:root {
    --primary-blue: #4682B4;
    --medium-blue: #4682B4;
    --light-blue: #ADD8E6;
    --pale-blue: #F0F8FF;
    --dark-blue: #2E5D8A;
    --accent-blue: #1E4D7A;
    --text-dark: #333;
    --text-light: #555;
    --white: #ffffff;
    --shadow: rgba(0, 0, 0, 0.1);
    --shadow-hover: rgba(0, 0, 0, 0.2);
}

[data-theme="dark"] {
    --primary-blue: #5A9FD4;
    --medium-blue: #3A7BD5;
    --light-blue: #1a1a2e;
    --pale-blue: #16213e;
    --dark-blue: #0f1419;
    --accent-blue: #4A90E2;
    --text-dark: #e4e6ea;
    --text-light: #b0b3b8;
    --white: #1a1a2e;
    --shadow: rgba(255, 255, 255, 0.1);
    --shadow-hover: rgba(255, 255, 255, 0.2);
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--light-blue);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    color: var(--text-dark);
    transition: background-color 0.3s, color 0.3s;
}

/* Accessibility improvements */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.skip-link {
    position: absolute;
    top: -40px;
    left: 6px;
    background: var(--primary-blue);
    color: white;
    padding: 8px;
    text-decoration: none;
    z-index: 1000;
}

.skip-link:focus {
    top: 6px;
}

header {
    background-color: var(--medium-blue);
    color: white;
    padding: 20px;
    text-align: center;
    position: relative;
    transition: background-color 0.3s;
}

.header-title {
    font-size: 2.5em;
    font-weight: bold;
    margin-bottom: 10px;
}

.header-subtitle {
    font-size: 1.3em;
    font-weight: 300;
}

.header-controls {
    position: absolute;
    top: 20px;
    right: 20px;
    display: flex;
    gap: 15px;
    align-items: center;
}

.theme-toggle {
    background: var(--accent-blue);
    border: none;
    color: white;
    padding: 8px 12px;
    border-radius: 5px;
    cursor: pointer;
    font-size: 18px;
    transition: background-color 0.3s;
}

.theme-toggle:hover {
    background: var(--dark-blue);
}

.search-container {
    position: relative;
}

.search-input {
    padding: 8px 35px 8px 12px;
    border: none;
    border-radius: 5px;
    font-size: 14px;
    width: 200px;
    transition: width 0.3s;
}

.search-input:focus {
    outline: 2px solid var(--accent-blue);
    width: 250px;
}

.search-btn {
    position: absolute;
    right: 5px;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: var(--text-light);
    cursor: pointer;
    padding: 5px;
}

.nav-dropdown {
    display: none;
}

.nav-menu {
    display: flex;
    gap: 20px;
    justify-content: center;
    margin-top: 20px;
}

.nav-menu a {
    color: white;
    text-decoration: none;
    padding: 10px 15px;
    border-radius: 5px;
    transition: background-color 0.3s;
}

.nav-menu a:hover,
.nav-menu a.active {
    background-color: var(--accent-blue);
}

/* Mobile hamburger menu */
.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    padding: 5px;
}

.hamburger span {
    width: 25px;
    height: 3px;
    background: white;
    margin: 3px 0;
    transition: 0.3s;
}

main {
    flex: 1;
    padding: 40px 20px;
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
}

/* Hero Section */
.hero {
    text-align: center;
    padding: 60px 0;
    background: linear-gradient(135deg, var(--pale-blue) 0%, var(--light-blue) 100%);
    border-radius: 15px;
    margin-bottom: 60px;
    box-shadow: 0 8px 25px var(--shadow);
}

.hero h1 {
    font-size: 3.5em;
    color: var(--primary-blue);
    margin-bottom: 20px;
    font-weight: 700;
}

.hero p {
    font-size: 1.3em;
    color: var(--text-light);
    margin-bottom: 30px;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
    line-height: 1.6;
}

.hero-cta {
    display: flex;
    gap: 20px;
    justify-content: center;
    flex-wrap: wrap;
}

.cta-primary, .cta-secondary {
    padding: 15px 30px;
    font-size: 18px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s;
    display: inline-block;
}

.cta-primary {
    background: var(--primary-blue);
    color: white;
    border: 2px solid var(--primary-blue);
}

.cta-primary:hover {
    background: var(--dark-blue);
    border-color: var(--dark-blue);
    transform: translateY(-2px);
}

.cta-secondary {
    background: transparent;
    color: var(--primary-blue);
    border: 2px solid var(--primary-blue);
}

.cta-secondary:hover {
    background: var(--primary-blue);
    color: white;
    transform: translateY(-2px);
}

/* Skills badges */
.skills-section {
    margin: 60px 0;
    text-align: center;
}

.skills-section h2 {
    font-size: 2.5em;
    color: var(--primary-blue);
    margin-bottom: 40px;
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 20px;
    max-width: 800px;
    margin: 0 auto;
}

.skill-badge {
    background: var(--pale-blue);
    padding: 20px 10px;
    border-radius: 10px;
    text-align: center;
    transition: transform 0.3s, box-shadow 0.3s;
    border: 2px solid transparent;
}

.skill-badge:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px var(--shadow-hover);
    border-color: var(--primary-blue);
}

.skill-badge .skill-icon {
    font-size: 2.5em;
    margin-bottom: 10px;
    color: var(--primary-blue);
}

.skill-badge .skill-name {
    font-weight: 600;
    color: var(--text-dark);
}

.page-title {
    text-align: center;
    font-size: 2.5em;
    color: var(--primary-blue);
    margin-bottom: 40px;
}

.cards-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-bottom: 40px;
}

.card {
    background-color: var(--pale-blue);
    border-radius: 10px;
    padding: 30px;
    box-shadow: 0 4px 6px var(--shadow);
    transition: transform 0.3s, box-shadow 0.3s;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 15px var(--shadow-hover);
}

.card h3 {
    color: var(--primary-blue);
    font-size: 1.5em;
    margin-bottom: 15px;
}

.card p {
    color: var(--text-light);
    line-height: 1.6;
    margin-bottom: 20px;
}

.card-btn {
    background-color: var(--primary-blue);
    color: white;
    padding: 12px 24px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 16px;
    transition: background-color 0.3s;
    text-decoration: none;
    display: inline-block;
}

.card-btn:hover {
    background-color: var(--dark-blue);
}

.content-section {
    background-color: var(--pale-blue);
    border-radius: 10px;
    padding: 30px;
    margin-bottom: 30px;
    box-shadow: 0 4px 6px var(--shadow);
}

.content-section h2 {
    color: var(--primary-blue);
    font-size: 1.8em;
    margin-bottom: 20px;
}

.content-section h3 {
    color: var(--medium-blue);
    font-size: 1.3em;
    margin-bottom: 15px;
    margin-top: 25px;
}

.content-section p {
    color: var(--text-light);
    line-height: 1.6;
    margin-bottom: 15px;
}

.content-section ul {
    color: var(--text-light);
    line-height: 1.6;
    margin-left: 20px;
    margin-bottom: 15px;
}

/* Contact Form */
.contact-form {
    background: var(--pale-blue);
    padding: 40px;
    border-radius: 15px;
    box-shadow: 0 8px 25px var(--shadow);
    max-width: 600px;
    margin: 0 auto;
}

.form-group {
    margin-bottom: 25px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    color: var(--text-dark);
    font-weight: 600;
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 12px 15px;
    border: 2px solid #ddd;
    border-radius: 8px;
    font-size: 16px;
    transition: border-color 0.3s;
    background: var(--white);
    color: var(--text-dark);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-blue);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

.form-submit {
    background: var(--primary-blue);
    color: white;
    padding: 15px 40px;
    border: none;
    border-radius: 8px;
    font-size: 18px;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.3s, transform 0.3s;
}

.form-submit:hover {
    background: var(--dark-blue);
    transform: translateY(-2px);
}

/* Certifications */
.cert-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-top: 20px;
}

.cert-badge {
    background: var(--pale-blue);
    padding: 20px;
    border-radius: 10px;
    text-align: center;
    border: 2px solid var(--primary-blue);
    transition: transform 0.3s;
}

.cert-badge:hover {
    transform: scale(1.05);
}

.cert-badge .cert-icon {
    font-size: 2em;
    color: var(--primary-blue);
    margin-bottom: 10px;
}

.cert-badge h4 {
    color: var(--text-dark);
    margin-bottom: 8px;
}

.cert-badge p {
    color: var(--text-light);
    font-size: 0.9em;
}

/* Blog/Articles */
.blog-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.blog-card {
    background: var(--pale-blue);
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 4px 6px var(--shadow);
    transition: transform 0.3s;
}

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

.blog-card-header {
    padding: 20px;
    background: var(--primary-blue);
    color: white;
}

.blog-card-header h3 {
    margin-bottom: 10px;
}

.blog-card-header .blog-date {
    font-size: 0.9em;
    opacity: 0.9;
}

.blog-card-content {
    padding: 20px;
}

.blog-card-content p {
    color: var(--text-light);
    line-height: 1.6;
    margin-bottom: 15px;
}

.blog-read-more {
    color: var(--primary-blue);
    text-decoration: none;
    font-weight: 600;
}

.blog-read-more:hover {
    text-decoration: underline;
}

/* Recommendations */
.recommendation {
    background: var(--pale-blue);
    border-radius: 10px;
    padding: 25px;
    margin-bottom: 20px;
    box-shadow: 0 4px 6px var(--shadow);
    border-left: 5px solid var(--primary-blue);
}

.recommendation-header {
    display: flex;
    align-items: center;
    margin-bottom: 15px;
}

.recommendation-avatar {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: var(--primary-blue);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: bold;
    margin-right: 15px;
}

.recommendation-info h4 {
    color: var(--text-dark);
    margin-bottom: 5px;
}

.recommendation-info p {
    color: var(--text-light);
    font-size: 0.9em;
}

.recommendation-content {
    color: var(--text-light);
    line-height: 1.6;
    font-style: italic;
}

.download-resume {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    background: var(--primary-blue);
    color: white;
    padding: 12px 24px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    transition: background-color 0.3s, transform 0.3s;
    margin: 20px 0;
}

.download-resume:hover {
    background: var(--dark-blue);
    transform: translateY(-2px);
}

.service-dropdown {
    margin: 20px 0;
}

.service-dropdown select {
    padding: 10px;
    font-size: 16px;
    border-radius: 5px;
    border: 1px solid #ccc;
    background-color: white;
    min-width: 250px;
}

footer {
    background-color: var(--medium-blue);
    color: white;
    text-align: center;
    padding: 20px;
    margin-top: auto;
    transition: background-color 0.3s;
}

footer a {
    color: var(--light-blue);
    text-decoration: none;
}

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

.hidden {
    display: none;
}

/* Search Results */
.search-results {
    background: var(--pale-blue);
    border-radius: 10px;
    padding: 20px;
    margin: 20px 0;
    box-shadow: 0 4px 6px var(--shadow);
}

.search-results h3 {
    color: var(--primary-blue);
    margin-bottom: 15px;
}

.search-result-item {
    padding: 10px 0;
    border-bottom: 1px solid #eee;
}

.search-result-item:last-child {
    border-bottom: none;
}

.search-result-item h4 {
    color: var(--text-dark);
    margin-bottom: 5px;
}

.search-result-item p {
    color: var(--text-light);
    font-size: 0.9em;
}

/* Mobile Responsive */
@media (max-width: 768px) {
    .header-title {
        font-size: 2em;
    }

    .header-subtitle {
        font-size: 1.1em;
    }

    .header-controls {
        position: static;
        margin-top: 20px;
        justify-content: center;
    }

    .search-input {
        width: 150px;
    }

    .search-input:focus {
        width: 200px;
    }

    .nav-menu {
        display: none;
    }

    .nav-dropdown {
        display: block;
    }

    .hamburger {
        display: flex;
    }

    .dropdown-content {
        display: none;
        position: absolute;
        right: 0;
        background-color: var(--pale-blue);
        min-width: 200px;
        box-shadow: 0px 8px 16px 0px var(--shadow-hover);
        z-index: 1;
        border-radius: 5px;        
        top: 100%;
    }

    .dropdown-content a {
        color: var(--text-dark);
        padding: 12px 16px;
        text-decoration: none;
        display: block;
        transition: background-color 0.3s;
    }

    .dropdown-content a:hover {
        background-color: var(--light-blue);
    }

    .dropdown.active .dropdown-content {
        display: block;
    }

    .hero h1 {
        font-size: 2.5em;
    }

    .hero p {
        font-size: 1.1em;
    }

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

    .page-title {
        font-size: 2em;
    }

    .cards-container {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    main {
        padding: 20px 15px;
    }

    .skills-grid {
        grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
        gap: 15px;
    }

    .contact-form {
        padding: 30px 20px;
    }
}