/* ============================================================
   上益珠宝 · SHANGYI JEWELRY — 主样式
   ============================================================ */

/* --- CSS Variables --- */
:root {
  --color-primary: #1A72AC;
  --color-primary-light: #2897DF;
  --color-primary-lighter: #3EA1E2;
  --color-primary-dark: #01478D;
  --color-accent: #A9D5F2;
  --color-bg-light: #F5F8FA;
  --color-white: #FFFFFF;
  --color-black: #1A1A1A;
  --color-gray-50: #F9F9F9;
  --color-gray-100: #F0F0F0;
  --color-gray-200: #E0E0E0;
  --color-gray-300: #BFBFBF;
  --color-gray-400: #808080;
  --color-gray-500: #595959;
  --color-gray-600: #404040;
  --color-gold: #C9A96E;
  --color-gold-light: #E8D5A3;

  --font-cn: "思源黑体", "Source Han Sans SC", "Noto Sans SC", "Microsoft YaHei", sans-serif;
  --font-en: "Inter", "Segoe UI", system-ui, sans-serif;
  --font-display: "字由点字典黑", "ZhiYou", serif;

  --shadow-sm: 0 1px 3px rgba(0,0,0,.08);
  --shadow-md: 0 4px 12px rgba(0,0,0,.1);
  --shadow-lg: 0 8px 30px rgba(0,0,0,.12);
  --shadow-xl: 0 16px 48px rgba(0,0,0,.16);

  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;

  --transition: .3s cubic-bezier(.4,0,.2,1);

  --max-width: 1200px;
  --header-h: 72px;
}

/* --- Reset & Base --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  font-family: var(--font-cn);
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-gray-600);
  background: var(--color-white);
  overflow-x: hidden;
}

img { max-width: 100%; height: auto; display: block; }
a { color: var(--color-primary); text-decoration: none; transition: var(--transition); }
a:hover { color: var(--color-primary-dark); }
ul, ol { list-style: none; }

/* --- Typography --- */
h1, h2, h3, h4, h5, h6 { font-weight: 700; line-height: 1.3; color: var(--color-black); }

.section-title {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  text-align: center;
  margin-bottom: .5rem;
  letter-spacing: .02em;
}

.section-subtitle {
  font-size: 1rem;
  color: var(--color-gray-400);
  text-align: center;
  margin-bottom: 3rem;
  letter-spacing: .08em;
  text-transform: uppercase;
}

.section-subtitle.cn { text-transform: none; letter-spacing: .04em; }

/* --- Container --- */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}

/* --- Header / Nav --- */
.header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  height: var(--header-h);
  background: rgba(255,255,255,.97);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-gray-100);
  transition: var(--transition);
}

.header.scrolled { box-shadow: var(--shadow-md); }

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--color-primary-dark);
}

.logo-icon {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 18px;
  font-weight: 700;
  flex-shrink: 0;
}

.logo-text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.logo-text-cn { font-size: 1rem; letter-spacing: .05em; }
.logo-text-en { font-size: .65rem; color: var(--color-gray-400); letter-spacing: .08em; text-transform: uppercase; }

.nav { display: flex; align-items: center; gap: 4px; }

.nav a {
  padding: 8px 16px;
  font-size: .9rem;
  color: var(--color-gray-600);
  border-radius: var(--radius-sm);
  position: relative;
  white-space: nowrap;
}

.nav a:hover,
.nav a.active { color: var(--color-primary); background: rgba(41, 151, 223, .08); }

.nav a.nav-cta {
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
  color: white;
  padding: 8px 20px;
  border-radius: 50px;
  font-weight: 600;
}

.nav a.nav-cta:hover { transform: translateY(-1px); box-shadow: 0 4px 12px rgba(26, 114, 172, .3); }

/* --- Mobile nav --- */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav-toggle span {
  width: 24px;
  height: 2px;
  background: var(--color-gray-600);
  border-radius: 2px;
  transition: var(--transition);
}

/* --- Hero --- */
.hero {
  padding: calc(var(--header-h) + 40px) 0 80px;
  background: linear-gradient(135deg, #f5f8fa 0%, #e8f0f8 100%);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(41,151,223,.06) 0%, transparent 70%);
  border-radius: 50%;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: -30%;
  left: -10%;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(201,169,110,.08) 0%, transparent 70%);
  border-radius: 50%;
}

.hero .container { position: relative; z-index: 1; }

.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.hero-content h1 {
  font-size: clamp(2rem, 5vw, 3.2rem);
  margin-bottom: .75rem;
  letter-spacing: .02em;
}

.hero-content h1 span {
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-content .hero-sub {
  font-size: clamp(1rem, 2vw, 1.2rem);
  color: var(--color-gray-500);
  margin-bottom: 1.5rem;
  line-height: 1.6;
}

.hero-content .hero-desc {
  font-size: .95rem;
  color: var(--color-gray-400);
  margin-bottom: 2rem;
  max-width: 540px;
}

.hero-btns { display: flex; gap: 12px; flex-wrap: wrap; }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: 50px;
  font-weight: 600;
  font-size: .95rem;
  border: none;
  cursor: pointer;
  transition: var(--transition);
  font-family: var(--font-cn);
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
  color: white;
}

.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 6px 20px rgba(26, 114, 172, .35); color: white; }

.btn-outline {
  background: transparent;
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
}

.btn-outline:hover { background: var(--color-primary); color: white; }

.btn-gold {
  background: linear-gradient(135deg, var(--color-gold), var(--color-gold-light));
  color: white;
}

.btn-gold:hover { transform: translateY(-2px); box-shadow: 0 6px 20px rgba(201, 169, 110, .4); color: white; }

.hero-image {
  display: flex;
  justify-content: center;
  align-items: center;
}

.hero-image-placeholder {
  width: 100%;
  max-width: 480px;
  aspect-ratio: 4/3;
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, var(--color-primary-lighter), var(--color-accent));
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: white;
  text-align: center;
  padding: 40px;
  box-shadow: var(--shadow-xl);
}

.hero-image-placeholder .big-icon { font-size: 3.5rem; margin-bottom: 16px; opacity: .6; }
.hero-image-placeholder p { font-size: 1.1rem; opacity: .85; }

/* --- Stats Bar --- */
.stats-bar {
  background: var(--color-primary-dark);
  color: white;
  padding: 40px 0;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 30px;
  text-align: center;
}

.stat-item .stat-num {
  font-size: 2.5rem;
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: 4px;
}

.stat-item .stat-label { font-size: .9rem; opacity: .75; }

/* --- Sections common --- */
.section { padding: 80px 0; }
.section-alt { background: var(--color-bg-light); }

/* --- About preview --- */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 50px;
  align-items: center;
}

.about-text h3 { font-size: 1.6rem; margin-bottom: 1rem; }
.about-text p { margin-bottom: 1rem; color: var(--color-gray-500); }
.about-text .btn { margin-top: .5rem; }

.about-image-placeholder {
  width: 100%;
  aspect-ratio: 4/3;
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, #e8f0f8, #d4eaf9);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3rem;
  color: var(--color-primary-lighter);
  box-shadow: var(--shadow-md);
}

/* --- Products grid --- */
.products-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 24px;
}

.product-card {
  background: var(--color-white);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-gray-100);
  transition: var(--transition);
}

.product-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.product-card-image {
  height: 200px;
  background: linear-gradient(135deg, var(--color-bg-light), var(--color-accent));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.5rem;
  color: var(--color-primary-lighter);
}

.product-card-body { padding: 20px; }

.product-card-body h3 { font-size: 1.1rem; margin-bottom: 8px; }
.product-card-body p { font-size: .88rem; color: var(--color-gray-400); margin-bottom: 12px; line-height: 1.5; }

.product-card-body .tag {
  display: inline-block;
  padding: 2px 10px;
  background: rgba(41,151,223,.1);
  color: var(--color-primary);
  border-radius: 50px;
  font-size: .78rem;
  margin-right: 4px;
  margin-bottom: 4px;
}

/* --- Why Us --- */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 24px;
}

.feature-card {
  background: var(--color-white);
  border-radius: var(--radius-md);
  padding: 32px 24px;
  text-align: center;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-gray-100);
  transition: var(--transition);
}

.feature-card:hover { box-shadow: var(--shadow-md); transform: translateY(-2px); }

.feature-icon {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: linear-gradient(135deg, rgba(41,151,223,.12), rgba(41,151,223,.06));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin: 0 auto 16px;
}

.feature-card h3 { font-size: 1.05rem; margin-bottom: 8px; }
.feature-card p { font-size: .88rem; color: var(--color-gray-400); line-height: 1.5; }

/* --- Brand --- */
.brand-showcase {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: center;
}

.brand-info h3 { font-size: 1.5rem; margin-bottom: 1rem; }
.brand-info .brand-tag { display: inline-block; padding: 4px 16px; background: linear-gradient(135deg, var(--color-gold), var(--color-gold-light)); color: white; border-radius: 50px; font-size: .8rem; font-weight: 700; margin-bottom: 12px; text-transform: uppercase; letter-spacing: .1em; }
.brand-info p { margin-bottom: .8rem; color: var(--color-gray-500); }

/* --- CTA Section --- */
.cta-section {
  background: linear-gradient(135deg, var(--color-primary-dark), var(--color-primary));
  color: white;
  text-align: center;
  padding: 80px 0;
}

.cta-section h2 { font-size: clamp(1.8rem, 4vw, 2.4rem); color: white; margin-bottom: .5rem; }
.cta-section p { font-size: 1rem; opacity: .85; margin-bottom: 2rem; max-width: 600px; margin-left: auto; margin-right: auto; }

/* --- Footer --- */
.footer {
  background: #111;
  color: rgba(255,255,255,.7);
  padding: 60px 0 30px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}

.footer-brand .logo { color: white; margin-bottom: 12px; }
.footer-brand .logo .logo-text-en { color: rgba(255,255,255,.5); }
.footer-brand p { font-size: .88rem; line-height: 1.6; }

.footer h4 { color: white; font-size: 1rem; margin-bottom: 16px; }
.footer-links a {
  display: block;
  padding: 4px 0;
  font-size: .88rem;
  color: rgba(255,255,255,.6);
}

.footer-links a:hover { color: white; }

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,.1);
  padding-top: 20px;
  text-align: center;
  font-size: .82rem;
  color: rgba(255,255,255,.4);
}

/* --- Page Banner --- */
.page-banner {
  padding: calc(var(--header-h) + 60px) 0 40px;
  background: linear-gradient(135deg, #f5f8fa, #e8f0f8);
  text-align: center;
}

.page-banner h1 { font-size: clamp(1.8rem, 4vw, 2.6rem); margin-bottom: .5rem; }
.page-banner p { color: var(--color-gray-400); max-width: 600px; margin: 0 auto; font-size: .95rem; }

/* --- Breadcrumb --- */
.breadcrumb {
  padding: 12px 0;
  font-size: .82rem;
  color: var(--color-gray-400);
}

.breadcrumb a { color: var(--color-gray-400); }
.breadcrumb a:hover { color: var(--color-primary); }
.breadcrumb .sep { margin: 0 8px; }

/* --- Geo Page Styles --- */
.geo-header {
  background: linear-gradient(135deg, var(--color-primary-dark), var(--color-primary));
  color: white;
  text-align: center;
  padding: calc(var(--header-h) + 60px) 0 50px;
}

.geo-header h1 { font-size: clamp(1.8rem, 4vw, 2.6rem); color: white; margin-bottom: .5rem; }
.geo-header p { font-size: 1rem; opacity: .85; max-width: 700px; margin: 0 auto; }

.geo-why {
  background: var(--color-bg-light);
  padding: 60px 0;
}

.geo-why-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 20px;
  margin-top: 30px;
}

.geo-why-item {
  background: white;
  padding: 24px;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
}

.geo-why-item h3 { font-size: 1rem; margin-bottom: 6px; color: var(--color-primary-dark); }
.geo-why-item p { font-size: .88rem; color: var(--color-gray-500); }

.geo-gallery {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 16px;
}

.geo-gallery-item {
  aspect-ratio: 1;
  background: linear-gradient(135deg, var(--color-bg-light), var(--color-accent));
  border-radius: var(--radius-sm);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  font-size: .85rem;
  color: var(--color-gray-500);
}

.geo-contact-info {
  background: white;
  border-radius: var(--radius-md);
  padding: 30px;
  box-shadow: var(--shadow-md);
}

.geo-contact-info h3 { font-size: 1.1rem; margin-bottom: 16px; color: var(--color-primary-dark); }
.geo-contact-info p { margin-bottom: 8px; font-size: .92rem; }
.geo-contact-info .label { color: var(--color-gray-400); }

/* --- Geo City List --- */
.city-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: 10px;
  margin: 20px 0;
}

.city-link {
  display: block;
  padding: 12px 16px;
  text-align: center;
  background: var(--color-bg-light);
  border-radius: var(--radius-sm);
  color: var(--color-gray-600);
  font-size: .9rem;
  transition: var(--transition);
  border: 1px solid transparent;
}

.city-link:hover {
  background: white;
  border-color: var(--color-primary-light);
  color: var(--color-primary);
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}

/* --- Materials Page --- */
.materials-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 30px;
}

.material-card {
  background: white;
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-gray-100);
  transition: var(--transition);
}

.material-card:hover { box-shadow: var(--shadow-md); }

.material-card-header {
  padding: 24px;
  background: linear-gradient(135deg, var(--color-bg-light), var(--color-accent));
}

.material-card-header h3 { font-size: 1.2rem; color: var(--color-primary-dark); margin-bottom: 4px; }
.material-card-header .en { font-size: .8rem; color: var(--color-gray-400); letter-spacing: .08em; }

.material-card-body { padding: 20px 24px; }
.material-card-body ul { margin: 0; }
.material-card-body li {
  padding: 4px 0;
  font-size: .9rem;
  color: var(--color-gray-500);
  padding-left: 16px;
  position: relative;
}
.material-card-body li::before { content: '◆'; position: absolute; left: 0; font-size: .6rem; color: var(--color-primary-light); top: 7px; }

/* --- Process Timeline --- */
.process-timeline {
  position: relative;
  padding-left: 40px;
}

.process-timeline::before {
  content: '';
  position: absolute;
  left: 15px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--color-primary-light), var(--color-accent));
}

.process-step {
  position: relative;
  margin-bottom: 30px;
  padding: 20px 24px;
  background: white;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-gray-100);
}

.process-step::before {
  content: attr(data-step);
  position: absolute;
  left: -32px;
  top: 22px;
  width: 28px;
  height: 28px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: .75rem;
  font-weight: 700;
}

.process-step h3 { font-size: 1rem; margin-bottom: 4px; color: var(--color-primary-dark); }
.process-step .en { font-size: .8rem; color: var(--color-gray-400); margin-bottom: 6px; }
.process-step p { font-size: .88rem; color: var(--color-gray-500); line-height: 1.5; }

/* --- QC Cards --- */
.qc-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}

.qc-card {
  background: white;
  border-radius: var(--radius-md);
  padding: 28px;
  text-align: center;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-gray-100);
}

.qc-card .icon { font-size: 2rem; margin-bottom: 12px; }
.qc-card h3 { font-size: 1rem; margin-bottom: 6px; color: var(--color-primary-dark); }
.qc-card .en { font-size: .8rem; color: var(--color-gray-400); margin-bottom: 8px; }
.qc-card p { font-size: .85rem; color: var(--color-gray-500); }

/* --- Responsive --- */
@media (max-width: 992px) {
  .hero-grid { grid-template-columns: 1fr; gap: 40px; }
  .hero-image { order: -1; }
  .hero-image-placeholder { max-width: 100%; }
  .about-grid { grid-template-columns: 1fr; }
  .brand-showcase { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 20px; }
}

@media (max-width: 768px) {
  .nav { display: none; }
  .nav.open { display: flex; flex-direction: column; position: absolute; top: var(--header-h); left: 0; right: 0; background: white; padding: 16px; box-shadow: var(--shadow-lg); gap: 2px; }
  .nav.open a { padding: 12px 16px; width: 100%; }
  .nav-toggle { display: flex; }
  .section { padding: 50px 0; }
  .products-grid { grid-template-columns: 1fr 1fr; }
  .materials-grid { grid-template-columns: 1fr; }
  .geo-why-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 30px; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 16px; }
  .stat-item .stat-num { font-size: 2rem; }
}

@media (max-width: 480px) {
  .products-grid { grid-template-columns: 1fr; }
  .hero-btns { flex-direction: column; }
  .hero-btns .btn { width: 100%; justify-content: center; }
  .city-grid { grid-template-columns: repeat(2, 1fr); }
}

/* --- Back to Top --- */
.back-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--color-primary);
  color: white;
  border: none;
  font-size: 1.2rem;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
  box-shadow: var(--shadow-md);
  z-index: 999;
}

.back-top.visible { opacity: 1; visibility: visible; }
.back-top:hover { transform: translateY(-2px); box-shadow: var(--shadow-lg); }

/* --- Geolocation keyword highlight --- */
.keyword-highlight {
  background: linear-gradient(135deg, var(--color-gold), var(--color-gold-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  font-weight: 700;
}

/* --- Product detail grid --- */
.product-detail-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: start;
}

.product-detail-image {
  background: linear-gradient(135deg, var(--color-bg-light), var(--color-accent));
  border-radius: var(--radius-lg);
  aspect-ratio: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 4rem;
  color: var(--color-primary-lighter);
}

.product-detail-info h2 { font-size: 1.8rem; margin-bottom: .5rem; }
.product-detail-info .en { font-size: .9rem; color: var(--color-gray-400); letter-spacing: .08em; margin-bottom: 1rem; }
.product-detail-info p { margin-bottom: 1rem; color: var(--color-gray-500); }
.product-detail-info ul { margin-bottom: 1.5rem; }
.product-detail-info li {
  padding: 4px 0;
  font-size: .9rem;
  padding-left: 20px;
  position: relative;
  color: var(--color-gray-500);
}
.product-detail-info li::before { content: '✓'; position: absolute; left: 0; color: var(--color-primary); font-weight: 700; }

/* --- Animation helpers --- */
.fade-in { opacity: 0; transform: translateY(20px); transition: opacity .6s ease, transform .6s ease; }
.fade-in.visible { opacity: 1; transform: translateY(0); }