*{margin:0;padding:0;box-sizing:border-box}
:root{
  --bg:#0f1117;--surface:#1c1f26;--surface2:#252932;
  --border:#2d3748;--accent:#4285F4;--accent-hover:#3370d4;
  --text:#e2e8f0;--text2:#94a3b8;--text3:#64748b;
  --danger:#ea4335;--success:#34a853;--warning:#fbbc04;
  --sidebar-w:240px;--header-h:64px;
}
body{font-family:'Inter',sans-serif;background:var(--bg);color:var(--text);height:100vh;display:flex;overflow:hidden}

/* ---- SIDEBAR ---- */
#sidebar{width:var(--sidebar-w);min-width:var(--sidebar-w);background:var(--bg);display:flex;flex-direction:column;padding:12px 8px;border-right:1px solid var(--border);height:100vh;overflow:hidden}
.sidebar-top{padding:4px 8px 16px}
.logo{display:flex;align-items:center;gap:10px;padding:8px 4px 16px;cursor:default}
.logo-icon{width:36px;height:36px;background:linear-gradient(135deg,#4285F4,#34a853);border-radius:10px;display:flex;align-items:center;justify-content:center;flex-shrink:0}
.logo span{font-size:18px;font-weight:700;letter-spacing:-.4px}
.new-wrap{position:relative}
.new-btn{display:flex;align-items:center;gap:8px;padding:10px 20px 10px 16px;background:var(--surface);border:1px solid var(--border);border-radius:100px;color:var(--text);font-family:'Inter',sans-serif;font-size:14px;font-weight:500;cursor:pointer;transition:background .15s,box-shadow .15s;width:100%}
.new-btn:hover{background:var(--surface2);box-shadow:0 2px 12px rgba(0,0,0,.3)}

/* sidebar nav */
.sidebar-nav{flex:1;overflow-y:auto;padding:4px 0}
.sidebar-nav::-webkit-scrollbar{width:4px}
.sidebar-nav::-webkit-scrollbar-thumb{background:var(--border);border-radius:4px}
.nav-item{display:flex;align-items:center;gap:12px;padding:10px 12px;border-radius:100px;color:var(--text2);text-decoration:none;font-size:14px;font-weight:500;cursor:pointer;transition:background .12s,color .12s;white-space:nowrap}
.nav-item:hover{background:var(--surface2);color:var(--text)}
.nav-item.active{background:#1e3a5f;color:var(--accent)}

/* storage */
.storage-box{padding:12px 8px 8px;border-top:1px solid var(--border);margin-top:8px}
.storage-bar-wrap{background:var(--surface2);border-radius:4px;height:4px;margin-bottom:8px;overflow:hidden}
.storage-bar-fill{height:100%;background:var(--accent);border-radius:4px;transition:width .5s ease;max-width:100%}
.storage-bar-fill.warn{background:var(--warning)}
.storage-bar-fill.danger{background:var(--danger)}
.storage-text{font-size:12px;color:var(--text3);margin-bottom:6px}
.storage-manage{background:none;border:none;color:var(--accent);font-size:12px;font-family:'Inter',sans-serif;cursor:pointer;padding:4px 0}

/* ---- MAIN ---- */
#mainWrap{flex:1;display:flex;flex-direction:column;overflow:hidden}

/* header */
#header{height:var(--header-h);display:flex;align-items:center;padding:0 20px;gap:12px;border-bottom:1px solid var(--border);flex-shrink:0}
.search-box{flex:1;max-width:680px;display:flex;align-items:center;gap:10px;background:var(--surface2);border:1.5px solid transparent;border-radius:100px;padding:10px 16px;transition:border-color .2s,background .2s}
.search-box:focus-within{background:var(--surface);border-color:var(--accent)}
.search-box input{flex:1;background:none;border:none;color:var(--text);font-size:15px;font-family:'Inter',sans-serif;outline:none}
.search-box input::placeholder{color:var(--text3)}
.search-type-wrap select{background:none;border:none;color:var(--text3);font-size:13px;font-family:'Inter',sans-serif;cursor:pointer;outline:none}
.search-type-wrap select option{background:var(--surface2);color:var(--text)}
.header-right{display:flex;align-items:center;gap:8px;margin-left:auto}
.icon-btn{background:none;border:none;color:var(--text2);cursor:pointer;padding:8px;border-radius:8px;display:flex;align-items:center;gap:4px;font-size:14px;transition:background .12s,color .12s}
.icon-btn:hover{background:var(--surface2);color:var(--text)}
.user-btn{width:36px;height:36px;border-radius:50%;background:linear-gradient(135deg,#4285F4,#34a853);display:flex;align-items:center;justify-content:center;cursor:pointer;font-weight:700;font-size:15px;color:white;position:relative}

/* content */
#content{flex:1;display:flex;flex-direction:column;overflow:hidden}
#toolbar{display:flex;align-items:center;padding:12px 20px;gap:12px;flex-shrink:0}
#breadcrumb{display:flex;align-items:center;gap:4px;flex:1;flex-wrap:wrap}
.bc-item{font-size:15px;color:var(--text2);cursor:pointer;padding:4px 6px;border-radius:6px;transition:background .12s}
.bc-item:hover{background:var(--surface2);color:var(--text)}
.bc-item.active{color:var(--text);font-weight:600;cursor:default}
.bc-item.active:hover{background:none}
.bc-sep{color:var(--text3);font-size:13px}
.toolbar-right{display:flex;align-items:center;gap:8px}
.sort-wrap{position:relative}
.sort-btn{font-size:13px;padding:6px 10px}

/* bulk bar */
#bulkBar{display:flex;align-items:center;gap:10px;padding:8px 20px;background:var(--surface);border-bottom:1px solid var(--border);flex-shrink:0}
#bulkBar.hidden{display:none}
#selCount{font-size:14px;color:var(--text2);flex:1}
.bulk-btn{padding:7px 14px;border:1px solid var(--border);border-radius:8px;background:var(--surface2);color:var(--text);font-size:13px;font-family:'Inter',sans-serif;cursor:pointer;transition:background .12s}
.bulk-btn:hover{background:var(--border)}
.bulk-btn.danger{border-color:rgba(234,67,53,.4);color:var(--danger)}
.bulk-btn.danger:hover{background:rgba(234,67,53,.1)}

/* drop zone */
#dropZone{flex:1;overflow-y:auto;padding:8px 20px 20px;position:relative}
#dropZone::-webkit-scrollbar{width:6px}
#dropZone::-webkit-scrollbar-thumb{background:var(--border);border-radius:4px}
#dropZone.drag-over #dropOverlay{display:flex}
#dropOverlay{position:absolute;inset:0;background:rgba(66,133,244,.08);border:2px dashed var(--accent);border-radius:12px;display:none;align-items:center;justify-content:center;z-index:10;pointer-events:none}
.drop-msg{font-size:22px;font-weight:600;color:var(--accent)}

/* section titles */
.section-title{font-size:13px;font-weight:600;color:var(--text3);padding:8px 4px 4px;text-transform:uppercase;letter-spacing:.5px}

/* GRID view */
#fileArea.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:8px}
.grid-item{background:var(--surface);border:1.5px solid var(--border);border-radius:12px;overflow:hidden;cursor:pointer;transition:border-color .15s,transform .12s,box-shadow .12s;position:relative;user-select:none}
.grid-item:hover{border-color:#4a5568;transform:translateY(-1px);box-shadow:0 6px 20px rgba(0,0,0,.3)}
.grid-item.selected{border-color:var(--accent);background:#1e3a5f}
.grid-item .item-thumb{height:110px;display:flex;align-items:center;justify-content:center;background:var(--surface2);overflow:hidden}
.grid-item .item-thumb img{width:100%;height:100%;object-fit:cover}
.grid-item .item-thumb .file-icon-big{font-size:44px}
.grid-item .item-info{padding:10px 10px 8px}
.grid-item .item-name{font-size:13px;font-weight:500;color:var(--text);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.grid-item .item-meta{font-size:11px;color:var(--text3);margin-top:3px}
.grid-item .item-check{position:absolute;top:8px;left:8px;opacity:0;transition:opacity .12s}
.grid-item:hover .item-check,.grid-item.selected .item-check{opacity:1}
.grid-item .item-star{position:absolute;top:8px;right:8px;background:none;border:none;cursor:pointer;color:var(--text3);font-size:16px;opacity:0;transition:opacity .12s}
.grid-item:hover .item-star,.grid-item.starred .item-star{opacity:1}
.grid-item.starred .item-star{color:var(--warning)}

/* LIST view */
#fileArea.list{display:flex;flex-direction:column;gap:1px}
.list-header{display:grid;grid-template-columns:36px 1fr 140px 100px 80px;gap:8px;padding:8px 12px;font-size:12px;font-weight:600;color:var(--text3);border-bottom:1px solid var(--border)}
.list-item{display:grid;grid-template-columns:36px 1fr 140px 100px 80px;gap:8px;align-items:center;padding:8px 12px;border-radius:8px;cursor:pointer;transition:background .1s;user-select:none}
.list-item:hover{background:var(--surface)}
.list-item.selected{background:#1e3a5f}
.list-item .item-name-col{display:flex;align-items:center;gap:10px;min-width:0}
.list-item .item-name-col span{white-space:nowrap;overflow:hidden;text-overflow:ellipsis;font-size:14px}
.list-item .file-icon{font-size:22px;flex-shrink:0}
.list-item .meta-col{font-size:13px;color:var(--text3)}
.list-item .actions-col{display:flex;align-items:center;gap:4px;opacity:0;transition:opacity .12s}
.list-item:hover .actions-col{opacity:1}
.list-star{background:none;border:none;cursor:pointer;color:var(--text3);font-size:16px;padding:2px 4px}
.list-star.starred{color:var(--warning)}

/* Empty state */
#emptyState{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:16px;padding:80px 20px;text-align:center}
#emptyState.hidden{display:none}
#emptyState h3{font-size:18px;color:var(--text2)}
#emptyState p{font-size:14px;color:var(--text3)}

/* ---- DROPDOWN ---- */
.dropdown{position:absolute;background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:6px;min-width:200px;box-shadow:0 12px 40px rgba(0,0,0,.5);z-index:1000;opacity:0;transform:translateY(-8px) scale(.97);pointer-events:none;transition:opacity .15s,transform .15s}
.dropdown.open{opacity:1;transform:none;pointer-events:all}
.dd-item{padding:9px 12px;border-radius:8px;font-size:14px;cursor:pointer;display:flex;align-items:center;gap:10px;transition:background .1s;color:var(--text)}
.dd-item:hover{background:var(--surface2)}
.dd-divider{height:1px;background:var(--border);margin:4px 0}
.dd-user-info{padding:8px 12px;display:flex;flex-direction:column;gap:2px}
.dd-user-info strong{font-size:14px;color:var(--text)}
.dd-user-info span{font-size:12px;color:var(--text3)}
#newMenu{top:calc(100% + 6px);left:0;min-width:220px}
#userMenu{top:calc(100% + 6px);right:0;min-width:200px}
#sortMenu{top:calc(100% + 4px);right:0;min-width:160px}

/* ---- CONTEXT MENU ---- */
.ctx-menu{position:fixed;background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:6px;min-width:200px;box-shadow:0 12px 40px rgba(0,0,0,.6);z-index:2000}
.ctx-item{padding:9px 14px;border-radius:8px;font-size:14px;cursor:pointer;transition:background .1s;color:var(--text)}
.ctx-item:hover{background:var(--surface2)}
.ctx-danger{color:var(--danger)}
.ctx-divider{height:1px;background:var(--border);margin:4px 0}

/* ---- MODALS ---- */
.modal-overlay{position:fixed;inset:0;background:rgba(0,0,0,.7);display:flex;align-items:center;justify-content:center;z-index:3000;backdrop-filter:blur(4px)}
.modal-overlay.hidden{display:none}
.dialog{background:var(--surface);border:1px solid var(--border);border-radius:16px;padding:28px;min-width:360px;box-shadow:0 24px 80px rgba(0,0,0,.6)}
.dialog h3{font-size:18px;font-weight:600;margin-bottom:16px}
.dialog-sub{font-size:14px;color:var(--text2);margin-bottom:16px;margin-top:-8px}
.dialog-input{width:100%;padding:11px 14px;background:var(--surface2);border:1.5px solid var(--border);border-radius:10px;color:var(--text);font-size:15px;font-family:'Inter',sans-serif;outline:none;transition:border-color .2s}
.dialog-input:focus{border-color:var(--accent)}
.dialog-actions{display:flex;justify-content:flex-end;gap:10px;margin-top:20px}
.share-link-box{display:flex;gap:8px;margin-bottom:14px}
.share-options{display:flex;align-items:center;gap:10px;flex-wrap:wrap}
.share-options label{font-size:13px;color:var(--text3)}
.share-options input{width:80px}
.btn-primary{padding:9px 18px;background:var(--accent);border:none;border-radius:8px;color:white;font-size:14px;font-weight:500;font-family:'Inter',sans-serif;cursor:pointer;transition:background .12s}
.btn-primary:hover{background:var(--accent-hover)}
.btn-secondary{padding:9px 18px;background:var(--surface2);border:1px solid var(--border);border-radius:8px;color:var(--text);font-size:14px;font-family:'Inter',sans-serif;cursor:pointer;transition:background .12s}
.btn-secondary:hover{background:var(--border)}
.btn-danger{padding:9px 18px;background:rgba(234,67,53,.15);border:1px solid rgba(234,67,53,.3);border-radius:8px;color:var(--danger);font-size:14px;font-family:'Inter',sans-serif;cursor:pointer}
.btn-danger:hover{background:rgba(234,67,53,.25)}

/* Preview modal */
.preview-modal{background:var(--surface);border:1px solid var(--border);border-radius:16px;width:90vw;max-width:1000px;max-height:90vh;display:flex;flex-direction:column;overflow:hidden}
.preview-header{display:flex;align-items:center;justify-content:space-between;padding:16px 20px;border-bottom:1px solid var(--border);gap:12px}
.preview-header span{font-size:15px;font-weight:500;flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.preview-actions{display:flex;align-items:center;gap:8px}
.preview-body{flex:1;overflow:auto;display:flex;align-items:center;justify-content:center;padding:16px;min-height:300px;background:var(--bg)}
.preview-body img{max-width:100%;max-height:70vh;object-fit:contain;border-radius:8px}
.preview-body video,.preview-body audio{width:100%;max-height:70vh}
.preview-body iframe{width:100%;height:70vh;border:none}
.preview-body pre{background:var(--surface2);padding:20px;border-radius:8px;font-size:13px;font-family:monospace;white-space:pre-wrap;max-width:100%;overflow:auto;color:var(--text)}
.preview-no-support{text-align:center;color:var(--text3)}
.preview-no-support p{margin-bottom:12px}

/* Folder tree */
.folder-tree{max-height:260px;overflow-y:auto;border:1px solid var(--border);border-radius:10px;padding:8px;margin-bottom:4px}
.tree-item{padding:8px 10px;border-radius:8px;cursor:pointer;font-size:14px;transition:background .1s;display:flex;align-items:center;gap:8px}
.tree-item:hover{background:var(--surface2)}
.tree-item.selected-folder{background:#1e3a5f;color:var(--accent)}
.tree-children{padding-left:16px}

/* Trash actions */
.trash-actions{display:flex;justify-content:flex-end;padding:0 20px 8px}
.trash-restore,.trash-perm{padding:6px 12px;border-radius:8px;font-size:12px;font-family:'Inter',sans-serif;cursor:pointer;border:1px solid var(--border);background:var(--surface2);color:var(--text)}
.trash-perm{border-color:rgba(234,67,53,.3);color:var(--danger)}

/* Upload panel */
.upload-panel{position:fixed;bottom:20px;right:20px;width:340px;background:var(--surface);border:1px solid var(--border);border-radius:14px;box-shadow:0 12px 40px rgba(0,0,0,.5);z-index:2500;overflow:hidden}
.upload-panel.hidden{display:none}
.upload-panel-header{display:flex;align-items:center;justify-content:space-between;padding:12px 16px;background:var(--surface2);font-size:14px;font-weight:500}
.upload-list{max-height:240px;overflow-y:auto;padding:8px}
.upload-item{padding:8px 8px;display:flex;flex-direction:column;gap:4px;border-radius:8px}
.upload-item-name{font-size:13px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.upload-progress{height:3px;background:var(--surface2);border-radius:2px;overflow:hidden}
.upload-progress-bar{height:100%;background:var(--accent);transition:width .3s;border-radius:2px}
.upload-item-status{font-size:11px;color:var(--text3)}

/* Toast */
.toast{position:fixed;bottom:80px;left:50%;transform:translateX(-50%);background:#1c1f26;border:1px solid var(--border);border-radius:10px;padding:12px 20px;font-size:14px;color:var(--text);box-shadow:0 8px 30px rgba(0,0,0,.4);z-index:5000;transition:opacity .3s;white-space:nowrap}
.toast.hidden{opacity:0;pointer-events:none}
.toast.success{border-color:rgba(52,168,83,.5);color:var(--success)}
.toast.error{border-color:rgba(234,67,53,.5);color:var(--danger)}

/* checkbox */
input[type=checkbox]{width:16px;height:16px;accent-color:var(--accent);cursor:pointer}

/* Color dot for folders */
.folder-color-dot{width:8px;height:8px;border-radius:50%;display:inline-block;margin-right:2px}

/* Scrollbars */
::-webkit-scrollbar{width:6px;height:6px}
::-webkit-scrollbar-track{background:transparent}
::-webkit-scrollbar-thumb{background:var(--border);border-radius:4px}

/* Utility classes */
.hidden { display: none !important; }