/* =========================================================
   Tema escuro estilo terminal/IDE — Referência PHP (pt-BR)
   Tokens de cor definidos como variáveis CSS (custom properties).
   ========================================================= */
:root {
  --bg: #0d0f17;       /* fundo principal */
  --bg-2: #141826;     /* fundo secundário (índice lateral) */
  --panel: #1a1f30;    /* painéis / blocos de código */
  --line: #2a3145;     /* bordas e divisórias */
  --ink: #e7e9f0;      /* texto principal */
  --muted: #8a91a8;    /* texto secundário/apagado */
  --acc: #9fef7b;      /* verde terminal — destaque principal */
  --acc-2: #ff8a5c;    /* laranja */
  --acc-3: #6cb6ff;    /* azul */
  --warn: #ffd166;     /* amarelo aviso */
  --mono: 'Space Mono', monospace;
  --disp: 'Fraunces', serif;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--mono);
  color: var(--ink);
  background-color: var(--bg);
  /* Gradiente radial sutil sobre o fundo plano, dá profundidade */
  background-image:
    radial-gradient(900px 600px at 15% -10%, rgba(108, 182, 255, .08), transparent 60%),
    radial-gradient(800px 500px at 100% 0%, rgba(159, 239, 123, .06), transparent 55%);
  background-attachment: fixed;
  line-height: 1.6;
  font-size: 15px;
}

/* ---------- Scrollbar custom ---------- */
::-webkit-scrollbar { width: 11px; height: 11px; }
::-webkit-scrollbar-track { background: var(--bg-2); }
::-webkit-scrollbar-thumb {
  background: var(--line);
  border-radius: 6px;
  border: 2px solid var(--bg-2);
}
::-webkit-scrollbar-thumb:hover { background: #3a435f; }

/* =========================================================
   LAYOUT: índice lateral fixo + área de conteúdo
   ========================================================= */
.shell {
  display: grid;
  grid-template-columns: 280px 1fr;
  max-width: 1280px;
  margin: 0 auto;
  min-height: 100vh;
}

/* ---------- Índice lateral (sidebar) ---------- */
.sidebar {
  position: sticky;
  top: 0;
  align-self: start;
  height: 100vh;
  overflow-y: auto;
  background: var(--bg-2);
  border-right: 1px solid var(--line);
  padding: 28px 18px 40px;
}

.brand {
  font-family: var(--disp);
  font-size: 22px;
  font-weight: 600;
  color: var(--ink);
  letter-spacing: .3px;
  margin-bottom: 4px;
}
.brand .dot { color: var(--acc); }
.brand-sub {
  font-size: 11px;
  color: var(--muted);
  letter-spacing: 1.5px;
  text-transform: uppercase;
  margin-bottom: 26px;
}

/* Menu superior (Parte 1 / 2 / 3) */
.nav-parts {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-bottom: 28px;
  padding-bottom: 22px;
  border-bottom: 1px solid var(--line);
}
.nav-parts a {
  display: flex;
  align-items: baseline;
  gap: 9px;
  text-decoration: none;
  color: var(--muted);
  padding: 7px 10px;
  border-radius: 7px;
  border: 1px solid transparent;
  transition: .15s;
  font-size: 13px;
}
.nav-parts a:hover { color: var(--ink); background: var(--panel); }
.nav-parts a.active {
  color: var(--ink);
  background: var(--panel);
  border-color: var(--line);
}
.nav-parts a .n {
  font-size: 11px;
  color: var(--acc);
  font-weight: 700;
}

/* Índice por âncoras, agrupado por categoria */
.toc-group { margin-bottom: 22px; }
.toc-group h4 {
  font-size: 10px;
  letter-spacing: 1.6px;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 8px;
  padding-left: 11px;
}
.toc-group a {
  display: block;
  text-decoration: none;
  color: var(--muted);
  font-size: 13px;
  padding: 5px 11px;
  border-left: 2px solid transparent;
  transition: .14s;
}
.toc-group a:hover {
  color: var(--ink);
  border-left-color: var(--acc);
  background: rgba(159, 239, 123, .04);
}

/* ---------- Área de conteúdo ---------- */
.content {
  padding: 46px 52px 120px;
  min-width: 0; /* impede overflow do grid por causa do <pre> */
}

.page-head { margin-bottom: 50px; }
.page-head .kicker {
  font-size: 12px;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--acc-3);
  margin-bottom: 12px;
}
.page-head h1 {
  font-family: var(--disp);
  font-weight: 600;
  font-size: 44px;
  line-height: 1.1;
  color: var(--ink);
  margin-bottom: 16px;
}
.page-head p {
  color: var(--muted);
  max-width: 620px;
  font-size: 15px;
}

/* ---------- Seção ---------- */
.section { margin-bottom: 56px; scroll-margin-top: 24px; }
.section-title {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 14px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
}
.section-title .num {
  font-family: var(--mono);
  font-size: 14px;
  font-weight: 700;
  color: var(--acc);
}
.section-title h2 {
  font-family: var(--disp);
  font-weight: 600;
  font-size: 26px;
  color: var(--ink);
}
.section > p { color: var(--muted); margin-bottom: 16px; max-width: 680px; }
.section > p code, .callout code, li code {
  font-family: var(--mono);
  background: var(--panel);
  color: var(--acc-3);
  padding: 1px 6px;
  border-radius: 5px;
  font-size: 13px;
  border: 1px solid var(--line);
}

/* =========================================================
   BLOCO DE CÓDIGO estilo janela de terminal
   ========================================================= */
.code {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 11px;
  overflow: hidden;
  margin: 16px 0 22px;
  box-shadow: 0 14px 30px -18px rgba(0, 0, 0, .7);
}

/* Barra superior com dots + nome do arquivo + botão copiar */
.code-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 14px;
  background: var(--bg-2);
  border-bottom: 1px solid var(--line);
}
.dots { display: flex; gap: 7px; }
.dots span {
  width: 12px; height: 12px;
  border-radius: 50%;
  display: inline-block;
}
.dots .r { background: #ff5f56; }
.dots .y { background: #ffbd2e; }
.dots .g { background: #27c93f; }

.code-name {
  font-size: 12px;
  color: var(--muted);
  flex: 1;
}

.copy-btn {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--muted);
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 4px 11px;
  cursor: pointer;
  transition: .15s;
  letter-spacing: .4px;
}
.copy-btn:hover { color: var(--ink); border-color: var(--acc); }
.copy-btn.done { color: var(--acc); border-color: var(--acc); }

/* Código em si */
.code pre {
  margin: 0;
  padding: 18px 20px;
  overflow-x: auto;
  font-family: var(--mono);
  font-size: 13.5px;
  line-height: 1.7;
}
.code code { font-family: var(--mono); white-space: pre; }

/* ---------- Syntax highlight (classes via <span>) ---------- */
.t-com { color: var(--muted); font-style: italic; }  /* comentário */
.t-key { color: var(--acc-2); }                       /* palavra-chave */
.t-var { color: var(--acc-3); }                       /* variável */
.t-str { color: var(--acc); }                         /* string */
.t-fn  { color: var(--warn); }                        /* função */
.t-num { color: #d6a3ff; }                            /* número */
.t-tag { color: #ff5f9e; font-weight: 700; }          /* tag PHP <?php ?> */

/* =========================================================
   CALLOUT de aviso (borda esquerda amarela)
   ========================================================= */
.callout {
  background: rgba(255, 209, 102, .06);
  border: 1px solid var(--line);
  border-left: 3px solid var(--warn);
  border-radius: 9px;
  padding: 14px 18px;
  margin: 18px 0;
  color: var(--ink);
  font-size: 14px;
}
.callout strong { color: var(--warn); }

/* Tabela-resumo */
.tbl { width: 100%; border-collapse: collapse; margin: 18px 0 22px; font-size: 13.5px; }
.tbl th, .tbl td {
  text-align: left;
  padding: 9px 12px;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}
.tbl th { color: var(--acc); font-size: 11px; letter-spacing: 1px; text-transform: uppercase; }
.tbl td code { color: var(--acc-3); }

/* =========================================================
   CAPA (index)
   ========================================================= */
.cover { padding: 70px 52px 120px; max-width: 980px; margin: 0 auto; }
.cover .badge {
  display: inline-block;
  font-size: 12px;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--acc);
  border: 1px solid var(--line);
  border-radius: 30px;
  padding: 6px 16px;
  margin-bottom: 28px;
}
.cover h1 {
  font-family: var(--disp);
  font-weight: 600;
  font-size: 64px;
  line-height: 1.05;
  margin-bottom: 20px;
}
.cover h1 em { color: var(--acc); font-style: italic; }
.cover .lead { color: var(--muted); font-size: 18px; max-width: 640px; margin-bottom: 50px; }

.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.card {
  display: block;
  text-decoration: none;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 26px 22px;
  transition: .18s;
}
.card:hover { border-color: var(--acc); transform: translateY(-3px); }
.card .c-num { font-size: 13px; color: var(--acc); font-weight: 700; margin-bottom: 14px; }
.card h3 { font-family: var(--disp); font-size: 22px; color: var(--ink); margin-bottom: 8px; }
.card p { color: var(--muted); font-size: 13px; }

/* =========================================================
   RESPONSIVO: < 860px → índice vira topo, conteúdo empilha
   ========================================================= */
@media (max-width: 860px) {
  .shell { grid-template-columns: 1fr; }
  .sidebar {
    position: static;
    height: auto;
    border-right: none;
    border-bottom: 1px solid var(--line);
  }
  .content { padding: 32px 22px 80px; }
  .cover { padding: 44px 22px 80px; }
  .cover h1 { font-size: 42px; }
  .cards { grid-template-columns: 1fr; }
  .page-head h1 { font-size: 34px; }
}