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

/* ============================================
   RESET + BASE TYPE
   ============================================ */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scroll-padding-top: var(--header-height);
}

body {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  font-weight: 400;
  color: var(--text-primary);
  background: var(--bg-primary);
  overflow-x: hidden;
  transition: background var(--transition-base), color var(--transition-base);
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-fast);
}
a:hover {
  color: var(--text-primary);
}

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

h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: 400;
  line-height: var(--leading-headline);
  letter-spacing: var(--tracking-display);
  color: var(--text-primary);
}

/* Arkspan display scale — oversized, confident, firm weight */
h1 {
  font-size: var(--display-lg);
  font-weight: 600;
}
h2 {
  font-size: var(--display-md);
  font-weight: 600;
}
h3 {
  font-size: var(--display-sm);
  font-weight: 600;
}
h4 {
  font-size: var(--text-2xl);
  font-weight: 600;
}
h5 {
  font-size: var(--text-lg);
  font-weight: 600;
}

p {
  color: var(--text-secondary);
  line-height: var(--leading-relaxed);
  font-weight: 400;
}

strong {
  font-weight: 600;
}

code {
  font-family: var(--font-mono);
  font-size: 0.875em;
  background: var(--bg-tertiary);
  padding: 0.15em 0.4em;
}

::selection {
  background: var(--accent);
  color: #fff;
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

/* ============================================
   LAYOUT PRIMITIVES
   ============================================ */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 clamp(1.25rem, 4vw, 3rem);
}
.container--narrow {
  max-width: var(--max-width-narrow);
}
.container--wide {
  max-width: var(--max-width-wide);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

.divider {
  border: none;
  border-top: 1px solid var(--border-light);
  margin: var(--space-8) 0;
}

/* Eyebrow — Tesla's small uppercase label above headlines */
.eyebrow {
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: var(--tracking-nav);
  text-transform: uppercase;
  color: var(--accent);
  display: block;
  margin-bottom: var(--space-4);
}

/* Text link row — the signature Tesla CTA pattern */
.link-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3) var(--space-8);
  justify-content: center;
}
.link-row--start {
  justify-content: flex-start;
}
.link-row a {
  font-size: var(--text-base);
  color: var(--text-primary);
  position: relative;
  padding-bottom: 2px;
}
.link-row a::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 1px;
  background: currentColor;
  transform: scaleX(0);
  transform-origin: right;
  transition: transform var(--transition-base);
}
.link-row a:hover::after {
  transform: scaleX(1);
  transform-origin: left;
}

/* ============================================
   ANIMATION
   ============================================ */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(28px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}
@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}
@keyframes pulse {
  0%,
  100% {
    opacity: 1;
  }
  50% {
    opacity: 0.45;
  }
}
@keyframes scrollCue {
  0% {
    transform: translateY(0);
    opacity: 0;
  }
  35% {
    opacity: 1;
  }
  100% {
    transform: translateY(14px);
    opacity: 0;
  }
}

.page-enter {
  opacity: 0;
  transform: translateY(28px);
}
.page-enter.visible {
  opacity: 1;
  transform: translateY(0);
  transition: opacity 0.8s ease, transform 0.8s cubic-bezier(0.22, 1, 0.36, 1);
}
.page-enter-delay-1 {
  transition-delay: 0.08s !important;
}
.page-enter-delay-2 {
  transition-delay: 0.16s !important;
}
.page-enter-delay-3 {
  transition-delay: 0.24s !important;
}
.page-enter-delay-4 {
  transition-delay: 0.32s !important;
}

@media (prefers-reduced-motion: reduce) {
  .page-enter {
    opacity: 1;
    transform: none;
  }
}

@media (max-width: 1024px) {
  .container {
    padding: 0 var(--space-5);
  }
}
@media (max-width: 768px) {
  .container {
    padding: 0 var(--space-4);
  }
  .link-row {
    gap: var(--space-3) var(--space-6);
  }
}
@media (max-width: 480px) {
  .container {
    padding: 0 var(--space-3);
  }
  html {
    font-size: 15px;
  }
}