@charset "UTF-8";

/* =========================================================
   Reset (Eric Meyer v2.0 / public domain)
========================================================= */
html, body, div, span, applet, object, iframe,
h1, h2, h3, h4, h5, h6, p, blockquote, pre,
a, abbr, acronym, address, big, cite, code,
del, dfn, em, img, ins, kbd, q, s, samp,
small, strike, strong, sub, sup, tt, var,
b, u, i, center,
dl, dt, dd, ol, ul, li,
fieldset, form, label, legend,
table, caption, tbody, tfoot, thead, tr, th, td,
article, aside, canvas, details, embed,
figure, figcaption, footer, header, hgroup,
menu, nav, output, ruby, section, summary,
time, mark, audio, video {
  margin: 0;
  padding: 0;
  border: 0;
  font-size: 100%;
  font: inherit;
  vertical-align: baseline;
}
article, aside, details, figcaption, figure,
footer, header, hgroup, menu, nav, section { display: block; }
body { line-height: 1; }
ol, ul { list-style: none; }
blockquote, q { quotes: none; }
blockquote:before, blockquote:after,
q:before, q:after { content: ""; content: none; }
table { border-collapse: collapse; border-spacing: 0; }

*, *::before, *::after { box-sizing: border-box; }

/* =========================================================
   Design tokens
========================================================= */
:root {
  --wh-white: #ffffff;
  --wh-ivory: #fdfaf6;
  --wh-beige: #f5f0e8;
  --wh-gold: #d4af37;
  --wh-gold-soft: rgba(212, 175, 55, 0.2);
  --wh-navy: #1a2a3a;
  --wh-charcoal: #333333;
  --wh-gray-100: #f4f4f4;
  --wh-gray-300: #d0d0d0;
  --wh-gray-500: #888888;
  --wh-gray-600: #666666;
  --wh-gray-700: #4a4a4a;
  --wh-shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
  --wh-shadow-md: 0 6px 18px rgba(0, 0, 0, 0.06);
  --wh-shadow-xl: 0 18px 40px rgba(0, 0, 0, 0.08);
}

/* =========================================================
   Base
========================================================= */
body {
  font-family: "Noto Sans JP", "游ゴシック体", YuGothic, "Yu Gothic Medium", "Hiragino Sans", sans-serif;
  background-color: var(--wh-white);
  color: var(--wh-charcoal);
  font-size: 15px;
  line-height: 1.8;
  letter-spacing: 0.04em;
  overflow-x: hidden;
}
img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; transition: color .3s ease, opacity .3s ease, background-color .3s ease, border-color .3s ease; }
button { font-family: inherit; cursor: pointer; background: none; border: none; padding: 0; color: inherit; }
strong { font-weight: 700; }

.wh-serif {
  font-family: 'Playfair Display', "游明朝", "Yu Mincho", serif;
  font-weight: 600;
  letter-spacing: 0.05em;
}

.wh-container {
  width: 100%;
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 24px;
}

/* =========================================================
   Header
========================================================= */
#header-whitening {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 200;
  background-color: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}
.wh-header-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 16px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
}
.wh-logo-box {
  display: inline-flex;
  align-items: center;
}
.wh-logo-text { display: flex; flex-direction: column; line-height: 1.2; }
.wh-logo-text .wh-brand {
  font-family: 'Playfair Display', "游明朝", "Yu Mincho", serif;
  font-size: 18px;
  font-weight: 600;
  letter-spacing: 0.18em;
  color: var(--wh-navy);
}
.wh-logo-text .wh-sub {
  font-size: 10px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--wh-gray-500);
  margin-top: 4px;
}

.wh-contact-list {
  display: flex;
  align-items: center;
  gap: 28px;
  font-size: 13px;
  font-weight: 500;
  color: var(--wh-gray-700);
}
.wh-contact-list li a {
  position: relative;
  padding-bottom: 4px;
}
.wh-contact-list li a::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: 0;
  height: 1px;
  width: 0;
  background-color: var(--wh-gold);
  transition: width .3s ease;
}
.wh-contact-list li a:hover::after { width: 100%; }
.wh-contact-list li.wh-cta a {
  display: inline-block;
  background-color: var(--wh-navy);
  color: #fff;
  padding: 10px 22px;
  border-radius: 999px;
  font-size: 11px;
  letter-spacing: 0.22em;
}
.wh-contact-list li.wh-cta a::after { display: none; }
.wh-contact-list li.wh-cta a:hover { opacity: 0.85; }

.wh-header-menu-btn {
  display: none;
  width: 28px;
  height: 22px;
  position: relative;
  cursor: pointer;
}
.wh-header-menu-btn span {
  display: block;
  position: absolute;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: var(--wh-navy);
  transition: all .3s ease;
}
.wh-header-menu-btn span:nth-child(1) { top: 4px; }
.wh-header-menu-btn span:nth-child(2) { bottom: 4px; }

/* SP menu drawer */
.wh-menu-drawer {
  display: none;
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 100%;
  background-color: rgba(255, 255, 255, 0.98);
  z-index: 300;
  padding: 80px 24px 40px;
}
.wh-menu-drawer.is-open { display: block; }
.wh-menu-close-btn {
  position: absolute;
  top: 24px; right: 24px;
  width: 28px; height: 22px;
  cursor: pointer;
}
.wh-menu-close-btn span {
  display: block;
  position: absolute;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: var(--wh-navy);
  top: 50%;
}
.wh-menu-close-btn span:nth-child(1) { transform: rotate(45deg); }
.wh-menu-close-btn span:nth-child(2) { transform: rotate(-45deg); }
.wh-menu-list {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.wh-menu-list li a {
  display: block;
  padding: 16px 8px;
  border-bottom: 1px solid var(--wh-gray-100);
  font-size: 14px;
  color: var(--wh-navy);
  letter-spacing: 0.1em;
}

/* =========================================================
   Main wrapper
========================================================= */
#whitening {
  padding-top: 78px;
}

/* =========================================================
   Common section utilities
========================================================= */
.wh-section { padding: 96px 0; }
.wh-section--ivory { background-color: var(--wh-ivory); }
.wh-section--beige { background-color: rgba(245, 240, 232, 0.5); }
.wh-section--navy { background-color: var(--wh-navy); color: #fff; }
.wh-section-head { text-align: center; margin-bottom: 56px; }
.wh-section-head h2 {
  font-family: 'Playfair Display', "游明朝", "Yu Mincho", serif;
  font-size: 32px;
  font-weight: 600;
  margin-bottom: 16px;
  color: var(--wh-navy);
  letter-spacing: 0.06em;
}
.wh-section-head p {
  font-size: 13px;
  color: var(--wh-gray-500);
  line-height: 1.9;
}
.wh-divider {
  width: 48px;
  height: 2px;
  background-color: var(--wh-gold);
  margin: 0 auto;
}

/* =========================================================
   Hero
========================================================= */
.wh-hero {
  position: relative;
  background-color: var(--wh-ivory);
  padding: 96px 0 80px;
  overflow: hidden;
}
.wh-hero-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}
.wh-hero-badge {
  display: inline-block;
  padding: 6px 14px;
  background-color: #fff;
  border: 1px solid var(--wh-beige);
  font-size: 10px;
  letter-spacing: 0.22em;
  border-radius: 999px;
  color: var(--wh-gray-500);
  margin-bottom: 24px;
  text-transform: uppercase;
}
.wh-hero-title {
  font-family: 'Playfair Display', "游明朝", "Yu Mincho", serif;
  font-size: 46px;
  font-weight: 600;
  line-height: 1.35;
  margin-bottom: 24px;
  color: var(--wh-navy);
}
.wh-hero-title .wh-accent { color: var(--wh-gold); }
.wh-hero-lead {
  color: var(--wh-gray-600);
  line-height: 1.95;
  font-size: 14px;
  margin-bottom: 28px;
  max-width: 420px;
}
.wh-hero-points {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 40px;
}
.wh-hero-point {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  color: var(--wh-gray-600);
}
.wh-hero-point::before {
  content: '';
  width: 6px;
  height: 6px;
  background-color: var(--wh-gold);
  border-radius: 50%;
}
.wh-hero-buttons { display: flex; flex-wrap: wrap; gap: 14px; }
.wh-btn {
  display: inline-block;
  padding: 16px 32px;
  font-size: 12px;
  letter-spacing: 0.22em;
  border-radius: 2px;
  text-align: center;
  transition: all .3s ease;
  cursor: pointer;
  border: 1px solid transparent;
}
.wh-btn--primary {
  background-color: var(--wh-navy);
  color: #fff;
}
.wh-btn--primary:hover { opacity: 0.88; }
.wh-btn--ghost {
  background-color: #fff;
  border-color: var(--wh-gray-300);
  color: var(--wh-charcoal);
}
.wh-btn--ghost:hover { background-color: var(--wh-gray-100); }
.wh-btn--gold-outline {
  border-color: var(--wh-gold);
  color: var(--wh-gold);
  background-color: transparent;
}
.wh-btn--gold-outline:hover { background-color: var(--wh-gold); color: #fff; }
.wh-btn--invert {
  background-color: #fff;
  color: var(--wh-navy);
  font-weight: 700;
  padding: 20px 38px;
}
.wh-btn--invert:hover { background-color: var(--wh-gray-100); }
.wh-btn--invert-outline {
  background-color: transparent;
  color: #fff;
  border-color: rgba(255, 255, 255, 0.3);
  font-weight: 700;
  padding: 20px 38px;
}
.wh-btn--invert-outline:hover { background-color: rgba(255, 255, 255, 0.1); }

.wh-hero-figure {
  position: relative;
}
.wh-hero-figure-frame {
  aspect-ratio: 4 / 5;
  background-color: var(--wh-beige);
  border-radius: 999px 999px 0 0;
  overflow: hidden;
  border: 12px solid #fff;
  box-shadow: var(--wh-shadow-xl);
  position: relative;
}
.wh-hero-figure-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.wh-hero-figure-caption {
  position: absolute;
  bottom: -24px;
  left: -24px;
  background-color: #fff;
  padding: 22px 24px;
  box-shadow: var(--wh-shadow-xl);
  max-width: 220px;
}
.wh-hero-figure-caption .wh-caption-label {
  font-size: 10px;
  color: var(--wh-gray-500);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: 8px;
}
.wh-hero-figure-caption .wh-caption-body {
  font-size: 12px;
  color: var(--wh-gray-700);
  line-height: 1.7;
}

/* =========================================================
   Pain Points
========================================================= */
.wh-pain-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}
.wh-pain-card {
  padding: 36px 30px;
  background-color: var(--wh-ivory);
  border: 1px solid transparent;
  transition: border-color .3s ease, transform .3s ease;
}
.wh-pain-card:hover {
  border-color: var(--wh-gold-soft);
  transform: translateY(-3px);
}
.wh-pain-icon {
  font-size: 28px;
  margin-bottom: 18px;
  transition: transform .3s ease;
}
.wh-pain-card:hover .wh-pain-icon { transform: scale(1.1); }
.wh-pain-card h3 {
  font-weight: 500;
  font-size: 16px;
  color: var(--wh-navy);
  margin-bottom: 12px;
}
.wh-pain-card p {
  font-size: 12px;
  color: var(--wh-gray-600);
  line-height: 1.9;
}

/* =========================================================
   Comparison
========================================================= */
.wh-comparison-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}
.wh-comparison-body h2 {
  font-family: 'Playfair Display', "游明朝", "Yu Mincho", serif;
  font-size: 36px;
  line-height: 1.4;
  margin-bottom: 24px;
  color: var(--wh-navy);
}
.wh-comparison-body h2 .wh-accent { color: var(--wh-gold); }
.wh-comparison-body > p {
  font-size: 14px;
  color: var(--wh-gray-600);
  line-height: 1.95;
  margin-bottom: 30px;
}
.wh-feature-row {
  display: flex;
  gap: 16px;
  padding: 16px 20px;
  background-color: #fff;
  border-radius: 8px;
  box-shadow: var(--wh-shadow-sm);
  border-left: 4px solid var(--wh-gold);
  margin-bottom: 14px;
}
.wh-feature-check {
  color: var(--wh-gold);
  font-weight: 700;
  flex-shrink: 0;
  font-size: 14px;
  line-height: 1.6;
}
.wh-feature-title {
  font-size: 13px;
  font-weight: 700;
  color: var(--wh-navy);
  margin-bottom: 4px;
}
.wh-feature-desc {
  font-size: 11px;
  color: var(--wh-gray-500);
  line-height: 1.6;
}
.wh-chart-card {
  background-color: #fff;
  padding: 32px;
  border-radius: 16px;
  box-shadow: var(--wh-shadow-xl);
}
.wh-chart-card-head {
  text-align: center;
  margin-bottom: 24px;
}
.wh-chart-card-head h3 {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--wh-gray-500);
}
.wh-chart-container {
  position: relative;
  width: 100%;
  max-width: 600px;
  margin: 0 auto;
  height: 350px;
}
.wh-chart-note {
  font-size: 10px;
  color: var(--wh-gray-500);
  text-align: center;
  margin-top: 24px;
}

/* =========================================================
   Advantages (6 reasons)
========================================================= */
.wh-advantages-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 48px 32px;
}
.wh-advantage-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  background-color: var(--wh-beige);
  color: var(--wh-gold);
  border-radius: 50%;
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 16px;
  letter-spacing: 0.05em;
}
.wh-advantage h3 {
  font-weight: 700;
  font-size: 15px;
  color: var(--wh-navy);
  margin-bottom: 10px;
}
.wh-advantage p {
  font-size: 12px;
  color: var(--wh-gray-500);
  line-height: 1.9;
}

/* =========================================================
   Process / Stepper
========================================================= */
.wh-process-grid {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 64px;
}
.wh-process-intro h2 {
  font-family: 'Playfair Display', "游明朝", "Yu Mincho", serif;
  font-size: 32px;
  line-height: 1.4;
  margin-bottom: 24px;
  color: var(--wh-navy);
}
.wh-process-intro p {
  font-size: 14px;
  color: var(--wh-gray-600);
  line-height: 1.95;
  margin-bottom: 32px;
}
.wh-step-display {
  width: 100%;
  aspect-ratio: 1 / 1;
  background-color: #fff;
  border-radius: 18px;
  box-shadow: inset 0 0 0 1px var(--wh-gray-100);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  text-align: center;
}
.wh-step-display-content {
  transition: opacity .35s ease, transform .35s ease;
}
.wh-step-display-content.is-fading {
  opacity: 0;
  transform: scale(0.95);
}
.wh-step-icon {
  font-size: 52px;
  margin-bottom: 18px;
  opacity: 0.85;
}
.wh-step-title {
  font-family: 'Playfair Display', "游明朝", "Yu Mincho", serif;
  font-size: 20px;
  font-weight: 700;
  color: var(--wh-navy);
  margin-bottom: 8px;
}
.wh-step-desc {
  font-size: 11px;
  color: var(--wh-gray-500);
  line-height: 1.7;
}

.wh-step-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.wh-step-item {
  background-color: #fff;
  padding: 24px 28px;
  border-radius: 14px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: box-shadow .3s ease, border-color .3s ease;
}
.wh-step-item:hover { box-shadow: var(--wh-shadow-md); }
.wh-step-item.is-active {
  border-color: var(--wh-gold);
  box-shadow: var(--wh-shadow-md);
}
.wh-step-item-inner {
  display: flex;
  align-items: center;
  gap: 24px;
}
.wh-step-num {
  font-size: 24px;
  font-weight: 300;
  color: var(--wh-gray-300);
  transition: color .3s ease, font-weight .3s ease;
  font-family: 'Playfair Display', serif;
}
.wh-step-item.is-active .wh-step-num {
  color: var(--wh-gold);
  font-weight: 700;
}
.wh-step-item h4 {
  font-size: 14px;
  font-weight: 700;
  color: var(--wh-navy);
  margin-bottom: 4px;
}
.wh-step-item p {
  font-size: 12px;
  color: var(--wh-gray-500);
  line-height: 1.7;
}

/* =========================================================
   Utility
========================================================= */
/* SP（767px以下）でのみ改行させる <br> */
.wh-sp-br { display: none; }

/* =========================================================
   Pricing
========================================================= */
.wh-plan-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
  max-width: 960px;
  margin: 0 auto;
  align-items: stretch;
}
.wh-plan-card {
  position: relative;
  padding: 48px 40px;
  background-color: #fff;
  border: 2px solid var(--wh-beige);
  border-radius: 24px;
  text-align: center;
  transition: box-shadow .3s ease, transform .3s ease;
  display: flex;
  flex-direction: column;
}
.wh-plan-card:hover { box-shadow: var(--wh-shadow-md); }
.wh-plan-card--featured {
  border-color: var(--wh-gold);
  box-shadow: 0 18px 40px rgba(212, 175, 55, 0.18);
  background-color: #fffdf5;
}
.wh-plan-card--featured:hover {
  box-shadow: 0 22px 48px rgba(212, 175, 55, 0.22);
  transform: translateY(-3px);
}
.wh-plan-badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background-color: var(--wh-gold);
  color: #fff;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.18em;
  padding: 6px 18px;
  border-radius: 999px;
  white-space: nowrap;
}
.wh-plan-name {
  font-family: 'Playfair Display', "游明朝", "Yu Mincho", serif;
  font-size: 20px;
  color: var(--wh-gold);
  margin-bottom: 14px;
}
.wh-plan-card:not(.wh-plan-card--featured) .wh-plan-name {
  color: var(--wh-navy);
}
.wh-plan-price {
  font-size: 38px;
  font-weight: 700;
  color: var(--wh-navy);
  margin-bottom: 24px;
  letter-spacing: 0.02em;
  line-height: 1.2;
}
.wh-plan-price small {
  font-size: 14px;
  font-weight: 400;
  color: var(--wh-gray-500);
  margin-left: 4px;
}
.wh-plan-price-strike {
  display: block;
  font-size: 16px;
  font-weight: 400;
  color: var(--wh-gray-500);
  text-decoration: line-through;
  margin-bottom: 6px;
  letter-spacing: 0.04em;
}
.wh-plan-divider {
  width: 100%;
  height: 1px;
  background-color: var(--wh-gray-100);
  margin-bottom: 24px;
}
.wh-plan-features {
  text-align: left;
  margin-bottom: 36px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  flex-grow: 1;
}
.wh-plan-features li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  font-size: 12px;
  line-height: 1.8;
  color: var(--wh-gray-600);
}
.wh-plan-features li::before {
  content: '';
  width: 6px;
  height: 6px;
  margin-top: 7px;
  background-color: var(--wh-gold);
  border-radius: 50%;
  flex-shrink: 0;
}
.wh-plan-note {
  max-width: 960px;
  margin: 0 auto;
  padding-top: 40px;
  text-align: center;
  font-size: 12px;
  line-height: 2;
  color: var(--wh-gray-500);
}
.wh-plan-cta {
  width: 100%;
  background-color: var(--wh-navy);
  color: #fff;
  padding: 16px;
  font-size: 12px;
  letter-spacing: 0.22em;
  border-radius: 2px;
  transition: opacity .3s ease, background-color .3s ease, color .3s ease;
  display: inline-block;
  text-align: center;
  margin-top: auto;
}
.wh-plan-cta:hover { opacity: 0.88; }
.wh-plan-cta--ghost {
  background-color: transparent;
  color: var(--wh-navy);
  border: 1px solid var(--wh-navy);
}
.wh-plan-cta--ghost:hover {
  background-color: var(--wh-navy);
  color: #fff;
  opacity: 1;
}

.wh-monitor-card {
  margin-top: 72px;
  padding: 40px;
  background-color: var(--wh-ivory);
  border: 1px dashed rgba(212, 175, 55, 0.4);
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
}
.wh-monitor-card h4 {
  font-family: 'Playfair Display', "游明朝", "Yu Mincho", serif;
  font-size: 20px;
  margin-bottom: 8px;
  color: var(--wh-navy);
}
.wh-monitor-card p {
  font-size: 12px;
  color: var(--wh-gray-500);
  line-height: 1.85;
}

/* =========================================================
   FAQ
========================================================= */
.wh-faq-wrap {
  max-width: 760px;
  margin: 0 auto;
}
.wh-faq-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.wh-faq-item {
  background-color: #fff;
  border: 1px solid var(--wh-gray-100);
  border-radius: 10px;
  overflow: hidden;
}
.wh-faq-question {
  width: 100%;
  padding: 22px 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  text-align: left;
  transition: background-color .3s ease;
}
.wh-faq-question:hover { background-color: #fafafa; }
.wh-faq-question-text {
  font-size: 14px;
  font-weight: 700;
  color: var(--wh-navy);
}
.wh-faq-toggle {
  font-size: 20px;
  color: var(--wh-gold);
  font-weight: 300;
  flex-shrink: 0;
  line-height: 1;
}
.wh-faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height .35s ease;
  background-color: #fafafa;
}
.wh-faq-answer-inner {
  padding: 22px 28px;
  font-size: 12px;
  color: var(--wh-gray-600);
  line-height: 1.95;
  border-top: 1px solid var(--wh-gray-100);
}

/* =========================================================
   Contact CTA
========================================================= */
.wh-contact-cta {
  text-align: center;
}
.wh-contact-cta h2 {
  font-family: 'Playfair Display', "游明朝", "Yu Mincho", serif;
  font-size: 38px;
  line-height: 1.5;
  margin-bottom: 28px;
  color: #fff;
}
.wh-contact-cta p {
  color: rgba(255, 255, 255, 0.65);
  font-size: 12px;
  line-height: 1.95;
  margin-bottom: 48px;
  max-width: 520px;
  margin-left: auto;
  margin-right: auto;
}
.wh-contact-cta-buttons {
  display: flex;
  justify-content: center;
  gap: 20px;
  flex-wrap: wrap;
}
.wh-contact-cta-tel {
  margin-top: 40px;
  font-size: 12px;
  letter-spacing: 0.22em;
  color: rgba(255, 255, 255, 0.55);
}

/* =========================================================
   Footer
========================================================= */
#footer-whitening {
  background-color: #fff;
  border-top: 1px solid var(--wh-gray-100);
  padding: 56px 0;
}
.wh-footer-inner {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 48px;
}
.wh-footer-brand {
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.wh-footer-brand .wh-brand {
  font-family: 'Playfair Display', "游明朝", "Yu Mincho", serif;
  font-size: 22px;
  letter-spacing: 0.18em;
  color: var(--wh-navy);
}
.wh-footer-brand address {
  font-style: normal;
  font-size: 11px;
  color: var(--wh-gray-500);
  line-height: 1.85;
}
.wh-footer-meta {
  font-size: 10px;
  color: var(--wh-gray-500);
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.wh-footer-meta .wh-footer-links {
  margin-top: 12px;
  display: flex;
  gap: 18px;
}
.wh-footer-meta .wh-footer-links a:hover { color: var(--wh-gray-700); }
.wh-footer-copy {
  text-align: center;
  margin-top: 40px;
  font-size: 10px;
  color: var(--wh-gray-500);
  letter-spacing: 0.05em;
}

/* =========================================================
   Animations
========================================================= */
.wh-fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity .8s ease, transform .8s ease;
}
.wh-fade-in.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* =========================================================
   Responsive — Tablet
========================================================= */
@media (max-width: 1023px) {
  .wh-hero-title { font-size: 38px; }
  .wh-comparison-body h2 { font-size: 30px; }
  .wh-process-intro h2 { font-size: 26px; }
  .wh-section-head h2 { font-size: 28px; }
  .wh-contact-cta h2 { font-size: 30px; }
  .wh-advantages-grid { grid-template-columns: repeat(2, 1fr); }
}

/* =========================================================
   Responsive — Mobile
========================================================= */
@media (max-width: 767px) {
  body { font-size: 14px; line-height: 1.85; }

  .wh-sp-br { display: inline; }

  .wh-container { padding: 0 20px; }
  .wh-section { padding: 64px 0; }
  .wh-section-head { margin-bottom: 40px; }
  .wh-section-head h2 { font-size: 24px; }

  #header-whitening { background-color: rgba(255, 255, 255, 0.96); }
  .wh-header-inner { padding: 12px 18px; }
  .wh-logo-text .wh-brand { font-size: 16px; letter-spacing: 0.12em; }
  .wh-logo-text .wh-sub { font-size: 9px; }
  .wh-contact-list { display: none; }
  .wh-header-menu-btn { display: block; }

  #whitening { padding-top: 62px; }

  .wh-hero { padding: 56px 0 64px; }
  .wh-hero-grid {
    grid-template-columns: 1fr;
    gap: 48px;
  }
  .wh-hero-title { font-size: 30px; line-height: 1.4; }
  .wh-hero-lead { font-size: 13px; }
  .wh-hero-buttons .wh-btn { width: 100%; }
  .wh-hero-figure-caption {
    left: auto;
    right: 16px;
    bottom: -16px;
    padding: 16px 18px;
    max-width: 180px;
  }

  .wh-pain-grid { grid-template-columns: 1fr; gap: 16px; }
  .wh-pain-card { padding: 28px 24px; }

  .wh-comparison-grid { grid-template-columns: 1fr; gap: 40px; }
  .wh-comparison-body h2 { font-size: 24px; }
  .wh-chart-card { padding: 24px; }
  .wh-chart-container { height: 300px; }

  .wh-advantages-grid { grid-template-columns: 1fr; gap: 36px; }

  .wh-process-grid { grid-template-columns: 1fr; gap: 40px; }
  .wh-step-display { aspect-ratio: 16 / 10; }
  .wh-step-icon { font-size: 42px; margin-bottom: 12px; }
  .wh-step-title { font-size: 18px; }
  .wh-step-item { padding: 18px 22px; }
  .wh-step-item-inner { gap: 16px; }
  .wh-step-item p { display: none; }

  .wh-plan-grid { grid-template-columns: 1fr; gap: 36px; }
  .wh-plan-card { padding: 36px 28px; }
  .wh-plan-price { font-size: 32px; }

  .wh-monitor-card {
    flex-direction: column;
    align-items: stretch;
    text-align: center;
    padding: 32px 24px;
  }
  .wh-monitor-card .wh-btn { width: 100%; }

  .wh-faq-question { padding: 18px 20px; }
  .wh-faq-question-text { font-size: 13px; }
  .wh-faq-answer-inner { padding: 18px 20px; }

  .wh-contact-cta h2 { font-size: 24px; }
  .wh-contact-cta-buttons { flex-direction: column; align-items: stretch; }
  .wh-contact-cta-buttons .wh-btn { width: 100%; }

  #footer-whitening { padding: 40px 0; }
  .wh-footer-inner { flex-direction: column; gap: 28px; }
}