/**
 * 招待クーポン（PC/SP同一・SP基準）
 * コンテナ幅は常に max-width: 480px 相当で統一。
 * 文字サイズはSP基準のみ（PC向けの拡大はなし）。359px以下で詰め表示。
 */

.inv_coupon_page {
  background: #fffaf4;
  color: #3b2b1f;
  font-family: "Hiragino Kaku Gothic ProN", "Yu Gothic", sans-serif;
  line-height: 1.75;
}

.inv_coupon_page h1,
.inv_coupon_page h2,
.inv_coupon_page h3,
.inv_coupon_page h4,
.inv_coupon_page h5 {
  font-weight: 600;
  margin-top: 0;
}

.inv_coupon_container {
  width: 100%;
  max-width: 480px;
  margin: 0 auto;
  padding: 0 16px 56px;
  box-sizing: border-box;
}

.inv_coupon_fv img {
  width: 100%;
  height: auto;
  display: block;
}

.inv_coupon_section {
  margin-top: 40px;
}

.inv_coupon_section_title {
  font-family: inherit;
  font-size: 24px;
  line-height: 1.45;
  margin-bottom: 16px !important;
  color: #5a2f16;
}

.inv_coupon_lead p {
  font-size: 15px;
  margin: 0 0 10px;
}

.inv_coupon_cta {
  margin: 20px 0 24px;
  text-align: center;
}

.inv_coupon_cta a {
  display: inline-block;
  text-align: center;
  text-decoration: none;
  background: #eb5e40;
  color: #fff;
  font-weight: 700;
  font-size: 16px;
  line-height: 1.5;
  letter-spacing: 0.02em;
  padding: 14px 22px;
  border-radius: 999px;
}

.inv_coupon_cta a:hover {
  transform: translateY(-1px);
  box-shadow: 0 10px 24px rgba(235, 94, 64, 0.35);
}

.inv_coupon_h3 {
  font-family: inherit;
  font-size: 20px;
  margin-bottom: 16px;
  color: #a25924;
}

.inv_coupon_benefits {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

.inv_coupon_benefit_card {
  background: #fff;
  border: 1px solid #f0d9bf;
  border-radius: 14px;
  padding: 16px;
}

.inv_coupon_benefit_card h4 {
  margin: 0 0 12px;
  font-size: 18px;
  color: #703c1c;
  font-family: inherit;
}

.inv_coupon_benefit_main {
  font-size: 24px !important;
  line-height: 1.4;
  font-weight: 700;
  color: #c95f13;
  margin: 0 0 4px;
}

.inv_coupon_benefit_sub {
  margin: 0;
  font-size: 14px;
  color: #5f4a3b;
}

.inv_coupon_steps {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

.inv_coupon_step {
  background: #fff;
  border: 1px solid #f0d9bf;
  border-radius: 14px;
  padding: 16px;
}

.inv_coupon_step_inner {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 14px;
}

.inv_coupon_step_body {
  flex: 1;
  min-width: 0;
}

.inv_coupon_step_no {
  display: inline-block;
  font-size: 12px;
  font-weight: 700;
  color: #fff;
  background: #df7f2d;
  padding: 3px 10px;
  border-radius: 999px;
  margin-bottom: 10px;
}

.inv_coupon_step_icon {
  flex-shrink: 0;
  width: 70px;
  height: 70px;
  margin: 0;
  align-self: center;
}

.inv_coupon_step h3 {
  font-family: inherit;
  margin: 0 0 10px;
  font-size: 18px;
  line-height: 1.5;
  color: #5b3118;
}

.inv_coupon_step p {
  margin: 0;
  font-size: 14px;
}

.inv_coupon_friends {
  display: flex;
  gap: 10px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
  padding: 2px 2px 6px;
}

.inv_coupon_friends::-webkit-scrollbar {
  height: 6px;
}

.inv_coupon_friends::-webkit-scrollbar-thumb {
  background: #e2c4a8;
  border-radius: 999px;
}

.inv_coupon_friend_item {
  flex: 0 0 88%;
  scroll-snap-align: start;
  background: linear-gradient(180deg, #fff 0%, #fff7ef 100%);
  border: 1px solid #f1d8c0;
  border-radius: 14px;
  box-shadow: 0 6px 14px rgba(137, 88, 56, 0.08);
  padding: 14px 14px 12px;
  position: relative;
}

.inv_coupon_friend_item p {
  margin: 0;
}

.inv_coupon_friend_item p:first-child {
  display: inline-block;
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 8px;
  padding: 3px 9px;
  background: #fff1e6;
  border-radius: 999px;
  color: #9b4e1e;
}

.inv_coupon_friend_item p:last-child {
  font-size: 14px;
  line-height: 1.7;
}

.inv_coupon_faq details {
  background: #fff;
  border: 1px solid #f0d9bf;
  border-radius: 12px;
  margin-bottom: 10px;
  overflow: hidden;
}

.inv_coupon_faq summary {
  list-style: none;
  cursor: pointer;
  padding: 14px 42px 14px 14px;
  position: relative;
  font-weight: 700;
  font-size: 15px;
  line-height: 1.55;
}

.inv_coupon_faq summary::-webkit-details-marker {
  display: none;
}

.inv_coupon_faq summary::after {
  content: "+";
  position: absolute;
  right: 14px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 22px;
  line-height: 1;
  color: #bd6a2d;
}

.inv_coupon_faq details[open] summary::after {
  content: "-";
}

.inv_coupon_faq_answer {
  padding: 0 14px 14px;
  font-size: 14px;
}

.inv_coupon_faq_answer p {
  margin: 0;
}

.inv_coupon_faq_answer a {
  color: #b45d1f;
  text-decoration: underline;
  word-break: break-all;
}

.inv_coupon_notes {
  margin-top: 18px;
  background: #fff;
  border: 1px solid #f0d9bf;
  border-radius: 12px;
  padding: 14px 14px 10px;
}

.inv_coupon_notes h3 {
  font-family: inherit;
  font-size: 17px;
  margin: 0 0 10px;
  color: #703c1c;
}

.inv_coupon_notes ul {
  margin: 0;
  padding-left: 1.2em;
}

.inv_coupon_notes li {
  margin-bottom: 5px;
  font-size: 13px;
}

@media (max-width: 767px) {
  .inv_coupon_fv {
    padding-top: 60px;
  }

  .inv_coupon_fv img {
    border-radius: 0;
  }
}

/* 極めて狭いスマホ幅 */
@media (max-width: 359px) {
  .inv_coupon_container {
    padding-left: 12px;
    padding-right: 12px;
    padding-bottom: 48px;
  }

  .inv_coupon_section {
    margin-top: 32px;
  }

  .inv_coupon_section_title {
    font-size: 21px;
    margin-bottom: 14px;
  }

  .inv_coupon_lead p {
    font-size: 14px;
  }

  .inv_coupon_cta {
    margin: 16px 0 20px;
  }

  .inv_coupon_cta a {
    font-size: 15px;
    padding: 12px 18px;
  }

  .inv_coupon_h3 {
    font-size: 18px;
    margin-bottom: 14px;
  }

  .inv_coupon_benefit_main {
    font-size: 22px !important;
  }

  .inv_coupon_step {
    padding: 14px;
  }

  .inv_coupon_step_inner {
    gap: 10px;
  }

  .inv_coupon_step_icon {
    width: 48px;
    height: 48px;
  }

  .inv_coupon_step h3 {
    font-size: 16px;
  }

  .inv_coupon_step p {
    font-size: 13px;
  }

  .inv_coupon_friend_item {
    flex: 0 0 92%;
  }

  .inv_coupon_faq summary {
    font-size: 14px;
    padding-right: 38px;
  }
}