:root {
  --bg: #f4f5f7;
  --card: #ffffff;
  --text: #1c1e21;
  --muted: #6b7280;
  --border: #d9dce1;
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --error-bg: #fdecec;
  --error: #b42318;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111317;
    --card: #1b1e24;
    --text: #e8eaed;
    --muted: #9aa0a6;
    --border: #2e333b;
    --accent: #4f8cff;
    --accent-hover: #6b9fff;
    --error-bg: #3a1d1d;
    --error: #ff8a80;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
h1 { margin: 0; font-size: 1.5rem; }
.muted { color: var(--muted); }
.center { min-height: 100vh; display: grid; place-items: center; padding: 16px; }
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 28px;
  box-shadow: 0 8px 30px rgb(0 0 0 / 0.06);
}
.login { width: 100%; max-width: 360px; display: flex; flex-direction: column; gap: 14px; }
.login .muted { margin: -6px 0 4px; }
.brand { display: flex; align-items: center; gap: 10px; }
.logo {
  display: grid; place-items: center;
  width: 36px; height: 36px; border-radius: 10px;
  background: var(--accent); color: #fff; font-size: 20px;
}
label { display: flex; flex-direction: column; gap: 6px; font-size: 0.9rem; font-weight: 500; }
input {
  font: inherit; padding: 10px 12px;
  border: 1px solid var(--border); border-radius: 8px;
  background: var(--bg); color: var(--text);
}
input:focus { outline: 2px solid var(--accent); outline-offset: 1px; border-color: transparent; }
button {
  font: inherit; font-weight: 600; cursor: pointer;
  padding: 10px 14px; border: 0; border-radius: 8px;
  background: var(--accent); color: #fff;
}
button:hover { background: var(--accent-hover); }
button.ghost { background: transparent; color: var(--text); border: 1px solid var(--border); padding: 6px 12px; }
button.ghost:hover { background: var(--bg); }
.error { margin: 0; padding: 10px 12px; border-radius: 8px; background: var(--error-bg); color: var(--error); font-size: 0.9rem; }
.topbar {
  display: flex; justify-content: space-between; align-items: center; gap: 12px;
  padding: 12px 16px; background: var(--card); border-bottom: 1px solid var(--border);
}
.topbar form { display: flex; align-items: center; gap: 12px; }
.content { max-width: 960px; margin: 0 auto; padding: 24px 16px; }