/* ============================================
   page-perio.css — 下層ページ（歯周病治療）
   ============================================ */

/* --- Base --- */
#content {
  padding: 0 !important;
  min-height: auto !important;
}

#main {
  letter-spacing: 0;
  line-height: 1.8;
}

/* --- Title Holder (Hero) --- */
.title-holder {
  background: url("../img/perio/mv_bg.webp") center center / cover no-repeat, #5e6d91;
  height: calc(27.7778vw);
  min-height: 260px;
  max-height: 500px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

.title-holder::before {
  content: "";
  position: absolute;
  inset: 0;
  background: rgba(40, 42, 48, 0.4);
  max-width: none;
  width: 100%;
  height: 100%;
  top: 0;
  left: 0;
}

.title-holder .title-holder__inner {
  position: relative;
  z-index: 2;
  text-align: center;
  color: #fff;
  top: auto;
  background: rgba(30, 33, 40, 0.45);
  padding: 28px 48px;
  border-radius: 4px;
}

.title-holder .title-holder__en {
  font-size: 0.875rem;
  color: #c5c9d1;
  letter-spacing: 0.1em;
  margin-bottom: 12px;
}

.title-holder h1 {
  font-size: 2rem;
  font-weight: 400;
  letter-spacing: 0.12em;
  line-height: 1.6;
  color: #fff;
}

/* --- Breadcrumb --- */
#bread_area {
  border-bottom: 1px solid #eee;
}

#bread {
  padding: 12px 30px;
  font-size: 0.75rem;
  color: #898c93;
  max-width: 1080px;
  margin: 0 auto;
}

#bread li {
  color: #898c93;
}

#bread li a {
  color: #898c93;
  text-decoration: none;
}

#bread li a:hover {
  text-decoration: underline;
}

/* --- Container --- */
.container {
  max-width: 1080px;
  width: 100%;
  margin: 0 auto;
  padding: 0 30px;
  box-sizing: border-box;
}

/* =========================================
   Sections
   ========================================= */
.perio-section {
  padding: 100px 0;
}

.perio-section--gray {
  background: #f1f2f6;
}

.perio-section--dark {
  background: url("../img/perio/sec07_bg.webp") center center / cover no-repeat, #3b4b6e;
  color: #fff;
}

.perio-section--dark .perio-section__title,
.perio-section--dark .perio-section__num,
.perio-section--dark .perio-sub-heading,
.perio-section--dark h3,
.perio-section--dark h4,
.perio-section--dark p {
  color: #fff;
}

.perio-section--dark .perio-section__en {
  color: #c5c9d1;
}

.perio-section--dark .perio-highlight {
  background: rgba(255, 255, 255, 0.08);
  border-left-color: rgba(255, 255, 255, 0.4);
}

.perio-section--dark .perio-highlight__main {
  color: #fff;
}

.perio-section--dark .perio-grid__item {
  background: rgba(255, 255, 255, 0.06);
  border-color: rgba(255, 255, 255, 0.15);
}

.perio-section--dark .perio-grid__title {
  color: #fff;
}

.perio-section--dark .perio-grid__txt {
  color: #c5c9d1;
}

/* --- Section Header --- */
.perio-section__header {
  text-align: center;
  margin-bottom: 48px;
  max-width: 100%;
}

.perio-section__num {
  display: none;
}

.perio-section__title {
  font-family: "Zen Old Mincho", serif;
  font-size: 2.25rem;
  font-weight: 400;
  line-height: 1.6;
  color: #3b5db4;
  letter-spacing: 0.15em;
  margin-bottom: 16px;
}

/* .perio-section__title br { display: none; } */

.perio-section__en {
  display: none;
}

/* --- Section Body --- */
.perio-section__body {
  max-width: 820px;
  margin: 0 auto;
  font-size: 0.9375rem;
  line-height: 2;
  color: #4a4e5a;
}

.perio-section__body p + p {
  margin-top: 1.6em;
}

.perio-section__body.mb30 {
  margin-bottom: 30px;
}

.perio-section__body.mb40 {
  margin-bottom: 40px;
}

/* --- Lead Text --- */
.perio-lead {
  font-size: 1rem;
  line-height: 2;
  color: #4a4e5a;
  border-left: 3px solid #3b5db4;
  padding-left: 20px;
  margin-bottom: 32px;
}

/* --- Sub Heading --- */
.perio-sub-heading {
  text-align: center;
  font-size: 1.125rem;
  font-weight: 400;
  color: #656c7d;
  margin-bottom: 32px;
  line-height: 1.8;
}

/* =========================================
   Highlight Box
   ========================================= */
.perio-highlight {
  background: #f1f2f6;
  border-left: 4px solid #3b5db4;
  padding: 32px 40px;
  margin-top: 48px;
  max-width: 820px;
  margin-left: auto;
  margin-right: auto;
}

.perio-highlight--top {
  margin-top: 0;
  margin-bottom: 32px;
}

.perio-highlight__main {
  font-size: 1.125rem;
  font-weight: 400;
  line-height: 1.9;
  color: #282a30;
}

.perio-highlight__title {
  font-size: 1.5rem;
  font-weight: 700;
  color: #282a30;
  margin-bottom: 8px;
  line-height: 1.6;
}

.perio-highlight__sub {
  font-size: 0.875rem;
  color: #656c7d;
  margin-top: 12px;
  line-height: 1.8;
}

/* =========================================
   Grid Layout (2col / 3col)
   ========================================= */
.perio-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 32px;
  margin-top: 40px;
}

.perio-grid--2col .perio-evidence,
.perio-grid--2col .perio-grid__item {
  width: calc(50% - 16px);
}

.perio-grid--3col .perio-grid__item {
  width: calc(33.333% - 22px);
}

/* --- Grid Item --- */
.perio-grid__item {
  border: 1px solid #d6dbe9;
  background: #fff;
  padding: 28px 24px;
  box-sizing: border-box;
  text-align: center;
}

.perio-grid__title {
  font-size: 1.125rem;
  font-weight: 400;
  color: #656c7d;
  margin-bottom: 12px;
  line-height: 1.6;
}

.perio-grid__txt {
  font-size: 0.875rem;
  line-height: 1.8;
  color: #656c7d;
}

/* =========================================
   Evidence (Before/After)
   ========================================= */
.perio-evidence {
  border: 1px solid #d6dbe9;
  overflow: hidden;
  background: #fff;
}

.perio-evidence__img {
  background: #e8eaf0;
  min-height: 180px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.875rem;
  color: #656c7d;
  text-align: center;
  line-height: 1.6;
  padding: 20px;
}

.perio-evidence__body {
  padding: 20px;
}

.perio-evidence__body h3 {
  font-size: 1rem;
  font-weight: 400;
  margin-bottom: 8px;
  color: #656c7d;
}

.perio-evidence__body p {
  font-size: 0.875rem;
  line-height: 1.8;
  color: #656c7d;
}

/* =========================================
   Steps (遠隔診断フロー)
   ========================================= */
.perio-steps {
  display: flex;
  gap: 24px;
  margin-top: 48px;
}

.perio-steps__item {
  flex: 1;
  text-align: center;
  padding: 28px 20px;
  border: 1px solid #d6dbe9;
  background: #fff;
  position: relative;
}

.perio-steps__item + .perio-steps__item::before {
  content: "";
  position: absolute;
  left: -16px;
  top: 50%;
  transform: translateY(-50%);
  width: 0;
  height: 0;
  border-top: 8px solid transparent;
  border-bottom: 8px solid transparent;
  border-left: 8px solid #3b5db4;
}

.perio-steps__num {
  font-size: 0.75rem;
  color: #3b5db4;
  letter-spacing: 0.1em;
  margin-bottom: 8px;
}

.perio-steps__title {
  font-size: 1.125rem;
  font-weight: 400;
  margin-bottom: 8px;
  color: #656c7d;
}

.perio-steps__txt {
  font-size: 0.8125rem;
  line-height: 1.8;
  color: #656c7d;
}

/* =========================================
   Checklist
   ========================================= */
.perio-checklist {
  max-width: 820px;
  margin: 32px auto 0;
  list-style: none;
  padding: 0;
}

.perio-checklist li {
  position: relative;
  padding: 16px 16px 16px 40px;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: #282a30;
  border-bottom: 1px solid #e0e3eb;
}

.perio-checklist li:first-child {
  border-top: 1px solid #e0e3eb;
}

.perio-checklist li::before {
  content: "✓";
  position: absolute;
  left: 12px;
  top: 16px;
  color: #3b5db4;
  font-weight: 700;
}

/* =========================================
   Signature
   ========================================= */
.perio-signature {
  text-align: center;
  margin-top: 48px;
  font-size: 0.9375rem;
  line-height: 2;
  color: #656c7d;
}

/* =========================================
   CTA (お問い合わせ)
   ========================================= */
.perio-cta {
  background: #D6DBE9;
  padding: 80px 0;
  text-align: center;
  color: #282a30;
}

.perio-cta__title {
  font-size: 1.5rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  margin-bottom: 12px;
  color: #282a30;
}

.perio-cta__txt {
  font-size: 0.875rem;
  color: #656c7d;
  margin-bottom: 32px;
}

.perio-cta__btns {
  display: flex;
  justify-content: center;
  gap: 24px;
  flex-wrap: wrap;
  align-items: stretch;
}

/* --- ボタン共通サイズ（電話番号基準で均等） --- */
.perio-cta__tel,
.perio-cta .btn {
  margin: 0;
  flex: 1 1 0;
  max-width: 360px;
}

.perio-cta__tel a,
.perio-cta .btnTel,
.perio-cta .btn a {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  color: #fff;
  text-decoration: none;
  font-size: 1.25rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  padding: 20px 48px;
  border-radius: 6px;
  border: none;
  transition: background 0.3s;
  width: 100%;
  height: 100%;
  box-sizing: border-box;
}

/* --- 電話ボタン（オレンジ） --- */
.perio-cta__tel a,
.perio-cta .btnTel {
  background: #e66f41;
}

.perio-cta__tel a:hover,
.perio-cta .btnTel:hover {
  background: #d45e33;
}

/* --- メールボタン（グリーン） --- */
.perio-cta .btn a {
  background: #5a8a3c;
  max-width: none;
  margin: 0;
}

.perio-cta .btn a:hover {
  background: #4a7530;
}

/* =========================================
   Utility
   ========================================= */
.fnt-arial {
  font-family: "Arial", "Helvetica Neue", sans-serif;
}

.mb30 {
  margin-bottom: 30px;
}

.mb40 {
  margin-bottom: 40px;
}

.pc {
  display: block;
}

/* =========================================
   Responsive (tablet)
   ========================================= */
@media screen and (max-width: 960px) {
  .perio-section {
    padding: 72px 0;
  }

  .perio-section__title {
    font-size: 1.75rem;
  }

  .perio-grid--2col .perio-evidence,
  .perio-grid--2col .perio-grid__item {
    width: 100%;
  }

  .perio-grid--3col .perio-grid__item {
    width: calc(50% - 16px);
  }

  .perio-steps {
    flex-direction: column;
  }

  .perio-steps__item + .perio-steps__item::before {
    display: none;
  }
}

/* =========================================
   Responsive (mobile)
   ========================================= */
@media screen and (max-width: 767px) {
  .title-holder {
    height: 200px;
    min-height: 180px;
  }

  .title-holder h1 {
    font-size: 1.375rem;
  }

  .perio-section {
    padding: 56px 0;
  }

  .perio-section__header {
    margin-bottom: 32px;
  }

  .perio-section__title {
    font-size: 1.375rem;
  }

  .perio-section__body {
    font-size: 0.875rem;
  }

  .perio-lead {
    font-size: 0.875rem;
    padding-left: 16px;
  }

  .perio-highlight {
    padding: 24px;
  }

  .perio-highlight__title {
    font-size: 1.25rem;
  }

  .perio-highlight__main {
    font-size: 1rem;
  }

  .perio-grid--2col .perio-evidence,
  .perio-grid--2col .perio-grid__item,
  .perio-grid--3col .perio-grid__item {
    width: 100%;
  }

  .perio-cta {
    padding: 56px 0;
  }

  .perio-cta__title {
    font-size: 1.25rem;
  }

  .perio-cta__tel a,
  .perio-cta .btnTel,
  .perio-cta .btn a {
    font-size: 1.125rem;
    padding: 16px 28px;
  }

  .perio-cta__btns {
    flex-direction: column;
    align-items: center;
  }

  .perio-cta__tel,
  .perio-cta .btn {
    flex: 0 1 100%;
    max-width: 360px;
  }

  .pc {
    display: none;
  }

  .container {
    padding: 0 20px;
  }
}