/* ==========================================================================
   Annularity Studio - Layout & Structural Architecture
   Minimalist, High-Precision Engineering Firm
   ========================================================================== */

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: var(--font-sans);
}

button, input, textarea, select {
  font-family: var(--font-sans);
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 96px;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-sans);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  overflow-x: clip;
  width: 100%;
  max-width: 100%;
  touch-action: pan-y;
}

body {
  min-height: 100vh;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  overflow-x: clip;
  width: 100%;
  max-width: 100%;
  position: relative;
  touch-action: pan-y;
}

.site-wrapper {
  width: 100%;
  max-width: 100%;
  overflow-x: hidden;
  overflow-x: clip;
  position: relative;
  touch-action: pan-y;
}

main {
  width: 100%;
  max-width: 100%;
  overflow-x: hidden;
  overflow-x: clip;
}

img {
  max-width: 100%;
  height: auto;
}

/* Containers */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 1;
  box-sizing: border-box;
}

.container-wide {
  width: 100%;
  max-width: var(--max-width-wide);
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 1;
  box-sizing: border-box;
}

/* ==========================================================================
   Header & Fixed Navigation HUD
   ========================================================================== */
.site-header {
  position: fixed;
  top: 14px;
  left: 0;
  right: 0;
  width: 100%;
  max-width: 100%;
  box-sizing: border-box;
  z-index: 100;
  pointer-events: none;
  transition: transform var(--transition-base);
}

.nav-bar {
  pointer-events: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  box-sizing: border-box;
  background: var(--bg-glass);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 10px 22px;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.4);
  transition: border-color var(--transition-fast), background var(--transition-fast);
}

.nav-bar:hover {
  border-color: var(--border-strong);
}

/* Brand Identity */
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  flex-shrink: 0;
  user-select: none;
}

.brand-isotype {
  height: 24px;
  width: 24px;
  object-fit: contain;
  display: block;
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

.brand-text {
  font-family: var(--font-sans);
  font-size: 16px;
  font-weight: 400;
  letter-spacing: -0.01em;
  color: var(--text-primary);
  line-height: 1;
  transition: color var(--transition-fast);
}

.brand:hover .brand-isotype {
  transform: scale(1.05);
  opacity: 0.95;
}

.brand:hover .brand-text {
  color: #FFFFFF;
}

.brand-logotype {
  height: 26px;
  width: auto;
  max-width: 170px;
  object-fit: contain;
  display: block;
  transition: opacity var(--transition-fast);
}

.brand:hover .brand-logotype {
  opacity: 0.9;
}

/* Nav Links */
.nav-links {
  display: flex;
  align-items: center;
  gap: 6px;
  list-style: none;
}

.nav-link {
  font-family: var(--font-sans);
  font-size: 13.5px;
  font-weight: 500;
  color: var(--text-muted);
  text-decoration: none;
  padding: 8px 14px;
  border-radius: var(--radius-xs);
  transition: color var(--transition-fast), background var(--transition-fast);
}

.nav-link:hover {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.04);
}

/* Header Actions */
.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* Mobile Toggle */
.mobile-toggle {
  display: none;
  background: transparent;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xs);
  color: var(--text-secondary);
  cursor: pointer;
  padding: 7px;
  transition: all var(--transition-fast);
  line-height: 0;
}

.mobile-toggle:hover {
  color: var(--text-primary);
  border-color: var(--border-light);
  background: rgba(255, 255, 255, 0.04);
}

.mobile-toggle .close-icon {
  display: none;
}

.mobile-toggle.active .hamburger-icon {
  display: none;
}

.mobile-toggle.active .close-icon {
  display: block;
}

/* Mobile Menu Drawer */
.mobile-drawer {
  display: none;
}

/* ==========================================================================
   Section Structures
   ========================================================================== */
.section {
  padding: 110px 0;
  position: relative;
  z-index: 1;
}

.section-alt {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-subtle);
  border-bottom: 1px solid var(--border-subtle);
}

.section-header {
  margin-bottom: 60px;
  max-width: 680px;
}

.section-tag {
  display: inline-block;
  font-family: var(--font-sans);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent-light);
  margin-bottom: 12px;
}

.section-title {
  font-size: clamp(28px, 4.2vw, 42px);
  font-weight: 600;
  letter-spacing: -0.03em;
  line-height: 1.15;
  color: var(--text-primary);
  margin-bottom: 14px;
  word-break: break-word;
  overflow-wrap: break-word;
}

.section-desc {
  font-size: 16px;
  color: var(--text-muted);
  line-height: 1.6;
}

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer {
  border-top: 1px solid var(--border-subtle);
  background: var(--bg-secondary);
  padding: 70px 0 35px;
  position: relative;
  z-index: 1;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 50px;
  margin-bottom: 60px;
}

.footer-brand p {
  color: var(--text-muted);
  font-size: 14.5px;
  line-height: 1.6;
  margin-top: 16px;
  max-width: 380px;
}

.footer-col-title {
  font-family: var(--font-sans);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-secondary);
  margin-bottom: 18px;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-links a {
  color: var(--text-muted);
  font-size: 14px;
  text-decoration: none;
  transition: color var(--transition-fast);
}

.footer-links a:hover {
  color: var(--text-primary);
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 30px;
  border-top: 1px solid var(--border-subtle);
  font-size: 13px;
  color: var(--text-dim);
}

/* ==========================================================================
   Responsive Adaptations
   ========================================================================== */
@media (max-width: 992px) {
  .nav-links {
    display: none;
  }

  .nav-actions .btn-nav {
    display: none !important;
  }

  .mobile-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
  }

  .mobile-drawer {
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 68px;
    left: 20px;
    right: 20px;
    max-height: calc(100vh - 85px);
    overflow-y: auto;
    background: rgba(10, 10, 15, 0.98);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-md);
    padding: 22px;
    gap: 10px;
    backdrop-filter: blur(28px);
    -webkit-backdrop-filter: blur(28px);
    box-shadow: 0 20px 45px rgba(0, 0, 0, 0.85);
    z-index: 99;
    transform: translateY(-12px);
    opacity: 0;
    pointer-events: none;
    transition: transform var(--transition-base), opacity var(--transition-base);
  }

  .mobile-drawer.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .mobile-drawer .nav-link {
    font-size: 15px;
    padding: 10px 14px;
    color: var(--text-secondary);
    border-radius: var(--radius-xs);
  }

  .mobile-drawer .btn {
    margin-top: 8px;
    width: 100%;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 40px;
  }

  .section {
    padding: 85px 0;
  }
}

@media (max-width: 768px) {
  .container, .container-wide {
    padding: 0 20px;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .section {
    padding: 75px 0;
  }
}

@media (max-width: 600px) {
  .site-header {
    top: 10px;
  }

  .container, .container-wide {
    padding: 0 16px;
  }

  .nav-bar {
    padding: 8px 14px;
  }

  .brand-logotype {
    height: 22px;
    max-width: 140px;
  }

  .brand-isotype {
    height: 21px;
    width: 21px;
  }

  .brand-text {
    font-size: 15px;
  }

  .mobile-drawer {
    top: 58px;
    left: 14px;
    right: 14px;
    padding: 18px 16px;
  }

  .section {
    padding: 60px 0;
  }

  .section-header {
    margin-bottom: 36px;
  }

  .section-title {
    font-size: clamp(24px, 6.8vw, 32px);
  }

  .section-desc {
    font-size: 14.5px;
    line-height: 1.55;
  }

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
  }
}

@media (max-width: 400px) {
  .site-header {
    top: 8px;
  }

  .container, .container-wide {
    padding: 0 12px;
  }

  .nav-bar {
    padding: 7px 12px;
    border-radius: var(--radius-sm);
  }

  .brand-logotype {
    height: 20px;
    max-width: 125px;
  }

  .brand-isotype {
    height: 19px;
    width: 19px;
  }

  .brand-text {
    font-size: 14px;
  }

  .mobile-drawer {
    top: 54px;
    left: 10px;
    right: 10px;
    padding: 16px 14px;
  }
}