* { box-sizing: border-box; }
body { margin: 0; background: #eef3f7; color: #14283e; font: 16px/1.5 system-ui, sans-serif; }
header { background: #14283e; color: white; padding: 16px max(24px, calc((100vw - 1080px)/2)); display: flex; gap: 18px; align-items: center; }
header strong { font-size: 21px; }
header span { background: #304763; border-radius: 4px; padding: 2px 8px; font-size: 13px; }
main { max-width: 1128px; margin: auto; padding: 24px; }
h1 { margin: 0; font-size: clamp(28px, 5vw, 42px); }
h2 { font-size: 20px; margin-top: 0; }
form { display: grid; grid-template-columns: 1.3fr 1fr; gap: 20px; }
section { background: white; padding: 20px; border: 1px solid #d0dce7; border-radius: 12px; min-width: 0; }
section p { color: #465d73; }
canvas { display: block; width: 100%; height: auto; background: #e9eef3; border: 1px solid #d0dce7; margin: 14px 0; touch-action: none; cursor: crosshair; }
label { display: grid; gap: 4px; margin-bottom: 12px; font-weight: 600; }
.upload { margin-top: 12px; }
input, textarea, button { font: inherit; }
input, textarea { min-width: 0; max-width: 100%; border: 1px solid #8298ab; border-radius: 5px; padding: 7px; }
button { cursor: pointer; border: 1px solid #8298ab; color: #14283e; background: white; border-radius: 5px; padding: 7px 12px; }
button.primary { background: #155e8d; border-color: #155e8d; color: white; font-weight: 700; }
button:disabled { opacity: .6; cursor: wait; }
@media (max-width: 760px) { form { grid-template-columns: 1fr; } }