:root {
    --bg-color: #0c0c0f;
    --primary-color: #ffffff;
    --accent-color: #9f78ff;
    --glass-bg: transparent;
    --glass-border: var(--accent-color);
    --glow-color: rgba(159, 120, 255, 0.7);
    --text-color: #c4c4c4;
    --font-family: 'Poppins', sans-serif;
}

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

html {
    scroll-behavior: smooth;
}

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: var(--font-family);
    line-height: 1.7;
    overflow-x: hidden;
}

#canvas-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    opacity: 0.6; /* Biraz daha belirgin hale getirelim */
}

header {
    position: fixed;
    width: 100%;
    top: 0;
    left: 0;
    padding: 1.5rem 4rem;
    /* PERFORMANS OPTİMİZASYONU: 'blur' efekti kaldırıldı. */
    background: rgba(12, 12, 15, 0.85); /* Saydamlık azaltıldı, opaklık artırıldı. */
    border: none;
    box-shadow: none;
    z-index: 1000;
    display: flex;
    justify-content: center;
    align-items: center;
}

@media (max-width: 768px) {
    header {
        padding: 1rem 0.5rem;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        scrollbar-width: none; /* Firefox */
    }
    
    header::-webkit-scrollbar {
        display: none; /* Chrome, Safari, Edge */
    }
}

nav {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 100%;
}

nav a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.9rem;
    padding: 0.5rem 1.5rem;
    transition: color 0.3s, text-shadow 0.3s;
    position: relative;
    white-space: nowrap;
}

@media (max-width: 768px) {
    nav {
        display: flex;
        justify-content: flex-start;
        width: 100%;
        padding: 0 0.5rem;
        scroll-snap-type: x mandatory;
    }
    
    nav a {
        padding: 0.5rem 1rem;
        font-size: 0.8rem;
        scroll-snap-align: center;
        flex: 0 0 auto;
    }
    
    nav a.active-nav-link {
        scroll-snap-align: center;
    }
}

nav a::after {
    content: '';
    position: absolute;
    width: 80%;
    height: 2px;
    bottom: -5px;
    left: 10%;
    background-color: var(--accent-color);
    transform: scaleX(0);
    transform-origin: center;
    transition: transform 0.3s ease-out;
}

/* Aktif linkin stili her zaman böyledir */
.active-nav-link {
    color: var(--accent-color);
    text-shadow: 0 0 10px var(--glow-color);
}

/* Hover efekti sadece fare gibi hassas işaretçisi olan cihazlarda çalışır */
@media (hover: hover) and (pointer: fine) {
    nav a:hover {
        color: var(--accent-color);
        text-shadow: 0 0 10px var(--glow-color);
    }
}

.active-nav-link::after {
    transform: scaleX(1);
}

main {
    width: 100%;
}

section {
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 8rem 4rem;
    position: relative;
    overflow: hidden;
    perspective: 1000px; /* Add 3D space for children */
}

@media (max-width: 768px) {
    section {
        padding: 6rem 1.5rem;
        min-height: 90vh;
    }
}

.section-title {
    font-family: 'Cinzel', serif;
    font-size: 3.5rem;
    font-weight: 700;
    color: #e0e0e0;
    margin-bottom: 4rem;
    letter-spacing: 3px;
    text-align: center;
    transform: rotateX(25deg);
    animation: text-breathing 3s ease-in-out infinite;
    text-shadow: 
        0 0 10px var(--glow-color),
        0 0 20px var(--glow-color),
        0 0 30px var(--accent-color),
        0px 2px 2px rgba(0,0,0,0.5);
}

@media (max-width: 768px) {
    .section-title {
        font-size: 2.5rem;
        margin-bottom: 2.5rem;
        letter-spacing: 2px;
    }
}

#hero {
    flex-direction: column;
    text-align: center;
}

.hero-intro {
    font-size: 1.5rem;
    font-weight: 300;
    color: var(--primary-color);
}

#hero .hero-content {
    perspective: 800px; /* Enable 3D space for children */
}

h1 {
    font-family: 'Cinzel', serif;
    font-size: 5rem; /* Slightly larger for the new font */
    font-weight: 700;
    color: #e0e0e0; /* Start with a bright base color */
    margin: 0.5rem 0;
    letter-spacing: 4px;
    position: relative;
    transform: rotateX(25deg) rotateY(0deg); /* Tilt the text back */
    transform-style: preserve-3d; /* Ensure children maintain 3D position */
    animation: text-breathing 3s ease-in-out infinite;
    text-shadow: 
        0 0 10px var(--glow-color),
        0 0 20px var(--glow-color),
        0 0 30px var(--accent-color),
        0px 2px 2px rgba(0,0,0,0.5);
}

@media (max-width: 768px) {
    h1 {
        font-size: 2.8rem;
        letter-spacing: 2px;
        margin: 0.3rem 0;
    }
    
    .hero-intro {
        font-size: 1.2rem;
    }
    
    #hero h2 {
        font-size: 1.5rem;
    }
}

#hero h2 {
    font-family: 'Poppins', sans-serif; /* Keep sub-header font */
    font-size: 2rem;
    font-weight: 600;
    color: #e0e0e0;
    text-shadow: 
        0 0 10px var(--glow-color),
        0 0 20px var(--glow-color),
        0 0 30px var(--accent-color),
        0px 2px 2px rgba(0,0,0,0.5);
    transform: rotateX(25deg) rotateY(0deg); /* Match the tilt */
}

.typed-cursor {
    color: var(--accent-color);
    opacity: 1;
    animation: typedjsBlink 0.7s infinite;
}
@keyframes typedjsBlink {
  50% { opacity: 0.0; }
}

/* More performant breathing animation using opacity, which is GPU-accelerated */
@keyframes text-breathing {
  0% {
    opacity: 0.9; /* Raised to prevent getting too dim */
  }
  50% {
    opacity: 1;
  }
  100% {
    opacity: 0.9; /* Raised to prevent getting too dim */
  }
}

#about .section-container {
    max-width: 900px;
}
.about-content {
    background: rgba(0, 0, 0, 0.4); /* Okunabilirlik için koyu filmli cam efekti */
    border-left: 3px solid var(--accent-color); /* Vurgu çizgisi */
    border-top: none;
    border-right: none;
    border-bottom: none;
    padding: 2.5rem; /* İçerik için uygun boşluk */
    border-radius: 10px; /* Diğer kartlarla aynı köşe yuvarlaklığı */
    text-align: left; /* Metni sola hizala */
    transition: transform 0.3s ease, background 0.3s ease, border-color 0.3s ease, opacity 0.6s ease;
    box-shadow: none; /* Gölge kaldırıldı */
    /* Animasyon kaldırıldı - temiz görünüm */
    opacity: 1;
    transform: none;
}

.about-content p {
    font-size: 1.2rem;
    color: #ffffff; /* Brighter text for better contrast */
    margin-bottom: 1.5rem;
    line-height: 1.8;
    text-shadow: 0 0 5px rgba(0, 0, 0, 0.5); /* Text shadow for better readability */
}
.about-content p:last-child {
    margin-bottom: 0;
}
.about-content strong {
    color: var(--accent-color);
    font-weight: 600;
}

.about-content:hover {
    transform: translateY(-8px); /* Diğer kartlarla aynı hover efekti */
    background: rgba(0, 0, 0, 0.6); /* Hover'da daha koyu */
    box-shadow: none;
}

#projects {
    flex-direction: column;
}

.project-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2rem;
    max-width: 1200px;
    width: 100%;
}

@media (max-width: 768px) {
    .about-content {
        padding: 1rem;
    }

    .project-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .project-card {
        padding: 1.8rem;
    }
    
    .project-card h3 {
        font-size: 1.3rem;
    }
}

/* Proje kartları, deneyim kartları ile aynı stile sahip olacak şekilde güncellendi */
.project-card {
    background: rgba(0, 0, 0, 0.4); /* Okunabilirlik için koyu filmli cam efekti */
    padding: 2rem;
    border-radius: 10px;
    border-bottom: 3px solid var(--accent-color); /* Vurgu çizgisi alta taşındı */
    transition: transform 0.3s ease, background 0.3s ease, border-color 0.3s ease, opacity 0.6s ease; /* Renk geçişi için eklendi */
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    box-shadow: none; /* Gölge kaldırıldı */
    border-left: none;
    border-right: none;
    border-top: none;
    /* Animasyon kaldırıldı - temiz görünüm */
    opacity: 1;
    transform: none;
}

.project-card:hover {
    transform: translateY(-8px); /* Hafifçe yukarı kalkma efekti */
    background: rgba(0, 0, 0, 0.6); /* Hover'da daha koyu */
    box-shadow: none; /* Hover'da da gölge olmamasını sağla */
    will-change: auto;
}

.project-card h3 {
    font-size: 1.5rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
    text-shadow: 0 0 5px rgba(0, 0, 0, 0.5); /* Text shadow for better readability */
}

.project-card p {
    flex-grow: 1;
    margin-bottom: 2rem;
    color: #ffffff; /* Brighter text for better contrast */
    text-shadow: 0 0 5px rgba(0, 0, 0, 0.5); /* Text shadow for better readability */
    line-height: 1.6; /* Improved line height for readability */
}

.project-link {
    color: var(--accent-color);
    text-decoration: none;
    font-weight: 600;
    align-self: flex-start;
    transition: color 0.3s, text-shadow 0.3s;
}
.project-link:hover {
    color: var(--primary-color);
    text-shadow: 0 0 10px var(--primary-color);
}


#skills {
    flex-direction: column;
}

.skills-grid {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 1.5rem;
    max-width: 900px;
    width: 100%;
}

@media (max-width: 768px) {
    .skills-grid {
        gap: 1rem;
    }
    
    .skill-item {
        padding: 0.8rem 1.5rem;
        font-size: 0.9rem;
    }
}

/* Mod Değiştirme Butonu Stilleri */
#theme-toggle-button {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: auto; /* Genişliği içeriğe göre ayarla */
    height: 46px;
    background-color: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 23px; /* Yuvarlak kenarlı dikdörtgen */
    cursor: pointer;
    z-index: 1001;
    display: flex;
    justify-content: center;
    align-items: center;
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    transition: background-color 0.3s, transform 0.3s, width 0.3s ease-in-out;
    padding: 0 0.9rem; /* İç boşluk */
}

#theme-toggle-button:hover {
    background-color: rgba(255, 255, 255, 0.2);
    transform: scale(1.1);
}

.button-content {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.button-text {
    color: var(--primary-color);
    font-weight: 600;
    font-size: 0.85rem;
    white-space: nowrap;
    transition: color 0.3s;
}

.button-content svg {
    width: 22px;
    height: 22px;
    color: var(--primary-color);
    transition: color 0.3s;
    flex-shrink: 0; /* İkonların küçülmesini engelle */
}

@media (max-width: 768px) {
    #theme-toggle-button {
        height: 40px;
        border-radius: 20px;
        padding: 0 0.8rem;
        bottom: 1.5rem;
        right: 1.5rem;
    }
    .button-content svg {
        width: 18px;
        height: 18px;
    }
    .button-text {
        font-size: 0.75rem;
    }
}

.skill-item {
    background: transparent;
    border-radius: 10px;
    padding: 1rem 2rem;
    font-size: 1rem;
    font-weight: 500;
    color: var(--primary-color);
    display: flex;
    align-items: center;
    gap: 0.8rem;
    transition: all 0.3s ease, opacity 0.6s ease;
    box-shadow: none;
    border: 1px solid transparent; /* Start with a transparent border */
    /* Animasyon kaldırıldı - temiz görünüm */
    opacity: 1;
    transform: none;
}
.skill-item:hover {
    background-color: rgba(255, 255, 255, 0.05); /* Subtle background color */
    backdrop-filter: blur(8px); /* Frosted glass effect */
    -webkit-backdrop-filter: blur(8px); /* For Safari support */
    border: 1px solid rgba(255, 255, 255, 0.1); /* Subtle border on hover */
    color: var(--accent-color);
    transform: translateY(-5px);
    box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37); /* Add depth */
}

.skill-item span {
    display: inline-block;
    width: 8px;
    height: 8px;
    background-color: var(--accent-color);
    border-radius: 50%;
    transition: background-color 0.3s;
}
.skill-item:hover span {
    background-color: var(--bg-color);
}

/* Yeni Deneyim Bölümü Stilleri */
.experience-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr); /* Masaüstünde 3 sütun */
    gap: 2.5rem; /* Kartlar arası boşluk */
    width: 100%;
    max-width: 1200px;
    padding: 0 2rem;
}

.experience-item {
    background: rgba(0, 0, 0, 0.4); /* Okunabilirlik için koyu filmli cam efekti */
    padding: 2rem;
    border-radius: 10px;
    border-left: 3px solid var(--accent-color); /* Vurgu çizgisi */
    transition: transform 0.3s ease, background 0.3s ease, opacity 0.6s ease;
    text-align: left; /* Metinleri sola hizala */
    /* Animasyon kaldırıldı - temiz görünüm */
    opacity: 1;
    transform: none;
}

.experience-item:hover {
    transform: translateY(-8px); /* Hafifçe yukarı kalkma efekti */
    background: rgba(0, 0, 0, 0.6); /* Hover'da daha koyu */
}

.experience-item h3 {
    font-size: 1.3rem;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.experience-item p {
    font-size: 1rem;
    color: #ffffff; /* Proje kartlarındaki gibi parlak beyaz */
    text-shadow: 0 0 5px rgba(0, 0, 0, 0.5); /* Okunabilirliği artıran hafif gölge */
    margin-bottom: 1rem;
}

.experience-item .experience-date {
    font-style: italic;
    font-size: 0.9rem;
    color: #bbbbbb; /* Daha okunaklı bir gri tonu */
}

/* Mobil için özel ayarlar */
@media (max-width: 992px) { /* Daha erken kırılsın diye 992px'e çektim */
    .experience-grid {
        grid-template-columns: 1fr; /* Mobilde tek sütun */
        gap: 2rem;
        padding: 0;
    }
}

/* Animasyonlar kaldırıldı - temiz ve hızlı sayfa */

@media (max-width: 768px) {
    .experience-item {
        padding: 1.5rem;
    }

    .experience-item h3 {
        font-size: 1.2rem;
    }
}

#contact {
    flex-direction: column;
}

.contact-subtitle {
    max-width: 500px;
    text-align: center;
    margin-bottom: 2rem;
}

@media (max-width: 768px) {
    .contact-subtitle {
        max-width: 100%;
        font-size: 0.95rem;
        margin-bottom: 1.5rem;
    }
    
    .contact-info {
        margin-top: 1.5rem;
        font-size: 0.95rem;
    }
}

.glow-button {
    display: inline-block;
    padding: 1rem 2.5rem;
    border: none;
    color: var(--accent-color);
    background: transparent;
    text-decoration: none;
    border-radius: 50px;
    font-weight: 700;
    font-size: 1rem;
    transition: background-color 0.3s, color 0.3s, box-shadow 0.3s, transform 0.3s;
    box-shadow: 0 0 20px var(--glow-color);
}

@media (max-width: 768px) {
    .glow-button {
        padding: 0.8rem 2rem;
        font-size: 0.9rem;
    }
}

.glow-button:hover {
    background-color: var(--accent-color);
    color: var(--bg-color);
    box-shadow: 0 0 30px var(--glow-color), 0 0 40px var(--glow-color);
    transform: translateY(-3px);
}

.contact-info {
    margin-top: 2rem;
    color: var(--text-color);
}

footer {
    position: fixed; /* Sahnenin üzerini örtmemesi için sabitlendi */
    bottom: 0;
    left: 0;
    width: 100%;
    text-align: center;
    padding: 2rem;
    background: transparent;
    border-top: none;
    z-index: 999; /* Header'ın altında kalması için */
    opacity: 0; /* Varsayılan olarak gizli */
    visibility: hidden;
    transition: opacity 0.5s ease, visibility 0.5s ease;
}

.footer-visible {
    opacity: 1;
    visibility: visible;
}

@media (max-width: 768px) {
    footer {
        padding: 1.5rem;
        font-size: 0.9rem;
    }
}