:root {
  --bg:#fff; --text:#222; --muted:#888; --line:#eee; --panel:#fff; --button:#222; --button-text:#fff;
  --gutter:#f8f8f8; --gutter-text:#aaa; --warning-bg:#fff8e6; --warning-text:#8a6d1d;
  --shadow:0 10px 40px rgba(0,0,0,.08); --bar-bg:rgba(255,255,255,.96);
}
:root[data-theme="dark"] {
  --bg:#111315; --text:#e8e8e8; --muted:#92979d; --line:#2a2d31; --panel:#181b1f; --button:#f1f1f1; --button-text:#111;
  --gutter:#15181b; --gutter-text:#686e75; --warning-bg:#332b18; --warning-text:#e4c46a;
  --shadow:0 10px 40px rgba(0,0,0,.35); --bar-bg:rgba(17,19,21,.96);
}
*{box-sizing:border-box} html,body{margin:0;width:100%;height:100%}
body{background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Arial,sans-serif}
.app{min-height:100vh;display:flex;flex-direction:column;background:var(--bg)}
.editor-shell,.viewer-shell{display:flex;flex:1;min-height:0;background:var(--bg)}
.editor-shell{min-height:calc(100vh - 48px)}
.line-numbers{margin:0;padding:42px 14px 90px 16px;min-width:58px;text-align:right;overflow:hidden;user-select:none;background:var(--gutter);color:var(--gutter-text);border-right:1px solid var(--line);font:16px/1.7 ui-monospace,SFMono-Regular,Consolas,"Liberation Mono",monospace;white-space:pre}
#editor{flex:1;width:100%;min-height:calc(100vh - 48px);border:0;outline:0;resize:none;padding:42px 7vw 90px 24px;font:16px/1.7 ui-monospace,SFMono-Regular,Consolas,"Liberation Mono",monospace;color:var(--text);background:var(--bg);overflow:auto;white-space:pre;overflow-wrap:normal;word-break:normal}
#editor::placeholder{color:var(--gutter-text)}
.bar{height:48px;min-height:48px;border-top:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;padding:0 18px;font-size:12px;color:var(--muted);background:var(--bar-bg);backdrop-filter:blur(8px)}
.left,.right,.status{display:flex;align-items:center;gap:14px}button,a{font:inherit}
.text-btn{border:0;background:none;color:var(--muted);cursor:pointer;text-decoration:none;padding:6px 2px}.text-btn:hover{color:var(--text)}
.save-btn,.primary{border:0;background:var(--button);color:var(--button-text);border-radius:6px;padding:7px 14px;cursor:pointer}.save-btn:hover,.primary:hover{opacity:.86}
dialog{border:1px solid var(--line);border-radius:10px;padding:0;width:min(440px,calc(100vw - 30px));box-shadow:var(--shadow);background:var(--panel);color:var(--text)}
dialog::backdrop{background:rgba(0,0,0,.35);backdrop-filter:blur(2px)}.dialog{padding:24px}.dialog h2{margin:0 0 18px;font-size:18px;font-weight:500}.dialog label{display:block;margin:14px 0 7px;font-size:12px;color:var(--muted)}
.dialog input,.dialog select{width:100%;border:1px solid var(--line);border-radius:6px;padding:10px 11px;outline:0;background:var(--bg);color:var(--text)}.dialog input:focus,.dialog select:focus{border-color:var(--muted)}
.hint{font-size:13px;color:var(--muted);line-height:1.5}.dialog-actions{display:flex;justify-content:flex-end;gap:12px;margin-top:22px}.check{display:flex!important;align-items:center;gap:8px}.check input{width:auto!important}.copy-row{display:flex;gap:8px;margin-bottom:10px}.copy-row input{min-width:0}.warning{background:var(--warning-bg);border-radius:6px;padding:10px;color:var(--warning-text);font-size:12px;line-height:1.5}.advanced{margin-top:14px;color:var(--muted)}.advanced summary{cursor:pointer;font-size:12px}
.toast{position:fixed;left:50%;bottom:70px;transform:translateX(-50%) translateY(10px);background:var(--button);color:var(--button-text);padding:9px 14px;border-radius:7px;font-size:12px;opacity:0;pointer-events:none;transition:.2s;z-index:20}.toast.show{opacity:1;transform:translateX(-50%) translateY(0)}
.view-app{max-width:none;width:100%;margin:auto;min-height:100vh}.view-head{min-height:58px;border-bottom:1px solid var(--line);display:flex;align-items:center;gap:20px;padding:10px 20px;font-size:13px}.back{color:var(--text);text-decoration:none;font-weight:600}.view-heading{flex:1;min-width:0}.muted{color:var(--muted);margin-left:8px}.view-theme{margin-left:auto;white-space:nowrap}
.viewer-shell{min-height:calc(100vh - 106px)}.view-line-numbers{padding:35px 14px 90px 16px}.content{margin:0;padding:35px 30px 90px 24px;flex:1;min-height:calc(100vh - 106px);white-space:pre;word-break:normal;overflow:auto;font:16px/1.7 ui-monospace,SFMono-Regular,Consolas,"Liberation Mono",monospace;color:var(--text);background:var(--bg)}
@media(max-width:760px){.line-numbers{min-width:46px;padding-left:8px;padding-right:10px;font-size:14px}.editor-shell .line-numbers{padding-top:25px}.view-line-numbers{padding-top:24px}#editor{padding:25px 18px 80px 16px;font-size:14px}.content{padding:24px 18px 70px 16px;font-size:14px}.bar{padding:0 10px}.status{display:none}.left,.right{gap:9px}.view-head{gap:10px;padding:10px 14px}.viewMeta{display:block}.muted{display:block;margin:3px 0 0}.bar .left button:nth-child(n+4){display:none}}