/* ============================================================
   ビジネス会計検定 問題道場
   Design: 基本情報技術者試験ドットコム風（グリーン系クリーン）
   ============================================================ */

:root {
  --green-main:   #5b8c00;
  --green-dark:   #3d5c00;
  --green-light:  #f0f7e0;
  --green-border: #c5dda0;
  --green-nav:    #444;

  --gray-50:  #f8f9fa;
  --gray-100: #f1f3f0;
  --gray-200: #e0e4dc;
  --gray-300: #c8ceC3;
  --gray-400: #9aa696;
  --gray-500: #6b7668;
  --gray-600: #4a5247;
  --gray-700: #333b30;
  --gray-800: #232820;
  --gray-900: #141610;

  --blue-600: #2563eb;
  --purple-600: #7c3aed;
  --red-600:  #dc2626;
  --yellow:   #facc15;

  --shadow-xs: 0 1px 2px rgba(0,0,0,.06);
  --shadow-sm: 0 2px 4px rgba(0,0,0,.08);
  --shadow-md: 0 4px 8px rgba(0,0,0,.10);

  --radius-sm: 4px;
  --radius:    6px;
  --radius-lg: 8px;

  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans JP",
          "Hiragino Sans", Meiryo, sans-serif;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font);
  font-size: 14px;
  line-height: 1.7;
  color: var(--gray-700);
  background: var(--gray-100);
  -webkit-font-smoothing: antialiased;
}
a { color: var(--green-main); text-decoration: none; }
a:hover { text-decoration: underline; color: var(--green-dark); }
h1,h2,h3,h4 { font-weight: 700; line-height: 1.35; color: var(--gray-800); }

/* ── Top bar ── */
.top-bar {
  background: var(--green-main);
  color: #fff;
  font-size: .75rem;
  padding: 4px 20px;
  text-align: center;
  letter-spacing: .02em;
}

/* ── Header ── */
header {
  background: #fff;
  border-bottom: 3px solid var(--green-main);
  box-shadow: var(--shadow-xs);
}
.header-inner {
  max-width: 1000px;
  margin: 0 auto;
  padding: 10px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.site-title {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
}
.site-logo {
  width: 40px;
  height: 40px;
  background: var(--green-main);
  color: #fff;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  font-weight: 900;
  flex-shrink: 0;
}
.site-title-text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}
.site-title-text strong {
  font-size: 1.05rem;
  color: var(--gray-800);
  font-weight: 800;
}
.site-title-text small {
  font-size: .68rem;
  color: var(--gray-400);
  letter-spacing: .04em;
}
.site-title:hover { text-decoration: none; }
.header-right { font-size: .82rem; color: var(--gray-500); text-align: right; }

/* ── Global Nav ── */
.global-nav {
  background: var(--green-nav);
  border-bottom: 1px solid #222;
}
.global-nav ul {
  max-width: 1000px;
  margin: 0 auto;
  list-style: none;
  display: flex;
  flex-wrap: wrap;
}
.global-nav a {
  display: block;
  padding: 10px 18px;
  color: #ddd;
  font-size: .85rem;
  font-weight: 500;
  text-decoration: none;
  border-right: 1px solid #555;
  transition: background .15s, color .15s;
  white-space: nowrap;
}
.global-nav a:hover { background: var(--green-main); color: #fff; text-decoration: none; }
.global-nav a.active { background: var(--green-main); color: #fff; }

/* ── Ad Area ── */
.ad-area {
  max-width: 1000px;
  margin: 14px auto;
  padding: 0 20px;
  min-height: 90px;
}
.ad-area ins { border-radius: var(--radius); overflow: hidden; }

/* ── Main Layout ── */
.page-wrap {
  max-width: 1000px;
  margin: 0 auto;
  padding: 16px 20px 60px;
}

/* ── Breadcrumb ── */
.breadcrumb {
  font-size: .8rem;
  color: var(--gray-400);
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
}
.breadcrumb a { color: var(--green-main); }
.breadcrumb span { color: var(--gray-300); }

/* ── Page Title ── */
.page-title-wrap {
  border-left: 4px solid var(--green-main);
  padding: 4px 0 4px 12px;
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
}
.page-title-wrap h1 {
  font-size: 1.3rem;
  color: var(--gray-800);
}

/* ── Dojo logo block ── */
.dojo-hero {
  background: #fff;
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  padding: 28px 32px;
  margin-bottom: 20px;
  text-align: center;
  box-shadow: var(--shadow-xs);
}
.dojo-logo-text {
  font-size: clamp(2rem, 6vw, 3.5rem);
  font-weight: 900;
  color: var(--gray-800);
  letter-spacing: -.02em;
  line-height: 1;
  margin-bottom: 16px;
}
.dojo-logo-text span {
  display: inline-block;
  background: var(--green-main);
  color: #fff;
  font-size: .5em;
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  vertical-align: middle;
  margin-left: 8px;
  font-weight: 700;
}
.dojo-desc { font-size: .92rem; color: var(--gray-600); max-width: 660px; margin: 0 auto 20px; line-height: 1.8; }
.dojo-stats {
  display: flex;
  justify-content: center;
  gap: 28px;
  flex-wrap: wrap;
  padding-top: 16px;
  border-top: 1px solid var(--gray-200);
}
.dojo-stat { text-align: center; }
.dojo-stat .num { font-size: 1.5rem; font-weight: 800; color: var(--green-main); line-height: 1; }
.dojo-stat .lbl { font-size: .72rem; color: var(--gray-400); margin-top: 3px; }

/* ── Tab Style (Grade selector) ── */
.section-tabs {
  display: flex;
  border-bottom: 2px solid var(--green-main);
  margin-bottom: 16px;
  flex-wrap: wrap;
}
.section-tab {
  padding: 9px 22px;
  font-size: .88rem;
  font-weight: 600;
  color: var(--gray-500);
  cursor: pointer;
  border: 1px solid var(--gray-200);
  border-bottom: none;
  background: var(--gray-100);
  transition: all .15s;
  text-decoration: none;
  display: block;
}
.section-tab:hover { background: var(--green-light); color: var(--green-main); text-decoration: none; }
.section-tab.active {
  background: #fff;
  color: var(--green-main);
  border-color: var(--green-main);
  border-bottom: 2px solid #fff;
  margin-bottom: -2px;
}

/* ── Checkbox Grid (問題選択) ── */
.checkbox-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 8px;
  margin-bottom: 16px;
}
.checkbox-item {
  display: flex;
  align-items: center;
  gap: 6px;
  background: #fff;
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-sm);
  padding: 8px 12px;
  font-size: .83rem;
  cursor: pointer;
  transition: background .12s, border-color .12s;
  text-decoration: none;
  color: var(--gray-700);
}
.checkbox-item:hover { background: var(--green-light); border-color: var(--green-border); color: var(--green-dark); text-decoration: none; }
.checkbox-item::before { content: "☑"; color: var(--green-main); font-size: 1rem; }

/* ── White Card ── */
.card {
  background: #fff;
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  padding: 22px 24px;
  box-shadow: var(--shadow-xs);
  margin-bottom: 16px;
}
.card h2 {
  font-size: 1.05rem;
  color: var(--green-dark);
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--gray-200);
}

/* ── Grade Cards ── */
.grade-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 16px;
  margin-bottom: 20px;
}
.grade-card {
  background: #fff;
  border: 1px solid var(--gray-200);
  border-top: 3px solid var(--green-main);
  border-radius: var(--radius-lg);
  padding: 22px;
  box-shadow: var(--shadow-xs);
  transition: box-shadow .2s, transform .15s;
  display: flex;
  flex-direction: column;
}
.grade-card:hover { box-shadow: var(--shadow-md); transform: translateY(-2px); }
.grade-card.grade2 { border-top-color: var(--purple-600); }
.grade-card h2 { font-size: 1.05rem; color: var(--green-dark); border-bottom: none; padding-bottom: 0; margin-bottom: 8px; }
.grade-card.grade2 h2 { color: var(--purple-600); }
.grade-card > p { font-size: .85rem; color: var(--gray-500); margin-bottom: 12px; flex: 1; }
.topic-list { list-style: none; margin-bottom: 16px; }
.topic-list li { font-size: .83rem; color: var(--gray-600); padding: 3px 0 3px 18px; position: relative; border-bottom: 1px dotted var(--gray-200); }
.topic-list li:last-child { border-bottom: none; }
.topic-list li::before { content: "▶"; position: absolute; left: 0; color: var(--green-main); font-size: .65rem; top: 6px; }

/* ── Buttons ── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 9px 20px;
  border-radius: var(--radius);
  font-size: .88rem;
  font-weight: 600;
  text-decoration: none;
  transition: all .15s;
  cursor: pointer;
  border: 1px solid transparent;
}
.btn-primary { background: var(--green-main); color: #fff; border-color: var(--green-dark); }
.btn-primary:hover { background: var(--green-dark); text-decoration: none; color: #fff; }
.btn-danger { background: var(--purple-600); color: #fff; border-color: #6d28d9; }
.btn-danger:hover { background: #6d28d9; text-decoration: none; color: #fff; }
.btn-full { width: 100%; text-align: center; }

/* ── Tables ── */
.table-wrap { overflow-x: auto; border: 1px solid var(--gray-200); border-radius: var(--radius-lg); margin-bottom: 16px; box-shadow: var(--shadow-xs); }
.table-wrap table { width: 100%; border-collapse: collapse; font-size: .86rem; }
.table-wrap th { background: var(--green-main); color: #fff; padding: 9px 12px; text-align: left; font-weight: 600; font-size: .82rem; }
.table-wrap td { padding: 9px 12px; border-bottom: 1px solid var(--gray-200); }
.table-wrap tr:last-child td { border-bottom: none; }
.table-wrap tr:nth-child(even) td { background: var(--gray-50); }
.table-wrap tr:hover td { background: var(--green-light); }

/* ── Highlight boxes ── */
.highlight-box { border-radius: var(--radius); padding: 12px 16px; margin-bottom: 14px; font-size: .88rem; }
.highlight-green  { background: var(--green-light); border-left: 4px solid var(--green-main); color: var(--green-dark); }
.highlight-yellow { background: #fffbeb; border-left: 4px solid #f59e0b; color: #78350f; }
.highlight-blue   { background: #eff6ff; border-left: 4px solid #3b82f6; color: #1e40af; }

/* ── Section heading ── */
.section-heading {
  font-size: 1.1rem;
  color: var(--gray-800);
  padding: 6px 0 6px 12px;
  border-left: 4px solid var(--green-main);
  margin: 20px 0 12px;
}

/* ── Stat grid ── */
.stat-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(130px,1fr)); gap: 10px; margin-bottom: 16px; }
.stat-card { background: #fff; border: 1px solid var(--gray-200); border-top: 2px solid var(--green-main); border-radius: var(--radius); padding: 14px 12px; text-align: center; }
.stat-card .stat-num { font-size: 1.4rem; font-weight: 800; color: var(--green-main); line-height: 1; }
.stat-card .stat-label { font-size: .72rem; color: var(--gray-400); margin-top: 4px; }

/* ── Feature grid ── */
.feature-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(170px,1fr)); gap: 12px; margin-bottom: 16px; }
.feature-card { background: #fff; border: 1px solid var(--gray-200); border-radius: var(--radius-lg); padding: 18px 14px; text-align: center; }
.feature-icon { font-size: 1.6rem; margin-bottom: 7px; }
.feature-card h3 { font-size: .9rem; margin-bottom: 5px; color: var(--gray-800); }
.feature-card p { font-size: .78rem; color: var(--gray-400); }

/* ── Link cards ── */
.link-cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px,1fr)); gap: 10px; margin-bottom: 16px; }
.link-card { background: #fff; border: 1px solid var(--gray-200); border-left: 3px solid var(--green-main); border-radius: var(--radius); padding: 12px 14px; display: block; text-decoration: none; transition: background .12s, box-shadow .12s; }
.link-card:hover { background: var(--green-light); box-shadow: var(--shadow-sm); text-decoration: none; }
.link-card.purple { border-left-color: var(--purple-600); }
.link-card.purple:hover { background: #f5f3ff; }
.link-card .lc-title { font-weight: 600; color: var(--gray-800); font-size: .86rem; margin-bottom: 3px; }
.link-card .lc-desc { font-size: .76rem; color: var(--gray-400); }

/* ── CTA Box ── */
.cta-box { background: var(--green-main); border-radius: var(--radius-lg); padding: 26px 28px; color: #fff; text-align: center; margin-bottom: 20px; }
.cta-box h2 { color: #fff; font-size: 1.1rem; margin-bottom: 8px; }
.cta-box p { opacity: .88; margin-bottom: 16px; font-size: .88rem; }
.btn-cta { background: var(--yellow); color: var(--gray-800); padding: 10px 24px; border-radius: var(--radius); font-weight: 700; text-decoration: none; display: inline-block; font-size: .92rem; transition: background .15s, transform .15s; }
.btn-cta:hover { background: #fbbf24; transform: translateY(-1px); text-decoration: none; color: var(--gray-800); }

/* ── Amazon Affiliate Box ── */
.amzn-box { background: #fff8f0; border: 1px solid #ffd9a0; border-radius: var(--radius-lg); padding: 18px 20px; margin: 24px 0; }
.amzn-box h3 { font-size: .95rem; color: #b45309; margin-bottom: 4px; }
.amzn-disclosure { font-size: .72rem; color: var(--gray-400); margin-bottom: 12px; }
.amzn-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px,1fr)); gap: 10px; }
.amzn-card { background: #fff; border: 1px solid var(--gray-200); border-radius: var(--radius); padding: 12px 14px; text-decoration: none; display: block; transition: box-shadow .12s, transform .12s; }
.amzn-card:hover { box-shadow: var(--shadow-sm); transform: translateY(-1px); text-decoration: none; }
.amzn-card .amzn-name { font-weight: 600; color: var(--gray-800); font-size: .85rem; margin-bottom: 3px; }
.amzn-card .amzn-desc { font-size: .74rem; color: var(--gray-400); margin-bottom: 8px; }
.amzn-card .amzn-link { font-size: .78rem; font-weight: 700; color: #b45309; }

/* ── Steps ── */
.steps { display: flex; flex-direction: column; gap: 8px; margin-bottom: 16px; }
.step { display: flex; gap: 12px; align-items: flex-start; background: #fff; border: 1px solid var(--gray-200); border-radius: var(--radius-lg); padding: 12px 16px; }
.step-num { min-width: 28px; height: 28px; background: var(--green-main); color: #fff; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-weight: 700; font-size: .8rem; flex-shrink: 0; }
.step-body h3 { font-size: .9rem; margin-bottom: 2px; }
.step-body p { font-size: .8rem; color: var(--gray-500); margin: 0; }

/* ── FAQ ── */
.faq-list details { border-bottom: 1px solid var(--gray-200); }
.faq-list details:first-child { border-top: 1px solid var(--gray-200); }
.faq-list summary { padding: 11px 0 11px 24px; cursor: pointer; font-weight: 600; color: var(--gray-700); list-style: none; position: relative; user-select: none; font-size: .88rem; }
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary::before { content: "Q"; position: absolute; left: 0; top: 11px; width: 16px; height: 16px; background: var(--green-main); color: #fff; font-size: .62rem; font-weight: 700; border-radius: 3px; display: flex; align-items: center; justify-content: center; line-height: 16px; text-align: center; }
.faq-list details[open] summary { color: var(--green-dark); }
.faq-list details p { padding: 0 0 12px 24px; font-size: .86rem; color: var(--gray-600); line-height: 1.8; }

/* ── Quiz UI ── */
.page-header { background: var(--green-main); color: #fff; padding: 24px 24px; border-radius: var(--radius-lg); margin-bottom: 16px; }
.page-header h1 { color: #fff; font-size: 1.3rem; margin-bottom: 4px; }
.page-header p { opacity: .88; font-size: .86rem; }
.goal-banner { background: #fff; border: 2px solid var(--green-main); border-radius: var(--radius-lg); padding: 10px 16px; margin-bottom: 14px; display: flex; align-items: center; gap: 8px; font-weight: 600; color: var(--green-dark); font-size: .86rem; }
.category-tabs { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 14px; }
.tab-btn { padding: 6px 14px; border-radius: 4px; border: 1px solid var(--gray-300); background: #fff; cursor: pointer; font-size: .82rem; font-weight: 500; color: var(--gray-500); transition: all .12s; }
.tab-btn:hover { border-color: var(--green-main); color: var(--green-main); }
.tab-btn.active { background: var(--green-main); color: #fff; border-color: var(--green-main); }
.score-display { background: #fff; border: 1px solid var(--gray-200); border-radius: var(--radius); padding: 10px 16px; margin-bottom: 14px; display: flex; align-items: center; gap: 10px; font-size: .86rem; color: var(--gray-500); }
.score-num { font-size: 1.2rem; font-weight: 800; color: var(--green-main); }
.score-label { font-size: .82rem; }
.quiz-container { display: flex; flex-direction: column; gap: 14px; }
.quiz-card { background: #fff; border: 1px solid var(--gray-200); border-radius: var(--radius-lg); padding: 20px; box-shadow: var(--shadow-xs); }
.quiz-number { display: inline-block; background: var(--green-main); color: #fff; font-size: .7rem; font-weight: 700; padding: 2px 8px; border-radius: 3px; margin-bottom: 8px; }
.quiz-question { font-size: .92rem; font-weight: 600; color: var(--gray-800); margin-bottom: 12px; line-height: 1.6; }
.options { display: flex; flex-direction: column; gap: 6px; }
.option-btn { padding: 10px 12px; border: 1px solid var(--gray-200); border-radius: var(--radius); background: #fff; cursor: pointer; text-align: left; font-size: .86rem; font-family: var(--font); color: var(--gray-700); transition: all .12s; line-height: 1.5; }
.option-btn:hover:not(:disabled) { border-color: var(--green-main); background: var(--green-light); color: var(--green-dark); }
.option-btn.correct { border-color: #16a34a; background: #f0fdf4; color: #14532d; }
.option-btn.wrong { border-color: var(--red-600); background: #fef2f2; color: #7f1d1d; }
.option-btn:disabled { cursor: default; }
.show-answer-btn { margin-top: 8px; padding: 6px 12px; background: var(--gray-100); border: 1px solid var(--gray-300); border-radius: var(--radius-sm); cursor: pointer; font-size: .8rem; font-family: var(--font); color: var(--gray-500); transition: background .12s; }
.show-answer-btn:hover { background: var(--gray-200); }
.answer-area { margin-top: 10px; padding: 12px 14px; background: var(--green-light); border: 1px solid var(--green-border); border-radius: var(--radius); font-size: .84rem; display: none; }
.answer-area.show { display: block; }
.answer-label { font-weight: 700; color: var(--green-dark); margin-bottom: 6px; }
.explanation { font-size: .86rem; color: var(--gray-700); line-height: 1.8; margin-top: 10px; padding: 10px 14px; background: var(--green-light); border-left: 3px solid var(--green-main); border-radius: var(--radius-sm); }
.answer-area .explanation { display: block; }

/* ── Article ── */
.article-container { max-width: 760px; margin: 0 auto; }
.article-container h2 { font-size: 1.1rem; padding-left: 12px; border-left: 4px solid var(--green-main); margin: 24px 0 10px; color: var(--gray-800); }
.article-container h3 { font-size: .98rem; margin: 16px 0 8px; color: var(--gray-700); }
.article-container p { margin-bottom: 10px; font-size: .9rem; color: var(--gray-600); }
.article-container ul, .article-container ol { padding-left: 18px; margin-bottom: 10px; }
.article-container li { font-size: .9rem; color: var(--gray-600); margin-bottom: 4px; }
.updated-tag { display: inline-block; background: var(--green-light); color: var(--green-dark); border: 1px solid var(--green-border); padding: 2px 10px; border-radius: 3px; font-size: .75rem; font-weight: 600; margin-bottom: 14px; }

/* ── Footer ── */
footer {
  background: var(--green-nav);
  color: rgba(255,255,255,.6);
  text-align: center;
  padding: 28px 20px;
  font-size: .8rem;
  line-height: 2;
  margin-top: 40px;
}
.footer-links { display: flex; flex-wrap: wrap; justify-content: center; gap: 14px; margin-bottom: 8px; }
.footer-links a { color: rgba(255,255,255,.75); text-decoration: none; }
.footer-links a:hover { color: #fff; }

/* ── Responsive ── */
@media (max-width: 768px) {
  .card { padding: 16px; }
  .global-nav a { padding: 8px 12px; font-size: .8rem; }
}
@media (max-width: 600px) {
  .grade-cards { grid-template-columns: 1fr; }
  .stat-grid { grid-template-columns: repeat(2, 1fr); }
  .feature-grid { grid-template-columns: 1fr 1fr; }
  .page-wrap { padding: 12px 12px 40px; }
  .dojo-logo-text { font-size: 2rem; }
  .header-inner { padding: 8px 12px; }
}


/* ── Pagination ── */
.pagination {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  margin: 24px 0 8px;
  flex-wrap: wrap;
}
.page-btn {
  padding: 8px 16px;
  border: 1.5px solid var(--gray-300);
  border-radius: var(--radius);
  background: #fff;
  cursor: pointer;
  font-size: .88rem;
  font-weight: 600;
  font-family: var(--font);
  color: var(--gray-600);
  transition: all .15s;
}
.page-btn:hover:not(:disabled) { border-color: var(--green-main); color: var(--green-main); }
.page-btn:disabled { opacity: .35; cursor: default; }
.page-btn.active { background: var(--green-main); color: #fff; border-color: var(--green-main); }
.page-info { font-size: .88rem; color: var(--gray-500); font-weight: 500; padding: 0 4px; }
.page-dots { font-size:.9rem; color:var(--gray-400); padding:0 2px; user-select:none; }