/* ========================================================================== MATH 4210 simulation engine -- shared stylesheet Loaded by every book-myst/sims/chNN-.html via a sibling relative . Same folder, same origin, ZERO external requests. Palette is the book palette (see _planning/08-site-design.md). Theme resolution order, handled by _engine.js: 1. prefers-color-scheme (the no-JS / standalone default) 2. .sim-light / .sim-dark class on (the class hook) The engine sets the class hook by mirroring the parent book page's html.dark class, so a sim follows the book's own theme toggle. ========================================================================== */ :root { --sim-bg: #ffffff; --sim-surface: #f5f5f7; --sim-text: #111113; --sim-text-2: #2b2b2e; --sim-hairline: #d2d2d7; --sim-accent: #0b5fcc; /* Accent 1: interactive */ --sim-accent-2: #8a5300; /* Accent 2: emphasis */ --sim-accent-contrast: #ffffff; --sim-grid: #e6e6ea; --sim-radius: 12px; --sim-tap: 44px; /* minimum touch target */ --sim-font: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Inter, Roboto, "Helvetica Neue", Arial, sans-serif; --sim-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace; } /* Dark: media-query default ... */ @media (prefers-color-scheme: dark) { :root:not(.sim-light) { --sim-bg: #0b0b0c; --sim-surface: #161618; --sim-text: #f7f7f8; --sim-text-2: #d5d5d9; --sim-hairline: #3a3a3d; --sim-accent: #4c9dff; --sim-accent-2: #e8b04b; --sim-accent-contrast: #0b0b0c; --sim-grid: #2a2a2d; } } /* ... and the class hook, which must win in BOTH directions. */ :root.sim-dark { --sim-bg: #0b0b0c; --sim-surface: #161618; --sim-text: #f7f7f8; --sim-text-2: #d5d5d9; --sim-hairline: #3a3a3d; --sim-accent: #4c9dff; --sim-accent-2: #e8b04b; --sim-accent-contrast: #0b0b0c; --sim-grid: #2a2a2d; } :root.sim-light { --sim-bg: #ffffff; --sim-surface: #f5f5f7; --sim-text: #111113; --sim-text-2: #2b2b2e; --sim-hairline: #d2d2d7; --sim-accent: #0b5fcc; --sim-accent-2: #8a5300; --sim-accent-contrast: #ffffff; --sim-grid: #e6e6ea; } * { box-sizing: border-box; } html, body { margin: 0; padding: 0; background: var(--sim-bg); color: var(--sim-text); font-family: var(--sim-font); font-size: 16px; line-height: 1.5; -webkit-text-size-adjust: 100%; overflow-x: hidden; /* a sim never scrolls sideways */ } body { padding: 12px; touch-action: manipulation; } /* ---------- shell ---------------------------------------------------- */ .sim-root { max-width: 860px; margin: 0 auto; border: 1px solid var(--sim-hairline); border-radius: var(--sim-radius); background: var(--sim-bg); padding: 14px; } .sim-title { margin: 0 0 10px; font-size: 1.0625rem; font-weight: 600; letter-spacing: -0.01em; color: var(--sim-text); } /* ---------- plot ------------------------------------------------------ */ .sim-plot-wrap { position: relative; width: 100%; background: var(--sim-surface); border: 1px solid var(--sim-hairline); border-radius: 10px; overflow: hidden; } .sim-plot-wrap + .sim-plot-wrap { margin-top: 10px; } canvas.sim-canvas { display: block; width: 100%; height: auto; touch-action: none; /* required: we own the drag gesture */ } canvas.sim-canvas:focus-visible { outline: 3px solid var(--sim-accent); outline-offset: -3px; } /* ---------- readouts -------------------------------------------------- */ .sim-readouts { display: grid; grid-template-columns: repeat(auto-fit, minmax(96px, 1fr)); gap: 8px; margin-top: 10px; } .sim-stat { background: var(--sim-surface); border: 1px solid var(--sim-hairline); border-radius: 10px; padding: 8px 10px; min-width: 0; } .sim-stat-label { display: block; font-size: 0.75rem; font-weight: 500; color: var(--sim-text-2); letter-spacing: 0.01em; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; } .sim-stat-value { display: block; margin-top: 2px; font-family: var(--sim-mono); font-size: 1rem; font-weight: 600; color: var(--sim-text); font-variant-numeric: tabular-nums; } .sim-stat.is-accent .sim-stat-value { color: var(--sim-accent); } .sim-stat.is-accent-2 .sim-stat-value { color: var(--sim-accent-2); } /* ---------- sliders --------------------------------------------------- */ .sim-controls { margin-top: 12px; display: grid; gap: 4px; } .sim-slider-row { display: grid; grid-template-columns: 1fr auto; align-items: center; gap: 4px 10px; min-height: var(--sim-tap); padding: 2px 0; } .sim-slider-label { font-size: 0.875rem; font-weight: 500; color: var(--sim-text-2); min-width: 0; } .sim-slider-value { font-family: var(--sim-mono); font-size: 0.875rem; font-weight: 600; color: var(--sim-accent); font-variant-numeric: tabular-nums; text-align: right; min-width: 4.5ch; } .sim-slider-row input[type="range"] { grid-column: 1 / -1; width: 100%; height: var(--sim-tap); /* 44px hit area, thin visible track */ margin: 0; background: transparent; -webkit-appearance: none; appearance: none; cursor: pointer; } .sim-slider-row input[type="range"]::-webkit-slider-runnable-track { height: 6px; border-radius: 3px; background: var(--sim-hairline); } .sim-slider-row input[type="range"]::-moz-range-track { height: 6px; border-radius: 3px; background: var(--sim-hairline); } .sim-slider-row input[type="range"]::-webkit-slider-thumb { -webkit-appearance: none; appearance: none; width: 26px; height: 26px; margin-top: -10px; border-radius: 50%; background: var(--sim-accent); border: 2px solid var(--sim-bg); box-shadow: 0 1px 3px rgba(0, 0, 0, 0.28); } .sim-slider-row input[type="range"]::-moz-range-thumb { width: 26px; height: 26px; border-radius: 50%; border: 2px solid var(--sim-bg); background: var(--sim-accent); box-shadow: 0 1px 3px rgba(0, 0, 0, 0.28); } /* Focus is NEVER hidden. */ .sim-slider-row input[type="range"]:focus-visible::-webkit-slider-thumb { outline: 3px solid var(--sim-accent); outline-offset: 2px; } .sim-slider-row input[type="range"]:focus-visible::-moz-range-thumb { outline: 3px solid var(--sim-accent); outline-offset: 2px; } /* ---------- buttons --------------------------------------------------- */ .sim-buttons { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 12px; } .sim-btn { flex: 1 1 auto; min-width: 96px; min-height: var(--sim-tap); padding: 10px 16px; border-radius: 10px; border: 1px solid var(--sim-accent); background: var(--sim-accent); color: var(--sim-accent-contrast); font-family: inherit; font-size: 0.9375rem; font-weight: 600; cursor: pointer; -webkit-tap-highlight-color: transparent; } .sim-btn.is-secondary { background: transparent; color: var(--sim-accent); } .sim-btn:focus-visible { outline: 3px solid var(--sim-accent); outline-offset: 2px; } .sim-btn[disabled] { opacity: 0.45; cursor: default; } /* ---------- caption / explainer -------------------------------------- */ .sim-caption { margin-top: 12px; padding-top: 10px; border-top: 1px solid var(--sim-hairline); font-size: 0.875rem; line-height: 1.55; color: var(--sim-text-2); } .sim-caption strong { color: var(--sim-text); font-weight: 600; } .sim-caption p { margin: 0 0 6px; } .sim-caption p:last-child { margin-bottom: 0; } /* Screen-reader-only live region: the readouts are announced to AT. */ .sim-sr { position: absolute; width: 1px; height: 1px; margin: -1px; padding: 0; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0; } /* ---------- responsive ------------------------------------------------ */ /* Phones: 320px must stay readable and never scroll sideways. */ @media (max-width: 430px) { body { padding: 8px; } .sim-root { padding: 10px; border-radius: 10px; } .sim-title { font-size: 1rem; } .sim-readouts { grid-template-columns: repeat(auto-fit, minmax(78px, 1fr)); gap: 6px; } .sim-stat { padding: 6px 8px; } .sim-stat-value { font-size: 0.9375rem; } .sim-btn { min-width: 0; flex: 1 1 45%; padding: 10px 8px; font-size: 0.875rem; } } @media (max-width: 340px) { .sim-readouts { grid-template-columns: repeat(2, 1fr); } .sim-btn { flex: 1 1 100%; } } @media (prefers-reduced-motion: reduce) { * { transition: none !important; animation: none !important; } }