/* SEO landing pages (public/<slug>/index.html). Static on purpose: Google reads
   them without running the SPA. See seo/plan.md. */
:root {
  --ink: #1b2233; --muted: #5d6578; --navy: #1f2d5c; --blue: #2f6fec; --line: #dfe3ee;
  --bg: #ffffff; --soft: #f4f6fb; --bubble-ai: #eef2fb; --bubble-me: #2f6fec; --en: #1f5fd6;
}
@media (prefers-color-scheme: dark) {
  :root {
    --ink: #e7eaf3; --muted: #a3aac0; --navy: #a9bdf5; --blue: #5b8cf5; --line: #2c3450;
    --bg: #10131c; --soft: #181d2b; --bubble-ai: #1e2538; --bubble-me: #3d6fe0; --en: #8fb0ff;
  }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 17px/1.7 -apple-system, "Segoe UI", Roboto, Arial, sans-serif; }
header.top { border-bottom: 1px solid var(--line); }
header.top div { max-width: 760px; margin: 0 auto; padding: 12px 16px; display: flex; align-items: center; justify-content: space-between; gap: 12px; }
header.top a.brand { font-weight: 800; color: var(--navy); text-decoration: none; font-size: 1.1rem; display: flex; align-items: center; gap: 8px; }
header.top a.brand img { width: 28px; height: 28px; border-radius: 7px; }
main { max-width: 760px; margin: 0 auto; padding: 28px 16px 56px; }
h1 { color: var(--navy); font-size: 1.9rem; line-height: 1.25; margin: 0 0 12px; }
h2 { color: var(--navy); font-size: 1.35rem; line-height: 1.3; margin: 36px 0 10px; }
h3 { font-size: 1.08rem; margin: 22px 0 6px; }
p, li { margin: 0 0 12px; }
ul, ol { padding-left: 22px; }
a { color: var(--blue); }
.lead { font-size: 1.1rem; color: var(--muted); }
.meta { color: var(--muted); font-size: .9rem; margin-bottom: 20px; }
.cta { display: inline-block; background: var(--blue); color: #fff; font-weight: 700; text-decoration: none; padding: 12px 22px; border-radius: 999px; margin: 6px 0 4px; }
.cta.small { padding: 7px 16px; font-size: .95rem; margin: 0; }
.cta-box { background: var(--soft); border: 1px solid var(--line); border-radius: 16px; padding: 18px 20px; margin: 28px 0; }
.cta-box p { margin-bottom: 10px; }
.box { background: var(--soft); border: 1px solid var(--line); border-radius: 12px; padding: 12px 16px; margin: 16px 0; }
.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: .95rem; margin: 8px 0 16px; }
th, td { border: 1px solid var(--line); padding: 8px 10px; text-align: left; vertical-align: top; }
th { background: var(--soft); }
/* A sample chat, written as text so Google can read it. */
.chat { border: 1px solid var(--line); border-radius: 18px; padding: 16px; margin: 20px 0; background: var(--bg); }
.chat .who { display: flex; align-items: center; gap: 10px; font-weight: 700; margin-bottom: 12px; }
.chat .who img { width: 40px; height: 40px; border-radius: 50%; object-fit: cover; }
.chat .who small { display: block; font-weight: 400; color: var(--muted); font-size: .8rem; }
.msg { max-width: 85%; padding: 9px 13px; border-radius: 16px; margin: 0 0 8px; font-size: .97rem; line-height: 1.5; }
.msg.ai { background: var(--bubble-ai); border-bottom-left-radius: 4px; }
.msg.me { background: var(--bubble-me); color: #fff; margin-left: auto; border-bottom-right-radius: 4px; }
.msg .en { display: block; color: var(--en); font-size: .9rem; margin-top: 3px; }
.msg.me .en { color: #dbe6ff; }
.tip { font-size: .85rem; color: var(--muted); margin: 4px 0 0; }
details { border-bottom: 1px solid var(--line); padding: 10px 0; }
summary { font-weight: 700; cursor: pointer; }
details p { margin: 8px 0 0; }
footer { border-top: 1px solid var(--line); margin-top: 44px; padding-top: 16px; color: var(--muted); font-size: .9rem; }
footer a { margin-right: 14px; }