/* ===== Layout ===== */
.qr-layout {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 28px;
  align-items: stretch;
}

.qr-main { min-width: 0; }

.qr-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: 0 2px 4px 0 rgb(15 23 42 / 0.08), 0 10px 25px -5px rgb(15 23 42 / 0.08), 0 1px 3px 0 rgb(79 70 229 / 0.05);
}

.qr-sidebar {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.sidebar-section {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: 14px;
  padding: 20px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
}

.sidebar-header {
  text-align: center;
  padding: 24px 16px !important;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%) !important;
  border-color: transparent !important;
}

.sidebar-header h1 { font-size: 1.35rem; font-weight: 800; color: #fff; margin-bottom: 6px; text-shadow: 0 2px 8px rgba(0,0,0,0.2); }
.sidebar-header p { font-size: 0.82rem; color: rgba(255,255,255,0.85); }

body[data-theme="dark"] .sidebar-header { background: linear-gradient(135deg, #667eea 0%, #764ba2 100%) !important; }

.sidebar-title { font-size: 1rem; font-weight: 700; color: var(--text); margin-bottom: 16px; display: flex; align-items: center; gap: 8px; }
.sidebar-title i { color: var(--primary); font-size: 0.9rem; }

.sidebar-tools { display: flex; flex-direction: column; gap: 8px; }

.sidebar-tool {
  display: flex; align-items: center; gap: 12px; padding: 10px 12px;
  border-radius: 10px; transition: all 0.2s ease; text-decoration: none; background: var(--bg-soft);
}
.sidebar-tool:hover { background: var(--primary-50); transform: translateX(3px); }

.sidebar-tool-icon {
  width: 36px; height: 36px; display: flex; align-items: center; justify-content: center;
  border-radius: 10px; font-size: 16px; flex-shrink: 0;
  background: linear-gradient(135deg, #6366f1, #8b5cf6); color: #fff;
}

.sidebar-tool-info { flex: 1; min-width: 0; }
.sidebar-tool-name { font-size: 0.9rem; font-weight: 700; color: var(--text); margin-bottom: 2px; }
.sidebar-tool-desc { font-size: 0.78rem; color: var(--text-muted); }

body[data-theme="dark"] .sidebar-section { background: var(--bg-card); border-color: var(--border); }
body[data-theme="dark"] .sidebar-tool { background: var(--bg-muted); }
body[data-theme="dark"] .sidebar-tool:hover { background: var(--primary-50); }

/* ===== Ad Placeholder ===== */
.ad-placeholder {
  width: 300px; height: 250px; flex-shrink: 0; margin: 0 auto;
  background: var(--bg-card);
  border: 2px dashed var(--border);
  border-radius: 14px;
  display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  text-align: center;
  padding: 20px;
  color: var(--text-muted);
  font-size: 0.82rem; line-height: 1.5;
}
.ad-placeholder .ad-icon { font-size: 1.8rem; color: var(--text-muted); margin-bottom: 10px; opacity: 0.4; }
.ad-placeholder .ad-label { font-weight: 600; font-size: 0.85rem; color: var(--text-muted); margin-bottom: 4px; }
.ad-placeholder .ad-size { font-size: 0.75rem; color: var(--text-muted); opacity: 0.6; }
body[data-theme="dark"] .ad-placeholder { background: var(--bg-card); border-color: var(--border); }

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .qr-layout { grid-template-columns: 1fr 280px; gap: 20px; }
}

@media (max-width: 860px) {
  .qr-layout { grid-template-columns: 1fr; }
  .qr-sidebar { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
}

@media (max-width: 640px) {
  .qr-sidebar { grid-template-columns: 1fr; }
}

/* ===== Original Styles ===== */
.qr-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  max-width: 1000px;
  margin: 0 auto;
}

.qr-controls {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.ctrl-row {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.ctrl-row-half {
  flex-direction: row;
  gap: 14px;
}

.ctrl-row-half > div {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.ctrl-row label {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-secondary);
}

.ctrl-row textarea,
.ctrl-row select,
.ctrl-row input[type="text"] {
  padding: 12px 14px;
  border: 1px solid var(--border-light);
  border-radius: 10px;
  font-size: 14px;
  font-family: inherit;
  color: var(--text);
  background: var(--bg);
  resize: vertical;
  outline: none;
  transition: border-color 0.15s;
}

.ctrl-row textarea:focus,
.ctrl-row select:focus {
  border-color: var(--primary);
}

.ctrl-row input[type="color"] {
  width: 100%;
  height: 44px;
  border: 1px solid var(--border-light);
  border-radius: 10px;
  cursor: pointer;
  padding: 4px;
  background: #fff;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 16px;
  background: var(--bg-card);
  color: var(--text);
  border: 1px solid var(--border-light);
  border-radius: 8px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  font-family: inherit;
  transition: all 0.15s;
}

.btn:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary), #8b5cf6);
  color: #fff;
  border: none;
}

.btn-primary:hover {
  transform: translateY(-1px);
  color: #fff;
  box-shadow: 0 4px 12px rgba(79, 70, 229, 0.3);
}

.btn-generate {
  margin-top: 4px;
  padding: 14px;
  font-size: 15px;
  width: 100%;
  justify-content: center;
}

.qr-preview {
  text-align: center;
  min-height: 400px;
}

.qr-canvas-wrap {
  background: var(--bg-soft);
  border-radius: 16px;
  padding: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 320px;
}

#qr-canvas {
  max-width: 100%;
  height: auto;
  border-radius: 8px;
  background: #fff;
  image-rendering: pixelated;
  image-rendering: -moz-crisp-edges;
  image-rendering: crisp-edges;
}

.qr-info {
  margin-top: 14px;
  font-size: 13px;
  color: var(--text-muted);
}

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

body[data-theme="dark"] .ctrl-row textarea,
body[data-theme="dark"] .ctrl-row select,
body[data-theme="dark"] .ctrl-row input[type="text"] {
  background: #1e293b;
  color: #f1f5f9;
  border-color: #334155;
}
body[data-theme="dark"] .ctrl-row textarea:focus,
body[data-theme="dark"] .ctrl-row select:focus {
  border-color: var(--primary);
}
body[data-theme="dark"] .ctrl-row input[type="color"] {
  background: #1e293b;
  border-color: #334155;
}
body[data-theme="dark"] .qr-canvas-wrap {
  background: #1e293b;
  border-color: #334155;
}
body[data-theme="dark"] .btn {
  background: #1e293b;
  border-color: #334155;
  color: #f1f5f9;
}
body[data-theme="dark"] .btn:hover {
  border-color: var(--primary);
  color: var(--primary-light);
}

/* ===== calc-bottom Styles ===== */
.calc-bottom {
  padding: 12px 0 56px;
}

.calc-bottom-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 18px;
  margin-bottom: 18px;
}

.calc-panel {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: 16px;
  box-shadow: 0 8px 30px rgba(15, 23, 42, 0.06);
  padding: 20px;
}

.calc-panel-title {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 12px;
  font-size: 18px;
  font-weight: 800;
  color: var(--text);
}

.calc-panel-title i {
  color: var(--primary);
}

.calc-panel-lead {
  margin: 0 0 16px;
  color: var(--text-muted);
  line-height: 1.7;
}

.calc-feature-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
  margin-bottom: 16px;
}

.calc-feature-card {
  border-radius: 14px;
  padding: 14px;
  background: linear-gradient(180deg, rgba(99, 102, 241, 0.08), rgba(99, 102, 241, 0.03));
  border: 1px solid rgba(99, 102, 241, 0.12);
}

.calc-feature-card.accent-green {
  background: linear-gradient(180deg, rgba(16, 185, 129, 0.12), rgba(16, 185, 129, 0.03));
  border-color: rgba(16, 185, 129, 0.14);
}

.calc-feature-card.accent-blue {
  background: linear-gradient(180deg, rgba(59, 130, 246, 0.12), rgba(59, 130, 246, 0.03));
  border-color: rgba(59, 130, 246, 0.14);
}

.calc-feature-card.accent-orange {
  background: linear-gradient(180deg, rgba(245, 158, 11, 0.12), rgba(245, 158, 11, 0.03));
  border-color: rgba(245, 158, 11, 0.14);
}

.calc-feature-card.accent-violet {
  background: linear-gradient(180deg, rgba(168, 85, 247, 0.12), rgba(168, 85, 247, 0.03));
  border-color: rgba(168, 85, 247, 0.14);
}

.calc-feature-icon {
  width: 34px;
  height: 34px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 10px;
  color: #fff;
  background: linear-gradient(135deg, var(--primary), #8b5cf6);
}

.accent-green .calc-feature-icon {
  background: linear-gradient(135deg, #10b981, #059669);
}

.accent-blue .calc-feature-icon {
  background: linear-gradient(135deg, #3b82f6, #2563eb);
}

.accent-orange .calc-feature-icon {
  background: linear-gradient(135deg, #f59e0b, #d97706);
}

.accent-violet .calc-feature-icon {
  background: linear-gradient(135deg, #a855f7, #7c3aed);
}

.calc-feature-name {
  font-size: 14px;
  font-weight: 800;
  color: var(--text);
  margin-bottom: 4px;
}

.calc-feature-desc {
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--text-muted);
}

.calc-feature-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px 18px;
  color: var(--text-muted);
  font-size: 13px;
  line-height: 1.7;
}

.calc-feature-list i {
  color: #10b981;
  margin-right: 6px;
}

.shortcut-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}

.shortcut-table thead th {
  text-align: left;
  padding: 10px 0;
  color: var(--text-muted);
  font-weight: 700;
  border-bottom: 1px solid var(--border-light);
}

.shortcut-table tbody td {
  padding: 10px 0;
  border-bottom: 1px solid var(--border-light);
  color: var(--text);
}

.shortcut-table tbody td:first-child {
  font-family: 'SF Mono', Monaco, Consolas, monospace;
  color: var(--primary);
  font-weight: 700;
}

.calc-steps {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
}

.calc-step {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 14px;
  border-radius: 14px;
  background: linear-gradient(180deg, rgba(99, 102, 241, 0.08), rgba(99, 102, 241, 0.03));
}

.calc-step-num {
  width: 28px;
  height: 28px;
  border-radius: 999px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--primary), #8b5cf6);
  color: #fff;
  font-weight: 800;
  font-size: 13px;
}

.calc-step-title {
  font-weight: 800;
  color: var(--text);
  margin-bottom: 4px;
}

.calc-step-desc {
  color: var(--text-muted);
  font-size: 13px;
  line-height: 1.6;
}

.calc-use-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
}

.calc-use-card {
  border-radius: 14px;
  padding: 16px;
  border: 1px solid var(--border-light);
  background: linear-gradient(180deg, rgba(99, 102, 241, 0.06), rgba(255, 255, 255, 0.04));
}

.calc-use-card.warm { background: linear-gradient(180deg, rgba(245, 158, 11, 0.12), rgba(245, 158, 11, 0.03)); }
.calc-use-card.cool { background: linear-gradient(180deg, rgba(168, 85, 247, 0.12), rgba(168, 85, 247, 0.03)); }
.calc-use-card.green { background: linear-gradient(180deg, rgba(16, 185, 129, 0.12), rgba(16, 185, 129, 0.03)); }
.calc-use-card.amber { background: linear-gradient(180deg, rgba(59, 130, 246, 0.12), rgba(59, 130, 246, 0.03)); }

.calc-use-icon {
  width: 34px;
  height: 34px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  margin-bottom: 10px;
  background: linear-gradient(135deg, var(--primary), #8b5cf6);
}

.warm .calc-use-icon { background: linear-gradient(135deg, #f59e0b, #d97706); }
.cool .calc-use-icon { background: linear-gradient(135deg, #a855f7, #7c3aed); }
.green .calc-use-icon { background: linear-gradient(135deg, #10b981, #059669); }
.amber .calc-use-icon { background: linear-gradient(135deg, #3b82f6, #2563eb); }

.calc-use-title {
  font-size: 14px;
  font-weight: 800;
  color: var(--text);
  margin-bottom: 4px;
}

.calc-use-desc {
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--text-muted);
}

.calc-knowledge-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.calc-knowledge-card {
  border-radius: 14px;
  padding: 16px;
  background: linear-gradient(180deg, rgba(99, 102, 241, 0.08), rgba(255, 255, 255, 0.04));
  border: 1px solid rgba(99, 102, 241, 0.08);
}

.calc-knowledge-title {
  font-weight: 800;
  color: var(--text);
  margin-bottom: 8px;
}

.calc-knowledge-card p {
  margin: 0;
  color: var(--text-muted);
  line-height: 1.7;
  font-size: 13px;
}

.calc-cta {
  margin-top: 14px;
  border-radius: 16px;
  padding: 18px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.10), rgba(168, 85, 247, 0.10));
  border: 1px solid rgba(99, 102, 241, 0.16);
}

.calc-cta-title {
  font-size: 15px;
  font-weight: 800;
  color: var(--text);
  margin-bottom: 4px;
}

.calc-cta-title i {
  color: #8b5cf6;
  margin-right: 8px;
}

.calc-cta-text {
  color: var(--text-muted);
  line-height: 1.6;
  font-size: 13px;
}

body[data-theme="dark"] .calc-cta,
body[data-theme="dark"] .calc-feature-card,
body[data-theme="dark"] .calc-use-card,
body[data-theme="dark"] .calc-knowledge-card {
  border-color: var(--border);
}

/* ===== calc-bottom Responsive ===== */
@media (max-width: 860px) {
  .calc-bottom-grid {
    grid-template-columns: 1fr;
  }
  .calc-feature-grid, .calc-steps, .calc-use-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .calc-knowledge-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 640px) {
  .calc-feature-grid, .calc-steps, .calc-use-grid, .calc-knowledge-grid {
    grid-template-columns: 1fr;
  }
}
body[data-theme="dark"] .btn-primary {
  background: linear-gradient(135deg, var(--primary), #8b5cf6);
  color: #fff;
}
body[data-theme="dark"] .btn-primary:hover {
  box-shadow: 0 4px 12px rgba(79, 70, 229, 0.4);
  color: #fff;
}