/* Downstream4.eu — Modernist design system tokens plus the site layer.
   Tokens are ported as-is from the design handoff (_ds/modernist/styles.css). */

:root {
  --color-bg: #f3f2f2;
  --color-surface: #eae9e9;
  --color-text: #201e1d;
  --color-accent: #ec3013;
  --color-divider: color-mix(in srgb, #201e1d 40%, transparent);

  --color-neutral-100: #f8f4f4;
  --color-neutral-800: #444141;

  --color-accent-100: #fff2ef;
  --color-accent-600: #dd2b0f;
  --color-accent-700: #ae1800;
  --color-accent-800: #7c1405;

  --font-heading: "Archivo", system-ui, sans-serif;
  --font-heading-weight: 800;
  --font-body: "Archivo", system-ui, sans-serif;

  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-6: 24px;
  --space-8: 32px;

  --radius-md: 0px;

  --page-gutter: clamp(20px, 5vw, 72px);
  --nav-gutter: clamp(16px, 4vw, 56px);
}

/* — base — */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: 15px; line-height: 1.55; font-weight: 400;
  text-wrap: pretty;
}
h1, h2, h3, h4 {
  font-family: var(--font-heading); font-weight: var(--font-heading-weight);
  line-height: 1.12; letter-spacing: -0.015em; margin: 0 0 var(--space-2);
}
p { margin: 0 0 var(--space-3); }
a { color: var(--color-accent); text-underline-offset: 3px; }
a:hover { color: var(--color-accent-600); }
img { display: block; max-width: 100%; }
:focus { outline: none; }
:focus-visible { outline: 2px solid var(--color-accent); outline-offset: 2px; }
::selection { background: color-mix(in srgb, var(--color-accent) 30%, transparent); }

/* — buttons — */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  cursor: pointer; text-decoration: none;
  font-family: var(--font-heading); font-weight: var(--font-heading-weight);
  font-size: 14px; line-height: 1.2; color: var(--color-text);
  background: transparent; border: 1px solid transparent;
  padding: var(--space-2) calc(var(--space-3) * 1.2);
  border-radius: var(--radius-md);
}
.btn-primary { background: var(--color-accent); color: var(--color-bg); }
.btn-primary:hover { background: var(--color-accent-600); color: var(--color-bg); }
.btn-primary:active { background: var(--color-accent-700); }
.btn-secondary { border-color: var(--color-divider); }
.btn-secondary:hover { background: color-mix(in srgb, var(--color-text) 7%, transparent); color: var(--color-text); }
.btn-secondary:active { background: color-mix(in srgb, var(--color-text) 14%, transparent); }

/* — tags — */
.tag {
  display: inline-flex; align-items: center; font-size: 11px;
  letter-spacing: 0.02em; padding: 3px 10px;
  border-radius: calc(var(--radius-md) * 0.75);
}
.tag-accent { background: var(--color-accent-100); color: var(--color-accent-800); }
.tag-neutral { background: var(--color-neutral-100); color: var(--color-neutral-800); }

/* — navigation — */
.nav {
  display: flex; align-items: center; gap: var(--space-4);
  padding: var(--space-3) var(--nav-gutter);
  border-bottom: 2px solid var(--color-divider);
}
.nav a { color: inherit; text-decoration: none; font-size: 14px; white-space: nowrap; }
.nav a:hover { color: var(--color-accent); }
.nav a.btn-primary, .nav a.btn-primary:hover { color: var(--color-bg); }

/* ══════════════════════════════════════════════════════════════════════
   Site layer
   ══════════════════════════════════════════════════════════════════════ */

.container { max-width: 1280px; margin: 0 auto; padding-inline: var(--page-gutter); }

.wordmark {
  font-family: var(--font-heading); font-weight: 800; font-size: 16px;
  letter-spacing: -0.01em; white-space: nowrap; color: var(--color-text);
}
.wordmark .four { color: var(--color-accent); }
.wordmark .tld { color: color-mix(in srgb, var(--color-text) 55%, transparent); }

.eyebrow {
  display: block; font-family: var(--font-heading); font-weight: 800; font-size: 13px;
  letter-spacing: 0.1em; text-transform: uppercase; color: var(--color-accent-700);
}

.lead {
  font-size: 19px; line-height: 1.6; max-width: 56ch;
  color: color-mix(in srgb, var(--color-text) 88%, transparent);
}

.actions { display: flex; gap: 12px; flex-wrap: wrap; }

.section-title { font-size: clamp(28px, 3.2vw, 40px); line-height: 1.15; letter-spacing: -0.015em; margin: 0; }

.section-head {
  display: flex; flex-wrap: wrap; justify-content: space-between; align-items: flex-end;
  gap: 16px 40px; margin-bottom: 36px;
}
.section-hint { font-size: 14px; color: color-mix(in srgb, var(--color-text) 65%, transparent); }

/* Image placeholder for pending photography and logos */
.placeholder {
  display: flex; align-items: center; justify-content: center; text-align: center;
  padding: var(--space-2);
  background: var(--color-surface);
  border: 2px dashed var(--color-divider);
  font-size: 13px; line-height: 1.3;
  color: color-mix(in srgb, var(--color-text) 60%, transparent);
}

/* — holding page — */
.holding { min-height: 100vh; display: flex; flex-direction: column; }
.holding .nav .wordmark { margin-right: auto; }
.holding .nav .tag { white-space: nowrap; }
.holding main {
  flex: 1; width: 100%; max-width: 1280px; margin: 0 auto;
  padding: clamp(56px, 10vh, 120px) var(--page-gutter) 64px;
  display: flex; flex-direction: column; justify-content: center;
}
.holding .eyebrow { margin-bottom: 22px; }
.holding h1 {
  font-size: clamp(40px, 6.4vw, 84px); line-height: 1.03; letter-spacing: -0.03em;
  margin: 0; max-width: 15ch;
}
.holding .lead { margin: 32px 0 0; }
.holding .actions { margin-top: 40px; }
.holding footer { border-top: 2px solid var(--color-divider); }
.holding footer .container {
  padding-block: 20px; display: flex; flex-wrap: wrap; justify-content: space-between;
  gap: 8px 24px; font-size: 14px; color: color-mix(in srgb, var(--color-text) 70%, transparent);
}

/* — live site: progress bar and nav — */
.progress {
  position: fixed; top: 0; left: 0; height: 3px; width: 0%;
  background: var(--color-accent); z-index: 100;
}
.site-nav {
  position: sticky; top: 0; z-index: 50;
  background: var(--color-bg);
  flex-wrap: wrap; row-gap: 12px; column-gap: clamp(12px, 2.4vw, 28px);
}
.site-nav .wordmark { margin-right: auto; text-decoration: none; }
.site-nav .wordmark:hover { color: var(--color-text); }
.site-nav .btn { flex: none; }

/* — hero — */
.hero {
  padding-top: 80px; padding-bottom: 64px;
  display: flex; flex-wrap: wrap; align-items: center; gap: 48px clamp(32px, 5vw, 72px);
}
.hero-text { flex: 1 1 520px; min-width: 0; }
.hero-text .eyebrow { margin-bottom: 22px; }
.hero h1 {
  font-size: clamp(38px, 5.4vw, 66px); line-height: 1.05; letter-spacing: -0.025em;
  margin: 0; max-width: 16ch;
}
.hero .lead { margin: 28px 0 0; }
.hero .actions { margin-top: 36px; }
.hero-media { flex: 1 1 380px; min-width: 0; }
.hero-media img, .hero-media .placeholder {
  width: 100%; aspect-ratio: 4 / 5; max-height: 560px; object-fit: cover;
}

/* — founding members — */
.members { border-top: 2px solid var(--color-divider); border-bottom: 2px solid var(--color-divider); }
.members .container {
  padding-block: 28px; display: flex; flex-wrap: wrap; align-items: center;
  gap: 20px clamp(24px, 4vw, 56px);
}
.members-label {
  flex: none; margin: 0; font-family: var(--font-heading); font-weight: 800; font-size: 12px;
  letter-spacing: 0.1em; text-transform: uppercase;
  color: color-mix(in srgb, var(--color-text) 60%, transparent);
}
.logo-grid {
  flex: 1 1 640px; display: grid; grid-template-columns: repeat(auto-fit, minmax(110px, 1fr));
  gap: 16px 24px; align-items: center;
}
.logo-grid img, .logo-grid .placeholder { width: 100%; height: 56px; object-fit: contain; }

/* — what does downstream mean — */
.downstream { padding-block: 80px; }
.stages {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  border: 2px solid var(--color-divider);
}
.stage {
  all: unset; box-sizing: border-box; cursor: pointer;
  display: flex; flex-direction: column; gap: 10px;
  padding: 28px 26px; min-height: 150px;
  background: var(--color-bg); color: var(--color-text);
  box-shadow: 0 0 0 1px var(--color-divider);
  transition: background 0.25s ease, color 0.25s ease;
}
.stage:focus-visible { outline: 2px solid var(--color-accent); outline-offset: 2px; position: relative; z-index: 1; }
.stage-meta {
  display: flex; justify-content: space-between; align-items: center;
  font-family: var(--font-heading); font-weight: 800; font-size: 12px;
  letter-spacing: 0.1em; text-transform: uppercase; color: var(--color-accent-700);
}
.stage-arrow { font-size: 22px; letter-spacing: 0; line-height: 1; height: 22px; min-width: 22px; text-align: right; }
.stage-title {
  font-family: var(--font-heading); font-weight: 800; font-size: clamp(24px, 2.4vw, 30px);
  line-height: 1.1; letter-spacing: -0.015em;
}
.stage[aria-pressed="true"] { background: var(--color-accent); color: var(--color-bg); }
.stage[aria-pressed="true"] .stage-meta { color: var(--color-bg); }

.stage-panel {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 340px), 1fr));
  gap: 32px clamp(24px, 4vw, 56px); padding-top: 36px;
}
.stage-panel[hidden] { display: none; }
.stage-copy { display: flex; flex-direction: column; gap: 24px; }
.stage-copy > p { font-size: 18px; line-height: 1.6; margin: 0; max-width: 52ch; }
.group-label {
  display: block; font-family: var(--font-heading); font-weight: 800; font-size: 12px;
  letter-spacing: 0.1em; text-transform: uppercase; color: var(--color-accent-700);
  padding-top: 14px; border-top: 2px solid var(--color-divider); margin-bottom: 14px;
}
.chips { display: flex; flex-wrap: wrap; gap: 8px; margin: 0; padding: 0; list-style: none; }
.chips .tag { font-size: 14px; }
.stage-images { display: grid; grid-template-columns: minmax(0, 1fr); gap: 12px; }
.stage-images .placeholder, .stage-images img { width: 100%; aspect-ratio: 16 / 10; object-fit: cover; }
.stage-images.is-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.stage-images.is-grid .placeholder, .stage-images.is-grid img { aspect-ratio: 4 / 3; }

/* — downstream economy — */
.economy { background: var(--color-accent); color: var(--color-bg); }
.economy .container { padding-block: 64px; }
.economy .section-head { gap: 12px 40px; margin-bottom: 40px; }
.economy .section-title, .economy .section-hint { color: var(--color-bg); }
.stats {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 28px 24px; margin: 0;
}
.stat { border-top: 2px solid var(--color-bg); padding-top: 16px; }
.stat dd {
  margin: 0 0 12px; font-family: var(--font-heading); font-weight: 800;
  font-size: clamp(40px, 4.4vw, 60px); line-height: 1; letter-spacing: -0.03em;
}
.stat dt { font-size: 15px; line-height: 1.4; }
.stat { display: flex; flex-direction: column-reverse; justify-content: flex-end; }

/* — principles — */
.principles { padding-block: 80px; }
.principles .section-title { margin: 0 0 18px; max-width: 22ch; }
.principles-intro {
  font-size: 18px; line-height: 1.6; margin: 0 0 48px; max-width: 62ch;
  color: color-mix(in srgb, var(--color-text) 85%, transparent);
}
.principle-list { list-style: none; margin: 0; padding: 0; }
.principle {
  display: grid; grid-template-columns: clamp(72px, 14vw, 180px) minmax(0, 1fr);
  gap: 16px clamp(20px, 4vw, 56px); align-items: start;
  padding: 32px 0; border-top: 2px solid var(--color-divider);
}
.principle:last-child { border-bottom: 2px solid var(--color-divider); }
.principle-num {
  font-family: var(--font-heading); font-weight: 800; font-size: clamp(56px, 7vw, 104px);
  line-height: 0.85; letter-spacing: -0.04em; color: var(--color-accent);
}
.principle-body { max-width: 68ch; }
.principle h3 { font-size: clamp(22px, 2.2vw, 28px); line-height: 1.2; margin: 0 0 12px; letter-spacing: -0.015em; }
.principle p { font-size: 17px; line-height: 1.6; margin: 0; color: color-mix(in srgb, var(--color-text) 82%, transparent); }

/* — positions — */
.positions-band {
  background: var(--color-surface);
  border-top: 2px solid var(--color-divider); border-bottom: 2px solid var(--color-divider);
}
.positions { padding-block: 80px; }
.positions .eyebrow { margin-bottom: 14px; }
.positions .section-title { margin: 0 0 40px; }
.cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(100%, 300px), 1fr)); gap: 16px; }
.position-card {
  display: flex; flex-direction: column; gap: 14px; min-height: 200px; padding: 26px 24px;
  background: var(--color-bg); border: 2px solid var(--color-divider);
  text-decoration: none; color: var(--color-text);
  transition: border-color 0.2s ease, background 0.2s ease, transform 0.2s ease;
}
.position-card:hover {
  border-color: var(--color-accent); background: var(--color-accent-100);
  transform: translateY(-3px); color: var(--color-text);
}
.card-kicker {
  font-family: var(--font-heading); font-weight: 800; font-size: 12px;
  letter-spacing: 0.1em; text-transform: uppercase; color: var(--color-accent-700);
}
.position-card h3 { font-size: 21px; line-height: 1.25; margin: 0; letter-spacing: -0.015em; }
.position-card p { font-size: 15px; line-height: 1.55; margin: 0; color: color-mix(in srgb, var(--color-text) 80%, transparent); }
.card-cta { margin-top: auto; font-family: var(--font-heading); font-weight: 800; font-size: 14px; color: var(--color-accent-700); }

/* — join — */
.join {
  padding-block: 96px; display: flex; flex-wrap: wrap; justify-content: space-between;
  align-items: flex-end; gap: 32px 56px;
}
.join-text { flex: 1 1 520px; }
.join h2 { font-size: clamp(40px, 5.6vw, 72px); line-height: 1; letter-spacing: -0.03em; margin: 0 0 24px; }
.join p { font-size: 19px; line-height: 1.6; margin: 0; max-width: 52ch; }
.join p a { font-weight: 700; color: var(--color-accent-700); }
.join .btn-large { font-size: 17px; padding: 16px 24px; min-width: 240px; justify-content: flex-start; }

/* — footer — */
.site-footer { border-top: 2px solid var(--color-divider); }
.site-footer .container {
  padding-block: 28px; display: flex; flex-wrap: wrap; justify-content: space-between;
  align-items: center; gap: 12px 32px; font-size: 13px;
  color: color-mix(in srgb, var(--color-text) 65%, transparent);
}
.site-footer .wordmark { font-size: 14px; }

/* — scroll reveal (only when JS is running and motion is allowed) — */
@media (prefers-reduced-motion: no-preference) {
  .js [data-reveal] {
    opacity: 0; transform: translateY(26px);
    transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1), transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
  }
  .js [data-reveal].is-visible { opacity: 1; transform: none; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .stage, .position-card { transition: none; }
}