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

:root {
    --tg-theme-bg-color: #ffffff;
    --tg-theme-text-color: #000000;
    --tg-theme-hint-color: #999999;
    --tg-theme-link-color: #2481cc;
    --tg-theme-button-color: #2481cc;
    --tg-theme-button-text-color: #ffffff;
    --tg-theme-secondary-bg-color: #f4f4f5;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--tg-theme-bg-color);
    color: var(--tg-theme-text-color);
    margin: 0;
    padding: 0;
    min-height: 100vh;
}

.container {
    max-width: 100%;
    margin: 0 auto;
    padding: 16px;
}

header {
    text-align: center;
    margin-bottom: 24px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--tg-theme-hint-color);
}

header h1 {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--tg-theme-text-color);
}

.subtitle {
    font-size: 14px;
    color: var(--tg-theme-hint-color);
}

.calendar-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
    margin-bottom: 20px;
}

.month-card {
    background: var(--tg-theme-secondary-bg-color);
    border-radius: 12px;
    padding: 20px 12px;
    text-align: center;
    cursor: pointer;
    transition: all 0.2s ease;
    border: 2px solid transparent;
    position: relative;
    overflow: hidden;
}

.month-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.month-card:active {
    transform: translateY(0);
}

.month-card.has-content::after {
    content: '•';
    position: absolute;
    top: 8px;
    right: 12px;
    color: var(--tg-theme-button-color);
    font-size: 20px;
}

.month-number {
    font-size: 32px;
    font-weight: 700;
    color: var(--tg-theme-button-color);
    margin-bottom: 4px;
}

.month-name {
    font-size: 13px;
    font-weight: 500;
    color: var(--tg-theme-text-color);
}

/* Стили для категорий */
.category-icon {
    font-size: 36px;
    margin-bottom: 8px;
}

.category-name {
    font-size: 12px;
    font-weight: 500;
    color: var(--tg-theme-text-color);
    line-height: 1.3;
}

/* Пустые категории */
.empty-category {
    opacity: 0.3;
    cursor: default;
    pointer-events: none;
}

.empty-category:hover {
    transform: none;
    box-shadow: none;
}

/* Стили для подкатегорий */
.subcategory-card {
    display: flex;
    align-items: center;
    gap: 12px;
}

.subcategory-icon {
    font-size: 28px;
    flex-shrink: 0;
}

.subcategory-card h3 {
    margin-bottom: 0;
}

.month-content,
.topic-detail {
    animation: slideIn 0.3s ease;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.back-button {
    background: var(--tg-theme-secondary-bg-color);
    border: none;
    border-radius: 8px;
    padding: 10px 16px;
    font-size: 14px;
    font-weight: 500;
    color: var(--tg-theme-link-color);
    cursor: pointer;
    margin-bottom: 16px;
    display: inline-block;
    transition: all 0.2s ease;
}

.back-button:hover {
    background: var(--tg-theme-hint-color);
}

.back-button:active {
    transform: scale(0.98);
}

#monthTitle,
#topicTitle {
    font-size: 22px;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--tg-theme-text-color);
}

.topics-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.topic-card {
    background: var(--tg-theme-secondary-bg-color);
    border-radius: 10px;
    padding: 16px;
    cursor: pointer;
    transition: all 0.2s ease;
    border-left: 4px solid var(--tg-theme-button-color);
}

.topic-card:hover {
    background: var(--tg-theme-hint-color);
    transform: translateX(4px);
}

.topic-card:active {
    transform: translateX(2px);
}

.topic-card h3 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 4px;
    color: var(--tg-theme-text-color);
}

.topic-card p {
    font-size: 13px;
    color: var(--tg-theme-hint-color);
}

.topic-content {
    line-height: 1.6;
    font-size: 15px;
}

.topic-content h3 {
    margin-top: 20px;
    margin-bottom: 12px;
    font-size: 18px;
    font-weight: 600;
}

.topic-content p {
    margin-bottom: 12px;
}

.topic-content ul,
.topic-content ol {
    margin-left: 20px;
    margin-bottom: 12px;
}

.topic-content li {
    margin-bottom: 8px;
}

.empty-state {
    text-align: center;
    padding: 40px 20px;
    color: var(--tg-theme-hint-color);
}

.empty-state-icon {
    font-size: 48px;
    margin-bottom: 12px;
}

.empty-state-text {
    font-size: 16px;
}

/* Адаптация под темную тему Telegram */
@media (prefers-color-scheme: dark) {
    :root {
        --tg-theme-bg-color: #212121;
        --tg-theme-text-color: #ffffff;
        --tg-theme-hint-color: #aaaaaa;
        --tg-theme-secondary-bg-color: #2d2d2d;
    }
}