/* ===== KÖK DEĞİŞKENLER (Yeni Renk Paleti) ===== */
:root {
    /* Renk Paleti: Kurşun Grisi + Canlı Mor */
    --bg-main: #1A1D24;         /* Ana Zemin (Kömür) */
    --bg-card: #232730;         /* Kart & Header (Kurşun) */
    --text-primary: #F0F4F8;     /* Ana Metin (Kırık Beyaz) */
    --text-secondary: #A0AEC0;    /* İkincil Metin (Gri) */
    --accent-color: #8B5CF6;      /* Vurgu Rengi (Mor-500) */
    --accent-color-dark: #7C3AED;  /* Vurgu Rengi Hover (Mor-600) */
    --border-color: rgba(255, 255, 255, 0.1); /* İnce Çizgi */
    
    --font-main: 'Inter', sans-serif;
    --font-mono: 'Roboto Mono', monospace;
    
    /* Modern Efektler */
    --card-border-radius: 12px;
    --button-border-radius: 8px;
    --accent-glow: 0 4px 20px rgba(139, 92, 246, 0.25);
    --header-height: 70px;
    
    /* WhatsApp rengi */
    --whatsapp-color: #25D366; 
    --whatsapp-shadow: 0 6px 15px rgba(37, 211, 102, 0.4);

    /* YENİ: Premium Aydınlatma */
    --premium-border-color: rgba(139, 92, 246, 0.6);
    --premium-shadow: 0 0 15px rgba(139, 92, 246, 0.4);
}

/* ===== TEMEL STİLLER ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    background-color: var(--bg-main);
}

body {
    font-family: var(--font-main);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden; /* Yatay kaydırmayı engelle */
}

/* ===== ÖZEL KAYDIRMA ÇUBUĞU ===== */
::-webkit-scrollbar {
    width: 8px;
}
::-webkit-scrollbar-track {
    background: var(--bg-main);
}
::-webkit-scrollbar-thumb {
    background: var(--accent-color);
    border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
    background: var(--accent-color-dark);
}

img {
    max-width: 100%;
    height: auto;
}

a {
    text-decoration: none;
    color: var(--accent-color);
    transition: color 0.3s ease;
}
a:hover {
    color: var(--accent-color-dark);
}

ul {
    list-style: none;
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 2rem;
}

section {
    padding: 6rem 0;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 900;
    text-align: center;
    margin-bottom: 3.5rem;
    color: #fff;
}

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

.subtitle {
    font-family: var(--font-mono);
    color: var(--accent-color);
    font-size: 1.1rem;
    display: block;
    margin-bottom: 1rem;
    letter-spacing: 1px;
}

/* ===== HEADER & NAVİGASYON ===== */
#main-header {
    position: sticky;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--header-height);
    z-index: 100;
    /* Cam Efekti (Glassmorphism) */
    background: rgba(35, 39, 48, 0.7); /* --bg-card %70 alpha */
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    transition: box-shadow 0.3s ease, background-color 0.3s ease;
}

/* Kaydırma sonrası header'a gölge ekle */
#main-header.scrolled {
    background: rgba(35, 39, 48, 0.85);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

#main-header nav.container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 100%;
}

.logo {
    font-size: 1.8rem;
    font-weight: 900;
    color: #fff;
    transition: color 0.3s ease;
}
.logo:hover {
    color: var(--text-primary);
}

.nav-links {
    display: none; 
    align-items: center;
    gap: 1.5rem;
}

.nav-links li:last-child {
    /* CV İndir butonunu diğer linklerden ayırmak için */
    margin-left: 0.5rem; 
}

.nav-links a {
    color: var(--text-secondary);
    font-weight: 500;
    padding: 0.5rem;
    position: relative;
    transition: color 0.3s ease;
}
.nav-links a:hover {
    color: var(--text-primary);
}

/* Link altı çizgisi */
.nav-links a:not(.cta-button)::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 2px;
    background: var(--accent-color);
    transition: width 0.3s ease;
}
.nav-links a:not(.cta-button):hover::after {
    width: 100%;
}

/* ===== CTA BUTON (Genel) ===== */
.cta-button {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border-radius: var(--button-border-radius);
    font-weight: 700;
    text-align: center;
    transition: all 0.3s ease;
    border: 2px solid transparent;
}

.cta-button.primary {
    background: var(--accent-color);
    color: #fff;
    border-color: var(--accent-color);
}
.cta-button.primary:hover {
    background: var(--accent-color-dark);
    border-color: var(--accent-color-dark);
    transform: scale(1.05);
    box-shadow: var(--accent-glow);
}

.cta-button.secondary {
    background: transparent;
    color: var(--text-primary);
    border: 2px solid var(--border-color);
}
.cta-button.secondary:hover {
    border-color: var(--accent-color);
    color: var(--accent-color);
    background: rgba(139, 92, 246, 0.1);
}

/* Header'daki küçük CV butonu için stil */
.cta-button.secondary.small-cta {
    padding: 0.5rem 1rem;
    font-size: 0.9rem;
    border-color: var(--accent-color); /* Vurgu rengi ile daha belirgin */
    color: var(--accent-color);
}
.cta-button.secondary.small-cta:hover {
    background: rgba(139, 92, 246, 0.1);
}


/* ===== MOBİL MENÜ BUTONU ===== */
#hamburger-btn {
    display: block; 
    width: 30px;
    height: 22px;
    position: relative;
    background: none;
    border: none;
    cursor: pointer;
    z-index: 101;
    transform: rotate(0deg);
    transition: .5s ease-in-out;
}
#hamburger-btn .bar {
    display: block;
    position: absolute;
    height: 3px;
    width: 100%;
    background: var(--text-primary);
    border-radius: 3px;
    opacity: 1;
    left: 0;
    transform: rotate(0deg);
    transition: .25s ease-in-out;
}
#hamburger-btn .bar:nth-child(1) { top: 0px; }
#hamburger-btn .bar:nth-child(2) { top: 9px; }
#hamburger-btn .bar:nth-child(3) { top: 18px; }

/* Menü açıkken */
#main-header.menu-open #hamburger-btn .bar:nth-child(1) {
    top: 9px;
    transform: rotate(135deg);
}
#main-header.menu-open #hamburger-btn .bar:nth-child(2) {
    opacity: 0;
    left: -30px;
}
#main-header.menu-open #hamburger-btn .bar:nth-child(3) {
    top: 9px;
    transform: rotate(-135deg);
}

/* ===== MOBİL MENÜ ===== */
#mobile-menu {
    position: fixed;
    top: var(--header-height); 
    right: 0;
    width: 100%;
    height: calc(100vh - var(--header-height)); 
    background: rgba(35, 39, 48, 0.95);
    backdrop-filter: blur(5px);
    z-index: 99; 
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 2rem;
    
    transform: translateX(100%);
    transition: transform 0.4s cubic-bezier(0.23, 1, 0.32, 1);
}

#mobile-menu.active {
    transform: translateX(0);
}

#mobile-menu ul {
    text-align: center;
}
#mobile-menu li {
    margin-bottom: 2rem;
}
#mobile-menu a {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--text-primary);
}
#mobile-menu a:hover {
    color: var(--accent-color);
}
#mobile-menu .cta-button.primary {
    /* Mobil menüdeki CV butonu için farklı stil */
    margin-top: 1rem;
    padding: 1rem 2rem;
}


/* ===== HERO SECTION ===== */
#hero {
    min-height: calc(100vh - var(--header-height));
    display: flex;
    align-items: center;
    text-align: center;
    justify-content: center;
}

.hero-content h1 {
    font-size: 3rem;
    font-weight: 900;
    color: #fff;
    line-height: 1.2;
    margin-bottom: 1.5rem;
    min-height: 80px; 
}

.hero-content p {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto 2.5rem auto;
}

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

/* Yazı Efekti İmleci */
.typing-cursor {
    display: inline-block;
    width: 3px;
    height: 1.1em;
    background-color: var(--accent-color);
    animation: blink 0.7s infinite;
    margin-left: 4px;
    vertical-align: text-bottom;
}
@keyframes blink {
    0%, 100% { opacity: 1; }
    50% { opacity: 0; }
}

/* ===== YENİ: NEDEN EGNAKE BÖLÜMÜ STİLİ ===== */
#why-me {
    padding-top: 3rem;
    padding-bottom: 3rem;
    /* Hafif bir ayırıcı */
    border-top: 1px solid var(--border-color); 
    border-bottom: 1px solid var(--border-color);
}
.why-me-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
    text-align: center;
}
.why-me-card {
    padding: 1.5rem;
    border-radius: var(--card-border-radius);
    background: var(--bg-card);
    transition: all 0.3s ease;
    border: 1px solid var(--border-color);
}

.why-me-card:hover {
    /* Hafif hover etkisi */
    background: rgba(139, 92, 246, 0.05);
}

.why-me-card h3 {
    color: #fff;
    font-size: 1.2rem;
    margin-bottom: 0.75rem;
}
.why-me-card p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}
.why-me-card .icon-purple {
    font-size: 2.5rem;
    color: var(--accent-color);
    margin-bottom: 1rem;
}


/* ===== HAKKIMDA SECTION ===== */
#about.container {
    display: flex;
    flex-direction: column-reverse; 
    gap: 3rem;
    align-items: center;
}

.about-content {
    flex: 2;
    text-align: center;
}
.about-content .section-title {
    text-align: center;
}
.about-content p {
    color: var(--text-secondary);
    margin-bottom: 1rem;
    font-size: 1.05rem;
}

.about-photo-wrapper {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
    width: 300px;
    height: 300px;
}
/* Fotoğrafın etrafındaki "nefes alma" efekti */
.about-photo-wrapper::before {
    content: '';
    position: absolute;
    width: 100%;
    height: 100%;
    border-radius: 50%;
    background: transparent; 
    border: 2px solid var(--accent-color);
    animation: pulse-glow 4s ease-in-out infinite;
    z-index: 5;
}
.about-photo-wrapper::after {
    content: '';
    position: absolute;
    width: 95%;
    height: 95%;
    background: var(--bg-main);
    border-radius: 50%;
    z-index: 6;
}

/* 'Nefes alma' (pulse) animasyonu */
@keyframes pulse-glow {
    0% {
        transform: scale(0.95);
        opacity: 0.3;
        box-shadow: 0 0 10px 0px var(--accent-color);
    }
    50% {
        transform: scale(1.02);
        opacity: 0.7;
        box-shadow: 0 0 30px 5px var(--accent-color);
    }
    100% {
        transform: scale(0.95);
        opacity: 0.3;
        box-shadow: 0 0 10px 0px var(--accent-color);
    }
}


.about-photo, #photo-placeholder {
    width: 280px;
    height: 280px;
    border-radius: 50%;
    object-fit: cover;
    z-index: 10;
    border: 5px solid var(--bg-card);
}
#photo-placeholder {
    background: var(--bg-card);
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 5rem;
    color: var(--text-secondary);
}

/* ===== HİZMETLER SECTION (GÜNCELLENDİ: Premium Efekt) ===== */
.services-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
}

.service-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--card-border-radius);
    padding: 2.5rem 2rem;
    text-align: center;
    transition: all 0.3s ease;
    /* YENİ: Başlangıç gölgesi */
    box-shadow: 0 0 0 0 rgba(139, 92, 246, 0); 
}
.service-card:hover {
    transform: translateY(-8px);
    /* YENİ: Mor sınır ve parıltılı gölge */
    border-color: var(--premium-border-color); 
    box-shadow: var(--premium-shadow);
    /* Ekstra animasyon için border-color geçişi */
    transition: all 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}
.service-icon {
    font-size: 3rem;
    color: var(--accent-color);
    margin-bottom: 1.5rem;
}
.service-card h3 {
    font-size: 1.4rem;
    font-weight: 700;
    color: #fff;
    margin-bottom: 1rem;
}
.service-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}


/* ===== YETENEKLER SECTION ===== */
.skills-container {
    display: grid;
    grid-template-columns: 1fr;
    gap: 3rem;
    max-width: 900px;
    margin: 0 auto;
}

.skill-category h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    color: #fff;
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 0.5rem;
}
.skill-category h3 i {
    margin-right: 0.5rem;
}

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

.skill-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    padding: 0.75rem 1.25rem;
    border-radius: var(--button-border-radius);
    font-family: var(--font-mono);
    font-weight: 500;
    color: var(--text-primary);
    transition: all 0.3s ease;
}
.skill-card:hover {
    transform: translateY(-3px);
    border-color: var(--accent-color);
    color: var(--accent-color);
    box-shadow: 0 4px 10px rgba(139, 92, 246, 0.1);
}

/* ===== PROJELER SECTION (GÜNCELLENDİ: Premium Efekt) ===== */
#project-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
}

/* Yükleyici Animasyonu */
#project-loader {
    text-align: center;
    padding: 3rem 0;
    color: var(--text-secondary);
}
.loader {
    width: 48px;
    height: 48px;
    border: 3px solid var(--text-primary);
    border-bottom-color: var(--accent-color);
    border-radius: 50%;
    display: inline-block;
    animation: rotation 1s linear infinite;
    margin-bottom: 1rem;
}
@keyframes rotation {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}
.error-msg {
    color: #ff6b6b;
    text-align: center;
    font-size: 1.1rem;
}

/* Proje Kartı (JS ile oluşturulacak) */
.project-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--card-border-radius);
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    transition: all 0.3s ease;
    /* YENİ: Başlangıç gölgesi */
    box-shadow: 0 0 0 0 rgba(139, 92, 246, 0); 
}
.project-card:hover {
    transform: translateY(-8px);
    /* YENİ: Mor sınır ve parıltılı gölge */
    border-color: var(--premium-border-color); 
    box-shadow: var(--premium-shadow);
    /* Ekstra animasyon için border-color geçişi */
    transition: all 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.project-card .card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}
.project-card .folder-icon {
    font-size: 2rem;
    color: var(--accent-color);
    opacity: 0.8;
}
.project-card .project-links {
    display: flex;
    gap: 1rem;
}
.project-card .project-links a {
    font-size: 1.25rem;
    color: var(--text-secondary);
    transition: color 0.3s ease;
}
.project-card .project-links a:hover {
    color: var(--accent-color);
}

.project-card .project-title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
}
.project-card .project-title a {
    color: #fff; 
    transition: color 0.3s ease;
}
.project-card:hover .project-title a {
    color: var(--accent-color);
}

.project-description {
    color: var(--text-secondary);
    font-size: 0.95rem;
    flex-grow: 1; 
    margin-bottom: 1.5rem;
    line-height: 1.5;
}

.card-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-family: var(--font-mono);
    font-size: 0.9rem;
    color: var(--text-secondary);
    border-top: 1px solid var(--border-color);
    padding-top: 1rem;
}
.project-language {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}
.project-language i {
    font-size: 0.7rem;
}
.project-stats {
    display: flex;
    gap: 1rem;
}
.project-stats span {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

/* ===== İLETİŞİM SECTION ===== */
#contact {
    background: transparent;
    border-top: none;
    border-bottom: none;
}
.contact-content {
    max-width: 700px; 
    margin: 0 auto;
    text-align: center;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--card-border-radius); 
    padding: 3rem 2rem; 
    transition: all 0.3s ease;
    /* YENİ: Başlangıç gölgesi */
    box-shadow: 0 0 0 0 rgba(139, 92, 246, 0); 
}

/* YENİ: Kart için hover efekti */
.contact-content:hover {
    transform: translateY(-8px);
    /* YENİ: Mor sınır ve parıltılı gölge */
    border-color: var(--premium-border-color); 
    box-shadow: var(--premium-shadow);
    transition: all 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.contact-content h2 {
    font-size: 2.5rem;
    font-weight: 900;
    color: #fff;
    margin-bottom: 1rem;
}
.contact-content p {
    color: var(--text-secondary);
    font-size: 1.1rem;
    margin-bottom: 2.5rem;
}
.contact-content .cta-button {
    font-size: 1.1rem;
    padding: 0.9rem 1.8rem;
}
.social-links {
    margin-top: 3.5rem;
    display: flex;
    justify-content: center;
    gap: 2.5rem;
}
.social-links a {
    font-size: 2.2rem;
    color: var(--text-secondary);
    transition: all 0.3s ease;
}
.social-links a:hover {
    color: var(--accent-color);
    transform: scale(1.2);
}

/* ===== FOOTER ===== */
footer {
    padding: 2.5rem 0;
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.9rem;
}
footer p:last-child {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    margin-top: 0.5rem;
    color: var(--text-secondary);
    opacity: 0.7;
}

/* ===== WHATSAPP BUTONU STİLİ ===== */
#whatsapp-btn {
    position: fixed;
    bottom: 25px;
    left: 25px; 
    z-index: 1000;
    background: var(--whatsapp-color);
    color: white;
    width: 60px;
    height: 60px;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 1.8rem;
    box-shadow: 0 6px 15px rgba(0, 0, 0, 0.3);
    cursor: pointer;
    transition: all 0.3s ease;
    transform: scale(1);
}

#whatsapp-btn:hover {
    background: #128C7E; 
    transform: scale(1.1);
    box-shadow: var(--whatsapp-shadow);
}

#whatsapp-btn::after {
    content: '';
    position: absolute;
    width: 100%;
    height: 100%;
    background: var(--whatsapp-color);
    border-radius: 50%;
    z-index: -1;
    opacity: 0;
    animation: whatsapp-pulse 2s infinite;
}

@keyframes whatsapp-pulse {
    0% {
        transform: scale(1);
        opacity: 0.5;
    }
    100% {
        transform: scale(1.5);
        opacity: 0;
    }
}


/* ===== KAYDIRMA ANİMASYONU ===== */
.animate-on-scroll {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}
.animate-on-scroll.delay-1 { transition-delay: 100ms; }
.animate-on-scroll.delay-2 { transition-delay: 200ms; }
.animate-on-scroll.delay-3 { transition-delay: 300ms; }

.animate-on-scroll.is-visible {
    opacity: 1;
    transform: translateY(0);
}


/* ===== RESPONSIVE TASARIM (Media Queries) ===== */

/* Tablet (768px ve üstü) */
@media (min-width: 768px) {
    .nav-links {
        display: flex;
    }
    #hamburger-btn {
        display: none;
    }

    .hero-content h1 {
        font-size: 4rem;
        min-height: 100px;
    }

    /* Neden Egnake? Grid düzeni */
    .why-me-grid {
        grid-template-columns: 1fr 1fr 1fr;
    }

    #about.container {
        flex-direction: row; 
        gap: 4rem;
    }
    .about-content {
        text-align: left;
    }
    .about-content .section-title {
        text-align: left;
    }
    
    .services-grid {
        grid-template-columns: 1fr 1fr;
    }

    .skills-container {
        grid-template-columns: 1fr 1fr;
    }

    #project-grid {
        grid-template-columns: 1fr 1fr;
    }
    
    .contact-content {
        padding: 4rem 3rem;
    }

    /* WhatsApp Butonunu Büyüt */
    #whatsapp-btn {
        width: 70px;
        height: 70px;
        font-size: 2.2rem;
        bottom: 30px;
        left: 30px;
    }
}

/* Desktop (1024px ve üstü) */
@media (min-width: 1024px) {
    .services-grid {
        grid-template-columns: 1fr 1fr 1fr;
    }

    #project-grid {
        grid-template-columns: 1fr 1fr 1fr;
    }

    .hero-content h1 {
        font-size: 4.5rem;
    }
}