/* ==========================================================================
   PORTFOLIO - SYSTÈME DE DESIGN « OBSIDIENNE »
   Fond très sombre, formes rondes, accent violet, transitions lentes.
   La DA suit le logo : un monogramme circulaire tracé à la main.
   Partagé par toutes les pages : accueil, projets, login, admin.
   ========================================================================== */

:root {
  /* fonds */
  --bg: #0a0a0c;
  --bg-soft: #0e0e12;
  --surface: #141419;
  --surface-2: #1b1b22;

  /* filets */
  --line: rgba(255, 255, 255, .13);
  --line-soft: rgba(255, 255, 255, .085);
  --line-strong: rgba(255, 255, 255, .2);

  /* texte */
  --text: #eceaf0;
  --muted: #c4c1cf;
  --faint: #a19eaf;

  /* accent - violet doux (seconde couleur de la charte) */
  --violet: #9d8df0;
  --violet-deep: #6d5bd0;
  --violet-soft: rgba(157, 141, 240, .12);
  --violet-line: rgba(157, 141, 240, .4);
  --violet-glow: rgba(109, 91, 208, .18);

  /* accent chaud, en appoint */
  --sand: #c9bfaf;

  /* états */
  --danger: #e0908a;
  --ok: #9fc4a8;

  /* typo */
  --serif: 'Instrument Serif', Georgia, 'Times New Roman', serif;
  --sans: 'Inter', -apple-system, 'Helvetica Neue', Arial, sans-serif;

  /* rondeurs */
  --r-sm: 12px;
  --r-md: 18px;
  --r-lg: 26px;
  --r-xl: 34px;
  --r-pill: 999px;

  /* rythme & mouvement */
  --ease: cubic-bezier(.22, .61, .36, 1);
  --ease-soft: cubic-bezier(.33, 1, .68, 1);
  --gutter: clamp(1.25rem, 5vw, 5.5rem);
  --maxw: 1280px;
  --nav-h: 68px;
}

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

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  font-family: var(--sans);
  font-weight: 300;
  font-size: 16px;
  line-height: 1.65;
  background: var(--bg);
  color: var(--text);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

body.no-scroll { overflow: hidden; }

/* grain très léger - donne de la matière au noir */
body::after {
  content: '';
  position: fixed;
  inset: 0;
  z-index: 900;
  pointer-events: none;
  opacity: .26;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 240 240' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.05'/%3E%3C/svg%3E");
}

::selection { background: var(--violet); color: #0a0a0c; }

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

:focus-visible {
  outline: 2px solid var(--violet);
  outline-offset: 3px;
  border-radius: var(--r-sm);
}

::-webkit-scrollbar { width: 9px; height: 9px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: #2a2733; border: 3px solid var(--bg); border-radius: var(--r-pill); }
::-webkit-scrollbar-thumb:hover { background: var(--violet-deep); }

/* LOGO */

/* le scan du monogramme est noir sur blanc :
   on l'inverse et on écrase le fond noir en mode « screen ». */
.logo-mark {
  width: 38px;
  height: 38px;
  flex-shrink: 0;
  border-radius: 50%;
  overflow: hidden;
  display: grid;
  place-items: center;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, .02);
  transition: border-color .6s var(--ease-soft), transform .6s var(--ease-soft), box-shadow .6s var(--ease-soft);
}

.logo-mark img {
  width: 132%;
  height: 132%;
  object-fit: contain;
  opacity: .92;
}

a:hover > .logo-mark,
.logo-mark:hover {
  border-color: var(--violet-line);
  transform: rotate(-8deg) scale(1.05);
  box-shadow: 0 0 28px var(--violet-glow);
}

/* TYPOGRAPHIE */

.display {
  font-family: var(--serif);
  font-weight: 400;
  line-height: 1;
  letter-spacing: -.02em;
}

.display em {
  font-style: italic;
  background: linear-gradient(105deg, var(--violet) 10%, var(--sand) 95%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.eyebrow {
  font-size: .68rem;
  font-weight: 500;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--faint);
  display: flex;
  align-items: center;
  gap: .9rem;
}

.eyebrow::before {
  content: '';
  width: 26px;
  height: 1px;
  border-radius: var(--r-pill);
  background: linear-gradient(90deg, transparent, var(--violet));
  flex-shrink: 0;
}

.num {
  font-size: .68rem;
  letter-spacing: .12em;
  color: var(--faint);
  font-variant-numeric: tabular-nums;
}

/* NAV - îlot flottant arrondi */

.site-nav {
  position: fixed;
  top: 14px;
  left: var(--gutter);
  right: var(--gutter);
  z-index: 800;
  height: var(--nav-h);
  padding: 0 .75rem 0 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  border-radius: var(--r-pill);
  border: 1px solid var(--line-soft);
  background: rgba(14, 14, 18, .55);
  backdrop-filter: blur(20px) saturate(1.3);
  -webkit-backdrop-filter: blur(20px) saturate(1.3);
  transition: background .6s var(--ease-soft), border-color .6s var(--ease-soft),
              box-shadow .6s var(--ease-soft), top .6s var(--ease-soft);
}

.site-nav.scrolled {
  top: 10px;
  background: rgba(14, 14, 18, .82);
  border-color: var(--line);
  box-shadow: 0 18px 50px rgba(0, 0, 0, .5), 0 0 0 1px rgba(157, 141, 240, .05);
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: .7rem;
  font-family: var(--serif);
  font-size: 1.2rem;
  letter-spacing: .01em;
  color: var(--text);
  transition: color .4s var(--ease-soft);
}

.nav-logo:hover { color: var(--violet); }

.nav-links {
  display: flex;
  gap: .4rem;
  list-style: none;
}

.nav-links a {
  position: relative;
  display: block;
  padding: .55rem 1.1rem;
  border-radius: var(--r-pill);
  font-size: .72rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--muted);
  transition: color .45s var(--ease-soft), background .45s var(--ease-soft);
}

.nav-links a:hover { color: var(--text); background: rgba(255, 255, 255, .04); }

.nav-links a[aria-current="page"] {
  color: var(--text);
  background: var(--violet-soft);
  box-shadow: inset 0 0 0 1px var(--violet-line);
}

.nav-right { display: flex; align-items: center; gap: .6rem; }

.lang-toggle {
  display: flex;
  align-items: center;
  gap: .3rem;
  padding: .5rem .9rem;
  border-radius: var(--r-pill);
  border: 1px solid var(--line-soft);
  font-size: .66rem;
  letter-spacing: .12em;
  color: var(--faint);
  transition: border-color .45s var(--ease-soft), background .45s var(--ease-soft);
}

.lang-toggle span { transition: color .4s var(--ease-soft); }
.lang-toggle .is-active { color: var(--violet); }
.lang-toggle:hover { border-color: var(--violet-line); background: var(--violet-soft); }

.nav-admin {
  padding: .5rem 1.1rem;
  border-radius: var(--r-pill);
  border: 1px solid var(--line-soft);
  font-size: .66rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--faint);
  transition: color .45s var(--ease-soft), border-color .45s var(--ease-soft), background .45s var(--ease-soft);
}

.nav-admin:hover { color: var(--text); border-color: var(--line); background: rgba(255, 255, 255, .04); }

/* BURGER + PANNEAU MOBILE */

.burger {
  display: none;
  position: relative;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 1px solid var(--line-soft);
  transition: border-color .45s var(--ease-soft), background .45s var(--ease-soft);
}

.burger:hover { border-color: var(--violet-line); background: var(--violet-soft); }

.burger span {
  position: absolute;
  left: 50%;
  width: 17px;
  height: 1.5px;
  border-radius: var(--r-pill);
  background: var(--text);
  transform: translateX(-50%);
  transition: transform .5s var(--ease-soft), opacity .3s var(--ease-soft), width .5s var(--ease-soft);
}

.burger span:nth-child(1) { top: 16px; }
.burger span:nth-child(2) { top: 21.5px; width: 12px; }
.burger span:nth-child(3) { top: 27px; }

.burger[aria-expanded="true"] span:nth-child(1) { transform: translateX(-50%) translateY(5.5px) rotate(45deg); }
.burger[aria-expanded="true"] span:nth-child(2) { opacity: 0; width: 0; }
.burger[aria-expanded="true"] span:nth-child(3) { transform: translateX(-50%) translateY(-5.5px) rotate(-45deg); }

.mobile-panel {
  position: fixed;
  inset: 0;
  z-index: 790;
  padding: calc(var(--nav-h) + 3.5rem) var(--gutter) 2.5rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  overflow: hidden;
  background: rgba(10, 10, 12, .92);
  backdrop-filter: blur(26px);
  -webkit-backdrop-filter: blur(26px);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-12px);
  transition: opacity .55s var(--ease-soft), transform .55s var(--ease-soft), visibility .55s;
}

.mobile-panel.open { opacity: 1; visibility: visible; transform: none; }

.mobile-panel::before {
  content: '';
  position: absolute;
  top: -18%;
  right: -14%;
  width: 78vw;
  height: 78vw;
  border-radius: 50%;
  background: radial-gradient(circle, var(--violet-glow) 0%, transparent 65%);
  pointer-events: none;
}

.mobile-links { list-style: none; display: flex; flex-direction: column; gap: .3rem; position: relative; }

.mobile-links a {
  display: flex;
  align-items: baseline;
  gap: 1rem;
  padding: .7rem 0;
  font-family: var(--serif);
  font-size: clamp(2rem, 9vw, 3rem);
  line-height: 1.1;
  color: var(--text);
  opacity: 0;
  transform: translateX(-26px);
  transition: opacity .6s var(--ease-soft), transform .6s var(--ease-soft), color .4s var(--ease-soft);
}

.mobile-panel.open .mobile-links a { opacity: 1; transform: none; }
.mobile-panel.open .mobile-links li:nth-child(1) a { transition-delay: .1s; }
.mobile-panel.open .mobile-links li:nth-child(2) a { transition-delay: .17s; }
.mobile-panel.open .mobile-links li:nth-child(3) a { transition-delay: .24s; }
.mobile-panel.open .mobile-links li:nth-child(4) a { transition-delay: .31s; }

.mobile-links a:hover { color: var(--violet); }
.mobile-links .num { font-size: .6rem; }

.mobile-foot {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding-top: 1.6rem;
  border-top: 1px solid var(--line-soft);
  font-size: .7rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--faint);
  opacity: 0;
  transform: translateY(14px);
  transition: opacity .6s .38s var(--ease-soft), transform .6s .38s var(--ease-soft);
}

.mobile-panel.open .mobile-foot { opacity: 1; transform: none; }

/* BOUTONS */

.btn {
  display: inline-flex;
  align-items: center;
  gap: .7rem;
  padding: .95rem 1.9rem;
  border-radius: var(--r-pill);
  font-size: .72rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--text);
  border: 1px solid var(--line-strong);
  background: transparent;
  transition: background .55s var(--ease-soft), color .55s var(--ease-soft),
              border-color .55s var(--ease-soft), transform .55s var(--ease-soft),
              box-shadow .55s var(--ease-soft);
}

.btn:hover {
  transform: translateY(-2px);
  border-color: transparent;
  color: #0a0a0c;
  background: linear-gradient(120deg, var(--violet) 0%, var(--sand) 130%);
  box-shadow: 0 16px 40px var(--violet-glow);
}

.btn-ghost { border-color: var(--line); color: var(--muted); }

.btn-ghost:hover {
  color: var(--text);
  background: var(--violet-soft);
  border-color: var(--violet-line);
  box-shadow: 0 14px 34px rgba(0, 0, 0, .35);
}

.btn-arrow::after {
  content: '\2192';
  font-size: .9rem;
  letter-spacing: 0;
  transition: transform .55s var(--ease-soft);
}

.btn:hover .btn-arrow::after,
.btn-arrow:hover::after { transform: translateX(5px); }

/* lien texte souligné au survol */
.link-underline { position: relative; color: var(--text); }

.link-underline::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -3px;
  width: 100%;
  height: 1px;
  border-radius: var(--r-pill);
  background: var(--violet);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform .55s var(--ease-soft);
}

.link-underline:hover { color: var(--violet); }
.link-underline:hover::after { transform: scaleX(1); transform-origin: left; }

/* SECTIONS & FILETS */

.section { padding: clamp(4.5rem, 11vw, 9rem) var(--gutter); position: relative; }
.section + .section { border-top: 1px solid var(--line-soft); }

.wrap { max-width: var(--maxw); margin: 0 auto; }

.rule { height: 1px; border: 0; border-radius: var(--r-pill); background: var(--line-soft); }

/* FOOTER */

.site-footer {
  padding: 2.6rem var(--gutter);
  border-top: 1px solid var(--line-soft);
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  align-items: center;
  justify-content: space-between;
  font-size: .72rem;
  letter-spacing: .08em;
  color: var(--faint);
}

.site-footer a { transition: color .4s var(--ease-soft); }
.site-footer a:hover { color: var(--violet); }

/* APPARITIONS */

.reveal,
.reveal-left,
.reveal-right {
  opacity: 0;
  transition: opacity 1s var(--ease-soft), transform 1.05s var(--ease-soft);
  will-change: transform, opacity;
}

.reveal { transform: translateY(24px); }
.reveal-left { transform: translateX(-56px); }
.reveal-right { transform: translateX(56px); }

.reveal.is-visible,
.reveal-left.is-visible,
.reveal-right.is-visible { opacity: 1; transform: none; }

[data-delay="1"] { transition-delay: .1s; }
[data-delay="2"] { transition-delay: .2s; }
[data-delay="3"] { transition-delay: .3s; }
[data-delay="4"] { transition-delay: .4s; }

/* entrée sans déplacement : remplace les glissées quand le système demande moins d'animations */
@keyframes fadeOnly { from { opacity: 0; } }

/* sans mouvement mais pas sans douceur : les apparitions deviennent de simples fondus,
   les boucles décoratives s'arrêtent (chaque page le précise pour ses propres animations)
   et les survols gardent leurs transitions de couleur */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal, .reveal-left, .reveal-right { transform: none; }
}

/* RESPONSIVE */

@media (max-width: 980px) {
  .nav-links, .nav-admin { display: none; }
  .burger { display: block; }
  .site-nav { padding: 0 .55rem 0 .9rem; }
}

@media (max-width: 460px) {
  :root { --nav-h: 62px; }
  .lang-toggle { padding: .45rem .7rem; }
  .nav-logo span { display: none; }
}