/* ===== Top bar ===== */
.topbar{
  display:flex; justify-content:space-between; align-items:center;
  padding:14px 20px; background:#0f1629; border-bottom:1px solid #1c2742;
  position:sticky; top:0; z-index:10;
}
.brand{
  color:#e6eef8; font-weight:800; letter-spacing:.3px; text-decoration:none; font-size:18px;
}
.topnav a{ color:#cfe0ff; text-decoration:none; margin-left:14px }
.topnav .btn{
  background:#2554ff; color:#fff; padding:8px 12px; border-radius:10px; font-weight:700
}
.cart-link{ position:relative; padding-right:14px }
.badge{
  position:absolute; top:-6px; right:0; background:#ef4444; color:#fff;
  border-radius:999px; padding:2px 6px; font-size:12px; font-weight:800;
}

/* ===== Theme ===== */
:root{
  --bg:#0b1220;
  --panel:#0f1629;
  --muted:#90a4b7;
  --ink:#e6eef8;
  --accent:#4f8cff;
  --accent-2:#7aa5ff;
  --edge:#1c2742;
}
*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  font:16px/1.5 Inter, ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  color:var(--ink);
  background:radial-gradient(1200px 600px at 70% -20%, #1a2a4a 0%, transparent 60%) , var(--bg);
}

/* ===== Layout ===== */
.customize-container{
  max-width:1280px; margin:24px auto; padding:0 20px;
  display:grid; grid-template-columns:1.35fr 1fr; gap:22px;
}
@media (max-width: 980px){ .customize-container{ grid-template-columns:1fr; } }

.panel{
  background:linear-gradient(180deg, #0e1730 0%, #0d1426 100%);
  border:1px solid var(--edge);
  border-radius:16px;
  box-shadow:0 12px 50px rgba(10,16,35,.45), inset 0 1px 0 rgba(255,255,255,.03);
}

.preview-section{ padding:18px }
.controls-section{ padding:18px }

/* ===== Preview ===== */
.preview-head{
  display:flex; align-items:center; justify-content:space-between; margin-bottom:12px
}
.preview-title{ font-weight:700; letter-spacing:.2px }
.preview-helpers{ display:flex; gap:10px; align-items:center; color:var(--muted); font-size:12px }

.preview-stage{
  position:relative;
  height:640px;
  background:conic-gradient(from 180deg at 50% 50%, #0c1326, #0d162c, #0c1326);
  border:1px solid var(--edge); border-radius:14px;
  display:flex; align-items:center; justify-content:center; overflow:hidden;
}

.paper{
  --paper-w:520px;
  width:var(--paper-w);
  aspect-ratio: 210 / 297; /* A4 portrait default */
  background:#fff;
  border-radius:6px;
  box-shadow:0 16px 60px rgba(0,0,0,.45), 0 1px 0 rgba(0,0,0,.5) inset;
  display:flex; align-items:center; justify-content:center; overflow:hidden;
}
.paper-inner{
  width:100%; height:100%; display:flex; align-items:center; justify-content:center;
}
.paper-inner img, .paper-inner canvas{
  max-width:100%; max-height:100%; object-fit:contain; display:block;
  transition:filter .18s ease, transform .18s ease;
}
.preview-placeholder{ color:#95a9c6; font-size:14px }

.preview-meta{
  position:absolute; left:12px; bottom:10px; font-size:12px; color:#c8d6e8; opacity:.9;
  display:flex; gap:10px; align-items:center;
}
.preview-nav{
  position:absolute; right:12px; bottom:10px; display:flex; gap:6px;
}
.icon-btn{
  background:#111a33; border:1px solid var(--edge); color:#cfe0ff;
  border-radius:10px; padding:8px 10px; cursor:pointer; font-size:12px;
}
.icon-btn:disabled{ opacity:.5; cursor:not-allowed }

.price-wrap{ margin-top:12px }
.price-pill{
  background:linear-gradient(90deg, var(--accent), var(--accent-2));
  color:#06122c; font-weight:900; border-radius:999px; padding:10px 14px; display:inline-block; letter-spacing:.3px;
}

/* ===== Controls ===== */
.controls-title{ margin:0 0 12px; font-weight:800 }

.control-group{
  border:1px solid var(--edge); border-radius:14px; padding:14px; margin-bottom:14px;
  background:linear-gradient(180deg, rgba(255,255,255,.03), rgba(255,255,255,.01));
}
.control-group h4{ margin:0 0 10px; font-size:14px; color:#c9d7eb; letter-spacing:.2px }

.row{ display:grid; grid-template-columns:1fr 1fr; gap:10px }
@media (max-width: 520px){ .row{ grid-template-columns:1fr } }

label{ font-size:12px; color:var(--muted) }
select,input[type="number"],input[type="file"],textarea,input[type="text"],input[type="email"]{
  width:100%; margin-top:6px;
  background:#0b1328; color:#eaf1ff;
  border:1px solid #223159; border-radius:10px;
  padding:10px 12px; outline:none;
}
select:focus,input:focus,textarea:focus{ border-color:#365da7; box-shadow:0 0 0 3px rgba(79,140,255,.15) }
.muted{ color:var(--muted); font-size:12px }

.submit-btn{
  width:100%; padding:14px 16px; border-radius:12px; border:1px solid #4476e6;
  background:linear-gradient(180deg, #3f7cff, #2e63d8);
  color:#fff; font-weight:800; letter-spacing:.3px; cursor:pointer;
  box-shadow:0 10px 30px rgba(79,140,255,.35);
}
.submit-btn:hover{ filter:brightness(1.06) }