:root {
  color-scheme: light dark;
  --bg: #f6f8fb;
  --surface: #ffffff;
  --border: #e4e9f0;
  --text: #1a2233;
  --body: #384252;
  --muted: #667085;
  --brand: #3b5bdb;
  --brand-dark: #2f49b8;
  --brand-soft: #eef2ff;
  --brand-soft2: #e0e7ff;
  --brand-border: #dbe3ff;
  --ok: #12b76a;
  --radius: 14px;
  --shadow: 0 1px 3px rgba(16, 24, 40, .06), 0 8px 24px rgba(16, 24, 40, .04);
  --shadow-hover: 0 8px 30px rgba(16, 24, 40, .10);
  --ad-a: #fafbfc;
  --ad-b: #f4f6f9;
  --maxw: 900px;
  font-synthesis: none;
}

/* ---- Tema escuro automático (respeita o sistema; sem JS, sem flash) ---- */
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f141f;
    --surface: #171e2b;
    --border: #2a3446;
    --text: #e7ebf2;
    --body: #c3cad8;
    --muted: #98a3b7;
    --brand: #6d8bff;
    --brand-dark: #5878f0;
    --brand-soft: #1d2740;
    --brand-soft2: #26325a;
    --brand-border: #2f3d63;
    --shadow: 0 1px 3px rgba(0, 0, 0, .5), 0 8px 24px rgba(0, 0, 0, .35);
    --shadow-hover: 0 10px 30px rgba(0, 0, 0, .55);
    --ad-a: #141b28;
    --ad-b: #1a2231;
  }
}

* { box-sizing: border-box; }

/* background no html (não só no body): elimina o vão de cor no overscroll
   ("repique") no topo e abaixo do footer. */
html { -webkit-text-size-adjust: 100%; background: var(--bg); }

body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
}

a { color: var(--brand); text-decoration: none; }
a:hover { text-decoration: underline; }

.container { max-width: var(--maxw); margin: 0 auto; padding: 0 20px; }

/* Header / toolbar */
.site-header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 30;
}
.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  height: 60px;
}
.logo {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-weight: 800;
  font-size: 1.18rem;
  color: var(--text);
  letter-spacing: -.02em;
}
.logo::before {
  content: "";
  width: 26px;
  height: 26px;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--brand), var(--brand-dark));
  -webkit-mask: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="none" stroke="white" stroke-width="2.2" stroke-linecap="round" stroke-linejoin="round"><path d="M14.7 6.3a4 4 0 0 0-5.4 5.4L3 18v3h3l6.3-6.3a4 4 0 0 0 5.4-5.4l-2.6 2.6-2-2 2.6-2.6z"/></svg>') center/16px no-repeat;
  mask: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="none" stroke="white" stroke-width="2.2" stroke-linecap="round" stroke-linejoin="round"><path d="M14.7 6.3a4 4 0 0 0-5.4 5.4L3 18v3h3l6.3-6.3a4 4 0 0 0 5.4-5.4l-2.6 2.6-2-2 2.6-2.6z"/></svg>') center/16px no-repeat;
  flex: none;
}
.logo span { color: var(--brand); }
.nav { display: flex; align-items: center; gap: 4px; }
.nav a {
  color: var(--muted);
  font-weight: 600;
  font-size: .94rem;
  padding: 8px 12px;
  border-radius: 9px;
  line-height: 1;
  transition: color .12s, background .12s;
}
.nav a:hover { color: var(--text); background: var(--bg); }
.nav .nav-support {
  color: var(--brand-dark);
  background: var(--brand-soft);
  border: 1px solid var(--brand-border);
  margin-left: 6px;
}
.nav .nav-support:hover { background: var(--brand-soft2, var(--brand-soft)); color: var(--brand-dark); }

/* Hero */
.hero { text-align: center; padding: 54px 0 32px; }
.hero h1 { font-size: clamp(1.8rem, 4vw, 2.6rem); margin: 0 0 12px; letter-spacing: -.03em; }
.hero p { color: var(--muted); font-size: 1.1rem; max-width: 620px; margin: 0 auto; }

/* Tool grid */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 16px;
  margin: 28px 0 40px;
}
.card {
  display: block;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow);
  transition: transform .12s ease, box-shadow .12s ease;
}
.card:hover { transform: translateY(-3px); text-decoration: none; box-shadow: var(--shadow-hover); }
.card .ico { display: block; font-size: 1.8rem; line-height: 1; margin-bottom: 8px; }
.card h3 { margin: 10px 0 4px; font-size: 1.05rem; color: var(--text); }
.card p { margin: 0; color: var(--muted); font-size: .9rem; }

/* Homepage: busca + categorias */
.home-search { max-width: 540px; margin: 26px auto 0; }
.home-search input { width: 100%; box-shadow: var(--shadow); }
.cat { margin: 44px 0 0; }
.cat-title {
  display: flex; align-items: center; gap: 10px;
  font-size: 1.3rem; letter-spacing: -.01em; margin: 0 0 16px; color: var(--text);
}
.cat-title .n {
  font-size: .78rem; font-weight: 700; color: var(--muted);
  background: var(--bg); border: 1px solid var(--border);
  border-radius: 999px; padding: 2px 9px; line-height: 1.4;
}
.cat .grid { margin: 0 0 8px; }
.home-empty { text-align: center; color: var(--muted); padding: 54px 0; font-size: 1.05rem; }

/* Tool page */
.tool-main { padding: 32px 0 60px; }
.breadcrumb { color: var(--muted); font-size: .88rem; margin-bottom: 18px; }
.tool-head h1 { font-size: clamp(1.6rem, 3.5vw, 2.1rem); margin: 0 0 8px; letter-spacing: -.02em; }
.tool-head p.lead { color: var(--muted); font-size: 1.05rem; margin: 0 0 24px; }

.panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
}

label { display: block; font-weight: 600; font-size: .92rem; margin: 0 0 6px; color: var(--text); }
.hint { color: var(--muted); font-size: .85rem; font-weight: 400; }

input[type="text"], input[type="number"], input[type="date"], input[type="search"],
input[type="time"], input[type="email"], input[type="password"], input[type="color"],
textarea, select {
  width: 100%;
  padding: 12px 14px;
  font-size: 1rem;
  font-family: inherit;
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  outline: none;
  transition: border-color .12s, box-shadow .12s;
}
input:focus, textarea:focus, select:focus {
  border-color: var(--brand);
  box-shadow: 0 0 0 3px var(--brand-soft);
}
textarea { resize: vertical; min-height: 120px; }
::placeholder { color: var(--muted); opacity: .8; }

.field { margin-bottom: 18px; }
.row { display: flex; gap: 14px; flex-wrap: wrap; }
.row > .field { flex: 1; min-width: 160px; }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--brand);
  color: #fff;
  font-weight: 700;
  font-size: 1rem;
  border: none;
  border-radius: 10px;
  padding: 12px 22px;
  cursor: pointer;
  transition: background .12s;
}
.btn:hover { background: var(--brand-dark); }
.btn.secondary { background: var(--brand-soft); color: var(--brand-dark); }
.btn.secondary:hover { background: var(--brand-soft2); }

.result {
  margin-top: 20px;
  padding: 18px;
  background: var(--brand-soft);
  border: 1px solid var(--brand-border);
  border-radius: 10px;
  font-size: 1.05rem;
  color: var(--text);
}
.result.big { font-size: 1.6rem; font-weight: 700; text-align: center; word-break: break-all; }

.checkbox { display: flex; align-items: center; gap: 10px; margin-bottom: 10px; font-weight: 500; }
.checkbox input { width: 18px; height: 18px; accent-color: var(--brand); }

.range-row { display: flex; align-items: center; gap: 14px; }
.range-row input[type="range"] { flex: 1; accent-color: var(--brand); }
.range-val { font-weight: 700; min-width: 42px; text-align: right; }

/* Ad slot */
.ad-slot {
  margin: 26px 0;
  min-height: 90px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--muted);
  font-size: .8rem;
  border: 1px dashed var(--border);
  border-radius: 10px;
  background: repeating-linear-gradient(45deg, var(--ad-a), var(--ad-a) 10px, var(--ad-b) 10px, var(--ad-b) 20px);
}

/* SEO content block */
.article { margin-top: 40px; }
.article h2 { font-size: 1.3rem; margin: 28px 0 10px; letter-spacing: -.01em; color: var(--text); }
.article h3 { font-size: 1.05rem; margin: 20px 0 8px; color: var(--text); }
.article p, .article li { color: var(--body); }
.faq details {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 4px 16px;
  margin-bottom: 10px;
}
.faq summary { cursor: pointer; font-weight: 600; padding: 12px 0; }

/* Related tools */
.related { margin-top: 44px; }
.related h2 { font-size: 1.2rem; margin-bottom: 14px; }

/* Footer */
.site-footer {
  border-top: 1px solid var(--border);
  background: var(--surface);
  padding: 30px 0;
  margin-top: 40px;
  color: var(--muted);
  font-size: .9rem;
}
.site-footer .container { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px; }
.site-footer a { color: var(--muted); }

.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: var(--text);
  color: var(--bg);
  padding: 12px 20px;
  border-radius: 10px;
  font-weight: 600;
  opacity: 0;
  pointer-events: none;
  transition: opacity .2s, transform .2s;
  z-index: 90;
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

@media (max-width: 600px) {
  .hero { padding: 36px 0 20px; }
}
@media (max-width: 520px) {
  .site-header .container { gap: 8px; }
  .nav { gap: 2px; }
  .nav a { padding: 7px 9px; font-size: .88rem; }
  .nav .nav-home { display: none; } /* redundante com o logo no mobile */
  .nav .nav-support { margin-left: 2px; }
  .logo { font-size: 1.08rem; }
}

/* Caixa de aviso (ex.: "apenas para teste") — temável */
.aviso {
  background: #fff8e6;
  border: 1px solid #f0d59a;
  color: #7a5b00;
  border-radius: 10px;
  padding: 12px 16px;
  margin-bottom: 20px;
  font-size: .92rem;
  line-height: 1.5;
}
@media (prefers-color-scheme: dark) {
  .aviso { background: #2a2110; border-color: #4a3a14; color: #e6b566; }
}