:root {
    /* Colors */
    --primary: #667eea;
    --secondary: #764ba2;
    --accent: #f093fb;
    --success: #10b981;
    --warning: #f59e0b;
    --error: #ef4444;
    --dark: #0f172a;
    --light: #ffffff;
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    --gradient-accent: linear-gradient(135deg, var(--accent) 0%, var(--primary) 100%);
    --gradient-dark: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-light: linear-gradient(135deg, #ffecd2 0%, #fcb69f 100%);
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px -1px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    
    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 4rem;
    
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;
    --font-size-5xl: 3rem;
    --font-size-6xl: 3.75rem;
    
    /* Borders */
    --border-radius: 0.375rem;
    --border-radius-md: 0.5rem;
    --border-radius-lg: 0.75rem;
    --border-radius-xl: 1rem;
    --border-radius-2xl: 1.5rem;
    --border-radius-full: 9999px;
    
    /* Transitions */
    --transition-fast: 0.15s ease-in-out;
    --transition-base: 0.2s ease-in-out;
    --transition-slow: 0.3s ease-in-out;
}

/* Reset & Base */
*, *::before, *::after {
    box-sizing: border-box;
}

* {
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-family);
    line-height: 1.6;
    color: var(--gray-800);
    background: var(--gradient-dark);
    min-height: 100vh;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
    margin-bottom: var(--space-md);
    color: var(--gray-900);
}

h1 { font-size: var(--font-size-5xl); }
h2 { font-size: var(--font-size-4xl); }
h3 { font-size: var(--font-size-3xl); }
h4 { font-size: var(--font-size-2xl); }
h5 { font-size: var(--font-size-xl); }
h6 { font-size: var(--font-size-lg); }

p {
    margin-bottom: var(--space-md);
    color: var(--gray-600);
    line-height: 1.7;
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-xl);
}

/* Header */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.2);
    transition: all var(--transition-base);
}

.header.scrolled {
    background: rgba(255, 255, 255, 0.95);
    border-bottom-color: var(--gray-200);
    box-shadow: var(--shadow);
}

.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-lg) 0;
}

.nav__logo {
    font-size: var(--font-size-xl);
    font-weight: 800;
    color: white;
    text-decoration: none;
    transition: all var(--transition-base);
}

.header.scrolled .nav__logo {
    color: var(--gray-900);
}

.nav__menu {
    display: flex;
    list-style: none;
    gap: var(--space-2xl);
}

.nav__link {
    color: rgba(255, 255, 255, 0.9);
    text-decoration: none;
    font-weight: 500;
    position: relative;
    transition: all var(--transition-base);
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--border-radius-lg);
}

.nav__link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background: var(--gradient-accent);
    transition: all var(--transition-base);
    transform: translateX(-50%);
}

.nav__link:hover::after,
.nav__link.active::after {
    width: 80%;
}

.nav__link:hover {
    background: rgba(255, 255, 255, 0.1);
}

.header.scrolled .nav__link {
    color: var(--gray-700);
}

.header.scrolled .nav__link:hover {
    color: var(--primary);
    background: rgba(102, 126, 234, 0.1);
}

/* Hero Section - Enhanced */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    color: white;
    background: var(--gradient-dark);
    overflow: hidden;
}

/* Animated Background */
.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 20% 50%, rgba(120, 119, 198, 0.3) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(255, 119, 198, 0.3) 0%, transparent 50%),
        radial-gradient(circle at 40% 80%, rgba(120, 219, 255, 0.3) 0%, transparent 50%);
    animation: gradientShift 8s ease-in-out infinite;
}

@keyframes gradientShift {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.8; }
}

/* Floating Particles */
.hero::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="particles" width="20" height="20" patternUnits="userSpaceOnUse"><circle cx="10" cy="10" r="1" fill="rgba(255,255,255,0.1)"/></pattern></defs><rect width="100%" height="100%" fill="url(%23particles)"/></svg>') repeat;
    animation: floatParticles 20s linear infinite;
    pointer-events: none;
}

@keyframes floatParticles {
    0% { transform: translateY(0px); }
    100% { transform: translateY(-100px); }
}

.hero__content {
    position: relative;
    z-index: 3;
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.hero__avatar {
    width: 300px;
    height: 300px;
    border-radius: 50%;
    margin: 0 auto var(--space-2xl);
    border: 4px solid rgba(255, 255, 255, 0.2);
    overflow: hidden; /* Foto taşmasın diye */
    position: relative;
    animation: heroFloat 6s ease-in-out infinite;
    box-shadow: var(--shadow-2xl), 0 0 40px rgba(240, 147, 251, 0.4);
}

.hero__avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 50%;
}


@keyframes heroFloat {
    0%, 100% { transform: translateY(0px) rotate(0deg); }
    50% { transform: translateY(-20px) rotate(5deg); }
}

.hero__avatar::before {
    content: '';
    position: absolute;
    inset: -5px;
    border-radius: inherit;
    background: conic-gradient(from 0deg, transparent, rgba(255, 255, 255, 0.4), transparent);
    animation: rotate 4s linear infinite;
    z-index: -1;
}

@keyframes rotate {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.hero__title {
    font-size: clamp(2.5rem, 5vw, 4.5rem);
    font-weight: 800;
    margin-bottom: var(--space-lg);
    background: linear-gradient(135deg, #ffffff 0%, #f0f9ff 50%, #e0f2fe 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-shadow: 0 0 30px rgba(255, 255, 255, 0.5);
    animation: titleGlow 3s ease-in-out infinite alternate;
}

@keyframes titleGlow {
    0% { text-shadow: 0 0 30px rgba(255, 255, 255, 0.5); }
    100% { text-shadow: 0 0 50px rgba(255, 255, 255, 0.8), 0 0 60px rgba(102, 126, 234, 0.6); }
}

.hero__subtitle {
    font-size: var(--font-size-xl);
    margin-bottom: var(--space-2xl);
    opacity: 0.9;
    font-weight: 400;
}
.btn {
    display: inline-block;
    background: linear-gradient(45deg, #ffd700, #ff6b6b);
    color: white;
    padding: 12px 30px;
    text-decoration: none;
    border-radius: 50px;
    font-weight: bold;
    transition: all 0.3s ease;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
    font-size: 16px;
}

.btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.3);
}
/* Sections */
.section {
    padding: 6rem 0;
    position: relative;
    background: white;
}

.section:nth-child(even) {
    background: var(--gray-50);
}

.section__header {
    text-align: center;
    margin-bottom: 4rem;
}

.section__title {
    position: relative;
    display: inline-block;
    font-size: var(--font-size-4xl);
    font-weight: 700;
}

.section__title::after {
    content: '';
    position: absolute;
    bottom: -0.5rem;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background: var(--gradient-primary);
    border-radius: var(--border-radius);
}

.section__subtitle {
    font-size: var(--font-size-lg);
    color: var(--gray-600);
    margin-top: var(--space-md);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* About Section */
.about__content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 4rem;
    align-items: center;
}

.about__image {
    position: relative;
    border-radius: var(--border-radius-2xl);
    overflow: hidden;
    background: var(--gradient-primary);
    aspect-ratio: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 4rem;
    color: white;
    box-shadow: var(--shadow-xl);
    transition: transform var(--transition-base);
}

.about__image:hover {
    transform: scale(1.05) rotate(2deg);
}

.about__image::before {
    content: '';
    position: absolute;
    top: 20px;
    left: 20px;
    right: 20px;
    bottom: 20px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: inherit;
}

.about__text {
    font-size: var(--font-size-lg);
    line-height: 1.8;
}

.about__text p {
    margin-bottom: 1.5rem;
}

.about__stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-xl);
    margin-top: var(--space-2xl);
}

.stat {
    text-align: center;
    padding: var(--space-lg);
    background: white;
    border-radius: var(--border-radius-xl);
    box-shadow: var(--shadow);
    transition: transform var(--transition-base);
}

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

.stat__number {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    color: var(--primary);
    margin-bottom: var(--space-sm);
}

.stat__label {
    color: var(--gray-600);
    font-weight: 500;
}

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

.skill-card {
    background: white;
    padding: 2.5rem;
    border-radius: var(--border-radius-2xl);
    box-shadow: var(--shadow);
    text-align: center;
    transition: all var(--transition-base);
    border: 1px solid var(--gray-200);
    position: relative;
    overflow: hidden;
}

.skill-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 2px;
    background: var(--gradient-primary);
    transition: left var(--transition-slow);
}

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

.skill-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary);
}

.skill-card__icon {
    width: 70px;
    height: 70px;
    margin: 0 auto var(--space-lg);
    background: var(--gradient-primary);
    border-radius: var(--border-radius-xl);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.75rem;
    box-shadow: var(--shadow-lg);
}

.skill-card__title {
    margin-bottom: var(--space-lg);
    font-size: var(--font-size-xl);
}

.skill-card__list {
    list-style: none;
}

.skill-card__list li {
    background: var(--gray-50);
    padding: var(--space-sm) var(--space-md);
    margin: var(--space-sm) 0;
    border-radius: var(--border-radius-full);
    font-size: var(--font-size-sm);
    color: var(--gray-700);
    transition: all var(--transition-fast);
}

.skill-card__list li:hover {
    background: var(--primary);
    color: white;
    transform: translateX(5px);
}

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

.project-card {
    background: white;
    border-radius: var(--border-radius-2xl);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: all var(--transition-base);
    border: 1px solid var(--gray-200);
    position: relative;
}

.project-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-xl);
}

.project-card__image {
    height: 200px;
    background: var(--gradient-accent);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 3rem;
    position: relative;
    overflow: hidden;
}

.project-card__image::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left var(--transition-slow);
}

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

.project-card__content {
    padding: 1.5rem;
}

.project-card__title {
    font-size: var(--font-size-xl);
    margin-bottom: var(--space-md);
    font-weight: 600;
}

.project-card__description {
    color: var(--gray-600);
    margin-bottom: var(--space-lg);
    line-height: 1.6;
}

.project-card__tech {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
    margin-bottom: var(--space-lg);
}

.tech-tag {
    background: var(--gray-100);
    color: var(--gray-700);
    padding: var(--space-xs) var(--space-sm);
    border-radius: var(--border-radius);
    font-size: var(--font-size-xs);
    font-weight: 500;
}

.project-card__links {
    display: flex;
    gap: var(--space-md);
}

.project-link {
    padding: var(--space-sm) var(--space-lg);
    border-radius: var(--border-radius-lg);
    text-decoration: none;
    font-weight: 500;
    font-size: var(--font-size-sm);
    transition: all var(--transition-fast);
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
}

.project-link--primary {
    background: var(--primary);
    color: white;
}

.project-link--primary:hover {
    background: var(--secondary);
    transform: translateY(-2px);
}

.project-link--secondary {
    background: var(--gray-100);
    color: var(--gray-700);
    border: 1px solid var(--gray-200);
}

.project-link--secondary:hover {
    background: var(--gray-200);
    transform: translateY(-2px);
}

/* Contact Section */
.contact__content {
    text-align: center;
    max-width: 600px;
    margin: 0 auto;
}

.contact__info {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    margin: var(--space-2xl) 0;
}

.contact-item {
    background: white;
    padding: var(--space-xl);
    border-radius: var(--border-radius-xl);
    box-shadow: var(--shadow);
    transition: all var(--transition-base);
    border: 1px solid var(--gray-200);
}

.contact-item:hover {
    transform: translateY(-5px);
    border-color: var(--primary);
}

.contact-item i {
    font-size: var(--font-size-2xl);
    color: var(--primary);
    margin-bottom: var(--space-md);
}

.contact-item h4 {
    font-size: var(--font-size-lg);
    margin-bottom: var(--space-sm);
}

.contact-item p {
    color: var(--gray-600);
    margin: 0;
}

.social-links {
    display: flex;
    justify-content: center;
    gap: var(--space-lg);
    margin-top: var(--space-2xl);
}

.social-link {
    width: 60px;
    height: 60px;
    background: var(--gradient-primary);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    font-size: var(--font-size-xl);
    transition: all var(--transition-base);
    box-shadow: var(--shadow);
    position: relative;
    overflow: hidden;
}

.social-link::before {
    content: '';
    position: absolute;
    inset: 0;
    background: var(--gradient-accent);
    opacity: 0;
    transition: opacity var(--transition-base);
}

.social-link:hover::before {
    opacity: 1;
}

.social-link:hover {
    transform: translateY(-5px) scale(1.1);
    box-shadow: var(--shadow-xl);
}

.social-link i {
    position: relative;
    z-index: 2;
}

/* Footer */
.footer {
    background: var(--gray-900);
    color: var(--gray-400);
    text-align: center;
    padding: var(--space-2xl) 0;
    border-top: 1px solid var(--gray-800);
}

.footer p {
    margin: 0;
    color: var(--gray-400);
}

/* Utility Classes */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

.slide-in-left {
    opacity: 0;
    transform: translateX(-50px);
    transition: all 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

.slide-in-left.visible {
    opacity: 1;
    transform: translateX(0);
}

.slide-in-right {
    opacity: 0;
    transform: translateX(50px);
    transition: all 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

.slide-in-right.visible {
    opacity: 1;
    transform: translateX(0);
}

/* Mobile Responsive */
@media (max-width: 768px) {
    .container {
        padding: 0 var(--space-md);
    }

    .nav__menu {
        display: none;
    }

    .hero__title {
        font-size: var(--font-size-4xl);
    }

    .hero__avatar {
        width: 180px;
        height: 180px;
        font-size: 4rem;
    }

    .about__content {
        grid-template-columns: 1fr;
        text-align: center;
        gap: var(--space-2xl);
    }

    .about__stats {
        grid-template-columns: 1fr;
    }

    .skills__grid,
    .projects__grid {
        grid-template-columns: 1fr;
    }

    .contact__info {
        grid-template-columns: 1fr;
    }

    .social-links {
        gap: var(--space-md);
    }

    .section {
        padding: 4rem 0;
    }
}

/* Dark Mode Support */
@media (prefers-color-scheme: dark) {
    .section {
        background: var(--gray-900);
        color: var(--gray-100);
    }

    .section:nth-child(even) {
        background: var(--gray-800);
    }

    .skill-card,
    .project-card,
    .contact-item {
        background: var(--gray-800);
        border-color: var(--gray-700);
        color: var(--gray-100);
    }
}