:root {
  --bg: #f4f6f9;
  --card: #ffffff;
  --border: #d8dee6;
  --text: #1f2933;
  --muted: #6b7785;
  --primary: #2f6fed;
  --primary-d: #2459c4;
  --error: #d23f3f;
  --success: #1f9d57;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, "PingFang TC", "Microsoft JhengHei", system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
}

.center {
  display: flex;
  justify-content: center;
  align-items: flex-start;
  padding: 32px 16px 64px;
  min-height: 100vh;
}
body.center { align-items: center; }

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 22px;
  background: var(--card);
  border-bottom: 1px solid var(--border);
}
.topbar h1 { font-size: 18px; margin: 0; }

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 26px;
  width: 100%;
  max-width: 440px;
  box-shadow: 0 6px 24px rgba(31, 41, 51, 0.06);
}

.card h1 { margin: 0 0 4px; font-size: 22px; }
.sub { margin: 0 0 18px; color: var(--muted); }

label {
  display: block;
  margin-bottom: 16px;
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
}

input, select, textarea {
  width: 100%;
  margin-top: 6px;
  padding: 10px 12px;
  font-size: 15px;
  font-weight: 400;
  border: 1px solid var(--border);
  border-radius: 9px;
  background: #fff;
  color: var(--text);
}
input:focus, select:focus, textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(47, 111, 237, 0.15);
}
textarea { resize: vertical; }

button {
  width: 100%;
  padding: 12px;
  font-size: 15px;
  font-weight: 700;
  color: #fff;
  background: var(--primary);
  border: none;
  border-radius: 9px;
  cursor: pointer;
}
button:hover { background: var(--primary-d); }
button:disabled { opacity: 0.6; cursor: not-allowed; }

button.ghost {
  width: auto;
  padding: 7px 14px;
  font-size: 13px;
  color: var(--text);
  background: transparent;
  border: 1px solid var(--border);
}
button.ghost:hover { background: var(--bg); }

.error { color: var(--error); font-size: 13px; margin-bottom: 12px; }

.msg {
  margin-top: 16px;
  padding: 12px;
  border-radius: 9px;
  font-size: 14px;
  word-break: break-all;
}
.msg.success { background: #e7f7ee; color: var(--success); }
.msg.error { background: #fdecec; color: var(--error); }
.msg a { color: inherit; font-weight: 700; }