:root {
    --main-bg-color: #8ebcfe;
    --box-bg-color: #ffffff;
    --accent-blue: #2563eb;
    --accent-blue-hover: #1d4ed8;
    --error-red: #e63946;
    --text-dark: #0d2a4c;
}
body {
    margin: 0;
    padding: 0;
    background-color: var(--main-bg-color);
    font-family: "Segoe UI", sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
}
.auth-container {
    width: 380px;
    background: var(--box-bg-color);
    padding: 30px;
    border-radius: 14px;
    box-shadow: 0 8px 18px rgba(0,0,0,0.15);
    border: 3px solid #6EA8F7;
}
h1 {
    text-align: center;
    margin-bottom: 25px;
    color: var(--text-dark);
}
.error {
    background: rgba(230, 57, 70, 0.15);
    padding: 10px;
    border-left: 4px solid var(--error-red);
    color: var(--error-red);
    margin-bottom: 20px;
    border-radius: 6px;
    font-weight: 600;
}
/* Form */
.auth-form {
    display: flex;
    flex-direction: column;
    gap: 18px;
}
.auth-form label {
    font-weight: 600;
    color: var(--text-dark);
}
.auth-form input {
    padding: 10px 12px;
    border-radius: 8px;
    border: 1px solid #93c5fd;
    font-size: 15px;
    transition: 0.25s;
}
.auth-form input:focus {
    border-color: var(--accent-blue);
    box-shadow: 0 0 6px rgba(37, 99, 235, 0.4);
}
/* Button */
button {
    margin-top: 10px;
    padding: 12px;
    background: var(--accent-blue);
    border: none;
    color: white;
    font-size: 17px;
    border-radius: 10px;
    cursor: pointer;
    transition: 0.25s;
}
button:hover {
    background: var(--accent-blue-hover);
    transform: scale(1.02);
}
/* Bottom link */
.auth-link {
    text-align: center;
    margin-top: 15px;
    color: var(--text-dark);
}
.auth-link a {
    color: var(--accent-blue);
    text-decoration: none;
    font-weight: 600;
}
.auth-link a:hover {
    text-decoration: underline;
}