:root {
  --ink: #05080e;
  --navy: #0a121e;
  --graphite: #121a26;
  --line: rgb(140 170 190 / 0.16);
  --line-strong: rgb(140 170 190 / 0.32);
  --paper: #e8ecef;
  --paper-soft: rgb(232 236 239 / 0.82);
  --mute: #8794a6;
  /* brand: sampled from the CertiLink and Certi-Lock marks */
  --brand-orange: #ff8a24;
  --brand-mint: #45e3a6;
  --brand-green: #6aea5e;
  --brand-cyan: #22c8ef;

  /* semantic accents: "teal" = primary/interactive, "amber" = time, status, caution */
  --teal: var(--brand-mint);
  --teal-dim: rgb(69 227 166 / 0.13);
  --amber: var(--brand-orange);
  --amber-dim: rgb(255 138 36 / 0.13);
  --signal: #ff5f52;

  --font-display: "Sora", ui-sans-serif, system-ui, sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, "Cascadia Mono", monospace;

  --text-body: clamp(1rem, 0.94rem + 0.25vw, 1.0625rem);
  --text-lead: clamp(1.05rem, 0.95rem + 0.4vw, 1.25rem);
  --text-h3: clamp(1.3rem, 1.05rem + 0.9vw, 1.85rem);
  --text-h2: clamp(2.1rem, 1.3rem + 3vw, 4rem);
  --text-h1: clamp(2.6rem, 1.1rem + 5.6vw, 6.25rem);
  --text-label: 0.72rem;

  --gutter: clamp(16px, 4vw, 56px);
  --space-section: clamp(5rem, 3rem + 7vw, 11rem);
  --content-max: 88rem;

  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --duration: 420ms;
}

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

html { background: var(--ink); color-scheme: dark; scroll-padding-top: 1rem; }

body {
  margin: 0;
  background:
    radial-gradient(120% 60% at 80% -10%, rgb(69 227 166 / 0.07), transparent 60%),
    var(--ink);
  color: var(--paper);
  font: 300 var(--text-body) / 1.65 var(--font-display);
  -webkit-font-smoothing: antialiased;
  overflow-x: clip;
}

h1, h2, h3, h4 { margin: 0; font-weight: 600; letter-spacing: -0.025em; line-height: 1.06; text-wrap: balance; }
p, ul, ol, figure, blockquote, dl, dd { margin: 0; }
ul, ol { padding: 0; }
a { color: inherit; }

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

.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;
}

.skip-link {
  position: absolute; left: var(--gutter); top: -100px; z-index: 20;
  padding: 0.6rem 1rem; background: var(--teal); color: var(--ink);
  font: 500 var(--text-label) / 1 var(--font-mono); text-transform: uppercase; letter-spacing: 0.12em;
}
.skip-link:focus { top: 12px; }

.eyebrow, .label {
  font: 500 var(--text-label) / 1.4 var(--font-mono);
  letter-spacing: 0.16em;
  text-transform: uppercase;
}
.eyebrow { color: var(--teal); }
.label { color: var(--mute); }

/* ---------- site header ---------- */

.site-header {
  position: relative; z-index: 5;
  display: flex; align-items: center; justify-content: space-between; gap: 1.5rem;
  padding: 1.1rem var(--gutter);
  border-bottom: 1px solid var(--line);
}
.site-header__mark {
  display: inline-flex; align-items: center; gap: 0.55rem; text-decoration: none;
}
.site-header__mark img { width: 34px; height: auto; filter: drop-shadow(0 0 10px rgb(69 227 166 / 0.25)); }

/* live-text wordmark in the logo's colours: orange C, white "erti", mint→green "Link" */
.wordmark { font-weight: 600; font-size: 1.15rem; letter-spacing: -0.02em; color: var(--paper); }
.wordmark__c { color: var(--brand-orange); }
.wordmark__link {
  background: linear-gradient(90deg, var(--brand-mint), var(--brand-green));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}

.site-nav ul { display: flex; align-items: center; gap: clamp(1rem, 2.2vw, 2.2rem); list-style: none; }
.site-nav a {
  font: 500 var(--text-label) / 1 var(--font-mono); letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--mute); text-decoration: none; padding-block: 0.5rem;
  transition: color var(--duration) var(--ease-out);
}
.site-nav a:hover, .site-nav a[aria-current="page"] { color: var(--paper); }

.site-menu { display: none; }

@media (max-width: 859px) {
  .site-nav { display: none; }
  .site-menu { display: block; position: relative; }
  .site-menu summary {
    list-style: none; cursor: pointer; padding: 0.55rem 0.8rem; border: 1px solid var(--line-strong);
    font: 500 var(--text-label) / 1 var(--font-mono); letter-spacing: 0.14em; text-transform: uppercase;
  }
  .site-menu summary::-webkit-details-marker { display: none; }
  .site-menu[open] summary { border-color: var(--teal); color: var(--teal); }
  .site-menu ul {
    position: absolute; right: 0; top: calc(100% + 0.5rem); min-width: 15rem;
    display: grid; list-style: none; padding: 0.5rem; background: var(--graphite);
    border: 1px solid var(--line-strong); box-shadow: 0 24px 60px -20px rgb(0 0 0 / 0.8);
  }
  .site-menu a {
    display: block; padding: 0.8rem; text-decoration: none;
    font: 500 var(--text-label) / 1 var(--font-mono); letter-spacing: 0.14em; text-transform: uppercase;
  }
  .site-menu a:hover { background: var(--teal-dim); }
}

/* ---------- buttons ---------- */

.button {
  display: inline-flex; align-items: center; gap: 0.7rem;
  padding: 1rem 1.35rem; border: 1px solid var(--line-strong);
  color: var(--paper); text-decoration: none; background: transparent;
  font: 500 var(--text-label) / 1 var(--font-mono); letter-spacing: 0.14em; text-transform: uppercase;
  transition: border-color var(--duration) var(--ease-out), background-color var(--duration) var(--ease-out), color var(--duration) var(--ease-out);
}
.button:hover { border-color: var(--teal); background: var(--teal-dim); }
.button:active { transform: translateY(1px); }
.button--primary { background: var(--teal); border-color: var(--teal); color: var(--ink); }
.button--primary:hover { background: var(--brand-green); border-color: var(--brand-green); color: var(--ink); }
.button span[aria-hidden] { transition: transform var(--duration) var(--ease-out); }
.button:hover span[aria-hidden] { transform: translateX(3px); }

/* ---------- section scaffold ---------- */

.section {
  padding: var(--space-section) var(--gutter);
  border-top: 1px solid var(--line);
}
.section__inner { max-width: var(--content-max); margin-inline: auto; }
.section__head { display: grid; gap: 1.2rem; max-width: 52rem; }
.section__head h2 { font-size: var(--text-h2); }
.section__lede { color: var(--mute); font-size: var(--text-lead); max-width: 42rem; }
.section__note {
  margin-top: clamp(2rem, 4vw, 3rem); max-width: 46rem; padding-left: 1rem;
  border-left: 1px solid var(--amber);
  font: 400 0.86rem / 1.6 var(--font-mono); color: var(--mute);
}

.status-tag {
  display: inline-flex; align-items: center; gap: 0.5rem;
  padding: 0.35rem 0.6rem; border: 1px solid rgb(255 138 36 / 0.4); color: var(--amber);
  font: 500 0.66rem / 1 var(--font-mono); letter-spacing: 0.14em; text-transform: uppercase;
}
.status-tag::before { content: ""; width: 6px; height: 6px; border-radius: 50%; background: currentColor; }

/* ---------- footer ---------- */

.site-footer {
  display: flex; flex-wrap: wrap; justify-content: space-between; gap: 1rem 2rem;
  padding: 2.2rem var(--gutter);
  border-top: 1px solid var(--line);
  font: 400 var(--text-label) / 1.6 var(--font-mono); letter-spacing: 0.08em; color: var(--mute);
}
.site-footer a { color: var(--paper); text-decoration-color: var(--line-strong); text-underline-offset: 3px; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    transition-duration: 1ms !important; animation-duration: 1ms !important;
    animation-iteration-count: 1 !important; scroll-behavior: auto !important;
  }
}

.site-footer { align-items: center; }
.site-footer__brand { display: inline-flex; align-items: center; gap: 0.5rem; text-decoration: none; }
.site-footer__brand img { width: 28px; height: auto; }
.site-footer__brand .wordmark { font-size: 1rem; }