/* ──────────────────────────────────────────────
   튜토리얼 슬라이드 (PPT 형식)
   .deck > .slides > .slide(.active / .before / .after)
   ────────────────────────────────────────────── */

.deck {
  position: relative;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 12px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.deck:fullscreen {
  border-radius: 0;
  border: none;
  justify-content: center;
}

/* 16:9 화면 */
.slides {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  max-height: calc(100vh - 230px);
  min-height: 420px;
  overflow: hidden;
  background:
    radial-gradient(ellipse at 85% 10%, rgba(230, 184, 92, 0.10), transparent 55%),
    radial-gradient(ellipse at 10% 95%, rgba(91, 155, 213, 0.08), transparent 50%),
    var(--panel);
  touch-action: pan-y;
}
.deck:fullscreen .slides { max-height: calc(100vh - 70px); }

.slide {
  position: absolute;
  inset: 0;
  padding: clamp(24px, 4.5vw, 64px) clamp(24px, 6vw, 88px);
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
  gap: clamp(20px, 4vw, 56px);
  align-items: center;
  opacity: 0;
  visibility: hidden;
  transform: translateX(60px);
  transition: opacity 0.45s ease, transform 0.45s ease, visibility 0s linear 0.45s;
}
.slide.before { transform: translateX(-60px); }
.slide.active {
  opacity: 1;
  visibility: visible;
  transform: none;
  transition: opacity 0.45s ease, transform 0.45s ease, visibility 0s;
}

/* 글 없이 그림만, 또는 표지처럼 가운데 정렬 */
.slide.center {
  grid-template-columns: 1fr;
  text-align: center;
  justify-items: center;
}

.slide .kicker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--gold);
  font-size: clamp(11px, 1.1vw, 14px);
  font-weight: bold;
  letter-spacing: 2px;
  margin-bottom: 12px;
}
.slide .kicker::before {
  content: '';
  width: 28px;
  height: 2px;
  background: var(--gold);
}
.slide.center .kicker::before { display: none; }

.slide h2 {
  font-size: clamp(24px, 3.4vw, 48px);
  line-height: 1.2;
  margin-bottom: clamp(12px, 1.6vw, 22px);
  letter-spacing: -0.5px;
}
.slide h2 em { font-style: normal; color: var(--gold); }

.slide .lead {
  font-size: clamp(14px, 1.45vw, 20px);
  color: var(--muted);
  line-height: 1.6;
  margin-bottom: clamp(12px, 1.6vw, 22px);
}

.slide ul.points { list-style: none; display: flex; flex-direction: column; gap: clamp(8px, 1vw, 14px); }
.slide ul.points li {
  position: relative;
  padding-left: 26px;
  font-size: clamp(13px, 1.3vw, 18px);
  line-height: 1.55;
}
.slide ul.points li::before {
  content: '';
  position: absolute;
  left: 4px;
  top: 0.6em;
  width: 9px;
  height: 9px;
  border-radius: 2px;
  background: var(--gold);
  transform: rotate(45deg);
}
.slide ul.points b { color: var(--gold); }

/* 표지 */
.slide .cover-logo {
  width: clamp(64px, 8vw, 110px);
  height: clamp(64px, 8vw, 110px);
  border: 2px solid var(--gold);
  border-radius: 22px;
  display: grid;
  place-items: center;
  font-size: clamp(32px, 4.5vw, 60px);
  color: var(--gold);
  margin-bottom: 18px;
}
.slide.cover h2 { font-size: clamp(34px, 5.4vw, 76px); }
.slide .hint-keys { color: var(--muted); font-size: clamp(12px, 1.1vw, 15px); margin-top: 18px; }
.slide kbd {
  display: inline-block;
  min-width: 26px;
  padding: 2px 7px;
  border: 1px solid var(--line);
  border-bottom-width: 3px;
  border-radius: 5px;
  background: var(--panel-2);
  font-family: inherit;
  color: var(--text);
}

/* 그림 영역 */
.visual {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 14px;
}
.visual .caption { color: var(--muted); font-size: clamp(11px, 1vw, 14px); text-align: center; }

/* 큰 숫자 카드 */
.big-stat {
  border: 1px solid var(--line);
  background: var(--panel-2);
  border-radius: 14px;
  padding: clamp(18px, 2.4vw, 34px) clamp(26px, 3.4vw, 48px);
  text-align: center;
}
.big-stat b { display: block; font-size: clamp(54px, 8vw, 120px); color: var(--gold); line-height: 1; }
.big-stat span { color: var(--muted); font-size: clamp(13px, 1.3vw, 18px); }

/* 표 */
.slide-table { width: 100%; border-collapse: collapse; font-size: clamp(13px, 1.3vw, 18px); }
.slide-table th, .slide-table td { padding: clamp(8px, 1vw, 14px) clamp(10px, 1.2vw, 16px); border-bottom: 1px solid var(--line); text-align: left; }
.slide-table th { color: var(--muted); font-weight: normal; font-size: 0.85em; }
.slide-table td.num { color: var(--gold); font-weight: bold; font-size: 1.25em; text-align: right; }

/* 공식 */
.formula {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: clamp(8px, 1vw, 14px);
  flex-wrap: wrap;
  font-size: clamp(14px, 1.4vw, 20px);
  font-weight: bold;
}
.formula .term {
  padding: clamp(10px, 1.2vw, 16px) clamp(12px, 1.6vw, 22px);
  border-radius: 10px;
  border: 1px solid var(--line);
  background: var(--panel-2);
}
.formula .term.atk { border-color: #a8362d; color: #ff9a90; }
.formula .term.def { border-color: #2e6aa8; color: #9cc8f0; }
.formula .op { color: var(--gold); font-size: 1.4em; }

/* 칸 지도 그림: .mini-map 안에 .cell 들 */
.mini-map {
  display: grid;
  grid-template-columns: repeat(var(--cols, 5), clamp(38px, 4.6vw, 66px));
  gap: 6px;
}
.cell {
  aspect-ratio: 1;
  border-radius: 8px;
  background: var(--land);
  opacity: 0.35;
  display: grid;
  place-items: center;
  font-size: clamp(12px, 1.3vw, 19px);
  font-weight: bold;
  color: #1a1408;
  position: relative;
}
.cell.sea { background: transparent; opacity: 1; }
.cell.mine { background: #3f7fd9; opacity: 0.95; color: #fff; }
.cell.enemy { background: #e05a47; opacity: 0.9; color: #fff; }
.cell.ally { background: #3aa65b; opacity: 0.9; color: #fff; }
.cell.isolated { background: #3f7fd9; opacity: 0.45; color: #fff; outline: 2px dashed #9a9a9a; outline-offset: -2px; }
.cell.target { opacity: 1; outline: 3px dashed #e05a4f; outline-offset: -3px; }
.cell.chain { opacity: 1; outline: 3px dashed #e08a2a; outline-offset: -3px; }
.cell.order { opacity: 1; outline: 3px solid #e05a4f; outline-offset: -3px; }
.cell.capital::after { content: '♛'; position: absolute; top: -10px; right: -4px; color: #ffd15c; font-size: 1.1em; text-shadow: 0 0 3px #000; }
.cell.station::before { content: ''; position: absolute; width: 30%; height: 30%; border-radius: 50%; background: #fff; border: 2px solid #222; }
.cell.port::before { content: ''; position: absolute; width: 30%; height: 30%; border-radius: 50%; background: #2f6690; border: 2px solid #fff; }

/* 순서 단계 */
.steps { display: flex; flex-direction: column; gap: clamp(8px, 1vw, 14px); width: 100%; }
.step {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 14px;
  align-items: center;
  padding: clamp(10px, 1.2vw, 16px) clamp(12px, 1.4vw, 20px);
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--panel-2);
  font-size: clamp(13px, 1.25vw, 17px);
}
.step .no {
  width: clamp(28px, 2.6vw, 38px);
  height: clamp(28px, 2.6vw, 38px);
  border-radius: 50%;
  background: var(--gold);
  color: #1a1408;
  display: grid;
  place-items: center;
  font-weight: bold;
}
.step small { display: block; color: var(--muted); font-size: 0.85em; margin-top: 2px; }

.slide.center .steps { text-align: left; max-width: 760px; margin: 0 auto; }

/* 하단 조작부 */
.deck-nav {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 18px;
  border-top: 1px solid var(--line);
  background: rgba(13, 12, 10, 0.6);
}
.deck-nav .btn.icon { font-size: 20px; }
.deck-dots { display: flex; gap: 6px; flex: 1; justify-content: center; flex-wrap: wrap; }
.deck-dots button {
  width: 10px;
  height: 10px;
  padding: 0;
  border-radius: 50%;
  border: none;
  background: var(--line);
  transition: width 0.25s, background 0.25s;
}
.deck-dots button:hover { background: var(--muted); }
.deck-dots button.active { width: 28px; border-radius: 5px; background: var(--gold); }
.deck-count { color: var(--muted); font-size: 13px; min-width: 52px; text-align: right; font-variant-numeric: tabular-nums; }

/* 진행 막대 */
.deck-progress { height: 3px; background: var(--line); }
.deck-progress div { height: 100%; background: var(--gold); width: 0; transition: width 0.45s ease; }

/* 좁은 화면: 글 위, 그림 아래 */
@media (max-width: 900px) {
  .slides { aspect-ratio: auto; height: auto; min-height: 560px; max-height: none; }
  .slide { grid-template-columns: 1fr; align-content: center; overflow-y: auto; }
  .visual { order: 2; }
}