@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&display=swap');

:root {
  --telegram-blue: #0088cc;
  --telegram-blue-dark: #006ba3;
  --telegram-blue-light: #40a7e3;
  --telegram-bg: #17212b;
  --telegram-secondary: #242f3d;

  --blue-team: #2196f3;
  --red-team: #e53935;

  --success: #2ecc71;
  --danger: #e74c3c;
  --warning: #f39c12;

  --bg-primary: #f5f5f5;
  --bg-secondary: #ffffff;

  --text-primary: #212121;
  --text-secondary: #757575;

  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.15);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.2);

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;

  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --board-max-width: 1280px;

  --board-max-height: 520px;
  --board-gap: clamp(10px, 1.6vw, 20px);

  --title-size: clamp(18px, 2.2vw, 30px);
  --panel-title-size: clamp(14px, 1.4vw, 16px);
  --problem-size: clamp(24px, 3.5vh, 38px);
  --question-size: clamp(14px, 2.2vh, 20px);
  --option-size: clamp(13px, 2vh, 16px);
  --input-size: clamp(16px, 2.4vh, 26px);

  --key-size: clamp(18px, 2.6vh, 24px);
}

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

html,
body {
  height: 100%;
}

#backgroundMusic {
  display: none;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI',
    sans-serif;
  background: #ffb3b3;
  color: var(--text-primary);

  height: 100svh;
  overflow: hidden;

  display: grid;
  grid-template-rows: auto 1fr auto;
  align-items: stretch;

  user-select: none;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
}

.game-header {
  width: 100%;
  text-align: center;
  padding: clamp(10px, 1.4vh, 14px) clamp(10px, 2vw, 18px) clamp(6px, 1vh, 10px);
}

.game-header h1 {
  font-size: var(--title-size);
  font-weight: 800;
  background: linear-gradient(135deg,
      var(--telegram-blue),
      var(--telegram-blue-dark));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: 0.6px;
}

.game-subtitle {
  margin-top: 6px;
  font-size: clamp(12px, 1.7vh, 14px);
  color: var(--text-secondary);
  max-width: 980px;
  margin-left: auto;
  margin-right: auto;
  line-height: 1.35;
  padding: 0 10px;
  white-space: pre-line;
}

.game-footer {
  text-align: center;
  padding: 12px 16px;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-top: 1px solid rgba(0, 0, 0, 0.05);
  margin-top: auto;
  width: 100%;
}

.footer-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
}

.author-text {
  font-family: 'Inter', sans-serif;
  font-size: 14px;
  color: var(--text-secondary);
  font-weight: 500;
  margin: 0;
  letter-spacing: 0.3px;
}

.author-name {
  color: var(--text-primary);
  font-weight: 700;
  background: linear-gradient(135deg, var(--telegram-blue), var(--telegram-blue-dark));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.social-links {
  display: flex;
  justify-content: center;
  gap: 16px;
}

.social-link {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: white;
  border: 1px solid rgba(0, 0, 0, 0.08);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
  color: var(--text-primary);
  font-size: 18px;
  transition: all 0.2s cubic-bezier(0.25, 0.8, 0.25, 1);
  text-decoration: none;
}

.social-link:hover {
  transform: translateY(-2px) scale(1.05);
  box-shadow: 0 4px 8px rgba(0, 50, 100, 0.15);
  border-color: var(--telegram-blue);
  color: var(--telegram-blue);
}

.social-link:active {
  transform: scale(0.95);
}

.social-link i {
  font-size: 20px;
}

.social-link:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.social-link:active {
  transform: translateY(0);
  box-shadow: var(--shadow-sm);
}

.view-controls {
  position: fixed;
  left: max(12px, env(safe-area-inset-left));
  bottom: max(12px, env(safe-area-inset-bottom));
  z-index: 1002;

  display: inline-flex;
  align-items: center;
  gap: 6px;

  padding: 6px 8px;
  border-radius: 14px;

  background: rgba(255, 255, 255, 0.92);
  border: 1px solid rgba(0, 0, 0, 0.08);
  box-shadow: var(--shadow-md);
  backdrop-filter: blur(8px);
}

.view-btn {
  width: 34px;
  height: 34px;
  border: none;
  border-radius: 10px;
  cursor: pointer;

  background: #f2f5f9;
  color: var(--telegram-blue-dark);
  box-shadow: var(--shadow-sm);

  display: grid;
  place-items: center;
  transition: var(--transition);
}

.view-btn:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.view-btn:active {
  transform: translateY(0);
  box-shadow: var(--shadow-sm);
}

.view-btn:disabled {
  opacity: 0.55;
  cursor: not-allowed;
  transform: none;
  box-shadow: var(--shadow-sm);
}

.view-label {
  min-width: 54px;
  text-align: center;
  font-weight: 800;
  font-size: 13px;
  color: var(--telegram-blue-dark);
  user-select: none;
}

.home-btn {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 1001;

  display: inline-flex;
  align-items: center;
  gap: 8px;

  padding: 8px 12px;
  border-radius: 14px;
  border: 1px solid rgba(0, 0, 0, 0.08);

  background: var(--bg-secondary);
  box-shadow: var(--shadow-md);
  color: var(--telegram-blue-dark);

  font-weight: 800;
  cursor: pointer;
  transition: var(--transition);
}

.home-btn i {
  font-size: 16px;
}

.home-btn:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.home-btn:active {
  transform: translateY(0);
  box-shadow: var(--shadow-sm);
}

.language-selector {
  position: fixed;
  top: 12px;
  right: 12px;
  display: flex;
  gap: 6px;
  z-index: 1000;
  background: var(--bg-secondary);
  padding: 6px;
  border-radius: 14px;
  box-shadow: var(--shadow-md);
}

.lang-btn {
  width: 34px;
  height: 34px;
  border: 1px solid transparent;
  background: var(--bg-primary);
  border-radius: 8px;
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
}

.lang-btn img {
  width: 100%;
  height: auto;
  border-radius: 6px;
  display: block;
}

.lang-btn:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

.lang-btn.active {
  border-color: var(--telegram-blue);
  background: var(--telegram-blue-light);
  transform: scale(1.03);
}

.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(6px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 999;
}

.modal-content {
  --modal-scale: 1;
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  width: min(720px, 92vw);

  max-height: min(86svh, 680px);
  overflow: hidden;
  transform: scale(var(--modal-scale));
  transform-origin: center;
  animation: slideUp 0.35s ease;
}

.start-modal {
  padding: clamp(18px, 2.5vw, 28px) clamp(16px, 2.5vw, 24px) clamp(18px, 2.5vw, 30px);
}

.start-modal h2 {
  text-align: center;
  font-size: clamp(20px, 2.2vw, 26px);
  font-weight: 800;
  color: var(--telegram-blue);
  margin-bottom: 16px;
}

@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(40px) scale(var(--modal-scale));
  }

  to {
    opacity: 1;
    transform: translateY(0) scale(var(--modal-scale));
  }
}

/* Stepper */
.setup-stepper {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  margin: 6px 0 18px;
}

.stepper-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  min-width: 84px;
  opacity: 0.65;
  transition: var(--transition);
}

.stepper-item.active {
  opacity: 1;
}

.stepper-item.done {
  opacity: 0.95;
}

.stepper-dot {
  width: 32px;
  height: 32px;
  border-radius: 999px;
  background: var(--bg-primary);
  border: 2px solid rgba(0, 0, 0, 0.08);
  display: grid;
  place-items: center;
  font-weight: 800;
  color: var(--telegram-blue-dark);
}

.stepper-item.active .stepper-dot {
  background: var(--telegram-blue);
  border-color: var(--telegram-blue);
  color: #fff;
}

.stepper-item.done .stepper-dot {
  background: rgba(0, 136, 204, 0.15);
  border-color: rgba(0, 136, 204, 0.45);
  color: var(--telegram-blue-dark);
}

.stepper-label {
  font-size: 12px;
  font-weight: 700;
  color: var(--text-secondary);
  text-align: center;
}

.stepper-item.active .stepper-label {
  color: var(--text-primary);
}

.stepper-line {
  width: clamp(22px, 4vw, 46px);
  height: 2px;
  background: rgba(0, 0, 0, 0.12);
  border-radius: 999px;
}

.setup-steps {
  position: relative;
  min-height: 260px;
}

.setup-step {
  position: absolute;
  inset: 0;
  opacity: 0;
  transform: translateX(16px);
  pointer-events: none;
  transition: opacity 0.25s ease, transform 0.25s ease;
}

.setup-step.active {
  opacity: 1;
  transform: translateX(0);
  pointer-events: auto;
}

.setup-step h3 {
  text-align: center;
  font-size: clamp(16px, 1.8vw, 18px);
  color: var(--text-secondary);
  margin-bottom: 10px;
}

.setup-hint {
  text-align: center;
  color: var(--text-secondary);
  font-size: 13px;
  margin-bottom: 14px;
}

.operation-buttons {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.operation-btn {
  padding: 14px 12px;
  border-radius: var(--radius-md);
  border: 2px solid transparent;
  background: var(--bg-primary);
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: 12px;
  font-weight: 700;
}

.op-symbol {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  background: #fff;
  display: grid;
  place-items: center;
  font-size: 24px;
  box-shadow: var(--shadow-sm);
}

.op-text {
  font-size: 14px;
  color: var(--text-primary);
}

.operation-btn:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

.operation-btn.active {
  border-color: var(--telegram-blue);
  background: rgba(0, 136, 204, 0.12);
}

.operation-btn.shake {
  animation: shakeInput 0.35s;
}

.operation-btn.active .op-symbol {
  background: var(--telegram-blue);
  color: #fff;
}

.difficulty-selector {
  margin-top: 6px;
}

.difficulty-buttons {
  display: flex;
  gap: 10px;
  justify-content: center;
  flex-wrap: wrap;
}

.difficulty-btn {
  flex: 1 1 30%;
  padding: 12px 10px;
  max-width: 180px;
  border: 2px solid transparent;
  background: var(--bg-primary);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  font-weight: 700;
}

.difficulty-btn i {
  font-size: 24px;
}

.difficulty-btn:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

.difficulty-btn.active {
  border-color: var(--telegram-blue);
  background: var(--telegram-blue);
  color: #fff;
}

/* Teams */
.team-setup {
  display: flex;
  gap: 14px;
  align-items: center;
  justify-content: center;
}

.team-box {
  flex: 1;
  background: var(--bg-primary);
  padding: 16px 14px;
  border-radius: var(--radius-md);
  text-align: center;
  transition: var(--transition);
}

.team-left {
  border: 2px solid var(--blue-team);
}

.team-right {
  border: 2px solid var(--red-team);
}

.team-icon {
  font-size: 34px;
  margin-bottom: 8px;
}

.team-left .team-icon {
  color: var(--blue-team);
}

.team-right .team-icon {
  color: var(--red-team);
}

.team-box h3 {
  font-size: 16px;
  margin-bottom: 10px;
}

.team-box input {
  width: 100%;
  padding: 10px 12px;
  font-size: 16px;
  border-radius: var(--radius-sm);
  border: 1px solid #ddd;
  text-align: center;
  font-family: inherit;
  transition: var(--transition);
}

.team-box input:focus {
  outline: none;
  border-color: var(--telegram-blue);
  box-shadow: 0 0 0 3px rgba(0, 136, 204, 0.15);
}

.vs-divider {
  font-size: 22px;
  font-weight: 800;
  color: var(--telegram-blue);
  padding: 6px 14px;
  background: var(--bg-secondary);
  border-radius: 50%;
  min-width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.setup-nav {
  display: flex;
  gap: 12px;
  align-items: center;
  justify-content: center;
  margin-top: 18px;
}

.primary-btn,
.secondary-btn {
  padding: 12px 16px;
  font-size: 16px;
  font-weight: 800;
  font-family: inherit;
  border-radius: var(--radius-md);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  transition: var(--transition);
  border: none;
  box-shadow: var(--shadow-md);
}

.primary-btn {
  color: #fff;
  background: linear-gradient(135deg,
      var(--telegram-blue),
      var(--telegram-blue-dark));
}

.secondary-btn {
  color: var(--text-primary);
  background: #fff;
  border: 2px solid rgba(0, 0, 0, 0.08);
  box-shadow: var(--shadow-sm);
}

.primary-btn:hover,
.secondary-btn:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.primary-btn:active,
.secondary-btn:active {
  transform: translateY(0);
  box-shadow: var(--shadow-sm);
}

.secondary-btn:disabled,
.primary-btn:disabled {
  opacity: 0.55;
  cursor: not-allowed;
  transform: none;
  box-shadow: var(--shadow-sm);
}

.nav-btn {
  min-width: 180px;
}

.countdown-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.82);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 998;
  font-size: clamp(56px, 10vw, 90px);
  font-weight: 900;
  color: #fff;
  text-shadow: 0 0 22px rgba(0, 136, 204, 0.9);
}

.countdown-overlay.go {
  color: var(--success);
}

.game-shell {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 clamp(10px, 1.8vw, 18px);
  overflow: hidden;
}

.game-stage {
  --game-scale: 1;
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  transform: scale(var(--game-scale));
  transform-origin: center;
  transition: transform 0.25s ease;
  will-change: transform;
}

.game-board {
  width: var(--board-max-width);
  max-width: 100%;
  height: var(--board-max-height);
  max-height: 100%;

  display: grid;
  gap: var(--board-gap);
  align-items: stretch;

  grid-template-columns: 0.92fr 1.7fr 0.92fr;
  grid-template-areas: 'left arena right';
}

.panel-left {
  grid-area: left;
}

.panel-right {
  grid-area: right;
}

.arena-container {
  grid-area: arena;
}

.calculator-panel,
.arena-container {
  min-height: 0;
  overflow: hidden;
}

.calculator-panel {
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  display: flex;
  flex-direction: column;
}

.calculator-panel.finished {
  opacity: 0.75;
}

.panel-left {
  border-top: 4px solid var(--blue-team);
}

.panel-right {
  border-top: 4px solid var(--red-team);
}

.panel-header {
  padding: 10px 12px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-weight: 800;
  font-size: var(--panel-title-size);
  flex: 0 0 auto;
}

.panel-left .panel-header {
  background: linear-gradient(135deg, var(--blue-team), #1976d2);
  color: #fff;
}

.panel-right .panel-header {
  background: linear-gradient(135deg, var(--red-team), #c62828);
  color: #fff;
}

.panel-header h3 {
  flex: 1;
  margin-right: 10px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.score-badge {
  background: #fff;
  color: var(--telegram-blue);
  padding: 4px 10px;
  border-radius: 18px;
  font-size: clamp(16px, 2.2vh, 20px);
  font-weight: 900;
  min-width: 36px;
  text-align: center;
  flex: 0 0 auto;
}

.problem-display {
  padding: 12px 12px;
  text-align: center;
  font-size: var(--question-size);
  font-weight: 800;
  min-height: 86px;
  max-height: clamp(86px, 18vh, 150px);
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  flex: 0 0 auto;
  line-height: 1.2;
  white-space: normal;
  word-break: break-word;
}

.problem-display span {
  display: block;
  white-space: normal;
}

.problem-display.correct {
  background: #2e7d32 !important;
  color: #fff !important;
}

.problem-display.wrong {
  background: #b71c1c !important;
  color: #fff !important;
}

.panel-left .problem-display {
  background: #e3f2fd;
  color: var(--blue-team);
}

.panel-right .problem-display {
  background: #ffebee;
  color: var(--red-team);
}

.answer-input {
  width: calc(100% - 28px);
  margin: 8px 14px 10px;
  padding: 8px 10px;
  font-size: var(--input-size);
  font-weight: 900;
  font-family: 'Inter', monospace;
  text-align: center;
  border-radius: 12px;
  border: 2px solid #e0e0e0;
  transition: var(--transition);
  flex: 0 0 auto;
}

.answer-input:focus {
  outline: none;
  border-color: var(--telegram-blue);
  box-shadow: 0 0 0 3px rgba(0, 136, 204, 0.15);
}

.answer-input.correct {
  background: #d4edda;
  border-color: var(--success);
}

.answer-input.incorrect {
  background: #f8d7da;
  border-color: var(--danger);
}

.answer-input.shake {
  animation: shakeInput 0.4s;
}

@keyframes shakeInput {

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

  25% {
    transform: translateX(-6px);
  }

  75% {
    transform: translateX(6px);
  }
}

.keypad {
  flex: 1 1 auto;
  min-height: 0;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: repeat(4, minmax(0, 1fr));
  gap: 7px;
  padding: 10px 12px 12px;
  background: var(--bg-primary);
}

.key-btn {
  border: none;
  border-radius: 12px;
  cursor: pointer;
  background: #fff;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);

  font-size: var(--key-size);
  font-weight: 900;
  font-family: inherit;

  display: grid;
  place-items: center;
  min-height: 0;
}

.key-btn:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.key-btn:active {
  transform: translateY(0);
  box-shadow: none;
}

.key-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
  box-shadow: var(--shadow-sm);
}

.key-clear {
  background: linear-gradient(135deg, var(--danger), #c0392b);
  color: #fff;
}

.key-submit {
  background: linear-gradient(135deg,
      var(--telegram-blue),
      var(--telegram-blue-dark));
  color: #fff;
}

.quiz-keypad {
  flex: 1 1 auto;
  min-height: 0;
  display: grid;

  grid-template-columns: repeat(2, minmax(0, 1fr));
  grid-auto-rows: minmax(56px, auto);
  gap: 10px;
  padding: 12px 12px 14px;
  background: var(--bg-primary);

  align-content: center;
}

.quiz-btn {
  border: none;
  border-radius: 12px;
  cursor: pointer;
  background: #e0f7fa;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);

  font-size: var(--option-size);
  font-weight: 800;
  font-family: inherit;
  line-height: 1.15;

  padding: 12px 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;

  min-height: clamp(52px, 7.5vh, 86px);
  word-break: break-word;
}

.quiz-btn:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.quiz-btn:active {
  transform: translateY(0);
  box-shadow: none;
}

.quiz-btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
  box-shadow: var(--shadow-sm);
}

.quiz-btn.correct {
  background: var(--success);
  color: #fff;
}

.quiz-btn.wrong {
  background: var(--danger);
  color: #fff;
}

.quiz-btn.shake {
  animation: shakeInput 0.4s;
}

.arena-container {
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  padding: 12px 12px 14px;
  display: flex;
  flex-direction: column;
}

.arena-scoreboard {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 12px;
  background: linear-gradient(135deg, #f5f5f5, #e0e0e0);
  border-radius: 12px;
  font-size: 13px;
  flex: 0 0 auto;
}

.score-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  font-weight: 700;
  min-width: 84px;
}

.score-value {
  font-size: clamp(18px, 2.8vh, 26px);
  font-weight: 900;
  color: var(--telegram-blue);
}

.timer-display {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: clamp(14px, 2vh, 18px);
  font-weight: 900;
  color: var(--telegram-blue);
}

.arena {
  position: relative;
  flex: 1 1 auto;
  min-height: 0;

  width: 100%;
  background-color: #ffffff;
  border-radius: 14px;
  margin-top: 12px;

  display: flex;
  align-items: center;
  justify-content: center;

  overflow: hidden;
  box-shadow: 0 3px 12px rgba(0, 0, 0, 0.12);
}

.center-line {
  position: absolute;
  left: 48%;
  top: 0;
  bottom: 0;
  width: 2px;
  background: repeating-linear-gradient(to bottom,
      #333 0,
      #333 8px,
      transparent 8px,
      transparent 16px);
  transform: translateX(-50%);
  z-index: 2;
  opacity: 0.7;
}

.rope-container {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  width: 92%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  z-index: 1;
}

.rope-container video {
  width: 100%;
  height: auto;
  display: block;
}

#win-video,
.win-video-wrap {
  position: absolute;
  left: 50%;
  top: 15%;
  transform: translate(-50%, -50%);
  width: 92%;
  z-index: 3;
  pointer-events: none;
}

.win-video {
  position: absolute;
  inset: 0;
  width: 100%;
}

.winner-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.7);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 5;
}

.winner-content {
  text-align: center;
  color: #fff;
  padding: 24px;
}

.trophy-animation {
  font-size: clamp(52px, 7vw, 76px);
  margin-bottom: 14px;
}

.winner-title {
  font-size: clamp(22px, 3.5vw, 34px);
  font-weight: 900;
  margin-bottom: 8px;
}

.winner-message {
  font-size: clamp(14px, 2.1vw, 18px);
  margin-bottom: 18px;
}

.winner-stats {
  display: flex;
  gap: 24px;
  justify-content: center;
  margin-bottom: 20px;
  flex-wrap: wrap;
}

.stat-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
}

.stat-item i {
  font-size: 22px;
}

.stat-item span {
  font-size: 26px;
  font-weight: 900;
}

.stat-item small {
  font-size: 13px;
}

.confetti {
  position: absolute;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  animation: confettiFall 3s linear;
  pointer-events: none;
  z-index: 6;
}

@keyframes confettiFall {
  to {
    transform: translateY(110vh) rotate(360deg);
    opacity: 0;
  }
}

@media (max-width: 820px) {
  :root {
    --board-max-height: 100%;
  }

  .game-board {
    grid-template-columns: 1fr 1fr;

    grid-template-rows: 0.82fr 1.18fr;
    grid-template-areas:
      'arena arena'
      'left right';
  }

  .calculator-panel {
    height: 100%;
  }

  .quiz-keypad {
    align-content: stretch;
    grid-auto-rows: minmax(0, 1fr);
    gap: clamp(8px, 1.6vw, 10px);
    padding: 10px 10px 12px;
  }

  .quiz-btn {
    min-height: 0;
    padding: clamp(8px, 1.8vh, 12px) 6px;
    border-radius: 10px;
  }

  .arena-scoreboard {
    font-size: 12px;
  }

  .score-item {
    min-width: 70px;
  }

  .team-setup {
    flex-direction: column;
  }

  .vs-divider {
    min-width: 52px;
    height: 52px;
  }

  .nav-btn {
    min-width: 0;
    flex: 1;
  }

  .setup-nav {
    flex-wrap: wrap;
  }
}

@media (max-width: 480px) {
  :root {
    --option-size: clamp(11px, 1.8vh, 14px);
  }

  .language-selector {
    top: 10px;
    right: 10px;
    padding: 5px;
    gap: 5px;
  }

  .lang-btn {
    width: 30px;
    height: 30px;
  }

  .operation-buttons {
    gap: 10px;
  }

  .operation-btn {
    padding: 12px 10px;
  }

  .op-symbol {
    width: 38px;
    height: 38px;
    font-size: 22px;
  }

  .setup-steps {
    min-height: 280px;
  }

  .quiz-keypad {
    gap: 8px;
    padding: 10px 10px 12px;
  }

  .quiz-btn {
    padding: 8px 6px;
  }
}

@media (max-height: 820px) {
  .modal-content {
    max-height: min(88svh, 660px);
  }

  .start-modal {
    padding: 18px 16px 18px;
  }

  .start-modal h2 {
    margin-bottom: 12px;
  }

  .setup-stepper {
    margin: 4px 0 14px;
  }

  .setup-steps {
    min-height: 240px;
  }

  .team-icon {
    font-size: 30px;
    margin-bottom: 6px;
  }

  .team-box {
    padding: 12px 12px;
  }

  .setup-nav {
    margin-top: 14px;
  }
}

@media (max-height: 620px) {
  .modal-content {
    overflow: auto;
  }
}

@media (hover: none) and (pointer: coarse) {

  .key-btn:hover,
  .primary-btn:hover,
  .secondary-btn:hover,
  .difficulty-btn:hover,
  .team-box:hover,
  .operation-btn:hover {
    transform: none;
    box-shadow: none;
  }

  .key-btn:active,
  .primary-btn:active,
  .secondary-btn:active {
    transform: scale(0.98);
  }
}

/* Custom Question Input */
.question-input-area {
  width: 100%;
  height: clamp(150px, 30vh, 320px);
  padding: 12px;
  border-radius: var(--radius-md);
  border: 2px solid rgba(0, 0, 0, 0.1);
  background: var(--bg-primary);
  font-family: monospace;
  font-size: 14px;
  line-height: 1.5;
  resize: none;
  margin-bottom: 20px;
  transition: var(--transition);
}

.question-input-area:focus {
  outline: none;
  border-color: var(--telegram-blue);
  box-shadow: 0 0 0 4px rgba(0, 136, 204, 0.1);
}

/* Question Images */
.problem-display {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 10px;
}

.problem-image {
  max-width: 100%;
  max-height: 120px;
  border-radius: var(--radius-sm);
  object-fit: contain;
  box-shadow: var(--shadow-sm);
}

/* GLOBAL HOME BUTTON – FAR LEFT */
.global-home-btn {
  position: fixed;
  top: 14px;
  left: 14px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: none;
  background: #1f1f1f;
  color: #fff;
  cursor: pointer;

  display: flex;
  align-items: center;
  justify-content: center;

  z-index: 2000;
  box-shadow: 0 4px 10px rgba(0,0,0,0.35);
  transition: transform 0.15s ease, background 0.2s ease;
}

.global-home-btn:hover {
  background: #333;
  transform: scale(1.08);
}

.global-home-btn i {
  font-size: 18px;
}