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

:root {
  --primary: #1a56db;
  --primary-dark: #1242a8;
  --primary-light: #e8f0fe;
  --accent: #f97316;
  --accent-dark: #ea580c;
  --success: #10b981;
  --text: #1f2937;
  --text-secondary: #4b5563;
  --text-light: #9ca3af;
  --bg: #ffffff;
  --bg-alt: #f8fafc;
  --bg-dark: #0f172a;
  --border: #e5e7eb;
  --radius: 12px;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 14px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 30px rgba(0, 0, 0, 0.12);
  --transition: 0.3s ease;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a {
  text-decoration: none;
  color: inherit;
}

ul,
ol {
  list-style: none;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

button {
  cursor: pointer;
  border: none;
  font-family: inherit;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ==================== Header & Navigation ==================== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid transparent;
  transition: all var(--transition);
}

.header.scrolled {
  border-bottom-color: var(--border);
  box-shadow: var(--shadow-sm);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--primary);
}

.nav-logo .logo-icon {
  width: 38px;
  height: 38px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 1.1rem;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-links a {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color var(--transition);
  position: relative;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--primary);
}

.nav-links a.active::after {
  content: '';
  position: absolute;
  bottom: -6px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--primary);
  border-radius: 1px;
}

.nav-cta {
  background: var(--primary);
  color: #fff !important;
  padding: 10px 22px;
  border-radius: 8px;
  font-weight: 600;
  transition: all var(--transition);
}

.nav-cta:hover {
  background: var(--primary-dark);
  transform: translateY(-1px);
}

.nav-cta::after {
  display: none !important;
}

.mobile-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  padding: 4px;
}

.mobile-toggle span {
  width: 24px;
  height: 2.5px;
  background: var(--text);
  border-radius: 2px;
  transition: all var(--transition);
}

.mobile-menu {
  display: none;
}

/* ==================== Hero Section ==================== */
.hero {
  padding: 140px 0 100px;
  background: linear-gradient(135deg, #f0f5ff 0%, #e8f4fd 50%, #fef3e2 100%);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -100px;
  right: -100px;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(26, 86, 219, 0.08) 0%, transparent 70%);
  border-radius: 50%;
}

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

.hero-content h1 {
  font-size: 3.2rem;
  font-weight: 800;
  line-height: 1.2;
  color: var(--text);
  margin-bottom: 20px;
}

.hero-content h1 .highlight {
  color: var(--primary);
}

.hero-content h1 .accent-text {
  color: var(--accent);
}

.hero-content p {
  font-size: 1.15rem;
  color: var(--text-secondary);
  margin-bottom: 36px;
  max-width: 520px;
}

.hero-buttons {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: 10px;
  font-size: 1rem;
  font-weight: 600;
  transition: all var(--transition);
}

.btn-primary {
  background: var(--primary);
  color: #fff;
  box-shadow: 0 4px 14px rgba(26, 86, 219, 0.3);
}

.btn-primary:hover {
  background: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(26, 86, 219, 0.4);
}

.btn-secondary {
  background: #fff;
  color: var(--text);
  border: 1.5px solid var(--border);
}

.btn-secondary:hover {
  border-color: var(--primary);
  color: var(--primary);
  transform: translateY(-2px);
}

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

.hero-illustration {
  width: 100%;
  max-width: 480px;
  background: #fff;
  border-radius: 20px;
  padding: 40px;
  box-shadow: var(--shadow-lg);
  position: relative;
}

.hero-illustration .warehouse {
  width: 100%;
  height: 260px;
  background: linear-gradient(180deg, #e8f0fe 0%, #d1e0fa 100%);
  border-radius: 16px;
  position: relative;
  overflow: hidden;
}

.hero-illustration .warehouse .shelf {
  position: absolute;
  left: 20px;
  right: 20px;
  height: 30px;
  background: var(--primary);
  border-radius: 6px;
  opacity: 0.8;
}

.hero-illustration .warehouse .shelf:nth-child(1) { top: 30px; }
.hero-illustration .warehouse .shelf:nth-child(2) { top: 80px; }
.hero-illustration .warehouse .shelf:nth-child(3) { top: 130px; }
.hero-illustration .warehouse .shelf:nth-child(4) { top: 180px; }

.hero-illustration .truck {
  position: absolute;
  bottom: -20px;
  right: -10px;
  font-size: 4rem;
  animation: drive 4s ease-in-out infinite;
}

@keyframes drive {
  0%, 100% { transform: translateX(0); }
  50% { transform: translateX(-20px); }
}

.hero-stats {
  display: flex;
  gap: 24px;
  margin-top: 40px;
}

.stat-item {
  text-align: center;
}

.stat-item .num {
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--primary);
}

.stat-item .label {
  font-size: 0.8rem;
  color: var(--text-light);
}

/* ==================== Section Common ==================== */
.section {
  padding: 100px 0;
}

.section-alt {
  background: var(--bg-alt);
}

.section-header {
  text-align: center;
  margin-bottom: 60px;
}

.section-header .badge {
  display: inline-block;
  padding: 6px 16px;
  background: var(--primary-light);
  color: var(--primary);
  font-size: 0.85rem;
  font-weight: 600;
  border-radius: 20px;
  margin-bottom: 16px;
}

.section-header h2 {
  font-size: 2.2rem;
  font-weight: 800;
  margin-bottom: 16px;
  color: var(--text);
}

.section-header p {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 640px;
  margin: 0 auto;
}

/* ==================== Services Grid ==================== */
.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.service-card {
  background: #fff;
  border-radius: var(--radius);
  padding: 36px 28px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border);
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}

.service-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  transform: scaleX(0);
  transition: transform var(--transition);
}

.service-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: transparent;
}

.service-card:hover::before {
  transform: scaleX(1);
}

.service-icon {
  width: 60px;
  height: 60px;
  border-radius: 14px;
  background: var(--primary-light);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
  margin-bottom: 20px;
}

.service-card h3 {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.service-card p {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ==================== Solutions ==================== */
.solutions-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}

.solution-card {
  display: flex;
  gap: 24px;
  background: #fff;
  border-radius: var(--radius);
  padding: 32px;
  border: 1px solid var(--border);
  transition: all var(--transition);
}

.solution-card:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--primary);
}

.solution-icon {
  flex-shrink: 0;
  width: 56px;
  height: 56px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 1.4rem;
}

.solution-content h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.solution-content p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 14px;
}

.solution-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.solution-tags span {
  padding: 4px 12px;
  background: var(--bg-alt);
  font-size: 0.8rem;
  color: var(--text-secondary);
  border-radius: 6px;
}

/* ==================== Pricing ==================== */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  align-items: start;
}

.pricing-card {
  background: #fff;
  border-radius: 16px;
  padding: 40px 32px;
  border: 2px solid var(--border);
  transition: all var(--transition);
  position: relative;
}

.pricing-card.featured {
  border-color: var(--primary);
  box-shadow: 0 10px 40px rgba(26, 86, 219, 0.15);
  transform: translateY(-8px);
}

.pricing-card.featured .popular-badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--accent);
  color: #fff;
  padding: 6px 20px;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 600;
}

.pricing-card h3 {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.pricing-card .price {
  font-size: 2.8rem;
  font-weight: 800;
  color: var(--primary);
  margin-bottom: 8px;
}

.pricing-card .price .unit {
  font-size: 1rem;
  color: var(--text-light);
  font-weight: 500;
}

.pricing-card .desc {
  font-size: 0.85rem;
  color: var(--text-light);
  margin-bottom: 28px;
  padding-bottom: 28px;
  border-bottom: 1px solid var(--border);
}

.pricing-features {
  margin-bottom: 32px;
}

.pricing-features li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 8px 0;
  font-size: 0.92rem;
  color: var(--text-secondary);
}

.pricing-features .check {
  color: var(--success);
  font-weight: 700;
  flex-shrink: 0;
}

.pricing-card .btn {
  width: 100%;
  justify-content: center;
}

/* ==================== Cases ==================== */
.cases-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.case-card {
  background: #fff;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border);
  transition: all var(--transition);
}

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

.case-image {
  height: 160px;
  background: linear-gradient(135deg, var(--primary-light), #fce7d3);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3rem;
}

.case-content {
  padding: 24px;
}

.case-content .tag {
  display: inline-block;
  padding: 4px 10px;
  background: var(--primary-light);
  color: var(--primary);
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: 4px;
  margin-bottom: 12px;
}

.case-content h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.case-content p {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 16px;
}

.case-stats {
  display: flex;
  gap: 20px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
}

.case-stats .stat {
  flex: 1;
}

.case-stats .stat .val {
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--primary);
}

.case-stats .stat .lbl {
  font-size: 0.75rem;
  color: var(--text-light);
}

/* ==================== About ==================== */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.about-content h2 {
  font-size: 2.2rem;
  font-weight: 800;
  margin-bottom: 20px;
}

.about-content p {
  font-size: 1rem;
  color: var(--text-secondary);
  margin-bottom: 20px;
  line-height: 1.8;
}

.about-visual {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.about-stat {
  background: #fff;
  border-radius: var(--radius);
  padding: 28px 20px;
  text-align: center;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border);
}

.about-stat .big-num {
  font-size: 2.4rem;
  font-weight: 800;
  color: var(--primary);
  display: block;
}

.about-stat .big-label {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

/* ==================== Contact ==================== */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
}

.contact-info-list {
  margin-bottom: 32px;
}

.contact-item {
  display: flex;
  gap: 16px;
  padding: 18px 0;
  border-bottom: 1px solid var(--border);
}

.contact-item .icon-box {
  width: 48px;
  height: 48px;
  border-radius: 10px;
  background: var(--primary-light);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
  font-size: 1.2rem;
  flex-shrink: 0;
}

.contact-item .details h4 {
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 4px;
}

.contact-item .details p {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.contact-form {
  background: #fff;
  border-radius: var(--radius);
  padding: 40px;
  box-shadow: var(--shadow-md);
}

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

.form-group label {
  display: block;
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 12px 16px;
  border: 1.5px solid var(--border);
  border-radius: 8px;
  font-size: 0.95rem;
  font-family: inherit;
  transition: border-color var(--transition);
  background: var(--bg-alt);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--primary);
  background: #fff;
}

.form-group textarea {
  min-height: 120px;
  resize: vertical;
}

/* ==================== FAQ ==================== */
.faq-list {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  background: #fff;
  border-radius: var(--radius);
  margin-bottom: 12px;
  border: 1px solid var(--border);
  overflow: hidden;
}

.faq-question {
  padding: 20px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  font-weight: 600;
  transition: background var(--transition);
}

.faq-question:hover {
  background: var(--bg-alt);
}

.faq-question .toggle {
  font-size: 1.5rem;
  color: var(--primary);
  transition: transform var(--transition);
}

.faq-item.open .faq-question .toggle {
  transform: rotate(45deg);
}

.faq-answer {
  padding: 0 24px;
  max-height: 0;
  overflow: hidden;
  transition: all var(--transition);
}

.faq-item.open .faq-answer {
  max-height: 200px;
  padding: 0 24px 20px;
}

.faq-answer p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ==================== Footer ==================== */
.footer {
  background: var(--bg-dark);
  color: #fff;
  padding: 80px 0 40px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 60px;
}

.footer-brand .logo {
  font-size: 1.4rem;
  font-weight: 800;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.footer-brand .logo-icon {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
}

.footer-brand p {
  font-size: 0.88rem;
  color: #94a3b8;
  line-height: 1.7;
  max-width: 320px;
}

.footer-col h4 {
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 20px;
  color: #fff;
}

.footer-col ul li {
  margin-bottom: 10px;
}

.footer-col ul li a {
  font-size: 0.88rem;
  color: #94a3b8;
  transition: color var(--transition);
}

.footer-col ul li a:hover {
  color: #fff;
}

.footer-bottom {
  padding-top: 32px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.85rem;
  color: #64748b;
}

/* ==================== Back to Top ==================== */
.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--primary);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  box-shadow: var(--shadow-md);
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition);
  z-index: 999;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
}

.back-to-top:hover {
  background: var(--primary-dark);
  transform: translateY(-3px);
}

/* ==================== Toast ==================== */
.toast {
  position: fixed;
  top: 30px;
  right: 30px;
  background: var(--success);
  color: #fff;
  padding: 16px 24px;
  border-radius: 10px;
  box-shadow: var(--shadow-lg);
  font-weight: 600;
  transform: translateX(200%);
  transition: transform var(--transition);
  z-index: 2000;
}

.toast.show {
  transform: translateX(0);
}

/* ==================== Mobile Responsive ==================== */
@media (max-width: 992px) {
  .nav-links {
    display: none;
  }

  .mobile-toggle {
    display: flex;
  }

  .mobile-menu {
    display: none;
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    background: #fff;
    padding: 20px 24px;
    border-top: 1px solid var(--border);
    box-shadow: var(--shadow-md);
  }

  .mobile-menu.open {
    display: block;
  }

  .mobile-menu a {
    display: block;
    padding: 12px 0;
    font-size: 1rem;
    color: var(--text-secondary);
    border-bottom: 1px solid var(--border);
  }

  .mobile-menu a:last-child {
    border-bottom: none;
    margin-top: 12px;
    background: var(--primary);
    color: #fff;
    text-align: center;
    border-radius: 8px;
    padding: 12px;
  }

  .hero-grid,
  .about-grid,
  .contact-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .hero-content h1 {
    font-size: 2.4rem;
  }

  .hero-visual {
    order: -1;
  }

  .services-grid,
  .pricing-grid,
  .cases-grid {
    grid-template-columns: 1fr 1fr;
  }

  .solutions-grid {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .section {
    padding: 70px 0;
  }

  .hero {
    padding: 110px 0 70px;
  }

  .hero-content h1 {
    font-size: 2rem;
  }

  .section-header h2 {
    font-size: 1.8rem;
  }

  .services-grid,
  .pricing-grid,
  .cases-grid {
    grid-template-columns: 1fr;
  }

  .hero-stats {
    gap: 16px;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .footer-bottom {
    flex-direction: column;
    gap: 12px;
    text-align: center;
  }

  .about-visual {
    grid-template-columns: 1fr 1fr;
  }

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

/* ==================== Animations ==================== */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.fade-in {
  animation: fadeInUp 0.6s ease forwards;
}