:root {
  --primary: #3386e7;
  --primary-hover: #2563eb;
  --ink: #1c2733;
  --muted: #5b6b7b;
  --bg: #ffffff;
  --bg-alt: #f3f7fc;
  --line: #e3eaf2;
  --accent-blue: #4089cb;
  --accent-orange: #d86e38;
  --accent-green: #275d47;
  --radius: 16px;
  --maxw: 1080px;
  --font: "Hiragino Maru Gothic ProN", "Hiragino Sans", "Yu Gothic", "Meiryo", "Helvetica Neue", Arial, sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}

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

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

.container { width: min(var(--maxw), 100% - 2.5rem); margin-inline: auto; }

/* Skip link */
.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--ink);
  color: #fff;
  padding: 0.6rem 1rem;
  border-radius: 0 0 8px 0;
  z-index: 100;
}
.skip-link:focus { left: 0; }

/* Focus visibility */
a:focus-visible, .btn:focus-visible {
  outline: 3px solid var(--accent-orange);
  outline-offset: 3px;
  border-radius: 6px;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.7rem clamp(1rem, 4vw, 2.5rem);
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--primary);
  text-decoration: none;
}

.site-nav { display: flex; gap: clamp(0.8rem, 2.5vw, 1.8rem); flex-wrap: wrap; }
.site-nav a {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 600;
}
.site-nav a:hover { color: var(--primary); }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.8rem 1.5rem;
  border-radius: 999px;
  font-weight: 700;
  text-decoration: none;
  transition: transform 0.15s ease, background 0.15s ease, box-shadow 0.15s ease;
}
.btn-primary {
  background: var(--primary);
  color: #fff;
  box-shadow: 0 8px 20px rgba(51, 134, 231, 0.25);
}
.btn-primary:hover { background: var(--primary-hover); transform: translateY(-2px); }
.btn-ghost {
  background: transparent;
  color: var(--primary);
  border: 2px solid var(--primary);
}
.btn-ghost:hover { background: rgba(51, 134, 231, 0.08); transform: translateY(-2px); }

/* Hero */
.hero {
  position: relative;
  padding: clamp(3.5rem, 10vw, 7rem) 1.25rem clamp(3rem, 8vw, 5.5rem);
  text-align: center;
  background:
    radial-gradient(60% 60% at 50% 0%, rgba(64, 137, 203, 0.12), transparent 70%),
    linear-gradient(180deg, var(--bg-alt), var(--bg));
  overflow: hidden;
}
.hero-inner { max-width: 760px; margin-inline: auto; }
.hero-logo {
  width: clamp(84px, 14vw, 120px);
  height: auto;
  margin: 0 auto 1.2rem;
  filter: drop-shadow(0 10px 24px rgba(28, 39, 51, 0.12));
}
.hero-tag {
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--accent-blue);
  margin: 0 0 0.6rem;
}
.hero-tag span { color: var(--accent-orange); margin: 0 0.3em; }
.hero h1 {
  font-size: clamp(2rem, 6vw, 3.2rem);
  line-height: 1.3;
  margin: 0 0 1.2rem;
  letter-spacing: 0.01em;
}
.hero-lead { color: var(--muted); font-size: clamp(1rem, 2.4vw, 1.12rem); margin: 0 auto 2rem; }
.hero-lead .emoji { white-space: nowrap; }
.hero-actions { display: flex; gap: 0.8rem; justify-content: center; flex-wrap: wrap; }

/* Sections */
.section { padding: clamp(3rem, 8vw, 5.5rem) 0; }
.section-alt { background: var(--bg-alt); }
.eyebrow {
  color: var(--accent-blue);
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-size: 0.85rem;
  margin: 0 0 0.4rem;
}
.section h2 {
  font-size: clamp(1.6rem, 4.5vw, 2.3rem);
  margin: 0 0 1rem;
  line-height: 1.4;
}
.section-lead { color: var(--muted); max-width: 60ch; margin: 0 0 2.2rem; }

/* Cards */
.cards {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 1.2rem;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}
.card {
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.6rem;
  box-shadow: 0 4px 18px rgba(28, 39, 51, 0.04);
}
.card-dot {
  display: inline-block;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--dot, var(--primary));
  margin-bottom: 0.8rem;
}
.card h3 { margin: 0 0 0.4rem; font-size: 1.2rem; }
.card p { margin: 0; color: var(--muted); }

/* Work */
.work {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: clamp(1.5rem, 4vw, 3rem);
  align-items: center;
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: clamp(1.2rem, 3vw, 2rem);
  box-shadow: 0 10px 30px rgba(28, 39, 51, 0.06);
}
.work-media img { border-radius: 12px; }
.work-body h3 { font-size: clamp(1.4rem, 3.5vw, 1.9rem); margin: 0 0 0.8rem; }
.work-body p { color: var(--muted); margin: 0 0 1rem; }
.work-note {
  font-size: 0.92rem;
  padding-left: 0.9rem;
  border-left: 3px solid var(--accent-blue);
}
.work-actions { display: flex; gap: 0.7rem; flex-wrap: wrap; margin-top: 1.4rem; }

/* Activities */
.activity {
  margin: 0;
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 4px 18px rgba(28, 39, 51, 0.04);
}
.activity img { aspect-ratio: 16 / 10; object-fit: cover; width: 100%; }
.activity figcaption { padding: 1.3rem 1.5rem 1.6rem; }
.activity h3 { margin: 0 0 0.4rem; font-size: 1.25rem; }
.activity p { margin: 0; color: var(--muted); }

/* Feature layout: image left, text right */
.activity-feature {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  align-items: stretch;
}
.activity-feature img { height: 100%; aspect-ratio: auto; }
.activity-feature figcaption { display: flex; flex-direction: column; justify-content: center; }
@media (max-width: 720px) {
  .activity-feature { grid-template-columns: 1fr; }
  .activity-feature img { aspect-ratio: 16 / 10; }
}

/* CTA section */
.section-cta {
  background:
    radial-gradient(70% 100% at 50% 0%, rgba(64, 137, 203, 0.14), transparent 70%),
    var(--bg-alt);
  text-align: center;
}
.section-cta .section-lead { margin-inline: auto; }
.link-buttons { display: flex; gap: 0.9rem; justify-content: center; flex-wrap: wrap; }

/* CTA cards */
.cta-cards {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 1.2rem;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  text-align: left;
}
.cta-card {
  display: flex;
  flex-direction: column;
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.8rem 1.6rem;
  box-shadow: 0 4px 18px rgba(28, 39, 51, 0.04);
}
.cta-emoji { font-size: 2rem; line-height: 1; margin-bottom: 0.7rem; }
.cta-card h3 { margin: 0 0 0.5rem; font-size: 1.2rem; }
.cta-card p { margin: 0 0 1.5rem; color: var(--muted); flex: 1; }
.cta-card .btn { align-self: flex-start; margin-top: auto; }

/* Footer */
.site-footer {
  border-top: 1px solid var(--line);
  padding: 2.2rem 0;
  background: var(--bg);
}
.footer-inner {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
}
.footer-links { display: flex; gap: 1.3rem; flex-wrap: wrap; }
.footer-links a { color: var(--muted); text-decoration: none; font-weight: 600; font-size: 0.95rem; }
.footer-links a:hover { color: var(--primary); }
.copyright { color: var(--muted); font-size: 0.9rem; margin: 0; }

/* Responsive */
@media (max-width: 720px) {
  .work { grid-template-columns: 1fr; }
  .site-nav { display: none; }
}

/* Respect reduced motion */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; }
}