/* ============================================================
   Weihui Plastic Profile, Inc. — Global Stylesheet
   Brand: Dark Navy (#1C3A6E) + White + accent Blue (#2E6DB4)
   ============================================================ */

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

html { scroll-behavior: smooth; overflow-x: hidden; }

body {
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: #222;
  background: #fff;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }

/* ── CSS Variables ── */
:root {
  --navy:      #1B3561;
  --navy-dark: #112040;
  --navy-mid:  #234280;
  --blue:      #2E6DB4;
  --blue-light:#4A8FD4;
  --white:     #ffffff;
  --off-white: #F5F7FA;
  --gray-light:#E8ECF2;
  --gray:      #6B7280;
  --text:      #1A1A2E;
  --text-light:#4B5563;
  --gold:      #C89A2E;

  --max-w: 1160px;
  --radius: 6px;
  --shadow: 0 2px 16px rgba(28,58,110,0.10);
  --shadow-lg: 0 8px 40px rgba(28,58,110,0.14);
  --transition: 0.2s ease;
}

/* ── Typography ── */
h1, h2, h3, h4, h5 {
  font-weight: 700;
  line-height: 1.2;
  color: var(--navy);
}

h1 { font-size: clamp(2rem, 4vw, 3rem); }
h2 { font-size: clamp(1.5rem, 3vw, 2.2rem); }
h3 { font-size: clamp(1.1rem, 2vw, 1.4rem); }
h4 { font-size: 1.1rem; }

p { color: var(--text-light); margin-bottom: 1rem; }
p:last-child { margin-bottom: 0; }

.lead {
  font-size: 1.15rem;
  color: var(--text-light);
  line-height: 1.7;
}

/* ── Layout ── */
.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 24px;
}

section { padding: 80px 0; }

.section-label {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--blue);
  margin-bottom: 12px;
}

.section-header {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 56px;
}

.section-header h2 { margin-bottom: 16px; }
.section-header p { font-size: 1.05rem; }

/* ── Buttons ── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  border: 2px solid transparent;
  transition: all var(--transition);
  letter-spacing: 0.02em;
}

.btn-primary {
  background: var(--blue);
  color: var(--white);
  border-color: var(--blue);
}
.btn-primary:hover {
  background: #1f5a9e;
  border-color: #1f5a9e;
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(46,109,180,0.3);
}

.btn-outline {
  background: transparent;
  color: var(--white);
  border-color: rgba(255,255,255,0.6);
}
.btn-outline:hover {
  background: rgba(255,255,255,0.12);
  border-color: var(--white);
}

.btn-outline-navy {
  background: transparent;
  color: var(--navy);
  border-color: var(--navy);
}
.btn-outline-navy:hover {
  background: var(--navy);
  color: var(--white);
}

/* ── Navigation ── */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--navy);
  box-shadow: 0 2px 12px rgba(0,0,0,0.2);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 84px;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--white);
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: 0.01em;
}

.nav-logo .logo-mark {
  width: 42px;
  height: 42px;
  background: var(--blue);
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  font-weight: 900;
  color: #fff;
  letter-spacing: -0.03em;
  flex-shrink: 0;
}

.nav-logo .logo-mark-img {
  height: 58px;
  width: auto;
  display: block;
  flex-shrink: 0;
}

.nav-logo .logo-text {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}
.nav-logo .logo-text span:first-child {
  font-size: 1.1rem;
  font-weight: 800;
}
.nav-logo .logo-text span:last-child {
  font-size: 0.65rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  opacity: 0.75;
}

.nav-links {
  display: flex;
  align-items: center;
  list-style: none;
  gap: 6px;
}

.nav-links a {
  color: rgba(255,255,255,0.85);
  font-size: 0.9rem;
  font-weight: 500;
  padding: 8px 14px;
  border-radius: var(--radius);
  transition: all var(--transition);
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--white);
  background: rgba(255,255,255,0.12);
}

.nav-links .nav-cta a {
  background: var(--blue);
  color: var(--white);
  padding: 8px 18px;
}
.nav-links .nav-cta a:hover {
  background: #1f5a9e;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 6px;
}
.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--white);
  border-radius: 2px;
  transition: all var(--transition);
}

/* ── Footer ── */
.site-footer {
  background: var(--navy-dark);
  color: rgba(255,255,255,0.75);
  padding: 64px 0 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 48px;
  padding-bottom: 48px;
}

.footer-brand .nav-logo { margin-bottom: 16px; }

.footer-brand p {
  color: rgba(255,255,255,0.6);
  font-size: 0.9rem;
  line-height: 1.6;
}

.footer-col h4 {
  color: var(--white);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 16px;
}

.footer-col ul { list-style: none; }
.footer-col ul li { margin-bottom: 10px; }
.footer-col ul li a {
  color: rgba(255,255,255,0.6);
  font-size: 0.9rem;
  transition: color var(--transition);
}
.footer-col ul li a:hover { color: var(--white); }

.footer-contact p {
  color: rgba(255,255,255,0.6);
  font-size: 0.9rem;
  margin-bottom: 10px;
  display: flex;
  align-items: flex-start;
  gap: 10px;
}
.footer-contact p .icon { flex-shrink: 0; margin-top: 2px; opacity: 0.7; }

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding: 20px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.82rem;
  color: rgba(255,255,255,0.4);
}

.footer-bottom a { color: rgba(255,255,255,0.5); }
.footer-bottom a:hover { color: var(--white); }

/* ── Hero ── */
.hero {
  background: linear-gradient(135deg, var(--navy-dark) 0%, var(--navy) 55%, var(--navy-mid) 100%);
  color: var(--white);
  padding: 100px 0 90px;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.025'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}

.hero-inner {
  position: relative;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}

.hero-label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(255,255,255,0.1);
  border: 1px solid rgba(255,255,255,0.2);
  padding: 6px 14px;
  border-radius: 100px;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.9);
  margin-bottom: 24px;
}
.hero-label .dot {
  width: 7px;
  height: 7px;
  background: #4ADE80;
  border-radius: 50%;
}

.hero-content h1 {
  color: var(--white);
  margin-bottom: 24px;
}
.hero-content h1 span { color: #7EB8F7; }

.hero-content .lead {
  color: rgba(255,255,255,0.8);
  margin-bottom: 36px;
  font-size: 1.1rem;
}

.hero-cta {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

.hero-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.hero-stat {
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.14);
  border-radius: 10px;
  padding: 24px;
  backdrop-filter: blur(4px);
}

.hero-stat .stat-num {
  font-size: 2.2rem;
  font-weight: 800;
  color: #fff;
  line-height: 1;
  margin-bottom: 6px;
}
.hero-stat .stat-num span { color: #7EB8F7; }

.hero-stat .stat-label {
  font-size: 0.85rem;
  color: rgba(255,255,255,0.65);
  line-height: 1.3;
}

/* ── Cert Banner ── */
.cert-banner {
  background: var(--blue);
  color: var(--white);
  padding: 20px 0;
}

.cert-banner-inner {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 24px;
  flex-wrap: wrap;
  text-align: center;
}

.cert-banner .cert-badge {
  display: flex;
  align-items: center;
  gap: 12px;
  background: rgba(255,255,255,0.12);
  padding: 10px 20px;
  border-radius: 6px;
}

.cert-badge .badge-icon {
  font-size: 1.5rem;
}

.cert-badge .badge-text strong {
  display: block;
  font-size: 1rem;
  font-weight: 800;
}
.cert-badge .badge-text span {
  font-size: 0.78rem;
  opacity: 0.85;
}

/* ── Cards ── */
.card {
  background: var(--white);
  border-radius: 10px;
  box-shadow: var(--shadow);
  padding: 36px 32px;
  border: 1px solid var(--gray-light);
  transition: transform var(--transition), box-shadow var(--transition);
}

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

.card-icon {
  width: 52px;
  height: 52px;
  border-radius: 10px;
  background: var(--off-white);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 20px;
}

.card-icon.navy { background: var(--navy); }
.card-icon.blue { background: var(--blue); }

.card h3 { margin-bottom: 10px; font-size: 1.15rem; }

/* ── Grid Layouts ── */
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 32px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }

/* ── Feature List ── */
.feature-list { list-style: none; }
.feature-list li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 10px 0;
  border-bottom: 1px solid var(--gray-light);
  color: var(--text-light);
  font-size: 0.95rem;
}
.feature-list li:last-child { border-bottom: none; }
.feature-list .check {
  color: var(--blue);
  font-weight: 700;
  flex-shrink: 0;
  margin-top: 1px;
}

/* ── CTA Section ── */
.cta-section {
  background: linear-gradient(135deg, var(--navy) 0%, var(--navy-mid) 100%);
  color: var(--white);
  text-align: center;
  padding: 80px 0;
}

.cta-section h2 { color: var(--white); margin-bottom: 16px; }
.cta-section p { color: rgba(255,255,255,0.78); font-size: 1.05rem; margin-bottom: 36px; }

.cta-buttons { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }

/* ── Page Hero (inner pages) ── */
.page-hero {
  background: linear-gradient(135deg, var(--navy-dark) 0%, var(--navy) 100%);
  color: var(--white);
  padding: 70px 0 60px;
}

.page-hero .breadcrumb {
  font-size: 0.82rem;
  color: rgba(255,255,255,0.5);
  margin-bottom: 16px;
}
.page-hero .breadcrumb a { color: rgba(255,255,255,0.6); }
.page-hero .breadcrumb a:hover { color: #fff; }
.page-hero .breadcrumb span { margin: 0 8px; }

.page-hero h1 { color: var(--white); margin-bottom: 16px; }
.page-hero p { color: rgba(255,255,255,0.78); font-size: 1.1rem; max-width: 600px; }

/* ── Highlight Box ── */
.highlight-box {
  background: var(--off-white);
  border-left: 4px solid var(--blue);
  border-radius: 0 var(--radius) var(--radius) 0;
  padding: 24px 28px;
  margin: 28px 0;
}
.highlight-box p { color: var(--text); margin: 0; }

/* ── Split Section ── */
.split-section {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}

.split-section.reverse { direction: rtl; }
.split-section.reverse > * { direction: ltr; }

.split-visual {
  background: linear-gradient(135deg, var(--navy) 0%, var(--navy-mid) 100%);
  border-radius: 12px;
  min-height: 360px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.split-visual-inner {
  text-align: center;
  color: white;
  padding: 40px;
}
.split-visual-inner .big-num {
  font-size: 5rem;
  font-weight: 900;
  line-height: 1;
  opacity: 0.15;
  position: absolute;
  bottom: -10px;
  right: 20px;
}

/* ── Contact Form ── */
.contact-form {
  background: var(--white);
  border-radius: 12px;
  box-shadow: var(--shadow-lg);
  padding: 48px 44px;
  border: 1px solid var(--gray-light);
}

.form-group { margin-bottom: 20px; }

.form-group label {
  display: block;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--navy);
  margin-bottom: 6px;
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 12px 16px;
  border: 1.5px solid var(--gray-light);
  border-radius: var(--radius);
  font-size: 0.95rem;
  color: var(--text);
  background: #fff;
  transition: border-color var(--transition), box-shadow var(--transition);
  font-family: inherit;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--blue);
  box-shadow: 0 0 0 3px rgba(46,109,180,0.12);
}

.form-group textarea { resize: vertical; min-height: 130px; }

.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }

/* ── Divider ── */
.divider {
  width: 60px;
  height: 4px;
  background: var(--blue);
  border-radius: 2px;
  margin: 16px 0 24px;
}
.divider.centered { margin: 16px auto 24px; }

/* ── Stat Row ── */
.stat-row {
  display: flex;
  gap: 48px;
  flex-wrap: wrap;
}

.stat-item .num {
  font-size: 2.6rem;
  font-weight: 800;
  color: var(--navy);
  line-height: 1;
}
.stat-item .num span { color: var(--blue); }
.stat-item .label {
  font-size: 0.88rem;
  color: var(--gray);
  margin-top: 4px;
}

/* ── Certification Card ── */
.cert-card {
  background: var(--navy);
  color: var(--white);
  border-radius: 12px;
  padding: 40px;
  text-align: center;
}
.cert-card .cert-code {
  font-size: 3.5rem;
  font-weight: 900;
  color: #7EB8F7;
  letter-spacing: -0.02em;
  line-height: 1;
  margin-bottom: 8px;
}
.cert-card .cert-name {
  font-size: 0.9rem;
  opacity: 0.7;
  margin-bottom: 20px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}
.cert-card p { color: rgba(255,255,255,0.75); font-size: 0.9rem; }

/* ── Products page ── */
.product-block {
  padding: 56px 0;
  border-bottom: 1px solid var(--gray-light);
}
.product-block:last-child { border-bottom: none; }

.product-block-inner {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 56px;
  align-items: start;
}
.product-block-inner.full-width {
  grid-template-columns: 1fr;
}

.product-label-col h2 {
  font-size: clamp(1.2rem, 2.5vw, 1.6rem);
  color: var(--navy);
  position: sticky;
  top: 100px;
}

.product-copy h4 {
  color: var(--navy);
  font-size: 1rem;
  margin: 24px 0 8px;
}
.product-copy h4:first-child { margin-top: 0; }

.window-types {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 12px 0;
}
.window-type {
  background: var(--off-white);
  border: 1px solid var(--gray-light);
  color: var(--navy);
  font-size: 0.82rem;
  font-weight: 600;
  padding: 5px 12px;
  border-radius: 100px;
  letter-spacing: 0.02em;
}

.stock-custom-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
}

.dividing-rule {
  border: none;
  border-top: 1px solid var(--gray-light);
  margin: 20px 0 28px;
}

/* ── Responsive ── */
@media (max-width: 1024px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .hero-inner { gap: 40px; }
}

@media (max-width: 768px) {
  section { padding: 48px 0; }
  .container { padding: 0 20px; }

  /* Nav */
  .nav-links {
    display: none;
    flex-direction: column;
    position: absolute;
    top: 72px;
    left: 0; right: 0;
    background: var(--navy-dark);
    padding: 12px 16px 20px;
    gap: 2px;
    z-index: 99;
    box-shadow: 0 8px 24px rgba(0,0,0,0.3);
  }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 12px 16px; font-size: 1rem; }
  .nav-toggle { display: flex; }

  /* Logo: scale down on mobile */
  .nav-logo .logo-mark-img { height: 44px; }
  .nav-inner { height: 72px; }

  /* Hero */
  .hero { padding: 56px 0; }
  .hero-inner { grid-template-columns: 1fr; gap: 36px; }
  .hero-stats { grid-template-columns: 1fr 1fr; }

  /* Grids */
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr; }
  .split-section { grid-template-columns: 1fr; gap: 36px; }
  .split-section.reverse { direction: ltr; }
  .footer-grid { grid-template-columns: 1fr; gap: 28px; }
  .footer-bottom { flex-direction: column; gap: 8px; text-align: center; }
  .stat-row { gap: 24px; }

  /* Contact form */
  .contact-form { padding: 28px 20px; }

  /* Contact page layout */
  .contact-layout {
    grid-template-columns: 1fr !important;
  }

  /* About stats */
  .stats-four-col {
    grid-template-columns: 1fr 1fr !important;
    gap: 28px !important;
  }

  /* Certifications hero: hide backdrop logo on mobile */
  .cert-hero-backdrop { display: none !important; }

  /* Page hero */
  .page-hero { padding: 48px 0 40px; }
  .page-hero h1 { font-size: clamp(1.6rem, 6vw, 2.4rem); }
  .page-hero p { font-size: 1rem; }

  /* Products */
  .product-block-inner {
    grid-template-columns: 1fr !important;
    gap: 20px !important;
  }
  .product-label-col h2 { position: static; }
  .stock-custom-grid { grid-template-columns: 1fr !important; gap: 28px !important; }

  /* Buttons — ensure tap-friendly */
  .btn { padding: 14px 24px; min-height: 48px; }
  .cta-buttons { flex-direction: column; align-items: center; }

  /* Fix inline fixed-width grids */
  .products-snapshot-grid { grid-template-columns: 1fr !important; gap: 40px !important; }

  /* Better banner height on mobile */
  .hero { min-height: 480px; }
  .page-hero { min-height: 220px; padding: 56px 0 48px; }
}

@media (max-width: 480px) {
  section { padding: 40px 0; }
  .container { padding: 0 16px; }

  .hero-stats { grid-template-columns: 1fr; }
  .hero-cta { flex-direction: column; }
  .cert-banner-inner { flex-direction: column; }
  .stats-four-col { grid-template-columns: 1fr !important; }

  /* Footer logo area */
  .footer-brand .nav-logo .logo-mark-img { height: 38px; }

  /* CTA section */
  .cta-section { padding: 60px 0; }
  .cta-section p { font-size: 1rem; }
}