/* ============================================================
   センタライズ LP — 元ペライチデザイン再現
   帯見出し: #3eb2b0 / CTA: #f47e00 / 本文: #212423
   ============================================================ */
* { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --teal: #3eb2b0;
  --orange: #f47e00;
  --ink: #212423;
}

html { scroll-behavior: smooth; }

body {
  font-family: "Hiragino Kaku Gothic Pro", "ヒラギノ角ゴ Pro W3", Meiryo, メイリオ, Osaka, "MS PGothic", arial, helvetica, sans-serif;
  color: var(--ink);
  background: #fff;
  line-height: 1.9;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; height: auto; display: block; }

.container { max-width: 950px; margin: 0 auto; padding: 0 20px; }

/* ---------- 固定ヘッダー ---------- */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  background: #fff;
  z-index: 1000;
  box-shadow: 0 1px 6px rgba(0,0,0,.12);
}
.site-header .inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 8px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}
.site-header .logo img { height: 44px; width: auto; }
.header-cta {
  display: inline-block;
  background: var(--orange);
  color: #fff;
  text-decoration: none;
  font-size: 18px;
  font-weight: bold;
  padding: 10px 26px;
  white-space: nowrap;
  transition: opacity .2s;
}
.header-cta:hover { opacity: .85; }

.header-spacer { height: 62px; }

/* ---------- ヒーロー ---------- */
.hero img { width: 100%; }
.hero .sp { display: none; }

/* ---------- ティール矢印帯見出し ---------- */
.band {
  background: var(--teal);
  color: #fff;
  text-align: center;
  padding: 22px 16px;
  position: relative;
  margin-bottom: 46px;
}
.band h2 {
  font-size: 28px;
  font-weight: 400;
  line-height: 1.6;
}
.band::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: -18px;
  transform: translateX(-50%);
  border: 18px solid transparent;
  border-top-color: var(--teal);
  border-bottom: 0;
}

/* ---------- 汎用 ---------- */
.section { padding: 40px 0; }
.section--tight { padding: 20px 0; }
.center { text-align: center; }
h2.plain {
  font-size: 28px;
  font-weight: 400;
  text-align: center;
  line-height: 1.7;
  margin-bottom: 24px;
}
.lead { text-align: center; font-size: 16px; }
.lead .big { font-size: 22px; font-weight: bold; }
.lead .accent { color: var(--orange); font-weight: bold; }
.mt-20 { margin-top: 20px; }
.mt-40 { margin-top: 40px; }

/* ---------- 画像行 ---------- */
.img-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  align-items: center;
}
.img-row--6 { grid-template-columns: repeat(3, 1fr); }
.arrow-band img { width: 100%; }

/* ---------- 購入セクション ---------- */
.purchase { padding: 46px 0; }
.product-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 30px;
  margin-top: 10px;
}
.product-card {
  border: 1px solid #e5e5e5;
  background: #fff;
  box-shadow: 0 2px 10px rgba(0,0,0,.07);
  padding: 22px 22px 26px;
  text-align: center;
  display: flex;
  flex-direction: column;
}
.product-card h3 {
  font-size: 26px;
  font-weight: 400;
  line-height: 1.5;
  margin: 16px 0 4px;
}
.product-card .meta { font-size: 15px; color: #444; }
.product-card .price {
  font-size: 28px;
  font-weight: 700;
  margin: 10px 0 4px;
}
.product-card .price small { font-size: 15px; font-weight: 400; }

.size-label { font-size: 14px; color: #666; margin-top: 10px; }
.size-picker {
  display: flex;
  justify-content: center;
  gap: 10px;
  margin: 8px 0 18px;
}
.size-btn {
  width: 56px;
  height: 44px;
  border: 2px solid #ccc;
  background: #fff;
  color: var(--ink);
  font-size: 17px;
  font-weight: bold;
  font-family: inherit;
  cursor: pointer;
  transition: all .15s;
}
.size-btn:hover { border-color: var(--orange); }
.size-btn.selected {
  background: var(--orange);
  border-color: var(--orange);
  color: #fff;
}
.buy-btn {
  display: block;
  width: 100%;
  margin-top: auto;
  background: var(--orange);
  color: #fff;
  border: 0;
  font-family: inherit;
  font-size: 20px;
  font-weight: bold;
  padding: 16px 8px;
  cursor: pointer;
  transition: opacity .2s;
}
.buy-btn:hover { opacity: .85; }
.buy-btn[disabled] { opacity: .55; cursor: default; }
.buy-note { font-size: 12px; color: #888; margin-top: 10px; }
.stripe-badge { font-size: 12.5px; color: #666; margin-top: 8px; }

/* ---------- 体験者の声 ---------- */
.voice-list { display: grid; gap: 34px; }
.voice-card {
  border: 1px solid #e8e8e8;
  box-shadow: 0 2px 10px rgba(0,0,0,.06);
  background: #fff;
  overflow: hidden;
  display: grid;
  grid-template-columns: 340px 1fr;
  align-items: start;
}
.voice-card .photo { padding: 20px 0 20px 20px; }
.voice-card .photo img { width: 100%; height: auto; }
.voice-card .body { padding: 24px 26px 28px; }
.voice-card h3 { font-size: 18px; font-weight: bold; line-height: 1.6; }
.voice-card .who { font-size: 14.5px; color: #555; margin: 6px 0 12px; }
.voice-card p { font-size: 15.5px; }
.voice-tag {
  display: inline-block;
  color: var(--teal);
  font-weight: bold;
  font-size: 13px;
  letter-spacing: .18em;
  margin-top: 14px;
}

/* ---------- 3つの仕掛け ---------- */
.shikake { margin-bottom: 60px; }
.shikake-head { text-align: center; margin-bottom: 26px; }
.shikake-head .no {
  display: inline-block;
  background: var(--ink);
  color: #fff;
  font-size: 14px;
  letter-spacing: .2em;
  padding: 4px 18px;
  margin-bottom: 10px;
}
.shikake-head h3 { font-size: 26px; font-weight: 400; line-height: 1.6; }
.shikake-grid {
  display: grid;
  grid-template-columns: 1fr 1.15fr;
  gap: 30px;
  align-items: start;
}
.shikake-grid p { font-size: 15.5px; }
.sub-head {
  font-size: 24px;
  font-weight: 400;
  text-align: center;
  margin: 40px 0 16px;
}
.tree-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-top: 26px;
}
.note { font-size: 13px; color: #777; }

/* ---------- 活用事例 ---------- */
.usecase-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 30px;
  align-items: center;
}
.usecase-list { list-style: none; }
.usecase-list li {
  padding: 10px 0;
  font-size: 15.5px;
  border-bottom: 1px dashed #ddd;
}

/* ---------- 仕様 ---------- */
.spec-box {
  border: 2px solid var(--ink);
  max-width: 640px;
  margin: 0 auto;
  padding: 26px 30px;
  text-align: center;
  font-size: 16px;
}
.spec-box .ttl { font-size: 20px; font-weight: bold; margin-bottom: 10px; }

/* ---------- シリーズ ---------- */
.series-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
  margin-bottom: 30px;
}
.series-item { text-align: center; font-size: 15px; line-height: 1.6; }
.series-item img { border: 1px solid #eee; margin-bottom: 8px; }
.series-cta {
  display: block;
  max-width: 560px;
  margin: 0 auto;
  background: #e58100;
  color: #fff;
  text-decoration: none;
  text-align: center;
  font-size: 22px;
  font-weight: bold;
  padding: 17px 8px;
  transition: opacity .2s;
}
.series-cta:hover { opacity: .85; }

/* ---------- FAQ ---------- */
.faq-list { max-width: 860px; margin: 0 auto; }
.faq-item {
  border: 1px solid #ddd;
  margin-bottom: 12px;
  background: #fff;
}
.faq-item summary {
  cursor: pointer;
  list-style: none;
  padding: 16px 48px 16px 18px;
  font-size: 17px;
  font-weight: bold;
  position: relative;
  line-height: 1.6;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
  content: "＋";
  position: absolute;
  right: 16px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--teal);
  font-size: 20px;
}
.faq-item[open] summary::after { content: "－"; }
.faq-item .a {
  padding: 0 18px 18px;
  font-size: 15px;
  color: #333;
  border-top: 1px dashed #e5e5e5;
  padding-top: 14px;
  margin: 0 18px 18px;
  padding-left: 0;
  padding-right: 0;
}

/* ---------- フッター ---------- */
.site-footer {
  background: #f5f5f5;
  text-align: center;
  padding: 26px 16px;
  font-size: 13px;
  color: #666;
  margin-top: 60px;
}

/* ---------- YouTube ---------- */
.video-wrap {
  position: relative;
  max-width: 760px;
  margin: 0 auto;
  aspect-ratio: 16 / 9;
}
.video-wrap iframe {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: 0;
}

/* ---------- モーダル（リンク未設定時） ---------- */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.5);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 2000;
  padding: 20px;
}
.modal-backdrop.show { display: flex; }
.modal {
  background: #fff;
  max-width: 420px;
  width: 100%;
  padding: 30px 26px;
  text-align: center;
}
.modal h3 { font-size: 18px; margin-bottom: 12px; }
.modal p { font-size: 14.5px; color: #444; }
.modal button {
  margin-top: 18px;
  background: var(--ink);
  color: #fff;
  border: 0;
  font-family: inherit;
  font-size: 15px;
  padding: 10px 34px;
  cursor: pointer;
}

/* ---------- レスポンシブ ---------- */
@media (max-width: 760px) {
  body { font-size: 15px; }
  .hero .pc { display: none; }
  .hero .sp { display: block; }
  .band h2, h2.plain { font-size: 22px; }
  .header-cta { font-size: 15px; padding: 8px 16px; }
  .site-header .logo img { height: 36px; }
  .header-spacer { height: 54px; }
  .img-row, .img-row--6 { grid-template-columns: 1fr 1fr; }
  .product-grid { grid-template-columns: 1fr; }
  .voice-card { grid-template-columns: 1fr; }
  .voice-card .photo { padding: 16px 16px 0; }
  .shikake-grid, .usecase-grid { grid-template-columns: 1fr; }
  .series-grid { grid-template-columns: 1fr 1fr; }
  .product-card h3 { font-size: 22px; }
  .lead .big { font-size: 19px; }
}