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

body {
    background-color: #f3f4f6;
    font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #111827;
}

.login-wrapper {
    width: 100%;
    padding: 1rem;
}

.login-card {
    background: #ffffff;
    border: 1px solid #e5e7eb;
    border-radius: 8px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
    max-width: 420px;
    margin: 0 auto;
    padding: 2.5rem 2rem;
}

.login-title {
    font-size: 1.375rem;
    font-weight: 600;
    text-align: center;
    margin-bottom: 1.75rem;
    color: #111827;
}

/* General error messages */
.error-summary {
    background-color: #fef2f2;
    border: 1px solid #fecaca;
    border-radius: 6px;
    color: #b91c1c;
    font-size: 0.875rem;
    padding: 0.75rem 1rem;
    margin-bottom: 1.25rem;
}

.error-summary span {
    display: block;
}

/* Form layout */
.form-group {
    display: flex;
    flex-direction: column;
    margin-bottom: 1.125rem;
}

.form-group label {
    font-size: 0.875rem;
    font-weight: 500;
    color: #374151;
    margin-bottom: 0.375rem;
}

.form-group input[type="text"],
.form-group input[type="password"],
.form-group input[type="email"] {
    border: 1px solid #d1d5db;
    border-radius: 6px;
    color: #111827;
    font-size: 0.9375rem;
    padding: 0.5rem 0.75rem;
    width: 100%;
    background: #ffffff;
    outline: none;
    transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.form-group input[type="text"]:focus,
.form-group input[type="password"]:focus,
.form-group input[type="email"]:focus {
    border-color: #6b7280;
    box-shadow: 0 0 0 3px rgba(107, 114, 128, 0.15);
}

.form-group input.input-validation-error {
    border-color: #ef4444;
}

.form-group input.input-validation-error:focus {
    box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.15);
}

/* Per-field validation messages */
.field-error {
    color: #b91c1c;
    font-size: 0.8125rem;
    margin-top: 0.3125rem;
    min-height: 1.125rem;
}

/* Remember-me checkbox row */
.form-group--checkbox {
    flex-direction: row;
    align-items: center;
    margin-bottom: 1.5rem;
}

.form-group--checkbox label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 400;
    cursor: pointer;
    margin-bottom: 0;
    user-select: none;
}

.form-group--checkbox input[type="checkbox"] {
    width: 1rem;
    height: 1rem;
    cursor: pointer;
    flex-shrink: 0;
    accent-color: #374151;
}

/* Submit button */
.btn-submit {
    display: block;
    width: 100%;
    background-color: #1f2937;
    color: #ffffff;
    border: none;
    border-radius: 6px;
    font-size: 0.9375rem;
    font-weight: 500;
    padding: 0.625rem 1rem;
    cursor: pointer;
    transition: background-color 0.15s ease;
}

.btn-submit:hover {
    background-color: #374151;
}

.btn-submit:focus-visible {
    outline: 2px solid #6b7280;
    outline-offset: 2px;
}

/* Forgot password link */
.link-forgot-password {
    display: block;
    text-align: center;
    margin-top: 1rem;
    font-size: 0.875rem;
    color: #6b7280;
    text-decoration: none;
}

.link-forgot-password:hover {
    color: #111827;
    text-decoration: underline;
}

/* Dark mode */
@media (prefers-color-scheme: dark) {
    body {
        background-color: #111827;
        color: #f9fafb;
    }

    .login-card {
        background: #1f2937;
        border-color: #374151;
        box-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
    }

    .login-title {
        color: #f9fafb;
    }

    .error-summary {
        background-color: #450a0a;
        border-color: #991b1b;
        color: #fca5a5;
    }

    .form-group label {
        color: #d1d5db;
    }

    .form-group input[type="text"],
    .form-group input[type="password"],
    .form-group input[type="email"] {
        background: #374151;
        border-color: #4b5563;
        color: #f9fafb;
    }

    .form-group input[type="text"]:focus,
    .form-group input[type="password"]:focus,
    .form-group input[type="email"]:focus {
        border-color: #9ca3af;
        box-shadow: 0 0 0 3px rgba(156, 163, 175, 0.2);
    }

    .form-group input.input-validation-error {
        border-color: #f87171;
    }

    .form-group input.input-validation-error:focus {
        box-shadow: 0 0 0 3px rgba(248, 113, 113, 0.2);
    }

    .field-error {
        color: #fca5a5;
    }

    .form-group--checkbox input[type="checkbox"] {
        accent-color: #9ca3af;
    }

    .btn-submit {
        background-color: #e5e7eb;
        color: #111827;
    }

    .btn-submit:hover {
        background-color: #f9fafb;
    }

    .btn-submit:focus-visible {
        outline-color: #9ca3af;
    }

    .link-forgot-password {
        color: #9ca3af;
    }

    .link-forgot-password:hover {
        color: #f9fafb;
    }
}