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

body{
    font-family: Arial, sans-serif;
    background:#000;
    color:#fff;
    line-height:1.6;
    margin:0;        /* QUAN TRỌNG */
    padding:0;       /* QUAN TRỌNG */
    width:100%;      /* QUAN TRỌNG */
}
/* HEADER */
.header{
    background:#000;
    padding:15px 0;
    position:fixed;
    width:100%;
    top:0;
    z-index:1000;
}

.nav{
    max-width:1100px;
    margin:auto;
    display:flex;
    justify-content:space-between;
    align-items:center;
    padding:0 20px;
}

.nav a{
    color:#fff;
    text-decoration:none;
    font-size:14px;
    transition:0.3s;
}

.nav a:hover{
    color:#00e0ff;
}

/* HERO */
.hero{
    position:relative;
    min-height:80px;      /* thay vì 100vh */
    padding:100px 20px 20px;
    background:url("images/luci-hero.jpg") center/cover no-repeat;
    display:flex;
    align-items:center;
    justify-content:center;
    text-align:center;
}

.hero-overlay{
    position:absolute;
    inset:0;
    background:rgba(0,0,0,0.6);
}

.hero-content{
    position:relative;
    max-width:800px;
}

.hero h1{
    font-size:38px;
    margin-bottom:20px;
}

.hero p{
    font-size:16px;
    margin-bottom:30px;
}

/* BUTTONS */
.btn{
    padding:12px 28px;
    border:none;
    cursor:pointer;
    font-weight:bold;
    border-radius:30px;
    margin:10px;
    transition:0.3s;
}

.primary-btn{
    background:linear-gradient(135deg,#00e0ff,#0099cc);
    color:#000;
    box-shadow:0 0 15px rgba(0,224,255,0.4);
}

.primary-btn:hover{
    transform:scale(1.05);
    box-shadow:0 0 25px rgba(0,224,255,0.8);
}

.secondary-btn{
    background:transparent;
    border:1px solid #00e0ff;
    color:#00e0ff;
}

.secondary-btn:hover{
    background:#00e0ff;
    color:#000;
}

/* SECTIONS */
.section{
    padding:100px 20px;
    text-align:center;
    max-width:1100px;
    margin:auto;
    margin-bottom:10px;
}

.dark{
    position:relative;
}

.section.dark::before{
    content:"";
    position:absolute;
    inset:-2px;
    border-radius:55px;
    background:radial-gradient(circle at top, rgba(0,255,255,0.15), transparent 80%);
    z-index:-1;
}
.section-title{
    font-size:28px;
    margin-bottom:40px;
    position:relative;
}

.section-title::after{
    content:"";
    width:60px;
    height:3px;
    background:#00e0ff;
    display:block;
    margin:15px auto 0;
}

/* CONTENT */
.section-content{
    max-width:800px;
    margin:auto;
}

.feature-list{
    list-style:none;
    margin:20px 0;
}

.feature-list li{
    margin:8px 0;
}

/* TOGGLE */
.hidden{
    display:none;
}

.toggle-btn{
    margin-top:15px;
    background:none;
    border:none;
    color:#00e0ff;
    cursor:pointer;
    font-weight:bold;
}

/* CARDS */
.card-wrapper{
    display:flex;
    gap:30px;
    flex-wrap:wrap;
    justify-content:center;
}

.info-card{
    background:#1a1a1a;
    padding:30px;
    border-radius:20px;
    width:100%;
    max-width:450px;
    border:1px solid rgba(0,224,255,0.2);
    transition:0.3s;
}

.info-card:hover{
    border-color:#00e0ff;
    transform:translateY(-5px);
}

/* SPEC GRID */
.spec-grid{
    display:grid;
    grid-template-columns:repeat(auto-fit,minmax(250px,1fr));
    gap:20px;
    text-align:left;
}

.spec-grid div{
    background:#1a1a1a;
    padding:15px 20px;
    border-radius:10px;
    border-left:3px solid #00e0ff;
}

.spec-grid.small{
    max-width:800px;
    margin:20px auto 40px;
}

/* INTRO TEXT */
.intro-text{
    max-width:700px;
    margin:0 auto 30px;
    font-style:italic;
}

/* SLIDER */
.slider{
    overflow:hidden;
    max-width:600px;
    margin:30px auto 0;
    border-radius:20px;
}

.slides{
    display:flex;
    transition:transform 0.5s ease-in-out;
}

.slides img{
    width:100%;
    flex-shrink:0;
    border-radius:10px;
}

/* PRICE */
.price-text{
    font-size:22px;
    margin-bottom:30px;
}


.image-break{
    display:flex;
    justify-content:center;
    padding:1px 10px 20px;
}

.image-break img{
    width:100%;
    max-width:900px;
    border-radius:25px;
    object-fit:cover;
    box-shadow:0 20px 60px rgba(0,0,0,0.6);
    transition:0.4s;
}

.image-break img:hover{
    transform:scale(1.02);
}
/* ===== LUCI POPUP ===== */

.popup-overlay{
    position:fixed;
    inset:0;
    background:rgba(0,0,0,0.7);
    display:none;
    justify-content:center;
    align-items:center;
    z-index:9999;
}

.popup-overlay.active{
    display:flex;
}

.popup-box{
    background:#111;
    width:95%;
    max-width:700px;
    max-height:90vh;
    overflow-y:auto;
    padding:40px;
    border-radius:20px;
    border:1px solid #00e0ff;
}

.popup-header{
    position:relative;
    text-align:center;
    margin-bottom:20px;
}

.close-btn{
    position:absolute;
    right:0;
    top:0;
    cursor:pointer;
    font-size:22px;
}

.option-group{
    margin-bottom:25px;
}

.scroll-select{
    display:grid;
    grid-template-columns:repeat(2,1fr);
    gap:15px;
}

.option-item{
    background:#1a1a1f;
    border:1px solid #333;
    padding:12px;
    border-radius:10px;
    text-align:center;
    cursor:pointer;
    transition:0.3s;
}

.option-item.active{
    border:1px solid #00e0ff;
    box-shadow:0 0 10px rgba(0,224,255,0.4);
}

.quantity-control{
    display:flex;
    align-items:center;
    gap:15px;
}

.quantity-control button{
    width:35px;
    height:35px;
}

.total-box{
    margin:20px 0;
    padding:15px;
    background:#1a1a1f;
    border-radius:10px;
    text-align:center;
}

.customer-info input{
    width:100%;
    padding:10px;
    margin-bottom:10px;
    border-radius:6px;
    border:none;
}

.confirm-btn{
    width:100%;
    padding:14px;
    background:#00e0ff;
    border:none;
    border-radius:10px;
    cursor:pointer;
    font-weight:bold;
}
.customer-info textarea{
    width:100%;
    padding:10px;
    margin-bottom:10px;
    border-radius:6px;
    border:none;
    resize:none;
}



/* RESPONSIVE */
@media(max-width:768px){
    .hero h1{
        font-size:26px;
    }

    .section{
        padding:70px 20px;
    }

    .card-wrapper{
        flex-direction:column;
        align-items:center;
    }
}