/* ============================================
   Muyi Artemia - Professional B2B Website
   Color System & Design Tokens
   ============================================ */

:root {
  --primary: #0c3c5e;
  --primary-light: #1a5a8a;
  --accent: #0092c8;
  --accent-light: #00b4e6;
  --gold: #d4a843;
  --success: #2e8b57;
  --text-dark: #1a1a2e;
  --text-body: #3a3a4a;
  --text-light: #6a6a7a;
  --bg-white: #ffffff;
  --bg-light: #f5f8fb;
  --bg-section: #eef3f9;
  --border: #dde5ed;
  --shadow-sm: 0 2px 8px rgba(12,60,94,0.06);
  --shadow-md: 0 4px 20px rgba(12,60,94,0.08);
  --shadow-lg: 0 8px 40px rgba(12,60,94,0.12);
  --radius: 8px;
  --radius-lg: 16px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  color: var(--text-body);
  background: var(--bg-white);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

a {
  text-decoration: none;
  color: inherit;
  transition: color var(--transition);
}

ul, ol { list-style: none; }

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

/* ============================================
   Typography
   ============================================ */
h1, h2, h3, h4, h5 {
  color: var(--text-dark);
  line-height: 1.3;
  font-weight: 700;
}

h1 { font-size: clamp(2rem, 5vw, 3.2rem); }
h2 { font-size: clamp(1.6rem, 3.5vw, 2.4rem); }
h3 { font-size: clamp(1.2rem, 2.5vw, 1.5rem); }

.section-label {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 12px;
}

.section-title {
  margin-bottom: 16px;
}

.section-desc {
  color: var(--text-light);
  font-size: 1.05rem;
  max-width: 640px;
  margin: 0 auto 48px;
  text-align: center;
}

/* ============================================
   Navigation
   ============================================ */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  padding: 16px 0;
  transition: all var(--transition);
  background: transparent;
}

.navbar.scrolled {
  background: rgba(255,255,255,0.97);
  backdrop-filter: blur(12px);
  box-shadow: var(--shadow-sm);
  padding: 10px 0;
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--primary);
  letter-spacing: -0.5px;
}

.nav-logo .logo-icon {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--accent), var(--primary));
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 1.1rem;
  font-weight: 900;
}

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

.nav-links a {
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--text-dark);
  position: relative;
  padding: 4px 0;
}

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

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

.nav-cta {
  background: var(--accent);
  color: white !important;
  padding: 10px 24px !important;
  border-radius: 6px;
  font-weight: 600 !important;
  transition: background var(--transition) !important;
}

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

.nav-cta:hover {
  background: var(--accent-light);
}

/* Mobile menu */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 8px;
  background: none;
  border: none;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-dark);
  transition: all var(--transition);
  border-radius: 2px;
}

.nav-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.nav-toggle.active span:nth-child(2) {
  opacity: 0;
}

.nav-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
  background: linear-gradient(135deg, #0c3c5e 0%, #1a5a8a 40%, #0092c8 100%);
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 80%;
  height: 200%;
  background: radial-gradient(ellipse, rgba(0,146,200,0.15) 0%, transparent 70%);
  animation: heroGlow 8s ease-in-out infinite alternate;
}

@keyframes heroGlow {
  0% { transform: translate(0, 0) scale(1); }
  100% { transform: translate(-5%, 3%) scale(1.1); }
}

.hero::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 120px;
  background: linear-gradient(to top, var(--bg-white), transparent);
}

.hero .container {
  position: relative;
  z-index: 2;
  padding-top: 80px;
}

.hero-content {
  max-width: 700px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(255,255,255,0.12);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255,255,255,0.2);
  border-radius: 50px;
  padding: 8px 20px;
  font-size: 0.85rem;
  color: rgba(255,255,255,0.9);
  margin-bottom: 28px;
}

.hero-badge .dot {
  width: 8px;
  height: 8px;
  background: #4ade80;
  border-radius: 50%;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

.hero h1 {
  color: white;
  font-size: clamp(2.2rem, 5vw, 3.6rem);
  line-height: 1.15;
  margin-bottom: 24px;
  letter-spacing: -1px;
}

.hero h1 .highlight {
  background: linear-gradient(135deg, #f0c040, #f8d878);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-desc {
  font-size: 1.15rem;
  color: rgba(255,255,255,0.8);
  line-height: 1.8;
  margin-bottom: 40px;
  max-width: 560px;
}

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

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  border-radius: 8px;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
  border: none;
  text-decoration: none;
}

.btn-primary {
  background: white;
  color: var(--primary);
}

.btn-primary:hover {
  background: #f0f4f8;
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0,0,0,0.15);
}

.btn-outline {
  background: transparent;
  color: white;
  border: 2px solid rgba(255,255,255,0.4);
}

.btn-outline:hover {
  border-color: white;
  background: rgba(255,255,255,0.1);
}

.btn-accent {
  background: var(--accent);
  color: white;
}

.btn-accent:hover {
  background: var(--accent-light);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.hero-stats {
  display: flex;
  gap: 48px;
  margin-top: 64px;
  padding-top: 32px;
  border-top: 1px solid rgba(255,255,255,0.15);
}

.hero-stat {
  text-align: left;
}

.hero-stat .number {
  font-size: 2rem;
  font-weight: 800;
  color: white;
  line-height: 1;
  margin-bottom: 4px;
}

.hero-stat .label {
  font-size: 0.85rem;
  color: rgba(255,255,255,0.6);
}

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

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

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

.product-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: 28px;
}

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

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

.product-image {
  height: 220px;
  background: linear-gradient(135deg, #e8f4f8, #d0e8f0);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.product-image .product-icon {
  font-size: 4rem;
  opacity: 0.6;
}

.product-image .grade-badge {
  position: absolute;
  top: 16px;
  right: 16px;
  background: var(--primary);
  color: white;
  padding: 4px 14px;
  border-radius: 50px;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.5px;
}

.product-body {
  padding: 28px;
}

.product-body h3 {
  margin-bottom: 10px;
  font-size: 1.25rem;
}

.product-body p {
  color: var(--text-light);
  font-size: 0.92rem;
  margin-bottom: 20px;
  line-height: 1.6;
}

.spec-table {
  width: 100%;
  font-size: 0.85rem;
  margin-bottom: 20px;
}

.spec-table tr {
  border-bottom: 1px solid var(--border);
}

.spec-table td {
  padding: 8px 0;
}

.spec-table td:first-child {
  color: var(--text-light);
  width: 45%;
}

.spec-table td:last-child {
  font-weight: 600;
  color: var(--text-dark);
}

.product-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--accent);
  font-weight: 600;
  font-size: 0.9rem;
  transition: gap var(--transition);
}

.product-link:hover {
  gap: 10px;
}

/* ============================================
   About / Advantage Section
   ============================================ */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}

.about-text .section-label,
.about-text .section-title {
  text-align: left;
}

.about-text p {
  margin-bottom: 24px;
  line-height: 1.8;
}

.about-features {
  display: grid;
  gap: 20px;
  margin-top: 32px;
}

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

.feature-icon {
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, #e8f4f8, #cce8f2);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
}

.about-feature h4 {
  margin-bottom: 4px;
  font-size: 1rem;
}

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

.about-visual {
  position: relative;
}

.about-image-box {
  background: linear-gradient(135deg, #0c3c5e, #1a5a8a);
  border-radius: var(--radius-lg);
  padding: 48px;
  color: white;
  position: relative;
  overflow: hidden;
}

.about-image-box::before {
  content: '';
  position: absolute;
  top: -30%;
  right: -30%;
  width: 60%;
  height: 80%;
  background: radial-gradient(ellipse, rgba(0,146,200,0.3), transparent);
}

.stat-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  position: relative;
  z-index: 2;
}

.stat-item {
  background: rgba(255,255,255,0.1);
  backdrop-filter: blur(8px);
  border-radius: 12px;
  padding: 24px;
  border: 1px solid rgba(255,255,255,0.15);
}

.stat-item .number {
  font-size: 2rem;
  font-weight: 800;
  color: #f0c040;
  line-height: 1;
  margin-bottom: 6px;
}

.stat-item .desc {
  font-size: 0.85rem;
  color: rgba(255,255,255,0.7);
}

/* ============================================
   Why Choose Us
   ============================================ */
.why-us {
  background: var(--bg-section);
}

.advantage-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
}

.advantage-card {
  background: white;
  border-radius: var(--radius-lg);
  padding: 36px 28px;
  text-align: center;
  transition: all var(--transition);
  border: 1px solid var(--border);
}

.advantage-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--accent);
}

.advantage-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 20px;
  background: linear-gradient(135deg, var(--accent), var(--primary-light));
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
  color: white;
}

.advantage-card h3 {
  margin-bottom: 10px;
  font-size: 1.1rem;
}

.advantage-card p {
  color: var(--text-light);
  font-size: 0.88rem;
  line-height: 1.6;
}

/* ============================================
   Quality Section
   ============================================ */
.quality-process {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  margin-bottom: 60px;
}

.process-step {
  text-align: center;
  position: relative;
}

.process-step::after {
  content: '→';
  position: absolute;
  right: -16px;
  top: 36px;
  color: var(--accent);
  font-size: 1.4rem;
  font-weight: 700;
}

.process-step:last-child::after {
  display: none;
}

.step-number {
  width: 56px;
  height: 56px;
  margin: 0 auto 16px;
  background: linear-gradient(135deg, var(--accent), var(--primary));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 1.3rem;
  font-weight: 800;
}

.process-step h4 {
  margin-bottom: 8px;
  font-size: 1rem;
}

.process-step p {
  font-size: 0.85rem;
  color: var(--text-light);
  line-height: 1.5;
}

.quality-specs {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
}

.spec-card {
  background: var(--bg-light);
  border-radius: var(--radius);
  padding: 24px;
  border: 1px solid var(--border);
}

.spec-card h4 {
  color: var(--primary);
  margin-bottom: 12px;
  font-size: 1rem;
}

.spec-list {
  font-size: 0.88rem;
  line-height: 2;
}

.spec-list li::before {
  content: '✓';
  color: var(--success);
  font-weight: 700;
  margin-right: 8px;
}

/* ============================================
   CTA Banner
   ============================================ */
.cta-banner {
  background: linear-gradient(135deg, var(--primary), var(--primary-light), var(--accent));
  padding: 80px 0;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.cta-banner::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -20%;
  width: 60%;
  height: 200%;
  background: radial-gradient(ellipse, rgba(255,255,255,0.05), transparent);
}

.cta-banner h2 {
  color: white;
  margin-bottom: 16px;
}

.cta-banner p {
  color: rgba(255,255,255,0.8);
  font-size: 1.1rem;
  margin-bottom: 36px;
  max-width: 520px;
  margin-left: auto;
  margin-right: auto;
}

.cta-banner .btn-primary {
  font-size: 1.05rem;
  padding: 16px 40px;
}

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

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 48px;
}

.contact-info h3 {
  margin-bottom: 8px;
  font-size: 1.3rem;
}

.contact-info > p {
  color: var(--text-light);
  margin-bottom: 32px;
  line-height: 1.7;
}

.contact-item {
  display: flex;
  gap: 16px;
  margin-bottom: 24px;
  align-items: flex-start;
}

.contact-item .icon {
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  background: white;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  box-shadow: var(--shadow-sm);
}

.contact-item h4 {
  font-size: 0.88rem;
  color: var(--text-light);
  margin-bottom: 2px;
  font-weight: 500;
}

.contact-item p {
  font-size: 0.95rem;
  color: var(--text-dark);
  font-weight: 600;
}

.contact-form-box {
  background: white;
  border-radius: var(--radius-lg);
  padding: 40px;
  box-shadow: var(--shadow-md);
  border: 1px solid var(--border);
}

.contact-form-box h3 {
  margin-bottom: 24px;
}

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

.form-group {
  margin-bottom: 18px;
}

.form-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-dark);
  margin-bottom: 6px;
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 12px 16px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  font-size: 0.92rem;
  font-family: inherit;
  color: var(--text-dark);
  transition: border-color var(--transition);
  background: var(--bg-light);
}

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

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

.form-submit {
  width: 100%;
  padding: 14px;
  background: var(--accent);
  color: white;
  border: none;
  border-radius: var(--radius);
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  transition: background var(--transition);
}

.form-submit:hover {
  background: var(--accent-light);
}

/* ============================================
   Footer
   ============================================ */
.footer {
  background: var(--primary);
  color: rgba(255,255,255,0.7);
  padding: 60px 0 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  padding-bottom: 48px;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}

.footer-brand .nav-logo {
  color: white;
  margin-bottom: 16px;
}

.footer-brand p {
  font-size: 0.88rem;
  line-height: 1.7;
  max-width: 300px;
}

.footer h4 {
  color: white;
  font-size: 0.92rem;
  margin-bottom: 20px;
  font-weight: 700;
}

.footer-links a {
  display: block;
  font-size: 0.88rem;
  padding: 4px 0;
  color: rgba(255,255,255,0.6);
  transition: color var(--transition);
}

.footer-links a:hover {
  color: white;
}

.footer-bottom {
  padding: 24px 0;
  text-align: center;
  font-size: 0.82rem;
  color: rgba(255,255,255,0.4);
}

/* ============================================
   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);
}

.fade-in-delay-1 { transition-delay: 0.1s; }
.fade-in-delay-2 { transition-delay: 0.2s; }
.fade-in-delay-3 { transition-delay: 0.3s; }
.fade-in-delay-4 { transition-delay: 0.4s; }

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 1024px) {
  .about-grid {
    gap: 40px;
  }

  .quality-process {
    grid-template-columns: repeat(2, 1fr);
  }

  .process-step::after {
    display: none;
  }

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

@media (max-width: 768px) {
  section {
    padding: 72px 0;
  }

  .nav-links {
    position: fixed;
    top: 0;
    right: -100%;
    width: 280px;
    height: 100vh;
    background: white;
    flex-direction: column;
    padding: 80px 32px 32px;
    gap: 24px;
    box-shadow: var(--shadow-lg);
    transition: right var(--transition);
    z-index: 999;
  }

  .nav-links.active {
    right: 0;
  }

  .nav-toggle {
    display: flex;
    z-index: 1001;
  }

  .hero-stats {
    gap: 24px;
    flex-wrap: wrap;
  }

  .hero-stat .number {
    font-size: 1.5rem;
  }

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

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

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

  .quality-process {
    grid-template-columns: 1fr;
  }

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

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .hero-buttons {
    flex-direction: column;
  }

  .hero-buttons .btn {
    text-align: center;
    justify-content: center;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 16px;
  }

  .hero h1 {
    font-size: 1.8rem;
  }

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

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