/* ===== Reset cơ bản ===== */
html, body {
    margin: 0;
    padding: 0;
    font-family: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    line-height: 1.5;
    background-color: #fafafa;
    color: #333;
}

/* ===== Container chính ===== */
.container {
    max-width: 960px;
    margin: 0 auto;
    padding: 16px;
}

/* ===== Topbar ===== */
.topbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    padding: 12px 16px;
    border-bottom: 1px solid #eee;
    background-color: #fff;
}

.brand {
    text-decoration: none;
    font-weight: 700;
    font-size: 1.5rem;
    color: #111;
}

/* ===== Form tìm kiếm ===== */
.search-form {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    margin-top: 8px;
}

.search-form input,
.search-form select {
    padding: 8px;
    font-size: 16px;
    min-width: 200px;
    border: 1px solid #ccc;
    border-radius: 4px;
    flex: 1 1 auto;
}

/* ===== Nội dung ===== */
.content img {
    max-width: 100%;
    height: auto;
    display: block;
    margin: 16px 0;
}

.content table {
    width: 100%;
    overflow-x: auto;
    display: block;
    border-collapse: collapse;
    margin: 16px 0;
}

.content table th,
.content table td {
    padding: 8px;
    border: 1px solid #ddd;
    text-align: left;
}

/* ===== Responsive cho Mobile ===== */
@media (max-width: 600px) {
    .topbar {
        flex-direction: column;
        align-items: flex-start;
        gap: 8px;
    }

    .search-form input,
    .search-form select {
        min-width: 100%;
    }

    .brand {
        font-size: 1.3rem;
    }
}