/* =============================================
   ScrewBoltSize — Industrial / Blueprint design
   ============================================= */

:root {
  --steel-dark:    #1F2933;
  --steel-mid:     #3E4C59;
  --steel-light:   #7B8794;
  --cool-white:    #F5F7FA;
  --off-white:     #E4E7EB;
  --orange:        #F58220;
  --orange-dim:    #C66514;
  --bp-cyan:       #00ACC1;
  --success:       #2E7D32;
  --warn:          #F9A825;

  --steel-panel:   #2A343F;
  --steel-border:  #4A5A68;

  --font-head: "Oswald", "Arial Narrow", sans-serif;
  --font-body: "Inter", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, Consolas, monospace;

  --shadow-card: 0 2px 0 rgba(0,0,0,0.35), 0 8px 20px rgba(0,0,0,0.25);
  --shadow-overlay: 2px 2px 0 rgba(245,130,32,0.15), 4px 4px 0 rgba(0,172,193,0.08);
}

* { box-sizing: border-box; }

html, body { margin: 0; padding: 0; }

body {
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.5;
  color: var(--cool-white);
  background-color: var(--steel-dark);
  /* Blueprint grid */
  background-image:
    linear-gradient(rgba(0,172,193,0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0,172,193,0.045) 1px, transparent 1px),
    linear-gradient(rgba(0,172,193,0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0,172,193,0.025) 1px, transparent 1px);
  background-size: 80px 80px, 80px 80px, 16px 16px, 16px 16px;
  background-position: -1px -1px, -1px -1px, -1px -1px, -1px -1px;
  -webkit-font-smoothing: antialiased;
}

.container {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 20px;
}

h1, h2, h3, h4 {
  font-family: var(--font-head);
  font-weight: 600;
  letter-spacing: 0.02em;
  margin: 0 0 0.4em 0;
  color: var(--cool-white);
  text-transform: uppercase;
}

h2 { font-size: 22px; }
h3 { font-size: 18px; }

p { margin: 0 0 0.75em 0; color: var(--off-white); }

a { color: var(--bp-cyan); text-decoration: none; }
a:hover { color: var(--orange); }

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

.bp { color: var(--bp-cyan); font-family: var(--font-mono); font-weight: 700; margin-right: 4px; }

.bp-cyan { color: var(--bp-cyan); }

/* ============ HEADER ============ */
.site-header {
  background: var(--steel-dark);
  border-bottom: 1px solid var(--steel-border);
  position: relative;
}
.site-header::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: -2px;
  height: 2px;
  background: var(--orange);
}
.header-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}
.logo {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 22px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--cool-white);
}
.logo-primary { color: var(--cool-white); }
.logo-accent  { color: var(--orange); }

.site-nav {
  display: flex;
  gap: 28px;
}
.site-nav a {
  font-family: var(--font-head);
  font-size: 14px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--off-white);
  padding: 8px 2px;
  border-bottom: 2px solid transparent;
  transition: color .15s, border-color .15s;
}
.site-nav a:hover { color: var(--cool-white); }
.site-nav a.active {
  color: var(--orange);
  border-bottom-color: var(--orange);
}

/* ============ HERO / TOOL GRID ============ */
.tool-hero {
  padding: 24px 0 32px 0;
}
.tool-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1.3fr;
  gap: 18px;
}

.panel {
  background: var(--steel-panel);
  border: 1px solid var(--steel-border);
  box-shadow: var(--shadow-card);
  position: relative;
  display: flex;
  flex-direction: column;
}
.panel::before {
  content: "";
  position: absolute;
  top: 0; left: 0; bottom: 0;
  width: 3px;
  background: var(--orange);
  opacity: 0.9;
}
.panel-head {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 16px;
  border-bottom: 1px solid var(--steel-border);
  background: linear-gradient(to bottom, rgba(255,255,255,0.02), transparent);
}
.panel-head h2 {
  margin: 0;
  font-size: 16px;
  letter-spacing: 0.12em;
  flex: 1;
}
.panel-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 26px; height: 26px;
  background: var(--orange);
  color: var(--steel-dark);
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 15px;
}

/* Pick cards */
.pick-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  background: var(--steel-border);
  padding: 1px;
  flex: 1;
}
.pick-card {
  background: var(--steel-mid);
  border: 0;
  color: var(--off-white);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 10px 6px;
  cursor: pointer;
  transition: background .12s, color .12s, box-shadow .12s;
  font-family: var(--font-body);
  font-size: 12px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  min-height: 74px;
  position: relative;
}
.pick-card:hover {
  background: #46545f;
  color: var(--cool-white);
}
.pick-card.active {
  background: var(--steel-dark);
  color: var(--orange);
  box-shadow: inset 0 0 0 2px var(--orange);
}
.pick-card.active::after {
  content: "";
  position: absolute;
  top: 4px; right: 4px;
  width: 6px; height: 6px;
  background: var(--orange);
}
.pick-icon {
  width: 28px; height: 28px;
  stroke: currentColor;
  color: inherit;
}
/* Head icons now contain both top and profile views — 2:1 aspect */
.head-panel .pick-icon {
  width: 56px; height: 28px;
}

/* ============ MEASURE PANEL ============ */
.unit-toggle {
  display: inline-flex;
  border: 1px solid var(--steel-border);
  background: var(--steel-dark);
}
.unit-btn {
  background: transparent;
  border: 0;
  color: var(--off-white);
  font-family: var(--font-mono);
  font-size: 12px;
  padding: 6px 12px;
  cursor: pointer;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.unit-btn.active {
  background: var(--orange);
  color: var(--steel-dark);
  font-weight: 700;
}

.measure-inputs {
  padding: 14px 16px 10px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px 14px;
}

.field { display: flex; flex-direction: column; gap: 4px; }
.field-sub { grid-column: 1 / -1; }
.field-label {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--off-white);
  font-weight: 600;
}
.field-label em { color: var(--steel-light); font-style: normal; font-weight: 400; text-transform: none; }

.input-row {
  display: flex;
  align-items: stretch;
  border: 1px solid var(--steel-border);
  background: var(--steel-dark);
}
.input-row input {
  flex: 1;
  min-width: 0;
  background: transparent;
  border: 0;
  color: var(--cool-white);
  font-family: var(--font-mono);
  font-size: 15px;
  padding: 8px 10px;
  outline: none;
}
.input-row input::placeholder { color: var(--steel-light); }
.input-row:focus-within {
  border-color: var(--orange);
  box-shadow: inset 0 0 0 1px var(--orange);
}
.unit-suffix {
  display: flex;
  align-items: center;
  padding: 0 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--bp-cyan);
  background: rgba(0,172,193,0.08);
  border-left: 1px solid var(--steel-border);
  text-transform: lowercase;
}

/* ============ RESULT CARD ============ */
.result-card {
  margin: 6px 16px 16px;
  padding: 14px;
  background: var(--steel-dark);
  border: 1px solid var(--steel-border);
  border-left: 3px solid var(--bp-cyan);
  position: relative;
}
.result-card.ok { border-left-color: var(--success); }
.result-card.warn { border-left-color: var(--warn); }
.result-card.empty { border-left-color: var(--steel-light); }

.result-status {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--bp-cyan);
  margin-bottom: 6px;
}
.result-status svg {
  width: 18px; height: 18px;
  stroke: currentColor;
}
.result-card.ok .result-status { color: var(--success); }
.result-card.warn .result-status { color: var(--warn); }

.result-designation {
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 700;
  color: var(--cool-white);
  letter-spacing: 0.01em;
  line-height: 1.1;
  margin-bottom: 4px;
  word-break: break-word;
}
.result-descriptor {
  font-size: 13px;
  color: var(--off-white);
  margin-bottom: 10px;
}

.result-diagram-wrap {
  background: rgba(0,172,193,0.04);
  border: 1px dashed var(--steel-border);
  margin: 8px 0 12px 0;
  padding: 6px;
}
.result-diagram {
  width: 100%;
  height: 110px;
  display: block;
}

.result-actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  border: 1px solid var(--steel-border);
  background: var(--steel-mid);
  color: var(--cool-white);
  font-family: var(--font-head);
  font-size: 13px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 8px 12px;
  cursor: pointer;
  transition: background .12s, border-color .12s, color .12s;
  text-decoration: none;
}
.btn svg {
  width: 16px; height: 16px;
  stroke: currentColor;
}
.btn:hover { background: var(--steel-border); color: var(--cool-white); }
.btn[disabled] { opacity: 0.5; cursor: not-allowed; }

.btn-copy { background: var(--steel-panel); }
.btn-copy.copied { background: var(--success); border-color: var(--success); color: #fff; }

.btn-buy {
  background: var(--orange);
  border-color: var(--orange);
  color: var(--steel-dark);
  font-weight: 700;
}
.btn-buy:hover {
  background: var(--orange-dim);
  border-color: var(--orange-dim);
  color: #fff;
}

.result-alts {
  margin-top: 10px;
  font-size: 12px;
  color: var(--off-white);
}
.result-alts .alt {
  display: inline-block;
  font-family: var(--font-mono);
  background: rgba(249,168,37,0.12);
  border: 1px solid rgba(249,168,37,0.35);
  color: var(--warn);
  padding: 2px 8px;
  margin: 3px 4px 0 0;
  cursor: pointer;
}
.result-alts .alt:hover { background: rgba(249,168,37,0.25); }

/* ============ RULER ============ */
.ruler-section { padding: 8px 0 24px 0; }
.ruler-details {
  background: var(--steel-panel);
  border: 1px solid var(--steel-border);
  box-shadow: var(--shadow-card);
}
.ruler-details summary {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 16px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-head);
  font-size: 15px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--cool-white);
}
.ruler-details summary::-webkit-details-marker { display: none; }
.ruler-details summary .chev {
  width: 20px; height: 20px;
  margin-left: auto;
  transition: transform .15s;
  stroke: currentColor;
  color: var(--orange);
}
.ruler-details[open] summary .chev { transform: rotate(90deg); }
.inline-icon {
  width: 20px; height: 20px;
  vertical-align: middle;
  stroke: currentColor;
  color: var(--orange);
}
.ruler-body {
  padding: 12px 16px 16px;
  border-top: 1px solid var(--steel-border);
}
.ruler-help { color: var(--off-white); font-size: 13px; }
.ruler-help strong { color: var(--cool-white); }

.ruler-controls {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 10px;
  font-size: 13px;
  color: var(--off-white);
}
.ruler-controls input[type="range"] {
  width: 240px;
  accent-color: var(--orange);
}

.ruler-stage {
  background: var(--cool-white);
  padding: 10px;
  overflow-x: auto;
}
.ruler-stage svg {
  width: 600px;
  max-width: none;
  height: 90px;
}

/* ============ SECTION HEAD ============ */
.section-head {
  text-align: left;
  margin: 28px 0 14px 0;
  padding-left: 12px;
  border-left: 3px solid var(--orange);
}
.section-head h2 { margin: 0 0 2px 0; }
.section-head p { margin: 0; color: var(--off-white); font-size: 14px; }

/* ============ COMMON SIZES ============ */
.common-sizes { padding: 12px 0 24px 0; }
.tab-strip {
  display: flex;
  gap: 0;
  border-bottom: 1px solid var(--steel-border);
  margin-bottom: 14px;
  flex-wrap: wrap;
}
.tab {
  background: transparent;
  border: 0;
  border-bottom: 2px solid transparent;
  color: var(--off-white);
  font-family: var(--font-head);
  font-size: 13px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 10px 16px;
  cursor: pointer;
  transition: color .12s, border-color .12s;
  margin-bottom: -1px;
}
.tab:hover { color: var(--cool-white); }
.tab.active {
  color: var(--orange);
  border-bottom-color: var(--orange);
}

.preset-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(190px, 1fr));
  gap: 10px;
}
.preset-card {
  background: var(--steel-panel);
  border: 1px solid var(--steel-border);
  padding: 12px;
  cursor: pointer;
  transition: border-color .12s, background .12s;
  text-align: left;
  color: var(--cool-white);
  font-family: var(--font-body);
}
.preset-card:hover { border-color: var(--orange); background: #334050; }
.preset-card .preset-name {
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  color: var(--cool-white);
  margin-bottom: 2px;
}
.preset-card .preset-meta {
  font-size: 11px;
  color: var(--steel-light);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
.preset-card .preset-sub {
  font-size: 12px;
  color: var(--bp-cyan);
  font-family: var(--font-mono);
  margin-top: 4px;
}

/* ============ ARTICLES ============ */
.articles-section { padding: 12px 0 24px 0; }
.article-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(230px, 1fr));
  gap: 14px;
}
.article-card {
  background: var(--steel-panel);
  border: 1px solid var(--steel-border);
  padding: 16px;
  color: var(--cool-white);
  display: flex;
  flex-direction: column;
  transition: border-color .12s, transform .12s;
  box-shadow: var(--shadow-card);
}
.article-card:hover {
  border-color: var(--orange);
  transform: translateY(-2px);
  color: var(--cool-white);
}
.article-icon {
  width: 28px; height: 28px;
  stroke: currentColor;
  color: var(--bp-cyan);
  margin-bottom: 10px;
}
.article-card h3 { margin: 0 0 6px 0; color: var(--cool-white); font-size: 16px; }
.article-card p { flex: 1; font-size: 13px; color: var(--off-white); }
.article-link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  margin-top: 8px;
  color: var(--orange);
  font-family: var(--font-head);
  font-size: 13px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.article-link svg { width: 16px; height: 16px; stroke: currentColor; }
.view-all { text-align: right; margin-top: 14px; }
.view-all a {
  font-family: var(--font-head);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 13px;
  color: var(--orange);
}

/* ============ TOOLS ============ */
.tools-section { padding: 12px 0 24px 0; }
.tool-card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 14px;
}
.tool-card {
  background: var(--steel-panel);
  border: 1px solid var(--steel-border);
  padding: 18px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 8px;
  box-shadow: var(--shadow-card);
}
.tool-card h3 { color: var(--cool-white); margin: 0; }
.tool-card p { font-size: 13px; color: var(--off-white); flex: 1; }
.tool-icon {
  width: 36px; height: 36px;
  stroke: currentColor;
  color: var(--orange);
  margin-bottom: 4px;
}

/* ============ FOOTER ============ */
.site-footer {
  margin-top: 40px;
  background: #18212B;
  border-top: 2px solid var(--orange);
  padding: 18px 0 12px 0;
}
.footer-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
}
.foot-left { display: flex; align-items: center; gap: 16px; }
.foot-left .copy { color: var(--steel-light); font-size: 13px; }
.foot-nav { display: flex; gap: 18px; }
.foot-nav a {
  color: var(--off-white);
  font-size: 13px;
  font-family: var(--font-body);
}
.foot-nav a:hover { color: var(--orange); }
.foot-disclaimer {
  color: var(--steel-light);
  font-size: 12px;
  margin-top: 10px;
  font-style: italic;
  border-top: 1px solid var(--steel-border);
  padding-top: 10px;
}

/* ============ RESPONSIVE ============ */
@media (max-width: 1100px) {
  .tool-grid { grid-template-columns: 1fr 1fr; }
  .measure-panel { grid-column: 1 / -1; }
}

@media (max-width: 820px) {
  .tool-grid { grid-template-columns: 1fr; }
  .measure-panel { grid-column: auto; }
  .pick-grid { grid-template-columns: repeat(4, 1fr); }
  .result-designation { font-size: 20px; }
  .site-nav { gap: 16px; }
  h2 { font-size: 18px; }
  .header-row { height: 54px; }
  .logo { font-size: 18px; }
}

@media (max-width: 520px) {
  .pick-grid { grid-template-columns: repeat(2, 1fr); }
  .measure-inputs { grid-template-columns: 1fr; }
  .footer-row { flex-direction: column; align-items: flex-start; }
}

/* keep hero tool visible on 1366x768: compact paddings */
@media (min-height: 700px) and (min-width: 1100px) {
  .tool-hero { padding-top: 16px; }
  .pick-card { min-height: 68px; }
}

/* ============ ARTICLE PAGES ============ */
.article-container {
  max-width: 880px;
  margin: 24px auto 60px;
  padding: 0 20px;
}
.article-content {
  background: var(--steel-panel);
  border: 1px solid var(--steel-border);
  box-shadow: var(--shadow-card);
  padding: 28px 30px;
  position: relative;
}
.article-content::before {
  content: "";
  position: absolute;
  top: 0; left: 0; bottom: 0;
  width: 3px;
  background: var(--orange);
}
.article-content h1 {
  font-size: 32px;
  text-transform: none;
  letter-spacing: 0.01em;
  line-height: 1.15;
  margin: 6px 0 10px;
}
.article-content h2 {
  font-size: 22px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin: 28px 0 10px;
  border-left: 4px solid var(--orange);
  padding-left: 10px;
}
.article-content h3 {
  font-size: 16px;
  color: var(--bp-cyan);
  letter-spacing: 0.1em;
  margin: 18px 0 8px;
}
.article-content h4 {
  font-size: 15px;
  color: var(--cool-white);
  margin: 12px 0 6px;
  letter-spacing: 0.04em;
}
.article-content p,
.article-content li {
  color: var(--off-white);
  font-size: 15px;
  line-height: 1.6;
}
.article-content ul, .article-content ol { padding-left: 22px; margin: 8px 0 14px; }
.article-content li { margin-bottom: 4px; }
.article-content strong { color: var(--cool-white); }
.article-content em { color: var(--cool-white); font-style: italic; }

.breadcrumb {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--steel-light);
  margin-bottom: 14px;
}
.breadcrumb a { color: var(--steel-light); }
.breadcrumb a:hover { color: var(--orange); }

.article-meta {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--steel-light);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  border-bottom: 1px dashed var(--steel-border);
  padding-bottom: 12px;
  margin-bottom: 16px;
}

.quick-answer {
  background: linear-gradient(180deg, rgba(0,172,193,0.10), rgba(0,172,193,0.03));
  border-left: 4px solid var(--bp-cyan);
  padding: 14px 16px;
  margin: 12px 0 22px;
  font-size: 15px;
  color: var(--cool-white);
}
.quick-answer strong {
  display: inline-block;
  color: var(--bp-cyan);
  font-family: var(--font-head);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  font-size: 12px;
  margin-right: 8px;
}

.chip {
  display: inline-block;
  font-family: var(--font-mono);
  background: #151B22;
  border: 1px solid var(--steel-border);
  color: var(--orange);
  padding: 1px 7px;
  font-size: 0.9em;
  white-space: nowrap;
}

.callout {
  margin: 16px 0;
  padding: 12px 14px;
  border-left: 4px solid var(--orange);
  background: rgba(245,130,32,0.10);
}
.callout strong {
  display: block;
  font-family: var(--font-head);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 12px;
  color: var(--orange);
  margin-bottom: 4px;
}
.callout.tip { border-left-color: var(--bp-cyan); background: rgba(0,172,193,0.10); }
.callout.tip strong { color: var(--bp-cyan); }
.callout.warn { border-left-color: var(--warn); background: rgba(249,168,37,0.10); }
.callout.warn strong { color: var(--warn); }
.callout.danger { border-left-color: #E53935; background: rgba(229,57,53,0.10); }
.callout.danger strong { color: #E53935; }

.article-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 16px 0;
  background: var(--steel-dark);
  border: 1px solid var(--steel-border);
  font-family: var(--font-mono);
  font-size: 13px;
}
.article-content th, .article-content td {
  padding: 8px 10px;
  border-bottom: 1px solid var(--steel-border);
  text-align: left;
}
.article-content th {
  background: #161D25;
  color: var(--orange);
  font-family: var(--font-head);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 12px;
  border-bottom: 2px solid var(--orange);
}
.article-content tbody tr:hover { background: rgba(0,172,193,0.05); }
.article-content tbody tr:last-child td { border-bottom: none; }

.diagram {
  background: #151B22;
  border: 1px solid var(--steel-border);
  padding: 12px;
  margin: 16px 0;
}
.diagram svg {
  width: 100%;
  height: auto;
  display: block;
  color: var(--cool-white);
}
.diagram .caption {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--steel-light);
  margin-top: 8px;
  text-align: center;
}

.cta-box {
  background: linear-gradient(135deg, #1B2129, var(--steel-panel));
  border: 1px solid var(--orange);
  padding: 20px;
  margin: 26px 0;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.cta-box::after {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 20% 0%, rgba(245,130,32,0.18), transparent 60%);
  pointer-events: none;
}
.cta-box h3 {
  color: var(--orange);
  margin: 0 0 6px;
  font-size: 20px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}
.cta-box p { color: var(--off-white); margin: 0 0 12px; }
.cta-button {
  display: inline-block;
  background: var(--orange);
  color: var(--steel-dark) !important;
  font-family: var(--font-head);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  padding: 10px 22px;
  font-size: 14px;
  position: relative;
  z-index: 1;
}
.cta-button:hover { background: var(--orange-dim); color: #fff !important; }

.product-recommendation {
  background: var(--steel-panel);
  border: 1px solid var(--steel-border);
  padding: 18px;
  margin: 24px 0;
}
.product-recommendation h3 { margin-top: 0; color: var(--bp-cyan); }
.product-card {
  display: grid;
  grid-template-columns: 130px 1fr;
  gap: 16px;
  align-items: center;
  background: #151B22;
  border: 1px dashed var(--steel-border);
  padding: 14px;
}
.product-icon {
  width: 130px;
  height: 130px;
  background: var(--steel-dark);
  border: 1px solid var(--steel-border);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--orange);
}
.product-icon svg { width: 80%; height: 80%; }
.product-card h4 {
  margin: 0 0 6px;
  font-family: var(--font-head);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--cool-white);
  font-size: 16px;
}
.product-card p { margin: 0 0 8px; color: var(--off-white); font-size: 14px; }
.product-link {
  display: inline-block;
  margin-top: 4px;
  font-family: var(--font-head);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--steel-dark);
  background: var(--orange);
  border: 0;
  padding: 10px 18px;
  transition: background .15s, transform .1s;
  box-shadow: 0 2px 0 rgba(0,0,0,0.35);
}
.product-link:hover {
  background: var(--orange-hot, #ff9233);
  color: var(--steel-dark);
  transform: translateY(-1px);
}
.product-link:active {
  transform: translateY(0);
  box-shadow: 0 1px 0 rgba(0,0,0,0.35);
}

.faq-section { margin-top: 28px; }
.faq-item {
  background: var(--steel-panel);
  border: 1px solid var(--steel-border);
  padding: 12px 16px;
  margin-bottom: 10px;
}
.faq-item h4 {
  margin: 0 0 6px;
  color: var(--orange);
  font-size: 15px;
  text-transform: none;
  letter-spacing: 0.01em;
}
.faq-item p { margin: 0; color: var(--off-white); }

.related-articles {
  margin-top: 28px;
  padding: 18px 22px;
  background: var(--steel-panel);
  border: 1px solid var(--steel-border);
}
.related-articles h3 {
  margin-top: 0;
  color: var(--bp-cyan);
  font-family: var(--font-head);
  font-size: 14px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}
.related-articles ul { list-style: none; padding: 0; margin: 0; }
.related-articles li {
  padding: 7px 0;
  border-bottom: 1px dashed var(--steel-border);
  font-family: var(--font-mono);
  font-size: 13px;
}
.related-articles li:last-child { border-bottom: none; }
.related-articles li::before { content: "→ "; color: var(--orange); }

@media (max-width: 700px) {
  .article-content { padding: 18px 16px; }
  .article-content h1 { font-size: 24px; }
  .article-content h2 { font-size: 18px; }
  .product-card { grid-template-columns: 1fr; text-align: center; }
  .product-icon { margin: 0 auto; }
  .article-content table { font-size: 12px; }
  .article-content th, .article-content td { padding: 6px 6px; }
}