/* ============ RESET & BASE ============ */
* { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --dark: #111827;          /* primary dark */
  --secondary-dark: #1F2937;/* secondary dark */
  --accent: #BFA45A;        /* gold accent */
  --gold-bg: #F4EEDC;       /* soft gold bg */
  --bg: #F8F7F2;            /* main background */
  --bg-alt: #FFFFFF;        /* alternate section bg */
  --border: #E5E1D6;        /* border gray */
  --text: #4B5563;          /* text gray */
  --heading: #201843;       /* heading text (dark blue) */
  --muted: #6b7280;
  --nav-h: 76px;
}

html { scroll-behavior: smooth; }

body {
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* ============ HEADER / NAV ============ */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-h);
  z-index: 100;
  /* transparent over hero; JS adds .scrolled for solid bg */
  transition: background 0.3s ease, box-shadow 0.3s ease;
}
.site-header.scrolled {
  background: rgba(17, 22, 29, 0.92);
  box-shadow: 0 2px 16px rgba(0,0,0,0.15);
}

.nav {
  max-width: 1280px;
  height: 100%;
  margin: 0 auto;
  padding: 0 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* Round logo */
.logo {
  width: 52px; height: 52px;
  border-radius: 50%;
  background: var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  flex-shrink: 0;
  border: 2px solid rgba(255,255,255,0.7);
  transition: transform 0.25s ease;
}
.logo:hover { transform: scale(1.06); }
.logo-text {
  color: #fff;
  font-weight: 700;
  font-size: 0.82rem;
  letter-spacing: 0.3px;
}

.nav-right {
  display: flex;
  align-items: center;
  gap: 30px;
}
.nav-links {
  display: flex;
  gap: 38px;
  list-style: none;
}

/* Language switch — outlined pill */
.lang-btn {
  display: inline-block;
  border: 1.5px solid rgba(255,255,255,0.65);
  color: #fff;
  text-decoration: none;
  padding: 7px 22px;
  border-radius: 22px;
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  text-shadow: 0 1px 3px rgba(0,0,0,0.4);
  transition: background 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}
.lang-btn:hover {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
  text-shadow: none;
}
.nav-links a {
  color: #fff;
  text-decoration: none;
  font-size: 0.98rem;
  font-weight: 500;
  letter-spacing: 0.3px;
  position: relative;
  padding: 4px 0;
  text-shadow: 0 1px 3px rgba(0,0,0,0.4);
}
/* underline-grow hover effect */
.nav-links a::after {
  content: "";
  position: absolute;
  left: 0; bottom: -2px;
  width: 0; height: 2px;
  background: var(--accent);
  transition: width 0.28s ease;
}
.nav-links a:hover::after { width: 100%; }

.nav-toggle {
  display: none;
  background: none;
  border: none;
  color: #fff;
  font-size: 1.6rem;
  cursor: pointer;
}

/* ============ HERO ============ */
.hero {
  position: relative;
  height: 100vh;
  min-height: 560px;
  background: url("assets/hero.jpg") center center / cover no-repeat;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
}
.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to bottom, rgba(10,14,20,0.45), rgba(10,14,20,0.65));
}
.hero-content {
  position: relative;
  z-index: 2;
  color: #fff;
  max-width: 760px;
  padding: 0 24px;
}
.hero-content h1 {
  font-size: clamp(2.2rem, 5vw, 3.6rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.12;
  margin-bottom: 18px;
  text-shadow: 0 2px 18px rgba(0,0,0,0.4);
}
.hero-content p {
  font-size: clamp(1rem, 2vw, 1.25rem);
  margin-bottom: 30px;
  opacity: 0.95;
}

.btn {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  text-decoration: none;
  padding: 14px 34px;
  border-radius: 4px;
  font-weight: 600;
  letter-spacing: 0.4px;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  box-shadow: 0 6px 20px rgba(200,163,91,0.35);
}
.btn:hover { transform: translateY(-2px); box-shadow: 0 10px 26px rgba(200,163,91,0.45); }

/* ============ SECTIONS ============ */
.section { padding: 88px 0; }
.section.alt { background: var(--bg-alt); }

/* 2/3 width centered → 1/6 gutter each side */
.section-narrow .container {
  width: 66.66%;
  margin: 0 auto;
}
.container { max-width: 980px; }

.section h2 {
  font-size: clamp(1.8rem, 3.5vw, 2.4rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--heading);
  margin-bottom: 14px;
  text-align: center;
}
.lead {
  text-align: center;
  color: var(--muted);
  font-size: 1.1rem;
  margin-bottom: 48px;
}

/* ============ PRODUCTS (large, slider banners) ============ */
.section-products { padding: 104px 0; }
.container-wide { max-width: 1200px; margin: 0 auto; padding: 0 32px; }

.products {
  display: flex;
  flex-direction: column;
  gap: 80px;
  margin-top: 60px;
}

.product {
  display: grid;
  grid-template-columns: 1.25fr 1fr;
  gap: 48px;
  align-items: center;
}
/* Alternate image/text sides */
.product-reverse .carousel { order: 2; }

.product-info h3 {
  font-size: 1.9rem;
  font-weight: 800;
  letter-spacing: -0.015em;
  color: var(--heading);
  margin-bottom: 16px;
  position: relative;
  padding-bottom: 12px;
}
.product-info h3::after {
  content: "";
  position: absolute;
  left: 0; bottom: 0;
  width: 56px; height: 3px;
  background: var(--accent);
}
.product-info p { color: var(--muted); font-size: 1.05rem; line-height: 1.75; }

/* Carousel */
.carousel {
  position: relative;
  height: 440px;
  border-radius: 14px;
  overflow: hidden;
  background: var(--dark);   /* backdrop for letterboxed (contain) photos */
  box-shadow: 0 18px 44px rgba(0,0,0,0.14);
}
.slides { position: absolute; inset: 0; }
.slide {
  position: absolute;
  inset: 0;
  background-size: cover;          /* fill the box edge-to-edge, no black bands */
  background-position: center;
  background-repeat: no-repeat;
  opacity: 0;
  transition: opacity 0.9s ease;
}
.slide.active { opacity: 1; }
.car-placeholder {
  opacity: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  background: repeating-linear-gradient(45deg, #eceef1, #eceef1 14px, #e4e7eb 14px, #e4e7eb 28px);
  color: #9aa1ac;
  font-size: 1rem;
  letter-spacing: 0.3px;
}

/* Carousel arrows */
.car-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 44px; height: 44px;
  border: none;
  border-radius: 50%;
  background: rgba(17,22,29,0.5);
  color: #fff;
  font-size: 1.5rem;
  line-height: 1;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s ease;
  z-index: 3;
}
.car-btn:hover { background: rgba(200,163,91,0.92); }
.car-prev { left: 14px; }
.car-next { right: 14px; }

/* Carousel dots */
.dots {
  position: absolute;
  bottom: 16px; left: 0; right: 0;
  display: flex;
  justify-content: center;
  gap: 9px;
  z-index: 3;
}
.dot {
  width: 9px; height: 9px;
  border-radius: 50%;
  background: rgba(255,255,255,0.55);
  cursor: pointer;
  transition: background 0.2s ease, transform 0.2s ease;
}
.dot.active { background: var(--accent); transform: scale(1.25); }

@media (max-width: 860px) {
  .product { grid-template-columns: 1fr; gap: 24px; }
  .product-reverse .carousel { order: 0; }
  .carousel { height: 300px; }
}

/* Industry banner — 3/4 width, centered */
.industry-banner {
  width: 75%;
  height: 520px;
  margin: 64px auto 0;
  border-radius: 14px;
  box-shadow: 0 18px 44px rgba(0,0,0,0.14);
}
@media (max-width: 860px) {
  .industry-banner { width: 90%; height: 320px; margin-top: 40px; }
}

/* Key projects (Industry Partners) */
.projects { margin-top: 24px; }
.projects-intro {
  text-align: center;
  color: var(--text);
  font-size: 1.05rem;
  margin-bottom: 32px;
}
.project-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 20px;
}
@media (max-width: 980px) {
  .project-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 560px) {
  .project-grid { grid-template-columns: 1fr; }
}
.project-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}
.project-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 14px 30px rgba(0,0,0,0.09);
}
/* Photo on top (placeholder until a real image is set) */
.project-photo {
  position: relative;
  height: 130px;
  background-size: cover;
  background-position: center;
  background-color: var(--secondary-dark);
  background-image: repeating-linear-gradient(45deg, rgba(255,255,255,0.04), rgba(255,255,255,0.04) 12px, rgba(255,255,255,0) 12px, rgba(255,255,255,0) 24px);
}
.project-num {
  position: absolute;
  top: 10px; left: 10px;
  background: var(--accent);
  color: #fff;
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  padding: 3px 9px;
  border-radius: 5px;
}
.project-body { padding: 20px 18px 22px; }
.project-loc {
  margin-top: 10px;
  font-size: 0.8rem;
  color: var(--muted);
  text-align: center;
}
.project-tag {
  display: block;
  width: fit-content;
  margin-left: auto;
  margin-right: auto;
  text-align: center;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent);
  background: var(--gold-bg);
  padding: 4px 10px;
  border-radius: 20px;
  margin-bottom: 14px;
}
.project-card h4 {
  color: var(--heading);
  font-size: 1rem;
  font-weight: 600;
  line-height: 1.45;
  text-align: center;
}

/* Stats row (Industry) */
.stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  margin-top: 44px;
}
.stat {
  text-align: center;
  padding: 28px 20px;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 10px;
}
.stat-num {
  display: block;
  font-size: 2rem;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 8px;
}
.stat-label {
  display: block;
  font-size: 0.9rem;
  color: var(--muted);
  line-height: 1.45;
}
@media (max-width: 860px) {
  .stats { grid-template-columns: 1fr; }
}

/* ============ FOOTER ============ */
.site-footer {
  background: var(--dark);
  color: #cbd2dc;
  padding: 64px 24px 36px;
}
.footer-grid {
  max-width: 1100px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}
.footer-info {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 16px;
}
.logo-footer { width: 60px; height: 60px; }
.footer-heading {
  color: #fff;
  font-size: 1.4rem;
  font-weight: 800;
  letter-spacing: -0.01em;
}
.footer-address {
  color: #e2e8f0;
  font-size: 1.02rem;
  line-height: 1.7;
  margin: 0;
}
.footer-address-en {
  color: #8a93a0;
  font-size: 0.9rem;
  line-height: 1.6;
  margin: 0;
}
.contact-btn {
  display: inline-block;
  margin-top: 6px;
  background: var(--accent);
  color: #fff;
  text-decoration: none;
  padding: 12px 30px;
  border-radius: 4px;
  font-weight: 600;
  letter-spacing: 0.3px;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  box-shadow: 0 6px 18px rgba(200,163,91,0.3);
}
.contact-btn:hover { transform: translateY(-2px); box-shadow: 0 10px 24px rgba(200,163,91,0.45); }

.footer-photo {
  height: 260px;
  border-radius: 12px;
  background-size: cover;
  background-position: center;
  box-shadow: 0 12px 30px rgba(0,0,0,0.3);
}
.copyright {
  text-align: center;
  font-size: 0.85rem;
  color: #6b7280;
  margin-top: 44px;
  padding-top: 24px;
  border-top: 1px solid rgba(255,255,255,0.08);
}
@media (max-width: 760px) {
  .footer-grid { grid-template-columns: 1fr; gap: 28px; }
  .footer-photo { height: 200px; }
}

/* ============ RESPONSIVE ============ */
@media (max-width: 860px) {
  .section-narrow .container { width: 88%; }
  .cards { grid-template-columns: 1fr; }
  .nav-links {
    position: fixed;
    top: var(--nav-h); right: 0;
    background: rgba(17,22,29,0.97);
    flex-direction: column;
    gap: 0;
    width: 220px;
    padding: 12px 0;
    transform: translateX(100%);
    transition: transform 0.3s ease;
  }
  .nav-links.open { transform: translateX(0); }
  .nav-links li { padding: 12px 24px; }
  .nav-toggle { display: block; margin-left: 14px; }
  /* push lang button to the right, next to the hamburger */
  .nav-right { margin-left: auto; }
}