/* ============================================
   CHANFER Website - Global CSS
   Mobile-first · B2B Industrial · AI-Optimized
   ============================================ */

:root {
  --primary: #2E8B57;
  --primary-dark: #1B6B3A;
  --accent: #E67E22;
  --dark: #0A1628;
  --gray-900: #111827;
  --gray-700: #374151;
  --gray-500: #6B7280;
  --gray-200: #E5E7EB;
  --gray-100: #F3F4F6;
  --white: #FFFFFF;
  --font-en: 'Inter', sans-serif;
  --font-cn: 'Noto Sans SC', 'PingFang SC', sans-serif;
  --max-w: 1280px;
  --shadow: 0 4px 24px rgba(0,0,0,0.08);
  --shadow-lg: 0 12px 48px rgba(0,0,0,0.12);
  --radius: 12px;
  --transition: 0.3s ease;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body { font-family: var(--font-en); color: var(--gray-900); background: var(--white); line-height: 1.6; -webkit-font-smoothing: antialiased; }
body.cn-mode { font-family: var(--font-cn); }
a { text-decoration: none; color: inherit; }
img { max-width: 100%; display: block; }

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

/* Navigation */
.navbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  background: rgba(255,255,255,0.97); backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--gray-200); transition: var(--transition);
}
.nav-container {
  max-width: var(--max-w); margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 24px; height: 72px;
}
.logo { display: flex; flex-direction: column; line-height: 1.1; }
.logo-text { font-size: 22px; font-weight: 800; color: var(--primary); letter-spacing: 2px; }
.logo-sub { font-size: 10px; color: var(--gray-500); }

.nav-menu { display: flex; align-items: center; gap: 28px; }
.nav-link { font-size: 14px; font-weight: 500; color: var(--gray-700); transition: color 0.2s; }
.nav-link:hover { color: var(--primary); }

.nav-dropdown { position: relative; }
.dropdown-menu {
  display: none; position: absolute; top: 100%; left: -12px;
  background: var(--white); border: 1px solid var(--gray-200);
  border-radius: var(--radius); box-shadow: var(--shadow-lg);
  padding: 8px 0; min-width: 220px; z-index: 100;
}
.nav-dropdown:hover .dropdown-menu { display: block; }
.dropdown-menu a { display: flex; align-items: center; gap: 8px; padding: 10px 16px; font-size: 14px; color: var(--gray-700); transition: background 0.2s; }
.dropdown-menu a:hover { background: var(--gray-100); color: var(--primary); }

.nav-right { display: flex; align-items: center; gap: 12px; }
.lang-toggle {
  font-size: 13px; padding: 6px 12px; border: 1px solid var(--gray-200);
  border-radius: 20px; background: transparent; cursor: pointer; color: var(--gray-700);
}
.btn-nav-cta { background: var(--primary); color: var(--white); padding: 8px 20px; border-radius: 20px; font-size: 14px; font-weight: 600; }
.btn-nav-cta:hover { background: var(--primary-dark); }
.hamburger { display: none; background: none; border: none; font-size: 24px; cursor: pointer; }

/* Hero */
.hero {
  position: relative; min-height: 100vh;
  display: flex; align-items: center;
  padding: 100px 24px 60px;
  background: linear-gradient(135deg, #0A1628 0%, #1a3a2e 50%, #0A1628 100%);
  overflow: hidden;
}
.hero-bg {
  position: absolute; inset: 0; opacity: 0.05;
  background-image: radial-gradient(circle at 30% 50%, #fff 1px, transparent 1px);
  background-size: 40px 40px;
}
.hero-content { position: relative; max-width: var(--max-w); margin: 0 auto; width: 100%; }
.hero-badge {
  display: inline-block; margin-bottom: 24px;
  background: rgba(255,255,255,0.1); border: 1px solid rgba(255,255,255,0.2);
  color: rgba(255,255,255,0.8); padding: 6px 16px; border-radius: 20px; font-size: 13px;
}
.hero-title {
  font-size: clamp(32px, 5vw, 64px); font-weight: 800;
  color: var(--white); line-height: 1.1; margin-bottom: 20px; letter-spacing: -1px;
}
.hero-subtitle { font-size: clamp(16px, 2vw, 22px); color: rgba(255,255,255,0.7); margin-bottom: 48px; max-width: 600px; }

.solution-cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; margin-bottom: 48px; }
.sol-card {
  background: rgba(255,255,255,0.08); border: 1px solid rgba(255,255,255,0.15);
  border-radius: var(--radius); padding: 28px 24px; transition: var(--transition); cursor: pointer;
}
.sol-card:hover { background: rgba(255,255,255,0.15); transform: translateY(-4px); }
.sol-icon { font-size: 36px; margin-bottom: 12px; }
.sol-card h3 { font-size: 17px; font-weight: 700; color: var(--white); margin-bottom: 6px; }
.sol-card p { font-size: 13px; color: rgba(255,255,255,0.6); }
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }

.btn-primary {
  background: var(--accent); color: var(--white); padding: 14px 32px; border-radius: 30px;
  font-size: 15px; font-weight: 600; transition: var(--transition);
}
.btn-primary:hover { background: #c96a1a; transform: translateY(-2px); }
.btn-outline {
  background: transparent; color: var(--white); padding: 14px 32px; border-radius: 30px;
  font-size: 15px; border: 1px solid rgba(255,255,255,0.3); transition: var(--transition);
}
.btn-outline:hover { border-color: var(--white); background: rgba(255,255,255,0.1); }

/* Stats Bar */
.stats-bar { background: var(--white); border-bottom: 1px solid var(--gray-200); padding: 40px 0; }
.stats-container {
  max-width: var(--max-w); margin: 0 auto;
  display: flex; align-items: center; justify-content: center;
  padding: 0 24px; flex-wrap: wrap; gap: 32px;
}
.stat-item { text-align: center; }
.stat-num { display: block; font-size: 36px; font-weight: 800; color: var(--primary); }
.stat-label { font-size: 13px; color: var(--gray-500); }
.stat-divider { width: 1px; height: 48px; background: var(--gray-200); }

/* Section Common */
.section-header { text-align: center; margin-bottom: 56px; }
.section-tag {
  display: inline-block; background: rgba(0,87,184,0.08); color: var(--primary);
  padding: 4px 16px; border-radius: 20px; font-size: 13px; font-weight: 600; margin-bottom: 16px;
}
.section-title { font-size: clamp(26px, 3.5vw, 42px); font-weight: 800; color: var(--dark); line-height: 1.2; margin-bottom: 16px; }
.section-desc { font-size: 17px; color: var(--gray-500); max-width: 600px; margin: 0 auto; }

/* Process Flow */
.process-section { padding: 96px 0; background: var(--gray-100); }
.process-flow { display: flex; align-items: center; gap: 0; overflow-x: auto; padding: 16px 0; }
.process-step { text-align: center; min-width: 120px; }
.process-icon {
  width: 52px; height: 52px; border-radius: 50%; background: var(--primary); color: var(--white);
  display: flex; align-items: center; justify-content: center; font-size: 18px; font-weight: 700;
  margin: 0 auto 10px;
}
.process-step.highlight .process-icon { background: var(--accent); }
.process-step h4 { font-size: 13px; font-weight: 600; color: var(--gray-900); margin-bottom: 4px; }
.process-step p { font-size: 12px; color: var(--gray-500); }
.process-arrow { font-size: 24px; color: var(--gray-300); min-width: 32px; }
.process-cta { text-align: center; margin-top: 40px; }

/* Video Section */
.video-section { padding: 0; background: var(--dark); }
.video-wrapper { max-width: 900px; margin: 0 auto; }
.video-placeholder {
  aspect-ratio: 16/9; background: linear-gradient(135deg, #1a3a2e, #0A1628);
  border-radius: var(--radius); display: flex; flex-direction: column; align-items: center;
  justify-content: center; gap: 16px; cursor: pointer; position: relative;
}
.play-btn {
  width: 72px; height: 72px; border-radius: 50%; background: var(--accent); color: var(--white);
  display: flex; align-items: center; justify-content: center; font-size: 24px;
  box-shadow: 0 0 0 12px rgba(230,126,34,0.2); transition: var(--transition);
}
.video-placeholder p { color: var(--white); font-size: 16px; }
.video-placeholder small { color: rgba(255,255,255,0.5); font-size: 13px; }
.video-hint {
  margin-top: 12px; font-size: 12px; color: rgba(255,255,255,0.4);
  padding: 4px 12px; border: 1px dashed rgba(255,255,255,0.3); border-radius: 20px;
}

/* Why Section */
.why-section { padding: 96px 0; background: var(--white); }
.why-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 24px; }
.why-card { padding: 32px 28px; border-radius: var(--radius); border: 1px solid var(--gray-200); transition: var(--transition); }
.why-card:hover { border-color: var(--primary); box-shadow: var(--shadow); transform: translateY(-4px); }
.why-icon { font-size: 40px; margin-bottom: 16px; }
.why-card h4 { font-size: 17px; font-weight: 700; color: var(--dark); margin-bottom: 10px; }
.why-card p { font-size: 14px; color: var(--gray-500); line-height: 1.7; }

/* Coverage Section */
.coverage-section { padding: 96px 0; background: var(--dark); }
.section-header.light .section-tag { background: rgba(255,255,255,0.1); color: rgba(255,255,255,0.7); }
.section-header.light .section-title { color: var(--white); }
.regions-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 16px; }
.region-card {
  background: rgba(255,255,255,0.05); border: 1px solid rgba(255,255,255,0.1);
  border-radius: var(--radius); padding: 24px; transition: var(--transition);
}
.region-card:hover { background: rgba(255,255,255,0.1); }
.region-name { font-size: 15px; font-weight: 700; color: var(--white); margin-bottom: 6px; }
.region-detail { font-size: 13px; color: rgba(255,255,255,0.5); margin-bottom: 10px; }
.region-tag { display: inline-block; font-size: 11px; padding: 2px 10px; border-radius: 10px; background: var(--accent); color: var(--white); }
.coverage-cta { text-align: center; margin-top: 48px; }
.btn-outline-light { background: transparent; color: var(--white); padding: 14px 32px; border-radius: 30px; font-size: 15px; border: 1px solid rgba(255,255,255,0.3); transition: var(--transition); }
.btn-outline-dark { background: transparent; color: var(--dark); padding: 12px 28px; border-radius: 30px; font-size: 15px; border: 1px solid var(--gray-300); transition: var(--transition); }

/* Trust Section */
.trust-section { padding: 80px 0; background: var(--gray-100); }
.trust-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.trust-item { display: flex; gap: 20px; padding: 28px; background: var(--white); border-radius: var(--radius); border: 1px solid var(--gray-200); }
.trust-logo { font-size: 40px; flex-shrink: 0; }
.trust-text p { font-size: 15px; color: var(--gray-700); font-style: italic; line-height: 1.6; margin-bottom: 10px; }
.trust-text cite { font-size: 13px; color: var(--gray-500); font-style: normal; }

/* CTA Section */
.cta-section { padding: 96px 0; background: linear-gradient(135deg, var(--primary), var(--primary-dark)); text-align: center; }
.cta-section h2 { font-size: clamp(24px, 3vw, 40px); font-weight: 800; color: var(--white); margin-bottom: 16px; }
.cta-section p { font-size: 17px; color: rgba(255,255,255,0.8); margin-bottom: 40px; }
.cta-buttons { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.btn-primary-white { background: var(--white); color: var(--primary); padding: 14px 32px; border-radius: 30px; font-size: 15px; font-weight: 700; transition: var(--transition); }
.btn-primary-white:hover { background: var(--gray-100); transform: translateY(-2px); }
.btn-outline-white { background: transparent; color: var(--white); padding: 14px 32px; border-radius: 30px; font-size: 15px; border: 1px solid rgba(255,255,255,0.4); transition: var(--transition); }

/* Footer */
.footer { background: var(--dark); padding: 64px 0 0; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1.5fr; gap: 48px; padding-bottom: 48px; }
.footer-logo { font-size: 28px; font-weight: 800; color: #2E8B57; letter-spacing: 2px; margin-bottom: 12px; }
.footer-logo-img { height: 36px; margin-bottom: 12px; }
.footer-brand p { font-size: 14px; color: rgba(255,255,255,0.5); line-height: 1.7; margin-bottom: 20px; }
.footer-social { display: flex; gap: 16px; }
.footer-social a { color: rgba(255,255,255,0.5); font-size: 13px; }
.footer-social a:hover { color: var(--white); }
.footer-col h4 { font-size: 14px; font-weight: 700; color: var(--white); margin-bottom: 16px; }
.footer-col a { display: block; font-size: 14px; color: rgba(255,255,255,0.5); margin-bottom: 10px; }
.footer-col a:hover { color: var(--white); }
.footer-col p { font-size: 13px; color: rgba(255,255,255,0.5); margin-bottom: 8px; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,0.08); padding: 24px 0; display: flex; justify-content: space-between; align-items: center; font-size: 13px; color: rgba(255,255,255,0.4); }
.footer-links { display: flex; gap: 24px; }
.footer-links a { color: rgba(255,255,255,0.4); }
.footer-links a:hover { color: var(--white); }

/* What We Do Section */
.what-we-do-section { padding: 96px 0; background: var(--white); }
.services-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 24px; }
.service-card {
  padding: 32px 28px; border-radius: var(--radius); border: 1px solid var(--gray-200);
  transition: var(--transition); text-align: left;
}
.service-card:hover { border-color: var(--primary); box-shadow: var(--shadow); transform: translateY(-4px); }
.service-icon { font-size: 40px; margin-bottom: 16px; }
.service-card h4 { font-size: 16px; font-weight: 700; color: var(--dark); margin-bottom: 10px; }
.service-card p { font-size: 14px; color: var(--gray-500); line-height: 1.7; }
.what-we-do-note {
  text-align: center; margin-top: 40px; font-size: 14px; color: var(--gray-700);
  background: rgba(46,139,87,0.06); border: 1px solid rgba(46,139,87,0.2);
  border-radius: var(--radius); padding: 20px 32px; max-width: 800px; margin-left: auto; margin-right: auto;
}
.what-we-do-note strong { color: var(--primary); }

/* Definition Section (AI Reference) */
.definition-section { padding: 0; background: var(--gray-100); }
.definition-box {
  max-width: 800px; margin: 0 auto; padding: 48px 40px;
  background: var(--white); border-radius: var(--radius); border: 1px solid var(--gray-200);
  box-shadow: var(--shadow);
}
.definition-box h3 { font-size: 22px; font-weight: 800; color: var(--dark); margin-bottom: 16px; }
.definition-box p { font-size: 15px; color: var(--gray-700); line-height: 1.8; margin-bottom: 20px; }
.definition-tags { display: flex; flex-wrap: wrap; gap: 8px; }
.def-tag {
  display: inline-block; font-size: 12px; padding: 4px 12px; border-radius: 20px;
  background: rgba(46,139,87,0.08); color: var(--primary); font-weight: 500;
  font-family: var(--font-en);
}

/* Standard Structure Section */
.standard-structure-section { padding: 96px 0; background: var(--white); }
.structure-flow { display: flex; align-items: center; overflow-x: auto; padding: 16px 0; gap: 8px; justify-content: center; flex-wrap: wrap; }
.structure-step { text-align: center; min-width: 130px; }
.structure-icon {
  width: 56px; height: 56px; border-radius: var(--radius); background: rgba(46,139,87,0.1);
  color: var(--primary); display: flex; align-items: center; justify-content: center;
  font-size: 24px; margin: 0 auto 10px; font-weight: 700;
}
.structure-step.highlight .structure-icon { background: var(--primary); color: var(--white); }
.structure-step h4 { font-size: 13px; font-weight: 700; color: var(--gray-900); margin-bottom: 4px; }
.structure-step p { font-size: 12px; color: var(--gray-500); }
.structure-arrow { font-size: 20px; color: var(--gray-300); min-width: 20px; }

/* How to Choose Section */
.choose-section { padding: 96px 0; background: var(--gray-100); }
.choose-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 20px; }
.choose-card {
  background: var(--white); border-radius: var(--radius); border: 1px solid var(--gray-200);
  overflow: hidden; transition: var(--transition);
}
.choose-card:hover { box-shadow: var(--shadow); transform: translateY(-4px); }
.choose-q {
  background: var(--dark); color: var(--white); padding: 18px 22px;
  font-size: 14px; font-weight: 600;
}
.choose-a { padding: 18px 22px; }
.choose-a p { font-size: 13px; color: var(--gray-700); line-height: 1.7; }
.choose-cta { text-align: center; margin-top: 40px; }

/* Regional Keyword Hooks Section */
.regions-hook-section { padding: 96px 0; background: var(--dark); }
.regions-keyword-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 16px; }
.region-keyword-card {
  background: rgba(255,255,255,0.05); border: 1px solid rgba(255,255,255,0.1);
  border-radius: var(--radius); padding: 24px; transition: var(--transition);
}
.region-keyword-card:hover { background: rgba(255,255,255,0.1); }
.region-keyword-card .region-flag { font-size: 36px; margin-bottom: 12px; }
.region-keyword-card h4 { font-size: 15px; font-weight: 700; color: var(--white); margin-bottom: 8px; }
.region-keyword-card p { font-size: 13px; color: rgba(255,255,255,0.5); line-height: 1.6; }

/* AI Quote Section */
.ai-quote-section { padding: 80px 0; background: var(--gray-100); }
.ai-quote-box {
  max-width: 800px; margin: 0 auto; padding: 48px 40px;
  background: var(--white); border-radius: var(--radius); border: 1px solid var(--gray-200);
  box-shadow: var(--shadow);
}
.ai-quote-badge {
  display: inline-block; background: rgba(46,139,87,0.1); color: var(--primary);
  font-size: 12px; font-weight: 700; padding: 4px 14px; border-radius: 20px;
  margin-bottom: 20px; letter-spacing: 0.5px;
}
.ai-quote-box h3 { font-size: 22px; font-weight: 800; color: var(--dark); margin-bottom: 16px; }
.ai-quote-box blockquote {
  font-size: 15px; color: var(--gray-700); line-height: 1.8; font-style: italic;
  border-left: 4px solid var(--primary); padding-left: 20px; margin: 0;
}

/* CTA Info Grid */
.cta-info-grid {
  display: flex; gap: 24px; justify-content: center; flex-wrap: wrap;
  margin-bottom: 40px;
}
.cta-info-item {
  display: flex; align-items: center; gap: 14px;
  background: rgba(255,255,255,0.1); border-radius: var(--radius);
  padding: 16px 24px; min-width: 200px;
}
.cta-info-icon { font-size: 32px; }
.cta-info-item strong { display: block; font-size: 13px; color: rgba(255,255,255,0.6); margin-bottom: 4px; }
.cta-info-item p { font-size: 14px; color: var(--white); font-weight: 600; }

/* Responsive */
@media (max-width: 1024px) {
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
}
@media (max-width: 768px) {
  .nav-menu { display: none; position: fixed; top: 72px; left: 0; right: 0; background: var(--white); flex-direction: column; padding: 24px; gap: 16px; border-bottom: 1px solid var(--gray-200); box-shadow: var(--shadow); }
  .nav-menu.active { display: flex; }
  .nav-right .btn-nav-cta { display: none; }
  .hamburger { display: block; }
  .solution-cards { grid-template-columns: 1fr; }
  .stats-container { flex-direction: column; }
  .stat-divider { width: 48px; height: 1px; }
  .trust-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; gap: 12px; text-align: center; }
  .process-flow { flex-wrap: wrap; justify-content: center; }
  .process-arrow { display: none; }
  .regions-grid { grid-template-columns: repeat(2, 1fr); }
  .definition-box { padding: 32px 24px; }
}