/* iigtn site shared styles
   Used by index.html / about.html / skills.html / works.html / contact.html */

:root {
  --c-bg: #fafafa;
  --c-surface: #ffffff;
  --c-text: #1a1a1a;
  --c-muted: #666;
  --c-border: #e5e5e5;
  --c-accent: #2a6acc;
  --c-accent-dark: #1f4d99;
  --c-accent-light: #e3f2fd;
  --c-good: #2a8a2a;
  --max-width: 960px;
  --gutter: 1.2rem;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Sans", "Noto Sans JP", system-ui, sans-serif;
  line-height: 1.7;
  color: var(--c-text);
  margin: 0;
  background: var(--c-bg);
  -webkit-font-smoothing: antialiased;
}
a { color: var(--c-accent); text-decoration: none; }
a:hover { text-decoration: underline; }
h1, h2, h3 { letter-spacing: 0.02em; }
code {
  background: #f0f0f0;
  padding: 1px 6px;
  border-radius: 3px;
  font-size: 0.88em;
  font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
}

/* ── Header / Nav ──────────────────────────── */
.site-header {
  position: sticky; top: 0;
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--c-border);
  z-index: 100;
}
.nav {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0.7rem var(--gutter);
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav .logo {
  display: inline-flex;
  align-items: center;
  color: var(--c-text);
  line-height: 0;
}
.nav .logo img {
  height: 32px;
  width: auto;
  display: block;
}
.nav ul {
  display: flex;
  gap: 1.4rem;
  list-style: none;
  margin: 0; padding: 0;
  font-size: 0.92rem;
}
.nav ul a {
  color: var(--c-text);
  font-weight: 500;
  padding: 0.2rem 0;
  border-bottom: 2px solid transparent;
  transition: border-color 0.15s, color 0.15s;
}
.nav ul a:hover { color: var(--c-accent); text-decoration: none; }
.nav ul a.active {
  color: var(--c-accent);
  border-bottom-color: var(--c-accent);
}
@media (max-width: 700px) {
  .nav ul { gap: 0.8rem; font-size: 0.82rem; flex-wrap: wrap; justify-content: flex-end; }
  .nav .logo img { height: 26px; }
}

/* ── Sections common ─────────────────────────── */
section, .page-section {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 4rem var(--gutter) 3rem;
}
section h2, .page-section h2 {
  font-size: 1.6rem;
  margin: 0 0 0.4rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
section h2::after, .page-section h2::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--c-border);
}
section .lead, .page-section .lead {
  color: var(--c-muted);
  margin: 0 0 2rem;
  font-size: 0.95rem;
}

/* Page header used by individual pages (about / skills / works / contact) */
.page-header {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 3rem var(--gutter) 1rem;
}
.page-header h1 {
  font-size: clamp(1.7rem, 3.5vw, 2.2rem);
  margin: 0 0 0.5rem;
}
.page-header .lead {
  color: var(--c-muted);
  margin: 0 0 0;
  font-size: 1rem;
  max-width: 720px;
}

/* ── Hero ─────────────────────────────────────── */
.hero {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 5rem var(--gutter) 4rem;
  text-align: left;
}
.hero-monogram {
  width: 90px; height: 90px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--c-accent) 0%, var(--c-accent-dark) 100%);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.2rem;
  font-weight: 700;
  letter-spacing: 0;
  margin-bottom: 1.6rem;
  box-shadow: 0 8px 24px rgba(42,106,204,0.25);
}
.hero h1 {
  font-size: clamp(1.9rem, 4vw, 2.6rem);
  margin: 0 0 0.6rem;
  line-height: 1.25;
}
.hero h1 .accent { color: var(--c-accent); }
.hero .tagline {
  font-size: 1.05rem;
  color: var(--c-muted);
  margin: 0 0 2rem;
  max-width: 580px;
}
.hero-cta {
  display: flex;
  gap: 0.8rem;
  flex-wrap: wrap;
}
.btn {
  display: inline-block;
  padding: 0.7rem 1.4rem;
  border-radius: 6px;
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  transition: transform 0.1s, box-shadow 0.2s;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn-primary { background: var(--c-accent); color: white; }
.btn-primary:hover { background: var(--c-accent-dark); box-shadow: 0 4px 12px rgba(42,106,204,0.3); }
.btn-ghost {
  background: transparent;
  color: var(--c-text);
  border: 1px solid var(--c-border);
}
.btn-ghost:hover { background: var(--c-surface); border-color: var(--c-accent); }

/* ── Top page summary cards ──────────────────── */
.summary-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.2rem;
}
.summary-card {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: 8px;
  padding: 1.5rem 1.6rem;
  transition: border-color 0.2s, box-shadow 0.2s, transform 0.1s;
}
.summary-card:hover {
  border-color: var(--c-accent);
  box-shadow: 0 6px 18px rgba(42,106,204,0.12);
  transform: translateY(-2px);
}
a.summary-card-link {
  display: block;
  color: inherit;
  text-decoration: none;
}
a.summary-card-link:hover { text-decoration: none; }
.summary-card h3 {
  margin: 0 0 0.4rem;
  font-size: 1.1rem;
  color: var(--c-text);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
a.summary-card-link:hover .summary-card h3 { color: var(--c-accent); }
.summary-card p {
  margin: 0 0 0.8rem;
  color: var(--c-muted);
  font-size: 0.92rem;
}
.summary-card .more {
  font-size: 0.88rem;
  color: var(--c-accent);
  font-weight: 600;
}

/* ── About ────────────────────────────────────── */
.about-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}
.about-text p { margin: 0 0 1rem; }
.about-facts {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 1rem;
  margin-top: 1.5rem;
}
.fact {
  padding: 0.9rem 1rem;
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: 6px;
}
.fact strong {
  display: block;
  color: var(--c-accent);
  font-size: 0.85rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: 0.2rem;
}
.fact span { font-size: 0.95rem; }

/* ── Skills ───────────────────────────────────── */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.2rem;
}
.skill-card {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: 8px;
  padding: 1.2rem 1.4rem;
}
.skill-card h3 {
  font-size: 1rem;
  margin: 0 0 0.7rem;
  color: var(--c-accent);
  display: flex;
  align-items: center;
  gap: 0.4rem;
}
.skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin: 0;
  padding: 0;
  list-style: none;
}
.skill-tag {
  background: var(--c-accent-light);
  color: var(--c-accent-dark);
  padding: 0.2rem 0.6rem;
  border-radius: 4px;
  font-size: 0.82rem;
  font-weight: 500;
}

/* ── Works ────────────────────────────────────── */
.works-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.2rem;
}
.work-card {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: 8px;
  padding: 1.4rem;
  transition: border-color 0.2s, box-shadow 0.2s;
}
.work-card:hover {
  border-color: var(--c-accent);
  box-shadow: 0 6px 16px rgba(0,0,0,0.06);
}
.work-meta {
  font-size: 0.82rem;
  color: var(--c-muted);
  margin-bottom: 0.4rem;
  letter-spacing: 0.04em;
}
.work-card h3 {
  font-size: 1.15rem;
  margin: 0 0 0.5rem;
  color: var(--c-text);
}
.work-card h3 a { color: var(--c-text); }
.work-card h3 a:hover { color: var(--c-accent); text-decoration: none; }
.work-summary { color: var(--c-text); margin: 0.4rem 0 0.8rem; font-size: 0.95rem; }
.work-card .skill-tags { margin-top: 0.6rem; }

.work-card-link {
  display: block;
  text-decoration: none;
  color: inherit;
}
.work-card-link:hover { text-decoration: none; }
.work-card-link:hover .work-card {
  border-color: var(--c-accent);
  box-shadow: 0 6px 16px rgba(0,0,0,0.06);
}
.work-card-link:hover .work-card h3 { color: var(--c-accent); }
.work-card-link .work-card { cursor: pointer; }

/* ── Blog list (top page preview) ─────────────── */
.post-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 0.6rem;
}
.post-list li {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: 6px;
  padding: 0.9rem 1.1rem;
}
.post-list .post-date {
  font-size: 0.82rem;
  color: var(--c-muted);
  margin-right: 0.6rem;
}
.blog-empty {
  background: var(--c-surface);
  border: 1px dashed var(--c-border);
  border-radius: 6px;
  padding: 1.6rem;
  color: var(--c-muted);
  text-align: center;
}

/* ── Contact / Form ──────────────────────────── */
form { display: grid; gap: 0.8rem; max-width: 580px; margin-top: 1rem; }
label {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--c-text);
  display: block;
  margin-bottom: 0.3rem;
}
input, textarea {
  width: 100%;
  padding: 0.65rem 0.8rem;
  border: 1px solid var(--c-border);
  border-radius: 5px;
  font-family: inherit;
  font-size: 0.95rem;
  background: var(--c-surface);
}
input:focus, textarea:focus {
  outline: none;
  border-color: var(--c-accent);
  box-shadow: 0 0 0 3px var(--c-accent-light);
}
textarea { min-height: 8rem; resize: vertical; }
.status {
  padding: 0.7rem 1rem;
  border-radius: 5px;
  font-size: 0.92rem;
}
.status.ok { background: #e8f5e9; color: #1d6b1d; border: 1px solid #b6e0b6; }
.status.err { background: #fde8e8; color: #8c1f1f; border: 1px solid #f1b8b8; }

/* ── Footer ──────────────────────────────────── */
footer {
  max-width: var(--max-width);
  margin: 3rem auto 0;
  padding: 2rem var(--gutter);
  border-top: 1px solid var(--c-border);
  color: var(--c-muted);
  font-size: 0.85rem;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.6rem;
}