/* ===============================================
   MAIN.CSS - Styles principaux et layout
   =============================================== */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=JetBrains+Mono:wght@400;500;600&display=swap');

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

html {
  scroll-behavior: smooth;
  overflow-x: hidden;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--background);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  position: relative;
}

/* Background animé avec mesh gradient */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--gradient-mesh);
  z-index: -1;
  animation: meshMove 20s ease infinite;
}

@keyframes meshMove {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.8; }
}

/* ========== TYPOGRAPHY ========== */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.2;
  color: var(--text-primary);
}

h1 { font-size: clamp(2.5rem, 5vw, 4rem); }
h2 { font-size: clamp(2rem, 4vw, 3rem); }
h3 { font-size: clamp(1.5rem, 3vw, 2rem); }
h4 { font-size: clamp(1.25rem, 2.5vw, 1.75rem); }

p {
  color: var(--text-secondary);
  font-size: 1.1rem;
}

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

code, pre {
  font-family: 'JetBrains Mono', monospace;
  background: var(--surface);
  padding: 0.2em 0.5em;
  border-radius: 4px;
  font-size: 0.9em;
}

/* ========== GLASSMORPHISM EFFECTS ========== */
.glass {
  background: var(--surface);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border: 1px solid var(--border);
  border-radius: 16px;
  box-shadow: var(--shadow-md);
  transition: all var(--transition-normal);
}

.glass:hover {
  background: var(--surface-hover);
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
}

.glass-strong {
  background: var(--surface-hover);
  backdrop-filter: blur(30px) saturate(200%);
  -webkit-backdrop-filter: blur(30px) saturate(200%);
  border: 1px solid var(--border);
  border-radius: 20px;
  box-shadow: var(--shadow-lg);
}

/* ========== NAVIGATION ========== */
nav {
  position: fixed;
  top: 0;
  width: 100%;
  z-index: 1000;
  padding: 1.5rem 0;
  background: var(--surface);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  transition: all var(--transition-normal);
}

nav.scrolled {
  padding: 1rem 0;
  box-shadow: var(--shadow-md);
}

.nav-container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: 1.5rem;
  font-weight: 800;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  cursor: pointer;
  transition: transform var(--transition-fast);
}

.logo:hover {
  transform: scale(1.05);
}

.nav-links {
  display: flex;
  gap: 2rem;
  list-style: none;
  align-items: center;
}

.nav-links a {
  color: var(--text-primary);
  font-weight: 500;
  padding: 0.5rem 1rem;
  border-radius: 8px;
  position: relative;
  transition: all var(--transition-fast);
}

.nav-links a:hover {
  color: var(--primary);
  background: var(--surface);
}

.nav-links a.active {
  color: var(--primary);
  background: var(--surface);
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 0;
  height: 2px;
  background: var(--gradient-primary);
  transform: translateX(-50%);
  transition: width var(--transition-fast);
}

.nav-links a:hover::after,
.nav-links a.active::after {
  width: 80%;
}

/* Hamburger Menu */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 0.5rem;
  z-index: 1001;
}

.hamburger span {
  width: 25px;
  height: 3px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: all var(--transition-fast);
}

.hamburger.active span:nth-child(1) {
  transform: rotate(45deg) translate(8px, 8px);
}

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

.hamburger.active span:nth-child(3) {
  transform: rotate(-45deg) translate(7px, -7px);
}

/* Theme Toggle */
#theme-toggle {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 50%;
  width: 45px;
  height: 45px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
  box-shadow: var(--shadow-sm);
}

#theme-toggle:hover {
  transform: scale(1.1) rotate(15deg);
  box-shadow: var(--shadow-glow);
}

#theme-toggle svg {
  width: 24px;
  height: 24px;
  color: var(--primary);
}

/* ========== CONTAINER & LAYOUT ========== */
.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 2rem;
}

.section {
  padding: 6rem 0;
  position: relative;
}

.section-title {
  text-align: center;
  margin-bottom: 4rem;
  position: relative;
}

.section-title h2 {
  margin-bottom: 1rem;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.section-title::after {
  content: '';
  display: block;
  width: 100px;
  height: 4px;
  background: var(--gradient-primary);
  margin: 2rem auto 0;
  border-radius: 2px;
}

/* ========== BUTTONS ========== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 1rem 2rem;
  border: none;
  border-radius: 12px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
  z-index: 1;
}

.btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--gradient-primary);
  z-index: -1;
  transition: transform var(--transition-normal);
}

.btn:hover::before {
  transform: scale(1.05);
}

.btn-primary {
  background: var(--gradient-primary);
  color: white;
  box-shadow: var(--shadow-md);
}

.btn-primary:hover {
  box-shadow: var(--shadow-glow);
  transform: translateY(-2px);
}

.btn-secondary {
  background: var(--surface);
  color: var(--text-primary);
  border: 2px solid var(--border);
  box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
  background: var(--surface-hover);
  border-color: var(--primary);
  transform: translateY(-2px);
}

.btn-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: var(--surface);
  border: 1px solid var(--border);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-icon:hover {
  background: var(--primary);
  color: white;
  transform: scale(1.1);
  box-shadow: var(--shadow-glow);
}

/* ========== GRID LAYOUTS ========== */
.grid {
  display: grid;
  gap: 2rem;
}

.grid-2 {
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.grid-3 {
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.grid-4 {
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

/* ========== SCROLL INDICATOR ========== */
.scroll-indicator {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  cursor: pointer;
  animation: bounce 2s infinite;
}

.scroll-indicator span {
  font-size: 0.9rem;
  color: var(--text-secondary);
  font-weight: 500;
}

.scroll-indicator::after {
  content: '';
  width: 24px;
  height: 24px;
  border-left: 2px solid var(--primary);
  border-bottom: 2px solid var(--primary);
  transform: rotate(-45deg);
}

@keyframes bounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-50%) translateY(10px); }
}

/* ========== LOADING SCREEN ========== */
.loading-screen {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--background);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  transition: opacity var(--transition-slow), visibility var(--transition-slow);
}

.loading-screen.hidden {
  opacity: 0;
  visibility: hidden;
}

.loader {
  width: 80px;
  height: 80px;
  border: 4px solid var(--surface);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

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

/* ========== RESPONSIVE ========== */
@media (max-width: 992px) {
  .nav-links {
    position: fixed;
    top: 0;
    right: -100%;
    height: 100vh;
    width: 300px;
    background: var(--surface);
    backdrop-filter: blur(30px);
    flex-direction: column;
    justify-content: center;
    align-items: flex-start;
    padding: 2rem;
    box-shadow: var(--shadow-lg);
    transition: right var(--transition-normal);
  }

  .nav-links.active {
    right: 0;
  }

  .hamburger {
    display: flex;
  }

  .section {
    padding: 4rem 0;
  }

  .container {
    padding: 0 1rem;
  }
}

@media (max-width: 768px) {
  h1 { font-size: 2rem; }
  h2 { font-size: 1.75rem; }
  h3 { font-size: 1.5rem; }

  .grid {
    gap: 1.5rem;
  }

  .btn {
    padding: 0.875rem 1.5rem;
    font-size: 0.95rem;
  }
}

@media (max-width: 576px) {
  .nav-container {
    padding: 0 1rem;
  }

  .section {
    padding: 3rem 0;
  }

  .section-title h2 {
    font-size: 1.5rem;
  }
}