:root {
  --page: #020810;
  --surface: #0a1628;
  --surface-alt: #0f1f35;
  --text: #eef6ff;
  --muted: rgba(238, 246, 255, 0.58);
  --accent: #4dc4ff;
  --accent-alt: #8dd8ff;
  --accent-deep: #1a6fd4;
  --accent-warm: #ff5c7a;
  --line: rgba(238, 246, 255, 0.14);
  --line-strong: rgba(238, 246, 255, 0.24);
  --rail-w: clamp(220px, 18vw, 280px);
  --content-max: 1680px;
  --section-space: clamp(72px, 8vw, 120px);
  --radius: 4px;
  --font-display: "Segoe UI", system-ui, -apple-system, sans-serif;
  --font-mono: ui-monospace, "Cascadia Code", "Segoe UI Mono", Menlo, monospace;
}

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

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

body {
  margin: 0;
  min-width: 0;
  overflow-x: hidden;
  line-height: 1.55;
  font-family: var(--font-display);
  background: var(--page);
  color: var(--text);
  background-image:
    radial-gradient(ellipse 120% 80% at 100% 0%, rgba(77, 196, 255, 0.08), transparent 55%),
    radial-gradient(ellipse 80% 60% at 0% 100%, rgba(26, 111, 212, 0.1), transparent 50%),
    linear-gradient(180deg, var(--page), #061018 40%, var(--page));
}

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

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

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

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

h1 {
  font-size: clamp(2.4rem, 4.8vw, 4.6rem);
  line-height: 1.02;
  letter-spacing: -0.04em;
  margin-bottom: 1.25rem;
  font-weight: 500;
}

h2 {
  font-size: clamp(1.85rem, 3.2vw, 3rem);
  line-height: 1.08;
  letter-spacing: -0.03em;
  margin-bottom: 0.85rem;
  font-weight: 500;
}

h3 {
  font-size: clamp(1.05rem, 1.6vw, 1.35rem);
  line-height: 1.25;
  font-weight: 600;
}

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

.page-shell {
  display: grid;
  grid-template-columns: var(--rail-w) minmax(0, 1fr);
  min-height: 100vh;
  max-width: 2160px;
  margin: 0 auto;
}

.site-rail {
  position: sticky;
  top: 0;
  align-self: start;
  z-index: 40;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  min-height: 100vh;
  padding: clamp(1rem, 2vw, 1.75rem);
  border-right: 1px solid var(--line);
  background: color-mix(in srgb, var(--page) 88%, var(--surface));
  backdrop-filter: blur(12px);
}

.rail-brand-row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  min-width: 0;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  font-weight: 700;
  font-size: 1rem;
  white-space: nowrap;
  min-width: 0;
}

.brand-logo {
  display: block;
  width: clamp(44px, 4vw, 64px);
  height: clamp(44px, 4vw, 64px);
  max-width: 64px;
  max-height: 64px;
  border-radius: var(--radius);
  object-fit: contain;
  overflow: hidden;
  flex: 0 0 auto;
  border: 1px solid var(--line-strong);
}

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

.brand small {
  display: block;
  font-size: 0.62rem;
  font-weight: 500;
  color: var(--muted);
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.rail-nav {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  flex: 1 1 auto;
  min-width: 0;
}

.rail-nav a {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--muted);
  padding: 0.55rem 0.65rem;
  border-left: 2px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}

.rail-nav a:hover {
  color: var(--text);
  border-left-color: var(--accent);
  background: rgba(77, 196, 255, 0.06);
}

.rail-cta-wrap {
  margin-top: auto;
  padding-top: 1rem;
  border-top: 1px solid var(--line);
}

.header-cta,
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.15rem;
  border: 1px solid var(--accent);
  border-radius: var(--radius);
  font-weight: 600;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  transition: background 0.2s ease, color 0.2s ease, box-shadow 0.2s ease;
}

.header-cta {
  width: 100%;
  white-space: nowrap;
}

.header-cta,
.button-primary {
  background: linear-gradient(135deg, var(--accent-alt), var(--accent-deep));
  color: #001018;
  border-color: var(--accent);
}

.button-primary:hover,
.header-cta:hover {
  box-shadow: 0 0 24px rgba(77, 196, 255, 0.35);
}

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

.button-secondary:hover {
  border-color: var(--accent);
  color: var(--accent-alt);
}

.page-main {
  min-width: 0;
}

.section-inner {
  width: min(var(--content-max), calc(100% - clamp(1.5rem, 4vw, 3.5rem)));
  margin: 0 auto;
}

.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, 1.05fr) minmax(300px, 0.95fr);
  gap: clamp(1.5rem, 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: 0.16em;
  font-weight: 600;
  margin-bottom: 1rem;
  color: var(--accent);
}

.lead {
  font-size: clamp(1rem, 1.5vw, 1.25rem);
  max-width: 42rem;
}

.hero-actions {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin: 1.75rem 0 1rem;
}

.geo-line {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--muted);
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.hero-visual {
  overflow: hidden;
  width: 100%;
  min-height: clamp(240px, 32vw, 420px);
  aspect-ratio: 4 / 3;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: var(--surface);
  position: relative;
}

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

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

.section-heading {
  max-width: 52rem;
  margin-bottom: 2rem;
}

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

.fact-disclaimer {
  font-size: 0.78rem !important;
  padding: 0.65rem 0.85rem;
  border-left: 2px solid var(--accent);
  background: rgba(77, 196, 255, 0.07);
  font-family: var(--font-mono);
}

.cards-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.85rem;
}

.card {
  min-width: 0;
  padding: 1.35rem;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: var(--surface);
  transition: border-color 0.25s ease, transform 0.25s ease;
}

.card:hover {
  border-color: color-mix(in srgb, var(--accent) 45%, var(--line));
  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);
  border: 1px solid color-mix(in srgb, var(--accent) 35%, transparent);
  background: rgba(77, 196, 255, 0.06);
  border-radius: var(--radius);
}

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

.icon-draw path {
  stroke-dasharray: 34 8;
  animation: iconDraw 12s linear infinite;
}

.icon-pulse {
  transform-box: fill-box;
  transform-origin: center;
  animation: iconPulse 12s ease-in-out infinite;
}

.icon-slide {
  animation: iconSlide 12s ease-in-out infinite;
}

.icon-spin {
  transform-box: fill-box;
  transform-origin: center;
  animation: iconSpin 14s linear infinite;
}

@keyframes iconDraw {
  to {
    stroke-dashoffset: -84;
  }
}

@keyframes iconPulse {
  50% {
    transform: scale(0.9);
    opacity: 0.75;
  }
}

@keyframes iconSlide {
  50% {
    transform: translateX(3px);
  }
}

@keyframes iconSpin {
  to {
    transform: rotate(360deg);
  }
}

.card-label {
  display: block;
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 0.65rem;
}

.card-value {
  display: block;
  margin-top: 0.85rem;
  color: var(--accent-alt);
  font-size: 1.05rem;
  font-weight: 600;
}

.card small {
  display: block;
  color: var(--muted);
  margin-top: 0.35rem;
  font-size: 0.82rem;
}

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

.stat {
  padding: 1.15rem;
  border-top: 2px solid var(--accent);
  background: var(--surface);
  border-radius: 0 0 var(--radius) var(--radius);
}

.stat strong {
  display: block;
  font-size: 1.85rem;
  font-family: var(--font-mono);
  color: var(--accent-alt);
}

.stat span {
  font-weight: 700;
}

.stat p {
  font-size: 0.82rem;
  margin: 0.4rem 0 0;
}

.process-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.85rem;
  counter-reset: step;
}

.process-list li {
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  padding: 1.25rem;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.step-icon {
  margin-bottom: 0;
}

.geo-chips {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.85rem;
}

.geo-chip {
  padding: 1.15rem 1.2rem;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: var(--surface-alt);
}

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

.geo-chip span {
  color: var(--muted);
  font-size: 0.88rem;
  margin-top: 0.5rem;
}

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

.chapter {
  min-width: 0;
  padding: 1.25rem 1.35rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}

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

.faq-list {
  max-width: 56rem;
}

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

.faq-list summary {
  cursor: pointer;
  font-weight: 700;
}

.faq-list p {
  padding-right: 1.5rem;
}

.contact-grid,
.calculator-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  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-radius: var(--radius);
  border: 1px solid var(--line);
}

.contact-form label,
.calculator-form label {
  display: grid;
  gap: 0.35rem;
  color: var(--muted);
  font-size: 0.82rem;
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

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

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

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

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

.component-calculator {
  background: linear-gradient(135deg, var(--surface-alt), var(--surface));
}

.site-footer {
  padding: clamp(2.5rem, 5vw, 4rem) 0;
  background: color-mix(in srgb, var(--surface) 90%, var(--page));
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr;
  gap: 2rem;
}

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

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

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

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

  .site-rail {
    position: relative;
    min-height: auto;
    flex-direction: row;
    flex-wrap: wrap;
    align-items: center;
    gap: 1rem;
    border-right: none;
    border-bottom: 1px solid var(--line);
  }

  .rail-brand-row {
    flex: 1 1 auto;
  }

  .rail-nav {
    flex-direction: row;
    flex-wrap: wrap;
    flex: 1 1 100%;
    order: 3;
  }

  .rail-nav a {
    border-left: none;
    border-bottom: 2px solid transparent;
  }

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

  .rail-cta-wrap {
    margin-top: 0;
    padding-top: 0;
    border-top: none;
    width: auto;
  }

  .header-cta {
    width: auto;
  }

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

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

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

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

@media (max-width: 640px) {
  .section-inner {
    width: min(100% - 1.5rem, var(--content-max));
  }

  .site-rail {
    padding: 0.85rem 1rem;
  }

  .rail-nav {
    display: none;
  }

  .rail-cta-wrap {
    margin-left: auto;
  }

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

  .section {
    padding: 64px 0;
  }

  h1 {
    font-size: clamp(2rem, 11vw, 3.2rem);
  }

  h2 {
    font-size: clamp(1.65rem, 8vw, 2.4rem);
  }
}

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

  .card-icon,
  .step-icon,
  .card-icon svg,
  .step-icon svg,
  .card-icon path,
  .step-icon path,
  .card {
    animation: none !important;
    transition: none !important;
  }
}