*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
--bg:#f8f7f4;--bg2:#ffffff;--bg3:#f0efe9;--bg4:#e8e7e0;
--fg:#18181b;--fg2:#52525b;--fg3:#a1a1aa;
--accent:#2563eb;--accent2:#1d4ed8;--accent-bg:#eff6ff;--accent-fg:#1e40af;
--success:#16a34a;--success-bg:#f0fdf4;--success-fg:#15803d;
--danger:#dc2626;--danger-bg:#fef2f2;--danger-fg:#b91c1c;
--warn:#d97706;--warn-bg:#fffbeb;--warn-fg:#b45309;
--border:#e4e4e7;--border2:#d1d5db;
--shadow:0 1px 3px rgba(0,0,0,.08),0 1px 2px rgba(0,0,0,.04);
--shadow2:0 4px 16px rgba(0,0,0,.10);
--radius:10px;--radius-sm:6px;--radius-lg:16px;
--mono:'JetBrains Mono',monospace;
--sans:'Pretendard','Segoe UI',system-ui,sans-serif;
--nav-h:60px;
}
[data-theme=dark]{
--bg:#0f0f11;--bg2:#18181b;--bg3:#1c1c21;--bg4:#27272a;
--fg:#f4f4f5;--fg2:#a1a1aa;--fg3:#52525b;
--accent:#3b82f6;--accent2:#60a5fa;--accent-bg:#1e3a5f;--accent-fg:#93c5fd;
--success:#22c55e;--success-bg:#052e16;--success-fg:#4ade80;
--danger:#f87171;--danger-bg:#450a0a;--danger-fg:#fca5a5;
--warn:#fbbf24;--warn-bg:#451a03;--warn-fg:#fcd34d;
--border:#27272a;--border2:#3f3f46;
--shadow:0 1px 3px rgba(0,0,0,.3),0 1px 2px rgba(0,0,0,.2);
--shadow2:0 4px 16px rgba(0,0,0,.4);
}
html{font-family:var(--sans);font-size:15px;background:var(--bg);color:var(--fg);transition:background .2s,color .2s}
body{min-height:100vh;display:flex;flex-direction:column}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
button{font-family:var(--sans);cursor:pointer;border:none;background:none}
input,select,textarea{font-family:var(--sans);font-size:14px;color:var(--fg);background:var(--bg2);border:1px solid var(--border2);border-radius:var(--radius-sm);padding:9px 12px;outline:none;transition:border-color .15s,box-shadow .15s;width:100%}
input:focus,select:focus,textarea:focus{border-color:var(--accent);box-shadow:0 0 0 3px rgba(37,99,235,.15)}
textarea{resize:vertical}
.btn{display:inline-flex;align-items:center;gap:6px;padding:9px 18px;border-radius:var(--radius-sm);font-size:14px;font-weight:500;transition:all .15s;cursor:pointer;border:1.5px solid transparent;white-space:nowrap}
.btn-primary{background:var(--accent);color:#fff;border-color:var(--accent)}
.btn-primary:hover{background:var(--accent2);border-color:var(--accent2)}
.btn-outline{background:transparent;color:var(--fg);border-color:var(--border2)}
.btn-outline:hover{background:var(--bg3);border-color:var(--border)}
.btn-danger{background:var(--danger);color:#fff;border-color:var(--danger)}
.btn-danger:hover{opacity:.85}
.btn-sm{padding:6px 12px;font-size:13px}
.btn-xs{padding:4px 10px;font-size:12px}
.btn:disabled{opacity:.5;cursor:not-allowed}

nav{position:sticky;top:0;z-index:100;height:var(--nav-h);background:var(--bg2);border-bottom:1px solid var(--border);display:flex;align-items:center;padding:0 24px;gap:24px;box-shadow:var(--shadow)}
.nav-logo{font-size:18px;font-weight:700;color:var(--fg);letter-spacing:-.5px;flex-shrink:0}
.nav-logo span{color:var(--accent)}
.nav-links{display:flex;gap:4px;align-items:center;flex:1}
.nav-links a{color:var(--fg2);font-size:14px;font-weight:500;padding:6px 12px;border-radius:var(--radius-sm);transition:all .15s}
.nav-links a:hover,.nav-links a.active{color:var(--fg);background:var(--bg3);text-decoration:none}
.nav-right{display:flex;align-items:center;gap:10px;margin-left:auto}
.nav-user{display:flex;align-items:center;gap:8px;font-size:14px}
.avatar{width:32px;height:32px;border-radius:50%;background:var(--accent-bg);color:var(--accent-fg);display:flex;align-items:center;justify-content:center;font-size:13px;font-weight:600;flex-shrink:0}

.theme-btn{width:36px;height:36px;border-radius:var(--radius-sm);display:flex;align-items:center;justify-content:center;color:var(--fg2);border:1px solid var(--border);background:var(--bg2);font-size:16px;cursor:pointer;transition:all .15s}
.theme-btn:hover{background:var(--bg3)}

main{flex:1;padding:32px 24px;max-width:1100px;width:100%;margin:0 auto}
.page-header{margin-bottom:28px}
.page-header h1{font-size:26px;font-weight:700;letter-spacing:-.5px;margin-bottom:6px}
.page-header p{color:var(--fg2);font-size:15px}

.card{background:var(--bg2);border:1px solid var(--border);border-radius:var(--radius-lg);padding:24px;box-shadow:var(--shadow)}
.card-sm{padding:16px}

.grid-2{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:16px}
.grid-3{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:12px}

.tag{display:inline-flex;align-items:center;padding:3px 10px;border-radius:99px;font-size:12px;font-weight:500}
.tag-blue{background:var(--accent-bg);color:var(--accent-fg)}
.tag-green{background:var(--success-bg);color:var(--success-fg)}
.tag-red{background:var(--danger-bg);color:var(--danger-fg)}
.tag-warn{background:var(--warn-bg);color:var(--warn-fg)}
.tag-gray{background:var(--bg3);color:var(--fg2)}

.table-wrap{overflow-x:auto;border-radius:var(--radius);border:1px solid var(--border)}
table{width:100%;border-collapse:collapse;font-size:14px}
th{background:var(--bg3);color:var(--fg2);font-weight:600;font-size:12px;text-transform:uppercase;letter-spacing:.04em;padding:10px 14px;text-align:left;border-bottom:1px solid var(--border)}
td{padding:11px 14px;border-bottom:1px solid var(--border);vertical-align:middle}
tr:last-child td{border-bottom:none}
tr:hover td{background:var(--bg3)}

.form-row{display:flex;flex-direction:column;gap:5px;margin-bottom:16px}
.form-row label{font-size:13px;font-weight:600;color:var(--fg2)}
.form-hint{font-size:12px;color:var(--fg3);margin-top:3px}
.form-error{font-size:12px;color:var(--danger);margin-top:3px}
.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}
@media(max-width:600px){.form-grid{grid-template-columns:1fr}}

.divider{height:1px;background:var(--border);margin:20px 0}

.alert{padding:12px 16px;border-radius:var(--radius-sm);font-size:14px;display:flex;gap:10px;align-items:flex-start}
.alert-info{background:var(--accent-bg);color:var(--accent-fg)}
.alert-success{background:var(--success-bg);color:var(--success-fg)}
.alert-danger{background:var(--danger-bg);color:var(--danger-fg)}
.alert-warn{background:var(--warn-bg);color:var(--warn-fg)}

.toast-container{position:fixed;bottom:24px;right:24px;z-index:999;display:flex;flex-direction:column;gap:8px;pointer-events:none}
.toast{background:var(--fg);color:var(--bg);padding:12px 18px;border-radius:var(--radius);font-size:14px;font-weight:500;box-shadow:var(--shadow2);pointer-events:all;display:flex;align-items:center;gap:8px;animation:slideIn .2s ease;max-width:320px}
.toast-success{background:var(--success)}
.toast-danger{background:var(--danger)}
@keyframes slideIn{from{transform:translateY(20px);opacity:0}to{transform:translateY(0);opacity:1}}

.spinner{display:inline-block;width:20px;height:20px;border:2.5px solid var(--border2);border-top-color:var(--accent);border-radius:50%;animation:spin .6s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}

.empty-state{text-align:center;padding:60px 20px;color:var(--fg2)}
.empty-state .icon{font-size:40px;margin-bottom:12px;opacity:.4}
.empty-state h3{font-size:16px;font-weight:600;margin-bottom:6px;color:var(--fg)}
.empty-state p{font-size:14px}

.code-block{font-family:var(--mono);font-size:13px;background:var(--bg3);border:1px solid var(--border);border-radius:var(--radius-sm);padding:14px;overflow-x:auto;line-height:1.6;white-space:pre-wrap;word-break:break-all}

.modal-overlay{position:fixed;inset:0;background:rgba(0,0,0,.45);z-index:200;display:flex;align-items:center;justify-content:center;padding:16px}
.modal{background:var(--bg2);border-radius:var(--radius-lg);padding:28px;max-width:480px;width:100%;box-shadow:var(--shadow2);border:1px solid var(--border)}
.modal h2{font-size:18px;font-weight:700;margin-bottom:8px}
.modal p{font-size:14px;color:var(--fg2);line-height:1.6;margin-bottom:20px}

.sidebar-layout{display:grid;grid-template-columns:240px 1fr;gap:24px;align-items:start}
@media(max-width:900px){.sidebar-layout{grid-template-columns:1fr}}
.sidebar-nav{background:var(--bg2);border:1px solid var(--border);border-radius:var(--radius-lg);padding:12px;position:sticky;top:80px}
.sidebar-nav a{display:flex;align-items:center;gap:10px;padding:9px 12px;border-radius:var(--radius-sm);font-size:14px;color:var(--fg2);font-weight:500;transition:all .15s;text-decoration:none}
.sidebar-nav a:hover,.sidebar-nav a.active{color:var(--fg);background:var(--bg3)}
.sidebar-nav .nav-section{font-size:11px;font-weight:700;text-transform:uppercase;letter-spacing:.08em;color:var(--fg3);padding:8px 12px 4px}

.problem-difficulty{font-size:12px;font-weight:600;padding:2px 8px;border-radius:99px}
.diff-easy{background:#dcfce7;color:#15803d}
.diff-medium{background:#fef9c3;color:#a16207}
.diff-hard{background:#fee2e2;color:#b91c1c}
[data-theme=dark] .diff-easy{background:#052e16;color:#4ade80}
[data-theme=dark] .diff-medium{background:#422006;color:#fcd34d}
[data-theme=dark] .diff-hard{background:#450a0a;color:#fca5a5}

.submission-status{font-size:13px;font-weight:600;padding:3px 10px;border-radius:99px}
.status-accepted{background:#dcfce7;color:#15803d}
.status-wrong{background:#fee2e2;color:#b91c1c}
.status-pending{background:#eff6ff;color:#1d4ed8}
.status-running{background:#fffbeb;color:#b45309}
.status-error{background:#faf5ff;color:#7c3aed}
[data-theme=dark] .status-accepted{background:#052e16;color:#4ade80}
[data-theme=dark] .status-wrong{background:#450a0a;color:#fca5a5}
[data-theme=dark] .status-pending{background:#1e3a5f;color:#93c5fd}
[data-theme=dark] .status-running{background:#451a03;color:#fcd34d}
[data-theme=dark] .status-error{background:#2e1065;color:#d8b4fe}

.timeline{display:flex;flex-direction:column;gap:0}
.timeline-item{display:flex;gap:12px;padding:12px 0}
.timeline-item:not(:last-child){border-bottom:1px solid var(--border)}
.timeline-dot{width:8px;height:8px;border-radius:50%;background:var(--accent);flex-shrink:0;margin-top:5px}
.timeline-dot.done{background:var(--success)}
.timeline-dot.error{background:var(--danger)}
.timeline-dot.pending{background:var(--border2)}
.timeline-content{flex:1;min-width:0}
.timeline-content h4{font-size:14px;font-weight:600;margin-bottom:2px}
.timeline-content p{font-size:13px;color:var(--fg2)}

.secret-box{background:var(--danger-bg);border:2px solid var(--danger);border-radius:var(--radius);padding:16px;margin-top:12px}
.secret-box h4{color:var(--danger-fg);font-size:14px;font-weight:700;margin-bottom:8px}
.secret-val{font-family:var(--mono);font-size:13px;background:var(--bg2);padding:10px;border-radius:var(--radius-sm);border:1px solid var(--border);word-break:break-all;margin-bottom:10px}

.health-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:12px;margin-bottom:20px}
.health-card{background:var(--bg2);border:1px solid var(--border);border-radius:var(--radius);padding:14px;text-align:center}
.health-card .label{font-size:11px;color:var(--fg3);font-weight:600;text-transform:uppercase;letter-spacing:.06em;margin-bottom:6px}
.health-card .value{font-size:20px;font-weight:700}
.health-card .value.ok{color:var(--success)}
.health-card .value.err{color:var(--danger)}

.prob-detail-grid{display:grid;grid-template-columns:1fr 380px;gap:24px;align-items:start}
@media(max-width:860px){.prob-detail-grid{grid-template-columns:1fr}}

.ex-block{background:var(--bg3);border-radius:var(--radius-sm);border:1px solid var(--border);overflow:hidden;margin-bottom:12px}
.ex-block-head{font-size:12px;font-weight:700;color:var(--fg3);padding:6px 12px;border-bottom:1px solid var(--border);text-transform:uppercase;letter-spacing:.06em}
.ex-block pre{font-family:var(--mono);font-size:13px;padding:12px;overflow-x:auto;white-space:pre-wrap}

.info-chips{display:flex;flex-wrap:wrap;gap:8px;margin:10px 0}
.chip{display:inline-flex;align-items:center;gap:5px;font-size:12px;font-weight:500;color:var(--fg2);background:var(--bg3);padding:4px 10px;border-radius:99px;border:1px solid var(--border)}

#app{display:flex;flex-direction:column;min-height:100vh}
.page{animation:fadeIn .18s ease}
@keyframes fadeIn{from{opacity:0;transform:translateY(4px)}to{opacity:1;transform:translateY(0)}}

footer{background:var(--bg2);border-top:1px solid var(--border);padding:24px;text-align:center;color:var(--fg3);font-size:13px;margin-top:auto}

@media(max-width:700px){
  nav{padding:0 16px;gap:12px}
  main{padding:20px 16px}
  .nav-links{display:none}
}


.resizer-handle{width:8px;cursor:col-resize;position:relative;user-select:none}
.resizer-handle::before{content:"";position:absolute;left:3px;top:0;bottom:0;width:2px;background:var(--border);border-radius:2px}
@media(max-width:860px){.resizer-handle{display:none}}
.monaco-shell{border:1px solid var(--border);border-radius:var(--radius-sm);overflow:hidden;background:var(--bg2);margin-top:10px}
.monaco-editor-host{height:420px;width:100%}
.monaco-toolbar{display:flex;align-items:center;justify-content:space-between;padding:8px 10px;border-bottom:1px solid var(--border);background:var(--bg3);font-size:12px;color:var(--fg2)}
.monaco-placeholder{font-family:var(--mono);font-size:13px;color:var(--fg3);padding:14px}