:root {
  color-scheme: dark;
  --bg: #020402;
  --text: #f6f7f2;
  --muted: rgb(246 247 242 / 68%);
  --green: #48c42f;
  --green-soft: rgb(72 196 47 / 16%);
  --green-line: rgb(72 196 47 / 82%);
  --panel: rgb(2 6 2 / 58%);
  --header-height: 78px;
  font-family: Inter, Pretendard, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
  overflow: hidden;
}

body {
  background:
    radial-gradient(circle at 50% 35%, rgb(73 108 55 / 20%), transparent 32rem),
    linear-gradient(180deg, #000 0%, #030603 100%);
}

button,
[contenteditable="true"] {
  font: inherit;
}

.site-header {
  position: fixed;
  z-index: 20;
  top: 0;
  left: 0;
  display: flex;
  width: 100%;
  min-height: var(--header-height);
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 22px clamp(24px, 6vw, 80px);
  pointer-events: none;
}

.brand {
  color: var(--text);
  font-size: clamp(24px, 4vw, 44px);
  font-weight: 500;
  letter-spacing: 0.02em;
  text-decoration: none;
  pointer-events: auto;
}

.slide-nav {
  display: flex;
  gap: 10px;
  pointer-events: auto;
}

.slide-nav button,
.arrow-button,
.dot {
  border: 1px solid rgb(72 196 47 / 42%);
  background: rgb(0 0 0 / 42%);
  color: var(--text);
  cursor: pointer;
  transition: 180ms ease;
}

.slide-nav button {
  border-radius: 999px;
  padding: 8px 14px;
  color: var(--muted);
  font-size: 12px;
  letter-spacing: 0.12em;
}

.slide-nav button:hover,
.slide-nav button.is-active,
.arrow-button:hover,
.dot.is-active {
  border-color: var(--green-line);
  color: var(--green);
  box-shadow: 0 0 18px rgb(72 196 47 / 22%);
}

.deck {
  height: 100vh;
  transform: translate3d(0, 0, 0);
  transition: transform 900ms cubic-bezier(0.68, -0.6, 0.32, 1.6);
  will-change: transform;
}

.slide {
  position: relative;
  display: grid;
  height: 100vh;
  min-height: 640px;
  overflow: hidden;
  padding: calc(var(--header-height) + 26px) clamp(24px, 7vw, 96px) 56px;
  isolation: isolate;
}

.slide::before {
  position: absolute;
  inset: 0;
  z-index: -3;
  content: "";
  background:
    linear-gradient(90deg, rgb(0 0 0 / 72%), transparent 45%, rgb(0 0 0 / 45%)),
    radial-gradient(circle at center, transparent 35%, rgb(0 0 0 / 55%) 76%);
}

.tank-stage {
  position: absolute;
  inset: 0;
  z-index: -2;
  display: grid;
  place-items: center;
  opacity: 0.88;
  pointer-events: none;
}

.tank-stage-muted {
  opacity: 0.56;
}

.tank-image {
  position: absolute;
  width: min(118vw, 1550px);
  max-width: none;
  filter: drop-shadow(0 30px 52px rgb(0 0 0 / 84%));
  user-select: none;
}

.tank-main {
  opacity: 0.36;
  transform: translateY(7vh) scale(1.04);
}

.tank-shadow {
  opacity: 0.18;
  mix-blend-mode: screen;
  filter: blur(2px) saturate(.7) drop-shadow(0 0 24px rgb(72 196 47 / 20%));
}

.tank-shadow-a {
  transform: translate(-18px, 5vh) scale(1.06);
}

.tank-shadow-b {
  transform: translate(22px, 8vh) scale(1.02);
}

.slide-content {
  position: relative;
  z-index: 2;
  align-self: center;
}

.hero-content {
  width: min(760px, 84vw);
  justify-self: center;
  text-align: center;
  transform: translateY(-18vh);
}

.section-kicker {
  margin: 0 0 8px;
  color: var(--muted);
  font-size: clamp(18px, 3vw, 30px);
  letter-spacing: 0.04em;
}

h1,
h2 {
  margin: 0;
  color: var(--text);
  font-weight: 500;
  line-height: .96;
}

h1 {
  font-size: clamp(54px, 11vw, 132px);
}

h2 {
  font-size: clamp(42px, 7vw, 92px);
}

.text-slot,
.text-area,
.text-card {
  border: 1px solid var(--green-line);
  border-radius: 18px;
  background: var(--green-soft);
  color: var(--green);
  outline: none;
  box-shadow: inset 0 0 28px rgb(0 0 0 / 36%), 0 0 24px rgb(72 196 47 / 10%);
}

/* 텍스트 길이에 따라 유동적으로 조절 */
.text-slot {
  width: fit-content;
  max-width: min(100%, 800px);
}

.text-slot:focus,
.text-area:focus,
.text-card:focus {
  border-color: #7fff5d;
  box-shadow: 0 0 0 3px rgb(72 196 47 / 18%), 0 0 32px rgb(72 196 47 / 18%);
}

.text-slot-main {
  min-height: 74px;
  margin: 32px auto 0;
  padding: 22px 28px;
  font-size: clamp(18px, 2vw, 26px);
}

/* 텍스트 로테이터 3D 효과 */
.text-rotator {
  position: relative;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 320px;
}

.rotator-item {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 100%;
  transform: translate(-50%, -50%) scale(0.8) rotateX(90deg);
  opacity: 0;
  transition: transform 0.9s cubic-bezier(0.68, -0.6, 0.32, 1.6), opacity 0.9s ease;
  text-align: center;
  pointer-events: none;
}

.rotator-item.active {
  transform: translate(-50%, -50%) scale(1) rotateX(0deg);
  opacity: 1;
  pointer-events: auto;
}

.rotator-item.prev {
  transform: translate(-50%, -50%) scale(0.8) rotateX(-90deg);
  opacity: 0;
}

.layered-content {
  display: grid;
  width: min(100%, 1100px);
  height: 100%;
  align-items: center;
}

.layered-content h2 {
  position: absolute;
  top: 17vh;
  left: clamp(24px, 7vw, 96px);
}

.layered-content .text-slot {
  position: absolute;
  display: grid;
  min-height: 86px;
  place-items: center;
  padding: 20px 30px;
  font-size: clamp(18px, 2.2vw, 28px);
  text-align: center;
}

.slot-left {
  top: 30vh;
  left: 12vw;
}

.slot-center {
  top: 47vh;
  left: 34vw;
}

.slot-right {
  right: 12vw;
  bottom: 18vh;
}

.split-layout {
  display: grid;
  align-items: center;
  gap: clamp(28px, 6vw, 72px);
  grid-template-columns: minmax(280px, 0.85fr) minmax(360px, 1.15fr);
}

.copy-panel {
  position: relative;
  z-index: 3;
}

.text-area {
  min-height: 280px;
  margin-top: 28px;
  padding: 28px;
  color: var(--text);
  font-size: clamp(18px, 2vw, 24px);
  line-height: 1.7;
}

.image-stack {
  position: relative;
  min-height: 520px;
  perspective: 1200px;
}

.image-stack img {
  position: absolute;
  top: 50%;
  left: 50%;
  width: min(68vw, 900px);
  max-width: none;
  opacity: .54;
  filter: drop-shadow(0 38px 60px rgb(0 0 0 / 72%));
}

.image-stack img:nth-child(1) {
  transform: translate(-58%, -44%) rotateY(-18deg) scale(.78);
  opacity: .22;
}

.image-stack img:nth-child(2) {
  transform: translate(-50%, -50%) rotateY(-7deg) scale(.94);
}

.image-stack img:nth-child(3) {
  transform: translate(-42%, -56%) rotateY(11deg) scale(.7);
  opacity: .24;
}

.detail-content {
  align-self: center;
}

.card-grid {
  display: grid;
  width: min(100%, 1160px);
  margin-top: 36px;
  gap: 22px;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.text-card {
  display: flex;
  flex-direction: column;
  overflow: hidden;
  padding: 0;
  border: 1px solid var(--green-line);
  border-radius: 18px;
  background: var(--green-soft);
  color: var(--text);
  box-shadow: inset 0 0 28px rgb(0 0 0 / 36%), 0 0 24px rgb(72 196 47 / 10%);
}

.card-image-wrap {
  width: 100%;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  border-bottom: 1px solid var(--green-line);
}

.card-image-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.text-card:hover .card-image-wrap img {
  transform: scale(1.1);
}

.card-text {
  padding: 20px;
  font-size: 18px;
  line-height: 1.5;
  flex-grow: 1;
}

.deck-controls {
  position: fixed;
  z-index: 30;
  right: clamp(18px, 3vw, 36px);
  top: 50%;
  display: grid;
  justify-items: center;
  gap: 14px;
  transform: translateY(-50%);
}

.arrow-button {
  width: 42px;
  height: 42px;
  border-radius: 50%;
}

.dots {
  display: grid;
  gap: 10px;
}

.dot {
  width: 10px;
  height: 10px;
  padding: 0;
  border-radius: 50%;
}

.slide > * {
  transition: transform 800ms cubic-bezier(0.68, -0.6, 0.32, 1.6), opacity 800ms ease;
}

.slide:not(.is-active) > * {
  opacity: .22;
  transform: translateY(22px) rotateX(2deg);
}

@media (max-width: 860px) {
  .slide-nav {
    display: none;
  }

  .slide {
    min-height: 620px;
    padding-inline: 22px;
    display: block; /* 모바일에서 그리드 해제 */
    overflow-y: auto; /* 내용이 많을 경우 스크롤 허용 */
  }

  .tank-image {
    width: 150vw;
  }

  .hero-content {
    transform: translateY(0);
    margin: 10vh auto;
  }

  .layered-content {
    display: flex;
    flex-direction: column;
    gap: 20px;
    height: auto;
    width: 100%;
    margin-top: 5vh;
  }

  .layered-content h2 {
    position: relative;
    top: 0;
    left: 0;
    margin-bottom: 20px;
    text-align: center;
  }

  .layered-content .text-slot {
    position: relative;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    width: 100%;
    max-width: 100%;
    margin: 0 auto;
    min-height: auto;
  }

  .split-layout,
  .card-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .image-stack {
    display: none; /* 모바일에서 겹치는 이미지 숨김 (선택 사항) */
  }

  .deck-controls {
    right: 14px;
  }
}