/* ============================================
   BIFFORD INTERNATIONAL TRADING - MAIN STYLES
   ============================================ */

:root {
  --black: #0a0a0a;
  --dark: #111111;
  --dark2: #1a1a1a;
  --gold: #c9a84c;
  --gold-light: #e8c96e;
  --white: #ffffff;
  --off-white: #f5f0eb;
  --gray: #888888;
  --light-gray: #e5e5e5;
  --font-en: 'Playfair Display', Georgia, serif;
  --font-cn: 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --transition: all 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  background: var(--black);
  color: var(--white);
  font-family: var(--font-cn);
  line-height: 1.8;
  overflow-x: hidden;
}

h1, h2, h3 {
  font-family: var(--font-en);
  font-weight: 700;
  letter-spacing: 0.02em;
}

.section-label {
  font-size: 0.75rem;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 1rem;
  display: block;
}

.section-title {
  font-size: clamp(2rem, 4vw, 3.5rem);
  line-height: 1.15;
  margin-bottom: 1.5rem;
}

/* ============ NAVIGATION ============ */
nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  padding: 1.5rem 5%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: var(--transition);
}

nav.scrolled {
  background: rgba(10,10,10,0.96);
  backdrop-filter: blur(20px);
  padding: 1rem 5%;
  border-bottom: 1px solid rgba(201,168,76,0.2);
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  text-decoration: none;
}

.logo-icon {
  width: 42px;
  height: 42px;
  background: var(--gold);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 900;
  font-size: 1.2rem;
  color: var(--black);
  font-family: var(--font-en);
}

.logo-text .en {
  font-family: var(--font-en);
  font-size: 0.95rem;
  color: var(--white);
  font-weight: 600;
  letter-spacing: 0.05em;
  display: block;
  line-height: 1.2;
}

.logo-text .cn {
  font-size: 0.62rem;
  color: var(--gold);
  letter-spacing: 0.12em;
  display: block;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 2.5rem;
  list-style: none;
}

.nav-links a {
  color: rgba(255,255,255,0.8);
  text-decoration: none;
  font-size: 0.85rem;
  letter-spacing: 0.06em;
  transition: var(--transition);
  position: relative;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px; left: 0;
  width: 0; height: 1px;
  background: var(--gold);
  transition: var(--transition);
}

.nav-links a:hover { color: var(--gold); }
.nav-links a:hover::after { width: 100%; }

.lang-toggle {
  background: transparent;
  border: 1px solid rgba(201,168,76,0.5);
  color: var(--gold);
  padding: 0.4rem 1rem;
  font-size: 0.78rem;
  cursor: pointer;
  letter-spacing: 0.1em;
  transition: var(--transition);
}

.lang-toggle:hover { background: var(--gold); color: var(--black); }

.nav-mobile-btn {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 5px;
}

.nav-mobile-btn span {
  display: block;
  width: 25px; height: 1.5px;
  background: var(--white);
  transition: var(--transition);
}

/* ============ HERO ============ */
#hero {
  height: 100vh;
  min-height: 700px;
  position: relative;
  display: flex;
  align-items: center;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background-image: url('https://images.unsplash.com/photo-1558030006-450675393462?w=1800&q=80');
  background-size: cover;
  background-position: center 40%;
}

.hero-bg::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(0,0,0,0.88) 0%, rgba(0,0,0,0.5) 50%, rgba(0,0,0,0.3) 100%);
}

.hero-content {
  position: relative;
  z-index: 2;
  padding: 0 5%;
  max-width: 780px;
}

.hero-label {
  font-size: 0.72rem;
  letter-spacing: 0.4em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 1.5rem;
  display: flex;
  align-items: center;
  gap: 1rem;
}

.hero-label::before {
  content: '';
  width: 40px; height: 1px;
  background: var(--gold);
}

.hero-title {
  font-size: clamp(2.8rem, 6vw, 5.5rem);
  line-height: 1.05;
  margin-bottom: 1.5rem;
  color: var(--white);
}

.hero-title .gold { color: var(--gold); }

.hero-subtitle {
  font-size: 1rem;
  color: rgba(255,255,255,0.72);
  max-width: 520px;
  margin-bottom: 3rem;
  line-height: 1.9;
}

.hero-cta {
  display: flex;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.btn-primary {
  background: var(--gold);
  color: var(--black);
  padding: 1rem 2.5rem;
  text-decoration: none;
  font-weight: 700;
  font-size: 0.85rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.btn-primary:hover {
  background: var(--gold-light);
  transform: translateY(-2px);
  box-shadow: 0 10px 30px rgba(201,168,76,0.3);
}

.btn-outline {
  border: 1px solid rgba(255,255,255,0.4);
  color: var(--white);
  padding: 1rem 2.5rem;
  text-decoration: none;
  font-size: 0.85rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  transition: var(--transition);
}

.btn-outline:hover { border-color: var(--gold); color: var(--gold); }

.hero-scroll {
  position: absolute;
  bottom: 2.5rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  color: rgba(255,255,255,0.4);
  font-size: 0.68rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  z-index: 2;
}

.scroll-line {
  width: 1px; height: 50px;
  background: linear-gradient(to bottom, rgba(201,168,76,0.8), transparent);
  animation: scrollLine 2s ease infinite;
}

@keyframes scrollLine {
  0% { transform: scaleY(0); transform-origin: top; }
  50% { transform: scaleY(1); transform-origin: top; }
  51% { transform: scaleY(1); transform-origin: bottom; }
  100% { transform: scaleY(0); transform-origin: bottom; }
}

/* ============ STATS BAR ============ */
.stats-bar {
  background: var(--dark2);
  border-top: 1px solid rgba(201,168,76,0.2);
  border-bottom: 1px solid rgba(201,168,76,0.2);
  padding: 2.5rem 5%;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2rem;
}

.stat-item { text-align: center; }

.stat-number {
  font-family: var(--font-en);
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--gold);
  line-height: 1;
  margin-bottom: 0.3rem;
}

.stat-label { font-size: 0.8rem; color: var(--gray); letter-spacing: 0.1em; }

/* ============ ABOUT ============ */
#about {
  padding: 8rem 5%;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6rem;
  align-items: center;
}

.about-image { position: relative; }

.about-image img {
  width: 100%;
  height: 580px;
  object-fit: cover;
  display: block;
}

.about-image-accent {
  position: absolute;
  bottom: -2rem; right: -2rem;
  width: 200px; height: 200px;
  border: 2px solid var(--gold);
  z-index: -1;
}

.about-badge {
  position: absolute;
  top: 2rem; left: -2rem;
  background: var(--gold);
  color: var(--black);
  padding: 1.5rem;
  text-align: center;
  min-width: 120px;
}

.about-badge .years {
  font-family: var(--font-en);
  font-size: 2.5rem;
  font-weight: 700;
  line-height: 1;
}

.about-badge .label { font-size: 0.7rem; letter-spacing: 0.1em; margin-top: 0.3rem; }

.about-text p {
  color: rgba(255,255,255,0.7);
  margin-bottom: 1.5rem;
  font-size: 0.95rem;
  line-height: 1.9;
}

.about-values {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.2rem;
  margin-top: 3rem;
}

.value-item {
  padding: 1.4rem;
  border: 1px solid rgba(201,168,76,0.2);
  transition: var(--transition);
}

.value-item:hover {
  border-color: var(--gold);
  background: rgba(201,168,76,0.05);
}

.value-icon { font-size: 1.4rem; margin-bottom: 0.7rem; }

.value-title {
  font-size: 0.88rem;
  color: var(--gold);
  margin-bottom: 0.3rem;
  font-weight: 600;
}

.value-desc { font-size: 0.78rem; color: var(--gray); line-height: 1.6; }

/* ============ PRODUCTS ============ */
#products {
  padding: 8rem 5%;
  background: var(--dark2);
}

.products-header {
  text-align: center;
  margin-bottom: 5rem;
}

.products-header p { color: var(--gray); max-width: 600px; margin: 0 auto; }

/* Bilingual support */
body.lang-cn .en-text { display: none !important; }
body.lang-en .cn-text { display: none !important; }

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

.product-card {
  position: relative;
  height: 480px;
  overflow: hidden;
  cursor: pointer;
}

.product-card.featured { grid-column: span 2; }

.product-card img {
  width: 100%; height: 100%;
  object-fit: cover;
  transition: transform 0.8s ease;
}

.product-card:hover img { transform: scale(1.08); }

.product-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(0,0,0,0.92) 0%, rgba(0,0,0,0.2) 55%, transparent 100%);
  transition: var(--transition);
}

.product-info {
  position: absolute;
  bottom: 0; left: 0; right: 0;
  padding: 2rem;
}

.product-category {
  font-size: 0.68rem;
  letter-spacing: 0.3em;
  color: var(--gold);
  text-transform: uppercase;
  margin-bottom: 0.5rem;
}

.product-name {
  font-family: var(--font-en);
  font-size: 1.8rem;
  color: var(--white);
  line-height: 1.1;
  margin-bottom: 0.3rem;
}

.product-name-cn {
  font-size: 0.88rem;
  color: rgba(255,255,255,0.6);
  margin-bottom: 0.8rem;
}

.product-desc {
  font-size: 0.82rem;
  color: rgba(255,255,255,0.7);
  line-height: 1.7;
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.5s ease;
}

.product-card:hover .product-desc { max-height: 120px; }

.product-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--gold);
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  text-decoration: none;
  margin-top: 1rem;
  opacity: 0;
  transition: var(--transition);
}

.product-card:hover .product-link { opacity: 1; }

/* ============ CONSULTATION ============ */
#consultation { padding: 8rem 5%; }

.consultation-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6rem;
  align-items: start;
}

.consultation-text p {
  color: rgba(255,255,255,0.7);
  margin-bottom: 1.5rem;
  font-size: 0.95rem;
  line-height: 1.9;
}

.consult-features {
  display: flex;
  flex-direction: column;
  gap: 1.8rem;
  margin-top: 2.5rem;
}

.consult-feature {
  display: flex;
  gap: 1.2rem;
  align-items: flex-start;
}

.consult-feature-icon {
  width: 48px; height: 48px;
  border: 1px solid var(--gold);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  flex-shrink: 0;
  color: var(--gold);
}

.consult-feature-text h4 {
  font-size: 0.95rem;
  color: var(--white);
  margin-bottom: 0.3rem;
  font-family: var(--font-cn);
  font-weight: 600;
}

.consult-feature-text p {
  font-size: 0.82rem;
  color: var(--gray);
  line-height: 1.6;
  margin: 0;
}

.consultation-card {
  background: var(--dark2);
  border: 1px solid rgba(201,168,76,0.3);
  padding: 2.5rem;
}

.consultation-card h3 {
  font-size: 1.4rem;
  color: var(--gold);
  margin-bottom: 0.3rem;
}

.consultation-card .sub {
  font-size: 0.85rem;
  color: var(--gray);
  margin-bottom: 2rem;
  font-family: var(--font-cn);
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.contact-form input,
.contact-form textarea,
.contact-form select {
  width: 100%;
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.12);
  color: var(--white);
  padding: 0.9rem 1.2rem;
  font-size: 0.85rem;
  font-family: var(--font-cn);
  outline: none;
  transition: var(--transition);
}

.contact-form input:focus,
.contact-form textarea:focus,
.contact-form select:focus {
  border-color: var(--gold);
  background: rgba(201,168,76,0.04);
}

.contact-form input::placeholder,
.contact-form textarea::placeholder { color: rgba(255,255,255,0.3); }

.contact-form textarea { resize: vertical; min-height: 110px; }
.contact-form select option { background: #1a1a1a; }

.btn-submit {
  background: var(--gold);
  color: var(--black);
  border: none;
  padding: 1rem;
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  cursor: pointer;
  transition: var(--transition);
  font-family: var(--font-cn);
  width: 100%;
}

.btn-submit:hover {
  background: var(--gold-light);
  transform: translateY(-2px);
}

/* ============ SUITABLE FOR (适合谁) ============ */
.suitable-section {
  margin-top: 5rem;
  padding-top: 4rem;
  border-top: 1px solid rgba(201,168,76,0.15);
}
.suitable-heading {
  font-size: 1.6rem;
  color: var(--gold);
  margin-bottom: 2rem;
  font-family: var(--font-cn);
  text-align: center;
}
.suitable-foot {
  margin-top: 2rem;
  color: var(--gray);
  font-size: 0.9rem;
  text-align: center;
}
.suitable-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.2rem;
}
.suitable-item {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
  padding: 1.3rem;
  border: 1px solid rgba(201,168,76,0.18);
  background: rgba(201,168,76,0.03);
  transition: var(--transition);
}
.suitable-item:hover { border-color: var(--gold); background: rgba(201,168,76,0.06); }
.suitable-num {
  font-family: var(--font-en);
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--gold);
  line-height: 1;
  flex-shrink: 0;
}
.suitable-item h5 {
  font-size: 0.95rem;
  color: var(--white);
  margin-bottom: 0.4rem;
  font-weight: 600;
}
.suitable-item p {
  font-size: 0.82rem;
  color: var(--gray);
  line-height: 1.6;
}
@media (max-width: 1024px) {
  .suitable-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 600px) {
  .suitable-grid { grid-template-columns: 1fr; }
}

/* ============ NEWS ============ */
#news {
  padding: 8rem 5%;
  background: var(--dark2);
}

.news-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  margin-bottom: 4rem;
}

.news-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2px;
}

.news-card {
  position: relative;
  overflow: hidden;
  background: var(--dark);
  cursor: pointer;
}

.news-card-img {
  width: 100%;
  height: 260px;
  object-fit: cover;
  transition: transform 0.6s ease;
  display: block;
}

.news-card:hover .news-card-img { transform: scale(1.05); }

.news-card-body { padding: 1.5rem; }

.news-tag {
  font-size: 0.68rem;
  letter-spacing: 0.2em;
  color: var(--gold);
  text-transform: uppercase;
  margin-bottom: 0.6rem;
  display: block;
}

.news-title {
  font-size: 0.95rem;
  color: var(--white);
  line-height: 1.5;
  margin-bottom: 0.6rem;
  font-family: var(--font-cn);
  font-weight: 500;
}

.news-date { font-size: 0.75rem; color: var(--gray); }

/* ============ CONTACT ============ */
#contact { padding: 8rem 5%; }

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: 6rem;
}

.contact-info h2 { margin-bottom: 1rem; }

.contact-info > p {
  color: var(--gray);
  margin-bottom: 3rem;
  font-size: 0.95rem;
  line-height: 1.8;
}

.contact-details {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.contact-item {
  display: flex;
  gap: 1.2rem;
  align-items: flex-start;
}

.contact-item-icon {
  width: 44px; height: 44px;
  border: 1px solid rgba(201,168,76,0.4);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  color: var(--gold);
  flex-shrink: 0;
}

.contact-item-text label {
  display: block;
  font-size: 0.68rem;
  letter-spacing: 0.2em;
  color: var(--gold);
  text-transform: uppercase;
  margin-bottom: 0.3rem;
}

.contact-item-text span {
  font-size: 0.92rem;
  color: var(--white);
}

/* Contact visual panel */
.contact-visual {
  position: relative;
  min-height: 480px;
  overflow: hidden;
  background-image: url('../images/ship.jpg');
  background-size: cover;
  background-position: center;
  display: flex;
  align-items: flex-end;
}
.contact-visual-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(10,10,10,0.95) 0%, rgba(10,10,10,0.55) 60%, rgba(10,10,10,0.35) 100%);
}
.contact-visual-content {
  position: relative;
  z-index: 2;
  padding: 2.5rem;
}
.contact-visual-label {
  font-size: 0.72rem;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 0.6rem;
}
.contact-visual-title {
  font-family: var(--font-en);
  font-size: 2rem;
  font-weight: 700;
  color: var(--white);
  line-height: 1.1;
}
.contact-visual-line {
  width: 50px;
  height: 2px;
  background: var(--gold);
  margin: 1.2rem 0;
}
.contact-visual-text {
  color: rgba(255,255,255,0.85);
  font-size: 0.92rem;
  line-height: 1.9;
}
.contact-visual-text .muted { color: rgba(255,255,255,0.45); font-size: 0.8rem; }

.social-links {
  display: flex;
  gap: 0.8rem;
  margin-top: 2.5rem;
  flex-wrap: wrap;
}

.social-link {
  width: 38px; height: 38px;
  border: 1px solid rgba(255,255,255,0.18);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--gray);
  text-decoration: none;
  font-size: 0.85rem;
  transition: var(--transition);
}

.social-link:hover { border-color: var(--gold); color: var(--gold); }

/* ============ FOOTER ============ */
footer {
  background: var(--dark2);
  border-top: 1px solid rgba(201,168,76,0.15);
  padding: 2.5rem 5%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

.footer-copy { font-size: 0.78rem; color: var(--gray); }
.footer-icp { font-size: 0.72rem; color: rgba(255,255,255,0.25); }

.footer-links {
  display: flex;
  gap: 2rem;
  list-style: none;
}

.footer-links a {
  color: var(--gray);
  text-decoration: none;
  font-size: 0.78rem;
  transition: var(--transition);
}

.footer-links a:hover { color: var(--gold); }

/* ============ ANIMATIONS ============ */
.fade-up {
  opacity: 0;
  transform: translateY(35px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

.fade-up.visible { opacity: 1; transform: translateY(0); }

/* ============ RESPONSIVE ============ */
@media (max-width: 1024px) {
  .products-grid { grid-template-columns: repeat(2, 1fr); }
  .product-card.featured { grid-column: span 2; }
  #about { grid-template-columns: 1fr; }
  .about-image { display: none; }
  .consultation-inner { grid-template-columns: 1fr; gap: 3rem; }
  .contact-grid { grid-template-columns: 1fr; gap: 3rem; }
  .stats-bar { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .nav-links { display: none; }
  .nav-mobile-btn { display: flex; }
  .products-grid { grid-template-columns: 1fr; }
  .product-card.featured { grid-column: span 1; }
  .news-grid { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr; }
  .about-values { grid-template-columns: 1fr; }
  footer { flex-direction: column; text-align: center; }
  .news-header { flex-direction: column; align-items: flex-start; gap: 1rem; }
}