* {
  box-sizing: border-box;
  -webkit-tap-highlight-color: transparent;
}

:root {
  --lo-blue: #4C6FFF;
  --lo-yellow: #FFDD55;
  --lo-bg-top: #6DE0FF;
  --lo-bg-bottom: #4C6FFF;
  --lo-blue-start: #6DE0FF;
  --lo-blue-end: #4C6FFF;
  --lo-yellow-dark: #d4b300;
  --lo-blue-dark: #3d5ae0;
  --safe-top: env(safe-area-inset-top, 0px);
  --safe-right: env(safe-area-inset-right, 0px);
  --safe-bottom: env(safe-area-inset-bottom, 0px);
  --safe-left: env(safe-area-inset-left, 0px);
}

html, body {
  margin: 0;
  padding: 0;
  min-height: 100vh;
  font-family: "Fredoka", sans-serif;
  background: linear-gradient(180deg, var(--lo-bg-top) 0%, var(--lo-bg-bottom) 100%);
  color: #1a1a2e;
  text-transform: uppercase;
}

body {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 12px 16px 24px;
}

.puzzle-header {
  margin-bottom: 8px;
  text-align: center;
  width: 100%;
  max-width: 520px;
  margin-left: auto;
  margin-right: auto;
}

.puzzle-header-img {
  width: 100%;
  max-width: 100%;
  height: auto;
  display: block;
  margin: 0 auto;
}

.subtitle {
  font-size: 14px;
  font-weight: 600;
  margin: 0 0 12px 0;
  text-align: center;
  color: rgba(26, 26, 46, 0.9);
}

.difficulty-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  margin-bottom: 10px;
}

.difficulty-row label {
  font-weight: 600;
  font-size: 14px;
}

#difficulty-select {
  padding: 8px 12px;
  border-radius: 12px;
  border: 2px solid var(--lo-blue);
  font-family: "Fredoka", sans-serif;
  font-weight: 600;
  font-size: 14px;
  background: #fff;
  color: #1a1a2e;
}

.game-info {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 10px;
  margin-bottom: 12px;
}

.game-info-pill {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 16px;
  min-height: 48px;
  line-height: 1.2;
  border-radius: 16px;
  font-size: 18px;
  font-weight: 700;
  background: var(--lo-yellow);
  color: #1a1a2e;
  box-shadow: 0 4px 0 rgba(0, 0, 0, 0.2);
}

@media (max-width: 480px) {
  .game-info-pill {
    font-size: 16px;
    padding: 8px 12px;
  }
}

.puzzle-wrap {
  width: 100%;
  max-width: 520px;
  margin: 0 auto 16px;
}

.puzzle-board-wrap {
  width: 100%;
  border-radius: 20px;
  overflow: hidden;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
  background: var(--lo-bg-top);
}

#puzzle-canvas {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  /* Size set in JS for HiDPI; prevent stretch that would blur tiles */
  aspect-ratio: 1 / 1;
}

.buttons-section {
  width: 100%;
  max-width: 520px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.button-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.button-row button,
.button-row-single .btn-leaderboard-full,
.btn-back-link {
  padding: 14px 18px;
  border-radius: 16px;
  border: none;
  font-family: "Fredoka", sans-serif;
  font-size: 15px;
  font-weight: 700;
  cursor: pointer;
  text-transform: uppercase;
  letter-spacing: 0.02em;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.button-row button {
  background: linear-gradient(180deg, #FFE986 0%, var(--lo-yellow) 90%);
  color: #1a1a2e;
  box-shadow: 0 4px 0 var(--lo-yellow-dark), 0 6px 20px rgba(255, 221, 85, 0.35);
}

.button-row button:hover,
.button-row-single .btn-leaderboard-full:hover {
  transform: translateY(-2px);
  box-shadow: 0 5px 0 var(--lo-yellow-dark), 0 8px 24px rgba(255, 221, 85, 0.5);
}

.button-row-single {
  width: 100%;
}

.button-row-single .btn-leaderboard-full {
  width: 100%;
  background: linear-gradient(180deg, #FFE986 0%, var(--lo-yellow) 90%);
  color: #1a1a2e;
  box-shadow: 0 4px 0 rgba(0, 0, 0, 0.25);
}

.button-row-nav {
  margin-top: 4px;
}

.btn-back-link {
  display: inline-block;
  text-align: center;
  text-decoration: none;
  background: rgba(0, 0, 0, 0.2);
  color: #fff;
  width: 100%;
}

.btn-back-link:hover {
  background: rgba(0, 0, 0, 0.35);
}

/* Leaderboard – match One Button Hero identically */
.leaderboard-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 160;
  padding: max(20px, var(--safe-top)) max(20px, var(--safe-right)) max(20px, var(--safe-bottom)) max(20px, var(--safe-left));
  box-sizing: border-box;
}
.leaderboard-overlay.hidden {
  display: none;
}

.leaderboard-card {
  position: relative;
  font-family: "Fredoka", sans-serif;
  background: linear-gradient(180deg, var(--lo-blue-start) 0%, var(--lo-blue-end) 100%);
  border-radius: 20px;
  padding: 24px;
  max-width: 400px;
  width: 100%;
  max-height: 85vh;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  box-shadow: 0 20px 50px rgba(76, 111, 255, 0.4), 0 0 0 2px rgba(255, 255, 255, 0.15);
  animation: lo-scale-in 0.35s cubic-bezier(0.34, 1.56, 0.64, 1);
}
.leaderboard-rules-btn {
  position: absolute;
  top: 12px;
  right: 12px;
  font-family: "Fredoka", sans-serif;
  font-size: 12px;
  font-weight: 700;
  color: #1a1a2e;
  background: var(--lo-yellow);
  border: none;
  border-radius: 12px;
  padding: 6px 12px;
  cursor: pointer;
  box-shadow: 0 3px 0 var(--lo-yellow-dark), 0 4px 12px rgba(255, 221, 85, 0.35);
  transition: transform 0.15s ease, box-shadow 0.2s ease;
}
.leaderboard-logo {
  width: 100%;
  max-width: 200px;
  height: auto;
  margin: 0 auto 8px auto;
  display: block;
}
.leaderboard-title {
  font-family: "Fredoka", sans-serif;
  font-size: 22px;
  font-weight: 600;
  margin: 0 0 16px 0;
  color: #1a1a2e;
  text-align: center;
  letter-spacing: 0.02em;
}

.leaderboard-tabs {
  display: flex;
  gap: 8px;
  margin-bottom: 16px;
}
.leaderboard-tabs button {
  flex: 1;
  padding: 10px;
  border-radius: 12px;
  border: 2px solid rgba(255, 255, 255, 0.4);
  background: rgba(255, 255, 255, 0.25);
  font-family: "Fredoka", sans-serif;
  font-weight: 700;
  font-size: 14px;
  text-transform: uppercase;
  cursor: pointer;
  color: #1a1a2e;
}
.leaderboard-tabs button:hover {
  background: rgba(255, 255, 255, 0.35);
}

.leaderboard-list-popup {
  overflow-y: auto;
  flex: 1 1 auto;
  min-height: 140px;
  margin-bottom: 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.leaderboard-popup-row {
  font-family: "Fredoka", sans-serif;
  display: grid;
  grid-template-columns: 46px 1fr 82px;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  border-radius: 12px;
  font-size: 15px;
  font-weight: 600;
  background: rgba(255, 255, 255, 0.28);
  color: #1a1a2e;
  opacity: 0;
  animation: lo-row-fade-in 0.4s ease forwards;
  border: 1px solid rgba(255, 255, 255, 0.2);
}
.leaderboard-popup-row.rank-gold {
  background: linear-gradient(90deg, rgba(255, 215, 0, 0.45), rgba(255, 255, 255, 0.35));
  border-color: rgba(255, 215, 0, 0.5);
}
.leaderboard-popup-row.rank-silver {
  background: linear-gradient(90deg, rgba(192, 192, 192, 0.4), rgba(255, 255, 255, 0.3));
  border-color: rgba(192, 192, 192, 0.45);
}
.leaderboard-popup-row.rank-bronze {
  background: linear-gradient(90deg, rgba(205, 127, 50, 0.4), rgba(255, 255, 255, 0.3));
  border-color: rgba(205, 127, 50, 0.45);
}
.leaderboard-popup-rank { font-size: 1.05em; min-width: 36px; }
.leaderboard-popup-name {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  letter-spacing: 0.02em;
}
.leaderboard-popup-score {
  font-variant-numeric: tabular-nums;
  text-align: right;
  display: block;
  line-height: 1.35;
}
.leaderboard-popup-moves {
  white-space: nowrap;
}
.leaderboard-sec-unit {
  text-transform: lowercase;
}

@keyframes lo-scale-in {
  from { opacity: 0; transform: scale(0.9); }
  to { opacity: 1; transform: scale(1); }
}
@keyframes lo-row-fade-in {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 1; transform: translateY(0); }
}

.leaderboard-unavailable {
  padding: 16px;
  text-align: center;
  color: #1a1a2e;
  font-size: 14px;
  font-weight: 600;
  opacity: 0.9;
}

/* Submit section – match OBH */
.leaderboard-submit-section {
  margin-top: 16px;
  padding-top: 16px;
  border-top: 2px solid rgba(255, 255, 255, 0.3);
}
.leaderboard-submit-section.hidden {
  display: none !important;
}
.leaderboard-submit-heading {
  font-size: 18px;
  font-weight: 800;
  color: #1a1a2e;
  margin: 0 0 4px 0;
}
.leaderboard-your-score {
  font-size: 17px;
  font-weight: 700;
  color: #1a1a2e;
  margin: 0 0 6px 0;
}
.leaderboard-submit-section input {
  width: 100%;
  padding: 12px 14px;
  font-size: 16px;
  border: 2px solid rgba(26, 26, 46, 0.35);
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.3);
  color: #1a1a2e;
  margin-bottom: 12px;
  box-sizing: border-box;
}
.leaderboard-submit-section input:focus {
  outline: none;
  border-color: var(--lo-yellow);
  box-shadow: 0 0 0 3px rgba(255, 221, 85, 0.3);
}
.leaderboard-submit-actions {
  display: flex;
  gap: 10px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 8px;
}
.leaderboard-submit-msg {
  font-size: 14px;
  min-height: 20px;
  margin: 0;
  color: #1a1a2e;
  font-weight: 600;
}

.btn-lo-yellow {
  font-family: "Fredoka", sans-serif;
  background: var(--lo-yellow);
  color: #1a1a2e;
  border: none;
  padding: 14px 28px;
  font-size: 16px;
  font-weight: 700;
  border-radius: 20px;
  cursor: pointer;
  box-shadow: 0 4px 0 var(--lo-yellow-dark), 0 6px 20px rgba(255, 221, 85, 0.4);
  transition: transform 0.15s ease, box-shadow 0.2s ease;
  display: block;
  width: 100%;
  text-align: center;
}
.btn-lo-yellow:hover {
  transform: translateY(-1px);
  box-shadow: 0 5px 0 var(--lo-yellow-dark), 0 8px 24px rgba(255, 221, 85, 0.5);
}
.btn-lo-secondary {
  font-family: "Fredoka", sans-serif;
  background: var(--lo-yellow);
  color: #1a1a2e;
  border: none;
  padding: 12px 24px;
  font-size: 15px;
  font-weight: 700;
  border-radius: 20px;
  cursor: pointer;
  box-shadow: 0 4px 0 var(--lo-yellow-dark), 0 6px 20px rgba(255, 221, 85, 0.4);
  transition: transform 0.15s ease, box-shadow 0.2s ease;
}
.btn-lo-secondary:hover {
  transform: translateY(-1px);
  box-shadow: 0 5px 0 var(--lo-yellow-dark), 0 8px 24px rgba(255, 221, 85, 0.5);
}

@media (max-width: 480px) {
  .leaderboard-card {
    padding: 20px;
    border-radius: 20px;
  }
}