* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: #f4f6fb;
  color: #1f2937;
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.container {
  flex: 1;
  max-width: 520px;
  width: 100%;
  margin: 0 auto;
  padding: 32px 20px;
}

.hero { text-align: center; margin-bottom: 24px; }
.hero h1 { font-size: 28px; font-weight: 700; color: #1d4ed8; }
.subtitle { color: #6b7280; margin-top: 8px; font-size: 14px; }

.card {
  background: #fff;
  border-radius: 16px;
  padding: 28px 24px;
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.06);
}

.field { display: block; margin-bottom: 18px; }
.field > span { display: block; font-size: 14px; font-weight: 600; margin-bottom: 8px; color: #374151; }

.field input,
.field textarea {
  width: 100%;
  padding: 11px 12px;
  border: 1px solid #d1d5db;
  border-radius: 10px;
  font-size: 15px;
  outline: none;
  transition: border-color 0.2s;
}
.field input:focus,
.field textarea:focus { border-color: #1d4ed8; }

.slots { display: flex; flex-wrap: wrap; gap: 10px; }
.slot {
  padding: 9px 14px;
  border: 1px solid #d1d5db;
  background: #f9fafb;
  border-radius: 10px;
  cursor: pointer;
  font-size: 14px;
  transition: all 0.15s;
}
.slot:hover { border-color: #1d4ed8; }
.slot.active { background: #1d4ed8; color: #fff; border-color: #1d4ed8; }

.submit-btn {
  width: 100%;
  padding: 13px;
  background: #1d4ed8;
  color: #fff;
  border: none;
  border-radius: 10px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s;
}
.submit-btn:hover { background: #1e40af; }
.submit-btn:disabled { background: #93c5fd; cursor: not-allowed; }

.message { margin-top: 14px; font-size: 14px; text-align: center; min-height: 20px; }
.message.error { color: #dc2626; }
.message.success { color: #16a34a; }

.footer {
  text-align: center;
  padding: 18px;
  font-size: 12px;
  color: #9ca3af;
}
.footer p { margin: 2px 0; }