/* ==========================================================================
   product.css — 商品ページ専用スタイル（product-main1 〜 product-main12）
   - 商品ページ独自フォント（Manrope / Zen Old Mincho / Zen Kaku Gothic New）
   - Site header（.site-header）構造（TOP の .header とは別系統）
   - Hero / About / Strengths / Cases / Voices / Specs / Contact / Footer / Quality / Products overlay
   - 商品ページ用レスポンシブ @media
   ※ common.css と一部セレクタが重複する場合は本ファイルが後勝ちで上書きする
   ========================================================================== */

:root {
  --ink: #000000;
  --ink-2: #0a0a0a;
  --ink-3: #141414;
  --paper: #ffffff;
  --paper-2: rgba(255,255,255,0.85);
  --paper-3: rgba(255,255,255,0.6);
  --paper-4: rgba(255,255,255,0.4);
  --line: rgba(255,255,255,0.12);
  --line-soft: rgba(255,255,255,0.06);
  --coral: #fd776d;
  --amber: #f4a261;

  --font-display: 'Manrope', system-ui, sans-serif;
  --font-serif: 'Instrument Serif', serif;
  --font-jp: 'Zen Kaku Gothic New', 'Hiragino Sans', sans-serif;
  --font-jp-serif: 'Zen Old Mincho', 'Shippori Mincho B1', 'Hiragino Mincho ProN', serif;
  --font-body: 'Manrope', 'Zen Kaku Gothic New', sans-serif;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-body);
  background: var(--ink);
  color: var(--paper);
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }

body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image: radial-gradient(circle at 1px 1px, rgba(255,255,255,0.06) 1px, transparent 0);
  background-size: 24px 24px;
  pointer-events: none;
  z-index: 1;
}
section, nav { position: relative; z-index: 2; }
section { scroll-margin-top: 80px; }
body { padding-top: 60px; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 40px; }
.container-wide { max-width: 1400px; margin: 0 auto; padding: 0 40px; }

/* ============== Site header ============== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(0,0,0,0.78);
  backdrop-filter: blur(18px) saturate(140%);
  -webkit-backdrop-filter: blur(18px) saturate(140%);
  border-bottom: 1px solid var(--line-soft);
}
.site-header-inner {
  max-width: 1400px;
  margin: 0 auto;
  padding: 18px 40px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.site-brand {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 14px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--paper);
  line-height: 1;
  display: inline-flex;
  align-items: baseline;
}
.site-brand .brand-jp {
  font-family: var(--font-jp-serif);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.18em;
  color: var(--paper-3);
  margin-left: 12px;
  text-transform: none;
}
.site-nav {
  display: flex;
  align-items: center;
  gap: 32px;
  font-family: var(--font-display);
  font-size: 12.5px;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}
.site-nav a, .site-nav button {
  color: var(--paper-2);
  transition: color 0.25s ease;
  background: none;
  border: none;
  padding: 0;
  font: inherit;
  letter-spacing: inherit;
  text-transform: inherit;
  cursor: pointer;
}
.site-nav a:hover, .site-nav button:hover { color: var(--paper); }
.site-nav .nav-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  border: 1px solid var(--paper-3);
  border-radius: 999px;
  color: var(--paper);
  transition: background 0.25s ease, border-color 0.25s ease, color 0.25s ease;
}
.site-nav .nav-cta:hover { background: var(--paper); color: var(--ink); border-color: var(--paper); }

/* ============== Wordmark ============== */
.wordmark {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--paper);
  user-select: none;
}
.wordmark .letter {
  display: inline-block;
  overflow: hidden;
  line-height: 1;
  vertical-align: bottom;
  padding: 0.08em 0.01em 0.2em 0.01em;
}
.wordmark .letter__inner {
  display: inline-block;
  transform: translateY(130%);
  will-change: transform, color;
  color: var(--paper);
}
.wordmark .letter__inner { transform: none; }
.wordmark.animate .letter__inner { transform: translateY(130%); }
.wordmark.animate.in .letter__inner {
  animation:
    w-rise 1.1s cubic-bezier(0.22, 1, 0.36, 1) forwards,
    w-color 1.5s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}
@keyframes w-rise {
  from { transform: translateY(130%); }
  to   { transform: translateY(0); }
}
@keyframes w-color {
  0%   { color: var(--amber); }
  45%  { color: var(--coral); }
  100% { color: #ffffff; }
}

.section-header {
  text-align: left;
  margin-bottom: 48px;
}
.section-header .wordmark {
  font-size: clamp(44px, 6.6vw, 92px);
  margin-bottom: 12px;
  white-space: nowrap;
}
@media (max-width: 600px) {
  .section-header .wordmark { white-space: normal; }
}
.section-jp {
  font-family: var(--font-jp-serif);
  font-size: 22px;
  font-weight: 500;
  color: var(--paper-2);
  letter-spacing: 0.04em;
}

/* ============== Hero ============== */
.hero {
  background: var(--ink);
  padding: 70px 0 24px;
}
.hero-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(44px, 6.6vw, 92px);
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--paper);
  margin-bottom: 14px;
  white-space: nowrap;
}
@media (max-width: 600px) {
  .hero-title { white-space: normal; }
}
.hero-jp {
  font-family: var(--font-jp-serif);
  font-size: clamp(16px, 1.4vw, 20px);
  font-weight: 500;
  color: var(--paper-3);
  letter-spacing: 0.08em;
  margin-bottom: 28px;
}
.hero-image-wrap {
  position: relative;
  width: 100%;
  text-align: center;
  opacity: 0;
  transform: translateY(20px);
  animation: hero-img-in 1.4s cubic-bezier(0.4, 0, 0.2, 1) 0.4s forwards;
}
.hero-image-wrap::after {
  content: '';
  position: absolute;
  left: 50%;
  bottom: -18px;
  transform: translateX(-50%);
  width: min(520px, 70%);
  height: 36px;
  background: radial-gradient(ellipse at center, rgba(255,255,255,0.18) 0%, rgba(255,255,255,0.06) 35%, transparent 75%);
  filter: blur(6px);
  pointer-events: none;
}
.hero-image-wrap img {
  position: relative;
  display: inline-block;
  width: 100%;
  max-width: 620px;
  height: auto;
  object-fit: contain;
  z-index: 1;
}
@keyframes hero-img-in {
  to { opacity: 1; transform: translateY(0); }
}

/* ============== Content sections ============== */
section.content { padding: 110px 0; }

/* About — left-aligned */
.about-flange { background: var(--ink); }
.about-flange .about-jp-headline {
  text-align: left;
  font-family: var(--font-jp-serif);
  font-weight: 700;
  font-size: clamp(26px, 3.8vw, 42px);
  line-height: 1.55;
  letter-spacing: 0.06em;
  color: var(--paper);
  margin-bottom: 40px;
  max-width: 860px;
  margin-left: auto;
  margin-right: auto;
}

/* Strengths */
.strengths {
  background: var(--ink);
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
}

/* ============== Cases ============== */
.cases {
  background: var(--ink);
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
}
.cases-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 36px;
  max-width: 1200px;
  margin: 0 auto;
}
.cases-grid--single {
  grid-template-columns: minmax(0, 520px);
  justify-content: center;
}
.case-card {
  background: transparent;
  border: none;
  padding: 0;
  cursor: pointer;
}
.case-image {
  position: relative;
  margin-bottom: 18px;
  height: 240px;
  background: transparent;
  padding: 0;
  border: 1px solid #fff;
  border-radius: 12px;
  overflow: hidden;
  transition: border-color 0.3s ease;
}
.case-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s cubic-bezier(0.4, 0.1, 0.3, 1);
}
.case-card:hover .case-image { border-color: var(--coral); }
.case-card:hover .case-image img { transform: scale(1.04); }
.case-eyebrow {
  font-family: var(--font-display);
  font-size: 10.5px;
  font-weight: 600;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--coral);
  margin-bottom: 10px;
}
.case-title {
  font-family: var(--font-jp-serif);
  font-size: 17px;
  font-weight: 700;
  color: var(--paper);
  line-height: 1.55;
  margin-bottom: 10px;
  letter-spacing: 0.02em;
}
.case-client {
  font-family: var(--font-jp);
  font-size: 12px;
  color: var(--paper-3);
  margin-bottom: 12px;
  letter-spacing: 0.04em;
}
.case-summary {
  font-family: var(--font-jp);
  font-size: 13px;
  color: var(--paper-2);
  line-height: 1.85;
  margin-bottom: 16px;
}
.case-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-display);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--paper);
  border-bottom: 1px solid var(--paper-4);
  padding-bottom: 4px;
  transition: border-color 0.3s, color 0.3s;
}
.case-card:hover .case-link {
  border-color: var(--coral);
  color: var(--coral);
}

/* ============== Customer voice (YouTube + Swiper slider) ============== */
.voices {
  background: var(--ink);
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
}
.voices-stage {
  max-width: 980px;
  margin: 0 auto;
}
.video-wrap {
  position: relative;
  width: 100%;
  padding-bottom: 56.25%;
  height: 0;
  overflow: hidden;
  border-radius: 14px;
  border: 1px solid var(--line);
  background: #000;
  margin-bottom: 64px;
  transition: border-color 0.3s ease;
}
.video-wrap:hover { border-color: var(--coral); }
.video-wrap iframe {
  position: absolute;
  top: 0; left: 0;
  width: 100%;
  height: 100%;
  border: 0;
  border-radius: 14px;
}
.customer-slider {
  position: relative;
  padding: 0 8px;
}
.customer-slider .swiper-slide {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 6px;
}
.customer-slider .swiper-slide img {
  width: 100%;
  max-width: 340px;
  height: auto;
  border-radius: 12px;
  border: 1px solid #fff;
  background: rgba(255,255,255,0.02);
  transition: transform 0.5s cubic-bezier(0.4, 0.1, 0.3, 1), border-color 0.3s ease;
}
.customer-slider .swiper-slide img:hover {
  border-color: var(--coral);
  transform: scale(1.04);
}
.customer-slider .swiper-pagination {
  position: relative;
  margin-top: 32px;
}
.customer-slider .swiper-pagination-bullet {
  width: 8px;
  height: 8px;
  background: var(--paper-4);
  opacity: 1;
  margin: 0 6px !important;
  transition: background 0.3s, transform 0.3s;
}
.customer-slider .swiper-pagination-bullet-active {
  background: var(--coral);
  transform: scale(1.3);
}
.customer-slider .swiper-button-prev,
.customer-slider .swiper-button-next {
  color: var(--paper);
  width: 44px;
  height: 44px;
  margin-top: -22px;
  border: 1px solid var(--paper-3);
  border-radius: 999px;
  background: rgba(0,0,0,0.55);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  transition: background 0.3s, border-color 0.3s, transform 0.3s;
}
.customer-slider .swiper-button-prev:hover,
.customer-slider .swiper-button-next:hover {
  background: var(--paper);
  color: var(--ink);
  border-color: var(--paper);
  transform: scale(1.06);
}
.customer-slider .swiper-button-prev:after,
.customer-slider .swiper-button-next:after {
  font-size: 14px;
  font-weight: 700;
}

/* ============== Specifications (寸法表) ============== */
.specs {
  background: var(--ink);
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
}
.specs-note {
  font-family: var(--font-jp);
  font-size: 12px;
  color: var(--paper-3);
  letter-spacing: 0.06em;
  margin-top: 6px;
}
.table-scroller {
  width: 100%;
  overflow-x: auto;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: rgba(255,255,255,0.02);
  -webkit-overflow-scrolling: touch;
}
.dimensions-table {
  width: 100%;
  min-width: 1080px;
  border-collapse: collapse;
  color: var(--paper);
  font-family: var(--font-jp);
}
.dimensions-table thead th {
  background: #0a0a0a;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--paper-2);
  padding: 18px 14px;
  text-align: center;
  border-bottom: 1px solid var(--line);
  line-height: 1.45;
  white-space: nowrap;
}
.dimensions-table thead th .th-jp {
  display: block;
  font-family: var(--font-jp);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--paper-3);
  text-transform: none;
  margin-top: 4px;
}
.dimensions-table tbody th {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 14px;
  letter-spacing: 0.08em;
  color: var(--paper);
  text-align: center;
  padding: 18px 14px;
  border-bottom: 1px solid var(--line-soft);
  border-right: 1px solid var(--line);
  background: #050505;
  white-space: nowrap;
}
.dimensions-table thead th:first-child,
.dimensions-table tbody th {
  position: sticky;
  left: 0;
  z-index: 2;
}
.dimensions-table thead th:first-child {
  z-index: 3;
  box-shadow: 1px 0 0 var(--line);
}
.dimensions-table tbody th {
  box-shadow: 1px 0 0 var(--line-soft);
}
.dimensions-table tbody td {
  font-family: var(--font-jp);
  font-size: 14px;
  color: var(--paper-2);
  text-align: center;
  padding: 18px 14px;
  border-bottom: 1px solid var(--line-soft);
  line-height: 1.6;
}
.dimensions-table tbody tr:last-child th,
.dimensions-table tbody tr:last-child td {
  border-bottom: none;
}
.dimensions-table tbody tr:hover td {
  background: rgba(253,119,109,0.04);
}
.dimensions-table tbody tr:hover th {
  background: #160a09;
}
.cell-note {
  font-family: var(--font-jp);
  font-size: 13px;
  color: var(--paper-2);
  text-align: left;
  line-height: 1.7;
  max-width: 320px;
}
.amazon-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 9px 18px;
  background: #ff9900;
  color: #ffffff;
  font-family: var(--font-display);
  font-size: 11.5px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  line-height: 1;
  border-radius: 999px;
  transition: background 0.3s, transform 0.3s, box-shadow 0.3s;
  white-space: nowrap;
}
.amazon-btn:hover {
  background: #e88b00;
  transform: translateY(-1px);
  box-shadow: 0 6px 18px rgba(255,153,0,0.32);
}
.table-caption {
  margin-top: 22px;
  font-family: var(--font-jp);
  font-size: 13px;
  line-height: 1.85;
  color: var(--paper-3);
  text-align: center;
  letter-spacing: 0.04em;
}
.table-caption strong {
  font-family: var(--font-display);
  font-weight: 700;
  color: var(--paper);
  letter-spacing: 0.06em;
}

/* ============== Contact ============== */
.contact {
  background: var(--ink);
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
}
.contact-content {
  display: grid;
  grid-template-columns: 1fr 1.1fr;
  gap: 70px;
  max-width: 1000px;
  margin: 0 auto;
  align-items: start;
}
.contact-info h3 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 14px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  margin-bottom: 28px;
  color: var(--paper);
}
.contact-item {
  margin-bottom: 28px;
  padding-bottom: 28px;
  border-bottom: 1px solid var(--line-soft);
}
.contact-item:last-child { border-bottom: none; padding-bottom: 0; margin-bottom: 0; }
.contact-item strong {
  display: block;
  font-family: var(--font-display);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--paper-3);
  margin-bottom: 10px;
  font-weight: 600;
}
.contact-item .primary {
  font-family: var(--font-jp-serif);
  font-size: 17px;
  color: var(--paper);
  line-height: 1.7;
  letter-spacing: 0.02em;
}
.contact-item .secondary {
  font-family: var(--font-jp);
  font-size: 12px;
  color: var(--paper-3);
  margin-top: 4px;
  line-height: 1.7;
}

.contact-form { padding: 0; }
.form-group { margin-bottom: 28px; }
.form-group label {
  display: block;
  font-family: var(--font-jp);
  font-size: 14px;
  letter-spacing: 0.04em;
  color: var(--paper);
  margin-bottom: 12px;
  font-weight: 500;
}
.required-mark {
  font-family: var(--font-jp);
  font-size: 11px;
  color: var(--coral);
  margin-left: 6px;
  font-weight: 600;
}
.optional-mark {
  font-family: var(--font-jp);
  font-size: 11px;
  color: var(--paper-4);
  margin-left: 6px;
  font-weight: 500;
}
.form-group input[type="text"],
.form-group input[type="email"],
.form-group input[type="tel"],
.form-group textarea {
  width: 100%;
  padding: 14px 0;
  border: none;
  border-bottom: 1px solid rgba(255,255,255,0.25);
  background: transparent;
  color: var(--paper);
  font-family: var(--font-jp);
  font-size: 16px;
  transition: border-color 0.3s, border-width 0.3s;
}
.form-group input::placeholder,
.form-group textarea::placeholder {
  color: rgba(255,255,255,0.3);
}
.form-group textarea {
  min-height: 110px;
  resize: vertical;
}
.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-bottom: 2px solid var(--coral);
}
.form-group input[type="file"] {
  font-family: var(--font-jp);
  color: var(--paper-3);
  font-size: 13px;
  padding: 8px 0;
}
.form-group small {
  display: block;
  font-family: var(--font-jp);
  font-size: 11px;
  color: var(--paper-4);
  line-height: 1.7;
  margin-top: 8px;
}
.form-checkbox {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-jp);
  font-size: 13px;
  color: var(--paper-2);
  text-transform: none;
  letter-spacing: 0;
  margin: 0;
  font-weight: 400;
}
.form-checkbox input[type="checkbox"] {
  width: 14px; height: 14px;
  accent-color: var(--paper);
  flex-shrink: 0;
}
.form-checkbox a {
  border-bottom: 1px solid var(--paper-4);
  padding-bottom: 1px;
}
.form-checkbox .required-mark { margin-left: 4px; }
.submit-btn {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  margin-top: 22px;
  padding: 14px 32px;
  background: transparent;
  border: 1px solid var(--paper-3);
  color: var(--paper);
  font-family: var(--font-jp);
  font-weight: 600;
  font-size: 14px;
  letter-spacing: 0.18em;
  cursor: pointer;
  transition: all 0.3s ease;
  border-radius: 999px;
}
.submit-btn:hover {
  background: var(--paper);
  color: var(--ink);
  border-color: var(--paper);
}
.submit-btn .arrow {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 20px; height: 20px;
  border: 1px solid currentColor;
  border-radius: 50%;
  font-size: 11px;
  transition: transform 0.3s;
  letter-spacing: 0;
}
.submit-btn:hover .arrow { transform: translateX(2px); }

/* ============== Footer ============== */
.footer {
  background: var(--ink);
  border-top: 1px solid var(--line);
  padding: 70px 0 28px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr;
  gap: 50px;
  margin-bottom: 50px;
}
.footer-col h4 {
  font-family: var(--font-display);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--paper-3);
  margin-bottom: 18px;
}
.footer-brand {
  font-family: var(--font-jp-serif);
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--paper);
}
.footer-brand-en {
  font-family: var(--font-display);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--paper-3);
  margin-bottom: 18px;
}
.footer-address {
  font-family: var(--font-jp);
  font-size: 13px;
  color: var(--paper-2);
  line-height: 1.85;
}
.footer-nav { list-style: none; padding: 0; margin: 0; }
.footer-nav li { margin-bottom: 10px; }
.footer-nav a {
  font-family: var(--font-jp);
  font-size: 13px;
  color: var(--paper-2);
  transition: color 0.3s;
}
.footer-nav a:hover { color: var(--paper); }
.footer-bottom {
  border-top: 1px solid var(--line-soft);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font-display);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--paper-4);
}
.footer-bottom a {
  color: var(--paper-3);
  transition: color 0.3s;
}
.footer-bottom a:hover { color: var(--paper); }

/* ============== Quality & Trust ============== */
.quality {
  background: var(--ink);
  text-align: center;
  padding: 100px 0 130px;
}
.quality-message {
  font-family: var(--font-jp-serif);
  font-weight: 500;
  font-size: clamp(18px, 2vw, 24px);
  line-height: 1.9;
  letter-spacing: 0.08em;
  color: var(--paper);
  margin-bottom: 44px;
  max-width: 720px;
  margin-left: auto;
  margin-right: auto;
}
.quality-title {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(56px, 7.4vw, 110px);
  line-height: 1;
  letter-spacing: -0.005em;
  color: var(--paper);
  margin-bottom: 36px;
}
.quality-amp {
  font-family: var(--font-serif);
  font-style: italic;
  font-weight: 400;
  color: var(--coral);
  margin: 0 0.04em;
  font-size: 0.95em;
  vertical-align: -0.02em;
}
.quality-logo {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 14px;
  letter-spacing: 0.32em;
  text-transform: uppercase;
  color: var(--paper-2);
  margin-top: 28px;
}

/* ============== Body paragraphs ============== */
.body-paragraphs {
  max-width: 860px;
  margin: 0 auto;
}
.body-paragraphs p {
  font-family: var(--font-jp);
  font-size: 18px;
  line-height: 1.95;
  color: var(--paper-2);
  margin-bottom: 1.7em;
  letter-spacing: 0.02em;
}
.body-paragraphs p:last-child { margin-bottom: 0; }

/* ============== Products overlay ============== */
.products-overlay {
  position: fixed;
  inset: 0;
  z-index: 200;
  background: var(--ink);
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.45s ease, visibility 0.45s;
}
.products-overlay::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image: radial-gradient(circle at 1px 1px, rgba(255,255,255,0.06) 1px, transparent 0);
  background-size: 24px 24px;
  pointer-events: none;
}
.products-overlay.is-open {
  opacity: 1;
  visibility: visible;
}
body.products-locked { overflow: hidden; }

.products-overlay-header {
  position: sticky;
  top: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 40px;
  background: rgba(0,0,0,0.78);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line-soft);
  z-index: 2;
}
.products-overlay-close {
  width: 44px;
  height: 44px;
  border-radius: 999px;
  background: var(--paper);
  color: var(--ink);
  border: none;
  cursor: pointer;
  position: relative;
  transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  display: flex;
  align-items: center;
  justify-content: center;
}
.products-overlay-close:hover { transform: rotate(90deg); }
.products-overlay-close span {
  position: absolute;
  width: 16px;
  height: 1.6px;
  background: var(--ink);
  border-radius: 1px;
}
.products-overlay-close span:nth-child(1) { transform: rotate(45deg); }
.products-overlay-close span:nth-child(2) { transform: rotate(-45deg); }

.products-overlay-body {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: 1400px;
  margin: 0 auto;
  padding: 60px 40px 100px;
  flex: 1;
}
.products-overlay-eyebrow {
  display: flex;
  align-items: baseline;
  gap: 18px;
  margin-bottom: 48px;
  padding-bottom: 22px;
  border-bottom: 1px solid var(--line);
  opacity: 0;
  transform: translateY(12px);
}
.products-overlay.is-open .products-overlay-eyebrow {
  animation: po-fade 0.7s cubic-bezier(0.4, 0, 0.2, 1) 0.1s forwards;
}
@keyframes po-fade {
  to { opacity: 1; transform: translateY(0); }
}
.products-overlay-eyebrow .eb-en {
  font-family: var(--font-display);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--coral);
}
.products-overlay-eyebrow .eb-jp {
  font-family: var(--font-jp-serif);
  font-size: 14px;
  color: var(--paper-3);
  letter-spacing: 0.06em;
}
.products-overlay-eyebrow .eb-count {
  margin-left: auto;
  font-family: var(--font-display);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.2em;
  color: var(--paper-4);
}

.products-list {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  column-gap: 40px;
  margin: 0;
  padding: 0;
}
.products-list li {
  border-bottom: 1px solid var(--line);
  opacity: 0;
  transform: translateY(14px);
}
.products-overlay.is-open .products-list li {
  animation: po-fade 0.65s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}
.products-list .pl-link, .products-list .pl-current {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: baseline;
  gap: 22px;
  padding: 24px 4px;
  color: var(--paper);
  text-decoration: none;
  transition: color 0.3s ease, padding 0.3s ease, background 0.3s ease;
}
.products-list .pl-link:hover {
  color: var(--coral);
  padding-left: 14px;
}
.products-list .pl-num {
  font-family: var(--font-display);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.2em;
  color: var(--paper-4);
  min-width: 24px;
}
.products-list .pl-link:hover .pl-num { color: var(--coral); }
.products-list .pl-en {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(18px, 1.6vw, 24px);
  letter-spacing: -0.01em;
  line-height: 1.25;
}
.products-list .pl-jp {
  font-family: var(--font-jp-serif);
  font-size: 13px;
  color: var(--paper-3);
  letter-spacing: 0.04em;
  line-height: 1.5;
}
.products-list .pl-arrow {
  font-family: var(--font-display);
  font-size: 14px;
  color: var(--paper-4);
  transition: transform 0.3s ease, color 0.3s ease;
}
.products-list .pl-link:hover .pl-arrow {
  transform: translateX(6px);
  color: var(--coral);
}
.products-list .pl-current {
  color: var(--coral);
  cursor: default;
  background: linear-gradient(90deg, rgba(253,119,109,0.08), transparent 80%);
}
.products-list .pl-current .pl-num,
.products-list .pl-current .pl-jp {
  color: var(--coral);
}
.products-list .pl-now {
  font-family: var(--font-display);
  font-size: 9.5px;
  font-weight: 600;
  letter-spacing: 0.28em;
  color: var(--coral);
  text-transform: uppercase;
  border: 1px solid var(--coral);
  border-radius: 999px;
  padding: 4px 10px;
}

.mobile-br { display: none; }

/* ============== Responsive ============== */
@media (max-width: 768px) {
  body { padding-top: 50px; }
  .container, .container-wide { padding: 0 20px; }
  section.content { padding: 70px 0; }

  .site-header-inner { padding: 12px 20px; }
  .site-brand { font-size: 12px; letter-spacing: 0.18em; }
  .site-brand .brand-jp { display: none; }
  .site-nav { gap: 14px; font-size: 10.5px; letter-spacing: 0.1em; }
  .site-nav a[href$="#company"] { display: none; }
  .site-nav .nav-cta { padding: 6px 12px; font-size: 10px; }

  .hero { padding: 40px 0 16px; }
  .hero-title { font-size: clamp(30px, 7.8vw, 40px); line-height: 1; }
  .hero-jp { font-size: 13px; margin-bottom: 22px; letter-spacing: 0.04em; }
  .hero-image-wrap img { max-width: 78%; }

  .section-header { margin-bottom: 44px; }
  .section-header .wordmark { font-size: clamp(30px, 7.8vw, 40px); white-space: normal; line-height: 1.05; }
  .section-jp { font-size: 18px; letter-spacing: 0.02em; }

  .about-flange .about-jp-headline {
    font-size: clamp(22px, 6.2vw, 30px);
    line-height: 1.55;
    margin-bottom: 28px;
    letter-spacing: 0.02em;
  }

  .cases-grid { grid-template-columns: 1fr; gap: 40px; }
  .cases-grid--single { grid-template-columns: 1fr; }
  .case-image { height: 220px; }
  .case-eyebrow { font-size: 10px; letter-spacing: 0.22em; }
  .case-title { font-size: 16px; }
  .case-summary { font-size: 13px; }

  .voices-stage { max-width: 100%; }
  .video-wrap { margin-bottom: 44px; border-radius: 10px; }
  .video-wrap iframe { border-radius: 10px; }
  .customer-slider .swiper-slide img { max-width: 280px; }
  .customer-slider .swiper-button-prev,
  .customer-slider .swiper-button-next { display: none; }

  .dimensions-table thead th { font-size: 10.5px; padding: 14px 10px; letter-spacing: 0.1em; }
  .dimensions-table thead th .th-jp { font-size: 10px; }
  .dimensions-table tbody th { font-size: 12px; padding: 14px 10px; letter-spacing: 0.04em; }
  .dimensions-table tbody td { font-size: 12.5px; padding: 14px 10px; }
  .cell-note { font-size: 12px; max-width: none; }
  .amazon-btn { padding: 8px 14px; font-size: 10.5px; letter-spacing: 0.08em; }
  .table-caption { font-size: 12px; }

  .contact-content { grid-template-columns: 1fr; gap: 50px; }
  .contact-info h3 { font-size: 13px; }
  .form-group label { font-size: 13.5px; }
  .submit-btn { font-size: 13px; padding: 13px 28px; letter-spacing: 0.16em; }

  .footer { padding: 56px 0 24px; }
  .footer-grid { grid-template-columns: 1fr; gap: 36px; margin-bottom: 36px; }
  .footer-brand { font-size: 19px; }
  .footer-bottom { flex-direction: column; align-items: flex-start; gap: 10px; font-size: 10px; }

  .quality { padding: 90px 0 110px; }
  .quality-message { font-size: 15px; line-height: 1.95; margin-bottom: 40px; letter-spacing: 0.02em; padding: 0 6px; }
  .quality-title { font-size: clamp(48px, 16vw, 80px); margin-bottom: 24px; }
  .quality-logo { font-size: 12px; letter-spacing: 0.28em; margin-top: 22px; }

  .mobile-br { display: inline; }

  .body-paragraphs p {
    font-size: 14.5px;
    line-height: 1.85;
    margin-bottom: 1.4em;
    letter-spacing: 0.01em;
  }

  .products-overlay-header { padding: 14px 20px; }
  .products-overlay-close { width: 38px; height: 38px; }
  .products-overlay-close span { width: 14px; }
  .products-overlay-body { padding: 36px 20px 80px; }
  .products-overlay-eyebrow { gap: 12px; margin-bottom: 30px; padding-bottom: 16px; flex-wrap: wrap; }
  .products-overlay-eyebrow .eb-en { font-size: 10px; letter-spacing: 0.24em; }
  .products-overlay-eyebrow .eb-jp { font-size: 12px; }
  .products-overlay-eyebrow .eb-count { font-size: 10px; letter-spacing: 0.18em; }
  .products-list { grid-template-columns: 1fr; column-gap: 0; }
  .products-list .pl-link, .products-list .pl-current { gap: 16px; padding: 18px 4px; }
  .products-list .pl-link:hover { padding-left: 8px; }
  .products-list .pl-en { font-size: 17px; }
  .products-list .pl-jp { font-size: 12px; }
  .products-list .pl-arrow { font-size: 13px; }
  .products-list .pl-now { font-size: 9px; padding: 3px 8px; letter-spacing: 0.22em; }
}

@media (max-width: 360px) {
  .section-header .wordmark { font-size: 28px; }
  .hero-title { font-size: 28px; }
  .hero-jp { font-size: 12px; }
}