/* ============================================================
   Lesson detail pages (de12 / digi_fab の各回ページ)
   de34/01〜07 のページ内スタイルと同じ見た目を共通化したもの。
   common.css の後に読み込む。
   ============================================================ */

.lesson-meta { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-top: 1rem; }
.lesson-meta span { display: inline-flex; align-items: center; padding: 4px 12px; border-radius: 999px; background: var(--accent-soft); color: var(--accent); font-size: 0.75rem; font-weight: 600; letter-spacing: 0.04em; }

.toc { display: grid; gap: 0.5rem; margin: 1.5rem 0 0; }
.toc a { display: flex; align-items: center; gap: 0.75rem; padding: 12px 16px; border-radius: var(--radius-md); background: var(--bg-soft); border: 1px solid var(--line); color: var(--text); font-size: 0.9rem; font-weight: 500; transition: all 0.2s ease; }
.toc a:hover { background: var(--surface); transform: translateX(4px); }
.toc a .num { font-weight: 700; color: var(--accent); font-variant-numeric: tabular-nums; min-width: 1.75rem; }

.lesson-section { margin-top: 2rem; }
.lesson-section h2 { font-size: 1.35rem; font-weight: 700; color: var(--text); margin-bottom: 0.25rem; letter-spacing: 0.02em; }
.lesson-section h2 .chapter-num { display: inline-block; margin-right: 0.6rem; padding: 2px 10px; border-radius: 999px; background: var(--accent); color: #fff; font-size: 0.7rem; font-weight: 700; vertical-align: middle; letter-spacing: 0.08em; }
.lesson-section h3 { font-size: 1rem; font-weight: 600; color: var(--text); margin: 1.5rem 0 0.5rem; }
.lesson-section p { font-size: 0.92rem; line-height: 1.85; color: var(--text-muted); margin: 0.5rem 0; }
.lesson-section ul, .lesson-section ol { margin: 0.75rem 0 0.75rem 1.25rem; color: var(--text-muted); font-size: 0.9rem; line-height: 1.85; }
.lesson-section ul { list-style: disc; }
.lesson-section ol { list-style: decimal; }
.lesson-section li { margin: 0.3rem 0; }
.lesson-section strong { color: var(--text); font-weight: 600; }
.lesson-section a:not(.source-link):not(.app-cta) { color: var(--accent); text-decoration: underline; text-underline-offset: 3px; }

.callout { margin: 1rem 0; padding: 1rem 1.25rem; border-left: 3px solid var(--accent); background: var(--accent-soft); border-radius: 0 var(--radius-md) var(--radius-md) 0; font-size: 0.88rem; line-height: 1.75; color: var(--text); }
.callout .callout-label { display: block; font-size: 0.7rem; font-weight: 700; letter-spacing: 0.12em; color: var(--accent); margin-bottom: 0.35rem; text-transform: uppercase; }

pre.code { margin: 1rem 0; padding: 1.1rem 1.25rem; background: #1a1a2e; color: #e8e8f0; border-radius: var(--radius-md); font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', monospace; font-size: 0.82rem; line-height: 1.7; overflow-x: auto; border: 1px solid rgba(255,255,255,0.04); }
pre.code .c-key { color: #c4a7ff; }
pre.code .c-fn { color: #8ae2ff; }
pre.code .c-num { color: #ffb86c; }
pre.code .c-str { color: #a5e3a1; }
pre.code .c-cmt { color: #6b6b80; font-style: italic; }

.source-link { display: inline-flex; align-items: center; gap: 0.4rem; margin-top: 0.75rem; padding: 6px 14px; border-radius: 999px; border: 1px solid var(--line); background: var(--bg-soft); color: var(--text-muted); font-size: 0.78rem; font-weight: 500; transition: all 0.2s ease; }
.source-link:hover { background: var(--surface); color: var(--accent); }
.source-link::after { content: "↗"; font-size: 0.9rem; }

.summary-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 0.75rem; margin: 1rem 0; }
.summary-card { padding: 1rem 1.1rem; border-radius: var(--radius-md); background: var(--bg-soft); border: 1px solid var(--line); }
.summary-card h4 { font-size: 0.78rem; font-weight: 700; color: var(--accent); letter-spacing: 0.08em; text-transform: uppercase; margin-bottom: 0.4rem; }
.summary-card p { font-size: 0.85rem; color: var(--text); line-height: 1.7; margin: 0; }
.summary-card .stat { font-size: 1.6rem; font-weight: 700; color: var(--text); font-variant-numeric: tabular-nums; letter-spacing: -0.01em; }

.pager { display: flex; justify-content: space-between; gap: 1rem; margin-top: 3rem; padding-top: 1.5rem; border-top: 1px solid var(--line); }
.pager a { display: inline-flex; align-items: center; gap: 0.4rem; padding: 10px 18px; border-radius: 999px; background: var(--bg-soft); border: 1px solid var(--line); color: var(--text); font-size: 0.85rem; font-weight: 600; transition: all 0.25s ease; }
.pager a:hover { background: var(--surface); transform: translateY(-2px); }

/* ---- 追加コンポーネント ---- */
.lesson-figure { margin: 1rem 0; }
.lesson-figure img { display: block; width: 100%; height: auto; border-radius: var(--radius-md); border: 1px solid var(--line); background: var(--bg-soft); }
.lesson-figure figcaption { margin-top: 0.5rem; font-size: 0.8rem; line-height: 1.6; color: var(--text-muted); }
.lesson-figure figcaption strong { display: block; color: var(--text); font-size: 0.85rem; margin-bottom: 0.15rem; }
.lesson-figure.is-narrow { max-width: 480px; }
.lesson-figure.is-light img { background: #fff; }

.figure-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1rem; margin: 1rem 0; }
.figure-grid .lesson-figure { margin: 0; }
@media (max-width: 640px) { .figure-grid { grid-template-columns: 1fr; } }

.video { position: relative; margin: 1rem 0; aspect-ratio: 16 / 9; border-radius: var(--radius-md); overflow: hidden; border: 1px solid var(--line); background: #000; }
.video iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; }

.app-cta { display: inline-flex; align-items: center; gap: 0.5rem; margin-top: 1rem; padding: 12px 22px; border-radius: 999px; background: var(--accent); color: #fff; font-size: 0.88rem; font-weight: 600; transition: transform 0.2s ease, filter 0.2s ease; }
.app-cta:hover { transform: translateY(-2px); filter: brightness(1.08); }
.app-cta::after { content: "↗"; }

.flow { display: grid; gap: 0.35rem; margin: 1rem 0; max-width: 420px; }
.flow .flow-step { padding: 0.75rem 1rem; border-radius: var(--radius-md); background: var(--bg-soft); border: 1px solid var(--line); color: var(--text); font-size: 0.9rem; font-weight: 600; text-align: center; }
.flow .flow-arrow { text-align: center; color: var(--accent); font-size: 1rem; line-height: 1; }

.demo { margin: 0.75rem 0 1rem; padding: 1rem 1.25rem; border-radius: var(--radius-md); border: 1px dashed var(--line); background: var(--surface); color: var(--text); font-size: 0.9rem; line-height: 1.8; }
.demo .demo-label { display: block; margin-bottom: 0.5rem; font-size: 0.7rem; font-weight: 700; letter-spacing: 0.12em; color: var(--text-muted); text-transform: uppercase; }
.demo h1, .demo h2, .demo h3 { margin: 0.25rem 0; font-weight: 700; color: var(--text); }
.demo h1 { font-size: 1.8rem; }
.demo h2 { font-size: 1.4rem; }
.demo h3 { font-size: 1.1rem; }
.demo ol { list-style: decimal; margin-left: 1.25rem; }
.demo ul { list-style: disc; margin-left: 1.25rem; }