/* --- Modern & Soft Tasarım Ayarları --- */
:root {
    --bg-color: #f4f7f9;
    --text-color: #475569;
    --primary-color: #1e293b;
    --accent-color: #8b5cf6;
    --accent-light: #ede9fe;
    --card-bg: #ffffff;
    --border-color: #e2e8f0;
    --hero-gradient: linear-gradient(135deg, #8b5cf6 0%, #60a5fa 100%);
    
    /* Tooltip Renkleri (Gündüz) */
    --tooltip-bg: #1e293b;
    --tooltip-text: #ffffff;
}

/* --- Karanlık Mod Renkleri --- */
body.dark-mode {
    --bg-color: #0f172a;
    --text-color: #cbd5e1;
    --primary-color: #f8fafc;
    --card-bg: #1e293b;
    --border-color: #334155;
    --accent-light: rgba(139, 92, 246, 0.1);
    
    /* Tooltip Renkleri (Karanlık Modda Okunabilirlik İçin Sabitlendi) */
    --tooltip-bg: #475569; 
    --tooltip-text: #ffffff;
}

html { scroll-behavior: smooth; }
* { margin: 0; padding: 0; box-sizing: border-box; }

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    transition: background-color 0.3s, color 0.3s;
    line-height: 1.6;
}

/* Tema Değiştirme Butonu */
.theme-toggle {
    position: fixed; top: 25px; right: 25px; width: 45px; height: 45px;
    background: var(--card-bg); border-radius: 50%; display: flex;
    justify-content: center; align-items: center; cursor: pointer;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1); z-index: 1000;
    color: var(--accent-color); transition: 0.3s;
}

.theme-toggle:hover { transform: rotate(15deg) scale(1.1); }

/* Üst Kısım */
.hero {
    background: var(--hero-gradient); color: white; padding: 80px 20px;
    text-align: center; border-bottom-left-radius: 30px; border-bottom-right-radius: 30px;
}

.profile-img {
    width: 160px; height: 160px; border-radius: 50%;
    border: 5px solid rgba(255, 255, 255, 0.2); object-fit: cover;
    cursor: pointer; transition: 0.3s;
}

.profile-img:hover { border-color: white; transform: translateY(-5px); }

.contact-link { text-decoration: none; color: inherit; }

.social-links { margin-top: 25px; display: flex; justify-content: center; gap: 20px; align-items: center; }
.social-links a { color: white; font-size: 1.5rem; transition: 0.3s; }
.social-links a:hover { transform: translateY(-5px); }

.download-btn {
    background: white; color: var(--accent-color) !important; padding: 8px 18px;
    border-radius: 25px; font-weight: 600; font-size: 0.85rem;
    text-decoration: none; display: flex; align-items: center; gap: 8px;
    box-shadow: 0 4px 10px rgba(0,0,0,0.1);
}

/* Kartlar ve Düzen */
.container { max-width: 900px; margin: -30px auto 60px auto; padding: 0 20px; }
.card { background: var(--card-bg); padding: 35px; border-radius: 20px; margin-bottom: 25px; border: 1px solid var(--border-color); box-shadow: 0 10px 30px rgba(0,0,0,0.05); }
.card h3 { color: var(--primary-color); margin-bottom: 20px; border-left: 4px solid var(--accent-color); padding-left: 12px; }

/* Yetenekler */
.skill-bar { margin-bottom: 18px; }
.skill-info { display: flex; justify-content: space-between; margin-bottom: 6px; font-size: 0.9rem; font-weight: 500; }
.progress-line { height: 8px; background: var(--border-color); border-radius: 10px; position: relative; overflow: hidden; }
.progress-line span { height: 100%; width: 0; background: var(--accent-color); position: absolute; transition: 1.5s ease-out; border-radius: 10px; }

/* Proje Tooltip Sabitleme */
.project-list li { padding: 15px; border-bottom: 1px solid var(--border-color); position: relative; cursor: help; border-radius: 8px; transition: 0.3s; }
.project-list li:hover { background: var(--bg-color); color: var(--accent-color); padding-left: 20px; }

.project-list li::after {
    content: attr(data-tooltip);
    position: absolute; bottom: 110%; left: 50%; transform: translateX(-50%) translateY(10px);
    background: var(--tooltip-bg); color: var(--tooltip-text);
    padding: 12px 18px; border-radius: 10px; font-size: 0.85rem;
    width: 260px; text-align: center; opacity: 0; visibility: hidden; z-index: 100;
    transition: 0.3s; box-shadow: 0 10px 20px rgba(0,0,0,0.2);
}

.project-list li:hover::after, .project-list li.active::after { opacity: 1; visibility: visible; transform: translateX(-50%) translateY(0); }

/* Modal Penceresi */
.image-modal { position: fixed; top: 0; left: 0; width: 100%; height: 100%; background: rgba(0,0,0,0.85); backdrop-filter: blur(8px); display: flex; justify-content: center; align-items: center; opacity: 0; visibility: hidden; z-index: 2000; transition: 0.4s; cursor: pointer; }
.image-modal.show { opacity: 1; visibility: visible; }
.image-modal img { max-width: 85%; max-height: 80%; border-radius: 15px; border: 3px solid white; }

/* Animasyon Sınıfları */
.animate-on-scroll { opacity: 0; transform: translateY(30px); transition: 0.6s ease-out; }
.animate-on-scroll.show { opacity: 1; transform: translateY(0); }

.grid-layout { display: grid; grid-template-columns: 1fr 1fr; gap: 25px; }

@media (max-width: 768px) {
    .grid-layout { grid-template-columns: 1fr; }
    .hero h1 { font-size: 2rem; }
}