/* ===== Biến màu chính - Dễ tùy chỉnh ===== */
:root {
    --bg-body: #0f0a05;
    --bg-primary: #1a1210;
    --bg-secondary: #221a15;
    --bg-navbar: rgba(34, 26, 21, 0.85);
    --bg-container: linear-gradient(135deg, rgba(26, 18, 16, 0.95), rgba(15, 10, 5, 0.98));
    --text-primary: #f0f0f0;
    --text-secondary: #cccccc;
    --accent-gold: #ffd700;
    --accent-gold-hover: #ffed4e;
    --accent-glow: rgba(255, 215, 0, 0.3);
    --border-color: #4a3c2b;
    --shadow-soft: 0 8px 24px rgba(0, 0, 0, 0.4);
    --shadow-glow: 0 0 20px rgba(255, 215, 0, 0.15);
    --transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ===== Reset & Font ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    background: url('https://www.volamcaychay.fun/image/bg-download.jpg') no-repeat center center fixed;
    background-size: cover;
    font-family: 'Roboto', 'Segoe UI', Arial, sans-serif;
    color: var(--text-primary);
    line-height: 1.7;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    overflow-x: hidden;
}

/* ===== Navbar & Menu Icon ===== */
.menu-icon {
    display: none;
    position: fixed;
    top: 20px;
    left: 20px;
    font-size: 28px;
    color: var(--accent-gold);
    cursor: pointer;
    z-index: 1001;
    transition: var(--transition);
}

.menu-icon:hover {
    transform: rotate(90deg) scale(1.1);
    color: var(--accent-gold-hover);
}

.navbar {
    position: fixed;
    top: 20px;
    left: 20px;
    width: 240px;
    height: calc(100vh - 40px);
    background: var(--bg-navbar);
    backdrop-filter: blur(10px);
    border: 1px solid var(--accent-gold);
    border-radius: 16px;
    box-shadow: var(--shadow-soft), inset 0 0 12px var(--accent-glow);
    padding: 30px 0;
    z-index: 1000;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    transition: var(--transition);
}

.navbar li {
    list-style: none;
    width: 100%;
    text-align: center;
    margin: 12px 0;
}

.navbar a {
    display: flex;
    align-items: center;
    justify-content: flex-start;
    padding: 14px 24px;
    color: var(--text-primary);
    text-decoration: none;
    font-size: 17px;
    font-weight: 500;
    border-radius: 8px;
    transition: var(--transition);
}

.navbar a i {
    margin-right: 14px;
    font-size: 20px;
    color: var(--accent-gold);
    transition: var(--transition);
}

.navbar a:hover {
    background: rgba(255, 215, 0, 0.15);
    color: var(--accent-gold-hover);
    transform: translateX(8px);
    box-shadow: 0 4px 12px var(--accent-glow);
}

.navbar a:hover i {
    color: var(--accent-gold-hover);
    transform: scale(1.2);
}

/* ===== Container chính ===== */
.container {
    margin: 80px auto 60px;
    max-width: 1200px;
    padding: 40px;
    background: var(--bg-container);
    border-radius: 20px;
    box-shadow: var(--shadow-soft), var(--shadow-glow);
    flex: 1;
    backdrop-filter: blur(5px);
}

/* ===== Tiêu đề ===== */
h1, h2 {
    color: var(--accent-gold);
    text-align: center;
    margin-bottom: 30px;
    letter-spacing: 1.2px;
    text-shadow: 0 0 12px rgba(255, 215, 0, 0.4);
}

h1 {
    font-size: 36px;
}

h2 {
    font-size: 28px;
    position: relative;
    padding-bottom: 12px;
}

h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 100px;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--accent-gold), transparent);
}

/* ===== Văn bản & Danh sách ===== */
p {
    font-size: 16px;
    margin: 16px 0;
    color: var(--text-secondary);
}

ul {
    list-style: none;
}

ul li {
    margin: 16px 0;
    padding-left: 36px;
    position: relative;
    font-size: 16px;
}

ul li i {
    position: absolute;
    left: 0;
    color: var(--accent-gold);
    font-size: 20px;
}

/* ===== Nút CTA ===== */
.button {
    display: inline-flex;
    align-items: center;
    padding: 12px 28px;
    background: linear-gradient(45deg, var(--accent-gold), var(--accent-gold-hover));
    color: #1a0f07;
    text-decoration: none;
    border-radius: 50px;
    font-weight: 600;
    font-size: 15px;
    margin: 12px;
    transition: var(--transition);
    box-shadow: 0 6px 16px var(--accent-glow);
}

.button i {
    margin-right: 10px;
    font-size: 18px;
}

.button:hover {
    transform: translateY(-4px) scale(1.05);
    box-shadow: 0 12px 24px var(--accent-glow);
    background: linear-gradient(45deg, var(--accent-gold-hover), #fff000);
}

/* ===== Hình ảnh ===== */
.bbImage {
    max-width: 100%;
    border-radius: 16px;
    margin: 30px 0;
    border: 2px solid var(--border-color);
    box-shadow: var(--shadow-soft);
    transition: var(--transition);
}

.bbImage:hover {
    transform: scale(1.03);
    box-shadow: var(--shadow-glow);
}

/* ===== Bảng VIP - Hiện đại & Sang trọng ===== */
table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
    margin: 40px 0;
    border-radius: 16px;
    overflow: hidden;
    background: var(--bg-secondary);
    box-shadow: var(--shadow-soft);
}

th {
    background: linear-gradient(90deg, #c79900, #ffbd33);
    color: #1a0f07;
    padding: 18px;
    text-transform: uppercase;
    font-size: 15px;
    letter-spacing: 1px;
    font-weight: 700;
    text-shadow: 0 1px 2px rgba(0,0,0,0.3);
}

td {
    padding: 18px 16px;
    border-bottom: 1px solid rgba(255, 215, 0, 0.1);
    font-size: 15px;
    color: var(--text-secondary);
}

tr:nth-child(even) td {
    background: rgba(255, 215, 0, 0.05);
}

tr:hover td {
    background: rgba(255, 215, 0, 0.2);
    transition: var(--transition);
}

td:first-child {
    text-align: center;
    font-weight: bold;
    color: var(--accent-gold);
    font-size: 18px;
}

td:nth-child(2) {
    text-align: center;
    color: #00e5ff;
    font-weight: 600;
}

/* ===== Footer ===== */
.footer {
    text-align: center;
    padding: 30px;
    margin-top: auto;
    color: var(--text-secondary);
}

.footer p {
    margin: 10px 0;
    font-size: 14px;
}

.footer a {
    color: var(--accent-gold);
    text-decoration: none;
    transition: var(--transition);
}

.footer a:hover {
    color: var(--accent-gold-hover);
    text-shadow: 0 0 8px var(--accent-glow);
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
    .menu-icon {
        display: block;
    }

    .navbar {
        width: 100%;
        height: 100vh;
        top: 0;
        left: 0;
        border-radius: 0;
        transform: translateX(-100%);
        padding: 100px 0 40px;
    }

    .navbar.show {
        transform: translateX(0);
    }

    .container {
        margin: 80px 15px 30px;
        padding: 25px;
    }

    h1 { font-size: 28px; }
    h2 { font-size: 24px; }
    table th, table td { padding: 12px; font-size: 14px; }
}

@media (min-width: 769px) and (max-width: 1024px) {
    .navbar {
        width: 220px;
    }

    .container {
        margin-left: 260px;
        max-width: calc(100% - 280px);
    }
}