:root {
  --red: #c8102e;
  --black: #0c0c0c;
  --white: #fefefe;
  --cream: #f4f0eb;
  --ink: #1a1a1a;
  --ink-soft: #7a7570;
  --line: #d9d4ce;
  --line-dark: rgba(255, 255, 255, 0.12);
  --surface: #ffffff;
  --container: 1100px;
  --transition: 0.3s ease;
}

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: "Noto Sans JP", sans-serif;
  color: var(--ink);
  background: var(--white);
  line-height: 1.8;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

body.menu-open {
  overflow: hidden;
}

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

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

button,
input,
textarea {
  font: inherit;
}

button {
  border: none;
  background: none;
  cursor: pointer;
}

/* ==============================
   Container
   ============================== */

.container {
  width: min(calc(100% - 64px), var(--container));
  margin: 0 auto;
}

/* ==============================
   Sections
   ============================== */

.section {
  padding: 140px 0;
}

.section--dark {
  background: var(--black);
  color: var(--white);
}

.section--dark .section-title {
  color: var(--white);
}

.section--soft {
  background: var(--cream);
}

.section-head {
  display: grid;
  gap: 20px;
  margin-bottom: 64px;
  max-width: 720px;
}

.eyebrow {
  font-family: "Bodoni Moda", serif;
  font-size: 13px;
  font-weight: 400;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--red);
}

.eyebrow::before {
  content: none;
}

.section-title {
  font-family: "Noto Serif JP", serif;
  font-size: clamp(32px, 4.5vw, 52px);
  line-height: 1.3;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.section-copy {
  font-size: 16px;
  color: var(--ink-soft);
  max-width: 640px;
  line-height: 2;
}

.section--dark .section-copy {
  color: rgba(255, 255, 255, 0.55);
}

/* ==============================
   Header
   ============================== */

.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 1000;
  transition: background var(--transition), border-color var(--transition);
  border-bottom: 1px solid transparent;
}

.site-header.is-scrolled {
  background: rgba(12, 12, 12, 0.96);
  backdrop-filter: blur(12px);
  border-color: rgba(255, 255, 255, 0.08);
}

.header-inner {
  width: min(calc(100% - 64px), 1200px);
  margin: 0 auto;
  min-height: 80px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
}

/* ==============================
   Brand
   ============================== */

.brand {
  display: inline-flex;
  align-items: center;
  gap: 16px;
  flex-shrink: 0;
}

.brand-mark {
  width: 48px;
  height: 48px;
  background: transparent;
  border: none;
  padding: 0;
  border-radius: 0;
}

.brand-mark img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.site-header.is-scrolled .brand-mark {
  background: transparent;
  border: none;
  box-shadow: none;
}

.brand-text {
  display: grid;
  gap: 2px;
}

.brand-name {
  font-family: "Noto Serif JP", serif;
  font-size: 15px;
  font-weight: 700;
  color: var(--white);
  line-height: 1.3;
}

.brand-sub {
  font-family: "Bodoni Moda", serif;
  font-size: 11px;
  font-weight: 400;
  letter-spacing: 0.25em;
  color: rgba(255, 255, 255, 0.45);
  text-transform: uppercase;
}

/* ==============================
   Nav
   ============================== */

.site-nav {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav-link {
  font-family: "Bodoni Moda", serif;
  font-size: 13px;
  font-weight: 400;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.55);
  transition: color var(--transition);
}

.nav-link:hover,
.nav-link:focus-visible {
  color: var(--white);
}

/* ==============================
   Buttons
   ============================== */

.nav-cta,
.button-primary,
.button-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 32px;
  border-radius: 6px;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.06em;
  white-space: nowrap;
  transition: background var(--transition), border-color var(--transition), color var(--transition);
}

.nav-cta,
.button-primary {
  color: var(--white);
  background: var(--red);
  border: 1px solid var(--red);
}

.nav-cta,
.button-primary {
  position: relative;
  overflow: hidden;
}

.nav-cta::after,
.button-primary::after {
  content: "";
  position: absolute;
  top: 0;
  left: -100%;
  width: 60%;
  height: 100%;
  background: linear-gradient(
    90deg,
    transparent 0%,
    rgba(255, 255, 255, 0.35) 50%,
    transparent 100%
  );
  transition: none;
  pointer-events: none;
}

.nav-cta:hover::after,
.button-primary:hover::after,
.nav-cta:focus-visible::after,
.button-primary:focus-visible::after {
  animation: shimmer 0.6s ease forwards;
}

@keyframes shimmer {
  from { left: -100%; }
  to   { left: 120%; }
}

.button-secondary {
  color: var(--white);
  border: 1px solid rgba(255, 255, 255, 0.25);
  background: transparent;
}

.button-secondary:hover,
.button-secondary:focus-visible {
  border-color: var(--white);
  color: var(--white);
}

.button-secondary.is-light {
  color: var(--ink);
  border-color: var(--line);
  background: transparent;
}

.button-secondary.is-light:hover,
.button-secondary.is-light:focus-visible {
  border-color: var(--red);
  color: var(--red);
}

/* ==============================
   Menu Toggle
   ============================== */

.menu-toggle {
  display: none;
  width: 42px;
  height: 42px;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 6px;
}

.menu-toggle span {
  width: 22px;
  height: 1px;
  background: var(--white);
  transition: transform var(--transition), opacity var(--transition);
}

.menu-toggle.is-open span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.menu-toggle.is-open span:nth-child(2) {
  opacity: 0;
}

.menu-toggle.is-open span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ==============================
   Hero
   ============================== */

.hero {
  position: relative;
  overflow: hidden;
  padding: 180px 0 140px;
  background: var(--black);
  color: var(--white);
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(
    135deg,
    transparent,
    transparent 40px,
    rgba(255, 255, 255, 0.018) 40px,
    rgba(255, 255, 255, 0.018) 41px
  );
  pointer-events: none;
}

.hero::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--red);
  pointer-events: none;
}

.hero-inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 48px;
  align-items: center;
}

.hero-image {
  order: 2;
  max-width: 320px;
  transform: translateX(-150px);
}

.hero-image img {
  width: 100%;
  height: auto;
  display: block;
  opacity: 0.85;
}

.hero-copy {
  display: grid;
  gap: 36px;
  max-width: 800px;
}

.hero-label {
  font-family: "Bodoni Moda", serif;
  font-size: 13px;
  font-weight: 400;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.45);
  padding: 0;
  background: none;
  border: none;
  border-radius: 0;
}

.hero-title {
  font-family: "Noto Serif JP", serif;
  font-size: clamp(36px, 5.2vw, 64px);
  line-height: 1.3;
  letter-spacing: 0.02em;
  font-weight: 900;
}

.hero-title strong {
  color: var(--red);
  font-weight: inherit;
}

.hero-text {
  max-width: 620px;
  font-size: 16px;
  color: rgba(255, 255, 255, 0.55);
  line-height: 2;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

.hero-notes {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 28px;
  color: rgba(255, 255, 255, 0.35);
  font-size: 13px;
  letter-spacing: 0.04em;
}

.hero-notes span {
  display: inline-flex;
  align-items: center;
  gap: 12px;
}

.hero-notes span::before {
  content: "";
  width: 20px;
  height: 1px;
  background: var(--red);
  border-radius: 0;
  box-shadow: none;
}

/* ==============================
   Hero Support / Mission
   ============================== */

.hero-support {
  position: relative;
  padding: 100px 0 120px;
  margin-top: 0;
  background: var(--cream);
}

.hero-panel {
  position: relative;
  padding: 0;
  background: transparent;
  border: none;
  box-shadow: none;
  backdrop-filter: none;
  border-radius: 0;
  display: grid;
  gap: 28px;
}

.hero-panel::before {
  display: none;
}

.hero-panel--standalone {
  max-width: none;
  margin: 0 auto;
  padding: 0;
  background: transparent;
  border: none;
  box-shadow: none;
  backdrop-filter: none;
  border-radius: 0;
  color: var(--ink);
}

.hero-panel--standalone .panel-title {
  color: var(--ink) !important;
  text-shadow: none;
}

.hero-panel--standalone .panel-copy {
  color: var(--ink-soft);
}

.hero-panel--standalone .highlight-body strong {
  color: var(--ink);
}

.hero-panel--standalone .highlight-body span {
  color: var(--ink-soft);
}

.hero-panel--standalone .highlight-item {
  background: var(--surface);
  border: 1px solid var(--line);
  border-left: 3px solid var(--red);
  box-shadow: none;
  border-radius: 0;
}

.hero-panel--standalone .highlight-item::before {
  display: none;
}

.hero-panel--standalone::before {
  display: none;
}

.panel-label {
  font-family: "Bodoni Moda", serif;
  font-size: 13px;
  font-weight: 400;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--red);
  padding: 0;
  margin-top: 0;
  background: none;
  border: none;
  border-radius: 0;
  box-shadow: none;
}

.panel-title {
  font-family: "Noto Serif JP", serif;
  font-size: clamp(24px, 3vw, 32px);
  line-height: 1.5;
  font-weight: 700;
}

.panel-copy {
  font-size: 16px;
  color: var(--ink-soft);
  line-height: 2;
}

.hero-highlights {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 12px;
}

.highlight-item {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 16px;
  padding: 28px 24px;
  border-radius: 0;
  background: var(--surface);
  border: 1px solid var(--line);
  border-left: 3px solid var(--red);
  position: relative;
  overflow: hidden;
}

.highlight-number {
  font-family: "Noto Serif JP", serif;
  font-size: 22px;
  font-weight: 900;
  line-height: 1;
  color: var(--red);
}

.highlight-body strong {
  display: block;
  margin-bottom: 6px;
  font-size: 15px;
  font-weight: 700;
  color: var(--ink);
}

.highlight-body span {
  font-size: 14px;
  color: var(--ink-soft);
  line-height: 1.8;
}

/* ==============================
   Grids
   ============================== */

.issue-grid,
.strength-grid,
.scenario-grid,
.service-grid {
  display: grid;
  gap: 20px;
}

.issue-grid {
  grid-template-columns: repeat(3, 1fr);
}

/* ==============================
   Cards — shared base
   ============================== */

.issue-card,
.strength-card,
.scenario-card,
.service-card,
.flow-card,
.faq-item,
.company-card,
.contact-card,
.support-card {
  border-radius: 0;
  background: var(--surface);
  border: 1px solid var(--line);
  box-shadow: none;
}

/* ==============================
   Issue Cards
   ============================== */

.issue-card {
  padding: 36px 32px;
  display: grid;
  gap: 16px;
  border-left: 3px solid var(--red);
  position: relative;
  overflow: hidden;
}

.card-kicker {
  font-family: "Bodoni Moda", serif;
  font-size: 12px;
  font-weight: 400;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--red);
}

/* ==============================
   Titles — shared
   ============================== */

.issue-title,
.service-title,
.strength-title,
.scenario-title,
.flow-title,
.faq-question,
.company-title,
.contact-title {
  font-family: "Noto Serif JP", serif;
  font-size: 22px;
  line-height: 1.4;
  font-weight: 700;
  color: var(--ink);
}

/* ==============================
   Card body — shared
   ============================== */

.issue-card p,
.service-card p,
.strength-card p,
.scenario-card p,
.flow-card p,
.company-card p,
.contact-card p,
.support-card p {
  color: var(--ink-soft);
  font-size: 15px;
  line-height: 1.9;
}

/* ==============================
   Service
   ============================== */

.service-grid {
  grid-template-columns: repeat(2, 1fr);
  margin-bottom: 24px;
}

.service-card {
  padding: 40px 36px;
  display: grid;
  gap: 20px;
  position: relative;
  overflow: hidden;
}

.service-card::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 3px;
  background: var(--red);
}

.service-list {
  display: grid;
  gap: 10px;
  color: var(--ink-soft);
  font-size: 14px;
}

.service-list span {
  display: flex;
  gap: 12px;
  align-items: flex-start;
}

.service-list span::before {
  content: "";
  width: 16px;
  height: 1px;
  margin-top: 0.85em;
  flex-shrink: 0;
  background: var(--red);
  border-radius: 0;
}

/* ==============================
   Support Card
   ============================== */

.support-card {
  padding: 36px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  border-left: 3px solid var(--red);
}

.support-card strong {
  display: block;
  margin-bottom: 8px;
  font-family: "Noto Serif JP", serif;
  font-size: 18px;
  line-height: 1.5;
  color: var(--ink);
}

/* ==============================
   Strength
   ============================== */

.strength-grid {
  grid-template-columns: repeat(2, 1fr);
}

.strength-card {
  padding: 36px 32px;
  display: grid;
  gap: 16px;
  border-left: 3px solid var(--red);
  position: relative;
  overflow: hidden;
}

.strength-icon {
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  color: var(--red);
  background: none;
  border-radius: 0;
}

/* ==============================
   Domains
   ============================== */

.domain-layout {
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: 24px;
  align-items: stretch;
}

.domain-intro {
  padding: 40px 36px;
  border-radius: 0;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--line-dark);
  box-shadow: none;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 32px;
}

.domain-intro h3 {
  font-family: "Noto Serif JP", serif;
  font-size: 26px;
  line-height: 1.4;
  margin-bottom: 16px;
}

.domain-intro p {
  color: rgba(255, 255, 255, 0.55);
  font-size: 15px;
  line-height: 1.9;
}

.domain-intro-foot {
  display: grid;
  gap: 8px;
  padding: 20px 24px;
  border-radius: 0;
  border: 1px solid var(--line-dark);
  border-left: 3px solid var(--red);
  background: transparent;
}

.domain-intro-foot strong {
  font-size: 14px;
  color: var(--white);
}

.domain-intro-foot span {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.55);
}

.domain-groups {
  display: grid;
  gap: 16px;
}

.domain-group {
  padding: 28px;
  border-radius: 0;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--line-dark);
}

.domain-group h4 {
  font-family: "Noto Serif JP", serif;
  font-size: 16px;
  margin-bottom: 16px;
  color: var(--white);
}

.chip-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.chip {
  display: inline-flex;
  align-items: center;
  min-height: 36px;
  padding: 0 16px;
  border-radius: 0;
  border: 1px solid rgba(255, 255, 255, 0.12);
  background: transparent;
  color: rgba(255, 255, 255, 0.65);
  font-size: 13px;
  letter-spacing: 0.02em;
}

/* ==============================
   Card Hover Animation (shared)
   ============================== */

.issue-card::after,
.strength-card::after,
.scenario-card::after,
.service-card::after,
.case-card::after,
.highlight-item::after {
  content: "";
  position: absolute;
  top: -1px;
  left: -1px;
  width: 0;
  height: 2px;
  background: var(--red);
  transition: width 0.6s cubic-bezier(.25, 0, .25, 1);
  pointer-events: none;
}

.issue-card p::before,
.strength-card p::before,
.scenario-card p:last-of-type::before,
.service-card p::before,
.case-card .case-detail::before,
.highlight-body span::before {
  content: "";
  position: absolute;
  bottom: -1px;
  left: -1px;
  width: 0;
  height: 2px;
  background: var(--red);
  transition: width 0.6s cubic-bezier(.25, 0, .25, 1);
  pointer-events: none;
}

.issue-card p::after,
.strength-card p::after,
.scenario-card p:last-of-type::after,
.service-card p::after,
.case-card .case-detail::after,
.highlight-body span::after {
  content: "";
  position: absolute;
  top: -1px;
  right: -1px;
  width: 2px;
  height: 0;
  background: var(--red);
  transition: height 0.45s cubic-bezier(.25, 0, .25, 1) 0.55s;
  pointer-events: none;
}

.issue-card .issue-title::after,
.strength-card .strength-title::after,
.scenario-card .scenario-title::after,
.service-card .service-title::after,
.case-card .case-title::after,
.highlight-body strong::after {
  content: "";
  position: absolute;
  bottom: -1px;
  right: -1px;
  width: 2px;
  height: 0;
  background: var(--red);
  transition: height 0.45s cubic-bezier(.25, 0, .25, 1) 0.55s;
  pointer-events: none;
}

.issue-card:hover::after,
.strength-card:hover::after,
.scenario-card:hover::after,
.service-card:hover::after,
.case-card:hover::after,
.highlight-item:hover::after,
.issue-card:hover p::before,
.strength-card:hover p::before,
.scenario-card:hover p:last-of-type::before,
.service-card:hover p::before,
.case-card:hover .case-detail::before,
.highlight-item:hover .highlight-body span::before {
  width: calc(100% + 1px);
}

.issue-card:hover p::after,
.strength-card:hover p::after,
.scenario-card:hover p:last-of-type::after,
.service-card:hover p::after,
.case-card:hover .case-detail::after,
.highlight-item:hover .highlight-body span::after,
.issue-card:hover .issue-title::after,
.strength-card:hover .strength-title::after,
.scenario-card:hover .scenario-title::after,
.service-card:hover .service-title::after,
.case-card:hover .case-title::after,
.highlight-item:hover .highlight-body strong::after {
  height: calc(50% + 1px);
}

/* ==============================
   Case
   ============================== */

.case-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.case-card {
  border-radius: 0;
  background: var(--surface);
  border: 1px solid var(--line);
  border-left: 3px solid var(--red);
  padding: 40px 36px;
  display: grid;
  gap: 24px;
  box-shadow: none;
  position: relative;
  overflow: hidden;
}

.case-header {
  display: flex;
  align-items: center;
  gap: 12px;
}

.case-label {
  font-family: "Bodoni Moda", serif;
  font-size: 12px;
  font-weight: 400;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

.case-tag {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--red);
  border: 1px solid var(--red);
  padding: 4px 10px;
  border-radius: 4px;
}

.case-title {
  font-family: "Noto Serif JP", serif;
  font-size: 20px;
  line-height: 1.5;
  font-weight: 700;
  color: var(--ink);
}

.case-detail {
  display: grid;
  gap: 20px;
}

.case-detail > div {
  display: grid;
  grid-template-columns: 100px 1fr;
  gap: 16px;
}

.case-detail dt {
  font-family: "Bodoni Moda", serif;
  font-size: 12px;
  font-weight: 400;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--ink-soft);
  padding-top: 2px;
}

.case-detail dd {
  font-size: 15px;
  color: var(--ink-soft);
  line-height: 1.9;
}

/* ==============================
   Scenario
   ============================== */

.scenario-grid {
  grid-template-columns: repeat(3, 1fr);
  margin-bottom: 24px;
}

.scenario-card {
  padding: 36px 32px;
  display: grid;
  gap: 20px;
  border-left: 3px solid var(--red);
  position: relative;
  overflow: hidden;
}

.scenario-tag {
  font-family: "Bodoni Moda", serif;
  font-size: 12px;
  font-weight: 400;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--red);
  padding: 0;
  background: none;
  border-radius: 0;
}

.scenario-list {
  display: grid;
  gap: 8px;
  font-size: 14px;
  color: var(--ink-soft);
}

.scenario-list span {
  display: flex;
  gap: 12px;
}

.scenario-list span::before {
  content: "\2014";
  color: var(--red);
  font-weight: 400;
  flex-shrink: 0;
}

/* ==============================
   Flow
   ============================== */

.flow-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  counter-reset: step;
}

.flow-card {
  padding: 32px 36px;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 8px 24px;
  align-items: center;
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line);
  border-left: 3px solid var(--red);
}

/* 上辺ライン */
.flow-card::after {
  content: "";
  position: absolute;
  top: -1px;
  left: -1px;
  width: 0;
  height: 2px;
  background: var(--red);
  transition: width 0.6s cubic-bezier(.25, 0, .25, 1);
  pointer-events: none;
}

/* 下辺ライン */
.flow-card p::before {
  content: "";
  position: absolute;
  bottom: -1px;
  left: -1px;
  width: 0;
  height: 2px;
  background: var(--red);
  transition: width 0.6s cubic-bezier(.25, 0, .25, 1);
  pointer-events: none;
}

/* 右辺ライン（上から中心へ） */
.flow-card p::after {
  content: "";
  position: absolute;
  top: -1px;
  right: -1px;
  width: 2px;
  height: 0;
  background: var(--red);
  transition: height 0.45s cubic-bezier(.25, 0, .25, 1) 0.55s;
  pointer-events: none;
}

/* 右辺ライン（下から中心へ） */
.flow-card .flow-title::after {
  content: "";
  position: absolute;
  bottom: -1px;
  right: -1px;
  width: 2px;
  height: 0;
  background: var(--red);
  transition: height 0.45s cubic-bezier(.25, 0, .25, 1) 0.55s;
  pointer-events: none;
}

.flow-card:hover::after,
.flow-card:hover p::before {
  width: calc(100% + 1px);
}

.flow-card:hover p::after,
.flow-card:hover .flow-title::after {
  height: calc(50% + 1px);
}

.flow-card::before {
  counter-increment: step;
  content: "0" counter(step);
  font-family: "Bodoni Moda", serif;
  font-size: 32px;
  line-height: 1;
  color: var(--red);
  font-weight: 400;
  position: static;
  grid-row: 1 / 3;
}

.flow-title {
  position: static;
  font-size: 18px;
}

.flow-note {
  margin-top: 28px;
  font-size: 14px;
  color: var(--ink-soft);
}

/* ==============================
   FAQ
   ============================== */

.faq-list {
  display: grid;
  gap: 12px;
}

.faq-item {
  overflow: hidden;
  background: var(--surface);
  border: 1px solid var(--line);
}

.faq-button {
  width: 100%;
  padding: 28px 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  text-align: left;
}

.faq-question-wrap {
  display: flex;
  align-items: flex-start;
  gap: 16px;
}

.faq-prefix {
  font-family: "Bodoni Moda", serif;
  font-size: 24px;
  font-weight: 400;
  color: var(--red);
  line-height: 1;
}

.faq-question {
  font-size: 18px;
}

.faq-icon {
  width: 32px;
  height: 32px;
  border: 1px solid var(--line);
  border-radius: 0;
  background: transparent;
  color: var(--red);
  display: grid;
  place-items: center;
  font-size: 16px;
  flex-shrink: 0;
  transition: transform var(--transition), border-color var(--transition);
}

.faq-button[aria-expanded="true"] .faq-icon {
  transform: rotate(45deg);
  border-color: var(--red);
  background: transparent;
}

.faq-answer {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows var(--transition);
}

.faq-answer-inner {
  overflow: hidden;
}

.faq-answer-content {
  padding: 0 32px 28px 64px;
  color: var(--ink-soft);
  font-size: 15px;
  line-height: 2;
}

.faq-item.is-open .faq-answer {
  grid-template-rows: 1fr;
}

/* ==============================
   Company
   ============================== */

.company-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

.company-card,
.contact-card {
  padding: 44px 40px;
}

.company-title,
.contact-title {
  margin-bottom: 16px;
}

.company-list {
  display: grid;
  gap: 0;
  margin-top: 28px;
}

.company-row {
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 20px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
}

.company-row:first-child {
  border-top: 1px solid var(--line);
}

.company-row dt {
  font-family: "Bodoni Moda", serif;
  font-size: 12px;
  font-weight: 400;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

.company-row dd {
  font-size: 15px;
  color: var(--ink);
}

/* ==============================
   Contact Card
   ============================== */

.contact-card {
  background: var(--black);
  color: var(--white);
  border-color: rgba(255, 255, 255, 0.1);
  box-shadow: none;
}

.contact-card .contact-title {
  color: var(--white);
}

.contact-card p {
  color: rgba(255, 255, 255, 0.55);
}

.contact-form {
  margin-top: 28px;
  display: grid;
  gap: 16px;
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.field {
  display: grid;
  gap: 8px;
}

.field--full {
  grid-column: 1 / -1;
}

.field label {
  font-family: "Bodoni Moda", serif;
  font-size: 12px;
  font-weight: 400;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.45);
}

.field input,
.field textarea {
  width: 100%;
  border-radius: 0;
  border: 1px solid rgba(255, 255, 255, 0.12);
  background: rgba(255, 255, 255, 0.04);
  color: var(--white);
  padding: 14px 16px;
  outline: none;
  transition: border-color var(--transition);
}

.field input::placeholder,
.field textarea::placeholder {
  color: rgba(255, 255, 255, 0.25);
}

.field input:focus,
.field textarea:focus {
  border-color: var(--red);
}

.field textarea {
  min-height: 140px;
  resize: vertical;
}

.contact-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
  margin-top: 8px;
}

.contact-meta {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.35);
}

.form-status {
  display: none;
  margin-top: 8px;
  padding: 16px;
  border: 1px solid rgba(255, 255, 255, 0.1);
  background: rgba(255, 255, 255, 0.04);
  color: rgba(255, 255, 255, 0.65);
  font-size: 14px;
}

.form-status.is-visible {
  display: block;
}

/* ==============================
   Footer
   ============================== */

.site-footer {
  padding: 40px 0 48px;
  background: var(--black);
  color: rgba(255, 255, 255, 0.45);
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
}

.footer-copy {
  font-family: "Bodoni Moda", serif;
  font-size: 12px;
  letter-spacing: 0.1em;
}

.footer-links {
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
  font-family: "Bodoni Moda", serif;
  font-size: 12px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
}

.footer-links a {
  color: rgba(255, 255, 255, 0.35);
  transition: color var(--transition);
}

.footer-links a:hover,
.footer-links a:focus-visible {
  color: var(--white);
}

/* ==============================
   Reveal Animation
   ============================== */

.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

.reveal.is-visible {
  opacity: 1;
  transform: none;
}

/* ==============================
   Responsive — 1080px
   ============================== */

@media (max-width: 1080px) {
  .issue-grid,
  .strength-grid,
  .case-grid {
    grid-template-columns: 1fr;
  }

  .hero-inner,
  .domain-layout,
  .company-layout {
    grid-template-columns: 1fr;
  }

  .hero-image {
    display: none;
  }

  .hero-highlights {
    grid-template-columns: 1fr;
  }

  .scenario-grid {
    grid-template-columns: 1fr;
  }
}

/* ==============================
   Responsive — 900px
   ============================== */

@media (max-width: 900px) {
  .container,
  .header-inner {
    width: min(calc(100% - 40px), var(--container));
  }

  .site-nav {
    position: fixed;
    inset: 80px 16px auto;
    padding: 24px;
    background: rgba(12, 12, 12, 0.98);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 0;
    box-shadow: none;
    flex-direction: column;
    align-items: stretch;
    gap: 20px;
    transform: translateY(-16px);
    opacity: 0;
    pointer-events: none;
    transition: transform var(--transition), opacity var(--transition);
  }

  .site-nav.is-open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .nav-links {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }

  .nav-link {
    padding: 14px 0;
    color: rgba(255, 255, 255, 0.55);
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  }

  .nav-link:hover,
  .nav-link:focus-visible {
    color: var(--white);
  }

  .menu-toggle {
    display: inline-flex;
  }

  .site-header .nav-cta {
    width: 100%;
  }

  .hero {
    padding-top: 140px;
  }

  .hero-support {
    padding: 80px 0;
  }

  .section {
    padding: 100px 0;
  }

  .service-grid {
    grid-template-columns: 1fr;
  }

  .support-card,
  .contact-actions {
    flex-direction: column;
    align-items: flex-start;
  }
}

/* ==============================
   Responsive — 640px
   ============================== */

@media (max-width: 640px) {
  .hero-title {
    font-size: 36px;
  }

  .section-title {
    font-size: 28px;
  }

  .issue-grid,
  .strength-grid,
  .form-grid {
    grid-template-columns: 1fr;
  }

  .hero-actions {
    flex-direction: column;
  }

  .button-primary,
  .button-secondary {
    width: 100%;
  }

  .brand-mark {
    width: 40px;
    height: 40px;
  }

  .company-card,
  .contact-card,
  .service-card,
  .scenario-card,
  .issue-card,
  .strength-card,
  .flow-card,
  .support-card {
    padding: 28px 24px;
  }

  .company-row {
    grid-template-columns: 1fr;
    gap: 4px;
  }

  .faq-button {
    padding: 22px 20px;
  }

  .faq-answer-content {
    padding: 0 20px 22px 20px;
  }

  .message-layout {
    grid-template-columns: 1fr;
  }

  .message-photo {
    max-width: 320px;
  }

  .message-headline {
    font-size: 22px;
  }
}

/* ==============================
   Back to Top
   ============================== */

.back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  z-index: 900;
  width: 48px;
  height: 48px;
  display: grid;
  place-items: center;
  background: var(--black);
  border: 1px solid rgba(255, 255, 255, 0.15);
  color: var(--white);
  transition: border-color var(--transition), background var(--transition);
}

.back-to-top:hover,
.back-to-top:focus-visible {
  border-color: var(--red);
  background: var(--red);
}

/* ==============================
   TOP MESSAGE
   ============================== */

.message-layout {
  display: grid;
  grid-template-columns: 1fr 400px;
  gap: 64px;
  align-items: start;
}

.message-body {
  display: grid;
  gap: 32px;
}

.message-headline {
  font-family: "Noto Serif JP", serif;
  font-size: clamp(24px, 3vw, 30px);
  line-height: 1.5;
  font-weight: 700;
  color: var(--ink);
}

.message-text {
  display: grid;
  gap: 20px;
}

.message-text p {
  font-size: 15px;
  color: var(--ink-soft);
  line-height: 2;
}

.message-sign {
  display: grid;
  gap: 4px;
  margin-top: 8px;
}

.message-sign-company {
  font-size: 13px;
  color: var(--ink-soft);
  letter-spacing: 0.04em;
}

.message-sign-title {
  font-size: 13px;
  color: var(--ink-soft);
  letter-spacing: 0.04em;
}

.message-sign-name {
  font-family: "Noto Serif JP", serif;
  font-size: 24px;
  font-weight: 700;
  color: var(--ink);
  letter-spacing: 0.1em;
  margin-top: 4px;
}

.message-photo {
  position: relative;
}

.message-photo img {
  width: 100%;
  height: auto;
  display: block;
}

/* ==============================
   Responsive — Message 1080px
   ============================== */

@media (max-width: 1080px) {
  .message-layout {
    grid-template-columns: 1fr;
  }

  .message-photo {
    max-width: 360px;
  }
}

/* ==============================
   Responsive — Back to Top 640px
   ============================== */

@media (max-width: 640px) {
  .back-to-top {
    bottom: 20px;
    right: 20px;
    width: 44px;
    height: 44px;
  }
}