:root {
    --bg: #0a0a0b;
    --bg-secondary: #141416;
    --bg-card: #1a1a1f;
    --text: #e4e4e7;
    --text-secondary: #a1a1aa;
    --accent: #8b5cf6;
    --accent-hover: #7c3aed;
    --border: #27272a;
    --success: #22c55e;
    --error: #ef4444;
    --warning: #f59e0b;
    --radius: 12px;
    --font-ui: 'Inter', -apple-system, sans-serif;
    --font-word: 'JetBrains Mono', monospace;
}

[data-theme="light"] {
    --bg: #f8f9fa;
    --bg-secondary: #ffffff;
    --bg-card: #ffffff;
    --text: #18181b;
    --text-secondary: #52525b;
    --accent: #7c3aed;
    --accent-hover: #6d28d9;
    --border: #e4e4e7;
}

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

body {
    font-family: var(--font-ui);
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    line-height: 1.6;
}

/* Navigation */
.main-nav {
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
}

.nav-top {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.75rem 1rem;
}

.nav-brand-link {
    color: var(--accent);
    text-decoration: none;
    font-weight: 700;
    font-size: 1.1rem;
}

.nav-right {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.nav-logout {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.85rem;
}

.nav-logout:hover {
    color: var(--error);
}

/* Main content */
main {
    max-width: 960px;
    margin: 0 auto;
    padding: 2rem 1rem;
}

/* Auth */
.auth-container {
    max-width: 400px;
    margin: 4rem auto;
    text-align: center;
}

.auth-container h1 {
    font-size: 1.75rem;
    margin-bottom: 0.5rem;
}

.auth-subtitle {
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

.auth-form {
    text-align: left;
}

.form-group {
    margin-bottom: 1rem;
}

.form-group label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: 0.375rem;
    color: var(--text-secondary);
}

.form-group input {
    width: 100%;
    padding: 0.625rem 0.875rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text);
    font-size: 1rem;
    font-family: var(--font-ui);
    transition: border-color 0.2s;
}

.form-group input:focus {
    outline: none;
    border-color: var(--accent);
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.625rem 1.25rem;
    border-radius: 8px;
    font-size: 0.95rem;
    font-weight: 500;
    text-decoration: none;
    cursor: pointer;
    border: none;
    transition: all 0.2s;
    font-family: var(--font-ui);
    text-align: center;
}

.btn-primary {
    width: 100%;
    background: var(--accent);
    color: white;
}

.btn-primary:hover {
    background: var(--accent-hover);
}

.btn-google {
    width: 100%;
    background: var(--bg-secondary);
    color: var(--text);
    border: 1px solid var(--border);
}

.btn-google:hover {
    background: var(--bg-card);
}

.auth-divider {
    display: flex;
    align-items: center;
    margin: 1.5rem 0;
    color: var(--text-secondary);
    font-size: 0.85rem;
}

.auth-divider::before,
.auth-divider::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--border);
}

.auth-divider span {
    padding: 0 1rem;
}

.auth-social {
    margin-bottom: 1.5rem;
}

.auth-link {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.auth-link a {
    color: var(--accent);
    text-decoration: none;
}

/* Alerts */
.alert {
    padding: 0.75rem 1rem;
    border-radius: 8px;
    margin-bottom: 1rem;
    font-size: 0.9rem;
}

.alert-error {
    background: rgba(239, 68, 68, 0.1);
    color: var(--error);
    border: 1px solid rgba(239, 68, 68, 0.2);
}

/* Dashboard */
.dashboard h1 {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 1rem;
    margin-bottom: 2.5rem;
}

.stat-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.25rem;
    text-align: center;
}

.stat-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--accent);
    font-family: var(--font-word);
}

.stat-label {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-top: 0.25rem;
}

.practice-links h2 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
}

.practice-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
}

.practice-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.5rem;
    text-decoration: none;
    color: var(--text);
    transition: all 0.2s;
    text-align: center;
}

.practice-card:hover {
    border-color: var(--accent);
    transform: translateY(-2px);
}

.practice-icon {
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

.practice-title {
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.practice-desc {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.practice-card-full {
    display: block;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.25rem;
    text-decoration: none;
    color: var(--text);
    transition: all 0.2s;
    text-align: center;
    margin-top: 1rem;
}

.practice-card-full:hover {
    border-color: var(--accent);
}

.practice-card-full .practice-title {
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.practice-card-full .practice-desc {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

/* Words */
.words-page h1 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.words-filters {
    display: flex;
    gap: 0.75rem;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
}

.words-filters input,
.words-filters select {
    padding: 0.5rem 0.75rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text);
    font-size: 0.9rem;
    font-family: var(--font-ui);
    flex: 1;
    min-width: 0;
}

.words-filters input {
    min-width: 140px;
}

.words-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    gap: 0.75rem;
}

.word-card-item {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1rem;
    text-decoration: none;
    color: var(--text);
    transition: all 0.2s;
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
}

.word-card-item:hover {
    border-color: var(--accent);
    transform: translateY(-1px);
}

.word-card-top {
    display: flex;
    align-items: baseline;
    gap: 0.35rem;
}

.word-card-article {
    color: var(--accent);
    font-size: 0.8rem;
    font-family: var(--font-word);
}

.word-card-word {
    font-family: var(--font-word);
    font-weight: 600;
    font-size: 1.05rem;
}

.word-card-translation {
    color: var(--text-secondary);
    font-size: 0.85rem;
    line-height: 1.3;
}

.word-card-meta {
    margin-top: auto;
}

.word-card-pos {
    font-size: 0.7rem;
    color: var(--text-secondary);
    background: var(--bg-secondary);
    padding: 0.1rem 0.4rem;
    border-radius: 4px;
}

.word-text {
    font-family: var(--font-word);
    font-weight: 500;
}

.word-article {
    color: var(--accent);
    font-size: 0.85rem;
}

/* Flashcard */
.flashcard-container {
    max-width: 500px;
    margin: 2rem auto;
    text-align: center;
}

.flashcard {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 3rem 2rem;
    min-height: 200px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.3s;
}

.flashcard:hover {
    border-color: var(--accent);
}

.flashcard-word {
    font-family: var(--font-word);
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.flashcard-article {
    color: var(--accent);
    font-size: 1.1rem;
    margin-bottom: 1rem;
}

.flashcard-translation {
    font-size: 1.25rem;
    color: var(--text-secondary);
}

.flashcard-example {
    font-size: 0.95rem;
    color: var(--text-secondary);
    margin-top: 1rem;
    font-style: italic;
}

.flashcard-actions {
    display: flex;
    gap: 0.75rem;
    margin-top: 1.5rem;
    justify-content: center;
}

.btn-rate {
    padding: 0.5rem 1.25rem;
    border-radius: 8px;
    border: 1px solid var(--border);
    background: var(--bg-secondary);
    color: var(--text);
    cursor: pointer;
    font-size: 0.9rem;
    transition: all 0.2s;
}

.btn-rate:hover {
    border-color: var(--accent);
}

.btn-rate.correct {
    border-color: var(--success);
    color: var(--success);
}

.btn-rate.hard {
    border-color: var(--warning);
    color: var(--warning);
}

.btn-rate.wrong {
    border-color: var(--error);
    color: var(--error);
}

.btn-audio {
    background: none;
    border: 1px solid var(--border);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--text-secondary);
    transition: all 0.2s;
    font-size: 1.1rem;
}

.btn-audio:hover {
    border-color: var(--accent);
    color: var(--accent);
}

.btn-audio-small {
    background: none;
    border: 1px solid var(--border);
    border-radius: 50%;
    width: 28px;
    height: 28px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--text-secondary);
    transition: all 0.2s;
    font-size: 0.75rem;
    margin-right: 0.5rem;
    vertical-align: middle;
    flex-shrink: 0;
}

.btn-audio-small:hover {
    border-color: var(--accent);
    color: var(--accent);
}

/* Flashcard controls */
.flashcard-controls {
    display: flex;
    gap: 0.75rem;
    margin-bottom: 1rem;
    justify-content: center;
}

.flashcard-controls select {
    padding: 0.5rem 0.75rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text);
    font-size: 0.9rem;
    font-family: var(--font-ui);
}

.flashcard-remaining {
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.85rem;
    margin-bottom: 1rem;
}

.flashcard-hint {
    color: var(--text-secondary);
    font-size: 0.85rem;
    margin-top: 1rem;
}

.flashcard-mode-badge {
    color: var(--text-secondary);
    font-size: 0.8rem;
    margin-bottom: 1rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.flashcard-input-form {
    margin-top: 1.5rem;
    width: 100%;
    max-width: 300px;
}

.flashcard-text-input {
    width: 100%;
    padding: 0.75rem 1rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text);
    font-size: 1.1rem;
    font-family: var(--font-word);
    text-align: center;
}

.flashcard-text-input:focus {
    outline: none;
    border-color: var(--accent);
}

.flashcard-result-word {
    margin: 1rem 0;
}

.flashcard-audio-row {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    justify-content: center;
    margin: 0.75rem 0;
}

.audio-label {
    color: var(--text-secondary);
    font-size: 0.8rem;
}

.flashcard-example-with-audio {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1rem;
    background: var(--bg-secondary);
    border-radius: 8px;
    margin: 0.5rem 0;
    text-align: left;
}

.flashcard-example-with-audio .example-text {
    font-family: var(--font-word);
    font-size: 0.95rem;
    color: var(--text-secondary);
    font-style: italic;
    border-bottom: none;
    padding: 0;
}

.plural-label {
    color: var(--text-secondary);
    font-size: 1rem;
    margin-bottom: 1rem;
    font-family: var(--font-word);
}

/* Word detail */
.word-detail {
    max-width: 600px;
    margin: 0 auto;
}

.back-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    display: inline-block;
    margin-bottom: 1.5rem;
}

.back-link:hover {
    color: var(--accent);
}

.word-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 2rem;
}

.word-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
}

.word-detail-article {
    color: var(--accent);
    font-size: 1.1rem;
}

.word-detail-word {
    font-family: var(--font-word);
    font-size: 2rem;
}

.word-detail-plural {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.word-translations {
    margin-bottom: 1.5rem;
}

.translation {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 0.5rem;
}

.translation-lang {
    background: var(--accent);
    color: white;
    padding: 0.15rem 0.5rem;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 600;
}

.translation-text {
    font-size: 1.1rem;
}

.word-meta {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
}

.meta-item {
    background: var(--bg-secondary);
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.word-examples h3,
.word-related h3 {
    font-size: 1rem;
    margin-bottom: 0.75rem;
    color: var(--text-secondary);
}

.word-examples ul {
    list-style: none;
    padding: 0;
}

.example-text {
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--border);
    font-family: var(--font-word);
    font-size: 0.95rem;
}

.word-related {
    margin-top: 1.5rem;
}

.related-list {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.related-word {
    background: var(--bg-secondary);
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.85rem;
    font-family: var(--font-word);
}

.word-link {
    text-decoration: none;
    color: var(--text);
}

.word-link:hover .word-text {
    color: var(--accent);
}

.word-pos {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.word-theme {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.words-count {
    font-size: 1rem;
    color: var(--text-secondary);
    font-weight: 400;
}

/* Quiz */
.quiz-container {
    max-width: 500px;
    margin: 2rem auto;
    text-align: center;
}

.quiz-container h1 {
    margin-bottom: 0.5rem;
}

.quiz-container p {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

.quiz-question {
    text-align: center;
}

.quiz-progress {
    color: var(--text-secondary);
    font-size: 0.85rem;
    margin-bottom: 1rem;
}

.quiz-prompt {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 2rem;
    margin-bottom: 1.5rem;
}

.quiz-label {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
}

.quiz-word {
    font-family: var(--font-word);
    font-size: 1.75rem;
    font-weight: 700;
}

.quiz-options {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.btn-option {
    padding: 0.75rem 1rem;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text);
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.2s;
    text-align: left;
    font-family: var(--font-ui);
}

.btn-option:hover {
    border-color: var(--accent);
    background: var(--bg-secondary);
}

.quiz-feedback {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 2rem;
    text-align: center;
}

.quiz-correct {
    border: 2px solid var(--success);
}

.quiz-wrong {
    border: 2px solid var(--error);
}

.feedback-icon {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
}

.quiz-correct .feedback-icon {
    color: var(--success);
}

.quiz-wrong .feedback-icon {
    color: var(--error);
}

.feedback-text {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.feedback-word {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.quiz-result {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 2rem;
    margin: 1.5rem 0;
}

.result-score {
    font-family: var(--font-word);
    font-size: 3rem;
    font-weight: 700;
    color: var(--accent);
}

.result-percent {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.result-message {
    font-size: 1.1rem;
}

/* Listening */
.listening-container,
.speaking-container {
    max-width: 500px;
    margin: 2rem auto;
    text-align: center;
}

.listening-container h1,
.speaking-container h1 {
    margin-bottom: 0.5rem;
}

.listening-container p,
.speaking-container p {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

.btn-audio-large {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 1rem 2rem;
    background: var(--bg-card);
    border: 2px solid var(--accent);
    border-radius: var(--radius);
    color: var(--accent);
    font-size: 1.1rem;
    cursor: pointer;
    transition: all 0.2s;
    margin-bottom: 1.5rem;
    font-family: var(--font-ui);
}

.btn-audio-large:hover {
    background: var(--accent);
    color: white;
}

.listening-form {
    text-align: left;
}

.listening-input {
    font-family: var(--font-word);
    font-size: 1.25rem;
    text-align: center;
}

.listening-exercise,
.speaking-exercise {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.listening-result,
.speaking-result {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 2rem;
    text-align: center;
}

.listening-correct-phrase {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin: 1rem 0;
    padding: 0.75rem 1rem;
    background: var(--bg-secondary);
    border-radius: 8px;
    justify-content: center;
}

.phrase-text {
    font-family: var(--font-word);
    font-size: 1.05rem;
}

.listening-word-info {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-top: 0.5rem;
}

.listening-hint {
    margin-top: 1.5rem;
    text-align: left;
}

.listening-hint summary {
    color: var(--text-secondary);
    font-size: 0.85rem;
    cursor: pointer;
}

.hint-content {
    margin-top: 0.5rem;
    padding: 0.5rem 0.75rem;
    background: var(--bg-secondary);
    border-radius: 8px;
    font-family: var(--font-word);
}

.speaking-phrase-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 2rem;
    margin-bottom: 1rem;
}

.speaking-phrase {
    font-family: var(--font-word);
    font-size: 1.35rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
    line-height: 1.5;
}

.speaking-word-hint {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.speaking-compare {
    margin: 1rem 0;
    text-align: left;
}

.compare-row {
    display: flex;
    gap: 0.5rem;
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--border);
    align-items: baseline;
}

.compare-label {
    color: var(--text-secondary);
    font-size: 0.85rem;
    min-width: 80px;
    flex-shrink: 0;
}

.compare-text {
    font-family: var(--font-word);
    font-size: 0.95rem;
}

.speaking-word-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 2rem;
    margin-bottom: 1rem;
}

.speaking-controls {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.75rem;
}

.speaking-status {
    color: var(--text-secondary);
    font-size: 0.9rem;
    min-height: 1.5rem;
}

.similarity-score {
    margin-bottom: 1.5rem;
}

.similarity-value {
    font-family: var(--font-word);
    font-size: 3rem;
    font-weight: 700;
    color: var(--accent);
}

.similarity-label {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Articles */
.articles-container {
    max-width: 500px;
    margin: 2rem auto;
    text-align: center;
}

.articles-container h1 {
    margin-bottom: 0.5rem;
}

.articles-container p {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

.articles-score {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

.article-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 2.5rem 2rem;
    text-align: center;
}

.article-word {
    font-family: var(--font-word);
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.article-hint {
    color: var(--text-secondary);
    font-size: 1rem;
    margin-bottom: 2rem;
}

.article-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
}

.btn-article {
    padding: 1rem 2rem;
    border-radius: var(--radius);
    border: 2px solid var(--border);
    background: var(--bg-secondary);
    font-size: 1.25rem;
    font-weight: 700;
    font-family: var(--font-word);
    cursor: pointer;
    transition: all 0.2s;
    min-width: 80px;
}

.btn-der {
    color: #3b82f6;
}

.btn-der:hover {
    border-color: #3b82f6;
    background: rgba(59, 130, 246, 0.1);
}

.btn-die {
    color: #ef4444;
}

.btn-die:hover {
    border-color: #ef4444;
    background: rgba(239, 68, 68, 0.1);
}

.btn-das {
    color: #22c55e;
}

.btn-das:hover {
    border-color: #22c55e;
    background: rgba(34, 197, 94, 0.1);
}

.article-result {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 2rem;
    text-align: center;
}

.article-answer {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    margin: 1rem 0;
}

.article-correct-badge {
    font-size: 1.25rem;
    font-weight: 700;
    font-family: var(--font-word);
    padding: 0.25rem 0.75rem;
    border-radius: 8px;
}

.color-der {
    color: #3b82f6;
    background: rgba(59, 130, 246, 0.15);
}

.color-die {
    color: #ef4444;
    background: rgba(239, 68, 68, 0.15);
}

.color-das {
    color: #22c55e;
    background: rgba(34, 197, 94, 0.15);
}

.article-answer-word {
    font-family: var(--font-word);
    font-size: 1.5rem;
    font-weight: 600;
}

.article-plural {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
}

/* Plural */
.plural-container {
    max-width: 500px;
    margin: 2rem auto;
    text-align: center;
}

.plural-container h1 {
    margin-bottom: 0.5rem;
}

.plural-container p {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

.plural-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 2.5rem 2rem;
    text-align: center;
}

.plural-singular {
    margin-bottom: 0.5rem;
}

.plural-article {
    color: var(--accent);
    font-size: 1.1rem;
    font-family: var(--font-word);
    margin-right: 0.25rem;
}

.plural-word {
    font-family: var(--font-word);
    font-size: 2.25rem;
    font-weight: 700;
}

.plural-translation {
    color: var(--text-secondary);
    font-size: 1rem;
    margin-bottom: 2rem;
}

.plural-form {
    text-align: center;
}

.plural-input-group {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 1rem;
    justify-content: center;
}

.plural-die {
    font-family: var(--font-word);
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--accent);
}

.plural-input {
    font-family: var(--font-word);
    font-size: 1.25rem;
    text-align: center;
    max-width: 280px;
    padding: 0.625rem 0.875rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text);
}

.plural-input:focus {
    outline: none;
    border-color: var(--accent);
}

.plural-result {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 2rem;
    text-align: center;
}

.plural-user-answer {
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.plural-correct-answer {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    margin: 1.25rem 0;
    flex-wrap: wrap;
}

.plural-singular-small {
    font-family: var(--font-word);
    font-size: 1.1rem;
}

.plural-arrow {
    color: var(--text-secondary);
    font-size: 1.25rem;
}

.plural-plural-form {
    font-family: var(--font-word);
    font-size: 1.1rem;
}

.plural-die-badge {
    color: var(--accent);
    font-weight: 600;
    margin-right: 0.25rem;
}

.plural-correct-word {
    font-weight: 700;
    color: var(--success);
}

.plural-pattern {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
}

.plural-pattern code {
    background: var(--bg-secondary);
    padding: 0.15rem 0.5rem;
    border-radius: 4px;
    font-family: var(--font-word);
}

.plural-options {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.btn-plural-option {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.875rem 1rem;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text);
    cursor: pointer;
    transition: all 0.2s;
    text-align: left;
    font-family: var(--font-ui);
    gap: 0.75rem;
}

.btn-plural-option:hover {
    border-color: var(--accent);
    background: var(--bg-secondary);
}

.plural-opt-label {
    font-family: var(--font-word);
    font-weight: 700;
    font-size: 1.1rem;
    color: var(--accent);
    min-width: 80px;
}

.plural-opt-example {
    font-size: 0.85rem;
    color: var(--text-secondary);
    text-align: right;
}

.plural-pattern-inline {
    color: var(--text-secondary);
    font-size: 0.85rem;
    margin-left: 0.5rem;
}

/* Responsive */
@media (max-width: 640px) {
    main {
        padding: 1rem 0.75rem;
    }

    .flashcard {
        padding: 2rem 1.5rem;
    }

    .flashcard-word {
        font-size: 1.5rem;
    }

    .stats-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 0.5rem;
    }

    .stat-card {
        padding: 0.75rem 0.5rem;
    }

    .stat-value {
        font-size: 1.5rem;
    }

    .stat-label {
        font-size: 0.7rem;
    }

    .practice-grid {
        grid-template-columns: 1fr;
    }

    .words-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 0.5rem;
    }

    .word-card-item {
        padding: 0.75rem;
    }

    .word-card-word {
        font-size: 0.95rem;
    }
}