@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

:root {
  --bg-main: #f8fafc;
  --bg-card: #ffffff;
  --bg-sidebar: #ffffff;
  --border-color: #e2e8f0;
  --border-hover: #cbd5e1;
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --primary-light: #eff6ff;
  --text-main: #0f172a;
  --text-muted: #64748b;
  --text-light: #94a3b8;
  --danger: #ef4444;
  --danger-light: #fef2f2;
  --success: #10b981;
  --warning: #f59e0b;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.06);
  --shadow-lg: 0 10px 25px rgba(0,0,0,0.1);
  --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-main);
  color: var(--text-main);
  line-height: 1.5;
  font-size: 14px;
  overflow-x: hidden;
}

a {
  color: var(--primary);
  text-decoration: none;
}

/* App Container Layout */
.app-container {
  display: flex;
  height: 100vh;
  width: 100vw;
  overflow: hidden;
  position: relative;
}

/* Sidebar Drawer */
.sidebar {
  width: 240px;
  background-color: var(--bg-sidebar);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  padding: 20px 16px;
  flex-shrink: 0;
  z-index: 1050;
  transition: transform 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

.sidebar-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background-color: rgba(15, 23, 42, 0.4);
  backdrop-filter: blur(2px);
  z-index: 1040;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease;
}

.sidebar-overlay.active {
  opacity: 1;
  pointer-events: auto;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 18px;
  color: var(--text-main);
  margin-bottom: 24px;
  padding-left: 8px;
}

.brand-icon {
  width: 32px;
  height: 32px;
  background: linear-gradient(135deg, #2563eb, #3b82f6);
  color: #fff;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  box-shadow: 0 2px 8px rgba(37, 99, 235, 0.3);
}

.btn-new-upload {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
  color: var(--text-main);
  padding: 10px 18px;
  border-radius: 24px;
  font-weight: 600;
  cursor: pointer;
  margin-bottom: 20px;
  transition: all 0.2s ease;
}

.btn-new-upload:hover {
  background-color: var(--primary-light);
  border-color: #bfdbfe;
  color: var(--primary);
  box-shadow: var(--shadow-md);
}

.nav-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.nav-item a {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  font-weight: 500;
  transition: all 0.15s ease;
}

.nav-item a:hover {
  background-color: #f1f5f9;
  color: var(--text-main);
}

.nav-item.active a {
  background-color: var(--primary-light);
  color: var(--primary);
  font-weight: 600;
}

.storage-widget {
  margin-top: auto;
  padding: 14px;
  background-color: #f8fafc;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
}

.storage-info {
  display: flex;
  justify-content: space-between;
  font-size: 12px;
  font-weight: 500;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.progress-bar-bg {
  width: 100%;
  height: 6px;
  background-color: #e2e8f0;
  border-radius: 3px;
  overflow: hidden;
}

.progress-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, #2563eb, #3b82f6);
  border-radius: 3px;
  transition: width 0.3s ease;
}

/* Main Content Area */
.main-wrapper {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  background-color: var(--bg-main);
}

/* Top Navbar */
.topbar {
  height: 64px;
  background-color: var(--bg-card);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 20px;
  gap: 12px;
}

.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  font-size: 24px;
  color: var(--text-main);
  cursor: pointer;
  padding: 6px;
  border-radius: var(--radius-sm);
}

.mobile-menu-btn:hover {
  background-color: #f1f5f9;
}

.search-box {
  position: relative;
  width: 440px;
  max-width: 100%;
}

.search-box input {
  width: 100%;
  padding: 8px 16px 8px 38px;
  border-radius: 20px;
  border: 1px solid var(--border-color);
  background-color: #f8fafc;
  font-size: 14px;
  outline: none;
  transition: all 0.2s ease;
}

.search-box input:focus {
  background-color: #ffffff;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.search-box i {
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-light);
}

.user-profile {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.user-avatar {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  object-fit: cover;
  border: 1px solid var(--border-color);
}

.avatar-placeholder {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background-color: var(--primary);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  font-size: 13px;
}

/* Content Container */
.content-area {
  flex: 1;
  padding: 20px;
  overflow-y: auto;
}

.breadcrumbs {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 16px;
  flex-wrap: wrap;
}

.breadcrumb-item {
  cursor: pointer;
  transition: color 0.15s ease;
}

.breadcrumb-item:hover {
  color: var(--primary);
}

.breadcrumb-item.active {
  color: var(--text-main);
  cursor: default;
}

.action-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
  gap: 12px;
  flex-wrap: wrap;
}

.toolbar-buttons {
  display: flex;
  gap: 8px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  border: 1px solid var(--border-color);
  background-color: var(--bg-card);
  color: var(--text-main);
  transition: all 0.15s ease;
  white-space: nowrap;
}

.btn:hover {
  background-color: #f1f5f9;
  border-color: var(--border-hover);
}

.btn-primary {
  background-color: var(--primary);
  color: #fff;
  border-color: var(--primary);
}

.btn-primary:hover {
  background-color: var(--primary-hover);
  border-color: var(--primary-hover);
}

/* Folders Grid & Files Table */
.section-title {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 12px;
}

.folders-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 14px;
  margin-bottom: 24px;
}

.folder-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 12px 14px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  transition: all 0.2s ease;
}

.folder-card:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow-sm);
  transform: translateY(-1px);
}

.folder-info {
  display: flex;
  align-items: center;
  gap: 10px;
  overflow: hidden;
}

.folder-icon {
  font-size: 22px;
  color: #f59e0b;
}

.folder-name {
  font-weight: 500;
  font-size: 13px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* Files Table */
.files-table-wrapper {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow-x: auto;
  box-shadow: var(--shadow-sm);
}

.files-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  min-width: 540px;
}

.files-table th {
  background-color: #f8fafc;
  padding: 10px 14px;
  font-size: 12px;
  font-weight: 600;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border-color);
}

.files-table td {
  padding: 10px 14px;
  border-bottom: 1px solid var(--border-color);
  vertical-align: middle;
}

.files-table tr:last-child td {
  border-bottom: none;
}

.files-table tr:hover td {
  background-color: #f8fafc;
}

.file-name-cell {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 500;
  cursor: pointer;
}

.file-icon {
  font-size: 20px;
  width: 22px;
  text-align: center;
}

/* Forms & Input Controls */
.form-group {
  margin-bottom: 16px;
  text-align: left;
}

.form-group label {
  display: block;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-muted);
  margin-bottom: 6px;
}

.form-control {
  width: 100%;
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
  font-size: 14px;
  font-family: inherit;
  outline: none;
  background-color: #ffffff;
  color: var(--text-main);
  transition: all 0.2s ease;
}

.form-control:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.file-icon.pdf { color: #ef4444; }
.file-icon.image { color: #3b82f6; }
.file-icon.video { color: #8b5cf6; }
.file-icon.audio { color: #ec4899; }
.file-icon.doc { color: #2563eb; }
.file-icon.zip { color: #f59e0b; }

.action-menu-btn {
  background: none;
  border: none;
  color: var(--text-light);
  cursor: pointer;
  padding: 6px;
  border-radius: 50%;
  transition: all 0.15s ease;
}

.action-menu-btn:hover {
  background-color: #e2e8f0;
  color: var(--text-main);
}

/* Upload Tray */
.upload-tray {
  position: fixed;
  bottom: 20px;
  right: 20px;
  width: 360px;
  max-width: calc(100vw - 40px);
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  z-index: 1000;
  display: none;
}

.upload-tray.active {
  display: block;
}

.upload-tray-header {
  background-color: #f8fafc;
  padding: 10px 14px;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-weight: 600;
}

.upload-items-list {
  max-height: 240px;
  overflow-y: auto;
  padding: 8px 14px;
}

/* Modals */
.modal-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background-color: rgba(15, 23, 42, 0.4);
  backdrop-filter: blur(3px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 2000;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease;
  padding: 16px;
}

.modal-backdrop.active {
  opacity: 1;
  pointer-events: auto;
}

.modal-card {
  background-color: var(--bg-card);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  width: 460px;
  max-width: 100%;
  padding: 20px;
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
}

.modal-title {
  font-weight: 600;
  font-size: 15px;
}

.modal-close {
  background: none;
  border: none;
  font-size: 18px;
  color: var(--text-light);
  cursor: pointer;
}

/* Context Menu */
.context-menu {
  position: fixed;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  padding: 6px 0;
  z-index: 3000;
  width: 180px;
  display: none;
}

.context-menu-item {
  padding: 8px 14px;
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  color: var(--text-main);
  cursor: pointer;
  transition: background 0.1s ease;
}

.context-menu-item:hover {
  background-color: #f1f5f9;
  color: var(--primary);
}

.context-menu-item.danger {
  color: var(--danger);
}

.context-menu-item.danger:hover {
  background-color: var(--danger-light);
}

/* Drag Overlay */
.drag-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background-color: rgba(37, 99, 235, 0.05);
  border: 3px dashed var(--primary);
  z-index: 4000;
  display: none;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  pointer-events: none;
}

.drag-overlay.active {
  display: flex;
}

/* ==========================================================================
   MOBILE & TABLET RESPONSIVE STYLES
   ========================================================================== */

@media (max-width: 768px) {
  .mobile-menu-btn {
    display: flex;
    align-items: center;
    justify-content: center;
  }

  .sidebar {
    position: fixed;
    top: 0;
    left: 0;
    height: 100vh;
    transform: translateX(-100%);
    box-shadow: var(--shadow-lg);
  }

  .sidebar.open {
    transform: translateX(0);
  }

  .topbar {
    padding: 0 14px;
  }

  .search-box {
    width: 100%;
  }

  .user-profile span {
    display: none;
  }

  .content-area {
    padding: 16px;
  }

  .folders-grid {
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    gap: 10px;
  }

  .action-toolbar {
    flex-direction: column;
    align-items: stretch;
  }

  .toolbar-buttons {
    width: 100%;
  }

  .toolbar-buttons .btn {
    flex: 1;
    justify-content: center;
  }
}

@media (max-width: 480px) {
  .folders-grid {
    grid-template-columns: 1fr 1fr;
  }

  .folder-card {
    padding: 10px;
  }

  .folder-name {
    font-size: 12px;
  }

  .upload-tray {
    bottom: 10px;
    right: 10px;
    left: 10px;
    width: auto;
  }
}

.spin-icon {
  display: inline-block;
  animation: spin 1s infinite linear;
}
@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}