/* ============================================
   ZW Technology - Global Styles
   ============================================ */

:root {
  --primary: #0f172a;
  --primary-light: #1e293b;
  --accent: #2563eb;
  --accent-dark: #1d4ed8;
  --text: #333;
  --text-light: #666;
  --bg: #ffffff;
  --bg-light: #f7f8fa;
  --bg-dark: #eaecef;
  --success: #067d62;
  --border: #ddd;
  --shadow: 0 2px 12px rgba(0,0,0,0.08);
  --radius: 8px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  color: var(--text);
  line-height: 1.6;
  background: var(--bg);
}

a {
  text-decoration: none;
  color: inherit;
  transition: color 0.3s;
}

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

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

/* ============================================
   Header & Navigation
   ============================================ */

header {
  background: var(--primary);
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: 0 2px 8px rgba(0,0,0,0.15);
}

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

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
}

.logo-icon {
  width: 40px;
  height: 40px;
  background: var(--accent);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  font-weight: 700;
  color: var(--primary);
}

.logo-text {
  color: #fff;
  font-size: 22px;
  font-weight: 700;
  letter-spacing: 0.5px;
}

.logo-text span {
  color: var(--accent);
}

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

nav a {
  color: #ccc;
  font-size: 15px;
  font-weight: 500;
  padding: 8px 0;
  border-bottom: 2px solid transparent;
  transition: all 0.3s;
}

nav a:hover,
nav a.active {
  color: #fff;
  border-bottom-color: var(--accent);
}

.nav-cta {
  background: var(--accent);
  color: #fff !important;
  padding: 10px 24px !important;
  border-radius: 6px;
  font-weight: 600 !important;
  border: none !important;
}

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

.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  color: #fff;
  font-size: 28px;
  cursor: pointer;
}

/* ============================================
   Hero Section
   ============================================ */

.hero {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
  padding: 100px 0 80px;
  position: relative;
  overflow: hidden;
}

.hero::after {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(37,99,235,0.1) 0%, transparent 70%);
  border-radius: 50%;
}

.hero .container {
  display: flex;
  align-items: center;
  gap: 60px;
  position: relative;
  z-index: 1;
}

.hero-content {
  flex: 1;
}

.hero-content h1 {
  color: #fff;
  font-size: 48px;
  line-height: 1.2;
  margin-bottom: 20px;
  font-weight: 800;
}

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

.hero-content p {
  color: #b0bec5;
  font-size: 18px;
  margin-bottom: 36px;
  max-width: 520px;
}

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

.btn-primary {
  background: var(--accent);
  color: #fff;
  padding: 14px 32px;
  border-radius: 6px;
  font-size: 16px;
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: all 0.3s;
  border: none;
  cursor: pointer;
}

.btn-primary:hover {
  background: var(--accent-dark);
  transform: translateY(-2px);
  box-shadow: 0 4px 16px rgba(37,99,235,0.3);
}

.btn-secondary {
  background: transparent;
  color: #fff;
  padding: 14px 32px;
  border-radius: 6px;
  font-size: 16px;
  font-weight: 600;
  border: 2px solid rgba(255,255,255,0.3);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: all 0.3s;
  cursor: pointer;
}

.btn-secondary:hover {
  border-color: #fff;
  background: rgba(255,255,255,0.1);
}

.hero-visual {
  flex: 1;
  display: flex;
  justify-content: center;
}

.hero-dashboard {
  background: #fff;
  border-radius: 16px;
  padding: 24px;
  box-shadow: 0 20px 60px rgba(0,0,0,0.3);
  width: 480px;
}

.dashboard-header {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 20px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--bg-dark);
}

.dashboard-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.dot-red { background: #ff5f57; }
.dot-yellow { background: #febc2e; }
.dot-green { background: #28c840; }

.dashboard-title {
  margin-left: 8px;
  font-size: 13px;
  color: var(--text-light);
}

.dashboard-metrics {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-bottom: 16px;
}

.metric-card {
  background: var(--bg-light);
  border-radius: 8px;
  padding: 16px;
}

.metric-label {
  font-size: 12px;
  color: var(--text-light);
  margin-bottom: 4px;
}

.metric-value {
  font-size: 24px;
  font-weight: 700;
  color: var(--primary);
}

.metric-change {
  font-size: 12px;
  font-weight: 600;
}

.metric-change.up { color: var(--success); }
.metric-change.down { color: #d13212; }

.dashboard-chart {
  background: var(--bg-light);
  border-radius: 8px;
  padding: 16px;
  height: 120px;
  display: flex;
  align-items: flex-end;
  gap: 6px;
}

.chart-bar {
  flex: 1;
  background: var(--accent);
  border-radius: 4px 4px 0 0;
  opacity: 0.7;
  transition: opacity 0.3s;
}

.chart-bar:hover { opacity: 1; }

/* ============================================
   Stats Bar
   ============================================ */

.stats-bar {
  background: var(--bg-light);
  padding: 40px 0;
  border-bottom: 1px solid var(--bg-dark);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
  text-align: center;
}

.stat-item h3 {
  font-size: 36px;
  font-weight: 800;
  color: var(--accent);
  margin-bottom: 4px;
}

.stat-item p {
  font-size: 14px;
  color: var(--text-light);
}

/* ============================================
   Section Common Styles
   ============================================ */

.section {
  padding: 80px 0;
}

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

.section-header h2 {
  font-size: 36px;
  color: var(--primary);
  margin-bottom: 12px;
}

.section-header p {
  font-size: 18px;
  color: var(--text-light);
  max-width: 600px;
  margin: 0 auto;
}

.section-tag {
  display: inline-block;
  background: rgba(37,99,235,0.1);
  color: var(--accent-dark);
  padding: 4px 16px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 12px;
  text-transform: uppercase;
  letter-spacing: 1px;
}

/* ============================================
   Products Section
   ============================================ */

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

.product-card {
  background: #fff;
  border: 1px solid var(--bg-dark);
  border-radius: var(--radius);
  padding: 32px;
  transition: all 0.3s;
  position: relative;
  overflow: hidden;
}

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

.product-icon {
  width: 56px;
  height: 56px;
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  margin-bottom: 20px;
}

.product-card h3 {
  font-size: 20px;
  color: var(--primary);
  margin-bottom: 12px;
}

.product-card p {
  color: var(--text-light);
  font-size: 15px;
  line-height: 1.7;
}

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

.product-features li {
  list-style: none;
  padding: 4px 0;
  font-size: 14px;
  color: var(--text);
  display: flex;
  align-items: center;
  gap: 8px;
}

.product-features li::before {
  content: '✓';
  color: var(--success);
  font-weight: 700;
}

/* ============================================
   How It Works
   ============================================ */

.how-it-works {
  background: var(--bg-light);
}

.steps-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
  position: relative;
}

.steps-grid::before {
  content: '';
  position: absolute;
  top: 40px;
  left: 15%;
  right: 15%;
  height: 2px;
  background: var(--bg-dark);
}

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

.step-number {
  width: 80px;
  height: 80px;
  background: #fff;
  border: 3px solid var(--accent);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 28px;
  font-weight: 800;
  color: var(--accent);
  margin: 0 auto 20px;
  position: relative;
  z-index: 1;
}

.step-item h3 {
  font-size: 18px;
  color: var(--primary);
  margin-bottom: 8px;
}

.step-item p {
  font-size: 14px;
  color: var(--text-light);
}

/* ============================================
   Technology Section
   ============================================ */

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

.tech-list {
  list-style: none;
}

.tech-list li {
  display: flex;
  gap: 16px;
  padding: 20px 0;
  border-bottom: 1px solid var(--bg-dark);
}

.tech-list li:last-child {
  border: none;
}

.tech-icon {
  width: 48px;
  height: 48px;
  background: rgba(37,99,235,0.1);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  flex-shrink: 0;
}

.tech-info h4 {
  font-size: 16px;
  color: var(--primary);
  margin-bottom: 4px;
}

.tech-info p {
  font-size: 14px;
  color: var(--text-light);
}

.tech-visual {
  background: var(--primary);
  border-radius: 16px;
  padding: 32px;
  color: #fff;
}

.code-block {
  background: rgba(0,0,0,0.3);
  border-radius: 8px;
  padding: 20px;
  font-family: 'Menlo', 'Monaco', 'Courier New', monospace;
  font-size: 13px;
  line-height: 1.8;
  overflow-x: auto;
}

.code-comment { color: #6a9955; }
.code-keyword { color: #569cd6; }
.code-string { color: #ce9178; }
.code-func { color: #dcdcaa; }
.code-number { color: #b5cea8; }

/* ============================================
   API Integration Section
   ============================================ */

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

.api-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.api-card {
  background: #fff;
  border-radius: var(--radius);
  padding: 28px;
  border: 1px solid var(--bg-dark);
  display: flex;
  gap: 16px;
  transition: all 0.3s;
}

.api-card:hover {
  box-shadow: var(--shadow);
  border-color: var(--accent);
}

.api-badge {
  width: 44px;
  height: 44px;
  background: var(--primary);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
  font-size: 18px;
  flex-shrink: 0;
}

.api-card h4 {
  font-size: 16px;
  color: var(--primary);
  margin-bottom: 6px;
}

.api-card p {
  font-size: 14px;
  color: var(--text-light);
  line-height: 1.6;
}

/* ============================================
   Testimonials
   ============================================ */

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

.testimonial-card {
  background: #fff;
  border: 1px solid var(--bg-dark);
  border-radius: var(--radius);
  padding: 28px;
}

.testimonial-stars {
  color: var(--accent);
  font-size: 16px;
  margin-bottom: 12px;
}

.testimonial-text {
  font-size: 15px;
  color: var(--text);
  line-height: 1.7;
  margin-bottom: 20px;
  font-style: italic;
}

.testimonial-author {
  display: flex;
  align-items: center;
  gap: 12px;
}

.author-avatar {
  width: 44px;
  height: 44px;
  background: var(--primary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
  font-weight: 700;
  font-size: 16px;
}

.author-info h5 {
  font-size: 14px;
  color: var(--primary);
}

.author-info p {
  font-size: 12px;
  color: var(--text-light);
}

/* ============================================
   CTA Section
   ============================================ */

.cta-section {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
  padding: 80px 0;
  text-align: center;
}

.cta-section h2 {
  color: #fff;
  font-size: 36px;
  margin-bottom: 16px;
}

.cta-section p {
  color: #b0bec5;
  font-size: 18px;
  margin-bottom: 32px;
  max-width: 560px;
  margin-left: auto;
  margin-right: auto;
}

/* ============================================
   Footer
   ============================================ */

footer {
  background: var(--primary);
  color: #8899a6;
  padding: 60px 0 30px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}

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

.footer-brand p {
  font-size: 14px;
  line-height: 1.7;
  max-width: 300px;
}

.footer-col h4 {
  color: #fff;
  font-size: 16px;
  margin-bottom: 16px;
}

.footer-col ul {
  list-style: none;
}

.footer-col li {
  padding: 4px 0;
}

.footer-col a {
  font-size: 14px;
  color: #8899a6;
  transition: color 0.3s;
}

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

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 13px;
}

.footer-bottom a {
  color: #8899a6;
  margin-left: 24px;
}

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

/* ============================================
   About Page
   ============================================ */

.page-hero {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
  padding: 60px 0;
  text-align: center;
}

.page-hero h1 {
  color: #fff;
  font-size: 42px;
  margin-bottom: 12px;
}

.page-hero p {
  color: #b0bec5;
  font-size: 18px;
}

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

.about-mission h2 {
  font-size: 32px;
  color: var(--primary);
  margin-bottom: 16px;
}

.about-mission p {
  color: var(--text-light);
  font-size: 16px;
  line-height: 1.8;
  margin-bottom: 16px;
}

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

.value-card {
  text-align: center;
  padding: 32px;
  background: var(--bg-light);
  border-radius: var(--radius);
}

.value-icon {
  width: 64px;
  height: 64px;
  background: rgba(37,99,235,0.1);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 28px;
  margin: 0 auto 16px;
}

.value-card h3 {
  font-size: 18px;
  color: var(--primary);
  margin-bottom: 8px;
}

.value-card p {
  font-size: 14px;
  color: var(--text-light);
}

.team-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.team-card {
  text-align: center;
  padding: 24px;
}

.team-avatar {
  width: 100px;
  height: 100px;
  background: var(--primary);
  border-radius: 50%;
  margin: 0 auto 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
  font-size: 36px;
  font-weight: 700;
}

.team-card h4 {
  font-size: 16px;
  color: var(--primary);
  margin-bottom: 4px;
}

.team-card p {
  font-size: 13px;
  color: var(--text-light);
}

/* ============================================
   Contact Page
   ============================================ */

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

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

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

.form-group label {
  display: block;
  font-size: 14px;
  font-weight: 600;
  color: var(--primary);
  margin-bottom: 6px;
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 15px;
  color: var(--text);
  transition: border-color 0.3s;
  font-family: inherit;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(37,99,235,0.1);
}

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

.form-submit {
  width: 100%;
}

.contact-info {
  padding: 20px 0;
}

.contact-info h3 {
  font-size: 24px;
  color: var(--primary);
  margin-bottom: 24px;
}

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

.info-icon {
  width: 44px;
  height: 44px;
  background: rgba(37,99,235,0.1);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  flex-shrink: 0;
}

.info-item h4 {
  font-size: 15px;
  color: var(--primary);
  margin-bottom: 4px;
}

.info-item p {
  font-size: 14px;
  color: var(--text-light);
}

/* ============================================
   Privacy & Terms Pages
   ============================================ */

.legal-content {
  max-width: 800px;
  margin: 0 auto;
  padding: 60px 24px;
}

.legal-content h1 {
  font-size: 36px;
  color: var(--primary);
  margin-bottom: 8px;
}

.legal-content .update-date {
  color: var(--text-light);
  font-size: 14px;
  margin-bottom: 32px;
}

.legal-content h2 {
  font-size: 22px;
  color: var(--primary);
  margin-top: 32px;
  margin-bottom: 12px;
}

.legal-content p {
  color: var(--text);
  font-size: 15px;
  line-height: 1.8;
  margin-bottom: 16px;
}

.legal-content ul {
  margin: 12px 0 16px 24px;
  color: var(--text);
  font-size: 15px;
  line-height: 1.8;
}

/* ============================================
   Responsive
   ============================================ */

@media (max-width: 1024px) {
  .hero .container {
    flex-direction: column;
    text-align: center;
  }
  .hero-content p { margin: 0 auto 36px; }
  .hero-buttons { justify-content: center; }
  .hero-dashboard { width: 100%; max-width: 480px; }
  .products-grid { grid-template-columns: repeat(2, 1fr); }
  .steps-grid { grid-template-columns: repeat(2, 1fr); gap: 40px; }
  .steps-grid::before { display: none; }
  .tech-content { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .team-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .mobile-menu-btn { display: block; }
  nav { display: none; flex-direction: column; position: absolute; top: 72px; left: 0; right: 0; background: var(--primary); padding: 20px; gap: 16px; }
  nav.active { display: flex; }
  .hero-content h1 { font-size: 32px; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .products-grid { grid-template-columns: 1fr; }
  .testimonials-grid { grid-template-columns: 1fr; }
  .api-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .about-mission { grid-template-columns: 1fr; }
  .values-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; gap: 12px; }
  .page-hero h1 { font-size: 32px; }
}

@media (max-width: 480px) {
  .hero-content h1 { font-size: 28px; }
  .hero-buttons { flex-direction: column; }
  .stats-grid { grid-template-columns: 1fr; }
  .section { padding: 60px 0; }
}

/* ============================================
   Language Switcher
   ============================================ */

.lang-switcher {
  position: relative;
  margin-left: 8px;
}

.lang-btn {
  background: rgba(255,255,255,0.1);
  color: #fff;
  border: 1px solid rgba(255,255,255,0.2);
  padding: 6px 14px;
  border-radius: 6px;
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 6px;
  transition: all 0.3s;
}

.lang-btn:hover {
  background: rgba(255,255,255,0.2);
}

.lang-dropdown {
  display: none;
  position: absolute;
  top: 100%;
  right: 0;
  background: #fff;
  border-radius: 8px;
  box-shadow: 0 8px 24px rgba(0,0,0,0.15);
  min-width: 160px;
  z-index: 1001;
  overflow: hidden;
}

.lang-switcher::after {
  content: '';
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  height: 12px;
}

.lang-switcher:hover .lang-dropdown {
  display: block;
}

.lang-dropdown a {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 16px;
  font-size: 14px;
  color: var(--text);
  transition: background 0.2s;
}

.lang-dropdown a:hover {
  background: var(--bg-light);
  color: var(--text);
}

.lang-dropdown a.active {
  background: rgba(37,99,235,0.1);
  color: #1d4ed8;
  font-weight: 600;
}

@media (max-width: 768px) {
  .lang-switcher {
    margin-left: 0;
    align-self: flex-start;
  }
  .lang-dropdown {
    position: static;
    display: none;
    background: rgba(255,255,255,0.1);
    box-shadow: none;
    margin-top: 4px;
    border-radius: 6px;
  }
  .lang-switcher:hover .lang-dropdown {
    display: block;
  }
  .lang-dropdown a {
    color: #ccc;
  }
  .lang-dropdown a:hover {
    background: rgba(255,255,255,0.1);
  }
  .lang-dropdown a.active {
    color: var(--accent);
    background: rgba(37,99,235,0.1);
  }
}