/* ============================================================
   CineAHO Premium 3D Memory Master Game Stylesheet
   Follows Galaga/SandBox design system
   ============================================================ */

/* Core Variables & Tokens */
:root {
  --hue-purple: 270;
  --hue-blue: 210;
  --hue-green: 145;
  --hue-gold: 45;
  --hue-red: 350;
  --hue-cyan: 190;

  --bg-color: #040712;
  --bg-grid: rgba(255, 255, 255, 0.015);

  --panel-bg: rgba(10, 16, 32, 0.6);
  --panel-border: rgba(255, 255, 255, 0.05);
  --panel-hover-border: rgba(59, 130, 246, 0.25);

  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-dark: #475569;

  --grad-purple: linear-gradient(135deg, #a855f7 0%, #7e22ce 100%);
  --grad-blue: linear-gradient(135deg, #3b82f6 0%, #1d4ed8 100%);
  --grad-cyan: linear-gradient(135deg, #06b6d4 0%, #0891b2 100%);
  --grad-green: linear-gradient(135deg, #10b981 0%, #047857 100%);
  --grad-gold: linear-gradient(135deg, #fbbf24 0%, #d97706 100%);
  --grad-red: linear-gradient(135deg, #f43f5e 0%, #be123c 100%);

  --neon-glow: 0 0 30px rgba(59, 130, 246, 0.2);
  --font-main: 'Noto Sans KR', 'Inter', sans-serif;
  --font-display: 'Outfit', sans-serif;
  --transition-smooth: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  --shadow-card: 0 12px 40px 0 rgba(0, 0, 0, 0.6);

  --highlight-color: #3b82f6;
  --accent-purple: #a855f7;
}

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

body {
  font-family: var(--font-main);
  background-color: var(--bg-color);
  background-image: radial-gradient(circle at center, rgba(10, 16, 32, 0.45) 0%, rgba(4, 7, 18, 0.9) 100%);
  background-size: cover;
  background-position: center;
  background-attachment: fixed;
  color: var(--text-main);
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
  line-height: 1.6;
}

/* Grid Background */
body::before {
  content: '';
  position: absolute;
  top: 0; left: 0; width: 100%; height: 100%;
  background-image:
    linear-gradient(var(--bg-grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--bg-grid) 1px, transparent 1px);
  background-size: 40px 40px;
  z-index: -2;
  pointer-events: none;
}

/* Ambient Glow Orbs */
.bg-glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(150px);
  z-index: -3;
  pointer-events: none;
  opacity: 0.18;
}
.bg-glow-purple {
  width: 500px; height: 500px;
  background: radial-gradient(circle, #7e22ce 0%, transparent 70%);
  top: -100px; left: 5%;
}
.bg-glow-blue {
  width: 600px; height: 600px;
  background: radial-gradient(circle, #1d4ed8 0%, transparent 70%);
  top: 35%; right: 5%;
}

/* ==========  HEADER  ========== */
.main-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.85rem 2rem;
  position: sticky;
  top: 0;
  z-index: 100;
  margin: 1rem 1.5rem 0 1.5rem;
  border-radius: 50px;
  transition: var(--transition-smooth);
}
.glass-header {
  background: rgba(10, 16, 32, 0.75);
  border: 1px solid rgba(255, 255, 255, 0.05);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
}
.logo-circle {
  width: 38px; height: 38px;
  background: linear-gradient(135deg, #3b82f6 0%, #1d4ed8 100%);
  color: #fff; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-display); font-weight: 800; font-size: 0.85rem;
  letter-spacing: 0.5px;
  box-shadow: 0 4px 10px rgba(59, 130, 246, 0.3);
}
.header-left { display: flex; align-items: center; gap: 0.75rem; }
.logo-text { font-family: var(--font-main); font-weight: 700; font-size: 0.95rem; }
.logo-text span { color: var(--text-muted); font-weight: 400; }
.header-nav { flex-grow: 1; margin: 0 2rem; overflow-x: auto; scrollbar-width: none; }
.header-nav::-webkit-scrollbar { display: none; }
.nav-list { display: flex; list-style: none; gap: 1.25rem; white-space: nowrap; }
.nav-list a {
  color: var(--text-muted); text-decoration: none;
  font-size: 0.85rem; font-weight: 500;
  transition: var(--transition-smooth);
  padding: 0.5rem 0.25rem; position: relative;
}
.nav-list a:hover, .nav-list a.active { color: var(--text-main); }
.nav-list a.active::after {
  content: ''; position: absolute; bottom: 0; left: 0;
  width: 100%; height: 2px; background: #3b82f6; border-radius: 2px;
}
.btn-back-dashboard {
  display: inline-flex; align-items: center; gap: 0.5rem;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 30px; padding: 0.5rem 1.2rem;
  color: var(--text-main); font-size: 0.85rem; font-weight: 600;
  cursor: pointer; transition: var(--transition-smooth);
}
.btn-back-dashboard:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: #3b82f6; transform: translateX(-2px);
}

/* ==========  COMMON GLASS PANELS  ========== */
.glass-panel {
  background: var(--panel-bg);
  border: 1px solid var(--panel-border);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-radius: 20px;
  box-shadow: var(--shadow-card);
  transition: var(--transition-smooth);
}
.glass-panel:hover { border-color: var(--panel-hover-border); }

/* ==========  APP LAYOUT  ========== */
.memory-container {
  max-width: 1024px;
  margin: 0 auto;
  padding: 2rem 1.5rem 5rem 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

/* Title Section */
.memory-header-section { text-align: center; }
.main-title {
  font-size: 2.3rem; font-weight: 900;
  margin-bottom: 0.6rem; letter-spacing: -0.5px;
  background: linear-gradient(135deg, #06b6d4 0%, #a855f7 100%);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  display: inline-flex; align-items: center; gap: 0.5rem;
}
.subtitle-desc {
  font-size: 0.95rem; color: var(--text-muted);
  max-width: 800px; margin: 0 auto 1.25rem auto; line-height: 1.6;
}
.subtitle-desc .highlight-purple { color: #c084fc; font-weight: 600; }
.subtitle-desc .highlight-blue { color: #60a5fa; font-weight: 600; }
.tag-badges { display: flex; justify-content: center; gap: 0.5rem; flex-wrap: wrap; }
.badge {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.06);
  padding: 0.25rem 0.75rem; border-radius: 30px;
  font-size: 0.75rem; font-weight: 600; color: var(--text-muted);
}
.badge-tag {
  background: rgba(6, 182, 212, 0.05);
  border-color: rgba(6, 182, 212, 0.12);
  color: #22d3ee;
}

/* ==========  STAT DASHBOARD  ========== */
.stat-dashboard-cards {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
}
.stat-card {
  padding: 1rem 1.25rem;
  display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  gap: 0.25rem; text-align: center;
}
.stat-icon {
  font-size: 0.75rem; font-weight: 700;
  display: flex; align-items: center; gap: 0.35rem;
}
.stat-icon.yellow { color: #fbbf24; }
.stat-icon.purple { color: #c084fc; }
.stat-icon.blue   { color: #60a5fa; }
.stat-icon.gold   { color: #fbbf24; }
.stat-value {
  font-family: var(--font-display);
  font-size: 1.6rem; font-weight: 800;
  color: #fff; letter-spacing: 0.5px;
}

/* ==========  GAME WORKSPACE  ========== */
.game-workspace {
  display: flex; flex-direction: column; gap: 1.5rem;
  align-items: center;
}

/* Board Panel */
.board-panel {
  position: relative;
  padding: 1.5rem;
  width: 100%;
  display: flex; justify-content: center; align-items: center;
  background: rgba(2, 6, 23, 0.65);
  border: 1px solid rgba(59, 130, 246, 0.1);
  box-shadow: 0 0 35px rgba(59, 130, 246, 0.1);
}

/* Board Overlay */
.board-overlay {
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(4, 7, 20, 0.88);
  display: flex; align-items: center; justify-content: center;
  z-index: 15; text-align: center;
  backdrop-filter: blur(8px);
  border-radius: 20px;
  transition: opacity 0.4s ease;
}
.board-overlay.hidden { opacity: 0; pointer-events: none; }
.overlay-inner {
  display: flex; flex-direction: column;
  gap: 1.2rem; align-items: center;
}
.overlay-title {
  font-family: var(--font-display);
  font-size: 2.5rem; font-weight: 800;
  background: linear-gradient(135deg, #06b6d4 0%, #c084fc 100%);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  letter-spacing: -1px;
}
.overlay-subtitle { font-size: 0.95rem; color: var(--text-muted); }

/* ==========  3D CARD BOARD  ========== */
.board {
  display: grid;
  gap: 14px;
  width: 100%;
  max-width: 560px;
}
.board-4x3 { grid-template-columns: repeat(4, 1fr); }
.board-4x4 { grid-template-columns: repeat(4, 1fr); }
.board-6x4 { grid-template-columns: repeat(6, 1fr); }
.board-6x5 { grid-template-columns: repeat(6, 1fr); }

/* Individual Card */
.card {
  position: relative;
  width: 100%;
  padding-top: 100%; /* square aspect ratio */
  perspective: 800px;
  cursor: pointer;
}
.card-inner {
  position: absolute;
  top: 0; right: 0; bottom: 0; left: 0;
  transition: transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
  transform-style: preserve-3d;
}
.card.flipped .card-inner { transform: rotateY(180deg); }
.card.matched .card-inner { transform: rotateY(180deg); }

/* Card Faces */
.card-front, .card-back {
  position: absolute;
  top: 0; right: 0; bottom: 0; left: 0;
  border-radius: 14px;
  backface-visibility: hidden;
  display: flex; align-items: center; justify-content: center;
}
.card-front {
  background: linear-gradient(145deg, rgba(15, 23, 42, 0.8) 0%, rgba(30, 41, 59, 0.6) 100%);
  border: 1px solid rgba(255, 255, 255, 0.06);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.4), inset 0 1px 0 rgba(255,255,255,0.05);
  font-size: 1.6rem;
  color: rgba(255,255,255,0.12);
}
.card-front::before {
  content: '';
  position: absolute;
  top: -1px; left: -1px; right: -1px; bottom: -1px;
  border-radius: 14px;
  background: linear-gradient(135deg, rgba(59,130,246,0.15) 0%, transparent 50%, rgba(168,85,247,0.15) 100%);
  z-index: -1;
  opacity: 0;
  transition: opacity 0.3s;
}
.card:hover .card-front::before { opacity: 1; }
.card:hover .card-front {
  border-color: rgba(59, 130, 246, 0.2);
  box-shadow: 0 8px 25px rgba(59, 130, 246, 0.15);
}

.card-back {
  background: linear-gradient(145deg, rgba(6, 182, 212, 0.15) 0%, rgba(168, 85, 247, 0.12) 100%);
  border: 1px solid rgba(6, 182, 212, 0.2);
  transform: rotateY(180deg);
  font-size: 1.8rem;
  color: #fff;
  box-shadow: 0 6px 25px rgba(6, 182, 212, 0.2), inset 0 0 20px rgba(6, 182, 212, 0.05);
}

/* Matched glow */
.card.matched .card-back {
  border-color: rgba(16, 185, 129, 0.35);
  background: linear-gradient(145deg, rgba(16, 185, 129, 0.15) 0%, rgba(5, 150, 105, 0.1) 100%);
  box-shadow: 0 0 25px rgba(16, 185, 129, 0.25);
  animation: matchPulse 0.6s ease;
}
@keyframes matchPulse {
  0%   { transform: rotateY(180deg) scale(1); }
  50%  { transform: rotateY(180deg) scale(1.08); }
  100% { transform: rotateY(180deg) scale(1); }
}

/* Shake animation on mismatch */
.card.shake .card-inner {
  animation: shake 0.45s ease;
}
@keyframes shake {
  0%, 100% { transform: rotateY(180deg) translateX(0); }
  20%      { transform: rotateY(180deg) translateX(-6px); }
  40%      { transform: rotateY(180deg) translateX(6px); }
  60%      { transform: rotateY(180deg) translateX(-4px); }
  80%      { transform: rotateY(180deg) translateX(4px); }
}

/* ==========  BUTTONS  ========== */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  gap: 0.4rem; padding: 0.55rem 1.25rem;
  font-size: 0.85rem; font-weight: 700;
  border-radius: 8px; border: none;
  cursor: pointer; transition: var(--transition-smooth);
}
.btn-primary {
  background: linear-gradient(135deg, #06b6d4 0%, #a855f7 100%);
  color: #fff;
  box-shadow: 0 4px 12px rgba(6, 182, 212, 0.3);
}
.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 18px rgba(6, 182, 212, 0.45);
}
.btn-large { padding: 0.75rem 2rem; font-size: 1rem; border-radius: 10px; }

/* Difficulty buttons */
.difficulty-btns {
  display: flex; gap: 0.5rem; flex-wrap: wrap; margin-top: 0.4rem;
}
.btn-diff {
  padding: 0.4rem 0.8rem;
  border-radius: 8px;
  font-size: 0.75rem; font-weight: 600;
  border: 1px solid rgba(255,255,255,0.06);
  background: rgba(255,255,255,0.03);
  color: var(--text-muted);
  cursor: pointer;
  transition: var(--transition-smooth);
}
.btn-diff:hover {
  background: rgba(255,255,255,0.06);
  border-color: rgba(6, 182, 212, 0.3);
  color: var(--text-main);
}
.btn-diff.active {
  background: rgba(6, 182, 212, 0.15);
  border-color: #06b6d4;
  color: #22d3ee;
  box-shadow: 0 0 10px rgba(6, 182, 212, 0.2);
}

/* ==========  CONTROLS PANEL  ========== */
.controls-panel {
  width: 100%; padding: 1.5rem;
  display: flex; flex-direction: column; gap: 1.25rem;
}
.controls-header-row {
  display: flex; justify-content: space-between; align-items: center;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  padding-bottom: 0.75rem;
}
.controls-header-row h3 { font-size: 1.1rem; font-weight: 700; }
.controls-header-actions { display: flex; align-items: center; gap: 0.5rem; }
.controls-details-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}
.control-col { display: flex; flex-direction: column; gap: 0.5rem; }
.control-col h4 {
  font-size: 0.88rem; font-weight: 700; color: #22d3ee;
  display: flex; align-items: center; gap: 0.35rem;
}
.control-col p { font-size: 0.8rem; color: var(--text-muted); line-height: 1.5; }
.control-col ul { list-style: none; }
.control-col li { font-size: 0.8rem; color: var(--text-muted); margin-bottom: 0.35rem; }
.control-col li strong { color: #fff; }

/* ==========  EXPLANATION BOARD  ========== */
.explanation-board-section {
  display: flex; flex-direction: column; gap: 1.25rem; width: 100%;
}
.explanation-board-section .board-header {
  border-bottom: 2px solid #3b82f6;
  padding-bottom: 0.5rem;
  display: flex; align-items: center; gap: 0.75rem;
}
.explanation-board-section .board-header i { font-size: 1.25rem; color: #3b82f6; }
.explanation-board-section .board-header h2 { font-size: 1.1rem; font-weight: 700; }
.explanation-board-section .board-header span { font-size: 0.8rem; color: var(--text-muted); }

.explanation-layout {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 1.5rem; align-items: start;
}
.explanation-index-list {
  background: rgba(0, 0, 0, 0.15);
  border: 1px solid rgba(255,255,255,0.04);
  border-radius: 16px; overflow: hidden;
}
.explanation-index-list ul { list-style: none; display: flex; flex-direction: column; }
.explanation-index-list li {
  padding: 0.7rem 1rem; font-size: 0.8rem; font-weight: 600;
  color: var(--text-muted); cursor: pointer;
  border-bottom: 1px solid rgba(255,255,255,0.03);
  display: flex; align-items: center; gap: 0.75rem;
  transition: var(--transition-smooth);
}
.explanation-index-list li:last-child { border-bottom: none; }
.explanation-index-list li:hover {
  background: rgba(255, 255, 255, 0.02);
  color: var(--text-main); padding-left: 1.25rem;
}
.explanation-index-list li.active {
  background: rgba(59, 130, 246, 0.1);
  color: #fff; border-left: 4px solid #3b82f6; padding-left: 1.25rem;
}
.index-num {
  font-family: var(--font-display);
  font-size: 0.72rem; color: rgba(255,255,255,0.08); font-weight: 700;
}
.explanation-index-list li.active .index-num { color: #3b82f6; }

.explanation-display-box {
  min-height: 320px; padding: 2.2rem;
  display: flex; flex-direction: column;
  border-left: 4px solid #93c5fd;
  background: linear-gradient(135deg, rgba(30, 41, 59, 0.45) 0%, rgba(15, 23, 42, 0.6) 100%);
}
.display-content-inner {
  display: flex; flex-direction: column; gap: 1.25rem;
  opacity: 1; transition: opacity 0.3s ease-in-out;
}
.display-top-badge {
  display: flex; align-items: center; gap: 0.5rem;
  background: rgba(59, 130, 246, 0.12);
  padding: 0.25rem 0.8rem; border-radius: 30px; width: fit-content;
}
.display-top-badge i { font-size: 0.8rem; color: #60a5fa; }
.display-top-badge span { font-size: 0.72rem; font-weight: 700; color: #93c5fd; }
.explanation-display-box h3 { font-size: 1.45rem; font-weight: 800; color: #fff; letter-spacing: -0.5px; }
.display-text-body { font-size: 0.92rem; color: #e2e8f0; line-height: 1.7; }
.text-blue { color: #60a5fa; }

/* ==========  FLOATING NAV  ========== */
.floating-navigator {
  position: fixed; bottom: 2rem; right: 2rem; z-index: 1000;
}
.floating-buttons-col { display: flex; flex-direction: column; gap: 0.5rem; }
.btn-float {
  width: 40px; height: 40px; border-radius: 50%;
  border: 1px solid rgba(255,255,255,0.08);
  background: rgba(10, 16, 32, 0.8);
  backdrop-filter: blur(10px);
  color: var(--text-muted); cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  transition: var(--transition-smooth);
}
.btn-float:hover {
  background: rgba(59, 130, 246, 0.15);
  border-color: #3b82f6; color: #fff;
}

/* ==========  GAME COMPLETE OVERLAY  ========== */
.complete-overlay {
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(4, 7, 20, 0.92);
  display: flex; align-items: center; justify-content: center;
  z-index: 20; text-align: center;
  backdrop-filter: blur(12px);
  border-radius: 20px;
  animation: fadeInOverlay 0.4s ease;
}
@keyframes fadeInOverlay {
  from { opacity: 0; } to { opacity: 1; }
}
.complete-inner {
  display: flex; flex-direction: column;
  gap: 0.8rem; align-items: center;
}
.complete-inner .trophy-icon {
  font-size: 3rem;
  background: linear-gradient(135deg, #fbbf24 0%, #f59e0b 100%);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  animation: bounce 0.6s ease;
}
@keyframes bounce {
  0%, 100% { transform: translateY(0); }
  50%      { transform: translateY(-12px); }
}
.complete-inner h2 {
  font-family: var(--font-display);
  font-size: 1.8rem; font-weight: 800;
  background: linear-gradient(135deg, #fbbf24, #22d3ee);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
}
.complete-inner .result-line {
  font-size: 0.9rem; color: var(--text-muted);
}
.complete-inner .result-line strong { color: #fff; }

/* ==========  RESPONSIVE  ========== */
@media (max-width: 768px) {
  .main-header { margin: 0.5rem; border-radius: 16px; padding: 0.75rem 1rem; }
  .logo-text { display: none; }
  .header-nav { margin: 0 0.5rem; }
  .stat-dashboard-cards { grid-template-columns: repeat(2, 1fr); }
  .controls-details-grid { grid-template-columns: 1fr; }
  .explanation-layout { grid-template-columns: 1fr; }
  .board { max-width: 100%; gap: 8px; }
}
@media (max-width: 480px) {
  .memory-container { padding: 1rem 0.75rem 3rem; }
  .main-title { font-size: 1.6rem; }
  .board { gap: 6px; }
  .card-back { font-size: 1.2rem; }
}