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

body {
  height: 100vh;
  display: flex;
  background: #060AB2;
}

.memory-game {
  --cols: 4;
  --rows: 4;
  --flip-duration: 0.3s;
  --card-padding: 20px;
  width: 640px;
  height: 640px;
  margin: auto;
  display: flex;
  flex-wrap: wrap;
  perspective: 1000px;
}

.memory-card {
  width: calc(100% / var(--cols) - 10px);
  height: calc(100% / var(--rows) - 10px);
  margin: 5px;
  position: relative;
  transform: scale(1);
  transform-style: preserve-3d;
  transition: transform var(--flip-duration);
  box-shadow: 1px 1px 1px rgba(0,0,0,.3);
}

.memory-card:active {
  transform: scale(0.97);
  transition: transform .2s;
}

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

.front-face,
.back-face {
  width: 100%;
  height: auto;
  padding: var(--card-padding);
  position: absolute;
  border-radius: 5px;
  background: radial-gradient(#ffffff, #1C7CCC);
  backface-visibility: hidden;
}

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

.config-modal {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(6, 10, 178, 0.88);
  z-index: 100;
  justify-content: center;
  align-items: center;
}

.config-modal.open {
  display: flex;
}

.config-panel {
  background: #1C7CCC;
  border-radius: 12px;
  padding: 40px;
  text-align: center;
  color: white;
  position: relative;
}

.config-close {
  position: absolute;
  top: 10px;
  right: 12px;
  background: none;
  border: none;
  color: rgba(255,255,255,0.4);
  font-size: 1.1em;
  cursor: pointer;
  padding: 2px 6px;
  transition: color 0.15s;
}

.config-close:hover {
  color: white;
}

.version {
  font-size: 0.6em;
  color: rgba(255,255,255,0.6);
  font-family: 'Source Sans Pro', sans-serif;
  letter-spacing: 1px;
  margin-top: 4px;
}

.config-panel h2 {
  margin-bottom: 25px;
  font-family: 'Orbitron', sans-serif;
  font-size: 1.4em;
  letter-spacing: 2px;
}

.config-buttons {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  justify-content: center;
}

.config-buttons button {
  padding: 14px 22px;
  font-size: 1.1em;
  font-family: 'Orbitron', sans-serif;
  background: #060AB2;
  color: white;
  border: 2px solid rgba(255,255,255,0.4);
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.15s;
  min-width: 80px;
}

.config-buttons button:hover,
.config-buttons button.active {
  background: white;
  color: #060AB2;
  border-color: white;
}

.config-sliders {
  margin-top: 28px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  text-align: left;
  font-family: 'Source Sans Pro', sans-serif;
  font-size: 1em;
}

.config-sliders label {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.config-sliders input[type="range"] {
  width: 100%;
  accent-color: #060AB2;
  cursor: pointer;
}

/* Leaderboard */
.leaderboard {
  position: fixed;
  right: 16px;
  top: 0;
  width: 220px;
  background: rgba(0,0,0,0.45);
  border: 1px solid rgba(255,255,255,0.12);
  border-top: none;
  color: white;
  padding: 16px 16px 0;
  border-radius: 0 0 12px 12px;
  font-family: 'Source Sans Pro', sans-serif;
  z-index: 10;
  transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}
.leaderboard.lb-collapsed {
  transform: translateY(calc(-100% + 34px));
}
.lb-tab {
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  padding: 7px 4px;
  font-size: 0.78em;
  font-family: 'Orbitron', sans-serif;
  letter-spacing: 0.5px;
  user-select: none;
  border-top: 1px solid rgba(255,255,255,0.1);
  margin-top: 12px;
}
.lb-tab:hover { color: rgba(255,255,255,0.8); }
.lb-chevron {
  transition: transform 0.4s;
  font-size: 0.75em;
  opacity: 0.7;
}
.leaderboard.lb-collapsed .lb-chevron {
  transform: rotate(180deg);
}
.leaderboard h3 {
  font-family: 'Orbitron', sans-serif;
  font-size: 0.95em;
  margin-bottom: 12px;
  letter-spacing: 1px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.lb-size-tag {
  background: rgba(255,255,255,0.15);
  border-radius: 4px;
  padding: 1px 7px;
  font-size: 0.85em;
  letter-spacing: 0;
}
.lb-section {
  margin-bottom: 14px;
}
.lb-section-title {
  font-size: 0.72em;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: rgba(255,255,255,0.5);
  margin-bottom: 6px;
}
.lb-alltime {
  font-size: 0.92em;
  font-weight: 600;
  color: #ffd700;
  padding: 6px 8px;
  background: rgba(255,215,0,0.08);
  border-radius: 6px;
  border-left: 3px solid #ffd700;
}
.leaderboard ol {
  list-style: none;
  padding: 0;
  margin: 0;
}
.leaderboard li {
  font-size: 0.88em;
  margin: 4px 0;
}
.lb-loading {
  color: rgba(255,255,255,0.4);
  font-style: italic;
}
.lb-row {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 4px 6px;
  border-radius: 6px;
  background: rgba(255,255,255,0.04);
}
.lb-medal {
  font-size: 1.1em;
  width: 22px;
  text-align: center;
  flex-shrink: 0;
}
.lb-name {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.lb-time {
  font-family: 'Orbitron', sans-serif;
  font-size: 0.78em;
  color: rgba(255,255,255,0.7);
  white-space: nowrap;
}
.lb-footer {
  margin-top: 10px;
  display: flex;
  justify-content: center;
}
.lb-btn {
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.2);
  color: white;
  border-radius: 6px;
  padding: 5px 14px;
  font-size: 0.82em;
  cursor: pointer;
  transition: background 0.15s;
}
.lb-btn:hover {
  background: rgba(255,255,255,0.18);
}
.lb-status {
  margin-top: 8px;
  text-align: center;
  color: rgba(255,255,255,0.7);
  font-size: 0.8em;
  min-height: 1.2em;
}

/* Name modal */
.name-modal {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(6,10,178,0.88);
  z-index: 200;
  justify-content: center;
  align-items: center;
}
.name-modal.open {
  display: flex;
}
.name-panel {
  background: linear-gradient(135deg, #1C7CCC, #0e4f8a);
  border: 1px solid rgba(255,255,255,0.2);
  border-radius: 16px;
  padding: 36px 40px 32px;
  text-align: center;
  color: white;
  width: 320px;
  max-width: 90vw;
  box-shadow: 0 8px 32px rgba(0,0,0,0.4);
}
.name-trophy {
  font-size: 3em;
  margin-bottom: 8px;
}
.name-panel h2 {
  font-family: 'Orbitron', sans-serif;
  font-size: 1.3em;
  letter-spacing: 2px;
  margin-bottom: 8px;
}
.name-subtitle {
  font-family: 'Source Sans Pro', sans-serif;
  font-size: 0.92em;
  color: rgba(255,255,255,0.75);
  margin-bottom: 20px;
}
.name-input {
  width: 100%;
  padding: 10px 14px;
  font-size: 1em;
  font-family: 'Source Sans Pro', sans-serif;
  border-radius: 8px;
  border: 2px solid rgba(255,255,255,0.3);
  background: rgba(255,255,255,0.1);
  color: white;
  outline: none;
  transition: border-color 0.15s;
  margin-bottom: 20px;
}
.name-input::placeholder { color: rgba(255,255,255,0.4); }
.name-input:focus { border-color: rgba(255,255,255,0.7); }
.name-buttons {
  display: flex;
  gap: 12px;
  justify-content: center;
}
.name-btn-skip {
  padding: 10px 22px;
  font-size: 0.95em;
  font-family: 'Source Sans Pro', sans-serif;
  background: transparent;
  color: rgba(255,255,255,0.6);
  border: 1px solid rgba(255,255,255,0.25);
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.15s;
}
.name-btn-skip:hover { color: white; border-color: rgba(255,255,255,0.6); }
.name-btn-ok {
  padding: 10px 28px;
  font-size: 0.95em;
  font-family: 'Orbitron', sans-serif;
  background: #060AB2;
  color: white;
  border: 2px solid rgba(255,255,255,0.4);
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.15s;
}
.name-btn-ok:hover { background: white; color: #060AB2; border-color: white; }