/* =========================
   Reset & Base
========================= */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: "Pretendard", -apple-system, BlinkMacSystemFont,
               "Apple SD Gothic Neo", "Noto Sans KR",
               "Segoe UI", Roboto, sans-serif;
  font-weight: 400;
  letter-spacing: -0.01em;
  color: #111;
  line-height: 1.6;
  background: #fff;
}

/* =========================
   Container
========================= */
.container {
  max-width: 970px;
  margin: 0 auto;
  padding: 0 32px;
}

/* =========================
   HERO
========================= */
.hero {
  height: 100vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

.hero.show {
  opacity: 1;
  transform: translateY(0);
}

.hero-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.hero-text {
  max-width: 640px;
}

.hero-text h1 {
  font-size: 44px;
  font-weight: 700;
  line-height: 1.35;
  margin-bottom: 24px;
}

.hero-text p {
  font-size: 18px;
  color: #555;
}

.hero-ui {
  flex: 1;
  height: 200px;
  background: transparent;
  overflow: visible;   /* 중요 */
}

.hero-ui img {
  width: auto;
  height: 100%;
  object-fit: contain;
  display: block;
  margin: 0 auto;
}

/* =========================
   WHO SCENE
========================= */
.who-scene {
  height: 220vh;
  position: relative;
}

.who {
  position: sticky;
  top: 0;
  height: 100vh;

  display: flex;
  align-items: center;
  justify-content: center;

  background: #fff;
  pointer-events: none;

  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.6s ease, transform 0.6s ease;
  will-change: opacity, transform;
}

.who.show {
  opacity: 1;
  transform: translateY(0);
}

.who.hide {
  opacity: 0;
  transform: translateY(-40px);
}

.who h2 {
  font-size: 36px;
  font-weight: 600;
  margin-bottom: 20px;
  text-align: center;
}

.who-desc {
  text-align: center;
  font-size: 16px;
  color: #555;
  margin-bottom: 40px;
}

.who-diagram {
  display: inline-block;
  padding: 24px 32px;
  background: #f5f5f5;
  border-radius: 16px;
  font-size: 15px;
}

/* =========================
   FEATURE
========================= */
.feature {
  padding: 80px 0;
}

.feature-inner {
  display: flex;
  gap: 80px;
  align-items: center;
}

.feature-inner.reverse {
  flex-direction: row-reverse;
}

.feature-text {
  max-width: 560px;
}

.context {
  display: block;
  font-size: 14px;
  color: #888;
  margin-bottom: 8px;
}

.feature-text h3 {
  font-size: 34px;
  font-weight: 600;
  line-height: 1.35;
  margin-bottom: 16px;
}

.feature-text p {
  font-size: 16px;
  color: #555;
}

.feature-ui {
  flex: 1;
  height: 360px;
  background: transparent;
  border-radius: 20px;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

.feature-ui img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: block;
}

/* =========================
   BREAK
========================= */
.break {
  padding: 120px 0;
  background: #fafafa;
  text-align: center;
}

.break p {
  font-size: 32px;
  font-weight: 500;
  margin-bottom: 20px;
}

.break strong {
  font-size: 24px;
  font-weight: 500;
}

/* =========================
   FULL FEATURE
========================= */
.feature-full {
  padding: 120px 0;
  text-align: center;
}

.feature-full h3 {
  font-size: 36px;
  font-weight: 600;
  margin-bottom: 40px;
}

.feature-ui.large {
  height: 500px;
}

/* =========================
   CONTACT
========================= */
.contact {
  padding: 120px 0;
  background: #111;
  color: #fff;
  text-align: center;
}

.contact h2 {
  font-size: 36px;
  font-weight: 600;
}

.contact button {
  margin-top: 24px;
  padding: 14px 36px;
  font-size: 16px;
  font-weight: 500;
  border-radius: 999px;
  border: none;
  cursor: pointer;
}

/* =========================
   LAUNCH
========================= */
.launch-date {
  margin-top: 16px;
  font-size: 15px;
  color: rgba(255, 255, 255, 0.7);
  letter-spacing: -0.01em;
  min-height: 1.6em;
  line-height: 1.6;
  opacity: 0;
  transform: translateY(6px);
  transition: opacity 0.4s ease, transform 0.4s ease;
}

.launch-date.show {
  opacity: 1;
  transform: translateY(0);
}

/* =========================
   Scroll Reveal
========================= */
.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.reveal.delay {
  transition-delay: 0.2s;
}

.reveal.from-left {
  transform: translateX(-40px);
}

.reveal.from-right {
  transform: translateX(40px);
}

.reveal.from-bottom {
  transform: translateY(60px);
}

.reveal.show {
  opacity: 1;
  transform: translate(0, 0);
}