body {
    --color-primary: var(--accent);
    --color-primary-dark: var(--accent-hover);
    --color-secondary: var(--accent);
    --color-error: var(--bad-ink);
    --color-success: var(--ok-ink);
    --border-radius: 4px;

    margin: 0;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    color: var(--ink);
    background: var(--canvas);

}

.container {
    width: 400px;
    max-width: 400px;
    margin: 1rem;
    padding: 2rem;
    border: 1px solid var(--border);
    box-shadow: var(--shadow);
    /* Same card shape as the calculator's panels */
    border-radius: var(--radius);
    background: var(--surface);

}

.container,
.form__input,
.form__button {
    font: 500 1rem 'Quicksand', sans-serif;
}

.form--hidden {
    display: none;
}

.form > *:first-child {
    margin-top: 0;
}

.form > *:last-child {
    margin-bottom: 0;
}

.form__title {
    margin-bottom: 0rem;
    text-align: center;
}

.form__message {
    text-align: center;
    margin-bottom: 1rem;
}

.form__message--success {
    color: var(--color-success);
}

.form__message--error {
    color: var(--color-error);
}

.form__input-group {
    margin-bottom: 1rem;
}

.form__input {
    display: block;
    width: 100%;
    padding: 0.75rem;
    box-sizing: border-box;
    border-radius: var(--border-radius);
    color: var(--ink);
    border: 1px solid var(--border-strong);
    background: var(--surface-sunken);
    transition: background 0.2s, border-color 0.2s;

}

.form__input:focus {
    border-color: var(--color-primary);
    background: var(--surface);
}

.form__input--error {
    color: var(--color-error);
    border-color: var(--color-error);
}

.form__input-error-message {
    margin-top: 0.5rem;
    font-size: 0.85rem;
    color: var(--color-error);
}

.form__button {
    width: 100%;
    padding: 1rem 2rem;
    font-weight: bold;
    font-size: 1.1rem;
    color: #ffffff;
    border: none;
    border-radius: var(--border-radius);
    outline: none;
    cursor: pointer;
    background: var(--color-primary);
}

.form__button:hover {
    background: var(--color-primary-dark);
}

.form__button:active {
    transform: scale(0.98);
}

.form__text {
    text-align: center;
}

.form__link {
    color: var(--color-secondary);
    text-decoration: none;
    cursor: pointer;
}

.form__link:hover {
    text-decoration: underline;
}
.form__note {
    margin-top: 0.75rem;
    font-size: 0.85rem;
    color: var(--ink-2);
}

/* Terms of Use checkbox on the sign-up form */
.form__check {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  margin: 0 0 1rem;
  font-size: 0.95rem;
  text-align: left;
}
.form__check input {
  margin-top: 3px;
}