/* ============================================
   灯带延长线计算器 v5.26 - Hacker Green Theme
   ============================================ */

:root {
  /* Accent color as RGB triplet for transparent overlays */
  --accent-rgb: 61, 220, 132;

  /* Refined palette - Professional Industrial Green */
  --bg-primary: #060d08;
  --bg-secondary: #0f1f14;
  --bg-card: #111f17;
  --bg-input: #0a140e;
  --bg-hover: #1a2e22;

  --green-primary: #3ddc84;
  --green-secondary: #2cb86a;
  --green-dim: #1a8a4a;
  --green-glow: rgba(var(--accent-rgb), 0.12);
  --green-glow-strong: rgba(var(--accent-rgb), 0.25);

  --text-primary: #e8f5e9;
  --text-secondary: #90c695;
  --text-dim: #5ca860;
  --text-muted: #3d7a42;

  --border-color: #1a4a24;
  --border-hover: #2a7a3a;
  --border-glow: #3ddc84;

  --danger: #ff5252;
  --danger-glow: rgba(255, 82, 82, 0.15);
  --warning: #ffb74d;
  --warning-glow: rgba(255, 183, 77, 0.15);
  --success: #3ddc84;
  --success-glow: rgba(var(--accent-rgb), 0.15);

  --font-mono: 'JetBrains Mono', 'SF Mono', 'Consolas', 'Monaco', 'Noto Sans SC', monospace;
  --font-sans: 'Inter', 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', 'Hiragino Sans GB', -apple-system, BlinkMacSystemFont, sans-serif;

  --radius: 8px;
  --radius-sm: 4px;
  --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);

  /* Elevation system */
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.4);
  --shadow-lg: 0 8px 24px rgba(0,0,0,0.5);
  --shadow-glow: 0 0 20px var(--green-glow);
}

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

html {
  font-size: 16px;
  background: var(--bg-primary);
  color: var(--text-primary);
}

body {
  font-family: var(--font-sans);
  line-height: 1.7;
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Background Effects */
.bg-grid {
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(var(--accent-rgb), 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(var(--accent-rgb), 0.03) 1px, transparent 1px);
  background-size: 40px 40px;
  pointer-events: none;
  z-index: 0;
}

.bg-scanline {
  position: fixed;
  inset: 0;
  background: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 2px,
    rgba(var(--accent-rgb), 0.01) 2px,
    rgba(var(--accent-rgb), 0.01) 4px
  );
  pointer-events: none;
  z-index: 0;
}

/* App Layout */
.app {
  position: relative;
  z-index: 1;
  max-width: 1400px;
  margin: 0 auto;
  padding: 1.5rem;
}

/* Header */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem 1.25rem;
  margin-bottom: 1.5rem;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  box-shadow: 0 0 20px var(--green-glow);
}

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

.logo {
  color: var(--green-primary);
  filter: drop-shadow(0 0 8px var(--green-glow-strong));
}

.brand-text h1 {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--green-primary);
  letter-spacing: 0.5px;
  text-shadow: 0 0 10px var(--green-glow-strong);
}

.version {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-muted);
  background: var(--bg-secondary);
  padding: 0.15rem 0.4rem;
  border-radius: 3px;
  border: 1px solid var(--border-color);
}

.version-row {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  margin-top: 0.15rem;
}

.changelog-btn {
  display: inline-flex;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  line-height: 1.7;
  color: var(--text-dim);
  background: transparent;
  border: 1px solid var(--border-color);
  border-radius: 3px;
  padding: 0.15rem 0.4rem;
  cursor: pointer;
  transition: var(--transition);
}

.changelog-btn:hover {
  color: var(--green-primary);
  border-color: var(--green-dim);
  background: var(--green-glow);
}

/* Changelog Modal */
.modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(4px);
}

.modal-panel {
  width: 100%;
  max-width: 560px;
  max-height: 80vh;
  display: flex;
  flex-direction: column;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg), 0 0 30px var(--green-glow);
}

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

.modal-header h3 {
  font-family: var(--font-mono);
  font-size: 1rem;
  color: var(--green-primary);
  margin: 0;
}

.modal-close {
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  color: var(--text-muted);
  background: transparent;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: var(--transition);
}

.modal-close:hover {
  color: var(--text-primary);
  border-color: var(--border-color);
  background: var(--bg-hover);
}

.modal-body {
  padding: 1.25rem;
  overflow-y: auto;
}

.changelog-item {
  display: flex;
  gap: 1rem;
  padding-bottom: 1.25rem;
  margin-bottom: 1.25rem;
  border-bottom: 1px dashed var(--border-color);
}

.changelog-item:last-child {
  border-bottom: none;
  margin-bottom: 0;
  padding-bottom: 0;
}

.changelog-date {
  flex-shrink: 0;
  width: 84px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-dim);
  padding-top: 0.15rem;
}

.changelog-content strong {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--green-primary);
}

.changelog-content ul {
  margin: 0.5rem 0 0 1rem;
  padding: 0;
}

.changelog-content li {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 0.35rem;
  line-height: 1.5;
}

/* Mode Switch */
.mode-switch {
  display: flex;
  gap: 0.25rem;
  background: var(--bg-secondary);
  padding: 0.25rem;
  border-radius: var(--radius);
  border: 1px solid var(--border-color);
}

.mode-btn {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.5rem 1rem;
  border: none;
  background: transparent;
  color: var(--text-muted);
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  border-radius: 4px;
  transition: var(--transition);
}

.mode-btn:hover {
  color: var(--text-secondary);
  background: var(--bg-hover);
}

.mode-btn.active {
  color: var(--green-primary);
  background: var(--green-glow);
  border: 1px solid var(--green-dim);
  box-shadow: 0 0 8px var(--green-glow);
}

.mode-icon {
  font-family: var(--font-mono);
}

/* Status Pill */
.status-pill {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.4rem 0.8rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--green-secondary);
  background: var(--green-glow);
  border: 1px solid var(--green-dim);
  border-radius: 20px;
}

.status-dot {
  width: 6px;
  height: 6px;
  background: var(--green-primary);
  border-radius: 50%;
  box-shadow: 0 0 6px var(--green-primary);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

/* Mode Views */
.mode-view {
  display: none;
}

.mode-view.active {
  display: block;
  animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Workspace */
.workspace {
  display: grid;
  grid-template-columns: 1.45fr 0.8fr;
  gap: 1.25rem;
}

/* Panels */
.panel {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--shadow-md);
  transition: box-shadow var(--transition);
}

.panel:hover {
  box-shadow: var(--shadow-lg);
}

.panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border-color);
}

.panel-head h2 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--green-primary);
  text-transform: uppercase;
  letter-spacing: 1px;
}

/* Algorithm Tabs */
.algo-tabs {
  display: flex;
  gap: 0.6rem;
  margin-bottom: 1.25rem;
}

.algo-tab {
  padding: 0.55rem 1rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-muted);
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  cursor: pointer;
  transition: var(--transition);
}

.algo-tab:hover {
  color: var(--text-secondary);
  border-color: var(--border-hover);
}

.algo-tab.active {
  color: var(--green-primary);
  background: var(--green-glow);
  border-color: var(--green-dim);
  box-shadow: 0 0 6px var(--green-glow);
}

/* Algorithm Fields */
.algo-fields {
  display: none;
}

.algo-fields.active {
  display: block;
  animation: fadeIn 0.2s ease;
}

/* Forms */
.section-title {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 1.5px;
  margin: 1.25rem 0 0.5rem;
  padding-left: 0.5rem;
  border-left: 2px solid var(--green-dim);
}

.grid {
  display: grid;
  gap: 0.75rem;
}

.grid.two { grid-template-columns: repeat(2, 1fr); }
.grid.three { grid-template-columns: repeat(3, 1fr); }

label {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

label span {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-secondary);
  letter-spacing: 0.2px;
}

label span sub {
  font-size: 0.6rem;
  color: var(--text-dim);
}

input, select {
  padding: 0.65rem 0.85rem;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  letter-spacing: 0.3px;
  color: var(--green-primary);
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  outline: none;
  transition: var(--transition);
}

input::placeholder {
  color: var(--text-muted);
  opacity: 0.6;
}

input:hover, select:hover {
  border-color: var(--border-hover);
}

input:focus, select:focus {
  border-color: var(--border-glow);
  box-shadow: 0 0 0 3px var(--green-glow), 0 0 16px var(--green-glow);
}

select {
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%234caf50' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.6rem center;
  padding-right: 1.8rem;
}

/* ============================================
   Field Classification - Required / Auto / Optional
   ============================================ */

/* Required fields - bright green left border + dot indicator */
.field-required {
  position: relative;
}

.field-required::before {
  content: '';
  position: absolute;
  left: -0.6rem;
  top: 1.6rem;
  bottom: 0.3rem;
  width: 3px;
  background: var(--green-primary);
  border-radius: 2px;
  box-shadow: 0 0 8px var(--green-glow-strong);
}

.field-required span::before {
  content: '● ';
  color: var(--green-primary);
  font-size: 0.6rem;
  vertical-align: middle;
}

/* Auto-filled fields - dim green left border + muted background */
.field-auto {
  position: relative;
  background: var(--green-glow);
  border-radius: var(--radius);
  padding: 0.35rem 0.5rem;
  margin: -0.35rem -0.5rem;
}

.field-auto::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.3rem;
  bottom: 0.3rem;
  width: 3px;
  background: var(--green-dim);
  border-radius: 2px;
}

.field-auto span::after {
  content: ' [自动]';
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--text-dim);
  font-weight: 400;
}

.field-auto input,
.field-auto select {
  background: var(--bg-hover);
  border-color: var(--green-dim);
  color: var(--green-secondary);
}

/* Optional fields - subtle dashed border */
.field-optional {
  position: relative;
}

.field-optional::before {
  content: '';
  position: absolute;
  left: -0.6rem;
  top: 1.6rem;
  bottom: 0.3rem;
  width: 3px;
  background: var(--text-muted);
  border-radius: 2px;
  opacity: 0.4;
}

.field-optional span::after {
  content: ' [可选]';
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--text-muted);
  font-weight: 400;
}

/* Section grouping headers */
.field-group-title {
  grid-column: 1 / -1;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-secondary);
  letter-spacing: 0.5px;
  margin: 0.75rem 0 0.25rem;
  padding: 0.4rem 0.6rem;
  background: var(--bg-secondary);
  border-left: 3px solid var(--border-hover);
  border-radius: 0 var(--radius) var(--radius) 0;
}

/* Field legend at top of form */
.field-legend {
  display: flex;
  gap: 1rem;
  margin-bottom: 0.75rem;
  padding: 0.4rem 0.6rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  font-family: var(--font-mono);
  font-size: 0.75rem;
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 0.3rem;
}

.legend-required {
  color: var(--green-primary);
}

.legend-auto {
  color: var(--green-dim);
}

.legend-optional {
  color: var(--text-muted);
}

/* Auto-fill flash animation */
@keyframes autoFillFlash {
  0% { background: var(--green-glow); box-shadow: 0 0 12px var(--green-glow-strong); }
  100% { background: var(--bg-hover); box-shadow: none; }
}

.auto-fill-flash input,
.auto-fill-flash select {
  animation: autoFillFlash 0.8s ease;
}

/* ============================================
   CALCULATOR SECTIONS - Priority-based layout
   ============================================ */

.calc-section {
  margin-bottom: 1.25rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border-color);
}

.calc-section:last-of-type {
  border-bottom: none;
}

/* Section header with badge */
.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.5rem;
}

.section-header h3 {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--green-primary);
  letter-spacing: 0.5px;
}

.section-desc {
  font-size: 0.8rem;
  color: var(--text-dim);
  margin-bottom: 0.75rem;
  margin-top: -0.25rem;
}

.section-badge {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  font-weight: 600;
  padding: 0.2rem 0.5rem;
  border-radius: 3px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.section-badge.tier-1 {
  color: var(--bg-primary);
  background: var(--green-primary);
  box-shadow: 0 0 8px var(--green-glow-strong);
}

.section-badge.tier-2 {
  color: var(--bg-primary);
  background: var(--green-primary);
  border: 1px solid var(--green-dim);
  box-shadow: 0 0 8px var(--green-glow-strong);
}

.section-badge.tier-3 {
  color: var(--bg-primary);
  background: var(--green-primary);
  border: 1px solid var(--green-dim);
  box-shadow: 0 0 8px var(--green-glow-strong);
}

/* ===== Product Selection Section (Prominent) ===== */
.product-select-section {
  background: var(--bg-secondary);
  border: 1px solid var(--border-hover);
  border-radius: var(--radius);
  padding: 1rem 1.25rem;
  margin: -0.5rem -0.5rem 1.25rem;
  box-shadow: 0 0 20px var(--green-glow);
}

.model-search-row {
  display: grid;
  grid-template-columns: 0.8fr 1.6fr 0.9fr;
  gap: 0.75rem;
  margin-bottom: 0.75rem;
}

.model-material-wrap select,
.model-select-wrap select,
.model-input-wrap input {
  width: 100%;
}

.model-material-wrap label span,
.model-select-wrap label span,
.model-input-wrap label span {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--green-primary);
}

/* Product Info Card */
.product-info-card {
  background: linear-gradient(135deg, rgba(var(--accent-rgb), 0.06) 0%, var(--bg-input) 100%);
  border: 1px solid var(--green-dim);
  border-radius: var(--radius);
  animation: fadeIn 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: var(--shadow-sm), inset 0 1px 0 rgba(var(--accent-rgb), 0.05);
  overflow: hidden;
}

.product-info-card details > summary {
  list-style: none;
}

.product-info-card details > summary::-webkit-details-marker {
  display: none;
}

.info-card-summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  padding: 1rem 1.25rem;
  cursor: pointer;
  user-select: none;
  transition: var(--transition);
}

.info-card-summary:hover {
  background: rgba(var(--accent-rgb), 0.04);
}

.info-card-header {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  flex-wrap: wrap;
}

.info-card-header strong {
  font-family: var(--font-mono);
  font-size: 1.05rem;
  color: var(--green-primary);
  letter-spacing: 0.3px;
}

.info-card-tag {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  padding: 0.2rem 0.5rem;
  background: rgba(var(--accent-rgb), 0.1);
  border: 1px solid var(--green-dim);
  border-radius: var(--radius-sm);
  color: var(--green-secondary);
}

.info-card-header strong::before {
  content: '▸';
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--green-primary);
  text-shadow: 0 0 8px var(--green-glow-strong);
  transition: transform 0.2s ease;
  display: inline-block;
  margin-right: 0.4rem;
}

.product-info-card details[open] .info-card-header strong::before {
  transform: rotate(90deg);
}

.info-card-body {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 0.6rem;
  padding: 0 1.25rem 1rem;
  animation: fadeIn 0.25s ease;
}

.info-card-item {
  text-align: center;
  padding: 0.5rem 0.3rem;
  background: rgba(0, 0, 0, 0.2);
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  transition: var(--transition);
}

.info-card-item:hover {
  border-color: var(--border-hover);
  background: rgba(var(--accent-rgb), 0.04);
}

.info-card-item span {
  display: block;
  font-size: 0.65rem;
  color: var(--text-muted);
  margin-bottom: 0.2rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.info-card-item strong {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--text-secondary);
}

/* ===== Collapsible Sections ===== */
.collapsible-section {
  margin: 0.75rem 0;
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  background: var(--bg-secondary);
  overflow: hidden;
}

.collapsible-section summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.7rem 1rem;
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
  cursor: pointer;
  user-select: none;
  background: var(--bg-hover);
  border-bottom: 1px solid transparent;
  transition: var(--transition);
}

.collapsible-section summary:hover {
  color: var(--green-primary);
  background: var(--bg-card);
}

.collapsible-section[open] summary {
  border-bottom-color: var(--border-color);
}

.collapsible-section summary > span:first-child {
  display: flex;
  align-items: center;
}

.collapsible-section summary > span:first-child::before,
.formula-box summary::before,
.info-card-header strong::before {
  content: '▸';
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--green-primary);
  text-shadow: 0 0 8px var(--green-glow-strong);
  transition: transform 0.2s ease;
  display: inline-block;
  margin-right: 0.4rem;
}

.collapsible-section[open] summary > span:first-child::before,
.formula-box[open] summary::before,
.product-info-card details[open] .info-card-header strong::before {
  transform: rotate(90deg);
}

.collapsible-hint {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 400;
  color: var(--text-muted);
}

.collapsible-section > .grid,
.collapsible-section > .algo-fields {
  padding: 0.75rem 1rem;
  animation: fadeIn 0.2s ease;
}

.collapsible-section .algo-fields {
  display: none;
}

.collapsible-section .algo-fields.active {
  display: block;
}

/* Formula Box */
.formula-box {
  margin-top: 1rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  background: var(--bg-secondary);
}

.formula-box summary {
  padding: 0.6rem 0.8rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-dim);
  cursor: pointer;
  user-select: none;
}

.formula-box summary:hover {
  color: var(--text-secondary);
}

.formula-content {
  padding: 0.8rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-secondary);
  line-height: 1.8;
  border-top: 1px solid var(--border-color);
}

.formula-content strong {
  color: var(--green-primary);
}

.formula-content sub {
  font-size: 0.65rem;
}

/* Result Panel */
.result-panel {
  position: sticky;
  top: 1.5rem;
  height: fit-content;
}

.result-hero {
  padding: 1.5rem;
  border-radius: var(--radius);
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  text-align: center;
  margin-bottom: 1rem;
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.result-hero.success {
  border-color: var(--green-dim);
  background: linear-gradient(135deg, rgba(var(--accent-rgb), 0.08) 0%, var(--bg-secondary) 100%);
  box-shadow: var(--shadow-sm), 0 0 20px var(--success-glow);
}

.result-hero.warning {
  border-color: #b88700;
  background: linear-gradient(135deg, rgba(255, 183, 77, 0.06) 0%, var(--bg-secondary) 100%);
  box-shadow: var(--shadow-sm), 0 0 20px var(--warning-glow);
}

.result-hero.danger {
  border-color: #b71c1c;
  background: linear-gradient(135deg, rgba(255, 82, 82, 0.06) 0%, var(--bg-secondary) 100%);
  box-shadow: var(--shadow-sm), 0 0 20px var(--danger-glow);
}

.verdict-label {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: var(--text-muted);
  margin-bottom: 0.3rem;
}

.result-hero strong {
  display: block;
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--green-primary);
  text-shadow: 0 0 16px var(--green-glow-strong);
  letter-spacing: 0.5px;
}

.result-hero p {
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-top: 0.3rem;
}

/* Metrics */
.metrics {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.6rem;
  margin-bottom: 1rem;
}

.metric {
  padding: 0.875rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  transition: var(--transition);
}

.metric:hover {
  border-color: var(--border-hover);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.metric span {
  display: block;
  font-size: 0.7rem;
  color: var(--text-muted);
  margin-bottom: 0.25rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.metric strong {
  font-family: var(--font-mono);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--green-primary);
}

/* Length Cards */
.length-card {
  padding: 1.25rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  text-align: center;
  margin-bottom: 0.75rem;
  transition: var(--transition);
}

.length-card:hover {
  border-color: var(--border-hover);
}

.length-card span {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 0.3rem;
}

.length-card strong {
  display: block;
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: 0.5px;
}

.length-card small {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-dim);
  margin-top: 0.3rem;
}

.length-card.recommended {
  border-color: var(--green-dim);
  background: linear-gradient(135deg, rgba(var(--accent-rgb), 0.1) 0%, var(--bg-secondary) 100%);
  box-shadow: var(--shadow-sm), 0 0 16px var(--green-glow);
}

.length-card.recommended strong {
  color: var(--green-primary);
  text-shadow: 0 0 12px var(--green-glow-strong);
}

/* Breakdown */
.breakdown h3 {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 1.5px;
  margin: 1rem 0 0.5rem;
  padding-left: 0.5rem;
  border-left: 2px solid var(--green-dim);
}

.breakdown ol {
  list-style: none;
  counter-reset: step;
}

.breakdown li {
  position: relative;
  padding: 0.5rem 0 0.5rem 1.5rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-secondary);
  border-bottom: 1px solid rgba(27, 94, 32, 0.3);
}

.breakdown li::before {
  counter-increment: step;
  content: counter(step, decimal-leading-zero);
  position: absolute;
  left: 0;
  font-size: 0.7rem;
  color: var(--green-dim);
  font-weight: 600;
}

/* Buttons */
.ghost-btn {
  padding: 0.4rem 0.8rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-dim);
  background: transparent;
  border: 1px solid var(--border-color);
  border-radius: 4px;
  cursor: pointer;
  transition: var(--transition);
}

.ghost-btn:hover {
  color: var(--green-primary);
  border-color: var(--green-dim);
  background: var(--green-glow);
}

.btn-primary {
  padding: 0.6rem 1.2rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--bg-primary);
  background: var(--green-primary);
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  transition: var(--transition);
  box-shadow: 0 0 12px var(--green-glow-strong);
}

.btn-primary:hover {
  background: var(--green-secondary);
  box-shadow: 0 0 20px var(--green-glow-strong);
  transform: translateY(-1px);
}

.btn-secondary {
  padding: 0.6rem 1.2rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--text-secondary);
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  cursor: pointer;
  transition: var(--transition);
}

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

/* Toast */
.toast {
  position: fixed;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  padding: 0.7rem 1.5rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--green-primary);
  background: var(--bg-card);
  border: 1px solid var(--green-dim);
  border-radius: var(--radius);
  box-shadow: 0 0 20px var(--green-glow);
  opacity: 0;
  pointer-events: none;
  transition: all 0.3s ease;
  z-index: 100;
}

.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* ============================
   SELECTOR WIZARD STYLES
   ============================ */

.selector-workspace {
  grid-template-columns: 1fr;
}

/* Wizard Progress */
.wizard-progress {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0;
  margin-bottom: 1.5rem;
  padding: 1rem;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
}

.step {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.3rem;
  padding: 0.5rem 1rem;
  opacity: 0.4;
  cursor: pointer;
  user-select: none;
  border-radius: var(--radius-sm);
  transition: var(--transition);
}

.step:hover {
  opacity: 0.8;
  background: var(--bg-hover);
}

.step.active {
  opacity: 1;
  cursor: default;
}

.step.active:hover {
  background: transparent;
}

.step.completed {
  opacity: 1;
}

.step-num {
  font-family: var(--font-mono);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-muted);
}

.step.active .step-num {
  color: var(--green-primary);
  text-shadow: 0 0 8px var(--green-glow-strong);
}

.step.completed .step-num {
  color: var(--green-primary);
}

.step.completed .step-label {
  color: var(--green-primary);
}

.step.completed + .step-connector,
.step-connector.completed {
  background: var(--green-primary);
  box-shadow: 0 0 8px var(--green-glow-strong);
}

.step-label {
  font-size: 0.7rem;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 1px;
}

.step-connector {
  width: 40px;
  height: 1px;
  background: var(--border-color);
}

/* Wizard Panels */
.wizard-panel {
  display: none;
  animation: fadeIn 0.3s ease;
}

.wizard-panel.active {
  display: block;
}

.panel-title {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--green-primary);
  margin-bottom: 0.3rem;
  text-shadow: 0 0 8px var(--green-glow);
}

.panel-desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 1.25rem;
}

/* Type Cards */
.type-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}

.type-card {
  padding: 1.5rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  text-align: left;
  cursor: pointer;
  transition: var(--transition);
}

.type-card:hover {
  border-color: var(--green-dim);
  background: var(--bg-hover);
  box-shadow: 0 0 16px var(--green-glow);
  transform: translateY(-2px);
}

.type-card.selected {
  border-color: var(--green-primary);
  background: var(--green-glow);
  box-shadow: 0 0 16px var(--green-glow-strong);
}

.hidden-product-list {
  display: none !important;
}

.type-card:active {
  transform: translateY(0);
}

.type-card-disabled {
  opacity: 0.45;
  cursor: not-allowed;
  pointer-events: none;
}

.type-card-disabled:hover {
  transform: none;
  border-color: var(--border-dim);
  box-shadow: none;
}

.type-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: 700;
  color: var(--green-primary);
  background: var(--green-glow);
  border: 1px solid var(--green-dim);
  border-radius: var(--radius);
  margin-bottom: 1rem;
  box-shadow: 0 0 12px var(--green-glow);
}

.type-card h3 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.4rem;
}

.type-card p {
  font-size: 0.8rem;
  color: var(--text-secondary);
  line-height: 1.5;
  margin-bottom: 0.75rem;
}

.type-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
}

.tag {
  padding: 0.2rem 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-dim);
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: 3px;
}

/* Product Select Row */
.select-row {
  display: flex;
  gap: 1rem;
  margin-bottom: 0.75rem;
}

.select-row label {
  flex: 1;
}

.select-row select,
.select-row input {
  width: 100%;
}

/* Product List */
.product-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 0.6rem;
  max-height: 400px;
  overflow-y: auto;
  padding-right: 0.5rem;
}

.product-list::-webkit-scrollbar {
  width: 4px;
}

.product-list::-webkit-scrollbar-track {
  background: var(--bg-secondary);
}

.product-list::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 2px;
}

.product-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  cursor: pointer;
  transition: var(--transition);
}

.product-item:hover {
  border-color: var(--green-dim);
  background: var(--bg-hover);
}

.product-item.selected {
  border-color: var(--green-primary);
  background: var(--green-glow);
  box-shadow: 0 0 8px var(--green-glow);
}

.product-item .code {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--green-primary);
}

.product-item .meta {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-muted);
}

/* Spec Grid */
.spec-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
  margin: 1rem 0;
}

.spec-field span {
  font-size: 0.75rem;
  color: var(--text-secondary);
  margin-bottom: 0.3rem;
}

.selected-product-bar {
  padding: 0.75rem 1rem;
  background: var(--green-glow);
  border: 1px solid var(--green-dim);
  border-radius: var(--radius);
  margin-bottom: 1rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--green-primary);
}

/* Wizard Nav */
.wizard-nav {
  display: flex;
  gap: 0.75rem;
  justify-content: flex-end;
  margin-top: 1.5rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border-color);
}

/* Result Dashboard */
.result-dashboard {
  display: grid;
  gap: 1rem;
}

.result-dashboard .result-section {
  padding: 1rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
}

.result-section h4 {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 0.75rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border-color);
}

.awg-table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--font-mono);
  font-size: 0.8rem;
}

.awg-table th,
.awg-table td {
  padding: 0.5rem 0.75rem;
  text-align: left;
  border-bottom: 1px solid rgba(27, 94, 32, 0.3);
}

.awg-table th {
  color: var(--text-muted);
  font-weight: 600;
  text-transform: uppercase;
  font-size: 0.7rem;
  letter-spacing: 0.5px;
}

.awg-table td {
  color: var(--text-secondary);
}

.awg-table td.recommended {
  color: var(--green-primary);
  font-weight: 600;
}

.awg-table tr:hover td {
  background: var(--bg-hover);
}

/* ============================================
   INPUT VALIDATION & FEEDBACK
   ============================================ */

input.input-error,
select.input-error {
  border-color: var(--danger) !important;
  box-shadow: 0 0 0 2px var(--danger-glow), 0 0 8px var(--danger-glow) !important;
  animation: shake 0.4s ease;
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  20% { transform: translateX(-4px); }
  40% { transform: translateX(4px); }
  60% { transform: translateX(-4px); }
  80% { transform: translateX(4px); }
}

.validation-msg {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--danger);
  margin-top: 0.2rem;
  min-height: 1rem;
}

label:has(.input-error) .validation-msg::before {
  content: '⚠ ';
}

/* Result Actions */
.result-actions {
  display: flex;
  gap: 0.4rem;
}

/* History Section */
.history-section {
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border-color);
}

.history-section h3 {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 1.5px;
  margin-bottom: 0.5rem;
  padding-left: 0.5rem;
  border-left: 2px solid var(--green-dim);
}

.history-list {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.history-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.5rem 0.6rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  cursor: pointer;
  transition: var(--transition);
  font-family: var(--font-mono);
  font-size: 0.8rem;
}

.history-item:hover {
  border-color: var(--green-dim);
  background: var(--bg-hover);
}

.history-item .history-meta {
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.history-item .history-result {
  color: var(--green-primary);
  font-weight: 600;
}

.history-item .history-time {
  font-size: 0.65rem;
  color: var(--text-muted);
}

/* Empty state */
.empty-state {
  text-align: center;
  padding: 2rem;
  color: var(--text-muted);
  font-size: 0.85rem;
}

/* ============================================
   ACCESSIBILITY & INTERACTION
   ============================================ */

/* Enhanced focus states */
input:focus-visible,
select:focus-visible,
button:focus-visible,
summary:focus-visible {
  outline: 2px solid var(--green-primary);
  outline-offset: 2px;
  box-shadow: 0 0 0 4px var(--green-glow), 0 0 16px var(--green-glow-strong);
}

/* Smooth transitions for result panel */
.result-hero,
.metric,
.length-card {
  transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

.result-hero.success {
  animation: verdictPulse 0.5s ease;
}

@keyframes verdictPulse {
  0% { transform: scale(0.98); }
  50% { transform: scale(1.01); }
  100% { transform: scale(1); }
}

.metric:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(var(--accent-rgb), 0.08);
}

/* Onboarding tooltip */
.onboarding-tip {
  position: relative;
  background: var(--green-glow);
  border: 1px dashed var(--green-dim);
  border-radius: var(--radius);
  padding: 0.6rem 0.8rem;
  margin-bottom: 0.75rem;
  font-size: 0.8rem;
  color: var(--text-secondary);
  animation: tipFadeIn 0.5s ease;
}

@keyframes tipFadeIn {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 1; transform: translateY(0); }
}

.onboarding-tip .tip-dismiss {
  position: absolute;
  top: 0.3rem;
  right: 0.5rem;
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 1rem;
  cursor: pointer;
  padding: 0;
  line-height: 1;
}

.onboarding-tip .tip-dismiss:hover {
  color: var(--green-primary);
}

/* Keyboard hint */
.kbd-hint {
  display: inline-flex;
  align-items: center;
  gap: 0.2rem;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--text-muted);
  background: var(--bg-secondary);
  padding: 0.15rem 0.4rem;
  border-radius: 3px;
  border: 1px solid var(--border-color);
}

/* Responsive */
@media (max-width: 1020px) {
  .workspace {
    grid-template-columns: 1fr;
  }
  
  .result-panel {
    position: static;
  }
  
  .type-cards {
    grid-template-columns: 1fr;
  }
  
  .spec-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .topbar {
    flex-wrap: wrap;
  }
  
  .mode-switch {
    order: 3;
    width: 100%;
  }
}

@media (max-width: 720px) {
  .app {
    padding: 0.75rem;
  }
  
  .grid.two,
  .grid.three {
    grid-template-columns: 1fr;
  }
  
  .metrics {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .wizard-progress {
    padding: 0.5rem;
  }
  
  .step-label {
    display: none;
  }
  
  .spec-grid {
    grid-template-columns: 1fr;
  }
  
  .select-row {
    flex-direction: column;
    gap: 0.75rem;
  }
  
  .field-required::before,
  .field-optional::before {
    left: -0.4rem;
  }

  /* Calculator responsive */
  .model-search-row {
    grid-template-columns: 1fr;
  }

  .info-card-body {
    grid-template-columns: repeat(3, 1fr);
  }

  .section-header {
    flex-wrap: wrap;
    gap: 0.3rem;
  }

  .collapsible-section summary {
    flex-wrap: wrap;
    gap: 0.3rem;
  }

  .result-actions {
    flex-wrap: wrap;
    gap: 0.3rem;
  }

  .history-item {
    flex-wrap: wrap;
    gap: 0.3rem;
  }