/* ===== Reset & Base ===== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --color-primary: #e63946;
  --color-primary-dark: #c1121f;
  --color-accent: #ffd700;
  --color-bg: #f8f9fa;
  --color-surface: #ffffff;
  --color-text: #212529;
  --color-text-muted: #6c757d;
  --color-border: #dee2e6;
  --color-rank1: #ffd700;
  --color-rank2: #c0c0c0;
  --color-rank3: #cd7f32;
  --font-sans: 'Hiragino Kaku Gothic ProN', 'Hiragino Sans', 'Noto Sans JP', sans-serif;
  --max-width: 1100px;
  --sidebar-width: 280px;
  --radius: 8px;
  --shadow: 0 2px 8px rgba(0,0,0,0.08);
}

html {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-text);
  background: var(--color-bg);
}

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

a:hover {
  text-decoration: underline;
}

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

/* ===== Header ===== */
.site-header {
  background: var(--color-primary);
  color: #fff;
  padding: 0 1rem;
  box-shadow: 0 2px 6px rgba(0,0,0,0.15);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}

.site-logo {
  font-size: 1.3rem;
  font-weight: 900;
  color: #fff;
  letter-spacing: -0.02em;
}

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

.site-nav {
  display: flex;
  gap: 1.5rem;
}

.site-nav a {
  color: rgba(255,255,255,0.9);
  font-size: 0.9rem;
  font-weight: 600;
}

.site-nav a:hover {
  color: #fff;
  text-decoration: none;
}

/* ===== Layout ===== */
.page-wrapper {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 2rem 1rem;
  display: grid;
  grid-template-columns: 1fr var(--sidebar-width);
  gap: 2rem;
  align-items: start;
}

@media (max-width: 768px) {
  .page-wrapper {
    grid-template-columns: 1fr;
  }
  .sidebar {
    order: -1;
  }
  .site-nav {
    display: none;
  }
}

/* ===== Sidebar ===== */
.sidebar-block {
  background: var(--color-surface);
  border-radius: var(--radius);
  padding: 1.25rem;
  margin-bottom: 1.5rem;
  box-shadow: var(--shadow);
}

.sidebar-block h3 {
  font-size: 0.95rem;
  font-weight: 800;
  color: var(--color-primary);
  border-bottom: 2px solid var(--color-primary);
  padding-bottom: 0.5rem;
  margin-bottom: 1rem;
}

.sidebar-block ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.sidebar-block li a {
  font-size: 0.88rem;
  color: var(--color-text);
  display: block;
  padding: 0.25rem 0;
  border-bottom: 1px solid var(--color-border);
}

.sidebar-block li a:hover {
  color: var(--color-primary);
  text-decoration: none;
}

/* ===== Article Card ===== */
.article-card {
  background: var(--color-surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
  transition: transform 0.2s, box-shadow 0.2s;
}

.article-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 16px rgba(0,0,0,0.12);
}

.article-card-body {
  padding: 1.25rem;
}

.article-card-category {
  display: inline-block;
  background: var(--color-primary);
  color: #fff;
  font-size: 0.72rem;
  font-weight: 700;
  padding: 0.2rem 0.6rem;
  border-radius: 4px;
  margin-bottom: 0.5rem;
}

.article-card-title {
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.4;
  margin-bottom: 0.5rem;
}

.article-card-title a {
  color: var(--color-text);
}

.article-card-title a:hover {
  color: var(--color-primary);
  text-decoration: none;
}

.article-card-meta {
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

/* ===== Article Grid ===== */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.25rem;
  margin-bottom: 2rem;
}

/* ===== Ranking Card ===== */
.rank-card {
  background: var(--color-surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.25rem;
  display: flex;
  gap: 1rem;
  align-items: center;
  margin-bottom: 1rem;
  position: relative;
  border-left: 4px solid var(--color-border);
}

.rank-card.rank-1 { border-left-color: var(--color-rank1); }
.rank-card.rank-2 { border-left-color: var(--color-rank2); }
.rank-card.rank-3 { border-left-color: var(--color-rank3); }

.rank-badge {
  font-size: 1.8rem;
  font-weight: 900;
  min-width: 3rem;
  text-align: center;
  color: var(--color-text-muted);
}

.rank-card.rank-1 .rank-badge { color: var(--color-rank1); }
.rank-card.rank-2 .rank-badge { color: var(--color-rank2); }
.rank-card.rank-3 .rank-badge { color: var(--color-rank3); }

.rank-info h3 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 0.25rem;
}

.rank-info p {
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

.rank-btn {
  margin-left: auto;
  display: inline-block;
  background: var(--color-primary);
  color: #fff;
  padding: 0.5rem 1rem;
  border-radius: 6px;
  font-size: 0.85rem;
  font-weight: 700;
  white-space: nowrap;
}

.rank-btn:hover {
  background: var(--color-primary-dark);
  text-decoration: none;
}

/* ===== Hero ===== */
.hero {
  background: linear-gradient(135deg, var(--color-primary) 0%, #b5173d 100%);
  color: #fff;
  padding: 3rem 1rem;
  text-align: center;
  margin-bottom: 2rem;
}

.hero h1 {
  font-size: 2rem;
  font-weight: 900;
  line-height: 1.3;
  margin-bottom: 0.75rem;
}

.hero p {
  font-size: 1rem;
  opacity: 0.9;
  max-width: 540px;
  margin: 0 auto 1.5rem;
}

.hero-cta {
  display: inline-block;
  background: var(--color-accent);
  color: #333;
  font-weight: 800;
  padding: 0.75rem 2rem;
  border-radius: 50px;
  font-size: 1rem;
}

.hero-cta:hover {
  background: #e6c200;
  text-decoration: none;
}

/* ===== Section ===== */
.section-title {
  font-size: 1.3rem;
  font-weight: 900;
  color: var(--color-text);
  border-left: 4px solid var(--color-primary);
  padding-left: 0.75rem;
  margin-bottom: 1.25rem;
}

/* ===== Article Body ===== */
.article-body {
  background: var(--color-surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 2rem;
  line-height: 1.85;
}

.article-body h2 {
  font-size: 1.4rem;
  font-weight: 800;
  border-bottom: 2px solid var(--color-primary);
  padding-bottom: 0.4rem;
  margin: 2rem 0 1rem;
  color: var(--color-text);
}

.article-body h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin: 1.5rem 0 0.75rem;
  padding-left: 0.75rem;
  border-left: 3px solid var(--color-primary);
}

.article-body p {
  margin-bottom: 1rem;
}

.article-body ul, .article-body ol {
  margin: 0.75rem 0 1rem 1.5rem;
}

.article-body li {
  margin-bottom: 0.4rem;
}

.article-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  font-size: 0.9rem;
}

.article-body th {
  background: var(--color-primary);
  color: #fff;
  padding: 0.6rem 0.8rem;
  text-align: left;
}

.article-body td {
  padding: 0.55rem 0.8rem;
  border-bottom: 1px solid var(--color-border);
}

.article-body tr:nth-child(even) td {
  background: #f8f9fa;
}

.article-header {
  margin-bottom: 2rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--color-border);
}

.article-title {
  font-size: 1.75rem;
  font-weight: 900;
  line-height: 1.4;
  margin-bottom: 0.5rem;
}

.article-meta {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

/* ===== Breadcrumb ===== */
.breadcrumb {
  max-width: var(--max-width);
  margin: 0.75rem auto 0;
  padding: 0 1rem;
  font-size: 0.82rem;
  color: var(--color-text-muted);
  display: flex;
  gap: 0.4rem;
  flex-wrap: wrap;
}

.breadcrumb a {
  color: var(--color-text-muted);
}

.breadcrumb a:hover {
  color: var(--color-primary);
}

/* ===== Footer ===== */
.site-footer {
  background: #2b2d42;
  color: rgba(255,255,255,0.7);
  text-align: center;
  padding: 2rem 1rem;
  margin-top: 4rem;
  font-size: 0.85rem;
}

.site-footer a {
  color: rgba(255,255,255,0.7);
  margin: 0 0.75rem;
}

.site-footer a:hover {
  color: #fff;
}

.footer-links {
  margin-bottom: 0.75rem;
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.5rem;
}

/* ===== Tag ===== */
.tag {
  display: inline-block;
  background: #f0f0f0;
  color: var(--color-text-muted);
  font-size: 0.78rem;
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
  margin: 0.15rem;
}

/* ===== CTA Box ===== */
.cta-box {
  background: linear-gradient(135deg, #fff5f5 0%, #fff 100%);
  border: 2px solid var(--color-primary);
  border-radius: var(--radius);
  padding: 1.5rem;
  text-align: center;
  margin: 2rem 0;
}

.cta-box h3 {
  font-size: 1.1rem;
  font-weight: 800;
  margin-bottom: 0.5rem;
  color: var(--color-primary);
}

.cta-box p {
  font-size: 0.9rem;
  margin-bottom: 1rem;
}

.cta-box a {
  display: inline-block;
  background: var(--color-primary);
  color: #fff;
  padding: 0.65rem 1.75rem;
  border-radius: 50px;
  font-weight: 700;
}

.cta-box a:hover {
  background: var(--color-primary-dark);
  text-decoration: none;
}

/* ===== Notice ===== */
.affiliate-notice {
  background: #fffbeb;
  border: 1px solid #fde68a;
  border-radius: 6px;
  padding: 0.75rem 1rem;
  font-size: 0.82rem;
  color: #92400e;
  margin-bottom: 1.5rem;
}