/* ── Google Fonts ─────────────────────────────────────────── */
@import url("https://fonts.googleapis.com/css2?family=Cormorant+Garamond:ital,wght@0,300;0,400;1,300&family=Noto+Sans+KR:wght@300;400;500&display=swap");

/* ── CSS 변수 ─────────────────────────────────────────────── */
:root {
  --bg-light: #f4eefc;
  --bg-dark: #1a1a2e;
  --panel-light: rgba(248, 231, 255, 0.92);
  --panel-dark: rgba(20, 20, 40, 0.88);
  --text-light: #2e0032;
  --text-dark: #e8e0f0;
  --accent: #9e64ed;
  --accent-dark: #c8a96e;
  --radius: 6px;
  --transition: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  /* 현재 모드 (light 기본) */
  --panel-bg: var(--panel-light);
  --text-color: var(--text-light);
  --border-color: rgba(158, 100, 237, 0.25);
}
body.dark-mode {
  --panel-bg: var(--panel-dark);
  --text-color: var(--text-dark);
  --border-color: rgba(200, 169, 110, 0.25);
}

/* ── Reset ────────────────────────────────────────────────── */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: "Noto Sans KR", sans-serif;
  font-weight: 300;
  background-color: var(--bg-light);
  color: var(--text-color);
  -webkit-font-smoothing: antialiased;
  /* controls_area 진입을 위한 body scroll 공간 — main.min.js가 document scroll 감지 */
  height: 2000px;
}
body.dark-mode {
  background-color: var(--bg-dark);
}

/* 스크롤바 숨김 */
body::-webkit-scrollbar,
#SNAP_WRAP::-webkit-scrollbar {
  display: none;
}

/* ── Three.js 캔버스 ──────────────────────────────────────── */
#three-canvas {
  position: fixed;
  left: 0;
  top: 0;
  z-index: -1;
}

/* ── ① 진입 화면 ──────────────────────────────────────────── */
#FIRST_PAGE {
  position: fixed;
  z-index: 9999;
  inset: 0;
  display: flex;
  justify-content: center;
  align-items: center;
}
#LAYER_1 {
  position: fixed;
  z-index: 9997;
  inset: 0;
  background: var(--bg-light);
  transition: background var(--transition);
}
body.dark-mode #LAYER_1 {
  background: var(--bg-dark);
}

#FIRST_PAGE_TEXT {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  text-align: center;
  cursor: grab;
  user-select: none;
  /* p 태그 기본 margin 제거 */
  margin: 0;
}
#FIRST_PAGE_TEXT:active {
  cursor: grabbing;
}

.fp-sub {
  font-family: "Cormorant Garamond", serif;
  font-size: clamp(11px, 1.5vw, 14px);
  letter-spacing: 0.35em;
  color: var(--accent);
  text-transform: uppercase;
}
.fp-title {
  font-family: "Cormorant Garamond", serif;
  font-size: clamp(40px, 8vw, 80px);
  font-weight: 300;
  line-height: 1.1;
  color: var(--text-color);
  letter-spacing: 0.05em;
  transition: color var(--transition);
}
.fp-hint {
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--accent);
  opacity: 0.7;
  animation: hintBob 2s ease-in-out infinite;
}
@keyframes hintBob {
  0%,
  100% {
    transform: translateY(0);
    opacity: 0.7;
  }
  50% {
    transform: translateY(-6px);
    opacity: 1;
  }
}

/* ── ② 스냅 스크롤 ────────────────────────────────────────── */
/* controls_area가 z-index:9999로 올라올 때 위에 표시되어야 하므로 z-index 낮게 */
#SNAP_WRAP {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 1;
  width: 100vw;
  height: 100vh;
  overflow: scroll;
  scroll-snap-type: y mandatory;
  transition: opacity 0.3s ease;
}

.snap_section {
  position: relative;
  display: flex;
  width: 100vw;
  height: 100vh;
  scroll-snap-align: start;
  justify-content: flex-end;
  align-items: center;
  box-sizing: border-box;
}

.none {
  display: none !important;
}

/* ── 텍스트 패널 ──────────────────────────────────────────── */
.sc_article {
  width: 50vw;
  height: 100vh;
  background: var(--panel-bg);
  color: var(--text-color);
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-left: 1px solid var(--border-color);
  transition:
    background var(--transition),
    color var(--transition);
}

.article_box {
  padding: clamp(24px, 4vw, 48px) clamp(20px, 3.5vw, 44px);
  display: flex;
  flex-direction: column;
  gap: 16px;
}

/* 번호 */
.article_num {
  font-family: "Cormorant Garamond", serif;
  font-size: clamp(18px, 2.5vw, 24px);
  letter-spacing: 0.25em;
  color: var(--accent);
  display: block;
  font-weight: 400;
}

/* 제목 */
.article_box h2 {
  font-family: "Cormorant Garamond", serif;
  font-size: clamp(22px, 3vw, 32px);
  font-weight: 300;
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--text-color);
}

/* 구분선 */
.article_box h2::after {
  content: "";
  display: block;
  width: 28px;
  height: 1px;
  background: var(--accent);
  margin-top: 14px;
  opacity: 0.6;
}

/* 설명 — 올바른 말줄임 */
.article_box p {
  font-size: clamp(12px, 1.4vw, 14px);
  line-height: 1.9;
  color: var(--text-color);
  opacity: 0.75;
  display: -webkit-box;
  -webkit-line-clamp: 6;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* ── ③ 컨트롤 섹션 ───────────────────────────────────────── */
.controls_area {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: -1;
  transition-duration: 0.3s;
  background: linear-gradient(160deg, #1e1e2e 0%, #2a1a3e 60%, #1a1a2a 100%);
  color: #fff;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}

/* 스크롤 진행도 바 */
.loading_area {
  position: absolute;
  top: 0;
  left: 0;
  width: 100vw;
  height: 3px;
  background: rgba(158, 100, 237, 0.6);
}

/* 본문 컨텐츠 */
.ctrl_content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  text-align: center;
  padding: 0 24px;
  max-width: 480px;
  position: relative;
  z-index: 9999;
}

.ctrl_eyebrow {
  font-family: "Cormorant Garamond", serif;
  font-size: 12px;
  letter-spacing: 0.35em;
  color: var(--accent);
  text-transform: uppercase;
}

.ctrl_title {
  font-family: "Cormorant Garamond", serif;
  font-size: clamp(28px, 4vw, 44px);
  font-weight: 300;
  line-height: 1.25;
  color: #fff;
}

.ctrl_desc {
  font-size: clamp(12px, 1.4vw, 14px);
  line-height: 1.9;
  color: rgba(255, 255, 255, 0.45);
}

/* 아래 화살표 힌트 — controller 버튼 위치 안내 */
.ctrl_scroll_hint {
  margin-top: 8px;
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--accent);
  opacity: 0.7;
  animation: hintBob 2s ease-in-out infinite;
}

/* ── 번호 이동 버튼 (center / side 공통) ─────────────────── */
.move_btn {
  opacity: 0;
}

.move_btn_center {
  position: fixed;
  width: 40px;
  height: 40px;
  z-index: 2;
  border-radius: 50%;
  top: 50%;
  left: 50%;
  border: 1px solid rgba(255, 255, 255, 0.6);
  font-size: 16px;
  color: #fff;
  cursor: pointer;
  transition:
    transform var(--transition),
    background var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
  backdrop-filter: blur(4px);
  background: rgba(255, 255, 255, 0.15);
  text-shadow: 0 1px 4px rgba(0, 0, 0, 0.4);
}
.move_btn_center:hover {
  transform: scale(1.2);
  background: rgba(255, 255, 255, 0.9);
  color: #333;
  text-shadow: none;
}
.move_btn_center:active {
  background: var(--accent);
  color: #fff;
}

/* 사이드 버튼 영역 — h1 → div로 수정 */
.side_btn_area {
  position: absolute;
  top: 50%;
  right: calc(50vw + 12px); /* 패널(50vw) 바로 왼쪽 */
  transform: translateY(-50%);
  display: flex;
  flex-direction: column;
  gap: 10px;
  z-index: 9999;
}
.move_btn_side {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 15px;
  font-weight: 500;
  border-radius: 50%;
  border: 2px solid rgba(100, 50, 180, 0.5);
  cursor: pointer;
  transition:
    transform var(--transition),
    background var(--transition),
    color var(--transition),
    border-color var(--transition);
  background: rgba(255, 255, 255, 0.75);
  color: var(--accent);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  box-shadow:
    0 2px 14px rgba(100, 50, 180, 0.2),
    0 1px 4px rgba(0, 0, 0, 0.1);
}
.move_btn_side:hover {
  transform: scale(1.2);
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}
.move_btn_side:active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

/* dark 모드 — 어두운 배경에서 반전 */
body.dark-mode .move_btn_center {
  border-color: rgba(255, 255, 255, 0.5);
  color: #fff;
  background: rgba(255, 255, 255, 0.12);
}
body.dark-mode .move_btn_side {
  border-color: rgba(255, 255, 255, 0.85);
  background: rgba(255, 255, 255, 0.82);
  color: #111;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.5);
}
body.dark-mode .move_btn_side:hover {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

/* ── UI 버튼 그룹 ─────────────────────────────────────────── */
#LIGHT_BTN_WRAP {
  position: fixed;
  top: 16px;
  left: 16px;
  z-index: 9999;
}

#UI_GROUP {
  display: flex;
  align-items: center;
  gap: 4px;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid rgba(0, 0, 0, 0.1);
  border-radius: 10px;
  padding: 4px 6px;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
  transition: background var(--transition);
}
body.dark-mode #UI_GROUP {
  background: rgba(30, 30, 50, 0.88);
  border-color: rgba(255, 255, 255, 0.1);
}

#UI_GROUP button {
  border: none;
  background: transparent;
  width: 32px;
  height: 32px;
  border-radius: 6px;
  font-size: 16px;
  cursor: pointer;
  color: #555;
  display: flex;
  align-items: center;
  justify-content: center;
  transition:
    background var(--transition),
    color var(--transition);
}
#UI_GROUP button:hover {
  background: rgba(158, 100, 237, 0.12);
  color: var(--accent);
}
#UI_GROUP button:active {
  background: rgba(158, 100, 237, 0.25);
}
body.dark-mode #UI_GROUP button {
  color: #ccc;
}

.btn_divider {
  width: 1px;
  height: 18px;
  background: rgba(0, 0, 0, 0.12);
  margin: 0 2px;
}
body.dark-mode .btn_divider {
  background: rgba(255, 255, 255, 0.12);
}

/* 활성 버튼 표시 */
#LIGHT_MODE.active,
#DARK_MODE.active {
  background: rgba(158, 100, 237, 0.15);
  color: var(--accent);
}

/* ── CONTROLLER 버튼 ──────────────────────────────────────── */
/* 기본: 화면 중앙 배치 */
#LIGHT_BTN_WRAP_CTRL {
  position: fixed;
  left: 50%;
  transform: translate(-50%, -50%);
  top: 60%;
  z-index: 9999;
  transition:
    top 0.5s cubic-bezier(0.4, 0, 0.2, 1),
    transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}
/* 활성화(.active)되면 하단으로 이동 */
#LIGHT_BTN_WRAP_CTRL.active {
  top: auto;
  bottom: 10vh;
  transform: translateX(-50%);
}

#CONTROLLER {
  background: rgba(255, 255, 255, 0.12);
  color: #fff;
  border: 1px solid rgba(158, 100, 237, 0.6);
  padding: 14px 32px;
  border-radius: 10px;
  font-family: "Noto Sans KR", sans-serif;
  font-size: 14px;
  cursor: pointer;
  letter-spacing: 0.08em;
  position: relative;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  box-shadow: 0 0 24px rgba(158, 100, 237, 0.2);
  transition:
    background var(--transition),
    color var(--transition),
    box-shadow var(--transition),
    padding var(--transition);
}
/* 비활성 상태: 주목을 끄는 pulse */
#CONTROLLER:not(.on) {
  animation: ctrlPulse 2.5s ease-in-out infinite;
}
@keyframes ctrlPulse {
  0%,
  100% {
    box-shadow: 0 0 16px rgba(158, 100, 237, 0.25);
  }
  50% {
    box-shadow: 0 0 36px rgba(158, 100, 237, 0.55);
  }
}
#CONTROLLER::before {
  content: "";
  position: absolute;
  bottom: -20px;
  left: 50%;
  transform: translateX(-50%);
  width: 40px;
  height: 6px;
  border: 1px solid rgba(158, 100, 237, 0.4);
  border-radius: 3px;
  background: rgba(158, 100, 237, 0.2);
}
#CONTROLLER::after {
  content: "";
  position: absolute;
  bottom: -40px;
  left: 50%;
  transform: translateX(-50%);
  width: 20px;
  height: 4px;
  border: 1px solid rgba(158, 100, 237, 0.3);
  border-radius: 2px;
  background: rgba(158, 100, 237, 0.15);
}
#CONTROLLER:hover {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 0 32px rgba(158, 100, 237, 0.5);
}
/* 활성(on): 종료 버튼으로 변환 */
#CONTROLLER.on {
  background: rgba(220, 50, 80, 0.85);
  border-color: rgba(220, 50, 80, 0.8);
  color: #fff;
  padding: 8px 20px;
  animation: none;
  box-shadow: 0 0 20px rgba(220, 50, 80, 0.35);
}

/* ── 04섹션 번호 안내 패널 ────────────────────────────────── */
.sc_article_nav .nav_desc {
  font-size: clamp(12px, 1.4vw, 14px);
  line-height: 1.9;
  color: var(--text-color);
  opacity: 0.6;
}

/* 번호 미리보기 */
.nav_num_preview {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 4px;
}
.nav_num_preview span {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 15px;
  color: var(--accent);
  font-family: "Cormorant Garamond", serif;
  background: rgba(158, 100, 237, 0.06);
  /* 순서대로 페이드인 */
  animation: numFadeIn 0.4s ease both;
}
.nav_num_preview span:nth-child(1) {
  animation-delay: 0s;
}
.nav_num_preview span:nth-child(2) {
  animation-delay: 0.08s;
}
.nav_num_preview span:nth-child(3) {
  animation-delay: 0.16s;
}
.nav_num_preview span:nth-child(4) {
  animation-delay: 0.24s;
}
.nav_num_preview span:nth-child(5) {
  animation-delay: 0.32s;
}
.nav_num_preview span:nth-child(6) {
  animation-delay: 0.4s;
}
@keyframes numFadeIn {
  from {
    opacity: 0;
    transform: scale(0.7);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

/* 힌트 문구 */
.nav_hint {
  font-size: 12px;
  letter-spacing: 0.15em;
  color: var(--accent);
  opacity: 0.7;
  animation: hintBob 2s ease-in-out infinite;
}

/* ── 반응형 ───────────────────────────────────────────────── */
@media (max-width: 768px) {
  body {
    overflow-x: hidden;
  }

  /* 섹션: 하단 패널 오버레이 구조 */
  .snap_section {
    height: 100vh;
    justify-content: flex-start;
    align-items: flex-end;
    position: relative;
  }

  /* 패널: 각 섹션 하단 absolute 고정 */
  .sc_article {
    width: 100vw;
    height: 38vh;
    min-height: unset;
    max-height: unset;
    position: absolute;
    bottom: 0;
    left: 0;
    border-left: none;
    border-top: 1px solid var(--border-color);
    overflow-y: auto;
    z-index: 10;
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
  }

  .article_box {
    padding: 14px 18px 22px;
    gap: 8px;
  }

  .article_num {
    font-size: 14px;
  }

  .article_box h2 {
    font-size: clamp(17px, 5vw, 22px);
  }

  .article_box p {
    font-size: 12px;
    line-height: 1.7;
    -webkit-line-clamp: 3;
  }

  /* 사이드 버튼: 섹션 내 absolute */
  .side_btn_area {
    position: absolute;
    right: 12px;
    bottom: calc(38vh + 10px);
    top: auto;
    transform: none;
  }

  .move_btn_side {
    width: 32px;
    height: 32px;
    font-size: 13px;
  }

  /* 빌딩 위 번호 오버레이 버튼 축소 */
  .move_btn_center {
    width: 28px;
    height: 28px;
    font-size: 12px;
  }

  /* UI 버튼 */
  #UI_GROUP button {
    width: 28px;
    height: 28px;
    font-size: 14px;
  }

  /* controls_area */
  .ctrl_content {
    padding: 0 20px;
    gap: 12px;
  }
  .ctrl_title {
    font-size: clamp(22px, 6vw, 30px);
  }
  .ctrl_desc {
    font-size: 12px;
  }

  /* CONTROLLER 버튼 위치 */
  #LIGHT_BTN_WRAP_CTRL {
    top: 52%;
  }
  #CONTROLLER {
    padding: 12px 26px;
    font-size: 13px;
  }

  /* 04섹션 번호 미리보기 */
  .nav_num_preview span {
    width: 32px;
    height: 32px;
    font-size: 13px;
  }
}

@media (max-width: 480px) {
  .sc_article {
    min-height: 40vh;
    max-height: 46vh;
  }

  .side_btn_area {
    bottom: calc(46vh + 8px);
    right: 8px;
  }

  .move_btn_side {
    width: 28px;
    height: 28px;
    font-size: 12px;
  }

  .fp-title {
    font-size: clamp(30px, 10vw, 42px);
  }
}