/* ================================================================
   GlaceLearn — Premium White Theme Design System
   Clean • Modern • Professional | Like Notion × Stripe × Linear
   ================================================================ */

/* ---- GOOGLE FONTS ---- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&family=Plus+Jakarta+Sans:wght@400;500;600;700;800&display=swap');

/* ---- CSS CUSTOM PROPERTIES ---- */
:root {
  /* Brand Colors */
  --primary:        #6366f1;   /* Indigo */
  --primary-light:  #818cf8;
  --primary-dark:   #4f46e5;
  --secondary:      #0ea5e9;   /* Sky Blue */
  --accent:         #f43f5e;   /* Rose */
  --success:        #10b981;
  --warning:        #f59e0b;

  /* Neutral Palette */
  --bg:             #f8fafc;   /* Slate-50 — page background */
  --bg-alt:         #f1f5f9;   /* Slate-100 */
  --surface:        #ffffff;   /* Card surface */
  --surface-2:      #f8fafc;
  --border:         #e2e8f0;   /* Slate-200 */
  --border-strong:  #cbd5e1;   /* Slate-300 */

  /* Text */
  --text-heading:   #0f172a;   /* Slate-900 */
  --text-body:      #334155;   /* Slate-700 */
  --text-muted:     #64748b;   /* Slate-500 */
  --text-faint:     #94a3b8;   /* Slate-400 */

  /* Shadows */
  --shadow-xs:  0 1px 2px rgba(15,23,42,.05);
  --shadow-sm:  0 2px 8px rgba(15,23,42,.08);
  --shadow-md:  0 4px 20px rgba(15,23,42,.10);
  --shadow-lg:  0 8px 40px rgba(15,23,42,.12);
  --shadow-xl:  0 20px 60px rgba(15,23,42,.15);
  --shadow-color: 0 8px 24px rgba(99,102,241,.18);

  /* Radius */
  --radius-sm:  8px;
  --radius-md:  12px;
  --radius-lg:  16px;
  --radius-xl:  20px;
  --radius-2xl: 24px;

  /* Transitions */
  --transition: all .22s cubic-bezier(.4,0,.2,1);
  --transition-slow: all .4s cubic-bezier(.4,0,.2,1);

  /* Typography */
  --font-sans: 'Plus Jakarta Sans', 'Inter', system-ui, sans-serif;
}

/* ================================================================
   RESET & BASE
   ================================================================ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-sans);
  background-color: var(--bg);
  color: var(--text-body);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

/* ================================================================
   TYPOGRAPHY
   ================================================================ */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-sans);
  color: var(--text-heading);
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.02em;
}

.gradient-text {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.gradient-text-warm {
  background: linear-gradient(135deg, #f43f5e, #f97316);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ================================================================
   CARDS & SURFACES
   ================================================================ */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.card-hover:hover {
  border-color: var(--border-strong);
  box-shadow: var(--shadow-md);
  transform: translateY(-3px);
}

.card-interactive:hover {
  border-color: rgba(99,102,241,.35);
  box-shadow: 0 8px 30px rgba(99,102,241,.1);
  transform: translateY(-4px);
}

/* Glass-effect card (light version) */
.glass-panel {
  background: rgba(255,255,255,.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid rgba(255,255,255,.9);
  box-shadow: var(--shadow-md);
  border-radius: var(--radius-xl);
}

.glass-panel-hover:hover {
  border-color: rgba(99,102,241,.3);
  box-shadow: 0 8px 30px rgba(99,102,241,.1);
  transform: translateY(-3px);
}

/* ================================================================
   BUTTONS
   ================================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 14px;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: var(--transition);
  text-decoration: none;
  white-space: nowrap;
  padding: 10px 20px;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: #fff;
  box-shadow: 0 4px 14px rgba(99,102,241,.35);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(99,102,241,.45);
}
.btn-primary:active { transform: translateY(0); }

.btn-secondary {
  background: var(--surface);
  color: var(--text-body);
  border: 1.5px solid var(--border);
  box-shadow: var(--shadow-xs);
}
.btn-secondary:hover {
  background: var(--bg-alt);
  border-color: var(--border-strong);
  color: var(--text-heading);
}

.btn-ghost {
  background: transparent;
  color: var(--text-muted);
  border: 1.5px solid var(--border);
}
.btn-ghost:hover {
  background: var(--bg-alt);
  color: var(--text-body);
}

.btn-danger {
  background: rgba(244,63,94,.08);
  color: #e11d48;
  border: 1.5px solid rgba(244,63,94,.2);
}
.btn-danger:hover { background: rgba(244,63,94,.14); }

/* ================================================================
   FORM ELEMENTS
   ================================================================ */
.input {
  width: 100%;
  background: var(--surface);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-md);
  color: var(--text-heading);
  padding: 11px 16px;
  font-size: 14px;
  font-family: var(--font-sans);
  transition: var(--transition);
  outline: none;
  box-shadow: var(--shadow-xs);
}
.input::placeholder { color: var(--text-faint); }
.input:hover { border-color: var(--border-strong); }
.input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(99,102,241,.12);
}

.select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%2364748b' stroke-width='2'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 36px;
}

/* ================================================================
   BADGES & TAGS
   ================================================================ */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 3px 10px;
  border-radius: 999px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .01em;
}
.badge-primary   { background: rgba(99,102,241,.1); color: var(--primary-dark); border: 1px solid rgba(99,102,241,.2); }
.badge-secondary { background: rgba(14,165,233,.1); color: #0369a1; border: 1px solid rgba(14,165,233,.2); }
.badge-success   { background: rgba(16,185,129,.1); color: #047857; border: 1px solid rgba(16,185,129,.2); }
.badge-warning   { background: rgba(245,158,11,.1); color: #92400e; border: 1px solid rgba(245,158,11,.2); }
.badge-danger    { background: rgba(244,63,94,.1);  color: #be123c;  border: 1px solid rgba(244,63,94,.2);  }

/* ================================================================
   NAVBAR
   ================================================================ */
.navbar {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255,255,255,.92);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow-xs);
}

.nav-link {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-muted);
  text-decoration: none;
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  transition: var(--transition);
}
.nav-link:hover {
  color: var(--text-heading);
  background: var(--bg-alt);
}
.nav-link.active {
  color: var(--primary);
  background: rgba(99,102,241,.08);
}

/* ================================================================
   STAT CARDS (Dashboard)
   ================================================================ */
.stat-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: 22px 24px;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}
.stat-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  border-radius: var(--radius-xl) var(--radius-xl) 0 0;
  transition: opacity .3s;
  opacity: 0;
}
.stat-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.stat-card:hover::before { opacity: 1; }
.stat-card.purple::before { background: linear-gradient(90deg, #6366f1, #818cf8); }
.stat-card.blue::before   { background: linear-gradient(90deg, #0ea5e9, #38bdf8); }
.stat-card.green::before  { background: linear-gradient(90deg, #10b981, #34d399); }
.stat-card.orange::before { background: linear-gradient(90deg, #f97316, #fb923c); }

.stat-icon {
  width: 44px; height: 44px;
  border-radius: var(--radius-md);
  display: flex; align-items: center; justify-content: center;
  font-size: 20px;
  margin-bottom: 14px;
}
.stat-icon.purple { background: rgba(99,102,241,.1); }
.stat-icon.blue   { background: rgba(14,165,233,.1); }
.stat-icon.green  { background: rgba(16,185,129,.1); }
.stat-icon.orange { background: rgba(249,115,22,.1); }

.stat-number {
  font-size: 30px;
  font-weight: 900;
  color: var(--text-heading);
  letter-spacing: -0.03em;
  line-height: 1;
}
.stat-label {
  font-size: 13px;
  color: var(--text-muted);
  font-weight: 600;
  margin-top: 4px;
}

/* ================================================================
   TABLE STYLES
   ================================================================ */
.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}
.data-table thead tr {
  background: var(--bg-alt);
  border-bottom: 1px solid var(--border);
}
.data-table thead th {
  padding: 10px 16px;
  text-align: left;
  font-size: 11px;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: .06em;
}
.data-table tbody tr {
  border-bottom: 1px solid var(--border);
  transition: background .15s;
}
.data-table tbody tr:last-child { border-bottom: none; }
.data-table tbody tr:hover { background: var(--bg-alt); }
.data-table tbody td { padding: 12px 16px; color: var(--text-body); vertical-align: middle; }

/* ================================================================
   NODE TIMELINE (Learning Path)
   ================================================================ */
.node-timeline {
  display: flex;
  align-items: flex-start;
  gap: 0;
  overflow-x: auto;
  padding: 20px 4px 24px;
  scrollbar-width: thin;
  scrollbar-color: var(--border-strong) transparent;
}
.node-timeline::-webkit-scrollbar { height: 4px; }
.node-timeline::-webkit-scrollbar-thumb { background: var(--border-strong); border-radius: 9999px; }

.timeline-node {
  display: flex;
  flex-direction: column;
  align-items: center;
  position: relative;
  min-width: 155px;
  animation: nodeUnlock .5s cubic-bezier(.4,0,.2,1) forwards;
  opacity: 0;
}
.timeline-node:not(:last-child)::after {
  content: '';
  position: absolute;
  top: 22px;
  left: calc(50% + 22px);
  width: calc(100% - 44px);
  height: 2px;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  opacity: .35;
}
.timeline-node.locked:not(:last-child)::after { background: var(--border); opacity: 1; }

.node-circle {
  width: 44px; height: 44px;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-weight: 900; font-size: 15px;
  border: 2px solid rgba(99,102,241,.4);
  background: rgba(99,102,241,.08);
  color: var(--primary);
  position: relative; z-index: 1;
  box-shadow: 0 0 0 4px rgba(99,102,241,.08);
  transition: var(--transition);
}
.timeline-node:hover .node-circle { transform: scale(1.12); box-shadow: 0 0 0 6px rgba(99,102,241,.12), var(--shadow-color); }
.timeline-node.locked .node-circle {
  border-color: var(--border);
  background: var(--bg-alt);
  box-shadow: none;
  color: var(--text-faint);
}

.node-card {
  margin-top: 12px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 12px;
  text-align: center;
  width: 135px;
  box-shadow: var(--shadow-xs);
  position: relative;
}
.timeline-node.locked .node-card { filter: blur(1.5px); pointer-events: none; }
.lock-overlay {
  position: absolute; inset: 0;
  display: flex; align-items: center; justify-content: center;
  background: rgba(248,250,252,.85);
  border-radius: var(--radius-md);
  font-size: 18px;
  backdrop-filter: blur(2px);
}

/* ================================================================
   FLIP FLASHCARDS
   ================================================================ */
.flip-card { width: 160px; height: 100px; perspective: 700px; cursor: pointer; }
.flip-card-inner {
  width: 100%; height: 100%;
  position: relative;
  transform-style: preserve-3d;
  transition: transform .55s cubic-bezier(.4,0,.2,1);
}
.flip-card:hover .flip-card-inner { transform: rotateY(180deg); }
.flip-card-front, .flip-card-back {
  position: absolute; inset: 0;
  border-radius: var(--radius-md);
  display: flex; align-items: center; justify-content: center;
  padding: 10px; text-align: center;
  font-size: 12px; font-weight: 700;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
}
.flip-card-front { background: rgba(99,102,241,.06); border: 1.5px solid rgba(99,102,241,.2); color: var(--primary-dark); }
.flip-card-back  { background: rgba(14,165,233,.06); border: 1.5px solid rgba(14,165,233,.2); color: #0369a1; transform: rotateY(180deg); }

/* ================================================================
   LEADERBOARD
   ================================================================ */
.leaderboard-row {
  display: flex; align-items: center; gap: 12px;
  padding: 12px 16px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  background: var(--surface);
  transition: var(--transition);
  margin-bottom: 8px;
}
.leaderboard-row:hover { background: var(--bg-alt); border-color: var(--border-strong); }
.leaderboard-row.current-user {
  background: rgba(99,102,241,.05);
  border-color: rgba(99,102,241,.3);
  box-shadow: 0 0 0 3px rgba(99,102,241,.06);
}
.xp-bar-wrap { flex: 1; height: 6px; background: var(--bg-alt); border-radius: 999px; overflow: hidden; }
.xp-bar-fill  { height: 100%; border-radius: 999px; background: linear-gradient(90deg, var(--primary), var(--secondary)); transition: width 1s ease; }

/* ================================================================
   SIDEBAR
   ================================================================ */
.sidebar {
  background: var(--surface);
  border-right: 1px solid var(--border);
  width: 220px;
  flex-shrink: 0;
}
.sidebar-link {
  display: flex; align-items: center; gap: 10px;
  padding: 9px 14px;
  border-radius: var(--radius-md);
  font-size: 13px; font-weight: 600;
  color: var(--text-muted);
  text-decoration: none;
  transition: var(--transition);
  margin-bottom: 2px;
}
.sidebar-link:hover { background: var(--bg-alt); color: var(--text-heading); }
.sidebar-link.active { background: rgba(99,102,241,.08); color: var(--primary); }

/* ================================================================
   CUSTOM SCROLLBAR (Light)
   ================================================================ */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: var(--bg-alt); }
::-webkit-scrollbar-thumb { background: var(--border-strong); border-radius: 9999px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-faint); }

/* ================================================================
   ALERTS
   ================================================================ */
.alert {
  padding: 12px 16px;
  border-radius: var(--radius-md);
  font-size: 13px;
  font-weight: 600;
  display: flex; align-items: center; gap: 10px;
  border: 1px solid;
}
.alert-error   { background: rgba(244,63,94,.06);  border-color: rgba(244,63,94,.2);  color: #be123c; }
.alert-success { background: rgba(16,185,129,.06); border-color: rgba(16,185,129,.2); color: #047857; }
.alert-info    { background: rgba(99,102,241,.06); border-color: rgba(99,102,241,.2); color: var(--primary-dark); }
.alert-warning { background: rgba(245,158,11,.06); border-color: rgba(245,158,11,.2); color: #92400e; }

/* ================================================================
   DIVIDERS & HELPERS
   ================================================================ */
.divider {
  display: flex; align-items: center; gap: 12px;
  color: var(--text-faint); font-size: 12px; font-weight: 600;
  text-transform: uppercase; letter-spacing: .06em;
}
.divider::before, .divider::after { content: ''; flex: 1; height: 1px; background: var(--border); }

/* ================================================================
   SECTION BACKGROUNDS
   ================================================================ */
.section-alt { background: var(--bg-alt); }
.section-gradient {
  background: linear-gradient(135deg, rgba(99,102,241,.04) 0%, rgba(14,165,233,.04) 100%);
}
.hero-gradient {
  background: linear-gradient(135deg,
    rgba(99,102,241,.07) 0%,
    rgba(255,255,255,1) 45%,
    rgba(14,165,233,.05) 100%);
}

/* ================================================================
   WHITEBOARD
   ================================================================ */
.whiteboard-canvas {
  touch-action: none;
  cursor: crosshair;
  background: #ffffff;
  border-radius: 0 0 var(--radius-md) var(--radius-md);
  border: 1px solid var(--border);
}
.whiteboard-toolbar {
  display: flex; align-items: center; gap: 8px;
  padding: 8px 14px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-bottom: none;
  border-radius: var(--radius-md) var(--radius-md) 0 0;
}
.wb-tool-btn {
  padding: 5px 11px; border-radius: var(--radius-sm);
  font-size: 12px; font-weight: 700; cursor: pointer;
  border: 1.5px solid var(--border);
  background: var(--surface); color: var(--text-muted);
  transition: var(--transition);
}
.wb-tool-btn:hover, .wb-tool-btn.active {
  background: rgba(99,102,241,.08);
  border-color: rgba(99,102,241,.3);
  color: var(--primary);
}

/* ================================================================
   XP & GAMIFICATION
   ================================================================ */
@keyframes float-bubble {
  0%   { transform: translateY(0) scale(1); opacity: 1; }
  100% { transform: translateY(-80px) scale(1.2); opacity: 0; }
}
.xp-bubble {
  animation: float-bubble 1.5s forwards cubic-bezier(.075,.82,.165,1);
  pointer-events: none;
  font-weight: 900; font-size: 15px; color: var(--primary);
  text-shadow: 0 2px 8px rgba(99,102,241,.3);
}

.attendance-badge {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 4px 12px; border-radius: 999px;
  font-size: 11px; font-weight: 800;
  background: rgba(16,185,129,.08);
  border: 1px solid rgba(16,185,129,.3);
  color: #047857;
}
.attendance-dot {
  width: 7px; height: 7px; border-radius: 50%;
  background: #10b981;
  animation: attendance-ping 1.5s ease-in-out infinite;
}
@keyframes attendance-ping {
  0%, 100% { transform: scale(1); opacity: 1; }
  50%       { transform: scale(1.4); opacity: .6; }
}

/* ================================================================
   MATCH SCORE CIRCLE
   ================================================================ */
.match-score-circle {
  position: relative; width: 70px; height: 70px;
  display: flex; align-items: center; justify-content: center;
}
.match-score-circle svg { position: absolute; inset: 0; transform: rotate(-90deg); }
.match-score-circle .score-text {
  font-size: 14px; font-weight: 900; position: relative; z-index: 1;
  color: var(--primary);
}

/* ================================================================
   KEYFRAME ANIMATIONS
   ================================================================ */
@keyframes nodeUnlock {
  from { opacity: 0; transform: translateY(16px) scale(.94); }
  to   { opacity: 1; transform: translateY(0) scale(1); }
}
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(24px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes fadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}
@keyframes shimmer {
  0%   { transform: translateX(-100%); }
  100% { transform: translateX(100%); }
}
@keyframes confettiFall {
  0%   { transform: translateY(-20px) rotate(0deg); opacity: 1; }
  100% { transform: translateY(100vh) rotate(720deg); opacity: 0; }
}
@keyframes spin { to { transform: rotate(360deg); } }
@keyframes pulse-ring {
  0%, 100% { box-shadow: 0 0 0 0 rgba(99,102,241,.0); }
  50%       { box-shadow: 0 0 0 8px rgba(99,102,241,.1); }
}
@keyframes borderGlow {
  0%,100% { border-color: rgba(99,102,241,.2); }
  50%      { border-color: rgba(14,165,233,.5); }
}

.animate-fade-up        { animation: fadeUp .6s cubic-bezier(.4,0,.2,1) forwards; }
.animate-fade-in        { animation: fadeIn .4s ease forwards; }
.animate-pulse-ring     { animation: pulse-ring 3s ease-in-out infinite; }
.animate-border-glow    { animation: borderGlow 4s ease-in-out infinite; }
.confetti-piece         { animation: confettiFall 2s linear forwards; }
.spinner                { animation: spin .7s linear infinite; border-radius: 50%; border: 2px solid rgba(99,102,241,.2); border-top-color: var(--primary); }

/* Shimmer loading */
.shimmer {
  position: relative; overflow: hidden;
  background: linear-gradient(90deg, var(--bg-alt) 25%, #ffffff 50%, var(--bg-alt) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.6s infinite;
}

/* ================================================================
   UTILITY CLASSES
   ================================================================ */
.truncate-2 { overflow: hidden; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; }
.surface-raised { background: var(--surface); box-shadow: var(--shadow-md); }
.border-subtle  { border: 1px solid var(--border); }
.text-heading   { color: var(--text-heading); }
.text-body      { color: var(--text-body); }
.text-muted-gl  { color: var(--text-muted); }
.text-faint     { color: var(--text-faint); }
.rounded-full-custom { border-radius: 9999px; }

/* ================================================================
   NOTIFICATION TOASTS
   ================================================================ */
.gl-toast {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  padding: 14px 18px;
  display: flex; align-items: center; gap: 12px;
  min-width: 260px; max-width: 360px;
  font-size: 13px; font-weight: 600;
  color: var(--text-body);
  animation: fadeUp .35s cubic-bezier(.4,0,.2,1) forwards;
  pointer-events: auto;
}
.gl-toast.success { border-left: 3px solid var(--success); }
.gl-toast.error   { border-left: 3px solid var(--accent); }
.gl-toast.info    { border-left: 3px solid var(--primary); }
.gl-toast.warning { border-left: 3px solid var(--warning); }

/* ================================================================
   PROGRESS RING (XP)
   ================================================================ */
.progress-ring-svg { transform: rotate(-90deg); }
.progress-ring-track { fill: none; stroke: var(--border); stroke-width: 6; }
.progress-ring-fill  { fill: none; stroke-width: 6; stroke-linecap: round; transition: stroke-dashoffset 1.2s cubic-bezier(.4,0,.2,1); }

/* ================================================================
   NEON-GRADIENT BG OVERRIDE (legacy compat)
   ================================================================ */
.neon-gradient-bg { background: var(--bg); }