*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --paper: #f6f5f2;
  --paper-rgb: 246, 245, 242;
  --ink: #0e0e0d;
  --muted: #94908a;
  --faint: #c8c5be;
  --line: rgba(14, 14, 13, 0.07);
  --surface: rgba(255, 255, 255, 0.35);
  --logo-filter: none;

  --gutter: clamp(1.5rem, 5vw, 3rem);
  --max: 1200px;
  --media-radius: clamp(1.5rem, 4vw, 3.75rem);

  --space-xs: clamp(0.75rem, 1.5vw, 1rem);
  --space-sm: clamp(1.5rem, 3vw, 2rem);
  --space-md: clamp(3rem, 6vw, 5rem);
  --space-lg: clamp(6rem, 12vw, 10rem);
  --space-xl: clamp(10rem, 20vw, 16rem);

  --type-kicker: 0.625rem;
  --type-note: 0.875rem;
  --type-body: clamp(1rem, 1.4vw, 1.125rem);
  --type-principle: clamp(1.125rem, 1.8vw, 1.375rem);
  --type-statement: clamp(2rem, 5.5vw, 4.5rem);

  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --duration: 0.7s;

  --chrome-fade-height: clamp(8.25rem, 17vh, 11.5rem);
}

:root[data-theme="dark"] {
  --paper: #0d0d0c;
  --paper-rgb: 13, 13, 12;
  --ink: #f4f3f0;
  --muted: #807c76;
  --faint: #2b2a27;
  --line: rgba(244, 243, 240, 0.09);
  --surface: rgba(255, 255, 255, 0.035);
  --logo-filter: invert(1) brightness(1.08);
}

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scroll-behavior: smooth;
  background: var(--paper);
}

body {
  font-family: "Inter", system-ui, sans-serif;
  font-weight: 300;
  background: var(--paper);
  color: var(--ink);
  line-height: 1.5;
  overflow-x: hidden;
  transition: background-color 0.4s var(--ease), color 0.4s var(--ease);
}

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

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

a:focus-visible,
.skip-link:focus-visible {
  outline: 1px solid var(--ink);
  outline-offset: 3px;
}

.skip-link {
  position: absolute;
  top: -100%;
  left: var(--gutter);
  z-index: 200;
  padding: 0.5rem 0.75rem;
  background: var(--ink);
  color: var(--paper);
  font-family: "IBM Plex Mono", monospace;
  font-size: var(--type-kicker);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.skip-link:focus {
  top: var(--gutter);
}

.mono {
  font-family: "IBM Plex Mono", monospace;
  font-size: var(--type-kicker);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.copy-kicker {
  font-family: "IBM Plex Mono", monospace;
  font-size: var(--type-kicker);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
}

.copy-statement {
  font-size: var(--type-statement);
  font-weight: 300;
  letter-spacing: -0.04em;
  line-height: 0.95;
}

.copy-note {
  font-size: var(--type-note);
  color: var(--muted);
  line-height: 1.65;
  max-width: 30ch;
}

.copy-body {
  font-size: var(--type-body);
  line-height: 1.6;
  max-width: 58ch;
}

.placeholder {
  color: var(--muted);
  border-bottom: 1px dashed var(--faint);
}

/* Header */
.site-header {
  --header-pad-y: clamp(0.875rem, 2vw, 1.25rem);
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 101;
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
  padding: var(--header-pad-y) var(--gutter);
  pointer-events: none;
}

.page-home .site-header:not(.is-open) {
  background: transparent;
}

.site-header > * {
  pointer-events: auto;
}

.site-header__logo {
  display: block;
  line-height: 0;
  opacity: var(--header-opacity, 1);
  transition: opacity 0.4s var(--ease);
}

.page-home .site-header__logo,
.page-home .site-header__nav {
  opacity: var(--header-opacity, 0);
}

.site-header__wordmark {
  height: 0.75rem;
  width: auto;
  filter: var(--logo-filter);
}

.site-header__right {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.site-header__nav {
  display: flex;
  gap: 1.25rem;
  color: var(--muted);
  transition: opacity 0.4s var(--ease);
}

.site-header__theme {
  appearance: none;
  background: none;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--muted);
  cursor: pointer;
  width: 2rem;
  height: 2rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  line-height: 0;
  transition: color 0.3s var(--ease), border-color 0.3s var(--ease);
}

.site-header__theme:hover {
  color: var(--ink);
  border-color: var(--muted);
}

.site-header__theme svg {
  width: 0.95rem;
  height: 0.95rem;
}

.site-header__theme .icon-sun { display: none; }
:root[data-theme="dark"] .site-header__theme .icon-moon { display: none; }
:root[data-theme="dark"] .site-header__theme .icon-sun { display: block; }

.site-header__nav a:hover {
  color: var(--ink);
}

.site-header__nav a.is-active {
  color: var(--ink);
}

.top-chrome-fade {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 99;
  height: var(--chrome-fade-height);
  pointer-events: none;
  background: linear-gradient(
    to bottom,
    rgba(var(--paper-rgb), 0.94) 0%,
    rgba(var(--paper-rgb), 0.78) 28%,
    rgba(var(--paper-rgb), 0.48) 55%,
    rgba(var(--paper-rgb), 0.16) 78%,
    rgba(var(--paper-rgb), 0) 100%
  );
}

.page-home .top-chrome-fade {
  opacity: var(--chrome-fade-opacity, 0);
  transition: opacity 0.4s var(--ease);
}

body.menu-open .top-chrome-fade {
  opacity: 0;
}

.site-header__menu {
  display: none;
  appearance: none;
  background: none;
  border: 0;
  color: var(--muted);
  cursor: pointer;
  padding: 0;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  transition: color 0.3s var(--ease);
}

.site-header__menu:hover {
  color: var(--ink);
}

body.menu-open {
  overflow: hidden;
}

@media (max-width: 768px) {
  .site-header {
    --header-pad-y: 0.875rem;
    padding: var(--header-pad-y) 1.5rem;
  }

  .site-header__wordmark {
    height: 0.625rem;
  }

  .site-header__right {
    gap: 1rem;
  }

  .site-header__menu {
    display: inline-flex;
    align-items: center;
  }

  .site-header.is-open {
    background: var(--paper);
  }

  .site-header__logo,
  .site-header__theme,
  .site-header__menu {
    position: relative;
    z-index: 2;
  }

  .site-header__nav {
    display: none;
    position: fixed;
    inset: 0;
    z-index: 1;
    flex-direction: column;
    justify-content: center;
    align-items: flex-start;
    gap: 1.75rem;
    padding:
      calc(var(--header-pad-y) * 2 + 0.625rem + 2rem)
      1.5rem
      var(--gutter);
    background: var(--paper);
    pointer-events: none;
  }

  .site-header__nav a {
    position: relative;
    z-index: 1;
    font-size: var(--type-note);
    color: var(--ink);
  }

  .site-header.is-open .site-header__nav,
  .page-home .site-header.is-open .site-header__nav {
    display: flex;
    pointer-events: none;
    opacity: 1;
  }

  .site-header.is-open .site-header__nav a,
  .page-home .site-header.is-open .site-header__nav a {
    pointer-events: auto;
  }

  .page-home .site-header__logo {
    opacity: 1;
  }
}

/* Footer */
.site-footer {
  padding: var(--space-sm) var(--gutter) var(--gutter);
  max-width: calc(var(--max) + var(--gutter) * 2);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  color: var(--muted);
  border-top: 1px solid var(--line);
}

.site-footer__wordmark {
  height: 0.625rem;
  width: auto;
  opacity: 0.55;
  filter: var(--logo-filter);
}

/* Images sit above the top chrome fade; typography stays below it. */
.chrome-fade-exempt,
.opening__media .media-frame,
.media-frame {
  position: relative;
  z-index: 100;
}

.page-atmosphere__hero .page-atmosphere__img.chrome-fade-exempt {
  position: absolute;
}

/* Media */
.media-frame {
  overflow: hidden;
  position: relative;
  background: var(--faint);
  border-radius: var(--media-radius);
}

.media-frame img,
.media-frame video {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* Reveal */
.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition:
    opacity var(--duration) var(--ease),
    transform var(--duration) var(--ease);
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.reveal[data-delay="1"] { transition-delay: 0.08s; }
.reveal[data-delay="2"] { transition-delay: 0.16s; }
.reveal[data-delay="3"] { transition-delay: 0.24s; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  .reveal,
  .reveal[data-delay] {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .page-home .site-header__logo,
  .page-home .site-header__nav {
    opacity: 1;
  }
}