:root {
  --color-brand: #6a5acd;
  --color-brand-dark: #534ab7;
  --color-bg: #f4f6f9;
  --color-card: #ffffff;
  --color-text-main: #181c32;
  --color-text-muted: #a1a5b7;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: var(--font-sans, system-ui, sans-serif);
  -webkit-tap-highlight-color: transparent;
}

body {
  background: #1e1e2d;
  color: var(--color-text-main);
  display: flex;
  justify-content: flex-start;
  align-items: flex-start;
  min-height: 100vh;
  margin: 0;
}

body>div:first-child {
  width: 100%;
  max-width: 450px;
  background: var(--color-bg) !important;
  position: relative !important;
  box-shadow: 0 0 60px rgba(0, 0, 0, 0.5);
  min-height: 100vh !important;
  overflow-x: hidden;
  padding-bottom: 90px;
  flex-shrink: 0;
  z-index: 10;
}

/* Right Panel for Desktop */
.right-panel {
  position: fixed;
  top: 0;
  right: 0;
  width: calc(100% - 450px);
  height: 100vh;
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: 40px;
  background: radial-gradient(circle at center, #162447 0%, #0d101d 100%);
  overflow: hidden;
  z-index: 5;
}

.right-panel::before,
.right-panel::after {
  content: '';
  position: absolute;
  width: 500px;
  height: 500px;
  border-radius: 50%;
  filter: blur(100px);
  z-index: 0;
  opacity: 0.12;
  animation: bgFloat 15s infinite alternate ease-in-out;
}

.right-panel::before {
  background: #7239ea;
  top: -150px;
  right: -150px;
}

.right-panel::after {
  background: #50cd89;
  bottom: -150px;
  left: -150px;
  animation-delay: -7s;
}

@keyframes bgFloat {
  0% {
    transform: translate(0, 0) scale(1) rotate(0deg);
  }

  100% {
    transform: translate(60px, 80px) scale(1.2) rotate(20deg);
  }
}

@keyframes posterFloat {

  0%,
  100% {
    transform: translateY(0);
  }

  50% {
    transform: translateY(-20px);
  }
}

@media (min-width: 992px) {
  .right-panel {
    display: flex;
  }
}

.hero-tagline {
  font-size: 32px;
  font-weight: 900;
  color: #fff;
  margin-top: 20px;
  margin-bottom: 12px;
  max-width: 600px;
  line-height: 1.2;
}

.hero-tagline-sub {
  font-size: 18px;
  color: #a1a5b7;
  font-weight: 600;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(12px)
  }

  to {
    opacity: 1;
    transform: translateY(0)
  }
}

@keyframes shake {

  0%,
  100% {
    transform: translateX(0)
  }

  20% {
    transform: translateX(-6px)
  }

  40% {
    transform: translateX(6px)
  }

  60% {
    transform: translateX(-4px)
  }

  80% {
    transform: translateX(4px)
  }
}

@keyframes pop {
  0% {
    transform: scale(0.8);
    opacity: 0
  }

  60% {
    transform: scale(1.15)
  }

  100% {
    transform: scale(1);
    opacity: 1
  }
}

@keyframes coinRain {
  0% {
    transform: translateY(0) rotate(0deg);
    opacity: 1
  }

  100% {
    transform: translateY(-70px) rotate(360deg);
    opacity: 0
  }
}

@keyframes progressPulse {

  0%,
  100% {
    opacity: 1
  }

  50% {
    opacity: 0.7
  }
}

.screen {
  display: none;
  animation: fadeIn 0.3s ease
}

.screen.active {
  display: block
}

/* Header */
.coin-bar {
  background: rgba(244, 246, 249, 0.85);
  backdrop-filter: blur(12px);
  padding: 16px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 50;
}

.brand {
  font-size: 20px;
  font-weight: 800;
  color: var(--color-text-main);
  letter-spacing: -0.5px;
}

.xp-bar-wrap {
  flex: 1;
  max-width: 130px;
  margin: 0 14px;
}

.xp-label {
  font-size: 10px;
  font-weight: 700;
  color: var(--color-text-muted);
  margin-bottom: 4px;
  display: flex;
  justify-content: space-between;
}

.xp-bar {
  height: 6px;
  background: #e4e6ef;
  border-radius: 4px;
  overflow: hidden;
}

.xp-fill {
  height: 100%;
  background: var(--color-brand);
  border-radius: 4px;
  transition: width 0.5s ease;
}

.coin-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: linear-gradient(295deg, #114d89, #e94f12);
  border-radius: 20px;
  padding: 8px 10px;
  font-size: 12px;
  font-weight: 800;
  color: #fff;
  cursor: pointer;
  box-shadow: 0 4px 12px rgba(233, 79, 18, 0.3);
  transition: transform 0.15s;
}

.coin-chip:hover {
  transform: scale(1.05);
}

.coin-dot {
  width: 18px;
  height: 18px;
  background: url('img/dollar.png') center/contain no-repeat;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: transparent;
  flex-shrink: 0;
}

/* Bottom Nav */
.nav-tabs {
  position: fixed;
  bottom: 0;
  left: 0;
  transform: none;
  width: 100%;
  max-width: 450px;
  background: var(--color-card);
  display: flex;
  justify-content: space-around;
  padding: 12px 10px 24px;
  box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.06);
  z-index: 90;
  border-radius: 24px 24px 0 0;
}

.nav-tab {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  font-size: 10px;
  font-weight: 700;
  color: var(--color-text-muted);
  text-align: center;
  line-height: 1.2;
  cursor: pointer;
  padding: 8px 4px;
  border-radius: 16px;
  transition: all 0.2s;
  flex: 1;
}

.nav-tab.active {
  color: var(--color-brand);
  background: rgba(106, 90, 205, 0.08);
}

.nav-tab::before {
  font-size: 20px;
  margin-bottom: 4px;
}

#tab-home::before {
  content: '🏠';
}

#tab-leaderboard::before {
  content: '🏆';
}

#tab-achievements::before {
  content: '🎖️';
}

#tab-daily::before {
  content: '🎁';
}

#tab-puzzle::before {
  content: '🧩';
}

/* Slider Hero */
.hero-slider {
  display: flex;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  padding: 10px 20px 20px;
  gap: 16px;
  scrollbar-width: none;
}

.hero-slider::-webkit-scrollbar {
  display: none;
}

.slider-card {
  min-width: 88%;
  border-radius: 24px;
  padding: 24px;
  scroll-snap-align: center;
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.08);
  position: relative;
  overflow: hidden;
}

.slide-1 {
  background: linear-gradient(135deg, #182848, #4b6cb7);
  color: #fff;
}

.slide-2 {
  background: linear-gradient(135deg, #ff9966, #ff5e62);
  color: #fff;
}

.slide-title {
  font-size: 22px;
  font-weight: 800;
  margin-bottom: 6px;
}

.slide-sub {
  font-size: 14px;
  opacity: 0.9;
  margin-bottom: 16px;
  line-height: 1.4;
}

.play-btn {
  background: #fff;
  color: #182848;
  font-weight: 800;
  padding: 10px 20px;
  border-radius: 20px;
  font-size: 13px;
  display: inline-block;
  cursor: pointer;
}

.streak-strip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(255, 255, 255, 0.25);
  backdrop-filter: blur(8px);
  border-radius: 20px;
  padding: 8px 16px;
  font-size: 13px;
  font-weight: 700;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
}

/* Stats Row */
.stats-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  padding: 0 20px 24px;
}

.stat-box {
  background: var(--color-card);
  border-radius: 18px;
  padding: 16px 10px;
  text-align: center;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.03);
  cursor: pointer;
  transition: transform 0.15s;
}

.stat-box:active {
  transform: scale(0.95);
}

.stat-val {
  font-size: 20px;
  font-weight: 800;
  color: var(--color-text-main);
}

.stat-lbl {
  font-size: 11px;
  font-weight: 700;
  color: var(--color-text-muted);
  margin-top: 4px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* Sections */
.section-title {
  font-size: 18px;
  font-weight: 800;
  color: var(--color-text-main);
  padding: 0 20px;
  margin-bottom: 14px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.section-link {
  font-size: 13px;
  color: var(--color-brand);
  font-weight: 700;
  cursor: pointer;
}

/* Cat Grid */
.cat-grid {
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: 0 20px 24px;
}

.cat-card {
  background: var(--color-card);
  border-radius: 20px;
  padding: 16px;
  display: flex;
  align-items: center;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.04);
  cursor: pointer;
  transition: transform 0.2s ease;
  border: 1px solid rgba(0, 0, 0, 0.02);
}

.cat-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.06);
}

.cat-icon {
  width: 52px;
  height: 52px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 26px;
  margin-right: 16px;
  flex-shrink: 0;
}

.cat-info {
  flex: 1;
}

.cat-name {
  font-size: 16px;
  font-weight: 800;
  color: var(--color-text-main);
  margin-bottom: 6px;
}

.cat-meta {
  display: flex;
  align-items: center;
  gap: 10px;
}

.cat-fee {
  display: inline-flex;
  align-items: center;
  gap: 1px;
  font-size: 13px;
  font-weight: 700;
  color: #F5A623;
}

.cat-badge {
  font-size: 10px;
  padding: 4px 10px;
  border-radius: 8px;
  font-weight: 800;
  text-transform: uppercase;
}


/* Recent Strip */
.recent-strip {
  padding: 0 20px 24px;
}

.recent-item {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px 16px;
  background: var(--color-card);
  border-radius: 16px;
  margin-bottom: 10px;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.03);
}

.recent-icon {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  flex-shrink: 0;
}

.recent-name {
  flex: 1;
  font-weight: 800;
  font-size: 15px;
}

.recent-score {
  color: var(--color-text-muted);
  font-size: 13px;
  font-weight: 600;
  margin-top: 2px;
}

/* Modal */
.modal-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.6);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  z-index: 100;
  backdrop-filter: blur(4px);
}

.modal {
  background: var(--color-card);
  border-radius: 28px;
  padding: 30px 24px;
  width: 100%;
  animation: pop 0.25s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  box-shadow: 0 15px 40px rgba(0, 0, 0, 0.2);
}

.modal-icon {
  font-size: 48px;
  text-align: center;
  margin-bottom: 16px;
}

.modal-title {
  font-size: 22px;
  font-weight: 800;
  text-align: center;
  margin-bottom: 8px;
  color: var(--color-text-main);
}

.modal-sub {
  font-size: 14px;
  color: var(--color-text-muted);
  text-align: center;
  margin-bottom: 24px;
  line-height: 1.5;
  font-weight: 500;
}

.btn {
  padding: 14px 24px;
  border-radius: 16px;
  cursor: pointer;
  font-size: 15px;
  font-weight: 800;
  border: none;
  background: #f4f6f9;
  color: var(--color-text-main);
  transition: transform 0.1s;
}

.btn:active {
  transform: scale(0.96);
}

.btn-primary {
  background: var(--color-brand);
  color: #fff;
  box-shadow: 0 6px 16px rgba(106, 90, 205, 0.3);
}

.btn-row {
  display: flex;
  gap: 12px;
  justify-content: center;
  margin-top: 24px;
}

.btn-row .btn {
  flex: 1;
  text-align: center;
}

.fee-confirm {
  background: #fffcf8;
  border: 2px dashed #ffecce;
  border-radius: 20px;
  padding: 18px;
  text-align: center;
  margin-bottom: 20px;
}

.fee-confirm-label {
  font-size: 13px;
  color: #a47e45;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.fee-confirm-val {
  font-size: 28px;
  font-weight: 800;
  color: #F5A623;
  margin-top: 6px;
}

/* Quiz Styles */
.warmup-area {
  padding: 0;
}

.warmup-q {
  font-size: 18px;
  font-weight: 800;
  margin-bottom: 20px;
  line-height: 1.5;
  color: var(--color-text-main);
}

.warmup-progress {
  display: flex;
  gap: 6px;
  margin-bottom: 24px;
}

.warmup-dot {
  flex: 1;
  height: 6px;
  border-radius: 3px;
  background: #e4e6ef;
  transition: background 0.3s;
}

.warmup-dot.done {
  background: var(--color-brand);
}

.warmup-feedback {
  padding: 14px;
  border-radius: 12px;
  font-size: 14px;
  font-weight: 700;
  margin-bottom: 16px;
  display: none;
  text-align: center;
}

.feedback-correct {
  background: #e8fff3;
  color: #186b40;
}

.feedback-wrong {
  background: #ffe5e5;
  color: #851e35;
}

.quiz-header {
  background: var(--color-card);
  padding: 18px 20px;
  display: flex;
  align-items: center;
  gap: 16px;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.02);
}

.q-counter {
  font-size: 15px;
  color: var(--color-text-muted);
  font-weight: 800;
}

.q-progress {
  flex: 1;
  height: 8px;
  background: #e4e6ef;
  border-radius: 4px;
}

.q-progress-fill {
  height: 100%;
  background: var(--color-brand);
  border-radius: 4px;
  transition: width 0.4s ease;
}

.timer-chip {
  display: flex;
  align-items: center;
  gap: 8px;
  background: #f4f6f9;
  border-radius: 16px;
  padding: 8px 14px;
  font-size: 15px;
  font-weight: 800;
  color: var(--color-text-main);
}

.timer-icon {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: #50cd89;
}

.timer-warn .timer-icon {
  background: #f1416c;
  animation: progressPulse 0.5s infinite;
}

.quiz-body {
  padding: 30px 20px;
}

.q-category-label {
  font-size: 13px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-brand);
  margin-bottom: 12px;
}

.q-text {
  font-size: 22px;
  font-weight: 800;
  margin-bottom: 30px;
  line-height: 1.4;
  color: var(--color-text-main);
}

.options-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
}

.option {
  padding: 12px 10px;
  min-height: 60px;
  border-radius: 18px;
  cursor: pointer;
  font-size: 13px;
  font-weight: 700;
  background: var(--color-card);
  border: 2px solid #e4e6ef;
  display: flex;
  align-items: center;
  gap: 8px;
  transition: all 0.2s;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.02);
}

.option-letter {
  width: 28px;
  height: 28px;
  border-radius: 9px;
  background: #f4f6f9;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  font-weight: 800;
  color: #7e8299;
  transition: all 0.2s;
}

.option:active {
  transform: scale(0.98);
}

.option.correct {
  background: #e8fff3;
  border-color: #50cd89;
  color: #186b40;
}

.option.correct .option-letter {
  background: #50cd89;
  color: #fff;
}

.option.wrong {
  background: #ffe5e5;
  border-color: #f1416c;
  color: #851e35;
}

.option.wrong .option-letter {
  background: #f1416c;
  color: #fff;
}

.streak-flash {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: 36px;
  font-weight: 800;
  color: #50cd89;
  pointer-events: none;
  animation: pop 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275) forwards;
  z-index: 99;
  text-shadow: 0 4px 20px rgba(80, 205, 137, 0.4);
}

.result-card {
  background: var(--color-card);
  border-radius: 28px;
  padding: 36px 24px;
  text-align: center;
  margin: 20px;
  box-shadow: 0 15px 40px rgba(0, 0, 0, 0.1);
}

.result-score-ring {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  margin: 0 auto 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 36px;
  font-weight: 800;
  box-shadow: inset 0 0 0 8px rgba(255, 255, 255, 0.2);
}

.result-grade {
  font-size: 22px;
  font-weight: 800;
  margin-bottom: 6px;
  color: var(--color-text-main);
}

.result-sub {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text-muted);
  margin-bottom: 24px;
}

.coin-award {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: linear-gradient(135deg, #FFD700, #F5A623);
  border-radius: 20px;
  padding: 12px 24px;
  font-size: 20px;
  font-weight: 800;
  color: #fff;
  margin-bottom: 24px;
  box-shadow: 0 8px 20px rgba(245, 166, 35, 0.3);
}

.breakdown-row {
  display: flex;
  justify-content: space-between;
  font-size: 14px;
  padding: 10px 0;
  border-bottom: 1px solid #f4f6f9;
  font-weight: 600;
}

.breakdown-row:last-child {
  border: none;
}

.leaderboard-item {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px;
  background: var(--color-card);
  border-radius: 16px;
  margin-bottom: 10px;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.03);
}

.lb-rank {
  font-size: 18px;
  min-width: 32px;
  text-align: center;
  font-weight: 800;
}

.lb-av {
  width: 44px;
  height: 44px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 15px;
  font-weight: 800;
}

.lb-info {
  flex: 1;
}

.lb-name {
  font-size: 15px;
  font-weight: 800;
  color: var(--color-text-main);
}

.lb-cat {
  font-size: 12px;
  font-weight: 600;
  color: var(--color-text-muted);
  margin-top: 2px;
}

.lb-coin {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 15px;
  font-weight: 800;
  color: #F5A623;
}

.toast {
  position: fixed;
  bottom: 110px;
  left: 20px;
  transform: translateX(-20px);
  background: #181c32;
  color: #fff;
  padding: 14px 20px;
  border-radius: 12px;
  font-size: 14px;
  font-weight: 700;
  z-index: 1000;
  transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  pointer-events: none;
  white-space: nowrap;
  opacity: 0;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
  border-left: 4px solid var(--color-brand);
}

.toast.show {
  opacity: 1;
  transform: translateX(0);
}

.coin-float {
  position: absolute;
  pointer-events: none;
  font-size: 20px;
  font-weight: 800;
  color: #F5A623;
  animation: coinRain 1s ease-out forwards;
  z-index: 1000;
  text-shadow: 0 2px 10px rgba(245, 166, 35, 0.4);
}