/* =====================
   GLOBAL STYLES & RESET
===================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Ana renkler */
    --primary-dark: #1a1a2e;
    --secondary-dark: #16213e;
    --accent-blue: #0f4c75;
    --neon-green: #00ff88;
    --light-text: #ffffff;
    --gray-text: #b8b8b8;
    --card-bg: rgba(255, 255, 255, 0.05);
    --hover-bg: rgba(0, 255, 136, 0.1);
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f4c75 100%);
    --gradient-accent: linear-gradient(45deg, #00ff88, #00d4ff);
    --gradient-card: linear-gradient(145deg, rgba(255,255,255,0.05), rgba(255,255,255,0.02));
    
    /* Shadows */
    --shadow-light: 0 5px 15px rgba(0, 0, 0, 0.1);
    --shadow-medium: 0 10px 30px rgba(0, 0, 0, 0.2);
    --shadow-heavy: 0 20px 60px rgba(0, 0, 0, 0.3);
    --glow-neon: 0 0 20px rgba(0, 255, 136, 0.3);
    
    /* Typography */
    --font-primary: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    --font-size-xl: clamp(2.5rem, 5vw, 4rem);
    --font-size-lg: clamp(1.8rem, 3.5vw, 2.5rem);
    --font-size-md: clamp(1.2rem, 2vw, 1.5rem);
    --font-size-sm: clamp(0.9rem, 1.5vw, 1.1rem);
    
    /* Spacing */
    --section-padding: clamp(3rem, 8vw, 6rem);
    --container-padding: clamp(1rem, 4vw, 2rem);
}

body {
    font-family: var(--font-primary);
    background: var(--gradient-primary);
    color: var(--light-text);
    line-height: 1.6;
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

/* =====================
   HEADER & NAVIGATION
===================== */
.header {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(26, 26, 46, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    transition: all 0.3s ease;
    border-bottom: 1px solid rgba(0, 255, 136, 0.1);
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem var(--container-padding);
}

.nav-brand h2 {
    background: var(--gradient-accent);
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    font-size: var(--font-size-md);
    font-weight: 700;
}

.nav-list {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-link {
    color: var(--gray-text);
    text-decoration: none;
    font-weight: 500;
    position: relative;
    transition: all 0.3s ease;
}

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

.nav-link:hover,
.nav-link.active {
    color: var(--neon-green);
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

/* Mobile Navigation Toggle */
.nav-toggle {
    display: none;
    flex-direction: column;
    cursor: pointer;
}

.bar {
    width: 25px;
    height: 3px;
    background: var(--neon-green);
    margin: 3px 0;
    transition: 0.3s;
}

/* =====================
   HERO SECTION
===================== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    padding-top: 80px;
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: center;
    width: 100%;
    max-width: 1200px;
    padding: 0 var(--container-padding);
}

.hero-title {
    font-size: var(--font-size-xl);
    font-weight: 700;
    margin-bottom: 1rem;
    line-height: 1.2;
}

.highlight {
    background: var(--gradient-accent);
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    position: relative;
}

.hero-subtitle {
    font-size: var(--font-size-lg);
    color: var(--gray-text);
    margin-bottom: 1rem;
    font-weight: 300;
}

.hero-description {
    font-size: var(--font-size-sm);
    color: var(--gray-text);
    margin-bottom: 2rem;
    line-height: 1.8;
}

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

.btn {
    padding: 12px 30px;
    border: none;
    border-radius: 50px;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.3s ease;
    cursor: pointer;
    position: relative;
    overflow: hidden;
    text-align: center;
    min-width: 150px;
}

.btn-primary {
    background: var(--gradient-accent);
    color: var(--primary-dark);
    box-shadow: var(--glow-neon);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 30px rgba(0, 255, 136, 0.5);
}

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

.btn-outline:hover {
    background: var(--neon-green);
    color: var(--primary-dark);
    transform: translateY(-2px);
}

/* Hero Image */
.hero-image {
    display: flex;
    justify-content: center;
    align-items: center;
}

.profile-placeholder {
    width: 300px;
    height: 300px;
    background: var(--gradient-card);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 3px solid rgba(0, 255, 136, 0.3);
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-heavy);
}

.profile-placeholder::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: conic-gradient(transparent, rgba(0, 255, 136, 0.1), transparent, rgba(0, 212, 255, 0.1));
    animation: rotate 4s linear infinite;
}

.profile-placeholder i {
    font-size: 6rem;
    color: var(--neon-green);
    z-index: 2;
}

/* Scroll Indicator */
.scroll-indicator {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
}

.scroll-arrow {
    width: 20px;
    height: 20px;
    border-right: 2px solid var(--neon-green);
    border-bottom: 2px solid var(--neon-green);
    transform: rotate(45deg);
    animation: bounce 2s infinite;
}

/* =====================
   SECTIONS
===================== */
.section-title {
    font-size: var(--font-size-lg);
    text-align: center;
    margin-bottom: 3rem;
    position: relative;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 3px;
    background: var(--gradient-accent);
    border-radius: 2px;
}

/* About Section */
.about {
    padding: var(--section-padding) 0;
    background: linear-gradient(180deg, transparent 0%, rgba(15, 76, 117, 0.1) 100%);
}

.about-text p {
    font-size: var(--font-size-sm);
    color: var(--gray-text);
    margin-bottom: 1.5rem;
    line-height: 1.8;
}

.about-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.stat {
    text-align: center;
    padding: 1.5rem;
    background: var(--gradient-card);
    border-radius: 15px;
    border: 1px solid rgba(0, 255, 136, 0.1);
    transition: all 0.3s ease;
}

.stat:hover {
    transform: translateY(-5px);
    border-color: var(--neon-green);
    box-shadow: var(--glow-neon);
}

.stat h3 {
    font-size: 2rem;
    color: var(--neon-green);
    margin-bottom: 0.5rem;
}

.stat p {
    color: var(--gray-text);
    font-size: 0.9rem;
}

/* Skills Section */
.skills {
    padding: var(--section-padding) 0;
    background: rgba(22, 33, 62, 0.3);
}

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

.skill-category {
    background: var(--gradient-card);
    padding: 2rem;
    border-radius: 20px;
    border: 1px solid rgba(0, 255, 136, 0.1);
    transition: all 0.3s ease;
}

.skill-category:hover {
    transform: translateY(-10px);
    border-color: var(--neon-green);
    box-shadow: var(--glow-neon);
}

.skill-category h3 {
    color: var(--neon-green);
    margin-bottom: 1.5rem;
    font-size: 1.3rem;
}

.skill-items {
    display: grid;
    gap: 1rem;
}

.skill-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0.8rem;
    background: rgba(255, 255, 255, 0.03);
    border-radius: 10px;
    transition: all 0.3s ease;
}

.skill-item:hover {
    background: var(--hover-bg);
    transform: translateX(10px);
}

.skill-item i {
    font-size: 1.5rem;
    color: var(--neon-green);
    width: 30px;
}

/* Projects Preview */
.projects-preview {
    padding: var(--section-padding) 0;
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

.project-card {
    background: var(--gradient-card);
    padding: 2rem;
    border-radius: 20px;
    border: 1px solid rgba(0, 255, 136, 0.1);
    transition: all 0.3s ease;
    text-align: center;
}

.project-card:hover {
    transform: translateY(-10px) scale(1.02);
    border-color: var(--neon-green);
    box-shadow: var(--glow-neon);
}

.project-icon {
    width: 60px;
    height: 60px;
    margin: 0 auto 1rem;
    background: var(--gradient-accent);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.project-icon i {
    font-size: 1.5rem;
    color: var(--primary-dark);
}

.project-card h3 {
    color: var(--light-text);
    margin-bottom: 1rem;
    font-size: 1.2rem;
}

.project-card p {
    color: var(--gray-text);
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.project-tech {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    justify-content: center;
}

.project-tech span {
    background: rgba(0, 255, 136, 0.1);
    color: var(--neon-green);
    padding: 0.3rem 0.8rem;
    border-radius: 20px;
    font-size: 0.8rem;
    border: 1px solid rgba(0, 255, 136, 0.3);
}

.projects-cta {
    text-align: center;
}

/* =====================
   FOOTER
===================== */
.footer {
    background: var(--primary-dark);
    padding: 3rem 0 1rem;
    border-top: 1px solid rgba(0, 255, 136, 0.1);
}

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

.footer-section h3,
.footer-section h4 {
    color: var(--neon-green);
    margin-bottom: 1rem;
}

.footer-section p,
.footer-section li {
    color: var(--gray-text);
    line-height: 1.6;
}

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

.footer-section a {
    color: var(--gray-text);
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-section a:hover {
    color: var(--neon-green);
}

.social-links {
    display: flex;
    gap: 1rem;
}

.social-link {
    width: 40px;
    height: 40px;
    background: var(--gradient-card);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    border: 1px solid rgba(0, 255, 136, 0.1);
}

.social-link:hover {
    background: var(--neon-green);
    color: var(--primary-dark) !important;
    transform: translateY(-3px);
    box-shadow: var(--glow-neon);
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--gray-text);
}

/* =====================
   ANIMATIONS
===================== */
@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {
        transform: translateY(0) rotate(45deg);
    }
    40% {
        transform: translateY(-10px) rotate(45deg);
    }
    60% {
        transform: translateY(-5px) rotate(45deg);
    }
}

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

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(50px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* =====================
   RESPONSIVE DESIGN
===================== */
@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 70px);
        background: rgba(26, 26, 46, 0.98);
        backdrop-filter: blur(10px);
        flex-direction: column;
        justify-content: flex-start;
        align-items: center;
        transition: all 0.3s ease;
        padding-top: 2rem;
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .nav-list {
        flex-direction: column;
        gap: 2rem;
        text-align: center;
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .nav-toggle.active .bar:nth-child(2) {
        opacity: 0;
    }
    
    .nav-toggle.active .bar:nth-child(1) {
        transform: translateY(9px) rotate(45deg);
    }
    
    .nav-toggle.active .bar:nth-child(3) {
        transform: translateY(-9px) rotate(-45deg);
    }
    
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 2rem;
    }
    
    .hero-image {
        order: -1;
    }
    
    .profile-placeholder {
        width: 250px;
        height: 250px;
    }
    
    .profile-placeholder i {
        font-size: 4rem;
    }
    
    .hero-buttons {
        justify-content: center;
    }
    
    .about-stats {
        grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
    }
    
    .skills-grid {
        grid-template-columns: 1fr;
    }
    
    .projects-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    :root {
        --container-padding: 1rem;
        --section-padding: 2rem;
    }
    
    .btn {
        min-width: 120px;
        padding: 10px 20px;
    }
    
    .profile-placeholder {
        width: 200px;
        height: 200px;
    }
    
    .profile-placeholder i {
        font-size: 3rem;
    }
}