/* --- Eski stilin tamamı (stil - Kopya.css) --- */
@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@400;700&display=swap');
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
body {
    font-family: 'Poppins', sans-serif;
    background-color: #282828;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 20px;
    color: #d4d4d4;
    overflow-x: hidden;
}
/* ... (stil - Kopya.css'in tüm eski kodları buraya eklenecek) ... */
/* --- Modern üst bar ve ana sayfa linki için eklemeler --- */
.top-bar {
    position: sticky;
    top: 0;
    z-index: 100;
    width: 100vw;
    left: 0;
    background: linear-gradient(90deg, #1e1e5f 0%, #e44d26 100%);
    color: #fff;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 18px 32px;
    font-size: 1.5rem;
    font-weight: 700;
    box-shadow: 0 2px 8px rgba(0,0,0,0.12);
    margin-bottom: 32px;
}
.top-bar .logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.7rem;
    font-weight: 700;
    letter-spacing: 1px;
}
.top-bar .nav {
    display: flex;
    align-items: center;
    gap: 16px;
}
.top-bar .nav a {
    background: #fff;
    color: #e44d26;
    padding: 8px 20px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    font-size: 1rem;
    box-shadow: 0 2px 8px rgba(0,0,0,0.08);
    transition: background 0.2s, color 0.2s;
}
.top-bar .nav a:hover {
    background: #e44d26;
    color: #fff;
}

/* Giriş/Kayıt Formu ve Container için Modern AI Stili */
.wrapper {
    display: flex;
    flex-direction: row;
    align-items: center;
    max-width: 1000px;
    width: 100%;
    gap: 40px;
    margin: 0 auto;
    justify-content: center;
}
.intro-section {
    flex: 1;
    text-align: left;
    max-width: 400px;
}
.intro-section h2 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 20px;
    color: #a1a1ff;
    text-shadow: 0 0 10px rgba(161, 161, 255, 0.5);
}
.intro-section p {
    font-size: 1.1rem;
    line-height: 1.6;
    margin-bottom: 20px;
    color: #d0d0ff;
}
.container {
    flex: 1;
    background: rgba(20, 20, 40, 0.95);
    border-radius: 15px;
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.6), 0 0 20px rgba(65, 65, 255, 0.2);
    width: 100%;
    max-width: 450px;
    overflow: hidden;
    position: relative;
}
.header {
    text-align: center;
    padding: 20px;
    background: linear-gradient(to right, #3b3bff, #ff4d4d);
    color: #fff;
    border-radius: 15px 15px 0 0;
}
.header h1 {
    font-size: 2.2rem;
    font-weight: 700;
    text-shadow: 0 0 10px rgba(255, 255, 255, 0.5);
}
.form-container {
    padding: 30px;
}
.tab {
    display: flex;
    background: #2a2a5a;
    border-radius: 8px;
    margin-bottom: 20px;
    overflow: hidden;
}
.tab button {
    flex: 1;
    padding: 15px;
    border: none;
    background: none;
    font-size: 1.2rem;
    cursor: pointer;
    color: #a1a1ff;
    transition: all 0.3s ease;
}
.tab button.active {
    background: #141428;
    color: #fff;
    font-weight: bold;
    border-bottom: 4px solid #3b3bff;
}
.form-group {
    margin-bottom: 20px;
}
.form-group label {
    display: block;
    color: #a1a1ff;
    margin-bottom: 8px;
    font-size: 0.9rem;
}
.form-group input {
    width: 100%;
    padding: 12px;
    border: 1px solid #3b3bff;
    border-radius: 8px;
    font-size: 1rem;
    background: #1e1e5f;
    color: #e0e0ff;
    transition: border-color 0.3s, box-shadow 0.3s;
}
.form-group input:focus {
    border-color: #ff4d4d;
    box-shadow: 0 0 8px rgba(255, 77, 77, 0.5);
    outline: none;
}
.form-group button, .form-container button {
    width: 100%;
    padding: 12px;
    background: #3b3bff;
    color: #fff;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    cursor: pointer;
    font-weight: 600;
    transition: background 0.3s, transform 0.2s, box-shadow 0.3s;
}
.form-group button:hover, .form-container button:hover {
    background: #ff4d4d;
    transform: translateY(-2px);
    box-shadow: 0 0 15px rgba(255, 77, 77, 0.5);
}
@media (max-width: 900px) {
    .wrapper {
        flex-direction: column;
        gap: 24px;
        align-items: stretch;
    }
    .intro-section {
        max-width: 100%;
        margin-bottom: 20px;
        text-align: center;
    }
    .container {
        max-width: 100%;
    }
}