/* Style: index.styles07.css - Power Black (Monochrome Luxury) Theme */

:root {
    --bg-dark: #000000;
    --accent-silver: #e5e5e5;
    --deep-grey: #1a1a1a;
    --pure-white: #ffffff;
    --glass: rgba(255, 255, 255, 0.02);
    --glass-border: rgba(255, 255, 255, 0.1);
}

* { box-sizing: border-box; transition: all 0.5s cubic-bezier(0.16, 1, 0.3, 1); }

body {
    margin: 0;
    font-family: 'Plus Jakarta Sans', sans-serif;
    background: var(--bg-dark);
    color: var(--accent-silver);
    overflow-x: hidden;
    line-height: 1.5;
}

/* Hiệu ứng hạt bụi sáng mờ ảo trên nền đen tuyệt đối */
body::before {
    content: "";
    position: fixed;
    top: 0; left: 0; width: 100%; height: 100%;
    background: radial-gradient(circle at 50% 50%, #111 0%, #000 100%);
    z-index: -2;
}

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

/* Hero Section */
.hero {
    padding: 130px 0 90px;
    text-align: center;
}

.badge {
    background: var(--pure-white);
    color: var(--bg-dark);
    padding: 6px 30px;
    border-radius: 0;
    font-size: 0.75rem;
    font-weight: 900;
    text-transform: uppercase;
    letter-spacing: 5px;
    display: inline-block;
}

h1.main-title {
    font-size: clamp(3rem, 10vw, 5rem);
    margin: 30px 0;
    color: var(--pure-white);
    font-weight: 900;
    letter-spacing: -3px;
    text-transform: uppercase;
}

/* Features Grid */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 40px;
    margin: 60px 0;
}

.feature-card {
    background: var(--deep-grey);
    border: 1px solid transparent;
    border-radius: 0;
    padding: 50px;
    text-decoration: none;
    color: inherit;
    position: relative;
    display: flex;
    flex-direction: column;
}

.feature-card:hover {
    background: #111;
    border-color: var(--glass-border);
    transform: scale(1.02);
}

.feature-card::after {
    content: "";
    position: absolute;
    top: 0; left: 0; width: 100%; height: 100%;
    box-shadow: 0 40px 100px rgba(0,0,0,0.8);
    opacity: 0;
    transition: opacity 0.5s ease;
}

.feature-card:hover::after { opacity: 1; }

.icon-box {
    font-size: 2.5rem;
    margin-bottom: 30px;
    filter: grayscale(1) brightness(2);
}

.feature-card h3 {
    font-size: 1.6rem;
    margin: 10px 0;
    color: var(--pure-white);
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.feature-card p.subtitle {
    font-weight: 400;
    margin-bottom: 20px;
    font-size: 0.9rem;
    color: #888;
    text-transform: uppercase;
    letter-spacing: 2px;
}

.feature-card p.description {
    color: #666;
    font-size: 0.95rem;
    line-height: 1.8;
}

.feature-card:hover p.description { color: #aaa; }

.btn-go {
    margin-top: auto;
    display: flex;
    align-items: center;
    color: var(--pure-white);
    font-weight: 900;
    font-size: 0.8rem;
    padding-top: 30px;
    letter-spacing: 2px;
    border-bottom: 1px solid #333;
    width: fit-content;
}

/* Stats Section */
.stats-bar {
    display: flex;
    justify-content: space-between;
    padding: 100px 0;
    border-top: 1px solid #222;
    margin-top: 80px;
    flex-wrap: wrap;
    gap: 40px;
}

.stat-item h2 { 
    font-size: 4rem; 
    margin: 0; 
    color: var(--pure-white);
    font-weight: 900;
    letter-spacing: -2px;
}
.stat-item p { margin: 10px 0 0; color: #444; text-transform: uppercase; font-size: 0.8rem; letter-spacing: 4px; }

/* Footer */
footer {
    padding: 120px 0 60px;
    text-align: center;
}

.cta-btn {
    background: var(--pure-white);
    color: var(--bg-dark);
    padding: 22px 70px;
    border-radius: 0;
    text-decoration: none;
    font-weight: 900;
    display: inline-block;
    margin-bottom: 50px;
    text-transform: uppercase;
    letter-spacing: 4px;
}

.cta-btn:hover {
    background: #ccc;
    transform: translateY(-5px);
}

@media (max-width: 768px) {
    .features-grid { grid-template-columns: 1fr; }
    .stat-item { flex-basis: 100%; text-align: center; }
}