:root {
  --bg: #0c0c0c;
  --surface: #141414;
  --surface-2: #1a1a1a;
  --text: #ededed;
  --muted: #8a8a8a;
  --faint: #5a5a5a;
  --line: rgba(255, 255, 255, 0.08);
  --font: "Inter", system-ui, sans-serif;
  --pixel: "Press Start 2P", monospace;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.55;
  min-height: 100vh;
}

.letter-field {
  position: fixed;
  inset: 0;
  z-index: 0;
  overflow: hidden;
  pointer-events: none;
}

.letter-drop {
  position: absolute;
  top: -8vh;
  font-family: var(--pixel);
  color: var(--text);
  line-height: 1;
  user-select: none;
  -webkit-user-select: none;
  opacity: var(--drop-opacity, 0.5);
  animation: drop-float var(--drop-duration, 22s) linear infinite;
  animation-delay: var(--drop-delay, 0s);
  transition: opacity 0.18s linear;
}

.letter-drop.is-swap {
  opacity: 0;
}

@keyframes drop-float {
  0% {
    transform: translate3d(0, 0, 0);
  }
  50% {
    transform: translate3d(var(--drop-drift, 24px), 55vh, 0);
  }
  100% {
    transform: translate3d(calc(var(--drop-drift, 24px) * -0.4), 110vh, 0);
  }
}

@media (prefers-reduced-motion: reduce) {
  .letter-field {
    display: none;
  }
}

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

main,
.footer {
  position: relative;
  z-index: 1;
}

.header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 18px 40px;
  border-bottom: 1px solid var(--line);
  background: var(--bg);
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
}

.logo-icon {
  width: 18px;
  height: 18px;
  color: var(--text);
  flex-shrink: 0;
}

.logo-text {
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.logo-mark {
  font-weight: 600;
  letter-spacing: 0.04em;
}

.logo-sub {
  color: var(--muted);
  font-size: 12px;
  letter-spacing: 0.08em;
}

.header-right {
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav {
  display: flex;
  gap: 28px;
  font-size: 14px;
  color: var(--muted);
}

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 8px 14px;
  background: var(--text);
  color: var(--bg);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  border-radius: 8px;
}

.btn:hover {
  color: var(--bg);
  background: #ffffff;
}

.btn-start {
  margin-top: 24px;
  padding: 12px 28px;
  font-size: 13px;
}

.hero {
  max-width: 820px;
  margin: 0 auto;
  padding: 88px 24px 72px;
  text-align: center;
}

.pixel-label {
  font-family: var(--pixel);
  font-size: 13px;
  letter-spacing: 0.18em;
  color: var(--faint);
  user-select: none;
  -webkit-user-select: none;
  pointer-events: none;
  margin-bottom: 28px;
}

.hero h1 {
  font-size: clamp(32px, 5vw, 52px);
  font-weight: 500;
  letter-spacing: -0.04em;
  line-height: 1.12;
}

.hero-lead {
  margin: 22px auto 0;
  max-width: 640px;
  color: var(--muted);
  font-size: 17px;
}

.dialog {
  margin: 48px auto 0;
  max-width: 680px;
  text-align: left;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 12px;
}

.dialog-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  border-bottom: 1px solid var(--line);
  font-size: 12px;
}

.dialog-brand {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.dialog-icon {
  width: 16px;
  height: 16px;
  color: var(--text);
  flex-shrink: 0;
}

.dialog-name {
  font-weight: 600;
  letter-spacing: 0.06em;
}

.dialog-meta {
  color: var(--faint);
}

.dialog-text {
  position: relative;
  padding: 20px 16px 24px;
  color: #c4c4c4;
  font-size: 15px;
  line-height: 1.65;
}

.dialog-sizer {
  display: block;
  visibility: hidden;
  pointer-events: none;
}

.dialog-typed {
  position: absolute;
  inset: 20px 16px 24px;
}

.caret {
  display: inline-block;
  width: 7px;
  height: 1em;
  margin-left: 2px;
  background: var(--text);
  vertical-align: text-bottom;
  animation: blink 1s steps(1) infinite;
}

.caret.is-done {
  opacity: 0.35;
}

@keyframes blink {
  50% {
    opacity: 0;
  }
}

.section {
  max-width: 1080px;
  margin: 0 auto;
  padding: 88px 40px;
  border-top: 1px solid var(--line);
  scroll-margin-top: 72px;
}

.section-kicker {
  color: var(--faint);
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: 20px;
}

.section h2,
.section-title {
  font-size: clamp(26px, 3.4vw, 36px);
  font-weight: 500;
  letter-spacing: -0.03em;
  line-height: 1.2;
}

.about-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 48px;
  align-items: start;
}

.about-copy {
  color: var(--muted);
  display: flex;
  flex-direction: column;
  gap: 16px;
  font-size: 16px;
}

.advantages {
  list-style: none;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
  margin-top: 40px;
  border-top: 1px solid var(--line);
}

.advantages li {
  padding: 28px 32px 28px 0;
  border-bottom: 1px solid var(--line);
}

.advantages li:nth-child(odd) {
  padding-right: 40px;
  border-right: 1px solid var(--line);
}

.advantages li:nth-child(even) {
  padding-left: 40px;
}

.adv-num {
  display: block;
  color: var(--faint);
  font-size: 12px;
  letter-spacing: 0.08em;
  margin-bottom: 12px;
}

.advantages h3 {
  font-size: 18px;
  font-weight: 500;
  margin-bottom: 8px;
}

.advantages p {
  color: var(--muted);
  font-size: 15px;
}

.preview-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  gap: 48px;
  align-items: center;
}

.preview-copy {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.preview-copy p {
  color: var(--muted);
  font-size: 16px;
}

.preview-frame {
  margin: 0;
  background: var(--surface);
  border-radius: 12px;
  overflow: hidden;
}

.preview-frame img {
  display: block;
  width: 100%;
  height: auto;
}

.faq-list {
  margin-top: 40px;
  border-top: 1px solid var(--line);
}

.faq-list details {
  padding: 22px 0;
  border-bottom: 1px solid var(--line);
}

.faq-list summary {
  cursor: pointer;
  list-style: none;
  font-size: 18px;
  font-weight: 500;
}

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

.faq-list summary::after {
  content: "+";
  float: right;
  color: var(--faint);
  font-weight: 400;
}

.faq-list details[open] summary::after {
  content: "–";
}

.faq-list p {
  margin-top: 10px;
  max-width: 64ch;
  color: var(--muted);
  font-size: 15px;
}

.footer {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 22px 40px;
  border-top: 1px solid var(--line);
  color: var(--faint);
  font-size: 13px;
}

@media (max-width: 840px) {
  .header,
  .section,
  .footer {
    padding-left: 20px;
    padding-right: 20px;
  }

  .nav {
    display: none;
  }

  .about-grid,
  .preview-grid,
  .advantages {
    grid-template-columns: 1fr;
  }

  .advantages li,
  .advantages li:nth-child(odd),
  .advantages li:nth-child(even) {
    padding: 24px 0;
    border-right: 0;
  }
}