/* ===========================
   リセット・基本設定
=========================== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --navy: #1a2e5a;
  --navy-dark: #111e3d;
  --navy-light: #2a4080;
  --accent: #c8a84b;
  --white: #ffffff;
  --gray-light: #f5f6f8;
  --gray: #e0e3ea;
  --text: #333333;
  --text-sub: #666666;
  --font: 'Helvetica Neue', Arial, 'Hiragino Kaku Gothic ProN', 'Hiragino Sans', Meiryo, sans-serif;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font);
  color: var(--text);
  background: var(--white);
  line-height: 1.7;
}

a {
  color: inherit;
  text-decoration: none;
  transition: opacity 0.2s;
}

a:hover {
  opacity: 0.7;
}

ul {
  list-style: none;
}

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

/* ===========================
   レイアウト共通
=========================== */
.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ===========================
   ヘッダー
=========================== */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--white);
  border-bottom: 1px solid var(--gray);
  box-shadow: 0 2px 8px rgba(0,0,0,0.06);
}

.header__inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
  height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.header__logo {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--navy);
  letter-spacing: 0.08em;
}

.header__nav-list {
  display: flex;
  align-items: center;
  gap: 32px;
}

.header__nav-list a {
  font-size: 0.9rem;
  color: var(--text);
  font-weight: 500;
  letter-spacing: 0.04em;
}

.header__contact-btn {
  background: var(--navy);
  color: var(--white) !important;
  padding: 8px 20px;
  border-radius: 4px;
  font-size: 0.85rem !important;
  transition: background 0.2s !important;
  opacity: 1 !important;
}

.header__contact-btn:hover {
  background: var(--navy-light) !important;
  opacity: 1 !important;
}

/* ハンバーガー */
.header__hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.header__hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--navy);
  transition: all 0.3s;
}

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

/* ===========================
   スマホメニュー
=========================== */
.sp-menu {
  display: none;
  position: fixed;
  top: 68px;
  left: 0;
  width: 100%;
  background: var(--navy);
  z-index: 99;
  transform: translateY(-100%);
  transition: transform 0.3s;
}

.sp-menu.is-open {
  transform: translateY(0);
}

.sp-menu__list a {
  display: block;
  color: var(--white);
  padding: 16px 24px;
  border-bottom: 1px solid rgba(255,255,255,0.1);
  font-size: 0.95rem;
}

/* ===========================
   メインコンテンツ
=========================== */
.main {
  padding: 48px 0 80px;
}

/* 2カラムレイアウト */
.layout {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 48px;
  align-items: start;
}

/* ===========================
   ヒーローセクション
=========================== */
.hero {
  background: linear-gradient(135deg, var(--navy) 0%, var(--navy-light) 100%);
  color: var(--white);
  padding: 64px 48px;
  border-radius: 8px;
  margin-bottom: 48px;
}

.hero__title {
  font-size: 2rem;
  font-weight: 700;
  line-height: 1.4;
  margin-bottom: 16px;
  letter-spacing: 0.04em;
}

.hero__desc {
  font-size: 0.95rem;
  opacity: 0.85;
  margin-bottom: 32px;
  line-height: 1.8;
}

/* ===========================
   セクション共通
=========================== */
.section {
  margin-bottom: 48px;
}

.section__title {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--navy);
  padding-bottom: 12px;
  border-bottom: 2px solid var(--navy);
  margin-bottom: 28px;
  letter-spacing: 0.04em;
}

/* カードグリッド */
.card-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.card {
  background: var(--gray-light);
  border-radius: 8px;
  padding: 28px 20px;
  border: 1px solid var(--gray);
  transition: box-shadow 0.2s, transform 0.2s;
}

.card:hover {
  box-shadow: 0 4px 16px rgba(26,46,90,0.12);
  transform: translateY(-2px);
}

.card__icon {
  font-size: 2rem;
  margin-bottom: 12px;
}

.card__title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--navy);
  margin-bottom: 10px;
}

.card__text {
  font-size: 0.85rem;
  color: var(--text-sub);
  line-height: 1.7;
}

/* ===========================
   ボタン
=========================== */
.btn {
  display: inline-block;
  padding: 12px 32px;
  border-radius: 4px;
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  transition: all 0.2s;
  cursor: pointer;
}

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

.btn--primary:hover {
  background: #b8943d;
  opacity: 1;
}

.btn--outline {
  border: 2px solid var(--navy);
  color: var(--navy);
  width: 100%;
  text-align: center;
}

.btn--outline:hover {
  background: var(--navy);
  color: var(--white);
  opacity: 1;
}

/* ===========================
   サイドバー
=========================== */
.sidebar {
  position: sticky;
  top: 88px;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.sidebar__block {
  background: var(--white);
  border: 1px solid var(--gray);
  border-radius: 8px;
  padding: 24px;
}

.sidebar__title {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--navy);
  padding-bottom: 10px;
  border-bottom: 2px solid var(--navy);
  margin-bottom: 16px;
  letter-spacing: 0.04em;
}

.sidebar__news li {
  padding: 10px 0;
  border-bottom: 1px solid var(--gray);
}

.sidebar__news li:last-child {
  border-bottom: none;
}

.sidebar__date {
  display: block;
  font-size: 0.75rem;
  color: var(--text-sub);
  margin-bottom: 4px;
}

.sidebar__news a {
  font-size: 0.85rem;
  color: var(--text);
  line-height: 1.5;
}

.sidebar__category li {
  border-bottom: 1px solid var(--gray);
}

.sidebar__category a {
  display: block;
  padding: 10px 0 10px 12px;
  font-size: 0.875rem;
  position: relative;
}

.sidebar__category a::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 4px;
  height: 4px;
  background: var(--navy);
  border-radius: 50%;
}

.sidebar__cta {
  background: var(--gray-light);
  text-align: center;
}

.sidebar__cta p {
  font-size: 0.85rem;
  color: var(--text-sub);
  margin-bottom: 14px;
  line-height: 1.6;
}

/* ===========================
   フッター
=========================== */
.footer {
  background: var(--navy-dark);
  color: var(--white);
}

.footer__inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}

.footer__top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  padding: 56px 0 40px;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}

.footer__logo {
  font-size: 1.2rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  margin-bottom: 8px;
}

.footer__tagline {
  font-size: 0.8rem;
  opacity: 0.6;
}

.footer__nav ul {
  display: flex;
  flex-wrap: wrap;
  gap: 24px 40px;
}

.footer__nav a {
  font-size: 0.875rem;
  opacity: 0.75;
}

.footer__nav a:hover {
  opacity: 1;
}

.footer__bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 0;
}

.footer__copy {
  font-size: 0.75rem;
  opacity: 0.5;
}

.footer__links {
  display: flex;
  gap: 24px;
}

.footer__links a {
  font-size: 0.75rem;
  opacity: 0.5;
}

.footer__links a:hover {
  opacity: 0.9;
}

/* ===========================
   レスポンシブ
=========================== */
@media (max-width: 768px) {
  .header__nav {
    display: none;
  }

  .header__hamburger {
    display: flex;
  }

  .sp-menu {
    display: block;
  }

  .layout {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: static;
  }

  .hero {
    padding: 40px 24px;
  }

  .hero__title {
    font-size: 1.5rem;
  }

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

  .footer__top {
    flex-direction: column;
    gap: 32px;
  }

  .footer__nav ul {
    flex-direction: column;
    gap: 16px;
  }

  .footer__bottom {
    flex-direction: column;
    gap: 12px;
    text-align: center;
  }
}