:root {
  --bg: #000000;
  --bg-elevated: #1c1c1e;
  --bg-secondary: #2c2c2e;
  --bg-tertiary: #3a3a3c;
  --border: rgba(255, 255, 255, 0.08);
  --text: #f5f5f7;
  --text-secondary: #98989d;
  --accent: #0a84ff;
  --accent-hover: #409cff;
  --gold: #c9a227;
  --danger: #ff453a;
  --ok: #30d158;
  --warning: #ffd60a;
  --sidebar-w: 260px;
  --radius: 12px;
  --radius-lg: 16px;
  --shadow: 0 8px 32px rgba(0, 0, 0, 0.45);
  --glass: rgba(28, 28, 30, 0.72);
  --blur: blur(20px);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
}

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

.glass {
  background: var(--glass);
  backdrop-filter: var(--blur);
  -webkit-backdrop-filter: var(--blur);
  border: 1px solid var(--border);
}

.admin-shell { display: flex; min-height: 100vh; }

.admin-sidebar {
  width: var(--sidebar-w);
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  border-right: 1px solid var(--border);
}

.sidebar-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 20px 16px;
  border-bottom: 1px solid var(--border);
}

.brand-icon {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--gold), #e8c547);
  color: #111;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.85rem;
}

.sidebar-brand h1 { margin: 0; font-size: 1rem; font-weight: 600; }
.sidebar-brand p { margin: 2px 0 0; font-size: 0.75rem; color: var(--text-secondary); }

.nav-section {
  margin: 14px 12px 6px;
  font-size: 0.68rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-secondary);
  opacity: 0.85;
}

.nav-section:first-child { margin-top: 4px; }

.sidebar-nav { flex: 1; overflow-y: auto; padding: 12px 10px; }

.topbar-title-wrap { display: flex; align-items: center; gap: 12px; }

.sidebar-toggle {
  display: none;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  color: var(--text);
  width: 40px;
  height: 40px;
  border-radius: 10px;
  font-size: 1.1rem;
  padding: 0;
  cursor: pointer;
}

.sidebar-nav a {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: 10px;
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-bottom: 2px;
  transition: background 0.15s, color 0.15s;
}

.sidebar-nav a:hover { background: var(--bg-secondary); color: var(--text); text-decoration: none; }
.sidebar-nav a.active { background: rgba(10, 132, 255, 0.15); color: var(--accent); font-weight: 500; }
.nav-icon { width: 18px; text-align: center; opacity: 0.8; font-size: 0.85rem; }

.sidebar-footer {
  padding: 14px 16px;
  border-top: 1px solid var(--border);
  font-size: 0.78rem;
  color: var(--text-secondary);
}

.admin-main { flex: 1; display: flex; flex-direction: column; min-width: 0; }

.admin-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 24px;
  border-bottom: 1px solid var(--border);
}

.admin-topbar h2 { margin: 0; font-size: 1.35rem; font-weight: 600; letter-spacing: -0.02em; }
.subtitle { margin: 4px 0 0; font-size: 0.82rem; color: var(--text-secondary); }

.topbar-actions { display: flex; align-items: center; gap: 12px; }
.user-pill {
  font-size: 0.82rem;
  padding: 6px 12px;
  border-radius: 999px;
  background: var(--bg-secondary);
  color: var(--text-secondary);
}

.admin-content { flex: 1; padding: 24px; overflow-y: auto; }

.panel {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 20px;
  margin-bottom: 16px;
}

.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 16px;
  flex-wrap: wrap;
}

.panel-header h3 { margin: 0; font-size: 1rem; font-weight: 600; }

.toolbar { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 16px; flex-wrap: wrap; }

.hint, .field-hint { color: var(--text-secondary); font-size: 0.85rem; }
.error { color: var(--danger); font-size: 0.9rem; }
.success { color: var(--ok); font-size: 0.9rem; }

.btn, button {
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 10px;
  padding: 9px 16px;
  font-size: 0.88rem;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.15s, transform 0.1s;
}

.btn:hover, button:hover { background: var(--accent-hover); }
.btn:active, button:active { transform: scale(0.98); }
.btn.secondary, button.secondary { background: var(--bg-secondary); color: var(--text); border: 1px solid var(--border); }
.btn.danger, button.danger { background: var(--danger); }
.btn.gold { background: var(--gold); color: #111; }
.btn:disabled { opacity: 0.45; cursor: not-allowed; }

.field { margin-bottom: 14px; }
.field label { display: block; font-size: 0.8rem; color: var(--text-secondary); margin-bottom: 6px; font-weight: 500; }
.field input, .field select, .field textarea {
  width: 100%;
  padding: 10px 12px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--bg-secondary);
  color: var(--text);
  font: inherit;
  font-size: 0.92rem;
}
.field input:focus, .field select:focus, .field textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(10, 132, 255, 0.2);
}
.field textarea { min-height: 88px; resize: vertical; }

.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }

.stat-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; margin-bottom: 16px; }
.stat-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
}
.stat-card span { display: block; font-size: 0.78rem; color: var(--text-secondary); margin-bottom: 8px; }
.stat-card strong { font-size: 1.6rem; font-weight: 600; letter-spacing: -0.03em; }
.stat-card.highlight strong { color: var(--gold); }

table { width: 100%; border-collapse: collapse; font-size: 0.88rem; }
th, td { text-align: left; padding: 12px 10px; border-bottom: 1px solid var(--border); vertical-align: top; }
th { color: var(--text-secondary); font-weight: 500; font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.05em; }
tr:hover td { background: rgba(255,255,255,0.02); }

.table-actions { display: flex; gap: 6px; flex-wrap: wrap; }
.table-actions button { padding: 5px 10px; font-size: 0.78rem; }

.badge {
  display: inline-block;
  font-size: 0.72rem;
  padding: 3px 10px;
  border-radius: 999px;
  border: 1px solid var(--border);
  color: var(--text-secondary);
}
.badge.ok { border-color: rgba(48, 209, 88, 0.35); color: var(--ok); background: rgba(48, 209, 88, 0.1); }
.badge.warn { border-color: rgba(255, 214, 10, 0.35); color: var(--warning); }
.badge.hidden { opacity: 0.6; }

.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.65);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  padding: 20px;
}

.modal {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  width: min(780px, 100%);
  max-height: 90vh;
  overflow-y: auto;
  padding: 24px;
  box-shadow: var(--shadow);
}

.modal h3 { margin: 0 0 18px; font-size: 1.15rem; font-weight: 600; }
.modal-footer { display: flex; justify-content: flex-end; gap: 8px; margin-top: 20px; padding-top: 16px; border-top: 1px solid var(--border); }

.quill-wrap { background: #fff; color: #111; border-radius: var(--radius); min-height: 360px; overflow: hidden; }
.quill-wrap .ql-toolbar { border: none; border-bottom: 1px solid #ddd; }
.quill-wrap .ql-container { border: none; }
.quill-wrap .ql-editor { min-height: 300px; font-size: 1rem; line-height: 1.6; }

.tiptap-mount { min-height: 360px; }
.tiptap-editor {
  background: #fff;
  color: #111;
  border-radius: 0 0 var(--radius) var(--radius);
  min-height: 320px;
  padding: 16px;
  font-size: 1rem;
  line-height: 1.6;
}
.tiptap-editor:focus { outline: none; }
.tiptap-editor table { border-collapse: collapse; width: 100%; margin: 12px 0; }
.tiptap-editor td, .tiptap-editor th { border: 1px solid #ccc; padding: 6px 10px; }
.tiptap-editor img, .tiptap-editor video { max-width: 100%; border-radius: 8px; }
.tiptap-toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  padding: 10px;
  background: var(--bg-secondary);
  border-radius: var(--radius) var(--radius) 0 0;
  border: 1px solid var(--border);
  border-bottom: none;
}
.tiptap-toolbar button, .tiptap-toolbar select, .tiptap-toolbar input[type="color"] {
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 6px;
  padding: 4px 10px;
  cursor: pointer;
  font-size: 0.85rem;
}
.tiptap-toolbar button:hover { background: var(--accent); color: #fff; }

.editor-layout { display: grid; grid-template-columns: 1fr 280px; gap: 16px; }
.editor-sidebar { background: var(--bg-secondary); border-radius: var(--radius); padding: 14px; border: 1px solid var(--border); }
.editor-sidebar h4 { margin: 0 0 10px; font-size: 0.85rem; color: var(--text-secondary); }
.version-item { padding: 8px; border-radius: 8px; margin-bottom: 6px; background: var(--bg-tertiary); font-size: 0.8rem; cursor: pointer; }
.version-item:hover { background: rgba(10,132,255,0.15); }

.media-layout { display: grid; grid-template-columns: 200px 1fr; gap: 16px; }
.folder-list { background: var(--bg-secondary); border-radius: var(--radius); padding: 10px; border: 1px solid var(--border); }
.folder-item { padding: 8px 10px; border-radius: 8px; cursor: pointer; font-size: 0.88rem; color: var(--text-secondary); }
.folder-item.active, .folder-item:hover { background: rgba(10,132,255,0.12); color: var(--accent); }

.media-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); gap: 12px; }
.media-card { background: var(--bg-secondary); border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; transition: transform 0.15s; }
.media-card:hover { transform: translateY(-2px); }
.media-card img, .media-card video { width: 100%; height: 120px; object-fit: cover; display: block; background: var(--bg-tertiary); }
.media-card .media-body { padding: 10px; }
.media-card .media-body p { margin: 0 0 8px; font-size: 0.78rem; word-break: break-all; color: var(--text-secondary); }

.drop-zone {
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 32px;
  text-align: center;
  color: var(--text-secondary);
  margin-bottom: 16px;
  transition: border-color 0.15s, background 0.15s;
}
.drop-zone.dragover { border-color: var(--accent); background: rgba(10,132,255,0.08); color: var(--accent); }

.spec-table { width: 100%; margin-top: 8px; }
.spec-table td { padding: 6px; }
.spec-table input { padding: 6px 8px; font-size: 0.85rem; }

.image-preview-list { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 8px; }
.image-preview-list img { width: 72px; height: 72px; object-fit: cover; border-radius: 8px; border: 1px solid var(--border); }

.flowchart-box { background: var(--bg-secondary); border: 1px solid var(--border); border-radius: var(--radius); padding: 12px; margin-top: 12px; }
.flowchart-box pre { margin: 0; white-space: pre-wrap; font-family: ui-monospace, monospace; font-size: 0.82rem; color: var(--text-secondary); }

.toast {
  position: fixed;
  bottom: 24px;
  right: 24px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 12px 18px;
  box-shadow: var(--shadow);
  z-index: 200;
  font-size: 0.9rem;
}

.search-bar { display: flex; gap: 8px; margin-bottom: 16px; }
.search-bar input { flex: 1; }

.empty-state { text-align: center; padding: 48px 20px; color: var(--text-secondary); }

.login-page { display: flex; align-items: center; justify-content: center; min-height: 100vh; background: radial-gradient(ellipse at top, #1c1c1e 0%, #000 70%); }
.login-shell { width: min(420px, 92vw); }
.login-card { padding: 32px; border-radius: var(--radius-lg); }
.login-brand h1 { margin: 0; font-size: 1.5rem; font-weight: 600; }
.login-brand p { margin: 6px 0 24px; color: var(--text-secondary); }
.btn-primary { width: 100%; padding: 12px; font-size: 1rem; margin-top: 8px; }
.login-links { display: flex; justify-content: space-between; margin-top: 20px; font-size: 0.85rem; }

.rank-list { list-style: none; padding: 0; margin: 0; }
.rank-list li { display: flex; justify-content: space-between; padding: 10px 0; border-bottom: 1px solid var(--border); font-size: 0.9rem; }
.rank-list li span:first-child { color: var(--text-secondary); }

.knowledge-topic-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 10px;
}
.knowledge-topic-card {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 6px;
  text-align: left;
  padding: 14px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--bg-secondary);
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
}
.knowledge-topic-card:hover { border-color: var(--accent); background: var(--bg-elevated); }
.knowledge-topic-card strong { font-size: 0.95rem; }
.knowledge-topic-card .hint { font-size: 0.78rem; line-height: 1.35; }

@media (max-width: 960px) {
  .sidebar-toggle { display: inline-flex; align-items: center; justify-content: center; }
  .admin-sidebar {
    position: fixed;
    inset: 0 auto 0 0;
    z-index: 150;
    width: min(var(--sidebar-w), 88vw);
    transform: translateX(-100%);
    transition: transform 0.22s ease;
    box-shadow: var(--shadow);
  }
  .admin-sidebar.open { transform: translateX(0); }
  .admin-main { width: 100%; }
  .sidebar-nav { display: block; max-height: none; }
  .grid-2, .grid-3, .grid-4, .stat-grid { grid-template-columns: 1fr 1fr; }
  .editor-layout, .media-layout { grid-template-columns: 1fr; }
}

@media (max-width: 560px) {
  .grid-2, .grid-3, .grid-4, .stat-grid { grid-template-columns: 1fr; }
}