/* ============================================================
   AI Tester Blueprint 2.x · Showcase design system
   The Testing Academy · Pramod Dutta
   Aesthetic: blueprint field-manual. Cream paper, ink navy,
   vermilion accent, faint drafting grid. Light theme only.
   ============================================================ */

:root {
  --paper: #f7f3ea;
  --paper-2: #efe9db;
  --card: #fffdf7;
  --ink: #1b2437;
  --ink-soft: #4a5468;
  --ink-faint: #8b93a5;
  --line: #d9d2c0;
  --line-strong: #b9b09a;
  --accent: #e4572e;       /* vermilion */
  --accent-dark: #c43f1a;
  --blue: #1f4e8c;         /* blueprint ink */
  --blue-soft: #dfe8f4;
  --green: #2e7d5b;
  --green-soft: #e0efe7;
  --amber: #b97d10;
  --amber-soft: #f6ecd4;
  --code-bg: #20283a;
  --code-ink: #e8ecf5;
  --radius: 14px;
  --shadow: 0 1px 2px rgba(27,36,55,.06), 0 8px 24px -12px rgba(27,36,55,.18);
  --shadow-lift: 0 2px 4px rgba(27,36,55,.08), 0 18px 40px -16px rgba(27,36,55,.28);
  --font-display: "Fraunces", Georgia, serif;
  --font-body: "Instrument Sans", "Helvetica Neue", sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, monospace;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  background: var(--paper);
  color: var(--ink);
  line-height: 1.6;
  font-size: 16.5px;
  /* faint drafting grid */
  background-image:
    repeating-linear-gradient(0deg, transparent 0 31px, rgba(31,78,140,.05) 31px 32px),
    repeating-linear-gradient(90deg, transparent 0 31px, rgba(31,78,140,.05) 31px 32px);
}

::selection { background: var(--accent); color: #fff; }

/* ---------- top bar ---------- */
.topbar {
  position: sticky; top: 0; z-index: 50;
  background: rgba(247,243,234,.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
  display: flex; align-items: center; gap: 14px;
  padding: 12px 28px;
}
.topbar .wordmark {
  font-family: var(--font-display);
  font-weight: 700; font-size: 1.05rem; letter-spacing: .01em;
  color: var(--ink); text-decoration: none; white-space: nowrap;
}
.topbar .wordmark b { color: var(--accent); font-weight: 700; }
.topbar .crumb {
  font-family: var(--font-mono); font-size: .72rem;
  color: var(--ink-faint); text-transform: uppercase; letter-spacing: .12em;
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.topbar .spacer { flex: 1; }
.topbar .byline {
  font-family: var(--font-mono); font-size: .7rem; color: var(--ink-soft);
  letter-spacing: .06em; white-space: nowrap;
}
.topbar .byline a { color: var(--blue); text-decoration: none; }

/* ---------- badges & chips ---------- */
.badge {
  display: inline-flex; align-items: center; gap: 6px;
  font-family: var(--font-mono); font-size: .7rem; font-weight: 600;
  letter-spacing: .14em; text-transform: uppercase;
  color: var(--blue); background: var(--blue-soft);
  border: 1px solid rgba(31,78,140,.25);
  padding: 4px 10px; border-radius: 999px;
}
.badge.accent { color: var(--accent-dark); background: #fbe3d9; border-color: rgba(196,63,26,.3); }
.badge.green  { color: var(--green); background: var(--green-soft); border-color: rgba(46,125,91,.3); }

.chip {
  display: inline-block; font-family: var(--font-mono); font-size: .72rem;
  color: var(--ink-soft); background: var(--paper-2);
  border: 1px solid var(--line-strong);
  padding: 3px 10px; border-radius: 6px; margin: 0 6px 6px 0;
}

/* ---------- hero (project pages) ---------- */
.hero { max-width: 1060px; margin: 0 auto; padding: 64px 28px 28px; }
.hero .kicker { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 18px; }
.hero h1 {
  font-family: var(--font-display); font-weight: 640;
  font-size: clamp(2.1rem, 4.6vw, 3.4rem); line-height: 1.06;
  letter-spacing: -.015em; margin-bottom: 16px;
}
.hero h1 em { font-style: italic; color: var(--accent); }
.hero .lede { font-size: 1.12rem; color: var(--ink-soft); max-width: 46em; }

/* ---------- layout ---------- */
.wrap { max-width: 1060px; margin: 0 auto; padding: 0 28px 80px; }
section.block { margin-top: 44px; }
.block > h2 {
  font-family: var(--font-display); font-size: 1.5rem; font-weight: 620;
  margin-bottom: 6px; display: flex; align-items: baseline; gap: 12px;
}
.block > h2 .idx {
  font-family: var(--font-mono); font-size: .8rem; font-weight: 600;
  color: var(--accent); letter-spacing: .08em;
}
.block > p.sub { color: var(--ink-soft); margin-bottom: 18px; max-width: 52em; }

.card {
  background: var(--card); border: 1px solid var(--line);
  border-radius: var(--radius); box-shadow: var(--shadow);
  padding: 22px 24px;
}

.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
@media (max-width: 820px) { .grid-2, .grid-3 { grid-template-columns: 1fr; } }

/* ---------- io table ---------- */
.io { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
@media (max-width: 820px) { .io { grid-template-columns: 1fr; } }
.io .card h3 {
  font-family: var(--font-mono); font-size: .72rem; letter-spacing: .16em;
  text-transform: uppercase; margin-bottom: 12px;
}
.io .card.in h3 { color: var(--blue); }
.io .card.out h3 { color: var(--green); }
.io ul { list-style: none; }
.io li {
  padding: 7px 0 7px 22px; position: relative;
  border-bottom: 1px dashed var(--line); font-size: .95rem;
}
.io li:last-child { border-bottom: 0; }
.io li::before {
  content: "→"; position: absolute; left: 0; font-family: var(--font-mono);
  color: var(--accent); font-size: .85rem;
}

/* ---------- workflow steps ---------- */
.steps { counter-reset: step; display: grid; gap: 10px; }
.step {
  counter-increment: step;
  background: var(--card); border: 1px solid var(--line); border-radius: 10px;
  padding: 14px 16px 14px 58px; position: relative; font-size: .97rem;
}
.step::before {
  content: counter(step, decimal-leading-zero);
  position: absolute; left: 16px; top: 50%; transform: translateY(-50%);
  font-family: var(--font-mono); font-weight: 600; font-size: .8rem;
  color: var(--accent);
  border: 1.5px solid var(--accent); border-radius: 8px; padding: 2px 6px;
  background: #fff;
}

/* ---------- architecture diagram ---------- */
.arch {
  background: var(--blue); border-radius: var(--radius);
  padding: 26px; overflow-x: auto; box-shadow: var(--shadow);
  background-image:
    repeating-linear-gradient(0deg, transparent 0 23px, rgba(255,255,255,.08) 23px 24px),
    repeating-linear-gradient(90deg, transparent 0 23px, rgba(255,255,255,.08) 23px 24px);
}
.arch-flow {
  display: flex; align-items: stretch; gap: 0; min-width: 640px;
  justify-content: center; flex-wrap: nowrap;
}
.arch-node {
  background: rgba(255,255,255,.10); border: 1.5px solid rgba(255,255,255,.75);
  border-radius: 10px; padding: 12px 16px; color: #fff; text-align: center;
  min-width: 118px; display: flex; flex-direction: column; justify-content: center; gap: 3px;
  flex: 0 1 auto;
}
.arch-node .t { font-family: var(--font-mono); font-size: .78rem; font-weight: 600; letter-spacing: .04em; }
.arch-node .d { font-size: .68rem; opacity: .75; font-family: var(--font-mono); }
.arch-node.hot { border-color: #ffb59e; background: rgba(228,87,46,.28); }
.arch-arrow {
  align-self: center; color: rgba(255,255,255,.85);
  font-family: var(--font-mono); padding: 0 10px; font-size: 1rem;
  animation: pulse-arrow 2.2s ease-in-out infinite;
}
.arch-arrow:nth-child(4) { animation-delay: .3s; }
.arch-arrow:nth-child(6) { animation-delay: .6s; }
.arch-arrow:nth-child(8) { animation-delay: .9s; }
@keyframes pulse-arrow { 0%,100% { opacity: .45; } 50% { opacity: 1; } }
.arch-caption {
  text-align: center; margin-top: 16px; color: rgba(255,255,255,.7);
  font-family: var(--font-mono); font-size: .7rem; letter-spacing: .1em; text-transform: uppercase;
}
.arch-stack { display: grid; gap: 14px; min-width: 640px; }
.arch-row { display: flex; gap: 14px; justify-content: center; }

/* ---------- demo panel ---------- */
.demo {
  border: 1.5px solid var(--ink); border-radius: var(--radius);
  background: var(--card); box-shadow: var(--shadow-lift); overflow: hidden;
}
.demo-head {
  display: flex; align-items: center; gap: 10px;
  background: var(--ink); color: #f2f0ea; padding: 10px 16px;
}
.demo-head .dots { display: flex; gap: 5px; }
.demo-head .dots i { width: 9px; height: 9px; border-radius: 50%; background: #57617a; display: block; }
.demo-head .dots i:first-child { background: var(--accent); }
.demo-head .title { font-family: var(--font-mono); font-size: .74rem; letter-spacing: .1em; }
.demo-head .sim {
  margin-left: auto; font-family: var(--font-mono); font-size: .62rem;
  letter-spacing: .14em; text-transform: uppercase; color: #ffc9b5;
  border: 1px solid rgba(255,201,181,.5); padding: 2px 8px; border-radius: 999px;
}
.demo-body { padding: 22px; }
.demo label {
  display: block; font-family: var(--font-mono); font-size: .68rem;
  letter-spacing: .14em; text-transform: uppercase; color: var(--ink-soft);
  margin: 14px 0 6px;
}
.demo label:first-child { margin-top: 0; }
.demo input[type=text], .demo textarea, .demo select {
  width: 100%; font-family: var(--font-mono); font-size: .88rem;
  padding: 10px 12px; border: 1px solid var(--line-strong); border-radius: 8px;
  background: #fff; color: var(--ink); resize: vertical;
}
.demo input:focus, .demo textarea:focus, .demo select:focus {
  outline: 2px solid var(--accent); outline-offset: 1px; border-color: transparent;
}
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: var(--font-mono); font-weight: 600; font-size: .82rem;
  letter-spacing: .05em; cursor: pointer; border-radius: 9px;
  padding: 11px 20px; border: 1.5px solid var(--ink);
  background: var(--accent); color: #fff;
  box-shadow: 3px 3px 0 var(--ink);
  transition: transform .12s ease, box-shadow .12s ease, background .12s;
  margin-top: 18px;
}
.btn:hover { background: var(--accent-dark); transform: translate(-1px,-1px); box-shadow: 4px 4px 0 var(--ink); }
.btn:active { transform: translate(2px,2px); box-shadow: 1px 1px 0 var(--ink); }
.btn:disabled { opacity: .55; cursor: wait; transform: none; }
.btn.ghost { background: var(--card); color: var(--ink); }

.demo-out {
  margin-top: 20px; border-top: 1.5px dashed var(--line-strong); padding-top: 18px;
  display: none;
}
.demo-out.show { display: block; animation: rise .45s ease both; }
@keyframes rise { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: none; } }

.term {
  background: var(--code-bg); color: var(--code-ink); border-radius: 10px;
  font-family: var(--font-mono); font-size: .82rem; line-height: 1.65;
  padding: 16px 18px; white-space: pre-wrap; overflow-x: auto;
  max-height: 460px; overflow-y: auto;
}
.term .ok { color: #7ee2a8; } .term .warn { color: #ffd479; }
.term .err { color: #ff9d8a; } .term .dim { color: #93a0bd; }
.term .hl { color: #9fc4ff; }
.cursor { display: inline-block; width: 8px; height: 15px; background: var(--accent); vertical-align: -2px; animation: blink 1s steps(1) infinite; }
@keyframes blink { 50% { opacity: 0; } }

.spinner-line { font-family: var(--font-mono); font-size: .8rem; color: var(--ink-soft); display: flex; gap: 10px; align-items: center; }
.spinner-line::before {
  content: ""; width: 14px; height: 14px; border-radius: 50%;
  border: 2px solid var(--line-strong); border-top-color: var(--accent);
  animation: spin .7s linear infinite; display: inline-block;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* result stat tiles inside demos */
.stat-row { display: grid; grid-template-columns: repeat(auto-fit, minmax(120px, 1fr)); gap: 12px; margin-bottom: 16px; }
.stat {
  background: var(--paper-2); border: 1px solid var(--line-strong); border-radius: 10px;
  padding: 12px 14px; text-align: center;
}
.stat .v { font-family: var(--font-display); font-size: 1.5rem; font-weight: 640; color: var(--ink); }
.stat .v.good { color: var(--green); } .stat .v.bad { color: var(--accent-dark); } .stat .v.warn { color: var(--amber); }
.stat .k { font-family: var(--font-mono); font-size: .62rem; letter-spacing: .12em; text-transform: uppercase; color: var(--ink-soft); }

/* generic result table */
table.res { width: 100%; border-collapse: collapse; font-size: .88rem; background: #fff; border: 1px solid var(--line); border-radius: 10px; overflow: hidden; }
table.res th {
  font-family: var(--font-mono); font-size: .66rem; letter-spacing: .12em; text-transform: uppercase;
  text-align: left; color: var(--ink-soft); background: var(--paper-2);
  padding: 9px 12px; border-bottom: 1px solid var(--line-strong);
}
table.res td { padding: 9px 12px; border-bottom: 1px solid var(--line); vertical-align: top; }
table.res tr:last-child td { border-bottom: 0; }
.pill { font-family: var(--font-mono); font-size: .66rem; font-weight: 600; padding: 2px 9px; border-radius: 999px; letter-spacing: .05em; white-space: nowrap; }
.pill.red { background: #fbe3d9; color: var(--accent-dark); }
.pill.green { background: var(--green-soft); color: var(--green); }
.pill.amber { background: var(--amber-soft); color: var(--amber); }
.pill.blue { background: var(--blue-soft); color: var(--blue); }

/* ---------- footer ---------- */
footer.site {
  border-top: 1px solid var(--line); margin-top: 70px;
  padding: 34px 28px 46px; text-align: center;
  font-family: var(--font-mono); font-size: .74rem; color: var(--ink-soft);
}
footer.site .sig { font-family: var(--font-display); font-size: 1.05rem; color: var(--ink); margin-bottom: 6px; }
footer.site a { color: var(--blue); text-decoration: none; }
footer.site .pager { display: flex; justify-content: space-between; max-width: 1060px; margin: 0 auto 26px; gap: 12px; }
footer.site .pager a {
  font-family: var(--font-mono); font-size: .78rem; color: var(--ink);
  border: 1px solid var(--line-strong); background: var(--card);
  padding: 9px 16px; border-radius: 9px; text-decoration: none;
}
footer.site .pager a:hover { border-color: var(--accent); color: var(--accent-dark); }

/* ---------- reveal on scroll (only hidden when JS is running) ---------- */
.reveal { transition: opacity .6s ease, transform .6s ease; }
html.js .reveal { opacity: 0; transform: translateY(18px); }
html.js .reveal.in { opacity: 1; transform: none; }

/* ---------- index page ---------- */
.idx-hero { max-width: 1160px; margin: 0 auto; padding: 78px 28px 20px; position: relative; }
.idx-hero .overline {
  font-family: var(--font-mono); font-size: .72rem; letter-spacing: .3em;
  text-transform: uppercase; color: var(--accent-dark); margin-bottom: 18px;
}
.idx-hero h1 {
  font-family: var(--font-display); font-weight: 660;
  font-size: clamp(2.6rem, 6.4vw, 4.8rem); line-height: .99; letter-spacing: -.02em;
  max-width: 11em;
}
.idx-hero h1 em { font-style: italic; color: var(--accent); }
.idx-hero .lede { margin-top: 22px; font-size: 1.14rem; color: var(--ink-soft); max-width: 44em; }
.idx-stats { display: flex; gap: 34px; margin-top: 34px; flex-wrap: wrap; }
.idx-stats .s .v { font-family: var(--font-display); font-size: 2rem; font-weight: 660; }
.idx-stats .s .v span { color: var(--accent); }
.idx-stats .s .k { font-family: var(--font-mono); font-size: .64rem; letter-spacing: .16em; text-transform: uppercase; color: var(--ink-soft); }

.filters { max-width: 1160px; margin: 40px auto 0; padding: 0 28px; display: flex; gap: 8px; flex-wrap: wrap; }
.fbtn {
  font-family: var(--font-mono); font-size: .72rem; letter-spacing: .08em;
  padding: 7px 14px; border-radius: 999px; cursor: pointer;
  border: 1px solid var(--line-strong); background: var(--card); color: var(--ink-soft);
}
.fbtn:hover { border-color: var(--ink); color: var(--ink); }
.fbtn.on { background: var(--ink); color: var(--paper); border-color: var(--ink); }

.cards { max-width: 1160px; margin: 26px auto 0; padding: 0 28px; display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
@media (max-width: 1000px) { .cards { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 640px)  { .cards { grid-template-columns: 1fr; } }

.pcard {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  box-shadow: var(--shadow); padding: 20px 20px 18px;
  display: flex; flex-direction: column; gap: 10px;
  text-decoration: none; color: var(--ink); position: relative; overflow: hidden;
  transition: transform .18s ease, box-shadow .18s ease, border-color .18s;
}
.pcard:hover { transform: translateY(-4px); box-shadow: var(--shadow-lift); border-color: var(--line-strong); }
.pcard::after {
  content: "→"; position: absolute; right: 18px; bottom: 14px;
  font-family: var(--font-mono); color: var(--accent);
  opacity: 0; transform: translateX(-6px); transition: all .18s ease;
}
.pcard:hover::after { opacity: 1; transform: none; }
.pcard .rowtop { display: flex; justify-content: space-between; align-items: center; gap: 8px; }
.pcard .ch {
  font-family: var(--font-mono); font-size: .64rem; font-weight: 600;
  letter-spacing: .14em; text-transform: uppercase; color: var(--blue);
}
.pcard .track {
  font-family: var(--font-mono); font-size: .6rem; letter-spacing: .1em;
  text-transform: uppercase; color: var(--accent-dark);
  background: #fbe3d9; padding: 2px 8px; border-radius: 999px;
}
.pcard h3 { font-family: var(--font-display); font-weight: 640; font-size: 1.22rem; line-height: 1.15; }
.pcard p { font-size: .86rem; color: var(--ink-soft); flex: 1; }
.pcard .stack { display: flex; flex-wrap: wrap; gap: 0; }
.pcard .stack .chip { font-size: .62rem; padding: 2px 8px; margin: 0 5px 5px 0; }

/* ---------- track color system ---------- */
:root {
  --t-foundations: #b97d10; --t-foundations-soft: #f6ecd4;
  --t-agents: #c43f1a;      --t-agents-soft: #fbe3d9;
  --t-rag: #1f4e8c;         --t-rag-soft: #dfe8f4;
  --t-mcp: #6d4bb8;         --t-mcp-soft: #e9e1f8;
  --t-crew: #2e7d5b;        --t-crew-soft: #e0efe7;
  --t-evals: #b8405e;       --t-evals-soft: #f7dde4;
  --t-langchain: #0f766e;   --t-langchain-soft: #d9efec;
  --t-portfolio: #1b2437;   --t-portfolio-soft: #e3e5ea;
}

/* card header band */
.pcard { padding-top: 0; }
.phead {
  margin: 0 -20px 4px; padding: 14px 18px 10px;
  display: flex; align-items: center; justify-content: space-between;
  border-bottom: 1px solid var(--line);
  border-radius: var(--radius) var(--radius) 0 0;
  background: var(--paper-2);
}
.phead .pe { font-size: 1.9rem; line-height: 1; filter: saturate(1.05); }
.phead .pnum {
  font-family: var(--font-display); font-weight: 700; font-size: 2.1rem;
  line-height: 1; opacity: .22; letter-spacing: -.02em;
}
.pcard[data-track="foundations"] .phead { background: var(--t-foundations-soft); }
.pcard[data-track="agents"] .phead     { background: var(--t-agents-soft); }
.pcard[data-track="rag"] .phead        { background: var(--t-rag-soft); }
.pcard[data-track="mcp"] .phead        { background: var(--t-mcp-soft); }
.pcard[data-track="crew"] .phead       { background: var(--t-crew-soft); }
.pcard[data-track="evals"] .phead      { background: var(--t-evals-soft); }
.pcard[data-track="langchain"] .phead  { background: var(--t-langchain-soft); }
.pcard[data-track="portfolio"] .phead  { background: var(--t-portfolio-soft); }
.pcard[data-track="foundations"] .pnum, .pcard[data-track="foundations"] .ch { color: var(--t-foundations); }
.pcard[data-track="agents"] .pnum, .pcard[data-track="agents"] .ch           { color: var(--t-agents); }
.pcard[data-track="rag"] .pnum, .pcard[data-track="rag"] .ch                 { color: var(--t-rag); }
.pcard[data-track="mcp"] .pnum, .pcard[data-track="mcp"] .ch                 { color: var(--t-mcp); }
.pcard[data-track="crew"] .pnum, .pcard[data-track="crew"] .ch               { color: var(--t-crew); }
.pcard[data-track="evals"] .pnum, .pcard[data-track="evals"] .ch             { color: var(--t-evals); }
.pcard[data-track="langchain"] .pnum, .pcard[data-track="langchain"] .ch     { color: var(--t-langchain); }
.pcard[data-track="portfolio"] .pnum, .pcard[data-track="portfolio"] .ch     { color: var(--t-portfolio); }
.pcard .track { background: var(--paper-2); color: var(--ink-soft); }
.pcard[data-track="foundations"] .track { background: var(--t-foundations-soft); color: var(--t-foundations); }
.pcard[data-track="agents"] .track      { background: var(--t-agents-soft); color: var(--t-agents); }
.pcard[data-track="rag"] .track         { background: var(--t-rag-soft); color: var(--t-rag); }
.pcard[data-track="mcp"] .track         { background: var(--t-mcp-soft); color: var(--t-mcp); }
.pcard[data-track="crew"] .track        { background: var(--t-crew-soft); color: var(--t-crew); }
.pcard[data-track="evals"] .track       { background: var(--t-evals-soft); color: var(--t-evals); }
.pcard[data-track="langchain"] .track   { background: var(--t-langchain-soft); color: var(--t-langchain); }
.pcard[data-track="portfolio"] .track   { background: var(--t-portfolio-soft); color: var(--t-portfolio); }

/* capstone ribbon */
.pcard[data-cap]::before {
  content: "CAPSTONE"; position: absolute; top: 16px; right: -34px; z-index: 4;
  transform: rotate(45deg);
  font-family: var(--font-mono); font-size: .56rem; font-weight: 700; letter-spacing: .18em;
  background: var(--accent); color: #fff; padding: 3px 38px;
  box-shadow: 0 1px 3px rgba(27,36,55,.3);
}

/* filter track dots */
.fbtn[data-t]::before {
  content: ""; display: inline-block; width: 8px; height: 8px; border-radius: 50%;
  margin-right: 7px; vertical-align: 0;
}
.fbtn[data-t="foundations"]::before { background: var(--t-foundations); }
.fbtn[data-t="agents"]::before      { background: var(--t-agents); }
.fbtn[data-t="rag"]::before         { background: var(--t-rag); }
.fbtn[data-t="mcp"]::before         { background: var(--t-mcp); }
.fbtn[data-t="crew"]::before        { background: var(--t-crew); }
.fbtn[data-t="evals"]::before       { background: var(--t-evals); }
.fbtn[data-t="langchain"]::before   { background: var(--t-langchain); }
.fbtn[data-t="portfolio"]::before   { background: var(--t-portfolio); }

/* ---------- course journey rail ---------- */
.journey { max-width: 1160px; margin: 50px auto 0; padding: 0 28px; }
.journey h2 {
  font-family: var(--font-display); font-size: 1.7rem; font-weight: 640;
  display: flex; align-items: baseline; gap: 12px;
}
.journey h2 .idx { font-family: var(--font-mono); font-size: .8rem; font-weight: 600; color: var(--accent); letter-spacing: .08em; }
.journey .sub { color: var(--ink-soft); margin: 4px 0 6px; max-width: 52em; }
.rail-wrap { overflow-x: auto; padding: 8px 0 8px; display: flex; flex-direction: column; }
.rail { display: flex; min-width: max-content; position: relative; padding: 8px 6px 10px; justify-content: space-between; flex: 1; }
.rail::before {
  content: ""; position: absolute; left: 40px; right: 40px; top: 27px; height: 3px;
  background: var(--line-strong); border-radius: 2px;
}
.stop {
  width: 96px; flex: none; display: flex; flex-direction: column; align-items: center;
  gap: 7px; text-decoration: none; color: var(--ink); position: relative; padding: 0 4px;
}
.stop .dot {
  width: 38px; height: 38px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-mono); font-weight: 700; font-size: .72rem;
  background: var(--card); border: 2.5px solid var(--ink); color: var(--ink);
  position: relative; z-index: 1;
  transition: transform .15s ease, box-shadow .15s ease;
}
.stop .nm {
  font-size: .72rem; line-height: 1.25; text-align: center; color: var(--ink-soft);
  font-weight: 500;
}
.stop .pj { font-size: 1.05rem; line-height: 1; }
.stop:hover .dot { transform: scale(1.12); box-shadow: 0 4px 12px -4px rgba(27,36,55,.4); }
.stop:hover .nm { color: var(--ink); }
.stop[data-t="foundations"] .dot { border-color: var(--t-foundations); color: var(--t-foundations); background: var(--t-foundations-soft); }
.stop[data-t="agents"] .dot      { border-color: var(--t-agents); color: var(--t-agents); background: var(--t-agents-soft); }
.stop[data-t="rag"] .dot         { border-color: var(--t-rag); color: var(--t-rag); background: var(--t-rag-soft); }
.stop[data-t="mcp"] .dot         { border-color: var(--t-mcp); color: var(--t-mcp); background: var(--t-mcp-soft); }
.stop[data-t="crew"] .dot        { border-color: var(--t-crew); color: var(--t-crew); background: var(--t-crew-soft); }
.stop[data-t="evals"] .dot       { border-color: var(--t-evals); color: var(--t-evals); background: var(--t-evals-soft); }
.stop[data-t="langchain"] .dot   { border-color: var(--t-langchain); color: var(--t-langchain); background: var(--t-langchain-soft); }
.stop[data-t="portfolio"] .dot   { border-color: var(--t-portfolio); color: var(--t-portfolio); background: var(--t-portfolio-soft); }
.stop[data-cap] .dot { box-shadow: 0 0 0 3px var(--accent); }
.stop[data-cap]::after {
  content: "★ capstone"; font-family: var(--font-mono); font-size: .54rem; font-weight: 700;
  letter-spacing: .12em; text-transform: uppercase; color: var(--accent-dark);
}
.rail-legend {
  display: flex; gap: 14px; flex-wrap: wrap; margin-top: 6px;
  font-family: var(--font-mono); font-size: .64rem; letter-spacing: .06em; color: var(--ink-soft);
}
.rail-legend i { font-style: normal; display: inline-flex; align-items: center; gap: 5px; }
.rail-legend i::before { content: ""; width: 9px; height: 9px; border-radius: 50%; display: inline-block; }
.rail-legend i.l-foundations::before { background: var(--t-foundations); }
.rail-legend i.l-agents::before      { background: var(--t-agents); }
.rail-legend i.l-rag::before         { background: var(--t-rag); }
.rail-legend i.l-mcp::before         { background: var(--t-mcp); }
.rail-legend i.l-crew::before        { background: var(--t-crew); }
.rail-legend i.l-evals::before       { background: var(--t-evals); }
.rail-legend i.l-langchain::before   { background: var(--t-langchain); }
.rail-legend i.l-portfolio::before   { background: var(--t-portfolio); }