/* ========== CSS Variables / Dark Material Theme ========== */
:root {
  --primary: #7c4dff;
  --primary-dark: #651fff;
  --primary-light: #b388ff;
  --primary-surface: rgba(124,77,255,0.12);
  --accent: #69f0ae;
  --accent-dim: rgba(105,240,174,0.15);
  --bg: #0e1117;
  --bg-elevated: #151921;
  --surface: #1a1f2e;
  --surface-2: #212738;
  --surface-3: #2a3142;
  --surface-hover: #252c3f;
  --surface-active: #2e3650;
  --text-primary: #e8eaed;
  --text-secondary: #9aa0b0;
  --text-hint: #636b80;
  --divider: rgba(255,255,255,0.07);
  --divider-strong: rgba(255,255,255,0.12);
  --error: #ff5252;
  --error-bg: rgba(255,82,82,0.12);
  --success: #69f0ae;
  --success-bg: rgba(105,240,174,0.12);
  --warning: #ffd740;
  --warning-bg: rgba(255,215,64,0.12);
  --shadow-1: 0 2px 8px rgba(0,0,0,0.3);
  --shadow-2: 0 4px 16px rgba(0,0,0,0.35);
  --shadow-3: 0 8px 32px rgba(0,0,0,0.45);
  --shadow-glow: 0 0 20px rgba(124,77,255,0.15);
  --radius: 12px;
  --radius-sm: 8px;
  --radius-xs: 4px;
  --sidebar-width: 260px;
  --topbar-height: 60px;
  --transition: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ========== Reset ========== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html, body { height: 100%; }
body {
  font-family: 'Roboto', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
.hidden { display: none !important; }

/* ========== Login ========== */
.login-container {
  display: flex; justify-content: center; align-items: center;
  min-height: 100vh; padding: 16px;
  background: var(--bg);
  background-image:
    radial-gradient(ellipse at 20% 50%, rgba(124,77,255,0.08) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 20%, rgba(105,240,174,0.05) 0%, transparent 50%);
}
.login-card {
  background: var(--surface); border-radius: 20px;
  padding: 48px 36px; width: 100%; max-width: 420px;
  box-shadow: var(--shadow-3);
  border: 1px solid var(--divider);
  position: relative; overflow: hidden;
}
.login-card::before {
  content: '';
  position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
}
.login-header { text-align: center; margin-bottom: 36px; }
.login-icon {
  font-size: 52px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}
.login-header h1 {
  font-size: 26px; font-weight: 500; margin-top: 12px;
  color: var(--text-primary); letter-spacing: -0.5px;
}
.login-header p { color: var(--text-secondary); font-size: 14px; margin-top: 6px; }

.input-group {
  display: flex; align-items: center; gap: 12px;
  border: 1px solid var(--divider-strong); border-radius: var(--radius-sm);
  padding: 14px 16px; margin-bottom: 20px;
  background: var(--surface-2);
  transition: border-color var(--transition), box-shadow var(--transition);
}
.input-group:focus-within {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(124,77,255,0.15);
}
.input-group .material-icons { color: var(--text-hint); font-size: 20px; }
.input-group:focus-within .material-icons { color: var(--primary-light); }
.input-group input {
  border: none; outline: none; flex: 1; font-size: 15px;
  font-family: inherit; background: transparent; color: var(--text-primary);
}
.input-group input::placeholder { color: var(--text-hint); }
.error-msg {
  color: var(--error); font-size: 13px; margin-bottom: 12px;
  padding: 8px 12px; background: var(--error-bg); border-radius: var(--radius-xs);
}

/* ========== Buttons ========== */
.btn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 10px 22px; border: none; border-radius: var(--radius-sm);
  font-family: inherit; font-size: 13px; font-weight: 500;
  cursor: pointer; transition: all var(--transition);
  text-transform: uppercase; letter-spacing: 0.8px; white-space: nowrap;
  position: relative; overflow: hidden;
}
.btn .material-icons { font-size: 18px; }
.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #fff; box-shadow: 0 2px 8px rgba(124,77,255,0.3);
}
.btn-primary:hover {
  box-shadow: 0 4px 16px rgba(124,77,255,0.45);
  transform: translateY(-1px);
}
.btn-primary:active { transform: translateY(0); }
.btn-outline {
  background: transparent; color: var(--primary-light);
  border: 1px solid rgba(124,77,255,0.4);
}
.btn-outline:hover { background: var(--primary-surface); border-color: var(--primary); }
.btn-danger {
  background: rgba(255,82,82,0.15); color: var(--error);
  border: 1px solid rgba(255,82,82,0.3);
}
.btn-danger:hover { background: rgba(255,82,82,0.25); }
.btn-success {
  background: rgba(105,240,174,0.12); color: var(--success);
  border: 1px solid rgba(105,240,174,0.3);
}
.btn-success:hover { background: rgba(105,240,174,0.22); }
.btn-small { padding: 6px 14px; font-size: 11px; }
.btn-full { width: 100%; justify-content: center; padding: 14px; font-size: 14px; }
.btn-icon {
  background: none; border: none; cursor: pointer; padding: 8px;
  border-radius: 50%; display: flex; align-items: center;
  justify-content: center; transition: all var(--transition);
  color: var(--text-secondary);
}
.btn-icon:hover { background: rgba(255,255,255,0.08); color: var(--text-primary); }

/* ========== Top Bar ========== */
.topbar {
  height: var(--topbar-height);
  background: var(--bg-elevated);
  border-bottom: 1px solid var(--divider);
  color: var(--text-primary);
  display: flex; align-items: center; padding: 0 20px; gap: 12px;
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
}
.topbar .btn-icon { color: var(--text-secondary); }
.topbar .btn-icon:hover { color: var(--text-primary); background: rgba(255,255,255,0.06); }
.topbar-title {
  flex: 1; font-size: 17px; font-weight: 500; letter-spacing: -0.3px;
  background: linear-gradient(90deg, var(--primary-light), var(--accent));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}
.topbar-actions { display: flex; gap: 4px; }

/* ========== Layout ========== */
.layout {
  display: flex; margin-top: var(--topbar-height);
  min-height: calc(100vh - var(--topbar-height));
}

/* ========== Sidebar ========== */
.sidebar {
  width: var(--sidebar-width);
  background: var(--bg-elevated);
  border-right: 1px solid var(--divider);
  padding: 20px 0;
  position: fixed; top: var(--topbar-height); bottom: 0; left: 0;
  overflow-y: auto; z-index: 50;
  transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}
.sidebar-label {
  padding: 12px 24px 8px; font-size: 11px; font-weight: 600;
  color: var(--text-hint); text-transform: uppercase; letter-spacing: 1.5px;
}
.sidebar-item {
  display: flex; align-items: center; gap: 14px;
  padding: 11px 24px; color: var(--text-secondary);
  text-decoration: none; font-size: 14px; font-weight: 400;
  transition: all var(--transition);
  border-left: 3px solid transparent; margin: 2px 0;
}
.sidebar-item:hover {
  background: rgba(255,255,255,0.04); color: var(--text-primary);
}
.sidebar-item.active {
  color: var(--primary-light);
  background: var(--primary-surface);
  border-left-color: var(--primary);
  font-weight: 500;
}
.sidebar-item .material-icons { font-size: 20px; opacity: 0.8; }
.sidebar-item.active .material-icons { opacity: 1; }

/* ========== Content ========== */
.content {
  flex: 1; margin-left: var(--sidebar-width); padding: 28px;
  max-width: 100%; min-width: 0;
}
.view-header {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 24px; flex-wrap: wrap; gap: 12px;
}
.view-header h3 {
  font-size: 22px; font-weight: 500; color: var(--text-primary);
  letter-spacing: -0.3px;
}

/* ========== Breadcrumb ========== */
.breadcrumb {
  display: flex; align-items: center; gap: 6px; flex-wrap: wrap;
  font-size: 14px;
  background: var(--surface);
  padding: 12px 20px;
  border-radius: var(--radius);
  border: 1px solid var(--divider);
}
.breadcrumb a {
  color: var(--primary-light); text-decoration: none; font-weight: 500;
  transition: color var(--transition);
}
.breadcrumb a:hover { color: var(--accent); }
.breadcrumb .sep { color: var(--text-hint); margin: 0 2px; font-size: 12px; }
.breadcrumb .current { color: var(--text-primary); font-weight: 500; }

/* ========== File List ========== */
.file-list {
  background: var(--surface);
  border-radius: var(--radius); border: 1px solid var(--divider);
  overflow: hidden;
}
.file-entry {
  display: flex; align-items: center; gap: 14px;
  padding: 14px 20px; cursor: pointer;
  transition: background var(--transition);
  border-bottom: 1px solid var(--divider);
}
.file-entry:last-child { border-bottom: none; }
.file-entry:hover { background: var(--surface-hover); }
.file-entry .material-icons { font-size: 22px; }
.file-entry .material-icons.folder { color: #ffd740; }
.file-entry .material-icons.file { color: var(--primary-light); }
.file-entry-name { flex: 1; font-size: 14px; font-weight: 400; color: var(--text-primary); }
.file-entry-meta { font-size: 12px; color: var(--text-hint); font-variant-numeric: tabular-nums; }

/* ========== Editor ========== */
.editor-toolbar {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 20px; flex-wrap: wrap; gap: 12px;
}
.editor-toolbar h3 {
  font-size: 16px; font-weight: 500; color: var(--primary-light);
  display: flex; align-items: center; gap: 8px;
}
.editor-actions { display: flex; gap: 8px; flex-wrap: wrap; }

/* ========== Item Cards ========== */
.items-container { display: grid; gap: 16px; }
.item-card {
  background: var(--surface);
  border-radius: var(--radius);
  border: 1px solid var(--divider);
  overflow: hidden;
  transition: border-color var(--transition), box-shadow var(--transition);
}
.item-card:hover {
  border-color: var(--divider-strong);
  box-shadow: var(--shadow-1);
}
.item-card-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 12px 20px;
  background: var(--surface-2);
  border-bottom: 1px solid var(--divider);
}
.item-card-number {
  font-size: 11px; font-weight: 700; color: var(--primary-light);
  background: var(--primary-surface); padding: 3px 12px; border-radius: 20px;
  letter-spacing: 0.5px;
}
.item-card-actions { display: flex; gap: 6px; }
.item-card-body { padding: 20px; }

.item-field { margin-bottom: 16px; }
.item-field:last-child { margin-bottom: 0; }
.item-field label {
  display: block; font-size: 11px; font-weight: 600;
  color: var(--text-hint); text-transform: uppercase;
  letter-spacing: 1px; margin-bottom: 6px;
}
.item-field input, .item-field textarea {
  width: 100%; padding: 10px 14px;
  border: 1px solid var(--divider-strong);
  border-radius: var(--radius-xs);
  font-family: 'Roboto Mono', 'SF Mono', monospace; font-size: 13px;
  transition: border-color var(--transition), box-shadow var(--transition);
  background: var(--surface-2); color: var(--text-primary);
}
.item-field input:focus, .item-field textarea:focus {
  outline: none; border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(124,77,255,0.12);
}
.item-field input::placeholder, .item-field textarea::placeholder {
  color: var(--text-hint);
}
.item-field textarea { resize: vertical; min-height: 60px; }
.item-field .thumbnail-preview {
  width: 72px; height: 72px; object-fit: cover; border-radius: var(--radius-sm);
  margin-top: 8px; background: var(--surface-3); border: 1px solid var(--divider);
}
.index-thumbnail-preview {
  width: 125px; object-fit: cover; border-radius: var(--radius-sm);
  background: var(--surface-3); border: 1px solid var(--divider);
}
.link-row {
  display: flex; gap: 8px; align-items: center; margin-bottom: 8px;
}
.link-row input { flex: 1; }
.link-row .btn-icon { flex-shrink: 0; }

/* ========== Search ========== */
.search-bar {
  display: flex; align-items: center; gap: 12px;
  background: var(--surface); padding: 14px 20px;
  border-radius: var(--radius); border: 1px solid var(--divider);
  margin-bottom: 24px;
  transition: border-color var(--transition);
}
.search-bar:focus-within {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(124,77,255,0.1);
}
.search-bar .material-icons { color: var(--text-hint); }
.search-bar:focus-within .material-icons { color: var(--primary-light); }
.search-bar input {
  flex: 1; border: none; outline: none; font-size: 15px;
  font-family: inherit; background: transparent; color: var(--text-primary);
}
.search-bar input::placeholder { color: var(--text-hint); }
.search-result-file {
  font-size: 11px; color: var(--primary-light); font-weight: 600;
  padding: 4px 12px; background: var(--primary-surface);
  border-radius: 20px; display: inline-block; margin-bottom: 4px;
  cursor: pointer; letter-spacing: 0.3px;
  transition: all var(--transition);
}
.search-result-file:hover { background: rgba(124,77,255,0.2); }

/* ========== Validation ========== */
.validation-table {
  width: 100%; background: var(--surface);
  border-radius: var(--radius); border: 1px solid var(--divider);
  overflow: hidden; border-collapse: collapse;
}
.validation-table th {
  text-align: left; padding: 14px 20px;
  background: var(--surface-2); font-size: 11px;
  font-weight: 600; color: var(--text-hint);
  text-transform: uppercase; letter-spacing: 1px;
  border-bottom: 1px solid var(--divider);
}
.validation-table td {
  padding: 12px 20px; border-top: 1px solid var(--divider);
  font-size: 13px; color: var(--text-secondary);
}
.validation-table tr:hover td { background: var(--surface-hover); }
.badge {
  display: inline-flex; align-items: center; gap: 4px;
  padding: 4px 12px; border-radius: 20px; font-size: 11px;
  font-weight: 600; letter-spacing: 0.5px;
}
.badge-success { background: var(--success-bg); color: var(--success); }
.badge-error { background: var(--error-bg); color: var(--error); }
.badge-warning { background: var(--warning-bg); color: var(--warning); }
.validation-issues { font-size: 12px; color: var(--warning); margin-top: 6px; line-height: 1.7; }

.validation-summary { display: flex; gap: 16px; margin-bottom: 24px; flex-wrap: wrap; }
.summary-card {
  background: var(--surface); border-radius: var(--radius);
  border: 1px solid var(--divider); padding: 20px 28px;
  text-align: center; min-width: 130px; flex: 1;
  transition: border-color var(--transition);
}
.summary-card:hover { border-color: var(--divider-strong); }
.summary-card .number { font-size: 32px; font-weight: 700; letter-spacing: -1px; }
.summary-card .label {
  font-size: 11px; color: var(--text-hint); text-transform: uppercase;
  letter-spacing: 1px; margin-top: 4px;
}
.summary-card.total .number { color: var(--primary-light); }
.summary-card.valid .number { color: var(--success); }
.summary-card.errors .number { color: var(--error); }

/* ========== Modal ========== */
.modal-overlay {
  position: fixed; inset: 0;
  background: rgba(0,0,0,0.65);
  backdrop-filter: blur(4px);
  display: flex; justify-content: center; align-items: center;
  z-index: 200; padding: 16px;
  animation: fadeIn 0.15s ease-out;
}
@keyframes fadeIn { from { opacity: 0; } }
.modal {
  background: var(--surface); border-radius: 16px;
  width: 100%; max-width: 520px; max-height: 90vh; overflow-y: auto;
  box-shadow: var(--shadow-3); border: 1px solid var(--divider);
  animation: modalSlide 0.2s ease-out;
}
@keyframes modalSlide {
  from { opacity: 0; transform: translateY(12px) scale(0.98); }
}
.modal-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 20px 24px; border-bottom: 1px solid var(--divider);
}
.modal-header h3 { font-size: 18px; font-weight: 500; }
.modal-body { padding: 24px; }
.modal-footer {
  display: flex; justify-content: flex-end; gap: 10px;
  padding: 16px 24px; border-top: 1px solid var(--divider);
}

/* ========== Snackbar ========== */
.snackbar {
  position: fixed; bottom: 28px; left: 50%; transform: translateX(-50%);
  background: var(--surface-3); color: var(--text-primary);
  padding: 14px 28px;
  border-radius: var(--radius-sm); font-size: 14px; z-index: 300;
  box-shadow: var(--shadow-2); animation: snackIn 0.3s ease-out;
  max-width: calc(100% - 32px); border: 1px solid var(--divider);
  font-weight: 400;
}
.snackbar.error { background: var(--error); color: #fff; border-color: transparent; }
.snackbar.success { background: var(--success); color: #0e1117; border-color: transparent; font-weight: 500; }
@keyframes snackIn { from { opacity: 0; transform: translateX(-50%) translateY(16px); } }

/* ========== Loading ========== */
.loading-overlay {
  position: fixed; inset: 0; background: rgba(14,17,23,0.7);
  backdrop-filter: blur(4px);
  display: flex; justify-content: center; align-items: center; z-index: 250;
}
.spinner {
  width: 44px; height: 44px;
  border: 3px solid rgba(124,77,255,0.15);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ========== Empty State ========== */
.empty-state {
  text-align: center; padding: 56px 16px; color: var(--text-hint);
}
.empty-state .material-icons { font-size: 56px; margin-bottom: 12px; opacity: 0.4; }
.empty-state p { font-size: 15px; }

/* ========== Scrollbar ========== */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.1); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: rgba(255,255,255,0.2); }

/* ========== Raw Code Editor ========== */
.raw-editor-wrapper {
  display: flex;
  background: var(--surface);
  border: 1px solid var(--divider);
  border-radius: var(--radius);
  overflow: hidden;
  position: relative;
  height: calc(100vh - 220px);
  min-height: 400px;
}
.line-numbers {
  padding: 16px 0;
  background: var(--surface-2);
  color: var(--text-hint);
  font-family: 'Roboto Mono', 'SF Mono', 'Consolas', monospace;
  font-size: 13px;
  line-height: 1.6;
  text-align: right;
  user-select: none;
  overflow: hidden;
  min-width: 52px;
  border-right: 1px solid var(--divider);
}
.line-numbers .line-num {
  padding: 0 12px 0 8px;
  display: block;
}
.line-numbers .line-num.error-line {
  background: var(--error-bg);
  color: var(--error);
  font-weight: 700;
  position: relative;
}
.line-numbers .line-num.error-line::after {
  content: '';
  position: absolute;
  right: 0; top: 0; bottom: 0;
  width: 2px;
  background: var(--error);
}
.raw-editor-textarea {
  flex: 1;
  padding: 16px;
  background: var(--surface);
  color: var(--text-primary);
  font-family: 'Roboto Mono', 'SF Mono', 'Consolas', monospace;
  font-size: 13px;
  line-height: 1.6;
  border: none;
  outline: none;
  resize: none;
  overflow: auto;
  white-space: pre;
  tab-size: 2;
  -moz-tab-size: 2;
}
.raw-editor-textarea::placeholder { color: var(--text-hint); }
.raw-error-banner {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 20px;
  background: var(--error-bg);
  border: 1px solid rgba(255,82,82,0.25);
  border-radius: var(--radius-sm);
  margin-bottom: 16px;
  color: var(--error);
  font-size: 13px;
  font-weight: 500;
}
.raw-error-banner .material-icons { font-size: 20px; }

/* ========== Validation clickable rows ========== */
.validation-table tr.clickable-row { cursor: pointer; transition: background var(--transition); }
.validation-table tr.clickable-row:hover td { background: var(--error-bg); }

/* ========== Selection ========== */
::selection { background: rgba(124,77,255,0.3); color: #fff; }

/* ========== Responsive ========== */
@media (max-width: 768px) {
  .sidebar { transform: translateX(-100%); }
  .sidebar.open { transform: translateX(0); box-shadow: var(--shadow-3); }
  .content { margin-left: 0; padding: 16px; }
  .editor-toolbar { flex-direction: column; align-items: flex-start; }
  .editor-actions { width: 100%; overflow-x: auto; }
  .editor-actions .btn { flex: 1; justify-content: center; font-size: 10px; padding: 8px 10px; }
  .link-row { flex-direction: column; }
  .link-row input { width: 100%; }
  .search-bar { flex-wrap: wrap; }
  .search-bar input { min-width: 0; }
  .validation-table { font-size: 12px; display: block; overflow-x: auto; }
  .view-header { flex-direction: column; align-items: flex-start; }
  .topbar-title { font-size: 15px; }
  .login-card { padding: 36px 24px; }
  .summary-card { min-width: 100px; padding: 16px; }
  .summary-card .number { font-size: 26px; }
}

/* ========== Login Logo ========== */
.login-logo {
  max-width: 125px; margin: 0 auto 20px; display: block;
}


/* ========== Sidebar overlay on mobile ========== */
.sidebar-backdrop {
  position: fixed; inset: 0; background: rgba(0,0,0,0.5);
  z-index: 40; display: none;
}
.sidebar-backdrop.show { display: block; }

/* ========== Categories View ========== */
.categories-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 16px;
  padding: 4px;
}
.category-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px;
  cursor: pointer;
  transition: all 0.2s;
}
.category-card:hover {
  border-color: var(--primary);
  transform: translateY(-2px);
  box-shadow: 0 4px 20px rgba(124,77,255,0.15);
}
.category-card-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}
.category-card-header .material-icons {
  font-size: 32px;
  color: var(--primary);
}
.category-card-header h4 {
  margin: 0;
  font-size: 16px;
  font-weight: 500;
  color: var(--text);
}
.category-card-meta {
  display: flex;
  gap: 16px;
  font-size: 12px;
  color: var(--text-secondary);
}
.category-card-meta span {
  display: flex;
  align-items: center;
  gap: 4px;
}
.category-card-meta .material-icons {
  font-size: 14px;
}
.cat-status-valid { color: var(--success) !important; }
.cat-status-invalid { color: var(--error) !important; }
.cat-status-missing { color: var(--warning) !important; }
.category-files-list {
  margin-top: 16px;
}
.category-files-list .file-row {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  border-radius: 8px;
  cursor: pointer;
  transition: background 0.15s;
  color: var(--text);
  font-size: 13px;
}
.category-files-list .file-row:hover {
  background: var(--hover);
}
.category-files-list .file-row .material-icons {
  color: var(--primary-light);
  font-size: 18px;
}