:root{
--primary:#00357B;
--primary-dark:#00295d;
--secondary:#31AA8B;
--secondary-dark:#278c73;
--light:#f8f9fb;
--text:#333;
--white:#fff;
--border:#ddd;
--success:#28a745;
--danger:#dc3545;
}

/* =========================
RESET
========================= */

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

html{
scroll-behavior:smooth;
scroll-padding-top:100px;
}

body{
font-family:'Poppins',sans-serif;
color:var(--text);
line-height:1.6;
overflow-x:hidden;
}

img{
max-width:100%;
display:block;
}

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

section{
padding:80px 0;
}

h1,h2,h3{
margin-bottom:20px;
}

.section-title{
text-align:center;
margin-bottom:50px;
}

.section-title h2{
color:var(--primary);
}

/* =========================
BUTTONS
========================= */

.btn{
display:inline-block;
padding:14px 30px;
border-radius:6px;
text-decoration:none;
font-weight:600;
transition:.3s ease;
}

.btn-primary{
background:var(--primary);
color:var(--white);
}

.btn-primary:hover{
background:var(--primary-dark);
}

.btn-secondary{
background:var(--secondary);
color:var(--white);
}

.btn-secondary:hover{
background:var(--secondary-dark);
}

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

header{
position:fixed;
top:0;
width:100%;
background:var(--white);
z-index:1000;
box-shadow:0 2px 10px rgba(0,0,0,.08);
}

.navbar{
display:flex;
justify-content:space-between;
align-items:center;
padding:15px 0;
}

.logo img{
height:70px;
}

nav ul{
display:flex;
gap:30px;
list-style:none;
}

nav ul li a{
text-decoration:none;
color:var(--text);
font-weight:500;
transition:.3s;
}

nav ul li a:hover{
color:var(--primary);
}

.menu-toggle{
display:none;
font-size:32px;
cursor:pointer;
color:var(--primary);
}

/* =========================
HERO
========================= */

.hero{
padding-top:140px;
min-height:90vh;
display:flex;
align-items:center;
color:var(--white);
background:
linear-gradient(
    rgba(0,53,123,.85),
    rgba(0,53,123,.85)
),
url('../assets/images/bg.jpg');
background-size:cover;
background-position:center;
}

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

.hero h1{
font-size:58px;
line-height:1.2;
}

.hero p{
font-size:20px;
margin-bottom:30px;
}

/* =========================
COMMON GRIDS
========================= */

.stats-grid,
.course-grid,
.facility-grid,
.gallery-grid,
.contact-grid{
display:grid;
gap:25px;
}

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

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

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

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

/* =========================
CARDS
========================= */

.stat-box,
.course-card,
.facility{
background:var(--white);
border-radius:12px;
padding:30px;
}

.stat-box{
text-align:center;
box-shadow:0 5px 15px rgba(0,0,0,.05);
}

.course-card{
border:1px solid #eee;
transition:.3s;
}

.course-card:hover{
transform:translateY(-8px);
box-shadow:0 10px 25px rgba(0,0,0,.08);
}

.facility{
box-shadow:0 5px 15px rgba(0,0,0,.05);
}

.course-card h3,
.stat-box h3{
color:var(--primary);
}

.stat-box h3{
font-size:42px;
}

/* =========================
STATS
========================= */

.stats{
background:var(--light);
}

/* =========================
ABOUT
========================= */

.about-grid{
display:grid;
grid-template-columns:1fr 1fr;
gap:50px;
align-items:center;
}

.about-image{
position:relative;
overflow:hidden;
border-radius:20px;
box-shadow:0 15px 40px rgba(0,0,0,.15);
}

.about-image img{
width:100%;
height:450px;
object-fit:cover;
transition:.5s;
}

.about-image:hover img{
transform:scale(1.05);
}

.about-badge{
position:absolute;
bottom:20px;
left:20px;
background:var(--primary);
color:var(--white);
padding:20px 25px;
border-radius:12px;
}

.about-badge h3{
margin:0;
color:var(--secondary);
font-size:36px;
}

/* =========================
FACILITIES
========================= */

.facilities{
background:var(--light);
}

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

.gallery-item{
overflow:hidden;
border-radius:12px;
cursor:pointer;
}

.gallery-item img{
width:100%;
height:250px;
object-fit:cover;
transition:.4s;
}

.gallery-item img:hover{
transform:scale(1.08);
}

/* =========================
LIGHTBOX
========================= */

.modal {
    display:none;
    position:fixed;
    inset:0;
    background:rgba(0,0,0,.95);
    z-index:9999;
}

.modal-content {
    position:absolute;
    top:50%;
    left:50%;
    transform:translate(-50%,-50%);
    max-width:90%;
    max-height:90%;
    border-radius:10px;
    z-index:10000;
}

.close-modal{
position:absolute;
top:20px;
right:35px;
color:var(--white);
font-size:45px;
cursor:pointer;
}

.prev,
.next{
    position:absolute;
    top:50%;
    transform:translateY(-50%);
    color:#fff;
    font-size:45px;
    cursor:pointer;
    padding:10px 15px;
    background:rgba(0,0,0,0.4);
    border-radius:6px;
    z-index:10001;   /* VERY IMPORTANT */
}

.prev{left:20px;}
.next{right:20px;}

.prev:hover,
.next:hover{
color:var(--secondary);
}

/* =========================
CONTACT
========================= */

.contact{
background:var(--light);
}

form input,
form textarea{
width:100%;
padding:14px;
border:1px solid var(--border);
border-radius:6px;
margin-bottom:15px;
font:16px 'Poppins',sans-serif;
color:var(--text);
}

form input::placeholder,
form textarea::placeholder{
color:#777;
}

form button{
border:none;
cursor:pointer;
}

.form-group{
margin-bottom:20px;
}

.error{
display:block;
color:var(--danger);
font-size:13px;
margin-top:5px;
}

.invalid{
border:1px solid var(--danger) !important;
}

.valid{
border:1px solid var(--success) !important;
}

/* =========================
MAP
========================= */

.map-container{
width:100%;
height:350px;
overflow:hidden;
border-radius:12px;
box-shadow:0 5px 20px rgba(0,0,0,.1);
}

.map-container iframe{
width:100%;
height:100%;
border:none;
}

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

footer{
background:#111;
color:var(--white);
text-align:center;
padding:30px 0;
}

.social-links{
display:flex;
justify-content:center;
gap:15px;
margin-top:20px;
}

.social-links a{
width:45px;
height:45px;
background:#0d6efd;
color:var(--white);
border-radius:50%;
display:flex;
align-items:center;
justify-content:center;
text-decoration:none;
font-size:18px;
transition:.3s;
}

.social-links a:hover{
transform:translateY(-3px);
}

/* =========================
MOBILE
========================= */

@media(max-width:991px){

.hero h1{
    font-size:40px;
}

.about-grid,
.stats-grid,
.course-grid,
.facility-grid,
.gallery-grid,
.contact-grid{
    grid-template-columns:1fr;
}

.menu-toggle{
    display:block;
}

nav{
    display:none;
    position:absolute;
    top:100px;
    left:0;
    width:100%;
    background:var(--white);
    box-shadow:0 5px 15px rgba(0,0,0,.08);
}

nav.active{
    display:block;
}

nav ul{
    flex-direction:column;
    padding:20px;
    gap:15px;
}

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

.about-image img{
    height:350px;
}

nav.active {
    display: block;
    z-index: 9999;
}
}

@media(max-width:768px){
    .prev, .next{
        font-size:35px;
        padding:8px 12px;
        background:rgba(0,0,0,0.6);
    }

    .prev{ left:5px; }
    .next{ right:5px; }
}