/* ---- Design tokens ----------------------------------------------------
   Padrão = CLARO em :root. Escuro entra por (a) preferência do sistema
   quando o usuário NÃO fixou claro, e (b) data-theme="dark" quando fixou.
   Assim o servidor controla o tema no 1º paint (sem flash).            */
:root {
  --bg: #f6f7f9;
  --surface: #ffffff;
  --fg: #17181c;
  --muted: #5c6270;
  --border: #e5e7eb;
  --accent: #0e7c86;      /* teal sóbrio */
  --accent-fg: #ffffff;
  --shadow: 0 1px 3px rgba(20, 22, 28, .08);
  --radius: 12px;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0f1115;
    --surface: #171a21;
    --fg: #e8eaed;
    --muted: #9aa2b1;
    --border: #262b35;
    --accent: #2dd4bf;
    --accent-fg: #06231f;
    --shadow: 0 1px 3px rgba(0, 0, 0, .4);
  }
}

:root[data-theme="dark"] {
  --bg: #0f1115;
  --surface: #171a21;
  --fg: #e8eaed;
  --muted: #9aa2b1;
  --border: #262b35;
  --accent: #2dd4bf;
  --accent-fg: #06231f;
  --shadow: 0 1px 3px rgba(0, 0, 0, .4);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.55 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

.topbar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 20px; border-bottom: 1px solid var(--border);
  background: var(--surface);
}
.brand { font-weight: 700; letter-spacing: .3px; color: var(--fg); text-decoration: none; }

.theme-toggle { display: flex; gap: 4px; }
.theme-toggle a {
  font-size: 13px; text-decoration: none; color: var(--muted);
  padding: 5px 10px; border: 1px solid var(--border); border-radius: 999px;
}
.theme-toggle a.on { color: var(--accent-fg); background: var(--accent); border-color: var(--accent); }

.container { max-width: 720px; margin: 0 auto; padding: 32px 20px; }

.eyebrow { color: var(--accent); font-weight: 600; font-size: 13px; text-transform: uppercase; letter-spacing: .8px; margin: 0 0 6px; }
.hero h1 { font-size: 40px; margin: 0 0 8px; }
.lede { color: var(--muted); font-size: 18px; margin: 0 0 24px; }

.card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); box-shadow: var(--shadow);
  padding: 18px 20px; margin: 16px 0;
}
.card h2 { margin: 0 0 8px; font-size: 18px; }
.muted-card { background: transparent; box-shadow: none; }
.small { color: var(--muted); font-size: 14px; margin: 0; }

.foot {
  max-width: 720px; margin: 24px auto; padding: 16px 20px;
  color: var(--muted); font-size: 13px; border-top: 1px solid var(--border);
}

/* topbar direita: auth + tema */
.topbar-right { display: flex; align-items: center; gap: 14px; }
.auth-nav { display: flex; align-items: center; gap: 10px; font-size: 13px; }
.auth-nav .who { color: var(--muted); }
.auth-nav a { color: var(--accent); text-decoration: none; }

/* auth (login/registro/2fa) */
.auth { max-width: 420px; }
.auth h1 { font-size: 28px; margin: 0 0 16px; }
.form { display: flex; flex-direction: column; gap: 14px; }
.form label { display: flex; flex-direction: column; gap: 6px; font-size: 14px; color: var(--muted); }
.form input {
  padding: 10px 12px; font-size: 16px; color: var(--fg);
  background: var(--bg); border: 1px solid var(--border); border-radius: 8px;
}
.form input:focus { outline: 2px solid var(--accent); border-color: var(--accent); }
button, .btn {
  display: inline-block; cursor: pointer; text-decoration: none; text-align: center;
  padding: 10px 16px; font-size: 15px; font-weight: 600; border-radius: 8px;
  background: var(--accent); color: var(--accent-fg); border: 1px solid var(--accent);
}
.btn.ghost { background: transparent; color: var(--accent); }
.cta { display: flex; gap: 10px; margin: 8px 0 4px; }
.erro { color: #b91c1c; background: #fee2e2; border-radius: 8px; padding: 8px 12px; font-size: 14px; }
:root[data-theme="dark"] .erro,
:root:not([data-theme="light"]) .erro { color: #fecaca; background: #3b1113; }
.qr { display: block; width: 200px; height: 200px; margin: 8px 0 16px; border-radius: 8px; background: #fff; padding: 8px; }