:root {
  --bg: #f1f5f9;
  --panel: #ffffff;
  --text: #0f172a;
  --muted: #64748b;
  --line: #e2e8f0;
  --accent: #0369a1;
  --accent-hover: #075985;
  --danger: #b91c1c;
  --danger-bg: #fef2f2;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #070d18;
    --panel: #111a2b;
    --text: #e6edf7;
    --muted: #93a3ba;
    --line: #24334d;
    --accent: #0ea5e9;
    --accent-hover: #38bdf8;
    --danger: #fca5a5;
    --danger-bg: #2a1112;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.5 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}

.card {
  width: 100%;
  max-width: 380px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 32px 28px 24px;
  box-shadow: 0 1px 2px rgba(15, 23, 42, .04), 0 12px 32px rgba(15, 23, 42, .08);
}

.mark {
  width: 52px;
  height: 52px;
  display: grid;
  place-items: center;
  border-radius: 14px;
  background: color-mix(in srgb, var(--accent) 12%, transparent);
  color: var(--accent);
  margin-bottom: 18px;
}

h1 {
  margin: 0 0 4px;
  font-size: 1.3rem;
  letter-spacing: -.015em;
}

.lede {
  margin: 0 0 22px;
  color: var(--muted);
  font-size: 14px;
}

label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 6px;
}

.field { position: relative; }

input {
  width: 100%;
  height: 44px;
  padding: 0 44px 0 12px;
  font: inherit;
  color: inherit;
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 10px;
  outline: none;
  transition: border-color .12s ease, box-shadow .12s ease;
}
input:focus {
  border-color: var(--accent);
  background: var(--panel);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 18%, transparent);
}

#reveal {
  position: absolute;
  right: 5px;
  top: 50%;
  transform: translateY(-50%);
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  border: 0;
  background: transparent;
  color: var(--muted);
  border-radius: 8px;
  cursor: pointer;
}
#reveal:hover { color: var(--text); }
#reveal.on { color: var(--accent); }

.error {
  margin: 10px 0 0;
  padding: 9px 11px;
  border-radius: 9px;
  background: var(--danger-bg);
  color: var(--danger);
  font-size: 13.5px;
  border: 1px solid color-mix(in srgb, var(--danger) 25%, transparent);
}

.submit {
  width: 100%;
  height: 44px;
  margin-top: 18px;
  border: 0;
  border-radius: 10px;
  background: var(--accent);
  color: #fff;
  font: inherit;
  font-weight: 600;
  cursor: pointer;
  transition: background .12s ease;
}
.submit:hover:not(:disabled) { background: var(--accent-hover); }
.submit:disabled { opacity: .65; cursor: default; }

.foot {
  margin: 20px 0 0;
  padding-top: 16px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 12.5px;
  text-align: center;
}