:root {
  --bg: #0f1419;
  --panel: #171d25;
  --ink: #e8eef6;
  --muted: #9aa8b8;
  --line: rgba(232, 238, 246, 0.12);
  --accent: #3dffa8;
  --accent-ink: #04140d;
  --warn: #ffb020;
  --font-display: "Syne", sans-serif;
  --font-body: "Manrope", sans-serif;
  --radius: 0;
  --ease: cubic-bezier(0.2, 0.8, 0.2, 1);
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.6;
  background: var(--bg);
}

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

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

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
}

/* Shell: left rail + content */
.shell {
  min-height: 100vh;
  display: grid;
}

@media (min-width: 960px) {
  .shell {
    grid-template-columns: minmax(320px, 42vw) 1fr;
  }
}

.rail {
  position: relative;
  padding: 1.5rem 1.25rem 2rem;
  background:
    linear-gradient(160deg, rgba(61, 255, 168, 0.08), transparent 40%),
    var(--panel);
  border-bottom: 1px solid var(--line);
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

@media (min-width: 960px) {
  .rail {
    position: sticky;
    top: 0;
    height: 100vh;
    border-bottom: 0;
    border-right: 1px solid var(--line);
    padding: 2rem 1.75rem;
    justify-content: space-between;
  }
}

.rail-top {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.brand-lockup {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
}

.brand {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.65rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.brand span {
  color: var(--accent);
}

.rail-note {
  margin: 0;
  color: var(--muted);
  font-size: 0.85rem;
}

.rail h1 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  line-height: 1.05;
  letter-spacing: -0.02em;
}

.rail-lead {
  margin: 0;
  color: var(--muted);
  max-width: 28ch;
}

.vin-box {
  display: grid;
  gap: 0.65rem;
  margin-top: 0.5rem;
}

.vin-box label {
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

.vin-box input {
  width: 100%;
  border: 1px solid var(--line);
  background: #0c1015;
  color: var(--ink);
  padding: 0.95rem 1rem;
  font-family: var(--font-display);
  font-size: 1.05rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  outline: none;
}

.vin-box input:focus {
  border-color: var(--accent);
}

.vin-box button {
  border: 0;
  background: var(--accent);
  color: var(--accent-ink);
  min-height: 3.1rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.95rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  cursor: pointer;
}

.vin-box button:hover {
  filter: brightness(1.05);
}

.form-hint {
  min-height: 1.2rem;
  margin: 0;
  font-size: 0.85rem;
  color: var(--muted);
}

.form-hint.error {
  color: #ff8f8f;
}

.form-hint.ok {
  color: var(--accent);
}

.rail-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.25rem;
  font-size: 0.9rem;
  color: var(--muted);
}

.rail-links a:hover {
  color: var(--ink);
}

.content {
  padding: 1.5rem 1.25rem 3rem;
}

@media (min-width: 960px) {
  .content {
    padding: 2.5rem 3rem 4rem;
  }
}

.strip {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 2rem;
}

.chip {
  border: 1px solid var(--line);
  padding: 0.35rem 0.7rem;
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--muted);
}

.block {
  margin-bottom: 2.75rem;
  padding-bottom: 2.75rem;
  border-bottom: 1px solid var(--line);
}

.block:last-child {
  border-bottom: 0;
}

.block h2 {
  margin: 0 0 0.75rem;
  font-family: var(--font-display);
  font-size: clamp(1.4rem, 3vw, 2rem);
  line-height: 1.1;
}

.block p {
  margin: 0 0 1rem;
  color: var(--muted);
  max-width: 62ch;
}

.matrix {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

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

.matrix article {
  background: var(--bg);
  padding: 1.2rem 1.1rem;
}

.matrix h3 {
  margin: 0 0 0.4rem;
  font-family: var(--font-display);
  font-size: 1.05rem;
}

.matrix p {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.steps-row {
  display: grid;
  gap: 1rem;
  counter-reset: step;
}

@media (min-width: 720px) {
  .steps-row {
    grid-template-columns: repeat(3, 1fr);
  }
}

.steps-row li {
  list-style: none;
  border-top: 2px solid var(--accent);
  padding-top: 0.85rem;
}

.steps-row strong {
  display: block;
  font-family: var(--font-display);
  margin-bottom: 0.35rem;
}

.steps-row span {
  color: var(--muted);
  font-size: 0.95rem;
}

.articles-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.articles-list li {
  border-top: 1px solid var(--line);
}

.articles-list a {
  display: grid;
  gap: 0.25rem;
  padding: 1rem 0;
}

.articles-list a:hover strong {
  color: var(--accent);
}

.articles-list strong {
  font-family: var(--font-display);
  font-size: 1.02rem;
}

.articles-list span {
  color: var(--muted);
  font-size: 0.9rem;
}

.footer-mini {
  margin-top: 2rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.85rem;
}

.footer-mini nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1rem;
  margin-top: 0.75rem;
}

.footer-mini a {
  text-decoration: underline;
  text-underline-offset: 0.15em;
}

/* Article pages */
.page-wrap {
  width: min(820px, calc(100% - 2rem));
  margin: 0 auto;
  padding: 2rem 0 4rem;
}

.page-nav {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 2rem;
  font-family: var(--font-display);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  font-size: 0.85rem;
}

.page-nav a:hover {
  color: var(--accent);
}

.page-wrap h1 {
  margin: 0 0 0.85rem;
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  line-height: 1.05;
}

.page-lead {
  color: var(--muted);
  font-size: 1.08rem;
  margin: 0 0 1.75rem;
}

.page-wrap h2 {
  margin: 2rem 0 0.7rem;
  font-family: var(--font-display);
  font-size: 1.25rem;
}

.page-wrap p {
  color: var(--muted);
  margin: 0 0 0.95rem;
}

.page-cta {
  margin-top: 2rem;
  padding: 1.25rem;
  border: 1px solid var(--line);
  background: var(--panel);
}

.page-cta a {
  display: inline-flex;
  margin-top: 0.75rem;
  padding: 0.75rem 1.1rem;
  background: var(--accent);
  color: var(--accent-ink);
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.related {
  margin-top: 2.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--line);
}

.related ul {
  margin: 0.75rem 0 0;
  padding-left: 1.1rem;
  display: grid;
  gap: 0.4rem;
}

.related a {
  color: var(--ink);
  text-decoration: underline;
  text-underline-offset: 0.14em;
}