.nav {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    padding: var(--spacing-md) 0;
    margin-bottom: var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
}
.nav-back {
    color: var(--accent-primary-strong);
    text-decoration: none;
    font-weight: 600;
    transition: all 0.25s ease;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-pill);
    background: var(--accent-primary-soft);
    font-size: 0.92rem;
    white-space: nowrap;
}
.nav-back:hover { background: var(--accent-primary-tint); transform: translateX(-2px); }
.nav-title { font-size: 1.3rem; font-weight: 700; color: var(--text-primary); }

.content { max-width: 820px; margin: 0 auto; }

.page-hero {
    position: relative;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: var(--spacing-2xl) var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
    overflow: hidden;
}
.page-hero::after {
    content: '';
    position: absolute;
    right: -60px; top: -60px;
    width: 220px; height: 220px;
    background: radial-gradient(circle, rgba(232,132,60,0.18), transparent 70%);
    pointer-events: none;
}
.page-hero .hero-eyebrow {
    display: inline-block;
    font-size: 0.82rem; font-weight: 700; letter-spacing: 0.12em;
    color: var(--accent-primary-strong);
    text-transform: uppercase;
    margin-bottom: var(--spacing-sm);
}
.page-hero h1 { font-size: 2rem; font-weight: 800; line-height: 1.25; color: var(--text-primary); margin-bottom: var(--spacing-sm); }
.page-hero p { font-size: 1.18rem; color: var(--text-secondary); line-height: 1.75; max-width: 60ch; }
.page-hero .hero-meta { margin-top: var(--spacing-md); display: flex; flex-wrap: wrap; gap: var(--spacing-sm); }

.intro { text-align: center; padding: var(--spacing-xl) 0; margin-bottom: var(--spacing-lg); }
.intro-icon { font-size: 2.6rem; margin-bottom: var(--spacing-md); }
.intro h2 { font-size: 1.6rem; margin-bottom: var(--spacing-md); color: var(--text-primary); font-weight: 800; }
.lead { font-size: 1.18rem; color: var(--text-secondary); line-height: 1.75; max-width: 60ch; margin: 0 auto; }

.section {
    margin-bottom: var(--spacing-xl);
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-sm);
}
.section-title {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    font-size: 1.5rem;
    margin-bottom: var(--spacing-lg);
    color: var(--text-primary);
    font-weight: 700;
    line-height: 1.35;
}
.section-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px; height: 40px;
    flex-shrink: 0;
    background: var(--accent-primary);
    color: var(--text-on-accent);
    border-radius: var(--radius-md);
    font-size: 1.05rem;
    font-weight: 800;
    box-shadow: var(--shadow-sm);
}

.markdown-content p, .section > p, .step-content p { font-size: 1rem; line-height: 1.85; color: var(--text-secondary); margin-bottom: var(--spacing-md); }
.markdown-content strong, .section strong { color: var(--text-primary); font-weight: 700; }
.hl { background: linear-gradient(transparent 60%, var(--accent-warning-soft) 60%); padding: 0 2px; font-weight: 600; color: var(--text-primary); }

.content ul:not(.substeps):not(.flow):not(.card-tags) { list-style: none; padding-left: 0; }
.content ul:not(.substeps):not(.flow):not(.card-tags) li {
    position: relative; padding-left: var(--spacing-lg);
    margin-bottom: var(--spacing-sm); color: var(--text-secondary);
    line-height: 1.85; font-size: 1rem;
}
.content ul:not(.substeps):not(.flow):not(.card-tags) li::before {
    content: '•'; position: absolute; left: var(--spacing-xs);
    color: var(--accent-primary); font-weight: bold; font-size: 1.1em;
}
.content ol { padding-left: 1.4em; }
.content ol li { font-size: 1rem; line-height: 1.85; color: var(--text-secondary); margin-bottom: var(--spacing-sm); }

.flow { display: flex; flex-wrap: wrap; align-items: stretch; gap: var(--spacing-sm); list-style: none; padding: 0; margin: var(--spacing-lg) 0; }
.flow-step {
    flex: 1 1 0; min-width: 150px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    position: relative;
    text-align: center;
}
.flow-step .flow-num { display:inline-flex; align-items:center; justify-content:center; width:30px; height:30px; border-radius:50%; background:var(--accent-primary-soft); color:var(--accent-primary-strong); font-weight:800; margin-bottom: var(--spacing-xs); }
.flow-step h5 { font-size: 1rem; color: var(--text-primary); font-weight: 700; margin-bottom: 2px; }
.flow-step p { font-size: 0.88rem; color: var(--text-muted); line-height: 1.5; margin: 0; }
.flow-step.is-active { border-color: var(--accent-primary); box-shadow: var(--shadow-glow); }
.flow-step.is-done { background: var(--accent-success-soft); border-color: var(--accent-success); }
.flow-step.is-done .flow-num { background: var(--accent-success); color: #fff; }

.steps { display: flex; flex-direction: column; gap: var(--spacing-lg); }
.step, .step-card {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    transition: all 0.25s ease;
}
.step:hover, .step-card:hover { border-color: var(--border-strong); box-shadow: var(--shadow-sm); }
.step-header { display: flex; align-items: center; gap: var(--spacing-md); margin-bottom: var(--spacing-sm); }
.step-number {
    display: flex; align-items: center; justify-content: center;
    width: 38px; height: 38px; flex-shrink: 0;
    background: var(--accent-primary); color: var(--text-on-accent);
    border-radius: 50%; font-size: 1.05rem; font-weight: 800;
    box-shadow: var(--shadow-sm);
}
.step-header h4 { font-size: 1.12rem; color: var(--text-primary); font-weight: 700; }
.step-content { padding-left: calc(38px + var(--spacing-md)); }
.step-content p { color: var(--text-secondary); line-height: 1.85; margin-bottom: var(--spacing-md); font-size: 1rem; }
.substeps { padding-left: var(--spacing-lg); color: var(--text-secondary); font-size: 0.96rem; }
.substeps li { margin-bottom: var(--spacing-sm); line-height: 1.7; }
@media (max-width: 768px) { .step-content { padding-left: 0; } }

.figure { margin: var(--spacing-lg) 0; }
.figure img { width: 100%; height: auto; display: block; border-radius: var(--radius-md); border: 1px solid var(--border-color); box-shadow: var(--shadow-md); background: var(--bg-secondary); }
.figure figcaption, .fig-caption { margin-top: var(--spacing-sm); font-size: 0.9rem; color: var(--text-muted); text-align: center; line-height: 1.6; }

.screenshot {
    margin: var(--spacing-lg) 0;
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--border-strong);
    box-shadow: var(--shadow-lg);
    background: var(--bg-secondary);
}
.screenshot .shot-bar {
    display: flex; align-items: center; gap: 6px;
    padding: 8px 12px; background: var(--bg-sunken);
    border-bottom: 1px solid var(--border-color);
}
.screenshot .shot-bar i { width: 11px; height: 11px; border-radius: 50%; display: inline-block; }
.screenshot .shot-bar .d1 { background: #E0726A; } .screenshot .shot-bar .d2 { background: #E6B45A; } .screenshot .shot-bar .d3 { background: #7FB97F; }
.screenshot .shot-bar .shot-title { margin-left: 8px; font-size: 0.82rem; color: var(--text-muted); }
.screenshot img { width: 100%; height: auto; display: block; }
.screenshot .shot-caption { padding: var(--spacing-sm) var(--spacing-md); font-size: 0.9rem; color: var(--text-muted); background: var(--bg-secondary); border-top: 1px solid var(--border-color); }

.diagram { margin: var(--spacing-lg) 0; padding: var(--spacing-lg); background: var(--bg-secondary); border: 1px solid var(--border-color); border-radius: var(--radius-lg); box-shadow: var(--shadow-sm); }
.diagram svg { width: 100%; height: auto; display: block; }
.diagram .fig-caption { margin-top: var(--spacing-md); }

.note {
    position: relative;
    padding: var(--spacing-md) var(--spacing-md) var(--spacing-md) 52px;
    border-radius: var(--radius-md);
    margin: var(--spacing-md) 0;
    border-left: 4px solid;
    font-size: 1rem;
    line-height: 1.8;
    color: var(--text-secondary);
}
.note strong { display: block; margin-bottom: 2px; font-weight: 700; color: var(--text-primary); }
.note::before { position: absolute; left: 16px; top: 14px; font-size: 1.25rem; line-height: 1; }
.note-info    { background: var(--accent-info-soft);    border-color: var(--accent-info); }
.note-info::before { content: 'ℹ️'; }
.note-success { background: var(--accent-success-soft); border-color: var(--accent-success); }
.note-success::before { content: '✅'; }
.note-warning { background: var(--accent-warning-soft); border-color: var(--accent-warning); }
.note-warning::before { content: '⚠️'; }
.note-danger  { background: var(--accent-danger-soft);  border-color: var(--accent-danger); }
.note-danger::before { content: '⛔'; }
.note-tip     { background: var(--accent-tip-soft);     border-color: var(--accent-tip); }
.note-tip::before { content: '💡'; }

.faq { display: flex; flex-direction: column; gap: var(--spacing-sm); }
.faq-item { border: 1px solid var(--border-color); border-radius: var(--radius-md); background: var(--bg-secondary); overflow: hidden; }
.faq-item summary {
    cursor: pointer; list-style: none;
    padding: var(--spacing-md) var(--spacing-lg);
    font-weight: 700; color: var(--text-primary); font-size: 1.05rem;
    display: flex; align-items: center; gap: var(--spacing-sm);
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::before { content: '❓'; font-size: 1rem; }
.faq-item summary::after { content: '▸'; margin-left: auto; color: var(--accent-primary); transition: transform 0.2s ease; }
.faq-item[open] summary::after { transform: rotate(90deg); }
.faq-item[open] summary { background: var(--accent-primary-soft); }
.faq-answer { padding: var(--spacing-md) var(--spacing-lg) var(--spacing-lg); color: var(--text-secondary); line-height: 1.85; font-size: 1rem; }
.faq-answer p { margin-bottom: var(--spacing-sm); }

.chip {
    display: inline-flex; align-items: center; gap: 4px;
    padding: 4px 12px; border-radius: var(--radius-pill);
    font-size: 0.82rem; font-weight: 600; line-height: 1.4;
    background: var(--bg-tertiary); color: var(--text-secondary);
    border: 1px solid var(--border-color);
}
.chip-primary { background: var(--accent-primary-soft); color: var(--accent-primary-strong); border-color: transparent; }
.chip-success { background: var(--accent-success-soft); color: var(--accent-success-strong); border-color: transparent; }
.chip-warning { background: var(--accent-warning-soft); color: #9A6A18; border-color: transparent; }
.chip-info    { background: var(--accent-info-soft);    color: #2E6A93; border-color: transparent; }

.card-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: var(--spacing-md); margin: var(--spacing-lg) 0; }
.guide-card {
    display: block; text-decoration: none;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    transition: all 0.25s ease;
    box-shadow: var(--shadow-sm);
}
.guide-card:hover { transform: translateY(-3px); border-color: var(--accent-primary); box-shadow: var(--shadow-md); }
.guide-card .gc-icon { font-size: 2rem; margin-bottom: var(--spacing-sm); }
.guide-card h4 { font-size: 1.12rem; color: var(--text-primary); font-weight: 700; margin-bottom: var(--spacing-xs); }
.guide-card p { font-size: 0.95rem; color: var(--text-muted); line-height: 1.6; }

.requirements-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: var(--spacing-md); }
.requirement-card { background: var(--bg-tertiary); border: 1px solid var(--border-color); border-radius: var(--radius-md); padding: var(--spacing-lg); text-align: center; transition: all 0.25s ease; }
.requirement-card:hover { transform: translateY(-2px); border-color: var(--accent-primary); box-shadow: var(--shadow-sm); }
.req-icon { font-size: 1.8rem; margin-bottom: var(--spacing-sm); }
.requirement-card h4 { font-size: 1rem; margin-bottom: var(--spacing-xs); color: var(--text-primary); font-weight: 700; }
.requirement-card p { font-size: 0.9rem; color: var(--text-secondary); line-height: 1.6; }

.feature-list { display: grid; gap: var(--spacing-md); }
.feature-item { display: flex; gap: var(--spacing-md); padding: var(--spacing-lg); background: var(--bg-tertiary); border: 1px solid var(--border-color); border-radius: var(--radius-md); transition: all 0.25s ease; }
.feature-item:hover { border-color: var(--accent-primary); transform: translateX(2px); }
.feature-item-icon { font-size: 1.5rem; flex-shrink: 0; }
.feature-item-content h4 { font-size: 1.06rem; margin-bottom: var(--spacing-xs); color: var(--text-primary); font-weight: 700; }
.feature-item-content p { color: var(--text-secondary); line-height: 1.7; font-size: 0.95rem; }

.content table, .markdown-content table { width: 100%; border-collapse: collapse; margin: var(--spacing-md) 0; font-size: 0.96rem; background: var(--bg-secondary); border-radius: var(--radius-md); overflow: hidden; }
.content th, .content td, .markdown-content th, .markdown-content td { padding: var(--spacing-sm) var(--spacing-md); text-align: left; border-bottom: 1px solid var(--border-color); line-height: 1.6; }
.content th, .markdown-content th { background: var(--accent-primary-soft); color: var(--text-primary); font-weight: 700; }
.content tr:last-child td { border-bottom: none; }

code { background: var(--bg-sunken); padding: 0.15em 0.45em; border-radius: var(--radius-sm); font-family: var(--font-mono); color: var(--accent-primary-strong); font-size: 0.92em; }
.code-block { background: var(--bg-sunken); border: 1px solid var(--border-color); border-radius: var(--radius-md); padding: var(--spacing-md); margin: var(--spacing-md) 0; overflow-x: auto; }
.code-block code { background: none; padding: 0; color: var(--text-primary); }

.next-steps { text-align: center; padding: var(--spacing-xl); background: linear-gradient(135deg, var(--accent-primary-soft), var(--bg-tertiary)); border: 1px solid var(--border-color); border-radius: var(--radius-lg); margin-top: var(--spacing-xl); }
.next-steps h3 { font-size: 1.3rem; margin-bottom: var(--spacing-sm); color: var(--text-primary); font-weight: 700; }
.next-steps p { color: var(--text-secondary); margin-bottom: var(--spacing-lg); font-size: 1rem; }

.btn { display: inline-block; padding: var(--spacing-sm) var(--spacing-xl); background: var(--accent-primary); color: var(--text-on-accent); text-decoration: none; border-radius: var(--radius-pill); font-weight: 700; font-size: 1rem; transition: all 0.25s ease; box-shadow: var(--shadow-sm); border: none; }
.btn:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); background: var(--accent-primary-strong); }
.btn-ghost { background: transparent; color: var(--accent-primary-strong); border: 2px solid var(--accent-primary); box-shadow: none; }
.btn-ghost:hover { background: var(--accent-primary-soft); }

.page-nav { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: var(--spacing-md); margin-top: var(--spacing-xl); padding: var(--spacing-xl) 0; border-top: 1px solid var(--border-color); }
.page-nav-link { display: flex; flex-direction: column; gap: var(--spacing-xs); padding: var(--spacing-lg); background: var(--bg-secondary); border: 1px solid var(--border-color); border-radius: var(--radius-lg); text-decoration: none; transition: all 0.25s ease; }
.page-nav-link:hover { transform: translateY(-2px); border-color: var(--accent-primary); box-shadow: var(--shadow-sm); }
.page-nav-next { text-align: right; }
.page-nav-label { font-size: 0.8rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.05em; }
.page-nav-title { font-size: 1rem; font-weight: 700; color: var(--text-primary); }

.step-content img, .section img:not(.figure img):not(.screenshot img), .intro img, .markdown-content img { max-width: 100%; height: auto; border-radius: var(--radius-md); margin: var(--spacing-md) 0; border: 1px solid var(--border-color); box-shadow: var(--shadow-sm); display: block; }
.intro img { margin: var(--spacing-lg) auto; }

@media (max-width: 768px) {
    .nav { flex-direction: column; align-items: flex-start; gap: var(--spacing-sm); }
    .nav-title { font-size: 1.1rem; }
    .page-hero { padding: var(--spacing-xl) var(--spacing-lg); }
    .page-hero h1 { font-size: 1.6rem; }
    .intro h2 { font-size: 1.3rem; }
    .section { padding: var(--spacing-lg); }
    .section-title { font-size: 1.25rem; }
    .content { max-width: 100%; }
    .requirements-grid, .card-grid { grid-template-columns: 1fr; }
}

.content {
    width: 100%;
    max-width: 880px;
}

.nav {
    position: sticky;
    z-index: 20;
    top: 4px;
    margin: -0.4rem 0 var(--spacing-lg);
    padding: 0.85rem 0;
    background: color-mix(in srgb, var(--bg-primary) 94%, transparent);
    backdrop-filter: blur(10px);
}

.nav-back:hover,
.nav-back:focus-visible {
    background: var(--accent-primary-tint);
    color: var(--accent-primary-strong);
}

.page-hero {
    background: linear-gradient(135deg, #fff8f1 0%, var(--accent-primary-soft) 100%);
    border-color: var(--border-strong);
}

.page-hero h1,
.section-title,
.markdown-content h1,
.markdown-content h2,
.markdown-content h3,
.markdown-content h4 {
    letter-spacing: -0.025em;
}

.section {
    box-shadow: none;
}

.step-card {
    display: grid;
    grid-template-columns: auto minmax(0, 1fr);
    gap: var(--spacing-md);
}

.step-card > .step-number {
    margin-top: 0.15rem;
}

.step-card > .step-content {
    padding-left: 0;
}

.step-card .step-content h4 {
    margin: 0 0 var(--spacing-sm);
    font-size: 1.12rem;
}

.flow-arrow {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: var(--accent-primary-strong);
    font-weight: 900;
}

.checklist {
    display: grid;
    gap: 0.65rem;
    margin: var(--spacing-md) 0;
}

.check-item {
    display: grid;
    grid-template-columns: auto minmax(0, 1fr);
    gap: 0.75rem;
    align-items: start;
    padding: 0.9rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background: var(--bg-secondary);
    color: var(--text-secondary);
    cursor: pointer;
    line-height: 1.65;
}

.check-item:hover {
    border-color: var(--border-strong);
}

.check-item input {
    width: 1.1rem;
    height: 1.1rem;
    margin-top: 0.25rem;
    accent-color: var(--accent-success);
}

.next-links {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.7rem;
    margin-top: var(--spacing-md);
}

.next-link {
    display: inline-flex;
    min-height: 2.75rem;
    align-items: center;
    padding: 0.55rem 0.9rem;
    border: 1px solid var(--accent-primary);
    border-radius: var(--radius-sm);
    background: var(--bg-secondary);
    color: var(--accent-primary-strong);
    font-weight: 800;
    text-decoration: none;
}

.next-link:hover {
    background: var(--accent-primary-soft);
}

.reading-list {
    display: grid;
    gap: var(--spacing-sm);
    margin: var(--spacing-md) 0;
}

.content pre,
.markdown-content pre {
    max-width: 100%;
    overflow-x: auto;
    padding: var(--spacing-md);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background: #262c29;
    color: #f7f3ed;
    font-family: var(--font-mono);
    font-size: 0.88rem;
    line-height: 1.65;
}

.content pre code,
.markdown-content pre code {
    padding: 0;
    background: transparent;
    color: inherit;
}

.content table,
.markdown-content table {
    min-width: 38rem;
}

.faq-item summary:focus-visible {
    outline: 2px solid var(--focus-ring);
    outline-offset: -3px;
}

.guide-card:focus-visible,
.page-nav-link:focus-visible,
.next-link:focus-visible {
    outline-color: var(--accent-primary);
}

@media (max-width: 768px) {
    .nav {
        position: static;
        margin-top: 0;
        background: transparent;
        backdrop-filter: none;
    }

    .step-card {
        grid-template-columns: 1fr;
    }

    .content table,
    .markdown-content table {
        min-width: 34rem;
    }
}

@media print {
    .page-hero,
    .section,
    .diagram,
    .screenshot,
    .faq-item,
    .step,
    .step-card {
        box-shadow: none !important;
    }

    .faq-item:not([open]) .faq-answer {
        display: block;
    }
}

.content,
.markdown-content {
    line-height: 1.75;
}

.content h1,
.markdown-content h1,
.page-hero h1 {
    font-size: 32px;
    line-height: 1.25;
}

.content h2,
.markdown-content h2,
.section-title {
    font-size: 24px;
    line-height: 1.35;
}

.content h3,
.markdown-content h3 {
    font-size: 18px;
    line-height: 1.45;
}

.content h4,
.markdown-content h4,
.step-header h4,
.step-card .step-content h4 {
    font-size: 16px;
    line-height: 1.5;
}

.content p,
.markdown-content p,
.section > p,
.step-content p {
    margin-bottom: 1rem;
    line-height: 1.75;
}

.content strong,
.markdown-content strong,
.section strong,
.step-content strong,
.card-body strong,
.faq-answer strong {
    background: linear-gradient(transparent 60%, var(--accent-primary-soft) 60%);
    box-decoration-break: clone;
    -webkit-box-decoration-break: clone;
}

.note strong {
    width: fit-content;
}

table {
    width: 100%;
    border-collapse: collapse;
    background: var(--bg-secondary);
    color: var(--text-primary);
}

thead tr {
    border-bottom: 2px solid var(--accent-primary);
}

th,
td {
    padding: var(--spacing-sm) var(--spacing-md);
    border-bottom: 1px solid var(--border-color);
    text-align: left;
    vertical-align: top;
}

tbody tr:nth-child(even) {
    background: var(--bg-tertiary);
}

tbody tr {
    transition: background-color 0.16s ease;
}

tbody tr:hover {
    background: var(--accent-primary-tint);
}

tbody td:first-child,
tbody th:first-child {
    font-weight: 700;
}

.table-responsive {
    width: 100%;
    overflow-x: auto;
    overscroll-behavior-inline: contain;
    -webkit-overflow-scrolling: touch;
}

.note {
    display: flow-root;
    padding: 1rem 1.25rem;
    border-left-width: 4px;
    border-radius: var(--radius-md);
    line-height: 1.75;
}

.note::before {
    position: static;
    float: left;
    display: inline-flex;
    width: 1.6rem;
    height: 1.6rem;
    align-items: center;
    justify-content: center;
    margin: 0.08rem 0.7rem 0.2rem 0;
    border-radius: 50%;
    background: var(--bg-secondary);
    font-size: 1rem;
    font-weight: 900;
    line-height: 1;
    box-shadow: var(--shadow-sm);
}

.note-info::before { content: 'ℹ'; color: var(--accent-info); }
.note-warning::before { content: '⚠'; color: var(--accent-warning); }
.note-success::before { content: '✓'; color: var(--accent-success); }
.note-danger::before { content: '✕'; color: var(--accent-danger); }
.note-tip::before { content: '💡'; color: var(--accent-tip); }

.steps {
    position: relative;
}

.step,
.step-card {
    position: relative;
    transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.steps > .step:not(:last-child)::before,
.steps > .step-card:not(:last-child)::before {
    content: '';
    position: absolute;
    z-index: 2;
    left: calc(var(--spacing-lg) + 18px);
    bottom: calc(-1 * var(--spacing-lg) - 1px);
    width: 2px;
    height: calc(var(--spacing-lg) + 2px);
    background: var(--accent-primary-soft);
    pointer-events: none;
}

.step-number {
    position: relative;
    z-index: 3;
    border-radius: 50%;
    box-shadow: var(--shadow-md), 0 0 0 4px var(--accent-primary-soft);
}

.step:hover,
.step-card:hover {
    transform: translateY(-2px);
    border-color: var(--accent-primary);
    box-shadow: var(--shadow-md);
}

.card-grid {
    align-items: stretch;
}

.card {
    padding: var(--spacing-lg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    background: var(--bg-secondary);
    box-shadow: var(--shadow-sm);
    transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.card:hover {
    transform: translateY(-2px);
    border-color: var(--accent-primary);
    box-shadow: var(--shadow-md);
}

.card-title {
    margin: 0 0 var(--spacing-sm);
    color: var(--text-primary);
    font-size: 18px;
    font-weight: 700;
    line-height: 1.45;
}

.card-body {
    color: var(--text-secondary);
    line-height: 1.75;
}

.diagram,
.diagram-container {
    overflow: hidden;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    background: var(--bg-secondary);
}

.diagram-container {
    margin: var(--spacing-lg) 0;
    padding: var(--spacing-lg);
}

.diagram svg,
.diagram-container svg {
    display: block;
    max-width: 100%;
    height: auto;
    margin-inline: auto;
}

code {
    padding: 0.2em;
    border-radius: var(--radius-sm);
    background: var(--bg-tertiary);
    font-family: var(--font-mono);
}

.content pre,
.markdown-content pre,
pre,
.code-block {
    max-width: 100%;
    overflow-x: auto;
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    background: var(--bg-sidebar);
    color: var(--sidebar-text);
    font-family: var(--font-mono);
    line-height: 1.65;
}

pre code,
.code-block code {
    padding: 0;
    background: transparent;
    color: inherit;
}

.faq-question {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    width: 100%;
    padding: var(--spacing-md) var(--spacing-lg);
    color: var(--text-primary);
    font-weight: 700;
    cursor: pointer;
}

.faq-answer {
    line-height: 1.75;
}

:focus-visible {
    outline: 2px solid var(--focus-ring);
    outline-offset: 3px;
}

a,
button,
select,
summary,
[role='button'],
label[for],
input[type='button'],
input[type='submit'],
input[type='reset'],
input[type='checkbox'],
input[type='radio'] {
    cursor: pointer;
}

@media (max-width: 768px) {
    .content,
    .markdown-content,
    .markdown-content p,
    .section > p,
    .step-content p,
    .content li {
        font-size: 0.95rem;
    }

    .content h1,
    .markdown-content h1,
    .page-hero h1 { font-size: 30.4px; }
    .content h2,
    .markdown-content h2,
    .section-title { font-size: 22.8px; }
    .content h3,
    .markdown-content h3,
    .card-title { font-size: 17.1px; }
    .content h4,
    .markdown-content h4,
    .step-header h4,
    .step-card .step-content h4 { font-size: 15.2px; }

    .card-grid,
    .requirements-grid {
        grid-template-columns: 1fr;
    }

    .content table,
    .markdown-content table,
    table {
        display: block;
        width: 100%;
        min-width: 0;
        overflow-x: auto;
        overscroll-behavior-inline: contain;
        -webkit-overflow-scrolling: touch;
        white-space: nowrap;
    }
}

@media (max-width: 480px) {
    .content,
    .markdown-content,
    .markdown-content p,
    .section > p,
    .step-content p,
    .content li {
        font-size: 0.9rem;
    }

    .content h1,
    .markdown-content h1,
    .page-hero h1 { font-size: 28.8px; }
    .content h2,
    .markdown-content h2,
    .section-title { font-size: 21.6px; }
    .content h3,
    .markdown-content h3,
    .card-title { font-size: 16.2px; }
    .content h4,
    .markdown-content h4,
    .step-header h4,
    .step-card .step-content h4 { font-size: 14.4px; }

    .page-hero::after,
    .flow-arrow,
    .screenshot .shot-bar i,
    .steps > .step:not(:last-child)::before,
    .steps > .step-card:not(:last-child)::before {
        display: none;
    }

    .section,
    .step,
    .step-card,
    .diagram,
    .diagram-container {
        padding: var(--spacing-md);
    }
}

@media print {
    .sidebar,
    .sidebar-toggle,
    .sidebar-overlay,
    .back-to-top,
    .reading-progress {
        display: none !important;
    }

    .main-content,
    .content,
    .markdown-content,
    .container {
        width: 100% !important;
        max-width: none !important;
        margin: 0 !important;
        padding-inline: 0 !important;
    }

    *,
    *::before,
    *::after {
        box-shadow: none !important;
        text-shadow: none !important;
    }

    .card,
    .step,
    .step-card,
    .note {
        break-inside: avoid;
        page-break-inside: avoid;
    }

    .content table,
    .markdown-content table,
    table {
        display: table;
        min-width: 0;
        overflow: visible;
        white-space: normal;
    }
}

/* Reading hierarchy: minimal decoration, comfortable line length. */
.content { max-width: 880px; overflow-wrap: anywhere; }
.page-hero { padding: 2rem; border-radius: .8rem; box-shadow: none; background: #fff; }
.page-hero::after { display: none; }
.page-hero h1 { margin-top: .35rem; font-size: clamp(1.65rem, 3vw, 2.1rem); line-height: 1.45; }
.page-hero p { font-size: 1.05rem; }
.section { padding: 1.8rem 2rem; border-radius: .8rem; box-shadow: none; }
.section-title { margin-top: 0; font-size: 1.35rem; }
.section-number { background: var(--accent-primary-soft); color: var(--accent-primary-strong); box-shadow: none; font-size: .9rem; }
.content strong, .markdown-content strong, .section strong, .step-content strong, .card-body strong, .faq-answer strong { background: none; }
.step, .step-card { background: #f7f9fc; box-shadow: none; border-radius: .6rem; }
.step:hover, .step-card:hover, .card:hover { transform: none; box-shadow: none; border-color: var(--border-color); }
.step-number { box-shadow: none; width: 32px; height: 32px; font-size: .9rem; }
.step-header h4 { margin: .4rem 0; }
.step-content p:last-child { margin-bottom: 0; }
.steps > .step::before, .steps > .step-card::before { display: none; }
.screenshot, .figure img { box-shadow: none; border-color: var(--border-color); }
.fig-caption { padding: .5rem 1rem; }
.note { border-left-width: 3px; }
.note::before { display: none; }
.note strong { width: auto; }
.faq-item summary::before { content: none; }
.next-steps { background: var(--bg-tertiary); }
.content pre, .markdown-content pre, pre, .code-block { background: #edf2f7; color: var(--text-primary); }
.chapter-nav { display: flex; flex-wrap: wrap; gap: .5rem 1rem; padding: 1rem 0; margin-bottom: 1.5rem; border-bottom: 1px solid var(--border-color); font-size: .88rem; }
@media (max-width: 768px) {
    .page-hero, .section { padding: 1.3rem; }
    .nav { flex-wrap: wrap; gap: .5rem; }
    .nav-title { font-size: 1.05rem; }
    .content table, .markdown-content table, table { display: table; min-width: 480px; white-space: normal; }
}
@media print {
    .content table, .markdown-content table, table { min-width: 0; }
    .page-hero, .section { border: 0; padding: 1rem 0; }
    .chapter-nav { display: none; }
}