:root {
  --color-canvas: #ffffff;
  --color-paper: #faf8f3;
  --color-paper-warm: #f5f0e8;
  --color-paper-deep: #ece3d5;
  --color-surface: #ffffff;
  --color-surface-soft: #f8f6f1;
  --color-surface-muted: #f1ede5;
  --color-ink: #1f1f1d;
  --color-ink-soft: #3b3935;
  --color-ink-muted: #6e6a62;
  --color-ink-pale: #9a9388;
  --color-line: #e4ded3;
  --color-line-soft: #eee8de;
  --color-line-strong: #cfc4b4;
  --color-earth: #7a5c3e;
  --color-earth-dark: #4e3927;
  --color-earth-soft: #e8dccb;
  --color-green: #4f5d50;
  --color-green-dark: #2f3a31;
  --color-green-soft: #e3e8df;
  --color-bluegray: #59646a;
  --color-bluegray-dark: #384146;
  --color-bluegray-soft: #e5eaec;
  --color-gold: #b99a5b;
  --color-footer: #23211e;
  --color-footer-muted: #b9b0a4;
  --font-base: "Noto Sans JP", system-ui, -apple-system, BlinkMacSystemFont, "Helvetica Neue", sans-serif;
  --font-latin: system-ui, -apple-system, BlinkMacSystemFont, "Helvetica Neue", sans-serif;
  --radius-xs: 2px;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 18px;
  --radius-pill: 9999px;
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-8: 32px;
  --space-10: 40px;
  --space-section: 80px;
  --space-section-sm: 56px;
  --container: 1240px;
  --content: 760px;
  --shadow-card: rgba(35, 33, 30, 0.06) 0 8px 24px -12px;
  --header-height: 72px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--color-canvas);
  color: var(--color-ink);
  font-family: var(--font-base);
  font-size: 16px;
  line-height: 1.9;
  letter-spacing: 0;
}

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

a {
  color: inherit;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.22em;
}

a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible,
select:focus-visible {
  outline: 3px solid var(--color-earth);
  outline-offset: 3px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  height: var(--header-height);
  background: rgba(255, 255, 255, 0.94);
  border-bottom: 1px solid var(--color-line-soft);
  backdrop-filter: blur(12px);
}

.header-inner {
  max-width: calc(var(--container) + 64px);
  height: 100%;
  margin: 0 auto;
  padding: 0 var(--space-8);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
}

.logo {
  display: inline-flex;
  flex-direction: column;
  gap: 0;
  text-decoration: none;
  min-width: 8rem;
}

.logo strong {
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.logo span {
  color: var(--color-ink-muted);
  font-size: 11px;
  line-height: 1.5;
}

.nav-toggle {
  display: none;
}

.nav-label {
  display: none;
  width: 44px;
  height: 44px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-pill);
  align-items: center;
  justify-content: center;
  color: var(--color-ink);
}

.nav-label::before {
  content: "☰";
  font-size: 22px;
  line-height: 1;
}

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

.nav a {
  padding: 8px 9px;
  color: var(--color-ink-muted);
  font-size: 14px;
  font-weight: 500;
  text-decoration: none;
  white-space: nowrap;
}

.nav a:hover {
  color: var(--color-ink);
}

.nav .nav-cta {
  min-height: 40px;
  margin-left: var(--space-2);
  padding: 9px 18px;
  border-radius: var(--radius-pill);
  background: var(--color-ink);
  color: #fff;
}

.hero,
.page-hero {
  background: var(--color-paper);
}

.hero {
  padding: 96px var(--space-8) var(--space-section);
}

.hero-grid,
.split {
  max-width: var(--container);
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(320px, 0.95fr);
  gap: 56px;
  align-items: center;
}

.hero-grid {
  grid-template-columns: minmax(0, 0.9fr) minmax(420px, 1.1fr);
}

.hero .image-frame img {
  aspect-ratio: 5 / 4;
}

.page-hero {
  padding: 88px var(--space-8) 72px;
}

.page-hero .container {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(300px, 0.7fr);
  gap: 48px;
  align-items: center;
}

.eyebrow {
  margin: 0 0 var(--space-3);
  color: var(--color-earth);
  font-family: var(--font-latin);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.12em;
  line-height: 1.4;
  text-transform: uppercase;
}

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

h1 {
  max-width: 920px;
  margin-bottom: var(--space-6);
  font-size: clamp(34px, 6vw, 56px);
  font-weight: 650;
  line-height: 1.28;
  letter-spacing: 0;
}

h2 {
  max-width: var(--content);
  margin-bottom: var(--space-4);
  font-size: clamp(26px, 3vw, 32px);
  font-weight: 650;
  line-height: 1.42;
  letter-spacing: 0;
}

h3 {
  margin-bottom: var(--space-3);
  font-size: 21px;
  font-weight: 650;
  line-height: 1.5;
  letter-spacing: 0;
}

.lead {
  max-width: var(--content);
  color: var(--color-ink-muted);
  font-size: 18px;
  line-height: 1.9;
}

.container {
  max-width: var(--container);
  margin: 0 auto;
}

.section {
  padding: var(--space-section) var(--space-8);
}

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

.section.paper {
  background: var(--color-paper-warm);
}

.section.deep {
  background: var(--color-paper-deep);
}

.section-head {
  max-width: var(--container);
  margin: 0 auto var(--space-10);
}

.section-head.center {
  text-align: center;
}

.section-head.center h2,
.section-head.center .lead {
  margin-right: auto;
  margin-left: auto;
}

.section-head.split-head {
  display: grid;
  grid-template-columns: minmax(260px, 0.55fr) minmax(320px, 1fr);
  gap: var(--space-10);
  align-items: end;
}

.section-actions {
  display: grid;
  gap: var(--space-5);
  justify-items: start;
}

.work-meta {
  margin-bottom: var(--space-2);
  color: var(--color-ink-pale);
  font-size: 13px;
  line-height: 1.6;
}

.grid {
  display: grid;
  gap: var(--space-5);
}

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

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

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

.card,
.article-card,
.price-card,
.step-card {
  background: var(--color-surface);
  border: 1px solid var(--color-line-soft);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  box-shadow: var(--shadow-card);
}

.card.soft {
  background: var(--color-surface-soft);
}

.card.earth {
  background: var(--color-earth-soft);
  color: var(--color-earth-dark);
}

.card.green {
  background: var(--color-green-soft);
  color: var(--color-green-dark);
}

.card.blue {
  background: var(--color-bluegray-soft);
  color: var(--color-bluegray-dark);
}

.concept-visual {
  position: relative;
  overflow: hidden;
  min-height: 150px;
  margin-bottom: var(--space-5);
  border: 1px solid rgba(207, 196, 180, 0.7);
  border-radius: var(--radius-lg);
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.74), rgba(245, 240, 232, 0.82)),
    var(--color-paper);
}

.card-image {
  overflow: hidden;
  margin: calc(var(--space-8) * -1) calc(var(--space-8) * -1) var(--space-6);
  border-bottom: 1px solid var(--color-line-soft);
  border-radius: var(--radius-xl) var(--radius-xl) 0 0;
  background: var(--color-paper-warm);
}

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

.concept-visual::before,
.concept-visual::after {
  position: absolute;
  content: "";
  display: block;
}

.visual-ai-axis {
  background:
    radial-gradient(circle at 50% 54%, var(--color-earth) 0 15px, transparent 16px),
    radial-gradient(circle at 18% 25%, var(--color-bluegray-soft) 0 20px, transparent 21px),
    radial-gradient(circle at 82% 24%, var(--color-green-soft) 0 20px, transparent 21px),
    radial-gradient(circle at 22% 78%, var(--color-earth-soft) 0 22px, transparent 23px),
    radial-gradient(circle at 78% 78%, var(--color-surface-muted) 0 22px, transparent 23px),
    linear-gradient(135deg, rgba(255,255,255,.8), rgba(245,240,232,.9));
}

.visual-ai-axis::before {
  inset: 34px 34px;
  border: 1px solid var(--color-line-strong);
  border-right: 0;
  border-bottom: 0;
  transform: rotate(45deg);
}

.visual-scattered {
  background:
    radial-gradient(circle at 18% 24%, var(--color-earth-soft) 0 16px, transparent 17px),
    radial-gradient(circle at 78% 22%, var(--color-bluegray-soft) 0 18px, transparent 19px),
    radial-gradient(circle at 26% 74%, var(--color-green-soft) 0 18px, transparent 19px),
    radial-gradient(circle at 74% 72%, var(--color-surface-muted) 0 16px, transparent 17px),
    radial-gradient(circle at 50% 52%, var(--color-ink) 0 10px, transparent 11px),
    linear-gradient(135deg, rgba(255,255,255,.82), rgba(245,240,232,.88));
}

.visual-scattered::before {
  inset: 40px 30px;
  background:
    linear-gradient(26deg, transparent 0 47%, var(--color-line-strong) 48% 50%, transparent 51%),
    linear-gradient(154deg, transparent 0 47%, var(--color-line-strong) 48% 50%, transparent 51%),
    linear-gradient(90deg, transparent 0 47%, var(--color-line-strong) 48% 50%, transparent 51%);
}

.visual-fab-baf {
  background:
    linear-gradient(90deg, transparent 0 31%, var(--color-line) 31% 32%, transparent 32% 68%, var(--color-line) 68% 69%, transparent 69%),
    radial-gradient(circle at 18% 50%, var(--color-earth-soft) 0 28px, transparent 29px),
    radial-gradient(circle at 50% 50%, var(--color-ink) 0 13px, transparent 14px),
    radial-gradient(circle at 82% 50%, var(--color-green-soft) 0 28px, transparent 29px),
    linear-gradient(135deg, rgba(255,255,255,.84), rgba(245,240,232,.9));
}

.visual-fab-baf::before {
  width: 42px;
  height: 42px;
  left: calc(50% - 21px);
  top: calc(50% - 21px);
  border: 1px solid var(--color-earth);
  border-radius: 50%;
}

.visual-journey {
  background:
    radial-gradient(circle at 18% 72%, var(--color-surface-muted) 0 14px, transparent 15px),
    radial-gradient(circle at 38% 48%, var(--color-earth-soft) 0 15px, transparent 16px),
    radial-gradient(circle at 60% 36%, var(--color-bluegray-soft) 0 15px, transparent 16px),
    radial-gradient(circle at 82% 25%, var(--color-green-soft) 0 17px, transparent 18px),
    linear-gradient(135deg, rgba(255,255,255,.84), rgba(245,240,232,.9));
}

.visual-journey::before {
  left: 18%;
  right: 18%;
  top: 52%;
  height: 2px;
  background: var(--color-line-strong);
  transform: rotate(-18deg);
}

.visual-core,
.visual-structure,
.visual-route,
.visual-axis,
.visual-cluster,
.visual-study {
  background:
    linear-gradient(135deg, rgba(255,255,255,.84), rgba(245,240,232,.9)),
    var(--color-paper);
}

.visual-core::before {
  width: 58px;
  height: 58px;
  left: calc(50% - 29px);
  top: calc(50% - 29px);
  border: 12px solid var(--color-earth-soft);
  border-radius: 50%;
  background: var(--color-earth);
}

.visual-core::after {
  inset: 24px;
  border: 1px solid var(--color-line-strong);
  border-radius: 50%;
}

.visual-structure::before {
  inset: 32px 42px;
  background:
    linear-gradient(var(--color-line-strong), var(--color-line-strong)) 50% 50% / 2px 70% no-repeat,
    linear-gradient(var(--color-line-strong), var(--color-line-strong)) 50% 28% / 72% 2px no-repeat,
    radial-gradient(circle at 50% 18%, var(--color-earth) 0 13px, transparent 14px),
    radial-gradient(circle at 18% 76%, var(--color-bluegray-soft) 0 18px, transparent 19px),
    radial-gradient(circle at 50% 76%, var(--color-green-soft) 0 18px, transparent 19px),
    radial-gradient(circle at 82% 76%, var(--color-earth-soft) 0 18px, transparent 19px);
}

.visual-route::before {
  left: 16%;
  right: 16%;
  top: 50%;
  height: 2px;
  background: var(--color-line-strong);
}

.visual-route::after {
  inset: 36px 28px;
  background:
    radial-gradient(circle at 14% 50%, var(--color-earth-soft) 0 17px, transparent 18px),
    radial-gradient(circle at 50% 50%, var(--color-bluegray-soft) 0 17px, transparent 18px),
    radial-gradient(circle at 86% 50%, var(--color-green-soft) 0 17px, transparent 18px);
}

.visual-axis::before {
  width: 72px;
  height: 72px;
  left: 24px;
  top: 34px;
  border-radius: var(--radius-md);
  background: var(--color-earth-soft);
}

.visual-axis::after {
  right: 28px;
  top: 40px;
  width: 46%;
  height: 68px;
  border-top: 2px solid var(--color-earth);
  border-bottom: 2px solid var(--color-earth);
}

.visual-cluster::before {
  inset: 28px 26px;
  background:
    radial-gradient(circle at 24% 28%, var(--color-earth-soft) 0 16px, transparent 17px),
    radial-gradient(circle at 68% 24%, var(--color-bluegray-soft) 0 16px, transparent 17px),
    radial-gradient(circle at 36% 70%, var(--color-green-soft) 0 16px, transparent 17px),
    radial-gradient(circle at 76% 72%, var(--color-surface-muted) 0 16px, transparent 17px),
    linear-gradient(24deg, transparent 0 48%, var(--color-line-strong) 49% 51%, transparent 52%),
    linear-gradient(132deg, transparent 0 48%, var(--color-line-strong) 49% 51%, transparent 52%);
}

.visual-study::before {
  left: 30px;
  right: 30px;
  top: 42px;
  height: 62px;
  border: 1px solid var(--color-line-strong);
  border-radius: var(--radius-md);
  background:
    linear-gradient(90deg, var(--color-paper) 0 49%, var(--color-line) 49% 51%, var(--color-paper-warm) 51%);
}

.visual-study::after {
  left: 54px;
  right: 54px;
  top: 64px;
  height: 2px;
  background: var(--color-earth);
  box-shadow: 0 14px 0 var(--color-green), 0 28px 0 var(--color-bluegray);
}

.price-card.featured {
  background: var(--color-paper);
  border: 2px solid var(--color-earth);
}

.price {
  margin: 0 0 var(--space-3);
  font-size: 30px;
  font-weight: 700;
  line-height: 1.3;
}

.muted {
  color: var(--color-ink-muted);
}

.badge-list,
.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  padding: 0;
  margin: var(--space-5) 0 0;
  list-style: none;
}

.badge-list li,
.tag {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  padding: 4px 10px;
  border-radius: var(--radius-pill);
  background: var(--color-surface-muted);
  color: var(--color-ink-muted);
  font-size: 13px;
  line-height: 1.5;
}

.number {
  display: inline-flex;
  width: 36px;
  height: 36px;
  margin-bottom: var(--space-4);
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-pill);
  background: var(--color-ink);
  color: #fff;
  font-size: 12px;
  font-weight: 700;
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-top: var(--space-8);
}

.button-row .lead {
  flex-basis: 100%;
  margin-bottom: var(--space-2);
}

.button {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  padding: 12px 24px;
  border: 1px solid transparent;
  border-radius: var(--radius-pill);
  font-size: 14px;
  font-weight: 700;
  line-height: 1.4;
  text-decoration: none;
}

.button.primary {
  background: var(--color-ink);
  color: #fff;
}

.button.earth {
  background: var(--color-earth);
  color: #fff;
}

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

.image-frame {
  overflow: hidden;
  border-radius: var(--radius-xl);
  border: 1px solid var(--color-line-soft);
  background: var(--color-paper-warm);
}

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

.wide-image img {
  aspect-ratio: 16 / 9;
}

.quote {
  margin: 0;
  padding: var(--space-8);
  border-left: 4px solid var(--color-earth);
  background: var(--color-paper);
  color: var(--color-ink-soft);
  font-size: 18px;
  line-height: 1.9;
}

.table-wrap {
  overflow: hidden;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

th,
td {
  padding: 15px 18px;
  border-bottom: 1px solid var(--color-line-soft);
  text-align: left;
  vertical-align: top;
}

th {
  width: 30%;
  background: var(--color-surface-soft);
  color: var(--color-ink-soft);
  font-weight: 700;
}

tr:last-child th,
tr:last-child td {
  border-bottom: 0;
}

.faq details {
  border-bottom: 1px solid var(--color-line);
  background: var(--color-surface);
}

.faq summary {
  position: relative;
  cursor: pointer;
  min-height: 44px;
  padding: var(--space-5) 0 var(--space-5) 48px;
  font-weight: 700;
  list-style: none;
}

.faq summary::marker {
  content: "";
}

.faq summary::-webkit-details-marker {
  display: none;
}

.faq summary::before {
  position: absolute;
  left: 6px;
  top: 50%;
  width: auto;
  height: auto;
  border: 0;
  border-radius: 0;
  background: transparent;
  color: var(--color-earth-dark);
  content: "▶";
  display: block;
  font-size: 10px;
  line-height: 1;
  transform: translateY(-50%);
}

.faq details[open] summary::before {
  content: "▼";
}

.faq p {
  padding-bottom: var(--space-5);
  color: var(--color-ink-muted);
}

.cta {
  max-width: var(--container);
  margin: 0 auto;
  padding: var(--space-section-sm);
  border-radius: 24px;
  background: var(--color-ink);
  color: #fff;
}

.cta .lead {
  color: rgba(255, 255, 255, 0.78);
}

.cta:not(.soft) .button.secondary {
  border-color: rgba(255, 255, 255, 0.48);
  color: #fff;
}

.cta:not(.soft) .button.secondary:hover {
  background: rgba(255, 255, 255, 0.1);
}

.cta.soft {
  border: 1px solid var(--color-line);
  background: var(--color-paper-warm);
  color: var(--color-ink);
}

.cta.soft .lead {
  color: var(--color-ink-muted);
}

.form {
  display: grid;
  gap: var(--space-4);
}

label {
  display: grid;
  gap: var(--space-2);
  color: var(--color-ink-soft);
  font-weight: 700;
}

input,
select,
textarea {
  width: 100%;
  min-height: 44px;
  border: 1px solid var(--color-line-strong);
  border-radius: var(--radius-md);
  padding: 11px 14px;
  background: var(--color-surface);
  color: var(--color-ink);
  font: inherit;
}

textarea {
  min-height: 160px;
  resize: vertical;
}

.site-footer {
  padding: var(--space-section) var(--space-8);
  background: var(--color-footer);
  color: #fff;
}

.footer-grid {
  max-width: var(--container);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.1fr repeat(3, 1fr);
  gap: var(--space-8);
}

.site-footer a {
  display: block;
  padding: 3px 0;
  color: var(--color-footer-muted);
  text-decoration: none;
}

.site-footer h2,
.site-footer h3 {
  color: #fff;
  font-size: 16px;
}

.copyright {
  max-width: var(--container);
  margin: var(--space-10) auto 0;
  color: var(--color-footer-muted);
  font-size: 13px;
}

@media (max-width: 920px) {
  .header-inner {
    padding: 0 var(--space-5);
  }

  .nav-label {
    display: inline-flex;
  }

  .nav {
    position: absolute;
    top: var(--header-height);
    right: var(--space-5);
    left: var(--space-5);
    display: none;
    padding: var(--space-4);
    border: 1px solid var(--color-line);
    border-radius: var(--radius-xl);
    background: var(--color-surface);
    box-shadow: var(--shadow-card);
  }

  .nav-toggle:checked ~ .nav {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .nav .nav-cta {
    margin-left: 0;
    text-align: center;
  }

  .hero-grid,
  .split,
  .page-hero .container,
  .section-head.split-head,
  .grid.two,
  .grid.three,
  .grid.four,
  .footer-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 560px) {
  :root {
    --space-section: 56px;
    --space-section-sm: 36px;
  }

  .hero,
  .page-hero,
  .section,
  .site-footer {
    padding-right: var(--space-5);
    padding-left: var(--space-5);
  }

  .hero {
    padding-top: 64px;
  }

  .card,
  .article-card,
  .price-card,
  .step-card,
  .cta {
    padding: var(--space-6);
    border-radius: var(--radius-lg);
  }

  .card-image {
    margin: calc(var(--space-6) * -1) calc(var(--space-6) * -1) var(--space-5);
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
  }

  .button {
    width: 100%;
  }

  .nav-toggle:checked ~ .nav {
    grid-template-columns: 1fr;
  }

  th,
  td {
    display: block;
    width: 100%;
  }
}