/* ===== Base ===== */
*,
*::before,
*::after {
  box-sizing: border-box;
}

:root {
  --bgm-right-space: 10px;
  --bgm-inner-gap: 6px;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Yu Gothic", sans-serif;
  background: radial-gradient(circle at top, #0f172a 0, #020617 52%, #000 100%);
  color: #e5e7eb;
}

/* ===== Header / Nav ===== */
.nav {
  position: sticky;
  top: 0;
  z-index: 30;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 8px 16px;
  background: rgba(15, 23, 42, 0.96);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid rgba(148, 163, 184, 0.35);
}

.nav .brand {
  font-weight: 600;
  color: #e5e7eb;
  text-decoration: none;
  white-space: nowrap;
}

.nav .go-up {
  margin-left: 4px;
  margin-right: auto;
  font-size: 14px;
  text-decoration: none;
  color: #9ca3af;
}

.nav nav {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.nav nav a {
  font-size: 13px;
  color: #9ca3af;
  text-decoration: none;
  padding: 3px 6px;
  border-radius: 999px;
  border: 1px solid transparent;
  transition: background 0.15s ease, color 0.15s ease, border-color 0.15s ease;
}

.nav nav a:hover {
  color: #e5e7eb;
  border-color: rgba(148, 163, 184, 0.6);
  background: rgba(15, 23, 42, 0.9);
}

/* ===== Main ===== */
.room-main {
  padding: 16px 16px 32px;
  max-width: 1200px;
  margin: 0 auto;
}

/* ===== Suzuko Intro ===== */
.suzuko-room {
  max-width: 1100px;
  margin: 0 auto;
}

.suzuko-intro {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 20px;
}

.suzuko-intro-main {
  
  flex: 0 0 260px;
  margin: 0;
  background-color: rgba(0, 0, 0, 0); /* 完全透明 */
}

.suzuko-intro-main img {
  display: block;
  width: 100%;
  height: auto;
}

.suzuko-intro-text {
  flex: 1;
}

.suzuko-intro-lead {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
}

/* ===== Suzuko Scene List ===== */
.suzuko-scene-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.suzuko-scene {
  display: flex;
  gap: 16px;
  padding: 10px 12px;
  border-radius: 12px;
  background: rgba(15, 23, 42, 0.7);
  box-shadow: 0 0 14px rgba(0, 0, 0, 0.5);
}

.suzuko-scene-image {
  flex: 0 0 200px;
  margin: 0;
  border-radius: 10px;
  overflow: hidden;
  background: #020617;
}

.suzuko-scene-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  cursor: pointer;
  transition: transform 0.25s ease, opacity 0.25s ease;
}

.suzuko-scene-image img:hover {
  transform: scale(1.03);
  opacity: 0.95;
}

.suzuko-scene-text {
  flex: 1;
  font-size: 14px;
  line-height: 1.7;
}

.suzuko-scene-title {
  margin: 0 0 4px;
  font-weight: 600;
  color: #facc15;
}

/* SP レイアウト調整 */
@media (max-width: 720px) {
  .room-main {
    padding-inline: 10px;
  }

  .suzuko-intro {
    flex-direction: column;
    align-items: stretch;
  }

  .suzuko-intro-main {
    flex: none;
  }

  .suzuko-scene {
    flex-direction: column;
  }

  .suzuko-scene-image {
    flex: none;
  }
}

/* ===== Lightbox ===== */
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 40;
}

.lightbox.hidden {
  display: none;
}

.lightbox-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(15, 23, 42, 0.7);
  backdrop-filter: blur(3px);
}

.lightbox-inner {
  position: absolute;
  inset: 0;
  margin: auto;
  max-width: min(1200px, 98vw);
  max-height: min(90vh, 900px);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  padding: 16px;
  border-radius: 16px;
  background: radial-gradient(circle at top, #020617 0, #020617 35%, #000 100%);
  box-shadow: 0 25px 80px rgba(0, 0, 0, 0.95);
}

.lightbox-inner img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
  border-radius: 12px;
}

.lightbox-caption {
  margin: 0;
  font-size: 13px;
  line-height: 1.8;
  text-align: center;
  white-space: pre-line;
}

.lightbox-close {
  position: absolute;
  top: 10px;
  right: 14px;
  border: none;
  background: transparent;
  color: #9ca3af;
  font-size: 24px;
  cursor: pointer;
}

/* ===== BGM ボタン一式 ===== */
.bgm-wrap {
  position: fixed;
  right: var(--bgm-right-space);
  bottom: 12px;
  z-index: 50;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: var(--bgm-inner-gap);
}

.bgm-toggle {
  border: none;
  border-radius: 999px;
  padding: 5px 10px;
  font-size: 12px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(15, 118, 110, 0.95);
  color: #e0f2f1;
  cursor: pointer;
  box-shadow: 0 10px 30px rgba(15, 23, 42, 0.7);
  transition: box-shadow 0.2s ease, transform 0.2s ease, color 0.2s ease, background 0.2s ease;
}

.bgm-toggle:hover {
  transform: translateY(-1px);
}

.bgm-toggle.is-playing {
  background: #22c55e;
  color: #022c22;
}

.bgm-file-label {
  padding: 2px 8px;
  border-radius: 999px;
  background: rgba(15, 23, 42, 0.9);
  border: 1px solid rgba(148, 163, 184, 0.7);
  font-size: 12px;
  color: #fde68a;
  opacity: 0.7;
  max-width: 180px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.bgm-toggle.is-playing + .bgm-file-label {
  opacity: 1;
  color: #fbbf24;
}

/* ===== Footer ===== */
footer {
  padding: 16px;
  text-align: center;
  font-size: 12px;
  color: #9ca3af;
}
/* ===== Lightbox slider nav ===== */
.lightbox-inner {
  /* もともと absolute 指定などがあるので、それはそのまま活かす */
  position: absolute;
}

.lightbox-nav {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  border: none;
  background: rgba(15, 23, 42, 0.8);
  color: #e5e7eb;
  width: 36px;
  height: 36px;
  border-radius: 999px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.7);
  transition: background 0.15s ease, transform 0.15s ease, opacity 0.15s ease;
}

.lightbox-prev {
  left: 8px;
}

.lightbox-next {
  right: 8px;
}

.lightbox-nav:hover {
  transform: translateY(-50%) scale(1.05);
}

.lightbox-nav.is-disabled,
.lightbox-nav:disabled {
  opacity: 0.35;
  cursor: default;
  box-shadow: none;
}

/* スマホでのナビ位置微調整 */
@media (max-width: 720px) {
  .lightbox-prev {
    left: 4px;
  }
  .lightbox-next {
    right: 4px;
  }
}