/* ============================================
   OPTIMAKS — Corporate Telecom Website
   ============================================ */

:root {
  --color-primary: #29617C;
  --color-primary-light: #5093A5;
  --color-muted: #84A0AC;
  --color-surface: #BBD1DB;
  --color-surface-soft: #EEF4F7;
  --color-bg: #FFFFFF;
  --color-text: #1a2733;
  --color-text-muted: #5a6d7a;
  --color-border: rgba(132, 160, 172, 0.25);

  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;

  --container: 1200px;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;

  --shadow-sm: 0 1px 2px rgba(41, 97, 124, 0.06);
  --shadow-md: 0 4px 16px rgba(41, 97, 124, 0.08);
  --shadow-lg: 0 12px 32px rgba(41, 97, 124, 0.12);

  --transition: 200ms ease;
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
img, svg { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }
button { font: inherit; cursor: pointer; border: 0; background: none; color: inherit; }
input, textarea, select { font: inherit; color: inherit; }

/* ---------- Typography ---------- */
h1, h2, h3, h4 { font-weight: 700; line-height: 1.2; color: var(--color-primary); letter-spacing: -0.01em; }
h1 { font-size: clamp(2rem, 4.5vw, 3.5rem); letter-spacing: -0.02em; }
h2 { font-size: clamp(1.75rem, 3.2vw, 2.5rem); }
h3 { font-size: 1.25rem; }
p { color: var(--color-text-muted); }

/* ---------- Layout ---------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}
section { padding: 96px 0; }
@media (max-width: 768px) {
  section { padding: 64px 0; }
}

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition), box-shadow var(--transition);
}
.site-header.is-scrolled {
  border-bottom-color: var(--color-border);
  box-shadow: var(--shadow-sm);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 0;
  gap: 24px;
}
.logo { display: flex; align-items: center; gap: 12px; }
.logo img { height: 44px; width: auto; }
.logo-text {
  font-weight: 700;
  font-size: 1.125rem;
  color: var(--color-primary);
  letter-spacing: -0.01em;
}

.nav {
  display: flex;
  align-items: center;
  gap: 32px;
}
.nav-list {
  display: flex;
  gap: 28px;
  list-style: none;
}
.nav-list a {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--color-text);
  transition: color var(--transition);
}
.nav-list a:hover { color: var(--color-primary); }

.lang-switch {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 0.85rem;
  font-weight: 500;
}
.lang-switch a {
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  color: var(--color-text-muted);
  transition: background var(--transition), color var(--transition);
}
.lang-switch a.active { color: var(--color-primary); background: var(--color-surface-soft); }
.lang-switch a:hover { color: var(--color-primary); }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 0.95rem;
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition);
  white-space: nowrap;
}
.btn-primary {
  background: var(--color-primary);
  color: #fff;
  box-shadow: var(--shadow-sm);
}
.btn-primary:hover {
  background: var(--color-primary-light);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}
.btn-secondary {
  background: transparent;
  color: var(--color-primary);
  border: 1.5px solid var(--color-primary);
}
.btn-secondary:hover {
  background: var(--color-primary);
  color: #fff;
}
.btn-small { padding: 8px 16px; font-size: 0.875rem; }

/* ---------- Mobile menu toggle ---------- */
.menu-toggle {
  display: none;
  width: 40px;
  height: 40px;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
}
.menu-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-primary);
  transition: transform var(--transition), opacity var(--transition);
}
.menu-toggle.is-open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.menu-toggle.is-open span:nth-child(2) { opacity: 0; }
.menu-toggle.is-open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  padding: 120px 0 96px;
  background:
    radial-gradient(1200px 600px at 20% 0%, rgba(80, 147, 165, 0.12), transparent 60%),
    radial-gradient(900px 500px at 90% 30%, rgba(187, 209, 219, 0.3), transparent 60%),
    linear-gradient(180deg, #F7FAFC 0%, #FFFFFF 100%);
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(132, 160, 172, 0.08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(132, 160, 172, 0.08) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse at center, black 40%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse at center, black 40%, transparent 75%);
  pointer-events: none;
}
.hero-inner {
  position: relative;
  max-width: 900px;
  text-align: center;
  margin: 0 auto;
}
.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  background: var(--color-surface-soft);
  color: var(--color-primary);
  border-radius: 999px;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 24px;
  border: 1px solid var(--color-border);
}
.hero-eyebrow::before {
  content: '';
  width: 6px;
  height: 6px;
  background: var(--color-primary-light);
  border-radius: 50%;
}
.hero h1 { margin-bottom: 20px; }
.hero-lead {
  font-size: 1.125rem;
  color: var(--color-text-muted);
  max-width: 680px;
  margin: 0 auto 36px;
}
.hero-ctas { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }

/* ---------- Section header ---------- */
.section-header {
  max-width: 720px;
  margin: 0 auto 56px;
  text-align: center;
}
.section-eyebrow {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-primary-light);
  margin-bottom: 12px;
}
.section-header h2 { margin-bottom: 16px; }
.section-header p { font-size: 1.05rem; }

/* ---------- About ---------- */
.about {
  background: var(--color-bg);
}
.about-grid {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 64px;
  align-items: start;
}
.about-text p { margin-bottom: 16px; font-size: 1.05rem; }
.values {
  display: flex;
  flex-direction: column;
  gap: 20px;
}
.value-item {
  display: flex;
  gap: 16px;
  padding: 20px;
  background: var(--color-surface-soft);
  border-radius: var(--radius-md);
  border-left: 3px solid var(--color-primary-light);
}
.value-icon {
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  background: #fff;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
  box-shadow: var(--shadow-sm);
}
.value-item h3 { font-size: 1.05rem; margin-bottom: 4px; color: var(--color-text); }
.value-item p { font-size: 0.95rem; margin: 0; }

/* ---------- Services ---------- */
.services {
  background: var(--color-surface-soft);
  position: relative;
}
.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.service-card {
  background: #fff;
  padding: 32px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}
.service-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-primary-light);
}
.service-icon {
  width: 56px;
  height: 56px;
  background: linear-gradient(135deg, var(--color-surface) 0%, var(--color-surface-soft) 100%);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
  margin-bottom: 20px;
  transition: background var(--transition), color var(--transition);
}
.service-card:hover .service-icon {
  background: var(--color-primary);
  color: #fff;
}
.service-card h3 { font-size: 1.15rem; margin-bottom: 10px; color: var(--color-text); }
.service-card p { font-size: 0.95rem; }

/* ---------- Contact ---------- */
.contact { background: var(--color-surface-soft); }
.contact-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  max-width: 1000px;
  margin: 0 auto;
}
.contact-card {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 8px;
  padding: 32px;
  background: #fff;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}
.contact-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-primary-light);
}
.contact-card-icon {
  width: 56px;
  height: 56px;
  background: linear-gradient(135deg, var(--color-surface) 0%, var(--color-surface-soft) 100%);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
  margin-bottom: 12px;
  transition: background var(--transition), color var(--transition);
}
.contact-card-primary:hover .contact-card-icon {
  background: var(--color-primary);
  color: #fff;
}
.contact-card strong {
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-primary-light);
}
.contact-card span {
  font-size: 1rem;
  color: var(--color-text);
  line-height: 1.5;
}
.contact-card-primary span {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--color-primary);
}

/* ---------- Footer ---------- */
.site-footer {
  background: #0f2430;
  color: rgba(255, 255, 255, 0.75);
  padding: 64px 0 24px;
  font-size: 0.9rem;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 48px;
}
.footer-brand img { height: 44px; filter: brightness(0) invert(1); margin-bottom: 16px; }
.footer-brand p { color: rgba(255, 255, 255, 0.65); max-width: 360px; }
.footer h4 { color: #fff; font-size: 0.95rem; margin-bottom: 16px; letter-spacing: 0.02em; }
.footer-list { list-style: none; display: flex; flex-direction: column; gap: 10px; }
.footer-list a { color: rgba(255, 255, 255, 0.7); transition: color var(--transition); }
.footer-list a:hover { color: #fff; }
.footer-bottom {
  padding-top: 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 0.825rem;
  color: rgba(255, 255, 255, 0.5);
}

/* ---------- Responsive ---------- */
@media (max-width: 960px) {
  .about-grid { grid-template-columns: 1fr; gap: 40px; }
  .services-grid { grid-template-columns: repeat(2, 1fr); }
  .contact-cards { grid-template-columns: 1fr; max-width: 520px; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  .menu-toggle { display: flex; }
  .nav {
    position: fixed;
    top: 76px;
    left: 0;
    right: 0;
    background: #fff;
    flex-direction: column;
    align-items: stretch;
    padding: 24px;
    gap: 0;
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-md);
    transform: translateY(-120%);
    transition: transform var(--transition);
  }
  .nav.is-open { transform: translateY(0); }
  .nav-list {
    flex-direction: column;
    gap: 4px;
    width: 100%;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--color-border);
    margin-bottom: 16px;
  }
  .nav-list a { display: block; padding: 12px 0; }
  .hero { padding: 72px 0 64px; }
  .hero-ctas { flex-direction: column; }
  .hero-ctas .btn { width: 100%; }
  .services-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .footer-bottom { flex-direction: column; }
}

@media (max-width: 480px) {
  .logo-text { display: none; }
}

/* ---------- Accessibility ---------- */
:focus-visible {
  outline: 2px solid var(--color-primary-light);
  outline-offset: 2px;
}
.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0);
  white-space: nowrap; border: 0;
}