:root {
  --ink: #1A1A2E;
  --bg: #FAFAFB;
  --muted: #6B6B7A;
  --accent: #1A1A2E;
  --ok: #0A7A5E;
  --err: #C0392B;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Inter', Roboto, 'Helvetica Neue', Arial, sans-serif;
  font-size: 16px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

.hero {
  max-width: 560px;
  margin: 0 auto;
  padding: 64px 24px 32px;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  min-height: 100vh;
}

.logo-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  margin-bottom: 24px;
}

.logo {
  width: 140px;
  height: 140px;
  display: block;
}

.brand {
  font-size: 36px;
  font-weight: 800;
  letter-spacing: -0.5px;
  margin: 0;
  color: var(--ink);
}

.tagline {
  font-size: 34px;
  font-weight: 700;
  line-height: 1.15;
  margin: 24px 0 12px;
  letter-spacing: -0.5px;
}

.sub {
  font-size: 17px;
  color: var(--muted);
  margin: 0 0 36px;
  max-width: 480px;
}

.form {
  width: 100%;
  max-width: 420px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 16px;
}

.form input {
  width: 100%;
  padding: 14px 16px;
  font-size: 16px;
  border: 1.5px solid #d8d8e0;
  border-radius: 10px;
  background: #fff;
  color: var(--ink);
  outline: none;
  transition: border 0.15s;
}

.form input:focus {
  border-color: var(--ink);
}

.form button {
  margin-top: 6px;
  padding: 14px 20px;
  font-size: 16px;
  font-weight: 700;
  border: none;
  border-radius: 10px;
  background: var(--ink);
  color: #fff;
  cursor: pointer;
  transition: transform 0.05s, opacity 0.15s;
}

.form button:hover { opacity: 0.92; }
.form button:active { transform: scale(0.98); }

.status {
  font-size: 14px;
  margin: 8px 0 0;
  min-height: 20px;
  color: var(--muted);
}
.status.ok { color: var(--ok); }
.status.err { color: var(--err); }

footer {
  margin-top: auto;
  padding-top: 48px;
  font-size: 13px;
  color: var(--muted);
}
footer .dot { margin: 0 8px; }
footer a {
  color: var(--muted);
  text-decoration: none;
}
footer a:hover { color: var(--ink); }

@media (max-width: 520px) {
  .hero { padding: 40px 20px 24px; }
  .logo { width: 110px; height: 110px; }
  .brand { font-size: 30px; }
  .tagline { font-size: 26px; }
  .sub { font-size: 15px; margin-bottom: 28px; }
}

@media (max-width: 360px) {
  .hero { padding: 28px 16px 20px; }
  .logo { width: 92px; height: 92px; }
  .brand { font-size: 26px; }
  .tagline { font-size: 22px; }
  .sub { font-size: 14px; margin-bottom: 22px; }
  .form input, .form button { padding: 12px 14px; font-size: 15px; }
}

@media (max-height: 600px) and (orientation: landscape) {
  .hero { min-height: auto; padding: 24px 24px 16px; }
  .logo { width: 80px; height: 80px; }
  .brand { font-size: 24px; }
  .tagline { font-size: 22px; margin: 12px 0 8px; }
  .sub { margin-bottom: 16px; }
  footer { padding-top: 20px; }
}

@media (min-width: 1600px) {
  .hero { max-width: 640px; padding-top: 96px; }
  .brand { font-size: 42px; }
  .tagline { font-size: 40px; }
  .sub { font-size: 19px; }
}