/* SIDERUNE — landing page styles
   Plain CSS, no framework, no preprocessor, no external requests. */

:root {
  --bg: #05060a;
  --bg-elevated: #0d0f16;
  --bg-elevated-2: #11141d;
  --line: #232733;
  --line-strong: #343b4d;
  --text: #e9ebf1;
  --text-dim: #9aa1b2;
  --accent: #6ee7d0;
  --accent-dim: #4fb3a3;
  --warn: #f2a65a;
  --ok: #8be28f;
  --max-width: 72rem;
  --space-1: 0.5rem;
  --space-2: 1rem;
  --space-3: 1.5rem;
  --space-4: 2.5rem;
  --space-5: 4rem;
  --space-6: 6rem;
  --radius: 10px;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui,
    "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, "SFMono-Regular", Menlo, Consolas,
    "Liberation Mono", monospace;
}

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

html {
  color-scheme: dark;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: var(--accent);
  text-decoration-color: var(--accent-dim);
}

a:hover {
  text-decoration-thickness: 2px;
}

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

h1,
h2,
h3 {
  font-weight: 600;
  letter-spacing: -0.01em;
  line-height: 1.2;
  margin: 0 0 var(--space-2);
}

h1 {
  font-size: clamp(1.9rem, 4.5vw + 1rem, 3.25rem);
}

h2 {
  font-size: clamp(1.4rem, 2vw + 1rem, 2rem);
}

p {
  margin: 0 0 var(--space-2);
  color: var(--text-dim);
  max-width: 40em;
}

ul,
ol {
  margin: 0;
  padding: 0;
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 var(--space-1);
}

/* Skip link */
.skip-link {
  position: absolute;
  left: -999px;
  top: auto;
  background: var(--bg-elevated);
  color: var(--text);
  padding: 0.75rem 1rem;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  z-index: 100;
}

.skip-link:focus {
  left: var(--space-2);
  top: var(--space-2);
}

/* Layout */
.wrap {
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: var(--space-3);
}

section {
  padding-block: var(--space-5);
  border-top: 1px solid var(--line);
}

section:first-of-type {
  border-top: none;
}

#example {
  padding-top: var(--space-4);
}

.section-head {
  max-width: 40em;
  margin-bottom: var(--space-4);
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(5, 6, 10, 0.85);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--line);
}

.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-block: var(--space-2);
  gap: var(--space-2);
}

.wordmark {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 1rem;
  letter-spacing: 0.06em;
  color: var(--text);
  text-decoration: none;
}

.wordmark img {
  width: 22px;
  height: 22px;
}

.site-nav ul {
  list-style: none;
  display: flex;
  gap: var(--space-3);
}

.site-nav a {
  color: var(--text-dim);
  text-decoration: none;
  font-size: 0.925rem;
}

.site-nav a:hover,
.site-nav a:focus-visible {
  color: var(--text);
}

/* Hero */
.hero {
  position: relative;
  overflow: hidden;
  padding-block: var(--space-5) var(--space-4);
}

.hero__constellation {
  position: absolute;
  inset: -10% -5% auto -5%;
  height: 130%;
  width: 110%;
  opacity: 0.5;
  pointer-events: none;
  z-index: 0;
}

.hero__content {
  position: relative;
  z-index: 1;
  max-width: 44em;
}

.hero p.lede {
  font-size: 1.15rem;
  color: var(--text-dim);
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: var(--space-2);
}

.button {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius);
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
  border: 1px solid transparent;
}

.button--primary {
  background: var(--accent);
  color: #04211d;
}

.button--primary:hover {
  background: #86ecd9;
}

.button--ghost {
  border-color: var(--line-strong);
  color: var(--text);
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 0.9rem;
}

.button--ghost:hover {
  border-color: var(--accent-dim);
  color: var(--accent);
}

/* Canonical chain: forensic timeline.
   Mobile: vertical rail, top-to-bottom. Desktop: one horizontal rail, left-to-right. */
.chain {
  list-style: none;
  position: relative;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  padding-left: 2rem;
}

.chain::before {
  content: "";
  position: absolute;
  left: 0.45rem;
  top: 0.9rem;
  bottom: 0.9rem;
  width: 2px;
  background: linear-gradient(to bottom, var(--accent-dim), var(--line-strong) 45%, var(--warn) 75%, var(--ok));
}

.chain__node {
  position: relative;
}

.chain__node::before {
  content: "";
  position: absolute;
  left: -2rem;
  top: 0.9rem;
  width: 0.95rem;
  height: 0.95rem;
  margin-top: -0.475rem;
  border-radius: 50%;
  background: var(--bg);
  border: 2px solid var(--line-strong);
}

.chain__box {
  border: 1px solid var(--line-strong);
  background: var(--bg-elevated);
  border-radius: var(--radius);
  padding: 0.6rem 0.9rem;
  height: 100%;
}

.chain__label {
  display: block;
  font-weight: 600;
  font-size: 0.95rem;
  line-height: 1.3;
}

.chain__meta {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-dim);
  margin-top: 0.2rem;
}

/* Authority: turquoise */
.chain__node--authority::before { border-color: var(--accent); background: var(--accent); }
.chain__node--authority .chain__box {
  border-color: var(--accent);
  background: color-mix(in srgb, var(--accent) 10%, var(--bg-elevated));
}
.chain__node--authority .chain__label,
.chain__node--authority .chain__meta { color: var(--accent); }
.chain__node--authority .chain__meta { font-size: 1.05rem; font-weight: 600; }

/* Requested / actual effect: amber values, effect is heavier */
.chain__node--requested::before,
.chain__node--effect::before { border-color: var(--warn); }
.chain__node--requested .chain__meta,
.chain__node--effect .chain__meta {
  color: var(--warn);
  font-size: 1.05rem;
  font-weight: 600;
}
.chain__node--effect::before { background: var(--warn); }
.chain__node--effect .chain__box {
  border-color: var(--warn);
  background: color-mix(in srgb, var(--warn) 8%, var(--bg-elevated));
}

/* Verdict: solid amber */
.chain__node--warn::before { border-color: var(--warn); background: var(--warn); }
.chain__node--warn .chain__box {
  border-color: var(--warn);
  background: var(--warn);
}
.chain__node--warn .chain__label,
.chain__node--warn .chain__meta { color: #2a1804; }
.chain__node--warn .chain__label { letter-spacing: 0.06em; }

/* Evidence: green */
.chain__node--ok::before { border-color: var(--ok); background: var(--ok); }
.chain__node--ok .chain__box {
  border-color: var(--ok);
  background: color-mix(in srgb, var(--ok) 12%, var(--bg-elevated));
}
.chain__node--ok .chain__label,
.chain__node--ok .chain__meta { color: var(--ok); }

@media (min-width: 64rem) {
  .chain {
    display: grid;
    grid-template-columns: repeat(8, minmax(0, 1fr));
    gap: 0.6rem;
    padding: 2rem 0 0;
  }

  .chain::before {
    left: 0;
    right: 0.5rem;
    top: 0.45rem;
    bottom: auto;
    width: auto;
    height: 2px;
    background: linear-gradient(to right, var(--accent-dim), var(--line-strong) 40%, var(--warn) 65%, var(--ok));
  }

  /* arrowhead: unmistakable left-to-right direction */
  .chain::after {
    content: "";
    position: absolute;
    right: 0;
    top: 0.45rem;
    margin-top: -5px;
    border-left: 9px solid var(--ok);
    border-top: 6px solid transparent;
    border-bottom: 6px solid transparent;
  }

  .chain__node::before {
    left: 0.9rem;
    top: -2rem;
    margin-top: 0;
    transform: translateY(0);
  }

  .chain__box { padding: 0.6rem 0.65rem; }
  .chain__label { font-size: 0.9rem; }
  .chain__meta { font-size: 0.75rem; }
  .chain__node--authority .chain__meta,
  .chain__node--requested .chain__meta,
  .chain__node--effect .chain__meta { font-size: 1rem; }
}

/* Authorized vs actual: to-scale comparison (100 : 482) */
.limit {
  margin-top: var(--space-4);
  max-width: 44rem;
}

.limit__row {
  display: grid;
  grid-template-columns: 6.5rem 1fr 3.5rem;
  align-items: center;
  gap: var(--space-2);
  margin-bottom: 0.6rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-dim);
}

.limit__track {
  display: flex;
  height: 0.75rem;
  border-radius: 999px;
  background: var(--bg-elevated-2);
  overflow: hidden;
}

.limit__bar { display: block; height: 100%; }
.limit__bar--auth { width: 20.75%; background: var(--accent); }
.limit__bar--within { width: 20.75%; background: var(--accent); }
.limit__bar--over { width: 79.25%; background: var(--warn); }

.limit__val { color: var(--text); font-weight: 600; text-align: right; }
.limit__val--over { color: var(--warn); }

.limit__delta {
  grid-column: 2;
  margin: 0;
  max-width: none;
  padding-left: 20.75%;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--warn);
}

@media (max-width: 30rem) {
  .limit__row { grid-template-columns: 1fr 3.5rem; }
  .limit__name { grid-column: 1 / -1; }
  .limit__row--delta > span { display: none; }
  .limit__delta { grid-column: 1 / -1; padding-left: 0; }
}

.diagram-caption {
  margin-top: var(--space-3);
  font-size: 0.9rem;
}

/* Seven questions */
.questions {
  list-style: none;
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-2);
  counter-reset: q;
}

.questions li {
  counter-increment: q;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: var(--space-2) var(--space-3);
  position: relative;
  padding-left: 3rem;
  color: var(--text);
}

.questions li::before {
  content: counter(q, decimal-leading-zero);
  position: absolute;
  left: 1rem;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-mono);
  color: var(--accent);
  font-size: 0.85rem;
}

@media (min-width: 720px) {
  .questions {
    grid-template-columns: 1fr 1fr;
  }
}

/* Pipeline (how it works) */
.pipeline {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.pipeline li {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: 0.75rem 0;
  border-bottom: 1px dashed var(--line);
  font-weight: 500;
}

.pipeline li:last-child {
  border-bottom: none;
}

.pipeline li:not(:last-child)::after {
  content: "→";
  margin-left: auto;
  color: var(--text-dim);
}

@media (min-width: 780px) {
  .pipeline {
    flex-direction: row;
  }

  .pipeline li {
    border-bottom: none;
    flex-direction: column;
    align-items: flex-start;
    text-align: left;
  }

  .pipeline li:not(:last-child)::after {
    margin-left: 0;
    margin-top: 0.5rem;
  }
}

.disclaimer {
  font-size: 0.85rem;
  border-left: 2px solid var(--line-strong);
  padding-left: var(--space-2);
  margin-top: var(--space-3);
}

/* Audience */
.audience-tags {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.audience-tags li {
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  padding: 0.4rem 0.9rem;
  font-size: 0.875rem;
  color: var(--text);
}

/* Trust list */
.trust-list {
  list-style: none;
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-2);
}

.trust-list li {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: var(--space-2) var(--space-3);
}

.trust-list li strong {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--accent);
  margin-bottom: 0.25rem;
}

.trust-list li p {
  margin: 0;
  font-size: 0.9rem;
}

@media (min-width: 720px) {
  .trust-list {
    grid-template-columns: 1fr 1fr;
  }
}

/* Contact / closing */
.closing {
  text-align: left;
}

.closing__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: var(--space-3);
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--line);
  padding-block: var(--space-3);
}

.site-footer .wrap {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: var(--space-2);
  font-size: 0.85rem;
  color: var(--text-dim);
}

.site-footer a {
  color: var(--text-dim);
}

/* Motion: off by default, enabled only when the visitor hasn't asked for reduced motion */
@media (prefers-reduced-motion: no-preference) {
  .hero__constellation circle.pulse {
    animation: pulse 4.5s ease-in-out infinite;
  }

  @keyframes pulse {
    0%,
    100% {
      opacity: 0.35;
    }
    50% {
      opacity: 0.9;
    }
  }
}