/* Biến CSS để dễ quản lý màu sắc */
:root {
    --bg-color: #050505;
    --card-bg: #0c0c12;
    --primary: #a855f7; /* Neon Purple */
    --primary-glow: rgba(168, 85, 247, 0.4);
    --secondary: #3b82f6; /* Neon Blue */
    --secondary-glow: rgba(59, 130, 246, 0.4);
    --text-main: #ffffff;
    --text-muted: #a0a0a0;
    --header-h: 80px;
}

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

html {
    scroll-behavior: smooth;
}

body {
    background-color: var(--bg-color);
    color: var(--text-main);
    font-family: 'Inter', sans-serif;
    line-height: 1.6;
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Typography */
.font-cyber {
    font-family: 'Orbitron', sans-serif;
}

.gradient-text {
    background: linear-gradient(90deg, var(--primary), var(--secondary), var(--primary));
    background-size: 200% auto;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    animation: shine 3s linear infinite;
    font-family: 'Orbitron', sans-serif;
}

@keyframes shine {
    to { background-position: 200% center; }
}

/* Header */
header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--header-h);
    background: rgba(0, 0, 0, 0.85);
    backdrop-filter: blur(15px);
    z-index: 1000;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 100%;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    cursor: pointer;
}

.logo-box {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border-radius: 8px;
    display: flex;
    justify-content: center;
    align-items: center;
    font-weight: 900;
    font-family: 'Orbitron', sans-serif;
    box-shadow: 0 0 15px var(--primary-glow);
}

.logo-text {
    font-family: 'Orbitron', sans-serif;
    font-weight: 700;
    font-size: 1.2rem;
    letter-spacing: -1px;
}

.logo-text .highlight {
    color: var(--primary);
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 30px;
}

.nav-item {
    text-decoration: none;
    color: var(--text-muted);
    font-family: 'Orbitron', sans-serif;
    font-size: 0.85rem;
    font-weight: 400;
    text-transform: uppercase;
    letter-spacing: 1px;
    transition: all 0.3s ease;
    position: relative;
}

.nav-item:hover, .nav-item.active {
    color: var(--primary);
    text-shadow: 0 0 8px var(--primary-glow);
}

.nav-item.active::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 0;
    width: 100%;
    height: 2px;
    background: var(--primary);
    box-shadow: 0 0 10px var(--primary);
}

.contact-link {
    color: var(--secondary) !important;
}

.btn-buy-now {
    background: linear-gradient(90deg, var(--primary), #8b5cf6);
    border: none;
    color: white;
    padding: 10px 24px;
    border-radius: 50px;
    font-family: 'Orbitron', sans-serif;
    font-size: 0.75rem;
    font-weight: 700;
    cursor: pointer;
    box-shadow: 0 0 20px var(--primary-glow);
    transition: transform 0.3s ease;
}

.btn-buy-now:hover {
    transform: scale(1.05);
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    padding-top: var(--header-h);
}

.hero-glow-1 {
    position: absolute;
    top: 20%;
    left: 10%;
    width: 400px;
    height: 400px;
    background: var(--primary-glow);
    filter: blur(120px);
    border-radius: 50%;
    z-index: 0;
}

.hero-glow-2 {
    position: absolute;
    bottom: 20%;
    right: 10%;
    width: 400px;
    height: 400px;
    background: var(--secondary-glow);
    filter: blur(120px);
    border-radius: 50%;
    z-index: 0;
}

.hero-content {
    position: relative;
    z-index: 10;
    text-align: left;
}

.hero-title {
    font-family: 'Orbitron', sans-serif;
    font-size: 5rem;
    font-weight: 900;
    line-height: 1.1;
    margin-bottom: 24px;
}

.hero-subtitle {
    font-size: 1.2rem;
    color: var(--text-muted);
    max-width: 600px;
    margin-bottom: 40px;
}

.hero-actions {
    display: flex;
    gap: 20px;
}

.btn-primary {
    background: var(--primary);
    border: none;
    color: white;
    padding: 18px 36px;
    border-radius: 8px;
    font-family: 'Orbitron', sans-serif;
    font-weight: 700;
    cursor: pointer;
    transition: 0.3s;
}

.btn-secondary {
    background: transparent;
    border: 2px solid var(--secondary);
    color: var(--secondary);
    padding: 18px 36px;
    border-radius: 8px;
    font-family: 'Orbitron', sans-serif;
    font-weight: 700;
    cursor: pointer;
    transition: 0.3s;
}

.btn-primary:hover {
    box-shadow: 0 0 30px var(--primary-glow);
    background: #c084fc;
}

.btn-secondary:hover {
    background: rgba(59, 130, 246, 0.1);
}

/* Sections Common */
.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-title {
    font-family: 'Orbitron', sans-serif;
    font-size: 2.5rem;
    color: var(--primary);
    text-shadow: 0 0 10px var(--primary-glow);
    margin-bottom: 10px;
}

.title-blue {
    color: var(--secondary);
    text-shadow: 0 0 10px var(--secondary-glow);
}

.section-header p {
    color: var(--text-muted);
}

/* Music Section */
.music-section {
    padding: 100px 0;
    background-color: #08080c;
}

.music-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.music-card {
    background: var(--card-bg);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: 20px;
    overflow: hidden;
    transition: 0.3s;
}

.music-card:hover {
    border-color: var(--primary);
    transform: translateY(-5px);
}

.card-img {
    position: relative;
    height: 300px;
    overflow: hidden;
}

.card-img img {
    width: 100%;
    height: 100%;
    object-cover: cover;
    transition: 0.5s;
}

.music-card:hover .card-img img {
    transform: scale(1.1);
}

.img-overlay {
    position: absolute;
    inset: 0;
    background: rgba(0,0,0,0.5);
    display: flex;
    justify-content: center;
    align-items: center;
    font-family: 'Orbitron', sans-serif;
    font-size: 0.8rem;
    opacity: 0;
    transition: 0.3s;
}

.music-card:hover .img-overlay {
    opacity: 1;
}

.card-info {
    padding: 24px;
}

.card-info h3 {
    font-size: 1.4rem;
    margin-bottom: 4px;
}

.card-info .genre {
    color: var(--primary);
    font-size: 0.85rem;
    margin-bottom: 16px;
    font-family: 'Orbitron', sans-serif;
}

audio {
    width: 100%;
    height: 35px;
    margin-bottom: 20px;
    filter: invert(100%) hue-rotate(180deg) brightness(1.5);
}

.card-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    padding-top: 20px;
}

.price {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--secondary);
    font-family: 'Orbitron', sans-serif;
}

.btn-sm {
    background: var(--primary);
    border: none;
    color: white;
    padding: 8px 20px;
    border-radius: 4px;
    cursor: pointer;
    font-weight: 600;
}

/* Bot Section */
.bot-section {
    padding: 100px 0;
}

.bot-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 40px;
}

.bot-card {
    background: linear-gradient(180deg, rgba(59, 130, 246, 0.1) 0%, rgba(12, 12, 18, 1) 50%);
    border: 1px solid rgba(59, 130, 246, 0.2);
    border-radius: 24px;
    padding: 40px;
    text-align: center;
    transition: 0.4s;
}

.bot-card:hover {
    border-color: var(--secondary);
    box-shadow: 0 10px 40px rgba(59, 130, 246, 0.15);
}

.bot-icon {
    font-size: 3rem;
    margin-bottom: 24px;
}

.bot-card h3 {
    font-family: 'Orbitron', sans-serif;
    font-size: 1.6rem;
    margin-bottom: 16px;
}

.bot-card p {
    color: var(--text-muted);
    font-size: 0.95rem;
    margin-bottom: 24px;
}

.bot-features {
    list-style: none;
    text-align: left;
    margin-bottom: 30px;
}

.bot-features li {
    font-size: 0.9rem;
    margin-bottom: 8px;
    color: #ccc;
}

.bot-features li::before {
    content: '✦';
    color: var(--secondary);
    margin-right: 10px;
}

.bot-price {
    font-family: 'Orbitron', sans-serif;
    font-size: 1.8rem;
    font-weight: 900;
    color: var(--secondary);
    margin-bottom: 24px;
}

.btn-buy-full {
    width: 100%;
    padding: 16px;
    background: var(--secondary);
    border: none;
    color: white;
    border-radius: 12px;
    font-family: 'Orbitron', sans-serif;
    font-weight: 700;
    cursor: pointer;
}

/* Footer */
footer {
    background: #000;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    padding: 80px 0 0 0;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1.5fr;
    gap: 60px;
    margin-bottom: 60px;
}

.footer-brand p {
    margin-top: 20px;
    color: var(--text-muted);
    max-width: 300px;
}

.footer-links h4, .footer-contact h4 {
    font-family: 'Orbitron', sans-serif;
    font-size: 0.9rem;
    margin-bottom: 24px;
    color: white;
}

.footer-links a {
    display: block;
    color: var(--text-muted);
    text-decoration: none;
    margin-bottom: 12px;
    transition: 0.3s;
}

.footer-links a:hover {
    color: var(--primary);
}

.footer-contact p {
    color: var(--text-muted);
    margin-bottom: 12px;
}

.btn-zalo-footer {
    margin-top: 10px;
    background: rgba(59, 130, 246, 0.1);
    border: 1px solid var(--secondary);
    color: var(--secondary);
    padding: 10px 20px;
    border-radius: 8px;
    cursor: pointer;
}

.footer-bottom {
    padding: 30px 0;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    text-align: center;
    font-size: 0.75rem;
    color: #444;
    font-family: 'Orbitron', sans-serif;
}

/* Responsive */
@media (max-width: 1024px) {
    .hero-title { font-size: 3.5rem; }
}

@media (max-width: 768px) {
    .nav-links, .btn-buy-now { display: none; }
    .hero-title { font-size: 2.8rem; }
    .footer-content { grid-template-columns: 1fr; gap: 40px; }
}