:root {
  --paper: #f7f5f0;
  --ink: #0f3d3e;
  --muted: rgba(15, 61, 62, 0.62);
  --accent: #0d9488;
  --line: #d6d0c4;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  background: var(--paper);
  color: var(--ink);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

.card {
  width: 100%;
  max-width: 420px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 22px;
  padding: 32px 28px;
  text-align: center;
}

.mark {
  width: 56px;
  height: 56px;
  margin: 0 auto 18px;
  border-radius: 16px;
  background: var(--accent);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 26px;
  font-weight: 800;
}

h1 { font-size: 22px; margin: 0 0 8px; letter-spacing: -0.3px; }

p { margin: 0 0 20px; color: var(--muted); line-height: 1.5; font-size: 15px; }

.btn {
  display: block;
  width: 100%;
  padding: 14px 18px;
  margin-top: 10px;
  border-radius: 14px;
  border: 0;
  background: var(--accent);
  color: #fff;
  font: inherit;
  font-weight: 700;
  font-size: 15px;
  text-decoration: none;
  cursor: pointer;
}

.btn.secondary {
  background: transparent;
  color: var(--ink);
  border: 1px solid var(--line);
}

.btn[disabled] { opacity: 0.6; cursor: default; }

.hidden { display: none; }

.small { font-size: 13px; margin-top: 18px; margin-bottom: 0; }

a.link { color: var(--accent); }