:root {
  --bg: #0f1419;
  --surface: #1a2332;
  --text: #e8edf4;
  --muted: #8b9cb3;
  --accent: #3d9cf0;
  --accent-dim: #2563a8;
  --border: #2a3544;
  --nav-h: 56px;
  font-family: "DM Sans", system-ui, sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  padding-top: var(--nav-h);
}

.clf-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(15, 20, 25, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
  height: var(--nav-h);
}

.clf-nav-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 1.25rem;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.clf-logo {
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--text);
  text-decoration: none;
  letter-spacing: -0.02em;
}

.clf-nav nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 1rem;
}

.clf-nav nav a {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.9rem;
  padding: 0.35rem 0;
}

.clf-nav nav a:hover,
.clf-nav nav a.active {
  color: var(--accent);
}

/* ─── hamburger toggle ────────────────────────────────────────────────── */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.4rem;
  margin-left: auto;
  flex-shrink: 0;
}
.nav-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--muted);
  border-radius: 2px;
  transition: transform 0.2s, opacity 0.2s, width 0.2s;
  transform-origin: center;
}
.nav-toggle.is-open span:nth-child(1) { transform: translateY(7px) rotate(45deg); background: var(--text); }
.nav-toggle.is-open span:nth-child(2) { opacity: 0; width: 0; }
.nav-toggle.is-open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); background: var(--text); }

/* ─── mobile ──────────────────────────────────────────────────────────── */
@media (max-width: 640px) {
  .nav-toggle { display: flex; }

  .clf-nav-inner { height: var(--nav-h); flex-wrap: nowrap; }

  .clf-nav nav {
    display: none;
    position: fixed;
    top: var(--nav-h);
    left: 0;
    right: 0;
    background: rgba(15, 20, 25, 0.97);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    padding: 0.5rem 0;
    gap: 0;
    z-index: 999;
  }

  .clf-nav nav.nav-open { display: flex; }

  .clf-nav nav a {
    font-size: 1rem;
    padding: 0.75rem 1.5rem;
    border-bottom: 1px solid var(--border);
  }
  .clf-nav nav a:last-child { border-bottom: none; }
}