:root {
  --bg: #ffffff;
  --text: #121926;
  --muted: #5a6e8c;
  --line: #e8eef6;
  --surface: rgba(255, 255, 255, 0.85);
  --surface-border: rgba(255, 255, 255, 0.92);
  --primary: #0f1f3e;
  --accent: #2f6bff;
  --nav-bg: rgba(255, 255, 255, 0.85);
  --input-bg: #ffffff;
  --hover-shadow: 0 16px 34px rgba(15, 25, 40, 0.12);
}

body[data-theme='dark'] {
  --bg: #0e1525;
  --text: #e5ecf8;
  --muted: #9aaccc;
  --line: #1f2b43;
  --surface: rgba(18, 29, 48, 0.78);
  --surface-border: rgba(154, 172, 204, 0.2);
  --primary: #e5ecf8;
  --accent: #7dacff;
  --nav-bg: rgba(11, 20, 36, 0.85);
  --input-bg: #0e1728;
  --hover-shadow: 0 14px 28px rgba(6, 10, 20, 0.55);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: 'Inter', sans-serif;
  color: var(--text);
  line-height: 1.6;
  background: radial-gradient(circle at 10% 5%, rgba(84, 139, 255, 0.14), transparent 30%), var(--bg);
}

a { color: inherit; text-decoration: none; }
.container { width: min(1120px, 92%); margin: 0 auto; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background: var(--nav-bg);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}

.navbar {
  min-height: 70px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.logo { font-weight: 800; letter-spacing: 0.04em; }

.nav-links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 0.7rem;
}

.nav-links a {
  color: var(--muted);
  font-size: 0.88rem;
  padding: 0.4rem 0.66rem;
  border-radius: 999px;
  transition: 0.2s ease;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--text);
  background: color-mix(in srgb, var(--accent) 12%, transparent);
}

.nav-toggle { display: none; background: transparent; border: 0; }
.nav-toggle span { display: block; width: 22px; height: 2px; margin: 5px 0; background: var(--text); }

.theme-toggle {
  border: 1px solid var(--line);
  background: var(--input-bg);
  color: var(--text);
  border-radius: 999px;
  width: 40px;
  height: 40px;
  cursor: pointer;
}

.section { padding: 4.6rem 0; border-top: 1px solid var(--line); }
.section-id { margin: 0 0 0.5rem; font-size: 0.78rem; letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted); }
h1, h2, h3 { line-height: 1.2; margin: 0 0 0.8rem; }
h1 { font-size: clamp(2rem, 4.8vw, 3.4rem); }
h2 { font-size: clamp(1.45rem, 3vw, 2.15rem); }
h3 { font-size: 1.04rem; }

.hero { padding: 5.2rem 0 4.2rem; }
.hero-kicker { color: var(--muted); text-transform: uppercase; letter-spacing: 0.08em; font-size: 0.8rem; }
.hero-text { max-width: 760px; color: var(--muted); }
.hero-actions { display: flex; gap: 0.8rem; margin-top: 1.2rem; flex-wrap: wrap; }

.word-slider { display: inline-flex; min-width: 200px; color: var(--accent); font-weight: 800; }
#animated-word {
  display: inline-block;
  border-right: 2px solid var(--accent);
  padding-right: 0.32rem;
  animation: caret 0.8s steps(1) infinite;
}

@keyframes caret { 50% { border-color: transparent; } }

.btn {
  border-radius: 999px;
  padding: 0.74rem 1.08rem;
  border: 1px solid transparent;
  font-weight: 600;
  transition: transform 0.2s ease, box-shadow 0.25s ease;
}
.btn:hover { transform: translateY(-2px); }
.btn-primary { background: var(--primary); color: var(--bg); box-shadow: 0 10px 24px rgba(17, 24, 39, 0.2); }
.btn-ghost { border-color: var(--line); background: var(--input-bg); color: var(--text); }

.block {
  background: var(--surface);
  border: 1px solid var(--surface-border);
  backdrop-filter: blur(10px);
  border-radius: 18px;
  padding: 1.15rem;
  box-shadow: 0 8px 22px rgba(28, 44, 72, 0.08);
}

.hover-lift,
.sae-card {
  transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
}

.hover-lift:hover,
.sae-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--hover-shadow);
  border-color: color-mix(in srgb, var(--accent) 40%, var(--surface-border));
}

.split,
.skills-grid { display: grid; grid-template-columns: 1.5fr 1fr; gap: 1rem; }
.about-inner { gap: 1.4rem; align-items: start; }

.glass-card {
  background: rgba(255, 255, 255, 0.68);
  border: 1px solid rgba(255, 255, 255, 0.58);
  backdrop-filter: blur(10px);
  box-shadow: 0 14px 30px rgba(15, 28, 55, 0.10);
  border-radius: 18px;
  padding: 1.3rem;
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
}

.about-lead {
  margin: 0;
  font-size: 1.05rem;
  font-weight: 700;
  line-height: 1.5;
}

.about-subtitle,
.about-conclusion {
  margin: 0;
  color: var(--muted);
  line-height: 1.6;
}

.profile-cards {
  display: grid;
  gap: 0.95rem;
}

.card {
  background: rgba(249, 252, 255, 0.72);
  border: 1px solid rgba(165, 194, 255, 0.45);
  border-radius: 15px;
  padding: 1rem;
  min-height: 100px;
}

.card h3 {
  margin: 0 0 0.4rem;
  color: var(--accent);
  font-size: 1rem;
}

.card p {
  margin: 0;
  color: var(--text);
}

.skills-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.6rem;
}

.skills-badges span {
  font-size: 0.80rem;
  border-radius: 999px;
  padding: 0.38rem 0.64rem;
  background: rgba(47, 107, 255, 0.14);
  border: 1px solid rgba(47, 107, 255, 0.32);
  color: var(--accent);
}

.hover-lift:hover,
.card:hover,
.glass-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 18px 36px rgba(15, 28, 55, 0.15);
}

.cards { display: grid; gap: 1rem; grid-template-columns: repeat(3, 1fr); }
.cards.two { grid-template-columns: repeat(2, 1fr); }
.exp-grid { grid-template-columns: repeat(2, 1fr); }

.stats { display: grid; gap: 0.8rem; }
.stats strong { display: block; }

.academic-timeline {
  display: grid;
  gap: 0.85rem;
  border-left: 2px solid color-mix(in srgb, var(--accent) 35%, var(--line));
  padding-left: 1rem;
}

.timeline-item { position: relative; }
.timeline-item h3 {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.timeline-date {
  font-weight: 500;
  color: var(--muted);
  font-size: 0.9rem;
}
.title {
  flex: 1;
}
.timeline-item::before {
  content: '';
  position: absolute;
  left: -1.45rem;
  top: 1rem;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: color-mix(in srgb, var(--accent) 60%, white);
}

.current-step {
  background: color-mix(in srgb, var(--accent) 20%, var(--surface));
  border-color: color-mix(in srgb, var(--accent) 60%, var(--surface-border));
}

.path-note { color: var(--muted); margin-top: 0.9rem; }

.skills-summary .badges { margin-top: 0.6rem; }
.badges { display: flex; flex-wrap: wrap; gap: 0.5rem; }
.badges span {
  background: color-mix(in srgb, var(--accent) 12%, transparent);
  border: 1px solid color-mix(in srgb, var(--accent) 36%, transparent);
  border-radius: 999px;
  padding: 0.33rem 0.68rem;
  font-size: 0.84rem;
}

.date { color: var(--accent); margin: 0 0 0.45rem; font-weight: 600; font-size: 0.9rem; }
.list-clean { margin: 0.4rem 0 0; padding-left: 1rem; }
.list-clean li { margin-bottom: 0.35rem; }

.sae-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; }
.sae-card {
  background: var(--surface);
  border: 1px solid var(--surface-border);
  border-radius: 16px;
  padding: 0.4rem 0.7rem 0.8rem;
}

.sae-trigger {
  width: 100%;
  border: 0;
  background: transparent;
  color: inherit;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: start;
  gap: 0.65rem;
  text-align: left;
  padding: 0.3rem 0;
  cursor: pointer;
}

.sae-icon {
  width: 34px;
  height: 34px;
  border-radius: 10px;
  display: grid;
  place-items: center;
  background: color-mix(in srgb, var(--accent) 18%, transparent);
  border: 1px solid color-mix(in srgb, var(--accent) 30%, transparent);
  font-size: 0.95rem;
}

.sae-headline { display: grid; gap: 0.2rem; }
.sae-title { font-weight: 700; line-height: 1.3; }
.sae-subtitle { color: var(--muted); font-size: 0.86rem; line-height: 1.35; }

.sae-chevron {
  font-size: 1.15rem;
  color: var(--muted);
  transform-origin: center;
  transition: transform 0.24s ease;
}

.sae-trigger[aria-expanded='true'] .sae-chevron { transform: rotate(180deg); }

.sae-trigger:focus-visible {
  outline: 2px solid color-mix(in srgb, var(--accent) 45%, transparent);
  outline-offset: 4px;
  border-radius: 10px;
}

.sae-panel {
  overflow: hidden;
  max-height: 0;
  opacity: 0;
  border-top: 1px solid transparent;
  transition: max-height 0.35s ease, opacity 0.25s ease, border-color 0.25s ease, margin-top 0.25s ease;
  margin-top: 0;
}

.sae-panel.is-open {
  opacity: 1;
  margin-top: 0.65rem;
  border-color: var(--line);
}

.sae-panel p { margin: 0.45rem 0; }

.skill { margin-bottom: 0.72rem; }
.skill p { margin: 0 0 0.24rem; }
.skill div { width: 100%; height: 10px; background: color-mix(in srgb, var(--text) 12%, transparent); border-radius: 999px; overflow: hidden; }
.skill span { display: block; width: var(--w); height: 100%; background: linear-gradient(90deg, #2f6bff, #8db5ff); }

.certs { margin-top: 1rem; }

/* Chronologie améliorée */
.timeline-section {
  margin-bottom: 2.2rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--line);
}

.timeline-section:last-child {
  border-bottom: none;
  margin-bottom: 1rem;
}

.timeline-heading {
  color: color-mix(in srgb, var(--text) 80%, var(--accent));
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  margin-bottom: 1.2rem;
  text-transform: uppercase;
  opacity: 0.9;
}

.master-intro {
  margin-bottom: 1.2rem;
  background: color-mix(in srgb, var(--accent) 8%, var(--surface));
  border-color: color-mix(in srgb, var(--accent) 40%, var(--surface-border));
}

.master-intro p:first-child {
  font-size: 0.98rem;
  font-weight: 700;
  margin: 0 0 0.5rem;
}

.master-description {
  color: var(--muted);
  font-size: 0.92rem;
  margin: 0;
}

.master-timeline .timeline-item {
  background: color-mix(in srgb, var(--accent) 6%, var(--surface));
}

.master-timeline .timeline-item h3 {
  color: color-mix(in srgb, var(--accent) 100%, var(--text));
}

.timeline-location {
  color: var(--muted);
  font-size: 0.88rem;
  margin: 0.5rem 0 0;
}

/*  Visualization */
.cv-highlight { display: grid; gap: 0.8rem; }

.cv-container {
  display: grid;
  grid-template-columns: 2.5fr 1fr;
  gap: 1.5rem;
  margin-top: 1.5rem;
}

.cv-viewer {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  background: var(--input-bg);
  border-radius: 16px;
  border: 1px solid var(--line);
  overflow: hidden;
}

.cv-placeholder-text {
  padding: 1rem;
  color: var(--muted);
  font-size: 0.92rem;
  text-align: center;
  margin: 0;
  background: color-mix(in srgb, var(--accent) 4%, transparent);
  border-bottom: 1px solid var(--line);
}

.cv-actions {
  display: flex;
  gap: 0.75rem;
  margin-bottom: 0.9rem;
  flex-wrap: wrap;
}

.cv-embed {
  flex: 1;
  min-height: 720px;
  background: var(--bg);
  color: var(--muted);
  display: grid;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 14px;
  overflow: hidden;
}

.cv-embed iframe {
  width: 100%;
  height: 100%;
  border: none;
}

.cv-note-viewer {
  padding: 0.8rem 1rem;
  background: color-mix(in srgb, var(--accent) 8%, var(--surface));
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.84rem;
  margin: 0;
  text-align: center;
}

.cv-download {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.cv-download .block {
  height: 100%;
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
}

.cv-download h3 {
  margin: 0 0 0.5rem;
  font-size: 1.02rem;
}

.cv-download p {
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
  flex: 1;
}

.cv-download .btn {
  width: 100%;
  text-align: center;
  margin-top: auto;
}

.lm{
  margin-top: 20px;
  margin-bottom: 2px;
}
.cv-note { color: var(--muted); margin: 0; font-size: 0.88rem; }

.contact-form { display: grid; gap: 0.7rem; }
.contact-form label { display: grid; gap: 0.35rem; font-size: 0.92rem; }
input, textarea {
  border-radius: 12px;
  border: 1px solid var(--line);
  padding: 0.7rem;
  background: var(--input-bg);
  color: var(--text);
  font: inherit;
}
input:focus, textarea:focus { outline: 2px solid color-mix(in srgb, var(--accent) 35%, transparent); border-color: var(--accent); }

.to-top {
  position: fixed;
  right: 1.2rem;
  bottom: 1.2rem;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  border: 0;
  background: var(--primary);
  color: var(--bg);
  opacity: 0;
  visibility: hidden;
  transition: 0.25s ease;
  cursor: pointer;
}
.to-top.show { opacity: 1; visibility: visible; }

.site-footer { padding: 2rem 0; border-top: 1px solid var(--line); color: var(--muted); text-align: center; }

.reveal { opacity: 0; transform: translateY(24px); transition: opacity 0.7s ease, transform 0.7s ease; }
.reveal.visible { opacity: 1; transform: translateY(0); }

@media (max-width: 1000px) {
  .split,
  .about-inner,
  .skills-grid,
  .exp-grid,
  .sae-grid,
  .cards { grid-template-columns: 1fr; }

  .profile-cards { grid-template-columns: 1fr; }
  .cv-container { grid-template-columns: 1fr; }

  .nav-toggle { display: block; }
  .nav-links {
    position: absolute;
    top: 70px;
    right: 4%;
    width: min(340px, 92%);
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: 16px;
    display: grid;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.25s ease;
    box-shadow: 0 10px 24px rgba(19, 30, 52, 0.14);
  }
  .nav-links.open { max-height: 520px; padding: 0.5rem; }
  .nav-links a { display: block; }
}

@media (max-width: 700px) {
  .section { padding: 4rem 0; }
  .hero-actions { flex-direction: column; }
  .btn { width: 100%; text-align: center; }
}