/* ===== CSS Variables ===== */
:root {
  --bg-primary: #FFFFFF;
  --bg-secondary: #F8FAFC;
  --bg-tertiary: #F1F5F9;

  --text-primary: #0F172A;
  --text-secondary: #475569;
  --text-muted: #94A3B8;

  --accent-blue: #1890FF;
  --accent-purple: #7C3AED;
  --accent-cyan: #06B6D4;
  --accent-pink: #EC4899;

  --gradient-hero: linear-gradient(135deg, #667EEA 0%, #764BA2 50%, #F093FB 100%);
  --gradient-btn: linear-gradient(135deg, #1890FF 0%, #7C3AED 100%);
  --gradient-card: linear-gradient(180deg, rgba(24, 144, 255, 0.03) 0%, rgba(124, 58, 237, 0.03) 100%);

  --border-color: #E2E8F0;
  --border-light: rgba(0, 0, 0, 0.06);

  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  --shadow-xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
  --shadow-glow: 0 0 60px rgba(24, 144, 255, 0.3);
  --shadow-purple: 0 20px 40px rgba(124, 58, 237, 0.15);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  overflow-x: hidden;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
  text-decoration: none;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

ul {
  list-style: none;
}

/* ===== Layout ===== */
.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 32px;
}

/* ===== Navigation ===== */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid var(--border-light);
  transition: all 0.3s ease;
}

.nav.scrolled {
  box-shadow: var(--shadow-md);
}

.nav-container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 16px 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.5rem;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.logo-icon {
  width: 36px;
  height: 36px;
  transition: transform 0.3s ease;
}

.logo:hover .logo-icon {
  transform: rotate(-10deg) scale(1.1);
}

.nav-links {
  display: flex;
  gap: 40px;
}

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

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--gradient-btn);
  border-radius: 2px;
  transition: width 0.3s ease;
}

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

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

.nav-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

.lang-switch {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 8px 14px;
  background: transparent;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.3s ease;
}

.lang-switch:hover {
  border-color: var(--accent-blue);
  color: var(--accent-blue);
  background: rgba(24, 144, 255, 0.05);
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.95rem;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  cursor: pointer;
  border: none;
  position: relative;
  overflow: hidden;
}

.btn-sm {
  padding: 10px 20px;
  font-size: 0.875rem;
}

.btn-lg {
  padding: 18px 36px;
  font-size: 1rem;
  border-radius: var(--radius-md);
}

.btn-primary {
  background: var(--gradient-btn);
  color: #FFFFFF;
  box-shadow: 0 4px 14px rgba(24, 144, 255, 0.4);
}

.btn-primary::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
  transition: left 0.5s ease;
}

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 25px rgba(24, 144, 255, 0.5);
}

.btn-primary:hover::before {
  left: 100%;
}

.btn-secondary {
  background: var(--bg-primary);
  color: var(--text-primary);
  border: 2px solid var(--border-color);
}

.btn-secondary:hover {
  background: var(--bg-secondary);
  border-color: var(--accent-blue);
  color: var(--accent-blue);
}

.btn-block {
  width: 100%;
}

.play-icon {
  font-size: 0.75rem;
}

/* ===== Hero Section ===== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 140px 0 100px;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 100% 80% at 50% -30%, rgba(124, 58, 237, 0.12), transparent 60%),
    radial-gradient(ellipse 80% 60% at 100% 50%, rgba(6, 182, 212, 0.08), transparent 50%),
    radial-gradient(ellipse 60% 50% at 0% 80%, rgba(236, 72, 153, 0.06), transparent 50%);
  pointer-events: none;
}

.hero-bg::before {
  content: '';
  position: absolute;
  top: 20%;
  left: 10%;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(24, 144, 255, 0.1) 0%, transparent 70%);
  border-radius: 50%;
  filter: blur(60px);
  animation: float 8s ease-in-out infinite;
}

.hero-bg::after {
  content: '';
  position: absolute;
  bottom: 20%;
  right: 10%;
  width: 300px;
  height: 300px;
  background: radial-gradient(circle, rgba(124, 58, 237, 0.1) 0%, transparent 70%);
  border-radius: 50%;
  filter: blur(60px);
  animation: float 6s ease-in-out infinite reverse;
}

@keyframes float {
  0%, 100% { transform: translateY(0) scale(1); }
  50% { transform: translateY(-30px) scale(1.05); }
}

.hero .container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}

.hero-content {
  position: relative;
  z-index: 1;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  background: linear-gradient(135deg, rgba(24, 144, 255, 0.1), rgba(124, 58, 237, 0.1));
  border: 1px solid rgba(24, 144, 255, 0.2);
  border-radius: 100px;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--accent-blue);
  margin-bottom: 28px;
  animation: pulse 3s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(24, 144, 255, 0.2); }
  50% { box-shadow: 0 0 0 10px rgba(24, 144, 255, 0); }
}

.hero h1 {
  font-size: 4rem;
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: 28px;
  letter-spacing: -0.03em;
}

.gradient-text {
  background: var(--gradient-hero);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  background-size: 200% 200%;
  animation: gradient-shift 5s ease infinite;
}

@keyframes gradient-shift {
  0%, 100% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
}

.hero-desc {
  font-size: 1.25rem;
  color: var(--text-secondary);
  margin-bottom: 40px;
  max-width: 520px;
  line-height: 1.8;
}

.hero-actions {
  display: flex;
  gap: 16px;
  margin-bottom: 60px;
}

.hero-stats {
  display: flex;
  gap: 48px;
  padding-top: 32px;
  border-top: 1px solid var(--border-color);
}

.stat {
  display: flex;
  flex-direction: column;
}

.stat-value {
  font-size: 2rem;
  font-weight: 800;
  background: var(--gradient-btn);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stat-label {
  font-size: 0.875rem;
  color: var(--text-muted);
  font-weight: 500;
}

/* Workflow Preview */
.hero-visual {
  position: relative;
  perspective: 1000px;
}

.workflow-preview {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0;
  padding: 48px;
  background: linear-gradient(180deg, #FFFFFF 0%, #F8FAFC 100%);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg), 0 0 0 1px rgba(0,0,0,0.02);
  transform: rotateY(-5deg) rotateX(5deg);
  transition: transform 0.5s ease;
}

.workflow-preview:hover {
  transform: rotateY(0) rotateX(0);
}

.workflow-node {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 18px 28px;
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  font-size: 0.95rem;
  font-weight: 500;
  min-width: 220px;
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: var(--shadow-sm);
}

.workflow-node:hover {
  border-color: var(--accent-blue);
  box-shadow: var(--shadow-md), 0 0 0 4px rgba(24, 144, 255, 0.1);
  transform: translateX(8px);
}

.node-trigger {
  border-left: 4px solid var(--accent-purple);
  background: linear-gradient(90deg, rgba(124, 58, 237, 0.05), transparent);
}

.node-icon {
  font-size: 1.5rem;
}

.workflow-line {
  width: 3px;
  height: 28px;
  background: linear-gradient(180deg, var(--accent-blue), var(--accent-purple));
  border-radius: 3px;
}

/* ===== Section Styles ===== */
section {
  padding: 120px 0;
  position: relative;
}

.section-header {
  text-align: center;
  margin-bottom: 80px;
}

.section-header h2 {
  font-size: 3rem;
  font-weight: 800;
  margin-bottom: 20px;
  letter-spacing: -0.02em;
}

.section-header p {
  font-size: 1.25rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

/* ===== Features ===== */
.features {
  background: var(--bg-secondary);
  position: relative;
}

.features::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--border-color), transparent);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.feature-card {
  padding: 40px;
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--gradient-btn);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.4s ease;
}

.feature-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-xl);
  border-color: transparent;
}

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

.feature-icon {
  font-size: 3rem;
  margin-bottom: 24px;
  display: block;
}

.feature-card h3 {
  font-size: 1.375rem;
  font-weight: 700;
  margin-bottom: 14px;
  letter-spacing: -0.01em;
}

.feature-card p {
  color: var(--text-secondary);
  font-size: 1rem;
  line-height: 1.7;
}

/* ===== How it Works ===== */
.steps {
  display: flex;
  align-items: flex-start;
  justify-content: center;
  gap: 0;
  position: relative;
}

.step {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  max-width: 320px;
  padding: 0 24px;
}

.step-number {
  width: 80px;
  height: 80px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--gradient-btn);
  color: #FFFFFF;
  font-size: 1.75rem;
  font-weight: 800;
  border-radius: 50%;
  margin-bottom: 32px;
  box-shadow: var(--shadow-purple);
  position: relative;
}

.step-number::after {
  content: '';
  position: absolute;
  inset: -6px;
  border: 2px dashed rgba(124, 58, 237, 0.3);
  border-radius: 50%;
  animation: spin 20s linear infinite;
}

@keyframes spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

.step-content h3 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 14px;
}

.step-content p {
  color: var(--text-secondary);
  font-size: 1rem;
  line-height: 1.7;
}

.step-connector {
  width: 120px;
  height: 3px;
  background: linear-gradient(90deg, var(--accent-blue), var(--accent-purple));
  margin-top: 40px;
  border-radius: 3px;
  position: relative;
}

.step-connector::after {
  content: '';
  position: absolute;
  right: -6px;
  top: -4px;
  width: 10px;
  height: 10px;
  background: var(--accent-purple);
  border-radius: 50%;
}

/* ===== Architecture ===== */
.architecture {
  background: var(--bg-secondary);
}

.arch-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}

.arch-text h2 {
  font-size: 3rem;
  font-weight: 800;
  margin-bottom: 28px;
  letter-spacing: -0.02em;
}

.arch-text > p {
  color: var(--text-secondary);
  font-size: 1.25rem;
  margin-bottom: 40px;
  line-height: 1.8;
}

.arch-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.arch-list li {
  display: flex;
  align-items: center;
  gap: 16px;
  font-size: 1.1rem;
  font-weight: 500;
}

.check {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  background: linear-gradient(135deg, rgba(24, 144, 255, 0.1), rgba(124, 58, 237, 0.1));
  color: var(--accent-blue);
  font-weight: 700;
  border-radius: 50%;
  font-size: 0.875rem;
}

.arch-diagram {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
}

.arch-box {
  width: 100%;
  max-width: 360px;
  padding: 28px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  background: var(--bg-primary);
  box-shadow: var(--shadow-md);
}

.arch-cloud {
  background: linear-gradient(135deg, rgba(124, 58, 237, 0.05), rgba(124, 58, 237, 0.02));
  border-color: rgba(124, 58, 237, 0.2);
}

.arch-local {
  background: linear-gradient(135deg, rgba(24, 144, 255, 0.05), rgba(24, 144, 255, 0.02));
  border-color: rgba(24, 144, 255, 0.2);
}

.arch-label {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  margin-bottom: 20px;
  padding: 6px 12px;
  background: var(--bg-secondary);
  border-radius: 100px;
}

.arch-item {
  padding: 14px 18px;
  background: var(--bg-secondary);
  border-radius: var(--radius-sm);
  margin-bottom: 10px;
  font-size: 0.95rem;
  font-weight: 500;
  border: 1px solid var(--border-color);
  transition: all 0.3s ease;
}

.arch-item:hover {
  background: var(--bg-primary);
  border-color: var(--accent-blue);
}

.arch-item:last-child {
  margin-bottom: 0;
}

.arch-arrow {
  font-size: 2rem;
  color: var(--accent-purple);
  animation: bounce 2s ease-in-out infinite;
}

@keyframes bounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(5px); }
}

/* ===== Pricing ===== */
.pricing-cards {
  display: flex;
  justify-content: center;
  gap: 40px;
}

.pricing-card {
  position: relative;
  width: 100%;
  max-width: 400px;
  padding: 48px;
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.pricing-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-xl);
}

.pricing-card.featured {
  border: 2px solid transparent;
  background: linear-gradient(var(--bg-primary), var(--bg-primary)) padding-box,
              var(--gradient-btn) border-box;
  box-shadow: var(--shadow-purple);
}

.pricing-badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  padding: 8px 24px;
  background: var(--gradient-btn);
  color: #FFFFFF;
  font-size: 0.8rem;
  font-weight: 700;
  border-radius: 100px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  box-shadow: 0 4px 14px rgba(124, 58, 237, 0.4);
}

.pricing-header {
  text-align: center;
  margin-bottom: 40px;
}

.pricing-header h3 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.price {
  font-size: 4rem;
  font-weight: 800;
  letter-spacing: -0.03em;
}

.price span {
  font-size: 1.125rem;
  font-weight: 500;
  color: var(--text-muted);
}

.pricing-features {
  margin-bottom: 40px;
}

.pricing-features li {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px 0;
  border-bottom: 1px solid var(--border-color);
  font-size: 1rem;
}

.pricing-features li:last-child {
  border-bottom: none;
}

/* ===== CTA ===== */
.cta {
  background: linear-gradient(135deg, var(--bg-secondary) 0%, #EEF2FF 100%);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.cta::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(124, 58, 237, 0.05) 0%, transparent 50%);
  animation: rotate 30s linear infinite;
}

@keyframes rotate {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

.cta-content {
  position: relative;
  z-index: 1;
}

.cta-content h2 {
  font-size: 3rem;
  font-weight: 800;
  margin-bottom: 20px;
  letter-spacing: -0.02em;
}

.cta-content p {
  font-size: 1.25rem;
  color: var(--text-secondary);
  margin-bottom: 40px;
}

/* ===== Footer ===== */
.footer {
  padding: 80px 0 32px;
  background: var(--bg-primary);
  border-top: 1px solid var(--border-color);
}

.footer-content {
  display: grid;
  grid-template-columns: 1.5fr 2fr;
  gap: 80px;
  margin-bottom: 60px;
}

.footer-brand p {
  color: var(--text-secondary);
  margin-top: 20px;
  font-size: 1rem;
  line-height: 1.7;
}

.footer-links {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 40px;
}

.footer-col h4 {
  font-size: 0.875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-primary);
  margin-bottom: 24px;
}

.footer-col a {
  display: block;
  color: var(--text-secondary);
  font-size: 0.95rem;
  padding: 8px 0;
}

.footer-col a:hover {
  color: var(--accent-blue);
  transform: translateX(4px);
}

.footer-bottom {
  text-align: center;
  padding-top: 32px;
  border-top: 1px solid var(--border-color);
}

.footer-bottom p {
  color: var(--text-muted);
  font-size: 0.875rem;
}

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .hero .container {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .hero-content {
    order: 1;
  }

  .hero-visual {
    order: 2;
  }

  .hero-desc {
    margin-left: auto;
    margin-right: auto;
  }

  .hero-actions {
    justify-content: center;
  }

  .hero-stats {
    justify-content: center;
  }

  .workflow-preview {
    transform: none;
  }

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

  .arch-content {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .arch-list {
    align-items: center;
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
  }

  .hero h1 {
    font-size: 2.75rem;
  }

  .section-header h2 {
    font-size: 2.25rem;
  }

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

  .steps {
    flex-direction: column;
    gap: 48px;
  }

  .step-connector {
    width: 3px;
    height: 60px;
    margin: 0;
  }

  .step-connector::after {
    right: -4px;
    top: auto;
    bottom: -6px;
  }

  .pricing-cards {
    flex-direction: column;
    align-items: center;
  }

  .footer-content {
    grid-template-columns: 1fr;
    text-align: center;
  }

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

@media (max-width: 480px) {
  .hero h1 {
    font-size: 2.25rem;
  }

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

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

  .section-header h2 {
    font-size: 1.875rem;
  }

  .cta-content h2 {
    font-size: 2rem;
  }
}