@import url("https://fonts.googleapis.com/css2?family=Alfa+Slab+One&family=Barlow:wght@500;600;700&family=Barlow+Condensed:wght@600;700&family=Shrikhand&display=swap");

/* A toy train set under a clear sky: slab-lettered boxcars in railroad livery, a track for every answer */
:root {
  --sky: #8fd3f4;
  --sky-band: #c9ecfb;
  --ink: #1d1a24;
  --ink-soft: #3d4a5c;
  --red: #e23b2e;
  --teal: #10928e;
  --yellow: #ffc533;
  --coupler: #ffffff;
  --rail: #4a3b33;
  --tie: #8a6b55;
  --good: #0f7a3d;
  --car-text: #ffffff;
  --car-ink: #1d1a24;
  --wheel: #1d1a24;
  --frame: #1d1a24;
  --sun: #ffd45e;
  --cloud: #ffffff;
  --stars: 0;
  --hill-far: #7cc98f;
  --hill-near: #4caf6e;
  --hub: #9aa3b2;
  --logo-shadow: #1d1a24;
  --display: "Alfa Slab One", "Rockwell", "Roboto Slab", Georgia, serif;
  --script: "Shrikhand", "Cooper Black", Georgia, serif;
  --board-face: "Barlow Condensed", "Arial Narrow", sans-serif;
  --ui: "Barlow", "Avenir Next", "Segoe UI", system-ui, sans-serif;
  --tile: 34px;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --sky: #12223d;
    --sky-band: #1b3154;
    --ink: #f3f0e8;
    --ink-soft: #a9b7cc;
    --red: #f0503f;
    --teal: #1fb0aa;
    --yellow: #ffcf4d;
    --coupler: #f3f0e8;
    --rail: #b39a86;
    --tie: #6d5646;
    --good: #5fd68f;
    --car-ink: #34303f;
    --wheel: #d5dae3;
    --frame: #8d99ae;
    --sun: #f3f0e8;
    --cloud: #2c4268;
    --stars: 0.9;
    --hill-far: #1f4547;
    --hill-near: #183638;
    --hub: #55627a;
    --logo-shadow: #050b17;
    color-scheme: dark;
  }
}

:root[data-theme="dark"] {
  --sky: #12223d;
  --sky-band: #1b3154;
  --ink: #f3f0e8;
  --ink-soft: #a9b7cc;
  --red: #f0503f;
  --teal: #1fb0aa;
  --yellow: #ffcf4d;
  --coupler: #f3f0e8;
  --rail: #b39a86;
  --tie: #6d5646;
  --good: #5fd68f;
  --car-ink: #34303f;
  --wheel: #d5dae3;
  --frame: #8d99ae;
  --sun: #f3f0e8;
  --cloud: #2c4268;
  --stars: 0.9;
  --hill-far: #1f4547;
  --hill-near: #183638;
  --hub: #55627a;
  --logo-shadow: #050b17;
  color-scheme: dark;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }

body {
  margin: 0;
  background: var(--sky);
  color: var(--ink);
  font: 500 17px/1.4 var(--ui);
  -webkit-tap-highlight-color: transparent;
}

#app {
  max-width: 460px;
  margin: 0 auto;
  padding-block: 14px 48px;
  padding-left: max(16px, env(safe-area-inset-left, 0px));
  padding-right: max(16px, env(safe-area-inset-right, 0px));
}

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

header { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.logo {
  margin: 0;
  display: flex;
  align-items: center;
  gap: 8px;
  font: 400 30px/1 var(--display);
  color: var(--red);
  letter-spacing: 0.01em;
  text-shadow: 2px 2px 0 var(--logo-shadow);
}
.logo-car { width: 64px; height: auto; flex: none; }
.logo a { display: flex; align-items: center; gap: 8px; color: inherit; text-decoration: none; }
.logo a:focus-visible { outline: 3px solid var(--ink); outline-offset: 4px; border-radius: 4px; }
.logo-car .body, .engine .body { fill: var(--red); }
.logo-car .plank { stroke: var(--logo-shadow); stroke-width: 0.6; opacity: 0.55; }
.logo-car .trim { fill: var(--logo-shadow); }
.logo-car .rivet { fill: var(--yellow); opacity: 0.8; }
.logo-car .window, .engine .window { fill: var(--yellow); }
.logo-car .frame, .logo-car .rail, .engine .frame { fill: var(--frame); }
.logo-car .rail-line { stroke: var(--wheel); stroke-width: 1.2; fill: none; }
.logo-car .wheel, .engine .wheel { fill: var(--wheel); }
.logo-car .hub, .engine .hub { fill: var(--hub); }
.logo-car .spoke { stroke: var(--hub); stroke-width: 0.9; }
.header-side { display: flex; align-items: center; gap: 8px; text-align: right; font-size: 14px; color: var(--ink-soft); }

h2 { font: 400 20px/1.2 var(--display); margin: 28px 0 8px; }

button {
  font: 700 17px/1 var(--ui);
  color: var(--ink);
  border: 0;
  border-radius: 6px;
  padding: 14px 18px;
  cursor: pointer;
  transition: transform 0.08s ease-out;
}
button:active:not(:disabled) { transform: translateY(2px); }
button:focus-visible { outline: 3px solid var(--ink); outline-offset: 2px; }
button:disabled { opacity: 0.35; cursor: default; }
button.primary { background: var(--red); color: #fff; box-shadow: 0 4px 0 color-mix(in srgb, var(--red) 60%, #000); }
button.secondary { background: transparent; box-shadow: inset 0 0 0 2px var(--ink); }
button.link { background: none; padding: 0; font: 600 14px/1.2 var(--ui); color: var(--ink); text-decoration: underline; text-underline-offset: 3px; }

.controls { display: flex; gap: 12px; margin: 10px 0 18px; }
.controls button { flex: 1; }

/* ---------- intro ---------- */

.lede { font: 600 22px/1.25 var(--ui); margin: 26px 0 14px; text-wrap: balance; }

/* The start screen is a railway poster: hills, sky and a train pulling in */
.poster { position: relative; height: 230px; margin: 4px -16px 0; overflow: hidden; }
.scenery { position: absolute; inset: 0; width: 100%; height: 100%; }
.scenery .sun { fill: var(--sun); }
.scenery .cloud { fill: var(--cloud); }
.scenery .stars { fill: var(--sun); opacity: var(--stars); }
.scenery .hill-far { fill: var(--hill-far); }
.scenery .hill-near { fill: var(--hill-near); }
.answer.demo {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  margin: 0;
  pointer-events: none;
  background: repeating-linear-gradient(90deg, var(--tie) 0 5px, transparent 5px 22px) bottom 0 left 0 / 100% 7px no-repeat;
}
.demo .car::before, .demo .car::after { box-shadow: 0 0 0 2px var(--hill-near); }
.train-engine { position: absolute; z-index: 30; }
.demo.rolling .car, .demo.rolling .train-engine { animation: pull-in 1.7s cubic-bezier(0.15, 0.6, 0.3, 1) both; }
.puff { position: absolute; width: 12px; height: 12px; border-radius: 50%; background: var(--cloud); opacity: 0; }
.demo.rolling .puff { animation: puff 1.4s ease-out both; }
@keyframes pull-in {
  from { transform: translateX(-110vw); }
  88% { transform: translateX(3px); }
}
@keyframes puff {
  0% { opacity: 0; transform: translate(0, 0) scale(0.4); }
  20% { opacity: 0.9; }
  100% { opacity: 0; transform: translate(-26px, -46px) scale(2.2); }
}

button.big { width: 100%; font: 400 24px/1 var(--display); padding: 16px; display: flex; flex-direction: column; gap: 6px; align-items: center; }
button.big span { font: 600 14px/1 var(--ui); opacity: 0.85; }
.howto-link { display: block; margin: 18px auto 0; }
.rules-link { display: block; width: fit-content; margin: 12px auto 0; font-size: 14px; color: var(--ink-soft); text-underline-offset: 3px; }
/* Hand-painted headline, like lettering on a fairground train */
.headline { font: 400 44px/1 var(--script); color: var(--red); margin: 24px 0 12px; letter-spacing: 0.005em; }
.scoring { font: 600 18px/1.35 var(--ui); margin: 0 0 24px; text-wrap: pretty; }

/* Start button as a train ticket: notched sides and a perforated stub */
.ticket {
  width: 100%;
  display: flex;
  align-items: stretch;
  padding: 0;
  border-radius: 4px;
  background: var(--red);
  color: #fff;
  box-shadow: inset 0 -5px 0 rgba(0, 0, 0, 0.2);
  -webkit-mask: radial-gradient(circle 11px at 0 50%, transparent 10px, #000 11px) left / 51% 100% no-repeat,
    radial-gradient(circle 11px at 100% 50%, transparent 10px, #000 11px) right / 51% 100% no-repeat;
  mask: radial-gradient(circle 11px at 0 50%, transparent 10px, #000 11px) left / 51% 100% no-repeat,
    radial-gradient(circle 11px at 100% 50%, transparent 10px, #000 11px) right / 51% 100% no-repeat;
}
.ticket-main { flex: 1; padding: 22px 0 24px 28px; text-align: left; font: 400 28px/1 var(--display); letter-spacing: 0.01em; }
.ticket-stub {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 4px;
  padding: 0 26px 4px 22px;
  font: 600 13px/1 var(--ui);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  background: radial-gradient(circle, var(--sky) 2.4px, transparent 3px) 0 2px / 6px 10px repeat-y;
}
.ticket-stub b { font: 400 20px/1 var(--display); letter-spacing: 0; text-transform: none; color: var(--yellow); }

/* ---------- tutorial ---------- */

.tutorial .hud, .tutorial #found { display: none; }
/* Once the practice trains are done, only the ticket is left to tap */
.coach .headline { display: block; margin: 8px 0 10px; }
.tutorial-done #coach-done { margin-top: 26px; }
.tutorial-done .controls:not(#coach-done), .tutorial-done .grid, .tutorial-done .preview, .tutorial-done #message, .tutorial-done #answer { display: none; }
.coach { font: 600 20px/1.3 var(--ui); margin: 22px 0 4px; min-height: 52px; text-wrap: balance; }
.coach b { color: var(--red); }
.coach-skip { display: block; margin: 18px auto 0; }
.hint { animation: beckon 1s ease-in-out infinite; }
.car.dragging { animation: none; }
.ghost-finger { position: absolute; z-index: 20; width: 34px; margin-left: -12px; pointer-events: none; opacity: 0; animation: ghost-drag 2.2s ease-in-out 0.6s infinite; }
.ghost-finger svg { display: block; width: 100%; fill: #fff; stroke: #1d1a24; stroke-width: 1.6; filter: drop-shadow(0 3px 3px rgba(0, 0, 0, 0.3)); }
@keyframes ghost-drag {
  0% { opacity: 0; transform: translate(0, 10px) scale(1.1); }
  15% { opacity: 0.9; transform: translate(0, 0) scale(1); }
  25% { transform: translate(0, 0) scale(0.92); }
  70% { opacity: 0.9; transform: translate(var(--slide), 0) scale(0.92); }
  85%, 100% { opacity: 0; transform: translate(var(--slide), -6px) scale(1); }
}
.answer.teach .tile.shared { animation: glint 1.2s ease-in-out infinite; }
@keyframes beckon {
  50% { transform: translateY(-5px); }
}
@keyframes glint {
  50% { filter: brightness(1.18); box-shadow: inset 0 0 0 3px var(--yellow); }
}

/* ---------- timer: an engine crossing the top of the screen ---------- */

.hud { margin: 14px 0 6px; }
.track {
  position: relative;
  height: 34px;
  border-bottom: 3px solid var(--rail);
  background: repeating-linear-gradient(90deg, var(--tie) 0 4px, transparent 4px 18px) bottom / 100% 6px no-repeat;
}
.engine { position: absolute; bottom: 1px; left: 0; width: 46px; transition: left 0.25s linear; }
.engine.low .body { fill: var(--yellow); }
.hud-row { display: flex; justify-content: space-between; align-items: baseline; margin-top: 8px; }
.time { font: 400 24px/1 var(--display); font-variant-numeric: tabular-nums; }
.tally { color: var(--ink-soft); font-variant-numeric: tabular-nums; }
.tally b { font: 400 22px/1 var(--display); color: var(--ink); }

/* ---------- answer area: cars on a siding ---------- */

.preview { text-align: center; min-height: 24px; margin-top: 14px; color: var(--red); font-weight: 700; }

.answer {
  position: relative;
  margin: 8px -16px 0;
  background:
    repeating-linear-gradient(90deg, var(--tie) 0 5px, transparent 5px 22px) bottom 0 left 0 / 100% 7px no-repeat,
    var(--sky-band);
  border-bottom: 3px solid var(--rail);
  overflow: hidden;
  touch-action: none;
}
.answer:empty::after {
  content: "Tap words below to start a train";
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--ink-soft);
  font-size: 15px;
}
.answer.depart .car { transform: translateX(130vw); transition: transform 0.45s cubic-bezier(0.5, 0, 0.9, 0.4); }

.car {
  position: absolute;
  top: 8px;
  display: flex;
  cursor: grab;
  user-select: none;
  border-radius: 5px 5px 3px 3px;
  box-shadow: inset 0 -4px 0 rgba(0, 0, 0, 0.22);
  transition: left 0.14s ease-out;
}
.car::before, .car::after {
  content: "";
  position: absolute;
  bottom: -6px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: radial-gradient(circle, var(--hub) 0 28%, var(--wheel) 32%);
  box-shadow: 0 0 0 2px var(--sky-band);
}
.car::before { left: 5px; }
.car::after { right: 5px; }
.car.arrive { animation: roll-in 0.22s ease-out; }
.car.dragging { transition: none; cursor: grabbing; z-index: 2; filter: drop-shadow(0 6px 6px rgba(0, 0, 0, 0.25)); }
.car .tile {
  width: var(--tile);
  height: var(--tile);
  display: flex;
  align-items: center;
  justify-content: center;
  font: 400 calc(var(--tile) * 0.56) var(--display);
  text-transform: uppercase;
  color: var(--car-text);
}
.car-0 { --car: var(--red); }
.car-1 { --car: var(--teal); }
.car-2 { --car: var(--yellow); }
.car-3 { --car: var(--car-ink); }
.car { background: var(--car); }
.car-2 .tile { color: #1d1a24; }
/* Shared letters are the coupling: same car, lighter paint */
/* Shared letters are the coupling: same car, lighter paint */
.car .tile.shared { background: color-mix(in srgb, var(--car) 40%, var(--coupler)); color: #1d1a24; box-shadow: inset 0 -4px 0 rgba(0, 0, 0, 0.12); }
.car .tile.shared:first-child { border-radius: 5px 0 0 3px; }
.car .tile.shared:last-child { border-radius: 0 5px 3px 0; }
.gap-bad { position: absolute; top: 4px; width: 4px; background: var(--red); border-radius: 2px; z-index: 9; }
.snap-tick { position: absolute; bottom: 2px; z-index: 9; width: 3px; height: 8px; background: var(--ink-soft); border-radius: 2px; }
.snap-tick.active { background: var(--red); height: 14px; width: 4px; }

.message { text-align: center; min-height: 26px; margin-top: 10px; font-weight: 700; color: var(--ink-soft); }
.message.good { color: var(--good); font: 400 20px/1.3 var(--display); }
.message.bad { color: var(--red); }

/* ---------- the yard: grid of cars to pick from ---------- */

.grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px 8px; padding-bottom: 6px; }
.grid button {
  position: relative;
  padding: 13px 2px 15px;
  font: 400 var(--size, 17px)/1 var(--display);
  letter-spacing: 0.02em;
  text-transform: uppercase;
  color: #fff;
  background: var(--car);
  white-space: nowrap;
  border-radius: 6px 6px 3px 3px;
  box-shadow: inset 0 -5px 0 rgba(0, 0, 0, 0.22);
  transition: transform 0.12s ease-out, opacity 0.12s;
}
.grid button::before, .grid button::after {
  content: "";
  position: absolute;
  bottom: -6px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: radial-gradient(circle, var(--hub) 0 28%, var(--wheel) 32%);
  box-shadow: 0 0 0 2px var(--sky);
}
.grid button::before { left: 12%; }
.grid button::after { right: 12%; }
.grid button.car-2 { color: #1d1a24; }
.grid button.used { opacity: 0.28; transform: translateY(3px); }

/* ---------- manifest: found words, missed words ---------- */

.manifest { list-style: none; padding: 0; margin: 18px 0 0; display: grid; grid-template-columns: 1fr 1fr; gap: 6px 20px; }
.manifest li { display: flex; justify-content: space-between; align-items: baseline; gap: 8px; min-width: 0; font: 700 16px/1.3 var(--ui); letter-spacing: 0.04em; text-transform: uppercase; }
.manifest li b { font: 400 16px/1 var(--display); color: var(--red); letter-spacing: 0; }
.manifest.missed { grid-template-columns: 1fr; }
.manifest li.long { grid-column: 1 / -1; }
.manifest.missed li { flex-wrap: wrap; color: var(--ink-soft); }
.manifest small { flex-basis: 100%; font: 500 13px/1.2 var(--ui); text-transform: lowercase; letter-spacing: 0; color: var(--ink-soft); }

/* ---------- results ---------- */

.final { display: flex; align-items: baseline; justify-content: center; gap: 10px; margin-top: 30px; }
.final b { font: 400 76px/1 var(--display); color: var(--red); }
.final span { font: 400 24px/1 var(--display); }
.sub { text-align: center; color: var(--ink-soft); margin: 8px 0 0; }
.replay-note { width: fit-content; margin: 10px auto 0; padding: 3px 10px; border-radius: 4px; background: var(--sky-band); font-weight: 700; font-size: 15px; }
.share-row { margin: 20px 0 0; }
#final-found { margin-top: 4px; }
.share-row button { font: 400 22px/1 var(--display); padding: 16px; }
#share-text { width: 100%; font: 500 15px/1.4 var(--ui); background: var(--sky-band); color: var(--ink); border: 0; border-radius: 6px; padding: 10px; }

/* ---------- past days ---------- */

.archive { list-style: none; padding: 0; margin: 0; }
.archive li + li { border-top: 2px solid var(--sky-band); }
.archive button { width: 100%; display: flex; justify-content: space-between; background: none; padding: 14px 2px; text-align: left; border-radius: 0; }
.archive button span:last-child { color: var(--ink-soft); font-weight: 600; font-variant-numeric: tabular-nums; }

/* ---------- internal test panel ---------- */

.test { margin: 48px 0 12px; padding: 10px 0; border-top: 3px solid var(--red); border-bottom: 3px solid var(--red); display: grid; gap: 8px; font-size: 14px; }
.test::before { content: "Internal test build"; color: var(--red); font-weight: 700; }
.test-nav { display: flex; gap: 8px; }
.test-nav button { padding: 6px 14px; box-shadow: inset 0 0 0 2px var(--ink); background: transparent; }
.test-nav select { flex: 1; min-width: 0; font: inherit; padding: 6px; border-radius: 6px; border: 2px solid var(--ink); background: var(--sky-band); color: var(--ink); }
.test-stats { color: var(--ink-soft); font-variant-numeric: tabular-nums; }
.test-toggle { display: flex; gap: 6px; align-items: center; }
.test .manifest { margin: 0; }

/* ---------- motion ---------- */

@keyframes roll-in {
  from { transform: translateX(-40px); opacity: 0; }
}
.jolt { animation: jolt 0.32s; }
@keyframes jolt {
  20% { transform: translateX(-8px); }
  45% { transform: translateX(7px); }
  70% { transform: translateX(-4px); }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
}

/* ---------- analytics opt-out note ---------- */

.gc-note {
  position: fixed;
  left: 50%;
  top: max(16px, env(safe-area-inset-top, 0px));
  transform: translateX(-50%);
  z-index: 50;
  padding: 10px 16px;
  border-radius: 6px;
  background: var(--yellow);
  color: #1d1a24;
  font: 700 14px/1.2 var(--ui);
  white-space: nowrap;
  pointer-events: none;
}

/* ---------- 404 page ---------- */

.lost { padding-top: 18vh; }
.lost .headline { margin-top: 0; }
a.ticket { text-decoration: none; }

/* ---------- menu: a station departure board ---------- */

.menu-button { background: none; padding: 6px; color: var(--ink); }
.menu-button svg { display: block; width: 28px; height: 28px; stroke: currentColor; stroke-width: 2.6; stroke-linecap: round; }

.board {
  margin: 22px -16px 18px;
  padding: 18px 16px 10px;
  background: #1d1a24;
  color: #ffc533;
  font-family: var(--board-face);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.board-title { margin: 0 0 8px; font: 700 15px/1 var(--board-face); color: #f3f0e8; opacity: 0.7; letter-spacing: 0.18em; }
.board-row {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  padding: 14px 0;
  background: none;
  color: inherit;
  border-radius: 0;
  border-top: 1px solid rgba(255, 197, 51, 0.25);
  font: 700 26px/1 var(--board-face);
  letter-spacing: inherit;
  text-transform: inherit;
  text-align: left;
}
.board-row span:last-child { font-size: 17px; color: #f3f0e8; opacity: 0.75; }
.board-row:focus-visible { outline: 3px solid #ffc533; outline-offset: -3px; }

.stats-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 18px 16px; margin: 8px 0 18px; }
.stats-grid div { min-width: 0; }
.stats-grid dt { font: 700 14px/1.2 var(--board-face); text-transform: uppercase; letter-spacing: 0.08em; color: var(--ink-soft); }
.stats-grid dd { margin: 2px 0 0; font: 400 36px/1 var(--display); color: var(--red); font-variant-numeric: tabular-nums; }

.about-text { font-size: 18px; margin: 0 0 14px; text-wrap: pretty; }
.about-text a, .fine a { color: var(--ink); text-underline-offset: 3px; }
.fine { font-size: 15px; color: var(--ink-soft); margin: 0 0 16px; }

.next-train { text-align: center; margin: 14px 0 0; font: 700 18px/1 var(--board-face); text-transform: uppercase; letter-spacing: 0.08em; }