/* ===== Reset ===== */
*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  background: var(--bg);
  color: var(--fg);
  -webkit-font-smoothing: antialiased;
  transition: background var(--transition), color var(--transition);
}

/* ===== Scrollbars suaves (segue o tema via --border-strong/--fg-subtle) ===== */
/* Firefox */
* { scrollbar-width: thin; scrollbar-color: var(--border-strong) transparent; }
/* Webkit (Chrome/Edge/Safari) */
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb {
  background: var(--border-strong);
  border-radius: var(--radius-full);
  border: 2px solid transparent;
  background-clip: padding-box;
  transition: background var(--transition);
}
::-webkit-scrollbar-thumb:hover { background: var(--fg-subtle); background-clip: padding-box; }
::-webkit-scrollbar-corner { background: transparent; }

/* ===== Typography ===== */
h1, h2, h3, h4 { margin: 0; font-weight: var(--weight-semibold); line-height: var(--leading-tight); letter-spacing: -0.01em; }
h1 { font-size: var(--text-4xl); letter-spacing: -0.02em; }
h2 { font-size: var(--text-3xl); }
h3 { font-size: var(--text-2xl); }
h4 { font-size: var(--text-xl); }
p { margin: 0; }
.subtitle { color: var(--fg-muted); font-size: var(--text-base); }
.label { font-size: var(--text-xs); font-weight: var(--weight-semibold); text-transform: uppercase; letter-spacing: 0.05em; color: var(--fg-muted); }
.caption { font-size: var(--text-xs); color: var(--fg-muted); }
.lead { font-size: var(--text-lg); color: var(--fg-muted); line-height: var(--leading-loose); }
.mono { font-family: var(--font-mono); font-size: var(--text-sm); }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ===== Buttons ===== */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: var(--space-2);
  font-family: inherit; font-weight: var(--weight-medium);
  border: 1px solid transparent;
  border-radius: var(--radius);
  cursor: pointer;
  transition: background var(--transition), border-color var(--transition), color var(--transition), transform var(--transition), box-shadow var(--transition);
  text-decoration: none; white-space: nowrap; user-select: none;
}
.btn:focus-visible { outline: 3px solid var(--ring); outline-offset: 2px; }
.btn:disabled, .btn[aria-disabled="true"] { opacity: .5; cursor: not-allowed; pointer-events: none; }
.btn:active:not(:disabled) { transform: translateY(1px); }
.btn-sm { padding: var(--space-1) var(--space-3); font-size: var(--text-sm); height: 32px; }
.btn-md { padding: var(--space-2) var(--space-4); font-size: var(--text-base); height: 40px; }
.btn-lg { padding: var(--space-3) var(--space-6); font-size: var(--text-lg); height: 48px; }
.btn-primary { background: var(--accent); color: var(--accent-fg); }
.btn-primary:hover:not(:disabled) { background: var(--accent-hover); box-shadow: var(--shadow-md); }
.btn-secondary { background: var(--bg-muted); color: var(--fg); border-color: var(--border); }
.btn-secondary:hover:not(:disabled) { background: var(--bg-elevated); border-color: var(--border-strong); }
.btn-ghost { background: transparent; color: var(--fg); }
.btn-ghost:hover:not(:disabled) { background: var(--bg-muted); }
.btn-danger { background: var(--danger); color: #fff; }
.btn-danger:hover:not(:disabled) { filter: brightness(.9); }
.btn-success { background: var(--success); color: #fff; }
.btn-success:hover:not(:disabled) { filter: brightness(.9); }
.btn-glass { background: var(--glass-bg); backdrop-filter: blur(var(--glass-blur)); -webkit-backdrop-filter: blur(var(--glass-blur)); border-color: var(--glass-border); color: var(--fg); }
.btn-block { width: 100%; }
.btn-icon { padding: 0; width: 40px; }
.btn-icon.btn-sm { width: 32px; }
.btn-icon.btn-lg { width: 48px; }
/* Estado "ligado" pros toggles de tema: bg do accent + ícone branco */
.theme-toggle-btn[aria-pressed="true"] { background: var(--accent); color: var(--accent-fg); }
.theme-toggle-btn[aria-pressed="true"]:hover { background: var(--accent-hover); color: var(--accent-fg); }
.theme-toggle-btn[aria-pressed="false"] { opacity: .75; }
.theme-toggle-btn[aria-pressed="false"]:hover { opacity: 1; }
.btn-loading { position: relative; pointer-events: none; }
.btn-loading > * { opacity: 0; }
.btn-loading::after {
  content: ""; position: absolute; top: 50%; left: 50%; margin: -8px 0 0 -8px;
  width: 16px; height: 16px;
  border: 2px solid currentColor; border-top-color: transparent;
  border-radius: 50%;
  animation: spin 600ms linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ===== Inputs ===== */
.input, .textarea, .select {
  font-family: inherit; font-size: var(--text-base); line-height: var(--leading-normal);
  color: var(--fg); background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: var(--space-2) var(--space-3); width: 100%;
  transition: border-color var(--transition), box-shadow var(--transition);
}
.input:focus, .textarea:focus, .select:focus {
  outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px var(--ring);
}
.input[aria-invalid="true"], .textarea[aria-invalid="true"], .select[aria-invalid="true"] { border-color: var(--danger); }
.input:disabled, .textarea:disabled, .select:disabled { background: var(--bg-muted); cursor: not-allowed; opacity: .7; }
.textarea { min-height: 96px; resize: vertical; }
.field { display: flex; flex-direction: column; gap: var(--space-2); }
.field-label { font-size: var(--text-sm); font-weight: var(--weight-medium); }
.field-helper { font-size: var(--text-xs); color: var(--fg-muted); }
.field-error { font-size: var(--text-xs); color: var(--danger); }
.checkbox, .radio { width: 18px; height: 18px; accent-color: var(--accent); }
.switch { position: relative; display: inline-block; width: 44px; height: 24px; }
.switch input { opacity: 0; width: 0; height: 0; }
.switch-slider { position: absolute; cursor: pointer; inset: 0; background: var(--bg-muted); border-radius: var(--radius-full); transition: var(--transition); }
.switch-slider::before { content: ""; position: absolute; top: 3px; left: 3px; width: 18px; height: 18px; background: white; border-radius: 50%; transition: var(--transition); }
.switch input:checked + .switch-slider { background: var(--accent); }
.switch input:checked + .switch-slider::before { transform: translateX(20px); }

/* ===== Cards ===== */
.card { background: var(--bg-elevated); border: 1px solid var(--border); border-radius: var(--radius-lg); overflow: hidden; transition: box-shadow var(--transition), transform var(--transition); }
.card-elevated { box-shadow: var(--shadow-md); }
.card-glass { background: var(--glass-bg); backdrop-filter: blur(var(--glass-blur)); -webkit-backdrop-filter: blur(var(--glass-blur)); border-color: var(--glass-border); }
.card-clickable { cursor: pointer; }
.card-clickable:hover { transform: translateY(-2px); box-shadow: var(--shadow-lg); }
.card-header { padding: var(--space-4) var(--space-6); border-bottom: 1px solid var(--border); }
.card-body { padding: var(--space-6); }
.card-footer { padding: var(--space-4) var(--space-6); border-top: 1px solid var(--border); background: var(--bg-muted); }

/* ===== Modal & overlay ===== */
.modal-backdrop { position: fixed; inset: 0; z-index: var(--z-modal); background: rgba(0,0,0,.5); backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px); display: flex; align-items: center; justify-content: center; padding: var(--space-4); }
.modal { background: var(--bg-elevated); border-radius: var(--radius-lg); box-shadow: var(--shadow-xl); max-width: 32rem; width: 100%; max-height: 90vh; overflow: auto; }
.modal-glass { background: var(--glass-bg); backdrop-filter: blur(var(--glass-blur)); border: 1px solid var(--glass-border); }
.overlay-glass { position: fixed; inset: 0; z-index: var(--z-modal); background: var(--glass-bg); backdrop-filter: blur(var(--glass-blur)); -webkit-backdrop-filter: blur(var(--glass-blur)); }
.drawer { position: fixed; top: 0; bottom: 0; right: 0; width: 320px; max-width: 90vw; background: var(--bg-elevated); box-shadow: var(--shadow-xl); z-index: var(--z-modal); transform: translateX(100%); transition: transform var(--transition); }
.drawer[data-open="true"] { transform: translateX(0); }

/* ===== Badges & chips ===== */
.badge { display: inline-flex; align-items: center; gap: var(--space-1); padding: var(--space-1) var(--space-2); font-size: var(--text-xs); font-weight: var(--weight-medium); border-radius: var(--radius-full); background: var(--bg-muted); color: var(--fg); }
.badge-success { background: var(--success-bg); color: var(--success); }
.badge-warning { background: var(--warning-bg); color: var(--warning); }
.badge-danger { background: var(--danger-bg); color: var(--danger); }
.badge-info { background: var(--info-bg); color: var(--info); }
.badge-neutral { background: var(--bg-muted); color: var(--fg-muted); }
.chip { display: inline-flex; align-items: center; gap: var(--space-1); padding: var(--space-1) var(--space-3); border-radius: var(--radius-full); background: var(--bg-muted); border: 1px solid var(--border); font-size: var(--text-sm); }

/* ===== Alerts & toasts ===== */
.alert { padding: var(--space-3) var(--space-4); border-radius: var(--radius); border: 1px solid var(--border); display: flex; gap: var(--space-3); align-items: flex-start; }
.alert-success { background: var(--success-bg); color: var(--success); border-color: transparent; }
.alert-warning { background: var(--warning-bg); color: var(--warning); border-color: transparent; }
.alert-error { background: var(--danger-bg); color: var(--danger); border-color: transparent; }
.alert-info { background: var(--info-bg); color: var(--info); border-color: transparent; }
.toast-container { position: fixed; bottom: var(--space-6); right: var(--space-6); z-index: var(--z-toast); display: flex; flex-direction: column; gap: var(--space-2); pointer-events: none; }
.toast { pointer-events: auto; min-width: 280px; max-width: 400px; padding: var(--space-3) var(--space-4); background: var(--bg-elevated); border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow-lg); display: flex; gap: var(--space-3); align-items: center; animation: toastIn 200ms ease-out; }
.toast-success { border-left: 4px solid var(--success); }
.toast-error { border-left: 4px solid var(--danger); }
.toast-info { border-left: 4px solid var(--info); }
@keyframes toastIn { from { transform: translateX(20px); opacity: 0; } to { transform: translateX(0); opacity: 1; } }

/* ===== Progress, spinner, skeleton ===== */
.progress { width: 100%; height: 8px; background: var(--bg-muted); border-radius: var(--radius-full); overflow: hidden; }
.progress-bar { height: 100%; background: var(--accent); transition: width var(--transition-slow); border-radius: inherit; }
.spinner { display: inline-block; width: 1em; height: 1em; border: 2px solid currentColor; border-top-color: transparent; border-radius: 50%; animation: spin 600ms linear infinite; }
.skeleton { background: linear-gradient(90deg, var(--bg-muted) 0%, var(--bg-elevated) 50%, var(--bg-muted) 100%); background-size: 200% 100%; animation: skeletonShimmer 1.5s ease-in-out infinite; border-radius: var(--radius-sm); }
@keyframes skeletonShimmer { 0% { background-position: 200% 0; } 100% { background-position: -200% 0; } }

/* ===== Drop zone ===== */
.dropzone { border: 2px dashed var(--border-strong); border-radius: var(--radius-lg); padding: var(--space-8); text-align: center; background: var(--bg-muted); cursor: pointer; transition: border-color var(--transition), background var(--transition); }
.dropzone:hover, .dropzone-active { border-color: var(--accent); background: var(--bg-elevated); }
.dropzone-icon { width: 48px; height: 48px; margin: 0 auto var(--space-3); color: var(--fg-muted); }
.file-list { margin-top: var(--space-4); display: flex; flex-direction: column; gap: var(--space-2); }
.file-item { display: flex; align-items: center; gap: var(--space-3); padding: var(--space-2) var(--space-3); background: var(--bg-elevated); border: 1px solid var(--border); border-radius: var(--radius); }
.file-item-icon { width: 18px; height: 18px; flex-shrink: 0; color: var(--fg-muted); }
.file-item a { color: var(--fg); text-decoration: none; font-size: var(--text-sm); }
.file-item a:hover { color: var(--accent); }

/* ===== Empty state ===== */
.empty-state { text-align: center; padding: var(--space-12) var(--space-4); color: var(--fg-muted); }
.empty-state-icon { width: 64px; height: 64px; margin: 0 auto var(--space-4); }

/* ===== Tables, lists, pagination, tabs, breadcrumb ===== */
.table { width: 100%; border-collapse: collapse; }
.table th, .table td { padding: var(--space-3) var(--space-4); text-align: left; border-bottom: 1px solid var(--border); }
.table th { font-weight: var(--weight-semibold); color: var(--fg-muted); font-size: var(--text-sm); }
.table tbody tr:hover { background: var(--bg-muted); }
.list { display: flex; flex-direction: column; gap: var(--space-1); }
.list-item { display: flex; align-items: center; gap: var(--space-3); padding: var(--space-3) var(--space-4); border-radius: var(--radius); cursor: pointer; transition: background var(--transition); }
.list-item:hover { background: var(--bg-muted); }
.list-item[aria-current="true"] { background: var(--accent); color: var(--accent-fg); }
.pagination { display: flex; gap: var(--space-1); align-items: center; }
.pagination a, .pagination span { padding: var(--space-2) var(--space-3); border-radius: var(--radius); font-size: var(--text-sm); text-decoration: none; color: var(--fg); }
.pagination a:hover { background: var(--bg-muted); }
.pagination [aria-current="true"] { background: var(--accent); color: var(--accent-fg); }
.tabs { display: flex; gap: var(--space-1); border-bottom: 1px solid var(--border); }
.tab { padding: var(--space-3) var(--space-4); cursor: pointer; color: var(--fg-muted); border-bottom: 2px solid transparent; transition: var(--transition); }
.tab[aria-selected="true"] { color: var(--fg); border-bottom-color: var(--accent); }
.breadcrumb { display: flex; gap: var(--space-2); align-items: center; font-size: var(--text-sm); color: var(--fg-muted); }
.breadcrumb-sep { color: var(--fg-subtle); }

/* ===== Header ===== */
.app-header { position: sticky; top: 0; z-index: var(--z-dropdown); display: flex; align-items: center; justify-content: space-between; padding: var(--space-3) var(--space-6); background: var(--glass-bg); backdrop-filter: blur(var(--glass-blur)); -webkit-backdrop-filter: blur(var(--glass-blur)); border-bottom: 1px solid var(--border); }
.app-logo { display: inline-flex; align-items: center; gap: var(--space-2); }
.app-logo-img { height: 32px; width: auto; max-width: 160px; object-fit: contain; display: block; }
@media (max-width: 640px) {
  .app-logo-img { height: 26px; max-width: 120px; }
}

/* ===== Composite ===== */
.lesson-card { display: flex; flex-direction: column; gap: var(--space-3); padding: var(--space-4); }
.lesson-card-cover { aspect-ratio: 16/9; background: var(--bg-muted); border-radius: var(--radius); }
.module-item { font-weight: var(--weight-semibold); padding: var(--space-2) var(--space-3); }
.chapter-item { font-size: var(--text-sm); color: var(--fg-muted); padding: var(--space-1) var(--space-3) var(--space-1) var(--space-6); }
.lesson-row { display: flex; align-items: center; gap: var(--space-2); padding: var(--space-2) var(--space-3) var(--space-2) var(--space-8); border-radius: var(--radius); cursor: pointer; transition: background var(--transition); font-size: var(--text-sm); }
.lesson-row:hover { background: var(--bg-muted); }
.lesson-row[aria-current="true"] { background: var(--accent); color: var(--accent-fg); }
.player-stage { background: #000; border-radius: var(--radius-lg); aspect-ratio: 16/9; position: relative; }
@media (max-width: 1023px) {
  .player-stage { position: fixed; inset: 0; backdrop-filter: blur(var(--glass-blur)); -webkit-backdrop-filter: blur(var(--glass-blur)); background: rgba(0,0,0,.4); z-index: var(--z-modal); display: flex; align-items: center; justify-content: center; border-radius: 0; aspect-ratio: auto; }
  .player-stage[data-collapsed="true"] { display: none; }
}

/* ===== Utilities ===== */
.row { display: flex; flex-direction: row; }
.col { display: flex; flex-direction: column; }
.stack-1 { display: flex; flex-direction: column; gap: var(--space-1); }
.stack-2 { display: flex; flex-direction: column; gap: var(--space-2); }
.stack-3 { display: flex; flex-direction: column; gap: var(--space-3); }
.stack-4 { display: flex; flex-direction: column; gap: var(--space-4); }
.stack-5 { display: flex; flex-direction: column; gap: var(--space-5); }
.stack-6 { display: flex; flex-direction: column; gap: var(--space-6); }
.gap-1 { gap: var(--space-1); } .gap-2 { gap: var(--space-2); } .gap-3 { gap: var(--space-3); } .gap-4 { gap: var(--space-4); } .gap-6 { gap: var(--space-6); }
.center { display: flex; align-items: center; justify-content: center; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.flex-1 { flex: 1; }
.text-center { text-align: center; }
.text-muted { color: var(--fg-muted); }
.hidden { display: none !important; }
@media (max-width: 1023px) { .hidden-mobile { display: none !important; } }
@media (min-width: 1024px) { .hidden-desktop { display: none !important; } }
.mt-1 { margin-top: var(--space-1); } .mt-2 { margin-top: var(--space-2); } .mt-3 { margin-top: var(--space-3); }
.mt-4 { margin-top: var(--space-4); } .mt-5 { margin-top: var(--space-5); } .mt-6 { margin-top: var(--space-6); }
.p-4 { padding: var(--space-4); } .p-6 { padding: var(--space-6); }

/* ===== Admin shell ===== */
.admin-shell { display: grid; grid-template-columns: 240px 1fr; min-height: calc(100vh - 56px); }
.admin-sidebar { background: var(--bg-elevated); border-right: 1px solid var(--border); padding: var(--space-4); display: flex; flex-direction: column; gap: var(--space-1); }
.admin-nav-link { display: flex; align-items: center; gap: var(--space-2); padding: var(--space-2) var(--space-3); border-radius: var(--radius); color: var(--fg); text-decoration: none; font-size: var(--text-sm); }
.admin-nav-link:hover { background: var(--bg-muted); text-decoration: none; }
.admin-nav-link[aria-current="true"] { background: var(--accent); color: var(--accent-fg); }
.admin-main { padding: var(--space-6); overflow-x: hidden; display: flex; flex-direction: column; }
.admin-footer { margin-top: auto; padding-top: var(--space-6); text-align: right; opacity: .55; }
.stats-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: var(--space-4); margin-top: var(--space-6); }
@media (max-width: 768px) {
  .admin-shell { grid-template-columns: 1fr; }
  .admin-sidebar { position: fixed; top: 56px; left: 0; bottom: 0; width: 240px; transform: translateX(-100%); transition: transform var(--transition); z-index: var(--z-modal); }
  .admin-sidebar[data-open="true"] { transform: translateX(0); }
}

/* ===== Course shell ===== */
.course-shell { display: grid; grid-template-columns: 1fr 320px; gap: var(--space-6); padding: var(--space-6); max-width: 1400px; margin: 0 auto; min-height: calc(100vh - 56px); }
.course-sidebar { background: var(--bg-elevated); border-radius: var(--radius-lg); padding: var(--space-4); overflow-y: auto; max-height: calc(100vh - 88px); position: sticky; top: 72px; }
.course-main { min-width: 0; }
.lesson-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: var(--space-4); }
.lesson-materials { background: var(--bg-elevated); border-radius: var(--radius-lg); padding: var(--space-5); margin-top: var(--space-6); }
.lesson-materials h3 { margin-bottom: var(--space-3); }
.lesson-materials .rich-content { line-height: var(--leading-loose); }
.lesson-materials .rich-content p { margin-bottom: var(--space-3); }
@media (max-width: 1023px) {
  .course-shell { grid-template-columns: 1fr; padding: var(--space-3); }
  .course-sidebar { position: fixed; top: 56px; right: 0; bottom: 0; width: 320px; max-width: 90vw; max-height: none; transform: translateX(100%); transition: transform var(--transition); z-index: var(--z-modal); border-radius: 0; }
  .course-sidebar[data-open="true"] { transform: translateX(0); }
}

/* ===== Player ===== */
.player-stage-inner { width: 100%; height: 100%; position: relative; aspect-ratio: 16/9; border-radius: var(--radius-lg); overflow: hidden; }
.player-stage-inner iframe { width: 100%; height: 100%; border: 0; }
.player-controls { position: absolute; bottom: 0; left: 0; right: 0; background: linear-gradient(transparent, rgba(0,0,0,.7)); padding: var(--space-3); display: flex; gap: var(--space-2); align-items: center; opacity: 0; transition: opacity var(--transition); }
.player-stage-inner:hover .player-controls, .player-controls[data-show="true"] { opacity: 1; }
.player-progress { flex: 1; height: 4px; background: rgba(255,255,255,.3); border-radius: var(--radius-full); cursor: pointer; position: relative; }
.player-progress-bar { height: 100%; background: var(--accent); border-radius: inherit; transition: width 100ms linear; }
.player-time { color: white; font-size: var(--text-xs); font-family: var(--font-mono); white-space: nowrap; }
.player-btn { background: transparent; border: 0; color: white; cursor: pointer; padding: var(--space-1); display: flex; align-items: center; }
.player-btn:hover { color: var(--accent); }
.player-message { position: absolute; inset: 0; display: flex; align-items: center; justify-content: center; flex-direction: column; gap: var(--space-3); background: rgba(0,0,0,.7); color: white; z-index: 10; }
.player-countdown { font-size: var(--text-4xl); font-family: var(--font-mono); }

.player-unmute { position: absolute; bottom: var(--space-4); left: 50%; transform: translateX(-50%); background: rgba(0,0,0,.8); color: white; border: 1px solid rgba(255,255,255,.2); padding: var(--space-2) var(--space-4); border-radius: var(--radius-full); display: flex; align-items: center; gap: var(--space-2); cursor: pointer; font-size: var(--text-sm); z-index: 5; backdrop-filter: blur(8px); }
.player-unmute:hover { background: rgba(0,0,0,.9); border-color: var(--accent); }

/* ===== Click shield: cobre o iframe, intercepta cliques pra esconder UI do YouTube ===== */
/* z-index abaixo dos controles (2) e do player-unmute (5), acima do iframe */
.player-shield {
  position: absolute; inset: 0; z-index: 1;
  display: flex; align-items: center; justify-content: center;
  cursor: pointer; background: transparent;
  transition: background var(--transition);
}
/* Faixa superior do iframe (esconde título + nome do canal do YouTube) */
.player-shield::before {
  content: ""; position: absolute; top: 0; left: 0; right: 0; height: 60px;
  background: linear-gradient(rgba(0,0,0,.6), transparent);
  pointer-events: none;
}
/* Botão de play centralizado (nosso, no lugar do botão vermelho do YT) */
.player-shield-play {
  width: 80px; height: 80px; border-radius: 50%;
  background: rgba(0,0,0,.6); color: white;
  display: flex; align-items: center; justify-content: center;
  border: 2px solid rgba(255,255,255,.9);
  transition: background var(--transition), transform var(--transition);
  backdrop-filter: blur(4px);
}
.player-shield:hover .player-shield-play { background: var(--accent); transform: scale(1.08); }
/* Quando o vídeo está tocando, o shield some (deixa cliques passarem? não — fica oculto e os controles ficam por cima) */
.player-stage[data-playing="true"] .player-shield { opacity: 0; pointer-events: none; }
/* Cobertura suave inferior pra esconder o "Assista no YouTube" e logo, quando NÃO está tocando.
   Quando tocando, nossos próprios .player-controls cobrem essa região. */
.player-shield::after {
  content: ""; position: absolute; bottom: 0; left: 0; right: 0; height: 50px;
  background: linear-gradient(transparent, rgba(0,0,0,.5));
  pointer-events: none;
}

/* ===== Tabela responsiva: vira cards no mobile ===== */
@media (max-width: 768px) {
  .table-responsive thead { display: none; }
  .table-responsive, .table-responsive tbody, .table-responsive tr, .table-responsive td { display: block; width: 100%; }
  .table-responsive tr { border: 1px solid var(--border); border-radius: var(--radius-lg); margin-bottom: var(--space-3); padding: var(--space-2); background: var(--bg-elevated); }
  .table-responsive td { border: 0; padding: var(--space-2) var(--space-3); display: flex; justify-content: space-between; align-items: center; gap: var(--space-3); }
  .table-responsive td:before { content: attr(data-label); font-size: var(--text-xs); font-weight: var(--weight-semibold); color: var(--fg-muted); text-transform: uppercase; letter-spacing: 0.05em; }
  .table-responsive td[data-label="Ações"] { flex-direction: column; align-items: stretch; }
  .table-responsive td[data-label="Ações"]:before { margin-bottom: var(--space-2); }
  .table-responsive .row-actions { justify-content: stretch !important; flex-direction: column; gap: var(--space-2) !important; }
  .table-responsive .row-actions > * { width: 100%; }
  .table-responsive .row-actions form { width: 100%; }
  .table-responsive .row-actions form .btn { width: 100%; }
}

/* ===== Player inline no mobile (não mais overlay fixed) ===== */
@media (max-width: 1023px) {
  .player-stage {
    position: relative !important;
    inset: auto !important;
    backdrop-filter: none !important;
    background: transparent !important;
    z-index: auto !important;
    aspect-ratio: 16/9 !important;
    display: block !important;
    border-radius: var(--radius-lg) !important;
    width: 100%;
  }
  .player-stage[data-collapsed="true"] { display: block !important; }
}

/* ===== Admin structure tree responsive ===== */
@media (max-width: 768px) {
  /* Module/chapter row headers: empilha título e ações */
  #course-tree .card-header { flex-direction: column; align-items: stretch !important; gap: var(--space-2); padding: var(--space-3); }
  #course-tree .card-header .row { flex-wrap: wrap; }
  #course-tree .card-body { padding: var(--space-3) !important; }
  /* Action buttons quebram em multiline e ficam menores */
  #course-tree .card-header > .row:last-child { width: 100%; justify-content: flex-end; }
  #course-tree .lesson-row { flex-wrap: wrap; padding-left: var(--space-3); }
}

/* Floating action button (sidebar do aluno no mobile) */
.sidebar-fab { position: fixed; bottom: var(--space-6); right: var(--space-6); z-index: var(--z-modal); width: 56px; height: 56px; padding: 0; border-radius: 50%; box-shadow: var(--shadow-lg); display: flex; align-items: center; justify-content: center; }
.sidebar-fab:hover { box-shadow: var(--shadow-xl); transform: translateY(-2px); }

/* ===== Dropdown menu ===== */
.dropdown { position: relative; display: inline-block; }
.dropdown-menu { position: absolute; top: calc(100% + 4px); right: 0; min-width: 180px; background: var(--bg-elevated); border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow-lg); padding: var(--space-1); display: none; z-index: var(--z-dropdown); }
.dropdown-menu[data-open="true"] { display: flex; flex-direction: column; gap: 2px; }
.dropdown-item { display: flex; align-items: center; gap: var(--space-2); padding: var(--space-2) var(--space-3); border-radius: var(--radius-sm); cursor: pointer; color: var(--fg); text-decoration: none; font-size: var(--text-sm); background: transparent; border: 0; text-align: left; width: 100%; }
.dropdown-item:hover { background: var(--bg-muted); text-decoration: none; }
.dropdown-item-danger { color: var(--danger); }
.dropdown-item-danger:hover { background: var(--danger-bg); }
.dropdown-divider { height: 1px; background: var(--border); margin: var(--space-1) 0; }

/* ===== Quiz editor settings bar ===== */
.quiz-settings { display: grid; grid-template-columns: 1fr 1fr auto; gap: var(--space-4); align-items: end; }
@media (max-width: 768px) {
  .quiz-settings { grid-template-columns: 1fr; }
}

/* ===== Sidebar do aluno: acordeão por módulo ===== */
.sidebar-module { border: 0; }
.sidebar-module > summary { list-style: none; }
.sidebar-module > summary::-webkit-details-marker { display: none; }
.sidebar-module-summary { display: flex; align-items: center; gap: var(--space-2); padding: var(--space-2) var(--space-3); cursor: pointer; border-radius: var(--radius); font-weight: var(--weight-semibold); user-select: none; }
.sidebar-module-summary:hover { background: var(--bg-muted); }
.sidebar-module-chevron { transition: transform var(--transition); color: var(--fg-muted); flex-shrink: 0; }
.sidebar-module[open] .sidebar-module-chevron { transform: rotate(0deg); }
.sidebar-module:not([open]) .sidebar-module-chevron { transform: rotate(-90deg); }
.sidebar-module-body { padding-top: var(--space-1); }

/* ===== Recolher sidebar (desktop) ===== */
.course-shell { transition: grid-template-columns var(--transition); }
.course-shell[data-sidebar-collapsed="true"] { grid-template-columns: 1fr 0; }
.course-shell[data-sidebar-collapsed="true"] .course-sidebar { padding: 0; opacity: 0; pointer-events: none; max-height: 0; overflow: hidden; }
.sidebar-collapse-btn {
  position: absolute; top: var(--space-3); right: var(--space-3); z-index: 2;
  width: 32px; height: 32px; min-width: 32px; padding: 0; margin: 0;
  display: inline-flex; align-items: center; justify-content: center;
  background: var(--bg-elevated); border: 1px solid var(--border-strong); border-radius: 50%;
  color: var(--fg); cursor: pointer; box-shadow: var(--shadow-sm);
  transition: background var(--transition), color var(--transition), border-color var(--transition), transform var(--transition);
}
.sidebar-collapse-btn:hover { background: var(--accent); color: var(--accent-fg); border-color: var(--accent); transform: scale(1.05); }
.sidebar-collapse-btn:active { transform: scale(0.95); }
/* Reserva espaço pro botão de recolher, pra não cobrir o título do curso */
.course-sidebar .stack-2 > strong:first-child { display: block; padding-right: 40px; line-height: 1.3; }
.sidebar-show-btn {
  position: fixed; top: 50%; right: 0; transform: translateY(-50%); z-index: var(--z-dropdown);
  background: var(--accent); color: var(--accent-fg);
  border-radius: var(--radius-lg) 0 0 var(--radius-lg);
  width: 36px; height: 60px; display: none; align-items: center; justify-content: center;
  box-shadow: var(--shadow-lg); cursor: pointer; border: 0;
  transition: width var(--transition), background var(--transition);
}
.sidebar-show-btn:hover { width: 44px; background: var(--accent-hover); }
.course-shell[data-sidebar-collapsed="true"] ~ .sidebar-show-btn { display: flex; }
@media (max-width: 1023px) {
  .sidebar-collapse-btn, .sidebar-show-btn { display: none !important; }
}

/* ===== Stat pills (estatísticas compactas em listagens) ===== */
.course-stats { display: flex; flex-wrap: wrap; gap: var(--space-2); }
.stat-pill {
  display: inline-flex; align-items: center; gap: var(--space-1);
  padding: var(--space-1) var(--space-3);
  background: var(--bg-muted);
  border: 1px solid var(--border);
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  color: var(--fg);
  white-space: nowrap;
}
.stat-pill strong { font-weight: var(--weight-semibold); color: var(--fg); }
.stat-pill-label { color: var(--fg-muted); }
.stat-pill svg { color: var(--accent); flex-shrink: 0; }

/* ===== Bloco de template de email (configurações) ===== */
.email-template-block {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: var(--space-4);
  background: var(--bg-muted);
  display: flex; flex-direction: column; gap: var(--space-3);
}
.email-template-title { margin: 0; font-size: var(--text-base); }

/* ===== Filtros da lista de usuários (admin) ===== */
.user-filters {
  display: grid;
  grid-template-columns: 1fr 180px 180px auto;
  gap: var(--space-3);
  align-items: end;
}
@media (max-width: 768px) {
  .user-filters { grid-template-columns: 1fr; }
}