:root {
    --bg-main: #f0f9ff; 
    --bg-card: #ffffff; 
    --primary: #0ea5e9; 
    --primary-dark: #0284c7; 
    --primary-light: #e0f2fe; 
    --text-dark: #0f172a; 
    --text-muted: #64748b; 
    --shadow-soft: 0 10px 40px -10px rgba(14, 165, 233, 0.15); 
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Poppins', sans-serif;
    text-decoration: none;
    list-style: none;
    scroll-behavior: smooth;
}

body {
    background-color: var(--bg-main);
    color: var(--text-dark);
    line-height: 1.7;
    overflow-x: hidden;
}

header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    padding: 1.5rem 8%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 1000;
    transition: var(--transition);
}

header.scrolled {
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    box-shadow: 0 4px 20px rgba(0,0,0,0.05);
    padding: 1rem 8%;
}

.logo { font-size: 1.5rem; font-weight: 700; color: var(--text-dark); }
.logo span { color: var(--primary); }

.navbar { display: flex; gap: 2rem; }
.navbar a {
    color: var(--text-muted);
    font-weight: 500;
    font-size: 0.95rem;
    position: relative;
    transition: var(--transition);
}

.navbar a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary);
    transition: var(--transition);
}

.navbar a:hover, .navbar a.active { color: var(--primary); }
.navbar a:hover::after, .navbar a.active::after { width: 100%; }

.menu-icon { font-size: 2rem; display: none; cursor: pointer; }

section { padding: 8rem 8% 4rem; min-height: 100vh; }
.section-title { text-align: center; font-size: 2.2rem; font-weight: 700; margin-bottom: 3rem; }
.section-title span { color: var(--primary); }

.btn {
    display: inline-flex; align-items: center; gap: 0.5rem;
    padding: 0.8rem 1.8rem; border-radius: 50px; font-weight: 600; cursor: pointer; transition: var(--transition);
}
.btn-primary { background-color: var(--primary); color: white; box-shadow: 0 8px 20px rgba(14, 165, 233, 0.3); }
.btn-primary:hover { background-color: var(--primary-dark); transform: translateY(-3px); }
.btn-secondary { background-color: transparent; color: var(--primary); border: 2px solid var(--primary-light); }
.btn-secondary:hover { background-color: var(--primary-light); border-color: var(--primary); transform: translateY(-3px); }
.btn-link { display: inline-flex; align-items: center; gap: 0.3rem; color: var(--primary); font-weight: 600; margin-top: 1rem; transition: var(--transition); }
.btn-link:hover { color: var(--primary-dark); gap: 0.6rem; }

.hero { display: flex; align-items: center; justify-content: space-between; gap: 4rem; }
.hero-content { flex: 1; }
.greeting { 
    color: var(--primary); 
    font-weight: 600; 
    font-size: 1.1rem; 
    margin-bottom: 0.5rem; 
    white-space: nowrap; 
    display: inline-block;
    animation: floatOnly 3s ease-in-out infinite; 
}
@keyframes floatOnly {
    0% { transform: translateY(0); }
    50% { transform: translateY(-6px); }
    100% { transform: translateY(0); }
}
.hero-content h1 { font-size: 3.5rem; font-weight: 700; line-height: 1.2; margin-bottom: 0.5rem; }
.role { font-size: 1.5rem; color: var(--text-muted); font-weight: 500; margin-bottom: 1.5rem; }
.highlight { color: var(--primary); }
.bio { color: var(--text-muted); margin-bottom: 2.5rem; font-size: 1.05rem; max-width: 90%; }
.action-btns { display: flex; gap: 1rem; margin-bottom: 2.5rem; }
.social-links { display: flex; gap: 1.2rem; }
.social-links a {
    display: flex; align-items: center; justify-content: center; width: 45px; height: 45px;
    border-radius: 50%; background-color: var(--bg-card); color: var(--text-dark);
    font-size: 1.3rem; box-shadow: var(--shadow-soft); transition: var(--transition);
}
.social-links a:hover { background-color: var(--primary); color: white; transform: translateY(-5px); }

.hero-img-container { flex: 1; display: flex; justify-content: flex-end; }
.profile-placeholder {
    width: 350px; height: 350px; border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-light), #bae6fd, var(--primary));
    box-shadow: 0 20px 50px rgba(14, 165, 233, 0.2);
    animation: float 6s ease-in-out infinite;
}
@keyframes float { 0% { transform: translateY(0px); } 50% { transform: translateY(-15px); } 100% { transform: translateY(0px); } }

.about { min-height: auto; background-color: var(--bg-card); border-radius: 30px; margin: 0 5%; padding: 5rem 5%; box-shadow: var(--shadow-soft); }
.about-content { display: flex; flex-direction: column; gap: 3rem; text-align: center; }
.about-text p { color: var(--text-muted); font-size: 1.1rem; max-width: 800px; margin: 0 auto; line-height: 1.8; }
.about-skills { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 2rem; margin-top: 2rem; }
.skill-box { padding: 2rem; background: var(--bg-main); border-radius: 20px; transition: var(--transition); border: 1px solid var(--primary-light); }
.skill-box:hover { transform: translateY(-10px); box-shadow: var(--shadow-soft); }
.skill-box i { font-size: 3rem; color: var(--primary); margin-bottom: 1rem; }
.skill-box h4 { margin-bottom: 0.5rem; font-size: 1.2rem; }
.skill-box p { color: var(--text-muted); font-size: 0.9rem; }

.card-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: 2.5rem; }
.card { background-color: var(--bg-card); border-radius: 20px; overflow: hidden; box-shadow: var(--shadow-soft); transition: var(--transition); }
.card:hover { transform: translateY(-10px); box-shadow: 0 20px 40px rgba(14, 165, 233, 0.2); }
.placeholder-img { width: 100%; height: 220px; background: linear-gradient(135deg, #e0f2fe 0%, #f0f9ff 100%); }
.card-content { padding: 1.8rem; }
.tags { display: flex; gap: 0.6rem; margin-bottom: 1rem; margin-top: 1rem; }
.tags span { background-color: var(--primary-light); color: var(--primary-dark); padding: 0.3rem 0.8rem; border-radius: 20px; font-size: 0.8rem; font-weight: 600; }

.cert-card { background-color: var(--bg-card); padding: 2rem; border-radius: 20px; box-shadow: var(--shadow-soft); transition: var(--transition); }
.cert-card:hover { transform: translateY(-5px); border-bottom: 4px solid var(--primary); }
.cert-header { display: flex; align-items: center; gap: 1rem; margin-bottom: 0.8rem; }
.cert-icon { font-size: 2.5rem; color: var(--primary); background: var(--primary-light); padding: 0.5rem; border-radius: 12px; }
.cert-issuer { color: var(--text-muted); font-size: 0.9rem; margin-bottom: 1rem; }

.contact { display: flex; justify-content: center; align-items: center; text-align: center; min-height: 70vh; }
.contact-container { background-color: var(--bg-card); padding: 4rem 3rem; border-radius: 30px; box-shadow: var(--shadow-soft); max-width: 800px; }
.contact-container h2 { font-size: 2.5rem; margin-bottom: 1rem; }
.contact-container span { color: var(--primary); }
.contact-container p { color: var(--text-muted); margin-bottom: 2.5rem; font-size: 1.1rem; }
.contact-btns { display: flex; justify-content: center; gap: 1.5rem; }

footer { text-align: center; padding: 2rem; color: var(--text-muted); font-size: 0.9rem; }

.fade-up { opacity: 0; transform: translateY(40px); transition: opacity 0.8s ease, transform 0.8s ease; }
.fade-up.visible { opacity: 1; transform: translateY(0); }
.delay { transition-delay: 0.2s; }

@media (max-width: 991px) {
    header { padding: 1.2rem 5%; }
    section { padding: 7rem 5% 4rem; }
    .hero { flex-direction: column-reverse; text-align: center; gap: 3rem; }
    .hero-content h1 { font-size: 2.8rem; }
    .bio { margin: 0 auto 2.5rem; }
    .action-btns, .social-links { justify-content: center; }
    .profile-placeholder { width: 300px; height: 300px; }
    .about { margin: 0; }
}

.cert-desc { 
    color: var(--text-muted); 
    font-size: 0.95rem; 
    margin-bottom: 1.5rem; 
    line-height: 1.6; 
}

.container {
    width: 90%;
    max-width: 1100px;
    margin: 0 auto;
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); 
    gap: 2rem;
    padding: 20px 0;
}

.contact-card {
    max-width: 700px;
    margin: 40px auto;
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(15px);
    border-radius: 30px;
    padding: 3rem 2rem;
    box-shadow: 0 25px 50px -12px rgba(14, 165, 233, 0.15);
    border: 1px solid rgba(255, 255, 255, 0.6);
    text-align: center;
}

.contact-actions {
    display: flex;
    flex-wrap: wrap; 
    justify-content: center;
    gap: 1rem;
    margin: 2rem 0;
}

.contact-actions a {
    min-width: 180px; 
    padding: 14px 24px;
    border-radius: 15px;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
    padding-left: 30px; 
}

.timeline::before {
    content: '';
    position: absolute;
    left: 10px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: #e2e8f0;
}

.timeline-item {
    position: relative;
    margin-bottom: 2.5rem;
}

.timeline-item:last-child {
    margin-bottom: 0;
}

.timeline-dot {
    position: absolute;
    left: -25px; 
    top: 5px;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: #0ea5e9;
    box-shadow: 0 0 0 4px #e0f2fe; 
    z-index: 1;
}

.timeline-content {
    background: #f8fafc;
    padding: 1.5rem;
    border-radius: 16px;
    border: 1px solid #e2e8f0;
    transition: all 0.3s ease;
}

.timeline-content:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 25px rgba(14, 165, 233, 0.1);
    border-color: #bae6fd;
    background: white;
}

.skill-grid {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 15px;
}

.skill-item {
    display: flex;
    align-items: center;
    gap: 10px;
    background: white;
    padding: 12px 24px;
    border-radius: 50px; 
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    border: 1px solid #e2e8f0;
    font-weight: 600;
    color: #475569;
    font-size: 1rem;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    cursor: default;
}

.skill-item i {
    font-size: 1.5rem; 
}

.skill-item:hover {
    transform: translateY(-5px); 
    box-shadow: 0 10px 20px rgba(14, 165, 233, 0.15); 
    border-color: #0ea5e9;
    color: #0ea5e9;
}

.modal {
    display: none; 
    position: fixed; 
    z-index: 2000; 
    padding-top: 5vh; 
    left: 0; 
    top: 0; 
    width: 100%; 
    height: 100%; 
    overflow: auto; 
    background-color: rgba(0,0,0,0.85); 
    backdrop-filter: blur(5px);
}
.info-modal-body {
    background-color: var(--bg-card);
    padding: 2rem;
    position: relative;
    width: 90%;
    max-width: 600px;
    margin: auto;
    border-radius: 12px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.5);
    animation: zoomIn 0.3s ease;
    color: var(--text-dark);
}
@keyframes zoomIn {
    from {transform: scale(0.8); opacity: 0;} 
    to {transform: scale(1); opacity: 1;}
}
.info-modal-body img {
    width: 100%;
    border-radius: 8px;
    margin-bottom: 1.5rem;
    border: 1px solid var(--primary-light);
}
.info-modal-body h4 {
    font-size: 1.4rem;
    margin-bottom: 0.5rem;
}
.info-modal-body .cert-issuer {
    color: var(--primary);
    font-weight: 600;
    margin-bottom: 1rem;
    font-size: 0.95rem;
}
.info-modal-body p {
    color: var(--text-muted);
    line-height: 1.6;
    font-size: 0.95rem;
}
.close-modal {
    position: absolute;
    top: 0px; 
    right: 12px;
    color: var(--primary); 
    font-size: 32px;
    font-weight: bold;
    cursor: pointer;
    transition: 0.3s;
    background: transparent;
    border: none;
    display: flex;
    align-items: center;
    justify-content: center;
}
.close-modal:hover { 
    color: var(--primary-dark); 
    transform: scale(1.1);
}

@media (max-width: 768px) {
    .menu-icon { display: block; }
    
    .navbar {
        position: absolute; top: 100%; left: 0; width: 100%; background-color: var(--bg-card);
        padding: 1rem 5%; flex-direction: column; gap: 1.5rem; box-shadow: 0 10px 20px rgba(0,0,0,0.05);
        clip-path: polygon(0 0, 100% 0, 100% 0, 0 0); 
        transition: var(--transition);
    }
    .navbar.active { clip-path: polygon(0 0, 100% 0, 100% 100%, 0 100%); }

    .greeting { font-size: 0.92rem !important; }

    .profile-placeholder {
        animation: none !important;
        transform: translateY(0) !important;
    }

    #projects { padding-bottom: 2rem !important; min-height: auto !important; }
    #certificates { padding-top: 3rem !important; padding-bottom: 2rem !important; min-height: auto !important; }
    #contact { padding-top: 2.5rem !important; padding-bottom: 80px !important; min-height: auto !important; height: auto !important; }

    .projects-grid { grid-template-columns: 1fr; }
    #projects .card > div:first-child { 
        height: 180px !important; 
    }
    #projects .card-content { 
        padding: 1.2rem !important; 
    }
    #projects .card-content h3 { 
        font-size: 1.2rem !important; 
    }
    #projects .card-content p { 
        font-size: 0.85rem !important; 
        margin-bottom: 1rem !important;
    }

    .experience-container {
        padding: 0 5%;
    }
    .timeline { padding-left: 40px; }
    .timeline::before { left: 10px; }
    .timeline-dot { left: -35px; }
    .timeline-content { padding: 1.2rem; box-shadow: 0 4px 15px rgba(14, 165, 233, 0.05); }

    .contact-header h2 {
        font-size: 1.8rem !important; 
        line-height: 1.3 !important;
        word-wrap: break-word !important; 
        padding: 0 10px !important;
    }
    .contact-card { padding-bottom: 40px !important; padding: 2rem 1.5rem; margin: 20px; }
    .contact-socials a { font-size: 2rem !important; }
    .contact-actions a { width: 100%; }
    .contact-btns { flex-direction: column; gap: 1rem; }
    
    #certificates .card-grid {
        display: grid !important;
        grid-template-columns: repeat(2, 1fr) !important; 
        gap: 1rem !important; 
    }
    #certificates .cert-card {
        padding: 1rem !important; 
        display: flex;
        flex-direction: column;
        align-items: center;
        text-align: center;
    }
    #certificates .cert-info {
        display: none;
    }
    #certificates .cert-card img {
        margin-bottom: 0.8rem !important;
    }
    #certificates .btn-link {
        font-size: 0.75rem; 
        margin-top: auto; 
        gap: 0.2rem;
    }
}