/* simulator.css — universal simulator page + A4 print report */

.sim-wrap{background:var(--bg-2)}
.sim-top{background:#fff;border-bottom:1px solid var(--line)}
.sim-top .container{padding:24px 20px}
.sim-top h1{font-size:26px;margin:6px 0 4px}
.sim-top .concept{color:var(--ink-2);max-width:820px}

/* ===== Simple Notes study card (every simulator) ===== */
#panel-notes h2 .note-sub{font-size:12px;font-weight:600;color:var(--muted)}
.note-block{margin-bottom:12px}
.note-block:last-child{margin-bottom:0}
.note-tag{display:inline-block;font-size:11px;font-weight:800;letter-spacing:.4px;
  padding:3px 10px;border-radius:999px;margin-bottom:6px}
.note-def{background:#eff6ff;color:#1d4ed8}
.note-key{background:#f0fdf4;color:#166534}
.note-warn{background:#fffbeb;color:#b45309}
.note-block p{margin:0;font-size:14.5px;line-height:1.6;color:var(--ink-2)}
.note-block ul{margin:4px 0 0;padding-left:20px}
.note-block li{font-size:14px;line-height:1.55;color:var(--ink-2);margin-bottom:4px}

/* "What you'll learn" explainer card in the header (every simulator) */
.sim-about{display:flex;gap:12px;align-items:flex-start;background:var(--grad-soft);
  border:1px solid var(--line);border-radius:14px;padding:13px 16px;max-width:860px;margin-top:10px}
.sim-about-ico{font-size:22px;line-height:1.2}
.sim-about-label{display:block;font-size:11px;font-weight:800;text-transform:uppercase;
  letter-spacing:.6px;color:var(--brand1);margin-bottom:3px}
.sim-about .concept{margin:0;font-size:14.5px;line-height:1.6}

.sim-grid{display:grid;grid-template-columns:360px 1fr;gap:22px;padding:24px 0;align-items:start}

.panel{background:#fff;border:1px solid var(--line);border-radius:16px;padding:20px;box-shadow:var(--shadow);margin-bottom:20px}
.panel h2{font-size:16px;margin:0 0 12px;display:flex;align-items:center;gap:8px}
.panel h2 .n{width:24px;height:24px;border-radius:7px;background:var(--grad);color:#fff;font-size:12px;
  display:grid;place-items:center;font-weight:800}

.field{margin-bottom:14px}
.field label{display:block;font-weight:600;font-size:13px;margin-bottom:5px;color:var(--ink-2)}
.field .help{font-size:12px;color:var(--muted);margin-top:4px}
.field input,.field textarea,.field select{font-size:14px}
.btn-row{display:flex;gap:10px;flex-wrap:wrap;margin-top:6px}

/* sticky input on desktop */
.sim-input-col{position:sticky;top:84px}

/* visual output */
.viz{min-height:80px;padding:6px 0}
.viz-empty{color:var(--muted);text-align:center;padding:30px;border:1px dashed var(--line);border-radius:12px}

/* Gantt chart */
.gantt{display:flex;flex-wrap:wrap;gap:0;margin:10px 0}
.gantt .blk{min-width:46px;text-align:center;border:1px solid var(--brand2);border-right:0;
  background:var(--grad-soft);font-weight:700;padding:10px 4px;position:relative}
.gantt .blk:last-child{border-right:1px solid var(--brand2)}
.gantt .blk .t0{position:absolute;left:-2px;bottom:-20px;font-size:11px;color:var(--muted);font-weight:600}
.gantt .blk .t1{position:absolute;right:-6px;bottom:-20px;font-size:11px;color:var(--muted);font-weight:600}
.gantt-wrap{padding-bottom:24px}

/* memory frames / boxes */
.boxrow{display:flex;gap:8px;flex-wrap:wrap;margin:8px 0;align-items:flex-end}
.box{min-width:46px;height:46px;border:2px solid var(--brand2);border-radius:8px;display:grid;
  place-items:center;font-weight:700;background:#fff;position:relative}
.box.hit{border-color:var(--green);background:var(--green-bg)}
.box.miss{border-color:var(--red);background:#fef2f2}
.box .idx{position:absolute;bottom:-18px;left:0;right:0;text-align:center;font-size:11px;color:var(--muted)}
.box.ptr{border-style:dashed}
.box-label{font-size:12px;color:var(--muted);margin-right:6px;align-self:center}

/* node / pointer arrows for linked lists */
.nodes{display:flex;align-items:center;gap:0;flex-wrap:wrap}
.node{display:flex;border:2px solid var(--brand1);border-radius:8px;overflow:hidden}
.node .data{padding:10px 12px;font-weight:700}
.node .next{padding:10px 8px;background:var(--grad-soft);font-size:12px;color:var(--brand1)}
.arrow{padding:0 8px;color:var(--muted);font-weight:800}

/* steps */
.steps-list{counter-reset:s;list-style:none;padding:0;margin:0}
.steps-list li{position:relative;padding:10px 12px 10px 44px;border:1px solid var(--line);
  border-radius:10px;margin-bottom:8px;background:#fff;font-size:14px}
.steps-list li::before{counter-increment:s;content:counter(s);position:absolute;left:10px;top:50%;
  transform:translateY(-50%);width:24px;height:24px;border-radius:7px;background:var(--grad-soft);
  color:var(--brand1);font-weight:800;display:grid;place-items:center;font-size:12px}

/* common mistakes / exam format */
.mistakes li{color:var(--ink-2);margin-bottom:6px}
.exam-box{background:var(--green-bg);border:1px solid #bbf7d0;border-radius:12px;padding:16px;
  font-size:14px;white-space:pre-wrap;line-height:1.7}
.exam-box code{background:#fff;padding:1px 6px;border-radius:5px}

/* preview iframe (web sims) */
.preview-frame{width:100%;min-height:240px;border:1px solid var(--line);border-radius:10px;background:#fff}

.kv{display:grid;grid-template-columns:auto 1fr;gap:4px 14px;font-size:14px}
.kv .k{color:var(--muted)}
.tag-soft{display:inline-block;background:var(--bg-2);border:1px solid var(--line);border-radius:7px;
  padding:2px 8px;font-size:12px;font-family:monospace;margin:2px}

.result-hidden{display:none}

/* ===== A4 print report ===== */
@media print{
  .navbar,.site-footer,.sim-input-col,.no-print,.nav-toggle{display:none !important}
  body{background:#fff}
  .sim-grid{display:block;padding:0}
  .panel{box-shadow:none;border:1px solid #ccc;break-inside:avoid}
  .sim-top{border:none}
  .print-only{display:block !important}
}
.print-only{display:none}

@media (max-width:880px){
  .sim-grid{grid-template-columns:1fr}
  .sim-input-col{position:static}
}

/* ===== Animated step player ===== */
.player-bar{display:flex;align-items:center;gap:8px;flex-wrap:wrap;background:var(--bg-2);
  border:1px solid var(--line);border-radius:12px;padding:8px 10px;margin-bottom:14px}
.pbtn{width:34px;height:34px;border:1px solid var(--line);background:#fff;border-radius:9px;
  cursor:pointer;font-size:14px;display:grid;place-items:center;transition:.15s}
.pbtn:hover{border-color:var(--brand2);transform:translateY(-1px)}
.pbtn-main{background:var(--grad);color:#fff;border:0;width:40px;height:40px;font-size:16px;
  box-shadow:0 6px 16px rgba(124,58,237,.3)}
.player-count{font-size:13px;font-weight:700;color:var(--ink-2);min-width:92px}
.player-spacer{flex:1}
.player-speed{font-size:12px;color:var(--muted);display:flex;align-items:center;gap:6px}
.player-speed select{width:auto;padding:4px 6px;font-size:12px}
.player-track{width:100%;height:6px;background:#e6e8f0;border-radius:99px;overflow:hidden;margin-top:2px}
.player-track > span{display:block;height:100%;width:0;background:var(--grad);transition:width .35s ease}

/* step reveal states */
.steps-list li.step-row{opacity:.32;transition:opacity .35s ease,background .35s,box-shadow .3s,transform .25s}
.steps-list li.step-row.seen{opacity:1}
.steps-list li.step-row.active{background:var(--grad-soft);box-shadow:0 0 0 2px rgba(124,58,237,.35);
  transform:translateX(3px)}
.steps-list li.step-row.active::before{background:var(--grad);color:#fff;animation:stepPulse .6s ease}
@keyframes stepPulse{0%{transform:translateY(-50%) scale(.6)}60%{transform:translateY(-50%) scale(1.15)}100%{transform:translateY(-50%) scale(1)}}

/* visual element entrance (Gantt blocks, frames, nodes, columns) */
.anim-item{opacity:0;transform:translateY(8px) scale(.94);
  transition:opacity .4s ease,transform .4s cubic-bezier(.2,.8,.2,1)}
.anim-item.show{opacity:1;transform:none}

/* ===== C program code + output blocks ===== */
.cprog{display:grid;gap:12px}
.code-block,.out-block{border:1px solid var(--line);border-radius:10px;overflow:hidden}
.code-block .cap,.out-block .cap{background:var(--bg-2);padding:6px 12px;font-size:12px;
  font-weight:700;color:var(--muted);border-bottom:1px solid var(--line)}
.code-block pre,.out-block pre{margin:0;padding:12px;font-family:'Consolas','Courier New',monospace;
  font-size:13px;overflow-x:auto;white-space:pre;line-height:1.5}
.out-block pre{background:#0b1020;color:#a7f3d0}

/* pattern output (each row is an animatable child) */
.pat{font-family:'Consolas','Courier New',monospace;font-size:16px;line-height:1.5;
  background:#0b1020;color:#a7f3d0;padding:16px;border-radius:10px;display:inline-block;min-width:50%}
.pat-row{white-space:pre;letter-spacing:1px}

/* ===== explainer-card panels: code / variables / how-to-run ===== */
.ccode{background:#0b1020;color:#e2e8f0;padding:14px 16px;border-radius:10px;
  font-family:'Consolas','Courier New',monospace;font-size:13px;white-space:pre;
  overflow-x:auto;line-height:1.65;margin:0}
.varlist{display:grid;gap:8px}
.var-item{display:flex;gap:12px;align-items:baseline;padding:9px 12px;
  border:1px solid var(--line);border-radius:9px;background:#fff}
.var-name{font-family:'Consolas',monospace;font-weight:700;color:var(--brand1);
  min-width:64px;background:var(--grad-soft);padding:2px 8px;border-radius:6px;text-align:center}
.var-role{color:var(--ink-2);font-size:14px}
.howto{margin:0;padding-left:22px}
.howto li{margin-bottom:9px;color:var(--ink-2)}
.howto code{background:#0b1020;color:#a7f3d0;padding:2px 8px;border-radius:6px;
  font-family:'Consolas',monospace;font-size:13px}

/* ===== global diagram + table entrance animations (all simulators) ===== */
.viz-anim{animation:vizIn .5s cubic-bezier(.2,.8,.2,1) both}
@keyframes vizIn{from{opacity:0;transform:translateY(12px) scale(.985)}to{opacity:1;transform:none}}

#sim-calc table tbody tr.row-anim,#sim-viz table tbody tr.row-anim{
  animation:rowIn .42s cubic-bezier(.2,.8,.2,1) both;animation-delay:var(--rd,0ms)}
@keyframes rowIn{from{opacity:0;transform:translateX(-10px)}to{opacity:1;transform:none}}

/* richer motion for visual primitives (skip .anim-item: the step player
   reveals those progressively, so we must not force them visible here) */
.viz-anim .gantt .blk:not(.anim-item){animation:popIn .4s ease both}
.viz-anim .boxrow .box:not(.anim-item){animation:popIn .4s ease both}
.viz-anim .nodes .node:not(.anim-item){animation:slideRight .45s cubic-bezier(.2,.8,.2,1) both}
.viz-anim .exam-box,.viz-anim .out-block,.viz-anim pre{animation:vizIn .55s ease both}
@keyframes popIn{0%{opacity:0;transform:scale(.6)}60%{transform:scale(1.08)}100%{opacity:1;transform:scale(1)}}
@keyframes slideRight{from{opacity:0;transform:translateX(-14px)}to{opacity:1;transform:none}}

/* gentle interactivity on diagram pieces */
.box,.node{transition:transform .15s ease,box-shadow .15s ease}
.box:hover,.node:hover{transform:translateY(-3px);box-shadow:0 8px 18px rgba(124,58,237,.18)}
.gantt .blk{transition:transform .15s ease}
.gantt .blk:hover{transform:translateY(-2px)}

/* respect reduced-motion preference */
@media (prefers-reduced-motion:reduce){
  .viz-anim,.viz-anim *,#sim-calc tr.row-anim,#sim-viz tr.row-anim{animation:none !important}
}

/* keep everything visible in print / fallback */
@media print{
  .steps-list li.step-row{opacity:1 !important;background:none !important;box-shadow:none !important;transform:none !important}
  .anim-item{opacity:1 !important;transform:none !important}
}

/* ===== Copy & Export bar ===== */
.copy-export-bar{flex-wrap:wrap;gap:8px}
.copy-export-bar .btn{gap:5px}
.copy-code-btn{font-size:11px !important;padding:3px 9px !important;border-radius:7px !important;margin-left:auto}

/* ===== Practice / Exam Mode ===== */
body.exam-mode .sim-wrap .sim-top{border-bottom:3px solid var(--amber) !important}
.exam-hidden-msg{display:flex;align-items:center;gap:14px;flex-wrap:wrap;
  background:#fffbeb;border:1px solid #fde68a;border-radius:12px;padding:16px 18px}
.exam-hidden-msg span{color:var(--amber);font-weight:600;font-size:14px;flex:1}
body.exam-mode #btnExamMode{background:var(--amber)!important;color:#fff!important;border-color:var(--amber)!important}

/* ===== History panel ===== */
.hist-list{display:flex;flex-direction:column;gap:8px}
.hist-item{display:flex;align-items:center;gap:10px;padding:10px 12px;
  border:1px solid var(--line);border-radius:10px;background:#fff;flex-wrap:wrap}
.hist-meta{flex:1;min-width:0;display:flex;flex-direction:column;gap:3px}
.hist-date{font-size:11px;color:var(--muted);font-weight:600}
.hist-inp{font-size:12px;color:var(--ink-2);font-family:monospace;
  white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.hist-sum{font-size:12px;color:var(--green);font-weight:600}
.hist-rerun{flex:none}

/* ===== Prev / Next navigation bar ===== */
.sim-nav-bar{padding:20px 20px 0}
.sim-nav{display:flex;gap:12px;justify-content:space-between;flex-wrap:wrap}
.sim-nav-prev,.sim-nav-next{display:flex;align-items:center;gap:10px;
  padding:14px 18px;border:1px solid var(--line);border-radius:14px;
  background:#fff;text-decoration:none;color:var(--ink);
  transition:.15s border-color,.15s box-shadow;max-width:calc(50% - 6px);flex:1}
.sim-nav-prev:hover,.sim-nav-next:hover{border-color:var(--brand1);
  box-shadow:0 4px 16px rgba(124,58,237,.12);text-decoration:none}
.sim-nav-next{justify-content:flex-end;text-align:right}
.sim-nav-arr{font-size:22px;font-weight:700;color:var(--brand1);flex:none}
.sim-nav-lbl{display:block;font-size:11px;font-weight:700;text-transform:uppercase;
  letter-spacing:.6px;color:var(--muted)}
.sim-nav-name{display:block;font-size:14px;font-weight:600;color:var(--ink);
  white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:260px}

/* ===== Related Simulators grid ===== */
.related-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:12px;margin-top:4px}
.related-card{display:flex;flex-direction:column;gap:6px;
  padding:14px 16px;border:1px solid var(--line);border-radius:12px;
  background:var(--bg-2);text-decoration:none;color:var(--ink);
  transition:.15s border-color,.15s background}
.related-card:hover{border-color:var(--brand1);background:#f5f3ff;text-decoration:none}
.related-code{font-family:monospace;font-size:12px;font-weight:700;color:var(--brand1)}
.related-name{font-size:14px;font-weight:600;color:var(--ink);line-height:1.35}

/* ===== Mobile table scroll (accessibility) ===== */
.table-wrap{overflow-x:auto;-webkit-overflow-scrolling:touch;border-radius:12px}

/* ===== Tooltips ===== */
[data-tooltip]{position:relative;cursor:help}
[data-tooltip]::after{content:attr(data-tooltip);position:absolute;bottom:calc(100% + 6px);
  left:50%;transform:translateX(-50%);background:#0f172a;color:#fff;
  font-size:12px;padding:4px 8px;border-radius:7px;white-space:nowrap;
  pointer-events:none;opacity:0;transition:opacity .15s;z-index:100}
[data-tooltip]:hover::after{opacity:1}

/* ===== Responsive adjustments ===== */
@media(max-width:600px){
  .sim-nav-prev,.sim-nav-next{max-width:100%;flex:1 1 100%}
  .sim-nav-name{max-width:100%}
  .related-grid{grid-template-columns:1fr 1fr}
  .copy-export-bar{gap:6px}
}

/* ---- C++ Programming Lab: pattern / program output ---- */
.pat-grid{
  font-family:"Cascadia Code","Fira Code",Consolas,"Courier New",monospace;
  font-size:15px; line-height:1.5; white-space:pre;
  background:#0b1220; color:#e6edf7;
  border:1px solid #1e2a44; border-radius:10px;
  padding:14px 16px; margin:8px 0; overflow:auto;
  letter-spacing:1px; tab-size:4;
}
#sim-viz .dbg-arr-row{margin:4px 0 12px}
#sim-viz .dbg-arr-cell{background:#0e1830;color:#e6edf7;transition:background .2s}
#sim-viz .dbg-arr-cell.cmp{background:#3a2d63;border-color:#7c5cff!important}
#sim-viz .dbg-arr-cell.swap{background:#5a4a17;border-color:#f4c542!important}
#sim-viz .dbg-arr-cell.done{background:#1d4d33;border-color:#37c871!important}