/* ============================================
   SILVER TRADE INTERNATIONAL - Premium Stylesheet
   ============================================ */

:root {
  --navy: #0a1428;
  --navy-dark: #060e1e;
  --navy-mid: #0f1f3a;
  --gold: #b8942c;
  --gold-light: #d4ad3e;
  --gold-dark: #9a7a22;
  --gold-gradient: linear-gradient(135deg, #b8942c 0%, #d4ad3e 40%, #f0d060 60%, #b8942c 100%);
  --white: #ffffff;
  --off-white: #f5f3ee;
  --cream: #ece8de;
  --gray-100: #e8e5df;
  --gray-200: #c8c4bc;
  --gray-400: #8a8680;
  --gray-600: #5c5854;
  --gray-800: #2a2826;
  --text: #1a1816;
  --shadow-sm: 0 2px 8px rgba(10,20,40,0.06);
  --shadow: 0 8px 32px rgba(10,20,40,0.1);
  --shadow-lg: 0 16px 64px rgba(10,20,40,0.14);
  --shadow-xl: 0 24px 80px rgba(10,20,40,0.18);
  --radius: 16px;
  --radius-sm: 8px;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; font-size: 16px; }

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  color: var(--text); line-height: 1.7; background: var(--white);
  -webkit-font-smoothing: antialiased;
}

/* ===== Container ===== */
.container { max-width: 1280px; margin: 0 auto; padding: 0 32px; }

/* ===== Typography ===== */
h1, h2, h3, h4 { font-weight: 700; line-height: 1.2; letter-spacing: -0.02em; }
h1 { font-size: clamp(2.4rem, 5vw, 4rem); }
h2 { font-size: clamp(1.6rem, 3vw, 2.5rem); margin-bottom: 1rem; }
h3 { font-size: 1.35rem; margin-bottom: 0.75rem; }
p { margin-bottom: 1rem; color: var(--gray-600); line-height: 1.8; }
a { color: var(--gold-dark); text-decoration: none; transition: color 0.3s; }
a:hover { color: var(--gold); }
img { max-width: 100%; height: auto; }

/* ===== Decorative Elements ===== */
.gold-accent {
  width: 60px; height: 3px;
  background: var(--gold-gradient);
  border-radius: 2px;
  margin: 0 auto 24px;
}

/* ===== Header / Nav ===== */
header {
  background: var(--navy);
  position: sticky; top: 0; z-index: 1000;
  border-bottom: 1px solid rgba(255,255,255,0.06);
}
nav {
  display: flex; justify-content: space-between; align-items: center;
  padding: 0 32px; height: 80px; max-width: 1280px; margin: 0 auto;
}
.logo { display: flex; align-items: center; gap: 14px; text-decoration: none; }
.logo-icon {
  width: 44px; height: 44px;
  background: var(--gold-gradient);
  border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  font-size: 18px; color: var(--navy); font-weight: 900; letter-spacing: 1px;
}
.logo-text { color: var(--white); font-size: 1.2rem; font-weight: 600; letter-spacing: 0.02em; }
.logo-text span { color: var(--gold-light); }
.logo-subtitle { font-size: 0.65rem; color: rgba(255,255,255,0.35); letter-spacing: 0.08em; text-transform: uppercase; display: block; margin-top: -2px; }
.nav-links { display: flex; gap: 36px; align-items: center; list-style: none; }
.nav-links a {
  color: rgba(255,255,255,0.7); font-size: 0.88rem; font-weight: 500;
  transition: color 0.3s; position: relative; letter-spacing: 0.02em;
}
.nav-links a::after {
  content: ''; position: absolute; bottom: -4px; left: 0;
  width: 0; height: 2px; background: var(--gold-gradient);
  transition: width 0.3s; border-radius: 1px;
}
.nav-links a:hover::after, .nav-links a.active::after { width: 100%; }
.nav-links a:hover, .nav-links a.active { color: var(--white); }
.lang-switch { display: flex; gap: 4px; }
.lang-switch a {
  padding: 6px 14px; border-radius: 6px; font-size: 0.78rem;
  border: 1px solid rgba(255,255,255,0.15);
  background: transparent; color: rgba(255,255,255,0.6);
  text-transform: uppercase; letter-spacing: 0.06em;
}
.lang-switch a.active {
  background: var(--gold-gradient); color: var(--navy); border-color: transparent;
  font-weight: 700;
}
.lang-switch a::after { display: none; }
.mobile-toggle { display: none; flex-direction: column; gap: 5px; cursor: pointer; padding: 4px; }
.mobile-toggle span { width: 24px; height: 2px; background: var(--white); border-radius: 2px; transition: 0.3s; }

/* ===== Hero Section ===== */
.hero {
  background: linear-gradient(165deg, var(--navy-dark) 0%, var(--navy) 40%, var(--navy-mid) 70%, #142a4a 100%);
  color: var(--white); padding: 120px 0 100px;
  position: relative; overflow: hidden;
}
.hero::before {
  content: ""; position: absolute; top: -30%; right: -10%;
  width: 800px; height: 800px;
  background: radial-gradient(circle, rgba(180,148,44,0.06) 0%, transparent 65%);
  border-radius: 50%;
}
.hero::after {
  content: ""; position: absolute; bottom: 0; left: 0; right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(180,148,44,0.3), transparent);
}
.hero .container { position: relative; z-index: 1; }
.hero-badges { display: flex; gap: 12px; flex-wrap: wrap; margin-bottom: 2.5rem; }
.hero-badge {
  background: rgba(180,148,44,0.1); border: 1px solid rgba(180,148,44,0.2);
  padding: 8px 20px; border-radius: 24px;
  font-size: 0.82rem; color: var(--gold-light); letter-spacing: 0.04em;
  font-weight: 500;
}
.hero h1 { margin-bottom: 1.5rem; max-width: 800px; }
.hero h1 span { background: var(--gold-gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.hero p {
  font-size: 1.15rem; color: rgba(255,255,255,0.6);
  max-width: 640px; margin-bottom: 2.5rem; line-height: 1.9;
}
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }

.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 16px 40px; border-radius: var(--radius-sm);
  font-weight: 600; font-size: 0.95rem; cursor: pointer;
  transition: all 0.3s; border: none; text-decoration: none;
}
.btn-primary {
  background: var(--gold-gradient); color: var(--navy);
  box-shadow: 0 4px 20px rgba(180,148,44,0.3);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 32px rgba(180,148,44,0.4); }
.btn-outline {
  background: transparent; color: var(--white);
  border: 2px solid rgba(255,255,255,0.2);
}
.btn-outline:hover { border-color: var(--gold-light); color: var(--gold-light); }

/* ===== Sections ===== */
.section { padding: 100px 0; }
.section-alt { background: var(--off-white); position: relative; }
.section-title { text-align: center; margin-bottom: 4rem; }
.section-tag {
  display: inline-block; font-size: 0.72rem; text-transform: uppercase;
  letter-spacing: 0.2em; color: var(--gold-dark); font-weight: 700;
  margin-bottom: 12px;
}

/* ===== Stats ===== */
.stats-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 32px; text-align: center;
}
.stat-item {
  padding: 40px 24px;
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--radius);
  background: rgba(255,255,255,0.02);
  backdrop-filter: blur(10px);
}
.stat-item h3 { font-size: 3rem; color: var(--gold-light); margin-bottom: 4px; }
.stat-item p { font-size: 0.85rem; color: rgba(255,255,255,0.4); text-transform: uppercase; letter-spacing: 0.1em; }

/* ===== Product Grid ===== */
.products-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: 32px; }
.product-card {
  background: var(--white); border-radius: var(--radius); padding: 40px 36px;
  box-shadow: var(--shadow); transition: all 0.4s;
  border: 1px solid var(--gray-100); position: relative; overflow: hidden;
}
.product-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0;
  height: 3px; background: var(--gold-gradient); opacity: 0;
  transition: opacity 0.3s;
}
.product-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-xl); }
.product-card:hover::before { opacity: 1; }
.product-card img { width: 100%; max-width: 220px; height: auto; object-fit: cover; border-radius: 10px; margin: 0 auto 20px; display: block; }
.product-card h3 { font-size: 1.25rem; }
.product-card .spec { font-size: 0.82rem; color: var(--gray-400); margin: 8px 0; letter-spacing: 0.04em; }
.product-card > p { font-size: 0.92rem; color: var(--gray-600); }
.product-card .purity {
  display: inline-block;
  background: var(--gold-gradient); color: var(--navy);
  padding: 4px 14px; border-radius: 6px;
  font-size: 0.78rem; font-weight: 700; margin-top: 12px; letter-spacing: 0.04em;
}

/* ===== Features ===== */
.features-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 32px; }
.feature-card {
  padding: 40px 32px; border-radius: var(--radius);
  background: var(--white); box-shadow: var(--shadow);
  border: 1px solid var(--gray-100); transition: all 0.3s;
}
.feature-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.feature-icon { font-size: 2rem; margin-bottom: 1rem; display: block; }
.feature-card h3 { font-size: 1.1rem; }
.feature-card p { font-size: 0.9rem; }

/* ===== Process Flow ===== */
.process-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 32px; }
.process-card {
  background: var(--white); border-radius: var(--radius); padding: 48px 36px;
  text-align: center; box-shadow: var(--shadow);
  border: 1px solid var(--gray-100);
  position: relative; transition: all 0.4s;
}
.process-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-xl); }
.process-step {
  width: 56px; height: 56px; border-radius: 50%;
  background: var(--navy);
  color: var(--gold-light); font-size: 1.4rem; font-weight: 900;
  display: flex; align-items: center; justify-content: center;
  margin: 0 auto 24px; line-height: 1;
  border: 2px solid rgba(180,148,44,0.3);
  position: relative;
}
.process-card:nth-child(1) .process-step { background: var(--navy); }
.process-card:nth-child(2) .process-step { background: var(--navy-mid); }
.process-card:nth-child(3) .process-step { background: var(--navy-mid); }
.process-card h3 { font-size: 1.15rem; margin-bottom: 12px; }
.process-card p { font-size: 0.92rem; color: var(--gray-600); margin-bottom: 0; line-height: 1.8; }
.process-card strong { color: var(--gold-dark); }

/* ===== Contact Grid ===== */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: start; }
.form-group { margin-bottom: 24px; }
.form-group label { display: block; font-weight: 600; font-size: 0.85rem; margin-bottom: 8px; color: var(--gray-800); text-transform: uppercase; letter-spacing: 0.06em; }
.form-group input, .form-group select, .form-group textarea {
  width: 100%; padding: 16px 20px;
  border: 2px solid var(--gray-100);
  border-radius: var(--radius-sm);
  font-size: 0.95rem; font-family: inherit;
  transition: all 0.3s; background: var(--white);
  color: var(--text);
}
.form-group input:focus, .form-group select:focus, .form-group textarea:focus {
  outline: none; border-color: var(--gold);
  box-shadow: 0 0 0 4px rgba(180,148,44,0.1);
}
.form-group textarea { min-height: 140px; resize: vertical; }

/* ===== Footer ===== */
footer {
  background: var(--navy-dark);
  color: rgba(255,255,255,0.5);
  padding: 80px 0 32px;
  border-top: 1px solid rgba(255,255,255,0.05);
}
.footer-grid { display: grid; grid-template-columns: 2.5fr 1fr 1fr 1fr; gap: 48px; margin-bottom: 48px; }
footer h4 { color: var(--white); margin-bottom: 1.25rem; font-size: 0.9rem; text-transform: uppercase; letter-spacing: 0.1em; }
footer p { color: rgba(255,255,255,0.4); font-size: 0.88rem; line-height: 1.8; }
footer ul { list-style: none; }
footer ul li { margin-bottom: 10px; }
footer ul a { color: rgba(255,255,255,0.4); font-size: 0.88rem; }
footer ul a:hover { color: var(--gold-light); }
.footer-logo { font-size: 1.3rem; color: var(--white); font-weight: 700; margin-bottom: 16px; }
.footer-logo span { color: var(--gold-light); }
.footer-contact-item { display: flex; gap: 10px; margin-bottom: 12px; font-size: 0.88rem; color: rgba(255,255,255,0.4); }
.footer-contact-item a { color: rgba(255,255,255,0.4); }
.footer-contact-item a:hover { color: var(--gold-light); }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.05);
  padding-top: 24px; text-align: center;
  font-size: 0.82rem; color: rgba(255,255,255,0.3);
}

/* ===== Contact Info Block ===== */
.contact-info { margin-top: 32px; }
.contact-info-item { display: flex; gap: 16px; margin-bottom: 20px; align-items: flex-start; }
.contact-info-icon { font-size: 1.3rem; min-width: 28px; color: var(--gold); }

/* ===== Breadcrumb ===== */
.breadcrumb {
  padding: 20px 0; font-size: 0.82rem; color: var(--gray-400);
  max-width: 1280px; margin: 0 auto; padding-left: 32px; padding-right: 32px;
}
.breadcrumb a { color: var(--gray-400); }
.breadcrumb a:hover { color: var(--gold); }
.breadcrumb span { margin: 0 8px; }

/* ===== Page Header ===== */
.page-header { background: var(--navy); color: var(--white); padding: 80px 0 60px; position: relative; }
.page-header::after {
  content: ""; position: absolute; bottom: 0; left: 0; right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(180,148,44,0.3), transparent);
}
.page-header h1 { font-size: clamp(2rem, 4vw, 3rem); }
.page-header p { color: rgba(255,255,255,0.5); max-width: 600px; font-size: 1.05rem; }

/* ===== Product Detail ===== */
.product-detail-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: start; }
.product-specs { list-style: none; }
.product-specs li { padding: 16px 0; border-bottom: 1px solid var(--gray-100); display: flex; justify-content: space-between; }
.product-specs li:last-child { border-bottom: none; }
.spec-label { color: var(--gray-400); font-size: 0.85rem; }
.spec-value { font-weight: 600; }

/* ===== Blog ===== */
.blog-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(340px, 1fr)); gap: 32px; }
.blog-card {
  border-radius: var(--radius); overflow: hidden;
  box-shadow: var(--shadow); transition: all 0.4s;
  background: var(--white);
}
.blog-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-xl); }
.blog-card-img {
  height: 220px;
  background: linear-gradient(135deg, var(--navy-mid), var(--navy));
  display: flex; align-items: center; justify-content: center;
  color: var(--gold-light); font-size: 3.5rem;
}
.blog-card-body { padding: 32px; }
.blog-card-date { font-size: 0.78rem; color: var(--gray-400); margin-bottom: 10px; text-transform: uppercase; letter-spacing: 0.06em; }
.blog-card h3 { font-size: 1.15rem; margin-bottom: 10px; }
.blog-card h3 a { color: var(--text); }
.blog-card h3 a:hover { color: var(--gold); }
.blog-card p { font-size: 0.9rem; }

/* ===== Trust Bar ===== */
.trust-bar {
  display: flex; justify-content: center; gap: 60px; flex-wrap: wrap;
  padding: 32px 0; max-width: 1280px; margin: 0 auto;
}
.trust-item { text-align: center; font-size: 0.78rem; color: var(--gray-400); text-transform: uppercase; letter-spacing: 0.08em; }
.trust-item strong { display: block; color: var(--text); font-size: 0.88rem; margin-bottom: 4px; letter-spacing: 0.04em; }

/* ===== GEO Box ===== */
.geo-box {
  background: linear-gradient(135deg, var(--cream), var(--off-white));
  border: 1px solid var(--gray-100);
  border-radius: var(--radius); padding: 40px;
  margin: 32px 0;
}
.geo-box h3 { color: var(--navy); font-size: 1.1rem; margin-bottom: 20px; }
.geo-box p { font-size: 0.9rem; margin-bottom: 8px; }

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .process-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
}

@media (max-width: 768px) {
  .nav-links { display: none; position: absolute; top: 80px; left: 0; right: 0; background: var(--navy); flex-direction: column; padding: 32px; gap: 20px; box-shadow: var(--shadow-xl); border-bottom: 1px solid rgba(255,255,255,0.06); }
  .nav-links.open { display: flex; }
  .mobile-toggle { display: flex; }
  .hero { padding: 80px 0 60px; }
  .section { padding: 60px 0; }
  .contact-grid, .product-detail-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .hero-badges { gap: 8px; }
  .process-grid { grid-template-columns: 1fr; }
  .container { padding: 0 20px; }
  nav { padding: 0 20px; }
}

@media (max-width: 480px) {
  .stats-grid { grid-template-columns: 1fr 1fr; }
  .products-grid { grid-template-columns: 1fr; }
  .trust-bar { gap: 32px; }
}