body {
  min-height: 100vh;
  margin: 0;
  background: radial-gradient(ellipse 64rem 30rem at 50% -6rem, var(--theme-bg-glow), transparent 76%), var(--theme-bg);
  color: var(--theme-text);
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.6;
}

.qr-tool-shell { width: min(1280px, calc(100% - 32px)); margin: 0 auto; padding: 24px 0 48px; }
.qr-tool-noscript { margin: 0 0 16px; padding: 12px 14px; border: 1px solid var(--theme-warning); border-radius: 10px; color: var(--theme-text); background: var(--theme-panel-soft); }
.qr-tool-breadcrumbs { margin: 0 0 20px; color: var(--theme-muted); font-size: 14px; }
.qr-tool-breadcrumbs ol { display: flex; flex-wrap: wrap; gap: 8px; margin: 0; padding: 0; list-style: none; }
.qr-tool-breadcrumbs li:not(:last-child)::after { content: '/'; margin-left: 8px; color: var(--theme-subtle); }
.qr-tool-breadcrumbs a { color: var(--theme-link); }
.qr-tool-header { display: flex; align-items: center; gap: 12px; margin-bottom: 18px; }
.qr-tool-header .brand { color: var(--theme-text); font-size: 20px; font-weight: 800; text-decoration: none; }
.qr-tool-header nav { display: flex; flex-wrap: wrap; gap: 12px; margin-left: auto; }
.qr-tool-header nav a { color: var(--theme-link); font-size: 14px; }
.qr-tool-header .theme-toggle { flex: 0 0 auto; }
.qr-tool-intro { max-width: 900px; margin-bottom: 20px; }
.qr-tool-intro h1 { margin: 0 0 8px; font-size: clamp(28px, 5vw, 44px); line-height: 1.12; }
.qr-tool-intro p { color: var(--theme-muted); font-size: 17px; margin: 0; }
.qr-tool-layout { display: grid; grid-template-columns: minmax(0, 1.65fr) minmax(320px, 1fr); gap: 0; align-items: stretch; border: 1px solid var(--theme-border); border-radius: 22px; background: var(--theme-panel); box-shadow: 0 18px 44px var(--theme-shadow); }
.qr-tool-card, .qr-tool-preview, .qr-tool-content { background: var(--theme-panel); border: 1px solid var(--theme-border); border-radius: 18px; box-shadow: 0 18px 45px var(--theme-shadow); }
.qr-tool-card, .qr-tool-preview { padding: clamp(22px, 3vw, 36px); border: 0; border-radius: 0; background: transparent; box-shadow: none; }
.qr-tool-card { min-width: 0; }
.qr-tool-card h2, .qr-tool-preview h2, .qr-tool-content h2 { margin-top: 0; }
.qr-tool-card label { display: block; margin: 0 0 17px; font-weight: 700; }
.qr-tool-card label[hidden] { display: none; }
.required-label { margin-left: 6px; color: var(--theme-warning); font-size: 12px; font-weight: 700; white-space: nowrap; }
.qr-tool-card .field-error { margin: 6px 0 0; color: var(--theme-danger); font-size: 13px; font-weight: 500; }
.qr-tool-card .field-error[hidden], .qr-tool-preview [hidden] { display: none; }
.password-control { display: flex; gap: 8px; align-items: stretch; margin-top: 7px; }
.password-control input { flex: 1; margin-top: 0; }
.password-control button { min-width: 90px; border: 1px solid var(--theme-border-strong); border-radius: 10px; background: transparent; color: var(--theme-text); font: inherit; font-size: 13px; cursor: pointer; }
.password-control button:disabled { opacity: .55; cursor: not-allowed; }
.qr-tool-card input, .qr-tool-card select { width: 100%; box-sizing: border-box; min-height: 48px; margin-top: 7px; padding: 10px 12px; border: 1px solid var(--theme-border); border-radius: 10px; background: var(--theme-input); color: var(--theme-text); font: inherit; font-size: 16px; }
.qr-tool-card input:focus-visible, .qr-tool-card select:focus-visible, .qr-tool-card button:focus-visible, .qr-tool-card a:focus-visible { outline: 3px solid var(--theme-focus); outline-offset: 2px; }
.qr-tool-card input:disabled { opacity: .6; }
.qr-tool-card fieldset { margin: 0 0 17px; padding: 0; border: 0; }
.qr-tool-card legend { margin-bottom: 7px; font-weight: 700; }
.qr-tool-card .check-row { display: flex; align-items: center; gap: 9px; font-weight: 500; }
.qr-tool-card .check-row input { width: 18px; min-height: 18px; margin: 0; }
.qr-tool-note { margin: 0; color: var(--theme-muted); font-size: 14px; }
.qr-tool-card code, .qr-tool-content code { color: var(--theme-link); }
.qr-tool-actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 22px; }
.qr-tool-actions button, .qr-tool-actions a { display: inline-flex; min-height: 48px; align-items: center; justify-content: center; box-sizing: border-box; padding: 9px 15px; border-radius: 10px; font: inherit; font-weight: 750; text-decoration: none; cursor: pointer; }
.qr-tool-actions button[type="submit"] { display: inline-flex; flex: 1 1 auto; align-items: center; justify-content: center; gap: 9px; border: 1px solid var(--theme-accent); background: var(--theme-accent); color: #fff; }
.action-step { display: inline-grid; flex: 0 0 24px; place-items: center; width: 24px; height: 24px; border-radius: 7px; background: rgba(255, 255, 255, .18); font-size: 12px; line-height: 1; }
.qr-tool-actions button[type="submit"]:hover { background: var(--theme-accent-hover); }
.qr-tool-actions .secondary, .qr-tool-actions a { border: 1px solid var(--theme-border-strong); background: transparent; color: var(--theme-text); }
.qr-tool-actions .secondary:hover, .qr-tool-actions a:hover { border-color: var(--theme-link-hover); }
.qr-design-controls { display: grid; gap: 14px; margin-top: 20px; padding: 18px; border: 1px solid var(--theme-border); border-radius: 16px; background: var(--theme-panel-soft); }
.qr-design-heading { display: flex; align-items: flex-start; justify-content: space-between; gap: 12px; }
.qr-design-heading h2 { margin: 0 0 4px; font-size: 17px; }
.qr-design-heading p { margin: 0; color: var(--theme-muted); font-size: 13px; line-height: 1.45; }
.qr-design-heading button { flex: 0 0 auto; min-height: 40px; padding: 7px 10px; border: 1px solid var(--theme-border-strong); border-radius: 9px; background: transparent; color: var(--theme-link); font: inherit; font-size: 12px; font-weight: 700; cursor: pointer; }
.qr-design-controls fieldset { min-width: 0; margin: 0; }
.qr-design-controls legend { margin-bottom: 7px; font-size: 13px; }
.qr-style-options { display: grid; grid-template-columns: repeat(auto-fit, minmax(132px, 1fr)); gap: 8px; }
.qr-style-option { position: relative; display: flex !important; min-width: 0; min-height: 42px; align-items: center; gap: 8px; box-sizing: border-box; margin: 0 !important; padding: 7px 9px; border: 1px solid var(--theme-border); border-radius: 10px; background: var(--theme-panel); color: var(--theme-text); font-size: 12px; line-height: 1.3; cursor: pointer; }
.qr-style-option input[type="radio"] { flex: 0 0 18px; width: 18px; min-height: 18px; margin: 0; accent-color: var(--theme-accent); }
.qr-style-option:focus-within { outline: 3px solid var(--theme-focus); outline-offset: 2px; }
.qr-style-swatch { flex: 0 0 18px; width: 18px; height: 18px; border: 1px solid var(--theme-border-strong); border-radius: 50%; background: var(--swatch); }
.qr-style-label { margin: 0 !important; font-size: 13px; }
.qr-style-label input { margin-top: 6px !important; }
.qr-style-label small { display: block; margin-top: 5px; color: var(--theme-muted); font-size: 12px; font-weight: 400; }
.qr-output-dimensions { margin: -8px 0 8px; color: var(--theme-muted); font-size: 12px; text-align: center; }
.qr-tool-preview { min-width: 0; min-height: 360px; align-self: start; justify-content: center; border-left: 1px solid var(--theme-border); border-radius: 0 21px 21px 0; background: radial-gradient(ellipse at 50% 36%, var(--theme-bg-glow), transparent 72%), var(--theme-panel-soft); text-align: center; }
.qr-tool-preview > h2 { width: 100%; text-align: left; }
.qr-tool-preview img { display: block; width: min(100%, 320px); aspect-ratio: 1; margin: 12px auto 18px; border-radius: 8px; background: #fff; object-fit: contain; image-rendering: pixelated; }
.qr-tool-preview img:not([hidden]) { min-width: 0; }
.qr-tool-preview img:not([hidden]) ~ .qr-tool-placeholder { display: none; }
.qr-tool-placeholder { position: relative; display: grid; width: 112px; aspect-ratio: 1; place-items: center; margin: 14px auto 16px; border: 1px solid var(--theme-border-strong); border-radius: 20px; background: var(--theme-panel); color: var(--theme-subtle); font-size: 14px; font-weight: 800; letter-spacing: .08em; box-shadow: 0 10px 26px var(--theme-shadow); }
.qr-tool-placeholder::before, .qr-tool-placeholder::after { position: absolute; width: 26px; height: 26px; border: 4px solid var(--theme-accent); border-radius: 6px; content: ""; }
.qr-tool-placeholder::before { top: 18px; left: 18px; box-shadow: 74px 0 0 -4px var(--theme-panel), 74px 0 0 0 var(--theme-accent); }
.qr-tool-placeholder::after { bottom: 18px; left: 18px; }
.qr-tool-preview .empty-qr { display: none; }
.qr-tool-normalized { max-width: 100%; margin: 0 0 12px; overflow-wrap: anywhere; color: var(--theme-muted); font-size: 13px; text-align: left; }
.qr-tool-normalized code { color: var(--theme-link); }
.qr-tool-status { min-height: 48px; margin: 0; color: var(--theme-muted); font-size: 14px; }
.qr-tool-status.is-error { color: var(--theme-danger); }
.qr-tool-content { margin-top: 20px; padding: 26px; }
.qr-tool-content h2 { margin-top: 26px; }
.qr-tool-content h2:first-child { margin-top: 0; }
.qr-tool-content a, .qr-tool-footer a { color: var(--theme-link); }
.qr-tool-content .note { padding: 14px 16px; border: 1px solid var(--theme-border-strong); border-radius: 12px; background: var(--theme-panel-soft); }
.qr-tool-footer { margin-top: 28px; color: var(--theme-subtle); font-size: 14px; text-align: center; }
.qr-tool-footer nav { display: flex; justify-content: center; flex-wrap: wrap; gap: 12px; margin: 12px 0; }
.qr-tool-footer p { margin: 8px 0; }

@media (min-width: 961px) { .qr-tool-preview { position: sticky; top: 16px; } }

@media (max-width: 960px) {
  .qr-tool-shell { box-sizing: border-box; width: min(760px, calc(100% - 24px)); padding-top: 14px; }
  .qr-tool-header { display: grid; grid-template-columns: minmax(0, 1fr) auto auto; gap: 8px; margin-bottom: 24px; }
  .qr-tool-header nav { order: 0; width: auto; margin-left: 0; }
  .qr-tool-header .locale-switch { min-height: 44px; }
  .qr-tool-header .locale-switch a { min-height: 44px; padding: 0 10px; }
  .qr-tool-header .theme-toggle { min-height: 44px; padding: 7px 10px; }
  .qr-tool-layout { grid-template-columns: 1fr; }
  .qr-tool-preview { position: static; order: 0; min-height: 300px; border-top: 1px solid var(--theme-border); border-left: 0; border-radius: 0 0 21px 21px; }
  .qr-tool-card { padding: 18px; border-radius: 0; }
  .qr-tool-preview { padding: 18px; border-radius: 0 0 23px 23px; }
  .qr-tool-content { padding: 18px; border-radius: 14px; }
  .qr-tool-actions > * { flex: 1 1 180px; }
}

@media (max-width: 420px) {
  .qr-tool-shell { width: calc(100% - 20px); }
  .qr-tool-header { margin-bottom: 18px; }
  .qr-tool-intro p { font-size: 15px; }
  .qr-design-controls { padding: 14px; }
  .qr-design-heading { flex-direction: column; }
  .qr-design-heading button { width: 100%; }
  .qr-tool-actions > * { flex-basis: 100%; }
}

@media (max-width: 360px) {
  .qr-tool-header .brand { grid-column: 1 / -1; }
  .qr-tool-header .theme-toggle { grid-column: 2; }
  .qr-tool-header .locale-switch { grid-column: 3; }
}

@media print {
  .qr-tool-header, .tool-type-nav, .resource-nav, .theme-toggle, .qr-tool-card, .qr-tool-content, .qr-tool-footer { display: none !important; }
  .qr-tool-preview { border: 0; box-shadow: none; }
}