:root {
  --bg: #0f0f1a;
  --card: #1a1a2e;
  --text: #e8e8f0;
  --muted: #888;
  --accent: #ff6b35;
  --border: #2a2a40;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC",
               "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", sans-serif;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
nav { border-bottom: 1px solid var(--border); }
nav .inner {
  max-width: 960px; margin: 0 auto;
  padding: 16px 24px;
  display: flex; align-items: center; justify-content: space-between;
  flex-wrap: wrap; gap: 16px;
}
nav .brand { color: #fff; font-weight: 800; font-size: 18px; text-decoration: none; }
nav .links { display: flex; gap: 20px; align-items: center; }
nav .links a { color: var(--muted); text-decoration: none; font-size: 14px; }
nav .links a:hover { color: var(--accent); }
nav .lang-picker {
  background: var(--card);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 6px 10px;
  font-size: 13px;
  cursor: pointer;
}
main { max-width: 720px; margin: 0 auto; padding: 48px 24px 80px; }
h1 { font-size: 28px; margin: 0 0 8px; color: #fff; }
h2 { font-size: 18px; margin: 36px 0 12px; color: var(--accent); }
.meta { color: var(--muted); font-size: 13px; margin-bottom: 32px; }
p, li { color: var(--text); font-size: 15px; }
ul { padding-left: 22px; }
li { margin-bottom: 6px; }
.card { background: var(--card); border: 1px solid var(--border); border-radius: 14px; padding: 20px 24px; margin: 16px 0 24px; }
.card p:first-child { margin-top: 0; }
.card p:last-child { margin-bottom: 0; }
code { background: #12121f; padding: 2px 6px; border-radius: 4px; font-size: 13px; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
hr { border: none; border-top: 1px solid var(--border); margin: 32px 0; }
footer { color: var(--muted); font-size: 13px; text-align: center; margin-top: 48px; }

/* Index hero / features */
section.hero { max-width: 720px; margin: 0 auto; padding: 64px 24px 32px; }
section.hero .badge { display: inline-block; padding: 4px 10px; border-radius: 99px;
  background: var(--card); border: 1px solid var(--border); color: var(--muted); font-size: 12px; }
section.hero h1 { font-size: 42px; line-height: 1.2; margin: 16px 0 12px; }
section.hero .tagline { color: var(--muted); font-size: 17px; }
section.features { max-width: 720px; margin: 0 auto; padding: 32px 24px;
  display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
@media (max-width: 600px) { section.features { grid-template-columns: 1fr; } }
.feat { background: var(--card); border: 1px solid var(--border); border-radius: 14px; padding: 20px; }
.feat h3 { color: #fff; font-size: 16px; margin: 0 0 6px; }
.feat p { color: var(--muted); font-size: 14px; line-height: 1.6; margin: 0; }
.principles { background: var(--card); border-radius: 16px; padding: 28px; margin: 0 auto 48px; max-width: 720px; }
.principles h2 { color: #fff; font-size: 20px; margin: 0 0 16px; }
.principles ul { margin: 0; padding-left: 22px; }
.principles li { margin-bottom: 8px; color: var(--text); }
.principles li strong { color: var(--accent); }