/* CarbonCoin Design System - HTML/CSS Version */

/* CSS Variables (Brand Colors) */
:root {
  /* CarbonCoin Brand Colors */
  --primary-green: #1DB954;
  --secondary-blue: #0077B6;
  --neutral-light: #F5F5F5;
  --neutral-dark: #1A1A1A;
  --accent-yellow: #FFB703;
  
  /* Base spacing - 8px grid */
  --spacing-base: 8px;
  --spacing-section-desktop: 64px;
  --spacing-section-mobile: 32px;
  
  /* Theme colors */
  --background: #ffffff;
  --foreground: var(--neutral-dark);
  --card: #ffffff;
  --muted: var(--neutral-light);
  --muted-foreground: #6B7280;
  --border: rgba(0, 0, 0, 0.1);
  --border-hover: rgba(0, 0, 0, 0.2);
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.1);
  --radius: 0.5rem;
  
  /* Typography */
  --text-xs: 12px;
  --text-sm: 14px;
  --text-base: 16px;
  --text-lg: 18px;
  --text-xl: 24px;
  --text-2xl: 32px;
  --text-3xl: 40px;
  --text-4xl: 48px;
  
  /* Font weights */
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  
  /* Transitions */
  --transition-fast: 0.15s ease-in-out;
  --transition-normal: 0.3s ease-in-out;
  --transition-slow: 0.5s ease-in-out;
}

/* Dark mode */
@media (prefers-color-scheme: dark) {
  :root {
    --background: var(--neutral-dark);
    --foreground: var(--neutral-light);
    --card: #2A2A2A;
    --muted: #374151;
    --muted-foreground: #9CA3AF;
    --border: rgba(255, 255, 255, 0.1);
    --border-hover: rgba(255, 255, 255, 0.2);
  }
}

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

html {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  background-color: var(--background);
  color: var(--foreground);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Typography */
h1 {
  font-size: var(--text-2xl);
  font-weight: var(--font-weight-bold);
  line-height: 1.2;
}

h2 {
  font-size: var(--text-xl);
  font-weight: var(--font-weight-bold);
  line-height: 1.3;
}

h3 {
  font-size: var(--text-lg);
  font-weight: var(--font-weight-semibold);
  line-height: 1.4;
}

h4 {
  font-size: var(--text-base);
  font-weight: var(--font-weight-semibold);
  line-height: 1.5;
}

p {
  font-size: var(--text-base);
  font-weight: var(--font-weight-normal);
  line-height: 1.6;
}

/* Container */
.container {
  width: 100%;
  margin-left: auto;
  margin-right: auto;
  padding-left: 1rem;
  padding-right: 1rem;
}

@media (min-width: 375px) {
  .container {
    max-width: 375px;
  }
}

@media (min-width: 768px) {
  .container {
    max-width: 768px;
    padding-left: 2rem;
    padding-right: 2rem;
  }
}

@media (min-width: 1440px) {
  .container {
    max-width: 1440px;
    padding-left: 2rem;
    padding-right: 2rem;
  }
}

/* Section Padding */
.section-padding {
  padding-top: var(--spacing-section-mobile);
  padding-bottom: var(--spacing-section-mobile);
}

@media (min-width: 768px) {
  .section-padding {
    padding-top: var(--spacing-section-desktop);
    padding-bottom: var(--spacing-section-desktop);
  }
}

/* Button System */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  white-space: nowrap;
  border-radius: var(--radius);
  font-size: var(--text-base);
  font-weight: var(--font-weight-semibold);
  line-height: 1.5;
  transition: all var(--transition-fast);
  cursor: pointer;
  border: 1px solid transparent;
  text-decoration: none;
  outline: none;
  padding: 0.5rem 1rem;
  height: 2.25rem; /* 36px */
}

.btn:focus-visible {
  outline: 2px solid var(--primary-green);
  outline-offset: 2px;
}

.btn:disabled {
  pointer-events: none;
  opacity: 0.5;
}

/* Button Variants */
.btn-primary {
  background-color: var(--primary-green);
  color: white;
}

.btn-primary:hover {
  background-color: #169c43;
}

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

.btn-secondary:hover {
  background-color: #006399;
}

.btn-outline {
  border-color: var(--border);
  background-color: var(--background);
  color: var(--foreground);
}

.btn-outline:hover {
  background-color: var(--muted);
  color: var(--foreground);
}

.btn-ghost {
  background-color: transparent;
  color: var(--foreground);
}

.btn-ghost:hover {
  background-color: var(--muted);
  color: var(--foreground);
}

/* Button Sizes */
.btn-sm {
  height: 2rem; /* 32px */
  padding: 0.375rem 0.75rem;
  font-size: var(--text-sm);
}

.btn-lg {
  height: 2.5rem; /* 40px */
  padding: 0.625rem 1.5rem;
  font-size: var(--text-base);
}

/* Card Component */
.card {
  background-color: var(--card);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  overflow: hidden;
  transition: all var(--transition-normal);
}

.card:hover {
  box-shadow: var(--shadow-lg);
}

.card-header {
  padding: 1.5rem;
  border-bottom: 1px solid var(--border);
}

.card-title {
  font-size: var(--text-lg);
  font-weight: var(--font-weight-semibold);
  margin-bottom: 0.5rem;
}

.card-content {
  padding: 1.5rem;
}

/* Badge Component */
.badge {
  display: inline-flex;
  align-items: center;
  border-radius: calc(var(--radius) - 2px);
  padding: 0.25rem 0.625rem;
  font-size: var(--text-xs);
  font-weight: var(--font-weight-semibold);
  transition: all var(--transition-fast);
  border: 1px solid transparent;
}

.badge-default {
  background-color: var(--primary-green);
  color: white;
}

.badge-secondary {
  background-color: var(--muted);
  color: var(--muted-foreground);
}

.badge-outline {
  color: var(--foreground);
  border-color: var(--border);
}

/* Navigation */
.navbar {
  position: sticky;
  top: 0;
  z-index: 50;
  width: 100%;
  border-bottom: 1px solid var(--border);
  background-color: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
}

.navbar-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 4rem;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  background: none;
  border: none;
  cursor: pointer;
  color: inherit;
  transition: opacity var(--transition-fast);
}

.logo:hover {
  opacity: 0.8;
}

.logo-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  background-color: var(--primary-green);
  border-radius: var(--radius);
  color: white;
}

.logo-text h1 {
  font-size: var(--text-xl);
  font-weight: var(--font-weight-bold);
  color: var(--foreground);
  margin: 0;
}

.logo-text p {
  font-size: var(--text-xs);
  color: var(--muted-foreground);
  margin: 0;
}

@media (max-width: 640px) {
  .logo-text {
    display: none;
  }
}

.nav-desktop {
  display: none;
  align-items: center;
  gap: 1.5rem;
}

@media (min-width: 768px) {
  .nav-desktop {
    display: flex;
  }
}

.nav-link {
  background: none;
  border: none;
  font-size: var(--text-sm);
  font-weight: var(--font-weight-medium);
  color: var(--muted-foreground);
  cursor: pointer;
  transition: color var(--transition-fast);
  padding: 0.5rem 0;
  position: relative;
}

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

.nav-link.active {
  color: var(--primary-green);
  border-bottom: 2px solid var(--primary-green);
  padding-bottom: calc(0.5rem - 2px);
}

.user-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.coin-balance {
  display: none;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 0.75rem;
  background-color: rgba(29, 185, 84, 0.1);
  border-radius: var(--radius);
  color: var(--primary-green);
  font-weight: var(--font-weight-semibold);
}

@media (min-width: 640px) {
  .coin-balance {
    display: flex;
  }
}

.coin-text {
  font-size: var(--text-xs);
}

.auth-buttons-desktop {
  display: none;
  align-items: center;
  gap: 0.5rem;
}

@media (min-width: 640px) {
  .auth-buttons-desktop {
    display: flex;
  }
}

.mobile-menu-btn {
  display: flex;
  background: none;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.5rem;
  cursor: pointer;
  color: var(--foreground);
  transition: all var(--transition-fast);
}

.mobile-menu-btn:hover {
  background-color: var(--muted);
}

@media (min-width: 768px) {
  .mobile-menu-btn {
    display: none;
  }
}

/* Mobile Menu */
.mobile-menu {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  width: 320px;
  background-color: var(--background);
  border-left: 1px solid var(--border);
  box-shadow: var(--shadow-lg);
  z-index: 100;
  transform: translateX(100%);
  transition: transform var(--transition-normal);
}

.mobile-menu.open {
  transform: translateX(0);
}

.mobile-menu-content {
  display: flex;
  flex-direction: column;
  height: 100%;
  padding: 1.5rem;
  gap: 1.5rem;
}

.mobile-menu-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.mobile-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-weight: var(--font-weight-semibold);
}

.mobile-menu-close {
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  color: var(--foreground);
}

.mobile-coin-balance {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem;
  background-color: rgba(29, 185, 84, 0.1);
  border-radius: var(--radius);
  color: var(--primary-green);
}

.coin-info {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: var(--font-weight-medium);
}

.coin-number {
  font-weight: var(--font-weight-bold);
  color: var(--primary-green);
  margin: 0;
}

.coin-label {
  font-size: var(--text-xs);
  color: var(--primary-green);
  margin: 0;
}

.mobile-nav {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.mobile-nav-link {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  width: 100%;
  text-align: left;
  padding: 0.75rem;
  border-radius: var(--radius);
  background: none;
  border: none;
  color: var(--foreground);
  font-weight: var(--font-weight-medium);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.mobile-nav-link:hover,
.mobile-nav-link.active {
  background-color: rgba(29, 185, 84, 0.1);
  color: var(--primary-green);
}

.mobile-auth {
  margin-top: auto;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.mobile-auth-btn {
  width: 100%;
}

/* Toast System */
.toast-container {
  position: fixed;
  top: 1rem;
  right: 1rem;
  z-index: 1000;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  pointer-events: none;
}

.toast {
  background-color: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  padding: 1rem;
  min-width: 300px;
  pointer-events: auto;
  transform: translateX(100%);
  transition: transform var(--transition-normal);
}

.toast.show {
  transform: translateX(0);
}

.toast-success {
  border-left: 4px solid var(--primary-green);
}

.toast-error {
  border-left: 4px solid #DC2626;
}

.toast-info {
  border-left: 4px solid var(--secondary-blue);
}

/* Footer */
.footer {
  background-color: var(--neutral-dark);
  color: var(--neutral-light);
  padding-top: var(--spacing-section-desktop);
  padding-bottom: var(--spacing-section-desktop);
}

.footer-content {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

@media (min-width: 768px) {
  .footer-content {
    grid-template-columns: repeat(4, 1fr);
  }
}

.footer-section h4 {
  font-weight: var(--font-weight-semibold);
  margin-bottom: 1rem;
  color: white;
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.footer-logo h3 {
  font-size: var(--text-xl);
  font-weight: var(--font-weight-bold);
  color: white;
  margin: 0;
}

.footer-logo p {
  font-size: var(--text-sm);
  color: rgba(255, 255, 255, 0.7);
  margin: 0;
}

.footer-description {
  color: rgba(255, 255, 255, 0.8);
  font-size: var(--text-sm);
  line-height: 1.6;
}

.social-links {
  display: flex;
  gap: 1rem;
}

.social-links a {
  color: rgba(255, 255, 255, 0.7);
  transition: color var(--transition-fast);
}

.social-links a:hover {
  color: white;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.footer-links button {
  background: none;
  border: none;
  color: rgba(255, 255, 255, 0.8);
  font-size: var(--text-sm);
  text-align: left;
  cursor: pointer;
  padding: 0;
  transition: color var(--transition-fast);
}

.footer-links button:hover {
  color: white;
}

.newsletter-text {
  color: rgba(255, 255, 255, 0.8);
  font-size: var(--text-sm);
  margin-bottom: 1rem;
}

.newsletter-form {
  display: flex;
  margin-bottom: 0.75rem;
}

.newsletter-form input {
  flex: 1;
  padding: 0.5rem 0.75rem;
  font-size: var(--text-sm);
  background-color: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--radius) 0 0 var(--radius);
  color: white;
}

.newsletter-form input::placeholder {
  color: rgba(255, 255, 255, 0.6);
}

.newsletter-form button {
  border-radius: 0 var(--radius) var(--radius) 0;
}

.contact-info {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: var(--text-xs);
  color: rgba(255, 255, 255, 0.6);
}

.footer-bottom {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

@media (min-width: 640px) {
  .footer-bottom {
    flex-direction: row;
    justify-content: space-between;
  }
}

.copyright {
  color: rgba(255, 255, 255, 0.6);
  font-size: var(--text-sm);
  margin: 0;
}

.global-impact {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.impact-label {
  color: rgba(255, 255, 255, 0.8);
  font-size: var(--text-sm);
}

.impact-stats {
  display: flex;
  align-items: center;
  gap: 1rem;
  font-size: var(--text-sm);
}

.stat-green {
  color: var(--primary-green);
  font-weight: var(--font-weight-medium);
}

.stat-blue {
  color: var(--secondary-blue);
  font-weight: var(--font-weight-medium);
}

.stat-yellow {
  color: var(--accent-yellow);
  font-weight: var(--font-weight-medium);
}

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

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

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

.hidden {
  display: none !important;
}

.grid {
  display: grid;
}

.grid-cols-1 {
  grid-template-columns: repeat(1, minmax(0, 1fr));
}

.grid-cols-2 {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.grid-cols-3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.grid-cols-4 {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.gap-4 {
  gap: 1rem;
}

.gap-6 {
  gap: 1.5rem;
}

.gap-8 {
  gap: 2rem;
}

.gap-12 {
  gap: 3rem;
}

@media (min-width: 640px) {
  .sm\:grid-cols-2 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 768px) {
  .md\:grid-cols-2 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  
  .md\:grid-cols-3 {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  
  .md\:grid-cols-4 {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 1024px) {
  .lg\:grid-cols-2 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  
  .lg\:grid-cols-4 {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* Page-specific styles will be added in components.js */