/* Global Styles & Reset */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    background: #f5f7fa;
    color: #333;
}

/* Header & Navigation */
header {
    background: #ffffff;
    padding: 1.5rem 5%;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.08);
}

.header-content {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.logo h1 {
    font-size: 1.5rem;
    color: #2c5aa0;
}

.logo p {
    color: #6c757d;
    font-size: 0.9rem;
    margin: 0;
}

nav {
    display: flex;
    gap: 2rem;
    flex-wrap: wrap;
}

nav a {
    color: #495057;
    font-weight: 600;
    text-decoration: none;
    transition: color 0.3s ease;
    position: relative;
    padding: 0.5rem 0;
}

nav a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: #2c5aa0;
    transition: width 0.3s ease;
}

nav a:hover,
nav a.active {
    color: #2c5aa0;
}

nav a:hover::after,
nav a.active::after {
    width: 100%;
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 5%;
}

/* Sections */
section {
    background: white;
    margin: 2rem 0;
    padding: 3rem 5%;
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
}

section h2 {
    font-size: 2rem;
    margin-bottom: 1.5rem;
    color: #2c5aa0;
    position: relative;
    padding-bottom: 0.5rem;
}

section h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 60px;
    height: 4px;
    background: #2c5aa0;
    border-radius: 2px;
}

/* Profile Section */
#profile {
    text-align: center;
    background: linear-gradient(135deg, #2c5aa0 0%, #1e3a6f 100%);
    color: white;
    padding: 4rem 5%;
    margin: 0;
    border-radius: 0;
}

#profile h1 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
}

#profile .title {
    font-size: 1.3rem;
    margin-bottom: 1rem;
    opacity: 0.9;
}

#profile .contact-links {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    margin-top: 1.5rem;
    flex-wrap: wrap;
}

#profile .contact-links a {
    color: white;
    text-decoration: none;
    padding: 0.7rem 1.5rem;
    border: 2px solid white;
    border-radius: 5px;
    transition: all 0.3s ease;
    font-weight: 600;
}

#profile .contact-links a:hover {
    background: white;
    color: #2c5aa0;
}

/* Skills */
.skill-category {
    margin-bottom: 2rem;
}

.skill-category h3 {
    color: #495057;
    margin-bottom: 1rem;
    font-size: 1.2rem;
}

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.skill-tag {
    background: #2c5aa0;
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 500;
    transition: transform 0.3s ease;
}

.skill-tag:hover {
    transform: scale(1.05);
}

/* Projects */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.project-card {
    background: #f8f9fa;
    padding: 2rem;
    border-radius: 12px;
    border-left: 4px solid #2c5aa0;
    transition: all 0.3s ease;
    position: relative;
}

.project-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(44, 90, 160, 0.15);
}

.project-number {
    position: absolute;
    top: 1rem;
    right: 1rem;
    font-size: 3rem;
    font-weight: 700;
    color: rgba(44, 90, 160, 0.1);
}

.project-card h3 {
    color: #2c5aa0;
    margin-bottom: 1rem;
    font-size: 1.3rem;
}

.project-card p {
    color: #555;
    margin-bottom: 1rem;
}

.tech-stack {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin: 1rem 0;
}

.tech-tag {
    background: #e9ecef;
    color: #495057;
    padding: 0.3rem 0.8rem;
    border-radius: 15px;
    font-size: 0.85rem;
}

.project-links {
    margin-top: 1.5rem;
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.project-links a {
    color: #2c5aa0;
    font-weight: 600;
    text-decoration: none;
}

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

/* Accomplishments */
.accomplishments-list {
    list-style: none;
}

.accomplishments-list li {
    padding: 1rem 0 1rem 2.5rem;
    position: relative;
    color: #555;
    border-bottom: 1px solid #e9ecef;
}

.accomplishments-list li:last-child {
    border-bottom: none;
}

.accomplishments-list li::before {
    content: '★';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 30px;
    height: 30px;
    background: #2c5aa0;
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
}

/* Certifications */
.cert-grid {
    display: grid;
    gap: 1.5rem;
}

.cert-item {
    background: #f8f9fa;
    padding: 1.5rem;
    border-radius: 8px;
    border-left: 4px solid #2c5aa0;
    transition: all 0.3s ease;
}

.cert-item:hover {
    transform: translateX(10px);
    box-shadow: 0 4px 15px rgba(44, 90, 160, 0.1);
}

.cert-item h3 {
    color: #2c5aa0;
    margin-bottom: 0.5rem;
    font-size: 1.1rem;
}

.cert-item p {
    color: #6c757d;
    margin-bottom: 0.5rem;
}

.cert-item a {
    color: #2c5aa0;
    text-decoration: none;
    font-weight: 600;
}

.cert-item a:hover {
    text-decoration: underline;
}

/* Activities */
.activities-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
}

.activity-card {
    background: #f8f9fa;
    padding: 1.5rem;
    border-radius: 8px;
    border-top: 3px solid #2c5aa0;
    transition: all 0.3s ease;
}

.activity-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

.activity-card h3 {
    color: #2c5aa0;
    margin-bottom: 0.5rem;
}

.activity-card p {
    color: #555;
    margin: 0;
}

/* Contact Section */
#contact {
    background: linear-gradient(135deg, #2c5aa0 0%, #1e3a6f 100%);
    color: white;
    text-align: center;
}

#contact h2 {
    color: white;
}

#contact h2::after {
    background: white;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-top: 2rem;
}

.contact-info p {
    font-size: 1.1rem;
}

.contact-info a {
    color: white;
    font-weight: 600;
    text-decoration: none;
    border-bottom: 2px solid transparent;
    transition: border-color 0.3s ease;
}

.contact-info a:hover {
    border-bottom-color: white;
}

/* Footer */
footer {
    background: #ffffff;
    color: #495057;
    text-align: center;
    padding: 2rem 5%;
    box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.08);
}

footer p {
    margin: 0.5rem 0;
}

footer a {
    color: #2c5aa0;
    margin: 0 0.5rem;
    text-decoration: none;
    font-weight: 600;
}

footer a:hover {
    text-decoration: underline;
}

/* Back to Top Button */
#backToTop {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: #2c5aa0;
    color: white;
    border: none;
    border-radius: 50%;
    font-size: 1.5rem;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    z-index: 9999;
    box-shadow: 0 4px 15px rgba(44, 90, 160, 0.3);
}

#backToTop.show {
    opacity: 1;
    visibility: visible;
}

#backToTop:hover {
    background: #1e3a6f;
    transform: scale(1.1);
}

/* Certificate Modal */
.cert-modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.9);
    z-index: 10000;
    justify-content: center;
    align-items: center;
}

.cert-modal.show {
    display: flex;
}

.cert-modal-content {
    position: relative;
    max-width: 90%;
    max-height: 90%;
}

.cert-modal-content img {
    width: 100%;
    height: auto;
    border-radius: 8px;
    box-shadow: 0 10px 50px rgba(0, 0, 0, 0.5);
}

.cert-modal-close {
    position: absolute;
    top: -40px;
    right: 0;
    color: white;
    font-size: 2.5rem;
    font-weight: bold;
    cursor: pointer;
    background: none;
    border: none;
    padding: 0;
    line-height: 1;
}

.cert-modal-close:hover {
    color: #2c5aa0;
}

/* Responsive Design */
@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        text-align: center;
    }

    nav {
        gap: 1rem;
        justify-content: center;
    }

    #profile h1 {
        font-size: 2rem;
    }

    section {
        padding: 2rem 1.5rem;
    }

    section h2 {
        font-size: 1.6rem;
    }

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