/* SPDX-FileCopyrightText: 2026 Edward Kmett
 * SPDX-License-Identifier: UPL-1.0 AND BSD-3-Clause */
:root {
  color-scheme: light;
  --thc-ink: #263129;
  --thc-muted: #626d62;
  --thc-link: #3157ac;
  --thc-accent: #5d793f;
  --thc-heading: #34462d;
  --thc-paper: #fff;
  --thc-pale: #f4f6f2;
  --thc-line: #dde2d8;
  --thc-code: #f5f7f9;
  --thc-inline-code: #eef2f4;
  --thc-wash: #eef4e8;
  --thc-serif: Georgia, "Times New Roman", serif;
  --thc-mono: ui-monospace, "SFMono-Regular", Consolas, monospace;
}
:root[data-thc-theme="dark"] {
  color-scheme: dark;
  --thc-ink: #e0e5dc;
  --thc-muted: #a5b0a1;
  --thc-link: #a6bcff;
  --thc-accent: #a2bb7b;
  --thc-heading: #c8d8b7;
  --thc-paper: #191e1a;
  --thc-pale: #232a24;
  --thc-line: #364034;
  --thc-code: #202825;
  --thc-inline-code: #29322c;
  --thc-wash: #303d2c;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-thc-theme="light"]) {
    color-scheme: dark;
    --thc-ink: #e0e5dc; --thc-muted: #a5b0a1; --thc-link: #a6bcff;
    --thc-accent: #a2bb7b; --thc-heading: #c8d8b7; --thc-paper: #191e1a;
    --thc-pale: #232a24; --thc-line: #364034; --thc-code: #202825;
    --thc-inline-code: #29322c; --thc-wash: #303d2c;
  }
}
* { box-sizing: border-box; }
.thc-shell { margin: 0; background: var(--thc-paper); color: var(--thc-ink); font: 15px/1.5 system-ui, sans-serif; }
.thc-shell-layout { display: grid; grid-template-columns: 252px minmax(0, 1fr); height: 100dvh; min-height: 360px; }
.thc-rail { display: flex; flex-direction: column; min-width: 0; overflow-y: auto; border-right: 1px solid var(--thc-line); background: var(--thc-pale); padding: 26px 18px 20px; }
.thc-brand { display: block; padding: 0 12px 28px; color: var(--thc-heading); font: 1.875rem/1.2 var(--thc-serif); letter-spacing: -.7px; text-decoration: none; white-space: nowrap; }
.thc-brand span { color: var(--thc-muted); font-size: 16px; font-weight: 400; letter-spacing: 0; }
.thc-rail nav { flex: 1; }
.thc-nav-label { margin: 22px 12px 8px; color: var(--thc-muted); font-size: 10px; font-weight: 700; letter-spacing: .11em; text-transform: uppercase; }
.thc-nav-link { display: block; border-radius: 6px; margin: 1px 0; padding: 7px 12px; color: var(--thc-ink); text-decoration: none; }
.thc-nav-link:hover, .thc-nav-link:focus-visible { background: var(--thc-wash); color: var(--thc-heading); }
.thc-nav-link[aria-current="page"] { background: var(--thc-wash); color: var(--thc-heading); font-weight: 700; }
.thc-appearance { min-width: 0; margin: 0 0 12px; padding: 0 10px; border: 0; }
.thc-appearance legend { margin-bottom: 8px; padding: 0; color: var(--thc-muted); font-size: 11px; }
.thc-theme-options { display: flex; padding: 3px; border: 1px solid var(--thc-line); border-radius: 7px; background: var(--thc-paper); }
.thc-theme-options button { flex: 1; min-width: 0; border: 0; border-radius: 4px; padding: 8px 5px; background: transparent; color: var(--thc-muted); font: 600 11px/1.3 system-ui, sans-serif; white-space: nowrap; cursor: pointer; }
.thc-theme-options button:hover { color: var(--thc-heading); }
.thc-theme-options button[aria-pressed="true"] { background: var(--thc-wash); color: var(--thc-heading); }
.thc-rail-footer { border-top: 1px solid var(--thc-line); padding: 16px 12px 0; color: var(--thc-muted); font-size: 11px; }
.thc-rail-footer p { margin: 0 0 8px; }
.thc-rail-footer a { color: var(--thc-link); }
#thc-content { width: 100%; height: 100%; border: 0; background: var(--thc-paper); }
.thc-menu { display: none; }
.thc-shell a:focus-visible, .thc-shell button:focus-visible { outline: 2px solid var(--thc-accent); outline-offset: 2px; }

/* Documents remain useful when opened at their direct, shareable URLs. */
.thc-guide { margin: 0; padding: 48px clamp(20px, 6vw, 88px) 80px; background: var(--thc-paper); color: var(--thc-ink); font: 1.1875rem/1.75 var(--thc-serif); }
.thc-prose { max-width: 808px; min-width: 0; margin: 0 auto; }
.thc-prose h1, .thc-prose h2, .thc-prose h3 { font-family: var(--thc-serif); font-weight: 400; line-height: 1.2; color: var(--thc-heading); }
.thc-prose h1 { font-size: clamp(2.375rem, 5vw, 3.5625rem); line-height: 1.13; letter-spacing: -1.5px; margin: 0 0 28px; max-width: 760px; }
.thc-prose h2 { font-size: 1.875rem; line-height: 1.25; margin: 48px 0 18px; }
.thc-prose h3 { font-size: 20px; margin-top: 32px; }
.thc-prose p { margin: 18px 0; }
.thc-prose a { color: var(--thc-link); text-underline-offset: 3px; }
.thc-prose li { margin: 8px 0; }
.thc-prose pre { padding: 21px 24px; overflow: auto; border: 1px solid var(--thc-line); border-radius: 4px; background: var(--thc-code); font: .9375rem/1.7 var(--thc-mono); }
.thc-prose code { font-family: var(--thc-mono); font-size: .78em; }
.thc-prose pre code { font: inherit; }
.thc-prose :not(pre) > code { background: var(--thc-inline-code); padding: 2px 4px; border-radius: 3px; }
.thc-prose table { display: block; overflow-x: auto; border-collapse: collapse; width: 100%; font-size: 14px; }
.thc-prose th, .thc-prose td { border-bottom: 1px solid var(--thc-line); padding: 12px 16px; text-align: left; }
.thc-prose th { background: var(--thc-pale); }
.thc-prose blockquote { border-left: 2px solid var(--thc-link); margin-left: 0; padding-left: 24px; color: var(--thc-muted); font-style: italic; }
.thc-prose img { max-width: 100%; height: auto; }
.thc-prose .thc-eyebrow { text-transform: uppercase; letter-spacing: .12em; color: var(--thc-accent); font: 600 11px/1.5 system-ui, sans-serif; margin: 0 0 18px; }
.thc-footer { border-top: 1px solid var(--thc-line); margin-top: 64px; padding-top: 20px; font-size: 12px; color: var(--thc-muted); }
.thc-guide a:focus-visible { outline: 2px solid var(--thc-accent); outline-offset: 4px; }

@media (max-width: 800px) {
  .thc-shell-layout { display: block; height: calc(100dvh - 48px); }
  .thc-menu { display: block; width: 100%; height: 48px; border: 0; border-bottom: 1px solid var(--thc-line); padding: 0 20px; background: var(--thc-pale); color: var(--thc-ink); text-align: left; font: 700 14px system-ui, sans-serif; }
  .thc-rail { position: absolute; z-index: 5; top: 48px; left: 0; width: min(290px, 85vw); height: calc(100dvh - 48px); box-shadow: 10px 10px 30px #102c2424; display: none; }
  .thc-rail.thc-open { display: flex; }
  #thc-content { height: 100%; }
  .thc-guide { padding: 30px 20px 60px; }
}
@media print { .thc-rail, .thc-menu { display: none; } .thc-shell-layout { display: block; } #thc-content { width: 100%; } }