/* ============================================================
   百晓生 · 宇宙星空主题
   配色（深空蓝紫 + 星青 + 星光金）/ 字体 / 卡片 / 星空背景 / 动效
   ============================================================ */

:root {
  --md-text-font: "Noto Sans SC", "PingFang SC", "Microsoft YaHei",
    "Hiragino Sans GB", system-ui, -apple-system, sans-serif;
  --md-code-font: "JetBrains Mono", "Cascadia Code", "SFMono-Regular",
    Consolas, "Liberation Mono", monospace;
  --bx-serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "SimSun",
    "STSong", Georgia, serif;
}

/* ---------- 浅色：白昼星云 ---------- */
[data-md-color-scheme="default"] {
  --md-primary-fg-color: #16233f;
  --md-primary-fg-color--light: #2b3d63;
  --md-primary-fg-color--dark: #0e1830;
  --md-primary-bg-color: #eaf1ff;
  --md-primary-bg-color--light: #b9c8e8;
  --md-accent-fg-color: #3b6ef0;
  --md-accent-fg-color--transparent: rgba(59, 110, 240, .12);
  --md-default-bg-color: #eef3ff;
  --md-default-fg-color: #101a33;
  --md-default-fg-color--light: #5b6b8c;
  --md-default-fg-color--lighter: #93a0bd;
  --md-typeset-a-color: #2f5fe0;
  --md-code-bg-color: #e3ebfb;
  --bx-space-bg: #e9f0ff;
  --bx-star: rgba(59, 110, 240, .3);
  --bx-accent: #3b6ef0;
  --bx-accent-2: #7c5cff;
  --bx-accent-3: #e0a020;
  --bx-glow: rgba(76, 123, 255, .35);
  --bx-ink-strong: #0d1730;
  --bx-card-bg: #ffffff;
  --bx-border: rgba(38, 58, 110, .14);
  --bx-hairline: rgba(38, 58, 110, .09);
  --bx-wash: rgba(76, 123, 255, .06);
  --bx-shadow: 0 1px 2px rgba(30, 45, 90, .06), 0 6px 18px rgba(30, 45, 90, .06);
  --bx-shadow-hover: 0 6px 18px rgba(45, 75, 170, .16), 0 16px 40px rgba(45, 75, 170, .12);
  --bx-hero-grad: linear-gradient(100deg, #101a33 0%, #2f5fe0 40%, #7c5cff 64%, #101a33 100%);
}

/* ---------- 深色：深空 ---------- */
[data-md-color-scheme="slate"] {
  --md-primary-fg-color: #0a1122;
  --md-primary-fg-color--light: #16204a;
  --md-primary-fg-color--dark: #05080f;
  --md-primary-bg-color: #e6eeff;
  --md-primary-bg-color--light: #9fb0d8;
  --md-accent-fg-color: #6ea8ff;
  --md-accent-fg-color--transparent: rgba(110, 168, 255, .14);
  --md-default-bg-color: #070b18;
  --md-default-fg-color: #e6ecff;
  --md-default-fg-color--light: #b6c2de;
  --md-default-fg-color--lighter: #8e9cbe;
  --md-typeset-a-color: #7fb2ff;
  --md-code-bg-color: #0e1428;
  --bx-space-bg: #05080f;
  --bx-star: rgba(255, 255, 255, .8);
  --bx-accent: #6ea8ff;
  --bx-accent-2: #a78bfa;
  --bx-accent-3: #ffd166;
  --bx-glow: rgba(110, 168, 255, .4);
  --bx-ink-strong: #f0f5ff;
  --bx-card-bg: rgba(18, 28, 56, .72);
  --bx-border: rgba(140, 170, 255, .16);
  --bx-hairline: rgba(140, 170, 255, .1);
  --bx-wash: rgba(110, 168, 255, .08);
  --bx-shadow: 0 1px 2px rgba(0, 0, 0, .5), 0 8px 24px rgba(0, 0, 0, .45);
  --bx-shadow-hover: 0 8px 24px rgba(40, 70, 180, .35), 0 20px 48px rgba(0, 0, 0, .55);
  --bx-hero-grad: linear-gradient(100deg, #eaf1ff 0%, #6ea8ff 38%, #a78bfa 64%, #eaf1ff 100%);
}

/* ============================================================
   星空背景：星点闪烁 + 星云漂移（底色交给 html，body 透明）
   ============================================================ */
/* data-md-color-scheme 挂在 <body>（不在 html），html 取不到这些变量 —— 底色必须设在 body */
body {
  background-color: var(--bx-space-bg) !important;
  min-height: 100vh;
}
/* 中间层保持透明，否则会盖住 body 上的星空 */
.md-container,
.md-main,
.md-content {
  background-color: transparent !important;
}
@media screen and (min-width: 76.25em) {
  .md-sidebar {
    background-color: transparent !important;
  }
}
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background-image:
    radial-gradient(1px 1px at 24px 36px, var(--bx-star), transparent),
    radial-gradient(1px 1px at 132px 92px, var(--bx-star), transparent),
    radial-gradient(1.4px 1.4px at 208px 48px, var(--bx-star), transparent),
    radial-gradient(1px 1px at 84px 172px, var(--bx-star), transparent),
    radial-gradient(1px 1px at 268px 208px, var(--bx-star), transparent),
    radial-gradient(1.2px 1.2px at 176px 248px, var(--bx-star), transparent);
  background-size: 300px 300px;
  background-repeat: repeat;
  animation: bx-twinkle 7s ease-in-out infinite;
}
body::after {
  content: "";
  position: fixed;
  inset: -12%;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(58% 46% at 14% 8%, rgba(90, 120, 255, .22), transparent 70%),
    radial-gradient(52% 42% at 86% 22%, rgba(150, 90, 255, .2), transparent 70%),
    radial-gradient(46% 46% at 52% 88%, rgba(30, 180, 220, .16), transparent 70%);
  animation: bx-drift 28s ease-in-out infinite alternate;
}
body[data-md-color-scheme="default"]::after {
  background:
    radial-gradient(58% 46% at 14% 8%, rgba(90, 120, 255, .12), transparent 70%),
    radial-gradient(52% 42% at 86% 22%, rgba(150, 90, 255, .1), transparent 70%),
    radial-gradient(46% 46% at 52% 88%, rgba(30, 180, 220, .1), transparent 70%);
}

/* 顶部阅读进度条（滚动驱动动画，支持者生效） */
html::after {
  content: "";
  position: fixed;
  top: 0;
  left: 0;
  z-index: 1000;
  width: 100%;
  height: 3px;
  pointer-events: none;
  background: linear-gradient(90deg, #4b7bff, #a78bfa, #22d3ee, #4b7bff);
  transform: scaleX(0);
  transform-origin: 0 50%;
  animation: bx-progress linear both;
  animation-timeline: scroll(root);
}

/* ============================================================
   顶栏与标签
   ============================================================ */
.md-header {
  box-shadow: 0 2px 18px rgba(0, 0, 0, .35);
}
.md-tabs {
  border-bottom: 1px solid var(--bx-hairline);
}
.md-tabs__link {
  font-family: var(--bx-serif);
  letter-spacing: .05em;
}

/* ============================================================
   排版
   ============================================================ */
.md-typeset {
  line-height: 1.85;
}
.md-typeset h1,
.md-typeset h2,
.md-typeset h3,
.md-typeset h4 {
  font-family: var(--bx-serif);
  font-weight: 600;
  letter-spacing: .01em;
}
.md-typeset h1 {
  color: var(--bx-ink-strong);
}
.md-typeset h2 {
  padding-bottom: .3em;
  border-bottom: 1px solid var(--bx-hairline);
}
.md-typeset a {
  text-decoration: none;
}
.md-typeset table:not([class]) {
  overflow: hidden;
  border: 1px solid var(--bx-border);
  border-radius: 10px;
  box-shadow: none;
}
.md-typeset table:not([class]) thead {
  background: var(--bx-wash);
}
.md-typeset table:not([class]) th {
  font-family: var(--bx-serif);
  font-weight: 600;
}
.md-typeset blockquote {
  border-left: 3px solid var(--bx-accent);
  background: var(--bx-wash);
  border-radius: 0 8px 8px 0;
  color: var(--md-default-fg-color--light);
}
.md-typeset pre > code {
  border-radius: 10px;
}

/* ============================================================
   首页组件
   ============================================================ */
.bx-hero {
  margin: .2rem 0 1.6rem;
  padding: 1.9rem 1.6rem 1.7rem;
  border: 1px solid var(--bx-border);
  border-radius: 18px;
  background:
    radial-gradient(120% 150% at 8% -10%, rgba(76, 123, 255, .22), transparent 55%),
    radial-gradient(100% 130% at 100% 0%, rgba(150, 90, 255, .2), transparent 60%),
    var(--bx-card-bg);
  box-shadow: var(--bx-shadow);
  backdrop-filter: blur(6px);
}
.bx-hero__title {
  font-family: var(--bx-serif);
  font-size: 2.1rem;
  font-weight: 700;
  line-height: 1.2;
  color: var(--bx-ink-strong);
  letter-spacing: .08em;
}
.bx-hero__sub {
  margin-top: .4rem;
  font-size: .92rem;
  color: var(--md-default-fg-color--light);
  letter-spacing: .02em;
}
.bx-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .6rem;
  margin-top: 1.2rem;
}
.bx-btn {
  display: inline-block;
  padding: .5rem 1.2rem;
  border: 1px solid var(--bx-border);
  border-radius: 999px;
  background: var(--bx-card-bg);
  color: var(--md-default-fg-color) !important;
  font-size: .8rem;
  font-family: var(--bx-serif);
  letter-spacing: .06em;
  border-bottom: 1px solid var(--bx-border) !important;
  transition: transform .15s, box-shadow .15s, background .15s, border-color .15s;
}
.bx-btn:hover {
  transform: translateY(-1px);
  box-shadow: var(--bx-shadow);
  border-color: var(--bx-accent) !important;
  color: var(--bx-accent) !important;
}
.bx-btn--primary {
  background: linear-gradient(135deg, #4b7bff, #8b5cf6);
  border-color: transparent !important;
  color: #fff !important;
  box-shadow: 0 6px 20px rgba(76, 123, 255, .35);
}
.bx-btn--primary:hover {
  color: #fff !important;
  box-shadow: 0 10px 28px rgba(76, 123, 255, .5);
}

.bx-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(14rem, 1fr));
  gap: .8rem;
  margin: 1rem 0 1.6rem;
}
.bx-card {
  display: flex;
  align-items: center;
  gap: .8rem;
  padding: .85rem .95rem;
  border: 1px solid var(--bx-border);
  border-radius: 12px;
  background: var(--bx-card-bg);
  color: var(--md-default-fg-color) !important;
  border-bottom: 1px solid var(--bx-border) !important;
  box-shadow: var(--bx-shadow);
  backdrop-filter: blur(4px);
}
.bx-card__badge {
  flex: 0 0 auto;
  width: 2.2rem;
  height: 2.2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 9px;
  background: linear-gradient(135deg, #4b7bff, #8b5cf6);
  color: #fff;
  font-family: var(--bx-serif);
  font-size: 1.05rem;
  line-height: 1;
}
.bx-card__body {
  min-width: 0;
}
.bx-card__name {
  display: block;
  font-family: var(--bx-serif);
  font-size: .92rem;
  font-weight: 600;
  color: var(--bx-ink-strong);
}
.bx-card__meta {
  display: block;
  margin-top: .1rem;
  font-size: .7rem;
  color: var(--md-default-fg-color--light);
}

.bx-stats {
  display: flex;
  flex-wrap: wrap;
  gap: .8rem;
  margin: 1rem 0 1.6rem;
}
.bx-stat {
  flex: 1 1 8rem;
  padding: .9rem .6rem;
  text-align: center;
  border: 1px solid var(--bx-border);
  border-radius: 12px;
  background: var(--bx-card-bg);
  box-shadow: var(--bx-shadow);
  backdrop-filter: blur(4px);
}
.bx-stat b {
  display: block;
  font-family: var(--bx-serif);
  font-size: 1.6rem;
  line-height: 1.2;
  background: linear-gradient(120deg, var(--bx-accent), var(--bx-accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.bx-stat span {
  font-size: .72rem;
  color: var(--md-default-fg-color--light);
  letter-spacing: .08em;
}

.bx-recent {
  margin: .6rem 0 0;
  padding: 0;
  list-style: none;
}
.bx-recent li {
  display: flex;
  gap: 1rem;
  align-items: baseline;
  justify-content: space-between;
  padding: .4rem 0;
  border-bottom: 1px dashed var(--bx-hairline);
}
.bx-recent li:last-child {
  border-bottom: none;
}
.bx-recent a {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.bx-recent time {
  flex: 0 0 auto;
  font-size: .72rem;
  color: var(--md-default-fg-color--light);
}

/* ============================================================
   问答页
   ============================================================ */
.qa-app {
  margin: 1.2rem 0;
}
.qa-examples {
  display: flex;
  flex-wrap: wrap;
  gap: .45rem;
  margin: .2rem 0 .9rem;
}
.qa-chip {
  padding: .28rem .7rem;
  border: 1px solid var(--bx-border);
  border-radius: 999px;
  background: var(--bx-card-bg);
  color: var(--md-default-fg-color--light);
  font-size: .72rem;
  cursor: pointer;
}
.qa-chip:hover {
  color: var(--bx-accent);
  border-color: var(--bx-accent);
  background: var(--bx-wash);
}
.qa-compose {
  display: flex;
  gap: .6rem;
  align-items: stretch;
}
#qa-input {
  flex: 1;
  min-height: 3.6rem;
  padding: .7rem .9rem;
  border: 1px solid var(--bx-border);
  border-radius: 12px;
  background: var(--bx-card-bg);
  color: var(--md-default-fg-color);
  font-family: inherit;
  font-size: .82rem;
  line-height: 1.6;
  resize: vertical;
  transition: border-color .15s, box-shadow .15s;
}
#qa-input:focus {
  outline: none;
  border-color: var(--bx-accent);
  box-shadow: 0 0 0 3px var(--md-accent-fg-color--transparent), 0 0 24px var(--bx-glow);
}
.qa-send {
  flex: 0 0 auto;
  padding: 0 1.4rem;
  border: none;
  border-radius: 12px;
  background: linear-gradient(135deg, #4b7bff, #8b5cf6);
  color: #fff;
  font-family: var(--bx-serif);
  font-size: .85rem;
  letter-spacing: .08em;
  cursor: pointer;
  box-shadow: 0 6px 20px rgba(76, 123, 255, .3);
}
.qa-send:hover {
  transform: translateY(-1px);
}
.qa-send:disabled {
  opacity: .55;
  cursor: not-allowed;
  transform: none;
}
.qa-hint {
  margin-top: .4rem;
  font-size: .68rem;
  color: var(--md-default-fg-color--lighter);
}
.qa-thread {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-top: 1.4rem;
}
.qa-msg {
  display: flex;
  gap: .6rem;
}
.qa-msg--user {
  justify-content: flex-end;
}
.qa-bubble {
  max-width: 86%;
  padding: .7rem 1rem;
  border-radius: 14px;
  font-size: .82rem;
  line-height: 1.8;
  overflow-wrap: break-word;
}
.qa-msg--user .qa-bubble {
  background: linear-gradient(135deg, #4b7bff, #7c3aed);
  color: #fff;
  border-bottom-right-radius: 4px;
  box-shadow: 0 6px 20px rgba(76, 123, 255, .32);
}
.qa-msg--bot .qa-bubble {
  background: var(--bx-card-bg);
  border: 1px solid var(--bx-border);
  border-bottom-left-radius: 4px;
  box-shadow: var(--bx-shadow);
}
.qa-bubble .md-typeset table:not([class]) {
  font-size: .72rem;
}
.qa-cursor::after {
  content: "▍";
  margin-left: 2px;
  color: var(--bx-accent);
  animation: bx-blink 1.1s steps(2, start) infinite;
}
.qa-sources {
  margin-top: .7rem;
}
.qa-sources__title {
  font-family: var(--bx-serif);
  font-size: .74rem;
  color: var(--md-default-fg-color--light);
  letter-spacing: .1em;
}
.qa-source {
  display: block;
  margin: .35rem 0;
  padding: .5rem .75rem;
  border-left: 3px solid var(--bx-accent);
  border-radius: 6px;
  background: var(--bx-wash);
  font-size: .74rem;
  color: var(--md-default-fg-color) !important;
  border-bottom: none !important;
  transition: background .15s;
}
.qa-source:hover {
  background: var(--md-accent-fg-color--transparent);
}
.qa-source b {
  color: var(--bx-accent);
  font-weight: 600;
}

/* 问答反馈按钮 */
.qa-feedback {
  display: none;
  gap: .4rem;
  margin-top: .55rem;
}
.qa-feedback.is-ready {
  display: flex;
}
.qa-feedback button {
  padding: .2rem .7rem;
  border: 1px solid var(--bx-border);
  border-radius: 999px;
  background: transparent;
  color: var(--md-default-fg-color--light);
  font-size: .68rem;
  cursor: pointer;
  transition: color .18s, border-color .18s, background .18s;
}
.qa-feedback button:hover {
  color: var(--bx-accent);
  border-color: var(--bx-accent);
  background: var(--bx-wash);
}
.qa-feedback__done {
  font-size: .68rem;
  color: var(--md-default-fg-color--light);
}

/* ============================================================
   上传页
   ============================================================ */
.up-app {
  margin: 1.2rem 0;
}
.up-auth {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  align-items: center;
  margin-bottom: .8rem;
}
.up-auth input {
  padding: .45rem .8rem;
  border: 1px solid var(--bx-border);
  border-radius: 10px;
  background: var(--bx-card-bg);
  color: var(--md-default-fg-color);
  font-family: inherit;
  font-size: .78rem;
  transition: border-color .15s, box-shadow .15s;
}
.up-auth input:focus {
  outline: none;
  border-color: var(--bx-accent);
  box-shadow: 0 0 0 3px var(--md-accent-fg-color--transparent);
}
#up-auth-state {
  font-size: .7rem;
  color: var(--md-default-fg-color--light);
}
.up-drop {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: .35rem;
  padding: 1.6rem 1rem;
  border: 1.5px dashed var(--bx-border);
  border-radius: 14px;
  background: var(--bx-card-bg);
  cursor: pointer;
  transition: border-color .2s, background .2s, transform .2s;
}
.up-drop:hover,
.up-drop.is-over {
  border-color: var(--bx-accent);
  background: var(--bx-wash);
  transform: translateY(-1px);
}
.up-drop input[type="file"] {
  display: none;
}
.up-drop__icon {
  font-size: 1.4rem;
  line-height: 1;
  color: var(--bx-accent);
}
.up-drop__text {
  font-size: .76rem;
  color: var(--md-default-fg-color--light);
}
.up-drop__file {
  font-size: .74rem;
  color: var(--bx-accent);
}
.up-actions {
  display: flex;
  gap: .7rem;
  align-items: center;
  margin-top: .8rem;
}
.up-status {
  font-size: .74rem;
  color: var(--md-default-fg-color--light);
}
.up-log {
  margin-top: .9rem;
}
.up-log__item {
  padding: .4rem .7rem;
  border-left: 3px solid var(--bx-border);
  border-radius: 6px;
  background: var(--bx-wash);
  font-size: .74rem;
  margin-bottom: .35rem;
  animation: bx-in .3s cubic-bezier(.22, .61, .36, 1) backwards;
}
.up-log__item.is-ok {
  border-left-color: var(--bx-accent);
}
.up-log__item.is-bad {
  border-left-color: #e06a5a;
}

/* 指标页 */
.mx-range {
  display: flex;
  gap: .4rem;
  margin: .6rem 0 1rem;
}
.mx-range button {
  padding: .28rem .9rem;
  border: 1px solid var(--bx-border);
  border-radius: 999px;
  background: var(--bx-card-bg);
  color: var(--md-default-fg-color--light);
  font-size: .72rem;
  cursor: pointer;
  transition: color .18s, border-color .18s, background .18s;
}
.mx-range button:hover {
  color: var(--bx-accent);
  border-color: var(--bx-accent);
}
.mx-range button.is-active {
  background: linear-gradient(135deg, #4b7bff, #8b5cf6);
  border-color: transparent;
  color: #fff;
}

/* ============================================================
   页脚
   ============================================================ */
.md-footer-meta {
  background: rgba(5, 8, 15, .85);
}
.md-footer-meta__inner {
  font-size: .7rem;
  letter-spacing: .04em;
}

/* ============================================================
   关键帧
   ============================================================ */
@keyframes bx-twinkle {
  0%, 100% { opacity: .5; }
  50%      { opacity: 1; }
}
@keyframes bx-drift {
  from { transform: translate3d(0, 0, 0) scale(1); }
  to   { transform: translate3d(-2.5%, 2%, 0) scale(1.08); }
}
@keyframes bx-progress {
  to { transform: scaleX(1); }
}
@keyframes bx-blink {
  50% { opacity: 0; }
}
@keyframes bx-in {
  from { opacity: 0; transform: translateY(12px); }
  to   { opacity: 1; transform: none; }
}
@keyframes bx-in-right {
  from { opacity: 0; transform: translateX(16px); }
  to   { opacity: 1; transform: none; }
}
@keyframes bx-in-left {
  from { opacity: 0; transform: translateX(-16px); }
  to   { opacity: 1; transform: none; }
}
@keyframes bx-float {
  0%, 100% { transform: translate(0, 0) scale(1); }
  50%      { transform: translate(-24px, 18px) scale(1.15); }
}
@keyframes bx-shine {
  0%, 100% { background-position: 0% 50%; }
  50%      { background-position: 100% 50%; }
}
@keyframes bx-meteor {
  0%   { opacity: 0; transform: rotate(32deg) translateX(-12vw); }
  8%   { opacity: 1; }
  62%  { opacity: 1; }
  100% { opacity: 0; transform: rotate(32deg) translateX(72vw); }
}
@keyframes bx-orbit {
  from { transform: rotate(0deg); }
  to   { transform: rotate(360deg); }
}

/* ============================================================
   动效层
   ============================================================ */

/* ---------- 流星（由 extra.js 注入若干颗） ---------- */
.bx-meteor-field {
  position: fixed;
  inset: 0;
  z-index: -1;
  overflow: hidden;
  pointer-events: none;
}
.bx-meteor {
  position: absolute;
  width: 150px;
  height: 2px;
  border-radius: 2px;
  opacity: 0;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, .95));
  filter: drop-shadow(0 0 6px rgba(140, 180, 255, .9));
  animation-name: bx-meteor;
  animation-timing-function: linear;
  animation-iteration-count: infinite;
}

/* ---------- 正文入场 ---------- */
.md-content__inner > *:nth-child(-n+6) {
  animation: bx-in .45s cubic-bezier(.22, .61, .36, 1) backwards;
}
.md-content__inner > *:nth-child(2) { animation-delay: .05s; }
.md-content__inner > *:nth-child(3) { animation-delay: .1s; }
.md-content__inner > *:nth-child(4) { animation-delay: .15s; }
.md-content__inner > *:nth-child(5) { animation-delay: .2s; }
.md-content__inner > *:nth-child(6) { animation-delay: .25s; }

/* ---------- 二级标题前星芒装饰 ---------- */
.md-typeset h2::before {
  content: "";
  display: inline-block;
  width: .36em;
  height: .36em;
  margin-right: .5em;
  vertical-align: middle;
  border-radius: 3px;
  background: linear-gradient(135deg, var(--bx-accent), var(--bx-accent-2));
  box-shadow: 0 0 8px var(--bx-glow);
  transform: rotate(45deg);
  transition: transform .45s cubic-bezier(.34, 1.56, .64, 1);
}
.md-typeset h2:hover::before {
  transform: rotate(135deg) scale(1.2);
}

/* ---------- 正文链接：下划线滑出 ---------- */
.md-typeset a:not(.bx-card):not(.bx-btn):not(.qa-source):not(.md-button) {
  border-bottom: none;
  background-image: linear-gradient(90deg, var(--bx-accent), var(--bx-accent-2));
  background-repeat: no-repeat;
  background-position: 0 100%;
  background-size: 0% 1px;
  transition: background-size .28s cubic-bezier(.22, .61, .36, 1), color .2s;
}
.md-typeset a:not(.bx-card):not(.bx-btn):not(.qa-source):not(.md-button):hover {
  background-size: 100% 1px;
  border-bottom: none;
}

/* ---------- 顶栏与标签 ---------- */
.md-header__title {
  font-family: var(--bx-serif);
  letter-spacing: .1em;
}
.md-header__button.md-logo svg {
  transition: transform .4s cubic-bezier(.34, 1.56, .64, 1), filter .4s;
}
.md-header__button.md-logo:hover svg {
  transform: rotate(-8deg) scale(1.12);
  filter: drop-shadow(0 0 8px var(--bx-glow));
}
.md-tabs__link {
  position: relative;
}
.md-tabs__link::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: .1rem;
  width: 0;
  height: 2px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--bx-accent), var(--bx-accent-2));
  box-shadow: 0 0 8px var(--bx-glow);
  transform: translateX(-50%);
  transition: width .28s cubic-bezier(.22, .61, .36, 1);
}
.md-tabs__link:hover::after,
.md-tabs__item--active .md-tabs__link::after {
  width: 1.6rem;
}

/* ---------- 侧栏导航 ---------- */
.md-nav__link {
  transition: color .18s, transform .18s;
}
.md-nav__link:hover {
  color: var(--bx-accent) !important;
  transform: translateX(3px);
}

/* ---------- hero ---------- */
.bx-hero {
  position: relative;
  overflow: hidden;
}
.bx-hero::before,
.bx-hero::after {
  content: "";
  position: absolute;
  border-radius: 50%;
  pointer-events: none;
  filter: blur(28px);
}
.bx-hero::before {
  top: -70px;
  right: -50px;
  width: 210px;
  height: 210px;
  background: radial-gradient(circle, rgba(76, 123, 255, .55), transparent 70%);
  animation: bx-float 15s ease-in-out infinite;
}
.bx-hero::after {
  bottom: -80px;
  left: 12%;
  width: 170px;
  height: 170px;
  background: radial-gradient(circle, rgba(167, 139, 250, .45), transparent 70%);
  animation: bx-float 19s ease-in-out infinite reverse;
}
@supports ((-webkit-background-clip: text) or (background-clip: text)) {
  .bx-hero__title {
    background: var(--bx-hero-grad);
    background-size: 220% auto;
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    animation: bx-shine 9s ease-in-out infinite;
  }
}
.bx-hero__actions {
  animation: bx-in .5s .12s cubic-bezier(.22, .61, .36, 1) backwards;
}

/* ---------- 首屏星轨：环绕光晕 ---------- */
.bx-orbit {
  position: absolute;
  top: 50%;
  right: 5%;
  width: 220px;
  height: 220px;
  margin-top: -110px;
  transform: rotate(-16deg);
  pointer-events: none;
}
.bx-orbit__halo {
  position: absolute;
  inset: -34px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(76, 123, 255, .28), rgba(167, 139, 250, .12) 55%, transparent 70%);
  filter: blur(16px);
  animation: bx-breathe 7s ease-in-out infinite;
}
.bx-orbit__ring,
.bx-orbit__spinner {
  position: absolute;
  inset: 0;
}
.bx-orbit__ring {
  border: 2px solid transparent;
  border-top-color: rgba(160, 200, 255, .95);
  border-right-color: rgba(160, 200, 255, .28);
  border-radius: 50%;
  animation: bx-spin 5.5s linear infinite;
}
.bx-orbit__ring--2 {
  inset: 26px;
  border-top-color: rgba(200, 180, 255, .9);
  border-right-color: rgba(200, 180, 255, .22);
  animation-duration: 3.8s;
  animation-direction: reverse;
}
.bx-orbit__spinner {
  animation: bx-spin 7s linear infinite;
}
.bx-orbit__spinner--2 {
  animation-duration: 4.6s;
  animation-direction: reverse;
}
.bx-orbit__star {
  position: absolute;
  top: -4px;
  left: 50%;
  width: 8px;
  height: 8px;
  margin-left: -4px;
  border-radius: 50%;
  background: #dbe9ff;
  box-shadow: 0 0 12px 3px rgba(140, 190, 255, .85);
}
.bx-orbit__spinner--2 .bx-orbit__star {
  width: 6px;
  height: 6px;
  margin-left: -3px;
  background: #ece4ff;
  box-shadow: 0 0 10px 3px rgba(167, 139, 250, .85);
}
@keyframes bx-spin {
  to { transform: rotate(360deg); }
}
@keyframes bx-breathe {
  0%, 100% { opacity: .55; transform: scale(.96); }
  50%      { opacity: 1; transform: scale(1.06); }
}

/* ---------- 首页卡片 ---------- */
.bx-grid {
  perspective: 900px;
}
.bx-card {
  position: relative;
  overflow: hidden;
  transform-style: preserve-3d;
  animation: bx-in .5s cubic-bezier(.22, .61, .36, 1) backwards;
  animation-delay: calc(var(--i, 0) * 45ms);
  transition: transform .25s cubic-bezier(.22, .61, .36, 1), box-shadow .25s, border-color .25s;
}
.bx-card::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  pointer-events: none;
  opacity: 0;
  background: radial-gradient(220px circle at var(--mx, 50%) var(--my, 50%), var(--bx-glow), transparent 62%);
  transition: opacity .25s;
}
.bx-card:hover::before {
  opacity: 1;
}
.bx-card::after {
  content: "";
  position: absolute;
  top: -20%;
  bottom: -20%;
  left: -70%;
  width: 55%;
  pointer-events: none;
  background: linear-gradient(100deg, transparent, rgba(255, 255, 255, .35), transparent);
  transform: skewX(-18deg);
  transition: left .6s cubic-bezier(.22, .61, .36, 1);
}
[data-md-color-scheme="slate"] .bx-card::after {
  background: linear-gradient(100deg, transparent, rgba(200, 220, 255, .16), transparent);
}
.bx-card:hover::after {
  left: 120%;
}
.bx-card:hover {
  transform: translateY(-2px);
  border-color: var(--bx-accent) !important;
  box-shadow: var(--bx-shadow-hover);
}
.bx-card__badge {
  transition: transform .35s cubic-bezier(.34, 1.56, .64, 1), box-shadow .35s;
}
.bx-card:hover .bx-card__badge {
  transform: rotate(-8deg) scale(1.12);
  box-shadow: 0 0 16px var(--bx-glow);
}

/* ---------- 首页统计 ---------- */
.bx-stat {
  animation: bx-in .5s cubic-bezier(.22, .61, .36, 1) backwards;
  animation-delay: calc(240ms + var(--i, 0) * 70ms);
  transition: transform .25s, box-shadow .25s, border-color .25s;
}
.bx-stat:hover {
  transform: translateY(-5px);
  border-color: var(--bx-accent);
  box-shadow: var(--bx-shadow-hover);
}
.bx-stat b {
  font-variant-numeric: tabular-nums;
}

/* ---------- 最近更新 ---------- */
.bx-recent li {
  position: relative;
  animation: bx-in .45s cubic-bezier(.22, .61, .36, 1) backwards;
  animation-delay: calc(320ms + var(--i, 0) * 45ms);
  transition: transform .2s;
}
.bx-recent li::before {
  content: "";
  position: absolute;
  left: -11px;
  top: 20%;
  bottom: 20%;
  width: 3px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--bx-accent), var(--bx-accent-2));
  box-shadow: 0 0 8px var(--bx-glow);
  transform: scaleY(0);
  transition: transform .22s;
}
.bx-recent li:hover {
  transform: translateX(7px);
}
.bx-recent li:hover::before {
  transform: scaleY(1);
}

/* ---------- 问答页 ---------- */
.qa-msg {
  animation: bx-in .38s cubic-bezier(.22, .61, .36, 1) backwards;
}
.qa-msg--user {
  animation-name: bx-in-right;
}
.qa-msg--bot {
  animation-name: bx-in-left;
}
.qa-source {
  position: relative;
  animation: bx-in .38s cubic-bezier(.22, .61, .36, 1) backwards;
  animation-delay: calc(60ms + var(--i, 0) * 55ms);
}
.qa-send {
  position: relative;
  overflow: hidden;
}
.qa-send::after {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  width: 100%;
  pointer-events: none;
  background: linear-gradient(115deg, transparent 34%, rgba(255, 255, 255, .45) 50%, transparent 66%);
  transform: translateX(-130%);
  transition: transform .65s ease;
}
.qa-send:hover::after {
  transform: translateX(130%);
}
.qa-chip {
  transition: transform .2s, color .2s, border-color .2s, background .2s;
}
.qa-chip:hover {
  transform: translateY(-2px) scale(1.03);
}

/* ---------- 表格与回到顶部 ---------- */
.md-typeset table:not([class]) tbody tr {
  transition: background .16s;
}
.md-typeset table:not([class]) tbody tr:hover {
  background: var(--bx-wash);
}
.md-top {
  transition: transform .25s, background .25s;
}
.md-top:hover {
  transform: translateY(-4px);
}

/* ============================================================
   响应式
   ============================================================ */
@media screen and (max-width: 60em) {
  .bx-orbit {
    display: none;
  }
}

@media screen and (max-width: 44.9375em) {
  .bx-hero {
    padding: 1.3rem 1.1rem;
  }
  .bx-hero__title {
    font-size: 1.7rem;
  }
  .qa-compose {
    flex-direction: column;
  }
  .qa-send {
    padding: .6rem 1rem;
  }
  .qa-bubble {
    max-width: 100%;
  }
}

/* ---------- 尊重系统「减弱动效」设置 ---------- */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }
  .bx-meteor-field {
    display: none;
  }
}