/* ==========================================================================
   株式会社スリースクエア コーポレートサイト 共通スタイル
   ========================================================================== */

:root {
  /* Color tokens — 寒色グレーベース + 深い紺 + マスタードの差し色 */
  --color-bg: #FFFFFF;           /* ピュアホワイト */
  --color-bg-alt: #EFF2F6;       /* 淡ブルーグレー */
  --color-ink: #0F1A2E;          /* 本文（深い紺） */
  --color-ink-2: #2C3D5A;        /* 副本文 */
  --color-ink-3: #6B7280;        /* キャプション */
  --color-rule: #C9D2DC;         /* 罫線（寒色寄り） */
  --color-rule-soft: #DEE4EC;
  --color-accent: #1F4F8B;       /* アクセント紺 */
  --color-accent-hover: #163963;
  --color-accent-2: #C8932E;     /* 差し色（ゴールド寄りマスタード） */

  /* Type */
  --font-jp: "Noto Sans JP", "Hiragino Kaku Gothic ProN", "Yu Gothic", sans-serif;
  --font-en: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;

  /* Layout */
  --content-max: 1080px;
  --content-narrow: 760px;
  --gutter: 32px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--color-bg);
  color: var(--color-ink);
  font-family: var(--font-jp);
  font-size: 16px;
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  font-feature-settings: "palt" 1;
}

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color 0.15s ease;
}
a:hover { color: var(--color-accent-hover); }

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

/* ---------- Header ---------- */
.site-header {
  border-bottom: 1px solid var(--color-rule-soft);
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: saturate(140%) blur(8px);
  background: rgba(250, 250, 247, 0.92);
}
.site-header__inner {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 18px var(--gutter);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--color-ink);
  font-weight: 500;
}
.brand__mark {
  display: inline-grid;
  grid-template-columns: repeat(3, 9px);
  grid-template-rows: repeat(3, 9px);
  gap: 3px;
}
.brand__mark span {
  width: 9px;
  height: 9px;
  background: var(--color-rule);
  display: block;
}
.brand__mark span:nth-child(1) { background: var(--color-accent); }
.brand__mark span:nth-child(5) { background: #5B7CA8; }
.brand__mark span:nth-child(9) { background: #A6B7CC; }
.brand__name {
  font-size: 15px;
  letter-spacing: 0.04em;
}
.brand__name-en {
  font-family: var(--font-en);
  font-size: 11px;
  color: var(--color-ink-3);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  margin-top: 2px;
}
.site-header__nav {
  display: flex;
  gap: 28px;
  font-size: 13.5px;
}
.site-header__nav a {
  color: var(--color-ink-2);
}
.site-header__nav a:hover { color: var(--color-accent); }

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--color-rule-soft);
  background: var(--color-bg-alt);
  margin-top: 80px;
  padding: 48px var(--gutter) 40px;
}
.site-footer__inner {
  max-width: var(--content-max);
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  gap: 24px 48px;
  justify-content: space-between;
  align-items: flex-start;
}
.site-footer__brand {
  font-size: 14px;
  color: var(--color-ink-2);
}
.site-footer__brand-name {
  font-weight: 500;
  color: var(--color-ink);
  font-size: 15px;
  margin-bottom: 8px;
}
.site-footer__nav {
  display: flex;
  gap: 28px;
  font-size: 13.5px;
}
.site-footer__nav a { color: var(--color-ink-2); }
.site-footer__copy {
  width: 100%;
  margin-top: 32px;
  padding-top: 20px;
  border-top: 1px solid var(--color-rule);
  font-family: var(--font-en);
  font-size: 12px;
  color: var(--color-ink-3);
  letter-spacing: 0.04em;
}

/* ---------- Generic page wrappers ---------- */
.page {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}
.page__main { flex: 1; }

.section {
  padding: 88px var(--gutter);
}
.section__inner {
  max-width: var(--content-max);
  margin: 0 auto;
}
.section--narrow .section__inner {
  max-width: var(--content-narrow);
}
.section--alt {
  background: var(--color-bg-alt);
  border-top: 1px solid var(--color-rule-soft);
  border-bottom: 1px solid var(--color-rule-soft);
}

.section-eyebrow {
  font-family: var(--font-en);
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--color-accent-2);
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 12px;
}
.section-eyebrow::before {
  content: "";
  width: 24px;
  height: 1px;
  background: var(--color-accent-2);
}
.section-title {
  font-size: 28px;
  font-weight: 500;
  letter-spacing: 0.04em;
  margin: 0 0 40px;
  line-height: 1.4;
}

/* ---------- Hero ---------- */
.hero {
  padding: 120px var(--gutter) 110px;
  border-bottom: 1px solid var(--color-rule-soft);
  position: relative;
  overflow: hidden;
}
.hero__inner {
  max-width: var(--content-max);
  margin: 0 auto;
  position: relative;
}
.hero__company {
  font-family: var(--font-en);
  font-size: 12px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-ink-3);
  margin-bottom: 28px;
  display: flex;
  align-items: center;
  gap: 14px;
}
.hero__company::before {
  content: "";
  width: 32px;
  height: 1px;
  background: var(--color-ink-3);
}
.hero__name-jp {
  font-size: 22px;
  font-weight: 500;
  letter-spacing: 0.05em;
  color: var(--color-ink);
  margin-bottom: 56px;
}
.hero__catch {
  font-size: clamp(32px, 5vw, 52px);
  font-weight: 500;
  line-height: 1.45;
  letter-spacing: 0.02em;
  color: var(--color-ink);
  margin: 0 0 32px;
  max-width: 18ch;
  text-wrap: balance;
}
.hero__catch-en {
  font-family: var(--font-en);
  font-size: 14px;
  color: var(--color-ink-3);
  letter-spacing: 0.06em;
  font-style: italic;
  font-weight: 400;
}
.hero__decoration {
  position: absolute;
  right: var(--gutter);
  top: 0;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: repeat(3, 1fr);
  gap: 4px;
  width: 144px;
  height: 144px;
  opacity: 0.5;
}
.hero__decoration span {
  background: var(--color-rule);
}
.hero__decoration span:nth-child(1),
.hero__decoration span:nth-child(5),
.hero__decoration span:nth-child(9) { background: var(--color-accent); opacity: 0.7; }

/* ---------- About / Profile table ---------- */
.profile {
  width: 100%;
  border-collapse: collapse;
  font-size: 14.5px;
}
.profile tr {
  border-bottom: 1px solid var(--color-rule-soft);
}
.profile tr:first-child {
  border-top: 1px solid var(--color-rule);
}
.profile tr:last-child {
  border-bottom: 1px solid var(--color-rule);
}
.profile th {
  width: 200px;
  padding: 22px 24px 22px 0;
  text-align: left;
  vertical-align: top;
  font-weight: 500;
  color: var(--color-ink-2);
  letter-spacing: 0.04em;
}
.profile td {
  padding: 22px 0;
  vertical-align: top;
  color: var(--color-ink);
  line-height: 1.7;
}

/* ---------- Service block ---------- */
.service-card {
  border: 1px solid var(--color-rule);
  background: var(--color-bg);
  padding: 48px;
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 48px;
  align-items: start;
}
.service-card__mark {
  font-family: var(--font-en);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-ink-3);
  border-top: 2px solid var(--color-ink);
  padding-top: 14px;
}
.service-card__name {
  font-size: 26px;
  font-weight: 500;
  letter-spacing: 0.06em;
  margin: 0 0 8px;
  color: var(--color-ink);
}
.service-card__name-en {
  font-family: var(--font-en);
  font-size: 13px;
  color: var(--color-ink-3);
  letter-spacing: 0.1em;
  margin-bottom: 22px;
}
.service-card__desc {
  font-size: 15px;
  line-height: 1.95;
  color: var(--color-ink-2);
  margin: 0 0 28px;
}
.service-card__cta {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  color: var(--color-accent);
  border-bottom: 1px solid var(--color-accent);
  padding-bottom: 4px;
  letter-spacing: 0.04em;
  transition: gap 0.18s ease;
}
.service-card__cta:hover { gap: 14px; }
.service-card__cta-arrow {
  font-family: var(--font-en);
}

/* ---------- Legal pages (privacy / terms) ---------- */
.legal-header {
  padding: 80px var(--gutter) 56px;
  border-bottom: 1px solid var(--color-rule-soft);
  background: var(--color-bg);
}
.legal-header__inner {
  max-width: var(--content-narrow);
  margin: 0 auto;
}
.legal-header__crumb {
  font-family: var(--font-en);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-ink-3);
  margin-bottom: 16px;
}
.legal-header__crumb a { color: var(--color-ink-3); }
.legal-header__crumb a:hover { color: var(--color-accent); }
.legal-header__title {
  font-size: 32px;
  font-weight: 500;
  letter-spacing: 0.06em;
  margin: 0 0 8px;
}
.legal-header__title-en {
  font-family: var(--font-en);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--color-ink-3);
  text-transform: uppercase;
}

.legal-body {
  padding: 64px var(--gutter) 48px;
}
.legal-body__inner {
  max-width: var(--content-narrow);
  margin: 0 auto;
}
.legal-lead {
  font-size: 15px;
  line-height: 2;
  color: var(--color-ink-2);
  margin: 0 0 56px;
  padding-bottom: 32px;
  border-bottom: 1px solid var(--color-rule-soft);
}
.legal-section {
  margin-bottom: 44px;
}
.legal-section__title {
  font-size: 16px;
  font-weight: 500;
  letter-spacing: 0.04em;
  margin: 0 0 16px;
  padding-left: 14px;
  border-left: 3px solid var(--color-accent);
  line-height: 1.5;
}
.legal-section__body {
  font-size: 14.5px;
  line-height: 2;
  color: var(--color-ink);
}
.legal-section__body p { margin: 0 0 14px; }
.legal-section__body p:last-child { margin-bottom: 0; }
.legal-section__body ul,
.legal-section__body ol {
  margin: 0 0 14px;
  padding-left: 22px;
}
.legal-section__body li {
  margin-bottom: 6px;
}
.legal-section__body ol li::marker {
  color: var(--color-ink-3);
}

.legal-footer-meta {
  margin-top: 64px;
  padding-top: 28px;
  border-top: 1px solid var(--color-rule);
  font-size: 13px;
  color: var(--color-ink-3);
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.legal-footer-meta strong {
  color: var(--color-ink-2);
  font-weight: 500;
}

/* ---------- Responsive ---------- */
@media (max-width: 720px) {
  :root { --gutter: 20px; }
  .site-header__inner { padding: 14px var(--gutter); }
  .site-header__nav { gap: 18px; font-size: 13px; }
  .brand__name { font-size: 14px; }
  .hero { padding: 72px var(--gutter) 64px; }
  .hero__decoration { width: 96px; height: 96px; opacity: 0.35; }
  .hero__name-jp { margin-bottom: 36px; font-size: 18px; }
  .section { padding: 64px var(--gutter); }
  .section-title { font-size: 22px; margin-bottom: 28px; }
  .profile th {
    width: auto;
    display: block;
    padding: 16px 0 4px;
    font-size: 12.5px;
    color: var(--color-ink-3);
  }
  .profile td {
    display: block;
    padding: 0 0 16px;
    font-size: 14.5px;
  }
  .profile tr {
    display: block;
    padding: 4px 0;
  }
  .service-card {
    grid-template-columns: 1fr;
    gap: 24px;
    padding: 28px 24px;
  }
  .service-card__mark { padding-top: 10px; }
  .legal-header { padding: 56px var(--gutter) 40px; }
  .legal-header__title { font-size: 24px; }
  .legal-body { padding: 40px var(--gutter); }
  .site-footer { padding: 40px var(--gutter) 32px; }
  .site-footer__inner { flex-direction: column; }
}

/* ==========================================================================
   Hero rich enhancement
   - 右下の半円シェイプ
   - 背景に Canvas（四角ドリフトアニメ用、script.js）
   ========================================================================== */
.hero::before {
  content: '';
  position: absolute;
  right: -180px;
  bottom: -260px;
  width: 720px;
  height: 720px;
  border-radius: 50%;
  background: rgba(31, 79, 139, 0.085);
  pointer-events: none;
  z-index: 0;
  animation: heroOrbBreath 9s ease-in-out infinite;
  will-change: transform;
}

@keyframes heroOrbBreath {
  0%, 100% { transform: scale(1); }
  50%      { transform: scale(0.78); }
}

@media (prefers-reduced-motion: reduce) {
  .hero::before { animation: none; }
}
.hero__bg-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 1;
  pointer-events: none;
  display: block;
}
.hero__decoration { z-index: 2; }
.hero__inner       { z-index: 3; }

@media (max-width: 720px) {
  .hero::before {
    right: -160px;
    bottom: -200px;
    width: 480px;
    height: 480px;
  }
}

/* ==========================================================================
   Mobile menu (hamburger)
   ========================================================================== */
.site-header__toggle {
  display: none;
  background: transparent;
  border: 0;
  width: 40px;
  height: 40px;
  padding: 0;
  cursor: pointer;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 5px;
}
.site-header__toggle span {
  display: block;
  width: 22px;
  height: 1.5px;
  background: var(--color-ink);
  transition: transform 0.25s ease, opacity 0.2s ease;
}
.site-header__toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(6.5px) rotate(45deg);
}
.site-header__toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}
.site-header__toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-6.5px) rotate(-45deg);
}

@media (max-width: 720px) {
  .site-header__toggle { display: inline-flex; }
  .site-header__inner { flex-wrap: wrap; }
  .site-header__nav {
    display: none;
    flex-basis: calc(100% + 2 * var(--gutter));
    flex-direction: column;
    gap: 0;
    border-top: 1px solid var(--color-rule-soft);
    margin: 14px calc(-1 * var(--gutter)) -14px;
    padding: 4px var(--gutter);
    background: var(--color-bg);
  }
  .site-header__nav.is-open { display: flex; }
  .site-header__nav a {
    padding: 14px 0;
    border-bottom: 1px solid var(--color-rule-soft);
  }
  .site-header__nav a:last-child { border-bottom: 0; }
}

/* ==========================================================================
   Theme: Hero & Footer ダーク化（バランス版配色）
   - ヒーローとフッターを濃紺で挟む構図、本文は明るい
   ========================================================================== */
.hero {
  background: #0F1A2E;
  border-bottom: 1px solid #1F2A45;
}
.hero__company       { color: #7A8499; }
.hero__company::before { background: #5B6B85; }
.hero__name-jp       { color: #B8BFD0; }
.hero__catch         { color: #FFFFFF; }
.hero__catch-en      { color: #B8BFD0; }
.hero::before        { background: rgba(91, 155, 213, 0.14); }

.site-footer {
  background: #0F1A2E;
  border-top-color: #1F2A45;
}
.site-footer__brand       { color: #B8BFD0; }
.site-footer__brand-name  { color: #FFFFFF; }
.site-footer__brand a     { color: #B8BFD0; }
.site-footer__brand a:hover { color: #5B9BD5; }
.site-footer__nav a       { color: #B8BFD0; }
.site-footer__nav a:hover { color: #5B9BD5; }
.site-footer__copy        { color: #7A8499; border-top-color: #2D3A5A; }

/* ==========================================================================
   Intro animation — ページロード時にヒーロー要素を段階フェードイン
   ※ 取り消す場合: ここから下のブロックを全部削除すれば元通り
   ========================================================================== */
@keyframes heroFadeIn {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}
.hero__company,
.hero__name-jp,
.hero__catch,
.hero__catch-en {
  animation: heroFadeIn 0.8s ease-out both;
}
.hero__company  { animation-delay: 0.00s; }
.hero__name-jp  { animation-delay: 0.15s; }
.hero__catch    { animation-delay: 0.30s; }
.hero__catch-en { animation-delay: 0.55s; }

@media (prefers-reduced-motion: reduce) {
  .hero__company,
  .hero__name-jp,
  .hero__catch,
  .hero__catch-en {
    animation: none;
  }
}