:root {
    --form-bg: oklch(44.6% 0.03 256.802);
    --font-color: oklch(92.8% 0.006 264.531);
    --gray700: oklch(37.3% 0.034 259.733);
    --gray800: oklch(27.8% 0.033 256.848);
    --gray900: oklch(21% 0.034 264.665);
    --errorColor: oklch(63.7% 0.237 25.331);
    --successColor: oklch(69.6% 0.17 162.48);
}

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

body {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background: linear-gradient(45deg, var(--gray900), var(--gray800), var(--gray700));
}

.form {
    display: flex;
    align-items: center;
    width: 95%;
    max-width: 600px;
    height: 90vh;
    flex-direction: column;
    background-color: var(--form-bg);
    border-radius: 25px;
    box-shadow: 5px 5px 20px var(--font-color);
}

.form h1 {
    margin-top: 15px;
    text-align: center;
    color: var(--font-color);
    font-size: 30px;
    font-weight: 900;
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, "Open Sans", "Helvetica Neue", sans-serif;
    margin-bottom: 50px;
}

.form h1:after {
    content: "";
    width: 90%;
    height: 4px;
    background-color: var(--gray700);
    display: block;
    margin: 8px auto 0;
    border-radius: 2px;
}

.form-group {
    display: flex;
    flex-direction: column;
    text-align: start;
    margin-top: 5px;
    margin-bottom: 5px;
    width: 100%;
    padding: 2%;
}

.form .form-group label {
    color: var(--font-color);
    font-weight: bolder;
    font-size: 19px;
    margin-bottom: 3px;
    margin-left: 5px;
}

.form .form-group input {
    padding: 1.5%;
    border-radius: 5px;
    border: none;
    color: var(--gray700);
    font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
    font-size: 15px;
}

.form .form-group input:focus {
    outline: 2px solid var(--font-color);
    background-color: #f0f4ff;
    transition: all 0.5s ease;
}

.form button {
    padding: 1.5%;
    width: 60%;
    border-radius: 15px;
    font-size: 20px;
    color: white;
    border: none;
    margin-bottom: 15px;
    background-color: var(--gray700);
    box-shadow: 2px 2px 20px var(--gray800);
    transition: background 0.5s ease, color 0.9s ease;
    font-weight: 900;
    cursor: pointer;
    margin-top: 10px;
}

.form button:hover {
    background-color: var(--font-color);
    box-shadow: 3px 3px 20px var(--font-color);
    color: var(--gray900);
}

small {
    color: var(--errorColor);
    margin-top: 5px;
    margin-left: 5px;
    font-size: 14px;
    font-family: monospace;
    font-weight: 800;
    font-style: italic;
}

p {
    font-size: larger;
    font-weight: 800;
    font-style: italic;
    font-family: monospace;
    font-size: 14px;
    margin-top: 15px;
    color: var(--successColor);
}

input.error {
    border: 2px solid var(--errorColor);
    background-color: #fff0f0;
}

input.success {
    border: 2px solid var(--successColor);
    background-color: #f0fff4;
}

@media (max-width: 992px) {
    .form {
        height: auto;
        min-height: 90vh;
        padding-bottom: 20px;
    }

    .form h1 {
        font-size: 26px;
        margin-bottom: 35px;
    }

    .form .form-group label {
        font-size: 17px;
    }

    .form .form-group input {
        padding: 2%;
        font-size: 14px;
    }

    .form button {
        width: 65%;
        font-size: 18px;
        padding: 2%;
    }
}

@media (max-width: 768px) {
    body {
        align-items: flex-start;
        padding: 20px 0;
    }

    .form {
        width: 92%;
        border-radius: 20px;
        min-height: auto;
        height: auto;
        padding-bottom: 25px;
    }

    .form h1 {
        font-size: 22px;
        margin-top: 20px;
        margin-bottom: 25px;
    }

    .form-group {
        padding: 3%;
        margin-top: 2px;
        margin-bottom: 2px;
    }

    .form .form-group label {
        font-size: 15px;
    }

    .form .form-group input {
        padding: 8px 10px;
        font-size: 14px;
        border-radius: 6px;
    }

    .form button {
        width: 70%;
        font-size: 16px;
        padding: 10px;
        border-radius: 12px;
        margin-top: 10px;
    }

    small {
        font-size: 12px;
    }

    p {
        font-size: 13px;
        margin-top: 10px;
        text-align: center;
        padding: 0 10px;
    }
}

@media (max-width: 576px) {
    body {
        padding: 15px 0;
    }

    .form {
        width: 95%;
        border-radius: 16px;
        box-shadow: 3px 3px 12px var(--font-color);
    }

    .form h1 {
        font-size: 19px;
        margin-top: 18px;
        margin-bottom: 18px;
    }

    .form h1:after {
        height: 3px;
    }

    .form-group {
        padding: 3% 4%;
    }

    .form .form-group label {
        font-size: 14px;
    }

    .form .form-group input {
        padding: 9px 10px;
        font-size: 13px;
    }

    .form button {
        width: 78%;
        font-size: 15px;
        padding: 10px;
    }

    small {
        font-size: 11px;
    }

    p {
        font-size: 12px;
        padding: 0 15px;
        text-align: center;
    }
}

@media (max-width: 400px) {
    .form {
        width: 98%;
        border-radius: 14px;
    }

    .form h1 {
        font-size: 17px;
        margin-bottom: 15px;
    }

    .form .form-group label {
        font-size: 13px;
    }

    .form .form-group input {
        font-size: 12px;
        padding: 8px;
    }

    .form button {
        width: 85%;
        font-size: 14px;
        padding: 9px;
    }

    small {
        font-size: 10px;
    }

    p {
        font-size: 11px;
    }
}