:root {
        --bg: #0b0d10;
        --bg-soft: #11141a;
        --card: #12161c;
        --card-hover: #161b22;
        --border: #232a33;
        --border-strong: #313a45;
        --text: #e8ebef;
        --text-dim: #98a1ad;
        --accent: #00d4aa;
        --accent-soft: rgba(0, 212, 170, 0.12);
        --accent-line: rgba(0, 212, 170, 0.35);
        --on-accent: #04241d;
        --mono-bg: #0d1014;
        --radius: 14px;
        --shadow: 0 1px 2px rgba(0, 0, 0, 0.5);
        --max: 1080px;
    }


    :root[data-theme="light"] {
        --bg: #fbfbfc;
        --bg-soft: #f3f5f7;
        --card: #ffffff;
        --card-hover: #ffffff;
        --border: #e3e6ea;
        --border-strong: #d3d8de;
        --text: #12161c;
        --text-dim: #5b6472;
        --accent: #00806a;
        --accent-soft: rgba(0, 128, 106, 0.09);
        --accent-line: rgba(0, 128, 106, 0.3);
        --on-accent: #ffffff;
        --mono-bg: #f6f7f9;
        --shadow: 0 1px 3px rgba(16, 24, 40, 0.07);
    }

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

    html {
        scroll-behavior: smooth;
    }

    body {
        background: var(--bg);
        color: var(--text);
        font-family: 'Inter', 'Segoe UI', system-ui, -apple-system, sans-serif;
        line-height: 1.65;
        -webkit-font-smoothing: antialiased;
        min-height: 100vh;
    }

    a {
        color: var(--accent);
        text-decoration: none;
    }

    a:hover {
        text-decoration: underline;
    }

    :focus-visible {
        outline: 2px solid var(--accent);
        outline-offset: 2px;
        border-radius: 4px;
    }

    .wrap {
        max-width: var(--max);
        margin: 0 auto;
        padding: 0 24px;
    }

    /* ---------- top bar ---------- */

    .topbar {
        position: sticky;
        top: 0;
        z-index: 20;
        background: var(--bg);
        background: color-mix(in srgb, var(--bg) 82%, transparent);
        backdrop-filter: blur(12px);
        -webkit-backdrop-filter: blur(12px);
        border-bottom: 1px solid var(--border);
    }

    .topbar-inner {
        max-width: var(--max);
        margin: 0 auto;
        padding: 12px 24px;
        display: flex;
        align-items: center;
        justify-content: space-between;
        gap: 16px;
    }

    .brand {
        display: flex;
        align-items: center;
        gap: 10px;
        color: var(--text);
        font-weight: 600;
        font-size: 0.95rem;
    }

    .brand:hover {
        text-decoration: none;
    }

    .brand-mark {
        width: 26px;
        height: 26px;
        flex: none;
        display: block;
        border-radius: 7px;
    }


    .brand-sep {
        color: var(--border-strong);
        font-weight: 400;
    }

    .brand-page {
        color: var(--text-dim);
        font-weight: 500;
    }

    .topbar-actions {
        display: flex;
        align-items: center;
        gap: 8px;
    }


    .icon-btn {
        width: 34px;
        height: 34px;
        display: grid;
        place-items: center;
        border: 1px solid var(--border);
        border-radius: 10px;
        background: transparent;
        color: var(--text-dim);
        cursor: pointer;
        transition: color 0.15s, border-color 0.15s, background 0.15s;
    }

    .icon-btn:hover {
        color: var(--text);
        border-color: var(--border-strong);
        background: var(--bg-soft);
    }

    .icon-btn svg {
        width: 16px;
        height: 16px;
        pointer-events: none;
    }

    :root[data-theme="light"] .i-moon,
    :root:not([data-theme="light"]) .i-sun {
        display: none;
    }

    /* ---------- hero ---------- */

    .hero {
        position: relative;
        padding: 88px 24px 56px;
        text-align: center;
        overflow: hidden;
    }

    .hero::before {
        content: "";
        position: absolute;
        left: 50%;
        top: -240px;
        width: 900px;
        height: 620px;
        transform: translateX(-50%);
        background: radial-gradient(50% 50% at 50% 50%, var(--accent-soft), transparent 68%);
        pointer-events: none;
    }

    .hero > * {
        position: relative;
    }

    .eyebrow {
        display: inline-flex;
        align-items: center;
        gap: 8px;
        font-size: 0.75rem;
        font-weight: 600;
        letter-spacing: 0.12em;
        text-transform: uppercase;
        color: var(--accent);
        background: var(--accent-soft);
        border: 1px solid var(--accent-line);
        padding: 6px 14px;
        border-radius: 999px;
        margin-bottom: 26px;
    }

    h1 {
        font-size: clamp(2rem, 5.2vw, 3.2rem);
        font-weight: 700;
        letter-spacing: -0.025em;
        line-height: 1.12;
        max-width: 15ch;
        margin: 0 auto 20px;
    }

    .lede {
        font-size: clamp(1rem, 1.6vw, 1.12rem);
        color: var(--text-dim);
        max-width: 62ch;
        margin: 0 auto 28px;
    }

    .chips {
        display: flex;
        flex-wrap: wrap;
        justify-content: center;
        gap: 8px;
        margin-bottom: 34px;
    }

    .chip {
        font-size: 0.82rem;
        color: var(--text-dim);
        border: 1px solid var(--border);
        border-radius: 999px;
        padding: 5px 13px;
        background: var(--bg-soft);
    }

    .chip strong {
        color: var(--text);
        font-weight: 600;
    }

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

    .btn {
        display: inline-flex;
        align-items: center;
        gap: 8px;
        font-size: 0.92rem;
        font-weight: 600;
        padding: 11px 20px;
        border-radius: 10px;
        border: 1px solid transparent;
        cursor: pointer;
        transition: transform 0.12s, background 0.15s, border-color 0.15s, color 0.15s;
    }

    .btn:hover {
        text-decoration: none;
        transform: translateY(-1px);
    }

    .btn-primary {
        background: var(--accent);
        color: var(--on-accent);
    }

    .btn-primary:hover {
        background: var(--accent);
        filter: brightness(1.08);
    }

    .btn-ghost {
        background: transparent;
        color: var(--text);
        border-color: var(--border-strong);
    }

    .btn-ghost:hover {
        background: var(--bg-soft);
        color: var(--text);
    }

    .btn svg {
        width: 15px;
        height: 15px;
    }

    .canonical {
        font-family: ui-monospace, SFMono-Regular, 'SF Mono', Menlo, Consolas, monospace;
        font-size: 0.82rem;
        color: var(--text-dim);
    }

    .canonical a {
        color: var(--text-dim);
        text-decoration: underline;
        text-underline-offset: 3px;
    }

    /* ---------- deed (mbox) ---------- */

    .mbox {
        display: flex;
        gap: 16px;
        border: 1px solid var(--border);
        background: var(--bg-soft);
        padding: 18px 20px;
        margin-bottom: 48px;
        font-size: 0.95rem;
    }

    .mbox-image {
        flex: none;
    }

    .mbox-image img {
        display: block;
        width: 40px;
        height: 40px;
    }

    .mbox-text {
        flex: 1;
        min-width: 0;
    }

    .deed-title {
        text-align: center;
        font-size: 1.25rem;
        font-weight: 700;
        padding: 0.3em 0;
    }

    .deed-sub {
        text-align: center;
        color: var(--text-dim);
        font-size: 0.92rem;
        margin-bottom: 18px;
    }

    .mbox-text > p {
        font-weight: 600;
        margin-bottom: 10px;
    }

    .mbox-text ul {
        margin: 0 0 18px 1.5em;
        padding-left: 1.1em;
        list-style: disc;
    }

    .mbox-text li {
        margin-bottom: 7px;
        color: var(--text-dim);
    }

    .mbox-text li strong {
        color: var(--text);
    }

    .mbox-text dl {
        margin: 0 0 2px 1.5em;
        color: var(--text-dim);
    }

    .mbox-text dd {
        margin-bottom: 8px;
    }

    /* ---------- document ---------- */

    .doc {
        background: var(--card);
        border: 1px solid var(--border);
        border-radius: var(--radius);
        box-shadow: var(--shadow);
        overflow: hidden;
        margin-bottom: 64px;
    }

    .doc-head {
        display: flex;
        align-items: center;
        justify-content: space-between;
        gap: 16px;
        flex-wrap: wrap;
        padding: 18px 24px;
        border-bottom: 1px solid var(--border);
        background: var(--bg-soft);
    }

    .doc-head h2 {
        font-size: 1rem;
        font-weight: 650;
        letter-spacing: -0.01em;
    }

    .doc-head p {
        font-size: 0.82rem;
        color: var(--text-dim);
    }

    .doc-body {
        padding: 30px 32px 36px;
        font-family: ui-monospace, SFMono-Regular, 'SF Mono', Menlo, Consolas, monospace;
        font-size: 0.82rem;
        line-height: 1.72;
        white-space: pre-wrap;
        overflow-wrap: break-word;
        background: var(--mono-bg);
    }

    .doc-body .keyword {
        color: var(--accent);
        font-weight: 700;
    }

    .doc-body::-webkit-scrollbar {
        height: 8px;
    }

    .doc-body::-webkit-scrollbar-track {
        background: transparent;
    }

    .doc-body::-webkit-scrollbar-thumb {
        background: var(--border-strong);
        border-radius: 4px;
    }

    .doc-foot {
        display: flex;
        flex-wrap: wrap;
        gap: 10px;
        padding: 18px 24px;
        border-top: 1px solid var(--border);
        background: var(--bg-soft);
    }

    /* ---------- faq ---------- */

    .section-title {
        font-size: 1.35rem;
        font-weight: 650;
        letter-spacing: -0.02em;
        margin-bottom: 8px;
    }

    .section-sub {
        color: var(--text-dim);
        font-size: 0.95rem;
        margin-bottom: 26px;
    }

    .faq {
        margin-bottom: 64px;
    }

    .faq details {
        border-bottom: 1px solid var(--border);
    }

    .faq details:first-of-type {
        border-top: 1px solid var(--border);
    }

    .faq summary {
        list-style: none;
        cursor: pointer;
        padding: 17px 34px 17px 0;
        position: relative;
        font-weight: 600;
        font-size: 0.97rem;
        transition: color 0.15s;
    }

    .faq summary::-webkit-details-marker {
        display: none;
    }

    .faq summary:hover {
        color: var(--accent);
    }

    .faq summary::after {
        content: "+";
        position: absolute;
        right: 6px;
        top: 50%;
        transform: translateY(-50%);
        font-size: 1.15rem;
        font-weight: 400;
        color: var(--text-dim);
        transition: transform 0.18s;
    }

    .faq details[open] summary::after {
        content: "\2212";
    }

    .faq details p {
        padding: 0 0 19px;
        color: var(--text-dim);
        font-size: 0.94rem;
        max-width: 84ch;
    }

    /* ---------- notice ---------- */

    .notice {
        border: 1px solid var(--border);
        border-left: 3px solid var(--accent);
        border-radius: 0 var(--radius) var(--radius) 0;
        background: var(--bg-soft);
        padding: 26px 28px;
        margin-bottom: 72px;
    }

    .notice h2 {
        font-size: 1rem;
        font-weight: 650;
        margin-bottom: 12px;
    }

    .notice p {
        color: var(--text-dim);
        font-size: 0.92rem;
        margin-bottom: 12px;
    }

    .notice p:last-child {
        margin-bottom: 0;
    }

    /* ---------- footer ---------- */

    footer {
        border-top: 1px solid var(--border);
        padding: 30px 0 46px;
    }

    .foot-guide {
        font-size: 0.94rem;
        margin-bottom: 18px;
    }

    .foot-links {
        display: flex;
        flex-wrap: wrap;
        gap: 8px 18px;
        font-size: 0.9rem;
        margin-bottom: 12px;
    }

    .foot-note {
        color: var(--text-dim);
        font-size: 0.84rem;
    }

    @media (max-width: 860px) {
        .hero {
            padding: 64px 24px 44px;
        }

        .mbox {
            padding: 14px 16px;
            gap: 12px;
        }

        .deed-title {
            font-size: 1.1rem;
        }

        .doc-head,
        .doc-foot {
            padding: 16px 20px;
        }
    }

    /* The canonical text is hard-wrapped at 78 columns: below this width,
       keep its indentation intact and scroll instead of re-wrapping. */
    @media (max-width: 820px) {
        .doc-body {
            padding: 22px 20px 26px;
            font-size: 0.74rem;
            white-space: pre;
            overflow-wrap: normal;
            overflow-x: auto;
            -webkit-overflow-scrolling: touch;
        }
    }

    /* ---------- license page (legalcode) ---------- */

    .legal-head {
        text-align: center;
        padding: 64px 0 36px;
    }

    .legal-head h1 {
        font-size: clamp(1.7rem, 4.2vw, 2.5rem);
        max-width: 22ch;
        margin: 0 auto 14px;
    }

    .legal-meta {
        font-family: ui-monospace, SFMono-Regular, 'SF Mono', Menlo, Consolas, monospace;
        font-size: 0.84rem;
        color: var(--text-dim);
        line-height: 1.9;
    }

    .legal-meta a {
        color: var(--text-dim);
        text-decoration: underline;
        text-underline-offset: 3px;
    }

    @media (max-width: 860px) {
        .legal-head {
            padding: 44px 0 28px;
        }
    }

    /* ---------- language switcher ---------- */

    .lang-switch select {
        font: inherit;
        font-size: 0.86rem;
        color: var(--text-dim);
        background: var(--bg-soft);
        border: 1px solid var(--border);
        border-radius: 10px;
        padding: 6px 8px;
        max-width: 150px;
        cursor: pointer;
    }

    .lang-switch select:hover {
        color: var(--text);
        border-color: var(--border-strong);
    }

    .sr-only {
        position: absolute;
        width: 1px;
        height: 1px;
        overflow: hidden;
        clip: rect(0 0 0 0);
        white-space: nowrap;
    }

    .translation-note {
        max-width: 62ch;
        margin: 14px auto 0;
        font-size: 0.86rem;
        color: var(--text-dim);
    }

    [dir="rtl"] .mbox {
        flex-direction: row-reverse;
    }

    @media (max-width: 520px) {
        .topbar-inner {
            padding: 10px 16px;
            gap: 10px;
        }

        .brand-sep,
        .brand-page {
            display: none;
        }

        .topbar-actions {
            gap: 6px;
        }

        .lang-switch select {
            max-width: 112px;
            font-size: 0.8rem;
            padding: 6px;
        }

        .topbar-actions .btn {
            padding: 10px 14px;
        }
    }