/* Topcoat: a rainy night in a Victorian workshop. */

:root {
  color-scheme: dark;

  --night: #0b0e12;
  --soot: #12161b;
  --iron: #1d232a;
  --iron-hi: #2c343d;
  --brass: #c9a24a;
  --brass-hi: #f1d58a;
  --brass-lo: #7c5a22;
  --copper: #b4643a;
  --verdigris: #6fb3a3;
  --gaslight: #ffcf7a;
  --parchment: #efe3c8;
  --parchment-lo: #d9c8a3;
  --ink: #2a1f14;
  --text: #e6dcc4;
  --text-dim: #a99f8a;

  --display: "Cinzel Decorative", "Cinzel", Georgia, serif;
  --body: "IM Fell English", Georgia, "Times New Roman", serif;
  --mono: "JetBrains Mono", ui-monospace, Menlo, monospace;

  --gutter: clamp(16px, 4vw, 48px);
  --measure: 72rem;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(ellipse 80% 50% at 50% 0%, #1b2430 0%, transparent 70%),
    linear-gradient(180deg, #121821 0%, var(--night) 40%, #07090c 100%);
  background-attachment: fixed;
  color: var(--text);
  font-family: var(--body);
  font-size: 1.15rem;
  line-height: 1.6;
  overflow-x: hidden;
}

a {
  color: var(--brass-hi);
  text-decoration-color: color-mix(in srgb, var(--brass) 60%, transparent);
  text-underline-offset: 0.2em;
}

a:hover {
  color: var(--gaslight);
}

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

code {
  font-family: var(--mono);
  font-size: 0.85em;
  background: color-mix(in srgb, var(--iron-hi) 70%, transparent);
  border: 1px solid color-mix(in srgb, var(--brass) 25%, transparent);
  border-radius: 3px;
  padding: 0.05em 0.35em;
}

[hidden] {
  display: none !important;
}

/* --- Weather -------------------------------------------------------------- */

#rain {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 5;
}

#lightning {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 4;
  background: radial-gradient(ellipse at 30% 0%, rgba(220, 230, 255, 0.55), rgba(180, 200, 255, 0.08) 70%);
  opacity: 0;
}

#lightning.strike {
  animation: strike 1.1s ease-out;
}

@keyframes strike {
  0% { opacity: 0; }
  4% { opacity: 0.9; }
  9% { opacity: 0.1; }
  13% { opacity: 0.7; }
  100% { opacity: 0; }
}

.fog {
  position: fixed;
  inset: auto 0 0 0;
  height: 45vh;
  pointer-events: none;
  z-index: 3;
  background:
    radial-gradient(ellipse 60% 40% at 20% 100%, rgba(150, 165, 180, 0.12), transparent 70%),
    radial-gradient(ellipse 50% 35% at 80% 100%, rgba(150, 165, 180, 0.1), transparent 70%);
  animation: drift 40s ease-in-out infinite alternate;
}

@keyframes drift {
  from { transform: translateX(-4%); }
  to { transform: translateX(4%); }
}

#weather {
  position: relative;
  z-index: 1;
}

#weather[data-rain="0"] ~ .fog,
#weather[data-rain="0"] .lamp-glow {
  opacity: 0.6;
}

/* --- Header --------------------------------------------------------------- */

.site-header {
  position: relative;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  max-width: var(--measure);
  margin: 0 auto;
  padding: 1.25rem var(--gutter);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  color: var(--brass-hi);
  text-decoration: none;
  font-family: var(--display);
  font-weight: 700;
  font-size: 1.4rem;
  letter-spacing: 0.06em;
}

.site-nav {
  display: flex;
  gap: clamp(0.75rem, 2.5vw, 2rem);
  flex-wrap: wrap;
}

.site-nav a {
  color: var(--text);
  text-decoration: none;
  font-variant: small-caps;
  letter-spacing: 0.08em;
  font-size: 1.1rem;
  border-bottom: 1px solid transparent;
}

.site-nav a:hover {
  color: var(--brass-hi);
  border-bottom-color: var(--brass);
}

/* --- Hero ----------------------------------------------------------------- */

.hero {
  position: relative;
  min-height: min(92vh, 900px);
  display: grid;
  align-items: center;
  padding: 3rem var(--gutter) 14rem;
  overflow: hidden;
  isolation: isolate;
}

.hero-copy {
  position: relative;
  z-index: 6;
  max-width: 44rem;
  margin-left: max(0px, calc((100vw - var(--measure)) / 2));
}

.eyebrow {
  margin: 0 0 1rem;
  color: var(--verdigris);
  font-variant: small-caps;
  letter-spacing: 0.2em;
  font-size: 1rem;
}

h1 {
  margin: 0;
  font-family: var(--display);
  font-weight: 700;
  line-height: 0.95;
}

.title-small {
  display: block;
  font-family: var(--body);
  text-transform: uppercase;
  font-size: clamp(1.1rem, 2.5vw, 1.6rem);
  font-weight: 400;
  letter-spacing: 0.4em;
  color: var(--text-dim);
}

.title-main {
  display: block;
  margin: 0.15em 0;
  font-size: clamp(3.4rem, 12vw, 8rem);
  letter-spacing: 0.02em;
  background: linear-gradient(180deg, var(--brass-hi) 0%, var(--brass) 45%, var(--brass-lo) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  filter: drop-shadow(0 2px 0 #3b2810) drop-shadow(0 0 24px rgba(255, 207, 122, 0.18));
}

.tagline {
  margin: 1.25rem 0 0.5rem;
  font-size: clamp(1.4rem, 3vw, 1.9rem);
  font-style: italic;
  color: var(--parchment);
}

.lede {
  margin: 0;
  max-width: 36rem;
  color: var(--text-dim);
}

.hero-actions {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  margin-top: 2rem;
}

.button {
  display: inline-block;
  padding: 0.7rem 1.6rem;
  border-radius: 4px;
  font-family: var(--display);
  font-weight: 700;
  font-size: 1rem;
  letter-spacing: 0.08em;
  text-decoration: none;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.button:hover {
  transform: translateY(-1px);
}

.button-brass {
  color: var(--ink);
  background: linear-gradient(180deg, var(--brass-hi), var(--brass) 55%, var(--brass-lo));
  border: 1px solid #3b2810;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.45), 0 4px 14px rgba(201, 162, 74, 0.25);
}

.button-brass:hover {
  color: var(--ink);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.45), 0 6px 22px rgba(255, 207, 122, 0.4);
}

.button-iron {
  color: var(--brass-hi);
  background: linear-gradient(180deg, var(--iron-hi), var(--iron));
  border: 1px solid var(--brass-lo);
}

/* The weather dial. */

.weather-control {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
  margin-top: 2.5rem;
}

.barometer {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  padding: 0.3rem 0.4rem 0.3rem 0.5rem;
  border-radius: 999px;
  background: linear-gradient(180deg, #2a2219, #15110c);
  border: 1px solid var(--brass-lo);
  box-shadow: inset 0 1px 0 rgba(241, 213, 138, 0.2), 0 2px 10px rgba(0, 0, 0, 0.5);
}

.barometer-gear {
  animation: spin 14s linear infinite;
  margin-right: 0.25rem;
}

.barometer-setting {
  font: inherit;
  font-variant: small-caps;
  letter-spacing: 0.08em;
  font-size: 1rem;
  color: var(--text-dim);
  background: transparent;
  border: 1px solid transparent;
  border-radius: 999px;
  padding: 0.3rem 0.9rem;
  cursor: pointer;
}

.barometer-setting:hover {
  color: var(--brass-hi);
}

.barometer-setting[aria-pressed="true"] {
  color: var(--ink);
  background: linear-gradient(180deg, var(--brass-hi), var(--brass));
  border-color: #3b2810;
}

.weather-note {
  margin: 0;
  max-width: 19rem;
  font-size: 0.95rem;
  font-style: italic;
  color: var(--text-dim);
}

/* Scenery. */

.gear {
  position: absolute;
  z-index: 1;
  opacity: 0.22;
  pointer-events: none;
}

.gear-a {
  width: 420px;
  top: -120px;
  right: -90px;
  animation: spin 90s linear infinite;
}

.gear-b {
  width: 240px;
  top: 220px;
  right: 230px;
  animation: spin 54s linear infinite reverse;
}

.gear-c {
  width: 160px;
  bottom: 140px;
  left: -50px;
  opacity: 0.14;
  animation: spin 40s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.airship {
  position: absolute;
  z-index: 1;
  top: 12%;
  width: 200px;
  opacity: 0.75;
  animation: sail 120s linear infinite;
}

@keyframes sail {
  from { left: -240px; transform: translateY(0); }
  50% { transform: translateY(18px); }
  to { left: 110%; transform: translateY(0); }
}

.lamp {
  position: absolute;
  z-index: 4;
  right: clamp(1rem, 10vw, 12rem);
  bottom: 40px;
  width: 110px;
}

.lamp img {
  position: relative;
  display: block;
  width: 100%;
}

.lamp-glow {
  position: absolute;
  left: 50%;
  top: 4%;
  width: 520px;
  height: 520px;
  transform: translate(-50%, -38%);
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 207, 122, 0.38) 0%, rgba(255, 180, 90, 0.12) 30%, transparent 62%);
  animation: flicker 5s ease-in-out infinite;
  pointer-events: none;
}

@keyframes flicker {
  0%, 100% { opacity: 1; }
  45% { opacity: 0.86; }
  50% { opacity: 0.97; }
  53% { opacity: 0.8; }
  60% { opacity: 1; }
}

.skyline {
  position: absolute;
  z-index: 2;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 280px;
  object-fit: cover;
  object-position: bottom;
}

.hero::after {
  /* Wet cobblestones catching the lamplight. */
  content: "";
  position: absolute;
  z-index: 3;
  inset: auto 0 0 0;
  height: 60px;
  background:
    radial-gradient(ellipse 18% 100% at calc(100% - clamp(1rem, 10vw, 12rem) - 55px) 0%, rgba(255, 207, 122, 0.25), transparent 70%),
    linear-gradient(180deg, #0b0e12, #05070a);
  border-top: 1px solid #1f262e;
}

/* --- Notice --------------------------------------------------------------- */

.notice {
  max-width: 44rem;
  margin: 0 auto;
  padding: 0 var(--gutter);
  position: relative;
  top: -1.5rem;
  z-index: 6;
}

.notice p {
  margin: 0;
  padding: 0.9rem 1.4rem;
  text-align: center;
  color: var(--ink);
  background: linear-gradient(180deg, var(--parchment), var(--parchment-lo));
  border: 1px solid #8c7346;
  outline: 1px solid var(--parchment-lo);
  outline-offset: 3px;
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.5);
}

/* --- Sections ------------------------------------------------------------- */

main {
  position: relative;
}

.section {
  max-width: var(--measure);
  margin: 0 auto;
  padding: 5rem var(--gutter);
}

.plate {
  text-align: center;
  margin-bottom: 3rem;
}

.plate-numeral {
  display: inline-grid;
  place-items: center;
  min-width: 3rem;
  height: 3rem;
  padding: 0 0.6rem;
  border-radius: 999px;
  font-family: var(--display);
  font-weight: 700;
  color: var(--ink);
  background: radial-gradient(circle at 35% 30%, var(--brass-hi), var(--brass) 55%, var(--brass-lo));
  border: 1px solid #3b2810;
  box-shadow: 0 0 0 4px var(--soot), 0 0 0 5px var(--brass-lo);
}

.plate h2 {
  margin: 1rem 0 0.25rem;
  font-family: var(--display);
  font-weight: 700;
  font-size: clamp(2rem, 5vw, 3rem);
  color: var(--parchment);
  letter-spacing: 0.04em;
}

.plate h2::before,
.plate h2::after {
  content: "";
  display: inline-block;
  vertical-align: middle;
  width: clamp(1.5rem, 8vw, 5rem);
  height: 1px;
  margin: 0 0.8rem;
  background: linear-gradient(90deg, transparent, var(--brass));
}

.plate h2::after {
  background: linear-gradient(90deg, var(--brass), transparent);
}

.plate-lede {
  margin: 0;
  font-style: italic;
  color: var(--text-dim);
}

/* Code panels. */

.code {
  margin: 0;
  padding: 1.4rem 1.5rem;
  overflow-x: auto;
  font-family: var(--mono);
  font-size: 0.86rem;
  line-height: 1.65;
  color: #d8d2c4;
  background: linear-gradient(180deg, #14181d, #0e1114);
  border: 1px solid var(--brass-lo);
  border-radius: 6px;
  box-shadow:
    0 0 0 4px #1a1510,
    0 0 0 5px color-mix(in srgb, var(--brass) 55%, transparent),
    0 18px 40px rgba(0, 0, 0, 0.55);
  tab-size: 4;
  font-variant-ligatures: none;
}

.code code {
  font-size: inherit;
  background: none;
  border: 0;
  padding: 0;
}

.code .k { color: #e0a96d; }
.code .s { color: #a8c98a; }
.code .c { color: #77808a; font-style: italic; }
.code .a { color: var(--verdigris); }
.code .m { color: var(--brass-hi); }
.code .y { color: #9fc4e0; }
.code .f { color: #e8d6a8; }
.code .n { color: #d89a7a; }
.code .t { color: var(--copper); filter: brightness(1.35); }
.code .r { color: #ffcf7a; font-weight: 700; }

.hello {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.5fr);
  gap: 3rem;
  align-items: center;
}

.hello-text p:first-child {
  margin-top: 0;
}

.hello-text p:first-child::first-letter {
  float: left;
  font-family: var(--display);
  font-weight: 700;
  font-size: 3.6rem;
  line-height: 0.85;
  padding: 0.3rem 0.5rem 0 0;
  color: var(--brass);
}

/* Patents. */

.patents {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 14rem), 1fr));
  gap: 1.5rem;
}

.patent {
  position: relative;
  padding: 1.6rem 1.4rem 1.4rem;
  color: var(--ink);
  background:
    radial-gradient(ellipse at 20% 0%, rgba(255, 255, 255, 0.35), transparent 60%),
    linear-gradient(180deg, var(--parchment), var(--parchment-lo));
  border: 1px solid #8c7346;
  outline: 1px solid color-mix(in srgb, var(--parchment-lo) 60%, transparent);
  outline-offset: 4px;
  box-shadow: 0 10px 28px rgba(0, 0, 0, 0.45);
  transform: rotate(var(--tilt, 0deg));
  transition: transform 0.2s ease;
}

.patent:nth-child(3n + 1) { --tilt: -0.6deg; }
.patent:nth-child(3n + 2) { --tilt: 0.4deg; }
.patent:nth-child(3n) { --tilt: -0.2deg; }

.patent:hover {
  transform: rotate(0deg) translateY(-3px);
}

.patent-no {
  margin: 0;
  font-variant: small-caps;
  letter-spacing: 0.15em;
  font-size: 0.9rem;
  color: #7a5a2c;
}

.patent h3 {
  margin: 0.3rem 0 0.6rem;
  font-family: var(--display);
  font-weight: 700;
  font-size: 1.15rem;
  line-height: 1.25;
}

.patent p:last-child {
  margin: 0;
  font-size: 1.05rem;
  line-height: 1.5;
}

.patent::after {
  /* A wax seal. */
  content: "";
  position: absolute;
  right: 1rem;
  top: 1rem;
  width: 1.6rem;
  height: 1.6rem;
  border-radius: 50%;
  background: radial-gradient(circle at 35% 30%, #c8503c, #8a2418 70%);
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.4);
}

/* Specimens. */

.specimens {
  max-width: 56rem;
  margin: 0 auto;
}

.specimen-tabs {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
}

.specimen-tab {
  font: inherit;
  font-variant: small-caps;
  letter-spacing: 0.1em;
  color: var(--text);
  background: linear-gradient(180deg, var(--iron-hi), var(--iron));
  border: 1px solid var(--brass-lo);
  border-radius: 4px;
  padding: 0.45rem 1.1rem;
  cursor: pointer;
}

.specimen-tab:hover {
  color: var(--brass-hi);
}

.specimen-tab[aria-selected="true"] {
  color: var(--ink);
  background: linear-gradient(180deg, var(--brass-hi), var(--brass) 60%, var(--brass-lo));
  border-color: #3b2810;
}

.specimen-caption {
  max-width: 44rem;
  margin: 0 auto 1.5rem;
  text-align: center;
  color: var(--text-dim);
}

/* Getting started. */

.start {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.2fr);
  gap: 3rem;
  align-items: center;
}

.start-steps {
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: step;
}

.start-steps li {
  counter-increment: step;
  position: relative;
  padding-left: 3.25rem;
  margin-bottom: 1.4rem;
  color: var(--text-dim);
}

.start-steps li strong {
  color: var(--parchment);
  font-weight: 400;
}

.start-steps li::before {
  content: counter(step, upper-roman);
  position: absolute;
  left: 0;
  top: 0.1rem;
  display: grid;
  place-items: center;
  width: 2.2rem;
  height: 2.2rem;
  border-radius: 50%;
  font-family: var(--display);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--brass-hi);
  border: 1px solid var(--brass-lo);
  background: var(--soot);
}

.terminal {
  border-radius: 8px;
}

.terminal-bar {
  display: flex;
  gap: 0.4rem;
  padding: 0.55rem 0.9rem;
  background: linear-gradient(180deg, #3a2e1c, #241c11);
  border: 1px solid var(--brass-lo);
  border-bottom: 0;
  border-radius: 6px 6px 0 0;
}

.terminal-bar span {
  width: 0.7rem;
  height: 0.7rem;
  border-radius: 50%;
  background: radial-gradient(circle at 35% 30%, var(--brass-hi), var(--brass-lo));
}

.terminal .code {
  border-radius: 0 0 6px 6px;
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.55);
}

.shell code {
  display: grid;
}

.shell .line::before {
  content: "$ ";
  color: var(--verdigris);
  user-select: none;
}

.start-more {
  margin: 2.5rem 0 0;
  text-align: center;
  color: var(--text-dim);
}

/* Roadmap. */

.roadmap {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.75rem;
  max-width: 50rem;
  margin: 0 auto;
  padding: 0;
  list-style: none;
}

.roadmap li {
  padding: 0.4rem 1rem 0.4rem 0.8rem;
  border: 1px dashed color-mix(in srgb, var(--verdigris) 55%, transparent);
  border-radius: 3px;
  color: var(--verdigris);
  font-variant: small-caps;
  letter-spacing: 0.06em;
  background: color-mix(in srgb, var(--verdigris) 6%, transparent);
}

.roadmap li::before {
  content: "✎ ";
  opacity: 0.7;
}

/* FAQ. */

.faq {
  max-width: 46rem;
  margin: 0 auto;
  border-top: 1px solid color-mix(in srgb, var(--brass) 30%, transparent);
}

.faq-item {
  border-bottom: 1px solid color-mix(in srgb, var(--brass) 30%, transparent);
}

.faq-question {
  display: flex;
  align-items: center;
  gap: 0.9rem;
  width: 100%;
  padding: 1.1rem 0.25rem;
  font: inherit;
  font-size: 1.25rem;
  text-align: left;
  color: var(--parchment);
  background: none;
  border: 0;
  cursor: pointer;
}

.faq-question:hover {
  color: var(--brass-hi);
}

.faq-cog {
  display: inline-block;
  color: var(--brass);
  font-size: 1.2rem;
  transition: transform 0.4s ease;
}

.faq-question[aria-expanded="true"] .faq-cog {
  transform: rotate(120deg);
}

.faq-answer {
  padding: 0 0.25rem 1.2rem 2.4rem;
  color: var(--text-dim);
}

.faq-answer p {
  margin: 0;
}

/* --- Footer --------------------------------------------------------------- */

.site-footer {
  position: relative;
  z-index: 6;
  margin-top: 4rem;
  padding: 3rem var(--gutter) 2rem;
  background: linear-gradient(180deg, #0e1216, #06080a);
  border-top: 1px solid var(--brass-lo);
  box-shadow: inset 0 1px 0 rgba(241, 213, 138, 0.12);
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  gap: 2rem;
  flex-wrap: wrap;
  max-width: var(--measure);
  margin: 0 auto;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 1rem;
  max-width: 28rem;
  color: var(--text-dim);
}

.footer-brand p {
  margin: 0;
}

.footer-links {
  display: flex;
  gap: 1.25rem;
  flex-wrap: wrap;
  align-items: center;
  font-variant: small-caps;
  letter-spacing: 0.08em;
}

.footer-motto {
  max-width: var(--measure);
  margin: 2rem auto 0;
  text-align: center;
  font-style: italic;
  color: color-mix(in srgb, var(--text-dim) 70%, transparent);
}

/* --- Small screens -------------------------------------------------------- */

@media (max-width: 860px) {
  .hello,
  .start {
    grid-template-columns: minmax(0, 1fr);
    gap: 2rem;
  }

  .hero {
    padding-bottom: 12rem;
  }

  .lamp {
    width: 70px;
    right: 1rem;
  }

  .lamp-glow {
    width: 320px;
    height: 320px;
  }

  .gear-b {
    display: none;
  }

  .gear-a {
    width: 260px;
    top: -80px;
    right: -100px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
  }

  html {
    scroll-behavior: auto;
  }
}