/* ── Variables ─────────────────────────────────────────── */
:root {
  --color-bg: #0f1117;
  --color-surface: #1a1d27;
  --color-surface-2: #222636;
  --color-accent: #4f8ef7;
  --color-accent-hover: #3a7de0;
  --color-text: #e2e8f0;
  --color-text-muted: #8892a4;
  --color-border: #2d3348;
  --radius: 10px;
  --shadow: 0 4px 24px rgba(0,0,0,0.4);
  --font: 'Segoe UI', system-ui, sans-serif;
  --max-width: 1100px;
}

/* ── Reset ─────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body { background: var(--color-bg); color: var(--color-text); font-family: var(--font); line-height: 1.6; }
a { color: var(--color-accent); text-decoration: none; }
a:hover { color: var(--color-accent-hover); }
img { max-width: 100%; display: block; }

/* ── Utilitaires ───────────────────────────────────────── */
.container { max-width: var(--max-width); margin: 0 auto; padding: 0 1.5rem; }
.loading { color: var(--color-text-muted); font-style: italic; }

/* ── Boutons ───────────────────────────────────────────── */
.btn {
  display: inline-block;
  padding: .6rem 1.4rem;
  border-radius: var(--radius);
  font-size: .95rem;
  font-weight: 600;
  transition: background .2s, color .2s, border-color .2s;
  cursor: pointer;
}
.btn--primary { background: var(--color-accent); color: #fff; }
.btn--primary:hover { background: var(--color-accent-hover); color: #fff; }
.btn--outline { border: 2px solid var(--color-border); color: var(--color-text); }
.btn--outline:hover { border-color: var(--color-accent); color: var(--color-accent); }

/* ── Header / Nav ──────────────────────────────────────── */
.header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(15,17,23,.9);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
}
.nav { display: flex; align-items: center; justify-content: space-between; height: 60px; }
.nav__logo { font-weight: 700; font-size: 1.1rem; color: var(--color-text); }
.nav__links { list-style: none; display: flex; gap: 1.5rem; }
.nav__links a { color: var(--color-text-muted); font-size: .9rem; transition: color .2s; }
.nav__links a:hover { color: var(--color-accent); }

/* ── Hero ──────────────────────────────────────────────── */
.hero { padding: 6rem 0 4rem; }
.hero__content { max-width: 700px; }
.hero__tag { color: var(--color-accent); font-size: .85rem; letter-spacing: .08em; text-transform: uppercase; margin-bottom: .75rem; }
.hero__title { font-size: clamp(2.5rem, 6vw, 4rem); font-weight: 800; line-height: 1.1; margin-bottom: 1rem; }
.hero__sub { color: var(--color-text-muted); font-size: 1.1rem; margin-bottom: 2rem; }
.hero__actions { display: flex; gap: 1rem; flex-wrap: wrap; margin-bottom: 3rem; }

.hero__stats { display: flex; gap: 2.5rem; }
.stat { display: flex; flex-direction: column; }
.stat__value { font-size: 2rem; font-weight: 800; color: var(--color-accent); line-height: 1; }
.stat__label { font-size: .8rem; color: var(--color-text-muted); margin-top: .2rem; }

/* ── Sections ──────────────────────────────────────────── */
.section { padding: 5rem 0; }
.section--alt { background: var(--color-surface); }
.section__title { font-size: 1.8rem; font-weight: 700; margin-bottom: 2rem; }

/* ── Filter bar ────────────────────────────────────────── */
.filter-bar { display: flex; gap: .75rem; flex-wrap: wrap; margin-bottom: 2rem; }
.filter-btn {
  padding: .4rem 1rem;
  border-radius: 999px;
  border: 1.5px solid var(--color-border);
  background: transparent;
  color: var(--color-text-muted);
  cursor: pointer;
  font-size: .875rem;
  transition: all .2s;
}
.filter-btn:hover, .filter-btn.active {
  border-color: var(--color-accent);
  color: var(--color-accent);
  background: rgba(79,142,247,.1);
}

/* ── Projects grid ─────────────────────────────────────── */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.5rem;
}
.project-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  transition: border-color .2s, transform .2s;
}
.project-card:hover { border-color: var(--color-accent); transform: translateY(-3px); }
.project-card__header { display: flex; justify-content: space-between; align-items: flex-start; margin-bottom: .75rem; }
.project-card__year { font-size: .8rem; color: var(--color-text-muted); }
.project-card__title { font-size: 1.1rem; font-weight: 700; margin-bottom: .5rem; }
.project-card__desc { color: var(--color-text-muted); font-size: .9rem; flex: 1; margin-bottom: 1rem; }
.project-card__tech { display: flex; flex-wrap: wrap; gap: .4rem; margin-bottom: 1rem; }
.tech-badge {
  font-size: .75rem;
  padding: .2rem .6rem;
  border-radius: 4px;
  background: var(--color-surface-2);
  color: var(--color-text-muted);
  border: 1px solid var(--color-border);
}
.project-card__links { display: flex; gap: .75rem; }
.project-link { font-size: .85rem; font-weight: 600; }
.project-link--demo { color: var(--color-accent); }
.project-link--github { color: var(--color-text-muted); }
.project-link--github:hover { color: var(--color-text); }

/* ── Skills ────────────────────────────────────────────── */
.skills-container { display: flex; flex-direction: column; gap: 2rem; }
.skill-group__title {
  font-size: .75rem;
  text-transform: uppercase;
  letter-spacing: .1em;
  color: var(--color-accent);
  margin-bottom: .75rem;
}
.skill-group__badges { display: flex; flex-wrap: wrap; gap: .5rem; }
.skill-badge {
  padding: .35rem .85rem;
  border-radius: 6px;
  font-size: .85rem;
  border: 1px solid var(--color-border);
  background: var(--color-surface-2);
}
.skill-badge--expert { border-color: var(--color-accent); color: var(--color-accent); }
.skill-badge--avancé { border-color: #4ade80; color: #4ade80; }
.skill-badge--intermédiaire { border-color: var(--color-border); color: var(--color-text-muted); }

/* ── About ─────────────────────────────────────────────── */
.about { display: grid; grid-template-columns: 1fr 1fr; gap: 4rem; align-items: start; }
.about p { color: var(--color-text-muted); margin-bottom: 1rem; }
.about p strong { color: var(--color-text); }
.about__links { display: flex; gap: .75rem; flex-wrap: wrap; margin-top: 1.5rem; }

.timeline-item { display: flex; gap: 1rem; margin-bottom: 1.25rem; padding-bottom: 1.25rem; border-bottom: 1px solid var(--color-border); }
.timeline-item:last-child { border-bottom: none; }
.timeline-year { font-size: .8rem; color: var(--color-accent); font-weight: 700; white-space: nowrap; min-width: 90px; padding-top: .1rem; }
.timeline-role { font-size: .9rem; color: var(--color-text-muted); }

/* ── Footer ────────────────────────────────────────────── */
.footer {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding: 2rem 0;
  text-align: center;
  color: var(--color-text-muted);
  font-size: .875rem;
}
.footer p + p { margin-top: .5rem; }
.footer a { color: var(--color-text-muted); }
.footer a:hover { color: var(--color-accent); }

/* ── Responsive ────────────────────────────────────────── */
@media (max-width: 768px) {
  .about { grid-template-columns: 1fr; gap: 2rem; }
  .hero__stats { gap: 1.5rem; }
  .nav__links { gap: 1rem; }
}
@media (max-width: 480px) {
  .nav__links { display: none; }
  .hero__title { font-size: 2rem; }
}