/* =================================================================
 * NetChai Original Text — Introductory Course (入門コース)
 * Design: E — NetChai v2 Brand Integrated (Blue #0078d7 + Pink #f57db4)
 *   - Same font sizes as F7/F10 (intermediate course)
 *   - Visual language matches NetChai website
 * Variable names retain --F-* (compatible with existing HTML inline styles).
 * ================================================================= */

*{box-sizing:border-box}
html,body{margin:0;padding:0;background:#eef2f8;min-height:100vh;-webkit-font-smoothing:antialiased}
ruby rt{font-weight:500;letter-spacing:.04em}

/* ── E ブランドカラー（変数名は F* を継承） ── */
.page{
  --F-ink:#1f2533;
  --F-paper:#ffffff;
  --F-magenta:#0078d7;          /* primary = NetChai blue */
  --F-magenta-deep:#005ea6;
  --F-pink:#f57db4;             /* secondary accent = NetChai pink */
  --F-pink-soft:#fde2ee;
  --F-mute:#6b7280;
  --F-rule:#e5e7eb;
  --F-card:#ffffff;
  --F-soft:#f4f7fb;             /* light blue tint */
  --F-japanese:#374151;
  font-family:"Hiragino Kaku Gothic ProN","ヒラギノ角ゴ ProN W3",Meiryo,sans-serif;
  color:var(--F-ink);background:var(--F-paper);
  max-width:880px;margin:32px auto;
  box-shadow:0 18px 48px rgba(0,120,215,.18);border-radius:16px;overflow:hidden;
  letter-spacing:.01em;
}

/* ── ヘッダー（ブルー→ピンク グラデーション） ── */
.f-head{
  position:relative;overflow:hidden;
  display:grid;grid-template-columns:1fr 1fr;padding:36px 44px 30px;gap:24px;
  background:linear-gradient(120deg,#0078d7 0%,#3aa0e8 55%,#f57db4 130%);
  color:#fff;border-bottom:none;
}
.f-head::after{
  content:"";position:absolute;right:-60px;bottom:-80px;width:280px;height:280px;border-radius:50%;
  background:radial-gradient(circle,rgba(255,255,255,.22),transparent 70%);pointer-events:none;
}
.f-head>*{position:relative;z-index:1}
.f-head .left .kicker{
  font-family:"Inter","Source Sans 3","Segoe UI",sans-serif;font-size:14px;letter-spacing:.28em;color:#fff;opacity:.92;font-weight:700;text-transform:uppercase;
  display:inline-block;background:rgba(255,255,255,.18);padding:5px 12px;border-radius:999px;backdrop-filter:blur(6px);
}
.f-head .left h1{margin:18px 0 0;font-size:46px;font-weight:900;letter-spacing:.04em;line-height:1.2;color:#fff}
.f-head .right{
  align-self:end;text-align:right;color:#fff;opacity:.96;
  font-family:"Inter","Source Sans 3","Segoe UI",sans-serif;font-size:15.5px;letter-spacing:.12em;line-height:1.9;font-weight:600;
}
.f-head .right .vol{
  display:inline-block;background:#fff;color:var(--F-magenta);font-weight:900;font-size:22px;letter-spacing:.04em;padding:6px 14px;border-radius:8px;margin-bottom:10px;
  box-shadow:0 3px 8px rgba(0,0,0,.15);
}

.f-body{padding:20px 44px 36px;background:#fff}

/* ── 大見出し（番号バッジ＋グラデーションバンド） ── */
h2.f-h{
  position:relative;margin:36px 0 20px;
  display:flex;align-items:center;gap:18px;
  padding:14px 20px 14px 22px;
  background:linear-gradient(90deg,var(--F-soft),transparent 78%);
  border-left:5px solid var(--F-magenta);
  border-radius:0 14px 14px 0;border-bottom:none;
}
h2.f-h .num{
  display:inline-flex;align-items:center;justify-content:center;
  background:var(--F-magenta);color:#fff;
  min-width:54px;height:54px;border-radius:12px;
  font-family:"Inter",sans-serif;font-weight:900;font-size:28px;line-height:1;letter-spacing:0;
  box-shadow:0 6px 14px rgba(0,120,215,.3);
}
h2.f-h .t{font-size:22px;font-weight:900;letter-spacing:.08em;color:var(--F-magenta-deep)}
h2.f-h .en{
  margin-left:auto;font-family:"Inter","Source Sans 3","Segoe UI",sans-serif;font-size:18px;letter-spacing:.2em;
  color:var(--F-mute);text-transform:uppercase;font-weight:800;
}

/* ── 01 新しい単語 ── */
.f-tbl{column-count:2;column-gap:30px;margin-top:6px}
.f-tbl .w{break-inside:avoid;display:grid;grid-template-columns:26px 1fr;gap:10px;padding:9px 0;border-bottom:1px solid var(--F-rule)}
.f-tbl .w .n{font-family:"Inter",sans-serif;font-weight:900;color:var(--F-pink);font-size:15px;padding-top:6px;font-variant-numeric:tabular-nums}
.f-tbl .w .body .h{display:flex;align-items:baseline;gap:10px;flex-wrap:wrap}
.f-tbl .w .body .han{font-size:25px;font-weight:900;color:var(--F-magenta-deep)}
.f-tbl .w .body .pos{
  display:inline-block;font-size:11.5px;color:var(--F-magenta);background:var(--F-soft);
  font-weight:700;padding:2px 10px;border-radius:999px;letter-spacing:.04em;
}
.f-tbl .w .body .pinyin{font-family:"Source Sans 3","Source Sans Pro","Inter","Segoe UI","Helvetica Neue",Arial,sans-serif;color:var(--F-magenta);font-size:22px;font-weight:500;display:block;margin-top:0;letter-spacing:.01em;font-style:italic}
.f-tbl .w .body .ja{font-size:18px;color:var(--F-japanese);margin-top:5px;line-height:1.7}

/* ── 02 固有名詞 ── */
.f-pn{display:grid;grid-template-columns:repeat(2,1fr);gap:14px 30px;margin-top:8px}
.f-pn .item{display:grid;grid-template-columns:26px 1fr;gap:10px;padding:10px 0;border-bottom:1px solid var(--F-rule)}
.f-pn .item .n{font-family:"Inter",sans-serif;font-weight:900;color:var(--F-pink);font-size:15px;padding-top:6px}
.f-pn .item .han{font-size:25px;font-weight:900;color:var(--F-magenta-deep)}
.f-pn .item .pinyin{font-family:"Source Sans 3","Source Sans Pro","Inter","Segoe UI","Helvetica Neue",Arial,sans-serif;color:var(--F-magenta);font-size:22px;font-weight:500;display:block;margin-top:0;letter-spacing:.01em;font-style:italic}
.f-pn .item .meaning{font-size:18px;color:var(--F-japanese);margin-top:6px;line-height:1.75}
.f-pn .item .meaning .desc{display:block;color:var(--F-mute);font-size:15.5px;margin-bottom:3px;font-style:italic}

/* ── 03 重要文型 ── */
.f-ex{display:grid;gap:10px;margin-top:6px}
.f-ex .item{
  display:grid;grid-template-columns:30px 1fr 1fr;gap:18px;
  padding:14px 18px;align-items:center;
  background:var(--F-soft);border-radius:12px;
  border-left:4px solid var(--F-pink);
}
.f-ex .item .n{
  background:var(--F-magenta);color:#fff;font-weight:900;
  width:26px;height:26px;border-radius:50%;text-align:center;line-height:26px;
  font-family:"Inter",sans-serif;font-size:13px;font-variant-numeric:tabular-nums;
}
.f-ex .item .zh{font-size:23px;font-weight:700;letter-spacing:.03em;line-height:2;color:var(--F-ink)}
.f-ex .item .zh ruby rt{color:var(--F-pink);font-size:15.5px;font-weight:500;font-family:"Source Sans 3","Source Sans Pro","Inter","Segoe UI","Helvetica Neue",Arial,sans-serif;letter-spacing:.01em}
.f-ex .item .ja{align-self:center;font-size:19px;color:var(--F-japanese);line-height:1.75}

/* ── 04 本文 ── */
.f-dia{
  background:#fff;border:1px solid var(--F-rule);border-radius:16px;
  padding:18px 26px;margin-bottom:14px;
  box-shadow:0 4px 14px rgba(0,120,215,.06);
}
.f-dia .scene-no{
  display:inline-block;font-family:"Inter","Source Sans 3","Segoe UI",sans-serif;font-weight:900;font-size:15px;letter-spacing:.2em;
  background:linear-gradient(90deg,var(--F-magenta),#3aa0e8);color:#fff;padding:8px 20px;
  border-radius:999px;margin:4px 0 14px;
  box-shadow:0 4px 10px rgba(0,120,215,.28);
}
.f-dia .turn{display:grid;grid-template-columns:150px 1fr;gap:20px;padding:14px 0;border-bottom:1px dashed var(--F-rule);align-items:start}
.f-dia .turn:last-child{border-bottom:0}
.f-dia .turn .who{
  font-family:"Source Sans 3","Inter","Segoe UI",sans-serif;font-weight:600;font-size:18px;letter-spacing:.02em;
  color:var(--F-magenta-deep);background:var(--F-soft);
  padding:8px 14px;border-radius:999px;text-align:center;align-self:start;margin-top:6px;
}
.f-dia .turn .who .ja{
  display:block;font-family:"Hiragino Kaku Gothic ProN",sans-serif;font-size:14.5px;
  color:var(--F-magenta-deep);font-weight:800;letter-spacing:.04em;margin-top:2px;
}
.f-dia .turn .zh{font-size:24px;font-weight:700;line-height:2;color:var(--F-ink)}
.f-dia .turn .zh ruby rt{color:var(--F-pink);font-size:18px;font-weight:500;font-family:"Source Sans 3","Source Sans Pro","Inter","Segoe UI","Helvetica Neue",Arial,sans-serif;letter-spacing:.01em}

/* ── 05 文法カード ── */
.f-gr-card{
  position:relative;background:var(--F-pink-soft);color:var(--F-ink);
  padding:24px 26px 22px;margin-top:24px;border-radius:14px;
  display:grid;grid-template-columns:auto 1fr;gap:22px;
}
.f-gr-card::before{
  content:"文法ポイント";position:absolute;top:-14px;left:22px;
  background:var(--F-pink);color:#fff;font-weight:900;font-size:12px;letter-spacing:.2em;
  padding:6px 14px;border-radius:999px;
  box-shadow:0 4px 10px rgba(245,125,180,.4);
}
.f-gr-card .tag{
  background:var(--F-magenta);color:#fff;font-weight:900;font-size:11px;
  letter-spacing:.25em;padding:8px 12px;align-self:start;height:fit-content;border-radius:8px;
}
.f-gr-card h3{margin:6px 0 10px;font-size:18px;font-weight:900;letter-spacing:.04em;color:#a04574}
.f-gr-card p{margin:0 0 6px;font-size:17px;line-height:1.95;color:var(--F-japanese)}
.f-gr-card .note{color:#7a3057;font-size:16px;font-style:italic;margin-top:12px;font-weight:700}
.f-gr-card .examples{margin:14px 0 0;padding-left:42px;list-style:none}
.f-gr-card .examples li{
  position:relative;font-size:23px;padding:12px 0;line-height:1.95;color:var(--F-ink);font-weight:700;
}
.f-gr-card .examples li::before{
  content:attr(data-no);position:absolute;left:-38px;top:10px;color:var(--F-pink);
  font-family:"Hiragino Kaku Gothic ProN","Yu Gothic UI",Meiryo,sans-serif;font-weight:900;font-size:24px;
}
.f-gr-card .examples li ruby rt{color:var(--F-pink);font-size:17px;font-weight:500;font-family:"Source Sans 3","Source Sans Pro","Inter","Segoe UI","Helvetica Neue",Arial,sans-serif;letter-spacing:.01em}

/* ── 06 本文訳文 ── */
.f-tr-block{margin:18px 0 22px;padding:14px 18px;background:var(--F-soft);border-radius:12px;border-bottom:none}
.f-tr-block:last-child{margin-bottom:8px}
.f-tr-block h4{
  margin:0 0 12px;font-family:"Hiragino Kaku Gothic ProN",sans-serif;
  color:var(--F-magenta-deep);font-size:20px;font-weight:900;letter-spacing:.05em;
  padding-bottom:8px;border-bottom:2px solid var(--F-pink);
}
.f-tr-block .line{display:grid;grid-template-columns:100px 1fr;gap:14px;padding:8px 0;font-size:17.5px;line-height:1.85}
.f-tr-block .line .who{color:var(--F-magenta);font-weight:800;letter-spacing:.05em}
.f-tr-block .line .text{color:var(--F-japanese)}

/* ── フッター ── */
.f-foot{
  padding:22px 44px;background:var(--F-soft);border-top:1px solid var(--F-rule);
  font-family:"Inter","Source Sans 3","Segoe UI",sans-serif;font-size:14.5px;color:var(--F-mute);
  display:flex;justify-content:space-between;letter-spacing:.1em;font-weight:600;
}
.f-foot strong{color:var(--F-magenta);letter-spacing:.04em;font-weight:900}

/* ── 印刷用 ── */
@media print{
  body{background:#fff}
  .page{margin:0;box-shadow:none;border-radius:0;max-width:none;width:100%}
  h2.f-h{page-break-after:avoid}
  .f-tr-block,.f-gr-card,.f-dia{page-break-inside:avoid}
}

@media (max-width:760px){
  .page{margin:0;border-radius:0}
  .f-head{grid-template-columns:1fr}
  .f-head .right{text-align:left}
  .f-tbl{column-count:1}
  .f-pn{grid-template-columns:1fr}
  .f-ex .item{grid-template-columns:1fr;gap:8px}
  .f-gr-card{grid-template-columns:1fr}
  .f-dia .turn{grid-template-columns:1fr}
  .f-vocab,.f-phrase{grid-template-columns:1fr}
}

/* =================================================================
 * 中級互換セクション
 *   - .f-vocab    重要単語
 *   - .f-phrase   慣用フレーズ
 *   - .f-q-list   質問
 *   - .f-p-list   練習
 * ================================================================= */

/* ── 重要単語 ── */
.f-vocab{display:grid;grid-template-columns:repeat(2,1fr);gap:14px 30px;margin-top:8px}
.f-vocab .item{display:grid;grid-template-columns:26px 1fr;gap:10px;padding:10px 0;border-bottom:1px solid var(--F-rule)}
.f-vocab .item .n{font-family:"Inter",sans-serif;font-weight:900;color:var(--F-pink);font-size:15px;padding-top:6px}
.f-vocab .item .han{font-size:25px;font-weight:900;color:var(--F-magenta-deep)}
.f-vocab .item .pinyin{font-family:"Source Sans 3","Source Sans Pro","Inter","Segoe UI","Helvetica Neue",Arial,sans-serif;color:var(--F-magenta);font-size:22px;font-weight:500;display:block;margin-top:2px;letter-spacing:.01em;font-style:italic}
.f-vocab .item .meaning{font-size:18px;color:var(--F-japanese);margin-top:5px;line-height:1.7}

/* ── 慣用フレーズ ── */
.f-phrase{display:grid;gap:10px;margin-top:6px}
.f-phrase .item{
  display:grid;grid-template-columns:38px 1fr;gap:18px;padding:16px 18px;
  background:var(--F-soft);border-radius:12px;border-left:4px solid var(--F-pink);
}
.f-phrase .item .n{
  font-family:"Inter",sans-serif;font-weight:900;color:#fff;font-size:18px;
  background:var(--F-magenta);
  width:32px;height:32px;border-radius:50%;text-align:center;line-height:32px;
  align-self:start;margin-top:4px;
}
.f-phrase .item .body .zh{font-size:24px;font-weight:700;line-height:2;color:var(--F-ink);letter-spacing:.03em}
.f-phrase .item .body .zh ruby rt{color:var(--F-pink);font-size:17px;font-weight:500;font-family:"Source Sans 3","Source Sans Pro","Inter","Segoe UI","Helvetica Neue",Arial,sans-serif;letter-spacing:.01em}
.f-phrase .item .body .ja{margin-top:8px;font-size:19px;color:var(--F-japanese);padding-left:14px;border-left:3px solid var(--F-magenta);line-height:1.75}

/* ── 質問・練習 ── */
.f-q-list,.f-p-list{
  margin:14px 0 6px;background:var(--F-pink-soft);
  border-radius:14px;padding:24px 28px;list-style:none;position:relative;
}
.f-q-list::before,.f-p-list::before{
  content:attr(data-label);position:absolute;top:-12px;left:22px;
  background:var(--F-pink);color:#fff;font-weight:900;font-size:11px;letter-spacing:.2em;
  padding:6px 12px;border-radius:999px;
  box-shadow:0 4px 10px rgba(245,125,180,.4);
}
.f-q-list li,.f-p-list li{
  position:relative;font-size:24px;padding:14px 0 14px 46px;line-height:1.95;color:var(--F-ink);font-weight:700;letter-spacing:.03em;
  border-bottom:1px dashed rgba(245,125,180,.4);
}
.f-q-list li:last-child,.f-p-list li:last-child{border-bottom:0}
.f-q-list li::before,.f-p-list li::before{
  content:attr(data-no);position:absolute;left:0;top:14px;color:var(--F-magenta);
  font-family:"Hiragino Kaku Gothic ProN","Yu Gothic UI",Meiryo,sans-serif;font-weight:900;font-size:26px;
}
.f-q-list li ruby rt,.f-p-list li ruby rt{color:var(--F-pink);font-size:17px;font-weight:500;font-family:"Source Sans 3","Source Sans Pro","Inter","Segoe UI","Helvetica Neue",Arial,sans-serif;letter-spacing:.01em}
.f-q-list li .ex{display:block;color:#7a3057;font-size:17px;margin-top:8px;font-style:italic;font-weight:600;line-height:1.7}
.f-q-list li .ex ruby rt{color:#7a3057;font-weight:700}

/* === レッスンナビ（前の課/目次/次の課・2026-05-30 追加） === */
.f-nav{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:14px 44px;background:var(--F-paper)}
.f-nav.top{border-bottom:1px solid var(--F-rule)}
.f-nav.bottom{border-top:1px solid var(--F-rule)}
.f-nav a,.f-nav .disabled{
  font-family:"Inter","Source Sans 3","Segoe UI",sans-serif;
  font-size:14px;font-weight:800;letter-spacing:.04em;text-decoration:none;
  padding:8px 16px;border-radius:4px;white-space:nowrap;transition:background .12s,color .12s;
}
.f-nav .prev,.f-nav .next{color:var(--F-ink);border:1.5px solid var(--F-ink);background:#fff}
.f-nav .prev:hover,.f-nav .next:hover{background:var(--F-ink);color:#fff}
.f-nav .toc{color:#fff;background:var(--F-magenta);border:1.5px solid var(--F-magenta)}
.f-nav .toc:hover{filter:brightness(.92)}
.f-nav .disabled{color:#aeb6bf;border:1.5px solid #d8dde3;background:#f3f4f6;cursor:default}
@media print{ .f-nav{display:none} }
@media (max-width:600px){
  .f-nav{padding:12px 16px;gap:6px}
  .f-nav a,.f-nav .disabled{padding:7px 10px;font-size:12.5px}
}