/* ── Nav ──────────────────────────────────────────────────────────────────── */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  background: rgba(255,255,255,0);
  transition: background .3s, box-shadow .3s;
}
.nav--scrolled {
  background: rgba(255,255,255,.96);
  box-shadow: 0 1px 0 rgba(0,0,0,.08);
  backdrop-filter: blur(8px);
}
.nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 48px;
  height: 64px;
  display: flex;
  align-items: center;
  gap: 2rem;
}
.nav-logo {
  display: flex;
  align-items: center;
  gap: .5rem;
  text-decoration: none;
  font-weight: 700;
  font-size: 1rem;
  color: var(--text);
  flex-shrink: 0;
}
.nav-logo-img {
  width: 30px;
  height: 30px;
  object-fit: contain;
  border-radius: 6px;
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 2rem;
  margin-left: auto;
}
.nav-links a {
  text-decoration: none;
  font-size: .9rem;
  font-weight: 500;
  color: var(--muted);
  transition: color .2s;
}
.nav-links a:hover,
.nav-links a.active { color: var(--text); }
.nav-burger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
  margin-left: auto;
}
.nav-burger span {
  display: block;
  width: 22px; height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: transform .25s, opacity .25s;
}
.nav-burger--open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-burger--open span:nth-child(2) { opacity: 0; }
.nav-burger--open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ── Scroll reveal ────────────────────────────────────────────────────────── */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity .55s ease, transform .55s ease;
}
.reveal.revealed {
  opacity: 1;
  transform: none;
}
.features-grid .reveal:nth-child(2) { transition-delay: .1s; }
.features-grid .reveal:nth-child(3) { transition-delay: .2s; }
.circle-grid .reveal:nth-child(2) { transition-delay: .1s; }
.circle-grid .reveal:nth-child(3) { transition-delay: .2s; }
.whom-grid .reveal:nth-child(2) { transition-delay: .1s; }
.overview-cols .reveal:nth-child(2) { transition-delay: .1s; }

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

:root {
  --accent: #4950bc;
  --text:   #0a0a0a;
  --muted:  #374151;
  --white:  #ffffff;
  --font:   'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  font-size: 16px;
  color: var(--text);
  background: var(--white);
  -webkit-font-smoothing: antialiased;
  line-height: 1.6;
}

img { display: block; max-width: 100%; }
a { color: var(--accent); text-decoration: underline; }
a:hover { opacity: .8; }

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 48px;
}

/* ── Section titles ───────────────────────────────────────────────────────── */
.section-title {
  font-size: clamp(2rem, 3.5vw, 2.75rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -.03em;
  color: var(--text);
  margin-bottom: 2.5rem;
}

.subheading-bold {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 1.25rem;
}

/* ═══════════════════════════════════════════════════════════════════════════
   1. HERO
═══════════════════════════════════════════════════════════════════════════ */
.hero {
  display: flex;
  min-height: 100vh;
  max-height: 860px;
  padding-top: 64px;
}

.hero-left {
  flex: 0 0 50%;
  display: flex;
  align-items: center;
  padding: 80px 64px;
  background: var(--white);
}

.hero-content { max-width: 480px; }

.hero-title {
  font-size: clamp(2.2rem, 3.8vw, 3.2rem);
  font-weight: 800;
  line-height: 1.12;
  letter-spacing: -.04em;
  color: var(--text);
  margin-bottom: 1.25rem;
}

.hero-sub {
  font-size: 1rem;
  color: var(--muted);
  line-height: 1.65;
  margin-bottom: 2rem;
}

.hero-badges {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.hero-badges li {
  display: flex;
  align-items: center;
  gap: .75rem;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
}

.badge-icon {
  width: 32px;
  height: 32px;
  flex-shrink: 0;
}

.hero-right {
  flex: 0 0 50%;
  overflow: hidden;
}

.hero-right img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

/* ═══════════════════════════════════════════════════════════════════════════
   2. OVERVIEW
═══════════════════════════════════════════════════════════════════════════ */
.overview {
  position: relative;
  padding: 100px 48px;
  background-image: url('images/overview-bg.jpg');
  background-size: cover;
  background-position: center 30%;
  overflow: hidden;
}

.overview::before {
  content: '';
  position: absolute;
  inset: 0;
  background: rgba(255,255,255,.72);
  backdrop-filter: blur(2px);
}

.overview-inner {
  position: relative;
  max-width: 1200px;
  margin: 0 auto;
}

.overview-heading {
  margin-bottom: 3rem;
}

.overview-cols {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
}

.col-heading {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: .875rem;
}

.overview-col p {
  font-size: .9375rem;
  color: var(--muted);
  line-height: 1.7;
  margin-bottom: .75rem;
}
.overview-col p:last-child { margin-bottom: 0; }

/* ═══════════════════════════════════════════════════════════════════════════
   3. FEATURES
═══════════════════════════════════════════════════════════════════════════ */
.features {
  padding: 88px 0;
  background: var(--white);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2.5rem;
}

.feature-card { display: flex; flex-direction: column; gap: 1.25rem; }

.feature-img-wrap {
  border-radius: 12px;
  overflow: hidden;
  aspect-ratio: 4/3;
}

.feature-img-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.feature-card h3 {
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--text);
  line-height: 1.35;
}

.feature-card ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: .5rem;
}

.feature-card ul li {
  font-size: .875rem;
  color: var(--muted);
  line-height: 1.6;
  padding-left: 1.1rem;
  position: relative;
}

.feature-card ul li::before {
  content: '•';
  position: absolute;
  left: 0;
  color: var(--muted);
}

/* ═══════════════════════════════════════════════════════════════════════════
   4. FOR WHOM
═══════════════════════════════════════════════════════════════════════════ */
.for-whom {
  position: relative;
  padding: 100px 48px;
  background-image: url('images/for-whom-bg.jpg');
  background-size: cover;
  background-position: center 60%;
  overflow: hidden;
}

.for-whom::before {
  content: '';
  position: absolute;
  inset: 0;
  background: rgba(255,255,255,.75);
  backdrop-filter: blur(2px);
}

.for-whom-inner {
  position: relative;
  max-width: 1200px;
  margin: 0 auto;
}

.for-whom .section-title { margin-bottom: 1.5rem; }

.whom-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem 3rem;
}

.whom-item {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
}

.whom-icon {
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.whom-icon svg {
  width: 36px;
  height: 36px;
}

.whom-item h4 {
  font-size: .9375rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: .35rem;
  line-height: 1.35;
}

.whom-item p {
  font-size: .875rem;
  color: var(--muted);
  line-height: 1.6;
}

/* ═══════════════════════════════════════════════════════════════════════════
   5. ADVANTAGES + INSTALLATION
═══════════════════════════════════════════════════════════════════════════ */
.advantages {
  padding: 88px 0;
  background: var(--white);
}

.circle-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 3rem;
}

.circle-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 1.25rem;
}

.circle-img {
  width: 180px;
  height: 180px;
  border-radius: 50%;
  overflow: hidden;
  flex-shrink: 0;
}

.circle-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.circle-card h3 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
  line-height: 1.35;
}

.circle-card p {
  font-size: .875rem;
  color: var(--muted);
  line-height: 1.65;
}

/* ═══════════════════════════════════════════════════════════════════════════
   6. CTA
═══════════════════════════════════════════════════════════════════════════ */
.cta {
  display: flex;
  min-height: 600px;
  max-height: 800px;
}

.cta-left {
  flex: 0 0 50%;
  display: flex;
  align-items: center;
  padding: 80px 64px;
  background: var(--white);
}

.cta-content { max-width: 460px; }

.cta-title {
  font-size: clamp(2rem, 3.2vw, 2.75rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -.04em;
  color: var(--text);
  margin-bottom: 1.5rem;
}

.cta-content p {
  font-size: .9375rem;
  color: var(--muted);
  line-height: 1.7;
  margin-bottom: 1rem;
}

.cta-content a {
  font-weight: 600;
  color: var(--accent);
}

.cta-right {
  flex: 0 0 50%;
  overflow: hidden;
}

.cta-right img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

/* ═══════════════════════════════════════════════════════════════════════════
   7. DOCUMENTS
═══════════════════════════════════════════════════════════════════════════ */
.documents {
  padding: 88px 0;
  background: var(--white);
}

.docs-desc {
  font-size: .9375rem;
  color: var(--muted);
  line-height: 1.7;
  margin-bottom: 2.5rem;
  max-width: 760px;
}

.docs-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2.5rem;
}

.doc-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 1.25rem;
  text-decoration: none;
  transition: transform .3s ease;
}

.doc-card:hover { transform: translateY(-3px); opacity: 1; }

.doc-icon {
  width: 72px;
  height: 72px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: #f0f1ff;
  color: var(--accent);
  transition: background .3s ease;
}

.doc-card:hover .doc-icon { background: #e3e4ff; }

.doc-icon svg {
  width: 32px;
  height: 32px;
}

.doc-card h3 {
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--text);
  line-height: 1.35;
}

.doc-card p {
  font-size: .875rem;
  color: var(--muted);
  line-height: 1.65;
  margin: 0;
}

.doc-meta {
  font-size: .8125rem;
  color: var(--accent);
  font-weight: 600;
}

/* ═══════════════════════════════════════════════════════════════════════════
   8. FOOTER
═══════════════════════════════════════════════════════════════════════════ */
.footer {
  position: relative;
  background-image: url('images/footer-bg.jpg');
  background-size: cover;
  background-position: center;
  padding: 80px 48px;
  overflow: hidden;
}

.footer::before {
  content: '';
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,.55);
}

.footer-inner {
  position: relative;
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem 5rem;
}

.footer-col h4 {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 1.5rem;
}

.footer-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 1.1rem;
}

.footer-list li {
  display: flex;
  align-items: flex-start;
  gap: .75rem;
  font-size: .9rem;
  color: rgba(255,255,255,.85);
  line-height: 1.5;
}

.footer-list li svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  margin-top: 2px;
  opacity: .8;
}

.footer-list a {
  color: rgba(255,255,255,.85);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.footer-list a:hover { color: var(--white); opacity: 1; }

/* ═══════════════════════════════════════════════════════════════════════════
   RESPONSIVE
═══════════════════════════════════════════════════════════════════════════ */
@media (max-width: 1024px) {
  .hero, .cta { flex-direction: column; max-height: none; }
  .hero-left, .cta-left { flex: none; padding: 64px 40px; }
  .hero-right, .cta-right { flex: none; height: 50vw; }
  .features-grid, .circle-grid { grid-template-columns: 1fr 1fr; }
  .overview-cols, .whom-grid, .docs-grid, .footer-inner { grid-template-columns: 1fr; gap: 2rem; }
}

@media (max-width: 768px) {
  .nav-inner { padding: 0 24px; }
  .nav-links {
    display: none;
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    position: absolute;
    top: 64px; left: 0; right: 0;
    background: rgba(255,255,255,.98);
    box-shadow: 0 4px 16px rgba(0,0,0,.08);
    padding: 12px 0 20px;
  }
  .nav-links--open { display: flex; }
  .nav-links a { padding: 12px 24px; width: 100%; }
  .nav-burger { display: flex; }
}

@media (max-width: 640px) {
  .container { padding: 0 24px; }
  .hero-left, .cta-left { padding: 48px 24px; }
  .overview, .for-whom, .footer { padding: 72px 24px; }
  .features, .advantages { padding: 64px 0; }
  .features-grid, .circle-grid, .docs-grid { grid-template-columns: 1fr; }
  .section-title { font-size: 1.75rem; }
  .hero { padding-top: 64px; min-height: auto; }
  .hero-right { height: 60vw; }
}