:root {
  --bg: #f3f5f7;
  --panel: #ffffff;
  --text: #1f2937;
  --muted: #4b5563;
  --primary: #0f766e;
  --primary-hover: #0d5f58;
  --danger: #b91c1c;
  --border: #d1d5db;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: linear-gradient(135deg, #eef2f6 0%, #e9f6f2 100%);
  color: var(--text);
  font-family: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
}

.container {
  width: min(880px, 92vw);
  margin: 32px auto;
}

h1 {
  margin: 0;
  font-size: 2rem;
}

.sub {
  margin-top: 8px;
  color: var(--muted);
}

.card {
  margin-top: 18px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 18px;
  box-shadow: 0 8px 30px rgba(31, 41, 55, 0.08);
}

.hidden {
  display: none;
}

.field {
  display: grid;
  gap: 8px;
  margin-bottom: 14px;
}

input[type="file"],
select {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px 12px;
  font-size: 0.95rem;
}

button,
.button {
  border: none;
  border-radius: 10px;
  padding: 10px 16px;
  background: var(--primary);
  color: #fff;
  cursor: pointer;
  text-decoration: none;
  font-size: 0.95rem;
  transition: background 0.2s ease;
}

button:hover,
.button:hover {
  background: var(--primary-hover);
}

.actions {
  margin-top: 14px;
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.danger {
  background: var(--danger);
}

.danger:hover {
  background: #991b1b;
}

.checkbox-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 8px;
}

.message {
  min-height: 1.5em;
  margin-top: 10px;
  color: #0f5132;
}

.message.error {
  color: #842029;
}

@media (max-width: 600px) {
  .container {
    width: 94vw;
    margin: 20px auto;
  }

  h1 {
    font-size: 1.6rem;
  }
}