@import url('https://fonts.googleapis.com/css2?family=Cormorant+Garamond:ital,wght@0,400;0,600;0,700;1,400&family=Noto+Serif+JP:wght@300;400;600&family=Noto+Sans+JP:wght@300;400;500&family=JetBrains+Mono:wght@400;500&display=swap');

/* ─── カスタムプロパティ ─── */
:root {
  --c-text:       #2a2a2a;
  --c-heading:    #1a1a1a;
  --c-sub:        #6a6a6a;
  --c-border:     #d0d0d0;
  --c-accent:     #4a4a4a;
  --c-card-bg:    rgba(255,255,255,0.88);
  --c-badge-on:   #2a2a2a;
  --c-badge-off:  #c0c0c0;

  --f-serif-en:   'Cormorant Garamond', 'Times New Roman', serif;
  --f-serif-jp:   'Noto Serif JP', 'Georgia', serif;
  --f-sans:       'Noto Sans JP', sans-serif;
  --f-mono:       'JetBrains Mono', 'Courier New', monospace;

  --header-h:     60px;
  --card-gap:     24px;
  --max-w:        1200px;
  --content-w:    720px;
}

/* ─── リセット ─── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; }
img, video { display: block; max-width: 100%; }
a { color: inherit; }

/* ─── ボディ・背景 ─── */
body {
  font-family: var(--f-sans);
  color: var(--c-text);
  background-color: #f5f3f0;
  background-image: url('../assets/bg/white-empty-room4.jpg');
  background-size: cover;
  background-attachment: fixed;
  background-position: center top;
  background-repeat: no-repeat;
  min-height: 100vh;
}
/* モバイルでは fixed が重いので scroll に切り替え */
@media (max-width: 767px) {
  body { background-attachment: scroll; }
}

/* ─── ヘッダー ─── */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-h);
  background: rgba(255,255,255,0.88);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  box-shadow: 0 1px 12px rgba(0,0,0,0.07);
}
.site-header__inner {
  width: 100%;
  max-width: var(--max-w);
  margin: 0 auto;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
}
.site-header__logo {
  font-family: var(--f-mono);
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--c-heading);
  text-decoration: none;
  letter-spacing: 0.08em;
}
.site-header__logo img {
  height: 28px;
  width: auto;
}
.site-header__nav a {
  font-family: var(--f-sans);
  font-size: 0.8125rem;
  color: var(--c-sub);
  text-decoration: none;
  letter-spacing: 0.08em;
  transition: color 0.2s;
}
.site-header__nav a:hover { color: var(--c-heading); }

/* ─── ヒーロー ─── */
.hero {
  text-align: center;
  padding: 80px 24px 60px;
}
.hero__label {
  font-family: var(--f-mono);
  font-size: 0.6875rem;
  color: var(--c-sub);
  letter-spacing: 0.25em;
  text-transform: uppercase;
  margin-bottom: 16px;
}
.hero__title {
  font-family: var(--f-serif-en);
  font-size: clamp(1.75rem, 4.5vw, 3rem);
  font-weight: 600;
  color: var(--c-heading);
  letter-spacing: 0.15em;
  margin-bottom: 20px;
  line-height: 1.15;
}
.hero__lead {
  font-family: var(--f-serif-jp);
  font-size: 0.9375rem;
  line-height: 2.2;
  color: var(--c-text);
  max-width: 440px;
  margin: 0 auto;
}

/* ─── ギャラリー ─── */
.gallery { padding: 0 24px 80px; }
.gallery__inner {
  max-width: var(--max-w);
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--card-gap);
}
@media (max-width: 1023px) {
  .gallery__inner { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 767px) {
  .gallery__inner { grid-template-columns: 1fr; }
  .gallery { padding: 0 16px 60px; }
}

/* ─── カード ─── */
.card {
  background: var(--c-card-bg);
  border: 1px solid var(--c-border);
  box-shadow: 0 4px 20px rgba(0,0,0,0.07);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  opacity: 0;
  transform: translateY(20px);
}
.card.is-visible {
  animation: cardIn 0.5s ease forwards;
}
@keyframes cardIn {
  to { opacity: 1; transform: translateY(0); }
}
.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 32px rgba(0,0,0,0.13);
}

/* カードメディア（動画/画像エリア） */
.card__media {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: linear-gradient(135deg, #2a2a2a 0%, #4a4a4a 100%);
}
.card__video,
.card__image {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: brightness(0.85) contrast(1.05);
  transition: filter 0.3s ease;
}
.card:hover .card__video,
.card:hover .card__image {
  filter: brightness(1) contrast(1);
}
/* 上下グラデーションオーバーレイ */
.card__media::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(
    to bottom,
    rgba(0,0,0,0.12) 0%,
    transparent 35%,
    transparent 55%,
    rgba(0,0,0,0.32) 100%
  );
  z-index: 1;
  pointer-events: none;
}
/* ゲームごとのプレースホルダー背景色 */
.card__media--uragiri   { background: linear-gradient(135deg, #2d1a10 0%, #5a3020 100%); }
.card__media--isekai    { background: linear-gradient(135deg, #0a1a30 0%, #1a3560 100%); }
.card__media--shoujo    { background: linear-gradient(135deg, #1a0a2d 0%, #3d1560 100%); }
.card__media--suspect   { background: linear-gradient(135deg, #0d1a22 0%, #1a3040 100%); }
.card__media--aonami    { background: linear-gradient(135deg, #082020 0%, #0f3545 100%); }

/* バッジ */
.card__badge {
  position: absolute;
  top: 12px;
  left: 12px;
  z-index: 2;
  padding: 3px 9px;
  font-family: var(--f-mono);
  font-size: 0.5625rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}
.card__badge--on  { background: var(--c-badge-on);  color: #fff; }
.card__badge--off { background: var(--c-badge-off); color: #888; }

/* カードボディ */
.card__body  { padding: 20px; }
.card__title {
  font-family: var(--f-serif-jp);
  font-size: 1.0625rem;
  font-weight: 600;
  color: var(--c-heading);
  margin-bottom: 4px;
}
.card__subtitle {
  font-size: 0.6875rem;
  color: var(--c-sub);
  letter-spacing: 0.05em;
  margin-bottom: 10px;
}
.card__tagline {
  font-size: 0.8125rem;
  line-height: 1.9;
  color: var(--c-text);
  margin-bottom: 14px;
}
.card__divider {
  border: none;
  border-top: 1px solid var(--c-border);
  margin-bottom: 12px;
}
.card__meta {
  display: flex;
  gap: 16px;
  font-size: 0.6875rem;
  color: var(--c-sub);
  margin-bottom: 14px;
  font-family: var(--f-mono);
  letter-spacing: 0.03em;
}
.card__actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

/* ─── ボタン ─── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 7px 14px;
  font-size: 0.6875rem;
  font-family: var(--f-mono);
  letter-spacing: 0.06em;
  text-decoration: none;
  border: 1px solid currentColor;
  cursor: pointer;
  transition: background 0.2s, color 0.2s, border-color 0.2s;
  white-space: nowrap;
}
.btn--outline {
  color: var(--c-accent);
  background: transparent;
}
.btn--outline:hover {
  background: var(--c-accent);
  color: #fff;
}
.btn--primary {
  background: var(--c-heading);
  color: #fff;
  border-color: var(--c-heading);
}
.btn--primary:hover {
  background: var(--c-accent);
  border-color: var(--c-accent);
}
.btn--disabled {
  color: var(--c-badge-off);
  border-color: var(--c-badge-off);
  background: transparent;
  cursor: not-allowed;
  pointer-events: none;
}
/* ゲームページのCTAボタン（大） */
.btn--cta {
  padding: 16px 48px;
  font-size: 0.875rem;
  letter-spacing: 0.12em;
}

/* ─── フッター ─── */
.site-footer {
  text-align: center;
  padding: 32px 24px;
  color: var(--c-sub);
  font-size: 0.6875rem;
  font-family: var(--f-sans);
  border-top: 1px solid var(--c-border);
  background: rgba(255,255,255,0.65);
  line-height: 1.8;
}

/* ═══════════════════════════════════
   ゲーム説明ページ専用スタイル
   ═══════════════════════════════════ */

.game-page { min-height: calc(100vh - var(--header-h)); }

/* パンくず */
.breadcrumb {
  max-width: var(--content-w);
  margin: 28px auto 0;
  padding: 0 24px;
}
.breadcrumb a {
  font-family: var(--f-mono);
  font-size: 0.75rem;
  color: var(--c-sub);
  text-decoration: none;
  letter-spacing: 0.06em;
  transition: color 0.2s;
}
.breadcrumb a:hover { color: var(--c-heading); }

/* 観測ヘッダー */
.observation-header {
  max-width: var(--content-w);
  margin: 32px auto;
  padding: 0 24px;
  text-align: center;
}
.observation-number {
  font-family: var(--f-mono);
  font-size: 0.625rem;
  color: var(--c-sub);
  letter-spacing: 0.3em;
  text-transform: uppercase;
  margin-bottom: 12px;
}
.observation-title {
  font-family: var(--f-serif-jp);
  font-size: clamp(1.75rem, 4vw, 2.75rem);
  font-weight: 600;
  color: var(--c-heading);
  margin-bottom: 8px;
  line-height: 1.3;
}
.observation-subtitle {
  font-family: var(--f-sans);
  font-size: 0.8125rem;
  color: var(--c-sub);
  letter-spacing: 0.08em;
}
/* 装飾罫線 */
.rule-line {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 20px 0;
  color: var(--c-border);
}
.rule-line::before,
.rule-line::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--c-border);
}

/* キービジュアル */
.key-visual {
  max-width: var(--content-w);
  margin: 0 auto 40px;
  padding: 0 24px;
}
.key-visual__media {
  width: 100%;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: linear-gradient(135deg, #2a2a2a 0%, #4a4a4a 100%);
}
.key-visual__video,
.key-visual__image {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ゲームコンテンツ（カード） */
.game-content {
  max-width: var(--content-w);
  margin: 0 auto 80px;
  padding: 0 24px;
  display: flex;
  flex-direction: column;
  gap: 0;
}

/* セクション */
.game-section {
  background: var(--c-card-bg);
  border: 1px solid var(--c-border);
  padding: 32px 36px;
  margin-bottom: -1px;
}
@media (max-width: 480px) {
  .game-section { padding: 24px 20px; }
}

.game-section__heading {
  font-family: var(--f-serif-en);
  font-size: 0.625rem;
  color: var(--c-sub);
  letter-spacing: 0.3em;
  text-transform: uppercase;
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 20px;
}
.game-section__heading::before,
.game-section__heading::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--c-border);
}

/* 観測データ */
.obs-data {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 16px 24px;
}
.obs-data__item {}
.obs-data__label {
  font-family: var(--f-mono);
  font-size: 0.5625rem;
  color: var(--c-sub);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  margin-bottom: 4px;
}
.obs-data__value {
  font-family: var(--f-sans);
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--c-heading);
}
.tags { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 4px; }
.tag {
  font-family: var(--f-mono);
  font-size: 0.5625rem;
  color: var(--c-sub);
  border: 1px solid var(--c-border);
  padding: 2px 8px;
  letter-spacing: 0.06em;
}

/* 空間の概要 */
.game-overview p {
  font-family: var(--f-serif-jp);
  font-size: 0.9375rem;
  line-height: 2.1;
  color: var(--c-text);
}
.game-overview p + p { margin-top: 1.4em; }

/* 役割の片鱗 */
.role-list { display: flex; flex-direction: column; gap: 12px; }
.role-item {}
.role-item__name {
  font-family: var(--f-serif-jp);
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--c-heading);
  margin-bottom: 4px;
}
.role-item__desc {
  font-family: var(--f-sans);
  font-size: 0.8125rem;
  line-height: 1.7;
  color: var(--c-sub);
}

/* シンクロ手順 */
.sync-steps { counter-reset: step; }
.sync-step {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  padding: 10px 0;
  border-bottom: 1px solid var(--c-border);
}
.sync-step:last-child { border-bottom: none; }
.sync-step__num {
  font-family: var(--f-mono);
  font-size: 0.6875rem;
  color: var(--c-sub);
  min-width: 24px;
  padding-top: 1px;
}
.sync-step__text {
  font-family: var(--f-sans);
  font-size: 0.875rem;
  line-height: 1.7;
  color: var(--c-text);
}

/* シンクロCTA */
.sync-cta {
  background: var(--c-card-bg);
  border: 1px solid var(--c-border);
  padding: 48px 36px;
  text-align: center;
  margin-bottom: -1px;
}
.sync-cta__note {
  font-family: var(--f-mono);
  font-size: 0.5625rem;
  color: var(--c-sub);
  letter-spacing: 0.15em;
  margin-top: 16px;
}

/* ═══════════════════════════════════
   about.html 専用スタイル
   ═══════════════════════════════════ */

.about-page {
  max-width: var(--content-w);
  margin: 0 auto;
  padding: 48px 24px 80px;
}
.about-header {
  text-align: center;
  margin-bottom: 60px;
}
.about-header__label {
  font-family: var(--f-mono);
  font-size: 0.625rem;
  letter-spacing: 0.3em;
  color: var(--c-sub);
  text-transform: uppercase;
  margin-bottom: 16px;
}
.about-header__title {
  font-family: var(--f-serif-en);
  font-size: clamp(1.75rem, 5vw, 3rem);
  font-weight: 600;
  color: var(--c-heading);
  letter-spacing: 0.15em;
}

/* スクロールリビール */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.reveal.is-revealed {
  opacity: 1;
  transform: translateY(0);
}

/* about セクション */
.about-section {
  background: var(--c-card-bg);
  border: 1px solid var(--c-border);
  padding: 40px 44px;
  margin-bottom: -1px;
}
@media (max-width: 480px) {
  .about-section { padding: 28px 20px; }
}
.about-section__heading {
  font-family: var(--f-serif-en);
  font-size: 0.5625rem;
  color: var(--c-sub);
  letter-spacing: 0.3em;
  text-transform: uppercase;
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 20px;
}
.about-section__heading::before,
.about-section__heading::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--c-border);
}
.about-section__title {
  font-family: var(--f-serif-jp);
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--c-heading);
  margin-bottom: 16px;
}
.about-section p {
  font-family: var(--f-serif-jp);
  font-size: 0.9375rem;
  line-height: 2.1;
  color: var(--c-text);
}
.about-section p + p { margin-top: 1.2em; }
.about-section__note {
  font-family: var(--f-mono);
  font-size: 0.6875rem;
  color: var(--c-sub);
  border-left: 2px solid var(--c-border);
  padding-left: 12px;
  margin-top: 16px;
  line-height: 1.8;
}

/* about CTA */
.about-cta {
  background: var(--c-card-bg);
  border: 1px solid var(--c-border);
  padding: 48px 44px;
  text-align: center;
}

/* about ページ - ヒーロー動画 */
.about-video {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: #0a0a0a;
  margin-bottom: -1px;
}
.about-video video {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.65;
}
.about-video__overlay {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(
    to bottom,
    rgba(0,0,0,0.18) 0%,
    rgba(0,0,0,0.52) 100%
  );
  padding: 24px;
}
.about-video__tagline {
  font-family: var(--f-serif-jp);
  font-size: clamp(0.875rem, 2.5vw, 1.25rem);
  color: rgba(255,255,255,0.93);
  text-align: center;
  line-height: 2.2;
  letter-spacing: 0.12em;
  text-shadow: 0 2px 16px rgba(0,0,0,0.7);
  max-width: 520px;
}