/* ===== CSS Variables (Dark Only) ===== */
:root {
    --primary-color: #f5f5f5;
    --secondary-color: #cccccc;
    --accent-color: #bbbbbb;

    --bg-primary: #111111;
    --bg-secondary: #1a1a1a;
    --bg-card: #222222;
    --bg-card2: #1b1b1b;

    --text-primary: #f5f5f5;
    --text-secondary: #cccccc;
    --text-light: #999999;

    --border-color: #333333;

    --shadow-light: rgba(255, 255, 255, 0.05);
    --shadow-medium: rgba(255, 255, 255, 0.1);
    --shadow-heavy: rgba(255, 255, 255, 0.2);

    --gradient-primary: linear-gradient(135deg, #eeeeee, #aaaaaa);
    --gradient-accent: linear-gradient(135deg, #bbbbbb, #888888);

    --navbar-glass-bg: rgba(17, 17, 17, 0.8);
}

/* ===== Reset & Base ===== */
* { margin: 0; padding: 0; box-sizing: border-box; -webkit-user-drag: none; user-select: none;}
html { scroll-behavior: smooth; }

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    transition: background-color 0.3s ease, color 0.3s ease;
    overflow-x: hidden;
}

/* ===== Loading Animation ===== */
#loader {
    position: fixed; top: 0; left: 0; width: 100%; height: 100%;
    background: var(--bg-primary);
    display: flex; justify-content: center; align-items: center;
    z-index: 9999; transition: opacity 0.3s ease;
}
.loader-content { text-align: center; }
.spinner {
    width: 50px; height: 50px;
    border: 3px solid var(--border-color);
    border-top: 3px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}
@keyframes spin { 0% { transform: rotate(0deg); } 100% { transform: rotate(360deg); } }

/* ===== Navbar ===== */
.navbar {
    position: fixed; top: 0; width: 100%;
    background: var(--navbar-glass-bg);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000; transition: all 0.3s ease;
}
.navbar.scrolled {
    background: var(--bg-card);
    box-shadow: 0 4px 20px var(--shadow-light);
}
.nav-container {
    max-width: 1200px; margin: 0 auto; padding: 0 2rem;
    display: flex; justify-content: space-between; align-items: center;
    height: 70px;
}
.nav-logo a {
    font-size: 1.5rem; font-weight: 700; color: var(--primary-color);
    text-decoration: none;
    background: var(--gradient-primary);
    -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.nav-menu { display: flex; align-items: center; gap: 2rem; }
.nav-link {
    display: flex; align-items: center; gap: 0.5rem;
    color: var(--text-secondary);
    text-decoration: none; font-weight: 500;
    padding: 0.5rem 1rem; border-radius: 0.5rem;
    transition: all 0.3s ease; position: relative; overflow: hidden;
}
.nav-link:hover, .nav-link.active {
    color: var(--text-secondary); background: var(--bg-card);
}
.nav-link i { font-size: 1.1rem; }

.mobile-menu-btn { display: none; flex-direction: column; cursor: pointer; padding: 0.5rem; }
.mobile-menu-btn span {
    width: 25px; height: 3px; background: var(--text-primary);
    margin: 2px 0; transition: 0.3s; border-radius: 2px;
}
.mobile-menu-btn.active span:nth-child(1) { transform: rotate(-45deg) translate(-5px, 6px); }
.mobile-menu-btn.active span:nth-child(2) { opacity: 0; }
.mobile-menu-btn.active span:nth-child(3) { transform: rotate(45deg) translate(-5px, -6px); }

/* ===== Main Content ===== */
.main-content { min-height: calc(100vh - 70px); margin-top: 70px; padding: 2rem 0; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 2rem; }

/* ===== Hero Section ===== */
.hero { padding: 4rem 0; background: var(--bg-secondary); position: relative; overflow: hidden; }
.hero::before { content: ''; position: absolute; inset: 0; background: var(--gradient-primary); opacity: 0.03; z-index: 0; }
.hero-content { position: relative; z-index: 1; text-align: center; max-width: 800px; margin: 0 auto; }
.hero-title {
    font-size: 3.5rem; font-weight: 700; margin-bottom: 1rem;
    background: var(--gradient-primary);
    -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
    line-height: 1.2;
}
.hero-subtitle { font-size: 1.25rem; color: var(--text-secondary); margin-bottom: 2rem; font-weight: 400; }
.hero-description { font-size: 1.1rem; color: var(--text-light); margin-bottom: 2.5rem; line-height: 1.7; }
.cta-buttons { display: flex; gap: 1rem; justify-content: center; flex-wrap: wrap; }

/* ===== Buttons ===== */
.btn {
    padding: 0.75rem 2rem; border: none; border-radius: 0.5rem;
    font-size: 1rem; font-weight: 600; text-decoration: none; cursor: pointer;
    transition: all 0.3s ease; display: inline-flex; align-items: center; gap: 0.5rem;
    position: relative; overflow: hidden;
}
.btn-primary { background: var(--gradient-primary); color: #111; }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 25px var(--shadow-medium); }
.btn-secondary {
    background: transparent; color: var(--text-primary); border: 2px solid var(--border-color);
}
.btn-secondary:hover { background: var(--bg-card); border-color: var(--primary-color); color: var(--primary-color); }

/* ===== Cards ===== */
.cards-grid {
    display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem; margin: 3rem 0;
}
.card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 1rem; padding: 2rem;
    transition: all 0.3s ease; position: relative; overflow: hidden;
}
.card::before {
    content: ''; position: absolute; top: 0; left: 0; right: 0; height: 4px;
    background: var(--gradient-primary); transform: scaleX(0); transition: transform 0.3s ease;
}
.card:hover { transform: translateY(-5px); box-shadow: 0 20px 40px var(--shadow-medium); }
.card:hover::before { transform: scaleX(1); }
.card-icon {
    width: 60px; height: 60px; background: var(--gradient-primary);
    border-radius: 1rem; display: flex; align-items: center; justify-content: center;
    margin-bottom: 1.5rem; color: #111; font-size: 1.5rem;
}
.card-title { font-size: 1.5rem; font-weight: 600; margin-bottom: 1rem; color: var(--text-primary); }
.card-description { color: var(--text-secondary); line-height: 1.6; margin-bottom: 1.5rem; }
.card-link {
    color: var(--primary-color); text-decoration: none; font-weight: 600;
    display: inline-flex; align-items: center; gap: 0.5rem; transition: gap 0.3s ease;
}
.card-link:hover { gap: 1rem; }

/* ===== Section Styles ===== */
.section { padding: 4rem 0; }
.section-header { text-align: center; margin-bottom: 3rem; }
.section-title {
    font-size: 2.5rem; font-weight: 700; margin-bottom: 1rem;
    background: var(--gradient-primary);
    -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.section-subtitle { font-size: 1.1rem; color: var(--text-secondary); max-width: 600px; margin: 0 auto; }
.section.bg-secondary { background: var(--bg-secondary); }

/* ===== Projects Grid ===== */
.projects-grid {
    display: grid; grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem; margin: 2rem 0; justify-content: center;
}
.project-card {
    background: var(--bg-card); border: 1px solid var(--border-color);
    border-radius: 1rem; overflow: hidden; transition: all 0.3s ease; position: relative;
    max-width: 400px; margin: 0 auto; width: 100%;
}
.project-card:hover { transform: translateY(-8px); box-shadow: 0 25px 50px var(--shadow-medium); }
.project-image {
    height: 200px; background: var(--gradient-accent);
    position: relative; display: flex; align-items: center; justify-content: center;
}
.project-image i { font-size: 3rem; color: #111; opacity: 0.8; }
.project-content { padding: 1.5rem; }
.project-title { font-size: 1.3rem; font-weight: 600; margin-bottom: 0.5rem; color: var(--text-primary); }
.project-description { color: var(--text-secondary); margin-bottom: 1rem; line-height: 1.6; }
.project-tags { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-bottom: 1rem; }
.project-tag {
    color: var(--text-secondary); background: var(--bg-card2);
    padding: 0.25rem 0.75rem; border-radius: 2rem; font-size: 0.85rem; font-weight: 500;
}
.project-links { display: flex; gap: 1rem; }
.project-link { color: var(--accent-color); text-decoration: none; font-weight: 600; display: flex; align-items: center; gap: 0.5rem; transition: all 0.3s ease; }
.project-link:hover { color: var(--text-primary); }

/* ===== About Page (temel) ===== */
.about-content { display: grid; grid-template-columns: 2fr 1fr; gap: 3rem; align-items: start; }
.about-image { text-align: center; }
.profile-image {
    width: 250px;height: 250px;border-radius: 50%;background: var(--gradient-primary);
    display: flex;align-items: center;justify-content: center;
    margin: 0 auto 2rem;box-shadow: 0 20px 40px var(--shadow-medium);overflow: hidden; /* Taşan kısımları gizle */
}

.profile-image img {width: 100%;height: 100%;object-fit: cover; /* Fotoğrafı tam doldurur, taşanı kırpar */border-radius: 50%; /* Resmi de yuvarlak yapar */}

.about-text { font-size: 1.1rem; line-height: 1.8; color: var(--text-secondary); }
.about-text p { margin-bottom: 1.5rem; }
.skills-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(120px, 1fr)); gap: 1rem; margin: 2rem 0; }
.skill-item {
    background: var(--bg-card); border: 1px solid var(--border-color);
    border-radius: 0.5rem; padding: 1rem; text-align: center; transition: all 0.3s ease;
}
.skill-item:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px var(--shadow-light);
    border-color: var(--primary-color);
}
.skill-item i { font-size: 2rem; color: var(--primary-color); margin-bottom: 0.5rem; }
.skill-name { font-weight: 600; color: var(--text-primary); }

/* ===== About Page (GENİŞ) ===== */
.contact-info-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
    border-radius: 1rem;
    padding: 2rem;
    margin-top: 2rem;
}
.contact-info-card:hover { transform: translateY(-5px); box-shadow: 0 15px 30px var(--shadow-light); }

.contact-item { display: flex; align-items: center; gap: 1rem; margin-bottom: 1rem; color: var(--text-secondary); }
.contact-item a { color: inherit; text-decoration: none; }
.contact-item a:hover { text-decoration: underline; }
.contact-item i { color: var(--primary-color); font-size: 1.1rem; width: 20px; text-align: center; }

.about-section-title { font-size: 2rem; font-weight: 700; margin-bottom: 2rem; color: var(--text-primary); }

.about-stats { display: grid; grid-template-columns: repeat(2, 1fr); gap: 2rem; margin-top: 3rem; }
.stat-item {
    text-align: center; padding: 1.5rem; background: var(--bg-card);
    border: 1px solid var(--border-color); border-radius: 1rem; transition: all 0.3s ease;
}
.stat-item:hover { transform: translateY(-5px); box-shadow: 0 15px 30px var(--shadow-light); }
.stat-number { font-size: 2.5rem; font-weight: 700; color: var(--primary-color); margin-bottom: 0.5rem; }
.stat-label { color: var(--text-secondary); font-weight: 500; }

/* Skills (detailed bars) */
.skills-container { display: grid; gap: 3rem; }
.skills-category {
    background: var(--bg-card); width: auto; border: 1px solid var(--border-color);
    border-radius: 1rem; padding: 2rem;
}
.skills-category-title { display: flex; align-items: center; gap: 1rem; font-size: 1.5rem; font-weight: 600; margin-bottom: 2rem; color: var(--text-primary); }
.skills-category-title i { color: var(--primary-color); }
.skill-item-detailed { margin-bottom: 1.5rem; }
.skill-info { display: flex; justify-content: space-between; align-items: center; margin-bottom: 0.5rem; }
.skill-percentage { font-weight: 600; color: var(--primary-color); }
.skill-bar { height: 8px; background: var(--border-color); border-radius: 4px; overflow: hidden; }
.skill-progress { width: 0%; height: 100%; background: var(--gradient-primary); border-radius: 4px; transition: width 1s ease-in-out; }

/* Timeline */
.timeline-container { display: grid; grid-template-columns: 1fr 1fr; gap: 4rem; }
.timeline-section .section-title { text-align: left; margin-bottom: 2rem; display: flex; align-items: center; gap: 1rem; }
.timeline-section .section-title i { color: var(--primary-color); }
.timeline { position: relative; }
.timeline::before {
    content: ''; position: absolute; left: 20px; top: 0; bottom: 0; width: 2px; background: var(--border-color);
}
.timeline-item { position: relative; padding-left: 3rem; margin-bottom: 2rem; }
.timeline-marker {
    position: absolute; left: -8px; top: 0; width: 16px; height: 16px; background: var(--primary-color);
    border-radius: 50%; border: 3px solid var(--bg-primary); z-index: 1; transition: transform .2s ease, background .2s ease;
}
.timeline-item:hover .timeline-marker { transform: scale(1.2); background: var(--secondary-color); }
.timeline-content {
    background: var(--bg-card); border: 1px solid var(--border-color);
    border-radius: 1rem; padding: 1.5rem; transition: all 0.3s ease;
}
.timeline-content:hover { transform: translateY(-3px); box-shadow: 0 10px 25px var(--shadow-light); }
.timeline-content h4 { font-size: 1.2rem; font-weight: 600; margin-bottom: 0.5rem; color: var(--text-primary); }
.timeline-company { color: var(--primary-color); font-weight: 500; margin-bottom: 1rem; font-size: 0.95rem; }
.timeline-description { color: var(--text-secondary); line-height: 1.6; }

/* Services Grid */
.services-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 2rem; justify-content: center;}
.service-card {
    background: var(--bg-card); border: 1px solid var(--border-color); border-radius: 1rem; padding: 2rem; text-align: center;
    transition: transform 0.3s ease, box-shadow 0.3s ease; position: relative; overflow: hidden; 
}
.service-card::before {
    content: ''; position: absolute; top: 0; left: 0; right: 0; height: 4px; background: var(--gradient-primary);
    transform: scaleX(0); transition: transform 0.3s ease; transform-origin: left;
}
.service-card:hover { transform: translateY(-8px) scale(1.02); box-shadow: 0 20px 40px var(--shadow-medium); }
.service-card:hover::before { transform: scaleX(1); }
.service-icon {
    width: 80px; height: 80px; background: var(--gradient-primary); border-radius: 50%; display: flex; align-items: center; justify-content: center;
    margin: 0 auto 1.5rem; color: black; font-size: 2rem;
}
.service-card h3 { font-size: 1.3rem; font-weight: 600; margin-bottom: 1rem; color: var(--text-primary); }
.service-card p { color: var(--text-secondary); margin-bottom: 1.5rem; line-height: 1.6; }
.service-features { list-style: none; text-align: left; padding-left: 0; }
.service-features li { color: var(--text-secondary); margin-bottom: 0.5rem; display: flex; align-items: center; gap: 0.5rem; }
.service-features li::before { content: '✓'; color: var(--primary-color); font-weight: bold; }

/* CTA Section */
.cta-section {
    background: var(--bg-card); border: 1px solid var(--border-color); border-radius: 2rem; padding: 4rem 3rem; text-align: center; position: relative; overflow: hidden;
}
.cta-section::before {
    content: ''; position: absolute; top: 0; left: 0; right: 0; bottom: 0; background: var(--gradient-primary); opacity: 0.05; z-index: 0;
}
.cta-content { position: relative; z-index: 1; }
.cta-content h2 {
    font-size: 2.5rem; font-weight: 700; margin-bottom: 1rem; background: var(--gradient-primary);
    -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.cta-content p { font-size: 1.1rem; color: var(--text-secondary); margin-bottom: 2rem; max-width: 600px; margin-left: auto; margin-right: auto; }
.cta-buttons { display: flex; gap: 1rem; align-items: center; justify-content: center; flex-wrap: wrap; }

/* ===== Filter Section (Projelerim) ===== */
.filter-section { margin-bottom: 2rem; text-align: center; }
.filter-buttons { display: flex; gap: 1rem; justify-content: center; flex-wrap: wrap; }
.filter-btn {
    background: var(--bg-card); border: 1px solid var(--border-color); color: var(--text-secondary);
    padding: 0.75rem 1.5rem; border-radius: 0.5rem; cursor: pointer; transition: all 0.3s ease;
    display: flex; align-items: center; gap: 0.5rem; font-weight: 500;
}
.filter-btn:hover, .filter-btn.active {
    background: var(--primary-color); color: #111; border-color: var(--primary-color);
    transform: translateY(-2px); box-shadow: 0 8px 25px rgba(255,255,255,0.1);
}
.project-card[data-category] { transition: all 0.3s ease; }
.project-card.hidden { opacity: 0; transform: scale(0.9); pointer-events: none; }

/* ===== Footer ===== */
.footer { background: var(--bg-secondary); border-top: 1px solid var(--border-color); padding: 3rem 0 1rem; margin-top: 4rem; }
.footer-container { max-width: 1400px; margin: 0 auto; padding: 0 2rem; }
.footer-content { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 2rem; margin-bottom: 2rem; }
.footer-section h4 { font-size: 1.2rem; font-weight: 600; margin-bottom: 1rem; color: var(--text-primary); }
.contact-info p { color: var(--text-secondary); margin-bottom: 0.5rem; display: flex; align-items: center; gap: 0.5rem; }
.social-links { display: flex; gap: 1rem; }
.social-link {
    width: 40px; height: 40px; background: var(--bg-card);
    border: 1px solid var(--border-color); border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    color: var(--text-secondary); text-decoration: none; transition: all 0.3s ease;
}
.social-link:hover {
    background: var(--text-primary);
    color: var(--bg-primary);
    transform: translateY(-2px);
    box-shadow: 0 8px 20px var(--shadow-medium);
}
.footer-links { display: flex; flex-direction: column; gap: 0.5rem; }
.footer-links a { color: var(--text-secondary); text-decoration: none; transition: color 0.3s ease; }
.footer-links a:hover { color: var(--primary-color); }
.footer-bottom {
    border-top: 1px solid var(--border-color);
    padding-top: 2rem;
    text-align: center;
    color: var(--text-light);
}

/* ===== Animations ===== */
@keyframes fadeUp { from { opacity: 0; transform: translateY(30px); } to { opacity: 1; transform: translateY(0); } }
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
@keyframes slideLeft { from { opacity: 0; transform: translateX(-30px); } to { opacity: 1; transform: translateX(0); } }
@keyframes slideRight { from { opacity: 0; transform: translateX(30px); } to { opacity: 1; transform: translateX(0); } }

.fade-up { opacity: 0; transform: translateY(30px); transition: all 0.6s ease; }
.fade-up.animate-in { opacity: 1; transform: translateY(0); }
.fade-in { opacity: 0; transition: opacity 0.6s ease; }
.fade-in.animate-in { opacity: 1; }
.slide-left { opacity: 0; transform: translateX(-30px); transition: all 0.6s ease; }
.slide-left.animate-in { opacity: 1; transform: translateX(0); }
.slide-right { opacity: 0; transform: translateX(30px); transition: all 0.6s ease; }
.slide-right.animate-in { opacity: 1; transform: translateX(0); }

/* ===== Utilities ===== */
.text-center { text-align: center; } .text-left { text-align: left; } .text-right { text-align: right; }
.mb-1 { margin-bottom: 0.5rem; } .mb-2 { margin-bottom: 1rem; } .mb-3 { margin-bottom: 1.5rem; } .mb-4 { margin-bottom: 2rem; }
.mt-1 { margin-top: 0.5rem; } .mt-2 { margin-top: 1rem; } .mt-3 { margin-top: 1.5rem; } .mt-4 { margin-top: 2rem; }
.p-1 { padding: 0.5rem; } .p-2 { padding: 1rem; } .p-3 { padding: 1.5rem; } .p-4 { padding: 2rem; }
.w-full { width: 100%; } .h-full { height: 100%; }

/* ===== Responsive ===== */
@media (max-width: 1024px) {
    .about-content { grid-template-columns: 1fr; gap: 2rem; text-align: center; }
    .timeline-container { grid-template-columns: 1fr; gap: 3rem; }
}
@media (max-width: 768px) {
    .nav-menu {
        position: fixed; top: 70px; left: 0; width: 100%; height: calc(100vh - 70px);
        background: var(--bg-card); flex-direction: column; justify-content: start;
        padding: 2rem; transform: translateX(-100%);
        border-right: 1px solid var(--border-color);
    }
    .nav-menu.open { transform: translateX(0); width: 40%; transition: transform 0.3s ease; }
    .mobile-menu-btn { display: flex; }
    .hero-title { font-size: 2.5rem; }
    .hero-subtitle { font-size: 1.1rem; }
    .cta-buttons { flex-direction: column; align-items: center; }
    .about-content { grid-template-columns: 1fr; gap: 2rem; }
    .profile-image { width: 200px; height: 200px; font-size: 3rem; }
    .footer-bottom { flex-direction: column; text-align: center; }
    .container { padding: 0 1rem; }
    .nav-container { padding: 0 1rem; }

    .about-stats { grid-template-columns: 1fr 1fr; gap: 1rem; }
    .stat-item { padding: 1rem; }
    .stat-number { font-size: 2rem; }
    .skills-category { padding: 1.5rem; }
    .timeline-item { padding-left: 2rem; }
    .timeline::before { left: 15px; }
    .timeline-marker { left: -6px; width: 12px; height: 12px; }

    .filter-buttons { flex-direction: column; align-items: center; }
    .filter-btn { width: 200px; justify-content: center; }
}
@media (max-width: 480px) {
    .hero-title { font-size: 2rem; }
    .section-title { font-size: 2rem; }
    .cards-grid { grid-template-columns: 1fr; }
    .projects-grid { grid-template-columns: 1fr; }
    .skills-grid { grid-template-columns: repeat(auto-fit, minmax(100px, 1fr)); }

    .about-stats { grid-template-columns: 1fr; }
    .services-grid { grid-template-columns: 1fr; }
    .profile-image { width: 180px; height: 180px; font-size: 3rem; }
    .contact-info-card { padding: 1.5rem; }
    .timeline-content { padding: 1rem; }
    .service-card { padding: 1.5rem; }
    .service-icon { width: 60px; height: 60px; font-size: 1.5rem; }
}

/* ===== Scrollbar ===== */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: var(--bg-secondary); }
::-webkit-scrollbar-thumb { background: var(--border-color); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--primary-color); }