:root {
  --bg:#e9eae8; --ink:#20221f; --ink-soft:#63675f; --ink-mute:#9ea399;
  --surface:rgba(255,255,255,0.92); --line:rgba(32,34,31,0.08); --line-strong:rgba(32,34,31,0.13);
  --accent:#2f8f78; --accent-soft:rgba(47,143,120,0.10); --accent-hover:#237563;
  --red:#c4524a;
  --radius:24px; --radius-sm:14px;
  --shadow-soft:0 1px 2px rgba(32,34,31,0.04), 0 20px 50px -22px rgba(32,34,31,0.22);
}
* { margin:0; padding:0; box-sizing:border-box; }
body {
  font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',system-ui,sans-serif;
  color:var(--ink); min-height:100vh; background:#e9eae8;
  -webkit-font-smoothing:antialiased;
  display:flex; align-items:center; justify-content:center; padding:20px;
}
.card {
  position:relative; z-index:1; width:100%; max-width:420px;
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:var(--radius); padding:34px 28px;
  box-shadow:var(--shadow-soft);
}
.logo { text-align:center; margin-bottom:24px; }
.logo-mark {
  display:inline-flex; align-items:center; justify-content:center;
  width:54px; height:54px; border-radius:16px; color:#fff;
  background:linear-gradient(145deg,var(--accent),var(--accent-hover));
  box-shadow:0 10px 24px -10px rgba(47,143,120,0.7); margin-bottom:10px;
}
.logo h1 { font-size:24px; font-weight:700; letter-spacing:-0.02em; color:var(--ink); }
.logo p { color:var(--ink-soft); font-size:13px; margin-top:4px; }
.message { text-align:center; margin:10px 0; font-size:13px; font-weight:600; min-height:22px; }
.message.error { color:var(--red); }
.message.success { color:var(--accent); }
.pin-input {
  width:100%; padding:14px 16px;
  background:#fff; color:var(--ink);
  border:1px solid var(--line-strong); border-radius:var(--radius-sm);
  font-size:20px; text-align:center; letter-spacing:10px; font-weight:600;
  outline:none; margin-bottom:10px; font-family:inherit;
}
.pin-input:first-of-type { letter-spacing:1px; }
.pin-input:focus { border-color:var(--accent); box-shadow:0 0 0 3px var(--accent-soft); }
.pin-input::placeholder { letter-spacing:4px; color:var(--ink-mute); font-weight:400; }
.btn {
  display:block; width:100%; padding:14px; border:none; border-radius:var(--radius-sm);
  font-size:15px; font-weight:600; cursor:pointer; text-align:center; font-family:inherit;
}
.btn-primary { background:var(--accent); color:#fff; margin-top:4px; }
.btn-primary:hover { background:var(--accent-hover); }
.btn-primary:disabled { opacity:0.55; cursor:not-allowed; }
.remember-row {
  display:flex; align-items:center; gap:8px; margin:12px 0 4px;
  font-size:13px; color:var(--ink-soft); justify-content:center;
}
.remember-row input { width:16px; height:16px; accent-color:var(--accent); }
.links { text-align:center; margin-top:18px; display:flex; flex-direction:column; gap:10px; }
.links a { color:var(--ink-soft); text-decoration:none; font-size:13px; font-weight:500; cursor:pointer; }
.links a:hover { color:var(--accent); }
@media (max-width:480px) {
  .card { padding:28px 22px; }
  .logo h1 { font-size:22px; }
}