/* kevy.golia.jp — shared stylesheet.
   Identity: an engineering drawing on paper. Paper-white ground,
   blueprint-blue line work, amber reserved for measured data.
   Monospace throughout: the site is a specification sheet, and the
   numbers are the product. No external fonts, no external images. */

:root {
  --paper: #fbfaf6;
  --paper-2: #f4f2ea;
  --ink: #1f2a37;
  --ink-soft: #51607280;
  --muted: #5b6a7d;
  --blue: #2456c0;
  --blue-deep: #16294e;
  --blue-line: rgba(36, 86, 192, 0.32);
  --blue-hair: rgba(36, 86, 192, 0.14);
  --blue-tint: rgba(36, 86, 192, 0.055);
  --amber: #b45309;
  --amber-bright: #d97706;
  --amber-tint: rgba(217, 119, 6, 0.08);
  --term-bg: #132242;
  --term-ink: #dbe6ff;
  --term-dim: #7e93c4;
  --mono: ui-monospace, "SF Mono", "Cascadia Mono", "Roboto Mono", Menlo,
    Consolas, "Liberation Mono", monospace;
  --max: 940px;
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--mono);
  font-size: 15px;
  line-height: 1.65;
  /* faint drafting grid, drawn in CSS */
  background-image:
    linear-gradient(var(--blue-tint) 1px, transparent 1px),
    linear-gradient(90deg, var(--blue-tint) 1px, transparent 1px);
  background-size: 28px 28px;
}

a { color: var(--blue); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }
a:focus-visible, button:focus-visible, input:focus-visible {
  outline: 2px solid var(--amber-bright);
  outline-offset: 2px;
}

code, pre { font-family: var(--mono); }

.wrap { max-width: var(--max); margin: 0 auto; padding: 0 20px; }

/* ---------- header ---------- */

header.site {
  border-bottom: 1px solid var(--blue-line);
  background: color-mix(in srgb, var(--paper) 88%, transparent);
  backdrop-filter: blur(4px);
  position: sticky; top: 0; z-index: 10;
}
header.site .wrap {
  display: flex; align-items: baseline; gap: 18px;
  padding-top: 12px; padding-bottom: 12px;
  flex-wrap: wrap;
}
.wordmark {
  font-weight: 700; font-size: 19px; letter-spacing: 0.04em;
  color: var(--blue-deep);
}
.wordmark a { color: inherit; }
.wordmark .cursor-block {
  display: inline-block; width: 0.55em; height: 1em;
  background: var(--amber-bright); vertical-align: text-bottom;
  margin-left: 2px;
}
nav.top { display: flex; gap: 16px; flex-wrap: wrap; font-size: 13.5px; }
.lang { margin-left: auto; font-size: 12.5px; color: var(--muted); }
.lang a { color: var(--muted); }
.lang strong { color: var(--amber); font-weight: 700; }
.lang span.sep { padding: 0 4px; color: var(--blue-hair); }

/* ---------- section furniture (drafting title strips) ---------- */

section.sheet { border-top: 1px solid var(--blue-line); padding: 44px 0 52px; }
section.sheet:first-of-type { border-top: 0; }
.strip {
  display: flex; align-items: baseline; gap: 12px;
  font-size: 11.5px; letter-spacing: 0.18em; text-transform: uppercase;
  color: var(--blue); margin-bottom: 22px;
}
.strip::after {
  content: ""; flex: 1; border-top: 1px solid var(--blue-hair);
  transform: translateY(-3px);
}
h1 { font-size: clamp(26px, 4.6vw, 40px); line-height: 1.22; margin: 0 0 14px; color: var(--blue-deep); letter-spacing: -0.01em; }
h2 { font-size: 21px; margin: 0 0 12px; color: var(--blue-deep); }
p.lead { font-size: 16.5px; max-width: 44em; color: var(--ink); }
p.note, .note { font-size: 12.5px; color: var(--muted); }
.amber { color: var(--amber); }

/* ---------- hero ---------- */

.hero { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 36px; align-items: start; padding-top: 54px; }
@media (max-width: 820px) { .hero { grid-template-columns: 1fr; } }

.install {
  margin-top: 26px; border: 1px solid var(--blue-line); background: var(--paper-2);
}
.install .cap {
  font-size: 11px; letter-spacing: 0.16em; text-transform: uppercase;
  color: var(--blue); padding: 7px 14px; border-bottom: 1px solid var(--blue-hair);
}
.install pre { margin: 0; padding: 14px; font-size: 13.5px; overflow-x: auto; }
.install .c { color: var(--muted); }

/* ---------- terminal (signature element) ---------- */

.term {
  background: var(--term-bg); color: var(--term-ink);
  border: 1px solid var(--blue-deep); border-radius: 6px;
  box-shadow: 6px 6px 0 var(--blue-hair);
  overflow: hidden; font-size: 13.5px;
}
.term .bar {
  display: flex; gap: 6px; padding: 9px 12px;
  border-bottom: 1px solid rgba(219, 230, 255, 0.14);
}
.term .bar i {
  width: 10px; height: 10px; border-radius: 50%;
  border: 1px solid var(--term-dim); display: inline-block;
}
.term .bar i.a { background: var(--amber-bright); border-color: var(--amber-bright); }
.term pre { margin: 0; padding: 16px 16px 18px; line-height: 1.75; overflow-x: auto; }
.term .p { color: var(--amber-bright); }
.term .r { color: var(--term-dim); }
.term .out { color: #9fd0a9; }

/* pure-CSS typing: each line reveals by width steps, in sequence */
.tline {
  display: block; white-space: nowrap; overflow: hidden; width: 0;
  animation: typing 1.1s steps(30, end) forwards;
}
.tline.t1 { animation-delay: 0.4s; }
.tline.t2 { animation-delay: 1.9s; animation-duration: 0.9s; }
.tline.t3 { animation-delay: 3.2s; animation-duration: 1.3s; }
.tline.t4 { animation-delay: 4.9s; animation-duration: 0.2s; }
.tline.t5 { animation-delay: 5.4s; animation-duration: 1.3s; }
.tline.t6 { animation-delay: 7.0s; animation-duration: 0.2s; }
@keyframes typing { from { width: 0; } to { width: 100%; } }
.caret {
  display: inline-block; width: 0.55em; height: 1.05em;
  background: var(--term-ink); vertical-align: text-bottom;
  opacity: 0; animation: caret-on 0.1s linear 7.4s forwards, blink 1.1s step-end 7.4s infinite;
}
@keyframes blink { 50% { background: transparent; } }
@keyframes caret-on { to { opacity: 1; } }
@media (prefers-reduced-motion: reduce) {
  .tline { animation: none; width: 100%; }
  .caret { animation: none; opacity: 1; }
}

/* ---------- arena table ---------- */

.tablewrap { overflow-x: auto; border: 1px solid var(--blue-line); background: var(--paper-2); }
table.arena { border-collapse: collapse; width: 100%; font-size: 13.5px; min-width: 640px; }
table.arena th, table.arena td { padding: 10px 14px; text-align: right; border-top: 1px solid var(--blue-hair); }
table.arena th { font-size: 11px; letter-spacing: 0.14em; text-transform: uppercase; color: var(--blue); border-top: 0; }
table.arena th:first-child, table.arena td:first-child { text-align: left; }
table.arena td:first-child { color: var(--blue-deep); }
table.arena .num { font-variant-numeric: tabular-nums; white-space: nowrap; }
table.arena .sd { color: var(--muted); font-size: 11.5px; }
table.arena tr.kevy { background: var(--amber-tint); }
table.arena tr.kevy td { color: var(--amber); font-weight: 700; }
/* line-art measurement gauge */
.gauge { display: inline-block; width: 120px; height: 8px; border: 1px solid var(--blue-line); vertical-align: middle; }
.gauge i { display: block; height: 100%; background: var(--blue-line); }
tr.kevy .gauge { border-color: var(--amber-bright); }
tr.kevy .gauge i { background: var(--amber-bright); }

.mult { display: flex; gap: 26px; flex-wrap: wrap; margin: 20px 0 8px; }
.mult div { border-left: 3px solid var(--amber-bright); padding: 2px 0 2px 12px; }
.mult b { display: block; font-size: 24px; color: var(--amber); font-variant-numeric: tabular-nums; }
.mult span { font-size: 12.5px; color: var(--muted); }

/* ---------- capability matrix ---------- */

.matrix { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1px; background: var(--blue-hair); border: 1px solid var(--blue-line); }
@media (max-width: 700px) { .matrix { grid-template-columns: 1fr; } }
.matrix div { background: var(--paper); padding: 14px 16px; }
.matrix b { color: var(--blue-deep); display: block; font-size: 14px; }
.matrix b::before { content: "▣ "; color: var(--amber-bright); }
.matrix span { font-size: 13px; color: var(--muted); }

/* ---------- demo card / link chips ---------- */

.btn {
  display: inline-block; border: 1px solid var(--blue); color: var(--blue);
  padding: 10px 22px; font-size: 14px; font-weight: 700;
  box-shadow: 4px 4px 0 var(--blue-hair); background: var(--paper);
}
.btn:hover { background: var(--blue); color: var(--paper); text-decoration: none; }
.btn.amber { border-color: var(--amber-bright); color: var(--amber); box-shadow: 4px 4px 0 var(--amber-tint); }
.btn.amber:hover { background: var(--amber-bright); color: var(--paper); }

.chips { display: flex; gap: 12px; flex-wrap: wrap; }
.chip {
  display: inline-flex; border: 1px solid var(--blue-line); font-size: 13px;
  background: var(--paper);
}
.chip:hover { text-decoration: none; border-color: var(--blue); }
.chip b { background: var(--blue-deep); color: var(--paper); padding: 6px 10px; font-weight: 700; }
.chip span { padding: 6px 10px; color: var(--ink); }

/* ---------- footer ---------- */

footer.site { border-top: 1px solid var(--blue-line); padding: 26px 0 44px; font-size: 12.5px; color: var(--muted); }
footer.site .wrap { display: flex; gap: 18px; flex-wrap: wrap; }
footer.site .lang { margin-left: auto; }

/* ---------- demo page ---------- */

.repl {
  background: var(--term-bg); color: var(--term-ink);
  border: 1px solid var(--blue-deep); border-radius: 6px;
  box-shadow: 6px 6px 0 var(--blue-hair);
  display: flex; flex-direction: column;
  height: min(62vh, 560px);
  font-size: 13.5px;
}
.repl .bar { display: flex; align-items: center; gap: 10px; padding: 9px 12px; border-bottom: 1px solid rgba(219, 230, 255, 0.14); }
.repl .bar .dot { width: 10px; height: 10px; border-radius: 50%; border: 1px solid var(--term-dim); }
.repl .bar .dot.on { background: #9fd0a9; border-color: #9fd0a9; }
.repl .bar .stat { font-size: 12px; color: var(--term-dim); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
#log { flex: 1; overflow-y: auto; margin: 0; padding: 14px 16px; line-height: 1.7; }
#log .in { color: var(--term-ink); }
#log .in::before { content: "kevy> "; color: var(--amber-bright); }
#log .ok { color: #9fd0a9; }
#log .err { color: #f2a0a0; }
#log .ev { color: #8fc7f2; }
#log .dim { color: var(--term-dim); }
#log div { white-space: pre-wrap; word-break: break-word; }
.repl form { display: flex; border-top: 1px solid rgba(219, 230, 255, 0.14); }
.repl form .ps1 { padding: 12px 0 12px 16px; color: var(--amber-bright); }
#cmd {
  flex: 1; background: transparent; border: 0; color: var(--term-ink);
  font-family: var(--mono); font-size: 13.5px; padding: 12px 16px 12px 8px;
}
#cmd:focus { outline: none; }

.guides { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 20px; margin-top: 28px; }
@media (max-width: 700px) { .guides { grid-template-columns: 1fr; } }
.guide { border: 1px solid var(--blue-line); background: var(--paper-2); padding: 16px 18px; }
.guide h3 { margin: 0 0 8px; font-size: 14.5px; color: var(--blue-deep); }
.guide h3::before { content: "› "; color: var(--amber-bright); }
.guide p, .guide ol { font-size: 13px; color: var(--muted); margin: 8px 0; }
.guide ol { padding-left: 20px; }
.guide code { background: var(--paper); border: 1px solid var(--blue-hair); padding: 1px 5px; font-size: 12.5px; color: var(--blue-deep); }