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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #1e4a6b 0%, #2c5d7a 100%);
    min-height: 100vh;
    color: #333;
}

.header {
    background: #1e4a6b;
    padding: 20px 0;
    box-shadow: 0 4px 15px rgba(0,0,0,0.2);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-content {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 20px;
    flex-wrap: wrap;
    gap: 20px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 15px;
}

.logo-icon {
    width: 50px;
    height: 50px;
    background: linear-gradient(45deg, #d4af37, #f4d03f);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    color: #1e4a6b;
    font-size: 20px;
}

.logo-text {
    color: #d4af37;
    font-size: 24px;
    font-weight: bold;
}

.logo-subtitle {
    color: #fff;
    font-size: 12px;
    margin-top: 2px;
}

.back-button {
    background: linear-gradient(135deg, #d4af37, #f4d03f);
    color: #1e4a6b;
    text-decoration: none;
    padding: 10px 20px;
    border-radius: 8px;
    font-weight: 600;
    font-size: 14px;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 8px;
    box-shadow: 0 4px 10px rgba(0,0,0,0.2);
    white-space: nowrap;
}

.back-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 15px rgba(0,0,0,0.3);
}

.nav-menu {
    display: flex;
    gap: 20px;
    align-items: center;
    flex-wrap: wrap;
}

.nav-item {
    color: #fff;
    text-decoration: none;
    padding: 10px 15px;
    border-radius: 8px;
    transition: all 0.3s ease;
    font-weight: 500;
    position: relative;
}

.nav-item:hover {
    background: rgba(212, 175, 55, 0.2);
    color: #d4af37;
}

.nav-item.active {
    background: #d4af37;
    color: #1e4a6b;
}

.nav-item.locked {
    color: #777;
    cursor: not-allowed;
    opacity: 0.5;
}

.nav-item.locked::after {
    content: '🔒';
    margin-left: 5px;
}

.main-content {
    max-width: 1200px;
    margin: 40px auto;
    padding: 0 20px;
}

.lesson-section {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 15px;
    padding: 40px;
    margin-bottom: 40px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
    display: none;
}

.lesson-section.active {
    display: block;
    animation: fadeIn 0.8s ease-in;
}

.section-title {
    color: #1e4a6b;
    font-size: 2.5em;
    text-align: center;
    margin-bottom: 30px;
    font-weight: bold;
}

.content-box {
    background: linear-gradient(135deg, #d4af37, #f4d03f);
    color: #1e4a6b;
    padding: 30px;
    border-radius: 15px;
    text-align: center;
    box-shadow: 0 8px 25px rgba(0,0,0,0.2);
    margin-bottom: 30px;
}

.content-box h2 {
    font-size: 1.8em;
    margin-bottom: 20px;
    line-height: 1.3;
}

.content-details {
    background: rgba(212, 175, 55, 0.1);
    padding: 25px;
    border-radius: 10px;
    border-left: 5px solid #d4af37;
    margin-bottom: 30px;
}

.content-details ul {
    list-style: none;
    padding: 0;
}

.content-details li {
    margin: 15px 0;
    padding-left: 20px;
    position: relative;
    line-height: 1.6;
}

.content-details li::before {
    content: '•';
    color: #1e4a6b;
    font-size: 1.5em;
    position: absolute;
    left: 0;
    top: -2px;
}

.text-content {
    line-height: 1.8;
    margin-bottom: 25px;
}

.text-content p {
    margin-bottom: 15px;
    text-align: justify;
}

.text-content strong {
    color: #1e4a6b;
    font-weight: 600;
}

.highlight-box {
    background: linear-gradient(135deg, rgba(212, 175, 55, 0.1), rgba(244, 208, 63, 0.1));
    border: 2px solid #d4af37;
    border-radius: 10px;
    padding: 20px;
    margin: 20px 0;
}

.highlight-title {
    color: #1e4a6b;
    font-size: 1.3em;
    font-weight: bold;
    margin-bottom: 15px;
}

.example-box {
    background: rgba(30, 74, 107, 0.1);
    padding: 20px;
    border-radius: 8px;
    border-left: 4px solid #1e4a6b;
    margin: 15px 0;
}

.example-box p {
    margin: 10px 0;
    line-height: 1.6;
}

.table-container {
    overflow-x: auto;
    margin: 20px 0;
}

table {
    width: 100%;
    border-collapse: collapse;
    background: white;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

table th {
    background: #1e4a6b;
    color: white;
    padding: 15px;
    text-align: left;
    font-weight: bold;
}

table td {
    padding: 12px 15px;
    border-bottom: 1px solid #eee;
}

table tr:nth-child(even) {
    background: rgba(212, 175, 55, 0.1);
}

table tr:hover {
    background: rgba(212, 175, 55, 0.2);
}

/* Quiz Styles */
.quiz-container {
    background: rgba(255, 255, 255, 0.98);
    border: 3px solid #d4af37;
    border-radius: 15px;
    padding: 30px;
    margin: 30px 0;
}

.quiz-title {
    color: #1e4a6b;
    font-size: 1.5em;
    font-weight: bold;
    margin-bottom: 20px;
    text-align: center;
}

.quiz-question {
    background: rgba(30, 74, 107, 0.05);
    padding: 20px;
    border-radius: 10px;
    margin-bottom: 20px;
}

.question-text {
    color: #1e4a6b;
    font-size: 1.1em;
    font-weight: 600;
    margin-bottom: 15px;
}

.quiz-options {
    list-style: none;
    padding: 0;
}

.quiz-option {
    background: white;
    border: 2px solid #ddd;
    border-radius: 8px;
    padding: 12px 15px;
    margin: 10px 0;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 10px;
}

.quiz-option:hover {
    border-color: #d4af37;
    background: rgba(212, 175, 55, 0.1);
}

.quiz-option.selected {
    border-color: #1e4a6b;
    background: rgba(30, 74, 107, 0.1);
}

.quiz-option.correct {
    border-color: #4caf50;
    background: rgba(76, 175, 80, 0.1);
}

.quiz-option.incorrect {
    border-color: #f44336;
    background: rgba(244, 67, 54, 0.1);
}

.quiz-option input[type="radio"] {
    width: 20px;
    height: 20px;
    cursor: pointer;
}

.quiz-submit {
    background: #1e4a6b;
    color: white;
    border: none;
    padding: 12px 30px;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: block;
    margin: 20px auto 0;
}

.quiz-submit:hover {
    background: #2c5d7a;
    transform: translateY(-2px);
}

.quiz-submit:disabled {
    background: #ccc;
    cursor: not-allowed;
    transform: none;
}

.quiz-result {
    margin-top: 20px;
    padding: 15px;
    border-radius: 8px;
    text-align: center;
    font-weight: 600;
    display: none;
}

.quiz-result.success {
    background: rgba(76, 175, 80, 0.2);
    border: 2px solid #4caf50;
    color: #2e7d32;
    display: block;
}

.quiz-result.error {
    background: rgba(244, 67, 54, 0.2);
    border: 2px solid #f44336;
    color: #c62828;
    display: block;
}

/* Audio Player Styles */
.audio-player {
    background: #1e4a6b;
    border-radius: 10px;
    padding: 20px;
    margin: 20px 0;
    text-align: center;
}

.audio-controls {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
    margin-top: 15px;
}

.play-btn {
    background: #d4af37;
    color: #1e4a6b;
    border: none;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    font-size: 20px;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.play-btn:hover {
    background: #f4d03f;
    transform: scale(1.1);
}

.audio-progress {
    flex: 1;
    height: 8px;
    background: rgba(212, 175, 55, 0.3);
    border-radius: 4px;
    overflow: hidden;
    cursor: pointer;
    position: relative;
}

.progress-bar {
    height: 100%;
    background: #d4af37;
    width: 0%;
    transition: width 0.1s ease;
}

.time-display {
    color: #d4af37;
    font-size: 14px;
    font-weight: 500;
}

/* Navigation Buttons */
.navigation-buttons {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 30px;
    padding: 20px 0;
}

.nav-button {
    background: #1e4a6b;
    color: white;
    border: none;
    padding: 12px 25px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 16px;
    font-weight: 500;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 8px;
}

.nav-button:hover {
    background: #2c5d7a;
    transform: translateY(-2px);
}

.nav-button:disabled {
    background: #ccc;
    cursor: not-allowed;
    transform: none;
}

.progress-indicator {
    text-align: center;
    color: #666;
    font-size: 14px;
}

/* Footer */
.footer {
    background: #1e4a6b;
    color: white;
    text-align: center;
    padding: 30px 0;
    margin-top: 60px;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Utility Classes */
.red-text {
    color: #d32f2f;
    font-weight: bold;
}

.blue-text {
    color: #1e4a6b;
    font-weight: bold;
}

.green-text {
    color: #388e3c;
    font-weight: bold;
}

.purple-text {
    color: #7b1fa2;
    font-weight: bold;
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in {
    animation: fadeIn 0.8s ease-in;
}

/* Responsive Design */
@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
    }

    .nav-menu {
        flex-wrap: wrap;
        gap: 10px;
        justify-content: center;
    }

    .nav-item {
        padding: 8px 12px;
        font-size: 14px;
    }

    .section-title {
        font-size: 2em;
    }

    .lesson-section {
        padding: 20px;
    }

    .content-box h2 {
        font-size: 1.4em;
    }

    table {
        font-size: 14px;
    }

    table th,
    table td {
        padding: 10px 8px;
    }
}

/* Hero Section for Index */
.hero-section {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 15px;
    padding: 40px;
    margin-bottom: 40px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
}

.hero-title {
    color: #1e4a6b;
    font-size: 2.5em;
    text-align: center;
    margin-bottom: 30px;
    font-weight: bold;
}

.flags-container {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 30px;
    margin: 30px 0;
}

.flag-placeholder {
    width: 150px;
    height: 100px;
    border: 3px dashed #d4af37;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #1e4a6b;
    font-weight: 600;
    background: rgba(212, 175, 55, 0.1);
}

.vs-text {
    font-size: 2em;
    color: #d4af37;
    font-weight: bold;
}

/* Classes Grid for Index */
.classes-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
    margin-top: 30px;
}

.class-card {
    background: linear-gradient(135deg, #1e4a6b, #2c5d7a);
    color: white;
    padding: 25px;
    border-radius: 12px;
    text-decoration: none;
    transition: all 0.3s ease;
    border: 2px solid transparent;
    position: relative;
    overflow: hidden;
    display: block;
}

.class-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(212, 175, 55, 0.3), transparent);
    transition: left 0.5s ease;
}

.class-card:hover::before {
    left: 100%;
}

.class-card:hover {
    transform: translateY(-5px);
    border-color: #d4af37;
    box-shadow: 0 15px 35px rgba(0,0,0,0.3);
}

.class-number {
    background: #d4af37;
    color: #1e4a6b;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    margin-bottom: 15px;
    font-size: 1.3em;
}

.class-title {
    font-size: 1.3em;
    font-weight: bold;
    margin-bottom: 10px;
}

.class-description {
    font-size: 0.95em;
    opacity: 0.9;
    line-height: 1.5;
}

/* Clarifying Box - Caixa de esclarecimento */
.clarifying-box {
    background: linear-gradient(135deg, rgba(103, 58, 183, 0.1), rgba(156, 39, 176, 0.1));
    border: 2px solid #7b1fa2;
    border-radius: 10px;
    padding: 20px;
    margin: 20px 0;
    line-height: 1.8;
}

.clarifying-box p {
    margin: 0;
    color: #4a148c;
    font-weight: 500;
}

/* Table Container - Melhoria para tabelas */
.table {
    margin: 25px 0;
}

.table table {
    width: 100%;
    border-collapse: collapse;
    background: white;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

.table table th {
    background: #1e4a6b;
    color: white;
    padding: 18px 15px;
    text-align: left;
    font-weight: bold;
    font-size: 1.05em;
}

.table table td {
    padding: 15px;
    border-bottom: 1px solid #eee;
    line-height: 1.6;
}

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

.table table tr:nth-child(even) {
    background: rgba(212, 175, 55, 0.05);
}

.table table tr:hover {
    background: rgba(212, 175, 55, 0.15);
}

.table table td:first-child {
    font-weight: 600;
    color: #1e4a6b;
}

.observation-box {
    background: linear-gradient(135deg, rgba(255, 193, 7, 0.1), rgba(255, 235, 59, 0.1));
    border: 2px solid #ffa726;
    border-left: 6px solid #ff9800;
    border-radius: 12px;
    padding: 25px;
    margin: 25px 0;
    box-shadow: 0 4px 15px rgba(255, 152, 0, 0.15);
    position: relative;
    overflow: hidden;
}

.observation-box::before {
    content: '';
    position: absolute;
    top: -2px;
    left: -2px;
    right: -2px;
    bottom: -2px;
    background: linear-gradient(45deg, #ff9800, #ffc107, #ff9800);
    border-radius: 12px;
    z-index: -1;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.observation-box:hover::before {
    opacity: 0.1;
}

.observation-box .observation-title {
    color: #e65100;
    font-size: 1.3em;
    font-weight: bold;
    margin-bottom: 15px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.observation-box .observation-title::before {
    content: '💡';
    font-size: 1.2em;
}

.observation-box p {
    color: #5d4037;
    line-height: 1.8;
    margin-bottom: 10px;
}

.observation-box p:last-child {
    margin-bottom: 0;
}

.observation-box ul {
    margin: 15px 0;
    padding-left: 25px;
}

.observation-box ul li {
    color: #5d4037;
    line-height: 1.8;
    margin: 10px 0;
}

.observation-box strong {
    color: #e65100;
    font-weight: 600;
}

.observation-box em {
    color: #f57c00;
    font-style: italic;
}

/* Variante alternativa com ícone diferente */
.observation-box.warning {
    background: linear-gradient(135deg, rgba(244, 67, 54, 0.1), rgba(255, 87, 34, 0.1));
    border-color: #ff7043;
    border-left-color: #f44336;
}

.observation-box.warning .observation-title {
    color: #c62828;
}

.observation-box.warning .observation-title::before {
    content: '⚠️';
}

/* Variante para informação */
.observation-box.info {
    background: linear-gradient(135deg, rgba(33, 150, 243, 0.1), rgba(100, 181, 246, 0.1));
    border-color: #64b5f6;
    border-left-color: #2196f3;
}

.observation-box.info .observation-title {
    color: #1565c0;
}

.observation-box.info .observation-title::before {
    content: 'ℹ️';
}

/* Variante para sucesso */
.observation-box.success {
    background: linear-gradient(135deg, rgba(76, 175, 80, 0.1), rgba(129, 199, 132, 0.1));
    border-color: #81c784;
    border-left-color: #4caf50;
}

.observation-box.success .observation-title {
    color: #2e7d32;
}

.observation-box.success .observation-title::before {
    content: '✅';
}
/* ═══════════════════════════════════════════════════════════════════════════
   AFF EDUCATION — INGLÊS 3º ANO EF
   Complemento do design system (navy #1e4a6b + gold #d4af37)
   Usado por index.html e por todas as aulas (aula1.html … aula14.html)
   ═══════════════════════════════════════════════════════════════════════════ */


/* ───────────────────────────────────────────────────────────────────────────
   1. ÍNDICE — badge, unidades e legenda
   ─────────────────────────────────────────────────────────────────────────── */

.course-badge {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    background: linear-gradient(135deg, #d4af37, #f4d03f);
    color: #1e4a6b;
    font-weight: 800;
    font-size: 1em;
    padding: 10px 24px;
    border-radius: 30px;
    margin: 16px auto 0;
    box-shadow: 0 4px 15px rgba(212,175,55,0.4);
    letter-spacing: 0.5px;
}

.unit-label {
    grid-column: 1 / -1;
    display: flex;
    align-items: center;
    gap: 14px;
    margin: 32px 0 8px;
}

.unit-label .unit-bar {
    flex: 1;
    height: 2px;
    background: linear-gradient(90deg, #d4af37, transparent);
}

.unit-label .unit-bar.right {
    background: linear-gradient(90deg, transparent, #d4af37);
}

.unit-label .unit-text {
    background: linear-gradient(135deg, #d4af37, #f4d03f);
    color: #1e4a6b;
    font-weight: 800;
    font-size: 0.82em;
    letter-spacing: 1.5px;
    text-transform: uppercase;
    padding: 5px 16px;
    border-radius: 20px;
    white-space: nowrap;
}

.unit-legend {
    display: flex;
    flex-wrap: wrap;
    gap: 10px 18px;
    justify-content: center;
    margin: 24px 0 8px;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 7px;
    font-size: 0.88em;
    font-weight: 600;
    color: #444;
}

.legend-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    flex-shrink: 0;
}

/* Cores por unidade — badge numérico + faixa lateral do card */
.class-card.unit-alpha  .class-number { background: linear-gradient(135deg,#e67e22,#f39c12); }
.class-card.unit-desc   .class-number { background: linear-gradient(135deg,#27ae60,#2ecc71); }
.class-card.unit-pron   .class-number { background: linear-gradient(135deg,#2980b9,#3498db); }
.class-card.unit-poss   .class-number { background: linear-gradient(135deg,#8e44ad,#a569bd); }
.class-card.unit-quest  .class-number { background: linear-gradient(135deg,#c0392b,#e74c3c); }
.class-card.unit-review .class-number { background: linear-gradient(135deg,#b8860b,#d4af37); }

.class-card.unit-alpha  { border-left: 4px solid #e67e22; }
.class-card.unit-desc   { border-left: 4px solid #27ae60; }
.class-card.unit-pron   { border-left: 4px solid #2980b9; }
.class-card.unit-poss   { border-left: 4px solid #8e44ad; }
.class-card.unit-quest  { border-left: 4px solid #c0392b; }
.class-card.unit-review { border-left: 4px solid #d4af37; }

/* Etiqueta do capítulo dentro do card (ex.: "Livro — Cap. 3") */
.class-source {
    display: inline-block;
    margin-top: 14px;
    font-size: 0.78em;
    font-weight: 700;
    letter-spacing: 0.6px;
    text-transform: uppercase;
    color: #f4d03f;
    background: rgba(212,175,55,0.15);
    border: 1px solid rgba(212,175,55,0.45);
    padding: 3px 10px;
    border-radius: 20px;
}


/* ───────────────────────────────────────────────────────────────────────────
   2. AULAS — blocos de conteúdo
   ─────────────────────────────────────────────────────────────────────────── */

.sub-title {
    color: #1e4a6b;
    font-size: 1.25em;
    font-weight: 700;
    margin: 30px 0 12px;
    border-bottom: 2px solid #d4af37;
    padding-bottom: 6px;
}

/* Caixa de regra gramatical */
.rule-box {
    background: linear-gradient(135deg, #1e4a6b, #2c5d7a);
    color: white;
    padding: 20px 26px;
    border-radius: 12px;
    font-size: 1.05em;
    font-weight: 600;
    margin: 22px 0;
    line-height: 1.7;
}

.rule-box .label {
    color: #f4d03f;
    font-size: 0.82em;
    font-weight: 800;
    letter-spacing: 1.2px;
    text-transform: uppercase;
    margin-bottom: 8px;
}

.rule-box .destaque { color: #f4d03f; }

/* Cartões de regra lado a lado */
.rule-cards {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 14px;
    margin: 20px 0;
}

.rule-card {
    border-radius: 12px;
    padding: 20px;
    border-left: 5px solid;
    text-align: center;
}

.rule-card.verde { background: rgba(39,174,96,0.09);  border-color: #27ae60; }
.rule-card.azul  { background: rgba(41,128,185,0.09); border-color: #2980b9; }
.rule-card.roxo  { background: rgba(142,68,173,0.09); border-color: #8e44ad; }
.rule-card.ouro  { background: rgba(212,175,55,0.12); border-color: #d4af37; }

.rule-card .rtag {
    display: inline-block;
    font-size: 1.35em;
    font-weight: 900;
    padding: 5px 16px;
    border-radius: 8px;
    margin-bottom: 12px;
    letter-spacing: 1px;
    color: white;
}

.rule-card.verde .rtag { background: #27ae60; }
.rule-card.azul  .rtag { background: #2980b9; }
.rule-card.roxo  .rtag { background: #8e44ad; }
.rule-card.ouro  .rtag { background: #b8860b; }

.rule-card .rexemplos { color: #333; font-size: 0.95em; line-height: 1.9; }
.rule-card .rexemplos span { font-weight: 700; color: #1e4a6b; }

/* Dicas */
.notebook-tip,
.warning-tip,
.culture-tip {
    border-radius: 12px;
    padding: 18px 24px;
    margin: 24px 0;
    display: flex;
    align-items: flex-start;
    gap: 14px;
}

.notebook-tip .icon,
.warning-tip .icon,
.culture-tip .icon { font-size: 2em; flex-shrink: 0; line-height: 1; }

.notebook-tip p,
.warning-tip p,
.culture-tip p { line-height: 1.75; font-weight: 500; margin: 0; }

.notebook-tip {
    background: linear-gradient(135deg, rgba(76,175,80,0.10), rgba(129,199,132,0.10));
    border: 2px solid #66bb6a;
    border-left: 6px solid #4caf50;
}
.notebook-tip p { color: #2e7d32; }
.notebook-tip strong { color: #1b5e20; }

.warning-tip {
    background: linear-gradient(135deg, rgba(230,126,34,0.10), rgba(243,156,18,0.10));
    border: 2px solid #f39c12;
    border-left: 6px solid #e67e22;
}
.warning-tip p { color: #7d3c00; }
.warning-tip strong { color: #6e2d00; }

.culture-tip {
    background: linear-gradient(135deg, rgba(41,128,185,0.10), rgba(52,152,219,0.10));
    border: 2px solid #5dade2;
    border-left: 6px solid #2980b9;
}
.culture-tip p { color: #1a5276; }
.culture-tip strong { color: #154360; }

/* Resumo de fim de parte */
.summary-box {
    background: linear-gradient(135deg, #1e4a6b, #2c5d7a);
    color: white;
    border-radius: 14px;
    padding: 24px 28px;
    margin: 28px 0;
    line-height: 1.8;
}

.summary-box .rtitle {
    color: #f4d03f;
    font-size: 1.15em;
    font-weight: 800;
    margin-bottom: 12px;
    letter-spacing: 0.5px;
}

.summary-box ul { padding-left: 22px; }
.summary-box li { margin: 8px 0; }
.summary-box strong { color: #f4d03f; }


/* ───────────────────────────────────────────────────────────────────────────
   3. AULAS — componentes específicos de inglês
   ─────────────────────────────────────────────────────────────────────────── */

/* Vocabulário: palavra + pronúncia + tradução */
.vocab-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 12px;
    margin: 20px 0;
}

.vocab-card {
    background: rgba(30,74,107,0.06);
    border-left: 4px solid #d4af37;
    border-radius: 10px;
    padding: 14px 16px;
    transition: all 0.25s ease;
}

.vocab-card:hover {
    background: rgba(212,175,55,0.14);
    transform: translateY(-3px);
}

.vocab-card .word {
    display: block;
    font-size: 1.2em;
    font-weight: 800;
    color: #1e4a6b;
    letter-spacing: 0.5px;
}

.vocab-card .pt {
    display: block;
    color: #555;
    font-size: 0.92em;
    margin-top: 4px;
}

/* Pronúncia aproximada, como no livro: / kei /, / dábliu / */
.phonetic {
    font-family: 'Consolas', 'Courier New', monospace;
    color: #c0392b;
    font-weight: 700;
    font-size: 0.95em;
    background: rgba(192,57,43,0.07);
    padding: 1px 7px;
    border-radius: 5px;
    white-space: nowrap;
}

/* Grade do alfabeto / números */
.letter-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(110px, 1fr));
    gap: 10px;
    margin: 20px 0;
}

.letter-card {
    background: white;
    border: 2px solid #d4af37;
    border-radius: 10px;
    padding: 12px 8px;
    text-align: center;
    box-shadow: 0 3px 10px rgba(0,0,0,0.06);
}

.letter-card .big {
    display: block;
    font-size: 1.9em;
    font-weight: 900;
    color: #1e4a6b;
    line-height: 1.1;
}

.letter-card .say {
    display: block;
    margin-top: 6px;
    font-family: 'Consolas', 'Courier New', monospace;
    color: #c0392b;
    font-weight: 700;
    font-size: 0.88em;
}

.letter-card.vowel {
    background: rgba(212,175,55,0.16);
    border-width: 3px;
}

/* Diálogos (greetings, conversation) */
.dialogue-box {
    background: rgba(30,74,107,0.05);
    border: 2px dashed #1e4a6b;
    border-radius: 14px;
    padding: 22px 24px;
    margin: 24px 0;
}

.dialogue-line {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    margin: 12px 0;
    line-height: 1.7;
}

.dialogue-line .who {
    flex-shrink: 0;
    width: 34px;
    height: 34px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    color: white;
    font-size: 0.95em;
}

.dialogue-line.a .who { background: #1e4a6b; }
.dialogue-line.b .who { background: #d4af37; color: #1e4a6b; }

.dialogue-line .says { color: #333; font-weight: 600; }
.dialogue-line .says em { color: #777; font-weight: 400; font-style: italic; }

/* Cores (Chapter 3) */
.color-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    gap: 12px;
    margin: 20px 0;
}

.color-chip {
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 4px 12px rgba(0,0,0,0.12);
    background: white;
}

.color-chip .swatch { height: 62px; }

.color-chip .names {
    padding: 10px 12px;
    text-align: center;
}

.color-chip .en {
    display: block;
    font-weight: 800;
    color: #1e4a6b;
    letter-spacing: 0.5px;
}

.color-chip .pt {
    display: block;
    font-size: 0.88em;
    color: #666;
    margin-top: 2px;
}

/* Sílaba/palavra em destaque dentro de frases-modelo */
.stress { color: #c0392b; font-weight: 800; }


/* ───────────────────────────────────────────────────────────────────────────
   4. AULAS — bloco de exercícios (Parte 3)
   ─────────────────────────────────────────────────────────────────────────── */

.exercise-block {
    background: rgba(255,255,255,0.98);
    border: 3px solid #d4af37;
    border-radius: 15px;
    padding: 30px;
    margin: 30px 0;
}

.exercise-title {
    color: #1e4a6b;
    font-size: 1.45em;
    font-weight: 800;
    text-align: center;
    margin-bottom: 6px;
}

.exercise-subtitle {
    text-align: center;
    color: #666;
    font-size: 0.95em;
    margin-bottom: 24px;
}

/* Exercícios de completar */
.fill-item {
    background: rgba(30,74,107,0.05);
    border-radius: 10px;
    padding: 18px 20px;
    margin-bottom: 16px;
}

.fill-item .numero {
    display: inline-block;
    background: #1e4a6b;
    color: white;
    width: 28px;
    height: 28px;
    border-radius: 50%;
    text-align: center;
    line-height: 28px;
    font-weight: 800;
    font-size: 0.9em;
    margin-right: 10px;
    vertical-align: top;
}

.fill-item .enunciado {
    color: #1e4a6b;
    font-weight: 600;
    line-height: 1.7;
}

.fill-input {
    display: block;
    margin-top: 12px;
    padding: 10px 14px;
    border: 2px solid #ddd;
    border-radius: 8px;
    font-size: 1em;
    font-family: inherit;
    width: 100%;
    max-width: 340px;
    transition: all 0.25s ease;
}

.fill-input:focus {
    outline: none;
    border-color: #d4af37;
    box-shadow: 0 0 0 3px rgba(212,175,55,0.25);
}

.fill-input.correct   { border-color: #4caf50; background: rgba(76,175,80,0.10); }
.fill-input.incorrect { border-color: #f44336; background: rgba(244,67,54,0.10); }

.fill-item .dica {
    display: block;
    margin-top: 8px;
    color: #777;
    font-size: 0.87em;
    font-style: italic;
}

/* Botão de conferir */
.check-btn {
    background: linear-gradient(135deg, #d4af37, #f4d03f);
    color: #1e4a6b;
    border: none;
    padding: 13px 32px;
    border-radius: 8px;
    font-size: 1em;
    font-weight: 700;
    font-family: inherit;
    cursor: pointer;
    transition: all 0.3s ease;
    display: block;
    margin: 24px auto 0;
    box-shadow: 0 4px 12px rgba(212,175,55,0.35);
}

.check-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 7px 18px rgba(212,175,55,0.45);
}

.check-btn:focus-visible {
    outline: 3px solid #1e4a6b;
    outline-offset: 3px;
}

/* Caixa de resultado */
.score-box {
    display: none;
    margin-top: 20px;
    padding: 16px 20px;
    border-radius: 10px;
    text-align: center;
    font-weight: 700;
    font-size: 1.05em;
}

.score-box.show { display: block; }

.score-box.great { background: rgba(76,175,80,0.18);  border: 2px solid #4caf50; color: #2e7d32; }
.score-box.ok    { background: rgba(255,152,0,0.18);  border: 2px solid #ff9800; color: #e65100; }
.score-box.retry { background: rgba(244,67,54,0.15);  border: 2px solid #f44336; color: #c62828; }


/* ───────────────────────────────────────────────────────────────────────────
   5. Acessibilidade e responsividade
   ─────────────────────────────────────────────────────────────────────────── */

a:focus-visible,
button:focus-visible,
.quiz-option:focus-visible {
    outline: 3px solid #d4af37;
    outline-offset: 3px;
}

@media (max-width: 768px) {
    .hero-title { font-size: 1.9em; }
    .hero-section { padding: 24px 20px; }
    .flags-container { gap: 14px; }
    .exercise-block { padding: 20px 16px; }
    .rule-box, .summary-box { padding: 18px 20px; }
    .unit-label .unit-text { font-size: 0.72em; white-space: normal; text-align: center; }
    .course-badge { font-size: 0.85em; padding: 10px 16px; text-align: center; }
}

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.001ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.001ms !important;
    }
    .class-card:hover { transform: none; }
}