:root {
  --color-bg: #fafafa;
  --color-surface: #ffffff;
  --color-text: #1f2328;
  --color-text-muted: #6b7280;
  --color-accent: #2563eb;
  --color-accent-hover: #1d4ed8;
  --color-border: #e5e7eb;
  --max-width: 860px;
  --radius: 12px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Hiragino Kaku Gothic ProN", "Yu Gothic", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.8;
}

a {
  color: var(--color-accent);
  text-decoration: none;
}

a:hover {
  color: var(--color-accent-hover);
  text-decoration: underline;
}

img {
  max-width: 100%;
  display: block;
}

/* Header / Nav */
header {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 10;
}

.nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.5rem;
}

.site-title {
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--color-text);
}

.site-title:hover {
  text-decoration: none;
  color: var(--color-accent);
}

nav ul {
  list-style: none;
  display: flex;
  gap: 1.5rem;
  margin: 0;
  padding: 0;
}

nav a {
  color: var(--color-text-muted);
  font-weight: 500;
}

nav a:hover {
  color: var(--color-accent);
  text-decoration: none;
}

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

/* Main content */
main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 3rem 1.5rem 5rem;
}

h1 {
  font-size: 2rem;
  margin-bottom: 0.5rem;
}

h2 {
  font-size: 1.4rem;
  margin-top: 2.5rem;
  margin-bottom: 1rem;
  border-left: 4px solid var(--color-accent);
  padding-left: 0.6rem;
}

.subtitle {
  color: var(--color-text-muted);
  font-size: 1.05rem;
  margin-bottom: 2rem;
}

/* Hero */
.hero {
  display: flex;
  align-items: center;
  gap: 2rem;
  flex-wrap: wrap;
  margin-bottom: 1rem;
}

.hero img {
  width: 160px;
  height: 160px;
  border-radius: 50%;
  border: 3px solid var(--color-surface);
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
}

.hero-text {
  flex: 1;
  min-width: 220px;
}

/* Cards */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.5rem;
  margin-top: 1rem;
}

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: box-shadow 0.2s ease, transform 0.2s ease;
}

.card:hover {
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.08);
  transform: translateY(-2px);
}

.card img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
}

.card-body {
  padding: 1rem 1.2rem 1.4rem;
}

.card-body h3 {
  margin: 0 0 0.4rem;
  font-size: 1.05rem;
}

.card-body p {
  margin: 0;
  color: var(--color-text-muted);
  font-size: 0.92rem;
}

.tag {
  display: inline-block;
  background: #eef2ff;
  color: var(--color-accent);
  font-size: 0.75rem;
  padding: 0.15rem 0.6rem;
  border-radius: 999px;
  margin-bottom: 0.6rem;
}

/* Skills list */
.skill-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.skill-list li {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  padding: 0.4rem 0.9rem;
  border-radius: 999px;
  font-size: 0.9rem;
}

/* Contact */
.contact-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.contact-list li {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1rem 1.2rem;
}

.contact-icon {
  font-size: 1.3rem;
  width: 2rem;
  text-align: center;
}

.contact-label {
  display: block;
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

/* Footer */
footer {
  text-align: center;
  color: var(--color-text-muted);
  font-size: 0.85rem;
  padding: 2rem 1.5rem;
  border-top: 1px solid var(--color-border);
}