:root {
  --qr-primary:   #2563eb;
  --qr-secondary: #7c3aed;
  --qr-dark:      #0f172a;
  --qr-surface:   #ffffff;
  --qr-muted:     #64748b;
  --qr-border:    #e2e8f0;
  --qr-radius:    16px;
}

/* ── HUB TOPBAR ──────────────────────────────────── */
.hub-topbar {
  background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
  padding: 10px 0;
  border-bottom: 1px solid rgba(255,255,255,.08);
}
.hub-topbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
}
.hub-topbar-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: #fff;
  font-weight: 700;
  font-size: .95rem;
  letter-spacing: -.01em;
}
.hub-topbar-icon {
  width: 28px; height: 28px;
  border-radius: 8px;
  background: linear-gradient(145deg, var(--qr-primary), var(--qr-secondary));
  display: flex; align-items: center; justify-content: center;
  font-size: .75rem; font-weight: 900; color: #fff;
}
.hub-topbar-links {
  display: flex; gap: 6px; flex-wrap: wrap;
}
.hub-topbar-links a {
  font-size: .78rem;
  color: rgba(255,255,255,.7);
  text-decoration: none;
  padding: 3px 10px;
  border-radius: 20px;
  border: 1px solid rgba(255,255,255,.12);
  transition: all .2s;
}
.hub-topbar-links a:hover { color: #fff; background: rgba(255,255,255,.08); }

/* ── TOOL NAVBAR ─────────────────────────────────── */
.qr-navbar {
  background: #fff;
  border-bottom: 1px solid var(--qr-border);
  padding: 0;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 1px 8px rgba(0,0,0,.06);
}
.qr-navbar .navbar-brand {
  display: flex; align-items: center; gap: 10px;
  font-weight: 800; font-size: 1.15rem;
  color: var(--qr-dark); letter-spacing: -.02em;
}
.qr-brand-icon {
  width: 36px; height: 36px;
  border-radius: 10px;
  background: linear-gradient(145deg, var(--qr-primary), var(--qr-secondary));
  display: flex; align-items: center; justify-content: center;
  color: #fff; font-size: 1.1rem;
}
.qr-navbar .nav-link {
  color: var(--qr-muted) !important;
  font-weight: 500; font-size: .9rem;
  padding: 1rem .8rem !important;
  transition: color .2s;
  position: relative;
}
.qr-navbar .nav-link:hover,
.qr-navbar .nav-link.active { color: var(--qr-primary) !important; }
.qr-navbar .nav-link.active::after {
  content: '';
  position: absolute; bottom: -1px; left: .8rem; right: .8rem; height: 2px;
  background: var(--qr-primary); border-radius: 2px 2px 0 0;
}

/* ── HERO ────────────────────────────────────────── */
.qr-hero {
  background: linear-gradient(135deg, #eff6ff 0%, #f5f3ff 50%, #faf5ff 100%);
  padding: 64px 0 56px;
  border-bottom: 1px solid var(--qr-border);
}
.qr-hero-badge {
  display: inline-block;
  background: rgba(37,99,235,.1);
  color: var(--qr-primary);
  font-size: .78rem; font-weight: 700;
  padding: 5px 14px;
  border-radius: 20px;
  margin-bottom: 18px;
  border: 1px solid rgba(37,99,235,.15);
}
.qr-hero-title {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 900;
  color: var(--qr-dark);
  letter-spacing: -.04em;
  line-height: 1.1;
  margin-bottom: 16px;
}
.qr-hero-sub {
  font-size: 1.1rem;
  color: var(--qr-muted);
  max-width: 520px;
  margin: 0 auto;
  line-height: 1.6;
}

/* ── TOOL SECTION ────────────────────────────────── */
.qr-tool-section { padding: 56px 0; background: #f8fafc; }

.qr-tool-wrap {
  display: grid;
  grid-template-columns: 1fr 400px;
  gap: 32px;
  align-items: start;
}
@media (max-width: 991px) {
  .qr-tool-wrap { grid-template-columns: 1fr; }
}

/* ── INPUT PANEL ─────────────────────────────────── */
.qr-input-panel {
  background: #fff;
  border-radius: var(--qr-radius);
  border: 1px solid var(--qr-border);
  padding: 28px;
  box-shadow: 0 2px 16px rgba(0,0,0,.05);
}

/* Type selector grid */
.qr-type-grid {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 8px;
  margin-bottom: 24px;
}
@media (max-width: 600px) {
  .qr-type-grid { grid-template-columns: repeat(4, 1fr); }
}
.qr-type-btn {
  display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  gap: 4px;
  padding: 10px 4px;
  border: 2px solid var(--qr-border);
  border-radius: 12px;
  background: #f8fafc;
  color: var(--qr-muted);
  cursor: pointer;
  font-size: .75rem; font-weight: 600;
  transition: all .2s;
}
.qr-type-btn i { font-size: 1.2rem; }
.qr-type-btn:hover { border-color: var(--qr-primary); color: var(--qr-primary); background: #eff6ff; }
.qr-type-btn.active {
  border-color: var(--qr-primary);
  background: linear-gradient(135deg, #eff6ff, #f5f3ff);
  color: var(--qr-primary);
  box-shadow: 0 2px 8px rgba(37,99,235,.15);
}

/* Forms */
.qr-forms { margin-bottom: 24px; }
.qr-form { display: none; }
.qr-form.active { display: block; }

.qr-label {
  display: block;
  font-size: .8rem;
  font-weight: 700;
  color: #374151;
  margin-bottom: 6px;
  text-transform: uppercase;
  letter-spacing: .04em;
}
.qr-input {
  width: 100%;
  padding: 10px 14px;
  border: 2px solid var(--qr-border);
  border-radius: 10px;
  font-size: .95rem;
  color: var(--qr-dark);
  background: #f8fafc;
  transition: border-color .2s, box-shadow .2s;
  outline: none;
}
.qr-input:focus {
  border-color: var(--qr-primary);
  box-shadow: 0 0 0 3px rgba(37,99,235,.1);
  background: #fff;
}
.qr-textarea { resize: vertical; min-height: 100px; }
.qr-hint { font-size: .78rem; color: var(--qr-muted); margin-top: 5px; }

/* Customizer */
.qr-customizer {
  background: #f8fafc;
  border: 1px solid var(--qr-border);
  border-radius: 12px;
  padding: 18px;
  margin-bottom: 20px;
}
.qr-customizer-title {
  font-size: .85rem; font-weight: 700;
  color: var(--qr-dark); margin-bottom: 14px;
}
.qr-custom-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}
.qr-color-wrap {
  display: flex; align-items: center; gap: 10px;
}
.qr-color-input {
  width: 44px; height: 36px;
  border: 2px solid var(--qr-border);
  border-radius: 8px;
  padding: 2px; cursor: pointer;
  background: none;
}
.qr-color-label {
  font-size: .85rem; color: var(--qr-muted); font-family: monospace;
}

/* Generate Button */
.qr-generate-btn {
  width: 100%;
  padding: 14px;
  background: linear-gradient(135deg, var(--qr-primary), var(--qr-secondary));
  color: #fff;
  border: none; border-radius: 12px;
  font-size: 1rem; font-weight: 700;
  cursor: pointer;
  transition: all .25s;
  display: flex; align-items: center; justify-content: center;
  gap: 6px;
  box-shadow: 0 4px 16px rgba(37,99,235,.3);
}
.qr-generate-btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 8px 24px rgba(37,99,235,.4);
}
.qr-generate-btn:active { transform: translateY(0); }

/* ── PREVIEW PANEL ───────────────────────────────── */
.qr-preview-panel { position: sticky; top: 80px; }

.qr-preview-card {
  background: #fff;
  border: 1px solid var(--qr-border);
  border-radius: var(--qr-radius);
  padding: 28px;
  text-align: center;
  box-shadow: 0 2px 16px rgba(0,0,0,.05);
  margin-bottom: 16px;
}
.qr-preview-label {
  font-size: .78rem; font-weight: 700;
  color: var(--qr-muted); text-transform: uppercase;
  letter-spacing: .06em; margin-bottom: 20px;
}
.qr-canvas-wrap {
  background: #f8fafc;
  border: 2px dashed var(--qr-border);
  border-radius: 12px;
  padding: 24px;
  display: flex; align-items: center; justify-content: center;
  min-height: 200px;
  margin-bottom: 20px;
  transition: border-color .3s;
}
.qr-canvas-wrap.has-qr {
  border-style: solid;
  border-color: var(--qr-border);
  background: #fff;
}

.qr-placeholder { text-align: center; color: #cbd5e1; }
.qr-placeholder i { font-size: 4rem; display: block; margin-bottom: 12px; }
.qr-placeholder p { font-size: .85rem; color: var(--qr-muted); }

#qrCanvas { display: flex; justify-content: center; }
#qrCanvas img, #qrCanvas canvas {
  border-radius: 4px;
  max-width: 100%;
}

.qr-actions { display: flex; gap: 10px; margin-bottom: 14px; }
.qr-action-btn {
  flex: 1; padding: 10px;
  border-radius: 10px; border: none;
  font-size: .875rem; font-weight: 700;
  cursor: pointer; transition: all .2s;
  display: flex; align-items: center; justify-content: center; gap: 5px;
}
.qr-download-btn {
  background: linear-gradient(135deg, var(--qr-primary), var(--qr-secondary));
  color: #fff;
  box-shadow: 0 3px 10px rgba(37,99,235,.3);
}
.qr-download-btn:hover { transform: translateY(-1px); box-shadow: 0 6px 16px rgba(37,99,235,.4); }
.qr-copy-btn { background: #f1f5f9; color: var(--qr-dark); border: 1px solid var(--qr-border); }
.qr-copy-btn:hover { background: #e2e8f0; }

.qr-preview-meta {
  display: flex; gap: 8px; justify-content: center;
  font-size: .75rem; color: var(--qr-muted);
}
.qr-preview-meta span {
  background: #f1f5f9; padding: 3px 10px; border-radius: 20px;
}

/* Tips Card */
.qr-tips-card {
  background: #fff;
  border: 1px solid var(--qr-border);
  border-radius: var(--qr-radius);
  padding: 20px;
}
.qr-tips-title {
  font-size: .875rem; font-weight: 700;
  color: var(--qr-dark); margin-bottom: 12px;
}
.qr-tips-list {
  list-style: none; padding: 0; margin: 0;
}
.qr-tips-list li {
  font-size: .825rem; color: var(--qr-muted);
  padding: 6px 0; border-bottom: 1px solid var(--qr-border);
  line-height: 1.5;
}
.qr-tips-list li:last-child { border-bottom: none; }

/* ── HOW IT WORKS ────────────────────────────────── */
.qr-how-section {
  padding: 80px 0;
  background: #fff;
}
.qr-section-badge {
  display: inline-block;
  background: rgba(37,99,235,.08);
  color: var(--qr-primary);
  font-size: .78rem; font-weight: 700;
  padding: 5px 14px; border-radius: 20px;
  margin-bottom: 12px;
  border: 1px solid rgba(37,99,235,.12);
}
.qr-section-title {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 800;
  color: var(--qr-dark);
  letter-spacing: -.03em;
}

.qr-step-card {
  text-align: center;
  padding: 36px 24px;
  border-radius: var(--qr-radius);
  border: 1px solid var(--qr-border);
  background: #fff;
  position: relative;
  transition: box-shadow .25s, transform .25s;
}
.qr-step-card:hover {
  box-shadow: 0 8px 32px rgba(0,0,0,.1);
  transform: translateY(-3px);
}
.qr-step-num {
  position: absolute; top: -14px; left: 50%; transform: translateX(-50%);
  width: 28px; height: 28px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--qr-primary), var(--qr-secondary));
  color: #fff; font-size: .8rem; font-weight: 900;
  display: flex; align-items: center; justify-content: center;
}
.qr-step-icon {
  width: 60px; height: 60px;
  border-radius: 16px;
  background: linear-gradient(135deg, #eff6ff, #f5f3ff);
  display: flex; align-items: center; justify-content: center;
  margin: 0 auto 16px;
  font-size: 1.6rem;
  color: var(--qr-primary);
}
.qr-step-card h5 { font-weight: 700; color: var(--qr-dark); margin-bottom: 8px; }
.qr-step-card p { font-size: .875rem; color: var(--qr-muted); margin: 0; }

/* ── USE CASES ───────────────────────────────────── */
.qr-uses-section { padding: 80px 0; background: #f8fafc; }

.qr-usecase-card {
  background: #fff;
  border-radius: 14px;
  border: 1px solid var(--qr-border);
  padding: 22px;
  height: 100%;
  transition: box-shadow .25s, transform .25s;
}
.qr-usecase-card:hover {
  box-shadow: 0 6px 24px rgba(0,0,0,.09);
  transform: translateY(-2px);
}
.qr-usecase-icon {
  width: 44px; height: 44px;
  border-radius: 12px;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.25rem;
  margin-bottom: 12px;
}
.qr-usecase-card h6 { font-weight: 700; color: var(--qr-dark); margin-bottom: 6px; }

/* ── FAQ ─────────────────────────────────────────── */
.qr-faq-section { padding: 80px 0; background: #fff; }

.qr-faq-item {
  border: 1px solid var(--qr-border) !important;
  border-radius: 12px !important;
  margin-bottom: 10px;
  overflow: hidden;
}
.qr-faq-item .accordion-button {
  font-weight: 600; font-size: .95rem;
  background: #fff; color: var(--qr-dark);
  box-shadow: none !important;
}
.qr-faq-item .accordion-button:not(.collapsed) {
  background: #f8fafc; color: var(--qr-primary);
}
.qr-faq-item .accordion-button::after {
  filter: none;
}
.qr-faq-item .accordion-body {
  border-top: 1px solid var(--qr-border); font-size: .9rem;
}

/* ── CTA SECTION ─────────────────────────────────── */
.qr-cta-section {
  padding: 80px 0;
  background: linear-gradient(135deg, var(--qr-primary), var(--qr-secondary));
  color: #fff;
}
.qr-cta-section h2 { font-weight: 900; font-size: 2rem; margin-bottom: 12px; letter-spacing: -.03em; }
.qr-cta-section p { font-size: 1.05rem; opacity: .85; margin-bottom: 28px; }

/* ── FOOTER ──────────────────────────────────────── */
.qr-footer {
  background: #0f172a;
  color: rgba(255,255,255,.6);
  padding: 40px 0 24px;
  border-top: 1px solid rgba(255,255,255,.08);
}
.qr-footer-brand { color: #fff; font-weight: 700; font-size: 1rem; margin-bottom: 4px; }
.qr-footer-sub { font-size: .8rem; }
.qr-footer a { color: rgba(255,255,255,.6); text-decoration: none; font-size: .875rem; transition: color .2s; }
.qr-footer a:hover { color: #fff; }
.qr-footer-divider { border-color: rgba(255,255,255,.08) !important; margin: 24px 0 20px; }
.qr-footer-copy { font-size: .8rem; }

/* ── UTILITIES ───────────────────────────────────── */
.fw-600 { font-weight: 600; }
.mt-3 { margin-top: 1rem; }

/* Toast notification */
.qr-toast {
  position: fixed; bottom: 24px; right: 24px;
  background: var(--qr-dark); color: #fff;
  padding: 12px 20px;
  border-radius: 10px;
  font-size: .875rem; font-weight: 600;
  box-shadow: 0 8px 24px rgba(0,0,0,.2);
  transform: translateY(80px);
  opacity: 0;
  transition: all .3s ease;
  z-index: 9999;
  display: flex; align-items: center; gap: 8px;
}
.qr-toast.show { transform: translateY(0); opacity: 1; }
.qr-toast.success { border-left: 3px solid #10b981; }
.qr-toast.error   { border-left: 3px solid #ef4444; }