/* 萤火虫大模型官网 — 极简浅色版 */

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
ul { margin: 0; padding: 0; list-style: none; }
a { color: inherit; text-decoration: none; }
a:hover { text-decoration: underline; }

/* ---------- 变量 ---------- */
:root {
  --bg: #ffffff;
  --bg-soft: #f7f8fa;
  --text: #1a1d24;
  --text-soft: #4a5060;
  --border: #e4e7ec;
  --primary: #ff7a18;       /* 火苗橙 */
  --primary-hover: #e86a10;
  --radius: 8px;
  --max-w: 720px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
          "Hiragino Sans GB", "Microsoft YaHei", Roboto, Helvetica, Arial, sans-serif;
}

/* ---------- 基础 ---------- */
body {
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.7;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ---------- Header ---------- */
header {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 24px 20px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
header .logo {
  font-weight: 700;
  font-size: 18px;
  color: var(--primary);
  letter-spacing: 0.02em;
}
header nav { display: flex; gap: 20px; }
header nav a {
  color: var(--text-soft);
  font-size: 14px;
  transition: color 0.15s;
}
header nav a:hover { color: var(--primary); text-decoration: none; }

/* ---------- Main ---------- */
main {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 40px 20px 60px;
}

/* ---------- Hero ---------- */
.hero { text-align: center; padding: 40px 0 32px; }
.hero h1 {
  font-size: 42px;
  line-height: 1.25;
  margin: 0 0 16px;
  letter-spacing: -0.01em;
}
.hero .sub {
  font-size: 18px;
  color: var(--text-soft);
  margin: 0 0 10px;
}
.hero .meta {
  font-size: 14px;
  color: #6b7280;
  margin: 0 0 28px;
}
.cta { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-block;
  padding: 11px 24px;
  border-radius: var(--radius);
  font-size: 15px;
  font-weight: 600;
  background: var(--primary);
  color: #fff;
  border: 1px solid var(--primary);
  transition: background 0.15s, transform 0.1s;
}
.btn:hover { background: var(--primary-hover); text-decoration: none; }
.btn:active { transform: translateY(1px); }
.btn.ghost {
  background: transparent;
  color: var(--text-soft);
  border: 1px solid var(--border);
}
.btn.ghost:hover {
  background: var(--bg-soft);
  color: var(--text);
  text-decoration: none;
}

/* ---------- What ---------- */
.what {
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px 28px;
  margin: 32px 0;
  font-size: 15px;
  color: var(--text-soft);
  line-height: 1.8;
}

/* ---------- Status ---------- */
.status h2 {
  font-size: 20px;
  margin: 0 0 14px;
  color: var(--text);
}
.status ul { display: flex; flex-direction: column; gap: 8px; }
.status li {
  padding: 10px 14px;
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 14px;
  color: var(--text-soft);
}

/* ---------- Links ---------- */
.links { margin-top: 36px; }
.links h2 {
  font-size: 20px;
  margin: 0 0 14px;
}
.links p {
  margin: 0 0 10px;
  font-size: 14px;
  color: var(--text-soft);
  line-height: 1.9;
}
.links a {
  color: var(--primary);
  border-bottom: 1px solid transparent;
  transition: border-color 0.15s;
}
.links a:hover { border-bottom-color: var(--primary); text-decoration: none; }

/* ---------- News ---------- */
.news { margin-top: 36px; }
.news h2 {
  font-size: 20px;
  margin: 0 0 14px;
}
.news-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.news-list li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 12px 14px;
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 14px;
  color: var(--text-soft);
  line-height: 1.6;
}
.news-date {
  flex: 0 0 auto;
  font-family: "SF Mono", "Fira Code", Menlo, Consolas, monospace;
  font-size: 12px;
  color: #8b9099;
  padding-top: 1px;
  min-width: 88px;
}
.news-tag {
  flex: 0 0 auto;
  font-size: 11px;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 4px;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  white-space: nowrap;
  margin-top: 2px;
}
.tag-shipped { background: #e8f5e9; color: #2e7d32; }
.tag-doc     { background: #e3f2fd; color: #1565c0; }
.tag-plan   { background: #fff3e0; color: #e65100; }
.news-text { flex: 1; }

/* ---------- Footer ---------- */
footer {
  border-top: 1px solid var(--border);
  padding: 24px 20px;
  text-align: center;
  font-size: 13px;
  color: #8b9099;
  background: var(--bg-soft);
}
footer p { margin: 4px 0; }

/* ---------- 移动端 ---------- */
@media (max-width: 600px) {
  header {
    padding: 18px 16px 0;
  }
  header .logo { font-size: 16px; }
  header nav { gap: 14px; }
  header nav a { font-size: 13px; }

  main { padding: 24px 16px 40px; }

  .hero { padding: 24px 0 20px; }
  .hero h1 { font-size: 30px; }
  .hero .sub { font-size: 16px; }
  .hero .meta { font-size: 13px; }

  .cta { flex-direction: column; align-items: stretch; }
  .btn { text-align: center; }

  .what { padding: 20px; font-size: 14px; }

  .status li { font-size: 13px; padding: 9px 12px; }

  .news-list li { flex-direction: column; gap: 6px; padding: 10px 12px; }
  .news-date { min-width: 0; font-size: 11px; }
  .news-tag { font-size: 10px; padding: 1px 6px; }

  .links p { font-size: 13px; }
}

/* 暗色模式（系统级自动） */
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1115;
    --bg-soft: #161a22;
    --text: #e6e8ec;
    --text-soft: #a0a6b0;
    --border: #232830;
  }
  .btn.ghost { color: var(--text-soft); }
  .btn.ghost:hover { color: var(--text); }
  footer { background: var(--bg-soft); }

  /* News tags in dark mode */
  .tag-shipped { background: #1b3a1b; color: #81c784; }
  .tag-doc     { background: #1a2a3a; color: #64b5f6; }
  .tag-plan   { background: #3a2a1a; color: #ffb74d; }
}