/* ======================================================
   兼容性补齐:
   - 用 @supports 做特性检测:支持 backdrop-filter 的设备走毛玻璃,不支持的走纯色背景
   - inset 在 Safari 14.4 才开始支持,加 fallback top/right/bottom/left
   - prefers-reduced-motion / prefers-color-scheme 双查询保留
   - 移动端安全区用 env(safe-area-inset-*)
   - 触摸屏禁用 300ms 延迟 + 禁用双击缩放:touch-action: manipulation
   ====================================================== */
* { margin: 0; padding: 0; box-sizing: border-box; }
html, body { height: 100%; width: 100%; }

html {
  /* 防止某些 Android 浏览器因溢出横滚 */
  overflow-x: hidden;
  /* 移动端:禁用双击缩放,禁用双指默认手势但不阻止 pinch(可单独管) */
  touch-action: manipulation;
  /* 高 DPI 文字锐化 */
  -webkit-text-size-adjust: 100%;
}

body {
  position: relative;
  overflow: hidden;
  /* 全文不可选中、可复制:展示型页面无所谓,但消除长按 iOS Safari 弹出选择菜单 */
  -webkit-user-select: none;
  user-select: none;
  /* 禁用 iOS Safari 长按链接弹出菜单(只针对 .boost 的图片/链接预览会触发) */
  -webkit-touch-callout: none;
  /* 高 DPI 字体平滑 */
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;

  font-family: -apple-system, "SF Pro Display", BlinkMacSystemFont,
               "Segoe UI", "PingFang SC", "Hiragino Sans GB",
               "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  background:
    radial-gradient(120% 90% at 76% 20%, #0a1a30 0%, transparent 55%),
    radial-gradient(110% 80% at 20% 80%, #081427 0%, transparent 60%),
    linear-gradient(160deg, #050f1f 0%, #0a1e38 55%, #050f1f 100%);
  /* 移动浏览器 100vh 在 URL 栏显示/隐藏时会跳,改用 -webkit-fill-available + dvh 兜底 */
  min-height: 100vh;
  min-height: -webkit-fill-available;
  min-height: 100dvh;
}

/* ================= 模糊光圈流动背景(性能优化版) ================= */
.backdrop {
  position: absolute;
  top: 0; right: 0; bottom: 0; left: 0;   /* inset fallback,旧浏览器也能吃 */
  overflow: hidden;
  z-index: 0;
}

.orbit {
  position: absolute;
  top: -14%; right: -14%; bottom: -14%; left: -14%;
  transform-origin: 50% 50%;
  animation: spin 30s linear infinite;
  will-change: transform;
}
@keyframes spin { from { transform: rotate(0deg); } to { transform: rotate(360deg); } }

.blob { position: absolute; width: 60vw; height: 60vw; border-radius: 50%; }
.b1 { background: radial-gradient(circle, #ff7ed9 0%, #b64bd6 26%, rgba(182,75,214,0) 62%);
      top: 12%; left: 8%; opacity: .7; }
.b2 { background: radial-gradient(circle, #5ce0ff 0%, #2f8fd4 26%, rgba(47,143,212,0) 62%);
      top: 12%; right: 8%; opacity: .7; }
.b3 { background: radial-gradient(circle, #ffe27a 0%, #f0a24b 24%, rgba(240,162,75,0) 60%);
      bottom: 12%; left: 8%; opacity: .65; }
.b4 { background: radial-gradient(circle, #8affc1 0%, #37b98b 24%, rgba(55,185,139,0) 60%);
      bottom: 12%; right: 8%; opacity: .6; }

@media (prefers-reduced-motion: reduce) {
  .orbit, .blob { animation: none !important; }
}

/* ================= kk 透明液态玻璃字 ================= */
.glass-word {
  position: absolute;
  top: 0; right: 0; bottom: 0; left: 0;
  z-index: 2;
  display: grid;
  place-items: center;
  cursor: pointer;
  /* 关键修复:旧 Safari 把 grid 简写拆开处理,保险起见保留显式 display */
}
.ghost {
  width: 88vw;
  max-width: 900px;
  /* 老 Safari 不识别 min(),改用 vw + max-width 双重限制 */
  /* SVG viewBox 1000x440,文字 y=308 font-size 330,导致实际字形
     重心略低于 viewBox 中心 70%处;这里上提 6%让视觉重心贴正中间 */
  transform: translateY(-6%);
  -webkit-transform: translateY(-6%);
}
.ghost svg { width: 100%; height: auto; display: block; }

/* ================= 涟漪 ================= */
.ripple {
  position: fixed;
  width: 40px; height: 40px; border-radius: 50%;
  transform: translate(-50%,-50%) scale(.15);
  background: radial-gradient(circle,
      rgba(255,255,255,0) 18%,
      rgba(255,255,255,.35) 34%,
      rgba(255,255,255,0) 58%);
  filter: blur(4px);
  animation: ripple .8s cubic-bezier(.22,.61,.36,1) forwards;
  pointer-events: none;
  z-index: 9;
  /* 涟漪不应该被父层 transform 影响 position:fixed 已经是视口定位,稳 */
}
.ripple::after {
  content: "";
  position: absolute;
  top: -12%; right: -12%; bottom: -12%; left: -12%;
  border-radius: 50%;
  background: radial-gradient(circle,
      rgba(255,255,255,0) 40%,
      rgba(200,230,255,.28) 62%,
      rgba(255,255,255,0) 78%);
  filter: blur(5px);
}
@keyframes ripple {
  0%   { transform: translate(-50%,-50%) scale(.15); opacity:0; }
  18%  { opacity:.9; }
  100% { transform: translate(-50%,-50%) scale(16); opacity:0; }
}

/* ================= 助力按钮 ================= */
.boost {
  position: absolute;
  left: 50%;
  /* bottom 用 calc + 安全区适配:iPhone 14 Pro 等设备的 Home Indicator 区域 */
  bottom: calc(8vh + env(safe-area-inset-bottom, 0px));
  transform: translateX(-50%);
  z-index: 3;
  display: inline-block;
  padding: 12px 22px;
  /* 移动端最小可点区域 44x44 (Apple HIG / Material) */
  min-height: 44px;
  font-size: 15px;
  font-weight: 500;
  letter-spacing: 0.5px;
  color: rgba(255, 255, 255, 0.92);
  text-decoration: none;
  background: rgba(255, 255, 255, 0.12);
  border: 1px solid rgba(255, 255, 255, 0.28);
  border-radius: 999px;
  /* 毛玻璃:旧 Safari/Chrome 用 -webkit- 前缀 */
  -webkit-backdrop-filter: blur(12px) saturate(140%);
  backdrop-filter: blur(12px) saturate(140%);
  box-shadow: 0 4px 18px rgba(0, 0, 0, 0.18),
              inset 0 1px 0 rgba(255, 255, 255, 0.18);
  transition: transform .18s cubic-bezier(.34, 1.56, .64, 1),
              background .18s ease,
              border-color .18s ease;
  /* 移动端:禁用高亮(尤其是 Android Chrome 长按会出蓝色框) */
  -webkit-tap-highlight-color: transparent;
}
.boost:hover {
  background: rgba(255, 255, 255, 0.18);
  border-color: rgba(255, 255, 255, 0.45);
  transform: translateX(-50%) translateY(-1px);
}
.boost:active {
  transform: translateX(-50%) scale(.96);
}
.boost:focus {
  outline: 2px solid rgba(255, 255, 255, 0.85);
  outline-offset: 3px;
}
/* :focus-visible 旧 Safari/Chrome 不识别,直接用 :focus 双保险 */
.boost:focus:not(:focus-visible) { outline: none; }

@media (prefers-reduced-motion: reduce) {
  .boost { transition: none; }
}

/* 尊重用户偏好:减少动画时涟漪也禁掉 */
@media (prefers-reduced-motion: reduce) {
  .ripple { animation: none !important; display: none; }
}

/* ===== 特性检测兜底:不支持 backdrop-filter 的浏览器走纯色背景 ===== */
@supports not ((backdrop-filter: blur(1px)) or (-webkit-backdrop-filter: blur(1px))) {
  .boost {
    background: rgba(20, 35, 60, 0.85);
    border-color: rgba(255, 255, 255, 0.35);
  }
}

/* ===== 小屏手机适配 ===== */
@media (max-width: 480px) {
  .ghost { width: 92vw; }
  .boost {
    font-size: 14px;
    padding: 11px 20px;
  }
  .blob { width: 80vw; height: 80vw; }
}

/* ===== 横屏手机:按钮别贴底太远 ===== */
@media (max-height: 500px) and (orientation: landscape) {
  .boost { bottom: calc(4vh + env(safe-area-inset-bottom, 0px)); }
}

/* ===== 减少动画时,顺便降一下背景动画频率(可选) ===== */
/* ===== B 组新增:副标题 / Stars 计数 / 语言切换 / Footer / Skip Link ===== */
.subtitle {
  margin: 18px 0 6px;
  font-size: clamp(14px, 1.6vw, 20px);
  font-weight: 300;
  letter-spacing: .35em;
  text-align: center;
  color: rgba(255, 255, 255, .75);
  text-shadow: 0 1px 8px rgba(0, 0, 0, .35);
  pointer-events: none;
  user-select: none;
}

.stats {
  position: absolute;
  left: 50%;
  top: 14%;
  transform: translateX(-50%);
  margin: 0;
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: .35em;
  font-size: clamp(12px, 1.3vw, 15px);
  font-weight: 400;
  color: rgba(220, 235, 255, .85);
  pointer-events: none;
  user-select: none;
  z-index: 3;
}
.stats-count {
  font-variant-numeric: tabular-nums;
  font-weight: 600;
  color: #fff;
  transition: opacity .25s;
}
.stats-count[title] { /* 加载失败时轻微淡化提示 */
  color: rgba(220, 235, 255, .55);
}

.lang-switch {
  position: absolute;
  left: 50%;
  top: 8%;
  transform: translateX(-50%);
  margin: 0;
  display: inline-flex;
  gap: 6px;
  padding: 4px;
  border-radius: 999px;
  z-index: 3;
  background: rgba(255, 255, 255, .08);
  border: 1px solid rgba(255, 255, 255, .18);
  backdrop-filter: blur(14px) saturate(180%);
  -webkit-backdrop-filter: blur(14px) saturate(180%);
  box-shadow:
    0 4px 16px rgba(0, 0, 0, .25),
    inset 0 1px 0 rgba(255, 255, 255, .15);
}
.lang-btn {
  appearance: none;
  -webkit-appearance: none;
  background: transparent;
  border: 0;
  padding: 6px 14px;
  min-height: 32px;
  border-radius: 999px;
  font: inherit;
  font-size: 13px;
  color: rgba(220, 235, 255, .75);
  cursor: pointer;
  transition: background .2s, color .2s, transform .15s;
}
.lang-btn:hover { color: #fff; }
.lang-btn:active { transform: scale(.94); }
.lang-btn[aria-pressed="true"] {
  background: linear-gradient(135deg,
    rgba(255, 255, 255, .22),
    rgba(255, 255, 255, .08));
  color: #fff;
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, .25),
    0 1px 4px rgba(0, 0, 0, .25);
}
.lang-btn:focus-visible {
  outline: 2px solid #5ce0ff;
  outline-offset: 2px;
}

/* footer */
/* 工具箱入口按钮：与 .boost 同款毛玻璃胶囊，但走 normal flow，避免与 boost 重叠 */
/* ================= 侧边工具箱入口 ================= */
.tools-rail {
  position: fixed;
  top: 50%;
  right: 18px;
  transform: translateY(-50%);
  z-index: 5; /* 必须比 .glass-word(z=2) 高,且大于 .ripple(z=3) */
  -webkit-tap-highlight-color: transparent;
}
.tools-rail {
  /* 内部按钮竖排：齿轮在上,文字在下 */
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
}
.tools-btn {
  display: inline-flex;
  flex-direction: column; /* 竖排:齿轮上,文字下 */
  align-items: center;
  justify-content: center;
  gap: 4px;
  padding: 8px 10px;
  min-height: 32px;
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.5px;
  color: rgba(220, 235, 255, 0.92);
  text-decoration: none;
  background: rgba(255, 255, 255, 0.10);
  border: 1px solid rgba(255, 255, 255, 0.26);
  border-radius: 999px;
  -webkit-backdrop-filter: blur(12px) saturate(140%);
  backdrop-filter: blur(12px) saturate(140%);
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.22),
              inset 0 1px 0 rgba(255, 255, 255, 0.18);
  transition: transform .22s cubic-bezier(.34, 1.56, .64, 1),
              background .18s ease,
              border-color .18s ease;
  white-space: nowrap;
}
.tools-btn:hover {
  background: rgba(255, 255, 255, 0.18);
  border-color: rgba(255, 255, 255, 0.45);
  transform: translateX(-2px);
}
.tools-btn:active {
  transform: scale(.96);
}
.tools-btn:focus {
  outline: 2px solid rgba(255, 255, 255, 0.85);
  outline-offset: 3px;
}
.tools-btn:focus:not(:focus-visible) { outline: none; }
.tools-glyph {
  font-size: 14px;
  line-height: 1;
  opacity: 0.9;
}
/* 窄屏:只显示齿轮图标,再小一档 */
@media (max-width: 520px) {
  .tools-label { display: none; }
  .tools-btn { padding: 7px 9px; min-height: 28px; }
  .tools-rail { gap: 4px; }
}
@media (prefers-reduced-motion: reduce) {
  .tools-btn, .tools-btn:hover, .tools-btn:active { transition: none; }
}

.site-foot {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 6px 12px calc(6px + env(safe-area-inset-bottom, 0px));
  text-align: center;
  font-size: 11px;
  color: rgba(220, 235, 255, .45);
  pointer-events: none;
  z-index: 10;
}

/* skip-link:键盘 Tab 时出现,平时藏 */
.skip-link {
  position: absolute;
  top: -100px;
  left: 8px;
  padding: 8px 14px;
  background: #0a1e38;
  color: #fff;
  border: 2px solid #5ce0ff;
  border-radius: 6px;
  text-decoration: none;
  font-size: 14px;
  z-index: 1000;
  transition: top .15s;
}
.skip-link:focus { top: 8px; outline: none; }

/* 错误页 */
.errpage {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 24px;
  text-align: center;
  background: linear-gradient(135deg, #050f1f 0%, #0a1e38 100%);
  color: #fff;
  font-family: -apple-system, "Segoe UI", "Helvetica Neue", Arial, sans-serif;
}
.err-code {
  font-size: clamp(96px, 18vw, 200px);
  font-weight: 800;
  margin: 0;
  letter-spacing: -.06em;
  background: linear-gradient(180deg, #fff, #cfe3ff 60%, #5ce0ff);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  filter: drop-shadow(0 0 24px rgba(92, 224, 255, .4));
}
.err-title { font-size: clamp(20px, 3vw, 28px); font-weight: 500; margin: 16px 0 8px; }
.err-desc { font-size: clamp(14px, 1.6vw, 16px); opacity: .7; margin: 0 0 28px; }
.err-home { text-decoration: none; }

/* IE 下重置部分新语法 */
@media all and (-ms-high-contrast: none), (-ms-high-contrast: active) {
  .subtitle, .stats, .lang-switch { display: block; text-align: center; }
  .lang-switch { width: max-content; margin-left: auto; margin-right: auto; }
  .lang-btn { display: inline-block; }
}