:root {
  --blue: #4a86f5;
  --blue-strong: #2f6fe4;
  --ink: #1c2434;
  --muted: #6b7488;
  --line: #e4e8f0;
  --danger: #c62f40;
}

* { box-sizing: border-box; }

html, body { margin: 0; height: 100%; }

body {
  display: grid;
  place-items: center;
  padding: 24px;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--ink);
  background:
    radial-gradient(900px 520px at 5% -10%, #d9e8ff 0%, transparent 62%),
    radial-gradient(800px 500px at 100% 110%, #dce8ff 0%, transparent 60%),
    #f2f5fb;
  -webkit-font-smoothing: antialiased;
}

.login { width: 100%; max-width: 420px; }

.login__card {
  padding: 32px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 20px;
  box-shadow: 0 30px 60px -34px rgba(28, 52, 100, 0.45);
}

.login__brand { display: flex; align-items: center; gap: 13px; }

.logo-dot {
  position: relative;
  width: 42px;
  height: 42px;
  border-radius: 13px;
  background: linear-gradient(145deg, #6ea2ff, var(--blue-strong));
  box-shadow: 0 10px 22px -10px rgba(47, 111, 228, 0.85);
}

.logo-dot::after {
  content: "";
  position: absolute;
  inset: 12px;
  border: 2.5px solid #fff;
  border-radius: 7px;
  border-bottom-color: transparent;
}

.login__brand h1 { margin: 0; font-size: 19px; letter-spacing: -0.02em; }

.login__brand p {
  margin: 2px 0 0;
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
}

.login__head { margin: 30px 0 22px; }
.login__head h2 { margin: 0; font-size: 22px; letter-spacing: -0.02em; }
.login__head p { margin: 6px 0 0; font-size: 13px; color: var(--muted); }

.login__form { display: grid; gap: 16px; }

.field { display: grid; gap: 7px; }

.field > span:first-child { font-size: 12px; font-weight: 600; color: #49506a; }

.field input {
  width: 100%;
  height: 44px;
  padding: 0 13px;
  font: inherit;
  font-size: 14px;
  color: var(--ink);
  background: #fbfcfe;
  border: 1px solid var(--line);
  border-radius: 10px;
  outline: none;
  transition: border-color 0.15s, box-shadow 0.15s, background 0.15s;
}

.field input:focus {
  background: #fff;
  border-color: var(--blue);
  box-shadow: 0 0 0 3px rgba(74, 134, 245, 0.16);
}

.password-wrap { position: relative; display: block; }
.password-wrap input { padding-right: 46px; }

.reveal {
  position: absolute;
  top: 50%;
  right: 7px;
  display: grid;
  place-items: center;
  width: 32px;
  height: 32px;
  padding: 0;
  color: #8a93a8;
  background: transparent;
  border: 0;
  border-radius: 8px;
  cursor: pointer;
  transform: translateY(-50%);
}

.reveal:hover { color: var(--blue-strong); background: #eef3fe; }

.reveal svg {
  width: 18px;
  height: 18px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.btn {
  height: 46px;
  font: inherit;
  font-size: 14px;
  font-weight: 600;
  color: #fff;
  background: linear-gradient(180deg, #5b93f7, var(--blue-strong));
  border: 1px solid transparent;
  border-radius: 11px;
  box-shadow: 0 12px 22px -14px rgba(47, 111, 228, 0.95);
  cursor: pointer;
  transition: background 0.15s, transform 0.12s, opacity 0.15s;
}

.btn:hover { background: linear-gradient(180deg, #4d89f6, #2665da); }
.btn:active { transform: translateY(1px); }
.btn:disabled { opacity: 0.6; cursor: progress; transform: none; }

.login__error {
  margin: 0;
  padding: 10px 12px;
  font-size: 12.5px;
  color: var(--danger);
  background: #fdeef0;
  border-radius: 9px;
}

.login__help {
  margin-top: 20px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
  font-size: 12px;
  color: var(--muted);
}

.login__help summary { cursor: pointer; font-weight: 600; color: #49506a; }
.login__help p { margin: 9px 0 0; line-height: 1.55; }

.login__help code {
  padding: 2px 5px;
  font-size: 11px;
  color: #2f405e;
  background: #eef3fe;
  border-radius: 5px;
}

.login__foot {
  margin: 24px 0 0;
  font-size: 10.5px;
  letter-spacing: 0.08em;
  text-align: center;
  text-transform: uppercase;
  color: #a3abbd;
}

@media (max-width: 460px) {
  .login__card { padding: 24px 20px; border-radius: 16px; }
  .login__head { margin-top: 24px; }
}