/* ── Site Header ── */
.site-header{
  position:sticky;top:0;z-index:1100;
  height:60px;
  background:var(--bg);
  border-bottom:1px solid var(--line);
}
.topbar-shell{
  display:flex;align-items:center;gap:8px;
  height:100%;
  width:var(--shell);
  margin-inline:auto;
  padding-inline:var(--gutter);
}

/* Brand */
.brand-link{display:flex;align-items:center;gap:10px;color:var(--text);flex-shrink:0}
.brand-mark{width:32px;height:32px;border-radius:8px;object-fit:contain}
.brand-copy strong{display:block;font-size:.95rem;font-weight:600;line-height:1.2}
.brand-copy small{display:block;font-size:.75rem;color:var(--text-soft)}

/* Main nav */
.main-nav{display:flex;align-items:center;gap:2px;margin-left:32px}
.main-nav a{
  padding:8px 14px;border-radius:var(--radius-md);
  color:var(--text-soft);font-size:.9rem;font-weight:500;
  white-space:nowrap;
}
.main-nav a:hover{color:var(--text);background:var(--surface-2)}
.main-nav a.active{color:var(--accent);background:var(--accent-soft)}

/* Nav dropdown */
.nav-dropdown{position:relative}
.nav-dropdown summary{
  padding:8px 14px;border-radius:var(--radius-md);
  color:var(--text-soft);font-size:.9rem;font-weight:500;
  display:inline-flex;align-items:center;gap:5px;
  cursor:pointer;list-style:none;user-select:none;
}
.nav-dropdown summary::-webkit-details-marker{display:none}
.nav-dropdown summary:hover{color:var(--text);background:var(--surface-2)}
.nav-dropdown summary.active{color:var(--accent);background:var(--accent-soft)}
.nav-dropdown-panel{
  position:absolute;top:calc(100% + 8px);left:50%;transform:translateX(-50%);
  min-width:160px;width:max-content;
  background:var(--surface);border:1px solid var(--line);
  border-radius:var(--radius-lg);box-shadow:var(--shadow-lg);
  padding:4px;z-index:1100;display:none;flex-direction:column;gap:1px;
  animation:menuFadeIn .2s ease;
}
.nav-dropdown[open] .nav-dropdown-panel{display:flex}
.nav-dropdown-item{
  display:flex;align-items:center;gap:8px;padding:8px 10px;
  border-radius:var(--radius-sm);font-size:.9rem;font-weight:500;
  color:var(--text);white-space:nowrap;
}
.nav-dropdown-item:hover{background:var(--surface-2)}
.nav-dropdown-item.active{color:var(--accent);background:var(--accent-soft)}
.nav-dropdown-icon{display:inline-flex;align-items:center;justify-content:center;width:16px;height:16px;flex-shrink:0}
.nav-dropdown-item .icon-img{width:16px;height:16px;opacity:.65}
.nav-dropdown-item.active .icon-img{opacity:1}

/* Header actions */
.header-actions{display:flex;align-items:center;gap:8px;margin-left:auto}

/* User chip */
.user-chip{
  display:flex;align-items:center;gap:8px;
  padding:5px 10px 5px 5px;
  border-radius:999px;
  border:1px solid var(--line);
  background:var(--surface);
  color:var(--text);cursor:pointer;
}
.user-chip:hover{background:var(--surface-2);border-color:var(--line-strong)}
.user-avatar{
  width:28px;height:28px;border-radius:50%;
  display:grid;place-items:center;
  background:var(--accent);
  font-weight:600;color:#fff;font-size:.8rem;flex-shrink:0;
}
.user-avatar-img{object-fit:cover}
.user-name{font-size:.88rem;font-weight:500}
.chevron-menu{display:flex;align-items:center;color:var(--text-soft);transition:transform .2s ease}
.user-menu-wrap[open] .chevron-menu{transform:rotate(180deg)}

/* Notification trigger */
.notification-trigger{
  display:flex;align-items:center;justify-content:center;
  width:36px;height:36px;border-radius:var(--radius-md);
  color:var(--text-soft);position:relative;
}
.notification-trigger:hover{background:var(--surface-2);color:var(--text)}
.notification-trigger .icon-img{width:20px;height:20px}

/* User menu */
.user-menu-wrap{position:relative}
.user-menu-wrap summary{list-style:none}
.user-menu-wrap summary::-webkit-details-marker{display:none}
.user-menu-wrap[open] .user-menu{display:flex}
.user-menu{
  position:absolute;top:calc(100% + 8px);right:0;width:260px;
  background:var(--surface);border:1px solid var(--line);
  border-radius:var(--radius-lg);box-shadow:var(--shadow-lg);
  padding:8px;z-index:1100;
  display:none;flex-direction:column;gap:1px;
  animation:menuFadeIn .2s ease;
}
.user-menu::before{
  content:"";position:absolute;top:-6px;right:22px;
  width:11px;height:11px;transform:rotate(45deg);
  background:var(--surface);border-left:1px solid var(--line);border-top:1px solid var(--line);
}

/* User menu header */
.user-menu-header{
  display:flex;align-items:center;gap:10px;
  padding:10px 10px 12px;
  border-bottom:1px solid var(--line);
  margin-bottom:4px;
}
.user-menu-avatar{
  width:40px;height:40px;border-radius:10px;
  background:var(--accent);color:#fff;
  display:flex;align-items:center;justify-content:center;
  font-weight:600;font-size:1.1rem;flex-shrink:0;
}
.user-menu-avatar img{width:100%;height:100%;object-fit:cover;border-radius:inherit}
.user-menu-details{display:flex;flex-direction:column;min-width:0}
.user-menu-name{font-size:.95rem;font-weight:600;color:var(--text);
  white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.user-menu-email{font-size:.78rem;color:var(--text-soft);
  white-space:nowrap;overflow:hidden;text-overflow:ellipsis}

/* Menu items */
.menu-section{padding:2px 0}
.menu-label{
  display:block;font-size:.72rem;font-weight:600;
  color:var(--text-xsoft);text-transform:uppercase;
  letter-spacing:.06em;padding:8px 10px 4px;
}
.menu-item{
  display:flex;align-items:center;gap:10px;
  padding:9px 10px;border-radius:var(--radius-sm);
  font-size:.9rem;font-weight:500;color:var(--text);
  width:100%;text-align:left;background:transparent;
  border:none;font-family:inherit;cursor:pointer;
}
.menu-item:hover{background:var(--surface-2)}
.menu-item .icon-img{width:18px;height:18px;opacity:.6;flex-shrink:0}
.menu-item:hover .icon-img{opacity:.9}
.menu-item.disabled{opacity:.45;pointer-events:none}
.menu-item.disabled::after{
  content:'Soon';margin-left:auto;
  font-size:.68rem;background:var(--surface-3);
  color:var(--text-soft);padding:2px 6px;border-radius:4px;
}
.menu-divider{height:1px;background:var(--line);margin:4px 0}
.logout-item{color:var(--danger)}
.logout-item:hover{background:var(--danger-soft)}
.logout-item .icon-img{opacity:.7}

.icon-img{width:18px;height:18px;display:inline-block;vertical-align:middle;flex-shrink:0}

@keyframes menuFadeIn{
  from{opacity:0;transform:translateY(6px)}
  to{opacity:1;transform:translateY(0)}
}

/* Account badge */
.account-badge{
  font-size:.68rem;font-weight:600;background:var(--surface-3);
  color:var(--text-soft);padding:2px 7px;border-radius:4px;
}

/* Lang / theme modals */
.lang-modal{
  position:fixed;inset:0;z-index:2000;
  display:flex;align-items:center;justify-content:center;padding:20px;
  visibility:hidden;opacity:0;transition:all .25s ease;
}
.lang-modal[open]{visibility:visible;opacity:1}
.lang-modal-backdrop{position:absolute;inset:0;background:rgba(0,0,0,.35)}
.lang-modal-dialog{
  position:relative;width:100%;max-width:360px;
  background:var(--surface);border-radius:var(--radius-xl);
  box-shadow:var(--shadow-lg);padding:24px;text-align:center;
  transform:translateY(12px);transition:transform .25s cubic-bezier(.16,1,.3,1);
}
.lang-modal[open] .lang-modal-dialog{transform:translateY(0)}
.lang-list{display:grid;gap:8px;margin-top:16px}
.lang-option{
  display:flex;align-items:center;justify-content:space-between;
  padding:13px 16px;background:var(--surface-2);
  border:1px solid var(--line);border-radius:var(--radius-md);
  cursor:pointer;width:100%;text-align:left;
  transition:border-color .15s ease,background .15s ease;
  font-family:inherit;
}
.lang-option:hover{border-color:var(--accent);background:var(--accent-soft)}
.lang-option.active{border-color:var(--accent);background:var(--accent-soft)}
.lang-option strong{font-size:.95rem;font-weight:600;color:var(--text)}
.lang-option span{font-size:.82rem;color:var(--text-soft)}

.theme-option-info{display:flex;align-items:center;gap:12px}
.theme-swatch{display:inline-block;width:30px;height:30px;border-radius:8px;border:1px solid var(--line);flex-shrink:0}
.theme-swatch-default{background:linear-gradient(135deg,#fff 50%,#e67e22 50%)}
.theme-swatch-green{background:linear-gradient(135deg,#fff 50%,#16a34a 50%)}
.theme-option .theme-check{opacity:0}
.theme-option.active .theme-check{opacity:1}
.theme-option.active{border-color:var(--accent);background:var(--accent-soft)}

/* Landing page transparent header */
.site-header-public{
  position:absolute;top:0;left:0;right:0;
  background:transparent;border-bottom:none;
}
.site-header-public .main-nav a{color:rgba(255,255,255,.8)}
.site-header-public .main-nav a:hover{color:#fff;background:rgba(255,255,255,.12)}

/* Tablet */
@media(max-width:1024px){
  .main-nav{gap:0;margin-left:16px}
  .main-nav a{padding:7px 10px;font-size:.88rem}
  .nav-dropdown summary{padding:7px 10px;font-size:.88rem}
}

/* Mobile — hide header for logged-in users (bottom tab handles nav) */
@media(max-width:760px){
  .app-auth-body .site-header{display:none}

  /* 未登入保留小 header */
  .public-body .site-header{height:52px}
  .public-body .brand-copy small{display:none}
  .public-body .main-nav{display:none}
}