@import url('https://fonts.googleapis.com/css?family=Poppins:400,500,600,700&display=swap');

:root {
    --bg-color: #0f172a;
    --bg-gradient: radial-gradient(at 0% 0%, rgba(59, 130, 246, 0.15) 0px, transparent 50%),
                   radial-gradient(at 100% 0%, rgba(139, 92, 246, 0.15) 0px, transparent 50%),
                   radial-gradient(at 50% 100%, rgba(15, 23, 42, 1) 0px, transparent 50%);
    --text-main: #ffffff;
    --text-heading-gradient: linear-gradient(to right, #fff, #a2c2e8);
    --card-bg: #fff;
    --input-border: lightgrey;
    --input-focus: #7a1aa0;
    --slide-text: #fff;
    --slide-text-active: #000;
    --slide-tab: linear-gradient(to right, #764ba2, #570557);
}

[data-theme="light"] {
    --bg-color: #f0f2f5;
    --bg-gradient: radial-gradient(at 0% 0%, rgba(59, 130, 246, 0.1) 0px, transparent 50%),
                   radial-gradient(at 100% 0%, rgba(139, 92, 246, 0.1) 0px, transparent 50%),
                   radial-gradient(at 50% 100%, #ffffff 0px, transparent 50%);
    --text-main: #1e293b;
    --text-heading-gradient: linear-gradient(to right, #1a45a0, #4385f5);
    --card-bg: #ffffff;
    --input-border: #cbd5e1;
    --input-focus: #3b82f6;
    --slide-text: #fff;
    --slide-text-active: #000;
}

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

body {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    width: 100%;
    background-color: var(--bg-color);
    background-image: var(--bg-gradient);
    background-attachment: fixed;
    line-height: 1.6;
    overflow: hidden;
    gap: 20px;
    transition: background-color 0.3s ease;
}

.theme-toggle {
    position: absolute;
    top: 20px;
    right: 20px;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    padding: 10px;
    border-radius: 50%;
    cursor: pointer;
    color: var(--text-main);
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
}

.theme-toggle:hover {
    background: rgba(255, 255, 255, 0.2);
}

.welcome-heading {
    font-size: 3.5rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 20px;
    background: var(--text-heading-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    filter: drop-shadow(0px 2px 4px rgba(0,0,0,0.3));
    padding: 0 20px;
}

@media (max-width: 768px) {
    .welcome-heading {
        font-size: 2rem;
    }
}

.wrapper {
    overflow: hidden; 
    max-width: 390px;
    background: var(--card-bg);
    padding: 30px;
    border-radius: 15px;
    box-shadow: 0px 15px 20px rgba(0,0,0,0.1);
}

.wrapper .title-text {
    display: flex;
    width: 200%;
}

.wrapper .title {
    width: 50%;
    font-size: 35px;
    font-weight: 600;
    text-align: center;
    transition: all 0.6s cubic-bezier(0.68,-0.55,0.265,1.55);
    color: #000; 
}

.slide-controls {
    position: relative;
    display: flex;
    height: 50px;
    width: 100%;
    overflow: hidden;
    margin: 30px 0 10px 0;
    border: 1px solid lightgrey;
    border-radius: 15px;
}

.slide-controls .slide {
    height: 100%;
    width: 100%;
    color: var(--slide-text);
    font-size: 18px;
    font-weight: 500;
    text-align: center;
    line-height: 48px;
    cursor: pointer;
    z-index: 1;
    transition: all 0.6s ease;
}

.slide-controls label.signup {
    color: var(--slide-text-active);
}

.slide-controls .slider-tab {
    position: absolute;
    height: 100%;
    width: 50%;
    left: 0;
    z-index: 0;
    border-radius: 15px;
    background: var(--slide-tab);
    transition: all 0.6s cubic-bezier(0.68,-0.55,0.265,1.55);
}

input[type="radio"] {
    display: none;
}

#signup:checked ~ .slider-tab {
    left: 50%;
}

#signup:checked ~ label.signup {
    color: var(--slide-text);
}

#signup:checked ~ label.login {
    color: var(--slide-text-active);
}

.form-container {
    width: 100%;
    overflow: hidden;
}

.form-container .form-inner {
    display: flex;
    width: 200%;
    transition: all 0.6s cubic-bezier(0.68,-0.55,0.265,1.55);
}

.form-container .form-inner form {
    width: 50%;
    padding: 0 10px;
    transition: all 0.6s cubic-bezier(0.68,-0.55,0.265,1.55);
}

.form-inner form .field {
    height: 50px;
    width: 100%;
    margin-top: 20px;
}

.form-inner form .field input {
    width: 100%;
    height: 100%;
    outline: none;
    padding-left: 15px;
    border-radius: 15px;
    border: 1px solid var(--input-border);
    font-size: 17px;
}

.form-inner form .field input:focus {
    border-color: var(--input-focus);
}

.form-inner form .pass-link {
    margin-top: 5px;
}

.form-inner form .signup-link {
    text-align: center;
    margin-top: 30px;
    color: #000;
}

.form-inner form .pass-link a,
.form-inner form .signup-link a {
    color: #1a45a0;
    text-decoration: none;
}

.form-inner form .pass-link a:hover,
.form-inner form .signup-link a:hover {
    text-decoration: underline;
}

form .field.btn {
    height: 50px;
    width: 100%;
    border-radius: 15px;
    position: relative;
    overflow: hidden;
}

form .field.btn .btn-layer {
    height: 100%;
    width: 300%;
    position: absolute;
    left: -100%;
    background: linear-gradient(to right, #764ba2, #4385f5);
    transition: all 0.4s ease;
}

form .field.btn:hover .btn-layer {
    left: 0;
}

form .field.btn input[type="submit"] {
    height: 100%;
    width: 100%;
    z-index: 1;
    position: relative;
    background: none;
    border: none;
    color: #fff;
    font-size: 20px;
    font-weight: 500;
    cursor: pointer;
}