/* ============================================
   BANYAN TECH - 榕建智能 (Shenzhen) Co., Ltd.
   Modern Tech Corporate Website Stylesheet
   ============================================ */

/* --- CSS Reset & Variables --- */
:root {
  --primary: #1a0f0a;
  --primary-light: #2d1f1a;
  --secondary: #e8630c;
  --secondary-alt: #c85000;
  --accent-blue: #4a7cff;
  --accent-purple: #7c4dff;
  --text-primary: #f5ede5;
  --text-secondary: #b8a89c;
  --text-dark: #3d2b24;
  --text-body: #4a3d36;
  --bg-dark: #1a0f0a;
  --bg-section: #faf3ed;
  --bg-white: #ffffff;
  --gradient-tech: linear-gradient(135deg, #1a0f0a 0%, #3d1f12 30%, #5c2800 60%, #1a0f0a 100%);
  --gradient-accent: linear-gradient(135deg, #e8630c, #c85000);
  --gradient-blue: linear-gradient(135deg, #e8630c, #a02800);
  --shadow-sm: 0 2px 8px rgba(80,0,0,0.08);
  --shadow-md: 0 4px 20px rgba(80,0,0,0.12);
  --shadow-lg: 0 10px 40px rgba(80,0,0,0.15);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --font-cn: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-en: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --container: 1200px;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-cn);
  color: var(--text-body);
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

body.en-lang {
  font-family: var(--font-en);
}

img { max-width: 100%; height: auto; display: block; }
a { text-decoration: none; color: inherit; transition: var(--transition); }
ul { list-style: none; }
.container { max-width: var(--container); margin: 0 auto; padding: 0 24px; }

/* --- Typography --- */
h1, h2, h3, h4, h5, h6 { line-height: 1.2; font-weight: 700; color: var(--primary); }
.section-tag {
  display: inline-block;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--secondary);
  margin-bottom: 12px;
}
.section-title {
  font-size: clamp(28px, 4vw, 42px);
  margin-bottom: 16px;
    color: var(--secondary);
}
.section-subtitle {
  font-size: 18px;
  color: var(--text-secondary);
  max-width: 600px;
}
.section-header {
  text-align: center;
  margin-bottom: 60px;
}
.section-header .section-subtitle {
  margin: 0 auto;
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  font-size: 15px;
  font-weight: 600;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: var(--transition);
  font-family: inherit;
}
.btn-primary {
  background: var(--gradient-accent);
  color: var(--primary);
  box-shadow: 0 4px 15px rgba(232, 99, 12, 0.3);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 25px rgba(232, 99, 12, 0.4);
}
.btn-outline {
  background: transparent;
  color: var(--text-primary);
  border: 2px solid rgba(204, 214, 246, 0.3);
}
.btn-outline:hover {
  border-color: var(--secondary);
  color: var(--secondary);
  transform: translateY(-2px);
}
.btn-white {
  background: var(--bg-white);
  color: var(--primary);
  box-shadow: var(--shadow-md);
}
.btn-white:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

/* --- Navigation --- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(10, 25, 47, 0.95);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(232, 99, 12, 0.1);
  transition: var(--transition);
}
.navbar.scrolled {
  background: rgba(10, 25, 47, 0.98);
  box-shadow: 0 4px 30px rgba(0,0,0,0.3);
}
.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}
.nav-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 22px;
  font-weight: 700;
  color: var(--text-primary);
}
.nav-logo img {
  height: 48px;
  width: auto;
  border-radius: 50%;
  border: 2px solid var(--secondary);
  padding: 2px;
  background: rgba(232,99,12,0.1);
}
.nav-logo .logo-icon {
  display: none;
}
.nav-logo .logo-text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}
.nav-logo .logo-text .cn { font-size: 16px; }
.nav-logo .logo-text .en { font-size: 12px; color: var(--secondary); letter-spacing: 1px; }

@media (max-width: 480px) {
  .nav-logo .logo-text .cn { font-size: 13px; }
  .nav-logo .logo-text .en { display: none; }
  .nav-logo img { height: 32px; }
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 8px;
}
.nav-links a {
  padding: 8px 16px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  transition: var(--transition);
  position: relative;
}
.nav-links a:hover,
.nav-links a.active {
  color: var(--secondary);
  background: rgba(232, 99, 12, 0.1);
}
.lang-toggle {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 6px 14px;
  border: 1px solid rgba(100, 255, 218, 0.3);
  border-radius: 20px;
  font-size: 13px;
  font-weight: 600;
  color: var(--secondary);
  cursor: pointer;
  background: transparent;
  transition: var(--transition);
  font-family: inherit;
  margin-left: 8px;
}
.lang-toggle:hover {
  background: rgba(232, 99, 12, 0.12);
  border-color: var(--secondary);
}
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
  background: none;
  border: none;
}
.hamburger span {
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: var(--transition);
}

/* --- Hero Section --- */
.hero {
  min-height: 100vh;
  background: var(--gradient-tech);
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  background:
    radial-gradient(ellipse at 20% 50%, rgba(100, 255, 218, 0.08) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 20%, rgba(74, 158, 255, 0.08) 0%, transparent 50%),
    radial-gradient(ellipse at 50% 80%, rgba(124, 77, 255, 0.05) 0%, transparent 50%);
  pointer-events: none;
}
.hero-grid-bg {
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  background-image:
    linear-gradient(rgba(232, 99, 12, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(232, 99, 12, 0.04) 1px, transparent 1px);
  background-size: 60px 60px;
  pointer-events: none;
}
.hero .container {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}
.hero-content h1 {
  font-size: clamp(36px, 5vw, 56px);
  color: var(--text-primary);
  margin-bottom: 8px;
  line-height: 1.1;
}
.hero-content h1 .highlight {
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-content .hero-sub {
  font-size: 20px;
  color: var(--secondary);
  font-weight: 500;
  margin-bottom: 20px;
}
.hero-content p {
  font-size: 16px;
  color: var(--text-secondary);
  max-width: 540px;
  margin-bottom: 36px;
  line-height: 1.8;
}
.hero-buttons { display: flex; gap: 16px; flex-wrap: wrap; }
.hero-visual {
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}
.hero-card {
  background: rgba(17, 34, 64, 0.8);
  border: 1px solid rgba(100, 255, 218, 0.15);
  border-radius: var(--radius-lg);
  padding: 40px;
  width: 100%;
  max-width: 460px;
  backdrop-filter: blur(10px);
}
.hero-card-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-bottom: 30px;
}
.hero-stat {
  text-align: center;
  padding: 16px;
  border-radius: var(--radius-sm);
  background: rgba(232, 99, 12, 0.08);
  border: 1px solid rgba(232, 99, 12, 0.15);
}
.hero-stat .num {
  font-size: 28px;
  font-weight: 700;
  color: var(--secondary);
}
.hero-stat .label {
  font-size: 12px;
  color: var(--text-secondary);
  margin-top: 4px;
}
.hero-card-services {
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.hero-service-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  background: rgba(255,255,255,0.03);
  border: 1px solid rgba(255,255,255,0.05);
  font-size: 14px;
  color: var(--text-secondary);
}
.hero-service-item .icon {
  width: 32px;
  height: 32px;
  background: rgba(232, 99, 12, 0.12);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  flex-shrink: 0;
}

/* --- Floating Particles --- */
.floating-elements {
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  pointer-events: none;
  overflow: hidden;
}
.floating-elements .particle {
  position: absolute;
  width: 4px;
  height: 4px;
  background: var(--secondary);
  border-radius: 50%;
  opacity: 0.3;
  animation: float-up linear infinite;
}
@keyframes float-up {
  0% { transform: translateY(100vh) scale(0); opacity: 0; }
  10% { opacity: 0.3; }
  90% { opacity: 0.3; }
  100% { transform: translateY(-10vh) scale(1); opacity: 0; }
}

/* --- Sections --- */
.section { padding: 100px 0; }
.section-alt { background: var(--bg-section); }

/* --- About Preview --- */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}
.about-content h2 { font-size: 32px; margin-bottom: 20px; }
.about-content p { margin-bottom: 16px; color: var(--text-body); line-height: 1.8; }
.about-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.about-stat-card {
  background: var(--bg-white);
  border-radius: var(--radius-md);
  padding: 30px 20px;
  text-align: center;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}
.about-stat-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}
.about-stat-card .num {
  font-size: 36px;
  font-weight: 700;
    color: var(--secondary);
}
.about-stat-card .label { font-size: 14px; color: var(--text-secondary); margin-top: 8px; }

/* --- Products / Services --- */
.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.service-card {
  background: var(--bg-white);
  border-radius: var(--radius-md);
  padding: 36px 28px;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  border: 1px solid transparent;
  position: relative;
  overflow: hidden;
}
.service-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: var(--gradient-accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: var(--transition);
}
.service-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-md);
  border-color: rgba(100, 255, 218, 0.2);
}
.service-card:hover::before { transform: scaleX(1); }
.service-card .icon {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  margin-bottom: 20px;
}
.service-card .icon.green { background: rgba(232, 99, 12, 0.15); }
.service-card .icon.blue { background: rgba(232, 99, 12, 0.12); }
.service-card .icon.purple { background: rgba(200, 144, 0, 0.15); }
.service-card .icon.orange { background: rgba(255, 171, 64, 0.15); }
.service-card .icon.teal { background: rgba(90, 138, 60, 0.15); }
.service-card .icon.pink { background: rgba(160, 40, 0, 0.15); }
.service-card h3 { font-size: 18px; margin-bottom: 12px; }
.service-card p { font-size: 14px; color: var(--text-secondary); line-height: 1.7; }

/* --- Smart Agriculture Section --- */
.agri-section {
  background: linear-gradient(135deg, #1a0f0a 0%, #3d1f12 50%, #5c2800 100%);
  color: var(--text-primary);
}
.agri-section .section-title {
  -webkit-text-fill-color: var(--text-primary);
  background: none;
}
.agri-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
}
.agri-feature {
  display: flex;
  gap: 16px;
  padding: 20px;
  background: rgba(255,255,255,0.05);
  border-radius: var(--radius-md);
  border: 1px solid rgba(232, 99, 12, 0.15);
}
.agri-feature .icon {
  font-size: 28px;
  flex-shrink: 0;
}
.agri-feature h4 {
  color: var(--secondary);
  font-size: 16px;
  margin-bottom: 8px;
}
.agri-feature p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
}
.agri-herbs {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-top: 40px;
}
.herb-card {
  text-align: center;
  padding: 20px;
  background: rgba(255,255,255,0.03);
  border: 1px solid rgba(232, 99, 12, 0.15);
  border-radius: var(--radius-md);
  transition: var(--transition);
}
.herb-card:hover {
  background: rgba(232, 99, 12, 0.1);
  transform: translateY(-4px);
}
.herb-card .emoji { font-size: 40px; margin-bottom: 8px; display: block; }
.herb-card h4 { color: var(--secondary); font-size: 16px; }
.herb-card p { font-size: 13px; color: var(--text-secondary); margin-top: 4px; }

/* --- News Section --- */
.news-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.news-card {
  background: var(--bg-white);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}
.news-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}
.news-card-image {
  height: 200px;
  background: var(--gradient-tech);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-primary);
  font-size: 40px;
}
.news-card-body { padding: 24px; }
.news-card-body .date {
  font-size: 12px;
  color: var(--secondary);
  font-weight: 600;
  margin-bottom: 8px;
}
.news-card-body h3 {
  font-size: 16px;
  margin-bottom: 8px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.news-card-body p {
  font-size: 14px;
  color: var(--text-secondary);
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.news-card-body .read-more {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 13px;
  color: var(--accent-blue);
  font-weight: 600;
  margin-top: 12px;
}

/* --- Contact Section --- */
.contact-wrap {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
}
.contact-info h3 {
  font-size: 24px;
  margin-bottom: 16px;
}
.contact-info > p {
  color: var(--text-secondary);
  margin-bottom: 32px;
}
.contact-details { display: flex; flex-direction: column; gap: 20px; }
.contact-item {
  display: flex;
  gap: 16px;
  align-items: flex-start;
}
.contact-item .icon {
  width: 44px;
  height: 44px;
  background: rgba(232, 99, 12, 0.12);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  flex-shrink: 0;
}
.contact-item h4 { font-size: 14px; color: var(--text-secondary); margin-bottom: 4px; }
.contact-item p { font-size: 16px; font-weight: 500; }

.contact-form {
  background: var(--bg-white);
  padding: 40px;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
}
.form-group { margin-bottom: 20px; }
.form-group label {
  display: block;
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--text-dark);
}
.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 12px 16px;
  border: 2px solid #e2e8f0;
  border-radius: var(--radius-sm);
  font-size: 15px;
  font-family: inherit;
  transition: var(--transition);
  background: var(--bg-white);
}
.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--secondary);
  box-shadow: 0 0 0 3px rgba(232, 99, 12, 0.15);
}
.form-group textarea { resize: vertical; min-height: 120px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }

/* --- Footer --- */
.footer {
  background: var(--bg-dark);
  color: var(--text-secondary);
  padding: 60px 0 30px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}
.footer-brand .nav-logo { margin-bottom: 16px; }
.footer-brand p { font-size: 14px; line-height: 1.8; }
.footer h4 {
  color: var(--text-primary);
  font-size: 16px;
  margin-bottom: 20px;
}
.footer-links a {
  display: block;
  padding: 6px 0;
  font-size: 14px;
  color: var(--text-secondary);
}
.footer-links a:hover { color: var(--secondary); padding-left: 4px; }
.footer-bottom {
  border-top: 1px solid rgba(204, 214, 246, 0.1);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 13px;
}
.footer-social {
  display: flex;
  gap: 12px;
}
.footer-social a {
  width: 36px;
  height: 36px;
  border: 1px solid rgba(204, 214, 246, 0.2);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  transition: var(--transition);
}
.footer-social a:hover {
  border-color: var(--secondary);
  background: rgba(232, 99, 12, 0.12);
}

/* --- Page Header (for inner pages) --- */
.page-header {
  padding-top: 120px;
  padding-bottom: 60px;
  background: var(--gradient-tech);
  text-align: center;
  position: relative;
}
.page-header h1 {
  color: var(--text-primary);
  font-size: clamp(28px, 4vw, 42px);
  margin-bottom: 12px;
}
.page-header p {
  color: var(--text-secondary);
  font-size: 16px;
  max-width: 600px;
  margin: 0 auto;
}

/* --- Animations --- */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* --- Mobile Responsive --- */
@media (max-width: 1024px) {
  .hero .container { grid-template-columns: 1fr; gap: 40px; }
  .hero-content { text-align: center; }
  .hero-content p { margin: 0 auto 36px; }
  .hero-buttons { justify-content: center; }
  .hero-card { max-width: 100%; }
  .about-grid { grid-template-columns: 1fr; }
  .services-grid { grid-template-columns: repeat(2, 1fr); }
  .contact-wrap { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
  .news-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .hamburger { display: flex; }
  .nav-links {
    position: fixed;
    top: 72px;
    left: 0;
    right: 0;
    background: rgba(10, 25, 47, 0.98);
    backdrop-filter: blur(20px);
    flex-direction: column;
    padding: 20px;
    gap: 4px;
    transform: translateY(-120%);
    transition: var(--transition);
    border-bottom: 1px solid rgba(232, 99, 12, 0.1);
  }
  .nav-links.open { transform: translateY(0); }
  .nav-links a { width: 100%; padding: 12px 16px; }
  .lang-toggle { margin-left: 0; width: 100%; justify-content: center; margin-top: 8px; }
  .services-grid { grid-template-columns: 1fr; }
  .news-grid { grid-template-columns: 1fr; }
  .about-stats { grid-template-columns: 1fr; }
  .agri-grid { grid-template-columns: 1fr; }
  .agri-herbs { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; gap: 12px; text-align: center; }
  .hero-stat .num { font-size: 22px; }
}

/* --- Scrollbar --- */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: var(--bg-dark); }
::-webkit-scrollbar-thumb { background: rgba(232, 99, 12, 0.3); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: rgba(232, 99, 12, 0.5); }