:root {
  --bg: #f6f8fb;
  --surface: #ffffff;
  --text: #1b2330;
  --muted: #6c7788;
  --primary: #1e40af;
  --primary-deep: #172554;
  --success: #12a150;
  --danger: #d13f3f;
  --radius: 12px;
  --space: 14px;
  --tg-button-text: #fff;
  --tg-viewport-stable-height: 100vh;
  --tg-main-button-reserve: 0px;
  --tabs-track-bg: #eceff4;
  --course-card-bg: var(--surface);
  --course-card-shadow: 0 10px 32px rgba(15, 23, 42, 0.08);
  --course-cta-glow: 0 6px 20px rgba(30, 64, 175, 0.28);
  --kb-safe-bottom: 0px;
  --keyboard-inset: 0px;
  /* смещение для position:fixed снизу: не «ездить» вместе с клавиатурой (visualViewport) */
  --vv-bottom-offset: 0px;
}

* { box-sizing: border-box; }
html {
  height: 100%;
  max-width: 100%;
  overflow-x: hidden;
  touch-action: manipulation;
  overscroll-behavior: none;
  -webkit-text-size-adjust: 100%;
}
body {
  margin: 0;
  min-height: 100%;
  max-width: 100%;
  overflow: hidden;
  overflow-x: hidden;
  font-family: Inter, "DM Sans", sans-serif;
  background: var(--bg);
  color: var(--text);
  touch-action: manipulation;
  overscroll-behavior: none;
  -webkit-text-size-adjust: 100%;
}

.app-wrapper {
  /* Базовая модель: колонка во всю высоту, скролл внутри контейнера. */
  min-height: 100dvh;
  height: var(--tg-viewport-stable-height, 100svh);
  min-height: max(100dvh, var(--tg-viewport-stable-height, 100svh));
  max-height: var(--tg-viewport-stable-height, 100svh);
  padding-top: env(safe-area-inset-top);
  padding-right: env(safe-area-inset-right);
  padding-bottom: calc(env(safe-area-inset-bottom) + var(--tg-main-button-reserve, 0px));
  padding-left: env(safe-area-inset-left);
  box-sizing: border-box;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  max-width: 100%;
}

.scrollable-content {
  flex: 1 1 auto;
  min-height: 0;
  min-width: 0;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  overscroll-behavior: contain;
}

.app {
  flex: 1 1 auto;
  min-height: 0;
  min-width: 0;
  width: 100%;
  max-width: 520px;
  margin: 0 auto;
  padding: var(--space);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.app > .card:not(.page-loader-card),
.app > .courses-shell,
.app > .completion-page {
  flex: 1 1 auto;
  min-height: 0;
  min-width: 0;
}

.app.view-enter > * {
  animation: pageFadeIn 220ms ease-out;
}
.card { background: var(--surface); border-radius: var(--radius); padding: 16px; box-shadow: 0 6px 20px rgba(0,0,0,.06); margin-bottom: 12px; }
.title { font-size: 20px; margin: 0 0 8px; }
.muted { color: var(--muted); font-size: 14px; }
.input, .button {
  width: 100%;
  border-radius: 10px;
  border: 1px solid #d8dfeb;
  padding: 12px;
  margin-top: 8px;
  font-size: 15px;
}
.input {
  -webkit-appearance: none;
  appearance: none;
  outline: none;
  transition: border-color 0.18s ease, box-shadow 0.18s ease;
  min-height: 44px;
  touch-action: manipulation;
}
.input:focus,
#textAnswer:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(30, 64, 175, 0.2);
}
.input:focus-visible,
#textAnswer:focus-visible,
.button:focus-visible {
  outline: 2px solid color-mix(in srgb, var(--primary) 70%, white 30%);
  outline-offset: 2px;
}
.input--error {
  border-color: var(--danger) !important;
  box-shadow: 0 0 0 3px rgba(209, 63, 63, 0.18) !important;
}
.input--success {
  border-color: var(--success) !important;
  box-shadow: 0 0 0 3px rgba(18, 161, 80, 0.18) !important;
}
.register-layout .scrollable-content > .muted {
  margin-bottom: 10px;
}
.register-field-wrap + .register-field-wrap {
  margin-top: 12px;
}
.register-field-wrap .input {
  margin-top: 0;
}
.register-field-error {
  margin: 6px 0 0;
  font-size: 12px;
  line-height: 1.35;
  color: var(--danger);
  min-height: 0;
}
.register-field-error[hidden] {
  display: none !important;
}

/* Регистрация: редизайн (Stitch / Nordic Azure, цвета проекта) */
.register-layout--stitch {
  padding: 22px 18px 20px;
  border-radius: 16px;
  box-shadow: var(--course-card-shadow);
  background: var(--surface);
  gap: 0;
}
.register-hero {
  margin-bottom: 22px;
  text-align: left;
}
.register-eyebrow {
  display: block;
  font-family: "Manrope", var(--font-sans, system-ui), sans-serif;
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--primary);
  margin: 0 0 10px;
}
.register-title {
  font-family: "Manrope", var(--font-sans, system-ui), sans-serif;
  font-size: clamp(26px, 7vw, 32px);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.03em;
  color: var(--text);
  margin: 0 0 8px;
}
.register-lead {
  margin: 0;
  font-size: 15px;
  line-height: 1.5;
  color: var(--muted);
}
.register-layout--stitch .scrollable-content {
  padding-bottom: calc(116px + env(safe-area-inset-bottom) + var(--kb-safe-bottom, 0px));
}
.register-layout--stitch .register-field-wrap + .register-field-wrap {
  margin-top: 22px;
}
.register-field-hint {
  margin: 8px 0 0;
  font-size: 12px;
  line-height: 1.4;
  color: var(--muted);
}

/* Поля регистрации: плавающая подпись — одна геометрия для пустого и заполненного состояния */
.floating-field {
  position: relative;
  padding-top: 0;
}
.floating-field .floating-label {
  position: absolute;
  left: 15px;
  top: 50%;
  z-index: 1;
  display: block;
  font-size: 16px;
  font-weight: 500;
  line-height: 1.25;
  letter-spacing: -0.01em;
  color: var(--muted);
  pointer-events: none;
  transform: translateY(-50%);
  transform-origin: left center;
  max-width: calc(100% - 28px);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  transition:
    top 0.22s cubic-bezier(0.4, 0, 0.2, 1),
    transform 0.22s cubic-bezier(0.4, 0, 0.2, 1),
    font-size 0.22s cubic-bezier(0.4, 0, 0.2, 1),
    font-weight 0.15s ease,
    color 0.18s ease;
}
.floating-field .input--floating {
  margin-top: 0;
  display: block;
  width: 100%;
  min-height: 56px;
  padding: 16px 14px;
  font-size: 17px;
  line-height: 1.35;
  border-radius: 14px;
  border: 1.5px solid rgba(100, 116, 139, 0.35);
  background: rgba(241, 245, 249, 0.95);
  color: var(--text);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.45);
  transition:
    border-color 0.2s ease,
    box-shadow 0.2s ease,
    background 0.2s ease,
    padding 0.22s cubic-bezier(0.4, 0, 0.2, 1);
  caret-color: var(--primary);
  -webkit-tap-highlight-color: transparent;
}
.floating-field .input--floating::placeholder {
  color: transparent;
}
.floating-field .register-select {
  appearance: none;
  -webkit-appearance: none;
  padding-right: 42px;
  background-image: none !important;
}
.floating-field#schoolClassWrap::after {
  content: "";
  position: absolute;
  right: 16px;
  top: 50%;
  width: 8px;
  height: 8px;
  border-right: 2px solid rgba(100, 116, 139, 0.95);
  border-bottom: 2px solid rgba(100, 116, 139, 0.95);
  transform: translateY(-65%) rotate(45deg);
  pointer-events: none;
  z-index: 2;
}
.floating-field .input--floating:focus {
  outline: none;
  border-color: rgba(30, 64, 175, 0.75);
  background: var(--surface);
  box-shadow:
    0 0 0 1px rgba(30, 64, 175, 0.28),
    0 6px 20px rgba(30, 64, 175, 0.1),
    inset 0 1px 0 rgba(255, 255, 255, 0.5);
}
.floating-field:focus-within .floating-label,
.floating-field .input--floating:not(:placeholder-shown) + .floating-label {
  top: 12px;
  font-size: 12px;
  font-weight: 600;
  color: var(--primary);
  transform: translateY(0) scale(0.86);
  transform-origin: left top;
}
.floating-field:focus-within .input--floating,
.floating-field .input--floating:not(:placeholder-shown) {
  padding-top: 22px;
  padding-bottom: 11px;
}
.floating-field.has-value .floating-label {
  top: 12px;
  font-size: 12px;
  font-weight: 600;
  color: var(--primary);
  transform: translateY(0) scale(0.86);
  transform-origin: left top;
}
.floating-field.has-value .input--floating {
  padding-top: 22px;
  padding-bottom: 11px;
}
.floating-field .input--floating.input--error {
  border-color: var(--danger);
  box-shadow:
    0 0 0 1px rgba(209, 63, 63, 0.35),
    0 4px 14px rgba(209, 63, 63, 0.08);
  background: rgba(254, 242, 242, 0.5);
}
.floating-field .input--floating.input--error:focus {
  border-color: var(--danger);
  box-shadow:
    0 0 0 1px rgba(209, 63, 63, 0.45),
    0 6px 18px rgba(209, 63, 63, 0.12);
}
.floating-field .input--floating.input--error + .floating-label {
  color: var(--danger);
}

.register-actions {
  margin-top: 28px;
  flex: 0 0 auto;
}

.register-actions--fixed {
  position: fixed;
  left: 50%;
  transform: translateX(-50%);
  width: min(520px, calc(100vw - 28px));
  bottom: calc(env(safe-area-inset-bottom) + 14px + var(--kb-safe-bottom, 0px));
  margin-top: 0;
  z-index: 30;
  transition: bottom 140ms ease-out;
}


.button {
  border: 0;
  background: var(--primary);
  color: var(--tg-button-text, #fff);
  cursor: pointer;
  font-weight: 600;
  transition: transform 120ms ease, box-shadow 160ms ease, opacity 120ms ease;
}
.button:hover {
  box-shadow: 0 6px 16px rgba(30, 64, 175, 0.26);
}
.button:active {
  transform: translateY(1px) scale(0.99);
}
.button:disabled {
  opacity: 0.8;
  cursor: not-allowed;
}
.button.secondary { background: #e2e8f4; color: #1e3a8a; }
.button.register-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 54px;
  font-family: "Manrope", var(--font-sans, system-ui), sans-serif;
  font-size: 17px;
  font-weight: 700;
  letter-spacing: -0.02em;
  border-radius: 14px;
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-deep) 100%);
  box-shadow: 0 10px 28px rgba(30, 64, 175, 0.35);
}
.button.register-cta:hover {
  box-shadow: 0 12px 32px rgba(30, 64, 175, 0.42);
}
.button.register-cta .register-cta__arrow {
  font-size: 1.15em;
  line-height: 1;
  opacity: 0.95;
}
.button.is-loading {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}
.btn-spinner {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  border: 2px solid rgba(255, 255, 255, 0.45);
  border-top-color: #fff;
  animation: spin 0.8s linear infinite;
}
/* Курсы: сегментированные табы (Stitch / M3) */
.tabs.tabs-track {
  display: flex;
  gap: 4px;
  align-items: stretch;
  margin-bottom: 18px;
  position: relative;
  width: 100%;
  max-width: 100%;
  min-width: 0;
  box-sizing: border-box;
  padding: 4px;
  border-radius: 999px;
  background: var(--tabs-track-bg);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.06);
}
.tabs-track .tab {
  flex: 1 1 0;
  min-width: 0;
  padding: 8px 10px;
  border: 0;
  border-radius: 999px;
  background: transparent;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  color: var(--text);
  transition: background 180ms ease, color 180ms ease, box-shadow 180ms ease, transform 120ms ease;
  box-shadow: none;
  -webkit-tap-highlight-color: transparent;
}
.tabs-track .tab:hover {
  transform: none;
}
.tabs-track .tab:active {
  transform: scale(0.98);
}
.tabs-track .tab-label {
  font-weight: 600;
  min-width: 0;
  flex: 0 1 auto;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  text-align: center;
  font-size: 12px;
  line-height: 1.25;
}
.tabs-track .tab-count {
  flex-shrink: 0;
  min-width: 22px;
  padding: 3px 7px;
  border-radius: 999px;
  background: rgba(27, 35, 48, 0.1);
  color: inherit;
  font-size: 11px;
  font-weight: 700;
  text-align: center;
  line-height: 1.15;
  box-sizing: border-box;
}
.tabs-track .tab.active {
  background: var(--primary);
  color: var(--tg-button-text, #fff);
  font-weight: 600;
  box-shadow: var(--course-cta-glow);
}
.tabs-track .tab.active .tab-count {
  background: rgba(255, 255, 255, 0.22);
  color: inherit;
}
.tabs-track .tab:not(.active) {
  opacity: 0.92;
}
.courses-shell {
  display: flex;
  flex-direction: column;
  flex: 1 1 auto;
  min-height: 0;
  min-width: 0;
}

.courses-page-title {
  flex: 0 0 auto;
  width: 100%;
  text-align: center;
  font-family: "Plus Jakarta Sans", Inter, "DM Sans", sans-serif;
  font-size: clamp(26px, 6.5vw, 30px);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.15;
  margin: 0 0 18px;
}

.courses-panel-empty {
  text-align: center;
  margin: 24px 0;
  padding: 12px 8px;
  font-size: 15px;
  line-height: 1.45;
  opacity: 0.88;
}

.course-card {
  background: var(--course-card-bg);
  border-radius: 16px;
  padding: 18px;
  margin-bottom: 14px;
  box-shadow: var(--course-card-shadow);
  border: 1px solid var(--course-card-outline, rgba(15, 23, 42, 0.06));
}

.course-card__top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 10px;
}

.course-card__phase {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
  line-height: 1.35;
  padding-top: 2px;
}

.course-card__badge {
  flex-shrink: 0;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  padding: 5px 10px;
  border-radius: 999px;
  line-height: 1;
}

.course-card__badge--done {
  background: rgba(34, 197, 94, 0.18);
  color: #15803d;
}

.course-card__badge--active {
  background: rgba(37, 99, 235, 0.2);
  color: var(--primary);
}

.course-card__badge--new {
  background: rgba(100, 116, 139, 0.2);
  color: var(--muted);
}

.course-card__title {
  font-family: "Plus Jakarta Sans", Inter, "DM Sans", sans-serif;
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.3;
  margin: 0 0 12px;
}

.course-card__progress-block {
  margin: 0;
}

.course-card__progress-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 8px;
}

.course-card__progress-caption {
  font-size: 13px;
  line-height: 1.35;
  color: var(--muted);
}

.course-card__progress-pct {
  font-size: 13px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: var(--text);
  flex-shrink: 0;
}

.course-card__track {
  height: 7px;
  border-radius: 999px;
  background: rgba(15, 23, 42, 0.08);
  overflow: hidden;
}

.course-card__fill {
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--primary) 0%, var(--primary-deep) 100%);
  transition: width 0.35s ease;
  min-width: 0;
}

.course-card__cta {
  margin-top: 18px;
  border-radius: 12px;
  font-weight: 600;
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-deep) 100%);
  box-shadow: var(--course-cta-glow);
}
.course-card__cta:hover {
  box-shadow: 0 8px 24px rgba(30, 64, 175, 0.34);
}

.courses-shell > .tabs {
  flex: 0 0 auto;
}

.courses-reel-viewport {
  width: 100%;
  flex: 1 1 auto;
  min-height: 0;
  overflow: hidden;
}
.courses-reel {
  width: 300%;
  display: flex;
  height: 100%;
  transition: transform 520ms cubic-bezier(.18,1.14,.5,1.02);
  will-change: transform;
}
.courses-panel {
  width: 33.3333%;
  height: 100%;
  padding-right: 2px;
  padding-bottom: 2px;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  overscroll-behavior: contain;
}
.courses-panel .card {
  animation: tabContentIn 260ms ease-out both;
}
.courses-panel.is-loading .course-card--skeleton {
  animation: tabContentIn 180ms ease-out both;
}
.course-card--skeleton {
  pointer-events: none;
}
.course-card--skeleton .skeleton-line {
  margin-top: 12px;
}
.option { display: block; background: #f4f6fa; border-radius: 12px; padding: 12px; margin-top: 8px; border: 1px solid transparent; min-height: 48px; transition: border-color 140ms ease, background 140ms ease, box-shadow 140ms ease; }
.option { display: flex; align-items: center; gap: 10px; color: #1b2330; }
.option input { flex: 0 0 auto; }
.option:hover {
  border-color: rgba(30, 64, 175, 0.22);
}
.option.is-selected {
  border-color: rgba(30, 64, 175, 0.6);
  background: rgba(30, 64, 175, 0.1);
  box-shadow: 0 0 0 1px rgba(30, 64, 175, 0.28);
}
.option.option--correct {
  border-color: rgba(18, 161, 80, 0.7);
  background: rgba(18, 161, 80, 0.14);
  box-shadow: 0 0 0 1px rgba(18, 161, 80, 0.3);
}
.option.option--wrong {
  border-color: rgba(209, 63, 63, 0.72);
  background: rgba(209, 63, 63, 0.12);
  box-shadow: 0 0 0 1px rgba(209, 63, 63, 0.3);
}
.option-text { color: inherit; }
.question-image {
  width: 100%;
  max-height: 260px;
  object-fit: contain;
  border-radius: 10px;
  margin-top: 10px;
  background: #eef2f8;
}
.overlay { border-left: 4px solid var(--primary); }
.overlay {
  overflow: hidden;
  word-break: break-word;
}
.explanation-content {
  color: var(--text);
  font-size: 16px;
  line-height: 1.45;
}
.explanation-content p {
  margin: 8px 0;
}
.explanation-content img {
  max-width: 100%;
  height: auto;
  border-radius: 8px;
}
.explanation-image {
  margin-bottom: 10px;
}
.explanation-image-wrap {
  position: relative;
  margin-bottom: 10px;
  border-radius: 10px;
  overflow: hidden;
}
.explanation-image-wrap .explanation-image {
  margin-bottom: 0;
  transition: opacity 220ms ease;
}
.explanation-image-preview {
  position: absolute;
  inset: 10px 0 0 0;
  background-size: cover;
  background-position: center;
  filter: blur(16px) saturate(0.9);
  transform: scale(1.04);
  opacity: 0;
  transition: opacity 220ms ease;
}
.explanation-image-loader {
  position: absolute;
  inset: 10px 0 0 0;
  border-radius: 10px;
  background: linear-gradient(90deg, rgba(140, 156, 178, 0.16), rgba(140, 156, 178, 0.34), rgba(140, 156, 178, 0.16));
  background-size: 220% 100%;
  animation: shimmer 1.2s linear infinite;
  display: none;
  align-items: center;
  justify-content: center;
  gap: 8px;
  color: var(--muted);
  font-size: 14px;
}
.explanation-image-wrap.is-loading .explanation-image-loader {
  display: flex;
}
.explanation-image-wrap.is-loading .explanation-image {
  opacity: 0;
}
.explanation-image-wrap.is-loading .explanation-image-preview {
  opacity: 0.95;
}
.explanation-image-wrap.is-loaded .explanation-image {
  animation: imageFadeIn 240ms ease-out;
}
.explanation-image-wrap.is-loaded .explanation-image-preview {
  opacity: 0;
}
.ok { color: var(--success); }
.bad { color: var(--danger); }

.task-inline-result {
  margin-top: 14px;
}

.task-inline-result-title {
  margin: 0 0 10px;
}

.task-inline-result-badge {
  display: inline-flex;
  align-items: center;
  margin: 0 0 10px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  line-height: 1;
  padding: 5px 10px;
  border-radius: 999px;
  background: rgba(37, 99, 235, 0.2);
  color: var(--primary);
}

.task-inline-result-body {
  display: block;
}

.task-layout {
  display: flex;
  flex-direction: column;
  flex: 1 1 auto;
  min-height: 0;
  margin-bottom: 0;
  overflow: hidden;
}

/* Как регистрация: кнопка не в потоке flex — клавиатура не подталкивает её вверх вместе с колонкой */
.task-layout--fixed {
  height: 100%;
  position: relative;
}

.task-layout--fixed .scrollable-content {
  padding-bottom: calc(100px + env(safe-area-inset-bottom) + var(--tg-main-button-reserve, 0px) + var(--kb-safe-bottom, 0px));
  padding-right: 10px;
  scrollbar-gutter: stable;
}

.task-actions--fixed {
  position: fixed;
  left: 50%;
  transform: translateX(-50%);
  width: min(520px, calc(100vw - 28px));
  bottom: calc(
    env(safe-area-inset-bottom) + 14px + var(--tg-main-button-reserve, 0px) + var(--kb-safe-bottom, 0px)
  );
  margin: 0;
  padding: 0;
  z-index: 25;
  box-sizing: border-box;
  transition: none;
}

.task-actions--fixed .task-footer-btn {
  margin-top: 0;
}

.task-footer-btn {
  flex: 0 0 auto;
  margin-top: 12px;
}

.task-footer-btn:disabled {
  opacity: 0.55;
  box-shadow: none !important;
}

.task-answer-error {
  margin: 8px 2px 0;
  font-size: 12px;
  line-height: 1.35;
  color: var(--danger);
}

.task-correct-answer {
  margin: 8px 2px 0;
  font-size: 15px;
  line-height: 1.35;
  color: var(--danger);
  font-weight: 700;
}

.task-correct-answer span {
  font-weight: 700;
}

.task-answer-error[hidden] {
  display: none !important;
}

.task-question {
  overflow-wrap: anywhere;
  word-break: break-word;
}

/* Регистрация: клавиатура накладывается поверх (см. viewport interactive-widget=overlays-content),
   поля прокручиваются в .scrollable-content, кнопка не «подпрыгивает» вверх вместе с клавиатурой */
.register-layout {
  display: flex;
  flex-direction: column;
  flex: 1 1 auto;
  min-height: 0;
  height: 100%;
  overflow: hidden;
}

.register-layout .scrollable-content {
  flex: 1 1 auto;
  min-height: 0;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  overscroll-behavior: contain;
}

.register-layout .register-actions .button,
.register-layout > .button {
  flex: 0 0 auto;
  margin-top: 0;
  position: relative;
  z-index: 1;
}
.register-layout > .button {
  margin-top: 12px;
}

.completion-page {
  display: flex;
  flex-direction: column;
  gap: 14px;
  flex: 1 1 auto;
  min-height: 0;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  overscroll-behavior: contain;
}

.completion-icon-wrap {
  width: 104px;
  height: 104px;
  margin: 6px auto 2px;
  border-radius: 28px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.06);
  display: flex;
  align-items: center;
  justify-content: center;
}

.completion-icon {
  font-size: 46px;
  line-height: 1;
}

.completion-title {
  margin: 0;
  text-align: center;
  font-size: 38px;
  line-height: 1.1;
  font-weight: 800;
}

.completion-subtitle {
  margin: 0;
  text-align: center;
  color: var(--muted);
  font-size: 16px;
  line-height: 1.4;
}

.completion-progress-card {
  position: relative;
  background: linear-gradient(135deg, #1d4ed8 0%, #1e3a8a 100%);
  border-radius: 20px;
  padding: 18px 16px 16px;
  overflow: hidden;
  box-shadow: 0 8px 20px rgba(31, 91, 212, 0.35);
}

.completion-progress-card::after {
  content: "";
  position: absolute;
  right: -22px;
  top: -32px;
  width: 136px;
  height: 136px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.12);
}

.completion-progress-label {
  margin: 0 0 6px;
  font-size: 24px;
  font-weight: 700;
  color: #ffffff;
}

.completion-progress-value {
  margin: 0 0 12px;
  font-size: 56px;
  line-height: 1;
  font-weight: 800;
  color: #ffffff;
}

.completion-progress-track {
  width: 100%;
  height: 10px;
  border-radius: 99px;
  background: rgba(255, 255, 255, 0.2);
  position: relative;
  z-index: 1;
}

.completion-progress-fill {
  height: 100%;
  border-radius: inherit;
  background: #ffffff;
}

.completion-stats-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.completion-stat-card {
  border-radius: 16px;
  padding: 14px;
}

.completion-stat-total {
  grid-row: span 2;
  background: #edf1f7;
}

.completion-stat-good {
  background: #e6f8ef;
}

.completion-stat-bad {
  background: #fbeef1;
}

.completion-stat-label {
  margin: 0 0 8px;
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.4px;
  font-weight: 700;
  color: #6d7a90;
}

.completion-stat-value {
  margin: 0;
  font-size: 42px;
  line-height: 1;
  font-weight: 800;
  color: #1d2738;
}

.completion-stat-good .completion-stat-value {
  font-size: 38px;
  color: #159252;
}

.completion-stat-bad .completion-stat-value {
  font-size: 38px;
  color: #c13b55;
}

.completion-close-btn {
  margin-top: 8px;
  border-radius: 14px;
  font-size: 22px;
  font-weight: 700;
  padding: 14px;
}

.page-loader-card {
  min-height: 140px;
}

.skeleton-line {
  height: 12px;
  border-radius: 999px;
  margin-top: 10px;
  background: linear-gradient(90deg, rgba(140, 156, 178, 0.16), rgba(140, 156, 178, 0.34), rgba(140, 156, 178, 0.16));
  background-size: 220% 100%;
  animation: shimmer 1.2s linear infinite;
}

.skeleton-line.w-80 { width: 80%; }
.skeleton-line.w-60 { width: 60%; }

.fade-in-up {
  animation: cardUp 220ms ease-out;
}

body.theme-dark {
  --bg: #0f1419;
  --surface: #1b2025;
  --text: #dee3ea;
  --muted: #a0acbf;
  --primary: #1d4ed8;
  --primary-deep: #1e3a8a;
  --tabs-track-bg: #171c21;
  --course-card-bg: #1a2230;
  --course-card-outline: rgba(255, 255, 255, 0.06);
  --course-card-shadow: 0 16px 40px rgba(0, 0, 0, 0.38);
  --course-cta-glow: 0 6px 22px rgba(29, 78, 216, 0.32);
}
body.theme-dark .input,
body.theme-dark #textAnswer {
  background: #2a3242;
  border-color: #3b465c;
  color: #eef2f8;
}
body.theme-dark .input:focus,
body.theme-dark #textAnswer:focus {
  border-color: #60a5fa;
  box-shadow: 0 0 0 3px rgba(96, 165, 250, 0.28);
}
body.theme-dark .input--error {
  border-color: #f87171 !important;
  box-shadow: 0 0 0 3px rgba(248, 113, 113, 0.22) !important;
}
body.theme-dark .input--success {
  border-color: #4ade80 !important;
  box-shadow: 0 0 0 3px rgba(74, 222, 128, 0.24) !important;
}
body.theme-dark .register-layout--stitch {
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.38);
}
body.theme-dark .register-eyebrow {
  color: #93c5fd;
}
body.theme-dark .floating-field .input--floating {
  border-color: rgba(148, 163, 184, 0.28);
  background: #232b38;
  color: #f1f5f9;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.05);
  caret-color: #93c5fd;
}
body.theme-dark .floating-field#schoolClassWrap::after {
  border-right-color: rgba(191, 219, 254, 0.95);
  border-bottom-color: rgba(191, 219, 254, 0.95);
}
body.theme-dark .floating-field .input--floating:focus {
  border-color: #60a5fa;
  background: #2a3242;
  box-shadow:
    0 0 0 1px rgba(96, 165, 250, 0.55),
    0 8px 24px rgba(0, 0, 0, 0.35),
    inset 0 1px 0 rgba(255, 255, 255, 0.06);
}
body.theme-dark .floating-field .input--floating.input--error {
  background: rgba(127, 29, 29, 0.25);
  border-color: #f87171;
  box-shadow:
    0 0 0 1px rgba(248, 113, 113, 0.45),
    0 4px 16px rgba(0, 0, 0, 0.2);
}
body.theme-dark .floating-field .input--floating.input--error:focus {
  border-color: #f87171;
  box-shadow:
    0 0 0 1px rgba(248, 113, 113, 0.5),
    0 6px 20px rgba(0, 0, 0, 0.28),
    inset 0 1px 0 rgba(255, 255, 255, 0.04);
}
body.theme-dark .floating-field:focus-within .floating-label,
body.theme-dark .floating-field .input--floating:not(:placeholder-shown) + .floating-label {
  color: #bfdbfe;
}
body.theme-dark .floating-field.has-value .floating-label {
  color: #bfdbfe;
}
body.theme-dark .floating-field .input--floating.input--error + .floating-label {
  color: #fca5a5;
}
body.theme-dark .button.register-cta {
  box-shadow: 0 10px 32px rgba(29, 78, 216, 0.38);
}
body.theme-dark .option {
  background: #2a3242;
  color: #eef2f8;
}
body.theme-dark .option:hover {
  border-color: rgba(147, 197, 253, 0.35);
}
body.theme-dark .option.is-selected {
  border-color: rgba(147, 197, 253, 0.65);
  background: rgba(59, 130, 246, 0.18);
  box-shadow: 0 0 0 1px rgba(147, 197, 253, 0.3);
}
body.theme-dark .option.option--correct {
  border-color: rgba(74, 222, 128, 0.85);
  background: rgba(34, 197, 94, 0.22);
  box-shadow: 0 0 0 1px rgba(74, 222, 128, 0.35);
}
body.theme-dark .option.option--wrong {
  border-color: rgba(248, 113, 113, 0.9);
  background: rgba(239, 68, 68, 0.2);
  box-shadow: 0 0 0 1px rgba(248, 113, 113, 0.35);
}
body.theme-dark .task-inline-result-badge {
  background: rgba(59, 130, 246, 0.22);
  color: #93c5fd;
}
body.theme-dark .button.secondary {
  background: #2a364f;
  color: #93c5fd;
}
body.theme-dark .tabs-track .tab:not(.active) {
  color: #c2c6d6;
  opacity: 1;
}
body.theme-dark .tabs-track .tab:not(.active) .tab-count {
  background: rgba(255, 255, 255, 0.1);
  color: #dee3ea;
}
body.theme-dark .course-card__track {
  background: rgba(255, 255, 255, 0.08);
}
body.theme-dark .course-card__badge--done {
  background: rgba(34, 197, 94, 0.2);
  color: #4ade80;
}
body.theme-dark .course-card__badge--active {
  background: rgba(59, 130, 246, 0.22);
  color: #93c5fd;
}
body.theme-dark .course-card__badge--new {
  background: rgba(148, 163, 184, 0.16);
  color: #94a3b8;
}
body.theme-dark .question-image {
  background: #2a3242;
}
body.theme-dark .explanation-content {
  color: #eef2f8;
}
body.theme-dark .skeleton-line {
  background: linear-gradient(90deg, rgba(111, 130, 160, 0.2), rgba(111, 130, 160, 0.4), rgba(111, 130, 160, 0.2));
  background-size: 220% 100%;
}
body.theme-dark .explanation-image-loader {
  background: linear-gradient(90deg, rgba(111, 130, 160, 0.2), rgba(111, 130, 160, 0.4), rgba(111, 130, 160, 0.2));
  background-size: 220% 100%;
}
body.theme-dark .completion-icon-wrap {
  background: rgba(255, 255, 255, 0.03);
  border-color: rgba(255, 255, 255, 0.05);
}

body.theme-dark .completion-stat-total {
  background: #1f2a3b;
}

body.theme-dark .completion-stat-good {
  background: #1b3440;
}

body.theme-dark .completion-stat-bad {
  background: #372533;
}

body.theme-dark .completion-stat-label {
  color: #a5b0c1;
}

body.theme-dark .completion-stat-total .completion-stat-value {
  color: #f0f5ff;
}

@media (max-width: 420px) {
  .tabs-track {
    gap: 2px;
    padding: 3px;
  }
  .tabs-track .tab {
    padding: 7px 6px;
    gap: 5px;
  }
  .tabs-track .tab-label {
    font-size: 11px;
  }
  .tabs-track .tab-count {
    font-size: 10px;
    min-width: 18px;
    padding: 2px 4px;
  }

  .completion-title {
    font-size: 34px;
  }

  .completion-progress-label {
    font-size: 22px;
  }

  .completion-progress-value {
    font-size: 50px;
  }

  .completion-stat-value {
    font-size: 38px;
  }

  .completion-stat-good .completion-stat-value,
  .completion-stat-bad .completion-stat-value {
    font-size: 32px;
  }

  .completion-close-btn {
    font-size: 20px;
  }
}

@keyframes pageFadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes cardUp {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

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

@keyframes shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -20% 0; }
}

@keyframes imageFadeIn {
  from { opacity: 0; transform: translateY(4px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes tabContentIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}