:root{
  --cv-font:'Segoe UI', Arial, sans-serif;
  --cv-line:#c7d3e2;
  --cv-line-2:#99b0c8;
  --cv-bg:#eaf1f8;
  --cv-panel:#ffffff;
  --cv-panel-soft:#f7fbff;
  --cv-text:#17324d;
  --cv-muted:#607488;
  --cv-shadow:0 14px 34px rgba(18,37,56,.12);
  --cv-soft-shadow:0 8px 20px rgba(18,37,56,.08);
  --cv-accent:#2563eb;
  --cv-accent-soft:#dcebff;
  --cv-key-h:52px;
  --cv-key1:#ffffff;
  --cv-key2:#e8eef7;
  --cv-key-special1:#eef4fb;
  --cv-key-special2:#dce6f2;
  --cv-key-blue1:#e7f0ff;
  --cv-key-blue2:#cfe1ff;
  --cv-key-dark1:#dfe8f2;
  --cv-key-dark2:#c9d7e6;
}

*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  background:linear-gradient(180deg,#dfe9f5 0%, var(--cv-bg) 100%);
  color:var(--cv-text);
  font-family:var(--cv-font);
  min-height:100vh;
  padding:14px;
}

.cv-app-shell{
  width:min(100%,1400px);
  margin:0 auto;
}

.cv-page-topbar{
  display:flex;
  justify-content:space-between;
  align-items:center;
  gap:14px;
  padding:14px 18px;
  border:1px solid rgba(255,255,255,.65);
  border-radius:22px;
  background:rgba(255,255,255,.75);
  backdrop-filter:blur(8px);
  box-shadow:var(--cv-shadow);
  margin-bottom:16px;
}

.cv-brand{display:flex;align-items:center;gap:12px}
.cv-brand-logo{
  width:46px;height:46px;border-radius:14px;
  display:flex;align-items:center;justify-content:center;
  background:linear-gradient(135deg,#67a8ff 0%, #2563eb 100%);
  color:#fff;font-size:22px;font-weight:700;
}
.cv-brand-title{font-size:22px;font-weight:700;line-height:1.1}
.cv-brand-subtitle{font-size:13px;color:var(--cv-muted);margin-top:2px}

.cv-page-actions{display:flex;gap:10px;flex-wrap:wrap}
.cv-page-btn{
  min-height:40px;
  border:1px solid var(--cv-line);
  border-radius:12px;
  background:#fff;
  padding:0 14px;
  font:600 14px var(--cv-font);
  color:var(--cv-text);
  cursor:pointer;
}

.cv-demo-area{
  display:grid;
  grid-template-columns:1fr;
  gap:16px;
}

.cv-demo-card{
  background:rgba(255,255,255,.78);
  border:1px solid rgba(255,255,255,.65);
  border-radius:20px;
  box-shadow:var(--cv-soft-shadow);
  padding:18px;
}

.cv-demo-card h2{
  margin:0 0 10px;
  font-size:20px;
}

.cv-demo-card p{
  margin:0 0 12px;
  color:var(--cv-muted);
}

.cv-demo-textarea{
  width:100%;
  min-height:180px;
  resize:vertical;
  border:1px solid var(--cv-line);
  border-radius:16px;
  padding:14px;
  background:#fff;
  font:400 17px/1.5 var(--cv-font);
  color:var(--cv-text);
}

.cv-btn,.cv-select{
  min-height:38px;
  border:1px solid var(--cv-line);
  border-radius:12px;
  background:#fff;
  color:var(--cv-text);
  padding:0 12px;
  font:600 14px var(--cv-font);
}

.cv-btn{cursor:pointer}

.cv-side{
  border:1px solid var(--cv-line);
  border-radius:18px;
  background:linear-gradient(180deg,#fbfdff 0%, #f3f8fd 100%);
  box-shadow:var(--cv-soft-shadow);
  padding:14px;
}

.cv-section-title{
  margin:0 0 10px;
  font-size:15px;
  font-weight:700;
}

.cv-help{
  font-size:13px;
  line-height:1.45;
  color:var(--cv-muted);
  margin-bottom:12px;
}

.layout-grid{
  display:grid;
  grid-template-columns:repeat(2,minmax(0,1fr));
  gap:10px;
}

.layout-card{
  border:1px solid var(--cv-line);
  border-radius:14px;
  background:#fff;
  padding:10px;
  text-align:left;
  cursor:pointer;
}

.layout-card.active{
  background:linear-gradient(180deg,#f6fbff 0%, #e7f2ff 100%);
  border-color:#8eb2e6;
  box-shadow:inset 0 0 0 2px rgba(37,99,235,.08);
}

.layout-name{
  font-size:12px;
  font-weight:700;
  margin-bottom:8px;
}

.layout-preview{
  display:flex;
  flex-direction:column;
  gap:5px;
}

.preview-row{
  display:flex;
  gap:4px;
}

.preview-key{
  height:12px;
  flex:1;
  border-radius:4px;
  background:#dbe7f4;
}

.preview-key.accent{
  background:#8cb7ff;
}

.cv-option-list{
  margin-top:14px;
  display:grid;
  gap:10px;
}

.cv-checkline{
  display:flex;
  gap:10px;
  align-items:center;
  padding:10px 12px;
  border:1px solid var(--cv-line);
  border-radius:12px;
  background:#fff;
  font-size:14px;
}

@media (max-width: 900px){
  .cv-page-topbar{flex-direction:column;align-items:stretch}
}