/* =========================================================
   QRForge — BARCODES (fully self-contained stylesheet)
   Base design + blueprint skin + footer/extras, merged.
   Linked ONLY by barcodes/index.html. No ../ dependencies.
   ========================================================= */

@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@400;500;600;700&display=swap');

/* ---------- Design tokens ---------- */
:root {
  --bg: #fafafa;
  --surface: #ffffff;
  --surface-2: #f4f4f5;
  --text: #09090b;
  --text-muted: #71717a;
  --border: #e4e4e7;
  --accent: #2563eb;
  --accent-deep: #1e40af;
  --accent-hover: #1d4ed8;
  --accent-subtle: #eff6ff;
  --danger: #dc2626;
  --danger-bg: #fef2f2;
  --success: #16a34a;
  --success-bg: #f0fdf4;
  --radius: 10px;
  --radius-sm: 6px;
  --shadow: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.07), 0 2px 4px -2px rgb(0 0 0 / 0.05);
  --header-h: 64px;
  --font: 'Space Grotesk', ui-sans-serif, system-ui, -apple-system, 'Segoe UI', Roboto, Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
}

html.dark {
  --bg: #09090b;
  --surface: #18181b;
  --surface-2: #27272a;
  --text: #fafafa;
  --text-muted: #a1a1aa;
  --border: #27272a;
  --accent: #3b82f6;
  --accent-deep: #1d4ed8;
  --accent-hover: #60a5fa;
  --accent-subtle: #172554;
  --danger: #ef4444;
  --danger-bg: #450a0a;
  --success: #22c55e;
  --success-bg: #052e16;
  --shadow: 0 1px 2px 0 rgb(0 0 0 / 0.4);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.4), 0 2px 4px -2px rgb(0 0 0 / 0.3);
}

/* ---------- Reset & base (blueprint grid background) ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { font-size: 16px; -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
  font-family: var(--font);
  color: var(--text);
  line-height: 1.5;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  background-color: color-mix(in srgb, var(--accent) 2.5%, var(--surface));
  background-image:
    linear-gradient(rgba(37, 99, 235, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(37, 99, 235, 0.06) 1px, transparent 1px);
  background-size: 20px 20px;
}

::selection { background: rgba(37, 99, 235, 0.18); }

h1, h2, h3, h4 { font-weight: 600; letter-spacing: -0.025em; color: var(--text); }
h1 { font-size: 2.25rem; line-height: 1.2; }
h2 { font-size: 1.5rem; line-height: 1.3; }
h3 { font-size: 1.125rem; line-height: 1.4; }
p { color: var(--text-muted); }

a { color: var(--accent); text-decoration: none; transition: color 0.15s ease; }
a:hover { color: var(--accent-hover); }

.container { width: 100%; max-width: 1120px; margin: 0 auto; padding: 0 1.25rem; }
.container-wide { max-width: 1280px; }

/* ---------- Header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  height: var(--header-h);
  background: var(--surface);
  border-bottom: 2px solid var(--accent);
  box-shadow: 0 2px 0 var(--accent-deep);
  display: flex; align-items: center;
}
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  width: 100%; max-width: 1280px; margin: 0 auto; padding: 0 1.25rem;
}
.logo { display: flex; align-items: center; gap: 0.5rem; font-weight: 700; font-size: 1.125rem; color: var(--text); letter-spacing: -0.03em; }
.logo span { color: var(--accent); }
.logo:hover { color: var(--text); }

.nav { display: flex; align-items: center; gap: 0.25rem; }
.nav a {
  padding: 0.4rem 0.75rem;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--text-muted);
  transition: color 0.15s, border-color 0.15s, box-shadow 0.15s;
}
.nav a:hover { color: var(--accent); border-color: var(--accent); box-shadow: 0 2px 0 var(--accent); }
.nav a.active { background: var(--accent); color: #fff; border-color: var(--accent); box-shadow: 0 2px 0 var(--accent-deep); }

.header-actions { display: flex; align-items: center; gap: 0.5rem; }

.theme-toggle {
  display: inline-flex; align-items: center; justify-content: center;
  width: 36px; height: 36px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text-muted);
  cursor: pointer;
  transition: background 0.15s, color 0.15s, border-color 0.15s;
}
.theme-toggle:hover { background: var(--surface-2); color: var(--text); }
.theme-toggle svg { width: 18px; height: 18px; stroke: currentColor; fill: none; stroke-width: 1.75; stroke-linecap: round; stroke-linejoin: round; }
.theme-toggle .icon-sun { display: none; }
html.dark .theme-toggle .icon-moon { display: none; }
html.dark .theme-toggle .icon-sun { display: block; }

/* ---------- Buttons (sharp, hard-offset shadows) ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 0.4rem;
  padding: 0.55rem 1rem;
  font-size: 0.73rem; font-weight: 700;
  text-transform: uppercase; letter-spacing: 0.055em;
  border-radius: 2px;
  border: 1px solid transparent;
  cursor: pointer; white-space: nowrap; font-family: inherit;
  transition: background 0.15s, border-color 0.15s, color 0.15s, box-shadow 0.15s, transform 0.1s;
}
.btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }
.btn-block { width: 100%; }

.btn-primary { background: var(--accent); border-color: var(--accent-deep); color: #fff; box-shadow: 3px 3px 0 var(--accent-deep); }
.btn-primary:hover:not(:disabled) { transform: translate(-1px, -1px); box-shadow: 4px 4px 0 var(--accent-deep); }
.btn-primary:active:not(:disabled) { transform: translate(2px, 2px); box-shadow: 1px 1px 0 var(--accent-deep); }

.btn-secondary { background: var(--surface); border-color: var(--border); color: var(--text); box-shadow: 2.5px 2.5px 0 var(--border); }
.btn-secondary:hover:not(:disabled) {
  border-color: var(--accent); color: var(--accent);
  box-shadow: 3.5px 3.5px 0 color-mix(in srgb, var(--accent) 35%, var(--border));
  transform: translate(-1px, -1px);
}

html.dark .btn-primary { box-shadow: 3px 3px 0 #172554; }
html.dark .btn-primary:hover:not(:disabled) { box-shadow: 4px 4px 0 #172554; }
html.dark .btn-primary:active:not(:disabled) { box-shadow: 1px 1px 0 #172554; }

/* ---------- Cards (corner brackets) ---------- */
.card {
  position: relative;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}
.card::before, .card::after {
  content: ""; position: absolute;
  width: 14px; height: 14px;
  border: 2px solid var(--accent);
  pointer-events: none;
}
.card::before { top: -2px; left: -2px; border-right: none; border-bottom: none; }
.card::after { bottom: -2px; right: -2px; border-left: none; border-top: none; }

/* ---------- Forms ---------- */
.form-group { margin-bottom: 1.25rem; }
label { display: block; font-size: 0.8125rem; font-weight: 500; color: var(--text); margin-bottom: 0.35rem; }
.hint { font-size: 0.75rem; color: var(--text-muted); margin-top: 0.3rem; }

input[type="text"], input[type="url"], input[type="number"], input[type="color"], select, textarea {
  width: 100%; padding: 0.55rem 0.75rem;
  font-size: 0.875rem; font-family: inherit; color: var(--text);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 2px;
  transition: border-color 0.15s, box-shadow 0.15s;
}
input:focus, select:focus, textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 2.5px rgba(37, 99, 235, 0.14);
}
input[type="color"] { padding: 0.25rem; height: 40px; cursor: pointer; }
select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%2371717a' stroke-width='2'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.75rem center;
  padding-right: 2rem;
}
.input-row { display: grid; grid-template-columns: 1fr 1fr; gap: 0.75rem; }
.color-row { display: flex; align-items: center; gap: 0.75rem; }
.color-row input[type="color"] { width: 48px; flex-shrink: 0; }

/* ---------- Alerts ---------- */
.alert { padding: 0.75rem 1rem; border-radius: 2px; font-size: 0.8125rem; margin-bottom: 1rem; display: none; }
.alert.show { display: block; }
.alert-error { background: var(--danger-bg); color: var(--danger); border: 1px solid var(--danger); }
.alert-success { background: var(--success-bg); color: var(--success); border: 1px solid var(--success); }

/* ---------- Workbench ---------- */
.workbench { display: grid; grid-template-columns: 1fr 340px; gap: 1.5rem; align-items: start; padding: 2rem 0 4rem; }
.config-panel { min-width: 0; }
.preview-panel { position: sticky; top: calc(var(--header-h) + 1.5rem); }
.preview-card { padding: 1.5rem; text-align: center; }
.preview-viewport {
  display: flex; align-items: center; justify-content: center;
  min-height: 240px;
  background-color: var(--surface-2);
  background-image:
    linear-gradient(rgba(37, 99, 235, 0.09) 1px, transparent 1px),
    linear-gradient(90deg, rgba(37, 99, 235, 0.09) 1px, transparent 1px);
  background-size: 12px 12px;
  border: 1px dashed var(--border);
  border-radius: var(--radius-sm);
  box-shadow: inset 0 0 0 1px rgba(37, 99, 235, 0.12);
  margin-bottom: 1.25rem;
  padding: 1.5rem;
}
.preview-viewport svg, .preview-viewport canvas, .preview-viewport img { max-width: 100%; height: auto; }
.preview-actions { display: flex; flex-direction: column; gap: 0.5rem; }
.preview-actions .btn-row { display: grid; grid-template-columns: 1fr 1fr; gap: 0.5rem; }

/* ---------- Intro steps ---------- */
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.5rem; margin: 3rem 0; }
.step { text-align: center; padding: 1.5rem 1rem; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); }
.step-num {
  display: inline-flex; align-items: center; justify-content: center;
  width: 32px; height: 32px;
  background: var(--accent); color: #fff;
  font-size: 0.875rem; font-weight: 700;
  border-radius: 2px;
  box-shadow: 2px 2px 0 var(--accent-deep);
  margin-bottom: 0.75rem;
}
.step h3 { font-size: 1rem; margin-bottom: 0.35rem; }
.step p { font-size: 0.8125rem; }

/* ---------- Tool switcher ---------- */
.switcher-wrap { margin: 0 0 0.5rem; }
.switcher-label { text-align: center; font-size: 0.7rem; font-weight: 700; letter-spacing: 0.12em; text-transform: uppercase; color: var(--text-muted); margin-bottom: 0.65rem; }
.tool-switcher { display: flex; flex-wrap: wrap; justify-content: center; gap: 0.5rem; }
.switch-pill {
  display: inline-flex; align-items: center; gap: 0.3rem;
  padding: 0.4rem 0.85rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 999px;
  font-size: 0.8125rem; font-weight: 600;
  color: var(--text-muted);
  transition: color 0.15s, border-color 0.15s, box-shadow 0.15s, transform 0.15s;
}
.switch-pill:hover { color: var(--accent); border-color: var(--accent); transform: translateY(-1px); }
.switch-pill.switch-active { background: var(--accent); border-color: var(--accent); color: #fff; box-shadow: 2px 2px 0 var(--accent-deep); }

/* ---------- Info block ---------- */
.info-block { margin-top: 2.5rem; padding: 1.5rem; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); }
.info-block h3 { margin-bottom: 0.75rem; font-size: 1rem; }
.info-block p { font-size: 0.875rem; margin-bottom: 0.5rem; }
.info-block p:last-child { margin-bottom: 0; }

/* ---------- Content sections (SEO blocks) ---------- */
.content-sections { display: grid; gap: 2.75rem; padding: 0 0 4rem; }
.cs-block h2 { font-size: 1.375rem; border-left: 3px solid var(--accent); padding-left: 0.85rem; margin-bottom: 1.25rem; }
.cs-steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.25rem; }
.cs-step { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 1.25rem; }
.cs-step .n {
  display: inline-flex; align-items: center; justify-content: center;
  width: 26px; height: 26px;
  background: var(--accent); color: #fff;
  font-size: 0.8rem; font-weight: 700;
  border-radius: 2px;
  box-shadow: 2px 2px 0 var(--accent-deep);
  margin-bottom: 0.6rem;
}
.cs-step h3 { font-size: 0.95rem; margin-bottom: 0.3rem; }
.cs-step p { font-size: 0.8125rem; }

.cs-list { list-style: none; display: grid; gap: 0.65rem; }
.cs-list li { position: relative; padding-left: 1.4rem; font-size: 0.9375rem; color: var(--text-muted); }
.cs-list li::before { content: ""; position: absolute; left: 0; top: 0.45em; width: 7px; height: 7px; background: var(--accent); }

.cs-faq details { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); margin-bottom: 0.5rem; overflow: hidden; }
.cs-faq summary {
  cursor: pointer; list-style: none;
  display: flex; align-items: center; justify-content: space-between; gap: 1rem;
  padding: 0.9rem 1.1rem;
  font-weight: 600; font-size: 0.9375rem; color: var(--text);
}
.cs-faq summary::-webkit-details-marker { display: none; }
.cs-faq summary::after { content: "+"; color: var(--accent); font-size: 1.1rem; font-weight: 700; flex: none; }
.cs-faq details[open] summary::after { content: "–"; }
.cs-faq details[open] summary { border-bottom: 1px dashed var(--border); }
.cs-faq p { padding: 0.9rem 1.1rem 1rem; font-size: 0.9375rem; }

/* ---------- Footer ---------- */
.ftr { margin-top: 4rem; background: var(--surface); border-top: 1px solid var(--border); }
.qf-ftr-stripe { height: 6px; background: repeating-linear-gradient(90deg, var(--accent) 0 6px, transparent 6px 12px); opacity: 0.85; }
.ftr-inner { max-width: 1280px; margin: 0 auto; padding: 2.5rem 1.25rem 2rem; display: grid; grid-template-columns: 1.6fr 1fr 1fr 1fr; gap: 2rem; }
.ftr-brand { font-weight: 700; font-size: 1.125rem; margin-bottom: 0.5rem; }
.ftr-brand span { color: var(--accent); }
.ftr-tag { font-size: 0.8125rem; color: var(--text-muted); line-height: 1.55; max-width: 300px; margin-bottom: 1rem; }
.qf-badges { display: flex; flex-wrap: wrap; gap: 0.5rem; }
.qf-badge { font-size: 0.75rem; font-weight: 600; padding: 0.3rem 0.6rem; border: 1px solid var(--border); border-radius: 4px; background: var(--surface-2); color: var(--text-muted); }
.ftr-col h4 { font-size: 0.75rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.09em; margin-bottom: 0.75rem; }
.ftr-col a { display: block; font-size: 0.8125rem; color: var(--text-muted); padding: 0.18rem 0; }
.ftr-col a:hover { color: var(--accent); }
.ftr-bottom { border-top: 1px solid var(--border); }
.ftr-bottom-inner { max-width: 1280px; margin: 0 auto; padding: 1rem 1.25rem; display: flex; justify-content: space-between; flex-wrap: wrap; gap: 0.5rem; font-size: 0.75rem; color: var(--text-muted); }

/* ---------- Back to top ---------- */
#qf-to-top {
  position: fixed; right: 1.25rem; bottom: 1.25rem; z-index: 60;
  width: 42px; height: 42px;
  background: var(--surface); color: var(--text);
  border: 1px solid var(--border); border-radius: 4px;
  font-size: 1.05rem; font-weight: 700; cursor: pointer;
  box-shadow: 2.5px 2.5px 0 var(--border);
  opacity: 0; visibility: hidden; transform: translateY(6px);
  transition: opacity 0.2s, transform 0.2s, visibility 0.2s, border-color 0.15s, color 0.15s, box-shadow 0.15s;
}
#qf-to-top.show { opacity: 1; visibility: visible; transform: none; }
#qf-to-top:hover { border-color: var(--accent); color: var(--accent); box-shadow: 3.5px 3.5px 0 color-mix(in srgb, var(--accent) 35%, var(--border)); }

/* ---------- Responsive ---------- */
@media (max-width: 860px) {
  .workbench { grid-template-columns: 1fr; }
  .preview-panel { position: static; }
  .ftr-inner { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 640px) {
  .nav { display: none; }
  .steps, .cs-steps { grid-template-columns: 1fr; }
  .input-row { grid-template-columns: 1fr; }
  .ftr-inner { grid-template-columns: 1fr; gap: 1.75rem; }
  .ftr-bottom-inner { flex-direction: column; }
}