/* Reading pages: one calm column, like an e-reader. Themes: paper (default), sepia, night. */
:root {
    --fs: 21px;
    --bg: #fbf8f1; --ink: #1d2540; --soft: #4a5370; --muted: #6b7390; --line: rgba(29, 37, 64, .16);
    --accent: #0e7c7b; --mark: #f4a300; --card: #f3ede0; --btn-bg: #1b2a4e; --btn-ink: #fff8ea;
    --serif: 'Spectral', Georgia, 'Times New Roman', serif;
    --sans: 'Public Sans', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
}
:root[data-theme="sepia"] { --bg: #f3e9d2; --ink: #3a2e1f; --soft: #5b4a34; --muted: #7d6a50; --line: rgba(58, 46, 31, .2); --accent: #8a4b18; --card: #eadcbc; --btn-bg: #5b3a17; --btn-ink: #fdf3dc; }
:root[data-theme="night"] { --bg: #14171f; --ink: #e6e2d6; --soft: #c2bdae; --muted: #9a9585; --line: rgba(230, 226, 214, .18); --accent: #f4a300; --card: #1c202b; --btn-bg: #f4a300; --btn-ink: #14171f; }

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body { margin: 0; background: var(--bg); color: var(--ink); font-family: var(--serif); transition: background .25s, color .25s; }
a { color: var(--accent); text-underline-offset: 3px; text-decoration-thickness: 1px; }
a:hover { text-decoration-thickness: 2px; }
img { max-width: 100%; height: auto; display: block; }
:focus-visible { outline: 3px solid var(--mark); outline-offset: 2px; }

.rd-progress { position: fixed; inset: 0 auto auto 0; height: 3px; width: 0; background: var(--mark); z-index: 60; }

.rd-top { position: sticky; top: 0; z-index: 50; display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 12px max(16px, calc((100vw - 1040px) / 2)); background: color-mix(in srgb, var(--bg) 92%, transparent); backdrop-filter: blur(8px); border-bottom: 1px solid var(--line); font-family: var(--sans); }
.rd-brand { display: inline-flex; align-items: center; gap: 10px; color: var(--ink); text-decoration: none; font-weight: 700; font-size: 15px; }
.rd-brand span { display: grid; place-items: center; width: 34px; height: 34px; border-radius: 50%; background: var(--mark); color: #1b2a4e; font: 800 13px/1 var(--serif); }
.rd-nav { display: flex; align-items: center; gap: clamp(10px, 2.5vw, 26px); }
.rd-nav a { color: var(--soft); text-decoration: none; font-size: 15px; font-weight: 600; }
.rd-nav a:hover { color: var(--ink); text-decoration: underline; }
.rd-aa { font: 700 15px/1 var(--serif); padding: 8px 12px; border: 1.5px solid var(--line); border-radius: 8px; background: transparent; color: var(--ink); cursor: pointer; }
.rd-panel { position: absolute; right: max(16px, calc((100vw - 1040px) / 2)); top: calc(100% + 8px); display: grid; gap: 10px; padding: 14px; background: var(--bg); border: 1.5px solid var(--line); border-radius: 12px; box-shadow: 0 12px 30px rgba(0, 0, 0, .12); }
.rd-panel[hidden] { display: none; }
.rd-row { display: flex; align-items: center; gap: 8px; }
.rd-row span { width: 44px; font: 600 13px/1 var(--sans); color: var(--muted); }
.rd-row button { font: 600 14px/1 var(--sans); padding: 9px 12px; border: 1.5px solid var(--line); border-radius: 8px; background: transparent; color: var(--ink); cursor: pointer; }
.rd-row button.is-on { background: var(--ink); color: var(--bg); border-color: var(--ink); }

.rd-article { width: min(100% - 32px, 680px); margin: 0 auto; padding: clamp(36px, 7vw, 84px) 0 clamp(40px, 6vw, 72px); }
.rd-head { margin-bottom: 30px; }
.rd-cat { margin: 0 0 14px; font: 600 15px/1.3 var(--sans); color: var(--accent); }
.rd-head h1 { margin: 0; font: 800 clamp(34px, 5.4vw, 54px)/1.1 var(--serif); letter-spacing: -.02em; }
.rd-meta { margin: 16px 0 0; font: 500 15px/1.4 var(--sans); color: var(--muted); }
.rd-lede { margin: 18px 0 0; font: 400 clamp(20px, 2.2vw, 24px)/1.6 var(--serif); color: var(--soft); }
.rd-hero { margin: 0 0 34px; }
.rd-hero img { width: 100%; border-radius: 6px; }

.rd-body { font-size: var(--fs); line-height: 1.78; color: var(--ink); hyphens: auto; overflow-wrap: break-word; }
.rd-body p { margin: 0 0 1.15em; }
.rd-body h2 { margin: 2em 0 .5em; font: 800 1.5em/1.2 var(--serif); letter-spacing: -.015em; }
.rd-body h3 { margin: 1.7em 0 .4em; font: 700 1.25em/1.25 var(--serif); }
.rd-body h4 { margin: 1.5em 0 .3em; font: 700 1.05em/1.3 var(--serif); }
.rd-body ul, .rd-body ol { margin: 0 0 1.2em; padding-left: 1.3em; }
.rd-body li { margin: .35em 0; }
.rd-body blockquote { margin: 1.5em 0; padding: 0 0 0 1.1em; border-left: 4px solid var(--mark); font-style: italic; color: var(--soft); }
.rd-body hr { border: 0; text-align: center; margin: 2em 0; }
.rd-body hr::before { content: '\2766'; color: var(--muted); font-size: 22px; }
.rd-body table { width: 100%; border-collapse: collapse; margin: 1.4em 0; font-size: .85em; }
.rd-body th, .rd-body td { border: 1px solid var(--line); padding: 8px 10px; text-align: left; vertical-align: top; }
.rd-body code, .rd-body pre { font: 500 .85em/1.5 ui-monospace, Menlo, monospace; background: var(--card); border-radius: 4px; padding: .1em .3em; }
.rd-body pre { padding: 14px; overflow-x: auto; }
.rd-end { text-align: center; margin: 40px 0 8px; color: var(--muted); font-size: 24px; }

.rd-by { padding: 18px 0; border-top: 1px solid var(--line); font: 400 16px/1.7 var(--sans); color: var(--soft); }
.rd-cta { margin: 26px 0; padding: 28px clamp(20px, 4vw, 34px); background: var(--card); border: 2px solid var(--ink); border-radius: 14px; box-shadow: 7px 7px 0 -2px var(--accent); }
.rd-cta__k { margin: 0 0 8px; font: 700 13px/1 var(--sans); color: var(--accent); }
.rd-cta h2 { margin: 0 0 8px; font: 800 clamp(24px, 3vw, 32px)/1.15 var(--serif); }
.rd-cta p:not(.rd-cta__k) { margin: 0 0 18px; font: 400 17px/1.6 var(--sans); color: var(--soft); }
.rd-btn { display: inline-block; padding: 14px 26px; border-radius: 999px; background: var(--btn-bg); color: var(--btn-ink); text-decoration: none; font: 700 16px/1.2 var(--sans); }
.rd-btn:hover { filter: brightness(1.12); }

.rd-pn { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin-top: 30px; }
.rd-pn__a { display: block; padding: 14px 16px; border: 1.5px solid var(--line); border-radius: 10px; text-decoration: none; color: var(--ink); font: 700 16px/1.35 var(--serif); }
.rd-pn__a small { display: block; margin-bottom: 4px; font: 600 12px/1 var(--sans); color: var(--muted); }
.rd-pn__a--r { text-align: right; }
.rd-pn__a:hover { border-color: var(--accent); }

.rd-year { margin: 2.2em 0 .6em; font: 800 28px/1 var(--serif); color: var(--accent); }
.rd-list { list-style: none; margin: 0; padding: 0; }
.rd-list li { border-top: 1px solid var(--line); }
.rd-list a { display: block; padding: 18px 0; text-decoration: none; color: var(--ink); }
.rd-list__t { display: block; font: 700 clamp(20px, 2.4vw, 24px)/1.25 var(--serif); }
.rd-list a:hover .rd-list__t { color: var(--accent); text-decoration: underline; }
.rd-list__d { display: block; margin-top: 6px; font: 400 16px/1.55 var(--sans); color: var(--soft); }
.rd-list__m { display: block; margin-top: 6px; font: 500 13px/1 var(--sans); color: var(--muted); }

.rd-foot { padding: 30px 16px 60px; border-top: 1px solid var(--line); text-align: center; font: 400 14px/1.9 var(--sans); color: var(--muted); }
.rd-foot a { color: var(--soft); }

@media (max-width: 560px) { .rd-nav a:nth-child(2) { display: none; } .rd-pn { grid-template-columns: 1fr; } .rd-pn__a--r { text-align: left; } }
@media print { .rd-top, .rd-progress, .rd-cta, .rd-pn, .rd-foot { display: none; } body { background: #fff; color: #000; } }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

.rd-more { margin: 30px 0 10px; }
.rd-more h2 { margin: 0 0 8px; font: 800 24px/1.2 var(--serif); }
.rd-more ul { list-style: none; margin: 0; padding: 0; }
.rd-more li { border-top: 1px solid var(--line); }
.rd-more a { display: block; padding: 14px 0 2px; font: 700 19px/1.35 var(--serif); color: var(--ink); text-decoration: none; }
.rd-more a:hover { color: var(--accent); text-decoration: underline; }
.rd-more small { display: block; padding-bottom: 12px; font: 500 13px/1 var(--sans); color: var(--muted); }