/* ── Reset & Base ─────────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
    --sidebar-w:       280px;
    --sidebar-w-col:   64px;
    --topbar-h:        56px;
    --accent:          #5b7cff;
    --accent-hover:    #415ff0;
    --accent-light:    #edf2ff;
    --bg:              linear-gradient(135deg, #f3f6ff 0%, #f8fafc 45%, #eef5ff 100%);
    --surface:         rgba(255, 255, 255, 0.94);
    --surface-strong:  #ffffff;
    --border:          #dfe6f4;
    --text:            #162033;
    --text-muted:      #5f6b86;
    --danger:          #eb5b5b;
    --success:         #1fb97a;
    --warning:         #ffb020;
    --folder-color:    #f0b429;
    --page-color:      #5b7cff;
    --radius:          12px;
    --shadow-sm:       0 8px 18px rgba(15, 23, 42, 0.08);
    --shadow-md:       0 18px 36px rgba(15, 23, 42, 0.16);
    --transition:      .18s ease;
}

html, body {
    height: 100%;
    overflow: hidden;
    font-family: 'Segoe UI', system-ui, sans-serif;
    font-size: 15px;
    color: var(--text);
    background: var(--bg);
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
}

body::before {
    content: "";
    position: fixed;
    inset: 0;
    background:
        radial-gradient(circle at top left, rgba(91, 124, 255, 0.10), transparent 18%),
        radial-gradient(circle at top right, rgba(31, 185, 122, 0.08), transparent 20%);
    pointer-events: none;
    z-index: -1;
}

/* ── Layout geral ─────────────────────────────────────────────────────────── */
.app-layout { display: flex; height: 100vh; overflow: hidden; }

/* ══════════════════════════════════════════════════════════════════════════════
   SIDEBAR
══════════════════════════════════════════════════════════════════════════════ */
.sidebar {
    width: var(--sidebar-w);
    min-width: var(--sidebar-w);
    height: 100vh;
    background: linear-gradient(180deg, rgba(255,255,255,0.98), rgba(247,249,255,0.97));
    border-right: 1px solid var(--border);
    box-shadow: 6px 0 24px rgba(15, 23, 42, 0.06);
    display: flex;
    flex-direction: column;
    transition: width var(--transition), min-width var(--transition);
    overflow: hidden;
    position: relative;
    z-index: 10;
}

.sidebar.collapsed {
    width: var(--sidebar-w-col);
    min-width: var(--sidebar-w-col);
}

/* Header da sidebar */
.sidebar-header {
    display: flex;
    align-items: center;
    gap: .6rem;
    padding: .95rem 1rem;
    border-bottom: 1px solid var(--border);
    flex-shrink: 0;
    overflow: hidden;
}
.sidebar-header:hover {
    background: linear-gradient(90deg, rgba(91,124,255,0.04), transparent);
}
.sidebar-logo  { font-size: 1.4rem; flex-shrink: 0; }
.sidebar-title { font-weight: 700; font-size: .95rem; color: var(--text); white-space: nowrap; flex: 1; transition: opacity var(--transition); }
.sidebar.collapsed .sidebar-title { opacity: 0; pointer-events: none; }

.sidebar-toggle-btn {
    margin-left: auto;
    flex-shrink: 0;
    transition: transform var(--transition);
}
.sidebar.collapsed .sidebar-toggle-btn { transform: rotate(180deg); }

/* Usuário */
.sidebar-user {
    display: flex;
    align-items: center;
    gap: .7rem;
    padding: .75rem 1rem;
    border-bottom: 1px solid var(--border);
    flex-shrink: 0;
    overflow: hidden;
}
.user-avatar {
    width: 30px; height: 30px;
    border-radius: 50%;
    background: var(--accent);
    color: #fff;
    font-weight: 700;
    font-size: .85rem;
    display: flex; align-items: center; justify-content: center;
    flex-shrink: 0;
}
.user-name  { font-size: .85rem; font-weight: 600; color: var(--text); white-space: nowrap; flex: 1; overflow: hidden; text-overflow: ellipsis; transition: opacity var(--transition); }
.logout-btn { color: var(--text-muted); font-size: 1.1rem; text-decoration: none; flex-shrink: 0; }
.logout-btn:hover { color: var(--danger); }
.sidebar.collapsed .user-name,
.sidebar.collapsed .logout-btn { opacity: 0; pointer-events: none; }

/* Botões de ação */
.sidebar-actions {
    display: flex;
    gap: .5rem;
    padding: .75rem 1rem;
    border-bottom: 1px solid var(--border);
    flex-shrink: 0;
    overflow: hidden;
}
.btn-action {
    flex: 1;
    padding: .45rem .55rem;
    background: linear-gradient(135deg, #edf2ff, #f7f9ff);
    color: var(--accent);
    border: 1px solid #dfe6ff;
    border-radius: 10px;
    font-size: .8rem;
    font-weight: 700;
    cursor: pointer;
    display: flex; align-items: center; gap: .35rem;
    transition: transform var(--transition), background var(--transition), border-color var(--transition), color var(--transition);
    white-space: nowrap;
    overflow: hidden;
}
.btn-action:hover {
    transform: translateY(-1px);
    background: linear-gradient(135deg, var(--accent), #6d89ff);
    color: #fff;
    border-color: var(--accent);
}
.btn-action:hover { background: var(--accent); color: #fff; }
.sidebar.collapsed .btn-action span + * { display: none; }
.sidebar.collapsed .sidebar-actions { flex-direction: column; }

/* Busca na árvore */
.tree-search { padding: .6rem 1rem; flex-shrink: 0; overflow: hidden; }
.tree-search input {
    width: 100%;
    padding: .45rem .75rem;
    border: 1.5px solid var(--border);
    border-radius: 6px;
    font-size: .85rem;
    background: var(--bg);
    transition: border-color var(--transition), opacity var(--transition);
}
.tree-search input:focus { outline: none; border-color: var(--accent); }
.sidebar.collapsed .tree-search { opacity: 0; pointer-events: none; }

/* Árvore de nós */
.tree-container { flex: 1; overflow-y: auto; padding: .5rem 0; }
.tree-loading { padding: 1rem; color: var(--text-muted); font-size: .85rem; text-align: center; }
.tree-empty   { padding: 1rem; color: var(--text-muted); font-size: .85rem; text-align: center; }

/* Nó individual */
.tree-node { position: relative; }

.tree-node-row {
    display: flex;
    align-items: center;
    gap: .35rem;
    padding: .45rem .75rem;
    cursor: pointer;
    border-radius: 10px;
    margin: 2px .45rem;
    transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
    user-select: none;
    white-space: nowrap;
    overflow: hidden;
}
.tree-node-row:hover {
    background: linear-gradient(135deg, #eef3ff, #f7f9ff);
    transform: translateX(1px);
}
.tree-node-row.active {
    background: linear-gradient(135deg, #edf2ff, #ffffff);
    color: var(--accent);
    box-shadow: inset 0 0 0 1px #dfe6ff;
}
.tree-node-row:hover  { background: var(--accent-light); }
.tree-node-row.active { background: var(--accent-light); color: var(--accent); font-weight: 600; }
.tree-node-row.active .node-icon { opacity: 1; }

.node-toggle {
    width: 16px; min-width: 16px;
    font-size: .65rem;
    color: var(--text-muted);
    transition: transform var(--transition);
    display: flex; align-items: center; justify-content: center;
}
.node-toggle.open { transform: rotate(90deg); }
.node-toggle.leaf { visibility: hidden; }

.node-icon { font-size: 1rem; flex-shrink: 0; }
.node-label { font-size: .88rem; overflow: hidden; text-overflow: ellipsis; flex: 1; }

/* Indentação recursiva */
.tree-children { padding-left: 1.2rem; }
.tree-children.hidden { display: none; }

/* ══════════════════════════════════════════════════════════════════════════════
   MAIN CONTENT
══════════════════════════════════════════════════════════════════════════════ */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    background: var(--bg);
}

/* Topbar */
.topbar {
    height: var(--topbar-h);
    background: linear-gradient(180deg, rgba(255,255,255,0.97), rgba(248,250,255,0.98));
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    gap: .75rem;
    padding: 0 1rem;
    flex-shrink: 0;
    box-shadow: 0 8px 16px rgba(15, 23, 42, 0.06);
    backdrop-filter: blur(10px);
}
.topbar-menu-btn { display: none; }

.breadcrumb { flex: 1; font-size: .88rem; color: var(--text-muted); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.breadcrumb strong { color: var(--text); }

.topbar-right { display: flex; align-items: center; gap: .75rem; flex-shrink: 0; }
.save-status  { font-size: .8rem; color: var(--text-muted); }
.save-status.saving  { color: var(--warning); }
.save-status.saved   { color: var(--success); }

/* Estado vazio */
.empty-state {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: .8rem;
    padding: 2rem;
    color: var(--text-muted);
    text-align: center;
    background: linear-gradient(180deg, rgba(255,255,255,0.72), rgba(255,255,255,0.92));
}
.empty-state::before {
    content: "";
    width: 72px;
    height: 72px;
    border-radius: 18px;
    background: linear-gradient(135deg, var(--accent), #86a3ff);
    box-shadow: 0 14px 28px rgba(91, 124, 255, 0.25);
    opacity: 0.12;
}
.empty-icon { font-size: 3.5rem; }
.empty-state h2 { font-size: 1.4rem; color: var(--text); }
.empty-state p  { max-width: 360px; line-height: 1.6; }

/* Editor */
.editor-wrapper {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    padding: 1rem;
    gap: 1rem;
    min-height: 0;
}

.editor-wrapper > * {
    border-radius: 16px;
}


/* Editor WYSIWYG (CKEditor) */
.editor-wrapper .ck-editor {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-height: 0;
    border-radius: 16px;
    overflow: hidden;
    border: 1px solid var(--border);
    box-shadow: var(--shadow-md);
    background: var(--surface-strong);
}
.editor-wrapper .ck-editor__top {
    border-bottom: 1px solid var(--border);
    background: linear-gradient(180deg, #fcfdff, #f6f8ff);
    padding: .35rem;
}
.editor-wrapper .ck-editor__top {
    border-bottom: 1px solid var(--border);
    background: var(--surface);
}
.editor-wrapper .ck-editor__main {
    flex: 1;
    min-height: 0;
    overflow: auto;
    background: var(--surface);
}
.editor-wrapper .ck-editor__editable {
    min-height: 420px;
    padding: 1rem 1.25rem;
    background: #fff;
    color: var(--text);
}
.editor-wrapper .ck-editor__editable:focus {
    outline: none;
}

/* ══════════════════════════════════════════════════════════════════════════════
   BOTÕES GENÉRICOS
══════════════════════════════════════════════════════════════════════════════ */
.btn-primary {
    padding: .55rem 1rem;
    background: linear-gradient(135deg, var(--accent), #7087ff);
    color: #fff;
    border: none;
    border-radius: 10px;
    font-size: .88rem;
    font-weight: 700;
    cursor: pointer;
    box-shadow: 0 10px 18px rgba(91, 124, 255, 0.22);
    transition: transform var(--transition), box-shadow var(--transition), filter var(--transition);
}
.btn-primary:hover {
    transform: translateY(-1px);
    filter: saturate(1.06);
    box-shadow: 0 14px 24px rgba(91, 124, 255, 0.28);
}
.btn-primary:hover { background: var(--accent-hover); }

.btn-secondary {
    padding: .55rem 1rem;
    background: rgba(255,255,255,0.78);
    color: var(--text-muted);
    border: 1px solid var(--border);
    border-radius: 10px;
    font-size: .88rem;
    font-weight: 700;
    cursor: pointer;
    transition: background var(--transition), color var(--transition), border-color var(--transition), transform var(--transition);
}
.btn-secondary:hover {
    background: var(--surface-strong);
    color: var(--text);
    border-color: #cbd6f3;
    transform: translateY(-1px);
}
.btn-secondary:hover { background: var(--bg); color: var(--text); }

.btn-icon {
    background: none;
    border: none;
    cursor: pointer;
    padding: .3rem .4rem;
    border-radius: 5px;
    font-size: .95rem;
    color: var(--text-muted);
    transition: background var(--transition), color var(--transition);
    line-height: 1;
}
.btn-icon:hover { background: var(--accent-light); color: var(--accent); }

/* ══════════════════════════════════════════════════════════════════════════════
   MODAL
══════════════════════════════════════════════════════════════════════════════ */
.modal-overlay {
    position: fixed; inset: 0;
    background: rgba(0,0,0,.45);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}
.modal-overlay.open { display: flex; }

.modal {
    background: var(--surface);
    border-radius: 12px;
    width: 100%;
    max-width: 400px;
    box-shadow: var(--shadow-md);
    overflow: hidden;
    animation: modalIn .18s ease;
}
@keyframes modalIn { from { transform: scale(.94); opacity: 0; } to { transform: scale(1); opacity: 1; } }

.modal-header {
    display: flex; align-items: center; justify-content: space-between;
    padding: 1rem 1.25rem;
    border-bottom: 1px solid var(--border);
}
.modal-header h3 { font-size: 1rem; }

.modal-body { padding: 1.25rem; }
.modal-body label { display: block; font-size: .85rem; font-weight: 600; margin-bottom: .4rem; color: var(--text-muted); }
.modal-body input {
    width: 100%; padding: .65rem .9rem;
    border: 1.5px solid var(--border);
    border-radius: 7px; font-size: .95rem;
    transition: border-color var(--transition);
}
.modal-body input:focus { outline: none; border-color: var(--accent); }

.modal-footer {
    display: flex; justify-content: flex-end; gap: .75rem;
    padding: .9rem 1.25rem;
    border-top: 1px solid var(--border);
}

/* ══════════════════════════════════════════════════════════════════════════════
   CONTEXT MENU
══════════════════════════════════════════════════════════════════════════════ */
.context-menu {
    position: fixed;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: .4rem 0;
    min-width: 180px;
    box-shadow: var(--shadow-md);
    z-index: 2000;
    display: none;
    list-style: none;
}
.context-menu.open { display: block; }
.context-menu li {
    padding: .55rem 1rem;
    font-size: .88rem;
    cursor: pointer;
    display: flex; align-items: center; gap: .5rem;
    transition: background var(--transition);
}
.context-menu li:hover   { background: var(--accent-light); }
.context-menu li.danger  { color: var(--danger); }
.context-menu li.danger:hover { background: #fdf0f0; }
.context-menu li.divider { height: 1px; background: var(--border); padding: 0; margin: .3rem 0; cursor: default; }
.context-menu li.divider:hover { background: var(--border); }

/* ══════════════════════════════════════════════════════════════════════════════
   TOAST
══════════════════════════════════════════════════════════════════════════════ */
.toast {
    position: fixed;
    bottom: 1.5rem; right: 1.5rem;
    padding: .75rem 1.25rem;
    border-radius: 8px;
    color: #fff;
    font-size: .88rem;
    font-weight: 600;
    background: var(--text);
    box-shadow: var(--shadow-md);
    opacity: 0;
    transform: translateY(10px);
    transition: opacity .25s, transform .25s;
    z-index: 3000;
    pointer-events: none;
}
.toast.show { opacity: 1; transform: translateY(0); }
.toast.success { background: var(--success); }
.toast.error   { background: var(--danger); }

/* ══════════════════════════════════════════════════════════════════════════════
   SCROLLBAR personalizada
══════════════════════════════════════════════════════════════════════════════ */
.tree-container::-webkit-scrollbar { width: 5px; }
.tree-container::-webkit-scrollbar-track { background: transparent; }
.tree-container::-webkit-scrollbar-thumb { background: var(--border); border-radius: 9px; }
.tree-container::-webkit-scrollbar-thumb:hover { background: #c0c5ce; }

/* ══════════════════════════════════════════════════════════════════════════════
   RESPONSIVO
══════════════════════════════════════════════════════════════════════════════ */
@media (max-width: 1024px) {
    .sidebar { width: 240px; min-width: 240px; }
    .topbar { padding: 0 .9rem; }
    .empty-state { padding: 1rem; }
}

/* ── TABLET / MOBILE (≤ 768px) ── */
@media (max-width: 768px) {

    .app-layout {
        display: flex;
        min-height: 100vh;
        overflow: hidden;
    }

    /* ── SIDEBAR: estado EXPANDIDO (padrão) ── */
    .sidebar {
        position: fixed;
        top: 0;
        left: 0;
        bottom: 0;
        width: 72vw;
        max-width: 280px;
        min-width: 0;
        z-index: 200;
        box-shadow: 2px 0 12px rgba(0,0,0,.25);
        border-right: 1px solid var(--border);
        transition: transform var(--transition), width var(--transition);
        transform: translateX(0);
        overflow-y: auto;
        overflow-x: hidden;
    }

    /* ── SIDEBAR: estado RETRAÍDO (.collapsed) ── */
    .sidebar.collapsed {
        transform: translateX(-100%);
        box-shadow: none;
    }

    /* ── OVERLAY: fundo escurecido quando sidebar está aberta ── */
    #sidebar-overlay {
        display: none;
        position: fixed;
        inset: 0;
        background: rgba(0,0,0,.45);
        z-index: 199;
        cursor: pointer;
    }
    #sidebar-overlay.active {
        display: block;
    }

    /* ── MAIN CONTENT: ocupa 100% (sidebar está fora do fluxo) ── */
    .main-content {
        width: 100%;
        flex: 1 1 100%;
        min-width: 0;
        position: relative;
        z-index: 1;
    }

    .topbar-menu-btn { display: flex; }
    .editor-wrapper { padding: .75rem; }
}

@media (max-width: 768px) {
    .sidebar.collapsed .sidebar-title,
    .sidebar.collapsed .user-name,
    .sidebar.collapsed .logout-btn,
    .sidebar.collapsed .tree-search,
    .sidebar.collapsed .btn-action span + *,
    .sidebar.collapsed .sidebar-user,
    .sidebar.collapsed .sidebar-actions,
    .sidebar.collapsed .tree-container {
        opacity: 0;
        pointer-events: none;
    }
}

@media (max-width: 480px) {
    .topbar { gap: .5rem; }
    .topbar-right { gap: .45rem; }
    .breadcrumb { font-size: .76rem; }
    .btn-action { font-size: .75rem; padding: .45rem .45rem; }
    .sidebar-user { padding: .75rem; }
    .editor-wrapper .ck-editor__editable { min-height: 280px; }
}