/* ===========================
   間 Gallery — 共通スタイル
   和風ミニマルデザイン
   =========================== */

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

/* ===== CSS変数 ===== */
:root {
  --color-bg:        #f8f6f1;       /* 和紙色 */
  --color-bg-alt:    #f0ede4;       /* 薄茶 */
  --color-surface:   #ffffff;
  --color-ink:       #1a1816;       /* 墨色 */
  --color-ink-muted: #6b6560;       /* 薄墨 */
  --color-ink-faint: #b0aaa3;       /* 霞色 */
  --color-accent:    #c9a882;       /* 薄茶・梅鼠 */
  --color-sakura:    #e8c4c0;       /* 桜色 */
  --color-border:    #e0dbd2;       /* 薄縁 */
  --color-overlay:   rgba(26,24,22,0.65);

  --font-serif-jp:   'Noto Serif JP', 'Yu Mincho', serif;
  --font-sans-jp:    'Noto Sans JP', 'Hiragino Sans', sans-serif;
  --font-latin:      'Cormorant Garamond', Georgia, serif;

  --radius-sm:  4px;
  --radius-md:  8px;
  --radius-lg:  16px;

  --shadow-sm:  0 1px 4px rgba(26,24,22,0.06);
  --shadow-md:  0 4px 20px rgba(26,24,22,0.10);
  --shadow-lg:  0 12px 48px rgba(26,24,22,0.14);

  --transition: 0.3s ease;

  --max-w: 1280px;
  --side-pad: clamp(1.5rem, 5vw, 4rem);
}

/* ===== リセット & ベース ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-sans-jp);
  background: var(--color-bg);
  color: var(--color-ink);
  line-height: 1.7;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
  text-decoration: none;
}

img {
  display: block;
  max-width: 100%;
  height: auto;
}

ul, ol { list-style: none; }

button, input, select, textarea {
  font-family: inherit;
  font-size: inherit;
}

/* ===== スクロールバー ===== */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--color-bg-alt); }
::-webkit-scrollbar-thumb { background: var(--color-ink-faint); border-radius: 3px; }

/* ===== 選択色 ===== */
::selection {
  background: var(--color-sakura);
  color: var(--color-ink);
}

/* ===== ヘッダー共通 ===== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 1.25rem var(--side-pad);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  background: transparent;
  transition: background var(--transition), backdrop-filter var(--transition), box-shadow var(--transition);
}

.site-header.scrolled {
  background: rgba(248,246,241,0.88);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: 0 1px 0 var(--color-border);
}

.site-logo {
  display: flex;
  flex-direction: column;
  line-height: 1;
  gap: 0.15rem;
}

.site-logo__ja {
  font-family: var(--font-serif-jp);
  font-size: 1.3rem;
  font-weight: 500;
  letter-spacing: 0.25em;
  color: var(--color-ink);
}

.site-logo__en {
  font-family: var(--font-latin);
  font-size: 0.7rem;
  letter-spacing: 0.35em;
  color: var(--color-ink-muted);
  text-transform: uppercase;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.site-nav a {
  font-family: var(--font-sans-jp);
  font-size: 0.8rem;
  font-weight: 400;
  letter-spacing: 0.1em;
  color: var(--color-ink-muted);
  transition: color var(--transition);
  position: relative;
}

.site-nav a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--color-accent);
  transition: width var(--transition);
}

.site-nav a:hover { color: var(--color-ink); }
.site-nav a:hover::after { width: 100%; }

/* ===== フッター ===== */
.site-footer {
  padding: 3rem var(--side-pad);
  border-top: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  color: var(--color-ink-faint);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  font-family: var(--font-latin);
  text-align: center;
}

.site-footer__kamon {
  font-size: 1.5rem;
  opacity: 0.3;
  margin-bottom: 0.25rem;
}

/* ===== ボタン共通 ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.6rem 1.4rem;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  font-size: 0.82rem;
  font-weight: 400;
  letter-spacing: 0.08em;
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
}

.btn--primary {
  background: var(--color-ink);
  color: var(--color-bg);
  border-color: var(--color-ink);
}

.btn--primary:hover {
  background: #3a3630;
  border-color: #3a3630;
}

.btn--secondary {
  background: transparent;
  color: var(--color-ink);
  border-color: var(--color-border);
}

.btn--secondary:hover {
  background: var(--color-bg-alt);
  border-color: var(--color-accent);
}

.btn--danger {
  background: transparent;
  color: #c0392b;
  border-color: #e0b0aa;
}

.btn--danger:hover {
  background: #fdf0ee;
  border-color: #c0392b;
}

.btn--sm {
  padding: 0.4rem 0.9rem;
  font-size: 0.75rem;
}

/* ===== カテゴリーバッジ ===== */
.category-badge {
  display: inline-block;
  padding: 0.2rem 0.65rem;
  border-radius: 2px;
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  font-weight: 400;
  border: 1px solid currentColor;
}

.category-badge--一次作品  { color: #8b6914; background: #fdf5e0; border-color: #d4a843; }
.category-badge--二次作品  { color: #5a3e7a; background: #f5f0fa; border-color: #b89dcc; }
.category-badge--フリー素材 { color: #2a6b45; background: #eef7f2; border-color: #7dbf9c; }
.category-badge--3Dモデル  { color: #1a5a8a; background: #eef5fc; border-color: #7ab3d8; }
.category-badge--課題作    { color: #6a4030; background: #faf0ec; border-color: #c09080; }
.category-badge--問題集    { color: #4a4a6a; background: #f0f0f8; border-color: #a0a0c8; }
.category-badge--アプリ   { color: #1a6a5a; background: #edfaf5; border-color: #6dc8aa; }

/* ===== 原作品バッジ（二次作品サブカテゴリー） ===== */
.source-badge {
  display: inline-flex;
  align-items: center;
  padding: 0.18rem 0.55rem;
  border-radius: 2px;
  font-size: 0.68rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  font-family: var(--font-sans-jp);
  vertical-align: middle;
  line-height: 1.4;
  border: 1px solid currentColor;
  white-space: nowrap;
}

/* 原作品ごとのカラー */
.source-badge--Ado              { color: #1a3a5c; background: #e8f0fa; border-color: #7aaad8; }
.source-badge--エヴァンゲリオン   { color: #3a1a5c; background: #f0e8fa; border-color: #a87ad8; }
.source-badge--ゼルダ            { color: #3a5c1a; background: #eaf5e0; border-color: #8ac870; }
.source-badge--セーラームーン     { color: #5c1a3a; background: #fae8f0; border-color: #d870a8; }
.source-badge--ワンピース         { color: #5c2a0a; background: #faf0e0; border-color: #d8a050; }
.source-badge--その他             { color: #4a4a4a; background: #f2f2f2; border-color: #b0b0b0; }

/* ===== サブフィルターバー（二次作品原作品選択） ===== */
.filter-bar--sub {
  margin-top: 0.5rem;
}

.sub-filter-btn {
  padding: 0.35rem 0.85rem;
  border: 1px solid var(--color-border);
  border-radius: 2px;
  background: transparent;
  font-size: 0.74rem;
  font-family: var(--font-sans-jp);
  letter-spacing: 0.06em;
  cursor: pointer;
  transition: all var(--transition);
  color: var(--color-ink-muted);
}

.sub-filter-btn:hover {
  border-color: #b89dcc;
  color: #5a3e7a;
  background: #faf5ff;
}

.sub-filter-btn.active {
  background: #5a3e7a;
  border-color: #5a3e7a;
  color: #fff;
}

/* Ado アクティブ */
.sub-filter-btn[data-source="Ado"].active         { background: #1a3a5c; border-color: #1a3a5c; }
/* エヴァ アクティブ */
.sub-filter-btn[data-source="エヴァンゲリオン"].active { background: #3a1a5c; border-color: #3a1a5c; }
/* ゼルダ アクティブ */
.sub-filter-btn[data-source="ゼルダ"].active        { background: #3a5c1a; border-color: #3a5c1a; }
/* セーラームーン アクティブ */
.sub-filter-btn[data-source="セーラームーン"].active  { background: #5c1a3a; border-color: #5c1a3a; }
/* ワンピース アクティブ */
.sub-filter-btn[data-source="ワンピース"].active     { background: #5c2a0a; border-color: #5c2a0a; }
/* その他 アクティブ */
.sub-filter-btn[data-source="その他"].active        { background: #4a4a4a; border-color: #4a4a4a; }

/* ===== R18 バッジ（インライン） ===== */
.r18-badge-inline {
  display: inline-flex;
  align-items: center;
  padding: 0.1rem 0.45rem;
  background: #7a0010;
  color: #fff;
  border-radius: 2px;
  font-size: 0.64rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  font-family: var(--font-latin);
  vertical-align: middle;
  line-height: 1.4;
}

/* R18フィルターボタン専用スタイル */
.filter-btn--r18 {
  border-color: #d4a0aa;
  color: #8a1020;
  gap: 0.35rem;
}
.filter-btn--r18:hover {
  border-color: #8a1020;
  color: #6a0018;
  background: #fff5f5;
}
.filter-btn--r18.active {
  background: #7a0010;
  border-color: #7a0010;
  color: #fff;
}
.filter-btn--r18.active .r18-badge-inline {
  background: rgba(255,255,255,0.25);
}

/* 管理画面フォームのR18チェックボックス */
.form-checkbox-group--r18 {
  border-color: #d4a0aa;
  background: #fff8f8;
}
.form-checkbox-group--r18 input[type="checkbox"] {
  accent-color: #7a0010;
}

/* ===== 年齢確認モーダル (Age Gate) ===== */
.age-gate {
  position: fixed;
  inset: 0;
  z-index: 600;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.35s ease;
}

.age-gate.open {
  opacity: 1;
  pointer-events: auto;
}

.age-gate__backdrop {
  position: absolute;
  inset: 0;
  background: rgba(10, 8, 6, 0.92);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.age-gate__box {
  position: relative;
  z-index: 1;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 3rem 2.5rem 2.5rem;
  max-width: 440px;
  width: 100%;
  text-align: center;
  box-shadow: var(--shadow-lg);
  transform: scale(0.95) translateY(16px);
  transition: transform 0.35s ease;
}

.age-gate.open .age-gate__box {
  transform: scale(1) translateY(0);
}

.age-gate__kamon {
  font-size: 1.6rem;
  opacity: 0.15;
  margin-bottom: 1rem;
  display: block;
}

.age-gate__label {
  font-family: var(--font-latin);
  font-size: 0.62rem;
  letter-spacing: 0.4em;
  text-transform: uppercase;
  color: var(--color-ink-faint);
  margin-bottom: 0.75rem;
}

.age-gate__title {
  font-family: var(--font-serif-jp);
  font-size: 1.5rem;
  font-weight: 400;
  letter-spacing: 0.18em;
  color: var(--color-ink);
  margin-bottom: 0;
}

.age-gate__divider {
  width: 28px;
  height: 1px;
  background: var(--color-accent);
  margin: 1.25rem auto;
}

.age-gate__message {
  font-size: 0.88rem;
  line-height: 1.85;
  color: var(--color-ink-muted);
  letter-spacing: 0.04em;
  margin-bottom: 1rem;
}

.age-gate__message strong {
  color: #7a0010;
  font-weight: 500;
}

.age-gate__sub {
  font-size: 0.72rem;
  color: var(--color-ink-faint);
  line-height: 1.8;
  letter-spacing: 0.04em;
  margin-bottom: 2rem;
  padding: 0.75rem 1rem;
  background: var(--color-bg);
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  text-align: left;
}

.age-gate__actions {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.age-gate__btn {
  display: block;
  width: 100%;
  padding: 0.85rem 1.5rem;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  font-family: var(--font-sans-jp);
  font-size: 0.85rem;
  letter-spacing: 0.1em;
  cursor: pointer;
  transition: all var(--transition);
}

.age-gate__btn--yes {
  background: #7a0010;
  color: #fff;
  border-color: #7a0010;
}
.age-gate__btn--yes:hover {
  background: #5a0008;
  border-color: #5a0008;
}

.age-gate__btn--no {
  background: transparent;
  color: var(--color-ink-muted);
  border-color: var(--color-border);
}
.age-gate__btn--no:hover {
  background: var(--color-bg-alt);
  border-color: var(--color-accent);
  color: var(--color-ink);
}

/* ===== R18カード ぼかし処理 ===== */
.gallery-card__img.blurred {
  filter: blur(18px);
  transform: scale(1.08); /* blur の端切れ防止 */
}

.gallery-card__blur-cover {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  background: rgba(26, 24, 22, 0.35);
  pointer-events: none;
  z-index: 1;
}

.gallery-card__blur-icon {
  font-size: 1.8rem;
  line-height: 1;
  filter: drop-shadow(0 2px 4px rgba(0,0,0,0.4));
}

.gallery-card__blur-text {
  font-family: var(--font-sans-jp);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  color: rgba(255,255,255,0.9);
  text-shadow: 0 1px 3px rgba(0,0,0,0.6);
  background: rgba(120, 0, 16, 0.7);
  padding: 0.25rem 0.75rem;
  border-radius: 2px;
}

/* ぼかしカードのホバー時ロックアイコン */
.gallery-card--blurred .gallery-card__overlay {
  background: rgba(120, 0, 16, 0.7);
}

/* ===== R18フィルター中の注意バナー ===== */
.r18-notice-banner {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1.25rem;
  background: #fff5f5;
  border: 1px solid #d4a0aa;
  border-radius: var(--radius-sm);
  margin-bottom: 1.5rem;
  font-size: 0.78rem;
  color: #7a0010;
  letter-spacing: 0.06em;
  font-family: var(--font-sans-jp);
}

.r18-notice-banner__icon {
  font-size: 1rem;
  flex-shrink: 0;
}

/* ===== トースト通知 ===== */
#toast-container {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  z-index: 1000;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.toast {
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius-sm);
  font-size: 0.82rem;
  font-family: var(--font-sans-jp);
  letter-spacing: 0.05em;
  box-shadow: var(--shadow-md);
  animation: toastIn 0.3s ease forwards;
  max-width: 320px;
}

.toast--success { background: var(--color-ink); color: var(--color-bg); }
.toast--error   { background: #c0392b; color: #fff; }

@keyframes toastIn {
  from { opacity: 0; transform: translateY(10px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ===== スケルトンローダー ===== */
.skeleton {
  background: linear-gradient(90deg, var(--color-bg-alt) 25%, var(--color-border) 50%, var(--color-bg-alt) 75%);
  background-size: 200% 100%;
  animation: skeletonShimmer 1.4s infinite;
  border-radius: var(--radius-sm);
}

@keyframes skeletonShimmer {
  0%   { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* ===== ユーティリティ ===== */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
}

.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--side-pad);
}

/* ===== アニメーション ===== */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ===== レスポンシブ ===== */
@media (max-width: 768px) {
  :root { --side-pad: 1.25rem; }

  .site-nav { gap: 1.2rem; }
  .site-nav a { font-size: 0.75rem; }
}

@media (max-width: 480px) {
  .site-header { padding: 1rem var(--side-pad); }
  .site-logo__ja { font-size: 1.1rem; }
}