@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+JP:wght@400;500;700&family=JetBrains+Mono:wght@400;500&display=swap');

:root {
  --color-bg:          #F4F6F9;
  --color-bg-card:     #FFFFFF;
  --color-bg-sidebar:  #EAECF0;
  --color-bg-header:   #FFFFFF;
  --color-bg-footer:   #2C3E50;
  --color-text-primary:   #1A2332;
  --color-text-secondary: #5A6A7A;
  --color-text-muted:     #9AA5B4;
  --color-text-on-dark:   #F0F4F8;
  --color-accent:       #2B7FE8;
  --color-accent-hover: #1A6DD4;
  --color-accent-light: #E8F1FD;
  --color-accent-dark:  #1554A0;
  --color-border:       #D0D7E0;
  --color-border-focus: #2B7FE8;
  --shadow-card:        0 2px 8px rgba(0,0,0,0.08);
  --shadow-card-hover:  0 4px 16px rgba(0,0,0,0.12);
  --font-body: 'Noto Sans JP', sans-serif;
  --font-code: 'JetBrains Mono', monospace;
  --text-xs:   0.75rem;
  --text-sm:   0.875rem;
  --text-base: 1rem;
  --text-lg:   1.125rem;
  --text-xl:   1.25rem;
  --text-2xl:  1.5rem;
  --text-3xl:  1.875rem;
  --content-max-width:  1200px;
  --header-height:      60px;
}

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

body {
  font-family: var(--font-body);
  background: var(--color-bg);
  color: var(--color-text-primary);
  font-size: var(--text-base);
  line-height: 1.6;
}

/* ========== HEADER ========== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background: var(--color-bg-header);
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  padding: 0 28px;
  z-index: 200;
  box-shadow: 0 1px 4px rgba(0,0,0,0.06);
}

.site-logo {
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-text-primary);
  text-decoration: none;
  letter-spacing: -0.02em;
}

.site-logo .logo-accent {
  color: var(--color-accent);
}

/* ========== PAGE STRUCTURE ========== */
.page-wrapper {
  padding-top: var(--header-height);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.content-wrapper {
  flex: 1;
}

.main-content {
  max-width: var(--content-max-width);
  margin: 0 auto;
  padding: 40px 28px;
  width: 100%;
}

/* ========== FOOTER ========== */
.site-footer {
  background: var(--color-bg-footer);
  color: var(--color-text-on-dark);
  padding: 36px 20px;
  margin-top: auto;
}

.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  text-align: center;
}

.footer-logo {
  font-size: var(--text-lg);
  font-weight: 700;
}

.footer-logo .logo-accent {
  color: #90c4ff;
}

.footer-links {
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
  justify-content: center;
}

.footer-links a {
  color: var(--color-text-on-dark);
  text-decoration: none;
  font-size: var(--text-sm);
  opacity: 0.75;
  transition: opacity 0.15s;
}

.footer-links a:hover {
  opacity: 1;
}

.footer-copy {
  font-size: var(--text-xs);
  opacity: 0.5;
}

/* ========== BUTTONS ========== */
.btn-primary {
  display: inline-block;
  background: var(--color-accent);
  color: #fff;
  border-radius: 6px;
  padding: 10px 24px;
  font-weight: 500;
  font-size: var(--text-base);
  font-family: var(--font-body);
  text-decoration: none;
  border: none;
  cursor: pointer;
  transition: background 0.2s, transform 0.15s;
}

.btn-primary:hover {
  background: var(--color-accent-hover);
  transform: translateY(-1px);
}

/* ========== BADGES ========== */
.badge {
  display: inline-block;
  padding: 2px 10px;
  border-radius: 20px;
  font-size: var(--text-xs);
  font-weight: 500;
}

.badge-category {
  background: var(--color-accent-light);
  color: var(--color-accent-dark);
}

.badge-basic {
  background: #E8F5E9;
  color: #2E7D32;
}

.badge-advanced {
  background: #FFF3E0;
  color: #E65100;
}

/* ========== HERO ========== */
.hero {
  background: linear-gradient(135deg, #FFFFFF 0%, #C4DAFC 100%);
  border: 1px solid rgba(43, 127, 232, 0.25);
  padding: 36px 40px;
  border-radius: 12px;
  margin-bottom: 32px;
}

.hero-eyebrow {
  font-size: var(--text-xs);
  font-weight: 700;
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 12px;
}

.hero-title {
  font-size: var(--text-3xl);
  font-weight: 700;
  color: var(--color-text-primary);
  line-height: 1.3;
  margin-bottom: 16px;
}

.hero-desc {
  font-size: var(--text-base);
  color: var(--color-text-secondary);
  line-height: 1.8;
  margin-bottom: 20px;
}

/* ========== EXAMPLE CARDS ========== */
.section-heading {
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-text-primary);
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.section-heading::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--color-border);
}

.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 20px;
}

.example-card {
  background: var(--color-bg-card);
  border-radius: 10px;
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-card);
  text-decoration: none;
  color: inherit;
  overflow: hidden;
  transition: box-shadow 0.2s, transform 0.2s, border-color 0.2s;
  display: flex;
  flex-direction: column;
}

.example-card:hover {
  box-shadow: 0 8px 28px rgba(43, 127, 232, 0.18);
  transform: translateY(-4px);
  border-color: var(--color-accent);
}

.example-card.coming-soon {
  opacity: 0.55;
  cursor: default;
  pointer-events: none;
}

.card-preview {
  background: var(--color-bg);
  height: 140px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  border-bottom: 1px solid var(--color-border);
}

.card-body {
  padding: 16px;
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.card-badges {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.card-title {
  font-size: var(--text-base);
  font-weight: 700;
  color: var(--color-text-primary);
  line-height: 1.4;
}

.card-desc {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  line-height: 1.65;
  flex: 1;
}

.card-coming-soon-label {
  display: inline-block;
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  font-weight: 500;
}

/* ========== EXAMPLES FILTER ========== */
.examples-filter {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-bottom: 28px;
}

.filter-search-input {
  width: 100%;
  max-width: 440px;
  padding: 10px 16px;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  font-size: var(--text-sm);
  font-family: var(--font-body);
  background: var(--color-bg-card);
  color: var(--color-text-primary);
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.filter-search-input:focus {
  border-color: var(--color-border-focus);
  box-shadow: 0 0 0 3px rgba(43, 127, 232, 0.12);
}

.filter-search-input::placeholder {
  color: var(--color-text-muted);
}

.filter-categories {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.filter-cat-btn {
  padding: 6px 16px;
  border-radius: 20px;
  border: 1px solid var(--color-border);
  background: var(--color-bg-card);
  color: var(--color-text-secondary);
  font-size: var(--text-sm);
  font-family: var(--font-body);
  cursor: pointer;
  transition: border-color 0.15s, color 0.15s, background 0.15s;
  white-space: nowrap;
}

.filter-cat-btn:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.filter-cat-btn.active {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: #fff;
  font-weight: 500;
}

.no-results {
  display: none;
  padding: 40px 0;
  text-align: center;
  color: var(--color-text-muted);
  font-size: var(--text-sm);
}

/* ========== RESPONSIVE ========== */
@media (max-width: 768px) {
  .main-content {
    padding: 24px 16px;
  }

  .hero {
    padding: 28px 20px;
  }

  .hero-title {
    font-size: var(--text-2xl);
  }

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