/* =========================================================
   SYNTROPUS / AETERNA TECHNOLOGY INC.
   Industrial-technical design system
   ========================================================= */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=JetBrains+Mono:wght@400;500&display=swap');

:root {
  --bg: #F4F5F7;             /* cool neutral light gray */
  --bg-alt: #EAECF0;
  --ink: #0A0B10;            /* rich near-black */
  --ink-2: #2A2C35;
  --ink-3: #70737D;
  --line: #DFE1E6;           /* neutral hairline */
  --line-strong: #B6B8C0;
  --accent: #173ACC;
  --accent-2: #408FF2;
  --accent-ink: #03114A;
  --mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, monospace;
  --sans: 'Inter', system-ui, -apple-system, Segoe UI, sans-serif;
  --maxw: 1280px;
  --gutter: clamp(20px, 4vw, 48px);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a { color: inherit; text-decoration: none; }
img, svg { display: block; max-width: 100%; }

/* ---------- Layout ---------- */
.wrap {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.rule {
  height: 1px;
  background: var(--line);
  border: 0;
  margin: 0;
}

.rule-strong { background: var(--line-strong); }

/* ---------- Mono labels ---------- */
.label {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-3);
}

.label-accent { color: var(--accent); }

.index {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--ink-3);
  letter-spacing: 0.1em;
}

/* ---------- Header / nav ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(244, 245, 247, 0.92);
  backdrop-filter: saturate(140%) blur(10px);
  border-bottom: 1px solid var(--line);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
}

.brand-logo {
  display: inline-block;
  width: 56px;
  height: 56px;
  flex: 0 0 56px;
  background: transparent;
  object-fit: contain;
}

.site-header .nav { height: 84px; }

.brand-text {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  line-height: 1;
}

.brand-name {
  font-family: var(--mono);
  font-weight: 600;
  font-size: 14px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  line-height: 1;
  color: var(--ink);
  white-space: nowrap;
}

.brand-tm {
  font-size: 0.55em;
  margin-left: 2px;
  vertical-align: 0.48em;
  color: var(--ink-3);
  font-weight: 400;
  letter-spacing: 0;
}

.brand-parent {
  font-family: var(--sans);
  font-style: normal;
  font-weight: 400;
  color: var(--ink-3);
  font-size: 11.5px;
  letter-spacing: 0.02em;
  line-height: 1;
  text-transform: none;
  white-space: nowrap;
}

.nav-links {
  display: flex;
  gap: clamp(20px, 3vw, 40px);
  font-family: var(--sans);
  font-size: 15px;
  font-weight: 500;
  letter-spacing: -0.005em;
  text-transform: none;
}

.nav-links a {
  position: relative;
  padding: 6px 0;
  color: var(--ink-2);
  transition: color .2s ease;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--ink);
}

.nav-links a.active::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  background: var(--accent);
}

.nav-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  border: 1px solid var(--ink);
  font-family: var(--sans);
  font-size: 14px;
  font-weight: 500;
  letter-spacing: -0.005em;
  text-transform: none;
  color: var(--ink);
  background: transparent;
  transition: background .15s ease, color .15s ease;
}

.nav-cta:hover { background: var(--ink); color: var(--bg); }

/* ---------- Section scaffolding ---------- */
section {
  padding: clamp(72px, 10vw, 144px) 0;
  border-bottom: 1px solid var(--line);
}

.section-head {
  display: grid;
  grid-template-columns: 1fr 3fr;
  gap: clamp(24px, 4vw, 64px);
  align-items: baseline;
  margin-bottom: clamp(28px, 4vw, 48px);
}

.section-head h2 {
  margin: 0;
  font-family: var(--sans);
  font-size: clamp(30px, 3.4vw, 48px);
  line-height: 1.05;
  font-weight: 600;
  letter-spacing: -0.028em;
  max-width: 22ch;
}

.section-head .label { padding-top: 8px; }

@media (max-width: 720px) {
  .section-head { grid-template-columns: 1fr; }
}

/* ---------- Hero ---------- */
.hero {
  padding: clamp(80px, 12vw, 180px) 0 clamp(64px, 9vw, 128px);
  border-bottom: 1px solid var(--line);
  position: relative;
  overflow: hidden;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 48px);
}

.hero-kicker {
  display: flex;
  gap: 20px;
  align-items: center;
  color: var(--ink-3);
}

.hero h1 {
  margin: 0;
  font-family: var(--sans);
  font-size: clamp(48px, 7.4vw, 112px);
  line-height: 0.98;
  letter-spacing: -0.035em;
  font-weight: 600;
}


.hero h1 .accent { color: var(--accent); }

.hero-sub {
  max-width: 58ch;
  font-size: clamp(17px, 1.4vw, 20px);
  line-height: 1.55;
  color: var(--ink-2);
  font-weight: 400;
}

.hero-meta {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  padding-top: clamp(32px, 5vw, 64px);
  border-top: 1px solid var(--line);
  margin-top: clamp(24px, 4vw, 40px);
}

.hero-meta .cell .label { display: block; margin-bottom: 6px; }
.hero-meta .cell .val {
  font-family: var(--mono);
  font-size: 14px;
  color: var(--ink);
}

@media (max-width: 720px) {
  .hero-meta { grid-template-columns: repeat(2, 1fr); }
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 22px;
  font-family: var(--sans);
  font-size: 15px;
  font-weight: 500;
  letter-spacing: -0.005em;
  text-transform: none;
  border: 1px solid var(--ink);
  color: var(--ink);
  background: transparent;
  cursor: pointer;
  transition: background .15s ease, color .15s ease, transform .15s ease;
}

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

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

.btn .arrow {
  display: inline-block;
  transform: translateX(0);
  transition: transform .15s ease;
}
.btn:hover .arrow { transform: translateX(4px); }

.btn-row { display: flex; flex-wrap: wrap; gap: 12px; }

/* ---------- Capability / product grid ---------- */
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: clamp(1px, 0.2vw, 2px); background: var(--line); border: 1px solid var(--line); }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); }

@media (max-width: 900px) {
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 640px) {
  .grid-2, .grid-3 { grid-template-columns: 1fr; }
}

.cell-card {
  background: var(--bg);
  padding: clamp(24px, 3vw, 40px);
  display: flex;
  flex-direction: column;
  gap: 12px;
  min-height: 260px;
}

.cell-card h3 {
  margin: 8px 0 4px;
  font-size: clamp(20px, 1.8vw, 26px);
  letter-spacing: -0.01em;
  font-weight: 600;
}

.cell-card p {
  margin: 0;
  color: var(--ink-2);
  font-size: 15px;
}

.cell-card .index { margin-bottom: 6px; }

/* ---------- Spec table ---------- */
.spec {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--mono);
  font-size: 13px;
}

.spec tr { border-bottom: 1px solid var(--line); }
.spec tr:last-child { border-bottom: 0; }
.spec th, .spec td {
  padding: 14px 0;
  text-align: left;
  vertical-align: top;
}
.spec th {
  width: 40%;
  font-weight: 500;
  color: var(--ink-3);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  font-size: 11px;
}
.spec td { color: var(--ink); }

/* ---------- Stats strip ---------- */
.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.stats .stat {
  padding: clamp(28px, 3vw, 44px) clamp(16px, 2vw, 24px);
  border-right: 1px solid var(--line);
}
.stats .stat:last-child { border-right: 0; }

.stats .num {
  font-size: clamp(32px, 4vw, 56px);
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1;
}

.stats .num .unit {
  font-family: var(--mono);
  font-size: 0.45em;
  margin-left: 4px;
  color: var(--accent);
  letter-spacing: 0.04em;
}

.stats .lbl {
  margin-top: 10px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-3);
}

@media (max-width: 800px) {
  .stats { grid-template-columns: repeat(2, 1fr); }
  .stats .stat:nth-child(2) { border-right: 0; }
  .stats .stat:nth-child(1), .stats .stat:nth-child(2) { border-bottom: 1px solid var(--line); }
}

/* ---------- Two-col content blocks ---------- */
.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(32px, 5vw, 80px);
  align-items: start;
}

.two-col p {
  color: var(--ink-2);
  font-size: 16px;
  max-width: 58ch;
}

.two-col p + p { margin-top: 1em; }

@media (max-width: 800px) {
  .two-col { grid-template-columns: 1fr; }
}

/* ---------- Timeline ---------- */
.timeline {
  display: grid;
  grid-template-columns: 160px 1fr;
  gap: 32px;
}

.timeline + .timeline { margin-top: 0; }

.timeline-list { margin-top: 24px; }
.timeline-list .row {
  display: grid;
  grid-template-columns: 160px 1fr;
  gap: 32px;
  padding: 20px 0;
  border-top: 1px solid var(--line);
}
.timeline-list .row:last-child { border-bottom: 1px solid var(--line); }
.timeline-list .year {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--accent);
  letter-spacing: 0.08em;
}
.timeline-list .body h4 { margin: 0 0 6px; font-size: 17px; }
.timeline-list .body p { margin: 0; color: var(--ink-2); }

@media (max-width: 640px) {
  .timeline-list .row { grid-template-columns: 1fr; gap: 6px; }
}

/* ---------- Contact ---------- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: clamp(32px, 5vw, 80px);
}

@media (max-width: 820px) {
  .contact-grid { grid-template-columns: 1fr; }
}

.contact-block h3 {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin: 24px 0 6px;
  font-weight: 500;
}

.contact-block .big {
  font-size: clamp(18px, 1.6vw, 22px);
  font-family: var(--mono);
  color: var(--ink);
  letter-spacing: -0.01em;
}

form.contact-form {
  display: grid;
  gap: 18px;
  border: 1px solid var(--line);
  padding: clamp(24px, 3vw, 40px);
  background: var(--bg-alt);
}

form.contact-form .row { display: grid; gap: 18px; grid-template-columns: 1fr 1fr; }
@media (max-width: 540px) { form.contact-form .row { grid-template-columns: 1fr; } }

form.contact-form label {
  display: block;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin-bottom: 6px;
}

form.contact-form input,
form.contact-form select,
form.contact-form textarea {
  width: 100%;
  border: 0;
  border-bottom: 1px solid var(--line-strong);
  background: transparent;
  padding: 10px 0;
  font-family: var(--sans);
  font-size: 15px;
  color: var(--ink);
  outline: none;
  transition: border-color .15s ease;
}

form.contact-form input:focus,
form.contact-form select:focus,
form.contact-form textarea:focus {
  border-color: var(--accent);
}

form.contact-form textarea { resize: vertical; min-height: 120px; }

form.contact-form .submit-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-top: 8px;
}

form.contact-form .fineprint {
  font-family: var(--mono);
  font-size: 10.5px;
  color: var(--ink-3);
  letter-spacing: 0.06em;
}

/* ---------- Footer ---------- */
.site-footer {
  background: #060A18;
  color: #C5CAD9;
  padding: clamp(48px, 6vw, 80px) 0 32px;
  font-size: 14px;
}

.site-footer a { color: #E6E9F2; }
.site-footer a:hover { color: var(--accent-2); }

.foot-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: clamp(24px, 4vw, 48px);
  margin-bottom: 48px;
}

.foot-brand .brand-name { color: #fff; }
.foot-brand .brand-logo { filter: brightness(1.45) saturate(1.1); }
.foot-brand p { color: #9FA5B8; max-width: 44ch; margin: 16px 0 0; font-size: 13.5px; }

.foot-col h5 {
  margin: 0 0 14px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: #8890A5;
  font-weight: 500;
}
.foot-col ul { list-style: none; padding: 0; margin: 0; display: grid; gap: 8px; }

.foot-bottom {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 16px;
  padding-top: 24px;
  border-top: 1px solid #1C2238;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: #8890A5;
  text-transform: uppercase;
}

@media (max-width: 720px) {
  .foot-grid { grid-template-columns: 1fr 1fr; }
  .foot-brand { grid-column: 1 / -1; }
}

/* ---------- Misc ---------- */
.pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 10px;
  border: 1px solid var(--line-strong);
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-2);
  background: var(--bg-alt);
}

.pill-dot {
  width: 6px; height: 6px; background: var(--accent); border-radius: 50%;
  box-shadow: 0 0 0 3px rgba(23, 58, 204, 0.18);
}

.callout {
  padding: clamp(28px, 3vw, 40px);
  border: 1px solid var(--line);
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 32px;
  align-items: center;
  background: var(--bg-alt);
}
.callout h3 { margin: 0 0 10px; font-family: var(--sans); font-size: clamp(22px, 2vw, 28px); letter-spacing: -0.022em; font-weight: 600; line-height: 1.2; }
.callout p { margin: 0; color: var(--ink-2); }

@media (max-width: 720px) {
  .callout { grid-template-columns: 1fr; }
}

/* ---------- Inline feature badge (CERTIFIED · OCP etc.) ---------- */
.feature-badge {
  display: inline-flex;
  align-items: center;
  padding: 4px 10px;
  margin-left: 12px;
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  background: rgba(23, 58, 204, 0.10);
  border-radius: 999px;
  vertical-align: middle;
  font-weight: 500;
}

/* ---------- Spec pills (3KW · 2OU · ±400V etc.) ---------- */
.spec-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
}

.spec-pill {
  display: inline-flex;
  align-items: center;
  padding: 9px 18px;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--ink-2);
  background: transparent;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  letter-spacing: 0.02em;
  white-space: nowrap;
  transition: border-color .2s ease, color .2s ease, background .2s ease;
}

.spec-pill:hover {
  border-color: var(--ink);
  color: var(--ink);
}

/* ---------- Feature grid (2x2 layout, minimal, numbered) ---------- */
.features {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.features .feature {
  padding: clamp(36px, 4vw, 56px) clamp(28px, 3vw, 48px);
  display: flex;
  flex-direction: column;
  gap: 14px;
  position: relative;
  min-height: 260px;
}

.features .feature:nth-child(odd) {
  border-right: 1px solid var(--line);
}

.features .feature:nth-child(n+3) {
  border-top: 1px solid var(--line);
}

.features .feature-num {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--accent);
  text-transform: uppercase;
  margin-bottom: 6px;
}

.features .feature h3 {
  margin: 0 0 4px;
  font-family: var(--sans);
  font-size: clamp(22px, 2vw, 28px);
  letter-spacing: -0.02em;
  font-weight: 600;
  line-height: 1.2;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0;
}

.features .feature .feature-rule {
  width: 40px;
  height: 1px;
  background: var(--line-strong);
  margin: 6px 0 12px;
  border: 0;
}

.features .feature p {
  margin: 0;
  color: var(--ink-2);
  font-size: 15.5px;
  line-height: 1.65;
  max-width: 44ch;
  font-weight: 400;
}

@media (max-width: 720px) {
  .features { grid-template-columns: 1fr; }
  .features .feature:nth-child(odd) { border-right: 0; }
  .features .feature:not(:first-child) { border-top: 1px solid var(--line); }
}

/* ---------- Products preview (Home page) ---------- */
.products-preview {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.products-preview .product-card {
  padding: clamp(32px, 4vw, 48px);
  display: flex;
  flex-direction: column;
  gap: 16px;
  text-decoration: none;
  color: inherit;
  transition: background .2s ease;
}

.products-preview .product-card:nth-child(odd) {
  border-right: 1px solid var(--line);
}

.products-preview .product-card:hover {
  background: var(--bg-alt);
}

.products-preview .thumb {
  border: 1px solid var(--line);
  padding: 24px;
  margin-bottom: 12px;
  background: var(--bg);
}

.products-preview .thumb svg {
  width: 100%;
  height: auto;
  display: block;
}

.products-preview .label-num {
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  color: var(--accent);
  text-transform: uppercase;
}

.products-preview .product-card h3 {
  margin: 0;
  font-family: var(--sans);
  font-size: clamp(24px, 2.2vw, 30px);
  line-height: 1.1;
  letter-spacing: -0.022em;
  font-weight: 600;
}

.products-preview .rule {
  width: 36px;
  height: 1px;
  background: var(--line-strong);
  border: 0;
  margin: 0;
}

.products-preview .product-card p {
  margin: 0;
  color: var(--ink-2);
  font-size: 15px;
  line-height: 1.6;
  max-width: 44ch;
  flex-grow: 1;
}

.products-preview .link {
  font-family: var(--sans);
  font-size: 14.5px;
  font-weight: 500;
  color: var(--accent);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 6px;
}

.products-preview .product-card:hover .link {
  gap: 12px;
  transition: gap .15s ease;
}

@media (max-width: 780px) {
  .products-preview { grid-template-columns: 1fr; }
  .products-preview .product-card:nth-child(odd) { border-right: 0; }
  .products-preview .product-card:not(:first-child) { border-top: 1px solid var(--line); }
}

/* ---------- Product showcase (Products page) ---------- */
.product-section {
  padding: clamp(72px, 10vw, 128px) 0;
  border-bottom: 1px solid var(--line);
  position: relative;
  overflow: hidden;
}

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

.product-bg-num {
  position: absolute;
  top: -24px;
  right: clamp(-48px, -4vw, -16px);
  font-family: var(--mono);
  font-size: clamp(180px, 24vw, 340px);
  font-weight: 300;
  color: var(--line);
  line-height: 0.9;
  user-select: none;
  pointer-events: none;
  z-index: 0;
  letter-spacing: -0.05em;
  opacity: 0.7;
}

.product-section.alt .product-bg-num {
  left: clamp(-48px, -4vw, -16px);
  right: auto;
  color: #D1D6E0;
}

.product-inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr 1.05fr;
  gap: clamp(40px, 6vw, 96px);
  align-items: center;
}

.product-section.alt .product-content { order: 2; }
.product-section.alt .product-visual  { order: 1; }

.product-label {
  display: inline-block;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--accent);
  text-transform: uppercase;
  margin-bottom: 20px;
}

.product-title {
  font-family: var(--sans);
  font-size: clamp(38px, 4.6vw, 60px);
  line-height: 1.02;
  letter-spacing: -0.032em;
  font-weight: 600;
  margin: 0 0 24px;
}

.product-rule {
  width: 48px;
  height: 1px;
  background: var(--line-strong);
  margin: 0 0 32px;
  border: 0;
}

.product-desc {
  color: var(--ink-2);
  font-size: 16.5px;
  line-height: 1.65;
  max-width: 52ch;
  margin: 0 0 32px;
  font-weight: 400;
}

.product-visual {
  border: 1px solid var(--line);
  padding: clamp(36px, 4vw, 64px);
  background: var(--bg);
}

.product-section.alt .product-visual {
  background: var(--bg);
}

.product-visual svg {
  width: 100%;
  height: auto;
  display: block;
}

@media (max-width: 860px) {
  .product-inner { grid-template-columns: 1fr; }
  .product-section.alt .product-content,
  .product-section.alt .product-visual { order: initial; }
  .product-bg-num { font-size: clamp(120px, 30vw, 200px); }
}

/* ---------- Schematic / decorative hero graphic ---------- */
.schematic {
  margin-top: clamp(40px, 5vw, 72px);
  border: 1px solid var(--line);
  padding: clamp(32px, 4vw, 56px);
  background: var(--bg);
}

.schematic svg { width: 100%; height: auto; }