:root {
    --primary-color: #007bff;
    --secondary-color: #6c757d;
    --accent-color: #28a745;
    --dark-bg: #212529;
    --light-bg: #f8f9fa;
    --text-color: #343a40;
    --light-text-color: #ffffff;
    --border-color: #e9ecef;
    --shadow-light: 0 4px 15px rgba(0, 0, 0, 0.08);
    --shadow-medium: 0 8px 25px rgba(0, 0, 0, 0.1);
}

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

body {
    font-family: 'Poppins', sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--light-bg);
    overflow-x: hidden;
}

a {
    text-decoration: none;
    color: var(--primary-color);
    transition: color 0.3s ease;
}

a:hover {
    color: var(--accent-color);
}

ul {
    list-style: none;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 20px;
}

.btn {
    display: inline-block;
    padding: 12px 28px;
    border-radius: 50px;
    font-weight: 600;
    transition: all 0.3s ease;
    text-align: center;
}

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

.primary-btn:hover {
    background-color: var(--accent-color);
    border-color: var(--accent-color);
    transform: translateY(-3px);
    box-shadow: var(--shadow-light);
}

.section-card {
    padding: 80px 0;
    margin-bottom: 0;
    text-align: center;
}

.section-card h2 {
    font-size: 3em;
    margin-bottom: 50px;
    position: relative;
    display: inline-block;
    color: var(--dark-bg);
}

.section-card h2::after {
    content: '';
    position: absolute;
    left: 50%;
    bottom: -10px;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background-color: var(--primary-color);
    border-radius: 2px;
}

.bg-light {
    background-color: var(--light-bg);
}

/* Navbar */
.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background-color: var(--dark-bg);
    padding: 15px 30px;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: var(--shadow-light);
}

.navbar .logo a {
    color: var(--light-text-color);
    font-size: 1.8em;
    font-weight: 700;
    transition: color 0.3s ease;
}

.navbar .logo a:hover {
    color: var(--primary-color);
}

.nav-links {
    display: flex;
}

.nav-links li {
    margin-left: 30px;
}

.nav-links a {
    color: var(--light-text-color);
    font-weight: 500;
    position: relative;
    padding-bottom: 5px;
}

.nav-links a::after {
    content: '';
    position: absolute;
    width: 0%;
    height: 2px;
    background-color: var(--primary-color);
    left: 0;
    bottom: 0;
    transition: width 0.3s ease-in-out;
}

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

.burger {
    display: none;
    cursor: pointer;
    flex-direction: column;
    justify-content: space-around;
    width: 30px;
    height: 25px;
    z-index: 1001;
}

.burger div {
    width: 100%;
    height: 3px;
    background-color: var(--light-text-color);
    border-radius: 5px;
    transition: all 0.3s ease;
}

/* Hero Section */
.hero {
    position: relative;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    text-align: center;
    color: var(--light-text-color);
    background: linear-gradient(rgba(0, 0, 0, 0.7), rgba(0, 0, 0, 0.7)), url("https://images.unsplash.com/photo-1515879252706-07cdc1a32f0e?q=80&w=2070&auto=format&fit=crop&ixlib=rb-4.0.3&ixid=M3wxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8fA%3D%3D") no-repeat center center/cover;
    background-attachment: fixed;

}

.hero-content {
    animation: fadeIn 1.5s ease-out;
}

.hero-profile-img {
    width: 180px;
    height: 180px;
    border-radius: 50%;
    object-fit: cover;
    border: 5px solid var(--primary-color);
    margin: 0 auto 25px;
    box-shadow: var(--shadow-medium);
}

.hero h1 {
    font-size: 4.5em;
    margin-bottom: 15px;
    text-shadow: 2px 2px 5px rgba(0, 0, 0, 0.5);
}

.hero p {
    font-size: 1.5em;
    margin-bottom: 40px;
    font-weight: 300;
}

.social-icons {
    margin-top: 30px;
    margin-bottom: 40px;
}

.social-icons a {
    color: var(--light-text-color);
    font-size: 1.8em;
    margin: 0 15px;
    transition: transform 0.3s ease, color 0.3s ease;
}

.social-icons a:hover {
    color: var(--primary-color);
    transform: translateY(-5px);
}


.about-grid {
    display: block;
    grid-template-columns: 1fr 2fr;
    gap: 50px;
    align-items: center;
    text-align: justify;
}

.about-grid img {
    border-radius: 10px;
    box-shadow: var(--shadow-medium);
    transition: transform 0.3s ease;
}

.about-grid img:hover {
    transform: scale(1.02);
}

.about-text p {
    margin-bottom: 20px;
    font-size: 1.1em;
    line-height: 1.8;
    color: var(--text-color);
}

/* Skills Section */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
    margin-top: 50px;
}

.skill-item {
    background-color: var(--light-text-color);
    padding: 30px;
    border-radius: 10px;
    box-shadow: var(--shadow-light);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    text-align: center;
    border-top: 4px solid var(--primary-color);
}

.skill-item:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-medium);
}

.skill-item i {
    font-size: 3.5em;
    color: var(--primary-color);
    margin-bottom: 20px;
}

.skill-item h3 {
    font-size: 1.8em;
    margin-bottom: 15px;
    color: var(--dark-bg);
}

.skill-item ul {
    padding: 0;
    margin: 0;
    list-style-type: none;
    /* remove default bullet */
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 10px;
}

.skill-item ul li {
    background-color: #e2f0ff;
    color: var(--primary-color);
    padding: 8px 15px;
    border-radius: 20px;
    font-size: 0.95em;
    font-weight: 500;
}

/* Portfolio Section */
.portfolio-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-top: 50px;
}

.portfolio-item {
    background-color: var(--light-text-color);
    border-radius: 10px;
    box-shadow: var(--shadow-light);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    overflow: hidden;
    text-align: left;
}

.portfolio-item:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-medium);
}

.portfolio-item img {
    width: 100%;
    height: 220px;
    object-fit: cover;
    border-bottom: 1px solid var(--border-color);
}

.portfolio-item h3 {
    font-size: 1.6em;
    margin: 20px 20px 10px;
    color: var(--dark-bg);
}

.portfolio-item p {
    font-size: 0.95em;
    margin: 0 20px 20px;
    color: var(--secondary-color);
}

.project-link {
    display: inline-block;
    margin: 0 20px 20px;
    font-weight: 600;
    color: var(--primary-color);
}

.project-link i {
    margin-left: 8px;
    font-size: 0.9em;
}


.gallery-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-top: 50px;
}

.gallery-grid img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    border-radius: 10px;
    box-shadow: var(--shadow-light);
    transition: transform 0.3s ease;
}

.gallery-grid img:hover {
    transform: scale(1.05);
}

.contact-text {
    font-size: 1.1em;
    margin-bottom: 40px;
    color: var(--secondary-color);
}

.contact-form {
    max-width: 600px;
    margin: 0 auto 50px;
    text-align: left;
}

.form-group {
    margin-bottom: 20px;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 15px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-family: 'Poppins', sans-serif;
    font-size: 1em;
    color: var(--text-color);
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.form-group input:focus,
.form-group textarea:focus {
    border-color: var(--primary-color);
    outline: none;
    box-shadow: 0 0 0 3px rgba(0, 123, 255, 0.25);
}

.contact-info {
    margin-top: 30px;
    font-size: 1.1em;
}

.contact-info p {
    margin-bottom: 10px;
}

.contact-info i {
    color: var(--primary-color);
    margin-right: 10px;
}

/* Footer */
footer {
    background-color: var(--dark-bg);
    color: var(--light-text-color);
    padding: 40px 0;
    text-align: center;
    border-top: 5px solid var(--primary-color);
}

footer p {
    margin-bottom: 15px;
    font-size: 1em;
}

.footer-social-icons a {
    color: var(--light-text-color);
    font-size: 1.5em;
    margin: 0 10px;
    transition: color 0.3s ease, transform 0.3s ease;
}

.footer-social-icons a:hover {
    color: var(--primary-color);
    transform: translateY(-3px);
}



@media (max-width: 992px) {
    .hero h1 {
        font-size: 3.5em;
    }

    .hero p {
        font-size: 1.3em;
    }

    .about-grid {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .about-grid img {
        margin: 0 auto 30px;
    }

    .skills-grid,
    .portfolio-grid,
    .gallery-grid {
        grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    }
}

@media (max-width: 768px) {
    .navbar .nav-links {
        position: fixed;
        right: 0;
        top: 0;
        height: 100vh;
        background-color: var(--dark-bg);
        flex-direction: column;
        width: 60%;
        transform: translateX(100%);
        transition: transform 0.5s ease-in;
        justify-content: center;
        align-items: center;
        z-index: 999;
        box-shadow: -5px 0 15px rgba(0, 0, 0, 0.2);
    }

    .nav-links li {
        opacity: 0;
        margin: 25px 0;
    }

    .burger {
        display: flex;
    }

    .nav-active {
        transform: translateX(0%);
    }

    .hero {
        height: 80vh;
        padding: 60px 20px;
    }

    .hero h1 {
        font-size: 3em;
    }

    .hero p {
        font-size: 1.2em;
    }

    .section-card {
        padding: 60px 0;
    }

    .section-card h2 {
        font-size: 2.5em;
    }
}

@media (max-width: 480px) {
    .navbar {
        padding: 15px 20px;
    }

    .navbar .logo a {
        font-size: 1.5em;
    }

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

    .hero p {
        font-size: 1em;
    }

    .social-icons a {
        font-size: 1.5em;
        margin: 0 10px;
    }

    .about-grid,
    .skills-grid,
    .portfolio-grid,
    .gallery-grid {
        grid-template-columns: 1fr;
    }

    .skill-item ul li {
        font-size: 0.9em;
        padding: 7px 12px;
    }

    .form-group input,
    .form-group textarea {
        padding: 12px;
    }
}

/* Nav animasyonları */
.nav-links.nav-active li {
    animation: navLinkFade 0.5s ease forwards;
}

@keyframes navLinkFade {
    from {
        opacity: 0;
        transform: translateX(50px);
    }

    to {
        opacity: 1;
        transform: translateX(0);
    }
}


.toggle .line1 {
    transform: rotate(-45deg) translate(-5px, 6px);
}

.toggle .line2 {
    opacity: 0;
}

.toggle .line3 {
    transform: rotate(45deg) translate(-5px, -6px);
}


@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}



.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
    margin-top: 50px;
}

.skill-item {
    background-color: var(--light-text-color);
    padding: 30px;
    border-radius: 10px;
    box-shadow: var(--shadow-light);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    text-align: center;
    border-top: 4px solid var(--primary-color);
}

.skill-item:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-medium);
}

.skill-item i {
    font-size: 3.5em;
    color: var(--primary-color);
    margin-bottom: 20px;
}

.skill-item h3 {
    font-size: 1.8em;
    margin-bottom: 15px;
    color: var(--dark-bg);
}

.skill-item ul {
    padding: 0;
    margin: 0;
    list-style-type: none;

    display: flex;
    flex-wrap: wrap;

    justify-content: center;
    gap: 10px;
}

.skill-item ul li {
    background-color: #e2f0ff;

    color: var(--primary-color);
    padding: 8px 15px;
    border-radius: 20px;
    font-size: 0.95em;
    font-weight: 500;
    white-space: nowrap;

}


.portfolio-item p {
    font-size: 0.95em;
    margin: 0 20px 20px;

    color: var(--secondary-color);
}



.contact-text {
    font-size: 1.1em;
    margin-bottom: 20px;

    color: var(--secondary-color);
}



.contact-info {
    margin-top: 30px;
    font-size: 1.1em;
}

.contact-info p {
    margin-bottom: 10px;
}

.contact-info i {
    color: var(--primary-color);
    margin-right: 10px;
}