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

html {
    min-height: 100%;
    font-size: 16px;
}

body {
    min-height: 100vh;
    margin: 0;
    color: var(--color-ink);
    font-family: Georgia, "Times New Roman", serif;
    line-height: 1.5;
    background-color: var(--color-paper);
    background-image: url("../assets/fond_aquarelle.png");
    background-attachment: fixed;
    background-position: center;
    background-repeat: no-repeat;
    background-size: cover;
}

h1,
h2,
h3,
p {
    margin-top: 0;
}

h1,
.title-primary {
    margin-bottom: 2rem;
    color: var(--color-ink);
    font-size: 3rem;
    font-weight: 700;
    line-height: 1.1;
}

a {
    color: var(--color-blue-800);
    text-decoration-thickness: 1px;
    text-underline-offset: 0.18em;
}

a:hover {
    color: var(--color-blue-700);
}

button,
input,
textarea,
select {
    font: inherit;
}

.page-center {
    display: grid;
    min-height: 100vh;
    place-items: center;
    padding: 2rem;
}

.form {
    width: min(100%, 31rem);
}

.form-field {
    display: grid;
    gap: 0.35rem;
    margin-bottom: 1.8rem;
}

.form-label {
    color: var(--color-ink);
    font-size: 1rem;
    font-weight: 700;
    letter-spacing: 0;
    text-transform: lowercase;
}

.form-control {
    width: 100%;
    min-height: 2.35rem;
    padding: 0.35rem 0.9rem;
    color: var(--color-ink);
    font-size: 0.95rem;
    font-weight: 700;
    text-align: center;
    background: var(--color-paper-glass);
    border: 1.5px solid var(--color-ink);
    border-radius: 4px;
    outline: 0;
    transition: border-color 160ms ease, box-shadow 160ms ease, background-color 160ms ease;
}

.form-control::placeholder {
    color: var(--color-placeholder);
    opacity: 1;
}

.form-control:focus {
    background: var(--color-paper-glass-active);
    border-color: var(--color-blue-700);
    box-shadow: 0 0 0 4px var(--color-focus);
}

.form-message {
    min-height: 1.5rem;
    margin: -0.4rem 0 1.2rem;
    font-size: 0.95rem;
    font-weight: 700;
    text-align: center;
}

.form-message.success {
    color: var(--color-success);
}

.form-message.error {
    color: var(--color-error);
}

.btn {
    display: inline-flex;
    min-height: 3.35rem;
    align-items: center;
    justify-content: center;
    padding: 0.6rem 2rem;
    color: var(--color-white);
    font-size: 1.35rem;
    font-weight: 700;
    line-height: 1;
    text-align: center;
    text-decoration: none;
    background: var(--color-blue-900);
    border: 0;
    border-radius: 8px;
    cursor: pointer;
    box-shadow: var(--shadow-soft);
    transition: transform 160ms ease, background-color 160ms ease, box-shadow 160ms ease;
}

.btn:hover {
    background: var(--color-blue-800);
    transform: translateY(-1px);
}

.btn:focus-visible {
    outline: 4px solid var(--color-focus);
    outline-offset: 3px;
}

.btn:disabled {
    cursor: wait;
    opacity: 0.7;
    transform: none;
}

.btn-primary {
    background: var(--color-blue-900);
}

@media (max-width: 520px) {
    .page-center {
        padding: 1.25rem;
    }

    .btn {
        width: 100%;
        font-size: 1.15rem;
    }

    h1,
    .title-primary {
        font-size: 2.35rem;
    }
}