:root{
  --bg:#F8FAFC;
  --white:#FFFFFF;
  --ink:#0F172A;
  --ink-soft:#64748B;
  --line:#E2E8F0;
  --indigo:#4F46E5;
  --indigo-dark:#4338CA;
  --indigo-soft:#EEF2FF;
  --mint:#10B981;
  --mint-soft:#ECFDF5;
  --amber:#F59E0B;
  --radius:16px;
  --font-head:'Manrope', sans-serif;
  --font-body:'Inter', sans-serif;
}
*{box-sizing:border-box;}
html,body{margin:0;padding:0;}
body{ background:var(--bg); color:var(--ink); font-family:var(--font-body); -webkit-font-smoothing:antialiased; }
.app{ max-width:1220px; margin:0 auto; padding:0 32px 90px; }

h1,h2,h3{ font-family:var(--font-head); margin:0; }
a{ text-decoration:none; }

/* ===== NAVBAR ===== */
.navbar{ display:flex; align-items:center; justify-content:space-between; padding:26px 0; }
.logo{ display:flex; align-items:center; gap:10px; font-family:var(--font-head); font-weight:800; font-size:18px; color:var(--ink); }
.logo .mark{ display:inline-flex; align-items:center; justify-content:center; width:32px; height:32px; border-radius:9px; background:linear-gradient(135deg,#5B5BF8,#6C63FF); color:#FFF; font-size:15px; font-weight:800; }
.navlinks{ display:flex; gap:34px; }
.navlinks a{ color:var(--ink); font-size:14.5px; font-weight:500; }
.navlinks a.current{ color:var(--indigo); position:relative; }
.navlinks a.current::after{ content:""; position:absolute; left:0; right:0; bottom:-8px; height:2px; background:var(--indigo); border-radius:2px; }
.nav-actions{ display:flex; gap:10px; align-items:center; }

.btn{ font-family:var(--font-body); font-weight:600; font-size:14px; padding:11px 20px; border-radius:10px; border:none; cursor:pointer; display:inline-flex; align-items:center; gap:8px; }
.btn-primary{ background:var(--indigo); color:white; }
.btn-primary:hover{ background:var(--indigo-dark); }
.btn-outline{ background:var(--white); color:var(--ink); border:1px solid var(--line); }
.btn-outline:hover{ border-color:var(--indigo); color:var(--indigo); }

/* ===== HERO ===== */
.hero{ display:grid; grid-template-columns:1.08fr 0.92fr; gap:52px; align-items:center; padding:36px 0 60px; }
.badge{ display:inline-flex; align-items:center; gap:8px; background:var(--indigo-soft); color:var(--indigo); font-size:13px; font-weight:600; padding:8px 16px; border-radius:999px; margin-bottom:22px; }
.hero h1{ font-size:clamp(32px,3.7vw,48px); line-height:1.08; font-weight:800; margin-bottom:20px;
          text-wrap:balance; }   /* repartit les mots au lieu de laisser des lignes orphelines */
.hero h1 .accent{ color:var(--indigo); }
.hero p.lede{ font-size:16px; line-height:1.65; color:var(--ink-soft); max-width:520px; margin-bottom:30px; }
.hero-cta{ display:flex; gap:12px; }

.hero-art{ position:relative; height:440px; }
.hero-art .blob{ position:absolute; inset:0; background:linear-gradient(135deg, var(--indigo-soft), #F5F3FF); border-radius:32px; }
.hero-art .laptop{ position:absolute; left:8%; bottom:14%; width:58%; }
.hero-art .float-card{ position:absolute; background:white; border-radius:12px; box-shadow:0 14px 30px -12px rgba(15,23,42,0.18); padding:12px 16px; display:flex; align-items:center; gap:10px; font-size:12.5px; font-weight:600; }
.fc-icon{ width:32px; height:32px; border-radius:9px; display:flex; align-items:center; justify-content:center; font-size:15px; flex-shrink:0; }
.hero-art .card-1{ top:12%; left:6%; }
.hero-art .card-2{ top:34%; left:0%; }
.hero-art .card-3{ top:6%; right:2%; text-align:left; }
.hero-art .eq{ position:absolute; font-family:var(--font-head); font-weight:700; color:var(--indigo); font-size:20px; opacity:0.75; }
.hero-art .eq1{ top:18%; right:24%; }
.hero-art .eq2{ bottom:22%; right:8%; }

.feature-strip{ background:white; border:1px solid var(--line); border-radius:var(--radius); padding:30px; display:grid; grid-template-columns:repeat(4,1fr); gap:26px; margin-bottom:24px; box-shadow:0 20px 40px -30px rgba(15,23,42,0.15); }
.feature-strip .f{ display:flex; gap:12px; align-items:flex-start; }
.f-ic{ width:42px; height:42px; border-radius:11px; display:flex; align-items:center; justify-content:center; font-size:18px; flex-shrink:0; }
.feature-strip h4{ font-family:var(--font-head); font-size:14.5px; margin:0 0 4px; }
.feature-strip p{ font-size:12.5px; color:var(--ink-soft); line-height:1.5; margin:0; }

.stats-bar{ background:var(--indigo-soft); border-radius:var(--radius); padding:26px 30px; display:grid; grid-template-columns:repeat(4,1fr); gap:20px; }
.stats-bar .s{ display:flex; align-items:center; gap:12px; }
.stats-bar .ic{ width:34px; height:34px; }
.stats-bar b{ display:block; font-family:var(--font-head); font-size:19px; }
.stats-bar span{ font-size:12px; color:var(--ink-soft); }

.section{ padding:70px 0 10px; }
.section-head{ text-align:center; max-width:560px; margin:0 auto 40px; }
.section-head h2{ font-size:30px; margin-top:12px; }
.section-head p{ color:var(--ink-soft); margin-top:10px; font-size:15px; }
.kicker{ color:var(--indigo); font-weight:700; font-size:13px; text-transform:uppercase; letter-spacing:.04em; }

.steps{ display:grid; grid-template-columns:repeat(3,1fr); gap:22px; }
.step{ background:white; border:1px solid var(--line); border-radius:var(--radius); padding:26px; }
.step .n{ width:34px; height:34px; border-radius:10px; background:var(--indigo-soft); color:var(--indigo); font-family:var(--font-head); font-weight:800; display:flex; align-items:center; justify-content:center; font-size:14px; margin-bottom:16px; }
.step h3{ font-size:17px; margin-bottom:8px; }
.step p{ font-size:13.5px; color:var(--ink-soft); line-height:1.55; margin:0; }

footer{ margin-top:60px; padding-top:24px; border-top:1px solid var(--line); display:flex; justify-content:space-between; color:var(--ink-soft); font-size:12.5px; }

/* ===== APP SHELLS (pour les futures pages prof / élève) ===== */
.app-shell{ display:grid; grid-template-columns:236px 1fr; background:white; border:1px solid var(--line); border-radius:20px; overflow:hidden; min-height:660px; box-shadow:0 30px 60px -35px rgba(15,23,42,0.2); }
.sidebar{ background:var(--white); border-right:1px solid var(--line); padding:26px 18px; display:flex; flex-direction:column; }
.sidebar .logo{ margin-bottom:34px; padding:0 6px; }
.nav-item{ display:flex; align-items:center; gap:10px; padding:11px 12px; border-radius:10px; font-size:13.5px; font-weight:600; color:var(--ink-soft); margin-bottom:3px; }
.nav-item.active{ background:var(--indigo-soft); color:var(--indigo); }
.sidebar .who{ margin-top:auto; padding-top:18px; border-top:1px solid var(--line); display:flex; gap:10px; align-items:center; }
.avatar{ width:34px;height:34px;border-radius:50%; background:var(--indigo); color:white; display:flex; align-items:center; justify-content:center; font-family:var(--font-head); font-size:12.5px; font-weight:700; flex-shrink:0; }
.sidebar .who div b{ display:block; font-size:12.5px; }
.sidebar .who div span{ font-size:11px; color:var(--ink-soft); }

.main{ padding:32px 36px; background:var(--bg); }
.main-head{ display:flex; justify-content:space-between; align-items:flex-start; margin-bottom:26px; }
.main-head h2{ font-size:23px; }
.main-head .sub{ color:var(--ink-soft); font-size:13.5px; margin-top:4px; }

.card{ background:white; border:1px solid var(--line); border-radius:14px; }
.pill{ font-size:10.5px; font-weight:700; padding:4px 10px; border-radius:999px; text-transform:uppercase; letter-spacing:.03em; }
.pill-live{ background:var(--mint-soft); color:#0D9268; }
.pill-soon{ background:var(--indigo-soft); color:var(--indigo); }
.pill-done{ background:#F1F5F9; color:var(--ink-soft); }

.stat-row{ display:flex; gap:16px; margin-bottom:22px; }
.stat{ flex:1; padding:20px; }
.stat b{ font-family:var(--font-head); font-size:25px; display:block; }
.stat span{ font-size:12px; color:var(--ink-soft); }

.prof-grid{ display:grid; grid-template-columns:1.5fr 1fr; gap:20px; }
.agenda-item{ display:flex; align-items:center; gap:14px; padding:15px 18px; border-bottom:1px solid var(--line); }
.agenda-item:last-child{ border-bottom:none; }
.agenda-time{ font-family:var(--font-head); font-weight:700; font-size:13px; color:var(--ink-soft); width:52px; flex-shrink:0; }
.who-mini{ width:34px;height:34px;border-radius:50%; background:var(--indigo-soft); color:var(--indigo); display:flex; align-items:center; justify-content:center; font-weight:700; font-size:11px; flex-shrink:0;}
.agenda-item .info{ flex:1; }
.agenda-item .info b{ font-size:13.5px; display:block; }
.agenda-item .info span{ font-size:12px; color:var(--ink-soft); }
.mini-btn{ font-weight:600; font-size:12px; padding:8px 14px; border-radius:8px; border:1px solid var(--line); background:white; cursor:pointer; }
.mini-btn.primary{ background:var(--indigo); color:white; border-color:var(--indigo); }

.card-head{ padding:18px 18px 6px; display:flex; justify-content:space-between; align-items:center; }
.card-head h3{ font-size:15px; }

.students-list{ padding:4px 0; }
.student-row{ display:flex; align-items:center; gap:12px; padding:12px 18px; border-bottom:1px solid var(--line); }
.student-row:last-child{ border-bottom:none; }
.student-row .info{ flex:1; }
.student-row .info b{ font-size:13px; display:block; }
.student-row .info span{ font-size:11.5px; color:var(--ink-soft); }
.bar-track{ width:60px; height:5px; border-radius:3px; background:#EDF1F5; overflow:hidden; }
.bar-fill{ height:100%; background:var(--mint); border-radius:3px; }

.next-lesson{ background:linear-gradient(120deg, var(--indigo), #6D5BF0); color:white; border-radius:18px; padding:30px; display:flex; justify-content:space-between; align-items:center; margin-bottom:24px; }
.next-lesson .badge{ background:rgba(255,255,255,0.18); color:white; margin-bottom:14px; }
.next-lesson h3{ font-size:22px; margin:0 0 4px; }
.next-lesson p{ color:rgba(255,255,255,0.75); font-size:13px; margin:0; }
.countdown{ font-weight:700; font-size:13px; color:#C7FFE8; margin-top:14px; }
.join-btn{ background:white; color:var(--indigo); border:none; font-weight:700; font-size:14px; padding:15px 26px; border-radius:11px; cursor:pointer; }

.history-row{ display:flex; align-items:center; gap:14px; padding:14px 18px; border-bottom:1px solid var(--line); }
.history-row:last-child{ border-bottom:none; }
.history-row .info{ flex:1; }
.history-row .info b{ font-size:13.5px; display:block; }
.history-row .info span{ font-size:12px; color:var(--ink-soft); }

.topic-card{ padding:20px; }
.topic-card .tag{ font-size:11px; font-weight:700; color:var(--indigo); text-transform:uppercase; }
.topic-card p{ font-size:13px; line-height:1.55; margin:10px 0 0; color:var(--ink-soft); }

/* ===== FORMULAIRES (login / register) ===== */
.auth-wrap{ min-height:100vh; display:flex; align-items:center; justify-content:center; padding:40px 20px; }
.auth-card{ background:white; border:1px solid var(--line); border-radius:var(--radius); padding:40px; width:100%; max-width:420px; box-shadow:0 30px 60px -35px rgba(15,23,42,0.2); }
.auth-card .logo{ justify-content:center; margin-bottom:24px; }
.auth-card h2{ font-size:22px; text-align:center; margin-bottom:6px; }
.auth-card .sub{ text-align:center; color:var(--ink-soft); font-size:13.5px; margin-bottom:28px; }
.field{ margin-bottom:16px; }
.field label{ display:block; font-size:13px; font-weight:600; margin-bottom:6px; }
.field input, .field select{ width:100%; padding:11px 14px; border-radius:9px; border:1px solid var(--line); font-family:var(--font-body); font-size:14px; background:var(--bg); }
.field input:focus, .field select:focus{ outline:2px solid var(--indigo); outline-offset:1px; }
.auth-card .btn-primary{ width:100%; justify-content:center; margin-top:6px; padding:13px; }
.auth-switch{ text-align:center; margin-top:20px; font-size:13.5px; color:var(--ink-soft); }
.auth-switch a{ color:var(--indigo); font-weight:600; }
.alert{ padding:12px 14px; border-radius:9px; font-size:13px; margin-bottom:16px; }
.alert-error{ background:#FEF2F2; color:#B91C1C; border:1px solid #FECACA; }
.alert-success{ background:var(--mint-soft); color:#0D9268; border:1px solid #A7F3D0; }

/* ===== PROFILE DROPDOWN ===== */
.profile-btn{ position:relative; cursor:pointer; }
.avatar-sm{ width:36px;height:36px;border-radius:50%; background:linear-gradient(135deg,#5B5BF8,#6C63FF); color:white; display:flex; align-items:center; justify-content:center; font-family:var(--font-head); font-size:12px; font-weight:700; }
.profile-dropdown{ position:absolute; top:calc(100% + 6px); right:0; background:white; border:1px solid #EEF2F7; border-radius:10px; box-shadow:0 8px 24px rgba(18,38,63,0.1); min-width:170px; opacity:0; visibility:hidden; transform:translateY(-3px); transition:all 0.12s ease; z-index:100; overflow:hidden; }
.profile-dropdown.open{ opacity:1; visibility:visible; transform:translateY(0); }
.dropdown-link{ display:block; padding:10px 16px; font-size:13px; font-weight:500; color:#1D2433; text-decoration:none; transition:background 0.1s; }
.dropdown-link:hover{ background:#F7F9FC; }
.dropdown-link.text-red{ color:#DC2626; }

@media (max-width:860px){
  .hero{ grid-template-columns:1fr; }
  .hero-art{ display:none; }
  .steps{ grid-template-columns:1fr; }
  .feature-strip, .stats-bar{ grid-template-columns:repeat(2,1fr); }
  .app-shell{ grid-template-columns:1fr; }
  .sidebar{ flex-direction:row; overflow-x:auto; align-items:center; }
  .sidebar .who{ display:none; }
  .prof-grid{ grid-template-columns:1fr; }
  .navlinks{ display:none; }
}

/* ===== PORTRAIT DU PROFESSEUR (hero) ===== */
.hero-photo{
  position:absolute;
  z-index:1;                    /* sous les cartes flottantes */
  left:50%;
  top:50%;
  transform:translate(-50%, -50%);
  width:62%;
  aspect-ratio:4 / 5;
  margin:0;
  border-radius:26px;
  overflow:hidden;
  background:#E2E8F0;
  box-shadow:0 34px 60px -26px rgba(15,23,42,0.42);
  /* Un liseré clair détache la photo du dégradé de fond */
  outline:6px solid rgba(255,255,255,0.9);
  outline-offset:-1px;
}
.hero-photo img{
  width:100%;
  height:100%;
  object-fit:cover;
  object-position:center 22%;  /* le visage reste dans le cadre, même en portrait serré */
  display:block;
}
/* Léger fondu en bas : les cartes flottantes restent lisibles par-dessus */
.hero-photo::after{
  content:"";
  position:absolute;
  inset:auto 0 0 0;
  height:38%;
  background:linear-gradient(to top, rgba(15,23,42,0.28), transparent);
  pointer-events:none;
}

@media (max-width:1023px){
  /* Sous 1024px, deux colonnes compriment le titre : on empile.
     Le portrait reste visible — c'est lui qui installe la confiance —
     mais les cartes flottantes, illisibles a cette largeur, disparaissent. */
  /* La barre de navigation se brise a cette largeur : on la resserre
     plutot que de la masquer, pour garder l'acces aux pages. */
  .navbar{ padding:18px 0; gap:14px; }
  .navlinks{ gap:18px; }
  .navlinks a{ font-size:13.5px; white-space:nowrap; }
  .logo{ font-size:17px; white-space:nowrap; }
  .nav-actions .btn{ padding:9px 14px; font-size:13px; white-space:nowrap; }

  .hero{ grid-template-columns:1fr; gap:32px; padding:24px 0 48px; }
  .hero p.lede{ max-width:620px; }
  .hero-art.has-photo{
    display:block;
    position:relative;
    height:auto;
  }
  .hero-art.has-photo .float-card,
  .hero-art.has-photo .blob{ display:none; }
  .hero-photo{
    position:static;
    transform:none;
    width:100%;
    max-width:340px;
    margin:0 auto;
    outline-width:4px;
  }
}


/* Les cartes et le portrait se superposent : les cartes passent devant,
   sinon elles disparaissent derriere la photo. */
.hero-art .float-card{ z-index:3; }
.hero-art .blob{ z-index:0; }

/* Avec une photo, les equations decoratives n'ont plus de place : le cadre
   occupe toute la hauteur. On les retire plutot que de les laisser deborder. */
.hero-art.has-photo .eq{ display:none; }


/* ============================================================
   NAVIGATION MOBILE
   ------------------------------------------------------------
   Sous 860 px, la barre masquait ses liens sans rien proposer à
   la place : les pages internes devenaient inatteignables au
   téléphone. Le bouton et le panneau ci-dessous sont créés par
   assets/js/nav.js à partir des liens déjà présents.
   ============================================================ */

/* Bouton hamburger — absent au-dessus de 860 px */
.nav-toggle{
  display:none;
  position:relative;
  z-index:70;
  width:44px; height:44px;          /* 44 px : cible tactile confortable */
  flex-direction:column;
  align-items:center;
  justify-content:center;
  gap:5px;
  padding:0;
  border:1px solid var(--line);
  border-radius:11px;
  background:var(--white);
  cursor:pointer;
}
.nav-toggle span{
  display:block;
  width:19px; height:2px;
  border-radius:2px;
  background:var(--ink);
  transition:transform .2s ease, opacity .2s ease;
}
.nav-toggle.open span:nth-child(1){ transform:translateY(7px) rotate(45deg); }
.nav-toggle.open span:nth-child(2){ opacity:0; }
.nav-toggle.open span:nth-child(3){ transform:translateY(-7px) rotate(-45deg); }

/* Panneau coulissant */
.nav-panel{
  display:none;
  position:fixed;
  top:0; right:0;
  width:min(82vw, 310px);
  height:100%;
  height:100dvh;
  z-index:65;
  background:var(--white);
  box-shadow:-18px 0 40px -24px rgba(15,23,42,.45);
  padding:84px 22px 28px;
  overflow-y:auto;
  transform:translateX(100%);
  /* visibility, et pas seulement transform : un panneau simplement décalé
     resterait exposé aux lecteurs d'écran et à la tabulation. */
  visibility:hidden;
  transition:transform .22s ease, visibility .22s;
}
.nav-panel.open{ transform:translateX(0); visibility:visible; }

.nav-panel-close{
  position:absolute;
  top:18px; right:18px;
  width:42px; height:42px;
  display:flex; align-items:center; justify-content:center;
  padding:0; line-height:1;
  font-size:28px; color:var(--ink-soft);
  border:1px solid var(--line);
  border-radius:11px;
  background:var(--white);
  cursor:pointer;
}
.nav-panel-close:hover{ color:var(--ink); border-color:var(--indigo); }

.nav-panel-links{ display:flex; flex-direction:column; }
.nav-panel-links a{
  padding:14px 4px;
  font-size:15.5px;
  font-weight:500;
  color:var(--ink);
  border-bottom:1px solid var(--line);
}
.nav-panel-links a.current{ color:var(--indigo); font-weight:700; }

.nav-panel-actions{ display:flex; flex-direction:column; gap:10px; margin-top:22px; }
.nav-panel-actions .btn{ justify-content:center; width:100%; }
.nav-panel-actions .nav-panel-danger{ color:#DC2626; border-color:#FECACA; }

/* Voile derrière le panneau */
.nav-backdrop{
  display:none;
  position:fixed;
  inset:0;
  z-index:60;
  background:rgba(15,23,42,.42);
  opacity:0;
  /* Indispensable : opacity:0 laisse l'élément capter les clics. Sans cette
     ligne, le voile recouvre la page fermée et plus rien n'est cliquable. */
  pointer-events:none;
  transition:opacity .22s ease;
}
.nav-backdrop.open{ opacity:1; pointer-events:auto; }

/* Tableaux larges : c'est le tableau qui défile, pas la page entière. */
.table-wrap{ overflow-x:auto; -webkit-overflow-scrolling:touch; }

@media (max-width:860px){
  /* 32 px de marge de chaque côté, c'est un sixième d'un écran de 390. */
  .app{ padding:0 18px 64px; }

  /* La barre suit le défilement : sans cela, le menu ne serait
     atteignable qu'en haut de page. */
  .navbar{
    position:sticky;
    top:0;
    z-index:55;
    background:var(--bg);
    padding:14px 0;
  }

  .nav-toggle{ display:flex; }
  .nav-panel, .nav-backdrop{ display:block; }

  /* Les boutons de la barre partent dans le panneau : les garder
     ici bousculerait le logo sur un écran étroit. */
  .nav-actions{ display:none; }

  .table-wrap table{ min-width:460px; }
}