:root{
--bg:#0f172a;
--bg2:#111827;
--card:rgba(255,255,255,.08);
--text:#f8fafc;
--muted:#cbd5e1;
--primary:#38bdf8;
--secondary:#8b5cf6;
--border:rgba(255,255,255,.12);
--shadow:0 15px 40px rgba(0,0,0,.35);
--surface:rgba(255,255,255,.08);
}

*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
font-family:'Poppins',sans-serif;
background:linear-gradient(135deg,var(--bg),var(--bg2));
color:var(--text);
line-height:1.7;
}


.section-header{

text-align:center;

margin-bottom:60px;

}

.section-subtitle{

max-width:700px;

margin:auto;

margin-top:15px;

color:var(--muted);

font-size:17px;

}

.container{
width:min(1150px,92%);
margin:auto;
}


.header{
position:fixed;
top:0;
width:100%;
backdrop-filter:blur(14px);
background:rgba(15,23,42,.75);
border-bottom:1px solid var(--border);
z-index:1000;
}

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

.logo{
font-size:1.8rem;
font-weight:700;
text-decoration:none;
color:#fff;
}

.logo span{color:var(--primary)}

.navbar{
display:flex;
gap:30px;
}

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

.navbar a:hover,
.navbar a.active{
color:var(--primary);
}

.nav-actions{
display:flex;
gap:12px;
}

.nav-actions button{
width:45px;
height:45px;
border-radius:50%;
border:none;
cursor:pointer;
background:var(--card);
color:#fff;
}

.hero{
padding:140px 0 80px;
min-height:100vh;
display:flex;
align-items:center;
}

.hero-grid{
display:grid;
grid-template-columns:1.1fr .9fr;
gap:60px;
align-items:center;
}

.tag{
display:inline-block;
padding:8px 18px;
border-radius:999px;
background:rgba(56,189,248,.15);
color:var(--primary);
margin-bottom:20px;
}

.hero h1{
font-size:3.8rem;
line-height:1.1;
margin-bottom:10px;
}

.hero h1 span{
background:linear-gradient(90deg,var(--primary),var(--secondary));
-webkit-background-clip:text;
color:transparent;
}

.hero h2{
font-size:2rem;
margin-bottom:18px;
}

.hero p{
color:var(--muted);
max-width:620px;
}

.hero-buttons{
display:flex;
gap:18px;
margin:35px 0;
}

.btn{
padding:14px 30px;
border-radius:12px;
text-decoration:none;
font-weight:600;
transition:.35s;
display:inline-block;
}

.primary{
background:linear-gradient(90deg,var(--primary),var(--secondary));
color:#fff;
}

.secondary{
border:1px solid var(--primary);
color:#fff;
}

.btn:hover{
transform:translateY(-4px);
box-shadow:var(--shadow);
}

.socials{
display:flex;
gap:16px;
}

.socials a{
width:46px;
height:46px;
display:grid;
place-items:center;
background:var(--card);
border-radius:50%;
color:#fff;
text-decoration:none;
transition:.3s;
}

.socials a:hover{
background:var(--primary);
transform:translateY(-4px);
}

.profile-card{
background:var(--card);
padding:22px;
border-radius:30px;
border:1px solid var(--border);
box-shadow:var(--shadow);
}

.profile-card img{
width:100%;
border-radius:22px;
display:block;
}

.section{
padding:100px 0;
}

.section-title{
font-size:2.5rem;
text-align:center;
margin-bottom:55px;
position:relative;
}

.section-title::after{
content:"";
display:block;
width:90px;
height:4px;
background:linear-gradient(90deg,var(--primary),var(--secondary));
margin:14px auto 0;
border-radius:20px;
}

.about-grid,
.skills-grid,
.project-grid{
display:grid;
gap:24px;
}

.about-grid{
grid-template-columns:repeat(auto-fit,minmax(220px,1fr));
margin-top:40px;
}

.info-card,
.skill,
.project-card,
.timeline-item,
.contact-form{
background:var(--card);
border:1px solid var(--border);
border-radius:20px;
padding:24px;
backdrop-filter:blur(12px);
}

.skills-grid{
grid-template-columns:repeat(auto-fit,minmax(180px,1fr));
}

.skill{
text-align:center;
font-weight:600;
transition:.3s;
}




.skill:hover,
.project-card:hover,
.info-card:hover{
transform:translateY(-8px);
box-shadow:var(--shadow);
}



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

.hero-content{

display:flex;

flex-direction:column;

justify-content:center;

}

.hero-tag{

display:inline-block;

width:fit-content;

padding:8px 18px;

margin-bottom:20px;

border-radius:50px;

background:rgba(56,189,248,.15);

color:var(--primary);

font-size:15px;

font-weight:600;

letter-spacing:.5px;

}

.hero-description{

margin:25px 0;

font-size:17px;

color:var(--muted);

line-height:1.8;

max-width:620px;

}

.hero-buttons{

display:flex;

gap:20px;

margin:30px 0;

flex-wrap:wrap;

}

.hero-social{

display:flex;

align-items:center;

gap:18px;

margin-top:15px;

}

.hero-social a{

width:48px;

height:48px;

display:flex;

justify-content:center;

align-items:center;

border-radius:50%;

background:var(--card);

border:1px solid var(--border);

color:var(--text);

font-size:20px;

transition:.35s;

text-decoration:none;

}

.hero-social a:hover{

background:linear-gradient(90deg,var(--primary),var(--secondary));

color:#fff;

transform:translateY(-6px);

box-shadow:var(--shadow);

}

.profile-wrapper{

position:relative;

width:380px;

height:380px;

margin:auto;

display:flex;

justify-content:center;

align-items:center;

}

.profile-wrapper img{

width:100%;

height:100%;

object-fit:cover;

border-radius:50%;

border:6px solid rgba(255,255,255,.08);

box-shadow:var(--shadow);

position:relative;

z-index:2;

}

.circle{

position:absolute;

width:410px;

height:410px;

border-radius:50%;

background:linear-gradient(135deg,var(--primary),var(--secondary));

filter:blur(90px);

opacity:.25;

animation:float 6s ease-in-out infinite;

z-index:1;

}

@keyframes float{

0%{

transform:translateY(0px);

}

50%{

transform:translateY(-20px);

}

100%{

transform:translateY(0px);

}

}




.project-grid{
grid-template-columns:repeat(auto-fit,minmax(320px,1fr));
}

.contact-form{
display:flex;
flex-direction:column;
gap:18px;
max-width:700px;
margin:auto;
}

.contact-form input,
.contact-form textarea{
padding:16px;
border-radius:12px;
border:1px solid var(--border);
background:#0b1220;
color:#fff;
}

.contact-form textarea{
min-height:180px;
resize:vertical;
}

footer{
padding:35px 0;
text-align:center;
border-top:1px solid var(--border);
color:var(--muted);
}

@media(max-width:900px){
.hero-grid{
grid-template-columns:1fr;
text-align:center;
}
.hero-buttons,.socials{
justify-content:center;
}
.navbar{
display:none;
}
.hero h1{
font-size:2.8rem;
}
}

@media(max-width:600px){
.section{
padding:70px 0;
}
.hero{
padding-top:120px;
}
.hero h1{
font-size:2.2rem;
}
.hero h2{
font-size:1.4rem;
}
}



/* ===========================
      EXPERIENCE SECTION
=========================== */

.timeline{
    position:relative;
    margin-top:50px;
    padding-left:40px;
}

.timeline::before{
    content:"";
    position:absolute;
    left:15px;
    top:0;
    width:3px;
    height:100%;
    background:linear-gradient(var(--primary),var(--secondary));
}

.timeline-item{
    position:relative;
    margin-bottom:45px;
}

.timeline-dot{
    position:absolute;
    left:-33px;
    top:8px;
    width:18px;
    height:18px;
    border-radius:50%;
    background:var(--primary);
    border:4px solid #fff;
}

.timeline-content{
    background:var(--surface);
    padding:25px;
    border-radius:18px;
    border:1px solid var(--border);
    transition:.3s;
}

.timeline-content:hover{
    transform:translateX(8px);
}

.timeline-year{
    display:inline-block;
    margin-bottom:10px;
    padding:5px 12px;
    border-radius:30px;
    background:rgba(56,189,248,.15);
    color:var(--primary);
    font-weight:600;
}




/* =====================================
      RESEARCH SECTION
===================================== */

.research-grid{

display:grid;

grid-template-columns:repeat(auto-fit,minmax(360px,1fr));

gap:30px;

margin-top:40px;

}

.research-card{

background:var(--surface);

padding:30px;

border-radius:20px;

border:1px solid var(--border);

transition:.4s;

position:relative;

overflow:hidden;

}

.research-card:hover{

transform:translateY(-10px);

box-shadow:var(--shadow);

}

.research-icon{

width:70px;

height:70px;

display:flex;

justify-content:center;

align-items:center;

font-size:28px;

border-radius:50%;

background:rgba(56,189,248,.15);

color:var(--primary);

margin-bottom:20px;

}

.badge{

position:absolute;

top:20px;

right:20px;

padding:6px 15px;

border-radius:30px;

background:#10b981;

color:white;

font-size:13px;

font-weight:600;

}

.badge.patent{

background:#8b5cf6;

}

.research-card h3{

margin-bottom:10px;

}

.research-card h4{

margin-bottom:15px;

color:var(--primary);

}

.research-card p{

color:var(--muted);

margin-bottom:20px;

}

.research-tags{

display:flex;

flex-wrap:wrap;

gap:10px;

margin-bottom:20px;

}

.research-tags span{

padding:8px 14px;

border-radius:30px;

background:rgba(255,255,255,.08);

font-size:14px;

}

.research-buttons{

display:flex;

gap:15px;

}