/* A printer's proof sheet: white page, proof-red marks, an approval stamp. */
:root { --bg: #e9ecef; --sheet: #fff; --ink: #1b1f24; --soft: #59616b; --red: #c8322a; --green: #157a4a; --line: #d5dae0; }
@media (prefers-color-scheme: dark) { :root { --bg: #101317; --sheet: #1a1f26; --ink: #eef1f4; --soft: #a7b0bb; --red: #ff7a70; --green: #46c98a; --line: #333b45; } }
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 17px/1.5 -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif; -webkit-text-size-adjust: 100%; }
.sheet { position: relative; max-width: 36rem; margin: 0 auto; background: var(--sheet); min-height: 100vh; padding: calc(env(safe-area-inset-top, 0px) + 56px) 20px calc(env(safe-area-inset-bottom, 0px) + 28px); overflow: hidden; }
@media (min-width: 40rem) { .sheet { margin: 32px auto; min-height: 0; border: 1px solid var(--line); padding: 64px 40px 32px; } }
.stamp { position: absolute; top: 18px; right: 16px; margin: 0; transform: rotate(8deg); border: 3px solid var(--red); color: var(--red); border-radius: 6px; padding: 2px 12px;
  font: 800 1.3rem/1.2 ui-serif, Georgia, serif; text-transform: uppercase; letter-spacing: .06em; opacity: .9; transition: transform .35s cubic-bezier(.2,.9,.3,1.4), color .2s, border-color .2s; }
.stamp.ok { color: var(--green); border-color: var(--green); transform: rotate(-6deg) scale(1.15); }
h1 { font-size: 1.75rem; line-height: 1.15; margin: 0 0 6px; letter-spacing: -.015em; max-width: 15em; }
.biz { margin: 0 0 18px; color: var(--soft); font-size: 1.05rem; }
.open { display: flex; align-items: center; justify-content: center; min-height: 52px; border: 2px solid var(--ink); color: var(--ink); border-radius: 12px; font-weight: 700; text-decoration: none; }
.lead { color: var(--soft); }
.prev { background: color-mix(in srgb, var(--green) 12%, transparent); padding: 10px 12px; border-radius: 8px; }
fieldset { border: 0; padding: 0; margin: 18px 0 20px; display: grid; gap: 8px; }
legend { font-weight: 700; margin-bottom: 8px; }
.tick { display: flex; gap: 12px; align-items: flex-start; padding: 12px; border: 1.5px solid var(--line); border-radius: 10px; cursor: pointer; }
.tick input { width: 24px; height: 24px; margin: 0; flex: none; accent-color: var(--green); }
.tick:has(input:checked) { border-color: var(--green); }
.tick[aria-invalid="true"] { border-color: var(--red); }
label[for] { display: block; font-weight: 700; margin: 14px 0 6px; }
textarea, #who { width: 100%; font: inherit; font-size: 17px; color: var(--ink); background: var(--sheet); border: 1.5px solid var(--line); border-radius: 10px; padding: 12px; }
textarea:focus, #who:focus { outline: none; border-color: var(--ink); }
[aria-invalid="true"] { border-color: var(--red) !important; }
.trap { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }
.err { color: var(--red); font-weight: 600; min-height: 1.5em; margin: 12px 0 0; }
.btns { display: grid; gap: 10px; margin-top: 6px; }
button { font: inherit; font-weight: 700; min-height: 54px; border-radius: 12px; border: 0; cursor: pointer; transition: transform .12s; }
button:active { transform: scale(.98); }
button:disabled { opacity: .6; }
.go { background: var(--green); color: var(--sheet); }
.chg { background: transparent; color: var(--red); box-shadow: inset 0 0 0 2px var(--red); }
:focus-visible { outline: 3px solid var(--ink); outline-offset: 2px; }
footer { margin-top: 36px; padding-top: 14px; border-top: 1px solid var(--line); color: var(--soft); font-size: .9rem; }
a { color: inherit; }
@media (prefers-reduced-motion: reduce) { * { transition: none !important; } }