/* ============================================================
   원소 배틀 아레나 - 스타일
   우주/에너지 느낌의 어둡고 화려한 테마 (보라/청록 계열)
   ============================================================ */

* { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --bg-deep: #0b0620;
  --bg-mid: #1a1040;
  --accent-purple: #8b5cf6;
  --accent-teal: #2dd4bf;
  --accent-pink: #f472b6;
  --accent-gold: #fbbf24;
  --text-main: #f1eaff;
  --text-dim: #b7a8e0;
  --card-w: 150px;
  --card-h: 210px;
}

html { font-size: 17px; }

body {
  font-family: "Pretendard", "Apple SD Gothic Neo", "Malgun Gothic", "Noto Sans KR", sans-serif;
  color: var(--text-main);
  min-height: 100vh;
  background:
    radial-gradient(ellipse at 20% 10%, rgba(139, 92, 246, 0.35), transparent 55%),
    radial-gradient(ellipse at 85% 30%, rgba(45, 212, 191, 0.22), transparent 50%),
    radial-gradient(ellipse at 50% 95%, rgba(244, 114, 182, 0.18), transparent 55%),
    linear-gradient(180deg, var(--bg-deep) 0%, var(--bg-mid) 55%, #071226 100%);
  background-attachment: fixed;
  overflow-x: hidden;
}

/* 반짝이는 별 배경 */
.stars-bg {
  position: fixed; inset: 0; z-index: -1; pointer-events: none;
  background-image:
    radial-gradient(1.5px 1.5px at 12% 22%, #fff, transparent),
    radial-gradient(1px 1px at 32% 68%, #a5f3fc, transparent),
    radial-gradient(2px 2px at 55% 15%, #e9d5ff, transparent),
    radial-gradient(1px 1px at 71% 44%, #fff, transparent),
    radial-gradient(1.5px 1.5px at 86% 76%, #99f6e4, transparent),
    radial-gradient(1px 1px at 44% 88%, #fbcfe8, transparent),
    radial-gradient(1.5px 1.5px at 92% 12%, #fff, transparent),
    radial-gradient(1px 1px at 8% 82%, #c4b5fd, transparent);
  animation: twinkle 5s ease-in-out infinite alternate;
}
@keyframes twinkle { from { opacity: 0.5; } to { opacity: 1; } }

/* ---------- 헤더 ---------- */
.app-header { text-align: center; padding: 24px 16px 8px; }

.app-title {
  font-size: 2.3rem; letter-spacing: 1px;
  background: linear-gradient(90deg, var(--accent-teal), var(--accent-purple), var(--accent-pink));
  -webkit-background-clip: text; background-clip: text; color: transparent;
  text-shadow: 0 0 30px rgba(139, 92, 246, 0.45);
}
.title-icon { -webkit-text-fill-color: initial; }
.title-sub { display: block; font-size: 0.95rem; color: var(--text-dim); font-weight: 400; letter-spacing: 4px; }

/* ---------- API 키 입력 ---------- */
.api-key-box {
  max-width: 760px; margin: 16px auto 0; padding: 12px 18px;
  background: rgba(20, 12, 50, 0.7);
  border: 1px solid rgba(139, 92, 246, 0.4);
  border-radius: 14px;
  backdrop-filter: blur(6px);
}
.api-key-row { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; justify-content: center; }
.api-key-row label { font-weight: 700; color: var(--accent-teal); }
#api-key-input {
  flex: 1; min-width: 220px; padding: 9px 14px; font-size: 0.95rem;
  border-radius: 10px; border: 1px solid rgba(45, 212, 191, 0.4);
  background: rgba(5, 3, 20, 0.8); color: var(--text-main); outline: none;
}
#api-key-input:focus { border-color: var(--accent-teal); box-shadow: 0 0 10px rgba(45, 212, 191, 0.35); }
.api-key-status { font-size: 0.9rem; color: var(--accent-gold); min-width: 70px; }
.api-key-notice { margin-top: 8px; font-size: 0.82rem; color: var(--text-dim); line-height: 1.5; }

/* ---------- 화면 전환 ---------- */
.screen { display: none; max-width: 1000px; margin: 0 auto; padding: 20px 16px 60px; text-align: center; }
.screen.active { display: block; animation: screenIn 0.5s ease; }
@keyframes screenIn { from { opacity: 0; transform: translateY(18px); } to { opacity: 1; transform: none; } }

/* ---------- 버튼 ---------- */
.btn {
  cursor: pointer; border: none; border-radius: 12px;
  font-family: inherit; font-weight: 800; color: #fff;
  background: linear-gradient(135deg, var(--accent-purple), #6d28d9);
  padding: 12px 22px; font-size: 1.05rem;
  box-shadow: 0 4px 16px rgba(139, 92, 246, 0.45);
  transition: transform 0.15s ease, box-shadow 0.15s ease, filter 0.15s ease;
}
.btn:hover { transform: translateY(-2px) scale(1.03); filter: brightness(1.15); }
.btn:active { transform: scale(0.97); }
.btn-small { padding: 8px 16px; font-size: 0.9rem; }
.btn-big { padding: 16px 40px; font-size: 1.3rem; margin-top: 22px; }
.btn-glow { animation: btnPulse 1.8s ease-in-out infinite; }
@keyframes btnPulse {
  0%, 100% { box-shadow: 0 0 14px rgba(139, 92, 246, 0.5); }
  50% { box-shadow: 0 0 30px rgba(45, 212, 191, 0.8); }
}

/* ---------- 시작 화면 ---------- */
.intro-box h2 { font-size: 1.7rem; margin: 10px 0; color: var(--accent-gold); text-shadow: 0 0 18px rgba(251, 191, 36, 0.4); }
.intro-text { font-size: 1.1rem; line-height: 1.7; color: var(--text-main); }

.rules-grid { display: flex; flex-wrap: wrap; gap: 14px; justify-content: center; margin: 22px 0 10px; }
.rule-card {
  flex: 1; min-width: 210px; max-width: 290px; padding: 16px;
  background: rgba(26, 16, 64, 0.75);
  border: 1px solid rgba(45, 212, 191, 0.35); border-radius: 16px;
  box-shadow: 0 6px 22px rgba(0, 0, 0, 0.4);
}
.rule-card .rule-icon { font-size: 2rem; }
.rule-card h3 { color: var(--accent-teal); margin: 6px 0; font-size: 1.15rem; }
.rule-card p { font-size: 0.95rem; line-height: 1.55; color: var(--text-main); }
.rule-card strong { color: var(--accent-gold); }

.combo-rules {
  margin: 16px auto; max-width: 640px; padding: 14px 20px;
  background: rgba(244, 114, 182, 0.09);
  border: 1px dashed rgba(244, 114, 182, 0.5); border-radius: 14px;
  text-align: left; font-size: 0.98rem; line-height: 1.9;
}

/* ---------- 카드 ---------- */
.hand-title { margin: 26px 0 12px; font-size: 1.15rem; color: var(--text-dim); }
.hand-row { display: flex; flex-wrap: wrap; gap: 14px; justify-content: center; min-height: calc(var(--card-h) + 10px); }

.element-card {
  width: var(--card-w); height: var(--card-h);
  border-radius: 14px; position: relative; overflow: hidden;
  background: linear-gradient(160deg, #241456 0%, #120a30 100%);
  border: 2px solid var(--card-edge, var(--accent-purple));
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.55), 0 0 14px var(--card-glow, rgba(139, 92, 246, 0.35));
  display: flex; flex-direction: column; align-items: center;
  padding: 10px 8px; user-select: none;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  animation: cardDeal 0.45s ease backwards;
}
.element-card.clickable { cursor: pointer; }
.element-card.clickable:hover {
  transform: translateY(-10px) rotate(-1.5deg) scale(1.05);
  box-shadow: 0 14px 30px rgba(0, 0, 0, 0.6), 0 0 26px var(--card-glow, rgba(139, 92, 246, 0.7));
  z-index: 2;
}
@keyframes cardDeal { from { opacity: 0; transform: translateY(30px) rotate(6deg); } to { opacity: 1; transform: none; } }

.element-card .card-number { position: absolute; top: 7px; left: 10px; font-size: 0.8rem; color: var(--text-dim); }
.element-card .card-category {
  position: absolute; top: 6px; right: 8px; font-size: 0.62rem; padding: 2px 6px;
  border-radius: 999px; background: var(--card-edge, var(--accent-purple)); color: #0b0620; font-weight: 800;
}
.element-card .card-symbol {
  font-size: 2.4rem; font-weight: 900; margin-top: 16px; line-height: 1;
  color: #fff; text-shadow: 0 0 16px var(--card-glow, rgba(139, 92, 246, 0.8));
}
.element-card .card-name { font-size: 0.98rem; font-weight: 700; margin: 3px 0 7px; color: var(--text-main); }
.element-card .card-stats { width: 100%; font-size: 0.73rem; text-align: left; display: grid; gap: 3px; }
.element-card .card-stats .stat-line {
  display: flex; justify-content: space-between; align-items: center; gap: 4px;
  padding: 3px 7px; white-space: nowrap;
  background: rgba(255, 255, 255, 0.07); border-radius: 6px;
}
.element-card .card-stats .stat-value { font-weight: 800; color: var(--accent-teal); }
.element-card .card-stats .stat-value small { font-size: 0.58rem; font-weight: 500; opacity: 0.85; margin-left: 1px; }

/* 카테고리별 카드 색상 */
.cat-alkali          { --card-edge: #f97316; --card-glow: rgba(249, 115, 22, 0.5); }
.cat-alkaline-earth  { --card-edge: #facc15; --card-glow: rgba(250, 204, 21, 0.5); }
.cat-transition      { --card-edge: #60a5fa; --card-glow: rgba(96, 165, 250, 0.5); }
.cat-halogen         { --card-edge: #4ade80; --card-glow: rgba(74, 222, 128, 0.5); }
.cat-noble           { --card-edge: #c084fc; --card-glow: rgba(192, 132, 252, 0.55); }
.cat-nonmetal        { --card-edge: #2dd4bf; --card-glow: rgba(45, 212, 191, 0.5); }
.cat-metalloid       { --card-edge: #f472b6; --card-glow: rgba(244, 114, 182, 0.5); }
.cat-post-transition { --card-edge: #94a3b8; --card-glow: rgba(148, 163, 184, 0.5); }

/* ---------- 스코어보드 ---------- */
.scoreboard {
  display: flex; justify-content: space-between; align-items: center;
  max-width: 720px; margin: 0 auto 18px; padding: 12px 22px;
  background: rgba(20, 12, 50, 0.75); border: 1px solid rgba(139, 92, 246, 0.4);
  border-radius: 16px; box-shadow: 0 4px 18px rgba(0, 0, 0, 0.4);
}
.score-side { display: flex; flex-direction: column; gap: 4px; }
.score-label { font-size: 0.9rem; color: var(--text-dim); font-weight: 700; }
.score-stars { font-size: 1.35rem; letter-spacing: 3px; min-height: 1.6rem; }
.round-indicator { font-size: 1.45rem; font-weight: 900; color: var(--accent-gold); text-shadow: 0 0 14px rgba(251, 191, 36, 0.5); }
.energy-score { font-size: 0.88rem; color: var(--text-dim); margin-top: 2px; }

/* ---------- 아레나 ---------- */
.arena { display: flex; align-items: center; justify-content: center; gap: 22px; margin: 8px 0 14px; flex-wrap: wrap; }
.arena-slot .slot-label { font-size: 0.95rem; color: var(--text-dim); margin-bottom: 8px; font-weight: 700; }
.slot-card { width: var(--card-w); height: var(--card-h); margin: 0 auto; }
.card-placeholder {
  width: 100%; height: 100%; border-radius: 14px;
  border: 2px dashed rgba(183, 168, 224, 0.4);
  display: flex; align-items: center; justify-content: center;
  color: var(--text-dim); font-size: 0.95rem; line-height: 1.5;
}
.card-back {
  font-size: 3.5rem; font-weight: 900; color: var(--accent-purple);
  background: repeating-linear-gradient(45deg, #1c0f45, #1c0f45 12px, #251659 12px, #251659 24px);
  border: 2px solid var(--accent-purple);
}
.vs-badge {
  font-size: 2.2rem; font-weight: 900; font-style: italic;
  background: linear-gradient(180deg, var(--accent-gold), #f97316);
  -webkit-background-clip: text; background-clip: text; color: transparent;
  text-shadow: 0 0 24px rgba(251, 191, 36, 0.5);
}
.vs-badge.clash { animation: vsClash 0.6s ease; }
@keyframes vsClash {
  0% { transform: scale(1); } 35% { transform: scale(1.9) rotate(-8deg); }
  70% { transform: scale(0.9) rotate(5deg); } 100% { transform: scale(1); }
}

/* 승/패 카드 강조 */
.slot-card .element-card.winner { animation: winnerGlow 0.9s ease; box-shadow: 0 0 34px rgba(251, 191, 36, 0.85), 0 6px 20px rgba(0,0,0,0.5); border-color: var(--accent-gold); }
@keyframes winnerGlow { 0% { transform: scale(1); } 40% { transform: scale(1.12) translateY(-8px); } 100% { transform: scale(1); } }
.slot-card .element-card.loser { filter: grayscale(0.55) brightness(0.75); transition: filter 0.5s ease; }

/* ---------- 스탯 선택 ---------- */
.stat-choice-title { font-size: 1.2rem; font-weight: 800; margin-bottom: 10px; color: var(--accent-teal); }
.stat-buttons { display: flex; flex-wrap: wrap; gap: 12px; justify-content: center; }
.stat-btn { display: flex; flex-direction: column; gap: 3px; min-width: 200px; }
.stat-btn[data-stat="electronegativity"] { background: linear-gradient(135deg, #db2777, #9d174d); }
.stat-btn[data-stat="atomicRadius"]      { background: linear-gradient(135deg, #0d9488, #115e59); }
.stat-btn[data-stat="ionizationEnergy"]  { background: linear-gradient(135deg, #d97706, #92400e); }
.stat-hint { font-size: 0.78rem; font-weight: 500; opacity: 0.9; }

/* ---------- 콤보 배너 (3단계) ---------- */
.combo-banner {
  max-width: 640px; margin: 6px auto 14px; padding: 13px 20px;
  border-radius: 14px; font-size: 1.1rem; font-weight: 800; line-height: 1.55;
}
.combo-banner.combo-ionic {
  background: linear-gradient(90deg, rgba(249, 115, 22, 0.25), rgba(244, 114, 182, 0.25), rgba(249, 115, 22, 0.25));
  background-size: 200% 100%;
  border: 2px solid var(--accent-gold); color: var(--accent-gold);
  animation: comboShine 1.2s linear infinite, comboPop 0.5s ease;
  text-shadow: 0 0 12px rgba(251, 191, 36, 0.6);
}
.combo-banner.combo-family {
  background: rgba(45, 212, 191, 0.14);
  border: 2px solid var(--accent-teal); color: var(--accent-teal);
  animation: comboPop 0.5s ease;
}
.combo-banner.combo-none {
  background: rgba(148, 163, 184, 0.12);
  border: 2px dashed #94a3b8; color: #cbd5e1; font-weight: 600; font-size: 0.98rem;
}
.combo-banner .combo-sub { display: block; font-size: 0.85rem; font-weight: 500; color: var(--text-main); margin-top: 4px; }
@keyframes comboShine { from { background-position: 0% 0; } to { background-position: 200% 0; } }
@keyframes comboPop { 0% { transform: scale(0.6); opacity: 0; } 60% { transform: scale(1.08); } 100% { transform: scale(1); opacity: 1; } }

/* ---------- 파티클 이펙트 ---------- */
.particles { position: fixed; inset: 0; pointer-events: none; overflow: hidden; z-index: 50; }
.particle {
  position: absolute; font-size: 1.6rem;
  animation: particleFly var(--dur, 1.4s) ease-out forwards;
}
@keyframes particleFly {
  0%   { opacity: 1; transform: translate(0, 0) scale(0.6) rotate(0deg); }
  100% { opacity: 0; transform: translate(var(--dx, 0px), var(--dy, -180px)) scale(1.5) rotate(var(--rot, 180deg)); }
}

/* ---------- 라운드 결과 ---------- */
.round-result { max-width: 680px; margin: 10px auto; }
.round-result-text { font-size: 1.6rem; font-weight: 900; margin: 8px 0; }
.round-result-text.win  { color: var(--accent-gold); text-shadow: 0 0 20px rgba(251, 191, 36, 0.6); animation: comboPop 0.5s ease; }
.round-result-text.lose { color: #93c5fd; }
.round-result-text.draw { color: var(--text-dim); }
.round-explain {
  font-size: 1rem; line-height: 1.65; padding: 12px 18px;
  background: rgba(26, 16, 64, 0.7); border-radius: 12px;
  border: 1px solid rgba(45, 212, 191, 0.3);
}
.round-explain strong { color: var(--accent-teal); }

.ai-commentary {
  margin-top: 12px; padding: 13px 18px; text-align: left;
  background: rgba(139, 92, 246, 0.12);
  border: 1px solid rgba(139, 92, 246, 0.45); border-radius: 12px;
}
.ai-commentary-head { font-weight: 800; color: var(--accent-purple); margin-bottom: 5px; }
.ai-commentary-text { font-size: 0.98rem; line-height: 1.65; }
.ai-commentary-text.loading { color: var(--text-dim); animation: aiBlink 1s ease-in-out infinite; }
@keyframes aiBlink { 50% { opacity: 0.45; } }

/* ---------- 결과 화면 ---------- */
.final-result { font-size: 2.1rem; font-weight: 900; margin: 24px 0 6px; }
.final-result.win  { color: var(--accent-gold); text-shadow: 0 0 26px rgba(251, 191, 36, 0.6); }
.final-result.lose { color: #93c5fd; }
.final-result .final-sub { display: block; font-size: 1.1rem; font-weight: 600; color: var(--text-main); margin-top: 10px; }
.final-energy { font-size: 1rem; color: var(--text-dim); margin-bottom: 20px; }

.dex-box {
  max-width: 720px; margin: 0 auto; padding: 18px;
  background: rgba(20, 12, 50, 0.75); border: 1px solid rgba(139, 92, 246, 0.4); border-radius: 16px;
}
.dex-box h3 { color: var(--accent-teal); font-size: 1.25rem; }
.dex-count { margin: 8px 0 14px; font-size: 1rem; color: var(--text-main); }
.dex-count strong { color: var(--accent-gold); font-size: 1.2rem; }
.dex-grid { display: grid; grid-template-columns: repeat(9, 1fr); gap: 6px; }
.dex-cell {
  aspect-ratio: 1; border-radius: 8px; display: flex; flex-direction: column;
  align-items: center; justify-content: center; font-size: 0.85rem; font-weight: 800;
  background: rgba(255, 255, 255, 0.05); color: rgba(183, 168, 224, 0.35);
  border: 1px solid rgba(255, 255, 255, 0.07);
}
.dex-cell.met {
  background: linear-gradient(150deg, rgba(139, 92, 246, 0.4), rgba(45, 212, 191, 0.35));
  color: #fff; border-color: var(--accent-teal);
  box-shadow: 0 0 8px rgba(45, 212, 191, 0.4);
}
.dex-cell .dex-num { font-size: 0.55rem; font-weight: 500; opacity: 0.8; }

/* ---------- 푸터 ---------- */
.app-footer {
  text-align: center; padding: 14px; font-size: 0.85rem; color: var(--text-dim);
  border-top: 1px solid rgba(139, 92, 246, 0.2); margin-top: 20px;
}

.hidden { display: none !important; }

/* ---------- 모바일 ---------- */
@media (max-width: 640px) {
  :root { --card-w: 124px; --card-h: 178px; }
  html { font-size: 15px; }
  .app-title { font-size: 1.6rem; }
  .element-card .card-symbol { font-size: 2rem; }
  .dex-grid { grid-template-columns: repeat(6, 1fr); }
  .vs-badge { width: 100%; }
}