/* --- RENK PALETİ VE AYARLAR --- */
:root {
    /* Senin Beğendiğin Palet Kodları */
    --bg-creme: #F2EBE5; /* Sayfa Zemini (Yumuşak Krem) */
    --text-dark: #260502; /* Ana Metin (Acı Kahve) */
    --accent-orange: #D9946C; /* Butonlar (Kiremit/Toprak) */
    --accent-brown: #8C5F45; /* Başlıklar/Kartlar (Sütlü Kahve) */
    --secondary-gray: #9FB0BF; /* Detaylar (Mavi Gri) */
    --white: #FFFFFF;
}

body {
    margin: 0;
    padding: 0;
    font-family: 'Georgia', 'Times New Roman', serif; /* Kitap hissi için tırnaklı yazı */
    background-color: var(--bg-creme);
    color: var(--text-dark);
    line-height: 1.6;
}

/* --- GENEL DÜZEN --- */
.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto; /* Ortala */
}

a {
    text-decoration: none;
    color: inherit;
    transition: 0.3s;
}

/* --- ÜST MENÜ --- */
header {
    background-color: var(--text-dark);
    color: var(--bg-creme);
    padding: 1rem 0;
    box-shadow: 0 2px 10px rgba(0,0,0,0.2);
}

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

.logo {
    font-size: 1.8rem;
    font-weight: bold;
    letter-spacing: 1px;
    font-family: 'Courier New', Courier, monospace; /* Daktilo havası */
}

nav a {
    margin-left: 20px;
    color: #ddd;
    font-size: 1rem;
}

.btn-login {
    border: 1px solid var(--accent-orange);
    padding: 8px 16px;
    border-radius: 4px;
    color: var(--accent-orange);
}

    .btn-login:hover {
        background-color: var(--accent-orange);
        color: var(--white);
    }

/* --- VİTRİN (HERO) --- */
.hero {
    /* Buraya ileride güzel bir kütüphane resmi koyabiliriz, şimdilik renk geçişi */
    background: linear-gradient(135deg, var(--text-dark), var(--accent-brown));
    color: var(--white);
    text-align: center;
    padding: 100px 20px;
}

    .hero h1 {
        font-size: 3rem;
        margin-bottom: 10px;
    }

    .hero p {
        font-size: 1.2rem;
        max-width: 600px;
        margin: 0 auto 30px auto;
        opacity: 0.9;
    }

.btn-primary {
    display: inline-block;
    background-color: var(--accent-orange);
    color: var(--white);
    padding: 15px 35px;
    border-radius: 5px;
    font-weight: bold;
    font-size: 1.1rem;
}

    .btn-primary:hover {
        background-color: #c4825b; /* Hafif koyusu */
        transform: translateY(-2px); /* Tıklama hissi */
    }

/* --- KARTLAR --- */
.features {
    display: flex;
    gap: 20px;
    margin-top: -50px; /* Hero'nun üstüne hafif binsin, modern dursun */
    flex-wrap: wrap;
}

.card {
    flex: 1;
    background-color: var(--white);
    padding: 30px;
    border-top: 5px solid var(--accent-brown);
    border-radius: 8px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.05);
    text-align: center;
    min-width: 250px;
}

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

/* --- FOOTER (ALT BİLGİ) --- */
footer {
    background-color: var(--secondary-gray);
    color: var(--text-dark);
    margin-top: 80px;
    padding: 40px 0 20px 0;
    border-top: 4px solid var(--accent-orange);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    margin-bottom: 20px;
}

.footer-links a {
    display: block; /* Alt alta dizilsin */
    margin-bottom: 5px;
    font-size: 0.9rem;
}

    .footer-links a:hover {
        color: var(--white);
    }

.copyright {
    text-align: center;
    font-size: 0.8rem;
    opacity: 0.7;
    border-top: 1px solid rgba(0,0,0,0.1);
    padding-top: 10px;
}

/* --- MOBİL UYUM (RESPONSIVE) --- */
@media (max-width: 768px) {
    .features {
        flex-direction: column;
        margin-top: 20px;
    }

    .hero h1 {
        font-size: 2rem;
    }
}