:root {
  --tg-bg: #ffffff;
  --tg-text: #1c1c1e;
  --tg-hint: #8e8e93;
  --tg-link: #2481cc;
  --tg-button: #2481cc;
  --tg-button-text: #ffffff;
  --tg-secondary-bg: #f0f0f3;
  --correct: #2fb463;
  --correct-soft: rgba(47, 180, 99, 0.14);
  --wrong: #e53e3e;
  --wrong-soft: rgba(229, 62, 62, 0.14);
  --warn: #f6a521;
  --card-shadow: 0 8px 28px rgba(0, 0, 0, 0.09);
}

@media (prefers-color-scheme: dark) {
  :root {
    --tg-bg: #17212b;
    --tg-text: #f5f5f5;
    --tg-hint: #7d8b99;
    --tg-secondary-bg: #232e3c;
    --card-shadow: 0 8px 28px rgba(0, 0, 0, 0.35);
  }
}

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

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  overscroll-behavior-y: contain;
}

body {
  background: var(--tg-bg);
  background-image: radial-gradient(1200px 500px at 50% -220px, color-mix(in srgb, var(--tg-link) 14%, transparent), transparent);
  color: var(--tg-text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Noto Sans", sans-serif;
  display: flex;
  flex-direction: column;
  /* Telegram WebApp'ning haqiqiy ko'rinadigan balandligi (JS orqali o'rnatiladi).
     Bu qiymat bo'lmasa 100vh'ga tushadi (brauzerda ochilganda ham ishlaydi). */
  height: var(--tg-viewport-height, 100vh);
  overflow: hidden;
  user-select: none;
  -webkit-user-select: none;
}

#app {
  flex: 1;
  min-height: 0;
  display: flex;
  flex-direction: column;
  padding: 10px 16px;
  padding-top: max(10px, env(safe-area-inset-top));
  padding-bottom: max(10px, env(safe-area-inset-bottom));
  max-width: 480px;
  margin: 0 auto;
  width: 100%;
  overflow: hidden;
}

/* ---------- Yuqori panel ---------- */

#topbar {
  display: flex;
  gap: 10px;
  margin-bottom: 8px;
  flex-shrink: 0;
}

.stat {
  flex: 1;
  background: var(--tg-secondary-bg);
  border-radius: 14px;
  padding: 6px 6px;
  text-align: center;
  box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--tg-text) 5%, transparent);
}

.stat-label {
  display: block;
  font-size: 11px;
  letter-spacing: 0.4px;
  text-transform: uppercase;
  color: var(--tg-hint);
  margin-bottom: 2px;
}

.stat-value {
  font-size: 19px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

#streak-flame {
  font-size: 15px;
  opacity: 0.25;
  transition: opacity 0.2s;
}

#streak-box.hot #streak-flame { opacity: 1; }

#streak-box.hot {
  box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--warn) 55%, transparent);
}

#score-value.bump { animation: bump 0.35s ease; }

@keyframes bump {
  0% { transform: scale(1); }
  40% { transform: scale(1.35); color: var(--correct); }
  100% { transform: scale(1); }
}

#progress-track {
  height: 5px;
  border-radius: 3px;
  background: var(--tg-secondary-bg);
  overflow: hidden;
  margin-bottom: 4px;
  flex-shrink: 0;
}

#progress-fill {
  height: 100%;
  width: 0%;
  border-radius: 3px;
  background: linear-gradient(90deg, var(--tg-link), color-mix(in srgb, var(--tg-link) 55%, var(--correct)));
  transition: width 0.4s ease;
}

/* ---------- Ekranlar ---------- */

.screen {
  flex: 1;
  min-height: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  gap: 12px;
  animation: fade-in 0.18s ease-out;
}

#screen-play {
  justify-content: flex-start;
  gap: 6px;
  padding-top: 2px;
  min-height: 0;
  /* Juda past ekranlarda (kichik telefon, katta shrift) so'nggi chora sifatida
     faqat shu ekran ichida scroll bo'ladi - butun sahifa sakramaydi. */
  overflow-y: auto;
}

.hidden { display: none !important; }

.muted { color: var(--tg-hint); font-size: 14px; }

.big-emoji { font-size: 60px; line-height: 1; }

@keyframes fade-in {
  from { opacity: 0; transform: translateY(5px); }
  to { opacity: 1; transform: translateY(0); }
}

.spinner {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  border: 3px solid var(--tg-secondary-bg);
  border-top-color: var(--tg-link);
  animation: spin 0.8s linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }

/* ---------- Taymer ---------- */

#timer-wrap {
  position: relative;
  width: 64px;
  height: 64px;
  margin: 0 auto 2px;
  flex-shrink: 0;
}

#timer-svg {
  width: 100%;
  height: 100%;
  transform: rotate(-90deg);
}

.timer-bg {
  fill: none;
  stroke: var(--tg-secondary-bg);
  stroke-width: 7;
}

.timer-ring {
  fill: none;
  stroke: var(--tg-link);
  stroke-width: 7;
  stroke-linecap: round;
  stroke-dasharray: 276.46;
  stroke-dashoffset: 0;
  transition: stroke 0.3s;
}

#timer-num {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  font-weight: 800;
  font-variant-numeric: tabular-nums;
}

#timer-wrap.warn .timer-ring { stroke: var(--warn); }
#timer-wrap.danger .timer-ring { stroke: var(--wrong); }
#timer-wrap.danger #timer-num { color: var(--wrong); }

#timer-wrap.danger {
  animation: timer-pulse 0.6s ease-in-out infinite;
}

@keyframes timer-pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.07); }
}

#qnum { margin-bottom: 2px; font-weight: 600; font-size: 13px; flex-shrink: 0; }

/* ---------- Savol kartasi ---------- */

#card {
  width: 100%;
  background: var(--tg-secondary-bg);
  border-radius: 18px;
  padding: 14px 14px 10px;
  box-shadow: var(--card-shadow);
  animation: card-in 0.25s cubic-bezier(0.2, 0.8, 0.3, 1);
  flex-shrink: 0;
}

@keyframes card-in {
  from { opacity: 0; transform: translateX(26px); }
  to { opacity: 1; transform: translateX(0); }
}

#card.swap { animation: card-in 0.25s cubic-bezier(0.2, 0.8, 0.3, 1); }

#question-text {
  font-size: 20px;
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 10px;
  min-height: 24px;
}

#answers-list {
  display: flex;
  flex-direction: column;
  gap: 7px;
}

.answer-btn {
  display: flex;
  align-items: center;
  gap: 11px;
  width: 100%;
  padding: 10px 12px;
  border-radius: 13px;
  border: 1.5px solid color-mix(in srgb, var(--tg-text) 9%, transparent);
  background: var(--tg-bg);
  color: var(--tg-text);
  font-size: 17px;
  font-weight: 500;
  cursor: pointer;
  text-align: left;
  transition: transform 0.09s, border-color 0.15s, background-color 0.15s;
}

.answer-btn:active:not(:disabled) { transform: scale(0.975); }

.answer-btn:disabled { cursor: default; opacity: 0.92; }

.answer-letter {
  flex: 0 0 26px;
  height: 26px;
  border-radius: 8px;
  background: var(--tg-secondary-bg);
  color: var(--tg-hint);
  font-size: 13px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background-color 0.15s, color 0.15s;
}

.answer-btn.correct {
  border-color: var(--correct);
  background: var(--correct-soft);
  animation: pop 0.3s ease;
}

.answer-btn.correct .answer-letter { background: var(--correct); color: #fff; }

.answer-btn.wrong {
  border-color: var(--wrong);
  background: var(--wrong-soft);
  animation: shake 0.35s ease;
}

.answer-btn.wrong .answer-letter { background: var(--wrong); color: #fff; }

.answer-btn.dim { opacity: 0.45; }

@keyframes pop {
  0% { transform: scale(1); }
  45% { transform: scale(1.035); }
  100% { transform: scale(1); }
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-6px); }
  50% { transform: translateX(5px); }
  75% { transform: translateX(-3px); }
}

#verdict-line {
  min-height: 18px;
  margin-top: 6px;
  font-size: 14px;
  font-weight: 600;
}

#verdict-line.ok { color: var(--correct); }
#verdict-line.bad { color: var(--wrong); }

/* ---------- Tugmalar ---------- */

.btn {
  padding: 12px 24px;
  border-radius: 14px;
  border: none;
  font-size: 16px;
  font-weight: 700;
  cursor: pointer;
  transition: transform 0.1s, opacity 0.15s, background-color 0.2s;
}

.btn:active:not(:disabled) { transform: scale(0.97); }

.btn:disabled { opacity: 0.45; cursor: default; }

.btn-primary {
  background: var(--tg-button);
  color: var(--tg-button-text);
  box-shadow: 0 6px 18px color-mix(in srgb, var(--tg-button) 40%, transparent);
}

#next-btn {
  width: 100%;
  margin-top: 8px;
  flex-shrink: 0;
}

.btn-skip {
  background: var(--tg-secondary-bg);
  color: var(--tg-hint);
}

.btn-go {
  background: var(--tg-button);
  color: var(--tg-button-text);
  box-shadow: 0 6px 18px color-mix(in srgb, var(--tg-button) 40%, transparent);
  animation: fade-in 0.2s ease;
}

/* ---------- Yakuniy ekran ---------- */

.finished-title { font-size: 22px; font-weight: 800; margin: 0; }

.final-score-line { font-size: 18px; }

.final-score-line b { font-size: 24px; color: var(--tg-link); }