/* Modern CSS Reset & Variable Definitions */
:root {
  --font-sans: 'Outfit', 'Noto Sans JP', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  
  /* Color Palette (Light Theme for High Readability) */
  --bg-primary: #ffffff;
  --bg-secondary: #f9fafb;
  --bg-card: rgba(255, 255, 255, 0.85);
  --border-color: rgba(0, 0, 0, 0.08);
  --border-hover: rgba(99, 102, 241, 0.4);
  
  --text-primary: #111827;
  --text-secondary: #4b5563;
  --text-muted: #9ca3af;
  
  --accent-primary: #4f46e5; /* Indigo */
  --accent-secondary: #7c3aed; /* Purple */
  --accent-gradient: linear-gradient(135deg, var(--accent-primary) 0%, var(--accent-secondary) 100%);
  
  --glow-shadow: 0 0 20px rgba(99, 102, 241, 0.1);
  --card-shadow: 0 10px 30px -10px rgba(0, 0, 0, 0.08);
  
  --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --bg-footer: rgba(249, 250, 251, 0.8);
}

/* Base Styles */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  position: relative;
}

/* Background Decorative Elements */
body::before {
  content: "";
  position: fixed;
  top: -10%;
  left: -10%;
  width: 50vw;
  height: 50vh;
  background: radial-gradient(circle, rgba(99, 102, 241, 0.06) 0%, transparent 70%);
  z-index: -1;
  pointer-events: none;
}

body::after {
  content: "";
  position: fixed;
  bottom: -10%;
  right: -10%;
  width: 50vw;
  height: 50vh;
  background: radial-gradient(circle, rgba(168, 85, 247, 0.04) 0%, transparent 70%);
  z-index: -1;
  pointer-events: none;
}

/* Layout Container */
.container {
  max-width: 1000px;
  width: 100%;
  margin: 0 auto;
  padding: 4rem 2rem;
  flex: 1;
}

/* Header Design */
.main-header {
  text-align: center;
  margin-bottom: 4rem;
}

.logo-area {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 64px;
  height: 64px;
  border-radius: 16px;
  background: var(--accent-gradient);
  margin-bottom: 1.5rem;
  box-shadow: var(--glow-shadow);
  color: #ffffff;
}

.logo-icon {
  font-size: 2rem;
  font-weight: bold;
}

.main-title {
  font-size: 2.5rem;
  font-weight: 800;
  letter-spacing: -0.025em;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 0.75rem;
}

.main-description {
  color: var(--text-secondary);
  font-size: 1.1rem;
  max-width: 600px;
  margin: 0 auto;
}

/* Section Styling */
.link-section {
  margin-bottom: 3rem;
}

.section-title {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.section-title::after {
  content: "";
  flex: 1;
  height: 1px;
  background-color: var(--border-color);
}

/* Grid Layout for Links */
.links-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.5rem;
}

/* Premium Card Design */
.link-card {
  display: flex;
  flex-direction: column;
  background-color: var(--bg-secondary);
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 1.5rem;
  text-decoration: none;
  color: inherit;
  transition: var(--transition-smooth);
  position: relative;
  overflow: hidden;
  box-shadow: var(--card-shadow);
}

.link-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.03) 0%, transparent 100%);
  pointer-events: none;
}

/* Card Hover Interactions */
.link-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-hover);
  box-shadow: var(--glow-shadow), var(--card-shadow);
}

/* Card Internal Components */
.card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 1rem;
}

.card-icon {
  font-size: 1.5rem;
  background: rgba(99, 102, 241, 0.1);
  color: var(--accent-primary);
  width: 42px;
  height: 42px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition-smooth);
}

.link-card:hover .card-icon {
  background: var(--accent-gradient);
  color: #ffffff;
}

.arrow-icon {
  color: var(--text-muted);
  transition: var(--transition-smooth);
  font-size: 1.2rem;
}

.link-card:hover .arrow-icon {
  color: var(--accent-secondary);
  transform: translate(2px, -2px);
}

.card-title {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--text-primary);
  transition: var(--transition-smooth);
}

.link-card:hover .card-title {
  color: var(--accent-primary);
}

.card-description {
  font-size: 0.9rem;
  color: var(--text-secondary);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  text-overflow: ellipsis;
  flex-grow: 1;
}

/* Premium Footer */
.main-footer {
  text-align: center;
  padding: 3rem 1.5rem;
  border-top: 1px solid var(--border-color);
  background-color: var(--bg-footer);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  margin-top: auto;
}

.footer-text {
  color: var(--text-muted);
  font-size: 0.85rem;
}

/* Accessibility & Utility */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

/* Responsive adjustments */
@media (max-width: 640px) {
  .container {
    padding: 2.5rem 1rem;
  }
  .main-title {
    font-size: 2rem;
  }
  .links-grid {
    grid-template-columns: 1fr;
  }
}

/* Subpage Styles & Back Button */
.back-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.95rem;
  margin-bottom: 2rem;
  transition: var(--transition-smooth);
  padding: 0.5rem 1rem;
  border-radius: 8px;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
}

.back-link:hover {
  color: var(--text-primary);
  border-color: var(--border-hover);
  transform: translateX(-4px);
}

/* Category Grouping in Portal */
.category-group {
  margin-bottom: 3.5rem;
}

.group-header {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 1.5rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  letter-spacing: 0.03em;
}

.group-header-icon {
  color: var(--accent-primary);
  display: flex;
  align-items: center;
}

.group-header::after {
  content: "";
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, rgba(99, 102, 241, 0.4), transparent);
}

/* Dictionary Styles */
.search-wrapper {
  margin: 0 auto 2.5rem auto;
  max-width: 500px;
  width: 100%;
}

.search-box {
  width: 100%;
  padding: 0.85rem 1.25rem;
  font-size: 1rem;
  font-family: var(--font-sans);
  background-color: var(--bg-secondary);
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  color: var(--text-primary);
  outline: none;
  transition: var(--transition-smooth);
}

.search-box:focus {
  border-color: var(--accent-primary);
  box-shadow: var(--glow-shadow);
}

.alphabet-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 2.5rem;
  justify-content: center;
  padding: 0.75rem;
  background-color: var(--bg-secondary);
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  backdrop-filter: blur(8px);
}

.alphabet-nav-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
  color: var(--text-secondary);
  border-radius: 8px;
  transition: var(--transition-smooth);
}

.alphabet-nav-link:hover, .alphabet-nav-link.active {
  background: var(--accent-gradient);
  color: #ffffff;
}

.word-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.25rem;
  margin-bottom: 3rem;
}

.word-item {
  display: flex;
  flex-direction: column;
  background-color: var(--bg-secondary);
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 14px;
  padding: 1.25rem;
  transition: var(--transition-smooth);
  box-shadow: var(--card-shadow);
}

.word-item:hover {
  transform: translateY(-2px);
  border-color: var(--border-hover);
}

.word-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.75rem;
}

.word-spelling-wrapper {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.word-spelling {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.01em;
}

.btn-pronounce {
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 4px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  transition: var(--transition-smooth);
}

.btn-pronounce:hover {
  color: var(--accent-primary);
  background-color: rgba(255, 255, 255, 0.05);
  transform: scale(1.1);
}

.btn-pronounce svg {
  display: block;
}

.word-ipa {
  display: block;
  font-family: var(--font-sans);
  font-size: 0.85rem;
  color: var(--accent-light);
  margin-top: -0.25rem;
  margin-bottom: 0.75rem;
  font-style: italic;
  opacity: 0;
  transition: opacity 0.3s ease;
  height: 0;
  overflow: hidden;
}

.word-ipa.visible {
  opacity: 1;
  height: auto;
  margin-top: -0.25rem;
  margin-bottom: 0.75rem;
}

.pos-badge {
  display: inline-block;
  padding: 0.2rem 0.6rem;
  font-size: 0.75rem;
  font-weight: 700;
  border-radius: 6px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* Part of Speech Badge Colors */
.pos-vt, .pos-vi, .pos-v {
  background-color: rgba(99, 102, 241, 0.08);
  color: #4f46e5;
  border: 1px solid rgba(99, 102, 241, 0.2);
}

.pos-n {
  background-color: rgba(16, 185, 129, 0.08);
  color: #059669;
  border: 1px solid rgba(16, 185, 129, 0.2);
}

.pos-a, .pos-adj {
  background-color: rgba(168, 85, 247, 0.08);
  color: #7c3aed;
  border: 1px solid rgba(168, 85, 247, 0.2);
}

.pos-ad, .pos-adv {
  background-color: rgba(245, 158, 11, 0.08);
  color: #d97706;
  border: 1px solid rgba(245, 158, 11, 0.2);
}

.pos-prep {
  background-color: rgba(239, 68, 68, 0.08);
  color: #dc2626;
  border: 1px solid rgba(239, 68, 68, 0.2);
}

.pos-conj {
  background-color: rgba(20, 184, 166, 0.08);
  color: #0d9488;
  border: 1px solid rgba(20, 184, 166, 0.2);
}

.pos-pron {
  background-color: rgba(6, 182, 212, 0.08);
  color: #0891b2;
  border: 1px solid rgba(6, 182, 212, 0.2);
}

.pos-default {
  background-color: rgba(107, 114, 128, 0.08);
  color: #4b5563;
  border: 1px solid rgba(107, 114, 128, 0.2);
}

.word-meaning {
  font-size: 0.95rem;
  color: var(--text-primary);
  line-height: 1.5;
}

.no-results {
  grid-column: 1 / -1;
  text-align: center;
  padding: 3rem;
  color: var(--text-secondary);
  background: var(--bg-card);
  border: 1px dashed var(--border-color);
  border-radius: 12px;
  font-size: 1.1rem;
}

/* Footer Navigation Menu */
.footer-nav {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 1.25rem;
  margin-top: 1rem;
  font-size: 0.85rem;
}

.footer-nav a {
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: 500;
  transition: var(--transition-smooth);
}

.footer-nav a:hover {
  color: var(--accent-primary);
}

/* Contact Form Styling */
.contact-form {
  max-width: 600px;
  margin: 2rem auto;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  padding: 2.5rem;
  border-radius: 16px;
  box-shadow: var(--card-shadow);
}

.form-group {
  margin-bottom: 1.5rem;
  text-align: left;
}

.form-group label {
  display: block;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--text-primary);
  font-size: 0.95rem;
}

.form-group label .required {
  color: #dc2626;
  font-size: 0.8rem;
  margin-left: 0.25rem;
}

.form-group input[type="text"],
.form-group input[type="email"],
.form-group textarea {
  width: 100%;
  padding: 0.75rem 1rem;
  border-radius: 8px;
  border: 1px solid var(--border-color);
  background-color: var(--bg-secondary);
  color: var(--text-primary);
  font-family: inherit;
  font-size: 0.95rem;
  transition: var(--transition-smooth);
  box-sizing: border-box;
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--accent-primary);
  background-color: var(--bg-card);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.btn-submit {
  width: 100%;
  padding: 0.85rem;
  background: var(--accent-gradient);
  color: #ffffff;
  border: none;
  border-radius: 8px;
  font-weight: 700;
  font-size: 1rem;
  cursor: pointer;
  transition: var(--transition-smooth);
}

.btn-submit:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(99, 102, 241, 0.25);
}

.form-note {
  max-width: 600px;
  margin: 1.5rem auto 0;
  padding: 1rem;
  background-color: rgba(99, 102, 241, 0.05);
  border-left: 4px solid var(--accent-primary);
  border-radius: 4px;
  font-size: 0.85rem;
  color: var(--text-secondary);
  text-align: left;
}

.form-note p {
  margin: 0.25rem 0;
}

/* News/Announcements Timeline */
.news-list {
  max-width: 800px;
  margin: 2rem auto;
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
}

.news-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 2rem;
  text-align: left;
  box-shadow: var(--card-shadow);
  transition: var(--transition-smooth);
}

.news-item:hover {
  border-color: var(--border-hover);
  transform: translateY(-2px);
}

.news-header {
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 1rem;
  margin-bottom: 1.25rem;
}

.news-date {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-weight: 600;
  display: block;
  margin-bottom: 0.5rem;
}

.news-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 0;
}

.news-body p {
  line-height: 1.7;
  color: var(--text-secondary);
  margin-bottom: 1rem;
}

.news-body p:last-child {
  margin-bottom: 0;
}

/* About and Policy Styling */
.about-content,
.privacy-policy-content {
  max-width: 800px;
  margin: 2rem auto;
  text-align: left;
}

.about-section,
.policy-section {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 2rem;
  margin-bottom: 2rem;
  box-shadow: var(--card-shadow);
}

.about-section h3,
.policy-section h3 {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-top: 0;
  margin-bottom: 1.25rem;
  border-left: 4px solid var(--accent-primary);
  padding-left: 0.75rem;
}

.about-section p,
.policy-section p {
  line-height: 1.7;
  color: var(--text-secondary);
  margin-bottom: 1rem;
}

.about-section p:last-child,
.policy-section p:last-child {
  margin-bottom: 0;
}

.about-section ul,
.policy-section ul {
  padding-left: 1.5rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

.about-section li,
.policy-section li {
  margin-bottom: 0.5rem;
}

.faq-list dt {
  font-weight: 700;
  color: var(--text-primary);
  margin-top: 1.5rem;
  margin-bottom: 0.5rem;
}

.faq-list dd {
  margin-left: 0;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 1.5rem;
}

/* Phrasal Verbs Layout */
.phrasal-verbs-wrapper {
  margin-top: 2rem;
  text-align: left;
}

.phrasal-group-section {
  margin-bottom: 3.5rem;
}

.phrasal-group-title {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 1.5rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--border-color);
  display: flex;
  align-items: center;
}

.phrasal-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.25rem;
}

.phrasal-item {
  display: flex;
  flex-direction: column;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 14px;
  padding: 1.25rem;
  transition: var(--transition-smooth);
  box-shadow: var(--card-shadow);
  backdrop-filter: blur(8px);
}

.phrasal-item:hover {
  transform: translateY(-2px);
  border-color: var(--border-hover);
  box-shadow: 0 12px 20px -8px rgba(99, 102, 241, 0.15);
}

.phrasal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.75rem;
}

.phrasal-spelling {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--accent-primary);
  text-decoration: none;
  transition: var(--transition-smooth);
}

.phrasal-spelling:hover {
  color: var(--accent-secondary);
}

.phrasal-arrow {
  color: var(--text-muted);
  font-size: 0.85rem;
  transition: var(--transition-smooth);
}

.phrasal-item:hover .phrasal-arrow {
  color: var(--accent-secondary);
  transform: translate(2px, -2px);
}

.phrasal-meaning {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* Favorite (Star) Button Styles */
.btn-favorite {
  background: transparent;
  border: none;
  color: var(--text-muted);
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--transition-smooth);
  padding: 0;
}

.btn-favorite:hover {
  background: rgba(245, 158, 11, 0.1);
  color: #f59e0b; /* Amber */
  transform: scale(1.15) rotate(15deg);
}

.btn-favorite.active {
  color: #f59e0b; /* Amber */
  fill: #f59e0b;
  transform: scale(1.05);
}

/* My Vocab Page Styles */
.my-tango-actions {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 2rem;
  flex-wrap: wrap;
  gap: 1rem;
}

.btn-danger {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.6rem 1.2rem;
  background: rgba(239, 68, 68, 0.08);
  border: 1px solid rgba(239, 68, 68, 0.2);
  color: #ef4444;
  border-radius: 8px;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition-smooth);
}

.btn-danger:hover {
  background: #ef4444;
  color: #ffffff;
  border-color: transparent;
}

.empty-state {
  text-align: center;
  padding: 4rem 2rem;
  background: var(--bg-card);
  border: 1px dashed var(--border-color);
  border-radius: 16px;
  color: var(--text-secondary);
}

.empty-icon {
  font-size: 3rem;
  margin-bottom: 1rem;
  color: var(--text-muted);
  display: block;
}

.empty-text {
  font-size: 1.1rem;
  margin-bottom: 1.5rem;
}

.btn-back-to-tango {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.6rem 1.2rem;
  background: var(--accent-gradient);
  color: #ffffff;
  border: none;
  border-radius: 8px;
  font-size: 0.9rem;
  font-weight: 600;
  text-decoration: none;
  transition: var(--transition-smooth);
}

.btn-back-to-tango:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(124, 58, 237, 0.2);
}

/* ==========================================================================
   Learning Tools: Flashcards & Quiz Styles
   ========================================================================== */

/* Layout & Controls */
.setup-container {
  max-width: 500px;
  margin: 0 auto;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 2rem;
  box-shadow: var(--card-shadow);
  backdrop-filter: blur(8px);
}

.setup-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
  text-align: center;
  color: var(--text-primary);
}

.form-group {
  margin-bottom: 1.5rem;
}

.form-label {
  display: block;
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--text-secondary);
}

.form-select, .form-input {
  width: 100%;
  padding: 0.75rem 1rem;
  border-radius: 8px;
  border: 1px solid var(--border-color);
  background: var(--bg-primary);
  color: var(--text-primary);
  font-size: 0.95rem;
  font-family: inherit;
  outline: none;
  transition: var(--transition-smooth);
}

.form-select:focus, .form-input:focus {
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.btn-start {
  width: 100%;
  padding: 0.85rem;
  background: var(--accent-gradient);
  color: #ffffff;
  border: none;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  transition: var(--transition-smooth);
}

.btn-start:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(99, 102, 241, 0.25);
}

/* Flashcard 3D Engine */
.flashcard-game-container {
  max-width: 600px;
  margin: 0 auto;
}

.card-progress-wrapper {
  margin-bottom: 2rem;
}

.card-progress-bar {
  width: 100%;
  height: 6px;
  background: rgba(0, 0, 0, 0.05);
  border-radius: 3px;
  margin-bottom: 0.5rem;
  overflow: hidden;
}

.card-progress-fill {
  height: 100%;
  background: var(--accent-gradient);
  width: 0%;
  transition: width 0.3s ease;
}

.card-progress-text {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
  text-align: right;
}

.flip-card-wrapper {
  perspective: 1200px;
  margin-bottom: 2.5rem;
}

.flip-card {
  width: 100%;
  height: 320px;
  position: relative;
  transform-style: preserve-3d;
  transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
  cursor: pointer;
}

.flip-card.flipped {
  transform: rotateY(180deg);
}

.flip-card-inner {
  position: absolute;
  width: 100%;
  height: 100%;
  transform-style: preserve-3d;
}

.flip-card-front, .flip-card-back {
  position: absolute;
  width: 100%;
  height: 100%;
  backface-visibility: hidden;
  border-radius: 24px;
  padding: 2rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  box-shadow: var(--card-shadow);
  backdrop-filter: blur(8px);
}

.flip-card-back {
  transform: rotateY(180deg);
}

.card-hint {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
  position: absolute;
  bottom: 1.5rem;
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

/* Flashcard Action Buttons */
.card-actions {
  display: flex;
  justify-content: center;
  gap: 1.5rem;
}

.btn-card-action {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.85rem 1.75rem;
  border-radius: 12px;
  font-weight: 700;
  font-size: 0.95rem;
  cursor: pointer;
  transition: var(--transition-smooth);
  border: 1px solid var(--border-color);
  background: var(--bg-card);
  color: var(--text-primary);
  min-width: 140px;
}

.btn-card-action:hover {
  transform: translateY(-2px);
  box-shadow: var(--card-shadow);
}

.btn-card-action.know {
  border-color: rgba(16, 185, 129, 0.3);
  background: rgba(16, 185, 129, 0.03);
}

.btn-card-action.know:hover {
  background: rgba(16, 185, 129, 0.08);
  border-color: #10b981;
  color: #047857;
}

.btn-card-action.again {
  border-color: rgba(239, 68, 68, 0.3);
  background: rgba(239, 68, 68, 0.03);
}

.btn-card-action.again:hover {
  background: rgba(239, 68, 68, 0.08);
  border-color: #ef4444;
  color: #b91c1c;
}

/* Word Quiz Component */
.quiz-game-container {
  max-width: 600px;
  margin: 0 auto;
}

.quiz-question-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  padding: 2.5rem;
  box-shadow: var(--card-shadow);
  backdrop-filter: blur(8px);
  margin-bottom: 2rem;
  text-align: center;
}

.quiz-question-word {
  font-size: 2.5rem;
  font-family: 'Outfit', sans-serif;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 1rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
}

.quiz-options-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  margin-bottom: 2rem;
}

.quiz-option {
  width: 100%;
  padding: 1.25rem;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  font-size: 1.05rem;
  font-weight: 500;
  color: var(--text-primary);
  text-align: left;
  cursor: pointer;
  transition: var(--transition-smooth);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.quiz-option:hover {
  border-color: var(--border-hover);
  background: rgba(99, 102, 241, 0.02);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.02);
}

.quiz-option.correct {
  background: rgba(16, 185, 129, 0.08) !important;
  border-color: #10b981 !important;
  color: #065f46 !important;
  font-weight: 600;
}

.quiz-option.incorrect {
  background: rgba(239, 68, 68, 0.08) !important;
  border-color: #ef4444 !important;
  color: #991b1b !important;
}

.quiz-option-letter {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: 8px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-secondary);
  margin-right: 0.75rem;
}

.quiz-option:hover .quiz-option-letter {
  background: var(--accent-gradient);
  color: #ffffff;
  border-color: transparent;
}

.quiz-option-status-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

/* Quiz Result Dashboard */
.result-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  padding: 3rem 2rem;
  box-shadow: var(--card-shadow);
  backdrop-filter: blur(8px);
  text-align: center;
}

.score-circle {
  position: relative;
  width: 150px;
  height: 150px;
  margin: 0 auto 2rem;
  border-radius: 50%;
  background: var(--bg-secondary);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  border: 4px solid var(--border-color);
}

.score-value {
  font-size: 3rem;
  font-weight: 800;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  line-height: 1;
}

.score-label {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-secondary);
  margin-top: 0.25rem;
}

.result-message {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 1.5rem;
}

.review-section {
  text-align: left;
  margin-top: 2.5rem;
  border-top: 1px solid var(--border-color);
  padding-top: 2rem;
}

.review-title {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 1rem;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.review-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.review-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.25rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  transition: var(--transition-smooth);
}

.review-item:hover {
  transform: translateX(3px);
  border-color: var(--border-hover);
}

.review-word-info {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.review-spelling {
  font-weight: 700;
  color: var(--text-primary);
}

.review-meaning {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.result-actions {
  display: flex;
  justify-content: center;
  gap: 1rem;
  margin-top: 2rem;
}

.btn-result-action {
  padding: 0.8rem 1.5rem;
  border-radius: 8px;
  font-weight: 700;
  font-size: 0.95rem;
  cursor: pointer;
  text-decoration: none;
  transition: var(--transition-smooth);
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.btn-result-action.primary {
  background: var(--accent-gradient);
  color: #ffffff;
  border: none;
}

.btn-result-action.primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(99, 102, 241, 0.25);
}

.btn-result-action.secondary {
  background: var(--bg-card);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}

.btn-result-action.secondary:hover {
  background: var(--bg-secondary);
  transform: translateY(-1px);
}

/* ==========================================================================
   Smart Search Bar Styles
   ========================================================================== */
.smart-search-wrapper {
  position: relative;
  z-index: 1000;
  max-width: 600px;
  margin: 0 auto;
}

.search-input-container {
  position: relative;
  width: 100%;
}

.search-icon-inside {
  position: absolute;
  left: 1.25rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  pointer-events: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.search-clear-btn {
  position: absolute;
  right: 1.25rem;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text-muted);
  transition: var(--transition-smooth);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  border-radius: 50%;
}

.search-clear-btn:hover {
  background: rgba(0, 0, 0, 0.05);
  color: var(--text-primary);
}

/* Search results popover panel */
.search-results-panel {
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  margin-top: 0.5rem;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  box-shadow: 0 20px 40px -15px rgba(0, 0, 0, 0.15);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  padding: 1.25rem;
  max-height: 450px;
  overflow-y: auto;
  z-index: 1001;
  display: none;
  animation: searchPanelFadeIn 0.2s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

@keyframes searchPanelFadeIn {
  from {
    opacity: 0;
    transform: translateY(-5px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Custom scrollbar for search results */
.search-results-panel::-webkit-scrollbar {
  width: 6px;
}
.search-results-panel::-webkit-scrollbar-track {
  background: transparent;
}
.search-results-panel::-webkit-scrollbar-thumb {
  background: rgba(0, 0, 0, 0.1);
  border-radius: 3px;
}
.search-results-panel::-webkit-scrollbar-thumb:hover {
  background: rgba(0, 0, 0, 0.2);
}

/* Subdivision Headers in search results */
.search-section-header {
  font-size: 0.75rem;
  font-weight: 800;
  text-transform: uppercase;
  color: var(--text-muted);
  letter-spacing: 0.05em;
  margin-bottom: 0.75rem;
  margin-top: 1rem;
  padding-bottom: 0.25rem;
  border-bottom: 1px solid rgba(0, 0, 0, 0.04);
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.search-section-header:first-of-type {
  margin-top: 0;
}

.search-section-content {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

/* Search results item card style */
.search-result-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1rem;
  border-radius: 10px;
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  text-decoration: none;
  color: var(--text-primary);
  transition: var(--transition-smooth);
}

.search-result-item:hover {
  transform: translateX(3px);
  border-color: var(--border-hover);
  background: rgba(99, 102, 241, 0.01);
}

.search-result-info {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  flex: 1;
}

.search-result-title {
  font-weight: 700;
  font-size: 0.95rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.search-result-desc {
  font-size: 0.8rem;
  color: var(--text-secondary);
  line-height: 1.4;
  word-break: break-all;
}

.search-result-badge {
  font-size: 0.7rem;
  font-weight: 700;
  padding: 0.15rem 0.4rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  color: var(--text-secondary);
}

/* Word Mini Card inside search results */
.search-word-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1rem;
  border-radius: 10px;
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  transition: var(--transition-smooth);
}

.search-word-card:hover {
  transform: translateX(3px);
  border-color: var(--border-hover);
}

.search-word-main {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.search-word-spelling {
  font-weight: 800;
  font-size: 1.05rem;
  color: var(--text-primary);
}

.search-word-meaning {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-left: 0.5rem;
}

.search-word-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.btn-search-word-action {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text-muted);
  transition: var(--transition-smooth);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  border: 1px solid var(--border-color);
}

.btn-search-word-action:hover {
  color: var(--accent-primary);
  border-color: var(--accent-primary);
  transform: scale(1.05);
}

.btn-search-word-action.fav:hover {
  color: #f59e0b;
  border-color: #f59e0b;
}

.btn-search-word-action.fav.active {
  color: #f59e0b;
  border-color: #f59e0b;
  background: rgba(245, 158, 11, 0.05);
  fill: #f59e0b;
}

.search-no-results {
  text-align: center;
  padding: 2rem 1rem;
  color: var(--text-muted);
  font-size: 0.95rem;
  font-weight: 500;
}

/* 目的別タグフィルター */
.tag-filter-container {
  padding: 0 1rem;
}

.tag-chips {
  padding: 0.25rem;
}

.tag-chip {
  background: var(--bg-card);
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
  padding: 0.5rem 1.25rem;
  font-size: 0.9rem;
  font-weight: 500;
  border-radius: 50px;
  cursor: pointer;
  backdrop-filter: blur(8px);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  outline: none;
  display: flex;
  align-items: center;
  gap: 0.25rem;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.02);
}

.tag-chip:hover {
  background: var(--bg-secondary);
  color: var(--text-primary);
  border-color: var(--accent-primary);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}

.tag-chip.active {
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  color: #ffffff;
  border-color: transparent;
  box-shadow: 0 4px 15px rgba(99, 102, 241, 0.3);
}

/* オススメサイトのお気に入り星マーク */
.link-fav-star {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  border: 1px solid var(--border-color);
  background: var(--bg-card);
  color: var(--text-muted);
  cursor: pointer;
  transition: all 0.3s ease;
  z-index: 10;
}

.link-fav-star:hover {
  color: #f59e0b;
  border-color: #f59e0b;
  transform: scale(1.1);
}

.link-fav-star.active {
  color: #f59e0b;
  border-color: #f59e0b;
  background: rgba(245, 158, 11, 0.05);
  fill: #f59e0b;
}

/* 今日の学習ウィジェット */
.todays-widget-container {
  padding: 0 1rem;
}

.todays-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 1.25rem 1.5rem;
  box-shadow: var(--card-shadow);
  backdrop-filter: blur(8px);
  position: relative;
  overflow: hidden;
  transition: var(--transition-smooth);
}

.todays-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.06);
  border-color: var(--accent-primary);
}

.todays-card-badge {
  position: absolute;
  top: 0;
  left: 0;
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  color: #ffffff;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.35rem 1rem;
  border-bottom-right-radius: 12px;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.05);
}

.todays-card-body {
  margin-top: 1rem;
}

.todays-word-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.5rem;
}

.todays-word-spelling {
  font-family: 'Outfit', sans-serif;
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text-primary);
}

.todays-word-meaning {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin: 0;
}

.todays-word-actions {
  display: flex;
  gap: 0.5rem;
  align-items: center;
}

.btn-todays-action {
  background: none;
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  cursor: pointer;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s ease;
  text-decoration: none;
}

.btn-todays-action:hover {
  color: var(--accent-primary);
  border-color: var(--accent-primary);
  background: rgba(99, 102, 241, 0.05);
}

.btn-todays-action.fav.active {
  color: #f59e0b;
  border-color: #f59e0b;
  background: rgba(245, 158, 11, 0.05);
  fill: #f59e0b;
}

/* 今日の学習ウィジェット グリッドレイアウト */
.todays-card-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  margin-top: 1rem;
}

@media (max-width: 768px) {
  .todays-card-grid {
    grid-template-columns: 1fr;
    gap: 1rem;
  }
}

/* ==========================================================================
   Dark Theme Overrides
   ========================================================================== */
body.dark-theme {
  --bg-primary: #0a0f1d;
  --bg-secondary: #121826;
  --bg-card: rgba(20, 26, 42, 0.85);
  --border-color: rgba(255, 255, 255, 0.08);
  --border-hover: rgba(124, 58, 237, 0.6);
  
  --text-primary: #f9fafb;
  --text-secondary: #d1d5db;
  --text-muted: #6b7280;
  
  --accent-primary: #6366f1; /* Lighter Indigo */
  --accent-secondary: #8b5cf6; /* Lighter Purple */
  
  --glow-shadow: 0 0 25px rgba(99, 102, 241, 0.25);
  --card-shadow: 0 10px 30px -10px rgba(0, 0, 0, 0.45);
  --bg-footer: rgba(18, 24, 38, 0.85);
}

body.dark-theme::before {
  background: radial-gradient(circle, rgba(99, 102, 241, 0.15) 0%, transparent 70%);
}

body.dark-theme::after {
  background: radial-gradient(circle, rgba(168, 85, 247, 0.1) 0%, transparent 70%);
}

/* Theme Toggle Button Style */
.theme-toggle-btn {
  position: fixed;
  top: 1.5rem;
  right: 1.5rem;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--card-shadow);
  backdrop-filter: blur(8px);
  z-index: 1000;
  transition: var(--transition-smooth);
}

.theme-toggle-btn:hover {
  transform: scale(1.1) rotate(15deg);
  border-color: var(--accent-primary);
  color: var(--accent-primary);
}

.theme-toggle-btn svg {
  width: 20px;
  height: 20px;
}

@media (max-width: 768px) {
  .theme-toggle-btn {
    top: 1rem;
    right: 1rem;
    width: 38px;
    height: 38px;
  }
}

/* Sun/Moon Toggle Icon Visibility */
body.dark-theme .theme-toggle-btn .sun-icon {
  display: block !important;
}
body.dark-theme .theme-toggle-btn .moon-icon {
  display: none !important;
}
body:not(.dark-theme) .theme-toggle-btn .sun-icon {
  display: none !important;
}
body:not(.dark-theme) .theme-toggle-btn .moon-icon {
  display: block !important;
}

/* ==========================================================================
   AI Prompts Page Styles
   ========================================================================== */
.prompts-container {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  margin-top: 2rem;
}

.prompt-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 2rem;
  box-shadow: var(--card-shadow);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  transition: var(--transition-smooth);
  text-align: left;
  display: flex;
  flex-direction: column;
}

.prompt-card:hover {
  transform: translateY(-3px);
  border-color: var(--border-hover);
  box-shadow: 0 15px 35px -10px rgba(99, 102, 241, 0.15);
}

.prompt-card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 1rem;
}

.prompt-card-title {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--text-primary);
  margin: 0;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.prompt-ai-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  font-size: 0.75rem;
  font-weight: 700;
  background: rgba(99, 102, 241, 0.08);
  border: 1px solid rgba(99, 102, 241, 0.2);
  color: var(--accent-primary);
  padding: 0.35rem 0.75rem;
  border-radius: 20px;
}

body.dark-theme .prompt-ai-badge {
  background: rgba(99, 102, 241, 0.15);
  border-color: rgba(99, 102, 241, 0.3);
  color: #a5b4fc;
}

.prompt-description {
  font-size: 0.95rem;
  line-height: 1.6;
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
}

.prompt-box-wrapper {
  position: relative;
  width: 100%;
  margin-top: auto;
  border-radius: 10px;
  overflow: hidden;
  border: 1px solid var(--border-color);
  background: var(--bg-secondary);
}

.prompt-box {
  width: 100%;
  max-height: 220px;
  overflow-y: auto;
  padding: 1.25rem;
  padding-right: 4.5rem; /* Space for the absolute copy button */
  font-family: 'Courier New', Courier, monospace;
  font-size: 0.88rem;
  line-height: 1.5;
  color: var(--text-primary);
  white-space: pre-wrap;
  word-break: break-all;
  border: none;
  background: transparent;
  outline: none;
  resize: none;
}

.btn-copy {
  position: absolute;
  top: 0.75rem;
  right: 0.75rem;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.5rem 0.85rem;
  font-size: 0.8rem;
  font-weight: 700;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  border-radius: 6px;
  cursor: pointer;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
  transition: var(--transition-smooth);
  z-index: 10;
}

.btn-copy:hover {
  background: var(--accent-primary);
  color: #ffffff;
  border-color: transparent;
  transform: translateY(-1px);
}

.btn-copy.success {
  background: #10b981 !important; /* Green */
  color: #ffffff !important;
  border-color: transparent !important;
}

/* Update Notice Banner */
.prompt-notice-banner {
  background: rgba(245, 158, 11, 0.05);
  border: 1px solid rgba(245, 158, 11, 0.15);
  border-radius: 12px;
  padding: 1.25rem 1.5rem;
  margin-bottom: 2rem;
  text-align: left;
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
}

.prompt-notice-icon {
  font-size: 1.25rem;
  line-height: 1;
}

.prompt-notice-text {
  font-size: 0.9rem;
  line-height: 1.6;
  color: #b45309; /* Dark Amber */
}

body.dark-theme .prompt-notice-banner {
  background: rgba(245, 158, 11, 0.08);
  border-color: rgba(245, 158, 11, 0.25);
}

body.dark-theme .prompt-notice-text {
  color: #fcd34d; /* Light Amber */
}

/* Skeleton Screen (Shimmer Effect) */
@keyframes shimmer {
  0% {
    background-position: -200% 0;
  }
  100% {
    background-position: 200% 0;
  }
}

.loading-skeleton {
  position: relative;
  overflow: hidden;
}

.loading-skeleton::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.05), transparent);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  pointer-events: none;
}

body:not(.dark-theme) .loading-skeleton::after {
  background: linear-gradient(90deg, transparent, rgba(0, 0, 0, 0.03), transparent);
}

.skeleton-text {
  display: inline-block;
  background: var(--border-color);
  border-radius: 4px;
  color: transparent !important;
  user-select: none;
}

/* HTML Theme alignment for mobile bounce-scroll */
html {
  background-color: #ffffff;
}
html:has(body.dark-theme) {
  background-color: #0a0f1d;
}

/* Scroll to Top Button */
.scroll-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--accent-gradient);
  color: #ffffff;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 20px rgba(99, 102, 241, 0.3);
  z-index: 999;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  transform: translateY(10px);
}

.scroll-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.scroll-to-top:hover {
  transform: translateY(-5px);
  box-shadow: 0 6px 24px rgba(99, 102, 241, 0.4);
}

.scroll-to-top svg {
  width: 20px;
  height: 20px;
  stroke: currentColor;
  stroke-width: 2.5;
  fill: none;
  stroke-linecap: round;
  stroke-linejoin: round;
}

/* Mobile adjustments for Scroll to Top */
@media (max-width: 768px) {
  .scroll-to-top {
    bottom: 1.5rem;
    right: 1.5rem;
    width: 44px;
    height: 44px;
  }
}

/* Featured Banner Card */
.featured-banner-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.5rem 2rem;
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.06) 0%, rgba(168, 85, 247, 0.06) 100%);
  border: 1px solid rgba(99, 102, 241, 0.15);
  border-radius: 20px;
  text-decoration: none;
  transition: var(--transition-smooth);
  box-shadow: var(--card-shadow);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  overflow: hidden;
  position: relative;
}

body.dark-theme .featured-banner-card {
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.12) 0%, rgba(168, 85, 247, 0.12) 100%);
  border-color: rgba(99, 102, 241, 0.3);
}

.featured-banner-card::before {
  content: "";
  position: absolute;
  top: -50%;
  left: -20%;
  width: 150px;
  height: 150px;
  background: rgba(99, 102, 241, 0.12);
  filter: blur(40px);
  border-radius: 50%;
  pointer-events: none;
}

.featured-banner-card::after {
  content: "";
  position: absolute;
  bottom: -50%;
  right: -10%;
  width: 120px;
  height: 120px;
  background: rgba(168, 85, 247, 0.1);
  filter: blur(30px);
  border-radius: 50%;
  pointer-events: none;
}

.featured-banner-card:hover {
  transform: translateY(-3px);
  border-color: var(--accent-primary) !important;
  box-shadow: 0 15px 35px -10px rgba(99, 102, 241, 0.2) !important;
}

.featured-banner-info {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  z-index: 1;
}

.featured-banner-icon {
  font-size: 2rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 54px;
  height: 54px;
  background: linear-gradient(135deg, #6366f1, #8b5cf6);
  color: #ffffff;
  border-radius: 14px;
  box-shadow: 0 8px 16px rgba(99, 102, 241, 0.2);
}

.featured-banner-badge {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  background: rgba(99, 102, 241, 0.08);
  border: 1px solid rgba(99, 102, 241, 0.15);
  color: var(--accent-primary);
  padding: 0.2rem 0.65rem;
  border-radius: 50px;
  margin-bottom: 0.4rem;
}

body.dark-theme .featured-banner-badge {
  background: rgba(99, 102, 241, 0.2);
  border-color: rgba(99, 102, 241, 0.3);
  color: #a5b4fc;
}

.featured-banner-title {
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--text-primary);
  margin: 0;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.featured-banner-subbadge {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-secondary);
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  padding: 0.15rem 0.45rem;
  border-radius: 4px;
  font-family: sans-serif;
}

.featured-banner-desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin: 0.25rem 0 0 0;
  line-height: 1.4;
}

.featured-banner-arrow {
  font-size: 1.5rem;
  color: var(--accent-primary);
  font-weight: bold;
  transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  z-index: 1;
}

.featured-banner-card:hover .featured-banner-arrow {
  transform: translateX(6px);
}

@media (max-width: 576px) {
  .featured-banner-card {
    padding: 1.25rem 1.5rem;
  }
  .featured-banner-info {
    gap: 0.75rem;
  }
  .featured-banner-icon {
    width: 44px;
    height: 44px;
    font-size: 1.5rem;
    border-radius: 10px;
  }
  .featured-banner-title {
    font-size: 1.05rem;
  }
  .featured-banner-arrow {
    display: none;
  }
}