/* ========================================
   nav.css - 導航欄公共樣式
   ======================================== */

.site-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.85);
  -webkit-backdrop-filter: blur(20px);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(229, 233, 240, 0.5);
  transition: var(--transition);
}

.site-nav.scrolled {
  background: rgba(255, 255, 255, 0.95);
  box-shadow: 0 2px 20px rgba(15, 89, 160, 0.08);
}

.nav-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  flex-shrink: 0;
}

.nav-logo {
  width: 36px;
  height: 36px;
  object-fit: contain;
}

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

.nav-brand-name {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-dark);
  letter-spacing: -0.02em;
}

.nav-brand-sub {
  font-size: 0.6875rem;
  color: var(--text-muted);
  letter-spacing: 0.02em;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-right: 16px;
}

.nav-link {
  padding: 8px 16px;
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--text-body);
  border-radius: var(--radius-sm);
  transition: var(--transition);
  position: relative;
}

.nav-link:hover {
  color: var(--primary);
  background: var(--primary-ultra-light);
}

.nav-link.active {
  color: var(--primary);
  font-weight: 600;
}

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: 2px;
  left: 50%;
  transform: translateX(-50%);
  width: 20px;
  height: 3px;
  background: var(--primary);
  border-radius: 2px;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.nav-btn-trial {
  font-size: 0.875rem !important;
  padding: 8px 18px !important;
}

.nav-btn-buy {
  font-size: 0.875rem !important;
  padding: 8px 20px !important;
}

.nav-hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 40px;
  height: 40px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  gap: 5px;
  border-radius: var(--radius-sm);
  transition: var(--transition);
}

.nav-hamburger:hover {
  background: var(--primary-ultra-light);
}

.nav-hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text-dark);
  border-radius: 2px;
  transition: var(--transition);
}

.nav-hamburger.open span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-hamburger.open span:nth-child(2) {
  opacity: 0;
}

.nav-hamburger.open span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.nav-spacer {
  height: 68px;
}

/* ========== 產品下拉選單 ========== */
.nav-dropdown {
  position: relative;
}

.nav-dropdown-toggle {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  border: none;
  background: none;
  font-family: inherit;
  cursor: pointer;
}

.nav-dropdown-caret {
  transition: transform 0.2s ease;
}

.nav-dropdown.open .nav-dropdown-caret {
  transform: rotate(180deg);
}

.nav-dropdown.open .nav-dropdown-toggle {
  color: var(--primary);
  background: var(--primary-ultra-light);
}

.nav-dropdown-panel {
  position: absolute;
  top: calc(100% + 12px);
  left: 0;
  min-width: 560px;
  background: rgba(255, 255, 255, 0.98);
  -webkit-backdrop-filter: blur(20px);
  backdrop-filter: blur(20px);
  border: 1px solid var(--border);
  border-radius: 14px;
  box-shadow: 0 16px 48px rgba(15, 23, 42, 0.14);
  padding: 16px;
  opacity: 0;
  transform: translateY(-8px);
  pointer-events: none;
  transition: opacity 0.2s ease, transform 0.2s ease;
  z-index: 1001;
}

.nav-dropdown.open .nav-dropdown-panel {
  opacity: 1;
  transform: translateY(0);
  pointer-events: all;
}

.nav-dropdown-heading {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-muted);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 6px 8px 10px;
}

.nav-product-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 4px;
}

.nav-product-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 12px;
  border-radius: 10px;
  text-decoration: none;
  color: inherit;
  transition: background-color 0.15s ease, transform 0.15s ease;
}

.nav-product-item:hover {
  background: var(--primary-ultra-light);
}

.nav-product-item-current {
  background: var(--primary-ultra-light);
}

.nav-product-logo {
  width: 36px;
  height: 36px;
  object-fit: contain;
  flex-shrink: 0;
}

.nav-product-text {
  display: flex;
  flex-direction: column;
  line-height: 1.25;
  min-width: 0;
}

.nav-product-name {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--text-dark);
  display: flex;
  align-items: center;
  gap: 6px;
}

.nav-product-badge {
  font-size: 0.6875rem;
  font-weight: 600;
  color: var(--primary);
  background: #fff;
  border: 1px solid var(--primary);
  padding: 1px 6px;
  border-radius: 4px;
  line-height: 1.2;
}

.nav-product-desc {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 2px;
}

@media (max-width: 768px) {
  .nav-hamburger {
    display: flex;
  }

  .nav-menu {
    position: fixed;
    top: 68px;
    left: 0;
    right: 0;
    max-height: calc(100vh - 68px);
    overflow-y: auto;
    overscroll-behavior: contain;
    background: rgba(255, 255, 255, 0.98);
    -webkit-backdrop-filter: blur(20px);
    backdrop-filter: blur(20px);
    flex-direction: column;
    padding: 16px 24px 24px;
    gap: 16px;
    border-bottom: 1px solid var(--border-light);
    box-shadow: var(--shadow-lg);
    transform: translateY(-120%);
    opacity: 0;
    transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1), opacity 0.35s ease;
    pointer-events: none;
  }

  .nav-menu.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: all;
  }

  .nav-links {
    flex-direction: column;
    width: 100%;
    margin-right: 0;
    gap: 4px;
  }

  .nav-link {
    width: 100%;
    text-align: center;
    padding: 12px 16px;
  }

  .nav-actions {
    width: 100%;
    flex-direction: column;
    gap: 10px;
  }

  .nav-actions .btn {
    width: 100%;
    justify-content: center;
  }

  /* 移動端：產品下拉改為內聯展開 */
  .nav-dropdown {
    width: 100%;
  }

  .nav-dropdown-toggle {
    width: 100%;
    justify-content: center;
    padding: 12px 16px;
  }

  .nav-dropdown-panel {
    position: static;
    min-width: 0;
    width: 100%;
    opacity: 1;
    transform: none;
    pointer-events: all;
    box-shadow: none;
    margin-top: 8px;
    max-height: 0;
    overflow: hidden;
    padding-top: 0;
    padding-bottom: 0;
    border-width: 0;
    transition: max-height 0.3s ease, padding 0.3s ease, border-width 0.2s ease;
  }

  .nav-dropdown.open .nav-dropdown-panel {
    max-height: 1000px;
    padding-top: 12px;
    padding-bottom: 12px;
    border-width: 1px;
  }

  .nav-product-grid {
    grid-template-columns: 1fr;
  }
}