/* ===== BUILD UP FILM 共通スタイル（下層ページ用） ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --black: #0d1f4e;
  --white: #ffffff;
  --gray-100: #eef1f8;
  --gray-200: #d4daea;
  --gray-400: #8a9bbf;
  --gray-600: #4a5f8a;
  --gray-800: #1a2f6a;
  --teal: #15a394;
  --accent: #F5A623;
  --font: 'Helvetica Neue', 'Arial', 'Hiragino Kaku Gothic ProN', 'Hiragino Sans', 'Meiryo', sans-serif;
}

html { scroll-behavior: smooth; overflow-x: hidden; }
body { font-family: var(--font); background: var(--white); color: var(--black); line-height: 1.85; }

a { color: var(--teal); }

/* NAV */
nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  display: flex; justify-content: space-between; align-items: center;
  padding: 16px 40px; background: rgba(13,31,78,0.95); backdrop-filter: blur(12px);
}
.logo { color: var(--white); font-size: 18px; font-weight: 700; letter-spacing: 0.12em; text-decoration: none; }
.logo span { color: var(--gray-400); }
.nav-links { display: flex; gap: 26px; list-style: none; align-items: center; }
.nav-links a { color: var(--gray-400); text-decoration: none; font-size: 13px; transition: color .2s; }
.nav-links a:hover { color: var(--white); }
.nav-cta { color: #fff !important; border: 1px solid rgba(255,255,255,.3); padding: 8px 18px; border-radius: 2px; }
.nav-cta:hover { background: #fff; color: var(--black) !important; }

/* HERO */
.page-hero { background: var(--black); color: var(--white); padding: 140px 24px 70px; text-align: center; }
.page-hero .label { font-size: 11px; letter-spacing: .2em; text-transform: uppercase; color: var(--gray-400); margin-bottom: 14px; }
.page-hero h1 { font-size: clamp(28px, 4.5vw, 46px); font-weight: 800; letter-spacing: -.02em; line-height: 1.3; margin-bottom: 18px; }
.page-hero h1 em { font-style: normal; color: var(--teal); }
.page-hero p { color: var(--gray-400); font-size: 15px; max-width: 640px; margin: 0 auto; }

/* SECTIONS */
.section { padding: 70px 24px; }
.section.alt { background: var(--gray-100); }
.wrap { max-width: 860px; margin: 0 auto; }
.section h2 { font-size: clamp(22px, 3vw, 32px); font-weight: 800; letter-spacing: -.01em; margin-bottom: 24px; line-height: 1.4; }
.section h2 .bar { color: var(--teal); }
.section h3 { font-size: 19px; font-weight: 700; margin: 28px 0 10px; }
.section p { color: var(--gray-600); margin-bottom: 16px; }
.section ul { color: var(--gray-600); margin: 0 0 16px 1.2em; }
.section li { margin-bottom: 8px; }

/* feature cards */
.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; margin-top: 16px; }
.card { background: var(--white); border: 1px solid var(--gray-200); border-radius: 8px; padding: 26px 22px; }
.card .num { font-size: 13px; font-weight: 700; color: var(--teal); letter-spacing: .1em; }
.card h3 { margin: 8px 0 8px; font-size: 17px; }
.card p { font-size: 14px; margin: 0; }

/* FAQ accordion */
.faq-item { border-bottom: 1px solid var(--gray-200); }
.faq-q { width: 100%; text-align: left; background: none; border: 0; cursor: pointer;
  font-family: inherit; font-size: 16px; font-weight: 700; color: var(--black);
  padding: 20px 40px 20px 0; position: relative; }
.faq-q::after { content: '+'; position: absolute; right: 6px; top: 50%; transform: translateY(-50%);
  font-size: 22px; color: var(--teal); transition: transform .2s; }
.faq-item.open .faq-q::after { content: '−'; }
.faq-a { display: none; padding: 0 0 20px; color: var(--gray-600); }
.faq-item.open .faq-a { display: block; }

/* CTA */
.cta { background: var(--black); color: var(--white); text-align: center; padding: 70px 24px; }
.cta h2 { font-size: clamp(22px, 3vw, 32px); font-weight: 800; margin-bottom: 14px; color: #fff; }
.cta p { color: var(--gray-400); margin-bottom: 30px; }
.btn-row { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }
.btn-line { display: inline-flex; align-items: center; gap: 8px; background: #06C755; color: #fff; padding: 14px 30px; border-radius: 100px; font-weight: 700; text-decoration: none; }
.btn-line svg { width: 20px; height: 20px; }
.btn-white { background: #fff; color: var(--black); padding: 14px 30px; border-radius: 100px; font-weight: 700; text-decoration: none; }
.btn-outline { border: 1px solid rgba(255,255,255,.4); color: #fff; padding: 14px 30px; border-radius: 100px; font-weight: 700; text-decoration: none; }

/* breadcrumb */
.crumb { max-width: 860px; margin: 0 auto; padding: 14px 24px 0; font-size: 12px; color: var(--gray-400); }
.crumb a { color: var(--gray-600); text-decoration: none; }

/* blog list */
.post-list { list-style: none; margin: 0; }
.post-list li { border-bottom: 1px solid var(--gray-200); }
.post-list a { display: block; padding: 22px 0; text-decoration: none; color: var(--black); }
.post-list a:hover .post-title { color: var(--teal); }
.post-date { font-size: 12px; color: var(--gray-400); }
.post-title { font-size: 18px; font-weight: 700; margin-top: 6px; }

/* article */
.article { max-width: 760px; margin: 0 auto; }
.article p { margin-bottom: 18px; line-height: 2; }
.article h2 { margin-top: 40px; }

footer { background: var(--black); color: var(--gray-400); text-align: center; padding: 30px 24px; font-size: 13px; }
footer a { color: var(--gray-400); }

@media (max-width: 760px) {
  nav { padding: 14px 18px; }
  .nav-links { display: none; }
  .page-hero { padding: 110px 18px 50px; }
  .section { padding: 50px 18px; }
  .cards { grid-template-columns: 1fr; }
}