/* Sighook.im — Minimal UNIX Technical Theme */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600&family=Fira+Code:wght@400;500&display=swap');

:root {
  /* Light */
  --bg: #ffffff;
  --fg: #2e2e2e;
  --h-color: #111111;
  --accent: #0056b3;

  --code-bg: #f6f8fa;
  --border: #e5e7eb;
  --border-strong: #d1d5db;

  --max-width: 72ch;

  /* Type scale */
  --fs-base: 1rem;
  --fs-h1: clamp(1.7rem, 4vw, 2rem);
  --fs-h2: clamp(1.35rem, 3vw, 1.55rem);
  --fs-h3: 1.15rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1113;
    --fg: #d6d6d6;
    --h-color: #f2f2f2;
    --accent: #5ab0ff;

    --code-bg: #16181a;
    --border: #2a2e33;
    --border-strong: #3a3f45;
  }
}

/* Base */

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: 'Inter', system-ui, sans-serif;
  font-size: var(--fs-base);
  line-height: 1.6;

  color: var(--fg);
  background: var(--bg);

  max-width: var(--max-width);
  margin: 0 auto;
  padding: 2rem 1.2rem;

  text-rendering: optimizeLegibility;
}

/* Header */

header {
  border-bottom: 2px solid var(--accent);
  padding-bottom: 0.8rem;
  margin-bottom: 2rem;
}

header h1 {
  font-size: 1.6rem;
  margin: 0;
  font-weight: 600;
}

header h1 a {
  color: var(--accent);
  text-decoration: none;
}

/* Navigation */

nav {
  margin-top: 0.5rem;
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

nav a {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--fg);
  text-decoration: none;
  opacity: 0.75;
}

nav a:hover {
  opacity: 1;
  color: var(--accent);
}

/* Typography */

main h1,
main h2,
main h3 {
  font-weight: 600;
  letter-spacing: -0.01em;
  line-height: 1.3;

  margin-top: 2rem;
  margin-bottom: 0.5rem;
}

main h1 {
  font-size: var(--fs-h1);
  margin-top: 0;
  border-bottom: 1px solid var(--border-strong);
  padding-bottom: 0.25rem;
}

main h2 {
  font-size: var(--fs-h2);
  border-bottom: 1px solid var(--border);
  padding-bottom: 0.2rem;
}

main h3 {
  font-size: var(--fs-h3);
}

/* UNIX-style section markers */

main h1::before {
  content: "# ";
  font-family: 'Fira Code', monospace;
  opacity: 0.7;
}

main h2::before {
  content: "## ";
  font-family: 'Fira Code', monospace;
  opacity: 0.6;
}

main h3::before {
  content: "### ";
  font-family: 'Fira Code', monospace;
  opacity: 0.5;
}

/* Text */

p {
  margin: 0.9rem 0;
}

/* Links */

a {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 2px;
}

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

/* Tables */

table {
  width: 100%;
  margin: 1.6rem 0;
  border-collapse: collapse;
  font-size: 0.85rem;
}

th {
  text-align: left;
  padding: 0.55rem 0.65rem;
  border-bottom: 1px solid var(--border-strong);
  color: var(--h-color);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

td {
  padding: 0.55rem 0.65rem;
  border-bottom: 1px solid var(--border);
  vertical-align: middle;
}

/* Compact identifier columns */

td:nth-child(1),
th:nth-child(1),
td:nth-child(2),
th:nth-child(2) {
  white-space: nowrap;
  width: 1%;
}

td:nth-child(1) {
  font-family: 'Fira Code', monospace;
  font-weight: 500;
  color: var(--h-color);
}

/* Minimal hover (no zebra) */

tr:hover {
  background: var(--code-bg);
}

/* Code */

code,
pre {
  font-family: 'Fira Code', monospace;
}

code {
  font-size: 0.88em;
  background: var(--code-bg);
  padding: 0.12em 0.3em;
  border: 1px solid var(--border);
  border-radius: 0;
  color: var(--h-color);
}

pre {
  background: var(--code-bg);
  padding: 0.8rem;
  border: 1px solid var(--border-strong);
  border-radius: 0;
  overflow-x: auto;
  margin: 1.3rem 0;
}

pre code {
  background: none;
  padding: 0;
  font-size: 0.85em;
  border: 0;
}

/* Horizontal rules — subtle structural separators */

hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 2.5rem auto;
  width: 60%;
  opacity: 0.6;
}

/* Footer */

footer {
  margin-top: 4rem;
  padding-top: 1.2rem;
  border-top: 1px solid var(--border);
  text-align: center;
  font-family: 'Fira Code', monospace;
  font-size: 0.75rem;
  opacity: 0.4;
}

/* Selection */

::selection {
  background: var(--h-color);
  color: var(--bg);
}

/* Mobile */

@media (max-width: 600px) {
  body {
    padding: 1.5rem 1rem;
  }

  table {
    display: block;
    overflow-x: auto;
  }

  th, td {
    padding: 0.45rem;
  }
}