/* ============================================================
   NAV — fixed top bar, theme toggle, hamburger, mobile menu
   ============================================================ */


/* ── Desktop nav bar ──────────────────────────────────────── */

nav {
  position:   fixed;
  top: 0; left: 0; right: 0;
  z-index:    100;
  display:    flex;
  align-items:     center;
  justify-content: space-between;
  padding:    1.2rem 4rem;
  background: var(--white);
  border-bottom: 1px solid var(--border);
}

.nav-logo {
  font-family:     'Playfair Display', serif;
  font-size:       1.1rem;
  font-weight:     700;
  letter-spacing:  -0.02em;
  text-decoration: none;
  color:           var(--black);
}

.nav-links {
  display:    flex;
  gap:        2.5rem;
  list-style: none;
}

.nav-links a {
  text-decoration: none;
  color:           var(--gray);
  font-size:       12px;
  letter-spacing:  0.08em;
  text-transform:  uppercase;
  transition:      color 0.2s;
}

.nav-links a:hover {
  color: var(--black);
}

/* The "AMA" pill button inside the nav */
.nav-ama {
  background: var(--black) !important;
  color:      var(--white) !important;
  padding:    0.4rem 1rem;
  border-radius: 2px;
  transition: background 0.4s ease, color 0.4s ease !important;
}


/* ── Theme toggle (sun/moon pill) ─────────────────────────── */

.theme-toggle {
  background:    none;
  border:        1px solid var(--border);
  cursor:        pointer;
  width:         52px;
  height:        28px;
  border-radius: 14px;
  position:      relative;
  padding:       0;
  transition:    border-color 0.3s ease;
  flex-shrink:   0;
}

.theme-toggle:hover {
  border-color: var(--black);
}

/* The sliding circle inside the toggle */
.toggle-thumb {
  position:      absolute;
  top:  3px;
  left: 3px;
  width:         20px;
  height:        20px;
  border-radius: 50%;
  background:    var(--black);
  display:       flex;
  align-items:   center;
  justify-content: center;
  /* Bouncy slide animation */
  transition: transform 0.35s cubic-bezier(0.34, 1.56, 0.64, 1), background 0.4s ease;
  font-size:   12px;
  line-height: 1;
}

/* Slide thumb to the right in dark mode */
[data-theme="dark"] .toggle-thumb {
  transform: translateX(24px);
}

.icon-sun,
.icon-moon {
  position:   absolute;
  font-size:  12px;
  color:      var(--white);
  transition: opacity 0.25s ease;
}

/* Light mode: show sun, hide moon */
.icon-sun  { opacity: 1; }
.icon-moon { opacity: 0; }

/* Dark mode: hide sun, show moon */
[data-theme="dark"] .icon-sun  { opacity: 0; }
[data-theme="dark"] .icon-moon { opacity: 1; }


/* ── Hamburger button (hidden on desktop) ─────────────────── */

.hamburger {
  display:         none; /* shown via media query in responsive.css */
  flex-direction:  column;
  justify-content: center;
  gap:             5px;
  background:      none;
  border:          none;
  cursor:          pointer;
  padding:         4px;
  width:           32px;
  height:          32px;
}

.hamburger span {
  display:       block;
  height:        2px;
  background:    var(--black);
  border-radius: 2px;
  transition:    transform 0.3s ease, opacity 0.3s ease;
}

/* Animate the three bars into an × when menu is open */
.hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }


/* ── Mobile slide-down menu ───────────────────────────────── */

.mobile-menu {
  display:        none; /* toggled to flex by JS adding .open */
  position:       fixed;
  top: 57px; left: 0; right: 0;
  background:     var(--white);
  border-bottom:  1px solid var(--border);
  z-index:        99;
  padding:        1.5rem 1.5rem 2rem;
  flex-direction: column;
  gap:            1.2rem;
  transition:     background 0.4s ease;
}

.mobile-menu.open {
  display: flex;
}

.mobile-menu a {
  text-decoration: none;
  color:           var(--gray);
  font-size:       13px;
  letter-spacing:  0.08em;
  text-transform:  uppercase;
  padding:         0.5rem 0;
  border-bottom:   1px solid var(--border);
  transition:      color 0.2s;
}

.mobile-menu a:hover {
  color: var(--black);
}

/* AMA button inside mobile menu — matches .nav-ama style */
.mobile-menu .nav-ama {
  background:    var(--black) !important;
  color:         var(--white) !important;
  padding:       0.7rem 1rem;
  border-radius: 2px;
  border:        none;
  text-align:    center;
  margin-top:    0.3rem;
}