/* Radix - Latin Roots English Learning Platform Stylesheet */
@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@300;400;500;600;700;800&family=Space+Grotesk:wght@500;700&display=swap');

:root {
  --bg-dark: #090d16;
  --bg-card: rgba(18, 26, 44, 0.7);
  --bg-card-hover: rgba(28, 40, 68, 0.8);
  --border-color: rgba(255, 255, 255, 0.08);
  --border-glow: rgba(99, 102, 241, 0.3);
  
  --primary: #6366f1;
  --primary-light: #818cf8;
  --primary-glow: rgba(99, 102, 241, 0.4);
  --accent-cyan: #06b6d4;
  --accent-purple: #a855f7;
  --accent-gold: #f59e0b;
  --accent-green: #10b981;
  --accent-red: #ef4444;
  
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
  
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  
  --font-main: 'Plus Jakarta Sans', sans-serif;
  --font-display: 'Space Grotesk', sans-serif;
  
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
  font-family: var(--font-main);
  background-color: var(--bg-dark);
  background-image: 
    radial-gradient(circle at 15% 15%, rgba(99, 102, 241, 0.15) 0%, transparent 40%),
    radial-gradient(circle at 85% 85%, rgba(168, 85, 247, 0.12) 0%, transparent 40%),
    radial-gradient(circle at 50% 50%, rgba(6, 182, 212, 0.08) 0%, transparent 60%);
  background-attachment: fixed;
  color: var(--text-main);
  min-height: 100vh;
  line-height: 1.6;
  overflow-x: hidden;
}

/* Scrollbar customization */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}
::-webkit-scrollbar-track {
  background: rgba(15, 23, 42, 0.6);
}
::-webkit-scrollbar-thumb {
  background: rgba(99, 102, 241, 0.4);
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--primary);
}

/* Header & Navbar */
.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.25rem 2rem;
  background: rgba(9, 13, 22, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 100;
}

.logo-container {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.logo-icon {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--primary), var(--accent-purple));
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.4rem;
  color: #fff;
  box-shadow: 0 0 15px var(--primary-glow);
}

.logo-text {
  display: flex;
  flex-direction: column;
}

.logo-title {
  font-family: var(--font-display);
  font-size: 1.4rem;
  font-weight: 700;
  background: linear-gradient(to right, #fff, #a5b4fc);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  letter-spacing: -0.5px;
}

.logo-subtitle {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-weight: 500;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.search-box {
  position: relative;
  width: 280px;
}

.search-input {
  width: 100%;
  padding: 0.6rem 1rem 0.6rem 2.4rem;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-main);
  font-size: 0.9rem;
  transition: var(--transition-fast);
}

.search-input:focus {
  outline: none;
  border-color: var(--primary);
  background: rgba(255, 255, 255, 0.08);
  box-shadow: 0 0 12px var(--primary-glow);
}

.search-icon {
  position: absolute;
  left: 0.8rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-dim);
  pointer-events: none;
}

.stat-pill {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 0.9rem;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent-gold);
}

/* App Main Container Grid */
.main-container {
  max-width: 1400px;
  margin: 2rem auto;
  padding: 0 1.5rem;
  display: grid;
  grid-template-columns: 1fr 380px;
  gap: 1.75rem;
}

@media (max-width: 1024px) {
  .main-container {
    grid-template-columns: 1fr;
  }
}

/* Glass Card */
.glass-card {
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.75rem;
  box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
  transition: var(--transition-normal);
}

.glass-card:hover {
  border-color: var(--border-glow);
}

/* Left Column Layout */
.left-content {
  display: flex;
  flex-direction: column;
  gap: 1.75rem;
}

/* Root Header Banner Card */
.root-hero-card {
  position: relative;
  overflow: hidden;
  background: linear-gradient(135deg, rgba(30, 27, 75, 0.8), rgba(15, 23, 42, 0.9));
  border: 1px solid rgba(99, 102, 241, 0.25);
}

.root-hero-card::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 300px;
  height: 300px;
  background: radial-gradient(circle, rgba(168, 85, 247, 0.25), transparent 70%);
  pointer-events: none;
}

.root-hero-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 1.25rem;
}

.badge {
  display: inline-block;
  padding: 0.3rem 0.75rem;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  background: rgba(99, 102, 241, 0.2);
  color: var(--primary-light);
  border: 1px solid rgba(99, 102, 241, 0.3);
}

.root-nav-btns {
  display: flex;
  gap: 0.5rem;
}

.btn-icon {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--transition-fast);
}

.btn-icon:hover {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
  transform: translateY(-2px);
}

.root-title-row {
  display: flex;
  align-items: baseline;
  gap: 1rem;
  margin-bottom: 0.5rem;
  flex-wrap: wrap;
}

.root-name {
  font-family: var(--font-display);
  font-size: 2.2rem;
  font-weight: 700;
  color: #fff;
  letter-spacing: -0.5px;
}

.latin-origin {
  font-size: 1rem;
  color: var(--accent-purple);
  font-style: italic;
}

.root-meanings {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  margin-bottom: 1rem;
}

.meaning-tr {
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--accent-cyan);
}

.meaning-en {
  font-size: 0.95rem;
  color: var(--text-muted);
}

.root-desc {
  font-size: 0.9rem;
  color: var(--text-dim);
  border-top: 1px dashed var(--border-color);
  padding-top: 0.8rem;
  margin-top: 0.5rem;
}

/* Words Derived Section */
.section-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.25rem;
}

.section-title {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

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

.word-card {
  background: rgba(15, 23, 42, 0.6);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  position: relative;
  transition: var(--transition-fast);
}

.word-card:hover {
  background: rgba(30, 41, 59, 0.7);
  border-color: rgba(99, 102, 241, 0.4);
  transform: translateY(-3px);
  box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.5);
}

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

.word-main {
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 700;
  color: #fff;
}

.word-meta {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.8rem;
  color: var(--text-dim);
}

.pos-tag {
  background: rgba(255, 255, 255, 0.08);
  padding: 0.1rem 0.4rem;
  border-radius: 4px;
  font-family: monospace;
}

.btn-tts {
  background: none;
  border: none;
  color: var(--primary-light);
  cursor: pointer;
  font-size: 1.1rem;
  padding: 0.2rem 0.4rem;
  border-radius: var(--radius-sm);
  transition: var(--transition-fast);
}

.btn-tts:hover {
  background: rgba(99, 102, 241, 0.2);
  transform: scale(1.1);
}

.word-tr {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-main);
}

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

.breakdown-box {
  background: rgba(0, 0, 0, 0.25);
  border-radius: var(--radius-sm);
  padding: 0.6rem 0.8rem;
  font-size: 0.8rem;
  line-height: 1.4;
  border: 1px solid rgba(255, 255, 255, 0.04);
}

.prefix {
  color: var(--accent-cyan);
  font-weight: 700;
}

.root {
  color: var(--accent-purple);
  font-weight: 700;
}

.suffix {
  color: var(--accent-gold);
  font-weight: 700;
}

.sentence-box {
  background: rgba(99, 102, 241, 0.08);
  border-left: 3px solid var(--primary);
  padding: 0.6rem 0.8rem;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-size: 0.85rem;
}

.sent-en {
  color: #e2e8f0;
  margin-bottom: 0.2rem;
  font-style: italic;
}

.sent-tr {
  color: var(--text-muted);
  font-size: 0.8rem;
}

/* Visual Etymology Tree Visualizer */
.tree-container {
  background: rgba(10, 15, 30, 0.8);
  border: 1px dashed var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
  overflow-x: auto;
}

.tree-root-node {
  background: linear-gradient(135deg, var(--primary), var(--accent-purple));
  color: #fff;
  padding: 0.75rem 1.75rem;
  border-radius: 30px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.1rem;
  box-shadow: 0 0 20px var(--primary-glow);
  position: relative;
}

.tree-root-node::after {
  content: '';
  position: absolute;
  bottom: -15px;
  left: 50%;
  transform: translateX(-50%);
  width: 2px;
  height: 15px;
  background: var(--primary-light);
}

.tree-branches {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  justify-content: center;
}

.tree-leaf-node {
  background: rgba(30, 41, 59, 0.8);
  border: 1px solid rgba(99, 102, 241, 0.3);
  padding: 0.5rem 1rem;
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  transition: var(--transition-fast);
}

.tree-leaf-node:hover {
  border-color: var(--accent-cyan);
  background: rgba(30, 41, 59, 1);
  transform: scale(1.05);
}

/* Right Sidebar Layout */
.right-sidebar {
  display: flex;
  flex-direction: column;
  gap: 1.75rem;
}

/* Quiz Corner Card */
.quiz-card {
  background: linear-gradient(145deg, rgba(20, 25, 45, 0.9), rgba(15, 23, 42, 0.95));
  border: 1px solid rgba(168, 85, 247, 0.3);
  position: relative;
  overflow: hidden;
}

.quiz-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(to right, var(--primary), var(--accent-purple), var(--accent-cyan));
}

.quiz-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.25rem;
}

.quiz-title-badge {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.1rem;
  color: #fff;
}

.quiz-score-badge {
  background: rgba(168, 85, 247, 0.2);
  border: 1px solid rgba(168, 85, 247, 0.4);
  color: var(--accent-purple);
  padding: 0.25rem 0.6rem;
  border-radius: 12px;
  font-size: 0.8rem;
  font-weight: 700;
}

.quiz-question-box {
  font-size: 1rem;
  font-weight: 600;
  color: #f1f5f9;
  margin-bottom: 1.25rem;
  line-height: 1.5;
}

.quiz-options {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-bottom: 1.25rem;
}

.quiz-opt-btn {
  width: 100%;
  text-align: left;
  padding: 0.8rem 1rem;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-main);
  font-size: 0.9rem;
  cursor: pointer;
  transition: var(--transition-fast);
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.quiz-opt-btn:hover:not(:disabled) {
  background: rgba(99, 102, 241, 0.15);
  border-color: var(--primary-light);
  transform: translateX(4px);
}

.quiz-opt-btn.correct {
  background: rgba(16, 185, 129, 0.2) !important;
  border-color: var(--accent-green) !important;
  color: #a7f3d0 !important;
}

.quiz-opt-btn.wrong {
  background: rgba(239, 68, 68, 0.2) !important;
  border-color: var(--accent-red) !important;
  color: #fecaca !important;
}

.quiz-feedback {
  background: rgba(0, 0, 0, 0.3);
  border-radius: var(--radius-sm);
  padding: 0.75rem 1rem;
  font-size: 0.85rem;
  margin-bottom: 1rem;
  display: none;
}

.quiz-feedback.show {
  display: block;
  animation: fadeIn 0.3s ease;
}

.quiz-next-btn {
  width: 100%;
  padding: 0.75rem;
  background: linear-gradient(135deg, var(--primary), var(--accent-purple));
  border: none;
  border-radius: var(--radius-sm);
  color: #fff;
  font-weight: 700;
  font-size: 0.95rem;
  cursor: pointer;
  transition: var(--transition-fast);
  box-shadow: 0 4px 15px var(--primary-glow);
}

.quiz-next-btn:hover {
  opacity: 0.9;
  transform: translateY(-2px);
}

/* Root Selector List */
.root-selector-list {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  max-height: 340px;
  overflow-y: auto;
  padding-right: 0.3rem;
}

.root-selector-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.75rem 1rem;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: var(--transition-fast);
}

.root-selector-item:hover {
  background: rgba(255, 255, 255, 0.07);
  border-color: rgba(99, 102, 241, 0.3);
}

.root-selector-item.active {
  background: rgba(99, 102, 241, 0.2);
  border-color: var(--primary);
}

.item-root-name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.95rem;
  color: #fff;
}

.item-root-tr {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.item-count {
  font-size: 0.75rem;
  background: rgba(255, 255, 255, 0.1);
  padding: 0.15rem 0.5rem;
  border-radius: 10px;
  color: var(--text-dim);
}

/* Animations */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

.fade-in {
  animation: fadeIn 0.4s ease forwards;
}

/* Footer */
footer {
  text-align: center;
  padding: 2rem 1rem;
  color: var(--text-dim);
  font-size: 0.85rem;
  border-top: 1px solid var(--border-color);
  margin-top: 3rem;
}