/* ===== 株式会社黒船 コーポレートLP ===== */
:root {
  --navy-900: #0c1a2b;
  --navy-800: #102438;
  --navy-700: #16314b;
  --steel-400: #8aa0b6;
  --steel-200: #c7d3df;
  --accent: #2e9bd6;
  --accent-strong: #1d7fb5;
  --gold: #c9a24a;
  --text: #1c2733;
  --text-light: #5a6b77;
  --bg: #ffffff;
  --bg-alt: #f4f7fa;
  --border: #e2e8ef;
  --maxw: 1080px;
  --radius: 14px;
  --shadow: 0 10px 30px rgba(12, 26, 43, 0.08);
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; scroll-padding-top: 72px; }

body {
  font-family: "Noto Sans JP", system-ui, -apple-system, "Hiragino Kaku Gothic ProN", "Meiryo", sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; height: auto; display: block; }
a { color: var(--accent-strong); text-decoration: none; }
a:hover { text-decoration: underline; }

.container { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

/* ===== ヘッダー ===== */
.site-header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  background: rgba(12, 26, 43, 0.82);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  transition: background .3s;
}
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.logo { display: flex; flex-direction: column; line-height: 1.1; }
.logo-mark {
  font-family: "Orbitron", sans-serif; font-weight: 800; letter-spacing: .12em;
  font-size: 20px; color: #fff;
}
.logo-sub { font-size: 11px; color: var(--steel-400); letter-spacing: .08em; }

.gnav { display: flex; align-items: center; gap: 28px; }
.gnav a { color: var(--steel-200); font-size: 14px; font-weight: 500; }
.gnav a:hover { color: #fff; text-decoration: none; }
.nav-cta {
  background: var(--accent); color: #fff !important;
  padding: 9px 18px; border-radius: 999px; font-weight: 700;
}
.nav-cta:hover { background: var(--accent-strong); }

.nav-toggle { display: none; flex-direction: column; gap: 5px; background: none; border: 0; cursor: pointer; padding: 8px; }
.nav-toggle span { width: 24px; height: 2px; background: #fff; transition: .3s; }

/* ===== ヒーロー ===== */
.hero { position: relative; min-height: 92vh; display: flex; align-items: center; overflow: hidden; color: #fff; }
.hero-bg {
  position: absolute; inset: 0; z-index: -1;
  background:
    radial-gradient(900px 500px at 80% -10%, rgba(46, 155, 214, 0.35), transparent 60%),
    radial-gradient(700px 500px at 0% 110%, rgba(201, 162, 74, 0.18), transparent 55%),
    linear-gradient(160deg, var(--navy-900) 0%, var(--navy-700) 100%);
}
.hero-bg::after {
  content: ""; position: absolute; inset: 0;
  background-image: linear-gradient(rgba(255,255,255,.04) 1px, transparent 1px),
                    linear-gradient(90deg, rgba(255,255,255,.04) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(circle at 50% 40%, #000 30%, transparent 75%);
}
.hero-inner { padding: 120px 24px 80px; }
.hero-eyebrow {
  display: inline-block; font-family: "Orbitron", sans-serif; letter-spacing: .2em;
  color: var(--accent); font-size: 13px; margin-bottom: 18px;
  border: 1px solid rgba(46,155,214,.4); padding: 5px 14px; border-radius: 999px;
}
.hero-title { font-size: clamp(32px, 6vw, 60px); font-weight: 700; line-height: 1.25; letter-spacing: .01em; }
.hero-lead { margin-top: 24px; font-size: clamp(15px, 2.2vw, 18px); color: var(--steel-200); }
.hero-actions { margin-top: 40px; display: flex; gap: 16px; flex-wrap: wrap; }

/* ===== ボタン ===== */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 14px 32px; border-radius: 999px; font-weight: 700; font-size: 15px;
  transition: transform .2s, background .2s, box-shadow .2s; cursor: pointer;
}
.btn:hover { text-decoration: none; transform: translateY(-2px); }
.btn-primary { background: var(--accent); color: #fff; box-shadow: 0 8px 20px rgba(46,155,214,.35); }
.btn-primary:hover { background: var(--accent-strong); }
.btn-ghost { background: rgba(255,255,255,.08); color: #fff; border: 1px solid rgba(255,255,255,.25); }
.btn-ghost:hover { background: rgba(255,255,255,.16); }
.btn-lg { padding: 18px 44px; font-size: 17px; }

/* ===== セクション共通 ===== */
.section { padding: 96px 0; }
.section-alt { background: var(--bg-alt); }
.section-eyebrow {
  font-family: "Orbitron", sans-serif; letter-spacing: .22em; font-size: 13px;
  color: var(--accent-strong); margin-bottom: 12px;
}
.section-title { font-size: clamp(24px, 4vw, 34px); font-weight: 700; line-height: 1.4; }
.section-lead { margin-top: 18px; color: var(--text-light); font-size: 16px; max-width: 720px; }

/* ===== カード ===== */
.cards { display: grid; gap: 24px; margin-top: 44px; }
.cards-3 { grid-template-columns: repeat(3, 1fr); }
.cards-4 { grid-template-columns: repeat(4, 1fr); }
.card {
  background: #fff; border: 1px solid var(--border); border-radius: var(--radius);
  padding: 28px 24px; box-shadow: var(--shadow);
  transition: transform .25s, box-shadow .25s;
}
.card:hover { transform: translateY(-4px); box-shadow: 0 16px 36px rgba(12,26,43,.12); }
.card h3 { font-size: 17px; margin-bottom: 10px; color: var(--navy-800); }
.card p { font-size: 14.5px; color: var(--text-light); }
.feature-icon { font-size: 32px; margin-bottom: 12px; }
.strength-no {
  font-family: "Orbitron", sans-serif; font-size: 30px; font-weight: 800;
  color: var(--steel-200); display: block; margin-bottom: 8px;
}

/* ===== 導入の流れ ===== */
.flow { list-style: none; margin-top: 44px; display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.flow-step { position: relative; background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 32px 22px 24px; text-align: center; }
.flow-num {
  position: absolute; top: -20px; left: 50%; transform: translateX(-50%);
  width: 44px; height: 44px; border-radius: 50%; background: var(--accent); color: #fff;
  font-family: "Orbitron", sans-serif; font-weight: 800; font-size: 18px;
  display: flex; align-items: center; justify-content: center; box-shadow: 0 6px 14px rgba(46,155,214,.4);
}
.flow-step h3 { margin: 12px 0 8px; font-size: 16px; color: var(--navy-800); }
.flow-step p { font-size: 13.5px; color: var(--text-light); }

/* ===== 会社概要 ===== */
.company-table { width: 100%; max-width: 760px; margin-top: 36px; border-collapse: collapse; }
.company-table th, .company-table td { text-align: left; padding: 18px 16px; border-bottom: 1px solid var(--border); vertical-align: top; }
.company-table th { width: 30%; color: var(--navy-800); font-weight: 700; background: var(--bg-alt); white-space: nowrap; }
.company-table td { color: var(--text); }

/* ===== お問い合わせ ===== */
.contact { background: linear-gradient(160deg, var(--navy-900), var(--navy-700)); color: #fff; text-align: center; }
.contact .section-title { color: #fff; }
.contact .section-lead { color: var(--steel-200); margin: 18px auto 36px; }
.contact-inner { display: flex; flex-direction: column; align-items: center; }

/* ===== フッター ===== */
.site-footer { background: var(--navy-900); color: var(--steel-200); padding: 48px 0 32px; }
.footer-inner { display: flex; flex-direction: column; gap: 16px; }
.footer-brand .logo-mark { font-size: 18px; }
.footer-brand p { font-size: 14px; margin-top: 4px; }
.footer-addr { color: var(--steel-400); font-size: 13px; }
.copyright { font-size: 12px; color: var(--steel-400); border-top: 1px solid rgba(255,255,255,.08); padding-top: 20px; margin-top: 8px; }

.sp-only { display: none; }

/* ===== レスポンシブ ===== */
@media (max-width: 900px) {
  .cards-4 { grid-template-columns: repeat(2, 1fr); }
  .flow { grid-template-columns: repeat(2, 1fr); row-gap: 36px; }
}
@media (max-width: 720px) {
  .sp-only { display: inline; }
  .nav-toggle { display: flex; }
  .gnav {
    position: fixed; top: 64px; right: 0; left: 0;
    flex-direction: column; gap: 0; align-items: stretch;
    background: var(--navy-800); border-top: 1px solid rgba(255,255,255,.08);
    max-height: 0; overflow: hidden; transition: max-height .3s ease;
  }
  .gnav.open { max-height: 420px; }
  .gnav a { padding: 16px 24px; border-bottom: 1px solid rgba(255,255,255,.06); }
  .nav-cta { border-radius: 0; text-align: center; }
  .cards-3, .cards-4 { grid-template-columns: 1fr; }
  .flow { grid-template-columns: 1fr; }
  .section { padding: 72px 0; }
  .hero-actions .btn { flex: 1; }
}