/* ===================================================================
   VYNORA — NATIVE ANDROID MUSIC PLAYER & AUDIUS STREAMING ENGINE
   Official Project Website Stylesheet
   Modern Dark Aesthetic · Pure CSS3 · Fully Responsive
   =================================================================== */

:root {
  --bg-primary: #07090E;
  --bg-secondary: #0D111A;
  --bg-tertiary: #141B29;
  --bg-glass: rgba(13, 17, 26, 0.75);
  --bg-glass-card: rgba(20, 27, 41, 0.65);
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-highlight: rgba(29, 185, 84, 0.35);

  --accent-green: #1DB954;
  --accent-green-bright: #1ED760;
  --accent-green-glow: rgba(30, 215, 96, 0.35);
  
  --accent-audius: #CC3399;
  --accent-audius-glow: rgba(204, 51, 153, 0.35);

  --accent-amber: #F59E0B;
  --accent-amber-glow: rgba(245, 158, 11, 0.35);

  --text-primary: #FFFFFF;
  --text-secondary: #94A3B8;
  --text-muted: #64748B;

  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', Menlo, Consolas, monospace;

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --radius-xl: 32px;
  --radius-pill: 9999px;

  --transition-fast: 0.15s ease;
  --transition-smooth: 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-slow: 0.5s cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  overflow-x: hidden;
  line-height: 1.6;
  background-image: 
    radial-gradient(ellipse 80% 50% at 50% -20%, rgba(29, 185, 84, 0.15), transparent),
    radial-gradient(ellipse 60% 40% at 90% 40%, rgba(204, 51, 153, 0.08), transparent),
    radial-gradient(ellipse 50% 30% at 10% 70%, rgba(245, 158, 11, 0.08), transparent);
  background-repeat: no-repeat;
  min-height: 100vh;
}

/* ==================== TYPOGRAPHY & LINKS ==================== */
h1, h2, h3, h4, h5, h6 {
  color: var(--text-primary);
  font-weight: 800;
  line-height: 1.2;
}

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

a:hover {
  color: #FFFFFF;
}

.gradient-text {
  background: linear-gradient(135deg, #FFFFFF 20%, #1ED760 70%, #A7F3D0 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.gradient-text-audius {
  background: linear-gradient(135deg, #FFFFFF 20%, #CC3399 70%, #F472B6 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.gradient-text-amber {
  background: linear-gradient(135deg, #FFFFFF 20%, #F59E0B 70%, #FDE68A 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* ==================== CONTAINER & LAYOUT ==================== */
.container {
  width: 100%;
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 24px;
}

section {
  padding: 90px 0;
  position: relative;
}

/* ==================== STICKY NAVBAR ==================== */
.navbar {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--bg-glass);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--border-subtle);
  transition: background-color var(--transition-smooth);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.nav-logo {
  width: 38px;
  height: 38px;
  border-radius: var(--radius-sm);
  box-shadow: 0 0 16px var(--accent-green-glow);
  transition: transform var(--transition-fast);
}

.nav-brand:hover .nav-logo {
  transform: scale(1.06);
}

.nav-brand-title {
  font-size: 1.35rem;
  font-weight: 900;
  letter-spacing: -0.5px;
  color: #FFFFFF;
}

.nav-version {
  font-size: 0.72rem;
  font-weight: 700;
  background: rgba(30, 215, 96, 0.15);
  color: var(--accent-green-bright);
  padding: 3px 8px;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(30, 215, 96, 0.3);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}

.nav-link {
  color: var(--text-secondary);
  font-size: 0.95rem;
  font-weight: 600;
  transition: color var(--transition-fast);
}

.nav-link:hover {
  color: #FFFFFF;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

.nav-mobile-toggle {
  display: none;
  background: none;
  border: none;
  color: #FFFFFF;
  font-size: 1.6rem;
  cursor: pointer;
}

/* ==================== BUTTONS ==================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 12px 26px;
  border-radius: var(--radius-pill);
  font-size: 0.95rem;
  font-weight: 700;
  cursor: pointer;
  transition: all var(--transition-smooth);
  border: 1px solid transparent;
  text-decoration: none;
  line-height: 1;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent-green), var(--accent-green-bright));
  color: #07090E;
  box-shadow: 0 4px 20px var(--accent-green-glow);
}

.btn-primary:hover {
  color: #07090E;
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(30, 215, 96, 0.55);
}

.btn-secondary {
  background: var(--bg-tertiary);
  color: #FFFFFF;
  border-color: var(--border-subtle);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.2);
  color: #FFFFFF;
  transform: translateY(-2px);
}

.btn-sm {
  padding: 8px 18px;
  font-size: 0.85rem;
}

.btn-lg {
  padding: 16px 36px;
  font-size: 1.05rem;
}

/* ==================== HERO SECTION ==================== */
.hero {
  padding: 80px 0 100px;
  text-align: center;
  position: relative;
}

.hero-pill {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 6px 18px;
  background: rgba(30, 215, 96, 0.1);
  border: 1px solid rgba(30, 215, 96, 0.25);
  border-radius: var(--radius-pill);
  color: var(--accent-green-bright);
  font-size: 0.85rem;
  font-weight: 700;
  margin-bottom: 28px;
  box-shadow: 0 0 20px rgba(30, 215, 96, 0.1);
}

.hero-pill-badge {
  background: var(--accent-green);
  color: #07090E;
  padding: 2px 8px;
  border-radius: var(--radius-pill);
  font-size: 0.75rem;
  font-weight: 900;
}

.hero-title {
  font-size: 4rem;
  font-weight: 900;
  letter-spacing: -1.5px;
  max-width: 960px;
  margin: 0 auto 24px;
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--text-secondary);
  max-width: 760px;
  margin: 0 auto 40px;
  font-weight: 400;
}

.hero-buttons {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 18px;
  margin-bottom: 50px;
  flex-wrap: wrap;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  max-width: 880px;
  margin: 0 auto 60px;
  padding: 24px 30px;
  background: var(--bg-glass);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(12px);
}

.stat-item {
  text-align: center;
}

.stat-value {
  font-size: 1.8rem;
  font-weight: 900;
  color: #FFFFFF;
}

.stat-label {
  font-size: 0.8rem;
  color: var(--text-secondary);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  margin-top: 4px;
}

/* ==================== HERO VISUAL / MOCKUP ==================== */
.hero-visual {
  position: relative;
  max-width: 1040px;
  margin: 0 auto;
}

.hero-visual-card {
  border-radius: var(--radius-xl);
  overflow: hidden;
  border: 1px solid var(--border-subtle);
  box-shadow: 0 30px 80px rgba(0, 0, 0, 0.7), 0 0 40px rgba(30, 215, 96, 0.15);
  background: #0B0E17;
}

.hero-visual-card img {
  width: 100%;
  height: auto;
  display: block;
}

/* ==================== INTERACTIVE VISUALIZER SECTION ==================== */
.visualizer-section {
  background: linear-gradient(180deg, var(--bg-primary) 0%, var(--bg-secondary) 50%, var(--bg-primary) 100%);
  border-top: 1px solid var(--border-subtle);
  border-bottom: 1px solid var(--border-subtle);
}

.section-header {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 50px;
}

.section-tag {
  color: var(--accent-green-bright);
  font-size: 0.85rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  margin-bottom: 12px;
  display: block;
}

.section-title {
  font-size: 2.6rem;
  margin-bottom: 16px;
  letter-spacing: -0.8px;
}

.section-subtitle {
  color: var(--text-secondary);
  font-size: 1.1rem;
}

.visualizer-card {
  background: var(--bg-glass-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: 36px;
  backdrop-filter: blur(16px);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
}

.visualizer-canvas-container {
  position: relative;
  width: 100%;
  height: 240px;
  background: #06090F;
  border-radius: var(--radius-lg);
  border: 1px solid rgba(255, 255, 255, 0.06);
  overflow: hidden;
  margin-bottom: 28px;
}

#visualizerCanvas {
  width: 100%;
  height: 100%;
  display: block;
}

.visualizer-overlay-info {
  position: absolute;
  top: 16px;
  left: 20px;
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--accent-amber);
  background: rgba(15, 23, 42, 0.8);
  padding: 6px 14px;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(245, 158, 11, 0.3);
}

.visualizer-pulse-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent-amber);
  animation: pulseDot 1.4s infinite;
}

@keyframes pulseDot {
  0% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.6); opacity: 0.4; }
  100% { transform: scale(1); opacity: 1; }
}

.visualizer-controls {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 20px;
  border-top: 1px solid var(--border-subtle);
  padding-top: 24px;
}

.vis-audio-btn-group {
  display: flex;
  align-items: center;
  gap: 14px;
}

.vis-theme-group {
  display: flex;
  align-items: center;
  gap: 8px;
}

.theme-pill {
  padding: 6px 16px;
  border-radius: var(--radius-pill);
  font-size: 0.85rem;
  font-weight: 700;
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  border: 1px solid var(--border-subtle);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.theme-pill:hover, .theme-pill.active {
  color: #FFFFFF;
}

.theme-pill.active[data-theme="amber"] {
  background: rgba(245, 158, 11, 0.2);
  border-color: var(--accent-amber);
  color: var(--accent-amber);
}

.theme-pill.active[data-theme="emerald"] {
  background: rgba(30, 215, 96, 0.2);
  border-color: var(--accent-green-bright);
  color: var(--accent-green-bright);
}

.theme-pill.active[data-theme="audius"] {
  background: rgba(204, 51, 153, 0.2);
  border-color: var(--accent-audius);
  color: var(--accent-audius);
}

/* ==================== SCREENSHOT GALLERY SHOWCASE ==================== */
.showcase-section {
  position: relative;
}

.showcase-tabs {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-bottom: 40px;
  flex-wrap: wrap;
}

.showcase-tab {
  padding: 10px 22px;
  border-radius: var(--radius-pill);
  background: var(--bg-glass-card);
  color: var(--text-secondary);
  border: 1px solid var(--border-subtle);
  font-size: 0.9rem;
  font-weight: 700;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.showcase-tab:hover, .showcase-tab.active {
  background: var(--accent-green);
  color: #07090E;
  border-color: var(--accent-green);
  box-shadow: 0 4px 16px var(--accent-green-glow);
}

.showcase-display {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: center;
  background: var(--bg-glass-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: 40px;
}

.phone-mockup {
  position: relative;
  max-width: 380px;
  margin: 0 auto;
  border-radius: 42px;
  padding: 12px;
  background: #1E293B;
  box-shadow: 0 25px 60px rgba(0, 0, 0, 0.8), 0 0 30px rgba(30, 215, 96, 0.15);
  border: 2px solid rgba(255, 255, 255, 0.12);
}

.phone-screen {
  border-radius: 32px;
  overflow: hidden;
  background: #000000;
  aspect-ratio: 9 / 19.5;
}

.phone-screen img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: opacity var(--transition-smooth);
}

.showcase-details {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.showcase-badge {
  display: inline-block;
  padding: 4px 12px;
  border-radius: var(--radius-pill);
  background: rgba(30, 215, 96, 0.15);
  color: var(--accent-green-bright);
  font-size: 0.8rem;
  font-weight: 800;
  letter-spacing: 0.5px;
  width: fit-content;
}

.showcase-heading {
  font-size: 2.2rem;
  letter-spacing: -0.5px;
}

.showcase-desc {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

.showcase-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.showcase-list li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  font-size: 0.95rem;
  color: #CBD5E1;
}

.showcase-list li svg {
  color: var(--accent-green-bright);
  flex-shrink: 0;
  margin-top: 4px;
}

/* ==================== FEATURES GRID ==================== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.feature-card {
  background: var(--bg-glass-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 32px;
  transition: all var(--transition-smooth);
  position: relative;
  overflow: hidden;
}

.feature-card:hover {
  transform: translateY(-5px);
  border-color: var(--border-highlight);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.4), 0 0 25px rgba(30, 215, 96, 0.15);
}

.feature-icon-wrapper {
  width: 54px;
  height: 54px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 22px;
  font-size: 1.6rem;
}

.feature-icon-green {
  background: rgba(30, 215, 96, 0.15);
  color: var(--accent-green-bright);
  border: 1px solid rgba(30, 215, 96, 0.3);
}

.feature-icon-amber {
  background: rgba(245, 158, 11, 0.15);
  color: var(--accent-amber);
  border: 1px solid rgba(245, 158, 11, 0.3);
}

.feature-icon-audius {
  background: rgba(204, 51, 153, 0.15);
  color: var(--accent-audius);
  border: 1px solid rgba(204, 51, 153, 0.3);
}

.feature-title {
  font-size: 1.3rem;
  margin-bottom: 12px;
}

.feature-desc {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ==================== ARCHITECTURE & FLOW ==================== */
.arch-card {
  background: var(--bg-glass-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: 40px;
  backdrop-filter: blur(16px);
}

.arch-img-wrapper {
  margin-bottom: 30px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.arch-img-wrapper img {
  width: 100%;
  display: block;
}

/* ==================== TECH SPECS TABLE ==================== */
.specs-table-wrapper {
  overflow-x: auto;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-subtle);
  background: var(--bg-glass-card);
}

.specs-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.95rem;
}

.specs-table th {
  background: rgba(255, 255, 255, 0.04);
  padding: 18px 24px;
  color: #FFFFFF;
  font-weight: 800;
  border-bottom: 1px solid var(--border-subtle);
}

.specs-table td {
  padding: 16px 24px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
  color: var(--text-secondary);
}

.specs-table tr:hover td {
  background: rgba(255, 255, 255, 0.02);
  color: #FFFFFF;
}

.specs-table td strong {
  color: #FFFFFF;
}

.badge-tag {
  display: inline-block;
  padding: 3px 8px;
  border-radius: 6px;
  background: rgba(30, 215, 96, 0.15);
  color: var(--accent-green-bright);
  font-size: 0.8rem;
  font-weight: 700;
}

/* ==================== 1-CLICK DOWNLOAD SECTION ==================== */
.download-section {
  background: linear-gradient(180deg, var(--bg-primary) 0%, #0A1610 50%, var(--bg-primary) 100%);
  border-top: 1px solid var(--border-subtle);
}

.download-box {
  background: radial-gradient(circle at 50% 0%, rgba(30, 215, 96, 0.12), transparent 70%), var(--bg-glass-card);
  border: 1px solid var(--border-highlight);
  border-radius: var(--radius-xl);
  padding: 60px 40px;
  text-align: center;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.6), 0 0 40px rgba(30, 215, 96, 0.2);
}

.download-box-title {
  font-size: 2.8rem;
  margin-bottom: 16px;
}

.download-box-subtitle {
  color: var(--text-secondary);
  font-size: 1.15rem;
  max-width: 650px;
  margin: 0 auto 36px;
}

.download-ctas {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 20px;
  margin-bottom: 36px;
  flex-wrap: wrap;
}

.checksum-container {
  max-width: 760px;
  margin: 0 auto 40px;
  background: #06090F;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.checksum-code {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--accent-green-bright);
  word-break: break-all;
  text-align: left;
}

.copy-btn {
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  border: 1px solid var(--border-subtle);
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  font-weight: 700;
  cursor: pointer;
  white-space: nowrap;
  transition: all var(--transition-fast);
}

.copy-btn:hover {
  background: #FFFFFF;
  color: #07090E;
}

.install-steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  max-width: 900px;
  margin: 0 auto;
  text-align: left;
}

.install-step {
  background: rgba(255, 255, 255, 0.03);
  border-radius: var(--radius-md);
  padding: 20px;
  border: 1px solid rgba(255, 255, 255, 0.05);
}

.install-step-num {
  font-size: 1.4rem;
  font-weight: 900;
  color: var(--accent-green-bright);
  margin-bottom: 8px;
}

.install-step-title {
  font-size: 1.05rem;
  color: #FFFFFF;
  margin-bottom: 6px;
}

.install-step-desc {
  font-size: 0.88rem;
  color: var(--text-secondary);
}

/* ==================== FOOTER ==================== */
.footer {
  border-top: 1px solid var(--border-subtle);
  padding: 60px 0 30px;
  background: #05070B;
}

.footer-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 50px;
  flex-wrap: wrap;
  gap: 40px;
}

.footer-brand {
  max-width: 360px;
}

.footer-brand-title {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.3rem;
  font-weight: 900;
  margin-bottom: 14px;
}

.footer-brand-desc {
  color: var(--text-muted);
  font-size: 0.92rem;
  line-height: 1.6;
}

.footer-nav {
  display: flex;
  gap: 60px;
  flex-wrap: wrap;
}

.footer-col h4 {
  font-size: 0.95rem;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  margin-bottom: 16px;
  color: #FFFFFF;
}

.footer-col ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-col a {
  color: var(--text-muted);
  font-size: 0.9rem;
  transition: color var(--transition-fast);
}

.footer-col a:hover {
  color: var(--accent-green-bright);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  padding-top: 30px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: var(--text-muted);
  font-size: 0.85rem;
  flex-wrap: wrap;
  gap: 16px;
}

/* ==================== TOAST NOTIFICATION ==================== */
.toast {
  position: fixed;
  bottom: 30px;
  right: 30px;
  background: #10261B;
  color: var(--accent-green-bright);
  border: 1px solid var(--accent-green);
  padding: 12px 24px;
  border-radius: var(--radius-pill);
  font-weight: 700;
  font-size: 0.9rem;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.6);
  opacity: 0;
  transform: translateY(20px);
  pointer-events: none;
  transition: all var(--transition-smooth);
  z-index: 9999;
}

.toast.show {
  opacity: 1;
  transform: translateY(0);
}

/* ==================== RESPONSIVE MEDIA QUERIES ==================== */
@media (max-width: 1024px) {
  .hero-title {
    font-size: 3.2rem;
  }
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .showcase-display {
    grid-template-columns: 1fr;
    text-align: center;
  }
  .showcase-details {
    align-items: center;
  }
  .showcase-badge {
    margin: 0 auto;
  }
  .showcase-list li {
    text-align: left;
  }
  .hero-stats {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 76px;
    left: 0;
    width: 100%;
    background: var(--bg-secondary);
    flex-direction: column;
    padding: 24px;
    border-bottom: 1px solid var(--border-subtle);
    gap: 18px;
  }
  .nav-links.active {
    display: flex;
  }
  .nav-mobile-toggle {
    display: block;
  }
  .hero-title {
    font-size: 2.4rem;
  }
  .hero-subtitle {
    font-size: 1.05rem;
  }
  .features-grid {
    grid-template-columns: 1fr;
  }
  .install-steps {
    grid-template-columns: 1fr;
  }
  .visualizer-controls {
    flex-direction: column;
    align-items: stretch;
  }
  .vis-audio-btn-group, .vis-theme-group {
    justify-content: center;
  }
  .footer-nav {
    gap: 30px;
  }
}

/* ==================== HERO REAL DEVICE TRIO ==================== */
.hero-phones-container {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 24px;
  position: relative;
  max-width: 1060px;
  margin: 0 auto;
}

.hero-phone-side {
  width: 260px;
  border-radius: 36px;
  overflow: hidden;
  border: 2px solid rgba(255, 255, 255, 0.12);
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.7);
  transition: transform var(--transition-smooth), opacity var(--transition-smooth);
  opacity: 0.85;
}

.hero-phone-side:hover {
  opacity: 1;
  transform: translateY(-8px) scale(1.02);
}

.hero-phone-side img {
  width: 100%;
  height: auto;
  display: block;
}

.hero-phone-center {
  width: 320px;
  border-radius: 42px;
  overflow: hidden;
  border: 2px solid var(--accent-amber);
  box-shadow: 0 30px 80px rgba(0, 0, 0, 0.9), 0 0 50px rgba(245, 158, 11, 0.35);
  transform: scale(1.06);
  z-index: 2;
  transition: transform var(--transition-smooth), box-shadow var(--transition-smooth);
}

.hero-phone-center:hover {
  transform: scale(1.09) translateY(-6px);
  box-shadow: 0 35px 90px rgba(0, 0, 0, 0.95), 0 0 60px rgba(245, 158, 11, 0.5);
}

.hero-phone-center img {
  width: 100%;
  height: auto;
  display: block;
}

@media (max-width: 860px) {
  .hero-phone-side {
    display: none;
  }
  .hero-phone-center {
    width: 290px;
    transform: none;
  }
}

/* ==================== ARCHITECTURE STACK CARDS ==================== */
.arch-layers-stack {
  display: flex;
  flex-direction: column;
  gap: 16px;
  max-width: 960px;
  margin: 0 auto;
}

.arch-layer-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 24px 30px;
  transition: transform var(--transition-fast), border-color var(--transition-fast);
}

.arch-layer-card:hover {
  border-color: var(--accent-green);
  transform: translateX(4px);
}

.arch-layer-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
  flex-wrap: wrap;
  gap: 10px;
}

.arch-layer-title {
  font-size: 1.15rem;
  font-weight: 800;
  color: #FFFFFF;
  display: flex;
  align-items: center;
  gap: 10px;
}

.arch-layer-badge {
  font-size: 0.78rem;
  padding: 3px 10px;
  border-radius: var(--radius-pill);
  font-weight: 700;
}

.arch-layer-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.arch-chip {
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  border: 1px solid rgba(255, 255, 255, 0.05);
  padding: 4px 12px;
  border-radius: var(--radius-pill);
  font-size: 0.82rem;
  font-family: var(--font-mono);
}

/* ==================== CONTRIBUTOR ROADMAP GRID ==================== */
.roadmap-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  margin-top: 40px;
}

.roadmap-card {
  background: var(--bg-glass-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: all var(--transition-smooth);
}

.roadmap-card:hover {
  border-color: var(--accent-green-bright);
  transform: translateY(-4px);
  box-shadow: 0 16px 36px rgba(0, 0, 0, 0.4);
}

.roadmap-badge {
  display: inline-block;
  padding: 3px 10px;
  border-radius: var(--radius-pill);
  font-size: 0.75rem;
  font-weight: 800;
  text-transform: uppercase;
  margin-bottom: 12px;
}

.roadmap-title {
  font-size: 1.25rem;
  margin-bottom: 10px;
}

.roadmap-desc {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 14px;
}

.roadmap-points {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.roadmap-points li {
  font-size: 0.86rem;
  color: #CBD5E1;
  display: flex;
  align-items: flex-start;
  gap: 8px;
}

.roadmap-points li::before {
  content: "→";
  color: var(--accent-green-bright);
  font-weight: 900;
}

@media (max-width: 768px) {
  .roadmap-grid {
    grid-template-columns: 1fr;
  }
}