/* ============================================================================
   insrc — TUI documentation site
   A terminal user-interface aesthetic: monospace everything, box-drawing
   chrome, phosphor accents, dark-first with a warm "paper terminal" light mode.
   Self-contained — no web fonts, no external assets.
   ========================================================================== */

/* --- reset ---------------------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { -webkit-text-size-adjust: 100%; }

/* --- design tokens: dark (default) --------------------------------------- */
:root {
  --font: ui-monospace, "SF Mono", "JetBrains Mono", "Cascadia Code",
          "Fira Code", Menlo, Consolas, "DejaVu Sans Mono", monospace;

  --bg:        #0b0e14;
  --bg-alt:    #10141c;
  --bg-inset:  #0d1119;
  --panel:     #11161f;
  --fg:        #c6cdd8;
  --fg-strong: #e8edf4;
  --muted:     #6b7688;
  --dim:       #4a5464;
  --border:    #222a36;
  --border-lit:#2f3a4a;

  --accent:    #4ade80;  /* phosphor green — primary   */
  --accent2:   #38bdf8;  /* cyan          — secondary  */
  --amber:     #fbbf24;  /* amber         — warnings   */
  --magenta:   #c084fc;  /* violet        — accents    */
  --red:       #f87171;

  --sel:       rgba(74, 222, 128, 0.22);
  --shadow:    0 18px 50px -12px rgba(0, 0, 0, 0.6);
  --scan:      rgba(255, 255, 255, 0.014);
  --radius:    8px;
  --maxw:      940px;
}

/* --- design tokens: light ("paper terminal") ----------------------------- */
:root[data-theme="light"] {
  --bg:        #f3efe4;
  --bg-alt:    #ece7d8;
  --bg-inset:  #e7e1d0;
  --panel:     #efe9db;
  --fg:        #3b3a34;
  --fg-strong: #1f1e19;
  --muted:     #7c7767;
  --dim:       #a49d89;
  --border:    #d4ccb6;
  --border-lit:#c2b99e;

  --accent:    #227a45;
  --accent2:   #1667a8;
  --amber:     #9a6b00;
  --magenta:   #7c3aad;
  --red:       #b3402f;

  --sel:       rgba(34, 122, 69, 0.16);
  --shadow:    0 14px 40px -16px rgba(60, 50, 20, 0.4);
  --scan:      rgba(0, 0, 0, 0.012);
}

/* --- base ----------------------------------------------------------------- */
html { scroll-behavior: smooth; }
body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--fg);
  font-size: 15px;
  line-height: 1.65;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  /* subtle CRT scanlines */
  background-image: repeating-linear-gradient(
      var(--scan) 0 1px, transparent 1px 3px);
}
::selection { background: var(--sel); }

a { color: var(--accent2); text-decoration: none; border-bottom: 1px dashed transparent; }
a:hover { border-bottom-color: currentColor; }

/* skip-to-content for a11y */
.skip { position: absolute; left: -9999px; }
.skip:focus { left: 12px; top: 12px; z-index: 100; background: var(--accent); color: #000; padding: 6px 10px; }

/* --- layout --------------------------------------------------------------- */
.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 20px; }
main { padding: 42px 0 90px; }
section { margin: 0 0 48px; }

/* --- top nav / menu bar --------------------------------------------------- */
.nav {
  position: sticky; top: 0; z-index: 40;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  max-width: var(--maxw); margin: 0 auto; padding: 10px 20px;
  display: flex; align-items: center; gap: 18px; flex-wrap: wrap;
}
.brand { color: var(--fg-strong); font-weight: 700; letter-spacing: 0.5px; white-space: nowrap; }
.brand .sig { color: var(--accent); }
.brand::before { content: "▌"; color: var(--accent); margin-right: 6px; }
.nav-links { display: flex; gap: 4px; flex-wrap: wrap; margin-left: auto; }
.nav-links a {
  color: var(--muted); padding: 3px 9px; border-radius: 5px; border-bottom: none;
  white-space: nowrap;
}
.nav-links a::before { content: "["; color: var(--dim); }
.nav-links a::after  { content: "]"; color: var(--dim); }
.nav-links a:hover { color: var(--fg-strong); }
.nav-links a.active { background: var(--accent); color: #05070b; font-weight: 700; }
.nav-links a.active::before, .nav-links a.active::after { color: #05070b; }
:root[data-theme="light"] .nav-links a.active { color: #f6f2e7; }
:root[data-theme="light"] .nav-links a.active::before,
:root[data-theme="light"] .nav-links a.active::after { color: #f6f2e7; }

.theme-btn {
  font: inherit; cursor: pointer; color: var(--muted);
  background: transparent; border: 1px solid var(--border);
  border-radius: 5px; padding: 3px 8px;
}
.theme-btn:hover { color: var(--accent); border-color: var(--border-lit); }

/* --- terminal window frame ----------------------------------------------- */
.term {
  border: 1px solid var(--border-lit);
  border-radius: var(--radius);
  background: var(--bg-alt);
  box-shadow: var(--shadow);
  overflow: hidden;
}
.term-bar {
  display: flex; align-items: center; gap: 8px;
  padding: 8px 12px; background: var(--panel);
  border-bottom: 1px solid var(--border);
  color: var(--muted); font-size: 12.5px;
}
.dot { width: 11px; height: 11px; border-radius: 50%; display: inline-block; }
.dot.r { background: #ff5f57; } .dot.y { background: #febc2e; } .dot.g { background: #28c840; }
.term-title { margin-left: 8px; letter-spacing: 0.4px; }
.term-title::before { content: "— "; color: var(--dim); }
.term-title::after  { content: " —"; color: var(--dim); }
.term-body { padding: 22px 22px 26px; }

/* --- hero ----------------------------------------------------------------- */
.hero { margin: 30px 0 40px; }
.banner {
  color: var(--accent); font-size: clamp(11px, 2.5vw, 17px); line-height: 1.15;
  white-space: pre; overflow-x: auto; margin-bottom: 18px;
  text-shadow: 0 0 18px color-mix(in srgb, var(--accent) 35%, transparent);
}
.tagline { color: var(--fg-strong); font-size: clamp(17px, 3.2vw, 23px); font-weight: 700; }
.subtag  { color: var(--muted); margin-top: 8px; max-width: 62ch; }
.cursor { display: inline-block; width: 0.6em; height: 1.05em; background: var(--accent);
  vertical-align: -0.15em; margin-left: 2px; animation: blink 1.1s steps(1) infinite; }
@keyframes blink { 50% { opacity: 0; } }

.cta { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 24px; }

/* --- buttons -------------------------------------------------------------- */
.btn {
  font: inherit; cursor: pointer; display: inline-flex; align-items: center; gap: 8px;
  padding: 9px 16px; border-radius: 6px; border: 1px solid var(--border-lit);
  background: var(--panel); color: var(--fg-strong); border-bottom: 1px solid var(--border-lit);
}
.btn:hover { border-color: var(--accent); color: var(--accent); }
.btn.primary { background: var(--accent); color: #05070b; border-color: var(--accent); }
.btn.primary:hover { background: color-mix(in srgb, var(--accent) 84%, #fff); color: #05070b; }
:root[data-theme="light"] .btn.primary { color: #f6f2e7; }
.btn::before { content: "▸"; }
.btn.primary::before { content: "$"; }

/* --- headings ------------------------------------------------------------- */
h1, h2, h3, h4 { color: var(--fg-strong); line-height: 1.25; font-weight: 700; }
h1 { font-size: clamp(24px, 4vw, 32px); margin-bottom: 12px; }
h2 {
  font-size: clamp(19px, 3vw, 23px); margin: 40px 0 16px; padding-bottom: 8px;
  border-bottom: 1px dashed var(--border-lit); color: var(--accent);
}
h2::before { content: "## "; color: var(--dim); }
h3 { font-size: 17px; margin: 26px 0 10px; color: var(--accent2); }
h3::before { content: "### "; color: var(--dim); }
h4 { font-size: 15px; margin: 18px 0 8px; color: var(--fg-strong); }
h2 .anchor, h3 .anchor { color: var(--dim); margin-left: 8px; opacity: 0; border-bottom: none; }
h2:hover .anchor, h3:hover .anchor { opacity: 1; }

p { margin: 12px 0; max-width: 74ch; }
strong { color: var(--fg-strong); }
em { color: var(--amber); font-style: normal; }
small { color: var(--muted); font-size: 12.5px; }

/* inline code + keys */
code {
  background: var(--bg-inset); border: 1px solid var(--border);
  border-radius: 4px; padding: 1px 6px; font-size: 0.9em; color: var(--accent);
}
kbd {
  background: var(--panel); border: 1px solid var(--border-lit);
  border-bottom-width: 2px; border-radius: 4px; padding: 1px 6px;
  font-size: 0.85em; color: var(--fg-strong);
}

/* --- lists ---------------------------------------------------------------- */
ul, ol { margin: 12px 0; padding-left: 0; list-style: none; max-width: 74ch; }
ul li { padding-left: 22px; position: relative; margin: 7px 0; }
ul li::before { content: "▸"; color: var(--accent); position: absolute; left: 2px; }
ol { counter-reset: li; }
ol li { padding-left: 30px; position: relative; margin: 7px 0; counter-increment: li; }
ol li::before {
  content: counter(li) ".") ""; content: counter(li); color: var(--accent2);
  position: absolute; left: 2px; font-weight: 700;
}
li ul { margin: 6px 0; }
li ul li::before { content: "─"; color: var(--dim); }

/* --- code blocks ---------------------------------------------------------- */
.code {
  margin: 18px 0; border: 1px solid var(--border); border-radius: var(--radius);
  overflow: hidden; background: var(--bg-inset);
}
.code-head {
  display: flex; align-items: center; justify-content: space-between;
  padding: 7px 12px; background: var(--panel); border-bottom: 1px solid var(--border);
  color: var(--muted); font-size: 12px;
}
.code-head .name::before { content: "▚ "; color: var(--dim); }
.copy {
  font: inherit; font-size: 11.5px; cursor: pointer; color: var(--muted);
  background: transparent; border: 1px solid var(--border); border-radius: 4px; padding: 1px 8px;
}
.copy:hover { color: var(--accent); border-color: var(--border-lit); }
.copy.done { color: var(--accent); border-color: var(--accent); }
pre { padding: 15px 16px; overflow-x: auto; font-size: 13.5px; line-height: 1.6; }
pre code { background: none; border: none; padding: 0; color: var(--fg); }
/* shell prompt lines: <span class=p>$</span> */
.p  { color: var(--accent); user-select: none; }
.c  { color: var(--muted); }          /* comment  */
.k  { color: var(--magenta); }        /* keyword  */
.s  { color: var(--amber); }          /* string   */
.fn { color: var(--accent2); }        /* fn/ident */
.o  { color: var(--fg-strong); }      /* output   */

/* --- panels / cards ------------------------------------------------------- */
.panel {
  border: 1px solid var(--border); border-radius: var(--radius);
  background: var(--bg-alt); padding: 18px 20px; margin: 18px 0; position: relative;
}
.panel-title {
  position: absolute; top: -11px; left: 14px; background: var(--bg);
  padding: 0 8px; color: var(--accent); font-size: 12.5px; letter-spacing: 0.4px;
}
.panel-title::before { content: "╴"; color: var(--dim); }
.panel-title::after  { content: "╶"; color: var(--dim); }

.note, .warn, .tip {
  border-left: 3px solid var(--accent2); background: var(--bg-alt);
  padding: 12px 16px; margin: 18px 0; border-radius: 0 6px 6px 0;
}
.note::before, .warn::before, .tip::before {
  display: block; font-size: 12px; letter-spacing: 1px; margin-bottom: 4px; color: var(--accent2);
}
.note::before { content: "▚ NOTE"; }
.warn { border-left-color: var(--amber); }
.warn::before { content: "▚ HEADS UP"; color: var(--amber); }
.tip  { border-left-color: var(--accent); }
.tip::before  { content: "▚ TIP"; color: var(--accent); }

/* --- feature grid --------------------------------------------------------- */
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: 14px; margin: 20px 0; }
.card {
  border: 1px solid var(--border); border-radius: var(--radius);
  background: var(--bg-alt); padding: 16px 18px; transition: border-color 0.15s, transform 0.15s;
  display: block; color: inherit; border-bottom: 1px solid var(--border);
}
a.card:hover { border-color: var(--accent); transform: translateY(-2px); }
.card .glyph { color: var(--accent); font-size: 20px; margin-bottom: 8px; }
.card h4 { margin: 0 0 6px; color: var(--fg-strong); }
.card p { margin: 0; color: var(--muted); font-size: 13px; max-width: none; }
.card .more { color: var(--accent2); font-size: 12.5px; margin-top: 10px; display: inline-block; }
.card .more::after { content: " →"; }

/* --- ascii diagram -------------------------------------------------------- */
.ascii {
  display: block; white-space: pre; overflow-x: auto; color: var(--muted);
  background: var(--bg-inset); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 18px; font-size: 12.5px; line-height: 1.5; margin: 20px 0;
}
.ascii b { color: var(--accent); font-weight: 400; }
.ascii i { color: var(--accent2); font-style: normal; }
.ascii u { color: var(--amber); text-decoration: none; }

/* --- tables --------------------------------------------------------------- */
.tablewrap { overflow-x: auto; margin: 18px 0; border: 1px solid var(--border); border-radius: var(--radius); }
table { border-collapse: collapse; width: 100%; font-size: 13.5px; }
th, td { text-align: left; padding: 9px 14px; border-bottom: 1px solid var(--border); vertical-align: top; }
th { color: var(--accent); background: var(--panel); font-weight: 700; white-space: nowrap; }
tr:last-child td { border-bottom: none; }
tbody tr:hover { background: var(--bg-inset); }
td code { white-space: nowrap; }

/* --- step / prompt line --------------------------------------------------- */
.kv { color: var(--muted); }
.kv b { color: var(--fg-strong); font-weight: 400; }
.badge {
  display: inline-block; padding: 1px 8px; border-radius: 4px; font-size: 11.5px;
  border: 1px solid var(--border-lit); color: var(--muted); letter-spacing: 0.3px;
}
.badge.ok  { color: var(--accent);  border-color: color-mix(in srgb, var(--accent) 45%, var(--border)); }
.badge.new { color: var(--accent2); border-color: color-mix(in srgb, var(--accent2) 45%, var(--border)); }
.badge.man { color: var(--amber);   border-color: color-mix(in srgb, var(--amber) 45%, var(--border)); }

/* --- pipeline / flow chips ------------------------------------------------ */
.flow { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; margin: 18px 0; }
.flow .stage {
  border: 1px solid var(--border-lit); border-radius: 6px; padding: 6px 12px;
  background: var(--bg-alt); color: var(--fg-strong); white-space: nowrap;
}
.flow .arr { color: var(--accent); }

/* --- footer status bar ---------------------------------------------------- */
.foot {
  border-top: 1px solid var(--border); background: var(--panel); color: var(--muted);
  font-size: 12.5px; margin-top: 40px;
}
.foot-inner {
  max-width: var(--maxw); margin: 0 auto; padding: 12px 20px;
  display: flex; gap: 8px 18px; flex-wrap: wrap; align-items: center;
}
.foot .seg::before { content: "│ "; color: var(--dim); }
.foot .seg:first-child::before { content: ""; }
.foot .accent { color: var(--accent); }

/* keyboard hint bar (tui footer flourish) */
.keys { color: var(--dim); font-size: 12px; margin-top: 6px; }
.keys kbd { font-size: 11px; }

/* --- misc ----------------------------------------------------------------- */
hr { border: none; border-top: 1px dashed var(--border-lit); margin: 32px 0; }
.lead { font-size: 16px; color: var(--fg); max-width: 76ch; }
.center { text-align: center; }
.mt0 { margin-top: 0; }

/* --- responsive ----------------------------------------------------------- */
@media (max-width: 640px) {
  body { font-size: 14px; }
  .nav-links { width: 100%; margin-left: 0; }
  .term-body { padding: 16px; }
  main { padding: 26px 0 60px; }
}

/* --- reduced motion ------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; scroll-behavior: auto !important; transition: none !important; }
  .cursor { opacity: 1; }
}