:root {
    --primary-color: #00ff88; /* Xanh Neon nổi bật */
    --secondary-color: #00d4ff; /* Xanh dương sáng */
    --bg-dark: #0f111a;
    --bg-card: #1a1d2d;
    --text-light: #e0e0e0;
    --text-dim: #a0a0b0;
    --accent: #7000ff;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Poppins', sans-serif;
}

body {
    background-color: var(--bg-dark);
    color: var(--text-light);
    line-height: 1.6;
    overflow-x: hidden;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 20px;
    position: relative;
    z-index: 2;
}

/* HERO SECTION - Trendy Design */
.hero-section {
    min-height: 90vh; /* Chiếm gần hết màn hình đầu */
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    position: relative;
    background: radial-gradient(circle at top center, #2a1b3d 0%, var(--bg-dark) 70%);
    padding: 40px 0;
}

.hero-bg-effect {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 100%;
    height: 100%;
    background: url('data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSI0MCIgaGVpZ2h0PSI0MCIgdmlld0JveD0iMCAwIDQwIDQwIj48ZyBmaWxsLXJ1bGU9ImV2ZW5vZGQiPjxwYXRoIGQ9Ik0wIDQwaDQwVjBIMHY0MHptMjAgMjBWMjBIMjB2MjB6IiBzdHlsZT0ib3BhY2l0eTowLjAzIi8+PC9nPjwvc3ZnPg==');
    z-index: 1;
}

.badge {
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    padding: 5px 15px;
    border-radius: 20px;
    font-size: 0.8rem;
    color: var(--primary-color);
    text-transform: uppercase;
    letter-spacing: 1px;
    font-weight: 600;
    margin-bottom: 20px;
    display: inline-block;
}

h1 {
    font-size: 3.5rem;
    line-height: 1.2;
    margin-bottom: 20px;
    font-weight: 800;
}

.highlight {
    background: linear-gradient(to right, var(--secondary-color), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-desc {
    font-size: 1.2rem;
    color: var(--text-dim);
    margin-bottom: 40px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* CTA BUTTON STYLE - Nút Download to & đẹp */
.cta-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
}

.btn-download {
    background: linear-gradient(45deg, var(--primary-color), var(--secondary-color));
    color: #000;
    font-weight: 800;
    font-size: 1.3rem;
    padding: 20px 50px;
    border-radius: 50px;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 10px;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    box-shadow: 0 10px 30px rgba(0, 255, 136, 0.3);
    border: 2px solid transparent;
}

.btn-download:hover {
    transform: translateY(-5px) scale(1.05);
    box-shadow: 0 20px 40px rgba(0, 255, 136, 0.5);
    background: linear-gradient(45deg, var(--secondary-color), var(--primary-color));
}

.btn-download.small {
    font-size: 1rem;
    padding: 15px 30px;
}

/* Hiệu ứng đập nhịp tim cho nút */
@keyframes pulse {
    0% { box-shadow: 0 0 0 0 rgba(0, 255, 136, 0.4); }
    70% { box-shadow: 0 0 0 20px rgba(0, 255, 136, 0); }
    100% { box-shadow: 0 0 0 0 rgba(0, 255, 136, 0); }
}

.pulsating {
    animation: pulse 2s infinite;
}

.safe-text {
    font-size: 0.9rem;
    color: var(--text-dim);
    margin-top: 10px;
}

/* CONTENT STYLE */
.content-wrapper {
    background: var(--bg-card);
    padding: 60px 0;
    border-radius: 40px 40px 0 0;
    margin-top: -40px;
    position: relative;
    z-index: 3;
    border-top: 1px solid rgba(255,255,255,0.05);
}

.post-content h2, .post-content h3 {
    color: #fff;
    margin-top: 30px;
    margin-bottom: 15px;
}

.post-content h2 {
    font-size: 2rem;
    text-align: center;
    margin-bottom: 30px;
    background: linear-gradient(to right, #fff, #aaa);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.post-content p {
    margin-bottom: 20px;
    color: var(--text-dim);
    text-align: justify;
}

.post-content strong {
    color: var(--secondary-color);
}

/* Info Box */
.info-box {
    background: rgba(255,255,255,0.03);
    border-left: 4px solid var(--accent);
    padding: 20px;
    margin: 30px 0;
    border-radius: 0 10px 10px 0;
}

.info-box ul {
    list-style: none;
    margin-top: 15px;
}

.info-box li {
    margin-bottom: 10px;
    position: relative;
    padding-left: 25px;
}

.info-box li::before {
    content: '✓';
    color: var(--primary-color);
    position: absolute;
    left: 0;
    font-weight: bold;
}

.note {
    background: rgba(255, 87, 87, 0.1);
    color: #ff5757 !important;
    padding: 15px;
    border-radius: 10px;
    border: 1px solid rgba(255, 87, 87, 0.2);
}

.final-cta {
    text-align: center;
    margin-top: 50px;
    padding: 40px;
    background: rgba(0,0,0,0.3);
    border-radius: 20px;
}

/* FOOTER */
footer {
    background: #000;
    padding: 40px 0;
    text-align: center;
    color: #555;
    font-size: 0.9rem;
}

footer .disclaimer {
    margin-top: 10px;
    font-size: 0.8rem;
}

/* RESPONSIVE */
@media (max-width: 600px) {
    h1 { font-size: 2.5rem; }
    .hero-section { min-height: 80vh; }
    .btn-download { padding: 15px 30px; font-size: 1.1rem; width: 100%; justify-content: center;}
    .container { padding: 0 20px; }
}