/* Vission — a vision for fission.
   Light by default, dark when the OS asks for it. One reactor-glow accent.
   Display: Space Grotesk. Mono: JetBrains Mono. Every colour is a token below. */

@font-face {
  font-family: "Space Grotesk";
  src: url("assets/fonts/space-grotesk-latin.woff2") format("woff2");
  font-weight: 300 700;
  font-display: swap;
}
@font-face {
  font-family: "JetBrains Mono";
  src: url("assets/fonts/jetbrains-mono-latin.woff2") format("woff2");
  font-weight: 400 700;
  font-display: swap;
}

:root {
  color-scheme: light dark;
  --bg: #f7f5f0;
  --bg-2: #efece4;
  --bg-3: #e5e1d7;
  --bg-glass: rgba(247, 245, 240, 0.8);
  --ink: #101214;
  --ink-2: #3b3e42;
  --muted: #666a6e;
  --line: rgba(16, 18, 20, 0.14);
  --line-strong: rgba(16, 18, 20, 0.4);
  --accent: #0b7a8f;
  --accent-hover: #09677a;
  --accent-deep: #0a6578;
  --accent-ink: #ffffff;
  --accent-soft: rgba(11, 122, 143, 0.12);
  --accent-rgb: 11, 122, 143;
  --dot-rgb: 16, 18, 20;
  --dot-alpha: 0.2;
  --warn: #b0481f;
  --scrim-0: rgba(247, 245, 240, 0);
  --scrim-1: rgba(247, 245, 240, 0.86);
  /* Photo banner: always dark glass over a photo, light type, in both themes. */
  --banner-ink: #f2f2ee;
  --banner-ink-2: #d6d6d0;
  --banner-line: rgba(242, 242, 238, 0.3);
  --banner-scrim-0: rgba(5, 6, 7, 0.1);
  --banner-scrim-1: rgba(5, 6, 7, 0.6);
  --banner-scrim-2: rgba(5, 6, 7, 0.92);
  --wrap: 1200px;
  --gutter: clamp(16px, 4vw, 48px);
  --display: "Space Grotesk", "Inter", system-ui, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --radius: 4px;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #050607;
    --bg-2: #0c0e10;
    --bg-3: #14171a;
    --bg-glass: rgba(5, 6, 7, 0.72);
    --ink: #f2f2ee;
    --ink-2: #c9c9c2;
    --muted: #8a8c88;
    --line: rgba(242, 242, 238, 0.14);
    --line-strong: rgba(242, 242, 238, 0.4);
    --accent: #5de4ff;
    --accent-hover: #8df0ff;
    --accent-deep: #1ab6d6;
    --accent-ink: #042a33;
    --accent-soft: rgba(93, 228, 255, 0.12);
    --accent-rgb: 93, 228, 255;
    --dot-rgb: 242, 242, 238;
    --dot-alpha: 0.16;
    --warn: #ff8a5b;
    --scrim-0: rgba(5, 6, 7, 0);
    --scrim-1: rgba(5, 6, 7, 0.85);
  }
}
:root[data-theme="dark"] {
  --bg: #050607;
  --bg-2: #0c0e10;
  --bg-3: #14171a;
  --bg-glass: rgba(5, 6, 7, 0.72);
  --ink: #f2f2ee;
  --ink-2: #c9c9c2;
  --muted: #8a8c88;
  --line: rgba(242, 242, 238, 0.14);
  --line-strong: rgba(242, 242, 238, 0.4);
  --accent: #5de4ff;
  --accent-hover: #8df0ff;
  --accent-deep: #1ab6d6;
  --accent-ink: #042a33;
  --accent-soft: rgba(93, 228, 255, 0.12);
  --accent-rgb: 93, 228, 255;
  --dot-rgb: 242, 242, 238;
  --dot-alpha: 0.16;
  --warn: #ff8a5b;
  --scrim-0: rgba(5, 6, 7, 0);
  --scrim-1: rgba(5, 6, 7, 0.85);
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--display);
  font-size: 1.0625rem;
  line-height: 1.6;
  overflow-x: hidden;
}
img { max-width: 100%; height: auto; display: block; }
figure { margin: 0; }
a { color: inherit; text-decoration-color: var(--line-strong); text-underline-offset: 3px; }
a:hover { text-decoration-color: var(--accent); }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }
h1, h2, h3, h4 { margin: 0; line-height: 1.05; letter-spacing: -0.025em; font-weight: 500; }
h2 { font-size: clamp(1.9rem, 1.2rem + 2.6vw, 3.4rem); max-width: 22ch; margin-bottom: 28px; }
h3 { font-size: 1.25rem; letter-spacing: -0.01em; margin-bottom: 8px; }
p { margin: 0 0 1em; }
p:last-child { margin-bottom: 0; }
sup { font-size: 0.68em; line-height: 0; white-space: nowrap; color: var(--muted); }
.wrap { width: min(var(--wrap), 100% - 2 * var(--gutter)); margin-inline: auto; }
.mono { font-family: var(--mono); font-size: 0.8rem; letter-spacing: 0.02em; }
.label { text-transform: uppercase; letter-spacing: 0.14em; color: var(--muted); margin-bottom: 18px; }
.small { font-size: 0.74rem; color: var(--muted); }
.lede { font-size: 1.2rem; line-height: 1.5; color: var(--ink); }
.section p:not(.lede):not(.mono):not(.label) { color: var(--ink-2); }
.narrow { max-width: 62ch; }

.skip-link { position: absolute; left: -999px; top: 8px; background: var(--accent); color: var(--accent-ink); padding: 8px 12px; z-index: 100; font-family: var(--mono); }
.skip-link:focus { left: 8px; }

/* Buttons */
.btn { display: inline-flex; align-items: center; gap: 8px; padding: 12px 20px; border: 1px solid var(--line); border-radius: 999px; font-family: var(--mono); font-size: 0.82rem; text-transform: uppercase; letter-spacing: 0.08em; text-decoration: none; cursor: pointer; transition: background .2s, color .2s, border-color .2s, transform .2s; background: transparent; color: var(--ink); }
.btn:hover { border-color: var(--ink); transform: translateY(-1px); }
.btn-accent { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); font-weight: 700; }
.btn-accent:hover { background: var(--accent-hover); border-color: var(--accent-hover); }
.btn-ghost { border-color: var(--line-strong); }

/* Header */
.site-header { position: sticky; top: 0; z-index: 50; background: var(--bg-glass); backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px); border-bottom: 1px solid var(--line); }
.header-inner { display: flex; align-items: center; justify-content: space-between; gap: 20px; min-height: 64px; }
.brand { display: inline-flex; align-items: center; gap: 10px; text-decoration: none; }
.brand-mark { width: 30px; height: 30px; color: var(--ink); }
.brand-name { font-family: var(--mono); font-weight: 700; letter-spacing: 0.3em; font-size: 0.95rem; }
.site-nav { display: flex; align-items: center; gap: 22px; font-family: var(--mono); font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.08em; }
.site-nav a:not(.btn) { text-decoration: none; color: var(--ink-2); }
.site-nav a:not(.btn):hover { color: var(--accent); }
.site-nav .btn { padding: 8px 16px; }
.nav-toggle { display: none; background: none; border: 1px solid var(--line); border-radius: 6px; color: var(--ink); width: 42px; height: 42px; padding: 8px; cursor: pointer; }
.nav-toggle svg { width: 100%; height: 100%; }
@media (max-width: 860px) {
  .nav-toggle { display: inline-flex; }
  .site-nav { display: none; position: absolute; left: 0; right: 0; top: 100%; flex-direction: column; align-items: stretch; gap: 0; background: var(--bg-2); border-bottom: 1px solid var(--line); padding: 8px var(--gutter) 16px; }
  .site-nav.open { display: flex; }
  .site-nav a { padding: 12px 0; border-bottom: 1px solid var(--line); }
  .site-nav .btn { margin-top: 12px; justify-content: center; border-bottom: 0; }
}

/* Hero with fission lattice */
.hero { position: relative; min-height: calc(100vh - 64px); min-height: calc(100svh - 64px); display: flex; flex-direction: column; justify-content: flex-end; overflow: hidden; isolation: isolate; }
.lattice, .lattice-static { position: absolute; inset: 0; width: 100%; height: 100%; z-index: -1; }
.lattice-static { display: none; background-image: radial-gradient(circle, rgba(var(--dot-rgb), 0.22) 1.6px, transparent 2px); background-size: 34px 34px; background-position: 17px 17px; }
.lattice-static::after { content: ""; position: absolute; inset: 0; background: radial-gradient(ellipse at 50% 40%, var(--accent-soft), transparent 60%); }
.no-js .lattice { display: none; }
.no-js .lattice-static, .reduced-motion .lattice-static { display: block; }
.reduced-motion .lattice { display: none; }
.hero::after { content: ""; position: absolute; inset: 0; z-index: -1; background: linear-gradient(180deg, var(--scrim-0) 30%, var(--scrim-1) 75%, var(--bg) 100%); pointer-events: none; }
.hero-inner { padding: clamp(80px, 14vh, 160px) 0 40px; }
.eyebrow { color: var(--muted); text-transform: uppercase; letter-spacing: 0.16em; margin-bottom: 26px; }
.hero h1 { font-size: clamp(3rem, 2rem + 7vw, 8.5rem); font-weight: 500; letter-spacing: -0.04em; max-width: 12ch; margin-bottom: 26px; }
.hero h1::after { content: ""; display: block; width: 0.6em; height: 0.08em; background: var(--accent); margin-top: 0.2em; }
.hero-lede { font-size: clamp(1.1rem, 1rem + 0.6vw, 1.45rem); max-width: 50ch; color: var(--ink-2); margin-bottom: 34px; }
.cta-row { display: flex; flex-wrap: wrap; gap: 12px; }
.hero-ticker { list-style: none; margin: 0; padding: 18px var(--gutter); display: flex; flex-wrap: wrap; gap: 10px 40px; border-top: 1px solid var(--line); color: var(--muted); text-transform: uppercase; letter-spacing: 0.1em; background: var(--bg); }
.hero-ticker .num { color: var(--accent); font-weight: 700; margin-right: 8px; }

/* Photo band */
.band { position: relative; }
.band img { width: 100%; max-height: 82vh; object-fit: cover; }
.band figcaption { display: flex; justify-content: space-between; gap: 20px; flex-wrap: wrap; padding: 14px 0; color: var(--muted); border-bottom: 1px solid var(--line); }
.credit a { color: var(--muted); }

/* Sections */
.section { padding: clamp(72px, 10vw, 140px) 0; border-bottom: 1px solid var(--line); }
.section.alt { background: var(--bg-2); }
.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(28px, 5vw, 72px); align-items: start; }
.two-col.reverse > :first-child { order: 0; }
@media (max-width: 900px) { .two-col { grid-template-columns: 1fr; } .two-col.reverse > figure { order: 2; } }
.card-img img { border-radius: var(--radius); }
.card-img figcaption, .gallery-2 figcaption, .people figcaption { color: var(--muted); margin-top: 10px; }
.card-img figcaption a, .gallery-2 figcaption a, .people figcaption a, .compare .small a, .qa .small a { color: var(--muted); }

/* Stats */
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); margin-top: clamp(48px, 7vw, 96px); }
.stats.three { grid-template-columns: repeat(3, 1fr); }
.stat { background: var(--bg); padding: 28px 24px 26px; }
.alt .stat { background: var(--bg-2); }
.stat .label { margin-bottom: 14px; }
.stat .big { font-size: clamp(2.6rem, 2rem + 2vw, 4rem); font-weight: 500; letter-spacing: -0.04em; line-height: 1; color: var(--ink); margin-bottom: 8px; }
.stat .unit { font-family: var(--mono); font-size: 0.9rem; letter-spacing: 0.04em; margin-left: 6px; color: var(--accent); vertical-align: middle; }
.stat .small { margin-bottom: 14px; color: var(--accent-deep); }
.stat p:last-child { color: var(--ink-2); font-size: 0.95rem; }
@media (max-width: 1000px) { .stats, .stats.three { grid-template-columns: 1fr 1fr; } }
@media (max-width: 520px) { .stats, .stats.three { grid-template-columns: 1fr; } }

/* Pump section */
.pump-grid { display: grid; grid-template-columns: 1.1fr 1fr; gap: clamp(28px, 5vw, 72px); align-items: start; }
@media (max-width: 900px) { .pump-grid { grid-template-columns: 1fr; } }
.pull { border-left: 3px solid var(--accent); padding: 6px 0 6px 20px; font-size: clamp(1.3rem, 1rem + 1.2vw, 1.9rem); line-height: 1.3; letter-spacing: -0.02em; color: var(--ink); margin: 8px 0 24px; }
.pull em { font-style: normal; color: var(--accent-deep); }

/* Compare */
.compare { display: grid; grid-template-columns: 1fr 1fr; gap: 1px; background: var(--line); border: 1px solid var(--line); margin: 0 0 clamp(32px, 5vw, 56px); }
.compare-item { background: var(--bg-2); display: flex; flex-direction: column; }
.compare-item img { aspect-ratio: 4/3; object-fit: cover; width: 100%; filter: saturate(0.9); }
.compare-item.bad img { filter: saturate(0.45) contrast(1.05); }
.compare-item figcaption { padding: 24px; }
.compare-item.good .label { color: var(--accent); }
.compare-item.bad .label { color: var(--warn); }
@media (max-width: 760px) { .compare { grid-template-columns: 1fr; } }

/* Facts list (datacenters) */
.facts { list-style: none; margin: 24px 0 0; padding: 0; border-top: 1px solid var(--line); }
.facts li { display: grid; grid-template-columns: 92px 1fr; gap: 16px; padding: 12px 0; border-bottom: 1px solid var(--line); font-size: 0.98rem; color: var(--ink-2); }
.facts .when { color: var(--accent-deep); padding-top: 3px; }
@media (max-width: 520px) { .facts li { grid-template-columns: 1fr; gap: 4px; } }

/* Gallery */
.gallery-2 { display: grid; gap: 20px; }
.gallery-2 img { border-radius: var(--radius); aspect-ratio: 16/10; object-fit: cover; width: 100%; }

/* Q and A */
.qa { display: grid; grid-template-columns: repeat(3, 1fr); gap: clamp(24px, 4vw, 56px); }
.qa article { border-top: 1px solid var(--line); padding-top: 22px; }
.qa .q { font-size: 1.3rem; letter-spacing: -0.015em; line-height: 1.25; color: var(--ink); margin: 0 0 14px; }
.qa .q::before { content: "Q"; display: inline-block; font-family: var(--mono); font-size: 0.75rem; color: var(--warn); margin-right: 10px; vertical-align: middle; letter-spacing: 0.1em; }
.qa .a { color: var(--ink-2); font-size: 0.98rem; }
.qa .a::before { content: "A"; display: inline-block; font-family: var(--mono); font-size: 0.75rem; color: var(--accent); margin-right: 10px; letter-spacing: 0.1em; }
.qa img { margin-top: 20px; border-radius: var(--radius); aspect-ratio: 16/9; object-fit: cover; width: 100%; }
.qa .small { margin-top: 8px; }
@media (max-width: 860px) { .qa { grid-template-columns: 1fr; } }

/* World banner */
.banner-section { position: relative; min-height: 70vh; display: flex; align-items: flex-end; isolation: isolate; overflow: hidden; color: var(--banner-ink); }
.banner-section img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; object-position: 50% 45%; filter: saturate(1.3) contrast(1.08); z-index: -2; }
.banner-section::before { content: ""; position: absolute; inset: 0; z-index: -1; background: linear-gradient(180deg, var(--banner-scrim-0), var(--banner-scrim-1) 45%, var(--banner-scrim-2) 100%); }
.banner-inner { padding: clamp(80px, 12vw, 140px) 0 48px; }
.banner-inner .label { color: var(--banner-ink-2); }
.banner-inner h2 { color: var(--banner-ink); }
.world-list { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 16px 32px; max-width: 1000px; color: var(--banner-ink-2); font-size: 0.86rem; line-height: 1.55; }
.world-list li { border-top: 1px solid var(--banner-line); padding-top: 12px; }
.world-list strong { color: var(--banner-ink); display: block; margin-bottom: 4px; }
.banner-inner .credit { margin-top: 32px; color: var(--banner-ink-2); }
.banner-inner .credit a { color: var(--banner-ink-2); }

/* Asks */
.asks { list-style: none; margin: 0 0 clamp(40px, 6vw, 64px); padding: 0; display: grid; grid-template-columns: 1fr 1fr; gap: 0 48px; }
.asks li { display: grid; grid-template-columns: 48px 1fr; gap: 16px; padding: 26px 0; border-top: 1px solid var(--line); }
.asks .num { color: var(--accent); padding-top: 4px; }
.asks h3 { color: var(--ink); }
.asks p { font-size: 0.98rem; }
@media (max-width: 860px) { .asks { grid-template-columns: 1fr; } }
.people { display: grid; grid-template-columns: 1fr; gap: 20px; }
.people img { border-radius: var(--radius); aspect-ratio: 5/2; object-fit: cover; width: 100%; }

/* Close */
.join { background: radial-gradient(ellipse at 20% 0%, var(--accent-soft), transparent 50%), var(--bg); text-align: left; }
.join h2 { font-size: clamp(2.4rem, 1.5rem + 4vw, 5rem); max-width: 16ch; }
.join .lede { max-width: 48ch; }
.share-row { display: flex; flex-wrap: wrap; align-items: center; gap: 14px; margin-top: 28px; }
.share-status { font-family: var(--mono); font-size: 0.8rem; color: var(--accent-deep); min-height: 1.2em; }

/* Sources */
.sources { padding: 56px 0 72px; border-top: 1px solid var(--line); }
.sources ol { padding-left: 1.4em; color: var(--muted); font-size: 0.74rem; line-height: 1.7; max-width: 900px; columns: 2; column-gap: 40px; }
.sources li { break-inside: avoid; margin-bottom: 8px; }
.sources a { color: var(--ink-2); word-break: break-all; }
@media (max-width: 760px) { .sources ol { columns: 1; } }

/* Footer */
.site-footer { border-top: 1px solid var(--line); padding: 48px 0 32px; background: var(--bg-2); }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 40px; }
.footer-grid ul { list-style: none; margin: 0; padding: 0; }
.footer-grid li { margin-bottom: 8px; }
.footer-grid a { text-decoration: none; color: var(--ink-2); }
.footer-grid a:hover { color: var(--accent); }
.footer-grid .small { margin-top: 16px; max-width: 48ch; line-height: 1.6; }
.copyright { margin-top: 40px; padding-top: 20px; border-top: 1px solid var(--line); }
@media (max-width: 760px) { .footer-grid { grid-template-columns: 1fr; gap: 28px; } }

/* Legal page */
.legal { padding: 48px 0 80px; }
.legal .prose { max-width: 70ch; }
.legal h1 { font-size: clamp(2rem, 1.4rem + 2.4vw, 3.2rem); margin-bottom: 18px; }
.legal h2 { font-size: 1.3rem; margin: 36px 0 10px; max-width: none; }
.legal p { color: var(--ink-2); }

/* Reveal */
.reveal { opacity: 0; transform: translateY(14px); transition: opacity .7s ease, transform .7s ease; }
.reveal.in, .no-js .reveal, .reduced-motion .reveal { opacity: 1; transform: none; }

/* Theme toggle */
.theme-toggle { display: inline-flex; align-items: center; gap: 6px; margin-left: auto; background: none; border: 1px solid var(--line); border-radius: 999px; padding: 5px 12px; font-family: var(--mono); font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.08em; color: var(--ink-2); cursor: pointer; line-height: 1.4; }
.theme-toggle:hover { color: var(--ink); border-color: var(--ink); }
@media (max-width: 860px) { .theme-toggle { margin-left: auto; margin-right: 10px; } }