/* ─────────────────────────── tokens ─────────────────────────── The viewer has three theme states, not two: an explicit data-theme on , or no stamp at all, where only prefers-color-scheme applies. So the palette is defined three times. Never give a colour its only definition inside a media or [data-theme] block. */ :root { --bg: #f7f8fa; --surface: #ffffff; --surface-2: #eef1f6; --text: #16191f; --muted: #5c6472; --border: #dde2ea; --accent: #326ce5; --accent-fg: #ffffff; --accent-dim: #e7eefc; --correct: #16794a; --correct-bg: #e3f5eb; --wrong: #b3261e; --wrong-bg: #fbe8e7; --code-bg: #f2f4f8; --shadow: 0 1px 2px rgba(16, 24, 40, .06), 0 8px 24px rgba(16, 24, 40, .06); --radius: 12px; --measure: 46rem; --sans: ui-sans-serif, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif; --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace; } @media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) { --bg: #0e1117; --surface: #161b24; --surface-2: #1d2430; --text: #e6e9ef; --muted: #99a1b0; --border: #29313f; --accent: #6ea8ff; --accent-fg: #0e1117; --accent-dim: #1b2740; --correct: #63d19b; --correct-bg: #122c20; --wrong: #ff8c82; --wrong-bg: #331a19; --code-bg: #11161f; --shadow: 0 1px 2px rgba(0, 0, 0, .4), 0 8px 24px rgba(0, 0, 0, .3); } } :root[data-theme="dark"] { --bg: #0e1117; --surface: #161b24; --surface-2: #1d2430; --text: #e6e9ef; --muted: #99a1b0; --border: #29313f; --accent: #6ea8ff; --accent-fg: #0e1117; --accent-dim: #1b2740; --correct: #63d19b; --correct-bg: #122c20; --wrong: #ff8c82; --wrong-bg: #331a19; --code-bg: #11161f; --shadow: 0 1px 2px rgba(0, 0, 0, .4), 0 8px 24px rgba(0, 0, 0, .3); } /* ─────────────────────────── base ─────────────────────────── */ *, *::before, *::after { box-sizing: border-box; } /* Any element given its own display rule would otherwise ignore [hidden]. */ [hidden] { display: none !important; } html { -webkit-text-size-adjust: 100%; } body { margin: 0; padding: 0 1.25rem 4rem; background: var(--bg); color: var(--text); font: 16px/1.6 var(--sans); transition: background .2s ease, color .2s ease; } main { max-width: var(--measure); margin: 0 auto; } h1 { font-size: clamp(1.9rem, 5vw, 2.75rem); line-height: 1.15; letter-spacing: -.02em; margin: .2em 0 .5em; } h2 { font-size: clamp(1.2rem, 3vw, 1.5rem); line-height: 1.35; letter-spacing: -.01em; margin: .2em 0 1.2em; } h3 { font-size: 1rem; letter-spacing: .04em; text-transform: uppercase; color: var(--muted); margin: 2.5rem 0 .9rem; } code { font-family: var(--mono); font-size: .9em; background: var(--code-bg); padding: .12em .38em; border-radius: 5px; } a { color: var(--accent); text-underline-offset: 2px; } kbd { font-family: var(--mono); font-size: .82em; background: var(--surface); border: 1px solid var(--border); border-bottom-width: 2px; border-radius: 5px; padding: .1em .4em; } .lede { font-size: 1.075rem; color: var(--muted); max-width: 40rem; } .meta { font-size: .8rem; letter-spacing: .06em; text-transform: uppercase; color: var(--muted); display: flex; gap: .75rem; align-items: center; } .hint { font-size: .875rem; color: var(--muted); } /* ─────────────────────────── chrome ─────────────────────────── */ .topbar { max-width: var(--measure); margin: 0 auto; display: flex; align-items: center; justify-content: space-between; padding: 1.25rem 0 2.5rem; } .brand { font-weight: 650; letter-spacing: -.01em; } .brand-mark { color: var(--accent); margin-right: .3rem; } footer { max-width: var(--measure); margin: 5rem auto 0; border-top: 1px solid var(--border); padding-top: 1.25rem; font-size: .85rem; color: var(--muted); } button { font: inherit; cursor: pointer; } .primary { background: var(--accent); color: var(--accent-fg); border: 0; border-radius: var(--radius); padding: .7rem 1.35rem; font-weight: 600; transition: filter .15s ease, transform .05s ease; } .primary:hover { filter: brightness(1.08); } .primary:active { transform: translateY(1px); } .ghost { background: transparent; color: var(--muted); border: 1px solid var(--border); border-radius: 999px; padding: .35rem .85rem; font-size: .85rem; } .ghost:hover { color: var(--text); border-color: var(--accent); } :focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; } /* ─────────────────────────── intro ─────────────────────────── */ .domain-legend { list-style: none; padding: 0; margin: 2rem 0; display: grid; gap: .5rem; } .domain-legend li { display: flex; justify-content: space-between; gap: 1rem; border-bottom: 1px solid var(--border); padding-bottom: .5rem; font-size: .95rem; } .domain-legend .weight { color: var(--muted); font-variant-numeric: tabular-nums; } /* ─────────────────────────── quiz ─────────────────────────── */ .progress { display: flex; gap: 5px; margin-bottom: 2.25rem; } .progress span { flex: 1; height: 4px; border-radius: 2px; background: var(--border); transition: background .2s ease; } .progress span.correct { background: var(--correct); } .progress span.wrong { background: var(--wrong); } .progress span.current { background: var(--accent); } .domain-tag { background: var(--accent-dim); color: var(--accent); border-radius: 999px; padding: .15rem .6rem; letter-spacing: .04em; font-size: .72rem; } .snippet { background: var(--code-bg); border: 1px solid var(--border); border-radius: var(--radius); padding: 1rem 1.1rem; margin: 0 0 1.5rem; font-family: var(--mono); font-size: .85rem; line-height: 1.55; overflow-x: auto; } .options { list-style: none; padding: 0; margin: 0; display: grid; gap: .65rem; } .opt { width: 100%; text-align: left; display: flex; gap: .85rem; align-items: flex-start; background: var(--surface); color: var(--text); border: 1px solid var(--border); border-radius: var(--radius); padding: .9rem 1rem; box-shadow: var(--shadow); transition: border-color .15s ease, background .15s ease; } .opt:hover:not(:disabled) { border-color: var(--accent); } .opt:disabled { cursor: default; } .opt .letter { flex: 0 0 1.6rem; height: 1.6rem; display: grid; place-items: center; border: 1px solid var(--border); border-radius: 7px; font-family: var(--mono); font-size: .78rem; color: var(--muted); } .opt.correct { border-color: var(--correct); background: var(--correct-bg); } .opt.correct .letter { border-color: var(--correct); color: var(--correct); } .opt.wrong { border-color: var(--wrong); background: var(--wrong-bg); } .opt.wrong .letter { border-color: var(--wrong); color: var(--wrong); } .explain { margin-top: 1.75rem; padding: 1.25rem 1.35rem; background: var(--surface-2); border-radius: var(--radius); border-left: 3px solid var(--accent); } .explain p { margin: 0 0 .85rem; } .explain > :last-child { margin-bottom: 0; } .verdict-line { font-weight: 650; } .verdict-line.correct { color: var(--correct); } .verdict-line.wrong { color: var(--wrong); } .notes { list-style: none; padding: 0; margin: 1rem 0 0; display: grid; gap: .5rem; font-size: .93rem; } .notes li { display: flex; gap: .65rem; color: var(--muted); } .notes .letter { font-family: var(--mono); color: var(--text); } .source { font-size: .875rem; color: var(--muted); margin-top: 1rem !important; } #next { margin-top: 1.75rem; } /* ─────────────────────────── results ─────────────────────────── */ .breakdown { list-style: none; padding: 0; margin: 0; display: grid; gap: 1rem; } .breakdown .row { display: flex; justify-content: space-between; font-size: .95rem; margin-bottom: .35rem; } .breakdown .tally { color: var(--muted); font-variant-numeric: tabular-nums; } .bar { height: 6px; border-radius: 3px; background: var(--border); overflow: hidden; } .bar > i { display: block; height: 100%; background: var(--accent); } .review { padding-left: 1.3rem; margin: 0; display: grid; gap: 1.1rem; } .review li::marker { color: var(--muted); font-variant-numeric: tabular-nums; } .review .q { display: block; margin-bottom: .3rem; } .review .a { display: block; font-size: .9rem; color: var(--muted); } .review .a.correct { color: var(--correct); } .review .a.wrong { color: var(--wrong); } #restart { margin-top: 2.5rem; } /* ─────────────────────────── mode picker ─────────────────────────── */ .filters { display: flex; flex-wrap: wrap; gap: 1.5rem; align-items: center; margin: 2rem 0 1.25rem; font-size: .9rem; color: var(--muted); } .filters label { display: flex; align-items: center; gap: .5rem; } .filters select { font: inherit; color: var(--text); background: var(--surface); border: 1px solid var(--border); border-radius: 8px; padding: .4rem .6rem; max-width: min(24rem, 60vw); } .filters .check { cursor: pointer; } .filters input[type="checkbox"] { accent-color: var(--accent); width: 1rem; height: 1rem; } .modes { display: grid; gap: .85rem; grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr)); } .mode-card { display: grid; gap: .3rem; text-align: left; background: var(--surface); color: var(--text); border: 1px solid var(--border); border-left: 3px solid var(--accent); border-radius: var(--radius); padding: 1.15rem 1.25rem; box-shadow: var(--shadow); transition: border-color .15s ease, transform .05s ease; } .mode-card:hover { border-color: var(--accent); } .mode-card:active { transform: translateY(1px); } .mode-name { font-weight: 650; font-size: 1.05rem; letter-spacing: -.01em; } .mode-count { font-size: .78rem; letter-spacing: .06em; text-transform: uppercase; color: var(--accent); } .mode-desc { font-size: .9rem; color: var(--muted); line-height: 1.5; } /* ─────────────────────────── drills ─────────────────────────── */ .timer { margin-left: auto; font-family: var(--mono); font-variant-numeric: tabular-nums; letter-spacing: 0; text-transform: none; } .timer.over { color: var(--wrong); } #drill-prompt { font-weight: 500; } .solution { background: var(--code-bg); border: 1px solid var(--border); border-left: 3px solid var(--correct); border-radius: var(--radius); padding: 1.1rem 1.2rem; margin: 0 0 1.5rem; font-family: var(--mono); font-size: .84rem; line-height: 1.6; white-space: pre; overflow-x: auto; } .grade { display: flex; flex-wrap: wrap; gap: .7rem; margin-top: 1.75rem; } .secondary { background: var(--surface); color: var(--muted); border: 1px solid var(--border); border-radius: var(--radius); padding: .7rem 1.35rem; font-weight: 600; } .secondary:hover { color: var(--text); border-color: var(--accent); } .bar > i.low { background: var(--wrong); } #restart { margin-top: 0; } /* ─────────────────────────── answer box ─────────────────────────── */ .field-label { display: block; margin: 1.75rem 0 .5rem; font-size: .8rem; letter-spacing: .06em; text-transform: uppercase; color: var(--muted); } #attempt { display: block; width: 100%; min-height: 9.5rem; resize: vertical; background: var(--code-bg); color: var(--text); border: 1px solid var(--border); border-radius: var(--radius); padding: .9rem 1rem; font-family: var(--mono); font-size: .85rem; line-height: 1.6; tab-size: 2; } #attempt::placeholder { color: var(--muted); opacity: .65; } #attempt:focus { border-color: var(--accent); outline: none; box-shadow: 0 0 0 3px var(--accent-dim); } #attempt:read-only { opacity: .8; border-style: dashed; } .submit-row { display: flex; flex-wrap: wrap; align-items: center; gap: .9rem; margin: 1.1rem 0 0; } .submit-row .hint { margin: 0; } /* ─────────────────────────── keyword check ─────────────────────────── */ #compare { margin-bottom: 2rem; } #compare h3 { margin-top: 0; } .compare-summary { font-weight: 650; margin: 0 0 .9rem; } .compare-summary.correct { color: var(--correct); } .compare-summary.partial { color: var(--text); } .compare-summary.wrong { color: var(--wrong); } .keys { list-style: none; padding: 0; margin: 0; display: grid; gap: .4rem; } .keys li { display: flex; gap: .6rem; align-items: baseline; font-size: .9rem; } .keys .mark { font-family: var(--mono); width: 1rem; flex: 0 0 auto; } .keys li.hit .mark { color: var(--correct); } .keys li.miss .mark { color: var(--wrong); } .keys li.miss code { color: var(--wrong); } .caveat { margin: 1.1rem 0 0; padding-top: .9rem; border-top: 1px solid var(--border); font-size: .85rem; line-height: 1.55; color: var(--muted); } /* ─────────────────────────── study guide ─────────────────────────── */ .sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0; } .guide-controls { margin: 2rem 0 1.5rem; display: grid; gap: .9rem; } #guide-search { width: 100%; background: var(--surface); color: var(--text); border: 1px solid var(--border); border-radius: var(--radius); padding: .6rem .85rem; font: inherit; font-size: .95rem; } #guide-search::placeholder { color: var(--muted); opacity: .8; } #guide-search:focus { border-color: var(--accent); outline: none; box-shadow: 0 0 0 3px var(--accent-dim); } .chips { display: flex; flex-wrap: wrap; gap: .4rem; } .chip { background: var(--surface); color: var(--muted); border: 1px solid var(--border); border-radius: 999px; padding: .3rem .75rem; font-size: .82rem; font-variant-numeric: tabular-nums; transition: border-color .15s ease, color .15s ease; } .chip:hover { color: var(--text); border-color: var(--accent); } .chip.on { background: var(--accent-dim); color: var(--accent); border-color: var(--accent); } #guide-topics { display: grid; gap: .6rem; } .topic { background: var(--surface); border: 1px solid var(--border); border-left: 3px solid var(--accent); border-radius: var(--radius); box-shadow: var(--shadow); } .topic > summary { display: flex; align-items: baseline; justify-content: space-between; gap: 1rem; padding: .9rem 1.15rem; cursor: pointer; list-style: none; } .topic > summary::-webkit-details-marker { display: none; } .topic > summary:hover .topic-title { color: var(--accent); } .topic[open] > summary { border-bottom: 1px solid var(--border); } .topic-title { font-weight: 600; letter-spacing: -.01em; } .topic > summary .domain-tag { flex: 0 0 auto; text-transform: uppercase; } .topic-body { padding: 1.15rem 1.15rem .35rem; } .topic-summary { margin: 0 0 1.1rem; color: var(--text); } .points, .gotchas { margin: 0 0 1.2rem; padding-left: 1.15rem; display: grid; gap: .45rem; font-size: .95rem; } .points li::marker { color: var(--accent); } .gotchas { color: var(--muted); } .gotchas li::marker { color: var(--wrong); } .gotcha-head { margin: 0 0 .5rem; font-size: .78rem; letter-spacing: .06em; text-transform: uppercase; color: var(--muted); } .cmds { list-style: none; padding: 0; margin: 0 0 1.2rem; display: grid; gap: .55rem; } .cmds .what { display: block; font-size: .82rem; color: var(--muted); margin-bottom: .25rem; } .cmds .run { margin: 0; padding: .65rem .8rem; background: var(--code-bg); border: 1px solid var(--border); border-radius: 8px; font-family: var(--mono); font-size: .82rem; line-height: 1.55; white-space: pre; overflow-x: auto; } .topic-foot { display: flex; flex-wrap: wrap; align-items: center; gap: .9rem; border-top: 1px solid var(--border); padding: .9rem 0 1rem; margin-top: 0 !important; } .topic-drill { margin-left: auto; flex: 0 0 auto; } #guide-drill:disabled { opacity: .5; cursor: default; filter: none; } #guide .grade { margin-top: 2.5rem; }