/* Genel Sıfırlamalar ve Temel Ayarlar */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Karanlık Tema Renkleri */
    --color-bg-primary: #121212; /* Ana Arka Plan */
    --color-bg-secondary: #1e1e1e; /* Bölüm Arka Planı */
    --color-text-primary: #e0e0e0; /* Ana Metin Rengi */
    --color-text-secondary: #b0b0b0; /* İkincil Metin Rengi */
    --color-accent: #00bcd4; /* Vurgu Rengi (Mavi/Turkuaz) */
    --color-card-bg: #2c2c2c; /* Kart Arka Planı */
    --color-border: #3a3a3a; /* Kenarlık Rengi */
    --color-shadow: rgba(0, 0, 0, 0.5); /* Gölge Rengi */
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--color-bg-primary);
    color: var(--color-text-primary);
    line-height: 1.6;
    /* Smooth Scroll Özelliği */
    scroll-behavior: smooth;
}

/* Kapsayıcı (Container) */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Başlıklar */
h1, h2, h3 {
    color: var(--color-text-primary);
    margin-bottom: 0.5em;
    font-weight: 600;
}

h1 { font-size: 3em; }
h2 { font-size: 2em; }
h3 { font-size: 1.5em; }

/* Butonlar */
.btn {
    display: inline-block;
    padding: 10px 25px;
    background-color: var(--color-accent);
    color: var(--color-bg-primary); /* Buton metni karanlık arka plan renginde */
    text-decoration: none;
    border-radius: 5px;
    transition: background-color 0.3s, transform 0.2s;
    font-weight: 700;
    border: none;
    cursor: pointer;
}

.btn:hover {
    background-color: #0097a7; /* Vurgu renginin biraz daha koyusu */
    transform: translateY(-2px);
}

/* Bölüm Ayarları */
.section-padding {
    padding: 80px 0;
}

/* ====================================
   NAVBAR (Sabit Menü)
   ==================================== */
.navbar {
    position: sticky;
    top: 0;
    z-index: 1000;
    background-color: var(--color-bg-secondary);
    box-shadow: 0 2px 10px var(--color-shadow);
    padding: 15px 0;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.navbar .logo {
    color: var(--color-accent);
    text-decoration: none;
    font-size: 1.5em;
    font-weight: 700;
}

.navbar nav a {
    color: var(--color-text-secondary);
    text-decoration: none;
    margin-left: 25px;
    font-weight: 500;
    transition: color 0.3s;
}

.navbar nav a:hover {
    color: var(--color-accent);
}

/* ====================================
   HERO Bölümü
   ==================================== */
.hero {
    height: 100vh; /* Tam ekran yüksekliği */
    display: flex;
    align-items: center;
    text-align: center;
    background-color: var(--color-bg-primary);
}

.hero h1 {
    font-size: 4.5em;
    margin-bottom: 0.1em;
}

.hero h2 {
    font-size: 2.5em;
    color: var(--color-accent);
    margin-bottom: 0.5em;
}

.hero p {
    font-size: 1.2em;
    color: var(--color-text-secondary);
    margin-bottom: 30px;
}

/* ====================================
   HAKKIMDA Bölümü
   ==================================== */
.about {
    background-color: var(--color-bg-secondary);
    text-align: center;
}

.about p {
    max-width: 800px;
    margin: 20px auto;
    font-size: 1.1em;
}

/* ====================================
   YETENEKLER Bölümü
   ==================================== */
.skills {
    text-align: center;
}

.skill-cards {
    display: flex;
    justify-content: center;
    gap: 30px;
    margin-top: 40px;
    flex-wrap: wrap; /* Responsive için */
}

.card {
    background-color: var(--color-card-bg);
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 4px 15px var(--color-shadow);
    transition: transform 0.3s, box-shadow 0.3s;
    flex: 1;
    min-width: 250px;
    max-width: 350px;
    text-align: left;
    border-left: 5px solid var(--color-accent);
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px var(--color-shadow);
}

.card h3 {
    color: var(--color-accent);
    margin-top: 0;
}

/* ====================================
   PROJELER Bölümü
   ==================================== */
.projects {
    background-color: var(--color-bg-secondary);
    text-align: center;
}

.project-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-top: 40px;
}

.project-card {
    text-align: left;
    border-left: 5px solid var(--color-accent);
}

.project-card h3 {
    margin-bottom: 10px;
}

.project-card p {
    color: var(--color-text-secondary);
    margin-bottom: 10px;
}

.project-card .tech-stack {
    font-style: italic;
    font-size: 0.9em;
    color: var(--color-accent);
}

/* ====================================
   İLETİŞİM Bölümü
   ==================================== */
.contact {
    text-align: center;
}

.contact-form {
    max-width: 600px;
    margin: 40px auto 0;
    padding: 30px;
    background-color: var(--color-card-bg);
    border-radius: 8px;
    box-shadow: 0 4px 15px var(--color-shadow);
    text-align: left;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--color-text-primary);
}

.form-group input[type="text"],
.form-group input[type="email"],
.form-group textarea {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--color-border);
    border-radius: 5px;
    background-color: var(--color-bg-primary);
    color: var(--color-text-primary);
    font-size: 1em;
    transition: border-color 0.3s;
}

.form-group input:focus,
.form-group textarea:focus {
    border-color: var(--color-accent);
    outline: none;
}

.contact-form button.btn {
    width: 100%;
    padding: 15px;
    font-size: 1.1em;
}

/* ====================================
   FOOTER
   ==================================== */
footer {
    background-color: var(--color-bg-secondary);
    padding: 20px 0;
    text-align: center;
    border-top: 1px solid var(--color-border);
}

footer p {
    color: var(--color-text-secondary);
    font-size: 0.9em;
}

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

/* Tablet ve daha küçük cihazlar (max-width: 768px) */
@media (max-width: 768px) {
    .navbar .container {
        flex-direction: column;
        text-align: center;
    }

    .navbar nav {
        margin-top: 10px;
    }

    .navbar nav a {
        margin: 0 10px;
        display: inline-block;
    }

    .hero {
        height: auto; /* Küçük ekranlarda tam ekran yüksekliğini kaldır */
        padding: 150px 0 80px; /* Üstten ve alttan boşluk ekle */
    }

    .hero h1 {
        font-size: 3em;
    }

    .hero h2 {
        font-size: 1.8em;
    }

    .section-padding {
        padding: 60px 0;
    }

    .skill-cards {
        flex-direction: column;
        align-items: center;
    }

    .card {
        max-width: 100%;
    }

    .project-cards {
        grid-template-columns: 1fr; /* Tek sütuna düşür */
    }
}

/* Çok küçük cihazlar (max-width: 480px) */
@media (max-width: 480px) {
    .navbar nav a {
        display: block;
        margin: 5px 0;
    }

    .hero h1 {
        font-size: 2.5em;
    }

    .hero h2 {
        font-size: 1.5em;
    }
}