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

:root {
  --color-primary: #1e3a5f;
  --color-primary-light: #2a5298;
  --color-accent: #10b981;
  --color-accent-dark: #059669;
  --color-orange: #f59e0b;
  --color-purple: #8b5cf6;
  --color-blue: #3b82f6;
  --color-text: #1e293b;
  --color-text-light: #64748b;
  --color-bg: #ffffff;
  --color-bg-alt: #f1f5f9;
  --color-bg-dark: #0f172a;
  --color-border: #e2e8f0;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.07), 0 2px 4px rgba(0,0,0,0.06);
  --shadow-lg: 0 10px 25px rgba(0,0,0,0.1), 0 4px 10px rgba(0,0,0,0.05);
  --shadow-xl: 0 20px 50px rgba(0,0,0,0.12);
  --radius: 12px;
  --radius-sm: 8px;
  --radius-lg: 16px;
  --transition: 0.3s ease;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

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

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

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

ul {
  list-style: none;
}

/* ===== Navigation ===== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: all var(--transition);
}

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

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-primary);
}

.logo-img {
  height: 38px;
  width: auto;
  flex-shrink: 0;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 36px;
}

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

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

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

.nav-links a:hover::after,
.nav-links a.active::after {
  width: 100%;
}

.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.menu-toggle span {
  width: 24px;
  height: 2px;
  background: var(--color-primary);
  border-radius: 2px;
  transition: all var(--transition);
}

/* ===== Hero ===== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  background: linear-gradient(135deg, #0f172a 0%, #1e3a5f 40%, #1a4a3a 100%);
  overflow: hidden;
  padding: 120px 0 80px;
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 20% 30%, rgba(16,185,129,0.15), transparent),
    radial-gradient(ellipse 60% 80% at 80% 70%, rgba(59,130,246,0.1), transparent);
  pointer-events: none;
}

.hero::after {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
  background-size: 60px 60px;
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  color: #fff;
}

.hero-badge {
  display: inline-block;
  padding: 8px 20px;
  border: 1px solid rgba(16,185,129,0.4);
  border-radius: 50px;
  font-size: 0.9rem;
  color: var(--color-accent);
  background: rgba(16,185,129,0.1);
  margin-bottom: 32px;
  letter-spacing: 2px;
}

.hero-title {
  font-size: 2.8rem;
  font-weight: 800;
  line-height: 1.3;
  margin-bottom: 20px;
  background: linear-gradient(135deg, #fff 0%, #a7f3d0 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 1.15rem;
  color: rgba(255,255,255,0.7);
  max-width: 720px;
  margin: 0 auto 40px;
  line-height: 1.9;
}

.hero-cta {
  display: flex;
  gap: 16px;
  justify-content: center;
  margin-bottom: 64px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 36px;
  border-radius: var(--radius-sm);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
  border: none;
  white-space: nowrap;
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-accent), #059669);
  color: #fff;
  box-shadow: 0 4px 15px rgba(16,185,129,0.4);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(16,185,129,0.5);
}

.btn-outline {
  background: transparent;
  color: #fff;
  border: 2px solid rgba(255,255,255,0.3);
}

.btn-outline:hover {
  background: rgba(255,255,255,0.1);
  border-color: rgba(255,255,255,0.6);
  transform: translateY(-2px);
}

.btn-block {
  width: 100%;
}

.hero-stats {
  display: flex;
  justify-content: center;
  gap: 64px;
  flex-wrap: wrap;
}

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

.stat-number {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--color-accent);
  display: inline;
}

.stat-unit {
  font-size: 1rem;
  color: var(--color-accent);
  font-weight: 600;
}

.stat-label {
  display: block;
  font-size: 0.9rem;
  color: rgba(255,255,255,0.5);
  margin-top: 4px;
}

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

.section-header {
  text-align: center;
  margin-bottom: 64px;
}

.section-tag {
  display: inline-block;
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 12px;
  padding: 4px 12px;
  background: rgba(16,185,129,0.08);
  border-radius: 4px;
}

.section-header h2 {
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--color-primary);
  margin-bottom: 12px;
}

.section-header p {
  font-size: 1.05rem;
  color: var(--color-text-light);
  max-width: 600px;
  margin: 0 auto;
}

/* ===== About ===== */
.about {
  background: var(--color-bg);
}

.about-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 80px;
  align-items: start;
}

.about-text h3 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 16px;
}

.about-text p {
  color: var(--color-text-light);
  margin-bottom: 16px;
  line-height: 1.9;
}

.about-text strong {
  color: var(--color-accent-dark);
}

.about-features {
  margin-top: 32px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.feature {
  display: flex;
  gap: 16px;
  align-items: flex-start;
}

.feature-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-sm);
  background: rgba(16,185,129,0.08);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  flex-shrink: 0;
}

.feature strong {
  display: block;
  font-size: 0.95rem;
  color: var(--color-primary);
  margin-bottom: 2px;
}

.feature p {
  font-size: 0.88rem;
  color: var(--color-text-light);
  margin-bottom: 0;
}

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

.about-card {
  padding: 28px 20px;
  border-radius: var(--radius);
  text-align: center;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text-light);
  transition: transform var(--transition);
}

.about-card:hover {
  transform: translateY(-4px);
}

.about-card-num {
  display: block;
  font-size: 1.8rem;
  font-weight: 800;
  margin-bottom: 4px;
}

.about-card-1 { background: linear-gradient(135deg, #dbeafe, #eff6ff); color: var(--color-primary-light); }
.about-card-2 { background: linear-gradient(135deg, #d1fae5, #ecfdf5); color: var(--color-accent-dark); }
.about-card-3 { background: linear-gradient(135deg, #fef3c7, #fffbeb); color: #b45309; }
.about-card-4 { background: linear-gradient(135deg, #ede9fe, #f5f3ff); color: #7c3aed; }

.about-card-1 .about-card-num { color: var(--color-primary-light); }
.about-card-2 .about-card-num { color: var(--color-accent-dark); }
.about-card-3 .about-card-num { color: #b45309; }
.about-card-4 .about-card-num { color: #7c3aed; }

/* ===== Products ===== */
.products {
  background: var(--color-bg-alt);
}

.products-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
}

.product-card {
  background: #fff;
  border-radius: var(--radius-lg);
  padding: 40px 32px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
  transition: all var(--transition);
}

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

.product-icon {
  width: 64px;
  height: 64px;
  margin-bottom: 24px;
}

.product-icon svg {
  width: 100%;
  height: 100%;
}

.product-card h3 {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 12px;
}

.product-card > p {
  font-size: 0.93rem;
  color: var(--color-text-light);
  line-height: 1.8;
  margin-bottom: 20px;
}

.product-features {
  padding-top: 16px;
  border-top: 1px solid var(--color-border);
}

.product-features li {
  position: relative;
  padding-left: 20px;
  font-size: 0.9rem;
  color: var(--color-text-light);
  margin-bottom: 8px;
}

.product-features li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 8px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-accent);
}

.product-features li:last-child {
  margin-bottom: 0;
}

/* ===== Cases ===== */
.cases {
  background: var(--color-bg);
}

.cases-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

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

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

.case-image {
  height: 180px;
  position: relative;
  display: flex;
  align-items: flex-end;
  padding: 16px;
}

.case-tag {
  display: inline-block;
  padding: 4px 14px;
  background: rgba(255,255,255,0.2);
  backdrop-filter: blur(4px);
  color: #fff;
  font-size: 0.8rem;
  font-weight: 600;
  border-radius: 50px;
}

.case-body {
  padding: 24px;
}

.case-body h3 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 8px;
  line-height: 1.5;
}

.case-body > p {
  font-size: 0.88rem;
  color: var(--color-text-light);
  line-height: 1.7;
  margin-bottom: 16px;
}

.case-stats {
  display: flex;
  gap: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--color-border);
  font-size: 0.8rem;
  color: var(--color-text-light);
  flex-wrap: wrap;
}

.case-stats strong {
  color: var(--color-accent-dark);
}

/* ===== Contact ===== */
.contact {
  background: var(--color-bg-alt);
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 48px;
  max-width: 1000px;
  margin: 0 auto;
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.contact-item {
  display: flex;
  gap: 16px;
  align-items: flex-start;
}

.contact-icon {
  width: 48px;
  height: 48px;
  background: rgba(16,185,129,0.08);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  flex-shrink: 0;
}

.contact-item strong {
  display: block;
  font-size: 0.95rem;
  color: var(--color-primary);
  margin-bottom: 4px;
}

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

.contact-form {
  background: #fff;
  padding: 36px;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
}

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

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

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

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-family: inherit;
  color: var(--color-text);
  background: var(--color-bg-alt);
  transition: border-color var(--transition), box-shadow var(--transition);
  outline: none;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(16,185,129,0.1);
  background: #fff;
}

.form-group textarea {
  resize: vertical;
  min-height: 100px;
}

.contact-form .btn {
  margin-top: 8px;
}

/* ===== Footer ===== */
.footer {
  background: var(--color-bg-dark);
  color: rgba(255,255,255,0.7);
  padding: 64px 0 32px;
}

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

.footer-logo {
  font-size: 1.3rem;
  font-weight: 700;
  color: #fff;
  display: inline-block;
  margin-bottom: 16px;
}

.footer-brand p {
  font-size: 0.9rem;
  line-height: 1.8;
}

.footer-links h4,
.footer-qr h4 {
  font-size: 1rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 20px;
}

.footer-links li {
  margin-bottom: 12px;
}

.footer-links a {
  font-size: 0.9rem;
  color: rgba(255,255,255,0.6);
  transition: color var(--transition);
}

.footer-links a:hover {
  color: var(--color-accent);
}

.qr-placeholder {
  width: 120px;
  height: 120px;
  margin-bottom: 12px;
}

.footer-qr span {
  font-size: 0.8rem;
  color: rgba(255,255,255,0.5);
}

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 0.85rem;
}

.footer-bottom a {
  color: rgba(255,255,255,0.4);
  transition: color var(--transition);
}

.footer-bottom a:hover {
  color: rgba(255,255,255,0.7);
}

/* ===== Toast ===== */
.toast {
  position: fixed;
  top: 24px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--color-accent);
  color: #fff;
  padding: 14px 28px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.95rem;
  box-shadow: var(--shadow-lg);
  z-index: 9999;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.4s ease;
}

.toast.show {
  opacity: 1;
}

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .products-grid {
    grid-template-columns: 1fr 1fr;
  }
  .cases-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .nav-links {
    position: fixed;
    top: 70px;
    left: 0;
    right: 0;
    background: rgba(255,255,255,0.98);
    backdrop-filter: blur(16px);
    flex-direction: column;
    gap: 0;
    padding: 16px 0;
    border-bottom: 1px solid var(--color-border);
    transform: translateY(-120%);
    transition: transform var(--transition);
    z-index: 999;
  }

  .nav-links.open {
    transform: translateY(0);
  }

  .nav-links a {
    display: block;
    padding: 14px 24px;
    font-size: 1rem;
  }

  .menu-toggle {
    display: flex;
  }

  .hero-title {
    font-size: 1.8rem;
  }

  .hero-subtitle {
    font-size: 1rem;
  }

  .hero-stats {
    gap: 32px;
  }

  .stat-number {
    font-size: 1.8rem;
  }

  .hero-cta {
    flex-direction: column;
    align-items: center;
  }

  section {
    padding: 64px 0;
  }

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

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

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

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

  .form-row {
    grid-template-columns: 1fr;
  }

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

@media (max-width: 480px) {
  .hero-title {
    font-size: 1.4rem;
  }

  .section-header h2 {
    font-size: 1.6rem;
  }

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

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

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