:root {
  --ink: #12212b;
  --muted: #5b6f7d;
  --line: #c5d4df;
}

* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  min-height: 100%;
  font-family: "Noto Sans TC", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(900px 500px at 10% -10%, #cfe3f0 0%, transparent 55%),
    radial-gradient(700px 400px at 100% 0%, #d5ebe4 0%, transparent 50%),
    #e8eef3;
}

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

.login-card {
  width: min(400px, 100%);
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 16px;
  box-shadow: 0 16px 40px rgba(18, 33, 43, 0.1);
  padding: 28px 24px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.login-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 8px;
}

.login-brand .mark {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  background: linear-gradient(145deg, #0f7a6b, #1d4f8c);
}

.login-brand h1 {
  margin: 0;
  font-family: "Outfit", "Noto Sans TC", sans-serif;
  font-size: 1.25rem;
  font-weight: 800;
}

.login-brand p {
  margin: 2px 0 0;
  color: var(--muted);
  font-size: 0.85rem;
}

label {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 0.85rem;
  font-weight: 700;
}

input {
  font: inherit;
  padding: 11px 12px;
  border-radius: 10px;
  border: 1.5px solid var(--line);
  background: #f7fafc;
}

input:focus {
  outline: none;
  border-color: #1d4f8c;
  background: #fff;
}

.login-error {
  margin: 0;
  color: #c0392b;
  background: #fde8e6;
  border-radius: 8px;
  padding: 8px 10px;
  font-size: 0.85rem;
  font-weight: 600;
}

.login-btn {
  margin-top: 4px;
  border: none;
  cursor: pointer;
  font: inherit;
  font-weight: 800;
  padding: 12px 16px;
  border-radius: 10px;
  color: #fff;
  background: linear-gradient(145deg, #0f7a6b, #166f63);
}

.login-btn:disabled {
  opacity: 0.6;
  cursor: wait;
}