/* ==========================================================================
   THEME VARIANTS — Apex Nexus / Nova Bastion
   4 variants applied via <html data-theme="...">
   Each overrides :root CSS variables from theme.css.
   ========================================================================== */

/* ---------- Void Dark (default dark) — base theme, minimal overrides ------ */
[data-theme="void-dark"] {
  --bg:          #060a12;
  --bg-subtle:   #0a0e18;
  --panel:       #0d1220;
  --panel-hover: #131b2e;
  --border:      #1a2536;
  --border-light:#151f30;
  --text:        #e2e8f0;
  --text-bright: #f1f5f9;
  --accent:      #06d6a0;
  --accent2:     #38bdf8;
}

/* ---------- Nebula Dark — warmer purples + magenta accent --------------- */
[data-theme="nebula-dark"] {
  --bg:          #0c0818;
  --bg-subtle:   #100c1f;
  --panel:       #160f28;
  --panel-hover: #1e1535;
  --border:      #2a1f45;
  --border-light:#221a3a;
  --text:        #e0daf0;
  --text-bright: #f3f0fa;
  --muted:       #7b6f9a;
  --accent:      #c084fc;
  --accent-dim:  #c084fc33;
  --accent2:     #f472b6;
  --accent2-dim: #f472b633;
  --glow-accent: 0 0 20px #c084fc33;
  --danger:      #fb7185;
  --warn:        #fbbf24;
  --ok:          #34d399;
}

/* ---------- Aurora Light — clean light with teal accent ----------------- */
[data-theme="aurora-light"] {
  --bg:          #f8fafc;
  --bg-subtle:   #f1f5f9;
  --panel:       #ffffff;
  --panel-hover: #f0fdf4;
  --border:      #d1d5db;
  --border-light:#e5e7eb;
  --text:        #1e293b;
  --text-bright: #0f172a;
  --muted:       #64748b;
  --accent:      #059669;
  --accent-dim:  #05966933;
  --accent2:     #0284c7;
  --accent2-dim: #0284c733;
  --glow-accent: 0 0 12px #05966922;
  --danger:      #dc2626;
  --danger-dim:  #dc262622;
  --warn:        #d97706;
  --warn-dim:    #d9770622;
  --ok:          #16a34a;
  --ok-dim:      #16a34a22;
  --shadow:      0 2px 8px rgba(0,0,0,.08);
  --shadow-lg:   0 8px 32px rgba(0,0,0,.12);
}

[data-theme="aurora-light"] body {
  background-image: none;
}

[data-theme="aurora-light"] .card,
[data-theme="aurora-light"] .panel,
[data-theme="aurora-light"] .learn-library-card,
[data-theme="aurora-light"] article.card {
  background: rgba(255, 255, 255, 0.85) !important;
  backdrop-filter: blur(8px);
  border-color: rgba(0, 0, 0, 0.08) !important;
  box-shadow: 0 1px 4px rgba(0,0,0,0.05);
}

[data-theme="aurora-light"] #nx-immersive-bg {
  background:
    radial-gradient(ellipse 120% 80% at 30% 20%, rgba(5, 150, 105, 0.04) 0%, transparent 60%),
    radial-gradient(ellipse 100% 70% at 75% 70%, rgba(2, 132, 199, 0.04) 0%, transparent 55%),
    linear-gradient(160deg, #f8fafc 0%, #f1f5f9 40%, #ecfdf5 100%);
}

[data-theme="aurora-light"] #nx-immersive-bg::before {
  opacity: 0.04;
}

[data-theme="aurora-light"] #nx-nova-panel {
  background: rgba(255, 255, 255, 0.95);
  border-left-color: rgba(5, 150, 105, 0.15);
}

[data-theme="aurora-light"] .nx-panel__title {
  color: #0284c7;
}

[data-theme="aurora-light"] .nav {
  background: rgba(255, 255, 255, 0.9);
  border-bottom-color: rgba(0, 0, 0, 0.08);
}

[data-theme="aurora-light"] ::-webkit-scrollbar-track {
  background: #f1f5f9;
}

[data-theme="aurora-light"] ::-webkit-scrollbar-thumb {
  background: #cbd5e1;
}

/* ---------- Solar Light — warm gold accent on cream --------------------- */
[data-theme="solar-light"] {
  --bg:          #fffbf0;
  --bg-subtle:   #fef7e8;
  --panel:       #ffffff;
  --panel-hover: #fefce8;
  --border:      #ddd6c0;
  --border-light:#e8e2d0;
  --text:        #292524;
  --text-bright: #1c1917;
  --muted:       #78716c;
  --accent:      #b45309;
  --accent-dim:  #b4530933;
  --accent2:     #0369a1;
  --accent2-dim: #0369a133;
  --glow-accent: 0 0 12px #b4530922;
  --danger:      #dc2626;
  --warn:        #ca8a04;
  --ok:          #15803d;
  --shadow:      0 2px 8px rgba(0,0,0,.06);
  --shadow-lg:   0 8px 32px rgba(0,0,0,.10);
}

[data-theme="solar-light"] body {
  background-image: none;
}

[data-theme="solar-light"] .card,
[data-theme="solar-light"] .panel,
[data-theme="solar-light"] .learn-library-card,
[data-theme="solar-light"] article.card {
  background: rgba(255, 255, 255, 0.88) !important;
  backdrop-filter: blur(8px);
  border-color: rgba(0, 0, 0, 0.07) !important;
  box-shadow: 0 1px 4px rgba(0,0,0,0.04);
}

[data-theme="solar-light"] #nx-immersive-bg {
  background:
    radial-gradient(ellipse 120% 80% at 30% 20%, rgba(180, 83, 9, 0.03) 0%, transparent 60%),
    radial-gradient(ellipse 100% 70% at 75% 70%, rgba(3, 105, 161, 0.03) 0%, transparent 55%),
    linear-gradient(160deg, #fffbf0 0%, #fef7e8 40%, #fefce8 100%);
}

[data-theme="solar-light"] #nx-immersive-bg::before {
  opacity: 0.03;
}

[data-theme="solar-light"] #nx-nova-panel {
  background: rgba(255, 251, 240, 0.96);
  border-left-color: rgba(180, 83, 9, 0.15);
}

[data-theme="solar-light"] .nx-panel__title {
  color: #b45309;
}

[data-theme="solar-light"] .nav {
  background: rgba(255, 251, 240, 0.92);
  border-bottom-color: rgba(0, 0, 0, 0.06);
}

[data-theme="solar-light"] ::-webkit-scrollbar-track {
  background: #fef7e8;
}

[data-theme="solar-light"] ::-webkit-scrollbar-thumb {
  background: #d6d3c8;
}

/* ---------- Theme switcher in Nova panel ------------------------------ */
.nx-theme-switcher {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.4rem;
}

.nx-theme-btn {
  padding: 0.5rem 0.6rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--text);
  cursor: pointer;
  font-size: 0.75rem;
  font-weight: 600;
  text-align: center;
  transition: border-color 0.2s, box-shadow 0.2s, background 0.2s;
}

.nx-theme-btn:hover {
  border-color: var(--accent);
  box-shadow: 0 0 8px var(--accent-dim);
}

.nx-theme-btn.is-active {
  border-color: var(--accent);
  background: var(--accent-dim);
  color: var(--accent);
}

/* Swatch circles */
.nx-theme-btn__swatch {
  display: inline-block;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  margin-right: 0.3rem;
  vertical-align: middle;
  border: 1px solid rgba(255,255,255,0.1);
}

/* ---------- Feedback popup --------------------------------------------- */
.nx-feedback-overlay {
  position: fixed;
  inset: 0;
  z-index: 9700;
  background: rgba(0, 0, 0, 0.4);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease;
}

.nx-feedback-overlay.is-open {
  opacity: 1;
  pointer-events: auto;
}

.nx-feedback-popup {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 1.5rem;
  max-width: 360px;
  width: 92%;
  box-shadow: var(--shadow-lg);
}

.nx-feedback__title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-bright);
  margin-bottom: 0.25rem;
}

.nx-feedback__question {
  font-size: 0.85rem;
  color: var(--muted);
  margin-bottom: 0.75rem;
  line-height: 1.4;
}

.nx-feedback__stars {
  display: flex;
  gap: 0.35rem;
  margin-bottom: 0.75rem;
}

.nx-star-btn {
  background: none;
  border: none;
  cursor: pointer;
  font-size: 1.5rem;
  color: var(--border);
  transition: color 0.15s, transform 0.15s;
  padding: 0;
  line-height: 1;
}

.nx-star-btn:hover,
.nx-star-btn.is-active {
  color: #fbbf24;
  transform: scale(1.15);
}

.nx-feedback__comment {
  width: 100%;
  padding: 0.5rem 0.65rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg-subtle);
  color: var(--text);
  font-size: 0.82rem;
  font-family: var(--font);
  resize: none;
  margin-bottom: 0.75rem;
}

.nx-feedback__comment:focus {
  outline: none;
  border-color: var(--accent);
}

.nx-feedback__actions {
  display: flex;
  gap: 0.5rem;
  justify-content: flex-end;
}

/* ---------- Language selector in Nova panel ----------------------------- */
.nx-lang-selector {
  display: flex;
  gap: 0.35rem;
  flex-wrap: wrap;
}

.nx-lang-btn {
  padding: 0.35rem 0.65rem;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--text);
  cursor: pointer;
  font-size: 0.75rem;
  font-weight: 600;
  transition: border-color 0.2s, background 0.2s;
}

.nx-lang-btn:hover {
  border-color: var(--accent);
}

.nx-lang-btn.is-active {
  border-color: var(--accent);
  background: var(--accent-dim);
  color: var(--accent);
}

/* ========================================================================
   Auto Language V1 — Toast Notification
   ======================================================================== */

#apex-toast-root {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  z-index: 9200;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  pointer-events: none;
}

.apex-lang-toast {
  pointer-events: auto;
  display: flex;
  align-items: flex-start;
  gap: 0.6rem;
  background: var(--panel, #1a1e2e);
  border: 1px solid var(--accent, #6366f1);
  border-radius: 10px;
  padding: 0.85rem 1rem;
  box-shadow: 0 8px 28px rgba(0, 0, 0, 0.35);
  max-width: 360px;
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.3s ease, transform 0.3s ease;
}

.apex-lang-toast.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.apex-lang-toast__body {
  flex: 1;
}

.apex-lang-toast__text {
  font-size: 0.85rem;
  color: var(--text, #e2e8f0);
  margin-bottom: 0.55rem;
  display: block;
}

.apex-lang-toast__actions {
  display: flex;
  gap: 0.45rem;
  flex-wrap: wrap;
}

.apex-lang-toast__btn {
  border: 1px solid var(--border, #2d3348);
  background: transparent;
  color: var(--text, #e2e8f0);
  border-radius: 6px;
  padding: 0.3rem 0.65rem;
  cursor: pointer;
  font-size: 0.78rem;
  font-weight: 600;
  transition: background 0.2s;
}

.apex-lang-toast__btn:hover {
  background: var(--accent-dim, rgba(99, 102, 241, 0.15));
}

.apex-lang-toast__confirm {
  border-color: var(--accent, #6366f1);
  color: var(--accent, #6366f1);
}

.apex-lang-toast__close {
  background: none;
  border: none;
  color: var(--muted, #64748b);
  font-size: 1.15rem;
  cursor: pointer;
  padding: 0;
  line-height: 1;
}

.apex-lang-toast__close:hover {
  color: var(--text, #e2e8f0);
}

.apex-lang-toast__selector {
  display: flex;
  gap: 0.35rem;
  flex-wrap: wrap;
  margin-top: 0.45rem;
}

.apex-lang-toast__lang-btn {
  border: 1px solid var(--border, #2d3348);
  background: transparent;
  color: var(--text, #e2e8f0);
  border-radius: 6px;
  padding: 0.25rem 0.55rem;
  cursor: pointer;
  font-size: 0.78rem;
  font-weight: 600;
  transition: border-color 0.2s, background 0.2s;
}

.apex-lang-toast__lang-btn:hover {
  border-color: var(--accent, #6366f1);
  background: var(--accent-dim, rgba(99, 102, 241, 0.15));
}

/* ---------- Reduced motion ----------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  .nx-feedback-overlay,
  .nx-theme-btn,
  .nx-lang-btn,
  .nx-star-btn,
  .apex-lang-toast {
    transition: none;
  }
}
