/*:root {
    --bg-dark: #0A0A14;
    --bg-light: #131322;
    --primary: #6E45FF;
    --secondary: #00D1FF;
    --text-light: #EAEBF0;
    --text-dark: #8F94AD;
    --border-color: rgba(255, 255, 255, 0.1);
    --font-heading: 'Poppins', sans-serif;
    --font-body: 'Inter', sans-serif;
    --transition-speed: 0.4s;
    --shadow-color: rgba(0, 0, 0, 0.2);
}

body.light-mode {
    --bg-dark: #F9FAFB;
    --bg-light: #FFFFFF;
    --text-light: #111827;
    --text-dark: #6B7280;
    --border-color: #E5E7EB;
    --shadow-color: rgba(0, 0, 0, 0.08);
}

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

html { scroll-behavior: smooth; }

body {
    font-family: var(--font-body);
    background-color: var(--bg-dark);
    color: var(--text-light);
    line-height: 1.7;
    transition: background-color var(--transition-speed) ease, color var(--transition-speed) ease;
}

body.menu-open { overflow: hidden; }

.container { width: 100%; max-width: 1200px; margin: 0 auto; padding: 0 25px; }


.background {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    background: radial-gradient(circle at 15% 25%, rgba(110, 69, 255, 0.1), transparent 35%),
                radial-gradient(circle at 85% 75%, rgba(0, 209, 255, 0.08), transparent 35%);
    transition: opacity var(--transition-speed) ease;
}
body.light-mode .background { opacity: 0; }

#main-header {
    position: fixed;
    width: 100%;
    padding: 20px 0;
    z-index: 1000;
    transition: background-color var(--transition-speed) ease, box-shadow var(--transition-speed) ease;
}
#main-header.scrolled {
    background-color: rgba(10, 10, 20, 0.9);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    box-shadow: 0 4px 20px var(--shadow-color);
}
body.light-mode #main-header.scrolled {
    background-color: rgba(255, 255, 255, 0.9);
}

#main-header nav { display: flex; justify-content: space-between; align-items: center; }
.logo {
    font-family: var(--font-heading);
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--text-light);
    text-decoration: none;
}
.nav-right { display: flex; align-items: center; gap: 20px; }
.nav-menu { display: flex; list-style: none; gap: 40px; }
.nav-link {
    color: var(--text-dark);
    text-decoration: none;
    font-weight: 500;
    padding: 5px 0;
    position: relative;
    transition: color var(--transition-speed) ease;
}
.nav-link:hover { color: var(--text-light); }
.nav-link::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 100%;
    height: 2px;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    transform: scaleX(0);
    transform-origin: center;
    transition: transform var(--transition-speed) ease;
}
.nav-link.active { color: var(--text-light); }
.nav-link.active::after { transform: scaleX(1); }
.mobile-menu-toggle { display: none; }

.theme-toggle {
    background: var(--bg-light);
    border: 1px solid var(--border-color);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    transition: background-color var(--transition-speed) ease, border-color var(--transition-speed) ease;
}
body.light-mode .theme-toggle {
    background: var(--bg-dark);
    border: 1px solid var(--border-color);
}
.theme-toggle:hover {
    background: var(--primary);
    border-color: var(--primary);
}
.theme-toggle i {
    position: absolute;
    transition: transform 0.5s cubic-bezier(0.68, -0.55, 0.27, 1.55), opacity 0.5s ease;
    font-size: 1rem;
    color: var(--text-dark);
}
body.light-mode .theme-toggle i {
    color: var(--text-dark);
}
.theme-toggle:hover i {
    color: #FFF;
}
.theme-toggle .fa-sun { transform: translateY(0) rotate(0); opacity: 1; }
.theme-toggle .fa-moon { transform: translateY(25px) rotate(45deg); opacity: 0; }
body.light-mode .theme-toggle .fa-sun { transform: translateY(-25px) rotate(-45deg); opacity: 0; }
body.light-mode .theme-toggle .fa-moon { transform: translateY(0) rotate(0); opacity: 1; }


section { padding: 120px 0; overflow: hidden; }
.section-header { text-align: center; margin-bottom: 60px; }
.section-tag {
    display: inline-block;
    padding: 5px 15px;
    border: 1px solid var(--primary);
    border-radius: 20px;
    color: var(--primary);
    font-weight: 500;
    margin-bottom: 15px;
    font-size: 0.9rem;
}
.section-title {
    font-family: var(--font-heading);
    font-size: clamp(2.2rem, 5vw, 3rem);
    margin-bottom: 15px;
    line-height: 1.2;
}
.section-intro {
    max-width: 700px;
    margin: 0 auto;
    color: var(--text-dark);
    font-size: 1.1rem;
}
.cta-button {
    display: inline-block;
    padding: 15px 40px;
    background: var(--primary);
    color: #FFF;
    border-radius: 50px;
    text-decoration: none;
    font-family: var(--font-heading);
    font-weight: 600;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}
.cta-button:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(110, 69, 255, 0.3);
}

.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    text-align: center;
}
.hero-title {
    font-size: clamp(2.8rem, 7vw, 4.5rem);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 25px;
}
.hero-subtitle {
    font-size: clamp(1rem, 3vw, 1.2rem);
    color: var(--text-dark);
    max-width: 700px;
    margin: 0 auto 40px auto;
}

.about {
    background-color: var(--bg-light);
    transition: background-color var(--transition-speed) ease;
}
.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}
.feature-card {
    background: var(--bg-dark);
    padding: 35px;
    border-radius: 16px;
    border: 1px solid var(--border-color);
    text-align: center;
    transition: transform var(--transition-speed) ease, box-shadow var(--transition-speed) ease, background-color var(--transition-speed) ease;
}
.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px var(--shadow-color);
}
.feature-card i {
    font-size: 2.2rem;
    color: var(--primary);
    margin-bottom: 20px;
}
.feature-card h3 {
    font-family: var(--font-heading);
    font-size: 1.4rem;
    margin-bottom: 10px;
}
.feature-card p {
    color: var(--text-dark);
    font-size: 0.95rem;
}


.project-card {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    align-items: center;
    gap: 60px;
    margin-top: 60px;
}
.project-content { order: 1; }
.project-image { order: 2; }
.project-content h3 {
    font-family: var(--font-heading);
    font-size: 2.5rem;
    margin-bottom: 15px;
}
.project-content p {
    color: var(--text-dark);
    margin-bottom: 30px;
    font-size: 1.1rem;
}
.project-links {
    display: flex;
    flex-direction: column;
    gap: 15px;
}
.project-link {
    display: flex;
    align-items: center;
    gap: 15px;
    padding: 15px;
    background-color: var(--bg-light);
    border-radius: 12px;
    text-decoration: none;
    border: 1px solid var(--border-color);
    transition: background-color var(--transition-speed) ease, border-color var(--transition-speed) ease;
}
.project-link:hover {
    background-color: rgba(110, 69, 255, 0.1);
    border-color: var(--primary);
}
.project-link i {
    font-size: 2rem;
    color: var(--secondary);
}
.project-link span {
    color: var(--text-light);
    font-weight: 500;
}
.project-link small {
    color: var(--text-dark);
    font-size: 0.85rem;
}
.project-image img {
    width: 100%;
    border-radius: 16px;
    box-shadow: 0 20px 50px var(--shadow-color);
}


.contact {
    text-align: center;
    background-color: var(--bg-light);
    transition: background-color var(--transition-speed) ease;
}
.contact-button {
    display: inline-block;
    margin-top: 30px;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    color: #FFF;
    padding: 18px 50px;
    border-radius: 50px;
    text-decoration: none;
    font-family: var(--font-heading);
    font-weight: 600;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}
.contact-button:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(110, 69, 255, 0.3);
}


.main-footer {
    padding: 40px 0;
    text-align: center;
    background-color: #080811;
    color: var(--text-dark);
}
body.light-mode .main-footer {
    background-color: #E8ECF3;
}
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: var(--primary);
    color: #FFF;
    border-radius: 50%;
    display: grid;
    place-items: center;
    font-size: 1.2rem;
    text-decoration: none;
    z-index: 999;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: opacity 0.4s ease, visibility 0.4s ease, transform 0.4s ease;
}
.back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}


.fade-in-element {
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.8s ease-out, transform 0.8s ease-out;
}
.fade-in-element.visible {
    opacity: 1;
    transform: translateY(0);
}


@media (max-width: 900px) {
    .project-card { grid-template-columns: 1fr; }
    .project-content { order: 2; text-align: center; }
    .project-image { order: 1; }
    .project-links { align-items: center; }
}

@media (max-width: 768px) {
    .nav-menu {
        display: none;
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100vh;
        background: linear-gradient(135deg, rgba(10, 10, 20, 0.95), rgba(19, 19, 34, 0.95));
        backdrop-filter: blur(12px);
        -webkit-backdrop-filter: blur(12px);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        gap: 50px;
        z-index: 999;
        transform: translateX(100%);
        transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    }
    body.light-mode .nav-menu {
        background: linear-gradient(135deg, rgba(249, 250, 251, 0.95), rgba(255, 255, 255, 0.95));
    }
    
    .nav-menu.active {
        display: flex;
        transform: translateX(0);
    }
    
    .nav-link {
        font-size: 2rem;
        font-weight: 600;
        color: var(--text-light);
        opacity: 0;
        transform: translateY(20px);
        transition: opacity 0.4s ease, transform 0.4s ease;
    }
    
    .nav-menu.active .nav-link {
        opacity: 1;
        transform: translateY(0);
    }
    
    .nav-menu.active .nav-link:nth-child(1) { transition-delay: 0.1s; }
    .nav-menu.active .nav-link:nth-child(2) { transition-delay: 0.2s; }
    .nav-menu.active .nav-link:nth-child(3) { transition-delay: 0.3s; }
    .nav-menu.active .nav-link:nth-child(4) { transition-delay: 0.4s; }
    
    .nav-link:hover {
        color: var(--primary);
    }
    
    .nav-link::after {
        display: none; 
    }
    
    .nav-overlay {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background: rgba(0, 0, 0, 0.7);
        backdrop-filter: blur(6px);
        -webkit-backdrop-filter: blur(6px);
        z-index: 998;
        opacity: 0;
        visibility: hidden;
        transition: opacity 0.4s ease, visibility 0.4s ease;
    }
    body.light-mode .nav-overlay {
        background: rgba(0, 0, 0, 0.5);
    }
    
    .nav-overlay.active {
        opacity: 1;
        visibility: visible;
    }
    
    .mobile-menu-toggle {
        display: flex;
        align-items: center;
        justify-content: center;
        background: var(--bg-light);
        border: 1px solid var(--border-color);
        width: 48px;
        height: 48px;
        border-radius: 12px;
        cursor: pointer;
        z-index: 1001;
        transition: background-color 0.3s ease, transform 0.3s ease, border-color 0.3s ease;
    }
    body.light-mode .mobile-menu-toggle {
        background: var(--bg-dark);
        border: 1px solid var(--border-color);
    }
    
    .mobile-menu-toggle:hover {
        background: var(--primary);
        border-color: var(--primary);
    }
    
    .mobile-menu-toggle i {
        font-size: 1.6rem;
        color: var(--text-light);
        position: absolute;
        transition: opacity 0.3s ease, transform 0.3s ease;
    }
    .mobile-menu-toggle:hover i {
        color: #FFF;
    }
    
    .mobile-menu-toggle .fa-times {
        opacity: 0;
        transform: rotate(90deg);
    }
    
    .mobile-menu-toggle.active .fa-bars {
        opacity: 0;
        transform: rotate(-90deg);
    }
    
    .mobile-menu-toggle.active .fa-times {
        opacity: 1;
        transform: rotate(0);
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
}*/
:root {
    --bg-dark: #0A0A14;
    --bg-light: #131322;
    --primary: #6E45FF;
    --secondary: #00D1FF;
    --text-light: #EAEBF0;
    --text-dark: #8F94AD;
    --border-color: rgba(255, 255, 255, 0.1);
    --font-heading: 'Poppins', sans-serif;
    --font-body: 'Inter', sans-serif;
    --transition-speed: 0.4s;
    --shadow-color: rgba(0, 0, 0, 0.2);
}

body.light-mode {
    --bg-dark: #F9FAFB;
    --bg-light: #FFFFFF;
    --text-light: #111827;
    --text-dark: #6B7280;
    --border-color: #E5E7EB;
    --shadow-color: rgba(0, 0, 0, 0.08);
}

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

html { scroll-behavior: smooth; }

body {
    font-family: var(--font-body);
    background-color: var(--bg-dark);
    color: var(--text-light);
    line-height: 1.7;
    transition: background-color var(--transition-speed) ease, color var(--transition-speed) ease;
}

body.menu-open { overflow: hidden; }

.container { width: 100%; max-width: 1200px; margin: 0 auto; padding: 0 25px; }

/* --- ARKA PLAN VE HEADER --- */
.background {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    background: radial-gradient(circle at 15% 25%, rgba(110, 69, 255, 0.1), transparent 35%),
                radial-gradient(circle at 85% 75%, rgba(0, 209, 255, 0.08), transparent 35%);
    transition: opacity var(--transition-speed) ease;
}
body.light-mode .background { opacity: 0; }

#main-header {
    position: fixed;
    width: 100%;
    padding: 20px 0;
    z-index: 1000;
    transition: background-color var(--transition-speed) ease, box-shadow var(--transition-speed) ease;
}
#main-header.scrolled {
    background-color: rgba(10, 10, 20, 0.9);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    box-shadow: 0 4px 20px var(--shadow-color);
}
body.light-mode #main-header.scrolled {
    background-color: rgba(255, 255, 255, 0.9);
}

#main-header nav { display: flex; justify-content: space-between; align-items: center; }

.logo {
    display: flex;
    align-items: center;
    gap: 12px; /* Resim ve yazı arasında zarif bir boşluk */
    width: auto;
    height: auto;
    text-decoration: none; /* Logo bağlantısında alt çizgi yok */
    transition: transform 0.3s ease;
}

.logo:hover {
    transform: scale(1.05); /* Üzerine gelince hafif büyütme efekti */
}

.logo img {
    display: block;
    width: 50px;
    height: auto;
}

.logo-text {
    font-family: var(--font-heading);
    font-size: 2rem; /* Büyük ve dikkat çekici */
    font-weight: 600; /* Zarif ama güçlü */
    text-decoration: none; /* Alt çizgi kesinlikle yok */
    text-transform: uppercase;
    letter-spacing: 2px; /* Modern harf aralığı */
    background: linear-gradient(90deg, var(--primary), var(--secondary)); /* Gradient renk */
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent; /* Gradient görünümü için */
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.2); /* Hafif gölge */
    transition: transform 0.3s ease, text-shadow 0.3s ease;
}

.logo:hover .logo-text {
    transform: scale(1.1); /* Hover'da yazı hafif büyür */
    text-shadow: 0 4px 8px rgba(110, 69, 255, 0.4); /* Daha belirgin gölge */
}

body.light-mode .logo-text {
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1); /* Açık modda hafif gölge */
}

.nav-right { display: flex; align-items: center; gap: 20px; }
.nav-menu { display: flex; list-style: none; gap: 40px; }
.nav-link {
    color: var(--text-dark);
    text-decoration: none;
    font-weight: 500;
    padding: 5px 0;
    position: relative;
    transition: color var(--transition-speed) ease;
}
.nav-link:hover { color: var(--text-light); }
.nav-link::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 100%;
    height: 2px;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    transform: scaleX(0);
    transform-origin: center;
    transition: transform var(--transition-speed) ease;
}
.nav-link.active { color: var(--text-light); }
.nav-link.active::after { transform: scaleX(1); }
.mobile-menu-toggle { display: none; }

/* --- TEMA DEĞİŞTİRME BUTONU --- */
.theme-toggle {
    background: var(--bg-light);
    border: 1px solid var(--border-color);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    transition: background-color var(--transition-speed) ease, border-color var(--transition-speed) ease;
}
body.light-mode .theme-toggle {
    background: var(--bg-dark);
    border: 1px solid var(--border-color);
}
.theme-toggle:hover {
    background: var(--primary);
    border-color: var(--primary);
}
.theme-toggle i {
    position: absolute;
    transition: transform 0.5s cubic-bezier(0.68, -0.55, 0.27, 1.55), opacity 0.5s ease;
    font-size: 1rem;
    color: var(--text-dark);
}
body.light-mode .theme-toggle i {
    color: var(--text-dark);
}
.theme-toggle:hover i {
    color: #FFF;
}
.theme-toggle .fa-sun { transform: translateY(0) rotate(0); opacity: 1; }
.theme-toggle .fa-moon { transform: translateY(25px) rotate(45deg); opacity: 0; }
body.light-mode .theme-toggle .fa-sun { transform: translateY(-25px) rotate(-45deg); opacity: 0; }
body.light-mode .theme-toggle .fa-moon { transform: translateY(0) rotate(0); opacity: 1; }

/* --- GENEL BÖLÜM STİLLERİ --- */
section { padding: 120px 0; overflow: hidden; }
.section-header { text-align: center; margin-bottom: 60px; }
.section-tag {
    display: inline-block;
    padding: 5px 15px;
    border: 1px solid var(--primary);
    border-radius: 20px;
    color: var(--primary);
    font-weight: 500;
    margin-bottom: 15px;
    font-size: 0.9rem;
}
.section-title {
    font-family: var(--font-heading);
    font-size: clamp(2.2rem, 5vw, 3rem);
    margin-bottom: 15px;
    line-height: 1.2;
}
.section-intro {
    max-width: 700px;
    margin: 0 auto;
    color: var(--text-dark);
    font-size: 1.1rem;
}
.cta-button {
    display: inline-block;
    padding: 15px 40px;
    background: var(--primary);
    color: #FFF;
    border-radius: 50px;
    text-decoration: none;
    font-family: var(--font-heading);
    font-weight: 600;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}
.cta-button:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(110, 69, 255, 0.3);
}

/* --- ANA KARŞILAMA BÖLÜMÜ --- */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    text-align: center;
}
.hero-title {
    font-size: clamp(2.8rem, 7vw, 4.5rem);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 25px;
}
.hero-subtitle {
    font-size: clamp(1rem, 3vw, 1.2rem);
    color: var(--text-dark);
    max-width: 700px;
    margin: 0 auto 40px auto;
}

/* --- FELSEFEMİZ BÖLÜMÜ --- */
.about {
    background-color: var(--bg-light);
    transition: background-color var(--transition-speed) ease;
}
.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}
.feature-card {
    background: var(--bg-dark);
    padding: 35px;
    border-radius: 16px;
    border: 1px solid var(--border-color);
    text-align: center;
    transition: transform var(--transition-speed) ease, box-shadow var(--transition-speed) ease, background-color var(--transition-speed) ease;
}
.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px var(--shadow-color);
}
.feature-card i {
    font-size: 2.2rem;
    color: var(--primary);
    margin-bottom: 20px;
}
.feature-card h3 {
    font-family: var(--font-heading);
    font-size: 1.4rem;
    margin-bottom: 10px;
}
.feature-card p {
    color: var(--text-dark);
    font-size: 0.95rem;
}

/* --- PROJELER BÖLÜMÜ --- */
.project-card {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    align-items: center;
    gap: 60px;
    margin-top: 60px;
}
.project-content { order: 1; }
.project-image { 
    order: 2; 
    position: relative;
    min-height: 400px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-dark);
    border-radius: 16px;
    box-shadow: 0 20px 50px var(--shadow-color);
    overflow: hidden;
}
body.light-mode .project-image {
    background: var(--bg-light);
}
.project-content h3 {
    font-family: var(--font-heading);
    font-size: 2.5rem;
    margin-bottom: 15px;
}
.project-content p {
    color: var(--text-dark);
    margin-bottom: 30px;
    font-size: 1.1rem;
}
.project-links {
    display: flex;
    flex-direction: column;
    gap: 15px;
}
.project-link {
    display: flex;
    align-items: center;
    gap: 15px;
    padding: 15px;
    background-color: var(--bg-light);
    border-radius: 12px;
    text-decoration: none;
    border: 1px solid var(--border-color);
    transition: background-color var(--transition-speed) ease, border-color var(--transition-speed) ease;
}
.project-link:hover {
    background-color: rgba(110, 69, 255, 0.1);
    border-color: var(--primary);
}
.project-link i {
    font-size: 2rem;
    color: var(--secondary);
}
.project-link span {
    color: var(--text-light);
    font-weight: 500;
}
.project-link small {
    color: var(--text-dark);
    font-size: 0.85rem;
}

/* --- GÖRSEL GALERİ --- */
.image-gallery {
    display: flex;
    gap: 30px;
    justify-content: center;
    align-items: center;
    height: 100%;
    padding: 20px;
    flex-wrap: wrap;
}
.image-gallery img {
    width: 200px;
    height: auto;
    max-height: 400px;
    object-fit: cover;
    border-radius: 12px;
    border: 2px solid var(--border-color);
    box-shadow: 0 10px 20px var(--shadow-color);
    transition: transform 0.3s ease;
    cursor: pointer;
}
.image-gallery img:hover {
    transform: translateY(-5px);
}
body.light-mode .image-gallery img {
    border: 2px solid var(--border-color);
}

/* --- TAM EKRAN MODAL --- */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.9);
    z-index: 10000;
    align-items: center;
    justify-content: center;
}
.modal-content {
    max-width: 90%;
    max-height: 90%;
    object-fit: contain;
    border-radius: 10px;
}
.close {
    position: absolute;
    top: 20px;
    right: 30px;
    font-size: 2rem;
    color: var(--text-light);
    cursor: pointer;
}
body.light-mode .close {
    color: var(--text-light);
}
.close:hover {
    color: var(--primary);
}

/* --- İLETİŞİM BÖLÜMÜ --- */
.contact {
    text-align: center;
    background-color: var(--bg-light);
    transition: background-color var(--transition-speed) ease;
}
.contact-button {
    display: inline-block;
    margin-top: 30px;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    color: #FFF;
    padding: 18px 50px;
    border-radius: 50px;
    text-decoration: none;
    font-family: var(--font-heading);
    font-weight: 600;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}
.contact-button:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(110, 69, 255, 0.3);
}

/* --- FOOTER & YUKARI ÇIK BUTONU --- */
.main-footer {
    padding: 40px 0;
    text-align: center;
    background-color: #080811;
    border-top: 1px solid var(--border-color);
}
body.light-mode .main-footer {
    background-color: #E8ECF3;
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 15px;
}

.footer-logo {
    width: 80px;
    opacity: 0.6;
}

.footer-logo img {
    width: 100%;
}
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: var(--primary);
    color: #FFF;
    border-radius: 50%;
    display: grid;
    place-items: center;
    font-size: 1.2rem;
    text-decoration: none;
    z-index: 999;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: opacity 0.4s ease, visibility 0.4s ease, transform 0.4s ease;
}
.back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

/* --- ANİMASYONLAR --- */
.fade-in-element {
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.8s ease-out, transform 0.8s ease-out;
}
.fade-in-element.visible {
    opacity: 1;
    transform: translateY(0);
}

/* --- MOBİL UYUMLULUK --- */
@media (max-width: 900px) {
    .project-card { grid-template-columns: 1fr; }
    .project-content { order: 2; text-align: center; }
    .project-image { 
        order: 1; 
        min-height: auto;
    }
    .image-gallery {
        flex-direction: column;
        gap: 20px;
        padding: 15px;
    }
    .image-gallery img {
        width: 100%;
        max-width: 300px;
        height: auto;
        max-height: 600px;
    }
}

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100vh;
        background: linear-gradient(135deg, rgba(10, 10, 20, 0.95), rgba(19, 19, 34, 0.95));
        backdrop-filter: blur(12px);
        -webkit-backdrop-filter: blur(12px);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        gap: 50px;
        z-index: 999;
        transform: translateX(100%);
        transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    }
    body.light-mode .nav-menu {
        background: linear-gradient(135deg, rgba(249, 250, 251, 0.95), rgba(255, 255, 255, 0.95));
    }
    
    .nav-menu.active {
        display: flex;
        transform: translateX(0);
    }
    
    .nav-link {
        font-size: 2rem;
        font-weight: 600;
        color: var(--text-light);
        opacity: 0;
        transform: translateY(20px);
        transition: opacity 0.4s ease, transform 0.4s ease;
    }
    
    .nav-menu.active .nav-link {
        opacity: 1;
        transform: translateY(0);
    }
    
    .nav-menu.active .nav-link:nth-child(1) { transition-delay: 0.1s; }
    .nav-menu.active .nav-link:nth-child(2) { transition-delay: 0.2s; }
    .nav-menu.active .nav-link:nth-child(3) { transition-delay: 0.3s; }
    .nav-menu.active .nav-link:nth-child(4) { transition-delay: 0.4s; }
    
    .nav-link:hover {
        color: var(--primary);
    }
    
    .nav-link::after {
        display: none;
    }
    
    .nav-overlay {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background: rgba(0, 0, 0, 0.7);
        backdrop-filter: blur(6px);
        -webkit-backdrop-filter: blur(6px);
        z-index: 998;
        opacity: 0;
        visibility: hidden;
        transition: opacity 0.4s ease, visibility 0.4s ease;
    }
    body.light-mode .nav-overlay {
        background: rgba(0, 0, 0, 0.5);
    }
    
    .nav-overlay.active {
        opacity: 1;
        visibility: visible;
    }
    
    .mobile-menu-toggle {
        display: flex;
        align-items: center;
        justify-content: center;
        background: var(--bg-light);
        border: 1px solid var(--border-color);
        width: 48px;
        height: 48px;
        border-radius: 12px;
        cursor: pointer;
        z-index: 1001;
        transition: background-color 0.3s ease, transform 0.3s ease, border-color 0.3s ease;
    }
    body.light-mode .mobile-menu-toggle {
        background: var(--bg-dark);
        border: 1px solid var(--border-color);
    }
    
    .mobile-menu-toggle:hover {
        background: var(--primary);
        border-color: var(--primary);
    }
    
    .mobile-menu-toggle i {
        font-size: 1.6rem;
        color: var(--text-light);
        position: absolute;
        transition: opacity 0.3s ease, transform 0.3s ease;
    }
    .mobile-menu-toggle:hover i {
        color: #FFF;
    }
    
    .mobile-menu-toggle .fa-times {
        opacity: 0;
        transform: rotate(90deg);
    }
    
    .mobile-menu-toggle.active .fa-bars {
        opacity: 0;
        transform: rotate(-90deg);
    }
    
    .mobile-menu-toggle.active .fa-times {
        opacity: 1;
        transform: rotate(0);
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }

    .logo img {
        width: 40px; /* Mobilde logo küçült */
    }
    .logo-text {
        font-size: 1.6rem; /* Mobilde yazı boyutu küçült */
        letter-spacing: 1.5px; /* Mobilde daha az harf aralığı */
        text-decoration: none; /* Mobilde de alt çizgi yok */
    }
}