/* Reset và Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
body {
    font-family: "Poppins", sans-serif;
    line-height: 1.6;
    color: #fff;
    background: linear-gradient(135deg, #0a0a0a 0%, #1a1a2e 50%, #16213e 100%);
    overflow-x: hidden;
}
/* Header */
header {
    background: rgba(10, 10, 10, 0.9);
    backdrop-filter: blur(10px);
    color: white;
    text-align: center;
    padding: 60px 20px;
    position: relative;
}
h1 { 
    margin: 0; 
    font-size: 2.5em; 
    color: #00d4ff;
}
h2 { 
    color: #00d4ff; 
    text-transform: uppercase; 
    border-bottom: 2px solid #00d4ff; 
    padding-bottom: 10px; 
    margin-bottom: 20px; 
    position: relative;
}
h2::after {
    content: "";
    width: 50px;
    height: 3px;
    background: #00d4ff;
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
}
section {
    max-width: 1200px;
    margin: 40px auto;
    padding: 30px;
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(10px);
    box-shadow: 0 0 15px rgba(0,0,0,0.1);
    border-radius: 15px;
}
/* About */
#about p {
    font-size: 1.1em;
    text-align: justify;
    max-width: 800px;
    margin: 0 auto 30px;
    opacity: 0.9;
}
.services {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-top: 40px;
}
.service-card {
    background: rgba(255, 255, 255, 0.05);
    padding: 30px;
    border-radius: 15px;
    text-align: center;
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    backdrop-filter: blur(10px);
}
.service-card:hover { 
    transform: scale(1.05); 
    box-shadow: 0 20px 40px rgba(0, 212, 255, 0.2);
}
.service-icon { 
    font-size: 3em; 
    margin-bottom: 15px; 
}
/* Skills */
.technologies {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 20px;
    margin-top: 20px;
}
.tech-item {
    text-align: center;
    padding: 15px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 8px;
    border-left: 4px solid #00d4ff;
    backdrop-filter: blur(10px);
}
.tech-icon {
    width: 60px;
    height: 60px;
    margin-bottom: 10px;
    border-radius: 50%;
    object-fit: contain;
}
/* Experiences & Projects */
.experiences, .projects {
    display: grid;
    gap: 30px;
}
.exp-item, .proj-item {
    background: rgba(255, 255, 255, 0.05);
    padding: 25px;
    border-radius: 15px;
    border-left: 5px solid #00d4ff;
    backdrop-filter: blur(10px);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}
.exp-item:hover, .proj-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 212, 255, 0.2);
}
.exp-title, .proj-name { 
    font-size: 1.3em; 
    font-weight: bold; 
    color: #00d4ff; 
    margin-bottom: 10px; 
}
.exp-company { 
    font-style: italic; 
    color: #ccc; 
    margin-bottom: 15px; 
}
.exp-date { 
    color: #00d4ff; 
    font-weight: bold; 
    margin-bottom: 15px; 
}
.exp-points { 
    list-style-type: none; 
    padding: 0; 
}
.exp-points li { 
    margin: 10px 0; 
    padding-left: 20px; 
    position: relative; 
    opacity: 0.8;
}
.exp-points li::before { 
    content: "→"; 
    color: #00d4ff; 
    font-weight: bold; 
    position: absolute; 
    left: 0; 
}
.proj-desc { 
    margin-bottom: 15px; 
    opacity: 0.8;
}
.proj-image {
    width: 100%;
    max-width: 400px;
    height: 250px;
    object-fit: cover;
    border-radius: 8px;
    margin-bottom: 15px;
}
.proj-tags { 
    display: flex; 
    flex-wrap: wrap; 
    gap: 5px; 
    margin-bottom: 15px; 
}
.proj-tag { 
    background: rgba(0, 212, 255, 0.2); 
    color: #00d4ff; 
    padding: 5px 10px; 
    border-radius: 15px; 
    font-size: 0.9em; 
}
.proj-links { 
    display: flex; 
    gap: 10px; 
}
.proj-links a { 
    color: #00d4ff; 
    text-decoration: none; 
    font-weight: bold; 
}
.proj-links a:hover { 
    color: #ff00ff; 
}
/* Testimonials */
.testimonials {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
    margin-top: 20px;
}
.testimonial {
    background: rgba(255, 255, 255, 0.05);
    padding: 20px;
    border-radius: 15px;
    text-align: center;
    font-style: italic;
    backdrop-filter: blur(10px);
}
/* Certificates */
.cert-item {
    display: flex;
    align-items: center;
    margin: 15px 0;
    padding: 15px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 15px;
    border-left: 4px solid #00d4ff;
    backdrop-filter: blur(10px);
}
.cert-image {
    width: 100px;
    height: 140px;
    object-fit: cover;
    border-radius: 5px;
    margin-right: 15px;
}
.cert-desc { 
    flex: 1; 
    opacity: 0.9;
}
/* Footer */
footer {
    text-align: center;
    padding: 20px;
    background: rgba(0, 0, 0, 0.5);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    margin-top: 40px;
}
.socials { 
    display: flex; 
    justify-content: center; 
    gap: 20px; 
    margin-top: 20px; 
}
.socials a { 
    color: #00d4ff; 
    font-size: 1.5em; 
    text-decoration: none; 
}
.socials a:hover {
    color: #ff00ff;
}
/* Link Styling */
a {
    color: #00d4ff;
    text-decoration: none;
    transition: color 0.3s ease, opacity 0.3s ease;
}
a:hover {
    color: #ff00ff;
    opacity: 0.9;
}
a:visited {
    color: #00a6cc;
}
/* Animations */
@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(30px); }
    to { opacity: 1; transform: translateY(0); }
}
@keyframes fadeInRight {
    from { opacity: 0; transform: translateX(30px); }
    to { opacity: 1; transform: translateX(0); }
}
/* Responsive */
@media (max-width: 768px) {
    section { 
        margin: 20px; 
        padding: 20px; 
    }
    h1 { 
        font-size: 2em; 
    }
    .services { 
        grid-template-columns: 1fr; 
    }
    .cert-item { 
        flex-direction: column; 
        text-align: center; 
    }
    .cert-image { 
        margin-right: 0; 
        margin-bottom: 10px; 
    }
}