/* ============================================
   nav.css — V2 浮動毛玻璃導覽列

   導覽列不再貼齊螢幕邊緣，
   而是浮動在頁面上方，左右留白，
   有圓角和毛玻璃（glassmorphism）效果，
   看起來更精緻高端。
   ============================================ */

.navbar {
  position: fixed;
  top: 16px;
  left: 24px;
  right: 24px;
  z-index: var(--z-sticky);
  padding: 16px 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.5);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--border-glass);
  transition: all var(--duration-normal) var(--ease-out);
}

/* 滾動後：加深背景、縮小 padding */
.navbar.scrolled {
  background: rgba(255, 255, 255, 0.9);
  border-color: var(--border);
  padding: 12px 28px;
  box-shadow: var(--shadow-lg);
}

/* --- Logo --- */
.nav-logo {
  display: flex;
  align-items: center;
  gap: 14px;
  cursor: pointer;
}

.nav-logo-img {
  width: 40px;
  height: 40px;
  transition: transform var(--duration-fast) var(--ease-out);
}

.nav-logo:hover .nav-logo-img {
  transform: rotate(-5deg) scale(1.05);
}

.navbar.scrolled .nav-logo-img {
  width: 36px;
  height: 36px;
}

.nav-brand {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.nav-brand-cn {
  font-family: var(--font-display);
  font-size: 24px;
  font-weight: 700;
  letter-spacing: 3px;
  color: var(--text-primary);
}

.nav-brand-en {
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 2px;
  color: var(--text-muted);
  text-transform: uppercase;
}

/* --- 導覽連結 --- */
.nav-links {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-links a {
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.5px;
  color: var(--text-secondary);
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  position: relative;
  transition: all var(--duration-fast) var(--ease-out);
}

.nav-links a:hover {
  color: var(--text-primary);
  background: rgba(15, 23, 42, 0.08);
}

/* CTA 按鈕 */
.nav-cta-btn {
  background: var(--gold) !important;
  color: #0C0A09 !important;
  font-weight: 600 !important;
  padding: 8px 20px !important;
  border-radius: var(--radius-sm) !important;
}

.nav-cta-btn:hover {
  background: var(--gold-lt) !important;
  box-shadow: var(--shadow-glow-gold) !important;
}

/* --- 漢堡按鈕 --- */
.nav-hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 24px;
  padding: 4px 0;
  z-index: calc(var(--z-modal) + 1);
}

.nav-hamburger span {
  display: block;
  width: 100%;
  height: 1.5px;
  background: var(--text-primary);
  transition: all var(--duration-fast) var(--ease-out);
  border-radius: 1px;
}

.nav-hamburger.active span:nth-child(1) {
  transform: rotate(45deg) translate(4.5px, 4.5px);
}
.nav-hamburger.active span:nth-child(2) { opacity: 0; }
.nav-hamburger.active span:nth-child(3) {
  transform: rotate(-45deg) translate(4.5px, -4.5px);
}

/* --- 手機版全螢幕選單 --- */
.nav-mobile-menu {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100vh;
  height: 100dvh;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(32px);
  -webkit-backdrop-filter: blur(32px);
  z-index: var(--z-modal);
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 40px;
  opacity: 0;
  transition: opacity var(--duration-normal) var(--ease-out);
}

.nav-mobile-menu.active {
  display: flex;
  opacity: 1;
}

.nav-mobile-menu a {
  font-family: var(--font-display);
  font-size: 28px;
  font-weight: 600;
  color: var(--text-secondary);
  letter-spacing: 1px;
  transition: all var(--duration-fast) var(--ease-out);
}

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