:root {
  /* Color palette - 60-30-10 rule for tech theme */
  --color-primary: #1a1a1a;
  --color-secondary: #2d2d2d;
  --color-accent: #007bff;
  --color-background: #ffffff;
  --color-text: #333333;
  --color-text-light: #666666;
  --color-border: #e0e0e0;
  --color-success: #28a745;
  --color-warning: #ffc107;
  --color-error: #dc3545;
  
  /* Typography */
  --font-heading: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  
  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-xxl: 4rem;
  
  /* Breakpoints */
  --breakpoint-mobile: 768px;
  --breakpoint-tablet: 1024px;
  --breakpoint-desktop: 1200px;
}

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

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

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

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--spacing-sm);
}

h1 {
  font-size: 2rem;
}

h2 {
  font-size: 1.75rem;
}

h3 {
  font-size: 1.5rem;
}

h4 {
  font-size: 1.25rem;
}

h5 {
  font-size: 1.125rem;
}

h6 {
  font-size: 1rem;
}

p {
  margin-bottom: var(--spacing-sm);
}

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

a:hover {
  text-decoration: underline;
}

/* Layout helpers */
.container {
  max-width: var(--breakpoint-desktop);
  margin: 0 auto;
  padding: 0 var(--spacing-sm);
}

.row {
  display: flex;
  flex-wrap: wrap;
  margin: 0 -var(--spacing-sm);
}

.col {
  flex: 1;
  padding: 0 var(--spacing-sm);
}

/* Age verification popup */
.age-verification {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.95);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10000;
}

.age-verification__content {
  background-color: var(--color-background);
  padding: var(--spacing-xl);
  border-radius: 8px;
  max-width: 400px;
  width: 90%;
  text-align: center;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.age-verification__title {
  font-size: 1.5rem;
  margin-bottom: var(--spacing-md);
  color: var(--color-text);
}

.age-verification__message {
  margin-bottom: var(--spacing-lg);
  color: var(--color-text-light);
}

.age-verification__button {
  background-color: var(--color-accent);
  color: white;
  padding: var(--spacing-sm) var(--spacing-lg);
  border: none;
  border-radius: 4px;
  font-size: 1rem;
  cursor: pointer;
  width: 100%;
}

.age-verification__button:hover {
  background-color: #0056b3;
}

.age-verification__footer {
  margin-top: var(--spacing-md);
  font-size: 0.875rem;
  color: var(--color-text-light);
}

/* Header */
.header {
  background-color: var(--color-background);
  border-bottom: 1px solid var(--color-border);
  padding: var(--spacing-sm) 0;
}

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

.header__logo {
  display: flex;
  align-items: center;
}

.header__logo-img {
  height: 40px;
  width: auto;
}

.header__nav {
  display: none;
}

.header__nav-list {
  display: flex;
  list-style: none;
  gap: var(--spacing-lg);
}

.header__nav-link {
  color: var(--color-text);
  font-weight: 500;
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: 4px;
}

.header__nav-link:hover {
  background-color: var(--color-border);
  text-decoration: none;
}

/* Hamburger menu */
.hamburger {
  display: block;
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--color-text);
}

.hamburger--active .hamburger__icon::before {
  content: '\f00d';
}

.hamburger__icon::before {
  content: '\f0c9';
  font-family: 'Font Awesome 6 Free';
  font-weight: 900;
}

.mobile-menu {
  position: fixed;
  top: 0;
  right: -100%;
  width: 80%;
  max-width: 300px;
  height: 100vh;
  background-color: var(--color-background);
  box-shadow: -4px 0 20px rgba(0, 0, 0, 0.1);
  z-index: 1000;
  padding: var(--spacing-lg);
  transition: right 0.3s ease;
}

.mobile-menu--active {
  right: 0;
}

.mobile-menu__close {
  position: absolute;
  top: var(--spacing-sm);
  right: var(--spacing-sm);
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--color-text);
}

.mobile-menu__close::before {
  content: '\f00d';
  font-family: 'Font Awesome 6 Free';
  font-weight: 900;
}

.mobile-menu__list {
  list-style: none;
  margin-top: var(--spacing-xl);
}

.mobile-menu__item {
  margin-bottom: var(--spacing-md);
}

.mobile-menu__link {
  color: var(--color-text);
  font-weight: 500;
  font-size: 1.125rem;
  display: block;
  padding: var(--spacing-sm);
  border-radius: 4px;
}

.mobile-menu__link:hover {
  background-color: var(--color-border);
  text-decoration: none;
}

.mobile-menu__overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.5);
  z-index: 999;
  display: none;
}

.mobile-menu__overlay--active {
  display: block;
}

/* Hero section */
.hero {
  position: relative;
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  padding: var(--spacing-xxl) 0;
  color: white;
  text-align: center;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.6);
  z-index: 1;
}

.hero__container {
  position: relative;
  z-index: 2;
}

.hero__title {
  font-size: 2.5rem;
  margin-bottom: var(--spacing-md);
  font-weight: 700;
}

.hero__subtitle {
  font-size: 1.25rem;
  margin-bottom: var(--spacing-lg);
  opacity: 0.9;
}

.hero__button {
  display: inline-block;
  background-color: var(--color-accent);
  color: white;
  padding: var(--spacing-sm) var(--spacing-lg);
  border-radius: 4px;
  font-weight: 600;
  text-decoration: none;
  margin: var(--spacing-xs);
}

.hero__button:hover {
  background-color: #0056b3;
  text-decoration: none;
}

.hero__button--secondary {
  background-color: transparent;
  border: 2px solid white;
}

.hero__button--secondary:hover {
  background-color: white;
  color: var(--color-text);
}

/* Sections */
.section {
  padding: var(--spacing-xxl) 0;
}

.section--alt {
  background-color: #f8f9fa;
}

.section__title {
  text-align: center;
  margin-bottom: var(--spacing-xl);
  font-size: 2rem;
}

.section__subtitle {
  text-align: center;
  margin-bottom: var(--spacing-lg);
  font-size: 1.125rem;
  color: var(--color-text-light);
}

/* Platform cards */
.platforms {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-lg);
  margin-top: var(--spacing-xl);
}

.platform-card {
  background-color: var(--color-background);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: var(--spacing-lg);
  text-align: center;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.platform-card__logo {
  height: 60px;
  width: auto;
  margin-bottom: var(--spacing-md);
}

.platform-card__excerpt {
  margin-bottom: var(--spacing-md);
  color: var(--color-text-light);
}

.platform-card__features {
  list-style: none;
  margin-bottom: var(--spacing-lg);
}

.platform-card__feature {
  margin-bottom: var(--spacing-xs);
  color: var(--color-success);
}

.platform-card__feature::before {
  content: '\f00c';
  font-family: 'Font Awesome 6 Free';
  font-weight: 900;
  margin-right: var(--spacing-xs);
}

.platform-card__buttons {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.platform-card__button {
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: 4px;
  font-weight: 600;
  text-decoration: none;
  text-align: center;
  display: block;
}

.platform-card__button--primary {
  background-color: var(--color-accent);
  color: white;
}

.platform-card__button--primary:hover {
  background-color: #0056b3;
  text-decoration: none;
}

.platform-card__button--secondary {
  background-color: transparent;
  color: var(--color-accent);
  border: 2px solid var(--color-accent);
}

.platform-card__button--secondary:hover {
  background-color: var(--color-accent);
  color: white;
  text-decoration: none;
}

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

.feature {
  text-align: center;
  padding: var(--spacing-md);
}

.feature__icon {
  font-size: 3rem;
  color: var(--color-accent);
  margin-bottom: var(--spacing-md);
}

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

.feature__description {
  color: var(--color-text-light);
}

/* Accordion */
.accordion {
  border: 1px solid var(--color-border);
  border-radius: 8px;
  overflow: hidden;
}

.accordion__item {
  border-bottom: 1px solid var(--color-border);
}

.accordion__item:last-child {
  border-bottom: none;
}

.accordion__header {
  background-color: var(--color-background);
  padding: var(--spacing-md);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-weight: 600;
}

.accordion__header:hover {
  background-color: #f8f9fa;
}

.accordion__icon {
  font-size: 1rem;
  color: var(--color-accent);
}

.accordion__content {
  padding: var(--spacing-md);
  background-color: #f8f9fa;
  display: none;
}

.accordion__content--active {
  display: block;
}

/* Pros and cons */
.pros-cons {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-lg);
}

.pros, .cons {
  padding: var(--spacing-md);
  border-radius: 8px;
}

.pros {
  background-color: rgba(40, 167, 69, 0.1);
  border-left: 4px solid var(--color-success);
}

.cons {
  background-color: rgba(220, 53, 69, 0.1);
  border-left: 4px solid var(--color-error);
}

.pros__title, .cons__title {
  margin-bottom: var(--spacing-md);
  font-weight: 600;
}

.pros__title {
  color: var(--color-success);
}

.cons__title {
  color: var(--color-error);
}

.pros__list, .cons__list {
  list-style: none;
}

.pros__item, .cons__item {
  margin-bottom: var(--spacing-sm);
  padding-left: var(--spacing-md);
  position: relative;
}

.pros__item::before {
  content: '\f00c';
  font-family: 'Font Awesome 6 Free';
  font-weight: 900;
  position: absolute;
  left: 0;
  color: var(--color-success);
}

.cons__item::before {
  content: '\f00d';
  font-family: 'Font Awesome 6 Free';
  font-weight: 900;
  position: absolute;
  left: 0;
  color: var(--color-error);
}

/* Footer */
.footer {
  background-color: var(--color-primary);
  color: white;
  padding: var(--spacing-xl) 0 var(--spacing-lg);
}

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

.footer__brand {
  text-align: center;
}

.footer__logo {
  height: 50px;
  width: auto;
  margin-bottom: var(--spacing-sm);
}

.footer__site-name {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: var(--spacing-md);
}

.footer__compliance {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
}

.footer__badge {
  height: 40px;
  width: auto;
  opacity: 0.8;
}

.footer__badge:hover {
  opacity: 1;
}

.footer__nav {
  text-align: center;
}

.footer__nav-title {
  font-weight: 600;
  margin-bottom: var(--spacing-md);
}

.footer__nav-list {
  list-style: none;
  margin-bottom: var(--spacing-lg);
}

.footer__nav-item {
  margin-bottom: var(--spacing-xs);
}

.footer__nav-link {
  color: rgba(255, 255, 255, 0.8);
  text-decoration: none;
}

.footer__nav-link:hover {
  color: white;
  text-decoration: underline;
}

.footer__notices {
  text-align: center;
  padding-top: var(--spacing-lg);
  border-top: 1px solid rgba(255, 255, 255, 0.2);
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.8);
}

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

.footer__update-date {
  font-size: 0.75rem;
  opacity: 0.6;
}

/* Responsive design */
@media (min-width: 768px) {
  .header__nav {
    display: block;
  }
  
  .hamburger {
    display: none;
  }
  
  .hero__title {
    font-size: 3rem;
  }
  
  .platforms {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .features {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .pros-cons {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .platform-card__buttons {
    flex-direction: row;
  }
  
  .footer__container {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .hero__title {
    font-size: 3.5rem;
  }
  
  .platforms {
    grid-template-columns: repeat(3, 1fr);
  }
  
  .features {
    grid-template-columns: repeat(3, 1fr);
  }
  
  .footer__container {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* Utility classes */
.text-center {
  text-align: center;
}

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

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

.hidden {
  display: none;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Age verification hidden state */
.age-verification-hidden {
  display: none;
}