/* ==========================================================================
   AKKA — design tokens
   Signature: a brushed-metal "ingot bar" gradient (navy → platinum) reused
   as hero panel, section dividers and image frames. Blueprint/spec-sheet
   layout language: hairline rules, mono data rows, no rounded card shadows.
   ========================================================================== */

:root {
  --navy-900: #0a1a30;
  --navy-800: #0f2545;
  --navy-700: #16335f;
  --platinum-200: #eef0f2;
  --platinum-300: #d7dbe0;
  --platinum-400: #b9c0c9;
  --platinum-600: #7c8794;
  --paper: #f6f6f4;
  --ink: #10141c;
  --ink-soft: #4b5563;
  --line: rgba(10, 26, 48, 0.14);
  --line-strong: rgba(10, 26, 48, 0.28);
  --azure: #2ca0de;

  --ingot: linear-gradient(115deg, var(--navy-900) 0%, var(--navy-700) 38%, var(--platinum-400) 62%, var(--platinum-200) 78%, var(--navy-800) 100%);
  --ingot-soft: linear-gradient(115deg, var(--navy-800) 0%, var(--navy-700) 45%, var(--platinum-300) 100%);

  --font-display: "Big Shoulders Display", "Arial Narrow", sans-serif;
  --font-body: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, "SFMono-Regular", monospace;

  --container: 1180px;
  --gap: clamp(1.25rem, 2vw, 2rem);
}

@media (prefers-color-scheme: dark) {
  :root {
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

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

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

.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 clamp(1.25rem, 4vw, 2.5rem);
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: 0.01em;
  text-transform: uppercase;
  color: var(--navy-900);
  margin: 0 0 0.5em;
  line-height: 1.02;
}

h1 { font-size: clamp(2.6rem, 6vw, 5.2rem); letter-spacing: 0.005em; }
h2 { font-size: clamp(1.9rem, 3.4vw, 3rem); }
h3 { font-size: clamp(1.2rem, 1.6vw, 1.5rem); }

p { margin: 0 0 1em; color: var(--ink-soft); }

.mono { font-family: var(--font-mono); font-variant-numeric: tabular-nums; }

/* focus visibility */
a:focus-visible, button:focus-visible, input:focus-visible {
  outline: 2px solid var(--navy-700);
  outline-offset: 3px;
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.001ms !important; transition-duration: 0.001ms !important; }
}

/* ---------- header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(246, 246, 244, 0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}

.site-header .bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.05rem clamp(1.25rem, 4vw, 2.5rem);
  max-width: var(--container);
  margin: 0 auto;
}

.wordmark {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.5rem;
  letter-spacing: 0.06em;
  color: var(--navy-900);
  display: flex;
  align-items: center;
  gap: 0.55rem;
}
.wordmark .logo-text { display: flex; align-items: baseline; gap: 0.35rem; }
.wordmark small {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  letter-spacing: 0.16em;
  color: var(--platinum-600);
  text-transform: uppercase;
  font-weight: 500;
}
.logo-mark {
  height: 34px;
  width: auto;
  flex-shrink: 0;
  transition: transform 0.35s cubic-bezier(0.16, 1, 0.3, 1);
}
a.wordmark:hover .logo-mark, button.wordmark:hover .logo-mark { transform: rotate(-6deg) scale(1.05); }

.nav-links {
  display: flex;
  align-items: center;
  gap: clamp(1rem, 2vw, 2.1rem);
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 0.92rem;
  font-weight: 600;
}
@media (min-width: 1081px) {
  .nav-links li { display: flex; align-items: center; }
}
.nav-links a {
  display: inline-flex;
  align-items: center;
  line-height: 1.3rem;
  color: var(--navy-800);
  padding: 0.3rem 0;
  border-bottom: 2px solid transparent;
  transition: border-color 0.2s ease, color 0.2s ease;
}
.nav-links a:hover,
.nav-links a[aria-current="page"] {
  border-bottom-color: var(--azure);
}

.nav-links li.has-dropdown { position: relative; }
.nav-dropdown-label {
  display: flex;
  align-items: center;
  line-height: 1.3rem;
  gap: 0.35em;
  color: var(--navy-800);
  padding: 0.3rem 0;
  border-bottom: 2px solid transparent;
  cursor: default;
}
.nav-dropdown-label svg { width: 9px; height: 9px; flex-shrink: 0; }
.nav-dropdown {
  list-style: none;
  margin: 0;
  padding: 0.5rem 0;
  position: absolute;
  top: 100%;
  left: -1rem;
  min-width: 240px;
  background: var(--paper);
  border: 1px solid var(--line-strong);
  box-shadow: 0 16px 32px -20px rgba(10, 26, 48, 0.4);
  display: none;
  flex-direction: column;
  z-index: 60;
}
.nav-links li.has-dropdown:hover .nav-dropdown,
.nav-links li.has-dropdown:focus-within .nav-dropdown {
  display: flex;
}
.nav-dropdown a {
  padding: 0.65rem 1.1rem;
  font-size: 0.86rem;
  font-weight: 600;
  border-bottom: none;
  display: block;
}
.nav-dropdown a:hover,
.nav-dropdown a[aria-current="page"] {
  background: var(--platinum-200);
  color: var(--navy-900);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.lang-switch {
  display: flex;
  gap: 0.35rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
}
.lang-switch button {
  background: none;
  border: 1px solid var(--line-strong);
  color: var(--ink-soft);
  padding: 0.28rem 0.55rem;
  cursor: pointer;
  text-transform: uppercase;
}
.lang-switch button[aria-pressed="true"] {
  background: var(--navy-900);
  color: var(--platinum-200);
  border-color: var(--navy-900);
}

.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--line-strong);
  padding: 0.5rem 0.6rem;
  cursor: pointer;
}
.nav-toggle span, .nav-toggle span::before, .nav-toggle span::after {
  content: "";
  display: block;
  width: 18px;
  height: 2px;
  background: var(--navy-900);
  position: relative;
}
.nav-toggle span::before { transform: translateY(-5px); }
.nav-toggle span::after { transform: translateY(3px); }

/* ---------- buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 0.85rem 1.4rem;
  border: 1px solid var(--navy-900);
  background: var(--navy-900);
  color: var(--platinum-200);
  cursor: pointer;
  transition: background 0.2s ease, color 0.2s ease, transform 0.15s ease;
}
.btn:hover { background: var(--navy-700); transform: translateY(-1px); }
.btn.ghost {
  background: transparent;
  color: var(--navy-900);
}
.btn.ghost:hover { background: var(--navy-900); color: var(--platinum-200); }
.btn.on-dark { border-color: var(--platinum-300); background: transparent; color: var(--platinum-200); }
.btn.on-dark:hover { background: var(--platinum-200); color: var(--navy-900); }

/* ---------- hero (ingot signature) ---------- */
.hero {
  position: relative;
  background: linear-gradient(90deg, rgba(3,10,22,0.74) 0%, rgba(3,10,22,0.62) 45%, rgba(3,10,22,0.5) 75%, rgba(3,10,22,0.4) 100%), var(--ingot);
  color: var(--platinum-200);
  overflow: hidden;
}
.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(100deg, rgba(255,255,255,0.05) 0 1px, transparent 1px 90px);
  pointer-events: none;
}
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(75deg, transparent 40%, rgba(255,255,255,0.1) 48%, rgba(255,255,255,0.18) 50%, rgba(255,255,255,0.1) 52%, transparent 60%);
  background-size: 260% 260%;
  background-position: -40% 0%;
  animation: ingot-sheen 9s ease-in-out infinite;
  pointer-events: none;
}
@keyframes ingot-sheen {
  0%, 100% { background-position: -60% 0%; }
  50% { background-position: 60% 0%; }
}
.hero-inner {
  position: relative;
  padding: clamp(4.5rem, 10vw, 8.5rem) clamp(1.25rem, 4vw, 2.5rem) clamp(3.5rem, 7vw, 5.5rem);
  max-width: var(--container);
  margin: 0 auto;
}
.hero h1 { color: #fff; max-width: 14ch; text-wrap: balance; }
.hero .lede {
  color: var(--platinum-300);
  max-width: 46ch;
  font-size: 1.08rem;
}
.hero-actions { display: flex; gap: 1rem; margin-top: 2rem; flex-wrap: wrap; }

.hero-specs {
  margin-top: 3.5rem;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-top: 1px solid rgba(255,255,255,0.22);
  padding-top: 1.5rem;
  gap: 1.5rem;
}
.hero-specs div { font-family: var(--font-mono); }
.hero-specs .num { font-size: clamp(1.4rem, 2.4vw, 2rem); color: #fff; display:block; font-weight:600; }
.hero-specs .label { font-size: 0.72rem; letter-spacing: 0.06em; text-transform: uppercase; color: var(--platinum-400); }

/* ---------- sections ---------- */
section { padding: clamp(3.5rem, 7vw, 6rem) 0; }
.section-alt { background: var(--platinum-200); }
.section-head { max-width: 62ch; margin-bottom: 2.75rem; }

.divider {
  height: 3px;
  background: var(--ingot-soft);
  border: none;
  margin: 0;
}

/* ---------- pillar / route cards (home) ---------- */
.pillars { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1px; background: var(--line-strong); border: 1px solid var(--line-strong); }
.pillar {
  background: var(--paper);
  padding: clamp(2rem, 4vw, 3rem);
  display: flex;
  flex-direction: column;
  min-height: 320px;
  transition: background 0.3s ease;
}
.pillar:hover { background: var(--platinum-200); }
.pillar .tag { font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--platinum-600); margin-bottom: 1rem; }
.pillar h3 { font-size: clamp(1.6rem, 2.4vw, 2.1rem); }
.pillar p { flex: 1; }
.pillar .btn { align-self: flex-start; margin-top: 1rem; }

/* trust strip */
.trust-strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.trust-item {
  padding: 1.75rem clamp(1rem, 2vw, 1.75rem);
  border-left: 1px solid var(--line);
}
.trust-item:first-child { border-left: none; }
.trust-item .num { font-family: var(--font-mono); font-size: 1.6rem; color: var(--navy-900); display: block; }
.trust-item .label { font-size: 0.85rem; color: var(--ink-soft); }

/* ---------- product spec cards ---------- */
.product-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--gap);
}
.product-card {
  border: 1px solid var(--line-strong);
  background: var(--paper);
  display: flex;
  flex-direction: column;
  transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1), border-color 0.3s ease;
}
.product-card:hover { transform: translateY(-4px); border-color: var(--navy-800); }
.product-media {
  aspect-ratio: 4/3;
  background: var(--platinum-200);
  position: relative;
  overflow: hidden;
  padding: 1.1rem;
}
.product-media img { width: 100%; height: 100%; object-fit: contain; }
.product-media.no-photo { background: var(--ingot-soft); padding: 0; }
.product-media .frame-label {
  position: absolute;
  bottom: 0.75rem;
  left: 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  color: var(--navy-700);
  text-transform: uppercase;
}
.product-media.no-photo .frame-label { color: #fff; }
.product-body { padding: 1.5rem; display: flex; flex-direction: column; gap: 1rem; flex: 1; }
.product-body h3 { margin-bottom: 0.1em; }
.spec-list { list-style: none; margin: 0; padding: 0; font-family: var(--font-mono); font-size: 0.83rem; border-top: 1px solid var(--line); }
.spec-list li {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.55rem 0;
  border-bottom: 1px solid var(--line);
  color: var(--ink-soft);
}
.spec-list li span:first-child { color: var(--navy-700); text-transform: uppercase; letter-spacing: 0.04em; font-size: 0.72rem; }
.spec-list li span:last-child { color: var(--ink); text-align: right; }
.product-body .btn { margin-top: auto; align-self: flex-start; }

/* ---------- castrol family cards ---------- */
.family-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: var(--gap);
}
.family-card {
  padding: 1.6rem;
  border: 1px solid var(--line);
  border-top: 3px solid var(--navy-800);
  background: var(--paper);
  transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.3s ease;
}
.family-card:hover { transform: translateY(-3px); box-shadow: 0 12px 24px -16px rgba(10, 26, 48, 0.35); }
.family-card h3 { font-size: 1.15rem; margin-bottom: 0.4em; }
.family-card .use { font-family: var(--font-mono); font-size: 0.72rem; color: var(--platinum-600); text-transform: uppercase; letter-spacing: 0.05em; margin-bottom: 0.75em; display:block; }

/* ---------- certifications ---------- */
.cert-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--gap);
  align-items: start;
}
.cert-badge {
  border: 1px solid var(--line-strong);
  padding: 2rem;
  background: var(--paper);
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.cert-badge .code { font-family: var(--font-mono); font-size: 0.75rem; color: var(--platinum-600); text-transform: uppercase; letter-spacing: 0.08em; }

/* ---------- contact ---------- */
.contact-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: clamp(2rem, 4vw, 4rem);
  align-items: start;
}
.contact-card {
  border: 1px solid var(--line-strong);
  padding: clamp(1.5rem, 3vw, 2.5rem);
  background: var(--paper);
}
.contact-methods { list-style: none; margin: 1.5rem 0 0; padding: 0; display: flex; flex-direction: column; gap: 1rem; }
.contact-methods a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border: 1px solid var(--line);
  padding: 1rem 1.25rem;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  transition: border-color 0.2s ease, background 0.2s ease;
}
.contact-methods a:hover { border-color: var(--navy-900); background: var(--platinum-200); }
.contact-methods .arrow { color: var(--platinum-600); }

/* ---------- footer ---------- */
.site-footer {
  background: var(--navy-900);
  color: var(--platinum-300);
  padding: 3rem 0 2rem;
  margin-top: 4rem;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 2rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid rgba(255,255,255,0.14);
}
.site-footer h4 { color: var(--platinum-200); font-size: 0.85rem; letter-spacing: 0.08em; margin-bottom: 1rem; }
.site-footer .wordmark { color: #fff; }
.site-footer .wordmark small { color: var(--platinum-400); }
.footer-links { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 0.6rem; font-size: 0.9rem; }
.footer-links a:hover { color: #fff; }
.footer-bottom {
  display: flex;
  justify-content: space-between;
  padding-top: 1.5rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--platinum-600);
  flex-wrap: wrap;
  gap: 0.5rem;
}

/* ---------- reveal on scroll ---------- */
[data-reveal] { opacity: 0; transform: translateY(16px); transition: opacity 0.6s ease, transform 0.6s ease; }
[data-reveal].is-visible { opacity: 1; transform: none; }

/* ---------- page hero (inner pages, smaller) ---------- */
.page-hero {
  position: relative;
  background: linear-gradient(90deg, rgba(3,10,22,0.74) 0%, rgba(3,10,22,0.62) 45%, rgba(3,10,22,0.5) 75%, rgba(3,10,22,0.4) 100%), var(--ingot);
  color: #fff;
  padding: clamp(3rem, 6vw, 4.5rem) 0 clamp(2.25rem, 4vw, 3rem);
  overflow: hidden;
}
.page-hero h1 { color: #fff; max-width: min(620px, 75%); text-wrap: balance; }
.page-hero p { color: var(--platinum-300); max-width: 56ch; }

/* ---------- about page ---------- */
.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: var(--gap); align-items: start; }
.value-list { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(2, 1fr); gap: 1px; background: var(--line); border-top: 1px solid var(--line); }
.value-list li { padding: 1.5rem 1.75rem 1.5rem 0; background: var(--paper); }
.value-list li:nth-child(odd) { padding-left: 0; }
.value-list li:nth-child(even) { padding-left: 1.75rem; }
.value-list li:last-child:nth-child(odd) { grid-column: 1 / -1; padding-left: 0; }

/* ---------- bullet list (activity/service areas) ---------- */
.bullet-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 0.9rem 2rem;
}
.bullet-grid li {
  position: relative;
  padding-left: 1.4rem;
  color: var(--ink);
  font-weight: 500;
}
.bullet-grid li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 8px;
  height: 8px;
  background: var(--ingot-soft);
}

/* ---------- process flow (lojistik) ---------- */
.process-flow {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--navy-900);
  border: 1px solid var(--line-strong);
  padding: 1.25rem 1.5rem;
  background: var(--paper);
}
.process-flow .step { padding: 0.4rem 0.8rem; border: 1px solid var(--line); }
.process-flow .arrow { color: var(--platinum-600); }

/* ---------- services grid (home) ---------- */
.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--gap);
}
.service-card {
  padding: 1.75rem 1.5rem;
  border: 1px solid var(--line);
  border-top: 3px solid var(--navy-800);
  background: var(--paper);
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.3s ease;
}
.service-card:hover { transform: translateY(-3px); box-shadow: 0 12px 24px -16px rgba(10, 26, 48, 0.35); }
.service-card h3 { font-size: 1.1rem; margin-bottom: 0; }
.service-card p { flex: 1; font-size: 0.92rem; }
.service-card .btn { align-self: flex-start; }

/* ---------- sourcing example card ---------- */
.example-card {
  display: flex;
  gap: 1.5rem;
  align-items: center;
  border: 1px solid var(--line-strong);
  padding: 1.5rem;
  background: var(--paper);
  flex-wrap: wrap;
}
.example-card .example-media { width: 140px; aspect-ratio: 1; background: var(--platinum-200); flex-shrink: 0; padding: 0.75rem; }
.example-card .example-media img { width: 100%; height: 100%; object-fit: contain; }
.example-card .example-body { flex: 1; min-width: 220px; }

/* ---------- responsive ---------- */
@media (max-width: 1080px) {
  .nav-links { display: none; }
  .nav-toggle { display: flex; align-items: center; justify-content: center; }
  /* backdrop-filter on .site-header creates a new containing block for its
     position:fixed descendants (per spec, same as transform/filter) — that
     breaks the full-screen mobile nav overlay below, anchoring it to the
     64px header box instead of the viewport. Drop it on mobile; the header's
     background is already near-opaque (0.92 alpha) so it reads solid either way. */
  .site-header { backdrop-filter: none; }
  body.nav-open .nav-links {
    display: flex;
    flex-direction: column;
    align-items: stretch;
    position: fixed;
    inset: 64px 0 0 0;
    background: var(--paper);
    padding: 2rem clamp(1.25rem, 4vw, 2.5rem);
    z-index: 49;
    gap: 1.5rem;
    font-size: 1.1rem;
    overflow-y: auto;
  }
  .nav-links li { align-items: stretch; }
  .nav-dropdown-label {
    justify-content: space-between;
    cursor: pointer;
  }
  .nav-dropdown-label svg { transition: transform 0.2s ease; }
  .has-dropdown.dropdown-open .nav-dropdown-label svg { transform: rotate(180deg); }
  .nav-dropdown {
    display: none;
    position: static;
    border: none;
    box-shadow: none;
    background: none;
    padding: 0.75rem 0 0 1.25rem;
    gap: 0.75rem;
    min-width: 0;
  }
  .has-dropdown.dropdown-open .nav-dropdown { display: flex; }
  .nav-dropdown a { padding: 0; font-size: 1rem; }
  .pillars { grid-template-columns: 1fr; }
  .trust-strip { grid-template-columns: repeat(2, 1fr); }
  .trust-item:nth-child(3) { border-left: none; }
  .cert-row, .about-grid, .contact-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .hero-specs { grid-template-columns: 1fr; gap: 1rem; }
  .value-list { grid-template-columns: 1fr; }
  .value-list li, .value-list li:nth-child(even) { padding-left: 0; }
  .lang-switch button { padding: 0.55rem 0.7rem; }
  .site-header .bar { padding: 0.75rem clamp(1rem, 4vw, 2.5rem); gap: 0.5rem; }
  .wordmark { font-size: 1.15rem; gap: 0.4rem; min-width: 0; }
  .wordmark small { display: none; }
  .logo-mark { height: 26px; }
  .header-actions { gap: 0.5rem; }
  .lang-switch { gap: 0.25rem; }
  .nav-toggle { padding: 0.7rem 0.75rem; }
}

@media (prefers-reduced-motion: reduce) {
  .hero::before { animation: none; }
}