* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: system-ui, "Noto Sans TC", sans-serif;
  color: #0f172a;
  background: #fff;
}

/* ── 網站 header ── */
.site-header {
  display: flex; align-items: center; gap: 24px;
  padding: 14px 28px; border-bottom: 1px solid #e2e8f0;
  position: sticky; top: 0; background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(8px); z-index: 10;
}
.brand { display: flex; align-items: center; gap: 10px; font-weight: 800; font-size: 18px; }
.brand .logo {
  width: 30px; height: 30px; border-radius: 8px;
  background: linear-gradient(135deg, #5896f5, #2563eb);
  color: #fff; display: flex; align-items: center; justify-content: center; font-weight: 900;
}
.links { display: flex; gap: 20px; }
.links a { color: #475569; text-decoration: none; font-size: 15px; }
.links a:hover { color: #2563eb; }
.login-badge {
  margin-left: auto; font-size: 13px; color: #166534;
  background: #dcfce7; padding: 5px 12px; border-radius: 999px;
}

/* ── hero ── */
.hero { max-width: 780px; margin: 0 auto; padding: 88px 24px 48px; text-align: center; }
.pill { display: inline-block; font-size: 13px; color: #2563eb; background: #eff6ff; border: 1px solid #bfdbfe; padding: 5px 14px; border-radius: 999px; margin-bottom: 18px; }
.hero h1 { font-size: 40px; line-height: 1.2; margin: 0 0 16px; }
.hero p { font-size: 18px; color: #475569; line-height: 1.7; margin: 0 0 22px; }
.hero .hint { font-size: 15px; color: #2563eb; font-weight: 600; }

/* ── 特色 ── */
.features {
  max-width: 980px; margin: 0 auto; padding: 24px 24px 56px;
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px;
}
@media (max-width: 760px) { .features { grid-template-columns: 1fr; } }
.feature { background: #f8fafc; border: 1px solid #e2e8f0; border-radius: 14px; padding: 22px; }
.feature h3 { margin: 0 0 8px; font-size: 17px; }
.feature p { margin: 0; color: #475569; line-height: 1.6; font-size: 14.5px; }
.feature code { background: #0f172a; color: #e2e8f0; padding: 1px 5px; border-radius: 5px; font-size: 12.5px; }

/* ── 使用方式 ── */
.usage { max-width: 760px; margin: 0 auto; padding: 0 24px 96px; }
.usage h2 { font-size: 24px; }
.usage ol { line-height: 2; color: #334155; padding-left: 20px; }
.usage code { background: #0f172a; color: #e2e8f0; padding: 2px 6px; border-radius: 6px; font-size: 13px; }
.usage .note { color: #64748b; font-size: 14px; }