:root {
  --bg: #fafafa;
  --surface: rgba(255, 255, 255, 0.65);
  --surface-solid: #ffffff;
  --text: #111111;
  --text-secondary: #555555;
  --violet: #8b5cf6;
  --violet-soft: rgba(139, 92, 246, 0.12);
  --violet-glow: rgba(139, 92, 246, 0.25);
  --border: rgba(0, 0, 0, 0.06);
  --shadow: 0 8px 32px rgba(0, 0, 0, 0.04);
  --radius: 16px;
  --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

html {
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background-color: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* Skip link */
.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--text);
  color: var(--bg);
  padding: 8px 16px;
  z-index: 100;
  transition: top 0.2s;
}
.skip-link:focus { top: 0; }

/* Utilities */
.container {
  width: 92%;
  max-width: 1200px;
  margin-inline: auto;
}

.glass-panel {
  background: var(--surface);
  backdrop-filter: blur(16px) saturate(140%);
  -webkit-backdrop-filter: blur(16px) saturate(140%);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.glass-card {
  background: var(--surface-solid);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  transition: transform var(--transition), box-shadow var(--transition);
  position: relative;
  overflow: hidden;
}
.glass-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(139, 92, 246, 0.06) 0%, transparent 60%);
  opacity: 0;
  transition: opacity var(--transition);
  pointer-events: none;
}
.glass-card:hover::before { opacity: 1; }
.glass-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 20px 40px rgba(0,0,0,0.06);
}

.section-reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s ease-out, transform 0.8s ease-out;
}
.section-reveal.revealed {
  opacity: 1;
  transform: translateY(0);
}

/* Header */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 50;
}
.header-glass {
  background: rgba(250, 250, 250, 0.75);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 5%;
  transition: padding var(--transition);
}
.logo {
  font-weight: 600;
  font-size: 1.25rem;
  letter-spacing: -0.03em;
  text-decoration: none;
  color: var(--text);
}
.logo-accent { color: var(--violet); }

.main-nav { display: none; }
.nav-list {
  display: flex;
  gap: 32px;
  list-style: none;
  margin: 0;
  padding: 0;
}
.nav-list a {
  text-decoration: none;
  color: var(--text-secondary);
  font-size: 0.875rem;
  font-weight: 500;
  position: relative;
  transition: color var(--transition);
}
.nav-list a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 50%;
  width: 0;
  height: 2px;
  background: var(--violet);
  transition: width var(--transition), left var(--transition);
}
.nav-list a:hover { color: var(--text); }
.nav-list a:hover::after { width: 100%; left: 0; }

.mobile-menu-toggle {
  display: flex;
  flex-direction: column;
  gap: 4px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}
.toggle-bar {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text);
  transition: transform 0.3s ease, opacity 0.3s ease;
}
.mobile-menu-toggle[aria-expanded="true"] .toggle-bar:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.mobile-menu-toggle[aria-expanded="true"] .toggle-bar:nth-child(2) { opacity: 0; }
.mobile-menu-toggle[aria-expanded="true"] .toggle-bar:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

.main-nav.open {
  display: block;
  position: absolute;
  top: 100%;
  left: 0;
  width: 100%;
  background: rgba(250,250,250,0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
  padding: 24px 5%;
}
.main-nav.open .nav-list {
  flex-direction: column;
  gap: 16px;
}

@media (min-width: 768px) {
  .mobile-menu-toggle { display: none; }
  .main-nav { display: block; }
  .main-nav.open {
    position: static;
    width: auto;
    background: transparent;
    border: none;
    padding: 0;
  }
  .main-nav.open .nav-list { flex-direction: row; gap: 32px; }
}

/* Hero */
.hero {
  position: relative;
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 120px 5% 80px;
  overflow: hidden;
}
.hero-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  opacity: 0.4;
  pointer-events: none;
}
.hero-content {
  position: relative;
  z-index: 1;
  max-width: 800px;
  text-align: center;
  padding: 48px 40px;
}
.hero-title {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin-bottom: 24px;
}
.hero-lead {
  font-size: clamp(1rem, 2vw, 1.25rem);
  color: var(--text-secondary);
  margin-bottom: 32px;
  max-width: 600px;
  margin-inline: auto;
}
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 28px;
  border-radius: 100px;
  font-weight: 500;
  font-size: 0.9rem;
  text-decoration: none;
  transition: transform var(--transition), box-shadow var(--transition);
  cursor: pointer;
  border: 1px solid transparent;
}
.btn-primary {
  background: var(--text);
  color: var(--bg);
  border-color: var(--text);
}
.btn-primary:hover {
  transform: translateY(-2px) scale(1.02);
  box-shadow: 0 10px 30px rgba(17,17,17,0.15);
}

/* Sections common */
.section-tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--violet);
  margin-bottom: 12px;
}
.section-title {
  font-size: clamp(1.75rem, 3vw, 2.5rem);
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.2;
  margin-bottom: 16px;
}
.section-subtitle {
  color: var(--text-secondary);
  font-size: 1.05rem;
  max-width: 600px;
}
.section-body {
  color: var(--text-secondary);
  margin-bottom: 16px;
}

/* Institute */
.institute {
  padding: 100px 0;
}
.institute-layout {
  display: grid;
  gap: 60px;
  align-items: center;
}
@media (min-width: 900px) {
  .institute-layout { grid-template-columns: 1fr 1fr; }
}
.institute-text { max-width: 540px; }

/* Room widget */
.room-widget {
  background: var(--surface);
  backdrop-filter: blur(10px);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
}
.room-svg { width: 100%; height: auto; display: block; }
.room-controls {
  display: flex;
  gap: 8px;
  margin-top: 16px;
  flex-wrap: wrap;
}
.room-btn {
  padding: 6px 14px;
  border: 1px solid var(--border);
  background: var(--surface-solid);
  border-radius: 100px;
  font-size: 0.8rem;
  cursor: pointer;
  transition: all var(--transition);
  color: var(--text-secondary);
}
.room-btn:hover {
  border-color: var(--violet);
  color: var(--violet);
}
.room-btn.active {
  background: var(--violet);
  color: #fff;
  border-color: var(--violet);
}

/* Learning */
.learning {
  padding: 100px 0;
  background: linear-gradient(180deg, var(--bg) 0%, #f3f0ff 100%);
}
.section-header {
  margin-bottom: 60px;
}
.learning-grid {
  display: grid;
  gap: 24px;
}
@media (min-width: 640px) { .learning-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1024px) { .learning-grid { grid-template-columns: repeat(4, 1fr); } }

.learning-card h3 {
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 8px;
}
.learning-card p {
  font-size: 0.95rem;
  color: var(--text-secondary);
  margin-bottom: 16px;
}
.card-icon {
  width: 40px;
  height: 40px;
  color: var(--violet);
  margin-bottom: 16px;
}
.card-meta {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--violet);
}

/* Sound Lab */
.soundlab {
  padding: 100px 0;
}
.lab-grid {
  display: grid;
  gap: 32px;
}
@media (min-width: 640px) { .lab-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1024px) { .lab-grid { grid-template-columns: repeat(3, 1fr); } }

.lab-card {
  border-radius: var(--radius);
  overflow: hidden;
  transition: transform var(--transition);
  position: relative;
}
.lab-card:hover { transform: translateY(-6px); }
.lab-image {
  width: 100%;
  aspect-ratio: 4 / 3;
  overflow: hidden;
  background: #eee;
}
.lab-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.6s ease;
}
.lab-card:hover .lab-image img { transform: scale(1.05); }
.lab-content {
  padding: 28px;
  border-top: none;
}
.lab-content h3 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 16px;
}
.lab-meta {
  display: grid;
  gap: 12px;
  margin: 0;
}
.lab-meta div {
  display: flex;
  flex-direction: column;
}
.lab-meta dt {
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-secondary);
  margin-bottom: 2px;
}
.lab-meta dd {
  font-size: 0.95rem;
  color: var(--text);
  margin: 0;
}

/* Mouse glow on cards */
.learning-card::after,
.lab-card::after {
  content: '';
  position: absolute;
  left: var(--mouse-x, -9999px);
  top: var(--mouse-y, -9999px);
  width: 250px;
  height: 250px;
  background: radial-gradient(circle, rgba(139,92,246,0.18) 0%, transparent 70%);
  transform: translate(-50%, -50%);
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.3s ease;
}
.learning-card:hover::after,
.lab-card:hover::after { opacity: 1; }

/* Studio */
.studio {
  padding: 100px 0;
  background: linear-gradient(180deg, #f3f0ff 0%, var(--bg) 100%);
}
.studio-layout {
  display: grid;
  gap: 60px;
}
@media (min-width: 900px) {
  .studio-layout { grid-template-columns: 1fr 1.2fr; }
}
.contact-address {
  margin-top: 32px;
  font-style: normal;
}
.contact-address p {
  margin-bottom: 20px;
  color: var(--text-secondary);
}
.contact-address a {
  color: var(--text);
  text-decoration: none;
  border-bottom: 1px solid var(--border);
  transition: border-color var(--transition), color var(--transition);
}
.contact-address a:hover {
  color: var(--violet);
  border-color: var(--violet);
}

.inquiry-form {
  display: grid;
  gap: 20px;
}
.form-group {
  display: flex;
  flex-direction: column;
}
.form-group label {
  font-size: 0.825rem;
  font-weight: 500;
  margin-bottom: 6px;
  color: var(--text-secondary);
}
.form-group input,
.form-group select,
.form-group textarea {
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--surface-solid);
  font-family: inherit;
  font-size: 0.95rem;
  color: var(--text);
  transition: border-color var(--transition), box-shadow var(--transition);
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--violet);
  box-shadow: 0 0 0 3px var(--violet-soft);
}
.form-group textarea { resize: vertical; }

.error-message {
  font-size: 0.8rem;
  color: #ef4444;
  margin-top: 4px;
  min-height: 1.2em;
}
.form-status {
  font-size: 0.9rem;
  min-height: 1.2em;
  margin-top: 4px;
}

/* Footer */
.site-footer {
  padding: 60px 0 40px;
  border-top: 1px solid var(--border);
}
.footer-grid {
  display: grid;
  gap: 24px;
}
@media (min-width: 768px) {
  .footer-grid { grid-template-columns: 1fr auto 1fr; align-items: center; }
}
.footer-brand {
  font-weight: 600;
  font-size: 1.1rem;
  margin: 0;
}
.footer-copy {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin: 4px 0 0;
}
.footer-nav {
  display: flex;
  gap: 24px;
  list-style: none;
  margin: 0;
  padding: 0;
  flex-wrap: wrap;
}
.footer-nav a {
  font-size: 0.875rem;
  color: var(--text-secondary);
  text-decoration: none;
  transition: color var(--transition);
}
.footer-nav a:hover { color: var(--violet); }
.footer-legal {
  font-size: 0.875rem;
  color: var(--text-secondary);
}
@media (min-width: 768px) {
  .footer-legal { text-align: right; }
}