:root {
  color-scheme: dark;
  /* 공통 디자인 토큰: 메뉴 / How to Play / 게임 HUD가 같은 색, 같은 반투명 UI를 쓴다 */
  --ink: #e1f5fa;                          /* pale cyan-white (interaction marker와 같은 색) */
  --ink-dim: rgba(225, 245, 250, 0.62);
  --line: rgba(225, 245, 250, 0.18);
  --coral: #f08078;
  --gold: #e8c46e;
  --mint: #8cd0aa;
  --radius: 18px;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }

body {
  margin: 0;
  min-height: 100vh;
  background: #0b1824;
  color: var(--ink);
  font-family: system-ui, -apple-system, "Segoe UI", "Apple SD Gothic Neo", "Malgun Gothic", sans-serif;
  overflow-x: hidden;
}

/* ---------- 게임 세계 배경: 깊은 바다 + 은은한 색 번짐 + 가장자리 어둡게 ---------- */
.backdrop {
  position: fixed;
  inset: 0;
  z-index: -3;
  background: radial-gradient(120% 90% at 50% 0%, #1b3a4f 0%, #0f2232 55%, #0a141e 100%);
  overflow: hidden;
}
.orb { position: absolute; border-radius: 50%; filter: blur(70px); opacity: 0.18; }
.orb.coral { width: 38vmax; height: 38vmax; left: -12vmax; bottom: -14vmax; background: var(--coral); }
.orb.gold { width: 30vmax; height: 30vmax; right: -8vmax; top: 8vh; background: var(--gold); opacity: 0.12; }
.orb.mint { width: 34vmax; height: 34vmax; right: 12vw; bottom: -18vmax; background: var(--mint); opacity: 0.14; }
#ambient { position: fixed; inset: 0; width: 100vw; height: 100vh; z-index: -2; pointer-events: none; }
.vignette { position: fixed; inset: 0; z-index: -1; pointer-events: none; background: radial-gradient(ellipse at 50% 45%, transparent 45%, rgba(3, 9, 15, 0.62) 100%); }
#fx { position: fixed; inset: 0; width: 100vw; height: 100vh; z-index: 50; pointer-events: none; }
body[data-screen="game"] #ambient, body[data-screen="game"] .vignette, body[data-screen="game"] #fx { display: none; }

main {
  min-height: 100vh;
  width: 100%;
  max-width: 1000px;
  margin: 0 auto;
  padding: 24px 16px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 14px;
}

/* ---------- 화면 (카드 없이 장면 위에 바로 놓음) ---------- */
.screen {
  width: min(720px, 100%);
  text-align: center;
  animation: rise 0.6s ease both;
  text-shadow: 0 2px 14px rgba(3, 9, 15, 0.7);
}
@keyframes rise { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: none; } }

.logo {
  margin: 0;
  font-size: clamp(42px, 11vw, 92px);
  font-weight: 600;
  letter-spacing: 0.2em;
  padding-left: 0.2em;       /* letter-spacing 때문에 오른쪽으로 쏠리는 것 보정 */
  line-height: 1.05;
  text-shadow: 0 0 36px rgba(225, 245, 250, 0.35), 0 2px 18px rgba(3, 9, 15, 0.6);
  animation: titleFloat 6s ease-in-out infinite;
}
@keyframes titleFloat { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-5px); } }
.heading { margin: 0 0 8px; font-size: clamp(16px, 3vw, 20px); font-weight: 500; letter-spacing: 0.3em; padding-left: 0.3em; color: var(--ink-dim); }
.lead { margin: 16px 0 6px; color: var(--ink-dim); font-size: clamp(15px, 2.8vw, 19px); letter-spacing: 0.08em; }
.note { margin: 18px 0 0; font-size: 12px; letter-spacing: 0.14em; color: var(--ink-dim); opacity: 0.75; }
.note.tip { margin: 6px 0 8px; font-size: 13px; letter-spacing: 0.04em; }
.msg { margin: 8px 0 0; line-height: 1.6; font-size: clamp(15px, 2.8vw, 18px); }

/* ---------- 물고기 버튼 ---------- */
.fishmenu { display: flex; flex-direction: column; align-items: center; gap: 4px; margin-top: 18px; }
.fishmenu.row { flex-direction: row; justify-content: center; flex-wrap: wrap; gap: 8px 64px; margin-top: 14px; }   /* 꼬리끼리 닿지 않게 넉넉히 */
/* 메뉴의 두 물고기는 일렬로 서지 않고 살짝 어긋나게 헤엄치는 느낌 */
#playBtn { margin-right: 36px; }
#howtoBtn { margin-left: 28px; }

.fishbtn {
  --w: 200px;
  --flip: 1;
  --c: var(--coral);
  --glow: rgba(240, 128, 120, 0.55);
  position: relative;
  display: block;
  width: var(--w);
  aspect-ratio: 260 / 110;
  padding: 0;
  border: 0;
  background: none;
  color: var(--ink);
  font: inherit;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
  text-shadow: 0 1px 6px rgba(3, 9, 15, 0.6);
}
.fishbtn.coral { --c: var(--coral); --glow: rgba(240, 128, 120, 0.55); }
.fishbtn.gold { --c: var(--gold); --glow: rgba(232, 196, 110, 0.5); }
.fishbtn.mint { --c: var(--mint); --glow: rgba(140, 208, 170, 0.5); }
.fishbtn.big { --w: 260px; font-size: 22px; }
.fishbtn.mid { --w: 210px; font-size: 16px; }
.fishbtn.small { --w: 150px; font-size: 15px; }
.fishbtn.flip { --flip: -1; }

/* 둥둥 떠 있는 움직임 (버튼마다 시작 위상이 달라 같이 움직이지 않음) */
.wob { position: absolute; inset: 0; display: block; animation: bob 4.6s ease-in-out infinite; animation-delay: var(--d, 0s); }
@keyframes bob { 0%, 100% { transform: translateY(0) rotate(0); } 50% { transform: translateY(-5px) rotate(-1deg); } }

.fishbtn svg {
  position: absolute; inset: 0; width: 100%; height: 100%;
  overflow: visible;
  fill: var(--c);
  opacity: 0.62;                 /* 몸통과 꼬리가 겹치는 곳이 진해지지 않도록 개별 fill-opacity가 아니라 svg 전체에 투명도 */
  filter: drop-shadow(0 0 10px var(--glow));
  transform: scaleX(var(--flip));
  transition: transform 0.35s cubic-bezier(.2, .9, .3, 1.2), filter 0.3s ease, opacity 0.3s ease;
}
.tail { transform-origin: 74px 55px; animation: wag 2s ease-in-out infinite; animation-delay: var(--d, 0s); }
@keyframes wag { 0%, 100% { transform: rotate(-5deg); } 50% { transform: rotate(6deg); } }

.label {
  position: absolute; top: 50%; left: 21%; right: 6%;
  transform: translateY(-52%);
  text-align: center; white-space: nowrap;
  font-weight: 500; letter-spacing: 0.08em;
}
.fishbtn.flip .label { left: 6%; right: 21%; }

/* hover: 살짝 떠올라 기울고, 꼬리가 빨라지고, glow가 밝아짐 */
.fishbtn:hover svg, .fishbtn:focus-visible svg {
  transform: translateY(-3px) rotate(calc(-2.5deg * var(--flip))) scale(calc(1.05 * var(--flip)), 1.05);
  filter: drop-shadow(0 0 20px var(--glow)) brightness(1.15);
  opacity: 0.85;
}
.fishbtn:hover .tail, .fishbtn:focus-visible .tail { animation-duration: 0.4s; }
.fishbtn:focus-visible { outline: none; }
.fishbtn:focus-visible .label { text-decoration: underline; text-underline-offset: 5px; text-decoration-thickness: 1px; }
/* 누르는 순간: 꾹 눌렸다가 통통 튀어오름 */
.fishbtn.pressed .wob { animation: squish 0.34s ease-out; }
@keyframes squish { 0% { transform: scale(1); } 30% { transform: scale(0.92, 1.06); } 65% { transform: scale(1.05, 0.96); } 100% { transform: scale(1); } }

/* ---------- How to Play: 세 단계가 물결선을 따라 이어짐 ---------- */
.flow { position: relative; width: min(640px, 100%); margin: 18px auto 26px; }
.flowline { position: absolute; left: 0; top: 0; width: 100%; height: auto; aspect-ratio: 640 / 76; overflow: visible; pointer-events: none; }
.nodes { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(3, 1fr); position: relative; }
.node { display: flex; flex-direction: column; align-items: center; gap: 6px; --accent: var(--ink); }
.node.coral { --accent: var(--coral); }
.node.gold { --accent: var(--gold); }
.node.mint { --accent: var(--mint); }
.bubble {
  width: 76px; height: 76px; border-radius: 50%;
  display: grid; place-items: center;
  border: 1px solid color-mix(in srgb, var(--accent) 55%, transparent);
  background: radial-gradient(circle at 35% 30%, color-mix(in srgb, var(--accent) 26%, transparent), color-mix(in srgb, var(--accent) 8%, transparent) 70%);
  box-shadow: 0 0 26px color-mix(in srgb, var(--accent) 22%, transparent);
  animation: bubbleFloat 5s ease-in-out infinite;
}
.node:nth-child(2) .bubble { animation-delay: -1.6s; }
.node:nth-child(3) .bubble { animation-delay: -3.2s; }
@keyframes bubbleFloat { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-5px); } }
.bubble svg { width: 32px; height: 32px; fill: none; stroke: var(--accent); stroke-width: 1.5; stroke-linecap: round; stroke-linejoin: round; }
.node b { margin-top: 6px; font-size: 15px; letter-spacing: 0.2em; padding-left: 0.2em; }
.node .desc { font-size: 13.5px; line-height: 1.65; color: var(--ink-dim); }

/* ---------- 로딩 / 오류 ---------- */
.pulse {
  width: 46px; height: 46px; margin: 0 auto 12px;
  border-radius: 50%;
  border: 1px solid rgba(225, 245, 250, 0.5);
  animation: breathe 1.6s ease-in-out infinite;
}
.screen.error .pulse { animation: none; border-color: rgba(240, 128, 120, 0.7); }
.screen.error .msg { color: #f6b3ad; }
@keyframes breathe { 0%, 100% { transform: scale(0.8); opacity: 0.35; } 50% { transform: scale(1.12); opacity: 0.9; } }

/* ---------- 게임 화면 ---------- */
/* video와 canvas를 같은 크기로 겹치고, 거울처럼 좌우 반전 (canvas 좌표를 따로 뒤집을 필요 없음) */
#stage {
  position: relative;
  width: 100%;
  max-width: 960px;
  aspect-ratio: 4 / 3;
  background: #000;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  animation: rise 0.45s ease both;
}
#video, #warp, #overlay {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transform: scaleX(-1);
}
/* WebGL warp canvas는 face morph 효과 중에만 보임 (video, overlay와 같이 좌우 반전) */
#warp { visibility: hidden; }

/* 게임 UI (HTML): 얇고 반투명한 텍스트만, 과한 HUD 느낌 없이 */
#hud, #banner, #debugGame {
  position: absolute;
  z-index: 2;
  pointer-events: none;
  color: var(--ink);
  text-shadow: 0 1px 3px rgba(0, 0, 0, 0.45);
}
#hud {
  top: 14px;
  left: 20px;
  right: 20px;
  display: flex;
  justify-content: space-between;
  font-size: clamp(13px, 2.2vw, 20px);
  letter-spacing: 0.08em;
  opacity: 0.9;
}
#time.warn { color: var(--coral); }
#banner {
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
  text-align: center;
}
#bannerTitle { font-size: clamp(26px, 5vw, 48px); font-weight: 600; letter-spacing: 0.18em; padding-left: 0.18em; }
#bannerSub { font-size: clamp(13px, 2vw, 18px); opacity: 0.8; }
#bannerSub:empty { display: none; }
#bannerHint { font-size: clamp(13px, 2vw, 18px); letter-spacing: 0.1em; margin-top: 6px; }
#debugGame { left: 20px; bottom: 12px; font-size: 12px; opacity: 0.55; }

/* 개발용 상태 줄 */
#status { margin: 0; font-size: 12px; color: var(--ink-dim); }
#status.error { color: #f88; }

/* ---------- 작은 화면 ---------- */
@media (max-width: 600px) {
  #playBtn { margin-right: 14px; --w: 230px; }
  #howtoBtn { margin-left: 14px; }
  /* How to Play: 가로 흐름 대신 위에서 아래로 이어지는 흐름 */
  .flowline { display: none; }
  .nodes { grid-template-columns: 1fr; gap: 22px; }
  .node { display: grid; grid-template-columns: 60px 1fr; grid-template-rows: auto auto; column-gap: 16px; row-gap: 2px; align-items: center; text-align: left; padding: 0 8px; position: relative; }
  .node .bubble { width: 60px; height: 60px; grid-row: 1 / span 2; }
  .node b { margin: 0; align-self: end; padding-left: 0; }
  .node .desc { align-self: start; }
  .node:not(:last-child)::after { content: ""; position: absolute; left: 38px; top: 64px; height: 24px; border-left: 1px dashed color-mix(in srgb, var(--accent) 60%, transparent); }
}
@media (prefers-reduced-motion: reduce) {
  .screen, #stage, .pulse, .wob, .tail, .logo, .bubble { animation: none; }
  .fishbtn svg { transition: none; }
}