html,
  body {
    background: #fff;
    height: 100%

  }

  .fd,
  .fd * {
    box-sizing: border-box
  }

  body.fd {
    --accent: #765cd6;
    --accent-2: #5a8bff;
    --ink: #0b0c10;
    --muted: #3b3f4c;
    --border: rgba(0, 0, 0, .12);
    --chip: #f5f3ff;
    --code: #0e1116;
    --code-bg: #f7f7fb;
    --ease: cubic-bezier(.2, .8, .2, 1);
    --shadow-sm: 0 10px 28px rgba(0, 0, 0, .08);
    --shadow-md: 0 18px 46px rgba(0, 0, 0, .12);
    font-family: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, Arial, "Noto Sans", sans-serif;
    color: var(--ink);
    background: #fff;
    line-height: 1.7;
    overflow-x: hidden;
    min-height: 100%;
  }

 
  .fd-wrap {
    max-width: 1240px;
    margin: 0 auto;
    background: #fff;
    padding: clamp(24px, 6vw, 60px)
  }

  .fd-grid {
    display: grid;
    grid-template-columns: 300px 1fr;
    gap: clamp(22px, 4vw, 48px);
    align-items: start
  }

  @media (max-width: 1040px) {
    .fd-grid {
      grid-template-columns: 1fr
    }
  }

 
  .fd-title {
    font-weight: 200;
    font-size: clamp(30px, 6.5vw, 58px);
    letter-spacing: -.01em;
    margin: 0 0 .25em;
   color: #765cd6;
    -webkit-background-clip: text;
    background-clip: text;


  }

  @keyframes fdHue {
    0% {
      filter: hue-rotate(0)
    }

    100% {
      filter: hue-rotate(360deg)
    }
  }

  .fd-sub {
    color: var(--muted);
    margin: 0 0 1.2rem
  }

 
  .fd-toc {
    position: sticky;
    top: 16px;
    z-index: 5;
    border: 1px solid var(--border);
    border-radius: 16px;
    background: #fff;
    box-shadow: var(--shadow-sm);
    padding: 14px;
    overflow: hidden;
    will-change: transform, box-shadow;
    isolation: isolate;
    transition: box-shadow .6s var(--ease), transform .6s var(--ease), border-color .6s var(--ease), background .6s var(--ease);
  }

  .fd-toc:hover {
    transform: translateY(-2px);
    border-color: rgba(118, 92, 214, .35);
    box-shadow: var(--shadow-md)
  }

  .fd-toc h3 {
    margin: .2rem 0 .6rem;
    font-size: 13px;
    letter-spacing: .16em;
    color: #4a3ac1
  }

  .fd-toc ul {
    list-style: none;
    padding: 0;
    margin: 6px 0 0;
    position: relative
  }
  .fd-toc-indicator{
position:absolute; left:0; width:3px; border-radius:3px;
background:linear-gradient(180deg, #765cd6, #5a8bff);

transform:translateY(0);
transition: transform .5s cubic-bezier(.2,.8,.2,1), height .3s cubic-bezier(.2,.8,.2,1);
filter: drop-shadow(0 6px 10px rgba(118,92,214,.35));
}
  .fd-toc li {
    position: relative;
    padding: .6rem .6rem .6rem 2.25rem;
    border-radius: 10px;
    color: #2f3344;
    opacity: .92;
    cursor: pointer;
    transition: background .35s var(--ease), color .35s var(--ease), transform .35s var(--ease);
    outline: none;
  }

  .fd-toc li::before {
    content: "";
    position: absolute;
    left: .8rem;
    top: 50%;
    width: 8px;
    height: 8px;
    margin-top: -4px;
    border-radius: 50%;
    background: linear-gradient(180deg, #765cd6, #a899ff);
    box-shadow: 0 0 0 0 rgba(118, 92, 214, .0);
    transition: transform .35s var(--ease), box-shadow .35s var(--ease);
  }

  .fd-toc li.is-active {
    background: rgba(118, 92, 214, .06);
    color: #1b1f31;
    transform: translateX(2px)
  }

  .fd-toc li.is-active::before {
    transform: scale(1.25);
    box-shadow: 0 0 0 6px rgba(118, 92, 214, .12)
  }

 
  .fd-toc::after {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    height: 28px;
    top: var(--toc-y, -40px);
    background: linear-gradient(90deg, rgba(118, 92, 214, .0), rgba(118, 92, 214, .08), rgba(118, 92, 214, .0));
    pointer-events: none;
    filter: blur(6px);
    transition: top .18s var(--ease);
  }

 
  .fd-sec {
    position: relative;
    border: 1px solid var(--border);
    border-radius: 18px;
    background: #fff;
    box-shadow: var(--shadow-sm);
    padding: clamp(16px, 3vw, 24px);
    overflow: hidden;
    will-change: transform, box-shadow, border-color;
    transition: box-shadow .8s var(--ease), border-color .8s var(--ease), transform .8s var(--ease);
  }

  .fd-sec+.fd-sec {
    margin-top: clamp(18px, 3vw, 28px)
  }

  .fd-sec.is-hover {
    transform: translateY(-2px);
    border-color: rgba(118, 92, 214, .35);
    box-shadow: var(--shadow-md)
  }

  .fd-sec h2 {
    margin: .1rem 0 .65rem;
    font-size: clamp(20px, 3.3vw, 28px);
    font-weight: 200;
    letter-spacing: -.01em;
    position: relative;
    display: inline-block;
  }

  .fd-sec h2::after {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    bottom: -6px;
    height: 2px;
    border-radius: 2px;
    background: linear-gradient(90deg, #765cd6, #5a8bff, #765cd6);
    transform: scaleX(0);
    transform-origin: left;
    animation: fdUnder 1.2s var(--ease) forwards;
  }

  @keyframes fdUnder {
    to {
      transform: scaleX(1)
    }
  }

  .fd-sec h3 {
    margin: 1rem 0 .35rem;
    font-size: 18px;
    font-weight: 200
  }

  .fd-sec p {
    margin: .35rem 0;
    color: #2e3345
  }

  .fd-chip {
    display: inline-block;
    padding: .18rem .5rem;
    border-radius: 999px;
    background: var(--chip);
    color: #4a3ac1;
    font-weight: 600;
    font-size: 12px
  }

 
  .fd-code {
    position: relative;
    margin: .7rem 0;
    padding: 1rem 1rem;
    border-radius: 12px;
    border: 1px solid var(--border);
    background: var(--code-bg);
    color: var(--code);
    font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
    line-height: 1.55;
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, .7);
  }

  .fd-code pre {
    margin: 0;
    white-space: pre-wrap;
    word-break: break-word
  }

  .fd-code .cmt {
    color: #6a7385
  }

  .fd-code .kw {
    color: #7a4df4;
    font-weight: 600
  }

  .fd-code .str {
    color: #0f7a39
  }

  .fd-code .num {
    color: #b2461c
  }

 
  .fd-acc {
    border-top: 1px dashed rgba(0, 0, 0, .12);
    margin-top: .6rem;
    padding-top: .4rem
  }

  .fd-acc-item {
    border: 1px dashed rgba(0, 0, 0, .12);
    border-radius: 12px;
    margin: .55rem 0;
    overflow: hidden;
    background: #fff
  }

  .fd-acc-h {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: .75rem .9rem;
    cursor: pointer;
    user-select: none;
    transition: background .35s var(--ease)
  }

  .fd-acc-h b {
    font-weight: 100
  }

  .fd-acc-h:hover {
    background: rgba(118, 92, 214, .06)
  }

  .fd-acc-c {
    height: 0;
    overflow: hidden;
    transition: height .5s var(--ease)
  }

  .fd-acc-c>div {
    padding: .2rem .9rem .9rem
  }

  .fd-acc-arrow {
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: #f1edff;
    color: #4a3ac1;
    display: grid;
    place-items: center;
    transform: rotate(0deg);
    transition: transform .4s var(--ease)
  }

  .fd-acc-item.is-open .fd-acc-arrow {
    transform: rotate(180deg)
  }

 
  .fd-cl {
    margin: .4rem 0;
    padding: 0;
    list-style: none
  }

  .fd-cl li {
    padding: .55rem .65rem;
    border-radius: 10px;
    display: grid;
    grid-template-columns: 120px 1fr;
    gap: 16px;
    align-items: start;
    transition: transform .45s var(--ease);
  }

  .fd-cl li:nth-child(odd) {
    background: rgba(118, 92, 214, .04)
  }

  .fd-cl li:hover {
    transform: translateX(2px)
  }

  .fd-tag {
    font-weight: 700;
    color: #3a2bb0
  }

  .fd-date {
    font-weight: 600;
    color: #37405d
  }

 
  .fd-reveal {
    opacity: 0;
    transform: translateY(12px);
    transition: opacity .9s var(--ease), transform .9s var(--ease)
  }

  .fd-reveal.is-in {
    opacity: 1;
    transform: translateY(0)
  }

  .fd-stagger>* {
    opacity: 0;
    transform: translateY(8px)
  }

  .fd-stagger.is-in>* {
    animation: fdStg .8s var(--ease) forwards
  }

  .fd-stagger.is-in>*:nth-child(1) {
    animation-delay: .04s
  }

  .fd-stagger.is-in>*:nth-child(2) {
    animation-delay: .10s
  }

  .fd-stagger.is-in>*:nth-child(3) {
    animation-delay: .16s
  }

  .fd-stagger.is-in>*:nth-child(4) {
    animation-delay: .22s
  }

  @keyframes fdStg {
    to {
      opacity: 1;
      transform: translateY(0)
    }
  }

 
  .fd-bg {
    background: #fff;
    position: fixed;
    inset: 0;
    z-index: -1;
    pointer-events: none;
    overflow: hidden;
    contain: size layout paint style
  }

  .fd-canvas {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    display: block
  }

  .fd-blobs {
    position: absolute;
    inset: -20% -10% -10% -10%;
    filter: blur(28px);
    mix-blend-mode: multiply;
    opacity: .18;
    contain: paint
  }

  .fd-blob {
    position: absolute;
    border-radius: 50%;
    will-change: transform
  }

  .fd-blob--a {
    width: 40vmax;
    height: 40vmax;
    left: -10vmax;
    top: 0;
    background: radial-gradient(circle at 30% 30%, rgba(118, 92, 214, .6), rgba(118, 92, 214, 0) 60%);
    animation: fdBlobA 58s var(--ease) infinite alternate
  }

  .fd-blob--b {
    width: 36vmax;
    height: 36vmax;
    right: -12vmax;
    bottom: -4vmax;
    background: radial-gradient(circle at 70% 60%, rgba(86, 162, 255, .55), rgba(86, 162, 255, 0) 60%);
    animation: fdBlobB 66s var(--ease) infinite alternate
  }

  .fd-blob--c {
    width: 32vmax;
    height: 32vmax;
    left: 55%;
    top: -8vmax;
    background: radial-gradient(circle at 40% 50%, rgba(118, 92, 214, .5), rgba(118, 92, 214, 0) 60%);
    animation: fdBlobC 74s var(--ease) infinite alternate
  }

  @keyframes fdBlobA {
    to {
      transform: translate3d(6vmax, 3vmax, 0) scale(1.06)
    }
  }

  @keyframes fdBlobB {
    to {
      transform: translate3d(-5vmax, -4vmax, 0) scale(1.05)
    }
  }

  @keyframes fdBlobC {
    to {
      transform: translate3d(-4vmax, 4vmax, 0) scale(1.05)
    }
  }

 
  @media (prefers-reduced-motion: reduce) {

    .fd-canvas,
    .fd-blobs {
      display: none !important
    }
  }