/*
  Tema Central de Treinamento — variáveis CSS e utilitários
  Autor: Dante Testa — https://dantetesta.com.br
  Notas:
  - Mobile First
  - Acessibilidade: alto contraste, foco visível
  - Segurança/Perf: usar apenas onde necessário; evita sombras exageradas
*/

:root {
  /* Marca (Cupertino Blue e variações encontradas) */
  --brand-50:  #EDF5FF;
  --brand-100: #D7E9FF;
  --brand-200: #A8D0FF;
  --brand-300: #78B7FF;
  --brand-400: #3A97FF;
  --brand-500: #0A84FF; /* principal */
  --brand-600: #0077ED; /* hover/active */
  --brand-700: #0060D1;
  --brand-800: #004EAE;
  --brand-900: #003A82;

  /* Neutros usados nos layouts (Apple-like) */
  --neutral-50:  #F5F5F7;
  --neutral-100: #E5E5EA;
  --neutral-200: #D1D1D6;
  --neutral-300: #C7C7CC;
  --neutral-400: #AEAEB2;
  --neutral-500: #8E8E93;
  --neutral-600: #636366;
  --neutral-700: #48484A;
  --neutral-800: #3A3A3C;
  --neutral-900: #1f2937; /* text-gray-800 encontrado */

  /* Paletas auxiliares presentes (earth/forest/sky) */
  /* Earth */
  --earth-50:  #F9FAFB;
  --earth-100: #F5F5F7;
  --earth-200: #E5E5EA;
  --earth-300: #D1D1D6;
  --earth-400: #C7C7CC;
  --earth-500: #AEAEB2;
  --earth-600: #8E8E93;
  --earth-700: #636366;
  --earth-800: #48484A;
  --earth-900: #3A3A3C;
  /* Forest (mapeia brand) */
  --forest-50:  var(--brand-50);
  --forest-100: var(--brand-100);
  --forest-200: var(--brand-200);
  --forest-300: var(--brand-300);
  --forest-400: var(--brand-400);
  --forest-500: var(--brand-500);
  --forest-600: var(--brand-600);
  --forest-700: var(--brand-700);
  --forest-800: var(--brand-800);
  --forest-900: var(--brand-900);
  /* Sky */
  --sky-50:  #F5F9FF;
  --sky-100: #ECF3FF;
  --sky-200: #DCE9FF;
  --sky-300: #C5DAFF;
  --sky-400: #A9C9FF;
  --sky-500: #8FB8FF;
  --sky-600: #6EA4FF;
  --sky-700: #4A8CFF;
  --sky-800: #2E78FF;
  --sky-900: #1C66F0;

  /* Texto */
  --text-primary:  #111827; /* text-gray-900 usado em títulos */
  --text-base:     #1f2937; /* corpo */
  --text-muted:    #6B7280; /* text-gray-500 em rodapés */
  --text-secondary:#4B5563; /* text-gray-600 em parágrafos */
  --text-on-brand: #ffffff;

  /* Superfícies e fundos */
  --bg:            var(--neutral-50);
  --surface:       #ffffff;
  --surface-alt:   rgba(255,255,255,0.85);
  --overlay-dim:   rgba(0,0,0,0.40); /* backdrop mobile */

  /* Bordas e divisores */
  --border-subtle: rgba(0,0,0,0.08);
  --border-strong: rgba(0,0,0,0.16);
  --border-brand:  rgba(10,132,255,0.20);
  --divider:       rgba(0,0,0,0.06);

  /* Estados */
  --hover-bg:      var(--brand-50);
  --active-bg:     rgba(10,132,255,0.10);
  --focus-ring:    var(--brand-100);

  /* Vidro fosco (glass) */
  --glass-bg:      rgba(255,255,255,0.55);
  --glass-border:  rgba(255,255,255,0.60);
  --glass-shadow:  0 8px 30px rgba(0,0,0,0.08);
  --glass-blur:    18px;

  /* Sombras (inclui acento azul sutil usado) */
  --shadow-brand-1: 0 8px 25px rgba(10,132,255,0.18);
  --shadow-brand-2: 0 6px 18px rgba(10,132,255,0.12), 0 12px 36px rgba(10,132,255,0.10);
  --shadow-elev-1:  0 6px 16px rgba(0,0,0,0.06);
  --shadow-elev-2:  0 8px 30px rgba(0,0,0,0.08);
  --shadow-elev-3:  0 25px 50px -12px rgba(0,0,0,0.25);

  /* Gradientes e efeitos visuais usados */
  --gradient-button-from: var(--brand-500);
  --gradient-button-to:   var(--brand-700);
  --gradient-hero-a:      rgba(10,132,255,0.10);
  --gradient-hero-b:      rgba(245,245,247,1);
  --gradient-hero-c:      rgba(10,132,255,0.08);

  /* Elementos semânticos */
  --primary:   var(--brand-500);
  --primary-contrast: var(--text-on-brand);
  --surface-border: var(--border-subtle);

  /* Componentes (tokens) */
  --sidebar-bg:    rgba(255,255,255,0.60);
  --header-bg:     rgba(255,255,255,0.55);
  --card-bg:       linear-gradient(135deg, #ffffffF2, #F8FAFCEB);
  --card-border:   var(--border-brand);
  --category-bg:   var(--forest-50);
  --category-text: var(--forest-700);
  --date-text:     var(--neutral-600);
  --search-bg:     rgba(255,255,255,0.70);
  --search-border: var(--earth-200);
  --search-ph:     var(--neutral-500);
}

/* Dark mode pronto para uso (ajuste fino depois) */
@media (prefers-color-scheme: dark) {
  :root {
    --bg:            #0b0b0c;
    --surface:       #111214;
    --surface-alt:   #16181b;
    --text-primary:  #e5e7eb;
    --text-base:     #d1d5db;
    --text-secondary:#9ca3af;
    --text-muted:    #6b7280;

    --sidebar-bg:    rgba(20,22,25,0.60);
    --header-bg:     rgba(20,22,25,0.60);
    --glass-bg:      rgba(20,22,25,0.55);
    --glass-border:  rgba(255,255,255,0.08);
    --divider:       rgba(255,255,255,0.08);
    --border-subtle: rgba(255,255,255,0.08);
    --border-strong: rgba(255,255,255,0.16);

    --category-bg:   rgba(10,132,255,0.12);
    --category-text: var(--forest-300);
    --date-text:     #9ca3af;
    --search-bg:     rgba(255,255,255,0.06);
    --search-border: rgba(255,255,255,0.10);
    --search-ph:     #9ca3af;

    --overlay-dim:   rgba(0,0,0,0.60);
  }
}

/* Utilitários base (Apple-like clean) */
html, body { background: var(--bg); color: var(--text-base); }

.app-bg { background: var(--bg); }
.surface { background: var(--surface); }
.surface-alt { background: var(--surface-alt); }

.title, .heading {
  color: var(--text-primary);
  letter-spacing: -0.01em; /* cupertino-title */
}
.text-base { color: var(--text-base); }
.text-muted { color: var(--text-muted); }
.text-secondary { color: var(--text-secondary); }

.link { color: var(--primary); text-decoration: none; }
.link:hover { color: var(--brand-600); text-decoration: underline; }

.btn-primary {
  color: var(--primary-contrast);
  background-image: linear-gradient(135deg, var(--gradient-button-from), var(--gradient-button-to));
  border: 1px solid rgba(255,255,255,0.16);
  border-radius: 1rem;
  box-shadow: var(--shadow-brand-1);
  transition: transform .2s ease, box-shadow .2s ease, filter .2s ease;
}
.btn-primary:hover { filter: brightness(1.02); transform: translateY(-2px); box-shadow: var(--shadow-brand-2); }
.btn-primary:active { transform: translateY(0); }
.btn-primary:focus { outline: none; box-shadow: 0 0 0 4px var(--focus-ring); }

.badge-category {
  background: var(--category-bg);
  color: var(--category-text);
  border: 1px solid var(--earth-200);
  border-radius: 9999px;
}

.meta-date { color: var(--date-text); }

.input-search {
  background: var(--search-bg);
  color: var(--text-base);
  border: 1px solid var(--search-border);
}
.input-search::placeholder { color: var(--search-ph); }
.input-search:focus { outline: none; box-shadow: 0 0 0 2px var(--focus-ring); }

/* Vidro fosco (glass) */
.glass {
  background: var(--glass-bg);
  backdrop-filter: saturate(180%) blur(var(--glass-blur));
  -webkit-backdrop-filter: saturate(180%) blur(var(--glass-blur));
  border: 1px solid var(--glass-border);
  box-shadow: var(--glass-shadow);
}

/* Sombras e elevações */
.shadow-elev-1 { box-shadow: var(--shadow-elev-1); }
.shadow-elev-2 { box-shadow: var(--shadow-elev-2); }
.shadow-elev-3 { box-shadow: var(--shadow-elev-3); }
.shadow-brand-1 { box-shadow: var(--shadow-brand-1); }
.shadow-brand-2 { box-shadow: var(--shadow-brand-2); }

/* Hero decorativo (gradientes usados nas páginas iniciais) */
.hero-bg-css {
  background:
    radial-gradient(1000px 700px at 85% -10%, var(--gradient-hero-a), var(--gradient-hero-b) 45%),
    linear-gradient(135deg, var(--gradient-hero-c), rgba(255,255,255,0));
}

/* Estados genéricos */
.hover-bg:hover { background: var(--hover-bg); }
.active-bg:active { background: var(--active-bg); }
.focus-ring:focus { outline: none; box-shadow: 0 0 0 4px var(--focus-ring); }

/* Overlays */
.overlay-dim { background: var(--overlay-dim); }

/* Acessibilidade: foco visível em links e botões se não houver classe dedicada */
a:focus, button:focus { outline: none; box-shadow: 0 0 0 3px var(--focus-ring); border-radius: 0.5rem; }

/* Cabeçalho do módulo (accordion): sem bordas arredondadas, inclusive no foco */
.module-header { border-radius: 0 !important; }
.module-header:focus { border-radius: 0 !important; }

/* ===== Migrado de index.html: Hero decorativo, blobs e animações ===== */
/* Fundo decorativo da coluna direita */
.hero-bg {
  background:
    radial-gradient(1000px 700px at 85% -10%, var(--gradient-hero-a), var(--gradient-hero-b) 45%),
    linear-gradient(135deg, var(--gradient-hero-c), rgba(255,255,255,0));
  position: relative;
  overflow: hidden;
}
.hero-bg::before {
  content: '';
  position: absolute;
  inset: -20% -30% auto auto;
  width: 60vmin;
  height: 60vmin;
  background: radial-gradient(circle, rgba(10,132,255,0.18) 0%, rgba(10,132,255,0.0) 65%);
  filter: blur(6px);
  transform: translate(10%, -10%);
  pointer-events: none;
}

/* Blobs animados com diferentes velocidades */
.blob {
  position: absolute;
  border-radius: 9999px;
  filter: blur(20px);
  opacity: 0.45;
  will-change: transform, opacity;
  mix-blend-mode: screen;
}
.blob--one { background: radial-gradient(circle at 30% 30%, rgba(10,132,255,0.35), rgba(10,132,255,0)); }
.blob--two { background: radial-gradient(circle at 70% 40%, rgba(147,197,253,0.35), rgba(10,132,255,0)); }
.blob--three { background: radial-gradient(circle at 50% 60%, rgba(59,130,246,0.35), rgba(10,132,255,0)); }

@keyframes blobFloat {
  0%, 100% { transform: translate3d(0,0,0) scale(1); }
  50% { transform: translate3d(0,-12px,0) scale(1.05); }
}
@keyframes blobDrift {
  0% { transform: translateX(-10px); }
  50% { transform: translateX(10px); }
  100% { transform: translateX(-10px); }
}
.float-slow { animation: blobFloat 10s ease-in-out infinite; }
.float-med { animation: blobFloat 12s ease-in-out infinite; }
.float-fast { animation: blobFloat 8s ease-in-out infinite; }
.drift { animation: blobDrift 14s linear infinite; }

/* Container com perspectiva para tilt 3D sutil */
.tilt-3d { perspective: 1000px; }

/* Respeitar usuários com movimento reduzido */
@media (prefers-reduced-motion: reduce) {
  .float-slow, .float-med, .float-fast, .drift { animation: none !important; }
}

/* ===== Migrado de central.html: superfícies, botões, cards, scrollbars, skeleton, player ===== */
/* Fundo de página específico (radial claro Apple-like) */
.page-bg-central {
  background: radial-gradient(1200px 800px at 10% -10%, rgba(255,255,255,0.9), var(--neutral-50) 50%, var(--neutral-50) 100%);
}

/* Vidro fosco (alias para natureza) */
.nature-glass {
  background: var(--glass-bg);
  backdrop-filter: saturate(180%) blur(var(--glass-blur));
  -webkit-backdrop-filter: saturate(180%) blur(var(--glass-blur));
  border: 1px solid var(--glass-border);
  box-shadow: var(--glass-shadow);
}

/* Sombra com acento azul sutil */
.leaf-shadow { box-shadow: var(--shadow-brand-2), inset 0 1px 0 rgba(255,255,255,0.35); }

/* Cartão de vídeo */
.video-card {
  background: var(--surface-alt);
  border: 1px solid var(--border-subtle);
  transition: background 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
  position: relative;
  overflow: hidden;
}
.video-card::before {
  content: '';
  position: absolute;
  top: 0; left: -100%;
  width: 100%; height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.4), transparent);
  transition: left 0.6s;
}
.video-card:hover::before { left: 100%; }
.video-card:hover {
  box-shadow: var(--shadow-elev-1);
  border-color: var(--border-strong);
  background: rgba(255,255,255,0.92);
}
.video-card.active {
  background: rgba(255,255,255,0.95);
  border-color: var(--border-strong);
  box-shadow: var(--shadow-elev-1);
}

/* Botão com gradiente brand */
.nature-button {
  background: linear-gradient(135deg, var(--brand-500), var(--brand-700));
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
  color: #fff;
}
.nature-button::before {
  content: '';
  position: absolute; inset: 0;
  background: linear-gradient(135deg, rgba(255,255,255,0.2), transparent);
  opacity: 0; transition: opacity 0.3s;
}
.nature-button:hover::before { opacity: 1; }
.nature-button:hover { transform: translateY(-2px); box-shadow: 0 8px 25px rgba(10,132,255,0.35); }

/* Scrollbar custom (webkit) */
.scrollbar-nature::-webkit-scrollbar { width: 8px; }
.scrollbar-nature::-webkit-scrollbar-track { background: rgba(0,0,0,0.06); border-radius: 4px; }
.scrollbar-nature::-webkit-scrollbar-thumb { background: linear-gradient(135deg, #B9D7FF, #7FB6FF); border-radius: 4px; }
.scrollbar-nature::-webkit-scrollbar-thumb:hover { background: linear-gradient(135deg, #6EA4FF, #3A97FF); }

/* Player responsivo 16:9 */
.responsive-video { position: relative; width: 100%; padding-bottom: 56.25%; border-radius: 1rem; overflow: hidden; box-shadow: var(--shadow-elev-3); }
.responsive-video iframe,
.responsive-video video { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; }

/* Cupertino aliases */
.cupertino-glass { background: var(--glass-bg); backdrop-filter: saturate(180%) blur(20px); -webkit-backdrop-filter: saturate(180%) blur(20px); border: 1px solid var(--glass-border); }
.cupertino-shadow { box-shadow: 0 6px 20px rgba(0,0,0,0.06), inset 0 1px 0 rgba(255,255,255,0.35); }
.cupertino-divider { border-bottom: 1px solid var(--divider); background: rgba(255,255,255,0.5); backdrop-filter: saturate(180%) blur(16px); -webkit-backdrop-filter: saturate(180%) blur(16px); }
.cupertino-title { letter-spacing: -0.01em; }
.cupertino-select { background: rgba(255,255,255,0.6); border: 1px solid var(--border-subtle); }
.scrollbar-cupertino::-webkit-scrollbar { width: 8px; }
.scrollbar-cupertino::-webkit-scrollbar-track { background: rgba(0,0,0,0.05); border-radius: 4px; }
.scrollbar-cupertino::-webkit-scrollbar-thumb { background: rgba(0,0,0,0.18); border-radius: 4px; }
.scrollbar-cupertino::-webkit-scrollbar-thumb:hover { background: rgba(0,0,0,0.28); }

/* Skeleton loader */
@keyframes shimmer { 0% { transform: translateX(-100%); } 100% { transform: translateX(100%); } }
.skeleton { position: relative; overflow: hidden; background: rgba(0,0,0,0.06); border-radius: 8px; }
.skeleton::after { content: ''; position: absolute; inset: 0; background: linear-gradient(90deg, transparent, rgba(255,255,255,0.5), transparent); animation: shimmer 1.2s ease-in-out infinite; }
.skeleton-title { height: 0.9rem; width: 70%; }
.skeleton-meta { height: 0.7rem; width: 32%; }

/* Preloader em linhas retas (sem cantos arredondados) para listas no sidebar */
.skeleton-line { position: relative; overflow: hidden; background: rgba(0,0,0,0.08); height: 10px; border-radius: 0; }
.skeleton-line::after { content: ''; position: absolute; inset: 0; background: linear-gradient(90deg, transparent, rgba(255,255,255,0.5), transparent); animation: shimmer 1.2s ease-in-out infinite; }

/* Ponto indicador (dot) para reforçar leitura em lista */
.skeleton-dot { width: 8px; height: 8px; background: rgba(0,0,0,0.12); border-radius: 50%; position: relative; overflow: hidden; }
.skeleton-dot::after { content: ''; position: absolute; inset: 0; background: linear-gradient(90deg, transparent, rgba(255,255,255,0.4), transparent); animation: shimmer 1.2s ease-in-out infinite; border-radius: 50%; }

/* Barra de progresso indeterminada */
.progress-bar { position: sticky; top: 0; left: 0; right: 0; height: 3px; background: rgba(0,0,0,0.06); overflow: hidden; z-index: 10; }
.progress-bar__inner { position: absolute; left: -30%; top: 0; height: 100%; width: 30%; background: linear-gradient(90deg, rgba(10,132,255,0), rgba(10,132,255,0.65), rgba(10,132,255,0)); animation: progressSlide 1.2s ease-in-out infinite; }
@keyframes progressSlide { 0% { left: -30%; } 50% { left: 60%; } 100% { left: 110%; } }
.skeleton-icon { width: 14px; height: 14px; }
@media (prefers-reduced-motion: reduce) { .skeleton::after { animation: none; } }

/* Loader container: topo do sidebar com 50px de padding */
.loader-wrap { display: flex; align-items: center; justify-content: center; flex-direction: column; padding: 50px 0 16px; min-height: 120px; text-align: center; }

/* Spinner giratório */
.loader-spinner { width: 22px; height: 22px; border: 2px solid rgba(0,0,0,0.15); border-top-color: var(--brand-500); border-radius: 50%; animation: loaderSpin .9s linear infinite; }
@keyframes loaderSpin { to { transform: rotate(360deg); } }

/* Texto do loader */
.loader-text { margin-top: 10px; font-size: 12px; color: var(--earth-700); letter-spacing: 0.02em; }

/* Loader convencional: 3 bolinhas animadas (mantido caso usemos) */
.loader-dots { display: flex; align-items: center; gap: 8px; }
.loader-dot { width: 8px; height: 8px; border-radius: 50%; background: rgba(10,132,255,0.7); animation: loaderBlink 1s ease-in-out infinite; }
.loader-dot:nth-child(2) { animation-delay: .15s; }
.loader-dot:nth-child(3) { animation-delay: .3s; }
@keyframes loaderBlink { 0%, 80%, 100% { transform: scale(0.8); opacity: .35; } 40% { transform: scale(1.15); opacity: 1; } }
@media (prefers-reduced-motion: reduce) {
  .loader-dot { animation: none; opacity: .8; }
  .loader-spinner { animation: none; }
}

/* Lista Apple-like */
.video-row { position: relative; border-bottom: 1px solid var(--border-subtle); background: transparent; border-radius: 0; }
.video-row::before { content: ''; position: absolute; left: 0; top: 0; width: 3px; height: 100%; background: transparent; transition: background-color 0.2s ease; }
.video-row:hover::before { background: rgba(10,132,255,0.35); }
.video-row.active { background: rgba(0,0,0,0.03); }
.video-row.active::before { background: var(--brand-500); }

/* Anel de progresso circular (para contador por módulo) */
#currentVideoCategory.opacity-0 { display: none; }
.ring-progress { --size: 20px; --thickness: 2px; --p: 0; position: relative; width: var(--size); height: var(--size); display: inline-flex; align-items: center; justify-content: center; }
.ring-progress::before { content: ''; position: absolute; inset: 0; border-radius: 50%; background: conic-gradient(var(--brand-500) calc(var(--p)*1%), var(--earth-300) 0); box-shadow: 0 0 0 1px var(--earth-200) inset; z-index: 0; }
.ring-progress::after { content: ''; position: absolute; inset: calc(var(--thickness)); border-radius: 50%; background: var(--forest-50); border: 1px solid var(--earth-200); z-index: 1; }
.ring-progress .ring-number { position: relative; z-index: 2; font-size: calc(var(--size) * 0.468); color: var(--forest-700); line-height: 1; font-weight: 600; }
.ring-progress .ring-number--sm { font-size: calc(var(--size) * 0.42); letter-spacing: -0.02em; }