/* 
 * Main CSS file following SMACSS architecture
 * (Scalable and Modular Architecture for CSS)
 */

/* Import tokens */
@import url('tokens.css');

/* ========== BASE ========== */
/* Base styles for HTML elements */

*, *::before, *::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  overflow-y: scroll;
  -webkit-text-size-adjust: 100%;
}

body {
  min-height: 100vh;
  line-height: var(--line-height-normal);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4, h5, h6 {
  margin-top: 0;
  line-height: var(--line-height-tight);
  font-weight: var(--font-weight-bold);
  color: var(--color-text);
}

h1 {
  font-size: var(--font-size-4xl);
  margin-bottom: var(--space-lg);
}

h2 {
  font-size: var(--font-size-3xl);
  margin-bottom: var(--space-md);
}

h3 {
  font-size: var(--font-size-2xl);
  margin-bottom: var(--space-sm);
}

p {
  margin-top: 0;
  margin-bottom: var(--space-md);
}

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

a:hover, a:focus {
  color: var(--color-primary-dark);
  text-decoration: underline;
}

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

button {
  cursor: pointer;
  font-family: inherit;
  background: none;
  border: none;
  padding: 0;
}

/* ========== LAYOUT ========== */
/* Major layout components */

.container {
  width: 95%;
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--space-md);
}

.header {
  padding: var(--space-md) 0;
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  background-color: var(--color-surface-bg);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-border);
}

.footer {
  margin-top: auto;
  padding: var(--space-xl) 0;
  background-color: var(--color-surface-200);
  border-top: 1px solid var(--color-border);
}

.footer-content {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  text-align: center;
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
}

.posts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-lg);
  margin-top: var(--space-xl);
}

/* ========== MODULES ========== */
/* Reusable, modular components */

/* Card Module */
.card {
  --card-bg: var(--color-surface-100);
  background-color: var(--card-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px); /* Safari support */
  border-radius: var(--radius-card);
  padding: var(--space-lg);
  margin-bottom: var(--space-lg);
  box-shadow: var(--shadow-card);
  transition: 
    transform var(--transition-morph),
    box-shadow var(--transition-color);
  overflow: hidden;
  position: relative;
  view-transition-name: card-transition;
}

.card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(to right, var(--color-primary), var(--color-accent));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-morph);
}

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

.card-title {
  margin-top: 0;
  margin-bottom: var(--space-md);
  color: var(--color-primary);
}

.card-meta {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  margin-bottom: var(--space-md);
  font-size: var(--font-size-sm);
  color: var(--color-text-tertiary);
}

.card-content {
  color: var(--color-text-secondary);
}

/* Button Module */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-xs) var(--space-md);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  line-height: 1.4;
  text-align: center;
  white-space: nowrap;
  vertical-align: middle;
  border-radius: var(--radius-button);
  transition: all var(--transition-color);
  cursor: pointer;
  user-select: none;
}

.btn-primary {
  background-color: var(--color-primary);
  color: white;
  border: none;
}

.btn-primary:hover, .btn-primary:focus {
  background-color: var(--color-primary-dark);
  color: white;
  text-decoration: none;
}

.btn-secondary {
  background-color: transparent;
  color: var(--color-primary);
  border: 1px solid var(--color-primary);
}

.btn-secondary:hover, .btn-secondary:focus {
  background-color: var(--color-primary);
  color: white;
  text-decoration: none;
}

/* Theme Switch */
.theme-switch-wrapper {
  display: flex;
  align-items: center;
}

.theme-switch-label {
  height: 36px;
  width: 36px;
  cursor: pointer;
  border-radius: 50%;
  background-color: var(--color-surface-200);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: 
    background-color var(--transition-color),
    transform var(--transition-transform);
}

.theme-switch-label:hover {
  transform: scale(1.1);
  background-color: var(--color-surface-300);
}

#theme-switch:checked + .theme-switch-label svg {
  fill: var(--color-primary);
}

/* Section Module */
.section-title {
  position: relative;
  display: inline-block;
  margin-top: var(--space-2xl);
  margin-bottom: var(--space-xl);
  padding-bottom: var(--space-xs);
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 50%;
  height: 3px;
  background-color: var(--color-primary);
  border-radius: 1.5px;
}

/* Crypto Tag */
.crypto-tag {
  display: inline-flex;
  align-items: center;
  padding: var(--space-2xs) var(--space-xs);
  background-color: var(--color-surface-200);
  border-radius: var(--radius-sm);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  margin-right: var(--space-xs);
  margin-bottom: var(--space-xs);
}

.crypto-tag.positive {
  background-color: oklch(95% 0.1 150);
  color: oklch(40% 0.2 150);
}

.crypto-tag.negative {
  background-color: oklch(95% 0.1 30);
  color: oklch(40% 0.2 30);
}

/* Newsletter Form */
.newsletter-section {
  margin: var(--space-2xl) 0;
}

.newsletter-content {
  margin-bottom: var(--space-lg);
}

.newsletter-form-container {
  display: flex;
  justify-content: center;
  width: 100%;
}

.newsletter-form-wrapper {
  display: flex;
  flex-direction: column;
  width: 100%;
  max-width: 500px;
  gap: var(--space-sm);
}

@media (min-width: 768px) {
  .newsletter-form-wrapper {
    flex-direction: row;
    align-items: flex-end;
  }
  
  .newsletter-form-wrapper .form-input {
    flex: 1;
    margin-right: var(--space-sm);
    margin-bottom: 0;
  }
}

.newsletter-form {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  max-width: 500px;
  margin: var(--space-xl) auto;
  padding: var(--space-lg);
  background-color: var(--color-surface-100);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.form-label {
  font-weight: var(--font-weight-medium);
  color: var(--color-text);
}

.form-input {
  padding: var(--space-sm);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background-color: var(--color-surface-bg);
  color: var(--color-text);
  transition: border-color var(--transition-color);
}

.form-input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(var(--color-primary), 0.1);
}

/* Fallback UI */
.fallback-ui {
  padding: var(--space-2xl);
  text-align: center;
  background-color: var(--color-surface-100);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  animation: fade-in var(--transition-fade);
}

@keyframes fade-in {
  from { opacity: 0; }
  to { opacity: 1; }
}

/* ========== STATE ========== */
/* State changes */

.is-hidden {
  display: none !important;
}

.is-visible {
  display: block !important;
}

.is-loading {
  position: relative;
  pointer-events: none;
  opacity: 0.7;
}

.is-loading::after {
  content: '';
  position: absolute;
  top: calc(50% - 10px);
  left: calc(50% - 10px);
  width: 20px;
  height: 20px;
  border: 2px solid var(--color-border);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spinner 0.6s linear infinite;
}

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

/* ========== RESPONSIVE ========== */
/* Media queries for responsive design */

@media (min-width: 768px) {
  .footer-content {
    flex-direction: row;
    justify-content: space-between;
    text-align: left;
  }
  
  .newsletter-form {
    flex-direction: row;
    align-items: flex-end;
  }
  
  .form-group {
    flex: 1;
  }
}

@media (max-width: 767px) {
  h1 {
    font-size: var(--font-size-3xl);
  }
  
  h2 {
    font-size: var(--font-size-2xl);
  }
  
  .card {
    padding: var(--space-md);
  }
}

/* ========== UTILITIES ========== */
/* Utility classes */

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

.mt-0 { margin-top: 0; }
.mt-sm { margin-top: var(--space-sm); }
.mt-md { margin-top: var(--space-md); }
.mt-lg { margin-top: var(--space-lg); }
.mt-xl { margin-top: var(--space-xl); }

.mb-0 { margin-bottom: 0; }
.mb-sm { margin-bottom: var(--space-sm); }
.mb-md { margin-bottom: var(--space-md); }
.mb-lg { margin-bottom: var(--space-lg); }
.mb-xl { margin-bottom: var(--space-xl); }

.font-xs { font-size: var(--font-size-xs); }
.font-sm { font-size: var(--font-size-sm); }
.font-md { font-size: var(--font-size-md); }
.font-lg { font-size: var(--font-size-lg); }
.font-xl { font-size: var(--font-size-xl); }

.weight-regular { font-weight: var(--font-weight-regular); }
.weight-medium { font-weight: var(--font-weight-medium); }
.weight-semibold { font-weight: var(--font-weight-semibold); }
.weight-bold { font-weight: var(--font-weight-bold); }

.color-primary { color: var(--color-primary); }
.color-text { color: var(--color-text); }
.color-text-secondary { color: var(--color-text-secondary); }
.color-text-tertiary { color: var(--color-text-tertiary); }

/* ========== ANIMATIONS ========== */
/* Animation keyframes */

@keyframes slide-up {
  from { transform: translateY(20px); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}

@keyframes pulse {
  0% { transform: scale(1); }
  50% { transform: scale(1.05); }
  100% { transform: scale(1); }
}

.animate-slide-up {
  animation: slide-up 0.5s ease forwards;
}

.animate-pulse {
  animation: pulse 2s infinite;
}

/* Support for view transitions API */
@supports (view-transition-name: none) {
  @keyframes -ua-view-transition-fade-in {
    from { opacity: 0; }
    to { opacity: 1; }
  }
  
  @keyframes -ua-view-transition-fade-out {
    from { opacity: 1; }
    to { opacity: 0; }
  }
  
  ::view-transition-old(card-transition) {
    animation: -ua-view-transition-fade-out 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  }
  
  ::view-transition-new(card-transition) {
    animation: -ua-view-transition-fade-in 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  }
}