*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --bg: #ffffff;
  --surface: #f5f5f5;
  --border: #e2e2e2;
  --text: #1a1a1a;
  --text-muted: #8a8a8a;
  --text-light: #bbb;
  --radius: 8px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Hiragino Kaku Gothic ProN',
               'Hiragino Sans', 'Meiryo', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

/* ========================
   Hero
   ======================== */
.hero {
  padding: 4rem 1.25rem 3.5rem;
  border-bottom: 1px solid var(--border);
}

.hero-inner {
  max-width: 800px;
  margin: 0 auto;
}

.brand-label {
  display: block;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--text-muted);
  text-transform: uppercase;
  margin-bottom: 1.25rem;
}

.hero-title {
  font-size: clamp(1.75rem, 5vw, 2.75rem);
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: -0.03em;
  margin-bottom: 1.25rem;
}

.hero-desc {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.8;
}

/* ========================
   Container
   ======================== */
.container {
  max-width: 800px;
  margin: 0 auto;
  padding: 0 1.25rem 5rem;
}

/* ========================
   Section blocks
   ======================== */
.section-block {
  padding-top: 3rem;
  margin-bottom: 0.5rem;
}

.section-block + .section-block {
  border-top: 1px solid var(--border);
}

.section-heading {
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
}

/* ========================
   Featured grid
   ======================== */
.featured-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 1rem;
}

/* ========================
   Filter tabs
   ======================== */
.filter-tabs {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1.25rem;
  flex-wrap: wrap;
}

.tab {
  padding: 0.35rem 0.85rem;
  border: 1px solid var(--border);
  border-radius: 20px;
  background: transparent;
  font-size: 0.78rem;
  cursor: pointer;
  color: var(--text-muted);
  transition: all 0.15s;
  font-family: inherit;
}

.tab:hover {
  border-color: var(--text);
  color: var(--text);
}

.tab.active {
  background: var(--text);
  color: #fff;
  border-color: var(--text);
}

/* ========================
   Tools grid
   ======================== */
.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 0.85rem;
}

/* ========================
   Cards (shared)
   ======================== */
.card {
  display: flex;
  flex-direction: column;
  padding: 1.1rem 1.1rem 1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  text-decoration: none;
  color: var(--text);
  background: var(--bg);
  transition: border-color 0.15s, box-shadow 0.15s;
}

.card:hover {
  border-color: #aaa;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.07);
}

.card.hidden {
  display: none;
}

/* Featured card — slightly larger feel */
.card--featured {
  padding: 1.25rem;
}

.card-top {
  margin-bottom: 0.65rem;
}

.badge {
  display: inline-block;
  font-size: 0.68rem;
  letter-spacing: 0.04em;
  color: var(--text-muted);
  background: var(--surface);
  padding: 0.18rem 0.5rem;
  border-radius: 4px;
}

.card-title {
  font-size: 0.95rem;
  font-weight: 700;
  line-height: 1.4;
  margin-bottom: 0.45rem;
}

.card-desc {
  font-size: 0.8rem;
  color: var(--text-muted);
  line-height: 1.55;
  flex: 1;
}

.card-meta {
  margin-top: 0.85rem;
  font-size: 0.72rem;
  color: var(--text-light);
}

.card-arrow {
  margin-top: 1rem;
  font-size: 0.85rem;
  color: var(--text-light);
  transition: color 0.15s;
}

.card:hover .card-arrow {
  color: var(--text);
}

/* ========================
   Category descriptions
   ======================== */
.cat-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.cat-item {
  padding: 1.1rem 0;
  border-top: 2px solid var(--text);
}

.cat-name {
  font-size: 0.82rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.cat-desc {
  font-size: 0.8rem;
  color: var(--text-muted);
  line-height: 1.65;
}

/* ========================
   Upcoming tools
   ======================== */
.upcoming-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.upcoming-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1rem;
  background: var(--surface);
  border-radius: var(--radius);
}

.upcoming-name {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.upcoming-badge {
  font-size: 0.68rem;
  letter-spacing: 0.04em;
  color: var(--text-light);
  background: #ebebeb;
  padding: 0.18rem 0.55rem;
  border-radius: 4px;
}

/* ========================
   Footer
   ======================== */
footer {
  margin-top: 3.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
  font-size: 0.75rem;
  color: #ccc;
  text-align: center;
}

/* ========================
   Responsive
   ======================== */
@media (max-width: 600px) {
  .hero {
    padding: 3rem 1.25rem 2.5rem;
  }

  .featured-grid {
    grid-template-columns: 1fr;
  }

  .cat-grid {
    grid-template-columns: 1fr;
    gap: 0;
  }

  .cat-item {
    border-top: none;
    border-left: 2px solid var(--text);
    padding: 0.5rem 0 0.5rem 1rem;
    margin-bottom: 1.25rem;
  }

  .tools-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 360px) {
  .tools-grid {
    grid-template-columns: 1fr;
  }
}

/* カテゴリナビグリッド */
.cat-nav-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 0.75rem;
}

.cat-nav-card {
  display: flex;
  flex-direction: column;
  padding: 1rem 1.1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  text-decoration: none;
  color: var(--text);
  background: var(--bg);
  transition: border-color 0.15s, box-shadow 0.15s;
}

.cat-nav-card:hover {
  border-color: #aaa;
  box-shadow: 0 2px 8px rgba(0,0,0,0.06);
}

.cat-nav-name {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 0.3rem;
}

.cat-nav-desc {
  font-size: 0.75rem;
  color: var(--text-muted);
  line-height: 1.4;
  flex: 1;
}

.cat-nav-count {
  margin-top: 0.75rem;
  font-size: 0.7rem;
  color: var(--text-light);
}