:root {
  --color-primary: #0a4a7a;
  --color-primary-light: #1e6ba8;
  --color-accent: #2a8cb8;
  --color-text: #1a1a1a;
  --color-text-muted: #555;
  --color-bg: #ffffff;
  --color-bg-soft: #f5f8fb;
  --color-border: #d8e1ea;
  --max-width: 960px;
  --radius: 6px;
  --font-sans: -apple-system, BlinkMacSystemFont, "Helvetica Neue",
    "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Noto Sans JP",
    "Yu Gothic", Meiryo, sans-serif;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  color: var(--color-text);
  background: var(--color-bg);
}

a {
  color: var(--color-primary-light);
  text-decoration: underline;
  text-underline-offset: 2px;
}
a:hover { color: var(--color-primary); }

h1, h2, h3 {
  color: var(--color-primary);
  line-height: 1.4;
  margin-top: 2em;
  margin-bottom: 0.6em;
}
h1 { font-size: 1.85rem; }
h2 { font-size: 1.35rem; border-bottom: 1px solid var(--color-border); padding-bottom: 0.3em; }
h3 { font-size: 1.1rem; }

p { margin: 0 0 1em; }

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.25rem;
}

/* ---------- Header ---------- */
.site-header {
  border-bottom: 1px solid var(--color-border);
  background: var(--color-bg);
}
.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 1rem;
  padding-bottom: 1rem;
  gap: 1rem;
  flex-wrap: wrap;
}
.site-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-primary);
  text-decoration: none;
}
.site-nav {
  display: flex;
  gap: 1.25rem;
  flex-wrap: wrap;
}
.site-nav a {
  color: var(--color-text);
  text-decoration: none;
  font-size: 0.95rem;
}
.site-nav a:hover { color: var(--color-primary); }

/* ---------- Hero ---------- */
.hero {
  background: var(--color-bg-soft);
  padding: 3rem 0;
  text-align: center;
}
.hero h1 { margin-top: 0; }
.hero p { color: var(--color-text-muted); max-width: 38em; margin: 0.5em auto 0; }

/* ---------- Sections ---------- */
section { padding: 2.5rem 0; }
section + section { border-top: 1px solid var(--color-border); }

.card-grid {
  display: grid;
  gap: 1.25rem;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  margin-top: 1.5rem;
}
.card {
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.25rem;
  background: var(--color-bg);
}
.card h3 { margin-top: 0; }
.card p { color: var(--color-text-muted); font-size: 0.95rem; }

.company-info {
  margin-top: 1rem;
  border-collapse: collapse;
  width: 100%;
}
.company-info th,
.company-info td {
  text-align: left;
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--color-border);
  vertical-align: top;
}
.company-info th {
  width: 30%;
  background: var(--color-bg-soft);
  font-weight: 600;
  color: var(--color-primary);
}

/* ---------- Contact form ---------- */
.contact-form {
  margin-top: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.1rem;
}
.contact-form .form-row {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}
.contact-form label {
  font-weight: 600;
  color: var(--color-primary);
  font-size: 0.95rem;
}
.contact-form .req {
  display: inline-block;
  margin-left: 0.4em;
  padding: 0.05em 0.5em;
  font-size: 0.75rem;
  font-weight: 600;
  color: #fff;
  background: var(--color-accent);
  border-radius: 999px;
  vertical-align: middle;
}
.contact-form input[type="text"],
.contact-form input[type="email"],
.contact-form textarea {
  width: 100%;
  padding: 0.6rem 0.75rem;
  font: inherit;
  color: var(--color-text);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}
.contact-form input[type="text"]:focus,
.contact-form input[type="email"]:focus,
.contact-form textarea:focus {
  outline: none;
  border-color: var(--color-primary-light);
  box-shadow: 0 0 0 3px rgba(30, 107, 168, 0.18);
}
.contact-form textarea {
  resize: vertical;
  min-height: 8em;
}
.contact-form .form-actions {
  flex-direction: row;
}
.contact-form button[type="submit"] {
  appearance: none;
  display: inline-block;
  padding: 0.7rem 1.6rem;
  font: inherit;
  font-weight: 600;
  color: #fff;
  background: var(--color-primary);
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  transition: background 0.15s ease;
}
.contact-form button[type="submit"]:hover:not(:disabled) {
  background: var(--color-primary-light);
}
.contact-form button[type="submit"]:disabled {
  background: var(--color-text-muted);
  cursor: not-allowed;
}
.contact-form .hp-field {
  position: absolute;
  left: -10000px;
  top: auto;
  width: 1px;
  height: 1px;
  overflow: hidden;
}
.form-status {
  min-height: 1.5em;
  padding: 0.6em 0.9em;
  border-radius: var(--radius);
  font-size: 0.95rem;
}
.form-status:empty { padding: 0; }
.form-status.is-info {
  background: var(--color-bg-soft);
  color: var(--color-text-muted);
  border: 1px solid var(--color-border);
}
.form-status.is-ok {
  background: #e8f5ec;
  color: #1f5c2e;
  border: 1px solid #b9dbc2;
}
.form-status.is-error {
  background: #fdecec;
  color: #8a1f1f;
  border: 1px solid #f3c2c2;
}

/* ---------- Footer ---------- */
.site-footer {
  margin-top: 3rem;
  padding: 2rem 0;
  border-top: 1px solid var(--color-border);
  background: var(--color-bg-soft);
  font-size: 0.9rem;
  color: var(--color-text-muted);
}
.site-footer .container {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}
.site-footer a { color: var(--color-text-muted); }

/* ---------- Mobile ---------- */
@media (max-width: 540px) {
  h1 { font-size: 1.5rem; }
  .hero { padding: 2rem 0; }
  .company-info th { width: 38%; }
}