@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Mono:ital,wght@0,400;0,500;1,400&display=swap');

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

:root {
  --bg: #0a0a0a;
  --text: #9a9a9a;
  --accent: #4a9a6a;
  --dim: #3a3a3a;
  --invisible: #1a1a1a;
  --font: 'IBM Plex Mono', 'Courier New', monospace;
}

html {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 14px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

body {
  max-width: 640px;
  margin: 0 auto;
  padding: 120px 24px 160px;
}

::selection {
  background: rgba(74, 154, 106, 0.3);
  color: var(--text);
}

/* Section spacing */
section {
  margin-bottom: 80px;
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

section.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Opening */
.opening .comment {
  color: var(--dim);
  font-size: 12px;
  margin-bottom: 32px;
}

.opening .tagline {
  color: var(--text);
  font-size: 15px;
}

.opening .tagline em {
  font-style: italic;
  color: #b0b0b0;
}

/* Type annotation */
.type-block {
  border-left: 1px solid var(--dim);
  padding-left: 20px;
}

.type-block .keyword {
  color: #6a8aaa;
}

.type-block .type-name {
  color: #9a7aaa;
}

.type-block .comment {
  color: var(--dim);
  font-style: italic;
}

/* Definitions */
.definitions {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.def-row {
  display: grid;
  grid-template-columns: 110px 1fr;
  gap: 8px;
  align-items: baseline;
}

.def-term {
  color: var(--accent);
  transition: color 0.3s ease;
  cursor: default;
}

.def-desc {
  color: var(--text);
  transition: color 0.3s ease;
}

.def-row:hover .def-term { color: #6abaaa; }
.def-row:hover .def-desc { color: #bbbbbb; }

/* Language-specific hover colors */
.def-row[data-lang="go"]:hover .def-term     { color: #79d4f0; }
.def-row[data-lang="c"]:hover .def-term      { color: #f08080; }
.def-row[data-lang="ts"]:hover .def-term     { color: #4fc1ff; }
.def-row[data-lang="js"]:hover .def-term     { color: #f5d67a; }
.def-row[data-lang="math"]:hover .def-term   { color: #c792ea; }

/* /dev/null meditation */
.terminal {
  background: #060606;
  border: 1px solid var(--dim);
  padding: 20px 24px;
  margin-bottom: 20px;
}

.terminal .prompt {
  color: var(--accent);
}

.terminal .cmd {
  color: var(--text);
}

.cursor {
  display: inline-block;
  width: 8px;
  height: 14px;
  margin-left: 10px;
  background: var(--accent);
  vertical-align: text-bottom;
  animation: blink 1.2s step-end infinite;
}

@keyframes blink {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0; }
}

.meditation {
  color: var(--dim);
  font-size: 12px;
  border-left: 1px solid var(--invisible);
  padding-left: 16px;
  font-style: italic;
}

.meditation p + p {
  margin-top: 4px;
}

/* Observer fragment */
.code-block {
  color: var(--dim);
  white-space: pre;
  font-size: 13px;
  overflow-x: auto;
}

.code-block .comment-accent {
  color: var(--accent);
  opacity: 0.6;
}

/* Koan */
.koan {
  color: var(--text);
  white-space: pre-line;
}

.koan .question {
  color: #c0c0c0;
}

/* Footer */
footer {
  margin-top: 120px;
  border-top: 1px solid var(--invisible);
  padding-top: 32px;
}

.return-statement {
  color: var(--dim);
  font-size: 13px;
}

.return-statement .keyword {
  color: #6a8aaa;
  opacity: 0.6;
}

.void-copyright {
  color: var(--invisible);
  font-size: 11px;
  margin-top: 12px;
  user-select: none;
}

/* Language switcher */
.lang-switch {
  position: fixed;
  top: 24px;
  right: 28px;
  font-size: 11px;
  color: var(--dim);
  z-index: 100;
}

.lang-current {
  color: var(--accent);
}

.lang-link {
  color: var(--dim);
  text-decoration: none;
  transition: color 0.2s ease;
}

.lang-link:hover {
  color: var(--text);
}

/* Claude credit */
.claude-credit {
  color: var(--invisible);
  font-size: 11px;
  margin-top: 4px;
  transition: color 0.3s ease;
}

.claude-credit:hover {
  color: var(--dim);
}

/* Cursor trail */
.trail-dot {
  position: fixed;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--accent);
  pointer-events: none;
  opacity: 0;
  transform: translate(-50%, -50%);
  animation: trail-fade 0.8s ease forwards;
  z-index: 9999;
}

@keyframes trail-fade {
  0%   { opacity: 0.5; transform: translate(-50%, -50%) scale(1); }
  100% { opacity: 0;   transform: translate(-50%, -50%) scale(0); }
}

/* Glitch */
@keyframes glitch-char {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0; }
}

.glitch {
  animation: glitch-char 0.08s step-end;
}

/* Mobile */
@media (max-width: 480px) {
  body {
    padding: 80px 20px 120px;
  }

  .def-row {
    grid-template-columns: 90px 1fr;
  }

  section {
    margin-bottom: 60px;
  }
}