/* ═══════════════════════════════════════
   header.css
═══════════════════════════════════════ */

#header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  padding: 20px 0;
  transition: var(--transition);
}

#header.scrolled {
  background: var(--color-header-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--color-border);
  padding: 14px 0;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
}

/* ── Logo ── */
.logo {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 500;
  letter-spacing: 0.05em;
  color: var(--color-white);
  flex-shrink: 0;
}
.logo span { color: var(--color-accent); }

/* ── Desktop Nav ── */
#main-nav {
  display: flex;
  align-items: center;
  gap: 36px;
}

#main-nav a {
  font-size: 13px;
  font-weight: 400;
  color: var(--color-muted);
  letter-spacing: 0.05em;
  transition: color var(--transition);
  position: relative;
}
#main-nav a::after {
  content: '';
  position: absolute;
  bottom: -3px; left: 0;
  width: 0; height: 1px;
  background: var(--color-accent);
  transition: width var(--transition);
}
#main-nav a:hover             { color: var(--color-text); }
#main-nav a:hover::after       { width: 100%; }

/* ── CTA Button ── */
.header-cta {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: 9px 22px;
  background: transparent;
  border: 1px solid var(--color-accent);
  color: var(--color-accent);
  border-radius: 6px;
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.05em;
  flex-shrink: 0;
  transition: var(--transition);
}
.header-cta:hover {
  background: var(--color-accent);
  color: var(--color-bg);
}

/* ── Hamburger ── */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
  background: none;
  border: none;
}
.hamburger span {
  display: block;
  width: 22px;
  height: 1.5px;
  background: var(--color-text);
  transition: var(--transition);
}

/* ── Mobile Nav ── */
.mobile-nav {
  position: fixed;
  top: 0; right: 0;
  width: 280px;
  height: 100vh;
  background: var(--color-bg2);
  border-left: 1px solid var(--color-border);
  z-index: 2000;
  padding: 80px 32px 40px;
  transform: translateX(100%);
  transition: transform 0.4s var(--ease);
}
.mobile-nav.open {
  transform: translateX(0);
}
.mobile-nav nav {
  display: flex;
  flex-direction: column;
  gap: 0;
}
.mobile-nav a {
  font-size: 18px;
  color: var(--color-muted);
  font-weight: 400;
  padding: 14px 0;
  border-bottom: 1px solid var(--color-border);
  transition: color var(--transition);
}
.mobile-nav a:hover { color: var(--color-accent); }

.mobile-nav-close {
  position: absolute;
  top: 20px; right: 20px;
  width: 36px; height: 36px;
  display: flex; align-items: center; justify-content: center;
  cursor: pointer;
  color: var(--color-muted);
  font-size: 20px;
  background: none;
  border: none;
  transition: color var(--transition);
}
.mobile-nav-close:hover { color: var(--color-white); }

/* ── Header Actions & Theme Toggle ── */
.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.theme-toggle {
  background: transparent;
  border: 1px solid var(--color-border);
  color: var(--color-text);
  width: 40px;
  height: 40px;
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 16px;
  outline: none;
  transition: var(--transition);
}

.theme-toggle:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  background: var(--color-accent-glow);
  transform: translateY(-2px);
}

.theme-toggle i {
  transition: transform 0.5s var(--ease);
}

.theme-toggle:active i {
  transform: rotate(360deg) scale(1.2);
}