/* ============================================
   THERMO PARIS - CSS Principal
   Palette: Noir/Gris foncé + Accents Orange/Rouge
   Mobile-first responsive design
   ============================================ */

/* Variables CSS */
:root {
  --color-bg-primary: #0d0d0d;
  --color-bg-secondary: #1a1a1a;
  --color-bg-tertiary: #252525;
  --color-text-primary: #f5f5f5;
  --color-text-secondary: #a0a0a0;
  --color-accent: #ff6b35;
  --color-accent-hover: #ff8c5a;
  --color-accent-dark: #e55a2b;
  --color-gradient-start: #ff6b35;
  --color-gradient-end: #ff3d00;
  --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-heading: 'Inter', sans-serif;
  --transition-fast: 0.2s ease;
  --transition-medium: 0.3s ease;
  --max-width: 1200px;
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-xxl: 5rem;
}

/* Reset & Base */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: var(--font-primary);
  background-color: var(--color-bg-primary);
  color: var(--color-text-primary);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

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

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

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

ul {
  list-style: none;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 600;
  line-height: 1.2;
  margin-bottom: var(--spacing-sm);
}

h1 {
  font-size: clamp(2rem, 5vw, 3.5rem);
}

h2 {
  font-size: clamp(1.5rem, 4vw, 2.5rem);
}

h3 {
  font-size: clamp(1.25rem, 3vw, 1.75rem);
}

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

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

/* Header & Navigation */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background-color: rgba(13, 13, 13, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-bg-tertiary);
}

.header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: var(--spacing-sm);
  padding-bottom: var(--spacing-sm);
}

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-text-primary);
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.logo span {
  color: var(--color-accent);
}

/* Mobile Menu Toggle */
.nav-toggle {
  display: flex;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--spacing-xs);
}

.nav-toggle span {
  width: 25px;
  height: 2px;
  background-color: var(--color-text-primary);
  transition: var(--transition-fast);
}

.nav-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.nav-toggle.active span:nth-child(2) {
  opacity: 0;
}

.nav-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* Navigation */
.nav {
  position: fixed;
  top: 60px;
  left: 0;
  right: 0;
  background-color: var(--color-bg-secondary);
  transform: translateY(-100%);
  opacity: 0;
  visibility: hidden;
  transition: var(--transition-medium);
}

.nav.active {
  transform: translateY(0);
  opacity: 1;
  visibility: visible;
}

.nav-list {
  display: flex;
  flex-direction: column;
  padding: var(--spacing-md);
}

.nav-list li {
  border-bottom: 1px solid var(--color-bg-tertiary);
}

.nav-list li:last-child {
  border-bottom: none;
}

.nav-list a {
  display: block;
  padding: var(--spacing-sm) 0;
  color: var(--color-text-primary);
  font-weight: 500;
  transition: color var(--transition-fast);
}

.nav-list a:hover,
.nav-list a.active {
  color: var(--color-accent);
}

/* Main Content */
main {
  flex: 1;
  margin-top: 60px;
}

/* Hero Section */
.hero {
  min-height: calc(100vh - 60px);
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: var(--spacing-xl) 0;
  background: linear-gradient(135deg, var(--color-bg-primary) 0%, var(--color-bg-secondary) 100%);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(circle at 30% 50%, rgba(255, 107, 53, 0.1) 0%, transparent 50%);
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 1;
}

.hero h1 {
  margin-bottom: var(--spacing-md);
}

.hero h1 .highlight {
  background: linear-gradient(135deg, var(--color-gradient-start), var(--color-gradient-end));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: clamp(1rem, 2.5vw, 1.25rem);
  color: var(--color-text-secondary);
  max-width: 600px;
  margin: 0 auto var(--spacing-lg);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-sm) var(--spacing-lg);
  font-size: 1rem;
  font-weight: 600;
  border-radius: 8px;
  border: none;
  cursor: pointer;
  transition: var(--transition-medium);
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-gradient-start), var(--color-gradient-end));
  color: white;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 30px rgba(255, 107, 53, 0.3);
  color: white;
}

.btn-secondary {
  background: transparent;
  color: var(--color-text-primary);
  border: 2px solid var(--color-bg-tertiary);
}

.btn-secondary:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.btn-whatsapp {
  background: #25D366;
  color: white;
  font-size: 1.1rem;
  padding: var(--spacing-md) var(--spacing-xl);
}

.btn-whatsapp:hover {
  background: #128C7E;
  transform: translateY(-2px);
  box-shadow: 0 10px 30px rgba(37, 211, 102, 0.3);
  color: white;
}

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

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

.section-header h2 {
  margin-bottom: var(--spacing-sm);
}

.section-header p {
  max-width: 600px;
  margin: 0 auto;
}

/* Cards Grid */
.cards-grid {
  display: grid;
  gap: var(--spacing-lg);
}

.card {
  background: var(--color-bg-secondary);
  border-radius: 12px;
  padding: var(--spacing-lg);
  border: 1px solid var(--color-bg-tertiary);
  transition: var(--transition-medium);
}

.card:hover {
  border-color: var(--color-accent);
  transform: translateY(-5px);
}

.card-icon {
  width: 60px;
  height: 60px;
  border-radius: 12px;
  background: linear-gradient(135deg, rgba(255, 107, 53, 0.2), rgba(255, 61, 0, 0.2));
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--spacing-md);
  font-size: 1.5rem;
}

.card h3 {
  margin-bottom: var(--spacing-sm);
  color: var(--color-text-primary);
}

/* Features List */
.features-list {
  margin-top: var(--spacing-md);
}

.features-list li {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-xs) 0;
  color: var(--color-text-secondary);
}

.features-list li::before {
  content: '✓';
  color: var(--color-accent);
  font-weight: bold;
}

/* Pricing */
.pricing-grid {
  display: grid;
  gap: var(--spacing-lg);
}

.pricing-card {
  background: var(--color-bg-secondary);
  border-radius: 16px;
  padding: var(--spacing-xl);
  border: 1px solid var(--color-bg-tertiary);
  text-align: center;
  position: relative;
  transition: var(--transition-medium);
}

.pricing-card.featured {
  border-color: var(--color-accent);
}

.pricing-card.featured::before {
  content: 'Populaire';
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, var(--color-gradient-start), var(--color-gradient-end));
  color: white;
  padding: var(--spacing-xs) var(--spacing-md);
  border-radius: 20px;
  font-size: 0.875rem;
  font-weight: 600;
}

.pricing-card:hover {
  transform: translateY(-5px);
}

.pricing-card h3 {
  color: var(--color-text-primary);
}

.price {
  font-size: 3rem;
  font-weight: 700;
  color: var(--color-text-primary);
  margin: var(--spacing-md) 0;
}

.price span {
  font-size: 1rem;
  color: var(--color-text-secondary);
  font-weight: 400;
}

.pricing-features {
  text-align: left;
  margin: var(--spacing-lg) 0;
}

.pricing-features li {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-xs) 0;
  color: var(--color-text-secondary);
}

.pricing-features li::before {
  content: '✓';
  color: var(--color-accent);
  font-weight: bold;
}

/* About Section */
.about-content {
  display: grid;
  gap: var(--spacing-xl);
}

.about-text h2 {
  margin-bottom: var(--spacing-md);
}

.about-image {
  border-radius: 16px;
  overflow: hidden;
  background: var(--color-bg-secondary);
  aspect-ratio: 16/9;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-secondary);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-md);
  margin-top: var(--spacing-xl);
}

.stat-item {
  text-align: center;
  padding: var(--spacing-md);
  background: var(--color-bg-secondary);
  border-radius: 12px;
}

.stat-number {
  font-size: 2rem;
  font-weight: 700;
  color: var(--color-accent);
  display: block;
}

.stat-label {
  color: var(--color-text-secondary);
  font-size: 0.875rem;
}

/* Contact Section */
.contact-content {
  text-align: center;
  max-width: 600px;
  margin: 0 auto;
}

.contact-content h2 {
  margin-bottom: var(--spacing-md);
}

.contact-content > p {
  margin-bottom: var(--spacing-xl);
}

.contact-info {
  margin-top: var(--spacing-xl);
  padding: var(--spacing-lg);
  background: var(--color-bg-secondary);
  border-radius: 12px;
}

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

/* Footer */
.footer {
  background: var(--color-bg-secondary);
  padding: var(--spacing-xl) 0 var(--spacing-lg);
  margin-top: auto;
  border-top: 1px solid var(--color-bg-tertiary);
}

.footer-content {
  display: grid;
  gap: var(--spacing-lg);
  text-align: center;
}

.footer-logo {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-text-primary);
}

.footer-logo span {
  color: var(--color-accent);
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--spacing-md);
}

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

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

.footer-bottom {
  text-align: center;
  padding-top: var(--spacing-lg);
  margin-top: var(--spacing-lg);
  border-top: 1px solid var(--color-bg-tertiary);
}

.footer-bottom p {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
}

/* Page Header */
.page-header {
  padding: var(--spacing-xxl) 0 var(--spacing-xl);
  text-align: center;
  background: linear-gradient(135deg, var(--color-bg-primary) 0%, var(--color-bg-secondary) 100%);
}

.page-header h1 {
  margin-bottom: var(--spacing-sm);
}

/* ============================================
   RESPONSIVE DESIGN - Tablet & Desktop
   ============================================ */

@media (min-width: 768px) {
  .nav-toggle {
    display: none;
  }

  .nav {
    position: static;
    transform: none;
    opacity: 1;
    visibility: visible;
    background: transparent;
  }

  .nav-list {
    flex-direction: row;
    padding: 0;
    gap: var(--spacing-lg);
  }

  .nav-list li {
    border-bottom: none;
  }

  .nav-list a {
    padding: var(--spacing-xs) 0;
  }

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

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

  .about-content {
    grid-template-columns: 1fr 1fr;
    align-items: center;
  }

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

  .footer-content {
    grid-template-columns: repeat(3, 1fr);
    text-align: left;
  }

  .footer-links {
    justify-content: flex-start;
  }
}

@media (min-width: 1024px) {
  .cards-grid {
    grid-template-columns: repeat(3, 1fr);
  }

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

/* ============================================
   UTILITIES
   ============================================ */

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

.text-accent {
  color: var(--color-accent);
}

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

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

/* Thermal gradient effect */
.thermal-gradient {
  background: linear-gradient(135deg,
    #1a0a2e 0%,
    #3d1a5c 20%,
    #8b2942 40%,
    #d4543c 60%,
    #f4a735 80%,
    #fff9c4 100%
  );
}

/* Image placeholder styling */
.image-placeholder {
  background: var(--color-bg-tertiary);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-secondary);
  font-size: 0.875rem;
  min-height: 200px;
  border-radius: 8px;
}