/* --- 1. Thiết lập chung & Biến màu sắc --- */
:root {
    --primary-color: #2c2c2c;
    --accent-color: #8c3b28;
    --bg-color: #fcfbfa;
    --card-bg: #ffffff;
    --text-color: #333333;
    --light-gray: #e0e0e0;
    --border-radius: 8px;
}

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

body {
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
}

/* --- 2. Header & Navigation (Thanh điều hướng) --- */
.site-header {
    background-color: var(--primary-color);
    color: #ffffff;
    padding: 2.5rem 1rem;
    text-align: center;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.site-header .site-name {
    color: #ffffff;
    font-size: 2.4rem;
    font-weight: 700;
    text-decoration: none;
    letter-spacing: 1.5px;
}

.site-header .tagline {
    font-style: italic;
    color: #b0b0b0;
    margin-top: 0.4rem;
    margin-bottom: 1.5rem;
    font-size: 1.05rem;
}

.main-nav ul {
    list-style: none;
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 1.8rem;
}

.main-nav a {
    color: #ffffff;
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    transition: color 0.2s ease;
    padding-bottom: 3px;
    border-bottom: 2px solid transparent;
}

.main-nav a:hover {
    color: var(--accent-color);
    border-bottom-color: var(--accent-color);
}

/* --- 3. Bố cục tổng thể (Layout Responsive - Chia cột Grid) --- */
.layout {
    max-width: 1200px;
    margin: 2.5rem auto;
    padding: 0 1.5rem;
    display: grid;
    grid-template-columns: 1fr;
    gap: 2.5rem;
}

/* Responsive cho màn hình từ máy tính bảng trở lên (Tablet & Desktop) */
@media (min-width: 768px) {
    .layout {
        grid-template-columns: 3fr 1fr; /* Chia phần Main chiếm 3 phần, Sidebar chiếm 1 phần */
    }
}

/* --- 4. Nội dung bài viết & Các khối Section --- */
main article, main section {
    background: var(--card-bg);
    padding: 2.2rem;
    margin-bottom: 2.2rem;
    border-radius: var(--border-radius);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.04);
    border: 1px solid rgba(0, 0, 0, 0.03);
}

h1, h2 {
    color: var(--primary-color);
    margin-bottom: 1.2rem;
}

h1 {
    font-size: 1.9rem;
    font-weight: 700;
}

h2 {
    font-size: 1.4rem;
    border-bottom: 2px solid var(--light-gray);
    padding-bottom: 0.6rem;
}

p {
    margin-bottom: 1rem;
    color: #444;
}

figure {
    margin: 1.5rem 0;
    text-align: center;
}

figure img {
    max-width: 100%;
    height: auto;
    border-radius: var(--border-radius);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

figcaption {
    font-size: 0.88rem;
    color: #666;
    margin-top: 0.6rem;
    font-style: italic;
}

/* --- 5. Danh sách giá trị cốt lõi (Grid Responsive) --- */
.value-list {
    list-style: none;
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.2rem;
    margin-top: 1.2rem;
}

@media (min-width: 600px) {
    .value-list {
        grid-template-columns: repeat(3, 1fr); /* 3 cột trên màn hình rộng */
    }
}

.value-card {
    background: #fdfbfb;
    padding: 1.5rem;
    border-radius: var(--border-radius);
    border-left: 4px solid var(--accent-color);
    border-top: 1px solid var(--light-gray);
    border-right: 1px solid var(--light-gray);
    border-bottom: 1px solid var(--light-gray);
}

.value-card h3 {
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
    color: var(--primary-color);
}

.value-card p {
    font-size: 0.92rem;
    margin-bottom: 0;
    color: #555;
}

/* --- 6. Danh sách đội ngũ (Team Responsive) --- */
.team-list {
    list-style: none;
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
    margin-top: 1.2rem;
}

@media (min-width: 600px) {
    .team-list {
        grid-template-columns: repeat(3, 1fr); /* 3 cột chia đều cho 3 thành viên */
    }
}

.member {
    text-align: center;
    background: #fdfdfd;
    padding: 1.5rem 1rem;
    border-radius: var(--border-radius);
    border: 1px solid var(--light-gray);
    transition: transform 0.2s ease;
}

.member:hover {
    transform: translateY(-4px);
    box-shadow: 0 6px 15px rgba(0, 0, 0, 0.06);
}

.member img {
    width: 100px;
    height: 100px;
    object-fit: cover;
    border-radius: 50%; /* Bo tròn ảnh thành viên */
    margin-bottom: 0.9rem;
    border: 3px solid var(--accent-color);
}

.member h3 {
    font-size: 1.05rem;
    margin-bottom: 0.3rem;
}

.member p {
    font-size: 0.85rem;
    color: #666;
    margin-bottom: 0;
}

/* --- 7. Form liên hệ --- */
.contact-form p {
    margin-bottom: 1.2rem;
}

.contact-form label {
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--primary-color);
}

.contact-form input,
.contact-form textarea {
    width: 100%;
    padding: 0.85rem;
    margin-top: 0.4rem;
    border: 1px solid var(--light-gray);
    border-radius: var(--border-radius);
    font-family: inherit;
    font-size: 0.95rem;
    background-color: #fff;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.contact-form input:focus,
.contact-form textarea:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(140, 59, 40, 0.1);
}

.contact-form button {
    background-color: var(--accent-color);
    color: #ffffff;
    border: none;
    padding: 0.9rem 1.8rem;
    font-size: 1rem;
    font-weight: 600;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: background-color 0.2s ease;
    width: 100%;
}

@media (min-width: 500px) {
    .contact-form button {
        width: auto;
    }
}

.contact-form button:hover {
    background-color: #6f2d1e;
}

/* --- 8. Sidebar --- */
.sidebar {
    background: var(--card-bg);
    padding: 1.8rem;
    border-radius: var(--border-radius);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.04);
    height: fit-content;
    border: 1px solid rgba(0, 0, 0, 0.03);
}

.sidebar h2 {
    font-size: 1.2rem;
    margin-bottom: 1rem;
}

.sidebar ul.recent {
    list-style: none;
    margin-bottom: 1.5rem;
}

.sidebar ul.recent li {
    margin-bottom: 0.9rem;
    padding-bottom: 0.7rem;
    border-bottom: 1px dashed var(--light-gray);
}

.sidebar ul.recent a {
    color: var(--text-color);
    text-decoration: none;
    font-size: 0.93rem;
    transition: color 0.2s ease;
}

.sidebar ul.recent a:hover {
    color: var(--accent-color);
}

.sidebar p {
    font-size: 0.92rem;
}

.sidebar p a {
    color: var(--accent-color);
    font-weight: 600;
    text-decoration: none;
}

.sidebar p a:hover {
    text-decoration: underline;
}

/* --- 9. Footer (Chân trang) --- */
.site-footer {
    background-color: var(--primary-color);
    color: #ffffff;
    padding: 3.5rem 1.5rem 1.8rem;
    margin-top: 4rem;
}

.footer-cols {
    max-width: 1200px;
    margin: 0 auto;
    list-style: none;
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
}

@media (min-width: 768px) {
    .footer-cols {
        grid-template-columns: repeat(4, 1fr); /* 4 cột cân đối ở footer trên desktop */
    }
}

.footer-cols h3 {
    font-size: 1.05rem;
    margin-bottom: 0.8rem;
    color: #ffccbc;
}

.footer-cols p {
    font-size: 0.9rem;
    color: #ccc;
    margin-bottom: 0;
}

.copyright {
    text-align: center;
    border-top: 1px solid #444;
    margin-top: 2.5rem;
    padding-top: 1.5rem;
    color: #888;
    font-size: 0.88rem;
}