:root{
  --onf-bg:#f8fafc;
  --onf-surface:#ffffff;
  --onf-text:#0f172a;
  --onf-muted:#64748b;
  --onf-border:#e2e8f0;
  --onf-accent:#4f46e5;
  --onf-accent-dark:#4338ca;
  --onf-accent-soft:#eef2ff;
  --onf-shadow:0 18px 40px rgba(15,23,42,.08);
  --onf-radius-xl:28px;
  --onf-radius-lg:22px;
  --onf-radius-md:16px;
}
*,
*::before,
*::after{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family:"Inter",system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
  background:var(--onf-bg);
  color:var(--onf-text);
}
a{color:inherit;text-decoration:none}
button,input,textarea{font:inherit}
.onf-wrap{width:min(1280px,calc(100% - 32px));margin:0 auto}
.onf-header{
  position:sticky;top:0;z-index:40;
  background:rgba(255,255,255,.84);
  backdrop-filter:blur(10px);
  border-bottom:1px solid var(--onf-border);
}
.onf-header-inner{
  min-height:72px;display:flex;align-items:center;justify-content:space-between;gap:18px;
}
.onf-brand{display:flex;align-items:center;gap:12px;min-width:0}
.onf-logo-mark{
  width:42px;height:42px;border-radius:14px;background:var(--onf-accent);color:#fff;
  display:inline-flex;align-items:center;justify-content:center;
  box-shadow:0 14px 30px rgba(79,70,229,.25);flex:0 0 auto;
}
.onf-logo-mark.is-small{width:34px;height:34px;border-radius:10px}
.onf-logo-image{max-height:42px;width:auto;display:block}
.onf-logo-text,.onf-footer-title{font-size:1.25rem;font-weight:800;letter-spacing:-.02em}
.onf-desktop-nav{display:flex;align-items:center;gap:26px}
.onf-nav-link{
  color:#64748b;font-size:.95rem;font-weight:600;transition:color .2s ease;
}
.onf-nav-link:hover,.onf-nav-link.is-active{color:var(--onf-accent)}
.onf-header-actions{display:flex;align-items:center;gap:12px}
.onf-language-picker{position:relative}
.onf-language-button{
  display:inline-flex;align-items:center;gap:10px;padding:10px 14px;border:0;
  background:#f1f5f9;border-radius:16px;color:#334155;font-weight:600;cursor:pointer;
}
.onf-language-menu{
  position:absolute;top:calc(100% + 10px);right:0;min-width:220px;
  background:#fff;border:1px solid var(--onf-border);border-radius:22px;
  box-shadow:var(--onf-shadow);padding:10px;opacity:0;visibility:hidden;transform:translateY(10px);
  transition:all .18s ease;z-index:60;
}
.onf-language-picker:hover .onf-language-menu,
.onf-language-picker:focus-within .onf-language-menu{
  opacity:1;visibility:visible;transform:translateY(0);
}
.onf-language-option{
  display:flex;align-items:center;gap:10px;padding:10px 12px;border-radius:14px;
  color:#334155;font-size:.95rem;font-weight:500;
}
.onf-language-option:hover,.onf-language-option.is-active{background:var(--onf-accent-soft);color:var(--onf-accent)}
.onf-mobile-toggle{
  display:none;border:0;background:#fff;color:#475569;width:44px;height:44px;border-radius:14px;cursor:pointer;
}
.onf-mobile-toggle .onf-toggle-close{display:none}
.onf-mobile-toggle.is-open .onf-toggle-open{display:none}
.onf-mobile-toggle.is-open .onf-toggle-close{display:inline-flex}
.onf-mobile-toggle.is-open .onf-toggle-close svg{display:block}
.onf-mobile-menu{
  display:none;position:fixed;inset:72px 0 auto 0;background:#fff;border-bottom:1px solid var(--onf-border);
  box-shadow:0 22px 40px rgba(15,23,42,.08);z-index:35;padding:20px 0;
}
.onf-mobile-menu.is-open{display:block}
.onf-mobile-link{
  display:block;padding:16px 20px;border-radius:20px;background:#f8fafc;margin:0 0 12px;
  font-size:1.08rem;font-weight:700;color:#334155;
}
.onf-mobile-link.is-active{background:var(--onf-accent);color:#fff}
.onf-main{padding:42px 0 54px}
.onf-grid{display:grid;grid-template-columns:minmax(0,2fr) minmax(280px,1fr);gap:32px;align-items:start}
.onf-page-head h1{margin:0 0 10px;font-size:clamp(2rem,3vw,3rem);line-height:1.08;letter-spacing:-.035em}
.onf-page-head p{margin:0;color:var(--onf-muted);font-size:1.125rem;max-width:780px}
.onf-tool-shell{position:relative;margin-top:22px}
.onf-title-input,.onf-textarea,.onf-task-input,.onf-editor{
  width:100%;background:#fff;border:1px solid var(--onf-border);border-radius:22px;
  box-shadow:0 8px 20px rgba(15,23,42,.04);outline:none;transition:border-color .2s ease, box-shadow .2s ease;
}
.onf-title-input:focus,.onf-textarea:focus,.onf-task-input:focus,.onf-editor:focus{
  border-color:#a5b4fc;box-shadow:0 0 0 4px rgba(99,102,241,.12);
}
.onf-title-input{
  padding:18px 20px;font-size:1.25rem;font-weight:800;color:#1e293b;margin-bottom:14px;
}
.onf-toolbar-label{
  font-size:.85rem;font-weight:700;text-transform:uppercase;letter-spacing:.08em;color:#64748b;margin:4px 0 10px;
}
.onf-editor-toolbar{
  display:flex;flex-wrap:wrap;gap:8px;padding:10px 0 12px;
}
.onf-editor-toolbar button,
.onf-case-actions button,
.onf-action-button,
.onf-primary-button{
  border:1px solid var(--onf-border);background:#fff;color:#475569;
  border-radius:14px;padding:11px 14px;display:inline-flex;align-items:center;gap:8px;
  font-weight:600;cursor:pointer;transition:all .2s ease;
}
.onf-editor-toolbar button:hover,
.onf-case-actions button:hover,
.onf-action-button:hover{background:#f8fafc;border-color:#cbd5e1;color:#334155}
.onf-editor{
  min-height:420px;padding:18px 20px;line-height:1.7;color:#334155;
}
.onf-editor:empty::before{
  content:attr(data-placeholder);color:#94a3b8;
}
.onf-editor p{margin:.3em 0}
.onf-editor ul,.onf-editor ol{padding-left:1.25rem}
.onf-editor blockquote{
  border-left:4px solid #cbd5e1;margin:1rem 0;padding-left:1rem;color:#475569;
}
.onf-editor table{width:100%;border-collapse:collapse;margin:1rem 0}
.onf-editor td,.onf-editor th{border:1px solid #cbd5e1;padding:8px}
.onf-editor pre{background:#0f172a;color:#fff;border-radius:16px;padding:14px;overflow:auto}
.onf-stat-grid{
  display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px;margin-bottom:16px;
}
.onf-stat-box{
  background:#fff;border:1px solid #f1f5f9;border-radius:22px;padding:18px 16px;text-align:center;box-shadow:0 8px 18px rgba(15,23,42,.04);
}
.onf-stat-value{font-size:1.8rem;font-weight:800;color:var(--onf-accent)}
.onf-stat-label{font-size:.72rem;font-weight:800;letter-spacing:.12em;text-transform:uppercase;color:#94a3b8;margin-top:6px}
.onf-textarea{
  min-height:320px;padding:22px;color:#334155;resize:vertical;line-height:1.7;
}
.onf-case-actions{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:14px}
.onf-case-actions button{background:var(--onf-accent-soft);border-color:transparent;color:#4338ca}
.onf-case-actions button:hover{background:#e0e7ff}
.onf-todo-card{
  background:#fff;border:1px solid var(--onf-border);border-radius:28px;padding:24px;box-shadow:0 10px 28px rgba(15,23,42,.05)
}
.onf-todo-input-row{display:flex;gap:12px;margin-bottom:16px}
.onf-task-input{padding:13px 16px;border-radius:18px;flex:1}
.onf-primary-button{
  background:var(--onf-accent);border-color:transparent;color:#fff;
}
.onf-primary-button:hover{background:var(--onf-accent-dark)}
.onf-primary-button.is-share{margin-left:auto}
.onf-task-item{
  display:flex;align-items:flex-start;gap:12px;padding:14px;background:#f8fafc;border-radius:18px;margin-bottom:10px;
}
.onf-task-item:last-child{margin-bottom:0}
.onf-task-item input{margin-top:3px}
.onf-task-text{flex:1;color:#334155}
.onf-task-text.is-done{text-decoration:line-through;color:#94a3b8}
.onf-task-delete{
  border:0;background:transparent;color:#94a3b8;cursor:pointer;font-size:1.2rem;line-height:1
}
.onf-tool-actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:16px}
.onf-action-button svg,.onf-primary-button svg{display:block}
.onf-toast{
  position:absolute;right:0;top:100%;margin-top:16px;background:#10b981;color:#fff;
  border-radius:16px;padding:12px 16px;font-size:.95rem;font-weight:700;box-shadow:0 12px 24px rgba(16,185,129,.25);
  opacity:0;visibility:hidden;transform:translateY(-6px);transition:all .2s ease;
}
.onf-toast.is-visible{opacity:1;visibility:visible;transform:translateY(0)}
.onf-related,.onf-article{margin-top:48px;padding-top:40px;border-top:1px solid var(--onf-border)}
.onf-related h2,.onf-why-card h2,.onf-popular-card h2{margin:0 0 20px;font-size:1.4rem;letter-spacing:-.02em}
.onf-related-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}
.onf-related-card{
  display:flex;align-items:center;justify-content:space-between;gap:16px;
  background:#fff;border:1px solid var(--onf-border);border-radius:24px;padding:16px 18px;
  transition:transform .2s ease,border-color .2s ease,box-shadow .2s ease;
}
.onf-related-card:hover{
  border-color:#c7d2fe;transform:translateY(-2px);box-shadow:0 14px 30px rgba(15,23,42,.06)
}
.onf-related-left{display:flex;align-items:center;gap:14px;min-width:0}
.onf-related-icon,.onf-popular-icon{
  width:42px;height:42px;border-radius:14px;background:#f1f5f9;color:#64748b;display:inline-flex;align-items:center;justify-content:center;flex:0 0 auto;
}
.onf-related-title{font-weight:700;color:#334155}
.onf-related-arrow{color:#cbd5e1}
.onf-article-content h2{
  font-size:1.75rem;line-height:1.18;letter-spacing:-.025em;margin:0 0 18px;
}
.onf-article-content h3{
  font-size:1.25rem;line-height:1.3;letter-spacing:-.02em;margin:26px 0 12px;color:#1e293b
}
.onf-article-content p{margin:0 0 16px;color:#475569;line-height:1.82}
.onf-article-content ul,.onf-article-content ol{margin:0 0 16px 1.25rem;color:#475569;line-height:1.8}
.onf-article-content strong{color:#0f172a}
.onf-sidebar{display:flex;flex-direction:column;gap:24px}
.onf-why-card{
  background:#312e81;color:#fff;border-radius:32px;padding:30px;box-shadow:0 20px 40px rgba(79,70,229,.18)
}
.onf-why-card ul{list-style:none;padding:0;margin:0;display:grid;gap:16px}
.onf-why-card li{display:flex;gap:12px;align-items:flex-start;color:#e0e7ff}
.onf-why-card li::before{
  content:"✓";width:26px;height:26px;border-radius:999px;background:rgba(99,102,241,.35);
  display:inline-flex;align-items:center;justify-content:center;color:#fff;font-size:.85rem;flex:0 0 auto;margin-top:1px;
}
.onf-popular-card{
  background:#fff;border:1px solid var(--onf-border);border-radius:30px;padding:28px;
}
.onf-popular-list{display:grid;gap:10px}
.onf-popular-item{
  display:flex;align-items:center;gap:12px;padding:10px;border-radius:16px;color:#475569;font-weight:600;
}
.onf-popular-item:hover{background:#f8fafc}
.onf-ad{
  width:min(1280px,calc(100% - 32px));margin:20px auto 0;background:#fff;border:1px dashed #cbd5e1;border-radius:24px;padding:18px 20px;
}
.onf-ad + .onf-main{padding-top:32px}
.onf-ad-label{
  font-size:.78rem;font-weight:800;text-transform:uppercase;letter-spacing:.11em;color:#94a3b8;margin-bottom:10px
}
.onf-ad-code{color:#475569}
.onf-ad-placeholder{
  min-height:90px;border-radius:18px;background:linear-gradient(135deg,#f8fafc,#eef2ff);
  display:flex;align-items:center;justify-content:center;text-align:center;padding:18px;font-weight:600;color:#64748b
}
.onf-footer{
  margin-top:60px;background:#fff;border-top:1px solid var(--onf-border);padding:44px 0;
}
.onf-footer-inner{
  display:grid;grid-template-columns:1.1fr 1fr auto;gap:22px;align-items:center;
}
.onf-footer-branding{display:grid;gap:10px}
.onf-footer-brand{display:flex;align-items:center;gap:12px}
.onf-footer-logo{max-height:34px;width:auto}
.onf-footer-note,.onf-footer-copy{margin:0;color:#94a3b8;font-size:.95rem;line-height:1.6}
.onf-footer-links{display:flex;flex-wrap:wrap;gap:18px;justify-content:flex-end}
.onf-footer-link{color:#64748b;font-weight:600}
.onf-footer-link:hover{color:var(--onf-accent)}
.screen-reader-text{
  border:0;clip:rect(1px,1px,1px,1px);clip-path:inset(50%);
  height:1px;margin:-1px;overflow:hidden;padding:0;position:absolute!important;width:1px;word-wrap:normal!important;
}
@media (max-width: 1100px){
  .onf-grid{grid-template-columns:1fr}
  .onf-sidebar{order:2}
}
@media (max-width: 920px){
  .onf-desktop-nav{display:none}
  .onf-mobile-toggle{display:inline-flex;align-items:center;justify-content:center}
  .onf-language-button span{display:none}
  .onf-footer-inner{grid-template-columns:1fr}
  .onf-footer-links{justify-content:flex-start}
}
@media (max-width: 760px){
  .onf-main{padding:30px 0 36px}
  .onf-wrap{width:min(1280px,calc(100% - 20px))}
  .onf-related-grid{grid-template-columns:1fr}
  .onf-stat-grid{grid-template-columns:1fr}
  .onf-todo-input-row{flex-direction:column}
  .onf-tool-actions{align-items:stretch}
  .onf-action-button,.onf-primary-button{justify-content:center}
  .onf-primary-button.is-share{margin-left:0}
}