/* 聊天服務選擇頁 */
:root { color-scheme: light dark; --bg: #f5f5f7; --card: #fff; --border: #e3e3e8; --text: #1d1d1f; --muted: #6e6e73;
  --accent: #007aff; --ok: #248a3d; }
@media (prefers-color-scheme: dark) {
  :root { --bg: #1c1c1e; --card: #2c2c2e; --border: #3a3a3c; --text: #f5f5f7; --muted: #a1a1a6; --accent: #0a84ff; --ok: #30d158; }
}
* { box-sizing: border-box; }
html, body { margin: 0; background: var(--bg); color: var(--text); font: 14px -apple-system, BlinkMacSystemFont, "PingFang TC", sans-serif; }
main { max-width: 980px; margin: 0 auto; padding: 40px 32px; }
h1 { font-size: 28px; margin: 0 0 6px; }
.lead { color: var(--muted); margin: 0 0 26px; }
.services { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 18px; }
.card { background: var(--card); border: 1px solid var(--border); border-radius: 18px; padding: 24px 22px 20px;
  display: flex; flex-direction: column; align-items: flex-start; gap: 6px;
  box-shadow: 0 1px 2px rgba(0,0,0,.04), 0 6px 20px rgba(0,0,0,.05); }
.card.is-default { border-color: var(--accent); box-shadow: 0 0 0 1px var(--accent), 0 6px 20px rgba(0,0,0,.06); }
.logo { width: 56px; height: 56px; border-radius: 14px; display: grid; place-items: center; margin-bottom: 8px; }
.logo.builtin { background: #eaf3ff; }
.logo.builtin img { width: 40px; height: 40px; }
.logo.messenger { background: #06c755; }
.logo.messenger svg { width: 32px; height: 32px; }
.beta { font-size: 11px; font-weight: 600; background: #fff1d6; color: #8a5a00; border-radius: 6px; padding: 1px 6px; vertical-align: 3px; }
.logo.google { background: #e6f4ea; }
.logo.google svg { width: 36px; height: 36px; fill: #1e8e3e; }
.logo.google svg circle { fill: #fff; }
.logo.line { background: #06c755; color: #fff; font: 800 15px/1 -apple-system, sans-serif; letter-spacing: .5px; }
h2 { font-size: 18px; margin: 0; }
.card p { color: var(--muted); margin: 0 0 12px; line-height: 1.5; flex: 1; }
button { font: inherit; cursor: pointer; }
.primary { height: 36px; padding: 0 20px; border: none; border-radius: 10px; background: var(--accent); color: #fff; font-weight: 600; }
.primary:hover { filter: brightness(1.08); }
.link { border: none; background: none; color: var(--accent); padding: 6px 0 0; font-size: 13px; }
.primary:disabled { opacity: .55; cursor: default; filter: none; }
.desc-error { color: #d70015; }
.link:hover { text-decoration: underline; }
.default { margin-top: 28px; display: flex; align-items: center; gap: 12px; color: var(--muted); }
select { height: 32px; border: 1px solid var(--border); border-radius: 8px; padding: 0 10px; background: var(--card); color: var(--text); font: inherit; }
#saved { color: var(--ok); font-size: 13px; }