:root {
    --bg: #faf6f0;
    --card: #fff9f0;
    --text: #5a4a3a;
    --primary: #c8b6a6;
    --accent: #a4907c;
    --correct: #8a9b68;
    --incorrect: #b46b6b;
}

body {
    background-color: var(--bg);
    color: var(--text);
    font-family: 'Georgia', serif;
    line-height: 1.6;
    margin: 0;
    padding: 0;
}

header {
    background-color: var(--primary);
    padding: 1.5rem 0;
    text-align: center;
    color: white;
    position: relative;
    width: 100%;
    top: 0;
    z-index: 1000;
}

nav {
    position: sticky;
    top: 1px;
    z-index: 999;
    background-color: var(--accent);
    padding: 0.8rem 0;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

nav ul {
    display: flex;
    justify-content: center;
    gap: 0.8rem;
    list-style: none;
    margin: 0;
    padding: 0 1rem;
    flex-wrap: wrap;
}

nav a {
    color: white;
    text-decoration: none;
    font-size: 0.9rem;
    padding: 0.3rem 0.6rem;
    border-radius: 4px;
    transition: background 0.3s;
    white-space: nowrap;
}

nav a:hover {
    background-color: rgba(255,255,255,0.2);
}

.container {
    max-width: 800px;
    margin: 180px auto 2rem;
    padding: 0 1rem;
    width: 100%;
    box-sizing: border-box;
}

section {
    background-color: var(--card);
    border-radius: 12px;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    box-shadow: 0 4px 12px rgba(0,0,0,0.05);
}

h2 {
    color: var(--accent);
    margin-bottom: 1.2rem;
    font-weight: normal;
    font-size: 1.5rem;
    border-bottom: 1px solid var(--primary);
    padding-bottom: 0.5rem;
}

.command-table {
    width: 100%;
    border-collapse: collapse;
    margin: 1rem 0;
    font-size: 0.9rem;
    word-break: break-word;
}

.command-table th {
    background-color: var(--primary);
    color: white;
    padding: 0.6rem;
    text-align: left;
}

.command-table td {
    padding: 0.6rem;
    border-bottom: 1px solid var(--primary);
}

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

.example-card {
    margin-bottom: 1.5rem;
}

.category-tabs {
    display: flex;
    gap: 6px;
    margin-bottom: 15px;
    flex-wrap: wrap;
    background: var(--primary);
    padding: 8px;
    border-radius: 8px;
    overflow-x: auto;
}

.tab-button {
    background: var(--accent);
    color: white;
    border: none;
    padding: 6px 12px;
    border-radius: 6px;
    cursor: pointer;
    transition: opacity 0.3s;
    font-size: 0.8rem;
    white-space: nowrap;
}

.tab-button:hover {
    opacity: 0.9;
}

.tab-button.active {
    background: white;
    color: var(--accent);
}

.category-content {
    display: none;
    overflow-x: auto;
}

.image-container img {
    max-width: 100%;
    height: auto; 
    aspect-ratio: 1/1;
    object-fit: cover;
    border-radius: 8px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
}

.image-container {
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
    justify-content: center;
    margin: 1rem 0;
}

img {
    max-width: 100%;
    border-radius: 8px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
}

footer {
    text-align: center;
    padding: 1.5rem 0;
    color: white;
    font-size: 0.8rem;
    background-color: var(--accent);
    margin-top: 2rem;
}

/* Практическая секция */
.practice-section {
    background-color: rgba(200, 182, 166, 0.1);
    padding: 1.5rem;
    border-radius: 12px;
    margin: 2rem 0;
    border: 1px solid var(--primary);
}

/* Карточки заданий */
.exercise-card {
    background: var(--card);
    border-radius: 8px;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    box-shadow: 0 2px 8px rgba(0,0,0,0.05);
    border: 1px solid rgba(164, 144, 124, 0.2);
}

.exercise-card h3 {
    color: var(--accent);
    margin-top: 0;
    border-bottom: 1px solid var(--primary);
    padding-bottom: 0.5rem;
}

/* Конструктор слов */
.word-builder {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    margin: 1rem 0;
}

.word-part {
    padding: 8px 12px;
    background: rgba(164, 144, 124, 0.1);
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s;
    color: var(--text);
    border: 1px solid var(--primary);
    font-family: 'Georgia', serif;
}

.word-part:hover {
    background: rgba(164, 144, 124, 0.2);
}

.word-parts-container {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 1rem;
}

.translation-area {
    min-height: 60px;
    border: 1px dashed var(--accent);
    border-radius: 8px;
    padding: 1rem;
    margin: 1rem 0;
    background: rgba(200, 182, 166, 0.05);
    font-style: italic;
    color: var(--text);
}

/* Викторина */
.quiz-options {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin: 1rem 0;
}

.quiz-option {
    padding: 10px 15px;
    background: var(--card);
    border: 1px solid var(--primary);
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s;
}

.quiz-option:hover {
    background: rgba(200, 182, 166, 0.2);
}

.quiz-option.correct {
    background: rgba(138, 155, 104, 0.2);
    border-color: var(--correct);
}

.quiz-option.incorrect {
    background: rgba(180, 107, 107, 0.2);
    border-color: var(--incorrect);
}

/* Поле ввода */
.input-exercise {
    margin: 1rem 0;
}

.input-exercise input {
    width: 100%;
    padding: 10px;
    border: 1px solid var(--primary);
    border-radius: 6px;
    background: var(--card);
    font-family: 'Georgia', serif;
    color: var(--text);
}

/* Флеш-карты */
.flashcard {
    width: 100%;
    height: 200px;
    perspective: 1000px;
    margin: 1.5rem auto;
    max-width: 400px;
}

.flashcard-inner {
    position: relative;
    width: 100%;
    height: 100%;
    transition: transform 0.6s;
    transform-style: preserve-3d;
}

.flashcard.flipped .flashcard-inner {
    transform: rotateY(180deg);
}

.flashcard-front,
.flashcard-back {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    background: var(--card);
    border-radius: 12px;
    padding: 1.5rem;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    border: 1px solid var(--primary);
}

.flashcard-back {
    transform: rotateY(180deg);
}

.flashcard-word {
    font-size: 1.5rem;
    font-weight: bold;
    margin-bottom: 0.5rem;
    color: var(--accent);
    text-align: center;
}

.flashcard-example {
    font-style: italic;
    color: var(--text);
    text-align: center;
    opacity: 0.8;
}

.flashcard-nav {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-top: 1rem;
}

/* Кнопки */
.btn {
    display: inline-block;
    padding: 8px 16px;
    background: var(--accent);
    color: white;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.3s;
    font-family: 'Georgia', serif;
    margin-top: 0.5rem;
}

.btn:hover {
    background: #8c7a66;
    transform: translateY(-1px);
}

/* Фидбэк */
.feedback {
    padding: 0.8rem;
    border-radius: 6px;
    margin-top: 1rem;
    display: none;
}

.feedback.correct {
    background: rgba(138, 155, 104, 0.1);
    border: 1px solid var(--correct);
    color: var(--correct);
    display: block;
}

.feedback.incorrect {
    background: rgba(180, 107, 107, 0.1);
    border: 1px solid var(--incorrect);
    color: var(--incorrect);
    display: block;
}

/* Дополнительные задания */
.matching-exercise {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin: 1rem 0;
}

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

.match-item {
    padding: 8px 12px;
    background: rgba(164, 144, 124, 0.1);
    border-radius: 6px;
    border: 1px solid var(--primary);
    flex: 1;
}

.match-item.dragged {
    opacity: 0.5;
}

.fill-blank {
    margin: 1rem 0;
}

.fill-blank-sentence {
    margin-bottom: 0.5rem;
}

.blank {
    display: inline-block;
    min-width: 80px;
    border-bottom: 1px solid var(--text);
    margin: 0 5px;
    text-align: center;
}

/* Прогресс */
.progress-container {
    background: var(--card);
    padding: 1.5rem;
    border-radius: 12px;
    margin: 2rem 0;
    box-shadow: 0 2px 8px rgba(0,0,0,0.05);
    border: 1px solid rgba(164, 144, 124, 0.2);
}

.progress-bar {
    height: 16px;
    background: rgba(164, 144, 124, 0.1);
    border-radius: 8px;
    margin: 1rem 0;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: var(--accent);
    width: 30%;
    transition: width 0.5s;
}

/* Адаптивность */
@media (min-width: 768px) {
    body {
        padding-top: 0;
    }
    
    header {
        position: relative;
        width: 100%;
        z-index: 1000;
    }
    
    nav {
        position: sticky;
        top: 0;
        z-index: 999;
        padding: 0.5rem 0;
    }
    
    nav ul {
        padding: 0 1rem;
    }
    
    nav a {
        padding: 0.5rem 0.8rem;
        font-size: 0.9rem;
    }
    
    .container {
        margin: 2rem auto;
        padding: 0 2rem;
    }
    
    h2 {
        font-size: 1.8rem;
    }
    
    .command-table {
        font-size: 1rem;
    }
    
    .tab-button {
        font-size: 0.9rem;
        padding: 8px 16px;
    }
    
    img {
        max-width: 300px;
    }
}

@media (max-width: 480px) {
    .match-pair {
        flex-direction: column;
    }
    
    .flashcard {
        height: 160px;
    }
    
    .flashcard-word {
        font-size: 1.2rem;
    }
}