/* ========================================
   CSS Variables & Root Styles
   ======================================== */

:root {
  --color-primary: #0ea5e9;
  --color-primary-dark: #0284c7;
  --color-secondary: #1e293b;
  --color-bg-light: #f8fafc;
  --color-bg-dark: #0f172a;
  --color-text-dark: #1e293b;
  --color-text-light: #64748b;
  --color-border: #e2e8f0;
  --color-white: #ffffff;
  
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-size-base: 16px;
  --font-size-sm: 14px;
  --font-size-lg: 18px;
  --font-size-xl: 20px;
  --font-size-2xl: 24px;
  --font-size-3xl: 32px;
  --font-size-4xl: 48px;
  
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  --spacing-2xl: 48px;
  
  --border-radius-sm: 4px;
  --border-radius-md: 8px;
  --border-radius-lg: 12px;
  --border-radius-xl: 16px;
  
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
  
  --transition-fast: 150ms ease-in-out;
  --transition-normal: 300ms ease-in-out;
}

/* ========================================
   Global Styles
   ======================================== */

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--color-text-dark);
  background-color: var(--color-white);
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

/* ========================================
   Reading Progress Bar
   ======================================== */

.reading-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background-color: var(--color-border);
  z-index: 1000;
}

.reading-progress-bar {
  height: 100%;
  background: linear-gradient(90deg, var(--color-primary), var(--color-primary-dark));
  width: 0%;
  transition: width var(--transition-fast);
}

/* ========================================
   Header Styles
   ======================================== */

.site-header {
  background-color: var(--color-white);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-top {
  border-bottom: 1px solid var(--color-border);
  padding: var(--spacing-md) 0;
}

.header-top-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--spacing-lg);
}

.brand-logo-img {
  flex-shrink: 0;
}

.logo-image {
  height: 40px;
  width: auto;
  max-width: 150px;
}

.header-top-right {
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
}

.lang-wrap {
  position: relative;
}

.lang-button {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  background: none;
  border: 1px solid var(--color-border);
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--border-radius-md);
  cursor: pointer;
  font-size: var(--font-size-sm);
  color: var(--color-text-dark);
  transition: all var(--transition-fast);
}

.lang-button:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.lang-icon {
  width: 18px;
  height: 18px;
}

.lang-menu {
  position: absolute;
  top: 100%;
  right: 0;
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-md);
  box-shadow: var(--shadow-lg);
  min-width: 150px;
  display: none;
  flex-direction: column;
  z-index: 200;
  margin-top: var(--spacing-sm);
}

.lang-wrap[data-open="true"] .lang-menu {
  display: flex;
}

.lang-option {
  padding: var(--spacing-md) var(--spacing-lg);
  background: none;
  border: none;
  text-align: left;
  cursor: pointer;
  font-size: var(--font-size-sm);
  color: var(--color-text-dark);
  transition: all var(--transition-fast);
}

.lang-option:hover {
  background-color: var(--color-bg-light);
  color: var(--color-primary);
}

.crm-button {
  padding: var(--spacing-sm) var(--spacing-lg);
  background-color: var(--color-primary);
  color: var(--color-white);
  border: none;
  border-radius: var(--border-radius-md);
  text-decoration: none;
  font-size: var(--font-size-sm);
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.crm-button:hover {
  background-color: var(--color-primary-dark);
}

/* ========================================
   Navigation
   ======================================== */

.site-nav {
  background-color: var(--color-white);
  padding: var(--spacing-md) 0;
}

.nav-links {
  display: flex;
  gap: var(--spacing-lg);
  justify-content: flex-start;
  flex-wrap: nowrap;
  overflow-x: auto;
}

.nav-link {
  padding: var(--spacing-sm) var(--spacing-md);
  color: var(--color-text-dark);
  text-decoration: none;
  font-size: var(--font-size-sm);
  font-weight: 500;
  white-space: nowrap;
  transition: all var(--transition-fast);
  border-bottom: 2px solid transparent;
}

.nav-link:hover {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

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

.hero {
  background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
  color: var(--color-white);
  padding: var(--spacing-2xl) var(--spacing-lg);
  text-align: center;
  min-height: 400px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero-title {
  font-size: var(--font-size-4xl);
  font-weight: 800;
  margin-bottom: var(--spacing-md);
}

.hero-subtitle {
  font-size: var(--font-size-2xl);
  font-weight: 600;
  margin-bottom: var(--spacing-md);
  color: #cbd5e1;
}

.hero-description {
  font-size: var(--font-size-lg);
  max-width: 600px;
  margin: 0 auto var(--spacing-xl);
  color: #cbd5e1;
}

.hero-actions {
  display: flex;
  gap: var(--spacing-lg);
  justify-content: center;
  flex-wrap: wrap;
}

/* ========================================
   Main Content
   ======================================== */

.main-content {
  padding: var(--spacing-2xl) 0;
}

.content-section {
  margin-bottom: var(--spacing-2xl);
  padding: var(--spacing-2xl) 0;
  border-bottom: 1px solid var(--color-border);
}

.content-section:last-child {
  border-bottom: none;
}

.section-header {
  margin-bottom: var(--spacing-2xl);
}

.section-main-title {
  font-size: var(--font-size-3xl);
  font-weight: 800;
  color: var(--color-text-dark);
  margin-bottom: var(--spacing-md);
}

.section-sub-title {
  font-size: var(--font-size-lg);
  color: var(--color-text-light);
  font-weight: 500;
}

.section-content {
  line-height: 1.8;
}

.section-content > p {
  margin-bottom: var(--spacing-lg);
  color: var(--color-text-light);
}

/* ========================================
   Positioning Grid (4 columns)
   ======================================== */

.positioning-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-lg);
  margin-top: var(--spacing-xl);
}

.positioning-card {
  background-color: var(--color-bg-light);
  padding: var(--spacing-lg);
  border-radius: var(--border-radius-lg);
  border: 1px solid var(--color-border);
  transition: all var(--transition-normal);
}

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

.positioning-card h3 {
  font-size: var(--font-size-lg);
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: var(--spacing-md);
}

.positioning-card p {
  font-size: var(--font-size-sm);
  color: var(--color-text-light);
  line-height: 1.6;
}

/* ========================================
   Products Grid (2 columns)
   ======================================== */

.products-grid-2col {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
  gap: var(--spacing-lg);
  margin-top: var(--spacing-xl);
}

.product-card-large {
  background-color: var(--color-white);
  padding: var(--spacing-lg);
  border: 2px solid var(--color-border);
  border-radius: var(--border-radius-lg);
  transition: all var(--transition-normal);
}

.product-card-large:hover {
  box-shadow: var(--shadow-lg);
  border-color: var(--color-primary);
}

.product-card-large h3 {
  font-size: var(--font-size-lg);
  font-weight: 700;
  color: var(--color-text-dark);
  margin-bottom: var(--spacing-md);
}

.product-card-large p {
  font-size: var(--font-size-sm);
  color: var(--color-text-light);
  line-height: 1.6;
}

/* ========================================
   Needs Grid (2 columns)
   ======================================== */

.needs-grid-2col {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
  gap: var(--spacing-lg);
  margin-top: var(--spacing-xl);
}

.need-card {
  background-color: var(--color-bg-light);
  padding: var(--spacing-lg);
  border-radius: var(--border-radius-lg);
  border: 1px solid var(--color-border);
  transition: all var(--transition-normal);
}

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

.need-card h3 {
  font-size: var(--font-size-lg);
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: var(--spacing-md);
}

.need-card p {
  font-size: var(--font-size-sm);
  color: var(--color-text-light);
  line-height: 1.6;
}

/* ========================================
   Scenarios Grid (3 columns with images)
   ======================================== */

.scenarios-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-md);
  margin-top: var(--spacing-xl);
}

.scenario-card {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-lg);
  overflow: hidden;
  transition: all var(--transition-normal);
}

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

.scenario-image {
  width: 100%;
  height: 160px;
  overflow: hidden;
  background-color: var(--color-bg-light);
}

.scenario-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.scenario-card h3 {
  font-size: var(--font-size-base);
  font-weight: 700;
  color: var(--color-text-dark);
  padding: var(--spacing-md) var(--spacing-md) var(--spacing-sm);
  margin: 0;
}

.scenario-card p {
  font-size: 13px;
  color: var(--color-text-light);
  padding: 0 var(--spacing-md) var(--spacing-md);
  line-height: 1.5;
}

/* ========================================
   Principles Grid (2 columns)
   ======================================== */

.principles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
  gap: var(--spacing-lg);
  margin-top: var(--spacing-xl);
}

.principle-card {
  background-color: var(--color-white);
  padding: var(--spacing-lg);
  border: 2px solid var(--color-border);
  border-radius: var(--border-radius-lg);
  transition: all var(--transition-normal);
}

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

.principle-card h3 {
  font-size: var(--font-size-lg);
  font-weight: 700;
  color: var(--color-text-dark);
  margin-bottom: var(--spacing-md);
}

.principle-card p {
  font-size: var(--font-size-sm);
  color: var(--color-text-light);
  line-height: 1.6;
}

/* ========================================
   Integration Grid (2 columns)
   ======================================== */

.integration-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
  gap: var(--spacing-lg);
  margin-top: var(--spacing-xl);
}

.integration-card {
  background-color: var(--color-bg-light);
  padding: var(--spacing-lg);
  border-radius: var(--border-radius-lg);
  border: 1px solid var(--color-border);
  transition: all var(--transition-normal);
}

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

.integration-card h3 {
  font-size: var(--font-size-lg);
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: var(--spacing-md);
}

.integration-card p {
  font-size: var(--font-size-sm);
  color: var(--color-text-light);
  line-height: 1.6;
}

/* ========================================
   Value Points Grid (3 columns)
   ======================================== */

.value-points-container {
  margin-top: var(--spacing-xl);
}

.value-points-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-2xl);
}

.value-point-card {
  background-color: var(--color-white);
  padding: var(--spacing-lg);
  border: 2px solid var(--color-border);
  border-radius: var(--border-radius-lg);
  text-align: center;
  transition: all var(--transition-normal);
}

.value-point-card:hover {
  box-shadow: var(--shadow-lg);
  border-color: var(--color-primary);
}

.value-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 50px;
  height: 50px;
  background-color: var(--color-primary);
  color: var(--color-white);
  border-radius: 50%;
  font-weight: 700;
  font-size: var(--font-size-2xl);
  margin-bottom: var(--spacing-md);
}

.value-point-card h3 {
  font-size: var(--font-size-lg);
  font-weight: 700;
  color: var(--color-text-dark);
  margin-bottom: var(--spacing-md);
}

.value-point-card p {
  font-size: var(--font-size-sm);
  color: var(--color-text-light);
  line-height: 1.6;
}

.core-concepts {
  background-color: var(--color-bg-light);
  padding: var(--spacing-xl);
  border-radius: var(--border-radius-lg);
  border: 1px solid var(--color-border);
}

.core-concepts h3 {
  font-size: var(--font-size-lg);
  font-weight: 700;
  color: var(--color-text-dark);
  margin-bottom: var(--spacing-lg);
}

.core-concepts ul {
  list-style: none;
  padding: 0;
}

.core-concepts li {
  padding: var(--spacing-sm) 0;
  padding-left: var(--spacing-lg);
  position: relative;
  color: var(--color-text-light);
  font-size: var(--font-size-sm);
  line-height: 1.6;
}

.core-concepts li:before {
  content: "•";
  position: absolute;
  left: 0;
  color: var(--color-primary);
  font-weight: 700;
}

/* ========================================
   Objections Grid (2 columns)
   ======================================== */

.objections-grid-2col {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
  gap: var(--spacing-lg);
  margin-top: var(--spacing-xl);
}

.objection-card {
  background-color: var(--color-white);
  padding: var(--spacing-lg);
  border: 2px solid var(--color-border);
  border-radius: var(--border-radius-lg);
  transition: all var(--transition-normal);
}

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

.objection-card h3 {
  font-size: var(--font-size-lg);
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: var(--spacing-md);
}

.objection-card p {
  font-size: var(--font-size-sm);
  color: var(--color-text-light);
  line-height: 1.6;
}

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

.cta-section {
  background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
  border-radius: var(--border-radius-xl);
  text-align: center;
  padding: var(--spacing-2xl);
  margin-top: var(--spacing-2xl);
}

.cta-section h2 {
  font-size: var(--font-size-3xl);
  font-weight: 800;
  color: var(--color-text-dark);
  margin-bottom: var(--spacing-md);
}

.cta-section p {
  font-size: var(--font-size-lg);
  color: var(--color-text-light);
  max-width: 600px;
  margin: 0 auto var(--spacing-xl);
}

.cta-buttons {
  display: flex;
  gap: var(--spacing-lg);
  justify-content: center;
  flex-wrap: wrap;
}

/* ========================================
   Buttons
   ======================================== */

.btn-primary,
.btn-secondary {
  padding: var(--spacing-md) var(--spacing-xl);
  border-radius: var(--border-radius-lg);
  font-size: var(--font-size-base);
  font-weight: 600;
  text-decoration: none;
  transition: all var(--transition-normal);
  display: inline-block;
  text-align: center;
  cursor: pointer;
  border: none;
}

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

.btn-primary:hover {
  background-color: var(--color-primary-dark);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

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

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

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

.footer {
  background-color: var(--color-white);
  border-top: 1px solid var(--color-border);
  padding: var(--spacing-xl) 0;
  margin-top: var(--spacing-2xl);
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--spacing-2xl);
}

.footer-left {
  flex-shrink: 0;
}

.footer-logo {
  height: 40px;
  width: auto;
  max-width: 150px;
}

.footer-center {
  display: flex;
  gap: var(--spacing-lg);
  justify-content: center;
  flex: 1;
}

.social-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  color: var(--color-text-dark);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.social-icon svg {
  width: 20px;
  height: 20px;
}

.social-icon:hover {
  color: var(--color-primary);
}

.footer-right {
  flex-shrink: 0;
  text-align: right;
  font-size: var(--font-size-sm);
  color: var(--color-text-light);
}

.footer-right p {
  margin: 0;
}

.footer-right a {
  color: var(--color-text-light);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.footer-right a:hover {
  color: var(--color-primary);
}

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

@media (max-width: 768px) {
  :root {
    --font-size-base: 14px;
    --font-size-3xl: 24px;
    --font-size-4xl: 32px;
  }

  .header-top-bar {
    flex-direction: column;
    gap: var(--spacing-md);
  }

  .header-top-right {
    width: 100%;
    justify-content: space-between;
  }

  .nav-links {
    gap: var(--spacing-md);
  }

  .nav-link {
    font-size: var(--font-size-xs);
  }

  .hero {
    min-height: 300px;
    padding: var(--spacing-xl) var(--spacing-md);
  }

  .hero-title {
    font-size: var(--font-size-2xl);
  }

  .hero-subtitle {
    font-size: var(--font-size-lg);
  }

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

  .btn-primary,
  .btn-secondary {
    width: 100%;
  }

  .products-grid-2col,
  .needs-grid-2col,
  .principles-grid,
  .integration-grid,
  .objections-grid-2col {
    grid-template-columns: 1fr;
  }

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

  .value-points-grid {
    grid-template-columns: 1fr;
  }

  .footer-content {
    flex-direction: column;
    text-align: center;
    gap: var(--spacing-lg);
  }

  .footer-right {
    text-align: center;
  }

  .section-main-title {
    font-size: var(--font-size-2xl);
  }

  .cta-section {
    padding: var(--spacing-xl);
  }

  .cta-section h2 {
    font-size: var(--font-size-2xl);
  }
}

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

  .header-top-bar {
    flex-direction: column;
    gap: var(--spacing-md);
  }

  .nav-links {
    flex-direction: column;
    gap: var(--spacing-sm);
  }

  .hero {
    min-height: 250px;
  }

  .hero-title {
    font-size: var(--font-size-xl);
  }

  .hero-subtitle {
    font-size: var(--font-size-base);
  }

  .section-main-title {
    font-size: var(--font-size-xl);
  }

  .products-grid-2col,
  .needs-grid-2col,
  .principles-grid,
  .integration-grid,
  .objections-grid-2col,
  .scenarios-grid,
  .value-points-grid {
    grid-template-columns: 1fr;
  }

  .footer-content {
    flex-direction: column;
  }

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

  .btn-primary,
  .btn-secondary {
    width: 100%;
  }
}