/* ============================================
   AI研修 - ライトテーマ スタイルシート
   style.css (ダークテーマ) の上書き用
   ============================================ */

/* ---------- CSS Custom Properties (Light) ---------- */
:root[data-theme="light"] {
  /* Colors - Warm, friendly light palette */
  --bg-primary: #f5f3f0;
  --bg-secondary: #ffffff;
  --bg-card: rgba(255, 255, 255, 0.85);
  --bg-card-hover: rgba(255, 255, 255, 0.95);
  --bg-glass: rgba(255, 255, 255, 0.7);
  --border-glass: rgba(0, 0, 0, 0.08);
  --text-primary: #1a1a2e;
  --text-secondary: #4a4a68;
  --text-muted: #8888a0;
  --accent-1: #5b5fc7;
  --accent-2: #7c6fe0;
  --accent-3: #6d5fcc;
  --accent-gradient: linear-gradient(135deg, #5b5fc7, #7c6fe0, #9b8ce8);
  --accent-glow: rgba(91, 95, 199, 0.15);
}

/* ---------- Body ---------- */
:root[data-theme="light"] body {
  background-color: var(--bg-primary);
  color: var(--text-primary);
}

/* ---------- Header ---------- */
:root[data-theme="light"] .site-header {
  background: rgba(255, 255, 255, 0.82);
  border-bottom-color: rgba(0, 0, 0, 0.06);
}

:root[data-theme="light"] .site-header.scrolled {
  background: rgba(255, 255, 255, 0.95);
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.06);
}

:root[data-theme="light"] .logo-text {
  color: var(--text-primary);
}

:root[data-theme="light"] .nav-link {
  color: var(--text-secondary);
}

:root[data-theme="light"] .nav-link:hover {
  color: var(--text-primary);
}

:root[data-theme="light"] .youtube-link {
  background: rgba(91, 95, 199, 0.06);
  border-color: rgba(91, 95, 199, 0.15);
}

/* ---------- Hero Section ---------- */
:root[data-theme="light"] .hero-bg {
  background:
    radial-gradient(ellipse 80% 60% at 50% 40%, rgba(91, 95, 199, 0.1), transparent),
    radial-gradient(ellipse 60% 50% at 30% 60%, rgba(124, 111, 224, 0.07), transparent),
    radial-gradient(ellipse 50% 40% at 70% 30%, rgba(155, 140, 232, 0.05), transparent);
}

:root[data-theme="light"] .hero-title {
  background: linear-gradient(135deg, #2d2d5e 0%, #5b5fc7 60%, #7c6fe0 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

:root[data-theme="light"] .hero-description {
  color: #5a5a78;
}

:root[data-theme="light"] .hero-particle {
  background: var(--accent-2);
  opacity: 0;
}

/* ---------- Filter Section ---------- */
:root[data-theme="light"] .filter-section {
  background: rgba(245, 243, 240, 0.92);
  border-bottom-color: rgba(0, 0, 0, 0.06);
}

:root[data-theme="light"] .filter-btn {
  color: var(--text-secondary);
  background: rgba(255, 255, 255, 0.7);
  border-color: rgba(0, 0, 0, 0.08);
}

:root[data-theme="light"] .filter-btn:hover {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.9);
  border-color: rgba(0, 0, 0, 0.12);
}

:root[data-theme="light"] .filter-btn.active {
  color: #fff;
  background: var(--accent-gradient);
  border-color: transparent;
  box-shadow: 0 2px 12px var(--accent-glow);
}

/* ---------- Gallery Card ---------- */
:root[data-theme="light"] .gallery-card {
  background: var(--bg-card);
  border-color: rgba(0, 0, 0, 0.06);
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.04);
}

:root[data-theme="light"] .gallery-card:hover {
  border-color: rgba(91, 95, 199, 0.2);
  box-shadow:
    0 12px 40px rgba(0, 0, 0, 0.08),
    0 0 24px var(--accent-glow);
}

:root[data-theme="light"] .card-image-wrap {
  background: #eeecea;
}

:root[data-theme="light"] .card-overlay {
  background: linear-gradient(to top,
      rgba(255, 255, 255, 0.97) 0%,
      rgba(255, 255, 255, 0.5) 50%,
      transparent 100%);
}

:root[data-theme="light"] .card-overlay-text {
  color: var(--text-secondary);
}

:root[data-theme="light"] .card-title {
  color: var(--text-primary);
}

:root[data-theme="light"] .card-category {
  color: var(--accent-2);
  background: rgba(91, 95, 199, 0.08);
}

:root[data-theme="light"] .card-model {
  color: var(--text-muted);
}

:root[data-theme="light"] .card-description {
  color: var(--text-secondary);
}

/* ---------- Lightbox ---------- */
:root[data-theme="light"] .lightbox {
  background: rgba(245, 243, 240, 0.94);
  backdrop-filter: blur(24px);
}

:root[data-theme="light"] .lightbox-close {
  color: var(--text-secondary);
}

:root[data-theme="light"] .lightbox-close:hover {
  color: var(--text-primary);
  background: rgba(0, 0, 0, 0.06);
}

:root[data-theme="light"] .lightbox-img {
  box-shadow: 0 20px 80px rgba(0, 0, 0, 0.15);
}

:root[data-theme="light"] .lightbox-title {
  color: var(--text-primary);
}

:root[data-theme="light"] .lightbox-desc {
  color: var(--text-secondary);
}

:root[data-theme="light"] .lightbox-category {
  color: var(--accent-2);
  background: rgba(91, 95, 199, 0.08);
}

:root[data-theme="light"] .lightbox-model {
  color: var(--accent-1);
  background: rgba(91, 95, 199, 0.08);
}

:root[data-theme="light"] .prompt-toggle {
  color: var(--accent-2);
  background: rgba(91, 95, 199, 0.05);
  border-color: rgba(91, 95, 199, 0.25);
}

:root[data-theme="light"] .prompt-toggle:hover {
  background: rgba(91, 95, 199, 0.12);
  border-color: rgba(91, 95, 199, 0.4);
}

/* ---------- Prompt Modal ---------- */
:root[data-theme="light"] .prompt-modal-backdrop {
  background: rgba(245, 243, 240, 0.9);
}

:root[data-theme="light"] .prompt-modal-body {
  background: #ffffff;
  border-color: rgba(0, 0, 0, 0.08);
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.12);
}

:root[data-theme="light"] .prompt-modal-close {
  color: var(--text-secondary);
}

:root[data-theme="light"] .prompt-modal-close:hover {
  color: var(--text-primary);
  background: rgba(0, 0, 0, 0.05);
}

:root[data-theme="light"] .prompt-title {
  color: var(--text-primary);
}

:root[data-theme="light"] .prompt-modal-content {
  color: var(--text-secondary);
}

:root[data-theme="light"] .prompt-modal-content::-webkit-scrollbar-track {
  background: rgba(0, 0, 0, 0.03);
}

:root[data-theme="light"] .prompt-modal-content::-webkit-scrollbar-thumb {
  background: rgba(0, 0, 0, 0.12);
}

:root[data-theme="light"] .prompt-modal-content::-webkit-scrollbar-thumb:hover {
  background: rgba(0, 0, 0, 0.2);
}

/* ---------- Credit Section ---------- */
:root[data-theme="light"] .credit-card {
  background: rgba(255, 255, 255, 0.8);
  border-color: rgba(0, 0, 0, 0.06);
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.04);
}

:root[data-theme="light"] .credit-card:hover {
  border-color: rgba(91, 95, 199, 0.15);
  box-shadow: 0 8px 32px rgba(91, 95, 199, 0.06);
}

:root[data-theme="light"] .credit-title {
  color: var(--text-primary);
}

:root[data-theme="light"] .credit-update-date {
  color: var(--text-muted);
}

:root[data-theme="light"] .credit-bar-bg {
  background: rgba(0, 0, 0, 0.05);
  border-color: rgba(0, 0, 0, 0.04);
}

:root[data-theme="light"] .credit-bar-labels {
  color: var(--text-muted);
}

:root[data-theme="light"] .credit-detail-label {
  color: var(--text-muted);
}

:root[data-theme="light"] .credit-detail-value {
  color: var(--text-primary);
}

:root[data-theme="light"] .credit-notes {
  border-top-color: rgba(0, 0, 0, 0.06);
}

:root[data-theme="light"] .credit-note {
  color: var(--text-secondary);
}

:root[data-theme="light"] .credit-pending-text {
  color: var(--text-secondary);
}

:root[data-theme="light"] .credit-pending-sub {
  color: var(--text-muted);
}

:root[data-theme="light"] .credit-error-text {
  color: var(--text-muted);
}

/* ---------- About Modal ---------- */
:root[data-theme="light"] .about-modal-backdrop {
  background: rgba(245, 243, 240, 0.9);
}

:root[data-theme="light"] .about-modal-body {
  background: #ffffff;
  border-color: rgba(0, 0, 0, 0.08);
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.12);
}

:root[data-theme="light"] .about-modal-close {
  color: var(--text-secondary);
}

:root[data-theme="light"] .about-modal-close:hover {
  color: var(--text-primary);
  background: rgba(0, 0, 0, 0.05);
}

:root[data-theme="light"] .about-title {
  color: var(--text-primary);
}

:root[data-theme="light"] .about-list li {
  color: var(--text-secondary);
}

:root[data-theme="light"] .about-list li::before {
  color: var(--accent-2);
}

/* ---------- Footer ---------- */
:root[data-theme="light"] .site-footer {
  border-top-color: rgba(0, 0, 0, 0.06);
}

:root[data-theme="light"] .footer-text {
  color: var(--text-muted);
}

:root[data-theme="light"] .footer-about-link {
  color: var(--text-muted);
}

:root[data-theme="light"] .footer-about-link:hover {
  color: var(--accent-2);
}

/* ---------- Gallery Empty State ---------- */
:root[data-theme="light"] .empty-text {
  color: var(--text-secondary);
}

:root[data-theme="light"] .empty-sub {
  color: var(--text-muted);
}

/* ---------- Training Section ---------- */
:root[data-theme="light"] .training-inner {
  background: rgba(255, 255, 255, 0.7);
  border-color: rgba(0, 0, 0, 0.06);
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.03);
}

:root[data-theme="light"] .training-section-title {
  color: var(--text-primary);
}

:root[data-theme="light"] .training-section-desc {
  color: var(--text-muted);
}

:root[data-theme="light"] .training-card {
  background: rgba(255, 255, 255, 0.85);
  border-color: rgba(0, 0, 0, 0.06);
  box-shadow: 0 1px 6px rgba(0, 0, 0, 0.04);
}

:root[data-theme="light"] .training-card:hover {
  border-color: rgba(91, 95, 199, 0.2);
  box-shadow:
    0 8px 28px rgba(0, 0, 0, 0.06),
    0 0 16px var(--accent-glow);
}

:root[data-theme="light"] .training-card-icon {
  background: rgba(91, 95, 199, 0.08);
}

:root[data-theme="light"] .training-card-title {
  color: var(--text-primary);
}

:root[data-theme="light"] .training-card-desc {
  color: var(--text-secondary);
}

:root[data-theme="light"] .training-card-arrow {
  color: var(--accent-2);
}

:root[data-theme="light"] .training-card-badge {
  color: #b45309;
  background: rgba(245, 158, 11, 0.1);
  border-color: rgba(245, 158, 11, 0.2);
}

/* ---------- 上級編カード (Light) ---------- */
:root[data-theme="light"] .training-card-advanced {
  background: linear-gradient(135deg, rgba(91, 95, 199, 0.05), rgba(219, 39, 119, 0.03));
  border-color: rgba(91, 95, 199, 0.2);
}

:root[data-theme="light"] .training-card-advanced:hover {
  border-color: rgba(91, 95, 199, 0.35);
  box-shadow:
    0 8px 28px rgba(0, 0, 0, 0.07),
    0 0 24px rgba(91, 95, 199, 0.12);
}

:root[data-theme="light"] .training-card-advanced .training-card-badge {
  color: #5b5fc7;
  background: rgba(91, 95, 199, 0.1);
  border-color: rgba(91, 95, 199, 0.25);
}

:root[data-theme="light"] .training-card-advanced .training-card-icon {
  background: linear-gradient(135deg, rgba(91, 95, 199, 0.1), rgba(124, 111, 224, 0.1));
}

:root[data-theme="light"] .gallery-section-title {
  color: var(--text-primary);
}

/* ============================================
   Theme Toggle Button
   ============================================ */
.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 1px solid var(--border-glass);
  background: var(--bg-glass);
  cursor: pointer;
  transition: var(--transition-fast);
  font-size: 1.15rem;
  padding: 0;
  line-height: 1;
  flex-shrink: 0;
}

.theme-toggle:hover {
  background: var(--bg-card-hover);
  border-color: rgba(99, 102, 241, 0.3);
  transform: scale(1.08);
}

.theme-toggle:active {
  transform: scale(0.95);
}

/* Theme icon visibility */
.theme-toggle .icon-sun {
  display: none;
}

.theme-toggle .icon-moon {
  display: inline;
}

:root[data-theme="light"] .theme-toggle .icon-sun {
  display: inline;
}

:root[data-theme="light"] .theme-toggle .icon-moon {
  display: none;
}

/* ---------- 追記部分（スマホスワイプヒント） ---------- */
@media (max-width: 768px) {
  :root[data-theme="light"] .header-nav::after {
    background: linear-gradient(to right, transparent, rgba(255, 255, 255, 0.7) 30%, rgba(255, 255, 255, 0.95));
  }
}