/**
 * US Stock Landing Page Theme - Style CSS
 * Mobile-First, Google Ads Compliant Design
 * No External Dependencies
 */

/* ========================================
   CSS Variables
======================================== */
:root {
  /* Colors */
  --primary-color: #1a73e8;
  --primary-hover: #1557b0;
  --secondary-color: #34a853;
  --secondary-hover: #2d8e47;
  --danger-color: #ea4335;
  --warning-color: #fbbc04;
  --text-dark: #202124;
  --text-medium: #5f6368;
  --text-light: #80868b;
  --bg-white: #ffffff;
  --bg-light: #f8f9fa;
  --bg-dark: #001529;
  --border-color: #dadce0;
  
  /* Typography */
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-size-base: 16px;
  --line-height-base: 1.6;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-bold: 700;
  
  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-xxl: 4rem;
  
  /* Layout */
  --container-max-width: 1200px;
  --border-radius: 8px;
  --box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
  --box-shadow-lg: 0 4px 16px rgba(0, 0, 0, 0.15);
  
  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
}

/* ========================================
   Global Reset & Base Styles
======================================== */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: var(--font-size-base);
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  line-height: var(--line-height-base);
  color: var(--text-dark);
  background-color: var(--bg-white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

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

/* ========================================
   Container
======================================== */
.usl-container {
  width: 100%;
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

/* ========================================
   Navigation
======================================== */
.usl-nav {
  position: sticky;
  top: 0;
  background-color: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-color);
  z-index: 1000;
  padding: var(--spacing-sm) 0;
}

.usl-nav-wrapper {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.usl-logo a {
  font-size: 1.5rem;
  font-weight: var(--font-weight-bold);
  color: var(--text-dark);
}

.usl-nav-toggle {
  display: flex;
  flex-direction: column;
  gap: 4px;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--spacing-xs);
}

.usl-nav-toggle span {
  width: 24px;
  height: 2px;
  background-color: var(--text-dark);
  transition: var(--transition-normal);
}

.usl-nav-menu {
  display: none;
  list-style: none;
}

.usl-nav-menu li {
  margin: var(--spacing-sm) 0;
}

.usl-nav-menu a {
  color: var(--text-dark);
  font-weight: var(--font-weight-medium);
  padding: var(--spacing-xs) var(--spacing-sm);
  display: block;
}

.usl-nav-cta {
  background-color: var(--primary-color);
  color: var(--bg-white) !important;
  padding: var(--spacing-xs) var(--spacing-md) !important;
  border-radius: var(--border-radius);
  transition: background-color var(--transition-fast);
}

.usl-nav-cta:hover {
  background-color: var(--primary-hover);
}

/* ========================================
   Hero Section
======================================== */
.usl-hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--bg-white);
  text-align: center;
  overflow: hidden;
}

.usl-hero-bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, #001529 0%, #003366 50%, #1a73e8 100%);
  z-index: -2;
}

.usl-hero-bg::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: 
    radial-gradient(circle at 20% 50%, rgba(26, 115, 232, 0.2) 0%, transparent 50%),
    radial-gradient(circle at 80% 80%, rgba(52, 168, 83, 0.2) 0%, transparent 50%);
  z-index: -1;
}

.usl-hero-content {
  position: relative;
  z-index: 1;
  padding: var(--spacing-xxl) var(--spacing-md);
  max-width: 900px;
}

.usl-hero-title {
  font-size: 2.5rem;
  font-weight: var(--font-weight-bold);
  line-height: 1.2;
  margin-bottom: var(--spacing-md);
}

.usl-hero-subtitle {
  font-size: 1.25rem;
  font-weight: var(--font-weight-normal);
  line-height: 1.5;
  margin-bottom: var(--spacing-xl);
  opacity: 0.9;
}

.usl-hero-actions {
  margin-bottom: var(--spacing-md);
}

.usl-hero-risk {
  font-size: 0.9rem;
  opacity: 0.8;
  font-style: italic;
}

/* ========================================
   Buttons
======================================== */
.usl-btn {
  display: inline-block;
  padding: var(--spacing-sm) var(--spacing-lg);
  font-size: 1rem;
  font-weight: var(--font-weight-medium);
  text-align: center;
  border: none;
  border-radius: var(--border-radius);
  cursor: pointer;
  transition: all var(--transition-fast);
  min-width: 44px;
  min-height: 44px;
}

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

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

.usl-btn-secondary {
  background-color: var(--secondary-color);
  color: var(--bg-white);
}

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

/* ========================================
   Sections
======================================== */
.usl-values,
.usl-features,
.usl-newsletter {
  padding: var(--spacing-xxl) 0;
}

.usl-section-title {
  font-size: 2rem;
  font-weight: var(--font-weight-bold);
  text-align: center;
  margin-bottom: var(--spacing-xl);
  color: var(--text-dark);
}

/* ========================================
   Value Proposition Cards
======================================== */
.usl-values-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-lg);
  margin-top: var(--spacing-xl);
}

.usl-value-card {
  background-color: var(--bg-white);
  padding: var(--spacing-lg);
  border-radius: var(--border-radius);
  box-shadow: var(--box-shadow);
  text-align: center;
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

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

.usl-value-icon {
  width: 80px;
  height: 80px;
  margin: 0 auto var(--spacing-md);
  display: flex;
  align-items: center;
  justify-content: center;
}

.usl-value-icon img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.usl-value-title {
  font-size: 1.25rem;
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--spacing-sm);
  color: var(--text-dark);
}

.usl-value-desc {
  font-size: 1rem;
  color: var(--text-medium);
  line-height: 1.6;
}

/* ========================================
   Features Section
======================================== */
.usl-features {
  background-color: var(--bg-light);
}

.usl-features-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-lg);
}

.usl-feature-card {
  background-color: var(--bg-white);
  padding: var(--spacing-lg);
  border-radius: var(--border-radius);
  box-shadow: var(--box-shadow);
}

.usl-feature-card h3 {
  font-size: 1.25rem;
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--spacing-sm);
  color: var(--text-dark);
}

.usl-feature-card p {
  color: var(--text-medium);
  line-height: 1.6;
}

/* ========================================
   Risk Warning Section
======================================== */
.usl-risk-section {
  background-color: #fff3cd;
  border-top: 3px solid var(--warning-color);
  border-bottom: 3px solid var(--warning-color);
  padding: var(--spacing-xl) 0;
}

.usl-risk-content {
  max-width: 800px;
  margin: 0 auto;
  text-align: center;
}

.usl-risk-content h2 {
  color: var(--text-dark);
  font-size: 1.5rem;
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--spacing-md);
}

.usl-risk-content p {
  color: var(--text-medium);
  margin-bottom: var(--spacing-md);
  line-height: 1.6;
}

/* ========================================
   Newsletter Section
======================================== */
.usl-newsletter {
  background-color: var(--bg-dark);
  color: var(--bg-white);
}

.usl-newsletter .usl-section-title {
  color: var(--bg-white);
}

.usl-newsletter-subtitle {
  text-align: center;
  margin-bottom: var(--spacing-lg);
  opacity: 0.9;
}

.usl-newsletter-form {
  max-width: 500px;
  margin: 0 auto var(--spacing-md);
  display: flex;
  gap: var(--spacing-sm);
  flex-direction: column;
}

.usl-newsletter-form input[type="email"] {
  flex: 1;
  padding: var(--spacing-sm) var(--spacing-md);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  font-size: 1rem;
  min-height: 44px;
}

.usl-newsletter-privacy {
  text-align: center;
  font-size: 0.875rem;
  opacity: 0.8;
}

/* ========================================
   Footer
======================================== */
.usl-footer {
  background-color: var(--bg-dark);
  color: var(--bg-white);
  padding: var(--spacing-xxl) 0 var(--spacing-lg);
}

.usl-footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-xl);
}

.usl-footer-title {
  color: var(--bg-white);
  font-size: 1.125rem;
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--spacing-md);
}

.usl-footer-links {
  list-style: none;
}

.usl-footer-links li {
  margin-bottom: var(--spacing-sm);
}

.usl-footer-links a {
  color: rgba(255, 255, 255, 0.8);
  transition: color var(--transition-fast);
}

.usl-footer-links a:hover {
  color: var(--bg-white);
}

.usl-footer-disclaimer {
  font-size: 0.875rem;
  line-height: 1.6;
  color: rgba(255, 255, 255, 0.8);
}

.usl-footer-bottom {
  text-align: center;
  padding-top: var(--spacing-lg);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.6);
}

.usl-footer-powered {
  margin-top: var(--spacing-xs);
}

/* Footer Address - Google Ads Required */
.usl-footer-address {
  font-style: normal;
  font-size: 0.875rem;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.8);
}

.usl-footer-address strong {
  color: var(--bg-white);
  display: block;
  margin-bottom: var(--spacing-xs);
}

.usl-footer-address a {
  color: rgba(255, 255, 255, 0.8);
  text-decoration: none;
}

.usl-footer-address a:hover {
  color: var(--bg-white);
}

/* Regulatory Disclaimer - Google Ads Required */
.usl-regulatory-disclaimer {
  background-color: rgba(255, 255, 255, 0.05);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  padding: var(--spacing-md) 0;
  margin: var(--spacing-lg) 0;
  text-align: center;
}

.usl-regulatory-disclaimer p {
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.7);
  line-height: 1.6;
  margin: 0;
}

/* Newsletter Consent Text */
.usl-newsletter-consent {
  text-align: center;
  font-size: 0.875rem;
  margin-top: var(--spacing-md);
  opacity: 0.9;
}

/* Features Disclaimer */
.usl-features-disclaimer {
  text-align: center;
  font-size: 0.875rem;
  color: var(--text-medium);
  margin-top: var(--spacing-lg);
  padding: var(--spacing-md);
  background-color: rgba(251, 188, 4, 0.1);
  border-left: 3px solid var(--warning-color);
  border-radius: var(--border-radius);
  line-height: 1.6;
}

/* ========================================
   WhatsApp Floating Button
======================================== */
.usl-whatsapp-float {
  position: fixed;
  bottom: 20px;
  right: 20px;
  width: 60px;
  height: 60px;
  background-color: #25d366;
  color: var(--bg-white);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--box-shadow-lg);
  z-index: 999;
  transition: all var(--transition-fast);
}

.usl-whatsapp-float:hover {
  transform: scale(1.1);
  box-shadow: 0 6px 20px rgba(37, 211, 102, 0.4);
}

.usl-whatsapp-float svg {
  fill: currentColor;
}

/* ========================================
   Legal Pages
======================================== */
.usl-legal .usl-main {
  padding: var(--spacing-xxl) 0;
  min-height: calc(100vh - 200px);
}

.usl-legal-container {
  max-width: 800px;
}

.usl-legal-title {
  font-size: 2.5rem;
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--spacing-sm);
  color: var(--text-dark);
}

.usl-legal-update {
  color: var(--text-medium);
  font-size: 0.875rem;
  margin-bottom: var(--spacing-xl);
}

.usl-legal-content section {
  margin-bottom: var(--spacing-xl);
}

.usl-legal-content h2 {
  font-size: 1.5rem;
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--spacing-md);
  color: var(--text-dark);
}

.usl-legal-content h3 {
  font-size: 1.25rem;
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--spacing-sm);
  color: var(--text-dark);
}

.usl-legal-content p {
  margin-bottom: var(--spacing-md);
  line-height: 1.8;
  color: var(--text-medium);
}

.usl-legal-content a {
  color: var(--primary-color);
  text-decoration: underline;
}

.usl-legal-footer {
  margin-top: var(--spacing-xxl);
  text-align: center;
}

/* Risk Warning Specific Styles */
.usl-risk-alert {
  background-color: #fff3cd;
  border-left: 4px solid var(--warning-color);
  padding: var(--spacing-md);
  margin: var(--spacing-lg) 0;
  border-radius: var(--border-radius);
}

.usl-risk-alert strong {
  color: var(--danger-color);
  font-weight: var(--font-weight-bold);
}

/* Contact Page */
.usl-contact-method {
  margin-bottom: var(--spacing-xl);
  padding: var(--spacing-lg);
  background-color: var(--bg-light);
  border-radius: var(--border-radius);
}

.usl-contact-link {
  font-size: 1.25rem;
  color: var(--primary-color);
  text-decoration: none;
}

/* ========================================
   Article/Post Styles
======================================== */
.usl-article {
  max-width: 800px;
  margin: 0 auto;
}

.usl-article-header {
  margin-bottom: var(--spacing-xl);
}

.usl-article-header h1 {
  font-size: 2.5rem;
  font-weight: var(--font-weight-bold);
  line-height: 1.2;
  margin-bottom: var(--spacing-md);
  color: var(--text-dark);
}

.usl-article-meta {
  color: var(--text-medium);
  font-size: 0.875rem;
}

.usl-meta-sep {
  margin: 0 var(--spacing-xs);
}

.usl-article-content {
  font-size: 1.125rem;
  line-height: 1.8;
  color: var(--text-dark);
}

.usl-article-content p {
  margin-bottom: var(--spacing-md);
}

.usl-article-content h2 {
  font-size: 1.75rem;
  font-weight: var(--font-weight-bold);
  margin-top: var(--spacing-xl);
  margin-bottom: var(--spacing-md);
}

.usl-article-content h3 {
  font-size: 1.5rem;
  font-weight: var(--font-weight-bold);
  margin-top: var(--spacing-lg);
  margin-bottom: var(--spacing-md);
}

.usl-article-tags {
  margin-top: var(--spacing-xl);
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--border-color);
}

.usl-tag {
  display: inline-block;
  background-color: var(--bg-light);
  color: var(--text-medium);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--border-radius);
  font-size: 0.875rem;
  margin-right: var(--spacing-xs);
  margin-top: var(--spacing-xs);
}

/* ========================================
   Responsive Design - Tablet & Desktop
======================================== */
@media (min-width: 768px) {
  .usl-container {
    padding: 0 var(--spacing-lg);
  }
  
  .usl-nav-toggle {
    display: none;
  }
  
  .usl-nav-menu {
    display: flex;
    gap: var(--spacing-sm);
  }
  
  .usl-nav-menu li {
    margin: 0;
  }
  
  .usl-hero-title {
    font-size: 3.5rem;
  }
  
  .usl-hero-subtitle {
    font-size: 1.5rem;
  }
  
  .usl-values-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .usl-features-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  
  .usl-footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .usl-newsletter-form {
    flex-direction: row;
  }
}

@media (min-width: 1024px) {
  .usl-hero-title {
    font-size: 4rem;
  }
  
  .usl-values-grid {
    grid-template-columns: repeat(4, 1fr);
  }
  
  .usl-footer-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

/* ========================================
   Utility Classes
======================================== */
.usl-text-center {
  text-align: center;
}

.usl-mt-sm {
  margin-top: var(--spacing-sm);
}

.usl-mt-md {
  margin-top: var(--spacing-md);
}

.usl-mt-lg {
  margin-top: var(--spacing-lg);
}

.usl-mb-sm {
  margin-bottom: var(--spacing-sm);
}

.usl-mb-md {
  margin-bottom: var(--spacing-md);
}

.usl-mb-lg {
  margin-bottom: var(--spacing-lg);
}