:root {
  --sky: #dfe9f3;
  --ink: #1d2a3a;
  --blue: #2f6fed;
  --blue-dark: #2459c4;
  --line: #c7d3e0;
  --warn: #b3261e;
}
* { box-sizing: border-box; }
html, body { height: 100%; margin: 0; }
body {
  font-family: "Trebuchet MS", "Segoe UI", system-ui, sans-serif;
  color: var(--ink);
  background: linear-gradient(180deg, #cfe0f1 0%, var(--sky) 60%, #f4f7fb 100%);
  display: grid; place-items: center; padding: 1rem;
}
.card {
  width: 100%; max-width: 400px; background: #fff;
  border: 1px solid var(--line); border-radius: 14px;
  padding: 2.25rem 2rem 1.75rem;
}
.logo { display: flex; align-items: center; gap: .6rem; color: var(--blue); font-size: 1.4rem; font-weight: 700; margin-bottom: 1.5rem; }
h1 { margin: 0 0 .25rem; font-size: 1.6rem; }
.sub { margin: 0 0 1.5rem; color: #5a6b7e; }
label { display: block; font-size: .9rem; margin: 1rem 0 .35rem; }
input {
  width: 100%; padding: .7rem .8rem; font-size: 1rem;
  border: 1px solid var(--line); border-radius: 8px; background: #fbfdff;
}
input:focus-visible, button:focus-visible, a:focus-visible { outline: 3px solid #9dbdff; outline-offset: 1px; }
button {
  width: 100%; margin-top: 1.5rem; padding: .8rem; font-size: 1rem; font-weight: 600;
  color: #fff; background: var(--blue); border: 0; border-radius: 8px; cursor: pointer;
  transition: background .15s, transform .25s;
}
button:hover { background: var(--blue-dark); }
button:disabled { opacity: .6; cursor: wait; }
.message {
  min-height: 1.4rem; margin-top: 1.25rem; padding: 0; color: var(--warn); font-size: .95rem; line-height: 1.4;
}
.message.show { padding: .75rem .9rem; background: #fdecea; border-radius: 8px; }
.message.ok { color: #1b6b3a; background: #e6f5ec; }
.forgot { display: inline-block; margin-top: 1rem; color: var(--blue); font-size: .9rem; }
.shake { animation: shake .35s; }
@keyframes shake { 25% { transform: translateX(-6px); } 75% { transform: translateX(6px); } }
@media (prefers-reduced-motion: reduce) { .shake { animation: none; } button { transition: none; } }