:root {
  --bg: #121212;
  --surface: #181818;
  --surface-2: #1f1f1f;
  --surface-3: #252525;
  --text: #ffffff;
  --muted: #b3b3b3;
  --soft: #cbcbcb;
  --green: #1ed760;
  --green-strong: #1db954;
  --border: #4d4d4d;
  --shadow-heavy: rgba(0, 0, 0, 0.5) 0 8px 24px;
  --shadow-medium: rgba(0, 0, 0, 0.3) 0 8px 8px;
  font-family:
    "CircularSp", "SpotifyMixUI", "Helvetica Neue", helvetica, arial,
    "Apple SD Gothic Neo", "Noto Sans KR", "Hiragino Sans", Meiryo, sans-serif;
  color: var(--text);
  background: var(--bg);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: 320px;
  background:
    radial-gradient(circle at 78% 12%, rgba(30, 215, 96, 0.12), transparent 28%),
    linear-gradient(180deg, #1b1b1b 0%, var(--bg) 34%, #0d0d0d 100%);
}

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

.site-header {
  position: fixed;
  z-index: 20;
  top: 0;
  left: 0;
  right: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 72px;
  padding: 16px clamp(20px, 4vw, 56px);
  background: rgba(18, 18, 18, 0.72);
  backdrop-filter: blur(18px);
}

.brand {
  font-size: 22px;
  font-weight: 800;
  letter-spacing: 0;
}

.brand::before {
  content: "";
  display: inline-block;
  width: 12px;
  height: 12px;
  margin-right: 10px;
  border-radius: 50%;
  background: var(--green);
  vertical-align: 1px;
}

.nav-links {
  display: flex;
  gap: clamp(14px, 2vw, 24px);
  font-size: 14px;
}

.nav-links a {
  color: var(--muted);
  font-weight: 700;
  transition: color 160ms ease, transform 160ms ease;
}

.nav-links a:hover,
.nav-links a:focus-visible {
  color: var(--text);
  transform: translateY(-1px);
}

.hero {
  position: relative;
  min-height: 100svh;
  overflow: hidden;
  display: grid;
  align-items: end;
  padding: 112px clamp(20px, 6vw, 76px) 56px;
  background:
    linear-gradient(90deg, rgba(18, 18, 18, 0.96) 0%, rgba(18, 18, 18, 0.82) 42%, rgba(18, 18, 18, 0.18) 100%),
    radial-gradient(circle at 82% 42%, rgba(30, 215, 96, 0.2), transparent 30%),
    #121212;
}

.hero-copy {
  position: relative;
  z-index: 3;
  width: min(720px, 100%);
}

.eyebrow,
.section-kicker {
  margin: 0 0 16px;
  color: var(--green);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 1.7px;
  text-transform: uppercase;
}

.hero h1 {
  margin: 0;
  font-size: clamp(76px, 16vw, 190px);
  line-height: 0.88;
  letter-spacing: 0;
}

.hero-lede {
  max-width: 610px;
  margin: 26px 0 0;
  color: var(--soft);
  font-size: clamp(22px, 3vw, 36px);
  line-height: 1.22;
  font-weight: 700;
  word-break: keep-all;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 34px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 24px;
  border: 0;
  border-radius: 9999px;
  font-size: 14px;
  font-weight: 800;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  transition:
    transform 160ms ease,
    background-color 160ms ease,
    color 160ms ease,
    box-shadow 160ms ease;
}

.button:hover,
.button:focus-visible {
  transform: scale(1.04);
}

.button.primary {
  background: var(--green);
  color: #000000;
  box-shadow: var(--shadow-medium);
}

.button.secondary {
  background: var(--surface-2);
  color: var(--text);
  box-shadow: inset #7c7c7c 0 0 0 1px;
}

.hero-visual {
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
}

.phone-shot {
  position: absolute;
  margin: 0;
  width: clamp(168px, 18vw, 300px);
  aspect-ratio: 576 / 1280;
  overflow: hidden;
  border-radius: 26px;
  background: var(--surface);
  box-shadow: inset #7c7c7c 0 0 0 1px, var(--shadow-heavy);
  animation: float-room 9s ease-in-out infinite;
}

.phone-shot img,
.showcase img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.phone-a {
  top: 10%;
  right: 31%;
  rotate: -7deg;
}

.phone-b {
  right: 16%;
  bottom: 7%;
  rotate: 6deg;
  animation-delay: -2s;
}

.phone-c {
  top: 13%;
  right: 3%;
  rotate: 11deg;
  animation-delay: -4s;
}

.intro,
.product,
.experience,
.creator,
.roadmap,
.final-cta {
  padding: clamp(68px, 9vw, 120px) clamp(20px, 6vw, 76px);
}

.intro {
  display: grid;
  grid-template-columns: minmax(260px, 0.9fr) minmax(280px, 1.1fr);
  gap: clamp(28px, 7vw, 84px);
  align-items: start;
  background: var(--bg);
  border-bottom: 1px solid rgba(179, 179, 179, 0.12);
}

h2 {
  margin: 0;
  max-width: 860px;
  font-size: clamp(34px, 5.4vw, 72px);
  line-height: 1.04;
  letter-spacing: 0;
  word-break: keep-all;
}

.intro > p,
.creator-copy p {
  margin: 0;
  max-width: 680px;
  color: var(--soft);
  font-size: clamp(18px, 2vw, 24px);
  line-height: 1.45;
  font-weight: 600;
  word-break: keep-all;
}

.section-heading {
  display: grid;
  gap: 14px;
  margin-bottom: clamp(32px, 5vw, 64px);
}

.product {
  background: #0d0d0d;
}

.showcase {
  display: grid;
  grid-template-columns: minmax(280px, 0.9fr) minmax(280px, 1.1fr);
  gap: 18px;
  align-items: stretch;
}

.showcase figure {
  margin: 0;
  overflow: hidden;
  border-radius: 8px;
  background: var(--surface);
  box-shadow: var(--shadow-heavy);
}

.showcase-main {
  max-height: 860px;
}

.showcase-stack {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.showcase-stack figure {
  max-height: 720px;
}

.experience {
  background: linear-gradient(180deg, #121212 0%, #161616 100%);
}

.feature-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.feature-row article {
  min-height: 300px;
  padding: clamp(22px, 3vw, 34px);
  border-radius: 8px;
  background: var(--surface);
  box-shadow: var(--shadow-medium);
  transition: background-color 160ms ease, transform 160ms ease;
}

.feature-row article:hover {
  background: var(--surface-3);
  transform: translateY(-3px);
}

.feature-number {
  display: grid;
  place-items: center;
  width: 46px;
  height: 46px;
  margin-bottom: 52px;
  border-radius: 50%;
  background: var(--green);
  color: #000000;
  font-size: 13px;
  font-weight: 900;
}

h3 {
  margin: 0 0 14px;
  font-size: clamp(24px, 2.6vw, 34px);
  line-height: 1.12;
  word-break: keep-all;
}

.feature-row p,
.timeline span {
  margin: 0;
  color: var(--muted);
  font-size: 16px;
  line-height: 1.5;
  word-break: keep-all;
}

.creator {
  display: grid;
  grid-template-columns: minmax(280px, 0.8fr) minmax(320px, 1.2fr);
  gap: clamp(34px, 7vw, 92px);
  align-items: center;
  background: #0d0d0d;
}

.editor-preview {
  position: relative;
  min-height: 520px;
  overflow: hidden;
  border-radius: 8px;
  background:
    linear-gradient(rgba(255, 255, 255, 0.05) 1px, transparent 1px) 0 0 / 34px 34px,
    linear-gradient(90deg, rgba(255, 255, 255, 0.05) 1px, transparent 1px) 0 0 / 34px 34px,
    var(--surface);
  box-shadow: var(--shadow-heavy);
}

.editor-topbar {
  display: flex;
  align-items: center;
  gap: 9px;
  height: 48px;
  padding: 0 18px;
  background: var(--surface-2);
}

.editor-topbar span {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--border);
}

.node {
  position: absolute;
  display: grid;
  place-items: center;
  min-width: 142px;
  min-height: 74px;
  padding: 18px;
  border-radius: 8px;
  background: var(--surface-2);
  color: var(--text);
  font-weight: 800;
  box-shadow: inset #7c7c7c 0 0 0 1px, var(--shadow-medium);
}

.node::after {
  content: "";
  position: absolute;
  right: -84px;
  top: 50%;
  width: 84px;
  height: 2px;
  background: rgba(30, 215, 96, 0.48);
}

.node.start {
  top: 118px;
  left: 8%;
}

.node.choice {
  top: 210px;
  left: 38%;
  color: #000000;
  background: var(--green);
  box-shadow: var(--shadow-heavy);
}

.node.result {
  right: 8%;
  top: 122px;
}

.node.ai {
  right: 18%;
  bottom: 88px;
  color: #000000;
  background: #eeeeee;
}

.node.result::after,
.node.ai::after {
  display: none;
}

.roadmap {
  background: var(--bg);
}

.timeline {
  list-style: none;
  padding: 0;
  margin: 0;
  border-top: 1px solid rgba(179, 179, 179, 0.12);
}

.timeline li {
  display: grid;
  grid-template-columns: 160px minmax(160px, 0.45fr) minmax(240px, 1fr);
  gap: clamp(16px, 4vw, 42px);
  align-items: baseline;
  padding: 24px 0;
  border-bottom: 1px solid rgba(179, 179, 179, 0.12);
}

.timeline time {
  color: var(--green);
  font-weight: 900;
}

.timeline strong {
  font-size: clamp(22px, 3vw, 34px);
}

.final-cta {
  min-height: 70svh;
  display: grid;
  align-content: center;
  justify-items: start;
  gap: 26px;
  background:
    radial-gradient(circle at 18% 20%, rgba(30, 215, 96, 0.16), transparent 30%),
    #0d0d0d;
}

.final-cta h2 {
  max-width: 900px;
}

.reveal {
  opacity: 1;
  transform: none;
  transition: transform 700ms ease;
}

.reveal.is-visible {
  transform: translateY(0);
}

@keyframes float-room {
  0%,
  100% {
    translate: 0 0;
  }
  50% {
    translate: 0 -18px;
  }
}

@media (max-width: 900px) {
  .site-header {
    min-height: 64px;
    padding: 14px 20px;
  }

  .nav-links {
    gap: 16px;
    font-size: 13px;
  }

  .hero {
    min-height: 94svh;
    padding-top: 92px;
    background:
      linear-gradient(180deg, rgba(18, 18, 18, 0.24), rgba(18, 18, 18, 0.94)),
      #121212;
  }

  .phone-a {
    top: 14%;
    right: 38%;
  }

  .phone-b {
    right: 7%;
    bottom: 33%;
  }

  .phone-c {
    top: 21%;
    right: -16%;
  }

  .intro,
  .showcase,
  .creator {
    grid-template-columns: 1fr;
  }

  .showcase-stack {
    grid-template-columns: 1fr 1fr;
  }

  .feature-row {
    grid-template-columns: 1fr;
  }

  .feature-row article {
    min-height: auto;
  }

  .feature-number {
    margin-bottom: 28px;
  }

  .editor-preview {
    min-height: 460px;
  }

  .timeline li {
    grid-template-columns: 1fr;
    gap: 8px;
  }
}

@media (max-width: 560px) {
  .nav-links {
    display: none;
  }

  .hero h1 {
    font-size: clamp(68px, 22vw, 104px);
  }

  .hero-lede {
    font-size: 21px;
  }

  .button {
    width: 100%;
  }

  .phone-shot {
    width: 150px;
  }

  .phone-a {
    top: 14%;
    right: 38%;
  }

  .phone-b {
    display: none;
  }

  .phone-c {
    display: none;
  }

  .showcase-stack {
    grid-template-columns: 1fr;
  }

  .editor-preview {
    min-height: 430px;
  }

  .node {
    min-width: 118px;
    min-height: 64px;
    font-size: 14px;
  }

  .node.start {
    left: 6%;
  }

  .node.choice {
    left: 33%;
  }

  .node.result {
    right: 5%;
  }

  .node.ai {
    right: 12%;
  }
}

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

  *,
  *::before,
  *::after {
    animation-duration: 1ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 1ms !important;
  }

  .reveal {
    opacity: 1;
    transform: none;
  }
}