/* ============================================================
   Design tokens, reset, typography, shared UI
   ============================================================ */

:root {
  /* Colour tokens */
  --ink: #f2f3f5;
  --ink-muted: #a9b0c0;
  --ink-dim: #6c7486;
  /* Signature red — a nod to the masthead red of weekly newspapers */
  --economist-red: #e3120b;
  --ignition: #ff6b2b;
  --ignition-hot: #ff9a4d;
  --cyan: #7df9ff;
  --bg-0: #000000;
  --bg-1: #05070f;
  --rule: rgba(255, 255, 255, 0.1);
  --rule-strong: rgba(255, 255, 255, 0.22);
  --panel: rgba(10, 14, 26, 0.58);
  --panel-strong: rgba(8, 12, 22, 0.82);

  /* Type scale — primarily serif (editorial).
     Fraunces is a modern transitional serif close in feel to the paper's
     own book-weight serif. System stack as fallback. */
  --serif: "Fraunces", "Iowan Old Style", "Georgia", "Times New Roman", serif;
  --sans: "Inter", system-ui, -apple-system, "Segoe UI", Helvetica, Arial,
    sans-serif;
  --mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas,
    monospace;

  /* Layout — a narrow stage-illustration column on the left and a wider
     reading column on the right. Values echo newspaper column grids. */
  --content-max: 1240px;
  --gutter: clamp(1.25rem, 3vw, 2.5rem);
  --lane: 36vw;

  /* Motion */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in-out: cubic-bezier(0.37, 0, 0.63, 1);
  --ease-spring: cubic-bezier(0.34, 1.38, 0.64, 1);

  /* Track is content-driven now — each pinned scene sets its own
     min-height directly (gallery 220vh, regnet 460vh, timeline 170vh).
     Setting this to 0 means the track has no forced minimum, so the
     page ends exactly where the last scene ends. */
  --track-vh: 0;

  /* Live values written by the scroll engine */
  --progress: 0;
  --rocket-y: 0;
  --rocket-x: 0;
  --rocket-scale: 1;
  --rocket-rot: 0deg;
  --rocket-shake: 0;
  --stars-opacity: 0;
  --earth-y: 80vh;
  --earth-scale: 1.9;
  --orbits-opacity: 0;
  --launchpad-opacity: 1;
  --hint-opacity: 1;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  background: var(--bg-0);
  color: var(--ink);
  /* Body copy is serif by default — newspaper feel. Sans is reserved for
     technical readouts (altitude HUD, data labels). */
  font-family: var(--serif);
  font-weight: 400;
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  font-feature-settings: "kern", "liga", "onum", "ss01";
}

html {
  scroll-behavior: auto;
  background: var(--bg-0);
}

body {
  overflow-x: hidden;
  min-height: 100vh;
}

::selection {
  background: var(--ignition);
  color: #0a0a0a;
}

a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(125, 249, 255, 0.4);
  transition: color 160ms var(--ease-out), border-color 160ms var(--ease-out);
}
a:hover,
a:focus-visible {
  color: #fff;
  border-bottom-color: #fff;
}

:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
  border-radius: 2px;
}

.skip-link {
  position: fixed;
  top: 0.5rem;
  left: 0.5rem;
  padding: 0.6rem 0.9rem;
  background: var(--ink);
  color: var(--bg-1);
  border: 0;
  border-radius: 4px;
  font: 500 0.85rem/1 var(--sans);
  transform: translateY(-200%);
  transition: transform 200ms var(--ease-out);
  z-index: 100;
}
.skip-link:focus {
  transform: translateY(0);
}

/* ============================================================
   Typography — editorial / broadsheet treatment
   ============================================================ */

/* Hero display — op-ed front-page headline. Tight tracking, generous size,
   lowercase-friendly (no balance for long lines; allow pre-line line
   breaks provided in copy). */
.display {
  font-family: var(--serif);
  font-weight: 500;
  font-size: clamp(2.4rem, 6.4vw, 5.6rem);
  line-height: 1.02;
  letter-spacing: -0.018em;
  margin: 0;
  white-space: pre-line;
  text-wrap: balance;
  font-feature-settings: "kern", "liga", "lnum";
  color: #fafbfc;
}

/* Section / scene headline — like an article head inside a feature spread. */
.scene-heading {
  font-family: var(--serif);
  font-weight: 500;
  font-size: clamp(1.7rem, 3vw, 2.6rem);
  line-height: 1.08;
  letter-spacing: -0.012em;
  margin: 0.4rem 0 0.25rem;
  text-wrap: balance;
  color: #fafbfc;
}

/* Deck / standfirst under the main headline — italic lead line. */
.subtitle {
  font-family: var(--serif);
  font-style: italic;
  font-weight: 400;
  font-size: clamp(1.15rem, 1.9vw, 1.55rem);
  line-height: 1.35;
  color: var(--ink);
  margin: 1rem 0 0;
  text-wrap: balance;
  max-width: 40ch;
}

/* Lede — first paragraph under a section heading. Upright serif, slightly
   larger than body, measured column width. NOT italic — italic is reserved
   for standfirsts and pull quotes, per classic editorial practice. */
.scene-lede {
  font-family: var(--serif);
  font-weight: 400;
  font-style: normal;
  font-size: clamp(1.02rem, 1.35vw, 1.2rem);
  line-height: 1.45;
  color: var(--ink);
  margin: 0.4rem 0 0;
  max-width: 54ch;
  text-wrap: pretty;
}

/* Drop cap on the lede paragraph — a classic newspaper flourish. The first
   letter drops three lines and picks up the signature red accent. */
.scene-lede.has-dropcap::first-letter {
  font-family: var(--serif);
  font-weight: 600;
  font-size: 3em;
  line-height: 0.88;
  float: left;
  padding: 0.08em 0.12em 0 0;
  margin: 0.02em 0.08em 0 0;
  color: var(--economist-red);
  font-feature-settings: "lnum";
}

/* Kicker / section label (ACT I, ACT II …). Small-cap sans, subtle red
   leading rule to the left — feels like a newspaper rubric. */
.kicker {
  font-family: var(--sans);
  font-weight: 700;
  font-size: 0.72rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--economist-red);
  margin: 0 0 0.35rem;
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
}
.kicker::before {
  content: "";
  width: 1.6rem;
  height: 2px;
  background: var(--economist-red);
  flex: 0 0 auto;
}

/* Byline — "By AUTHOR · LOCATION" in small-cap sans, restrained. */
.byline {
  font-family: var(--sans);
  font-weight: 600;
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  color: var(--ink-muted);
  margin: 1.6rem 0 0;
  text-transform: uppercase;
}

/* Altitude chip — kept technical (mono) since it represents an instrument
   readout rather than editorial copy. */
.altitude-chip {
  display: inline-block;
  padding: 0.25rem 0.6rem;
  border: 1px solid var(--rule-strong);
  border-radius: 999px;
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  color: var(--cyan);
  text-transform: uppercase;
  margin: 0 0 0.4rem;
  background: rgba(125, 249, 255, 0.04);
}

/* Thin section rule under the scene heading — echoes the hairline dividers
   in broadsheet layouts. */
.scene-rule {
  width: 3rem;
  height: 2px;
  background: var(--economist-red);
  margin: 0.1rem 0 0.7rem;
  border: 0;
}

/* --- Reduced motion: deliver a readable static version --- */

.reduced-motion .stage {
  position: relative;
  height: 62vh;
  min-height: 420px;
}
.reduced-motion .track {
  --track-vh: 0;
}
.reduced-motion .scene {
  height: auto !important;
  min-height: unset !important;
  padding-block: 4rem;
}
.reduced-motion .scene-inner {
  position: static !important;
  transform: none !important;
  opacity: 1 !important;
}
.reduced-motion .rocket,
.reduced-motion .launchpad,
.reduced-motion .hud,
.reduced-motion .scroll-hint {
  display: none;
}

/* --- Text fallback (always available via skip link) --- */

.text-fallback {
  padding: 3rem var(--gutter);
  max-width: 72ch;
  margin: 0 auto;
  border-top: 1px solid var(--rule);
}
.text-fallback h2 {
  font-family: var(--serif);
  font-size: 1.8rem;
}