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

:root {
    --primary-color: #003366;
    --secondary-color: #004080;
    --light-blue: #003366;
    --accent-color: #FFD700;
    --accent-dark: #FFC107;
    --text-dark: #212121;
    --text-light: #616161;
    --bg-light: #003366;
    --bg-white: #f8f9fa;
    --border-color: #004080;
    --shadow: 0 2px 10px rgba(0, 51, 102, 0.2);
    --shadow-lg: 0 5px 30px rgba(0, 51, 102, 0.25);
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow);
    z-index: 1000;
    transition: all 0.3s ease;
}

.nav-wrapper {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    letter-spacing: -0.5px;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
    align-items: center;
}

.nav-menu > li {
    position: relative;
}

.nav-menu a {
    text-decoration: none;
    color: var(--text-dark);
    font-weight: 500;
    transition: color 0.3s ease;
    position: relative;
}

.nav-menu a:hover {
    color: var(--primary-color);
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent-color);
    transition: width 0.3s ease;
}

.nav-menu a:hover::after {
    width: 100%;
}


.nav-toggle {
    display: none;
    flex-direction: column;
    background: none;
    border: none;
    cursor: pointer;
    gap: 5px;
}

.nav-toggle span {
    width: 25px;
    height: 3px;
    background: var(--primary-color);
    transition: all 0.3s ease;
    transform-origin: center;
    display: block;
}

/* Hero Section */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #004080 0%, #003366 100%);
    color: white;
    text-align: center;
    padding-top: 80px;
    overflow: hidden;
}

.hero-video {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    z-index: 0;
    opacity: 0;
    transition: opacity 0.8s ease-in-out;
    background: linear-gradient(135deg, #004080 0%, #003366 100%);
}

.hero-video.loaded {
    opacity: 1;
}

/* Video yüklenene kadar arka plan rengi göster */
.hero-video:not(.loaded) {
    background: linear-gradient(135deg, #004080 0%, #003366 100%);
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg width="100" height="100" xmlns="http://www.w3.org/2000/svg"><defs><pattern id="grid" width="100" height="100" patternUnits="userSpaceOnUse"><path d="M 100 0 L 0 0 0 100" fill="none" stroke="rgba(255,255,255,0.1)" stroke-width="1"/></pattern></defs><rect width="100" height="100" fill="url(%23grid)"/></svg>');
    opacity: 0.3;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.4);
    z-index: 1;
}

.hero-content {
    position: relative;
    z-index: 2;
    max-width: 800px;
    padding: 2rem;
    padding-bottom: 4rem;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    line-height: 1.2;
    letter-spacing: -1px;
}

.hero-subtitle {
    font-size: 1.25rem;
    margin-bottom: 2.5rem;
    opacity: 0.95;
    line-height: 1.6;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

.btn {
    padding: 1rem 2rem;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    display: inline-block;
    border: 2px solid transparent;
}

.btn-primary {
    background: var(--accent-color);
    color: var(--primary-color);
    font-weight: 700;
}

.btn-primary:hover {
    background: var(--accent-dark);
    color: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background: transparent;
    color: white;
    border: 2px solid white;
}

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

.btn-outline {
    background: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

.btn-outline:hover {
    background: var(--primary-color);
    color: white;
}

.certifications-badge {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 2rem;
    flex-wrap: wrap;
    justify-content: center;
    z-index: 2;
}

.cert-item {
    background: rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(10px);
    padding: 0.5rem 1rem;
    border-radius: 25px;
    font-size: 0.85rem;
    font-weight: 500;
    border: 1px solid rgba(255, 255, 255, 0.3);
}

/* Intro Section */
.intro-section {
    padding: 5rem 0;
    background: var(--bg-white);
    color: var(--text-dark);
}

.intro-content {
    text-align: center;
    max-width: 900px;
    margin: 0 auto;
}

.intro-content h2 {
    font-size: 2.5rem;
    margin-bottom: 1.5rem;
    color: var(--primary-color);
}

.intro-content > p {
    font-size: 1.1rem;
    color: var(--text-light);
    margin-bottom: 3rem;
    line-height: 1.8;
}

.stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.stat-item {
    text-align: center;
}

.stat-number {
    font-size: 3rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.stat-label {
    font-size: 1rem;
    color: var(--text-light);
    font-weight: 500;
}

/* Section Header */
.section-header {
    text-align: center;
    max-width: 800px;
    margin: 0 auto 4rem;
}

.section-header h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.projects-section .section-header h2,
.about-section .section-header h2 {
    color: white;
}

.section-header p {
    font-size: 1.1rem;
    color: var(--text-light);
    line-height: 1.8;
}

.projects-section .section-header p,
.about-section .section-header p {
    color: rgba(255, 255, 255, 0.9);
}

/* Expertise Section */
.expertise-section {
    padding: 5rem 0;
    background: var(--bg-white);
    position: relative;
}

/* Divider between intro and expertise (both white) */
.intro-section + .expertise-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 400px;
    height: 4px;
    background: linear-gradient(90deg, transparent, var(--light-blue), transparent);
    border-radius: 2px;
    z-index: 1;
    box-shadow: 0 2px 8px rgba(0, 51, 102, 0.3);
}

.expertise-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
}

.expertise-card {
    background: var(--bg-white);
    padding: 2.5rem;
    border-radius: 15px;
    box-shadow: var(--shadow);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    border: 2px solid transparent;
    position: relative;
    overflow: hidden;
}

.expertise-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(0, 51, 102, 0.05), transparent);
    transition: left 0.5s ease;
}

.expertise-card:hover::before {
    left: 100%;
}

.expertise-card:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: var(--shadow-lg);
    border-color: var(--border-color);
}

.expertise-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--primary-color);
    position: relative;
    transition: color 0.3s ease;
}

.expertise-card:hover h3 {
    color: var(--secondary-color);
}

.expertise-card > p {
    color: var(--text-light);
    margin-bottom: 1.5rem;
    line-height: 1.7;
}

.expertise-list {
    list-style: none;
    margin-bottom: 1.5rem;
}

.expertise-list li {
    padding: 0.5rem 0;
    color: var(--text-light);
    position: relative;
    padding-left: 1.5rem;
}

.expertise-list li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--accent-color);
    font-weight: bold;
}

.expertise-link {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
}

.expertise-link:hover {
    color: var(--accent-color);
    margin-left: 5px;
}

/* About Section */
.about-section {
    padding: 5rem 0;
    background: var(--light-blue);
    color: white;
}

.about-text {
    max-width: 900px;
    margin: 0 auto;
}

.about-text h2 {
    font-size: 2.5rem;
    margin-bottom: 1.5rem;
    color: white;
}

.about-text > p {
    font-size: 1.1rem;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 1.5rem;
    line-height: 1.8;
}

.values-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.value-item {
    padding: 1.5rem;
    background: var(--bg-white);
    border-radius: 10px;
    border: 1px solid var(--border-color);
}

.value-item h4 {
    font-size: 1.25rem;
    margin-bottom: 0.75rem;
    color: var(--primary-color);
}

.value-item p {
    color: var(--text-light);
    line-height: 1.7;
}

/* Certifications Section */
.certifications-section {
    padding: 5rem 0;
    background: var(--bg-white);
}

.certifications-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.cert-card {
    background: var(--bg-white);
    padding: 2rem;
    border-radius: 15px;
    text-align: center;
    box-shadow: var(--shadow);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    border: 2px solid transparent;
    position: relative;
}

.cert-card::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 193, 7, 0.1);
    transform: translate(-50%, -50%);
    transition: width 0.4s ease, height 0.4s ease;
}

.cert-card:hover::before {
    width: 100%;
    height: 100%;
}

.cert-card:hover {
    transform: translateY(-8px) scale(1.05);
    box-shadow: var(--shadow-lg);
    border-color: var(--accent-color);
}

.cert-name {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 0.75rem;
}

.cert-card p {
    color: var(--text-light);
    font-size: 0.95rem;
}

/* Projects Section */
.projects-section {
    padding: 5rem 0;
    background: var(--light-blue);
    color: white;
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.project-card {
    background: var(--bg-white);
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    padding: 2rem;
    border-radius: 15px;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    border: 2px solid var(--border-color);
    position: relative;
    overflow: hidden;
    min-height: 300px;
    display: flex;
    align-items: flex-end;
}

.project-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(to top, rgba(0, 51, 102, 0.9) 0%, rgba(0, 51, 102, 0.7) 50%, rgba(0, 51, 102, 0.5) 100%);
    transition: all 0.4s ease;
    z-index: 1;
}

.project-card:hover .project-overlay {
    background: linear-gradient(to top, rgba(0, 51, 102, 0.95) 0%, rgba(0, 51, 102, 0.8) 50%, rgba(0, 51, 102, 0.6) 100%);
}

.project-content {
    position: relative;
    z-index: 2;
    width: 100%;
}

.project-card::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 4px;
    background: var(--accent-color);
    transition: width 0.4s ease;
}

.project-card:hover::after {
    width: 100%;
}

.project-card:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: var(--shadow-lg);
    border-color: var(--accent-color);
}

.project-card:hover .project-overlay {
    background: linear-gradient(to top, rgba(0, 51, 102, 0.98) 0%, rgba(0, 51, 102, 0.85) 50%, rgba(0, 51, 102, 0.7) 100%);
}

.project-category {
    font-size: 0.85rem;
    color: var(--accent-color);
    font-weight: 600;
    margin-bottom: 1rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.project-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: white;
}

.project-card p {
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 1.5rem;
    line-height: 1.7;
}

.project-link {
    color: var(--accent-color);
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
}

.project-link:hover {
    color: white;
    margin-left: 5px;
}

/* Contact Section */
.contact-section {
    padding: 5rem 0;
    background: var(--light-blue);
    color: white;
    position: relative;
}

/* Divider between projects and contact (both blue) */
.projects-section + .contact-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 400px;
    height: 4px;
    background: linear-gradient(90deg, transparent, var(--bg-white), transparent);
    border-radius: 2px;
    z-index: 1;
    box-shadow: 0 2px 8px rgba(255, 255, 255, 0.3);
}

.contact-content {
    max-width: 900px;
    margin: 0 auto;
    text-align: center;
}

.contact-text h2 {
    font-size: 2.5rem;
    margin-bottom: 1.5rem;
}

.contact-text p {
    font-size: 1.1rem;
    margin-bottom: 3rem;
    opacity: 0.95;
    line-height: 1.8;
}

.contact-info {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.contact-item {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    padding: 2rem;
    border-radius: 15px;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.contact-item h4 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
}

.contact-item a {
    color: white;
    text-decoration: none;
    font-size: 1.1rem;
    transition: all 0.3s ease;
}

.contact-item a:hover:not(.btn-outline) {
    color: var(--accent-color);
}

.contact-item .btn-outline {
    background: transparent;
    color: white;
    border: 2px solid white;
}

.contact-item .btn-outline:hover {
    background: var(--accent-color);
    color: var(--primary-color) !important;
    border-color: var(--accent-color);
}

.contact-item p {
    margin-bottom: 1rem;
    opacity: 0.9;
}

/* Footer */
.footer {
    background: var(--primary-color);
    color: white;
    padding: 3rem 0 1.5rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section h4 {
    font-size: 1.1rem;
    margin-bottom: 1rem;
    color: white;
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: 0.5rem;
}

.footer-section a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-section a:hover {
    color: white;
}

.footer-section p {
    color: rgba(255, 255, 255, 0.8);
    line-height: 1.7;
}

/* Social Media Icons */
.social-media {
    display: flex;
    gap: 1rem;
    margin-top: 1.5rem;
}

.social-icon {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    color: rgba(255, 255, 255, 0.8);
    transition: all 0.3s ease;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.social-icon:hover {
    background: var(--accent-color);
    color: var(--primary-color);
    transform: translateY(-3px);
    box-shadow: 0 4px 15px rgba(255, 193, 7, 0.3);
    border-color: var(--accent-color);
}

.social-icon svg {
    width: 20px;
    height: 20px;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.footer-links {
    display: flex;
    gap: 1.5rem;
    flex-wrap: wrap;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    font-size: 0.9rem;
    transition: color 0.3s ease;
}

.footer-links a:hover {
    color: white;
}

/* Footer Credit */
.footer-credit {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 1rem;
    margin-top: 1rem;
    text-align: center;
}

.footer-credit p {
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.85rem;
    margin: 0;
}

.footer-credit .credit-name {
    color: var(--accent-color);
    font-weight: 600;
    text-decoration: none;
    transition: all 0.3s ease;
}

.footer-credit .credit-name:hover {
    color: white;
    text-decoration: underline;
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background: var(--bg-white);
        width: 100%;
        text-align: center;
        transition: 0.3s;
        box-shadow: var(--shadow);
        padding: 2rem 0;
    }

    .nav-menu.active {
        left: 0;
    }

    .nav-menu > li {
        width: 100%;
        padding: 0;
        text-align: center;
    }
    
    .nav-menu > li > a {
        display: flex;
        align-items: center;
        justify-content: center;
        width: 100%;
        padding: 0.75rem 1rem;
        text-align: center;
    }

    .dropdown-arrow {
        display: inline-block;
    }

    .nav-toggle {
        display: flex;
    }

    .hero-title {
        font-size: 2.5rem;
    }

    .hero-subtitle {
        font-size: 1.1rem;
    }

    .section-header h2,
    .intro-content h2,
    .about-text h2 {
        font-size: 2rem;
    }

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

    .certifications-badge {
        flex-direction: column;
        gap: 0.5rem;
        bottom: 20px;
        padding: 0 20px;
    }

    .hero-content {
        padding-bottom: 150px;
    }
    
    .hero {
        min-height: 100vh;
        padding-bottom: 100px;
    }

    .hero-video {
        object-fit: cover;
    }

    .project-card {
        min-height: 250px;
    }

    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
    }

    .hero-buttons {
        flex-direction: column;
    }

    .hero-content {
        padding-bottom: 160px;
    }
    
    .hero {
        padding-bottom: 120px;
    }

    .certifications-badge {
        bottom: 15px;
        gap: 0.4rem;
    }

    .btn {
        width: 100%;
        text-align: center;
    }
}