/* ============================================================
   Design tokens
   ============================================================ */
:root {
  --c-black: #111111;
  --c-white: #ffffff;
  --c-gray-100: #f5f5f5;
  --c-gray-300: #d9d9d9;
  --c-gray-600: #6b6b6b;
  --font-sans: "IBM Plex Sans JP", system-ui, sans-serif;
  --font-mono: "IBM Plex Mono", monospace;
  --nav-height: 72px;
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
}

/* ============================================================
   Base
   ============================================================ */
html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--nav-height);
}

body {
  font-family: var(--font-sans);
  color: var(--c-black);
  background: var(--c-white);
  line-height: 1.9;
  letter-spacing: 0.02em;
  -webkit-font-smoothing: antialiased;
}

::selection {
  background: var(--c-black);
  color: var(--c-white);
}

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

:focus-visible {
  outline: 2px solid var(--c-black);
  outline-offset: 3px;
}

/* ============================================================
   共通パーツ
   ============================================================ */
.section { padding: 120px 0; }

.section-label {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--c-gray-600);
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 24px;
}
.section-label::after {
  content: "";
  flex: 0 0 48px;
  height: 1px;
  background: var(--c-black);
}

.section-title {
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 700;
  letter-spacing: 0.04em;
  line-height: 1.4;
  margin-bottom: 48px;
}

.btn-mono {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  letter-spacing: 0.15em;
  color: var(--c-white);
  background: var(--c-black);
  border: 1px solid var(--c-black);
  padding: 14px 40px;
  text-decoration: none;
  transition: background 0.3s var(--ease-out), color 0.3s var(--ease-out), transform 0.3s var(--ease-out);
}
.btn-mono:hover,
.btn-mono:focus-visible {
  background: var(--c-white);
  color: var(--c-black);
  transform: translateY(-2px);
}

/* ============================================================
   スクロールリビール
   ============================================================ */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.8s var(--ease-out), transform 0.8s var(--ease-out);
}
.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}
.reveal[data-delay="1"] { transition-delay: 0.1s; }
.reveal[data-delay="2"] { transition-delay: 0.2s; }
.reveal[data-delay="3"] { transition-delay: 0.3s; }

/* ============================================================
   Navbar
   ============================================================ */
.site-nav {
  height: var(--nav-height);
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s ease;
}
.site-nav.is-scrolled {
  border-bottom-color: var(--c-gray-300);
}

.site-nav .navbar-brand {
  font-weight: 700;
  letter-spacing: 0.06em;
  font-size: 1.05rem;
  display: flex;
  align-items: center;
  gap: 10px;
}
.site-nav .brand-mark {
  width: 28px;
  height: 28px;
  display: block;
}
.site-nav .navbar-brand small {
  font-family: var(--font-mono);
  font-weight: 400;
  font-size: 0.65rem;
  letter-spacing: 0.2em;
  color: var(--c-gray-600);
}

.site-nav .nav-link {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.15em;
  color: var(--c-gray-600);
  padding: 8px 16px;
  position: relative;
  transition: color 0.3s ease;
}
.site-nav .nav-link::after {
  content: "";
  position: absolute;
  left: 16px;
  right: 16px;
  bottom: 2px;
  height: 1px;
  background: var(--c-black);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s var(--ease-out);
}
.site-nav .nav-link:hover,
.site-nav .nav-link:focus-visible,
.site-nav .nav-link.active {
  color: var(--c-black);
}
.site-nav .nav-link:hover::after,
.site-nav .nav-link:focus-visible::after,
.site-nav .nav-link.active::after {
  transform: scaleX(1);
}

/* ============================================================
   Header (Hero)
   ============================================================ */
.hero {
  min-height: calc(100vh - var(--nav-height));
  display: flex;
  align-items: center;
  padding: 80px 0;
  border-bottom: 1px solid var(--c-gray-300);
}

.hero-eyebrow {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.3em;
  color: var(--c-gray-600);
  margin-bottom: 24px;
}

.hero-title {
  font-size: clamp(2.2rem, 5.5vw, 4.2rem);
  font-weight: 700;
  line-height: 1.35;
  letter-spacing: 0.03em;
  margin-bottom: 32px;
}

.hero-lead {
  font-size: 1rem;
  color: var(--c-gray-600);
  max-width: 32em;
  margin-bottom: 48px;
}

.hero-visual {
  display: block;
}

/* 対応領域タグ */
.hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 40px;
}
.hero-tags span {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.15em;
  border: 1px solid var(--c-gray-300);
  color: var(--c-gray-600);
  padding: 4px 14px;
}

/* ============================================================
   Vision
   ============================================================ */
.vision {
  background: var(--c-black);
  color: var(--c-white);
}
.vision .section-label { color: var(--c-gray-300); }
.vision .section-label::after { background: var(--c-white); }

.vision-copy {
  font-size: clamp(1.6rem, 3.5vw, 2.6rem);
  font-weight: 300;
  line-height: 1.8;
  letter-spacing: 0.06em;
  margin-bottom: 40px;
}

.vision-text {
  color: var(--c-gray-300);
  max-width: 40em;
}

/* ============================================================
   Service
   ============================================================ */
.service-card {
  border: 1px solid var(--c-gray-300);
  padding: 48px 32px;
  height: 100%;
  background: var(--c-white);
  transition: transform 0.4s var(--ease-out), box-shadow 0.4s var(--ease-out), border-color 0.4s var(--ease-out);
}
.service-card:hover {
  transform: translateY(-8px);
  border-color: var(--c-black);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.06);
}

.service-card .num {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.2em;
  color: var(--c-gray-600);
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
}

.service-card h3 {
  font-size: 1.2rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  margin-bottom: 16px;
}

.service-card p {
  font-size: 0.9rem;
  color: var(--c-gray-600);
  margin-bottom: 0;
}

/* 主軸サービス: 反転して強調 */
.service-card--main {
  background: var(--c-black);
  border-color: var(--c-black);
  color: var(--c-white);
}
.service-card--main .num { color: var(--c-gray-300); }
.service-card--main p { color: var(--c-gray-300); }
.service-card--main:hover {
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2);
}

.card-badge {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.2em;
  border: 1px solid currentColor;
  padding: 2px 10px;
}

/* ============================================================
   Products (自社アプリ)
   ============================================================ */
.products { background: var(--c-gray-100); }

.product-card {
  background: var(--c-white);
  border: 1px solid var(--c-gray-300);
  padding: 40px;
  display: flex;
  align-items: center;
  gap: 40px;
  transition: transform 0.4s var(--ease-out), box-shadow 0.4s var(--ease-out);
}
.product-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.06);
}
.product-logo {
  flex: 0 0 auto;
}
.product-logo img {
  display: block;
  width: 96px;
  height: 96px;
  border: 1px solid var(--c-gray-300);
}
.product-body h3 {
  font-size: 1.3rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  margin-bottom: 12px;
}
.product-body p {
  font-size: 0.9rem;
  color: var(--c-gray-600);
  margin-bottom: 16px;
}
.product-link {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  color: var(--c-black);
  text-decoration: none;
  border-bottom: 1px solid var(--c-black);
  padding-bottom: 2px;
  transition: opacity 0.3s ease;
}
.product-link:hover,
.product-link:focus-visible {
  color: var(--c-black);
  opacity: 0.5;
}
@media (max-width: 575.98px) {
  .product-card {
    flex-direction: column;
    align-items: flex-start;
    gap: 24px;
    padding: 32px 24px;
  }
}

/* ============================================================
   Our Customer
   ============================================================ */
.customer-logo {
  background: var(--c-white);
  border: 1px solid var(--c-gray-300);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  filter: grayscale(1);
  opacity: 0.75;
  transition: opacity 0.3s ease, transform 0.3s var(--ease-out);
}
.customer-logo:hover {
  opacity: 1;
  transform: translateY(-4px);
}

/* ============================================================
   Contact
   ============================================================ */
.contact-box {
  border: 1px solid var(--c-black);
  padding: 64px 32px;
  text-align: center;
}

.contact-mail {
  font-family: var(--font-mono);
  font-size: clamp(1rem, 3vw, 1.5rem);
  letter-spacing: 0.08em;
  color: var(--c-black);
  text-decoration: none;
  border-bottom: 1px solid var(--c-black);
  padding-bottom: 4px;
  transition: opacity 0.3s ease;
}
.contact-mail:hover,
.contact-mail:focus-visible {
  color: var(--c-black);
  opacity: 0.5;
}

/* ============================================================
   Footer
   ============================================================ */
.site-footer {
  border-top: 1px solid var(--c-gray-300);
  padding: 48px 0;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  color: var(--c-gray-600);
}

.site-footer a {
  color: var(--c-gray-600);
  text-decoration: none;
  transition: color 0.3s ease;
}
.site-footer a:hover,
.site-footer a:focus-visible {
  color: var(--c-black);
}

/* ============================================================
   Reduced motion
   ============================================================ */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
  .hero-visual, .service-card, .product-card, .customer-logo, .btn-mono {
    transition: none;
  }
}

/* ============================================================
   Responsive 微調整
   ============================================================ */
@media (max-width: 991.98px) {
  .section { padding: 80px 0; }
  .hero { min-height: auto; }
  .site-nav .navbar-collapse {
    background: var(--c-white);
    padding: 16px 0;
  }
}

/* ============================================================
   下層ページ(tabekiri/ 以下など)用
   ============================================================ */
.doc-main {
  padding: calc(var(--nav-height) + 72px) 0 96px;
}

/* 規約などの読み物は本文幅を狭くする */
.doc-narrow {
  max-width: 760px;
  margin: 0 auto;
}

.doc-body h2 {
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  margin: 48px 0 12px;
  padding-top: 24px;
  border-top: 1px solid var(--c-gray-300);
}

.doc-body p { margin-bottom: 1.2em; }

.doc-body a { color: var(--c-black); }

.doc-body ol,
.doc-body ul { padding-left: 1.6em; margin-bottom: 1.2em; }

.doc-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 32px 0;
  font-size: 0.92rem;
}
.doc-body th,
.doc-body td {
  border: 1px solid var(--c-gray-300);
  padding: 14px 16px;
  text-align: left;
  vertical-align: top;
}
.doc-body th {
  width: 32%;
  font-weight: 500;
  background: var(--c-gray-100);
}
@media (max-width: 575.98px) {
  .doc-body th,
  .doc-body td { display: block; width: 100%; }
  .doc-body th { border-bottom: none; }
}

/* 下層ページのnavbar右側リンク */
.site-nav .back-link {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.15em;
  color: var(--c-gray-600);
  text-decoration: none;
  transition: color 0.3s ease;
}
.site-nav .back-link:hover,
.site-nav .back-link:focus-visible {
  color: var(--c-black);
}

/* アプリトップ(食べきり)のヒーロー */
.app-hero {
  text-align: center;
  padding: 48px 0;
}
.app-hero .logo {
  width: 112px;
  height: 112px;
  border: 1px solid var(--c-gray-300);
  margin-bottom: 32px;
}
.app-hero h1 {
  font-size: clamp(2rem, 6vw, 3.2rem);
  font-weight: 700;
  letter-spacing: 0.04em;
  margin-bottom: 12px;
}
.app-hero .coming {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.3em;
  color: var(--c-gray-600);
  margin-bottom: 40px;
}
.app-hero .lead {
  color: var(--c-gray-600);
  max-width: 32em;
  margin: 0 auto;
}

/* 下層ページのフッタ内リンク列 */
.site-footer .footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 24px;
  margin-bottom: 20px;
}

/* 規約ページの目次 */
.doc-toc {
  border: 1px solid var(--c-gray-300);
  padding: 24px 28px;
  margin-top: 8px;
}
.doc-toc .toc-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--c-gray-600);
  margin-bottom: 12px;
}
.doc-toc ul {
  list-style: none;
  padding: 0;
  margin: 0;
  font-size: 0.85rem;
}
.doc-toc li { margin: 6px 0; }
.doc-toc a {
  color: var(--c-gray-600);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.3s ease, border-color 0.3s ease;
}
.doc-toc a:hover,
.doc-toc a:focus-visible {
  color: var(--c-black);
  border-bottom-color: var(--c-black);
}

/* Bootstrapのグレー文字をサイトのグレーに寄せる */
.doc-body .text-body-secondary { color: var(--c-gray-600) !important; }