:root {
  --bg: #f4f2ee;
  --fg: #1d1d1f;
  --accent: #1f6feb;
  --muted: #6e6e73;
  --panel: #ffffff;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "IBM Plex Sans", "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--fg);
}

.app {
  max-width: 820px;
  margin: 48px auto;
  padding: 0 20px 40px;
}

header {
  margin-bottom: 24px;
}

h1 {
  margin: 0 0 8px;
}

.sub {
  color: var(--muted);
  margin: 0;
}

.panel {
  background: var(--panel);
  border-radius: 12px;
  padding: 20px;
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.06);
}

label {
  display: block;
  margin-bottom: 12px;
  font-size: 14px;
  color: var(--muted);
}

input {
  width: 100%;
  padding: 10px;
  border-radius: 8px;
  border: 1px solid #ddd;
  margin-top: 6px;
  font-size: 14px;
}

button {
  background: var(--accent);
  color: #fff;
  border: 0;
  border-radius: 8px;
  padding: 10px 16px;
  font-size: 14px;
  cursor: pointer;
}

button:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.toolbar {
  display: flex;
  gap: 8px;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
}

.file-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.file-item {
  display: grid;
  grid-template-columns: 1fr auto auto;
  gap: 12px;
  align-items: center;
  padding: 10px 0;
  border-bottom: 1px solid #eee;
}

.msg {
  margin-top: 12px;
  font-size: 13px;
  color: var(--muted);
}

.msg.error {
  color: #b42318;
}

.msg.ok {
  color: #027a48;
}

.hidden {
  display: none;
}

@media (max-width: 600px) {
  .file-item {
    grid-template-columns: 1fr;
  }
  .toolbar {
    flex-direction: column;
    align-items: flex-start;
  }
}