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

:root {
  --kvibe-surface: #191b24;
  --kvibe-grid-dot: rgba(50, 52, 62, 0.45);
  --kvibe-accent: #bdf077;
  --kvibe-purple: #9a56c0;
  --kvibe-blue: #339af0;
  --kvibe-pink: #f06595;
  --kvibe-orange: #ff922b;
  --kvibe-green: #51cf66;
  --kvibe-red: #ff6b6b;
  --slide-transition: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: 'Inter', 'SN Pro', system-ui, sans-serif;
  color: #e8eaf0;
  background-color: var(--kvibe-surface);
  background-image: radial-gradient(
    var(--kvibe-grid-dot) 1px,
    var(--kvibe-surface) 1px
  );
  background-size: 20px 20px;
  overflow: hidden;
}

.presentation {
  position: relative;
  width: 100vw;
  height: 100vh;
  overflow: hidden;
}

/* === ПРОГРЕСС-БАР === */
.progress-bar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: rgba(255, 255, 255, 0.1);
  z-index: 100;
}
.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--kvibe-accent), var(--kvibe-purple));
  transition: width var(--slide-transition);
  width: 5%;
}

/* === СЧЁТЧИК === */
.slide-counter {
  position: fixed;
  top: 16px;
  right: 20px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 14px;
  color: rgba(255, 255, 255, 0.5);
  z-index: 100;
}

/* === КНОПКИ НАВИГАЦИИ === */
.nav-btn {
  position: fixed;
  top: 50%;
  transform: translateY(-50%);
  width: 50px;
  height: 50px;
  border: none;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.1);
  color: white;
  font-size: 24px;
  cursor: pointer;
  z-index: 100;
  transition: all 0.3s ease;
  backdrop-filter: blur(10px);
}
.nav-btn:hover {
  background: rgba(255, 255, 255, 0.2);
  transform: translateY(-50%) scale(1.1);
}
.nav-btn:active {
  transform: translateY(-50%) scale(0.95);
}
.nav-btn--prev { left: 20px; }
.nav-btn--next { right: 20px; }
.nav-btn:disabled {
  opacity: 0.3;
  cursor: not-allowed;
}

/* === ПОДСКАЗКА КЛАВИАТУРЫ === */
.keyboard-hint {
  position: fixed;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  color: rgba(255, 255, 255, 0.3);
  z-index: 100;
}
.keyboard-hint span {
  background: rgba(255, 255, 255, 0.1);
  padding: 2px 8px;
  border-radius: 4px;
  margin: 0 2px;
}

/* === КОНТЕЙНЕР СЛАЙДОВ === */
.slides-container {
  position: relative;
  width: 100%;
  height: 100%;
}

/* === СЛАЙД === */
.slide {
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 60px 80px;
  opacity: 0;
  visibility: hidden;
  transform: translateX(50px);
  transition: all var(--slide-transition);
}
.slide.active {
  opacity: 1;
  visibility: visible;
  transform: translateX(0);
}
.slide.slide-exit-left {
  opacity: 0;
  visibility: visible;
  transform: translateX(-50px);
}
.slide.slide-exit-right {
  opacity: 0;
  visibility: visible;
  transform: translateX(50px);
}
.slide.slide-enter-left {
  transform: translateX(-50px);
}
.slide.slide-enter-right {
  transform: translateX(50px);
}
.slide-content {
  max-width: 900px;
  width: 100%;
  text-align: center;
}

/* Модификаторы слайдов */
.slide--gradient {
  background: linear-gradient(135deg, rgba(154, 86, 192, 0.1) 0%, rgba(51, 154, 240, 0.1) 100%);
}
.slide--final {
  background: linear-gradient(135deg, rgba(189, 240, 119, 0.1) 0%, rgba(154, 86, 192, 0.1) 100%);
}
.slide--alert {
  background: linear-gradient(135deg, rgba(255, 107, 107, 0.08) 0%, rgba(255, 146, 43, 0.08) 100%);
}

/* === ТИТУЛЬНЫЙ === */
.slide--title .slide-content {
  display: flex;
  flex-direction: column;
  align-items: center;
}
.emoji-big {
  font-size: 80px;
  margin-bottom: 20px;
  animation: bounce 2s ease-in-out infinite;
}
@keyframes bounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}
.main-title {
  font-size: 56px;
  font-weight: 800;
  background: linear-gradient(135deg, var(--kvibe-accent), var(--kvibe-purple));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 10px;
}
.subtitle {
  font-size: 24px;
  font-weight: 400;
  color: #b8b8c8;
  margin-bottom: 30px;
}
.decorative-line {
  width: 100px;
  height: 4px;
  background: linear-gradient(90deg, var(--kvibe-accent), var(--kvibe-purple));
  border-radius: 2px;
  margin-bottom: 20px;
}

/* === ЗАГОЛОВОК СЛАЙДА === */
.slide-header {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 15px;
  margin-bottom: 35px;
}
.slide-header .emoji { font-size: 40px; }
.slide-header h2 {
  font-size: 34px;
  font-weight: 700;
  color: #fff;
}

/* === ИНФО-КАРТОЧКА / TASK-CARD === */
.task-card {
  background: rgba(255, 255, 255, 0.05);
  border-radius: 16px;
  padding: 25px 30px;
  text-align: left;
  max-width: 700px;
  margin: 0 auto 20px;
  border: 2px solid rgba(255, 255, 255, 0.08);
  font-size: 16px;
  line-height: 1.6;
  color: #b8b8c8;
}
.task-card p { margin-bottom: 8px; }
.task-card p:last-child { margin-bottom: 0; }
.task-card strong { color: var(--kvibe-accent); }

.task-badge {
  display: inline-block;
  background: var(--kvibe-purple);
  color: #fff;
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: 20px;
  margin-bottom: 12px;
}
.task-title {
  font-size: 20px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 10px;
}

/* === ПОДСКАЗКА / TIP === */
.tip-box {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: rgba(189, 240, 119, 0.15);
  border-left: 4px solid var(--kvibe-accent);
  padding: 14px 20px;
  border-radius: 0 12px 12px 0;
  font-size: 16px;
  color: #e8eaf0;
  margin-top: 15px;
}
.tip-icon { font-size: 20px; }

.highlight-box {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: rgba(51, 154, 240, 0.15);
  border-left: 4px solid var(--kvibe-blue);
  padding: 14px 20px;
  border-radius: 0 12px 12px 0;
  font-size: 16px;
  color: #e8eaf0;
  margin-top: 15px;
}

/* === ИНТЕРЕСЫ === */
.quiz-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  max-width: 600px;
  margin: 0 auto;
}
.quiz-card {
  background: rgba(255, 255, 255, 0.05);
  border-radius: 16px;
  padding: 22px 16px;
  text-align: center;
  transition: all 0.3s ease;
  border: 2px solid transparent;
}
.quiz-card:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: var(--kvibe-accent);
  transform: translateY(-4px);
}
.quiz-icon { font-size: 36px; margin-bottom: 10px; }
.quiz-card p { font-size: 15px; color: #b8b8c8; margin-top: 8px; }

/* === ДЕМО МЫШИ === */
.mouse-demo {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 18px;
}
.mouse-visual {
  position: relative;
  width: 100px;
  height: 160px;
}
.mouse-body {
  width: 100px;
  height: 130px;
  background: linear-gradient(180deg, #3a3d4a 0%, #2a2d38 100%);
  border-radius: 50px 50px 35px 35px;
  position: relative;
  box-shadow: 0 4px 20px rgba(0,0,0,0.4);
  cursor: pointer;
  border: 1px solid rgba(255,255,255,0.1);
}
.mouse-btn-left, .mouse-btn-right {
  position: absolute;
  top: 8px;
  width: 44px;
  height: 55px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.7rem;
  font-weight: 700;
  transition: background 0.15s;
  cursor: pointer;
  color: #b8b8c8;
}
.mouse-btn-left {
  left: 4px;
  border-radius: 44px 0 0 0;
  background: rgba(255,255,255,0.08);
}
.mouse-btn-left:hover, .mouse-btn-left.pressed {
  background: rgba(189,240,119,0.3);
  color: var(--kvibe-accent);
}
.mouse-btn-right {
  right: 4px;
  border-radius: 0 44px 0 0;
  background: rgba(255,255,255,0.08);
}
.mouse-btn-right:hover, .mouse-btn-right.pressed {
  background: rgba(154,86,192,0.3);
  color: var(--kvibe-purple);
}
.mouse-wheel {
  position: absolute;
  top: 25px;
  left: 50%;
  transform: translateX(-50%);
  width: 8px;
  height: 18px;
  background: #555;
  border-radius: 4px;
  cursor: pointer;
  transition: background 0.15s;
}
.mouse-wheel:hover, .mouse-wheel.pressed {
  background: var(--kvibe-orange);
}
.mouse-cord {
  position: absolute;
  bottom: -20px;
  left: 50%;
  transform: translateX(-50%);
  width: 4px;
  height: 30px;
  background: linear-gradient(180deg, #555, transparent);
  border-radius: 2px;
}
.mouse-info {
  background: rgba(255, 255, 255, 0.08);
  border: 2px solid rgba(255, 255, 255, 0.12);
  border-radius: 12px;
  padding: 12px 20px;
  color: white;
  font-weight: 600;
  min-height: 48px;
  transition: all 0.3s;
  font-size: 15px;
}

/* === КЛИК-ДЕМО === */
.click-demo {
  display: flex;
  gap: 20px;
  justify-content: center;
  margin: 18px 0;
}
.click-area {
  background: rgba(255,255,255,0.06);
  border: 2px solid rgba(255,255,255,0.1);
  border-radius: 16px;
  padding: 20px;
  width: 200px;
  cursor: pointer;
  transition: all 0.2s;
}
.click-area:hover {
  border-color: var(--kvibe-accent);
  transform: scale(1.03);
}
.click-area:active { transform: scale(0.97); }
.click-target { font-size: 3rem; display: block; margin-bottom: 8px; }
.click-label { font-size: 0.85rem; color: #888; font-weight: 600; }
.click-result {
  margin-top: 10px;
  font-size: 1.1rem;
  font-weight: 700;
  min-height: 28px;
  transition: all 0.3s;
}

/* === DRAG-AND-DROP === */
.drag-playground {
  position: relative;
  width: 320px;
  height: 160px;
  margin: 15px auto;
  background: rgba(255,255,255,0.04);
  border-radius: 16px;
  border: 2px dashed rgba(255,255,255,0.15);
}
.drag-item {
  position: absolute;
  font-size: 2.5rem;
  cursor: grab;
  transition: transform 0.1s;
  z-index: 10;
}
.drag-item:active { cursor: grabbing; transform: scale(1.15); }
.drag-item.in-bucket { opacity: 0.3; pointer-events: none; }
.drag-bucket {
  position: absolute;
  bottom: 10px;
  right: 10px;
  width: 80px;
  height: 70px;
  background: rgba(255,255,255,0.06);
  border: 2px dashed rgba(255,255,255,0.2);
  border-radius: 12px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  transition: all 0.3s;
}
.drag-bucket span { font-size: 1.8rem; }
.drag-bucket p { font-size: 0.6rem; color: rgba(255,255,255,0.5); margin-top: 2px; }
.drag-bucket.highlight {
  background: rgba(81,207,102,0.2);
  border-color: var(--kvibe-green);
  transform: scale(1.05);
}

/* === ДЕМО-ОКНО === */
.demo-window {
  background: #2a2d38;
  border-radius: 10px;
  box-shadow: 0 8px 32px rgba(0,0,0,0.4);
  overflow: hidden;
  margin: 15px auto;
  max-width: 320px;
  transition: transform 0.3s, opacity 0.3s;
  position: relative;
  border: 1px solid rgba(255,255,255,0.08);
}
.window-titlebar {
  background: linear-gradient(135deg, #3b82f6, #2563eb);
  color: white;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 6px 10px;
  cursor: grab;
  user-select: none;
}
.window-titlebar:active { cursor: grabbing; }
.window-title {
  font-size: 0.85rem;
  font-weight: 700;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.window-buttons { display: flex; gap: 4px; }
.win-btn {
  width: 26px; height: 26px;
  border: none;
  border-radius: 50%;
  font-size: 0.7rem;
  font-weight: 900;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s, transform 0.1s;
}
.win-btn.minimize { background: #ffd93d; color: #333; }
.win-btn.minimize:hover { background: #ffcc00; transform: scale(1.15); }
.win-btn.maximize { background: #6bcb77; color: white; }
.win-btn.maximize:hover { background: #5ab86a; transform: scale(1.15); }
.win-btn.close { background: #ff6b6b; color: white; }
.win-btn.close:hover { background: #ee5a5a; transform: scale(1.15); }
.window-body {
  padding: 20px;
  font-size: 1rem;
  min-height: 80px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: #b8b8c8;
}

/* === АНИМАЦИОННАЯ ЗОНА === */
.animation-area {
  position: relative;
  height: 220px;
  margin: 10px auto;
  max-width: 350px;
}

/* === ПАНЕЛЬ ЗАДАЧ МОК === */
.taskbar-mock {
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  background: rgba(0,0,0,0.6);
  border-radius: 8px 8px 0 0;
  padding: 4px 12px;
  display: flex;
  gap: 8px;
}
.taskbar-item {
  width: 40px; height: 34px;
  background: rgba(255,255,255,0.1);
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  cursor: pointer;
  transition: background 0.2s;
}
.taskbar-item:hover { background: rgba(255,255,255,0.2); }
.taskbar-item.active {
  background: rgba(255,255,255,0.2);
  border-bottom: 2px solid var(--kvibe-accent);
}

/* === АНИМАЦИИ ОКОН === */
@keyframes minimizeAnim {
  0% { transform: scale(1); opacity: 1; }
  60% { transform: scale(0.3) translateY(40px); opacity: 0.6; }
  100% { transform: scale(0) translateY(120px); opacity: 0; pointer-events: none; }
}
@keyframes restoreAnim {
  0% { transform: scale(0) translateY(120px); opacity: 0; pointer-events: none; }
  40% { transform: scale(0.3) translateY(40px); opacity: 0.6; }
  100% { transform: scale(1) translateY(0); opacity: 1; pointer-events: all; }
}
@keyframes closeAnim {
  0% { transform: scale(1); opacity: 1; }
  100% { transform: scale(0.2); opacity: 0; pointer-events: none; }
}
.hidden-at-start {
  opacity: 0;
  transform: scale(0) translateY(120px);
  pointer-events: none;
}
.animate-minimize { animation: minimizeAnim 0.7s forwards ease-in-out; }
.animate-restore { animation: restoreAnim 0.7s forwards ease-in-out; }
.animate-close { animation: closeAnim 0.5s forwards ease-in-out; }

/* === ТАСКБАР ДЕМО === */
.taskbar-demo { margin: 15px 0; }
.taskbar-full {
  display: flex;
  align-items: center;
  background: rgba(0,0,0,0.5);
  border-radius: 10px;
  padding: 6px 12px;
  max-width: 500px;
  margin: 0 auto;
  border: 1px solid rgba(255,255,255,0.08);
}
.taskbar-start {
  padding: 0 12px 0 0;
  border-right: 1px solid rgba(255,255,255,0.15);
}
.start-btn {
  font-size: 1.3rem;
  color: white;
  cursor: pointer;
  padding: 4px 8px;
  border-radius: 4px;
  transition: background 0.2s;
}
.start-btn:hover { background: rgba(255,255,255,0.15); }
.taskbar-programs {
  display: flex;
  gap: 6px;
  padding: 0 12px;
  flex: 1;
}
.taskbar-prog {
  width: 42px; height: 38px;
  background: rgba(255,255,255,0.08);
  border-radius: 6px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  position: relative;
  cursor: pointer;
  transition: background 0.2s;
}
.taskbar-prog:hover { background: rgba(255,255,255,0.15); }
.taskbar-indicator {
  position: absolute;
  bottom: -6px; left: 50%;
  transform: translateX(-50%);
  width: 16px; height: 3px;
  background: var(--kvibe-accent);
  border-radius: 2px;
}
.taskbar-tray {
  padding-left: 12px;
  border-left: 1px solid rgba(255,255,255,0.15);
}
.tray-clock {
  color: rgba(255,255,255,0.6);
  font-size: 0.8rem;
  font-weight: 600;
}

/* === ПЕРЕКЛЮЧЕНИЕ === */
.switch-demo { margin: 15px 0; }
.switch-taskbar {
  display: flex;
  gap: 12px;
  justify-content: center;
  margin-bottom: 15px;
}
.switch-prog {
  background: rgba(255,255,255,0.06);
  border: 2px solid transparent;
  border-radius: 12px;
  padding: 10px 20px;
  cursor: pointer;
  transition: all 0.2s;
  text-align: center;
}
.switch-prog:hover { background: rgba(255,255,255,0.12); }
.switch-prog.active {
  background: rgba(255,255,255,0.15);
  border-color: var(--kvibe-accent);
}
.switch-prog span { font-size: 1.8rem; display: block; }
.switch-prog p { color: #b8b8c8; font-size: 0.8rem; margin-top: 4px; }
.switch-window {
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: 12px;
  padding: 25px;
  min-height: 80px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s;
}
.switch-window-content {
  font-size: 1.1rem;
  font-weight: 700;
  color: #e8eaf0;
}

/* === ЗАПУСК ПРОГРАММ === */
.launch-methods {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin: 15px 0;
}
.launch-card {
  background: rgba(255,255,255,0.05);
  border-radius: 14px;
  padding: 18px 14px;
  border: 1px solid rgba(255,255,255,0.08);
  text-align: center;
}
.launch-icon {
  font-size: 1rem;
  display: block;
  width: 50px; height: 50px;
  line-height: 50px;
  background: linear-gradient(135deg, var(--kvibe-accent), var(--kvibe-purple));
  color: var(--kvibe-surface);
  border-radius: 12px;
  margin: 0 auto 10px;
  font-weight: 700;
}
.launch-card h3 {
  font-size: 0.95rem;
  color: #e8eaf0;
  margin-bottom: 6px;
}
.launch-card p {
  font-size: 0.8rem;
  color: #888;
  line-height: 1.4;
}

/* === КАБИНЕТ === */
.cabinet-features {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 15px;
  margin: 15px 0;
}
.feature-card {
  background: rgba(255,255,255,0.05);
  border-radius: 14px;
  padding: 20px;
  border: 1px solid rgba(255,255,255,0.08);
  text-align: center;
}
.feature-emoji { font-size: 2.5rem; display: block; margin-bottom: 8px; }
.feature-card h3 { font-size: 1rem; color: #e8eaf0; margin-bottom: 6px; }
.feature-card p { font-size: 0.85rem; color: #888; }

/* === ИТОГИ === */
.summary-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin: 15px 0;
}
.summary-card {
  background: rgba(255,255,255,0.05);
  border-radius: 14px;
  padding: 16px;
  border: 1px solid rgba(255,255,255,0.08);
  text-align: center;
}
.summary-emoji { font-size: 2rem; display: block; margin-bottom: 6px; }
.summary-card h3 { font-size: 1rem; color: #e8eaf0; margin-bottom: 4px; }
.summary-card p { font-size: 0.8rem; color: #888; line-height: 1.4; }

/* === ЧЕКЛИСТ === */
.graduation-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  max-width: 600px;
  margin: 0 auto;
}
.grad-item {
  display: flex;
  align-items: center;
  gap: 12px;
  background: rgba(255,255,255,0.05);
  border-radius: 10px;
  padding: 12px 18px;
  font-size: 16px;
  opacity: 0;
  transform: translateX(-20px);
  animation: slideIn 0.5s ease forwards;
  animation-delay: var(--delay);
}
.slide.active .grad-item {
  opacity: 1;
  transform: translateX(0);
}
@keyframes slideIn {
  to { opacity: 1; transform: translateX(0); }
}
.grad-check { font-size: 20px; }

/* === ФИНАЛ === */
.final-emoji {
  font-size: 80px;
  margin: 30px 0 10px;
  animation: pulse 1.5s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.1); }
}
.final-text {
  font-size: 32px;
  font-weight: 700;
  color: var(--kvibe-accent);
}

/* === ANNOTATIONS === */
.annotated { position: relative; overflow: visible; }
.annotation {
  position: absolute;
  display: flex;
  align-items: center;
  gap: 6px;
  pointer-events: none;
}
.annotation-dot {
  width: 10px; height: 10px;
  border-radius: 50%;
  background: var(--kvibe-accent);
  animation: dotPulse 1.5s infinite;
  flex-shrink: 0;
}
@keyframes dotPulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(189,240,119,0.5); }
  50% { box-shadow: 0 0 0 6px rgba(189,240,119,0); }
}
.annotation-line-h {
  width: 24px; height: 2px;
  background: var(--kvibe-accent);
  flex-shrink: 0;
}
.annotation-text {
  background: var(--kvibe-accent);
  color: var(--kvibe-surface);
  padding: 4px 12px;
  border-radius: 8px;
  font-size: 0.78rem;
  font-weight: 700;
  white-space: nowrap;
}
.ann-title {
  top: 50%;
  left: -155px;
  transform: translateY(-50%);
}

/* === RESIZE === */
.resizable-window {
  max-width: 320px;
  min-width: 180px;
  min-height: 100px;
}
.resize-handle { position: absolute; z-index: 10; }
.rh-right { top: 0; right: -4px; width: 8px; height: 100%; cursor: ew-resize; }
.rh-bottom { bottom: -4px; left: 0; width: 100%; height: 8px; cursor: ns-resize; }
.rh-corner { bottom: -4px; right: -4px; width: 16px; height: 16px; cursor: nwse-resize; }

/* === АДАПТИВ === */
@media (max-width: 768px) {
  .slide { padding: 60px 20px; }
  .slide-header h2 { font-size: 24px; }
  .main-title { font-size: 36px; }
  .subtitle { font-size: 18px; }
  .quiz-grid { grid-template-columns: 1fr; }
  .click-demo { flex-direction: column; align-items: center; }
  .launch-methods { grid-template-columns: 1fr; }
  .summary-grid { grid-template-columns: 1fr; }
  .cabinet-features { grid-template-columns: 1fr; }
  .annotation { display: none; }
  .nav-btn { width: 40px; height: 40px; font-size: 18px; }
  .nav-btn--prev { left: 10px; }
  .nav-btn--next { right: 10px; }
  .graduation-grid { grid-template-columns: 1fr; }
}