/* ============================================================
   design tokens — 国語辞典世界観
   古紙色ベース / 墨テキスト / 朱アクセント / 瑠璃サブ / 金装飾
   ============================================================ */
:root {
  --bg:           #f2ead0;
  --bg-alt:       #ede0be;
  --bg-card:      #faf5e4;
  --paper-shadow: #c8b88a;
  --ink:          #1a1209;
  --ink-mid:      #3d2b0e;
  --ink-light:    #7a6040;
  --vermilion:    #c0392b;
  --vermilion-dk: #962d22;
  --lapis:        #1a4a7a;
  --lapis-lt:     #2a5f99;
  --gold:         #9a7a32;
  --gold-lt:      #c4a240;
  --rule-line:    rgba(154, 122, 50, 0.30);
  --serif:        'Noto Serif JP', 'Yu Mincho', '游明朝', serif;
  --sans:         'Noto Sans JP', sans-serif;
  --radius-sm:    4px;
  --radius-md:    8px;
  --transition:   0.22s ease;
}

/* ── Reset / Base ────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

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

body {
  font-family: var(--serif);
  background-color: var(--bg);
  color: var(--ink);
  min-height: 100svh;
  display: flex;
  flex-direction: column;
  /* 罫線テクスチャ */
  background-image:
    repeating-linear-gradient(
      to bottom,
      transparent 0,
      transparent calc(2rem - 1px),
      var(--rule-line) calc(2rem - 1px),
      var(--rule-line) 2rem
    );
  background-size: 100% 2rem;
}

/* ── Header ─────────────────────────────────────────────── */
.site-header {
  background-color: var(--ink);
  border-bottom: 3px solid var(--vermilion);
  padding: clamp(0.75rem, 3vw, 1.25rem) clamp(1rem, 5vw, 2.5rem);
}

.header-inner {
  max-width: 780px;
  margin: 0 auto;
}

.header-subtitle {
  font-family: var(--sans);
  font-size: clamp(0.625rem, 2vw, 0.75rem);
  color: var(--gold-lt);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  margin-bottom: 0.2rem;
}

.header-title {
  font-family: var(--serif);
  font-size: clamp(1.25rem, 5vw, 1.875rem);
  font-weight: 700;
  color: var(--bg);
  letter-spacing: 0.1em;
  line-height: 1.2;
}

/* ── Main ────────────────────────────────────────────────── */
.main-container {
  flex: 1;
  max-width: 780px;
  width: 100%;
  margin: 0 auto;
  padding: clamp(1rem, 4vw, 2rem) clamp(1rem, 5vw, 2rem);
}

/* ── Tab Nav ─────────────────────────────────────────────── */
.tab-nav {
  display: flex;
  gap: 0;
  border-bottom: 2px solid var(--gold);
  margin-bottom: clamp(1.25rem, 4vw, 2rem);
}

.tab-btn {
  flex: 1;
  background: var(--bg-alt);
  border: 1px solid var(--paper-shadow);
  border-bottom: none;
  border-radius: var(--radius-sm) var(--radius-sm) 0 0;
  padding: clamp(0.6rem, 2.5vw, 0.9rem) 1rem;
  cursor: pointer;
  font-family: var(--serif);
  color: var(--ink-light);
  transition: background var(--transition), color var(--transition);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.2rem;
  min-height: 44px;
}

.tab-btn:first-child { margin-right: -1px; }

.tab-btn:hover {
  background: var(--bg-card);
  color: var(--ink);
}

.tab-btn.active {
  background: var(--bg-card);
  color: var(--ink);
  border-color: var(--gold);
  border-bottom: 2px solid var(--bg-card);
  position: relative;
  z-index: 1;
}

.tab-game-name {
  font-size: clamp(0.9rem, 3.5vw, 1.1rem);
  font-weight: 700;
  letter-spacing: 0.08em;
}

.tab-rule {
  font-size: clamp(0.625rem, 2vw, 0.75rem);
  letter-spacing: 0.1em;
  color: var(--vermilion);
  font-family: var(--sans);
}

.tab-btn.active .tab-rule { color: var(--vermilion); }

/* ── Panel ───────────────────────────────────────────────── */
.panel { display: none; }
.panel.active { display: block; }

/* ── Filter Section (カタカナーシ) ───────────────────────── */
.filter-section {
  margin-bottom: clamp(1rem, 3vw, 1.5rem);
  background: var(--bg-card);
  border: 1px solid var(--paper-shadow);
  border-left: 3px solid var(--gold);
  border-radius: var(--radius-md);
  padding: clamp(0.75rem, 3vw, 1rem) clamp(0.75rem, 3vw, 1.25rem);
}

.filter-label {
  font-size: clamp(0.7rem, 2.5vw, 0.8rem);
  color: var(--ink-light);
  letter-spacing: 0.15em;
  font-family: var(--sans);
  margin-bottom: 0.6rem;
}

.genre-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.genre-btn {
  font-family: var(--sans);
  font-size: clamp(0.7rem, 2.5vw, 0.8rem);
  padding: 0.3rem 0.7rem;
  border: 1px solid var(--paper-shadow);
  border-radius: 100px;
  background: var(--bg);
  color: var(--ink-mid);
  cursor: pointer;
  transition: background var(--transition), color var(--transition), border-color var(--transition);
  min-height: 44px;
  display: flex;
  align-items: center;
}

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

.genre-btn.selected {
  background: var(--lapis);
  color: #fff;
  border-color: var(--lapis);
}

.genre-btn.all-btn.selected {
  background: var(--gold);
  color: var(--ink);
  border-color: var(--gold);
}

/* ── Card Area ───────────────────────────────────────────── */
.card-area {
  margin-bottom: clamp(1rem, 3vw, 1.5rem);
  perspective: 1000px;
}

.word-card {
  background: var(--bg-card);
  border: 1px solid var(--paper-shadow);
  border-top: 3px solid var(--vermilion);
  border-radius: var(--radius-md);
  padding: clamp(1.5rem, 5vw, 2.5rem) clamp(1rem, 4vw, 2rem);
  min-height: clamp(160px, 30vw, 220px);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  box-shadow:
    3px 3px 0 var(--paper-shadow),
    6px 6px 0 rgba(0,0,0,0.06);
  transition: transform var(--transition), box-shadow var(--transition);
  position: relative;
  /* 辞書の格子罫線 */
  background-image:
    linear-gradient(var(--rule-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--rule-line) 1px, transparent 1px);
  background-size: 2rem 2rem;
  background-color: var(--bg-card);
}

.word-card.eigo {
  border-top-color: var(--lapis);
}

.word-card.pop {
  animation: cardPop 0.25s cubic-bezier(0.34, 1.56, 0.64, 1);
}

@keyframes cardPop {
  0%   { transform: scale(0.95); opacity: 0.6; }
  100% { transform: scale(1);    opacity: 1; }
}

.card-front {
  width: 100%;
}

.card-genre {
  font-family: var(--sans);
  font-size: clamp(0.7rem, 2.5vw, 0.8rem);
  color: var(--vermilion);
  letter-spacing: 0.15em;
  margin-bottom: 0.6rem;
  text-transform: uppercase;
}

.card-word {
  font-size: clamp(1.75rem, 8vw, 3rem);
  font-weight: 700;
  letter-spacing: 0.06em;
  line-height: 1.3;
  color: var(--ink);
}

.eigo-word {
  font-size: clamp(1.5rem, 6vw, 2.5rem);
  font-family: var(--sans);
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--lapis);
}

/* ── NG Area ─────────────────────────────────────────────── */
.ng-area {
  margin-top: clamp(1rem, 3vw, 1.5rem);
  border-top: 1px solid var(--rule-line);
  padding-top: clamp(0.75rem, 2.5vw, 1rem);
  width: 100%;
}

.ng-area.hidden { display: none; }

.ng-label {
  font-family: var(--sans);
  font-size: clamp(0.7rem, 2.5vw, 0.8rem);
  color: var(--ink-light);
  letter-spacing: 0.1em;
  margin-bottom: 0.5rem;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  justify-content: center;
}

.ng-badge {
  display: inline-block;
  background: var(--vermilion);
  color: #fff;
  font-size: 0.65rem;
  font-weight: 700;
  padding: 0.1rem 0.4rem;
  border-radius: 2px;
  letter-spacing: 0.05em;
}

.ng-list {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  justify-content: center;
}

.ng-list li {
  font-family: var(--sans);
  font-size: clamp(0.75rem, 2.5vw, 0.875rem);
  background: rgba(192, 57, 43, 0.08);
  border: 1px solid rgba(192, 57, 43, 0.30);
  color: var(--vermilion-dk);
  padding: 0.2rem 0.65rem;
  border-radius: 100px;
}

/* ── Action Area ─────────────────────────────────────────── */
.action-area {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: clamp(1.25rem, 4vw, 2rem);
}

.draw-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--vermilion);
  color: #fff;
  font-family: var(--serif);
  font-size: clamp(1rem, 3.5vw, 1.125rem);
  font-weight: 700;
  letter-spacing: 0.12em;
  border: none;
  border-radius: var(--radius-sm);
  padding: 0.85rem clamp(1.5rem, 5vw, 2.5rem);
  cursor: pointer;
  min-height: 52px;
  min-width: clamp(180px, 50vw, 240px);
  justify-content: center;
  box-shadow: 0 3px 0 var(--vermilion-dk), 0 4px 12px rgba(192,57,43,0.3);
  transition:
    background var(--transition),
    box-shadow var(--transition),
    transform var(--transition);
}

.draw-btn.eigo {
  background: var(--lapis);
  box-shadow: 0 3px 0 #0f3259, 0 4px 12px rgba(26,74,122,0.3);
}

.draw-btn:hover {
  background: var(--vermilion-dk);
  box-shadow: 0 2px 0 var(--vermilion-dk), 0 2px 8px rgba(192,57,43,0.3);
  transform: translateY(1px);
}

.draw-btn.eigo:hover {
  background: var(--lapis-lt);
  box-shadow: 0 2px 0 #0f3259, 0 2px 8px rgba(26,74,122,0.3);
}

.draw-btn:active {
  transform: translateY(2px);
  box-shadow: none;
}

.draw-btn-icon {
  font-size: 1.2em;
  line-height: 1;
}

.remain-count {
  font-family: var(--sans);
  font-size: clamp(0.7rem, 2.5vw, 0.8rem);
  color: var(--ink-light);
  letter-spacing: 0.08em;
}

.remain-count strong {
  color: var(--gold);
  font-weight: 700;
}

/* ── Rule Box ────────────────────────────────────────────── */
.rule-box {
  background: var(--bg-alt);
  border: 1px solid var(--paper-shadow);
  border-left: 3px solid var(--vermilion);
  border-radius: var(--radius-md);
  padding: clamp(0.75rem, 3vw, 1.25rem) clamp(0.75rem, 3vw, 1.25rem);
}

.rule-box.eigo {
  border-left-color: var(--lapis);
}

.rule-box-title {
  font-size: clamp(0.7rem, 2.5vw, 0.8rem);
  font-family: var(--sans);
  letter-spacing: 0.2em;
  color: var(--ink-light);
  margin-bottom: 0.5rem;
}

.rule-box-body {
  font-size: clamp(0.8rem, 2.8vw, 0.9rem);
  line-height: 1.9;
  color: var(--ink-mid);
}

.rule-box-body strong {
  color: var(--vermilion);
  font-weight: 700;
}

.rule-box.eigo .rule-box-body strong {
  color: var(--lapis);
}

/* ── Footer ──────────────────────────────────────────────── */
.site-footer {
  border-top: 1px solid var(--paper-shadow);
  padding: clamp(0.75rem, 2.5vw, 1rem) clamp(1rem, 5vw, 2rem);
  text-align: center;
}

.site-footer p {
  font-family: var(--sans);
  font-size: clamp(0.625rem, 2vw, 0.75rem);
  color: var(--ink-light);
  letter-spacing: 0.1em;
}

/* ── Responsive ──────────────────────────────────────────── */
@media (min-width: 600px) {
  .action-area { flex-direction: row; justify-content: center; }
  .remain-count { margin-left: 0.5rem; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition: none !important; animation: none !important; }
}