*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
  --bg:#0f172a;--bg2:#1e293b;--bg3:#334155;
  --border:#334155;--border2:#475569;
  --text:#e2e8f0;--text2:#94a3b8;--text3:#64748b;
  --primary:#f7df1e;--primary-dark:#d4ba00;--primary-bg:rgba(247,223,30,.1);
  --green:#22c55e;--green-bg:rgba(34,197,94,.1);
  --yellow:#f59e0b;--red:#ef4444;--blue:#38bdf8;
  --nav-h:56px;--toolbar-h:45px;--ad-h:60px;--footer-h:54px;--tab-h:56px;
  --radius:8px;--rsm:4px;
  --mono:'SF Mono','Fira Code','Cascadia Code',Consolas,'Source Code Pro',monospace;
}
[data-theme="light"]{
  --bg:#f8fafc;--bg2:#ffffff;--bg3:#f1f5f9;
  --border:#e2e8f0;--border2:#cbd5e1;
  --text:#1e293b;--text2:#475569;--text3:#94a3b8;
}
html{font-size:14px;scroll-behavior:smooth}
body{background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;line-height:1.5}

/* NAV */
.site-nav{height:var(--nav-h);background:var(--bg2);border-bottom:1px solid var(--border);display:flex;align-items:center;padding:0 16px;gap:10px;position:sticky;top:0;z-index:200}
.nav-brand{font-weight:700;font-size:15px;color:var(--text);text-decoration:none;display:flex;align-items:center;gap:8px;white-space:nowrap;flex-shrink:0}
.nav-links{display:flex;align-items:center;gap:4px;margin-left:auto}
.site-nav .theme-btn{flex-shrink:0}
.nav-link{color:var(--text2);text-decoration:none;padding:5px 10px;border-radius:var(--rsm);font-size:13px;white-space:nowrap;transition:color .15s,background .15s}
.nav-link:hover{color:var(--text);background:var(--bg3)}
.nav-sep{color:var(--text3);font-size:12px}
.theme-btn{background:none;border:1px solid var(--border2);color:var(--text2);padding:5px 10px;border-radius:var(--rsm);cursor:pointer;font-size:12px;transition:all .15s;white-space:nowrap}
.theme-btn:hover{color:var(--text);border-color:var(--primary)}

/* WORKSPACE */
.workspace-block{
  height:calc(100vh - var(--nav-h));
  display:flex;flex-direction:column;overflow:hidden;
}

/* TOOLBAR */
.toolbar{
  height:var(--toolbar-h);padding:0 12px;
  background:var(--bg2);border-bottom:1px solid var(--border);
  display:flex;align-items:center;gap:6px;flex-wrap:nowrap;overflow-x:auto;flex-shrink:0;
}
.toolbar::-webkit-scrollbar{height:0}
.toolbar-sep{width:1px;height:22px;background:var(--border2);margin:0 2px;flex-shrink:0}
.btn{
  display:inline-flex;align-items:center;gap:4px;
  padding:5px 11px;border-radius:var(--rsm);border:1px solid var(--border2);
  cursor:pointer;font-size:12px;font-weight:500;transition:all .15s;white-space:nowrap;
  background:var(--bg3);color:var(--text);flex-shrink:0;
}
.btn:hover{border-color:var(--primary);color:var(--primary)}
.btn-accent{background:var(--primary);color:#0f172a;border-color:var(--primary)}
.btn-accent:hover{background:var(--primary-dark);border-color:var(--primary-dark);color:#0f172a}
.btn.done{background:var(--green-bg)!important;color:var(--green)!important;border-color:var(--green)!important}
.indent-sel{
  background:var(--bg3);border:1px solid var(--border2);color:var(--text);
  padding:4px 8px;border-radius:var(--rsm);font-size:12px;cursor:pointer;flex-shrink:0;
}
.indent-sel:focus{outline:none;border-color:var(--primary)}
.upload-wrap{position:relative;overflow:hidden;flex-shrink:0}
.upload-wrap input{position:absolute;inset:0;opacity:0;cursor:pointer;font-size:0;width:100%;height:100%}
.semi-wrap{display:flex;align-items:center;gap:5px;flex-shrink:0;font-size:12px;color:var(--text2)}
.semi-wrap input[type=checkbox]{accent-color:var(--primary);cursor:pointer}

/* SPLIT EDITOR */
.editor-row{flex:1;display:flex;overflow:hidden;min-height:0}
.pane{display:flex;flex-direction:column;overflow:hidden;min-width:0}
.pane-hdr{
  height:32px;padding:0 12px;background:var(--bg2);border-bottom:1px solid var(--border);
  display:flex;align-items:center;gap:8px;font-size:12px;color:var(--text2);flex-shrink:0;
}
.pane-hdr-title{font-weight:600;color:var(--text);font-size:12px}
.pane-acts{margin-left:auto;display:flex;gap:4px}
.pane-btn{
  background:none;border:1px solid var(--border2);color:var(--text2);
  padding:2px 8px;border-radius:var(--rsm);cursor:pointer;font-size:11px;transition:all .15s;
}
.pane-btn:hover{color:var(--text);border-color:var(--primary)}
.pane-btn.done{color:var(--green);border-color:var(--green)}

/* RESIZER */
.resizer{
  width:5px;background:var(--border);cursor:col-resize;flex-shrink:0;
  transition:background .15s;
}
.resizer:hover,.resizer.active{background:var(--primary)}

/* CODE EDITOR */
.editor-wrap{flex:1;position:relative;display:flex;overflow:hidden;min-height:0}
.line-nums{
  width:44px;background:var(--bg2);border-right:1px solid var(--border);
  overflow:hidden;padding:12px 0;text-align:right;
  font:13px/1.6 var(--mono);color:var(--text3);
  pointer-events:none;user-select:none;flex-shrink:0;
  position:relative;
}
.line-nums-inner{position:relative;min-height:100%}
.line-nums-chunk{position:absolute;left:0;right:0;top:0}
.line-num{padding-right:8px;display:block}
.editor-wrap.wrap-on .line-nums{
  width:0;padding:0;border-right:none;opacity:0;
}
.editor-wrap.wrap-on .code-ta{padding-left:12px}
.code-ta{
  flex:1;resize:none;border:none;outline:none;
  background:var(--bg);color:var(--text);
  font:13px/1.6 var(--mono);
  padding:12px 12px 12px 4px;
  overflow:auto;tab-size:2;white-space:pre;word-break:normal;overflow-wrap:normal;
  caret-color:var(--primary);
  scrollbar-width:auto;
  scrollbar-color:var(--border2) transparent;
}
.code-ta::selection{background:rgba(247,223,30,.2)}
.code-ta.busy{opacity:.5}
.code-ta.has-sample{color:var(--text3)}
.code-ta.wrap-on,.result-ta.wrap-on{
  white-space:pre-wrap;
  word-break:break-word;
  overflow-wrap:anywhere;
}
.code-ta::-webkit-scrollbar,.result-ta::-webkit-scrollbar{width:14px;height:5px}
.code-ta::-webkit-scrollbar-track,.result-ta::-webkit-scrollbar-track{background:transparent}
.code-ta::-webkit-scrollbar-thumb,.result-ta::-webkit-scrollbar-thumb{
  background:var(--border2);
  border-radius:10px;
  border:2px solid var(--bg);
}
.code-ta::-webkit-scrollbar-thumb:hover,.result-ta::-webkit-scrollbar-thumb:hover{background:var(--text2)}
.code-ta::-webkit-scrollbar-corner,.result-ta::-webkit-scrollbar-corner{background:transparent}

/* RESULT AREA */
.result-area{display:flex;flex-direction:column;overflow:hidden;min-height:0;flex:1}
.tabs-row{display:flex;background:var(--bg2);border-bottom:1px solid var(--border);flex-shrink:0}
.tab-btn{
  padding:7px 14px;font-size:12px;color:var(--text2);
  cursor:pointer;border-bottom:2px solid transparent;
  transition:all .15s;white-space:nowrap;
  background:none;border-top:none;border-left:none;border-right:none;
}
.tab-btn:hover{color:var(--text)}
.tab-btn.on{color:var(--primary);border-bottom-color:var(--primary)}
.badge{
  display:inline-flex;align-items:center;justify-content:center;
  min-width:15px;height:15px;padding:0 3px;
  background:var(--red);color:#fff;border-radius:8px;font-size:10px;margin-left:4px;
}
.tab-panels{flex:1;overflow:hidden;position:relative;min-height:0}
.tab-panel{display:none;position:absolute;inset:0;flex-direction:column}
.tab-panel.on{display:flex}

/* RESULT TEXTAREA */
.result-ta{
  flex:1;resize:none;border:none;outline:none;
  background:var(--bg);color:var(--text);
  font:13px/1.6 var(--mono);padding:12px;
  overflow:auto;white-space:pre;word-break:normal;overflow-wrap:normal;
  scrollbar-width:auto;
  scrollbar-color:var(--border2) transparent;
}

/* AUDIT / TIPS WRAP */
.audit-wrap,.tips-wrap{padding:16px;overflow-y:auto;height:100%}
.audit-stats-row{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:16px}
.ast-card{
  background:var(--bg2);border:1px solid var(--border);border-radius:var(--radius);
  padding:8px 12px;text-align:center;min-width:72px;
}
.ast-num{font-size:18px;font-weight:700;color:var(--primary)}
.ast-lbl{font-size:10px;color:var(--text2);margin-top:2px}
.audit-list{display:flex;flex-direction:column;gap:8px}
.audit-card{
  background:var(--bg2);border:1px solid var(--border);border-radius:var(--radius);
  padding:12px;display:flex;align-items:flex-start;gap:10px;
}
.audit-card.lvl-error{border-left:3px solid var(--red)}
.audit-card.lvl-warn{border-left:3px solid var(--yellow)}
.audit-card.lvl-info{border-left:3px solid var(--blue)}
.audit-card.lvl-ok{border-left:3px solid var(--green)}
.ai-icon{font-size:15px;flex-shrink:0;margin-top:1px}
.ai-body{flex:1;min-width:0}
.ai-title{font-weight:600;font-size:13px;margin-bottom:3px}
.ai-desc{font-size:12px;color:var(--text2);line-height:1.5}
.ai-line{font-size:11px;color:var(--primary);cursor:pointer;margin-top:4px;display:inline-block;text-decoration:underline}
.empty-tip{color:var(--text3);text-align:center;padding:40px 16px;font-size:13px}

/* ES VERSION */
.es-wrap{padding:16px;overflow-y:auto;height:100%}
.es-intro{font-size:13px;color:var(--text2);margin-bottom:16px;line-height:1.6;padding:10px 14px;background:var(--primary-bg);border-left:3px solid var(--primary);border-radius:0 var(--rsm) var(--rsm) 0}
.es-group{margin-bottom:16px}
.es-ver-tag{
  display:inline-flex;align-items:center;padding:3px 10px;
  background:var(--primary);color:#0f172a;border-radius:20px;
  font-size:11px;font-weight:700;margin-bottom:8px;
}
.chip-cloud{display:flex;flex-wrap:wrap;gap:6px}
.chip{
  background:var(--bg2);border:1px solid var(--border);border-radius:20px;
  padding:3px 10px;font-size:12px;color:var(--text2);
  display:flex;align-items:center;gap:4px;
}

/* DIFF VIEW */
.diff-wrap{padding:0;overflow-y:auto;height:100%;display:flex;flex-direction:column}
.diff-view{flex:1;min-height:0;display:flex;flex-direction:column}
.diff-stats{
  display:flex;gap:10px;padding:8px 14px;
  background:var(--bg2);border-bottom:1px solid var(--border);font-size:12px;flex-shrink:0;
}
.diff-stat-add{color:var(--green)}
.diff-stat-rem{color:var(--red)}
.diff-lines{flex:1;overflow-y:auto;font:12px/1.7 var(--mono);padding:4px 0}
.diff-line{padding:1px 14px;white-space:pre-wrap;word-break:break-all}
.diff-add{background:rgba(34,197,94,.12);color:var(--green)}
.diff-rem{background:rgba(239,68,68,.1);color:var(--red);text-decoration:line-through;opacity:.7}
.diff-ctx{color:var(--text3)}
.diff-skip{color:var(--text2);background:var(--bg2);font-style:italic}
.diff-prefix{display:inline-block;width:14px;flex-shrink:0;opacity:.7}
.diff-empty{color:var(--text3);text-align:center;padding:40px 16px;font-size:13px}

/* AD BAR */
.ad-bar{
  height:var(--ad-h);flex-shrink:0;
  background:var(--bg2);border-top:2px dashed var(--border2);
  display:flex;align-items:center;justify-content:center;
  color:var(--text3);font-size:12px;gap:6px;
}
.ad-bar a{color:var(--primary);text-decoration:none}
.ad-bar a:hover{text-decoration:underline}

/* CONTENT SECTIONS */
.content-zone{background:var(--bg)}
.article-block{max-width:860px;margin:0 auto;padding:48px 24px 32px}
.article-block h2{font-size:22px;font-weight:700;margin-bottom:16px;color:var(--text)}
.article-block h3{font-size:15px;font-weight:600;margin:20px 0 8px;color:var(--text)}
.article-block p{color:var(--text2);line-height:1.8;margin-bottom:12px;font-size:14px}
.article-block ul{color:var(--text2);line-height:1.8;padding-left:20px;margin-bottom:12px;font-size:14px}
.article-block li{margin-bottom:5px}
.article-block code{
  background:var(--bg3);padding:1px 5px;border-radius:3px;
  font-family:var(--mono);font-size:12px;color:var(--primary);
}

/* FAQ */
.faq-block{max-width:860px;margin:0 auto;padding:0 24px 48px}
.faq-block h2{font-size:20px;font-weight:700;margin-bottom:16px;color:var(--text)}
.faq-item{border:1px solid var(--border);border-radius:var(--radius);margin-bottom:10px;overflow:hidden}
.faq-q{
  padding:13px 16px;font-weight:600;cursor:pointer;
  display:flex;align-items:center;justify-content:space-between;
  font-size:14px;background:var(--bg2);user-select:none;
}
.faq-q::after{content:'▸';color:var(--text3);transition:transform .2s;font-size:12px}
.faq-item.open .faq-q::after{transform:rotate(90deg)}
.faq-a{
  max-height:0;overflow:hidden;
  transition:max-height .3s,padding .3s;
  color:var(--text2);font-size:13px;line-height:1.7;padding:0 16px;
}
.faq-item.open .faq-a{max-height:260px;padding:12px 16px 14px}

/* FOOTER */
.site-footer{
  background:var(--bg2);border-top:1px solid var(--border);
  padding:14px 24px;text-align:center;font-size:12px;color:var(--text3);
}
.site-footer a{color:var(--text3);text-decoration:none;margin:0 6px}
.site-footer a:hover{color:var(--primary)}
.footer-brand{margin-top:5px;font-size:11px;color:var(--text3)}

/* TOAST */
.toast{
  position:fixed;bottom:72px;left:50%;transform:translateX(-50%) translateY(16px);
  background:var(--bg3);border:1px solid var(--border2);color:var(--text);
  padding:9px 18px;border-radius:var(--radius);font-size:13px;
  opacity:0;transition:all .2s;pointer-events:none;z-index:9999;white-space:nowrap;
}
.toast.show{opacity:1;transform:translateX(-50%) translateY(0)}

/* PROGRESS */
.prog{
  height:2px;background:var(--primary);position:fixed;
  top:var(--nav-h);left:0;width:0;z-index:300;transition:width .25s;display:none;
}
.prog.on{display:block}

/* BACK TO TOP */
.back-top{
  position:fixed;right:20px;bottom:80px;
  width:40px;height:40px;border-radius:50%;
  background:var(--primary);color:#0f172a;border:none;
  font-size:18px;font-weight:700;cursor:pointer;
  display:flex;align-items:center;justify-content:center;
  opacity:0;transform:translateY(10px);
  transition:opacity .2s,transform .2s;
  pointer-events:none;z-index:150;
  box-shadow:0 2px 10px rgba(0,0,0,.3);
}
.back-top.show{opacity:1;transform:translateY(0);pointer-events:auto}
.back-top:hover{background:var(--primary-dark)}
@media(max-width:768px){
  .back-top{
    bottom:calc(var(--tab-h) + env(safe-area-inset-bottom,0px) + 12px);
    right:14px;width:36px;height:36px;font-size:16px;
  }
}

/* SCROLLBAR */
::-webkit-scrollbar{width:5px;height:5px}
::-webkit-scrollbar-track{background:transparent}
::-webkit-scrollbar-thumb{background:var(--border2);border-radius:3px}
::-webkit-scrollbar-thumb:hover{background:var(--text3)}

/* TUTORIAL */
.tutorial-block{max-width:860px;margin:0 auto;padding:0 24px 48px}
.tutorial-block h2{font-size:20px;font-weight:700;margin-bottom:8px;color:var(--text)}
.tutorial-block>.tut-intro{font-size:14px;color:var(--text2);line-height:1.8;margin-bottom:24px}
.tut-step{margin-bottom:32px}
.tut-step-title{font-size:15px;font-weight:600;color:var(--text);margin-bottom:12px;display:flex;align-items:center;gap:8px}
.tut-step-num{
  display:inline-flex;align-items:center;justify-content:center;
  width:22px;height:22px;border-radius:50%;
  background:var(--primary);color:#0f172a;font-size:11px;font-weight:700;flex-shrink:0;
}
.code-compare{display:flex;gap:12px;align-items:stretch}
.code-compare-col{flex:1;min-width:0;display:flex;flex-direction:column}
.code-label{
  font-size:11px;font-weight:600;padding:5px 10px;border-radius:var(--rsm) var(--rsm) 0 0;
  display:flex;align-items:center;gap:5px;
}
.code-label.before{background:rgba(239,68,68,.12);color:var(--red)}
.code-label.after{background:rgba(34,197,94,.12);color:var(--green)}
.code-block{
  flex:1;margin:0;padding:12px 14px;
  background:var(--bg2);border:1px solid var(--border);
  border-radius:0 0 var(--rsm) var(--rsm);
  font:12px/1.7 var(--mono);color:var(--text);
  overflow-x:auto;white-space:pre-wrap;word-break:break-all;tab-size:2;
}
.tut-desc{font-size:13px;color:var(--text2);line-height:1.7;margin-top:10px}
.tut-tip{
  background:var(--primary-bg);border-left:3px solid var(--primary);
  border-radius:0 var(--rsm) var(--rsm) 0;
  padding:10px 14px;font-size:13px;color:var(--text2);line-height:1.6;margin-top:10px;
}
.tut-tip strong{color:var(--primary)}

/* MOBILE TAB BAR */
.mob-tabs{
  display:none;position:fixed;bottom:0;left:0;right:0;
  height:var(--tab-h);background:var(--bg2);border-top:1px solid var(--border);
  z-index:200;
}
.mob-tab{
  flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;
  gap:2px;background:none;border:none;color:var(--text2);cursor:pointer;
  padding:5px 0;font-size:11px;transition:color .15s;
}
.mob-tab .ico{font-size:20px;line-height:1}
.mob-tab.on{color:var(--primary)}

/* SR-ONLY */
.sr-only{
  position:absolute;width:1px;height:1px;padding:0;margin:-1px;
  overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0;
}

/* MOBILE */
@media(max-width:768px){
  .workspace-block{
    height:calc(100vh - var(--nav-h) - var(--tab-h));
    height:calc(100dvh - var(--nav-h) - var(--tab-h) - env(safe-area-inset-bottom,0px));
    height:calc(var(--real-vh,100dvh) - var(--nav-h) - var(--tab-h) - env(safe-area-inset-bottom,0px));
  }
  .code-ta,.result-ta{font-size:16px}
  .mob-tabs{
    display:flex;
    height:calc(var(--tab-h) + env(safe-area-inset-bottom,0px));
    padding-bottom:env(safe-area-inset-bottom,0px);
  }
  .toast{
    bottom:calc(var(--tab-h) + env(safe-area-inset-bottom,0px) + 10px);
  }
  .site-nav .nav-links{display:none}
  .site-nav .theme-btn{margin-left:auto}
  .resizer{display:none}
  .editor-row{flex-direction:column}
  .pane,.result-area{display:none;flex:1}
  .pane.mob-on,.result-area.mob-on{display:flex;width:100%!important}
  .ad-bar{display:none}
  .tabs-row{overflow-x:auto}
  .tabs-row::-webkit-scrollbar{height:0}
}
@media(min-width:769px){
  .mob-tabs{display:none!important}
  .pane{display:flex}
  .result-area{display:flex}
}
@media(max-width:640px){
  .code-compare{flex-direction:column}
}