:root{
  --bleu:#2563eb; --bleu-fonce:#1e40af; --vert:#16a34a; --rouge:#dc2626;
  --orange:#ea580c; --gris:#64748b; --gris-clair:#f1f5f9; --bord:#e2e8f0;
  --texte:#1e293b; --fond:#f8fafc; --radius:10px;
}
*{box-sizing:border-box}
body{margin:0;font-family:system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  background:var(--fond);color:var(--texte);line-height:1.5}
a{color:var(--bleu);text-decoration:none}
a:hover{text-decoration:underline}

/* Barre de navigation */
.barre{display:flex;align-items:center;justify-content:space-between;
  background:rgba(255,255,255,.85);backdrop-filter:blur(8px);
  border-bottom:1px solid var(--bord);padding:.7rem 1.5rem;
  position:sticky;top:0;z-index:10;box-shadow:0 1px 8px rgba(0,0,0,.04)}
.logo{display:inline-flex;align-items:center;gap:.45rem;
  font-weight:800;font-size:1.2rem;color:var(--bleu);text-decoration:none}
.logo:hover{text-decoration:none}
.logo-icone{display:inline-flex;align-items:center;justify-content:center;
  width:32px;height:32px;border-radius:9px;font-size:1.05rem;
  background:linear-gradient(135deg,var(--bleu),var(--bleu-fonce));
  box-shadow:0 2px 6px rgba(37,99,235,.35)}
.nav a:not(.btn):not(.cloche):not(.lien-profil):hover{color:var(--bleu)}

/* Liens Connexion / Inscription (visiteur) */
.lien-nav{font-weight:600;font-size:.9rem;padding:.4rem .9rem;border-radius:8px;
  color:var(--bleu);border:1px solid var(--bord);background:#fff;
  transition:border-color .15s,background .15s,color .15s}
.lien-nav:hover{background:var(--gris-clair);border-color:var(--bleu);color:var(--bleu-fonce);text-decoration:none}

.btn-inscription{font-weight:700;
  background:linear-gradient(135deg,var(--bleu),var(--bleu-fonce))}
.btn-inscription:hover{background:linear-gradient(135deg,var(--bleu-fonce),#172e7a)}
.nav{display:flex;align-items:center;gap:1rem}
.nav a{color:var(--texte)}
.nom-user{color:var(--gris);font-size:.9rem}

/* Conteneurs */
.conteneur{max-width:980px;margin:1.5rem auto;padding:0 1rem}
.centre{display:flex;min-height:100vh;align-items:center;justify-content:center;padding:1rem}
.carte{background:#fff;border:1px solid var(--bord);border-radius:var(--radius);
  padding:1.5rem;margin-bottom:1.2rem;box-shadow:0 1px 3px rgba(0,0,0,.04)}
.grille{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:1rem}

h1{font-size:1.6rem;margin:.2rem 0 1rem}
h2{font-size:1.25rem;margin:.2rem 0 .8rem}
h3{font-size:1.05rem;margin:.2rem 0 .5rem}

/* Boutons */
.btn{display:inline-block;background:var(--bleu);color:#fff;border:none;
  padding:.6rem 1rem;border-radius:8px;cursor:pointer;font-size:.95rem;text-decoration:none;
  transition:background .18s,transform .12s,box-shadow .18s}
.btn:hover{background:var(--bleu-fonce);text-decoration:none;transform:translateY(-2px);
  box-shadow:0 6px 16px rgba(37,99,235,.3)}
.btn:active{transform:translateY(0);box-shadow:0 2px 6px rgba(37,99,235,.25)}
.btn:focus-visible{outline:2px solid var(--bleu);outline-offset:2px}
.btn-sm{padding:.35rem .7rem;font-size:.85rem}
.btn-vert{background:var(--vert)}.btn-vert:hover{background:#15803d}
.btn-rouge{background:var(--rouge)}.btn-rouge:hover{background:#b91c1c}
.btn-gris{background:var(--gris)}.btn-gris:hover{background:#475569}
.btn-bloc{display:block;width:100%;text-align:center}

/* Formulaires */
label{display:block;font-weight:600;margin:.8rem 0 .3rem;font-size:.92rem}
input,textarea,select{width:100%;padding:.6rem;border:1px solid var(--bord);
  border-radius:8px;font-size:.95rem;font-family:inherit;background:#fff}
input:focus,textarea:focus,select:focus{outline:none;border-color:var(--bleu)}
textarea{min-height:90px;resize:vertical}
.muet{color:var(--gris);font-size:.88rem}

/* Alertes */
.alerte{padding:.7rem 1rem;border-radius:8px;margin-bottom:1rem;font-size:.92rem;
  background:#eff6ff;border:1px solid #bfdbfe}
.alerte-success{background:#f0fdf4;border-color:#bbf7d0;color:#166534}
.alerte-error,.alerte-danger{background:#fef2f2;border-color:#fecaca;color:#991b1b}
.alerte-info{background:#eff6ff;border-color:#bfdbfe;color:#1e40af}

/* Badges */
.badge{display:inline-block;padding:.15rem .55rem;border-radius:999px;font-size:.72rem;
  font-weight:700;text-transform:uppercase;letter-spacing:.03em}
.badge-admin{background:#fef3c7;color:#92400e}
.badge-prof{background:#dbeafe;color:#1e40af}
.badge-etudiant{background:#dcfce7;color:#166534}
.badge-type{background:var(--gris-clair);color:var(--gris);text-transform:none;letter-spacing:0}

/* Code de cours */
.code-cours{font-family:ui-monospace,monospace;font-size:1.3rem;font-weight:800;
  letter-spacing:.15em;background:var(--gris-clair);padding:.4rem .8rem;
  border-radius:8px;display:inline-block;color:var(--bleu-fonce)}

/* Tableaux */
table{width:100%;border-collapse:collapse;font-size:.92rem}
th,td{text-align:left;padding:.6rem;border-bottom:1px solid var(--bord)}
th{color:var(--gris);font-size:.8rem;text-transform:uppercase}

/* Listes / contenus */
.item{border:1px solid var(--bord);border-radius:8px;padding:.9rem;margin-bottom:.7rem;background:#fff}
.item-titre{font-weight:700;margin:0 0 .3rem}
.entete-flex{display:flex;justify-content:space-between;align-items:flex-start;gap:1rem;flex-wrap:wrap}
.liste-install{line-height:2}
.commentaire{border-left:3px solid var(--bord);padding:.4rem .8rem;margin:.5rem 0;background:var(--gris-clair);border-radius:0 6px 6px 0}
.commentaire .meta{font-size:.8rem;color:var(--gris)}
.pied{text-align:center;color:var(--gris);font-size:.85rem;padding:2rem 1rem}
.actions{display:flex;gap:.5rem;flex-wrap:wrap;margin-top:.6rem}
.pre-wrap{white-space:pre-wrap}
.video-wrap{position:relative;padding-bottom:56.25%;height:0;overflow:hidden;border-radius:8px}
.video-wrap iframe,.video-wrap video{position:absolute;top:0;left:0;width:100%;height:100%;border:0}
.tabs{display:flex;gap:.5rem;margin-bottom:1rem;flex-wrap:wrap}
.tabs a{padding:.4rem .9rem;border:1px solid var(--bord);border-radius:999px;color:var(--texte)}
.tabs a.actif{background:var(--bleu);color:#fff;border-color:var(--bleu)}

/* Cloche de notifications */
.cloche{position:relative;display:inline-flex;align-items:center;text-decoration:none;font-size:1.25rem;line-height:1}
.cloche:hover{text-decoration:none;transform:scale(1.08)}
.notif-badge{position:absolute;top:-8px;right:-10px;background:var(--rouge);color:#fff;
  font-size:.65rem;font-weight:700;min-width:17px;height:17px;padding:0 4px;border-radius:999px;
  display:flex;align-items:center;justify-content:center;border:2px solid #fff}
.notif-ligne{display:flex;gap:.8rem;align-items:flex-start;padding:.7rem .4rem;border-bottom:1px solid var(--bord);
  text-decoration:none;color:var(--texte)}
.notif-ligne:last-child{border-bottom:0}
.notif-ligne:hover{background:var(--gris-clair);text-decoration:none}
.notif-icone{font-size:1.3rem;line-height:1.3}
.notif-corps{display:flex;flex-direction:column;gap:.15rem}
.notif-texte{font-weight:600}

/* Choix du rôle à l'inscription */
.choix-role{display:flex;gap:.7rem;margin:.3rem 0 1rem}
.choix-carte{flex:1;display:flex;flex-direction:column;align-items:center;text-align:center;gap:.25rem;
  padding:.9rem .6rem;border:2px solid var(--bord);border-radius:10px;cursor:pointer;transition:.15s}
.choix-carte:hover{border-color:var(--bleu)}
.choix-carte input{display:none}
.choix-carte:has(input:checked){border-color:var(--bleu);background:var(--gris-clair);box-shadow:0 0 0 2px var(--bleu) inset}
.choix-icone{font-size:1.7rem;line-height:1}
.choix-titre{font-weight:700}
.choix-desc{font-size:.78rem;color:var(--gris)}

/* Avatar & profil */
.avatar{display:inline-flex;align-items:center;justify-content:center;border-radius:50%;
  background:linear-gradient(135deg,var(--bleu),var(--bleu-fonce));color:#fff;font-weight:700;
  width:64px;height:64px;font-size:1.6rem;flex:none;text-transform:uppercase;
  box-shadow:0 2px 6px rgba(37,99,235,.35)}
.avatar-sm{width:32px;height:32px;font-size:.95rem;box-shadow:none}
.avatar-img{background-size:cover;background-position:center;color:transparent}
.photo-champ{display:flex;align-items:center;gap:.8rem;margin-bottom:.4rem}
.photo-champ .avatar-sm{width:48px;height:48px;font-size:1.2rem}
.photo-champ input[type=file]{flex:1}
.case-ligne{display:flex;align-items:center;gap:.4rem;font-weight:400;font-size:.85rem}
.case-ligne input{width:auto}

/* ===== Tableau de bord ===== */
/* Bannière d'accueil */
.dash-banniere{display:flex;align-items:center;gap:1rem;
  background:linear-gradient(120deg,var(--bleu),var(--bleu-fonce));color:#fff;
  border-radius:var(--radius);padding:1.3rem 1.5rem;margin-bottom:1.3rem;
  box-shadow:0 6px 18px rgba(37,99,235,.25)}
.dash-banniere .avatar{background:rgba(255,255,255,.2);box-shadow:none}
.dash-banniere .avatar-img{box-shadow:0 0 0 2px rgba(255,255,255,.5)}
.dash-banniere h1{margin:0;font-size:1.45rem;color:#fff}
.dash-banniere p{margin:.15rem 0 0;color:rgba(255,255,255,.85);font-size:.92rem}

/* Cartes statistiques */
.stats-grille{display:grid;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:1rem;margin-bottom:1.3rem}
.stat-carte{display:flex;align-items:center;gap:.9rem;background:#fff;border:1px solid var(--bord);
  border-radius:var(--radius);padding:1.1rem 1.2rem;box-shadow:0 1px 3px rgba(0,0,0,.04)}
.stat-icone{width:48px;height:48px;border-radius:12px;display:flex;align-items:center;justify-content:center;
  font-size:1.5rem;flex:none}
.stat-bleu{background:#dbeafe}.stat-vert{background:#dcfce7}.stat-orange{background:#ffedd5}
.stat-num{font-size:1.7rem;font-weight:800;line-height:1}
.stat-lib{color:var(--gris);font-size:.85rem;margin-top:.15rem}

/* Cartes de cours */
.cours-carte{position:relative;overflow:hidden;display:flex;flex-direction:column;
  transition:transform .15s,box-shadow .15s}
.cours-carte::before{content:"";position:absolute;top:0;left:0;right:0;height:4px;
  background:linear-gradient(90deg,var(--bleu),var(--vert))}
.cours-carte:hover{transform:translateY(-3px);box-shadow:0 8px 22px rgba(0,0,0,.09)}
.cours-carte h3{display:flex;align-items:center;gap:.4rem}
.cours-carte .cours-desc{color:var(--gris);font-size:.9rem;flex:1;min-height:1.2em}
.cours-carte .actions{margin-top:.9rem}

/* État vide */
.vide{text-align:center;padding:2.5rem 1rem;color:var(--gris)}
.vide .vide-icone{font-size:2.5rem;display:block;margin-bottom:.5rem}

/* Puce de profil dans la barre */
.lien-profil{display:inline-flex;align-items:center;gap:.5rem;text-decoration:none;color:var(--texte);
  padding:.25rem .65rem .25rem .3rem;border:1px solid var(--bord);border-radius:999px;
  background:#fff;transition:.15s}
.lien-profil:hover{text-decoration:none;border-color:var(--bleu);background:var(--gris-clair);
  box-shadow:0 1px 4px rgba(0,0,0,.06)}
.lien-profil .avatar-sm{box-shadow:0 1px 3px rgba(37,99,235,.4)}
.lien-profil .nom-user{color:var(--texte);font-weight:600;font-size:.9rem;max-width:140px;
  overflow:hidden;text-overflow:ellipsis;white-space:nowrap}

/* ===== Page d'accueil (landing) ===== */
.hero{position:relative;overflow:hidden;text-align:center;color:#fff;
  background:linear-gradient(135deg,var(--bleu),var(--bleu-fonce));
  border-radius:var(--radius);padding:3.2rem 1.5rem;margin-bottom:1.5rem;
  box-shadow:0 10px 30px rgba(37,99,235,.3)}
.hero::after{content:"";position:absolute;top:-60px;right:-60px;width:220px;height:220px;
  background:rgba(255,255,255,.12);border-radius:50%}
.hero::before{content:"";position:absolute;bottom:-80px;left:-40px;width:200px;height:200px;
  background:rgba(255,255,255,.08);border-radius:50%}
.hero-contenu{position:relative;z-index:1;max-width:620px;margin:0 auto}
.hero-pastille{display:inline-block;background:rgba(255,255,255,.18);
  padding:.3rem .9rem;border-radius:999px;font-size:.8rem;font-weight:600;
  letter-spacing:.03em;margin-bottom:1rem}
.hero h1{font-size:2.2rem;line-height:1.15;margin:0 0 .8rem;color:#fff}
.hero p{font-size:1.05rem;color:rgba(255,255,255,.9);margin:0 auto 1.6rem;max-width:520px}
.hero .actions{justify-content:center}
.hero .btn{position:relative;overflow:hidden;padding:.7rem 1.5rem;font-size:1rem}
/* Reflet lumineux qui balaie le bouton au survol */
.hero .btn::before{content:"";position:absolute;top:0;left:-120%;width:60%;height:100%;
  background:linear-gradient(120deg,transparent,rgba(255,255,255,.55),transparent);
  transform:skewX(-20deg);transition:left .55s ease}
.hero .btn:hover::before{left:130%}
.hero .btn-clair{background:#fff;color:var(--bleu-fonce);font-weight:700}
.hero .btn-clair:hover{background:#fff;transform:translateY(-2px);box-shadow:0 8px 22px rgba(0,0,0,.22)}
.hero .btn-fantome{background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.6);color:#fff}
.hero .btn-fantome:hover{background:rgba(255,255,255,.22);transform:translateY(-2px);box-shadow:0 8px 22px rgba(0,0,0,.18)}

/* Apparition progressive du contenu du hero */
@keyframes apparition{from{opacity:0;transform:translateY(14px)}to{opacity:1;transform:translateY(0)}}
.hero-pastille{animation:apparition .5s ease both}
.hero h1{animation:apparition .5s ease .08s both}
.hero p{animation:apparition .5s ease .16s both}
.hero .actions{animation:apparition .5s ease .24s both}

/* Respect des préférences d'accessibilité */
@media (prefers-reduced-motion:reduce){
  .btn,.hero .btn::before,.fonction-carte,.cours-carte{transition:none;animation:none}
  .hero-pastille,.hero h1,.hero p,.hero .actions{animation:none}
}

/* Cartes de présentation */
.fonctions{margin-top:.5rem}
.fonction-carte{text-align:center;transition:transform .15s,box-shadow .15s}
.fonction-carte:hover{transform:translateY(-3px);box-shadow:0 8px 22px rgba(0,0,0,.08)}
.fonction-icone{width:54px;height:54px;margin:0 auto .7rem;border-radius:14px;
  display:flex;align-items:center;justify-content:center;font-size:1.7rem}
.fonction-carte h3{margin:0 0 .4rem;font-size:1.1rem}

/* ===== Pages d'authentification (connexion / inscription) ===== */
.auth-carte{max-width:420px;margin:2rem auto;padding:2rem 1.8rem}
.auth-entete{text-align:center;margin-bottom:1.6rem}
.auth-logo{display:inline-flex;align-items:center;justify-content:center;width:60px;height:60px;
  margin-bottom:.8rem;border-radius:16px;font-size:1.8rem;
  background:linear-gradient(135deg,var(--bleu),var(--bleu-fonce));color:#fff;
  box-shadow:0 6px 18px rgba(37,99,235,.35)}
.auth-titre{font-size:1.5rem;margin:0}
.auth-sous{color:var(--gris);font-size:.92rem;margin:.3rem 0 0}
.auth-carte .btn-bloc{margin-top:1.4rem;padding:.7rem 1rem;font-size:1rem}
.auth-pied{text-align:center;margin:1.4rem 0 0;padding-top:1.2rem;
  border-top:1px solid var(--bord);color:var(--gris);font-size:.9rem}
.auth-pied a{font-weight:600}
.auth-oubli{text-align:right;margin:.5rem 0 0;font-size:.85rem}

/* Champ avec icône */
.champ{position:relative}
.champ .champ-icone{position:absolute;left:.85rem;top:50%;transform:translateY(-50%);
  font-size:1rem;line-height:1;opacity:.55;pointer-events:none}
.champ input{padding-left:2.4rem}

/* En-tête de la page profil */
.profil-entete{display:flex;align-items:center;gap:1.2rem;
  background:linear-gradient(135deg,#eff6ff,#fff);border-color:#dbeafe}
.profil-entete h2{font-size:1.4rem}
.profil-table th{width:200px;color:var(--gris);font-weight:600;vertical-align:top}

/* ===== Sélecteur de langue (FR / EN / AR) ===== */
.lang-switch{display:inline-flex;align-items:center;gap:2px;background:#fff;
  border:1px solid var(--bord);border-radius:999px;padding:2px}
.lang-opt{padding:.22rem .5rem;border-radius:999px;font-size:.72rem;font-weight:700;
  color:var(--gris);line-height:1;text-decoration:none;transition:.15s}
.lang-opt:hover{background:var(--gris-clair);color:var(--bleu-fonce);text-decoration:none}
.lang-opt.actif{background:var(--bleu);color:#fff}

/* ===== Support RTL (arabe) ===== */
[dir="rtl"]{text-align:right}
[dir="rtl"] .champ .champ-icone{left:auto;right:.85rem}
[dir="rtl"] .champ input{padding-left:.6rem;padding-right:2.4rem}
[dir="rtl"] th,[dir="rtl"] td{text-align:right}
[dir="rtl"] .commentaire{border-left:0;border-right:3px solid var(--bord);border-radius:6px 0 0 6px}
[dir="rtl"] .notif-badge{right:auto;left:-10px}
[dir="rtl"] .auth-oubli{text-align:left}
[dir="rtl"] .profil-table th{text-align:right}
[dir="rtl"] .liste-install{padding-right:1.2rem;padding-left:0}

/* ===== Responsive mobile ===== */
@media (max-width:720px){
  .barre{padding:.6rem .9rem;flex-wrap:wrap;gap:.5rem}
  .logo{font-size:1.05rem}
  .nav{gap:.5rem;flex-wrap:wrap;justify-content:flex-end;width:100%}
  .nom-user,.lien-profil .nom-user{display:none}          /* gagne de la place */
  .lien-profil{padding:.25rem;border-radius:50%}
  .conteneur{margin:1rem auto;padding:0 .8rem}

  h1{font-size:1.35rem}
  .hero{padding:2.2rem 1.1rem}
  .hero h1{font-size:1.7rem}
  .hero p{font-size:.98rem}
  .hero .actions{flex-direction:column}
  .hero .actions .btn{width:100%}

  .grille{grid-template-columns:1fr}
  .stats-grille{grid-template-columns:1fr 1fr}
  .dash-banniere{flex-direction:column;text-align:center;gap:.6rem}
  .profil-entete{flex-direction:column;text-align:center}
  .entete-flex{flex-direction:column}

  /* Tables défilables horizontalement sur petit écran */
  table{display:block;overflow-x:auto;white-space:nowrap;-webkit-overflow-scrolling:touch}
  .auth-carte{margin:1rem auto;padding:1.5rem 1.2rem}
  .choix-role{flex-direction:column}
}

@media (max-width:420px){
  .stats-grille{grid-template-columns:1fr}
  .lang-switch{order:-1}                                  /* langue en premier sur très petit écran */
  .badge{display:none}                                    /* masque le badge de rôle, place limitée */
}