/* ──────────────────────────────────────────────────────────────────
 * atty.sh — terminal-aesthetic stylesheet.
 *
 * Design rules:
 *   • One typeface, monospace, no exceptions.
 *   • Limited palette. Phosphor green for the prompt; dim gray for
 *     anything that mimics ghost text.
 *   • Generous line-height so dense code reads cleanly.
 *   • No JS. Animations are pure CSS keyframes.
 * ────────────────────────────────────────────────────────────── */

:root {
  --bg:        #0e1116;
  --bg-soft:   #181c20;
  --bg-code:   #15191d;
  --fg:        #d8d2c2;
  --fg-soft:   #a9a395;
  --fg-dim:    #6c7086;
  --accent:    #7ee787;   /* phosphor green */
  --accent-2:  #89dceb;   /* cyan */
  --warn:      #fab387;
  --danger:    #f38ba8;
  --border:    #232830;
  --rule:      #1c2026;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: "JetBrains Mono", "Fira Code", "SF Mono", ui-monospace,
               SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 15px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* Scanline tint — barely perceptible vertical gradient that gives the
 * page just a hint of CRT phosphor warmth. */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(ellipse at top, rgba(126,231,135,0.025), transparent 60%),
    radial-gradient(ellipse at bottom, rgba(137,220,235,0.02), transparent 60%);
  z-index: 0;
}

a {
  color: var(--accent-2);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 120ms, border-color 120ms;
}
a:hover { border-color: currentColor; }

/* ── Header ─────────────────────────────────────────────────────── */

header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.1rem 2rem;
  border-bottom: 1px solid var(--border);
  background: rgba(14, 17, 22, 0.85);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  position: sticky;
  top: 0;
  z-index: 10;
}
.logo {
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--fg);
  border-bottom: none !important;
}
.logo:hover { color: var(--accent); }
.logo .prompt { color: var(--accent); margin-right: 0.2em; }

nav { display: flex; gap: 1.5rem; font-size: 0.92rem; }
nav a { color: var(--fg-dim); }
nav a:hover { color: var(--accent-2); }

@media (max-width: 640px) {
  header { flex-direction: column; gap: 0.8rem; padding: 1rem; }
  nav { gap: 1rem; font-size: 0.85rem; }
}

/* ── Cursor block (blinks) ──────────────────────────────────────── */

.cursor {
  display: inline-block;
  width: 0.55em;
  height: 1.1em;
  background: var(--fg);
  vertical-align: text-bottom;
  margin-left: 3px;
  animation: blink 1.05s steps(2, start) infinite;
}
@keyframes blink { to { visibility: hidden; } }

/* ── Main column + sidebar TOC ──────────────────────────────────── */
/*
 * Layout rules:
 *   - Content column is always 78ch wide. The TOC must NOT squeeze it.
 *   - Narrow viewports (<1280px): TOC renders inline at the top of the
 *     page (kramdown's default position) as a compact panel.
 *   - Wide viewports (≥1280px): CSS grid pairs the 78ch content with a
 *     17rem sidebar (sticky, scroll-spy-aware). The pair is centered
 *     as a unit, so the content keeps its original column width and
 *     the TOC lives entirely in space that would otherwise be margin.
 */

main {
  max-width: 78ch;
  margin: 0 auto;
  padding: 3rem 1.5rem 6rem;
  position: relative;
  z-index: 1;
}

/* Inline (narrow-screen) TOC — a compact panel above the content. */
#markdown-toc {
  font-size: 0.92rem;
  line-height: 1.7;
  margin: 1.5rem 0 2.5rem;
  padding: 1rem 1.1rem 1rem 2.1rem;
  border-left: 2px solid var(--accent);
  background: rgba(255, 255, 255, 0.02);
  list-style: none;
  counter-reset: toc;
}
#markdown-toc ul {
  list-style: none;
  padding-left: 1.1rem;
  margin: 0.15rem 0;
  border-left: 1px solid var(--rule);
}
#markdown-toc li {
  margin: 0.15rem 0;
  position: relative;
  counter-increment: toc;
}
#markdown-toc > li::marker { content: none; }
#markdown-toc a {
  display: block;
  color: var(--fg-soft);
  text-decoration: none;
  padding: 0.2rem 0.4rem 0.2rem 0.6rem;
  border-left: 2px solid transparent;
  margin-left: -0.6rem;
  border-radius: 0 3px 3px 0;
  transition: color 120ms, border-color 120ms, background 120ms;
}
#markdown-toc a:hover {
  color: var(--fg);
  background: rgba(126, 231, 135, 0.04);
}
#markdown-toc a.is-active {
  color: var(--accent);
  border-left-color: var(--accent);
  background: rgba(126, 231, 135, 0.06);
}
#markdown-toc ul a {
  font-size: 0.88rem;
  padding-left: 0.5rem;
  margin-left: -0.5rem;
  color: var(--fg-dim);
}
#markdown-toc ul ul a { padding-left: 0.4rem; opacity: 0.85; }
#markdown-toc::before {
  content: "On this page";
  display: block;
  margin-left: -1.2rem;
  margin-bottom: 0.6rem;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  opacity: 0.85;
}

/* Wide-screen grid: 78ch content + 17rem sticky sidebar, centered.
 * Only kicks in on pages that have a TOC — pages without one keep
 * the simple centered 78ch column. */
@media (min-width: 1280px) {
  main:has(#markdown-toc) {
    max-width: calc(78ch + 4rem + 17rem);
    display: grid;
    grid-template-columns: 78ch 17rem;
    column-gap: 4rem;
    align-items: start;
  }
  main:has(#markdown-toc) > * {
    grid-column: 1;
    min-width: 0;
  }
  main > #markdown-toc {
    grid-column: 2;
    grid-row: 1 / span 9999;
    position: sticky;
    top: 6rem;
    align-self: start;
    max-height: calc(100vh - 8rem);
    overflow-y: auto;
    margin: 0;
    background: transparent;
    border-left: 1px solid var(--border);
    padding: 0.2rem 0 0.5rem 1.2rem;
    scrollbar-width: thin;
    scrollbar-color: var(--border) transparent;
  }
  main > #markdown-toc::-webkit-scrollbar { width: 6px; }
  main > #markdown-toc::-webkit-scrollbar-thumb {
    background: var(--border); border-radius: 3px;
  }
}

h1, h2, h3, h4 {
  color: var(--fg);
  margin-top: 2.4em;
  margin-bottom: 0.6em;
  font-weight: 600;
  letter-spacing: -0.005em;
}
h1 { font-size: 1.9rem; margin-top: 0; }
h2 {
  font-size: 1.35rem;
  border-bottom: 1px solid var(--rule);
  padding-bottom: 0.35em;
}
h3 { font-size: 1.05rem; color: var(--accent-2); }
h4 { font-size: 0.95rem; color: var(--accent); margin-top: 1.8em; }

h2::before, h3::before {
  color: var(--accent);
  margin-right: 0.5em;
  opacity: 0.65;
}
h2::before { content: "##"; }
h3::before { content: "###"; }

p { margin: 1em 0; }
em { color: var(--fg); font-style: italic; }
strong { color: var(--accent); font-weight: 600; }

/* ── Code ────────────────────────────────────────────────────────── */

code {
  background: var(--bg-code);
  padding: 0.12em 0.4em;
  border-radius: 3px;
  border: 1px solid var(--border);
  font-size: 0.92em;
  color: var(--fg);
}
pre {
  background: var(--bg-code);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 1rem 1.2rem;
  overflow-x: auto;
  font-size: 0.86rem;
  line-height: 1.55;
  position: relative;
}
pre::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 3px;
  height: 100%;
  background: var(--accent);
  opacity: 0.4;
  border-radius: 6px 0 0 6px;
}
pre code {
  background: transparent;
  padding: 0;
  border: 0;
  font-size: 1em;
  color: var(--fg);
}

/* Rouge syntax tokens — terminal-ish palette */
.highlight .c, .highlight .c1, .highlight .cm, .highlight .cp { color: var(--fg-dim); font-style: italic; }
.highlight .k, .highlight .kd, .highlight .kr, .highlight .kt { color: var(--accent); }
.highlight .s, .highlight .s1, .highlight .s2, .highlight .sx { color: var(--accent-2); }
.highlight .mi, .highlight .mf, .highlight .il               { color: var(--warn); }
.highlight .n, .highlight .nv                                { color: var(--fg); }
.highlight .nf, .highlight .nb                               { color: var(--accent-2); }
.highlight .o, .highlight .p                                 { color: var(--fg-soft); }

/* ── Blockquotes ────────────────────────────────────────────────── */

blockquote {
  border-left: 2px solid var(--accent);
  padding-left: 1em;
  margin-left: 0;
  color: var(--fg-soft);
  font-style: italic;
}
blockquote p { margin: 0.3em 0; }

/* ── Tables ─────────────────────────────────────────────────────── */

table {
  border-collapse: collapse;
  width: 100%;
  margin: 1.2em 0;
  font-size: 0.88rem;
}
th, td {
  border: 1px solid var(--border);
  padding: 0.5em 0.8em;
  text-align: left;
  vertical-align: top;
}
th {
  background: var(--bg-soft);
  color: var(--accent-2);
  font-weight: 600;
}
tr:nth-child(even) td { background: rgba(24, 28, 32, 0.4); }

/* ── Lists ──────────────────────────────────────────────────────── */

ul, ol { padding-left: 1.4em; }
ul li::marker { color: var(--accent); }
ol li::marker { color: var(--accent-2); }
li { margin: 0.35em 0; }

/* ── Horizontal rule ────────────────────────────────────────────── */

hr { border: 0; border-top: 1px dashed var(--border); margin: 2.5em 0; }

/* ── Footer ─────────────────────────────────────────────────────── */

footer {
  border-top: 1px solid var(--border);
  padding: 1.5rem 2rem;
  text-align: center;
  color: var(--fg-dim);
  font-size: 0.82rem;
  position: relative;
  z-index: 1;
}
footer .prompt { color: var(--accent); margin-right: 0.4em; }
footer a { color: var(--fg-soft); }

/* ──────────────────────────────────────────────────────────────────
 * Home page specifics
 * ────────────────────────────────────────────────────────────── */

/* Wider column on the home layout — there's no TOC sidebar to share
 * the page width with, and the index has tables + multi-line code
 * blocks that benefit from the extra horizontal real estate. Match
 * the *combined* width of a doc page's (content + sidebar) so the
 * visual rhythm switching between sections stays consistent. */
.home main {
  max-width: calc(78ch + 4rem + 17rem);
  padding-top: 1.5rem;
}

.hero {
  max-width: calc(78ch + 4rem + 17rem);
  margin: 0 auto;
  padding: 4rem 1.5rem 2.5rem;
  position: relative;
  z-index: 1;
}
.hero h1 {
  font-size: 3rem;
  margin: 0 0 0.5rem;
  letter-spacing: -0.02em;
}
.hero h1 .prompt { color: var(--accent); }
.hero .tagline {
  color: var(--fg-soft);
  font-size: 1.1rem;
  margin: 0 0 2rem;
}

/* ── Terminal demo card ─────────────────────────────────────────── */

.demo {
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
  margin: 2rem 0 2.5rem;
  box-shadow: 0 10px 40px rgba(0,0,0,0.35),
              0 0 0 1px rgba(126,231,135,0.04);
}
.demo-bar {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.6rem 0.9rem;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
}
.bar-dot {
  width: 0.7rem;
  height: 0.7rem;
  border-radius: 50%;
  display: inline-block;
}
.dot-r { background: #f38ba8; }
.dot-y { background: #f9e2af; }
.dot-g { background: #a6e3a1; }
.bar-title {
  margin-left: 0.8rem;
  color: var(--fg-dim);
  font-size: 0.78rem;
}
.demo-body {
  padding: 1.2rem 1.4rem 1.4rem;
  font-size: 0.92rem;
  line-height: 1.7;
}
.demo .line { white-space: pre; }
.demo .line.dim { color: var(--fg-dim); }
.demo .line.danger { color: var(--danger); font-weight: 500; }
.demo .prompt { color: var(--accent); font-weight: 600; }
.demo .typed { color: var(--fg); }
.demo .ghost {
  color: var(--fg-dim);
  font-style: italic;
}
.demo .comment { color: var(--fg-dim); }
.demo .warn-glyph {
  color: var(--danger);
  font-weight: 700;
  margin-right: 0.5em;
}

/* CTA buttons */
.cta-row { margin-top: 1.5rem; }
.cta {
  display: inline-block;
  padding: 0.6em 1.1em;
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--fg-soft);
  background: transparent;
  margin: 0.25em 0.25em 0.25em 0;
  font-weight: 500;
  font-size: 0.92rem;
  transition: background 120ms, color 120ms, border-color 120ms;
}
.cta:hover {
  background: var(--bg-soft);
  color: var(--fg);
  border-color: var(--fg-dim);
  border-bottom-color: var(--fg-dim);
}
.cta.primary {
  border-color: var(--accent);
  color: var(--accent);
}
.cta.primary:hover {
  background: var(--accent);
  color: var(--bg);
}

/* ── Selection ──────────────────────────────────────────────────── */

::selection { background: rgba(126,231,135,0.25); color: var(--fg); }