/* ============================================================
   Jean-François GUÉRITTE — Personal Site
   Modern, minimal, refined dark theme
   ============================================================ */

/* --- Design Tokens --- */
:root {
  --bg: #07070a;
  --bg-surface: #0e0e14;
  --bg-card: rgba(255, 255, 255, 0.03);
  --bg-card-hover: rgba(255, 255, 255, 0.06);
  --border: rgba(255, 255, 255, 0.06);
  --border-hover: rgba(255, 255, 255, 0.12);

  --text: #e8e8ed;
  --text-secondary: #8b8b9e;
  --text-muted: #55556a;

  --accent: #6366f1;
  --accent-light: #818cf8;
  --accent-glow: rgba(99, 102, 241, 0.15);
  --cyan: #06b6d4;

  --font-heading: 'Space Grotesk', system-ui, sans-serif;
  --font-body: 'Inter', system-ui, sans-serif;

  --ease: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-out: cubic-bezier(0, 0, 0.2, 1);

  --container: 1120px;
  --gap: clamp(1.5rem, 4vw, 3rem);
}

/* --- Language Toggle System --- */
html[lang="fr"] .lang-en { display: none !important; }
html[lang="en"] .lang-fr { display: none !important; }

.lang-fr, .lang-en {
  transition: opacity 0.3s ease;
}

/* --- Reset --- */
*, *::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-body);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; height: auto; display: block; }
button { font: inherit; cursor: pointer; border: none; background: none; }

::selection {
  background: var(--accent);
  color: white;
}

/* --- Loader --- */
.loader {
  position: fixed;
  inset: 0;
  z-index: 1000;
  background: var(--bg);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: opacity 0.5s var(--ease), visibility 0.5s;
}

.loader.hidden {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.loader-text {
  display: flex;
  gap: 0.15em;
  font-family: var(--font-heading);
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 700;
  color: var(--text);
}

.loader-text span {
  display: inline-block;
  animation: loaderPulse 0.8s var(--ease) both;
}
.loader-text span:nth-child(2) { animation-delay: 0.08s; }
.loader-text span:nth-child(3) { animation-delay: 0.16s; }

@keyframes loaderPulse {
  0% { opacity: 0; transform: translateY(20px); filter: blur(8px); }
  100% { opacity: 1; transform: translateY(0); filter: blur(0); }
}

/* --- Custom Cursor (desktop only, subtle) --- */
.cursor, .cursor-dot { display: none; }

@media (hover: hover) and (pointer: fine) {
  .cursor {
    display: block;
    position: fixed;
    top: 0;
    left: 0;
    width: 36px;
    height: 36px;
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: 50%;
    pointer-events: none;
    z-index: 9999;
    transition: width 0.3s var(--ease), height 0.3s var(--ease), border-color 0.3s;
    transform: translate(-50%, -50%);
    will-change: transform;
  }
  .cursor-dot {
    display: block;
    position: fixed;
    top: 0;
    left: 0;
    width: 4px;
    height: 4px;
    background: var(--accent-light);
    border-radius: 50%;
    pointer-events: none;
    z-index: 10000;
    transform: translate(-50%, -50%);
    will-change: transform;
  }
  .cursor.hover {
    width: 56px;
    height: 56px;
    border-color: var(--accent);
    background: var(--accent-glow);
  }
}

/* --- Navigation --- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.25rem var(--gap);
  transition: background 0.3s, backdrop-filter 0.3s;
}

.nav.scrolled {
  background: rgba(7, 7, 10, 0.8);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid var(--border);
}

.nav-logo {
  font-family: var(--font-heading);
  font-size: 1.2rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text);
  transition: color 0.3s;
}
.nav-logo:hover { color: var(--accent-light); }

.nav-links {
  display: flex;
  gap: 2rem;
}

.nav-links a {
  font-size: 0.875rem;
  color: var(--text-secondary);
  transition: color 0.3s;
  position: relative;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--accent-light);
  transition: width 0.3s var(--ease);
}

.nav-links a:hover { color: var(--text); }
.nav-links a:hover::after { width: 100%; }

.nav-cta {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.875rem;
  color: var(--text-secondary);
  padding: 0.5rem 1rem;
  border: 1px solid var(--border);
  border-radius: 100px;
  transition: all 0.3s var(--ease);
}

.nav-cta:hover {
  color: var(--text);
  border-color: var(--border-hover);
  background: var(--bg-card);
}

.nav-right {
  display: flex;
  align-items: center;
  gap: 1rem;
}

/* --- Language Switcher --- */
.lang-switch {
  position: relative;
  display: flex;
  align-items: center;
  gap: 0;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 100px;
  padding: 3px;
  cursor: pointer;
  transition: border-color 0.3s;
}

.lang-switch:hover {
  border-color: var(--border-hover);
}

.lang-switch-option {
  position: relative;
  z-index: 1;
  font-family: var(--font-heading);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  padding: 0.35rem 0.65rem;
  color: var(--text-muted);
  transition: color 0.3s;
  user-select: none;
}

.lang-switch-option.active {
  color: var(--bg);
}

.lang-switch-slider {
  position: absolute;
  top: 3px;
  left: 3px;
  width: calc(50% - 3px);
  height: calc(100% - 6px);
  background: var(--accent-light);
  border-radius: 100px;
  transition: transform 0.35s var(--ease);
  pointer-events: none;
}

html[lang="en"] .lang-switch-slider {
  transform: translateX(100%);
}

/* --- About Languages Badge --- */
.about-languages {
  margin-top: 1.5rem;
}

.lang-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.875rem;
  color: var(--text-secondary);
  padding: 0.5rem 1rem;
  border: 1px solid var(--border);
  border-radius: 100px;
  background: var(--bg-card);
}

.lang-badge em {
  font-style: italic;
  color: var(--text-muted);
}

.lang-badge svg {
  color: var(--accent-light);
  flex-shrink: 0;
}

/* --- Container --- */
.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--gap);
}

/* --- Hero --- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  overflow: hidden;
}

.gradient-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(100px);
  opacity: 0.3;
  will-change: transform;
}

.orb-1 {
  width: 600px;
  height: 600px;
  background: var(--accent);
  top: -10%;
  right: -10%;
  animation: orbFloat1 20s ease-in-out infinite;
}

.orb-2 {
  width: 400px;
  height: 400px;
  background: var(--cyan);
  bottom: -5%;
  left: -5%;
  animation: orbFloat2 25s ease-in-out infinite;
}

.orb-3 {
  width: 300px;
  height: 300px;
  background: #a855f7;
  top: 40%;
  left: 30%;
  animation: orbFloat3 18s ease-in-out infinite;
}

@keyframes orbFloat1 {
  0%, 100% { transform: translate(0, 0) scale(1); }
  33% { transform: translate(-80px, 60px) scale(1.1); }
  66% { transform: translate(40px, -40px) scale(0.9); }
}
@keyframes orbFloat2 {
  0%, 100% { transform: translate(0, 0) scale(1); }
  33% { transform: translate(60px, -50px) scale(0.95); }
  66% { transform: translate(-30px, 30px) scale(1.05); }
}
@keyframes orbFloat3 {
  0%, 100% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(50px, -60px) scale(1.1); }
}

.noise {
  position: absolute;
  inset: 0;
  background: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.04'/%3E%3C/svg%3E");
  background-size: 256px;
  opacity: 0.5;
  pointer-events: none;
}

.hero-content {
  position: relative;
  text-align: center;
  max-width: 800px;
  padding: 0 var(--gap);
}

.hero-label {
  font-family: var(--font-body);
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent-light);
  margin-bottom: 1.5rem;
}

.hero-title {
  font-family: var(--font-heading);
  font-size: clamp(3rem, 8vw, 6rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  margin-bottom: 1.5rem;
}

.title-line {
  display: block;
}

.gradient-text {
  background: linear-gradient(135deg, var(--accent-light) 0%, var(--cyan) 50%, var(--accent-light) 100%);
  background-size: 200% auto;
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  animation: gradientShift 6s ease infinite;
}

@keyframes gradientShift {
  0%, 100% { background-position: 0% center; }
  50% { background-position: 100% center; }
}

.hero-description {
  font-size: clamp(1rem, 2vw, 1.25rem);
  color: var(--text-secondary);
  max-width: 560px;
  margin: 0 auto 2.5rem;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--font-body);
  font-size: 0.9375rem;
  font-weight: 500;
  padding: 0.8rem 1.75rem;
  border-radius: 100px;
  transition: all 0.35s var(--ease);
  position: relative;
  overflow: hidden;
}

.btn-primary {
  background: var(--accent);
  color: white;
  box-shadow: 0 0 0 0 var(--accent-glow);
}

.btn-primary:hover {
  background: var(--accent-light);
  box-shadow: 0 4px 24px var(--accent-glow);
  transform: translateY(-2px);
}

.btn-ghost {
  border: 1px solid var(--border);
  color: var(--text-secondary);
}

.btn-ghost:hover {
  border-color: var(--border-hover);
  color: var(--text);
  background: var(--bg-card);
}

.btn-large {
  font-size: 1.0625rem;
  padding: 1rem 2.25rem;
  gap: 0.75rem;
  background: var(--accent);
  color: white;
}

.btn-large:hover {
  background: var(--accent-light);
  box-shadow: 0 8px 32px var(--accent-glow);
  transform: translateY(-2px);
}

/* --- Scroll Indicator --- */
.scroll-indicator {
  position: absolute;
  bottom: 2.5rem;
  left: 50%;
  transform: translateX(-50%);
}

.scroll-line {
  width: 1px;
  height: 48px;
  background: linear-gradient(to bottom, var(--accent-light), transparent);
  animation: scrollPulse 2s ease-in-out infinite;
}

@keyframes scrollPulse {
  0%, 100% { opacity: 1; height: 48px; }
  50% { opacity: 0.3; height: 32px; }
}

/* --- Sections --- */
.section {
  padding: clamp(5rem, 12vw, 8rem) 0;
  position: relative;
}

.section-dark {
  background: var(--bg-surface);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.section-label {
  display: inline-block;
  font-size: 0.8125rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent-light);
  margin-bottom: 1rem;
}

.section-title {
  font-family: var(--font-heading);
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 600;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin-bottom: 3rem;
  color: var(--text);
}

/* --- About --- */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: clamp(3rem, 6vw, 5rem);
  align-items: center;
}

.image-wrapper {
  position: relative;
  aspect-ratio: 1;
  max-width: 320px;
  border-radius: 24px;
  overflow: hidden;
}

.image-wrapper img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s var(--ease);
}

.image-wrapper:hover img {
  transform: scale(1.03);
}

.image-border {
  position: absolute;
  inset: 0;
  border-radius: 24px;
  border: 1px solid var(--border);
  pointer-events: none;
}

.about-text {
  font-size: 1.0625rem;
  line-height: 1.75;
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
}

.about-stats {
  display: flex;
  gap: 2.5rem;
  margin-top: 2.5rem;
  padding-top: 2.5rem;
  border-top: 1px solid var(--border);
}

.stat { text-align: left; }

.stat-number {
  font-family: var(--font-heading);
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--text);
  line-height: 1;
}

.stat-suffix {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--accent-light);
}

.stat-label {
  display: block;
  font-size: 0.8125rem;
  color: var(--text-muted);
  margin-top: 0.4rem;
}

/* --- Marquee --- */
.marquee {
  padding: 1.5rem 0;
  overflow: hidden;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  background: var(--bg-surface);
}

.marquee-track {
  display: flex;
  align-items: center;
  gap: 2rem;
  white-space: nowrap;
  animation: marquee 30s linear infinite;
  width: max-content;
}

.marquee-track span {
  font-family: var(--font-heading);
  font-size: clamp(0.875rem, 1.5vw, 1rem);
  font-weight: 500;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.marquee-dot {
  width: 4px !important;
  height: 4px;
  border-radius: 50%;
  background: var(--accent);
  flex-shrink: 0;
  display: inline-block;
}

@keyframes marquee {
  0% { transform: translateX(0); }
  100% { transform: translateX(-50%); }
}

/* --- Expertise Grid --- */
.expertise-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.25rem;
}

.expertise-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 2rem;
  transition: all 0.4s var(--ease);
  position: relative;
  overflow: hidden;
}

.expertise-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(600px circle at var(--mouse-x, 50%) var(--mouse-y, 50%), var(--accent-glow), transparent 40%);
  opacity: 0;
  transition: opacity 0.4s;
}

.expertise-card:hover::before { opacity: 1; }

.expertise-card:hover {
  border-color: var(--border-hover);
  background: var(--bg-card-hover);
  transform: translateY(-4px);
}

.card-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: var(--accent-glow);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-light);
  margin-bottom: 1.25rem;
}

.expertise-card h3 {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
  color: var(--text);
}

.expertise-card p {
  font-size: 0.9375rem;
  line-height: 1.65;
  color: var(--text-secondary);
  position: relative;
}

/* --- Posts Grid --- */
.posts-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.25rem;
  margin-bottom: 3rem;
}

.post-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 20px;
  display: flex;
  flex-direction: column;
  transition: all 0.4s var(--ease);
  text-decoration: none;
  overflow: hidden;
}

.post-card:hover {
  border-color: var(--border-hover);
  background: var(--bg-card-hover);
  transform: translateY(-4px);
}

.post-accent {
  height: 3px;
  background: var(--card-gradient, linear-gradient(135deg, var(--accent), var(--cyan)));
  border-radius: 20px 20px 0 0;
  flex-shrink: 0;
  opacity: 0.7;
  transition: opacity 0.3s;
}

.post-card:hover .post-accent {
  opacity: 1;
}

.post-body {
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.post-date {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.02em;
}

.post-title {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 600;
  line-height: 1.35;
  color: var(--text);
  margin-bottom: 0.75rem;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.post-excerpt {
  font-size: 0.875rem;
  line-height: 1.6;
  color: var(--text-secondary);
  flex: 1;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.post-footer {
  margin-top: auto;
  padding-top: 1rem;
}

.post-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 0.75rem;
}

.post-tag {
  font-size: 0.7rem;
  font-weight: 500;
  color: var(--accent-light);
  background: var(--accent-glow);
  padding: 0.2rem 0.5rem;
  border-radius: 100px;
  letter-spacing: 0.01em;
}

.post-read-more {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--accent-light);
  transition: gap 0.3s var(--ease);
}

.post-card:hover .post-read-more { gap: 0.7rem; }

.posts-fallback {
  text-align: center;
  padding: 3rem;
  color: var(--text-secondary);
}

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

/* --- Loading skeleton for posts --- */
.post-skeleton {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 1.75rem;
  min-height: 220px;
}

.skeleton-line {
  height: 12px;
  background: linear-gradient(90deg, var(--border) 25%, var(--bg-card-hover) 50%, var(--border) 75%);
  background-size: 200% 100%;
  border-radius: 6px;
  animation: shimmer 1.5s ease-in-out infinite;
  margin-bottom: 0.75rem;
}

.skeleton-line:nth-child(1) { width: 40%; height: 10px; }
.skeleton-line:nth-child(2) { width: 85%; height: 16px; }
.skeleton-line:nth-child(3) { width: 70%; height: 16px; margin-bottom: 1.25rem; }
.skeleton-line:nth-child(4) { width: 100%; }
.skeleton-line:nth-child(5) { width: 90%; }
.skeleton-line:nth-child(6) { width: 60%; }

@keyframes shimmer {
  0% { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}

/* --- CTA Section --- */
.section-cta {
  text-align: center;
}

.cta-block {
  max-width: 600px;
  margin: 0 auto;
}

.cta-title {
  font-family: var(--font-heading);
  font-size: clamp(2.5rem, 6vw, 4rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  margin-bottom: 1rem;
  line-height: 1.1;
}

.cta-text {
  font-size: 1.0625rem;
  line-height: 1.7;
  color: var(--text-secondary);
  margin-bottom: 2.5rem;
}

/* --- Footer --- */
.footer {
  padding: 2rem 0;
  border-top: 1px solid var(--border);
}

.footer-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.footer-logo {
  font-family: var(--font-heading);
  font-weight: 700;
  color: var(--text-muted);
  margin-right: 1.5rem;
}

.footer-left {
  display: flex;
  align-items: center;
}

.footer-copy {
  font-size: 0.8125rem;
  color: var(--text-muted);
}

.footer-social {
  color: var(--text-muted);
  transition: color 0.3s;
  padding: 0.5rem;
}
.footer-social:hover { color: var(--accent-light); }

/* --- Reveal Animations --- */
.reveal-up {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
  transition-delay: var(--delay, 0s);
}

.reveal-up.visible {
  opacity: 1;
  transform: translateY(0);
}

/* --- Responsive --- */
@media (max-width: 1024px) {
  .expertise-grid { grid-template-columns: repeat(2, 1fr); }
}

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

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

  .about-image { max-width: 280px; margin: 0 auto; }

  .about-stats {
    justify-content: center;
    gap: 2rem;
  }
  .stat { text-align: center; }

  .expertise-grid { grid-template-columns: 1fr; }
  .posts-grid { grid-template-columns: 1fr; }

  .hero-title {
    font-size: clamp(2.5rem, 10vw, 4rem);
  }

  .footer-content {
    flex-direction: column;
    gap: 1rem;
    text-align: center;
  }
  .footer-left { flex-direction: column; gap: 0.5rem; }
}

@media (max-width: 480px) {
  .about-stats {
    flex-direction: column;
    gap: 1.5rem;
  }
  .hero-actions {
    flex-direction: column;
    align-items: center;
  }
  .btn { width: 100%; justify-content: center; }
}

/* --- Reduced motion --- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  .reveal-up { opacity: 1; transform: none; }
  .marquee-track { animation: none; }
  html { scroll-behavior: auto; }
}