:root{--bg:#0b0b11;--panel:#11121a;--ink:#f2f2f7;--muted:#b9bac6;--accent:#6ee7b7;--accent2:#93c5fd;--border:#23243a}
*{box-sizing:border-box}html,body{margin:0;height:100%;font-family:Inter,system-ui,Segoe UI,Roboto,Arial,sans-serif}
a{color:inherit}.container{max-width:1100px;margin:0 auto;padding:20px}
.site-header{position:sticky;top:0;background:linear-gradient(180deg,rgba(11,11,17,.95),rgba(11,11,17,.5));backdrop-filter:blur(8px);z-index:10;border-bottom:1px solid var(--border)}
.site-header .row{display:flex;align-items:center;justify-content:space-between;padding:12px 20px}
.brand{display:flex;align-items:center;gap:12px}.brand .logo{font-size:24px}
.badge{display:inline-flex;gap:8px;align-items:center;background:#0d0e14;border:1px solid var(--border);padding:6px 10px;border-radius:10px;color:var(--muted)}
.btn{background:var(--accent);color:#08120e;border:none;border-radius:10px;padding:10px 14px;font-weight:600;cursor:pointer}
.btn.ghost{background:transparent;color:var(--ink);border:1px solid var(--border)}
.grid{display:grid;gap:16px}.panel{background:var(--panel);border:1px solid var(--border);border-radius:14px;padding:16px}
.panel h3{margin:0 0 10px}.kv{display:grid;grid-template-columns:180px 1fr;gap:12px;align-items:center}
input[type=text],input[type=url],input[type=color],textarea,select{width:100%;background:#0c0d13;color:var(--ink);border:1px solid var(--border);border-radius:10px;padding:10px}
textarea{min-height:120px}.small{color:var(--muted);font-size:12px}
hr{border:0;border-top:1px solid var(--border);margin:18px 0}.footer{color:var(--muted);text-align:center;padding:22px}
.preview{border:1px dashed var(--border);border-radius:12px;min-height:200px;background:#0b0c12}
.notice{padding:10px;border:1px solid var(--border);background:#0c0d14;border-radius:10px;color:var(--muted);margin-top:10px}
.success{border-color:#1f3;border-left:4px solid #1f3;color:#9f9}
.error{border-color:#f33;border-left:4px solid #f33;color:#fbb}
label.inline{display:flex;align-items:center;gap:8px}
.codebox{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace}
.filelist a{display:block;padding:6px 8px;border-radius:8px;text-decoration:none;border:1px solid var(--border);margin-bottom:6px;background:#0b0c12}
.filelist a.active{outline:2px solid var(--accent)}
/* === Responsive layout for builder UI === */
/* Two-column layout on wide screens; stack on tablets/phones */
.layout{display:grid; grid-template-columns:minmax(0,1fr) 420px; gap:16px; align-items:start}
@media (max-width: 1100px){ .layout{ grid-template-columns:1fr; } }


/* Label–input rows: collapse to single column on small screens */
.kv{display:grid; grid-template-columns:160px minmax(0,1fr); gap:12px; align-items:center}
@media (max-width: 720px){
.kv{ grid-template-columns:1fr; }
.kv label{ margin-bottom:6px; }
}


/* Tabs: make horizontally scrollable on mobile */
.tabs{ display:flex; gap:8px; border-bottom:1px solid var(--border); overflow:auto; -webkit-overflow-scrolling:touch; }
.tabs button{ flex:0 0 auto; }


/* Buttons: full-width on narrow view for easier tapping */
.actions{ display:flex; flex-wrap:wrap; gap:8px }
@media (max-width: 720px){ .actions .btn{ flex:1 1 100%; } }


/* Preview frame: adaptive height */
.preview{ width:100%; min-height:480px }
@media (max-width: 720px){ .preview{ min-height:360px } }


/* Editor panel: stack controls and widen touch targets on phones */
.toolbar{ gap:8px }
@media (max-width: 720px){
.grid{ gap:12px }
.filelist a{ padding:10px }
.editor{ min-height:280px }
}