:root {
  color-scheme: light;
  --bg: #f7f8fa;
  --panel: #ffffff;
  --text: #17202a;
  --muted: #657080;
  --line: #d9dee7;
  --accent: #1769aa;
  --accent-strong: #0f4f82;
  --bad: #b3261e;
  font-family: "Segoe UI", system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg);
  color: var(--text);
  padding: 24px;
}

.login-box {
  width: 100%;
  max-width: 380px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 32px 28px;
  box-shadow: 0 6px 24px rgba(23, 32, 42, 0.08);
  text-align: center;
}

.login-logo {
  max-height: 44px;
  margin-bottom: 16px;
}

h1 {
  margin: 0 0 4px;
  font-size: 1.35rem;
}

.login-hint {
  margin: 0 0 24px;
  color: var(--muted);
  font-size: 0.9rem;
}

form { text-align: left; }

label {
  display: block;
  margin-bottom: 6px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--muted);
}

input {
  width: 100%;
  padding: 10px 12px;
  margin-bottom: 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  font-size: 1rem;
  background: #fff;
  color: var(--text);
}

input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(23, 105, 170, 0.15);
}

button {
  width: 100%;
  padding: 11px 16px;
  border: 0;
  border-radius: 8px;
  background: var(--accent);
  color: #fff;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
}

button:hover:not(:disabled) { background: var(--accent-strong); }
button:disabled { opacity: 0.6; cursor: default; }

.login-error {
  margin: 18px 0 0;
  padding: 10px 12px;
  border-radius: 8px;
  background: rgba(179, 38, 30, 0.08);
  color: var(--bad);
  font-size: 0.9rem;
}