/* =============================================
   PLEXUS AI — Shared Stylesheet
   Premium Navy & Gold Brand
   ============================================= */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=Playfair+Display:wght@600;700&display=swap');

/* ── Variables ── */
:root {
  --bg-primary:    #04080f;
  --bg-secondary:  #08111f;
  --bg-card:       #0b1828;
  --bg-card-hover: #0e1f35;
  --gold:          #c9a145;
  --gold-light:    #e4c070;
  --gold-dim:      rgba(201,161,69,0.12);
  --gold-border:   rgba(201,161,69,0.25);
  --gold-border-h: rgba(201,161,69,0.6);
  --text-primary:  #eef2ff;
  --text-secondary:#8a9bbf;
  --text-muted:    #4a5c7a;
  --white:         #ffffff;
  --nav-height:    72px;
  --radius:        12px;
  --radius-lg:     20px;
  --transition:    0.3s ease;
  --shadow-gold:   0 0 40px rgba(201,161,69,0.08);
  --shadow-card:   0 8px 40px rgba(0,0,0,0.4);
}

/* ── Reset ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: 'Inter', sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  overflow-x: hidden;
}
img { max-width: 100%; display: block; }
a { text-decoration: none; color: inherit; }

/* ── Navigation ── */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-height);
  z-index: 1000;
  display: flex;
  align-items: center;
  padding: 0 5%;
  background: rgba(4,8,15,0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(201,161,69,0.12);
  transition: background var(--transition);
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.nav-logo svg { width: 38px; height: 38px; }

.nav-brand {
  display: flex;
  flex-direction: column;
  line-height: 1;
}
.nav-brand-name {
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 3px;
  color: var(--text-primary);
  text-transform: uppercase;
}
.nav-brand-sub {
  font-size: 9px;
  letter-spacing: 4px;
  color: var(--gold);
  text-transform: uppercase;
  font-weight: 500;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 36px;
  margin-left: auto;
  list-style: none;
}
.nav-links a {
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--text-secondary);
  transition: color var(--transition);
  position: relative;
}
.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px; left: 0; right: 0;
  height: 1px;
  background: var(--gold);
  transform: scaleX(0);
  transition: transform var(--transition);
}
.nav-links a:hover,
.nav-links a.active { color: var(--gold); }
.nav-links a:hover::after,
.nav-links a.active::after { transform: scaleX(1); }

.nav-cta {
  margin-left: 36px;
  padding: 9px 24px;
  background: transparent;
  border: 1px solid var(--gold);
  border-radius: 4px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--gold) !important;
  transition: all var(--transition);
}
.nav-cta:hover {
  background: var(--gold);
  color: var(--bg-primary) !important;
}
.nav-cta::after { display: none !important; }

/* ── Buttons ── */
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 16px 40px;
  background: var(--gold);
  color: var(--bg-primary);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none;
}
.btn-primary:hover {
  background: var(--gold-light);
  transform: translateY(-2px);
  box-shadow: 0 10px 30px rgba(201,161,69,0.3);
}

.btn-outline {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 15px 38px;
  background: transparent;
  color: var(--text-primary);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 2px;
  text-transform: uppercase;
  border: 1px solid var(--gold-border);
  border-radius: 4px;
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none;
}
.btn-outline:hover {
  border-color: var(--gold);
  color: var(--gold);
  transform: translateY(-2px);
}

/* ── Section Utilities ── */
.section { padding: 100px 5%; }
.section-sm { padding: 60px 5%; }

.section-label {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 4px;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 20px;
}
.section-label::before {
  content: '';
  display: block;
  width: 30px;
  height: 1px;
  background: var(--gold);
}

.section-title {
  font-family: 'Playfair Display', serif;
  font-size: clamp(32px, 4vw, 52px);
  font-weight: 700;
  line-height: 1.2;
  color: var(--text-primary);
  margin-bottom: 20px;
}
.section-title span { color: var(--gold); }

.section-desc {
  font-size: 17px;
  color: var(--text-secondary);
  max-width: 600px;
  line-height: 1.8;
}

/* ── Gold Divider ── */
.gold-line {
  width: 60px;
  height: 2px;
  background: linear-gradient(90deg, var(--gold), transparent);
  margin: 24px 0;
}

/* ── Cards ── */
.card {
  background: var(--bg-card);
  border: 1px solid var(--gold-border);
  border-radius: var(--radius-lg);
  padding: 40px;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}
.card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--gold), transparent);
  opacity: 0;
  transition: opacity var(--transition);
}
.card:hover {
  background: var(--bg-card-hover);
  border-color: var(--gold-border-h);
  transform: translateY(-6px);
  box-shadow: var(--shadow-card), var(--shadow-gold);
}
.card:hover::before { opacity: 1; }

/* ── Icon Box ── */
.icon-box {
  width: 64px;
  height: 64px;
  border-radius: 14px;
  background: var(--gold-dim);
  border: 1px solid var(--gold-border);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 28px;
  flex-shrink: 0;
}
.icon-box svg { width: 28px; height: 28px; color: var(--gold); }

/* ── Stats ── */
.stat-number {
  font-family: 'Playfair Display', serif;
  font-size: 48px;
  font-weight: 700;
  color: var(--gold);
  line-height: 1;
}
.stat-label {
  font-size: 13px;
  letter-spacing: 1.5px;
  color: var(--text-secondary);
  text-transform: uppercase;
  margin-top: 8px;
}

/* ── Footer ── */
.footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--gold-border);
  padding: 60px 5% 32px;
}
.footer-top {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr;
  gap: 60px;
  padding-bottom: 48px;
  border-bottom: 1px solid rgba(255,255,255,0.05);
}
.footer-brand-desc {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-top: 16px;
  max-width: 300px;
}
.footer-heading {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 20px;
}
.footer-links { list-style: none; }
.footer-links li { margin-bottom: 12px; }
.footer-links a {
  font-size: 14px;
  color: var(--text-secondary);
  transition: color var(--transition);
}
.footer-links a:hover { color: var(--gold); }
.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 28px;
  font-size: 13px;
  color: var(--text-muted);
}

/* ── Page Hero (inner pages) ── */
.page-hero {
  padding: 160px 5% 80px;
  background: linear-gradient(180deg, rgba(201,161,69,0.04) 0%, transparent 100%);
  border-bottom: 1px solid var(--gold-border);
  text-align: center;
}

/* ── Grid Layouts ── */
.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}
.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
}

/* ── Animated Background Mesh ── */
.hero-bg {
  position: absolute;
  inset: 0;
  overflow: hidden;
  pointer-events: none;
}
.hero-bg::before {
  content: '';
  position: absolute;
  width: 600px; height: 600px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(201,161,69,0.06) 0%, transparent 70%);
  top: -200px; right: -100px;
  animation: pulse 8s ease-in-out infinite;
}
.hero-bg::after {
  content: '';
  position: absolute;
  width: 400px; height: 400px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(10,60,120,0.15) 0%, transparent 70%);
  bottom: 0; left: 10%;
  animation: pulse 10s ease-in-out infinite reverse;
}
@keyframes pulse {
  0%,100% { transform: scale(1); opacity: 1; }
  50%      { transform: scale(1.15); opacity: 0.7; }
}

/* ── Fade-in animation ── */
.fade-up {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.fade-up.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ── Mobile hamburger button ── */
.mobile-menu-btn {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  margin-left: auto;
  flex-shrink: 0;
}
.mobile-menu-btn span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--gold);
  border-radius: 2px;
  transition: all 0.3s ease;
  transform-origin: center;
}
.mobile-menu-btn.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.mobile-menu-btn.open span:nth-child(2) { opacity: 0; }
.mobile-menu-btn.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ── Responsive ── */
@media (max-width: 900px) {
  .grid-3 { grid-template-columns: 1fr; }
  .grid-2 { grid-template-columns: 1fr; }
  .footer-top { grid-template-columns: 1fr; gap: 36px; }

  .mobile-menu-btn { display: flex; }

  .nav-links {
    display: none;
    position: fixed;
    top: var(--nav-height);
    left: 0; right: 0;
    background: rgba(4,8,15,0.97);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    flex-direction: column;
    align-items: center;
    gap: 0;
    padding: 12px 0 24px;
    border-bottom: 1px solid var(--gold-border);
    z-index: 999;
    list-style: none;
  }
  .nav-links.open { display: flex; }
  .nav-links li { width: 100%; text-align: center; }
  .nav-links li a {
    display: block;
    padding: 14px 24px;
    font-size: 13px;
    letter-spacing: 2px;
  }
  .nav-links li a.nav-cta {
    margin: 12px 24px 0;
    display: block;
    width: calc(100% - 48px);
    text-align: center;
  }
}
@media (max-width: 600px) {
  .section { padding: 70px 6%; }
  .card { padding: 28px; }
  .footer-bottom { flex-direction: column; gap: 12px; text-align: center; }
}

/* ── Scrollbar ── */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-primary); }
::-webkit-scrollbar-thumb { background: var(--gold-border); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--gold); }