:root {
  --color-bg: #ffffff;
  --color-primary: #1378f3;
  --color-accent: #fe760a;
  --color-black: #14181f;
  --color-danger: #e5484d;
  --color-sub: #6b7280;
  --color-faint: #9aa2ad;
  --color-line: #e8eaed;
  --pico-font-family: "Hiragino Sans", "Hiragino Kaku Gothic ProN",
    "Yu Gothic", "Noto Sans JP", system-ui, sans-serif;
}

* {
  box-sizing: border-box;
}

img,
video,
svg {
  max-width: 100%;
  height: auto;
}

iframe {
  max-width: 100%;
}

html {
  scroll-padding-top: 4.5rem;
  overflow-x: clip;
  max-width: 100%;
}

body {
  margin: 0;
  color: var(--color-black);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  overflow-x: clip;
  max-width: 100%;
  overscroll-behavior-x: none;
}

a {
  color: var(--color-primary);
}

.container {
  width: 100%;
  max-width: 860px;
  margin-inline: auto;
  padding-inline: calc(1.5rem + env(safe-area-inset-left, 0px))
    calc(1.5rem + env(safe-area-inset-right, 0px));
  box-sizing: border-box;
}

@media (max-width: 640px) {
  .container {
    padding-inline: calc(1.25rem + env(safe-area-inset-left, 0px))
      calc(1.25rem + env(safe-area-inset-right, 0px));
  }
}

body.subpage .container {
  max-width: 720px;
}

/* ---- header (shared) ---- */
header.site {
  position: sticky;
  top: 0;
  z-index: 100;
  padding: 0.85rem 0;
  background: rgba(255, 255, 255, 0.78);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid rgba(232, 234, 237, 0.85);
}

header.site .logo-link {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  text-decoration: none;
}

header.site img.logo-mark {
  height: 1.9rem;
  width: auto;
  display: block;
  flex-shrink: 0;
}

header.site .logo-text {
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-black);
  white-space: nowrap;
}

header.site nav {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  row-gap: 0.6rem;
}

@media (max-width: 480px) {
  header.site .logo-text {
    display: none;
  }
}

header.site ul {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 0.6rem 0.85rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

header.site ul a {
  color: var(--color-sub);
  text-decoration: none;
  font-size: 0.9rem;
  transition: color 0.15s ease;
}

header.site ul a:hover {
  color: var(--color-black);
}

@media (max-width: 640px) {
  header.site ul {
    font-size: 0.85rem;
    gap: 0.5rem 0.7rem;
  }
}

/* ---- hero (home) ---- */
.hero {
  /* padding-block only: keep .container horizontal padding */
  padding-block: 6.5rem 5.5rem;
  position: relative;
  overflow-x: clip;
}

@media (max-width: 640px) {
  .hero {
    padding-block: 4rem 3.5rem;
  }
}

.hero::before {
  content: "";
  position: absolute;
  top: -4rem;
  right: -10%;
  width: 26rem;
  height: 26rem;
  background: radial-gradient(
    circle,
    rgba(19, 120, 243, 0.12) 0%,
    rgba(254, 118, 10, 0.08) 45%,
    rgba(255, 255, 255, 0) 70%
  );
  filter: blur(10px);
  pointer-events: none;
  z-index: -1;
}

.hero h1 {
  font-size: clamp(2.0rem, 6vw, 3.8rem);
  line-height: 1.25;
  letter-spacing: -0.01em;
  margin-bottom: 1.5rem;
  font-weight: 700;
}

.hero h1 .nowrap {
  white-space: nowrap;
}

@media (max-width: 480px) {
  .hero h1 {
    font-size: 1.65rem;
  }

  .hero h1 .nowrap {
    white-space: normal;
  }
}

/* ---- section shell (home) ---- */
section.block {
  /* padding-block only: keep .container horizontal padding */
  padding-block: 4.5rem;
  border-top: 1px solid var(--color-line);
}

section.block .kicker {
  font-size: 0.78rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: 0.6rem;
  font-weight: 600;
}

section.block h2 {
  font-size: clamp(1.4rem, 3vw, 1.7rem);
  margin-bottom: 1.75rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}

section.block p {
  color: var(--color-sub);
  line-height: 2;
}

/* ---- concept (home) ---- */
.concept-copy {
  max-width: 42rem;
}

/* ---- activities (home) ---- */
.activities-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

@media (max-width: 640px) {
  .activities-list {
    grid-template-columns: minmax(0, 1fr);
  }
}

.activities-list .card {
  display: block;
  padding: 1.5rem 1.25rem;
  border-radius: 0.85rem;
  border: 1px solid var(--color-line);
  text-decoration: none;
  color: inherit;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.activities-list .card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(20, 24, 31, 0.06);
}

.activities-list .card-primary,
.activities-list .card-accent {
  background: linear-gradient(
    165deg,
    rgba(254, 118, 10, 0.035),
    rgba(254, 118, 10, 0) 60%
  );
  border-color: rgba(254, 118, 10, 0.1);
}

.activities-list .icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.6rem;
  height: 2.6rem;
  border-radius: 0.65rem;
  margin-bottom: 0.9rem;
  font-size: 1.1rem;
}

.activities-list .card-primary .icon,
.activities-list .card-accent .icon {
  background: rgba(254, 118, 10, 0.08);
  color: var(--color-accent);
}

.activities-list .name {
  margin: 0 0 0.35rem;
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--color-black);
}

.activities-list .desc {
  margin: 0 0 0.5rem;
  color: var(--color-sub);
  font-size: 0.85rem;
  line-height: 1.6;
}

.activities-list .note {
  margin: 0;
  color: var(--color-faint);
  font-size: 0.8rem;
}

/* ---- article body (subpage) ---- */
body.subpage main {
  padding: 3.5rem 0 4.5rem;
}

body.subpage main h1 {
  font-size: clamp(1.6rem, 4vw, 2.1rem);
  font-weight: 700;
  margin-bottom: 2.5rem;
}

body.subpage main section {
  margin-bottom: 2.25rem;
}

body.subpage main h2 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 0.6rem;
}

body.subpage main p,
body.subpage main li {
  color: var(--color-sub);
  line-height: 1.9;
}

body.subpage main ul {
  padding-left: 1.4rem;
}

/* ---- company info (subpage) ---- */
.company-info {
  display: grid;
  row-gap: 0;
  border-top: 1px solid var(--color-line);
}

.company-info .row {
  display: grid;
  grid-template-columns: 8rem 1fr;
  gap: 1rem;
  padding: 1.1rem 0;
  border-bottom: 1px solid var(--color-line);
}

.company-info dt {
  color: var(--color-faint);
  font-size: 0.9rem;
}

.company-info dd {
  margin: 0;
  color: var(--color-black);
  font-weight: 500;
}

@media (max-width: 480px) {
  .company-info .row {
    grid-template-columns: 1fr;
    gap: 0.25rem;
  }
}

/* ---- footer (shared) ---- */
footer.site {
  padding: 2.5rem 0 3rem;
  text-align: center;
  color: var(--color-faint);
  font-size: 0.85rem;
  border-top: 1px solid var(--color-line);
}

footer.site a {
  color: var(--color-faint);
  text-decoration: underline;
}

footer.site .footer-logo {
  height: 3.4rem;
  width: auto;
  margin-bottom: 1.25rem;
}

@media (max-width: 480px) {
  footer.site .footer-logo {
    height: 2.6rem;
  }
}

/* ---- fade-in (home) ---- */
.fade-in {
  opacity: 0;
  transform: translateY(0.75rem);
  transition:
    opacity 0.7s ease,
    transform 0.7s ease;
}

.fade-in.is-visible {
  opacity: 1;
  transform: translateY(0);
}