:root {
  --bg: #0d0d1a;
  --panel: #1a1a2e;
  --accent: #d4af37;
  --text: #e8e8f0;
  --muted: #8888a0;
  --common: #5a6478;
  --rare: #3b82f6;
  --epic: #a855f7;
  --card-w: 180px;
  --card-h: 252px;
}

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

[hidden] { display: none !important; }

body {
  background: radial-gradient(ellipse at top, #1a1a3e 0%, var(--bg) 60%);
  color: var(--text);
  font-family: system-ui, -apple-system, sans-serif;
  min-height: 100vh;
}

header {
  display: flex;
  align-items: center;
  gap: 2rem;
  padding: 1rem 2rem;
  border-bottom: 1px solid #2a2a4a;
  background: rgba(26, 26, 46, 0.9);
}

h1 { font-size: 1.8rem; color: var(--accent); }

nav { display: flex; gap: 0.5rem; }

.nav-btn {
  background: transparent;
  border: 1px solid #3a3a5a;
  color: var(--muted);
  padding: 0.6rem 1.5rem;
  border-radius: 8px;
  cursor: pointer;
  font-size: 1.15rem;
  transition: all 0.2s;
}

.nav-btn.active { color: var(--accent); border-color: var(--accent); }
.nav-btn:hover { color: var(--text); }

.badge {
  background: var(--epic);
  color: white;
  border-radius: 999px;
  padding: 0.1rem 0.5rem;
  font-size: 0.8rem;
}

.user-info { margin-left: auto; color: var(--muted); }

main { padding: 2.5rem; display: flex; justify-content: center; }
.view { width: 100%; max-width: 1400px; }

.empty {
  text-align: center;
  color: var(--muted);
  padding: 4rem 0;
  line-height: 2;
}

/* ===== Login ===== */

.login-box {
  margin: 14vh auto 0;
  max-width: 480px;
  text-align: center;
  padding: 3rem 2.5rem;
  background: linear-gradient(180deg, #2a2a45 0%, #202038 100%);
  border: 1px solid rgba(212, 175, 55, 0.35);
  border-radius: 14px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.5);
}

.login-title { color: var(--accent); margin: 0 0 1rem; font-size: 1.8rem; }
.login-subtitle { color: var(--muted); margin: 0 0 2rem; line-height: 1.6; }

.btn-twitch {
  display: inline-block;
  padding: 0.8rem 2.2rem;
  background: #9146ff;
  color: #fff;
  font-weight: 600;
  font-size: 1.05rem;
  border-radius: 8px;
  text-decoration: none;
  transition: transform 0.15s, box-shadow 0.15s;
}

.btn-twitch:hover { transform: translateY(-2px); box-shadow: 0 6px 18px rgba(145, 70, 255, 0.45); }

.btn-logout {
  margin-left: 0.75rem;
  padding: 0.25rem 0.8rem;
  background: transparent;
  border: 1px solid var(--muted);
  border-radius: 6px;
  color: var(--muted);
  font-size: 0.8rem;
  cursor: pointer;
  transition: color 0.15s, border-color 0.15s;
}

.btn-logout:hover { color: var(--accent); border-color: var(--accent); }

/* ===== Collection book ===== */

.collection-progress {
  text-align: center;
  color: var(--accent);
  font-size: 1.3rem;
  font-weight: 600;
  margin-bottom: 1.5rem;
}

.book {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
}

.book-pages {
  display: grid;
  grid-template-columns: repeat(4, var(--card-w));
  grid-template-rows: repeat(2, var(--card-h));
  gap: 1rem;
  padding: 2rem;
  background: linear-gradient(180deg, #2a2a45 0%, #202038 100%);
  border-radius: 12px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.5), inset 0 0 60px rgba(0, 0, 0, 0.3);
}

.book-arrow {
  background: transparent;
  border: none;
  color: var(--accent);
  font-size: 3rem;
  cursor: pointer;
  padding: 0 1rem;
  transition: transform 0.15s;
}

.book-arrow:hover:not(:disabled) { transform: scale(1.3); }
.book-arrow:disabled { opacity: 0.2; cursor: default; }

.book-counter {
  text-align: center;
  color: var(--muted);
  margin-top: 1rem;
}

/* ===== Cards ===== */

.card {
  width: var(--card-w);
  height: var(--card-h);
  border-radius: 10px;
  background: #33334d;
  border: 2px solid var(--common);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: transform 0.2s;
}

.card:hover { transform: translateY(-5px) rotate(-1deg) scale(1.02); }

.card img { width: 100%; height: 100%; object-fit: cover; }

.card .card-name {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  background: rgba(13, 13, 26, 0.85);
  font-size: 0.75rem;
  text-align: center;
  padding: 0.25rem;
}

.card.rare { border-color: var(--rare); box-shadow: 0 0 20px rgba(59, 130, 246, 0.55); }
.card.epic {
  border-color: var(--epic);
  box-shadow: 0 0 24px rgba(168, 85, 247, 0.65);
}

.card-placeholder {
  border: 2px dashed #3a3a5a;
  border-radius: 10px;
  background: transparent;
}

.card-slot-label {
  display: flex;
  align-items: center;
  justify-content: center;
  color: #3a3a5a;
  font-size: 2rem;
  width: var(--card-w);
  height: var(--card-h);
}

/* ===== Packs grid ===== */

.packs-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  justify-content: center;
}

.pack {
  position: relative;
  width: 200px;
  height: 280px;
  background: linear-gradient(160deg, #3d2a6e 0%, #1e1440 100%);
  border: 2px solid var(--accent);
  border-radius: 12px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-end;
  gap: 0.25rem;
  padding-bottom: 0.75rem;
  box-sizing: border-box;
  overflow: hidden;
  cursor: pointer;
  transition: transform 0.2s, box-shadow 0.2s;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.4);
}

.pack:hover { transform: translateY(-6px) scale(1.03); box-shadow: 0 8px 24px rgba(212, 175, 55, 0.3); }

/* Tile animates away when clicked, before the opening view appears. */
.pack.picking { animation: pack-pick 0.25s ease-in forwards; }

@keyframes pack-pick {
  to { transform: scale(1.25); opacity: 0; }
}

.pack .pack-bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  z-index: 0;
}
.pack .pack-label,
.pack .pack-id { position: relative; z-index: 1; }
.pack .pack-art { font-size: 5rem; }
.pack .pack-label {
  color: var(--accent);
  font-weight: 600;
  text-shadow: 0 2px 6px rgba(0, 0, 0, 0.8);
}
.pack .pack-id {
  color: var(--muted);
  font-family: monospace;
  font-size: 0.75rem;
  letter-spacing: 1px;
  text-shadow: 0 2px 6px rgba(0, 0, 0, 0.8);
}

/* ===== Pack opening ===== */

.opening-stage {
  min-height: calc(100vh - 220px);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2rem;
}

.opening-pack {
  position: relative;
  width: 240px;
  height: 336px;
  background: linear-gradient(160deg, #3d2a6e 0%, #1e1440 100%);
  border: 3px solid var(--accent);
  border-radius: 14px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-end;
  gap: 0.25rem;
  padding-bottom: 0.75rem;
  overflow: hidden;
  box-sizing: border-box;
  cursor: pointer;
  animation: pack-idle 2s ease-in-out infinite;
}

.opening-pack .pack-bg-img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  z-index: 0;
}
.opening-pack .pack-art,
.opening-pack .pack-name,
.opening-pack .pack-id { position: relative; z-index: 1; }
.opening-pack .pack-art { font-size: 6rem; }
.opening-pack .pack-name {
  color: var(--accent);
  font-size: 1.4rem;
  font-weight: 600;
  text-shadow: 0 2px 6px rgba(0, 0, 0, 0.8);
}
.opening-pack .pack-id {
  color: var(--muted);
  font-family: monospace;
  font-size: 0.85rem;
  letter-spacing: 1px;
  text-shadow: 0 2px 6px rgba(0, 0, 0, 0.8);
}

@keyframes pack-idle {
  0%, 100% { transform: rotate(0deg); }
  25% { transform: rotate(-2deg) translateY(-4px); }
  75% { transform: rotate(2deg) translateY(-4px); }
}

.opening-pack.shaking { animation: pack-shake 0.5s ease-in-out; }

/* Pack springs in when the opening view appears. */
.opening-pack.entering { animation: pack-enter 0.4s cubic-bezier(0.34, 1.56, 0.64, 1); }

@keyframes pack-enter {
  from { transform: scale(0.55); opacity: 0; }
  to { transform: scale(1); opacity: 1; }
}

@keyframes pack-shake {
  0%, 100% { transform: translateX(0) rotate(0); }
  20% { transform: translateX(-8px) rotate(-4deg); }
  40% { transform: translateX(8px) rotate(4deg); }
  60% { transform: translateX(-6px) rotate(-3deg); }
  80% { transform: translateX(6px) rotate(3deg); }
}

.opening-pack.burst { animation: pack-burst 0.6s ease-out forwards; }

@keyframes pack-burst {
  0% { transform: scale(1); opacity: 1; }
  60% { transform: scale(1.15); opacity: 0.8; }
  100% { transform: scale(1.6); opacity: 0; }
}

.cards-stack {
  display: flex;
  gap: 1.5rem;
  flex-wrap: wrap;
  justify-content: center;
}

.flip-card {
  width: var(--card-w);
  height: var(--card-h);
  perspective: 800px;
  cursor: pointer;
  animation: card-fly 0.5s ease-out backwards;
  transition: transform 0.2s;
}

.flip-card:hover:not(.flipped) { transform: translateY(-8px) rotate(-1.5deg) scale(1.04); }

@keyframes card-fly {
  from { transform: translateY(120px) scale(0.5); opacity: 0; }
  to { transform: translateY(0) scale(1); opacity: 1; }
}

.flip-inner {
  width: 100%;
  height: 100%;
  position: relative;
  transform-style: preserve-3d;
  transition: transform 1.4s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.flip-card.flipped .flip-inner { transform: rotateY(180deg); }

.flip-face {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.flip-back {
  background: linear-gradient(160deg, #3d2a6e 0%, #1e1440 100%);
  border: 2px solid var(--accent);
  font-size: 3rem;
}

.flip-back img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 8px;
}

/* Rarity glow hint on hover, before the reveal. */
.flip-card.rare:hover .flip-back,
.flip-card.epic:hover .flip-back {
  box-shadow: 0 0 18px rgba(59, 130, 246, 0.55);
  animation: back-rare-pulse 1.8s ease-in-out infinite;
}

.flip-card.epic:hover .flip-back {
  box-shadow: 0 0 22px rgba(168, 85, 247, 0.65);
  animation: back-epic-pulse 1.4s ease-in-out infinite;
}

@keyframes back-rare-pulse {
  0%, 100% { box-shadow: 0 0 10px rgba(59, 130, 246, 0.4); }
  50% { box-shadow: 0 0 22px rgba(59, 130, 246, 0.75); }
}

@keyframes back-epic-pulse {
  0%, 100% { box-shadow: 0 0 12px rgba(168, 85, 247, 0.5); }
  50% { box-shadow: 0 0 28px rgba(168, 85, 247, 0.9); }
}

.flip-front { transform: rotateY(180deg); }

.flip-card.flipped.epic { animation: epic-glow 1s ease-out; }

@keyframes epic-glow {
  0% { filter: brightness(3) drop-shadow(0 0 30px var(--epic)); transform: scale(1.2); }
  100% { filter: brightness(1); transform: scale(1); }
}

.flip-card.flipped.rare { animation: rare-glow 0.8s ease-out; }

@keyframes rare-glow {
  0% { filter: brightness(2) drop-shadow(0 0 20px var(--rare)); transform: scale(1.1); }
  100% { filter: brightness(1); transform: scale(1); }
}

.new-badge {
  position: absolute;
  top: -10px;
  right: -10px;
  background: var(--epic);
  color: white;
  font-size: 0.7rem;
  font-weight: 700;
  padding: 0.2rem 0.5rem;
  border-radius: 999px;
  z-index: 2;
  animation: new-pop 0.4s cubic-bezier(0.34, 1.56, 0.64, 1) 0.3s backwards;
}

@keyframes new-pop {
  from { transform: scale(0); }
  to { transform: scale(1); }
}

.reveal-hint { color: var(--muted); animation: pulse 1.5s ease-in-out infinite; }

@keyframes pulse {
  0%, 100% { opacity: 0.5; }
  50% { opacity: 1; }
}

.btn-done {
  background: var(--accent);
  color: #0d0d1a;
  border: none;
  font-size: 1.1rem;
  font-weight: 700;
  padding: 0.8rem 2.5rem;
  border-radius: 10px;
  cursor: pointer;
  transition: transform 0.15s;
}

.btn-done:hover { transform: scale(1.05); }

/* ===== Card modal ===== */

.card-modal {
  position: fixed;
  inset: 0;
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
}

.card-modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(5, 5, 15, 0.88);
}

.card-modal-body {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
  animation: modal-pop 0.25s cubic-bezier(0.34, 1.56, 0.64, 1);
}

@keyframes modal-pop {
  from { transform: scale(0.7); opacity: 0; }
  to { transform: scale(1); opacity: 1; }
}

.card-modal-image {
  width: 380px;
  height: 532px;
  border-radius: 14px;
  overflow: hidden;
  border: 3px solid var(--common);
  box-shadow: 0 12px 48px rgba(0, 0, 0, 0.7);
  background: #33334d;
}

.card-modal-image img { width: 100%; height: 100%; object-fit: cover; }

.card-modal-image.rare { border-color: var(--rare); box-shadow: 0 12px 48px rgba(59, 130, 246, 0.4); }
.card-modal-image.epic { border-color: var(--epic); box-shadow: 0 12px 48px rgba(168, 85, 247, 0.5); }

.card-modal-name { font-size: 1.6rem; font-weight: 700; }

.card-modal-rarity {
  font-size: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--muted);
}

.card-modal-rarity.rare { color: var(--rare); }
.card-modal-rarity.epic { color: var(--epic); }