:root {
  --bg: #dcdcdc; /* off-white grey background */
  --dot: #b4b4b4; /* dot grid */
  --ink: #4a4a4a; /* dark grey: logo and submarine */
  --ink-hover: #2e2e2e; /* submarine on hover */
  --nav: #4b3fa6; /* ABOUT / CONTACT purple */
  --flag: #f0866a; /* news flag orange */
  --flag-ink: #a9435c; /* news flag text */
  --grid: 28px; /* dot grid spacing */
  --margin: clamp(24px, 4.7vw, 120px);
}

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

html,
body {
  height: 100%;
}

body {
  background-color: var(--bg);
  background-image: radial-gradient(circle, var(--dot) 1px, transparent 1.2px);
  background-size: var(--grid) var(--grid);
  background-position: calc(var(--grid) / 2) calc(var(--grid) / 2);
  color: var(--ink);
  font-family:
    "IBM Plex Mono", ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  padding: calc(var(--margin) * 0.85 + env(safe-area-inset-top, 0px))
    var(--margin) 0;
}

/* Logo: the SVG inherits its colour from --ink */
.logo {
  display: block;
  position: relative;
  width: clamp(200px, 34vw, 880px);
  color: var(--ink);
  text-decoration: none;
}
.logo svg {
  display: block;
  width: 100%;
  height: auto;
  fill: currentColor;
}

.tm {
  position: absolute;
  top: -0.15em;
  left: calc(100% + 0.6em);
  font-size: clamp(10px, 1.1vw, 28px);
  line-height: 1;
  color: var(--ink);
}

.nav {
  display: flex;
  gap: clamp(20px, 2vw, 52px);
  padding-top: 0.2em;
}

.nav a {
  font-family: inherit;
  font-weight: 400;
  font-size: clamp(16px, 1.55vw, 40px);
  letter-spacing: 0.02em;
  color: var(--nav);
  text-decoration: none;
}
.nav a:hover {
  text-decoration: underline;
  text-underline-offset: 0.2em;
}
.nav a:focus-visible {
  outline: 2px solid var(--nav);
  outline-offset: 4px;
}

.stage {
  flex: 1;
  position: relative;
  min-height: 320px;
}

/* Submarine: sized relative to the viewport, as in the design.
      Its position is driven by the script (it wanders around on its own). */
.sub {
  --sw: clamp(140px, 15.2vw, 400px); /* submarine width */
  --mx: 25%; /* mast position (at the conning tower) */
  position: absolute;
  left: 0;
  top: 0;
  width: var(--sw);
  color: var(--ink);
  will-change: transform;
}

.hull {
  display: block;
  width: 100%;
  padding: 0;
  border: 0;
  background: none;
  color: inherit;
  cursor: pointer;
  transform-origin: 50% 60%;
}
.hull {
  position: relative;
}
.hull svg {
  display: block;
  width: 100%;
  height: auto;
  fill: currentColor;
}

.hull svg {
  transition: fill 0.2s;
}
/* Darkens slightly on hover to show it is clickable */
@media (hover: hover) {
  .hull:hover svg {
    fill: var(--ink-hover);
  }
}
.hull:focus-visible svg {
  fill: var(--ink-hover);
}
.hull:focus-visible {
  outline: 2px solid var(--nav);
  outline-offset: 6px;
  border-radius: 8px;
}

/* Mast and news flag */
.mast {
  position: absolute;
  left: calc(var(--mx) - var(--sw) * 0.015);
  bottom: calc(100% + var(--sw) * 0.07);
  width: calc(var(--sw) * 0.03);
  height: calc(var(--sw) * 0.74);
  border-radius: 999px;
  background: var(--flag);
  transform: scaleY(0);
  transform-origin: 50% 100%;
  transition: transform 0.35s cubic-bezier(0.3, 0.7, 0.3, 1) 0.15s;
}

.flag {
  position: absolute;
  left: calc(var(--mx) + var(--sw) * 0.055);
  --fh: calc(var(--sw) * 0.4); /* flag height */
  --fr: calc(var(--sw) * 0.11); /* corner radius */
  bottom: calc(100% + var(--sw) * 0.07 + var(--sw) * 0.74 - var(--fh));
  width: calc(var(--sw) * 1.35);
  height: var(--fh);
  padding: 0 calc(var(--sw) * 0.115);
  display: flex;
  flex-direction: column;
  justify-content: center;
  border-radius: var(--fr);
  background: var(--flag);
  color: var(--flag-ink);
  font-size: calc(var(--sw) * 0.1);
  line-height: 1.05;
  letter-spacing: 0.02em;
  text-decoration: none;
  white-space: nowrap;
  overflow: hidden;
  /* Open: revealed outwards from the mast. Text is never scaled. */
  clip-path: inset(0 100% 0 0 round var(--fr));
  opacity: 0;
  transition: none;
}
.flag span {
  opacity: 0;
  transform: translateY(0.25em);
  transition:
    opacity 0.2s,
    transform 0.2s;
}
.flag:hover {
  filter: brightness(1.04);
}
.flag:focus-visible {
  outline: 2px solid var(--nav);
  outline-offset: 4px;
}

.sub.flag-left .flag {
  left: auto;
  right: calc(100% - var(--mx) + var(--sw) * 0.055);
  clip-path: inset(0 0 0 100% round var(--fr));
}

.sub.open .mast {
  transform: scaleY(1);
  transition-delay: 0s;
}
.sub.open .flag {
  clip-path: inset(0 0 0 0 round var(--fr));
  opacity: 1;
  transition: clip-path 0.4s cubic-bezier(0.3, 0.7, 0.3, 1) 0.3s;
}
.sub.open .flag span {
  opacity: 1;
  transform: none;
  transition:
    opacity 0.3s 0.6s,
    transform 0.3s 0.6s;
}
.sub.open .flag span + span {
  transition-delay: 0.7s;
}

/* Close: text fades first, then the flag really shrinks (width) towards
      the mast, so its rounded corners are kept the whole time. */
.sub.open.closing .flag {
  width: var(--fh);
  opacity: 0;
  transition:
    width 0.3s cubic-bezier(0.6, 0, 0.4, 1) 0.1s,
    opacity 0.18s ease-in 0.27s;
}
.sub.open.closing .flag span {
  opacity: 0;
  transform: none;
  transition: opacity 0.12s;
}

.ping {
  position: fixed;
  width: 64px;
  height: 64px;
  margin: -32px 0 0 -32px;
  border: 1.5px solid var(--ink);
  border-radius: 50%;
  pointer-events: none;
  animation: ping 0.9s cubic-bezier(0.2, 0.7, 0.3, 1) forwards;
}
@keyframes ping {
  from {
    transform: scale(0.1);
    opacity: 0.7;
  }
  to {
    transform: scale(1);
    opacity: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .mast,
  .flag,
  .flag span {
    transition-duration: 0.01s !important;
    transition-delay: 0s !important;
  }
}

.footer {
  margin-top: auto;
  padding: 0 var(--margin)
    calc(var(--margin) * 0.45 + env(safe-area-inset-bottom, 0px));
  font-size: clamp(11px, 0.95vw, 24px);
  letter-spacing: 0.04em;
  color: #5a5a5a;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: baseline;
  gap: 0.6em 2em;
}
.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.3em 2em;
}
.footer a {
  color: inherit;
  text-decoration: none;
  text-underline-offset: 0.2em;
}
.footer a:hover {
  color: var(--ink);
  text-decoration: underline;
}
.footer a:focus-visible {
  outline: 2px solid var(--nav);
  outline-offset: 3px;
}

@media (max-width: 600px) {
  .header {
    flex-direction: column;
    gap: 20px;
  }
  .logo {
    width: min(78vw, 360px);
  }
}

.text-content {

  padding: 0 20px;
}