/* =============================================
   Global Navigation — shared-nav.css
   所有選擇器加 .gn- 前綴，避免與各頁面 CSS 衝突
   ============================================= */

/* ---------- Top Bar ---------- */
#gn-root * { box-sizing: border-box; }

.gn-topbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 48px;
  z-index: 1100;
  background: #1e2532;
  display: flex;
  align-items: center;
  padding: 0 16px;
  gap: 0;
  box-shadow: 0 2px 8px rgba(0,0,0,0.25);
}

.gn-logo {
  color: #fff;
  text-decoration: none;
  font-weight: 700;
  font-size: 15px;
  letter-spacing: 0.3px;
  white-space: nowrap;
  margin-right: 20px;
  flex-shrink: 0;
}
.gn-logo:hover { color: #e0e6ff; }

.gn-systems {
  display: flex;
  align-items: center;
  gap: 2px;
  flex: 1;
}

.gn-reset-btn {
  flex-shrink: 0;
  background: rgba(255,255,255,0.08);
  color: rgba(255,255,255,0.7);
  border: 1px solid rgba(255,255,255,0.18);
  border-radius: 6px;
  padding: 4px 12px;
  font-size: 12px;
  cursor: pointer;
  white-space: nowrap;
  transition: background 0.15s, color 0.15s;
}
.gn-reset-btn:hover {
  background: rgba(255,80,80,0.25);
  color: #fff;
  border-color: rgba(255,80,80,0.5);
}

.gn-system-tab {
  color: rgba(255,255,255,0.65);
  text-decoration: none;
  padding: 6px 16px;
  border-radius: 6px;
  font-size: 15px;
  font-weight: 500;
  white-space: nowrap;
  transition: background 0.15s, color 0.15s;
  line-height: 1;
}
.gn-system-tab:hover {
  color: #fff;
  background: rgba(255,255,255,0.1);
}
.gn-system-tab.gn-active {
  color: #fff;
  background: rgba(255,255,255,0.15);
  position: relative;
}
.gn-system-tab.gn-active::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 50%;
  transform: translateX(-50%);
  width: 60%;
  height: 2px;
  background: #6c8bff;
  border-radius: 2px;
}

.gn-hamburger {
  display: none;
  background: none;
  border: none;
  color: #fff;
  font-size: 22px;
  cursor: pointer;
  padding: 4px 8px;
  border-radius: 6px;
  line-height: 1;
  flex-shrink: 0;
}
.gn-hamburger:hover { background: rgba(255,255,255,0.1); }

/* ---------- Sidebar (桌面，僅內部後台) ---------- */
.gn-sidebar {
  position: fixed;
  top: 48px;
  left: 0;
  bottom: 0;
  width: 200px;
  z-index: 1050;
  background: #f5f6fa;
  border-right: 1px solid #dde1ec;
  overflow-y: auto;
  padding: 12px 0 24px;
  scrollbar-width: thin;
  scrollbar-color: #c8cdd8 transparent;
}
.gn-sidebar::-webkit-scrollbar { width: 4px; }
.gn-sidebar::-webkit-scrollbar-thumb { background: #c8cdd8; border-radius: 4px; }

.gn-sidebar-section {
  padding: 6px 12px 4px;
  font-size: 12px;
  font-weight: 700;
  color: #9ba3b8;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  margin-top: 4px;
}

.gn-nav-item {
  display: block;
  padding: 10px 20px;
  color: #4a5270;
  text-decoration: none;
  font-size: 15px;
  transition: background 0.12s, color 0.12s, border-color 0.12s;
  border-left: 3px solid transparent;
  line-height: 1.3;
}
.gn-nav-item:hover {
  background: #e8ebf7;
  color: #1e2532;
}
.gn-nav-item.gn-active {
  background: #e4e9ff;
  color: #2a4de0;
  border-left-color: #4a6cf7;
  font-weight: 600;
}

/* ---------- Sidebar Group (可展開群組) ---------- */
.gn-nav-group-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 10px 20px;
  border: none;
  background: none;
  text-align: left;
  font-size: 15px;
  font-weight: 600;
  color: #4a5270;
  cursor: pointer;
  font-family: inherit;
  border-left: 3px solid transparent;
  transition: background 0.12s, color 0.12s;
}
.gn-nav-group-header:hover { background: #e8ebf7; color: #1e2532; }
.gn-nav-group-header.gn-open { color: #2a4de0; }
.gn-nav-arrow { font-size: 10px; transition: transform 0.2s; flex-shrink: 0; }
.gn-nav-group-header.gn-open .gn-nav-arrow { transform: rotate(90deg); }
.gn-nav-group-items { overflow: hidden; max-height: 0; transition: max-height 0.25s ease; }
.gn-nav-group-items.gn-open { max-height: 300px; }
.gn-nav-child-item {
  display: block;
  padding: 8px 20px 8px 32px;
  color: #4a5270;
  text-decoration: none;
  font-size: 14px;
  border-left: 3px solid transparent;
  transition: background 0.12s, color 0.12s;
}
.gn-nav-child-item:hover { background: #e8ebf7; color: #1e2532; }
.gn-nav-child-item.gn-active {
  background: #e4e9ff;
  color: #2a4de0;
  border-left-color: #4a6cf7;
  font-weight: 600;
}

/* ---------- Mobile Drawer ---------- */
.gn-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.45);
  z-index: 1099;
  cursor: pointer;
}
.gn-overlay.gn-open { display: block; }

.gn-drawer {
  display: none;
  position: fixed;
  top: 48px;
  left: 0;
  bottom: 0;
  width: 240px;
  z-index: 1100;
  background: #fff;
  border-right: 1px solid #dde1ec;
  overflow-y: auto;
  padding: 0 0 24px;
  transform: translateX(-100%);
  transition: transform 0.25s ease;
  box-shadow: 4px 0 16px rgba(0,0,0,0.12);
}
.gn-drawer.gn-open {
  transform: translateX(0);
}

.gn-drawer-systems {
  display: flex;
  flex-direction: column;
  gap: 0;
  border-bottom: 1px solid #eee;
  padding: 8px 0;
}
.gn-drawer-sys-tab {
  display: block;
  padding: 11px 20px;
  color: #4a5270;
  text-decoration: none;
  font-size: 15px;
  font-weight: 600;
  transition: background 0.12s;
}
.gn-drawer-sys-tab:hover { background: #f0f2ff; color: #2a4de0; }
.gn-drawer-sys-tab.gn-active {
  color: #2a4de0;
  background: #eef1ff;
}

.gn-drawer-pages {
  padding: 8px 0;
}
.gn-drawer-page-label {
  padding: 8px 20px 4px;
  font-size: 12px;
  font-weight: 700;
  color: #9ba3b8;
  text-transform: uppercase;
  letter-spacing: 0.8px;
}
.gn-drawer-nav-item {
  display: block;
  padding: 10px 20px;
  color: #4a5270;
  text-decoration: none;
  font-size: 15px;
  transition: background 0.12s;
  border-left: 3px solid transparent;
}
.gn-drawer-nav-item:hover { background: #f0f2ff; color: #1e2532; }
.gn-drawer-nav-item.gn-active {
  background: #e4e9ff;
  color: #2a4de0;
  border-left-color: #4a6cf7;
  font-weight: 600;
}

/* ---------- Drawer Group ---------- */
.gn-drawer-group-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 10px 20px;
  border: none;
  background: none;
  text-align: left;
  font-size: 15px;
  font-weight: 600;
  color: #4a5270;
  cursor: pointer;
  font-family: inherit;
  border-left: 3px solid transparent;
  transition: background 0.12s, color 0.12s;
}
.gn-drawer-group-header:hover { background: #f0f2ff; color: #1e2532; }
.gn-drawer-group-header.gn-open { color: #2a4de0; }
.gn-drawer-group-items { overflow: hidden; max-height: 0; transition: max-height 0.25s ease; }
.gn-drawer-group-items.gn-open { max-height: 300px; }
.gn-drawer-child-item {
  display: block;
  padding: 8px 20px 8px 32px;
  color: #4a5270;
  text-decoration: none;
  font-size: 14px;
  border-left: 3px solid transparent;
  transition: background 0.12s;
}
.gn-drawer-child-item:hover { background: #f0f2ff; color: #1e2532; }
.gn-drawer-child-item.gn-active {
  background: #e4e9ff;
  color: #2a4de0;
  border-left-color: #4a6cf7;
  font-weight: 600;
}

/* ---------- RWD ---------- */
@media (max-width: 768px) {
  .gn-hamburger { display: flex; align-items: center; margin-right: 8px; }
  .gn-systems { display: none; }
  .gn-sidebar { display: none; }
  .gn-drawer { display: block; }
}