/* Slon variant 1 — cobalt instrument rail layout */
:root {
  --page: #080516;
  --surface: #0f1024;
  --surface-raised: #161833;
  --text: #eef2ff;
  --muted: #8b93b8;
  --accent: #2f5bff;
  --accent-bright: #5b7cff;
  --accent-ink: #05070f;
  --line: color-mix(in srgb, var(--text) 16%, transparent);
  --line-strong: color-mix(in srgb, var(--accent) 42%, transparent);
  --radius: 2px;
  --radius-lg: 6px;
  --rail-w: 272px;
  --content-max: 1180px;
  --section-space: clamp(4rem, 7vw, 6.5rem);
  --font-display: "Bahnschrift", "Segoe UI", system-ui, sans-serif;
  --font-body: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-mono: ui-monospace, "Cascadia Code", "Segoe UI Mono", monospace;
  --ease: cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
  scroll-behavior: smooth;
  overflow-x: hidden;
}

body {
  margin: 0;
  min-width: 0;
  overflow-x: hidden;
  line-height: 1.62;
  font-family: var(--font-body);
  background: var(--page);
  color: var(--text);
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background:
    linear-gradient(90deg, color-mix(in srgb, var(--accent) 6%, transparent) 1px, transparent 1px) 0 0 / 64px 64px,
    linear-gradient(color-mix(in srgb, var(--accent) 5%, transparent) 1px, transparent 1px) 0 0 / 64px 64px,
    radial-gradient(ellipse 80% 50% at 72% -10%, color-mix(in srgb, var(--accent) 14%, transparent), transparent 55%);
  opacity: 0.85;
}

body,
button,
input,
select,
textarea {
  font: inherit;
}

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

a {
  color: inherit;
  text-decoration: none;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1,
h2,
h3 {
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: -0.03em;
}

h1 {
  font-size: clamp(2.35rem, 4.8vw, 4.25rem);
  line-height: 1.02;
  margin-bottom: 1.25rem;
}

h2 {
  font-size: clamp(1.75rem, 3.2vw, 2.85rem);
  line-height: 1.08;
  margin-bottom: 0.85rem;
}

h3 {
  font-size: clamp(1.05rem, 1.6vw, 1.3rem);
  line-height: 1.22;
}

p {
  color: var(--muted);
}

.page-shell {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: var(--rail-w) minmax(0, 1fr);
  min-height: 100vh;
}

.site-rail {
  position: sticky;
  top: 0;
  align-self: start;
  height: 100vh;
  display: grid;
  grid-template-rows: auto 1fr auto;
  gap: 1.5rem;
  padding: 1.35rem 1.1rem 1.5rem;
  border-right: 1px solid var(--line);
  background: color-mix(in srgb, var(--page) 92%, var(--surface));
  backdrop-filter: blur(12px);
}

.rail-brand-row,
.rail-nav-row,
.rail-cta-row {
  min-width: 0;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-weight: 800;
  font-size: 0.95rem;
  line-height: 1.15;
  min-width: 0;
}

.brand-logo {
  display: block;
  width: 48px;
  height: 48px;
  max-width: 64px;
  max-height: 64px;
  flex: 0 0 48px;
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.brand-logo svg {
  width: 100%;
  height: 100%;
}

.brand small {
  display: block;
  font-size: 0.65rem;
  font-weight: 500;
  color: var(--muted);
  font-family: var(--font-mono);
  letter-spacing: 0.04em;
}

.site-rail nav {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  align-self: center;
  width: 100%;
  min-width: 0;
}

.site-rail nav a {
  display: flex;
  align-items: center;
  min-height: 2.5rem;
  padding: 0.45rem 0.75rem;
  font-size: 0.78rem;
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
  border-left: 2px solid transparent;
  border-radius: 0 var(--radius) var(--radius) 0;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background 0.2s var(--ease);
}

.site-rail nav a:hover {
  color: var(--text);
  border-left-color: var(--accent);
  background: color-mix(in srgb, var(--accent) 8%, transparent);
}

.header-cta,
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.78rem 1.15rem;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  font-weight: 700;
  font-size: 0.82rem;
  letter-spacing: 0.02em;
  transition: transform 0.25s var(--ease), background 0.25s var(--ease), border-color 0.25s var(--ease);
}

.rail-cta-row .header-cta {
  width: 100%;
  white-space: normal;
  text-align: center;
}

.header-cta,
.button-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-bright));
  color: var(--accent-ink);
  border-color: var(--accent);
}

.button-secondary {
  background: transparent;
  color: var(--text);
  border-color: var(--line);
}

.header-cta:hover,
.button:hover {
  transform: translateY(-1px);
}

.page-canvas {
  min-width: 0;
  display: flex;
  justify-content: center;
  padding: 0 clamp(1rem, 2.5vw, 2.5rem);
}

.page-main {
  width: min(var(--content-max), 100%);
  padding-bottom: 2rem;
}

.hero {
  padding: clamp(2.5rem, 5vw, 4.5rem) 0 var(--section-space);
  border-bottom: 1px solid var(--line);
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(320px, 0.92fr);
  gap: clamp(1.75rem, 4vw, 3.5rem);
  align-items: center;
}

.hero-copy {
  min-width: 0;
}

.eyebrow,
.section-kicker {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  font-weight: 600;
  color: var(--accent-bright);
  margin-bottom: 0.85rem;
}

.lead {
  font-size: clamp(1rem, 1.5vw, 1.22rem);
  max-width: 42rem;
  color: color-mix(in srgb, var(--text) 78%, var(--muted));
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  margin: 1.75rem 0 1rem;
}

.geo-line {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--muted);
  letter-spacing: 0.06em;
}

.hero-visual {
  overflow: hidden;
  width: 100%;
  aspect-ratio: 3 / 2;
  min-height: 280px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--line-strong);
  background: var(--surface);
  box-shadow: 0 24px 64px color-mix(in srgb, var(--accent) 12%, transparent);
}

.hero-visual svg {
  width: 100%;
  height: 100%;
}

.section {
  padding: var(--section-space) 0;
  border-bottom: 1px solid var(--line);
}

.section:nth-of-type(even) {
  background: color-mix(in srgb, var(--surface) 55%, transparent);
  margin-inline: calc(-1 * clamp(1rem, 2.5vw, 2.5rem));
  padding-inline: clamp(1rem, 2.5vw, 2.5rem);
}

.section-heading {
  max-width: 46rem;
  margin-bottom: 2rem;
}

.section-heading > p {
  font-size: 1.02rem;
}

.fact-disclaimer {
  font-size: 0.78rem !important;
  padding: 0.65rem 0.85rem;
  border-left: 3px solid var(--accent);
  background: color-mix(in srgb, var(--accent) 7%, transparent);
  max-width: 42rem;
}

.cards-grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: 0.85rem;
}

.cards-grid .card {
  grid-column: span 4;
}

.card {
  min-width: 0;
  padding: 1.35rem 1.25rem;
  border-radius: var(--radius-lg);
  background: var(--surface);
  border: 1px solid var(--line);
  transition: border-color 0.3s var(--ease), transform 0.3s var(--ease);
}

.card:hover {
  border-color: var(--line-strong);
  transform: translateY(-2px);
}

.card p {
  margin-bottom: 0;
}

.card-icon,
.step-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  margin-bottom: 0.85rem;
  color: var(--accent-bright);
  border: 1px solid color-mix(in srgb, var(--accent) 35%, transparent);
  background: color-mix(in srgb, var(--accent) 8%, transparent);
  border-radius: var(--radius);
}

.card-icon svg,
.step-icon svg {
  width: 26px;
  height: 26px;
}

.card-label {
  display: block;
  color: var(--accent-bright);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  margin-bottom: 0.55rem;
}

.card-value {
  display: block;
  margin-top: 0.85rem;
  color: var(--accent-bright);
  font-size: 1.1rem;
}

.card small {
  display: block;
  color: var(--muted);
  margin-top: 0.45rem;
  font-size: 0.85rem;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.85rem;
}

.stat {
  padding: 1.15rem 1rem;
  background: var(--surface);
  border: 1px solid var(--line);
  border-top: 2px solid var(--accent);
  border-radius: var(--radius-lg);
}

.stat strong {
  display: block;
  font-family: var(--font-mono);
  font-size: 1.75rem;
  color: var(--accent-bright);
}

.stat span {
  font-weight: 700;
}

.stat p {
  font-size: 0.82rem;
  margin: 0.35rem 0 0;
}

.process-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 0.75rem;
  counter-reset: step;
}

.process-list li {
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  padding: 1.15rem;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
}

.process-list li .step-icon {
  margin-bottom: 0;
}

.geo-chips {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.75rem;
}

.geo-chip {
  padding: 1.1rem 1.15rem;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
}

.geo-chip strong,
.geo-chip span {
  display: block;
}

.geo-chip span {
  color: var(--muted);
  font-size: 0.88rem;
  margin-top: 0.35rem;
}

.component-guide .section-inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 2rem;
}

.guide-body {
  min-width: 0;
  display: grid;
  gap: 1.25rem;
}

.chapter {
  min-width: 0;
  padding: 1.25rem 1.15rem;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
}

.chapter li {
  color: var(--muted);
  margin: 0.45rem 0;
}

.faq-list {
  max-width: 52rem;
  display: grid;
  gap: 0;
}

.faq-list details {
  border-bottom: 1px solid var(--line);
  padding: 0.95rem 0;
}

.faq-list summary {
  cursor: pointer;
  font-weight: 700;
  list-style: none;
}

.faq-list summary::-webkit-details-marker {
  display: none;
}

.faq-list p {
  padding-right: 1rem;
  margin-top: 0.65rem;
}

.contact-grid,
.calculator-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
  gap: clamp(1.5rem, 4vw, 3rem);
  align-items: start;
}

.contact-form,
.calculator-form {
  display: grid;
  gap: 0.85rem;
  background: var(--surface);
  padding: 1.35rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
}

.contact-form label,
.calculator-form label {
  display: grid;
  gap: 0.35rem;
  color: var(--muted);
  font-size: 0.8rem;
  font-family: var(--font-mono);
  letter-spacing: 0.04em;
}

input,
select,
textarea {
  width: 100%;
  min-width: 0;
  border: 1px solid var(--line);
  background: var(--page);
  color: var(--text);
  padding: 0.8rem 0.85rem;
  border-radius: var(--radius);
}

textarea {
  min-height: 110px;
  resize: vertical;
}

output {
  font-family: var(--font-mono);
  font-size: 1.05rem;
  color: var(--accent-bright);
  font-weight: 700;
}

.form-message {
  color: var(--accent-bright);
  margin: 0;
}

.site-footer {
  padding: 3rem 0 2rem;
  margin-top: 1rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr;
  gap: 2rem;
  padding-top: 2rem;
  border-top: 1px solid var(--line);
}

.footer-brand {
  font-size: 1.35rem;
}

.site-footer a {
  display: block;
  color: var(--muted);
  margin: 0.35rem 0;
}

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

@media (min-width: 1440px) {
  :root {
    --content-max: 1280px;
    --rail-w: 288px;
  }

  .page-canvas {
    padding-inline: clamp(1.5rem, 3vw, 3rem);
  }

  .hero-grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(380px, 0.95fr);
  }
}

@media (min-width: 1920px) {
  :root {
    --content-max: 1360px;
  }
}

@media (max-width: 1100px) {
  .page-shell {
    grid-template-columns: 1fr;
  }

  .site-rail {
    position: relative;
    height: auto;
    grid-template-rows: auto auto auto;
    border-right: 0;
    border-bottom: 1px solid var(--line);
    padding: 0.85rem 1rem 1rem;
  }

  .rail-brand-row {
    display: flex;
    align-items: center;
  }

  .rail-nav-row {
    align-self: auto;
  }

  .site-rail nav {
    flex-direction: row;
    flex-wrap: wrap;
    gap: 0.35rem;
  }

  .site-rail nav a {
    border-left: 0;
    border-bottom: 2px solid transparent;
    border-radius: var(--radius);
    padding: 0.4rem 0.65rem;
    min-height: auto;
  }

  .site-rail nav a:hover {
    border-bottom-color: var(--accent);
  }

  .rail-cta-row .header-cta {
    width: auto;
  }

  .hero-grid,
  .contact-grid,
  .calculator-grid {
    grid-template-columns: 1fr;
  }

  .cards-grid .card {
    grid-column: span 6;
  }

  .process-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .stats-grid,
  .geo-chips {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 640px) {
  .page-canvas {
    padding-inline: 0.85rem;
  }

  .section:nth-of-type(even) {
    margin-inline: -0.85rem;
    padding-inline: 0.85rem;
  }

  .hero {
    padding-top: 1.75rem;
  }

  .hero-visual {
    min-height: 220px;
  }

  .cards-grid {
    grid-template-columns: 1fr;
  }

  .cards-grid .card,
  .process-list,
  .stats-grid,
  .geo-chips,
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .process-list li {
    flex-direction: row;
  }

  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .button,
  .header-cta {
    width: 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .card:hover,
  .header-cta:hover,
  .button:hover {
    transform: none;
  }
}