/* ==========================================================================
   SCTech • Portfólio de Desenvolvimento Web - Eduardo da Costa
   Tema: Visual Studio Code (Dark Modern)
   ========================================================================== */

:root {
    /* Paleta Oficial VS Code Dark */
    --vs-titlebar-bg: #323233;
    --vs-activity-bg: #181818;
    --vs-sidebar-bg: #252526;
    --vs-sidebar-header-bg: #212224;
    --vs-editor-bg: #1e1e1e;
    --vs-tabs-bg: #252526;
    --vs-tab-active-bg: #1e1e1e;
    --vs-tab-inactive-bg: #2d2d2d;
    --vs-tab-hover-bg: #333333;
    --vs-statusbar-bg: #007acc;
    --vs-border: #3e3e42;
    --vs-border-subtle: #2d2d2d;
    --vs-hover: rgba(255, 255, 255, 0.07);
    --vs-active-selection: #094771;
    
    /* Cores de Texto */
    --vs-text: #cccccc;
    --vs-text-bright: #ffffff;
    --vs-text-muted: #858585;
    --vs-accent-blue: #007acc;
    --vs-accent-blue-hover: #1f9cf0;
    
    /* Cores de Sintaxe (Syntax Highlighting) */
    --syntax-keyword: #c586c0; /* roxo */
    --syntax-func: #dcdcaa;    /* amarelo suave */
    --syntax-tag: #569cd6;     /* azul */
    --syntax-attr: #9cdcfe;    /* azul claro */
    --syntax-string: #ce9178;  /* salmão / laranja */
    --syntax-comment: #6a9955; /* verde */
    --syntax-number: #b5cea8;  /* verde claro */
    --syntax-css-prop: #9cdcfe;
    --syntax-css-val: #ce9178;

    /* Tipografia */
    --font-ui: "Segoe UI", -apple-system, BlinkMacSystemFont, Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-code: "Cascadia Code", "Fira Code", Consolas, Monaco, "Courier New", monospace;
}

/* Reset básico e tipografia */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html, body {
    height: 100%;
    width: 100%;
    overflow: hidden;
    background-color: var(--vs-editor-bg);
    color: var(--vs-text);
    font-family: var(--font-ui);
    font-size: 13px;
    -webkit-font-smoothing: antialiased;
}

/* Estrutura Principal em CSS Grid */
.app-layout {
    display: grid;
    grid-template-rows: 35px 1fr 24px;
    height: 100vh;
    width: 100vw;
    overflow: hidden;
}

/* ==========================================================================
   1. BARRA DE TÍTULO (VS Code Title Bar)
   ========================================================================== */
.titlebar {
    background-color: var(--vs-titlebar-bg);
    border-bottom: 1px solid var(--vs-border-subtle);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 10px;
    user-select: none;
    z-index: 100;
}

.titlebar-left {
    display: flex;
    align-items: center;
    gap: 12px;
}

.vscode-icon {
    flex-shrink: 0;
}

.titlebar-menu {
    display: flex;
    align-items: center;
    gap: 14px;
    font-size: 12px;
}

.menu-item {
    color: var(--vs-text);
    cursor: pointer;
    padding: 2px 6px;
    border-radius: 4px;
    transition: background 0.15s;
}

.menu-item:hover {
    background-color: var(--vs-hover);
    color: var(--vs-text-bright);
}

.titlebar-center {
    flex: 1;
    max-width: 540px;
    margin: 0 16px;
}

.command-palette-btn {
    width: 100%;
    background-color: #252526;
    border: 1px solid var(--vs-border);
    color: var(--vs-text);
    padding: 4px 12px;
    border-radius: 6px;
    font-size: 12px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
    transition: all 0.2s ease;
}

.command-palette-btn:hover {
    background-color: #2a2d2e;
    border-color: var(--vs-accent-blue);
    color: var(--vs-text-bright);
}

.command-palette-btn .kb-shortcut {
    font-size: 11px;
    background: #007acc;
    color: #fff;
    padding: 1px 6px;
    border-radius: 4px;
    font-weight: 600;
}

.titlebar-right {
    display: flex;
    align-items: center;
    gap: 12px;
}

.didactic-help-trigger {
    background: linear-gradient(135deg, #1f9cf0, #007acc);
    color: #ffffff;
    border: none;
    padding: 4px 10px;
    border-radius: 4px;
    font-size: 11px;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 4px;
    transition: filter 0.2s;
}

.didactic-help-trigger:hover {
    filter: brightness(1.15);
}

.window-controls {
    display: flex;
    align-items: center;
    gap: 14px;
    color: var(--vs-text-muted);
    font-size: 12px;
}

.win-btn {
    cursor: pointer;
    padding: 2px 4px;
}

.win-btn:hover {
    color: var(--vs-text-bright);
}

.win-close:hover {
    color: #f48771;
}

/* ==========================================================================
   2. CORPO PRINCIPAL (Activity Bar + Sidebar + Split Editor)
   ========================================================================== */
.main-body {
    display: flex;
    height: 100%;
    width: 100%;
    overflow: hidden;
}

/* ACTIVITY BAR */
.activity-bar {
    width: 48px;
    background-color: var(--vs-activity-bg);
    border-right: 1px solid var(--vs-border-subtle);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    align-items: center;
    padding: 8px 0;
    flex-shrink: 0;
    user-select: none;
}

.activity-top, .activity-bottom {
    display: flex;
    flex-direction: column;
    gap: 8px;
    width: 100%;
    align-items: center;
}

.activity-btn {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: none;
    color: var(--vs-text-muted);
    cursor: pointer;
    position: relative;
    transition: color 0.15s;
    text-decoration: none;
}

.activity-btn:hover {
    color: var(--vs-text-bright);
}

.activity-btn.active {
    color: var(--vs-text-bright);
}

.activity-btn.active::before {
    content: "";
    position: absolute;
    left: 0;
    top: 6px;
    bottom: 6px;
    width: 2px;
    background-color: var(--vs-text-bright);
}

/* SIDEBAR EXPLORER */
.sidebar {
    width: 290px;
    background-color: var(--vs-sidebar-bg);
    border-right: 1px solid var(--vs-border-subtle);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
    transition: width 0.2s ease;
    overflow: hidden;
}

.sidebar.collapsed {
    width: 0;
    border-right: none;
}

.sidebar-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 16px 8px;
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.8px;
    color: var(--vs-text);
    border-bottom: 1px solid var(--vs-border-subtle);
    user-select: none;
}

.sidebar-toggle-btn {
    background: transparent;
    border: none;
    color: var(--vs-text-muted);
    cursor: pointer;
    padding: 2px;
    border-radius: 3px;
    display: flex;
    align-items: center;
}

.sidebar-toggle-btn:hover {
    color: var(--vs-text-bright);
    background-color: var(--vs-hover);
}

/* Dica para Leigos */
.didactic-box {
    margin: 8px 12px;
    background: rgba(0, 122, 204, 0.12);
    border-left: 3px solid var(--vs-accent-blue);
    padding: 8px 10px;
    border-radius: 0 4px 4px 0;
    font-size: 11.5px;
    line-height: 1.4;
    color: #e0e0e0;
}

.didactic-box-header {
    display: flex;
    align-items: center;
    gap: 5px;
    margin-bottom: 4px;
    color: #70b7ff;
    font-size: 12px;
}

/* Campo de busca */
.search-box {
    padding: 0 12px 8px;
}

.search-box input {
    width: 100%;
    background-color: #3c3c3c;
    border: 1px solid var(--vs-border);
    color: var(--vs-text-bright);
    padding: 5px 8px;
    border-radius: 3px;
    font-size: 12px;
    font-family: inherit;
    outline: none;
}

.search-box input:focus {
    border-color: var(--vs-accent-blue);
}

/* Árvore de Exercícios */
.explorer-tree {
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
    padding: 4px 0 16px;
}

.explorer-tree::-webkit-scrollbar {
    width: 8px;
}

.explorer-tree::-webkit-scrollbar-thumb {
    background-color: rgba(255, 255, 255, 0.15);
    border-radius: 4px;
}

.tree-section {
    margin-bottom: 8px;
}

.tree-section-header {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    font-size: 11px;
    font-weight: 700;
    color: #b0b0b0;
    cursor: pointer;
    user-select: none;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.tree-section-header:hover {
    color: var(--vs-text-bright);
    background-color: var(--vs-hover);
}

.tree-chevron {
    transition: transform 0.2s ease;
    font-size: 10px;
    display: inline-block;
    width: 12px;
    text-align: center;
}

.tree-section.collapsed .tree-chevron {
    transform: rotate(-90deg);
}

.tree-section.collapsed .tree-items {
    display: none;
}

.tree-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 6px 12px 6px 26px;
    cursor: pointer;
    user-select: none;
    font-size: 12px;
    color: var(--vs-text);
    border-left: 2px solid transparent;
    transition: background 0.15s;
    text-decoration: none;
}

.tree-item:hover {
    background-color: var(--vs-hover);
    color: var(--vs-text-bright);
}

.tree-item.active {
    background-color: var(--vs-active-selection);
    color: #ffffff;
    border-left: 2px solid var(--vs-accent-blue);
}

.item-left {
    display: flex;
    align-items: center;
    gap: 7px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.item-icon {
    flex-shrink: 0;
    font-size: 14px;
}

.item-badge {
    font-size: 10px;
    padding: 1px 5px;
    border-radius: 3px;
    font-weight: 600;
    flex-shrink: 0;
}

.badge-html { background-color: rgba(227, 76, 38, 0.25); color: #e34c26; }
.badge-css { background-color: rgba(38, 77, 228, 0.25); color: #4b88ff; }
.badge-js { background-color: rgba(247, 223, 30, 0.25); color: #f7df1e; }
.badge-node { background-color: rgba(104, 160, 99, 0.25); color: #83cd29; }

/* ==========================================================================
   3. SPLIT EDITOR (Área Dividida: Editor + Preview)
   ========================================================================== */
.split-editor {
    flex: 1;
    display: grid;
    grid-template-columns: 1fr 1fr;
    height: 100%;
    min-height: 0;
    min-width: 0;
    overflow: hidden;
    background-color: var(--vs-editor-bg);
}

/* Painel de Código (Esquerda) e Preview (Direita) */
.editor-pane, .preview-pane {
    display: flex;
    flex-direction: column;
    height: 100%;
    min-height: 0;
    min-width: 0;
    overflow: hidden;
    position: relative;
}

.editor-pane {
    border-right: 1px solid var(--vs-border);
}

/* Banner Explicativo Superior nos Painéis (Acessibilidade para Leigos) */
.pane-banner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 4px 12px;
    user-select: none;
    flex-shrink: 0;
}

.pane-banner-code {
    background-color: #172430;
    border-bottom: 1px solid rgba(0, 122, 204, 0.3);
}

.pane-banner-preview {
    background-color: #1a2a1a;
    border-bottom: 1px solid rgba(76, 175, 80, 0.3);
}

.pane-banner-info {
    display: flex;
    align-items: center;
    gap: 8px;
    overflow: hidden;
}

.pane-badge {
    font-size: 10.5px;
    font-weight: 700;
    padding: 2px 7px;
    border-radius: 3px;
    letter-spacing: 0.4px;
    flex-shrink: 0;
}

.badge-code {
    background-color: #007acc;
    color: #ffffff;
}

.badge-preview {
    background-color: #2e7d32;
    color: #ffffff;
}

.pane-desc {
    font-size: 11.5px;
    color: #b0c4de;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.pane-banner-preview .pane-desc {
    color: #b7e1cd;
}

.editor-actions {
    display: flex;
    gap: 6px;
}

.action-btn {
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.12);
    color: #dcdcdc;
    padding: 2px 8px;
    border-radius: 3px;
    font-size: 11px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 4px;
    transition: all 0.15s;
}

.action-btn:hover {
    background: rgba(255, 255, 255, 0.16);
    color: #ffffff;
}

/* TABS BAR (Abas do Editor) */
.tabs-container {
    display: flex;
    background-color: var(--vs-tabs-bg);
    border-bottom: 1px solid var(--vs-border-subtle);
    overflow-x: auto;
    overflow-y: hidden;
    user-select: none;
    flex-shrink: 0;
}

.tabs-container::-webkit-scrollbar {
    height: 3px;
}

.tabs-container::-webkit-scrollbar-thumb {
    background-color: rgba(255, 255, 255, 0.2);
}

.editor-tab {
    display: flex;
    align-items: center;
    gap: 7px;
    padding: 8px 14px;
    background-color: var(--vs-tab-inactive-bg);
    color: var(--vs-text-muted);
    font-size: 12px;
    cursor: pointer;
    border-right: 1px solid var(--vs-border-subtle);
    border-top: 2px solid transparent;
    white-space: nowrap;
    transition: background 0.15s, color 0.15s;
}

.editor-tab:hover {
    background-color: var(--vs-tab-hover-bg);
    color: var(--vs-text);
}

.editor-tab.active {
    background-color: var(--vs-tab-active-bg);
    color: var(--vs-text-bright);
    border-top: 2px solid var(--vs-accent-blue);
    font-weight: 600;
}

.tab-icon {
    font-size: 13px;
    flex-shrink: 0;
}

.tab-close {
    font-size: 12px;
    color: var(--vs-text-muted);
    border-radius: 3px;
    padding: 0 2px;
    margin-left: 4px;
    opacity: 0.7;
}

.tab-close:hover {
    background-color: rgba(255, 255, 255, 0.15);
    color: var(--vs-text-bright);
}

/* BREADCRUMBS */
.breadcrumbs {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 4px 14px;
    font-size: 11px;
    color: var(--vs-text-muted);
    background-color: var(--vs-editor-bg);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    user-select: none;
    flex-shrink: 0;
}

.bc-sep {
    font-size: 9px;
    opacity: 0.6;
}

.bc-part.active-file {
    color: var(--vs-text);
    font-weight: 600;
}

/* ÁREA DE CÓDIGO COM LINHAS */
.code-wrapper {
    flex: 1;
    display: flex;
    min-height: 0;
    min-width: 0;
    background-color: var(--vs-editor-bg);
    overflow: auto;
    font-family: var(--font-code);
    font-size: 13px;
    line-height: 1.55;
    position: relative;
}

.code-wrapper::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

.code-wrapper::-webkit-scrollbar-thumb {
    background-color: rgba(255, 255, 255, 0.15);
    border-radius: 4px;
}

.line-numbers {
    padding: 10px 12px 10px 14px;
    text-align: right;
    color: #858585;
    user-select: none;
    border-right: 1px solid rgba(255, 255, 255, 0.07);
    font-size: 12.5px;
    background-color: #1e1e1e;
    min-width: 44px;
    flex-shrink: 0;
}

.code-display {
    flex: 1;
    min-width: 0;
    padding: 10px 16px;
    margin: 0;
    background-color: transparent;
    color: #d4d4d4;
    overflow-x: auto;
    white-space: pre;
    tab-size: 4;
}

.code-display.wrap-active {
    white-space: pre-wrap;
    word-break: break-word;
}

.code-display code {
    font-family: inherit;
    font-size: inherit;
    color: inherit;
    display: block;
    min-height: 100%;
}

/* Syntax Highlighting Classes */
.tok-comment { color: var(--syntax-comment); font-style: italic; }
.tok-keyword { color: var(--syntax-keyword); font-weight: 600; }
.tok-tag { color: var(--syntax-tag); }
.tok-attr { color: var(--syntax-attr); }
.tok-string { color: var(--syntax-string); }
.tok-func { color: var(--syntax-func); }
.tok-number { color: var(--syntax-number); }
.tok-operator { color: #d4d4d4; }
.tok-property { color: var(--syntax-css-prop); }

/* ==========================================================================
   4. PAINEL DE PREVIEW (Navegador Simulado)
   ========================================================================== */
.preview-viewport-controls {
    display: flex;
    gap: 4px;
}

.vp-btn {
    background: transparent;
    border: 1px solid rgba(255, 255, 255, 0.15);
    color: #e0e0e0;
    padding: 2px 6px;
    border-radius: 3px;
    cursor: pointer;
    font-size: 11px;
    transition: all 0.15s;
}

.vp-btn:hover {
    background: rgba(255, 255, 255, 0.1);
}

.vp-btn.active {
    background: #2e7d32;
    border-color: #4caf50;
    color: #ffffff;
}

/* BARRA DE ENDEREÇOS DO NAVEGADOR */
.browser-bar {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 6px 12px;
    background-color: #252526;
    border-bottom: 1px solid var(--vs-border);
    user-select: none;
    flex-shrink: 0;
}

.browser-btn {
    background: transparent;
    border: none;
    color: var(--vs-text-muted);
    cursor: pointer;
    padding: 3px 6px;
    border-radius: 3px;
    font-size: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.15s;
    text-decoration: none;
}

.browser-btn:hover {
    background-color: var(--vs-hover);
    color: var(--vs-text-bright);
}

.browser-address {
    flex: 1;
    background-color: #1e1e1e;
    border: 1px solid var(--vs-border);
    border-radius: 4px;
    padding: 4px 10px;
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 11.5px;
    color: #9cdcfe;
    overflow: hidden;
}

.lock-icon {
    font-size: 11px;
    color: #4ec9b0;
    flex-shrink: 0;
}

.url-text {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.ext-btn {
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid var(--vs-border);
    color: var(--vs-text-bright);
    font-size: 11px;
    gap: 4px;
    padding: 4px 8px;
}

.ext-btn:hover {
    background: rgba(255, 255, 255, 0.15);
    color: #ffffff;
}

/* IFRAME CONTAINER */
.preview-frame-container {
    flex: 1;
    width: 100%;
    height: 100%;
    background-color: #121212;
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
    overflow: auto;
    padding: 0;
}

#previewIframe {
    width: 100%;
    height: 100%;
    border: none;
    background-color: #ffffff;
    transition: width 0.3s ease, max-height 0.3s ease;
}

/* Responsividade do Preview (Modo Tablet e Celular) */
.preview-frame-container.viewport-tablet {
    padding: 20px 10px;
}

.preview-frame-container.viewport-tablet #previewIframe {
    width: 768px;
    max-height: 94%;
    border-radius: 8px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.7);
    border: 2px solid #333333;
}

.preview-frame-container.viewport-mobile {
    padding: 20px 10px;
}

.preview-frame-container.viewport-mobile #previewIframe {
    width: 375px;
    max-height: 94%;
    border-radius: 12px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.7);
    border: 3px solid #333333;
}

/* TERMINAL DE BACK-END (Fallback para Node.js) */
.backend-terminal-view {
    width: 100%;
    height: 100%;
    background-color: #181818;
    color: #cccccc;
    display: flex;
    flex-direction: column;
    font-family: var(--font-code);
}

.terminal-tabbar {
    display: flex;
    background-color: #252526;
    border-bottom: 1px solid var(--vs-border-subtle);
    padding: 0 8px;
}

.term-tab {
    padding: 6px 12px;
    font-size: 11px;
    color: var(--vs-text-muted);
    border-bottom: 2px solid transparent;
    cursor: pointer;
}

.term-tab.active {
    color: var(--vs-text-bright);
    border-bottom: 2px solid var(--vs-accent-blue);
    font-weight: 600;
}

.terminal-content {
    flex: 1;
    padding: 16px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.term-line {
    font-size: 13px;
}

.term-cmd {
    color: #4ec9b0;
    font-weight: 600;
}

.term-output {
    background: #0d0d0d;
    border: 1px solid #333333;
    padding: 12px 14px;
    border-radius: 4px;
    color: #dcdcdc;
    font-size: 12.5px;
    line-height: 1.6;
    white-space: pre-wrap;
}

.term-didactic-info {
    margin-top: 20px;
    background: rgba(0, 122, 204, 0.1);
    border: 1px solid rgba(0, 122, 204, 0.3);
    border-radius: 6px;
    padding: 14px;
    font-family: var(--font-ui);
}

.term-didactic-info h4 {
    color: #70b7ff;
    margin-bottom: 6px;
    font-size: 13px;
}

.term-didactic-info p {
    font-size: 12px;
    line-height: 1.5;
    color: #cccccc;
}

/* ==========================================================================
   5. BARRA DE STATUS INFERIOR (VS Code Status Bar)
   ========================================================================== */
.statusbar {
    background-color: var(--vs-statusbar-bg);
    color: #ffffff;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 10px;
    font-size: 11.5px;
    user-select: none;
    z-index: 100;
}

.status-left, .status-right {
    display: flex;
    align-items: center;
    gap: 14px;
}

.status-item {
    display: flex;
    align-items: center;
    gap: 5px;
    cursor: default;
}

.status-item.git-branch {
    cursor: pointer;
}

.status-project-active {
    font-weight: 600;
}

.credit {
    opacity: 0.9;
}

/* ==========================================================================
   6. MODAL DIDÁTICO / AJUDA PARA LEIGOS
   ========================================================================== */
.didactic-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(0, 0, 0, 0.75);
    border: none;
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    backdrop-filter: blur(4px);
}

.didactic-modal[open] {
    display: flex;
}

.modal-card {
    background-color: #252526;
    border: 1px solid var(--vs-border);
    border-radius: 8px;
    width: 90%;
    max-width: 620px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.6);
    overflow: hidden;
    animation: modalPop 0.25s ease-out;
}

@keyframes modalPop {
    from { opacity: 0; transform: scale(0.95); }
    to { opacity: 1; transform: scale(1); }
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 18px;
    background-color: #2d2d2d;
    border-bottom: 1px solid var(--vs-border-subtle);
}

.modal-title {
    display: flex;
    align-items: center;
    gap: 8px;
}

.modal-emoji {
    font-size: 20px;
}

.modal-title h3 {
    font-size: 14px;
    font-weight: 600;
    color: #ffffff;
}

.modal-close-btn {
    background: transparent;
    border: none;
    color: var(--vs-text-muted);
    font-size: 16px;
    cursor: pointer;
    padding: 2px 6px;
    border-radius: 4px;
}

.modal-close-btn:hover {
    color: #ffffff;
    background-color: var(--vs-hover);
}

.modal-body {
    padding: 18px 20px;
    display: flex;
    flex-direction: column;
    gap: 16px;
    max-height: 70vh;
    overflow-y: auto;
}

.intro-p {
    font-size: 13px;
    line-height: 1.5;
    color: #e0e0e0;
}

.didactic-features-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 10px;
}

.feature-item {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    background: rgba(255, 255, 255, 0.04);
    padding: 10px 12px;
    border-radius: 6px;
    border-left: 3px solid var(--vs-accent-blue);
}

.f-icon {
    font-size: 18px;
    line-height: 1;
}

.f-text strong {
    font-size: 12.5px;
    color: #ffffff;
    display: block;
    margin-bottom: 2px;
}

.f-text p {
    font-size: 12px;
    color: #cccccc;
    line-height: 1.4;
}

.glossary-section h4 {
    font-size: 13px;
    color: #ffffff;
    margin-bottom: 8px;
}

.glossary-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.glossary-list li {
    font-size: 12px;
    line-height: 1.4;
    color: #dcdcdc;
}

.pill {
    display: inline-block;
    padding: 1px 6px;
    border-radius: 3px;
    font-size: 10.5px;
    font-weight: 700;
    margin-right: 4px;
}

.pill-html { background-color: #e34c26; color: #fff; }
.pill-css { background-color: #264de4; color: #fff; }
.pill-js { background-color: #f7df1e; color: #000; }
.pill-node { background-color: #68a063; color: #fff; }

.modal-tip {
    background: rgba(247, 223, 30, 0.1);
    border: 1px solid rgba(247, 223, 30, 0.3);
    padding: 10px 12px;
    border-radius: 6px;
    font-size: 12px;
    color: #fff4a3;
    line-height: 1.4;
}

.modal-footer {
    padding: 12px 18px;
    background-color: #212224;
    border-top: 1px solid var(--vs-border-subtle);
    display: flex;
    justify-content: flex-end;
}

.modal-action-btn {
    background-color: var(--vs-accent-blue);
    color: #ffffff;
    border: none;
    padding: 7px 16px;
    border-radius: 4px;
    font-size: 12.5px;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.15s;
}

.modal-action-btn:hover {
    background-color: var(--vs-accent-blue-hover);
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

/* ==========================================================================
   7. RESPONSIVIDADE (CSS Grid & Flexbox)
   ========================================================================== */

/* Telas menores que 1024px: Split Editor empilhado (Cima / Baixo) */
@media (max-width: 1024px) {
    .split-editor {
        grid-template-columns: 1fr;
        grid-template-rows: 1fr 1fr;
    }

    .editor-pane {
        border-right: none;
        border-bottom: 2px solid var(--vs-border);
    }
}

/* Telas menores que 768px: Mobile / Celular */
@media (max-width: 768px) {
    .titlebar-menu {
        display: none;
    }

    .titlebar-center {
        margin: 0 8px;
    }

    .sidebar {
        position: absolute;
        left: 48px;
        top: 35px;
        bottom: 24px;
        z-index: 50;
        box-shadow: 4px 0 15px rgba(0, 0, 0, 0.5);
    }

    .sidebar.collapsed {
        display: none;
    }

    .status-item:not(.git-branch):not(.status-project-active) {
        display: none;
    }
}