/* =============================================================
   bistart-brand.css — BIスターターパック ブランド統一
   ============================================================= */

body {
  background: #f5f7fb;
}

.site-header {
  box-shadow: 0 8px 30px -24px rgba(13,27,75,.45);
}

.hero {
  min-height: 670px;
  padding-top: 128px;
  padding-bottom: 76px;
  background:
    radial-gradient(720px 420px at 94% 8%, rgba(79,195,247,.24), transparent 70%),
    radial-gradient(520px 300px at 4% 100%, rgba(244,200,67,.12), transparent 70%),
    linear-gradient(135deg, #081537, #0D1B4B 48%, #17437E);
}

.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  opacity: .3;
  background-image:
    linear-gradient(rgba(79,195,247,.08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(79,195,247,.08) 1px, transparent 1px);
  background-size: 44px 44px;
  pointer-events: none;
}

.hero-inner {
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1.02fr) minmax(360px, .98fr);
  gap: clamp(2rem, 5vw, 5rem);
  align-items: center;
}

.hero-copy {
  position: relative;
  z-index: 1;
}

.hero-visual {
  position: relative;
  z-index: 1;
}

.hero-visual img {
  width: 100%;
  height: 410px;
  object-fit: cover;
  border-radius: 26px;
  border: 1px solid rgba(255,255,255,.18);
  box-shadow: 0 36px 80px -38px rgba(0,0,0,.9);
}

.hero-visual::after {
  content: "社外IT・AIパートナー";
  position: absolute;
  right: -14px;
  bottom: 24px;
  padding: .85rem 1.1rem;
  border-right: 4px solid var(--gold);
  border-radius: 10px 0 0 10px;
  background: rgba(8,21,55,.92);
  color: #fff;
  font-size: .85rem;
  font-weight: 700;
  letter-spacing: .06em;
}

.hero-price {
  box-shadow: inset 0 0 0 1px rgba(244,200,67,.12);
}

.brand-strip {
  position: relative;
  z-index: 2;
  margin-top: -36px;
}

.brand-strip__inner {
  max-width: 920px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(3,1fr);
  overflow: hidden;
  border: 1px solid rgba(13,27,75,.08);
  border-radius: 18px;
  background: #fff;
  box-shadow: 0 26px 60px -38px rgba(13,27,75,.75);
}

.brand-strip__item {
  padding: 1.15rem 1.3rem;
  text-align: center;
}

.brand-strip__item + .brand-strip__item {
  border-left: 1px solid rgba(13,27,75,.08);
}

.brand-strip__item strong {
  display: block;
  color: #0E4FA3;
  font-size: .95rem;
}

.brand-strip__item span {
  color: var(--slate);
  font-size: .78rem;
}

.issues,
.steps,
.upgrade {
  background: #f5f7fb;
}

.issue-item,
.service-item,
.upgrade-card,
.price-card {
  border-color: rgba(13,27,75,.08);
  box-shadow: 0 18px 44px -36px rgba(13,27,75,.75);
}

.issue-item {
  position: relative;
  overflow: hidden;
}

.issue-item::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 56px;
  height: 3px;
  background: var(--gold);
}

.report,
.goal,
.cta-section {
  background:
    radial-gradient(560px 260px at 90% 0%, rgba(79,195,247,.15), transparent 70%),
    linear-gradient(135deg, #081537, #0D1B4B 60%, #17437E);
}

.report-card,
.goal-item {
  background: rgba(255,255,255,.055);
  border-color: rgba(79,195,247,.18);
}

.price-card {
  border-width: 1px;
  border-top: 5px solid var(--gold);
}

.site-footer {
  background: #081537;
  border-top-color: rgba(79,195,247,.16);
  color: rgba(255,255,255,.62);
}

@media (max-width: 860px) {
  .hero-inner {
    grid-template-columns: 1fr;
  }

  .hero-visual {
    max-width: 650px;
  }

  .brand-strip__inner {
    width: calc(100% - 40px);
  }
}

@media (max-width: 600px) {
  .hero {
    min-height: auto;
    padding-top: 108px;
  }

  .hero-visual img {
    height: 270px;
    border-radius: 18px;
  }

  .hero-visual::after {
    right: -6px;
    font-size: .72rem;
  }

  .brand-strip__inner {
    grid-template-columns: 1fr;
  }

  .brand-strip__item + .brand-strip__item {
    border-left: 0;
    border-top: 1px solid rgba(13,27,75,.08);
  }
}

@media (max-width: 760px) {
  .site-header nav a:not(:last-child) { display: none; }
  .site-header nav { gap: 0 !important; }
}