/* ============================================================
   LARGUS · K4M — landing
   ============================================================ */

:root {
  --bg: #08090b;
  --bg-2: #0c0e11;
  --panel: #101318;
  --panel-2: #151920;
  --line: #22262e;
  --line-soft: #1a1e25;
  --text: #eef1f5;
  --muted: #9aa3af;
  --dim: #6b7480;
  --accent: #ff6a2b;
  --accent-2: #ffb066;
  --accent-soft: rgba(255, 106, 43, 0.12);
  --radius: 18px;
  --radius-sm: 12px;
  --max: 1200px;
  --ease: cubic-bezier(.22, 1, .36, 1);
  --font: "Inter", "Manrope", "Segoe UI", system-ui, -apple-system, "Helvetica Neue", Arial, sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

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

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

h1, h2, h3 { margin: 0; line-height: 1.06; letter-spacing: -0.02em; font-weight: 700; }

p { margin: 0; }

.container {
  width: 100%;
  max-width: var(--max);
  margin-inline: auto;
  padding-inline: 24px;
}

/* ---------- grain / background ---------- */
.grain {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 1;
  opacity: .35;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='140' height='140'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='140' height='140' filter='url(%23n)' opacity='0.06'/%3E%3C/svg%3E");
  mix-blend-mode: overlay;
}

body::before {
  content: "";
  position: fixed;
  inset: -20% -10% auto -10%;
  height: 70vh;
  background:
    radial-gradient(50% 60% at 18% 10%, rgba(255, 106, 43, .12), transparent 70%),
    radial-gradient(40% 50% at 82% 0%, rgba(90, 140, 255, .08), transparent 70%);
  pointer-events: none;
  z-index: 0;
}

main, .nav, .footer { position: relative; z-index: 2; }

/* ---------- buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 24px;
  border-radius: 999px;
  font-size: .95rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform .25s var(--ease), background .25s, border-color .25s, color .25s;
  white-space: nowrap;
}
.btn:active { transform: scale(.97); }

.btn--solid {
  background: linear-gradient(135deg, var(--accent), #ff8a45);
  color: #140a04;
  box-shadow: 0 10px 30px -10px rgba(255, 106, 43, .6);
}
.btn--solid:hover {
  transform: translateY(-2px);
  box-shadow: 0 18px 40px -12px rgba(255, 106, 43, .7);
}

.btn--line {
  border-color: var(--line);
  background: rgba(255, 255, 255, .02);
  color: var(--text);
}
.btn--line:hover { border-color: #3a4049; background: rgba(255, 255, 255, .05); }

.btn--ghost {
  padding: 10px 18px;
  border-color: var(--line);
  color: var(--text);
  background: transparent;
}
.btn--ghost:hover { border-color: var(--accent); color: var(--accent-2); }

/* ---------- nav ---------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  transition: background .35s, border-color .35s, backdrop-filter .35s;
  border-bottom: 1px solid transparent;
}
.nav.is-scrolled {
  background: rgba(8, 9, 11, .72);
  backdrop-filter: blur(18px) saturate(140%);
  border-bottom-color: var(--line-soft);
}
.nav__inner {
  display: flex;
  align-items: center;
  gap: 28px;
  height: 72px;
}

.brand { display: inline-flex; align-items: center; gap: 10px; }
.brand__mark {
  display: grid;
  place-items: center;
  width: 34px; height: 34px;
  border-radius: 10px;
  background: linear-gradient(135deg, rgba(255,106,43,.2), rgba(255,106,43,.04));
  border: 1px solid rgba(255,106,43,.35);
  color: var(--accent-2);
}
.brand__text {
  font-weight: 800;
  letter-spacing: .04em;
  font-size: .95rem;
}
.brand__text span { color: var(--accent); }

.nav__links {
  display: flex;
  gap: 26px;
  margin-left: auto;
  font-size: .9rem;
  color: var(--muted);
}
.nav__links a { position: relative; padding: 6px 0; transition: color .2s; }
.nav__links a::after {
  content: "";
  position: absolute;
  left: 0; bottom: 0;
  width: 0; height: 1px;
  background: var(--accent);
  transition: width .3s var(--ease);
}
.nav__links a:hover { color: var(--text); }
.nav__links a:hover::after { width: 100%; }

.nav__cta { margin-left: 8px; }

.nav__burger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 42px; height: 42px;
  background: transparent;
  border: 1px solid var(--line);
  border-radius: 10px;
  cursor: pointer;
}
.nav__burger span {
  display: block;
  height: 2px;
  width: 18px;
  margin-inline: auto;
  background: var(--text);
  transition: transform .3s var(--ease), opacity .2s;
}
.nav__burger[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav__burger[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav__burger[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- hero ---------- */
.hero {
  position: relative;
  padding: 72px 0 0;
  overflow: hidden;
}
.hero__glow {
  position: absolute;
  top: -10%; right: -10%;
  width: 70vw; height: 70vw;
  max-width: 900px; max-height: 900px;
  background: radial-gradient(circle at center, rgba(255,106,43,.16), transparent 62%);
  filter: blur(20px);
  pointer-events: none;
}
.hero__inner {
  display: grid;
  grid-template-columns: 1.02fr .98fr;
  gap: 40px;
  align-items: center;
  min-height: min(78vh, 720px);
  padding-bottom: 40px;
}

.kicker {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: .78rem;
  font-weight: 600;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 22px;
}
.kicker .dot {
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 4px rgba(255,106,43,.14);
}

.hero h1 {
  font-size: clamp(2.6rem, 6.2vw, 5.2rem);
  font-weight: 800;
  letter-spacing: -0.035em;
  margin-bottom: 22px;
}
.grad {
  background: linear-gradient(100deg, var(--accent), var(--accent-2) 60%, #ffe0c2);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.lead {
  max-width: 46ch;
  color: var(--muted);
  font-size: 1.05rem;
}
.lead strong { color: var(--text); font-weight: 600; }

.hero__actions { display: flex; gap: 12px; flex-wrap: wrap; margin: 32px 0 40px; }

.hero__stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  margin: 0;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-sm);
  overflow: hidden;
}
.hero__stats > div {
  background: var(--bg-2);
  padding: 16px 18px;
}
.hero__stats dt {
  font-size: .72rem;
  text-transform: uppercase;
  letter-spacing: .1em;
  color: var(--dim);
  margin-bottom: 4px;
}
.hero__stats dd {
  margin: 0;
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.03em;
}
.hero__stats small { font-size: .7rem; color: var(--muted); margin-left: 3px; letter-spacing: 0; font-weight: 500; }

.hero__visual { position: relative; }
.car {
  width: 100%;
  height: auto;
  filter: drop-shadow(0 40px 60px rgba(0, 0, 0, .6));
  animation: float 7s ease-in-out infinite;
}
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

.hero__badge {
  position: absolute;
  top: 6%; left: 2%;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border-radius: 999px;
  background: rgba(16, 19, 24, .7);
  border: 1px solid var(--line);
  backdrop-filter: blur(10px);
  font-size: .78rem;
  font-weight: 600;
  letter-spacing: .06em;
  color: var(--muted);
}
.pulse {
  width: 7px; height: 7px; border-radius: 50%;
  background: #5ee08a;
  box-shadow: 0 0 0 0 rgba(94,224,138,.5);
  animation: pulse 2s infinite;
}
@keyframes pulse {
  0% { box-shadow: 0 0 0 0 rgba(94,224,138,.5); }
  70% { box-shadow: 0 0 0 8px rgba(94,224,138,0); }
  100% { box-shadow: 0 0 0 0 rgba(94,224,138,0); }
}

/* marquee */
.hero__marquee {
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
  overflow: hidden;
  padding: 16px 0;
  background: linear-gradient(90deg, transparent, rgba(255,106,43,.03), transparent);
}
.marquee {
  display: flex;
  gap: 26px;
  width: max-content;
  font-size: .82rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--dim);
  animation: marquee 34s linear infinite;
}
.marquee span:nth-child(even) { color: var(--accent); }
@keyframes marquee {
  from { transform: translateX(0); }
  to { transform: translateX(-50%); }
}

/* ---------- sections ---------- */
.section { padding: 110px 0; }
.section--tint {
  background:
    linear-gradient(180deg, transparent, rgba(255,255,255,.012) 18%, rgba(255,255,255,.012) 82%, transparent);
  border-block: 1px solid var(--line-soft);
}

.section__head { max-width: 640px; margin-bottom: 56px; }
.section__head h2 {
  font-size: clamp(1.9rem, 3.6vw, 3rem);
  margin-bottom: 16px;
}
.section__head p { color: var(--muted); font-size: 1.02rem; }
.section__head--left { margin-bottom: 40px; }

/* cards */
.cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}
.card {
  position: relative;
  padding: 30px 26px;
  border-radius: var(--radius);
  background: linear-gradient(180deg, var(--panel), var(--bg-2));
  border: 1px solid var(--line-soft);
  overflow: hidden;
  transition: transform .4s var(--ease), border-color .4s;
}
.card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(120% 80% at 100% 0%, rgba(255,106,43,.08), transparent 55%);
  opacity: 0;
  transition: opacity .4s;
}
.card:hover { transform: translateY(-4px); border-color: #2c313a; }
.card:hover::before { opacity: 1; }
.card__icon {
  font-size: .78rem;
  font-weight: 700;
  letter-spacing: .12em;
  color: var(--accent);
  margin-bottom: 20px;
}
.card h3 { font-size: 1.35rem; margin-bottom: 10px; }
.card p { color: var(--muted); font-size: .95rem; }
.ticks { list-style: none; padding: 0; margin: 18px 0 0; display: grid; gap: 8px; }
.ticks li {
  position: relative;
  padding-left: 20px;
  font-size: .88rem;
  color: var(--dim);
}
.ticks li::before {
  content: "";
  position: absolute;
  left: 0; top: .55em;
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--accent-soft);
  border: 1px solid rgba(255,106,43,.5);
}

/* engine */
.engine {
  display: grid;
  grid-template-columns: 1.15fr .85fr;
  gap: 48px;
  align-items: center;
  margin-bottom: 56px;
}
.engine__tags { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 24px; }
.engine__tags span {
  padding: 7px 13px;
  border-radius: 999px;
  border: 1px solid var(--line);
  font-size: .78rem;
  color: var(--muted);
  background: rgba(255,255,255,.02);
}

.gauges {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}
.gauge {
  position: relative;
  padding: 22px 10px 18px;
  text-align: center;
  border-radius: var(--radius);
  background: var(--panel);
  border: 1px solid var(--line-soft);
}
.gauge svg { width: 92px; height: 92px; margin: 0 auto 10px; transform: rotate(-90deg); }
.g-track { fill: none; stroke: #1d222a; stroke-width: 8; }
.g-fill {
  fill: none;
  stroke: var(--accent);
  stroke-width: 8;
  stroke-linecap: round;
  stroke-dasharray: 314;
  stroke-dashoffset: calc(314 - (314 * var(--p) / 100));
  filter: drop-shadow(0 0 6px rgba(255,106,43,.45));
}
.gauge__val {
  font-size: 1.45rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}
.gauge__val small { font-size: .62rem; color: var(--muted); margin-left: 2px; font-weight: 500; }
.gauge__lbl { font-size: .7rem; color: var(--dim); margin-top: 4px; }

/* spec table */
.table-wrap {
  border-radius: var(--radius);
  border: 1px solid var(--line-soft);
  overflow: hidden;
  background: var(--panel);
}
.spec-table { width: 100%; border-collapse: collapse; }
.spec-table caption {
  text-align: left;
  padding: 20px 26px;
  font-weight: 600;
  color: var(--muted);
  font-size: .85rem;
  letter-spacing: .08em;
  text-transform: uppercase;
  border-bottom: 1px solid var(--line-soft);
}
.spec-table th, .spec-table td {
  text-align: left;
  padding: 15px 26px;
  border-bottom: 1px solid var(--line-soft);
  font-size: .95rem;
}
.spec-table tr:last-child th,
.spec-table tr:last-child td { border-bottom: 0; }
.spec-table th { color: var(--dim); font-weight: 500; width: 42%; }
.spec-table td { color: var(--text); }
.spec-table tr:hover td, .spec-table tr:hover th { background: rgba(255,255,255,.018); }

/* stats grid */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
}
.stat {
  padding: 26px 22px;
  border-radius: var(--radius);
  background: linear-gradient(180deg, var(--panel), var(--bg-2));
  border: 1px solid var(--line-soft);
  transition: border-color .3s, transform .3s var(--ease);
}
.stat:hover { border-color: #2c313a; transform: translateY(-3px); }
.stat__num { display: block; font-size: 2.1rem; font-weight: 700; letter-spacing: -0.04em; }
.stat__unit { font-size: .8rem; color: var(--accent-2); margin-left: 4px; }
.stat__lbl { display: block; margin-top: 6px; font-size: .8rem; color: var(--dim); }

/* timeline */
.timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
  counter-reset: step;
}
.timeline li {
  position: relative;
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 24px;
  padding: 24px 26px 24px 34px;
  border-radius: var(--radius);
  background: var(--panel);
  border: 1px solid var(--line-soft);
}
.timeline li::before {
  content: "";
  position: absolute;
  left: 12px;
  top: 30px;
  bottom: 30px;
  width: 2px;
  background: linear-gradient(180deg, var(--accent), transparent);
  opacity: .55;
}
.timeline__km {
  font-weight: 700;
  color: var(--accent-2);
  font-size: .92rem;
  letter-spacing: -0.01em;
}
.timeline h3 { font-size: 1.08rem; margin-bottom: 6px; }
.timeline p { color: var(--muted); font-size: .92rem; }

/* faq */
.faq {
  display: grid;
  grid-template-columns: .8fr 1.2fr;
  gap: 48px;
  align-items: start;
}
.faq__list { display: grid; gap: 10px; }
.faq__item {
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-sm);
  background: var(--panel);
  overflow: hidden;
  transition: border-color .3s;
}
.faq__item[open] { border-color: #2c313a; }
.faq__item summary {
  cursor: pointer;
  list-style: none;
  padding: 18px 22px;
  font-weight: 600;
  font-size: .98rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.faq__item summary::-webkit-details-marker { display: none; }
.faq__item summary::after {
  content: "+";
  font-size: 1.3rem;
  color: var(--accent);
  line-height: 1;
  transition: transform .3s var(--ease);
}
.faq__item[open] summary::after { transform: rotate(45deg); }
.faq__body { padding: 0 22px 20px; color: var(--muted); font-size: .93rem; }

/* contacts */
.contacts {
  display: grid;
  grid-template-columns: .9fr 1.1fr;
  gap: 48px;
  align-items: start;
}
.contacts__meta { display: grid; gap: 8px; margin-top: 26px; font-size: .95rem; }
.contacts__meta a { color: var(--accent-2); font-weight: 600; }
.contacts__meta span { color: var(--dim); font-size: .88rem; }

.form {
  padding: 28px;
  border-radius: var(--radius);
  background: linear-gradient(180deg, var(--panel), var(--bg-2));
  border: 1px solid var(--line-soft);
  display: grid;
  gap: 16px;
}
.field { display: grid; gap: 7px; }
.field label { font-size: .78rem; color: var(--dim); letter-spacing: .06em; text-transform: uppercase; }
.field input, .field textarea {
  width: 100%;
  padding: 13px 16px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line);
  background: #0a0c0f;
  color: var(--text);
  font: inherit;
  font-size: .95rem;
  transition: border-color .25s, box-shadow .25s;
  resize: vertical;
}
.field input::placeholder, .field textarea::placeholder { color: #5a636e; }
.field input:focus, .field textarea:focus {
  outline: none;
  border-color: rgba(255,106,43,.6);
  box-shadow: 0 0 0 3px rgba(255,106,43,.12);
}
.form .btn { justify-self: start; margin-top: 4px; }
.form__note { font-size: .85rem; color: #5ee08a; min-height: 1.2em; }
.form__note.is-error { color: #ff7a6a; }

/* footer */
.footer {
  border-top: 1px solid var(--line-soft);
  padding: 44px 0;
  background: var(--bg-2);
}
.footer__inner {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 28px;
  align-items: center;
}
.brand--footer .brand__text { font-size: .85rem; }
.footer__note { color: var(--dim); font-size: .78rem; max-width: 58ch; }
.footer__links { display: flex; gap: 20px; font-size: .84rem; color: var(--muted); }
.footer__links a:hover { color: var(--text); }

/* reveal */
.reveal {
  opacity: 0;
  transform: translateY(26px);
  transition: opacity .8s var(--ease), transform .8s var(--ease);
  will-change: opacity, transform;
}
.reveal.is-in { opacity: 1; transform: none; }

/* ---------- responsive ---------- */
@media (max-width: 1024px) {
  .hero__inner { grid-template-columns: 1fr; min-height: 0; gap: 24px; }
  .hero__visual { order: -1; max-width: 760px; }
  .hero { padding-top: 40px; }
  .engine { grid-template-columns: 1fr; gap: 32px; }
  .faq { grid-template-columns: 1fr; gap: 32px; }
  .contacts { grid-template-columns: 1fr; gap: 32px; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .footer__inner { grid-template-columns: 1fr; gap: 18px; }
}

@media (max-width: 820px) {
  .nav__links {
    position: fixed;
    inset: 72px 0 auto;
    flex-direction: column;
    gap: 4px;
    padding: 18px 24px 26px;
    background: rgba(8,9,11,.96);
    backdrop-filter: blur(18px);
    border-bottom: 1px solid var(--line-soft);
    transform: translateY(-8px);
    opacity: 0;
    pointer-events: none;
    transition: opacity .25s, transform .25s;
  }
  .nav__links.is-open { opacity: 1; transform: none; pointer-events: auto; }
  .nav__links a { padding: 12px 0; font-size: 1rem; }
  .nav__cta { display: none; }
  .nav__burger { display: flex; margin-left: auto; }

  .cards { grid-template-columns: 1fr; }
  .gauges { grid-template-columns: repeat(3, 1fr); }
  .hero__stats { grid-template-columns: repeat(2, 1fr); }
  .timeline li { grid-template-columns: 1fr; gap: 8px; padding-left: 26px; }
  .section { padding: 76px 0; }
}

@media (max-width: 520px) {
  .container { padding-inline: 18px; }
  .gauges { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: 1fr; }
  .hero__stats { grid-template-columns: 1fr 1fr; }
  .hero__actions .btn { flex: 1; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .001ms !important; transition-duration: .001ms !important; }
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; }
}