/* lunaluva.app — 共享样式。简洁亮色为主，自动跟随系统暗色。 */
:root {
  --bg: #ffffff;
  --bg-soft: #f5f6f8;
  --text: #1d2129;
  --text-2: #5c6370;
  --accent: #2563eb;
  --accent-dark: #1d4ed8;
  --border: #e5e7eb;
  --ok: #0a7d32;
  --warn: #b45309;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #101214;
    --bg-soft: #17191d;
    --text: #e8eaed;
    --text-2: #9aa0a6;
    --border: #2a2e33;
    --accent: #5b8def;
    --accent-dark: #7ba3f2;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Helvetica Neue", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  font-size: 16px;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
code { background: var(--bg-soft); padding: 2px 8px; border-radius: 6px; font-size: 0.95em; word-break: break-all; }

.nav {
  position: sticky; top: 0; z-index: 10;
  display: flex; align-items: center; gap: 20px;
  padding: 12px 20px;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.nav .brand { font-weight: 700; font-size: 17px; color: var(--text); }
.nav .brand:hover { text-decoration: none; }
.nav .links { display: flex; gap: 16px; margin-left: auto; flex-wrap: wrap; }
.nav .links a { color: var(--text-2); font-size: 14px; }
.nav .links a:hover { color: var(--text); }

.wrap { max-width: 980px; margin: 0 auto; padding: 0 20px; }
.hero { padding: 64px 0 40px; }
.hero h1 { font-size: 40px; line-height: 1.15; margin: 0 0 14px; letter-spacing: -0.02em; }
.hero .sub { font-size: 19px; color: var(--text-2); max-width: 640px; margin: 0 0 26px; }
h2 { font-size: 26px; margin: 44px 0 14px; letter-spacing: -0.01em; }
h3 { font-size: 18px; margin: 24px 0 8px; }
p.lead { font-size: 17px; color: var(--text-2); }

.btn {
  display: inline-block; padding: 11px 22px; border-radius: 10px;
  background: var(--accent); color: #fff; font-weight: 600; font-size: 15px;
  border: none; cursor: pointer;
}
.btn:hover { background: var(--accent-dark); text-decoration: none; color: #fff; }
.btn.secondary { background: var(--bg-soft); color: var(--text); border: 1px solid var(--border); }
.btn.secondary:hover { background: var(--border); }

.cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 18px; margin: 26px 0; }
.card {
  border: 1px solid var(--border); border-radius: 14px; padding: 22px;
  background: var(--bg);
}
.card .icon { width: 48px; height: 48px; border-radius: 12px; }
.card h3 { margin: 12px 0 6px; }
.card p { color: var(--text-2); font-size: 14px; margin: 0 0 14px; }

.feature-list { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 6px 26px; padding: 0; list-style: none; }
.feature-list li { padding: 7px 0; }
.feature-list li::before { content: "✓"; color: var(--ok); font-weight: 700; margin-right: 10px; }

table.cmp { border-collapse: collapse; width: 100%; margin: 18px 0; font-size: 14px; }
table.cmp th, table.cmp td { border: 1px solid var(--border); padding: 9px 12px; text-align: left; }
table.cmp th { background: var(--bg-soft); }
table.cmp td:not(:first-child) { text-align: center; }

.faq-item { border-bottom: 1px solid var(--border); padding: 14px 0; }
.faq-item h3 { margin: 0 0 6px; font-size: 16px; }
.faq-item p { margin: 0; color: var(--text-2); }

.form { max-width: 480px; margin: 20px 0; }
.form label { display: block; font-size: 13px; color: var(--text-2); margin: 14px 0 5px; }
.form input, .form textarea {
  width: 100%; padding: 10px 12px; border-radius: 9px;
  border: 1px solid var(--border); background: var(--bg); color: var(--text); font-size: 15px;
}
.form input:focus, .form textarea:focus { outline: 2px solid var(--accent); border-color: transparent; }
.form .hp { position: absolute; left: -9999px; }  /* honeypot */
.msg { padding: 12px 16px; border-radius: 9px; margin: 14px 0; display: none; }
.msg.ok { background: color-mix(in srgb, var(--ok) 12%, transparent); color: var(--ok); display: block; }
.msg.err { background: color-mix(in srgb, var(--warn) 12%, transparent); color: var(--warn); display: block; }
.qr-placeholder {
  width: 220px; height: 220px; border: 2px dashed var(--border); border-radius: 12px;
  display: flex; align-items: center; justify-content: center; text-align: center;
  color: var(--text-2); font-size: 13px; padding: 16px; margin: 14px 0;
}
.license-box { font-size: 22px; letter-spacing: 2px; background: var(--bg-soft); padding: 16px 20px; border-radius: 12px; margin: 12px 0; user-select: all; }

footer { border-top: 1px solid var(--border); margin-top: 70px; padding: 26px 20px 40px; }
footer .wrap { display: flex; gap: 22px; flex-wrap: wrap; font-size: 13px; color: var(--text-2); }
footer a { color: var(--text-2); }

@media (max-width: 640px) {
  .hero { padding: 40px 0 28px; }
  .hero h1 { font-size: 30px; }
  .nav { gap: 12px; padding: 10px 14px; }
  .nav .links { gap: 12px; }
  .nav .links a { font-size: 13px; }
}