@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Playfair+Display:ital,wght@0,500;0,700;1,400&family=Plus+Jakarta+Sans:wght@400;500;600;700;800&display=swap');

/* ==========================================
   CSS VARIABLES & DESIGN SYSTEM
   ========================================== */
:root {
  /* Colors */
  --bg-dark: #07090c;
  --bg-darker: #040507;
  --bg-card: rgba(15, 18, 25, 0.7);
  --bg-glass: rgba(10, 12, 16, 0.65);
  
  --accent-gold: #e5b842;
  --accent-gold-rgb: 229, 184, 66;
  --accent-gold-hover: #f1c95c;
  
  --accent-emerald: #0df0ca;
  --accent-emerald-rgb: 13, 240, 202;
  --accent-emerald-hover: #3efad9;

  --accent-purple: #9d4edd;
  
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  
  --border-light: rgba(255, 255, 255, 0.06);
  --border-hover: rgba(255, 255, 255, 0.12);
  --border-gold: rgba(229, 184, 66, 0.25);
  --border-emerald: rgba(13, 240, 202, 0.25);
  
  /* Fonts */
  --font-sans: 'Inter', sans-serif;
  --font-title: 'Plus Jakarta Sans', sans-serif;
  --font-serif: 'Playfair Display', serif;
  
  /* Transitions */
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.8s cubic-bezier(0.4, 0, 0.2, 1);
  
  /* Shadow */
  --shadow-neon-gold: 0 0 20px rgba(229, 184, 66, 0.15);
  --shadow-neon-emerald: 0 0 20px rgba(13, 240, 202, 0.15);
  --shadow-box: 0 10px 30px -10px rgba(0, 0, 0, 0.7);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  background-color: var(--bg-darker);
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-dark);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  position: relative;
  -webkit-font-smoothing: antialiased;
}

/* Background Animated Orbs */
.bg-glow-container {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: -2;
  overflow: hidden;
  pointer-events: none;
}

.bg-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(120px);
  opacity: 0.15;
  mix-blend-mode: screen;
  animation: orbFloat 25s infinite alternate ease-in-out;
}

.bg-orb-1 {
  top: -10%;
  right: -10%;
  width: 50vw;
  height: 50vw;
  background: radial-gradient(circle, rgba(var(--accent-gold-rgb), 0.5) 0%, rgba(0,0,0,0) 70%);
}

.bg-orb-2 {
  bottom: -20%;
  left: -10%;
  width: 60vw;
  height: 60vw;
  background: radial-gradient(circle, rgba(var(--accent-emerald-rgb), 0.5) 0%, rgba(0,0,0,0) 70%);
  animation-duration: 35s;
  animation-delay: -5s;
}

.bg-orb-3 {
  top: 40%;
  right: 25%;
  width: 35vw;
  height: 35vw;
  background: radial-gradient(circle, rgba(157, 78, 221, 0.4) 0%, rgba(0,0,0,0) 70%);
  animation-duration: 30s;
  animation-delay: -10s;
}

@keyframes orbFloat {
  0% {
    transform: translate(0, 0) scale(1);
  }
  100% {
    transform: translate(8%, 8%) scale(1.15);
  }
}

/* Scrollbar Style */
::-webkit-scrollbar {
  width: 8px;
}
::-webkit-scrollbar-track {
  background: var(--bg-darker);
}
::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.1);
  border-radius: 4px;
  transition: var(--transition-fast);
}
::-webkit-scrollbar-thumb:hover {
  background: var(--accent-gold);
}

a {
  color: inherit;
  text-decoration: none;
  transition: var(--transition-fast);
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

button {
  cursor: pointer;
  border: none;
  background: none;
  font-family: inherit;
  color: inherit;
  transition: var(--transition-fast);
}

/* ==========================================
   TYPOGRAPHY UTILITIES
   ========================================== */
.gradient-text {
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.gradient-gold-cyan {
  background-image: linear-gradient(135deg, var(--accent-gold) 0%, var(--accent-emerald) 100%);
}

.gradient-gold {
  background-image: linear-gradient(135deg, #ffe082 0%, var(--accent-gold) 100%);
}

.gradient-cyan {
  background-image: linear-gradient(135deg, var(--accent-emerald) 0%, #00bbf9 100%);
}

.serif-title {
  font-family: var(--font-serif);
  font-style: italic;
}

/* ==========================================
   LAYOUT CONTAINERS
   ========================================== */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.section {
  padding: 8rem 0;
  position: relative;
}

.section-header {
  text-align: center;
  margin-bottom: 4.5rem;
}

.section-tag {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  font-weight: 700;
  color: var(--accent-gold);
  margin-bottom: 0.75rem;
  display: inline-block;
}

.section-title {
  font-family: var(--font-title);
  font-size: 2.75rem;
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 1.25rem;
}

.section-desc {
  font-size: 1.125rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

/* ==========================================
   BUTTONS & CTAS
   ========================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.875rem 2rem;
  border-radius: 50px;
  font-family: var(--font-title);
  font-weight: 600;
  font-size: 0.95rem;
  letter-spacing: 0.02em;
  gap: 0.75rem;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-box);
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent-gold) 0%, #d49520 100%);
  color: var(--bg-darker);
}

.btn-primary::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, var(--accent-gold-hover) 0%, var(--accent-gold) 100%);
  opacity: 0;
  transition: opacity var(--transition-fast);
  z-index: 1;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 20px -5px rgba(var(--accent-gold-rgb), 0.3);
}

.btn-primary:hover::before {
  opacity: 1;
}

.btn-primary span, .btn-primary i {
  position: relative;
  z-index: 2;
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-light);
  color: var(--text-primary);
  backdrop-filter: blur(5px);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.07);
  border-color: var(--accent-emerald);
  transform: translateY(-2px);
  box-shadow: 0 10px 20px -5px rgba(var(--accent-emerald-rgb), 0.15);
}

.btn-icon {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-light);
}

.btn-icon:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: var(--accent-gold);
  color: var(--accent-gold);
  transform: translateY(-2px);
}

/* ==========================================
   HEADER / NAVBAR
   ========================================== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 100;
  transition: var(--transition-normal);
  border-bottom: 1px solid transparent;
}

.header-scrolled {
  background: var(--bg-glass);
  backdrop-filter: blur(15px);
  border-bottom: 1px solid var(--border-light);
  padding: 0.5rem 0;
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.25rem 0;
  transition: var(--transition-normal);
}

.header-scrolled .nav-container {
  padding: 0.75rem 0;
}

.logo {
  font-family: var(--font-title);
  font-weight: 800;
  font-size: 1.5rem;
  letter-spacing: -0.02em;
}

.logo span {
  color: var(--accent-gold);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 2.5rem;
  list-style: none;
}

.nav-link {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  position: relative;
  padding: 0.25rem 0;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 1.5px;
  background-color: var(--accent-gold);
  transition: width var(--transition-fast);
}

.nav-link:hover {
  color: var(--text-primary);
}

.nav-link:hover::after {
  width: 100%;
}

.nav-cta {
  display: flex;
  align-items: center;
}

.mobile-menu-btn {
  display: none;
  font-size: 1.5rem;
}

/* ==========================================
   HERO SECTION
   ========================================== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 7rem;
  overflow: hidden;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  align-items: center;
  gap: 4rem;
}

.hero-content {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1.25rem;
  background: rgba(229, 184, 66, 0.08);
  border: 1px solid rgba(229, 184, 66, 0.15);
  border-radius: 50px;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  color: var(--accent-gold);
  margin-bottom: 1.5rem;
}

.hero-badge i {
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0% { transform: scale(1); opacity: 0.8; }
  50% { transform: scale(1.2); opacity: 1; }
  100% { transform: scale(1); opacity: 0.8; }
}

.hero-title {
  font-family: var(--font-title);
  font-size: 4rem;
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.01em;
  margin-bottom: 1.5rem;
}

.hero-title span {
  display: block;
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--text-secondary);
  margin-bottom: 2.5rem;
  max-width: 520px;
}

.hero-btns {
  display: flex;
  gap: 1.25rem;
  margin-bottom: 3rem;
}

.hero-stats {
  display: flex;
  gap: 3.5rem;
  border-top: 1px solid var(--border-light);
  padding-top: 2rem;
  width: 100%;
}

.stat-item {
  display: flex;
  flex-direction: column;
}

.stat-number {
  font-family: var(--font-title);
  font-size: 2.25rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1;
  margin-bottom: 0.35rem;
}

.stat-number span {
  color: var(--accent-gold);
}

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

.hero-image-container {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
}

.hero-image-wrapper {
  position: relative;
  width: 100%;
  max-width: 450px;
  aspect-ratio: 4/5;
  border-radius: 24px;
  overflow: hidden;
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-box);
  animation: floatImage 6s infinite ease-in-out;
}

.hero-image-wrapper::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(7, 9, 12, 0.9) 0%, rgba(7, 9, 12, 0) 40%);
  z-index: 1;
}

.hero-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.hero-image-wrapper:hover .hero-image {
  transform: scale(1.05);
}

.hero-card-floating {
  position: absolute;
  background: var(--bg-glass);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-light);
  border-radius: 16px;
  padding: 1.25rem;
  display: flex;
  align-items: center;
  gap: 1rem;
  box-shadow: var(--shadow-box);
}

.hero-card-1 {
  bottom: 8%;
  left: -10%;
  border-left: 3px solid var(--accent-gold);
  z-index: 2;
}

.hero-card-2 {
  top: 15%;
  right: -8%;
  border-left: 3px solid var(--accent-emerald);
  z-index: 2;
}

.hero-card-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: rgba(255,255,255,0.04);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
}

.hero-card-1 .hero-card-icon { color: var(--accent-gold); }
.hero-card-2 .hero-card-icon { color: var(--accent-emerald); }

.hero-card-info h4 {
  font-family: var(--font-title);
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 0.15rem;
}

.hero-card-info p {
  font-size: 0.75rem;
  color: var(--text-secondary);
}

@keyframes floatImage {
  0% { transform: translateY(0); }
  50% { transform: translateY(-15px); }
  100% { transform: translateY(0); }
}

/* ==========================================
   ABOUT SECTION (TABS)
   ========================================== */
.about-grid {
  display: grid;
  grid-template-columns: 0.95fr 1.05fr;
  gap: 5rem;
  align-items: center;
}

.about-visual {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.about-quote-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: 20px;
  padding: 2.5rem;
  position: relative;
  box-shadow: var(--shadow-box);
}

.about-quote-card::before {
  content: "“";
  position: absolute;
  top: 10px;
  left: 20px;
  font-family: var(--font-serif);
  font-size: 7rem;
  color: rgba(255,255,255,0.03);
  line-height: 1;
}

.quote-text {
  font-family: var(--font-serif);
  font-size: 1.35rem;
  line-height: 1.5;
  color: var(--text-primary);
  margin-bottom: 1.5rem;
  position: relative;
  z-index: 1;
}

.quote-author {
  font-family: var(--font-title);
  font-size: 0.95rem;
  font-weight: 600;
}

.quote-author span {
  display: block;
  font-size: 0.8rem;
  font-weight: 400;
  color: var(--text-secondary);
}

.about-tabs-nav {
  display: flex;
  gap: 1rem;
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--border-light);
  padding: 0.5rem;
  border-radius: 12px;
  margin-bottom: 2.5rem;
}

.tab-btn {
  flex: 1;
  padding: 0.875rem 1rem;
  border-radius: 8px;
  font-family: var(--font-title);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}

.tab-btn:hover {
  color: var(--text-primary);
}

.tab-btn.active {
  background: rgba(255, 255, 255, 0.06);
  color: var(--text-primary);
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.1);
}

.tab-btn.active[data-tab="music"] {
  border-bottom: 2px solid var(--accent-gold);
}

.tab-btn.active[data-tab="edu"] {
  border-bottom: 2px solid var(--accent-emerald);
}

.tab-btn.active[data-tab="lit"] {
  border-bottom: 2px solid var(--accent-purple);
}

.tab-panel {
  display: none;
  animation: fadeIn 0.4s ease-in-out forwards;
}

.tab-panel.active {
  display: block;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.tab-panel h3 {
  font-family: var(--font-title);
  font-size: 1.8rem;
  font-weight: 700;
  margin-bottom: 1.25rem;
}

.tab-panel p {
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.5rem;
}

.tag-item {
  padding: 0.4rem 1rem;
  border-radius: 50px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-light);
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-secondary);
}

.tab-panel[data-tab-content="music"] .tag-item:hover {
  border-color: var(--accent-gold);
  color: var(--accent-gold);
}
.tab-panel[data-tab-content="edu"] .tag-item:hover {
  border-color: var(--accent-emerald);
  color: var(--accent-emerald);
}
.tab-panel[data-tab-content="lit"] .tag-item:hover {
  border-color: var(--accent-purple);
  color: var(--accent-purple);
}

/* ==========================================
   PRODUCTS SECTION (FILTERS)
   ========================================== */
.product-filters {
  display: flex;
  justify-content: center;
  gap: 1rem;
  margin-bottom: 3.5rem;
}

.filter-btn {
  padding: 0.6rem 1.75rem;
  border-radius: 50px;
  border: 1px solid var(--border-light);
  font-family: var(--font-title);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.filter-btn:hover {
  color: var(--text-primary);
  border-color: var(--border-hover);
}

.filter-btn.active {
  background: var(--text-primary);
  color: var(--bg-darker);
  border-color: var(--text-primary);
}

.products-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 2rem;
}

.product-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: 20px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: transform var(--transition-normal), border-color var(--transition-normal);
  box-shadow: var(--shadow-box);
}

.product-card:hover {
  transform: translateY(-8px);
  border-color: var(--border-hover);
}

.product-card.gold-border:hover {
  border-color: var(--accent-gold);
  box-shadow: var(--shadow-neon-gold), var(--shadow-box);
}

.product-card.emerald-border:hover {
  border-color: var(--accent-emerald);
  box-shadow: var(--shadow-neon-emerald), var(--shadow-box);
}

.product-card.purple-border:hover {
  border-color: var(--accent-purple);
  box-shadow: 0 0 20px rgba(157, 78, 221, 0.15), var(--shadow-box);
}

.product-img-wrapper {
  position: relative;
  aspect-ratio: 16/10;
  overflow: hidden;
  background-color: rgba(255, 255, 255, 0.02);
}

.product-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-normal);
}

.product-card:hover .product-img {
  transform: scale(1.04);
}

.product-tag {
  position: absolute;
  top: 1.25rem;
  left: 1.25rem;
  padding: 0.35rem 0.85rem;
  border-radius: 50px;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  backdrop-filter: blur(8px);
}

.tag-music {
  background: rgba(229, 184, 66, 0.15);
  border: 1px solid rgba(229, 184, 66, 0.3);
  color: var(--accent-gold);
}

.tag-book {
  background: rgba(157, 78, 221, 0.15);
  border: 1px solid rgba(157, 78, 221, 0.3);
  color: #c77dff;
}

.product-info {
  padding: 2rem;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.product-title {
  font-family: var(--font-title);
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
  line-height: 1.3;
}

.product-desc {
  font-size: 0.95rem;
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
  flex-grow: 1;
}

.product-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid var(--border-light);
  padding-top: 1.25rem;
  margin-top: auto;
}

.product-price {
  display: flex;
  flex-direction: column;
}

.price-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
}

.price-value {
  font-family: var(--font-title);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
}

.price-value.highlight {
  color: var(--accent-gold);
}

.btn-buy {
  padding: 0.6rem 1.25rem;
  font-size: 0.85rem;
  border-radius: 50px;
  font-weight: 600;
}

/* ==========================================
   WIDGET INTERATIVO (VIOLÃO VIRTUAL)
   ========================================== */
.guitar-widget-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: 24px;
  padding: 3rem;
  box-shadow: var(--shadow-box);
  overflow: hidden;
  position: relative;
}

.guitar-widget-card::before {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 200px;
  height: 200px;
  background: radial-gradient(circle, rgba(var(--accent-gold-rgb), 0.08) 0%, rgba(0,0,0,0) 70%);
  pointer-events: none;
}

.widget-grid {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
  gap: 3.5rem;
  align-items: center;
}

.widget-text h3 {
  font-family: var(--font-title);
  font-size: 2rem;
  font-weight: 800;
  margin-bottom: 1rem;
}

.widget-text p {
  color: var(--text-secondary);
  margin-bottom: 1.75rem;
}

.challenge-selector {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-bottom: 2rem;
}

.challenge-option {
  padding: 1rem 1.25rem;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--border-light);
  text-align: left;
  display: flex;
  align-items: center;
  gap: 1rem;
}

.challenge-option:hover {
  background: rgba(255, 255, 255, 0.04);
  border-color: rgba(var(--accent-gold-rgb), 0.3);
}

.challenge-option.active {
  background: rgba(var(--accent-gold-rgb), 0.06);
  border-color: var(--accent-gold);
}

.opt-num {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: rgba(255,255,255,0.05);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--text-secondary);
}

.challenge-option.active .opt-num {
  background: var(--accent-gold);
  color: var(--bg-darker);
}

.opt-title {
  font-family: var(--font-title);
  font-size: 0.95rem;
  font-weight: 600;
}

.opt-desc {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-left: auto;
}

/* Fretboard Interface */
.guitar-fretboard-container {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.fretboard-window {
  width: 100%;
  background: #17120e;
  border: 4px solid #28211b;
  border-radius: 12px;
  padding: 1rem 0;
  position: relative;
  box-shadow: inset 0 0 20px rgba(0,0,0,0.8);
  overflow-x: auto;
}

.fretboard {
  display: flex;
  flex-direction: column;
  position: relative;
  width: 100%;
  min-width: 500px;
  height: 180px;
}

/* Fret Lines */
.frets-layer {
  position: absolute;
  inset: 0;
  display: flex;
  justify-content: space-between;
  pointer-events: none;
}

.fret-line {
  width: 2px;
  height: 100%;
  background: linear-gradient(to bottom, #7f7f7f, #535353, #7f7f7f);
  position: relative;
}

.fret-line::after {
  content: attr(data-fret);
  position: absolute;
  bottom: -22px;
  left: 50%;
  transform: translateX(-50%);
  font-size: 0.7rem;
  color: var(--text-muted);
  font-weight: 600;
}

.fret-marker {
  position: absolute;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: #463b33;
  top: 50%;
  transform: translate(-50%, -50%);
}

/* Guitar Strings */
.strings-layer {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 8px 0;
  pointer-events: none;
}

.guitar-string {
  width: 100%;
  background: linear-gradient(to bottom, #dcdcdc, #8e8e8e, #dcdcdc);
  box-shadow: 0 1px 2px rgba(0,0,0,0.4);
}

.string-6 { height: 3.5px; background: linear-gradient(to bottom, #e5b842, #84671e, #e5b842); }
.string-5 { height: 3.0px; background: linear-gradient(to bottom, #e5b842, #84671e, #e5b842); }
.string-4 { height: 2.5px; background: linear-gradient(to bottom, #e5b842, #84671e, #e5b842); }
.string-3 { height: 2.0px; }
.string-2 { height: 1.5px; }
.string-1 { height: 1.0px; }

/* Interactive Note Dots */
.notes-layer {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 0;
}

.notes-string-row {
  height: 30px;
  display: flex;
  align-items: center;
  position: relative;
}

.note-trigger {
  position: absolute;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.1);
  border: 1.5px solid rgba(255, 255, 255, 0.3);
  transform: translateX(-50%);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.65rem;
  font-weight: 800;
  color: transparent;
  transition: transform var(--transition-fast), background var(--transition-fast), border-color var(--transition-fast);
  z-index: 10;
}

.note-trigger:hover {
  background: rgba(255, 255, 255, 0.25);
  transform: translateX(-50%) scale(1.15);
  color: var(--text-primary);
}

.note-trigger.active-note {
  background: var(--accent-gold);
  border-color: #fff;
  color: var(--bg-darker);
  box-shadow: 0 0 15px var(--accent-gold);
  transform: translateX(-50%) scale(1.2);
}

.note-trigger.chord-note {
  background: var(--accent-emerald);
  border-color: #fff;
  color: var(--bg-darker);
  box-shadow: 0 0 15px var(--accent-emerald);
  transform: translateX(-50%) scale(1.2);
}

.widget-controls {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 0.5rem;
}

.audio-status {
  font-size: 0.8rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.audio-status i {
  color: var(--accent-emerald);
}

.tab-notation-display {
  background: rgba(0,0,0,0.3);
  border-radius: 8px;
  padding: 1rem;
  border: 1px solid var(--border-light);
  font-family: monospace;
  font-size: 0.85rem;
  color: var(--accent-gold);
  letter-spacing: 0.1em;
  white-space: pre;
  overflow-x: auto;
}

/* ==========================================
   YOUTUBE SHOWCASE SECTION
   ========================================== */
.youtube-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.youtube-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: 16px;
  overflow: hidden;
  box-shadow: var(--shadow-box);
  display: flex;
  flex-direction: column;
}

.video-thumb-wrapper {
  position: relative;
  aspect-ratio: 16/9;
  overflow: hidden;
  background-color: #000;
}

.video-thumb {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.8;
  transition: transform var(--transition-normal), opacity var(--transition-normal);
}

.youtube-card:hover .video-thumb {
  transform: scale(1.03);
  opacity: 0.95;
}

.play-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0,0,0,0.2);
  transition: background var(--transition-normal);
}

.youtube-card:hover .play-overlay {
  background: rgba(0,0,0,0.4);
}

.play-btn-circle {
  width: 54px;
  height: 54px;
  border-radius: 50%;
  background: var(--text-primary);
  color: var(--bg-darker);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.15rem;
  box-shadow: 0 4px 15px rgba(0,0,0,0.5);
  transition: transform var(--transition-fast), background var(--transition-fast);
}

.youtube-card:hover .play-btn-circle {
  transform: scale(1.1);
  background: var(--accent-gold);
}

.video-length {
  position: absolute;
  bottom: 0.75rem;
  right: 0.75rem;
  background: rgba(0,0,0,0.8);
  padding: 0.15rem 0.4rem;
  border-radius: 4px;
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--text-primary);
}

.video-info {
  padding: 1.5rem;
}

.video-title {
  font-family: var(--font-title);
  font-size: 1.05rem;
  font-weight: 700;
  line-height: 1.4;
  margin-bottom: 0.5rem;
}

.video-views {
  font-size: 0.75rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

/* ==========================================
   CONTACT & NEWSLETTER SECTION
   ========================================== */
.contact-grid {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 5rem;
  align-items: start;
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.contact-header h2 {
  font-family: var(--font-title);
  font-size: 2.5rem;
  font-weight: 800;
  margin-bottom: 1rem;
}

.contact-header p {
  color: var(--text-secondary);
}

.contact-channels {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.channel-card {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  padding: 1.25rem;
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: 16px;
}

.channel-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: rgba(255,255,255,0.03);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  color: var(--accent-gold);
}

.channel-info h4 {
  font-family: var(--font-title);
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 0.15rem;
}

.channel-info p {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.channel-card:hover {
  border-color: rgba(var(--accent-gold-rgb), 0.3);
}

.contact-form-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: 24px;
  padding: 3rem;
  box-shadow: var(--shadow-box);
}

.form-group {
  margin-bottom: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.form-group label {
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-secondary);
}

.form-input {
  width: 100%;
  padding: 0.875rem 1.25rem;
  background: rgba(0, 0, 0, 0.2);
  border: 1px solid var(--border-light);
  border-radius: 12px;
  color: var(--text-primary);
  font-family: inherit;
  font-size: 0.95rem;
  transition: var(--transition-fast);
}

.form-input:focus {
  outline: none;
  border-color: var(--accent-gold);
  background: rgba(0, 0, 0, 0.4);
  box-shadow: 0 0 10px rgba(var(--accent-gold-rgb), 0.1);
}

textarea.form-input {
  resize: vertical;
  min-height: 120px;
}

/* ==========================================
   FOOTER
   ========================================== */
.footer {
  border-top: 1px solid var(--border-light);
  background: var(--bg-darker);
  padding: 4rem 0 2rem;
}

.footer-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 3rem;
}

.footer-socials {
  display: flex;
  gap: 1rem;
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--text-muted);
  font-size: 0.85rem;
}

.footer-links {
  display: flex;
  gap: 2rem;
  list-style: none;
}

.footer-link:hover {
  color: var(--text-secondary);
}

/* ==========================================
   SCROLL ANIMATION UTILITIES (Intersection Observer)
   ========================================== */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s cubic-bezier(0.4, 0, 0.2, 1), transform 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

.reveal.revealed {
  opacity: 1;
  transform: translateY(0);
}

.reveal-delay-1 { transition-delay: 0.15s; }
.reveal-delay-2 { transition-delay: 0.3s; }
.reveal-delay-3 { transition-delay: 0.45s; }

/* ==========================================
   RESPONSIVE DESIGN (MEDIA QUERIES)
   ========================================== */
@media (max-width: 1024px) {
  .hero-title {
    font-size: 3.25rem;
  }
  
  .hero-grid, .about-grid, .widget-grid, .contact-grid {
    gap: 3rem;
  }
}

@media (max-width: 968px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 4rem;
  }
  
  .hero-content {
    align-items: center;
    text-align: center;
  }
  
  .hero-badge, .hero-btns {
    align-self: center;
  }
  
  .hero-subtitle {
    max-width: 100%;
  }
  
  .hero-stats {
    justify-content: center;
  }
  
  .hero-image-container {
    order: unset;
  }
  
  .about-grid, .widget-grid, .contact-grid {
    grid-template-columns: 1fr;
  }
  
  .about-visual {
    order: 2;
  }
  
  .youtube-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .nav-links, .nav-cta {
    display: none; /* Mobile navigation toggler needed in future or simplified stack */
  }
  
  .mobile-menu-btn {
    display: block;
  }
}

@media (max-width: 640px) {
  .hero-card-1 {
    bottom: 4%;
    left: 10px;
  }
  
  .hero-card-2 {
    top: 4%;
    right: 10px;
  }
  
  .hero-card-floating {
    padding: 0.65rem 0.85rem;
    gap: 0.6rem;
    border-radius: 12px;
  }
  
  .hero-card-icon {
    width: 36px;
    height: 36px;
    font-size: 1rem;
    border-radius: 8px;
  }
  
  .hero-card-info h4 {
    font-size: 0.85rem;
  }
  
  .hero-card-info p {
    font-size: 0.7rem;
  }

  .section {
    padding: 5rem 0;
  }
  
  .hero-title {
    font-size: 2.5rem;
  }
  
  .hero-btns {
    flex-direction: column;
    width: 100%;
  }
  
  .btn {
    width: 100%;
  }
  
  .hero-stats {
    flex-wrap: wrap;
    gap: 2rem;
  }
  
  .youtube-grid {
    grid-template-columns: 1fr;
  }
  
  .guitar-widget-card {
    padding: 1.5rem;
  }
  
  .fretboard-window {
    padding: 0.5rem 0;
  }
  
  .contact-form-card {
    padding: 1.5rem;
  }
  
  .footer-top {
    flex-direction: column;
    gap: 2rem;
    align-items: center;
  }
  
  .footer-bottom {
    flex-direction: column;
    gap: 1.5rem;
    text-align: center;
  }
  
  .footer-links {
    flex-direction: column;
    gap: 1rem;
  }
}

.about-teacher-photo:hover {
  border-color: var(--accent-gold) !important;
  box-shadow: var(--shadow-neon-gold), var(--shadow-box) !important;
}