:root {
    color-scheme: light;
    font-family: Inter, system-ui, "Malgun Gothic", sans-serif;
    color: #17223b;
    background: #f2f5fb;
}

* { box-sizing: border-box; }

body { margin: 0; }

main {
    display: grid;
    grid-template-columns: minmax(0, 3fr) minmax(0, 4fr);
    align-items: start;
    gap: clamp(2rem, 6vw, 5rem);
    max-width: 66rem;
    margin: 0 auto;
    padding: clamp(2rem, 8vw, 7rem) clamp(1rem, 4vw, 2.5rem);
}

.intro { padding-top: 1.25rem; }
.product { color: #214ca3; font-weight: 700; }
h1 { font-size: clamp(2.25rem, 5vw, 3.5rem); letter-spacing: -0.06em; margin: 0; }
.intro p { line-height: 1.65; }
.hint { color: #4d5b74; font-size: 0.9rem; }

form {
    display: grid;
    gap: 0.55rem;
    padding: clamp(1.25rem, 3vw, 2rem);
    border: 1px solid #d6dfed;
    border-radius: 1.25rem;
    background: #fff;
}

h2 { margin: 0 0 0.35rem; font-size: 1.25rem; }
label { margin-top: 0.55rem; font-weight: 650; }
input:not([type="hidden"]), textarea, button { font: inherit; }
input:not([type="hidden"]), textarea {
    width: 100%;
    min-width: 0;
    color: inherit;
    background: #fff;
    border: 1px solid #97a6bf;
    border-radius: 0.65rem;
    padding: 0.75rem;
}

textarea { resize: vertical; }
button {
    margin-top: 0.8rem;
    padding: 0.85rem 1rem;
    color: #fff;
    background: #204fb5;
    border: 0;
    border-radius: 0.65rem;
    font-weight: 700;
    cursor: pointer;
}

button:hover { background: #153d95; }
:focus-visible { outline: 3px solid #2964da; outline-offset: 2px; }
.notice { margin: 0; padding: 0.75rem 1rem; border-radius: 0.65rem; line-height: 1.5; }
.success { color: #1f6245; background: #e8f6ef; }
.error { padding-left: 2rem; color: #922c2c; background: #fff1f1; }

@media (max-width: 46rem) {
    main { grid-template-columns: minmax(0, 1fr); gap: 1.25rem; }
    .intro { padding-top: 0; }
}