:root {
  --bg-color: #121212;
  --sidebar-bg: #1e1e1e;
  --card-bg: #242424;
  --card-hover: #2d2d2d;
  --card-selected: #1e3a5f;
  --border-color: #333333;
  --border-selected: #38bdf8;
  --text-main: #f0f0f0;
  --text-muted: #a0a0a0;
  --accent-color: #38bdf8;
  --accent-hover: #0284c7;
  --danger-color: #ef4444;
  --danger-hover: #dc2626;
  --success-color: #22c55e;
  --star-color: #f59e0b;
  --folder-color: #fbbf24;
  --topbar-height: 64px;
  --sidebar-width: 260px;
}

* { box-sizing: border-box; margin: 0; padding: 0; font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif; }
body { background-color: var(--bg-color); color: var(--text-main); height: 100vh; overflow: hidden; display: flex; }

/* Zero-Flash Paint Protection */
body.loading main,
body.loading aside {
  visibility: hidden;
}
body.loading {
  overflow: hidden;
}

/* AUTH OVERLAYS */
.auth-overlay { position: fixed; inset: 0; background: var(--bg-color); z-index: 2000; display: flex; align-items: center; justify-content: center; }
.auth-card { background: var(--sidebar-bg); border: 1px solid var(--border-color); border-radius: 1rem; padding: 2.5rem; width: 100%; max-width: 420px; display: flex; flex-direction: column; gap: 1.25rem; }
.auth-title { font-size: 1.35rem; font-weight: 700; color: var(--accent-color); text-align: center; display: flex; align-items: center; justify-content: center; gap: 0.5rem; }
.auth-subtitle { font-size: 0.85rem; color: var(--text-muted); text-align: center; margin-top: -0.5rem; line-height: 1.4; }

/* SIDEBAR */
aside { width: var(--sidebar-width); background-color: var(--sidebar-bg); border-right: 1px solid var(--border-color); display: flex; flex-direction: column; padding: 1.25rem 1rem; flex-shrink: 0; }
.brand { display: flex; align-items: center; gap: 0.75rem; font-size: 1.25rem; font-weight: 700; color: var(--accent-color); margin-bottom: 1.5rem; padding-left: 0.5rem; }
.btn-new-group { display: flex; gap: 0.5rem; margin-bottom: 1.5rem; }
.btn-new { flex: 1; background: linear-gradient(135deg, var(--accent-color), var(--accent-hover)); color: #121212; font-weight: 600; border: none; border-radius: 0.75rem; padding: 0.75rem; display: flex; align-items: center; justify-content: center; gap: 0.35rem; cursor: pointer; font-size: 0.85rem; transition: all 0.2s ease; }
.btn-new:hover { transform: translateY(-1px); }
.btn-secondary-sidebar { background: var(--card-bg); color: var(--text-main); border: 1px solid var(--border-color); border-radius: 0.75rem; padding: 0.75rem; cursor: pointer; display: flex; align-items: center; justify-content: center; }
.btn-secondary-sidebar:hover { background: var(--card-hover); }

.nav-menu { list-style: none; display: flex; flex-direction: column; gap: 0.25rem; flex: 1; }
.nav-item { display: flex; align-items: center; gap: 0.75rem; padding: 0.75rem 1rem; border-radius: 0.5rem; color: var(--text-muted); font-size: 0.9rem; font-weight: 500; cursor: pointer; transition: all 0.15s ease; user-select: none; }
.nav-item:hover, .nav-item.active { background-color: var(--card-hover); color: var(--text-main); }
.nav-item.active { color: var(--accent-color); }

.storage-widget { background-color: var(--card-bg); border: 1px solid var(--border-color); border-radius: 0.75rem; padding: 1rem; }
.storage-title { font-size: 0.8rem; color: var(--text-muted); margin-bottom: 0.5rem; display: flex; justify-content: space-between; }
.progress-bar { height: 6px; background-color: var(--border-color); border-radius: 3px; overflow: hidden; margin-bottom: 0.5rem; }
.progress-fill { width: 0%; height: 100%; background-color: var(--accent-color); transition: width 0.3s ease; }
.storage-info { font-size: 0.75rem; color: var(--text-muted); }

/* MAIN WORKSPACE */
main { flex: 1; display: flex; flex-direction: column; height: 100vh; overflow: hidden; position: relative; }
header { height: var(--topbar-height); background-color: var(--bg-color); border-bottom: 1px solid var(--border-color); display: flex; align-items: center; justify-content: space-between; padding: 0 2rem; gap: 1.5rem; }
.search-box { flex: 1; max-width: 600px; position: relative; }
.search-box input { width: 100%; background-color: var(--sidebar-bg); border: 1px solid var(--border-color); border-radius: 0.75rem; padding: 0.6rem 1rem 0.6rem 2.75rem; color: var(--text-main); font-size: 0.9rem; outline: none; }
.search-box input:focus { border-color: var(--accent-color); }
.search-icon { position: absolute; left: 1rem; top: 50%; transform: translateY(-50%); color: var(--text-muted); pointer-events: none; }
.user-profile { display: flex; align-items: center; gap: 1rem; position: relative; }
.status-badge { font-size: 0.75rem; background-color: rgba(56, 189, 248, 0.1); color: var(--accent-color); padding: 0.25rem 0.6rem; border-radius: 1rem; border: 1px solid rgba(56, 189, 248, 0.2); }
.avatar { width: 36px; height: 36px; border-radius: 50%; background-color: var(--accent-color); color: #121212; display: flex; align-items: center; justify-content: center; font-weight: 700; font-size: 0.85rem; cursor: pointer; user-select: none; }

.workspace { flex: 1; padding: 1.5rem 2rem; overflow-y: auto; display: flex; flex-direction: column; gap: 1.5rem; background-color: var(--bg-color); position: relative; user-select: none; }
.toolbar { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 1rem; }
.breadcrumbs { display: flex; align-items: center; gap: 0.5rem; font-size: 1.1rem; font-weight: 600; }
.breadcrumb-item { color: var(--text-muted); cursor: pointer; }
.breadcrumb-item:hover, .breadcrumb-item.active { color: var(--text-main); }
.toolbar-actions { display: flex; align-items: center; gap: 0.75rem; }
.select-dropdown { background-color: var(--sidebar-bg); border: 1px solid var(--border-color); color: var(--text-main); border-radius: 0.5rem; padding: 0.4rem 0.75rem; font-size: 0.85rem; outline: none; cursor: pointer; }
.selection-counter { font-size: 0.85rem; color: var(--accent-color); font-weight: 600; background: rgba(56, 189, 248, 0.1); padding: 0.35rem 0.75rem; border-radius: 0.5rem; border: 1px solid rgba(56, 189, 248, 0.2); }
.view-toggle { display: flex; background-color: var(--sidebar-bg); border: 1px solid var(--border-color); border-radius: 0.5rem; padding: 2px; }
.view-btn { background: none; border: none; color: var(--text-muted); padding: 0.4rem 0.6rem; border-radius: 0.35rem; cursor: pointer; display: flex; align-items: center; }
.view-btn.active { background-color: var(--card-hover); color: var(--accent-color); }

/* GRID & LIST VIEWS */
.file-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 1.25rem; min-height: 250px; align-content: start; }
.grid-item { background-color: var(--card-bg); border: 1px solid var(--border-color); border-radius: 0.75rem; padding: 1rem; display: flex; flex-direction: column; gap: 0.75rem; cursor: pointer; transition: all 0.15s ease; position: relative; user-select: none; }
.grid-item:hover { background-color: var(--card-hover); transform: translateY(-2px); border-color: rgba(255, 255, 255, 0.15); }
.grid-item.selected { background-color: var(--card-selected) !important; border-color: var(--border-selected) !important; }
.grid-item-preview { height: 110px; background-color: #1a1a1a; border-radius: 0.5rem; display: flex; align-items: center; justify-content: center; color: var(--accent-color); overflow: hidden; pointer-events: none; }
.grid-item-preview img { width: 100%; height: 100%; object-fit: cover; }
.grid-item-info { display: flex; align-items: flex-start; justify-content: space-between; gap: 0.5rem; pointer-events: none; }
.grid-item-title { font-size: 0.875rem; font-weight: 500; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; max-width: 140px; }
.grid-item-meta { font-size: 0.75rem; color: var(--text-muted); display: flex; align-items: center; gap: 0.35rem; margin-top: 0.2rem; line-height: 1; }

.file-table-container { width: 100%; border: 1px solid var(--border-color); border-radius: 0.75rem; background-color: var(--card-bg); overflow: hidden; min-height: 250px; }
.file-table { width: 100%; border-collapse: collapse; text-align: left; font-size: 0.875rem; }
.file-table th { background-color: var(--sidebar-bg); padding: 0.875rem 1.25rem; color: var(--text-muted); font-weight: 500; border-bottom: 1px solid var(--border-color); }
.file-table td { padding: 0.875rem 1.25rem; border-bottom: 1px solid var(--border-color); }
.file-table tr:hover td { background-color: var(--card-hover); cursor: pointer; }
.file-table tr.selected td { background-color: var(--card-selected) !important; color: var(--text-main); }
.file-name-cell { display: flex; align-items: center; gap: 0.75rem; font-weight: 500; pointer-events: none; }

/* MENUS & MODALS */
.icon-btn { background: none; border: none; color: var(--text-muted); cursor: pointer; padding: 0.3rem; border-radius: 0.35rem; display: flex; align-items: center; pointer-events: auto; }
.icon-btn:hover { color: var(--text-main); background-color: rgba(255, 255, 255, 0.08); }
.hidden { display: none !important; }

.dropdown-menu { position: fixed; z-index: 1050; background-color: var(--sidebar-bg); border: 1px solid var(--border-color); border-radius: 0.75rem; box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.5); width: 220px; padding: 0.5rem 0; display: flex; flex-direction: column; }
.account-menu { position: absolute; top: calc(var(--topbar-height) - 10px); right: 2rem; width: 240px; }
.account-header { padding: 0.75rem 1rem; border-bottom: 1px solid var(--border-color); display: flex; flex-direction: column; gap: 0.25rem; }
.account-name { font-weight: 600; font-size: 0.9rem; color: var(--text-main); }
.account-email { font-size: 0.75rem; color: var(--text-muted); }
.dropdown-item { display: flex; align-items: center; gap: 0.75rem; padding: 0.6rem 1rem; font-size: 0.85rem; color: var(--text-main); cursor: pointer; background: none; border: none; width: 100%; text-align: left; }
.dropdown-item:hover { background-color: var(--card-hover); }
.dropdown-item.danger { color: var(--danger-color); }
.dropdown-item.danger:hover { background-color: rgba(239, 68, 68, 0.1); }
.dropdown-divider { height: 1px; background-color: var(--border-color); margin: 0.35rem 0; }

.modal-overlay { position: fixed; inset: 0; background: rgba(0, 0, 0, 0.75); backdrop-filter: blur(4px); display: flex; align-items: center; justify-content: center; z-index: 1000; }
.modal-card { background-color: var(--sidebar-bg); border: 1px solid var(--border-color); border-radius: 1rem; width: 100%; max-width: 520px; padding: 1.75rem; display: flex; flex-direction: column; gap: 1.25rem; position: relative; }
.modal-title { font-size: 1.15rem; font-weight: 600; }
.modal-actions { display: flex; justify-content: flex-end; gap: 0.75rem; margin-top: auto; }
.btn-secondary { background: var(--card-hover); color: var(--text-main); border: 1px solid var(--border-color); border-radius: 0.5rem; padding: 0.6rem 1.25rem; cursor: pointer; }
.btn-primary { background: var(--accent-color); color: #121212; font-weight: 600; border: none; border-radius: 0.5rem; padding: 0.6rem 1.25rem; cursor: pointer; }
.btn-danger { background: var(--danger-color); color: #ffffff; font-weight: 600; border: none; border-radius: 0.5rem; padding: 0.6rem 1.25rem; cursor: pointer; }
.modal-input { width: 100%; background-color: var(--card-bg); border: 1px solid var(--border-color); border-radius: 0.5rem; padding: 0.75rem 1rem; color: var(--text-main); font-size: 0.9rem; outline: none; }
.modal-input:focus { border-color: var(--accent-color); }

.live-progress-bar-container { height: 8px; background-color: var(--card-bg); border-radius: 4px; overflow: hidden; border: 1px solid var(--border-color); position: relative; }
.live-progress-fill { width: 0%; height: 100%; background: linear-gradient(90deg, var(--accent-color), #00e5ff); border-radius: 4px; transition: width 0.1s linear; }
.transfer-stats { display: flex; justify-content: space-between; font-size: 0.75rem; color: var(--text-muted); }
.empty-state { text-align: center; padding: 3rem 1rem; color: var(--text-muted); width: 100%; grid-column: 1 / -1; }

#toast-container { position: fixed; bottom: 1.5rem; right: 1.5rem; z-index: 1200; display: flex; flex-direction: column; gap: 0.5rem; }
.toast { background-color: var(--sidebar-bg); border: 1px solid var(--border-color); color: var(--text-main); padding: 0.75rem 1.25rem; border-radius: 0.5rem; font-size: 0.85rem; box-shadow: 0 4px 15px rgba(0,0,0,0.5); }