/* Syllabus — coquille de l'application (séparation vitrine/application, 2026-10-13). */
:root {
    --app-topbar-h: 56px;
    --app-sidebar-w: 248px;
    --app-tabbar-h: 58px;
}

html[data-taille="grand"] { font-size: 18px; }

/* Thème sombre : explicite, ou "système" + préférence OS. */
html[data-theme="sombre"] {
    --sy-bg: #0f172a; --sy-surface: #17223a; --sy-line: #2a3b57; --sy-ink: #e8ecf3; --sy-muted: #9aa7bd;
    --sy-blue: #5b8dff; --sy-blue-dark: #4876e0; --sy-navy: #c6d4f5;
}
@media (prefers-color-scheme: dark) {
    html[data-theme="systeme"] {
        --sy-bg: #0f172a; --sy-surface: #17223a; --sy-line: #2a3b57; --sy-ink: #e8ecf3; --sy-muted: #9aa7bd;
        --sy-blue: #5b8dff; --sy-blue-dark: #4876e0; --sy-navy: #c6d4f5;
    }
}
html[data-theme="sombre"] body, html[data-theme="sombre"] .app-topbar, html[data-theme="sombre"] .app-sidebar,
html[data-theme="sombre"] .app-tabbar, html[data-theme="sombre"] .app-chat-fenetre { color-scheme: dark; }
@media (prefers-color-scheme: dark) {
    html[data-theme="systeme"] body, html[data-theme="systeme"] .app-topbar, html[data-theme="systeme"] .app-sidebar,
    html[data-theme="systeme"] .app-tabbar, html[data-theme="systeme"] .app-chat-fenetre { color-scheme: dark; }
}

body.app-corps { background: var(--sy-bg); }

.app-topbar {
    position: sticky; top: 0; z-index: 50; height: var(--app-topbar-h);
    display: flex; align-items: center; justify-content: space-between; gap: 12px;
    padding: 0 16px; background: var(--sy-surface); border-bottom: 1px solid var(--sy-line);
}
.app-topbar__logo { display: flex; align-items: center; gap: 0; text-decoration: none; }
.app-topbar__logo img { height: 28px; width: auto; display: block; }
.app-topbar__logo span { font-family: Mulish, system-ui, sans-serif; font-weight: 800; font-size: 17px; color: var(--sy-ink); margin-left: -12px; }

.app-topbar__avatar { position: relative; }
.app-topbar__avatar-btn {
    display: flex; align-items: center; gap: 8px; height: 40px; padding: 0 10px 0 4px; border: 0; border-radius: 999px;
    background: transparent; cursor: pointer; font-family: Mulish, system-ui, sans-serif; font-weight: 700; color: var(--sy-ink);
}
.app-topbar__avatar-btn:hover { background: var(--sy-bg); }
.app-topbar__avatar-cercle {
    width: 32px; height: 32px; border-radius: 999px; background: var(--sy-blue); color: #fff;
    display: flex; align-items: center; justify-content: center; font-weight: 800; font-size: 14px; flex: none;
}
.app-topbar__menu {
    position: absolute; right: 0; top: calc(100% + 6px); min-width: 240px; background: var(--sy-surface);
    border: 1px solid var(--sy-line); border-radius: 14px; box-shadow: 0 16px 32px -12px rgba(15,23,42,.28);
    padding: 6px; display: grid; gap: 2px;
}
.app-topbar__menu a, .app-topbar__menu button {
    display: flex; align-items: center; gap: 10px; width: 100%; text-align: left; border: 0; background: none;
    padding: 9px 10px; border-radius: 9px; font-family: Mulish, system-ui, sans-serif; font-weight: 600; font-size: 14px;
    color: var(--sy-ink); cursor: pointer; text-decoration: none;
}
.app-topbar__menu a:hover, .app-topbar__menu button:hover { background: var(--sy-bg); }
.app-topbar__menu hr { margin: 4px 2px; border: 0; border-top: 1px solid var(--sy-line); }

.app-shell { display: flex; min-height: calc(100vh - var(--app-topbar-h)); }

.app-sidebar {
    width: var(--app-sidebar-w); flex: none; border-right: 1px solid var(--sy-line); background: var(--sy-surface);
    padding: 16px 10px; position: sticky; top: var(--app-topbar-h); height: calc(100vh - var(--app-topbar-h)); overflow-y: auto;
}
.app-sidebar__nav { display: grid; gap: 2px; margin: 0; padding: 0; list-style: none; }
.app-sidebar__nav a {
    display: flex; align-items: center; gap: 12px; padding: 10px 12px; border-radius: 10px; text-decoration: none;
    font-family: Mulish, system-ui, sans-serif; font-weight: 700; font-size: 15px; color: var(--sy-ink); position: relative;
}
.app-sidebar__nav a:hover { background: var(--sy-bg); }
.app-sidebar__nav a[aria-current="page"] { background: #eef0fd; color: var(--sy-blue-dark); }
html[data-theme="sombre"] .app-sidebar__nav a[aria-current="page"],
html[data-theme="systeme"] .app-sidebar__nav a[aria-current="page"] { background: rgba(91,141,255,.16); }
.app-sidebar__nav svg { flex: none; width: 22px; height: 22px; }
.app-sidebar__badge {
    margin-left: auto; min-width: 20px; height: 20px; padding: 0 5px; border-radius: 999px; background: #c5221f; color: #fff;
    font-size: 11px; font-weight: 800; display: flex; align-items: center; justify-content: center;
}
.app-sidebar__titre {
    margin: 18px 0 6px; padding: 0 12px; font-family: Mulish, system-ui, sans-serif; font-size: 12px; font-weight: 800;
    letter-spacing: .02em; color: var(--sy-muted); text-transform: uppercase;
}
.app-sidebar__epingler {
    display: flex; align-items: center; gap: 8px; padding: 8px 12px; border-radius: 10px; width: 100%; border: 1px dashed var(--sy-line);
    background: none; font-family: Mulish, system-ui, sans-serif; font-weight: 700; font-size: 13px; color: var(--sy-muted); cursor: pointer;
}
.app-sidebar__epingler:hover { color: var(--sy-blue); border-color: var(--sy-blue); }
.app-sidebar__raccourci { display: flex; align-items: center; gap: 8px; }
.app-sidebar__raccourci form { margin-left: auto; }
.app-sidebar__raccourci button[type="submit"] { border: 0; background: none; cursor: pointer; color: var(--sy-muted); font-size: 16px; line-height: 1; padding: 2px 6px; }
.app-sidebar__raccourci button[type="submit"]:hover { color: #c5221f; }

.app-main { flex: 1; min-width: 0; }

/* Chat Messenger */
.app-chat-bulle {
    position: fixed; right: 20px; bottom: 20px; z-index: 60; width: 56px; height: 56px; border-radius: 999px; border: 0;
    background: var(--sy-blue); color: #fff; display: flex; align-items: center; justify-content: center; cursor: pointer;
    box-shadow: 0 10px 24px -8px rgba(15,23,42,.4);
}
.app-chat-bulle svg { width: 26px; height: 26px; }
.app-chat-bulle__badge {
    position: absolute; top: -4px; right: -4px; min-width: 20px; height: 20px; padding: 0 5px; border-radius: 999px;
    background: #c5221f; color: #fff; font-size: 11px; font-weight: 800; display: flex; align-items: center; justify-content: center;
    border: 2px solid var(--sy-bg);
}
.app-chat-fenetre {
    position: fixed; right: 20px; bottom: 88px; z-index: 60; width: 340px; height: 460px; border-radius: 16px;
    background: var(--sy-surface); border: 1px solid var(--sy-line); box-shadow: 0 20px 48px -16px rgba(15,23,42,.35);
    display: flex; flex-direction: column; overflow: hidden;
}
.app-chat-fenetre__entete {
    display: flex; align-items: center; gap: 8px; padding: 10px 12px; border-bottom: 1px solid var(--sy-line);
    font-family: Mulish, system-ui, sans-serif; font-weight: 800; color: var(--sy-ink);
}
.app-chat-fenetre__entete button { border: 0; background: none; cursor: pointer; color: var(--sy-muted); padding: 4px; }
.app-chat-fenetre__corps { flex: 1; overflow-y: auto; padding: 10px 12px; display: grid; gap: 8px; align-content: start; }
.app-chat-fenetre__liste-fils { list-style: none; margin: 0; padding: 0; display: grid; }
.app-chat-fenetre__liste-fils li button {
    width: 100%; text-align: left; display: flex; align-items: center; gap: 8px; border: 0; background: none; cursor: pointer;
    padding: 10px 6px; border-radius: 10px; font-family: Mulish, system-ui, sans-serif; font-weight: 700; color: var(--sy-ink);
}
.app-chat-fenetre__liste-fils li button:hover { background: var(--sy-bg); }
.app-bulle-message { max-width: 80%; padding: 8px 12px; border-radius: 14px; font-family: Mulish, system-ui, sans-serif; font-size: 14px; font-weight: 600; line-height: 1.35; }
.app-bulle-message--eleve { justify-self: start; background: var(--sy-bg); color: var(--sy-ink); border: 1px solid var(--sy-line); }
.app-bulle-message--prof { justify-self: end; background: var(--sy-blue); color: #fff; }
.app-chat-fenetre__pied { display: flex; gap: 8px; padding: 10px; border-top: 1px solid var(--sy-line); }
.app-chat-fenetre__pied input {
    flex: 1; border: 1px solid var(--sy-line); border-radius: 999px; padding: 8px 12px; font-family: inherit; background: var(--sy-bg); color: var(--sy-ink);
}
.app-chat-fenetre__pied button {
    border: 0; background: var(--sy-blue); color: #fff; border-radius: 999px; padding: 0 16px; font-weight: 800; cursor: pointer;
}
.app-chat-fenetre__desactive { padding: 14px; text-align: center; color: var(--sy-muted); font-family: Mulish, system-ui, sans-serif; font-weight: 700; font-size: 13px; }

/* Barre d'onglets mobile */
.app-tabbar {
    display: none; position: fixed; bottom: 0; left: 0; right: 0; z-index: 55; height: var(--app-tabbar-h);
    background: var(--sy-surface); border-top: 1px solid var(--sy-line);
    padding-bottom: env(safe-area-inset-bottom, 0px);
}
.app-tabbar__liste { display: flex; height: 100%; margin: 0; padding: 0; list-style: none; }
.app-tabbar__liste a, .app-tabbar__liste button {
    flex: 1; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 2px;
    text-decoration: none; border: 0; background: none; cursor: pointer; font-family: Mulish, system-ui, sans-serif;
    font-size: 11px; font-weight: 700; color: var(--sy-muted); position: relative;
}
.app-tabbar__liste a[aria-current="page"] { color: var(--sy-blue); }
.app-tabbar__liste svg { width: 22px; height: 22px; }
.app-feuille {
    display: none; position: fixed; inset: 0; z-index: 65; background: var(--sy-surface);
}
.app-feuille__entete { display: flex; align-items: center; justify-content: space-between; padding: 14px 16px; border-bottom: 1px solid var(--sy-line); }
.app-feuille__contenu { padding: 10px; overflow-y: auto; height: calc(100% - 56px); }
.app-feuille__contenu a, .app-feuille__contenu button {
    display: flex; align-items: center; gap: 12px; width: 100%; text-align: left; border: 0; background: none;
    padding: 14px 10px; font-family: Mulish, system-ui, sans-serif; font-weight: 700; font-size: 16px; color: var(--sy-ink);
    text-decoration: none; cursor: pointer;
}
.app-feuille__contenu svg { width: 22px; height: 22px; flex: none; }

@media (max-width: 860px) {
    .app-sidebar { display: none; }
    .app-tabbar { display: block; }
    .app-shell { min-height: calc(100vh - var(--app-topbar-h) - var(--app-tabbar-h)); padding-bottom: var(--app-tabbar-h); }
    .app-chat-bulle { display: none; }
    .app-chat-fenetre.est-ouverte { right: 0; bottom: 0; left: 0; top: var(--app-topbar-h); width: auto; height: auto; border-radius: 0; }
}
@media (prefers-reduced-motion: reduce) { .app-chat-fenetre, .app-feuille { transition: none; } }