* { margin:0; padding:0; box-sizing:border-box; }
:root {
  --bg: #0f0f1a;
  --surface: #1a1a2e;
  --surface2: #252540;
  --primary: #6c63ff;
  --primary-hover: #5a52d5;
  --text: #e0e0e0;
  --text-muted: #888;
  --border: #2a2a40;
  --danger: #ff4757;
  --success: #2ed573;
  --warning: #ffa502;
}
body {
  font-family: 'Segoe UI', system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
}
a { color: var(--primary); text-decoration:none; }
a:hover { text-decoration:underline; }

/* Layout */
.header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 12px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: sticky;
  top: 0;
  z-index: 100;
}
.header .logo { font-size: 1.3em; font-weight:700; color: var(--primary); }
.header .user-menu { display:flex; align-items:center; gap:16px; }
.header .user-menu span { color: var(--text-muted); }
.btn {
  padding: 8px 18px;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  font-size: 0.95em;
  font-weight: 500;
  transition: all 0.2s;
  background: var(--surface2);
  color: var(--text);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.btn:hover { filter: brightness(1.2); }
.btn.primary { background: var(--primary); color: #fff; }
.btn.primary:hover { background: var(--primary-hover); }
.btn.danger { background: var(--danger); color: #fff; }
.btn.success { background: var(--success); color: #111; }
.btn.small { padding: 4px 12px; font-size: 0.85em; }
.btn.icon { padding: 6px 10px; font-size: 1.1em; }

/* Breadcrumb */
.breadcrumb {
  padding: 12px 24px;
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.9em;
  flex-wrap: wrap;
}
.breadcrumb a { color: var(--primary); }
.breadcrumb span { color: var(--text-muted); }

/* Toolbar */
.toolbar {
  padding: 8px 24px;
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  align-items: center;
  border-bottom: 1px solid var(--border);
}
.toolbar input[type="text"] {
  padding: 8px 14px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
  color: var(--text);
  font-size: 0.95em;
  width: 250px;
}
.toolbar input[type="text"]:focus {
  outline: none;
  border-color: var(--primary);
}
.toolbar input[type="file"] { display:none; }

/* File grid */
.file-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 12px;
  padding: 20px 24px;
}
.file-item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px 12px;
  text-align: center;
  cursor: pointer;
  transition: all 0.2s;
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}
.file-item:hover {
  border-color: var(--primary);
  background: var(--surface2);
  transform: translateY(-2px);
}
.file-item.selected { border-color: var(--primary); background: var(--surface2); }
.file-item .icon {
  font-size: 2.5em;
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 12px;
}
.file-item .icon.folder { color: var(--warning); }
.file-item .icon.image { color: var(--success); }
.file-item .icon.video { color: var(--danger); }
.file-item .icon.code { color: var(--primary); }
.file-item .icon.doc { color: #1e90ff; }
.file-item .name {
  font-size: 0.85em;
  word-break: break-word;
  max-width: 100%;
  overflow: hidden;
  text-overflow: ellipsis;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  line-height: 1.3;
}
.file-item .size {
  font-size: 0.75em;
  color: var(--text-muted);
}

/* Context menu */
.context-menu {
  display: none;
  position: fixed;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 6px 0;
  min-width: 180px;
  z-index: 1000;
  box-shadow: 0 8px 32px rgba(0,0,0,0.4);
}
.context-menu.show { display: block; }
.context-menu .item {
  padding: 10px 18px;
  cursor: pointer;
  font-size: 0.9em;
  display: flex;
  align-items: center;
  gap: 10px;
}
.context-menu .item:hover { background: var(--surface2); }
.context-menu .divider { border-top: 1px solid var(--border); margin: 4px 0; }

/* Modal */
.modal-overlay {
  display: none;
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0,0,0,0.6);
  z-index: 500;
  justify-content: center;
  align-items: center;
}
.modal-overlay.show { display: flex; }
.modal {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 28px;
  min-width: 360px;
  max-width: 500px;
  width: 90%;
  max-height: 80vh;
  overflow-y: auto;
}
.modal h3 { margin-bottom: 16px; color: var(--primary); }
.modal .form-group { margin-bottom: 14px; }
.modal label { display: block; margin-bottom: 6px; font-size: 0.9em; color: var(--text-muted); }
.modal input, .modal select {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg);
  color: var(--text);
  font-size: 0.95em;
}
.modal input:focus, .modal select:focus {
  outline: none;
  border-color: var(--primary);
}
.modal .actions {
  display: flex;
  gap: 10px;
  justify-content: flex-end;
  margin-top: 20px;
}
.modal .actions .btn { min-width: 80px; }

/* Toast */
.toast-container {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 2000;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.toast {
  padding: 14px 20px;
  border-radius: 10px;
  color: #fff;
  font-size: 0.9em;
  animation: slideIn 0.3s ease;
  max-width: 350px;
}
.toast.error { background: var(--danger); }
.toast.success { background: var(--success); color: #111; }
.toast.info { background: var(--primary); }
@keyframes slideIn { from { opacity:0; transform:translateX(100px); } to { opacity:1; transform:translateX(0); } }

/* Share link */
.share-link {
  background: var(--bg);
  padding: 10px 14px;
  border-radius: 8px;
  font-family: monospace;
  font-size: 0.9em;
  word-break: break-all;
  margin: 10px 0;
}

/* Upload progress */
.upload-progress {
  display: none;
  padding: 8px 24px;
  background: var(--surface2);
  border-bottom: 1px solid var(--border);
}
.upload-progress .bar {
  height: 4px;
  background: var(--primary);
  border-radius: 2px;
  transition: width 0.3s;
}
.upload-progress .text { font-size: 0.8em; color: var(--text-muted); margin-bottom: 4px; }

/* Dropzone overlay */
.dropzone-overlay {
  position: fixed; top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(108, 99, 255, 0.15);
  backdrop-filter: blur(4px);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  pointer-events: none;
}
.dropzone-overlay.dragging { display: flex; }
.dropzone-content {
  background: var(--card-bg);
  border: 3px dashed var(--primary);
  border-radius: 20px;
  padding: 60px 100px;
  text-align: center;
  box-shadow: 0 10px 40px rgba(0,0,0,0.2);
}
.dropzone-icon { font-size: 64px; margin-bottom: 16px; }
.dropzone-text { font-size: 24px; color: var(--text); font-weight: 600; }

/* Login / Register pages */
.auth-container {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  padding: 20px;
}
.auth-box {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 36px;
  width: 100%;
  max-width: 420px;
}
.auth-box h1 { text-align: center; margin-bottom: 8px; color: var(--primary); }
.auth-box .subtitle { text-align: center; color: var(--text-muted); margin-bottom: 24px; font-size: 0.9em; }
.auth-box .form-group { margin-bottom: 16px; }
.auth-box label { display: block; margin-bottom: 6px; font-size: 0.9em; color: var(--text-muted); }
.auth-box input {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--bg);
  color: var(--text);
  font-size: 1em;
}
.auth-box input:focus { outline: none; border-color: var(--primary); }
.auth-box .btn { width: 100%; padding: 14px; font-size: 1em; margin-top: 8px; }
.auth-box .links { text-align: center; margin-top: 16px; font-size: 0.9em; }
.auth-box .links a { margin: 0 4px; }

.error-msg { color: var(--danger); font-size: 0.85em; margin-top: 4px; min-height: 1.2em; }

/* Loading spinner */
.spinner {
  display: inline-block;
  width: 20px; height: 20px;
  border: 2px solid var(--border);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* Admin panel */
.admin-container { padding: 20px 24px; }
.admin-tabs { display:flex; gap:0; margin-bottom: 20px; border-bottom: 2px solid var(--border); }
.admin-tab {
  padding: 12px 24px;
  cursor: pointer;
  border: none;
  background: none;
  color: var(--text-muted);
  font-size: 1em;
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
  transition: all 0.2s;
}
.admin-tab:hover { color: var(--text); }
.admin-tab.active { color: var(--primary); border-bottom-color: var(--primary); }
.admin-panel { display: none; }
.admin-panel.active { display: block; }

/* Tables */
.table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 16px;
}
.table th {
  text-align: left;
  padding: 12px 16px;
  background: var(--surface2);
  font-weight: 600;
  font-size: 0.85em;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border);
}
.table td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
  font-size: 0.9em;
}
.table tr:hover td { background: rgba(108,99,255,0.05); }
.table .actions { display: flex; gap: 6px; flex-wrap: wrap; }

/* Empty state */
.empty {
  text-align: center;
  padding: 60px 20px;
  color: var(--text-muted);
}
.empty .icon { font-size: 4em; margin-bottom: 16px; }
.empty p { font-size: 1.1em; }

/* Drop zone */
.drop-zone-active { border: 2px dashed var(--primary) !important; }
.file-item.drop-target {
  outline: 2px dashed var(--primary) !important;
  outline-offset: -2px;
  border-radius: 10px;
  background: rgba(108, 99, 255, 0.08) !important;
}

/* Responsive */
@media (max-width: 768px) {
  .header { padding: 10px; flex-wrap: wrap; gap: 6px; }
  .header .logo { font-size: 1.1em; }
  .user-menu { flex-wrap: wrap; gap: 4px; }
  .user-menu .btn.small, .user-menu a.btn.small { font-size: 0.75em; padding: 4px 8px; }
  .toolbar { padding: 8px 10px; flex-wrap: wrap; gap: 6px; }
  .toolbar .btn { font-size: 0.78em; padding: 6px 10px; }
  .toolbar .btn.primary { order: -1; }
  .toolbar input[type="text"] { font-size: 0.85em; min-width: 0; flex: 1; }
  #search-input { max-width: 120px; }
  .file-grid { grid-template-columns: repeat(auto-fill, minmax(130px, 1fr)); gap: 6px; padding: 10px; }
  .file-item { padding: 10px 8px; }
  .file-item .icon { font-size: 1.6em; width: 36px; height: 36px; }
  .file-item .name { font-size: 0.82em; }
  .file-item .size { font-size: 0.72em; }
  .file-item .actions { opacity: 1; }
  .file-item .actions .btn.small { font-size: 0.72em; padding: 4px 6px; }
  .breadcrumb { padding: 8px 12px; font-size: 0.82em; }
  .modal { min-width: unset; max-width: 92vw; padding: 16px; }
  .auth-container { padding: 20px 12px !important; }
  .auth-box { padding: 24px 16px; }
  .share-link { font-size: 0.75em; word-break: break-all; }
}

@media (max-width: 480px) {
  .auth-container { padding: 10px; }
  .auth-box { padding: 20px 14px; max-width: 100%; }
  .auth-box input { padding: 10px 12px; font-size: 0.9em; }
  .auth-box .btn { padding: 12px; font-size: 0.9em; }
  .header .logo { font-size: 1em; }
  .user-menu .btn.small { font-size: 0.7em; padding: 3px 6px; }
  .toolbar .btn { font-size: 0.72em; padding: 5px 8px; }
  .toolbar input { max-width: 80px !important; }
  .file-grid { grid-template-columns: repeat(auto-fill, minmax(100px, 1fr)); gap: 4px; padding: 6px; }
  .file-item { padding: 8px 6px; }
  .file-item .icon { font-size: 1.3em; width: 30px; height: 30px; }
  .file-item .name { font-size: 0.75em; }
  .file-item .actions { flex-wrap: wrap; gap: 2px; }
  .file-item .actions .btn.small { font-size: 0.65em; padding: 3px 5px; }
  .storage-bar { flex-direction: column; align-items: stretch; gap: 4px; padding: 6px 10px; }
  .storage-info { font-size: 0.7em; }
  .breadcrumb { padding: 6px 10px; font-size: 0.75em; }
  .context-menu { font-size: 0.85em; }
  .context-menu .item { padding: 8px 14px; }
  .email-row { flex-direction: column; }
  .email-row input { min-width: unset !important; }
  .email-row button { width: 100%; }
}

/* File grid actions */
.file-item .actions {
  display: flex;
  gap: 4px;
  align-items: center;
  opacity: 0;
  transition: opacity 0.2s;
}
.file-item:hover .actions {
  opacity: 1;
}
/* Always show actions on touch devices */
.file-item .actions {
  opacity: 0;
  transition: opacity 0.2s;
}
.file-item:hover .actions {
  opacity: 1;
}
@media (hover: none), (pointer: coarse) {
  .file-item .actions { opacity: 1; }
  .file-item .actions .btn.small { padding: 6px 10px; font-size: 0.9em; }
}
.file-item .actions .btn.small {
  padding: 4px 8px;
  font-size: 0.8em;
  min-width: unset;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 6px;
}
.file-item .actions .btn.small:hover {
  background: var(--surface2);
  border-color: var(--primary);
}

/* ===== Preview Modal ===== */
.preview-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
}

.preview-backdrop {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.85);
  backdrop-filter: blur(8px);
  animation: fadeIn 0.2s ease;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

.preview-panel {
  position: relative;
  z-index: 1;
  width: 92vw;
  max-width: 1200px;
  max-height: 90vh;
  background: var(--surface);
  border-radius: 14px;
  border: 1px solid var(--border);
  box-shadow: 0 24px 64px rgba(0,0,0,0.5);
  display: flex;
  flex-direction: column;
  animation: slideUp 0.25s ease;
}

@keyframes slideUp {
  from { opacity: 0; transform: translateY(20px) scale(0.97); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}

.preview-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 20px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.preview-filename {
  font-weight: 600;
  font-size: 1em;
  color: var(--text);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  max-width: 60%;
}

.preview-body {
  flex: 1;
  overflow: auto;
  padding: 16px;
  min-height: 200px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.preview-body video {
  max-width: 100%;
  max-height: 100%;
  border-radius: 4px;
}

.preview-body audio {
  max-width: 100%;
}

.preview-body img {
  transition: transform 0.2s ease;
}

/* Scrollbar styling for text preview */
.preview-text-container::-webkit-scrollbar {
  width: 8px;
}
.preview-text-container::-webkit-scrollbar-track {
  background: transparent;
}
.preview-text-container::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 4px;
}
.preview-text-container::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}

@media (max-width: 600px) {
  .preview-panel {
    width: 98vw;
    max-height: 95vh;
    border-radius: 10px;
  }
  .preview-header {
    padding: 10px 14px;
  }
  .preview-filename {
    max-width: 50%;
    font-size: 0.9em;
  }
  .preview-body {
    padding: 8px;
  }
}

/* ===== Storage Bar ===== */
.storage-bar {
  display: none;
  align-items: center;
  gap: 12px;
  padding: 8px 20px;
  background: var(--surface2);
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
}

.storage-info {
  font-size: 0.82em;
  color: var(--text-muted);
  white-space: nowrap;
  flex-shrink: 0;
}

.storage-track {
  flex: 1;
  min-width: 100px;
  height: 6px;
  background: var(--border);
  border-radius: 3px;
  overflow: hidden;
}

.storage-fill {
  height: 100%;
  border-radius: 3px;
  transition: width 0.5s ease, background 0.3s ease;
}

/* ===== Backup Page ===== */
.backup-settings .form-group label {
  display: block;
  margin-bottom: 6px;
  font-size: 0.9em;
  color: var(--text-muted);
}

@media (max-width: 600px) {
  .storage-bar {
    padding: 6px 12px;
    gap: 8px;
  }
  .storage-info {
    font-size: 0.75em;
  }
}