:root {
    --primary-color: #2979FF;
    --background-color: #fafcfd;
    --form-bg-color: #FFFFFF;
    --text-color-dark: #263238;
    --text-color-light: #90A4AE;
    --border-color: #CFD8DC;
    --main-bg-gradient: linear-gradient(120deg, #231648 0%, #2683b2 100%);
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: 'Poppins', sans-serif;
    color: var(--text-color-dark);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background: var(--main-bg-gradient);
}

.login-container {
    display: flex;
    width: 400px;
    height: 580px;
    background-color: var(--background-color);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.1);
    border-radius: 25px;
    overflow: hidden;
    animation: fadein 0.6s ease-in-out;
}

@keyframes fadein {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.login-form-panel {
    flex: 0 0 400px;
    background-color: var(--form-bg-color);
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 40px;
    box-shadow: 5px 0 15px rgba(0,0,0,0.05);
}

.form-wrapper {
    width: 100%;
}

.form-wrapper h2 {
    font-size: 22px;
    font-weight: 700;
    color: var(--text-color-dark);
    margin-bottom: 40px;
    text-align: center;
}

.input-group {
    position: relative;
    margin-bottom: 25px;
}

.input-group i {
    position: absolute;
    left: 10px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--primary-color);
    font-size: 20px;
    transition: color 0.3s;
}

.input-group:focus-within i {
    color: #1E88E5;
}

.form-control {
    width: 100%;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 10px 10px 10px 40px;
    font-size: 15px;
    background: transparent;
    transition: border-color 0.3s, box-shadow 0.3s;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 4px rgba(41, 121, 255, 0.15);
}

.btn-sign-in {
    width: 100%;
    padding: 12px;
    border: none;
    border-radius: 8px;
    background: linear-gradient(135deg, #2979FF, #004e92);
    color: white;
    font-size: 14px;
    font-weight: 600;
    text-transform: uppercase;
    cursor: pointer;
    transition: transform 0.25s ease, box-shadow 0.25s ease;
    margin-top: 10px;
}

.btn-sign-in:hover {
    background-color: #1E88E5;
    transform: translateY(-3px);
    box-shadow: 0 8px 18px rgba(41, 121, 255, 0.5);
}

.error-message {
    background-color: #fdecea;
    color: #c0392b;
    border: 1px solid #f5c6cb;
    padding: 10px 15px;
    border-radius: 8px;
    font-size: 13px;
    margin-bottom: 20px;
    text-align: center;
}

.footer-message {
    text-align: center;
    font-size: 12px;
    color: var(--text-color-light);
    margin-top: 30px;
}

.welcome-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 60px;
    text-align: center;
}

.welcome-content .logo {
    text-align: center;
    margin-bottom: 20px;
}

.welcome-content h1 {
    font-size: 32px;
    font-weight: 700;
    color: var(--text-color-dark);
    margin-bottom: 10px;
    text-align: center;
}

.welcome-content p {
    font-size: 15px;
    color: var(--text-color-light);
    line-height: 1.6;
    text-align: center;
}

@media (max-width: 900px) {
    .login-container {
        flex-direction: column;
        width: 90%;
        max-width: 400px;
        height: auto;
        margin: 20px 0;
        background: var(--form-bg-color);
    }

    .welcome-content {
        display: none;
    }

    .login-form-panel {
        box-shadow: none;
        border-radius: 25px;
    }
}