body {
    margin: 0;
    font-family: 'Segoe UI', sans-serif;
    color: #333;
}

.container {
    width: 90%;
    margin: auto;
}

.header {
    background: #0a1f44;
    color: white;
    padding: 15px 0;
}
.nav {
    display: flex;
    justify-content: space-between;
}

nav{
    margin: 30px;
}
nav a {
    color: white;
    margin-left: 20px;
    text-decoration: none;
}

/* HERO */
.hero {
    position: relative;
    height: 50vh;
    background: url('images/kol-tai-chinh-5.jpg') center/cover;
}

.overlay {
    position: absolute;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.6);
}

.hero-content {
    position: relative;
    color: white;
    top: 50%;
    transform: translateY(-50%);
}

.btn {
    background: gold;
    padding: 12px 25px;
    text-decoration: none;
    color: black;
}

.btn.dark {
    background: #0a1f44;
    color: white;
}

/* SECTIONS */
.section {
    padding: 70px 0;
}

.bg-light {
    background: #f4f6f9;
}

.bg-dark {
    background: #0a1f44;
    color: white;
}

.center {
    text-align: center;
}

/* GRID */
.grid-2 {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
}

.grid-2 img{
    height: 80%;
    width: -webkit-fill-available;
}
.grid-3 {
    display: grid;
    grid-template-columns: repeat(3,1fr);
}

.grid-4 {
    display: grid;
    grid-template-columns: repeat(4,1fr);
    gap: 20px;
}

/* CARD */
.card {
    background: white;
    padding: 25px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

/* PROCESS */
.process span {
    font-size: 30px;
    color: gold;
}
/* PARTNERS */
.partners {
    background: #f4f4f4;
    padding: 50px 0;
    text-align: center;
}

.partner-grid {
    display: flex;
    justify-content: space-around;
}

.partner-grid img {
    width: 100px;
}
/* LOGO */
.logos {
    display: flex;
    justify-content: space-around;
    margin-top: 20px;
}

/* CTA */
.cta {
    background: gold;
    text-align: center;
    padding: 50px 0;
}

/* FOOTER */
footer {
    background: #111;
    color: white;
    padding: 40px 0;
}

footer a {
    color: #ccc;
    text-decoration: none;
}

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

/* Tablet */
@media (max-width: 1024px) {

    .grid-4 {
        grid-template-columns: repeat(2, 1fr);
    }

    .grid-3 {
        grid-template-columns: repeat(2, 1fr);
    }

    .grid-2 {
        grid-template-columns: 1fr;
    }

    .hero h2 {
        font-size: 26px;
    }
}

/* Mobile */
@media (max-width: 768px) {

    /* NAV */
    .nav {
        flex-direction: column;
        align-items: center;
    }

    nav {
        margin-top: 10px;
    }

    nav a {
        display: block;
        margin: 10px 0;
    }

    /* HERO */
    .hero {
        height: 25vh;
        padding: 80px 20px;
        text-align: center;
    }

    .hero-content {
        top: 0;
        transform: none;
    }

    .hero h2 {
        font-size: 22px;
    }

    .hero p {
        font-size: 14px;
    }

    /* GRID */
    .grid-4,
    .grid-3 {
        grid-template-columns: 1fr;
    }

    /* IMAGE */
    .grid-2 img {
        width: 100%;
        margin-top: 20px;
    }

    /* PROCESS */
    .process {
        text-align: center;
    }

    /* LOGO */
    .logos {
        flex-direction: column;
        gap: 10px;
    }

    /* BUTTON */
    .btn {
        padding: 10px 15px;
        font-size: 14px;
    }
}

/* Small Mobile */
@media (max-width: 480px) {

    .container {
        width: 95%;
    }

    h2 {
        font-size: 20px;
    }

    p {
        font-size: 14px;
    }

}
/* SUB HERO */
.sub-hero {
    position: relative;
    background: url('images/photo-1521791136064-7986c2920216.jpg') center/cover;
    color: white;
    text-align: center;
    padding: 100px 20px;
}

.sub-hero .overlay {
    position: absolute;
    top:0; left:0;
    width:100%; height:100%;
    background: rgba(0,0,0,0.6);
}

.sub-hero .container {
    position: relative;
}

/* TEAM IMAGE */
.card img {
    border-radius: 50%;
    margin-bottom: 15px;
}

/* CONTACT */
.contact-form form {
    display: flex;
    flex-direction: column;
}

.contact-form input,
.contact-form textarea {
    padding: 12px;
    margin-bottom: 15px;
    border: 1px solid #ccc;
    border-radius: 5px;
}

.contact-info .info-box {
    margin-bottom: 20px;
}

/* MAP */
.map iframe {
    width: 100%;
    border: none;
}