:root {
    --indigo-900: #1E1B4B;
    --indigo-700: #4338CA;
    --indigo-600: #4F46E5;
    --indigo-300: #C7D2FE;
    --indigo-100: #EEF0FF;
    --white: #FFFFFF;
    --red-600: #DC2626;
    --font-display: 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
    --font-body: 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
}

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

body {
    min-height: 100vh;
    font-family: var(--font-body);
    color: var(--indigo-900);
    background:
        radial-gradient(circle at 15% 20%, var(--indigo-100) 0%, transparent 45%),
        radial-gradient(circle at 85% 80%, var(--indigo-100) 0%, transparent 45%),
        var(--white);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
}

.page {
    width: 100%;
    display: flex;
    justify-content: center;
}

.card {
    position: relative;
    width: 100%;
    max-width: 420px;
    background: var(--white);
    border: 1px solid var(--indigo-100);
    border-radius: 24px;
    padding: 48px 40px;
    box-shadow: 0 30px 60px -20px rgba(67, 56, 202, 0.18);
    overflow: hidden;
}

/* Chain-link motif echoing the favicon */
.card::before {
    content: "";
    position: absolute;
    top: -55px;
    right: -55px;
    width: 150px;
    height: 150px;
    border: 13px solid var(--indigo-300);
    border-radius: 50%;
    opacity: 0.3;
}

.card::after {
    content: "";
    position: absolute;
    bottom: -60px;
    left: -45px;
    width: 120px;
    height: 120px;
    border: 13px solid var(--indigo-100);
    border-radius: 50%;
}

.card>* {
    position: relative;
    z-index: 1;
}

h1 {
    font-family: var(--font-display);
    font-size: 1.9rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    text-align: center;
    margin-bottom: 32px;
}

/* Form */
.auth-form {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.auth-form label {
    font-weight: 500;
    font-size: 0.85rem;
    color: #52527A;
    margin-top: 14px;
}

.auth-form input[type="text"],
.auth-form input[type="password"] {
    padding: 13px 16px;
    border: 2px solid var(--indigo-100);
    border-radius: 12px;
    font-family: var(--font-body);
    font-size: 0.95rem;
    color: var(--indigo-900);
    outline: none;
    transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.auth-form input[type="text"]:focus,
.auth-form input[type="password"]:focus {
    border-color: var(--indigo-600);
    box-shadow: 0 0 0 3px var(--indigo-100);
}

.auth-form input[type="submit"] {
    margin-top: 26px;
    background: var(--indigo-600);
    color: var(--white);
    border: none;
    padding: 14px;
    border-radius: 999px;
    font-family: var(--font-display);
    font-weight: 600;
    font-size: 0.95rem;
    cursor: pointer;
    box-shadow: 0 10px 20px -8px rgba(79, 70, 229, 0.55);
    transition: transform 0.15s ease, background 0.15s ease, box-shadow 0.15s ease;
}

.auth-form input[type="submit"]:hover {
    background: var(--indigo-700);
    transform: translateY(-2px);
    box-shadow: 0 14px 24px -8px rgba(79, 70, 229, 0.6);
}

/* Message (e.g. error/success) */
.msg {
    margin-top: 20px;
    padding: 12px 16px;
    background: var(--indigo-100);
    border: 1px solid var(--indigo-300);
    border-radius: 12px;
    text-align: center;
}

.msg p {
    font-size: 0.9rem;
    color: var(--indigo-700);
    font-weight: 500;
}

/* Switch to signup link */
.switch {
    margin-top: 24px;
    text-align: center;
    font-size: 0.88rem;
    color: #52527A;
}

.switch a {
    color: var(--indigo-600);
    font-weight: 600;
    text-decoration: none;
}

.switch a:hover {
    text-decoration: underline;
}

@media (max-width: 480px) {
    .card {
        padding: 36px 24px;
    }
}