:root {
  --bg: #f5f7fb;
  --panel: #ffffff;
  --text: #1f2937;
  --muted: #6b7280;
  --primary: #2563eb;
  --primary-soft: #eff6ff;
  --border: #e5e7eb;
  --success: #166534;
  --danger-bg: #fef2f2;
  --danger-text: #991b1b;
  --header-bg: #111827;
  --header-text: #fff;
  --secondary: #eef2ff;
  --secondary-text: #1e3a8a;
  --secondary-border: #c7d2fe;
}

[data-theme="dark"] {
  --bg: #0f172a;
  --panel: #1e293b;
  --text: #f1f5f9;
  --muted: #94a3b8;
  --primary: #3b82f6;
  --primary-soft: #1e3a8a;
  --border: #334155;
  --success: #4ade80;
  --danger-bg: #7f1d1d;
  --danger-text: #fecaca;
  --header-bg: #0f172a;
  --header-text: #f1f5f9;
  --secondary: #1e293b;
  --secondary-text: #93c5fd;
  --secondary-border: #334155;
}

* { box-sizing: border-box; }
html { color-scheme: light; }

[data-theme="dark"] { color-scheme: dark; }
body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
}
a { color: inherit; }
p, li { line-height: 1.6; }
button, input { font: inherit; }

.site-header { background: var(--header-bg); color: var(--header-text); }
.topbar {
  max-width: 1120px;
  margin: 0 auto;
  padding: 16px 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}
.brand {
  font-weight: 700;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 10px;
}
.brand-mark {
  width: 32px;
  height: 32px;
  display: block;
}
.nav-links { display: flex; gap: 10px; flex-wrap: wrap; }
.nav-links a { color: #e5e7eb; text-decoration: none; font-size: 14px; }
.nav-links a:hover { color: #fff; }

#toggle-theme {
  background: transparent;
  border: none;
  color: #e5e7eb;
  font-size: 18px;
  cursor: pointer;
  padding: 6px;
  border-radius: 50%;
  transition: background 0.2s, color 0.2s;
}

#toggle-theme:hover {
  background: rgba(255, 255, 255, 0.1);
  color: #fff;
}

#toggle-theme:focus {
  outline: 2px solid #3b82f6;
  outline-offset: 2px;
}

.page-shell {
  max-width: 1120px;
  margin: 0 auto;
  padding: 24px 20px 48px;
}
.panel {
  background: var(--panel);
  border-radius: 18px;
  padding: 24px;
  box-shadow: 0 10px 30px rgba(15, 23, 42, 0.08);
}
.hero {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 20px;
  align-items: center;
}
.hero h1 { margin: 0 0 10px; font-size: 34px; }
.hero p { color: var(--muted); }

.cta-row,
.share-row,
.mini-links,
.tabs,
.footer-links {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.btn,
.tag,
.share-link,
.tabs a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 11px 18px;
  border-radius: 999px;
  text-decoration: none;
  border: 1px solid transparent;
  cursor: pointer;
  font-size: 14px;
  font-weight: 500;
  transition: all 0.2s;
}

.btn {
  background: var(--primary);
  color: white;
}

.btn-primary {
  background: var(--primary);
  color: white;
  border: 0;
}

.btn:hover {
  opacity: 0.9;
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
}

.btn:focus {
  outline: none;
  box-shadow: 0 0 0 4px var(--primary-soft);
}

button.btn { 
  border: 0; 
  padding: 12px 20px;
  font-size: 15px;
}

.btn-secondary,
.tag,
.share-link,
.tabs a {
  background: var(--secondary);
  color: var(--secondary-text);
  border-color: var(--secondary-border);
}

.btn-secondary:hover,
.tag:hover,
.share-link:hover,
.tabs a:hover {
  background: #dbeafe;
  border-color: #93c5fd;
}

.tabs { margin: 16px 0 24px; }
.tabs a.active {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.sim-card,
.content-block,
.ad-slot,
.faq-item {
  background: var(--panel);
  border-radius: 16px;
  padding: 18px;
  border: 1px solid var(--border);
}

.sim-card h2,
.sim-card h3,
.content-block h2 { margin-top: 0; }

.faq-item {
  padding: 20px;
  transition: border-color 0.2s, background 0.2s;
}
.faq-item:hover {
  border-color: var(--primary);
  background: var(--primary-soft);
}
.faq-item strong {
  display: block;
  font-size: 15px;
  margin-bottom: 8px;
  color: var(--text);
}
.faq-item p {
  margin: 0;
  font-size: 13px;
}
.muted { color: var(--muted); }
.result-note { margin: 16px 0 0; }
.ad-slot {
  background: #fff7ed;
  border: 1px dashed #fb923c;
  color: #9a3412;
  text-align: center;
  min-height: 96px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 18px 0;
}

.form-stack { display: grid; gap: 16px; }
.form-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  margin-top: 20px;
  margin-bottom: 16px;
}
.form-grid.compact { grid-template-columns: 1fr; }
#composto-campos-simples,
#composto-campos-avancado {
  display: contents;
}
.form-row {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.form-row.full-width {
  grid-column: 1 / -1;
}
.form-grid > .error-box {
  grid-column: 1 / -1;
}
.form-row label {
  font-weight: 600;
  font-size: 15px;
  color: var(--text);
  margin: 0;
}
.form-row input,
.form-row small {
  margin: 0;
}
.form-row small {
  font-size: 13px;
  color: var(--muted);
  line-height: 1.4;
}
.form-row.checkbox-row {
  flex-direction: row;
  align-items: flex-start;
  gap: 10px;
  margin-top: 12px;
}
.form-row.checkbox-row input {
  margin-top: 4px;
  cursor: pointer;
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}
.form-row.checkbox-row label {
  font-weight: 500;
  cursor: pointer;
  margin: 0;
}
.form-row.checkbox-row small {
  grid-column: 2;
  margin-left: 28px;
}
label {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 14px;
  margin: 0;
}
input[type="number"],
input[type="text"],
select {
  padding: 11px 13px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--panel);
  color: var(--text);
  font-size: 15px;
  transition: border-color 0.2s, box-shadow 0.2s;
}
input:focus,
select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-soft);
}
input::placeholder {
  color: var(--muted);
  opacity: 0.7;
}
input.input-error {
  border-color: var(--danger-text);
  background: var(--danger-bg);
}
input.input-error:focus {
  outline: none;
  border-color: var(--danger-text);
  box-shadow: 0 0 0 3px rgba(153, 27, 27, 0.1);
}

.summary {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
  margin: 32px 0;
}
.card {
  background: var(--primary-soft);
  border-radius: 14px;
  padding: 22px;
  border: 1px solid var(--border);
  text-align: center;
  transition: transform 0.2s, box-shadow 0.2s;
}
.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 24px rgba(37, 99, 235, 0.12);
}
.card small {
  display: block;
  font-size: 13px;
  color: var(--muted);
  font-weight: 500;
  margin-bottom: 12px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
.card strong {
  font-size: 24px;
  color: var(--primary);
  display: block;
  line-height: 1.2;
}
.error-box {
  background: var(--danger-bg);
  color: var(--danger-text);
  border-radius: 12px;
  padding: 12px 16px;
  margin: 16px 0;
}
.error-box ul {
  margin: 8px 0 0;
  padding-left: 18px;
}
.table-wrap { overflow-x: auto; }
.chart-block {
  margin: 18px 0;
  padding: 12px;
  border-radius: 14px;
  border: 1px solid var(--border);
  background: var(--panel);
}
.chart-block canvas {
  display: block;
  width: 100% !important;
  height: 320px !important;
}
table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 16px;
}
th, td {
  padding: 10px;
  border-bottom: 1px solid var(--border);
  text-align: left;
}

.site-footer {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 20px 28px;
  color: var(--muted);
}
.footer-box {
  background: #fff;
  border-radius: 16px;
  padding: 18px;
  border: 1px solid var(--border);
}
.section-stack { display: grid; gap: 18px; margin-top: 15px;}
.faq-list { display: grid; gap: 12px; }
.is-hidden { display: none !important; }

@media (max-width: 900px) {
  .hero,
  .grid-3,
  .form-grid,
  .summary {
    grid-template-columns: 1fr;
  }
  .summary {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 640px) {
  .form-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }
  .form-row {
    gap: 6px;
  }
  .form-row label {
    font-size: 14px;
  }
  .summary {
    grid-template-columns: 1fr;
    gap: 14px;
  }
  .card {
    padding: 18px;
  }
  .card strong {
    font-size: 20px;
  }
  .grid-3 {
    grid-template-columns: 1fr;
  }
  .panel {
    padding: 18px;
    border-radius: 12px;
  }
  .page-shell {
    padding: 16px 16px 32px;
  }
  button.btn {
    width: 100%;
  }
}