:root{
  --bg:#f6f7fb;
  --card:#ffffff;
  --muted:#6b7280;
  --accent:#0f62fe;
  --accent-dark:#0b54d3;
  --glass: rgba(255,255,255,0.6);
  --shadow: 0 6px 18px rgba(16,24,40,0.08);
}
*{box-sizing:border-box}
body{font-family:Inter,system-ui,-apple-system,Segoe UI,Roboto,'Helvetica Neue',Arial; margin:0; background:linear-gradient(180deg,var(--bg),#fff); color:#111}
.container{max-width:1100px;margin:0 auto;padding:24px}
.site-header{background:var(--card);border-bottom:1px solid #eceff4}
.header-inner{display:flex;align-items:center;justify-content:space-between;padding:16px 24px}
.logo{font-weight:700;color:var(--accent);text-decoration:none;font-size:20px}
.nav a{margin-left:18px;color:var(--muted);text-decoration:none}
.main-grid{display:grid;grid-template-columns:1fr 320px;gap:24px;padding:32px 0}
.hero h1{margin:0 0 8px;font-size:28px}
.hero p{margin:0 0 18px;color:var(--muted)}
.upload-card{background:var(--card);box-shadow:var(--shadow);border-radius:12px;padding:18px;display:flex;gap:18px}
.file-drop{flex:1;display:block;border:2px dashed #e6eefc;border-radius:8px;padding:18px;cursor:pointer;text-decoration:none;color:inherit}
.file-drop input{display:none}
.file-drop-inner{display:flex;gap:12px;align-items:center}
.file-drop strong{display:block}
.editor{width:420px;display:flex;flex-direction:column;gap:12px}
.preview{background:#fbfdff;border-radius:8px;padding:12px;border:1px solid #eef3ff;min-height:160px;display:flex;align-items:center;justify-content:center}
.controls{background:var(--card);padding:12px;border-radius:8px;border:1px solid #f0f4ff}
.controls h3{margin:0 0 8px}
.row{display:flex;gap:8px}
label{display:block;font-size:13px;color:var(--muted);}
input[type=number]{width:120px;padding:8px;border-radius:6px;border:1px solid #e6eefc}
.checkbox{display:flex;align-items:center;gap:8px;margin-top:8px}
.btn{padding:10px 14px;border-radius:8px;border:1px solid #e6eefc;background:transparent;cursor:pointer}
.btn.primary{background:var(--accent);color:#fff;border-color:var(--accent)}
.hint{font-size:13px;color:var(--muted);margin-top:8px}
.info-panel{background:var(--card);padding:18px;border-radius:12px;border:1px solid #eef3ff}

.start-btn{position:fixed;right:20px;bottom:20px;width:56px;height:56px;border-radius:50%;border:none;background:linear-gradient(180deg,var(--accent),var(--accent-dark));color:white;font-size:20px;box-shadow:0 8px 24px rgba(11,84,211,0.24);cursor:pointer}

.action-menu{position:fixed;right:20px;bottom:96px;width:320px;background:var(--card);border-radius:12px;box-shadow:0 12px 40px rgba(2,6,23,0.12);transform:translateY(12px);opacity:0;pointer-events:none;transition:all .22s ease}
.action-menu[aria-hidden="false"]{transform:translateY(0);opacity:1;pointer-events:auto}
.menu-inner{padding:12px}
.menu-inner header{display:flex;justify-content:space-between;align-items:center}
.menu-inner nav{display:flex;flex-direction:column;gap:8px;margin:12px 0}
.tool{padding:10px;border-radius:8px;border:1px solid #eef3ff;background:transparent;text-align:left;cursor:pointer}
.tool.active{background:#f0f6ff;border-color:var(--accent)}
.close{border:none;background:transparent;cursor:pointer;font-size:16px}

@media(max-width:900px){
  .main-grid{grid-template-columns:1fr;}
  .editor{width:100%}
  .action-menu{right:12px;left:12px}
}