:root {
  --bg: #f4f5f7;
  --fg: #1c1f23;
  --muted: #6b7280;
  --border: #d8dbe0;
  --accent: #1f4ed8;
  --ok-bg: #e7f6ec;
  --ok-fg: #136a2e;
  --err-bg: #fdeaea;
  --err-fg: #9b1c1c;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  font-size: 16px;
  line-height: 1.5;
}

h1, h2 { margin: 0 0 0.5rem; }
h1 { font-size: 1.5rem; }
h2 { font-size: 1.15rem; }
p { margin: 0 0 1rem; }
code { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 0.92em; }

.muted { color: var(--muted); font-size: 0.92rem; }

.card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.5rem;
  max-width: 520px;
  margin: 2rem auto;
  box-shadow: 0 1px 2px rgba(0,0,0,0.04);
}

body.login {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
}
body.login .card { margin: 1rem; width: 100%; }

.topbar {
  background: #fff;
  border-bottom: 1px solid var(--border);
  padding: 0.75rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.topbar h1 { font-size: 1.1rem; }
.topbar form { display: flex; align-items: center; gap: 0.75rem; margin: 0; }

form label {
  display: block;
  margin-bottom: 0.85rem;
  font-size: 0.92rem;
  color: var(--muted);
}
form input[type="text"],
form input[type="password"],
form input[type="file"] {
  display: block;
  margin-top: 0.25rem;
  width: 100%;
  padding: 0.55rem 0.7rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  font: inherit;
  color: var(--fg);
  background: #fff;
}
form input:focus { outline: 2px solid var(--accent); outline-offset: 1px; }

button {
  background: var(--accent);
  color: #fff;
  border: 0;
  border-radius: 6px;
  padding: 0.6rem 1.1rem;
  font: inherit;
  font-weight: 500;
  cursor: pointer;
}
button:hover { filter: brightness(1.05); }
button.link {
  background: transparent;
  color: var(--accent);
  padding: 0.2rem 0.4rem;
  font-weight: 400;
}

.alert {
  border-radius: 6px;
  padding: 0.75rem 1rem;
  margin: 1rem 0;
  font-size: 0.95rem;
}
.alert.ok  { background: var(--ok-bg);  color: var(--ok-fg);  border: 1px solid #b9e2c6; }
.alert.err { background: var(--err-bg); color: var(--err-fg); border: 1px solid #f3c2c2; }

#result { margin-top: 1rem; }

.status {
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.75rem 1rem;
  margin-top: 0.5rem;
  background: #fff;
}
.status.ok  { background: var(--ok-bg);  color: var(--ok-fg);  border-color: #b9e2c6; }
.status.err { background: var(--err-bg); color: var(--err-fg); border-color: #f3c2c2; }

.spinner {
  display: inline-block;
  width: 0.9em;
  height: 0.9em;
  margin-right: 0.4em;
  border: 2px solid currentColor;
  border-top-color: transparent;
  border-radius: 50%;
  vertical-align: -0.15em;
  animation: spin 0.9s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }