/* ==================== FLOATING PDF BUTTON ==================== */
.fab-pdf {
  position: fixed;
  bottom: 32px;
  right: 32px;
  z-index: 9999;
  width: 56px;
  height: 56px;
  border-radius: 50%;
  border: none;
  cursor: pointer;
  background: linear-gradient(135deg, #0088cc, #005fa3);
  color: #fff;
  box-shadow: 0 4px 20px rgba(0,100,200,0.4), 0 2px 8px rgba(0,0,0,0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.2s, box-shadow 0.2s;
}
.fab-pdf:hover {
  transform: scale(1.1);
  box-shadow: 0 6px 28px rgba(0,100,200,0.55), 0 3px 12px rgba(0,0,0,0.2);
}
.fab-pdf:active {
  transform: scale(0.95);
}
.fab-pdf svg {
  width: 24px;
  height: 24px;
  fill: none;
  stroke: #fff;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.fab-pdf .fab-tooltip {
  position: absolute;
  right: 68px;
  top: 50%;
  transform: translateY(-50%);
  background: rgba(20,30,50,0.9);
  color: #fff;
  font-size: 12px;
  padding: 6px 12px;
  border-radius: 6px;
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s;
}
.fab-pdf:hover .fab-tooltip {
  opacity: 1;
}

/* ==================== PDF TOAST ==================== */
.pdf-toast {
  position: fixed;
  top: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(-80px);
  z-index: 10000;
  background: rgba(20,30,50,0.92);
  color: #fff;
  font-size: 14px;
  padding: 14px 28px;
  border-radius: 10px;
  box-shadow: 0 8px 32px rgba(0,0,0,0.3);
  display: flex;
  align-items: center;
  gap: 12px;
  transition: transform 0.4s cubic-bezier(0.22,1,0.36,1), opacity 0.4s;
  opacity: 0;
  pointer-events: none;
  backdrop-filter: blur(8px);
  border: 1px solid rgba(0,180,255,0.2);
}
.pdf-toast.show {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
}
.pdf-toast .toast-spinner {
  width: 18px; height: 18px;
  border: 2px solid rgba(255,255,255,0.25);
  border-top-color: #00d4ff;
  border-radius: 50%;
  animation: toastSpin 0.8s linear infinite;
  flex-shrink: 0;
}
.pdf-toast .toast-icon {
  font-size: 18px;
  flex-shrink: 0;
}
@keyframes toastSpin {
  to { transform: rotate(360deg); }
}

/* ==================== PRINT ==================== */
@media print {
  .fab-pdf { display: none !important; }
  .pdf-toast { display: none !important; }
  #brochure { zoom: 1 !important; }
}

/* ==================== ACCESSIBILITY ==================== */
/* 键盘聚焦可见：让 Tab 到 FAB / 按钮 / 链接时有清晰焦点环 */
.fab-pdf:focus-visible {
  outline: 3px solid #00d4ff;
  outline-offset: 3px;
}
a:focus-visible,
button:focus-visible {
  outline: 2px solid #00d4ff;
  outline-offset: 2px;
}

/* ==================== SITE NAV (left floating group, no panel) ==================== */
/* 图册整体居中，左右留白即深色 body 背景，菜单直接悬浮其上，无需底色面板。 */
.site-nav {
  position: fixed; left: 56px; top: 50%; transform: translateY(-50%);
  z-index: 9998; width: auto;
  display: flex; flex-direction: column;
}
.site-nav .nav-inner {
  display: flex; flex-direction: column; gap: 14px;
}
.site-nav .nav-brand {
  font-size: 15px; font-weight: 800; color: #e8f3ff; letter-spacing: 1px;
  text-decoration: none; white-space: nowrap;
  padding: 0 0 10px; margin-bottom: 2px;
  border-bottom: 1px solid rgba(0,180,255,0.2);
}
.site-nav .nav-links { display: flex; flex-direction: column; gap: 4px; }
.site-nav .nav-links a {
  position: relative;
  font-size: 13px; color: rgba(200,225,255,0.7); text-decoration: none;
  padding: 5px 0 5px 16px; white-space: nowrap;
  transition: color .15s, transform .15s;
}
/* 悬浮小圆点作菜单指示，默认空心，hover 才亮起——无底色 */
.site-nav .nav-links a::before {
  content: ''; position: absolute; left: 0; top: 50%; transform: translateY(-50%);
  width: 6px; height: 6px; border-radius: 50%;
  border: 1px solid rgba(0,180,255,0.5); background: transparent;
  transition: background .15s, border-color .15s;
}
.site-nav .nav-links a:hover { color: #fff; transform: translateX(3px); }
.site-nav .nav-links a:hover::before { background: #00d4ff; border-color: #00d4ff; }
.site-nav .nav-links a:focus-visible { outline: 2px solid #00d4ff; outline-offset: 3px; border-radius: 3px; }
html { scroll-behavior: smooth; scroll-padding-top: 0; }
.page { scroll-margin-top: 0; }
/* 视口不足以同时放下菜单与居中图册时，隐藏悬浮菜单以免遮挡页面 */
@media (max-width: 1120px) {
  .site-nav { display: none !important; }
}
@media print {
  .site-nav { display: none !important; }
  html { scroll-behavior: auto; }
}