:root {
  color-scheme: light;
  --ink: #18201d;
  --muted: #59635e;
  --paper: #f3f0e7;
  --card: #fffdf7;
  --line: #cdc8b9;
  --accent: #be4d2d;
  --deep: #174b42;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  background:
    linear-gradient(90deg, rgba(23, 75, 66, .06) 1px, transparent 1px) 0 0 / 32px 32px,
    var(--paper);
  color: var(--ink);
  font: 16px/1.55 system-ui, sans-serif;
}
.hero, main, footer { width: min(1100px, calc(100% - 2rem)); margin-inline: auto; }
.hero { padding: 5rem 0 2rem; max-width: 900px; margin-left: max(1rem, calc((100% - 1100px) / 2)); }
.eyebrow, .step { color: var(--accent); font-weight: 800; letter-spacing: .13em; text-transform: uppercase; font-size: .75rem; }
h1, h2 { font-family: Georgia, serif; line-height: 1.05; margin: 0 0 1rem; }
h1 { font-size: clamp(2.8rem, 7vw, 5.8rem); max-width: 12ch; }
h2 { font-size: 2rem; }
.hero > p:last-child { max-width: 65ch; color: var(--muted); font-size: 1.12rem; }
main { display: grid; grid-template-columns: 1.15fr .85fr; gap: 1rem; padding: 2rem 0; }
.panel { background: var(--card); border: 1px solid var(--line); padding: clamp(1.25rem, 3vw, 2.2rem); box-shadow: 5px 5px 0 rgba(23, 75, 66, .14); }
.builder { grid-row: span 2; }
label { display: block; font-weight: 750; margin: 1.2rem 0 .35rem; }
input { width: 100%; border: 1px solid var(--line); background: white; padding: .9rem; font: 700 1.08rem ui-monospace, monospace; color: var(--ink); }
input:focus { outline: 3px solid rgba(190, 77, 45, .25); border-color: var(--accent); }
.legend { display: grid; grid-template-columns: repeat(5, 1fr); color: var(--muted); font-size: .7rem; text-align: center; margin-top: .3rem; }
button { border: 1px solid var(--deep); background: var(--deep); color: white; font-weight: 750; padding: .75rem 1rem; cursor: pointer; }
form button { margin-top: 1rem; width: 100%; }
.presets { display: flex; flex-wrap: wrap; gap: .5rem; margin-top: 1rem; }
.presets button, #copy { background: transparent; color: var(--deep); }
button:hover { transform: translateY(-1px); }
#status[data-kind="error"] { color: #9b251b; }
#status[data-kind="success"] { color: var(--deep); }
#explanation { font: 700 1.05rem/1.7 ui-monospace, monospace; }
#preview { padding-left: 1.4rem; }
#preview li { padding: .35rem 0; border-bottom: 1px dotted var(--line); }
.warning { color: var(--muted); font-size: .88rem; margin-top: 1.5rem; }
footer { padding: 1rem 0 3rem; color: var(--muted); }
@media (max-width: 760px) {
  main { grid-template-columns: 1fr; }
  .hero { padding-top: 3rem; }
  h1 { font-size: clamp(2.6rem, 15vw, 4.5rem); }
}