/* ============================================================
   sinasolar design system v4 — "monochrome workshop"
   Direction C (Klein-style restraint): near-white ground,
   hard 1.5px ink rules, zero soft shadows, square corners,
   IBM Plex Mono display/data + Inter body.
   Colour discipline: black & white carry the page; brand red
   #D31E26 appears ONLY on interaction (hover underlines, focus,
   active thumbs) and primary RFQ CTAs; brand gold lives in the
   logo only. Dark panels are flat near-black with a faint
   drafting grid.
   ============================================================ */

@font-face{font-family:"Plex Mono";src:url("assets/fonts/plexmono-500.woff2") format("woff2");font-weight:500;font-display:swap}
@font-face{font-family:"Plex Mono";src:url("assets/fonts/plexmono-600.woff2") format("woff2");font-weight:600;font-display:swap}
@font-face{font-family:"Plex Mono";src:url("assets/fonts/plexmono-700.woff2") format("woff2");font-weight:700;font-display:swap}
@font-face{font-family:"Inter";src:url("assets/fonts/inter-400.woff2") format("woff2");font-weight:400;font-display:swap}
@font-face{font-family:"Inter";src:url("assets/fonts/inter-500.woff2") format("woff2");font-weight:500;font-display:swap}
@font-face{font-family:"Inter";src:url("assets/fonts/inter-600.woff2") format("woff2");font-weight:600;font-display:swap}

:root {
  /* monochrome ground */
  --ground: #FBFBFA;
  --paper: #F3F3F1;
  --card: #FFFFFF;
  --ink: #141414;
  --ink-2: #3A3A38;
  --muted: #6A6A66;
  --hair: #DCDCD8;
  --rule: #141414;

  /* brand red: interaction + primary CTA only */
  --accent: #D31E26;
  --accent-bright: #E8404B;
  --accent-ink: #FFFFFF;

  /* dark workshop panel */
  --dark: #141414;
  --dark-2: #1C1C1A;
  --dark-text: #F6F6F4;
  --dark-muted: #A3A39D;
  --line-dark: rgba(246, 246, 244, 0.15);

  --mono: "Plex Mono", ui-monospace, "Cascadia Code", Menlo, Consolas, monospace;
  --font: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;

  --radius: 0;
  --radius-s: 0;
  --shadow: none;
  --shadow-s: none;

  /* legacy aliases (inline styles on secondary pages) */
  --line: var(--hair);
  --white: var(--card);
  --panel: var(--paper);
  --brand: var(--accent);
  --brand-dark: var(--accent);
  --brand-ghost: rgba(211, 30, 38, 0.07);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 84px;
}

body {
  margin: 0;
  color: var(--ink);
  font-family: var(--font);
  font-size: 15.5px;
  line-height: 1.62;
  background: var(--ground);
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
  text-decoration: none;
}

img {
  display: block;
  max-width: 100%;
}

button {
  font: inherit;
}

h1, h2, h3, h4 {
  font-family: var(--mono);
  font-weight: 600;
  letter-spacing: -0.015em;
}

::selection {
  background: var(--accent);
  color: var(--accent-ink);
}

a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible,
summary:focus-visible {
  outline: 2.5px solid var(--accent);
  outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
  * {
    transition: none !important;
    animation: none !important;
  }

  html {
    scroll-behavior: auto;
  }
}

/* ---------- header ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--ground);
  border-bottom: 1.5px solid var(--rule);
  color: var(--ink);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1240px;
  min-height: 66px;
  margin: 0 auto;
  padding: 0 24px;
  gap: 24px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 11px;
  flex: none;
}

.brand-logo {
  height: 34px;
  width: auto;
  display: block;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 2px;
  font-family: var(--mono);
  font-size: 12.5px;
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.nav-links > a,
.nav-drop > a {
  padding: 9px 12px;
  color: var(--muted);
  transition: color 0.13s;
}

.nav-links > a:hover,
.nav-drop > a:hover,
.nav-links > a[aria-current="page"] {
  color: var(--ink);
  text-decoration: underline;
  text-underline-offset: 5px;
  text-decoration-thickness: 2px;
  text-decoration-color: var(--accent);
}

.nav-links .btn {
  margin-left: 10px;
}

/* beat .nav-links > a specificity for the CTA */

.nav-links a.btn {
  color: var(--ground);
}

.nav-links a.btn:hover {
  color: var(--accent-ink);
  text-decoration: none;
}

/* products mega dropdown */

.nav-drop {
  position: relative;
}

.nav-drop > a::after {
  content: " ▾";
  font-size: 10px;
  opacity: 0.7;
}

.drop-panel {
  position: absolute;
  top: calc(100% + 0px);
  left: 50%;
  transform: translateX(-50%);
  display: grid;
  grid-template-columns: repeat(2, 235px);
  gap: 2px;
  padding: 10px;
  border: 1.5px solid var(--rule);
  background: var(--ground);
  color: var(--ink);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.15s, visibility 0.15s;
}

.nav-drop:hover .drop-panel,
.nav-drop:focus-within .drop-panel {
  opacity: 1;
  visibility: visible;
}

.drop-panel a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 9px 12px;
  font-family: var(--font);
  font-size: 13.5px;
  font-weight: 500;
  letter-spacing: 0;
  text-transform: none;
  color: var(--ink-2);
}

.drop-panel a:hover {
  background: var(--paper);
  color: var(--ink);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-color: var(--accent);
}

.drop-panel a span {
  color: var(--muted);
  font-family: var(--mono);
  font-size: 11.5px;
  font-weight: 500;
}

.drop-panel.cols-1 {
  grid-template-columns: 230px;
}

.drop-panel .drop-all {
  grid-column: 1 / -1;
  justify-content: center;
  border-top: 1.5px solid var(--rule);
  margin-top: 8px;
  padding-top: 12px;
  color: var(--ink);
  font-family: var(--mono);
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

/* ---------- buttons ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  min-height: 45px;
  padding: 0 22px;
  border: 1.5px solid var(--ink);
  background: var(--ink);
  color: var(--ground);
  font-family: var(--mono);
  font-weight: 600;
  font-size: 12.5px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  cursor: pointer;
  transition: background 0.13s, border-color 0.13s, color 0.13s;
}

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

.btn.secondary {
  background: transparent;
  color: var(--ink);
  border-color: var(--rule);
}

.btn.secondary:hover {
  background: var(--ink);
  color: var(--ground);
}

.btn.ghost-dark {
  background: transparent;
  border-color: rgba(246, 246, 244, 0.45);
  color: var(--dark-text);
}

.btn.ghost-dark:hover {
  background: var(--dark-text);
  border-color: var(--dark-text);
  color: var(--ink);
}

/* primary RFQ CTA keeps standing red */

.rfq .btn {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--accent-ink);
}

.rfq .btn:hover {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--ground);
}

/* ---------- hero (dark workshop panel) ---------- */

.hero {
  position: relative;
  overflow: hidden;
  color: var(--dark-text);
  background:
    linear-gradient(rgba(246, 246, 244, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(246, 246, 244, 0.045) 1px, transparent 1px),
    var(--dark);
  background-size: 34px 34px, 34px 34px, auto;
  border-bottom: 1.5px solid var(--rule);
}

.hero-inner {
  position: relative;
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 56px;
  align-items: center;
  max-width: 1240px;
  margin: 0 auto;
  padding: 84px 24px 76px;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-family: var(--mono);
  font-weight: 500;
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink);
}

.eyebrow::before {
  content: "";
  width: 18px;
  height: 2px;
  background: currentColor;
  flex: none;
}

.hero .eyebrow,
.page-hero .eyebrow,
.contact-band .eyebrow {
  color: var(--dark-muted);
}

.hero h1 {
  margin: 18px 0 16px;
  font-size: clamp(32px, 4.2vw, 50px);
  line-height: 1.06;
  font-weight: 700;
  color: #FFFFFF;
}

.hero h1 em {
  font-style: normal;
  color: var(--accent-bright);
}

.hero p {
  max-width: 560px;
  color: var(--dark-muted);
  font-size: 16.5px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.hero .hero-actions .btn {
  background: var(--dark-text);
  border-color: var(--dark-text);
  color: var(--ink);
}

.hero .hero-actions .btn:hover {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--accent-ink);
}

/* factory collage: drafting-grid 2x2 */

.hero-visual {
  position: relative;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5px;
  background: rgba(246, 246, 244, 0.4);
  border: 1.5px solid rgba(246, 246, 244, 0.4);
}

.hv-card {
  position: static;
  overflow: hidden;
  background: var(--card);
}

.hv-card img {
  width: 100%;
  height: 100%;
  aspect-ratio: 1;
  object-fit: cover;
}

.hv-badge {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  z-index: 2;
  padding: 9px 14px;
  background: var(--dark-text);
  border: 1.5px solid var(--rule);
  color: var(--ink);
  font-family: var(--mono);
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  white-space: nowrap;
}

/* stats band */

.stats-band {
  position: relative;
  background: var(--dark-2);
  border-top: 1px solid var(--line-dark);
  color: var(--dark-text);
}

.stats-inner {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 24px;
}

.stats-inner div {
  padding: 24px 22px;
  border-right: 1px solid var(--line-dark);
}

.stats-inner div:first-child {
  padding-left: 0;
}

.stats-inner div:last-child {
  border-right: 0;
}

.stats-inner strong {
  display: block;
  font-family: var(--mono);
  font-weight: 700;
  font-size: 27px;
  letter-spacing: -0.01em;
  color: #FFFFFF;
  font-variant-numeric: tabular-nums;
}

.stats-inner strong b {
  color: #FFFFFF;
}

.stats-inner span {
  color: var(--dark-muted);
  font-size: 13px;
}

/* ---------- sections ---------- */

.section {
  padding: 76px 24px;
}

.section.alt {
  background: var(--paper);
}

.container {
  max-width: 1240px;
  margin: 0 auto;
}

.section-head {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 28px;
  margin-bottom: 34px;
  padding-top: 22px;
  border-top: 1.5px solid var(--rule);
}

.section-head h2 {
  max-width: 640px;
  margin: 10px 0 0;
  font-size: clamp(24px, 2.9vw, 33px);
  line-height: 1.1;
}

.section-head p {
  max-width: 460px;
  margin: 0;
  color: var(--muted);
  font-size: 14.5px;
}

.contact-band .section-head,
.hero .section-head {
  border-top-color: var(--line-dark);
}

/* ---------- cards & grids ---------- */

.grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.card {
  border: 1.5px solid var(--rule);
  background: var(--ground);
}

.product-card {
  overflow: hidden;
}

/* category showcase cards (homepage) */

.cat-card {
  position: relative;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  border: 1.5px solid var(--rule);
  background: var(--ground);
  transition: background 0.13s;
}

.cat-card:hover {
  background: var(--paper);
}

.cat-visual {
  position: relative;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  background: var(--card);
  border-bottom: 1.5px solid var(--rule);
}

.cat-visual img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.35s ease;
}

.cat-card:hover .cat-visual img {
  transform: scale(1.04);
}

.cat-count {
  position: absolute;
  top: 0;
  left: 0;
  padding: 6px 11px;
  background: var(--ink);
  border-right: 1.5px solid var(--rule);
  border-bottom: 1.5px solid var(--rule);
  color: var(--ground);
  font-family: var(--mono);
  font-size: 10.5px;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.cat-body {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 18px 20px 20px;
}

.cat-body h3 {
  margin: 0;
  font-size: 17px;
}

.cat-card:hover .cat-body h3 {
  text-decoration: underline;
  text-underline-offset: 4px;
  text-decoration-thickness: 2px;
  text-decoration-color: var(--accent);
}

.cat-body p {
  margin: 0;
  color: var(--muted);
  font-size: 13.5px;
}

.cat-subs {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 6px;
}

.cat-subs span {
  padding: 4px 9px;
  border: 1px solid var(--hair);
  background: var(--paper);
  color: var(--ink-2);
  font-family: var(--mono);
  font-size: 10.5px;
  font-weight: 500;
  letter-spacing: 0.02em;
}

.cat-cta {
  margin-top: auto;
  padding-top: 12px;
  color: var(--ink);
  font-family: var(--mono);
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

/* meta list */

.meta-list {
  display: grid;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  color: var(--muted);
  font-size: 14px;
}

.meta-list strong {
  color: var(--ink);
}

/* customer case cards */

.case-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 22px;
  border: 1.5px solid var(--rule);
  background: var(--ground);
  overflow: hidden;
}

.case-img {
  margin: -22px -22px 6px;
  aspect-ratio: 16 / 7;
  overflow: hidden;
  border-bottom: 1.5px solid var(--rule);
  background: var(--card);
}

.case-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.case-card h3 {
  margin: 0;
  font-size: 16.5px;
}

.case-card p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
}

.case-tag {
  margin-top: auto;
  padding-top: 8px;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

/* application tiles (customers section) */

.apps-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
  margin-top: 16px;
}

.app-tile {
  position: relative;
  display: flex;
  flex-direction: column;
  margin: 0;
  border: 1.5px solid var(--rule);
  background: var(--ground);
  overflow: hidden;
  transition: background 0.13s;
}

.app-tile:hover {
  background: var(--paper);
}

.app-tile img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  border-bottom: 1.5px solid var(--rule);
  transition: transform 0.35s ease;
}

.app-tile:hover img {
  transform: scale(1.04);
}

.app-tile .app-cap {
  padding: 12px 14px 14px;
}

.app-tile b {
  display: block;
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.app-tile:hover .app-cap b {
  text-decoration: underline;
  text-underline-offset: 4px;
  text-decoration-thickness: 2px;
  text-decoration-color: var(--accent);
}

.app-tile .app-cap span {
  display: block;
  color: var(--muted);
  font-size: 12px;
  margin-top: 3px;
}

/* features / process */

.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: start;
}

.feature-list {
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.feature-list li {
  display: grid;
  grid-template-columns: 42px 1fr;
  gap: 16px;
  align-items: start;
  padding: 16px 18px;
  border: 1.5px solid var(--rule);
  background: var(--ground);
}

.feature-ico {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  background: var(--ink);
  color: var(--dark-text);
}

.feature-ico svg {
  width: 21px;
  height: 21px;
}

.feature-list strong {
  display: block;
  margin-bottom: 2px;
  font-size: 15px;
}

.feature-list span {
  color: var(--muted);
  font-size: 13.5px;
}

.process {
  display: grid;
  gap: 0;
  counter-reset: step;
}

.step {
  position: relative;
  display: grid;
  grid-template-columns: 42px 1fr;
  gap: 16px;
  padding: 17px 0;
}

.step::before {
  counter-increment: step;
  content: "0" counter(step);
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  background: var(--ink);
  color: var(--dark-text);
  font-family: var(--mono);
  font-weight: 600;
  font-size: 14px;
  letter-spacing: 0.04em;
}

.step:not(:last-child)::after {
  content: "";
  position: absolute;
  top: 59px;
  left: 20px;
  bottom: -2px;
  width: 1.5px;
  background: var(--hair);
}

.step b {
  display: none;
}

.step strong {
  display: block;
  font-family: var(--mono);
  font-size: 15px;
  font-weight: 600;
}

.step p {
  margin: 2px 0 0;
  color: var(--muted);
  font-size: 13.5px;
}

/* certification strip */

.cert-strip {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 34px;
  padding-top: 22px;
  border-top: 1.5px solid var(--rule);
}

.cert-strip .eyebrow {
  margin-right: 10px;
}

.cert-strip span:not(.eyebrow) {
  padding: 7px 13px;
  border: 1px solid var(--hair);
  background: var(--ground);
  color: var(--ink-2);
  font-family: var(--mono);
  font-size: 11.5px;
  font-weight: 500;
  letter-spacing: 0.05em;
}

/* article cards */

.article-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 10px;
}

.article-card {
  display: flex;
  flex-direction: column;
  min-height: 168px;
  padding: 18px;
  border: 1.5px solid var(--rule);
  background: var(--ground);
  transition: background 0.13s;
}

.article-card:hover {
  background: var(--paper);
}

.article-card small {
  color: var(--muted);
  font-family: var(--mono);
  font-weight: 500;
  font-size: 10.5px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
}

.article-card h3 {
  margin: 10px 0 0;
  font-size: 14.5px;
  line-height: 1.35;
}

.article-card:hover h3 {
  text-decoration: underline;
  text-underline-offset: 4px;
  text-decoration-thickness: 2px;
  text-decoration-color: var(--accent);
}

/* faq */

.faq {
  display: grid;
  gap: 9px;
  max-width: 860px;
}

.faq details {
  border: 1px solid var(--hair);
  background: var(--ground);
}

.faq details[open] {
  border: 1.5px solid var(--rule);
}

.faq summary {
  cursor: pointer;
  padding: 16px 20px;
  font-family: var(--mono);
  font-weight: 600;
  font-size: 14px;
  list-style: none;
}

.faq summary::-webkit-details-marker {
  display: none;
}

.faq summary::after {
  content: "+";
  float: right;
  color: var(--ink);
  font-family: var(--mono);
  font-size: 18px;
  font-weight: 600;
}

.faq details[open] summary::after {
  content: "–";
}

.faq p {
  margin: 0;
  padding: 0 20px 16px;
  color: var(--muted);
  font-size: 14.5px;
}

/* ---------- contact band (dark workshop panel) ---------- */

.contact-band {
  background:
    linear-gradient(rgba(246, 246, 244, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(246, 246, 244, 0.045) 1px, transparent 1px),
    var(--dark);
  background-size: 34px 34px, 34px 34px, auto;
  border-top: 1.5px solid var(--rule);
  color: #FFFFFF;
}

.contact-box {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 44px;
  align-items: start;
}

.contact-box h2 {
  margin: 14px 0 12px;
  font-size: clamp(26px, 3vw, 34px);
  line-height: 1.1;
  color: #FFFFFF;
}

.contact-box p {
  color: var(--dark-muted);
  font-size: 15px;
}

.rfq {
  display: grid;
  gap: 13px;
  padding: 26px;
  border: 1.5px solid rgba(246, 246, 244, 0.35);
  background: var(--ground);
  color: var(--ink);
}

.rfq label {
  display: grid;
  gap: 6px;
  color: var(--ink-2);
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.rfq .form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.rfq input,
.rfq textarea,
.rfq select {
  width: 100%;
  min-height: 44px;
  padding: 10px 13px;
  border: 1.5px solid var(--hair);
  background: var(--card);
  font-family: var(--font);
  font-size: 14.5px;
  letter-spacing: normal;
  text-transform: none;
  transition: border-color 0.13s;
}

.rfq input:focus,
.rfq textarea:focus,
.rfq select:focus {
  outline: none;
  border-color: var(--ink);
}

.rfq textarea {
  min-height: 104px;
}

.rfq [data-form-note] {
  margin: 0;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--accent);
}

/* ---------- footer ---------- */

.site-footer {
  background: var(--dark);
  border-top: 3px solid var(--accent);
  color: var(--dark-muted);
  font-size: 13.5px;
}

.footer-cols {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 36px;
  max-width: 1240px;
  margin: 0 auto;
  padding: 52px 24px 38px;
}

.footer-cols h4 {
  margin: 0 0 14px;
  color: var(--dark-text);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.footer-cols a {
  display: block;
  padding: 4px 0;
  color: var(--dark-muted);
}

.footer-cols a:hover {
  color: var(--dark-text);
  text-decoration: underline;
  text-underline-offset: 4px;
  text-decoration-color: var(--accent-bright);
}

.footer-brand p {
  max-width: 300px;
  margin: 12px 0 0;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  max-width: 1240px;
  margin: 0 auto;
  padding: 18px 24px;
  border-top: 1px solid var(--line-dark);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.04em;
}

.footer-inner a:hover {
  color: var(--dark-text);
  text-decoration: underline;
  text-underline-offset: 4px;
  text-decoration-color: var(--accent-bright);
}

/* ---------- page hero (inner pages) ---------- */

.page-hero {
  padding: 56px 24px 48px;
  color: var(--dark-text);
  background:
    linear-gradient(rgba(246, 246, 244, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(246, 246, 244, 0.045) 1px, transparent 1px),
    var(--dark);
  background-size: 34px 34px, 34px 34px, auto;
  border-bottom: 1.5px solid var(--rule);
}

.page-hero .container {
  max-width: 1240px;
}

.page-hero h1 {
  margin: 14px 0 10px;
  max-width: 900px;
  font-size: clamp(27px, 3.6vw, 40px);
  line-height: 1.1;
  font-weight: 700;
  color: #FFFFFF;
}

.page-hero p {
  max-width: 720px;
  margin: 0;
  color: var(--dark-muted);
  font-size: 15.5px;
}

.page-hero .btn {
  margin-top: 16px;
  background: var(--dark-text);
  border-color: var(--dark-text);
  color: var(--ink);
}

.page-hero .btn:hover {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--accent-ink);
}

/* ---------- content pages ---------- */

.content {
  max-width: 920px;
  margin: 0 auto;
}

.content h2 {
  margin-top: 38px;
  font-size: 22px;
}

.content p,
.content li {
  color: var(--ink-2);
}

.table-wrap {
  overflow-x: auto;
  border: 1.5px solid var(--rule);
}

table {
  width: 100%;
  border-collapse: collapse;
  background: var(--card);
  font-variant-numeric: tabular-nums;
}

th,
td {
  padding: 11px 14px;
  border-bottom: 1px solid var(--hair);
  text-align: left;
  vertical-align: top;
  font-size: 14px;
}

tr:last-child th,
tr:last-child td {
  border-bottom: 0;
}

th {
  background: var(--ink);
  color: var(--ground);
  font-family: var(--mono);
  font-weight: 600;
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

/* ============================================================
   catalog page — sidebar layout
   ============================================================ */

.catalog-layout {
  display: grid;
  grid-template-columns: 264px 1fr;
  gap: 32px;
  align-items: start;
}

.catalog-side {
  position: sticky;
  top: 88px;
  display: grid;
  gap: 18px;
}

.side-box {
  border: 1.5px solid var(--rule);
  background: var(--ground);
  padding: 16px;
}

.side-box h3 {
  margin: 0 0 12px;
  padding-bottom: 9px;
  border-bottom: 1.5px solid var(--rule);
  font-size: 11px;
  font-weight: 600;
  color: var(--ink);
  text-transform: uppercase;
  letter-spacing: 0.14em;
}

.cat-tree {
  display: grid;
  gap: 1px;
  max-height: 60vh;
  overflow: auto;
}

.cat-tree button {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  width: 100%;
  padding: 8px 10px;
  border: 0;
  background: transparent;
  color: var(--ink-2);
  font-size: 13.5px;
  font-weight: 500;
  text-align: left;
  cursor: pointer;
}

.cat-tree button:hover {
  background: var(--paper);
  color: var(--ink);
}

.cat-tree button.active {
  background: var(--ink);
  color: var(--ground);
  font-weight: 600;
}

.cat-tree button span {
  color: var(--muted);
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 500;
}

.cat-tree button.active span {
  color: rgba(246, 246, 244, 0.75);
}

.cat-tree .sub {
  padding-left: 24px;
  font-size: 13px;
  font-weight: 400;
}

.cat-tree .sub.active {
  font-weight: 600;
}

#catalog-search {
  width: 100%;
  min-height: 44px;
  padding: 10px 13px;
  border: 1.5px solid var(--hair);
  background: var(--card);
  font-family: var(--font);
  font-size: 13.5px;
  transition: border-color 0.13s;
}

#catalog-search:focus {
  outline: none;
  border-color: var(--ink);
}

.catalog-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 18px;
  padding-bottom: 13px;
  border-bottom: 1.5px solid var(--rule);
}

.catalog-count {
  margin: 0;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.03em;
  text-transform: uppercase;
}

.catalog-count b {
  color: var(--ink);
}

.sort-wrap {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.sort-wrap select {
  min-height: 38px;
  padding: 6px 10px;
  border: 1.5px solid var(--rule);
  background: var(--ground);
  font-family: var(--mono);
  font-size: 12px;
  cursor: pointer;
}

.crumbs-chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 12px;
  border: 1.5px solid var(--rule);
  border-left: 5px solid var(--rule);
  background: var(--paper);
  color: var(--ink);
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 500;
}

.crumbs-chip button {
  border: 0;
  background: none;
  color: inherit;
  font-weight: 700;
  cursor: pointer;
  padding: 0 2px;
}

/* catalog product cards */

.catalog-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.catalog-card {
  display: flex;
  flex-direction: column;
  overflow: hidden;
  border: 1.5px solid var(--rule);
  background: var(--ground);
  transition: background 0.13s;
}

.catalog-card:hover {
  background: var(--paper);
}

.catalog-visual {
  position: relative;
  aspect-ratio: 1 / 1;
  overflow: hidden;
  display: grid;
  place-items: center;
  background: var(--card);
  border-bottom: 1.5px solid var(--rule);
  color: var(--muted);
  font-family: var(--mono);
  font-size: 30px;
  font-weight: 700;
}

.catalog-visual img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  transition: transform 0.3s ease;
}

.catalog-card:hover .catalog-visual img {
  transform: scale(1.04);
}

.catalog-card .card-body {
  display: flex;
  flex-direction: column;
  gap: 7px;
  flex: 1;
  padding: 13px 15px 15px;
}

.catalog-card h3 {
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin: 0;
  font-family: var(--font);
  font-size: 13.5px;
  line-height: 1.42;
  font-weight: 500;
  letter-spacing: 0;
}

.catalog-card:hover h3 {
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-color: var(--accent);
}

.cat-tag {
  color: var(--muted);
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.price-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
  margin-top: auto;
  padding-top: 8px;
  font-variant-numeric: tabular-nums;
}

.price-row .price {
  color: var(--ink);
  font-family: var(--mono);
  font-size: 16px;
  font-weight: 700;
}

.price-row .moq {
  color: var(--muted);
  font-family: var(--mono);
  font-size: 11px;
}

.sold-tag {
  position: absolute;
  top: 0;
  right: 0;
  padding: 5px 9px;
  background: var(--ink);
  border-left: 1.5px solid var(--rule);
  border-bottom: 1.5px solid var(--rule);
  color: #FFFFFF;
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.catalog-more {
  margin-top: 28px;
  text-align: center;
}

/* full product index (SEO-crawlable, catalog.html bottom) */

.product-index details {
  border: 1px solid var(--hair);
  background: var(--ground);
  margin-bottom: 8px;
}

.product-index details[open] {
  border: 1.5px solid var(--rule);
}

.product-index summary {
  cursor: pointer;
  padding: 13px 18px;
  font-family: var(--mono);
  font-weight: 600;
  font-size: 13px;
  list-style: none;
}

.product-index summary::-webkit-details-marker {
  display: none;
}

.product-index summary::after {
  content: "+";
  float: right;
  font-family: var(--mono);
  font-size: 16px;
}

.product-index details[open] summary::after {
  content: "–";
}

.product-index ul {
  columns: 2;
  column-gap: 32px;
  margin: 0;
  padding: 0 18px 16px;
  list-style: none;
}

.product-index li {
  padding: 3px 0;
  font-size: 13px;
  break-inside: avoid;
}

.product-index li a {
  color: var(--ink-2);
}

.product-index li a:hover {
  color: var(--ink);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-color: var(--accent);
}

@media (max-width: 760px) {
  .product-index ul {
    columns: 1;
  }
}

/* ---------- product detail ---------- */

.crumbs {
  margin: 0 0 22px;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.02em;
}

.crumbs a:hover {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.pd-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 44px;
  align-items: start;
}

.pd-main-img {
  overflow: hidden;
  border: 1.5px solid var(--rule);
  background: var(--card);
}

.pd-main-img img {
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: contain;
}

.pd-thumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 10px;
}

.pd-thumb {
  width: 64px;
  height: 64px;
  padding: 0;
  border: 1.5px solid var(--hair);
  background: var(--card);
  cursor: pointer;
  overflow: hidden;
  transition: border-color 0.13s;
}

.pd-thumb img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.pd-thumb.active,
.pd-thumb:hover {
  border-color: var(--accent);
}

.pd-info h1 {
  margin: 8px 0 14px;
  font-size: 24px;
  line-height: 1.22;
}

.pd-price {
  margin: 0 0 16px;
  color: var(--ink);
  font-family: var(--mono);
  font-size: 26px;
  font-weight: 700;
  letter-spacing: -0.01em;
  font-variant-numeric: tabular-nums;
}

.pd-meta {
  margin-bottom: 18px;
}

.pd-apps {
  margin: 0 0 18px;
}

.pd-apps-label {
  display: block;
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 8px;
}

.pd-apps-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.pd-apps-chips span {
  padding: 5px 10px;
  border: 1px solid var(--hair);
  background: var(--paper);
  font-family: var(--mono);
  font-size: 11px;
  color: var(--ink-2);
}

.pd-tiers {
  margin-bottom: 22px;
}

.pd-note {
  margin-top: 18px;
  padding: 14px 16px;
  border: 1.5px solid var(--rule);
  border-left: 5px solid var(--rule);
  background: var(--paper);
  color: var(--ink-2);
  font-size: 13.5px;
}

.pd-specs,
.pd-related {
  margin-top: 52px;
}

.pd-specs h2,
.pd-related h2 {
  padding-top: 18px;
  border-top: 1.5px solid var(--rule);
  font-size: 21px;
}

.pd-specs th {
  width: 32%;
}

.pd-related .catalog-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

@media (max-width: 1120px) {
  .pd-related .catalog-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

/* ---------- responsive ---------- */

@media (max-width: 1120px) {
  .catalog-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .article-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

  .hero-inner {
    grid-template-columns: 1fr;
  }

  .hero-visual {
    display: none;
  }
}

@media (max-width: 900px) {
  .nav {
    flex-wrap: wrap;
    padding-top: 12px;
    padding-bottom: 12px;
  }

  .nav-links {
    flex-wrap: wrap;
  }

  .drop-panel {
    position: static;
    transform: none;
    display: none;
    grid-template-columns: 1fr;
  }

  .nav-drop:hover .drop-panel,
  .nav-drop:focus-within .drop-panel {
    display: grid;
  }

  .stats-inner {
    grid-template-columns: repeat(2, 1fr);
  }

  .stats-inner div {
    border-right: 0;
    border-bottom: 1px solid var(--line-dark);
    padding-left: 0;
  }

  .split,
  .contact-box,
  .pd-layout,
  .catalog-layout {
    grid-template-columns: 1fr;
  }

  .catalog-side {
    position: static;
  }

  .cat-tree {
    max-height: 300px;
  }

  .section-head {
    align-items: start;
    flex-direction: column;
    gap: 10px;
  }

  .article-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .footer-cols {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 600px) {
  .section {
    padding: 56px 18px;
  }

  .hero-inner {
    padding: 60px 18px 52px;
  }

  .grid,
  .catalog-grid,
  .article-grid,
  .apps-grid {
    grid-template-columns: 1fr;
  }

  .stats-inner {
    grid-template-columns: 1fr;
  }

  .footer-cols {
    grid-template-columns: 1fr;
  }
}