:root {
  color-scheme: dark;
  --bg: #0b0e10;
  --panel: #121719;
  --border: #293236;
  --text: #edf3f3;
  --muted: #8d9b9f;
  --cyan: #4fc8d8;
  --green: #45d596;
  --red: #f17178;
  font-family: Inter, "Segoe UI", Arial, sans-serif;
}

* { box-sizing: border-box; }

body {
  min-width: 320px;
  min-height: 100vh;
  margin: 0;
  color: var(--text);
  background:
    linear-gradient(rgba(79, 200, 216, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(79, 200, 216, 0.045) 1px, transparent 1px),
    var(--bg);
  background-size: 40px 40px;
}

.login-shell {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
}

.login-panel {
  width: min(440px, 100%);
  padding: 32px;
  border: 1px solid var(--border);
  border-top: 3px solid var(--cyan);
  background: rgba(18, 23, 25, 0.97);
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.38);
}

.brand-mark {
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  margin-bottom: 24px;
  color: #071012;
  background: var(--cyan);
  font-weight: 900;
}

.eyebrow {
  color: var(--cyan);
  font: 700 10px/1.2 "Cascadia Mono", Consolas, monospace;
}

h1 {
  margin: 8px 0 10px;
  font-size: clamp(30px, 7vw, 44px);
  letter-spacing: 0;
}

p, footer {
  color: var(--muted);
  line-height: 1.55;
}

form { margin-top: 28px; }

label {
  display: block;
  margin-bottom: 8px;
  color: var(--muted);
  font-size: 12px;
}

input {
  width: 100%;
  height: 48px;
  padding: 0 13px;
  border: 1px solid var(--border);
  border-radius: 4px;
  outline: 0;
  color: var(--text);
  background: #0d1113;
  font: 600 13px/1 "Cascadia Mono", Consolas, monospace;
}

input:focus { border-color: var(--cyan); }

button {
  width: 100%;
  height: 46px;
  margin-top: 12px;
  border: 0;
  border-radius: 4px;
  color: #071012;
  background: var(--green);
  font-weight: 800;
  cursor: pointer;
}

button:disabled { opacity: 0.55; cursor: wait; }

.login-error {
  margin-top: 14px;
  padding: 10px 12px;
  border-left: 3px solid var(--red);
  color: #ffc5c8;
  background: rgba(241, 113, 120, 0.08);
  font-size: 12px;
}

.hidden { display: none; }

footer {
  margin-top: 26px;
  border-top: 1px solid var(--border);
  padding-top: 16px;
  font-size: 11px;
}

@media (max-width: 520px) {
  .login-shell { padding: 12px; }
  .login-panel { padding: 24px 18px; }
}