/* ============================================================ Calculus English Vocab — "坐标纸 / 精密仪器" design system Light & dark themes via [data-theme] on . Canvas / 3D scenes always render on light "paper" panels. ============================================================ */ :root { --font-display: "Space Grotesk", -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif; --font-body: -apple-system, "PingFang SC", "Helvetica Neue", "Microsoft YaHei", sans-serif; --font-mono: "JetBrains Mono", "SF Mono", Menlo, Consolas, monospace; --bg: oklch(0.965 0.006 250); --surface: oklch(0.985 0.004 250); --surface-2: oklch(0.945 0.008 250); --ink: oklch(0.27 0.03 262); --ink-2: oklch(0.43 0.028 262); --ink-3: oklch(0.56 0.022 260); --line: oklch(0.895 0.012 252); --grid-line: oklch(0.91 0.014 252 / 0.55); --accent: oklch(0.5 0.165 262); --accent-strong: oklch(0.44 0.155 262); --accent-soft: color-mix(in oklch, var(--accent) 9%, transparent); --accent-line: color-mix(in oklch, var(--accent) 35%, var(--line)); --highlight: oklch(0.7 0.14 70); --good: oklch(0.55 0.14 155); --bad: oklch(0.55 0.19 27); --good-soft: color-mix(in oklch, var(--good) 10%, transparent); --bad-soft: color-mix(in oklch, var(--bad) 10%, transparent); --paper: oklch(0.965 0.006 250); /* canvas paper — constant across themes */ --on-accent: var(--on-accent); /* text on filled accent/good/bad buttons */ --radius: 8px; --nav-h: 56px; color-scheme: light; } html[data-theme="dark"] { --bg: oklch(0.185 0.02 266); --surface: oklch(0.225 0.02 266); --surface-2: oklch(0.265 0.022 266); --ink: oklch(0.92 0.012 252); --ink-2: oklch(0.76 0.018 256); --ink-3: oklch(0.62 0.02 258); --line: oklch(0.31 0.022 264); --grid-line: oklch(0.34 0.025 264 / 0.5); --accent: oklch(0.74 0.125 252); --accent-strong: oklch(0.8 0.11 252); --accent-soft: color-mix(in oklch, var(--accent) 14%, transparent); --accent-line: color-mix(in oklch, var(--accent) 40%, var(--line)); --highlight: oklch(0.78 0.13 75); --good: oklch(0.72 0.14 155); --bad: oklch(0.68 0.17 27); --good-soft: color-mix(in oklch, var(--good) 16%, transparent); --bad-soft: color-mix(in oklch, var(--bad) 16%, transparent); --on-accent: oklch(0.2 0.03 262); color-scheme: dark; } * { box-sizing: border-box; } html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; } body { margin: 0; font-family: var(--font-body); background-color: var(--bg); /* signature graph-paper grid */ background-image: linear-gradient(var(--grid-line) 1px, transparent 1px), linear-gradient(90deg, var(--grid-line) 1px, transparent 1px); background-size: 28px 28px; color: var(--ink); line-height: 1.65; transition: background-color .3s ease, color .3s ease; } ::selection { background: color-mix(in oklch, var(--accent) 25%, transparent); } a { color: var(--accent); text-decoration: none; } a:hover { text-decoration: underline; text-underline-offset: 3px; } h1, h2, h3 { font-family: var(--font-display); letter-spacing: 0.01em; } h1 { font-size: clamp(24px, 3.4vw, 32px); margin: 8px 0 16px; font-weight: 700; } h2 { font-size: 19px; margin: 28px 0 10px; font-weight: 600; } h3 { font-size: 16px; margin: 18px 0 8px; font-weight: 600; } /* crosshair tick on section headers — the coordinate-system motif */ h2::before { content: ""; display: inline-block; width: 14px; height: 14px; margin-right: 8px; vertical-align: -1px; background: linear-gradient(var(--accent), var(--accent)) center / 14px 1.5px no-repeat, linear-gradient(var(--accent), var(--accent)) center / 1.5px 14px no-repeat; opacity: .8; } .muted { color: var(--ink-3); } .small { font-size: 13px; } /* ---------------- nav ---------------- */ .site-nav { position: sticky; top: 0; z-index: 50; display: flex; align-items: center; gap: 2px; height: var(--nav-h); padding: 0 16px; background: color-mix(in oklch, var(--bg) 82%, transparent); -webkit-backdrop-filter: blur(12px); backdrop-filter: blur(12px); border-bottom: 1px solid var(--line); overflow-x: auto; white-space: nowrap; transition: background-color .3s ease, border-color .3s ease; } .site-nav .brand { font-family: var(--font-display); font-weight: 700; font-size: 15px; margin-right: 14px; color: var(--ink); letter-spacing: .02em; } .site-nav .brand .glyph { color: var(--accent); margin-right: 4px; } .site-nav a.brand:hover { text-decoration: none; } .site-nav a.nav-link { color: var(--ink-2); padding: 6px 11px; border-radius: 6px; font-size: 14px; transition: color .15s ease, background-color .15s ease; } .site-nav a.nav-link:hover { background: var(--accent-soft); color: var(--accent-strong); text-decoration: none; } .site-nav a.nav-link.active { color: var(--accent-strong); background: var(--accent-soft); font-weight: 600; } .site-nav .spacer { flex: 1; } /* ruler ticks under the nav — instrument detail */ .nav-ruler { position: sticky; top: var(--nav-h); z-index: 49; height: 7px; background-image: repeating-linear-gradient(90deg, var(--line) 0 1px, transparent 1px 14px); background-position: 0 0; -webkit-mask-image: linear-gradient(#000 3px, transparent 7px); mask-image: linear-gradient(#000 3px, transparent 7px); opacity: .8; pointer-events: none; } .theme-toggle { flex: none; display: inline-flex; align-items: center; justify-content: center; width: 34px; height: 34px; margin-left: 8px; border: 1px solid var(--line); border-radius: 50%; background: var(--surface); color: var(--ink-2); cursor: pointer; transition: border-color .15s ease, color .15s ease, transform .2s ease; } .theme-toggle:hover { border-color: var(--accent); color: var(--accent); transform: rotate(18deg); } .theme-toggle:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; } .theme-toggle svg { width: 17px; height: 17px; } html[data-theme="light"] .icon-moon { display: none; } html[data-theme="dark"] .icon-sun { display: none; } /* ---------------- layout ---------------- */ .wrap { max-width: 880px; margin: 0 auto; padding: 24px 16px 64px; } .wrap-wide { max-width: 1100px; } /* ---------------- hero (index) ---------------- */ .hero { display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr); gap: 32px; align-items: center; padding: 40px 0 28px; } .hero-eyebrow { font-family: var(--font-mono); font-size: 12px; letter-spacing: .18em; color: var(--accent); margin: 0 0 10px; } .hero h1 { font-size: clamp(34px, 5.6vw, 54px); line-height: 1.15; margin: 0 0 14px; } .hero .lede { color: var(--ink-2); font-size: 16px; max-width: 46ch; margin: 0 0 22px; } .hero-art { border: 1px solid var(--line); border-radius: var(--radius); background: var(--paper); padding: 8px; transition: border-color .3s ease; } .hero-art svg { display: block; width: 100%; height: auto; } .hero-actions { display: flex; gap: 10px; flex-wrap: wrap; } @media (max-width: 720px) { .hero { grid-template-columns: 1fr; padding-top: 24px; } .hero-art { order: -1; } } /* ---------------- cards & components ---------------- */ .card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 20px; margin-bottom: 16px; transition: border-color .2s ease, transform .2s ease, background-color .3s ease; } a.card:hover { border-color: var(--accent-line); transform: translateY(-2px); text-decoration: none; } .btn { display: inline-block; border: 1px solid var(--line); background: var(--surface); color: var(--ink); border-radius: 6px; padding: 8px 16px; font-size: 14px; font-family: var(--font-display); font-weight: 500; cursor: pointer; transition: border-color .15s ease, background-color .15s ease, color .15s ease, filter .15s ease; } .btn:hover { border-color: var(--accent); color: var(--accent-strong); } .btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; } .btn.primary { background: var(--accent); border-color: var(--accent); color: var(--on-accent); } .btn.primary:hover { filter: brightness(1.12); color: var(--on-accent); } .btn.good { background: var(--good); border-color: var(--good); color: var(--on-accent); } .btn.bad { background: var(--bad); border-color: var(--bad); color: var(--on-accent); } .btn.good:hover, .btn.bad:hover { filter: brightness(1.12); } .tag { display: inline-block; font-size: 12px; font-family: var(--font-mono); padding: 2px 8px; border-radius: 4px; background: var(--accent-soft); color: var(--accent-strong); margin-right: 6px; } input[type="text"], input[type="search"], input[type="number"], select { font-family: var(--font-body); font-size: 15px; padding: 9px 12px; border: 1px solid var(--line); border-radius: 6px; background: var(--surface); color: var(--ink); width: 100%; transition: border-color .15s ease, box-shadow .15s ease; } input:focus, select:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); } input[type="range"] { accent-color: var(--accent); } input[type="checkbox"] { accent-color: var(--accent); } .speak-btn { border: 1px solid transparent; background: none; cursor: pointer; font-size: 17px; padding: 2px 6px; border-radius: 6px; transition: background-color .15s ease, border-color .15s ease; } .speak-btn:hover { background: var(--accent-soft); border-color: var(--accent-line); } .phonetic { color: var(--ink-3); font-size: 15px; font-family: var(--font-mono); } .formula-block { background: var(--paper); border: 1px solid var(--line); border-radius: 6px; padding: 12px 16px; margin: 8px 0; overflow-x: auto; color: oklch(0.27 0.03 262); /* formulas always on paper */ } html[data-theme="dark"] .formula-block { border-color: transparent; } .example { border-left: 2px solid var(--accent-line); padding: 4px 0 4px 14px; margin: 10px 0; } .example .en { color: var(--ink); } .example .cn { color: var(--ink-2); font-size: 14px; } .chip-grid { display: flex; flex-wrap: wrap; gap: 8px; } .chip { border: 1px solid var(--line); border-radius: 999px; padding: 5px 14px; font-size: 14px; color: var(--ink-2); background: var(--surface); cursor: pointer; transition: border-color .15s ease, color .15s ease, background-color .15s ease; } .chip:hover { border-color: var(--accent); color: var(--accent-strong); text-decoration: none; } .chip.active { background: var(--accent); border-color: var(--accent); color: var(--on-accent); } .stat-row { display: flex; gap: 12px; flex-wrap: wrap; } .stat-box { flex: 1; min-width: 120px; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 16px; text-align: center; position: relative; transition: border-color .2s ease; } .stat-box:hover { border-color: var(--accent-line); } .stat-box .num { font-family: var(--font-mono); font-size: 28px; font-weight: 600; color: var(--accent-strong); font-variant-numeric: tabular-nums; } .stat-box .lbl { font-size: 13px; color: var(--ink-3); } /* word list */ .word-item { display: flex; align-items: baseline; gap: 10px; padding: 10px 12px; border-radius: 6px; border: 1px solid transparent; transition: background-color .12s ease, border-color .12s ease; } .word-item:hover { background: var(--surface); border-color: var(--line); } .word-item .term { font-weight: 600; min-width: 200px; font-family: var(--font-display); } .word-item .cn { color: var(--ink-2); } .mastery-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--line); flex: none; align-self: center; } .mastery-dot.m1 { background: oklch(0.75 0.15 85); } .mastery-dot.m2 { background: oklch(0.7 0.16 60); } .mastery-dot.m3 { background: oklch(0.72 0.14 155); } .mastery-dot.m4, .mastery-dot.m5 { background: var(--good); } /* flashcards — index-card on graph paper */ .flashcard { perspective: 1200px; cursor: pointer; user-select: none; height: 300px; margin: 16px 0; } .flashcard-inner { position: relative; width: 100%; height: 100%; transition: transform .5s cubic-bezier(.22,1,.36,1); transform-style: preserve-3d; } .flashcard.flipped .flashcard-inner { transform: rotateY(180deg); } .flashcard-face { position: absolute; inset: 0; backface-visibility: hidden; -webkit-backface-visibility: hidden; background-color: var(--paper); background-image: linear-gradient(var(--grid-line) 1px, transparent 1px), linear-gradient(90deg, var(--grid-line) 1px, transparent 1px); background-size: 24px 24px; color: oklch(0.27 0.03 262); border: 1px solid var(--line); border-radius: var(--radius); display: flex; flex-direction: column; align-items: center; justify-content: center; padding: 24px; text-align: center; gap: 8px; } .flashcard-face.back { transform: rotateY(180deg); } .flashcard-face .big { font-size: 30px; font-weight: 700; font-family: var(--font-display); } .flashcard-face .muted { color: oklch(0.5 0.02 260); } .flashcard-face .example .en { color: oklch(0.27 0.03 262); } .flashcard-face .example .cn { color: oklch(0.45 0.02 260); } /* quiz */ .quiz-option { display: block; width: 100%; text-align: left; margin: 8px 0; padding: 12px 16px; border: 1px solid var(--line); border-radius: 6px; background: var(--surface); cursor: pointer; font-size: 15px; font-family: var(--font-display); color: var(--ink); transition: border-color .12s ease, background-color .12s ease, transform .12s ease; } .quiz-option:hover:not(:disabled) { border-color: var(--accent); transform: translateX(3px); } .quiz-option:disabled { cursor: default; } .quiz-option.correct { border-color: var(--good); background: var(--good-soft); } .quiz-option.wrong { border-color: var(--bad); background: var(--bad-soft); } /* viz pages — illuminated paper panel */ .viz-stage { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 12px; margin: 12px 0; transition: background-color .3s ease, border-color .3s ease; } .viz-canvas { width: 100%; display: block; border-radius: 6px; background: var(--paper); border: 1px solid var(--line); } .viz-controls { display: flex; flex-wrap: wrap; gap: 14px; align-items: center; margin: 10px 0; font-size: 14px; } .viz-controls label { display: flex; align-items: center; gap: 8px; color: var(--ink-2); } .viz-controls input[type="range"] { width: 140px; } .viz-controls input[type="text"], .viz-controls input[type="number"] { width: 160px; padding: 5px 9px; font-size: 14px; } .viz-readout { font-family: var(--font-mono); font-size: 13px; color: var(--ink-2); background: var(--surface); border: 1px solid var(--line); border-radius: 6px; padding: 10px 14px; margin-top: 8px; min-height: 20px; position: relative; font-variant-numeric: tabular-nums; } /* corner bracket detail on readouts */ .viz-readout::before, .viz-readout::after { content: ""; position: absolute; width: 8px; height: 8px; border-color: var(--accent); border-style: solid; opacity: .9; } .viz-readout::before { top: -1px; left: -1px; border-width: 1.5px 0 0 1.5px; } .viz-readout::after { bottom: -1px; right: -1px; border-width: 0 1.5px 1.5px 0; } .grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; } .grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; } @media (max-width: 720px) { .grid-2, .grid-3 { grid-template-columns: 1fr; } .word-item .term { min-width: 0; } .word-item { flex-wrap: wrap; } } .cat-header { display: flex; align-items: center; gap: 10px; margin: 26px 0 6px; } .cat-header h2 { margin: 0; } .progress-track { height: 6px; background: var(--line); border-radius: 3px; overflow: hidden; } .progress-fill { height: 100%; background: var(--accent); transition: width .3s ease; } @media (prefers-reduced-motion: reduce) { *, *::before, *::after { transition-duration: .01ms !important; animation-duration: .01ms !important; } html { scroll-behavior: auto; } }