/* WeldRef — Mobile-First Dark Industrial */

@import url('https://fonts.googleapis.com/css2?family=Doto:wght@400;700&family=Big+Shoulders+Text:wght@400;600;700;900&family=Figtree:wght@300;400;500;600;700&family=Fira+Code:wght@400;500;700&display=swap');

:root {
  --bg:             #09090B;
  --surface:        #101012;
  --surface-raised: #161618;
  --border:         #1D1D20;
  --border-visible: #2A2A2E;
  --text-disabled:  #4A4A52;
  --text-secondary: #7A7A86;
  --text-primary:   #E0DFE8;
  --text-display:   #F5F4FF;
  --accent:         #FF7A1A;
  --accent-subtle:  rgba(255, 122, 26, 0.10);
  --success:        #3FB96A;
  --warning:        #D4A843;
  --danger:         #E0242D;
  --interactive:    #5B9BF6;
  --nav-h:          60px;
  --header-h:       52px;
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
}

html { height: 100%; }

body {
  background: var(--bg);
  color: var(--text-primary);
  font-family: 'Figtree', system-ui, sans-serif;
  font-size: 16px;
  line-height: 1.5;
  height: 100%;
  overflow: hidden;
}

/* ─── HEADER ─────────────────────────────────────────────────────────────── */

header {
  height: var(--header-h);
  background: var(--bg);
  border-bottom: 1px solid var(--border-visible);
  position: relative;
  overflow: hidden;
  flex-shrink: 0;
}

header::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image: radial-gradient(circle, #282828 1px, transparent 1px);
  background-size: 20px 20px;
  opacity: 0.35;
  pointer-events: none;
}

header::after {
  content: '';
  position: absolute;
  bottom: -40px;
  left: -5%;
  width: 40%;
  height: 80px;
  background: radial-gradient(ellipse at center, rgba(255, 122, 26, 0.10) 0%, transparent 70%);
  pointer-events: none;
}

.header-inner {
  height: 100%;
  max-width: 900px;
  margin: 0 auto;
  padding: 0 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: relative;
}

.app-title {
  font-family: 'Doto', monospace;
  font-size: 32px;
  font-weight: 700;
  color: var(--text-display);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  text-shadow: 0 0 30px rgba(255, 122, 26, 0.2);
}

.header-badge {
  font-family: 'Fira Code', monospace;
  font-size: 10px;
  color: var(--accent);
  border: 1px solid var(--accent);
  border-radius: 4px;
  padding: 4px 10px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  white-space: nowrap;
}

.env-chip {
  font-family: 'Fira Code', monospace;
  font-size: 10px;
  font-weight: 700;
  color: #111;
  background: var(--accent);
  border-radius: 4px;
  padding: 4px 8px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  white-space: nowrap;
  margin-left: 8px;
}
.env-chip[hidden] { display: none; }

/* ─── MAIN / PAGES ────────────────────────────────────────────────────────── */

main {
  position: fixed;
  top: var(--header-h);
  left: 0;
  right: 0;
  bottom: var(--nav-h);
  overflow: hidden;
}

.page {
  display: none;
  position: absolute;
  inset: 0;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  overscroll-behavior-y: contain;
}

.page.active {
  display: block;
  animation: pageReveal 260ms cubic-bezier(0.22, 1, 0.36, 1) both;
}

/* ─── SUB-NAV (sticky within page) ───────────────────────────────────────── */

.sub-nav {
  position: sticky;
  top: 0;
  z-index: 20;
  background: var(--bg);
  border-bottom: 1px solid var(--border-visible);
  padding: 10px 16px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  -ms-overflow-style: none;
  scrollbar-width: none;
  flex-shrink: 0;
}

.sub-nav::-webkit-scrollbar { display: none; }

.sub-btn {
  background: transparent;
  border: 1px solid var(--border-visible);
  border-radius: 999px;
  color: var(--text-secondary);
  cursor: pointer;
  font-family: 'Fira Code', monospace;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 7px 18px;
  min-height: 36px;
  white-space: nowrap;
  flex-shrink: 0;
  transition: color 160ms ease, border-color 160ms ease, background 160ms ease;
}

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

.sub-btn.active {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--bg);
  font-weight: 700;
}

.sub-content { display: none; }
.sub-content.active { display: block; }

/* ─── CARD ────────────────────────────────────────────────────────────────── */

.card {
  background: var(--surface);
  border: 1px solid var(--border-visible);
  border-radius: 8px;
  padding: 20px 16px;
  margin: 14px 14px 24px;
}

@media (min-width: 480px) {
  .card { padding: 24px; margin: 16px 16px 28px; }
}

.card-title {
  font-family: 'Big Shoulders Text', sans-serif;
  font-size: 24px;
  font-weight: 900;
  color: var(--text-display);
  letter-spacing: 0.03em;
  text-transform: uppercase;
  margin-bottom: 4px;
}

.section-desc {
  color: var(--text-secondary);
  font-size: 14px;
  line-height: 1.6;
  margin-bottom: 20px;
}

/* ─── SELECTORS ───────────────────────────────────────────────────────────── */

.selectors {
  display: flex;
  gap: 20px;
  flex-direction: column;
  margin-bottom: 24px;
}

@media (min-width: 540px) {
  .selectors { flex-direction: row; flex-wrap: wrap; }
  .selector-group { flex: 1; min-width: 160px; }
}

.selector-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.selector-group label {
  font-family: 'Fira Code', monospace;
  font-size: 11px;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.selector-group select {
  appearance: none;
  -webkit-appearance: none;
  background: transparent url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%237A7A86' stroke-width='1.5' fill='none' stroke-linecap='round'/%3E%3C/svg%3E") no-repeat right 4px center;
  border: none;
  border-bottom: 1px solid var(--border-visible);
  border-radius: 0;
  color: var(--text-primary);
  font-family: 'Fira Code', monospace;
  font-size: 14px;
  padding: 10px 24px 10px 0;
  cursor: pointer;
  outline: none;
  min-height: 44px;
  transition: border-color 160ms ease;
  width: 100%;
}

.selector-group select:focus {
  border-bottom-color: var(--accent);
  box-shadow: 0 2px 0 0 var(--accent);
}

.selector-group select option {
  background: #1a1a1e;
  color: var(--text-primary);
}

/* ─── RESULT CARDS ────────────────────────────────────────────────────────── */

.result-card {
  background: var(--surface-raised);
  border: 1px solid var(--border-visible);
  border-left: 3px solid var(--accent);
  border-radius: 0 6px 6px 0;
  overflow: hidden;
  animation: fadeIn 200ms ease;
}

.result-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 16px;
  border-bottom: 1px solid var(--border-visible);
  background: var(--accent-subtle);
  gap: 10px;
}

.result-card h3 {
  font-family: 'Fira Code', monospace;
  font-size: 11px;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.copy-btn {
  background: transparent;
  border: 1px solid var(--border-visible);
  border-radius: 4px;
  color: var(--text-disabled);
  cursor: pointer;
  font-family: 'Fira Code', monospace;
  font-size: 9px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 4px 10px;
  white-space: nowrap;
  flex-shrink: 0;
  transition: color 160ms ease, border-color 160ms ease;
}

.copy-btn:hover { color: var(--accent); border-color: var(--accent); }
.copy-btn.copied { color: var(--success); border-color: var(--success); }

.params-table { width: 100%; border-collapse: collapse; }
.params-table tr { border-bottom: 1px solid var(--border); transition: background 120ms ease; }
.params-table tr:last-child { border-bottom: none; }
.params-table tbody tr:hover { background: rgba(255,122,26,0.04); }

.param-label {
  font-family: 'Fira Code', monospace;
  color: var(--text-secondary);
  font-size: 11px;
  padding: 10px 12px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  white-space: nowrap;
  width: 140px;
  vertical-align: top;
}

.param-value {
  font-family: 'Fira Code', monospace;
  color: var(--text-primary);
  font-size: 13px;
  font-variant-numeric: tabular-nums;
  padding: 10px 12px 10px 0;
  vertical-align: top;
}

.notes-row .param-value {
  color: var(--text-secondary);
  font-size: 12px;
}

/* ─── FILLER CARDS ────────────────────────────────────────────────────────── */

.filler-card {
  background: var(--surface-raised);
  border: 1px solid var(--border-visible);
  border-left: 3px solid var(--success);
  border-radius: 0 6px 6px 0;
  margin-bottom: 12px;
  overflow: hidden;
  animation: fadeIn 200ms ease;
}

.filler-header {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 14px;
  border-bottom: 1px solid var(--border-visible);
  flex-wrap: wrap;
}

.aws-class {
  font-family: 'Fira Code', monospace;
  background: transparent;
  border: 1px solid var(--border-visible);
  color: var(--text-display);
  font-weight: 700;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 4px 12px;
  border-radius: 999px;
  white-space: nowrap;
}

.filler-desc { color: var(--text-secondary); font-size: 14px; }

.filler-table { width: 100%; border-collapse: collapse; }
.filler-table tr { border-bottom: 1px solid var(--border); }
.filler-table tr:last-child { border-bottom: none; }

/* ─── DISCLAIMER / EMPTY ──────────────────────────────────────────────────── */

.disclaimer {
  border: 1px solid var(--border-visible);
  border-radius: 4px;
  color: var(--text-secondary);
  font-family: 'Fira Code', monospace;
  font-size: 11px;
  letter-spacing: 0.04em;
  margin-top: 16px;
  padding: 10px 14px;
}

.no-result {
  font-family: 'Fira Code', monospace;
  color: var(--text-secondary);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 16px 0;
}

/* ─── PROCESS PICKER ──────────────────────────────────────────────────────── */

.process-picker {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 20px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border-visible);
}

.proc-btn {
  background: transparent;
  border: 1px solid var(--border-visible);
  border-radius: 999px;
  color: var(--text-secondary);
  cursor: pointer;
  font-family: 'Fira Code', monospace;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 8px 20px;
  min-height: 44px;
  transition: border-color 160ms ease, color 160ms ease, background 160ms ease;
}

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

.proc-btn.active {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--bg);
  font-weight: 700;
}

/* ─── GUIDE STYLES ────────────────────────────────────────────────────────── */

.guide-intro {
  color: var(--text-secondary);
  font-size: 14px;
  margin-bottom: 20px;
  line-height: 1.7;
}

.guide-section-title {
  font-family: 'Big Shoulders Text', sans-serif;
  font-size: 13px;
  font-weight: 700;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.15em;
  border-bottom: 1px solid var(--border-visible);
  padding-bottom: 8px;
  margin: 24px 0 14px;
}

.guide-card {
  background: var(--surface-raised);
  border: 1px solid var(--border-visible);
  border-radius: 6px;
  padding: 14px 16px;
  margin-bottom: 10px;
  animation: fadeIn 200ms ease;
}

.guide-header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
  flex-wrap: wrap;
}

.guide-badge {
  background: var(--accent-subtle);
  border: 1px solid var(--accent);
  color: var(--accent);
  font-family: 'Fira Code', monospace;
  font-weight: 700;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 4px 12px;
  border-radius: 999px;
  white-space: nowrap;
}

.guide-spec { color: var(--text-secondary); font-size: 14px; }

.ss-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
}

@media (min-width: 540px) {
  .ss-grid { grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); }
}

.ss-card {
  background: var(--surface-raised);
  border: 1px solid var(--border-visible);
  border-radius: 6px;
  padding: 12px 14px;
  animation: fadeIn 200ms ease;
}

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

.checklist-item {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  background: var(--surface-raised);
  border: 1px solid var(--border-visible);
  border-radius: 6px;
  padding: 12px 14px;
}

.checklist-step {
  background: var(--accent-subtle);
  border: 1px solid var(--accent);
  color: var(--accent);
  font-family: 'Fira Code', monospace;
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 3px 8px;
  border-radius: 4px;
  white-space: nowrap;
  flex-shrink: 0;
  margin-top: 2px;
}

.checklist-question { color: var(--text-primary); font-weight: 500; font-size: 15px; margin-bottom: 4px; }
.checklist-guidance { color: var(--text-secondary); font-size: 14px; line-height: 1.6; }

/* ─── TROUBLESHOOTING ─────────────────────────────────────────────────────── */

.trouble-card {
  margin-bottom: 12px;
}

.trouble-lists {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-top: 12px;
}

@media (min-width: 600px) {
  .trouble-lists { flex-direction: row; gap: 20px; }
  .trouble-lists > div { flex: 1; }
}

.trouble-list-title {
  font-family: 'Fira Code', monospace;
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 8px;
}

.trouble-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.trouble-list li {
  display: flex;
  gap: 8px;
  align-items: flex-start;
  font-size: 13px;
  color: var(--text-primary);
  line-height: 1.5;
}

.trouble-list li .bullet {
  flex-shrink: 0;
  margin-top: 3px;
  font-size: 10px;
}

.trouble-ref {
  font-family: 'Fira Code', monospace;
  font-size: 10px;
  color: var(--text-disabled);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-top: 12px;
  padding-top: 10px;
  border-top: 1px solid var(--border);
}

/* ─── CALCULATORS ─────────────────────────────────────────────────────────── */

.calc-block {
  background: var(--surface-raised);
  border: 1px solid var(--border-visible);
  border-radius: 8px;
  padding: 18px 16px;
  margin-bottom: 14px;
}

.calc-title {
  font-family: 'Big Shoulders Text', sans-serif;
  font-size: 20px;
  font-weight: 700;
  color: var(--text-display);
  letter-spacing: 0.03em;
  text-transform: uppercase;
  margin-bottom: 8px;
}

.calc-formula {
  font-family: 'Fira Code', monospace;
  font-size: 11px;
  color: var(--accent);
  background: var(--accent-subtle);
  border-left: 2px solid var(--accent);
  padding: 6px 10px;
  margin-bottom: 8px;
  border-radius: 0 3px 3px 0;
}

.calc-note { font-size: 13px; color: var(--text-secondary); margin-bottom: 12px; }

.calc-inputs {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  align-items: flex-end;
  margin-top: 14px;
}

.ce-inputs {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
  gap: 12px;
  align-items: end;
}

.calc-field {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 130px;
}

.calc-field label {
  font-family: 'Fira Code', monospace;
  font-size: 11px;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.calc-field input,
.calc-field select {
  appearance: none;
  -webkit-appearance: none;
  background: transparent;
  border: none;
  border-bottom: 1px solid var(--border-visible);
  border-radius: 0;
  color: var(--text-primary);
  font-family: 'Fira Code', monospace;
  font-size: 14px;
  padding: 8px 0;
  outline: none;
  min-height: 44px;
  transition: border-color 160ms ease, box-shadow 160ms ease;
  width: 100%;
}

.calc-field select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%237A7A86' stroke-width='1.5' fill='none' stroke-linecap='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 4px center;
  padding-right: 24px;
  cursor: pointer;
}

.calc-field select option { background: #1a1a1e; color: var(--text-primary); }

.calc-field input::placeholder { color: var(--text-disabled); }

.calc-field input:focus,
.calc-field select:focus {
  border-bottom-color: var(--accent);
  box-shadow: 0 2px 0 0 var(--accent);
}

/* Remove number input spinners */
input[type="number"]::-webkit-inner-spin-button,
input[type="number"]::-webkit-outer-spin-button { -webkit-appearance: none; margin: 0; }
input[type="number"] { -moz-appearance: textfield; }

.calc-btn {
  background: var(--accent);
  border: none;
  border-radius: 999px;
  color: var(--bg);
  cursor: pointer;
  font-family: 'Fira Code', monospace;
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 10px 24px;
  min-height: 44px;
  align-self: flex-end;
  transition: opacity 160ms ease;
  white-space: nowrap;
}

.calc-btn:hover { opacity: 0.82; }
.calc-btn:active { opacity: 0.7; transform: scale(0.98); }

.calc-output-card {
  margin-top: 14px;
  background: var(--surface);
  border: 1px solid var(--border-visible);
  border-left: 3px solid var(--accent);
  border-radius: 0 6px 6px 0;
  overflow: hidden;
  animation: fadeIn 200ms ease;
}

.calc-row {
  display: flex;
  gap: 10px;
  align-items: baseline;
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
}

.calc-row:last-child { border-bottom: none; }

.calc-row-label {
  font-family: 'Fira Code', monospace;
  color: var(--text-secondary);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  min-width: 160px;
  flex-shrink: 0;
}

.calc-row-value {
  font-family: 'Fira Code', monospace;
  color: var(--text-primary);
  font-size: 13px;
  font-variant-numeric: tabular-nums;
  line-height: 1.5;
}

.highlight-green  { background: rgba(74, 158, 92, 0.08); }
.highlight-yellow { background: rgba(212, 168, 67, 0.08); }
.highlight-orange { background: rgba(224, 123, 16, 0.08); }
.highlight-red    { background: rgba(215, 25, 33, 0.10); }

.highlight-green  .calc-row-value { color: var(--success); }
.highlight-yellow .calc-row-value { color: var(--warning); }
.highlight-orange .calc-row-value { color: var(--accent); }
.highlight-red    .calc-row-value { color: var(--danger); }

.calc-error {
  margin-top: 12px;
  border: 1px solid var(--border-visible);
  border-left: 3px solid var(--danger);
  border-radius: 0 4px 4px 0;
  font-family: 'Fira Code', monospace;
  color: var(--danger);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 10px 14px;
}

/* ─── INNER SUB-NAV (AWS tabs inside Ref page) ────────────────────────────── */

.inner-sub-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 18px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border-visible);
}

.sub-tab-btn {
  background: transparent;
  border: 1px solid var(--border-visible);
  border-radius: 4px;
  color: var(--text-secondary);
  cursor: pointer;
  font-family: 'Fira Code', monospace;
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 6px 14px;
  min-height: 36px;
  transition: border-color 160ms ease, color 160ms ease;
}

.sub-tab-btn:hover { border-color: var(--accent); color: var(--accent); }

.sub-tab-btn.active {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--bg);
  font-weight: 700;
}

/* ─── AWS REFERENCE ───────────────────────────────────────────────────────── */

.aws-ref-card {
  background: var(--surface);
  border: 1px solid var(--border-visible);
  border-left: 3px solid var(--accent);
  border-radius: 0 6px 6px 0;
  margin-bottom: 12px;
  overflow: hidden;
  animation: fadeIn 200ms ease;
}

.aws-ref-header {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 14px;
  border-bottom: 1px solid var(--border-visible);
  background: var(--accent-subtle);
  flex-wrap: wrap;
}

.aws-group-badge {
  font-family: 'Fira Code', monospace;
  font-weight: 700;
  font-size: 14px;
  color: var(--accent);
  white-space: nowrap;
}

.aws-proc-tag {
  font-family: 'Fira Code', monospace;
  font-size: 11px;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.aws-table-wrap {
  overflow-x: auto;
  border: 1px solid var(--border-visible);
  border-radius: 6px;
  animation: fadeIn 200ms ease;
  -webkit-overflow-scrolling: touch;
}

.aws-table {
  width: 100%;
  border-collapse: collapse;
  font-family: 'Fira Code', monospace;
  font-size: 12px;
  min-width: 500px;
}

.aws-table thead tr {
  background: var(--surface-raised);
  border-bottom: 2px solid var(--border-visible);
}

.aws-table th {
  text-align: left;
  padding: 10px 12px;
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-secondary);
  white-space: nowrap;
}

.aws-table td {
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
  color: var(--text-primary);
  vertical-align: top;
  line-height: 1.55;
}

.aws-table tbody tr:last-child td { border-bottom: none; }
.aws-table tbody tr { transition: background 120ms ease; }
.aws-table tbody tr:hover { background: rgba(255,122,26,0.04); }
.aws-group-cell { font-weight: 700; color: var(--accent) !important; white-space: nowrap; }
.aws-notes-cell { color: var(--text-secondary) !important; font-size: 11px; }

/* ─── WELD SYMBOLS ────────────────────────────────────────────────────────── */

.sym-builder { display: flex; flex-direction: column; gap: 14px; }

.sym-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  align-items: flex-end;
  padding: 16px;
  background: var(--surface);
  border: 1px solid var(--border-visible);
  border-radius: 8px;
}

.sym-check-group { display: flex; flex-direction: column; gap: 10px; justify-content: flex-end; padding-bottom: 8px; }

.sym-check-label {
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  font-family: 'Fira Code', monospace;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-secondary);
}

.sym-check-label input[type="checkbox"] {
  width: 16px;
  height: 16px;
  accent-color: var(--accent);
  cursor: pointer;
}

.sym-preview { border-radius: 6px; overflow: hidden; line-height: 0; }
.sym-description { padding: 4px 0; }

.sym-desc-text {
  font-family: 'Figtree', sans-serif;
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
}

.sym-desc-text strong { color: var(--text-primary); font-weight: 600; }

.sym-card-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
}

@media (min-width: 500px) {
  .sym-card-grid { grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); }
}

.sym-card {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  background: var(--surface-raised);
  border: 1px solid var(--border-visible);
  border-radius: 6px;
  padding: 12px 14px;
  animation: fadeIn 200ms ease;
}

.sym-card-svg { flex-shrink: 0; border: 1px solid var(--border-visible); border-radius: 4px; overflow: hidden; line-height: 0; }
.sym-card-body { min-width: 0; }

.sym-card-name {
  font-family: 'Fira Code', monospace;
  font-size: 11px;
  font-weight: 700;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 4px;
}

.sym-card-use { font-family: 'Figtree', sans-serif; font-size: 13px; color: var(--text-primary); line-height: 1.5; margin-bottom: 4px; }
.sym-card-note { font-family: 'Fira Code', monospace; font-size: 11px; color: var(--text-secondary); line-height: 1.5; }

/* ─── BOTTOM NAV ──────────────────────────────────────────────────────────── */

.bottom-nav {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--nav-h);
  background: var(--surface);
  border-top: 1px solid var(--border-visible);
  display: flex;
  padding-bottom: env(safe-area-inset-bottom, 0px);
}

.nav-btn {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 3px;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text-disabled);
  transition: color 160ms ease;
  padding: 6px 4px;
  min-height: 44px;
  position: relative;
}

.nav-btn::after {
  content: '';
  position: absolute;
  top: 0;
  left: 25%;
  right: 25%;
  height: 2px;
  background: var(--accent);
  border-radius: 0 0 2px 2px;
  opacity: 0;
  transition: opacity 160ms ease;
}

.nav-btn.active { color: var(--accent); }
.nav-btn.active::after { opacity: 1; }
.nav-btn:hover:not(.active) { color: var(--text-secondary); }

.nav-btn svg { width: 22px; height: 22px; flex-shrink: 0; }

.nav-btn span {
  font-family: 'Fira Code', monospace;
  font-size: 9px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  white-space: nowrap;
}

/* ─── ANIMATIONS ──────────────────────────────────────────────────────────── */

@keyframes fadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}

@keyframes pageReveal {
  from { opacity: 0; transform: translateY(6px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ─── TOAST NOTIFICATION ─────────────────────────────────────────────────── */

.toast {
  position: fixed;
  bottom: calc(var(--nav-h) + 16px);
  left: 50%;
  transform: translateX(-50%) translateY(8px);
  background: var(--surface-raised);
  border: 1px solid var(--border-visible);
  border-radius: 999px;
  color: var(--text-primary);
  font-family: 'Fira Code', monospace;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 8px 18px;
  white-space: nowrap;
  z-index: 200;
  opacity: 0;
  transition: opacity 200ms ease, transform 200ms ease;
  pointer-events: none;
}

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

/* ─── BUTTON ACTIVE STATE ─────────────────────────────────────────────────── */

button:active { transform: scale(0.97); }
.calc-btn:active { transform: scale(0.97); opacity: 0.85; }
.nav-btn:active { transform: none; }

/* ─── KEY PARAM HIGHLIGHT ─────────────────────────────────────────────────── */

.param-key {
  background: rgba(255,122,26,0.06);
  border-left: 2px solid var(--accent);
}

.param-key .param-label { color: var(--accent); }
.param-key .param-value { color: var(--text-display); font-weight: 600; }

/* ─── AI SYMBOL ANALYZER ─────────────────────────────────────────────────── */

.ai-key-section {
  background: var(--surface-raised);
  border: 1px solid var(--border-visible);
  border-left: 3px solid var(--interactive);
  border-radius: 0 6px 6px 0;
  padding: 14px 16px;
  margin-bottom: 20px;
}

.ai-key-label {
  font-family: 'Fira Code', monospace;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--interactive);
  margin-bottom: 6px;
}

.ai-key-hint {
  font-size: 12px;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 12px;
}

.ai-key-row {
  display: flex;
  gap: 10px;
  align-items: flex-end;
  flex-wrap: wrap;
}

.ai-key-row input {
  flex: 1;
  min-width: 200px;
  background: transparent;
  border: none;
  border-bottom: 1px solid var(--border-visible);
  color: var(--text-primary);
  font-family: 'Fira Code', monospace;
  font-size: 13px;
  padding: 8px 0;
  outline: none;
  min-height: 44px;
  transition: border-color 160ms ease;
}

.ai-key-row input:focus { border-bottom-color: var(--interactive); }

.ai-key-status {
  font-family: 'Fira Code', monospace;
  font-size: 11px;
  margin-top: 8px;
  letter-spacing: 0.06em;
}

.ai-upload-zone {
  border: 2px dashed var(--border-visible);
  border-radius: 10px;
  padding: 36px 20px;
  text-align: center;
  cursor: pointer;
  transition: border-color 200ms ease, background 200ms ease;
  margin-bottom: 16px;
  position: relative;
}

.ai-upload-zone:hover,
.ai-upload-zone:active {
  border-color: var(--accent);
  background: var(--accent-subtle);
}

.ai-upload-icon {
  color: var(--text-disabled);
  margin-bottom: 12px;
  transition: color 200ms ease;
}

.ai-upload-zone:hover .ai-upload-icon { color: var(--accent); }

.ai-upload-text {
  font-family: 'Big Shoulders Text', sans-serif;
  font-size: 17px;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: 0.02em;
  margin-bottom: 6px;
}

.ai-upload-hint {
  font-size: 12px;
  color: var(--text-secondary);
}

.ai-preview-wrap {
  position: relative;
  margin-bottom: 16px;
  border-radius: 8px;
  overflow: hidden;
  border: 1px solid var(--border-visible);
}

.ai-preview-img {
  width: 100%;
  max-height: 320px;
  object-fit: contain;
  background: #0c0c0e;
  display: block;
}

.ai-clear-btn {
  position: absolute;
  top: 8px;
  right: 8px;
  background: rgba(0,0,0,0.7);
  border: 1px solid var(--border-visible);
  border-radius: 999px;
  color: var(--text-secondary);
  cursor: pointer;
  font-family: 'Fira Code', monospace;
  font-size: 10px;
  padding: 5px 12px;
  transition: color 160ms ease, border-color 160ms ease;
}

.ai-clear-btn:hover { color: var(--danger); border-color: var(--danger); }

.ai-analyze-btn {
  width: 100%;
  margin-bottom: 20px;
  font-size: 13px;
  padding: 14px 24px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  transition: opacity 200ms ease, background 200ms ease;
}

.ai-analyze-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.ai-analyze-btn.loading {
  background: var(--surface-raised);
  color: var(--accent);
  border: 1px solid var(--accent);
  cursor: wait;
}

@keyframes spin { to { transform: rotate(360deg); } }

.ai-spinner {
  width: 14px;
  height: 14px;
  border: 2px solid var(--accent);
  border-top-color: transparent;
  border-radius: 50%;
  animation: spin 700ms linear infinite;
  flex-shrink: 0;
}

/* AI result cards */
.ai-result-block {
  animation: fadeIn 300ms ease;
}

.ai-field {
  display: flex;
  gap: 12px;
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
  align-items: flex-start;
  transition: background 120ms ease;
}

.ai-field:last-child { border-bottom: none; }
.ai-field:hover { background: rgba(255,122,26,0.04); }

.ai-field-label {
  font-family: 'Fira Code', monospace;
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.09em;
  color: var(--text-secondary);
  min-width: 130px;
  flex-shrink: 0;
  padding-top: 2px;
}

.ai-field-value {
  font-family: 'Fira Code', monospace;
  font-size: 13px;
  color: var(--text-primary);
  line-height: 1.6;
  flex: 1;
}

.ai-field-value.highlight { color: var(--accent); font-weight: 700; }

.ai-description-box {
  background: var(--surface-raised);
  border-radius: 6px;
  padding: 14px 16px;
  margin-top: 14px;
  border-left: 3px solid var(--interactive);
}

.ai-description-title {
  font-family: 'Fira Code', monospace;
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--interactive);
  margin-bottom: 10px;
}

.ai-description-text {
  font-size: 14px;
  color: var(--text-primary);
  line-height: 1.75;
}

.ai-warning-box {
  background: rgba(212,168,67,0.07);
  border: 1px solid rgba(212,168,67,0.25);
  border-radius: 6px;
  padding: 10px 14px;
  margin-top: 12px;
  font-size: 12px;
  color: var(--warning);
  font-family: 'Fira Code', monospace;
  line-height: 1.6;
}

.ai-error-box {
  background: rgba(224,36,45,0.07);
  border: 1px solid rgba(224,36,45,0.25);
  border-radius: 6px;
  padding: 12px 16px;
  margin-top: 12px;
  font-family: 'Fira Code', monospace;
  font-size: 12px;
  color: var(--danger);
  line-height: 1.6;
}

/* ─── WELD INSPECTOR ──────────────────────────────────────────────────────── */

.wi-context-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  margin-bottom: 20px;
}

@media (max-width: 440px) {
  .wi-context-grid { grid-template-columns: 1fr; }
}

.wi-verdict {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px 16px;
  border-radius: 8px;
  margin-bottom: 16px;
  border: 1px solid;
}

.wi-verdict.accept  { background: rgba(63,185,106,0.08); border-color: rgba(63,185,106,0.35); }
.wi-verdict.reject  { background: rgba(224,36,45,0.08);  border-color: rgba(224,36,45,0.35); }
.wi-verdict.further { background: rgba(212,168,67,0.08); border-color: rgba(212,168,67,0.35); }

.wi-verdict-icon { font-size: 28px; flex-shrink: 0; line-height: 1; }

.wi-verdict-label {
  font-family: 'Big Shoulders Text', sans-serif;
  font-size: 22px;
  font-weight: 900;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.wi-verdict.accept  .wi-verdict-label { color: var(--success); }
.wi-verdict.reject  .wi-verdict-label { color: var(--danger); }
.wi-verdict.further .wi-verdict-label { color: var(--warning); }

.wi-verdict-sub {
  font-size: 12px;
  color: var(--text-secondary);
  margin-top: 2px;
}

.wi-defect-card {
  background: var(--surface-raised);
  border: 1px solid var(--border-visible);
  border-radius: 8px;
  margin-bottom: 10px;
  overflow: hidden;
  animation: fadeIn 250ms ease;
}

.wi-defect-header {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  border-bottom: 1px solid var(--border-visible);
  flex-wrap: wrap;
}

.wi-defect-name {
  font-family: 'Big Shoulders Text', sans-serif;
  font-size: 16px;
  font-weight: 700;
  color: var(--text-display);
  letter-spacing: 0.02em;
  flex: 1;
}

.wi-severity {
  font-family: 'Fira Code', monospace;
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  padding: 3px 10px;
  border-radius: 999px;
  border: 1px solid;
  white-space: nowrap;
}

.wi-severity.critical { color: var(--danger);  border-color: var(--danger);  background: rgba(224,36,45,0.1); }
.wi-severity.moderate { color: var(--warning); border-color: var(--warning); background: rgba(212,168,67,0.1); }
.wi-severity.minor    { color: var(--success); border-color: var(--success); background: rgba(63,185,106,0.1); }

.wi-ar-badge {
  font-family: 'Fira Code', monospace;
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 3px 10px;
  border-radius: 4px;
  white-space: nowrap;
}

.wi-ar-badge.reject { background: rgba(224,36,45,0.15); color: var(--danger); }
.wi-ar-badge.accept { background: rgba(63,185,106,0.12); color: var(--success); }

.wi-defect-body { padding: 12px 14px; }

.wi-defect-row {
  display: flex;
  gap: 10px;
  padding: 7px 0;
  border-bottom: 1px solid var(--border);
  align-items: flex-start;
}

.wi-defect-row:last-child { border-bottom: none; }

.wi-defect-label {
  font-family: 'Fira Code', monospace;
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-secondary);
  min-width: 110px;
  flex-shrink: 0;
  padding-top: 1px;
}

.wi-defect-val {
  font-size: 13px;
  color: var(--text-primary);
  line-height: 1.6;
  flex: 1;
}

.wi-action-section {
  background: var(--surface-raised);
  border: 1px solid var(--border-visible);
  border-radius: 8px;
  overflow: hidden;
  margin-bottom: 14px;
}

.wi-action-header {
  padding: 10px 14px;
  border-bottom: 1px solid var(--border-visible);
  font-family: 'Fira Code', monospace;
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.wi-action-header.immediate { color: var(--danger);      background: rgba(224,36,45,0.06); }
.wi-action-header.process   { color: var(--warning);     background: rgba(212,168,67,0.06); }
.wi-action-header.prevent   { color: var(--interactive); background: rgba(91,155,246,0.06); }

.wi-action-list {
  list-style: none;
  padding: 10px 14px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.wi-action-list li {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  font-size: 13px;
  color: var(--text-primary);
  line-height: 1.6;
}

.wi-action-list li::before {
  content: '▸';
  flex-shrink: 0;
  margin-top: 2px;
  font-size: 10px;
}

.wi-action-header.immediate + .wi-action-list li::before { color: var(--danger); }
.wi-action-header.process   + .wi-action-list li::before { color: var(--warning); }
.wi-action-header.prevent   + .wi-action-list li::before { color: var(--interactive); }

.wi-notes-box {
  background: var(--surface-raised);
  border: 1px solid var(--border-visible);
  border-left: 3px solid var(--accent);
  border-radius: 0 8px 8px 0;
  padding: 14px 16px;
  margin-bottom: 14px;
}

.wi-notes-title {
  font-family: 'Fira Code', monospace;
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent);
  margin-bottom: 8px;
}

.wi-notes-text {
  font-size: 13px;
  color: var(--text-primary);
  line-height: 1.75;
}

.wi-nde-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(91,155,246,0.1);
  border: 1px solid rgba(91,155,246,0.3);
  border-radius: 6px;
  padding: 10px 14px;
  margin-bottom: 14px;
  width: 100%;
}

.wi-nde-label {
  font-family: 'Fira Code', monospace;
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-secondary);
  flex-shrink: 0;
}

.wi-nde-val {
  font-family: 'Fira Code', monospace;
  font-size: 13px;
  font-weight: 700;
  color: var(--interactive);
}

/* ─── DESKTOP ADJUSTMENTS ─────────────────────────────────────────────────── */

@media (min-width: 700px) {
  .card { max-width: 860px; margin-left: auto; margin-right: auto; }
  .param-label { width: 180px; }
  .calc-row-label { min-width: 200px; }
}

/* ─── PROSE LIST (privacy/terms pages) ──────────────────────────────────── */
.prose-list {
  margin: 0;
  padding-left: 20px;
  font-size: 14px;
  line-height: 1.6;
  color: var(--text);
}
.prose-list li { margin-bottom: 12px; }
.prose-list strong { color: var(--accent); }
.prose-list code {
  font-family: 'Fira Code', monospace;
  font-size: 12px;
  background: #0A0A0A;
  padding: 2px 6px;
  border-radius: 3px;
  color: #E0E0E0;
}
.about-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
  font-size: 14px;
}
.about-grid strong { color: var(--accent); margin-right: 8px; }
.about-grid a { color: var(--accent); }

/* ─── MODAL (disclosure, confirms) ───────────────────────────────────────── */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.7);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  z-index: 1000;
  opacity: 0;
  pointer-events: none;
  transition: opacity 150ms ease;
}
.modal-backdrop.show {
  opacity: 1;
  pointer-events: auto;
}
.modal-dialog {
  background: #1A1A1A;
  border: 1px solid #2A2A2A;
  border-radius: 8px;
  max-width: 480px;
  width: 100%;
  padding: 24px;
  color: var(--text);
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.6);
}
.modal-title {
  margin: 0 0 16px 0;
  font-size: 18px;
  color: var(--accent);
}
.modal-list {
  margin: 0 0 20px 0;
  padding-left: 20px;
  font-size: 14px;
  line-height: 1.55;
}
.modal-list li { margin-bottom: 10px; }
.modal-list strong { color: var(--accent); }
.modal-actions {
  display: flex;
  gap: 10px;
  justify-content: flex-end;
  flex-wrap: wrap;
}
.modal-actions .btn-primary,
.modal-actions .btn-secondary {
  min-height: 44px;
  padding: 10px 18px;
  border-radius: 6px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  border: 1px solid transparent;
}
.modal-actions .btn-primary {
  background: var(--accent);
  color: #111;
  border-color: var(--accent);
}
.modal-actions .btn-secondary {
  background: transparent;
  color: var(--text);
  border-color: #333;
}