/* ═══════════════════════════════════
   INTRO OVERLAY
   전체화면 인트로 씬 — 애니메이션 완료 후 자동 제거
═══════════════════════════════════ */

/* --border(#b8a88c) 기반 투명도 변수 — intro 전용 */
#intro_overlay {
  --g90: color-mix(in srgb, var(--border) 90%, transparent);
  --g60: color-mix(in srgb, var(--border) 60%, transparent);
  --g40: color-mix(in srgb, var(--border) 40%, transparent);
  --g20: color-mix(in srgb, var(--border) 20%, transparent);
  --g10: color-mix(in srgb, var(--border) 10%, transparent);
  --g05: color-mix(in srgb, var(--border)  5%, transparent);
  --metal-dark: #4a3a28;
  --metal-bright: #fff8e8;
  /* 반응형 스케일 — 미디어쿼리에서 덮어씀 */
  --intro-pad-x: clamp(16px, 5vw, 48px);
  --intro-core-hot: clamp(32px, 7vw, 48px);
  --intro-core-gold: clamp(96px, 26vw, 180px);
  --intro-core-bloom: clamp(168px, 46vw, 320px);
  --intro-core-flash: clamp(72px, 18vw, 120px);
  --intro-beam-line: min(1100px, 145vw);
  --intro-ghost-line: min(700px, 95vw);
  --intro-haze-w: clamp(220px, 62vw, 500px);
  --intro-haze-h: clamp(124px, 35vw, 280px);
  --intro-haze-outer-w: clamp(360px, 98vw, 800px);
  --intro-haze-outer-h: clamp(180px, 50vw, 400px);
  --intro-logo-burst: clamp(260px, 88vmin, 600px);
  --intro-v-core: clamp(36px, 11vw, 80px);
  --intro-final-glow: clamp(140px, 42vmin, 300px);
  /* beam_travel — JS에서 뷰포트별로 덮어씀 */
  --beam-start-x: -120vw;
  --beam-mid-x: 50vw;
  --beam-end-x: 220vw;
}

/* 인트로 전체 래퍼: 화면 전체를 덮음 */
#intro_overlay {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100svh;
  min-height: 100vh;
  background: #ececec;
  z-index: 9999;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: opacity 0.8s ease;
}

/* 필름 그레인 — 영상미 질감 */
.intro_grain {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 2;
  opacity: 0.045;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  background-size: 180px 180px;
  mix-blend-mode: multiply;
}

/* 비네팅 */
.intro_vignette {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 1;
  background: radial-gradient(
    ellipse 75% 70% at 50% 50%,
    transparent 40%,
    rgba(0, 0, 0, 0.18) 100%
  );
}

/* 코어 피크 시 화면 플래시 */
.intro_screen_flash {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 3;
  background: radial-gradient(
    ellipse 60% 45% at 50% 50%,
    rgba(255, 252, 235, 0.95) 0%,
    rgba(255, 248, 210, 0.35) 35%,
    transparent 70%
  );
  opacity: 0;
  animation: screen_flash 2.6s ease-out 0.15s forwards;
}

@keyframes screen_flash {
  0%, 38%  { opacity: 0; }
  48%      { opacity: 0.15; }
  52%      { opacity: 0.85; }
  58%      { opacity: 0.35; }
  68%      { opacity: 0.08; }
  100%     { opacity: 0; }
}

/* 인트로 재생 중 — 페이지 스크롤/스크롤바 숨김 */
html.intro-active,
html.intro-active body {
  overflow: hidden;
}

/* 인트로가 끝나면 js가 이 클래스를 붙임 */
#intro_overlay.intro--done {
  opacity: 0;
  pointer-events: none;
}

/* ─── 골드 라이트 빔 — 수평 시네마틱 패스 ─────── */
.intro_beam {
  position: absolute;
  top: 0;
  left: 0;
  width: 0;
  height: 0;
  pointer-events: none;
  z-index: 4;
  transform: translate(var(--beam-start-x), 50vh);
  animation: beam_travel 2.6s cubic-bezier(0.42, 0, 0.2, 1) 0.15s forwards;
}

@keyframes beam_travel {
  0%   { transform: translate(var(--beam-start-x), 50vh); }
  22%  { transform: translate(var(--beam-mid-x),  50vh); }
  48%  { transform: translate(var(--beam-end-x), 50vh); }
  100% { transform: translate(var(--beam-end-x), 50vh); }
}

/* 아나모픽 수평 플레어 */
.intro_anamorphic {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 160vw;
  height: 3px;
  transform: translate(-50%, -50%);
  background: linear-gradient(
    90deg,
    transparent 0%,
    color-mix(in srgb, var(--border) 8%, transparent) 15%,
    color-mix(in srgb, var(--border) 35%, transparent) 35%,
    rgba(255, 255, 245, 1) 50%,
    color-mix(in srgb, var(--border) 35%, transparent) 65%,
    color-mix(in srgb, var(--border) 8%, transparent) 85%,
    transparent 100%
  );
  filter: blur(1px);
  box-shadow:
    0 0 20px 4px rgba(255, 252, 220, 0.6),
    0 0 60px 12px color-mix(in srgb, var(--border) 35%, transparent),
    0 0 120px 30px color-mix(in srgb, var(--border) 12%, transparent);
  opacity: 0;
  animation: anamorphic_pulse 2.6s ease-in-out 0.15s forwards;
}

@keyframes anamorphic_pulse {
  0%, 30%  { opacity: 0; transform: translate(-50%, -50%) scaleX(0.3); }
  48%      { opacity: 1; transform: translate(-50%, -50%) scaleX(1); }
  55%      { opacity: 1; transform: translate(-50%, -50%) scaleX(1.08); filter: brightness(1.8); }
  72%      { opacity: 0.4; transform: translate(-50%, -50%) scaleX(0.9); }
  100%     { opacity: 0; transform: translate(-50%, -50%) scaleX(0.5); }
}

/* 발광 코어 — 다층 레이어 */
.intro_core {
  position: absolute;
  top: 50%;
  left: 50%;
  border-radius: 50%;
  pointer-events: none;
  transform: translate(-50%, -50%);
}

/* ① 핫 화이트 코어 */
.intro_core--hot {
  width: var(--intro-core-hot);
  height: var(--intro-core-hot);
  background: radial-gradient(
    circle,
    #ffffff 0%,
    #fffef5 30%,
    rgba(255, 252, 220, 0.6) 55%,
    transparent 75%
  );
  filter: blur(2px);
  opacity: 0;
  animation: core_hot 2.6s ease-in-out 0.15s forwards;
}

@keyframes core_hot {
  0%, 40%  { opacity: 0; transform: translate(-50%, -50%) scale(0.2); }
  50%      { opacity: 1; transform: translate(-50%, -50%) scale(1.2); filter: blur(1px) brightness(2.5); }
  54%      { opacity: 1; transform: translate(-50%, -50%) scale(1.8); filter: blur(0px) brightness(4); }
  62%      { opacity: 0.7; transform: translate(-50%, -50%) scale(1); }
  100%     { opacity: 0; transform: translate(-50%, -50%) scale(0.3); }
}

/* ② 골드 링 */
.intro_core--gold {
  width: var(--intro-core-gold);
  height: var(--intro-core-gold);
  background: radial-gradient(
    circle,
    rgba(255, 252, 225, 0.95) 0%,
    rgba(255, 248, 200, 0.7) 12%,
    color-mix(in srgb, var(--border) 55%, #fff) 28%,
    color-mix(in srgb, var(--border) 25%, transparent) 50%,
    transparent 72%
  );
  filter: blur(18px);
  opacity: 0;
  animation: core_gold 2.6s ease-in-out 0.15s forwards;
}

@keyframes core_gold {
  0%, 38%  { opacity: 0; transform: translate(-50%, -50%) scale(0.3); }
  50%      { opacity: 0.9; transform: translate(-50%, -50%) scale(2.2); filter: blur(14px) brightness(2); }
  56%      { opacity: 1; transform: translate(-50%, -50%) scale(3.4); filter: blur(10px) brightness(3); }
  68%      { opacity: 0.45; transform: translate(-50%, -50%) scale(1.6); }
  100%     { opacity: 0; transform: translate(-50%, -50%) scale(0.4); }
}

/* ③ 외곽 블룸 */
.intro_core--bloom {
  width: var(--intro-core-bloom);
  height: var(--intro-core-bloom);
  background: radial-gradient(
    circle,
    rgba(255, 250, 210, 0.4) 0%,
    color-mix(in srgb, var(--border) 30%, transparent) 30%,
    color-mix(in srgb, var(--border) 10%, transparent) 55%,
    transparent 75%
  );
  filter: blur(42px);
  opacity: 0;
  box-shadow:
    0 0 80px 40px rgba(255, 252, 220, 0.5),
    0 0 160px 80px color-mix(in srgb, var(--border) 25%, transparent);
  animation: core_bloom 2.6s ease-in-out 0.15s forwards;
}

@keyframes core_bloom {
  0%, 36%  { opacity: 0; transform: translate(-50%, -50%) scale(0.4); }
  52%      { opacity: 0.8; transform: translate(-50%, -50%) scale(2.8); }
  58%      { opacity: 1; transform: translate(-50%, -50%) scale(4.2); filter: blur(36px) brightness(1.6); }
  75%      { opacity: 0.2; transform: translate(-50%, -50%) scale(1.2); }
  100%     { opacity: 0; transform: translate(-50%, -50%) scale(0.5); }
}

/* 레거시 ::before 코어 — 아나모픽 보조 */
.intro_beam::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: var(--intro-core-flash);
  height: var(--intro-core-flash);
  border-radius: 50%;
  background: radial-gradient(
    circle,
    rgba(255, 255, 255, 1) 0%,
    rgba(255, 252, 225, 0.85) 15%,
    transparent 60%
  );
  filter: blur(20px);
  opacity: 0;
  animation: core_flash 2.6s ease-in-out 0.15s forwards;
}

@keyframes core_flash {
  0%, 42%  { opacity: 0; transform: translate(-50%, -50%) scale(0.3); }
  52%      { opacity: 1; transform: translate(-50%, -50%) scale(2.5); filter: blur(8px) brightness(3.5); }
  58%      { opacity: 0.8; transform: translate(-50%, -50%) scale(3.5); }
  100%     { opacity: 0; transform: translate(-50%, -50%) scale(0.2); }
}

/* ─── 잔상 고스트 빔 ─────────────────────
   JS에서 .intro_ghost 요소를 생성, 딜레이를 줘서 뒤따라오게 함
─────────────────────────────────────── */
.intro_ghost {
  position: absolute;
  top: 0;
  left: 0;
  width: 0;
  height: 0;
  pointer-events: none;
  z-index: 3;
  transform: translate(var(--beam-start-x), 50vh);
  animation: beam_travel var(--ghost-dur, 2.6s) cubic-bezier(0.42, 0, 0.2, 1) var(--ghost-delay, 0.4s) forwards;
}

/* 고스트 코어: 메인보다 더 흐리고 작음 */
.intro_ghost::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: var(--ghost-size, 140px);
  height: var(--ghost-size, 140px);
  border-radius: 50%;
  background: radial-gradient(
    circle,
    rgba(255, 255, 255, var(--ghost-op, 0.4))  0%,
    rgba(255, 248, 200, 0.2)                   20%,
    color-mix(in srgb, var(--border) 12%, transparent) 50%,
    transparent 75%
  );
  filter: blur(var(--ghost-blur, 36px));
}

/* 고스트 광선: 수평 잔상 */
.intro_ghost::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) rotate(0deg);
  width: var(--intro-ghost-line);
  height: 1px;
  background: linear-gradient(
    90deg,
    transparent 0%,
    color-mix(in srgb, var(--border) 15%, transparent) 30%,
    rgba(255, 252, 220, var(--ghost-op, 0.3)) 50%,
    color-mix(in srgb, var(--border) 15%, transparent) 70%,
    transparent 100%
  );
  filter: blur(2px);
  opacity: var(--ghost-op, 0.3);
}

/* 긴 가로 빛줄기 */
.intro_beam::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) rotate(0deg);
  width: var(--intro-beam-line);
  height: 2px;
  background: linear-gradient(
    90deg,
    transparent                                          0%,
    color-mix(in srgb, var(--border) 5%, transparent)   8%,
    color-mix(in srgb, var(--border) 45%, transparent)  32%,
    rgba(255, 255, 245, 1)                             50%,
    color-mix(in srgb, var(--border) 45%, transparent)  68%,
    color-mix(in srgb, var(--border) 5%, transparent)   92%,
    transparent                                          100%
  );
  filter: blur(0.5px);
  box-shadow:
    0 0 12px 3px rgba(255, 252, 220, 0.7),
    0 0 40px 8px color-mix(in srgb, var(--border) 40%, transparent);
}

/* ─── 추가 광선들 (span 요소, JS에서 생성) ─ */

/* 보조 광선 공통 스타일 */
.intro_ray {
  position: absolute;
  top: 50%;
  left: 50%;
  transform-origin: left center;
  height: 1px;
  pointer-events: none;
  background: linear-gradient(
    90deg,
    rgba(255, 252, 220, 0.9)                            0%,
    color-mix(in srgb, var(--border) 30%, transparent)  40%,
    transparent                                         100%
  );
  filter: blur(0.5px);
}

/* 짧은 교차 광선 (45도 방향) */
.intro_ray--cross {
  width: 300px;
  height: 1px;
  background: linear-gradient(
    90deg,
    rgba(255, 255, 220, 0.7)                            0%,
    color-mix(in srgb, var(--border) 20%, transparent)  50%,
    transparent                                         100%
  );
}

/* 헤이즈: 코어 주변 부드러운 빛 번짐 */
.intro_haze {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: var(--intro-haze-w);
  height: var(--intro-haze-h);
  border-radius: 50%;
  background: radial-gradient(
    ellipse,
    rgba(255, 250, 210, 0.45)                            0%,
    color-mix(in srgb, var(--border) 18%, transparent)   45%,
    transparent                                          75%
  );
  filter: blur(24px);
  pointer-events: none;
  opacity: 0;
  animation: haze_pulse 2.6s ease-in-out 0.15s forwards;
}

.intro_haze--outer {
  width: var(--intro-haze-outer-w);
  height: var(--intro-haze-outer-h);
  background: radial-gradient(
    ellipse,
    color-mix(in srgb, var(--border) 12%, transparent) 0%,
    transparent 70%
  );
  filter: blur(40px);
  animation-delay: 0.25s;
}

@keyframes haze_pulse {
  0%, 35%  { opacity: 0; transform: translate(-50%, -50%) scale(0.5); }
  52%      { opacity: 1; transform: translate(-50%, -50%) scale(1.1); }
  65%      { opacity: 0.5; }
  100%     { opacity: 0; transform: translate(-50%, -50%) scale(0.8); }
}

/* ─── 렌즈 플레어 (더미) — 기존 호환용 빈 규칙 ─ */
.intro_flare { display: none; }
@keyframes flare_burst {}

/* ─── 파티클 ────────────────────────── */
.intro_particle {
  position: absolute;
  border-radius: 50%;
  background: radial-gradient(circle, #fff8d6, var(--border));
  opacity: 0;
  pointer-events: none;
  z-index: 5;
  box-shadow: 0 0 6px 1px color-mix(in srgb, var(--border) 60%, transparent);
  animation: particle_float var(--dur, 1.2s) ease-out var(--delay, 0.6s) forwards;
}

.intro_particle--streak {
  border-radius: 999px;
  background: linear-gradient(90deg, transparent, rgba(255, 248, 210, 0.9), transparent);
  box-shadow: 0 0 8px 2px color-mix(in srgb, var(--border) 40%, transparent);
  animation: particle_streak var(--dur, 1.4s) ease-out var(--delay, 0.5s) forwards;
}

@keyframes particle_streak {
  0%   { opacity: 0; transform: translate(0, 0) scaleX(0); }
  15%  { opacity: 0.85; }
  100% { opacity: 0; transform: translate(var(--tx2, 80px), var(--ty2, 0)) scaleX(1); }
}

@keyframes particle_float {
  0%   { opacity: 0; transform: translate(0, 0) scale(0); }
  20%  { opacity: 0.9; transform: translate(var(--tx1, 20px), var(--ty1, -15px)) scale(1); }
  100% { opacity: 0; transform: translate(var(--tx2, 60px), var(--ty2, -40px)) scale(0.3); }
}

/* ─── 슬로건 텍스트 ─────────────────── */
/* 빔 이후 서서히 등장하는 메탈 질감 텍스트 */
.intro_slogan {
  position: absolute;
  inset: 0;
  z-index: 6;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.4em;
  padding: 0 var(--intro-pad-x);
  pointer-events: none;
}

.intro_slogan_line {
  font-family: "Playfair", serif;
  font-size: clamp(14px, 3.8vw, 52px);
  font-weight: 400;
  letter-spacing: 0.22em;
  text-align: center;
  max-width: 100%;
  line-height: 1.35;
  word-break: keep-all;
  overflow-wrap: anywhere;
  color: transparent;
  background: linear-gradient(
    110deg,
    var(--metal-dark) 0%,
    var(--metal-dark) 42%,
    var(--metal-bright) 50%,
    var(--metal-dark) 58%,
    var(--metal-dark) 100%
  );
  background-size: 220% 100%;
  background-position: 100% 0;
  -webkit-background-clip: text;
  background-clip: text;
  opacity: 0;
  filter: drop-shadow(0 2px 8px color-mix(in srgb, var(--border) 25%, transparent));
  animation:
    slogan_fadein 1s ease        forwards var(--s-delay, 1.4s),
    metal_shine   2.4s ease-in-out 1 var(--s-shine, 2s) forwards;
}

@keyframes slogan_fadein {
  0%   { opacity: 0; transform: translateY(16px) scale(0.96); filter: blur(6px); }
  60%  { filter: blur(0); }
  100% { opacity: 1; transform: translateY(0) scale(1); }
}

/* 밝은 띠 1개만 — 천천히 한 번 지나간 뒤 진한 톤 고정 */
@keyframes metal_shine {
  0%   { background-position: 100% 0; }
  28%  { background-position: 100% 0; }
  62%  { background-position: 0% 0; }
  100% { background-position: 100% 0; }
}

/* 슬로건 두 번째 줄: 약간 더 늦게 */
.intro_slogan_line:nth-child(2) {
  font-size: clamp(11px, 2.6vw, 34px);
  letter-spacing: 0.35em;
  --s-delay: 1.7s;
  --s-shine: 2.3s;
}

/* ─── NOVASM 텍스트 로고 전환 ───────────
   슬로건이 축소·블러되며 사라지는 동안
   같은 중앙 위치에서 NOVA SM 텍스트가 확장하며 등장
─────────────────────────────────────── */
.intro_logo_wrap {
  position: absolute;
  inset: 0;
  z-index: 6;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.1em;
  padding: 0 var(--intro-pad-x);
  opacity: 0;
  pointer-events: none;
  /* 등장(5.0s) → 유지 → 도시 씬 전 페이드아웃(8.2s) */
  animation:
    logo_appear 1.1s cubic-bezier(0.2, 0, 0.1, 1) forwards 5.0s,
    logo_hide   0.55s ease-in forwards 8.2s;
}

@keyframes logo_appear {
  0%   { opacity: 0; transform: scale(1.15); filter: blur(14px); }
  50%  { opacity: 1; filter: blur(3px); }
  100% { opacity: 1; transform: scale(1); filter: blur(0); }
}

@keyframes logo_hide {
  0%   { opacity: 1; transform: scale(1); filter: blur(0); visibility: visible; }
  100% { opacity: 0; transform: scale(1.06); filter: blur(10px); visibility: hidden; }
}

/* NOVA — 큰 세리프 + V 발광 코어 */
.intro_logo_nova {
  font-family: "Playfair", serif;
  font-size: clamp(36px, 11vw, 140px);
  font-weight: 600;
  letter-spacing: 0.35em;
  line-height: 1;
  max-width: 100%;
  text-align: center;
  position: relative;
  filter: drop-shadow(0 4px 20px color-mix(in srgb, var(--border) 30%, transparent));
}

.intro_logo_nova,
.intro_logo_nova > span {
  color: transparent;
  background: linear-gradient(
    110deg,
    var(--metal-dark) 0%,
    var(--metal-dark) 42%,
    var(--metal-bright) 50%,
    var(--metal-dark) 58%,
    var(--metal-dark) 100%
  );
  background-size: 220% 100%;
  background-position: 100% 0;
  -webkit-background-clip: text;
  background-clip: text;
  animation: logo_shine_sweep 2s ease-in-out forwards 5.2s;
}

/* V 글자 — 발광 코어가 글자 뒤에 오도록 */
.intro_logo_v {
  position: relative;
  display: inline-block;
  isolation: isolate;
}

.intro_logo_v_core {
  position: absolute;
  top: 50%;
  left: 50%;
  width: var(--intro-v-core);
  height: var(--intro-v-core);
  border-radius: 50%;
  pointer-events: none;
  z-index: -1;
  background: radial-gradient(
    circle,
    rgba(255, 255, 255, 0.85) 0%,
    rgba(255, 248, 200, 0.55) 25%,
    color-mix(in srgb, var(--border) 40%, transparent) 55%,
    transparent 75%
  );
  filter: blur(12px);
  opacity: 0;
  transform: translate(-50%, -50%);
  animation: logo_v_core 1.4s ease-out forwards 5.4s;
}

@keyframes logo_v_core {
  0%   { opacity: 0; transform: translate(-50%, -50%) scale(0.2); }
  30%  { opacity: 1; transform: translate(-50%, -50%) scale(1.8); filter: blur(10px) brightness(2.5); }
  60%  { opacity: 0.6; transform: translate(-50%, -50%) scale(1); }
  100% { opacity: 0; transform: translate(-50%, -50%) scale(0.5); }
}

/* SM — 작은 서브 텍스트 */
.intro_logo_sm {
  font-family: "Playfair", serif;
  font-size: clamp(12px, 3vw, 38px);
  font-weight: 300;
  letter-spacing: 0.9em;
  max-width: 100%;
  text-align: center;
  color: transparent;
  background: linear-gradient(
    110deg,
    var(--metal-dark) 0%,
    var(--metal-dark) 42%,
    var(--metal-bright) 50%,
    var(--metal-dark) 58%,
    var(--metal-dark) 100%
  );
  background-size: 220% 100%;
  background-position: 100% 0;
  -webkit-background-clip: text;
  background-clip: text;
  animation: logo_shine_sweep 2s ease-in-out forwards 5.2s;

  text-shadow:
    0 0 14px color-mix(in srgb, var(--border) 40%, transparent);
}

/* 등장 시 한 번 번쩍인 뒤 진한 톤 유지 */
@keyframes logo_shine_sweep {
  0%   { background-position: 100% 0; }
  28%  { background-position: 100% 0; }
  62%  { background-position: 0% 0; }
  100% { background-position: 100% 0; }
}

/* 로고 등장 순간 골드 라이트 버스트 */
.intro_logo_burst {
  position: absolute;
  width: var(--intro-logo-burst);
  height: var(--intro-logo-burst);
  border-radius: 50%;
  z-index: 5;
  background: radial-gradient(
    circle,
    rgba(255, 255, 255, 0.7) 0%,
    rgba(255, 252, 220, 0.5) 15%,
    var(--g20) 35%,
    transparent 70%
  );
  filter: blur(36px);
  opacity: 0;
  pointer-events: none;
  animation: logo_burst 1.6s ease-out forwards 5.0s;
}

@keyframes logo_burst {
  0%   { opacity: 0; transform: scale(0.2); }
  20%  { opacity: 1; transform: scale(1.1); filter: blur(28px) brightness(2); }
  45%  { opacity: 0.7; transform: scale(1.4); }
  100% { opacity: 0; transform: scale(2); }
}

/* ─── 도시 몽타주: 단일 영상 + 지역 라벨 전환 ── */
.intro_cities {
  position: absolute;
  inset: 0;
  z-index: 8;
  opacity: 0;
  pointer-events: none;
  background: #111;
  animation:
    cities_show 0.6s ease forwards 8.5s,
    cities_hide 0.5s ease forwards 10.75s;
}

.intro_city_slot {
  position: absolute;
  inset: 0;
  overflow: hidden;
}

.intro_city_video {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.9) contrast(1.03);
  transform: scale(1.02);
  will-change: auto;
}

/* 지역명 라벨 */
.intro_city_label {
  position: absolute;
  bottom: 36px;
  left: 50%;
  transform: translateX(-50%);
  font-family: "Playfair", serif;
  font-size: 12px;
  letter-spacing: 0.45em;
  color: rgba(212, 175, 94, 0.85);
  text-shadow: 0 0 20px rgba(0, 0, 0, 0.8);
  white-space: nowrap;
  z-index: 2;
  opacity: 1;
  transition: opacity 0.2s ease;
}

.intro_city_label--fade {
  opacity: 0;
}

@keyframes cities_show {
  from { opacity: 0; }
  to   { opacity: 1; }
}

@keyframes cities_hide {
  to { opacity: 0; visibility: hidden; }
}

/* 의료 장면: 밝고 클리니컬한 톤 */
.intro_medical {
  position: absolute;
  inset: 0;
  z-index: 9;
  display: flex;
  align-items: stretch;
  opacity: 0;
  pointer-events: none;
  animation:
    med_show 0.4s ease forwards 11.2s,
    med_hide 0.55s ease forwards 18.6s;
}

@keyframes med_show {
  to { opacity: 1; }
}

@keyframes med_hide {
  to { opacity: 0; visibility: hidden; }
}

.intro_med_panel {
  flex: 1;
  position: relative;
  overflow: hidden;
  background: #0d0d0d;
}

/* 각 패널이 위에서 아래로 슬라이드 인 */
.intro_med_panel:nth-child(1) { animation: panel_drop 0.6s cubic-bezier(0.3,0,0.2,1) forwards 11.3s; transform: translateY(-100%); }
.intro_med_panel:nth-child(2) { animation: panel_drop 0.6s cubic-bezier(0.3,0,0.2,1) forwards 11.55s; transform: translateY(-100%); }
.intro_med_panel:nth-child(3) { animation: panel_drop 0.6s cubic-bezier(0.3,0,0.2,1) forwards 11.8s; transform: translateY(-100%); }
.intro_med_panel:nth-child(4) { animation: panel_drop 0.6s cubic-bezier(0.3,0,0.2,1) forwards 12.05s; transform: translateY(-100%); }

@keyframes panel_drop {
  to { transform: translateY(0); }
}

/* 패널 내 비디오: 패널을 꽉 채우고 object-fit cover */
.intro_med_video {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: brightness(1.08) contrast(1.02);
}

/* 패널 내 라벨 */
.intro_med_panel::after {
  content: attr(data-label);
  position: absolute;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%);
  font-family: "Playfair", serif;
  font-size: 11px;
  letter-spacing: 0.25em;
  color: var(--g60);
  white-space: nowrap;
}

/* 각 패널 배경 (영상 대용) */
.intro_med_panel:nth-child(1) { background: linear-gradient(180deg, #1a1208 0%, #0d0d0d 100%); }
.intro_med_panel:nth-child(2) { background: linear-gradient(180deg, #080f12 0%, #0d0d0d 100%); }
.intro_med_panel:nth-child(3) { background: linear-gradient(180deg, #100810 0%, #0d0d0d 100%); }
.intro_med_panel:nth-child(4) { background: linear-gradient(180deg, #0a0f08 0%, #0d0d0d 100%); }

/* 패널 구분 골드 라인 */
.intro_med_panel + .intro_med_panel {
  border-left: 1px solid var(--g20);
}

/* ─── 한중 지도 섹션 ────────────────── */
.intro_map {
  position: absolute;
  inset: 0;
  z-index: 10;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: radial-gradient(ellipse 85% 75% at 50% 42%, #f0f0f0 0%, #e0e0e0 100%);
  opacity: 0;
  pointer-events: none;
  animation:
    map_show 0.8s ease forwards 13.2s,
    map_hide 0.65s ease forwards 18.8s;
}

@keyframes map_show {
  to { opacity: 1; }
}

@keyframes map_hide {
  to { opacity: 0; visibility: hidden; }
}

/* SVG 지도 래퍼 */
.intro_map_figure {
  position: relative;
  width: clamp(300px, 58vw, 900px);
}

/* 통합 SVG 지도 — 네이티브 1407×802 해상도로 선명하게 렌더 */
.intro_map_svg {
  width: 100%;
  height: auto;
  display: block;
  opacity: 0;
  shape-rendering: geometricPrecision;
  animation: map_img_in 1s ease forwards 13.5s;
}

@keyframes map_img_in {
  0%   { opacity: 0; transform: scale(0.94); }
  100% { opacity: 1; transform: scale(1); }
}

/* 골드 연결선 — 글로우 레이어 */
.intro_map_gold_glow {
  stroke-dasharray: 620;
  stroke-dashoffset: 620;
  filter: blur(4px);
  animation:
    map_glow_in 0.6s ease forwards 15.6s,
    draw_line   1.6s ease forwards 15.8s;
}

@keyframes map_glow_in {
  to { opacity: 0.35; }
}

/* 골드 연결선 — 메인 레이어 */
.intro_map_gold_path {
  fill: none;
  stroke: url(#introGoldGrad);
  stroke-width: 2.8;
  stroke-linecap: round;
  stroke-dasharray: 620;
  stroke-dashoffset: 620;
  filter: drop-shadow(0 1px 2px rgba(138, 112, 64, 0.35))
          drop-shadow(0 0 8px color-mix(in srgb, var(--border) 50%, transparent));
  animation: draw_line 1.6s ease forwards 15.8s;
}

@keyframes draw_line {
  to { stroke-dashoffset: 0; }
}

/* 서울 노드 — 링 + 글로우 + 코어 */
.intro_map_dot {
  animation: map_dot 0.45s cubic-bezier(0.22, 1, 0.36, 1) forwards 15.4s;
}

.intro_map_dot_glow {
  animation: map_dot_glow 0.5s ease forwards 15.4s;
}

.intro_map_dot_ring {
  animation: map_dot_ring 0.5s ease forwards 15.5s;
}

/* 베이징 노드 — company 도시 노드 스타일 (골드) */
.intro_map_city_dot {
  animation: intro_city_dot_in 0.55s ease forwards 15.45s;
}

@keyframes intro_city_dot_in {
  from { opacity: 0; }
  to   { opacity: 0.95; }
}

@keyframes map_dot_glow {
  0%   { opacity: 0; r: 4; }
  100% { opacity: 0.25; r: 14; }
}

@keyframes map_dot_ring {
  0%   { opacity: 0; r: 5; }
  100% { opacity: 0.6; r: 11; }
}

/* 지도 하단 텍스트 */
.intro_map_tagline {
  position: absolute;
  bottom: clamp(30px, 6vh, 80px);
  left: 50%;
  transform: translateX(-50%);
  font-family: "Playfair", serif;
  font-size: clamp(13px, 2vw, 22px);
  font-weight: 400;
  letter-spacing: 0.38em;
  line-height: 1.85;
  text-align: center;
  color: transparent;
  background: linear-gradient(
    110deg,
    var(--metal-dark) 0%,
    var(--metal-dark) 38%,
    var(--metal-bright) 48%,
    #c9a84c 52%,
    var(--metal-dark) 62%,
    var(--metal-dark) 100%
  );
  background-size: 240% 100%;
  background-position: 100% 0;
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  white-space: normal;
  opacity: 0;
  animation:
    tagline_in  0.8s ease             forwards 14.0s,
    metal_shine 2.6s ease-in-out 1    forwards 14.6s;
}

@keyframes tagline_in {
  0%   { opacity: 0; letter-spacing: 0.6em; }
  100% { opacity: 1; letter-spacing: 0.4em; }
}

/* ─── 최종 로고 씬: 파티클 수렴 → 로고 형성 ── */
.intro_final {
  position: absolute;
  inset: 0;
  z-index: 11;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #ececec;
  opacity: 0;
  pointer-events: none;
  animation: final_show 0.7s ease forwards 19.0s;
}

.intro_final_logo_wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  z-index: 2;
  padding: 0 var(--intro-pad-x);
  max-width: 100%;
}

.intro_final_tagline {
  font-family: "Playfair", serif;
  font-size: clamp(9px, 2.4vw, 15px);
  letter-spacing: 0.28em;
  text-align: center;
  max-width: 92vw;
  line-height: 1.5;
  color: color-mix(in srgb, var(--border) 80%, #333);
  opacity: 0;
  animation: final_tagline_in 0.8s ease forwards 20.75s;
}

@keyframes final_tagline_in {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes final_show {
  to { opacity: 1; }
}

/* 최종 로고 — 파티클 수렴 완료 후 등장 */
.intro_final_logo {
  width: clamp(160px, 62vw, 460px);
  max-width: 100%;
  height: auto;
  opacity: 0;
  transform: scale(0.82);
  filter: blur(10px);
  animation: final_logo_in 1s cubic-bezier(0.2, 0, 0.1, 1) forwards 20.05s;
}

@keyframes final_logo_in {
  0%   { opacity: 0; transform: scale(0.82); filter: blur(10px); }
  45%  { opacity: 0.85; filter: blur(2px); }
  100% { opacity: 1; transform: scale(1); filter: blur(0); }
}

/* 최종 파티클 수렴 효과 */
.intro_converge_particle {
  position: absolute;
  border-radius: 50%;
  width: var(--sz, 4px);
  height: var(--sz, 4px);
  background: radial-gradient(circle, #ffffff 0%, #f5e6a8 38%, #c9a84c 100%);
  top: var(--py, 50%);
  left: var(--px, 50%);
  opacity: 0;
  z-index: 3;
  box-shadow: 0 0 4px 1px rgba(255, 248, 210, 0.95);
  animation: converge_move var(--dur, 0.85s) cubic-bezier(0.58, 0, 0.92, 0.32) forwards var(--cd, 19.0s);
  pointer-events: none;
  will-change: transform, opacity;
}

.intro_converge_particle--bright {
  background: radial-gradient(circle, #ffffff 0%, #fff8d0 28%, #e8c96a 62%, #b8943a 100%);
  box-shadow:
    0 0 6px 2px rgba(255, 252, 230, 1),
    0 0 12px 3px rgba(232, 201, 106, 0.55);
}

.intro_converge_particle--streak {
  border-radius: 999px;
  width: calc(var(--sz) * 5);
  height: max(2px, calc(var(--sz) * 0.45));
  background: linear-gradient(
    90deg,
    transparent 0%,
    rgba(255, 248, 200, 0.5) 30%,
    #fffef0 50%,
    rgba(255, 248, 200, 0.5) 70%,
    transparent 100%
  );
  box-shadow: 0 0 5px 1px rgba(255, 252, 220, 0.9);
}

@keyframes converge_move {
  0%   { opacity: 0; transform: translate(0, 0) scale(1); }
  6%   { opacity: 1; }
  88%  { opacity: 0.98; }
  100% { opacity: 0; transform: translate(var(--cx, 0px), var(--cy, 0px)) scale(0.02); }
}

/* 최종 글로우 버스트 — 파티클이 모인 직후 */
.intro_final_glow {
  position: absolute;
  width: var(--intro-final-glow);
  height: var(--intro-final-glow);
  border-radius: 50%;
  background: radial-gradient(circle, var(--g60) 0%, transparent 70%);
  opacity: 0;
  z-index: 1;
  animation: glow_burst 1.2s ease-out forwards 19.95s;
  pointer-events: none;
}

@keyframes glow_burst {
  0%   { opacity: 0; transform: scale(0.2); }
  30%  { opacity: 1; }
  100% { opacity: 0; transform: scale(3); }
}

/* 지도 마커 점 나타나기 */
@keyframes map_dot {
  0%   { opacity: 0; r: 2; }
  70%  { opacity: 1; r: 6; }
  100% { opacity: 1; r: 5; }
}

/* ─── 건너뛰기 버튼 ─────────────────── */
.intro_skip {
  position: fixed;
  bottom: max(24px, env(safe-area-inset-bottom, 0px));
  right: max(20px, env(safe-area-inset-right, 0px));
  z-index: 10000;
  font-family: "Playfair", serif;
  font-size: 12px;
  letter-spacing: 0.2em;
  color: rgba(150, 120, 60, 0.7);
  background: none;
  border: none;
  cursor: pointer;
  padding: 12px 4px;
  min-height: 44px;
  min-width: 44px;
  transition: color 0.2s;
}

.intro_skip:hover {
  color: rgba(212, 175, 94, 1);
}

/* ═══════════════════════════════════
   INTRO 반응형 — 태블릿 / 모바일
═══════════════════════════════════ */

/* ── 1024px 이하: 태블릿 ── */
@media (max-width: 1024px) {
  #intro_overlay {
    --intro-pad-x: clamp(20px, 4vw, 40px);
  }

  .intro_map_figure {
    width: clamp(260px, 72vw, 820px);
  }

  .intro_map_tagline {
    letter-spacing: 0.28em;
    font-size: clamp(12px, 2.2vw, 20px);
  }
}

/* ── 768px 이하: 태블릿 세로 ── */
@media (max-width: 768px) {
  #intro_overlay {
    --intro-core-bloom: clamp(120px, 44vw, 240px);
    --intro-haze-outer-w: clamp(260px, 88vw, 560px);
    --intro-beam-line: min(720px, 150vw);
    --intro-ghost-line: min(520px, 72vw);
  }

  .intro_anamorphic {
    width: 88vw;
  }

  @keyframes anamorphic_pulse {
    0%, 30%  { opacity: 0; transform: translate(-50%, -50%) scaleX(0.3); }
    48%      { opacity: 1; transform: translate(-50%, -50%) scaleX(1); }
    55%      { opacity: 1; transform: translate(-50%, -50%) scaleX(1.08); filter: brightness(1.8); }
    68%      { opacity: 0.15; transform: translate(-50%, -50%) scaleX(0.7); }
    100%     { opacity: 0; transform: translate(-50%, -50%) scaleX(0.4); }
  }

  .intro_slogan_line {
    letter-spacing: 0.14em;
  }

  .intro_slogan_line:nth-child(2) {
    letter-spacing: 0.22em;
  }

  .intro_logo_nova {
    letter-spacing: 0.22em;
  }

  .intro_logo_sm {
    letter-spacing: 0.55em;
  }

  /* 의료 패널: 4열 → 2×2 그리드 */
  .intro_medical {
    flex-wrap: wrap;
  }

  .intro_med_panel {
    flex: 0 0 50%;
    height: 50%;
  }

  .intro_med_panel + .intro_med_panel {
    border-left: none;
  }

  .intro_med_panel:nth-child(odd) {
    border-right: 1px solid var(--g20);
  }

  .intro_med_panel:nth-child(-n+2) {
    border-bottom: 1px solid var(--g20);
  }

  .intro_med_panel::after {
    bottom: 14px;
    font-size: 10px;
    letter-spacing: 0.14em;
    max-width: 90%;
    white-space: normal;
    text-align: center;
    line-height: 1.4;
  }

  .intro_map_figure {
    width: clamp(240px, 84vw, 820px);
  }

  .intro_map_tagline {
    letter-spacing: 0.18em;
    font-size: clamp(11px, 2.8vw, 18px);
    bottom: clamp(20px, 5vh, 60px);
  }

  .intro_city_label {
    bottom: max(20px, env(safe-area-inset-bottom, 0px));
    font-size: 11px;
    letter-spacing: 0.3em;
  }
}

/* ── 480px 이하: 모바일 ── */
@media (max-width: 480px) {
  #intro_overlay {
    --intro-pad-x: 16px;
    --intro-core-gold: clamp(64px, 26vw, 120px);
    --intro-core-bloom: clamp(96px, 36vw, 180px);
    --intro-haze-w: clamp(150px, 42vw, 280px);
    --intro-haze-outer-w: clamp(200px, 62vw, 400px);
    --intro-logo-burst: clamp(220px, 95vmin, 420px);
    --intro-v-core: clamp(28px, 9vw, 56px);
    --intro-beam-line: min(480px, 128vw);
    --intro-ghost-line: min(360px, 58vw);
  }

  .intro_anamorphic {
    width: 68vw;
    box-shadow:
      0 0 14px 3px rgba(255, 252, 220, 0.45),
      0 0 40px 8px color-mix(in srgb, var(--border) 28%, transparent),
      0 0 80px 20px color-mix(in srgb, var(--border) 8%, transparent);
  }

  @keyframes core_gold {
    0%, 38%  { opacity: 0; transform: translate(-50%, -50%) scale(0.3); }
    50%      { opacity: 0.85; transform: translate(-50%, -50%) scale(1.6); filter: blur(14px) brightness(1.8); }
    56%      { opacity: 0.95; transform: translate(-50%, -50%) scale(2.2); filter: blur(10px) brightness(2.4); }
    68%      { opacity: 0.35; transform: translate(-50%, -50%) scale(1.2); }
    100%     { opacity: 0; transform: translate(-50%, -50%) scale(0.4); }
  }

  @keyframes core_bloom {
    0%, 36%  { opacity: 0; transform: translate(-50%, -50%) scale(0.4); }
    52%      { opacity: 0.7; transform: translate(-50%, -50%) scale(1.8); }
    58%      { opacity: 0.85; transform: translate(-50%, -50%) scale(2.6); filter: blur(32px) brightness(1.4); }
    75%      { opacity: 0.12; transform: translate(-50%, -50%) scale(1); }
    100%     { opacity: 0; transform: translate(-50%, -50%) scale(0.5); }
  }

  .intro_core--bloom {
    box-shadow:
      0 0 50px 24px rgba(255, 252, 220, 0.35),
      0 0 100px 48px color-mix(in srgb, var(--border) 18%, transparent);
  }

  .intro_beam::after {
    box-shadow:
      0 0 8px 2px rgba(255, 252, 220, 0.5),
      0 0 24px 5px color-mix(in srgb, var(--border) 30%, transparent);
  }

  .intro_slogan {
    gap: 0.55em;
  }

  .intro_slogan_line {
    letter-spacing: 0.08em;
    font-size: clamp(11px, 4.6vw, 28px);
  }

  .intro_slogan_line:nth-child(2) {
    letter-spacing: 0.14em;
    font-size: clamp(10px, 3.6vw, 20px);
  }

  .intro_logo_nova {
    font-size: clamp(28px, 14vw, 72px);
    letter-spacing: 0.1em;
    padding-right: 0.1em;
  }

  .intro_logo_sm {
    letter-spacing: 0.38em;
    font-size: clamp(10px, 3.8vw, 22px);
  }

  .intro_map_figure {
    width: 92vw;
  }

  .intro_map_tagline {
    letter-spacing: 0.08em;
    font-size: clamp(10px, 3.2vw, 14px);
    white-space: normal;
    max-width: 92vw;
    padding: 0 8px;
    line-height: 1.7;
  }

  .intro_final_tagline {
    letter-spacing: 0.14em;
    font-size: clamp(8px, 2.8vw, 12px);
  }

  .intro_skip {
    right: max(16px, env(safe-area-inset-right, 0px));
    bottom: max(16px, env(safe-area-inset-bottom, 0px));
    font-size: 11px;
  }

  .intro_city_label {
    font-size: 10px;
    letter-spacing: 0.22em;
    max-width: 92vw;
    text-align: center;
  }

  .intro_med_panel::after {
    bottom: 10px;
    font-size: 9px;
    letter-spacing: 0.08em;
  }
}

/* ── 360px 이하: 소형 모바일 ── */
@media (max-width: 360px) {
  .intro_med_panel {
    flex: 0 0 100%;
    height: 25%;
  }

  .intro_med_panel:nth-child(odd) {
    border-right: none;
  }

  .intro_med_panel:nth-child(-n+3) {
    border-bottom: 1px solid var(--g20);
  }

  .intro_logo_nova {
    letter-spacing: 0.1em;
  }

  .intro_logo_sm {
    letter-spacing: 0.28em;
  }

  .intro_slogan_line {
    letter-spacing: 0.05em;
  }
}

/* ── 가로 모드 + 낮은 높이: 텍스트·지도 겹침 방지 ── */
@media (max-height: 520px) and (orientation: landscape) {
  .intro_slogan,
  .intro_logo_wrap {
    justify-content: center;
    padding-top: 8px;
    padding-bottom: 8px;
  }

  .intro_slogan_line {
    font-size: clamp(10px, 3.2vh, 22px);
  }

  .intro_slogan_line:nth-child(2) {
    font-size: clamp(9px, 2.6vh, 16px);
  }

  .intro_logo_nova {
    font-size: clamp(24px, 10vh, 64px);
  }

  .intro_logo_sm {
    font-size: clamp(9px, 2.8vh, 18px);
  }

  .intro_map {
    justify-content: flex-start;
    padding-top: 12px;
  }

  .intro_map_figure {
    width: min(52vh, 72vw);
  }

  .intro_map_tagline {
    position: relative;
    bottom: auto;
    left: auto;
    transform: none;
    margin-top: 10px;
    font-size: clamp(9px, 2.4vh, 13px);
  }

  .intro_final_logo {
    width: clamp(120px, 38vh, 280px);
  }

  .intro_skip {
    bottom: max(8px, env(safe-area-inset-bottom, 0px));
    right: max(12px, env(safe-area-inset-right, 0px));
  }
}

/* ── 애니메이션 축소 선호 시 빔·파티클만 완화 ── */
@media (prefers-reduced-motion: reduce) {
  .intro_particle,
  .intro_particle--streak,
  .intro_converge_particle,
  .intro_ghost {
    display: none;
  }

  .intro_beam,
  .intro_beam::before,
  .intro_beam::after,
  .intro_anamorphic,
  .intro_core,
  .intro_haze,
  .intro_screen_flash,
  .intro_ray {
    animation-duration: 0.01ms !important;
  }
}