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

        body, html {
            height: 100%;
            width: 100%;
            overflow-x: hidden;
        }

        /* == ANA KAPLAYICI (SPLIT SCREEN) == */
        .split-container {
            display: flex;
            height: 100vh;
            width: 100%;
        }

        /* == SOL TARAF (BİLGİ & MARKA) == */
        .left-panel {
            flex: 1;
            /* Kırmızı Gradient */
            background: linear-gradient(135deg, #d32f2f 0%, #ff5252 100%);
            color: white;
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            padding: 40px;
            text-align: center;
            position: relative;
            overflow: hidden;
        }

        /* Arka plan süslemeleri */
        .left-panel::before {
            content: '';
            position: absolute;
            width: 300px;
            height: 300px;
            background: rgba(255, 255, 255, 0.1);
            border-radius: 50%;
            top: -50px;
            left: -50px;
        }
        .left-panel::after {
            content: '';
            position: absolute;
            width: 200px;
            height: 200px;
            background: rgba(255, 255, 255, 0.1);
            border-radius: 50%;
            bottom: 50px;
            right: 50px;
        }

        .brand-content {
            z-index: 2;
            max-width: 500px;
        }

        .brand-icon {
            font-size: 80px;
            margin-bottom: 20px;
            color: rgba(255,255,255,0.9);
        }

        .brand-title {
            font-size: 48px;
            font-weight: 700;
            margin-bottom: 15px;
            letter-spacing: 1px;
        }

        .brand-description {
            font-size: 18px;
            line-height: 1.6;
            opacity: 0.9;
            margin-bottom: 30px;
        }

        .features-list {
            list-style: none;
            text-align: left;
            margin-top: 20px;
        }

        .features-list li {
            margin-bottom: 15px;
            font-size: 16px;
            display: flex;
            align-items: center;
        }

        .features-list i {
            margin-right: 10px;
            background: rgba(255,255,255,0.2);
            padding: 8px;
            border-radius: 50%;
            width: 35px;
            height: 35px;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        /* == SAĞ TARAF (GİRİŞ FORMU) == */
        .right-panel {
            flex: 1;
            background: #ffffff;
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            padding: 40px;
        }

        .login-wrapper {
            width: 100%;
            max-width: 400px;
            padding: 20px;
        }

        .login-title {
            font-size: 32px;
            color: #333;
            font-weight: 600;
            margin-bottom: 10px;
            text-align: center;
        }

        .login-subtitle {
            text-align: center;
            color: #666;
            margin-bottom: 40px;
            font-size: 14px;
        }

        /* Form Elemanları */
        .input-group {
            margin-bottom: 20px;
            position: relative;
        }

        .login-input {
            width: 100%;
            padding: 15px;
            padding-left: 45px;
            border: 1px solid #e1e1e1;
            border-radius: 8px;
            font-size: 15px;
            transition: all 0.3s;
            background: #f8f9fa;
        }

        .login-input:focus {
            outline: none;
            /* Kırmızı Focus */
            border-color: #d32f2f;
            background: #fff;
            box-shadow: 0 0 0 4px rgba(211, 47, 47, 0.1);
        }

        .input-icon {
            position: absolute;
            left: 15px;
            top: 50%;
            transform: translateY(-50%);
            color: #aaa;
            font-size: 18px;
        }

        .btn-login {
            width: 100%;
            padding: 15px;
            /* Kırmızı Buton */
            background: #d32f2f;
            color: white;
            border: none;
            border-radius: 8px;
            font-size: 16px;
            font-weight: 600;
            cursor: pointer;
            transition: background 0.3s;
            margin-top: 10px;
        }

        .btn-login:hover {
            /* Koyu Kırmızı Hover */
            background: #b71c1c;
        }
        
        .btn-login:disabled {
            background: #a0a0a0;
            cursor: not-allowed;
        }

        /* Linkler */
        .links-area {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-top: 20px;
            font-size: 14px;
        }

        .forgot-link {
            color: #666;
            text-decoration: none;
            transition: color 0.3s;
        }
        
        .forgot-link:hover {
            /* Kırmızı Hover */
            color: #d32f2f;
        }

        .create-account-link {
            /* Kırmızı Link */
            color: #d32f2f;
            font-weight: 600;
            text-decoration: none;
        }

        /* Hata Mesajı Kutusu */
        .message-box {
            padding: 12px;
            border-radius: 6px;
            margin-bottom: 20px;
            font-size: 14px;
            text-align: center;
        }
        .msg-error {
            background-color: #ffebee;
            color: #c62828;
            border: 1px solid #ef9a9a;
        }

        /* == RESPONSIVE (MOBİL) == */
        @media (max-width: 768px) {
            .split-container {
                flex-direction: column;
            }
            .left-panel {
                display: none; 
            }
            .right-panel {
                flex: 1;
            }
        }

        /* == MODAL STİLLERİ == */
        .modal-overlay {
            display: none;
            position: fixed;
            top: 0; left: 0;
            width: 100%; height: 100%;
            background: rgba(0,0,0,0.5);
            justify-content: center;
            align-items: center;
            z-index: 1000;
        }
        
        .modal-content {
            background: white;
            padding: 30px;
            border-radius: 12px;
            width: 90%;
            max-width: 400px;
            text-align: center;
            box-shadow: 0 10px 25px rgba(0,0,0,0.2);
            position: relative;
        }

        .close-modal {
            position: absolute;
            top: 15px; right: 15px;
            font-size: 24px;
            cursor: pointer;
            color: #aaa;
        }
        
        .sms-input {
            letter-spacing: 5px;
            text-align: center;
            font-size: 20px !important;
            font-weight: bold;
        }