:root {
  --color-bg: #ffffff;
  --color-bg-tint: #f3f8ff;
  --color-ink: #111111;
  --color-ink-muted: #4a4f57;
  --color-primary: #0b5fd6;
  --color-primary-dark: #08408f;
  --color-on-primary: #ffffff;
  --color-accent-light: #cfe4ff;
  --color-accent-mid: #7fb6ff;
  --color-border: #6b7280;
  --color-success: #0b5a2a;
  --color-error: #a11212;

  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 28px;
  --radius-pill: 999px;

  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 24px;
  --space-6: 32px;
  --space-7: 56px;
  --space-8: 96px;

  --font-size-base: clamp(15px, 0.9rem + 0.2vw, 17px);
  --font-size-lead: clamp(16px, 0.95rem + 0.5vw, 20px);
  --font-size-h3: clamp(18px, 1rem + 0.5vw, 22px);
  --font-size-h2: clamp(24px, 1.2rem + 1.5vw, 36px);
  --font-size-h1: clamp(26px, 1rem + 3.6vw, 52px);

  --shadow-card: 0 6px 24px rgba(11, 95, 214, 0.1);
}

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

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-ink);
  font-family: "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Noto Sans JP", Meiryo, sans-serif;
  font-size: var(--font-size-base);
  line-height: 1.8;
}

img, svg { max-width: 100%; }

a { color: var(--color-primary-dark); }

h1, h2, h3, p, ul, dl, dd { margin: 0; }
ul { padding: 0; list-style: none; }

.container {
  max-width: 1120px;
  margin-inline: auto;
  padding-inline: clamp(16px, 5vw, 40px);
}
.container--narrow { max-width: 720px; }

.skip-link {
  position: absolute;
  left: var(--space-4);
  top: -100px;
  z-index: 100;
  padding: var(--space-3) var(--space-4);
  background: var(--color-ink);
  color: #ffffff;
  border-radius: var(--radius-sm);
}
.skip-link:focus { top: var(--space-2); }

:focus-visible {
  outline: 3px solid var(--color-primary-dark);
  outline-offset: 3px;
}

/* header */
.site-header {
  position: relative;
  z-index: 10;
  background: var(--color-bg);
}
.site-header__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-3) var(--space-5);
  padding-block: var(--space-4);
}
.site-header__logo img { display: block; height: 32px; width: auto; }
.site-nav { margin-left: auto; }
.site-nav ul { display: flex; flex-wrap: wrap; gap: var(--space-2) var(--space-5); }
.site-nav a {
  display: inline-block;
  padding: var(--space-2) 0;
  color: var(--color-ink);
  text-decoration: none;
  font-weight: 700;
}
.site-nav a:hover { color: var(--color-primary); text-decoration: underline; }
@media (max-width: 639px) {
  .site-header__inner { justify-content: space-between; }
  .site-nav { order: 3; margin-left: 0; width: 100%; }
}

/* buttons */
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: var(--space-2) var(--space-6);
  border-radius: var(--radius-pill);
  font-weight: 700;
  text-decoration: none;
  border: 2px solid transparent;
  cursor: pointer;
}
.button--primary {
  background: var(--color-primary);
  color: var(--color-on-primary);
}
.button--primary:hover { background: var(--color-primary-dark); }

/* hero */
.hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(48px, 10vw, 128px);
}
.hero__deco { position: absolute; inset: 0; pointer-events: none; }
.hero__circle { position: absolute; border-radius: 50%; }
.hero__circle--1 {
  width: clamp(200px, 38vw, 520px); aspect-ratio: 1;
  right: -6%; top: -12%;
  background: var(--color-accent-light);
}
.hero__circle--2 {
  width: clamp(90px, 16vw, 220px); aspect-ratio: 1;
  right: 22%; bottom: 8%;
  background: var(--color-accent-mid);
  opacity: 0.7;
}
.hero__circle--3 {
  width: clamp(50px, 8vw, 110px); aspect-ratio: 1;
  left: 4%; bottom: 10%;
  background: var(--color-accent-light);
}
.hero__curve {
  position: absolute;
  left: 0; bottom: 0;
  width: 100%; height: 70%;
  opacity: 0.55;
}
.hero__inner { position: relative; }
.hero h1 {
  font-size: var(--font-size-h1);
  line-height: 1.4;
  letter-spacing: 0.02em;
  margin-bottom: var(--space-5);
}
.hero__lead {
  max-width: 36em;
  font-size: var(--font-size-lead);
  margin-bottom: var(--space-6);
}

/* sections */
.section { padding-block: clamp(40px, 8vw, var(--space-8)); }
.section--tint { background: var(--color-bg-tint); }
.section h2 {
  font-size: var(--font-size-h2);
  line-height: 1.4;
  margin-bottom: var(--space-6);
}
.section__lead { margin-bottom: var(--space-5); color: var(--color-ink-muted); }

.service-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 280px), 1fr));
  gap: var(--space-5);
}
.service-card {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  padding: var(--space-6);
  background: var(--color-bg);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
}
.service-card h3 { font-size: var(--font-size-h3); line-height: 1.5; }
.service-card p { color: var(--color-ink-muted); flex: 1; }
.text-link { font-weight: 700; }

.works-list { display: grid; gap: var(--space-4); }
.works-list li {
  padding: var(--space-4) var(--space-5);
  background: var(--color-bg);
  border-radius: var(--radius-md);
}

.cta-band { padding-block: var(--space-7); }
.cta-band__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4) var(--space-6);
  padding: var(--space-6);
  max-width: 1040px;
  background: var(--color-accent-light);
  border-radius: var(--radius-lg);
}
.cta-band__inner p { font-weight: 700; font-size: var(--font-size-lead); }

.company-list {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
}
.company-list dt {
  margin-top: var(--space-4);
  font-weight: 700;
  color: var(--color-ink-muted);
}
.company-list dd {
  padding-bottom: var(--space-3);
  border-bottom: 1px solid var(--color-accent-light);
  overflow-wrap: anywhere;
}
@media (min-width: 720px) {
  .company-list { grid-template-columns: 12em minmax(0, 1fr); }
  .company-list dt, .company-list dd {
    margin: 0;
    padding-block: var(--space-4);
    border-bottom: 1px solid var(--color-accent-light);
  }
}

/* form */
#inquiryForm p { margin-bottom: var(--space-4); }
#inquiryForm label { display: block; font-weight: 700; margin-bottom: var(--space-1); }
#inquiryForm input[type="text"],
#inquiryForm input[type="email"],
#inquiryForm textarea {
  display: block;
  width: 100%;
  padding: var(--space-3) var(--space-4);
  font: inherit;
  color: var(--color-ink);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}
#inquiryForm textarea { min-height: 10em; resize: vertical; }
#inquirySubmit {
  min-height: 44px;
  padding: var(--space-2) var(--space-7);
  font: inherit;
  font-weight: 700;
  color: var(--color-on-primary);
  background: var(--color-primary);
  border: 2px solid transparent;
  border-radius: var(--radius-pill);
  cursor: pointer;
}
#inquirySubmit:hover { background: var(--color-primary-dark); }
#inquirySubmit:disabled { opacity: 0.7; cursor: default; }
.inquiry-message-wrap { margin-bottom: var(--space-4); }
.inquiry-message { font-weight: 700; }
.inquiry-success { color: var(--color-success); }
.inquiry-message[class*="inquiry-error"],
.form-errors { color: var(--color-error); }
.form-errors ul { padding-left: var(--space-5); list-style: disc; margin-bottom: var(--space-4); }

/* footer */
.site-footer {
  padding-block: var(--space-6);
  text-align: center;
  border-top: 1px solid var(--color-accent-light);
}
.site-footer__links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-2) var(--space-5);
  margin-bottom: var(--space-3);
}
.site-footer__links a { color: var(--color-ink-muted); padding-block: var(--space-2); }
.site-footer__copy { color: var(--color-ink-muted); font-size: 0.85em; }

/* motion */
@media (prefers-reduced-motion: no-preference) {
  html { scroll-behavior: smooth; }
  .hero__circle--1 { animation: float 9s ease-in-out infinite; }
  .hero__circle--2 { animation: float 7s ease-in-out infinite reverse; }
  .hero__circle--3 { animation: float 8s ease-in-out infinite; }
  .button, #inquirySubmit { transition: background-color 0.2s ease; }
  @keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-14px); }
  }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation: none;
    transition: none;
    scroll-behavior: auto;
  }
}