*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}

/* ══ THEMES ══════════════════════════════════════════ */
.theme-dark{
  --bg:#080808;--s1:#0f0f0f;--s2:#161616;--s3:#1e1e1e;
  --b1:rgba(255,255,255,.06);--b2:rgba(255,255,255,.11);--b3:rgba(255,255,255,.20);
  --t1:#f0f0f0;--t2:#888;--t3:#3a3a3a;
  --accent:#b8ff57;--accent-dim:rgba(184,255,87,.12);--accent-dim2:rgba(184,255,87,.06);
  --red:#ff5555;--blue:#7eb8ff;--green:#57ff8a;--orange:#f5a524;
  --shadow:rgba(0,0,0,.5);
}
.theme-light{
  --bg:#f4f4f2;--s1:#eaeae8;--s2:#e2e2e0;--s3:#d8d8d6;
  --b1:rgba(0,0,0,.07);--b2:rgba(0,0,0,.13);--b3:rgba(0,0,0,.22);
  --t1:#111;--t2:#666;--t3:#bbb;
  --accent:#5a9e00;--accent-dim:rgba(90,158,0,.10);--accent-dim2:rgba(90,158,0,.05);
  --red:#cc2222;--blue:#1a6aff;--green:#118844;--orange:#b07000;
  --shadow:rgba(0,0,0,.15);
}
.theme-high{
  --bg:#000;--s1:#0a0a0a;--s2:#111;--s3:#1a1a1a;
  --b1:rgba(255,255,255,.12);--b2:rgba(255,255,255,.22);--b3:rgba(255,255,255,.35);
  --t1:#fff;--t2:#aaa;--t3:#555;
  --accent:#00ffcc;--accent-dim:rgba(0,255,204,.10);--accent-dim2:rgba(0,255,204,.05);
  --red:#ff4444;--blue:#44aaff;--green:#44ff88;--orange:#ffaa44;
  --shadow:rgba(0,0,0,.6);
}

html,body{height:100%;overflow:hidden;background:var(--bg);color:var(--t1);font-family:'Geist',sans-serif;transition:background .25s,color .25s}

/* ══ ANIMATIONS ══════════════════════════════════════ */
@keyframes fadeIn  {from{opacity:0}to{opacity:1}}
@keyframes slideUp {from{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}
@keyframes pulse   {0%,100%{opacity:1}50%{opacity:.3}}
@keyframes spin    {to{transform:rotate(360deg)}}
@keyframes blink   {0%,49%{opacity:1}50%,100%{opacity:0}}
@keyframes accentBar{from{width:0}to{width:100%}}
@keyframes popIn   {0%{opacity:0;transform:scale(.94)}100%{opacity:1;transform:scale(1)}}

/* ══ APP SHELL ═══════════════════════════════════════ */
.app{display:grid;grid-template-rows:52px 40px 1fr auto;height:100vh;animation:fadeIn .3s ease}

/* ══ HEADER ══════════════════════════════════════════ */
header{display:flex;align-items:center;padding:0 16px;gap:10px;border-bottom:1px solid var(--b1);background:var(--bg);position:relative;z-index:20}
header::after{content:'';position:absolute;bottom:-1px;left:0;height:1px;background:linear-gradient(90deg,var(--accent),transparent 60%);animation:accentBar 1s cubic-bezier(.16,1,.3,1) .1s both}
.logo{font-family:'Geist Mono',monospace;font-size:14px;font-weight:600;display:flex;align-items:center;gap:8px;letter-spacing:-.3px;flex-shrink:0;color:var(--t1)}
.logo-dot{width:8px;height:8px;border-radius:50%;background:var(--accent);animation:pulse 2.5s infinite;box-shadow:0 0 10px var(--accent)}
.logo-img{width:24px;height:24px;object-fit:contain;mix-blend-mode:screen}
.hdr-center{flex:1;display:flex;align-items:center;justify-content:center}
.hdr-right{display:flex;align-items:center;gap:5px}
.hdr-btn{font-family:'Geist Mono',monospace;font-size:10px;color:var(--t2);background:transparent;border:1px solid var(--b1);border-radius:6px;padding:4px 9px;cursor:pointer;transition:color .15s,border-color .15s,background .15s;white-space:nowrap}
.hdr-btn:hover{color:var(--t1);border-color:var(--b2);background:var(--s2)}
.py-badge{font-family:'Geist Mono',monospace;font-size:10px;padding:4px 10px;border-radius:999px;border:1px solid var(--b1);color:var(--t3);white-space:nowrap;transition:all .4s}
.py-badge.ready{color:var(--accent);border-color:rgba(184,255,87,.3);box-shadow:0 0 8px rgba(184,255,87,.1)}

/* Complexity badges */
.complexity-bar{display:flex;gap:6px;align-items:center;animation:fadeIn .3s ease}
.cx-badge{font-family:'Geist Mono',monospace;font-size:10px;padding:3px 10px;border-radius:999px;font-weight:500}
.cx-time{background:rgba(126,184,255,.12);color:var(--blue);border:1px solid rgba(126,184,255,.2)}
.cx-space{background:rgba(87,255,138,.08);color:var(--green);border:1px solid rgba(87,255,138,.15)}

/* ══ TAB BAR ══════════════════════════════════════════ */
.tabbar{display:flex;align-items:center;border-bottom:1px solid var(--b1);background:var(--s1);overflow-x:auto;overflow-y:hidden;padding:0 10px;gap:2px;scrollbar-width:none}
.tabbar::-webkit-scrollbar{display:none}
.tab{display:flex;align-items:center;gap:6px;height:40px;padding:0 14px 0 12px;font-family:'Geist Mono',monospace;font-size:11px;color:var(--t2);cursor:pointer;border-bottom:2px solid transparent;white-space:nowrap;transition:color .15s,background .15s;user-select:none;position:relative;flex-shrink:0;margin-bottom:-1px;border-radius:4px 4px 0 0}
.tab:hover{color:var(--t1);background:var(--b1)}
.tab.active{color:var(--t1);border-bottom-color:var(--accent);background:var(--b1)}
.tab-ico{font-size:9px;opacity:.5}
.tab-nm{max-width:120px;overflow:hidden;text-overflow:ellipsis}
.tab-diff{width:6px;height:6px;border-radius:50%;flex-shrink:0}
.tab-diff.Easy{background:#57e87a}
.tab-diff.Medium{background:var(--orange)}
.tab-diff.Hard{background:var(--red)}
.tab-x{width:16px;height:16px;border-radius:3px;display:flex;align-items:center;justify-content:center;color:var(--t3);font-size:13px;transition:all .15s;flex-shrink:0}
.tab-x:hover{color:var(--red);background:rgba(255,85,85,.1)}
.tab-add{display:flex;align-items:center;justify-content:center;width:28px;height:28px;border-radius:6px;color:var(--t2);font-size:18px;cursor:pointer;transition:all .15s;flex-shrink:0;border:1px solid transparent;margin-left:4px}
.tab-add:hover{color:var(--accent);background:var(--accent-dim);border-color:rgba(184,255,87,.2)}

/* ══ WORKSPACE ════════════════════════════════════════ */
.workspace{display:flex;flex-direction:row;overflow:hidden;flex:1}

/* ══ CHAT SIDE ════════════════════════════════════════ */
.chat-side{display:flex;flex-direction:column;overflow:hidden;background:var(--bg);flex:1;min-width:280px}
.chat-hdr{display:flex;align-items:center;gap:8px;padding:0 14px;height:46px;border-bottom:1px solid var(--b1);flex-shrink:0;background:var(--s1)}
.chat-hdr-title{font-size:12px;font-weight:600;color:var(--t1);flex:1;letter-spacing:-.1px}
.clr-btn{font-family:'Geist Mono',monospace;font-size:10px;color:var(--t3);background:none;border:none;cursor:pointer;padding:3px 8px;border-radius:4px;transition:all .15s}
.clr-btn:hover{color:var(--red);background:rgba(255,85,85,.08)}

/* History bar */
.history-bar{border-bottom:1px solid var(--b1);background:var(--s1);flex-shrink:0;max-height:130px;overflow:hidden;transition:max-height .3s ease}
.history-bar.collapsed{max-height:32px}
.history-label{font-family:'Geist Mono',monospace;font-size:9px;letter-spacing:1.2px;text-transform:uppercase;color:var(--t3);padding:7px 14px 5px;cursor:pointer;user-select:none;display:flex;align-items:center;gap:6px}
.history-label::before{content:'▾';transition:transform .2s;font-size:10px}
.history-bar.collapsed .history-label::before{transform:rotate(-90deg)}
.history-filters{display:flex;gap:4px;margin-left:auto}
.hf-btn{font-family:'Geist Mono',monospace;font-size:9px;padding:1px 6px;border-radius:999px;cursor:pointer;border:1px solid var(--b1);color:var(--t3);transition:all .15s}
.hf-btn:hover,.hf-btn.active{color:var(--t1);background:var(--b1);border-color:var(--b2)}
.hf-btn.easy.active{color:#57e87a;border-color:rgba(87,232,122,.3);background:rgba(87,232,122,.08)}
.hf-btn.medium.active{color:var(--orange);border-color:rgba(245,165,36,.3);background:rgba(245,165,36,.08)}
.hf-btn.hard.active{color:var(--red);border-color:rgba(255,85,85,.3);background:rgba(255,85,85,.08)}
.history-list{display:flex;flex-direction:column;gap:2px;padding:0 8px 6px;overflow-y:auto;max-height:88px}
.history-item{font-size:11px;color:var(--t2);padding:5px 8px;border-radius:6px;cursor:pointer;transition:all .15s;display:flex;align-items:center;gap:6px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.history-item:hover{color:var(--t1);background:var(--s2)}
.hi-diff{font-family:'Geist Mono',monospace;font-size:9px;padding:1px 6px;border-radius:999px;flex-shrink:0}
.hi-diff.Easy{color:#57e87a;background:rgba(87,232,122,.08);border:1px solid rgba(87,232,122,.18)}
.hi-diff.Medium{color:var(--orange);background:rgba(245,165,36,.08);border:1px solid rgba(245,165,36,.18)}
.hi-diff.Hard{color:var(--red);background:rgba(255,85,85,.08);border:1px solid rgba(255,85,85,.18)}

/* Chat messages */
.chat-msgs{flex:1;overflow-y:auto;padding:16px 14px 8px;display:flex;flex-direction:column;gap:14px;scroll-behavior:smooth}
.chat-msgs::-webkit-scrollbar{width:3px}
.chat-msgs::-webkit-scrollbar-thumb{background:var(--b2);border-radius:2px}

/* Welcome screen */
.welcome{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:8px;padding:20px;text-align:center;animation:fadeIn .5s ease}
.wg{font-size:32px;opacity:.12;letter-spacing:-5px;margin-bottom:6px}
.wt{font-size:15px;font-weight:700;color:var(--t1);letter-spacing:-.3px}
.ws{font-size:12px;color:var(--t2);line-height:1.7;max-width:270px}
.welcome-chips{display:flex;flex-wrap:wrap;gap:6px;justify-content:center;margin-top:12px;max-width:320px}
.wchip{font-family:'Geist Mono',monospace;font-size:10px;color:var(--t2);background:var(--s1);border:1px solid var(--b1);border-radius:999px;padding:4px 12px;cursor:pointer;transition:all .15s}
.wchip:hover{color:var(--accent);border-color:rgba(184,255,87,.3);background:var(--accent-dim)}

/* Messages */
.msg{animation:slideUp .22s ease;display:flex;flex-direction:column;gap:4px}
.msg-lbl{font-family:'Geist Mono',monospace;font-size:9px;letter-spacing:.8px;text-transform:uppercase;color:var(--t3);padding:0 2px;display:flex;align-items:center;gap:6px}
.msg.user .msg-lbl{color:var(--accent);opacity:.8}
.msg-time{font-size:9px;color:var(--t3);margin-left:auto}
.msg-bbl{font-size:13px;line-height:1.8;color:var(--t1);background:var(--s2);border:1px solid var(--b1);border-radius:10px;padding:12px 14px;position:relative}
.msg.user .msg-bbl{background:var(--accent-dim2);border-color:rgba(184,255,87,.12);border-radius:10px 10px 4px 10px}
.theme-light .msg.user .msg-bbl{border-color:rgba(90,158,0,.15)}
.theme-high .msg.user .msg-bbl{border-color:rgba(0,255,204,.15)}

/* Code blocks in chat — with copy button */
.msg-bbl pre{font-family:'Geist Mono',monospace;font-size:12px;background:var(--s3);border:1px solid var(--b1);border-radius:8px;padding:14px;margin:10px 0;overflow-x:auto;white-space:pre;color:#c3e88d;line-height:1.65;position:relative}
.msg-bbl pre.streaming{border-style:dashed;opacity:.85}
.code-block-wrap{position:relative;margin:10px 0}
.code-block-wrap pre{margin:0}
.copy-code-btn{position:absolute;top:8px;right:8px;font-family:'Geist Mono',monospace;font-size:9px;padding:3px 8px;border-radius:4px;border:1px solid var(--b2);background:var(--s2);color:var(--t2);cursor:pointer;transition:all .15s;opacity:0}
.code-block-wrap:hover .copy-code-btn{opacity:1}
.copy-code-btn:hover{color:var(--accent);border-color:rgba(184,255,87,.3)}
.theme-light .msg-bbl pre{color:#2d7a00;background:#e8f5e8}
.theme-high .msg-bbl pre{color:#00ffcc}
.msg-bbl code{font-family:'Geist Mono',monospace;font-size:11.5px;background:var(--s3);padding:2px 6px;border-radius:4px;color:#c792ea;border:1px solid var(--b1)}
.theme-light .msg-bbl code{color:#7700cc;background:#f0e8ff}
.msg-bbl strong{color:var(--accent);font-weight:600}
.msg-bbl em{color:var(--t2)}
.msg-bbl hr{border:none;border-top:1px solid var(--b2);margin:10px 0}
.msg-bbl ul,.msg-bbl ol{padding-left:20px;margin:6px 0}
.msg-bbl li{margin-bottom:4px;line-height:1.7}
.msg-bbl h4{color:var(--accent);font-weight:600;margin:12px 0 5px;font-size:13px;letter-spacing:-.1px}


/* Load into editor buttons */
.load-btns-wrap{margin-top:18px;padding-top:14px;border-top:1px solid var(--b2);display:flex;flex-wrap:wrap;gap:6px}
.load-btn{display:inline-flex;align-items:center;gap:5px;padding:6px 14px;border-radius:6px;font-family:'Geist',sans-serif;font-size:11px;font-weight:500;cursor:pointer;border:1px solid rgba(184,255,87,.25);background:var(--accent-dim);color:var(--accent);transition:all .15s}
.load-btn:hover{background:rgba(184,255,87,.2);border-color:rgba(184,255,87,.4);transform:translateY(-1px)}
.load-btn:disabled{opacity:.45;cursor:not-allowed;transform:none}
.theme-light .load-btn{border-color:rgba(90,158,0,.3)}
.theme-high .load-btn{border-color:rgba(0,255,204,.3)}

/* AI disclaimer */
.ai-disclaimer{margin-top:12px;padding:6px 10px;border-radius:6px;font-family:'Geist Mono',monospace;font-size:10px;color:var(--t3);background:var(--s3);border:1px solid var(--b1);display:flex;align-items:center;gap:6px;line-height:1.5}
.ai-disclaimer i{font-size:11px;flex-shrink:0}

/* Typing indicator */
.tdots{display:flex;gap:5px;padding:4px 2px;align-items:center}
.td{width:5px;height:5px;border-radius:50%;background:var(--t3);animation:pulse 1.2s infinite}
.td:nth-child(2){animation-delay:.2s}
.td:nth-child(3){animation-delay:.4s}
.scursor::after{content:'▍';color:var(--accent);animation:blink .75s infinite;font-size:11px}

/* Quick chips */
.chips{display:flex;flex-wrap:wrap;gap:5px;padding:8px 12px;border-top:1px solid var(--b1);flex-shrink:0;max-height:68px;overflow-y:auto}
.chip{font-family:'Geist Mono',monospace;font-size:10px;color:var(--t2);background:var(--s1);border:1px solid var(--b1);border-radius:999px;padding:3px 11px;cursor:pointer;transition:all .15s;white-space:nowrap}
.chip:hover{color:var(--accent);border-color:rgba(184,255,87,.3);background:var(--accent-dim)}

/* Chat input */
.chat-in-row{display:flex;align-items:flex-end;gap:8px;padding:10px 12px 12px;border-top:1px solid var(--b1);flex-shrink:0}
.chat-ta{flex:1;background:var(--s2);border:1px solid var(--b2);border-radius:10px;padding:10px 13px;color:var(--t1);font-family:'Geist',sans-serif;font-size:13px;outline:none;resize:none;min-height:42px;max-height:130px;line-height:1.55;transition:border-color .2s,box-shadow .2s;overflow-y:auto}
.chat-ta:focus{border-color:rgba(184,255,87,.35);box-shadow:0 0 0 3px rgba(184,255,87,.06)}
.chat-ta::placeholder{color:var(--t3)}
.send-btn{width:38px;height:38px;border-radius:9px;background:var(--accent);border:none;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:filter .15s,transform .1s;flex-shrink:0}
.send-btn:hover{filter:brightness(1.1)}
.send-btn:active{transform:scale(.92)}
.send-btn:disabled{opacity:.25;cursor:not-allowed;transform:none}
.send-btn svg{width:15px;height:15px}

/* Input area disclaimer */
.input-disclaimer{text-align:center;font-family:'Geist Mono',monospace;font-size:10px;color:var(--t3);padding:4px 12px 8px;display:flex;align-items:center;justify-content:center;gap:5px}
.input-disclaimer i{font-size:9px}

/* Ask error button */
.ask-error-btn{display:block;width:calc(100% - 28px);margin:6px 14px 2px;padding:7px 12px;border-radius:6px;font-family:'Geist',sans-serif;font-size:11px;font-weight:500;cursor:pointer;border:1px solid rgba(255,85,85,.25);background:rgba(255,85,85,.07);color:var(--red);transition:all .15s;text-align:left}
.ask-error-btn:hover{background:rgba(255,85,85,.14);border-color:rgba(255,85,85,.4)}

/* ══ VERTICAL RESIZER ════════════════════════════════ */
.v-resizer{width:5px;flex-shrink:0;cursor:col-resize;position:relative;display:flex;align-items:center;justify-content:center;transition:background .15s;z-index:10;background:transparent}
.v-resizer:hover,.v-resizer.dragging{background:rgba(184,255,87,.08)}
.v-resizer-line{width:1px;height:100%;background:var(--b2);transition:background .15s}
.v-resizer:hover .v-resizer-line,.v-resizer.dragging .v-resizer-line{background:var(--accent)}

/* ══ EDITOR SIDE ══════════════════════════════════════ */
.editor-side{display:flex;flex-direction:column;border-left:1px solid var(--b1);overflow:hidden;width:420px;min-width:220px;flex-shrink:0}
.etoolbar{display:flex;align-items:center;gap:8px;padding:8px 12px;border-bottom:1px solid var(--b1);background:var(--s1);flex-shrink:0}

/* ══ BUTTONS ══════════════════════════════════════════ */
.btn{display:inline-flex;align-items:center;gap:5px;padding:5px 12px;border-radius:7px;font-family:'Geist',sans-serif;font-size:12px;font-weight:500;cursor:pointer;border:1px solid var(--b1);background:transparent;color:var(--t2);transition:color .15s,border-color .15s,background .15s;white-space:nowrap}
.btn:hover{color:var(--t1);border-color:var(--b2);background:var(--s2)}
.btn:active{transform:scale(.97)}

/* Run button — FIXED hover */
.btn-run{background:var(--accent)!important;border-color:var(--accent)!important;color:#080808!important;font-weight:700}
.btn-run:hover{background:var(--accent)!important;border-color:var(--accent)!important;color:#080808!important;filter:brightness(1.12);transform:none}
.btn-run:active{filter:brightness(.95)!important;transform:scale(.97)}
.btn-run:disabled{opacity:.35!important;cursor:not-allowed;filter:none!important;transform:none!important}

.btn-py{font-family:'Geist Mono',monospace;font-size:10px;padding:4px 10px;border-radius:999px;color:var(--blue);border-color:rgba(126,184,255,.2);background:rgba(126,184,255,.05)}
.spinner{width:13px;height:13px;border-radius:50%;border:1.5px solid var(--b2);border-top-color:var(--accent);animation:spin .5s linear infinite;display:none;flex-shrink:0}
.spinner.on{display:block}
.tright{margin-left:auto;display:flex;gap:6px;align-items:center}
.export-btn{justify-content:center;padding:10px!important;font-size:12px}

/* Split editor */
.editors-wrap{flex:1;display:flex;flex-direction:row;overflow:hidden}
.editor-divider{width:4px;background:var(--b1);cursor:col-resize;flex-shrink:0;transition:background .15s}
.editor-divider:hover{background:var(--accent)}

/* CodeMirror */
.cm-wrap{flex:1;overflow:hidden;min-width:0}
.cm-wrap .CodeMirror{height:100%!important;font-family:'Geist Mono',monospace!important;font-size:13px!important;line-height:1.72!important;background:var(--bg)!important;color:#d4d4d4!important}
.theme-light .cm-wrap .CodeMirror{color:#222!important;background:var(--bg)!important}
.theme-high .cm-wrap .CodeMirror{color:#eee!important}
.CodeMirror-gutters{background:var(--s1)!important;border-right:1px solid var(--b1)!important}
.CodeMirror-linenumber{color:var(--t3)!important;font-size:11px}
.CodeMirror-cursor{border-left:2px solid var(--accent)!important}
.CodeMirror-selected{background:rgba(184,255,87,.08)!important}
.CodeMirror-activeline-background{background:rgba(255,255,255,.02)!important}
.cm-keyword{color:#c792ea!important}.cm-string{color:#c3e88d!important}.cm-number{color:#f78c6c!important}
.cm-comment{color:#546e7a!important;font-style:italic}.cm-def{color:#82aaff!important}
.cm-operator{color:#89ddff!important}.cm-builtin{color:#ffcb6b!important}
.cm-variable{color:#d4d4d4!important}.cm-property{color:#80cbc4!important}.cm-atom{color:#f78c6c!important}
.theme-light .cm-keyword{color:#7700cc!important}.theme-light .cm-string{color:#006600!important}
.theme-light .cm-number{color:#cc5500!important}.theme-light .cm-comment{color:#888!important}
.theme-light .cm-def{color:#0055cc!important}.theme-light .cm-builtin{color:#884400!important}
.theme-light .cm-variable{color:#111!important}

/* Drag handle */
.drag-h{height:5px;cursor:ns-resize;flex-shrink:0;background:transparent;transition:background .2s}
.drag-h:hover{background:rgba(184,255,87,.12)}

/* Output pane */
.out-pane{flex-shrink:0;height:190px;border-top:1px solid var(--b1);display:flex;flex-direction:column;background:var(--bg)}
.out-bar{display:flex;align-items:center;padding:0 12px;height:34px;border-bottom:1px solid var(--b1);flex-shrink:0;background:var(--s1)}
.out-label{font-family:'Geist Mono',monospace;font-size:10px;color:var(--t2);letter-spacing:.8px;font-weight:500}
.run-time{font-family:'Geist Mono',monospace;font-size:10px;color:var(--t3);margin-right:8px}
.out-text{flex:1;overflow-y:auto;overflow-x:hidden;padding:12px 14px;font-family:'Geist Mono',monospace;font-size:12px;line-height:1.75;white-space:pre-wrap;word-break:break-all;overflow-wrap:anywhere;color:var(--t2)}
.out-text::-webkit-scrollbar{width:3px}
.out-text::-webkit-scrollbar-thumb{background:var(--b2);border-radius:2px}
.out-text.ok{color:#aaffaa}
.out-text.err{color:var(--red)}
.theme-light .out-text.ok{color:#116600}
.theme-light .out-text.err{color:#cc0000}

/* ══ MODALS ═══════════════════════════════════════════ */
.modal-overlay{position:fixed;inset:0;background:rgba(0,0,0,.65);z-index:100;display:none;align-items:center;justify-content:center;animation:fadeIn .2s ease;backdrop-filter:blur(6px)}
.modal-overlay.open{display:flex}
.modal{background:var(--s1);border:1px solid var(--b2);border-radius:14px;width:460px;max-width:92vw;max-height:85vh;display:flex;flex-direction:column;animation:popIn .2s ease;overflow:hidden;box-shadow:0 24px 60px var(--shadow)}
.modal-wide{width:640px}
.modal-hdr{display:flex;align-items:center;padding:16px 20px;border-bottom:1px solid var(--b1);flex-shrink:0}
.modal-title{font-size:13px;font-weight:600;flex:1;color:var(--t1);letter-spacing:-.1px}
.modal-close{background:none;border:none;color:var(--t2);font-size:20px;cursor:pointer;padding:2px 6px;border-radius:5px;transition:all .15s;line-height:1}
.modal-close:hover{color:var(--t1);background:var(--b1)}
.modal-body{padding:18px 20px;overflow-y:auto;display:flex;flex-direction:column;gap:12px}

/* Shortcuts */
.shortcut-group{margin-bottom:10px}
.sg-label{font-family:'Geist Mono',monospace;font-size:9px;letter-spacing:1.2px;text-transform:uppercase;color:var(--t3);margin-bottom:8px}
.shortcut-row{display:flex;align-items:center;gap:6px;padding:6px 0;border-bottom:1px solid var(--b1);font-size:12px;color:var(--t2)}
.shortcut-row:last-child{border-bottom:none}
.shortcut-row span{margin-left:auto;color:var(--t1)}
kbd{font-family:'Geist Mono',monospace;font-size:10px;background:var(--s3);border:1px solid var(--b2);border-radius:4px;padding:2px 7px;color:var(--t1)}

/* Packages */
.pkg-input-row{display:flex;gap:8px}
.pkg-input{flex:1;background:var(--s2);border:1px solid var(--b1);border-radius:7px;padding:9px 12px;color:var(--t1);font-family:'Geist Mono',monospace;font-size:12px;outline:none;transition:border-color .2s,box-shadow .2s}
.pkg-input:focus{border-color:rgba(184,255,87,.35);box-shadow:0 0 0 3px rgba(184,255,87,.06)}
.pkg-input::placeholder{color:var(--t3)}
.pkg-output{font-family:'Geist Mono',monospace;font-size:11px;background:var(--s3);border:1px solid var(--b1);border-radius:7px;padding:10px;min-height:40px;max-height:160px;overflow-y:auto;overflow-x:hidden;color:var(--t2);line-height:1.6;white-space:pre-wrap;word-break:break-all;overflow-wrap:anywhere;display:none}
.pkg-output.visible{display:block}
.pkg-presets{margin-top:4px}

/* Snippets */
.snippets-grid{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.snippet-card{background:var(--s2);border:1px solid var(--b1);border-radius:9px;padding:13px;cursor:pointer;transition:all .18s}
.snippet-card:hover{border-color:rgba(184,255,87,.25);background:var(--s3);transform:translateY(-1px);box-shadow:0 4px 16px rgba(0,0,0,.2)}
.snippet-name{font-size:12px;font-weight:600;color:var(--t1);margin-bottom:3px}
.snippet-desc{font-size:10px;color:var(--t2);margin-bottom:8px}
.snippet-preview{font-family:'Geist Mono',monospace;font-size:10px;color:var(--accent);background:var(--bg);border-radius:5px;padding:6px 8px;overflow:hidden;white-space:nowrap;text-overflow:ellipsis}

/* Problem search modal */
.problem-list{position:relative;max-height:380px;height:380px;overflow-y:auto;overflow-x:hidden}
.problem-item{display:flex;align-items:center;gap:10px;padding:0 10px;border-radius:7px;cursor:pointer;border:1px solid transparent;transition:background .12s,border-color .12s;box-sizing:border-box}
.problem-item:hover{background:var(--s2);border-color:var(--b1)}
.problem-item.selected{background:var(--accent-dim);border-color:rgba(184,255,87,.2)}
.prob-num{font-family:'Geist Mono',monospace;font-size:10px;color:var(--t3);min-width:32px}
.prob-name{font-size:12px;color:var(--t1);flex:1}
.prob-diff{font-family:'Geist Mono',monospace;font-size:9px;padding:1px 7px;border-radius:999px;flex-shrink:0}
.prob-diff.Easy{color:#57e87a;background:rgba(87,232,122,.08);border:1px solid rgba(87,232,122,.18)}
.prob-diff.Medium{color:var(--orange);background:rgba(245,165,36,.08);border:1px solid rgba(245,165,36,.18)}
.prob-diff.Hard{color:var(--red);background:rgba(255,85,85,.08);border:1px solid rgba(255,85,85,.18)}
.diff-filter-btn{font-family:'Geist Mono',monospace;font-size:10px;padding:2px 10px;border-radius:999px;cursor:pointer;border:1px solid var(--b1);color:var(--t3);transition:all .15s}
.diff-filter-btn:hover,.diff-filter-btn.active{color:var(--t1);background:var(--b1);border-color:var(--b2)}
.diff-filter-btn.easy.active{color:#57e87a;border-color:rgba(87,232,122,.3);background:rgba(87,232,122,.08)}
.diff-filter-btn.medium.active{color:var(--orange);border-color:rgba(245,165,36,.3);background:rgba(245,165,36,.08)}
.diff-filter-btn.hard.active{color:var(--red);border-color:rgba(255,85,85,.3);background:rgba(255,85,85,.08)}

/* Problems loading state */
.problems-loading{display:flex;align-items:center;gap:10px;padding:20px 12px;color:var(--t3);font-size:12px;font-family:'Geist Mono',monospace}
.problems-spinner{width:14px;height:14px;border-radius:50%;border:1.5px solid var(--b2);border-top-color:var(--accent);animation:spin .6s linear infinite;flex-shrink:0}

/* Hint modal */
.hint-level-btn{display:flex;align-items:flex-start;gap:12px;padding:12px 14px;text-align:left;border-radius:8px}
.hint-level-btn span{font-size:18px;flex-shrink:0;margin-top:1px}
.hint-level-btn strong{display:block;font-size:12px;color:var(--t1);margin-bottom:2px}

/* Settings modal */
.settings-section{margin-bottom:4px}
.settings-section .sg-label{margin-bottom:10px}
.setting-row{display:flex;align-items:center;justify-content:space-between;padding:8px 0;border-bottom:1px solid var(--b1);font-size:12px;color:var(--t2)}
.setting-row:last-child{border-bottom:none}
.theme-pick-btn{font-size:11px;padding:4px 10px}
.theme-pick-btn.active-theme{color:var(--accent);border-color:rgba(184,255,87,.3);background:var(--accent-dim)}

/* Toggle switch */
.toggle-switch{position:relative;display:inline-block;width:36px;height:20px;flex-shrink:0}
.toggle-switch input{opacity:0;width:0;height:0}
.toggle-slider{position:absolute;inset:0;background:var(--s3);border-radius:999px;cursor:pointer;transition:all .2s;border:1px solid var(--b2)}
.toggle-slider::before{content:'';position:absolute;width:14px;height:14px;left:2px;top:2px;background:var(--t3);border-radius:50%;transition:all .2s}
.toggle-switch input:checked + .toggle-slider{background:var(--accent);border-color:var(--accent)}
.toggle-switch input:checked + .toggle-slider::before{background:#080808;transform:translateX(16px)}

/* ══ MOBILE NAV ════════════════════════════════════════ */
.mobile-nav{display:none;border-top:1px solid var(--b1);background:var(--s1);flex-shrink:0;padding:6px 16px;gap:8px}
.mob-btn{flex:1;padding:8px 6px;font-family:'Geist',sans-serif;font-size:11px;font-weight:500;color:var(--t2);background:transparent;border:1px solid transparent;border-radius:10px;cursor:pointer;transition:all .2s;display:flex;flex-direction:column;align-items:center;gap:3px}
.mob-btn i{font-size:18px}
.mob-btn span{font-size:10px;letter-spacing:.2px}
.mob-btn.active{color:var(--accent);background:var(--accent-dim);border-color:rgba(184,255,87,.18)}

/* ══ MOBILE MEDIA QUERY ════════════════════════════════ */
@media(max-width:768px){
  /* Layout */
  .app{grid-template-rows:48px 36px 1fr auto;height:100dvh}
  .workspace{flex-direction:column;overflow:hidden}
  .chat-side{width:100%!important;min-width:0!important;flex:1}
  .editor-side{width:100%!important;min-width:0!important;display:none;border-left:none;border-top:1px solid var(--b1)}
  .editor-side.mobile-active{display:flex;flex:1}
  .chat-side.mobile-hidden{display:none}
  .v-resizer{display:none}
  .mobile-nav{display:flex}
  .history-bar{display:none}

  /* Header — icon-only buttons */
  header{padding:0 10px;gap:6px;height:48px}
  .logo{font-size:12px;gap:5px;flex-shrink:0}
  .logo-img{width:20px;height:20px}
  .hdr-center{display:none}
  .hdr-right{gap:3px}
  .hdr-btn{padding:0;width:34px;height:34px;border-radius:8px;display:inline-flex;align-items:center;justify-content:center;font-size:0!important;line-height:1}
  .hdr-btn i{font-size:14px!important;display:block;width:auto;height:auto;font-style:normal}
  .py-badge{display:none}

  /* Tab bar */
  .tabbar{padding:0 6px;height:36px}
  .tab{padding:0 10px 0 8px;font-size:10px;height:36px}

  /* Chat header */
  .chat-hdr{padding:0 10px;height:40px}
  .chat-hdr-title{font-size:11px}
  .chat-hdr .hdr-btn{width:28px;height:28px;border-radius:6px}

  /* Messages */
  .chat-msgs{padding:10px 8px 6px;gap:10px}
  .msg-bbl{font-size:12px;padding:10px 12px;line-height:1.7}
  .msg-bbl pre{font-size:11px;padding:10px;margin:8px 0}
  .msg-bbl h4{font-size:12px}

  /* Chips — single scrollable row */
  .chips{padding:5px 8px;gap:4px;max-height:36px;flex-wrap:nowrap;overflow-x:auto;overflow-y:hidden}
  .chip{font-size:10px;padding:3px 10px;flex-shrink:0}

  /* Input */
  .chat-in-row{padding:8px 8px 8px;gap:6px}
  .chat-ta{font-size:13px;padding:10px 12px;min-height:42px;border-radius:12px}
  .send-btn{width:42px;height:42px;border-radius:12px;flex-shrink:0}
  .input-disclaimer{font-size:9px;padding:2px 8px 6px}

  /* Editor */
  .etoolbar{padding:5px 8px;gap:4px}
  .btn-py{display:none}
  .tright{gap:4px}
  .tright .btn{padding:4px 8px;font-size:10px}
  .out-pane{height:130px}
  .out-text{font-size:11px;padding:8px 10px}

  /* Modals */
  .modal{width:96vw;max-height:92dvh;border-radius:16px}
  .modal-wide{width:96vw}
  .modal-body{padding:14px 14px;gap:10px}

  /* Complexity */
  .complexity-bar{gap:4px}
  .cx-badge{font-size:9px;padding:2px 8px}

  /* Load buttons */
  .load-btns-wrap{gap:5px}
  .load-btn{font-size:10px;padding:5px 10px}
}

/* ══ AUTOCOMPLETE DROPDOWN ═══════════════════════════════ */
.CodeMirror-hints{
  background:var(--s2)!important;
  border:1px solid var(--b2)!important;
  border-radius:8px!important;
  box-shadow:0 8px 24px var(--shadow)!important;
  font-family:'Geist Mono',monospace!important;
  font-size:12px!important;
  padding:4px!important;
  z-index:200!important;
  max-height:200px!important;
  overflow-y:auto!important;
}
.CodeMirror-hint{
  color:var(--t1)!important;
  padding:5px 10px!important;
  border-radius:5px!important;
  cursor:pointer!important;
}
.CodeMirror-hint-active{
  background:var(--accent-dim)!important;
  color:var(--accent)!important;
}

/* ══ TOAST ════════════════════════════════════════════ */
.toast{position:fixed;bottom:20px;left:50%;transform:translateX(-50%);background:var(--s3);border:1px solid var(--b2);border-radius:8px;padding:9px 18px;font-size:12px;font-family:'Geist Mono',monospace;color:var(--t1);z-index:999;animation:slideUp .25s ease;pointer-events:none;box-shadow:0 8px 24px var(--shadow)}

/* ══ SCROLLBARS ══════════════════════════════════════ */
::-webkit-scrollbar{width:3px;height:3px}
::-webkit-scrollbar-track{background:transparent}
::-webkit-scrollbar-thumb{background:var(--b2);border-radius:2px}
::-webkit-scrollbar-thumb:hover{background:var(--b3)}