/* =========================================================
   날씨·시간대별 배경 (weather-scene.js가 생성하는 .sky-scene)
   레이어 순서: 사진 → 빛/별 → 구름 → 가독성용 어둡게 → 빗줄기
========================================================= */

/* 기존 화면의 파란 계열 색. 날씨 장면에 맞춰 weather-scene.js가 같은 투명도로 색조만 바꿉니다. */
:root {
  --sky-tone-1: rgba(42, 130, 184, 0.26);
  --sky-tone-2: rgba(39, 123, 177, 0.28);
  --sky-tone-3: rgba(76, 118, 149, 0.62);
  --sky-tone-4: rgba(105, 153, 189, 0.28);
  --sky-tone-5: rgba(114, 157, 190, 0.25);
  --sky-tone-6: rgba(145, 184, 212, 0.3);
  --sky-tone-7: #6bb0df;
  --sky-tone-8: #33415a;
  --sky-tone-9: #263238;
  --sky-tone-10: #87aeca;
  --sky-tone-11: #4c8fc4;
  --sky-tone-12: #2479b4;
  --sky-tone-13: #78b9dc;
  --sky-tone-14: rgba(18, 70, 115, 0.18);
  --sky-tone-15: rgba(80, 163, 212, 0.58);
  --sky-tone-16: rgba(32, 122, 184, 0.36);
  --sky-tone-17: rgba(35, 118, 188, 0.55);
  --sky-tone-18: rgba(18, 64, 105, 0.18);
  --sky-tone-19: #4d8fe0;
  --sky-tone-20: rgba(7, 75, 128, 0.08);
  --sky-tone-21: #4b8fc4;
  --sky-tone-22: #68a9da;
  --sky-tone-23: rgba(22, 116, 181, 0.34);
  --sky-tone-24: rgba(0, 45, 85, 0.35);
  --sky-tone-25: rgb(50, 107, 157);
  --sky-tone-26: rgba(21, 73, 116, 0.94);
  --sky-tone-27: rgba(8, 42, 72, 0.24);
  --sky-tone-28: rgba(9, 57, 91, 0.3);
  --sky-tone-29: rgba(20, 78, 118, 0.9);
  --sky-tone-30: rgba(7, 44, 70, 0.25);
  --sky-tone-31: #5d9dcc;
  --sky-tone-32: rgba(20, 70, 105, 0.24);
  --sky-tone-33: #245b80;
  --sky-tone-34: rgba(93, 136, 166, 0.28);
  --sky-tone-35: rgba(37, 77, 103, 0.3);
  --sky-tone-36: rgba(37, 77, 103, 0.38);
  --sky-tone-37: rgba(20, 80, 120, 0.12);
  --sky-tone-38: rgba(67, 143, 194, 0.3);
  /* 오른쪽 "전국 주요 날씨" 패널: 장면 색에 회색을 섞어 채도를 낮추고 덜 투명하게 */
  --sky-panel: color-mix(in srgb, var(--sky-tone-3) 50%, rgba(98, 104, 112, 0.95));
}

/* 배경 장면이 기존 페이지 그라디언트 배경을 대신합니다. */
html.has-sky-scene body.index-body,
html.has-sky-scene body.weather-body,
html.has-sky-scene body.history-body {
  background: transparent !important;
}

html.has-sky-scene body.weather-body::before {
  content: none !important;
}

/* 장면별 사진과 가독성용 어둡게 처리.
   html 배경에도 깔아두어 스크립트 실행 전 첫 화면부터 같은 배경이 보이게 합니다.
   --sky-base는 사진의 평균 색으로, 사진이 그려지기 전 순간에 보이는 바탕색입니다. */
html[data-sky="sunny"] {
  --sky-photo: url("../images/sunny.jpg");
  --sky-base: #5984bb;
  --sky-scrim: linear-gradient(rgba(8, 42, 82, 0.12), rgba(8, 42, 82, 0.26));
  --sky-photo-position: center top;
}

html[data-sky="sunset"] {
  --sky-photo: url("../images/sunset.jpg");
  --sky-base: #7f7c91;
  --sky-scrim: linear-gradient(rgba(36, 28, 60, 0.12), rgba(36, 28, 60, 0.3));
  --sky-photo-position: center top;
}

html[data-sky="night"] {
  --sky-photo: url("../images/night.jpg");
  --sky-base: #242843;
  --sky-scrim: linear-gradient(rgba(6, 10, 30, 0.08), rgba(6, 10, 30, 0.25));
  --sky-photo-position: center top;
}

html[data-sky="cloudy"] {
  --sky-photo: url("../images/cloudy.jpg");
  --sky-base: #727272;
  --sky-scrim: linear-gradient(rgba(22, 32, 48, 0.28), rgba(22, 32, 48, 0.38));
}

html[data-sky="rain"] {
  --sky-photo: url("../images/rain.jpg");
  --sky-base: #949395;
  --sky-scrim: linear-gradient(rgba(14, 22, 34, 0.36), rgba(14, 22, 34, 0.48));
}

html.has-sky-scene[data-sky] {
  background:
    var(--sky-scrim),
    var(--sky-photo) var(--sky-photo-position, center) / cover no-repeat,
    var(--sky-base) !important;
}

/* 구장 선택 화면의 지도 실루엣이 배경 사진에 묻히지 않도록 밝고 선명하게 */
html.has-sky-scene[data-sky] body.index-body .korea-svg-img,
html.has-sky-scene[data-sky] body.weather-body .weather-map-silhouette {
  opacity: 1 !important;
  filter: grayscale(1) brightness(2) contrast(0.95)
    drop-shadow(0 6px 18px rgba(0, 0, 0, 0.25)) !important;
}

.sky-scene {
  position: fixed;
  inset: 0;
  z-index: -1;
  overflow: hidden;
  pointer-events: none;
}

.sky-scene > * {
  position: absolute;
  inset: 0;
}

.sky-photo {
  background-position: center;
  background-repeat: no-repeat;
  background-size: cover;
  opacity: 0;
  transition: opacity 1.2s ease;
}

/* 해·노을·별이 있는 사진은 하늘 윗부분이 보이도록 위쪽 기준으로 자릅니다. */
.sky-photo[data-scene="sunny"],
.sky-photo[data-scene="sunset"],
.sky-photo[data-scene="night"] {
  background-position: center top;
}

.sky-photo.is-visible {
  opacity: 1;
}

.sky-glow,
.sky-stars,
.sky-rain {
  opacity: 0;
  transition: opacity 1.5s ease;
}

.sky-scene[data-scene="sunny"] .sky-glow {
  background: radial-gradient(
    circle at 30% 8%,
    rgba(255, 248, 225, 0.55) 0,
    rgba(255, 240, 200, 0.18) 18%,
    transparent 45%
  );
  opacity: 1;
  /* 느린 효과는 초당 10번만 갱신해 뒤를 흐리게 하는 박스들의 재계산을 줄입니다. */
  animation: sky-glow-pulse 9s steps(90) infinite alternate;
}

.sky-scene[data-scene="sunset"] .sky-glow {
  background: linear-gradient(
    to top,
    rgba(255, 176, 128, 0.28) 0,
    rgba(240, 150, 140, 0.12) 35%,
    transparent 65%
  );
  opacity: 1;
}

.sky-stars {
  inset: 0 auto auto 0;
  width: 2px;
  height: 2px;
  border-radius: 50%;
}

.sky-scene[data-scene="night"] .sky-stars {
  opacity: 1;
  animation: sky-twinkle 5s steps(50) infinite alternate;
}

.sky-scene[data-scene="night"] .sky-stars + .sky-stars {
  animation-duration: 7s;
  animation-timing-function: steps(70);
  animation-delay: -3s;
}

.sky-clouds {
  inset: -4% auto auto 0;
  width: calc(100% + var(--tile));
  height: 62%;
  background: url("../images/clouds.svg") repeat-x 0 0 / var(--tile) 100%;
  opacity: var(--opacity, 0);
  filter: brightness(var(--brightness, 1));
  /* 구름은 아주 느리게 움직이므로 초당 10번(--steps)만 위치를 갱신합니다. */
  animation: sky-drift var(--speed, 240s) steps(var(--steps, 2400)) infinite;
  transition: opacity 1.5s ease;
  will-change: transform;
}

.sky-clouds-far {
  --tile: 1200px;
}

.sky-clouds-near {
  --tile: 1700px;
  top: 6%;
  height: 70%;
}

.sky-scrim {
  background: var(--sky-scrim, transparent);
}

/* 저장된 장면으로 시작할 때는 페이드 없이 바로 표시 */
.sky-scene.is-instant > * {
  transition: none !important;
}

.sky-rain.is-active {
  opacity: 1;
}

@keyframes sky-drift {
  to {
    transform: translate3d(calc(-1 * var(--tile)), 0, 0);
  }
}

@keyframes sky-glow-pulse {
  from {
    opacity: 0.65;
  }
  to {
    opacity: 1;
  }
}

@keyframes sky-twinkle {
  from {
    opacity: 0.35;
  }
  to {
    opacity: 1;
  }
}

@media (prefers-reduced-motion: reduce) {
  .sky-clouds,
  .sky-glow,
  .sky-stars {
    animation: none !important;
  }
}