:root {
    --background: #0e0d13;
    --surface: #17151f;
    --surface-2: #1d1928;
    --surface-3: #211c2c;
    --border: #332d41;
    --text: #f0edf4;
    --muted: #a8a0b4;
    --accent: #d3b4ff;
    --accent-2: #8edbcf;
    --gold: #e7c478;
    --radius: 16px;
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    background:
        radial-gradient(circle at 18% 0%, rgba(211, 180, 255, 0.1), transparent 32rem),
        radial-gradient(circle at 86% 20%, rgba(142, 219, 207, 0.055), transparent 30rem),
        var(--background);
    color: var(--text);
    font-family: "Segoe UI", "Yu Gothic UI", system-ui, -apple-system, sans-serif;
    line-height: 1.9;
}

a {
    color: var(--accent);
    text-underline-offset: 0.2em;
}

a:hover {
    color: #eadcff;
}

.wrap {
    width: min(1160px, calc(100% - 40px));
    margin: 0 auto;
}

.article-width {
    width: min(840px, 100%);
}

.appendix-page .article-width {
    width: min(1120px, 100%);
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 20;
    background: rgba(14, 13, 19, 0.86);
    border-bottom: 1px solid rgba(255, 255, 255, 0.07);
    backdrop-filter: blur(14px);
}

.header-inner {
    min-height: 76px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
}

.site-logo,
.eyebrow,
.tool-cta-label,
code {
    font-family: Consolas, "Courier New", monospace;
}

.site-logo {
    color: var(--text);
    font-weight: 700;
    text-decoration: none;
}

.site-nav,
.footer-links {
    display: flex;
    gap: 20px;
}

.site-nav a,
.footer-links a {
    color: var(--muted);
    font-size: 0.94rem;
    text-decoration: none;
}

.site-nav a:hover,
.footer-links a:hover {
    color: var(--text);
}

.article-hero {
    padding: 112px 0 78px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.07);
}

.appendix-page .article-hero {
    padding: 84px 0 62px;
}

.eyebrow-row {
    display: flex;
    align-items: center;
    gap: 18px;
}

.eyebrow {
    margin: 0;
    color: var(--accent-2);
    font-size: 0.83rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
}

.language-link {
    margin-left: auto;
    color: var(--muted);
    font-family: Consolas, "Courier New", monospace;
    font-size: 0.88rem;
    text-decoration: none;
}

.language-link:hover {
    color: var(--accent);
}

.article-hero h1 {
    margin: 22px 0 0;
    max-width: 980px;
    font-size: clamp(2.35rem, 6vw, 4.7rem);
    line-height: 1.12;
    letter-spacing: -0.045em;
}

.appendix-page .article-hero h1 {
    font-size: clamp(2.1rem, 5vw, 3.8rem);
}

.subtitle {
    margin: 22px 0 0;
    color: var(--muted);
    font-size: clamp(1rem, 2vw, 1.18rem);
}

.article-body {
    padding: 54px 0 112px;
}

.article-body > p,
.article-body > ul {
    margin: 0 0 22px;
}

.article-body h2 {
    margin: 82px 0 30px;
    padding-top: 14px;
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    font-size: clamp(1.55rem, 4vw, 2.15rem);
    line-height: 1.4;
    letter-spacing: -0.025em;
}

.article-body h3 {
    margin: 52px 0 22px;
    color: #e5dcf1;
    font-size: clamp(1.2rem, 3vw, 1.5rem);
    line-height: 1.5;
}

.article-body h2:first-child {
    margin-top: 18px;
}

.article-body strong {
    color: #fff;
}

.article-body ul {
    padding-left: 1.4rem;
}

.article-body li {
    margin-bottom: 9px;
}

.article-body hr {
    margin: 68px 0;
    border: 0;
    border-top: 1px solid var(--border);
}

code {
    padding: 0.16em 0.42em;
    background: rgba(255, 255, 255, 0.065);
    border-radius: 5px;
    color: #e8dcff;
}

.anchor {
    display: block;
    scroll-margin-top: 96px;
}

.table-wrap {
    width: 100%;
    margin: 30px 0 36px;
    overflow-x: auto;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--surface);
    box-shadow: 0 12px 36px rgba(0, 0, 0, 0.16);
}

table {
    width: 100%;
    min-width: 560px;
    border-collapse: collapse;
}

.appendix-page table {
    min-width: 940px;
    font-size: 0.9rem;
}

th,
td {
    padding: 13px 16px;
    border-bottom: 1px solid var(--border);
    text-align: left;
    vertical-align: top;
}

th {
    color: #c8bfD2;
    background: var(--surface-2);
    font-size: 0.84rem;
    line-height: 1.55;
}

tbody tr:nth-child(even) {
    background: rgba(255, 255, 255, 0.018);
}

tbody tr:hover {
    background: rgba(211, 180, 255, 0.045);
}

tr:last-child td {
    border-bottom: 0;
}

.math {
    margin: 30px 0;
    padding: 22px 24px;
    overflow-x: auto;
    background:
        linear-gradient(135deg, rgba(211, 180, 255, 0.09), rgba(142, 219, 207, 0.035)),
        var(--surface);
    border: 1px solid rgba(211, 180, 255, 0.24);
    border-radius: var(--radius);
    color: #f7f1ff;
    text-align: center;
}

.tool-cta {
    margin: 38px 0;
    padding: 26px;
    background:
        linear-gradient(135deg, rgba(211, 180, 255, 0.13), rgba(142, 219, 207, 0.07)),
        var(--surface-2);
    border: 1px solid rgba(211, 180, 255, 0.32);
    border-radius: var(--radius);
}

.tool-cta p {
    margin: 0 0 16px;
}

.tool-cta-label {
    color: var(--accent-2);
    font-size: 0.8rem;
    letter-spacing: 0.12em;
}

.tool-cta-links {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.tool-cta-links a {
    display: inline-flex;
    align-items: center;
    min-height: 44px;
    padding: 9px 15px;
    background: var(--accent);
    border-radius: 8px;
    color: #171020;
    font-weight: 700;
    text-decoration: none;
}

.tool-cta-links a:nth-child(2) {
    background: var(--accent-2);
}

.tool-cta-links a:hover {
    filter: brightness(1.08);
}

.site-footer {
    padding: 30px 0 42px;
    border-top: 1px solid rgba(255, 255, 255, 0.07);
}

.footer-inner {
    display: flex;
    justify-content: space-between;
    gap: 20px;
    color: var(--muted);
    font-size: 0.9rem;
}

@media (max-width: 760px) {
    .wrap {
        width: min(100% - 28px, 1160px);
    }

    .header-inner {
        min-height: auto;
        padding: 14px 0;
        align-items: flex-start;
        flex-direction: column;
        gap: 10px;
    }

    .site-nav {
        gap: 16px;
    }

    .article-hero,
    .appendix-page .article-hero {
        padding: 68px 0 52px;
    }

    .article-body {
        padding-top: 38px;
    }

    .article-body h2 {
        margin-top: 62px;
    }

    .table-wrap {
        width: calc(100vw - 14px);
        margin-left: calc((100vw - 100%) / -2 + 7px);
        border-radius: 12px 0 0 12px;
    }

    th,
    td {
        padding: 11px 12px;
    }

    .math,
    .tool-cta {
        padding: 20px 18px;
    }

    .tool-cta-links {
        flex-direction: column;
    }

    .tool-cta-links a {
        justify-content: center;
    }

    .footer-inner {
        flex-direction: column;
    }
}

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }
}