid var(--border);border-radius:8px;box-shadow:var(--shadow);z-index:20;overflow:hidden;min-width:200px;}
.dropdown button{display:block;width:100%;text-align:left;padding:10px 14px;border:none;background:none;cursor:pointer;font-size:13px;color:var(--text);}
.dropdown button:hover{background:var(--hover);}

.sidebar-section-title{font-size:11px;text-transform:uppercase;letter-spacing:.04em;color:var(--text-muted);padding:14px 14px 6px;}

.folder-tree{display:flex;flex-direction:column;font-size:13px;}
.tree-row{display:flex;align-items:center;gap:6px;padding:6px 8px;border-radius:0 20px 20px 0;cursor:pointer;white-space:nowrap;overflow:hidden;}
.tree-row:hover{background:var(--hover);}
.tree-row.active{background:#e6f4ea;color:var(--green-dark);font-weight:600;}
.tree-row .caret{width:14px;flex:0 0 14px;text-align:center;font-size:10px;color:var(--text-muted);cursor:pointer;transition:transform .12s;}
.tree-row .caret.open{transform:rotate(90deg);}
.tree-row .tname{overflow:hidden;text-overflow:ellipsis;}
.tree-children{display:flex;flex-direction:column;}

.nav{display:flex;flex-direction:column;gap:2px;}
.nav-item{display:flex;align-items:center;gap:14px;padding:9px 14px;border-radius:0 20px 20px 0;border:none;background:none;text-align:left;font-size:13px;color:var(--text);cursor:pointer;width:100%;}
.nav-item .ic{width:18px;text-align:center;}
.nav-item:hover{background:var(--hover);}
.saved-folders{flex:0 0 auto;max-height:140px;overflow-y:auto;}
.saved-folders .nav-item{font-size:12.5px;}
.saved-folders .remove-pin{margin-left:auto;opacity:.5;}
.saved-folders .remove-pin:hover{opacity:1;}

.storage-box{margin-top:auto;padding:14px;}
.storage-bar{height:5px;background:var(--border);border-radius:3px;overflow:hidden;margin-bottom:6px;}
.storage-fill{height:100%;background:var(--green);width:0%;}
.storage-text{font-size:11.5px;color:var(--text-muted);}
.btn-link{background:none;border:none;color:var(--green-dark);font-size:12px;cursor:pointer;padding:6px 0;text-decoration:none;}

.main{flex:1;display:flex;flex-direction:column;min-width:0;max-width:100%;position:relative;}
.topbar{display:flex;align-items:center;gap:14px;min-width:0;padding:12px 24px;border-bottom:1px solid var(--border);background:var(--panel);}
.btn-hamburger{display:none;background:none;border:none;font-size:20px;width:36px;height:36px;border-radius:50%;cursor:pointer;color:var(--text);flex:0 0 36px;}
.btn-hamburger:hover{background:var(--hover);}
.search-wrap{flex:1;max-width:720px;display:flex;align-items:center;background:var(--hover);border-radius:24px;padding:8px 16px;gap:10px;min-width:0;}
.search-wrap input{border:none;background:none;outline:none;flex:1;font-size:14px;min-width:0;}
.topbar-actions{display:flex;align-items:center;gap:6px;flex:0 0 auto;}
.icon-btn{background:none;border:none;font-size:16px;width:36px;height:36px;border-radius:50%;cursor:pointer;color:var(--text-muted);flex:0 0 36px;}
.icon-btn:hover{background:var(--hover);}
.icon-btn.active{color:var(--green-dark);background:#e6f4ea;}
.avatar{width:32px;height:32px;border-radius:50%;background:#ddd;display:flex;align-items:center;justify-content:center;margin-left:6px;font-size:15px;flex:0 0 32px;}

.content{flex:1;min-width:0;max-width:100%;overflow-x:hidden;overflow-y:auto;padding:18px 28px 60px;}
.content-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:14px;flex-wrap:wrap;gap:8px;}
.breadcrumb{display:flex;align-items:center;gap:6px;max-width:100%;font-size:18px;flex-wrap:wrap;min-width:0;}
.breadcrumb button{background:none;border:none;font-size:18px;color:var(--text);cursor:pointer;padding:4px 6px;border-radius:6px;max-width:100%;overflow:hidden;text-overflow:ellipsis;}
.breadcrumb button:hover{background:var(--hover);}
.breadcrumb span.sep{color:var(--text-muted);}
.breadcrumb button.current{font-weight:600;}
.content-actions{display:flex;gap:8px;flex-wrap:wrap;}
.btn-ghost{background:none;border:1px solid var(--border);border-radius:18px;padding:7px 14px;font-size:12.5px;cursor:pointer;color:var(--text);white-space:nowrap;}
.btn-ghost:hover{background:var(--hover);}
.btn-ghost.danger{color:#d93025;border-color:#f2c1bd;}

.section-title-row{display:flex;align-items:center;justify-content:between;margin:18px 0 10px;}
.section-title-row h3{font-size:14px;color:var(--text-muted);font-weight:600;margin:0;}

.quick-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(min(220px,100%),1fr));gap:14px;margin-bottom:6px;}
.quick-card{display:flex;align-items:center;gap:12px;min-width:0;background:var(--panel);border:1px solid var(--border);border-radius:8px;padding:12px;cursor:pointer;}
.quick-card:hover{box-shadow:var(--shadow);}
.quick-card .thumb{width:38px;height:38px;border-radius:4px;object-fit:cover;background:var(--hover);display:flex;align-items:center;justify-content:center;font-size:18px;flex:0 0 38px;overflow:hidden;}
.quick-card .meta{overflow:hidden;}
.quick-card .name{font-size:13px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;}
.quick-card .sub{font-size:11px;color:var(--text-muted);}

.file-view.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(min(160px,100%),1fr));gap:14px;}
.file-view.grid .file-card .thumb-wrap{height:96px;font-size:34px;}

.file-view.thumbs{display:grid;grid-template-columns:repeat(auto-fill,minmax(min(190px,100%),1fr));gap:16px;}
.file-view.thumbs .file-card .thumb-wrap{height:170px;font-size:52px;}
.file-view.thumbs .file-card .fname{font-size:13px;}

.file-card{position:relative;min-width:0;background:var(--panel);border:1px solid var(--border);border-radius:8px;padding:10px;cursor:pointer;user-select:none;}
.file-card:hover{box-shadow:var(--shadow);}
.file-card.selected{outline:2px solid var(--green);background:#e6f4ea;}
.file-card .thumb-wrap{border-radius:6px;background:var(--hover);display:flex;align-items:center;justify-content:center;overflow:hidden;margin-bottom:8px;}
.file-card .thumb-wrap img{width:100%;height:100%;object-fit:cover;}
.ui-icon{display:block;width:1.35em;height:1.35em;}
.folder-icon{color:#f6b93b;filter:drop-shadow(0 1px 1px rgba(0,0,0,.12));}
.file-type-icon{color:#5f6368;}
.file-type-icon.icon-pdf{color:#d93025;}
.file-type-icon.icon-image{color:#a142f4;}
.file-type-icon.icon-video{color:#e8710a;}
.file-type-icon.icon-audio{color:#1a73e8;}
.file-type-icon.icon-spreadsheet{color:#188038;}
.file-type-icon.icon-presentation{color:#f9ab00;}
.file-type-icon.icon-archive{color:#795548;}
.file-type-icon.icon-code{color:#546e7a;}
.thumb-wrap .file-type-icon{width:1.45em;height:1.45em;}
.ric .file-type-icon{color:#5f6368;}
.thumb-wrap .folder-icon{width:1.6em;height:1.6em;}
.file-card .fname{font-size:12.5px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;}
.file-card .fsub{font-size:11px;color:var(--text-muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;}
.file-card .pin-badge{position:absolute;top:8px;right:8px;font-size:12px;}
.file-card .play-badge{position:absolute;top:18px;right:18px;color:rgba(32,33,36,.78);font-size:22px;filter:drop-shadow(0 1px 2px rgba(0,0,0,.45));pointer-events:none;}

.file-view.list{display:flex;flex-direction:column;border-top:1px solid var(--border);}
.file-row{display:flex;align-items:center;gap:14px;padding:9px 6px;border-bottom:1px solid var(--border);cursor:pointer;user-select:none;}
.file-row:hover{background:var(--hover);}
.file-row.selected{background:#e6f4ea;}
.file-row .ric{width:22px;text-align:center;font-size:16px;flex:0 0 22px;}
.file-row .rname{flex:2;min-width:0;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;font-size:13px;}
.file-row .rdate{flex:1;font-size:12px;color:var(--text-muted);}
.file-row .rsize{width:80px;font-size:12px;color:var(--text-muted);text-align:right;}

.empty-msg{color:var(--text-muted);font-size:13px;padding:30px 0;text-align:center;}

.drag-overlay{position:absolute;inset:0;background:rgba(15,157,88,.08);border:3px dashed var(--green);display:flex;align-items:center;justify-content:center;font-size:18px;font-weight:600;color:var(--green-dark);z-index:30;pointer-events:none;}
.hidden-input{display:none;}

.ctx-menu{position:fixed;background:var(--panel);border:1px solid var(--border);border-radius:8px;box-shadow:var(--shadow);z-index:100;min-width:170px;overflow:hidden;}
.ctx-menu button{display:block;width:100%;text-align:left;background:none;border:none;padding:9px 14px;font-size:13px;cursor:pointer;color:var(--text);}
.ctx-menu button:hover{background:var(--hover);}
.ctx-menu button.danger{color:#d93025;}

.toast{position:fixed;bottom:24px;left:50%;transform:translateX(-50%);background:#323232;color:#fff;padding:10px 20px;border-radius:6px;font-size:13px;z-index:200;box-shadow:var(--shadow);max-width:90vw;}

.media-modal{position:fixed;inset:0;background:rgba(0,0,0,.92);z-index:500;display:flex;flex-direction:column;}
.media-modal-bar{display:flex;align-items:center;justify-content:space-between;padding:12px 20px;color:#fff;}
.media-modal-name{font-size:14px;opacity:.85;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;max-width:70vw;}
.media-modal-actions{display:flex;gap:10px;}
.media-modal-actions button{background:rgba(255,255,255,.12);border:none;color:#fff;width:36px;height:36px;border-radius:50%;cursor:pointer;font-size:15px;}
.media-modal-actions button:hover{background:rgba(255,255,255,.22);}
.media-modal-body{flex:1;display:flex;align-items:center;justify-content:center;overflow:hidden;padding:0 20px 20px;}
.media-modal-body video{max-width:100%;max-height:100%;}
.media-modal-body audio{width:min(600px,90vw);}
.media-modal-body img{max-width:100%;max-height:100%;object-fit:contain;}

.upload-panel{position:fixed;bottom:20px;right:20px;width:340px;max-width:calc(100vw - 32px);max-height:360px;background:var(--panel);border:1px solid var(--border);border-radius:10px;box-shadow:var(--shadow);z-index:400;display:flex;flex-direction:column;overflow:hidden;}
.upload-panel-head{display:flex;align-items:center;justify-content:space-between;padding:10px 14px;background:#202124;color:#fff;font-size:13px;}
.upload-panel-head button{background:none;border:none;color:#fff;cursor:pointer;font-size:13px;}
.upload-panel-list{overflow-y:auto;padding:8px;}
.upload-row{padding:8px 6px;border-bottom:1px solid var(--border);}
.upload-row:last-child{border-bottom:none;}
.upload-row .u-name{font-size:12px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;margin-bottom:5px;}
.upload-row .u-bar{height:4px;background:var(--border);border-radius:3px;overflow:hidden;}
.upload-row .u-fill{height:100%;background:var(--green);width:0%;transition:width .15s;}
.upload-row.done .u-fill{background:var(--green);width:100%;}
.upload-row.error .u-fill{background:#d93025;width:100%;}
.upload-row .u-status{font-size:10.5px;color:var(--text-muted);margin-top:3px;}

@media (max-width: 1100px){
  .sidebar{width:230px;flex:0 0 230px;}
  .content{padding:16px 18px 60px;}
}

@media (max-width: 900px){
  .btn-hamburger{display:flex;align-items:center;justify-content:center;}
  .sidebar{position:fixed;top:0;left:0;bottom:0;z-index:600;transform:translateX(-100%);box-shadow:2px 0 12px rgba(0,0,0,.25);}
  .app.sidebar-open .sidebar{transform:translateX(0);}
  .sidebar-backdrop{position:fixed;inset:0;background:rgba(0,0,0,.4);z-index:590;opacity:0;pointer-events:none;transition:opacity .2s;}
  .app.sidebar-open .sidebar-backdrop{opacity:1;pointer-events:auto;}
  .main{width:100%;}
  .topbar{padding:10px 14px;gap:10px;}
  .avatar{display:none;}
}

@media (max-width: 640px){
  .content{padding:12px 12px 60px;}
  .content-head{flex-direction:column;align-items:flex-start;}
  .content-actions{width:100%;}
  .btn-ghost{flex:1;text-align:center;}
  .quick-grid{grid-template-columns:repeat(2,minmax(0,1fr));}
  .quick-card .name{font-size:12px;}
  .file-view.grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:10px;}
  .file-view.thumbs{grid-template-columns:repeat(2,minmax(0,1fr));gap:10px;}
  .file-view.thumbs .file-card .thumb-wrap{height:130px;}
  .file-row .rdate{display:none;}
  .file-row .rsize{width:60px;}
  .breadcrumb{font-size:15px;}
  .breadcrumb button{font-size:15px;}
  .upload-panel{left:16px;right:16px;width:auto;bottom:16px;}
  .media-modal-name{max-width:55vw;font-size:12px;}
  .media-modal-actions button{width:32px;height:32px;font-size:13px;}
  .login-card{padding:24px;}
}

@media (max-width: 380px){
  .file-view.grid{grid-template-columns:repeat(2,minmax(0,1fr));}
  .search-wrap{padding:6px 12px;}
}