:root {
    --red: #D31111;
    --black: #0E0E0E;
    --white: #FFFFFF;
}

* { margin: 0; padding: 0; box-sizing: border-box; font-family: 'Poppins', sans-serif; }

body {
    background: #f0f0f0;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    overflow: hidden;
}

.login-container {
    background: var(--white);
    width: 900px;
    height: 550px;
    display: flex;
    box-shadow: 0 20px 50px rgba(0,0,0,0.2);
    border-radius: 8px;
    overflow: hidden;
    position: relative;
}

/* Sol Taraftaki Marka Alanı */
.brand-side {
    flex: 1;
    background: var(--black);
    color: var(--white);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    position: relative;
    clip-path: polygon(0 0, 100% 0, 85% 100%, 0% 100%); /* Logonun o keskin eğimi */
}

.brand-overlay {
    position: absolute;
    top: 0; left: 0; width: 100%; height: 100%;
    background: linear-gradient(45deg, var(--red) 0%, transparent 70%);
    opacity: 0.3;
}

.login-logo {
    width: 80%;
    margin-bottom: 20px;
    z-index: 1;
}

.brand-side h2 { font-style: italic; font-weight: 900; z-index: 1; }
.brand-side p { font-size: 0.8rem; letter-spacing: 2px; z-index: 1; }

/* Sağ Taraftaki Form Alanı */
.form-side {
    flex: 1;
    padding: 40px;
    display: flex;
    align-items: center;
}

.form-wrapper { width: 100%; position: relative; }

form {
    display: none;
    flex-direction: column;
    animation: slideIn 0.5s ease;
}

form.active { display: flex; }

h3 {
    font-weight: 900;
    font-style: italic;
    margin-bottom: 30px;
    border-left: 5px solid var(--red);
    padding-left: 10px;
}

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

input {
    width: 100%;
    padding: 12px;
    border: 1px solid #ddd;
    background: #f9f9f9;
    outline: none;
    transition: 0.3s;
}

input:focus { border-color: var(--red); background: white; }

.submit-btn {
    background: var(--black);
    color: var(--white);
    padding: 15px;
    border: none;
    font-weight: bold;
    font-style: italic;
    cursor: pointer;
    transition: 0.3s;
    clip-path: polygon(5% 0, 100% 0, 95% 100%, 0% 100%);
}

.submit-btn:hover { background: var(--red); transform: scale(1.02); }

.toggle-text { margin-top: 20px; font-size: 0.9rem; text-align: center; }
.toggle-text a { color: var(--red); text-decoration: none; font-weight: bold; }

@keyframes slideIn {
    from { opacity: 0; transform: translateX(20px); }
    to { opacity: 1; transform: translateX(0); }
}
/* Hata Mesajı Stili */
.error-msg {
    color: var(--red);
    background: rgba(211, 17, 17, 0.1);
    padding: 10px;
    font-size: 0.85rem;
    font-weight: bold;
    margin-bottom: 15px;
    border-left: 3px solid var(--red);
    display: none; /* Başlangıçta gizli */
    animation: fadeIn 0.3s ease;
}

/* Sallanma Animasyonu */
.shake {
    animation: shakeAnim 0.4s ease-in-out;
}

@keyframes shakeAnim {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-10px); }
    50% { transform: translateX(10px); }
    75% { transform: translateX(-10px); }
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}