/* Ultri Robotics — site styles
   Layout: an editorial page in the manner of anthropic.com. One 1200px column on a paper ground,
   left-aligned type, wide vertical rhythm, very little copy. The two scroll-driven figures are
   the loud elements; type, color and chrome stay quiet so they can carry the page. */

:root {
  /* color */
  --paper: #F4F2EB;      /* page ground */
  --paper-2: #EAE7DC;    /* bands */
  --ink: #1B1A16;        /* text, primary buttons */
  --ink-2: #55524A;      /* secondary text */
  --ink-3: #8B877C;      /* captions */
  --line: #D6D2C5;       /* hairlines */
  --copper: #B8652E;     /* accent: the cam of the wave generator, the furnace */
  --copper-2: #8F4A1E;   /* accent for text and hover */
  --copper-3: #EBCDB4;   /* accent tint */
  --night: #15140F;      /* dark section ground */
  --night-line: #35342B;
  --night-text: #EFEBDF;
  --night-muted: #A8A496;

  /* type */
  --font-display: "Newsreader", "Iowan Old Style", "Palatino Linotype", Georgia, serif;
  --font-body: "Archivo", "Helvetica Neue", Helvetica, Arial, sans-serif;
  --text-xs: 0.8125rem;
  --text-sm: 0.9375rem;
  --text-md: 1.0625rem;
  --text-lg: 1.25rem;
  --text-xl: 1.625rem;
  --h2: clamp(2rem, 3.2vw + 0.6rem, 3.25rem);
  --h1: clamp(2.75rem, 6vw + 1rem, 6.25rem);

  /* layout */
  --col: 1200px;
  --gutter-l: max(24px, env(safe-area-inset-left, 0px));
  --gutter-r: max(24px, env(safe-area-inset-right, 0px));
  --section: clamp(4.5rem, 9vw, 8.5rem);
  --radius-sm: 8px;
  --nav-h: 68px;
  --ease: cubic-bezier(0.2, 0.7, 0.2, 1);
}

/* ---------- base ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 0; -webkit-text-size-adjust: 100%; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: var(--text-md);
  line-height: 1.6;
  font-feature-settings: "kern", "liga";
  overflow-x: clip;
}
img, svg, canvas { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
p { margin: 0; }
h1, h2, h3 { margin: 0; font-weight: 400; text-wrap: balance; }
button { font: inherit; color: inherit; }
::selection { background: var(--copper-3); color: var(--ink); }
:focus-visible { outline: 2px solid var(--copper); outline-offset: 3px; border-radius: 2px; }

.wrap {
  width: 100%;
  max-width: calc(var(--col) + var(--gutter-l) + var(--gutter-r));
  margin-inline: auto;
  padding-left: var(--gutter-l);
  padding-right: var(--gutter-r);
}
.section { padding-block: var(--section); }

/* type roles */
.display { font-family: var(--font-display); font-weight: 400; letter-spacing: -0.022em; line-height: 1.02; font-variation-settings: "opsz" 72; }
.h1 { font-size: var(--h1); }
.h2 { font-size: var(--h2); line-height: 1.06; letter-spacing: -0.018em; }
.lead { font-size: var(--text-lg); line-height: 1.5; color: var(--ink-2); max-width: 34em; text-wrap: pretty; }

/* buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  min-height: 46px; padding: 0 1.25rem;
  border-radius: var(--radius-sm); border: 1px solid transparent;
  font-size: var(--text-sm); font-weight: 500; font-stretch: 106%;
  cursor: pointer; transition: background-color .2s var(--ease), color .2s var(--ease), border-color .2s var(--ease);
  white-space: nowrap;
}
.btn--primary { background: var(--ink); color: var(--paper); border-color: var(--ink); }
.btn--primary:hover { background: var(--copper-2); border-color: var(--copper-2); }

/* ---------- navigation ---------- */
.site-nav {
  position: fixed; inset: env(safe-area-inset-top, 0px) 0 auto 0; z-index: 50;
  height: var(--nav-h);
  background: transparent;
  border-bottom: 1px solid transparent;
  transition: background-color .3s var(--ease), border-color .3s var(--ease), color .3s var(--ease);
}
body::before { content: ""; position: fixed; inset: 0 0 auto; height: env(safe-area-inset-top, 0px); z-index: 60; background: var(--paper); }
.site-nav.is-solid { background: color-mix(in srgb, var(--paper) 88%, transparent); backdrop-filter: saturate(140%) blur(10px); -webkit-backdrop-filter: saturate(140%) blur(10px); border-bottom-color: var(--line); }
.site-nav .wrap { height: 100%; display: flex; align-items: center; gap: 2rem; }
.brand { display: inline-flex; align-items: center; gap: 0.6rem; font-weight: 600; font-stretch: 110%; font-size: 1.0625rem; letter-spacing: -0.01em; }
.brand svg { width: 26px; height: 26px; }
.nav-links { display: flex; gap: 1.75rem; margin-left: auto; align-items: center; }
.nav-links a { font-size: var(--text-sm); font-weight: 500; color: var(--ink-2); transition: color .2s; }
.nav-links a:hover { color: var(--ink); }
.nav-cta { margin-left: 0.75rem; }
.nav-links a.nav-cta { color: var(--ink); background: transparent; border-color: var(--ink); }
.nav-links a.nav-cta:hover { color: var(--paper); background: var(--ink); }
.nav-toggle { display: none; margin-left: auto; width: 44px; height: 44px; border: 0; background: transparent; border-radius: var(--radius-sm); cursor: pointer; }
.nav-toggle span { display: block; width: 22px; height: 2px; margin: 5px auto; background: currentColor; transition: transform .3s var(--ease), opacity .2s; }
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* over the dark section the bar goes dark too */
.site-nav.is-night { background: color-mix(in srgb, var(--night) 86%, transparent); border-bottom-color: var(--night-line); color: var(--night-text); }
.site-nav.is-night .nav-links a { color: var(--night-muted); }
.site-nav.is-night .nav-links a:hover { color: var(--night-text); }
.site-nav.is-night .nav-links a.nav-cta { color: var(--night-text); background: transparent; border-color: var(--night-text); }
.site-nav.is-night .nav-links a.nav-cta:hover { color: var(--night); background: var(--night-text); }

@media (max-width: 880px) {
  .nav-toggle { display: block; }
  .nav-links {
    position: fixed; left: 0; right: 0; top: calc(var(--nav-h) + env(safe-area-inset-top, 0px));
    flex-direction: column; align-items: stretch; gap: 0;
    padding: 0.5rem var(--gutter-r) 1.25rem var(--gutter-l);
    background: var(--paper); border-bottom: 1px solid var(--line);
    transform: translateY(-8px); opacity: 0; pointer-events: none;
    transition: transform .25s var(--ease), opacity .2s;
  }
  .nav-links.is-open { transform: none; opacity: 1; pointer-events: auto; }
  .nav-links a { padding: 0.9rem 0; border-bottom: 1px solid var(--line); font-size: var(--text-md); }
  .nav-links a:last-of-type { border-bottom: 0; }
  .nav-links .nav-cta { margin: 0.75rem 0 0; }
  .site-nav, .site-nav.is-solid, .site-nav.is-open { backdrop-filter: none; -webkit-backdrop-filter: none; }
  .site-nav.is-solid, .site-nav.is-open { background: var(--paper); border-bottom-color: var(--line); }
  .site-nav.is-night { background: var(--night); }
  .site-nav.is-night .nav-links { background: var(--night); border-bottom-color: var(--night-line); }
  .site-nav.is-night .nav-links a { border-bottom-color: var(--night-line); }
}

/* ---------- hero ---------- */
.hero { padding-top: calc(var(--nav-h) + clamp(4rem, 10vw, 9rem)); padding-bottom: clamp(3rem, 6vw, 5.5rem); }
.hero .wrap { display: flex; flex-direction: column; align-items: flex-start; gap: 1.75rem; }
.hero .h1 { max-width: 10.5em; }
.hero__sub { margin-top: -0.75rem; font-size: var(--text-sm); font-weight: 500; font-stretch: 106%; color: var(--ink-2); }
.hero__actions { display: flex; flex-wrap: wrap; gap: 0.75rem; padding-top: 0.5rem; }

/* ---------- scroll-driven figures ---------- */
.scrolly { position: relative; }
.scrolly__head { padding-top: var(--section); padding-bottom: 0.5rem; }
.scrolly__head .h2 { max-width: 14em; }
.scrolly__figure {
  position: sticky; top: 0;
  height: 100vh; height: 100svh;
  display: grid; place-items: center;
  padding-left: var(--gutter-l); padding-right: var(--gutter-r);
  min-width: 0;
}
.scrolly__figure svg { width: 100%; max-width: 1040px; height: auto; max-height: 100%; overflow: hidden; }
.scrolly__steps { padding-block: 10vh 30vh; }
.step { min-height: 60vh; }

/* the dark panel: an inset, rounded card while it approaches, full bleed once it pins */
.scrolly--night { color: var(--night-text); --panel-inset: clamp(16px, 7vw, 120px); }
.scrolly--night .scrolly__figure {
  --grow: 1;
  background: var(--night);
  clip-path: inset(0 calc((1 - var(--grow)) * var(--panel-inset)) 0 calc((1 - var(--grow)) * var(--panel-inset)) round calc((1 - var(--grow)) * 32px));
}

/* split variant: sticky scene left, big station names scrolling right */
.scrolly__grid { display: grid; grid-template-columns: minmax(0, 7fr) minmax(0, 5fr); gap: clamp(2rem, 4vw, 4rem); }
.scrolly--split .scrolly__figure { padding: 0; }
.scrolly--split .scrolly__figure svg { max-width: 640px; }
.scrolly--split .scrolly__steps { padding-block: 20vh 30vh; display: flex; flex-direction: column; }
.scrolly--split .step { min-height: 62vh; display: flex; flex-direction: column; justify-content: center; align-items: flex-start; gap: 0.9rem; opacity: 0.22; transition: opacity .45s var(--ease); }
.scrolly--split .step.is-active { opacity: 1; }
.station { font-size: clamp(2.5rem, 4.6vw, 4.75rem); line-height: 1; letter-spacing: -0.02em; }
.station__note { color: var(--ink-2); font-size: var(--text-sm); max-width: 24em; text-wrap: pretty; }
@media (max-width: 880px) {
  .scrolly__grid { grid-template-columns: 1fr; gap: 0; }
  .scrolly--split .scrolly__figure { height: 42vh; height: 42svh; top: calc(var(--nav-h) + env(safe-area-inset-top, 0px)); z-index: 2; background: var(--paper); }
  .scrolly--split .scrolly__steps { padding-block: 6vh 20vh; }
  .scrolly--split .step { min-height: 40vh; }
}

/* labels drawn inside the figures */
.callout { transition: opacity .35s var(--ease); }
.callout-line { stroke: var(--copper); stroke-width: 1.5; }
.callout-text { font-family: var(--font-body); font-size: 15px; font-weight: 500; fill: var(--night-text); text-anchor: middle; }
@media (max-width: 880px) { .callout-text { font-size: 26px; } }

/* ---------- specs ---------- */
.specs__title { max-width: 15em; margin-bottom: clamp(2.5rem, 5vw, 4rem); }
.specs__list { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 2rem 2.5rem; margin: 0; }
.specs__list dt { font-size: var(--text-xs); font-weight: 500; font-stretch: 106%; letter-spacing: 0.08em; text-transform: uppercase; color: var(--ink-3); margin-bottom: 0.55rem; }
.specs__list dd { margin: 0; font-family: var(--font-display); font-size: var(--text-xl); letter-spacing: -0.012em; line-height: 1.2; text-wrap: pretty; }
@media (max-width: 880px) { .specs__list { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (max-width: 480px) { .specs__list { grid-template-columns: 1fr; gap: 1.5rem; } }

/* ---------- mission ---------- */
.mission { background: var(--paper-2); }
.mission .wrap { display: grid; grid-template-columns: minmax(0, 6fr) minmax(0, 6fr); gap: clamp(2rem, 5vw, 5rem); align-items: center; }
.mission__copy { display: flex; flex-direction: column; gap: 1.5rem; }
.mission__title { font-size: clamp(1.75rem, 2.3vw + 0.6rem, 2.6rem); line-height: 1.1; letter-spacing: -0.016em; }
.quote { margin: 0.75rem 0 0; padding-top: 1.5rem; border-top: 1px solid var(--line); display: flex; flex-direction: column; gap: 0.75rem; }
.quote p { font-family: var(--font-display); font-style: italic; font-size: var(--text-lg); line-height: 1.4; font-variation-settings: "opsz" 24; color: var(--ink); max-width: 30em; text-wrap: pretty; }
.quote cite { font-style: normal; font-size: var(--text-sm); color: var(--ink-3); }
.mission__art { margin: 0; min-width: 0; }
.mission__art canvas { width: 100%; height: auto; }
@media (max-width: 880px) { .mission .wrap { grid-template-columns: 1fr; } }

/* ---------- footer ---------- */
.footer { border-top: 1px solid var(--line); padding-block: 2rem; font-size: var(--text-sm); }
.footer .wrap { display: flex; flex-wrap: wrap; align-items: center; gap: 1rem 2.5rem; }
.footer__links { display: flex; flex-wrap: wrap; gap: 1.5rem; }
.footer__links a { color: var(--ink-2); transition: color .2s; }
.footer__links a:hover { color: var(--ink); }
.footer__copy { margin-left: auto; color: var(--ink-3); font-size: var(--text-xs); }
@media (max-width: 560px) { .footer__copy { margin-left: 0; } }

/* ---------- motion ---------- */
svg .part { transition: opacity .45s var(--ease); }
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition-duration: 0.01ms !important; animation-duration: 0.01ms !important; }
}