:root {
  --bg: #ffffff;
  --bg-soft: #f7f8fa;
  --bg-card: #f4f5f7;
  --panel: #ffffff;
  --panel-soft: #fafbfc;
  --line: rgba(0, 0, 0, 0.08);
  --text: #0f1117;
  --heading: #07090d;
  --muted: rgba(15, 17, 23, 0.62);
  --muted-strong: rgba(15, 17, 23, 0.82);
  --blue: #0f2b5c;
  --blue-soft: #1e4580;
  --blue-deep: #183b6e;
  --accent: #0f2b5c;
  --shadow: 0 8px 40px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 20px 60px rgba(0, 0, 0, 0.08);
  --radius-xl: 28px;
  --radius-lg: 20px;
  --radius-md: 14px;
  --max: 1280px;
  --transition: 280ms cubic-bezier(0.22, 0.61, 0.36, 1);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: "Manrope", sans-serif;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

/* ── Page Shell ── */
.page-shell {
  width: 100%;
  margin: 0 auto;
  overflow: hidden;
}

/* ── Site Header ── */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 14px 40px;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(18px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.site-header.scrolled {
  border-bottom-color: var(--line);
  box-shadow: 0 1px 0 rgba(0,0,0,0.04);
}

.brand {
  display: flex;
  align-items: center;
  gap: 14px;
}

.brand img {
  width: 44px;
  height: 44px;
}

.brand-copy strong {
  display: block;
  font-family: "Outfit", sans-serif;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--heading);
  line-height: 1.2;
}

.brand-copy span {
  color: var(--muted);
  font-size: 0.82rem;
}

.site-nav {
  display: flex;
  gap: 32px;
  flex-wrap: wrap;
}

.site-nav a {
  color: var(--muted-strong);
  font-size: 0.92rem;
  font-weight: 500;
  transition: color var(--transition);
}

.site-nav a:hover { color: var(--blue); }

.toolbar {
  display: flex;
  align-items: center;
  gap: 14px;
}

.lang-switcher {
  display: flex;
  gap: 2px;
  padding: 3px;
  border-radius: 8px;
  background: var(--bg-card);
}

.lang-switcher button,
.button,
.header-cta {
  border: none;
  font: inherit;
  cursor: pointer;
  transition: transform var(--transition), background var(--transition), color var(--transition), box-shadow var(--transition);
}

.lang-switcher button {
  padding: 6px 11px;
  border-radius: 6px;
  color: var(--muted);
  background: transparent;
  font-size: 0.8rem;
  font-weight: 600;
}

.lang-switcher button.is-active {
  color: #fff;
  background: var(--blue);
}

.button,
.header-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.9rem;
}

.header-cta {
  padding: 10px 20px;
  color: #fff;
  background: var(--blue);
}

.header-cta:hover,
.button.primary:hover {
  background: var(--blue-soft);
  transform: translateY(-1px);
  box-shadow: 0 8px 24px rgba(15, 43, 92, 0.2);
}

.button.primary {
  padding: 16px 28px;
  color: #fff;
  background: var(--blue);
}

.button.secondary {
  padding: 16px 28px;
  color: var(--blue);
  background: transparent;
  border: 1.5px solid var(--blue);
}

.button.secondary:hover {
  background: rgba(15, 43, 92, 0.04);
  transform: translateY(-1px);
}

/* ── Hero ── */
.hero {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: 180px 40px 80px;
  background:
    linear-gradient(180deg, rgba(255,255,255,0) 60%, rgba(255,255,255,1) 100%),
    rgba(0,0,0,0.45);
  background-blend-mode: overlay;
  text-align: center;
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: url("./assets/workshop-line.jpg") center/cover no-repeat;
  z-index: -1;
}

.hero-copy {
  max-width: 900px;
  margin: 0 auto;
}

.trust-ribbon {
  display: inline-flex;
  width: fit-content;
  margin: 0 auto 22px;
  padding: 8px 16px;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.15);
  backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.2);
  color: #fff;
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.03em;
}

.hero .eyebrow {
  margin: 0 0 16px;
  color: rgba(255, 255, 255, 0.85);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.hero h1 {
  margin: 0;
  font-family: "Outfit", sans-serif;
  font-size: clamp(2.8rem, 5vw, 5rem);
  line-height: 1.05;
  letter-spacing: -0.04em;
  color: #fff;
  text-shadow: 0 2px 40px rgba(0,0,0,0.3);
}

.hero-text {
  max-width: 680px;
  margin: 22px auto 0;
  font-size: 1.1rem;
  line-height: 1.75;
  color: rgba(255, 255, 255, 0.82);
}

.hero-actions {
  display: flex;
  justify-content: center;
  gap: 14px;
  margin-top: 32px;
}

.hero-actions .button.primary {
  background: #fff;
  color: var(--blue);
  font-weight: 700;
}

.hero-actions .button.primary:hover {
  background: #f0f2f6;
  box-shadow: 0 8px 24px rgba(0,0,0,0.15);
}

.hero-actions .button.secondary {
  color: #fff;
  border-color: rgba(255,255,255,0.5);
}

.hero-actions .button.secondary:hover {
  background: rgba(255,255,255,0.12);
}

.hero-subgrid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  margin-top: 48px;
}

.hero-point {
  padding: 24px 20px;
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(16px);
  border: 1px solid rgba(255, 255, 255, 0.15);
  text-align: left;
}

.hero-point strong {
  display: block;
  margin-bottom: 10px;
  font-family: "Outfit", sans-serif;
  font-size: 1.12rem;
  line-height: 1.2;
  color: #fff;
}

.hero-point p {
  margin: 0;
  line-height: 1.65;
  font-size: 0.92rem;
  color: rgba(255, 255, 255, 0.7);
}

.hero-media,
.hero-media-badge { display: none; }

/* ── Sections ── */
.section,
.cta {
  padding: 80px 40px;
}

.section-heading {
  max-width: 800px;
  margin-bottom: 48px;
}

.section-heading.split {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 40px;
  align-items: end;
  max-width: 1200px;
}

.eyebrow {
  margin: 0 0 14px;
  color: var(--blue);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.section-heading h2 {
  margin: 0 0 14px;
  font-family: "Outfit", sans-serif;
  font-size: clamp(2.2rem, 3.6vw, 3.8rem);
  line-height: 1.08;
  letter-spacing: -0.035em;
  color: var(--heading);
}

.section-heading p {
  margin: 0;
  line-height: 1.8;
  font-size: 1.05rem;
  color: var(--muted);
}

/* ── Content width constraints ── */
.section > :not(.section-heading),
.cta > :not(.section-heading) {
  max-width: var(--max);
  margin-left: auto;
  margin-right: auto;
}

.section-heading {
  max-width: var(--max);
  margin-left: auto;
  margin-right: auto;
}

/* ── Concept / Advantage Cards ── */
.advantage-grid,
.application-grid,
.engineering-grid,
.gallery-grid {
  display: grid;
  gap: 20px;
}

.advantage-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  max-width: var(--max);
  margin: 0 auto;
}

.advantage-card,
.application-card,
.engineering-card {
  border-radius: var(--radius-lg);
  background: var(--bg-card);
  border: 1px solid var(--line);
  overflow: hidden;
  transition: transform var(--transition), box-shadow var(--transition);
}

.advantage-card:hover,
.application-card:hover,
.engineering-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.advantage-card {
  padding: 32px 28px;
}

.advantage-card span {
  display: inline-block;
  margin-bottom: 18px;
  color: var(--blue);
  font-family: "Outfit", sans-serif;
  font-size: 2rem;
  font-weight: 800;
  line-height: 1;
  opacity: 0.3;
}

.advantage-card h3,
.application-card h3,
.engineering-card h3 {
  margin: 0 0 10px;
  font-family: "Outfit", sans-serif;
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--heading);
}

.advantage-card p,
.application-card p,
.engineering-card p {
  margin: 0;
  line-height: 1.75;
  color: var(--muted);
}

/* ── Applications ── */
.application-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  max-width: var(--max);
  margin: 0 auto;
}

.application-card img,
.engineering-card img {
  width: 100%;
  height: 280px;
  object-fit: cover;
}

.application-card div,
.engineering-card div {
  padding: 20px 24px 26px;
}

/* ── Stats ── */
.stats-grid {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
  max-width: var(--max);
  margin: 0 auto;
}

.stats-grid article {
  flex: 1 1 220px;
  min-height: 180px;
  padding: 32px 28px;
  border-radius: var(--radius-lg);
  background: var(--bg-card);
  border: 1px solid var(--line);
}

.stats-grid strong {
  display: block;
  margin-bottom: 10px;
  font-family: "Outfit", sans-serif;
  font-size: clamp(2.6rem, 5vw, 4.8rem);
  line-height: 1;
  color: var(--blue);
}

.stats-grid span {
  display: block;
  line-height: 1.65;
  color: var(--muted);
}

/* ── Engineering / Advantages ── */
.engineering-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  max-width: var(--max);
  margin: 0 auto;
}

/* ── Gallery ── */
.gallery-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  max-width: var(--max);
  margin: 0 auto;
}

.gallery-grid img {
  width: 100%;
  height: 340px;
  object-fit: cover;
  border-radius: var(--radius-lg);
  transition: transform var(--transition);
}

.gallery-grid img:hover {
  transform: scale(1.03);
}

/* ── Contact / CTA ── */
.cta {
  display: grid;
  grid-template-columns: 0.95fr 1.05fr;
  gap: 48px;
  max-width: var(--max);
  margin: 0 auto;
  background: var(--bg-soft);
  border-radius: var(--radius-xl);
  margin-top: 80px;
  margin-bottom: 0;
  padding: 72px 48px;
}

.cta h2 {
  margin: 0 0 16px;
  font-family: "Outfit", sans-serif;
  font-size: clamp(2rem, 3.6vw, 3.4rem);
  line-height: 1.08;
  letter-spacing: -0.03em;
  color: var(--heading);
}

.cta-copy p {
  margin: 0;
  line-height: 1.85;
  color: var(--muted);
}

.inquiry-form {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.inquiry-form label {
  display: grid;
  gap: 6px;
}

.inquiry-form span {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--heading);
}

.inquiry-form .full {
  grid-column: 1 / -1;
}

.inquiry-form input,
.inquiry-form textarea {
  width: 100%;
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: 8px;
  font: inherit;
  font-size: 0.95rem;
  color: var(--text);
  background: #fff;
  transition: border-color var(--transition);
}

.inquiry-form input:focus,
.inquiry-form textarea:focus {
  outline: none;
  border-color: var(--blue);
  box-shadow: 0 0 0 3px rgba(15, 43, 92, 0.08);
}

.inquiry-form textarea { resize: vertical; }

.inquiry-form .button.primary.full { margin-top: 4px; }

/* ── Footer ── */
.site-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 40px 40px 32px;
  background: var(--blue);
  color: rgba(255, 255, 255, 0.8);
}

.site-footer strong {
  display: block;
  margin-bottom: 4px;
  color: #fff;
  font-size: 1rem;
}

.site-footer p {
  margin: 0;
  font-size: 0.88rem;
  color: rgba(255, 255, 255, 0.55);
}

.site-footer a {
  font-size: 0.9rem;
  font-weight: 600;
  color: rgba(255, 255, 255, 0.85);
  transition: color var(--transition);
}

.site-footer a:hover { color: #fff; }

.footer-meta {
  display: flex;
  align-items: center;
  gap: 24px;
}

.footer-meta span {
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.45);
}

/* ── Back to top ── */
.back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background: var(--blue);
  color: #fff;
  border: none;
  font-size: 1.2rem;
  cursor: pointer;
  box-shadow: 0 4px 16px rgba(15, 43, 92, 0.25);
  opacity: 0;
  transform: translateY(12px);
  transition: opacity var(--transition), transform var(--transition);
  z-index: 99;
  display: flex;
  align-items: center;
  justify-content: center;
}

.back-to-top.visible {
  opacity: 1;
  transform: translateY(0);
}

.back-to-top:hover {
  background: var(--blue-soft);
  transform: translateY(-2px);
}

/* ── Scroll Animations ── */
.animate-on-scroll {
  opacity: 0;
  transform: translateY(32px);
  transition: opacity 0.7s cubic-bezier(0.22, 0.61, 0.36, 1),
              transform 0.7s cubic-bezier(0.22, 0.61, 0.36, 1);
}

.animate-on-scroll.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ── Responsive ── */
@media (max-width: 1100px) {
  .hero { min-height: auto; padding: 140px 28px 80px; }
  .hero h1 { font-size: clamp(2rem, 6vw, 3.4rem); }
  .hero-subgrid { grid-template-columns: 1fr; }
  .section-heading.split { grid-template-columns: 1fr; gap: 20px; }
  .cta { grid-template-columns: 1fr; gap: 32px; padding: 48px 28px; }
}

@media (max-width: 860px) {
  .site-header {
    position: fixed;
    flex-direction: column;
    align-items: stretch;
    gap: 12px;
    padding: 14px 20px;
  }

  .site-nav { justify-content: space-between; gap: 16px; }
  .toolbar { justify-content: space-between; }

  .section,
  .hero,
  .cta { padding: 48px 20px; }

  .hero { padding: 160px 20px 60px; }

  .advantage-grid,
  .application-grid,
  .engineering-grid,
  .gallery-grid,
  .inquiry-form { grid-template-columns: 1fr; }

  .gallery-grid img { height: 240px; }
  .application-card img,
  .engineering-card img { height: 220px; }
}

@media (max-width: 560px) {
  .site-nav,
  .toolbar,
  .stats-grid,
  .site-footer { flex-direction: column; align-items: stretch; }

  .lang-switcher { justify-content: space-between; }

  .hero h1 { font-size: 1.9rem; }
  .section-heading h2 { font-size: 1.7rem; }

  .cta { padding: 36px 20px; margin-top: 40px; }
  .site-footer { padding: 28px 20px; gap: 14px; }
}