:root{
--bg:#050816;
--card:#0f172a;
--text:#ffffff;
--muted:#94a3b8;
--border:#1e293b;
--blue:#3b82f6;
--input:#111827;
--shadow:rgba(0,0,0,0.35);
}

body.light-mode{
--bg:#f8fafc;
--card:#ffffff;
--text:#0f172a;
--muted:#475569;
--border:#e2e8f0;
--blue:#3b82f6;
--input:#f1f5f9;
--shadow:rgba(0,0,0,0.1);
}

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

html{
scroll-behavior:smooth;
}

body{
font-family:'Inter',sans-serif;
background-color:var(--bg);
color:var(--text);
overflow-x:hidden;
transition:background-color 0.4s ease, color 0.4s ease;
position:relative;
}

body::before{
content:"";
position:fixed;
top:0;
right:0;
width:100%;
height:100%;
background:
radial-gradient(circle at top right,rgba(59,130,246,0.12),transparent 30%),
linear-gradient(to bottom,var(--bg),#020617);
pointer-events:none;
z-index:-1;
transition:all 0.4s ease;
}

body.light-mode::before{
background:
radial-gradient(circle at top left,rgba(59,130,246,0.08),transparent 28%),
radial-gradient(circle at top right,rgba(99,102,241,0.08),transparent 24%),
#f8fafc;
}

.navbar{
position:fixed;
top:0;
width:100%;
padding:22px 8%;
display:flex;
justify-content:space-between;
align-items:center;
background:rgba(5,8,22,0.72);
backdrop-filter:blur(14px);
border-bottom:1px solid rgba(255,255,255,0.04);
z-index:1000;
transition:all 0.3s ease;
}

body.light-mode .navbar{
background:rgba(248,250,252,0.72);
border-bottom-color:rgba(0,0,0,0.08);
}

.logo{
display:flex;
align-items:center;
gap:12px;
font-size:21px;
font-weight:700;
color:var(--blue);
transition:transform 0.3s ease;
}

.logo:hover{
transform:scale(1.05);
}

.logo-dot{
width:11px;
height:11px;
border-radius:50%;
background:var(--blue);
box-shadow:0 0 14px var(--blue);
animation:pulse 2s infinite;
}

@keyframes pulse{
0%, 100%{
box-shadow:0 0 14px var(--blue);
}
50%{
box-shadow:0 0 28px var(--blue);
}
}

nav{
display:flex;
gap:30px;
}

nav a{
display:flex;
align-items:center;
gap:8px;
text-decoration:none;
font-size:15px;
color:var(--muted);
transition:all 0.2s ease;
position:relative;
}

nav a::after{
content:"";
position:absolute;
bottom:-4px;
left:0;
width:0;
height:2px;
background:var(--blue);
transition:width 0.3s ease;
}

nav a:hover{
color:var(--text);
}

nav a:hover::after{
width:100%;
}

.theme-btn{
width:46px;
height:46px;
border:none;
border-radius:16px;
background:rgba(255,255,255,0.04);
color:var(--text);
font-size:16px;
cursor:pointer;
transition:all 0.3s ease;
display:flex;
align-items:center;
justify-content:center;
}

body.light-mode .theme-btn{
background:rgba(0,0,0,0.06);
}

.theme-btn:hover{
transform:scale(1.1) rotate(20deg);
background:rgba(59,130,246,0.2);
}

.hero{
min-height:100vh;
display:flex;
justify-content:space-between;
align-items:center;
padding:0 8%;
gap:70px;
margin-top:80px;
position:relative;
overflow:hidden;
}

.hero-left{
max-width:760px;
animation:fadeInUp 0.8s ease;
}

@keyframes fadeInUp{
from{
opacity:0;
transform:translateY(30px);
}
to{
opacity:1;
transform:translateY(0);
}
}

.hero h1{
font-size:68px;
line-height:1.05;
font-weight:800;
letter-spacing:-3px;
max-width:760px;
background:linear-gradient(135deg, var(--blue), #60a5fa);
-webkit-background-clip:text;
-webkit-text-fill-color:transparent;
background-clip:text;
}

.alias{
margin-top:18px;
font-size:15px;
font-weight:600;
letter-spacing:2px;
color:#60a5fa;
}

.hero h2{
margin-top:34px;
font-size:32px;
line-height:1.5;
max-width:650px;
color:var(--text);
}

.desc{
margin-top:24px;
font-size:17px;
line-height:2;
color:var(--muted);
max-width:650px;
}

.hero-buttons{
margin-top:40px;
display:flex;
gap:16px;
flex-wrap:wrap;
}

.primary-btn{
padding:15px 30px;
border-radius:16px;
background:var(--blue);
color:white;
text-decoration:none;
font-weight:600;
transition:all 0.3s ease;
position:relative;
overflow:hidden;
}

.primary-btn::before{
content:"";
position:absolute;
top:0;
left:-100%;
width:100%;
height:100%;
background:rgba(255,255,255,0.2);
transition:left 0.3s ease;
}

.primary-btn:hover{
transform:translateY(-4px);
box-shadow:0 12px 24px rgba(59,130,246,0.3);
}

.primary-btn:hover::before{
left:100%;
}

.secondary-btn{
padding:15px 30px;
border-radius:16px;
background:rgba(255,255,255,0.03);
border:1px solid rgba(255,255,255,0.06);
color:var(--text);
text-decoration:none;
font-weight:600;
transition:all 0.3s ease;
}

body.light-mode .secondary-btn{
background:rgba(0,0,0,0.03);
border-color:rgba(0,0,0,0.08);
}

.secondary-btn:hover{
transform:translateY(-4px);
border-color:var(--blue);
background:rgba(59,130,246,0.1);
}

.socials{
margin-top:42px;
display:flex;
gap:16px;
flex-wrap:wrap;
}

.socials a{
width:52px;
height:52px;
display:flex;
justify-content:center;
align-items:center;
border-radius:18px;
background:rgba(255,255,255,0.03);
border:1px solid rgba(255,255,255,0.05);
transition:all 0.3s ease;
position:relative;
overflow:hidden;
}

body.light-mode .socials a{
background:rgba(0,0,0,0.03);
border-color:rgba(0,0,0,0.08);
}

.socials a::before{
content:"";
position:absolute;
top:50%;
left:50%;
width:0;
height:0;
background:rgba(59,130,246,0.2);
border-radius:50%;
transform:translate(-50%,-50%);
transition:width 0.6s, height 0.6s;
}

.socials a:hover::before{
width:100px;
height:100px;
}

.socials a:hover{
transform:translateY(-5px);
border-color:rgba(59,130,246,0.4);
}

.socials img{
width:22px;
height:22px;
object-fit:contain;
filter:brightness(0) invert(1);
opacity:0.9;
position:relative;
z-index:1;
transition:transform 0.3s ease;
}

.socials a:hover img{
transform:scale(1.2);
}

body.light-mode .socials img{
filter:brightness(1) invert(0);
}

.profile-box{
width:340px;
height:340px;
border-radius:32px;
background:linear-gradient(160deg,rgba(255,255,255,0.04),rgba(255,255,255,0.015));
border:1px solid rgba(255,255,255,0.05);
display:flex;
justify-content:center;
align-items:center;
overflow:hidden;
backdrop-filter:blur(14px);
padding:0;
box-shadow:0 20px 60px var(--shadow);
animation:float 3s ease-in-out infinite;
}

body.light-mode .profile-box{
background:linear-gradient(160deg,rgba(0,0,0,0.04),rgba(0,0,0,0.015));
border-color:rgba(0,0,0,0.08);
box-shadow:0 20px 60px var(--shadow);
}

@keyframes float{
0%, 100%{
transform:translateY(0px);
}
50%{
transform:translateY(-20px);
}
}

.profile-box img{
width:100%;
height:100%;
object-fit:cover;
border-radius:0;
border:none;
transition:transform 0.3s ease;
}

.profile-box:hover img{
transform:scale(1.05);
}

.section{
padding:85px 8%;
position:relative;
z-index:1;
}

.section-title{
font-size:34px;
margin-bottom:26px;
background:linear-gradient(135deg, var(--text), var(--muted));
-webkit-background-clip:text;
-webkit-text-fill-color:transparent;
background-clip:text;
font-weight:700;
}

.about-box{
position:relative;
max-width:820px;
padding:80px 38px 38px;
border-radius:26px;
background:linear-gradient(180deg,rgba(7,17,31,0.6),rgba(2,8,23,0.6));
border:1px solid rgba(59,130,246,0.16);
overflow:hidden;
box-shadow:0 20px 60px var(--shadow);
transition:all 0.3s ease;
}

body.light-mode .about-box{
background:linear-gradient(180deg,rgba(248,250,252,0.8),rgba(241,245,249,0.8));
border-color:rgba(59,130,246,0.08);
}

.about-box::before{
content:"";
position:absolute;
top:0;
left:0;
width:100%;
height:56px;
background:var(--card);
border-bottom:1px solid rgba(255,255,255,0.05);
}

.about-box::after{
content:"";
position:absolute;
top:21px;
left:22px;
width:11px;
height:11px;
border-radius:50%;
background:#ff5f56;
box-shadow:22px 0 #ffbd2e,44px 0 #27c93f;
}

.about-box:hover{
transform:translateY(-5px);
border-color:rgba(59,130,246,0.3);
}

.about-box p{
font-size:16px;
line-height:2.1;
color:var(--muted);
}

.about-box strong{
color:var(--text);
font-weight:600;
}

/* TERMINAL ABOUT BOX STYLES */
.about-terminal{
max-width:820px;
border-radius:16px;
background:#0f172a;
border:1px solid rgba(59,130,246,0.2);
overflow:hidden;
box-shadow:0 25px 60px rgba(59,130,246,0.15);
transition:all 0.4s ease;
}

body.light-mode .about-terminal{
background:#ffffff;
border-color:rgba(59,130,246,0.15);
box-shadow:0 25px 60px rgba(59,130,246,0.08);
}

.about-terminal:hover{
border-color:rgba(59,130,246,0.3);
box-shadow:0 35px 80px rgba(59,130,246,0.2);
transform:translateY(-5px);
}

.terminal-header{
padding:16px 20px;
background:#1e293b;
border-bottom:1px solid rgba(59,130,246,0.1);
display:flex;
justify-content:space-between;
align-items:center;
gap:20px;
}

body.light-mode .terminal-header{
background:#f1f5f9;
border-bottom-color:rgba(59,130,246,0.08);
}

.terminal-buttons{
display:flex;
gap:8px;
}

.terminal-buttons span{
width:12px;
height:12px;
border-radius:50%;
cursor:pointer;
}

.btn-red{
background:#ff5f56;
box-shadow:0 0 10px rgba(255,95,86,0.3);
}

.btn-yellow{
background:#ffbd2e;
box-shadow:0 0 10px rgba(255,189,46,0.3);
}

.btn-green{
background:#27c93f;
box-shadow:0 0 10px rgba(39,201,63,0.3);
}

.terminal-title{
font-size:13px;
color:var(--muted);
font-family:'Monaco','Courier New',monospace;
font-weight:500;
}

body.light-mode .terminal-title{
color:#64748b;
}

.terminal-body{
padding:28px;
font-family:'Monaco','Courier New',monospace;
font-size:14px;
line-height:1.8;
color:#cbd5e1;
background:#0f172a;
overflow-x:auto;
}

body.light-mode .terminal-body{
background:#ffffff;
color:#1e293b;
}

.terminal-line{
display:flex;
align-items:center;
gap:8px;
min-height:24px;
}

.terminal-prompt{
color:#3b82f6;
font-weight:600;
user-select:none;
}

.terminal-text{
color:#60a5fa;
}

body.light-mode .terminal-text{
color:#2563eb;
}

.terminal-output{
color:#cbd5e1;
}

body.light-mode .terminal-output{
color:#475569;
}

.terminal-output-goal{
color:#4ade80;
}

body.light-mode .terminal-output-goal{
color:#16a34a;
}

.terminal-cursor{
display:inline-block;
width:2px;
height:20px;
background:#3b82f6;
animation:blink 1s infinite;
margin-left:4px;
}

@keyframes blink{
0%, 49%{
background:#3b82f6;
opacity:1;
}
50%, 100%{
background:#3b82f6;
opacity:0;
}
}

/* Line by line stagger animation */
.about-terminal .terminal-line{
animation:slideIn 0.6s ease forwards;
opacity:0;
}

.terminal-line:nth-child(1){ animation-delay:0.1s; }
.terminal-line:nth-child(2){ animation-delay:0.15s; }
.terminal-line:nth-child(3){ animation-delay:0.2s; }
.terminal-line:nth-child(4){ animation-delay:0.25s; }
.terminal-line:nth-child(5){ animation-delay:0.3s; }
.terminal-line:nth-child(6){ animation-delay:0.35s; }
.terminal-line:nth-child(7){ animation-delay:0.4s; }
.terminal-line:nth-child(8){ animation-delay:0.45s; }
.terminal-line:nth-child(9){ animation-delay:0.5s; }
.terminal-line:nth-child(10){ animation-delay:0.55s; }
.terminal-line:nth-child(11){ animation-delay:0.6s; }
.terminal-line:nth-child(12){ animation-delay:0.65s; }
.terminal-line:nth-child(13){ animation-delay:0.7s; }
.terminal-line:nth-child(14){ animation-delay:0.75s; }
.terminal-line:nth-child(15){ animation-delay:0.8s; }
.terminal-line:nth-child(16){ animation-delay:0.85s; }
.terminal-line:nth-child(17){ animation-delay:0.9s; }

@keyframes slideIn{
from{
opacity:0;
transform:translateX(-10px);
}
to{
opacity:1;
transform:translateX(0);
}
}

/* Hover effect on terminal body */
.about-terminal:hover .terminal-line{
transition:all 0.2s ease;
}

.about-terminal:hover .terminal-output{
color:#a78bfa;
}

.about-terminal:hover .terminal-output-goal{
color:#4ade80;
text-shadow:0 0 10px rgba(74,222,128,0.3);
}

.skills-grid{
display:grid;
grid-template-columns:repeat(auto-fit,minmax(180px,1fr));
gap:16px;
}

.skill-card{
padding:24px;
border-radius:22px;
background:linear-gradient(145deg,rgba(255,255,255,0.04),rgba(255,255,255,0.02));
border:1px solid rgba(255,255,255,0.05);
display:flex;
align-items:center;
gap:14px;
transition:all 0.3s ease;
cursor:pointer;
position:relative;
overflow:hidden;
}

body.light-mode .skill-card{
background:linear-gradient(145deg,rgba(0,0,0,0.03),rgba(0,0,0,0.01));
border-color:rgba(0,0,0,0.08);
}

.skill-card::before{
content:"";
position:absolute;
top:0;
left:-100%;
width:100%;
height:100%;
background:rgba(59,130,246,0.05);
transition:left 0.3s ease;
z-index:0;
}

.skill-card:hover::before{
left:100%;
}

.skill-card:hover{
transform:translateY(-5px);
border-color:rgba(59,130,246,0.3);
}

.skill-card i{
font-size:24px;
color:var(--blue);
transition:transform 0.3s ease;
position:relative;
z-index:1;
}

.skill-card:hover i{
transform:rotate(360deg) scale(1.2);
}

.skill-card span{
font-size:16px;
font-weight:600;
position:relative;
z-index:1;
}

.projects-grid{
display:grid;
grid-template-columns:repeat(auto-fit,minmax(340px,420px));
gap:22px;
}

.project-card{
padding:26px;
border-radius:24px;
background:linear-gradient(160deg,rgba(255,255,255,0.04),rgba(255,255,255,0.02));
border:1px solid rgba(255,255,255,0.05);
transition:all 0.3s ease;
width:100%;
position:relative;
overflow:hidden;
display:flex;
flex-direction:column;
}

body.light-mode .project-card{
background:linear-gradient(160deg,rgba(0,0,0,0.03),rgba(0,0,0,0.01));
border-color:rgba(0,0,0,0.08);
}

.project-card::before{
content:"";
position:absolute;
top:-50%;
right:-50%;
width:200%;
height:200%;
background:radial-gradient(circle,rgba(59,130,246,0.1),transparent);
opacity:0;
transition:opacity 0.3s ease;
pointer-events:none;
}

.project-card:hover::before{
opacity:1;
}

.project-card:hover{
transform:translateY(-6px);
border-color:rgba(59,130,246,0.25);
}

.project-icon{
width:54px;
height:54px;
border-radius:18px;
display:flex;
justify-content:center;
align-items:center;
background:rgba(59,130,246,0.12);
color:var(--blue);
font-size:22px;
margin-bottom:24px;
transition:all 0.3s ease;
}

.project-card:hover .project-icon{
transform:scale(1.2) rotate(-10deg);
box-shadow:0 8px 16px rgba(59,130,246,0.3);
}

.project-card h4{
font-size:26px;
color:var(--text);
}

.project-card p{
margin-top:14px;
font-size:15px;
line-height:1.8;
color:var(--muted);
flex-grow:1;
}

.tech-stack{
margin-top:20px;
display:flex;
flex-wrap:wrap;
gap:10px;
}

.tech-stack span{
padding:8px 12px;
border-radius:999px;
font-size:12px;
background:rgba(59,130,246,0.12);
color:var(--blue);
transition:all 0.2s ease;
}

.tech-stack span:hover{
background:rgba(59,130,246,0.25);
transform:scale(1.05);
}

.project-links{
margin-top:24px;
display:flex;
gap:14px;
}

.visit-btn,
.github-btn{
flex:1;
height:50px;
border-radius:14px;
display:flex;
justify-content:center;
align-items:center;
gap:10px;
text-decoration:none;
font-weight:600;
transition:all 0.3s ease;
position:relative;
overflow:hidden;
border:none;
cursor:pointer;
}

.visit-btn{
background:rgba(59,130,246,0.14);
color:var(--blue);
}

.github-btn{
background:rgba(255,255,255,0.03);
border:1px solid rgba(255,255,255,0.06);
color:var(--text);
}

body.light-mode .github-btn{
background:rgba(0,0,0,0.03);
border-color:rgba(0,0,0,0.08);
}

.visit-btn:hover,
.github-btn:hover{
transform:translateY(-3px);
}

.visit-btn:hover{
background:rgba(59,130,246,0.25);
box-shadow:0 8px 16px rgba(59,130,246,0.2);
}

.contact-wrapper{
max-width:760px;
animation:fadeInUp 1s ease;
}

.contact-form{
padding:38px;
border-radius:30px;
background:linear-gradient(160deg,rgba(255,255,255,0.05),rgba(255,255,255,0.02));
border:1px solid rgba(255,255,255,0.05);
display:flex;
flex-direction:column;
gap:20px;
backdrop-filter:blur(12px);
transition:all 0.3s ease;
}

body.light-mode .contact-form{
background:linear-gradient(160deg,rgba(0,0,0,0.03),rgba(0,0,0,0.01));
border-color:rgba(0,0,0,0.08);
}

.contact-form:hover{
border-color:rgba(59,130,246,0.2);
}

.contact-form input,
.contact-form textarea{
padding:15px;
border-radius:12px;
border:1px solid rgba(255,255,255,0.05);
background:var(--input);
color:var(--text);
font-family:'Inter',sans-serif;
transition:all 0.3s ease;
}

body.light-mode .contact-form input,
body.light-mode .contact-form textarea{
background:rgba(0,0,0,0.03);
border-color:rgba(0,0,0,0.08);
}

.contact-form input::placeholder,
.contact-form textarea::placeholder{
color:var(--muted);
}

.contact-form input:focus,
.contact-form textarea:focus{
outline:none;
border-color:var(--blue);
background:rgba(59,130,246,0.05);
box-shadow:0 0 0 3px rgba(59,130,246,0.1);
}

.contact-form button{
padding:15px;
border-radius:12px;
background:var(--blue);
color:white;
border:none;
font-weight:600;
cursor:pointer;
transition:all 0.3s ease;
display:flex;
align-items:center;
justify-content:center;
gap:10px;
position:relative;
overflow:hidden;
}

.contact-form button::before{
content:"";
position:absolute;
top:0;
left:-100%;
width:100%;
height:100%;
background:rgba(255,255,255,0.2);
transition:left 0.3s ease;
}

.contact-form button:hover{
transform:translateY(-3px);
box-shadow:0 12px 24px rgba(59,130,246,0.3);
}

.contact-form button:hover::before{
left:100%;
}

footer{
padding:30px 8%;
text-align:center;
color:var(--muted);
border-top:1px solid rgba(255,255,255,0.05);
background:rgba(255,255,255,0.02);
transition:all 0.3s ease;
}

body.light-mode footer{
border-top-color:rgba(0,0,0,0.08);
background:rgba(0,0,0,0.02);
}

/* Scroll animations */
.fade-in{
opacity:0;
transform:translateY(20px);
transition:all 0.6s ease;
}

.fade-in.visible{
opacity:1;
transform:translateY(0);
}

@media(max-width:1100px){

.hero{
flex-direction:column;
justify-content:center;
padding-top:150px;
text-align:center;
gap:50px;
}

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

.hero h1{
font-size:52px;
}

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

nav{
display:none;
}

}

@media(max-width:768px){

.section{
padding:70px 6%;
}

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

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

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

.contact-form{
padding:24px;
}

.about-terminal{
border-radius:14px;
}

.terminal-header{
padding:14px 16px;
flex-direction:column;
gap:12px;
}

.terminal-title{
font-size:12px;
}

.terminal-body{
padding:20px;
font-size:13px;
line-height:1.6;
}

.terminal-line{
min-height:22px;
gap:6px;
}

.hero{
gap:50px;
}

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

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

.desc{
font-size:15px;
}

.socials{
flex-wrap:wrap;
justify-content:center;
}

.profile-box{
width:100%;
height:300px;
}

.profile-box img{
width:180px;
height:180px;
}

.hero-buttons{
flex-direction:column;
width:100%;
}

.primary-btn,
.secondary-btn{
width:100%;
text-align:center;
}

.navbar{
padding:16px 6%;
}

}

@media(max-width:600px){

.navbar{
padding:14px 4%;
}

.logo{
font-size:18px;
}

nav{
display:none;
}

.hero{
padding-top:110px;
gap:32px;
}

.hero h1{
font-size:36px;
letter-spacing:-1px;
}

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

.hero-buttons{
gap:12px;
}

.primary-btn,
.secondary-btn{
padding:12px 24px;
font-size:14px;
}

.profile-box{
width:230px;
height:230px;
border-radius:24px;
}

.section-title{
font-size:28px;
}

.about-terminal{
border-radius:12px;
box-shadow:0 15px 40px rgba(59,130,246,0.1);
}

.terminal-header{
padding:12px 14px;
gap:10px;
font-size:11px;
}

.terminal-buttons span{
width:10px;
height:10px;
}

.terminal-body{
padding:16px;
font-size:12px;
line-height:1.5;
}

.terminal-line{
min-height:20px;
gap:4px;
}

.terminal-prompt,
.terminal-text,
.terminal-output,
.terminal-output-goal{
font-size:12px;
}

.skills-grid{
grid-template-columns:1fr;
gap:18px;
}

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

.contact-form{
padding:20px;
gap:16px;
}

.contact-form input,
.contact-form textarea{
padding:12px;
font-size:14px;
}

.socials{
gap:12px;
flex-wrap:wrap;
}

}

/* --- New Cybersecurity Features CSS --- */

/* GitHub Stats */
.github-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: 24px;
  margin-bottom: 50px;
  width: 100%;
}
.github-stats img {
  width: 100%;
  height: auto;
  border-radius: 12px;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  box-shadow: 0 4px 20px rgba(0,0,0,0.1);
}
.github-stats img:hover {
  transform: translateY(-5px);
  box-shadow: 0 8px 30px rgba(59,130,246,0.15);
}
.stats-light {
  display: none;
}
body.light-mode .stats-dark {
  display: none;
}
body.light-mode .stats-light {
  display: block;
}

#matrix-bg {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: -1;
  opacity: 0.1;
}
body.light-mode #matrix-bg {
  opacity: 0.05;
}

/* Scroll To Top Button */
#scrollTopBtn {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: var(--blue);
  color: white;
  border: none;
  font-size: 20px;
  cursor: pointer;
  box-shadow: 0 4px 12px rgba(59, 130, 246, 0.4);
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
  z-index: 1000;
  display: flex;
  justify-content: center;
  align-items: center;
}
#scrollTopBtn.visible {
  opacity: 1;
  visibility: visible;
}
#scrollTopBtn:hover {
  transform: translateY(-5px);
  background: #2563eb;
}