/* 生成物：由 tools/web/sync-prototype-css.mjs 从 docs/prototypes/2026-09-21-阳光玻璃忠实延展/topbar-interactions.css 逐字复制，勿手改。
   原型是唯一视觉真值；要改视觉先改原型，再跑 `node tools/web/sync-prototype-css.mjs .` 同步。 */
/* 产品顶栏与二级导航共用玻璃反馈；不改冻结样张。使用可反向的过渡，快速移出／重入连续。 */
/* 4px 工具间距 + 4px 头像内边距，主题按钮与头像图像相距 8px。 */
.topbar .tools > .theme-toggle + .user {
  margin-left: 0;
}

:is(.discovery-tabs, .projects-primary nav) > :is(a, [aria-current="page"]),
.topbar .nav a,
.topbar .tools :is(.icon-btn, .user, .btn-ghost) {
  position: relative;
  isolation: isolate;
  background: transparent;
  transition: color 220ms var(--m-ease-out), transform 440ms var(--m-spring-smooth);
}
:is(.discovery-tabs, .projects-primary nav) > :is(a, [aria-current="page"])::before,
.topbar .nav a::before,
.topbar .tools :is(.icon-btn, .user, .btn-ghost)::before {
  content: "";
  position: absolute;
  z-index: -1;
  inset: 0;
  border-radius: inherit;
  background: linear-gradient(145deg, var(--b-glass-edge-b), transparent 64%),
    radial-gradient(ellipse at 50% 0%, var(--b-primary-tint), var(--b-neutral-tint));
  box-shadow: inset 0 1px 0 var(--b-glass-edge-a),
    inset 0 0 0 1px var(--b-glass-edge-b),
    0 3px 8px -4px var(--b-card-shadow-far);
  opacity: 0;
  transform: translateY(2px) scale(.94);
  transition: opacity 360ms var(--m-ease-out), transform 440ms var(--m-spring-smooth);
  pointer-events: none;
}
.topbar .tools .btn-primary {
  transition: background-color 220ms var(--m-ease-out), box-shadow 360ms var(--m-ease-out), transform 440ms var(--m-spring-smooth);
}
.topbar .tools .icon-btn svg {
  transition: transform 440ms var(--m-spring-smooth);
  transform-origin: center;
}
.topbar .brand {
  position: relative;
  isolation: isolate;
  border-radius: var(--b-radius-chip);
}
.topbar .brand::before {
  content: "";
  position: absolute;
  z-index: -1;
  width: 42px;
  height: 42px;
  left: -7px;
  top: calc(50% - 21px);
  border-radius: 50%;
  background: radial-gradient(circle, var(--b-primary-tint) 12%, transparent 72%);
  opacity: 0;
  transform: scale(.8);
  transition: opacity 460ms var(--m-ease-out), transform 540ms var(--m-spring-smooth);
  pointer-events: none;
}
.topbar .brand .logo {
  transform-origin: 50% 80%;
  transform: translateY(0) rotate(0) scale(1);
  filter: drop-shadow(0 0 0 transparent);
  transition: transform 580ms var(--m-spring-smooth), filter 460ms var(--m-ease-out);
}
.topbar :is(.brand, .nav a, .tools .icon-btn, .tools .user, .tools .btn):focus-visible {
  outline: 2px solid var(--b-focus);
  outline-offset: 3px;
}
:is(.discovery-tabs, .projects-primary nav) > :is(a, [aria-current="page"]):focus-visible::before,
.topbar :is(.brand, .nav a, .tools .icon-btn, .tools .user, .tools .btn):focus-visible::before {
  opacity: 1;
  transform: none;
}
@media (hover: hover) and (pointer: fine) {
  :is(.discovery-tabs, .projects-primary nav) > :is(a, [aria-current="page"]):not([aria-disabled="true"]):hover,
  .topbar .nav a:not([aria-disabled="true"]):hover,
  .topbar .tools :is(.icon-btn, .user, .btn-ghost):not(:disabled):not([aria-disabled="true"]):hover {
    color: var(--b-text-1);
    transform: translateY(-1px);
    transition-duration: 180ms, 260ms;
  }
  .topbar .tools .btn-primary:not(:disabled):hover {
    transform: translateY(-1px);
    transition-duration: 180ms;
  }
  :is(.discovery-tabs, .projects-primary nav) > :is(a, [aria-current="page"]):not([aria-disabled="true"]):hover::before,
  .topbar .nav a:not([aria-disabled="true"]):hover::before,
  .topbar .tools :is(.icon-btn, .user, .btn-ghost):not(:disabled):not([aria-disabled="true"]):hover::before {
    opacity: 1;
    transform: none;
    transition-duration: 180ms, 260ms;
  }
  .topbar .tools .icon-btn:not(:disabled):not([aria-disabled="true"]):hover svg {
    transform: scale(1.08);
    transition-duration: 300ms;
  }
  .topbar .tools .theme-toggle:not(:disabled):hover svg {
    transform: rotate(18deg) scale(1.08);
  }
  .topbar .brand:hover::before {
    opacity: 1;
    transform: scale(1.12);
    transition-duration: 220ms, 420ms;
  }
  .topbar .brand:hover .logo {
    transform: translateY(-2px) rotate(-10deg) scale(1.16);
    filter: drop-shadow(0 3px 4px var(--b-card-shadow-far));
    transition-duration: 420ms, 300ms;
  }
}
:is(.discovery-tabs, .projects-primary nav) > :is(a, [aria-current="page"]):not([aria-disabled="true"]):active,
.topbar .tools .btn-primary:not(:disabled):active,
.topbar .nav a:not([aria-disabled="true"]):active,
.topbar .tools :is(.icon-btn, .user, .btn-ghost):not(:disabled):not([aria-disabled="true"]):active {
  transform: translateY(0) scale(.97);
  transition-duration: 100ms;
}
.topbar .brand:active .logo {
  transform: translateY(1px) rotate(-3deg) scale(1.04);
  transition-duration: 100ms;
}
/* 未开放入口保持静态，避免将装饰反馈误解为可操作。 */
.topbar :is(.nav a[aria-disabled="true"], .tools :disabled, .tools [aria-disabled="true"]) {
  background: transparent;
  transform: none;
}
.topbar :is(.nav a[aria-disabled="true"], .tools :disabled, .tools [aria-disabled="true"])::before {
  content: none;
}
.topbar .nav a[aria-disabled="true"],
.topbar .tools .icon-btn:disabled,
.topbar .tools .icon-btn[aria-disabled="true"] {
  color: var(--b-text-2);
}
@media (prefers-reduced-motion: reduce) {
  :is(.discovery-tabs, .projects-primary nav) > :is(a, [aria-current="page"]),
  :is(.discovery-tabs, .projects-primary nav) > :is(a, [aria-current="page"])::before,
  .topbar .nav a,
  .topbar .tools .btn-primary,
  .topbar .tools :is(.icon-btn, .user, .btn-ghost),
  .topbar .tools .icon-btn svg,
  .topbar .brand .logo,
  .topbar .brand::before,
  .topbar .nav a::before,
  .topbar .tools :is(.icon-btn, .user, .btn-ghost)::before {
    transition: none !important;
    transform: none !important;
  }
}

@media (max-width: 700px) {
  .topbar .nav a:focus-visible {
    outline-offset: -2px;
    box-shadow: none;
  }
}

/* 头像菜单使用 top layer，避免被磨砂顶栏、页面追光或内容卡片截断。 */
.account-menu {
  position: fixed;
  inset: auto;
  margin: 0;
  width: 192px;
  max-width: calc(100vw - 24px);
  padding: 6px;
  border: 1px solid var(--b-glass-line);
  border-radius: 16px;
  color: var(--b-text-1);
  background: var(--b-glass-bg-thick);
  backdrop-filter: blur(30px) saturate(1.4);
  box-shadow: inset 0 1px 0 var(--b-glass-edge-a), var(--b-glass-shadow);
  opacity: 0;
  transform: translateY(-4px);
  transition: opacity 140ms ease, transform 180ms var(--m-ease-out),
    display 180ms allow-discrete, overlay 180ms allow-discrete;
}
.account-menu:popover-open { opacity: 1; transform: none; }
.account-menu .account-menu-item {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  min-height: 44px;
  padding: 10px 12px;
  border-radius: 10px;
  font-size: 13px;
  font-weight: 500;
  color: var(--b-text-2);
  text-align: left;
  text-decoration: none;
  transition: background-color 180ms ease, color 180ms ease;
}
.account-menu-item svg { width: 18px; height: 18px; fill: none; stroke: currentColor; stroke-width: 1.5; stroke-linecap: round; stroke-linejoin: round; }
.account-menu .account-menu-item:hover,
.account-menu .account-menu-item:focus-visible { outline: none; background: var(--b-neutral-tint); color: var(--b-text-1); }
.account-menu .account-menu-item:focus-visible { box-shadow: inset 0 0 0 1px var(--b-focus); }
.account-menu .account-menu-signout { color: var(--b-danger); }
.account-menu .account-menu-signout:is(:hover,:focus-visible) { color: var(--b-danger); background: color-mix(in srgb, var(--b-danger) 7%, transparent); }
.account-menu-divider { height: 1px; margin: 4px 10px; background: var(--b-glass-line); }
.topbar .user .chev { transition: transform 180ms var(--m-ease-out); }
.topbar .user[aria-expanded="true"] .chev { transform: rotate(180deg); }
.topbar .user[aria-expanded="true"]::before { opacity: 1; transform: none; }

.account-signout-dialog {
  position: fixed;
  inset: 0;
  margin: auto;
  width: min(400px, calc(100vw - 32px));
  max-height: calc(100dvh - 32px);
  overflow: auto;
  padding: 26px;
  border: 1px solid var(--b-glass-line);
  border-radius: var(--b-radius-sheet);
  color: var(--b-text-1);
  background: var(--b-glass-frost);
  box-shadow: var(--b-glass-shadow-thick);
  opacity: 0;
  transform: translateY(6px);
  transition: opacity 160ms ease, transform 200ms var(--m-ease-out),
    display 200ms allow-discrete, overlay 200ms allow-discrete;
}
.account-signout-dialog[open] { opacity: 1; transform: none; }
.account-signout-dialog::backdrop {
  background: rgb(0 0 0 / .22);
  opacity: 0;
  transition: opacity 180ms ease, display 200ms allow-discrete, overlay 200ms allow-discrete;
}
.account-signout-dialog[open]::backdrop { opacity: 1; }
.account-signout-dialog h2 { margin: 0 0 12px; font-size: 20px; font-weight: 600; }
.account-signout-dialog p { font-size: 14px; line-height: 1.75; color: var(--b-text-2); }
.account-signout-dialog .account-signout-note { margin-top: 8px; font-size: 12px; color: var(--b-text-3); }
.account-signout-dialog footer { display: flex; justify-content: flex-end; gap: 10px; margin-top: 24px; }
@starting-style {
  .account-menu:popover-open { opacity: 0; transform: translateY(-4px); }
  .account-signout-dialog[open] { opacity: 0; transform: translateY(6px); }
  .account-signout-dialog[open]::backdrop { opacity: 0; }
}
@media (max-width: 700px) {
  .topbar .tools .user[data-account-toggle] { display: inline-flex; padding: 0 4px; margin-left: 0; min-height: 40px; }
  .topbar .tools .user[data-account-toggle] :is(span,.chev) { display: none; }
  .topbar .tools:has([data-account-toggle]) { gap: 4px; }
}
@media (prefers-reduced-motion: reduce) {
  .account-menu, .account-menu .account-menu-item, .topbar .user .chev,
  .account-signout-dialog, .account-signout-dialog::backdrop { transition: none; transform: none; }
}