:root {
  --ink: #10162f;
  --paper: #f4f1e8;
  --white: #fffefa;
  --cyan: #25d9d0;
  --lime: #c9f268;
  --orange: #ff9f5a;
  --violet: #9585ff;
  --pink: #ff82ac;
  --line: rgba(16, 22, 47, 0.18);
  --radius: 24px;
  --shadow: 0 18px 60px rgba(16, 22, 47, 0.12);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: "Avenir Next", Avenir, "Segoe UI", Arial, sans-serif;
  line-height: 1.55;
}
button, input { font: inherit; }
a { color: inherit; }
.skip-link {
  position: fixed;
  left: 1rem;
  top: -4rem;
  z-index: 100;
  padding: .75rem 1rem;
  border-radius: 8px;
  background: var(--lime);
  font-weight: 800;
}
.skip-link:focus { top: 1rem; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 72px;
  padding: .8rem clamp(1.1rem, 4vw, 4rem);
  color: var(--white);
  background: rgba(16, 22, 47, .94);
  border-bottom: 1px solid rgba(255, 255, 255, .12);
  backdrop-filter: blur(12px);
}
.brand {
  display: flex;
  gap: .75rem;
  align-items: center;
  text-decoration: none;
  font-weight: 800;
}
.brand-mark {
  display: grid;
  place-items: center;
  width: 38px;
  aspect-ratio: 1;
  border-radius: 50%;
  color: var(--ink);
  background: var(--cyan);
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
}
nav { display: flex; gap: .35rem; }
nav a {
  display: grid;
  place-items: center;
  width: 36px;
  aspect-ratio: 1;
  border-radius: 50%;
  color: rgba(255, 255, 255, .7);
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  font-size: .8rem;
  text-decoration: none;
}
nav a:hover, nav a:focus-visible { color: var(--ink); background: var(--lime); outline: none; }

.hero {
  position: relative;
  min-height: 690px;
  overflow: hidden;
  padding: clamp(5rem, 11vw, 9rem) clamp(1.1rem, 6vw, 7rem);
  color: var(--white);
  background:
    linear-gradient(rgba(255,255,255,.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.04) 1px, transparent 1px),
    var(--ink);
  background-size: 44px 44px;
}
.hero::after {
  content: "";
  position: absolute;
  inset: auto -10% -180px 35%;
  height: 440px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(37,217,208,.18), transparent 66%);
}
.eyebrow, .kicker, .mission-label {
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  font-size: .74rem;
  font-weight: 500;
  letter-spacing: .14em;
  text-transform: uppercase;
}
.eyebrow { color: var(--cyan); }
.hero h1 {
  max-width: 900px;
  margin: 1.25rem 0 1.6rem;
  font-size: clamp(3.5rem, 8.6vw, 8.2rem);
  line-height: .91;
  letter-spacing: -.07em;
}
.hero h1 span { color: var(--lime); }
.hero-copy {
  max-width: 570px;
  margin: 0;
  color: rgba(255, 255, 255, .72);
  font-size: clamp(1.05rem, 2vw, 1.28rem);
}
.hero-actions { display: flex; gap: 1.35rem; align-items: center; margin-top: 2rem; }
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: .75rem 1.25rem;
  border: 1px solid transparent;
  border-radius: 999px;
  font-weight: 800;
  text-decoration: none;
  cursor: pointer;
  transition: transform .2s ease, box-shadow .2s ease, background .2s ease;
}
.button:hover { transform: translateY(-2px); }
.button:focus-visible, .text-link:focus-visible, .download-card:focus-visible, .reset-progress:focus-visible {
  outline: 3px solid var(--orange);
  outline-offset: 3px;
}
.button-primary { color: var(--ink); background: var(--lime); box-shadow: 0 8px 24px rgba(201,242,104,.18); }
.button-ghost { color: var(--ink); background: transparent; border-color: var(--line); }
.text-link { color: var(--white); font-weight: 700; text-underline-offset: 4px; }
.hero-orbit {
  position: absolute;
  right: 7%;
  bottom: 6%;
  width: min(29vw, 350px);
  aspect-ratio: 1;
}
.orbit-ring { position: absolute; inset: 0; border: 1px solid rgba(255,255,255,.22); border-radius: 50%; }
.orbit-ring::before, .orbit-ring::after {
  content: "";
  position: absolute;
  border-radius: 50%;
  border: 1px solid rgba(255,255,255,.12);
}
.orbit-ring::before { inset: 13%; }
.orbit-ring::after { inset: 31%; background: rgba(149,133,255,.16); }
.orbit-core {
  position: absolute;
  inset: 38%;
  z-index: 2;
  display: grid;
  place-items: center;
  border-radius: 50%;
  color: var(--ink);
  background: var(--orange);
  font-size: clamp(1.1rem, 2vw, 1.65rem);
  font-weight: 800;
  line-height: 1;
}
.orbit-core span { display: block; font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace; font-size: .48em; }
.orbit-label { position: absolute; z-index: 3; font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace; font-size: .64rem; letter-spacing: .08em; }
.label-hardware { left: -4%; top: 28%; color: var(--cyan); }
.label-files { right: -2%; top: 53%; color: var(--lime); }
.label-browser { left: 16%; bottom: 4%; color: var(--pink); }

.start-panel, .stations { padding: clamp(4rem, 8vw, 7rem) clamp(1.1rem, 6vw, 7rem); }
.start-panel { background: var(--white); }
.section-heading { display: flex; align-items: flex-start; gap: 1.35rem; margin-bottom: 2.4rem; }
.section-number {
  flex: 0 0 auto;
  padding-top: .35rem;
  color: rgba(16,22,47,.45);
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  font-size: .8rem;
}
.section-heading .kicker { margin: 0 0 .5rem; color: #596078; }
.section-heading h2, .station h2, .finish h2 { margin: 0; letter-spacing: -.045em; line-height: 1.04; }
.section-heading h2 { font-size: clamp(2.2rem, 5vw, 4.5rem); }
.role-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; }
.role-card { padding: 1.8rem; border: 1px solid var(--line); border-radius: var(--radius); background: #fff; }
.role-icon {
  display: grid;
  place-items: center;
  width: 46px;
  aspect-ratio: 1;
  margin-bottom: 1.3rem;
  border-radius: 14px;
  background: var(--paper);
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  font-weight: 800;
}
.role-card:nth-child(1) .role-icon { background: var(--cyan); }
.role-card:nth-child(2) .role-icon { background: var(--lime); }
.role-card:nth-child(3) .role-icon { background: var(--orange); }
.role-card h3 { margin: 0 0 .45rem; font-size: 1.3rem; }
.role-card p { margin: 0; color: #555c70; }
.rules-strip { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; margin-top: 1rem; }
.rules-strip p { margin: 0; padding: 1rem 1.2rem; border-radius: 14px; background: var(--paper); }
.timer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 2rem;
  margin-top: 2rem;
  padding: 1.4rem 1.6rem;
  border-radius: var(--radius);
  color: var(--white);
  background: var(--ink);
}
.timer .kicker { margin: 0; color: var(--cyan); }
.timer-display { margin: .15rem 0 0; font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace; font-size: clamp(2rem, 5vw, 3.5rem); line-height: 1; }
.timer-controls { display: flex; gap: .6rem; }
.timer .button-ghost { color: var(--white); border-color: rgba(255,255,255,.3); }

.stations { background: var(--paper); }
.stations-heading { align-items: end; }
.heading-note { max-width: 360px; margin: 0 0 .5rem auto; color: #5d6376; }
.station {
  --accent: var(--cyan);
  display: grid;
  grid-template-columns: minmax(0, .85fr) minmax(420px, 1.15fr);
  gap: clamp(2rem, 5vw, 6rem);
  margin: 0 auto 1.5rem;
  padding: clamp(1.5rem, 4vw, 3.4rem);
  scroll-margin-top: 95px;
  border: 1px solid var(--line);
  border-radius: calc(var(--radius) + 8px);
  background: color-mix(in srgb, var(--accent) 14%, white);
}
.station-lime { --accent: var(--lime); }
.station-orange { --accent: var(--orange); }
.station-violet { --accent: var(--violet); }
.station-pink { --accent: var(--pink); }
.station-intro { display: grid; grid-template-columns: auto 1fr; gap: 1.25rem; align-content: start; }
.station-index {
  display: grid;
  place-items: center;
  width: 58px;
  aspect-ratio: 1;
  border-radius: 50%;
  background: var(--accent);
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  font-weight: 500;
}
.station .kicker { margin: .45rem 0 .6rem; color: #5b6071; }
.station h2 { font-size: clamp(2.25rem, 4.2vw, 4.4rem); }
.mission-brief { max-width: 460px; margin: 1.2rem 0 1.4rem; font-size: 1.05rem; }
.station-tags { display: flex; flex-wrap: wrap; gap: .45rem; }
.station-tags span { padding: .35rem .65rem; border: 1px solid rgba(16,22,47,.25); border-radius: 999px; font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace; font-size: .68rem; text-transform: uppercase; }
.mission-card { padding: clamp(1.25rem, 3vw, 2rem); border-radius: var(--radius); background: var(--white); box-shadow: var(--shadow); }
.mission-card > p:first-of-type { margin-top: 0; }
.mission-label { color: #646a7d; }
.checklist { display: grid; gap: .05rem; margin: 1.35rem 0; }
.checklist label {
  display: grid;
  grid-template-columns: 24px 1fr;
  gap: .7rem;
  align-items: start;
  padding: .7rem .2rem;
  border-bottom: 1px solid var(--line);
  cursor: pointer;
}
.checklist input { width: 20px; height: 20px; margin: .12rem 0 0; accent-color: var(--ink); }
.checklist label:has(input:checked) span { color: #777d8d; text-decoration: line-through; }
code { padding: .12rem .34rem; border-radius: 5px; background: var(--paper); font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace; font-size: .9em; }
.challenge-callout { padding: .9rem 1rem; border-left: 4px solid var(--accent); background: color-mix(in srgb, var(--accent) 12%, white); }
.final-question { margin: 1.2rem 0 0; font-weight: 800; }
.download-card {
  display: flex;
  align-items: center;
  gap: .85rem;
  margin: 1.2rem 0;
  padding: .9rem 1rem;
  border-radius: 15px;
  color: var(--white);
  background: var(--ink);
  text-decoration: none;
  transition: transform .2s ease;
}
.download-card:hover { transform: translateY(-2px); }
.download-icon { display: grid; place-items: center; width: 38px; aspect-ratio: 1; border-radius: 50%; color: var(--ink); background: var(--accent); font-weight: 800; }
.download-card span:last-child { display: grid; }
.download-card small { color: rgba(255,255,255,.62); font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace; font-size: .68rem; }

.finish { padding: clamp(5rem, 10vw, 9rem) clamp(1.1rem, 8vw, 9rem); color: var(--white); background: var(--ink); text-align: center; }
.finish .kicker { color: var(--lime); }
.finish h2 { max-width: 920px; margin: .8rem auto 1.3rem; font-size: clamp(2.8rem, 6vw, 6rem); }
.finish > p:not(.kicker) { max-width: 660px; margin: 0 auto; color: rgba(255,255,255,.68); font-size: 1.1rem; }
.finish-actions { display: flex; justify-content: center; align-items: center; gap: 1rem; margin-top: 2rem; }
.button-light { color: var(--ink); background: var(--cyan); }
.reset-progress { padding: .6rem; border: 0; color: rgba(255,255,255,.72); background: transparent; text-decoration: underline; text-underline-offset: 4px; cursor: pointer; }
.completion-message { width: fit-content; margin: 2rem auto 0; padding: .9rem 1.2rem; border: 1px solid var(--lime); border-radius: 999px; color: var(--lime); font-weight: 800; }
.completion-message span { display: inline-grid; place-items: center; width: 24px; aspect-ratio: 1; margin-right: .35rem; border-radius: 50%; color: var(--ink); background: var(--lime); }
footer { display: flex; justify-content: space-between; gap: 1rem; padding: 1.2rem clamp(1.1rem, 6vw, 7rem); color: var(--white); background: #090d20; font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace; font-size: .74rem; }
footer p { margin: 0; }

@media (max-width: 900px) {
  .hero { min-height: 630px; }
  .hero-orbit { right: -4%; opacity: .45; }
  .role-grid { grid-template-columns: 1fr; }
  .rules-strip { grid-template-columns: 1fr; }
  .station { grid-template-columns: 1fr; }
  .heading-note { display: none; }
}

@media (max-width: 620px) {
  .site-header { min-height: 62px; }
  .brand span:last-child { display: none; }
  nav a { width: 31px; }
  .hero { min-height: 620px; padding-top: 5rem; }
  .hero h1 { font-size: clamp(3.2rem, 17vw, 5rem); }
  .hero-actions { align-items: flex-start; flex-direction: column; }
  .hero-orbit { width: 240px; right: -65px; bottom: 10px; }
  .section-heading { gap: .8rem; }
  .station-intro { grid-template-columns: 1fr; }
  .timer { align-items: flex-start; flex-direction: column; }
  .timer-controls { width: 100%; }
  .timer-controls .button { flex: 1; }
  .finish-actions { flex-direction: column; }
  footer { align-items: flex-start; flex-direction: column; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: .01ms !important; animation-duration: .01ms !important; animation-iteration-count: 1 !important; }
}