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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--color-text-primary);
  background: var(--color-bg-deep);
  line-height: 1.65;
  text-rendering: optimizeLegibility;
}

a {
  color: inherit;
  text-decoration: none;
}

img,
svg {
  max-width: 100%;
  display: block;
}

p {
  margin: 0;
  color: var(--color-text-muted);
}

ul {
  margin: 0;
  padding-left: 1.2rem;
}

h1,
h2,
h3,
h4 {
  margin: 0;
  font-family: var(--font-heading);
  line-height: 1.18;
  letter-spacing: -0.02em;
}

h1,
h2 {
  font-family: var(--font-display);
}

h1 { font-size: clamp(2rem, 8vw, 4rem); }
h2 { font-size: clamp(1.6rem, 5vw, 2.6rem); }
h3 { font-size: clamp(1.25rem, 3.8vw, 1.65rem); }
h4 { font-size: clamp(1.1rem, 3vw, 1.25rem); }

:focus-visible {
  outline: 2px solid var(--color-accent-cyan);
  outline-offset: 2px;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 8px;
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-border);
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-sm);
  z-index: 50;
}

.skip-link:focus {
  left: var(--space-2);
}

.container {
  width: min(1200px, 100% - var(--space-4));
  margin-inline: auto;
}

section {
  padding-block: clamp(var(--space-5), 8vw, var(--space-10));
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(8, 8, 15, 0.82);
  border-bottom: 1px solid var(--color-border);
  backdrop-filter: blur(14px);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 84px;
  gap: var(--space-3);
}

.logo {
  display: inline-flex;
  gap: 14px;
  align-items: center;
  font-family: var(--font-heading);
  font-weight: 800;
  letter-spacing: 0.08em;
  font-size: 0.9rem;
}

.logo svg {
  width: 28px;
  height: 28px;
}

.site-header .logo {
  gap: 14px;
  font-size: 1.35rem;
}

.site-header .logo svg {
  width: 40px;
  height: 40px;
}

.desktop-nav {
  display: none;
}

.nav-list,
.footer-nav-list,
.mobile-nav-list {
  list-style: none;
  display: flex;
  margin: 0;
  padding: 0;
}

.nav-list {
  gap: var(--space-4);
}

.nav-link {
  position: relative;
  font-weight: 500;
  color: var(--color-text-muted);
  transition: color var(--transition-base);
}

.nav-link:hover,
.nav-link.active,
.nav-link[aria-current='page'] {
  color: var(--color-text-primary);
}

.nav-link.active::after,
.nav-link[aria-current='page']::after {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  bottom: -10px;
  height: 2px;
  background: var(--gradient-accent);
}

.mobile-nav {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 30;
  background: rgba(15, 15, 26, 0.88);
  border-top: 1px solid var(--color-border);
  backdrop-filter: blur(16px);
  padding: var(--space-1) var(--space-2) calc(var(--space-1) + env(safe-area-inset-bottom));
}

.mobile-nav-list {
  justify-content: space-between;
  gap: var(--space-1);
}

.mobile-nav-link {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  font-size: 0.7rem;
  color: var(--color-text-muted);
  min-width: 52px;
}

.mobile-nav-link svg {
  width: 18px;
  height: 18px;
  stroke: currentColor;
}

.mobile-nav-link.active,
.mobile-nav-link[aria-current='page'] {
  color: var(--color-accent-cyan);
  font-weight: 600;
}

.mobile-nav-link.active span,
.mobile-nav-link[aria-current='page'] span {
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

main {
  padding-bottom: 86px;
}

.site-footer {
  border-top: 1px solid var(--color-border);
  background: var(--color-bg-surface);
  padding: clamp(var(--space-5), 6vw, var(--space-8)) 0 var(--space-4);
}

.footer-grid {
  display: grid;
  gap: var(--space-5);
}

.footer-nav-list {
  flex-wrap: wrap;
  gap: var(--space-2) var(--space-3);
}

.footer-note {
  font-size: 0.92rem;
}

.contact-email {
  display: inline-block;
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-text-primary);
  margin-top: var(--space-1);
}

.copyright {
  margin-top: var(--space-4);
  font-size: 0.85rem;
}

@media (min-width: 768px) {
  .desktop-nav {
    display: block;
  }

  .mobile-nav {
    display: none;
  }

  main {
    padding-bottom: 0;
  }

  .footer-grid {
    grid-template-columns: 1.1fr 1fr;
  }
}

@media (min-width: 1024px) {
  .container {
    width: min(1200px, 100% - var(--space-6));
  }
}