*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --accent: #1a9fd4;        /* bleu vif OFPPT */
  --accent2: #2db89e;       /* teal/vert du logo */
  --accent3: #0056a3;       /* bleu foncé */
  --dark: #03111f;          /* fond très sombre bleuté */
  --text: #e8f4fc;          /* blanc bleuté */
  --muted: rgba(180, 220, 245, 0.55);
  --transition: 0.9s cubic-bezier(0.77, 0, 0.175, 1);
}

html, body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: var(--dark);
  font-family: 'Inter', sans-serif;
  color: var(--text);
}

/* ── Global blue glow ambiance ── */
.slider-wrapper::before {
  content: '';
  position: fixed;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 15% 50%, rgba(26, 159, 212, 0.12) 0%, transparent 70%),
    radial-gradient(ellipse 60% 80% at 85% 30%, rgba(0, 86, 163, 0.15) 0%, transparent 70%);
  pointer-events: none;
  z-index: 1;
}

/* ── Wrapper ── */
.slider-wrapper {
  position: relative;
  width: 100vw;
  height: 100vh;
  overflow: hidden;
}

/* ── Slides ── */
.slides-container {
  position: relative;
  width: 100%;
  height: 100%;
}

.slide {
  position: absolute;
  inset: 0;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition);
}

.slide.active {
  opacity: 1;
  pointer-events: all;
}

.slide-bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  transform: scale(1.08);
  transition: transform 7s ease;
  filter: grayscale(20%) brightness(0.75);
}

.slide.active .slide-bg {
  transform: scale(1);
}

.slide-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    110deg,
    rgba(3, 17, 31, 0.93) 0%,
    rgba(0, 56, 110, 0.55) 55%,
    rgba(26, 159, 212, 0.12) 100%
  );
}

/* ── Slide Content ── */
.slide-content {
  position: absolute;
  bottom: 13vh;
  left: 8vw;
  max-width: 580px;
}

.slide-year {
  font-family: 'Playfair Display', serif;
  font-size: clamp(0.75rem, 1.2vw, 0.9rem);
  font-weight: 700;
  letter-spacing: 0.3em;
  color: var(--accent);
  margin-bottom: 0.4rem;
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.slide-sub {
  font-size: clamp(0.65rem, 1vw, 0.78rem);
  font-weight: 500;
  letter-spacing: 0.35em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 1rem;
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.slide-title {
  font-family: 'Playfair Display', serif;
  font-size: clamp(3.2rem, 7.5vw, 6.5rem);
  font-weight: 900;
  line-height: 0.95;
  letter-spacing: -0.02em;
  color: var(--text);
  margin-bottom: 1.5rem;
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.slide-title em {
  font-style: italic;
  color: var(--accent);
}

.slide-desc {
  font-size: clamp(0.78rem, 1.2vw, 0.92rem);
  font-weight: 300;
  line-height: 1.85;
  color: var(--muted);
  margin-bottom: 2.2rem;
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.slide-cta {
  display: inline-block;
  padding: 0.8rem 2rem;
  border: 1px solid var(--accent);
  color: var(--accent);
  text-decoration: none;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  position: relative;
  overflow: hidden;
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease, color 0.3s ease;
  background: rgba(26, 159, 212, 0.08);
}

.slide-cta::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, var(--accent3), var(--accent));
  transform: translateX(-101%);
  transition: transform 0.4s cubic-bezier(0.77, 0, 0.175, 1);
  z-index: -1;
}

.slide-cta:hover {
  color: var(--dark);
}

.slide-cta:hover::before {
  transform: translateX(0);
}

/* ── Slide Tag (top right) ── */
.slide-tag {
  position: absolute;
  top: 50%;
  right: 8vw;
  transform: translateY(-50%) rotate(90deg);
  font-size: 0.65rem;
  letter-spacing: 0.4em;
  text-transform: uppercase;
  color: var(--accent);
  white-space: nowrap;
  opacity: 0;
  transition: opacity 0.8s ease 1s;
  border-left: 2px solid var(--accent);
  padding-left: 1rem;
}

.slide.active .slide-tag {
  opacity: 1;
}

/* ── Animate in ── */
.slide.active .animate-up {
  opacity: 1;
  transform: translateY(0);
}

.slide.active .delay-1 { transition-delay: 0.2s; }
.slide.active .delay-2 { transition-delay: 0.45s; }
.slide.active .delay-3 { transition-delay: 0.65s; }
.slide.active .delay-4 { transition-delay: 0.85s; }

/* ── Header ── */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.8rem 8vw;
  background: linear-gradient(to bottom, rgba(3,17,31,0.9) 0%, transparent 100%);
  border-bottom: 1px solid rgba(26, 159, 212, 0.1);
}

.logo-block {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.logo-main {
  font-family: 'Playfair Display', serif;
  font-size: clamp(1rem, 1.8vw, 1.3rem);
  font-weight: 900;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text);
  line-height: 1;
}

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

.logo-sub {
  font-size: 0.6rem;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--muted);
}

.header-right {
  display: flex;
  align-items: center;
  gap: 2rem;
}

/* ── ofppt badge style ── */
.ofppt-logo {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.15rem;
}

.ofppt-wordmark {
  font-size: 0.6rem;
  font-weight: 700;
  letter-spacing: 0.35em;
  text-transform: uppercase;
  color: var(--text);
  opacity: 0.85;
}

.social-links {
  display: flex;
  gap: 1.2rem;
  align-items: center;
}

.social-links a {
  color: var(--muted);
  transition: color 0.3s ease;
  display: flex;
  align-items: center;
}

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

/* ── Bottom UI ── */
.slider-ui {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.8rem 8vw;
  background: linear-gradient(to top, rgba(3,17,31,0.85) 0%, transparent 100%);
  border-top: 1px solid rgba(26, 159, 212, 0.1);
}

.slide-counter {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.current-num {
  font-family: 'Playfair Display', serif;
  font-size: 2rem;
  font-weight: 700;
  color: var(--accent);
  line-height: 1;
  min-width: 2ch;
  transition: opacity 0.3s ease;
}

.separator {
  width: 40px;
  height: 1px;
  background: var(--muted);
}

.total-num {
  font-size: 0.75rem;
  color: var(--muted);
  letter-spacing: 0.1em;
}

/* ── Progress Bar ── */
.progress-bar {
  flex: 1;
  max-width: 280px;
  height: 1px;
  background: rgba(26, 159, 212, 0.15);
  margin: 0 3vw;
  position: relative;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent3), var(--accent), var(--accent2));
  width: 0%;
  transition: width 0.1s linear;
}

/* ── Nav Arrows ── */
.nav-arrows {
  display: flex;
  gap: 0.8rem;
}

.arrow-btn {
  width: 46px;
  height: 46px;
  border: 1px solid rgba(26, 159, 212, 0.35);
  background: rgba(26, 159, 212, 0.07);
  color: var(--text);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: border-color 0.3s ease, background 0.3s ease, color 0.3s ease;
}

.arrow-btn:hover {
  border-color: var(--accent);
  background: var(--accent);
  color: var(--dark);
}

.arrow-btn .material-icons {
  font-size: 1.1rem;
}

/* ── Vertical Label ── */
.vertical-label {
  position: fixed;
  right: 2rem;
  top: 50%;
  transform: translateY(-50%) rotate(90deg);
  transform-origin: center center;
  font-size: 0.58rem;
  letter-spacing: 0.35em;
  text-transform: uppercase;
  color: var(--muted);
  white-space: nowrap;
  z-index: 100;
}

/* ── Timeline Dots ── */
.timeline-dots {
  position: fixed;
  left: 2.5rem;
  top: 50%;
  transform: translateY(-50%);
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
  z-index: 100;
}

.dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: rgba(26, 159, 212, 0.3);
  cursor: pointer;
  transition: background 0.3s ease, transform 0.3s ease;
  position: relative;
}

.dot.active {
  background: var(--accent);
  transform: scale(1.5);
  box-shadow: 0 0 8px rgba(26, 159, 212, 0.6);
}

.dot::after {
  content: attr(data-year);
  position: absolute;
  left: 16px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 0.55rem;
  letter-spacing: 0.15em;
  color: var(--muted);
  white-space: nowrap;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.dot:hover::after,
.dot.active::after {
  opacity: 1;
}

/* ── Slide number watermark ── */
.slide::before {
  content: '20' attr(data-index);
  position: absolute;
  right: 6vw;
  bottom: 12vh;
  font-family: 'Playfair Display', serif;
  font-size: clamp(6rem, 14vw, 12rem);
  font-weight: 900;
  color: rgba(26, 159, 212, 0.06);
  line-height: 1;
  pointer-events: none;
  user-select: none;
}

/* ── Blue wave bottom decoration ── */
.slider-wrapper::after {
  content: '';
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg,
    var(--accent3) 0%,
    var(--accent) 40%,
    var(--accent2) 70%,
    var(--accent3) 100%
  );
  z-index: 200;
}

/* ── Responsive ── */
@media (max-width: 768px) {
  .slide-content {
    bottom: 16vh;
    left: 6vw;
    right: 6vw;
    max-width: 100%;
  }

  .vertical-label,
  .timeline-dots {
    display: none;
  }

  .progress-bar {
    max-width: 100px;
  }

  .site-header,
  .slider-ui {
    padding: 1.4rem 6vw;
  }

  .slide-tag {
    display: none;
  }
}

@media (max-width: 480px) {
  .slide-title {
    font-size: clamp(2.5rem, 11vw, 3.5rem);
  }

  .progress-bar {
    display: none;
  }

  .ofppt-logo {
    display: none;
  }
}