* { box-sizing: border-box; }

:root {
  --bg: #121212;
  --card: #181818;
  --txt: #ffffff;
  --txt2: #a7a7a7;
  --borde: #2a2a2a;
  --acento: #1ed760;
  --acento2: #1db954;
  --input: #242424;
  --err: #ff5c5c;
}

body {
  margin: 0;
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: 'Segoe UI', Roboto, Arial, sans-serif;
  background: radial-gradient(1100px 600px at 50% -10%, #1f3a2a 0%, var(--bg) 60%);
  color: var(--txt);
  padding: 24px;
  padding-left: max(24px, env(safe-area-inset-left));
  padding-right: max(24px, env(safe-area-inset-right));
  -webkit-text-size-adjust: 100%;
  -webkit-tap-highlight-color: transparent;
}

.tarjeta {
  width: 100%;
  max-width: 400px;
  background: var(--card);
  border: 1px solid var(--borde);
  border-radius: 16px;
  padding: 32px;
  box-shadow: 0 18px 50px -28px rgba(0, 0, 0, .8);
}

.logo {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  font-size: 1.6rem;
  font-weight: 800;
  margin-bottom: 6px;
}
.logo .icono { font-size: 34px; }

.sub {
  text-align: center;
  color: var(--txt2);
  font-size: .9rem;
  margin-bottom: 24px;
}

label {
  display: block;
  font-size: .82rem;
  font-weight: 600;
  color: var(--txt2);
  margin-bottom: 6px;
}

input {
  width: 100%;
  padding: 12px 13px;
  border: 1px solid var(--borde);
  border-radius: 8px;
  background: var(--input);
  color: var(--txt);
  font-size: 1rem; /* 16px: evita el zoom automático en iOS */
  margin-bottom: 16px;
  outline: none;
}
input:focus {
  border-color: var(--acento);
  box-shadow: 0 0 0 3px rgba(30, 215, 96, .18);
}

.btn {
  width: 100%;
  border: none;
  border-radius: 999px;
  padding: 13px;
  font-size: .95rem;
  font-weight: 800;
  cursor: pointer;
  background: var(--acento);
  color: #06210f;
  transition: transform .1s, background .15s;
}
.btn:hover { background: var(--acento2); transform: scale(1.01); }

.pie {
  text-align: center;
  margin-top: 18px;
  font-size: .88rem;
  color: var(--txt2);
}
.pie a { color: var(--acento); text-decoration: none; font-weight: 700; }

.msg {
  padding: 10px 14px;
  border-radius: 8px;
  font-size: .85rem;
  margin-bottom: 16px;
  background: rgba(255, 92, 92, .12);
  color: var(--err);
  border: 1px solid rgba(255, 92, 92, .3);
}

.pista {
  font-size: .74rem;
  color: var(--txt2);
  margin: -10px 0 14px;
}

@media (max-width: 420px) {
  body { padding: 16px; }
  .tarjeta { padding: 24px 20px; border-radius: 14px; }
  .logo { font-size: 1.4rem; }
  .logo .icono { font-size: 30px; }
}