/* ==============================
   Base / Reset
============================== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Hiragino Kaku Gothic ProN", Meiryo, sans-serif;
  color: #222;
  line-height: 1.7;
  background: #fff;
}

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

a {
  color: inherit;
  text-decoration: none;
}

/* ==============================
   WF Label（セクション名表示）
============================== */
.wf-label {
  display: block;
  background: #444;
  color: #fff;
  font-size: 11px;
  font-weight: bold;
  letter-spacing: 0.08em;
  padding: 3px 10px;
  position: relative;
  z-index: 1;
}

.wf-label--light {
  background: #777;
  color: #fff;
}

/* ==============================
   Image Placeholder
============================== */
.img-placeholder {
  background: #d0d0d0;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  color: #666;
  font-size: 13px;
  line-height: 1.4;
  width: 100%;
}

.img-fv         { height: 260px; }
.img-solution   { height: 260px; }
.img-effect     { height: 200px; }
.img-nano       { height: 260px; }
.img-science    { height: 200px; margin-bottom: 1rem; }
.img-step       { height: 180px; }

/* ==============================
   Section Common
============================== */
section {
  position: relative;
}

.section-inner {
  max-width: 1080px;
  margin: 0 auto;
  padding: 3rem 1.2rem;
}

.section-title {
  font-size: 1.4rem;
  font-weight: bold;
  line-height: 1.5;
  margin-bottom: 1.8rem;
  color: #111;
  text-align: center;
}

.section-title--white {
  color: #fff;
}

/* ==============================
   CTA Button
============================== */
.btn-cta {
  display: inline-block;
  background: #333;
  color: #fff;
  font-size: 1rem;
  font-weight: bold;
  padding: 0.9rem 2.2rem;
  border-radius: 4px;
  text-align: center;
  cursor: pointer;
}

/* ==============================
   FV
============================== */
#fv {
  background: #f5f5f5;
}

.fv-inner {
  max-width: 1080px;
  margin: 0 auto;
  padding: 3rem 1.2rem;
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.fv-text {
  order: 1;
}

.fv-img {
  order: 0;
}

.fv-images {
  display: flex;
  gap: 0.8rem;
}

.fv-cta-wrap {
  text-align: center;
}

.fv-catch {
  font-size: 1.5rem;
  font-weight: bold;
  line-height: 1.5;
  color: #111;
  margin-bottom: 1.2rem;
}

.fv-badges {
  display: flex;
  flex-wrap: nowrap;
  gap: 0.5rem;
  margin-bottom: 1.8rem;
  justify-content: center;
}

.fv-badge {
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  width: 100px;
  height: 100px;
  border-radius: 50%;
  border: 2px solid #888;
  background: #fff;
  font-size: 1rem;
  color: #333;
  font-weight: bold;
  line-height: 1.4;
  padding: 0.5rem;
}

/* ==============================
   お悩みセクション
============================== */
#worries {
  background: #ebebeb;
}

.worries-list {
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
}

.worry-card {
  background: #fff;
  border-left: 4px solid #555;
  padding: 1rem 1.1rem;
  font-size: 0.95rem;
  border-radius: 2px;
}

/* ==============================
   ソリューション紹介
============================== */
#solution {
  background: #fff;
}

.solution-inner {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.solution-text p {
  font-size: 0.97rem;
  color: #444;
}

/* ==============================
   効果説明セクション
============================== */
#effects {
  background: #f5f5f5;
}

.effects-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

.effect-item {
  background: #fff;
  border-radius: 4px;
  overflow: hidden;
  border: 1px solid #ddd;
}

.effect-body {
  padding: 1.2rem;
}

.effect-body h3 {
  font-size: 1.05rem;
  font-weight: bold;
  color: #111;
  margin-bottom: 0.7rem;
}

.effect-body p {
  font-size: 0.93rem;
  color: #555;
}

/* ==============================
   ナノバブルとは
============================== */
#what-is-nanobubble {
  background: #ebebeb;
  color: #222;
}

.nano-inner {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.nano-text p {
  font-size: 0.97rem;
  color: #444;
}

/* ==============================
   科学的検証
============================== */
#science {
  background: #ebebeb;
}

.science-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

.science-item {
  background: #fff;
  padding: 1.5rem;
  border-radius: 4px;
  border: 1px solid #ddd;
}

.science-item h3 {
  font-size: 1.05rem;
  font-weight: bold;
  color: #111;
  margin-bottom: 0.8rem;
}

.science-item p {
  font-size: 0.93rem;
  color: #555;
  margin-bottom: 0.6rem;
}

.note {
  font-size: 0.82rem !important;
  color: #888 !important;
}

/* ==============================
   お客様の声
============================== */
#reviews {
  background: #fff;
}

.reviews-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

.review-card {
  background: #f5f5f5;
  border: 1px solid #ddd;
  border-radius: 4px;
  padding: 1.4rem;
}

.review-stars {
  color: #555;
  font-size: 1.1rem;
  margin-bottom: 0.6rem;
}

.review-text {
  font-size: 0.95rem;
  color: #444;
  margin-bottom: 0.8rem;
}

.review-source {
  font-size: 0.82rem;
  color: #888;
}

/* ==============================
   品質アピール
============================== */
#quality {
  background: #f5f5f5;
}

.quality-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

.quality-item {
  background: #fff;
  border-radius: 4px;
  padding: 1.5rem;
  border: 1px solid #ddd;
}

.img-quality {
  height: 160px;
  margin-bottom: 1rem;
  border-radius: 3px;
}

.quality-item h3 {
  font-size: 1rem;
  font-weight: bold;
  color: #111;
  margin-bottom: 0.6rem;
}

.quality-item p {
  font-size: 0.93rem;
  color: #555;
}

.quality-footer {
  margin-top: 2rem;
  text-align: center;
  font-size: 1rem;
  font-weight: bold;
  color: #333;
}

/* ==============================
   取り付け方法
============================== */
#installation {
  background: #fff;
}

.steps-list {
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
  margin-bottom: 1.5rem;
  max-width: 560px;
}

.step-row {
  display: flex;
  align-items: center;
  gap: 1.2rem;
}

.img-step-small {
  width: 100px;
  height: 80px;
  flex-shrink: 0;
  border-radius: 3px;
}

.step-row-text {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.step-num {
  display: inline-block;
  background: #333;
  color: #fff;
  font-size: 0.78rem;
  font-weight: bold;
  padding: 0.2rem 0.7rem;
  border-radius: 3px;
  width: fit-content;
}

.step-text {
  font-size: 0.97rem;
  font-weight: bold;
  color: #111;
}

.step-note {
  font-size: 0.78rem;
  color: #888;
  border-left: 3px solid #ccc;
  padding-left: 0.9rem;
  max-width: 480px;
}

/* ==============================
   FAQ（常時展開）
============================== */
#faq {
  background: #ebebeb;
}

.faq-wrap {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.faq-item {
  background: #fff;
  border-radius: 6px;
  padding: 1.4rem 1.6rem;
  box-shadow: 0 2px 8px rgba(0,0,0,0.10);
}

.faq-q-static {
  font-size: 0.97rem;
  font-weight: bold;
  color: #111;
  margin-bottom: 0.7rem;
}

.faq-a-static p {
  font-size: 0.93rem;
  color: #555;
  padding-left: 1rem;
}

/* ==============================
   クロージング
============================== */
#closing {
  background: #f5f5f5;
  text-align: center;
}

.closing-inner {
  text-align: center;
}

.cta-mid-inner {
  text-align: center;
  padding-top: 2rem;
  padding-bottom: 2rem;
}

.cta-mid-text {
  font-size: 1rem;
  color: #333;
  margin-bottom: 1.2rem;
}

.closing-catch {
  font-size: 1.4rem;
  color: #111;
  margin-bottom: 1.2rem;
}

.closing-body {
  font-size: 0.97rem;
  color: #555;
  margin-bottom: 2rem;
  max-width: 540px;
  margin-left: auto;
  margin-right: auto;
}

.closing-sub {
  font-size: 0.85rem;
  color: #777;
  margin-bottom: 0.8rem;
}

/* ==============================
   PC (768px+)
============================== */
@media (min-width: 768px) {

  /* FV */
  .fv-inner {
    flex-direction: row;
    align-items: center;
    gap: 3rem;
  }

  .fv-text {
    order: 0;
    flex: 1;
  }

  .fv-img {
    order: 1;
    flex: 1;
  }


  .fv-catch {
    font-size: 1.9rem;
  }

  .img-fv {
    height: 360px;
  }

  /* お悩み：1列のまま */
  .worries-list {
    max-width: 640px;
    margin: 0 auto;
  }

  /* ソリューション */
  .solution-inner {
    flex-direction: row;
    align-items: center;
    gap: 3rem;
  }

  .solution-img {
    flex: 1;
  }

  .solution-text {
    flex: 1;
  }

  .img-solution {
    height: 320px;
  }

  /* 効果説明 */
  .effects-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  /* 科学的検証 */
  .science-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  /* お客様の声 */
  .reviews-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  /* 品質アピール */
  .quality-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  /* ナノバブルとは */
  .nano-inner {
    flex-direction: row;
    align-items: flex-start;
    gap: 3rem;
  }

  .nano-text {
    flex: 1;
  }

  .nano-img {
    flex: 1;
  }

  .img-nano {
    height: 320px;
  }

  /* section-title */
  .section-title {
    font-size: 1.7rem;
  }

  .closing-catch {
    font-size: 1.8rem;
  }

}