:root {

    /* MAIN */
    --main-color: #ffffff;
    --section-bg: #f3f7f4;

    /* CARD */
    --card-bg: #ffffff;

    /* TEXT */
    --dark-color: #111827;
    --grey-color: #4b5563;
    --sub-color: #6b7280;
    --light-color: #ffffff;

    /* GREEN */
    --font-color: #15803d;
    --green-hover: #16a34a;
    --green-dark: #14532d;
    --green-light: #dcfce7;

    /* BORDER */
    --border-color: #d1d5db;

    /* FOOTER */
    --footer-bg: #0f172a;

    --shadow:
    0 10px 30px rgba(0,0,0,0.06);

    --col-item: 5;
}

/* RESET */

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

body{
    font-family:'Poppins',sans-serif;
    background:var(--main-color);
    color:var(--dark-color);
    line-height:1.6;
}

a{
    text-decoration:none;
    color:inherit;
}

.container{
    width:90%;
    max-width:1200px;
    margin:auto;
}

/* HEADER */

header{
    position:fixed;
    width:100%;
    top:0;
    left:0;
    z-index:1000;
    background:rgba(255,255,255,0.96);
    backdrop-filter:blur(10px);
    border-bottom:1px solid var(--border-color);
}

nav{
    display:flex;
    justify-content:space-between;
    align-items:center;
    padding:18px 0;
}

.logo{
    font-size:28px;
    font-weight:700;
    color:var(--font-color);
}

.menu{
    display:flex;
    gap:28px;
}

.menu a{
    color:var(--dark-color);
    font-weight:500;
    transition:0.3s;
}

.menu a:hover{
    color:var(--font-color);
}

/* BUTTON */

.btn{
    display:inline-block;
    background:var(--font-color);
    color:white;
    padding:14px 28px;
    border-radius:50px;
    font-weight:600;
    transition:0.3s;
    font-size: 18px;
}

.btn:hover{
    transform:translateY(-3px);
    background:var(--green-hover);
}

/* HERO */

.hero{
    min-height:100vh;
    display:flex;
    align-items:center;
    background:
    linear-gradient(rgba(0,0,0,0.45), rgba(0,0,0,0.45)),
    url('https://images.unsplash.com/photo-1503376780353-7e6692767b70?q=80&w=2070&auto=format&fit=crop') center/cover;
}

.hero-content{
    max-width:700px;
}

.hero h1{
    font-size:62px;
    line-height:1.2;
    margin-bottom:20px;
    color:white;
}

.hero h1 span{
    color:#4ade80;
}

.hero p{
    margin-bottom:30px;
    font-size:18px;
    color:#f3f4f6;
}

.hero-buttons{
    display:flex;
    gap:20px;
    flex-wrap:wrap;
}

/* SECTION */

section{
    padding:100px 0;
}

.section-title{
    text-align:center;
    margin-bottom:60px;
}

.section-title h2{
    font-size:42px;
    color:var(--font-color);
    margin-bottom:15px;
}

.section-title p{
    color:var(--grey-color);
}

/* CARDS */

.cards{
    display:grid;
    grid-template-columns:repeat(auto-fit,minmax(280px,1fr));
    gap:30px;
}

.card{
    background:var(--card-bg);
    padding:30px;
    border-radius:20px;
    transition:0.3s;
    border:1px solid var(--border-color);
    box-shadow:var(--shadow);
}

.card:hover{
    transform:translateY(-8px);
    border-color:var(--font-color);
}

.card h3{
    color:var(--font-color);
    margin-bottom:15px;
    font-size:24px;
}

.card p{
    color:var(--grey-color);
}

/* ABOUT */

.about{
    display:grid;
    grid-template-columns:repeat(auto-fit,minmax(300px,1fr));
    gap:50px;
    align-items:center;
}

.about img{
    width:100%;
    border-radius:20px;
    box-shadow:var(--shadow);
}

.about-content h2{
    font-size:42px;
    margin-bottom:20px;
    color:var(--font-color);
}

.about-content p{
    color:var(--grey-color);
}

/* STATS */

.stats{
    display:grid;
    grid-template-columns:repeat(auto-fit,minmax(200px,1fr));
    gap:20px;
    margin-top:40px;
}

.stat{
    background:var(--green-light);
    padding:25px;
    border-radius:16px;
    text-align:center;
}

.stat h3{
    color:var(--green-dark);
    font-size:32px;
}

.stat p{
    color:var(--grey-color);
}

/* PRICING */

.pricing-section{
    background:var(--section-bg);
    padding:80px 5%;
}

.pricing-header{
    text-align:center;
    margin-bottom:50px;
}

.province-box p{
    margin:18px 0;
    font-weight:500;
    padding: 0 20px;
}

.pricing-header p{
    font-size:58px;
    color:var(--font-color);
}

.pricing-header h2{
    font-size:52px;
    font-weight:800;
    line-height:1.2;
    color:var(--dark-color);
}

.pricing-grid{
    display:grid;
    grid-template-columns:repeat(auto-fit,minmax(350px,1fr));
    gap:50px;
    padding:20px 100px;
}

.pricing-box{
    background:white;
    border-radius:24px;
    overflow:hidden;
    border:1px solid var(--border-color);
    box-shadow:var(--shadow);
    transition:0.3s;
}

.pricing-box:hover{
    transform:translateY(-8px);
}

.box-title{
    background:var(--font-color);
    color:white;
    padding:18px;
    text-align:center;
    font-size:28px;
    font-weight:700;
}

/* TABLE */

table{
    width:100%;
    border-collapse:collapse;
}

table th{
    background:var(--green-dark);
    color:white;
    padding:14px;
    border:1px solid rgba(255,255,255,0.08);
    font-size:18px;
}

table td{
    padding:14px;
    border:1px solid #e5e7eb;
    text-align:center;
    font-size:16px;
    color:var(--dark-color);
    background:white;
}

table tr:nth-child(even){
    background:#f9fafb;
}

table tr:hover td{
    background:var(--green-light);
}

/* NOTE */

.note{
    padding:20px;
    background:var(--green-light);
}

.note p{
    margin:10px 0;
    color:var(--green-dark);
    font-weight:600;
}

/* CONTACT BOX */

.contact-box{
    margin:20px;
    background:white;
    border:1px solid var(--border-color);
    border-radius:24px;
    padding:30px;
    text-align:center;
    box-shadow:var(--shadow);
}

.contact-box h3{
    font-size:40px;
    margin-bottom:25px;
    color:var(--font-color);
}

.phone{
    font-size:36px;
    font-weight:800;
    color:var(--font-color);
    margin-bottom:20px;
}

.zalo{
    font-size:28px;
    font-weight:700;
    color:var(--dark-color);
}

/* REVIEWS */

.reviews{
    background:var(--section-bg);
}

.review{
    background:white;
    padding:30px;
    border-radius:20px;
    border:1px solid var(--border-color);
    box-shadow:var(--shadow);
}

.review p{
    color:var(--grey-color);
    margin-bottom:20px;
}

.review h4{
    color:var(--font-color);
}

/* CONTACT */

.contact{
    background:linear-gradient(
        135deg,
        #f5fff7,
        #ecfdf3
    );
}

.contact-wrapper{
    display:grid;
    grid-template-columns:repeat(auto-fit,minmax(300px,1fr));
    gap:50px;
}

form{
    display:flex;
    flex-direction:column;
    gap:20px;
}

input,
textarea{
    padding:16px;
    border-radius:12px;
    border:1px solid var(--border-color);
    background:white;
    color:var(--dark-color);
    font-size:16px;
}

input:focus,
textarea:focus{
    outline:none;
    border-color:var(--font-color);
    box-shadow:0 0 0 4px rgba(34,197,94,0.15);
}

textarea{
    min-height:150px;
    resize:vertical;
}

/* STICKY PHONE */

.sticky-phone{
    position:fixed;
    bottom:25px;
    right:25px;
    background:var(--font-color);
    color:white;
    padding:16px 24px;
    border-radius:50px;
    display:flex;
    align-items:center;
    gap:12px;
    font-size:18px;
    font-weight:700;
    box-shadow:0 10px 25px rgba(0,0,0,0.15);
    z-index:2000;
    animation:pulse 1.5s infinite;
    transition:0.3s;
}

.sticky-phone:hover{
    transform:scale(1.05);
    background:var(--green-hover);
}

.sticky-phone span{
    font-size:22px;
}

@keyframes pulse{

    0%{
        transform:scale(1);
    }

    50%{
        transform:scale(1.08);
    }

    100%{
        transform:scale(1);
    }
}

/* FOOTER */

footer{
    background:var(--footer-bg);
    padding:40px 0;
    text-align:center;
    color:white;
}

/* MOBILE */

.mobile-toggle{
    display:none;
    font-size:28px;
    cursor:pointer;
}

@media(max-width:768px){

    .hero h1{
        font-size:42px;
    }

    .pricing-header h2{
        font-size:34px;
    }

    .pricing-header p{
        font-size:48px;
    }

    .box-title{
        font-size:22px;
    }

    table th,
    table td{
        font-size:14px;
        padding:10px;
    }

    .phone{
        font-size:28px;
    }

    .zalo{
        font-size:22px;
    }

    .menu{
        position:absolute;
        top:80px;
        right:5%;
        background:white;
        flex-direction:column;
        width:220px;
        padding:20px;
        border-radius:16px;
        display:none;
        box-shadow:var(--shadow);
    }

    .menu.active{
        display:flex;
    }

    .mobile-toggle{
        display:block;
    }
}



/* =========================
   RESPONSIVE MOBILE & TABLET
========================= */

@media (max-width: 992px){

    section{
        padding:80px 0;
    }

    .hero{
        min-height:90vh;
        text-align:center;
    }

    .hero-content{
        max-width:100%;
    }

    .hero h1{
        font-size:48px;
    }

    .hero p{
        font-size:17px;
    }

    .hero-buttons{
        justify-content:center;
    }

    .about{
        gap:30px;
    }

    .pricing-grid{
        padding:20px 0;
        gap:30px;
    }

    .contact-wrapper{
        gap:30px;
    }

    .section-title h2{
        font-size:36px;
    }

    .about-content h2{
        font-size:36px;
    }

}


/* MOBILE */

@media (max-width: 768px){

    .container{
        width:92%;
    }

    nav{
        padding:14px 0;
    }

    .logo{
        font-size:24px;
    }

    .hero{
        padding-top:100px;
        min-height:auto;
        padding-bottom:80px;
    }

    .hero h1{
        font-size:34px;
        line-height:1.35;
    }

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

    .hero-buttons{
        flex-direction:column;
        align-items:center;
    }

    .btn{
        width:100%;
        max-width:300px;
        text-align:center;
        font-size:16px;
        padding:14px 20px;
    }

    .section-title{
        margin-bottom:40px;
    }

    .section-title h2{
        font-size:30px;
    }

    .section-title p{
        font-size:15px;
    }

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

    .about-content{
        text-align:center;
    }

    .about-content h2{
        font-size:30px;
    }

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

    .cards{
        gap:20px;
    }

    .card{
        padding:24px;
    }

    .card h3{
        font-size:22px;
    }

    .pricing-header{
        margin-bottom:35px;
    }

    .pricing-header p{
        font-size:34px;
    }

    .pricing-header h2{
        font-size:28px;
    }

    .pricing-grid{
        grid-template-columns:1fr;
        padding:0;
    }

    .pricing-box{
        border-radius:18px;
    }

    .box-title{
        font-size:20px;
        padding:16px;
    }

    table{
        display:block;
        overflow-x:auto;
        white-space:nowrap;
    }

    table th,
    table td{
        font-size:13px;
        padding:10px;
    }

    .province-box p{
        font-size:15px;
    }

    .contact-box{
        padding:24px 18px;
        margin:18px;
    }

    .contact-box h3{
        font-size:30px;
    }

    .phone{
        font-size:24px;
    }

    .zalo{
        font-size:20px;
    }

    .contact-wrapper{
        grid-template-columns:1fr;
    }

    form{
        gap:16px;
    }

    input,
    textarea{
        font-size:15px;
    }

    .sticky-phone{
        right:15px;
        bottom:15px;
        padding:14px 18px;
        font-size:15px;
    }

    .sticky-phone span{
        font-size:18px;
    }

    footer{
        padding:30px 0;
    }

    .menu{
        position:absolute;
        top:75px;
        right:4%;
        width:92%;
        background:white;
        border-radius:18px;
        padding:20px;
        display:none;
        flex-direction:column;
        gap:18px;
        box-shadow:0 10px 30px rgba(0,0,0,0.1);
        border:1px solid #e5e7eb;
    }

    .menu.active{
        display:flex;
    }

    .mobile-toggle{
        display:block;
    }
}


/* SMALL PHONE */

@media (max-width: 480px){

    .hero h1{
        font-size:28px;
    }

    .hero p{
        font-size:15px;
    }

    .section-title h2{
        font-size:26px;
    }

    .pricing-header h2{
        font-size:24px;
    }

    .pricing-header p{
        font-size:28px;
    }

    .card{
        padding:20px;
    }

    .stat h3{
        font-size:28px;
    }

    .sticky-phone{
        width:calc(100% - 30px);
        justify-content:center;
        border-radius:16px;
    }
}