:root {
  /* ============================
     Color Palette
  ============================ */

  /* Base */
  --color-white: #ffffff;
  --color-black: #000000;

  /* Text */
  --text-main: #333333;
  --text-sub: #666666;
  --text-light: #999999;

  /* Accent Colors (ロゴ準拠) */
  --accent-blue: #4a90e2;
  --accent-blue-dark: #3a7ac4;
  --accent-green: #7bc47f;
  --accent-pink: #f48fb1;

  /* Background */
  --bg-main: #ffffff;
  --bg-light: #f8f8f8;
  --bg-blue-light: #f5faff;

  /* Border */
  --border-light: #e5e5e5;
  --border-input: #cccccc;

  /* ============================
     Typography
  ============================ */
  --font-main: "Noto Sans JP", "Helvetica Neue", Arial, sans-serif;
  --font-size-base: 16px;
  --font-size-h1: 32px;
  --font-size-h2: 24px;
  --font-size-h3: 18px;

  /* ============================
     Layout / Spacing
  ============================ */
  --container-width: 1080px;
  --section-padding: 60px;
  --radius-small: 4px;
  --radius-medium: 6px;
  --radius-large: 8px;

  /* ============================
     Shadow
  ============================ */
  --shadow-header: 0 1px 4px rgba(0, 0, 0, 0.05);
  --shadow-card-hover: 0 4px 12px rgba(0, 0, 0, 0.08);

  /* ============================
     Transition
  ============================ */
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
}

.container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 20px;
}

.site-header {
  position: sticky;
  top: 0;
  background: var(--color-white);
  box-shadow: var(--shadow-header);
  z-index: 100;
}

.header-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 70px;
}

.nav a {
  margin-left: 24px;
  color: var(--text-main);
  text-decoration: none;
  transition: var(--transition-fast);
}

.nav a:hover {
  color: var(--accent-blue);
}
section {
  padding: var(--section-padding) 0;
}

h1 {
  font-size: var(--font-size-h1);
  color: var(--text-main);
  margin-bottom: 24px;
  border-bottom: 1px solid var(--border-light);
  padding-bottom: 12px;
}

h2 {
  font-size: var(--font-size-h2);
  color: var(--text-main);
  margin-bottom: 16px;
  position: relative;
  padding-left: 12px;
}

h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 4px;
  width: 4px;
  height: 24px;
  background: var(--accent-blue);
  border-radius: 2px;
}

h3 {
  font-size: var(--font-size-h3);
  color: var(--accent-blue);
  margin-bottom: 12px;
}

.btn-primary {
  display: inline-block;
  background: var(--accent-blue);
  color: var(--color-white);
  padding: 12px 24px;
  border-radius: var(--radius-medium);
  text-decoration: none;
  transition: var(--transition-fast);
}

.btn-primary:hover {
  background: var(--accent-blue-dark);
}

.btn-secondary {
  display: inline-block;
  border: 2px solid var(--accent-blue);
  color: var(--accent-blue);
  padding: 10px 22px;
  border-radius: var(--radius-medium);
  text-decoration: none;
  transition: var(--transition-fast);
}

.btn-secondary:hover {
  background: var(--bg-blue-light);
}

.card {
  border: 1px solid var(--border-light);
  border-radius: var(--radius-large);
  padding: 24px;
  background: var(--color-white);
  transition: var(--transition-normal);
}

.card:hover {
  background: var(--bg-blue-light);
  border-color: var(--accent-blue);
}

/* ============================
   Services Section
============================ */
.services {
  padding: var(--section-padding) 0;
}

.service-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}

.service-card h2 {
  margin-bottom: 12px;
}

.service-card p {
  color: var(--text-sub);
  line-height: 1.7;
  margin-bottom: 20px;
}

/* ============================
   Responsive
============================ */
@media (max-width: 768px) {
  .hero {
    padding: 80px 0;
  }

  .hero-title {
    font-size: 28px;
  }

  .hero-sub {
    font-size: 16px;
  }

  .service-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }
}