:root { color-scheme: light dark; --bg: #f6f6f4; --fg: #1b1b1b; --muted: #555; --err: #b00020; }
@media (prefers-color-scheme: dark) { :root { --bg: #121212; --fg: #ececec; --muted: #aaa; --err: #ff6b81; } }
html, body { margin: 0; background: var(--bg); color: var(--fg); font: 16px/1.5 system-ui, sans-serif; }
main { max-width: 760px; margin: 0 auto; padding: 16px; }
h1 { font-size: 1.1rem; margin: 0 0 12px; }
.message { margin: 12px 0; }
.message.error { color: var(--err); }
.message.info { color: var(--muted); font-size: .9rem; }
form { display: grid; gap: 12px; max-width: 320px; }
input { font-size: 1.2rem; padding: 10px; width: 100%; box-sizing: border-box; letter-spacing: .2em; text-transform: uppercase; }
button { font-size: 1rem; padding: 10px 14px; }
.actions { display: flex; align-items: center; gap: 12px; margin: 0 0 12px; flex-wrap: wrap; }
.actions #save { font-weight: 600; }
.actions p { margin: 0; color: var(--err); font-size: .9rem; }
#pages canvas { display: block; width: 100%; height: auto; margin: 0 0 12px; user-select: none; -webkit-user-select: none; -webkit-touch-callout: none; }
@media print { #pages { display: none; } body::after { content: "This document cannot be printed."; } }