/* ============================================
   Beta Base — 共通スタイル（BEM）
   design token（:root）＋共通骨格＋トップページ用
   ============================================ */

/* --- Design Tokens --- */
:root {
  --color-ink: #1a1a1a;
  --color-ink-soft: #3d3d3d;
  --color-text-sub: #595959; /* 白背景でコントラスト比 4.5:1 以上を担保 */
  --color-bg: #ffffff;
  --color-bg-soft: #f6f6f4;
  --color-line: #e3e3e0;
  --color-accent: #1a1a1a; /* トップは無彩色。LP側で body 修飾子から上書き */
  --color-accent-soft: #f6f6f4;
  --font-sans: "Noto Sans JP", "Hiragino Kaku Gothic ProN", system-ui, sans-serif;
  --font-serif: "Zen Old Mincho", "Hiragino Mincho ProN", "Yu Mincho", serif;
  --max-width: 1040px;
  --transition: 0.25s ease;
}

/* --- Base --- */
body {
  font-family: var(--font-sans);
  font-size: 16px;
  font-weight: 400;
  color: var(--color-ink);
  background-color: var(--color-bg);
  letter-spacing: 0.04em;
}

html {
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}

::selection {
  background-color: var(--color-ink);
  color: var(--color-bg);
}

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

/* --- Layout --- */
.l-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* --- Header --- */
.site-header {
  border-bottom: 1px solid var(--color-line);
  background-color: var(--color-bg);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px 24px;
  min-height: 72px;
  padding-top: 12px;
  padding-bottom: 12px;
}

.site-header__logo {
  font-family: var(--font-serif);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.12em;
}

.site-header__logo-mark {
  display: inline-block;
  margin-right: 8px;
  color: var(--color-accent);
}

.site-header__nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 28px;
}

.site-header__nav-link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-text-sub);
  transition: color var(--transition);
}

.site-header__nav-link:hover {
  color: var(--color-ink);
}

/* --- Footer --- */
.site-footer {
  border-top: 1px solid var(--color-line);
  padding: 40px 0;
}

.site-footer__inner {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px 24px;
}

.site-footer__logo {
  font-family: var(--font-serif);
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 0.12em;
}

.site-footer__copyright {
  font-size: 12px;
  color: var(--color-text-sub);
  letter-spacing: 0.08em;
}

/* --- Button --- */
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 52px;
  padding: 8px 48px;
  background-color: var(--color-accent);
  color: var(--color-bg);
  font-size: 15px;
  font-weight: 500;
  letter-spacing: 0.1em;
  border-radius: 2px;
  transition: opacity var(--transition);
}

.button:hover {
  opacity: 0.8;
}

.button--disabled {
  background-color: var(--color-bg-soft);
  border: 1px solid var(--color-line);
  color: var(--color-text-sub);
  cursor: default;
}

.button--disabled:hover {
  opacity: 1;
}

/* --- Section 共通 --- */
.section {
  padding: 96px 0;
}

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

.section__label {
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--color-text-sub);
}

.section__label::before {
  content: "";
  display: inline-block;
  width: 32px;
  height: 1px;
  margin-right: 12px;
  vertical-align: middle;
  background-color: var(--color-accent);
}

.section__title {
  margin: 16px 0 48px;
  font-family: var(--font-serif);
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 700;
  letter-spacing: 0.08em;
  line-height: 1.5;
}

/* ============================================
   トップページ
   ============================================ */

/* --- Hero --- */
.hero {
  padding: 128px 0 112px;
}

.hero__eyebrow {
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--color-text-sub);
  margin-bottom: 32px;
}

.hero__title {
  font-family: var(--font-serif);
  font-size: clamp(2rem, 5.2vw, 3.4rem);
  font-weight: 700;
  line-height: 1.4;
  letter-spacing: 0.06em;
}

.hero__lead {
  max-width: 34em;
  margin-top: 40px;
  font-size: 16px;
  line-height: 2.1;
  color: var(--color-ink-soft);
}

/* --- Concept --- */
.concept__text {
  max-width: 36em;
  font-size: 16px;
  line-height: 2.2;
  color: var(--color-ink-soft);
}

.concept__text + .concept__text {
  margin-top: 1.8em;
}

/* --- Projects --- */
.projects__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
}

.project-card {
  display: flex;
  flex-direction: column;
  padding: 40px 32px;
  background-color: var(--color-bg);
  border: 1px solid var(--color-line);
}

.project-card__category {
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.12em;
  color: var(--color-text-sub);
}

.project-card__title {
  margin: 16px 0 12px;
  font-family: var(--font-serif);
  font-size: 22px;
  font-weight: 700;
  letter-spacing: 0.06em;
  line-height: 1.5;
}

.project-card__desc {
  flex-grow: 1;
  font-size: 14px;
  line-height: 1.9;
  color: var(--color-ink-soft);
}

.project-card__link {
  display: inline-flex;
  align-items: center;
  align-self: flex-start;
  min-height: 44px;
  margin-top: 24px;
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.08em;
  border-bottom: 1px solid var(--color-ink);
  transition: opacity var(--transition);
}

.project-card__link:hover {
  opacity: 0.6;
}

.project-card--upcoming {
  border-style: dashed;
  background-color: transparent;
}

.project-card--upcoming .project-card__title,
.project-card--upcoming .project-card__desc {
  color: var(--color-text-sub);
}

/* --- Operator --- */
.operator__table {
  max-width: 640px;
}

.operator__row {
  display: grid;
  grid-template-columns: 160px 1fr;
  gap: 8px 24px;
  padding: 20px 0;
  border-bottom: 1px solid var(--color-line);
}

.operator__row:first-child {
  border-top: 1px solid var(--color-line);
}

.operator__row dt {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text-sub);
}

.operator__row dd {
  font-size: 15px;
  line-height: 1.9;
}

/* --- Contact --- */
.contact__lead {
  max-width: 36em;
  margin-bottom: 40px;
  font-size: 16px;
  line-height: 2.1;
  color: var(--color-ink-soft);
}

.contact__note {
  margin-top: 16px;
  font-size: 13px;
  color: var(--color-text-sub);
}

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 767px) {
  .site-header__inner {
    flex-direction: column;
    align-items: flex-start;
    padding-top: 16px;
    padding-bottom: 8px;
  }

  .site-header__nav {
    gap: 4px 20px;
  }

  .hero {
    padding: 72px 0 64px;
  }

  .hero__lead {
    margin-top: 28px;
    font-size: 15px;
  }

  .section {
    padding: 64px 0;
  }

  .section__title {
    margin-bottom: 32px;
  }

  .project-card {
    padding: 32px 24px;
  }

  .operator__row {
    grid-template-columns: 1fr;
    gap: 4px;
    padding: 16px 0;
  }

  .button {
    width: 100%;
    padding: 8px 24px;
  }
}