/* ============================================================
   02-nav.css — top navigation bar
   Module: <header id="header">
   Sticky, white bar with logo + nav links + CTA button.
   Mobile: hamburger menu slides down from header.
   ============================================================ */

#header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--c-white);
  border-bottom: 1px solid var(--c-line);
  box-shadow: 0 1px 4px rgba(15, 59, 95, 0.06);
}
#header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--s-4);
  height: 72px;
}

/* ---- Logo: bear badge mark + stacked text wordmark + tagline ---- */
.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
  text-decoration: none;
}
.logo-mark {
  width: 52px;
  height: 52px;
  display: block;
  flex-shrink: 0;
  filter: drop-shadow(0 2px 4px rgba(0,0,0,0.15));
}
.logo-text {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 3px;
  line-height: 1;
}
.logo-name {
  font-family: var(--f-display);
  font-size: 1.05rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  color: var(--c-navy);
  line-height: 1;
  white-space: nowrap;
}
.logo-tagline {
  font-size: 0.66rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--c-muted);
  text-transform: uppercase;
  white-space: nowrap;
  line-height: 1;
}
#header .container { height: 80px; }
@media (max-width: 960px) {
  .logo-tagline { display: none; }
  .logo-mark { width: 44px; height: 44px; }
  .logo-name { font-size: 0.95rem; }
  #header .container { height: 70px; }
}
@media (max-width: 480px) {
  .logo-mark { width: 40px; height: 40px; }
  .logo-name { font-size: 0.85rem; }
}

/* ---- Desktop nav links ---- */
.nav {
  display: flex;
  gap: var(--s-5);
  align-items: center;
}
.nav a {
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--c-black-soft);
  white-space: nowrap;
  transition: color 0.15s ease;
  position: relative;
}
.nav a::after {
  content: "";
  position: absolute;
  bottom: -3px;
  left: 0; right: 100%;
  height: 2px;
  background: var(--c-yellow);
  transition: right 0.2s ease;
}
.nav a:hover { color: var(--c-navy); }
.nav a:hover::after { right: 0; }
.nav a.is-active { color: var(--c-navy); }
.nav a.is-active::after { right: 0; }

/* ---- Header CTA ---- */
.header-cta {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}
@media (max-width: 768px) {
  .header-cta .btn { display: none; }
}

/* ---- Mobile hamburger ---- */
.nav-toggle {
  display: none;
  background: transparent;
  border: 0;
  width: 42px; height: 42px;
  flex-shrink: 0;
  position: relative;
  padding: 0;
}
.nav-toggle span {
  display: block;
  width: 22px; height: 2px;
  background: var(--c-black);
  margin: 5px auto;
  transition: transform 0.22s ease, opacity 0.22s ease;
}
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---- Responsive: mobile nav ---- */
@media (max-width: 960px) {
  .nav {
    position: fixed;
    inset: 70px 0 auto 0;
    background: var(--c-white);
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    padding: var(--s-2) 0;
    border-bottom: 1px solid var(--c-line);
    box-shadow: var(--shadow-md);
    transform: translateY(-110%);
    transition: transform 0.25s ease;
  }
  .nav.is-open { transform: translateY(0); }
  .nav a {
    width: 100%;
    padding: 14px var(--s-4);
    border-bottom: 1px solid var(--c-line);
    font-size: 1rem;
  }
  .nav a::after { display: none; }
  .nav-toggle { display: block; }
}