/* ============================================================
   Universal Acoustics — Design System
   Тёмная тема, Glassmorphism, Нeon Cyan + Purple
   ============================================================ */

/* --- Google Fonts --- */
@import url('https://fonts.googleapis.com/css2?family=Unbounded:wght@400;600;700&family=Manrope:wght@400;500;600&display=swap');

/* --- CSS Variables --- */
:root {
  --bg-primary:       #0a0a0b;
  --bg-secondary:     #111113;
  --bg-tertiary:      #18181b;

  --accent:           #00d4ff;
  --accent-secondary: #7c3aed;
  --gradient-1:       linear-gradient(135deg, #00d4ff, #7c3aed);

  --text-primary:     #ffffff;
  --text-secondary:   rgba(255,255,255,0.7);
  --text-muted:       rgba(255,255,255,0.4);

  --glass-bg:         rgba(255,255,255,0.05);
  --glass-border:     rgba(255,255,255,0.1);
  --glass-blur:       blur(16px);

  --radius-sm:        8px;
  --radius-md:        16px;
  --radius-lg:        24px;

  --transition:       0.3s ease;

  --header-h:         72px;
}

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

html { scroll-behavior: smooth; overflow-x: hidden; }

body {
  background: var(--bg-primary);
  color: var(--text-primary);
  font-family: 'Manrope', sans-serif;
  font-size: 16px;
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }

/* --- Typography --- */
h1, h2, h3, h4 {
  font-family: 'Unbounded', sans-serif;
  font-weight: 700;
  line-height: 1.2;
}

h1 { font-size: clamp(2rem, 5vw, 3.5rem); }
h2 { font-size: clamp(1.5rem, 3vw, 2.25rem); }
h3 { font-size: clamp(1.1rem, 2vw, 1.5rem); }
h4 { font-size: 1.1rem; }

.section-title {
  font-family: 'Unbounded', sans-serif;
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.section-subtitle {
  color: var(--text-secondary);
  font-size: 1rem;
  margin-bottom: 3rem;
}

.accent { color: var(--accent); }
.gradient-text {
  background: var(--gradient-1);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* --- Layout --- */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

section { padding: 80px 0; }

/* --- Glassmorphism Card --- */
.glass {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border-radius: var(--radius-md);
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 16px;
  border-radius: 50px;
  font-family: 'Manrope', sans-serif;
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  border: none;
  white-space: nowrap;
}

.btn-primary {
  background: var(--gradient-1);
  color: #fff;
}
.btn-primary:hover {
  opacity: 0.85;
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0,212,255,0.3);
}

.btn-outline {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--glass-border);
}
.btn-outline:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-2px);
}

.btn-ghost {
  background: transparent;
  color: var(--accent);
  padding: 10px 0;
}
.btn-ghost:hover { opacity: 0.75; }
.btn-ghost::after { content: ' →'; }

/* --- Header --- */
.header {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--header-h);
  z-index: 100;
  transition: background var(--transition), border-color var(--transition);
}
.header .container { height: 100%; }

.header.scrolled {
  background: rgba(10,10,11,0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--glass-border);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.logo {
  font-family: 'Unbounded', sans-serif;
  font-weight: 700;
  font-size: 1.25rem;
  letter-spacing: -0.02em;
  flex-shrink: 0;
}
.logo img { height: 44px; width: auto; margin-left: -8px; }
.logo span { color: var(--accent); }

.nav { display: flex; align-items: center; gap: 24px; }

@media (max-width: 1300px) {
  .logo img { height: 36px; }
  .nav { gap: 14px; }
  .nav__link { font-size: 0.78rem; }
  .header__cta { font-size: 0.75rem; }
}

.nav__link {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color var(--transition);
  position: relative;
  white-space: nowrap;
}
.nav__link::after {
  content: '';
  position: absolute;
  bottom: -4px; left: 0; right: 0;
  height: 2px;
  background: var(--gradient-1);
  transform: scaleX(0);
  transition: transform var(--transition);
}
.nav__link:hover, .nav__link.active { color: var(--text-primary); }
.nav__link:hover::after, .nav__link.active::after { transform: scaleX(1); }

.header__cta {
  margin-left: 16px;
  padding: 7px 16px;
  font-size: 0.82rem;
  height: 36px;
  box-sizing: border-box;
  flex-shrink: 0;
}

/* Burger */
.burger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  background: none;
  border: none;
  padding: 4px;
}
.burger span {
  display: block;
  width: 24px; height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: var(--transition);
}

/* Mobile nav */
.mobile-nav {
  display: none;
  position: fixed;
  top: var(--header-h); left: 0; right: 0;
  background: rgba(10,10,11,0.97);
  backdrop-filter: blur(20px);
  padding: 24px;
  flex-direction: column;
  gap: 16px;
  border-bottom: 1px solid var(--glass-border);
  z-index: 99;
}
.mobile-nav.open { display: flex; }
.mobile-nav .nav__link { font-size: 1.1rem; }

/* --- Hero --- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  padding-top: var(--header-h);
}

.hero__bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 60% 50% at 70% 50%, rgba(0,212,255,0.08) 0%, transparent 60%),
    radial-gradient(ellipse 40% 60% at 20% 80%, rgba(124,58,237,0.1) 0%, transparent 50%),
    var(--bg-primary);
}

.hero__grill {
  position: absolute;
  inset: 0;
  background-image: url('../images/hero/hero_1.png');
  background-size: cover;
  background-position: center right;
  opacity: 0.18;
}

/* --- Hero Beacons (маяки) --- */
.hero__beacons {
  display: flex;
  gap: 16px;
  margin-top: 48px;
  flex-wrap: wrap;
}

.beacon {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  min-width: 100px;
  text-align: center;
}

.beacon__value {
  font-family: 'Unbounded', sans-serif;
  font-size: 1.5rem;
  font-weight: 700;
  background: var(--gradient-1);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
  margin-bottom: 6px;
}

.beacon__label {
  font-size: 0.75rem;
  color: var(--text-muted);
  line-height: 1.3;
}

.hero__content {
  position: relative;
  z-index: 2;
  max-width: 700px;
}

.hero__tag {
  display: inline-block;
  padding: 6px 16px;
  border-radius: 50px;
  border: 1px solid rgba(0,212,255,0.3);
  color: var(--accent);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 24px;
}

.hero__title { margin-bottom: 24px; }

.hero__desc {
  font-size: 1.1rem;
  color: var(--text-secondary);
  margin-bottom: 40px;
  max-width: 540px;
}

.hero__btns { display: flex; gap: 16px; flex-wrap: wrap; }

.hero__scroll {
  position: absolute;
  bottom: 40px; left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: var(--text-muted);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  animation: bounce 2s infinite;
}
.hero__scroll::before {
  content: '';
  width: 1px; height: 48px;
  background: linear-gradient(to bottom, transparent, var(--accent));
}

@keyframes bounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-50%) translateY(8px); }
}

/* --- Section Header --- */
.section-header { margin-bottom: 48px; }
.section-header--center { text-align: center; }

/* --- News Cards --- */
.news-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.news-card {
  padding: 28px;
  transition: transform var(--transition), border-color var(--transition);
}
.news-card:hover {
  transform: translateY(-4px);
  border-color: rgba(0,212,255,0.3);
}

.news-card__tag {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--accent);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 12px;
}

.news-card__title {
  font-family: 'Unbounded', sans-serif;
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 12px;
  line-height: 1.4;
}

.news-card__desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 20px;
}

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

/* --- Product Cards --- */
.products-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.product-card {
  overflow: hidden;
  transition: transform var(--transition), border-color var(--transition);
  cursor: pointer;
}
.product-card:hover {
  transform: translateY(-6px);
  border-color: rgba(0,212,255,0.3);
}

.product-card__img {
  width: 100%;
  aspect-ratio: 3/4;
  background: radial-gradient(ellipse 80% 80% at 50% 50%, #252528 0%, #0a0a0b 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  font-size: 0.85rem;
  overflow: hidden;
  padding: 20px;
}
.product-card__img img { width: 100%; height: 100%; object-fit: contain; }

.product-card__body { padding: 20px; }

.product-card__series {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--accent);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 8px;
}

.product-card__name {
  font-family: 'Unbounded', sans-serif;
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.product-card__type {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 16px;
}

/* --- Projects Carousel --- */
.projects-carousel { position: relative; overflow: hidden; }

.projects-track {
  display: flex;
  gap: 24px;
  transition: transform 0.5s ease;
}

.project-card {
  width: 360px;
  height: 380px;
  overflow: hidden;
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  transition: transform var(--transition), border-color var(--transition);
}
.project-card:hover {
  transform: translateY(-4px);
  border-color: rgba(0,212,255,0.3);
}

.project-card__img {
  width: 100%;
  height: 200px;
  flex-shrink: 0;
  background: var(--bg-tertiary);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  font-size: 0.85rem;
  overflow: hidden;
}
.project-card__img img { width: 100%; height: 100%; object-fit: cover; }

.project-card__body { padding: 24px; flex: 1; overflow: hidden; display: flex; flex-direction: column; justify-content: flex-start; }

.project-card__location {
  font-size: 0.8rem;
  color: var(--accent);
  margin-bottom: 8px;
}

.project-card__name {
  font-family: 'Unbounded', sans-serif;
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 8px;
  overflow-wrap: break-word;
  word-break: break-word;
}

.project-card__desc {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.carousel-controls {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-top: 32px;
}

.carousel-btn {
  width: 44px; height: 44px;
  border-radius: 50%;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  color: var(--text-primary);
  font-size: 1.1rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}
.carousel-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* --- Testimonials --- */
.testimonials-grid {
  display: flex;
  gap: 24px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  padding-bottom: 16px;
  -webkit-overflow-scrolling: touch;
}
.testimonials-grid::-webkit-scrollbar { height: 4px; }
.testimonials-grid::-webkit-scrollbar-track { background: var(--bg-tertiary); border-radius: 2px; }
.testimonials-grid::-webkit-scrollbar-thumb { background: rgba(0,212,255,0.35); border-radius: 2px; }

.testimonial-card {
  padding: 32px;
  min-width: 300px;
  width: 320px;
  flex-shrink: 0;
  scroll-snap-align: start;
}

.testimonial-card__photo {
  width: calc(100% + 64px);
  max-width: calc(100% + 64px);
  margin: -32px -32px 24px -32px;
  aspect-ratio: 3/4;
  object-fit: cover;
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
  display: block;
}

.testimonial-card__quote {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 24px;
  position: relative;
}
.testimonial-card__quote::before {
  content: '"';
  font-size: 3rem;
  color: var(--accent);
  opacity: 0.4;
  line-height: 1;
  display: block;
  margin-bottom: 8px;
}

.testimonial-card__author { font-weight: 600; font-size: 0.9rem; }
.testimonial-card__company { font-size: 0.8rem; color: var(--text-muted); margin-top: 2px; }

/* --- Catalog Teaser --- */
.catalog-teaser {
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  padding: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 48px;
  border: 1px solid var(--glass-border);
  position: relative;
  overflow: hidden;
}
.catalog-teaser::before {
  content: '';
  position: absolute;
  right: -100px; top: -100px;
  width: 400px; height: 400px;
  background: radial-gradient(circle, rgba(0,212,255,0.08), transparent 70%);
}

.catalog-teaser__content { max-width: 480px; }
.catalog-teaser__title { margin-bottom: 16px; }
.catalog-teaser__desc { color: var(--text-secondary); margin-bottom: 32px; }

.catalog-teaser__stats {
  display: flex;
  gap: 40px;
  margin-bottom: 32px;
}
.stat__value {
  font-family: 'Unbounded', sans-serif;
  font-size: 2rem;
  font-weight: 700;
  color: var(--accent);
}
.stat__label { font-size: 0.85rem; color: var(--text-muted); }

/* --- Contact Form --- */
.contact-section { background: var(--bg-secondary); }

.contact-form-wrap {
  max-width: 640px;
  margin: 0 auto;
}

.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.form-grid .form-group:last-child { grid-column: 1 / -1; }

.form-group { display: flex; flex-direction: column; gap: 8px; }

.form-group label {
  font-size: 0.85rem;
  color: var(--text-secondary);
  font-weight: 500;
}

.form-group input,
.form-group textarea,
.form-group select {
  background: var(--bg-tertiary);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-sm);
  padding: 14px 16px;
  color: var(--text-primary);
  font-family: 'Manrope', sans-serif;
  font-size: 0.95rem;
  transition: border-color var(--transition);
  outline: none;
}
.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  border-color: var(--accent);
}
.form-group textarea { resize: vertical; min-height: 120px; }

.form-submit { margin-top: 8px; width: 100%; justify-content: center; }

/* --- Footer --- */
.footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--glass-border);
  padding: 60px 0 32px;
}

.footer__grid {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 48px;
  margin-bottom: 48px;
}

.footer__brand .logo { margin-bottom: 16px; }
.footer__desc { font-size: 0.875rem; color: var(--text-secondary); max-width: 260px; }

.footer__col-title {
  font-family: 'Unbounded', sans-serif;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 20px;
}

.footer__links { display: flex; flex-direction: column; gap: 12px; }
.footer__link {
  font-size: 0.9rem;
  color: var(--text-secondary);
  transition: color var(--transition);
}
.footer__link:hover { color: var(--accent); }

.footer__contacts { display: flex; flex-direction: column; gap: 12px; }
.footer__contact-item { font-size: 0.9rem; color: var(--text-secondary); }
.footer__contact-item a { transition: color var(--transition); }
.footer__contact-item a:hover { color: var(--accent); }

.footer__bottom {
  border-top: 1px solid var(--glass-border);
  padding-top: 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

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

/* --- Reveal Animations --- */
.reveal {
  opacity: 0;
  transform: translateY(32px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}
.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }

/* --- Divider --- */
.divider {
  width: 48px; height: 3px;
  background: var(--gradient-1);
  border-radius: 2px;
  margin: 16px 0 0;
}

/* ============================================================
   Responsive
   ============================================================ */

@media (max-width: 1024px) {
  .products-grid { grid-template-columns: repeat(2, 1fr); }
  .footer__grid { grid-template-columns: 1fr 1fr; gap: 32px; }
}

@media (max-width: 768px) {
  section { padding: 56px 0; }

  .nav, .header__cta { display: none; }
  .burger { display: flex; }

  .news-grid { grid-template-columns: 1fr; }
  .products-grid { grid-template-columns: repeat(2, 1fr); }
  .testimonial-card { min-width: 260px; width: 280px; }

  .catalog-teaser {
    flex-direction: column;
    padding: 40px 24px;
  }

  .form-grid { grid-template-columns: 1fr; }
  .form-grid .form-group:last-child { grid-column: auto; }

  .footer__grid { grid-template-columns: 1fr; gap: 32px; }
  .footer__bottom { flex-direction: column; gap: 12px; text-align: center; }

  .project-card { min-width: 280px; }
}

@media (max-width: 480px) {
  .products-grid { grid-template-columns: 1fr; }
  .hero__btns { flex-direction: column; align-items: flex-start; }
  .catalog-teaser__stats { flex-direction: column; gap: 16px; }
  h1 { font-size: 1.6rem; }
  .btn { padding: 8px 18px; }
}