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

/* ─── DESIGN TOKENS ──────────────────────────────────────────────────────── */
:root {
  --bg:      #0d1117;
  --surface: #161b22;
  --surface2: #1e2530;
  --border:  #30363d;
  --accent:  #00c8ff;
  --accent2: #7c3aed;
  --green:   #3fb950;
  --red:     #f85149;
  --yellow:  #e3b341;
  --text:    #e6edf3;
  --muted:   #8b949e;
  --radius:  8px;
}

/* ─── BASE ───────────────────────────────────────────────────────────────── */
html,
body {
  height: 100%;
  font-family: 'Inter', sans-serif;
  background: var(--bg);
  color: var(--text);
  overflow: hidden;
  hyphens: none;
  -webkit-hyphens: none;
}

/* ─── LAYOUT ─────────────────────────────────────────────────────────────── */
.app {
  display: grid;
  grid-template-columns: 280px 1fr;
  grid-template-rows: 56px 1fr;
  height: 100vh;
}

/* ─── TOPBAR ─────────────────────────────────────────────────────────────── */
.topbar {
  grid-column: 1 / -1;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 0 20px;
}

.topbar-logo {
  display: flex;
  align-items: center;
  gap: 10px;
}

.topbar-logo svg {
  width: 28px;
  height: 28px;
}

.topbar-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--text);
}

.topbar-title span {
  color: var(--accent);
}

.topbar-badge {
  margin-left: 8px;
  background: rgba(0, 200, 255, .12);
  color: var(--accent);
  font-size: 11px;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 20px;
  border: 1px solid rgba(0, 200, 255, .25);
}

.topbar-right {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 14px;
}

.pyodide-status {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  color: var(--muted);
}

.pyodide-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--yellow);
  transition: background .3s;
}

.pyodide-dot.ready { background: var(--green); }
.pyodide-dot.error { background: var(--red); }

.topbar-module {
  font-size: 12px;
  color: var(--muted);
  padding: 4px 12px;
  border-radius: 20px;
  border: 1px solid var(--border);
}

/* ─── SIDEBAR ────────────────────────────────────────────────────────────── */
.sidebar {
  background: var(--surface);
  border-right: 1px solid var(--border);
  overflow-y: auto;
  display: flex;
  flex-direction: column;
}

.sidebar::-webkit-scrollbar { width: 4px; }
.sidebar::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 4px;
}

.sidebar-section {
  padding: 16px 16px 8px;
}

.sidebar-section-label {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 8px;
}

/* ─── MODULE GROUPS ──────────────────────────────────────────────────────── */
.module-group {
  border-radius: 10px;
  margin-bottom: 10px;
  overflow: hidden;
  border: 1px solid var(--border);
}

.module-group-1 {
  border-color: rgba(0,200,255,.3);
}

.module-group-2 {
  border-color: rgba(0,200,255,.3);
  margin-top: 4px;
}

.module-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 9px 14px;
  cursor: pointer;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.8px;
  text-transform: uppercase;
  user-select: none;
  transition: filter .15s;
}

.module-group-1 .module-header,
.module-group-2 .module-header {
  background: rgba(0,200,255,.08);
  color: var(--accent);
}

.module-header:hover { filter: brightness(1.15); }

.module-chevron {
  font-size: 15px;
  line-height: 1;
  opacity: .7;
}

.module-group .lesson-item {
  border-radius: 0;
  border-left: none;
  border-right: none;
  border-top: none;
  border-bottom: 1px solid var(--border);
}

.module-group .lesson-item:last-child {
  border-bottom: none;
}

.lesson-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 12px;
  border-radius: var(--radius);
  cursor: pointer;
  transition: background .15s;
  margin-bottom: 2px;
}

.lesson-item:hover { background: var(--surface2); }

.lesson-item.active {
  background: rgba(0, 200, 255, .08);
  border: 1px solid rgba(0, 200, 255, .2);
}

.lesson-num {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  font-weight: 600;
  background: var(--surface2);
  color: var(--muted);
  flex-shrink: 0;
  border: 1px solid var(--border);
}

.lesson-item.done .lesson-num {
  background: rgba(63, 185, 80, .15);
  color: var(--green);
  border-color: rgba(63, 185, 80, .3);
}

.lesson-item.active .lesson-num {
  background: rgba(0, 200, 255, .15);
  color: var(--accent);
  border-color: rgba(0, 200, 255, .3);
}

.lesson-label {
  font-size: 13px;
  font-weight: 500;
  line-height: 1.3;
}

.lesson-tag {
  margin-left: auto;
  font-size: 10px;
  padding: 2px 7px;
  border-radius: 10px;
  font-weight: 600;
  flex-shrink: 0;
}

.tag-básico       { background: rgba(63, 185, 80, .12); color: var(--green); }
.tag-intermediário { background: rgba(0, 200, 255, .12); color: var(--accent); }
.tag-avançado     { background: rgba(124, 58, 237, .12); color: #a78bfa; }

.sidebar-progress {
  padding: 16px;
  margin-top: auto;
  border-top: 1px solid var(--border);
}

.progress-label {
  font-size: 12px;
  color: var(--muted);
  margin-bottom: 8px;
  display: flex;
  justify-content: space-between;
}

.progress-bar {
  height: 4px;
  background: var(--surface2);
  border-radius: 4px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  border-radius: 4px;
  transition: width .4s ease;
}

/* ─── MAIN ───────────────────────────────────────────────────────────────── */
.main {
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

/* Lesson header */
.lesson-header {
  padding: 24px 32px 20px;
  border-bottom: 1px solid var(--border);
  background: var(--surface);
}

.lesson-header-top {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 6px;
}

.lesson-header h2 {
  font-size: 20px;
  font-weight: 700;
}

.lesson-header p {
  font-size: 14px;
  color: var(--muted);
  line-height: 1.6;
  max-width: 720px;
}

/* Content area */
.content-area {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  padding: 28px 32px;
  gap: 24px;
}

.content-area::-webkit-scrollbar { width: 5px; }
.content-area::-webkit-scrollbar-track { background: transparent; }
.content-area::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 4px;
}

/* ─── CONTENT BLOCKS ─────────────────────────────────────────────────────── */
.theory-block {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 24px;
}

.theory-block h3 {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.theory-block p,
.theory-block li {
  font-size: 14px;
  color: #cdd9e5;
  line-height: 1.7;
  margin-bottom: 8px;
}

.theory-block ul,
.theory-block ol {
  padding-left: 20px;
}

.theory-block li { margin-bottom: 4px; }

.theory-block code {
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
  background: #0d1117;
  padding: 3px 10px;
  border-radius: 5px;
  color: var(--accent);
  border: 1px solid rgba(0,200,255,.18);
  display: inline-block;
}

.tip-block {
  background: rgba(0, 200, 255, .05);
  border: 1px solid rgba(0, 200, 255, .2);
  border-left: 3px solid var(--accent);
  border-radius: var(--radius);
  padding: 14px 18px;
}

.tip-block .tip-label {
  font-size: 11px;
  font-weight: 700;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: .5px;
  margin-bottom: 6px;
}

.tip-block p {
  font-size: 13px;
  color: #cdd9e5;
  line-height: 1.6;
  margin: 0;
}

.warning-block {
  background: rgba(227, 179, 65, .05);
  border: 1px solid rgba(227, 179, 65, .25);
  border-left: 3px solid var(--yellow);
  border-radius: var(--radius);
  padding: 14px 18px;
}

.warning-block .tip-label { color: var(--yellow); }

.warning-block p {
  font-size: 13px;
  color: #cdd9e5;
  line-height: 1.6;
  margin: 0;
}

.practice-block {
  background: rgba(124, 58, 237, .07);
  border: 1px solid rgba(124, 58, 237, .3);
  border-left: 3px solid var(--accent2);
  border-radius: var(--radius);
  padding: 14px 18px;
}
.practice-block .tip-label { color: var(--accent2); }
.practice-block p { font-size: 13px; color: #cdd9e5; line-height: 1.6; margin: 0; }

.exercises-block {
  background: rgba(56, 189, 101, .06);
  border: 1px solid rgba(56, 189, 101, .25);
  border-left: 3px solid #38bd65;
  border-radius: var(--radius);
  padding: 14px 18px;
}
.exercises-block .tip-label { color: #38bd65; }
.exercises-block p { font-size: 13px; color: #cdd9e5; line-height: 1.6; margin: 0; }

/* ─── IDE BLOCK ──────────────────────────────────────────────────────────── */
.ide-block {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}

.ide-toolbar {
  background: var(--surface2);
  border-bottom: 1px solid var(--border);
  padding: 10px 16px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.ide-toolbar-dots {
  display: flex;
  gap: 6px;
}

.ide-toolbar-dots span {
  width: 12px;
  height: 12px;
  border-radius: 50%;
}

.dot-red    { background: #ff5f57; }
.dot-yellow { background: #febc2e; }
.dot-green  { background: #28c840; }

.ide-filename {
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  color: var(--muted);
  margin-left: 4px;
}

.ide-actions {
  margin-left: auto;
  display: flex;
  gap: 8px;
}

.btn-run {
  display: flex;
  align-items: center;
  gap: 6px;
  background: var(--accent);
  color: #000;
  font-size: 12px;
  font-weight: 700;
  padding: 6px 14px;
  border-radius: 6px;
  border: none;
  cursor: pointer;
  transition: opacity .15s;
}

.btn-run:hover       { opacity: .85; }
.btn-run:disabled    { opacity: .5; cursor: not-allowed; }

.btn-clear {
  display: flex;
  align-items: center;
  gap: 6px;
  background: transparent;
  color: var(--muted);
  font-size: 12px;
  font-weight: 600;
  padding: 6px 12px;
  border-radius: 6px;
  border: 1px solid var(--border);
  cursor: pointer;
  transition: all .15s;
}

.btn-clear:hover {
  color: var(--text);
  border-color: var(--text);
}

.code-editor-wrap { position: relative; }

.code-editor {
  font-family: 'JetBrains Mono', monospace;
  font-size: 14px;
  line-height: 1.6;
  background: #0d1117;
  color: var(--text);
  padding: 16px;
  border: none;
  outline: none;
  resize: none;
  width: 100%;
  min-height: 160px;
  tab-size: 4;
  -moz-tab-size: 4;
}

/* ─── OUTPUT ─────────────────────────────────────────────────────────────── */
.output-section { border-top: 1px solid var(--border); }

.output-header {
  background: var(--surface2);
  padding: 8px 16px;
  font-size: 11px;
  font-weight: 700;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: .5px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.output-status {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--muted);
}

.output-status.ok  { background: var(--green); }
.output-status.err { background: var(--red); }

.output-body {
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
  line-height: 1.7;
  padding: 12px 16px;
  min-height: 56px;
  color: #cdd9e5;
  white-space: pre-wrap;
  word-break: break-word;
}

.output-body.error    { color: var(--red); }
.output-body .success-line { color: var(--green); }
.output-idle { color: var(--muted); font-style: italic; }

/* ─── BOTTOM NAV ─────────────────────────────────────────────────────────── */
.lesson-nav {
  border-top: 1px solid var(--border);
  background: var(--surface);
  padding: 14px 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.btn-nav {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--surface2);
  color: var(--text);
  font-size: 13px;
  font-weight: 600;
  padding: 8px 18px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  cursor: pointer;
  transition: all .15s;
}

.btn-nav:hover:not(:disabled) {
  border-color: var(--accent);
  color: var(--accent);
}

.btn-nav:disabled { opacity: .3; cursor: not-allowed; }

.btn-complete {
  background: rgba(63, 185, 80, .15);
  color: var(--green);
  border-color: rgba(63, 185, 80, .3);
  font-size: 13px;
  font-weight: 600;
  padding: 8px 18px;
  border-radius: var(--radius);
  border: 1px solid;
  cursor: pointer;
  transition: all .15s;
  display: flex;
  align-items: center;
  gap: 6px;
}

.btn-complete:hover   { background: rgba(63, 185, 80, .25); }
.btn-complete.done    { background: rgba(63, 185, 80, .25); }

/* ─── TAG AULA 0 ─────────────────────────────────────────────────────────── */
.tag-inicio     { background: rgba(251,146,60,.12); color: #fb923c; }
.tag-exercicios { background: rgba(124,58,237,.15); color: #a78bfa; }

@keyframes pulse-exercises {
  0%, 100% { background: transparent; box-shadow: none; }
  50%       { background: rgba(124,58,237,.1); box-shadow: inset 0 0 0 1px rgba(167,139,250,.35); }
}

.lesson-item-exercises {
  animation: pulse-exercises 1.8s ease-in-out infinite;
}

/* ─── ARTICLE WRAPPER (renderizado dentro do content-area) ───────────────── */
.article-wrapper { display: flex; flex-direction: column; gap: 20px; }

.art-eyebrow {
  display: inline-flex; align-items: center;
  font-size: 11px; font-weight: 700; letter-spacing: 1px;
  text-transform: uppercase; color: var(--accent);
  background: rgba(0,200,255,.08); border: 1px solid rgba(0,200,255,.2);
  padding: 4px 12px; border-radius: 20px;
  width: fit-content;
}

.art-title {
  font-size: 22px; font-weight: 800;
  line-height: 1.3; letter-spacing: -.4px;
  color: var(--text);
}

.art-lead {
  font-size: 15px; color: var(--muted);
  line-height: 1.75;
  padding-bottom: 20px; border-bottom: 1px solid var(--border);
}

.art-install-list {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 22px;
}
.art-install-title { font-size: 14px; font-weight: 700; margin-bottom: 12px; }
.art-install-list ul { list-style: none; display: flex; flex-direction: column; gap: 7px; }
.art-install-list li { font-size: 14px; color: #cdd9e5; }

.art-section-head {
  display: flex; align-items: center; gap: 10px;
  font-size: 18px; font-weight: 700;
  color: var(--text); margin-top: 8px;
  padding-top: 20px; border-top: 1px solid var(--border);
}
.art-pin { font-size: 18px; }

.art-p { font-size: 14px; color: #cdd9e5; line-height: 1.8; }
.art-p code, .art-callout code, .article-wrapper code {
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
  background: #0d1117;
  padding: 3px 10px;
  border-radius: 5px;
  color: var(--accent);
  border: 1px solid rgba(0,200,255,.18);
  display: inline-block;
}
.art-p strong { color: var(--text); }
.art-p a { color: var(--accent); text-decoration: none; border-bottom: 1px solid rgba(0,200,255,.3); }
.art-p a:hover { border-color: var(--accent); }

.art-callout {
  display: flex; gap: 10px;
  padding: 13px 16px; border-radius: var(--radius);
  font-size: 14px; color: #cdd9e5; line-height: 1.7;
}
.art-callout strong { color: var(--text); }
.art-callout a { color: var(--accent); font-weight: 600; text-decoration: none; }
.art-callout-info {
  background: rgba(0,200,255,.05);
  border: 1px solid rgba(0,200,255,.2);
  border-left: 3px solid var(--accent);
}
.art-callout-warn {
  background: rgba(227,179,65,.05);
  border: 1px solid rgba(227,179,65,.25);
  border-left: 3px solid var(--yellow);
}

.art-callout-dl {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
}
.art-dl-btn {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 7px 16px;
  background: rgba(0,200,255,.1);
  border: 1px solid rgba(0,200,255,.35);
  border-radius: 8px;
  color: var(--accent);
  font-family: 'Inter', sans-serif;
  font-size: 13px;
  font-weight: 600;
  text-decoration: none;
  white-space: nowrap;
  transition: background .15s, border-color .15s, box-shadow .15s;
}
.art-dl-btn:hover {
  background: rgba(0,200,255,.18);
  border-color: rgba(0,200,255,.6);
  box-shadow: 0 0 10px rgba(0,200,255,.15);
}

.art-code-block {
  background: #0d1117;
  border: 1px solid var(--border);
  border-radius: var(--radius);
}
.art-code-block pre {
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px; color: var(--accent);
  padding: 14px 16px; line-height: 1.7;
}

.art-img-block { margin: 16px 0; }
.code-err { color: #f85149; }
.code-ok  { color: #56d364; }
.code-warn { color: #e3b341; }

.type-heading {
  display: inline-block;
  font-size: 15px;
  font-weight: 700;
  color: var(--accent);
  background: rgba(0,200,255,.08);
  border: 1px solid rgba(0,200,255,.2);
  border-radius: 6px;
  padding: 5px 14px;
  margin-bottom: 10px;
}

.art-img-placeholder {
  background: var(--surface);
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 28px; text-align: center;
  transition: border-color .2s;
}
.art-img-placeholder:hover { border-color: rgba(0,200,255,.3); }
.art-img-icon { font-size: 26px; margin-bottom: 8px; }
.art-img-label { font-size: 12px; font-weight: 600; color: var(--muted); }

.art-img-real {
  max-width: 640px;
  width: 100%;
  height: auto;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  display: block;
  margin: 0 auto;
}

.art-ext-grid {
  display: grid; grid-template-columns: 1fr 1fr;
  gap: 12px;
}
.art-ext-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 16px;
}
.art-ext-name { font-size: 13px; font-weight: 700; margin-bottom: 5px; }
.art-ext-desc { font-size: 12px; color: var(--muted); line-height: 1.5; }

.art-conclusion {
  background: linear-gradient(135deg, rgba(0,200,255,.06), rgba(124,58,237,.06));
  border: 1px solid rgba(0,200,255,.2);
  border-radius: 12px;
  padding: 28px;
  margin-top: 8px;
}
.art-conclusion h3 { font-size: 17px; font-weight: 800; margin-bottom: 14px; }
.art-conclusion p { font-size: 14px; color: #cdd9e5; line-height: 1.8; margin-bottom: 10px; }
.art-conclusion p:last-child { margin-bottom: 0; }
.art-conclusion-cta { color: var(--accent) !important; font-weight: 700 !important; }

/* ─── LOADING OVERLAY ────────────────────────────────────────────────────── */
.loading-overlay {
  position: fixed;
  inset: 0;
  z-index: 999;
  background: var(--bg);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 20px;
  transition: opacity .5s;
}

.loading-overlay.hidden {
  opacity: 0;
  pointer-events: none;
}

.loading-logo {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  font-size: 42px;
  font-weight: 800;
  color: var(--accent);
  letter-spacing: -1px;
  line-height: 1;
}

.loading-logo span { color: var(--text); }

.loading-spinner {
  width: 36px;
  height: 36px;
  border: 3px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

.loading-msg {
  font-size: 13px;
  color: var(--muted);
}

@keyframes spin {
  to { transform: rotate(360deg); }
}