/* --- Core System Reset --- */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: "Helvetica Neue", Arial, sans-serif;
    background-color: #1a1a1a;
    color: #ffffff;
    padding: 40px 20px;
    display: flex;
    justify-content: center;
}

/* --- Khung Bauhaus ngoài cùng (Link 2) --- */
.bauhaus-frame {
    width: 100%;
    max-width: 1000px;
    border: 6px solid #ff3b30;
    background-color: #111111;
    position: relative;
}

/* --- Navigation & Header (Link 2) --- */
.main-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 6px solid #ff3b30;
    background-color: #151515;
}

.logo {
    font-size: 22px;
    font-weight: 900;
    text-transform: uppercase;
    letter-spacing: -1px;
    padding: 20px;
    color: #ffffff;
    border-right: 6px solid #ff3b30;
}

.flex-nav ul {
    display: flex;
    list-style: none;
    height: 100%;
}

.flex-nav li {
    border-left: 6px solid #ff3b30;
}

.flex-nav a {
    display: block;
    padding: 24px 30px;
    text-decoration: none;
    color: #cccccc;
    font-weight: bold;
    text-transform: uppercase;
    transition: all 0.15s ease;
}

.flex-nav a:hover, 
.flex-nav a.active {
    background-color: #ff3b30;
    color: #ffffff;
}

/* --- Intro Text Section --- */
.intro-block {
    padding: 40px;
    border-bottom: 6px solid #ff3b30;
}

.intro-block h2 {
    font-size: 38px;
    text-transform: uppercase;
    font-weight: 800;
    color: #ffcc00;
    margin-bottom: 10px;
}

.intro-block .subtitle {
    font-size: 15px;
    color: #bbbbbb;
}

/* --- Cấu trúc Lưới Grid Gallery (Kết hợp Link 1) --- */
.gallery-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
    padding: 40px;
    border-bottom: 6px solid #ff3b30;
}

.grid-item {
    display: flex;
    flex-direction: column;
    text-decoration: none;
    color: inherit;
    background: #181818;
    border: 4px solid #ffffff; /* Viền trắng dày tạo khối tương phản kiểu Bauhaus */
    overflow: hidden;
    transition: transform 0.2s ease, border-color 0.2s ease;
}

.grid-item:hover {
    transform: translateY(-5px);
    border-color: #ffcc00; /* Đổi màu viền khi hover */
}

/* Thay thế thẻ img bằng block placeholder để bạn dễ chèn ảnh thực tế sau này */
.grid-item .img-placeholder {
    width: 100%;
    height: 180px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    color: #666;
    font-weight: bold;
    text-transform: uppercase;
}

.grid-item .label {
    padding: 15px;
    font-weight: bold;
    text-align: center;
    border-top: 4px solid #ffffff;
    background-color: #151515;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-size: 14px;
}

.grid-item:hover .label {
    border-top-color: #ffcc00;
    color: #ffcc00;
}

/* --- Khối trang trí Danger Stripes (Link 2) --- */
.accent-block {
    height: 50px;
    background-color: #ffcc00;
    border-bottom: 6px solid #ff3b30;
    background-image: linear-gradient(45deg, #111111 25%, transparent 25%, transparent 50%, #111111 50%, #111111 75%, transparent 75%, transparent);
    background-size: 20px 20px;
}

/* --- Footer kết hợp --- */
.main-footer {
    background-color: #111111;
}

.footer-info {
    padding: 30px 40px;
    font-size: 14px;
    line-height: 1.6;
    color: #dddddd;
    border-bottom: 4px solid #ff3b30;
}

.footer-copyright {
    padding: 20px;
    background-color: #ff3b30;
    color: #111111;
    font-size: 12px;
    font-weight: bold;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    text-align: center;
}