/* =============================================
   Huapu New Energy - Foreign Trade Website
   Single-page layout per design doc
   ============================================= */

:root {
  --primary: #1a7a4c;
  --primary-dark: #145a38;
  --primary-light: #2ecc71;
  --accent: #f39c12;
  --accent-dark: #e67e22;
  --dark: #1a2332;
  --dark-soft: #2c3e50;
  --white: #ffffff;
  --gray-50: #f8faf9;
  --gray-100: #f0f4f2;
  --gray-200: #e2e8e5;
  --gray-400: #94a3a8;
  --gray-600: #64748b;
  --gray-800: #334155;
  --text: #2d3748;
  --shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 12px 40px rgba(26, 122, 76, 0.15);
  --radius: 8px;
  --radius-lg: 16px;
  --transition: 0.3s ease;
  --nav-h: 72px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: var(--nav-h); }
body {
  font-family: 'Segoe UI', -apple-system, BlinkMacSystemFont, 'Helvetica Neue', Arial, sans-serif;
  color: var(--text);
  background: var(--white);
  line-height: 1.7;
  font-size: 15px;
}
a { text-decoration: none; color: inherit; transition: color var(--transition); }
img { max-width: 100%; height: auto; display: block; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }

/* TOP BAR */
.top-bar {
  background: var(--dark);
  color: rgba(255,255,255,0.85);
  font-size: 13px;
  padding: 8px 0;
}
.top-bar-inner { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 12px; }
.top-bar a { color: rgba(255,255,255,0.85); }
.top-bar a:hover { color: var(--primary-light); }
.top-bar-left, .top-bar-right { display: flex; align-items: center; gap: 24px; flex-wrap: wrap; }
.top-bar-item { display: flex; align-items: center; gap: 6px; }

/* NAVBAR */
.navbar {
  background: var(--white);
  box-shadow: 0 2px 12px rgba(0,0,0,0.06);
  position: sticky;
  top: 0;
  z-index: 1000;
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 20px;
  max-width: 1200px;
  margin: 0 auto;
  gap: 16px;
  min-height: var(--nav-h);
}
.nav-logo {
  display: flex;
  align-items: center;
  flex-shrink: 0;
  background: transparent;
  padding: 0;
  border-radius: 0;
}
/* 白字黑底 Logo → 蓝字白底 */
.nav-logo img {
  height: 40px;
  width: auto;
  display: block;
  object-fit: contain;
  filter: invert(1) brightness(0) saturate(100%) invert(36%) sepia(98%) saturate(1500%) hue-rotate(186deg) brightness(98%) contrast(101%);
}
.nav-menu { display: flex; list-style: none; gap: 0; align-items: center; flex-wrap: wrap; }
.nav-menu a {
  display: block;
  padding: 8px 10px;
  font-size: 13px;
  font-weight: 600;
  color: var(--gray-800);
  border-radius: var(--radius);
}
.nav-menu a:hover, .nav-menu a.active {
  color: var(--primary);
  background: rgba(26,122,76,0.08);
}
.nav-toggle { display: none; flex-direction: column; gap: 5px; cursor: pointer; padding: 8px; }
.nav-toggle span { width: 24px; height: 2px; background: var(--dark); }

/* HERO + QUOTE FORM — banner 1920×772 */
.hero-section {
  position: relative;
  width: 100%;
  aspect-ratio: 1920 / 772;
  min-height: 420px;
  background: var(--dark);
  overflow: hidden;
}
.hero-slider { position: absolute; inset: 0; }
.hero-slide {
  position: absolute;
  inset: 0;
  opacity: 0;
  visibility: hidden;
  z-index: 0;
  transition: opacity 1s ease;
  background-size: cover;
  background-repeat: no-repeat;
  background-position: center center;
  background-color: var(--dark);
}
.hero-slide.active { opacity: 1; visibility: visible; z-index: 1; }
.hero-slide::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(to left, rgba(26, 35, 50, 0.45) 0%, rgba(26, 35, 50, 0.12) 30%, transparent 48%);
  pointer-events: none;
}
.hero-layout {
  position: relative;
  z-index: 2;
  display: flex;
  justify-content: flex-end;
  align-items: flex-start;
  min-height: 100%;
  padding: 64px 20px 40px;
  max-width: 1200px;
  margin: 0 auto;
}
.hero-dots { position: absolute; bottom: 20px; left: 50%; transform: translateX(-50%); display: flex; gap: 10px; z-index: 3; }
.hero-dot {
  width: 10px; height: 10px; border-radius: 50%;
  background: rgba(255,255,255,0.4); border: none; cursor: pointer;
}
.hero-dot.active { background: var(--accent); }

/* QUOTE FORM CARD */
.quote-card {
  background: white;
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: 0 20px 60px rgba(0,0,0,0.25);
}
.quote-card h2 {
  font-size: 20px;
  font-weight: 800;
  color: var(--dark);
  margin-bottom: 4px;
}
.quote-card .sub { font-size: 13px; color: var(--gray-600); margin-bottom: 20px; }
.quote-form .form-group { margin-bottom: 12px; }
.quote-form label {
  display: block;
  font-size: 12px;
  font-weight: 600;
  color: var(--gray-800);
  margin-bottom: 4px;
}
.quote-form .form-control {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  font-size: 13px;
  font-family: inherit;
}
.quote-form .form-control:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(26,122,76,0.1);
}
.quote-form .form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.btn-submit {
  width: 100%;
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
  color: white;
  padding: 12px;
  border: none;
  border-radius: var(--radius);
  font-size: 14px;
  font-weight: 700;
  cursor: pointer;
  margin-top: 4px;
  transition: var(--transition);
}
.btn-submit:hover { transform: translateY(-1px); box-shadow: 0 6px 20px rgba(243,156,18,0.4); }

/* VALUE CONCEPTS - 5 items */
.section { padding: 80px 0; }
.section-alt { background: var(--gray-50); }
.section-header { text-align: center; margin-bottom: 48px; }
.section-label {
  display: inline-block;
  font-size: 13px;
  font-weight: 700;
  color: var(--primary);
  text-transform: uppercase;
  letter-spacing: 2px;
  margin-bottom: 8px;
}
.section-title {
  font-size: clamp(26px, 4vw, 36px);
  font-weight: 800;
  color: var(--dark);
  margin-bottom: 12px;
}
.section-subtitle { font-size: 16px; color: var(--gray-600); max-width: 640px; margin: 0 auto; }

.values-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 24px;
}
.values-grid .value-item:nth-child(1) { grid-column: 1 / 3; }
.values-grid .value-item:nth-child(2) { grid-column: 3 / 5; }
.values-grid .value-item:nth-child(3) { grid-column: 5 / 7; }
.values-grid .value-item:nth-child(4) { grid-column: 2 / 4; }
.values-grid .value-item:nth-child(5) { grid-column: 4 / 6; }
.value-item {
  text-align: center;
  padding: 32px 20px;
  background: white;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  transition: var(--transition);
  border-top: 4px solid var(--primary);
}
.value-item:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.value-icon {
  width: 64px; height: 64px;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 28px;
  margin: 0 auto 16px;
  color: white;
}
.value-item h3 { font-size: 17px; font-weight: 800; color: var(--dark); margin-bottom: 10px; }
.value-item p { font-size: 14px; color: var(--gray-600); line-height: 1.7; }

/* ABOUT */
.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: center; }
.about-image { border-radius: var(--radius-lg); overflow: hidden; box-shadow: var(--shadow-lg); }
.about-image img { width: 100%; height: 380px; object-fit: cover; }
.about-content p { color: var(--gray-600); margin-bottom: 14px; line-height: 1.8; font-size: 15px; }
.about-tagline {
  margin-top: 20px;
  font-size: 18px;
  font-weight: 800;
  color: var(--primary);
  font-style: italic;
}

/* WHY CHOOSE US - image bg cards */
.why-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.why-card {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  min-height: 260px;
  display: flex;
  align-items: flex-end;
}
.why-card-bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  transition: transform 0.5s ease;
}
.why-card:hover .why-card-bg { transform: scale(1.05); }
.why-card-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(20,90,56,0.92) 0%, rgba(20,90,56,0.5) 50%, rgba(20,90,56,0.25) 100%);
}
.why-card-body {
  position: relative;
  z-index: 2;
  padding: 24px;
  color: white;
}
.why-card-body h3 { font-size: 18px; font-weight: 800; margin-bottom: 8px; }
.why-card-body p { font-size: 13px; line-height: 1.7; opacity: 0.9; }

/* PRODUCTS - image top, text bottom, 3 cols */
.products-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.product-cat {
  background: white;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: var(--transition);
}
.product-cat:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.product-cat-img {
  height: 260px;
  overflow: hidden;
  background: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 12px;
}
.product-cat-img img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  object-position: center;
}
.product-cat-body { padding: 20px; }
.product-cat-body h3 {
  font-size: 16px;
  font-weight: 800;
  color: var(--dark);
  margin-bottom: 12px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--primary);
}
.product-cat-body ul { list-style: none; }
.product-cat-body li {
  font-size: 13px;
  color: var(--gray-600);
  padding: 5px 0 5px 16px;
  position: relative;
}
.product-cat-body li::before {
  content: '•';
  position: absolute;
  left: 0;
  color: var(--primary);
  font-weight: 700;
}

/* WHO WE SERVE */
.serve-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}
.serve-item {
  background: white;
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: var(--shadow);
  border-left: 4px solid var(--primary);
  transition: var(--transition);
}
.serve-item:hover { box-shadow: var(--shadow-lg); transform: translateX(4px); }
.serve-item h3 { font-size: 18px; font-weight: 800; color: var(--dark); margin-bottom: 10px; }
.serve-item p { font-size: 14px; color: var(--gray-600); line-height: 1.7; }

/* CASES - 2 per row */
.cases-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}
.case-card {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  min-height: 220px;
  display: flex;
  align-items: flex-end;
}
.case-card-bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
}
.case-card-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(26,35,50,0.9) 0%, rgba(26,35,50,0.35) 100%);
}
.case-card-body { position: relative; z-index: 2; padding: 28px; color: white; }
.case-card-body h3 { font-size: 22px; font-weight: 800; margin-bottom: 8px; }
.case-card-body p { font-size: 14px; opacity: 0.9; line-height: 1.7; }

/* QUOTE SECTION (standalone) — 左右布局 */
.quote-section-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: center;
  margin-top: 8px;
}
.quote-section-grid .quote-benefits {
  padding-top: 8px;
}
.quote-benefits { list-style: none; }
.quote-benefits li {
  padding: 14px 0 14px 28px;
  position: relative;
  color: var(--gray-600);
  font-size: 15px;
  line-height: 1.5;
  border-bottom: 1px solid var(--gray-200);
}
.quote-benefits li:last-child {
  border-bottom: none;
}
.quote-benefits li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: var(--primary);
  font-weight: 700;
}
.quote-benefits-center {
  max-width: 640px;
  margin: 0 auto;
}
.quote-card-section {
  width: 100%;
  max-width: none;
  margin: 0;
  padding: 24px;
  box-shadow: var(--shadow-lg);
}
.quote-section-grid .quote-card-compact {
  max-width: none;
}

/* CONTACT */
.contact-roles {
  font-size: 15px;
  color: var(--gray-600);
  margin-top: -4px;
  letter-spacing: 0.02em;
}
.contact-region {
  font-size: 14px;
  font-weight: 700;
  color: var(--primary);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 16px;
}
.contact-region:not(:first-of-type) {
  margin-top: 32px;
}
.contact-banner-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
  margin-bottom: 8px;
}
.contact-banner {
  display: flex;
  align-items: flex-start;
  gap: 24px;
  padding: 28px 32px;
  background: #eef3f2;
  border-radius: 20px;
}
.contact-banner-main-icon {
  flex-shrink: 0;
  width: 72px;
  height: 72px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 48px;
  line-height: 1;
  opacity: 0.45;
  color: var(--gray-600);
}
.contact-banner-body {
  flex: 1;
  min-width: 0;
}
.contact-banner-top {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 28px 40px;
  margin-bottom: 22px;
}
.contact-banner-item {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 15px;
  color: var(--dark);
}
.contact-banner-item strong {
  font-size: 16px;
  font-weight: 700;
}
.contact-banner-item a {
  color: var(--dark);
  font-weight: 600;
  text-decoration: none;
}
.contact-banner-item a:hover {
  color: var(--primary);
}
.contact-banner-note {
  font-size: 14px;
  color: var(--gray-600);
  margin-left: 4px;
}
.contact-mini-icon {
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: white;
  border-radius: 50%;
  font-size: 18px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.06);
}
.contact-banner-bottom {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 4px;
}
.contact-banner-address {
  flex: 1;
  font-size: 14px;
  color: var(--gray-600);
  line-height: 1.5;
}
.contact-services {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 32px;
}
.contact-services-china {
  grid-template-columns: 1fr;
  max-width: 420px;
  margin-left: auto;
  margin-right: auto;
  margin-bottom: 0;
}
.service-item {
  background: white;
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: var(--shadow);
  text-align: center;
  transition: var(--transition);
  border-top: 4px solid var(--primary);
}
.service-item:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}
.service-item p:first-child {
  margin-top: 4px;
}
.service-item p {
  font-size: 14px;
  color: var(--gray-600);
  margin-bottom: 8px;
  line-height: 1.6;
}
.service-item p strong {
  color: var(--dark);
  font-size: 16px;
}
.service-item a {
  color: var(--primary);
  font-weight: 700;
  font-size: 16px;
}
.service-item a:hover { text-decoration: underline; }
.service-address {
  font-size: 13px !important;
  margin-top: 12px;
  opacity: 0.85;
}
.contact-info {
  display: flex;
  justify-content: center;
  gap: 48px;
  flex-wrap: wrap;
  padding: 32px;
  background: var(--gray-100);
  border-radius: var(--radius-lg);
}
.contact-item { display: flex; gap: 14px; max-width: 320px; }
.contact-icon {
  width: 44px; height: 44px;
  background: white;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 18px;
  flex-shrink: 0;
  box-shadow: var(--shadow);
}
.contact-item h4 { font-size: 13px; font-weight: 700; margin-bottom: 4px; color: var(--dark); }
.contact-item p, .contact-item a { font-size: 14px; color: var(--gray-600); }
.contact-item a { color: var(--primary); font-weight: 600; }
.contact-item a:hover { text-decoration: underline; }

/* FOOTER */
.footer {
  background: var(--dark);
  color: rgba(255,255,255,0.65);
  padding: 40px 0;
  text-align: center;
  font-size: 13px;
}
.footer-logo { height: 40px; margin: 0 auto 16px; }

/* FLOAT */
.float-contact {
  position: fixed;
  right: 20px;
  bottom: 24px;
  z-index: 999;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.float-btn {
  width: 50px; height: 50px;
  background: var(--primary);
  color: white;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 20px;
  box-shadow: var(--shadow-lg);
  transition: var(--transition);
  position: relative;
}
.float-btn:hover { background: var(--accent); transform: scale(1.08); }
.float-btn-tip {
  position: absolute;
  right: 58px;
  background: var(--dark);
  color: white;
  font-size: 11px;
  padding: 5px 10px;
  border-radius: var(--radius);
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: var(--transition);
}
.float-btn:hover .float-btn-tip { opacity: 1; }

/* ANIMATIONS */
.fade-up {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.fade-up.visible { opacity: 1; transform: translateY(0); }
.fade-up-delay-1 { transition-delay: 0.1s; }
.fade-up-delay-2 { transition-delay: 0.2s; }

/* CERTIFICATION SLIDER */
.certification-slider-wrapper {
  margin-top: 40px;
  overflow: hidden;
  position: relative;
}
.certification-slider {
  display: flex;
  gap: 24px;
  overflow-x: auto;
  scroll-behavior: smooth;
  padding: 20px 0;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}
.certification-slider::-webkit-scrollbar {
  display: none;
}
.certification-item {
  flex: 0 0 auto;
  width: 300px;
  background: white;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
  transition: transform var(--transition), box-shadow var(--transition);
}
.certification-item:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}
.certification-item img {
  width: 100%;
  height: auto;
  display: block;
}

/* COMPACT QUOTE CARD — 两列扁平布局 */
.quote-card-compact {
  width: 100%;
  max-width: 600px;
  padding: 22px 28px;
}
.quote-card-compact h2 {
  font-size: 20px;
  margin-bottom: 4px;
}
.quote-card-compact .sub {
  font-size: 12px;
  margin-bottom: 14px;
  line-height: 1.4;
}
.quote-card-compact .form-group {
  margin-bottom: 10px;
}
.quote-card-compact .form-row {
  margin-bottom: 0;
}
.quote-card-compact .form-row .form-group {
  margin-bottom: 10px;
}
.quote-card-compact .form-control {
  padding: 9px 12px;
  font-size: 13px;
}
.quote-card-compact textarea.form-control {
  min-height: 52px;
  resize: vertical;
}
.quote-card-compact .form-row-actions {
  margin-top: 4px;
  gap: 10px;
}
.quote-card-compact .form-row-actions .btn-submit,
.quote-card-compact .form-row-actions .btn-whatsapp {
  width: 100%;
  margin-top: 0;
  padding: 11px 10px;
  font-size: 13px;
  text-align: center;
  border-radius: var(--radius);
}
.quote-card-compact .btn-submit {
  margin-top: 0;
}
.btn-whatsapp {
  display: block;
  width: 100%;
  padding: 12px;
  margin-top: 0;
  background: #25D366;
  color: white;
  text-align: center;
  border-radius: var(--radius);
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  transition: var(--transition);
  box-sizing: border-box;
}
.btn-whatsapp:hover {
  background: #20BA5A;
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(37, 211, 102, 0.3);
}

/* RESPONSIVE */
@media (max-width: 1024px) {
  .hero-layout { min-height: auto; padding: 32px 20px 48px; justify-content: center; align-items: center; }
  .quote-card { max-width: 600px; width: 100%; }
  .hero-section { aspect-ratio: 1920 / 772; min-height: 360px; }
  .hero-slide { background-size: cover; background-position: center center; }
  .hero-slide::after {
    background: linear-gradient(to bottom, transparent 0%, rgba(26, 35, 50, 0.35) 100%);
  }
  .quote-section-grid { grid-template-columns: 1fr; gap: 32px; }
  .quote-card-section { max-width: 520px; margin: 0 auto; }
  .quote-section-grid .quote-card-compact { max-width: 520px; }
  .about-grid, .contact-services { grid-template-columns: 1fr; }
  .why-grid, .products-grid { grid-template-columns: repeat(2, 1fr); }
  .values-grid { grid-template-columns: repeat(2, 1fr); }
  .values-grid .value-item:nth-child(n) { grid-column: auto; }
  .certification-item { width: 250px; }
}

@media (max-width: 768px) {
  .nav-menu {
    display: none;
    position: absolute;
    top: 100%; left: 0; right: 0;
    background: white;
    flex-direction: column;
    padding: 16px;
    box-shadow: var(--shadow);
  }
  .nav-menu.open { display: flex; }
  .nav-toggle { display: flex; }
  .navbar { position: sticky; }
  .why-grid, .products-grid, .cases-grid, .serve-grid, .values-grid { grid-template-columns: 1fr; }
  .contact-banner { flex-direction: column; padding: 20px; gap: 16px; }
  .contact-banner-main-icon { width: 56px; height: 56px; font-size: 36px; }
  .contact-banner-top { flex-direction: column; align-items: flex-start; gap: 14px; }
  .contact-info { flex-direction: column; align-items: center; gap: 24px; }
  .quote-form .form-row { grid-template-columns: 1fr; }
  .certification-item { width: 220px; }
  .quote-card-compact { max-width: 100%; }
}