:root {
  color-scheme: light dark;
  --bg: #f8f9fb;
  --fg: #1f2328;
  --muted: #6b7280;
  --card: #ffffff;
  --border: #e5e7eb;
  --accent: #2563eb;
  --ok: #10b981;
  --err: #ef4444;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1115;
    --fg: #e6e8eb;
    --muted: #9ca3af;
    --card: #181b22;
    --border: #2a2f3a;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans TC", sans-serif;
  background: var(--bg);
  color: var(--fg);
  line-height: 1.5;
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 20px;
  border-bottom: 1px solid var(--border);
  background: var(--card);
}

.topbar h1 { margin: 0; font-size: 18px; }

.user-area { display: flex; align-items: center; gap: 12px; font-size: 14px; }

button {
  font: inherit;
  padding: 6px 14px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--fg);
  cursor: pointer;
}
button:hover { background: var(--bg); }

main {
  max-width: 720px;
  margin: 20px auto;
  padding: 0 16px;
  display: grid;
  gap: 16px;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 16px;
}

.card h2 { margin: 0 0 12px; font-size: 16px; }

.card form { display: flex; gap: 8px; flex-wrap: wrap; }

input[type="text"], input[type="file"] {
  flex: 1;
  min-width: 200px;
  padding: 8px 12px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg);
  color: var(--fg);
  font: inherit;
}

input[type="text"]:focus { outline: 2px solid var(--accent); }

form button[type="submit"] {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

.result-area {
  min-height: 48px;
  padding: 12px;
  border-radius: 6px;
  background: var(--bg);
  border: 1px solid var(--border);
  font-size: 14px;
}

.result-area.ok { border-color: var(--ok); }
.result-area.err { border-color: var(--err); }
.result-area.pending { color: var(--muted); }
.result-area .meta { color: var(--muted); font-size: 12px; margin-top: 6px; }

.recent-list { list-style: none; padding: 0; margin: 0; }
.recent-list li {
  display: grid;
  grid-template-columns: 100px 1fr auto;
  gap: 12px;
  padding: 8px 0;
  border-bottom: 1px solid var(--border);
  font-size: 14px;
}
.recent-list li:last-child { border-bottom: none; }
.recent-list .amt { font-weight: 600; }
.recent-list .vendor { color: var(--fg); }
.recent-list .ts { color: var(--muted); font-size: 12px; }

/* login page */
.login-page {
  display: grid;
  place-items: center;
  min-height: 100vh;
}
.login-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 40px;
  text-align: center;
  min-width: 320px;
}
.login-card h1 { margin: 0; font-size: 24px; }
.login-card .tagline { color: var(--muted); margin: 8px 0 32px; font-size: 14px; }
.google-btn {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 10px 24px;
  border-radius: 6px;
  background: var(--accent);
  color: #fff;
  text-decoration: none;
  font-weight: 500;
}
.google-btn:hover { filter: brightness(1.1); }
.g-icon {
  display: inline-grid;
  place-items: center;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: #fff;
  color: var(--accent);
  font-weight: 700;
  font-family: serif;
}
.login-card .footer { color: var(--muted); font-size: 12px; margin: 32px 0 0; }