/* ========================================
   トップページ追加部品
======================================== */

.section-link {
  display: inline-flex;
  align-items: center;
  gap: 12px;

  margin-top: 36px;

  color: #ffffff;

  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.04em;

  text-decoration: none;

  transition:
    gap 180ms ease,
    color 180ms ease;
}

.section-link span {
  color: var(--accent-blue);
}

.section-link:hover {
  gap: 18px;
  color: var(--accent-blue);
}

/* ========================================
   共通フッター
======================================== */

.site-footer {
  position: relative;
  z-index: 10;

  padding:
    72px
    clamp(24px, 7vw, 110px)
    26px;

  color: #ffffff;

  background:
    linear-gradient(
      180deg,
      rgba(7, 7, 17, 0.98),
      rgba(3, 3, 9, 1)
    );

  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.footer-inner {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 70px;

  width: min(1200px, 100%);
  margin: 0 auto;
}

.footer-brand {
  max-width: 360px;
}

.footer-logo {
  display: inline-flex;
  align-items: center;
  gap: 13px;

  color: #ffffff;

  font-size: 24px;
  font-weight: 700;

  text-decoration: none;
}

.footer-logo img {
  display: block;

  width: 54px;
  height: 54px;

  object-fit: contain;

  filter:
    drop-shadow(0 0 12px rgba(167, 139, 250, 0.36));
}

.footer-brand > p {
  margin: 18px 0 0;

  color: rgba(255, 255, 255, 0.54);

  font-family:
    "Caveat",
    cursive;

  font-size: 23px;
}

.footer-navigation {
    display: grid;
    grid-template-columns: repeat(3, minmax(140px, 1fr));
    gap: 64px;
}

.footer-navigation-group {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 13px;
}

.footer-navigation-title {
  margin: 0 0 7px;

  color: rgba(255, 255, 255, 0.4);

  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.footer-navigation a {
  color: rgba(255, 255, 255, 0.72);

  font-size: 13px;
  text-decoration: none;

  transition:
    color 180ms ease,
    transform 180ms ease;
}

.footer-navigation a:hover {
  color: var(--accent-blue);
  transform: translateX(3px);
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;

  width: min(1200px, 100%);
  margin: 58px auto 0;
  padding-top: 22px;

  color: rgba(255, 255, 255, 0.34);

  border-top: 1px solid rgba(255, 255, 255, 0.07);

  font-size: 10px;
  letter-spacing: 0.04em;
}

.footer-bottom p {
  margin: 0;
}

/* ========================================
   下層ページ共通
======================================== */

body.subpage {
  min-width: 320px;

  color: #ffffff;
  background: #070710;
}

.subpage-background {
  position: fixed;
  inset: 0;
  z-index: -10;

  overflow: hidden;

  background:
    radial-gradient(
      circle at 75% 10%,
      rgba(103, 232, 249, 0.08),
      transparent 30%
    ),
    radial-gradient(
      circle at 20% 40%,
      rgba(167, 139, 250, 0.12),
      transparent 36%
    ),
    linear-gradient(
      180deg,
      #0b0918,
      #070710 45%,
      #04040a
    );
}

.subpage-background-light {
  position: absolute;
  top: -260px;
  left: 50%;

  width: 760px;
  height: 760px;

  border-radius: 50%;

  background:
    radial-gradient(
      circle,
      rgba(123, 101, 255, 0.12),
      transparent 66%
    );

  transform: translateX(-50%);

  filter: blur(20px);
}

.subpage-background-grid {
  position: absolute;
  inset: 0;

  opacity: 0.055;

  background-image:
    linear-gradient(
      rgba(255, 255, 255, 0.5) 1px,
      transparent 1px
    ),
    linear-gradient(
      90deg,
      rgba(255, 255, 255, 0.5) 1px,
      transparent 1px
    );

  background-size: 72px 72px;

  mask-image:
    linear-gradient(
      180deg,
      rgba(0, 0, 0, 0.8),
      transparent 70%
    );
}

.subpage-header {
  position: relative;

  background:
    linear-gradient(
      180deg,
      rgba(4, 4, 12, 0.72),
      rgba(4, 4, 12, 0.08)
    );
}

.subpage-main {
  position: relative;
  z-index: 1;
}

.page-container {
  width: min(1160px, calc(100% - 48px));
  margin: 0 auto;
}

/* ========================================
   About：メイン見出し
======================================== */

.page-hero {
  display: flex;
  align-items: center;

  min-height: 680px;
  padding:
    120px
    0
    90px;
}

.page-eyebrow {
  margin: 0 0 24px;

  color: var(--accent-blue);

  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.25em;

  text-shadow:
    0 0 14px rgba(103, 232, 249, 0.45);
}

.page-hero h1 {
  max-width: 940px;
  margin: 0;

  font-size: clamp(48px, 7.5vw, 108px);
  font-weight: 700;
  line-height: 1.18;
  letter-spacing: -0.055em;

  text-shadow:
    0 0 30px rgba(167, 139, 250, 0.16);
}

.page-lead {
  max-width: 760px;
  margin: 40px 0 0;

  color: rgba(255, 255, 255, 0.7);

  font-size: clamp(16px, 1.7vw, 20px);
  line-height: 2.05;
}

/* ========================================
   About：共通セクション
======================================== */

.content-section {
  position: relative;

  padding:
    clamp(92px, 11vw, 160px)
    0;
}

.content-section-dark {
  background:
    linear-gradient(
      180deg,
      rgba(10, 9, 24, 0.9),
      rgba(5, 5, 13, 0.96)
    );

  border-top: 1px solid rgba(255, 255, 255, 0.06);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.content-section-accent {
  background:
    radial-gradient(
      circle at 85% 20%,
      rgba(103, 232, 249, 0.1),
      transparent 32%
    ),
    radial-gradient(
      circle at 20% 80%,
      rgba(167, 139, 250, 0.15),
      transparent 36%
    ),
    rgba(8, 7, 20, 0.96);
}

.content-grid {
  display: grid;
  grid-template-columns: minmax(260px, 0.9fr) minmax(360px, 1.2fr);
  gap: clamp(50px, 9vw, 130px);
}

.content-section h2 {
  margin: 0;

  font-size: clamp(38px, 5.3vw, 72px);
  line-height: 1.25;
  letter-spacing: -0.045em;
}

.content-copy {
  color: rgba(255, 255, 255, 0.72);

  font-size: clamp(15px, 1.55vw, 19px);
  line-height: 2.15;
}

.content-copy p {
  margin: 0;
}

.content-copy p + p {
  margin-top: 26px;
}

/* ========================================
   About：特徴カード
======================================== */

.feature-card-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;

  margin-top: 58px;
}

.feature-card {
  position: relative;

  min-height: 310px;
  padding: 31px;

  overflow: hidden;

  background:
    linear-gradient(
      145deg,
      rgba(255, 255, 255, 0.07),
      rgba(255, 255, 255, 0.018)
    );

  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 22px;

  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);

  transition:
    transform 220ms ease,
    border-color 220ms ease,
    background 220ms ease;
}

.feature-card::after {
  content: "";

  position: absolute;
  right: -80px;
  bottom: -100px;

  width: 210px;
  height: 210px;

  border-radius: 50%;

  background:
    radial-gradient(
      circle,
      rgba(167, 139, 250, 0.13),
      transparent 68%
    );
}

.feature-card:hover {
  transform: translateY(-6px);

  background:
    linear-gradient(
      145deg,
      rgba(255, 255, 255, 0.09),
      rgba(255, 255, 255, 0.025)
    );

  border-color: rgba(103, 232, 249, 0.28);
}

.feature-number {
  display: block;

  color: var(--accent-blue);

  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.18em;
}

.feature-card h3 {
  margin: 54px 0 20px;

  font-size: 25px;
  letter-spacing: -0.03em;
}

.feature-card p {
  position: relative;
  z-index: 2;

  margin: 0;

  color: rgba(255, 255, 255, 0.64);

  font-size: 14px;
  line-height: 1.95;
}

/* ========================================
   About：対応分野
======================================== */

.field-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);

  margin-top: 58px;

  border-top: 1px solid rgba(255, 255, 255, 0.11);
}

.field-item {
  display: flex;
  align-items: center;
  gap: 24px;

  min-height: 92px;
  padding: 18px 24px;

  border-bottom: 1px solid rgba(255, 255, 255, 0.11);
}

.field-item:nth-child(odd) {
  border-right: 1px solid rgba(255, 255, 255, 0.11);
}

.field-item span {
  color: var(--accent-purple);

  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.12em;
}

.field-item p {
  margin: 0;

  color: rgba(255, 255, 255, 0.82);

  font-size: 15px;
}

/* ========================================
   About：開発中表示
======================================== */

.development-box {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 50px;
}

.development-box p:not(.section-label) {
  margin: 25px 0 0;

  color: rgba(255, 255, 255, 0.62);

  font-size: 15px;
  line-height: 1.9;
}

.development-box .button {
  flex-shrink: 0;
}

/* ========================================
   タブレット
======================================== */

@media (max-width: 900px) {
  .footer-inner {
    flex-direction: column;
  }

  .footer-navigation {
    width: 100%;
  }

  .content-grid {
    grid-template-columns: 1fr;
    gap: 38px;
  }

  .feature-card-grid {
    grid-template-columns: 1fr;
  }

  .feature-card {
    min-height: auto;
  }

  .feature-card h3 {
    margin-top: 35px;
  }
}

/* ========================================
   スマートフォン
======================================== */

@media (max-width: 680px) {
  .site-footer {
    padding:
      58px
      24px
      24px;
  }

  .footer-navigation {
    grid-template-columns: 1fr 1fr;
    gap: 38px 24px;
  }

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;

    margin-top: 45px;
  }

  .page-container {
    width: calc(100% - 40px);
  }

  .page-hero {
    min-height: 590px;
    padding:
      90px
      0
      70px;
  }

  .page-hero h1 {
    font-size: clamp(46px, 14vw, 72px);
  }

  .page-lead {
    margin-top: 30px;

    font-size: 15px;
    line-height: 2;
  }

  .content-section {
    padding:
      88px
      0;
  }

  .content-section h2 {
    font-size: clamp(36px, 11vw, 56px);
  }

  .feature-card-grid {
    margin-top: 42px;
  }

  .field-list {
    grid-template-columns: 1fr;
    margin-top: 42px;
  }

  .field-item:nth-child(odd) {
    border-right: 0;
  }

  .development-box {
    flex-direction: column;
    align-items: flex-start;
  }

  .development-box .button {
    width: min(100%, 290px);
  }
}

@media (max-width: 430px) {
  .footer-navigation {
    grid-template-columns: 1fr;
  }

  .page-container {
    width: calc(100% - 32px);
  }

  .page-hero h1 br {
    display: none;
  }

  .field-item {
    gap: 17px;
    padding-inline: 10px;
  }
}