/* ── Variables CSS ── */
:root {
  --c-bg: #F6F6F4;
  --c-surface: #EDEDE9;
  --c-border: #DDDDD9;
  --c-heading: #0A0A0A;
  --c-text: #1C1C1A;
  --c-muted: #717170;
  --c-faint: #B0B0AE;
}

.dark {
  --c-bg: #0F0F0F;
  --c-surface: #161616;
  --c-border: #232323;
  --c-heading: #FFFFFF;
  --c-text: #F2F2F0;
  --c-muted: #888884;
  --c-faint: #444440;
}

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

html { scroll-behavior: smooth; }

body {
  background-color: var(--c-bg);
  color: var(--c-text);
  font-family: 'Inter', sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color 0.3s ease, color 0.3s ease;
  margin: 0;
}

h1, h2, h3, h4, h5, h6 {
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 600;
  color: var(--c-heading);
}

::selection { background-color: #6DC98A; color: #0A0A0A; }

/* ── Utilities ── */
.eyebrow {
  font-family: 'Inter', sans-serif;
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--c-muted);
}

/* ── Marquee ── */
@keyframes marquee {
  from { transform: translateX(0); }
  to   { transform: translateX(-50%); }
}
.animate-marquee { animation: marquee 40s linear infinite; }

/* ── Scroll indicator ── */
@keyframes bounce-line {
  0%, 100% { transform: translateY(0); }
  50%       { transform: translateY(8px); }
}
.scroll-indicator {
  width: 1px;
  height: 48px;
  background: linear-gradient(to bottom, transparent, var(--c-muted));
  animation: bounce-line 2s ease-in-out infinite;
}

/* ── Fade animations (Intersection Observer) ── */
.fade-up {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.65s cubic-bezier(0.22,1,0.36,1), transform 0.65s cubic-bezier(0.22,1,0.36,1);
}
.fade-in {
  opacity: 0;
  transition: opacity 0.7s ease-out;
}
.fade-up.visible { opacity: 1; transform: translateY(0); }
.fade-in.visible { opacity: 1; }

.fade-up[data-delay="1"] { transition-delay: 0.1s; }
.fade-up[data-delay="2"] { transition-delay: 0.2s; }
.fade-up[data-delay="3"] { transition-delay: 0.3s; }
.fade-in[data-delay="1"] { transition-delay: 0.1s; }
.fade-in[data-delay="2"] { transition-delay: 0.15s; }

/* ── Navbar ── */
header { transition: background-color 0.5s ease, border-color 0.5s ease, backdrop-filter 0.5s ease; }

header.scrolled-dark {
  background-color: rgba(15,15,15,0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--c-border);
}
header.scrolled-light {
  background-color: rgba(246,246,244,0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--c-border);
}

/* ── Nav dropdown ── */
.nav-dropdown {
  opacity: 0;
  transform: translateY(-4px);
  pointer-events: none;
  transition: opacity 0.2s ease, transform 0.2s ease;
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%) translateY(-4px);
}
.nav-dropdown.open {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
  pointer-events: auto;
}
.expertises-nav:hover .nav-dropdown { opacity: 1; transform: translateX(-50%) translateY(0); pointer-events: auto; }

/* ── Mobile menu ── */
#mobile-menu { display: none; }
#mobile-menu.open { display: block; }
#mobile-expertises-sub { display: none; }
#mobile-expertises-sub.open { display: flex; }
.mobile-chevron { transition: transform 0.2s ease; }
.mobile-chevron.rotated { transform: rotate(180deg); }

/* ── Logo theme switching ── */
.logo-dark  { display: none; }
.logo-light { display: block; }
.dark .logo-dark  { display: block; }
.dark .logo-light { display: none; }

/* ── Theme icon switching ── */
.icon-sun  { display: none; }
.icon-moon { display: block; }
.dark .icon-sun  { display: block; }
.dark .icon-moon { display: none; }

/* ── Hero overlay (theme-aware) ── */
.hero-overlay {
  background: linear-gradient(to bottom, rgba(246,246,244,0.8), rgba(246,246,244,0.65), rgba(246,246,244,1));
}
.dark .hero-overlay {
  background: linear-gradient(to bottom, rgba(15,15,15,0.6), rgba(15,15,15,0.45), rgba(15,15,15,0.8));
}
.hero-overlay-full {
  background: linear-gradient(to bottom, rgba(246,246,244,0.7), rgba(246,246,244,0.55), rgba(246,246,244,1));
}
.dark .hero-overlay-full {
  background: linear-gradient(to bottom, rgba(15,15,15,0.6), rgba(15,15,15,0.5), rgba(15,15,15,1));
}

/* ── Navbar dropdown bg (theme-aware) ── */
.dropdown-panel-dark  { display: none; }
.dropdown-panel-light { display: block; }
.dark .dropdown-panel-dark  { display: block; }
.dark .dropdown-panel-light { display: none; }

/* ── FAQ ── */
.faq-answer {
  overflow: hidden;
  max-height: 0;
  transition: max-height 0.35s cubic-bezier(0.22,1,0.36,1);
}
.faq-answer.open { max-height: 600px; }
.faq-chevron { transition: transform 0.3s ease; display: flex; }
.faq-item.open .faq-chevron { transform: rotate(180deg); }

/* ── Testimonials slider ── */
.testimonial-slide { display: none; }
.testimonial-slide.active { display: flex; }
.testimonial-dot {
  width: 8px;
  height: 8px;
  border-radius: 9999px;
  background: var(--c-border);
  transition: all 0.3s;
  border: none;
  cursor: pointer;
  padding: 0;
}
.testimonial-dot.active {
  background: #6DC98A;
  width: 24px;
}

/* ── Contact form ── */
.contact-success {
  border: 1px solid rgba(109,201,138,0.3);
  background-color: rgba(109,201,138,0.1);
}

/* ── Dropdown border subtle backgrounds ── */
.dropdown-item-active { background-color: rgba(180,180,175,0.3); }
.dropdown-item:hover  { background-color: rgba(180,180,175,0.2); }