/* ============================================================
   Purity Page - 純度別ページ共通CSS
   
   対象: K18, Pt900, SV925, K24 等すべての純度ページ
   テンプレ: page-templates/purity.php
   
   CSS変数(--gold-500等)は custom.css の :root で定義済み
============================================================ */

/* ============================================================
   ROOT - 純度ページ全体
============================================================ */
.purity-page {
  --pp-accent: var(--gold-500);
  --pp-accent-dark: var(--gold-700);
  --pp-accent-light: var(--gold-200);
  --pp-text: var(--ink);
}

/* 金属種別ごとのアクセントカラー */
.purity-page--platinum {
  --pp-accent: #708090;
  --pp-accent-dark: #4a5568;
  --pp-accent-light: #e2e8f0;
}
.purity-page--silver {
  --pp-accent: #8a8a8a;
  --pp-accent-dark: #555;
  --pp-accent-light: #ececec;
}
.purity-page--palladium {
  --pp-accent: #6b7a8f;
  --pp-accent-dark: #44516a;
  --pp-accent-light: #dde3eb;
}

/* ============================================================
   HERO
============================================================ */
.purity-hero {
  position: relative;
  padding: 48px 20px 56px;
  background: linear-gradient(135deg, #fafaf7 0%, #fff 60%);
  border-bottom: 1px solid var(--pp-accent-light);
  overflow: hidden;
}
.purity-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 20% 30%, rgba(201, 169, 97, 0.08), transparent 50%),
    radial-gradient(circle at 80% 70%, rgba(201, 169, 97, 0.06), transparent 50%);
  pointer-events: none;
}
.purity-hero--platinum::before {
  background:
    radial-gradient(circle at 20% 30%, rgba(112, 128, 144, 0.10), transparent 50%),
    radial-gradient(circle at 80% 70%, rgba(112, 128, 144, 0.06), transparent 50%);
}
.purity-hero--silver::before {
  background:
    radial-gradient(circle at 20% 30%, rgba(138, 138, 138, 0.10), transparent 50%),
    radial-gradient(circle at 80% 70%, rgba(138, 138, 138, 0.06), transparent 50%);
}
.purity-hero__inner {
  position: relative;
  max-width: 900px;
  margin: 0 auto;
  text-align: center;
}
.purity-hero__badge {
  display: inline-block;
  padding: 6px 16px;
  background: var(--pp-accent);
  color: #fff;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.12em;
  border-radius: 999px;
  margin-bottom: 18px;
}
.purity-hero__title {
  font-size: clamp(32px, 5vw, 48px);
  font-weight: 800;
  letter-spacing: 0.04em;
  margin: 0 0 16px;
  color: var(--pp-text);
  line-height: 1.15;
}
.purity-hero__purity {
  color: var(--pp-accent-dark);
  margin-right: 0.2em;
}
.purity-hero__action {
  color: var(--pp-text);
}
.purity-hero__lead {
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-2, #2a3450);
  margin: 0 auto 28px;
  max-width: 600px;
}
.purity-hero__price-card {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  padding: 20px 36px;
  background: #fff;
  border: 1px solid var(--pp-accent-light);
  border-top: 3px solid var(--pp-accent);
  border-radius: 6px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.05);
  margin: 0 auto 28px;
}
.purity-hero__price-label {
  font-size: 13px;
  color: var(--pp-accent-dark);
  letter-spacing: 0.08em;
  font-weight: 700;
  margin-bottom: 8px;
}
.purity-hero__price-value {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin-bottom: 6px;
}
.purity-hero__price-num {
  font-size: clamp(36px, 5vw, 48px);
  font-weight: 800;
  color: var(--pp-accent-dark);
  letter-spacing: 0.02em;
  font-family: 'Noto Sans JP', var(--sans);
}
.purity-hero__price-unit {
  font-size: 14px;
  color: var(--pp-accent-dark);
  font-weight: 600;
}
.purity-hero__price-note {
  font-size: 11px;
  color: #777;
}
.purity-hero__cta {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  margin-top: 8px;
}
.purity-hero__cta-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 24px;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.04em;
  border-radius: 4px;
  text-decoration: none;
  transition: transform 0.15s, box-shadow 0.15s;
}
.purity-hero__cta-btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(0,0,0,0.12);
}
.purity-hero__cta-btn--primary {
  background: var(--pp-accent);
  color: #fff;
}
.purity-hero__cta-btn--primary:hover { background: var(--pp-accent-dark); color: #fff; }
.purity-hero__cta-btn--secondary {
  background: #fff;
  color: var(--pp-accent-dark);
  border: 1px solid var(--pp-accent);
}
.purity-hero__cta-btn--secondary:hover {
  background: var(--pp-accent-light);
}
.purity-hero__cta-ico {
  display: inline-flex;
  width: 18px;
  height: 18px;
}
.purity-hero__cta-ico svg { width: 100%; height: 100%; }

/* ============================================================
   INTRO (導入)
============================================================ */
.purity-intro {
  padding: 32px 24px;
  background: #fff;
}
.purity-intro__body {
  font-size: 15px;
  line-height: 1.9;
  color: var(--ink-2, #2a3450);
}
.purity-intro__body p {
  margin: 0 0 1em;
}
.purity-intro__body p:last-child { margin-bottom: 0; }

/* ============================================================
   ABOUT (基礎・割金組成)
============================================================ */
.purity-about {
  margin: 40px 0;
}
.purity-about__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin-bottom: 24px;
}
.purity-about__card {
  padding: 24px;
  background: #fff;
  border: 1px solid #e8e3d4;
  border-radius: 6px;
}
.purity-about__card-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--pp-accent-dark);
  margin: 0 0 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--pp-accent-light);
  letter-spacing: 0.06em;
}
.purity-about__ratio {
  font-size: 15px;
  font-weight: 700;
  color: var(--pp-text);
  margin: 0 0 16px;
  text-align: center;
  padding: 10px;
  background: var(--pp-accent-light);
  border-radius: 4px;
}

/* 割金組成バー */
.purity-bar {
  display: flex;
  width: 100%;
  height: 36px;
  border-radius: 4px;
  overflow: hidden;
  margin: 0 0 16px;
  background: #f5f5f5;
}
.purity-bar__seg {
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  color: #fff;
  font-weight: 700;
  letter-spacing: 0.04em;
  position: relative;
  min-width: 0;
  white-space: nowrap;
  overflow: hidden;
}
.purity-bar__seg-label {
  padding: 0 8px;
}
.purity-bar__seg--1 { background: linear-gradient(90deg, #c9a961, #a68535); }
.purity-bar__seg--2 { background: linear-gradient(90deg, #c0c0c0, #999); }
.purity-bar__seg--3 { background: linear-gradient(90deg, #cd7f32, #a05a25); }
.purity-bar__seg--4 { background: linear-gradient(90deg, #708090, #4a5568); }
.purity-bar__seg--5 { background: linear-gradient(90deg, #b8860b, #8b6914); }

.purity-about__legend {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 16px;
}
.purity-about__legend-item {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
}
.purity-about__legend-dot {
  display: inline-block;
  width: 10px;
  height: 10px;
  border-radius: 50%;
}
.purity-about__legend-dot--1 { background: var(--gold-500); }
.purity-about__legend-dot--2 { background: #999; }
.purity-about__legend-dot--3 { background: #cd7f32; }
.purity-about__legend-dot--4 { background: #708090; }
.purity-about__legend-dot--5 { background: #b8860b; }
.purity-about__legend-pct {
  font-weight: 700;
  color: var(--pp-accent-dark);
}
.purity-about__body {
  font-size: 14px;
  line-height: 1.85;
  color: var(--ink-2, #2a3450);
}
.purity-about__body p {
  margin: 0 0 0.8em;
}
.purity-about__body p:last-child {
  margin-bottom: 0;
}

.purity-about__history {
  margin-top: 24px;
  padding: 20px 24px;
  background: linear-gradient(135deg, var(--pp-accent-light) 0%, #fff 100%);
  border-left: 3px solid var(--pp-accent);
  border-radius: 4px;
}
.purity-about__history-title {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 15px;
  font-weight: 700;
  color: var(--pp-accent-dark);
  margin: 0 0 12px;
}
.purity-about__history-icon {
  display: inline-flex;
  width: 18px;
  height: 18px;
  color: var(--pp-accent);
}
.purity-about__history-icon svg { width: 100%; height: 100%; }

/* ============================================================
   IDENTIFY (見分け方フロー)
============================================================ */
.purity-identify {
  margin: 40px 0;
}
.purity-identify__lead {
  text-align: center;
  font-size: 14px;
  line-height: 1.85;
  color: var(--ink-2, #2a3450);
  margin: 0 0 32px;
}
.purity-identify__steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.purity-identify__step {
  display: grid;
  grid-template-columns: 84px 1fr;
  gap: 0;
  background: #fff;
  border: 1px solid #e8e3d4;
  border-radius: 6px;
  overflow: hidden;
  position: relative;
}
.purity-identify__step:not(:last-child)::after {
  content: "";
  position: absolute;
  left: 41px;
  bottom: -10px;
  width: 2px;
  height: 14px;
  background: var(--pp-accent);
  z-index: 1;
}
.purity-identify__step:not(:last-child)::before {
  content: "";
  position: absolute;
  left: 36px;
  bottom: -16px;
  width: 0;
  height: 0;
  border-left: 6px solid transparent;
  border-right: 6px solid transparent;
  border-top: 6px solid var(--pp-accent);
  z-index: 2;
}
.purity-identify__step-num {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: linear-gradient(180deg, var(--pp-accent) 0%, var(--pp-accent-dark) 100%);
  color: #fff;
  padding: 16px 4px;
}
.purity-identify__step-num-label {
  font-size: 10px;
  letter-spacing: 0.1em;
  font-weight: 700;
  opacity: 0.85;
  margin-bottom: 2px;
}
.purity-identify__step-num-value {
  font-size: 28px;
  font-weight: 800;
  font-family: 'Noto Sans JP', var(--sans);
  line-height: 1;
}
.purity-identify__step-body {
  padding: 16px 20px;
}
.purity-identify__step-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--pp-accent-dark);
  margin: 0 0 8px;
}
.purity-identify__step-desc {
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-2, #2a3450);
  margin: 0 0 12px;
}
.purity-identify__step-hint {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  padding: 8px 12px;
  background: var(--pp-accent-light);
  border-radius: 4px;
}
.purity-identify__step-hint-label {
  flex-shrink: 0;
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--pp-accent-dark);
  background: #fff;
  padding: 2px 8px;
  border-radius: 999px;
  margin-top: 2px;
}
.purity-identify__step-hint-text {
  font-size: 13px;
  color: var(--ink-2, #2a3450);
  line-height: 1.6;
}
.purity-identify__note {
  margin-top: 24px;
  padding: 16px 20px;
  background: #fff8e7;
  border: 1px solid var(--pp-accent-light);
  border-radius: 4px;
  font-size: 13px;
  line-height: 1.75;
  color: var(--ink-2, #2a3450);
}
.purity-identify__note p {
  margin: 0;
}
.purity-identify__note p + p {
  margin-top: 6px;
}

/* ============================================================
   COMPARE (比較表)
============================================================ */
.purity-compare {
  margin: 40px 0;
}
.purity-compare__lead {
  text-align: center;
  font-size: 14px;
  line-height: 1.85;
  color: var(--ink-2, #2a3450);
  margin: 0 0 24px;
}
.purity-compare__table-wrap {
  overflow-x: auto;
  border: 1px solid #e8e3d4;
  border-radius: 6px;
  background: #fff;
}
.purity-compare__table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
  min-width: 480px;
}
.purity-compare__th {
  background: var(--pp-accent);
  color: #fff;
  font-weight: 700;
  text-align: center;
  padding: 12px 8px;
  letter-spacing: 0.04em;
  font-size: 13px;
}
.purity-compare__th--purity { width: 30%; }
.purity-compare__th--pct { width: 18%; }
.purity-compare__th--price { width: 28%; }
.purity-compare__th--detail { width: 24%; }
.purity-compare__td {
  padding: 14px 12px;
  border-bottom: 1px solid #f0e8d4;
  text-align: center;
}
.purity-compare__row:last-child .purity-compare__td {
  border-bottom: 0;
}
.purity-compare__row--self {
  background: var(--pp-accent-light);
}
.purity-compare__row--self .purity-compare__td {
  font-weight: 700;
  color: var(--pp-accent-dark);
}
.purity-compare__purity-name {
  font-size: 15px;
  font-weight: 700;
}
.purity-compare__badge {
  display: inline-block;
  padding: 2px 8px;
  margin-left: 6px;
  background: var(--pp-accent-dark);
  color: #fff;
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.05em;
  border-radius: 999px;
  vertical-align: middle;
}
.purity-compare__price-num {
  font-size: 18px;
  font-weight: 800;
  color: var(--pp-accent-dark);
  font-family: 'Noto Sans JP', var(--sans);
}
.purity-compare__price-unit {
  font-size: 12px;
  color: var(--ink-2, #2a3450);
  margin-left: 2px;
}
.purity-compare__link {
  font-size: 13px;
  color: var(--pp-accent-dark);
  font-weight: 700;
  text-decoration: none;
  border-bottom: 1px solid currentColor;
  padding-bottom: 1px;
  transition: opacity 0.15s;
}
.purity-compare__link:hover {
  opacity: 0.7;
}
.purity-compare__current {
  font-size: 11px;
  color: var(--pp-accent-dark);
  font-weight: 700;
}
.purity-compare__nolink {
  color: #aaa;
}
.purity-compare__note {
  text-align: center;
  font-size: 12px;
  color: #888;
  margin: 14px 0 0;
}

/* ============================================================
   EXAMPLES (製品例)
============================================================ */
.purity-examples {
  margin: 40px 0;
}
.purity-examples__lead {
  text-align: center;
  font-size: 14px;
  line-height: 1.85;
  color: var(--ink-2, #2a3450);
  margin: 0 0 24px;
}
.purity-examples__grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}
.purity-examples__item {
  background: #fff;
  border: 1px solid #e8e3d4;
  border-radius: 6px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}
.purity-examples__media {
  aspect-ratio: 4 / 3;
  background: #f7f5ee;
  overflow: hidden;
}
.purity-examples__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.purity-examples__content {
  padding: 14px 16px;
}
.purity-examples__name {
  font-size: 15px;
  font-weight: 700;
  color: var(--pp-accent-dark);
  margin: 0 0 6px;
}
.purity-examples__desc {
  font-size: 13px;
  line-height: 1.7;
  color: var(--ink-2, #2a3450);
  margin: 0;
}

/* ============================================================
   FAQ
============================================================ */
.purity-faq {
  margin: 40px 0;
}
.purity-faq__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.purity-faq__item {
  background: #fff;
  border: 1px solid #e8e3d4;
  border-radius: 6px;
  overflow: hidden;
}
.purity-faq__q {
  display: flex;
  align-items: flex-start;
  width: 100%;
  padding: 16px 20px;
  background: #fff;
  border: 0;
  cursor: pointer;
  text-align: left;
  font-size: 15px;
  font-weight: 700;
  color: var(--pp-accent-dark);
  font-family: inherit;
  transition: background 0.15s;
}
.purity-faq__q:hover {
  background: var(--pp-accent-light);
}
.purity-faq__q-mark {
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  background: var(--pp-accent);
  color: #fff;
  border-radius: 50%;
  font-size: 14px;
  font-weight: 800;
  margin-right: 12px;
  margin-top: -2px;
}
.purity-faq__q-text {
  flex: 1;
  line-height: 1.6;
}
.purity-faq__q-toggle {
  flex-shrink: 0;
  display: inline-flex;
  width: 18px;
  height: 18px;
  margin-left: 8px;
  transition: transform 0.2s;
  color: var(--pp-accent-dark);
}
.purity-faq__q-toggle svg { width: 100%; height: 100%; }
.purity-faq__q.is-open .purity-faq__q-toggle {
  transform: rotate(180deg);
}
.purity-faq__a {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows 0.25s ease;
}
.purity-faq__a > * {
  overflow: hidden;
  min-height: 0;
}
.purity-faq__a[aria-hidden="false"] {
  grid-template-rows: 1fr;
}
.purity-faq__a-mark,
.purity-faq__a-text {
  display: none;
}
.purity-faq__a[aria-hidden="false"] .purity-faq__a-mark,
.purity-faq__a[aria-hidden="false"] .purity-faq__a-text {
  display: block;
}
.purity-faq__a[aria-hidden="false"] {
  padding: 0 20px 18px 60px;
  background: #fafaf7;
  position: relative;
}
.purity-faq__a[aria-hidden="false"] .purity-faq__a-mark {
  position: absolute;
  left: 20px;
  top: 14px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  background: #fff;
  color: var(--pp-accent-dark);
  border: 1px solid var(--pp-accent);
  border-radius: 50%;
  font-size: 14px;
  font-weight: 800;
}
.purity-faq__a-text {
  font-size: 14px;
  line-height: 1.85;
  color: var(--ink-2, #2a3450);
  padding-top: 14px;
}
.purity-faq__a-text p {
  margin: 0 0 0.8em;
}
.purity-faq__a-text p:last-child {
  margin-bottom: 0;
}

/* ============================================================
   RELATED (関連純度ページ)
============================================================ */
.purity-related {
  margin: 40px 0;
}
.purity-related__lead {
  text-align: center;
  font-size: 14px;
  line-height: 1.85;
  color: var(--ink-2, #2a3450);
  margin: 0 0 24px;
}
.purity-related__grid {
  list-style: none;
  margin: 0 0 24px;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
}
.purity-related__item {
  /* card layout handled by .purity-related__card */
}
.purity-related__card {
  display: grid;
  grid-template-columns: 1fr auto;
  grid-template-rows: auto auto;
  align-items: center;
  gap: 4px 12px;
  padding: 14px 16px;
  background: #fff;
  border: 1px solid #e8e3d4;
  border-radius: 6px;
  text-decoration: none;
  transition: border-color 0.15s, transform 0.15s, box-shadow 0.15s;
}
.purity-related__card:hover {
  border-color: var(--pp-accent);
  transform: translateY(-2px);
  box-shadow: 0 4px 10px rgba(0,0,0,0.06);
}
.purity-related__card--gold:hover { border-color: var(--gold-500); }
.purity-related__card--platinum:hover { border-color: #708090; }
.purity-related__card--silver:hover { border-color: #8a8a8a; }
.purity-related__purity {
  font-size: 16px;
  font-weight: 800;
  color: var(--pp-accent-dark);
  letter-spacing: 0.02em;
  grid-column: 1 / 2;
}
.purity-related__price-wrap {
  grid-column: 1 / 2;
  grid-row: 2 / 3;
  display: flex;
  align-items: baseline;
  gap: 2px;
}
.purity-related__price {
  font-size: 14px;
  font-weight: 700;
  color: var(--ink-2, #2a3450);
  font-family: 'Noto Sans JP', var(--sans);
}
.purity-related__price-unit {
  font-size: 11px;
  color: #888;
}
.purity-related__arrow {
  grid-column: 2 / 3;
  grid-row: 1 / 3;
  font-size: 18px;
  color: var(--pp-accent);
  font-weight: 700;
}
.purity-related__pillar {
  text-align: center;
  margin-top: 8px;
}
.purity-related__pillar-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 20px;
  background: var(--pp-accent-light);
  color: var(--pp-accent-dark);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.05em;
  border-radius: 4px;
  text-decoration: none;
  transition: background 0.15s;
}
.purity-related__pillar-link:hover {
  background: var(--pp-accent);
  color: #fff;
}
.purity-related__pillar-link svg {
  width: 14px;
  height: 14px;
}

/* ============================================================
   RESPONSIVE - スマホ
============================================================ */
@media (max-width: 768px) {
  .purity-hero {
    padding: 32px 16px 36px;
  }
  .purity-hero__title {
    font-size: 30px;
  }
  .purity-hero__price-card {
    padding: 16px 24px;
    width: 100%;
    max-width: 360px;
  }
  .purity-hero__price-num {
    font-size: 36px;
  }
  .purity-hero__cta {
    flex-direction: column;
    align-items: stretch;
  }
  .purity-hero__cta-btn {
    justify-content: center;
  }

  .purity-about__grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }
  .purity-about__card {
    padding: 18px;
  }

  .purity-identify__step {
    grid-template-columns: 64px 1fr;
  }
  .purity-identify__step-num-value {
    font-size: 22px;
  }
  .purity-identify__step:not(:last-child)::after {
    left: 31px;
  }
  .purity-identify__step:not(:last-child)::before {
    left: 26px;
  }
  .purity-identify__step-body {
    padding: 14px 16px;
  }

  .purity-compare__table {
    font-size: 13px;
  }
  .purity-compare__th,
  .purity-compare__td {
    padding: 10px 6px;
  }
  .purity-compare__price-num {
    font-size: 16px;
  }

  .purity-examples__grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
  }
  .purity-examples__name {
    font-size: 14px;
  }
  .purity-examples__desc {
    font-size: 12px;
  }

  .purity-faq__q {
    font-size: 14px;
    padding: 14px 16px;
  }
  .purity-faq__a[aria-hidden="false"] {
    padding: 0 16px 16px 52px;
  }
  .purity-faq__a[aria-hidden="false"] .purity-faq__a-mark {
    left: 16px;
  }

  .purity-related__grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
  }
  .purity-related__card {
    padding: 12px 14px;
  }
}

@media (max-width: 480px) {
  .purity-hero__title {
    font-size: 26px;
  }
  .purity-hero__price-num {
    font-size: 32px;
  }
  .purity-examples__grid {
    grid-template-columns: 1fr;
  }
}