/* ===== リセット・基本 ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --primary:   #1a5276;   /* 濃紺 */
  --primary-lt:#2980b9;
  --bg:        #f4f6f8;
  --white:     #ffffff;
  --border:    #cfd8e3;
  --text:      #2c3e50;
  --text-sub:  #5d6d7e;

  /* フェーズカラー */
  --phase-a:   #1a5276;  /* 技術基礎 */
  --phase-b:   #145a32;  /* 課題設計 */
  --phase-c:   #784212;  /* 開発・改善 */
  --phase-d:   #4a235a;  /* 発表・共有 */
  --phase-e:   #641e16;  /* 省察・倫理 */

  --phase-a-lt:#d6eaf8;
  --phase-b-lt:#d5f5e3;
  --phase-c-lt:#fdebd0;
  --phase-d-lt:#e8daef;
  --phase-e-lt:#fadbd8;

  /* ルーブリック列 */
  --lv4: #1a5276; --lv4-bg: #d6eaf8;
  --lv3: #1e8449; --lv3-bg: #d5f5e3;
  --lv2: #b7770d; --lv2-bg: #fef9e7;
  --lv1: #922b21; --lv1-bg: #fadbd8;
}

html { scroll-behavior: smooth; }

body {
  font-family: "Hiragino Kaku Gothic ProN", "Meiryo", "Yu Gothic", sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: 15px;
  line-height: 1.7;
}

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 20px;
}

/* ===== ヘッダー ===== */
.site-header {
  background: var(--primary);
  color: var(--white);
  padding: 28px 0 22px;
  border-bottom: 4px solid var(--primary-lt);
}
.subject-label {
  font-size: 13px;
  letter-spacing: .08em;
  opacity: .85;
  margin-bottom: 4px;
}
.site-title {
  font-size: 26px;
  font-weight: 700;
  letter-spacing: .04em;
  margin-bottom: 6px;
}
.unit-name {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 2px;
}
.material-name {
  font-size: 13px;
  opacity: .85;
}

/* ===== タブナビ ===== */
.tab-nav {
  background: var(--white);
  border-bottom: 2px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 6px rgba(0,0,0,.08);
}
.tab-nav .container {
  display: flex;
  gap: 0;
}
.tab-btn {
  padding: 14px 28px;
  font-size: 14px;
  font-weight: 600;
  border: none;
  background: transparent;
  color: var(--text-sub);
  cursor: pointer;
  border-bottom: 3px solid transparent;
  transition: all .2s;
  letter-spacing: .03em;
}
.tab-btn:hover { color: var(--primary); background: var(--phase-a-lt); }
.tab-btn.active {
  color: var(--primary);
  border-bottom-color: var(--primary);
  background: transparent;
}

/* ===== メインコンテンツ ===== */
.main-content { padding: 36px 20px 60px; }

.tab-content { display: none; }
.tab-content.active { display: block; }

/* ===== セクション見出し ===== */
.section-title {
  font-size: 22px;
  font-weight: 700;
  color: var(--primary);
  border-left: 5px solid var(--primary);
  padding-left: 14px;
  margin-bottom: 6px;
}
.subsection-title {
  font-size: 17px;
  font-weight: 700;
  color: var(--primary);
  margin: 28px 0 12px;
  padding-bottom: 6px;
  border-bottom: 2px solid var(--border);
}
.section-note {
  font-size: 13px;
  color: var(--text-sub);
  margin-bottom: 24px;
}

/* ===== 単元概要：情報テーブル ===== */
.info-card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
  margin-top: 16px;
}
.info-table { width: 100%; border-collapse: collapse; }
.info-table th, .info-table td {
  padding: 12px 16px;
  text-align: left;
  border-bottom: 1px solid var(--border);
}
.info-table th {
  width: 140px;
  background: var(--phase-a-lt);
  color: var(--primary);
  font-weight: 700;
  font-size: 13px;
}
.info-table tr:last-child th,
.info-table tr:last-child td { border-bottom: none; }

/* ===== フェーズグリッド ===== */
.phase-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(190px, 1fr));
  gap: 14px;
  margin-bottom: 10px;
}
.phase-card {
  border-radius: 8px;
  padding: 16px 14px;
  border-top: 5px solid;
}
.phase-card.phase-a { border-color: var(--phase-a); background: var(--phase-a-lt); }
.phase-card.phase-b { border-color: var(--phase-b); background: var(--phase-b-lt); }
.phase-card.phase-c { border-color: var(--phase-c); background: var(--phase-c-lt); }
.phase-card.phase-d { border-color: var(--phase-d); background: var(--phase-d-lt); }
.phase-card.phase-e { border-color: var(--phase-e); background: var(--phase-e-lt); }
.phase-label {
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .06em;
  opacity: .75;
  margin-bottom: 2px;
}
.phase-sessions {
  font-size: 13px;
  font-weight: 700;
  margin-bottom: 4px;
}
.phase-name {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 6px;
}
.phase-desc {
  font-size: 12px;
  line-height: 1.55;
  opacity: .85;
}

/* ===== 評価基準カード ===== */
.eval-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 16px;
  margin-bottom: 10px;
}
.eval-card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 18px 16px;
}
.eval-icon { font-size: 26px; margin-bottom: 8px; }
.eval-title {
  font-size: 15px;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 8px;
  padding-bottom: 6px;
  border-bottom: 2px solid var(--border);
}
.eval-body { font-size: 13.5px; line-height: 1.75; color: var(--text); }

/* ===== 4段階説明テーブル ===== */
.level-table-wrap { overflow-x: auto; }
.level-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
  background: var(--white);
  border-radius: 8px;
  overflow: hidden;
  border: 1px solid var(--border);
}
.level-table th, .level-table td {
  padding: 12px 14px;
  text-align: center;
  border: 1px solid var(--border);
}
.level-4 { background: var(--lv4); color: var(--white); }
.level-3 { background: var(--lv3); color: var(--white); }
.level-2 { background: var(--lv2); color: var(--white); }
.level-1 { background: var(--lv1); color: var(--white); }

/* ===== 授業一覧 ===== */
.phase-heading {
  font-size: 16px;
  font-weight: 700;
  padding: 10px 16px;
  border-radius: 6px;
  margin: 28px 0 10px;
  letter-spacing: .03em;
}
.phase-a-heading { background: var(--phase-a); color: #fff; }
.phase-b-heading { background: var(--phase-b); color: #fff; }
.phase-c-heading { background: var(--phase-c); color: #fff; }
.phase-d-heading { background: var(--phase-d); color: #fff; }
.phase-e-heading { background: var(--phase-e); color: #fff; }

.lesson-cards { display: flex; flex-direction: column; gap: 10px; }

.lesson-card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
  border-left: 5px solid;
}
.lesson-card.phase-a { border-left-color: var(--phase-a); }
.lesson-card.phase-b { border-left-color: var(--phase-b); }
.lesson-card.phase-c { border-left-color: var(--phase-c); }
.lesson-card.phase-d { border-left-color: var(--phase-d); }
.lesson-card.phase-e { border-left-color: var(--phase-e); }

.lesson-header {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  cursor: pointer;
  user-select: none;
  transition: background .15s;
}
.lesson-header:hover { background: var(--bg); }

.lesson-num {
  font-size: 12px;
  font-weight: 700;
  color: var(--text-sub);
  white-space: nowrap;
  min-width: 70px;
}
.lesson-title-text {
  font-size: 15px;
  font-weight: 700;
  flex: 1;
  color: var(--text);
}
.toggle-icon {
  font-size: 12px;
  color: var(--text-sub);
  transition: transform .25s;
}
.toggle-icon.open { transform: rotate(180deg); }

.lesson-body {
  padding: 0 16px 16px;
  border-top: 1px solid var(--border);
  display: none;
}
.lesson-body.open { display: block; }
.lesson-body.always-open { display: block; }

.lesson-goal {
  font-size: 13.5px;
  padding: 10px 0 10px;
  color: var(--text);
}

.lesson-design { display: flex; flex-direction: column; gap: 8px; }

.design-block {
  border-radius: 6px;
  padding: 10px 14px;
  font-size: 13px;
  line-height: 1.65;
}
.intro-block  { background: #eaf4fb; border-left: 4px solid #2980b9; }
.dev-block    { background: #fdfefe; border-left: 4px solid #1e8449; }
.close-block  { background: #fef9e7; border-left: 4px solid #b7770d; }

.design-label {
  display: inline-block;
  font-size: 12px;
  font-weight: 700;
  margin-right: 8px;
  min-width: 70px;
  color: var(--text-sub);
}
.cycle-note {
  font-size: 12px;
  color: var(--text-sub);
  margin-top: 10px;
  font-style: italic;
}

/* ===== 完全版ルーブリック ===== */
.rubric-block {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
  margin-bottom: 20px;
  border-left: 5px solid;
}
.phase-a-block { border-left-color: var(--phase-a); }
.phase-b-block { border-left-color: var(--phase-b); }
.phase-c-block { border-left-color: var(--phase-c); }
.phase-d-block { border-left-color: var(--phase-d); }
.phase-e-block { border-left-color: var(--phase-e); }

.rubric-title {
  font-size: 15px;
  font-weight: 700;
  padding: 12px 16px;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}
.lesson-badge {
  font-size: 12px;
  font-weight: 700;
  color: #fff;
  padding: 3px 10px;
  border-radius: 12px;
  white-space: nowrap;
}
.phase-a-badge { background: var(--phase-a); }
.phase-b-badge { background: var(--phase-b); }
.phase-c-badge { background: var(--phase-c); }
.phase-d-badge { background: var(--phase-d); }
.phase-e-badge { background: var(--phase-e); }

.rubric-table-wrap { overflow-x: auto; padding: 0 2px 2px; }

.rubric-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}
.rubric-table th, .rubric-table td {
  padding: 10px 12px;
  border: 1px solid var(--border);
  vertical-align: top;
  line-height: 1.6;
}
.col-view { width: 120px; font-weight: 700; background: #f0f4f8; color: var(--primary); white-space: nowrap; }
.col-4 { background: var(--lv4); color: #fff; font-weight: 700; text-align: center; width: 40px; }
.col-3 { background: var(--lv3); color: #fff; font-weight: 700; text-align: center; width: 40px; }
.col-2 { background: var(--lv2); color: #fff; font-weight: 700; text-align: center; width: 40px; }
.col-1 { background: var(--lv1); color: #fff; font-weight: 700; text-align: center; width: 40px; }

.rubric-table tbody td:nth-child(2) { background: var(--lv4-bg); }
.rubric-table tbody td:nth-child(3) { background: var(--lv3-bg); }
.rubric-table tbody td:nth-child(4) { background: var(--lv2-bg); }
.rubric-table tbody td:nth-child(5) { background: var(--lv1-bg); }

.view-label {
  font-weight: 700;
  font-size: 12px;
  color: var(--primary);
  white-space: nowrap;
  vertical-align: middle !important;
}

/* ===== フッター ===== */
.site-footer {
  background: var(--primary);
  color: rgba(255,255,255,.75);
  padding: 18px 0;
  font-size: 13px;
  text-align: center;
  margin-top: 40px;
}

/* ===== フローティングボタン ===== */
.floating-btns {
  position: fixed;
  bottom: 28px;
  right: 24px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  z-index: 200;
}
.float-btn {
  width: 46px;
  height: 46px;
  border-radius: 50%;
  border: none;
  background: var(--primary);
  color: #fff;
  font-size: 18px;
  cursor: pointer;
  box-shadow: 0 3px 10px rgba(0,0,0,.25);
  transition: background .2s, transform .15s;
  display: flex;
  align-items: center;
  justify-content: center;
}
.float-btn:hover { background: var(--primary-lt); transform: scale(1.08); }

/* ===== 印刷 ===== */
@media print {
  .tab-nav, .floating-btns, .site-footer { display: none; }
  .tab-content { display: block !important; }
  .lesson-body { display: block !important; }
  .rubric-table-wrap { overflow: visible; }
  .site-header { background: #1a5276 !important; -webkit-print-color-adjust: exact; print-color-adjust: exact; }
}

/* ===== レスポンシブ ===== */
@media (max-width: 760px) {
  .site-title { font-size: 20px; }
  .tab-btn { padding: 12px 14px; font-size: 13px; }
  .phase-grid { grid-template-columns: 1fr 1fr; }
  .eval-grid { grid-template-columns: 1fr; }
  .rubric-table { font-size: 12px; }
  .rubric-table th, .rubric-table td { padding: 8px 8px; }
  .col-view { width: 80px; font-size: 11px; }
}
@media (max-width: 480px) {
  .phase-grid { grid-template-columns: 1fr; }
  .tab-btn { padding: 10px 10px; font-size: 12px; }
}