/* Базовые переменные для светлой темы */
:root {
    --bg-color: #f8fafc;
    --card-bg: #ffffff;
    --primary: #0284c7;
    --primary-hover: #0369a1;
    --text-main: #1e293b;
    --text-muted: #64748b;
    --border-color: #e2e8f0;
}

/* Переменные для темной темы */
body.dark-theme {
    --bg-color: #0f172a;
    --card-bg: #1e293b;
    --primary: #38bdf8;
    --primary-hover: #7dd3fc;
    --text-main: #f1f5f9;
    --text-muted: #94a3b8;
    --border-color: #334155;
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-main);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    line-height: 1.6;
    transition: background-color 0.3s, color 0.3s;
}

/* Шапка сайта */
.site-header {
    background-color: var(--card-bg);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
    transition: background-color 0.3s, border-color 0.3s;
}

.header-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 15px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 24px;
    font-weight: 800;
    color: var(--text-main);
    text-decoration: none;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.logo span {
    color: var(--primary);
}

.lang-badge {
    font-size: 11px;
    background: var(--primary);
    color: #fff;
    padding: 2px 6px;
    border-radius: 4px;
    vertical-align: middle;
}

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

.nav-link {
    color: var(--text-main);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s;
}

.nav-link:hover {
    color: var(--primary);
}

/* Кнопка смены темы */
.theme-btn {
    background: none;
    border: 1px solid var(--border-color);
    padding: 6px 10px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 16px;
    transition: background-color 0.2s;
}

.theme-btn:hover {
    background-color: var(--bg-color);
}

/* Двухколоночный макет */
.main-layout {
    max-width: 1200px;
    margin: 40px auto;
    padding: 0 20px;
    display: grid;
    grid-template-columns: 3fr 1fr;
    gap: 30px;
}

/* Карточки и теги */
.card-tag {
    display: inline-block;
    background-color: rgba(2, 132, 199, 0.1);
    color: var(--primary);
    font-size: 11px;
    font-weight: 700;
    padding: 4px 8px;
    border-radius: 4px;
    text-transform: uppercase;
    margin-bottom: 12px;
}

body.dark-theme .card-tag {
    background-color: rgba(56, 189, 248, 0.15);
}

.card-title a {
    color: var(--text-main);
    text-decoration: none;
    transition: color 0.2s;
}

.card-title a:hover {
    color: var(--primary);
}

.card-excerpt {
    color: var(--text-muted);
    margin: 10px 0 15px 0;
    font-size: 15px;
}

.card-meta {
    font-size: 13px;
    color: var(--text-muted);
}

/* Главный пост */
.featured-card {
    background-color: var(--card-bg);
    padding: 35px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    margin-bottom: 30px;
    transition: background-color 0.3s, border-color 0.3s;
}

.featured-card .card-title {
    font-size: 28px;
    margin-bottom: 10px;
}

/* Сетка остальных постов */
.posts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 20px;
}

.post-card {
    background-color: var(--card-bg);
    padding: 25px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    transition: transform 0.2s, box-shadow 0.2s, background-color 0.3s, border-color 0.3s;
}

.post-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 24px rgba(0,0,0,0.08);
}

/* Боковая панель */
.sidebar {
    display: flex;
    flex-direction: column;
    gap: 30px;
}

.widget {
    background-color: var(--card-bg);
    padding: 25px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    transition: background-color 0.3s, border-color 0.3s;
}

.widget-title {
    font-size: 15px;
    margin-bottom: 15px;
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 8px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.widget-links {
    list-style: none;
}

.widget-links li {
    margin-bottom: 12px;
}

.widget-links a {
    color: var(--text-main);
    text-decoration: none;
    font-size: 14px;
    transition: color 0.2s;
}

.widget-links a:hover {
    color: var(--primary);
}

/* Подписка */
.subscribe-form {
    display: flex;
    margin-top: 15px;
}

.subscribe-form input {
    flex: 1;
    padding: 10px 12px;
    border: 1px solid var(--border-color);
    border-radius: 6px 0 0 6px;
    outline: none;
    background-color: var(--bg-color);
    color: var(--text-main);
}

.subscribe-form button {
    background-color: var(--primary);
    color: white;
    border: none;
    padding: 0 18px;
    border-radius: 0 6px 6px 0;
    cursor: pointer;
    font-weight: bold;
    transition: background-color 0.2s;
}

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

/* Подвал */
.site-footer {
    text-align: center;
    padding: 40px 20px;
    margin-top: 60px;
    border-top: 1px solid var(--border-color);
    color: var(--text-muted);
    font-size: 14px;
    transition: border-color 0.3s;
}

/* Адаптивность */
@media (max-width: 900px) {
    .main-layout {
        grid-template-columns: 1fr;
    }
    .header-container {
        flex-direction: column;
        gap: 15px;
    }
}