:root {
    color-scheme: light;
    font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    color: #17222a;
    background: #edf3f1;
}

* {
    box-sizing: border-box;
}

body {
    min-height: 100vh;
    margin: 0;
    background:
        radial-gradient(circle at 15% 15%, rgb(255 255 255 / 90%), transparent 32rem),
        linear-gradient(145deg, #edf3f1 0%, #dce8e3 100%);
}

.shell {
    display: grid;
    min-height: 100vh;
    place-items: center;
    padding: 2rem 1.25rem;
}

.card {
    width: min(100%, 42rem);
    padding: clamp(2rem, 6vw, 4rem);
    border: 1px solid rgb(23 34 42 / 10%);
    border-radius: 1.5rem;
    background: rgb(255 255 255 / 88%);
    box-shadow: 0 1.5rem 4rem rgb(33 69 57 / 14%);
    backdrop-filter: blur(1rem);
}

.eyebrow {
    margin-bottom: 0.75rem;
    color: #267358;
    font-size: 0.75rem;
    font-weight: 800;
    letter-spacing: 0.14em;
    text-transform: uppercase;
}

h1 {
    max-width: 12ch;
    margin: 0;
    font-size: clamp(2.25rem, 8vw, 4.75rem);
    font-weight: 750;
    letter-spacing: -0.055em;
    line-height: 0.96;
}

.intro {
    max-width: 58ch;
    margin: 1.5rem 0 2rem;
    color: #54636a;
    font-size: 1.05rem;
    line-height: 1.65;
}

.notice {
    margin-bottom: 1.5rem;
    padding: 0.95rem 1rem;
    border-radius: 0.8rem;
    font-weight: 650;
    line-height: 1.45;
}

.notice--success {
    color: #145b42;
    background: #dff6eb;
}

.notice--error {
    color: #842f2f;
    background: #fde9e7;
}

.demo-form {
    display: grid;
    gap: 1rem;
}

label {
    font-size: 0.9rem;
    font-weight: 700;
}

input {
    width: 100%;
    min-height: 3.25rem;
    padding: 0 1rem;
    border: 1px solid #b8c7c1;
    border-radius: 0.75rem;
    color: inherit;
    background: #fff;
    font: inherit;
}

input:focus-visible,
button:focus-visible {
    outline: 3px solid rgb(38 115 88 / 32%);
    outline-offset: 2px;
}

altcha-widget {
    width: 100%;
}

button {
    min-height: 3.25rem;
    border: 0;
    border-radius: 0.75rem;
    color: #fff;
    background: #17222a;
    font: inherit;
    font-weight: 750;
    cursor: pointer;
    transition: transform 150ms ease, background 150ms ease;
}

button:hover {
    background: #267358;
    transform: translateY(-1px);
}

.privacy {
    margin: 1.5rem 0 0;
    color: #738087;
    font-size: 0.82rem;
    line-height: 1.55;
}

@media (max-width: 34rem) {
    .card {
        padding: 1.5rem;
        border-radius: 1rem;
    }
}