:root{
  --bg:#f6f8fb;
  --panel:#ffffff;
  --panel-soft:#f0f4fb;
  --text:#142033;
  --muted:#5d6b82;
  --line:#d7dfeb;
  --accent:#2f6cff;
  --accent-soft:#e9f0ff;
  --shadow:0 10px 30px rgba(17,35,68,.08);
  --radius:18px;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0;font-family:system-ui,-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;color:var(--text);background:var(--bg)}
a{color:var(--accent);text-decoration:none}
.container{width:min(1120px,calc(100% - 32px));margin:0 auto}
.site-header{padding:72px 0 48px;background:linear-gradient(180deg,#eef4ff,transparent)}
.header-inner{display:flex;align-items:center;min-height:280px}
.eyebrow{font-size:13px;font-weight:700;color:var(--accent);letter-spacing:.04em;text-transform:uppercase}
h1{font-size:clamp(32px,5vw,56px);line-height:1.05;margin:10px 0 16px}
h2{font-size:clamp(24px,3vw,34px);margin:0 0 16px}
h3{font-size:20px;margin:0 0 10px}
.lead{font-size:20px;line-height:1.7;color:var(--muted);margin:0 0 24px}
.section{padding:40px 0}
.section-alt{background:#eef3fb;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.card{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:24px}
.grid-2,.grid-3{display:grid;gap:20px}
.grid-2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid-3{grid-template-columns:repeat(3,minmax(0,1fr))}
.clean-list{margin:0;padding-left:18px;line-height:1.9;color:var(--muted)}
.step-card{position:relative;padding-top:56px}
.step{position:absolute;top:18px;left:18px;width:28px;height:28px;border-radius:999px;background:var(--accent-soft);color:var(--accent);display:flex;align-items:center;justify-content:center;font-weight:800}
.btn{display:inline-flex;align-items:center;gap:8px;padding:12px 18px;border-radius:999px;border:1px solid var(--line);background:#fff;color:var(--text);font-weight:700}
.btn.primary{background:var(--accent);border-color:var(--accent);color:#fff}
.cta-row{display:flex;gap:12px;flex-wrap:wrap}
/* Studio */
.app-shell{height:100vh;display:grid;grid-template-rows:60px 1fr;background:var(--bg)}
.app-topbar{display:flex;align-items:center;gap:10px;padding:10px 14px;border-bottom:1px solid var(--line);background:#fff}
.brand{font-weight:800;white-space:nowrap}
.muted{color:var(--muted)}
.spacer{flex:1}
.pill,.tool-btn,.tag-btn{display:inline-flex;align-items:center;gap:6px;font-size:12px;border:1px solid var(--line);background:#fff;padding:7px 10px;border-radius:999px;color:var(--muted)}
.tool-btn{font-size:13px;color:var(--text);cursor:pointer}
.tool-btn.primary{background:var(--accent);border-color:var(--accent);color:#fff}
.tool-btn:hover,.tag-btn:hover{transform:translateY(-1px)}
.app-main{display:grid;grid-template-columns:360px 1fr;min-height:0}
.sidebar{border-right:1px solid var(--line);background:#f9fbff;display:flex;flex-direction:column;min-height:0}
.sidebar-head{padding:14px;border-bottom:1px solid var(--line);display:flex;flex-direction:column;gap:10px}
.search{display:flex;align-items:center;gap:8px;border:1px solid var(--line);background:#fff;padding:10px 12px;border-radius:14px}
.search input,.field input,.field textarea,.field select{width:100%;border:0;outline:0;background:transparent;color:var(--text);font:inherit}
.tag-bar{display:flex;gap:8px;flex-wrap:wrap}
.tag-btn{cursor:pointer}
.tag-btn.active{background:var(--accent-soft);color:var(--accent);border-color:#bfd1ff}
.list{padding:12px;overflow:auto;display:flex;flex-direction:column;gap:8px}
.list-item{background:#fff;border:1px solid transparent;border-radius:14px;padding:12px;cursor:pointer;display:flex;flex-direction:column;gap:6px}
.list-item:hover{border-color:var(--line)}
.list-item.active{border-color:#bfd1ff;background:var(--accent-soft)}
.item-title{font-weight:800;font-size:14px}
.item-meta,.item-snippet{font-size:12px;color:var(--muted);line-height:1.5}
.main{display:grid;grid-template-rows:52px 1fr;min-height:0}
.main-head{display:flex;align-items:center;gap:10px;padding:8px 12px;border-bottom:1px solid var(--line);background:#fff;flex-wrap:wrap}
.tabs{display:flex;gap:8px;flex-wrap:wrap}
.tab{padding:8px 12px;border-radius:999px;border:1px solid var(--line);background:#fff;color:var(--muted);font-size:12px;font-weight:700;cursor:pointer}
.tab.active{background:var(--accent-soft);border-color:#bfd1ff;color:var(--accent)}
.workspace{display:grid;grid-template-columns:1fr 1fr;min-height:0}
.pane{display:flex;flex-direction:column;min-width:0;min-height:0}
.pane-head{display:flex;align-items:center;justify-content:space-between;padding:10px 12px;border-bottom:1px solid var(--line);background:#fff;font-size:12px;color:var(--muted);gap:10px;flex-wrap:wrap}
.editor{width:100%;height:100%;padding:16px 18px;border:0;resize:none;outline:0;background:#f4f7fc;color:var(--text);font:14px/1.7 ui-monospace,SFMono-Regular,Menlo,Consolas,monospace}
.preview{height:100%;overflow:auto;background:#fff;padding:22px 24px 72px;line-height:1.8}
.preview h1,.preview h2,.preview h3{line-height:1.35}
.preview h1{border-bottom:1px solid var(--line);padding-bottom:8px}
.preview pre{overflow:auto;background:#0f172a;color:#e2e8f0;padding:14px;border-radius:14px}
.preview code{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace}
.preview blockquote{margin:16px 0;padding:12px 14px;border-left:4px solid var(--accent);background:var(--panel-soft);border-radius:10px}
.preview table{width:100%;border-collapse:collapse;margin:16px 0}
.preview th,.preview td{border:1px solid var(--line);padding:8px 10px;text-align:left}
.preview th{background:#f5f8fd}
.hidden{display:none!important}
.modal-backdrop{position:fixed;inset:0;background:rgba(15,23,42,.45);display:flex;align-items:center;justify-content:center;padding:18px;z-index:1000}
.modal{width:min(840px,96vw);background:#fff;border:1px solid var(--line);border-radius:20px;box-shadow:var(--shadow);overflow:hidden}
.modal-head,.modal-foot{padding:14px 16px;border-bottom:1px solid var(--line);display:flex;align-items:center;gap:10px}
.modal-foot{border-bottom:0;border-top:1px solid var(--line);justify-content:flex-end;flex-wrap:wrap}
.modal-body{padding:16px;max-height:70vh;overflow:auto;display:flex;flex-direction:column;gap:14px}
.field{display:flex;flex-direction:column;gap:6px}
.field label{font-size:12px;color:var(--muted);font-weight:700}
.field input,.field textarea,.field select{border:1px solid var(--line);padding:11px 12px;border-radius:12px;background:#fff}
.grid-2-form{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}
.template-card{display:flex;justify-content:space-between;gap:12px;align-items:flex-start;padding:14px;border:1px solid var(--line);border-radius:14px;background:#fff;cursor:pointer}
.template-card:hover{border-color:#bfd1ff;background:var(--accent-soft)}
.note-box{border:1px solid var(--line);border-radius:12px;padding:12px;background:#f8fbff;color:var(--muted);font-size:13px;line-height:1.7}
.footer-note{font-size:12px;color:var(--muted)}
@media (max-width: 980px){
  .grid-2,.grid-3{grid-template-columns:1fr}
  .app-main{grid-template-columns:1fr}
  .sidebar{max-height:42vh}
  .workspace{grid-template-columns:1fr}
}