/* === Progrista design tokens (light) === */
:root {
  --bg: #ffffff;
  --fg: #171717;
  --card: #fafafa;
  --card-fg: #171717;
  --muted: #f5f5f5;
  --muted-fg: #737373;
  --border: #e5e5e5;
  --primary: #0a0a0a;
  --primary-fg: #fafafa;

  --blaze: #ea580c;
  --spark: #7cb518;
  --nebula: #0d9488;
  --frost: #3b82f6;
  --phantom: #6d28d9;
  --bloom: #ec4899;
  --warning: #ca8a04;

  --display: 'Space Grotesk', system-ui, -apple-system, sans-serif;
  --mono: 'JetBrains Mono', ui-monospace, monospace;

  --radius: 10px;
  --radius-lg: 12px;

  --accent: var(--blaze);
  --selection-bg: color-mix(in srgb, var(--accent) 22%, transparent);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0a0a0a;
    --fg: #ededed;
    --card: #141414;
    --card-fg: #ededed;
    --muted: #1c1c1c;
    --muted-fg: #a3a3a3;
    --border: #262626;
    --primary: #fafafa;
    --primary-fg: #0a0a0a;

    --blaze: #f97316;
    --spark: #a3d145;
    --nebula: #14b8a6;
    --frost: #60a5fa;
    --phantom: #7c3aed;
    --bloom: #f472b6;
    --warning: #eab308;
  }
}

:root[data-theme="dark"] {
  --bg: #0a0a0a;
  --fg: #ededed;
  --card: #141414;
  --card-fg: #ededed;
  --muted: #1c1c1c;
  --muted-fg: #a3a3a3;
  --border: #262626;
  --primary: #fafafa;
  --primary-fg: #0a0a0a;
  --blaze: #f97316;
  --spark: #a3d145;
  --nebula: #14b8a6;
  --frost: #60a5fa;
  --phantom: #7c3aed;
  --bloom: #f472b6;
  --warning: #eab308;
}

*, *::before, *::after { box-sizing: border-box; }

html, body { min-height: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--display);
  font-size: 15px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background .2s ease, color .2s ease;
  display: flex;
  flex-direction: column;
}

em, i, .italic { font-style: normal; }
::selection { background: var(--selection-bg); color: var(--fg); }

.container {
  max-width: 1180px;
  width: 100%;
  margin: 0 auto;
  padding: 0 clamp(20px, 4vw, 56px) clamp(80px, 12vw, 140px);
  flex: 1 0 auto;
  display: flex;
  flex-direction: column;
}

/* === Topbar === */
.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  background: color-mix(in srgb, var(--bg) 92%, transparent);
  backdrop-filter: saturate(180%) blur(10px);
  -webkit-backdrop-filter: saturate(180%) blur(10px);
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 18px 0;
  border-bottom: 1px solid var(--border);
  font-family: var(--display);
  font-size: 13px;
  font-weight: 500;
}
.brand {
  font-family: var(--display);
  font-weight: 700;
  font-size: 16px;
  letter-spacing: -0.02em;
  color: var(--fg);
  text-decoration: none;
}
.brand .dot { color: var(--accent); }
.topbar nav {
  display: flex;
  gap: 4px;
  align-items: center;
}

/* === Nav links === */
.nav-link {
  display: inline-flex;
  align-items: center;
  height: 34px;
  padding: 0 12px;
  border-radius: 999px;
  color: var(--muted-fg);
  text-decoration: none;
  font-family: var(--display);
  font-size: 13px;
  font-weight: 500;
  transition: color .15s ease, background .15s ease;
}
.nav-link:hover { color: var(--fg); }
.nav-link[aria-current="page"] { color: var(--accent); }

.topbar nav button.nav-theme {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  justify-content: center;
  width: 34px;
  height: 34px;
  padding: 0;
  border: 0;
  background: transparent;
  color: var(--muted-fg);
  border-radius: 999px;
  cursor: pointer;
  font: inherit;
  transition: background .15s ease;
  margin-left: 4px;
}
.nav-theme .nav-label { display: none; }
.nav-theme .nav-num {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 1em;
  height: 1em;
  line-height: 1;
  font-size: 20px;
  transform-origin: center;
  transition: transform .4s cubic-bezier(.2,.7,.2,1), color .2s ease;
}
:root:not([data-theme]) .nav-theme .nav-num { color: var(--nebula) !important; }
:root[data-theme="light"] .nav-theme .nav-num { color: var(--blaze) !important; }
:root[data-theme="dark"] .nav-theme .nav-num { color: var(--phantom) !important; }
.nav-theme:hover .nav-num { transform: scale(1.15); }
.nav-theme .nav-num svg { display: block; width: 17px; height: 17px; }

/* === Section scaffolding === */
main { display: flex; flex-direction: column; flex: 1; }
.section {
  display: grid;
  grid-template-columns: 1fr 3fr;
  gap: clamp(24px, 5vw, 80px);
  padding: clamp(56px, 9vw, 100px) 0;
  scroll-margin-top: 80px;
}

.section-meta {
  font-family: var(--display);
  font-size: 13px;
  color: var(--muted-fg);
  line-height: 1.55;
  align-self: start;
  position: sticky;
  top: 80px;
}
.section-label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--muted-fg);
  margin-bottom: 20px;
  padding: 4px 10px;
  border: 1px solid color-mix(in srgb, var(--accent) 45%, transparent);
  border-radius: 999px;
}

.section-meta dl { margin: 0; }
.section-meta dt {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  color: var(--muted-fg);
  margin-top: 14px;
  font-weight: 500;
}
.section-meta dt:first-of-type { margin-top: 0; }
.section-meta dd {
  margin: 4px 0 0;
  color: var(--fg);
  font-size: 13px;
  font-weight: 500;
}

/* === Hero === */
.hero {
  padding-top: clamp(40px, 8vw, 80px);
  align-items: end;
  position: relative;
  flex: 1;
}
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(38% 50% at 32% 42%, color-mix(in srgb, var(--blaze) 32%, transparent), transparent 70%),
    radial-gradient(40% 52% at 56% 60%, color-mix(in srgb, var(--warning) 26%, transparent), transparent 72%),
    radial-gradient(38% 50% at 70% 40%, color-mix(in srgb, var(--phantom) 26%, transparent), transparent 72%);
  pointer-events: none;
  z-index: 0;
  filter: blur(64px) saturate(0.78);
  animation: glow 1.4s cubic-bezier(.2,.7,.2,1) .1s forwards;
  opacity: 0;
}
.hero > div { position: relative; z-index: 1; }
.hero h1 {
  font-family: var(--display);
  font-weight: 700;
  font-size: clamp(48px, 9vw, 112px);
  line-height: 0.95;
  letter-spacing: -0.04em;
  margin: 0 0 28px;
  color: var(--fg);
}
.hero h1 .italic {
  color: var(--blaze);
  font-weight: 700;
}
.hero .lede {
  font-family: var(--display);
  font-weight: 400;
  font-size: clamp(16px, 1.6vw, 19px);
  line-height: 1.5;
  letter-spacing: -0.005em;
  max-width: 52ch;
  color: var(--muted-fg);
  margin: 0;
}
.hero .lede em { color: var(--fg); font-weight: 500; }
.hero .lede .accent { font-weight: 600; color: var(--accent); }
.hero .lede + .lede { margin-top: clamp(16px, 2vw, 24px); }

/* === Approach / process === */
.process { list-style: none; padding: 0; margin: 0; display: grid; gap: 12px; }
.process li {
  display: grid;
  grid-template-columns: auto 1fr;
  column-gap: clamp(16px, 2.4vw, 24px);
  align-items: start;
  padding: 18px 20px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
}
.step-num {
  font-family: var(--mono);
  font-weight: 700;
  font-size: clamp(20px, 2.2vw, 26px);
  color: var(--accent);
  line-height: 1;
  letter-spacing: -0.02em;
  min-width: 2ch;
}
.step-title {
  font-family: var(--display);
  font-weight: 600;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.3;
  letter-spacing: -0.01em;
  margin: 0 0 6px;
  color: var(--fg);
  display: flex;
  align-items: center;
}
.process p {
  margin: 0;
  color: var(--muted-fg);
  font-size: 13.5px;
  line-height: 1.55;
  max-width: 64ch;
}
.process li {
  contain: layout;
  transition: transform .25s cubic-bezier(.2,.7,.2,1),
              border-color .25s ease,
              box-shadow .25s ease;
}
.process li:hover {
  transform: translateY(-3px);
  border-color: color-mix(in srgb, var(--accent) 45%, var(--border));
  box-shadow: 0 10px 30px -14px color-mix(in srgb, var(--accent) 35%, transparent);
}
.process li:hover .step-title { color: var(--accent); transition: color .2s ease; }
/* Current build phase */
.process li.current {
  border-color: color-mix(in srgb, var(--accent) 55%, var(--border));
  background:
    linear-gradient(color-mix(in srgb, var(--accent) 7%, transparent),
                    color-mix(in srgb, var(--accent) 7%, transparent)),
    var(--card);
}
.process li.current .step-num { position: relative; }
.process li.current .step-title { color: var(--accent); }
.step-title .live {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
  margin-right: 8px;
  flex-shrink: 0;
  animation: pulse 1.8s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(0.7); }
}
@media (prefers-reduced-motion: reduce) {
  .step-title .live { animation: none; }
}

/* === Persistent footer bar === */
.footbar {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 15;
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 clamp(20px, 4vw, 56px);
}
.colophon {
  background: color-mix(in srgb, var(--bg) 92%, transparent);
  backdrop-filter: saturate(180%) blur(10px);
  -webkit-backdrop-filter: saturate(180%) blur(10px);
  border-top: 1px solid var(--border);
  padding: 12px 0;
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  align-items: center;
  gap: 16px;
  font-family: var(--display);
  font-size: 12px;
  color: var(--muted-fg);
}
.colophon a {
  color: var(--fg);
  text-decoration: none;
  font-weight: 500;
  background-image: linear-gradient(var(--accent), var(--accent));
  background-size: 0 1.5px;
  background-position: 0 100%;
  background-repeat: no-repeat;
  transition: background-size .3s cubic-bezier(.2,.7,.2,1), color .2s ease;
}
.colophon a:hover { background-size: 100% 1.5px; color: var(--accent); }
.colophon .label {
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  color: var(--muted-fg);
  margin-bottom: 3px;
  font-weight: 500;
}
.colophon .right { text-align: right; }
.colophon .links { display: flex; flex-wrap: wrap; align-items: baseline; gap: 0 8px; }
.colophon .links .sep { opacity: 0.4; }

/* === Reveal animation === */
@keyframes rise {
  from { opacity: 0; transform: translateY(14px); filter: blur(4px); }
  to { opacity: 1; transform: translateY(0); filter: blur(0); }
}
@keyframes glow {
  from { opacity: 0; transform: scale(0.96); }
  to { opacity: 1; transform: scale(1); }
}
.reveal { opacity: 0; animation: rise .9s cubic-bezier(.2,.7,.2,1) forwards; }
.d1 { animation-delay: .04s; }
.d2 { animation-delay: .14s; }
.d3 { animation-delay: .26s; }
.d4 { animation-delay: .38s; }

/* === Mobile === */
@media (max-width: 760px) {
  .section { grid-template-columns: 1fr; gap: 20px; padding: 56px 0; }
  .section-meta { position: static; padding-bottom: 8px; }
  .section-meta dl {
    display: grid;
    grid-template-columns: auto 1fr;
    column-gap: 16px;
    row-gap: 6px;
    align-items: baseline;
  }
  .section-meta dt { margin-top: 0; }
  .section-meta dd { margin: 0; }
  .colophon { gap: 12px; }
  #index .lede,
  #process p { text-align: justify; hyphens: auto; }
}

@media (max-width: 480px) {
  .topbar { padding: 14px 0; }
  .nav-link { padding: 0 9px; }
  .colophon { grid-template-columns: 1fr 1fr; gap: 8px 16px; padding: 10px 0; }
  .colophon .right { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; animation: none; }
  .hero::before { animation: none; opacity: 1; }
}