/* ============================================================
   慈光圖書館捐款頁面樣式
   Google Font: Inter
   ============================================================ */

body {
  margin: 0;
  font-family: 'Inter', 'Noto Sans TC', sans-serif;
  background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
  color: #333;
  display: flex;
  justify-content: center;
  align-items: flex-start;
  min-height: 100vh;
  padding: 2rem 1rem;
  box-sizing: border-box;
}

.container {
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: blur(12px);
  border-radius: 16px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.12);
  padding: 2rem 2.5rem 1.5rem;
  max-width: 460px;
  width: 100%;
}

.title {
  font-size: 1.9rem;
  font-weight: 600;
  margin: 0 0 0.3rem;
  color: #2c3e50;
  text-align: center;
}

.subtitle {
  font-size: 0.95rem;
  margin: 0 0 1.8rem;
  color: #666;
  text-align: center;
}

/* ---- Form Layout ---- */
.donation-form {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.donation-form label {
  font-weight: 500;
  font-size: 0.88rem;
  color: #444;
  margin-top: 0.6rem;
  margin-left: 0.1rem;
}

.required {
  color: #e74c3c;
  margin-left: 2px;
}

/* ---- Inputs, Select, Textarea ---- */
.donation-form input,
.donation-form select,
.donation-form textarea {
  padding: 0.72rem 1rem;
  border: 1.5px solid #dde1e7;
  border-radius: 8px;
  font-size: 0.97rem;
  font-family: 'Inter', 'Noto Sans TC', sans-serif;
  background: #fff;
  color: #333;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
  width: 100%;
  box-sizing: border-box;
}

.donation-form input:focus,
.donation-form select:focus,
.donation-form textarea:focus {
  outline: none;
  border-color: #3498db;
  box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.18);
}

.donation-form select {
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath fill='%23666' d='M1 1l5 5 5-5'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 1rem center;
  padding-right: 2.5rem;
}

.donation-form textarea {
  resize: vertical;
  min-height: 80px;
  line-height: 1.5;
}

.receipt-fieldset {
  border: 1.5px solid #dde1e7;
  border-radius: 8px;
  padding: 0.85rem 1rem;
  margin: 0.8rem 0 0;
}

.receipt-fieldset legend {
  color: #444;
  font-size: 0.88rem;
  font-weight: 500;
  padding: 0 0.35rem;
}

.radio-option {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  margin: 0.45rem 0 0;
}

.donation-form .radio-option input {
  width: auto;
  margin: 0;
}

.receipt-fields {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.receipt-fields[hidden] {
  display: none;
}

/* ---- Submit Button ---- */
.submit-btn {
  background: linear-gradient(90deg, #3498db, #2ecc71);
  color: #fff;
  border: none;
  border-radius: 8px;
  padding: 0.9rem;
  font-size: 1rem;
  font-weight: 600;
  font-family: 'Inter', 'Noto Sans TC', sans-serif;
  cursor: pointer;
  margin-top: 0.8rem;
  transition: transform 0.15s ease, box-shadow 0.2s ease, opacity 0.2s ease;
  letter-spacing: 0.02em;
}

.submit-btn:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: 0 6px 18px rgba(52, 152, 219, 0.35);
}

.submit-btn:active:not(:disabled) {
  transform: translateY(0);
}

.submit-btn:disabled {
  opacity: 0.65;
  cursor: not-allowed;
}

/* ---- Notice ---- */
.notice {
  font-size: 0.78rem;
  color: #999;
  text-align: center;
  margin-top: 1.2rem;
  margin-bottom: 0;
  line-height: 1.5;
}

.loading-msg {
  color: #3498db;
  font-size: 0.9rem;
  text-align: center;
  margin: 0.75rem 0 0;
}

/* ---- Responsive ---- */
@media (max-width: 480px) {
  body {
    padding: 1rem 0.5rem;
  }
  .container {
    padding: 1.5rem 1.2rem;
    border-radius: 12px;
  }
  .title {
    font-size: 1.6rem;
  }
}