@font-face {
  font-family: "Intel One Mono";
  src: url("assets/fonts/IntelOneMono-Regular.ttf") format("truetype");
  font-display: swap;
}

:root {
  color-scheme: dark;
  --code-shell-height: min(34rem, 56vh);
  --bg: #1d2021;
  --bg-elevated: #282828;
  --bg-soft: #32302f;
  --bg-chip: rgba(80, 73, 69, 0.72);
  --text: #ebdbb2;
  --muted: #a89984;
  --border: rgba(146, 131, 116, 0.36);
  --accent: #d79921;
  --accent-soft: rgba(215, 153, 33, 0.2);
  --blue: #83a598;
  --green: #b8bb26;
  --aqua: #8ec07c;
  --orange: #fe8019;
  --red: #fb4934;
  --purple: #d3869b;
  --shadow: 0 24px 80px rgba(0, 0, 0, 0.38);
  --focus: 0 0 0 3px rgba(250, 189, 47, 0.28);
}

:root[data-theme="light"] {
  color-scheme: light;
  --bg: #fbf1c7;
  --bg-elevated: rgba(242, 229, 188, 0.94);
  --bg-soft: rgba(235, 219, 178, 0.96);
  --bg-chip: rgba(213, 196, 161, 0.7);
  --text: #3c3836;
  --muted: #7c6f64;
  --border: rgba(124, 111, 100, 0.24);
  --accent: #b57614;
  --accent-soft: rgba(181, 118, 20, 0.14);
  --blue: #076678;
  --green: #79740e;
  --aqua: #427b58;
  --orange: #af3a03;
  --red: #9d0006;
  --purple: #8f3f71;
  --shadow: 0 22px 60px rgba(60, 56, 54, 0.12);
  --focus: 0 0 0 3px rgba(181, 118, 20, 0.2);
}

* {
  box-sizing: border-box;
}

html,
body {
  min-height: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Intel One Mono", monospace;
  transition: background-color 180ms ease, color 180ms ease;
}

button,
code,
pre {
  font: inherit;
}

button {
  color: inherit;
}

.background {
  position: fixed;
  inset: 0;
  background:
    radial-gradient(circle at top, rgba(250, 189, 47, 0.1), transparent 32%),
    radial-gradient(circle at bottom right, rgba(131, 165, 152, 0.12), transparent 28%),
    linear-gradient(180deg, rgba(60, 56, 54, 0.08), transparent 36%);
  pointer-events: none;
}

.background::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(168, 153, 132, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(168, 153, 132, 0.06) 1px, transparent 1px);
  background-size: 30px 30px;
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.5), transparent 88%);
}

.shell {
  position: relative;
  z-index: 1;
  min-height: 100vh;
  width: min(100%, 980px);
  margin: 0 auto;
  padding: 0.8rem;
  display: grid;
  place-content: center;
  gap: 0.9rem;
}

.masthead {
  display: grid;
  justify-items: center;
  gap: 0.35rem;
  text-align: center;
}

.theme-switcher {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.24rem;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 999px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(10px);
}

.theme-button {
  display: inline-grid;
  place-items: center;
  width: 1.95rem;
  height: 1.95rem;
  padding: 0;
  border: 0;
  border-radius: 999px;
  background: transparent;
  cursor: pointer;
  transition: transform 140ms ease, background-color 140ms ease, color 140ms ease;
}

.theme-button svg {
  width: 0.95rem;
  height: 0.95rem;
  fill: currentColor;
}

.theme-button[aria-pressed="true"] {
  background: var(--accent-soft);
  color: var(--accent);
}

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

.theme-button:focus-visible,
.language-button:focus-visible,
.code-block:focus-visible {
  outline: none;
  box-shadow: var(--focus);
}

h1 {
  margin: 0;
  font-size: clamp(0.95rem, 2.2vw, 1.25rem);
  letter-spacing: 0.08em;
  text-transform: lowercase;
  font-weight: 400;
}

.tagline {
  margin: 0;
  color: var(--muted);
  font-size: clamp(0.64rem, 1.5vw, 0.78rem);
  letter-spacing: 0.04em;
}

.viewer {
  background: linear-gradient(180deg, rgba(60, 56, 54, 0.16), transparent 40%), var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 1.1rem;
  padding: 0.78rem;
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
}

.viewer-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 0.8rem;
  margin-bottom: 0.72rem;
}

.eyebrow {
  margin: 0 0 0.28rem;
  color: var(--muted);
  font-size: 0.62rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.viewer-header h2 {
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.4rem;
  font-size: clamp(0.84rem, 2vw, 1rem);
  font-weight: 400;
}

.algorithm-chip {
  padding: 0.14rem 0.42rem;
  border-radius: 999px;
  background: var(--bg-chip);
  color: var(--muted);
  font-size: 0.66rem;
}

.viewer-status {
  margin: 0;
  color: var(--accent);
  font-size: 0.68rem;
  white-space: nowrap;
}

.toolbar-wrap {
  margin-bottom: 0.75rem;
}

.language-strip {
  display: flex;
  gap: 0.45rem;
  padding: 0;
  margin: 0;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}

.language-strip::-webkit-scrollbar {
  display: none;
}

.language-button {
  width: 2.35rem;
  height: 2.35rem;
  padding: 0;
  display: inline-grid;
  place-items: center;
  border: 1px solid var(--border);
  border-radius: 0.8rem;
  background: var(--bg-soft);
  cursor: pointer;
  transition:
    transform 140ms ease,
    border-color 140ms ease,
    background-color 140ms ease,
    box-shadow 140ms ease;
}

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

.language-button[aria-pressed="true"] {
  border-color: rgba(250, 189, 47, 0.55);
  background: var(--accent-soft);
  box-shadow: inset 0 0 0 1px rgba(250, 189, 47, 0.16);
}

.language-button img {
  width: 1.1rem;
  height: 1.1rem;
  display: block;
}

.code-shell {
  height: var(--code-shell-height);
  border-radius: 0.9rem;
  border: 1px solid var(--border);
  background: rgba(29, 32, 33, 0.18);
  overflow: hidden;
}

.code-shell.is-switching .code-block {
  opacity: 0;
  transform: translateY(8px);
}

.code-block {
  margin: 0;
  padding: 0.85rem;
  height: 100%;
  overflow: auto;
  overscroll-behavior: contain;
  scrollbar-gutter: stable;
  line-height: 1.72;
  font-size: clamp(0.68rem, 1.7vw, 0.9rem);
  transition: opacity 140ms ease, transform 140ms ease;
}

.code-block,
.code-block code {
  background: transparent;
  color: var(--text);
}

.token.comment,
.token.prolog,
.token.doctype,
.token.cdata {
  color: var(--muted);
}

.token.punctuation,
.token.operator {
  color: color-mix(in srgb, var(--text) 82%, transparent);
}

.token.property,
.token.tag,
.token.boolean,
.token.number,
.token.constant,
.token.symbol,
.token.deleted {
  color: var(--orange);
}

.token.selector,
.token.attr-name,
.token.string,
.token.char,
.token.builtin,
.token.inserted {
  color: var(--green);
}

.token.atrule,
.token.keyword,
.token.variable {
  color: var(--red);
}

.token.function,
.token.class-name {
  color: var(--blue);
}

.token.regex,
.token.important {
  color: var(--purple);
}

.token.entity,
.token.url {
  color: var(--aqua);
}

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

@media (max-width: 640px) {
  :root {
    --code-shell-height: 48vh;
  }

  .shell {
    padding: 0.55rem;
    gap: 0.72rem;
  }

  .viewer {
    padding: 0.68rem;
    border-radius: 0.92rem;
  }

  .viewer-header {
    display: grid;
    gap: 0.45rem;
  }

  .viewer-status {
    white-space: normal;
  }

  .code-block {
    padding: 0.72rem;
  }
}

@supports (height: 1dvh) {
  :root {
    --code-shell-height: min(34rem, 56dvh);
  }

  @media (max-width: 640px) {
    :root {
      --code-shell-height: 48dvh;
    }
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation: none !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}