```css id="advsty123"
/* Reset */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', sans-serif;
}

body {
    background: #f5f7fb;
    color: #1e293b;
    line-height: 1.6;
}

/* Header */
header {
    background: #0f172a;
    color: white;
    text-align: center;
    padding: 25px 10px;
    position: sticky;
    top: 0;
    z-index: 1000;
}

header h1 {
    font-size: 28px;
}

header p {
    font-size: 14px;
    color: #94a3b8;
}

nav {
    margin-top: 10px;
}

nav a {
    color: #cbd5f5;
    margin: 0 12px;
    text-decoration: none;
    font-size: 15px;
    position: relative;
    transition: 0.3s;
}

/* Navbar underline animation */
nav a::after {
    content: "";
    position: absolute;
    width: 0%;
    height: 2px;
    background: #38bdf8;
    left: 0;
    bottom: -5px;
    transition: 0.3s;
}

nav a:hover {
    color: #38bdf8;
}

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

/* Hero */
.hero {
    text-align: center;
    padding: 80px 20px;
}

.hero h2 {
    font-size: 32px;
    margin-bottom: 10px;
}

.hero p {
    color: #475569;
    margin-bottom: 20px;
}

/* Button */
.btn {
    display: inline-block;
    padding: 12px 25px;
    background: linear-gradient(135deg, #38bdf8, #0ea5e9);
    color: white;
    text-decoration: none;
    border-radius: 8px;
    transition: 0.3s;
}

.btn:hover {
    transform: scale(1.08);
    box-shadow: 0 8px 20px rgba(14,165,233,0.4);
}

/* Cards */
.card {
    background: white;
    margin: 30px auto;
    padding: 25px;
    max-width: 900px;
    border-radius: 12px;
    box-shadow: 0 8px 25px rgba(0,0,0,0.08);
    transition: 0.3s;
}

.card:hover {
    transform: translateY(-5px);
}

/* Skills */
.skills {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-top: 15px;
}

.skills span {
    background: #e0f2fe;
    padding: 10px 15px;
    border-radius: 6px;
    font-size: 14px;
    transition: 0.3s;
}

.skills span:hover {
    background: #38bdf8;
    color: white;
    transform: translateY(-5px) scale(1.05);
}

/* Projects */
.project {
    margin-top: 20px;
    padding: 15px;
    border-radius: 10px;
    background: #f8fafc;
    transition: 0.3s;
}

.project h3 {
    margin-bottom: 5px;
}

.project a {
    display: inline-block;
    margin-top: 8px;
    color: #2563eb;
    text-decoration: none;
    font-weight: bold;
}

.project a:hover {
    text-decoration: underline;
}

/* Hover animation */
.hover-card:hover {
    transform: translateY(-10px) scale(1.02);
    box-shadow: 0 12px 30px rgba(0,0,0,0.15);
}

/* Contact */
#contact a {
    color: #2563eb;
    text-decoration: none;
}

#contact a:hover {
    text-decoration: underline;
}

/* Footer */
footer {
    text-align: center;
    padding: 15px;
    background: #0f172a;
    color: white;
    margin-top: 40px;
}

/* Responsive */
@media (max-width: 768px) {
    .hero h2 {
        font-size: 24px;
    }

    .card {
        margin: 20px 15px;
    }

    nav a {
        display: inline-block;
        margin: 5px;
    }
}
```