/* GENEL AYARLAR */
* { box-sizing: border-box; }
body {
    margin: 0;
    font-family: 'Roboto', sans-serif;
    color: #ffffff;
    background-color: #0d0d12;
}

h1, h2, legend, .siber-buton, th {
    font-family: 'Orbitron', sans-serif;
}

/* Arka Plan Video */
#arkaplan-video {
    position: fixed;
    right: 0;
    bottom: 0;
    min-width: 100%;
    min-height: 100%;
    z-index: -2;
    object-fit: cover;
}

.video-perde {
    position: fixed;
    top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(10, 10, 15, 0.75);
    z-index: -1;
}

/* Üst Menü */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 50px;
    background: rgba(0, 0, 0, 0.8);
    border-bottom: 2px solid #ff0055;
}

.logo { margin: 0; font-size: 28px; letter-spacing: 2px; }
.logo span { color: #00ffcc; }

nav a {
    color: #fff;
    text-decoration: none;
    margin-left: 25px;
    font-weight: bold;
    font-size: 16px;
    transition: 0.3s;
    padding-bottom: 5px;
}

nav a:hover, nav a.aktif {
    color: #00ffcc;
    border-bottom: 2px solid #00ffcc;
}

/* Ana Sayfa İçerik */
.merkez-icerik {
    text-align: center;
    margin-top: 15vh;
}
.merkez-icerik h2 { font-size: 50px; text-shadow: 0 0 20px #ff0055; margin-bottom: 10px; }
.merkez-icerik p { font-size: 20px; color: #ccc; }
.ses-kutusu { margin: 30px auto; background: rgba(0,0,0,0.6); padding: 15px; width: 350px; border-radius: 10px; border: 1px solid #00ffcc; }

/* Siber Buton */
.siber-buton {
    display: inline-block;
    background: #ff0055;
    color: #fff;
    padding: 15px 40px;
    font-size: 18px;
    font-weight: bold;
    text-decoration: none;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    box-shadow: 0 0 15px rgba(255, 0, 85, 0.5);
    transition: 0.3s;
}
.siber-buton:hover {
    background: #00ffcc;
    color: #000;
    box-shadow: 0 0 25px rgba(0, 255, 204, 0.8);
}
.tam-genislik { width: 100%; margin-top: 15px; }

/* Form Tasarımı */
.form-kapsayici { max-width: 500px; margin: 40px auto; padding: 20px; }
fieldset {
    border: 2px solid #00ffcc;
    border-radius: 10px;
    padding: 30px;
    background: #151520;
    box-shadow: 0 0 20px rgba(0, 255, 204, 0.1);
}
legend { font-size: 22px; color: #00ffcc; padding: 0 10px; }
.form-grup { margin-bottom: 20px; }
.form-grup label { display: block; margin-bottom: 8px; font-weight: bold; color: #aaa; }
.form-grup input[type="text"], .form-grup input[type="email"], .form-grup input[type="number"], .form-grup select {
    width: 100%;
    padding: 12px;
    background: #0d0d12;
    border: 1px solid #333;
    color: #fff;
    border-radius: 5px;
    font-size: 16px;
}
.form-grup input:focus, .form-grup select:focus {
    outline: none;
    border-color: #ff0055;
    box-shadow: 0 0 8px rgba(255, 0, 85, 0.5);
}
.radyo-grup label { display: inline; margin-right: 15px; color: #fff; font-weight: normal;}

/* Tablo Tasarımı (Görev 2: border-collapse ve Görev 3: Zebra) */
.tablo-kapsayici { max-width: 950px; margin: 40px auto; padding: 20px; text-align: center; }
table {
    width: 100%;
    border-collapse: collapse; /* Çift çizgi sorununu çözer */
    margin-top: 20px;
    background: #151520;
    border-radius: 8px;
    overflow: hidden;
}
th, td { padding: 15px; text-align: left; border-bottom: 1px solid #2a2a35; }
th { background-color: #ff0055; color: #fff; text-transform: uppercase; font-size: 14px; }

/* Görev 3: Zebra Tablo Tasarımı */
tbody tr:nth-child(even) { background-color: #1a1a28; }
tbody tr:hover { background-color: #222230; color: #00ffcc; }

.sil-buton { background: #333; color: #aaa; border: 1px solid #555; padding: 10px 20px; margin-top: 20px; cursor: pointer; border-radius: 5px;}
.sil-buton:hover { background: red; color: white; border-color: red;}
.tekli-sil-buton { background: #ff0055; color: white; border: none; padding: 6px 12px; border-radius: 4px; cursor: pointer; }
.tekli-sil-buton:hover { background: #cc0044; }