:root {
    --primary-color: #512da8;
    --primary-light: #8559da;
    --primary-dark: #140078;
    --secondary-color: #ff4081;
    --light-color: #f5f5f5;
    --dark-color: #333;
    --gray-color: #757575;
    --error-color: #f44336;
    --success-color: #4caf50;
    --warning-color: #ff9800;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Poppins', sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background: var(--light-color);
    color: var(--dark-color);
    line-height: 1.6;
}

.container {
    position: relative;
    width: 768px;
    max-width: 100%;
    min-height: 480px;
    background: #fff;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 14px 28px rgba(0, 0, 0, 0.1), 0 10px 10px rgba(0, 0, 0, 0.1);
}

.form-container {
    position: absolute;
    top: 0;
    height: 100%;
    transition: all 0.6s ease-in-out;
}

.sign-in-container {
    left: 0;
    width: 50%;
    z-index: 2;
}

.sign-up-container {
    left: 0;
    width: 50%;
    opacity: 0;
    z-index: 1;
}

.container.right-panel-active .sign-in-container {
    transform: translateX(100%);
}

.container.right-panel-active .sign-up-container {
    transform: translateX(100%);
    opacity: 1;
    z-index: 5;
    animation: show 0.6s;
}

@keyframes show {
    0%, 49.99% {
        opacity: 0;
        z-index: 1;
    }
    50%, 100% {
        opacity: 1;
        z-index: 5;
    }
}

.overlay-container {
    position: absolute;
    top: 0;
    left: 50%;
    width: 50%;
    height: 100%;
    overflow: hidden;
    transition: transform 0.6s ease-in-out;
    z-index: 100;
}

.container.right-panel-active .overlay-container {
    transform: translateX(-100%);
}

.overlay {
    background: linear-gradient(to right, var(--primary-light), var(--primary-color)) no-repeat 0 0 / cover;
    color: #fff;
    position: relative;
    left: -100%;
    height: 100%;
    width: 200%;
    transform: translateX(0);
    transition: transform 0.6s ease-in-out;
}

.container.right-panel-active .overlay {
    transform: translateX(50%);
}

.overlay-panel {
    position: absolute;
    top: 0;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 0 40px;
    height: 100%;
    width: 50%;
    text-align: center;
    transform: translateX(0);
    transition: transform 0.6s ease-in-out;
}

.overlay-left {
    transform: translateX(-20%);
}

.container.right-panel-active .overlay-left {
    transform: translateX(0);
}

.overlay-right {
    right: 0;
    transform: translateX(0);
}

.container.right-panel-active .overlay-right {
    transform: translateX(20%);
}

h1 {
    font-weight: 700;
    margin: 0;
    font-size: 2.2rem;
}

p {
    font-size: 14px;
    font-weight: 300;
    line-height: 20px;
    letter-spacing: 0.5px;
    margin: 20px 0 30px;
}

span {
    font-size: 12px;
    color: var(--gray-color);
    margin: 10px 0;
}

a {
    color: var(--secondary-color);
    font-size: 14px;
    text-decoration: none;
    margin: 15px 0;
    cursor: pointer;
}

button {
    border-radius: 20px;
    border: 1px solid var(--primary-color);
    background: var(--primary-color);
    color: #fff;
    font-size: 12px;
    font-weight: 600;
    padding: 12px 45px;
    letter-spacing: 1px;
    text-transform: uppercase;
    transition: transform 80ms ease-in, background 0.3s ease;
    cursor: pointer;
}

button:active {
    transform: scale(0.95);
}

button:focus {
    outline: none;
}

button.ghost {
    background: transparent;
    border-color: #fff;
}

button:hover {
    background: var(--primary-dark);
}

form {
    background: #fff;
    display: flex;
    flex-direction: column;
    padding: 0 50px;
    height: 100%;
    justify-content: center;
    align-items: center;
}

input {
    background: #eee;
    border: none;
    padding: 12px 15px;
    margin: 8px 0;
    width: 100%;
    border-radius: 5px;
    font-family: inherit;
}

input:focus {
    outline: 2px solid var(--primary-light);
}

.social-container {
    margin: 20px 0;
}

.social-container a {
    border: 1px solid #ddd;
    border-radius: 50%;
    display: inline-flex;
    justify-content: center;
    align-items: center;
    margin: 0 5px;
    height: 40px;
    width: 40px;
    color: var(--dark-color);
    transition: all 0.3s ease;
}

.social-container a:hover {
    background: var(--primary-color);
    color: #fff;
    border-color: var(--primary-color);
}

.password-container {
    position: relative;
    width: 100%;
}

.toggle-password {
    position: absolute;
    right: 10px;
    top: 50%;
    transform: translateY(-50%);
    cursor: pointer;
    color: var(--gray-color);
}

.password-strength-meter {
    width: 100%;
    margin: 5px 0 15px;
}

.strength-bar {
    height: 5px;
    background: #ddd;
    border-radius: 5px;
    overflow: hidden;
    margin-bottom: 5px;
}

.strength-bar::after {
    content: '';
    display: block;
    height: 100%;
    width: 0;
    background: var(--error-color);
    transition: width 0.3s ease, background 0.3s ease;
}

.strength-labels {
    display: flex;
    justify-content: space-between;
    font-size: 10px;
    color: var(--gray-color);
}

.remember-me {
    display: flex;
    align-items: center;
    width: 100%;
    margin: 10px 0;
    font-size: 14px;
}

.remember-me input {
    width: auto;
    margin-right: 10px;
}

/* Modal Styles */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    justify-content: center;
    align-items: center;
}

.modal-content {
    background: #fff;
    padding: 30px;
    border-radius: 10px;
    width: 100%;
    max-width: 400px;
    position: relative;
}

.close {
    position: absolute;
    top: 15px;
    right: 15px;
    font-size: 24px;
    color: var(--gray-color);
    cursor: pointer;
}

/* Notification */
.notification {
    position: fixed;
    top: 20px;
    right: 20px;
    padding: 15px 25px;
    border-radius: 5px;
    color: white;
    font-weight: 500;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    transform: translateX(150%);
    transition: transform 0.3s ease;
    z-index: 1000;
}

.notification.show {
    transform: translateX(0);
}

.notification.success {
    background-color: var(--success-color);
}

.notification.error {
    background-color: var(--error-color);
}

.notification.warning {
    background-color: var(--warning-color);
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        width: 100%;
        height: 100vh;
        border-radius: 0;
    }

    .sign-in-container,
    .sign-up-container {
        width: 100%;
    }

    .overlay-container {
        display: none;
    }

    .container.right-panel-active .sign-in-container,
    .container.right-panel-active .sign-up-container {
        transform: translateX(0);
    }
}