/* ========================================
   Румынский тренажёр - Основные стили
   ======================================== */

/* Переменные CSS */
:root {
  --color-bg: #F8FAFC;
  --color-bg-white: #FFFFFF;
  --color-text: #334155;
  --color-text-dark: #0F172A;
  --color-text-muted: #64748B;
  --color-primary: #3B82F6;
  --color-primary-hover: #2563EB;
  --color-success: #10B981;
  --color-success-bg: #D1FAE5;
  --color-warning-bg: #FEF3C7;
  --color-phonetics-bg: linear-gradient(135deg, #ECFDF5 0%, #F0FDFA 100%);
  --color-phonetics-header: #D1FAE5;
  --color-border: #E5E7EB;
  --color-input-border: #D1D5DB;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --transition: 0.3s ease;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
}

/* Заголовок страницы */
.header {
  background: var(--color-text-dark);
  color: var(--color-bg-white);
  padding: 20px 30px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 15px;
}

.header h1 {
  font-size: 1.8rem;
  font-weight: 700;
}

.btn-clear {
  background: #EF4444;
  color: white;
  border: none;
  padding: 10px 20px;
  border-radius: var(--radius-md);
  cursor: pointer;
  font-size: 0.95rem;
  font-weight: 600;
  transition: background var(--transition);
}

.btn-clear:hover {
  background: #DC2626;
}

/* Навигация */
.navigation {
  background: var(--color-bg-white);
  padding: 15px 30px;
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: 0;
  z-index: 100;
}

.nav-tab {
  background: transparent;
  border: 2px solid transparent;
  padding: 12px 24px;
  border-radius: var(--radius-md);
  cursor: pointer;
  font-size: 1rem;
  font-weight: 500;
  color: var(--color-text);
  transition: all var(--transition);
}

.nav-tab:hover {
  background: var(--color-bg);
  color: var(--color-primary);
}

.nav-tab.active {
  background: var(--color-primary);
  color: white;
}

/* Контейнер */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 30px 20px;
}

/* Скрытие блоков */
.hidden {
  display: none !important;
}

/* ========================================
   Фонетика
   ======================================== */
.phonetics {
  background: var(--color-phonetics-bg);
  padding: 30px;
  border-radius: var(--radius-lg);
  margin-bottom: 30px;
  border-left: 5px solid var(--color-success);
  box-shadow: var(--shadow-md);
}

.phonetics h2 {
  color: var(--color-text-dark);
  margin-bottom: 15px;
  font-size: 1.6rem;
}

.phonetics-intro {
  color: var(--color-text);
  margin-bottom: 25px;
  font-size: 1.05rem;
}

.phonetics h3 {
  color: var(--color-text-dark);
  margin: 30px 0 15px;
  font-size: 1.3rem;
}

/* Фонетика внутри блока 0 */
.phonetics-extra {
  background: var(--color-phonetics-bg);
  padding: 25px;
  border-radius: var(--radius-lg);
  margin-top: 30px;
  border-left: 5px solid var(--color-success);
}

.phonetics-extra h3 {
  color: var(--color-text-dark);
  margin: 25px 0 15px;
  font-size: 1.3rem;
}

.phonetics-extra h3:first-child {
  margin-top: 0;
}

/* Таблицы фонетики */
.phonetics-table,
.rules-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--color-bg-white);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.phonetics-table th,
.rules-table th {
  background: var(--color-phonetics-header);
  color: var(--color-text-dark);
  font-weight: 600;
  padding: 14px 12px;
  text-align: left;
  border-bottom: 2px solid var(--color-success);
}

.phonetics-table td,
.rules-table td {
  padding: 12px;
  border-bottom: 1px solid var(--color-border);
  vertical-align: top;
}

.phonetics-table tr:last-child td,
.rules-table tr:last-child td {
  border-bottom: none;
}

.phonetics-table tr:hover,
.rules-table tr:hover {
  background: var(--color-bg);
}

/* Транскрипция */
.transcription {
  font-style: italic;
  color: var(--color-text-muted);
  font-size: 0.9em;
  margin-left: 6px;
}

/* ========================================
   Блоки контента
   ======================================== */
.block {
  background: var(--color-bg-white);
  border-radius: var(--radius-lg);
  padding: 30px;
  margin-bottom: 30px;
  box-shadow: var(--shadow-md);
}

.block h2 {
  color: var(--color-text-dark);
  font-size: 1.6rem;
  margin-bottom: 25px;
  padding-bottom: 15px;
  border-bottom: 3px solid var(--color-primary);
}

.block h3 {
  color: var(--color-text-dark);
  font-size: 1.25rem;
  margin: 25px 0 15px;
}

/* Теория */
.theory {
  background: var(--color-warning-bg);
  padding: 25px;
  border-radius: var(--radius-md);
  margin-bottom: 25px;
  border-left: 4px solid #F59E0B;
}

.theory-content {
  font-size: 1.05rem;
  line-height: 1.8;
}

.theory-content strong {
  color: var(--color-text-dark);
}

/* Словарь */
.vocabulary {
  margin-bottom: 25px;
}

.vocabulary-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.vocab-word {
  background: var(--color-bg);
  padding: 8px 16px;
  border-radius: 20px;
  font-size: 0.95rem;
  border: 1px solid var(--color-border);
}

.vocab-word strong {
  color: var(--color-primary);
  font-weight: 600;
}

/* Примеры */
.examples {
  margin-bottom: 25px;
}

.examples-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--color-bg-white);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.examples-table th {
  background: #EFF6FF;
  color: var(--color-text-dark);
  font-weight: 600;
  padding: 14px 12px;
  text-align: left;
  border-bottom: 2px solid var(--color-primary);
}

.examples-table td {
  padding: 12px;
  border-bottom: 1px solid var(--color-border);
  text-align: center;
}

.examples-table tr:last-child td {
  border-bottom: none;
}

.examples-table tr:hover {
  background: var(--color-bg);
}

.examples-table td:first-child {
  text-align: left;
  font-weight: 500;
}

.examples-table td:nth-child(2) {
  color: var(--color-text-muted);
  font-size: 0.95em;
}

.examples-table td:nth-child(3) {
  font-weight: 600;
  color: var(--color-text-dark);
}

/* ========================================
   Тренажёр
   ======================================== */
.trainer {
  background: #F8FAFC;
  padding: 25px;
  border-radius: var(--radius-md);
  border-left: 4px solid var(--color-primary);
}

.trainer-intro {
  color: var(--color-text-muted);
  margin-bottom: 20px;
  font-size: 0.95rem;
}

.exercises {
  display: flex;
  flex-direction: column;
  gap: 15px;
}

.exercise {
  background: var(--color-bg-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px;
  transition: box-shadow var(--transition);
}

.exercise:hover {
  box-shadow: var(--shadow-md);
}

.exercise .question {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-text-dark);
  margin-bottom: 15px;
}

.exercise .question .english {
  font-weight: 400;
  color: var(--color-text-muted);
  font-size: 0.95em;
  margin-left: 8px;
}

.answer-input {
  width: 100%;
  padding: 12px 15px;
  border: 2px solid var(--color-input-border);
  border-radius: var(--radius-sm);
  font-size: 1rem;
  font-family: inherit;
  transition: border-color var(--transition);
  background: var(--color-bg);
}

.answer-input:focus {
  outline: none;
  border-color: var(--color-primary);
  background: var(--color-bg-white);
}

.show-answer {
  background: var(--color-success);
  color: white;
  border: none;
  padding: 10px 20px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 0.95rem;
  font-weight: 600;
  margin-top: 12px;
  transition: background var(--transition);
}

.show-answer:hover {
  background: #059669;
}

.correct-answer {
  margin-top: 15px;
  padding: 15px;
  background: var(--color-success-bg);
  border-radius: var(--radius-sm);
  font-weight: 600;
  color: var(--color-text-dark);
  border-left: 3px solid var(--color-success);
  animation: fadeIn 0.3s ease;
}

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

/* ========================================
   Подвал
   ======================================== */
.footer {
  background: var(--color-text-dark);
  color: var(--color-text-muted);
  text-align: center;
  padding: 20px;
  margin-top: 40px;
}

/* ========================================
   Адаптивность
   ======================================== */
@media (max-width: 768px) {
  .header {
    padding: 15px 20px;
    flex-direction: column;
    text-align: center;
  }

  .header h1 {
    font-size: 1.4rem;
  }

  .navigation {
    padding: 10px 15px;
    justify-content: center;
  }

  .nav-tab {
    padding: 10px 16px;
    font-size: 0.9rem;
  }

  .container {
    padding: 20px 15px;
  }

  .phonetics {
    padding: 20px 15px;
  }

  .block {
    padding: 20px 15px;
  }

  /* Таблицы на мобильных */
  .phonetics-table,
  .rules-table,
  .examples-table {
    font-size: 0.9rem;
  }

  .phonetics-table th,
  .rules-table th,
  .examples-table th,
  .phonetics-table td,
  .rules-table td,
  .examples-table td {
    padding: 8px 6px;
  }

  /* Примеры в одну колонку */
  .examples-table thead {
    display: none;
  }

  .examples-table tr {
    display: block;
    margin-bottom: 15px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 15px;
  }

  .examples-table td {
    display: block;
    text-align: left !important;
    padding: 5px 0;
    border: none;
  }

  .examples-table td:first-child {
    font-weight: 600;
    color: var(--color-text-dark);
  }

  .examples-table td:nth-child(2)::before {
    content: "EN: ";
    font-weight: 600;
    color: var(--color-text-muted);
  }

  .examples-table td:nth-child(3)::before {
    content: "RO: ";
    font-weight: 600;
    color: var(--color-primary);
  }
}

@media (max-width: 480px) {
  .header h1 {
    font-size: 1.2rem;
  }

  .btn-clear {
    padding: 8px 15px;
    font-size: 0.85rem;
  }

  .nav-tab {
    padding: 8px 12px;
    font-size: 0.85rem;
  }

  .phonetics h2,
  .block h2 {
    font-size: 1.3rem;
  }

  .exercise .question {
    font-size: 1rem;
  }

  .answer-input {
    font-size: 0.95rem;
    padding: 10px 12px;
  }
}

/* Печать */
@media print {
  .header,
  .navigation,
  .btn-clear,
  .show-answer,
  .footer {
    display: none;
  }

  .block {
    box-shadow: none;
    border: 1px solid #ccc;
  }

  .correct-answer {
    display: block !important;
  }
}