:root {
  color-scheme: light;
  --ink: #181818;
  --muted: #5e625d;
  --line: #d9ddd4;
  --paper: #fbfbf7;
  --soft: #eef2ea;
  --green: #285f52;
  --teal: #0d6b7a;
  --coral: #ba4d35;
  --gold: #a7781d;
  --white: #ffffff;
  --shadow: 0 18px 48px rgba(24, 24, 24, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family:
    "Hiragino Kaku Gothic ProN",
    "Yu Gothic",
    "Noto Sans JP",
    system-ui,
    sans-serif;
  font-size: 16px;
  line-height: 1.75;
}

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

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

a:focus-visible,
button:focus-visible {
  outline: 3px solid rgba(13, 107, 122, 0.35);
  outline-offset: 4px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 64px;
  padding: 0 32px;
  border-bottom: 1px solid rgba(217, 221, 212, 0.72);
  background: rgba(251, 251, 247, 0.9);
  backdrop-filter: blur(16px);
}

.brand {
  font-weight: 800;
}

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  align-items: center;
  justify-content: flex-end;
}

.nav a {
  min-width: 88px;
  min-height: 40px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 14px;
  border-radius: 8px;
  color: var(--ink);
  font-size: 15px;
  font-weight: 850;
}

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

.nav a[aria-current="page"] {
  color: var(--ink);
  background: var(--soft);
}

.hero {
  min-height: 78vh;
  display: grid;
  align-items: end;
  padding: 112px 32px 80px;
  color: var(--white);
  background-image:
    linear-gradient(90deg, rgba(24, 24, 24, 0.94), rgba(24, 24, 24, 0.68) 48%, rgba(24, 24, 24, 0.36)),
    url("./assets/platform-overview.svg");
  background-size: cover;
  background-position: center;
  border-bottom: 1px solid var(--line);
}

.hero-inner {
  width: min(980px, 100%);
  text-shadow: 0 2px 18px rgba(0, 0, 0, 0.45);
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--gold);
  font-size: 13px;
  font-weight: 800;
  text-transform: uppercase;
}

.hero .eyebrow {
  color: #f1c15b;
}

h1,
h2,
h3,
p {
  overflow-wrap: break-word;
}

h1 {
  margin: 0;
  max-width: 980px;
  font-size: 56px;
  line-height: 1.04;
  letter-spacing: 0;
}

h2 {
  margin: 0;
  font-size: 34px;
  line-height: 1.25;
  letter-spacing: 0;
}

h3 {
  margin: 0;
  font-size: 21px;
  line-height: 1.35;
  letter-spacing: 0;
}

.lead {
  max-width: 740px;
  margin: 24px 0 0;
  font-size: 20px;
  line-height: 1.8;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 32px;
}

.button {
  min-width: 144px;
  min-height: 46px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 18px;
  border: 1px solid transparent;
  border-radius: 8px;
  font-weight: 800;
}

.button.primary {
  color: var(--white);
  background: var(--coral);
}

.button.primary:hover {
  background: #9f3f2b;
}

.button.secondary {
  color: var(--white);
  border-color: rgba(255, 255, 255, 0.6);
  background: rgba(255, 255, 255, 0.08);
}

.button.secondary:hover {
  background: rgba(255, 255, 255, 0.18);
}

.button.tertiary {
  color: var(--green);
  border-color: var(--green);
  background: var(--white);
}

.button.tertiary:hover {
  color: var(--white);
  background: var(--green);
}

.section {
  width: min(1180px, calc(100% - 64px));
  margin: 56px auto 0;
  padding: 24px 0 64px;
}

.section.band {
  width: 100%;
  margin-top: 24px;
  padding: 72px max(32px, calc((100% - 1180px) / 2)) 80px;
  background: var(--soft);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.section-heading {
  max-width: 760px;
  margin-bottom: 32px;
}

.section-heading p:not(.eyebrow) {
  margin: 14px 0 0;
  color: var(--muted);
}

.section-heading.compact {
  margin-bottom: 28px;
}

.project-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
}

.story-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.story-card {
  min-height: 260px;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--white);
}

.story-card p:not(.project-kicker) {
  margin: 14px 0 0;
  color: var(--muted);
}

.stats-section {
  padding-top: 10px;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  margin-top: 28px;
}

.stat-card {
  min-height: 230px;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--white);
}

.stat-number {
  margin: 0 0 14px;
  color: var(--green);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 58px;
  font-weight: 800;
  line-height: 0.95;
}

.stat-card h3 {
  margin-bottom: 10px;
}

.stat-card p:not(.stat-number) {
  margin: 0;
  color: var(--muted);
}

.thinking-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.thinking-card {
  min-height: 210px;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--white);
}

.thinking-card p:not(.project-kicker) {
  margin: 12px 0 0;
  color: var(--muted);
}

.principle-panel {
  margin-top: 20px;
  padding: 32px;
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  gap: 24px;
  align-items: center;
  color: var(--white);
  border-radius: 8px;
  background: var(--green);
}

.principle-panel .eyebrow {
  color: #f1c15b;
}

.principle-panel p:not(.eyebrow) {
  margin: 0;
  color: rgba(255, 255, 255, 0.82);
}

.reason-table {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--white);
}

.reason-row {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 1.05fr) minmax(0, 0.78fr) minmax(0, 1.15fr);
  border-top: 1px solid var(--line);
}

.reason-row:first-child {
  border-top: 0;
}

.reason-row > div {
  min-width: 0;
  padding: 16px 18px;
  border-left: 1px solid var(--line);
  overflow-wrap: anywhere;
}

.reason-row > div:first-child {
  border-left: 0;
}

.reason-head {
  color: var(--white);
  background: var(--teal);
  font-weight: 900;
}

.tech-grid {
  margin-top: 24px;
}

.roadmap-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: none;
}

.roadmap-list li {
  min-height: 120px;
  padding: 20px;
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 14px;
  align-items: start;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--white);
}

.roadmap-list span {
  width: 44px;
  height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
  border-radius: 8px;
  background: var(--coral);
  font-size: 13px;
  font-weight: 900;
}

.roadmap-list p {
  margin: 0;
  color: var(--muted);
  font-weight: 700;
}

.conversation-section {
  margin-top: 0;
}

.conversation-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.works-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.work-card {
  min-height: 220px;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--white);
}

.work-card p:not(.project-kicker) {
  margin: 12px 0 0;
  color: var(--muted);
}

.usecase-section {
  margin-top: 0;
}

.usecase-grid {
  display: grid;
  gap: 18px;
}

.usecase-card {
  min-width: 0;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--white);
}

.usecase-card h2 {
  max-width: 920px;
  font-size: 25px;
  line-height: 1.35;
}

.usecase-problem {
  max-width: 940px;
  margin: 12px 0 0;
  color: var(--muted);
}

.usecase-detail {
  display: grid;
  grid-template-columns: 160px minmax(0, 1fr);
  gap: 10px 16px;
  margin: 20px 0 0;
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

.usecase-detail dt {
  color: var(--teal);
  font-size: 13px;
  font-weight: 900;
}

.usecase-detail dd {
  min-width: 0;
  margin: 0;
  color: var(--muted);
  overflow-wrap: anywhere;
}

.section-actions {
  margin-top: 24px;
  display: flex;
  justify-content: center;
}

.page-hero {
  width: min(1180px, calc(100% - 64px));
  margin: 0 auto;
  padding: 96px 0 48px;
}

.page-hero h1 {
  color: var(--ink);
}

.page-hero p:not(.eyebrow) {
  max-width: 780px;
  margin: 18px 0 0;
  color: var(--muted);
}

.works-catalog {
  margin-top: 0;
}

.hobby-hero {
  padding-bottom: 36px;
}

.hobby-section {
  margin-top: 0;
}

.hobby-challenge-section {
  padding-top: 0;
}

.hobby-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
}

.hobby-card {
  min-width: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--white);
}

.hobby-card img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  background: #050505;
  border-bottom: 1px solid var(--line);
}

.hobby-card-body {
  padding: 16px;
}

.hobby-card h2,
.hobby-card h3 {
  font-size: 20px;
  line-height: 1.3;
}

.hobby-card p {
  margin: 10px 0 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.65;
}

.category-block {
  padding: 36px 0;
  border-top: 1px solid var(--line);
}

.category-block:first-child {
  padding-top: 0;
  border-top: 0;
}

.project-card {
  min-width: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--white);
}

.project-card img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  background: #f4f6f0;
  border-bottom: 1px solid var(--line);
}

.project-body {
  padding: 24px;
}

.project-kicker {
  margin: 0 0 8px;
  color: var(--teal);
  font-size: 13px;
  font-weight: 900;
  text-transform: uppercase;
}

.project-body p:not(.project-kicker) {
  margin: 14px 0 0;
  color: var(--muted);
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
}

.tag-list li {
  min-height: 30px;
  display: inline-flex;
  align-items: center;
  padding: 4px 10px;
  border-radius: 8px;
  color: var(--green);
  background: #e6eee8;
  font-size: 13px;
  font-weight: 800;
}

.tag-list a {
  color: inherit;
  text-decoration: none;
}

.tag-list li:has(a):hover {
  background: #d7e6dc;
}

.tag-list a:focus-visible {
  border-radius: 6px;
  outline: 2px solid rgba(13, 107, 122, 0.38);
  outline-offset: 2px;
}

.direction-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 420px;
  gap: 32px;
  align-items: start;
}

.direction-copy > p {
  max-width: 720px;
  margin: 0;
  color: var(--muted);
}

.focus-list {
  display: grid;
  gap: 14px;
  margin: 28px 0 0;
}

.focus-list div {
  padding-left: 18px;
  border-left: 4px solid var(--coral);
}

.focus-list dt {
  font-weight: 900;
}

.focus-list dd {
  margin: 4px 0 0;
  color: var(--muted);
}

.visual-panel {
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--white);
}

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

.visual-panel figcaption {
  padding: 12px 16px;
  color: var(--muted);
  border-top: 1px solid var(--line);
  font-size: 13px;
  font-weight: 800;
}

.writing-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.writing-item {
  min-height: 210px;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--white);
}

.writing-item p {
  margin: 12px 0 0;
  color: var(--muted);
}

.contact-section {
  width: min(1180px, calc(100% - 64px));
  margin: 24px auto 0;
  padding: 48px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 24px;
  align-items: center;
  color: var(--white);
  background: var(--green);
  border-radius: 8px;
}

.contact-section .eyebrow {
  color: #f1c15b;
}

.contact-section p:not(.eyebrow) {
  max-width: 760px;
  margin: 14px 0 0;
  color: rgba(255, 255, 255, 0.82);
}

.site-footer {
  width: min(1180px, calc(100% - 64px));
  min-height: 88px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: var(--muted);
  font-size: 14px;
}

.site-footer a {
  font-weight: 800;
}

.footer-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 18px;
  justify-content: flex-end;
}

.footer-nav a {
  color: var(--ink);
  font-size: 14px;
  font-weight: 850;
}

.footer-nav a[aria-current="page"] {
  color: var(--ink);
}

@media (max-width: 900px) {
  .site-header {
    padding: 0 18px;
  }

  .nav a {
    min-width: 78px;
    padding: 0 10px;
    font-size: 14px;
  }

  .hero {
    min-height: 72vh;
    padding: 96px 24px 64px;
  }

  h1 {
    font-size: 44px;
  }

  h2 {
    font-size: 29px;
  }

  .lead {
    font-size: 18px;
  }

  .section,
  .page-hero,
  .contact-section,
  .site-footer {
    width: min(100% - 36px, 1180px);
  }

  .project-grid,
  .story-grid,
  .stats-grid,
  .thinking-grid,
  .direction-layout,
  .writing-grid,
  .conversation-grid,
  .works-grid,
  .hobby-grid,
  .roadmap-list,
  .contact-section {
    grid-template-columns: 1fr;
  }

  .principle-panel {
    grid-template-columns: 1fr;
  }

  .reason-row {
    grid-template-columns: 1fr;
  }

  .usecase-detail {
    grid-template-columns: 1fr;
  }

  .reason-row > div {
    border-left: 0;
    border-top: 1px solid var(--line);
  }

  .reason-row > div:first-child {
    border-top: 0;
  }

  .section.band {
    padding-left: 18px;
    padding-right: 18px;
  }

  .contact-section {
    padding: 32px;
  }
}

@media (max-width: 640px) {
  body {
    font-size: 15px;
  }

  .site-header {
    position: static;
    min-height: auto;
    padding: 16px;
    display: block;
  }

  .brand {
    display: inline-flex;
    min-height: 36px;
    align-items: center;
  }

  .nav {
    margin-top: 8px;
    justify-content: flex-start;
  }

  .nav a {
    min-width: 78px;
    padding: 0 10px;
    font-size: 14px;
  }

  .hero {
    min-height: 70vh;
    padding: 72px 18px 52px;
    background-image:
      linear-gradient(90deg, rgba(24, 24, 24, 0.94), rgba(24, 24, 24, 0.78)),
      url("./assets/platform-overview.svg");
    background-position: center top;
  }

  h1 {
    font-size: 36px;
  }

  h2 {
    font-size: 25px;
  }

  h3 {
    font-size: 19px;
  }

  .lead {
    font-size: 16px;
  }

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

  .button {
    width: 100%;
  }

  .project-body,
  .work-card,
  .writing-item,
  .hobby-card {
    padding: 18px;
  }

  .contact-section {
    padding: 24px;
  }

  .site-footer {
    padding: 24px 0;
    display: grid;
    gap: 10px;
  }

  .footer-nav {
    justify-content: flex-start;
  }
}