/* ==========================================================================
   響應式 + 手機選單
   ========================================================================== */

.hamburger {
  display: none;
  position: relative;
  width: 44px;
  height: 44px;
  z-index: 1100;
  border-radius: 50%;
  background: rgba(201,169,97,0.08);
  border: 1px solid var(--color-border);
}
.hamburger-box {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 22px;
  height: 16px;
  transform: translate(-50%, -50%);
}
.hamburger-line {
  position: absolute;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--color-gold);
  border-radius: 2px;
  transition: all 0.4s cubic-bezier(0.68, -0.55, 0.27, 1.55);
}
.hamburger-line:nth-child(1) { top: 0; }
.hamburger-line:nth-child(2) { top: 50%; transform: translateY(-50%); width: 70%; }
.hamburger-line:nth-child(3) { bottom: 0; }
.hamburger.active .hamburger-line:nth-child(1) { top: 50%; transform: translateY(-50%) rotate(45deg); }
.hamburger.active .hamburger-line:nth-child(2) { opacity: 0; transform: translateX(20px); }
.hamburger.active .hamburger-line:nth-child(3) { bottom: 50%; transform: translateY(50%) rotate(-45deg); }

.mobile-nav {
  position: fixed;
  top: 0;
  right: 0;
  width: 100%;
  max-width: 420px;
  height: 100vh;
  background: rgba(10,10,10,0.98);
  backdrop-filter: blur(30px);
  border-left: 1px solid var(--color-border);
  z-index: 1050;
  padding: calc(var(--header-height) + 2rem) var(--space-md) var(--space-md);
  transform: translateX(100%);
  transition: transform 0.6s cubic-bezier(0.77, 0, 0.18, 1);
  overflow-y: auto;
}
.mobile-nav.open { transform: translateX(0); }
.mobile-nav-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.6);
  backdrop-filter: blur(4px);
  z-index: 1040;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.4s, visibility 0.4s;
}
.mobile-nav-backdrop.open {
  opacity: 1;
  visibility: visible;
}
.mobile-nav-list { display: flex; flex-direction: column; }
.mobile-nav-item {
  opacity: 0;
  transform: translateX(40px);
  transition: opacity .5s, transform .5s;
  border-bottom: 1px solid var(--color-border);
}
.mobile-nav.open .mobile-nav-item { opacity: 1; transform: translateX(0); }
.mobile-nav.open .mobile-nav-item:nth-child(1) { transition-delay: .20s; }
.mobile-nav.open .mobile-nav-item:nth-child(2) { transition-delay: .28s; }
.mobile-nav.open .mobile-nav-item:nth-child(3) { transition-delay: .36s; }
.mobile-nav.open .mobile-nav-item:nth-child(4) { transition-delay: .44s; }
.mobile-nav.open .mobile-nav-item:nth-child(5) { transition-delay: .52s; }
.mobile-nav.open .mobile-nav-item:nth-child(6) { transition-delay: .60s; }
.mobile-nav.open .mobile-nav-item:nth-child(7) { transition-delay: .68s; }
.mobile-nav-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.15rem 0;
  font-family: var(--font-serif);
  font-size: 1.45rem;
  font-weight: 600;
}
.mobile-nav-link.active { color: var(--color-gold); }
.mobile-nav-cta { margin-top: 2rem; }
.mobile-nav-social {
  display: flex;
  gap: .75rem;
  margin-top: 1.5rem;
}
.mobile-nav-social a {
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  border: 1px solid var(--color-border);
  border-radius: 50%;
  color: var(--color-gold);
}
.menu-open { overflow: hidden; }

@media (max-width: 1024px) {
  .hamburger { display: block; }
}
@media (max-width: 480px) {
  .mobile-nav { max-width: none; }
  .mobile-nav-link { font-size: 1.25rem; }
}