:root {
  --ink: #12151a;
  --ink-soft: #4a5560;
  --paper: #eef1f3;
  --asphalt: #15181c;
  --nitro: #ff2e00;
  --nitro-deep: #c82400;
  --leaf: #1f6b45;
  --haze: rgba(238, 241, 243, 0.9);
  --font-display: "Oswald", "Be Vietnam Pro", sans-serif;
  --font-body: "Be Vietnam Pro", sans-serif;
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --space: clamp(1.25rem, 3vw, 2.5rem);
  --max: 72rem;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(120% 80% at 8% -8%, rgba(31, 107, 69, 0.14), transparent 52%),
    radial-gradient(90% 55% at 100% 0%, rgba(255, 46, 0, 0.08), transparent 48%),
    linear-gradient(180deg, #f5f7f8 0%, var(--paper) 45%, #e5eaee 100%);
  font-family: var(--font-body);
  font-weight: 400;
  line-height: 1.55;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

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

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

.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.85rem var(--space);
  background: rgba(231, 235, 239, 0.92);
  border-bottom: 1px solid rgba(18, 21, 26, 0.08);
  color: var(--ink);
  backdrop-filter: blur(10px);
}

.logo {
  display: flex;
  align-items: baseline;
  gap: 0.55rem;
  letter-spacing: 0.04em;
}

.logo-mark {
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--nitro);
}

.logo-text {
  font-family: var(--font-display);
  font-size: 0.95rem;
  font-weight: 500;
  text-transform: uppercase;
  opacity: 0.92;
}

.hero {
  position: relative;
  min-height: 100svh;
  display: grid;
  align-items: end;
  color: var(--paper);
  overflow: hidden;
}

.hero-media {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero-photo {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: 50% 40%;
  transform: scale(1.08);
  animation: hero-drift 18s var(--ease-out) infinite alternate;
}

.hero-wash {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(18, 21, 26, 0.4) 0%, rgba(18, 21, 26, 0.12) 35%, rgba(18, 21, 26, 0.82) 100%),
    linear-gradient(90deg, rgba(18, 21, 26, 0.58) 0%, transparent 55%);
}

.hero-content {
  position: relative;
  z-index: 1;
  width: min(100%, var(--max));
  margin: 0 auto;
  padding: clamp(5.5rem, 12vw, 8rem) var(--space) clamp(3rem, 8vw, 5rem);
}

.brand {
  margin: 0 0 0.85rem;
  font-family: var(--font-display);
  font-size: clamp(2.6rem, 8vw, 5.4rem);
  font-weight: 700;
  line-height: 0.92;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  text-wrap: balance;
}

.hero h1 {
  margin: 0 0 1rem;
  max-width: 14ch;
  font-size: clamp(1.35rem, 3.2vw, 2rem);
  font-weight: 600;
  line-height: 1.25;
  letter-spacing: -0.01em;
}

.lede {
  margin: 0 0 1.75rem;
  max-width: 34rem;
  font-size: clamp(1rem, 2vw, 1.15rem);
  color: rgba(238, 241, 243, 0.9);
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.85rem;
  padding: 0.7rem 1.35rem;
  border: 1px solid transparent;
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 600;
  transition:
    background-color 200ms ease,
    color 200ms ease,
    border-color 200ms ease,
    transform 200ms var(--ease-out);
}

.btn:hover,
.btn:focus-visible {
  transform: translateY(-1px);
}

.btn-primary {
  background: var(--nitro);
  color: #fff;
}

.btn-primary:hover,
.btn-primary:focus-visible {
  background: var(--nitro-deep);
}

.btn-ghost {
  border-color: rgba(238, 241, 243, 0.45);
  color: var(--paper);
  background: transparent;
}

.btn-ghost:hover,
.btn-ghost:focus-visible {
  border-color: var(--paper);
  background: rgba(238, 241, 243, 0.08);
}

.reveal {
  opacity: 0;
  transform: translateY(1.1rem);
  animation: rise 900ms var(--ease-out) forwards;
}

.delay-1 {
  animation-delay: 120ms;
}

.delay-2 {
  animation-delay: 240ms;
}

.delay-3 {
  animation-delay: 360ms;
}

.scale-section {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  min-height: min(88svh, 46rem);
  background: var(--paper);
}

.scale-section.invert {
  grid-template-columns: 0.85fr 1.15fr;
  background: var(--asphalt);
  color: var(--paper);
}

.scale-section.invert .scale-visual {
  order: 2;
}

.scale-visual {
  position: relative;
  overflow: hidden;
  min-height: 18rem;
}

.scale-visual img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transform: scale(1.04);
  transition: transform 1.2s var(--ease-out);
}

.scale-section.in-view .scale-visual img {
  transform: scale(1);
}

.scale-copy {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: clamp(2rem, 6vw, 4.5rem);
}

.scale-label {
  margin: 0 0 0.5rem;
  font-family: var(--font-display);
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--nitro);
}

.scale-section h2 {
  margin: 0 0 1rem;
  font-family: var(--font-display);
  font-size: clamp(2.4rem, 6vw, 4.2rem);
  font-weight: 700;
  line-height: 0.95;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

.scale-copy p:not(.scale-label):not(.speed-stat) {
  margin: 0;
  max-width: 32rem;
  color: var(--ink-soft);
  font-size: 1.05rem;
}

.scale-section.invert .scale-copy p:last-child {
  color: rgba(238, 241, 243, 0.82);
}

.starters {
  padding: clamp(3.5rem, 9vw, 6rem) var(--space);
  background: #e7ebef;
}

.starters-first {
  min-height: 100svh;
  padding-top: clamp(4.5rem, 10vw, 6rem);
  padding-bottom: clamp(2.5rem, 6vw, 4rem);
}

.starters-intro {
  width: min(100%, 46rem);
  margin: 0 auto 2rem;
  text-align: center;
}

.brand-inline {
  margin: 0 0 0.55rem;
  font-family: var(--font-display);
  font-size: clamp(2.6rem, 8vw, 5rem);
  font-weight: 700;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  line-height: 0.92;
  color: var(--ink);
  text-wrap: balance;
}

.starters-offer {
  margin: 0 0 1.35rem;
  font-size: clamp(1rem, 2.2vw, 1.2rem);
  font-weight: 600;
  letter-spacing: 0.01em;
  color: var(--ink-soft);
}

.pitch-points {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.75rem;
  width: min(100%, 36rem);
  margin: 0 auto 1rem;
  padding: 0;
  list-style: none;
}

.pitch-points li {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  padding: 0.85rem 0.65rem;
  border-top: 3px solid var(--nitro);
  background: rgba(255, 255, 255, 0.55);
  text-align: center;
}

.pitch-label {
  font-family: var(--font-display);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

.pitch-points strong {
  font-family: var(--font-display);
  font-size: clamp(1.05rem, 2.4vw, 1.35rem);
  font-weight: 700;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  line-height: 1.15;
  color: var(--ink);
}

.starter-kit {
  width: min(100%, 40rem);
  margin: 2.25rem auto 0;
}

.starter-kit-label {
  margin: 0 0 0.65rem;
  font-family: var(--font-display);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--nitro);
  text-align: center;
}

.starter-kit .combo-includes {
  margin: 0 auto;
  max-width: 36rem;
}

.starter-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(1rem, 3vw, 1.75rem);
  width: min(100%, var(--max));
  margin: 0 auto;
}

.starter-pack {
  display: grid;
  grid-template-rows: auto 1fr;
  background: var(--paper);
}

.starter-visual {
  overflow: hidden;
  aspect-ratio: 1 / 1;
  background: #fff;
}

.starter-visual img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  object-position: center;
}

.starter-visual-buggy img {
  object-fit: contain;
  transform: scale(1.08);
}

.starter-visual-onroad img {
  object-fit: contain;
  transform: scale(1.02);
}

.starter-visual-plain {
  display: grid;
  place-content: center;
  gap: 0.35rem;
  text-align: center;
  background:
    linear-gradient(145deg, #1b1f24 0%, #2a3138 55%, #1b1f24 100%);
  color: var(--paper);
}

.model-code {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 4vw, 2.4rem);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--nitro);
}

.model-name {
  margin: 0;
  font-size: 1rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  opacity: 0.85;
}

.starter-copy {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.75rem;
  padding: clamp(1.35rem, 3vw, 1.85rem);
}

.starter-copy h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.55rem, 3vw, 2rem);
  font-weight: 700;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  line-height: 1;
}

.starter-copy p:not(.scale-label):not(.speed-stat) {
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.98rem;
}

.speed-stat {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.15rem, 2.4vw, 1.45rem);
  font-weight: 600;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  color: var(--nitro);
  line-height: 1.2;
}

.speed-stat strong {
  font-weight: 700;
}

.speed-stat-dark {
  margin: 0 0 1rem;
}

.combo-includes {
  margin: 0 0 1.75rem;
  padding: 0;
  list-style: none;
  max-width: 28rem;
}

.combo-includes li {
  position: relative;
  padding: 0.55rem 0 0.55rem 1.15rem;
  border-top: 1px solid rgba(18, 21, 26, 0.1);
  color: var(--ink);
  font-size: 0.98rem;
  font-weight: 500;
}

.combo-includes li:last-child {
  border-bottom: 1px solid rgba(18, 21, 26, 0.1);
}

.combo-includes li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 1.05rem;
  width: 0.4rem;
  height: 0.4rem;
  background: var(--nitro);
}

.roadmap {
  padding: clamp(3.5rem, 9vw, 6.5rem) var(--space);
  background: var(--asphalt);
  color: var(--paper);
  overflow: hidden;
}

.roadmap-intro {
  width: min(100%, 40rem);
  margin: 0 auto 3rem;
  text-align: center;
}

.roadmap-intro h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(2rem, 5vw, 3.4rem);
  font-weight: 700;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  line-height: 1;
}

.rank-path {
  position: relative;
  width: min(100%, var(--max));
  margin: 0 auto;
  padding: 2.5rem 0 1rem;
}

.rank-path-track {
  position: absolute;
  left: 6%;
  right: 6%;
  top: calc(2.5rem + 1.05rem);
  height: 3px;
  border-radius: 999px;
  background: rgba(238, 241, 243, 0.14);
  overflow: hidden;
}

.rank-path-progress {
  width: 0;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(
    90deg,
    #cd7f32 0%,
    #c0c7d1 28%,
    #efc75b 55%,
    #7ec8ff 78%,
    var(--nitro) 100%
  );
  transform-origin: left center;
}

.rank-path-spark {
  position: absolute;
  top: 50%;
  left: 0;
  width: 0.85rem;
  height: 0.85rem;
  border-radius: 50%;
  background: #fff;
  box-shadow:
    0 0 0 3px rgba(255, 46, 0, 0.35),
    0 0 18px 4px rgba(255, 46, 0, 0.55);
  transform: translate(-50%, -50%);
  opacity: 0;
}

.rank-path-nodes {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  margin: 0;
  padding: 0;
  list-style: none;
}

.rank-node {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.85rem;
  opacity: 0;
  transform: translateY(1rem) scale(0.92);
}

.rank-node-dot {
  width: 1.35rem;
  height: 1.35rem;
  border-radius: 50%;
  border: 2px solid currentColor;
  background: var(--asphalt);
  box-shadow: 0 0 0 0 transparent;
}

.rank-node-name {
  font-family: var(--font-display);
  font-size: clamp(0.95rem, 2vw, 1.2rem);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  text-align: center;
}

.rank-dong {
  color: #cd7f32;
}

.rank-bac {
  color: #c0c7d1;
}

.rank-vang {
  color: #efc75b;
}

.rank-kim {
  color: #7ec8ff;
}

.rank-goal,
.rank-thach {
  color: var(--nitro);
}

.roadmap.in-view .rank-path-progress {
  animation: path-fill 2.4s var(--ease-out) 0.15s forwards;
}

.roadmap.in-view .rank-path-spark {
  opacity: 1;
  animation: path-spark 2.4s var(--ease-out) 0.15s forwards;
}

.roadmap.in-view .rank-node {
  animation: node-pop 0.7s var(--ease-out) forwards;
  animation-delay: calc(0.25s + var(--i) * 0.35s);
}

.roadmap.in-view .rank-node-dot {
  animation: node-pulse 1.8s ease-in-out infinite;
  animation-delay: calc(1.6s + var(--i) * 0.2s);
}

@keyframes path-fill {
  from {
    width: 0;
  }
  to {
    width: 100%;
  }
}

@keyframes path-spark {
  from {
    left: 0;
    opacity: 0;
  }
  12% {
    opacity: 1;
  }
  to {
    left: 100%;
    opacity: 1;
  }
}

@keyframes node-pop {
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

@keyframes node-pulse {
  0%,
  100% {
    box-shadow: 0 0 0 0 transparent;
  }
  50% {
    box-shadow: 0 0 0 8px color-mix(in srgb, currentColor 22%, transparent);
  }
}

.why,
.contact {
  width: min(100%, 42rem);
  margin: 0 auto;
  padding: clamp(4rem, 10vw, 7rem) var(--space);
  text-align: center;
}

.why h2,
.contact h2 {
  margin: 0 0 1rem;
  font-family: var(--font-display);
  font-size: clamp(2rem, 5vw, 3.2rem);
  font-weight: 700;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  line-height: 1;
}

.why p,
.contact p {
  margin: 0 auto 0;
  color: var(--ink-soft);
  font-size: 1.05rem;
}

.contact .btn-primary {
  min-width: 11rem;
  margin-top: 0.5rem;
}

@keyframes rise {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes hero-drift {
  from {
    transform: scale(1.08) translate3d(0, 0, 0);
  }
  to {
    transform: scale(1.14) translate3d(-1.5%, -1%, 0);
  }
}

@media (max-width: 860px) {
  .scale-section,
  .scale-section.invert {
    grid-template-columns: 1fr;
    min-height: auto;
  }

  .scale-section.invert .scale-visual {
    order: 0;
  }

  .scale-visual {
    min-height: 14rem;
    aspect-ratio: 16 / 10;
  }

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

  .pitch-points {
    grid-template-columns: 1fr;
    width: min(100%, 22rem);
  }

  .rank-path {
    padding: 1rem 0;
  }

  .rank-path-track {
    display: none;
  }

  .rank-path-nodes {
    grid-template-columns: 1fr;
    gap: 0.85rem;
  }

  .rank-node {
    flex-direction: row;
    justify-content: flex-start;
    gap: 0.85rem;
    padding-left: 0.25rem;
  }
}

@media (max-width: 560px) {
  .brand {
    font-size: clamp(2.2rem, 12vw, 3.2rem);
  }

  .cta-row {
    width: 100%;
  }

  .btn {
    flex: 1 1 auto;
  }
}

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

  .reveal,
  .hero-photo,
  .scale-visual img,
  .rank-path-progress,
  .rank-path-spark,
  .rank-node,
  .rank-node-dot {
    animation: none !important;
    transition: none !important;
    opacity: 1;
    transform: none;
  }

  .rank-path-progress {
    width: 100%;
  }

  .rank-path-spark {
    left: 100%;
    opacity: 1;
  }
}