/* パウロ式投資思考 — ビジュアル解説サイト */

:root {
    --bg: #0d1117;
    --surface: #161b22;
    --border: #30363d;
    --text: #e6edf3;
    --text-muted: #8b949e;
    --accent: #58a6ff;
    --green: #3fb950;
    --orange: #d29922;
    --red: #f85149;
    --purple: #bc8cff;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Noto Sans JP', sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.7;
    max-width: 900px;
    margin: 0 auto;
    padding: 2rem 1.5rem;
}

/* ナビゲーション */
.breadcrumb {
    margin-bottom: 2rem;
    color: var(--text-muted);
    font-size: 0.9rem;
}
.breadcrumb a {
    color: var(--accent);
    text-decoration: none;
}

/* ヘッダー */
header {
    margin-bottom: 3rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid var(--border);
}
header h1 {
    font-size: 1.8rem;
    margin-bottom: 0.8rem;
}
.meta {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1rem;
    flex-wrap: wrap;
}
.badge {
    display: inline-block;
    padding: 0.2rem 0.7rem;
    border-radius: 999px;
    font-size: 0.8rem;
    font-weight: 600;
}
.badge.level { background: var(--accent); color: var(--bg); }
.badge.date { background: var(--surface); border: 1px solid var(--border); }
.badge.axes { background: var(--purple); color: var(--bg); }
.summary {
    color: var(--text-muted);
    font-size: 1rem;
}

/* セクション */
section {
    margin-bottom: 3rem;
}
section h2 {
    font-size: 1.4rem;
    margin-bottom: 1.2rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--accent);
}

/* 図解 */
.diagram {
    margin: 1.5rem 0;
    padding: 1.5rem;
    background: var(--surface);
    border-radius: 12px;
    border: 1px solid var(--border);
    text-align: center;
    overflow-x: auto;
}
.diagram img {
    max-width: 100%;
    height: auto;
    min-height: 300px;
}
.diagram.large img {
    min-height: 500px;
    width: 100%;
}

/* コンセプトボックス */
.concept-box {
    margin: 1.5rem 0;
    padding: 1.5rem;
    background: var(--surface);
    border-radius: 12px;
    border-left: 4px solid var(--accent);
}
.concept-box.highlight {
    border-left-color: var(--orange);
}
.concept-box h3 {
    font-size: 1.1rem;
    margin-bottom: 0.8rem;
    color: var(--accent);
}
.concept-box.highlight h3 {
    color: var(--orange);
}
.concept-box p {
    margin-bottom: 0.6rem;
}
.concept-box .insight {
    margin-top: 1rem;
    padding: 0.8rem;
    background: rgba(88, 166, 255, 0.1);
    border-radius: 8px;
    font-weight: 600;
}

/* テーブル */
table {
    width: 100%;
    border-collapse: collapse;
    margin: 1rem 0;
}
th, td {
    padding: 0.6rem 0.8rem;
    text-align: left;
    border-bottom: 1px solid var(--border);
}
th {
    background: rgba(88, 166, 255, 0.1);
    font-weight: 600;
    font-size: 0.9rem;
}

/* コードアナロジー */
.code-analogy {
    margin: 1.5rem 0;
    padding: 1.5rem;
    background: var(--surface);
    border-radius: 12px;
    border-left: 4px solid var(--green);
}
.code-analogy h4 {
    color: var(--green);
    margin-bottom: 0.8rem;
}
pre {
    background: var(--bg);
    padding: 1rem;
    border-radius: 8px;
    overflow-x: auto;
    font-size: 0.9rem;
    line-height: 1.5;
}
code {
    font-family: 'SF Mono', 'Fira Code', monospace;
}

/* 数式ボックス */
.key-equations {
    margin: 1.5rem 0;
    padding: 1.5rem;
    background: var(--surface);
    border-radius: 12px;
    border-left: 4px solid var(--purple);
}
.key-equations h4 {
    color: var(--purple);
    margin-bottom: 0.8rem;
}
.key-equations li {
    margin-bottom: 0.5rem;
    margin-left: 1.5rem;
}

/* 参考文献（控えめ） */
.further-reading {
    margin: 1rem 0 0.5rem;
}
.further-reading summary {
    color: var(--text-muted);
    font-size: 0.85rem;
    cursor: pointer;
    padding: 0.3rem 0;
}
.further-reading summary:hover {
    color: var(--accent);
}
.further-reading ul {
    margin: 0.5rem 0 0 1.2rem;
    font-size: 0.85rem;
    color: var(--text-muted);
}
.further-reading li {
    margin-bottom: 0.4rem;
}
.further-reading a {
    color: var(--text-muted);
    text-decoration: none;
    border-bottom: 1px dotted var(--border);
}
.further-reading a:hover {
    color: var(--accent);
    border-bottom-color: var(--accent);
}

/* クイズ */
.quiz-section {
    background: var(--surface);
    padding: 2rem;
    border-radius: 12px;
    border: 1px solid var(--border);
}
.quiz-item {
    margin-bottom: 1.5rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--border);
}
.quiz-item:last-child {
    margin-bottom: 0;
    padding-bottom: 0;
    border-bottom: none;
}
.question {
    font-weight: 600;
    margin-bottom: 0.5rem;
}
details {
    margin-top: 0.5rem;
}
summary {
    cursor: pointer;
    color: var(--accent);
    font-size: 0.9rem;
}
summary:hover {
    text-decoration: underline;
}
details p {
    margin-top: 0.5rem;
    padding: 0.8rem;
    background: rgba(63, 185, 80, 0.1);
    border-radius: 8px;
    border-left: 3px solid var(--green);
}

/* フッター */
footer {
    margin-top: 3rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border);
    color: var(--text-muted);
    font-size: 0.85rem;
    text-align: center;
}

/* ===== 樹形図（HTML版） ===== */
.tree-diagram {
    margin: 1.5rem 0;
    padding: 2rem;
    background: var(--surface);
    border-radius: 12px;
    border: 1px solid var(--border);
}
.tree-root {
    text-align: center;
    font-size: 1.3rem;
    font-weight: 700;
    padding: 1rem 1.5rem;
    background: #1565C0;
    color: #fff;
    border-radius: 10px;
    margin-bottom: 2rem;
}
.tree-branches {
    display: flex;
    gap: 1.5rem;
}
.tree-branch {
    flex: 1;
    min-width: 0;
}
.tree-category {
    text-align: center;
    font-size: 1.05rem;
    font-weight: 700;
    padding: 0.8rem;
    border-radius: 8px;
    margin-bottom: 1rem;
    line-height: 1.5;
}
.tree-branch.logic .tree-category { background: #2196F3; color: #fff; }
.tree-branch.memory .tree-category { background: #FF9800; color: #fff; }
.tree-branch.analog .tree-category { background: #9C27B0; color: #fff; }

.tree-leaves {
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
}
.tree-leaf {
    padding: 0.7rem 0.9rem;
    background: var(--bg);
    border-radius: 8px;
    border-left: 4px solid;
    font-size: 0.95rem;
    line-height: 1.5;
}
.tree-leaf strong {
    font-size: 1.05rem;
}
.leaf-full {
    display: block;
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-bottom: 0.2rem;
}

/* ===== チップ比較カード ===== */
.chip-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1rem;
    margin: 1.5rem 0;
}
.chip-card {
    background: var(--surface);
    border-radius: 12px;
    border: 2px solid;
    overflow: hidden;
}
.chip-card-header {
    padding: 0.7rem 1rem;
    font-size: 1.4rem;
    font-weight: 800;
    color: #fff;
    text-align: center;
    letter-spacing: 0.05em;
}
.chip-card-subtitle {
    text-align: center;
    font-size: 0.8rem;
    color: var(--text-muted);
    padding: 0.4rem 1rem 0;
}
.chip-card-body {
    padding: 0.8rem 1rem 1rem;
}
.chip-card-desc {
    margin-bottom: 0.6rem;
    font-size: 0.95rem;
    line-height: 1.5;
}
.chip-card-stars {
    display: flex;
    flex-direction: column;
    gap: 0.2rem;
    font-size: 0.9rem;
    margin-bottom: 0.6rem;
    color: var(--orange);
}
.chip-card-examples {
    font-size: 0.8rem;
    color: var(--text-muted);
    padding-top: 0.5rem;
    border-top: 1px solid var(--border);
}

/* ===== 断面図カード（物理構造ページ） ===== */
.structure-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.2rem;
    margin: 1.5rem 0;
}
.structure-card {
    background: var(--surface);
    border-radius: 12px;
    overflow: hidden;
    border: 1px solid var(--border);
}
.structure-card-header {
    padding: 0.7rem 1rem;
    font-size: 1.1rem;
    font-weight: 700;
    color: #fff;
    text-align: center;
}
.structure-card-body {
    padding: 1rem;
}

/* 断面図ビジュアル */
.cross-section {
    border: 2px solid;
    border-radius: 8px;
    overflow: hidden;
    margin-bottom: 1rem;
}
.cs-layer {
    padding: 0.5rem 0.7rem;
    text-align: center;
    font-size: 0.85rem;
    line-height: 1.4;
}
.cs-divider {
    text-align: center;
    font-size: 0.7rem;
    color: var(--text-muted);
    padding: 0.2rem;
    background: rgba(255,255,255,0.03);
}

/* レイヤー種別 */
.cs-layer.wiring {
    background: rgba(33, 150, 243, 0.15);
    border-bottom: 1px solid rgba(33, 150, 243, 0.2);
    color: #90CAF9;
    font-size: 0.8rem;
    padding: 0.35rem 0.7rem;
}
.cs-layer.transistor {
    background: rgba(63, 185, 80, 0.2);
    color: var(--green);
    font-weight: 600;
    padding: 0.6rem 0.7rem;
}
.cs-layer.substrate {
    background: rgba(139, 148, 158, 0.15);
    color: var(--text-muted);
    font-size: 0.8rem;
}

/* DRAM キャパシタ */
.cs-layer.capacitor {
    background: rgba(255, 152, 0, 0.12);
    padding: 0.8rem 0.7rem;
    color: var(--orange);
    line-height: 1.5;
}
.capacitor-visual {
    display: flex;
    justify-content: center;
    gap: 0.8rem;
    margin-bottom: 0.5rem;
}
.cap-pillar {
    display: inline-block;
    font-size: 1.8rem;
    line-height: 1;
    color: var(--orange);
    font-weight: 700;
}

/* NAND スタック */
.cs-layer.nand-stack {
    background: rgba(76, 175, 80, 0.1);
    padding: 0.8rem 0.7rem;
    color: #81C784;
    line-height: 1.5;
}
.nand-layers {
    display: flex;
    flex-direction: column;
    gap: 0.15rem;
    margin-bottom: 0.5rem;
}
.nand-row {
    text-align: center;
    font-size: 0.75rem;
    padding: 0.15rem 0;
    background: rgba(76, 175, 80, 0.15);
    border-radius: 3px;
    color: #A5D6A7;
}
.channel-holes {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    font-size: 1.2rem;
    margin: 0.4rem 0;
    color: #81C784;
}

/* 核心ポイント */
.structure-point {
    font-size: 0.9rem;
    line-height: 1.6;
}
.structure-point p {
    margin: 0;
}

/* ===== パッケージング断面図（Lesson 4） ===== */
.package-diagram {
    margin: 1.5rem 0;
    padding: 2rem;
    background: var(--surface);
    border-radius: 12px;
    border: 1px solid var(--border);
}
.package-title {
    text-align: center;
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    color: var(--accent);
}
.package-stack {
    max-width: 600px;
    margin: 0 auto;
}
.package-chips-row {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
    margin-bottom: 0.3rem;
}
.pkg-chip {
    padding: 0.6rem 1rem;
    border-radius: 6px;
    font-weight: 700;
    font-size: 0.9rem;
    text-align: center;
}
.gpu-chip { background: #2196F3; color: #fff; flex: 2; }
.hbm-chip { background: #FF9800; color: #fff; flex: 1; }
.package-connector {
    text-align: center;
    font-size: 0.75rem;
    color: var(--text-muted);
    padding: 0.3rem 0;
}
.package-layer {
    padding: 0.8rem 1rem;
    border-radius: 6px;
    text-align: center;
    font-size: 0.85rem;
    line-height: 1.5;
    margin-bottom: 0.3rem;
}
.interposer {
    background: rgba(156, 39, 176, 0.2);
    border: 2px solid #9C27B0;
    color: #CE93D8;
}
.substrate-layer {
    background: rgba(229, 57, 53, 0.15);
    border: 1px solid rgba(229, 57, 53, 0.4);
    color: #EF9A9A;
}
.motherboard-layer {
    background: rgba(139, 148, 158, 0.15);
    color: var(--text-muted);
}

/* ===== パッケージング比較カード ===== */
.pkg-comparison {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.2rem;
    margin: 1.5rem 0;
}
.pkg-card {
    background: var(--surface);
    border-radius: 12px;
    overflow: hidden;
    border: 1px solid var(--border);
}
.pkg-card-header {
    padding: 0.7rem 1rem;
    font-size: 1.1rem;
    font-weight: 700;
    color: #fff;
    text-align: center;
}
.pkg-card-body { padding: 1rem; }
.pkg-card-tech {
    text-align: center;
    font-weight: 600;
    color: var(--accent);
    margin-bottom: 0.8rem;
    font-size: 0.95rem;
}
.pkg-card-visual {
    display: flex;
    justify-content: center;
    gap: 0.3rem;
    margin-bottom: 1rem;
    flex-wrap: wrap;
}
.pkg-block {
    padding: 0.4rem 0.6rem;
    border-radius: 4px;
    font-size: 0.8rem;
    font-weight: 600;
}
.gpu-block { background: #2196F3; color: #fff; }
.hbm-block { background: #FF9800; color: #fff; }
.tsv-stack {
    display: flex;
    flex-direction: column;
    gap: 0.15rem;
    width: 120px;
}
.tsv-layer {
    display: block;
    text-align: center;
    font-size: 0.75rem;
    padding: 0.2rem;
    background: rgba(255, 152, 0, 0.2);
    border-radius: 3px;
    color: var(--orange);
}
.pkg-card-desc { font-size: 0.9rem; line-height: 1.6; }
.pkg-card-desc p { margin-bottom: 0.4rem; }

/* ===== 素材カード ===== */
.material-cards {
    display: flex;
    flex-direction: column;
    gap: 1.2rem;
    margin: 1.5rem 0;
}
.material-card {
    background: var(--surface);
    border-radius: 12px;
    overflow: hidden;
    border: 1px solid var(--border);
}
.material-card-header {
    padding: 0.7rem 1rem;
    font-size: 1.1rem;
    font-weight: 700;
    color: #fff;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}
.material-icon { font-size: 1.3rem; }
.material-card-body { padding: 1rem; }
.material-desc {
    font-size: 0.95rem;
    margin-bottom: 0.8rem;
    line-height: 1.6;
}
.material-share { margin-top: 1rem; }
.share-bar {
    display: flex;
    border-radius: 6px;
    overflow: hidden;
    height: 28px;
    margin-bottom: 0.5rem;
}
.share-segment {
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.7rem;
    font-weight: 600;
    color: #fff;
    white-space: nowrap;
    overflow: hidden;
    padding: 0 0.3rem;
}
.share-note {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--orange);
}

/* ===== ビニング図 ===== */
.binning-diagram {
    margin: 1.5rem 0;
    padding: 2rem;
    background: var(--surface);
    border-radius: 12px;
    border: 1px solid var(--border);
}
.binning-title {
    text-align: center;
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    color: var(--accent);
}
.binning-flow {
    display: flex;
    align-items: center;
    gap: 1rem;
}
.binning-source {
    padding: 1rem;
    background: var(--bg);
    border-radius: 8px;
    text-align: center;
    font-size: 0.9rem;
    min-width: 100px;
    border: 1px solid var(--border);
}
.binning-arrow {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--accent);
    text-align: center;
    min-width: 50px;
}
.binning-ranks {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    flex: 1;
}
.binning-rank {
    padding: 0.6rem 1rem;
    border-radius: 8px;
    font-size: 0.85rem;
    line-height: 1.4;
}
.s-rank { background: rgba(63, 185, 80, 0.15); border-left: 4px solid var(--green); }
.a-rank { background: rgba(88, 166, 255, 0.1); border-left: 4px solid var(--accent); }
.b-rank { background: rgba(210, 153, 34, 0.15); border-left: 4px solid var(--orange); }
.fail-rank { background: rgba(248, 81, 73, 0.15); border-left: 4px solid var(--red); }

/* ===== ネットワーク距離図 ===== */
.network-distance {
    margin: 1.5rem 0;
    padding: 2rem;
    background: var(--surface);
    border-radius: 12px;
    border: 1px solid var(--border);
}
.net-title {
    text-align: center;
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    color: var(--accent);
}
.net-layers {
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
}
.net-layer {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0.8rem 1rem;
    background: var(--bg);
    border-radius: 8px;
    border-left: 4px solid;
}
.net-distance {
    min-width: 80px;
    font-weight: 700;
    font-size: 0.95rem;
    color: var(--text);
}
.net-info { font-size: 0.9rem; line-height: 1.5; }
.net-method {
    display: inline-block;
    margin-top: 0.2rem;
    padding: 0.1rem 0.5rem;
    background: rgba(88, 166, 255, 0.1);
    border-radius: 4px;
    font-size: 0.8rem;
    color: var(--accent);
}
.net-company {
    display: block;
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-top: 0.2rem;
}

/* ===== バリューチェーン全体図 ===== */
.value-chain-complete {
    margin: 1.5rem 0;
    padding: 2rem;
    background: var(--surface);
    border-radius: 12px;
    border: 1px solid var(--border);
    overflow-x: auto;
}
.vc-title {
    text-align: center;
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    color: var(--accent);
}
.vc-flow {
    display: flex;
    align-items: stretch;
    gap: 0;
    min-width: 800px;
}
.vc-node {
    flex: 1;
    min-width: 0;
    border-radius: 8px;
    overflow: hidden;
    border: 1px solid var(--border);
    background: var(--bg);
}
.vc-node-header {
    padding: 0.4rem 0.3rem;
    font-size: 0.8rem;
    font-weight: 700;
    color: #fff;
    text-align: center;
}
.vc-node-body {
    padding: 0.5rem 0.3rem;
    font-size: 0.7rem;
    text-align: center;
    line-height: 1.5;
}
.vc-equip {
    display: block;
    font-size: 0.65rem;
    color: var(--text-muted);
    margin-top: 0.2rem;
}
.vc-arrow {
    display: flex;
    align-items: center;
    font-size: 0.9rem;
    color: var(--text-muted);
    padding: 0 0.15rem;
}

/* レスポンシブ */
@media (max-width: 768px) {
    body { padding: 1rem; }
    header h1 { font-size: 1.4rem; }
    .diagram { padding: 1rem; }
    .tree-branches { flex-direction: column; }
    .chip-cards { grid-template-columns: 1fr; }
    .structure-cards { grid-template-columns: 1fr; }
    .pkg-comparison { grid-template-columns: 1fr; }
    .binning-flow { flex-direction: column; }
    .binning-arrow { transform: rotate(90deg); }
    .vc-flow { flex-direction: column; min-width: auto; }
    .vc-arrow { justify-content: center; transform: rotate(90deg); padding: 0.3rem 0; }
}