/* =============================================================
   YuzuFi research docs — branded HTML viewer styles
   ============================================================= */

:root {
    --izu-yellow: #FED000;
    --izu-gold: #FEC200;
    --izu-yellow-tint: #fff4b3;
    --izu-yellow-soft: #fffbe6;
    --izu-ink: #1a1a1a;
    --izu-ink-soft: #4a4a4a;
    --izu-mute: #888;
    --izu-line: #ececec;
    --izu-line-soft: #f4f4f2;
    --izu-paper: #ffffff;
    --izu-shell: #faf9f6;
}

* { box-sizing: border-box; }

html, body {
    margin: 0;
    padding: 0;
    background: var(--izu-shell);
    color: var(--izu-ink);
    font-family: 'Inter', system-ui, -apple-system, 'Segoe UI', sans-serif;
    font-size: 16px;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

/* ----- Top bar ----- */
.doc-topbar {
    position: sticky;
    top: 0;
    z-index: 50;
    background: var(--izu-ink);
    color: #fff;
    padding: 14px 32px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
    border-bottom: 3px solid var(--izu-gold);
}
.doc-topbar-brand {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    color: #fff;
}
.doc-topbar-brand img {
    height: 32px;
    width: auto;
    display: block;
    background: var(--izu-yellow);
    border-radius: 4px;
    padding: 2px 6px;
}
.doc-topbar-title {
    font-size: 14px;
    font-weight: 700;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    color: var(--izu-gold);
}
.doc-topbar-nav {
    display: flex;
    gap: 18px;
    align-items: center;
    font-size: 13px;
}
.doc-topbar-nav a {
    color: #fff;
    text-decoration: none;
    padding: 6px 10px;
    border-radius: 4px;
    transition: background 0.15s;
    font-weight: 500;
}
.doc-topbar-nav a:hover {
    background: rgba(254, 194, 0, 0.18);
    color: var(--izu-gold);
}
.doc-topbar-nav a.active {
    background: var(--izu-gold);
    color: var(--izu-ink);
    font-weight: 700;
}
.doc-topbar-sep {
    font-size: 9px;
    font-weight: 800;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--izu-gold);
    opacity: 0.55;
    padding: 0 4px;
    border-left: 1px solid rgba(254, 194, 0, 0.25);
    margin-left: 6px;
}
.doc-topbar-sep:first-of-type { border-left: none; margin-left: 0; }
.doc-topbar-deck {
    margin-right: 6px;
    border-right: 1px solid rgba(254, 194, 0, 0.25);
    padding-right: 14px !important;
    color: var(--izu-gold) !important;
    font-weight: 700 !important;
}
.doc-topbar-confidential {
    font-size: 10px;
    font-weight: 700;
    letter-spacing: 0.18em;
    color: var(--izu-gold);
    border: 1px solid var(--izu-gold);
    padding: 4px 8px;
    border-radius: 3px;
}
.doc-topbar-right {
    display: flex;
    flex-direction: column;
    gap: 6px;
    align-items: flex-end;
}
.doc-topbar-right-top {
    display: flex;
    align-items: center;
    gap: 8px;
}

/* EN | 日本語 toggle in the topbar */
.doc-topbar-lang {
    display: flex;
    align-items: center;
    gap: 2px;
    font-size: 10px;
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    border: 1px solid rgba(254, 194, 0, 0.35);
    border-radius: 3px;
    overflow: hidden;
}
.doc-topbar-lang a,
.doc-topbar-lang span {
    padding: 3px 8px;
    color: rgba(255, 255, 255, 0.75);
    text-decoration: none;
    transition: color 0.15s, background 0.15s;
    font-family: 'Inter', 'Noto Sans JP', system-ui, sans-serif;
}
.doc-topbar-lang a:hover {
    color: var(--izu-gold);
    background: rgba(254, 194, 0, 0.1);
}
.doc-topbar-lang .active {
    background: var(--izu-gold);
    color: var(--izu-ink);
    font-weight: 800;
}
.doc-topbar-lang .disabled {
    color: rgba(255, 255, 255, 0.28);
    cursor: not-allowed;
}
.doc-topbar-lang .disabled:hover {
    color: rgba(255, 255, 255, 0.28);
    background: transparent;
}
.doc-topbar-section-toggle {
    font-size: 10px;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: rgba(255, 255, 255, 0.65);
    text-decoration: none;
    padding: 3px 8px;
    border-radius: 3px;
    transition: color 0.15s, background 0.15s;
}
.doc-topbar-section-toggle:hover {
    color: var(--izu-gold);
    background: rgba(254, 194, 0, 0.1);
}

/* ================================================================
   LANDING PAGE (root /index.html — customer-facing product intro)
   ================================================================ */

.landing-hero {
    padding: 80px 24px 60px;
    background: linear-gradient(135deg, var(--izu-shell) 0%, #fff 40%, var(--izu-yellow-soft) 100%);
    border-bottom: 1px solid var(--izu-line);
}
.landing-hero-inner {
    max-width: 960px;
    margin: 0 auto;
    text-align: center;
}
.landing-hero-eyebrow {
    font-family: 'JetBrains Mono', ui-monospace, monospace;
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.4em;
    text-transform: uppercase;
    color: var(--izu-gold);
    margin-bottom: 20px;
}
.landing-hero-title {
    font-size: 56px;
    font-weight: 800;
    color: var(--izu-ink);
    letter-spacing: -0.02em;
    line-height: 1.05;
    margin: 0 0 24px;
}
.landing-hero-sub {
    font-size: 20px;
    color: var(--izu-ink-soft);
    line-height: 1.55;
    max-width: 780px;
    margin: 0 auto 36px;
}
.landing-hero-cta {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}
.landing-btn {
    display: inline-flex;
    align-items: center;
    padding: 14px 28px;
    font-size: 14px;
    font-weight: 700;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    text-decoration: none;
    border-radius: 4px;
    transition: transform 0.15s, box-shadow 0.15s;
}
.landing-btn:hover {
    transform: translateY(-1px);
}
.landing-btn-primary {
    background: var(--izu-ink);
    color: var(--izu-gold);
}
.landing-btn-primary:hover {
    box-shadow: 0 6px 16px rgba(26, 26, 26, 0.2);
}
.landing-btn-secondary {
    background: transparent;
    color: var(--izu-ink);
    border: 1px solid var(--izu-ink);
}
.landing-btn-secondary:hover {
    background: var(--izu-ink);
    color: #fff;
}

/* Capital-trajectory chart embedded from the Returns Simulator */
.landing-trajectory {
    padding: 40px 24px 30px;
    background: var(--izu-shell);
}
.landing-trajectory-inner {
    max-width: 1080px;
    margin: 0 auto;
    background: #fff;
    border: 1px solid var(--izu-line);
    border-radius: 10px;
    padding: 26px 30px 22px;
}
.landing-trajectory-head {
    margin-bottom: 14px;
}
.landing-trajectory-eyebrow {
    font-family: 'JetBrains Mono', ui-monospace, monospace;
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.24em;
    text-transform: uppercase;
    color: var(--izu-mute);
    display: block;
    margin-bottom: 6px;
}
.landing-trajectory-sub {
    font-size: 14px;
    color: var(--izu-ink-soft);
    line-height: 1.55;
    margin: 0;
}
.landing-trajectory-sub strong {
    color: var(--izu-ink);
    font-weight: 700;
}
/* Result tiles above the chart (matching the simulator output panel) */
.landing-result-tiles {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 12px;
    margin: 16px 0;
}
.landing-result-tile {
    background: #fff;
    border: 1px solid var(--izu-line);
    border-left: 3px solid var(--izu-gold);
    border-radius: 5px;
    padding: 14px 16px 12px;
    min-height: 108px;
}
.landing-result-tile-primary {
    background: var(--izu-ink);
    border-color: var(--izu-ink);
    border-left-color: var(--izu-gold);
}
.landing-result-tile-primary .landing-result-tile-label {
    color: var(--izu-gold);
    opacity: 0.9;
}
.landing-result-tile-primary .landing-result-tile-value {
    color: var(--izu-gold);
}
.landing-result-tile-primary .landing-result-tile-sub {
    color: rgba(255, 255, 255, 0.6);
}
.landing-result-tile-label {
    font-family: 'JetBrains Mono', ui-monospace, monospace;
    font-size: 10px;
    font-weight: 700;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--izu-mute);
    margin-bottom: 6px;
}
.landing-result-tile-value {
    font-family: 'JetBrains Mono', ui-monospace, monospace;
    font-size: 26px;
    font-weight: 800;
    color: var(--izu-ink);
    letter-spacing: -0.01em;
    line-height: 1.1;
    margin-bottom: 4px;
}
.landing-result-tile-sub {
    font-size: 12px;
    color: var(--izu-ink-soft);
    line-height: 1.4;
}
@media (max-width: 720px) {
    .landing-result-tiles { grid-template-columns: repeat(2, 1fr); }
    .landing-result-tile-value { font-size: 22px; }
}

.landing-chart-wrap {
    width: 100%;
    margin: 8px 0 10px;
}
.landing-chart-label {
    display: block;
    font-family: 'JetBrains Mono', ui-monospace, monospace;
    font-size: 10px;
    font-weight: 700;
    letter-spacing: 0.24em;
    text-transform: uppercase;
    color: var(--izu-mute);
    margin: 4px 0 6px;
}
#landing-chart {
    display: block;
    width: 100%;
    height: 320px;
    max-height: 320px;
}
.landing-trajectory-footer {
    display: flex;
    justify-content: flex-end;
    padding-top: 8px;
}
.landing-sim-link {
    font-size: 13px;
    font-weight: 700;
    letter-spacing: 0.03em;
    color: var(--izu-ink);
    text-decoration: none;
    padding: 8px 14px;
    border: 1px solid var(--izu-gold);
    border-radius: 4px;
    background: var(--izu-yellow-soft);
    transition: background 0.15s, transform 0.15s;
}
.landing-sim-link:hover {
    background: var(--izu-gold);
    transform: translateY(-1px);
}

/* Prominent deck strip between hero and stats */
.landing-deck-strip {
    padding: 30px 24px 0;
    max-width: 1080px;
    margin: 20px auto 0;
    position: relative;
    z-index: 1;
}
.landing-deck-card {
    display: block;
    padding: 30px 36px;
    background: var(--izu-ink);
    color: #fff;
    border-radius: 10px;
    border: 2px solid var(--izu-gold);
    text-decoration: none;
    box-shadow: 0 10px 32px rgba(26, 26, 26, 0.18);
    transition: transform 0.2s, box-shadow 0.2s;
    position: relative;
    overflow: hidden;
}
.landing-deck-card::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    width: 260px;
    background: radial-gradient(circle at 75% 50%, rgba(254, 194, 0, 0.14), transparent 60%);
    pointer-events: none;
}
.landing-deck-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 14px 40px rgba(26, 26, 26, 0.25);
}
.landing-deck-badge {
    display: inline-block;
    font-family: 'JetBrains Mono', ui-monospace, monospace;
    font-size: 10px;
    font-weight: 700;
    letter-spacing: 0.22em;
    text-transform: uppercase;
    color: var(--izu-gold);
    padding: 4px 10px;
    border: 1px solid var(--izu-gold);
    border-radius: 3px;
    margin-bottom: 14px;
}
.landing-deck-title {
    font-size: 32px;
    font-weight: 800;
    color: #fff;
    letter-spacing: -0.01em;
    margin: 0 0 10px;
}
.landing-deck-desc {
    font-size: 15px;
    color: rgba(255, 255, 255, 0.75);
    line-height: 1.55;
    margin: 0 0 22px;
    max-width: 720px;
}
.landing-deck-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 20px;
    flex-wrap: wrap;
}
.landing-deck-meta {
    font-family: 'JetBrains Mono', ui-monospace, monospace;
    font-size: 12px;
    font-weight: 600;
    color: rgba(255, 255, 255, 0.55);
    letter-spacing: 0.04em;
}
.landing-deck-cta {
    font-size: 14px;
    font-weight: 800;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--izu-ink);
    background: var(--izu-gold);
    padding: 10px 22px;
    border-radius: 4px;
    transition: background 0.15s;
}
.landing-deck-card:hover .landing-deck-cta {
    background: var(--izu-yellow);
}

.landing-stats {
    padding: 50px 24px 40px;
    background: #fff;
    border-bottom: 1px solid var(--izu-line);
}
.landing-stats-grid {
    max-width: 1080px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}
.landing-stat {
    text-align: center;
    padding: 20px 12px;
    border-right: 1px solid var(--izu-line);
}
.landing-stat:last-child { border-right: none; }
.landing-stat-highlight {
    background: linear-gradient(180deg, rgba(22, 163, 74, 0.06) 0%, rgba(22, 163, 74, 0) 100%);
    border-radius: 6px;
}
.landing-stat-highlight .landing-stat-value {
    color: #15803d;  /* dark green — high contrast on white */
    font-weight: 800;
}
.landing-stat-highlight .landing-stat-label {
    color: #15803d;
}
.landing-stat-value {
    font-family: 'JetBrains Mono', ui-monospace, monospace;
    font-size: 42px;
    font-weight: 700;
    color: var(--izu-ink);
    letter-spacing: -0.02em;
    line-height: 1;
    margin-bottom: 10px;
}
.landing-stat-label {
    font-size: 13px;
    font-weight: 600;
    color: var(--izu-ink);
    line-height: 1.4;
}
.landing-stat-sub {
    font-size: 11px;
    font-weight: 500;
    color: var(--izu-mute);
    text-transform: uppercase;
    letter-spacing: 0.08em;
}
@media (max-width: 720px) {
    .landing-stats-grid { grid-template-columns: repeat(2, 1fr); }
    .landing-stat:nth-child(2) { border-right: none; }
}

.landing-pillars,
.landing-moat,
.landing-materials {
    padding: 70px 24px;
    max-width: 1200px;
    margin: 0 auto;
}
.landing-moat {
    background: #fff;
    border: 1px solid var(--izu-line);
    border-radius: 12px;
    max-width: 1140px;
    padding: 60px 40px;
}
.landing-section-head {
    max-width: 780px;
    margin: 0 auto 48px;
    text-align: center;
}
.landing-section-eyebrow {
    font-family: 'JetBrains Mono', ui-monospace, monospace;
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.3em;
    text-transform: uppercase;
    color: var(--izu-gold);
    display: block;
    margin-bottom: 14px;
}
.landing-section-title {
    font-size: 32px;
    font-weight: 800;
    color: var(--izu-ink);
    letter-spacing: -0.01em;
    line-height: 1.2;
    margin: 0 0 12px;
}
.landing-section-sub {
    font-size: 15px;
    color: var(--izu-ink-soft);
    line-height: 1.55;
    margin: 0;
}

.landing-pillars-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}
.landing-pillar {
    padding: 28px 26px;
    background: #fff;
    border: 1px solid var(--izu-line);
    border-top: 3px solid var(--izu-gold);
    border-radius: 6px;
}
.landing-pillar-num {
    font-family: 'JetBrains Mono', ui-monospace, monospace;
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.14em;
    color: var(--izu-gold);
    margin-bottom: 12px;
}
.landing-pillar-title {
    font-size: 20px;
    font-weight: 700;
    color: var(--izu-ink);
    margin: 0 0 12px;
    line-height: 1.3;
}
.landing-pillar-body {
    font-size: 14px;
    color: var(--izu-ink-soft);
    line-height: 1.6;
    margin: 0;
}
@media (max-width: 900px) {
    .landing-pillars-grid { grid-template-columns: 1fr; }
}

.landing-moat-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 32px;
    margin-bottom: 32px;
}
.landing-moat-side {
    padding: 20px 24px;
    background: var(--izu-shell);
    border-left: 4px solid var(--izu-gold);
    border-radius: 4px;
}
.landing-moat-label {
    font-family: 'JetBrains Mono', ui-monospace, monospace;
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--izu-gold);
    margin-bottom: 10px;
}
.landing-moat-body {
    font-size: 14px;
    color: var(--izu-ink-soft);
    line-height: 1.6;
    margin: 0;
}
.landing-moat-close {
    text-align: center;
    font-size: 18px;
    font-weight: 600;
    color: var(--izu-ink);
    line-height: 1.5;
    font-style: italic;
    padding: 20px 20px 0;
    border-top: 1px solid var(--izu-line);
    margin: 32px 0 0;
}
@media (max-width: 720px) {
    .landing-moat-grid { grid-template-columns: 1fr; }
    .landing-moat { padding: 40px 24px; }
}

/* ----- Article ----- */
.doc-article {
    max-width: 920px;
    margin: 40px auto 80px;
    background: var(--izu-paper);
    border-radius: 6px;
    box-shadow: 0 4px 20px rgba(20, 18, 12, 0.06);
    padding: 56px 64px;
    border: 1px solid var(--izu-line);
}

/* ----- Typography ----- */
.doc-article h1 {
    font-size: 36px;
    font-weight: 800;
    line-height: 1.15;
    margin: 0 0 14px;
    color: var(--izu-ink);
    letter-spacing: -0.01em;
}
.doc-article h1:first-of-type {
    border-bottom: 4px solid var(--izu-gold);
    padding-bottom: 18px;
    margin-bottom: 28px;
}
.doc-article h2 {
    font-size: 24px;
    font-weight: 800;
    line-height: 1.2;
    margin: 44px 0 14px;
    color: var(--izu-ink);
    padding-top: 14px;
    border-top: 1px solid var(--izu-line);
}
.doc-article h2:first-of-type { border-top: none; padding-top: 0; }
.doc-article h3 {
    font-size: 18px;
    font-weight: 700;
    line-height: 1.25;
    margin: 28px 0 10px;
    color: var(--izu-ink);
}
.doc-article h4 {
    font-size: 15px;
    font-weight: 700;
    margin: 22px 0 8px;
    color: var(--izu-ink-soft);
    text-transform: uppercase;
    letter-spacing: 0.06em;
}

.doc-article p {
    margin: 0 0 14px;
    color: var(--izu-ink-soft);
}
.doc-article p strong { color: var(--izu-ink); font-weight: 700; }
.doc-article em { font-style: italic; color: var(--izu-ink); }

.doc-article a {
    color: var(--izu-ink);
    text-decoration: underline;
    text-decoration-color: var(--izu-gold);
    text-decoration-thickness: 2px;
    text-underline-offset: 2px;
    transition: color 0.15s;
}
.doc-article a:hover {
    color: var(--izu-gold);
}

/* ----- Lists ----- */
.doc-article ul, .doc-article ol {
    margin: 0 0 16px;
    padding-left: 26px;
    color: var(--izu-ink-soft);
}
.doc-article li { margin-bottom: 6px; }
.doc-article li > strong { color: var(--izu-ink); }
.doc-article ul li::marker { color: var(--izu-gold); }
.doc-article ol li::marker { color: var(--izu-gold); font-weight: 700; }

.doc-article input[type="checkbox"] {
    accent-color: var(--izu-gold);
    margin-right: 6px;
}

/* ----- Blockquote (used for TL;DR / callouts) ----- */
.doc-article blockquote {
    margin: 22px 0;
    padding: 16px 22px;
    background: var(--izu-yellow-soft);
    border-left: 4px solid var(--izu-gold);
    color: var(--izu-ink);
    border-radius: 0 4px 4px 0;
}
.doc-article blockquote p { color: var(--izu-ink); margin: 0 0 8px; }
.doc-article blockquote p:last-child { margin-bottom: 0; }
.doc-article blockquote strong { color: var(--izu-ink); }

/* ----- Code ----- */
.doc-article code {
    font-family: 'JetBrains Mono', 'Fira Code', Consolas, monospace;
    background: var(--izu-line-soft);
    border: 1px solid var(--izu-line);
    border-radius: 3px;
    padding: 2px 6px;
    font-size: 13px;
    color: var(--izu-ink);
}
.doc-article pre {
    background: var(--izu-ink);
    color: var(--izu-yellow);
    padding: 18px 22px;
    border-radius: 4px;
    overflow-x: auto;
    margin: 18px 0;
    border-left: 4px solid var(--izu-gold);
    font-size: 13px;
    line-height: 1.55;
}
.doc-article pre code {
    background: transparent;
    border: none;
    padding: 0;
    color: inherit;
    font-size: inherit;
}

/* ----- Tables ----- */
.doc-article table {
    border-collapse: collapse;
    width: 100%;
    margin: 22px 0;
    font-size: 14px;
    background: #fff;
}
.doc-article thead {
    background: var(--izu-ink);
    color: var(--izu-gold);
}
.doc-article th {
    text-align: left;
    padding: 12px 14px;
    font-weight: 700;
    font-size: 11px;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    border: 1px solid var(--izu-ink);
}
.doc-article td {
    padding: 10px 14px;
    border: 1px solid var(--izu-line);
    vertical-align: top;
    color: var(--izu-ink-soft);
}
.doc-article tr:nth-child(even) td {
    background: var(--izu-line-soft);
}
.doc-article td strong { color: var(--izu-ink); }

/* ----- Horizontal rule ----- */
.doc-article hr {
    border: none;
    border-top: 2px solid var(--izu-line);
    margin: 36px 0;
    position: relative;
}
.doc-article hr::after {
    content: '';
    position: absolute;
    top: -2px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 2px;
    background: var(--izu-gold);
}

/* ----- Footer ----- */
.doc-footer {
    text-align: center;
    padding: 32px 16px 48px;
    color: var(--izu-mute);
    font-size: 12px;
    letter-spacing: 0.04em;
}
.doc-footer a {
    color: var(--izu-gold);
    text-decoration: none;
    font-weight: 600;
}

/* ----- Index hub specific ----- */
.hub-hero {
    max-width: 1100px;
    margin: 48px auto 16px;
    padding: 0 32px;
}
.hub-hero-eyebrow {
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.18em;
    color: var(--izu-mute);
    text-transform: uppercase;
    margin-bottom: 12px;
}
.hub-hero-title {
    font-size: 44px;
    font-weight: 800;
    line-height: 1.1;
    margin: 0 0 16px;
    color: var(--izu-ink);
    letter-spacing: -0.01em;
}
.hub-hero-sub {
    font-size: 17px;
    color: var(--izu-ink-soft);
    max-width: 720px;
    line-height: 1.55;
    margin: 0;
}

.hub-grid {
    max-width: 1100px;
    margin: 36px auto 80px;
    padding: 0 32px;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 22px;
}
.hub-grid-flush { margin: 0 auto; }

/* Deck card — visually distinguish the gated presentation */
.hub-card-deck {
    background: var(--izu-ink) !important;
    color: #fff !important;
    border-left-color: var(--izu-gold) !important;
    border-left-width: 6px !important;
}
.hub-card-deck .hub-card-num {
    color: var(--izu-gold);
    background: rgba(254, 194, 0, 0.12);
    padding: 2px 8px;
    border-radius: 3px;
    align-self: flex-start;
}
.hub-card-deck .hub-card-title { color: var(--izu-yellow); }
.hub-card-deck .hub-card-desc { color: #d9d6cc; }
.hub-card-deck .hub-card-meta {
    color: var(--izu-gold);
    border-top-color: rgba(254, 194, 0, 0.2);
}
.hub-card-deck:hover {
    background: #2a2a2a !important;
    border-left-color: var(--izu-yellow) !important;
}

.hub-section {
    max-width: 1100px;
    margin: 28px auto 0;
    padding: 0 32px;
}
.hub-section + .hub-section { margin-top: 48px; }

.hub-section-head {
    margin-bottom: 18px;
    padding-bottom: 14px;
    border-bottom: 2px solid var(--izu-gold);
}
.hub-section-internal .hub-section-head {
    border-bottom-color: var(--izu-mute);
}
.hub-section-eyebrow {
    display: inline-block;
    font-size: 10px;
    font-weight: 800;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--izu-ink);
    background: var(--izu-yellow);
    padding: 4px 10px;
    border-radius: 3px;
    margin-bottom: 8px;
}
.hub-section-internal .hub-section-eyebrow {
    background: var(--izu-ink);
    color: var(--izu-yellow);
}
.hub-section-title {
    font-size: 22px;
    font-weight: 800;
    color: var(--izu-ink);
    margin: 6px 0 4px;
    line-height: 1.2;
}
.hub-section-sub {
    font-size: 13px;
    color: var(--izu-ink-soft);
    margin: 0;
    max-width: 760px;
    line-height: 1.5;
}
.hub-card {
    background: var(--izu-paper);
    border: 1px solid var(--izu-line);
    border-left: 5px solid var(--izu-gold);
    border-radius: 6px;
    padding: 28px 28px 24px;
    text-decoration: none;
    color: inherit;
    transition: transform 0.18s, box-shadow 0.18s, border-color 0.18s;
    display: flex;
    flex-direction: column;
    gap: 8px;
}
.hub-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 28px rgba(20, 18, 12, 0.09);
    border-left-color: var(--izu-ink);
}
.hub-card-num {
    font-family: 'JetBrains Mono', Consolas, monospace;
    font-size: 12px;
    color: var(--izu-gold);
    font-weight: 700;
    letter-spacing: 0.12em;
}
.hub-card-title {
    font-size: 22px;
    font-weight: 800;
    line-height: 1.2;
    color: var(--izu-ink);
    margin: 0;
}
.hub-card-desc {
    font-size: 14px;
    color: var(--izu-ink-soft);
    line-height: 1.5;
    margin: 6px 0 12px;
}
.hub-card-meta {
    font-size: 11px;
    color: var(--izu-mute);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    font-weight: 600;
    border-top: 1px solid var(--izu-line);
    padding-top: 10px;
    margin-top: auto;
}

.hub-card-docx {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 12px;
    font-weight: 600;
    color: var(--izu-ink);
    background: var(--izu-yellow-tint);
    border: 1px solid var(--izu-gold);
    padding: 8px 12px;
    border-radius: 3px;
    margin-top: 10px;
    cursor: pointer;
    transition: background 0.15s;
}
.hub-card-docx:hover {
    background: var(--izu-gold);
}
.hub-card-docx .docx-icon {
    background: #2B579A;
    color: #fff;
    font-size: 10px;
    font-weight: 800;
    letter-spacing: 0.05em;
    padding: 3px 6px;
    border-radius: 2px;
    font-family: 'JetBrains Mono', Consolas, monospace;
}

/* JA-version chip on hub cards */
.hub-card-ja {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 12px;
    font-weight: 600;
    color: var(--izu-ink);
    background: #fff;
    border: 1px solid var(--izu-line);
    padding: 8px 12px;
    border-radius: 3px;
    margin-top: 8px;
    cursor: pointer;
    transition: background 0.15s, border-color 0.15s;
}
.hub-card-ja:hover {
    background: var(--izu-yellow-soft);
    border-color: var(--izu-gold);
}
.hub-card-ja .ja-icon {
    background: #dc2626;
    color: #fff;
    font-size: 10px;
    font-weight: 800;
    letter-spacing: 0.05em;
    padding: 3px 6px;
    border-radius: 2px;
    font-family: 'JetBrains Mono', Consolas, monospace;
}

/* Language toggle strip above article body */
.lang-toggle {
    max-width: 780px;
    margin: 18px auto 0;
    padding: 0 32px;
    display: flex;
    gap: 4px;
    justify-content: flex-end;
}
.lang-toggle a {
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    padding: 4px 12px;
    border-radius: 3px;
    color: var(--izu-mute);
    text-decoration: none;
    border: 1px solid var(--izu-line);
    transition: background 0.15s, color 0.15s, border-color 0.15s;
}
.lang-toggle a:hover {
    background: var(--izu-yellow-soft);
    color: var(--izu-ink);
}
.lang-toggle a.active {
    background: var(--izu-ink);
    color: var(--izu-gold);
    border-color: var(--izu-ink);
}

/* Japanese-language body: swap to Noto Sans JP so mixed EN/JA reads uniformly */
body.lang-ja,
body.lang-ja .doc-article {
    font-family: 'Noto Sans JP', 'Inter', system-ui, sans-serif;
}
body.lang-ja .doc-article h1,
body.lang-ja .doc-article h2,
body.lang-ja .doc-article h3,
body.lang-ja .doc-article h4 {
    font-family: 'Noto Sans JP', 'Inter', sans-serif;
    font-weight: 700;
}
body.lang-ja .doc-article code,
body.lang-ja .doc-article pre {
    font-family: 'JetBrains Mono', Consolas, monospace;
}

.hub-disclaimer {
    max-width: 1100px;
    margin: 0 auto 48px;
    padding: 18px 32px;
    color: var(--izu-mute);
    font-size: 12px;
    font-style: italic;
    text-align: center;
}

/* ----- Responsive ----- */
@media (max-width: 768px) {
    .doc-article { padding: 28px 22px; margin: 16px; border-radius: 0; }
    .doc-article h1 { font-size: 26px; }
    .doc-article h2 { font-size: 20px; }
    .doc-topbar { padding: 10px 16px; gap: 12px; flex-wrap: wrap; }
    .doc-topbar-confidential { display: none; }
    .hub-hero-title { font-size: 30px; }
    .hub-hero, .hub-grid, .hub-disclaimer { padding: 0 18px; }
}