:root {
    --manual-primary: #0f6f8f;
    --manual-primary-dark: #0b4f66;
    --manual-accent: #20a7c9;
    --manual-soft: #eef8fb;
    --manual-border: #d9e7ec;
    --manual-text: #24333a;
    --manual-muted: #6c7a80;
    --manual-bg: #f6f9fb;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Sans", "Yu Gothic", "Meiryo", sans-serif;
    color: var(--manual-text);
    background: var(--manual-bg);
    line-height: 1.85;
}

.manual-hero {
    position: relative;
    overflow: hidden;
    color: #fff;
    background:
        radial-gradient(circle at 85% 15%, rgba(255,255,255,.22), transparent 28%),
        linear-gradient(135deg, #08384a 0%, #0f6f8f 58%, #1aa7c8 100%);
}

.manual-hero::after {
    content: "";
    position: absolute;
    inset: auto -12% -36% -12%;
    height: 260px;
    background: rgba(255,255,255,.12);
    transform: rotate(-4deg);
}

.manual-eyebrow {
    display: inline-flex;
    align-items: center;
    gap: .5rem;
    padding: .35rem .8rem;
    margin-bottom: 1rem;
    border-radius: 999px;
    background: rgba(255,255,255,.16);
    border: 1px solid rgba(255,255,255,.26);
    font-size: .85rem;
    font-weight: 700;
    letter-spacing: .08em;
    text-transform: uppercase;
}

.manual-summary-card {
    position: relative;
    z-index: 1;
    background: rgba(255,255,255,.95);
    color: var(--manual-text);
    padding: 1.25rem;
    border-radius: 1.25rem;
    box-shadow: 0 1.25rem 3rem rgba(0,0,0,.18);
}

.manual-page {
    padding: 2rem 0 4rem;
}

.manual-shell {
    max-width: 1540px;
}

.manual-sidebar {
    padding: 0 1.25rem 0 1.75rem;
}

.manual-toc {
    top: 1rem;
    max-height: calc(100vh - 2rem);
    overflow: auto;
    padding: 1.25rem;
    border: 1px solid var(--manual-border);
    border-radius: 1.25rem;
    background: #fff;
    box-shadow: 0 .75rem 2rem rgba(15, 111, 143, .08);
}

.toc-title {
    font-weight: 800;
    color: var(--manual-primary-dark);
    margin-bottom: .75rem;
    padding-bottom: .75rem;
    border-bottom: 1px solid var(--manual-border);
}

.toc-link {
    display: block;
    padding: .35rem .6rem;
    margin: .05rem 0;
    border-radius: .55rem;
    color: #44545b;
    text-decoration: none;
    font-size: .92rem;
    line-height: 1.45;
    border-left: 3px solid transparent;
}

.toc-link:hover,
.toc-link.active {
    color: var(--manual-primary-dark);
    background: var(--manual-soft);
    border-left-color: var(--manual-accent);
}

.toc-level-1 { font-weight: 800; margin-top: .6rem; }
.toc-level-2 { padding-left: 1rem; }
.toc-level-3 { padding-left: 1.6rem; font-size: .86rem; }
.toc-level-4 { padding-left: 2.1rem; font-size: .82rem; color: var(--manual-muted); }

.manual-content-wrap {
    padding: 0 1.75rem 0 .75rem;
}

.manual-content {
    border-radius: 1.5rem;
}

.anchor-offset {
    scroll-margin-top: 1.5rem;
}

.chapter-title,
.section-title,
.subsection-title,
.small-title {
    color: var(--manual-primary-dark);
    font-weight: 800;
    letter-spacing: -.015em;
}

.chapter-title {
    position: relative;
    margin: 3rem 0 1.35rem;
    padding: 1.25rem 1.5rem;
    border-radius: 1rem;
    background: linear-gradient(135deg, var(--manual-soft), #fff);
    border: 1px solid var(--manual-border);
}

.chapter-title:first-of-type {
    margin-top: 0;
}

.section-title {
    margin: 2.4rem 0 1rem;
    padding-bottom: .55rem;
    border-bottom: 2px solid var(--manual-border);
}

.subsection-title {
    margin: 2rem 0 .85rem;
    font-size: 1.28rem;
}

.small-title {
    margin: 1.5rem 0 .75rem;
    font-size: 1.08rem;
}

.manual-content p {
    margin-bottom: 1rem;
}

.manual-list {
    padding-left: 1.1rem;
    margin: 1rem 0 1.35rem;
}

.manual-list li {
    margin-bottom: .65rem;
    padding-left: .25rem;
}

.manual-step {
    display: grid;
    grid-template-columns: 2.45rem minmax(0, 1fr);
    gap: .9rem;
    margin: 1rem 0 1.35rem;
    padding: 1rem;
    border: 1px solid var(--manual-border);
    border-radius: 1rem;
    background: #fff;
    box-shadow: 0 .5rem 1.5rem rgba(15, 111, 143, .06);
}

.manual-step-number {
    width: 2.45rem;
    height: 2.45rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    font-weight: 800;
    color: #fff;
    background: linear-gradient(135deg, var(--manual-primary), var(--manual-accent));
    box-shadow: 0 .5rem 1rem rgba(15, 111, 143, .18);
}

.manual-step-content p:last-child {
    margin-bottom: 0;
}

.manual-figure {
    margin: 1rem 0 1.35rem;
    padding: .9rem;
    border: 1px solid var(--manual-border);
    border-radius: 1rem;
    background: #fdfefe;
}

.manual-figure img {
    width: 100%;
    height: auto;
    border-radius: .75rem;
    border: 1px solid #e9eef1;
    background: #fff;
}

.manual-figure figcaption {
    display: flex;
    flex-wrap: wrap;
    gap: .5rem;
    justify-content: space-between;
    align-items: center;
    margin-top: .75rem;
    color: var(--manual-muted);
    font-size: .86rem;
}

.figure-file-name {
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
    color: var(--manual-primary-dark);
    background: var(--manual-soft);
    border: 1px solid var(--manual-border);
    border-radius: .5rem;
    padding: .15rem .45rem;
    word-break: break-all;
}

.manual-mobile-toc .card {
    border: 1px solid var(--manual-border);
    border-radius: 1rem;
}

.manual-back-top {
    position: fixed;
    right: 1.25rem;
    bottom: 1.25rem;
    width: 2.6rem;
    height: 2.6rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    text-decoration: none;
    color: #fff;
    background: var(--manual-primary);
    box-shadow: 0 .7rem 1.5rem rgba(0,0,0,.18);
}

@media (max-width: 991.98px) {
    .manual-page { padding-top: 1.25rem; }
    .manual-content-wrap { padding: 0 1rem; }
    .manual-step { grid-template-columns: 2.2rem minmax(0, 1fr); padding: .85rem; }
    .manual-step-number { width: 2.2rem; height: 2.2rem; }
    .chapter-title { font-size: 1.4rem; padding: 1rem; }
}

@media print {
    .manual-sidebar,
    .manual-mobile-toc,
    .manual-back-top,
    .manual-summary-card { display: none !important; }
    .manual-page { padding: 0; }
    .manual-content-wrap { width: 100%; padding: 0; }
    .manual-content { box-shadow: none !important; border: 0 !important; }
    a { color: inherit; text-decoration: none; }
    .manual-step, .manual-figure { break-inside: avoid; box-shadow: none; }
}