/* ===== NAVIGATION ===== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-nav);
  padding: var(--space-4) var(--space-6);
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: background var(--transition-base), backdrop-filter var(--transition-base);
}

.site-header.scrolled {
  background: rgba(4, 4, 20, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--color-border);
}

.logo {
  display: flex;
  flex-direction: column;
  gap: 1px;
}

.logo-primary {
  font-size: var(--text-lg);
  font-weight: 800;
  letter-spacing: -0.03em;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
}

.logo-sub {
  font-size: var(--text-xs);
  color: var(--color-text-dim);
  letter-spacing: 0.04em;
  font-family: var(--font-mono);
}

.hamburger {
  display: flex;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: var(--space-2);
  background: none;
  border: none;
  z-index: calc(var(--z-drawer) + 10);
}

.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: transform var(--transition-base), opacity var(--transition-base), width var(--transition-base);
  transform-origin: center;
}

.hamburger.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.active span:nth-child(2) { opacity: 0; width: 0; }
.hamburger.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ===== DRAWER NAV ===== */
.nav-overlay {
  position: fixed;
  inset: 0;
  background: rgba(4, 4, 20, 0.7);
  backdrop-filter: blur(4px);
  z-index: var(--z-overlay);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-base);
}

.nav-overlay.active {
  opacity: 1;
  pointer-events: all;
}

.nav-drawer {
  position: fixed;
  top: 0;
  right: 0;
  width: min(360px, 90vw);
  height: 100%;
  background: var(--color-bg-card);
  border-left: 1px solid var(--color-border);
  z-index: var(--z-drawer);
  transform: translateX(100%);
  transition: transform var(--transition-slow);
  display: flex;
  flex-direction: column;
  padding: var(--space-20) var(--space-10);
  gap: var(--space-2);
}

.nav-drawer.active {
  transform: translateX(0);
}

.nav-drawer a {
  display: block;
  font-size: var(--text-xl);
  font-weight: 600;
  color: var(--color-text-muted);
  padding: var(--space-3) 0;
  border-bottom: 1px solid var(--color-border);
  transition: color var(--transition-fast), padding-left var(--transition-fast);
  letter-spacing: -0.01em;
}

.nav-drawer a:hover {
  color: var(--color-primary);
  padding-left: var(--space-3);
  border-bottom-color: var(--color-border-hover);
}

.nav-drawer .nav-cta {
  margin-top: var(--space-6);
  display: inline-block;
  padding: var(--space-3) var(--space-6);
  background: var(--gradient-primary);
  color: #fff !important;
  border-radius: var(--radius-full);
  font-weight: 700;
  font-size: var(--text-base);
  text-align: center;
  border-bottom: none !important;
}

.nav-drawer .nav-cta:hover {
  padding-left: var(--space-6) !important;
  box-shadow: var(--shadow-glow-primary);
}

/* ===== HERO ===== */
#hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  padding: var(--space-32) var(--space-6) var(--space-20);
}

.hero-content {
  max-width: var(--container-max);
  margin: 0 auto;
  width: 100%;
  position: relative;
  z-index: 2;
}

.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: var(--space-6);
}

.hero-eyebrow::before {
  content: '';
  width: 24px;
  height: 2px;
  background: var(--color-primary);
  display: block;
}

.hero-title {
  font-size: clamp(2.5rem, 6vw, 5rem);
  font-weight: 900;
  line-height: 1.05;
  letter-spacing: -0.04em;
  margin-bottom: var(--space-6);
  max-width: 820px;
}

.hero-desc {
  font-size: var(--text-xl);
  color: var(--color-text-muted);
  max-width: 580px;
  margin-bottom: var(--space-10);
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  gap: var(--space-4);
  flex-wrap: wrap;
}

/* 3D Floating shapes */
.hero-shapes {
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 48%;
  height: 100%;
  pointer-events: none;
  perspective: 1200px;
}

/* ===== SECTIONS ===== */
#services, #about, #why-us, #contact {
  position: relative;
}

#services { background: transparent; }
#about { background: linear-gradient(180deg, transparent, rgba(123, 47, 190, 0.05) 50%, transparent); }
#why-us { background: transparent; }

.section-header {
  margin-bottom: var(--space-12);
}

/* Services grid */
.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-6);
  margin-top: var(--space-8);
}

/* About layout */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-16);
  align-items: center;
}

.about-visual {
  position: relative;
  height: 420px;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Stats grid */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-6);
  margin-top: var(--space-12);
}

/* Contact layout */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-12);
  margin-top: var(--space-12);
}

/* ===== FOOTER ===== */
.site-footer {
  background: var(--color-bg-card);
  border-top: 1px solid var(--color-border);
  padding: var(--space-12) var(--space-6) var(--space-8);
}

.footer-inner {
  max-width: var(--container-max);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: var(--space-12);
  margin-bottom: var(--space-10);
}

.footer-bottom {
  max-width: var(--container-max);
  margin: 0 auto;
  padding-top: var(--space-8);
  border-top: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-4);
}

.footer-copy {
  font-size: var(--text-sm);
  color: var(--color-text-dim);
}

.footer-cn-name {
  font-size: var(--text-sm);
  color: var(--color-text-dim);
  letter-spacing: 0.02em;
}