/* ========== RESET & BASE ========== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
    background-color: #0b0f1c;
    color: #e0e5f0;
    line-height: 1.6;
    position: relative;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Nền lưới (grid effect) */
.bg-grid {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        linear-gradient(rgba(0, 255, 200, 0.05) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 255, 200, 0.05) 1px, transparent 1px);
    background-size: 50px 50px;
    pointer-events: none;
    z-index: -1;
}

.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 32px;
    width: 100%;
}

/* ========== HEADER ========== */
.header {
    padding: 24px 0;
    border-bottom: 1px solid rgba(0, 255, 200, 0.2);
    backdrop-filter: blur(8px);
    background: rgba(11, 15, 28, 0.6);
    position: sticky;
    top: 0;
    z-index: 100;
}

.logo {
    font-size: 2.2rem;
    font-weight: 800;
    background: linear-gradient(145deg, #a0f0ea, #7aa2f7);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    letter-spacing: -0.02em;
}

/* ========== HERO ========== */
.hero {
    padding: 60px 0 40px;
}

.hero-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 50px;
    align-items: center;
}

.hero-content h1 {
    font-size: 3.2rem;
    font-weight: 800;
    line-height: 1.2;
    background: linear-gradient(135deg, #b1f0ff, #c7b9ff, #ffb8d2);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 24px;
}

.hero-description {
    font-size: 1.1rem;
    background: rgba(10, 20, 40, 0.5);
    backdrop-filter: blur(4px);
    border-radius: 28px;
    padding: 24px;
    border: 1px solid rgba(0, 255, 200, 0.2);
    margin-bottom: 32px;
    box-shadow: 0 18px 30px -12px #00ccb080;
}

.inline-link {
    color: #9bffea;
    font-weight: 700;
    text-decoration: none;
    border-bottom: 2px solid #7aa2f7;
    transition: 0.2s;
}

.inline-link:hover {
    color: #ffffff;
    border-bottom-color: #00ffc3;
}

.hero-buttons {
    display: flex;
    gap: 24px;
    flex-wrap: wrap;
    align-items: center;
}

.btn {
    padding: 16px 38px;
    border-radius: 60px;
    font-weight: 700;
    font-size: 1.1rem;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 12px;
    transition: 0.3s;
    border: none;
    cursor: pointer;
}

.btn-primary {
    background: linear-gradient(145deg, #0f2b3d, #1b4a6b);
    color: #e6f7ff;
    box-shadow: 0 15px 25px -8px #00ccb0, 0 0 0 1px #00ffe0 inset;
}

.btn-primary:hover {
    background: linear-gradient(145deg, #124f6b, #0d3f55);
    transform: translateY(-4px);
    box-shadow: 0 25px 35px -8px #00ffd0, 0 0 0 2px #aafff0 inset;
}

.naked-url {
    font-size: 1.1rem;
    background: rgba(0, 200, 200, 0.1);
    padding: 12px 28px;
    border-radius: 60px;
    border: 1px dashed #00ffe0;
}

.naked-url a {
    color: #b2fffa;
    text-decoration: none;
    border-bottom: 2px solid #7aa2f7;
    padding-bottom: 2px;
}

.naked-url a:hover {
    color: white;
    border-bottom-color: #00ffe0;
}

.hero-visual {
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100%;
    min-height: 300px;
}

.orb {
    position: absolute;
    width: 280px;
    height: 280px;
    background: radial-gradient(circle at 30% 30%, #00ffee30, #1e1e5a20);
    border-radius: 50%;
    filter: blur(50px);
    animation: pulse 6s infinite alternate;
}

.game-icon {
    position: relative;
    color: #c0ffff;
    filter: drop-shadow(0 0 20px #00ffff);
    opacity: 0.9;
    z-index: 2;
    font-size: 7rem;
}

@keyframes pulse {
    0% { transform: scale(0.8); opacity: 0.4; }
    100% { transform: scale(1.3); opacity: 0.8; }
}

/* ========== CARDS ========== */
.cards-section {
    padding: 80px 0;
}

.cards-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.card {
    background: rgba(18, 25, 45, 0.6);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(0, 255, 200, 0.2);
    border-radius: 40px;
    padding: 38px 28px;
    transition: 0.4s ease;
    box-shadow: 0 20px 40px -15px #000b1a;
    display: flex;
    flex-direction: column;
}

.card:hover {
    transform: translateY(-12px) scale(1.02);
    border-color: #00ffc3;
    box-shadow: 0 30px 50px -12px #00ffc380;
    background: rgba(20, 30, 55, 0.7);
}

.card-icon {
    background: linear-gradient(145deg, #0d3340, #1b4a6b);
    width: 70px;
    height: 70px;
    border-radius: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 28px;
    color: #00ffea;
    font-size: 2.2rem;
    box-shadow: 0 10px 18px -6px #00ffe0;
}

.card h2 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 20px;
    background: linear-gradient(145deg, #a3f5ff, #d3bfff);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.card p {
    color: #cdd9f0;
    font-size: 1rem;
    flex: 1;
}

/* ========== FOOTER ========== */
.footer {
    background: #030617;
    border-top: 2px solid #00ffc350;
    padding: 32px 0 24px;
    text-align: center;
    margin-top: 60px;
}

.footer-name {
    font-size: 1.8rem;
    font-weight: 700;
    background: linear-gradient(145deg, #73f7e6, #b9aeff);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 12px;
}

.copyright {
    color: #8b9bb5;
    font-size: 0.95rem;
    border-top: 1px dashed #336b66;
    padding-top: 20px;
    max-width: 700px;
    margin: 0 auto;
}

/* ========== RESPONSIVE ========== */
@media (max-width: 1024px) {
    .hero-container {
        grid-template-columns: 1fr;
        text-align: center;
    }
    .hero-buttons {
        justify-content: center;
    }
    .cards-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .cards-grid {
        grid-template-columns: 1fr;
    }
    .hero-content h1 {
        font-size: 2.5rem;
    }
    .orb {
        width: 200px;
        height: 200px;
    }
}

@media (max-width: 480px) {
    .hero-buttons {
        flex-direction: column;
        align-items: stretch;
    }
    .btn, .naked-url {
        width: 100%;
        text-align: center;
        justify-content: center;
    }
}