/* Reset & Global */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    -webkit-tap-highlight-color: transparent;
}

html { scroll-behavior: smooth; }

body {
    min-height: 100vh;
    overflow-x: hidden;
    background-color: var(--bg);
    color: var(--text-main);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    text-rendering: optimizeLegibility;
    -webkit-font-smoothing: antialiased;
}

body.show-bg {
    background-image: linear-gradient(rgba(0,0,0,0.45), rgba(0,0,0,0.6)), url('../assets/img/Theme.webp');
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    background-attachment: fixed;
}

/* Loader */
.loader {
    position: fixed;
    top: 0;
    left: 0;
    height: 2px;
    width: 0;
    background: var(--accent);
    z-index: 9999;
    transition: width 0.25s ease;
}

/* Layout chính */
.main {
    padding: 80px 16px 40px;
    display: flex;
    justify-content: center;
}

/* Grid bài viết - Chế độ lưới ô */
.grid {
    width: 100%;
    max-width: 900px;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    gap: 20px;
}

/* Mobile: Cố định 2 cột cho cân đối */
@media (max-width: 480px) {
    .grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 12px;
    }
}