/*
 * SEIKOU 3rd Phase
 * Base implementation for the TOP page design.
 */

:root {
  --color-bg: #ffffff;
  --color-surface: #f5f4f1;
  --color-text: #111111;
  --color-muted: #6b6b68;
  --color-border: #d9d7d2;
  --color-strong-border: #bdbab3;
  --font-base: "Hiragino Kaku Gothic ProN", "Yu Gothic", "YuGothic", "Meiryo", sans-serif;
  --font-heading: "Helvetica Neue", Helvetica, Arial, sans-serif;
  --container: 1280px;
  --space-1: 0.5rem;
  --space-2: 1rem;
  --space-3: 1.5rem;
  --space-4: 2rem;
  --space-5: 3rem;
  --space-6: 4rem;
  --space-7: 6rem;
  --space-8: 8rem;
  --line: 1px solid var(--color-border);
  --line-strong: 1px solid var(--color-strong-border);
}

html {
  box-sizing: border-box;
  scroll-behavior: smooth;
}

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

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-base);
  line-height: 1.8;
  letter-spacing: 0.01em;
}

img {
  display: block;
  max-width: 100%;
  height: auto;
}

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

a:hover {
  text-decoration: none;
}

h1,
h2,
h3,
h4,
p {
  margin-top: 0;
}

.site-container {
  width: min(100% - 2rem, var(--container));
  margin-inline: auto;
}

.site-header,
.site-footer {
  border-bottom: var(--line);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(12px);
}

.header-inner,
.footer-inner {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-2) 0;
}

.site-logo,
.footer-brand {
  display: inline-flex;
  flex-direction: column;
  gap: 0.1rem;
}

.site-logo-mark,
.footer-brand .site-logo-mark {
  font-family: var(--font-heading);
  font-size: clamp(1.6rem, 2vw, 2.1rem);
  line-height: 1;
  letter-spacing: 0.14em;
}

.site-logo-sub,
.footer-brand .site-logo-sub {
  font-size: 0.82rem;
  color: var(--color-muted);
  letter-spacing: 0.08em;
}

.site-nav {
  justify-self: center;
}

.site-nav ul,
.footer-nav ul {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1.25rem 1.75rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.site-nav a,
.footer-nav a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 3rem;
  padding: 0 0.2rem;
  font-family: var(--font-heading);
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.site-nav li:last-child a,
.footer-nav li:last-child a {
  padding: 0 1.5rem;
  background: #111;
  color: #fff;
}

.site-nav a:hover,
.footer-nav a:hover {
  opacity: 0.7;
}

.site-nav .contact-link,
.footer-nav .contact-link {
  padding: 1rem 1.5rem;
  background: #111;
  color: #fff;
}

.site-nav .contact-link:hover,
.footer-nav .contact-link:hover {
  opacity: 0.9;
}

.site-content {
  overflow: clip;
}

.section {
  border-bottom: var(--line);
  padding: var(--space-6) 0;
}

.section-grid {
  display: grid;
  grid-template-columns: 10rem minmax(0, 1fr);
  gap: var(--space-4);
}

.section-index {
  padding-top: 0.35rem;
  border-right: var(--line);
}

.section-index-number {
  display: block;
  margin-bottom: var(--space-1);
  font-family: var(--font-heading);
  font-size: 1.45rem;
  letter-spacing: 0.08em;
}

.section-index-label {
  display: block;
  font-family: var(--font-heading);
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.section-content {
  min-width: 0;
}

.section-title {
  margin-bottom: var(--space-3);
  font-family: var(--font-heading);
  font-size: clamp(1.9rem, 2.4vw, 2.9rem);
  font-weight: 400;
  line-height: 1.1;
  letter-spacing: 0.03em;
}

.section-lead {
  max-width: 42rem;
  color: var(--color-text);
  font-size: 1rem;
}

.section-callout {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  margin-top: var(--space-4);
  padding: var(--space-3);
  border-top: var(--line);
  border-bottom: var(--line);
  background: #fafafa;
}

.eyebrow {
  margin-bottom: var(--space-2);
  font-family: var(--font-heading);
  font-size: 0.9rem;
  line-height: 1.35;
  letter-spacing: 0.16em;
}

.hero-title {
  margin-bottom: var(--space-2);
  font-family: var(--font-heading);
  font-size: clamp(4rem, 7vw, 7rem);
  line-height: 0.92;
  letter-spacing: -0.03em;
}

.hero-jp {
  margin-bottom: var(--space-2);
  font-size: clamp(1.15rem, 1.7vw, 1.7rem);
  letter-spacing: 0.04em;
}

.hero-lead {
  max-width: 36rem;
  margin-bottom: var(--space-4);
  color: var(--color-text);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 3rem;
  padding: 0.85rem 1.5rem;
  border: 1px solid var(--color-text);
  border-radius: 0;
  background: transparent;
  color: var(--color-text);
  font-family: var(--font-heading);
  font-size: 0.86rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.btn:hover {
  background: var(--color-text);
  color: #fff;
}

.btn-solid {
  background: var(--color-text);
  color: #fff;
}

.btn-solid:hover {
  background: #000;
}

.btn-ghost {
  border-color: var(--color-border);
  color: var(--color-text);
}

.btn-outline {
  min-width: 14rem;
}

.visual-placeholder {
  position: relative;
  overflow: hidden;
  border: var(--line);
  background:
    linear-gradient(135deg, rgba(0, 0, 0, 0.03), rgba(0, 0, 0, 0.08)),
    var(--color-surface);
}

.visual-placeholder::before,
.visual-placeholder::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.visual-placeholder::before {
  background: linear-gradient(145deg, rgba(255, 255, 255, 0.2), transparent 55%);
}

.visual-placeholder-label {
  position: absolute;
  inset: auto 1rem 1rem auto;
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  color: var(--color-muted);
  text-transform: uppercase;
}

.visual-placeholder-hero {
  min-height: 38rem;
}

.visual-placeholder-card {
  min-height: 12rem;
}

.visual-placeholder-portrait {
  min-height: 23rem;
}

.first-view-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr) 11rem;
  gap: var(--space-4);
  align-items: stretch;
}

.first-view-copy {
  padding-right: var(--space-2);
}

.first-view-visual {
  display: flex;
  align-items: stretch;
}

.first-view-visual .visual-placeholder {
  width: 100%;
}

.first-view-years {
  display: flex;
  align-items: center;
  justify-content: center;
  border-left: var(--line);
}

.years-block {
  display: grid;
  place-items: center;
  gap: 0.45rem;
  text-align: center;
}

.years-number,
.years-number-large {
  font-family: var(--font-heading);
  font-size: clamp(3.2rem, 5vw, 5.5rem);
  line-height: 0.9;
  letter-spacing: 0.03em;
}

.years-text span,
.years-text small {
  display: block;
  letter-spacing: 0.16em;
}

.years-text span {
  font-family: var(--font-heading);
  font-size: 1.1rem;
}

.years-text small {
  color: var(--color-muted);
  font-size: 0.75rem;
}

.problem-grid,
.services-grid,
.phase-grid,
.experience-grid,
.workflow-grid {
  display: grid;
  gap: var(--space-3);
}

.problem-grid {
  grid-template-columns: repeat(5, minmax(0, 1fr));
}

.problem-item,
.service-card,
.phase-card,
.experience-card,
.workflow-step {
  padding: var(--space-3);
  border: var(--line);
  background: #fff;
}

.problem-item {
  display: grid;
  gap: var(--space-2);
  align-content: start;
  min-height: 12rem;
}

.problem-icon {
  font-size: 1.4rem;
  line-height: 1;
}

.services-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.service-card {
  padding: 0;
  overflow: hidden;
}

.service-card-media {
  border: 0;
  border-bottom: var(--line);
}

.service-card-body {
  padding: var(--space-3);
}

.service-label,
.phase-kicker,
.profile-summary-title {
  margin-bottom: var(--space-2);
  font-family: var(--font-heading);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-muted);
}

.service-card h3,
.phase-card h3,
.experience-card h3,
.workflow-step h3 {
  margin-bottom: var(--space-1);
  font-family: var(--font-heading);
  font-size: 1.2rem;
  font-weight: 400;
  letter-spacing: 0.03em;
}

.service-card p,
.phase-card p,
.experience-card p,
.workflow-step p {
  margin-bottom: 0;
}

.why-grid {
  display: grid;
  grid-template-columns: 10rem minmax(0, 1.2fr) minmax(0, 1fr);
  gap: var(--space-4);
  align-items: start;
}

.why-year-block {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.why-copy,
.profile-summary {
  padding-top: 0.3rem;
}

.why-copy-right {
  padding-top: 0.45rem;
}

.strong-copy {
  font-family: var(--font-heading);
  font-size: 1.15rem;
}

.phase-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.phase-card {
  min-height: 14rem;
}

.section-heading-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  margin-bottom: var(--space-3);
}

.experience-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.experience-card {
  padding: 0;
  border: var(--line);
}

.experience-card h3 {
  padding: var(--space-2) var(--space-3) var(--space-3);
}

.workflow-grid {
  grid-template-columns: repeat(5, minmax(0, 1fr));
}

.workflow-step {
  display: grid;
  gap: var(--space-1);
  min-height: 13rem;
}

.workflow-step span {
  display: block;
  font-family: var(--font-heading);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  color: var(--color-muted);
}

.message-profile-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr) minmax(0, 1fr);
  gap: var(--space-3);
  align-items: start;
}

.message-copy,
.profile-summary {
  padding-top: 0.35rem;
}

.message-signature {
  margin-top: var(--space-3);
  font-family: var(--font-heading);
  letter-spacing: 0.08em;
}

.profile-table {
  margin: 0;
}

.profile-table div {
  display: grid;
  grid-template-columns: 7rem 1fr;
  gap: var(--space-2);
  padding: 0.85rem 0;
  border-top: var(--line);
}

.profile-table div:last-child {
  border-bottom: var(--line);
}

.profile-table dt,
.profile-table dd {
  margin: 0;
}

.profile-table dt {
  font-family: var(--font-heading);
  font-size: 0.76rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-muted);
}

.profile-table dd {
  line-height: 1.7;
}

.section-final-cta .section-content {
  display: grid;
  gap: var(--space-2);
}

.site-footer {
  border-top: var(--line);
  border-bottom: 0;
}

.footer-inner {
  padding: var(--space-3) 0;
}

.footer-nav {
  justify-self: end;
}

.page-contact-hero,
.section-contact-form {
  border-bottom: var(--line);
}

.contact-layout {
  display: grid;
  grid-template-columns: 10rem minmax(0, 1fr);
  gap: var(--space-4);
}

.contact-panel {
  padding: var(--space-4);
  border: var(--line);
  background: #fff;
}

.contact-intro {
  margin-bottom: var(--space-4);
}

.contact-form-title {
  margin-bottom: 0.35rem;
  font-family: var(--font-heading);
  font-size: clamp(1.35rem, 2vw, 1.8rem);
  font-weight: 400;
  letter-spacing: 0.04em;
}

.contact-required-note {
  margin-bottom: var(--space-3);
  color: var(--color-muted);
  font-size: 0.78rem;
}

.contact-required-note span,
.required-label,
.optional-label {
  display: inline-block;
  margin-left: 0.4rem;
  padding: 0.08rem 0.4rem;
  border: var(--line);
  color: var(--color-muted);
  font-size: 0.65rem;
  font-weight: 400;
  line-height: 1.4;
  letter-spacing: 0.06em;
  vertical-align: 0.1em;
}

.required-label,
.contact-required-note span {
  border-color: var(--color-text);
  color: var(--color-text);
}

.contact-form-errors {
  margin-bottom: var(--space-3);
  padding: 0.9rem 1rem;
  border-left: 3px solid var(--color-text);
  background: var(--color-surface);
}

.contact-form-errors p {
  margin-bottom: 0.25rem;
}

.contact-form-errors p:last-child {
  margin-bottom: 0;
}

.contact-form {
  border-top: var(--line-strong);
}

.contact-form-row {
  display: grid;
  grid-template-columns: minmax(10rem, 0.35fr) minmax(0, 1fr);
  gap: var(--space-3);
  padding: 1.25rem 0;
  border-bottom: var(--line);
}

.contact-form-row > label {
  padding-top: 0.75rem;
  font-weight: 600;
  line-height: 1.5;
}

.contact-control input,
.contact-control select,
.contact-control textarea {
  width: 100%;
  border: var(--line-strong);
  border-radius: 0;
  background: #fff;
  color: var(--color-text);
  font: inherit;
  line-height: 1.5;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.contact-control input,
.contact-control select {
  min-height: 3.25rem;
  padding: 0.65rem 0.8rem;
}

.contact-control textarea {
  min-height: 13rem;
  padding: 0.8rem;
  resize: vertical;
}

.contact-control input:focus,
.contact-control select:focus,
.contact-control textarea:focus {
  border-color: var(--color-text);
  box-shadow: 0 0 0 2px rgba(17, 17, 17, 0.1);
  outline: 0;
}

.contact-form-row.has-error .contact-control input,
.contact-form-row.has-error .contact-control select,
.contact-form-row.has-error .contact-control textarea {
  border-color: #6f3a3a;
}

.field-error,
.field-help {
  margin: 0.4rem 0 0;
  font-size: 0.78rem;
  line-height: 1.55;
}

.field-error {
  color: #6f3a3a;
}

.field-help {
  color: var(--color-muted);
}

.contact-privacy {
  padding: var(--space-3) 0;
  text-align: center;
}

.contact-privacy label {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  cursor: pointer;
}

.contact-privacy input {
  width: 1.15rem;
  height: 1.15rem;
  margin: 0;
  accent-color: var(--color-text);
}

.contact-privacy a {
  border-bottom: 1px solid currentColor;
}

.contact-privacy .field-error {
  text-align: center;
}

.contact-submit {
  display: flex;
  justify-content: center;
  padding-top: var(--space-2);
}

.contact-submit .btn {
  min-width: min(100%, 20rem);
  border: 1px solid var(--color-text);
  cursor: pointer;
}

.contact-honeypot {
  position: absolute !important;
  left: -10000px !important;
  width: 1px !important;
  height: 1px !important;
  overflow: hidden !important;
}

.contact-complete {
  max-width: 46rem;
  padding: var(--space-5) 0;
}

.contact-complete .section-lead {
  margin-bottom: var(--space-4);
}

.section-privacy-policy .page-article {
  max-width: 52rem;
  margin-inline: auto;
}

.section-privacy-policy .page-header {
  margin-bottom: var(--space-4);
  padding-bottom: var(--space-3);
  border-bottom: var(--line);
}

.section-privacy-policy .page-header .section-title {
  margin-bottom: 0;
}

.section-privacy-policy .page-content {
  line-height: 1.9;
}

.section-privacy-policy .page-content h2 {
  margin: var(--space-5) 0 var(--space-2);
  padding-bottom: 0.65rem;
  border-bottom: var(--line);
  font-family: var(--font-heading);
  font-size: clamp(1.2rem, 2vw, 1.55rem);
  font-weight: 400;
  line-height: 1.4;
  letter-spacing: 0.03em;
}

.section-privacy-policy .page-content p,
.section-privacy-policy .page-content ul {
  margin-bottom: var(--space-2);
}

.section-privacy-policy .page-content ul {
  padding-left: 1.4rem;
}

.section-privacy-policy .page-content li + li {
  margin-top: 0.35rem;
}

.section-privacy-policy .page-content a {
  border-bottom: 1px solid currentColor;
}

.section-privacy-policy .privacy-contact-block {
  margin-top: var(--space-2);
  padding: var(--space-3);
  border: var(--line);
  background: var(--color-surface);
}

.section-privacy-policy .privacy-contact-block p:last-child {
  margin-bottom: 0;
}

@media (max-width: 1160px) {
  .first-view-grid,
  .why-grid,
  .message-profile-grid,
  .contact-layout {
    grid-template-columns: 1fr;
  }

  .first-view-years {
    border-left: 0;
    border-top: var(--line);
    padding-top: var(--space-3);
  }

  .why-year-block {
    justify-content: flex-start;
  }
}

@media (max-width: 900px) {
  .section-grid {
    grid-template-columns: 1fr;
    gap: var(--space-3);
  }

  .section-index {
    padding-top: 0;
    border-right: 0;
    border-bottom: var(--line);
    padding-bottom: var(--space-2);
  }

  .problem-grid,
  .services-grid,
  .phase-grid,
  .experience-grid,
  .workflow-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .section-callout {
    flex-direction: column;
    align-items: flex-start;
  }

  .section-heading-row {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (max-width: 700px) {
  .header-inner,
  .footer-inner {
    grid-template-columns: 1fr;
    justify-items: start;
  }

  .site-nav,
  .footer-nav {
    justify-self: start;
    width: 100%;
  }

  .site-nav ul,
  .footer-nav ul {
    justify-content: flex-start;
    gap: 0.75rem 1rem;
  }

  .site-nav .contact-link,
  .footer-nav .contact-link {
    width: 100%;
    justify-content: center;
  }

  .problem-grid,
  .services-grid,
  .phase-grid,
  .experience-grid,
  .workflow-grid {
    grid-template-columns: 1fr;
  }

  .hero-title {
    font-size: clamp(3rem, 16vw, 4.5rem);
  }

  .visual-placeholder-hero {
    min-height: 24rem;
  }

  .visual-placeholder-portrait {
    min-height: 18rem;
  }

  .section {
    padding: var(--space-5) 0;
  }

  .section-title {
    font-size: clamp(1.7rem, 8vw, 2.4rem);
  }

  .profile-table div {
    grid-template-columns: 1fr;
    gap: 0.35rem;
  }
}

/* TOP page alignment with the SEIKOU 3rd Phase mockup. */
.header-inner {
  grid-template-columns: auto 1fr;
}

.site-nav {
  justify-self: end;
}

.site-nav a {
  flex-direction: column;
  min-width: 5.5rem;
  line-height: 1.3;
}

.site-nav a small {
  margin-top: 0.25rem;
  font-family: var(--font-base);
  font-size: 0.64rem;
  letter-spacing: 0.04em;
  text-transform: none;
}

.section-first-view {
  padding-top: var(--space-4);
}

.first-view-grid {
  grid-template-columns: minmax(17rem, 1.05fr) minmax(22rem, 1.2fr) 11rem;
  gap: var(--space-3);
}

.hero-title {
  white-space: nowrap;
}

.first-view-visual img,
.first-view-visual .visual-placeholder {
  width: 100%;
  min-height: 38rem;
  object-fit: cover;
}

.first-view-years {
  position: relative;
  padding-right: 2rem;
}

.first-view-vertical-brand {
  position: absolute;
  right: 0;
  bottom: 0;
  writing-mode: vertical-rl;
  font-family: var(--font-heading);
  font-size: 0.65rem;
  letter-spacing: 0.16em;
}

.problem-item,
.service-card,
.phase-card,
.experience-card,
.workflow-step {
  border-color: transparent;
}

.problem-item {
  justify-items: center;
  min-height: 10rem;
  padding: var(--space-2);
  text-align: center;
}

.problem-icon,
.workflow-icon {
  display: grid;
  width: 3.5rem;
  height: 3.5rem;
  place-items: center;
  border: var(--line);
  border-radius: 50%;
  color: var(--color-muted);
}

.problem-icon .demo-icon,
.workflow-icon .demo-icon {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.problem-icon span {
  font-family: var(--font-heading);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
}

.service-card-media {
  border-bottom: 0;
}

.service-card-media img,
.service-card-media .visual-placeholder {
  width: 100%;
  aspect-ratio: 4 / 2.6;
  min-height: 0;
  object-fit: cover;
}

.service-card-body {
  padding: var(--space-2) 0 0;
}

.section-action {
  display: flex;
  justify-content: center;
  margin-top: var(--space-4);
}

.why-grid {
  grid-template-columns: 9rem minmax(0, 1.25fr) minmax(16rem, 0.9fr);
  align-items: center;
}

.why-year-block {
  display: grid;
  justify-items: start;
}

.phase-grid {
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr) auto minmax(0, 1fr);
  align-items: center;
}

.phase-card {
  min-height: 0;
  padding: var(--space-2);
  text-align: center;
}

.phase-arrow,
.workflow-arrow {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  color: var(--color-muted);
}

.experience-grid {
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: var(--space-2);
}

.experience-card img,
.experience-card .visual-placeholder {
  display: block;
  width: 100%;
  min-height: 0;
  aspect-ratio: 4 / 2.7;
  object-fit: cover;
}

.experience-card h3 {
  padding: var(--space-1) 0 0;
  font-size: 0.88rem;
}

.workflow-grid {
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr) auto minmax(0, 1fr) auto minmax(0, 1fr) auto minmax(0, 1fr);
  align-items: center;
  gap: var(--space-2);
}

.workflow-step {
  justify-items: center;
  min-height: 0;
  padding: var(--space-2) 0;
  text-align: center;
}

.workflow-icon {
  margin-bottom: var(--space-1);
}

.message-grid {
  display: grid;
  grid-template-columns: minmax(13rem, 0.7fr) minmax(0, 1.6fr);
  gap: var(--space-5);
  align-items: start;
}

.message-photo img {
  width: 100%;
  aspect-ratio: 3 / 4;
  object-fit: cover;
}

.message-heading {
  margin-bottom: var(--space-3);
  font-family: var(--font-heading);
  font-size: 1.2rem;
  font-weight: 400;
}

.company-profile-table {
  max-width: 52rem;
}

.company-profile-table dd:empty::after {
  content: "未設定";
  color: var(--color-muted);
}

.section-final-cta {
  padding: var(--space-3) 0;
}

.section-final-cta .section-grid {
  align-items: center;
}

.section-final-cta .section-index {
  padding-top: 0;
}

.section-final-cta .section-content {
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: var(--space-4);
}

.contact-cta-copy .section-title,
.contact-cta-copy .section-lead {
  margin-bottom: 0;
}

.footer-inner {
  grid-template-columns: minmax(12rem, 1fr) minmax(15rem, 1.4fr) minmax(14rem, 1fr) auto;
  align-items: start;
  padding: var(--space-4) 0;
}

.footer-identity small,
.footer-social-unset {
  display: block;
  margin-top: var(--space-2);
  color: var(--color-muted);
  font-size: 0.68rem;
}

.footer-nav,
.footer-legal-nav {
  justify-self: start;
}

.footer-nav ul,
.footer-legal-nav ul {
  display: grid;
  gap: 0.35rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.footer-nav a,
.footer-legal-nav a {
  min-height: 0;
  padding: 0;
  background: transparent !important;
  color: var(--color-text) !important;
  font-family: var(--font-base);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  text-transform: none;
}

.footer-main-nav li,
.footer-main-nav .contact-link {
  margin-left: 0;
  padding: 0;
  background: transparent !important;
  color: var(--color-text) !important;
  text-align: left;
}

.footer-main-nav a,
.footer-main-nav a.contact-link,
.footer-main-nav li:last-child a,
.footer-main-nav .contact-link > a {
  justify-content: flex-start;
  margin-left: 0;
  padding: 0;
  background: transparent !important;
  color: var(--color-text) !important;
}

.footer-social {
  white-space: nowrap;
}

@media (max-width: 1160px) {
  .first-view-grid {
    grid-template-columns: minmax(16rem, 0.9fr) minmax(20rem, 1.1fr);
  }

  .first-view-years {
    grid-column: 1 / -1;
    min-height: 9rem;
    border-top: var(--line);
  }

  .experience-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .footer-inner {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 900px) {
  .header-inner {
    grid-template-columns: 1fr;
  }

  .site-nav {
    justify-self: stretch;
  }

  .site-nav ul {
    justify-content: flex-start;
  }

  .site-nav a {
    min-width: auto;
  }

  .why-grid {
    grid-template-columns: 9rem minmax(0, 1fr);
  }

  .why-copy-right {
    grid-column: 2;
  }

  .phase-grid,
  .workflow-grid {
    grid-template-columns: 1fr;
  }

  .phase-arrow,
  .workflow-arrow {
    justify-self: center;
    transform: rotate(90deg);
  }

  .experience-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .message-grid {
    grid-template-columns: minmax(12rem, 0.7fr) minmax(0, 1.3fr);
    gap: var(--space-3);
  }
}

@media (max-width: 700px) {
  .first-view-grid,
  .why-grid,
  .message-grid,
  .footer-inner {
    grid-template-columns: 1fr;
  }

  .first-view-visual {
    grid-row: 2;
  }

  .first-view-years,
  .why-copy-right {
    grid-column: 1;
  }

  .hero-title {
    white-space: normal;
  }

  .first-view-visual img,
  .first-view-visual .visual-placeholder {
    min-height: 24rem;
  }

  .problem-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .services-grid,
  .experience-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .section-final-cta .section-content {
    grid-template-columns: 1fr;
  }

  .section-final-cta .btn {
    width: 100%;
  }

  .contact-panel {
    padding: var(--space-3) var(--space-2);
  }

  .contact-form-row {
    grid-template-columns: 1fr;
    gap: 0.55rem;
    padding: var(--space-2) 0;
  }

  .contact-form-row > label {
    padding-top: 0;
  }

  .contact-control input,
  .contact-control select {
    min-height: 3.5rem;
  }

  .contact-privacy label {
    align-items: flex-start;
    text-align: left;
  }

  .contact-submit .btn {
    width: 100%;
  }

  .section-privacy-policy .page-header {
    margin-bottom: var(--space-3);
  }

  .section-privacy-policy .page-content h2 {
    margin-top: var(--space-4);
  }

  .section-privacy-policy .privacy-contact-block {
    padding: var(--space-2);
  }
}

@media (max-width: 420px) {
  .problem-grid,
  .services-grid,
  .experience-grid {
    grid-template-columns: 1fr;
  }
}

/* Final compact alignment for the desktop mockup. */
@media (min-width: 901px) {
  .header-inner {
    gap: 1.1rem;
    padding: 0.6rem 0;
  }

  .site-logo-mark {
    font-size: clamp(1.45rem, 1.8vw, 1.9rem);
  }

  .site-logo-sub {
    font-size: 0.74rem;
    line-height: 1.2;
  }

  .site-nav ul {
    gap: 0.6rem 1rem;
  }

  .site-nav a {
    min-width: 5rem;
    min-height: 2.5rem;
    padding-inline: 0.1rem;
    line-height: 1.15;
  }

  .site-nav a small {
    margin-top: 0.15rem;
    line-height: 1.2;
  }

  .site-nav .contact-link {
    min-height: 2.7rem;
    padding: 0.55rem 1.15rem;
  }

  .section:not(.section-first-view):not(.section-final-cta) {
    padding-block: 3.25rem;
  }

  .section-title {
    margin-bottom: 1.2rem;
    font-size: clamp(1.8rem, 2.15vw, 2.65rem);
  }

  .section-first-view {
    padding-block: 1.75rem 2.75rem;
  }

  .first-view-grid {
    align-items: stretch;
    gap: 1.25rem;
  }

  .first-view-copy {
    display: flex;
    flex-direction: column;
    justify-content: center;
  }

  .first-view-visual img,
  .first-view-visual .visual-placeholder {
    height: 34rem;
    min-height: 34rem;
  }

  .first-view-years {
    align-items: center;
  }

  .section-problem .section-title,
  .section-what-we-do .section-title,
  .section-why-seikou .section-title,
  .section-third-phase .section-title,
  .section-how-we-work .section-title {
    margin-bottom: 1.35rem;
  }

  .problem-grid {
    gap: 1.1rem;
  }

  .problem-item {
    align-content: start;
    gap: 0.75rem;
    min-height: 9rem;
    padding: 0.75rem;
  }

  .section-problem .section-callout,
  .section-how-we-work .section-callout {
    margin-top: 1.5rem;
  }

  .services-grid {
    gap: 1.15rem;
  }

  .service-card-media img,
  .service-card-media .visual-placeholder {
    aspect-ratio: 4 / 2.35;
  }

  .service-card-body {
    padding-top: 0.65rem;
  }

  .service-label {
    margin-bottom: 0.25rem;
  }

  .service-card h3 {
    margin-bottom: 0.3rem;
  }

  .service-card p {
    line-height: 1.65;
  }

  .why-grid {
    grid-template-columns: 8.5rem minmax(0, 1.2fr) minmax(15rem, 0.85fr);
    gap: 1.75rem;
    align-items: center;
  }

  .phase-grid {
    gap: 1.25rem;
  }

  .phase-card {
    padding: 0.75rem 1rem;
  }

  .section-heading-row {
    align-items: center;
    margin-bottom: 1.25rem;
  }

  .section-heading-row .section-title {
    margin-bottom: 0;
  }

  .experience-grid {
    gap: 0.85rem;
  }

  .experience-card img,
  .experience-card .visual-placeholder {
    aspect-ratio: 4 / 2.9;
  }

  .experience-card h3 {
    margin-bottom: 0;
    padding-top: 0.45rem;
    line-height: 1.45;
  }

  .experience-card p {
    margin-top: 0.25rem;
    line-height: 1.55;
  }

  .workflow-grid {
    gap: 0.75rem;
  }

  .workflow-step {
    align-content: start;
    gap: 0.25rem;
    padding-block: 0.5rem;
  }

  .workflow-icon {
    margin-bottom: 0.35rem;
  }

  .workflow-step h3 {
    margin-bottom: 0.15rem;
  }

  .workflow-arrow {
    align-self: center;
    line-height: 1;
  }

  .section-message-profile {
    padding-bottom: 2.5rem !important;
    border-bottom: 0;
  }

  .section-message-profile .section-title {
    margin-bottom: 1.35rem;
  }

  .message-grid {
    grid-template-columns: minmax(13rem, 17rem) minmax(0, 1fr);
    gap: 2.25rem;
    align-items: start;
  }

  .message-photo img,
  .message-photo .visual-placeholder {
    width: 100%;
    min-height: 0;
    aspect-ratio: 3 / 4;
    object-fit: cover;
  }

  .message-copy {
    max-width: 46rem;
    padding-top: 0.1rem;
  }

  .message-heading {
    margin-bottom: 1rem;
  }

  .message-copy p {
    margin-bottom: 0.85rem;
    line-height: 1.75;
  }

  .message-signature {
    margin-top: 1.25rem;
  }

  .section-profile {
    padding-top: 2.5rem !important;
  }

  .section-profile .section-title {
    margin-bottom: 1.25rem;
  }

  .company-profile-table {
    max-width: 58rem;
  }

  .profile-table div {
    grid-template-columns: 8.5rem minmax(0, 1fr);
    gap: 1.25rem;
    padding-block: 0.65rem;
  }

  .profile-table dd {
    line-height: 1.55;
  }

  .section-final-cta {
    padding-block: 1.25rem;
  }

  .section-final-cta .section-grid,
  .section-final-cta .section-content {
    align-items: center;
  }

  .section-final-cta .section-grid {
    grid-template-columns: 10rem minmax(0, 1fr) minmax(13.75rem, 15rem);
    gap: var(--space-4);
  }

  .section-final-cta .section-content {
    display: contents;
  }

  .section-final-cta .contact-cta-copy {
    grid-column: 2;
  }

  .section-final-cta .btn {
    grid-column: 3;
    justify-self: center;
    min-height: 2.9rem;
    padding-block: 0.65rem;
    margin-right: 0;
  }

  .footer-inner {
    align-items: start;
    gap: 1.25rem;
    padding-block: 1.5rem;
  }

  .footer-identity small,
  .footer-social-unset {
    margin-top: 0.65rem;
  }

  .footer-nav ul,
  .footer-legal-nav ul {
    gap: 0.2rem;
  }
}

.menu-toggle {
  display: none;
}

/* Smartphone-only final alignment. */
@media (max-width: 700px) {
  .site-container {
    width: min(100% - 1.5rem, var(--container));
  }

  .header-inner {
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 0.75rem;
    padding-block: 0.65rem;
  }

  .site-logo {
    min-width: 0;
  }

  .site-logo-mark {
    font-size: 1.45rem;
  }

  .site-logo-sub {
    overflow: hidden;
    font-size: 0.68rem;
    line-height: 1.2;
    text-overflow: ellipsis;
    white-space: nowrap;
  }

  .menu-toggle {
    display: none;
    min-width: 4.25rem;
    min-height: 2.75rem;
    align-items: center;
    justify-content: center;
    gap: 0.55rem;
    padding: 0.55rem 0.7rem;
    border: var(--line-strong);
    border-radius: 0;
    background: #fff;
    color: var(--color-text);
    font-family: var(--font-heading);
    font-size: 0.72rem;
    letter-spacing: 0.1em;
    cursor: pointer;
  }

  .mobile-nav-ready .menu-toggle {
    display: inline-flex;
  }

  .menu-toggle-icon,
  .menu-toggle-icon::before,
  .menu-toggle-icon::after {
    display: block;
    width: 1rem;
    height: 1px;
    background: currentColor;
    transition: transform 0.18s ease;
  }

  .menu-toggle-icon {
    position: relative;
  }

  .menu-toggle-icon::before,
  .menu-toggle-icon::after {
    position: absolute;
    left: 0;
    content: "";
  }

  .menu-toggle-icon::before {
    top: -0.3rem;
  }

  .menu-toggle-icon::after {
    top: 0.3rem;
  }

  .is-menu-open .menu-toggle-icon {
    background: transparent;
  }

  .is-menu-open .menu-toggle-icon::before {
    top: 0;
    transform: rotate(45deg);
  }

  .is-menu-open .menu-toggle-icon::after {
    top: 0;
    transform: rotate(-45deg);
  }

  .header-inner .site-nav {
    grid-column: 1 / -1;
    justify-self: stretch;
    width: 100%;
    padding-top: 0.25rem;
    border-top: var(--line);
  }

  .mobile-nav-ready .site-nav {
    display: none;
  }

  .mobile-nav-ready.is-menu-open .site-nav {
    display: block;
  }

  .site-nav ul,
  .site-nav .menu {
    display: grid;
    grid-template-columns: 1fr;
    gap: 0;
    width: 100%;
  }

  .site-nav li {
    width: 100%;
    border-bottom: var(--line);
  }

  .site-nav a,
  .site-nav .contact-link,
  .site-nav li:last-child a {
    width: 100%;
    min-width: 0;
    min-height: 2.75rem;
    flex-direction: row;
    justify-content: space-between;
    padding: 0.65rem 0.2rem;
    background: transparent;
    color: var(--color-text);
    line-height: 1.25;
  }

  .site-nav a small {
    margin-top: 0;
    color: var(--color-muted);
  }

  .section {
    padding-block: 2.75rem;
  }

  .section-grid,
  .section-content,
  .first-view-copy,
  .message-copy,
  .contact-control {
    min-width: 0;
  }

  .section-grid {
    gap: 1.25rem;
  }

  .section-title {
    overflow-wrap: anywhere;
  }

  .section-first-view {
    padding-block: 2rem 2.75rem;
  }

  .first-view-grid {
    gap: 1.5rem;
  }

  .hero-title {
    font-size: clamp(2.9rem, 14vw, 3.8rem);
    line-height: 0.92;
    white-space: normal;
  }

  .hero-lead {
    margin-bottom: 1.5rem;
  }

  .first-view-copy .btn {
    width: 100%;
    min-width: 0;
    min-height: 3rem;
  }

  .first-view-visual {
    grid-row: auto;
    width: 100%;
  }

  .first-view-visual img,
  .first-view-visual .visual-placeholder {
    width: 100%;
    height: auto;
    min-height: 0;
    aspect-ratio: 4 / 3;
    object-fit: cover;
  }

  .first-view-years {
    grid-column: 1;
    min-height: 0;
    padding: 1.25rem 0 0;
    border-top: var(--line);
    border-left: 0;
  }

  .years-block {
    grid-template-columns: auto auto;
    justify-content: center;
    gap: 0.75rem;
  }

  .years-number {
    font-size: 3.2rem;
  }

  .first-view-vertical-brand {
    display: none;
  }

  .problem-grid,
  .services-grid,
  .experience-grid {
    grid-template-columns: 1fr;
    gap: 1.25rem;
  }

  .problem-item {
    gap: 0.65rem;
    min-height: 0;
    padding: 0.75rem;
  }

  .problem-item p {
    margin-bottom: 0;
  }

  .section-callout {
    align-items: stretch;
    margin-top: 1.5rem;
    padding: 1rem 0;
  }

  .section-callout .btn,
  .section-action .btn {
    width: 100%;
    min-width: 0;
    min-height: 3rem;
  }

  .service-card-media img,
  .service-card-media .visual-placeholder {
    aspect-ratio: 16 / 9;
  }

  .service-card-body {
    padding-top: 0.65rem;
  }

  .service-label,
  .service-card h3 {
    margin-bottom: 0.3rem;
  }

  .service-card p {
    line-height: 1.65;
  }

  .section-action {
    margin-top: 1.5rem;
  }

  .why-grid {
    gap: 1.25rem;
  }

  .why-year-block {
    margin-top: 0.25rem;
  }

  .why-copy,
  .why-copy-right {
    grid-column: 1;
    padding-top: 0;
  }

  .why-copy p:last-child,
  .why-copy-right p:last-child {
    margin-bottom: 0;
  }

  .phase-grid,
  .workflow-grid {
    gap: 0.65rem;
  }

  .phase-card,
  .workflow-step {
    min-height: 0;
    padding-block: 0.65rem;
  }

  .phase-arrow,
  .workflow-arrow {
    margin-block: -0.15rem;
  }

  .section-heading-row {
    align-items: stretch;
    margin-bottom: 1.25rem;
  }

  .section-heading-row .btn {
    width: 100%;
    min-height: 2.75rem;
  }

  .experience-card img,
  .experience-card .visual-placeholder {
    width: 100%;
    aspect-ratio: 16 / 10;
  }

  .experience-card h3 {
    margin-bottom: 0;
    padding-top: 0.5rem;
  }

  .workflow-step {
    gap: 0.25rem;
  }

  .workflow-icon {
    margin-bottom: 0.3rem;
  }

  .message-grid {
    gap: 1.5rem;
  }

  .message-photo img,
  .message-photo .visual-placeholder {
    width: 100%;
    min-height: 0;
    aspect-ratio: 3 / 4;
    object-fit: cover;
  }

  .message-heading {
    margin-bottom: 1rem;
  }

  .profile-table div {
    grid-template-columns: 1fr;
    gap: 0.3rem;
    padding-block: 0.7rem;
  }

  .profile-table dd,
  .message-copy,
  .page-content,
  .contact-form-errors {
    overflow-wrap: anywhere;
    word-break: normal;
  }

  .section-final-cta {
    padding-block: 2rem;
  }

  .section-final-cta .section-content {
    gap: 1.25rem;
  }

  .section-final-cta .btn {
    min-height: 3.25rem;
  }

  .footer-inner {
    gap: 1.5rem;
    padding-block: 2rem;
  }

  .footer-identity small,
  .footer-social-unset {
    margin-top: 0.5rem;
  }

  .footer-nav ul,
  .footer-legal-nav ul {
    gap: 0;
  }

  .footer-nav a,
  .footer-legal-nav a {
    display: inline-flex;
    min-height: 2.75rem;
    align-items: center;
  }

  .contact-layout {
    gap: 1.25rem;
  }

  .contact-panel {
    width: 100%;
    padding: 1.25rem 0.9rem;
  }

  .contact-control input,
  .contact-control select,
  .contact-control textarea,
  .contact-submit .btn {
    max-width: 100%;
  }

  .contact-control textarea {
    min-height: 12rem;
  }

  .contact-privacy label {
    min-height: 2.75rem;
  }

  .contact-privacy input {
    flex: 0 0 auto;
    width: 1.25rem;
    height: 1.25rem;
  }
}