@property --brand {
  syntax: '<color>';
  inherits: true;
  initial-value: #d946ef;
}

@property --brand-hover {
  syntax: '<color>';
  inherits: true;
  initial-value: #f472b6;
}

@property --brand-soft {
  syntax: '<color>';
  inherits: true;
  initial-value: rgba(217, 70, 239, 0.15);
}

:root {
  --bg: #000000;
  --bg-subtle: #1c1c1e;
  --border: rgba(255, 255, 255, 0.10);
  --text-1: #f2f2f7;
  --text-2: rgba(235, 235, 245, 0.75);
  --text-3: rgba(235, 235, 245, 0.50);
  --text-4: rgba(235, 235, 245, 0.25);
  --brand: #d946ef;
  --brand-hover: #f472b6;
  --brand-soft: rgba(217, 70, 239, 0.15);
  --glass-bg: rgba(28, 28, 30, 0.72);
  --glass-border: rgba(255, 255, 255, 0.10);
  --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.5), 0 1px 2px rgba(0, 0, 0, 0.3);
}

html {
  font-family: 'Inter', system-ui, sans-serif;
  -webkit-font-smoothing: antialiased;
  scroll-behavior: smooth;
}

body {
  background-color: var(--bg);
  color: var(--text-1);
  margin: 0;
  min-height: 100vh;
  line-height: 1.7;
}

body::before {
  content: '';
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background:
    radial-gradient(ellipse 80% 55% at 15% 0%, rgba(217, 70, 239, 0.22) 0%, transparent 55%),
    radial-gradient(ellipse 55% 45% at 85% 90%, rgba(139, 92, 246, 0.18) 0%, transparent 55%),
    radial-gradient(ellipse 45% 35% at 55% 45%, rgba(217, 70, 239, 0.08) 0%, transparent 60%);
}

body > * { position: relative; z-index: 1; }

.layout-wrapper {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ─── Header ─── */
header {
  background: rgba(0, 0, 0, 0.55);
  backdrop-filter: blur(28px) saturate(200%);
  -webkit-backdrop-filter: blur(28px) saturate(200%);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.nav-link {
  position: relative;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-2);
  transition: color 0.15s;
  padding-bottom: 2px;
  text-decoration: none;
}
.nav-link:hover { color: var(--text-1); }
.nav-link::after {
  content: '';
  position: absolute;
  bottom: -2px; left: 0;
  width: 0; height: 2px;
  background: var(--brand);
  transition: width 0.25s ease;
  border-radius: 2px;
}
.nav-link:hover::after { width: 100%; }

.nav-dropdown {
  position: relative;
}

.nav-dropdown-btn {
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
  font-family: inherit;
}

.nav-dropdown-btn::after {
  content: '';
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  height: 16px;
}

.nav-dropdown-menu {
  display: none;
  position: absolute;
  top: calc(100% + 12px);
  left: 50%;
  transform: translateX(-50%);
  background: rgba(28, 28, 30, 0.95);
  backdrop-filter: blur(20px);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 0.4rem;
  min-width: 140px;
  box-shadow: var(--shadow-card);
}

.nav-dropdown:hover .nav-dropdown-menu {
  display: flex;
  flex-direction: column;
}

.nav-dropdown-menu a {
  padding: 0.5rem 0.85rem;
  border-radius: 8px;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-2);
  text-decoration: none;
  transition: background 0.15s, color 0.15s;
}

.nav-dropdown-menu a:hover {
  background: var(--brand-soft);
  color: var(--brand);
}

/* ─── Panel ─── */
.glass-panel {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: 24px;
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  box-shadow: var(--shadow-card);
}

/* ─── Buttons ─── */
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.6rem 1.25rem;
  background-color: var(--brand);
  color: #fff;
  font-size: 0.875rem;
  font-weight: 600;
  border-radius: 9999px;
  transition: all 0.2s;
  border: none;
  cursor: pointer;
  box-shadow: 0 4px 15px rgba(217, 70, 239, 0.35);
}
.btn-primary:hover {
  background-color: var(--brand-hover);
  transform: translateY(-1px);
  box-shadow: 0 6px 24px rgba(217, 70, 239, 0.50);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.6rem 1.25rem;
  background-color: transparent;
  color: var(--text-1);
  font-size: 0.875rem;
  font-weight: 500;
  border-radius: 9999px;
  border: 1px solid var(--border);
  transition: all 0.2s;
  cursor: pointer;
}
.btn-secondary:hover {
  border-color: var(--brand);
  background-color: var(--brand-soft);
  color: var(--brand);
}

.page-title {
  font-family: 'Nunito', 'Inter', sans-serif;
  font-size: 2rem;
  font-weight: 900;
  margin: 0;
  background: linear-gradient(135deg, #f9fafb 0%, #f472b6 50%, #d946ef 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ─── Score bar ─── */
.score-bar { border-radius: 16px; }
.score-num {
  font-family: 'Nunito', sans-serif;
  font-size: 1.5rem;
  font-weight: 900;
  color: var(--text-1);
  line-height: 1;
}

/* ─── Card 3D Flip ─── */
.card-item {
  perspective: 800px;
  cursor: pointer;
}

.card-inner {
  position: relative;
  width: 100%;
  height: 100%;
  text-align: center;
  transition: transform 0.45s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  transform-style: preserve-3d;
}

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

.card-front, .card-back {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid rgba(255, 255, 255, 0.18);
  font-size: clamp(1.5rem, 6vw, 2.75rem);
}

.card-front {
  background: rgba(255, 255, 255, 0.04);
  color: var(--brand);
  box-shadow: inset 0 0 10px rgba(217, 70, 239, 0.05);
}

.card-item:hover:not(.flipped) .card-front {
  background: rgba(255, 255, 255, 0.08);
  border-color: var(--brand);
  box-shadow: 0 0 12px var(--brand-soft);
}

.card-back {
  background: rgba(217, 70, 239, 0.12);
  transform: rotateY(180deg);
  border-color: rgba(217, 70, 239, 0.35);
}

.card-item.matched .card-back {
  border-color: #22c55e !important;
  background: rgba(34, 197, 94, 0.15) !important;
  box-shadow: 0 0 15px rgba(34, 197, 94, 0.25);
  animation: matchPulse 0.4s ease-out;
}

@keyframes matchPulse {
  0% { transform: scale(1) rotateY(180deg); }
  50% { transform: scale(1.08) rotateY(180deg); }
  100% { transform: scale(1) rotateY(180deg); }
}

/* ─── Win Overlay ─── */
.win-overlay {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  background: rgba(0, 0, 0, 0.65);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  animation: fade-in 0.25s ease;
}
.win-overlay.hidden { display: none; }

@keyframes fade-in {
  from { opacity: 0; }
  to { opacity: 1; }
}

.win-card {
  width: 100%;
  max-width: 360px;
  text-align: center;
  padding: 2.5rem 2rem;
  animation: slide-up 0.3s ease;
}

@keyframes slide-up {
  from { transform: translateY(24px); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}

.win-emoji {
  font-size: 4rem;
  line-height: 1;
  margin-bottom: 0.75rem;
  animation: bounce 0.5s ease 0.1s both;
}

@keyframes bounce {
  0% { transform: scale(0); }
  60% { transform: scale(1.2); }
  100% { transform: scale(1); }
}

.win-title {
  font-family: 'Nunito', sans-serif;
  font-size: 2.25rem;
  font-weight: 900;
  margin: 0 0 0.25rem;
  background: linear-gradient(135deg, #f9fafb, #f472b6);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.win-sub {
  color: var(--text-3);
  font-size: 0.95rem;
  margin: 0;
}