/* =====================================================================
   SipVoip — Design System
   Tema escuro de infraestrutura: navy profundo + esmeralda.
   Tipografia IBM Plex Sans (texto) e IBM Plex Mono (specs, números).
   ===================================================================== */

:root {
  /* Cores da marca */
  --bg: #0B1220;             /* fundo base navy */
  --surface: #111A2E;        /* superfícies (cards, header) */
  --surface-2: #16213A;      /* superfície elevada / hover */
  --primary: #34D399;        /* esmeralda — CTAs, links, destaques */
  --primary-strong: #0E9F6E; /* esmeralda escura — hover de botão */
  --primary-tint: rgba(52, 211, 153, 0.10);
  --text: #E2E8F0;           /* texto principal */
  --text-2: #8FA3BF;         /* texto secundário */
  --line: #1E293B;           /* bordas */
  --danger: #F87171;

  /* Tokens */
  --radius: 12px;
  --radius-sm: 8px;
  --radius-lg: 18px;
  --container: 1120px;
  --shadow: 0 12px 40px rgba(0, 0, 0, 0.35);
  --font-sans: "IBM Plex Sans", "Segoe UI", system-ui, sans-serif;
  --font-mono: "IBM Plex Mono", "SFMono-Regular", Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  font-family: var(--font-sans);
  color: var(--text);
  background: var(--bg);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  font-family: var(--font-sans);
  font-weight: 600;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin: 0 0 0.45em;
  color: var(--text);
}
h1 { font-size: clamp(2rem, 4.6vw, 3.15rem); font-weight: 700; }
h2 { font-size: clamp(1.55rem, 3.2vw, 2.2rem); }
h3 { font-size: 1.2rem; }
p { margin: 0 0 1rem; color: var(--text-2); }
a { color: var(--primary); text-decoration: none; }
a:hover { color: #6EE7B7; }
img, svg { max-width: 100%; }
ul { margin: 0; padding: 0; }
code, kbd { font-family: var(--font-mono); font-size: 0.9em; }

::selection { background: var(--primary); color: var(--bg); }

.container { width: 100%; max-width: var(--container); margin: 0 auto; padding: 0 24px; }
.section { padding: 92px 0; }
.section--alt {
  background: linear-gradient(180deg, var(--surface) 0%, var(--bg) 100%);
  border-top: 1px solid var(--line);
}
.center { text-align: center; }
.lead { font-size: 1.12rem; max-width: 640px; }
.center .lead { margin-left: auto; margin-right: auto; }

/* Etiqueta técnica acima dos títulos */
.kicker {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--primary);
  border: 1px solid var(--line);
  background: var(--primary-tint);
  padding: 5px 12px;
  border-radius: 6px;
  margin-bottom: 18px;
}

/* Badge mono (codecs, protocolos, PABX) */
.spec-badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 4px 10px;
  white-space: nowrap;
}
.spec-badge--on { border-color: var(--primary-strong); color: var(--primary); }

/* ---------- Botões ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 0.97rem;
  line-height: 1;
  padding: 13px 22px;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  cursor: pointer;
  transition: background 0.15s ease, border-color 0.15s ease, color 0.15s ease, transform 0.1s ease;
}
.btn:active { transform: translateY(1px); }
.btn--primary { background: var(--primary); color: #06281B; }
.btn--primary:hover { background: var(--primary-strong); color: #E7FFF5; }
.btn--ghost { background: transparent; color: var(--text); border-color: var(--line); }
.btn--ghost:hover { border-color: var(--primary); color: var(--primary); }
.btn--lg { padding: 16px 28px; font-size: 1.05rem; }

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(11, 18, 32, 0.88);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.nav {
  display: flex;
  align-items: center;
  gap: 28px;
  min-height: 68px;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
}
.brand:hover { color: var(--text); }
.brand-symbol { width: 36px; height: 36px; display: block; }
.brand-word {
  font-size: 1.22rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  line-height: 1;
}
.brand-word .w-sip { font-family: var(--font-mono); color: var(--primary); font-weight: 500; }
.brand-word .w-voip { font-family: var(--font-sans); color: var(--text); }

.nav-links {
  display: flex;
  align-items: center;
  gap: 24px;
  list-style: none;
  margin-left: auto;
}
.nav-links a { color: var(--text-2); font-weight: 500; font-size: 0.95rem; }
.nav-links a:hover { color: var(--text); }
.nav-actions { display: flex; align-items: center; gap: 10px; }
.nav-actions .btn { padding: 10px 16px; font-size: 0.9rem; }

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 42px;
  height: 42px;
  padding: 8px;
  background: transparent;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  cursor: pointer;
}
.nav-toggle span {
  display: block;
  height: 2px;
  width: 100%;
  background: var(--text);
  border-radius: 2px;
  transition: transform 0.2s ease, opacity 0.2s ease;
}
.nav.open .nav-toggle span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav.open .nav-toggle span:nth-child(2) { opacity: 0; }
.nav.open .nav-toggle span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- Hero ---------- */
.hero {
  padding: 96px 0 100px;
  background:
    radial-gradient(900px 420px at 15% -10%, rgba(52, 211, 153, 0.08), transparent 60%),
    radial-gradient(700px 380px at 95% 10%, rgba(52, 211, 153, 0.05), transparent 55%);
  border-bottom: 1px solid var(--line);
}
.hero-grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 56px;
  align-items: center;
}
.hero h1 span { color: var(--primary); }
.hero-cta { display: flex; flex-wrap: wrap; gap: 14px; margin: 28px 0 26px; }
.hero-points {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  list-style: none;
}

/* ---------- Bloco terminal ---------- */
.term {
  background: #0A101C;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}
.term-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  background: var(--surface);
  border-bottom: 1px solid var(--line);
}
.term-bar i {
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--line);
}
.term-bar i:first-child { background: var(--primary-strong); }
.term-title {
  margin-left: 8px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-2);
}
.term-body {
  margin: 0;
  padding: 18px 20px;
  font-family: var(--font-mono);
  font-size: 0.84rem;
  line-height: 1.7;
  color: var(--text);
  overflow-x: auto;
  white-space: pre;
}
.term-body .c { color: #5B6B84; }          /* comentário */
.term-body .k { color: var(--primary); }   /* chave/seção */
.term-body .v { color: #93C5FD; }          /* valor */

/* ---------- Cards genéricos ---------- */
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; }

.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 26px;
}
.card h3 { margin-top: 14px; }
.card p { margin-bottom: 0; font-size: 0.96rem; }
.card-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 10px;
  background: var(--primary-tint);
  border: 1px solid var(--line);
  color: var(--primary);
}

/* ---------- Preços ---------- */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 22px;
  max-width: 860px;
  margin: 0 auto;
}
.price-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 30px;
  display: flex;
  flex-direction: column;
}
.price-card--hot { border-color: var(--primary-strong); position: relative; }
.price-flag {
  position: absolute;
  top: -13px;
  left: 26px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: #06281B;
  background: var(--primary);
  border-radius: 6px;
  padding: 4px 10px;
}
.price-name { font-size: 1.15rem; font-weight: 600; margin-bottom: 2px; }
.price-desc { font-size: 0.92rem; margin-bottom: 18px; }
.price-value { font-family: var(--font-mono); margin-bottom: 4px; }
.price-value b { font-size: 2.1rem; font-weight: 600; color: var(--text); }
.price-value span { color: var(--text-2); font-size: 0.9rem; }
.price-note { font-family: var(--font-mono); font-size: 0.8rem; color: var(--text-2); margin-bottom: 20px; }
.price-list { list-style: none; margin: 0 0 26px; display: grid; gap: 10px; }
.price-list li {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  font-size: 0.94rem;
  color: var(--text);
}
.price-list li svg { flex: 0 0 auto; margin-top: 4px; color: var(--primary); }
.price-card .btn { margin-top: auto; }

/* Card E1 virtual (destaque horizontal) */
.e1-card {
  max-width: 860px;
  margin: 26px auto 0;
  background: linear-gradient(135deg, var(--surface-2) 0%, var(--surface) 70%);
  border: 1px solid var(--primary-strong);
  border-radius: var(--radius-lg);
  padding: 30px;
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 28px;
  align-items: center;
}
.e1-prices { display: grid; gap: 14px; }
.e1-price-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  background: rgba(11, 18, 32, 0.55);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  padding: 14px 18px;
}
.e1-price-row .label { font-weight: 600; color: var(--text); }
.e1-price-row .val { font-family: var(--font-mono); color: var(--text); }
.e1-price-row .val b { font-size: 1.35rem; font-weight: 600; }
.e1-price-row .val span { color: var(--text-2); font-size: 0.85rem; }

.price-foot {
  max-width: 860px;
  margin: 22px auto 0;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--text-2);
  text-align: center;
}

/* ---------- Tabela de especificações ---------- */
.spec-table-wrap {
  max-width: 860px;
  margin: 0 auto;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow-x: auto;
  background: var(--surface);
}
table.spec-table { width: 100%; border-collapse: collapse; min-width: 560px; }
.spec-table th, .spec-table td {
  text-align: left;
  padding: 14px 20px;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}
.spec-table tr:last-child th, .spec-table tr:last-child td { border-bottom: 0; }
.spec-table th {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 500;
  letter-spacing: 0.05em;
  color: var(--text-2);
  white-space: nowrap;
  width: 34%;
}
.spec-table td { color: var(--text); font-size: 0.95rem; }
.spec-table td .spec-badge { margin: 2px 6px 2px 0; }

/* ---------- Compatibilidade ---------- */
.compat-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  max-width: 860px;
  margin: 0 auto;
}
.compat-item {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  padding: 20px 14px;
  text-align: center;
  font-family: var(--font-mono);
  font-size: 0.95rem;
  color: var(--text);
}
.compat-item small {
  display: block;
  font-family: var(--font-sans);
  color: var(--text-2);
  font-size: 0.78rem;
  margin-top: 4px;
}

/* ---------- Passos de ativação ---------- */
.steps { counter-reset: step; display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; }
.step {
  position: relative;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 26px 22px 22px;
}
.step::before {
  counter-increment: step;
  content: "0" counter(step);
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--primary);
  border: 1px solid var(--primary-strong);
  border-radius: 6px;
  padding: 3px 9px;
  margin-bottom: 14px;
}
.step h3 { font-size: 1.05rem; }
.step p { font-size: 0.92rem; margin-bottom: 0; }

/* ---------- FAQ ---------- */
.faq-list { max-width: 780px; margin: 0 auto; display: grid; gap: 12px; }
.faq-item {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}
.faq-item summary {
  list-style: none;
  cursor: pointer;
  padding: 18px 22px;
  font-weight: 600;
  color: var(--text);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 1.2rem;
  color: var(--primary);
  flex: 0 0 auto;
  transition: transform 0.2s ease;
}
.faq-item[open] summary::after { transform: rotate(45deg); }
.faq-item .faq-body { padding: 0 22px 20px; }
.faq-item .faq-body p { margin-bottom: 0.6rem; font-size: 0.96rem; }
.faq-item .faq-body p:last-child { margin-bottom: 0; }

/* ---------- CTA final ---------- */
.cta-band {
  background: linear-gradient(135deg, var(--surface-2) 0%, var(--surface) 60%);
  border: 1px solid var(--primary-strong);
  border-radius: var(--radius-lg);
  padding: 48px 40px;
  text-align: center;
}
.cta-band .lead { margin-left: auto; margin-right: auto; }
.cta-actions { display: flex; flex-wrap: wrap; gap: 14px; justify-content: center; margin-top: 26px; }
.cta-mail {
  margin-top: 18px;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--text-2);
}

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--line);
  background: #080D18;
  padding: 44px 0 36px;
}
.footer-grid {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.footer-brand { display: inline-flex; align-items: center; gap: 10px; }
.footer-brand .brand-symbol { width: 26px; height: 26px; opacity: 0.85; }
.footer-brand .brand-word { font-size: 1rem; }
.footer-links { display: flex; flex-wrap: wrap; gap: 20px; list-style: none; }
.footer-links a { color: var(--text-2); font-size: 0.92rem; }
.footer-links a:hover { color: var(--text); }
.footer-copy { width: 100%; margin-top: 10px; font-family: var(--font-mono); font-size: 0.8rem; color: var(--text-2); }

/* ---------- Blog ---------- */
.page-head { padding: 72px 0 20px; }
.post-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 22px; padding-bottom: 80px; }
.post-card {
  display: flex;
  flex-direction: column;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 26px;
  color: var(--text);
  transition: border-color 0.15s ease, transform 0.15s ease;
}
.post-card:hover { border-color: var(--primary-strong); transform: translateY(-2px); color: var(--text); }
.post-card h2 { font-size: 1.25rem; margin: 12px 0 8px; }
.post-card p { font-size: 0.94rem; margin-bottom: 14px; }
.post-tag {
  align-self: flex-start;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--primary);
  background: var(--primary-tint);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 4px 10px;
}
.post-meta { margin-top: auto; font-family: var(--font-mono); font-size: 0.8rem; color: var(--text-2); }

/* ---------- Artigo ---------- */
.article { max-width: 760px; padding-top: 48px; padding-bottom: 88px; }
.breadcrumb { font-family: var(--font-mono); font-size: 0.82rem; color: var(--text-2); margin-bottom: 18px; }
.breadcrumb a { color: var(--text-2); }
.breadcrumb a:hover { color: var(--primary); }
.article > .post-tag { display: inline-block; margin-bottom: 14px; }
.article h1 { font-size: clamp(1.8rem, 4vw, 2.5rem); }
.article-meta { font-family: var(--font-mono); font-size: 0.84rem; color: var(--text-2); margin-bottom: 34px; }
.article h2 { margin-top: 2em; font-size: 1.5rem; }
.article h3 { margin-top: 1.5em; font-size: 1.15rem; }
.article p, .article li { color: var(--text-2); }
.article li { margin-bottom: 0.4rem; }
.article ul, .article ol { padding-left: 1.3rem; margin-bottom: 1.1rem; }
.article strong { color: var(--text); }

.callout {
  border: 1px solid var(--line);
  border-left: 3px solid var(--primary);
  background: var(--surface);
  border-radius: var(--radius-sm);
  padding: 16px 20px;
  margin: 22px 0;
}
.callout p { margin-bottom: 0; color: var(--text); font-size: 0.96rem; }

.article pre {
  background: #0A101C;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  padding: 18px 20px;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.84rem;
  line-height: 1.7;
  color: var(--text);
  margin: 22px 0;
}
.article code { background: var(--surface); border: 1px solid var(--line); border-radius: 5px; padding: 1px 6px; color: var(--text); }
.article pre code { background: none; border: 0; padding: 0; }

.table-wrap {
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  overflow-x: auto;
  margin: 22px 0;
  background: var(--surface);
}
.table-wrap table { width: 100%; border-collapse: collapse; min-width: 520px; }
.table-wrap th, .table-wrap td { text-align: left; padding: 11px 16px; border-bottom: 1px solid var(--line); font-size: 0.92rem; }
.table-wrap tr:last-child td { border-bottom: 0; }
.table-wrap th { font-family: var(--font-mono); font-size: 0.78rem; letter-spacing: 0.05em; color: var(--text-2); font-weight: 500; }
.table-wrap td { color: var(--text); }
.table-wrap td.num, .table-wrap th.num { font-family: var(--font-mono); text-align: right; }

/* ---------- Páginas legais / 404 ---------- */
.legal { max-width: 760px; padding-top: 56px; padding-bottom: 88px; }
.legal h1 { font-size: clamp(1.7rem, 3.6vw, 2.3rem); }
.legal h2 { margin-top: 1.8em; font-size: 1.3rem; }
.legal-updated { font-family: var(--font-mono); font-size: 0.82rem; color: var(--text-2); margin-bottom: 30px; }

.notfound { min-height: 58vh; display: flex; align-items: center; text-align: center; padding: 80px 0; }
.notfound-inner { margin: 0 auto; max-width: 560px; }
.notfound-code {
  font-family: var(--font-mono);
  font-size: clamp(3.4rem, 10vw, 5.5rem);
  font-weight: 600;
  color: var(--primary);
  line-height: 1;
  margin-bottom: 10px;
}

/* ---------- Responsivo ---------- */
@media (max-width: 980px) {
  .hero-grid { grid-template-columns: 1fr; gap: 40px; }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .steps { grid-template-columns: repeat(2, 1fr); }
  .compat-grid { grid-template-columns: repeat(3, 1fr); }
  .e1-card { grid-template-columns: 1fr; }
}

@media (max-width: 820px) {
  .nav-links, .nav-actions { display: none; }
  .nav-toggle { display: flex; margin-left: auto; }
  .nav { flex-wrap: wrap; }
  .nav.open .nav-links {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
    width: 100%;
    order: 4;
    margin: 6px 0 4px;
    padding-top: 10px;
    border-top: 1px solid var(--line);
  }
  .nav.open .nav-links a { display: block; padding: 10px 4px; font-size: 1.02rem; }
  .nav.open .nav-actions {
    display: flex;
    width: 100%;
    order: 5;
    padding: 8px 0 16px;
  }
  .nav.open .nav-actions .btn { flex: 1; }
  .section { padding: 68px 0; }
  .hero { padding: 64px 0 72px; }
}

@media (max-width: 640px) {
  .grid-3, .grid-4, .pricing-grid, .post-grid, .steps { grid-template-columns: 1fr; }
  .compat-grid { grid-template-columns: repeat(2, 1fr); }
  .cta-band { padding: 36px 22px; }
}