/* Kessler Cascade landing page. The app's own palette: near-black space, cool blue instrument lines, orange debris. */
:root {
  color-scheme: dark;
  --bg: #03060b;
  --bg-sunk: #02040a;
  --line: rgba(120, 170, 220, 0.22);
  --line-strong: rgba(120, 170, 220, 0.4);
  --text: #d8e4f0;
  --text-dim: #8095aa;
  --accent: #7fd1ff;
  --debris: #ff8a4c;
  --amber: #e3b341;
  --head: "Chakra Petch", "Segoe UI", system-ui, sans-serif;
  --sans: "IBM Plex Sans", system-ui, "Segoe UI", Roboto, Arial, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, Consolas, monospace;
  --gutter: clamp(16px, 4vw, 48px);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 4.5rem; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
body {
  margin: 0;
  background: var(--bg);
  background-image:
    radial-gradient(1100px 560px at 85% -8%, rgba(127, 209, 255, 0.1), transparent 60%),
    radial-gradient(800px 480px at -10% 35%, rgba(255, 138, 76, 0.05), transparent 60%);
  background-repeat: no-repeat;
  color: var(--text);
  font: 17px/1.65 var(--sans);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
a { color: var(--accent); text-underline-offset: 3px; }
a:hover { color: #b6e6ff; }
h1, h2, h3 { font-family: var(--head); font-weight: 600; line-height: 1.1; margin: 0 0 0.6em; letter-spacing: 0.01em; }
h1 { font-size: clamp(2.2rem, 7vw, 4.8rem); text-transform: uppercase; letter-spacing: 0.05em; color: var(--accent); overflow-wrap: anywhere; }
h2 { font-size: clamp(1.55rem, 3vw, 2.2rem); }
h3 { font-size: 1.1rem; }
p { margin: 0 0 1em; }

/* top bar */
.bar {
  position: fixed; inset: 0 0 auto 0; z-index: 10;
  display: flex; align-items: center; justify-content: space-between; gap: 1rem;
  padding: 0.75rem var(--gutter);
  transition: background 0.25s, border-color 0.25s;
  border-bottom: 1px solid transparent;
}
.bar.solid { background: rgba(3, 6, 11, 0.92); border-color: var(--line); backdrop-filter: blur(8px); }
.brand { font: 600 0.95rem/1 var(--head); letter-spacing: 0.18em; text-transform: uppercase; color: var(--accent); text-decoration: none; }
.bar nav { display: flex; align-items: center; gap: 1.4rem; font-size: 0.92rem; }
.bar nav a { color: var(--text-dim); text-decoration: none; }
.bar nav a:hover { color: var(--text); }
.bar nav a.cta { color: var(--bg); background: var(--accent); padding: 0.35rem 0.95rem; border-radius: 4px; font-weight: 600; }
.bar nav a.cta:hover { background: #b6e6ff; color: var(--bg); }
@media (max-width: 720px) {
  .bar nav a:not(.cta) { display: none; }
  .bar nav a.cta { font-size: 0.8rem; padding: 0.35rem 0.7rem; }
  .brand { font-size: 0.78rem; letter-spacing: 0.1em; }
}

/* buttons */
.buttons { display: flex; flex-wrap: wrap; gap: 0.75rem; margin: 1.6rem 0 0.8rem; }
.button {
  display: inline-block; padding: 0.7rem 1.3rem; border-radius: 4px;
  border: 1px solid var(--accent); color: var(--accent); text-decoration: none; font-weight: 500;
}
.button:hover { background: rgba(127, 209, 255, 0.1); color: var(--accent); }
.button.primary { background: var(--accent); color: var(--bg); font-weight: 600; }
.button.primary:hover { background: #b6e6ff; color: var(--bg); }
.button.quiet { border-color: var(--line); color: var(--text-dim); }
.button.quiet:hover { color: var(--text); border-color: var(--text-dim); background: none; }

/* hero */
.hero {
  min-height: 100vh;
  display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); gap: clamp(1.5rem, 4vw, 4rem); align-items: center;
  padding: 6rem var(--gutter) 4rem; max-width: 1500px; margin: 0 auto;
}
.pill {
  display: inline-flex; align-items: center; gap: 0.5rem; margin-bottom: 1.4rem;
  font: 500 0.78rem/1 var(--mono); letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--amber); border: 1px solid rgba(227, 179, 65, 0.45); border-radius: 99px; padding: 0.45rem 0.8rem;
}
.pill .dot { width: 7px; height: 7px; border-radius: 50%; background: var(--amber); box-shadow: 0 0 10px var(--amber); }
.pitch { font-size: 1.2rem; color: var(--text); }
.sub { color: var(--text-dim); }
.fine { color: var(--text-dim); font-size: 0.85rem; }
@media (max-width: 960px) { .hero { grid-template-columns: 1fr; min-height: 0; padding-top: 5.5rem; } }

/* a framed screen for every clip */
.screen { margin: 0; min-width: 0; }
.screen video {
  display: block; width: 100%; height: auto; aspect-ratio: 16 / 9; background: var(--bg-sunk);
  border: 1px solid var(--line); border-radius: 8px;
  box-shadow: 0 30px 80px -30px rgba(0, 0, 0, 0.9), 0 0 0 1px rgba(127, 209, 255, 0.05);
}
.screen figcaption { margin-top: 0.7rem; color: var(--text-dim); font-size: 0.82rem; font-family: var(--mono); }
.hero-screen video { box-shadow: 0 40px 120px -30px rgba(255, 138, 76, 0.18), 0 30px 80px -30px rgba(0, 0, 0, 0.9); }
.tabs { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-top: 0.8rem; }
.tabs button {
  font: 500 0.82rem/1 var(--mono); color: var(--text-dim); background: rgba(127, 209, 255, 0.06);
  border: 1px solid var(--line); border-radius: 4px; padding: 0.55rem 0.8rem; cursor: pointer;
}
.tabs button:hover { color: var(--text); border-color: var(--line-strong); }
.tabs button.on { color: var(--bg); background: var(--accent); border-color: var(--accent); }
.tabs button:focus-visible, .button:focus-visible, a:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

/* premise */
.premise { max-width: 46rem; margin: 2rem auto 5rem; padding: 0 var(--gutter); }
.premise p { font-family: var(--head); font-weight: 500; font-size: clamp(1.1rem, 2.1vw, 1.45rem); line-height: 1.5; color: var(--text); }

/* chapters */
.chapter {
  display: grid; grid-template-columns: minmax(0, 7fr) minmax(0, 4fr); gap: clamp(1.5rem, 4vw, 3.5rem); align-items: center;
  max-width: 1400px; margin: 0 auto 7rem; padding: 0 var(--gutter);
}
.chapter.flip { grid-template-columns: minmax(0, 4fr) minmax(0, 7fr); }
.chapter.flip .screen { order: 2; }
.kicker { font: 500 0.78rem/1 var(--mono); letter-spacing: 0.12em; text-transform: uppercase; color: var(--accent); margin-bottom: 0.9rem; }
.copy { min-width: 0; }
.copy p { color: var(--text); }
.copy .data { color: var(--text-dim); font-size: 0.86rem; border-left: 2px solid var(--line-strong); padding-left: 0.8rem; }
.copy .miss { font-size: 0.95rem; border-left: 2px solid var(--debris); padding-left: 0.8rem; color: var(--text); }
.copy .miss b { color: var(--debris); font-weight: 600; }
@media (max-width: 900px) {
  .chapter, .chapter.flip { grid-template-columns: 1fr; margin-bottom: 4.5rem; }
  .chapter.flip .screen { order: 0; }
}

/* how it was made */
.made { max-width: 1100px; margin: 0 auto 6rem; padding: 0 var(--gutter); }
.made h2 { margin-bottom: 1rem; }
.story > p { max-width: 46rem; }
.steps { max-width: 52rem; padding-left: 1.2rem; margin: 0 0 2rem; color: var(--text); }
.steps li { margin-bottom: 0.6rem; }
.steps b { color: var(--accent); font-weight: 600; }
.strip { display: grid; grid-template-columns: repeat(auto-fill, minmax(170px, 1fr)); gap: 0.8rem; margin: 0 0 2rem; }
.strip figure { margin: 0; min-width: 0; }
.strip img { display: block; width: 100%; height: auto; border: 1px solid var(--line); border-radius: 6px; }
.strip figcaption { font: 400 0.74rem/1.3 var(--mono); color: var(--text-dim); margin-top: 0.4rem; }
.who { max-width: 52rem; color: var(--text-dim); font-size: 0.95rem; }
.credits-h { margin-top: 1.8rem; color: var(--text-dim); font: 500 0.78rem/1 var(--mono); letter-spacing: 0.12em; text-transform: uppercase; }
.credits { padding-left: 1.1rem; color: var(--text-dim); font-size: 0.88rem; max-width: 52rem; }
.credits b { color: var(--text); font-weight: 500; }

/* closing */
.final { text-align: center; max-width: 46rem; margin: 0 auto 6rem; padding: 0 var(--gutter); }
.final .buttons { justify-content: center; }
footer { border-top: 1px solid var(--line); padding: 1.6rem var(--gutter) 2.4rem; color: var(--text-dim); font-size: 0.82rem; }
footer p { max-width: 60rem; margin: 0 auto; }