/* ============================================
   GKHT Exotics — Global Styles
   ============================================ */

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

/* ---- Reset & Base ---- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --black:   #0a0a0a;
  --white:   #f5f5f5;
  --gray-1:  #1a1a1a;
  --gray-2:  #2a2a2a;
  --gray-3:  #555555;
  --gray-4:  #888888;
  --gray-5:  #bbbbbb;
  --accent:  #ffffff;
  --font-sans: 'Space Grotesk', sans-serif;
  --font-mono: 'Space Mono', monospace;
  --nav-h:   80px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

html {
  scroll-behavior: smooth;
}

body {
  background-color: var(--black);
  color: var(--white);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

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

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

ul, ol {
  list-style: none;
}

/* ---- Typography ---- */
h1, h2, h3, h4 {
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.1;
}

h1 { font-size: clamp(2.5rem, 6vw, 5rem); }
h2 { font-size: clamp(1.8rem, 4vw, 3rem); }
h3 { font-size: clamp(1.2rem, 2.5vw, 1.8rem); }

.label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--gray-4);
}

/* ---- Layout ---- */
.container {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 40px;
}

section {
  padding: 100px 0;
}

/* ============================================
   NAVIGATION
   ============================================ */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-h);
  z-index: 1000;
  transition: background var(--transition), border-color var(--transition);
  border-bottom: 1px solid transparent;
}

.nav.scrolled {
  background: rgba(10, 10, 10, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-color: var(--gray-2);
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.nav__logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-mono);
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--white);
  transition: opacity var(--transition);
}

.nav__logo:hover { opacity: 0.7; }

.nav__logo-img {
  height: 38px;
  width: 38px;
  display: block;
  flex-shrink: 0;
}

.nav__links {
  display: flex;
  align-items: center;
  gap: 40px;
}

.nav__link {
  font-size: 0.85rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--gray-5);
  transition: color var(--transition);
  position: relative;
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--white);
  transition: width var(--transition);
}

.nav__link:hover,
.nav__link.active {
  color: var(--white);
}

.nav__link:hover::after,
.nav__link.active::after {
  width: 100%;
}

.nav__cta {
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 10px 24px;
  border: 1px solid var(--white);
  color: var(--white);
  background: transparent;
  transition: background var(--transition), color var(--transition);
  cursor: pointer;
}

.nav__cta:hover {
  background: var(--white);
  color: var(--black);
}

/* Mobile menu */
.nav__hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
  background: none;
  border: none;
}

.nav__hamburger span {
  display: block;
  width: 24px;
  height: 1.5px;
  background: var(--white);
  transition: transform var(--transition), opacity var(--transition);
}

.nav__hamburger.open span:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
.nav__hamburger.open span:nth-child(2) { opacity: 0; }
.nav__hamburger.open span:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }

.nav__mobile {
  display: none;
  position: fixed;
  inset: 0;
  top: var(--nav-h);
  background: var(--black);
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 32px;
  z-index: 999;
}

.nav__mobile.open {
  display: flex;
}

.nav__mobile .nav__link {
  font-size: 1.4rem;
  letter-spacing: 0.12em;
}

/* ============================================
   BUTTONS
   ============================================ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-sans);
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 14px 32px;
  cursor: pointer;
  transition: all var(--transition);
  border: none;
  outline: none;
}

.btn--primary {
  background: var(--white);
  color: var(--black);
}

.btn--primary:hover {
  background: var(--gray-5);
}

.btn--outline {
  background: transparent;
  color: var(--white);
  border: 1px solid var(--white);
}

.btn--outline:hover {
  background: var(--white);
  color: var(--black);
}

.btn--ghost {
  background: transparent;
  color: var(--gray-5);
  padding: 0;
  letter-spacing: 0.1em;
}

.btn--ghost:hover {
  color: var(--white);
}

.btn svg {
  flex-shrink: 0;
}

/* ============================================
   DIVIDER LINE
   ============================================ */
.divider {
  width: 100%;
  height: 1px;
  background: var(--gray-2);
}

/* ============================================
   PAGE HERO (inner pages)
   ============================================ */
.page-hero {
  padding: calc(var(--nav-h) + 80px) 0 80px;
  border-bottom: 1px solid var(--gray-2);
}

.page-hero .label {
  margin-bottom: 20px;
}

/* ============================================
   FOOTER
   ============================================ */
.footer {
  border-top: 1px solid var(--gray-2);
  padding: 60px 0 40px;
}

.footer__grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 60px;
}

.footer__brand p {
  color: var(--gray-4);
  font-size: 0.9rem;
  line-height: 1.7;
  margin-top: 16px;
  max-width: 280px;
}

.footer__logo {
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.footer__col h4 {
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--gray-4);
  margin-bottom: 20px;
  font-family: var(--font-mono);
}

.footer__col ul {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer__col ul li a {
  font-size: 0.9rem;
  color: var(--gray-5);
  transition: color var(--transition);
}

.footer__col ul li a:hover {
  color: var(--white);
}

.footer__bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 30px;
  border-top: 1px solid var(--gray-2);
}

.footer__bottom p {
  font-size: 0.8rem;
  color: var(--gray-3);
}

/* ============================================
   SCROLL FADE-IN ANIMATION
   ============================================ */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

.fade-in-delay-1 { transition-delay: 0.1s; }
.fade-in-delay-2 { transition-delay: 0.2s; }
.fade-in-delay-3 { transition-delay: 0.3s; }
.fade-in-delay-4 { transition-delay: 0.4s; }

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 1024px) {
  .container { padding: 0 28px; }
  .footer__grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  :root { --nav-h: 64px; }
  section { padding: 70px 0; }
  .container { padding: 0 20px; }

  .nav__links,
  .nav__cta {
    display: none;
  }

  .nav__hamburger {
    display: flex;
  }

  .footer__grid { grid-template-columns: 1fr; }
  .footer__bottom { flex-direction: column; gap: 12px; text-align: center; }
}