/* ============================================================
   MRPH·LAB — amber-phosphor / SIGINT bench aesthetic (v2.1)
   Palette:
     --ink    #0A0E12  deep blue-black (background)
     --panel  #101820  raised surfaces
     --line   #1E2A33  hairlines
     --amber  #FFB000  phosphor primary
     --amber2 #FFD37A  phosphor bright
     --trace  #6FC2B4  waterfall trace (used sparingly)
     --text   #C7D3DB  body
     --dim    #66788A  secondary
   ============================================================ */

:root {
  --ink: #0A0E12;
  --panel: #101820;
  --line: #1E2A33;
  --amber: #FFB000;
  --amber2: #FFD37A;
  --trace: #6FC2B4;
  --text: #C7D3DB;
  --dim: #66788A;
  --mono: "IBM Plex Mono", ui-monospace, "Cascadia Mono", Menlo, monospace;
  --sans: "IBM Plex Sans", system-ui, -apple-system, sans-serif;
  --wrap: 1080px;
}

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

body {
  margin: 0;
  background: var(--ink);
  color: var(--text);
  font-family: var(--sans);
  font-size: 1rem;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

::selection { background: var(--amber); color: var(--ink); }

.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 24px; }

a { color: inherit; }
a:focus-visible, button:focus-visible, input:focus-visible {
  outline: 2px solid var(--amber);
  outline-offset: 3px;
}

/* Anchored sections stop hiding under the sticky header */
section[id] { scroll-margin-top: 72px; }
.article h2[id] { scroll-margin-top: 84px; }

/* Skip link: invisible until keyboard-focused */
.skip {
  position: absolute; left: -9999px; top: 0; z-index: 100;
  background: var(--amber); color: var(--ink);
  font-family: var(--mono); font-size: 0.8rem; font-weight: 600;
  padding: 10px 16px; border-radius: 0 0 4px 0; text-decoration: none;
}
.skip:focus { left: 0; }

/* faint CRT scanline wash over everything */
.scanline {
  position: fixed; inset: 0; z-index: 0; pointer-events: none;
  background: repeating-linear-gradient(
    to bottom, transparent 0 2px, rgba(255, 176, 0, 0.015) 2px 3px);
}

/* ---------------- top bar ---------------- */
.topbar {
  position: sticky; top: 0; z-index: 10;
  background: rgba(10, 14, 18, 0.88); /* fallback */
  background: color-mix(in srgb, var(--ink) 88%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.topbar-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 56px;
}
.callsign {
  font-family: var(--mono); font-weight: 600; letter-spacing: 0.08em;
  color: var(--amber); text-decoration: none; font-size: 0.95rem;
}
.callsign-dot { color: var(--dim); }
.nav { display: flex; gap: 26px; }
.nav a {
  font-family: var(--mono); font-size: 0.8rem; letter-spacing: 0.06em;
  color: var(--dim); text-decoration: none; text-transform: uppercase;
  transition: color 140ms ease;
}
.nav a:hover { color: var(--amber2); }
.nav a[aria-current="true"] { color: var(--amber); }

/* ---------------- hero ---------------- */
.hero {
  position: relative; z-index: 1;
  display: grid; grid-template-columns: 1.05fr 0.95fr; gap: 48px;
  align-items: center; padding-top: 88px; padding-bottom: 96px;
}
.eyebrow {
  font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.22em;
  color: var(--dim); text-transform: uppercase; margin: 0 0 18px;
}
.eyebrow::before { content: "▮ "; color: var(--amber); }

.hero h1 {
  font-family: var(--mono); font-weight: 600;
  font-size: clamp(1.9rem, 4.2vw, 3.1rem);
  line-height: 1.14; letter-spacing: -0.02em;
  margin: 0 0 20px; color: #E8EEF2;
}
.hero h1 em { font-style: italic; color: var(--amber); }

.lede { max-width: 46ch; color: var(--text); margin: 0 0 30px; }

.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; }
.btn {
  font-family: var(--mono); font-size: 0.85rem; letter-spacing: 0.04em;
  text-decoration: none; padding: 12px 22px; border-radius: 3px;
  transition: transform 140ms ease, background 140ms ease, color 140ms ease,
              border-color 140ms ease;
  display: inline-block;
}
.btn-solid { background: var(--amber); color: var(--ink); font-weight: 600; }
.btn-solid:hover { background: var(--amber2); transform: translateY(-1px); }
.btn-ghost { border: 1px solid var(--line); color: var(--amber2); }
.btn-ghost:hover { border-color: var(--amber); transform: translateY(-1px); }

/* ---------------- terminal (signature) ---------------- */
.term {
  border: 1px solid var(--line); border-radius: 6px; overflow: hidden;
  background: var(--panel);
  box-shadow: 0 0 0 1px rgba(255,176,0,0.04), 0 24px 60px rgba(0,0,0,0.5);
}
.term-chrome {
  display: flex; align-items: center; justify-content: space-between;
  padding: 8px 14px; border-bottom: 1px solid var(--line);
  background: #0C1219;
}
.term-title {
  font-family: var(--mono); font-size: 0.75rem; color: var(--dim);
  letter-spacing: 0.05em;
}
.term-waterfall { display: block; opacity: 0.85; }

.term-screen {
  padding: 16px 16px 14px; min-height: 300px; max-height: 340px;
  overflow-y: auto; cursor: text;
  font-family: var(--mono); font-size: 0.83rem; line-height: 1.7;
}
.term-screen::-webkit-scrollbar { width: 8px; }
.term-screen::-webkit-scrollbar-thumb { background: var(--line); border-radius: 4px; }

#termOut .t-line { white-space: pre-wrap; word-break: break-word; }
.t-cmd  { color: var(--amber2); }
.t-out  { color: var(--text); }
.t-dim  { color: var(--dim); }
.t-key  { color: var(--trace); }

.term-inline { display: flex; align-items: baseline; }
.term-prompt { color: var(--amber); margin-right: 8px; }
.term-input {
  /* Width is set from JS so the block caret rides the end of the text.
     Native caret hidden — the fake one is the caret. */
  width: 1ch; min-width: 1ch; max-width: 100%;
  background: transparent; border: none; color: var(--amber2);
  font: inherit; caret-color: transparent; padding: 0;
}
.term-input:focus { outline: none; }
.term-caret {
  width: 8px; height: 1.05em; background: var(--amber);
  animation: blink 1.1s steps(1) infinite; align-self: center;
  flex: none;
}
@keyframes blink { 50% { opacity: 0; } }

.term-hint {
  margin: 0; padding: 6px 16px 10px;
  font-family: var(--mono); font-size: 0.68rem; letter-spacing: 0.08em;
  color: var(--dim); text-transform: uppercase;
  border-top: 1px dashed var(--line);
}

/* ---------------- section bands ---------------- */
.band { position: relative; z-index: 1; padding: 88px 0; border-top: 1px solid var(--line); }
.band-alt { background: #0C1117; }

.band-head { margin-bottom: 44px; }
.band h2 {
  font-family: var(--mono); font-weight: 600; letter-spacing: -0.01em;
  font-size: clamp(1.5rem, 3vw, 2.1rem); margin: 0 0 10px; color: #E8EEF2;
}
.band-sub { color: var(--dim); max-width: 56ch; margin: 0; }

/* ---------------- writing ledger ---------------- */
.ledger { list-style: none; margin: 0; padding: 0; border-top: 1px solid var(--line); }
.ledger-row { border-bottom: 1px solid var(--line); }
.ledger-link {
  display: grid; grid-template-columns: 72px 1fr 32px; gap: 20px;
  align-items: center; padding: 22px 6px; text-decoration: none;
  transition: background 140ms ease;
}
.ledger-link:hover { background: rgba(255,176,0,0.045); }
.ledger-freq {
  font-family: var(--mono); font-size: 0.75rem; color: var(--dim);
  letter-spacing: 0.1em;
}
.ledger-link:hover .ledger-freq { color: var(--amber); }
.ledger-title { display: block; color: #E4EAEF; font-weight: 500; margin-bottom: 4px; }
.ledger-meta { display: block; font-family: var(--mono); font-size: 0.74rem; color: var(--dim); letter-spacing: 0.03em; }
.ledger-go { color: var(--dim); font-family: var(--mono); transition: transform 140ms ease, color 140ms ease; }
.ledger-link:hover .ledger-go { color: var(--amber); transform: translateX(4px); }

/* ---------------- credentials ---------------- */
.creds { list-style: none; margin: 0 0 48px; padding: 0; border-top: 1px solid var(--line); }
.cred {
  display: grid; grid-template-columns: 130px 1fr; gap: 20px;
  align-items: baseline; padding: 20px 6px;
  border-bottom: 1px solid var(--line);
}
.cred-status {
  font-family: var(--mono); font-size: 0.68rem; letter-spacing: 0.14em;
  padding: 3px 0; text-align: center; border-radius: 3px;
  border: 1px solid var(--line); color: var(--dim);
}
.cred[data-status="earned"] .cred-status {
  border-color: var(--amber); color: var(--ink); background: var(--amber);
  font-weight: 600;
}
.cred[data-status="progress"] .cred-status {
  border-color: rgba(255,176,0,0.5); color: var(--amber2);
}
.cred-body h3 {
  font-family: var(--sans); font-size: 1rem; font-weight: 500;
  color: #E4EAEF; margin: 0 0 2px;
}
.cred-body p {
  font-family: var(--mono); font-size: 0.74rem; color: var(--dim);
  margin: 0; letter-spacing: 0.03em;
}

.honors-title {
  font-family: var(--mono); font-size: 0.9rem; font-weight: 600;
  color: var(--amber2); margin: 0 0 16px; letter-spacing: 0.04em;
  text-transform: uppercase;
}
.honors-list { list-style: none; margin: 0; padding: 0; }
.honors-list li {
  display: flex; gap: 14px; align-items: baseline;
  padding: 10px 0; border-bottom: 1px dashed var(--line);
  font-size: 0.94rem;
}
.honors-tag {
  font-family: var(--mono); font-size: 0.64rem; letter-spacing: 0.12em;
  color: var(--trace); flex: none; width: 78px;
}

/* ---------------- lab cards ---------------- */
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.card {
  border: 1px solid var(--line); border-radius: 6px; padding: 26px 24px;
  background: var(--panel);
  transition: border-color 160ms ease, transform 160ms ease;
}
.card:hover { border-color: rgba(255,176,0,0.4); transform: translateY(-2px); }
.card h3 {
  font-family: var(--mono); font-size: 0.95rem; font-weight: 600;
  color: var(--amber2); margin: 0 0 12px; letter-spacing: 0.02em;
}
.card p { margin: 0; font-size: 0.94rem; color: var(--text); }

/* ---------------- game ---------------- */
.game-split { display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 48px; align-items: center; }
.game-sub { margin-bottom: 26px; }
.game-art {
  font-family: var(--mono); font-size: 0.85rem; line-height: 1.5;
  color: var(--trace); background: var(--panel);
  border: 1px solid var(--line); border-radius: 6px;
  padding: 26px; margin: 0; overflow-x: auto;
  text-shadow: 0 0 12px rgba(111,194,180,0.35);
}

/* ---------------- contact ---------------- */
.contact-inner { text-align: center; max-width: 620px; }
.contact-inner .band-sub { margin: 0 auto 30px; }
.contact-alt { margin-top: 18px; font-family: var(--mono); font-size: 0.8rem; color: var(--dim); }
.txt-link { color: var(--amber2); text-decoration-color: var(--line); }
.txt-link:hover { text-decoration-color: var(--amber); }

/* ---------------- footer ---------------- */
.foot { border-top: 1px solid var(--line); padding: 26px 0; }
.foot-inner {
  display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap;
  font-family: var(--mono); font-size: 0.72rem; color: var(--dim);
  letter-spacing: 0.04em;
}
.foot-sig { color: var(--amber); }

/* ---------------- scroll reveal (JS adds .in when visible) ---------------- */
.band .wrap > * { opacity: 1; }
.reveal { opacity: 0; transform: translateY(14px); transition: opacity 480ms ease, transform 480ms ease; }
.reveal.in { opacity: 1; transform: none; }

/* ============================================================
   ARTICLE PAGES
   ============================================================ */

/* reading progress bar, width driven by article.js */
.readbar {
  position: fixed; top: 0; left: 0; z-index: 60;
  height: 2px; width: 0; background: var(--amber);
  box-shadow: 0 0 10px rgba(255,176,0,0.55);
}

.article {
  position: relative; z-index: 1;
  max-width: 780px; padding-top: 64px; padding-bottom: 96px;
  counter-reset: sec;
}

.art-head { margin-bottom: 8px; }
.art-head h1 {
  font-family: var(--mono); font-weight: 600;
  font-size: clamp(1.6rem, 3.6vw, 2.35rem);
  line-height: 1.22; letter-spacing: -0.015em;
  color: #E8EEF2; margin: 0 0 18px;
}
.art-standfirst {
  font-size: 1.06rem; color: var(--text); max-width: 62ch; margin: 0;
}

/* table of contents, styled like an ls listing */
.toc {
  border: 1px dashed var(--line); border-radius: 6px;
  padding: 18px 24px; margin: 36px 0 0;
}
.toc-title {
  font-family: var(--mono); font-size: 0.68rem; letter-spacing: 0.18em;
  text-transform: uppercase; color: var(--dim); margin: 0 0 10px;
}
.toc ol {
  margin: 0; padding-left: 24px;
  font-family: var(--mono); font-size: 0.82rem; line-height: 1.95;
}
.toc a { color: var(--dim); text-decoration: none; transition: color 140ms ease; }
.toc a:hover { color: var(--amber2); }

/* body typography */
.article h2 {
  font-family: var(--mono); font-weight: 600;
  font-size: 1.28rem; color: #E8EEF2;
  margin: 60px 0 16px; letter-spacing: -0.01em;
  counter-increment: sec;
}
.article h2::before {
  content: counter(sec, decimal-leading-zero) " · ";
  color: var(--amber);
}
.article h3 {
  font-family: var(--mono); font-size: 1rem; font-weight: 600;
  color: var(--amber2); margin: 34px 0 10px;
}
.article p { margin: 0 0 18px; }
.article ul, .article ol { margin: 0 0 18px; padding-left: 26px; }
.article li { margin-bottom: 6px; }
.article a { color: var(--amber2); text-decoration-color: var(--line); }
.article a:hover { text-decoration-color: var(--amber); }
.article strong { color: #E8EEF2; font-weight: 600; }

.article p code, .article li code {
  font-family: var(--mono); font-size: 0.85em;
  background: var(--panel); border: 1px solid var(--line);
  border-radius: 3px; padding: 1px 6px; color: var(--amber2);
}

/* code blocks */
.codeblock {
  margin: 26px 0; border: 1px solid var(--line); border-radius: 6px;
  background: var(--panel); overflow: hidden;
}
.codeblock figcaption {
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  padding: 7px 14px; border-bottom: 1px solid var(--line);
  background: #0C1219;
  font-family: var(--mono); font-size: 0.68rem; letter-spacing: 0.12em;
  text-transform: uppercase; color: var(--dim);
}
.codeblock pre { margin: 0; padding: 18px; overflow-x: auto; }
.codeblock code {
  font-family: var(--mono); font-size: 0.8rem; line-height: 1.7;
  color: var(--text);
}
.copy-btn {
  font-family: var(--mono); font-size: 0.64rem; letter-spacing: 0.1em;
  text-transform: uppercase; color: var(--dim);
  background: transparent; border: 1px solid var(--line); border-radius: 3px;
  padding: 3px 10px; cursor: pointer; flex: none;
  transition: color 140ms ease, border-color 140ms ease;
}
.copy-btn:hover { color: var(--amber); border-color: var(--amber); }

/* syntax tokens (applied by article.js) */
.tok-c { color: var(--dim); font-style: italic; }
.tok-s { color: var(--trace); }
.tok-k { color: var(--amber); }
.tok-n { color: var(--amber2); }
.tok-v { color: var(--amber2); }

/* callouts */
.callout {
  border: 1px solid rgba(255,176,0,0.3); border-left: 3px solid var(--amber);
  background: rgba(255,176,0,0.04); border-radius: 4px;
  padding: 16px 20px; margin: 26px 0; font-size: 0.93rem;
}
.callout-tag {
  display: block; font-family: var(--mono); font-size: 0.64rem;
  letter-spacing: 0.16em; color: var(--amber); margin-bottom: 8px;
  text-transform: uppercase;
}
.callout p { margin: 0; }
.callout p + p { margin-top: 10px; }

/* checklists */
.checklist { list-style: none; padding: 0; margin: 0 0 18px; }
.checklist li {
  padding: 9px 0 9px 40px; position: relative; margin: 0;
  border-bottom: 1px dashed var(--line); font-size: 0.95rem;
}
.checklist li::before {
  content: "[ ]"; position: absolute; left: 0; top: 9px;
  font-family: var(--mono); color: var(--amber); font-size: 0.85rem;
}

/* prev / next footer */
.art-foot {
  margin-top: 72px; padding-top: 26px; border-top: 1px solid var(--line);
  display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap;
  font-family: var(--mono); font-size: 0.8rem;
}
.art-foot a { color: var(--dim); text-decoration: none; transition: color 140ms ease; }
.art-foot a:hover { color: var(--amber2); }

/* ============================================================
   404 PAGE
   ============================================================ */
.lost {
  position: relative; z-index: 1;
  min-height: calc(100vh - 160px);
  display: grid; place-content: center; text-align: center;
  padding-top: 48px; padding-bottom: 48px;
}
.lost-art {
  font-family: var(--mono); font-size: 0.85rem; line-height: 1.5;
  color: var(--trace); margin: 0 auto 28px;
  text-shadow: 0 0 12px rgba(111,194,180,0.35);
}
.lost h1 {
  font-family: var(--mono); font-weight: 600; letter-spacing: -0.01em;
  font-size: clamp(1.5rem, 3vw, 2.1rem); color: #E8EEF2; margin: 0 0 12px;
}
.lost p { color: var(--dim); max-width: 46ch; margin: 0 auto 30px; }

/* ---------------- responsive ---------------- */
@media (max-width: 900px) {
  .hero { grid-template-columns: 1fr; padding-top: 56px; padding-bottom: 64px; }
  .grid-3 { grid-template-columns: 1fr; }
  .game-split { grid-template-columns: 1fr; }
  .band { padding: 64px 0; }
}
@media (max-width: 560px) {
  .nav { gap: 14px; }
  .nav a { font-size: 0.66rem; }
  .ledger-link { grid-template-columns: 1fr 24px; }
  .ledger-freq { display: none; }
  .cred { grid-template-columns: 1fr; gap: 8px; }
  .cred-status { justify-self: start; padding: 3px 10px; }
  .article { padding-top: 44px; }
  .codeblock pre { padding: 14px; }
  .codeblock code { font-size: 0.74rem; }
}

/* ---------------- reduced motion ---------------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .term-caret { animation: none; }
  .btn, .card, .ledger-go { transition: none; }
  .reveal { opacity: 1; transform: none; transition: none; }
}

/* ---------------- print (articles come out clean on paper) ---------------- */
@media print {
  .scanline, .topbar, .readbar, .foot, .art-foot, .copy-btn, .skip, .toc { display: none !important; }
  body { background: #fff; color: #111; }
  .article { max-width: 100%; padding-top: 0; }
  .art-head h1, .article h2, .article h3, .article strong { color: #000; }
  .art-standfirst, .article p, .article li { color: #111; }
  .article a { color: #111; text-decoration: none; }
  .eyebrow { color: #555; }
  .eyebrow::before { color: #555; }
  .article h2::before { color: #555; }
  .codeblock { border-color: #bbb; background: #fff; }
  .codeblock figcaption { background: #fff; border-color: #bbb; color: #555; }
  .codeblock code, .tok-c, .tok-s, .tok-k, .tok-n, .tok-v { color: #111; }
  .article p code, .article li code { background: #fff; border-color: #bbb; color: #111; }
  .callout { background: #fff; border-color: #999; }
  .callout-tag { color: #333; }
  .checklist li::before { color: #333; }
}