:root{
    --bg:#FFFFFF;
    --bg-tint:#F6F2FC;
    --surface:#FFFFFF;
    --ink:#100F16;
    --ink-soft:#3B3746;
    --muted:#818181;
    --faint:#A8A2BA;
    --border:#E1DEEC;
    --border-soft:#EFEBFA;

    --indigo:#322996;
    --indigo-deep:#271F78;
    --indigo-pale:#ECEBFA;
    --violet:#4B31D1;
    --violet-pale:#F2EFFC;
    --red:#D4384F;
    --red-2:#B13771;
    --red-pale:#FCEDEF;
    --red-orig:#E91547;
    --logo-red:#FC1414;
    --logo-gold:#9C843C;

    --grad:linear-gradient(90deg,var(--violet),var(--red));
    --grad-135:linear-gradient(135deg,var(--violet),var(--red));

    --mandatory:#D4384F;   --mandatory-bg:#FCEDEF;
    --optional:#5F5B70;    --optional-bg:#F1F0F5;

    /* light code theme, on-brand */
    --code-bg:#F7F4FC;
    --code-border:#E6E1F2;
    --code-tabbar:#EFEAFA;
    --code-ink:#3A3550;
    --code-key:#322996;
    --code-str:#B1355F;
    --code-num:#4B31D1;
    --code-punc:#948EAF;
    --code-com:#ABA5C0;
    --code-verb:#D4384F;
    --code-flag:#7C7791;

    --radius:16px;
    --radius-sm:12px;
    --maxw:1300px;
    --sidebar-w:270px;
    --toc-w:236px;
    --header-h:66px;

    --disp:'Inter',system-ui,sans-serif;
    --body:'Inter',system-ui,sans-serif;
    --ui:'DM Sans','Inter',sans-serif;
    --mono:'JetBrains Mono',ui-monospace,monospace;
  }

  *{box-sizing:border-box;}
  html{scroll-behavior:smooth;}
  body{
    margin:0; background:var(--bg); color:var(--ink);
    font-family:var(--body); font-size:15.5px; line-height:1.6;
    -webkit-font-smoothing:antialiased;
  }
  h1,h2,h3,h4{font-family:var(--disp); color:var(--ink); line-height:1.18; margin:0; font-weight:700; letter-spacing:-0.01em;}
  a{color:inherit; text-decoration:none;}
  p{color:var(--ink-soft); margin:0 0 14px;}
  code{font-family:var(--mono);}
  ::selection{background:#E3DEF9;}
  a:focus-visible,button:focus-visible{outline:2px solid var(--indigo); outline-offset:2px; border-radius:4px;}

  main code:not(.tok):not(.param){
    font-family:var(--mono); font-size:0.85em; background:var(--indigo-pale);
    color:var(--indigo); padding:1.5px 6px; border-radius:6px;
  }

  /* ---------- topbar ---------- */
  .topbar{
    position:fixed; top:0; left:0; right:0; height:var(--header-h); z-index:100;
    background:rgba(255,255,255,0.9); backdrop-filter:blur(12px);
    border-bottom:1px solid #EEEEEE; display:flex; align-items:center;
  }
  .topbar-inner{width:100%; max-width:var(--maxw); margin:0 auto; padding:0 28px; display:flex; align-items:center; justify-content:space-between;}
  .brand{display:flex; align-items:center; gap:10px;}
  .brand-mark{height:26px; width:auto; flex:none; display:block;}
  .brand-name{font-family:var(--disp); font-weight:700; font-size:17px; letter-spacing:-0.02em;}
  .brand-sub{font-family:var(--ui); font-size:10px; color:var(--muted); font-weight:600; letter-spacing:0.09em; text-transform:uppercase; margin-left:9px; padding-left:9px; border-left:1px solid var(--border);}
  .topbar-nav{display:flex; align-items:center; gap:8px;}
  .topbar-nav a.link{font-family:var(--ui); font-size:14.5px; font-weight:600; color:var(--ink); padding:6px 16px; position:relative;}
  .topbar-nav a.link::after{content:""; position:absolute; left:16px; right:16px; bottom:-22px; height:2px; background:var(--red-orig); opacity:0; transition:.15s;}
  .topbar-nav a.link:hover::after{opacity:1;}
  .btn-primary{
    font-family:var(--ui); font-size:14.5px; font-weight:600; padding:9px 20px; border-radius:8px; color:#fff;
    background:var(--indigo); border:1px solid var(--indigo-deep); cursor:pointer; margin-left:10px;
    transition:filter .15s, transform .15s;
  }
  .btn-primary:hover{filter:brightness(1.1); transform:translateY(-1px);}
  .btn-pill{border-radius:53px; padding:11px 26px;}
  .menu-toggle{display:none; width:34px;height:34px;border-radius:8px;border:1px solid var(--border); background:var(--surface); align-items:center; justify-content:center; cursor:pointer; margin-right:4px;}
  .menu-toggle svg{width:17px;height:17px;stroke:var(--ink-soft);}

  /* ---------- shell ---------- */
  .shell{max-width:var(--maxw); margin:0 auto; padding-top:var(--header-h); display:grid; grid-template-columns:var(--sidebar-w) minmax(0,1fr) var(--toc-w);}

  /* ---------- sidebar ---------- */
  .sidebar{position:sticky; top:var(--header-h); height:calc(100vh - var(--header-h)); overflow-y:auto; padding:26px 16px 48px 28px; border-right:1px solid var(--border-soft);}
  .side-group{margin-bottom:22px;}
  .side-label{font-family:var(--ui); font-size:10.5px; font-weight:700; letter-spacing:0.09em; text-transform:uppercase; color:var(--faint); margin:0 0 8px 10px;}
  .side-link{display:flex; align-items:center; gap:9px; font-family:var(--ui); font-size:13.8px; font-weight:500; color:var(--ink-soft); padding:7px 10px; border-radius:8px; margin-bottom:1px; transition:background .13s,color .13s;}
  .side-link .dot{width:5px;height:5px;border-radius:50%;background:var(--border);flex:none;transition:background .13s;}
  .side-link:hover{background:var(--bg-tint); color:var(--indigo);}
  .side-link.active{background:var(--indigo-pale); color:var(--indigo); font-weight:700;}
  .side-link.active .dot{background:var(--indigo);}
  .m-badge{font-family:var(--mono); font-size:9.5px; font-weight:600; padding:2px 6px; border-radius:5px; margin-left:auto;}
  .m-post{background:var(--indigo-pale); color:var(--indigo);}
  .m-get{background:var(--violet-pale); color:var(--violet);}
  .m-202{background:var(--red-pale); color:var(--red);}

  /* ---------- main ---------- */
  main{padding:44px 48px 120px; min-width:0;}
  section.block{margin-bottom:54px; scroll-margin-top:86px;}
  section.block h2{font-size:26px; margin-bottom:11px;}
  section.block h3{font-size:17px; margin:26px 0 9px; font-weight:600;}

  .eyebrow{display:inline-flex; align-items:center; gap:8px; font-family:var(--ui); font-size:11px; font-weight:600; letter-spacing:0.09em; text-transform:uppercase; color:var(--indigo); background:var(--indigo-pale); padding:5px 13px; border-radius:99px; margin-bottom:18px;}
  .eyebrow::before{content:""; width:6px;height:6px;border-radius:50%;background:var(--red-orig);}
  .page-title{font-size:42px; font-weight:700; letter-spacing:-0.025em; margin-bottom:16px; line-height:1.08;}
  .page-lede{font-size:18px; color:var(--ink-soft); max-width:660px; margin-bottom:26px; line-height:1.5;}

  .endpoint-pill{display:inline-flex; align-items:center; gap:11px; background:var(--surface); border:1px solid var(--border); padding:8px 9px 8px 9px; border-radius:12px; margin-bottom:34px; font-family:var(--mono); font-size:13.5px; color:var(--ink); box-shadow:0 4px 14px rgba(50,41,150,0.06);}
  .endpoint-pill .m{color:#fff; font-family:var(--ui); font-weight:700; font-size:11px; padding:5px 10px; border-radius:7px; letter-spacing:0.03em;}
  .m-fill-post{background:var(--grad-135);}
  .m-fill-get{background:var(--violet);}
  .m-fill-202{background:var(--red);}

  /* ---------- signature: inputs -> image ad ---------- */
  .assembly{
    border:1px solid var(--border); border-radius:24px;
    background:linear-gradient(116deg,#F4EDF9 0%, #ECE9FB 100%);
    padding:26px 26px 28px; margin-bottom:46px; box-shadow:0 14px 40px -20px rgba(75,49,209,0.35);
  }
  .assembly-label{font-family:var(--ui); font-size:11px; font-weight:700; letter-spacing:0.09em; text-transform:uppercase; color:var(--indigo); margin-bottom:18px;}
  .assembly-row{display:grid; grid-template-columns:1fr auto 1.02fr; gap:20px; align-items:center;}
  .inputs{display:flex; flex-direction:column; gap:10px;}
  .in-chip{
    display:flex; align-items:center; gap:12px; padding:11px 14px;
    border:1px solid var(--border); border-left:3px solid var(--accent,var(--indigo));
    border-radius:12px; background:var(--surface);
    opacity:0; transform:translateX(-8px); animation:slideIn .5s ease forwards;
  }
  .in-chip:nth-child(1){--accent:var(--indigo); animation-delay:.05s;}
  .in-chip:nth-child(2){--accent:var(--violet); animation-delay:.18s;}
  .in-chip:nth-child(3){--accent:var(--red);    animation-delay:.31s;}
  .in-chip:nth-child(4){--accent:var(--logo-gold); animation-delay:.44s;}
  @keyframes slideIn{to{opacity:1; transform:translateX(0);}}
  .in-chip .ico{width:32px;height:32px;border-radius:9px; flex:none; display:grid; place-items:center; font-size:15px; background:color-mix(in srgb, var(--accent) 12%, #fff); color:var(--accent);}
  .in-chip .tx b{display:block; font-family:var(--mono); font-size:12.5px; color:var(--ink); font-weight:600;}
  .in-chip .tx span{font-family:var(--ui); font-size:11.5px; color:var(--muted);}

  .assembly-arrow{display:flex; flex-direction:column; align-items:center; gap:6px; color:var(--red); opacity:0; animation:fadeIn .5s ease forwards .6s;}
  @keyframes fadeIn{to{opacity:1;}}
  .assembly-arrow svg{width:36px;height:36px;}
  .assembly-arrow small{font-family:var(--mono); font-size:10px; color:var(--indigo); letter-spacing:0.04em;}

  .ad-out{border-radius:16px; overflow:hidden; border:1px solid var(--border); background:var(--surface); box-shadow:0 16px 44px -18px rgba(50,41,150,0.4); opacity:0; transform:translateY(10px) scale(.98); animation:popIn .6s cubic-bezier(.2,.8,.2,1) forwards .72s;}
  @keyframes popIn{to{opacity:1; transform:none;}}
  .ad-scene{position:relative; aspect-ratio:4/3; padding:18px; display:flex; flex-direction:column; justify-content:space-between; background:radial-gradient(85% 70% at 80% 20%, #F6DCEA 0%, transparent 60%), radial-gradient(90% 80% at 12% 92%, #DCD0FA 0%, transparent 55%), linear-gradient(150deg,#F5EEFF 0%, #FBEFF4 100%);}
  .ad-scene::after{content:""; position:absolute; inset:0; pointer-events:none; background:linear-gradient(115deg,transparent 38%, rgba(255,255,255,0.55) 50%, transparent 62%); background-size:220% 100%; animation:sheen 3.6s ease-in-out infinite;}
  @keyframes sheen{0%{background-position:170% 0;}60%,100%{background-position:-70% 0;}}
  .ad-ratios{display:flex; gap:6px; align-self:flex-start; z-index:2;}
  .ad-ratios span{font-family:var(--mono); font-size:9.5px; font-weight:600; color:var(--indigo); background:rgba(255,255,255,0.8); border:1px solid rgba(50,41,150,0.16); padding:2px 7px; border-radius:5px; backdrop-filter:blur(3px);}
  .ad-bottle{position:absolute; top:50%; left:50%; transform:translate(-50%,-52%); width:52px; height:96px; border-radius:14px 14px 16px 16px; background:linear-gradient(160deg,#fff 0%, #EFE7FF 60%, #E4D8FF 100%); border:1px solid rgba(75,49,209,0.22); box-shadow:0 10px 22px -8px rgba(75,49,209,0.45); z-index:1;}
  .ad-bottle::before{content:""; position:absolute; top:11px; left:9px; width:9px; height:64px; border-radius:6px; background:linear-gradient(180deg,rgba(255,255,255,0.9),rgba(255,255,255,0.1));}
  .ad-bottle::after{content:""; position:absolute; top:-8px; left:50%; transform:translateX(-50%); width:22px; height:12px; border-radius:4px; background:#C4B3F2;}
  .ad-text{position:relative; z-index:2;}
  .ad-text h4{font-family:var(--disp); font-weight:700; font-size:16px; color:#2A1D5E; line-height:1.12; margin-bottom:3px;}
  .ad-text p{font-family:var(--ui); font-size:11px; color:#6A5A93; margin:0 0 9px;}
  .ad-text .cta{display:inline-block; font-family:var(--ui); font-size:11px; font-weight:600; color:#fff; background:var(--indigo); padding:6px 14px; border-radius:53px;}
  .ad-foot{display:flex; align-items:center; justify-content:space-between; padding:9px 13px; border-top:1px solid var(--border-soft); background:var(--surface);}
  .ad-foot small{font-family:var(--mono); font-size:10px; color:var(--faint);}
  .ad-foot .stat{display:flex; align-items:center; gap:6px; font-family:var(--mono); font-size:10px; color:var(--indigo); font-weight:600;}
  .ad-foot .stat svg{width:12px;height:12px;}

  /* ---------- steps ---------- */
  .step-kicker{display:flex; align-items:center; gap:12px; margin-bottom:9px;}
  .step-num{width:28px;height:28px;border-radius:9px; flex:none; display:grid; place-items:center; font-family:var(--disp); font-weight:700; font-size:13px; color:#fff; background:var(--grad-135); box-shadow:0 4px 11px rgba(180,40,80,0.28);}
  .step-kicker h2{margin:0;}

  ul.plain{margin:0 0 14px; padding-left:0; list-style:none;}
  ul.plain li{position:relative; padding-left:22px; margin-bottom:8px; color:var(--ink-soft);}
  ul.plain li::before{content:""; position:absolute; left:4px; top:9px; width:7px;height:7px;border-radius:2px; background:var(--grad-135); transform:rotate(45deg);}
  ul.plain li b{color:var(--ink);}

  /* ---------- callouts ---------- */
  .callout{display:flex; gap:12px; align-items:flex-start; border-radius:12px; padding:14px 16px; margin:18px 0 22px; font-size:14px; color:var(--ink-soft); border:1px solid var(--border-soft); border-left:3px solid var(--indigo); background:var(--indigo-pale);}
  .callout svg{width:18px;height:18px; flex:none; margin-top:1px;}
  .callout b{color:var(--ink);}
  .callout.warn{border-left-color:var(--red); background:var(--red-pale);}
  .callout.info{border-left-color:var(--violet); background:var(--violet-pale);}

  /* ---------- tables ---------- */
  .tbl-wrap{border:1px solid var(--border); border-radius:var(--radius-sm); overflow:hidden; overflow-x:auto; margin-bottom:22px; background:var(--surface); box-shadow:0 4px 16px -8px rgba(50,41,150,0.1);}
  table{width:100%; border-collapse:collapse; font-size:13.6px; min-width:560px;}
  thead th{text-align:left; background:var(--bg-tint); color:var(--indigo); font-family:var(--ui); font-weight:700; font-size:11px; letter-spacing:0.05em; text-transform:uppercase; padding:11px 16px; border-bottom:1px solid var(--border);}
  tbody td{padding:11px 16px; border-bottom:1px solid var(--border-soft); vertical-align:top; color:var(--ink-soft);}
  tbody tr:last-child td{border-bottom:none;}
  tbody tr:hover td{background:#FBFAFE;}
  td.param{font-family:var(--mono); font-size:12.6px; color:var(--ink); white-space:nowrap;}
  td.param .nest{color:var(--faint); user-select:none;}
  td.param code, td code{background:none; padding:0; color:var(--indigo); font-size:12.4px;}
  .req{display:inline-block; font-family:var(--ui); font-size:10.5px; font-weight:700; padding:2.5px 9px; border-radius:99px; letter-spacing:0.02em;}
  .req.mandatory{background:var(--mandatory-bg); color:var(--mandatory);}
  .req.optional{background:var(--optional-bg); color:var(--optional);}

  /* ---------- light code blocks ---------- */
  .code-card{border:1px solid var(--code-border); border-radius:var(--radius); overflow:hidden; margin-bottom:22px; background:var(--code-bg);}
  .code-tabs{display:flex; background:var(--code-tabbar); border-bottom:1px solid var(--code-border); padding:0 4px;}
  .code-tab{font-family:var(--mono); font-size:12px; font-weight:500; color:var(--muted); padding:10px 15px; cursor:pointer; border:none; background:none; border-bottom:2px solid transparent;}
  .code-tab:hover{color:var(--ink);}
  .code-tab.active{color:var(--indigo); border-bottom-color:var(--red);}
  .code-body{position:relative;}
  .code-panel{display:none; padding:16px 18px; overflow-x:auto;}
  .code-panel.active{display:block;}
  .code-panel pre{margin:0; color:var(--code-ink); font-family:var(--mono); font-size:12.7px; line-height:1.7; white-space:pre;}
  .copy-btn{position:absolute; top:9px; right:12px; z-index:2; font-family:var(--ui); font-size:11px; font-weight:600; color:var(--muted); background:rgba(255,255,255,0.9); border:1px solid var(--code-border); padding:5px 11px; border-radius:7px; cursor:pointer;}
  .copy-btn:hover{color:var(--indigo); border-color:var(--violet);}
  .copy-btn.done{color:var(--indigo); border-color:var(--indigo);}
  .tok-key{color:var(--code-key);}
  .tok-str{color:var(--code-str);}
  .tok-num{color:var(--code-num);}
  .tok-punc{color:var(--code-punc);}
  .tok-com{color:var(--code-com);}
  .tok-verb{color:var(--code-verb); font-weight:600;}
  .tok-flag{color:var(--code-flag);}

  /* ---------- help card ---------- */
  .help-card{border:1px solid var(--border); border-radius:24px; padding:30px 32px; background:linear-gradient(116deg,#FFFFFF 0%, #F1EBFB 100%); display:flex; align-items:center; justify-content:space-between; gap:20px; flex-wrap:wrap;}
  .help-card h3{font-size:20px; margin-bottom:6px;}
  .help-card p{margin:0; max-width:440px;}

  /* ---------- TOC ---------- */
  .toc{position:sticky; top:var(--header-h); height:calc(100vh - var(--header-h)); overflow-y:auto; padding:36px 22px 40px 18px;}
  .toc-title{font-family:var(--ui); font-size:10.5px; font-weight:700; letter-spacing:0.08em; text-transform:uppercase; color:var(--faint); margin-bottom:12px;}
  .toc a{display:block; font-size:12.6px; color:var(--muted); padding:5px 0 5px 14px; border-left:2px solid var(--border-soft); margin-bottom:1px; transition:.13s;}
  .toc a:hover{color:var(--indigo);}
  .toc a.active{color:var(--indigo); border-left-color:var(--indigo); font-weight:600;}

  .sidebar::-webkit-scrollbar,.toc::-webkit-scrollbar{width:6px;}
  .sidebar::-webkit-scrollbar-thumb,.toc::-webkit-scrollbar-thumb{background:var(--border); border-radius:3px;}

  @media (max-width:1120px){.shell{grid-template-columns:var(--sidebar-w) minmax(0,1fr);} .toc{display:none;}}
  @media (max-width:860px){
    .shell{grid-template-columns:1fr;}
    .sidebar{position:fixed; left:0; top:var(--header-h); width:80%; max-width:300px; background:var(--bg); z-index:90; transform:translateX(-100%); transition:transform .25s ease; box-shadow:8px 0 30px rgba(50,41,150,0.14);}
    .sidebar.open{transform:translateX(0);}
    .menu-toggle{display:flex;}
    .topbar-nav a.link{display:none;}
    main{padding:30px 20px 100px;}
    .page-title{font-size:31px;}
    .assembly-row{grid-template-columns:1fr;}
    .assembly-arrow{transform:rotate(90deg); margin:4px 0;}
  }
  @media (prefers-reduced-motion:reduce){*{animation:none !important; opacity:1 !important; transform:none !important;} html{scroll-behavior:auto;}}