/* ==========================================================================
   QR3D Studio - Modern Micro-SaaS Theme
   ========================================================================== */

:root {
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --primary-light: #eff6ff;
  --accent: #f59e0b;
  --bg: #0f172a;
  --surface: #1e293b;
  --surface-alt: #334155;
  --surface-light: #f8fafc;
  --border: #334155;
  --border-light: #e2e8f0;
  --text: #f8fafc;
  --text-muted: #94a3b8;
  --text-dark: #0f172a;
  --success: #10b981;
  --radius: 12px;
  --shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.3), 0 8px 10px -6px rgba(0, 0, 0, 0.3);
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.12);
  --font: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font);
  background-color: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a {
  color: #38bdf8;
  text-decoration: none;
  transition: color 0.2s;
}
a:hover {
  color: #7dd3fc;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* ==========================================================================
   Header & Hero
   ========================================================================== */
header {
  border-bottom: 1px solid var(--border);
  background: rgba(15, 23, 42, 0.85);
  backdrop-filter: blur(12px);
  position: sticky;
  top: 0;
  z-index: 50;
  padding: 16px 0;
}

.nav-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: -0.5px;
  color: #fff;
}

.logo-icon {
  background: linear-gradient(135deg, #38bdf8, #2563eb);
  width: 38px;
  height: 38px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.4);
}

.badge-tag {
  background: #1e293b;
  border: 1px solid #38bdf8;
  color: #38bdf8;
  font-size: 0.72rem;
  font-weight: 700;
  padding: 3px 8px;
  border-radius: 20px;
  text-transform: uppercase;
}

.hero-section {
  padding: 40px 0 24px;
  text-align: center;
}

.hero-title {
  font-size: 2.5rem;
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 14px;
  background: linear-gradient(135deg, #ffffff 40%, #94a3b8);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-desc {
  font-size: 1.1rem;
  color: var(--text-muted);
  max-width: 780px;
  margin: 0 auto 24px;
}

.trust-badges {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 16px;
  margin-bottom: 30px;
}

.trust-item {
  display: flex;
  align-items: center;
  gap: 6px;
  background: rgba(30, 41, 59, 0.7);
  border: 1px solid var(--border);
  padding: 6px 14px;
  border-radius: 30px;
  font-size: 0.85rem;
  color: #cbd5e1;
}

/* ==========================================================================
   Tool Workspace (Above the Fold)
   ========================================================================== */
.studio-grid {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 28px;
  margin-bottom: 40px;
}

@media (max-width: 992px) {
  .studio-grid {
    grid-template-columns: 1fr;
  }
}

.panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
}

.panel-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
  border-bottom: 1px solid var(--border);
  padding-bottom: 12px;
}

.panel-title {
  font-size: 1.15rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 8px;
}

/* Controls */
.control-group {
  margin-bottom: 20px;
}

.control-label {
  display: block;
  font-size: 0.88rem;
  font-weight: 600;
  margin-bottom: 8px;
  color: #cbd5e1;
}

.input-with-action {
  display: flex;
  gap: 8px;
}

.text-input {
  width: 100%;
  padding: 12px 14px;
  background: #0f172a;
  border: 1px solid var(--border);
  border-radius: 8px;
  color: #fff;
  font-size: 0.95rem;
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.text-input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.25);
}

.action-btn-sm {
  background: var(--surface-alt);
  color: #fff;
  border: 1px solid var(--border);
  padding: 0 14px;
  border-radius: 8px;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: all 0.2s;
}
.action-btn-sm:hover {
  background: #475569;
  border-color: #64748b;
}

/* Format Cards */
.format-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
}

.format-card {
  background: #0f172a;
  border: 1.5px solid var(--border);
  border-radius: 10px;
  padding: 12px 8px;
  text-align: center;
  cursor: pointer;
  transition: all 0.2s;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
}

.format-card:hover {
  border-color: #64748b;
  transform: translateY(-2px);
}

.format-card.active {
  background: rgba(37, 99, 235, 0.15);
  border-color: var(--primary);
  box-shadow: 0 0 0 2px rgba(37, 99, 235, 0.4);
}

.format-icon {
  font-size: 1.6rem;
}

.format-title {
  font-size: 0.85rem;
  font-weight: 700;
  color: #fff;
}

.format-sub {
  font-size: 0.72rem;
  color: var(--text-muted);
}

/* Color Controls */
.color-picker-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-bottom: 12px;
}

.color-box-picker {
  display: flex;
  align-items: center;
  gap: 10px;
  background: #0f172a;
  border: 1px solid var(--border);
  padding: 8px 12px;
  border-radius: 8px;
}

.color-box-picker input[type="color"] {
  -webkit-appearance: none;
  border: none;
  width: 32px;
  height: 32px;
  border-radius: 6px;
  cursor: pointer;
  background: none;
}

.color-box-picker input[type="color"]::-webkit-color-swatch-wrapper {
  padding: 0;
}
.color-box-picker input[type="color"]::-webkit-color-swatch {
  border: 1px solid rgba(255,255,255,0.2);
  border-radius: 6px;
}

.color-box-info {
  display: flex;
  flex-direction: column;
}

.color-box-label {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.color-box-hex {
  font-size: 0.88rem;
  font-family: monospace;
  font-weight: 700;
  color: #fff;
}

.presets-container {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.presets-label {
  font-size: 0.78rem;
  color: var(--text-muted);
}

.color-preset-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: #0f172a;
  border: 1px solid var(--border);
  padding: 4px 8px;
  border-radius: 6px;
  font-size: 0.75rem;
  color: #cbd5e1;
  cursor: pointer;
  transition: all 0.15s;
}
.color-preset-btn:hover {
  border-color: #64748b;
}

.preset-dual-dot {
  display: flex;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  overflow: hidden;
  border: 1px solid rgba(255,255,255,0.3);
}
.preset-half {
  flex: 1;
}

/* Shape & Emoji selectors */
.toggle-pills {
  display: flex;
  gap: 8px;
}

.shape-btn {
  flex: 1;
  padding: 8px 10px;
  background: #0f172a;
  border: 1px solid var(--border);
  color: #cbd5e1;
  border-radius: 6px;
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
}

.shape-btn.active {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
}

.emoji-selector-row {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 8px;
}

.emoji-btn {
  width: 36px;
  height: 36px;
  font-size: 1.2rem;
  background: #0f172a;
  border: 1px solid var(--border);
  border-radius: 6px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.15s;
}
.emoji-btn:hover {
  transform: scale(1.1);
  border-color: #64748b;
}
.emoji-btn.active {
  border-color: var(--primary);
  background: rgba(37, 99, 235, 0.2);
}

/* ==========================================================================
   3D Viewport & Preview
   ========================================================================== */
.viewport-panel {
  display: flex;
  flex-direction: column;
}

.viewport-container {
  position: relative;
  width: 100%;
  height: 440px;
  background: radial-gradient(circle at center, #1e293b 0%, #0f172a 100%);
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
  cursor: grab;
  user-select: none;
}

.viewport-container:active {
  cursor: grabbing;
}

#qrCanvas3d {
  width: 100%;
  height: 100%;
  display: block;
}

.viewport-overlay-top {
  position: absolute;
  top: 12px;
  left: 12px;
  right: 12px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  pointer-events: none;
}

.dimensions-badge {
  background: rgba(15, 23, 42, 0.85);
  border: 1px solid var(--border);
  color: #38bdf8;
  font-family: monospace;
  font-size: 0.78rem;
  padding: 4px 10px;
  border-radius: 6px;
  pointer-events: auto;
}

.reset-cam-btn {
  background: rgba(15, 23, 42, 0.85);
  border: 1px solid var(--border);
  color: #fff;
  padding: 4px 10px;
  border-radius: 6px;
  font-size: 0.78rem;
  cursor: pointer;
  pointer-events: auto;
  transition: all 0.2s;
}
.reset-cam-btn:hover {
  background: #334155;
}

.viewport-overlay-bottom {
  position: absolute;
  bottom: 12px;
  left: 12px;
  right: 12px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  pointer-events: none;
}

.hint-badge {
  background: rgba(15, 23, 42, 0.85);
  color: var(--text-muted);
  font-size: 0.75rem;
  padding: 4px 10px;
  border-radius: 20px;
  border: 1px solid var(--border);
}

.mini-2d-box {
  width: 52px;
  height: 52px;
  background: #fff;
  border: 2px solid var(--border);
  border-radius: 6px;
  overflow: hidden;
  pointer-events: auto;
  box-shadow: 0 4px 10px rgba(0,0,0,0.5);
}
#qrCanvas2d {
  width: 100%;
  height: 100%;
}

/* Download Action Bar */
.download-section {
  margin-top: 20px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.btn-primary-download {
  background: linear-gradient(135deg, #2563eb, #1d4ed8);
  color: #fff;
  border: none;
  padding: 16px 20px;
  border-radius: 10px;
  font-size: 1.05rem;
  font-weight: 700;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  box-shadow: 0 4px 15px rgba(37, 99, 235, 0.4);
  transition: all 0.2s;
}
.btn-primary-download:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(37, 99, 235, 0.6);
  background: linear-gradient(135deg, #3b82f6, #2563eb);
}

.secondary-download-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr 1fr;
  gap: 8px;
}

.btn-secondary-download {
  background: #0f172a;
  border: 1px solid var(--border);
  color: #e2e8f0;
  padding: 10px 12px;
  border-radius: 8px;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  transition: all 0.2s;
}
.btn-secondary-download:hover {
  background: var(--surface-alt);
  border-color: #64748b;
}

/* ==========================================================================
   Monetization / Ad Placeholders
   ========================================================================== */
.ad-slot-container {
  margin: 30px auto;
  border: 2px dashed #475569;
  background: rgba(30, 41, 59, 0.4);
  border-radius: 10px;
  padding: 16px;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 6px;
  transition: border-color 0.2s;
}
.ad-slot-container:hover {
  border-color: #64748b;
}

.ad-tag {
  display: inline-block;
  background: #334155;
  color: #94a3b8;
  font-size: 0.7rem;
  font-weight: 800;
  letter-spacing: 1px;
  padding: 2px 8px;
  border-radius: 4px;
  text-transform: uppercase;
}

.ad-desc {
  font-size: 0.85rem;
  color: #94a3b8;
}

.ad-leaderboard {
  max-width: 728px;
  min-height: 90px;
}

.ad-content-banner {
  max-width: 800px;
  min-height: 120px;
  margin: 40px auto;
}

/* Corner Ad Badge */
.ad-corner-badge {
  position: fixed;
  bottom: 20px;
  right: 20px;
  background: #1e293b;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px 16px;
  box-shadow: 0 10px 25px rgba(0,0,0,0.5);
  z-index: 90;
  max-width: 280px;
  animation: slideUp 0.4s ease-out;
}

@keyframes slideUp {
  from { transform: translateY(50px); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}

.ad-corner-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 6px;
}

.ad-corner-close {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 1.1rem;
  cursor: pointer;
  padding: 0 4px;
}

.ad-corner-text {
  font-size: 0.8rem;
  color: #cbd5e1;
}

/* Download Modal Pop-up */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(6px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  opacity: 0;
  visibility: hidden;
  transition: all 0.25s ease-out;
  padding: 20px;
}

.modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

.modal-box {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  max-width: 540px;
  width: 100%;
  padding: 28px;
  box-shadow: var(--shadow);
  transform: scale(0.95);
  transition: transform 0.25s ease-out;
  position: relative;
}

.modal-overlay.active .modal-box {
  transform: scale(1);
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
}

.modal-title {
  font-size: 1.2rem;
  font-weight: 700;
  color: #fff;
}

.modal-close-icon {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 1.4rem;
  cursor: pointer;
}

.modal-ad-slot {
  background: #0f172a;
  border: 2px dashed #475569;
  border-radius: 10px;
  padding: 30px 20px;
  margin: 16px 0 20px;
  text-align: center;
}

.modal-countdown {
  font-size: 0.85rem;
  color: var(--text-muted);
  text-align: center;
  margin-bottom: 16px;
}

.modal-action-btn {
  width: 100%;
  background: var(--primary);
  color: #fff;
  border: none;
  padding: 12px;
  border-radius: 8px;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s;
}
.modal-action-btn:hover {
  background: var(--primary-hover);
}

/* ==========================================================================
   Content Sections (Steps, Use Cases, 3D Guide, FAQ)
   ========================================================================== */
.content-section {
  padding: 60px 0;
  border-top: 1px solid var(--border);
}

.section-header {
  text-align: center;
  margin-bottom: 40px;
}

.section-title {
  font-size: 2rem;
  font-weight: 800;
  margin-bottom: 12px;
  color: #fff;
}

.section-subtitle {
  font-size: 1.05rem;
  color: var(--text-muted);
  max-width: 680px;
  margin: 0 auto;
}

/* Steps Grid */
.steps-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

@media (max-width: 768px) {
  .viewport-container { height: 360px; }
  .steps-grid {
    grid-template-columns: 1fr;
  }
}

.step-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  position: relative;
}

.step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: var(--primary);
  color: #fff;
  font-weight: 800;
  border-radius: 50%;
  margin-bottom: 16px;
}

.step-title {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 10px;
  color: #fff;
}

.step-desc {
  font-size: 0.92rem;
  color: var(--text-muted);
  line-height: 1.5;
}

/* Use Cases Grid */
.use-cases-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 20px;
}

.use-case-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  transition: transform 0.2s, border-color 0.2s;
}
.use-case-card:hover {
  transform: translateY(-3px);
  border-color: #38bdf8;
}

.use-case-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}

.use-case-icon {
  font-size: 1.8rem;
  background: #0f172a;
  width: 48px;
  height: 48px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border);
}

.use-case-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: #fff;
}

.use-case-text {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 12px;
}

.use-case-badge {
  display: inline-block;
  background: rgba(56, 189, 248, 0.12);
  color: #38bdf8;
  font-size: 0.78rem;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: 6px;
}

/* 3D Printing Guide */
.guide-container {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
}

.guide-cols {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 30px;
  margin-bottom: 30px;
}

@media (max-width: 768px) {
  .viewport-container { height: 360px; }
  .guide-cols {
    grid-template-columns: 1fr;
  }
}

.guide-block {
  background: #0f172a;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 20px;
}

.guide-block-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: #38bdf8;
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.guide-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
  font-size: 0.9rem;
  color: #cbd5e1;
}

.guide-list li {
  display: flex;
  align-items: flex-start;
  gap: 8px;
}

.guide-list li strong {
  color: #fff;
}

.slicer-params-bar {
  background: rgba(30, 41, 59, 0.8);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 16px 20px;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-around;
  gap: 16px;
}

.param-item {
  text-align: center;
}
.param-name {
  font-size: 0.78rem;
  color: var(--text-muted);
}
.param-val {
  font-size: 0.95rem;
  font-weight: 700;
  color: #fff;
}

/* FAQ Accordion */
.faq-list {
  max-width: 850px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.faq-item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
  transition: border-color 0.2s;
}
.faq-item.active {
  border-color: #64748b;
}

.faq-question {
  padding: 18px 22px;
  font-size: 1.02rem;
  font-weight: 600;
  color: #fff;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  user-select: none;
}

.faq-icon {
  font-size: 1.2rem;
  transition: transform 0.2s;
}
.faq-item.active .faq-icon {
  transform: rotate(45deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease-out, padding 0.3s ease-out;
  padding: 0 22px;
  color: var(--text-muted);
  font-size: 0.93rem;
  line-height: 1.6;
}
.faq-item.active .faq-answer {
  max-height: 250px;
  padding: 0 22px 20px;
}

/* ==========================================================================
   Footer
   ========================================================================== */
footer {
  border-top: 1px solid var(--border);
  padding: 40px 0;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.88rem;
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: 20px;
  margin-bottom: 16px;
}

/* ==========================================================================
   3D Viewport Trackpad & Touch Floating Toolbar Controls
   ========================================================================== */
.viewport-floating-controls {
  position: absolute;
  top: 48px;
  right: 12px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  z-index: 10;
  pointer-events: auto;
}

.viewport-ctrl-btn {
  background: rgba(15, 23, 42, 0.88);
  border: 1px solid var(--border);
  color: #f8fafc;
  width: 34px;
  height: 34px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.95rem;
  cursor: pointer;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.4);
  transition: all 0.15s;
  user-select: none;
}

.viewport-ctrl-btn:hover {
  background: #334155;
  border-color: #38bdf8;
  color: #38bdf8;
  transform: scale(1.08);
}

.viewport-ctrl-btn:active {
  transform: scale(0.95);
  background: #1e293b;
}

.viewport-ctrl-btn.active {
  background: var(--primary);
  border-color: #60a5fa;
  color: #fff;
}

.trackpad-hint-bar {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.76rem;
  color: #94a3b8;
  background: rgba(15, 23, 42, 0.85);
  border: 1px solid var(--border);
  padding: 4px 10px;
  border-radius: 20px;
}

/* ==========================================================================
   Interactive Zoom Slider Control Bar
   ========================================================================== */
.zoom-slider-bar {
  display: flex;
  align-items: center;
  gap: 10px;
  background: #0f172a;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px 14px;
  margin-top: 10px;
}

.zoom-label {
  font-size: 0.82rem;
  font-weight: 700;
  color: #cbd5e1;
  white-space: nowrap;
}

.zoom-step-btn {
  background: var(--surface-alt);
  border: 1px solid var(--border);
  color: #fff;
  width: 28px;
  height: 28px;
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.85rem;
  cursor: pointer;
  transition: all 0.15s;
}
.zoom-step-btn:hover {
  background: #475569;
  border-color: #38bdf8;
}

#zoomSlider {
  flex: 1;
  accent-color: var(--primary);
  cursor: pointer;
  height: 6px;
  background: #334155;
  border-radius: 4px;
  outline: none;
}

/* ==========================================================================
   Dedicated 2D QR Code Section & Card
   ========================================================================== */
.qr-2d-section {
  margin-top: 30px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow);
}

.qr-2d-grid {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 30px;
  align-items: center;
}

@media (max-width: 768px) {
  .qr-2d-grid {
    grid-template-columns: 1fr;
    text-align: center;
  }
}

.qr-2d-preview-wrapper {
  background: #0f172a;
  border: 2px solid var(--border);
  border-radius: 12px;
  padding: 16px;
  display: flex;
  justify-content: center;
  align-items: center;
  box-shadow: inset 0 2px 8px rgba(0, 0, 0, 0.4);
}

#qrCanvas2dFull {
  width: 100%;
  max-width: 240px;
  height: auto;
  aspect-ratio: 1/1;
  border-radius: 8px;
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.35);
  display: block;
}

.qr-2d-info-col {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.qr-2d-title {
  font-size: 1.3rem;
  font-weight: 700;
  color: #fff;
  display: flex;
  align-items: center;
  gap: 8px;
}

.qr-2d-desc {
  font-size: 0.92rem;
  color: var(--text-muted);
  line-height: 1.5;
}

.qr-2d-meta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.qr-meta-pill {
  background: #0f172a;
  border: 1px solid var(--border);
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 0.78rem;
  color: #cbd5e1;
}

.qr-2d-actions-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 6px;
}

.btn-2d-download {
  background: #0f172a;
  border: 1px solid #38bdf8;
  color: #38bdf8;
  padding: 10px 18px;
  border-radius: 8px;
  font-size: 0.9rem;
  font-weight: 700;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: all 0.2s;
}
.btn-2d-download:hover {
  background: #0284c7;
  border-color: #0284c7;
  color: #fff;
  transform: translateY(-2px);
}