/* ===================================
   教育のための紙面編集 マスタープラン
   Main Stylesheet
=================================== */

/* ---------- 変数・リセット ---------- */
:root {
  --color-primary:    #1a3a5c;
  --color-primary-lt: #2b5d93;
  --color-accent:     #e8792a;
  --color-accent2:    #3aaa8a;
  --color-bg:         #f5f7fa;
  --color-surface:    #ffffff;
  --color-text:       #1e2b3a;
  --color-text-sub:   #5c7080;
  --color-border:     #dde3ec;

  /* グレード色 */
  --grade-s-bg:   #fef6e0;
  --grade-s-bdr:  #f5a623;
  --grade-s-text: #8a5a00;
  --grade-a-bg:   #e8f4fd;
  --grade-a-bdr:  #2196f3;
  --grade-a-text: #0d47a1;
  --grade-b-bg:   #f0f9f4;
  --grade-b-bdr:  #4caf50;
  --grade-b-text: #1b5e20;
  --grade-c-bg:   #fef3f3;
  --grade-c-bdr:  #ef5350;
  --grade-c-text: #b71c1c;

  /* セッション色（回別カラー） */
  --s1: #3f5185;
  --s2: #5b3f85;
  --s3: #855b3f;
  --s4: #3f8580;
  --s5: #3f7d85;
  --s6: #855d3f;
  --s7: #3f6585;

  --radius: 12px;
  --shadow: 0 2px 12px rgba(0,0,0,.08);
  --shadow-md: 0 4px 24px rgba(0,0,0,.12);
  --transition: .25s ease;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: 'Noto Sans JP', sans-serif;
  font-size: 15px;
  line-height: 1.75;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- ヘッダー ---------- */
.site-header {
  position: relative;
  background: linear-gradient(135deg, var(--color-primary) 0%, #0e2a4a 60%, #1a4870 100%);
  color: #fff;
  padding: 64px 0 56px;
  overflow: hidden;
}

.header-bg {
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(circle at 10% 20%, rgba(255,255,255,.04) 0%, transparent 50%),
    radial-gradient(circle at 85% 70%, rgba(232,121,42,.12) 0%, transparent 50%);
  pointer-events: none;
}

.header-badge {
  display: inline-block;
  background: rgba(255,255,255,.15);
  border: 1px solid rgba(255,255,255,.25);
  border-radius: 50px;
  padding: 4px 16px;
  font-size: 12px;
  font-weight: 500;
  letter-spacing: .08em;
  margin-bottom: 20px;
  backdrop-filter: blur(4px);
}

.site-title {
  font-family: 'Noto Serif JP', serif;
  font-size: clamp(26px, 4vw, 40px);
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: .04em;
  margin-bottom: 12px;
}

.site-subtitle {
  font-size: clamp(16px, 2.5vw, 22px);
  font-weight: 400;
  opacity: .85;
  margin-bottom: 16px;
}

.site-subtitle .highlight {
  display: inline-block;
  background: var(--color-accent);
  color: #fff;
  border-radius: 6px;
  padding: 2px 10px;
  font-weight: 700;
  font-size: .9em;
}

.site-description {
  font-size: 14px;
  opacity: .7;
  max-width: 600px;
  margin-bottom: 32px;
  line-height: 1.8;
}

.header-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

.stat-item {
  display: flex;
  align-items: center;
  gap: 8px;
  background: rgba(255,255,255,.12);
  border: 1px solid rgba(255,255,255,.2);
  border-radius: 8px;
  padding: 8px 16px;
  font-size: 13px;
  font-weight: 500;
  backdrop-filter: blur(4px);
}

.stat-item i {
  color: var(--color-accent);
  font-size: 14px;
}

/* ---------- スティッキーナビ ---------- */
.sticky-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-primary);
  box-shadow: 0 2px 8px rgba(0,0,0,.18);
}

.nav-inner {
  display: flex;
  align-items: center;
  gap: 4px;
  overflow-x: auto;
  padding: 0 4px;
  scrollbar-width: none;
}
.nav-inner::-webkit-scrollbar { display: none; }

.nav-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: rgba(255,255,255,.75);
  text-decoration: none;
  padding: 12px 14px;
  font-size: 13px;
  font-weight: 500;
  white-space: nowrap;
  border-bottom: 3px solid transparent;
  transition: var(--transition);
}

.nav-link:hover,
.nav-link.active {
  color: #fff;
  border-bottom-color: var(--color-accent);
}

/* ---------- メインコンテンツ共通 ---------- */
.main-content {
  padding: 48px 0 80px;
}

.section {
  margin-bottom: 60px;
}

/* ---------- 時間配分セクション ---------- */
.common-section {
  background: var(--color-surface);
  border-radius: var(--radius);
  padding: 40px;
  box-shadow: var(--shadow);
  border: 1px solid var(--color-border);
}

.section-header {
  display: flex;
  align-items: flex-start;
  gap: 20px;
  margin-bottom: 32px;
}

.section-icon {
  width: 52px;
  height: 52px;
  min-width: 52px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-lt));
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 20px;
  box-shadow: 0 4px 12px rgba(26,58,92,.3);
}

.section-title {
  font-family: 'Noto Serif JP', serif;
  font-size: 22px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 6px;
}

.section-desc {
  font-size: 14px;
  color: var(--color-text-sub);
  line-height: 1.7;
}

/* 時間フロー */
.time-flow {
  display: flex;
  align-items: stretch;
  gap: 0;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
}

.time-block {
  flex: 1;
  padding: 28px 24px;
  text-align: center;
  transition: var(--transition);
}

.time-block:hover { filter: brightness(1.05); }

.time-block.intro    { background: linear-gradient(145deg, #e8f0fd, #d5e5f9); border-top: 4px solid #3f72c8; }
.time-block.activity { background: linear-gradient(145deg, #fdf3e8, #f9e2c8); border-top: 4px solid var(--color-accent); }
.time-block.reflection { background: linear-gradient(145deg, #e8fdf5, #c8f2e2); border-top: 4px solid var(--color-accent2); }

.time-arrow {
  display: flex;
  align-items: center;
  padding: 0 8px;
  color: var(--color-text-sub);
  font-size: 18px;
  background: var(--color-bg);
}

.time-range {
  font-size: 14px;
  font-weight: 700;
  color: var(--color-primary);
  background: rgba(255,255,255,.6);
  display: inline-block;
  padding: 3px 12px;
  border-radius: 20px;
  margin-bottom: 10px;
  font-family: monospace;
  letter-spacing: .04em;
}

.time-phase {
  font-size: 17px;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 8px;
}

.time-detail {
  font-size: 13px;
  color: var(--color-text-sub);
  line-height: 1.6;
}

/* ---------- セッション一覧カード ---------- */
.sessions-overview {
  margin-bottom: 56px;
}

.overview-title {
  font-family: 'Noto Serif JP', serif;
  font-size: 18px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 20px;
  padding-left: 14px;
  border-left: 4px solid var(--color-accent);
}

.session-cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: 12px;
}

.session-card-link {
  text-decoration: none;
  display: block;
}

.session-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 10px;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  transition: var(--transition);
  box-shadow: var(--shadow);
}

.session-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-color: var(--color-primary);
}

.session-card-link:nth-child(1) .session-number { color: var(--s1); border-color: var(--s1); }
.session-card-link:nth-child(2) .session-number { color: var(--s2); border-color: var(--s2); }
.session-card-link:nth-child(3) .session-number { color: var(--s3); border-color: var(--s3); }
.session-card-link:nth-child(4) .session-number { color: var(--s4); border-color: var(--s4); }
.session-card-link:nth-child(5) .session-number { color: var(--s5); border-color: var(--s5); }
.session-card-link:nth-child(6) .session-number { color: var(--s6); border-color: var(--s6); }
.session-card-link:nth-child(7) .session-number { color: var(--s7); border-color: var(--s7); }

.session-number {
  font-size: 28px;
  font-weight: 900;
  line-height: 1;
  border-bottom: 2px solid;
  padding-bottom: 8px;
  margin-bottom: 4px;
  font-family: 'Noto Serif JP', serif;
}

.session-theme {
  font-size: 11px;
  color: var(--color-text-sub);
  line-height: 1.4;
}

.session-name {
  font-size: 13px;
  font-weight: 700;
  color: var(--color-text);
  line-height: 1.4;
}

/* ---------- セッションセクション ---------- */
.session-section {
  background: var(--color-surface);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  border: 1px solid var(--color-border);
  margin-bottom: 48px;
  scroll-margin-top: 56px;
}

.session-section[data-session="1"] { border-top: 5px solid var(--s1); }
.session-section[data-session="2"] { border-top: 5px solid var(--s2); }
.session-section[data-session="3"] { border-top: 5px solid var(--s3); }
.session-section[data-session="4"] { border-top: 5px solid var(--s4); }
.session-section[data-session="5"] { border-top: 5px solid var(--s5); }
.session-section[data-session="6"] { border-top: 5px solid var(--s6); }
.session-section[data-session="7"] { border-top: 5px solid var(--s7); }

.session-header {
  display: flex;
  align-items: center;
  gap: 20px;
  padding: 28px 32px 24px;
  background: linear-gradient(to right, var(--color-bg), transparent);
  border-bottom: 1px solid var(--color-border);
}

.session-num-badge {
  background: var(--color-primary);
  color: #fff;
  padding: 8px 18px;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .06em;
  white-space: nowrap;
  box-shadow: 0 3px 8px rgba(26,58,92,.25);
}

.session-section[data-session="1"] .session-num-badge { background: var(--s1); }
.session-section[data-session="2"] .session-num-badge { background: var(--s2); }
.session-section[data-session="3"] .session-num-badge { background: var(--s3); }
.session-section[data-session="4"] .session-num-badge { background: var(--s4); }
.session-section[data-session="5"] .session-num-badge { background: var(--s5); }
.session-section[data-session="6"] .session-num-badge { background: var(--s6); }
.session-section[data-session="7"] .session-num-badge { background: var(--s7); }

.session-main-title {
  font-family: 'Noto Serif JP', serif;
  font-size: clamp(16px, 2.5vw, 22px);
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 4px;
}

.session-keyword {
  font-size: 12px;
  color: var(--color-text-sub);
  font-style: italic;
  letter-spacing: .04em;
}

/* コンテンツグリッド */
.content-grid {
  display: grid;
  grid-template-columns: 1fr 1.3fr;
  gap: 0;
}

.content-left {
  padding: 28px 24px 32px 32px;
  border-right: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.content-right {
  padding: 28px 32px 32px 24px;
}

/* ボックス共通 */
.aim-box, .design-box, .rubric-box {
  border-radius: 10px;
}

.box-title {
  font-size: 14px;
  font-weight: 700;
  color: var(--color-primary);
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 14px;
}

.box-title i {
  color: var(--color-accent);
}

/* ねらいボックス */
.aim-box {
  background: linear-gradient(135deg, #f0f5ff, #e8f0fd);
  border: 1px solid #c8d9f0;
  padding: 20px;
}

.aim-box p {
  font-size: 14px;
  line-height: 1.85;
  color: var(--color-text);
}

.aim-box strong {
  color: var(--color-primary);
  background: rgba(26,58,92,.08);
  padding: 1px 4px;
  border-radius: 4px;
}

/* デザインボックス */
.design-box {
  background: #fafbfc;
  border: 1px solid var(--color-border);
  padding: 20px;
}

.design-steps {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.design-step {
  display: flex;
  gap: 12px;
  align-items: flex-start;
}

.step-badge {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 20px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .06em;
  white-space: nowrap;
  margin-top: 1px;
}

.intro-badge    { background: #dbeafe; color: #1e40af; }
.activity-badge { background: #fde8d1; color: #9a3412; }
.reflection-badge { background: #d1fae5; color: #065f46; }

.design-step p {
  font-size: 13px;
  color: var(--color-text);
  line-height: 1.75;
}

/* ---------- ルーブリック ---------- */
.rubric-tabs {
  display: flex;
  gap: 6px;
  margin-bottom: 16px;
  flex-wrap: wrap;
}

.rubric-tab {
  padding: 7px 16px;
  border: 1px solid var(--color-border);
  border-radius: 20px;
  background: var(--color-bg);
  color: var(--color-text-sub);
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  font-family: 'Noto Sans JP', sans-serif;
}

.rubric-tab:hover {
  background: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
}

.rubric-tab.active {
  background: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
}

.rubric-content {
  display: none;
  flex-direction: column;
  gap: 10px;
}

.rubric-content.active {
  display: flex;
}

.grade-item {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  padding: 14px 16px;
  border-radius: 8px;
  border-left: 4px solid;
}

.grade-item.grade-s {
  background: var(--grade-s-bg);
  border-color: var(--grade-s-bdr);
}
.grade-item.grade-a {
  background: var(--grade-a-bg);
  border-color: var(--grade-a-bdr);
}
.grade-item.grade-b {
  background: var(--grade-b-bg);
  border-color: var(--grade-b-bdr);
}
.grade-item.grade-c {
  background: var(--grade-c-bg);
  border-color: var(--grade-c-bdr);
}

.grade-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  min-width: 30px;
  border-radius: 6px;
  font-size: 15px;
  font-weight: 900;
  font-family: 'Noto Serif JP', serif;
}

.grade-s .grade-badge { background: var(--grade-s-bdr); color: #fff; }
.grade-a .grade-badge { background: var(--grade-a-bdr); color: #fff; }
.grade-b .grade-badge { background: var(--grade-b-bdr); color: #fff; }
.grade-c .grade-badge { background: var(--grade-c-bdr); color: #fff; }

.grade-item p {
  font-size: 13px;
  line-height: 1.75;
  color: var(--color-text);
}

/* ---------- まとめ（カリキュラムフロー） ---------- */
.summary-section {
  margin-top: 16px;
  margin-bottom: 0;
}

.summary-inner {
  background: linear-gradient(135deg, var(--color-primary) 0%, #0e2a4a 100%);
  border-radius: var(--radius);
  padding: 40px;
  color: #fff;
  box-shadow: var(--shadow-md);
}

.summary-title {
  font-family: 'Noto Serif JP', serif;
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 32px;
  display: flex;
  align-items: center;
  gap: 12px;
}

.summary-title i {
  color: var(--color-accent);
}

.curriculum-flow {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
}

.flow-item {
  background: rgba(255,255,255,.1);
  border: 1px solid rgba(255,255,255,.2);
  border-radius: 10px;
  padding: 16px 12px;
  text-align: center;
  flex: 1;
  min-width: 100px;
  transition: var(--transition);
}

.flow-item:hover {
  background: rgba(255,255,255,.18);
  transform: translateY(-2px);
}

.flow-icon {
  font-size: 22px;
  color: var(--color-accent);
  margin-bottom: 8px;
}

.flow-label {
  font-size: 11px;
  font-weight: 700;
  opacity: .65;
  letter-spacing: .1em;
  margin-bottom: 4px;
}

.flow-desc {
  font-size: 12px;
  font-weight: 500;
  line-height: 1.5;
  opacity: .9;
}

.flow-arrow {
  font-size: 18px;
  opacity: .45;
  color: var(--color-accent);
}

/* ---------- フッター ---------- */
.site-footer {
  background: #0e2234;
  color: rgba(255,255,255,.6);
  padding: 28px 0;
  text-align: center;
}

.footer-title {
  font-size: 14px;
  font-weight: 600;
  color: rgba(255,255,255,.85);
  margin-bottom: 6px;
}

.footer-meta {
  font-size: 12px;
  opacity: .55;
}

/* ---------- TOPへ戻るボタン ---------- */
.back-to-top {
  position: fixed;
  bottom: 28px;
  right: 28px;
  z-index: 200;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background: var(--color-primary);
  color: #fff;
  border: none;
  cursor: pointer;
  box-shadow: 0 4px 16px rgba(0,0,0,.2);
  font-size: 16px;
  opacity: 0;
  transform: translateY(12px);
  transition: opacity .3s ease, transform .3s ease;
  pointer-events: none;
}

.back-to-top.visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

.back-to-top:hover {
  background: var(--color-primary-lt);
}

/* =============================
   レスポンシブ対応
============================= */

@media (max-width: 900px) {
  .content-grid {
    grid-template-columns: 1fr;
  }

  .content-left {
    border-right: none;
    border-bottom: 1px solid var(--color-border);
    padding: 24px 24px 24px 24px;
  }

  .content-right {
    padding: 24px 24px 28px 24px;
  }

  .time-flow {
    flex-direction: column;
  }

  .time-arrow {
    transform: rotate(90deg);
    padding: 6px;
    background: transparent;
  }

  .curriculum-flow {
    gap: 6px;
  }

  .flow-item {
    min-width: 80px;
    flex: none;
    width: calc(25% - 6px);
  }
}

@media (max-width: 640px) {
  .site-header { padding: 44px 0 40px; }

  .session-header {
    padding: 20px 20px 16px;
    flex-wrap: wrap;
    gap: 12px;
  }

  .session-cards-grid {
    grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
  }

  .summary-inner { padding: 28px 20px; }

  .common-section { padding: 28px 20px; }

  .flow-item {
    width: calc(33% - 6px);
    padding: 12px 8px;
  }

  .flow-desc { display: none; }

  .header-stats { gap: 10px; }

  .stat-item { padding: 6px 12px; font-size: 12px; }

  .back-to-top {
    bottom: 18px;
    right: 18px;
    width: 40px;
    height: 40px;
  }
}

@media (max-width: 480px) {
  .rubric-tabs {
    flex-direction: column;
    gap: 4px;
  }

  .rubric-tab {
    text-align: center;
  }

  .session-num-badge {
    font-size: 12px;
    padding: 6px 14px;
  }

  .session-main-title {
    font-size: 16px;
  }
}

/* ---------- アニメーション ---------- */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}

.session-section {
  animation: fadeInUp .5s ease both;
}

/* ---------- 印刷対応 ---------- */
@media print {
  .sticky-nav,
  .back-to-top { display: none !important; }

  .session-section {
    break-inside: avoid;
    page-break-inside: avoid;
  }

  .rubric-content { display: flex !important; }
  .rubric-tabs { display: none; }

  body { font-size: 11pt; }

  .site-header {
    background: #1a3a5c !important;
    print-color-adjust: exact;
    -webkit-print-color-adjust: exact;
  }
}