:root {
  --bg: #f4f5f7;
  --card-bg: #ffffff;
  --text: #1f2430;
  --muted: #5b6270;
  --border: #dcdfe4;
  --accent: #2f6fed;
  --accent-hover: #2558c4;
  --success-bg: #e6f6ec;
  --success-text: #1f7a43;
  --error-bg: #fdecec;
  --error-text: #b42318;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #15171c;
    --card-bg: #1e2128;
    --text: #e8eaed;
    --muted: #9aa0aa;
    --border: #2d313a;
    --accent: #5b8def;
    --accent-hover: #7ba3f2;
    --success-bg: #143322;
    --success-text: #6fd99a;
    --error-bg: #3a1616;
    --error-text: #ff8a80;
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 16px;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, Segoe UI, Roboto, Helvetica, Arial, sans-serif;
  font-size: 14px;
}

.card {
  max-width: 560px;
  margin: 0 auto;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 20px 24px;
}

h1 {
  margin: 0 0 4px;
  font-size: 18px;
}

.subtitle {
  margin: 0 0 18px;
  color: var(--muted);
}

.banner {
  border-radius: 8px;
  padding: 10px 14px;
  margin-bottom: 16px;
  font-size: 13px;
}

.banner-error {
  background: var(--error-bg);
  color: var(--error-text);
}

.banner-success {
  background: var(--success-bg);
  color: var(--success-text);
}

.banner-success p {
  margin: 4px 0;
}

.file-summary {
  margin: 6px 0;
  padding-left: 18px;
}

.status-line {
  font-weight: 600;
}

.field {
  display: block;
  margin-bottom: 14px;
}

.field span {
  display: block;
  margin-bottom: 4px;
  color: var(--muted);
  font-size: 12px;
}

.field input[type="text"],
.field input[type="password"] {
  width: 100%;
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--card-bg);
  color: var(--text);
  font-size: 14px;
}

.dropzone {
  border: 1px dashed var(--border);
  border-radius: 8px;
  padding: 12px;
}

.dropzone input[type="file"] {
  width: 100%;
  color: var(--text);
  font-size: 13px;
}

.file-list {
  display: block;
  margin-top: 6px;
  color: var(--muted);
  font-size: 12px;
}

button[type="submit"] {
  width: 100%;
  padding: 10px 14px;
  border: none;
  border-radius: 6px;
  background: var(--accent);
  color: #ffffff;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
}

button[type="submit"]:hover {
  background: var(--accent-hover);
}

button[type="submit"]:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}