/* ============================================================
   BLYDAR — design system
   Monochrome, technical, quiet. Color belongs to intelligence.
   Typeface: Tomorrow (Google Fonts) — mandatory brand rule.
   ============================================================ */

:root {
  /* LIGHT theme (default) — warm paper, graphite ink */
  --bg: #f4f3ef;
  --surface: #fbfaf7;
  --surface-2: #eceae4;

  /* Hairlines */
  --line: rgba(24, 24, 20, 0.12);
  --line-strong: rgba(24, 24, 20, 0.3);

  /* Text */
  --text: #151512;
  --text-2: #55554f;
  --text-3: #83837c;

  /* Inverted-surface text (background: var(--text)) */
  --on-invert: #f7f6f2;
  /* Header glass */
  --header-glass: rgba(244, 243, 239, 0.85);
  /* Canvas signal dot color, as "r,g,b" */
  --signal-rgb: 21, 21, 18;

  /* Semantic color — data meaning only, never decoration */
  --sev-critical: #d63a2c;
  --sev-high: #c9661a;
  --sev-medium: #a8871f;
  --sev-low: #2f6cb0;
  --sev-unknown: #83837c;

  /* Type */
  --font: "Tomorrow", system-ui, sans-serif;
  --mono: ui-monospace, "SF Mono", Menlo, monospace;

  /* Spacing scale */
  --s-1: 4px;  --s-2: 8px;  --s-3: 12px; --s-4: 16px;
  --s-5: 24px; --s-6: 40px; --s-7: 64px; --s-8: 96px; --s-9: 144px;

  /* Motion */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --dur-fast: 150ms;
  --dur-reveal: 0.8s;

  --container: 1200px;
  --gutter: clamp(20px, 4vw, 48px);
  --corner: 14px; /* L-bracket length */
}

/* DARK theme — near-black, warm graphite undertone */
[data-theme="dark"] {
  --bg: #0a0a0b;
  --surface: #101012;
  --surface-2: #16161a;

  --line: rgba(235, 235, 230, 0.08);
  --line-strong: rgba(235, 235, 230, 0.22);

  --text: #f2f1ec;
  --text-2: #a6a6a0;
  --text-3: #6e6e68;

  --on-invert: #060607;
  --header-glass: rgba(10, 10, 11, 0.82);
  --signal-rgb: 242, 241, 236;

  --sev-critical: #ff4d3d;
  --sev-high: #ff9f45;
  --sev-medium: #e8c15a;
  --sev-low: #5f9bd6;
  --sev-unknown: #6e6e68;
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-weight: 300;
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
h1, h2, h3, p, ul, ol, li { margin: 0; padding: 0; }
ul, ol { list-style: none; }
a { color: inherit; text-decoration: none; }
img, canvas { max-width: 100%; display: block; }

:focus-visible {
  outline: 1px solid var(--text);
  outline-offset: 3px;
}

.visually-hidden {
  position: absolute; width: 1px; height: 1px;
  margin: -1px; padding: 0; overflow: hidden;
  clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}

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

.section { padding-block: clamp(96px, 14vh, 176px); }

/* ---------- Utility: mono metadata labels ---------- */
.meta-label {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-3);
}

/* ---------- Header ---------- */
.site-header {
  position: fixed;
  inset-inline: 0;
  top: 0;
  z-index: 10;
  border-bottom: 1px solid transparent;
  transition: background-color 300ms var(--ease-out), border-color 300ms var(--ease-out);
}
.site-header.is-scrolled {
  background: var(--header-glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom-color: var(--line);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.wordmark {
  font-weight: 600;
  font-size: 19px;
  letter-spacing: 0.02em;
}
.wordmark-dot { color: var(--text-3); }
.header-nav { display: flex; align-items: center; gap: var(--s-5); }
.header-link {
  font-size: 13px;
  font-weight: 400;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-2);
  transition: color var(--dur-fast) var(--ease-out);
}
.header-link:hover { color: var(--text); }
.header-cta {
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 10px 18px;
  border: 1px solid var(--line-strong);
  transition: border-color var(--dur-fast) var(--ease-out), background-color var(--dur-fast) var(--ease-out), color var(--dur-fast) var(--ease-out);
}
.header-cta:hover {
  background: var(--text);
  border-color: var(--text);
  color: var(--on-invert);
}

.theme-toggle {
  appearance: none;
  background: none;
  border: none;
  cursor: pointer;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-3);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 0;
  transition: color var(--dur-fast) var(--ease-out);
}
.theme-toggle::before {
  content: "";
  width: 8px;
  height: 8px;
  border: 1px solid currentColor;
  background: linear-gradient(90deg, currentColor 50%, transparent 50%);
}
.theme-toggle:hover { color: var(--text); }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  min-height: 100svh;
  display: grid;
  align-items: center;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
}
.hero-signals {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  opacity: 0.9;
}
.hero-inner {
  position: relative;
  padding-block: 120px;
  max-width: 920px;
  margin-inline: auto;
  text-align: center;
}
.kicker {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--text-3);
  margin-bottom: var(--s-5);
}
.kicker-sep { margin-inline: 0.9em; color: var(--line-strong); }
.hero-heading {
  font-size: clamp(44px, 8.5vw, 104px);
  font-weight: 500;
  line-height: 1.04;
  letter-spacing: -0.015em;
  text-wrap: balance;
}
.hero-sub {
  max-width: 560px;
  margin: var(--s-5) auto 0;
  color: var(--text-2);
  font-size: clamp(16px, 1.6vw, 19px);
  text-wrap: pretty;
}
.hero-actions { margin-top: var(--s-6); }
.button {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 16px 28px;
  border: 1px solid var(--line-strong);
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  transition: background-color var(--dur-fast) var(--ease-out), color var(--dur-fast) var(--ease-out), border-color var(--dur-fast) var(--ease-out);
}
.button .button-arrow { transition: transform 250ms var(--ease-out); }
@media (hover: hover) and (pointer: fine) {
  .button:hover {
    background: var(--text);
    color: var(--on-invert);
    border-color: var(--text);
  }
  .button:hover .button-arrow { transform: translateX(4px); }
}
.button:active { transform: translateY(1px); }

.hero-meta {
  position: absolute;
  inset-inline: 0;
  bottom: 28px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.meta-scroll .meta-tick {
  display: inline-block;
  margin-left: 8px;
  animation: tick-down 2.2s ease-in-out infinite;
}
@keyframes tick-down {
  0%, 100% { transform: translateY(0); opacity: 1; }
  50% { transform: translateY(4px); opacity: 0.4; }
}

/* ---------- Section head (index + name, L-brackets) ---------- */
.section-head {
  display: inline-flex;
  align-items: baseline;
  gap: var(--s-4);
  padding: 10px 18px;
  border: 1px solid var(--line);
  margin-bottom: clamp(40px, 7vh, 80px);
}
.section-index {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--text-3);
  letter-spacing: 0.1em;
}
.section-name {
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--text-2);
}

/* L-shaped corner brackets (background layers — no extra markup) */
.frame-brackets {
  --bk: var(--line-strong);
  background:
    linear-gradient(var(--bk), var(--bk)) left top / var(--corner) 1px no-repeat,
    linear-gradient(var(--bk), var(--bk)) left top / 1px var(--corner) no-repeat,
    linear-gradient(var(--bk), var(--bk)) right top / var(--corner) 1px no-repeat,
    linear-gradient(var(--bk), var(--bk)) right top / 1px var(--corner) no-repeat,
    linear-gradient(var(--bk), var(--bk)) left bottom / var(--corner) 1px no-repeat,
    linear-gradient(var(--bk), var(--bk)) left bottom / 1px var(--corner) no-repeat,
    linear-gradient(var(--bk), var(--bk)) right bottom / var(--corner) 1px no-repeat,
    linear-gradient(var(--bk), var(--bk)) right bottom / 1px var(--corner) no-repeat;
}

.section-heading {
  font-size: clamp(30px, 4.6vw, 56px);
  font-weight: 500;
  line-height: 1.12;
  letter-spacing: -0.01em;
  max-width: 18ch;
  text-wrap: balance;
}
.section-sub {
  margin-top: var(--s-5);
  max-width: 560px;
  color: var(--text-2);
  text-wrap: pretty;
}

/* ---------- Statement ---------- */
.statement { border-bottom: 1px solid var(--line); }
.statement-heading {
  font-size: clamp(34px, 5.4vw, 68px);
  font-weight: 500;
  line-height: 1.1;
  letter-spacing: -0.012em;
  max-width: 16ch;
  text-wrap: balance;
}
.statement-body {
  margin-top: clamp(40px, 6vh, 72px);
  margin-left: auto;
  max-width: 560px;
  color: var(--text-2);
}
.statement-list {
  margin-block: var(--s-5);
  border-top: 1px solid var(--line);
}
.statement-list li {
  padding-block: var(--s-3);
  border-bottom: 1px solid var(--line);
  color: var(--text-2);
}
.statement-close {
  color: var(--text);
  font-weight: 500;
  font-size: 19px;
}

/* ---------- The Signal ---------- */
.signal { border-bottom: 1px solid var(--line); }
.signal-field {
  position: relative;
  overflow: hidden;
  padding-block: clamp(64px, 10vh, 120px);
}
.signal-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}
.signal-copy { position: relative; }
.signal-legend {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--s-5);
  margin-top: clamp(56px, 9vh, 104px);
  padding-top: var(--s-4);
  border-top: 1px solid var(--line);
}
.legend-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--s-5);
}
.legend-title {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-3);
  margin-right: var(--s-4);
}
.legend-item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-2);
}
.dot {
  width: 6px; height: 6px;
  display: inline-block;
}
.dot-critical { background: var(--sev-critical); }
.dot-high     { background: var(--sev-high); }
.dot-medium   { background: var(--sev-medium); }
.dot-low      { background: var(--sev-low); }
.dot-unknown  { background: var(--sev-unknown); }

/* ---------- Steps ---------- */
.steps { border-bottom: 1px solid var(--line); }
.steps-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}
.frame {
  background: var(--bg);
  padding: clamp(28px, 3.5vw, 48px);
}
.step { position: relative; }
.step-number {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--text-3);
  letter-spacing: 0.1em;
}
.step-title {
  margin-top: var(--s-6);
  font-size: clamp(22px, 2.4vw, 30px);
  font-weight: 500;
  letter-spacing: -0.005em;
}
.step-copy {
  margin-top: var(--s-3);
  color: var(--text-2);
  font-size: 15px;
  text-wrap: pretty;
}

/* ---------- Blind spots ---------- */
.blindspots { border-bottom: 1px solid var(--line); }
.blindspots-heading { margin-bottom: clamp(40px, 6vh, 72px); }
.blindspot-list {
  border-top: 1px solid var(--line);
  columns: 2;
  column-gap: var(--s-7);
}
.blindspot-item {
  break-inside: avoid;
  padding-block: var(--s-4);
  border-bottom: 1px solid var(--line);
  font-size: clamp(17px, 1.8vw, 21px);
  font-weight: 400;
  color: var(--text-2);
  position: relative;
  padding-left: 22px;
  transition: color var(--dur-fast) var(--ease-out);
}
.blindspot-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 6px; height: 6px;
  transform: translateY(-50%);
  border: 1px solid var(--text-3);
  transition: background-color var(--dur-fast) var(--ease-out), border-color var(--dur-fast) var(--ease-out);
}
.blindspot-item:hover { color: var(--text); }
.blindspot-item:hover::before { background: var(--text); border-color: var(--text); }
.blindspots-close {
  margin-top: clamp(40px, 6vh, 64px);
  font-size: clamp(22px, 2.6vw, 32px);
  font-weight: 500;
}

/* ---------- Capabilities ---------- */
.capabilities { border-bottom: 1px solid var(--line); }
.capabilities-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}
.capability {
  position: relative;
  transition: background-color 250ms var(--ease-out);
}
.capability:hover { background: var(--surface); }
.capability-index {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--text-3);
  letter-spacing: 0.1em;
}
.capability-title {
  margin-top: var(--s-6);
  font-size: 19px;
  font-weight: 500;
}
.capability-copy {
  margin-top: var(--s-3);
  color: var(--text-2);
  font-size: 15px;
  text-wrap: pretty;
}

/* ---------- Ending ---------- */
.ending {
  padding-block: clamp(120px, 20vh, 224px);
}
.ending-inner { text-align: center; }
.ending-heading {
  font-size: clamp(40px, 7vw, 92px);
  font-weight: 500;
  line-height: 1.08;
  letter-spacing: -0.015em;
}
.ending-line { display: block; }
.ending-brand {
  margin-top: clamp(48px, 8vh, 88px);
  font-size: 22px;
  font-weight: 600;
  letter-spacing: 0.02em;
}
.ending-tagline {
  margin-top: var(--s-2);
  color: var(--text-3);
  font-size: 14px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.ending-contact { margin-top: clamp(40px, 6vh, 64px); }

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--line);
  padding-block: var(--s-5);
}
.footer-inner {
  display: flex;
  justify-content: space-between;
  gap: var(--s-4);
  flex-wrap: wrap;
}

/* ---------- Reveal system ---------- */
html.js .reveal {
  opacity: 0;
  transform: translateY(18px);
  transition:
    opacity var(--dur-reveal) var(--ease-out),
    transform var(--dur-reveal) var(--ease-out);
  transition-delay: var(--reveal-delay, 0ms);
}
html.js .reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}
/* Hoverable revealed elements: keep hover transitions from being
   clobbered by the reveal transition (per-property, zero-delay hover) */
html.js .capability.reveal {
  transition:
    opacity var(--dur-reveal) var(--ease-out) var(--reveal-delay, 0ms),
    transform var(--dur-reveal) var(--ease-out) var(--reveal-delay, 0ms),
    background-color 250ms var(--ease-out) 0ms;
}
html.js .blindspot-item.reveal {
  transition:
    opacity var(--dur-reveal) var(--ease-out) var(--reveal-delay, 0ms),
    transform var(--dur-reveal) var(--ease-out) var(--reveal-delay, 0ms),
    color var(--dur-fast) var(--ease-out) 0ms;
}

/* Word-by-word reveal */
.word-reveal { visibility: visible; }
html.js [data-word-reveal]:not(.is-ready) { opacity: 0; }
.word-reveal__word {
  display: inline-block;
  opacity: 0;
  transform: translate3d(0, 20px, 0);
  transition:
    opacity var(--dur-reveal) var(--ease-out),
    transform var(--dur-reveal) var(--ease-out);
  transition-delay: calc(var(--word-index) * 0.07s);
}
.is-visible .word-reveal__word,
[data-word-reveal].is-visible .word-reveal__word {
  opacity: 1;
  transform: translate3d(0, 0, 0);
}

/* Scroll-scrubbed statement words */
html.js [data-scrub-reveal] .scrub-word {
  opacity: 0.16;
  transition: opacity 350ms linear;
}
html.js [data-scrub-reveal] .scrub-word.is-lit { opacity: 1; }

/* ---------- Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  html.js .reveal,
  html.js [data-word-reveal]:not(.is-ready),
  .word-reveal__word,
  html.js [data-scrub-reveal] .scrub-word {
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
  }
  .meta-scroll .meta-tick { animation: none; }
}

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .steps-grid { grid-template-columns: 1fr; }
  .capabilities-grid { grid-template-columns: repeat(2, 1fr); }
  .statement-body { margin-left: 0; }
}
@media (max-width: 640px) {
  body { font-size: 16px; }
  .capabilities-grid { grid-template-columns: 1fr; }
  .blindspot-list { columns: 1; }
  .header-link { display: none; }
  .hero-meta { justify-content: center; }
  .hero-meta [data-coords] { display: none; }
  .hero-meta .meta-label:first-child { display: none; }
}