:root {
  --ink: #172033; --muted: #5b6577; --line: #d5dae5; --accent: #2457f5; --accent-ink: #fff; --bad: #b42318; --bad-soft: #fdecea;
  --bg1: #f3f6ff; --bg2: #e6ecf5; --card: #fff;
}
@media (prefers-color-scheme: dark) {
  :root { --ink: #e8ecf5; --muted: #9aa5ba; --line: #3a4560; --accent: #6b8cff; --accent-ink: #0b1020; --bad: #ff8a80; --bad-soft: #3a1c1a;
    --bg1: #121829; --bg2: #0c111d; --card: #1a2236; }
}
* { box-sizing: border-box; }
html, body { height: 100%; }
body { margin: 0; font: 15px/1.45 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; color: var(--ink);
  background: linear-gradient(160deg, var(--bg1) 0%, var(--bg2) 100%); }
.login { min-height: 100%; display: grid; place-items: center; padding: 24px 16px; }
.login__card { width: min(400px, 100%); background: var(--card); border: 1px solid var(--line); border-radius: 16px; padding: 28px 28px 22px;
  box-shadow: 0 18px 50px rgba(16, 24, 40, .14); }
.login__card.is-shake { animation: shake .35s; }
@keyframes shake { 20%, 60% { transform: translateX(-6px); } 40%, 80% { transform: translateX(6px); } }
.login__logo { font-weight: 700; color: var(--accent); letter-spacing: .3px; margin-bottom: 14px; }
h1 { margin: 0 0 4px; font-size: 26px; }
.login__lead { margin: 0 0 20px; color: var(--muted); }
.login__field { display: block; margin: 0 0 14px; }
.login__field > span:first-child { display: block; margin: 0 0 5px; font-size: 13px; font-weight: 600; }
input { width: 100%; font: inherit; color: inherit; background: transparent; border: 1px solid var(--line); border-radius: 10px; padding: 10px 12px; }
input:focus-visible { outline: 2px solid var(--accent); outline-offset: 1px; border-color: var(--accent); }
.login__pw { position: relative; display: block; }
.login__pw input { padding-right: 44px; }
.login__peek { position: absolute; right: 4px; top: 50%; transform: translateY(-50%); border: 0; background: transparent; cursor: pointer;
  width: 36px; height: 36px; border-radius: 8px; font-size: 16px; color: var(--muted); }
.login__peek:hover { background: rgba(120, 130, 160, .15); }
.login__err { min-height: 20px; margin: -2px 0 8px; color: var(--bad); font-size: 13.5px; }
.login__go { width: 100%; border: 0; border-radius: 10px; padding: 11px 14px; font: inherit; font-weight: 700; cursor: pointer;
  background: var(--accent); color: var(--accent-ink); }
.login__go:hover:not(:disabled) { filter: brightness(1.07); }
.login__go:disabled { opacity: .6; cursor: default; }
.login__foot { margin: 16px 0 0; font-size: 12.5px; color: var(--muted); }