/*===== ご利用方法（baitai.php トーン踏襲・共通ヘッダー配下） ======*/

#about-howto {
  --howto-purple: #7c3aed;
  --howto-purple-dark: #4f46e5;
  --howto-blue: #257cdb;
  --howto-blue-light: #06b6d4;
  --howto-bg-blue: #f5f8fa;
  --howto-bg-purple: #edf1ff;
  --howto-gray: #393d43;
  --howto-muted: #6b7280;
  --howto-gradient: linear-gradient(90deg, var(--howto-purple-dark) 0%, var(--howto-purple) 35%, var(--howto-blue-light) 100%);
  --howto-gradient-deep: linear-gradient(30deg, #83caff 0%, #626cee 50%, #4d44da 100%);

  color: var(--howto-gray);
  font-family: "Zen Kaku Gothic New", "Hiragino Sans", "Hiragino Kaku Gothic ProN", Meiryo, sans-serif;
  font-size: 1rem;
  line-height: 1.7;
  /* 横幅・余白は共通の main-col-rail / main-padder に従う */
  /* ユーザーナビ展開時はコンテンツ幅で折り返すためコンテナ化 */
  width: 100%;
  min-width: 0;
  max-width: 100%;
  container-type: inline-size;
  container-name: about-howto;
}

#about-howto a {
  text-decoration: none;
  transition: all 0.3s;
  cursor: pointer;
}

#about-howto a.text_link {
  color: #2888b9;
  text-decoration: underline;
  font-weight: bold;
}

#about-howto a:hover {
  opacity: 0.75;
}

#about-howto section {
  width: 100%;
  position: relative;
  /* sticky 目次の下に見出しが隠れないよう余白 */
  scroll-margin-top: 5.5rem;
  border-radius: 16px;
}

@media (min-width: 640px) {
  #about-howto section {
    scroll-margin-top: 6.5rem;
  }
}

#about-howto section + section {
  margin-top: 1rem;
}

#about-howto .sec_inner {
  width: 100%;
  max-width: none;
  margin: 0;
  padding: 40px 20px 44px;
  min-width: 0;
  box-sizing: border-box;
}

@media (min-width: 640px) {
  #about-howto .sec_inner {
    padding: 48px 28px 52px;
  }
}

#about-howto .sec_ttl {
  text-align: center;
}

#about-howto .sec_ttl h2 {
  font-family: "Zen Maru Gothic", "Zen Kaku Gothic New", sans-serif;
  font-size: clamp(1.5rem, 2.4vw, 1.9rem);
  font-weight: 700;
  line-height: 1.45;
  letter-spacing: 0.02em;
}

#about-howto .sec_ttl .sec_caption {
  margin-top: 12px;
  font-size: 0.95rem;
  letter-spacing: 0.18em;
  color: #c4c9d2;
}

#about-howto .sec_ttl::after {
  content: "";
  display: block;
  width: 100px;
  height: 8px;
  margin: 16px auto 0;
  border-radius: 999px;
  background: var(--gradient-grad-blue);
}

#about-howto .sec_lead {
  margin: 22px 0 0;
  max-width: none;
  width: 100%;
  text-align: center;
  font-size: 1rem;
  line-height: 1.9;
  font-weight: 500;
}

#about-howto .sec_cnt {
  width: 100%;
  margin: 42px auto 0;
}

#about-howto .text_gradation {
  background: var(--howto-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

#about-howto span.marker_cyan {
  background: linear-gradient(transparent 50%, #8eeeff 70%);
}

#about-howto .btn_area {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 14px;
}

/* カード／セクション最下部ボタン */
#about-howto .step_list .btn_area > .btn-sm,
#about-howto .point_grid .btn_area > .btn-sm,
#about-howto .split_cards .btn_area > .btn-sm,
#about-howto .misc_card__action > .btn-sm {
  font-weight: 700;
  padding-inline: 1.15rem;
}

#about-howto .step_list .btn_area > .btn-md,
#about-howto .point_grid .btn_area > .btn-md,
#about-howto .split_cards .btn_area > .btn-md,
#about-howto .misc_card__action > .btn-md {
  font-weight: 700;
  padding-inline: 1.5rem;
}

#about-howto .btn_area--after-points > .btn-lg {
  font-weight: 700;
  padding-inline: 2rem;
}

/* ===== Hero ===== */
#about-howto .howto-hero {
  overflow: hidden;
  background-color: #f7f8fa;
  background-image: url("/images/about/top_bg.jpg");
  background-repeat: no-repeat;
  background-position: center top;
  background-size: cover;
}

#about-howto .howto-hero .sec_inner {
  padding-top: 36px;
  padding-bottom: 36px;
}

#about-howto .howto-hero__title {
  display: flex;
  align-items: center;
  margin: 0 0 24px;
  font-family: "Zen Maru Gothic", "Zen Kaku Gothic New", sans-serif;
  font-size: clamp(1.9rem, 4vw, 2.8rem);
  font-weight: 900;
  line-height: 1.35;
  letter-spacing: 0.02em;
  text-align: left;
}

#about-howto .howto-hero__title > i {
  flex-shrink: 0;
  margin-right: 0.35em;
  font-size: 0.88em;
  line-height: 1;
  position: relative;
  top: 0.08em;
  background-image: var(--gradient-grad-blue);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

#about-howto .howto-hero__title-text span {
  font-size: 1.15em;
}

#about-howto .howto-hero__body {
  display: grid;
  gap: 24px;
  align-items: center;
  min-width: 0;
  width: 100%;
}

@container about-howto (min-width: 900px) {
  #about-howto .howto-hero__body {
    grid-template-columns: minmax(0, 1.35fr) auto minmax(220px, 0.75fr);
    gap: 28px 32px;
  }
}

#about-howto .howto-hero__copy {
  font-family: "Zen Maru Gothic", "Zen Kaku Gothic New", sans-serif;
  position: relative;
  z-index: 1;
}

#about-howto .howto-hero__lead {
  margin-top: 0;
  font-size: clamp(0.98rem, 1.5vw, 1.12rem);
  font-weight: 500;
  line-height: 1.85;
  max-width: 36em;
}

#about-howto .howto-hero__lead-more {
  display: inline-block;
  margin-top: 0.7em;
}

#about-howto .howto-hero__no1 {
  font-weight: 700;
  text-decoration: underline;
  text-underline-offset: 0.18em;
  text-decoration-color: var(--color-grad-blue-2, #3b82f6);
  background-image: var(--gradient-grad-blue);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

#about-howto .howto-hero__no1:hover {
  opacity: 0.85;
}

#about-howto .howto-hero__no1-mark {
  margin-left: 0.05em;
  font-size: 0.5em;
  font-weight: 500;
  line-height: 1;
  color: #9ca3af;
  vertical-align: super;
}

#about-howto .howto-hero__archives {
  margin-top: 22px;
  width: 100%;
}

#about-howto .howto-hero__archives-imgs {
  display: flex;
  flex-wrap: nowrap;
  justify-content: center;
  align-items: center;
  gap: 16px;
  width: 100%;
  margin-bottom: 8px;
}

#about-howto .howto-hero__archives-imgs img {
  display: block;
  flex: 0 1 34%;
  width: 34%;
  max-width: 160px;
  height: auto;
}

#about-howto .howto-hero__archives-annotation {
  margin: 0;
  font-size: 0.7rem;
  line-height: 1.5;
  color: var(--howto-muted);
  text-align: center;
}

#about-howto .howto-hero__visual {
  display: flex;
  align-items: center;
  justify-content: center;
}

#about-howto .howto-hero__visual img {
  display: block;
  width: min(100%, 180px);
  max-width: 100%;
  height: auto;
}

@container about-howto (min-width: 900px) {
  #about-howto .howto-hero__visual img {
    width: 200px;
  }
}

#about-howto .howto-hero__panel {
  position: relative;
  z-index: 1;
  border-radius: 24px;
  background: transparent;
  box-shadow: 0 12px 32px rgba(79, 70, 229, 0.14);
  padding: 0;
  border: 1px solid rgba(229, 231, 235, 0.55);
  overflow: hidden;
  font-family: "Zen Maru Gothic", "Zen Kaku Gothic New", sans-serif;
}

#about-howto .howto-hero__panel h2 {
  font-family: inherit;
  font-size: 1.05rem;
  font-weight: 700;
  margin: 0;
  padding: 12px 16px;
  border-radius: 0;
  text-align: center;
  color: #fff;
  background: var(--gradient-grad-blue);
}

#about-howto .howto-hero__panel h2 span {
  color: inherit;
  background: none;
  -webkit-background-clip: border-box;
  background-clip: border-box;
  -webkit-text-fill-color: currentColor;
}

#about-howto .howto-brace--l {
  margin-right: 0.4em;
}

#about-howto .howto-brace--r {
  margin-left: 0.4em;
}

#about-howto .howto-hero__panel ol {
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 16px 20px 22px;
  list-style: none;
  background: transparent;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

#about-howto .howto-hero__panel li {
  display: block;
}

#about-howto .howto-hero__panel .title {
  display: flex;
  align-items: baseline;
  gap: 0.45rem;
  font-weight: 700;
  font-size: 0.95rem;
  line-height: 1.4;
}

#about-howto .howto-hero__panel .num {
  flex-shrink: 0;
  display: inline-block;
  color: transparent;
  font-family: inherit;
  font-weight: 800;
  font-size: 1.15em;
  line-height: 1;
  background: var(--howto-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  opacity: 1;
}

#about-howto .howto-hero__panel .desc {
  margin-top: 4px;
  padding-left: 0;
  font-size: 0.82rem;
  color: var(--howto-muted);
  line-height: 1.6;
}

/* ===== TOC ===== */
#about-howto .howto-toc-sentinel {
  height: 1px;
  margin: 0;
  pointer-events: none;
  visibility: hidden;
}

#about-howto .howto-toc {
  margin-top: 1.5rem;
  margin-bottom: 0.25rem;
  width: 100%;
  min-width: 0;
  max-width: 100%;
  background: transparent;
  border: 0;
  box-shadow: none;
  border-radius: 0;
  font-family: "Zen Maru Gothic", "Zen Kaku Gothic New", sans-serif;
}

@media (min-width: 640px) {
  #about-howto .howto-toc {
    position: sticky;
    top: 0;
    z-index: 30;
    margin-top: 2rem;
    margin-bottom: 0.5rem;
  }

  #about-howto .howto-toc.is-stuck {
    background: rgba(255, 255, 255, 0.28);
    -webkit-backdrop-filter: blur(10px);
    backdrop-filter: blur(10px);
  }
}

#about-howto .howto-toc .sec_inner {
  padding: 8px 0 12px;
  width: 100%;
  min-width: 0;
  max-width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
}

@media (min-width: 640px) {
  #about-howto .howto-toc .sec_inner {
    padding: 10px 0 14px;
  }
}

/* 横幅全域を均等割（ラベル間の余白が均等になるよう space-between） */
#about-howto .howto-toc__list {
  display: flex;
  flex-wrap: nowrap;
  align-items: center;
  justify-content: flex-start;
  gap: 1.75rem;
  width: max-content;
  min-width: 100%;
  box-sizing: border-box;
  margin: 0;
  padding: 0 0 2px;
  list-style: none;
}

#about-howto .howto-toc__list > li {
  flex: 0 0 auto;
  display: flex;
  justify-content: center;
}

#about-howto .howto-toc__link {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.55em;
  white-space: nowrap;
  padding: 4px 2px 10px;
  border: 0;
  border-radius: 0;
  background: transparent;
  color: #111827;
  font-size: 1.22rem;
  font-weight: 700;
  font-family: "Zen Maru Gothic", "Zen Kaku Gothic New", sans-serif;
  line-height: 1.3;
  box-shadow: none;
  cursor: pointer;
  opacity: 1;
  transition:
    opacity 0.25s ease,
    color 0.25s ease,
    transform 0.25s ease;
}

#about-howto .howto-toc__link > i {
  font-size: 0.85em;
  line-height: 1;
  background-image: var(--gradient-grad-blue);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
  transition: transform 0.28s ease;
}

#about-howto .howto-toc__link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  border-radius: 999px;
  background-image: var(--gradient-grad-blue);
  transform: scaleX(0);
  transform-origin: center;
  transition: transform 0.28s ease;
}

/* リンク個別ホバー時は文字を grad-blue + 下線・アイコンアニメ */
#about-howto .howto-toc__link:hover > i,
#about-howto .howto-toc__link:hover .howto-toc__label {
  background-image: var(--gradient-grad-blue);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

#about-howto .howto-toc__link:hover {
  transform: translateY(-1px);
}

#about-howto .howto-toc__link:hover > i {
  transform: translateY(2px);
}

#about-howto .howto-toc__link:hover::after,
#about-howto .howto-toc__link.is-active::after {
  transform: scaleX(1);
}

/* sticky 時: ナビ領域どこでも hover で全リンク opacity 1 */
#about-howto .howto-toc.is-stuck .howto-toc__link {
  opacity: 0.5;
}

#about-howto .howto-toc.is-stuck:hover .howto-toc__link,
#about-howto .howto-toc.is-stuck .howto-toc__link.is-active {
  opacity: 1;
}

#about-howto .howto-toc.is-stuck .howto-toc__link.is-active > i,
#about-howto .howto-toc.is-stuck .howto-toc__link.is-active .howto-toc__label {
  background-image: var(--gradient-grad-blue);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

/* 十分な幅では均等配置 */
@container about-howto (min-width: 980px) {
  #about-howto .howto-toc__list {
    justify-content: space-between;
    gap: 0;
    width: 100%;
    min-width: 0;
    padding-bottom: 0;
  }
}

/* ===== Feature list（できること） ===== */
#about-howto .feature_list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
  width: 100%;
}

#about-howto .feature_list li {
  display: grid;
  grid-template-columns: minmax(0, 24rem) minmax(0, 1fr);
  gap: 10px 24px;
  align-items: center;
  width: 100%;
  margin: 0;
  padding: 12px 16px;
  border: 0;
  border-radius: 14px;
  background: #f3f4f6;
  box-shadow: none;
  text-align: left;
  min-width: 0;
  box-sizing: border-box;
}

#about-howto .feature_list h3 {
  display: inline-flex;
  align-items: center;
  flex-wrap: nowrap;
  gap: 0.5rem;
  margin: 0;
  font-family: "Zen Maru Gothic", sans-serif;
  font-size: 1.05rem;
  font-weight: 700;
  line-height: 1.45;
  text-align: left;
  color: #333;
}

#about-howto .feature_list h3 > span {
  white-space: nowrap;
}

#about-howto .feature_list h3 > i {
  flex-shrink: 0;
  font-size: 1.05em;
  background: var(--gradient-grad-blue);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

#about-howto .feature_list__link {
  display: inline-flex;
  align-items: center;
  flex-wrap: nowrap;
  gap: 0.35rem;
  min-width: 0;
  color: inherit;
  text-decoration: none;
}

#about-howto .feature_list__link span {
  white-space: nowrap;
  transition: background-image 0.2s ease, color 0.2s ease;
}

#about-howto .feature_list__ext {
  flex-shrink: 0;
  font-size: 0.85em;
  background: none;
  -webkit-text-fill-color: currentColor;
  color: var(--howto-muted);
  transition: color 0.2s ease;
}

#about-howto .feature_list__link:hover span,
#about-howto .feature_list__link:focus-visible span {
  background-image: var(--gradient-grad-blue);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

#about-howto .feature_list__link:hover .feature_list__ext,
#about-howto .feature_list__link:focus-visible .feature_list__ext {
  color: var(--color-grad-blue-2, #3b82f6);
}

#about-howto .feature_list__link:focus-visible {
  outline: 2px solid #2888b9;
  outline-offset: 2px;
  border-radius: 4px;
}

#about-howto .howto-term {
  display: inline;
  white-space: nowrap;
}

#about-howto .howto-ext-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin: 0 0.05em 0 0.2em;
  padding: 0;
  border: 0;
  background: none;
  color: var(--howto-muted);
  vertical-align: middle;
  text-decoration: none;
  cursor: pointer;
  transition: color 0.2s ease, opacity 0.2s ease;
}

#about-howto .howto-ext-link i {
  font-size: 0.78em;
}

#about-howto .howto-ext-link:hover {
  color: var(--color-grad-blue-2, #3b82f6);
  opacity: 1;
}

#about-howto .feature_list p {
  margin: 0;
  padding: 10px 14px;
  border-radius: 10px;
  background: #fff;
  font-size: 0.875rem;
  line-height: 1.7;
  color: #4b5563;
  text-align: left;
  box-shadow: 0 1px 2px rgba(15, 23, 42, 0.04);
}

@container about-howto (max-width: 719px) {
  #about-howto .feature_list li {
    grid-template-columns: 1fr;
    gap: 6px;
    padding: 12px 14px;
  }
}

#about-howto .about-start {
  margin-top: 48px;
}

#about-howto .about-start__ttl {
  margin: 0;
  text-align: center;
  font-family: "Zen Maru Gothic", sans-serif;
  font-size: clamp(1.2rem, 2vw, 1.45rem);
  font-weight: 700;
  color: #333;
}

#about-howto .about-start__lead {
  margin: 12px 0 0;
  text-align: center;
  font-size: 0.98rem;
  line-height: 1.75;
  color: var(--howto-muted);
}

#about-howto .about-start .step_list {
  margin-top: 28px;
}

/* ===== 3ステップ ===== */
#about-howto .step_list {
  display: grid;
  gap: 18px;
  margin: 0;
  padding: 0;
  list-style: none;
}

@container about-howto (min-width: 860px) {
  #about-howto .step_list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 22px;
  }
}

#about-howto .step_list li {
  display: flex;
  flex-direction: column;
  height: 100%;
  background: #fff;
  border-radius: 20px;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.12);
  padding: 20px 22px 28px;
  text-align: center;
  overflow: hidden;
}

#about-howto .step_list li:has(.btn_area) {
  padding-bottom: 0;
}

#about-howto .step_list .item_ttl {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.65rem;
  margin-bottom: 12px;
  min-height: 0;
}

#about-howto .step_list .item_ttl .item_num {
  flex-shrink: 0;
  font-family: "Zen Maru Gothic", sans-serif;
  font-weight: 800;
  font-size: 2.4rem;
  line-height: 1;
  background: var(--howto-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
  opacity: 0.35;
}

#about-howto .step_list .item_ttl h3 {
  position: static;
  transform: none;
  margin: 0;
  width: auto;
  max-width: none;
  font-size: clamp(1.05rem, 1.6vw, 1.2rem);
  font-weight: 700;
  font-family: "Zen Maru Gothic", sans-serif;
  line-height: 1.4;
  color: #333;
  text-align: left;
}

#about-howto .step_list p {
  margin-top: 10px;
  font-size: 0.92rem;
  line-height: 1.75;
  color: #4b5563;
  text-align: left;
}

#about-howto .step_list .btn_area {
  margin-top: auto;
  margin-left: -22px;
  margin-right: -22px;
  align-self: stretch;
  padding: 16px 22px;
  border-top: 18px solid transparent;
  background: #f3f4f6;
  background-clip: padding-box;
  border-radius: 0 0 20px 20px;
  justify-content: center;
}

/* ===== Detail sections ===== */
#about-howto .howto-section--alt {
  background: var(--howto-bg-purple);
}

#about-howto .howto-section--soft {
  background: var(--howto-bg-blue);
}

#about-howto .point_grid {
  display: grid;
  gap: 18px;
  margin: 0;
  padding: 0;
  list-style: none;
}

@container about-howto (min-width: 800px) {
  #about-howto .point_grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    align-items: stretch;
  }

  #about-howto .point_grid.point_grid--2 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

#about-howto .point_grid li {
  display: flex;
  flex-direction: column;
  background: #fff;
  border-radius: 18px;
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.1);
  padding: 24px 20px;
  overflow: hidden;
}

#about-howto .point_grid li:has(.btn_area) {
  padding-bottom: 0;
}

/* リード文の行数が違ってもカード間で箇条書き・ボタンの開始位置を揃える */
@container about-howto (min-width: 800px) {
  @supports (grid-template-rows: subgrid) {
    #about-howto .point_grid > li {
      display: grid;
      grid-template-rows: subgrid;
      grid-row: span 4;
      row-gap: 0;
    }

    #about-howto .point_grid:has(.btn_area) > li {
      grid-row: span 5;
    }
  }
}

#about-howto .point_grid .eyebrow {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  color: var(--howto-purple-dark);
  margin-bottom: 10px;
}

#download .point_grid .eyebrow,
#seminar .point_grid .eyebrow,
#matching .point_grid .eyebrow {
  color: transparent;
  background-image: var(--gradient-grad-blue);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

#about-howto .point_step {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  margin-bottom: 10px;
}

#about-howto .point_step__badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.7rem;
  height: 1.7rem;
  border-radius: 999px;
  background-image: var(--gradient-grad-blue);
  color: #fff;
  font-size: 0.85rem;
  font-weight: 800;
  line-height: 1;
  box-shadow: 0 6px 14px rgba(59, 130, 246, 0.28);
}

#about-howto .point_step__label {
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  color: transparent;
  background-image: var(--gradient-grad-blue);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

#about-howto .point_grid h3 {
  font-family: "Zen Maru Gothic", sans-serif;
  font-size: 1.05rem;
  font-weight: 700;
  line-height: 1.4;
}

#about-howto .point_grid p {
  margin-top: 10px;
  font-size: 0.92rem;
  line-height: 1.75;
  color: #4b5563;
}

#about-howto .point_grid > li > ul {
  position: relative;
  margin-top: 24px;
  padding-left: 1.2em;
  padding-top: 12px;
  font-size: 0.84rem;
  font-weight: 700;
  line-height: 1.7;
  color: #4b5563;
}

#about-howto .point_grid > li > ul > li {
  font-size: inherit;
  font-weight: inherit;
  line-height: inherit;
  color: inherit;
}

#about-howto .point_grid ul::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 32px;
  height: 1.5px;
  border-radius: 999px;
  background-image: var(--gradient-grad-blue);
}

#about-howto .point_grid li li {
  display: list-item;
  flex-direction: unset;
  background: none;
  box-shadow: none;
  border-radius: 0;
  padding: 0;
  margin: 0 0 0.35em;
  list-style: disc;
  overflow: visible;
}

#about-howto .point_grid .btn_area {
  margin-top: auto;
  margin-left: -20px;
  margin-right: -20px;
  align-self: stretch;
  padding: 16px 20px;
  border-top: 18px solid transparent;
  background: #f3f4f6;
  background-clip: padding-box;
  border-radius: 0 0 18px 18px;
  justify-content: center;
}

#about-howto .ai_note {
  margin-top: 18px;
  padding: 16px 18px;
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.7);
  font-size: 0.88rem;
  color: var(--howto-muted);
  line-height: 1.7;
}

#about-howto .split_cards {
  display: grid;
  gap: 18px;
  margin: 0;
  padding: 0;
  list-style: none;
}

@container about-howto (min-width: 760px) {
  #about-howto .split_cards {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

#about-howto .split_cards li {
  display: flex;
  flex-direction: column;
  height: 100%;
  background: #fff;
  border-radius: 18px;
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.1);
  padding: 26px 22px;
  overflow: hidden;
}

#about-howto .split_cards li:has(.btn_area) {
  padding-bottom: 0;
}

#about-howto .split_cards h3 {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: "Zen Maru Gothic", sans-serif;
  font-size: 1.1rem;
  font-weight: 700;
  color: #333;
}

#about-howto .split_cards h3 > i {
  flex-shrink: 0;
  font-size: 1.05em;
  background: var(--gradient-grad-blue);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

#about-howto .split_cards p {
  margin-top: 10px;
  font-size: 0.93rem;
  line-height: 1.75;
  color: #4b5563;
}

#about-howto .split_cards > li > ul {
  margin-top: 10px;
  padding-left: 1.2em;
  font-size: 0.92rem;
  line-height: 1.75;
  color: #4b5563;
  flex: 1;
}

#about-howto .split_cards > li > ul > li {
  display: list-item;
  flex-direction: unset;
  height: auto;
  background: none;
  box-shadow: none;
  border-radius: 0;
  padding: 0;
  margin: 0 0 0.35em;
  list-style: disc;
  overflow: visible;
}

#about-howto .split_cards .btn_area {
  margin-top: auto;
  margin-left: -22px;
  margin-right: -22px;
  align-self: stretch;
  padding: 16px 22px;
  border-top: 18px solid transparent;
  background: #f3f4f6;
  background-clip: padding-box;
  border-radius: 0 0 18px 18px;
  justify-content: center;
}

/* ===== Other features ===== */
#about-howto .misc_grid {
  display: grid;
  gap: 16px;
  margin: 0;
  padding: 0;
  list-style: none;
}

@container about-howto (min-width: 720px) {
  #about-howto .misc_grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

#about-howto .misc_grid li {
  display: flex;
  margin: 0;
  padding: 0;
  min-height: 100%;
}

#about-howto .misc_card {
  display: grid;
  grid-template-columns: 44px 1fr;
  gap: 14px;
  align-content: stretch;
  width: 100%;
  height: 100%;
  box-sizing: border-box;
  margin: 0;
  padding: 20px 18px;
  border: none;
  border-radius: 16px;
  background: #fff;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
  color: inherit;
  font: inherit;
  text-align: left;
}

#about-howto .misc_card__body {
  display: flex;
  flex-direction: column;
  min-width: 0;
  min-height: 100%;
}

#about-howto .misc_grid .icon {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  background: var(--howto-gradient);
  font-size: 1.05rem;
}

#about-howto .misc_grid h3 {
  font-size: 1rem;
  font-weight: 700;
  font-family: "Zen Maru Gothic", sans-serif;
}

#about-howto .misc_grid p {
  margin-top: 6px;
  font-size: 0.88rem;
  line-height: 1.7;
  color: #4b5563;
}

#about-howto .misc_card__hint {
  display: inline-block;
  align-self: flex-start;
  margin: 0;
  padding: 3px 10px;
  border: none;
  border-radius: 999px;
  background: #e5e7eb;
  color: #6b7280;
  font-size: 0.75rem;
  font-weight: 700;
  font-family: inherit;
  line-height: 1.4;
  cursor: pointer;
  transition: background-color 0.2s ease, color 0.2s ease;
}

#about-howto .misc_card__hint:hover {
  background: #d1d5db;
  color: #4b5563;
}

#about-howto .misc_card__action {
  margin-top: auto;
  padding-top: 14px;
}

#about-howto .misc_grid li.is-disabled .misc_card .icon,
#about-howto .misc_grid li.is-disabled .misc_card__body > h3,
#about-howto .misc_grid li.is-disabled .misc_card__body > p {
  opacity: 0.62;
  filter: grayscale(0.2);
}

/* ===== FAQ ===== */
#about-howto .question_list {
  margin: 0;
  padding: 0;
  list-style: none;
}

#about-howto .question_list li {
  border-radius: 20px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.16);
  padding: 26px 28px 22px;
  background: #fff;
}

#about-howto .question_list li:not(:last-child) {
  margin-bottom: 18px;
}

#about-howto .question_list .q_ttl {
  margin: 0 0 12px;
  font-size: 1.05rem;
  font-weight: 700;
  line-height: 1.5;
}

#about-howto .question_list .q_mark,
#about-howto .question_list .a_mark {
  margin-right: 0.4em;
}

#about-howto .question_list p {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.8;
  color: #4b5563;
}

#about-howto .question_list p strong,
#about-howto .question_list .a_mark {
  color: #333;
  font-weight: 700;
}

#about-howto .question_list__ext {
  margin-left: 0.25em;
  font-size: 0.78em;
  vertical-align: middle;
}

/* ===== Closing CTA ===== */
#about-howto .howto-cta {
  position: relative;
  overflow: hidden;
  color: #f3f4f6;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  background-color: #0b0d12;
  background-image:
    radial-gradient(ellipse 90% 70% at 18% 0%, rgba(88, 102, 160, 0.28) 0%, transparent 58%),
    radial-gradient(ellipse 70% 55% at 88% 100%, rgba(59, 130, 246, 0.16) 0%, transparent 55%),
    linear-gradient(155deg, #141821 0%, #0b0d12 48%, #10131a 100%);
}

#about-howto .howto-cta::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0.35;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.025) 1px, transparent 1px);
  background-size: 28px 28px;
  mask-image: radial-gradient(ellipse 80% 75% at 50% 40%, #000 20%, transparent 85%);
}

#about-howto .howto-cta__sparkles {
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  overflow: hidden;
}

#about-howto .howto-cta__sparkles span {
  position: absolute;
  width: 2px;
  height: 2px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.9);
  box-shadow: 0 0 6px rgba(255, 255, 255, 0.55);
  opacity: 0;
  animation: howto-cta-twinkle 1.8s ease-in-out infinite;
}

#about-howto .howto-cta__sparkles span:nth-child(1) { top: 14%; left: 8%; animation-delay: 0.1s; }
#about-howto .howto-cta__sparkles span:nth-child(2) { top: 22%; left: 24%; width: 3px; height: 3px; animation-delay: 0.4s; animation-duration: 1.5s; }
#about-howto .howto-cta__sparkles span:nth-child(3) { top: 18%; left: 61%; animation-delay: 0.9s; animation-duration: 1.7s; }
#about-howto .howto-cta__sparkles span:nth-child(4) { top: 30%; left: 88%; width: 3px; height: 3px; animation-delay: 0.2s; }
#about-howto .howto-cta__sparkles span:nth-child(5) { top: 48%; left: 12%; animation-delay: 1.1s; animation-duration: 1.6s; }
#about-howto .howto-cta__sparkles span:nth-child(6) { top: 56%; left: 42%; width: 3px; height: 3px; animation-delay: 0.6s; }
#about-howto .howto-cta__sparkles span:nth-child(7) { top: 62%; left: 76%; animation-delay: 0.3s; animation-duration: 1.4s; }
#about-howto .howto-cta__sparkles span:nth-child(8) { top: 72%; left: 18%; animation-delay: 1.0s; }
#about-howto .howto-cta__sparkles span:nth-child(9) { top: 78%; left: 55%; width: 3px; height: 3px; animation-delay: 0.5s; animation-duration: 1.9s; }
#about-howto .howto-cta__sparkles span:nth-child(10) { top: 84%; left: 91%; animation-delay: 1.3s; }
#about-howto .howto-cta__sparkles span:nth-child(11) { top: 38%; left: 51%; animation-delay: 0.7s; animation-duration: 1.55s; }
#about-howto .howto-cta__sparkles span:nth-child(12) { top: 10%; left: 78%; animation-delay: 1.2s; animation-duration: 1.65s; }

@keyframes howto-cta-twinkle {
  0%,
  100% {
    opacity: 0;
    transform: scale(0.6);
  }
  35%,
  55% {
    opacity: 0.9;
    transform: scale(1);
  }
}

@media (prefers-reduced-motion: reduce) {
  #about-howto .howto-cta__sparkles span {
    animation: none;
    opacity: 0.25;
  }
}

#about-howto .howto-cta .sec_inner {
  position: relative;
  z-index: 1;
}

#about-howto .howto-cta .sec_ttl h2 {
  font-size: clamp(1.4rem, 2.2vw, 1.8rem);
  color: #fff;
}

#about-howto .howto-cta .sec_ttl .sec_caption {
  color: rgba(226, 232, 240, 0.55);
}

#about-howto .howto-cta .sec_ttl::after {
  background: var(--gradient-grad-blue);
  box-shadow: 0 0 18px rgba(59, 130, 246, 0.35);
}

#about-howto .howto-cta .sec_lead {
  margin-bottom: 8px;
  color: rgba(243, 244, 246, 0.86);
}

#about-howto .howto-cta .text_gradation {
  background: var(--gradient-grad-blue);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

#about-howto .howto-cta__note {
  margin-top: 18px;
  text-align: center;
  font-size: 0.88rem;
  color: rgba(209, 213, 219, 0.78);
}

#about-howto .howto-cta__note .text_link {
  color: #fff;
  text-decoration: underline;
  text-underline-offset: 0.18em;
}

#about-howto .btn_area--after-points {
  margin-top: 34px;
}

#about-howto .btn_area--cta {
  margin-top: 28px;
  flex-direction: column;
  gap: 16px;
}

#about-howto .btn_area--cta-auth,
#about-howto .btn_area--cta-nav {
  width: 100%;
  margin-top: 0;
}

#about-howto .btn_area--cta-auth {
  gap: 16px;
  max-width: 40rem;
  margin-inline: auto;
}

#about-howto .btn_area--cta-auth .howto-cta__auth-btn {
  flex: 1 1 0;
  min-width: 0;
  width: 100%;
  min-height: 3.85rem;
  padding-inline: 1.75rem;
  font-size: 1.08rem;
}

#about-howto .btn_area--cta-nav {
  gap: 12px;
}

#about-howto .btn_area--cta .btn-lg {
  min-height: 3.25rem;
}

#about-howto .howto-cta__nav-btn {
  background: #fff;
  color: transparent;
  border: 1px solid rgba(255, 255, 255, 0.12);
  box-shadow: 0 10px 28px rgba(0, 0, 0, 0.28);
}

#about-howto .howto-cta__nav-btn > i,
#about-howto .howto-cta__nav-btn > span {
  background-image: var(--gradient-grad-blue);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

#about-howto .howto-cta__nav-btn.btn-ripple::after {
  border-color: var(--color-grad-blue-2);
}

@media (max-width: 639px) {
  #about-howto .sec_inner {
    padding: 32px 16px 36px;
  }

  #about-howto .howto-toc .sec_inner {
    padding: 8px 0 12px;
  }

  #about-howto .question_list li {
    padding: 20px 18px 18px;
  }

  #about-howto .question_list .q_ttl {
    font-size: 0.98rem;
  }

  #about-howto .btn_area--cta-auth,
  #about-howto .btn_area--cta-nav {
    flex-direction: column;
  }

  #about-howto .btn_area--cta .btn-lg {
    width: 100%;
  }
}