/* Detour — a road-atlas essay. No external fonts or libraries. */
:root {
  --paper: #f3ede0;
  --paper-2: #e9e0cb;
  --sheet: #fbf8f1;
  --ink: #1c2622;
  --ink-2: #44514b;
  --green: #1f4a3a;
  --green-2: #2f6a53;
  --terra: #a6462a;
  --terra-soft: #e9c7b6;
  --blue: #cfe1ea;
  --blue-ink: #2b5b73;
  --line: #c9bea5;
  --focus: #1f4a3a;
  --shadow: 0 1px 0 rgba(60, 45, 20, .08), 0 10px 28px -18px rgba(60, 45, 20, .45);
  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, "Book Antiqua", Georgia, "Times New Roman", serif;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --measure: 40rem;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --paper: #13201b;
    --paper-2: #1a2a23;
    --sheet: #1b2722;
    --ink: #ece6d8;
    --ink-2: #bdc6bf;
    --green: #8fd0b2;
    --green-2: #a9dcc4;
    --terra: #f0a184;
    --terra-soft: #4a2c22;
    --blue: #20384a;
    --blue-ink: #a9cfe2;
    --line: #3b4b43;
    --focus: #f0c27a;
    --shadow: 0 1px 0 rgba(0, 0, 0, .3), 0 12px 30px -18px rgba(0, 0, 0, .8);
    color-scheme: dark;
  }
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: 5rem; }
body {
  margin: 0;
  background-color: var(--paper);
  background-image:
    radial-gradient(circle at 1px 1px, rgba(120, 100, 60, .14) 1px, transparent 0);
  background-size: 22px 22px;
  color: var(--ink);
  font: 1.0625rem/1.65 var(--serif);
  overflow-x: hidden;
}
img, svg { max-width: 100%; }
a { color: var(--green); text-underline-offset: .18em; text-decoration-thickness: 1px; }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 3px solid var(--focus); outline-offset: 3px; border-radius: 3px; }
.sr-only { position: absolute; width: 1px; height: 1px; margin: -1px; padding: 0; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0; }

.skip {
  position: absolute; left: 1rem; top: -4rem; z-index: 50;
  background: var(--green); color: var(--sheet); padding: .6rem 1rem; border-radius: 6px; font-family: var(--sans);
}
.skip:focus { top: .75rem; }

/* ---------- Top bar + progress rail ---------- */
.topbar {
  position: sticky; top: 0; z-index: 20;
  background: color-mix(in srgb, var(--paper) 92%, transparent);
  backdrop-filter: saturate(1.2);
  border-bottom: 1px solid var(--line);
}
@supports not (background: color-mix(in srgb, red, blue)) { .topbar { background: var(--paper); } }
.topbar__inner {
  max-width: 72rem; margin: 0 auto; padding: .55rem 1rem;
  display: flex; align-items: center; justify-content: space-between; gap: .75rem;
  font-family: var(--sans);
}
.mark { display: inline-flex; align-items: center; gap: .45rem; color: var(--green); text-decoration: none; font-weight: 700; letter-spacing: .02em; }
.mark__icon { width: 1.5rem; height: 1.5rem; color: var(--terra); flex: none; }
.home-link {
  display: inline-block; font-size: .85rem; font-weight: 600; color: var(--sheet); background: var(--green);
  padding: .45rem .8rem; border-radius: 999px; text-decoration: none; line-height: 1.25; text-align: center;
}
.home-link:hover { background: var(--green-2); color: var(--sheet); }
@media (prefers-color-scheme: dark) { .home-link, .home-link:hover { color: #10201a; } }

.rail { position: relative; height: 4px; background: var(--paper-2); }
.rail__fill { position: absolute; inset: 0 auto 0 0; width: 0; background: var(--terra); }
.rail__tram {
  position: absolute; top: 50%; left: 0; width: 12px; height: 12px; margin: -6px 0 0 -6px;
  border-radius: 50%; background: var(--sheet); border: 3px solid var(--terra);
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: .4rem;
  min-height: 44px; padding: .55rem 1.05rem; border-radius: 999px;
  border: 1.5px solid var(--green); background: transparent; color: var(--green);
  font: 600 .95rem/1.2 var(--sans); text-decoration: none; cursor: pointer;
  transition: background-color .2s, color .2s, transform .2s;
}
.btn:hover { background: var(--blue); }
.btn:active { transform: translateY(1px); }
.btn--solid { background: var(--green); color: var(--sheet); }
.btn--solid:hover { background: var(--green-2); color: var(--sheet); }
@media (prefers-color-scheme: dark) { .btn--solid, .btn--solid:hover { color: #10201a; } }
.btn--small { min-height: 40px; padding: .4rem .8rem; font-size: .85rem; }
.btn--big { font-size: 1.05rem; padding: .8rem 1.4rem; }
.btn[disabled] { opacity: .45; cursor: not-allowed; }

/* ---------- Sheets (unfolded paper) ---------- */
.sheet {
  position: relative;
  background:
    linear-gradient(90deg, transparent calc(50% - 1px), rgba(120, 100, 60, .07) 50%, transparent calc(50% + 1px)),
    var(--sheet);
  border: 1px solid var(--line);
  border-radius: 4px;
  box-shadow: var(--shadow);
  padding: 1.5rem 1.15rem;
}
@media (min-width: 600px) { .sheet { padding: 2.2rem 2.4rem; } }

.kicker { font: 600 .78rem/1.3 var(--sans); letter-spacing: .12em; text-transform: uppercase; color: var(--ink-2); margin: 0 0 1rem; display: flex; flex-wrap: wrap; align-items: center; gap: .6rem; }
.sign {
  display: inline-block; background: var(--terra); color: var(--sheet); padding: .2rem .55rem .2rem .45rem;
  clip-path: polygon(0 0, 88% 0, 100% 50%, 88% 100%, 0 100%); padding-right: 1rem; letter-spacing: .1em;
}
@media (prefers-color-scheme: dark) { .sign { color: #1a0f0a; } }

/* ---------- Hero ---------- */
main { overflow-x: clip; }
.hero {
  max-width: 72rem; margin: 0 auto; padding: 1.5rem 1rem 2rem;
  display: grid; gap: 1.5rem; align-items: center;
}
@media (min-width: 960px) { .hero { grid-template-columns: 1.1fr .9fr; padding: 3.5rem 1rem 3rem; gap: 2.5rem; } }
.sheet--hero { transform-origin: left center; }
h1 {
  font-weight: 600; font-size: clamp(2.1rem, 7vw, 3.9rem); line-height: 1.04; letter-spacing: -.015em;
  margin: 0 0 1rem; color: var(--green); text-wrap: balance;
}
h1 em { font-style: italic; color: var(--terra); }
.dek { font-size: 1.15rem; color: var(--ink-2); margin: 0 0 1.25rem; max-width: 36rem; }
.thesis { border-left: 4px solid var(--terra); padding: .15rem 0 .15rem 1rem; margin: 0 0 1.5rem; max-width: 36rem; }
.hero__actions { display: flex; flex-wrap: wrap; gap: .65rem; margin-bottom: 1.25rem; }
.byline { font: .85rem/1.4 var(--sans); color: var(--ink-2); margin: 0; }

.hero__map { margin: 0; background: var(--blue); border: 1px solid var(--line); border-radius: 4px; box-shadow: var(--shadow); overflow: hidden; }
.hero__map svg { display: block; width: 100%; height: auto; }
.m-grid { stroke: rgba(43, 91, 115, .18); stroke-width: 1; }
.m-fold { stroke: rgba(28, 38, 34, .14); stroke-width: 2; fill: none; }
.m-water { fill: rgba(43, 91, 115, .16); }
.m-road { fill: none; stroke-linecap: round; stroke-linejoin: round; }
.m-road--ghost { stroke: var(--ink-2); stroke-width: 2; stroke-dasharray: 2 9; opacity: .55; }
.m-route { stroke: var(--terra); stroke-width: 7; }
.m-stops circle { fill: var(--sheet); stroke: var(--green); stroke-width: 4; }
.m-post path { stroke: var(--green); stroke-width: 4; fill: none; stroke-linecap: round; }
.m-post .m-post__a { fill: var(--green); stroke: none; }
.m-post .m-post__b { fill: var(--sheet); stroke-width: 3; }
.m-label { font: italic 600 17px var(--serif); fill: var(--green); }

/* Unfold + route draw on load (motion only if allowed) */
@media (prefers-reduced-motion: no-preference) {
  .sheet--hero { animation: unfold .9s cubic-bezier(.2, .7, .2, 1) both; }
  .m-route { stroke-dasharray: 1400; stroke-dashoffset: 1400; animation: draw 2.4s .4s ease-out forwards; }
  .m-post { transition: transform .5s; transform-box: fill-box; }
  .hero__map:hover .m-post__a { transform: translateX(3px); transition: transform .3s; }
}
@keyframes unfold { from { transform: perspective(900px) rotateY(-14deg); opacity: 0; } to { transform: none; opacity: 1; } }
@keyframes draw { to { stroke-dashoffset: 0; } }

/* ---------- Layout with stations ---------- */
.layout { max-width: 72rem; margin: 0 auto; padding: 0 1rem; display: grid; gap: 1.5rem; }
@media (min-width: 1024px) { .layout { grid-template-columns: 14rem minmax(0, 1fr); gap: 3rem; } }

.stations { font-family: var(--sans); font-size: .9rem; }
.stations__title { font-weight: 700; letter-spacing: .12em; text-transform: uppercase; font-size: .72rem; color: var(--ink-2); margin: 0 0 .6rem; }
.stations ol { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: .4rem; }
.stations li a {
  display: inline-block; padding: .35rem .7rem; border: 1px solid var(--line); border-radius: 999px;
  background: var(--sheet); color: var(--ink); text-decoration: none; min-height: 32px;
}
.stations li a[aria-current="true"] { border-color: var(--terra); color: var(--terra); font-weight: 600; }
.legend { margin-top: 1.1rem; display: none; }
.legend p { margin: 0 0 .45rem; color: var(--ink-2); font-size: .82rem; line-height: 1.35; }

@media (min-width: 1024px) {
  .stations { position: sticky; top: 5.5rem; align-self: start; padding-top: .5rem; }
  .stations ol { display: block; position: relative; padding-left: 1.4rem; }
  .stations ol::before { content: ""; position: absolute; left: .42rem; top: .7rem; bottom: .7rem; width: 4px; background: var(--green); border-radius: 2px; }
  .stations li { position: relative; margin: 0 0 .15rem; }
  .stations li::before {
    content: ""; position: absolute; left: -1.25rem; top: .62rem; width: 12px; height: 12px; border-radius: 50%;
    background: var(--sheet); border: 3px solid var(--green);
  }
  .stations li:has(a[aria-current="true"])::before { border-color: var(--terra); background: var(--terra); }
  .stations li a { border: 0; background: none; padding: .3rem .4rem; }
  .legend { display: block; }
}

/* ---------- Essay ---------- */
.essay { display: grid; gap: 1.25rem; min-width: 0; }
.essay > .sheet { max-width: calc(var(--measure) + 5rem); }
.essay h2 {
  font-weight: 600; font-size: clamp(1.45rem, 4.4vw, 2rem); line-height: 1.15; color: var(--green);
  margin: 0 0 1rem; display: flex; gap: .7rem; align-items: baseline; text-wrap: balance;
}
.num {
  flex: none; display: inline-grid; place-items: center; width: 2rem; height: 2rem; border-radius: 50%;
  background: var(--terra); color: var(--sheet); font: 700 .95rem/1 var(--sans); transform: translateY(-.15em);
}
@media (prefers-color-scheme: dark) { .num { color: #1a0f0a; } }
.essay p { margin: 0 0 1rem; max-width: var(--measure); }
.essay p:last-child { margin-bottom: 0; }
.lede::first-letter { float: left; font-size: 3.4em; line-height: .85; padding: .08em .1em 0 0; color: var(--terra); font-weight: 600; }

.note {
  font: .9rem/1.5 var(--sans); color: var(--ink-2); background: var(--paper);
  border: 1px dashed var(--line); border-radius: 6px; padding: .6rem .8rem;
}
.tag {
  display: inline-block; font: 700 .68rem/1 var(--sans); letter-spacing: .08em; text-transform: uppercase;
  padding: .3rem .45rem; border-radius: 3px; margin-right: .35rem; vertical-align: .1em;
}
.tag--fact { background: var(--green); color: var(--sheet); }
.tag--view { background: var(--blue); color: var(--blue-ink); border: 1px solid var(--blue-ink); }
.tag--open { background: transparent; color: var(--terra); border: 1.5px dashed var(--terra); }
.tag--fic { background: var(--terra-soft); color: var(--ink); }
@media (prefers-color-scheme: dark) { .tag--fact { color: #10201a; } }

.signs { margin: 0 0 1rem; padding: 0; list-style: none; max-width: var(--measure); }
.signs li { position: relative; padding: .5rem 0 .5rem 2rem; border-bottom: 1px dotted var(--line); }
.signs li::before { content: ""; position: absolute; left: .2rem; top: .9rem; width: 1.1rem; height: .7rem; background: var(--terra); clip-path: polygon(0 0, 70% 0, 100% 50%, 70% 100%, 0 100%); }

.compare { margin: 1.25rem 0; display: grid; gap: .75rem; max-width: var(--measure); }
@media (min-width: 640px) { .compare { grid-template-columns: 1fr 1.5fr; } }
.compare__col { border: 1px solid var(--line); border-radius: 6px; padding: .9rem 1rem; background: var(--paper); }
.compare__col p { margin: 0; }
.compare__col--true { border: 2px solid var(--green); background: var(--sheet); }
.essay .compare__label { font: 700 .72rem/1.2 var(--sans); letter-spacing: .1em; text-transform: uppercase; color: var(--ink-2); margin-bottom: .45rem; }
.compare__col--true .compare__label { color: var(--green); }

.sheet--arrival { border-top: 6px solid var(--terra); }
.three { list-style: none; counter-reset: t; padding: 0; margin: 0 0 1.2rem; max-width: var(--measure); display: grid; gap: .6rem; }
.three li { counter-increment: t; display: grid; grid-template-columns: 2.2rem 1fr; column-gap: .6rem; }
.three li::before { content: counter(t); grid-row: span 2; width: 2rem; height: 2rem; border-radius: 50%; border: 2px solid var(--green); display: grid; place-items: center; font: 700 .9rem var(--sans); color: var(--green); }
.three__k { font-weight: 700; color: var(--green); display: block; }
.principle { background: var(--green); color: var(--sheet); border-radius: 6px; padding: 1.2rem 1.3rem; margin: 1.5rem 0; max-width: var(--measure); }
@media (prefers-color-scheme: dark) { .principle { color: #10201a; } }
.essay .principle p { margin: 0; color: inherit; }
.essay .principle__k { font: 700 .72rem/1.2 var(--sans); letter-spacing: .12em; text-transform: uppercase; opacity: .85; margin-bottom: .5rem; }
.essay .principle__p { font-size: 1.25rem; line-height: 1.45; font-style: italic; }

/* ---------- Crossroads Atlas ---------- */
.atlas { max-width: 60rem; margin: 3.5rem auto 0; padding: 0 1rem; }
.atlas__head h2 { font-size: clamp(1.7rem, 5vw, 2.5rem); color: var(--green); margin: 0 0 .6rem; line-height: 1.1; }
.atlas__head p { max-width: var(--measure); color: var(--ink-2); }
.atlas__app { background: var(--blue); border: 1px solid var(--line); border-radius: 6px; box-shadow: var(--shadow); padding: 1rem; margin-top: 1rem; }
@media (min-width: 640px) { .atlas__app { padding: 1.4rem; } }
.atlas__bar { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: .6rem; margin-bottom: .6rem; }
.atlas__step { margin: 0; font: 700 .8rem/1.2 var(--sans); letter-spacing: .1em; text-transform: uppercase; color: var(--blue-ink); }
.atlas__tools { display: flex; flex-wrap: wrap; gap: .4rem; }
.atlas__tools .btn { background: var(--sheet); }
.atlas__tools .btn:hover { background: var(--paper); }
.atlas__map { display: block; width: 100%; height: auto; margin: .2rem 0 .8rem; }
.am-lane { stroke: rgba(43, 91, 115, .28); stroke-width: 2; stroke-dasharray: 3 6; fill: none; }
.am-trunk { stroke: var(--green); stroke-width: 5; fill: none; stroke-linecap: round; stroke-linejoin: round; }
.am-path { stroke: var(--terra); stroke-width: 6; fill: none; stroke-linecap: round; stroke-linejoin: round; }
@media (prefers-reduced-motion: no-preference) { .am-path { transition: d .5s; } .am-new { animation: draw .7s ease-out forwards; } }
.am-node { fill: var(--sheet); stroke: var(--green); stroke-width: 3; }
.am-node--on { fill: var(--terra); stroke: var(--terra); }
.am-node--here { fill: var(--sheet); stroke: var(--terra); stroke-width: 4; }
.am-end { fill: var(--green); }
.am-txt { font: 700 12px var(--sans); fill: var(--blue-ink); }

.atlas__card { background: var(--sheet); border: 1px solid var(--line); border-radius: 4px; padding: 1.15rem; }
.atlas__card:focus { outline: none; }
.atlas__card:focus-visible { outline: 3px solid var(--focus); }
@media (min-width: 640px) { .atlas__card { padding: 1.6rem 1.8rem; } }
.atlas__q { margin: 0 0 .4rem; font-size: 1.35rem; color: var(--green); line-height: 1.2; }
.atlas__ctx { margin: 0 0 1rem; color: var(--ink-2); }
.atlas__choices { display: grid; gap: .55rem; }
.choice {
  display: block; width: 100%; text-align: left; cursor: pointer;
  background: var(--paper); color: var(--ink); border: 1.5px solid var(--line); border-radius: 6px;
  padding: .8rem 1rem .8rem 2.6rem; font: 600 1rem/1.35 var(--serif); position: relative; min-height: 48px;
  transition: border-color .2s, background-color .2s;
}
.choice::before {
  content: ""; position: absolute; left: .9rem; top: 1.05rem; width: 1.05rem; height: .7rem; background: var(--green);
  clip-path: polygon(0 0, 70% 0, 100% 50%, 70% 100%, 0 100%); transition: transform .2s;
}
.choice:hover { border-color: var(--green); background: var(--sheet); }
.choice:hover::before { transform: translateX(3px); }
.atlas__result { margin-top: .2rem; }
.atlas__result:empty { display: none; }
.res-carry { display: inline-block; margin: 0 0 .5rem; font: 700 .72rem/1 var(--sans); letter-spacing: .08em; text-transform: uppercase; color: var(--sheet); background: var(--terra); padding: .35rem .5rem; border-radius: 3px; }
@media (prefers-color-scheme: dark) { .res-carry { color: #1a0f0a; } }
.res-choice { font-weight: 700; margin: 0 0 .35rem; }
.res-text { margin: 0 0 1rem; }
.res-list { margin: .5rem 0 1rem; padding-left: 1.2rem; }
.res-list li { margin-bottom: .4rem; }
.res-end { border-top: 1px solid var(--line); padding-top: 1rem; margin-top: 1rem; }
.res-actions { display: flex; flex-wrap: wrap; gap: .5rem; }

.routes { margin-top: 1.25rem; background: var(--sheet); border: 1px solid var(--line); border-radius: 6px; padding: 1.2rem; }
@media (min-width: 640px) { .routes { padding: 1.6rem 1.8rem; } }
.routes[hidden] { display: none; }
.routes__title { margin: 0 0 .3rem; color: var(--green); font-size: 1.3rem; }
.routes__intro { margin: 0 0 1rem; color: var(--ink-2); }
.routes__list { margin: 0; padding: 0; list-style: none; display: grid; gap: 1.2rem; }
.fork h4 { margin: 0 0 .3rem; font: 700 .85rem/1.3 var(--sans); letter-spacing: .06em; text-transform: uppercase; color: var(--terra); }
.fork__ctx { margin: 0 0 .5rem; color: var(--ink-2); font-style: italic; }
.fork ul { margin: 0; padding-left: 1.2rem; }
.fork li { margin-bottom: .45rem; }
.convergence { margin-top: 1.3rem; padding-top: 1rem; border-top: 2px dashed var(--line); }
.convergence h4 { margin: 0 0 .3rem; color: var(--green); font-size: 1.1rem; }
.convergence p { margin: 0; }

/* ---------- Return + footer ---------- */
.return {
  max-width: 60rem; margin: 3.5rem auto 0; padding: 1.5rem 1rem;
  display: flex; flex-wrap: wrap; align-items: center; gap: 1.25rem;
}
.return h2 { margin: 0 0 .4rem; color: var(--green); font-size: 1.5rem; line-height: 1.2; }
.return p { margin: 0 0 1rem; color: var(--ink-2); max-width: 32rem; }
.return__post { width: 6rem; height: 6rem; flex: none; }
.p-pole { stroke: var(--green); stroke-width: 5; stroke-linecap: round; fill: none; }
.p-a { fill: var(--terra); }
.p-b { fill: var(--green); }
@media (prefers-reduced-motion: no-preference) {
  .return:hover .p-a, .return:focus-within .p-a { transform: translateX(4px); }
  .p-a { transition: transform .35s; }
}

.foot {
  margin-top: 3rem; border-top: 1px solid var(--line); background: var(--paper-2);
  padding: 1.5rem 1rem 2rem; text-align: center; font: .92rem/1.5 var(--sans); color: var(--ink-2);
}
.foot p { margin: 0 auto .4rem; max-width: 40rem; }
.foot__small { font-size: .8rem; }

/* 404 */
.lost { max-width: 40rem; margin: 3rem auto; padding: 0 1rem; }
.lost h1 { font-size: clamp(2rem, 7vw, 3rem); }
.lost .hero__actions { margin-top: 1.5rem; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
}
@media print {
  .topbar, .stations, .atlas__app, .return__post, .hero__map, .skip { display: none !important; }
  .routes[hidden] { display: block !important; }
  body { background: #fff; }
  .sheet { box-shadow: none; }
}