:root {
    color-scheme: dark;
    --bg: #070b12;
    --bg-deep: #04070c;
    --panel: rgba(15, 23, 34, 0.82);
    --text: #f2f5f8;
    --muted: #aeb8c5;
    --line: rgba(147, 167, 190, 0.22);
    --accent: #61c8ff;
    --accent-soft: rgba(97, 200, 255, 0.12);
    --shadow: 0 18px 55px rgba(0, 0, 0, 0.38);
}

* {
    box-sizing: border-box;
}

html {
    min-height: 100%;
    scroll-behavior: smooth;
    background: var(--bg-deep);
}

body {
    min-height: 100vh;
    margin: 0;
    color: var(--text);
    background:
        radial-gradient(circle at 50% 0%, rgba(34, 92, 132, 0.18), transparent 34%),
        linear-gradient(180deg, var(--bg) 0%, var(--bg-deep) 100%);
    font-family:
        -apple-system,
        BlinkMacSystemFont,
        "Segoe UI",
        "Hiragino Kaku Gothic ProN",
        "Yu Gothic",
        Meiryo,
        sans-serif;
}

a {
    color: inherit;
}

.site-header {
    border-bottom: 1px solid rgba(147, 167, 190, 0.14);
    background: rgba(4, 7, 12, 0.82);
    backdrop-filter: blur(12px);
}

.site-header__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: min(980px, calc(100% - 32px));
    min-height: 68px;
    margin: 0 auto;
}

.site-title {
    color: #eef9ff;
    font-size: 22px;
    font-weight: 900;
    letter-spacing: 0.07em;
    text-decoration: none;
    text-shadow:
        0 0 10px rgba(97, 200, 255, 0.44),
        0 0 24px rgba(42, 168, 239, 0.24);
}

.back-link {
    color: var(--muted);
    font-size: 14px;
    text-decoration: none;
}

.back-link:hover,
.back-link:focus-visible {
    color: var(--accent);
}

.manual {
    width: min(940px, calc(100% - 32px));
    margin: 0 auto;
    padding: 54px 0 72px;
}

.manual-hero {
    margin-bottom: 38px;
    text-align: center;
}

.manual-hero__label {
    margin: 0 0 10px;
    color: var(--accent);
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.18em;
}

.manual-hero h1 {
    margin: 0;
    font-size: clamp(32px, 6vw, 52px);
    letter-spacing: 0.05em;
}

.manual-hero__description {
    margin: 18px 0 0;
    color: var(--muted);
    font-size: 16px;
    line-height: 1.8;
}

.manual-nav {
    margin-bottom: 36px;
    padding: 26px;
    border: 1px solid var(--line);
    border-radius: 14px;
    background: var(--panel);
    box-shadow: var(--shadow);
}

.manual-nav__title {
    margin: 0 0 18px;
    font-size: 20px;
}

.manual-nav__links {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 10px;
}

.manual-nav__links a {
    display: flex;
    align-items: center;
    gap: 12px;
    min-height: 54px;
    padding: 12px 15px;
    border: 1px solid rgba(147, 167, 190, 0.15);
    border-radius: 9px;
    color: #dfe7ee;
    background: rgba(7, 12, 19, 0.45);
    font-weight: 700;
    text-decoration: none;
    transition:
        border-color 0.18s ease,
        background-color 0.18s ease,
        transform 0.18s ease;
}

.manual-nav__links a:hover,
.manual-nav__links a:focus-visible {
    border-color: rgba(97, 200, 255, 0.5);
    background: var(--accent-soft);
    transform: translateY(-1px);
}

.manual-nav__number {
    color: var(--accent);
    font-size: 16px;
    letter-spacing: 0.08em;
}

.manual-section {
    scroll-margin-top: 24px;
    margin-bottom: 28px;
    padding: 32px;
    border: 1px solid var(--line);
    border-radius: 14px;
    background: var(--panel);
    box-shadow: var(--shadow);
}

.manual-section__heading {
    display: flex;
    align-items: center;
    gap: 18px;
    padding-bottom: 20px;
    border-bottom: 1px solid rgba(147, 167, 190, 0.16);
}

.manual-section__number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex: 0 0 56px;
    width: 56px;
    height: 56px;
    border: 1px solid rgba(97, 200, 255, 0.35);
    border-radius: 50%;
    color: var(--accent);
    background: var(--accent-soft);
    font-size: 15px;
    font-weight: 800;
    letter-spacing: 0.08em;
}

.manual-section__label {
    margin: 0 0 5px;
    color: var(--accent);
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.15em;
}

.manual-section h2 {
    margin: 0;
    font-size: clamp(24px, 4vw, 32px);
}

.manual-section__lead {
    margin: 24px 0;
    color: #d3dbe4;
    font-size: 16px;
    line-height: 1.9;
}

.step-list {
    display: grid;
    gap: 14px;
}

.step-card {
    display: flex;
    gap: 18px;
    padding: 20px;
    border: 1px solid rgba(147, 167, 190, 0.14);
    border-radius: 10px;
    background: rgba(6, 11, 18, 0.48);
}

.step-card__number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex: 0 0 36px;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    color: #031018;
    background: var(--accent);
    font-weight: 900;
}

.step-card h3 {
    margin: 4px 0 8px;
    font-size: 18px;
}

.step-card p {
    margin: 0;
    color: #c9d2dc;
    font-size: 15px;
    line-height: 1.85;
}

.manual-note {
    margin-top: 20px;
    padding: 18px 20px;
    border-left: 4px solid var(--accent);
    border-radius: 6px;
    color: #d7e0e8;
    background: var(--accent-soft);
    line-height: 1.85;
}

.manual-note strong {
    display: block;
    margin-bottom: 4px;
    color: var(--text);
}

.manual-note.important{
    border-left:6px solid #ff4d4d;
    background:rgba(255,77,77,.12);
}

.manual-note.important strong{
    color:#ffb3b3;
    font-size:1.1em;
}

.manual-placeholder {
    padding: 26px;
    border: 1px dashed rgba(147, 167, 190, 0.28);
    border-radius: 9px;
    color: var(--muted);
    background: rgba(5, 9, 15, 0.38);
    text-align: center;
}

.faq-list {
    display: grid;
    gap: 12px;
}

.faq-list details {
    border: 1px solid rgba(147, 167, 190, 0.16);
    border-radius: 9px;
    background: rgba(6, 11, 18, 0.48);
}

.faq-list summary {
    padding: 17px 20px;
    cursor: pointer;
    font-weight: 700;
    line-height: 1.6;
}

.faq-list details[open] summary {
    color: var(--accent);
    border-bottom: 1px solid rgba(147, 167, 190, 0.14);
}

.faq-list p {
    margin: 0;
    padding: 18px 20px 20px;
    color: #c9d2dc;
    line-height: 1.85;
}

.page-top-link {
    display: table;
    margin: 26px 0 0 auto;
    color: var(--muted);
    font-size: 13px;
    text-decoration: none;
}

.page-top-link:hover,
.page-top-link:focus-visible {
    color: var(--accent);
}

.footer {
    padding: 28px 20px 32px;
    border-top: 1px solid rgba(147, 167, 190, 0.13);
    color: var(--muted);
    text-align: center;
    background: rgba(3, 6, 10, 0.68);
}

.footer__links {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 10px 22px;
}

.footer__links a {
    color: var(--muted);
    font-size: 16px;
    text-decoration: none;
}

.footer__links a:hover,
.footer__links a:focus-visible {
    color: var(--accent);
}

.footer__copyright {
    margin: 18px 0 0;
    font-size: 12px;
}

@media (max-width: 700px) {
    .site-header__inner {
        width: min(100% - 24px, 940px);
        min-height: 60px;
    }

    .site-title {
        font-size: 18px;
    }

    .back-link {
        font-size: 13px;
    }

    .manual {
        width: min(100% - 24px, 940px);
        padding: 38px 0 54px;
    }

    .manual-hero {
        margin-bottom: 28px;
    }

    .manual-nav {
        padding: 18px;
    }

    .manual-nav__links {
        grid-template-columns: 1fr;
    }

    .manual-section {
        padding: 22px 18px;
    }

    .manual-section__heading {
        align-items: flex-start;
        gap: 14px;
    }

    .manual-section__number {
        flex-basis: 46px;
        width: 46px;
        height: 46px;
        font-size: 13px;
    }

    .manual-section__lead {
        margin: 20px 0;
    }

    .step-card {
        gap: 13px;
        padding: 17px 15px;
    }

    .step-card__number {
        flex-basis: 32px;
        width: 32px;
        height: 32px;
    }

    .step-card h3 {
        font-size: 17px;
    }

    .step-card p {
        font-size: 14px;
    }
}

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        scroll-behavior: auto !important;
        transition: none !important;
    }
}