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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    color: #fff;
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
}

/* Video nền + Overlay */
.video-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
}

.background-video {
    width: 100%;
    height: 100%;
    object-fit: cover;
    pointer-events: none;
}

.overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.65);
    z-index: 1;
}

/* Logo trên cùng */
.top-logo {
    width: 100%;
    text-align: center;
    padding: 20px 0 0;
    margin: 0;
    background: transparent;
    z-index: 10;
    position: relative;
}

.top-logo img {
    width: 450px;
    max-width: 90%;
    height: auto;
    object-fit: contain;
    display: block;
    margin: 0 auto;
    filter: drop-shadow(0 4px 15px rgba(0, 0, 0, 0.6));
    transition: transform 0.3s ease;
}

.top-logo img:hover {
    transform: scale(1.03);
}

.container { 
    max-width: 1300px; 
    margin: 0 auto; 
    padding: 30px 20px 80px;
    position: relative;
    z-index: 2;
}

.section-title {
    text-align: center;
    font-size: 2.8rem;
    margin-bottom: 10px;
    color: #ffd700;
    text-shadow: 0 2px 10px rgba(0,0,0,0.8);
    font-weight: 800;
    letter-spacing: 1px;
}

.section-subtitle {
    text-align: center;
    font-size: 1.3rem;
    color: #eee;
    margin-bottom: 50px;
    text-shadow: 0 2px 8px rgba(0,0,0,0.7);
}

.services {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 25px;
}

.service-card {
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 215, 0, 0.2);
    border-radius: 24px;
    padding: 40px 20px 45px;
    text-align: center;
    transition: all 0.4s cubic-bezier(0.165, 0.84, 0.44, 1);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: space-between;
}

.service-card:hover {
    transform: translateY(-10px);
    background: rgba(255, 215, 0, 0.12);
    border-color: rgba(255, 215, 0, 0.6);
    box-shadow: 0 15px 35px rgba(255, 215, 0, 0.25);
}

/* Vòng tròn */
.circle-wrapper {
    width: 155px;
    height: 155px;
    margin: 0 auto 25px;
    position: relative;
    cursor: pointer;
}

.circle-wrapper svg {
    width: 100%;
    height: 100%;
    transform: rotate(-90deg);
}

.circle-bg {
    fill: none;
    stroke: rgba(255, 255, 255, 0.12);
    stroke-width: 14;
}

.circle-progress {
    fill: none;
    stroke: #ffd700;
    stroke-width: 14;
    stroke-linecap: round;
    stroke-dasharray: 440;
    stroke-dashoffset: 0;
    animation: spinCircle 2s linear infinite;
}

@keyframes spinCircle {
    from { stroke-dashoffset: 440; }
    to   { stroke-dashoffset: 0; }
}

.logo-center {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 98px;
    height: 98px;
    object-fit: contain;
    border-radius: 50%;
    transition: transform 0.3s ease;
}

.circle-wrapper:hover .logo-center {
    transform: translate(-50%, -50%) scale(1.1);
}

/* Nút */
.btn-experience {
    display: inline-block;
    margin-top: 20px;
    padding: 14px 30px;
    background: linear-gradient(90deg, #ffd700, #ffaa00);
    color: #1a0033;
    font-weight: 700;
    font-size: 1.05rem;
    border-radius: 50px;
    text-decoration: none;
    transition: all 0.3s ease;
    box-shadow: 0 6px 20px rgba(255, 215, 0, 0.4);
    cursor: pointer;
    text-transform: uppercase;
}

.btn-experience:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 25px rgba(255, 215, 0, 0.7);
    background: linear-gradient(90deg, #ffe033, #ffb81a);
}

.service-card h3 {
    font-size: 1.35rem;
    margin-bottom: 10px;
    color: #ffd700;
    min-height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    text-shadow: 0 2px 6px rgba(0,0,0,0.7);
    font-weight: 700;
}

/* Responsive */
@media (max-width: 1200px) {
    .services { grid-template-columns: repeat(2, 1fr); gap: 20px; }
    .section-title { font-size: 2.3rem; }
}

@media (max-width: 768px) {
    .top-logo img { width: 340px; }
    .section-title { font-size: 1.9rem; }
    .section-subtitle { font-size: 1.1rem; margin-bottom: 35px; }
    .container { padding: 20px 15px 60px; }
}

@media (max-width: 540px) {
    .services { grid-template-columns: 1fr; }
    .top-logo img { width: 300px; }
    .section-title { font-size: 1.6rem; }
    .service-card { padding: 30px 15px 35px; }
}