/* ==========================================================================
   Substrate — 3D AI Infrastructure Template
   main.css
   1. Tokens
   2. Reset & base
   3. Typography
   4. Layout
   5. Components
   6. Sections
   7. Preview dock
   8. Responsive
   ========================================================================== */

/* 1. Tokens ------------------------------------------------------------- */

:root {
  /* Palette */
  --paper: #f4f5f7;
  --surface: #ffffff;
  --ink: #14161d;
  --slate: #676d7c;
  --sand: #c9bba6;
  --line: #dfe1e6;

  /* Accent (swapped by data-accent) */
  --accent: #1f3be0;
  --accent-soft: #e6e9fd;
  --accent-ink: #ffffff;

  /* 3D scene colours, read by scene.js */
  --scene-a: #1f3be0;
  --scene-b: #14161d;
  --scene-c: #c9bba6;

  /* Type scale — 1.25 minor third, fluid */
  --step--1: clamp(0.83rem, 0.8rem + 0.14vw, 0.9rem);
  --step-0: clamp(1rem, 0.96rem + 0.2vw, 1.12rem);
  --step-1: clamp(1.25rem, 1.17rem + 0.38vw, 1.5rem);
  --step-2: clamp(1.56rem, 1.42rem + 0.72vw, 2rem);
  --step-3: clamp(1.95rem, 1.7rem + 1.25vw, 2.75rem);
  --step-4: clamp(2.44rem, 2rem + 2.2vw, 4rem);
  --step-5: clamp(3rem, 2.2rem + 3.6vw, 5.5rem);

  /* Space */
  --sp-1: 0.5rem;
  --sp-2: 0.875rem;
  --sp-3: 1.5rem;
  --sp-4: 2.5rem;
  --sp-5: 4rem;
  --sp-6: 6.5rem;

  --wrap: 78rem;
  --gutter: clamp(1.25rem, 4vw, 3.5rem);
  --radius: 4px;
  --dur: 420ms;
  --ease: cubic-bezier(0.22, 0.68, 0.32, 1);
}

/* Accent themes */
[data-accent="graphite"] { --accent: #2f3540; --accent-soft: #e7e9ed; }
[data-accent="ember"]    { --accent: #c2410c; --accent-soft: #fbe8dd; }
[data-accent="moss"]     { --accent: #2f6b4f; --accent-soft: #e0eee7; }
[data-accent="graphite"] { --scene-a: #2f3540; }
[data-accent="ember"]    { --scene-a: #c2410c; }
[data-accent="moss"]     { --scene-a: #2f6b4f; }

/* Dark mode */
[data-theme="dark"] {
  --paper: #101218;
  --surface: #171a22;
  --ink: #eef0f4;
  --slate: #98a0b0;
  --line: #262a35;
  --sand: #7b6f5e;
  --accent-soft: #1b2140;
  --scene-b: #eef0f4;
}
[data-theme="dark"][data-accent="graphite"] { --accent: #9aa3b4; --accent-ink: #101218; --accent-soft: #232833; --scene-a: #9aa3b4; }
[data-theme="dark"][data-accent="ember"]    { --accent: #f2762f; --accent-ink: #101218; --accent-soft: #2c1a10; --scene-a: #f2762f; }
[data-theme="dark"][data-accent="moss"]     { --accent: #4fa87c; --accent-ink: #101218; --accent-soft: #14261e; --scene-a: #4fa87c; }
[data-theme="dark"] { --accent: #6b83ff; --accent-ink: #101218; --scene-a: #6b83ff; }

/* 2. Reset & base -------------------------------------------------------- */

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

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: "Public Sans", ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
  font-size: var(--step-0);
  line-height: 1.6;
  font-synthesis-weight: none;
  -webkit-font-smoothing: antialiased;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease);
}

img, canvas, svg { display: block; max-width: 100%; }
img { height: auto; }

a { color: inherit; }

button { font: inherit; color: inherit; }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 2px;
}

.skip-link {
  position: absolute;
  left: var(--gutter);
  top: -4rem;
  z-index: 100;
  background: var(--ink);
  color: var(--paper);
  padding: var(--sp-2) var(--sp-3);
  border-radius: var(--radius);
  transition: top 200ms var(--ease);
}
.skip-link:focus { top: var(--sp-2); }

.visually-hidden {
  position: absolute; width: 1px; height: 1px;
  clip-path: inset(50%); overflow: hidden; white-space: nowrap;
}

/* 3. Typography ---------------------------------------------------------- */

h1, h2, h3, h4 {
  font-family: "Bricolage Grotesque", ui-sans-serif, system-ui, sans-serif;
  font-weight: 600;
  line-height: 1.04;
  letter-spacing: -0.028em;
  margin: 0 0 var(--sp-3);
  text-wrap: balance;
}

h1 { font-size: var(--step-5); font-variation-settings: "wdth" 92; }
h2 { font-size: var(--step-4); }
h3 { font-size: var(--step-2); letter-spacing: -0.02em; }
h4 { font-size: var(--step-1); letter-spacing: -0.012em; }

p { margin: 0 0 var(--sp-3); max-width: 62ch; }

.lede { font-size: var(--step-1); color: var(--slate); line-height: 1.5; max-width: 40ch; }
.muted { color: var(--slate); }
.small { font-size: var(--step--1); }

.tag {
  display: inline-block;
  font-size: var(--step--1);
  color: var(--slate);
  border-bottom: 1px solid var(--sand);
  padding-bottom: 2px;
  margin-bottom: var(--sp-3);
}

/* 4. Layout -------------------------------------------------------------- */

.wrap {
  width: min(100% - var(--gutter) * 2, var(--wrap));
  margin-inline: auto;
}

.section { padding-block: var(--sp-6); }
.section--tight { padding-block: var(--sp-5); }
.section--line { border-top: 1px solid var(--line); }

.grid { display: grid; gap: var(--sp-4); }
.grid--2 { grid-template-columns: repeat(2, 1fr); }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--split { grid-template-columns: 5fr 7fr; align-items: start; gap: var(--sp-5); }

.stack > * + * { margin-top: var(--sp-3); }

/* 5. Components ---------------------------------------------------------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-1);
  padding: 0.78rem 1.4rem;
  border: 1px solid transparent;
  border-radius: var(--radius);
  background: var(--accent);
  color: var(--accent-ink);
  font-weight: 600;
  font-size: var(--step-0);
  text-decoration: none;
  cursor: pointer;
  transition: transform 160ms var(--ease), filter 160ms var(--ease);
}
.btn:hover { filter: brightness(1.1); transform: translateY(-1px); }
.btn:active { transform: translateY(0); }

.btn--ghost {
  background: transparent;
  color: var(--ink);
  border-color: var(--line);
}
.btn--ghost:hover { border-color: var(--ink); filter: none; }

.link {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid color-mix(in srgb, var(--accent) 35%, transparent);
  padding-bottom: 1px;
  transition: border-color 160ms var(--ease);
}
.link:hover { border-bottom-color: var(--accent); }

/* Site header */
.masthead {
  position: sticky;
  top: 0;
  z-index: 40;
  background: color-mix(in srgb, var(--paper) 86%, transparent);
  backdrop-filter: saturate(1.4) blur(12px);
  border-bottom: 1px solid var(--line);
}
.masthead__inner {
  display: flex;
  align-items: center;
  gap: var(--sp-4);
  min-height: 4.25rem;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-family: "Bricolage Grotesque", sans-serif;
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: -0.03em;
  text-decoration: none;
}
.brand__mark {
  width: 22px; height: 22px;
  border-radius: 3px;
  background: var(--accent);
  position: relative;
  overflow: hidden;
}
.brand__mark::after {
  content: "";
  position: absolute; inset: 5px 5px auto auto;
  width: 8px; height: 8px;
  background: var(--accent-ink);
  opacity: 0.9;
}

.nav { display: flex; gap: var(--sp-3); margin-left: auto; align-items: center; }
.nav a {
  text-decoration: none;
  font-size: var(--step--1);
  color: var(--slate);
  transition: color 160ms var(--ease);
}
.nav a:hover, .nav a[aria-current="page"] { color: var(--ink); }

.nav-toggle { display: none; background: none; border: 1px solid var(--line); border-radius: var(--radius); padding: 0.5rem 0.7rem; cursor: pointer; margin-left: auto; }

/* Feature list — not identical cards; a definition list with hairlines */
.deflist { border-top: 1px solid var(--line); }
.deflist__row {
  display: grid;
  grid-template-columns: 4fr 8fr;
  gap: var(--sp-4);
  padding-block: var(--sp-4);
  border-bottom: 1px solid var(--line);
}
.deflist__row h3 { margin: 0; }
.deflist__row p { margin: 0; color: var(--slate); }

/* Sequence — numbering is justified here, it is a real sequence */
.steps { counter-reset: step; display: grid; gap: var(--sp-4); }
.step { display: grid; grid-template-columns: 3rem 1fr; gap: var(--sp-3); align-items: start; }
.step::before {
  counter-increment: step;
  content: counter(step, decimal-leading-zero);
  font-family: "Bricolage Grotesque", sans-serif;
  font-size: var(--step-2);
  color: var(--sand);
  line-height: 1;
}
.step h4 { margin-bottom: 0.3rem; }
.step p { margin: 0; color: var(--slate); }

/* Metrics */
.metrics { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--sp-4); }
.metric__value {
  font-family: "Bricolage Grotesque", sans-serif;
  font-size: var(--step-3);
  line-height: 1;
  letter-spacing: -0.03em;
}
.metric__label { color: var(--slate); font-size: var(--step--1); margin-top: var(--sp-1); }

/* Pricing */
.plan {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: var(--sp-4);
  display: flex;
  flex-direction: column;
}
.plan--featured { border-color: var(--accent); box-shadow: 0 0 0 1px var(--accent); }
.plan__price { font-family: "Bricolage Grotesque", sans-serif; font-size: var(--step-3); line-height: 1; margin: var(--sp-2) 0 var(--sp-1); }
.plan ul { list-style: none; padding: 0; margin: var(--sp-3) 0; display: grid; gap: 0.55rem; font-size: var(--step--1); color: var(--slate); }
.plan li { display: grid; grid-template-columns: 1.1rem 1fr; gap: 0.5rem; }
.plan li::before { content: ""; width: 7px; height: 7px; margin-top: 0.5rem; background: var(--accent); border-radius: 50%; }
.plan .btn { margin-top: auto; }

/* Quote */
.quote { border-left: 2px solid var(--accent); padding-left: var(--sp-3); }
.quote blockquote { margin: 0 0 var(--sp-2); font-size: var(--step-1); line-height: 1.45; }
.quote figcaption { color: var(--slate); font-size: var(--step--1); }

/* Logos */
.logos { display: flex; flex-wrap: wrap; gap: var(--sp-4); align-items: center; opacity: 0.65; }
.logos span { font-family: "Bricolage Grotesque", sans-serif; font-weight: 700; font-size: 1.05rem; letter-spacing: -0.02em; }

/* Forms */
.field { display: grid; gap: 0.4rem; margin-bottom: var(--sp-3); }
.field label { font-size: var(--step--1); color: var(--slate); }
.field input, .field textarea, .field select {
  font: inherit;
  padding: 0.7rem 0.85rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--ink);
}
.field input:focus, .field textarea:focus { border-color: var(--accent); outline: none; box-shadow: 0 0 0 3px var(--accent-soft); }
.form-note { font-size: var(--step--1); color: var(--slate); }

/* Footer */
.footer { border-top: 1px solid var(--line); padding-block: var(--sp-5) var(--sp-4); }
.footer__grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: var(--sp-4); }
.footer h4 { font-size: var(--step--1); color: var(--slate); font-family: inherit; font-weight: 600; margin-bottom: var(--sp-2); }
.footer ul { list-style: none; padding: 0; margin: 0; display: grid; gap: 0.5rem; }
.footer a { text-decoration: none; font-size: var(--step--1); color: var(--slate); }
.footer a:hover { color: var(--ink); }
.footer__base { margin-top: var(--sp-4); padding-top: var(--sp-3); border-top: 1px solid var(--line); display: flex; justify-content: space-between; gap: var(--sp-3); flex-wrap: wrap; font-size: var(--step--1); color: var(--slate); }

/* 6. Sections ------------------------------------------------------------ */

.hero { position: relative; padding-block: var(--sp-6) var(--sp-5); overflow: clip; }
.hero__inner { display: grid; grid-template-columns: 5fr 7fr; gap: var(--sp-5); align-items: center; min-height: 60vh; }
.hero__copy { position: relative; z-index: 2; }
.hero h1 { margin-bottom: var(--sp-3); }
.hero__actions { display: flex; gap: var(--sp-2); flex-wrap: wrap; margin-top: var(--sp-4); }
.hero__meta { margin-top: var(--sp-4); font-size: var(--step--1); color: var(--slate); }

.stage {
  position: relative;
  aspect-ratio: 1 / 1;
  width: 100%;
  max-height: 68vh;
  margin-right: calc(var(--gutter) * -1);
}
.stage canvas { width: 100%; height: 100%; }
.stage__fallback {
  position: absolute; inset: 0;
  display: none;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--slate);
  font-size: var(--step--1);
  text-align: center;
  padding: var(--sp-4);
}
.stage[data-fallback="true"] .stage__fallback { display: grid; }
.stage[data-fallback="true"] canvas { display: none; }

.stage__hint {
  position: absolute;
  left: 0; bottom: 0;
  font-size: var(--step--1);
  color: var(--slate);
  background: color-mix(in srgb, var(--paper) 80%, transparent);
  padding: 0.3rem 0.6rem;
  border-radius: var(--radius);
  pointer-events: none;
  transition: opacity 300ms var(--ease);
}
.stage.is-engaged .stage__hint { opacity: 0; }

.band { background: var(--surface); border-block: 1px solid var(--line); }

.page-head { padding-block: var(--sp-5) var(--sp-4); border-bottom: 1px solid var(--line); }

/* Page-load sequence — one orchestrated moment only */
.reveal { opacity: 0; transform: translateY(14px); }
.is-ready .reveal {
  opacity: 1;
  transform: none;
  transition: opacity 700ms var(--ease), transform 700ms var(--ease);
}
.is-ready .reveal:nth-child(2) { transition-delay: 90ms; }
.is-ready .reveal:nth-child(3) { transition-delay: 180ms; }
.is-ready .reveal:nth-child(4) { transition-delay: 270ms; }

/* 7. Preview dock -------------------------------------------------------- */

.dock {
  position: fixed;
  right: 1rem; bottom: 1rem;
  z-index: 60;
  font-size: var(--step--1);
}
.dock__panel {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: 0 12px 34px rgba(10, 12, 20, 0.14);
  padding: var(--sp-3);
  width: 15.5rem;
  display: none;
}
.dock.is-open .dock__panel { display: block; }
.dock__group + .dock__group { margin-top: var(--sp-3); }
.dock__group > span { display: block; color: var(--slate); margin-bottom: 0.45rem; }
.dock__opts { display: flex; flex-wrap: wrap; gap: 0.35rem; }
.dock__opts button {
  border: 1px solid var(--line);
  background: transparent;
  border-radius: 999px;
  padding: 0.3rem 0.7rem;
  cursor: pointer;
  transition: border-color 160ms var(--ease), background 160ms var(--ease);
}
.dock__opts button[aria-pressed="true"] { border-color: var(--accent); background: var(--accent-soft); color: var(--ink); }
.dock__swatch { width: 1.6rem; height: 1.6rem; border-radius: 50%; padding: 0; border: 2px solid var(--line); }
.dock__swatch[aria-pressed="true"] { border-color: var(--ink); }
.dock__trigger {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 0.45rem;
  background: var(--ink);
  color: var(--paper);
  border: none;
  border-radius: 999px;
  padding: 0.6rem 1rem;
  cursor: pointer;
  box-shadow: 0 8px 24px rgba(10, 12, 20, 0.2);
}
.dock__bar { display: flex; margin-top: var(--sp-2); }

/* 8. Responsive ---------------------------------------------------------- */

@media (max-width: 1024px) {
  .hero__inner { grid-template-columns: 1fr; gap: var(--sp-4); }
  .stage { margin-right: 0; max-height: 52vh; order: -1; }
  .grid--split { grid-template-columns: 1fr; }
  .footer__grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 760px) {
  :root { --sp-6: 4rem; --sp-5: 3rem; }
  .nav {
    display: none;
    position: absolute;
    top: 100%; left: 0; right: 0;
    background: var(--surface);
    border-bottom: 1px solid var(--line);
    flex-direction: column;
    align-items: flex-start;
    gap: var(--sp-2);
    padding: var(--sp-3) var(--gutter);
  }
  .masthead.is-open .nav { display: flex; }
  .nav a { font-size: var(--step-0); }
  .nav-toggle { display: block; }
  .grid--2, .grid--3, .metrics { grid-template-columns: 1fr; }
  .deflist__row { grid-template-columns: 1fr; gap: var(--sp-2); }
  .footer__grid { grid-template-columns: 1fr; }
  .dock { right: 0.75rem; bottom: 0.75rem; }
  .dock__panel { width: min(17rem, calc(100vw - 1.5rem)); }
}

/* Reduced motion — respected everywhere */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
  .reveal { opacity: 1; transform: none; }
}

@media print {
  .dock, .masthead, .stage { display: none; }
}