/* ============================================
   Stella Knowledge Storehouse
   共通スタイルシート
   ============================================ */

/* ----- CSS変数(カラーパレット) ----- */
:root {
  /* ロゴ準拠のコーポレートカラー */
  --color-navy: #012060;
  --color-navy-dark: #001545;
  --color-navy-light: #1a3a85;
  --color-gold: #FFC000;
  --color-gold-soft: #ffd454;
  --color-white: #ffffff;
  --color-gray-50: #fafbfc;
  --color-gray-100: #f3f4f7;
  --color-gray-200: #e6e8ee;
  --color-gray-300: #cfd2dc;
  --color-gray-500: #6b7280;
  --color-gray-700: #374151;
  --color-gray-900: #111827;

  /* タイポグラフィ */
  --font-display: 'Zen Kaku Gothic New', 'Hiragino Sans', 'ヒラギノ角ゴシック', 'Yu Gothic', '游ゴシック', sans-serif;
  --font-body: 'Noto Sans JP', 'Hiragino Sans', 'ヒラギノ角ゴシック', 'Yu Gothic', '游ゴシック', sans-serif;
  --font-en: 'Inter', 'Helvetica Neue', sans-serif;

  /* レイアウト */
  --max-width: 1200px;
  --header-height: 96px;
  --content-padding: 24px;

  /* 効果 */
  --shadow-sm: 0 1px 3px rgba(1, 32, 96, 0.06);
  --shadow-md: 0 4px 16px rgba(1, 32, 96, 0.08);
  --shadow-lg: 0 12px 32px rgba(1, 32, 96, 0.12);
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ----- リセット ----- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  font-weight: 400;
  color: var(--color-gray-900);
  background: var(--color-white);
  line-height: 1.8;
  letter-spacing: 0.02em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition);
}

ul, ol {
  list-style: none;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

/* ----- ユーティリティ ----- */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--content-padding);
}

.section {
  padding: 96px 0;
}

@media (max-width: 768px) {
  .section {
    padding: 64px 0;
  }
}

.section-label {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-en);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  color: var(--color-navy);
  text-transform: uppercase;
  margin-bottom: 16px;
}

.section-label::before {
  content: '';
  width: 32px;
  height: 1px;
  background: var(--color-gold);
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 600;
  color: var(--color-navy);
  line-height: 1.4;
  margin-bottom: 48px;
  letter-spacing: 0.04em;
}

.section-title .accent {
  color: var(--color-gold);
}

/* ----- ヘッダー ----- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--color-gray-200);
  height: var(--header-height);
}

.header-inner {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--content-padding);
}

.site-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.site-logo img {
  height: 60px;
  width: auto;
}

.site-nav ul {
  display: flex;
  align-items: center;
  gap: 40px;
}

.site-nav a {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-gray-700);
  position: relative;
  padding: 8px 0;
}

.site-nav a:hover,
.site-nav a.active {
  color: var(--color-navy);
}

.site-nav a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--color-gold);
  transform: scaleX(0);
  transform-origin: center;
  transition: transform var(--transition);
}

.site-nav a:hover::after,
.site-nav a.active::after {
  transform: scaleX(1);
}

.nav-toggle {
  display: none;
  width: 40px;
  height: 40px;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-navy);
  transition: var(--transition);
}

.nav-toggle.is-open span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.nav-toggle.is-open span:nth-child(2) {
  opacity: 0;
}
.nav-toggle.is-open span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

@media (max-width: 768px) {
  .site-logo img {
    height: 44px;
  }

  .nav-toggle {
    display: flex;
  }

  .site-nav {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--color-white);
    border-bottom: 1px solid var(--color-gray-200);
    transform: translateY(-100%);
    opacity: 0;
    pointer-events: none;
    transition: var(--transition);
  }

  .site-nav.is-open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .site-nav ul {
    flex-direction: column;
    gap: 0;
    padding: 16px 0;
  }

  .site-nav li {
    width: 100%;
  }

  .site-nav a {
    display: block;
    padding: 16px var(--content-padding);
    font-size: 1rem;
  }
}

/* ----- ボタン ----- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 16px 32px;
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  border-radius: 2px;
  transition: var(--transition);
  cursor: pointer;
}

.btn-primary {
  background: var(--color-navy);
  color: var(--color-white);
}

.btn-primary:hover {
  background: var(--color-navy-dark);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn-primary .arrow {
  transition: transform var(--transition);
}

.btn-primary:hover .arrow {
  transform: translateX(4px);
}

.btn-outline {
  background: transparent;
  color: var(--color-navy);
  border: 1px solid var(--color-navy);
}

.btn-outline:hover {
  background: var(--color-navy);
  color: var(--color-white);
}

/* ----- フッター ----- */
.site-footer {
  background: var(--color-navy);
  color: var(--color-white);
  padding: 64px 0 32px;
  margin-top: 96px;
}

.footer-main {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 48px;
}

.footer-brand h3 {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 500;
  margin-bottom: 16px;
  letter-spacing: 0.04em;
}

.footer-brand p {
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.7);
  line-height: 1.8;
}

.footer-section h4 {
  font-family: var(--font-en);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  color: var(--color-gold);
  text-transform: uppercase;
  margin-bottom: 20px;
}

.footer-section ul {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-section a {
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.8);
}

.footer-section a:hover {
  color: var(--color-gold);
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 32px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  font-size: 0.8rem;
  color: rgba(255, 255, 255, 0.6);
}

.footer-policies {
  display: flex;
  gap: 24px;
}

@media (max-width: 768px) {
  .footer-main {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
  }

  .footer-policies {
    flex-wrap: wrap;
    gap: 16px;
  }
}

/* ----- ページ共通:下層ページのヘッダー ----- */
.page-header {
  background: var(--color-navy);
  color: var(--color-white);
  padding: 96px 0 64px;
  position: relative;
  overflow: hidden;
}

.page-header::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image:
    linear-gradient(135deg, transparent 49.5%, rgba(255, 192, 0, 0.05) 49.5%, rgba(255, 192, 0, 0.05) 50.5%, transparent 50.5%),
    radial-gradient(circle at 80% 20%, rgba(255, 192, 0, 0.08), transparent 50%);
  pointer-events: none;
}

.page-header .container {
  position: relative;
}

.page-title-en {
  font-family: var(--font-en);
  font-size: 0.85rem;
  font-weight: 500;
  letter-spacing: 0.3em;
  color: var(--color-gold);
  text-transform: uppercase;
  margin-bottom: 16px;
}

.page-title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 500;
  letter-spacing: 0.06em;
  line-height: 1.3;
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 24px;
  font-size: 0.8rem;
  color: rgba(255, 255, 255, 0.7);
}

.breadcrumb a:hover {
  color: var(--color-gold);
}

.breadcrumb .separator {
  color: rgba(255, 255, 255, 0.4);
}

/* ----- ページ共通:本文 ----- */
.page-body {
  padding: 80px 0;
  max-width: 880px;
  margin: 0 auto;
}

.page-body h2 {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--color-navy);
  margin: 56px 0 20px;
  padding-left: 16px;
  border-left: 3px solid var(--color-gold);
  line-height: 1.5;
}

.page-body h2:first-child {
  margin-top: 0;
}

.page-body h3 {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--color-navy);
  margin: 32px 0 12px;
}

.page-body p {
  margin-bottom: 16px;
  color: var(--color-gray-700);
  line-height: 1.9;
}

.page-body ul, .page-body ol {
  margin: 16px 0 16px 24px;
}

.page-body ul li {
  position: relative;
  padding-left: 20px;
  margin-bottom: 8px;
  color: var(--color-gray-700);
  line-height: 1.9;
}

.page-body ul li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 14px;
  width: 8px;
  height: 1px;
  background: var(--color-gold);
}

.page-body ol {
  list-style: decimal;
}

.page-body ol li {
  margin-bottom: 8px;
  color: var(--color-gray-700);
  line-height: 1.9;
}

.page-body .updated {
  margin-top: 64px;
  padding-top: 32px;
  border-top: 1px solid var(--color-gray-200);
  font-size: 0.85rem;
  color: var(--color-gray-500);
  text-align: right;
}

/* ----- CTAセクション ----- */
.cta {
  background: var(--color-navy);
  color: var(--color-white);
  position: relative;
  overflow: hidden;
  padding: 96px 0;
}

.cta::before {
  content: '';
  position: absolute;
  top: -100px;
  right: -100px;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(255, 192, 0, 0.15), transparent 70%);
  pointer-events: none;
}

.cta-inner {
  position: relative;
  text-align: center;
  max-width: 720px;
  margin: 0 auto;
}

.cta-label {
  font-family: var(--font-en);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.3em;
  color: var(--color-gold);
  text-transform: uppercase;
  margin-bottom: 24px;
}

.cta-title {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3.5vw, 2.25rem);
  font-weight: 500;
  line-height: 1.6;
  letter-spacing: 0.06em;
  margin-bottom: 32px;
}

.cta-desc {
  font-size: 1rem;
  color: rgba(255, 255, 255, 0.85);
  line-height: 1.9;
  margin-bottom: 40px;
}

.cta .btn-primary {
  background: var(--color-gold);
  color: var(--color-navy);
}

.cta .btn-primary:hover {
  background: var(--color-gold-soft);
  color: var(--color-navy-dark);
}

@media (max-width: 768px) {
  .cta {
    padding: 64px 0;
  }
}