/* ==========================================================================
   ux.css — 站点交互层（U20）
   --------------------------------------------------------------------------
   只做「观感与手感」，不改任何内容与布局尺寸：
     · 主题切换按钮（由 theme.js 注入）
     · 指针跟随光环（桌面、可精细指向、非降级动效）
     · 点击水波纹、磁吸按钮、卡片倾斜
     · 顶部滚动进度轨
     · 快捷键浮层（?）
   硬约束：不引用远程资源；不注入文字；prefers-reduced-motion 与触屏全部
   关掉；新增的固定层必须 position:fixed（.dev 的溢出审计会跳过固定层）。
   ========================================================================== */

/* -------------------------------------------------- 0. 主题切换按钮 */

.theme-btn {
  flex: 0 0 auto;
  display: inline-grid;
  place-items: center;
  width: 34px;
  height: 34px;
  padding: 0;
  border: 1px solid var(--tech-hair-2);
  border-radius: var(--radius-sm);
  background-color: color-mix(in srgb, var(--tech-blue) 4%, var(--tech-glass-2));
  color: var(--ink-soft);
  cursor: pointer;
  transition: color .18s ease, border-color .18s ease, background-color .18s ease, box-shadow .18s ease;
}
.theme-btn:hover {
  color: var(--tech-blue-deep);
  border-color: var(--tech-blue);
  box-shadow: var(--tech-glow-sm);
}
.theme-btn:focus-visible { outline: none; box-shadow: var(--focus-ring); }
.theme-ico {
  width: 17px;
  height: 17px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.5;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.theme-ico.i-moon { fill: currentColor; stroke: none; }
.theme-ico.i-sun { display: none; }
:root[data-theme="dark"] .theme-ico.i-moon { display: none; }
:root[data-theme="dark"] .theme-ico.i-sun { display: block; }

/* 切换的一瞬间才开颜色过渡，避免加载时满屏渐变 */
html.theme-anim,
html.theme-anim *,
html.theme-anim *::before,
html.theme-anim *::after {
  transition:
    background-color .3s ease,
    border-color .3s ease,
    color .3s ease,
    fill .3s ease,
    stroke .3s ease,
    box-shadow .3s ease !important;
}

/* -------------------------------------------------- 1. 指针：三层自绘 ----- */
/* 晕（最慢，一团跟光）+ 准星（跟着速度前倾）+ 点（最快，指哪到哪）。
   三个都是 position:fixed + transform：不进布局、不进溢出统计。
   自绘指针一旦接管，原生指针在这些地方就藏起来 —— 但打字、取色、拖舞台例外，
   那里的坐标精度比气氛重要。 */

.cursor-halo,
.cursor-ring,
.cursor-dot {
  position: fixed;
  left: 0;
  top: 0;
  display: none;
  pointer-events: none;
  will-change: transform;
}
html.cursor-on .cursor-halo,
html.cursor-on .cursor-ring,
html.cursor-on .cursor-dot { display: block; }

html.cursor-on,
html.cursor-on * { cursor: none; }
html.cursor-on input,
html.cursor-on textarea,
html.cursor-on select,
html.cursor-on canvas,
html.cursor-on [contenteditable] { cursor: auto; }
html.cursor-on input[type="text"],
html.cursor-on input[type="search"],
html.cursor-on input[type="number"],
html.cursor-on input[type="password"],
html.cursor-on input[type="url"],
html.cursor-on input[type="email"],
html.cursor-on input[type="date"],
html.cursor-on input[type="time"],
html.cursor-on input[type="color"],
html.cursor-on input:not([type]) { cursor: text; }
html.cursor-on input[type="range"],
html.cursor-on input[type="checkbox"],
html.cursor-on input[type="radio"],
html.cursor-on .stage.hero canvas { cursor: default; }
html.cursor-on .stage.is-dragging canvas { cursor: grabbing; }

.cursor-halo {
  z-index: 88;
  width: 200px;
  height: 200px;
  margin: -100px 0 0 -100px;
  border-radius: 50%;
  background: radial-gradient(
    circle,
    color-mix(in srgb, var(--tech-blue) 18%, transparent),
    color-mix(in srgb, var(--tech-cyan-2) 9%, transparent) 44%,
    transparent 70%
  );
  /* 旧版 260px + mix-blend-mode: screen —— 每帧要对一整块背景做混合，
     是「鼠标不跟手」的成本项之一。改成小一圈的纯叠加，观感几乎不变。 */
}

.cursor-ring {
  z-index: 90;
  width: 30px;
  height: 30px;
  margin: -15px 0 0 -15px;
  border-radius: 50%;
  border: 1px solid var(--tech-line-2);
  background: color-mix(in srgb, var(--tech-blue) 5%, transparent);
  box-shadow: 0 0 0 0 color-mix(in srgb, var(--tech-blue) 16%, transparent);
  transition: width .24s var(--ease-out), height .24s var(--ease-out),
              margin .24s var(--ease-out), background-color .2s ease,
              border-color .2s ease, box-shadow .24s var(--ease-out), opacity .25s ease;
}
/* 2026-10-16 用户反馈（m02015）：「不要十字准星，就纯那个圆形就很舒服」——
   原来画在 .cursor-ring::before/::after 上的两条十字线（竖 + 横、148% 高）已删除。
   圆环自己就是准星，不要再往里加线；要强调可点元素请用 .is-hot 的放大与外晕。 */

.cursor-dot {
  z-index: 91;
  width: 5px;
  height: 5px;
  margin: -2.5px 0 0 -2.5px;
  border-radius: 50%;
  background: var(--tech-blue);
  box-shadow: 0 0 8px 0 color-mix(in srgb, var(--tech-blue) 70%, transparent);
}

/* 悬停可点元素：光环张开、加一圈外晕（位置仍由 transform 负责） */
.cursor-ring.is-hot {
  width: 46px;
  height: 46px;
  margin: -23px 0 0 -23px;
  border-color: var(--tech-blue);
  background: color-mix(in srgb, var(--tech-blue) 11%, transparent);
  box-shadow: 0 0 0 5px color-mix(in srgb, var(--tech-blue) 9%, transparent);
}
html.cursor-idle .cursor-halo,
html.cursor-idle .cursor-ring,
html.cursor-idle .cursor-dot { opacity: 0; }

/* 首屏舞台是拖拽面（hero.js 的拖动转齿轮）：里面的文字一律不参与选区，
   否则同一次拖动会把标题/正文一起选中（用户反馈「两个会一起」）。
   html.stage-drag 由 ux.js 的 initStageGuard() 在拖动期间挂上并扩到全页，
   指针拖到舞台之外也不会长出一段选区。 */
.stage.hero,
.stage.hero * { -webkit-user-select: none; user-select: none; }
html.stage-drag,
html.stage-drag * { -webkit-user-select: none !important; user-select: none !important; }

/* -------------------------------------------------- 2. 点击水波纹 */

.rp {
  position: absolute;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  transform: translate(-50%, -50%) scale(0);
  background: currentColor;
  opacity: .3;
  pointer-events: none;
  animation: ux-ripple .58s ease-out forwards;
}
@keyframes ux-ripple {
  to { transform: translate(-50%, -50%) scale(14); opacity: 0; }
}
.rp-host { position: relative; overflow: hidden; }

/* -------------------------------------------------- 3. 磁吸 / 倾斜 */

.magnetize { transition: transform .22s cubic-bezier(.2, .7, .2, 1); will-change: transform; }
.tilting { transition: transform .28s cubic-bezier(.2, .7, .2, 1); will-change: transform; }
.tilting.is-tilting { transition: transform .06s linear; }

/* -------------------------------------------------- 4. 滚动进度轨 */

.scroll-rail {
  position: fixed;
  left: 0;
  top: 0;
  z-index: 85;
  width: 100%;
  height: 2px;
  pointer-events: none;
  background: transparent;
}
.scroll-rail i {
  display: block;
  width: 0;
  height: 100%;
  background-image: var(--tech-grad);
  box-shadow: 0 0 10px 0 var(--tech-glow);
  transition: width .1s linear;
}
html:not(.js) .scroll-rail { display: none; }

/* -------------------------------------------------- 5. 快捷键浮层（纯静态 DOM，JS 只切类） */

.keys-overlay {
  position: fixed;
  inset: 0;
  z-index: 96;
  display: grid;
  place-items: center;
  padding: var(--gutter);
  background: color-mix(in srgb, var(--tech-ink) 46%, transparent);
  -webkit-backdrop-filter: blur(6px);
          backdrop-filter: blur(6px);
  opacity: 0;
  visibility: hidden;
  transition: opacity .2s ease, visibility .2s ease;
}
.keys-overlay.is-open { opacity: 1; visibility: visible; }
.keys-panel {
  width: min(440px, 100%);
  max-height: 76vh;
  overflow: auto;
  padding: 22px 24px 20px;
  border: 1px solid var(--tech-hair-2);
  border-radius: var(--radius-lg);
  background: var(--surface);
  box-shadow: var(--tech-glow-md);
  transform: translateY(8px) scale(.985);
  transition: transform .24s cubic-bezier(.2, .7, .2, 1);
}
.keys-overlay.is-open .keys-panel { transform: none; }
.keys-panel h2 {
  margin: 0 0 4px;
  font-size: 1rem;
  letter-spacing: .04em;
  color: var(--tech-deep);
}
.keys-panel p { margin: 0 0 16px; color: var(--muted); font-size: var(--fs-sm); }
.keys-list { display: grid; gap: 9px; margin: 0; }
.keys-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  font-size: var(--fs-sm);
  color: var(--ink-soft);
}
.keys-row kbd {
  flex: 0 0 auto;
  min-width: 34px;
  padding: 3px 8px;
  border: 1px solid var(--tech-hair-2);
  border-bottom-width: 2px;
  border-radius: var(--radius-sm);
  background: var(--surface-2);
  font-family: var(--font-mono);
  font-size: 11.5px;
  text-align: center;
  color: var(--tech-blue-deep);
}
.keys-close {
  margin-top: 18px;
  width: 100%;
  padding: 8px 12px;
  border: 1px solid var(--tech-hair-2);
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--ink-soft);
  font: inherit;
  font-size: var(--fs-sm);
  cursor: pointer;
}
.keys-close:hover { border-color: var(--tech-blue); color: var(--tech-blue-deep); }

/* -------------------------------------------------- 6. 卡面：光斑 + 扫光 --- */
/* 一团跟着指针的浅光（读 ux.js 写的 --mx / --my 百分比）＋ 一条斜向扫光带。
   两者都画在 ::before / ::after 上，配 isolation:isolate + z-index:-1：
   落在自身底色之上、文字之下，所以不会降低任何文字的对比度。
   首页的工具行 / 作品卡已有 motion.css 的同款光斑，这里只补它没覆盖的部分。 */

html.js:not(.no-motion) .card,
html.js:not(.no-motion) .tool-row,
html.js:not(.no-motion) .work,
html.js:not(.no-motion) .btn-primary,
html.js:not(.no-motion) .sec-more {
  position: relative;
  isolation: isolate;
}

html.js:not(.no-motion) .card::after,
html.js:not(.no-motion) body:not([data-page="home"]) .tool-row::after,
html.js:not(.no-motion) body:not([data-page="home"]) .work::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  border-radius: inherit;
  opacity: 0;
  transition: opacity var(--dur-2) var(--ease-out);
  background: radial-gradient(220px circle at var(--mx, 50%) var(--my, 50%), var(--line), transparent 70%);
}
html.js:not(.no-motion) .card:hover::after,
html.js:not(.no-motion) .card:focus-within::after,
html.js:not(.no-motion) body:not([data-page="home"]) .tool-row:hover::after,
html.js:not(.no-motion) body:not([data-page="home"]) .work:hover::after { opacity: 1; }

/* 扫光：一条 105° 的光带用 background-position 横穿元素 ——
   不越界（所以不需要 overflow:hidden）、不加 DOM、不碰布局。 */
html.js:not(.no-motion) .card::before,
html.js:not(.no-motion) .tool-row::before,
html.js:not(.no-motion) .work::before,
html.js:not(.no-motion) .btn-primary::before,
html.js:not(.no-motion) .sec-more::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  border-radius: inherit;
  background-image: linear-gradient(
    105deg,
    transparent 36%,
    color-mix(in srgb, var(--tech-blue) 15%, transparent) 50%,
    transparent 64%
  );
  background-size: 260% 100%;
  background-position: 145% 0;
  background-repeat: no-repeat;
  transition: background-position var(--dur-3) var(--ease-glide);
}
html.js:not(.no-motion) .card:hover::before,
html.js:not(.no-motion) .tool-row:hover::before,
html.js:not(.no-motion) .work:hover::before,
html.js:not(.no-motion) .btn-primary:hover::before,
html.js:not(.no-motion) .btn-primary:focus-visible::before,
html.js:not(.no-motion) .sec-more:hover::before { background-position: -45% 0; }

/* -------------------------------------------------- 7. 导航与按压 --------- */
/* 下划线改成从中间往两头长（原来是从左往右单向生长）；滚动后导航浮起来 */

.nav-links a {
  background-position: center bottom;
  transition: color .18s ease, background-size var(--dur-2) var(--ease-glide);
}
.nav-links a:hover,
.nav-links a:focus-visible { background-size: 100% 2px; }
.nav.is-scrolled {
  box-shadow: 0 14px 34px -26px color-mix(in srgb, var(--tech-blue) 70%, transparent);
}

/* 按下：整体下沉 1px 再收一点（沿用元素自己的 transition，不抢它的其它过渡） */
html.js:not(.no-motion) .btn:active,
html.js:not(.no-motion) .btn-primary:active,
html.js:not(.no-motion) .sec-more:active,
html.js:not(.no-motion) .keys-close:active { transform: translateY(1px) scale(.985); }

/* 触摸屏 / 减少动效 / 打印：以上新东西一律退场 */
@media (hover: none), (pointer: coarse) {
  .cursor-halo { display: none !important; }
}
@media (prefers-reduced-motion: reduce) {
  .cursor-halo { display: none !important; }
  .card::before, .tool-row::before, .work::before, .btn-primary::before, .sec-more::before,
  .card::after, .tool-row::after, .work::after { display: none !important; }
}
@media print {
  .cursor-halo { display: none !important; }
  .card::before, .tool-row::before, .work::before, .btn-primary::before, .sec-more::before,
  .card::after, .tool-row::after, .work::after { display: none !important; }
}

/* -------------------------------------------------- 8. 交错入场（纯 CSS 延迟，无 JS） */

[data-stagger] > *:nth-child(1) { transition-delay: .02s; }
[data-stagger] > *:nth-child(2) { transition-delay: .07s; }
[data-stagger] > *:nth-child(3) { transition-delay: .12s; }
[data-stagger] > *:nth-child(4) { transition-delay: .17s; }
[data-stagger] > *:nth-child(5) { transition-delay: .22s; }
[data-stagger] > *:nth-child(6) { transition-delay: .27s; }
[data-stagger] > *:nth-child(7) { transition-delay: .32s; }
[data-stagger] > *:nth-child(n+8) { transition-delay: .36s; }

/* -------------------------------------------------- 9. 本页目录侧轨（U24 第 2 轮） */
/* 由 ux.js 的 initToc() 生成：页面里 ≥3 个 .sec-head 时才出现，
   固定在视口右侧竖直居中，当前章节的那一段拉长并用强调色。 */

.toc-rail {
  position: fixed;
  right: 16px;
  top: 50%;
  z-index: 60;
  display: flex;
  flex-direction: column;
  gap: 10px;
  transform: translateY(-50%);
}

.toc-dot {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  width: 24px;
  height: 12px;
  padding: 0;
  border: 0;
  background: transparent;
  cursor: pointer;
}

.toc-tick {
  width: 14px;
  height: 2px;
  border-radius: 2px;
  background: color-mix(in srgb, var(--ink) 22%, transparent);
  transition: width var(--dur-2) var(--ease-glide), background-color var(--dur-2) ease;
}

.toc-dot.is-on .toc-tick {
  width: 22px;
  background: var(--tech-blue);
}

.toc-dot:hover .toc-tick {
  background: var(--ink);
}

.toc-label {
  position: absolute;
  right: calc(100% + 6px);
  top: 50%;
  padding: 3px 8px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--bg);
  color: var(--ink);
  font-size: 12px;
  line-height: 1.5;
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transform: translateY(-50%) translateX(4px);
  transition: opacity var(--dur-2) var(--ease-out), transform var(--dur-2) var(--ease-out);
}

.toc-dot:hover .toc-label,
.toc-dot:focus-visible .toc-label {
  opacity: 1;
  transform: translateY(-50%) translateX(0);
}

.toc-dot:focus-visible {
  outline: 2px solid var(--tech-blue);
  outline-offset: 3px;
  border-radius: 3px;
}

@media (max-width: 1180px) {
  .toc-rail { display: none; }
}
@media (prefers-reduced-motion: reduce) {
  .toc-tick, .toc-label { transition: none; }
}
@media print {
  .toc-rail { display: none !important; }
}

/* -------------------------------------------------- 10. 降级与打印 */

@media (hover: none), (pointer: coarse) {
  .cursor-ring, .cursor-dot { display: none !important; }
}
@media (prefers-reduced-motion: reduce) {
  .cursor-ring, .cursor-dot { display: none !important; }
  .rp { display: none; }
  .magnetize, .tilting { transition: none; }
  .keys-overlay, .keys-panel { transition: none; }
  [data-stagger] > * { transition-delay: 0s !important; }
}
@media print {
  .theme-btn, .cursor-ring, .cursor-dot, .scroll-rail, .keys-overlay { display: none !important; }
}

/* -------------------------------------------------- 11. 低画质档（U27） */
/* ux.js 的 initPerf 实测帧时间后加 html.perf-low；也可用 ?perf=low 手动强制。
   这一档只砍「每帧都要重新合成」的东西，布局、层级与信息完全不变。 */

/* 200px 的叠加光晕铺在整页内容之上，是最贵的单件 —— 先砍它 */
html.perf-low .cursor-halo { display: none; }
/* 还要逐帧模糊背景的浮层（命令面板遮罩、快捷键浮层）退回纯色 */
html.perf-low .keys-overlay,
html.perf-low .pal {
  -webkit-backdrop-filter: none;
          backdrop-filter: none;
}
/* 指针跟随仍保留（它是交互反馈），但去掉二次过渡，改成直接贴手 */
html.perf-low .tilting,
html.perf-low .magnetize { transition-duration: .01s; }

/* -------------------------------------------------- 12. 帧率角标（?fps=1） */
/* 手机排查卡顿用：只有 URL 带 ?fps=1 时 ux.js 才建这个节点，平时不存在。
   固定在右上角、不进布局、不拦点击；等宽数字避免读数时抖动。 */

.perf-badge {
  position: fixed;
  top: 8px;
  right: 8px;
  z-index: 95;
  padding: 3px 8px;
  border: 1px solid var(--tech-hair-2);
  border-radius: 999px;
  background-color: color-mix(in srgb, var(--bg) 88%, transparent);
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.4;
  font-variant-numeric: tabular-nums;
  pointer-events: none;
  -webkit-user-select: none;
          user-select: none;
}
@media print { .perf-badge { display: none; } }


/* ==========================================================================
   U31 · 主题切换的圆形揭示 + 折射微光
   --------------------------------------------------------------------------
   支持 View Transitions 时，新主题从主题按钮的位置扩开（clip-path circle）；
   不支持时仍是原来的 420ms 全站颜色渐变（theme.js 自己兜底）。
   ========================================================================== */
html.theme-vt::view-transition-old(root) { animation: none; }
html.theme-vt::view-transition-new(root) {
  animation: theme-reveal .48s cubic-bezier(.2, .9, .2, 1) both;
}
@keyframes theme-reveal {
  from { clip-path: circle(0 at var(--vt-x, 50%) var(--vt-y, 50%)); }
  to   { clip-path: circle(160vmax at var(--vt-x, 50%) var(--vt-y, 50%)); }
}

.theme-prism {
  position: fixed; inset: 0; z-index: 90;
  pointer-events: none;
  background:
    radial-gradient(circle at var(--px, 50%) var(--py, 0%),
      transparent 0 10%,
      color-mix(in srgb, var(--astro-win-warm) 12%, transparent) 16%,
      color-mix(in srgb, var(--astro-win-cool) 14%, transparent) 22%,
      color-mix(in srgb, var(--astro-win-ring) 8%, transparent) 27%,
      transparent 36%);
  animation: theme-prism .52s cubic-bezier(.2, .9, .2, 1) forwards;
}
@keyframes theme-prism {
  from { opacity: .9; transform: scale(.72); }
  to   { opacity: 0; transform: scale(1.35); }
}

/* ==========================================================================
   U31 · 工具页遥测反馈
   状态条从「等待」切到 ok / err 时脉冲一次；输出面板内容到达时淡入；
   复制按钮点完有一条描边扫过。全部只在工具页命中（元素 id 由契约保证）。
   ========================================================================== */
.status.is-pulse {
  animation: tele-ok .72s cubic-bezier(.2, .9, .2, 1);
}
.status.is-pulse-err {
  animation: tele-err .72s cubic-bezier(.2, .9, .2, 1);
}
@keyframes tele-ok {
  0%   { box-shadow: 0 0 0 0 transparent; }
  24%  { box-shadow: 0 0 0 1px color-mix(in srgb, var(--astro-win-warm) 46%, transparent),
                     0 0 24px -8px color-mix(in srgb, var(--astro-win-warm) 50%, transparent); }
  100% { box-shadow: 0 0 0 0 transparent; }
}
@keyframes tele-err {
  0%   { box-shadow: 0 0 0 0 transparent; }
  16%  { box-shadow: 0 0 0 1px color-mix(in srgb, var(--astro-win-amber) 62%, transparent),
                     0 0 26px -8px color-mix(in srgb, var(--astro-win-amber) 60%, transparent); }
  32%  { box-shadow: 0 0 0 0 transparent; }
  48%  { box-shadow: 0 0 0 1px color-mix(in srgb, var(--astro-win-amber) 40%, transparent); }
  100% { box-shadow: 0 0 0 0 transparent; }
}

#output.is-fresh { animation: out-fresh .3s ease-out; }
@keyframes out-fresh {
  from { opacity: .55; }
  to   { opacity: 1; }
}

#btn-copy, [data-copy] { position: relative; }
#btn-copy.is-copied::after, [data-copy].is-copied::after {
  content: "";
  position: absolute; left: 8px; right: 8px; bottom: 3px; height: 1px;
  background: currentColor;
  transform-origin: 0 50%;
  animation: copy-ok .8s cubic-bezier(.2, .9, .2, 1) both;
}
@keyframes copy-ok {
  0%   { transform: scaleX(0); opacity: .9; }
  38%  { transform: scaleX(1); opacity: .7; }
  100% { transform: scaleX(1); opacity: 0; }
}

@media (prefers-reduced-motion: reduce) {
  html.theme-vt::view-transition-new(root) { animation: none; }
  .theme-prism { display: none; }
  .status.is-pulse, .status.is-pulse-err,
  #output.is-fresh, #btn-copy.is-copied::after, [data-copy].is-copied::after { animation: none; }
}