/* ===================================
   MindWorld School - Addition & Subtraction Trainer
   Version: 14.3 (Header on top, new language capsule, centered UI)
   =================================== */

:root {
  --orange: #EC8D00;
  --coral: #E8654B;
  --ivory: #FDF8F3;
  --green: #2e7d32;
  --red: #c62828;
  --text: #333;
  --shadow: 0 6px 24px rgba(0,0,0,.12);
  --board-top: 7.5%;
  --board-right: calc(4.5% + 10px);
  --board-width: 50%;
  --board-height: 45%;
}

* { box-sizing: border-box; }

html, body { height: 100%; margin: 0; }

body {
  font-family: Inter, system-ui, 'Segoe UI', Arial, sans-serif;
  color: var(--text);
  background: linear-gradient(180deg, var(--orange), var(--coral));
  opacity: 0;
  animation: fadeIn 1s ease-in forwards;
}

@keyframes fadeIn { to { opacity: 1; } }

.app {
  min-height: 100%;
  display: flex;
  flex-direction: column;
}

/* ===================================
   Topbar (всегда сверху)
   =================================== */
.topbar {
  position: sticky;
  top: 0;
  z-index: 10050; /* выше результатов и конфетти */
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  background: linear-gradient(180deg, #EC8D00 0%, #E8654B 100%);
}

.topbar__left { justify-self: start; }

.topbar__title {
  justify-self: center;
  color: #fff;
  font-size: clamp(18px, 3.5vw, 28px);
  margin: 0;
  text-align: center;
  text-shadow: 2px 2px 4px rgba(0,0,0,0.25);
}

.topbar__right { justify-self: end; }

.logo {
  width: 48px;
  height: 48px;
  display: block;
  filter: drop-shadow(0 2px 4px rgba(0,0,0,0.25));
}

/* ===================================
   Language Switcher (новая капсула)
   =================================== */
.lang-capsule {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 6px;
  border-radius: 999px;
  border: 2px solid rgba(255,255,255,.65);
  background: transparent;
  box-shadow: 0 2px 10px rgba(0,0,0,.08) inset;
  backdrop-filter: saturate(1.05);
}

.lang-btn {
  border: 0;
  background: transparent;
  padding: 8px 14px;
  border-radius: 999px;
  cursor: pointer;
  font-weight: 700;
  letter-spacing: .02em;
  color: #fff;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 44px;
  transition: transform .15s ease, background-color .15s ease, color .15s ease;
}

.lang-btn:hover { transform: translateY(-1px); }

.lang-btn.active {
  background: #fff;
  color: var(--orange);
  box-shadow: 0 4px 16px rgba(0,0,0,.18);
}

/* ===================================
   Content & Panels
   =================================== */
.content {
  width: min(1100px, 95%);
  margin: 16px auto 32px;
  flex: 1;
}

.panel {
  background: rgba(255, 255, 255, .95);
  border-radius: 20px;
  box-shadow: var(--shadow);
  padding: 24px;
}

/* ===================================
   Settings Grid (Adaptive)
   =================================== */
.settings-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
  align-items: end;
  text-align: center; /* центрируем подписи и поля */
}

@media (max-width: 768px) { .settings-grid { grid-template-columns: 1fr; } }

.field { display: flex; flex-direction: column; gap: 8px; }

.field label {
  font-weight: 600;
  font-size: 14px;
  color: var(--text);
  text-align: center; /* подписи по центру */
}

/* Поля + центр отображаемого значения */
select, .input {
  padding: 12px 14px;
  border-radius: 12px;
  border: 1px solid #ddd;
  background: #fff;
  font-size: 16px;
  transition: border-color 0.3s ease;
  text-align: center;
  text-align-last: center; /* центр текста в select (Chrome/Edge) */
}

select:focus, .input:focus { outline: none; border-color: var(--orange); }

/* ===================================
   Buttons
   =================================== */
.btn {
  padding: 12px 20px;
  border-radius: 12px;
  border: 0;
  background: var(--orange);
  color: #fff;
  cursor: pointer;
  box-shadow: var(--shadow);
  font-weight: 600;
  font-size: 16px;
  transition: all 0.2s ease;
  display: inline-flex;             /* центрируем содержимое кнопок */
  align-items: center;
  justify-content: center;
  text-align: center;
}

.btn:hover { transform: translateY(-2px); box-shadow: 0 8px 28px rgba(0,0,0,.18); }
.btn:active { transform: translateY(1px); }
.btn.primary { background: var(--green); }

.btn.ghost {
  background: #fff;
  color: var(--text);
  border: 1px solid #ddd;
}

.actions { display: flex; align-items: end; justify-content: center; }

@media (max-width: 768px) {
  .actions { grid-column: 1; }
  .actions .btn { width: 100%; }
}

/* ===================================
   Game Screen
   =================================== */
.game-screen {
  margin: 8px auto 16px;
  width: 100%;
  aspect-ratio: 16/9;
  background-image: 
    url('../assets/img/screen-bg.png'),
    url('../assets/img/screen-bg.jpg'),
    url('../assets/img/screen-bg.jpeg'),
    linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  background-position: center;
  background-size: cover;
  background-repeat: no-repeat;
  border-radius: 16px;
  box-shadow: var(--shadow);
  position: relative;
  overflow: hidden;
}

.board {
  position: absolute;
  right: var(--board-right);
  top: var(--board-top);
  width: var(--board-width);
  height: var(--board-height);
  background: #fff3e6 !important;
  border-radius: 16px;
  box-shadow: inset 0 0 0 4px rgba(255, 124, 0, 0.25), 0 6px 18px rgba(0,0,0,0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 12px;
  transition: background 0.3s ease;
  text-align: center; /* подстраховка */
}

/* Auto-expand board for long answers */
.board.expanded {
  width: calc(var(--board-width) + 10%);
  right: calc(var(--board-right) - 5%);
}

/* Board feedback colors */
.board.correct { background-color: #d4edda !important; transition: background-color .3s ease; }
.board.wrong   { background-color: #f8d7da !important; transition: background-color .3s ease; }

.task {
  font-size: clamp(34px, 6.2vw, 84px);
  font-weight: 800;
  color: #2b2b2b;
  line-height: 1.1;
  text-align: center;
  white-space: nowrap;
  overflow: visible;
}

.task-anim { animation: popIn .22s ease-out both; }

@keyframes popIn {
  0% { opacity: 0; transform: scale(.96); }
  100% { opacity: 1; transform: scale(1); }
}

/* ===================================
   Answer Buttons
   =================================== */
.answers {
  margin-top: 12px;
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  justify-content: center;
}

.answer-btn {
  min-width: 120px;
  padding: 14px 16px;
  border-radius: 14px;
  border: 0;
  background: #fff;
  box-shadow: var(--shadow);
  cursor: pointer;
  font-size: 20px;
  font-weight: 600;
  transition: all 0.2s ease;
  display: inline-flex;      /* центрирование текста */
  align-items: center;
  justify-content: center;
  text-align: center;
}

.answer-btn:hover { transform: translateY(-2px); box-shadow: 0 8px 28px rgba(0,0,0,.18); }
.answer-btn:active { transform: scale(.98); }

/* ===================================
   Input Mode (shown when mode = input)
   =================================== */
.input-wrap {
  display: none;
  gap: 10px;
  justify-content: center;
  margin-top: 12px;
}

.input-wrap:not([hidden]) { display: flex; }

@media (max-width: 480px) {
  .input-wrap:not([hidden]) {
    flex-direction: column;
    align-items: stretch;
  }
}

/* ===================================
   Toolbar
   =================================== */
.toolbar {
  margin-top: 12px;
  display: flex;
  gap: 10px;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
}

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

.btn-sound {
  min-width: 48px;
  padding: 12px;
  font-size: 20px;
  background: #fff;
  color: var(--text);
  border: 1px solid #ddd;
}

.btn-sound.muted { opacity: 0.5; }

@media (max-width: 768px) {
  .toolbar { flex-direction: column; align-items: stretch; }
  .toolbar__left { width: 100%; }
  .toolbar > * { width: 100%; justify-content: center; }
}

.stats {
  display: flex;
  gap: 12px;
  align-items: center;
  flex-wrap: wrap;
  justify-content: center; /* центрируем блок статистики */
}

/* ===================================
   Toast Notifications
   =================================== */
.toast {
  position: fixed;
  left: 50%;
  bottom: 18px;
  transform: translateX(-50%) scale(0.98);
  background: #fff;
  border-left: 8px solid var(--green);
  padding: 12px 16px;
  border-radius: 12px;
  box-shadow: var(--shadow);
  opacity: 0;
  pointer-events: none;
  transition: .25s;
  z-index: 1000;
}

.toast.error { border-left-color: var(--red); }
.toast.show  { opacity: 1; transform: translateX(-50%) scale(1); }

/* ===================================
   Accessibility
   =================================== */
.visually-hidden {
  position: absolute !important;
  height: 1px; width: 1px;
  overflow: hidden;
  clip: rect(1px, 1px, 1px, 1px);
  white-space: nowrap;
}

/* ===================================
   Confetti canvas
   =================================== */
.confetti-canvas {
  position: fixed;
  inset: 0;
  width: 100vw;
  height: 100vh;
  display: none;
  pointer-events: none;
  z-index: 9000;  /* ниже шапки (10050) и чуть ниже оверлея результатов */
}

/* Оверлей результатов добавляет отступ под шапку */
.results-padding-top { padding-top: 88px !important; }

/* ===================================
   Responsive Board Positioning
   =================================== */
@media (min-width: 1025px) {
  :root {
    --board-top: 7.5%;
    --board-right: calc(4.5% + 10px);
    --board-width: 50%;
    --board-height: 45%;
  }
}

@media (min-width: 641px) and (max-width: 1024px) {
  :root {
    --board-top: 8.5%;
    --board-right: calc(5.5% + 10px);
    --board-width: 55%;
    --board-height: 50%;
  }
}

@media (max-width: 640px) {
  :root {
    --board-top: 9.5%;
    --board-right: calc(6% + 10px);
    --board-width: 60%;
    --board-height: 55%;
  }
  .task { font-size: clamp(28px, 7.2vw, 64px); }
  .panel { padding: 16px; }
}