/* =========================================================
   つみたてNAVI - メインスタイルシート
   投資初心者向けアフィリエイトサイト
   ========================================================= */

:root {
  --color-primary: #0b2545;
  --color-primary-light: #134074;
  --color-accent: #d4a574;
  --color-accent-dark: #b88a5a;
  --color-success: #13c296;
  --color-bg: #fafaf7;
  --color-card: #ffffff;
  --color-text: #1a1a1a;
  --color-text-muted: #6b7280;
  --color-border: #e5e7eb;
  --shadow-sm: 0 1px 2px rgba(11, 37, 69, 0.05);
  --shadow-md: 0 4px 12px rgba(11, 37, 69, 0.08);
  --shadow-lg: 0 12px 32px rgba(11, 37, 69, 0.12);
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --font-sans: 'Hiragino Sans', 'Yu Gothic', 'Meiryo', system-ui, -apple-system, 'Segoe UI', sans-serif;
  --font-serif: 'Hiragino Mincho ProN', 'Yu Mincho', 'Noto Serif JP', serif;
  --max-width: 1100px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.8;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: var(--color-primary-light);
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  color: var(--color-accent-dark);
  text-decoration: underline;
}

/* ============== ヘッダー ============== */
.site-header {
  background: var(--color-primary);
  color: #fff;
  padding: 18px 0;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow-md);
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.site-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  color: #fff;
  font-weight: 800;
  font-size: 22px;
  letter-spacing: 0.02em;
}

.site-logo:hover {
  color: var(--color-accent);
  text-decoration: none;
}

.logo-mark {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-dark) 100%);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
  font-weight: 900;
  font-size: 18px;
}

.site-nav {
  display: flex;
  gap: 28px;
}

.site-nav a {
  color: #fff;
  font-size: 15px;
  font-weight: 500;
  opacity: 0.9;
}

.site-nav a:hover {
  opacity: 1;
  color: var(--color-accent);
  text-decoration: none;
}

.menu-toggle {
  display: none;
  background: none;
  border: 0;
  color: #fff;
  font-size: 24px;
  cursor: pointer;
}

/* ============== ヒーロー ============== */
.hero {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
  color: #fff;
  padding: 80px 24px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -10%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(212, 165, 116, 0.15) 0%, transparent 70%);
  pointer-events: none;
}

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

.hero h1 {
  font-size: 40px;
  font-weight: 800;
  line-height: 1.4;
  margin-bottom: 20px;
  letter-spacing: 0.02em;
}

.hero h1 .accent {
  color: var(--color-accent);
}

.hero p {
  font-size: 18px;
  opacity: 0.92;
  margin-bottom: 32px;
}

.hero-cta {
  display: inline-block;
  background: var(--color-accent);
  color: var(--color-primary);
  padding: 14px 36px;
  font-weight: 700;
  border-radius: 50px;
  font-size: 16px;
  box-shadow: var(--shadow-lg);
}

.hero-cta:hover {
  background: #e5b888;
  color: var(--color-primary);
  text-decoration: none;
  transform: translateY(-2px);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.2);
}

/* ============== コンテナ ============== */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 60px 24px;
}

.section-title {
  font-size: 28px;
  font-weight: 800;
  color: var(--color-primary);
  margin-bottom: 8px;
  display: inline-block;
  position: relative;
  padding-bottom: 8px;
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 50px;
  height: 4px;
  background: var(--color-accent);
  border-radius: 2px;
}

.section-sub {
  color: var(--color-text-muted);
  margin-bottom: 36px;
  font-size: 15px;
}

/* ============== 記事カードグリッド ============== */
.article-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 28px;
}

.article-card {
  background: var(--color-card);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
  display: flex;
  flex-direction: column;
  border: 1px solid var(--color-border);
}

.article-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.article-card a {
  color: inherit;
  text-decoration: none;
  display: flex;
  flex-direction: column;
  height: 100%;
}

.article-thumb {
  width: 100%;
  height: 180px;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-accent);
  font-size: 64px;
  font-weight: 900;
  position: relative;
  overflow: hidden;
}

.article-thumb.thumb-nisa { background: linear-gradient(135deg, #0b2545 0%, #13c296 100%); }
.article-thumb.thumb-us   { background: linear-gradient(135deg, #0b2545 0%, #d4a574 100%); }
.article-thumb.thumb-jp   { background: linear-gradient(135deg, #134074 0%, #c8102e 100%); }
.article-thumb.thumb-tsumitate { background: linear-gradient(135deg, #0b2545 0%, #6b7eff 100%); }

.article-thumb-label {
  position: absolute;
  top: 12px;
  left: 12px;
  background: rgba(255, 255, 255, 0.95);
  color: var(--color-primary);
  font-size: 12px;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: 50px;
}

.article-body {
  padding: 20px 22px;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.article-date {
  font-size: 13px;
  color: var(--color-text-muted);
  margin-bottom: 8px;
}

.article-title {
  font-size: 17px;
  font-weight: 700;
  line-height: 1.55;
  color: var(--color-text);
  margin-bottom: 10px;
  flex: 1;
}

.article-card:hover .article-title {
  color: var(--color-primary-light);
}

.article-excerpt {
  font-size: 14px;
  color: var(--color-text-muted);
  line-height: 1.65;
}

/* ============== カテゴリチップ ============== */
.category-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 40px;
}

.chip {
  background: #fff;
  border: 1.5px solid var(--color-border);
  color: var(--color-text);
  padding: 8px 18px;
  border-radius: 50px;
  font-size: 14px;
  font-weight: 600;
  transition: all 0.2s;
}

.chip:hover,
.chip.active {
  background: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
  text-decoration: none;
}

/* ============== 記事ページ ============== */
.article-page {
  max-width: 760px;
  margin: 0 auto;
  padding: 60px 24px;
}

.article-page header {
  margin-bottom: 36px;
  padding-bottom: 28px;
  border-bottom: 2px solid var(--color-border);
}

.article-page .meta {
  font-size: 14px;
  color: var(--color-text-muted);
  margin-bottom: 12px;
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  align-items: center;
}

.article-page .category-badge {
  background: var(--color-primary);
  color: #fff;
  padding: 4px 12px;
  border-radius: 50px;
  font-size: 12px;
  font-weight: 700;
}

.article-page h1 {
  font-size: 32px;
  font-weight: 800;
  line-height: 1.45;
  color: var(--color-primary);
  margin-bottom: 12px;
}

.article-page h2 {
  font-size: 24px;
  font-weight: 800;
  color: var(--color-primary);
  margin-top: 48px;
  margin-bottom: 18px;
  padding-left: 16px;
  border-left: 5px solid var(--color-accent);
  line-height: 1.45;
}

.article-page h3 {
  font-size: 19px;
  font-weight: 700;
  color: var(--color-primary-light);
  margin-top: 32px;
  margin-bottom: 14px;
}

.article-page p {
  margin-bottom: 1.4em;
  font-size: 16px;
}

.article-page ul,
.article-page ol {
  margin-bottom: 1.4em;
  padding-left: 1.8em;
}

.article-page ul li,
.article-page ol li {
  margin-bottom: 0.5em;
}

.article-page blockquote {
  background: #fff;
  border-left: 4px solid var(--color-accent);
  padding: 20px 24px;
  margin: 24px 0;
  border-radius: var(--radius-sm);
  color: var(--color-text-muted);
  font-style: normal;
  box-shadow: var(--shadow-sm);
}

.article-page table {
  width: 100%;
  border-collapse: collapse;
  margin: 24px 0;
  background: #fff;
  border-radius: var(--radius-sm);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.article-page th,
.article-page td {
  padding: 12px 16px;
  text-align: left;
  border-bottom: 1px solid var(--color-border);
  font-size: 15px;
}

.article-page th {
  background: var(--color-primary);
  color: #fff;
  font-weight: 700;
}

.article-page tr:last-child td {
  border-bottom: none;
}

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

/* ============== ポイントボックス ============== */
.point-box {
  background: linear-gradient(135deg, #fff8ed 0%, #fef3df 100%);
  border-left: 5px solid var(--color-accent);
  padding: 20px 24px;
  margin: 24px 0;
  border-radius: var(--radius-sm);
}

.point-box-title {
  font-weight: 800;
  color: var(--color-primary);
  margin-bottom: 10px;
  font-size: 16px;
}

.point-box ul {
  margin: 0;
  padding-left: 1.4em;
}

/* ============== A8.netアフィリエイト枠 ============== */
.affiliate-card {
  background: linear-gradient(135deg, #fff 0%, #fafafa 100%);
  border: 2px solid var(--color-accent);
  border-radius: var(--radius-md);
  padding: 24px 28px;
  margin: 32px 0;
  box-shadow: var(--shadow-md);
  position: relative;
}

.affiliate-card::before {
  content: 'PR';
  position: absolute;
  top: -10px;
  left: 16px;
  background: var(--color-accent);
  color: var(--color-primary);
  font-size: 11px;
  font-weight: 800;
  padding: 2px 10px;
  border-radius: 50px;
  letter-spacing: 0.08em;
}

.affiliate-card h4 {
  font-size: 18px;
  font-weight: 800;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.affiliate-card p {
  color: var(--color-text-muted);
  font-size: 14px;
  margin-bottom: 16px;
}

.affiliate-btn {
  display: inline-block;
  background: var(--color-primary);
  color: #fff;
  padding: 12px 28px;
  border-radius: 50px;
  font-weight: 700;
  font-size: 15px;
  transition: all 0.2s;
}

.affiliate-btn:hover {
  background: var(--color-primary-light);
  color: #fff;
  text-decoration: none;
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

/* ============== サイドCTA ============== */
.cta-banner {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
  color: #fff;
  padding: 48px 32px;
  border-radius: var(--radius-lg);
  text-align: center;
  margin: 60px 0;
}

.cta-banner h3 {
  font-size: 24px;
  font-weight: 800;
  margin-bottom: 12px;
}

.cta-banner p {
  opacity: 0.9;
  margin-bottom: 24px;
}

/* ============== フッター ============== */
.site-footer {
  background: var(--color-primary);
  color: #fff;
  padding: 56px 24px 24px;
  margin-top: 60px;
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr;
  gap: 40px;
}

.site-footer h4 {
  font-size: 15px;
  margin-bottom: 16px;
  color: var(--color-accent);
  letter-spacing: 0.04em;
}

.site-footer ul {
  list-style: none;
}

.site-footer ul li {
  margin-bottom: 10px;
}

.site-footer a {
  color: #fff;
  opacity: 0.8;
  font-size: 14px;
}

.site-footer a:hover {
  opacity: 1;
  color: var(--color-accent);
  text-decoration: none;
}

.site-footer .footer-brand p {
  opacity: 0.7;
  font-size: 13px;
  line-height: 1.7;
  margin-top: 12px;
}

.copyright {
  max-width: var(--max-width);
  margin: 40px auto 0;
  padding-top: 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  text-align: center;
  opacity: 0.6;
  font-size: 13px;
}

/* ============== パンくずリスト ============== */
.breadcrumb {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 16px 24px 0;
  font-size: 13px;
  color: var(--color-text-muted);
}
.breadcrumb ol {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 6px 10px;
  padding: 0;
  margin: 0;
}
.breadcrumb li {
  display: flex;
  align-items: center;
  gap: 10px;
}
.breadcrumb li + li::before {
  content: '›';
  color: var(--color-text-muted);
  opacity: 0.6;
}
.breadcrumb a {
  color: var(--color-primary-light);
  text-decoration: none;
}
.breadcrumb a:hover { text-decoration: underline; }
.breadcrumb li[aria-current="page"] {
  color: var(--color-text);
  font-weight: 600;
}

/* ============== 記事ページの細部 ============== */
.article-page .lead {
  color: var(--color-text-muted);
  margin-top: 8px;
  font-size: 16px;
  line-height: 1.7;
}
.article-divider {
  margin: 60px 0 30px;
  border: none;
  border-top: 1px solid var(--color-border);
}
.disclaimer-note {
  font-size: 13px;
  color: var(--color-text-muted);
  background: #fff;
  border-left: 3px solid var(--color-border);
  padding: 12px 16px;
  border-radius: var(--radius-sm);
}
.back-link {
  margin-top: 40px;
  font-size: 15px;
  font-weight: 600;
}

/* ============== トップへ戻るボタン ============== */
.to-top {
  position: fixed;
  right: 22px;
  bottom: 22px;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  border: none;
  background: var(--color-primary);
  color: var(--color-accent);
  font-size: 22px;
  font-weight: 800;
  cursor: pointer;
  box-shadow: var(--shadow-lg);
  opacity: 0;
  pointer-events: none;
  transform: translateY(8px);
  transition: opacity 0.25s ease, transform 0.25s ease, background 0.2s ease;
  z-index: 90;
}
.to-top.visible {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}
.to-top:hover {
  background: var(--color-primary-light);
}
.to-top:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 2px;
}

/* ============== フェードイン（IntersectionObserver用） ============== */
.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.reveal.in {
  opacity: 1;
  transform: translateY(0);
}
.article-card.reveal { opacity: 0; transform: translateY(20px); }
.article-card.reveal.in { opacity: 1; transform: translateY(0); }

@media (prefers-reduced-motion: reduce) {
  .reveal, .article-card.reveal {
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
  }
  html { scroll-behavior: auto; }
}

/* ============== レスポンシブ ============== */
@media (max-width: 768px) {
  .hero h1 { font-size: 28px; }
  .hero p { font-size: 16px; }
  .hero { padding: 56px 20px; }
  .container { padding: 40px 20px; }
  .section-title { font-size: 22px; }
  .article-page h1 { font-size: 24px; }
  .article-page h2 { font-size: 19px; }
  .footer-inner { grid-template-columns: 1fr; gap: 32px; }
  .site-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--color-primary);
    flex-direction: column;
    padding: 20px 24px;
    gap: 16px;
    box-shadow: var(--shadow-md);
  }
  .site-nav.open { display: flex; }
  .menu-toggle { display: block; }
}