:root{font-family:system-ui,-apple-system,'Noto Sans TC',sans-serif;color:#162a40;background:#f5f8fc}*{box-sizing:border-box}body{margin:0}header{background:linear-gradient(110deg,#123b69,#087ea4);color:white;padding:20px clamp(16px,3vw,45px);display:flex;justify-content:space-between;align-items:center;gap:20px}header h1{font-size:25px;margin:0 0 5px}header small{color:#fff}.header-actions{display:flex;align-items:center;gap:18px;flex-wrap:wrap}.header-actions a{color:white;text-decoration:none;border:1px solid #ffffff77;border-radius:8px;padding:9px 12px}main{max-width:1800px;margin:auto;padding:24px clamp(12px,2vw,34px)}nav{display:flex;gap:8px;overflow-x:auto;padding-bottom:12px}button{cursor:pointer;border:1px solid #b6c9dc;background:white;color:#183c5c;border-radius:8px;padding:10px 14px;font:inherit}button:disabled{opacity:.55;cursor:not-allowed}nav button{white-space:nowrap}nav button.active,.primary{background:#086ca3;color:white;border-color:#086ca3}.intro{margin:10px 0 20px}.intro h2{margin:0 0 7px}.intro p{margin:0;color:#49627a}.workspace{display:grid;grid-template-columns:1fr 1fr;gap:18px}.panel{background:white;border:1px solid #dce6ef;border-radius:14px;overflow:hidden;min-width:0;display:flex;flex-direction:column}.panel-head{display:flex;align-items:center;justify-content:space-between;padding:12px 15px;border-bottom:1px solid #e5edf4}.panel-head button{padding:5px 10px}textarea,pre{width:100%;min-height:420px;margin:0;border:0;outline:0;padding:18px;font:14px/1.7 ui-monospace,SFMono-Regular,Consolas,monospace;tab-size:2}textarea{resize:vertical;background:#fbfdff;color:#153750}pre{white-space:pre-wrap;overflow-wrap:anywhere;background:#fff;color:#193750;flex:1}#plots{padding:0 14px;display:flex;flex-direction:column;gap:10px}#plots img{max-width:100%;height:auto;border:1px solid #edf0f5}.toolbar{display:flex;gap:10px;padding:12px 14px;border-top:1px solid #e5edf4;flex-wrap:wrap}.explanation{background:white;border:1px solid #dce6ef;border-radius:14px;padding:16px 20px;margin-top:18px}.explanation h3{margin:0 0 8px}.explanation p{white-space:pre-wrap;margin:0;line-height:1.7}@media(max-width:800px){header{align-items:flex-start;flex-direction:column}header h1{font-size:21px}.workspace{grid-template-columns:1fr}textarea,pre{min-height:270px}main{padding:15px 12px}}

/* v1.0.4: keep labels legible in independent fullscreen template */
header h1, .panel-head strong, .explanation h3 { visibility:visible; opacity:1; }
button, .header-actions a { font-size:14px; }

.ril-version{padding:12px 30px;text-align:right;color:#52687c;font-size:12px}
header h1,.panel-head strong,.explanation h3,#run-code,.header-actions a{font-size:revert;letter-spacing:normal;text-indent:0;white-space:normal}

/* v1.0.6 editorial polish and editable syntax highlighting */
:root{font-family:system-ui,-apple-system,"Noto Sans TC",sans-serif;background:#f3f7fb;color:#172f47}
header{box-shadow:0 3px 18px #102c4522;padding-block:22px}header h1{font-size:clamp(22px,2vw,29px)!important;font-weight:750;letter-spacing:.03em}
main{padding-top:32px}.intro h2{font-size:23px;color:#173b5b}.intro p{line-height:1.75}
.panel,.explanation{border-color:#d8e5ef;box-shadow:0 5px 22px #173c5c0a;border-radius:15px}.panel-head{padding:15px 18px;background:#fff}.panel-head strong{font-size:16px!important;color:#123a58;font-weight:750}.toolbar{padding:14px 18px;background:#fff}
button{transition:background .15s,border-color .15s,transform .15s;font-weight:600}button:hover:not(:disabled){border-color:#0879ac;background:#edf7fd}button.primary:hover:not(:disabled),nav button.active:hover{background:#075987;color:white}
.editor-shell{position:relative;display:flex;min-height:440px;background:#f9fbfe;overflow:hidden;flex:1}
#code-lines{flex:0 0 46px;text-align:right;padding:18px 11px 18px 3px;background:#eff4fa;color:#8093a6;white-space:pre;font:14px/1.7 Consolas,monospace;overflow:hidden;user-select:none;border-right:1px solid #dfe9f2}
.editor-stack{position:relative;flex:1;min-width:0;min-height:440px}
#code-highlight,#r-code{position:absolute;inset:0;width:100%;height:100%;min-height:0;margin:0;padding:18px;border:0;border-radius:0;overflow:auto;white-space:pre;overflow-wrap:normal;word-break:normal;font:14px/1.7 Consolas,Monaco,monospace;letter-spacing:0;tab-size:2}
#code-highlight{z-index:1;pointer-events:none;color:#24425c;background:transparent}
#r-code{z-index:2;resize:none;background:transparent;color:transparent;-webkit-text-fill-color:transparent;caret-color:#163e60}
#r-code::selection{background:#9fcdf880;-webkit-text-fill-color:transparent}
.tok-comment{color:#708a80;font-style:italic}.tok-string{color:#b45d32}.tok-number{color:#9154bb}.tok-keyword{color:#ae4777;font-weight:700}.tok-function{color:#0873a5;font-weight:600}
#r-output{background:#fcfdff;min-height:220px}#plots{padding:14px 18px}#plots img{background:white;border-radius:10px;box-shadow:0 3px 12px #123b6915}
.ril-version{padding:16px 32px;font-weight:650;color:#557089}
@media(max-width:800px){.editor-shell,.editor-stack{min-height:320px}header{padding:17px 16px}.panel-head{padding:12px}}

/* v1.1.0 teaching library and front-end management */
.ril-library{background:#fff;border:1px solid #dce5ee;border-radius:16px;padding:18px 20px;margin-bottom:18px;box-shadow:0 6px 24px rgba(15,43,70,.045)}
.library-head,.manage-head{display:flex;align-items:center;justify-content:space-between;gap:12px}.library-head strong{font-size:18px;color:#153956}.library-head small{display:block;color:#64748b;margin-top:3px}.library-head button,.manage-head button,.manage-actions button{background:#0b6eaa;color:#fff;border:0;border-radius:9px;padding:9px 15px;cursor:pointer}
.chapter-list{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:12px;margin-top:14px}.ril-chapter{border:1px solid #d9e5ef;border-radius:11px;padding:10px 12px;background:#f7fbff}.ril-chapter summary{cursor:pointer;font-weight:700;color:#153956}.library-method{margin:10px 0 2px;padding:9px;background:white;border-radius:8px}.library-method strong{display:block;font-size:13px;margin-bottom:5px}.ril-ex{display:block;width:100%;text-align:left;background:#e9f4fb;color:#12547d;border:0;border-radius:7px;padding:8px;margin:5px 0;cursor:pointer}.ril-ex:hover{background:#d3e9f8}
#ril-management{background:#fff;border:1px solid #c8d9e8;border-radius:16px;padding:20px;margin-bottom:18px}#ril-management[hidden],#mf-details[hidden],#mf-chapter-wrap[hidden],#mf-method-wrap[hidden]{display:none!important}.manage-items{max-height:280px;overflow:auto;border:1px solid #e2e8f0;border-radius:9px}.manage-item{display:flex;justify-content:space-between;align-items:center;gap:12px;padding:9px 12px;border-bottom:1px solid #e2e8f0}.manage-item button{margin-left:6px;border:1px solid #bcd0df;border-radius:7px;padding:5px 9px;background:#fff;cursor:pointer}.manage-form{margin-top:18px;background:#f6f9fc;border:1px solid #dce5ed;padding:16px;border-radius:12px}.manage-form label{display:block;font-weight:600;font-size:13px;margin:12px 0}.manage-form input:not([type=checkbox]),.manage-form select,.manage-form textarea{display:block;box-sizing:border-box;width:100%;border:1px solid #c8d5e1;border-radius:7px;padding:10px;background:#fff;margin-top:5px;font:inherit}.manage-form textarea{min-height:90px}.manage-form #mf-code{min-height:180px;font:13px/1.6 monospace}.manage-form label.check{display:flex;gap:8px;align-items:center}.manage-actions{display:flex;gap:10px;margin-top:12px}.library-empty{color:#64748b}
@media(max-width:650px){.ril-library,#ril-management{padding:12px}.manage-item{align-items:flex-start;flex-direction:column}.chapter-list{grid-template-columns:1fr}}
/* v1.2.0 — readable academic blue UI, two-level cards, drag-and-drop ordering */
:root{color-scheme:light;background:#f3f7fc;color:#18344f}body{background:#f3f7fc;color:#18344f}
header{background:linear-gradient(115deg,#123052 0%,#125786 70%,#147f9f 100%);color:#fff}header h1{color:#fff!important;text-shadow:0 1px 2px #0a294055}#engine-status{color:#e8f8ff}
main{max-width:1600px}.ril-library{border:1px solid #d5e2ed;background:#fff;box-shadow:0 12px 32px #1639560c;padding:22px}.library-head strong{font-size:20px;color:#143e61}.library-head small{color:#526e84}.method-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:14px;margin-top:18px}.method-card{border:1px solid #d6e4f0;border-radius:14px;padding:16px;background:linear-gradient(180deg,#f2f8fe 0%,#fff 45%);min-width:0}.method-card h3{font-size:17px;color:#174d73;margin:0 0 12px;border-left:4px solid #1289ad;padding-left:10px}.example-list{display:grid;gap:8px}.ril-ex{margin:0;text-align:left;background:#fff;color:#185479;border:1px solid #d4e5f1;border-radius:9px;font-weight:600;padding:11px 12px}.ril-ex:hover{background:#e8f5fc;color:#0d567b;border-color:#8cc7e1}
.intro{background:#fff;border:1px solid #dce8f1;border-radius:12px;padding:18px 20px}.intro h2{color:#153d5d}.intro p{color:#49657d}.panel{background:#fff}.panel-head{background:#f8fbfe}.panel-head strong{color:#123e5e}.explanation{background:#fff}.explanation h3{color:#174363}.explanation p{color:#314f68}button:focus-visible,.ril-ex:focus-visible{outline:3px solid #5bb6d7;outline-offset:2px}
#ril-management{background:#fff;box-shadow:0 10px 30px #123a5810}.manage-head p{margin:5px 0 0;color:#526d84;font-size:13px}.manage-groups{display:grid;gap:12px;margin-top:18px}.manage-group{border:1px solid #d7e4ef;border-radius:12px;background:#f8fbfe;padding:10px}.manage-item{background:#fff;border:1px solid #e1eaf2;border-radius:9px;margin-bottom:5px;display:flex;gap:10px;align-items:center;min-height:48px;padding:8px 10px;cursor:grab}.manage-item.child{background:#fff}.manage-children{margin:8px 0 8px 24px}.manage-item strong{color:#143e60}.manage-item small{color:#61778b;white-space:nowrap}.drag-handle{font-size:24px;color:#527c99;cursor:grab;line-height:1;user-select:none}.manage-item.dragging{opacity:.4}.manage-item.drag-over{border:2px dashed #1584b0;background:#e5f5fd}.item-actions{margin-left:auto;display:flex;gap:5px}.manage-item button{margin:0}.add-example{margin-left:24px;background:#e9f4fc;border:1px solid #bbdcec;color:#155e85;padding:8px 12px}.manage-form{background:#f5f9fd}.manage-form input,.manage-form textarea,.manage-form select{color:#163d5a!important}.manage-actions button{background:#116f9e;color:#fff}
@media(max-width:650px){.method-grid{grid-template-columns:1fr}.ril-library{padding:14px}.manage-children{margin-left:10px}.manage-item{flex-wrap:wrap}.item-actions{margin-left:0}.manage-head{align-items:flex-start;flex-wrap:wrap}}


/* v1.2.1: high contrast buttons, dark R editor and top-aligned results */
.workspace{align-items:start}
.workspace>.panel{align-self:start;min-height:0}
.workspace>.panel:nth-child(2) #r-output{
  flex:0 0 auto!important;min-height:0!important;height:auto!important;
  padding:12px 18px;white-space:pre-wrap;overflow-wrap:anywhere;
  background:#fff;color:#253d52;font:13px/1.6 ui-monospace,Consolas,monospace;
}
#plots{flex:0 0 auto;padding:4px 18px 14px;gap:12px;align-items:flex-start}
#plots:empty{display:none}
#plots img,#plots canvas{display:block;max-width:100%;width:auto;height:auto;object-fit:contain;border:1px solid #dce6ef;border-radius:9px;background:#fff}
.editor-shell{background:#101b2b;min-height:320px;flex:0 0 auto;height:clamp(320px,38vh,480px)}
.editor-stack{min-height:0;height:100%;background:#101b2b}
#code-lines{background:#0b1422;color:#7f92ad;border-right:1px solid #2a3a50}
#code-highlight{background:transparent!important;color:#e2e8f0!important;flex:none!important}
#r-code{background:transparent!important;color:transparent!important;-webkit-text-fill-color:transparent!important;caret-color:#f8fafc}
#r-code::selection{background:#245b88aa}
.tok-comment{color:#91aa9b}.tok-string{color:#fbbf24}.tok-number{color:#c4b5fd}.tok-keyword{color:#f9a8d4}.tok-function{color:#67e8f9}
/* Always maintain readable foreground against hover backgrounds, including nested management controls */
button:not(:disabled):hover,button:not(:disabled):focus-visible{background:#e4f3fc;color:#124c70;border-color:#77b8d6}
button.primary:not(:disabled),.library-head button,.manage-head button,.manage-actions button{background:#096d9f;color:#fff;border-color:#096d9f}
button.primary:not(:disabled):hover,button.primary:not(:disabled):focus-visible,
.library-head button:not(:disabled):hover,.library-head button:not(:disabled):focus-visible,
.manage-head button:not(:disabled):hover,.manage-head button:not(:disabled):focus-visible,
.manage-actions button:not(:disabled):hover,.manage-actions button:not(:disabled):focus-visible{background:#07517b!important;color:#fff!important;border-color:#07517b!important}
.method-card .ril-ex:hover,.method-card .ril-ex:focus-visible{background:#d9eefb!important;color:#103e61!important;border-color:#78b7d6!important}
.manage-item button:not(:disabled):hover,.manage-item button:not(:disabled):focus-visible{background:#e4f3fc!important;color:#124c70!important;border-color:#77b8d6!important}
.add-example:not(:disabled):hover,.add-example:not(:disabled):focus-visible{background:#d7ecfb!important;color:#124c70!important}
.header-actions a:hover,.header-actions a:focus-visible{background:#ffffff24;color:#fff;border-color:#fff}
@media(max-width:800px){.editor-shell{height:340px;min-height:300px}.workspace{align-items:stretch}#r-output{font-size:12px}}

/* v1.3.0 independent taxonomy and analysis-example controls */
.manage-head-actions{display:flex;gap:9px;flex-wrap:wrap}.method-description{font-size:13px;line-height:1.7;color:#526d84;margin:0 0 12px}.form-tip{font-size:13px;color:#526d84}.manage-group>strong{display:block;padding:10px}.manage-head-actions button:hover{background:#07517b!important;color:#fff!important}
@media(max-width:650px){.manage-head-actions{width:100%}.manage-head-actions button{flex:1}}

/* v1.3.1: center only the main title; keep status and home link at right */
header{display:grid!important;grid-template-columns:minmax(0,1fr) auto minmax(0,1fr);align-items:center;gap:12px}
header>div:first-child{grid-column:2;min-width:0;text-align:center}
header #ril-main-title{margin:0!important;text-align:center!important;color:#fff!important}
header .header-actions{grid-column:3;justify-self:end;justify-content:flex-end}
@media(max-width:800px){header{grid-template-columns:minmax(0,1fr);gap:12px}header>div:first-child{grid-column:1;width:100%}header .header-actions{grid-column:1;justify-self:center;justify-content:center;width:100%}}