/* ============================================================ MitiruEngine — minimal theme stylesheet Single sheet. No build step, no preprocessor. Color tokens drive light/dark modes. Manual toggle wins over OS. ============================================================ */ :root { /* ----- color tokens (light, default) ----- */ --c-bg: #ffffff; --c-bg-alt: #f6f7f9; --c-bg-elev: #ffffff; --c-bg-code: #f3f5f9; --c-bg-hero-top: #fafbfc; --c-bg-header: rgba(255, 255, 255, 0.92); --c-fg: #1c2330; --c-fg-soft: #5a6675; --c-fg-mute: #8c95a3; --c-fg-invert: #ffffff; --c-accent: #2563eb; --c-accent-hover: #1d4ed8; --c-accent-grad-2: #0ea5e9; --c-accent-soft: #dbeafe; --c-accent-on-soft: #1d4ed8; --c-border: #e4e8ee; --c-rule: #eef1f5; --c-shadow: 0 1px 2px rgba(20, 25, 35, 0.05); --c-shadow-hover: 0 8px 24px rgba(20, 25, 35, 0.06); --c-shadow-card: 0 10px 24px rgba(20, 25, 35, 0.08); --c-shadow-soft: 0 6px 18px rgba(20, 25, 35, 0.05); /* code-block syntax tokens (light theme defaults — dark theme overrides below) */ --c-code-fg: #1a2030; --c-code-comment: #8b949e; --c-code-kw: #ff7b72; --c-code-fn: #d2a8ff; --c-code-str: #a5d6ff; --c-code-pp: #79c0ff; /* badge — example kinds */ --c-badge-overlay: rgba(15, 22, 35, 0.78); --c-badge-cef: #2563eb; --c-badge-headless: #475569; --c-badge-headless-soft: #f1f5f9; --c-badge-headless-on: #475569; /* badge — ADR statuses */ --c-adr-accepted-bg: #d1fae5; --c-adr-accepted-fg: #065f46; --c-adr-accepted-bd: #a7f3d0; --c-adr-proposed-bg: #fef3c7; --c-adr-proposed-fg: #92400e; --c-adr-proposed-bd: #fde68a; --c-adr-rejected-bg: #fee2e2; --c-adr-rejected-fg: #991b1b; --c-adr-rejected-bd: #fecaca; --c-adr-superseded-bg: #e0e7ff; --c-adr-superseded-fg: #3730a3; --c-adr-superseded-bd: #c7d2fe; --c-adr-deprecated-bg: #f3f4f6; --c-adr-deprecated-fg: #4b5563; --c-adr-deprecated-bd: #d1d5db; /* footer (kept dark in both themes — it is intentional accent) */ --c-footer-bg: #0f1623; --c-footer-fg: #c7cfdb; --c-footer-fg-strong: #ffffff; --c-footer-fg-mute: #8893a4; --c-footer-link: #9fc3ff; /* ----- shape & layout ----- */ --r-max-width: 1140px; --r-pad: 1.5rem; --r-radius: 8px; --r-radius-lg: 12px; --r-tap: 44px; /* ----- typography (Siv3D / ebiten 風: system font 優先で軽く・読みやすく) ----- */ --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Kaku Gothic ProN", "Hiragino Sans", "Yu Gothic", "Noto Sans JP", Roboto, "Inter", system-ui, sans-serif; --font-mono: "JetBrains Mono", "SF Mono", "Cascadia Mono", Menlo, Consolas, ui-monospace, monospace; --font-jp: -apple-system, "Hiragino Kaku Gothic ProN", "Hiragino Sans", "Yu Gothic", "Noto Sans JP", "Segoe UI", sans-serif; } /* ----- dark mode: auto-follow OS, unless [data-theme] is set on ----- */ @media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) { --c-bg: #0f1419; --c-bg-alt: #161c24; --c-bg-elev: #1a2230; --c-bg-code: #0a0f17; --c-code-fg: #e6edf3; --c-bg-hero-top: #11171f; --c-bg-header: rgba(15, 20, 25, 0.85); --c-fg: #e6ecf2; --c-fg-soft: #b3bdc9; --c-fg-mute: #7d8593; --c-fg-invert: #0f1419; --c-accent: #60a5fa; --c-accent-hover: #93c5fd; --c-accent-grad-2: #38bdf8; --c-accent-soft: #1e3a5f; --c-accent-on-soft: #bfdbfe; --c-border: #2a323d; --c-rule: #1e252e; --c-shadow: 0 1px 2px rgba(0, 0, 0, 0.35); --c-shadow-hover: 0 8px 24px rgba(0, 0, 0, 0.4); --c-shadow-card: 0 10px 24px rgba(0, 0, 0, 0.5); --c-shadow-soft: 0 6px 18px rgba(0, 0, 0, 0.35); --c-badge-overlay: rgba(0, 0, 0, 0.7); --c-badge-cef: #3b82f6; --c-badge-headless: #64748b; --c-badge-headless-soft: #1e252e; --c-badge-headless-on: #b3bdc9; --c-adr-accepted-bg: #064e3b; --c-adr-accepted-fg: #a7f3d0; --c-adr-accepted-bd: #065f46; --c-adr-proposed-bg: #5a3a00; --c-adr-proposed-fg: #fde68a; --c-adr-proposed-bd: #92400e; --c-adr-rejected-bg: #5b1e1e; --c-adr-rejected-fg: #fecaca; --c-adr-rejected-bd: #991b1b; --c-adr-superseded-bg: #1e1b4b; --c-adr-superseded-fg: #c7d2fe; --c-adr-superseded-bd: #3730a3; --c-adr-deprecated-bg: #1f242c; --c-adr-deprecated-fg: #c5cbd4; --c-adr-deprecated-bd: #3a424d; } } /* ----- dark mode: explicit manual override ----- */ :root[data-theme="dark"] { --c-bg: #0f1419; --c-bg-alt: #161c24; --c-code-fg: #e6edf3; --c-bg-elev: #1a2230; --c-bg-code: #0a0f17; --c-bg-hero-top: #11171f; --c-bg-header: rgba(15, 20, 25, 0.85); --c-fg: #e6ecf2; --c-fg-soft: #b3bdc9; --c-fg-mute: #7d8593; --c-fg-invert: #0f1419; --c-accent: #60a5fa; --c-accent-hover: #93c5fd; --c-accent-grad-2: #38bdf8; --c-accent-soft: #1e3a5f; --c-accent-on-soft: #bfdbfe; --c-border: #2a323d; --c-rule: #1e252e; --c-shadow: 0 1px 2px rgba(0, 0, 0, 0.35); --c-shadow-hover: 0 8px 24px rgba(0, 0, 0, 0.4); --c-shadow-card: 0 10px 24px rgba(0, 0, 0, 0.5); --c-shadow-soft: 0 6px 18px rgba(0, 0, 0, 0.35); --c-badge-overlay: rgba(0, 0, 0, 0.7); --c-badge-cef: #3b82f6; --c-badge-headless: #64748b; --c-badge-headless-soft: #1e252e; --c-badge-headless-on: #b3bdc9; --c-adr-accepted-bg: #064e3b; --c-adr-accepted-fg: #a7f3d0; --c-adr-accepted-bd: #065f46; --c-adr-proposed-bg: #5a3a00; --c-adr-proposed-fg: #fde68a; --c-adr-proposed-bd: #92400e; --c-adr-rejected-bg: #5b1e1e; --c-adr-rejected-fg: #fecaca; --c-adr-rejected-bd: #991b1b; --c-adr-superseded-bg: #1e1b4b; --c-adr-superseded-fg: #c7d2fe; --c-adr-superseded-bd: #3730a3; --c-adr-deprecated-bg: #1f242c; --c-adr-deprecated-fg: #c5cbd4; --c-adr-deprecated-bd: #3a424d; } /* :root[data-theme="light"] explicitly re-asserts light values so it always overrides the OS @media block above. Values mirror the defaults in :root. */ :root[data-theme="light"] { --c-bg: #ffffff; --c-bg-alt: #f6f7f9; --c-bg-elev: #ffffff; --c-bg-code: #f3f5f9; --c-code-fg: #1a2030; --c-bg-hero-top: #fafbfc; --c-bg-header: rgba(255, 255, 255, 0.92); --c-fg: #1c2330; --c-fg-soft: #5a6675; --c-fg-mute: #8c95a3; --c-fg-invert: #ffffff; --c-accent: #2563eb; --c-accent-hover: #1d4ed8; --c-accent-grad-2: #0ea5e9; --c-accent-soft: #dbeafe; --c-accent-on-soft: #1d4ed8; --c-border: #e4e8ee; --c-rule: #eef1f5; --c-shadow: 0 1px 2px rgba(20, 25, 35, 0.05); --c-shadow-hover: 0 8px 24px rgba(20, 25, 35, 0.06); --c-shadow-card: 0 10px 24px rgba(20, 25, 35, 0.08); --c-shadow-soft: 0 6px 18px rgba(20, 25, 35, 0.05); --c-badge-overlay: rgba(15, 22, 35, 0.78); --c-badge-cef: #2563eb; --c-badge-headless: #475569; --c-badge-headless-soft: #f1f5f9; --c-badge-headless-on: #475569; --c-adr-accepted-bg: #d1fae5; --c-adr-accepted-fg: #065f46; --c-adr-accepted-bd: #a7f3d0; --c-adr-proposed-bg: #fef3c7; --c-adr-proposed-fg: #92400e; --c-adr-proposed-bd: #fde68a; --c-adr-rejected-bg: #fee2e2; --c-adr-rejected-fg: #991b1b; --c-adr-rejected-bd: #fecaca; --c-adr-superseded-bg: #e0e7ff; --c-adr-superseded-fg: #3730a3; --c-adr-superseded-bd: #c7d2fe; --c-adr-deprecated-bg: #f3f4f6; --c-adr-deprecated-fg: #4b5563; --c-adr-deprecated-bd: #d1d5db; } * { box-sizing: border-box; } html { scroll-behavior: smooth; } body { margin: 0; font-family: var(--font-sans); color: var(--c-fg); background: var(--c-bg); line-height: 1.65; -webkit-font-smoothing: antialiased; text-rendering: optimizeLegibility; } html[lang="ja"] body { font-family: var(--font-jp); line-height: 1.8; font-feature-settings: "palt" 1; } html[lang="ja"] .page-article__body, html[lang="ja"] .chapter-article__body, html[lang="ja"] .example-detail__body, html[lang="ja"] .api-page__content, html[lang="ja"] .adr-page__article { line-break: strict; } a { color: var(--c-accent); text-decoration: none; } a:hover { text-decoration: underline; } code, pre, kbd, samp { font-family: var(--font-mono); } .container { max-width: var(--r-max-width); margin: 0 auto; padding-left: var(--r-pad); padding-right: var(--r-pad); } .visually-hidden { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; } /* ----- header ----- */ .site-header { border-bottom: 1px solid var(--c-rule); position: sticky; top: 0; background: var(--c-bg-header); backdrop-filter: saturate(180%) blur(8px); z-index: 10; } .site-header__inner { display: flex; align-items: center; justify-content: space-between; height: 64px; gap: 0.5rem; } .site-header__brand { display: flex; align-items: center; gap: 0.55rem; color: var(--c-fg); font-weight: 700; } .site-header__brand:hover { text-decoration: none; color: var(--c-accent); } .site-header__brand-mark { display: inline-flex; align-items: center; justify-content: center; width: 28px; height: 28px; border-radius: 6px; background: linear-gradient(135deg, var(--c-accent) 0%, var(--c-accent-grad-2) 100%); color: var(--c-fg-invert); font-weight: 800; font-size: 0.95rem; } .site-nav { display: flex; align-items: center; gap: 1.5rem; font-size: 0.93rem; } .site-nav a { color: var(--c-fg-soft); white-space: nowrap; } .site-nav a:hover { color: var(--c-accent); text-decoration: none; } .site-nav__github { display: inline-flex; } .site-nav__lang { color: var(--c-fg-mute); font-size: 0.85rem; } .site-nav__lang a { color: var(--c-fg-mute); margin-left: 0.3rem; } .site-nav__lang strong { color: var(--c-fg); margin-left: 0.3rem; } /* ----- theme toggle button ----- */ .theme-toggle { display: inline-flex; align-items: center; justify-content: center; width: 36px; height: 36px; padding: 0; border: 1px solid var(--c-border); border-radius: var(--r-radius); background: transparent; color: var(--c-fg-soft); cursor: pointer; transition: color 120ms ease, border-color 120ms ease, background 120ms ease; } .theme-toggle:hover { color: var(--c-accent); border-color: var(--c-accent); } .theme-toggle:focus-visible { outline: 2px solid var(--c-accent); outline-offset: 2px; } .theme-toggle svg { display: block; width: 18px; height: 18px; } /* default: show moon (light theme is active, click to go dark) */ .theme-toggle .theme-toggle__icon--sun { display: none; } .theme-toggle .theme-toggle__icon--moon { display: block; } :root[data-theme="dark"] .theme-toggle .theme-toggle__icon--sun { display: block; } :root[data-theme="dark"] .theme-toggle .theme-toggle__icon--moon { display: none; } @media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) .theme-toggle .theme-toggle__icon--sun { display: block; } :root:not([data-theme="light"]) .theme-toggle .theme-toggle__icon--moon { display: none; } } /* ----- hamburger nav toggle (mobile) ----- The checkbox is the source of truth for nav open/close state — CSS-only, works without JavaScript. The