:root {
  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  --bg-primary: #f8fafc;
  --bg-card: #ffffff;
  --bg-secondary: #f1f5f9;
  --border-color: #e2e8f0;
  --border-hover: #cbd5e1;
  --text-primary: #0f172a;
  --text-secondary: #64748b;
  --cf-orange: #f48120;
  --cf-orange-hover: #dc7015;
  --cf-blue: #0284c7;
  --accent-green: #10b981;
  --accent-red: #ef4444;
  --accent-red-hover: #dc2626;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.08), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.05);
  --radius: 12px;
  --radius-sm: 8px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg-primary: #090d16;
    --bg-card: #131b2e;
    --bg-secondary: #1e293b;
    --border-color: #243047;
    --border-hover: #374763;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 20px -3px rgba(0, 0, 0, 0.5);
  }
}

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.5;
  min-height: 100vh;
}

.app-layout {
  max-width: 1040px;
  margin: 0 auto;
  padding: 1.5rem 1rem 3rem;
}

/* Header */
.header {
  margin-bottom: 1.75rem;
  padding-bottom: 1.25rem;
  border-bottom: 1px solid var(--border-color);
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 1.25rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.85rem;
}

.logo-icon {
  font-size: 2.25rem;
  line-height: 1;
}

.brand h1 {
  font-size: 1.6rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.subtitle {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.header-badges {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  flex-wrap: wrap;
}

/* Badges */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.35rem 0.75rem;
  font-size: 0.8rem;
  font-weight: 600;
  border-radius: 9999px;
  text-decoration: none;
}

.badge code {
  background: rgba(0, 0, 0, 0.1);
  padding: 0.1rem 0.35rem;
  border-radius: 4px;
  font-family: monospace;
}

.badge-d1 {
  background-color: rgba(2, 132, 199, 0.15);
  color: var(--cf-blue);
  border: 1px solid rgba(2, 132, 199, 0.3);
}

.badge-r2 {
  background-color: rgba(244, 129, 32, 0.15);
  color: var(--cf-orange);
  border: 1px solid rgba(244, 129, 32, 0.3);
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--accent-green);
  box-shadow: 0 0 6px var(--accent-green);
}

.badge-success {
  background-color: rgba(16, 185, 129, 0.15);
  color: var(--accent-green);
  border: 1px solid rgba(16, 185, 129, 0.3);
}

.badge-warning {
  background-color: rgba(244, 129, 32, 0.15);
  color: var(--cf-orange);
  border: 1px solid rgba(244, 129, 32, 0.3);
}

/* Navigation Tabs */
.nav-tabs {
  display: flex;
  gap: 0.5rem;
  border-bottom: 1px solid var(--border-color);
}

.tab-btn {
  background: transparent;
  border: none;
  border-bottom: 2px solid transparent;
  padding: 0.65rem 1.1rem;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.15s ease-in-out;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.tab-btn:hover {
  color: var(--text-primary);
}

.tab-btn.active {
  color: var(--cf-orange);
  border-bottom-color: var(--cf-orange);
}

/* Cards & Layout */
.main-content {
  display: flex;
  flex-direction: column;
  gap: 1.75rem;
}

.card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 1.75rem;
  box-shadow: var(--shadow-sm);
}

.section-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 1rem;
}

.card h2 {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 0.25rem;
}

.section-desc {
  color: var(--text-secondary);
  font-size: 0.92rem;
}

.action-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

/* Add User Form */
.add-user-form {
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 1.25rem;
  margin-bottom: 1.25rem;
}

.add-user-form h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 1rem;
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
  margin-bottom: 1rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.form-group label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.form-group input,
.form-group select {
  padding: 0.6rem 0.75rem;
  border-radius: 6px;
  border: 1px solid var(--border-color);
  background-color: var(--bg-card);
  color: var(--text-primary);
  font-family: inherit;
  font-size: 0.9rem;
  outline: none;
  transition: border-color 0.15s;
}

.form-group input:focus,
.form-group select:focus {
  border-color: var(--cf-orange);
}

.form-buttons {
  display: flex;
  gap: 0.5rem;
}

/* Table Container & Users Table */
.table-container {
  overflow-x: auto;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  background: var(--bg-card);
}

.users-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.9rem;
}

.users-table th {
  background-color: var(--bg-secondary);
  color: var(--text-secondary);
  font-weight: 600;
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border-color);
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.users-table td {
  padding: 0.85rem 1rem;
  border-bottom: 1px solid var(--border-color);
  vertical-align: middle;
}

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

.users-table tr:hover td {
  background-color: rgba(148, 163, 184, 0.04);
}

.text-right {
  text-align: right;
}

.user-cell {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.user-avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  flex-shrink: 0;
}

.user-name {
  font-weight: 600;
  color: var(--text-primary);
}

.user-id {
  font-size: 0.78rem;
  color: var(--text-secondary);
}

.role-badge {
  display: inline-block;
  padding: 0.2rem 0.6rem;
  border-radius: 9999px;
  font-size: 0.76rem;
  font-weight: 600;
}

.role-admin {
  background-color: rgba(239, 68, 68, 0.15);
  color: var(--accent-red);
}

.role-engineer {
  background-color: rgba(2, 132, 199, 0.15);
  color: var(--cf-blue);
}

.role-designer {
  background-color: rgba(168, 85, 247, 0.15);
  color: #a855f7;
}

.role-lead {
  background-color: rgba(244, 129, 32, 0.15);
  color: var(--cf-orange);
}

.role-member {
  background-color: var(--bg-secondary);
  color: var(--text-secondary);
}

/* Dropzone (R2) */
.dropzone {
  border: 2px dashed var(--border-color);
  border-radius: var(--radius);
  padding: 2.5rem 1.5rem;
  text-align: center;
  cursor: pointer;
  background-color: var(--bg-primary);
  transition: border-color 0.2s, background-color 0.2s;
  position: relative;
}

.dropzone:hover,
.dropzone.dragover {
  border-color: var(--cf-orange);
  background-color: rgba(244, 129, 32, 0.04);
}

.dropzone:focus-visible {
  outline: 2px solid var(--cf-orange);
}

.file-input {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  cursor: pointer;
}

.upload-icon {
  width: 44px;
  height: 44px;
  color: var(--cf-orange);
  margin: 0 auto 0.75rem;
  display: block;
}

.dropzone-title {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.dropzone-title .highlight {
  color: var(--cf-orange);
  text-decoration: underline;
}

.dropzone-hint {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

/* Staging Area */
.staging-area {
  margin-top: 1.25rem;
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 1rem;
}

.staging-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.75rem;
}

.staging-header h3 {
  font-size: 0.95rem;
  font-weight: 600;
}

.staging-list {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  max-height: 220px;
  overflow-y: auto;
  margin-bottom: 1rem;
}

.staging-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--bg-card);
  padding: 0.5rem 0.75rem;
  border-radius: 6px;
  border: 1px solid var(--border-color);
  font-size: 0.88rem;
}

.staging-item-info {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  overflow: hidden;
}

.staging-thumb {
  width: 38px;
  height: 38px;
  border-radius: 4px;
  object-fit: cover;
  flex-shrink: 0;
  background-color: var(--bg-secondary);
}

.staging-item-name {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 250px;
}

.staging-item-size {
  color: var(--text-secondary);
  font-size: 0.8rem;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  font-weight: 600;
  font-size: 0.92rem;
  padding: 0.65rem 1.25rem;
  border-radius: 6px;
  cursor: pointer;
  border: 1px solid transparent;
  transition: all 0.15s ease-in-out;
  text-decoration: none;
}

.btn:active {
  transform: scale(0.98);
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.btn-primary {
  background-color: var(--cf-orange);
  color: #ffffff;
}

.btn-primary:hover:not(:disabled) {
  background-color: var(--cf-orange-hover);
}

.btn-secondary {
  background-color: var(--bg-secondary);
  color: var(--text-primary);
  border-color: var(--border-color);
}

.btn-secondary:hover:not(:disabled) {
  background-color: var(--border-color);
}

.btn-danger {
  background-color: rgba(239, 68, 68, 0.15);
  color: var(--accent-red);
  border-color: rgba(239, 68, 68, 0.3);
}

.btn-danger:hover:not(:disabled) {
  background-color: var(--accent-red);
  color: #ffffff;
}

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
}

.btn-ghost:hover {
  color: var(--text-primary);
}

.btn-sm {
  padding: 0.4rem 0.75rem;
  font-size: 0.82rem;
}

.btn-block {
  width: 100%;
}

.icon {
  width: 16px;
  height: 16px;
}

/* Status Alert */
.status-alert {
  margin-top: 1rem;
  padding: 0.85rem 1rem;
  border-radius: 8px;
  font-size: 0.9rem;
}

.status-alert.success {
  background-color: rgba(16, 185, 129, 0.12);
  border: 1px solid rgba(16, 185, 129, 0.3);
  color: var(--accent-green);
}

.status-alert.error {
  background-color: rgba(239, 68, 68, 0.12);
  border: 1px solid rgba(239, 68, 68, 0.3);
  color: var(--accent-red);
}

/* Gallery Grid */
.gallery-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 1rem;
}

.image-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 1.25rem;
  margin-top: 1rem;
}

.image-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  transition: transform 0.15s, box-shadow 0.15s;
}

.image-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: var(--border-hover);
}

.image-card-thumb-wrap {
  position: relative;
  width: 100%;
  aspect-ratio: 4 / 3;
  background-color: var(--bg-secondary);
  overflow: hidden;
  cursor: pointer;
}

.image-card-thumb {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.25s ease;
}

.image-card-thumb-wrap:hover .image-card-thumb {
  transform: scale(1.04);
}

.image-card-body {
  padding: 0.85rem;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.image-card-name {
  font-size: 0.88rem;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  margin-bottom: 0.35rem;
}

.image-card-meta {
  font-size: 0.76rem;
  color: var(--text-secondary);
  margin-bottom: 0.85rem;
}

.image-card-actions {
  display: flex;
  gap: 0.4rem;
  margin-top: auto;
}

.image-card-actions .btn {
  flex: 1;
}

/* Empty State & Loader */
.empty-state, .loader-container {
  text-align: center;
  padding: 3rem 1.5rem;
  color: var(--text-secondary);
}

.empty-icon {
  font-size: 3rem;
  margin-bottom: 0.75rem;
}

.empty-state h3 {
  color: var(--text-primary);
  font-size: 1.15rem;
  margin-bottom: 0.35rem;
}

.spinner {
  width: 32px;
  height: 32px;
  border: 3px solid var(--border-color);
  border-top-color: var(--cf-orange);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin: 0 auto 0.75rem;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* Setup Section */
.setup-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.25rem;
  margin-top: 1rem;
}

.setup-col {
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 1.25rem;
}

.setup-col h3 {
  font-size: 1.05rem;
  margin-bottom: 0.5rem;
  margin-top: 0.5rem;
}

.setup-col p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 0.75rem;
}

.setup-col code {
  display: block;
  background-color: var(--bg-secondary);
  padding: 0.45rem 0.65rem;
  border-radius: 6px;
  font-family: monospace;
  font-size: 0.82rem;
  margin-top: 0.4rem;
  border: 1px solid var(--border-color);
  word-break: break-all;
}

/* Modal */
.modal {
  border: none;
  background: transparent;
  padding: 0;
  max-width: 90vw;
  max-height: 90vh;
  margin: auto;
}

.modal::backdrop {
  background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(4px);
}

.modal-box {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  max-width: 800px;
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  position: relative;
}

.modal-close {
  position: absolute;
  top: 0.75rem;
  right: 0.75rem;
  width: 32px;
  height: 32px;
  background: rgba(0, 0, 0, 0.6);
  color: #fff;
  border: none;
  border-radius: 50%;
  font-size: 1.25rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10;
  transition: background 0.15s;
}

.modal-close:hover {
  background: rgba(0, 0, 0, 0.85);
}

.modal-image-wrapper {
  background-color: #000;
  display: flex;
  align-items: center;
  justify-content: center;
  max-height: 60vh;
  overflow: hidden;
}

.modal-image-wrapper img {
  max-width: 100%;
  max-height: 60vh;
  object-fit: contain;
}

.modal-details {
  padding: 1.25rem;
}

.modal-details h3 {
  font-size: 1.1rem;
  margin-bottom: 0.25rem;
  word-break: break-all;
}

.modal-details .subtext {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 1rem;
}

.modal-actions {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.hidden {
  display: none !important;
}