:root {
  --bg: #fafaf7; --fg: #1a1a18; --muted: #5f5e5a; --line: #dedbd2;
  --card: #ffffff; --accent: #0f6e56; --accent-fg: #ffffff; --accent-soft: #e1f5ee;
  --warn-bg: #faeeda; --warn-fg: #6b4a0c; --err: #a32d2d;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14150f; --fg: #ecebe4; --muted: #a9a79d; --line: #34352c;
    --card: #1d1e17; --accent: #3fc79e; --accent-fg: #06251b; --accent-soft: #123a2e;
    --warn-bg: #3a2c10; --warn-fg: #f2d79b; --err: #ff9a9a;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--fg); font: 16px/1.55 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif; }
.top, main, footer { max-width: 640px; margin: 0 auto; padding-left: 16px; padding-right: 16px; }
.top { padding-top: 16px; }
.brand { margin: 0; font-weight: 700; color: var(--accent); letter-spacing: .02em; }
main { padding-bottom: 8px; }
h1 { font-size: 1.7rem; line-height: 1.2; margin: 16px 0 8px; }
h2 { font-size: 1.15rem; margin: 28px 0 8px; }
.lead { font-size: 1.05rem; margin: 0 0 12px; }
.facts { padding-left: 1.2em; margin: 0 0 8px; color: var(--muted); }
.facts li { margin-bottom: 6px; }
.banner { background: var(--warn-bg); color: var(--warn-fg); border-radius: 10px; padding: 10px 14px; margin: 14px 0 0; font-weight: 600; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 16px; margin-top: 20px; }
.card h2 { margin-top: 0; }
label { display: block; font-weight: 600; margin-bottom: 6px; }
input { width: 100%; font: inherit; font-size: 1.1rem; padding: 12px; border-radius: 10px; border: 1px solid var(--line); background: var(--bg); color: var(--fg); }
input:focus-visible, .btn:focus-visible, a:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; }
.msg { margin: 8px 0 0; color: var(--muted); min-height: 1.5em; }
.msg.err { color: var(--err); }
.result { margin-top: 14px; border-top: 1px solid var(--line); padding-top: 14px; }
.tier-name { margin: 0; font-weight: 700; font-size: 1.1rem; }
.tier-price { margin: 2px 0 14px; font-size: 1.6rem; font-weight: 700; }
.muted { color: var(--muted); font-size: .95rem; font-weight: 400; }
.btn { display: block; text-align: center; background: var(--accent); color: var(--accent-fg); text-decoration: none; font-weight: 700; padding: 14px 16px; border-radius: 10px; min-height: 48px; }
.btn[aria-disabled="true"] { opacity: .5; pointer-events: none; }
.note { color: var(--muted); font-size: .95rem; margin: 10px 0 0; }
table { width: 100%; border-collapse: collapse; }
th, td { text-align: left; padding: 10px 8px; border-bottom: 1px solid var(--line); }
thead th { color: var(--muted); font-size: .9rem; font-weight: 600; }
tbody th { font-weight: 600; }
.n { text-align: right; font-variant-numeric: tabular-nums; }
ol { padding-left: 1.3em; } ol li { margin-bottom: 6px; }
a { color: var(--accent); }
.btn, .btn:visited { color: var(--accent-fg); }
footer { border-top: 1px solid var(--line); margin-top: 32px; padding-top: 16px; padding-bottom: 32px; color: var(--muted); font-size: .9rem; }
footer p { margin: 4px 0; }
.sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
@media (min-width: 640px) { h1 { font-size: 2rem; } .top, main, footer { padding-left: 24px; padding-right: 24px; } }