/* ==========================
   共通色・ベース設定
========================== */
:root {
  --color-primary: #2563eb;
  --color-primary-hover: #1d4ed8;
  --color-primary-soft: #dbeafe;
  --color-bg: #f3f4f6;
  --color-card-bg: #ffffff;
  --color-border: #e5e7eb;
  --color-text: #0f172a;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    "Noto Sans JP", sans-serif;
  background:
    radial-gradient(circle at top left, #dbeafe 0, #eff6ff 32%, #f9fafb 72%),
    var(--color-bg);
  color: var(--color-text);
  line-height: 1.7;
}

a {
  color: inherit;
  text-decoration: none;
}

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

/* コンテナ */
.container {
  width: 100%;
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 16px;
}

/* ==========================
   ヘッダー・ナビ
========================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background-color: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(229, 231, 235, 0.9);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.logo a {
  display: inline-flex;
  align-items: center;
  text-decoration: none;
}

.logo-image {
  height: 55px;      /* 全体バランス的にこのくらいがちょうどいいはず */
  width: auto;       /* 縦横比は画像にまかせる */
  display: block;
}

.logo span {
  color: var(--color-primary);
}

.nav {
  display: flex;
  align-items: center;
  gap: 18px;
  font-size: 0.9rem;
}

.nav a {
  position: relative;
  padding: 4px 0;
  color: #4b5563;
}

.nav a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -3px;
  width: 0;
  height: 2px;
  border-radius: 999px;
  background-color: var(--color-primary);
  transition: width 0.15s ease;
}

.nav a:hover::after {
  width: 100%;
}

.nav-contact {
  padding: 6px 16px;
  border-radius: 999px;
  border: 1px solid var(--color-primary);
  color: var(--color-primary);
}

.nav-contact::after {
  display: none;
}

.nav-contact:hover {
  background-color: rgba(37, 99, 235, 0.06);
}

/* ==========================
   ボタン共通
========================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.6rem 1.6rem;
  border-radius: 999px;
  border: none;
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  cursor: pointer;
  transition:
    background-color 0.15s ease,
    transform 0.1s ease,
    box-shadow 0.1s ease,
    color 0.15s ease,
    border-color 0.15s ease;
}

.btn-primary {
  background: linear-gradient(135deg, #2563eb, #0ea5e9);
  color: #ffffff;
  border: 1px solid var(--color-primary);
  box-shadow: 0 10px 24px rgba(37, 99, 235, 0.28);
}

.btn-primary:hover {
  background: linear-gradient(135deg, #1d4ed8, #0284c7);
  transform: translateY(-1px);
  box-shadow: 0 14px 30px rgba(37, 99, 235, 0.35);
}

.btn-primary:active {
  transform: translateY(0);
  box-shadow: 0 7px 16px rgba(37, 99, 235, 0.28);
}

.btn-outline {
  background-color: #ffffff;
  color: var(--color-primary);
  border: 1px solid rgba(37, 99, 235, 0.5);
}

.btn-outline:hover {
  background-color: rgba(37, 99, 235, 0.06);
  border-color: var(--color-primary);
}

.btn-large {
  padding: 0.8rem 2.4rem;
  font-size: 1rem;
}

/* ==========================
   ヒーロー
========================== */
.hero {
  padding: 72px 0 48px;
}

.hero-inner {
  display: grid;
  grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr);
  gap: 32px;
  align-items: stretch;
}

.hero-text h1 {
  font-size: 2.15rem;
  line-height: 1.45;
  margin: 0 0 0.75rem;
  letter-spacing: 0.04em;
}

.hero-text p {
  margin: 0 0 1.4rem;
  color: #4b5563;
  font-size: 0.98rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.hero-side {
  display: flex;
  align-items: stretch;
}

.hero-card {
  position: relative;
  background-color: #ffffff;
  border-radius: 20px;
  padding: 20px 18px;
  box-shadow:
    0 18px 45px rgba(15, 23, 42, 0.12),
    0 0 0 1px rgba(209, 213, 219, 0.8);
  border: 1px solid rgba(209, 213, 219, 0.9);
  font-size: 0.9rem;
  overflow: hidden;
}

.hero-card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at top right, rgba(59, 130, 246, 0.09), transparent 55%);
  pointer-events: none;
}

.hero-card h2 {
  font-size: 1rem;
  margin: 0 0 0.6rem;
}

.hero-card ul {
  margin: 0 0 0.7rem 1.1rem;
  padding: 0;
}

.hero-card li {
  margin-bottom: 0.25rem;
}

.hero-note {
  margin: 0;
  font-size: 0.85rem;
  color: #6b7280;
}

/* ==========================
   セクション共通
========================== */
.section {
  padding: 56px 0;
  background-color: #f9fafb;
}

.section-alt {
  background-color: #ffffff;
}

.section-title {
  font-size: 1.5rem;
  margin: 0 0 0.8rem;
  position: relative;
  display: inline-block;
  padding-left: 10px;
}

.section-title::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.45em;
  width: 4px;
  height: 1.1em;
  border-radius: 999px;
  background: linear-gradient(180deg, #2563eb, #22c55e);
}

.section-lead {
  margin: 0 0 1.8rem;
  color: #4b5563;
  font-size: 0.95rem;
}

/* ==========================
   カードグリッド（サービス）
========================== */
.card-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

.card {
  background-color: #ffffff;
  border-radius: 18px;
  padding: 20px 18px;
  border: 1px solid rgba(229, 231, 235, 0.95);
  box-shadow: 0 12px 32px rgba(15, 23, 42, 0.04);
  font-size: 0.9rem;
  transition:
    transform 0.15s ease,
    box-shadow 0.15s ease,
    border-color 0.15s ease,
    background-color 0.15s ease;
}

.card h3 {
  margin: 0 0 0.55rem;
  font-size: 1.05rem;
}

.card p {
  margin: 0 0 0.75rem;
  color: #4b5563;
}

.card-list {
  margin: 0;
  padding-left: 1.1rem;
  color: #374151;
}

.card:hover {
  transform: translateY(-4px);
  border-color: rgba(37, 99, 235, 0.35);
  box-shadow: 0 18px 40px rgba(15, 23, 42, 0.12);
}

/* ==========================
   強み
========================== */
.strength-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

.strength-item {
  background-color: #f9fafb;
  border-radius: 16px;
  padding: 18px 16px;
  border: 1px solid rgba(229, 231, 235, 0.9);
  font-size: 0.9rem;
  transition:
    transform 0.15s ease,
    box-shadow 0.15s ease,
    border-color 0.15s ease;
}

.strength-item h3 {
  margin: 0 0 0.4rem;
  font-size: 1rem;
}

.strength-item p {
  margin: 0;
  color: #4b5563;
}

.strength-item:hover {
  transform: translateY(-3px);
  border-color: rgba(37, 99, 235, 0.25);
  box-shadow: 0 14px 30px rgba(15, 23, 42, 0.08);
}

/* ==========================
   ご相談の流れ
========================== */
.flow-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 18px;
}

.flow-list li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 12px;
  align-items: flex-start;
  background-color: #ffffff;
  border-radius: 16px;
  padding: 14px 16px;
  border: 1px solid rgba(229, 231, 235, 0.95);
}

.step-badge {
  width: 28px;
  height: 28px;
  border-radius: 999px;
  background: linear-gradient(135deg, #2563eb, #0ea5e9);
  color: #ffffff;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 0.9rem;
  font-weight: 600;
  flex-shrink: 0;
}

.flow-list h3 {
  margin: 0 0 0.25rem;
  font-size: 1rem;
}

.flow-list p {
  margin: 0;
  font-size: 0.9rem;
  color: #4b5563;
}

/* ==========================
   エンジニア向け
========================== */
.engineer-box {
  background-color: #f9fafb;
  border-radius: 18px;
  padding: 20px 18px;
  border: 1px solid rgba(229, 231, 235, 0.95);
  font-size: 0.9rem;
}

.engineer-box p {
  margin: 0 0 0.8rem;
}

.engineer-note {
  color: #6b7280;
  font-size: 0.85rem;
}

/* ==========================
   会社概要
========================== */
.company-box {
  background-color: #ffffff;
  border-radius: 18px;
  padding: 20px 18px;
  border: 1px solid rgba(229, 231, 235, 0.95);
  font-size: 0.9rem;
}

.company-box dl {
  margin: 0;
}

.company-box .row {
  display: grid;
  grid-template-columns: 120px minmax(0, 1fr);
  gap: 10px;
  padding: 6px 0;
  border-bottom: 1px dashed #e5e7eb;
}

.company-box .row:last-child {
  border-bottom: none;
}

.company-box dt {
  font-weight: 600;
  color: #4b5563;
}

.company-box dd {
  margin: 0;
}

/* ==========================
   CTA
========================== */
.section-cta {
  background: linear-gradient(135deg, #1d4ed8, #0f766e);
  color: #ffffff;
}

.cta-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}

.section-cta h2 {
  margin: 0 0 0.4rem;
}

.section-cta p {
  margin: 0;
  font-size: 0.95rem;
  color: #e5e7eb;
}

/* ==========================
   フッター
========================== */
.site-footer {
  padding: 18px 0 24px;
  background-color: #020617;
  color: #e5e7eb;
  font-size: 0.85rem;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.footer-logo {
  margin: 0;
  font-weight: 600;
  letter-spacing: 0.08em;
}

/* ==========================
   レスポンシブ
========================== */
@media (max-width: 900px) {
  .logo-image {
    height: 45px;   /* ナビを消してるので高さだけ少しコンパクトに */
  }
  .hero-inner {
    grid-template-columns: minmax(0, 1fr);
  }

  .hero-side {
    order: -1;
  }

  .card-grid,
  .strength-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .cta-inner {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (max-width: 640px) {
  .header-inner {
    gap: 12px;
  }

  .nav {
    display: none; /* 必要になったらハンバーガーにする */
  }

  .hero {
    padding-top: 40px;
  }

  .hero-text h1 {
    font-size: 1.6rem;
  }

  .card-grid,
  .strength-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .flow-list li {
    grid-template-columns: auto minmax(0, 1fr);
  }

  .cta-inner {
    align-items: stretch;
  }

  .btn-large {
    width: 100%;
    justify-content: center;
  }

  .footer-inner {
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
  }
}