:root {
    --bg-color: #0F172A;
    --text-primary: #E5E7EB;
    --text-secondary: #94A3B8;
    --accent-color: #38BDF8;
    --panel-bg: rgba(2, 6, 23, 0.85);
    --transition-speed: 0.6s;
    --ease: cubic-bezier(0.23, 1, 0.32, 1);
    
    /* Glassmorphism Değişkenleri (Dark Mode Varsayılan) */
    --glass-bg: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.1);
    --card-bg-gradient: linear-gradient(180deg, rgba(255,255,255,0.07) 0%, rgba(255,255,255,0.02) 100%);
    --glow-color: rgba(56, 189, 248, 0.15);
    --glow-blend: screen;
}

/* --- LIGHT MODE --- */
[data-theme="light"] {
    --bg-color: #f1f5f9; /* Slate 100 */
    --text-primary: #1e293b; /* Slate 800 */
    --text-secondary: #64748b; /* Slate 500 */
    --panel-bg: rgba(255, 255, 255, 0.85);
    
    /* Glassmorphism (Light Mode) */
    --glass-bg: rgba(0, 0, 0, 0.05);
    --glass-border: rgba(0, 0, 0, 0.1);
    --card-bg-gradient: linear-gradient(180deg, #ffffff 0%, #f8fafc 100%);
    --glow-color: rgba(56, 189, 248, 0.1);
    --glow-blend: multiply;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    height: 100dvh; /* Mobil tarayıcılar için dinamik yükseklik */
    width: 100%;
    overflow-x: hidden; /* Yatay kaymayı engelle */
    overscroll-behavior: none; /* Mobilde sayfa yaylanmasını engelle (Pull-to-refresh vb.) */
    cursor: default; /* Varsayılan imleç */
}

/* --- LOADING SCREEN --- */
#loading-screen {
    position: fixed;
    inset: 0;
    background-color: var(--bg-color);
    z-index: 9999;
    display: flex;
    justify-content: center;
    align-items: center;
    transition: opacity 0.5s ease, visibility 0.5s ease;
}

#loading-screen.fade-out {
    opacity: 0;
    visibility: hidden;
}

.loader-content {
    text-align: center;
}

.loader-text {
    font-size: 2rem;
    font-weight: 800;
    color: white;
    display: block;
    margin-bottom: 1rem;
    letter-spacing: 2px;
    animation: pulseText 2s infinite;
}

.loader-message {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 1rem;
    min-height: 1.2em;
}

.loader-line {
    width: 200px;
    height: 4px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 2px;
    overflow: hidden;
    margin: 0 auto;
    position: relative;
}

.loader-line::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    height: 100%;
    width: var(--load-progress, 0%);
    background: var(--accent-color);
    transition: width 0.3s ease-out;
}

@keyframes pulseText {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

/* --- GLOW EFEKTİ --- */
.cursor-glow {
    position: fixed;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, var(--glow-color) 0%, rgba(0, 0, 0, 0) 70%);
    border-radius: 50%;
    pointer-events: none; /* Tıklamaları engellememesi için kritik */
    transform: translate(-50%, -50%);
    z-index: 0;
    mix-blend-mode: var(--glow-blend);
    transition: width 0.2s, height 0.2s; /* Hover durumunda büyütmek isterseniz */
}

.bg-gradient {
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at center, #0F172A 0%, #020617 100%);
    z-index: -1;
}

/* --- PARÇACIKLAR (PARTICLES) --- */
#particles {
    position: fixed;
    inset: 0;
    z-index: 0;
    pointer-events: none;
}

/* --- ANA EKRAN --- */
.hub-container {
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: 2rem;
    /* opacity: 1; transition: all 0.5s ease; -> Bu satırları profile-content'e taşıdık veya aşağıda ezdik */
    position: relative;
    z-index: 1;
    perspective: 1000px; /* 3D derinlik için */
}

/* Profil Kartı (3D Tilt) */
.profile-content {
    /* Görsel stilleri iç katmanlara taşıdık */
    background: transparent;
    padding: 0;
    border: none;
    box-shadow: none;
    backdrop-filter: none;
    
    transform-style: preserve-3d; /* İçeriklerin de 3D davranması için */
    transition: transform 0.1s ease; /* Yumuşak takip */
    max-width: 600px;
    width: 100%;
    cursor: pointer;
}

.profile-flipper {
    position: relative;
    width: 100%;
    height: 100%;
    transition: transform 0.8s cubic-bezier(0.175, 0.885, 0.32, 1.275); /* Hafif yaylanma efekti */
    transform-style: preserve-3d;
}

.profile-flipper.flipped {
    transform: rotateY(180deg);
}

.profile-front, .profile-back {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    padding: 3rem;
    border-radius: 24px;
    backdrop-filter: blur(10px);
    box-shadow: 0 20px 40px -10px rgba(0,0,0,0.3);
    backface-visibility: hidden; /* Arka yüzü gizle */
    transform-style: preserve-3d;
}

.profile-front {
    transform: rotateY(0deg);
}

/* İçeriklerin karttan hafifçe ayrılması (Parallax) - Sadece ön yüzdekiler için */
.profile-front > * {
    transform: translateZ(20px);
}

body.panel-open .hub-container .profile-content {
    opacity: 0.4;
    filter: blur(10px);
    transform: scale(0.95);
    pointer-events: none;
}

/* Panel açıkken arka planın kaymasını tamamen kilitle */
body.panel-open {
    overflow: hidden;
}

.profile-back {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    transform: rotateY(180deg);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
}

/* --- WEATHER WIDGET --- */
.weather-widget {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: var(--glass-bg);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    border: 1px solid var(--glass-border);
    font-size: 0.9rem;
    color: var(--text-secondary);
    backdrop-filter: blur(5px);
    transition: all 0.3s;
    cursor: pointer;
    position: relative; /* Popup için */
    margin-left: 1rem; /* Dil butonlarından ayır */
}

.weather-widget:hover {
    background: var(--glass-bg);
    transform: translateY(-2px);
    border-color: var(--accent-color);
}

.weather-icon {
    font-size: 1.2rem;
    color: var(--accent-color);
}

/* --- WEATHER POPUP --- */
.weather-popup {
    position: absolute;
    top: 120%;
    left: 0;
    background: var(--panel-bg);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    padding: 1rem;
    min-width: 200px;
    backdrop-filter: blur(10px);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.3s ease;
    z-index: 100;
    box-shadow: 0 10px 25px rgba(0,0,0,0.5);
    cursor: default;
}

.weather-popup.active {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.forecast-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--glass-border);
}

.forecast-item:last-child {
    border-bottom: none;
}

.forecast-day { color: var(--text-primary); font-weight: 600; }
.forecast-icon { color: var(--accent-color); font-size: 1.1rem; }
.forecast-temp { color: var(--text-secondary); font-size: 0.85rem; }

.greeting {
    display: block;
    font-size: 1.5rem;
    font-weight: 500;
    color: var(--accent-color);
    margin-bottom: 0.5rem;
    opacity: 0;
    animation: fadeIn 1s ease forwards 0.5s; /* Hafif gecikmeli belirsin */
}

.name {
    font-size: 5rem; /* Daha büyük ve etkileyici */
    font-weight: 800;
    letter-spacing: -0.05em;
    background: linear-gradient(to bottom, #fff, #94a3b8);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 0.5rem;
}

.title {
    font-size: 1.5rem;
    font-weight: 300;
    color: var(--accent-color);
    margin-bottom: 1.5rem;
}

.intro {
    color: var(--text-secondary);
    line-height: 1.6;
    max-width: 500px;
    margin: 0 auto;
}

/* --- CTA BUTTON (İletişime Geç) --- */
.cta-btn {
    margin-top: 2.5rem;
    padding: 14px 36px;
    background: var(--accent-color);
    color: white;
    border: none;
    border-radius: 50px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    box-shadow: 0 4px 15px rgba(99, 102, 241, 0.3);
    opacity: 0;
    animation: fadeInUp 0.8s ease 2s forwards; /* 2 saniye gecikmeli gelir */
}

.cta-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(99, 102, 241, 0.5);
    background: #4f46e5;
}

.hub-footer {
    position: absolute;
    top: 2rem; /* Üste alındı */
    right: 2rem; /* Sağ tarafa yaslandı */
    display: flex;
    gap: 1.5rem;
    align-items: center;
    /* Modern Dock (Rıhtım) Stili */
    background: var(--glass-bg);
    padding: 1rem 2.5rem;
    border-radius: 2rem;
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(10px);
    box-shadow: 0 20px 40px -10px rgba(0,0,0,0.3);
    z-index: 50;
}

/* Dil Değiştirici */
.lang-switch {
    position: absolute;
    top: 2rem;
    left: 2rem;
    z-index: 50;
    display: flex;
    gap: 0.5rem;
    align-items: center;
}

.lang-btn {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    color: var(--text-secondary);
    padding: 8px 16px;
    border-radius: 20px;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.3s;
}

.lang-btn.active, .lang-btn:hover {
    background: var(--accent-color);
    color: white;
    border-color: var(--accent-color);
}

/* Tema Değiştirici Buton */
.theme-toggle {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    color: var(--text-secondary);
    padding: 8px;
    border-radius: 50%;
    cursor: pointer;
    transition: all 0.3s;
    display: flex;
    align-items: center;
    justify-content: center;
}

.theme-toggle:hover {
    color: var(--accent-color);
    border-color: var(--accent-color);
}

.social-link {
    color: var(--text-secondary);
    font-size: 1.5rem;
    transition: all 0.3s ease;
}

.social-link:hover {
    color: var(--text-primary);
    transform: translateY(-3px);
}

/* Sosyal Medya Marka Renkleri (Hover) */
.social-link:hover .ph-twitter-logo {
    color: #1DA1F2;
    filter: drop-shadow(0 0 8px rgba(29, 161, 242, 0.5));
}

.social-link:hover .ph-instagram-logo {
    color: #E1306C;
    filter: drop-shadow(0 0 8px rgba(225, 48, 108, 0.5));
}

.social-link:hover .ph-linkedin-logo {
    color: #0077b5;
    filter: drop-shadow(0 0 8px rgba(0, 119, 181, 0.5));
}

/* --- MOBİL MENÜ BUTONU --- */
.mobile-menu-toggle {
    display: none; /* Masaüstünde gizli */
    position: fixed;
    top: 2rem;
    right: 2rem;
    z-index: 300;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    color: white;
    padding: 10px;
    border-radius: 50%;
    cursor: pointer;
    backdrop-filter: blur(10px);
}

/* Panel açıkken mobil menü butonunu gizle (Çakışmayı önlemek için) */
body.panel-open .mobile-menu-toggle {
    display: none;
}

/* --- NAVİGASYON --- */
.bottom-nav {
    position: absolute;
    bottom: 3rem;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 1rem;
    z-index: 200;
}

.nav-btn {
    position: relative;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    color: var(--text-secondary);
    padding: 12px 24px;
    border-radius: 50px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 10px;
    backdrop-filter: blur(5px);
    transition: all 0.3s ease;
    z-index: 10;
    font-family: 'Inter', sans-serif;
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.1);
}

.nav-btn:hover {
    background: var(--glass-bg);
    color: var(--text-primary);
    border-color: var(--text-primary);
    box-shadow: 0 0 20px rgba(99, 102, 241, 0.3);
}

.nav-btn.active {
    background: var(--accent-color);
    color: white;
    border-color: var(--accent-color);
    box-shadow: 0 0 20px rgba(99, 102, 241, 0.4);
}

/* --- PANELLER --- */
.panel {
    position: fixed;
    inset: 0;
    height: 100dvh; /* Mobilde adres çubuğu sorununu çözer */
    background: var(--panel-bg);
    backdrop-filter: blur(15px);
    z-index: 100;
    display: flex;
    /* justify-content: center; ve align-items: center; kaldırıldı çünkü scroll engelliyor */
    overflow-y: auto; /* Scroll aktif */
    padding: 2rem 2rem 8rem 2rem; /* Alt navigasyonun içeriği kapatmaması için ekstra boşluk */
    visibility: hidden;
    opacity: 0;
    transition: transform var(--transition-speed) var(--ease), 
                opacity var(--transition-speed) var(--ease),
                visibility var(--transition-speed);
}

.panel.from-left { transform: translateX(-100%); }
.panel.from-right { transform: translateX(100%); }
.panel.from-top { transform: translateY(-100%); }
.panel.from-bottom { transform: translateY(100%); }

.panel.active {
    transform: none; /* Fixed elemanların viewport'a göre konumlanması için */
    opacity: 1;
    visibility: visible;
}

.panel-content {
    max-width: 1200px; /* Genişlik artırıldı */
    width: 100%;
    opacity: 0;
    margin: auto; /* Dikey ve yatay ortalama için (flex container içinde) */
    min-height: min-content; /* İçerik kısaysa ortada kalsın */
    transform: translateY(20px);
    transition: all 0.4s ease 0.2s;
}

.panel.active .panel-content {
    opacity: 1;
    transform: translateY(0);
}

.about-text p {
    margin-bottom: 1rem;
    line-height: 1.6;
}

/* --- CV İNDİR BUTONU --- */
.cv-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    margin-top: 1.5rem;
    padding: 10px 24px;
    background: transparent;
    border: 1px solid var(--accent-color);
    color: var(--accent-color);
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s;
}

.cv-btn:hover {
    background: var(--accent-color);
    color: white;
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(56, 189, 248, 0.3);
}

.close-btn {
    position: fixed; /* Mobilde kaybolmaması için fixed yapıldı */
    top: 2rem;
    right: 2rem;
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-size: 2rem;
    cursor: pointer;
    transition: transform 0.3s ease;
    z-index: 400; /* En üstte kalsın */
}

.close-btn:hover {
    transform: rotate(90deg);
    color: var(--accent-color);
}

/* --- İÇERİK --- */
h2 {
    font-size: 3rem;
    margin-bottom: 2rem;
    border-bottom: 1px solid var(--glass-border);
    padding-bottom: 1rem;
}

/* --- FİLTRE BUTONLARI --- */
.filter-container {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.filter-btn {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    color: var(--text-secondary);
    padding: 8px 20px;
    border-radius: 20px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.filter-btn.active, .filter-btn:hover {
    background: var(--accent-color);
    color: white;
    border-color: var(--accent-color);
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
}

/* Geniş ekranlarda 4 sütun göster */
@media (min-width: 1200px) {
    .grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

.card {
    background: var(--card-bg-gradient);
    padding: 1.5rem;
    border-radius: 12px;
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(5px);
    transition: all 0.3s;
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.card:hover {
    border-color: var(--accent-color);
    /* Hover background efekti için opacity değişimi veya benzeri bir şey yapılabilir, şimdilik border yeterli */
    transform: translateY(-5px);
    box-shadow: 0 10px 30px -10px rgba(99, 102, 241, 0.3);
}

.more-link {
    display: flex;
    align-items: center;
    gap: 5px;
    margin-top: 1rem;
    font-size: 0.85rem;
    color: var(--accent-color);
    font-weight: 600;
}

/* Proje Kartı Aksiyon Butonları */
.card-actions {
    display: flex;
    gap: 0.8rem;
    margin-top: 1rem;
}

.card-btn {
    padding: 6px 12px;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 6px;
    color: var(--text-secondary);
    transition: all 0.3s;
}

.card-btn:hover {
    background: var(--accent-color);
    color: white;
    border-color: var(--accent-color);
}

/* --- BLOG STYLES --- */
.blog-date {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
    display: block;
    font-family: monospace;
}

.blog-tags {
    display: flex;
    gap: 0.5rem;
    margin-top: 1rem;
}

.blog-tag {
    font-size: 0.75rem;
    padding: 2px 8px;
    background: var(--glass-bg);
    border-radius: 12px;
    color: var(--text-secondary);
}

/* Blog Share Buttons */
.blog-share {
    margin-top: 2rem;
    padding-top: 1rem;
    border-top: 1px solid var(--glass-border);
    display: flex;
    align-items: center;
    gap: 1rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.share-btn {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    color: var(--text-secondary);
    width: 36px;
    height: 36px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.3s;
    font-size: 1.2rem;
}

.share-btn:hover {
    transform: translateY(-2px);
    color: white;
}

.share-btn.twitter:hover {
    background: #1DA1F2;
    border-color: #1DA1F2;
}

.share-btn.linkedin:hover {
    background: #0077b5;
    border-color: #0077b5;
}

/* Blog Kart Animasyonu */
#blog .card {
    opacity: 0;
}

.panel.active#blog .card {
    animation: fadeInUp 0.5s ease forwards;
}

/* --- DENEYİM GRID YAPISI --- */
.experience-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 3rem;
}

@media (min-width: 768px) {
    .experience-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

.column-title {
    font-size: 1.2rem;
    color: var(--text-primary);
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    border-bottom: none; /* h2'den gelen border'ı kaldır */
}

.list li {
    list-style: none;
    padding: 1.5rem 0;
    border-bottom: 1px solid var(--glass-border);
}

/* Sertifikalar için Scroll */
.scrollable-list {
    max-height: 400px; /* Yükseklik sınırı */
    overflow-y: auto;
    padding-right: 0.5rem;
}

.scrollable-list::-webkit-scrollbar {
    width: 4px;
}
.scrollable-list::-webkit-scrollbar-track {
    background: var(--glass-bg);
}
.scrollable-list::-webkit-scrollbar-thumb {
    background: var(--accent-color);
    border-radius: 4px;
}

.list-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.5rem;
}

.date { font-size: 0.9rem; color: var(--text-secondary); font-family: monospace; }
.company { color: var(--accent-color); }

.tags { display: flex; gap: 1rem; margin-top: 1.5rem; }
.tags span {
    padding: 0.5rem 1rem;
    background: rgba(99, 102, 241, 0.1);
    color: var(--accent-color);
    border-radius: 6px;
    font-size: 0.9rem;
}

/* --- YETKİNLİKLER (SKILLS) --- */
.skills-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.skill-category h3 {
    font-size: 1.2rem;
    color: var(--text-primary);
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

/* Yeni Yetkinlik Etiketleri (Tag Cloud) */
.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.8rem;
}

.skill-tag {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    padding: 0.5rem 1rem;
    border-radius: 8px;
    font-size: 0.9rem;
    color: var(--text-secondary);
    transition: all 0.3s;
    position: relative; /* Tooltip için */
    opacity: 0; /* Animasyon için başlangıçta gizli */
}

.skill-tag:hover {
    border-color: var(--accent-color);
    color: white;
    background: rgba(99, 102, 241, 0.1);
    transform: translateY(-2px);
}

/* Panel aktif olduğunda etiket animasyonu başlasın */
.panel.active .skill-tag {
    animation: fadeInUpTag 0.5s ease forwards;
}

@keyframes fadeInUpTag {
    from { opacity: 0; transform: translateY(15px); }
    to { opacity: 1; transform: translateY(0); }
}

.skill-item {
    margin-bottom: 1.2rem;
}

.skill-info {
    display: flex;
    justify-content: space-between;
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.progress-bar {
    height: 6px;
    background: var(--glass-bg);
    border-radius: 3px;
    overflow: visible; /* Tooltip'in dışarı taşabilmesi için */
    position: relative;
}

.progress-fill {
    height: 100%;
    background: var(--accent-color);
    border-radius: 3px;
    width: 0; /* JS ile doldurulacak */
    transition: width 1s ease 0.5s;
}

/* --- TOOLTIP STYLES --- */
.progress-bar::after {
    content: attr(data-tooltip);
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%) translateY(-8px);
    background: var(--accent-color);
    color: white;
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 0.75rem;
    white-space: nowrap;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    pointer-events: none;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

.progress-bar::before {
    content: '';
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%) translateY(-4px);
    border: 4px solid transparent;
    border-top-color: var(--accent-color);
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    pointer-events: none;
}

.progress-bar:hover::after,
.progress-bar:hover::before {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(-12px); /* Hover'da hafif yukarı kayma */
}

/* Ok işareti için hover hareketi */
.progress-bar:hover::before {
    transform: translateX(-50%) translateY(-8px);
}

/* --- SKILL TAG TOOLTIP --- */
.skill-tag::after {
    content: attr(data-percent);
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%) translateY(5px);
    background: var(--accent-color);
    color: white;
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 0.75rem;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    pointer-events: none;
    white-space: nowrap;
    z-index: 10;
}

.skill-tag:hover::after {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(-5px);
}

/* Panel aktif olduğunda progress barlar dolsun */
.panel.active .progress-fill {
    /* Width JS ile set edilecek, bu sadece tetikleyici */
}

/* --- PROJE DETAY MODAL --- */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(5px);
    z-index: 200; /* Panelin üzerinde */
    display: flex;
    justify-content: center;
    align-items: center;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.modal-card {
    background: var(--panel-bg);
    padding: 2.5rem;
    border-radius: 16px;
    max-width: 500px;
    width: 90%;
    position: relative;
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(20px);
    transform: scale(0.9);
    transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
}

/* Blog Modalı için özel boyutlandırma */
.blog-modal-card {
    max-width: 700px;
    max-height: 80vh;
    overflow-y: auto;
}

.blog-content {
    color: var(--text-secondary);
    line-height: 1.8;
    font-size: 1rem;
}

/* Blog Meta (Tarih ve Okuma Süresi) */
.blog-meta {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
    font-size: 0.85rem;
    color: var(--text-secondary);
    font-family: monospace;
}

.blog-date { margin-bottom: 0; } /* Eski margin'i sıfırla */

.blog-dot { font-weight: bold; opacity: 0.5; }

.blog-read-time { color: var(--accent-color); }

.modal-overlay.active .modal-card {
    transform: scale(1);
}

.modal-close {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-size: 1.5rem;
    cursor: pointer;
}

.modal-close:hover { color: white; }

.modal-img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    border-radius: 8px;
    margin-bottom: 1.5rem;
    border: 1px solid var(--glass-border);
}

#modal-title { font-size: 1.8rem; margin-bottom: 0.5rem; color: white; }
#modal-tech { 
    display: inline-block; 
    font-size: 0.85rem; 
    color: var(--accent-color); 
    background: rgba(99, 102, 241, 0.1);
    padding: 4px 12px;
    border-radius: 20px;
    margin-bottom: 1.5rem;
}
#modal-desc { color: var(--text-secondary); line-height: 1.6; }

/* Responsive */
@media (max-width: 768px) {
    .name { font-size: 3rem; }
    h2 { font-size: 2rem; }
    .name { font-size: 2.5rem; }
    h2 { font-size: 1.8rem; }
    .cursor-glow { display: none; } /* Mobilde glow kapatılabilir */

    .hub-container {
        height: auto;
        min-height: 100dvh; /* Mobilde tam ekran */
        padding-bottom: 8rem; /* Alt navigasyon ve footer için boşluk */
        overflow-x: hidden;
    }
    
    .profile-front, .profile-back {
        padding: 2rem 1.5rem;
    }

    .panel { padding: 5rem 1.5rem 3rem 1.5rem; }

    /* Mobil Menü Aktifleşince */
    .mobile-menu-toggle {
        display: block;
    }

    .bottom-nav {
        display: none; /* Varsayılan olarak gizle */
        flex-direction: column;
        position: fixed;
        inset: 0;
        height: 100dvh; /* Menü tam ekran */
        transform: none;
        background: rgba(15, 23, 42, 0.95);
        justify-content: center;
        align-items: center;
        gap: 1.5rem;
        z-index: 250;
        backdrop-filter: blur(20px);
        /* Hafif gradyan ekleyerek derinlik katalım */
        background: radial-gradient(circle at center, rgba(15, 23, 42, 0.95) 0%, rgba(2, 6, 23, 0.98) 100%);
    }

    .bottom-nav.mobile-active {
        display: flex;
        animation: fadeIn 0.3s ease;
    }
    
    /* Menü elemanları için sıralı giriş animasyonu */
    .bottom-nav.mobile-active .nav-btn {
        opacity: 0;
        animation: fadeInUp 0.5s ease forwards;
    }
    .bottom-nav.mobile-active .nav-btn:nth-child(1) { animation-delay: 0.1s; }
    .bottom-nav.mobile-active .nav-btn:nth-child(2) { animation-delay: 0.2s; }
    .bottom-nav.mobile-active .nav-btn:nth-child(3) { animation-delay: 0.3s; }
    .bottom-nav.mobile-active .nav-btn:nth-child(4) { animation-delay: 0.4s; }

    .nav-btn {
        width: 75%;
        justify-content: center;
        padding: 1.2rem;
        font-size: 1.1rem;
        border-radius: 16px;
        background: rgba(255, 255, 255, 0.03);
        border: 1px solid rgba(255, 255, 255, 0.08);
        letter-spacing: 1px;
        font-weight: 600;
        box-shadow: 0 4px 20px rgba(0,0,0,0.2);
    }

    .nav-btn:active {
        transform: scale(0.98);
        background: var(--accent-color);
        color: white;
    }

    /* Mobilde Hub Footer'ı aşağı al (Hamburger ile çakışmasın) */
    .hub-footer {
        top: auto;
        bottom: 2rem;
        right: 50%;
        transform: translateX(50%);
        width: max-content;
    }
    
    .modal-card {
        padding: 1.5rem;
        width: 95%;
    }

    /* Mobilde CV butonu ortalansın */
    .about-text + .cv-btn {
        display: flex;
        justify-content: center;
        margin-left: auto;
        margin-right: auto;
        width: fit-content;
    }

    /* Mobilde Grid Yapılarını Tek Sütuna Düşür */
    .grid, .skills-container {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .name { font-size: 2rem; }
    .title { font-size: 1rem; margin-bottom: 1rem; }
    .intro { font-size: 0.9rem; }
    .hub-footer { width: 90%; gap: 1rem; padding: 0.8rem; justify-content: center; }
    .social-link { font-size: 1.3rem; }
    .filter-btn { padding: 6px 12px; font-size: 0.8rem; }
    .lang-switch { top: 1.5rem; left: 1.5rem; }

    /* Çok küçük ekranlar için profil kartı ayarları */
    .profile-front, .profile-back {
        padding: 1.5rem 1rem;
    }

    /* Hava durumu popup'ını ekrana ortala */
    .weather-popup {
        left: 50%;
        transform: translateX(-50%) translateY(-10px);
        width: 280px;
    }

    .weather-popup.active {
        transform: translateX(-50%) translateY(0);
    }
}

/* --- E-POSTA KOPYALAMA --- */
.email {
    cursor: pointer;
    transition: color 0.3s;
    position: relative;
    display: inline-block;
}

.email:hover {
    color: var(--accent-color);
}

.email::after {
    content: 'Kopyalandı!';
    position: absolute;
    top: -2rem;
    left: 50%;
    transform: translateX(-50%);
    background: var(--accent-color);
    color: white;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.8rem;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s;
    pointer-events: none;
}

.email.copied::after {
    opacity: 1;
    visibility: visible;
    top: -2.5rem;
}

/* --- İLETİŞİM FORMU --- */
.contact-container {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
}

@media (min-width: 768px) {
    .contact-container {
        grid-template-columns: 1fr 1.5fr; /* Bilgi solda, Form sağda */
        align-items: start;
    }
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
    align-items: flex-start;
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

/* Textarea Wrapper & Counter */
.textarea-wrapper {
    position: relative;
    width: 100%;
}

.char-count {
    position: absolute;
    bottom: 0.5rem;
    right: 0.5rem;
    font-size: 0.75rem;
    color: var(--text-secondary);
    pointer-events: none;
}

.contact-form input,
.contact-form textarea {
    width: 100%;
    padding: 1rem;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 8px;
    color: white;
    font-family: 'Inter', sans-serif;
    transition: all 0.3s;
}

.contact-form input:focus,
.contact-form textarea:focus {
    outline: none;
    border-color: var(--accent-color);
    background: var(--glass-bg);
}

.submit-btn {
    padding: 1rem 2rem;
    background: var(--accent-color);
    color: white;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    transition: all 0.3s;
}

.submit-btn:hover {
    background: #4f46e5;
    transform: translateY(-2px);
}

/* Form Loading State */
.submit-btn .spinner {
    display: none;
    width: 20px;
    height: 20px;
    border: 2px solid rgba(255,255,255,0.3);
    border-radius: 50%;
    border-top-color: white;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.submit-btn.loading .btn-text { display: none; }
.submit-btn.loading .spinner { display: block; }
.submit-btn.loading { pointer-events: none; opacity: 0.8; }

.submit-btn.success {
    background-color: #10b981; /* Yeşil */
    pointer-events: none;
}

/* --- SCROLL PROGRESS INDICATOR --- */
.scroll-progress-container {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    z-index: 150;
    width: 50px;
    height: 50px;
    display: flex;
    justify-content: center;
    align-items: center;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    cursor: pointer;
}

/* Sadece panel açıkken göster */
body.panel-open .scroll-progress-container, .scroll-progress-container.visible {
    opacity: 1;
    visibility: visible;
}

.progress-ring__circle {
    stroke: var(--accent-color);
    transition: stroke-dashoffset 0.1s;
    transform: rotate(-90deg);
    transform-origin: 50% 50%;
    stroke-dasharray: 126; /* 2 * PI * r (r=20) ≈ 125.6 */
    stroke-dashoffset: 126;
}

.scroll-icon {
    position: absolute;
    color: var(--accent-color);
    font-size: 1.2rem;
    transition: transform 0.3s;
}

.scroll-progress-container:hover .scroll-icon {
    transform: translateY(-3px);
}

@media (max-width: 768px) {
    .scroll-progress-container {
        bottom: 2rem;
        right: 2rem;
    }
}

@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeIn {
    from { opacity: 0; } to { opacity: 1; }
}