:root {
    --primary: #c8102e;
    --accent: #ff6600;
    --gold: #f2c94c;
}

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

body{
    font-family:"Segoe UI",sans-serif;
    background:linear-gradient(135deg,#e0f7fa,#f8f1e3);
    padding-top:85px;
}

/* ================= HEADER ================= */

header{
    position:fixed;
    top:0;
    left:0;
    width:100%;
    background:rgba(255,255,255,.96);
    backdrop-filter:blur(15px);
    border-bottom:1px solid rgba(0,0,0,.08);
    z-index:1000;
    transition:.3s;
}

header.scrolled{
    box-shadow:0 8px 25px rgba(0,0,0,.1);
}

.nav{
    max-width:1300px;
    height:85px;
    margin:auto;
    padding:0 25px;

    display:flex;
    justify-content:space-between;
    align-items:center;
}

.logo{
    display:flex;
    align-items:center;
    gap:12px;

    font-size:28px;
    font-weight:700;
    color:#243b55;
    white-space:nowrap;
    flex-shrink:0;
}

.logo img{
    width:60px;
    height:60px;
    border-radius:50%;
    object-fit:cover;
    transition:.3s;
}

.logo img:hover{
    transform:scale(1.08) rotate(-5deg);
}

.overlay.active{
    opacity:1;
    visibility:visible;
}

/* Menu */
.nav-links {
    display:flex;
    align-items:center;
    gap:32px;
}

.nav-links a{
    position:relative;
    color:#243b55;
    text-decoration:none;
    font-weight:600;
    transition:.3s;
}

.nav-links a.active{
    color:#c8102e;
}

.nav-links a.active::after{
    content:"";
    position:absolute;
    left:0;
    bottom:-10px;
    width:100%;
    height:3px;
    background:#c8102e;
}

.nav-links a:hover{
    color:var(--primary);
}

.hamburger{
    display:none;
    font-size:28px;
    cursor:pointer;
    color:var(--primary);
}
/* ================= HERO ================= */

.hero-hanoi{
    position:relative;
    height:85vh;
    min-height:650px;
    overflow:hidden;
    color:#fff;
}

.map-360{
    position:absolute;
    inset:0;
}

.map-360 iframe{
    width:100%;
    height:100%;
    border:none;
    filter:brightness(.85);
}

.hero-content{
    position:relative;
    z-index:2;
    max-width:1200px;
    margin:auto;
    height:100%;
    padding:0 40px;

    display:flex;
    align-items:center;
}

.hero-text h1{
    font-size:clamp(3rem,7vw,6rem);
    font-weight:900;
    line-height:1.1;
    text-shadow:0 5px 20px rgba(0,0,0,.6);
}

.hero-text span{
    color:var(--gold);
}

/* ================= CONTENT ================= */

.content{
    padding:90px 20px;
    background:#fff;
}

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

.main-title,
.section-title{
    color:var(--primary);
    margin-bottom:20px;
}

.info-grid{
    display:grid;
    grid-template-columns:repeat(auto-fit,minmax(350px,1fr));
    gap:30px;
    margin:40px 0;
}

.info-card{
    background:#fff;
    padding:35px;
    border-radius:20px;
    box-shadow:0 12px 30px rgba(0,0,0,.08);
    transition:.35s;
}

.info-card:hover{
    transform:translateY(-10px);
    box-shadow:0 18px 40px rgba(0,0,0,.15);
}

.location-list{
    background:#f8f9fa;
    padding:30px;
    border-radius:20px;
    line-height:2;
}

/* ================= GALLERY ================= */

.image-gallery{
    display:grid;
    grid-template-columns:repeat(auto-fit,minmax(300px,1fr));
    gap:25px;
    margin:40px 0;
}

.image-gallery img{
    width:100%;
    height:260px;
    object-fit:cover;
    border-radius:18px;
    transition:.35s;
    box-shadow:0 12px 30px rgba(0,0,0,.12);
}

.image-gallery img:hover{
    transform:scale(1.05);
    box-shadow:0 20px 45px rgba(0,0,0,.18);
}

/* ================= FOOTER ================= */

footer{
    background:linear-gradient(135deg,#f8fbff,#dceeff,#b8dcff);
    color:#222;
    text-align:center;
    padding:60px 20px 30px;
}

/* ================= RESPONSIVE ================= */

@media (max-width:767px){

    .nav{
        padding:0 15px;
    }

    .nav-links{
        gap:18px;
    }

    .nav-links a{
        font-size:15px;
    }

    .logo{
        font-size:22px;
    }

    .logo img{
        width:50px;
        height:50px;
    }
}

@media (max-width:767px){

    .nav{
        height:75px;
    }

    .nav-links{
        display:none;
    }

    .hamburger{
        display:block;
    }

    .hero-content{
        padding:0 20px;
    }

    .info-grid{
        grid-template-columns:1fr;
    }

    .image-gallery{
        grid-template-columns:1fr;
    }

    .image-gallery img{
        height:220px;
    }
}

/* ========= Mobile Menu ========= */

.mobile-menu{
    position:fixed;
    top:0;
    left:-280px;
    width:260px;
    height:100vh;
    background:#fff;
    box-shadow:5px 0 20px rgba(0,0,0,.15);
    transition:.35s;
    z-index:2000;

    display:flex;
    flex-direction:column;

    padding:80px 25px 20px;
}

.mobile-menu.active{
    left:0;
}

.mobile-menu a{
    text-decoration:none;
    color:#243b55;
    font-size:18px;
    font-weight:600;
    padding:15px 0;
    border-bottom:1px solid #eee;
    transition:.25s;
}

.mobile-menu a:hover{
    color:var(--primary);
    padding-left:10px;
}

.close-btn{
    position:absolute;
    top:20px;
    right:20px;
    font-size:28px;
    cursor:pointer;
}

.overlay{
    position:fixed;
    inset:0;
    background:rgba(0,0,0,.35);
    opacity:0;
    visibility:hidden;
    transition:.3s;
    z-index:1500;
}

.overlay.active{
    opacity:1;
    visibility:visible;
}

/* Tablet */

@media(max-width:767px){

    .nav-links{
        display:none;
    }

    .hamburger{
        display:block;
        font-size:30px;
        cursor:pointer;
    }

}

/* Điện thoại */

@media(max-width:767px){

    .nav{
        height:72px;
        padding:0 15px;
    }

    .logo img{
        width:45px;
        height:45px;
    }

    .logo span{
        font-size:20px;
    }

}

/* Điện thoại nhỏ */

@media(max-width:480px){

    body{
        padding-top:72px;
    }

    .logo span{
        font-size:18px;
    }

    .hero-text h1{
        font-size:2.5rem;
    }

    .content{
        padding:60px 15px;
    }

}


/* Hamburger */
.hamburger{
    display:none;
    font-size:30px;
    cursor:pointer;
    z-index:2001;
}

@media (max-width:767px){

    .hamburger{
        display:block;
    }

    .nav-links{
        position:fixed;
        top:0;
        right:-100%;
        width:80%;
        max-width:320px;
        height:100vh;

        background:#fff;

        display:flex;
        flex-direction:column;
        align-items:flex-start;

        padding-top:90px;

        transition:.35s;

        z-index:2000;

        overflow-y:auto;
    }

    .nav-links.active{
        right:0;
    }

    .nav-links a{
        width:100%;
        padding:18px 25px;
        border-bottom:1px solid #eee;
        text-align:left;
    }

    body.menu-open{
        overflow:hidden;
    }
}