/* ===== Base ===== */
body {
  margin: 0;
  font-family: "Hiragino Kaku Gothic ProN", "Noto Sans JP", sans-serif;
  color: #1f2933;
  line-height: 1.8;
  background: #ffffff;
}

/* ===== Color Theme ===== */
:root {
  --navy: #0a2a43;
  --light-blue: #e8f1f8;
  --accent: #1c6fb8;
}

/* ===== Header ===== */
.site-header {
  position: fixed;
  top: 0;
  width: 100%;
  background: #ffffff;
  border-bottom: 1px solid #dde6ee;
  z-index: 1000;
}

.header-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 12px 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: bold;
  color: var(--navy);
}

.brand img {
  height: 36px;
}

.global-nav a {
  margin-left: 20px;
  text-decoration: none;
  color: var(--navy);
  font-weight: 500;
}

.global-nav a:hover {
  color: var(--accent);
}

/* ===== Main ===== */
main {
  padding-top: 90px;
}

.hero {
  background: var(--light-blue);
  padding: 90px 20px;
  text-align: center;
}

.hero h1 {
  font-size: 2rem;
}

.hero h1 span {
  color: var(--accent);
}

.section {
  max-width: 900px;
  margin: 60px auto;
  padding: 0 20px;
}

.section-light {
  background: #f7fafc;
  padding: 60px 20px;
}

.section h1,
.section h2 {
  color: var(--navy);
  margin-bottom: 20px;
}

.link a {
  font-weight: bold;
  color: var(--accent);
}

.contact {
  text-align: center;
}

.email {
  font-size: 1.2em;
  font-weight: bold;
  color: var(--navy);
}

/* ===== Profile ===== */
.profile-signature {
  text-align: center;
  margin: 30px 0;
}

.profile-signature img {
  max-width: 200px;
}

/* ===== Footer ===== */
.site-footer {
  background: var(--navy);
  color: #ffffff;
  padding: 30px 20px;
}

.footer-inner {
  max-width: 1100px;
  margin: 0 auto;
  text-align: center;
}

.footer-nav {
  margin-bottom: 15px;
}

.footer-nav a {
  color: #ffffff;
  margin: 0 10px;
  text-decoration: none;
  font-size: 0.9rem;
}

.footer-nav a:hover {
  text-decoration: underline;
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
  .header-inner {
    flex-direction: column;
    gap: 10px;
  }

  .global-nav a {
    margin: 0 10px;
  }
}