/* ============================================
   CRYPTO HARDWARE HUB - DESIGN SYSTEM PRO
   Standards: SaaS B2B / Fintech Premium
   ============================================ */

/* === VARIABLES === */
:root {
  /* Palette - Mode Sombre (defaut) */
  --color-bg-primary: #0a0a0f;
  --color-bg-secondary: #111118;
  --color-bg-tertiary: #1a1a24;
  --color-bg-elevated: #22222e;
  
  --color-text-primary: #fafafa;
  --color-text-secondary: #a1a1aa;
  --color-text-tertiary: #71717a;
  --color-text-muted: #52525b;
  
  --color-accent: #3b82f6;
  --color-accent-light: #60a5fa;
  --color-accent-dark: #2563eb;
  --color-accent-subtle: rgba(59, 130, 246, 0.1);
  
  --color-border: #27272a;
  --color-border-subtle: #18181b;
  
  --shadow-header: rgba(10, 10, 15, 0.95);
  
  /* Typography */
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  
  /* Scale typographique */
  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 1.875rem;
  --text-4xl: 2.25rem;
  --text-5xl: 3rem;
  
  /* Espacements */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  
  /* Layout */
  --max-width: 1200px;
  --max-width-content: 720px;
  --max-width-wide: 960px;
  
  /* Bordures */
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;
  --radius-xl: 12px;
  
  /* Ombres */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 20px rgba(59, 130, 246, 0.15);
}

/* Mode Clair */
[data-theme="light"] {
  --color-bg-primary: #fafafa;
  --color-bg-secondary: #ffffff;
  --color-bg-tertiary: #f4f4f5;
  --color-bg-elevated: #e4e4e7;
  
  --color-text-primary: #18181b;
  --color-text-secondary: #52525b;
  --color-text-tertiary: #71717a;
  --color-text-muted: #a1a1aa;
  
  --color-accent: #2563eb;
  --color-accent-light: #3b82f6;
  --color-accent-dark: #1d4ed8;
  --color-accent-subtle: rgba(37, 99, 235, 0.1);
  
  --color-border: #e4e4e7;
  --color-border-subtle: #d4d4d8;
  
  --shadow-header: rgba(255, 255, 255, 0.95);
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
  --shadow-glow: 0 0 20px rgba(37, 99, 235, 0.15);
}

/* === RESET & BASE === */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-family);
  font-size: var(--text-base);
  line-height: 1.7;
  color: var(--color-text-primary);
  background-color: var(--color-bg-primary);
  transition: background-color 0.3s ease, color 0.3s ease;
}

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

a {
  color: var(--color-accent-light);
  text-decoration: none;
  transition: color 0.15s ease;
}

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

/* === LAYOUT === */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.container-narrow {
  max-width: 780px;
}

.container-wide {
  max-width: var(--max-width-wide);
}

/* === HEADER === */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-bg-secondary);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
  transition: background-color 0.3s ease;
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.logo-icon {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--color-accent-dark), var(--color-accent));
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: var(--text-lg);
  color: white;
}

.logo-text {
  font-size: var(--text-lg);
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--color-text-primary);
}

.main-nav {
  display: flex;
  align-items: center;
  gap: var(--space-8);
}

.main-nav a {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-secondary);
  padding: var(--space-2) 0;
  border-bottom: 2px solid transparent;
  transition: all 0.15s ease;
}

.main-nav a:hover {
  color: var(--color-text-primary);
  border-bottom-color: var(--color-accent);
}

/* === THEME TOGGLE FIX === */
.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background: var(--color-bg-tertiary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  cursor: pointer;
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text-secondary);
  transition: all 0.15s ease;
  position: relative;
  overflow: hidden;
}

.theme-toggle:hover {
  background: var(--color-bg-elevated);
  color: var(--color-text-primary);
  border-color: var(--color-accent);
}

.theme-toggle:active {
  transform: scale(0.95);
}

.mobile-menu-toggle {
  display: none;
}

.theme-icon-light,
.theme-icon-dark {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  transition: opacity 0.2s ease, transform 0.2s ease;
  font-size: 14px;
}

.theme-icon-light {
  opacity: 0;
  transform: translate(-50%, -50%) scale(0.8);
}

.theme-icon-dark {
  opacity: 1;
  transform: translate(-50%, -50%) scale(1);
}

[data-theme="light"] .theme-icon-light {
  opacity: 1;
  transform: translate(-50%, -50%) scale(1);
}

[data-theme="light"] .theme-icon-dark {
  opacity: 0;
  transform: translate(-50%, -50%) scale(0.8);
}

/* === HERO === */
.hero {
  padding: var(--space-24) 0;
  text-align: center;
  background: linear-gradient(180deg, var(--color-bg-secondary) 0%, var(--color-bg-primary) 100%);
  border-bottom: 1px solid var(--color-border);
}

.hero-content {
  max-width: 800px;
  margin: 0 auto;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  background: var(--color-accent-subtle);
  border: 1px solid rgba(59, 130, 246, 0.2);
  border-radius: 100px;
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--color-accent-light);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-6);
}

.hero h1 {
  font-size: var(--text-5xl);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin-bottom: var(--space-6);
  background: linear-gradient(135deg, var(--color-text-primary) 0%, var(--color-text-secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: var(--text-xl);
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: var(--space-10);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
  text-align: center;
}

.hero-cta {
  display: flex;
  gap: var(--space-4);
  justify-content: center;
  flex-wrap: wrap;
}

/* === BUTTONS === */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  font-size: var(--text-sm);
  font-weight: 600;
  border-radius: var(--radius-md);
  transition: all 0.15s ease;
  cursor: pointer;
  border: none;
}

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

.btn-primary:hover {
  background: var(--color-accent-light);
  transform: translateY(-1px);
  box-shadow: var(--shadow-glow);
  color: white;
}

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

.btn-secondary:hover {
  background: var(--color-bg-tertiary);
  border-color: var(--color-text-muted);
  color: var(--color-text-primary);
}

.btn-large {
  padding: var(--space-4) var(--space-8);
  font-size: var(--text-base);
}

/* === SECTIONS === */
.section {
  padding: var(--space-20) 0;
}

.section-first {
  padding-top: var(--space-16);
}

.section-header {
  text-align: center;
  margin-bottom: var(--space-16);
}

.section-title {
  font-size: var(--text-3xl);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-4);
  color: var(--color-text-primary);
}

.section-subtitle {
  font-size: var(--text-lg);
  color: var(--color-text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

/* === ARTICLES GRID === */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-6);
}

.article-card {
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  transition: all 0.2s ease;
}

.article-card:hover {
  transform: translateY(-2px);
  border-color: var(--color-border-subtle);
  box-shadow: var(--shadow-lg);
}

.article-meta {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  margin-bottom: var(--space-4);
}

.category {
  display: inline-flex;
  padding: var(--space-1) var(--space-3);
  background: var(--color-accent-subtle);
  color: var(--color-accent-light);
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-radius: var(--radius-sm);
}

.read-time {
  font-size: var(--text-sm);
  color: var(--color-text-tertiary);
}

.article-card h3 {
  font-size: var(--text-xl);
  font-weight: 600;
  line-height: 1.4;
  margin-bottom: var(--space-3);
  letter-spacing: -0.01em;
  color: var(--color-text-primary);
}

.article-card p {
  color: var(--color-text-secondary);
  font-size: var(--text-base);
  line-height: 1.6;
  margin-bottom: var(--space-4);
}

.read-more {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-accent);
}

.read-more:hover {
  color: var(--color-accent-light);
}

/* === LEAD MAGNET === */
.lead-magnet {
  padding: var(--space-20) 0;
  background: var(--color-bg-secondary);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.lead-content {
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: var(--space-16);
  align-items: center;
}

.lead-text h2 {
  font-size: var(--text-3xl);
  font-weight: 700;
  margin-bottom: var(--space-4);
  letter-spacing: -0.02em;
  color: var(--color-text-primary);
}

.lead-text > p {
  font-size: var(--text-lg);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-6);
}

.lead-features {
  list-style: none;
  margin-bottom: var(--space-8);
}

.lead-features li {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-2) 0;
  color: var(--color-text-secondary);
}

.lead-visual {
  display: flex;
  align-items: center;
  justify-content: center;
}

.preview-box {
  width: 200px;
  height: 240px;
  background: var(--color-bg-tertiary);
  border: 2px dashed var(--color-border);
  border-radius: var(--radius-lg);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-4);
}

.preview-icon {
  width: 64px;
  height: 64px;
  background: var(--color-accent-subtle);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-2xl);
  color: var(--color-accent-light);
}

.preview-label {
  font-size: var(--text-sm);
  color: var(--color-text-tertiary);
  font-weight: 500;
}

/* === NEWSLETTER === */
.newsletter {
  padding: var(--space-20) 0;
  text-align: center;
}

.newsletter h2 {
  font-size: var(--text-3xl);
  font-weight: 700;
  margin-bottom: var(--space-4);
  color: var(--color-text-primary);
}

.newsletter > p {
  color: var(--color-text-secondary);
  font-size: var(--text-lg);
  margin-bottom: var(--space-8);
}

.newsletter-form {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  max-width: 480px;
  margin: 0 auto var(--space-4);
}

.newsletter-form input {
  flex: 1;
  padding: var(--space-3) var(--space-4);
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text-primary);
  font-size: var(--text-base);
  transition: border-color 0.15s ease;
}

.newsletter-form input:focus {
  outline: none;
  border-color: var(--color-accent);
}

.newsletter-form input::placeholder {
  color: var(--color-text-muted);
}

.newsletter-note {
  font-size: var(--text-sm);
  color: var(--color-text-tertiary);
}

/* === FOOTER === */
.site-footer {
  padding: var(--space-12) 0;
  background: var(--color-bg-primary);
  border-top: 1px solid var(--color-border);
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-8);
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-weight: 600;
  color: var(--color-text-primary);
}

.footer-links {
  display: flex;
  gap: var(--space-8);
}

.footer-links a {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
}

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

.copyright {
  text-align: center;
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

/* === ARTICLE PAGE === */
.article-page {
  padding-bottom: var(--space-20);
}

.article-header {
  padding: var(--space-16) 0 var(--space-12);
  text-align: center;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: var(--space-12);
}

.article-header h1 {
  font-size: var(--text-4xl);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-6);
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
  color: var(--color-text-primary);
}

.article-meta-full {
  display: flex;
  justify-content: center;
  gap: var(--space-6);
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  flex-wrap: wrap;
}

.article-content {
  max-width: var(--max-width-content);
  margin: 0 auto;
}

.article-content h2 {
  font-size: var(--text-2xl);
  font-weight: 600;
  margin-top: var(--space-12);
  margin-bottom: var(--space-4);
  letter-spacing: -0.01em;
  color: var(--color-text-primary);
}

.article-content h3 {
  font-size: var(--text-xl);
  font-weight: 600;
  margin-top: var(--space-8);
  margin-bottom: var(--space-3);
  color: var(--color-accent-light);
}

.article-content p {
  margin-bottom: var(--space-4);
  color: var(--color-text-secondary);
  line-height: 1.7;
}

.article-content ul,
.article-content ol {
  margin-bottom: var(--space-4);
  padding-left: var(--space-6);
}

.article-content li {
  margin-bottom: var(--space-2);
  color: var(--color-text-secondary);
}

.article-content strong {
  color: var(--color-text-primary);
  font-weight: 600;
}

.article-content table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--space-6) 0;
  font-size: var(--text-sm);
  background: var(--color-bg-secondary);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.article-content th {
  background: var(--color-bg-tertiary);
  padding: var(--space-3) var(--space-4);
  text-align: left;
  font-weight: 600;
  color: var(--color-text-primary);
  border-bottom: 1px solid var(--color-border);
}

.article-content td {
  padding: var(--space-3) var(--space-4);
  border-bottom: 1px solid var(--color-border);
  color: var(--color-text-secondary);
}

.article-content tr:last-child td {
  border-bottom: none;
}

.article-content blockquote {
  border-left: 3px solid var(--color-accent);
  padding-left: var(--space-6);
  margin: var(--space-6) 0;
  font-style: italic;
  color: var(--color-text-tertiary);
}

/* === RESPONSIVE === */
@media (max-width: 768px) {
  :root {
    --text-5xl: 2.25rem;
    --text-4xl: 1.875rem;
    --text-3xl: 1.5rem;
  }
  
  .container {
    padding: 0 var(--space-4);
  }
  
  .hero {
    padding: var(--space-16) 0;
  }
  
  .hero h1 {
    font-size: var(--text-4xl);
  }
  
  .hero-subtitle {
    font-size: var(--text-lg);
  }
  
  .articles-grid {
    grid-template-columns: 1fr;
  }
  
  .lead-content {
    grid-template-columns: 1fr;
    gap: var(--space-8);
  }
  
  .newsletter-form {
    flex-direction: column;
  }
  
  .main-nav {
    display: none;
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    background: var(--color-bg-secondary);
    flex-direction: column;
    padding: var(--space-4);
    border-bottom: 1px solid var(--color-border);
    gap: var(--space-4);
  }
  
  .main-nav.active {
    display: flex;
  }
  
  .mobile-menu-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: var(--color-bg-tertiary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    cursor: pointer;
    font-size: var(--text-lg);
    color: var(--color-text-secondary);
  }
  
  .footer-content {
    flex-direction: column;
    gap: var(--space-6);
    text-align: center;
  }
  
  .article-header h1 {
    font-size: var(--text-3xl);
  }
  
  .article-meta-full {
    flex-wrap: wrap;
    gap: var(--space-3);
  }
}

/* === UTILITIES === */
.text-center { text-align: center; }
.text-muted { color: var(--color-text-muted); }
.text-primary { color: var(--color-text-primary); }

.mt-1 { margin-top: var(--space-sm); }
.mt-2 { margin-top: var(--space-md); }
.mt-3 { margin-top: var(--space-lg); }

.mb-1 { margin-bottom: var(--space-sm); }
.mb-2 { margin-bottom: var(--space-md); }
.mb-3 { margin-bottom: var(--space-lg); }

/* === COOKIE BANNER RGPD === */
.cookie-banner {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--color-bg-elevated);
    border-top: 1px solid var(--color-border);
    padding: 1rem 2rem;
    z-index: 1000;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
    box-shadow: 0 -4px 20px rgba(0,0,0,0.3);
}

.cookie-banner p {
    margin: 0;
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    flex: 1;
    min-width: 300px;
}

.cookie-banner a {
    color: var(--color-accent);
    text-decoration: underline;
}

.cookie-banner-buttons {
    display: flex;
    gap: 0.75rem;
}

.cookie-banner-hidden {
    display: none !important;
}