:root {
    --color-bg: #f7f5f0;
    --color-surface: #ffffff;
    --color-text: #2b2b2b;
    --color-primary: #2f6f4f;
    --color-primary-dark: #234f38;
    --color-border: #e2ddd2;
    --color-success: #2f6f4f;
    --color-error: #b3413a;
    --radius: 12px;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.5;
}

.app-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 1rem;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 10;
}

.app-header__brand {
    font-weight: 700;
    font-size: 1.1rem;
    color: var(--color-primary-dark);
    text-decoration: none;
}

.app-header__user {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.9rem;
}

.avatar {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    border-radius: 50%;
    color: #fff;
    font-weight: 700;
    font-size: 0.85rem;
}

.app-main {
    max-width: 720px;
    margin: 0 auto;
    padding: 1.25rem 1rem 3rem;
}

h1 {
    font-size: 1.5rem;
    margin: 0.5rem 0 1rem;
}

h2 {
    font-size: 1.15rem;
    margin: 1.75rem 0 0.75rem;
}

.card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 1.5rem;
}

.card--narrow {
    max-width: 380px;
    margin: 2rem auto;
}

.form {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

.form label {
    font-size: 0.85rem;
    font-weight: 600;
    margin-top: 0.5rem;
}

.form input {
    padding: 0.65rem 0.75rem;
    border: 1px solid var(--color-border);
    border-radius: 8px;
    font-size: 1rem;
}

.button {
    display: inline-block;
    background: var(--color-primary);
    color: #fff;
    border: none;
    padding: 0.7rem 1.25rem;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    text-decoration: none;
    text-align: center;
    margin-top: 1rem;
}

.button:hover {
    background: var(--color-primary-dark);
}

.button--ghost {
    background: transparent;
    color: var(--color-primary-dark);
    border: 1px solid var(--color-border);
    padding: 0.4rem 0.75rem;
    margin-top: 0;
    font-size: 0.85rem;
}

.alert {
    padding: 0.6rem 0.85rem;
    border-radius: 8px;
    font-size: 0.9rem;
}

.alert--error {
    background: #fbeceb;
    color: var(--color-error);
    border: 1px solid #f1c7c4;
}

.back-link {
    display: inline-block;
    margin-bottom: 0.5rem;
    color: var(--color-primary-dark);
    text-decoration: none;
    font-size: 0.9rem;
}

.games-row {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.6rem;
    margin: 0.75rem 0 0.25rem;
}

.games-row__label {
    font-size: 0.85rem;
    color: #6a6a6a;
    margin-right: 0.25rem;
}

.lesson-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 1rem;
}

.lesson-card {
    display: block;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-left: 4px solid var(--color-border);
    border-radius: var(--radius);
    padding: 1.1rem;
    text-decoration: none;
    color: var(--color-text);
}

.lesson-card h2 {
    margin: 0 0 0.35rem;
    font-size: 1.05rem;
    color: var(--color-text);
}

.lesson-card p {
    margin: 0 0 0.75rem;
    font-size: 0.9rem;
    color: #5a5a5a;
}

.lesson-card--completed {
    border-left-color: var(--color-success);
}

.lesson-card--in_progress {
    border-left-color: #d3a029;
}

.badge {
    display: inline-block;
    font-size: 0.78rem;
    font-weight: 600;
    padding: 0.2rem 0.6rem;
    border-radius: 999px;
    background: var(--color-bg);
    color: #6a6a6a;
}

.vocab-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 0.75rem;
}

.vocab-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 0.85rem;
    display: flex;
    flex-direction: column;
    gap: 0.2rem;
}

.vocab-card__row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.5rem;
}

.vocab-card__de {
    font-weight: 700;
    font-size: 1.05rem;
}

.vocab-card__at {
    color: var(--color-primary-dark);
    font-size: 0.85rem;
    font-weight: 600;
}

.vocab-card__cz {
    color: #3a5f8a;
    font-size: 0.85rem;
    font-weight: 600;
}

.vocab-card__cz--mismatch {
    color: #a8571f;
}

.article {
    display: inline-block;
    font-weight: 700;
    font-size: 0.85rem;
    margin-right: 0.25rem;
    padding: 0 0.35rem;
    border-radius: 4px;
    color: #fff;
}

.article--der {
    background: #2f6f9e;
}

.article--die {
    background: #b3413a;
}

.article--das {
    background: #4a8f52;
}

.vocab-card__note {
    margin: 0.4rem 0 0;
    padding-top: 0.4rem;
    border-top: 1px dashed var(--color-border);
    font-size: 0.8rem;
    color: #6a6a6a;
    line-height: 1.35;
}

.gender-warning {
    flex-shrink: 0;
    font-size: 0.72rem;
    font-weight: 700;
    color: #a8571f;
    background: #fdf0e3;
    border: 1px solid #f0d3ae;
    border-radius: 999px;
    padding: 0.15rem 0.5rem;
    white-space: nowrap;
}

.speak-btn {
    flex-shrink: 0;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    border-radius: 50%;
    border: 1px solid var(--color-border);
    background: var(--color-bg);
    font-size: 0.85rem;
    cursor: pointer;
    padding: 0;
}

.speak-btn:hover {
    background: #eae6da;
}

.speak-btn:disabled {
    opacity: 0.35;
    cursor: not-allowed;
}

.flag {
    font-size: 0.8rem;
    margin-right: 0.15rem;
}

.memory-board {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(90px, 1fr));
    gap: 0.6rem;
    margin: 1.25rem 0 0.75rem;
}

.memory-card {
    aspect-ratio: 1;
    border: none;
    border-radius: 10px;
    background: var(--color-primary);
    color: #fff;
    font-size: 1.5rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0.4rem;
    text-align: center;
    line-height: 1.2;
}

.memory-card:hover:not(:disabled) {
    background: var(--color-primary-dark);
}

.memory-card--revealed {
    background: var(--color-surface);
    color: var(--color-text);
    border: 2px solid var(--color-primary);
    font-size: 0.8rem;
    font-weight: 700;
}

.memory-card--matched {
    background: #e7f3ec;
    color: var(--color-success);
    border: 2px solid var(--color-success);
    font-size: 0.8rem;
    font-weight: 700;
    cursor: default;
    opacity: 0.85;
}

.memory-status {
    font-weight: 600;
    color: var(--color-primary-dark);
    min-height: 1.4rem;
}

.sort-game {
    max-width: 420px;
    margin: 1.25rem auto 0.5rem;
    text-align: center;
}

.sort-progress {
    font-size: 0.85rem;
    color: #6a6a6a;
    margin: 0 0 0.5rem;
}

.sort-word {
    font-size: 2rem;
    font-weight: 700;
    margin: 1rem 0;
    min-height: 2.5rem;
}

.sort-buttons {
    display: flex;
    gap: 0.75rem;
    justify-content: center;
    flex-wrap: wrap;
}

.sort-btn {
    flex: 1;
    min-width: 90px;
    padding: 0.85rem;
    border: none;
    border-radius: 10px;
    color: #fff;
    font-size: 1.1rem;
    font-weight: 700;
    cursor: pointer;
}

.sort-btn:disabled {
    opacity: 0.55;
    cursor: default;
}

.sort-btn--der {
    background: #2f6f9e;
}

.sort-btn--die {
    background: #b3413a;
}

.sort-btn--das {
    background: #4a8f52;
}

.sort-feedback {
    min-height: 3rem;
    margin-top: 1rem;
    font-weight: 600;
    color: var(--color-text);
}

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

.sort-feedback--incorrect {
    color: var(--color-error);
}

.sort-feedback--done {
    font-size: 1.15rem;
    color: var(--color-primary-dark);
}

.vocab-card__en {
    color: #6a6a6a;
    font-size: 0.9rem;
}

.quiz__question {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 1rem;
    margin: 0 0 1rem;
}

.quiz__question legend {
    font-weight: 600;
    padding: 0 0.25rem;
}

.quiz__option {
    display: block;
    padding: 0.4rem 0;
    font-size: 0.95rem;
}

.quiz__option input {
    margin-right: 0.5rem;
}

.quiz-result {
    margin-top: 1rem;
    padding: 0.85rem 1rem;
    border-radius: var(--radius);
    font-weight: 600;
}

.quiz-result--success {
    background: #e7f3ec;
    color: var(--color-success);
}

.quiz-result--retry {
    background: #fdf4e3;
    color: #8a6414;
}

.quiz-result--error {
    background: #fbeceb;
    color: var(--color-error);
}

@media (max-width: 480px) {
    .app-header__user span:not(.avatar) {
        display: none;
    }
}