:root {
  --cfd-font: system-ui, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --cfd-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --cfd-bg-1: #fff;
  --cfd-bg-2: #f6f6f6;
  --cfd-bg-3: #e7e7e7;
  --cfd-text-1: #1b1b1b;
  --cfd-text-2: #757575;
  --cfd-border: #dfdfdf;
  --cfd-accent: #003FFF;
}

body.dark-mode {
  --cfd-bg-1: #0f0f0f;
  --cfd-bg-2: #1a1a1a;
  --cfd-bg-3: #272727;
  --cfd-text-1: #e7e7e7;
  --cfd-text-2: #a4a4a4;
  --cfd-border: #2d2d2d;
  --cfd-accent: #5c7cfa;
}

body {
  margin: 0;
  background: var(--cfd-bg-1);
  color: var(--cfd-text-1);
  font-family: var(--cfd-font);
}

.cfd-header {
  display: flex;
  align-items: center;
  gap: 25px;
  padding: 14px 24px;
  border-bottom: 1px solid var(--cfd-border);
  background: var(--cfd-bg-1);
}

.cfd-header > a { display: flex; align-items: center; }
.cfd-header img { height: 26px; display: block; }
.cfd-header img.cfd-logo-dark,
.cfd-site-footer img.cfd-logo-dark { display: none; }
body.dark-mode .cfd-header img.cfd-logo-light,
body.dark-mode .cfd-site-footer img.cfd-logo-light { display: none; }
body.dark-mode .cfd-header img.cfd-logo-dark,
body.dark-mode .cfd-site-footer img.cfd-logo-dark { display: block; }

.cfd-nav {
  display: flex;
  align-items: center;
  gap: 4px;
}

.cfd-nav a {
  color: var(--cfd-text-2);
  font-size: 14px;
  text-decoration: none;
  padding: 6px 10px;
  border-radius: 6px;
}

.cfd-nav a:hover { color: var(--cfd-text-1); background: var(--cfd-bg-2); }
.cfd-nav a.cfd-nav-active { color: var(--cfd-accent); font-weight: 500; }

.cfd-header-right {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 14px;
}

.cfd-app-link { color: var(--cfd-accent); font-size: 14px; font-weight: 500; text-decoration: none; }
.cfd-app-link:hover { text-decoration: underline; }

.cfd-theme-toggle {
  position: relative;
  width: 46px;
  height: 24px;
  border-radius: 12px;
  border: 1px solid var(--cfd-border);
  background: var(--cfd-bg-2);
  cursor: pointer;
  padding: 0;
}

.cfd-theme-toggle .cfd-toggle-knob {
  position: absolute;
  top: 2px;
  left: 2px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--cfd-bg-1);
  border: 1px solid var(--cfd-border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  line-height: 1;
  color: var(--cfd-text-2);
  transition: left 0.15s ease;
}

body.dark-mode .cfd-theme-toggle .cfd-toggle-knob { left: 24px; }
.cfd-theme-toggle .cfd-icon-moon { display: none; }
body.dark-mode .cfd-theme-toggle .cfd-icon-moon { display: block; }
body.dark-mode .cfd-theme-toggle .cfd-icon-sun { display: none; }

.cfd-container {
  max-width: 1000px;
  margin: 0 auto;
  padding: 40px 24px 80px;
}

.cfd-container h1 { font-size: 32px; margin: 0 0 8px; }
.cfd-container h2 { font-size: 22px; margin: 48px 0 12px; }
.cfd-container h3 { font-size: 17px; margin: 28px 0 8px; }
.cfd-container p, .cfd-container li { font-size: 15px; line-height: 1.6; color: var(--cfd-text-1); }
.cfd-lead { color: var(--cfd-text-2); font-size: 17px; margin-bottom: 32px; }
.cfd-container a { color: var(--cfd-accent); }

.cfd-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 16px;
  margin: 24px 0;
}

.cfd-card {
  border: 1px solid var(--cfd-border);
  border-radius: 8px;
  padding: 20px;
  background: var(--cfd-bg-1);
  text-decoration: none;
  display: block;
}

.cfd-card:hover { border-color: var(--cfd-accent); }
.cfd-card h3 { margin: 0 0 8px; color: var(--cfd-text-1); font-size: 17px; }
.cfd-card p { margin: 0 0 10px; color: var(--cfd-text-2); font-size: 14px; }
.cfd-card .cfd-card-cta { color: var(--cfd-accent); font-size: 14px; font-weight: 500; }
.cfd-card .cfd-card-best { font-size: 13px; color: var(--cfd-text-2); font-style: italic; }

.cfd-card-simple {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 14px;
  padding: 36px 20px;
  text-align: center;
}

.cfd-card-simple i { font-size: 30px; color: var(--cfd-accent); }
.cfd-card-simple h3 { margin: 0; }

pre.cfd-code {
  background: var(--cfd-bg-2);
  border: 1px solid var(--cfd-border);
  border-radius: 8px;
  padding: 14px 16px;
  overflow-x: auto;
  font-family: var(--cfd-mono);
  font-size: 13px;
  line-height: 1.5;
  color: var(--cfd-text-1);
}

code.cfd-inline {
  background: var(--cfd-bg-2);
  border: 1px solid var(--cfd-border);
  border-radius: 4px;
  padding: 1px 5px;
  font-family: var(--cfd-mono);
  font-size: 13px;
}

.cfd-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
  margin: 12px 0 24px;
}

.cfd-table th, .cfd-table td {
  text-align: left;
  padding: 8px 12px;
  border-bottom: 1px solid var(--cfd-border);
  vertical-align: top;
}

.cfd-table th { color: var(--cfd-text-2); font-weight: 500; font-size: 13px; }
.cfd-table td code { font-family: var(--cfd-mono); font-size: 13px; }
.cfd-table .cfd-type { color: var(--cfd-text-2); font-family: var(--cfd-mono); font-size: 13px; white-space: nowrap; }

.cfd-badge {
  display: inline-block;
  border: 1px solid var(--cfd-border);
  border-radius: 10px;
  padding: 1px 8px;
  font-size: 12px;
  color: var(--cfd-text-2);
  vertical-align: middle;
}

.cfd-tool {
  border: 1px solid var(--cfd-border);
  border-radius: 8px;
  padding: 18px 20px;
  margin: 14px 0;
}

.cfd-tool h3 { margin: 0 0 6px; font-family: var(--cfd-mono); font-size: 15px; }
.cfd-tool > p { margin: 0 0 6px; color: var(--cfd-text-2); font-size: 14px; }
.cfd-tool .cfd-table { margin-bottom: 4px; }

.cfd-footer {
  margin-top: 56px;
  padding-top: 16px;
  border-top: 1px solid var(--cfd-border);
  font-size: 13px;
  color: var(--cfd-text-2);
}

.cfd-site-footer {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 18px;
  margin-top: 72px;
  padding: 48px 24px;
  border-top: 1px solid var(--cfd-border);
  background: var(--cfd-bg-2);
}

.cfd-site-footer img { height: 24px; display: block; }
.cfd-site-footer-links a {
  color: var(--cfd-text-2);
  font-size: 14px;
  text-decoration: none;
}
.cfd-site-footer-links a:hover { color: var(--cfd-text-1); }

.cfd-site-footer-social {
  display: flex;
  gap: 16px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.cfd-site-footer-social a { color: var(--cfd-text-2); display: block; }
.cfd-site-footer-social a:hover { color: var(--cfd-accent); }
.cfd-site-footer-social svg { display: block; }

.cfd-back-to-top {
  position: fixed;
  bottom: 100px;
  right: 24px;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 1px solid var(--cfd-border);
  background: var(--cfd-bg-1);
  color: var(--cfd-text-2);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.12);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.15s ease;
  z-index: 100;
}

.cfd-back-to-top.cfd-back-to-top-visible { opacity: 1; pointer-events: auto; }
.cfd-back-to-top:hover { color: var(--cfd-accent); border-color: var(--cfd-accent); }