/* ========================================================
   Midnight Studio Theme - guitartuner.si
   Studio-Grade OLED Dark Mode & Light Mode CSS
   ======================================================== */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&family=JetBrains+Mono:wght@400;500;600;700&family=Space+Grotesk:wght@500;700&display=swap');

:root {
  /* Midnight Studio OLED Dark Theme (Default) */
  --bg-primary: #0B0F17;
  --bg-secondary: #0F1626;
  --card-surface: #131B2E;
  --card-surface-hover: #19233C;
  --border-subtle: #1E293B;
  --border-glow: rgba(56, 189, 248, 0.25);
  
  --text-primary: #F8FAFC;
  --text-secondary: #94A3B8;
  --text-muted: #64748B;
  
  /* Status Color Zones */
  --color-in-tune: #00E676;       /* ±3 cents vibrant emerald */
  --color-in-tune-glow: rgba(0, 230, 118, 0.4);
  --color-close: #FFB300;         /* Warm Amber */
  --color-close-glow: rgba(255, 179, 0, 0.3);
  --color-flat-sharp: #FF5252;     /* Coral Red */
  --color-flat-sharp-glow: rgba(255, 82, 82, 0.3);
  --color-accent: #38BDF8;         /* Electric Sky Blue */
  --color-accent-glow: rgba(56, 189, 248, 0.4);

  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-display: 'Space Grotesk', var(--font-sans);
  --font-mono: 'JetBrains Mono', monospace;

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;

  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s ease;
  --transition-spring: 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

/* Light Mode Overrides */
[data-theme="light"] {
  --bg-primary: #F8FAFC;
  --bg-secondary: #F1F5F9;
  --card-surface: #FFFFFF;
  --card-surface-hover: #F8FAFC;
  --border-subtle: #E2E8F0;
  --border-glow: rgba(56, 189, 248, 0.3);
  
  --text-primary: #0F172A;
  --text-secondary: #475569;
  --text-muted: #64748B;
  
  --color-in-tune: #059669;
  --color-in-tune-glow: rgba(5, 150, 105, 0.25);
  --color-close: #D97706;
  --color-close-glow: rgba(217, 119, 6, 0.25);
  --color-flat-sharp: #DC2626;
  --color-flat-sharp-glow: rgba(220, 38, 38, 0.25);
  --color-accent: #0284C7;
  --color-accent-glow: rgba(2, 132, 199, 0.3);
}

/* Base Reset */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-sans);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color var(--transition-fast);
}
a:hover {
  text-decoration: underline;
}

/* Container */
.container {
  width: 100%;
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 1.25rem;
}
.container-narrow {
  max-width: 860px;
}

/* ========================================================
   Header & Navbar
   ======================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(11, 15, 23, 0.85);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border-subtle);
}
[data-theme="light"] .site-header {
  background: rgba(255, 255, 255, 0.9);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--text-primary);
  text-decoration: none;
  letter-spacing: -0.02em;
}
.brand-logo svg {
  width: 28px;
  height: 28px;
}
.brand-logo .dot-tld {
  color: var(--color-accent);
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 0.35rem;
}
.nav-link {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.45rem 0.85rem;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  transition: all var(--transition-fast);
}
.nav-link:hover, .nav-link.active {
  color: var(--text-primary);
  background: var(--card-surface);
  text-decoration: none;
}
.nav-link.active {
  color: var(--color-accent);
  border: 1px solid var(--border-subtle);
}

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

.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: var(--radius-sm);
  background: var(--card-surface);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}
.icon-btn:hover {
  color: var(--text-primary);
  border-color: var(--color-accent);
}
.icon-btn.active {
  background: rgba(56, 189, 248, 0.15);
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.pwa-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.45rem 0.85rem;
  font-size: 0.85rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  background: var(--card-surface);
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
  cursor: pointer;
  transition: all var(--transition-fast);
}
.pwa-btn:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

/* ========================================================
   Hero Section & Instruments
   ======================================================== */
.hero-section {
  padding: 1.5rem 0 2rem;
}
.hero-header {
  text-align: center;
  margin-bottom: 1.25rem;
}
.hero-title {
  font-family: var(--font-display);
  font-size: 2.25rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--text-primary);
  margin-bottom: 0.35rem;
}
.hero-subtitle {
  font-size: 1.05rem;
  color: var(--text-secondary);
}

/* Instrument Selection Cards */
.instrument-bar {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.65rem;
  margin-bottom: 1.25rem;
}
.instrument-card {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.55rem 1rem;
  border-radius: var(--radius-md);
  background: var(--card-surface);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
}
.instrument-card:hover {
  border-color: var(--color-accent);
  color: var(--text-primary);
  transform: translateY(-1px);
}
.instrument-card.active {
  background: rgba(56, 189, 248, 0.12);
  border-color: var(--color-accent);
  color: var(--color-accent);
  box-shadow: 0 0 15px rgba(56, 189, 248, 0.2);
}

/* Tuning Presets Row */
.tuning-preset-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
}
.tuning-select {
  background: var(--card-surface);
  color: var(--text-primary);
  border: 1px solid var(--border-subtle);
  padding: 0.5rem 1.25rem;
  border-radius: var(--radius-sm);
  font-family: var(--font-sans);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  outline: none;
  transition: border-color var(--transition-fast);
  max-width: 320px;
}
.tuning-select:focus {
  border-color: var(--color-accent);
}
.custom-tuning-btn {
  background: transparent;
  color: var(--color-accent);
  border: 1px dashed var(--color-accent);
  padding: 0.5rem 0.85rem;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
}
.custom-tuning-btn:hover {
  background: rgba(56, 189, 248, 0.1);
}

/* ========================================================
   Glassmorphic Tuner Card
   ======================================================== */
.tuner-card {
  background: var(--card-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 2rem 1.75rem;
  box-shadow: 0 20px 40px -15px rgba(0, 0, 0, 0.5);
  position: relative;
  overflow: hidden;
  max-width: 820px;
  margin: 0 auto 1.5rem;
}
.tuner-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--color-accent), transparent);
}

/* Analog Needle & LED Gauge */
.gauge-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  position: relative;
  margin: 0.5rem auto 1.5rem;
  width: 100%;
  max-width: 440px;
}

.gauge-svg {
  width: 100%;
  max-width: 380px;
  height: auto;
  overflow: visible;
}

/* Central Note Display */
.note-readout-wrap {
  text-align: center;
  margin-top: -30px;
  margin-bottom: 1.25rem;
}
.target-note-name {
  font-family: var(--font-display);
  font-size: 4.5rem;
  font-weight: 800;
  line-height: 1;
  color: var(--text-primary);
  letter-spacing: -0.04em;
  transition: color var(--transition-fast), transform var(--transition-spring);
  text-shadow: 0 0 20px rgba(0,0,0,0.5);
}
.target-note-name.in-tune {
  color: var(--color-in-tune);
  text-shadow: 0 0 25px var(--color-in-tune-glow);
  transform: scale(1.05);
}
.target-note-name.close {
  color: var(--color-close);
  text-shadow: 0 0 20px var(--color-close-glow);
}
.target-note-name.off-pitch {
  color: var(--color-flat-sharp);
  text-shadow: 0 0 20px var(--color-flat-sharp-glow);
}

.hz-cents-bar {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1.25rem;
  font-family: var(--font-mono);
  font-feature-settings: "tnum";
  font-variant-numeric: tabular-nums;
  margin-top: 0.5rem;
}
.live-hz {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--text-secondary);
}
.live-cents {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-muted);
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.04);
}
.live-cents.in-tune {
  color: var(--color-in-tune);
  background: rgba(0, 230, 118, 0.12);
}
.live-cents.close {
  color: var(--color-close);
  background: rgba(255, 179, 0, 0.12);
}
.live-cents.off-pitch {
  color: var(--color-flat-sharp);
  background: rgba(255, 82, 82, 0.12);
}

.status-badge {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 0.25rem 0.8rem;
  border-radius: var(--radius-full);
  margin-top: 0.4rem;
  background: var(--border-subtle);
  color: var(--text-secondary);
}
.status-badge.in-tune {
  background: var(--color-in-tune);
  color: #000;
  box-shadow: 0 0 15px var(--color-in-tune-glow);
}
.status-badge.flat {
  background: var(--color-flat-sharp);
  color: #fff;
}
.status-badge.sharp {
  background: var(--color-flat-sharp);
  color: #fff;
}

/* Centered Tactile Mic Button */
.mic-control-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  margin: 1.25rem 0 1.5rem;
}
.mic-btn {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  padding: 0.95rem 2.25rem;
  font-size: 1.1rem;
  font-weight: 700;
  border-radius: var(--radius-full);
  background: linear-gradient(135deg, #0284C7, #38BDF8);
  color: #0B0F17;
  border: none;
  cursor: pointer;
  box-shadow: 0 10px 25px rgba(56, 189, 248, 0.35);
  transition: all var(--transition-fast);
}
.mic-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 14px 30px rgba(56, 189, 248, 0.5);
}
.mic-btn:active {
  transform: translateY(0);
}
.mic-btn.listening {
  background: linear-gradient(135deg, #00C853, #00E676);
  color: #0B0F17;
  box-shadow: 0 10px 25px var(--color-in-tune-glow);
  animation: pulse-ring 2s infinite;
}
@keyframes pulse-ring {
  0% { box-shadow: 0 0 0 0 rgba(0, 230, 118, 0.6); }
  70% { box-shadow: 0 0 0 18px rgba(0, 230, 118, 0); }
  100% { box-shadow: 0 0 0 0 rgba(0, 230, 118, 0); }
}

/* Headstock & Tactile String Buttons */
.headstock-strings-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.25rem;
  margin: 1rem 0;
  width: 100%;
}

.headstock-svg-wrap {
  width: 100%;
  max-width: 320px;
  display: flex;
  justify-content: center;
}
.headstock-wireframe {
  width: 100%;
  height: auto;
  filter: drop-shadow(0 8px 16px rgba(0,0,0,0.4));
}
.tuning-peg {
  cursor: pointer;
  transition: all var(--transition-fast);
}
.tuning-peg:hover circle {
  fill: var(--color-accent);
}
.tuning-peg.active circle {
  fill: var(--color-in-tune);
  filter: drop-shadow(0 0 8px var(--color-in-tune));
}

/* Left-Handed Mode */
.left-handed .headstock-svg-wrap,
.left-handed .fretboard-wrap {
  transform: scaleX(-1);
}

/* Horizontal Tactile String Buttons Row */
.string-buttons-row {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.65rem;
  width: 100%;
}
.string-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-width: 65px;
  height: 68px;
  padding: 0.35rem 0.5rem;
  border-radius: var(--radius-md);
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
  cursor: pointer;
  transition: all var(--transition-fast);
  position: relative;
}
.string-btn:hover {
  border-color: var(--color-accent);
  background: var(--card-surface-hover);
  transform: translateY(-2px);
}
.string-btn.active {
  border-color: var(--color-accent);
  background: rgba(56, 189, 248, 0.15);
  box-shadow: 0 0 15px rgba(56, 189, 248, 0.25);
}
.string-btn.in-tune {
  border-color: var(--color-in-tune);
  background: rgba(0, 230, 118, 0.15);
}
.string-btn .s-note {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 700;
  line-height: 1.1;
}
.string-btn .s-hz {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-muted);
}
.string-btn .play-icon {
  font-size: 0.75rem;
  color: var(--color-accent);
  margin-top: 2px;
}

/* Settings Bar */
.settings-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 0.85rem 1.25rem;
  margin-top: 1.5rem;
}
.setting-item {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-secondary);
}
.setting-item label {
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.45rem;
}
.toggle-switch {
  position: relative;
  display: inline-block;
  width: 40px;
  height: 22px;
}
.toggle-switch input {
  opacity: 0;
  width: 0;
  height: 0;
}
.slider-toggle {
  position: absolute;
  cursor: pointer;
  top: 0; left: 0; right: 0; bottom: 0;
  background-color: var(--border-subtle);
  transition: .3s;
  border-radius: 34px;
}
.slider-toggle:before {
  position: absolute;
  content: "";
  height: 16px;
  width: 16px;
  left: 3px;
  bottom: 3px;
  background-color: white;
  transition: .3s;
  border-radius: 50%;
}
input:checked + .slider-toggle {
  background-color: var(--color-in-tune);
}
input:checked + .slider-toggle:before {
  transform: translateX(18px);
}

.a4-selector {
  display: flex;
  align-items: center;
  gap: 0.35rem;
}
.a4-btn {
  padding: 0.2rem 0.5rem;
  font-size: 0.75rem;
  font-weight: 700;
  border-radius: var(--radius-sm);
  background: var(--card-surface);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  cursor: pointer;
}
.a4-btn.active {
  background: var(--color-accent);
  color: #0B0F17;
  border-color: var(--color-accent);
}
.a4-input {
  width: 55px;
  padding: 0.2rem 0.35rem;
  border-radius: var(--radius-sm);
  background: var(--card-surface);
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  text-align: center;
}

/* Trust Checkmark Strip */
.trust-strip {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 1.5rem;
  padding: 0.85rem 0 1.5rem;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
}
.trust-strip span {
  display: flex;
  align-items: center;
  gap: 0.35rem;
}
.trust-strip .check {
  color: var(--color-in-tune);
}

/* Shortcuts Grid */
.shortcuts-section {
  margin: 1.5rem 0 2.5rem;
}
.section-heading-sm {
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 1rem;
  color: var(--text-primary);
}
.shortcuts-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.85rem;
}
@media (min-width: 768px) {
  .shortcuts-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}
.shortcut-card {
  display: flex;
  flex-direction: column;
  padding: 1rem 1.25rem;
  background: var(--card-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  transition: all var(--transition-fast);
}
.shortcut-card:hover {
  border-color: var(--color-accent);
  transform: translateY(-2px);
  text-decoration: none;
  box-shadow: 0 8px 20px rgba(0,0,0,0.3);
}
.shortcut-card .sc-title {
  font-weight: 700;
  font-size: 1.05rem;
  margin-bottom: 0.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.shortcut-card .sc-notes {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--color-accent);
  margin-bottom: 0.35rem;
}
.shortcut-card .sc-desc {
  font-size: 0.82rem;
  color: var(--text-secondary);
  line-height: 1.4;
}

/* ========================================================
   Content Sections Below The Fold
   ======================================================== */
.seo-content-section {
  padding: 2.5rem 0;
  border-top: 1px solid var(--border-subtle);
}
.content-block {
  margin-bottom: 2.5rem;
}
.content-block h2 {
  font-family: var(--font-display);
  font-size: 1.85rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
  color: var(--text-primary);
}
.content-block h3 {
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 700;
  margin: 1.25rem 0 0.5rem;
  color: var(--text-primary);
}
.content-block p {
  color: var(--text-secondary);
  margin-bottom: 0.85rem;
}

/* Frequency Chart Table */
.table-responsive {
  width: 100%;
  overflow-x: auto;
  margin: 1.25rem 0;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
}
.styled-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  background: var(--card-surface);
}
.styled-table th, .styled-table td {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border-subtle);
  font-size: 0.9rem;
}
.styled-table th {
  background: var(--bg-secondary);
  font-family: var(--font-display);
  font-weight: 700;
  color: var(--text-primary);
}
.styled-table td.mono {
  font-family: var(--font-mono);
  color: var(--color-accent);
}

/* FAQ Accordion */
.faq-accordion {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-top: 1.25rem;
}
.faq-item {
  background: var(--card-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color var(--transition-fast);
}
.faq-item:hover {
  border-color: rgba(56, 189, 248, 0.4);
}
.faq-question {
  width: 100%;
  text-align: left;
  background: transparent;
  border: none;
  padding: 1rem 1.25rem;
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-primary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}
.faq-icon {
  font-size: 1.25rem;
  color: var(--color-accent);
  transition: transform var(--transition-fast);
}
.faq-item.open .faq-icon {
  transform: rotate(45deg);
}
.faq-answer {
  display: none;
  padding: 0 1.25rem 1.25rem;
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.6;
}
.faq-item.open .faq-answer {
  display: block;
}

/* ========================================================
   Monetization / Ad Slots
   ======================================================== */
.monetization-slot {
  margin: 2rem 0;
  text-align: center;
}
.ad-placeholder {
  background: rgba(255, 255, 255, 0.02);
  border: 1px dashed var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.5rem;
}
.affiliate-card {
  background: var(--card-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}
.btn-accent {
  background: var(--color-accent);
  color: #0B0F17;
  padding: 0.5rem 1rem;
  border-radius: var(--radius-sm);
  font-weight: 700;
  font-size: 0.85rem;
  border: none;
  cursor: pointer;
  white-space: nowrap;
}
.btn-accent:hover {
  background: #7dd3fc;
  text-decoration: none;
}

/* ========================================================
   Footer
   ======================================================== */
.site-footer {
  margin-top: auto;
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-subtle);
  padding: 2.5rem 0 1.5rem;
  color: var(--text-secondary);
  font-size: 0.9rem;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 2rem;
  margin-bottom: 2rem;
}
@media (max-width: 768px) {
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
}
.footer-heading {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.85rem;
}
.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.footer-links a {
  color: var(--text-secondary);
  font-size: 0.88rem;
}
.footer-links a:hover {
  color: var(--color-accent);
}
.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border-subtle);
  font-size: 0.82rem;
  color: var(--text-muted);
}

/* Responsive adjustments */
@media (max-width: 640px) {
  .hero-title {
    font-size: 1.75rem;
  }
  .target-note-name {
    font-size: 3.5rem;
  }
  .header-actions .pwa-btn span {
    display: none;
  }
}

/* ========================================================
   Mobile Navigation Drawer & Toggle
   ======================================================== */
.mobile-only-btn {
  display: none;
}
@media (max-width: 840px) {
  .desktop-nav {
    display: none !important;
  }
  .mobile-only-btn {
    display: inline-flex !important;
  }
}
.mobile-drawer {
  display: none;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-subtle);
  padding: 0.85rem 1rem 1.25rem;
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.5);
}
.mobile-drawer.open {
  display: block;
  animation: drawerSlideDown 0.22s cubic-bezier(0.16, 1, 0.3, 1);
}
@keyframes drawerSlideDown {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 1; transform: translateY(0); }
}
.mobile-drawer-links {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  max-width: 600px;
  margin: 0 auto;
}
.mobile-nav-link {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1rem;
  border-radius: var(--radius-sm);
  background: var(--card-surface);
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  min-height: 46px;
  transition: all var(--transition-fast);
}
.mobile-nav-link:hover, .mobile-nav-link.active {
  background: rgba(56, 189, 248, 0.15);
  border-color: var(--color-accent);
  color: var(--color-accent);
  text-decoration: none;
}

/* ========================================================
   Realistic Interactive Guitar Headstock & Strings
   ======================================================== */
.real-guitar-wrap {
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  margin: 1rem 0;
  position: relative;
}
.guitar-stage {
  width: 100%;
  max-width: 380px;
  display: flex;
  justify-content: center;
  position: relative;
}
.real-guitar-svg {
  width: 100%;
  height: auto;
  filter: drop-shadow(0 14px 28px rgba(0, 0, 0, 0.65));
  user-select: none;
  touch-action: manipulation;
  transition: transform var(--transition-fast);
}
.left-handed .real-guitar-svg {
  transform: scaleX(-1);
}

/* Tuning Peg Groups */
.tuning-peg-group {
  cursor: pointer;
  outline: none;
  transition: transform 0.2s cubic-bezier(0.34, 1.56, 0.64, 1);
  transform-origin: center;
}
.tuning-peg-group:hover, .tuning-peg-group:focus-visible {
  filter: drop-shadow(0 0 8px rgba(56, 189, 248, 0.8));
}
.tuning-peg-group:active {
  transform: scale(0.96);
}
.tuning-peg-group .peg-knob {
  transition: stroke 0.2s ease, filter 0.2s ease;
}
.tuning-peg-group.active .peg-knob {
  stroke: var(--color-accent);
  stroke-width: 2.5px;
  filter: drop-shadow(0 0 10px rgba(56, 189, 248, 0.9));
}
.tuning-peg-group.active .peg-text {
  fill: #0284C7;
  font-weight: 800;
}
.tuning-peg-group.in-tune .peg-knob {
  stroke: var(--color-in-tune);
  stroke-width: 3px;
  filter: drop-shadow(0 0 12px var(--color-in-tune));
}
.tuning-peg-group.in-tune .peg-text {
  fill: #00E676;
  font-weight: 800;
}

/* Real Vibrating Guitar Strings */
.guitar-string-line {
  transition: stroke 0.2s ease, stroke-width 0.2s ease;
}
.guitar-string-line.vibrating {
  animation: string-vibrate 0.12s infinite alternate ease-in-out;
  stroke-width: 4.5px !important;
  filter: drop-shadow(0 0 6px rgba(255, 255, 255, 0.75));
}
@keyframes string-vibrate {
  0% { transform: translateX(-1.5px); }
  100% { transform: translateX(1.5px); }
}

/* ========================================================
   Oscilloscope Neon Waveform Canvas & Audio Controls
   ======================================================== */
.scope-box {
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0.5rem auto 1rem;
  width: 100%;
  max-width: 380px;
  background: rgba(11, 15, 23, 0.65);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 0.35rem 0.5rem;
  position: relative;
  overflow: hidden;
}
.scope-box canvas {
  width: 100%;
  height: 38px;
  display: block;
}

.tuner-audio-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin: 0.75rem 0 1.25rem;
  padding: 0.65rem 1.15rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  font-size: 0.85rem;
}
.tone-mode-selector {
  display: flex;
  align-items: center;
  gap: 0.35rem;
}
.tone-pill {
  padding: 0.35rem 0.75rem;
  border-radius: var(--radius-full);
  background: var(--card-surface);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
}
.tone-pill:hover {
  border-color: var(--color-accent);
  color: var(--text-primary);
}
.tone-pill.active {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: #0B0F17;
}
.volume-control {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-secondary);
  font-weight: 600;
}
.vol-slider {
  width: 80px;
  accent-color: var(--color-accent);
  cursor: pointer;
}

/* ========================================================
   Practice Hub & High-Retention Feature Cards
   ======================================================== */
.practice-hub-section {
  margin: 2.25rem 0;
}
.hub-title {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 1rem;
  letter-spacing: -0.02em;
}
.practice-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1rem;
}
.practice-card {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  background: var(--card-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  text-decoration: none;
  transition: all var(--transition-fast);
}
.practice-card:hover {
  border-color: var(--color-accent);
  transform: translateY(-3px);
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.35);
  text-decoration: none;
}
.practice-icon {
  font-size: 2rem;
  line-height: 1;
  flex-shrink: 0;
}
.practice-info h3 {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.25rem;
}
.practice-info p {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.4;
  margin: 0;
}

/* Popular Tunings Quick Strip */
.popular-tunings-section {
  margin: 2.25rem 0;
}
.tuning-pills-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  margin-top: 0.75rem;
}
.tuning-pill {
  display: inline-flex;
  align-items: center;
  padding: 0.5rem 0.95rem;
  border-radius: var(--radius-full);
  background: var(--card-surface);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  font-size: 0.85rem;
  font-weight: 600;
  text-decoration: none;
  transition: all var(--transition-fast);
  min-height: 38px;
}
.tuning-pill:hover, .tuning-pill.active {
  background: rgba(56, 189, 248, 0.12);
  border-color: var(--color-accent);
  color: var(--color-accent);
  text-decoration: none;
  transform: translateY(-1px);
}

/* 3-Step Quick Guide */
.steps-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
  margin-top: 1rem;
}
@media (max-width: 768px) {
  .steps-grid {
    grid-template-columns: 1fr;
    gap: 1rem;
  }
}
.step-item {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  position: relative;
}
.step-num {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--color-accent);
  color: #0B0F17;
  font-family: var(--font-display);
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 0.75rem;
}
.step-item h4 {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.35rem;
}
.step-item p {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.5;
  margin: 0;
}

/* Touch Friendly Targets & Responsive Safeguards */
html, body {
  overflow-x: hidden;
  max-width: 100vw;
}
@media (max-width: 580px) {
  .tuner-card {
    padding: 1.25rem 0.85rem;
    border-radius: var(--radius-md);
  }
  .instrument-bar {
    gap: 0.4rem;
  }
  .instrument-card {
    padding: 0.45rem 0.75rem;
    font-size: 0.82rem;
  }
  .string-btn {
    min-width: 52px;
    height: 60px;
    padding: 0.25rem 0.35rem;
  }
  .string-btn .s-note {
    font-size: 1.1rem;
  }
  .string-btn .s-hz {
    font-size: 0.65rem;
  }
  .settings-bar {
    justify-content: center;
    gap: 0.75rem;
    padding: 0.75rem 0.85rem;
  }
  .guitar-stage {
    max-width: 300px;
  }
}