:root {
  --navy: #0f2744;
  --navy-soft: #1e3a5f;
  --orange: #ea580c;
  --orange-hover: #c2410c;
  --bg: #f4f6f9;
  --surface: #ffffff;
  --border: #e2e8f0;
  --muted: #64748b;
  --success: #059669;
  --warn: #d97706;
  --radius: 12px;
  --shadow: 0 4px 24px rgba(15, 39, 68, 0.08);
  --font: 'Open Sans', system-ui, sans-serif;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font);
  color: var(--navy);
  background: var(--bg);
  line-height: 1.5;
  min-height: 100vh;
}

body.modal-open {
  overflow: hidden;
}

.site-header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 40;
}

.header-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0.85rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand {
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: 0.04em;
  color: var(--navy);
}

.brand span {
  color: var(--orange);
  font-weight: 600;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.disclaimer-bar {
  background: #fff7ed;
  border-bottom: 1px solid #fed7aa;
  color: #9a3412;
  font-size: 0.85rem;
  text-align: center;
  padding: 0.45rem 1rem;
}

main {
  max-width: 1280px;
  margin: 0 auto;
  padding: 1.25rem;
}

.configurator-main {
  max-width: 1100px;
  margin: 0 auto;
}

.config-stepper {
  margin-bottom: 1.25rem;
}

.stepper-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
}

.stepper-item {
  display: flex;
  align-items: flex-start;
  gap: 0.65rem;
  padding: 0.85rem 1rem;
  border: 2px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--muted);
  transition: border-color 0.15s, color 0.15s, background 0.15s;
}

.stepper-item.active {
  border-color: var(--orange);
  color: var(--navy);
  background: #fff7ed;
}

.stepper-item.done {
  border-color: #86efac;
  color: var(--navy);
}

.stepper-num {
  flex-shrink: 0;
  width: 1.75rem;
  height: 1.75rem;
  border-radius: 50%;
  background: var(--border);
  color: var(--navy);
  font-weight: 700;
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  justify-content: center;
}

.stepper-item.active .stepper-num {
  background: var(--orange);
  color: #fff;
}

.stepper-item.done .stepper-num {
  background: #22c55e;
  color: #fff;
}

.stepper-text {
  font-size: 0.88rem;
  font-weight: 600;
  line-height: 1.35;
}

.step-heading {
  margin-bottom: 1.25rem;
}

.step-heading-compact {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
}

.step-title {
  margin: 0;
  font-size: 1.15rem;
  color: var(--navy);
  font-weight: 700;
}

.step-lead {
  margin: 0.5rem 0 0;
  color: var(--muted);
  font-size: 0.92rem;
  max-width: 52rem;
}

.step-panel-1 {
  display: grid;
  grid-template-columns: 1fr min(340px, 38%);
  gap: 1.25rem;
  align-items: start;
}

.step1-form {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.25rem 1.35rem 1.5rem;
}

.step1-block {
  border: none;
  margin: 0 0 1.25rem;
  padding: 0 0 1.15rem;
  border-bottom: 1px solid var(--border);
}

.step1-block:last-of-type {
  border-bottom: none;
  padding-bottom: 0;
  margin-bottom: 0.75rem;
}

.step1-block legend {
  font-weight: 700;
  color: var(--navy);
  font-size: 0.95rem;
  margin-bottom: 0.35rem;
  padding: 0;
}

.step1-num {
  color: var(--orange);
  margin-right: 0.25rem;
}

.mount-pair-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-top: 0.5rem;
}

.mount-col-title {
  margin: 0 0 0.5rem;
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--muted);
}

.connection-pick-grid {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.connection-pick {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  padding: 0.45rem 0.55rem;
  border: 2px solid var(--border);
  border-radius: 8px;
  background: #fafbfc;
  cursor: pointer;
  text-align: left;
  font: inherit;
  color: var(--navy);
  transition: border-color 0.12s, background 0.12s;
}

.connection-pick:hover {
  border-color: #93c5fd;
}

.connection-pick.selected {
  border-color: var(--orange);
  background: #fff7ed;
}

.connection-pick-label {
  font-size: 0.82rem;
  font-weight: 600;
  line-height: 1.25;
}

.step1-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem;
  margin-top: 0.35rem;
}

.step1-label {
  font-weight: 600;
  font-size: 0.9rem;
}

.input-with-unit {
  display: flex;
  align-items: stretch;
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
  background: #fff;
}

.input-with-unit input {
  border: none;
  padding: 0.55rem 0.65rem;
  font: inherit;
  width: 7rem;
  min-width: 0;
}

.input-with-unit input:focus {
  outline: 2px solid #93c5fd;
  outline-offset: -2px;
}

.unit-tag {
  padding: 0 0.65rem;
  background: #f1f5f9;
  color: var(--muted);
  font-size: 0.85rem;
  font-weight: 700;
  display: flex;
  align-items: center;
}

.chip-group {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.35rem;
}

.chip {
  border: 2px solid var(--border);
  background: #fafbfc;
  border-radius: 999px;
  padding: 0.45rem 1rem;
  font: inherit;
  font-weight: 600;
  font-size: 0.88rem;
  cursor: pointer;
  color: var(--navy);
}

.chip.selected {
  border-color: var(--orange);
  background: #fff7ed;
}

.unit-toggle {
  display: inline-flex;
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
}

.unit-toggle-btn {
  border: none;
  background: #f1f5f9;
  padding: 0.45rem 0.85rem;
  font: inherit;
  font-weight: 600;
  cursor: pointer;
  color: var(--muted);
}

.unit-toggle-btn.active {
  background: var(--orange);
  color: #fff;
}

.step1-length-row {
  align-items: center;
}

.step1-actions {
  margin-top: 0.5rem;
}

.btn-lg {
  width: 100%;
  padding: 0.85rem 1.25rem;
  font-size: 1rem;
}

.step1-no-match {
  margin: 0.75rem 0 0;
  padding: 0.65rem 0.85rem;
  background: #fef2f2;
  border: 1px solid #fecaca;
  border-radius: 8px;
  color: #b91c1c;
  font-size: 0.88rem;
}

.step1-preview-wrap {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.75rem;
  position: sticky;
  top: 1rem;
}

.step1-preview-label {
  margin: 0 0 0.5rem;
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--muted);
}

.step1-preview-visual {
  background: linear-gradient(180deg, #fafbfc 0%, #eef2f7 100%);
  border-radius: 8px;
  min-height: 180px;
}

.refine-sub {
  margin: -0.35rem 0 1rem;
  font-size: 0.88rem;
  color: var(--muted);
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

.visual-panel-full {
  width: 100%;
}

.refine-section {
  margin-top: 1.5rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.25rem;
}

.refine-title {
  margin: 0 0 1rem;
  font-size: 1.05rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--navy);
}

.refine-icon {
  color: var(--orange);
}

.refine-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}

.refine-card {
  position: relative;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0.85rem 0.85rem 2.5rem;
  background: #fafbfc;
  cursor: pointer;
  transition: border-color 0.15s, box-shadow 0.15s;
  min-height: 100%;
}

.refine-card:hover {
  border-color: #93c5fd;
  box-shadow: var(--shadow);
}

.refine-card-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.35rem;
}

.stock-badge {
  font-size: 0.72rem;
  font-weight: 700;
  padding: 0.15rem 0.45rem;
  border-radius: 4px;
}

.stock-ok {
  background: #dcfce7;
  color: #166534;
}

.stock-low {
  background: #ffedd5;
  color: #c2410c;
}

.stock-out {
  background: #fee2e2;
  color: #b91c1c;
}

.refine-2d-badge {
  font-size: 0.65rem;
  font-weight: 700;
  color: var(--muted);
  border: 1px solid var(--border);
  padding: 0.1rem 0.35rem;
  border-radius: 3px;
}

.refine-card-title {
  margin: 0 0 0.5rem;
  font-size: 0.82rem;
  color: var(--muted);
  font-weight: 600;
}

.refine-thumb {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 88px;
  margin-bottom: 0.65rem;
  background: linear-gradient(180deg, #fff 0%, #f1f5f9 100%);
  border-radius: 8px;
  border: 1px solid #e2e8f0;
  padding: 0.35rem;
}

.refine-part-name {
  margin: -0.25rem 0 0.5rem;
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--navy);
}

.part-product-svg {
  display: block;
  max-width: 100%;
}

.refine-specs {
  font-size: 0.78rem;
  border-top: 1px solid var(--border);
  padding-top: 0.5rem;
}

.refine-spec-row {
  display: flex;
  justify-content: space-between;
  gap: 0.5rem;
  margin-bottom: 0.25rem;
  color: var(--navy);
}

.refine-spec-row span {
  color: var(--muted);
}

.refine-price {
  margin: 0.65rem 0 0;
  font-weight: 700;
  font-size: 0.95rem;
}

.refine-change-btn {
  position: absolute;
  bottom: 0.5rem;
  left: 50%;
  transform: translateX(-50%);
  border: none;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 6px;
  width: 2rem;
  height: 1.6rem;
  cursor: pointer;
  color: var(--navy);
  font-size: 0.85rem;
}

.refine-change-btn:hover {
  border-color: var(--orange);
  color: var(--orange);
}

.assembly-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 1.25rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
}

.assembly-label {
  margin: 0;
  font-size: 0.78rem;
  color: var(--muted);
}

.assembly-total {
  margin: 0.15rem 0 0;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--navy);
}

.part-picker-list {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  max-height: 60vh;
  overflow: auto;
}

.part-picker-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  width: 100%;
  text-align: left;
  padding: 0.65rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #fff;
  cursor: pointer;
  font: inherit;
  color: var(--navy);
}

.part-picker-item:hover {
  border-color: #93c5fd;
}

.part-picker-item.selected {
  border-color: var(--orange);
  background: #fff7ed;
}

.part-picker-info {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  font-size: 0.82rem;
}

.part-picker-info span {
  color: var(--muted);
}

.part-picker-thumb {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 72px;
}

.visual-panel {
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1rem 1rem 0.5rem;
  border: 1px solid var(--border);
}

.product-title-bar {
  font-size: 0.82rem;
  color: var(--navy-soft);
  margin: 0 0 0.65rem;
  line-height: 1.45;
  font-weight: 600;
}

.visual-toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 0.75rem;
  align-items: center;
  justify-content: space-between;
}

.toolbar-left {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.view-mode-group {
  display: flex;
  gap: 0.35rem;
  background: #f1f5f9;
  padding: 0.25rem;
  border-radius: 8px;
  border: 1px solid var(--border);
}

.view-mode-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.1rem;
  padding: 0.35rem 0.55rem;
  border: 1px solid transparent;
  border-radius: 6px;
  background: transparent;
  cursor: pointer;
  font: inherit;
  font-size: 0.65rem;
  font-weight: 700;
  color: var(--muted);
  min-width: 3rem;
}

.view-mode-btn:hover {
  background: #fff;
  color: var(--navy);
}

.view-mode-btn.active {
  background: #fff;
  border-color: #fdba74;
  color: var(--navy);
  box-shadow: 0 1px 4px rgba(234, 88, 12, 0.15);
}

#spring-visual.rod-dragging {
  cursor: grabbing;
}

#spring-visual.rod-dragging .rod-drag-hit {
  cursor: grabbing;
}

.visual-toolbar .hint {
  font-size: 0.8rem;
  color: var(--muted);
  margin: 0;
}

.visual-force-bar {
  font-size: 0.88rem;
  color: var(--navy);
  margin-bottom: 0.5rem;
  padding: 0.35rem 0.5rem;
  background: #f8fafc;
  border-radius: 6px;
  border: 1px solid var(--border);
  line-height: 1.45;
}

.visual-force-bar:empty {
  display: none;
}

.visual-force-bar strong {
  color: #1d4ed8;
}

.visual-force-bar .muted {
  color: var(--muted);
  font-weight: 400;
}

.visual-deviations {
  margin-top: 0.65rem;
  padding: 0.65rem 0.85rem;
  background: #e0f2fe;
  border: 1px solid #7dd3fc;
  border-radius: 8px;
  font-size: 0.82rem;
  color: #0c4a6e;
  line-height: 1.5;
}

.visual-deviations p {
  margin: 0.35rem 0;
}

.visual-deviations p:first-child {
  margin-top: 0;
}

.visual-deviations p:last-child {
  margin-bottom: 0;
}

#spring-visual {
  min-height: 360px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(180deg, #fafbfc 0%, #eef2f7 100%);
  border-radius: 8px;
  overflow: hidden;
}

.spring-svg {
  width: 100%;
  height: auto;
  max-height: 360px;
}

.spring-side-cad .cad-underlay image {
  filter: contrast(1.08) saturate(0.85);
}

.spring-side-cad .cad-underlay {
  mix-blend-mode: multiply;
}

.spring-svg .tech-dim line,
.spring-svg .tech-dim text {
  pointer-events: none;
}

.spring-svg .tech-dim-label-body {
  fill: #1d4ed8;
  font-size: 12px;
  font-weight: 600;
}

#selection-summary {
  font-size: 0.9rem;
  color: var(--muted);
  padding: 0.75rem 0 0.25rem;
  border-top: 1px solid var(--border);
  margin-top: 0.5rem;
}

.control-panel {
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
  padding: 1.25rem;
}

.control-panel h2 {
  margin: 0 0 1rem;
  font-size: 1.15rem;
}

.field {
  margin-bottom: 1rem;
}

.field label,
.field .field-label {
  display: block;
  font-weight: 600;
  font-size: 0.9rem;
  margin-bottom: 0.35rem;
}

.field-hint {
  font-size: 0.78rem;
  color: var(--muted);
  margin: 0.2rem 0 0.5rem;
}

.field input,
.field select {
  width: 100%;
  padding: 0.55rem 0.65rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  font: inherit;
  color: var(--navy);
  background: #fff;
}

.field input:focus,
.field select:focus {
  outline: 2px solid rgba(234, 88, 12, 0.35);
  border-color: var(--orange);
}

.field.has-error input,
.field.has-error select {
  border-color: #dc2626;
}

.field-error {
  color: #dc2626;
  font-size: 0.78rem;
  min-height: 1.1em;
  margin-top: 0.25rem;
}

.conn-picker-btn {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.65rem 0.75rem;
  border: 1px dashed var(--navy-soft);
  border-radius: 8px;
  background: #f8fafc;
  cursor: pointer;
  text-align: left;
  font: inherit;
  color: var(--navy);
  transition: border-color 0.15s, background 0.15s;
}

.conn-picker-btn:hover {
  border-color: var(--orange);
  background: #fff7ed;
}

.conn-mini-icon {
  flex-shrink: 0;
  display: flex;
}

.conn-picker-text {
  flex: 1;
  font-weight: 600;
  font-size: 0.88rem;
}

.presets {
  margin: 1rem 0;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
}

.presets p {
  font-size: 0.85rem;
  color: var(--muted);
  margin: 0 0 0.5rem;
}

.preset-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  padding: 0.55rem 1rem;
  border-radius: 8px;
  font: inherit;
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  border: none;
  transition: background 0.15s, transform 0.1s;
}

.btn:active {
  transform: scale(0.98);
}

.btn-primary {
  background: var(--orange);
  color: #fff;
}

.btn-primary:hover {
  background: var(--orange-hover);
}

.btn-secondary {
  background: #fff;
  color: var(--navy);
  border: 1px solid var(--border);
}

.btn-secondary:hover {
  border-color: var(--navy-soft);
}

.btn-ghost {
  background: transparent;
  color: var(--navy);
  border: 1px solid var(--border);
}

.btn-block {
  width: 100%;
  margin-top: 0.5rem;
}

.btn.active {
  box-shadow: inset 0 0 0 2px var(--navy);
}

.icon-btn {
  background: none;
  border: none;
  font-size: 1.5rem;
  line-height: 1;
  cursor: pointer;
  color: var(--muted);
  padding: 0.25rem;
}

.icon-btn:hover {
  color: var(--navy);
}

.cart-btn {
  position: relative;
}

.cart-badge {
  position: absolute;
  top: -6px;
  right: -6px;
  background: var(--orange);
  color: #fff;
  font-size: 0.7rem;
  min-width: 1.25rem;
  height: 1.25rem;
  border-radius: 999px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
}

.cart-badge[hidden] {
  display: none;
}

.steps {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1.25rem;
}

.step-tab {
  flex: 1;
  padding: 0.65rem;
  border: 1px solid var(--border);
  background: var(--surface);
  border-radius: 8px;
  font: inherit;
  font-weight: 600;
  cursor: pointer;
  color: var(--muted);
}

.step-tab.active {
  border-color: var(--orange);
  color: var(--navy);
  background: #fff7ed;
}

#dirty-banner {
  background: #fef3c7;
  border: 1px solid #fcd34d;
  color: #92400e;
  padding: 0.65rem 1rem;
  border-radius: 8px;
  margin-bottom: 1rem;
  font-size: 0.88rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem;
  justify-content: space-between;
}

#dirty-banner[hidden] {
  display: none !important;
}

#results-section {
  margin-top: 1.5rem;
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
  padding: 1.25rem;
}

#results-section h2 {
  margin-top: 0;
}

#results-empty {
  text-align: center;
  padding: 2rem 1rem;
  color: var(--muted);
}

#results-empty[hidden] {
  display: none;
}

#results-list {
  display: grid;
  gap: 1rem;
}

.result-card {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1rem;
  background: #fafbfc;
}

.result-card.selected {
  border-color: var(--orange);
  box-shadow: 0 0 0 1px var(--orange);
}

.result-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
}

.result-head h3 {
  margin: 0;
  font-size: 1rem;
}

.badge {
  font-size: 0.72rem;
  padding: 0.2rem 0.5rem;
  border-radius: 999px;
  font-weight: 600;
}

.badge-ok {
  background: #d1fae5;
  color: var(--success);
}

.badge-warn {
  background: #ffedd5;
  color: var(--warn);
}

.near-note {
  font-size: 0.82rem;
  color: var(--warn);
  margin: 0.5rem 0;
}

.result-specs {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.5rem 1rem;
  margin: 0.75rem 0;
  font-size: 0.85rem;
}

.result-specs dt {
  color: var(--muted);
  font-weight: 400;
}

.result-specs dd {
  margin: 0;
  font-weight: 600;
}

.result-foot {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
}

.result-foot .price {
  font-weight: 700;
  font-size: 1.1rem;
  margin-right: auto;
}

#near-results {
  margin-top: 1.5rem;
  padding-top: 1rem;
  border-top: 1px dashed var(--border);
}

#near-results[hidden] {
  display: none;
}

.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(15, 39, 68, 0.45);
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}

.modal-overlay[hidden] {
  display: none !important;
}

.modal {
  background: var(--surface);
  border-radius: var(--radius);
  max-width: 560px;
  width: 100%;
  max-height: 90vh;
  overflow: auto;
  box-shadow: var(--shadow);
}

.modal-wide {
  max-width: 720px;
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--border);
}

.modal-header h2 {
  margin: 0;
  font-size: 1.1rem;
}

.modal-body {
  padding: 1rem 1.25rem 1.25rem;
}

.conn-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 0.75rem;
}

.conn-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 0.85rem 0.5rem;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: #fff;
  cursor: pointer;
  font: inherit;
  color: var(--navy);
  transition: border-color 0.15s, box-shadow 0.15s;
}

.conn-card:hover {
  border-color: var(--orange);
  box-shadow: var(--shadow);
}

.conn-card-name {
  font-weight: 600;
  font-size: 0.82rem;
  margin-top: 0.35rem;
}

.conn-card-hint {
  font-size: 0.7rem;
  color: var(--muted);
  margin-top: 0.25rem;
  line-height: 1.3;
}

.cart-overlay {
  position: fixed;
  inset: 0;
  background: rgba(15, 39, 68, 0.35);
  z-index: 90;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s;
}

.cart-overlay.show {
  opacity: 1;
  pointer-events: auto;
}

.cart-panel {
  position: fixed;
  top: 0;
  right: 0;
  width: min(100%, 380px);
  height: 100%;
  background: var(--surface);
  z-index: 95;
  box-shadow: -4px 0 24px rgba(0, 0, 0, 0.12);
  transform: translateX(100%);
  transition: transform 0.25s ease;
  display: flex;
  flex-direction: column;
}

.cart-panel.open {
  transform: translateX(0);
}

.cart-panel-head {
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.cart-panel-head h2 {
  margin: 0;
  font-size: 1.1rem;
}

#cart-items {
  flex: 1;
  overflow: auto;
  padding: 1rem 1.25rem;
}

.cart-empty {
  color: var(--muted);
  text-align: center;
  margin-top: 2rem;
}

.cart-line {
  border-bottom: 1px solid var(--border);
  padding-bottom: 0.75rem;
  margin-bottom: 0.75rem;
}

.cart-line-head {
  display: flex;
  justify-content: space-between;
}

.cart-meta {
  font-size: 0.82rem;
  color: var(--muted);
  margin: 0.25rem 0;
}

.cart-qty-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.88rem;
}

.cart-qty {
  width: 4rem;
  padding: 0.35rem;
}

.cart-panel-foot {
  padding: 1rem 1.25rem;
  border-top: 1px solid var(--border);
  background: #f8fafc;
}

.cart-total-row {
  display: flex;
  justify-content: space-between;
  font-weight: 700;
  font-size: 1.05rem;
  margin-bottom: 0.5rem;
}

.cart-demo-note {
  font-size: 0.75rem;
  color: var(--muted);
  margin: 0;
}

#toast {
  position: fixed;
  bottom: 1.25rem;
  left: 50%;
  transform: translateX(-50%) translateY(120%);
  background: var(--navy);
  color: #fff;
  padding: 0.65rem 1.25rem;
  border-radius: 8px;
  font-size: 0.88rem;
  z-index: 200;
  transition: transform 0.25s;
  max-width: min(90vw, 420px);
  text-align: center;
}

#toast.show {
  transform: translateX(-50%) translateY(0);
}

.anim-note {
  font-size: 0.75rem;
  color: var(--muted);
  margin: 0.5rem 0 0;
  text-align: center;
}

@media (max-width: 960px) {
  .step-panel-1 {
    grid-template-columns: 1fr;
  }

  .step1-preview-wrap {
    position: static;
  }

  .stepper-list {
    grid-template-columns: 1fr;
  }

  .mount-pair-grid {
    grid-template-columns: 1fr;
  }

  .refine-grid {
    grid-template-columns: 1fr;
  }

  .result-specs {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .header-inner {
    flex-wrap: wrap;
  }

  .preset-row .btn {
    flex: 1 1 100%;
  }

  .conn-grid {
    grid-template-columns: 1fr 1fr;
  }
}