/* Modern Dark Theme */
:root {
    --bg-color: #0f172a;
    --card-bg: #1e293b;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --accent: #38bdf8; /* Sky Blue */
    --accent-hover: #0ea5e9;
}

* { margin: 0; padding: 0; box-sizing: border-box; font-family: 'Segoe UI', sans-serif; }
body { background-color: var(--bg-color); color: var(--text-primary); line-height: 1.6; }
a { text-decoration: none; color: inherit; }

/* Navbar */
.navbar { display: flex; justify-content: space-between; padding: 1.5rem 10%; align-items: center; position: fixed; width: 100%; background: rgba(15, 23, 42, 0.95); z-index: 1000; }
.logo { font-size: 1.5rem; font-weight: bold; color: var(--accent); }
.nav-links { display: flex; gap: 2rem; list-style: none; }
.nav-links a:hover { color: var(--accent); transition: 0.3s; }

/* Hero */
.hero { height: 100vh; display: flex; align-items: center; padding: 0 10%; }
.greeting { color: var(--accent); font-size: 1.2rem; font-weight: 600; }
.name { font-size: 4rem; margin: 10px 0; line-height: 1.1; }
.title { font-size: 2rem; color: var(--text-secondary); margin-bottom: 20px; }
.description { max-width: 600px; color: var(--text-secondary); margin-bottom: 30px; }

/* Buttons */
.buttons { display: flex; gap: 15px; }
.btn { padding: 12px 30px; border-radius: 5px; font-weight: 600; transition: 0.3s; }
.primary { background: var(--accent); color: var(--bg-color); }
.primary:hover { background: var(--accent-hover); }
.secondary { border: 1px solid var(--accent); color: var(--accent); }
.secondary:hover { background: rgba(56, 189, 248, 0.1); }

/* Sections */
.section { padding: 80px 10%; }
.section-title { font-size: 2rem; margin-bottom: 40px; border-left: 5px solid var(--accent); padding-left: 15px; }

/* Skills Grid */
.skills-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 30px; }
.skill-card { background: var(--card-bg); padding: 30px; border-radius: 10px; transition: 0.3s; }
.skill-card:hover { transform: translateY(-5px); border-bottom: 3px solid var(--accent); }
.skill-card i { font-size: 2rem; color: var(--accent); margin-bottom: 20px; }

/* Timeline (Experience) */
.timeline { border-left: 2px solid var(--card-bg); margin-left: 20px; }
.timeline-item { margin-bottom: 40px; padding-left: 30px; position: relative; }
.timeline-item::before { content: ''; width: 12px; height: 12px; background: var(--accent); border-radius: 50%; position: absolute; left: -7px; top: 5px; }
.timeline-date { font-size: 0.9rem; color: var(--accent); margin-bottom: 5px; }
.timeline-content h3 { margin-bottom: 5px; }
.timeline-content h4 { color: var(--text-secondary); font-size: 0.9rem; margin-bottom: 10px; font-style: italic; }

/* Projects */
.projects-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 30px; }
.project-card { background: var(--card-bg); padding: 25px; border-radius: 10px; border: 1px solid transparent; }
.project-card:hover { border-color: var(--accent); }
.tags { display: flex; gap: 10px; margin-top: 15px; flex-wrap: wrap; }
.tags span { font-size: 0.8rem; background: rgba(56, 189, 248, 0.1); color: var(--accent); padding: 5px 10px; border-radius: 15px; }

/* Footer */
.footer { text-align: center; background: var(--card-bg); padding: 50px 10%; }
.social-links { display: flex; justify-content: center; gap: 30px; margin: 30px 0; font-size: 1.5rem; }
.social-links a:hover { color: var(--accent); }
.copyright { font-size: 0.8rem; color: var(--text-secondary); }

/* Mobile */
@media (max-width: 768px) {
    .name { font-size: 2.5rem; }
    .nav-links { display: none; } /* Basitlik için mobilde menüyü gizledim */
}