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var(--color-border);border-radius:999px;display:inline-block}.ui-badge[data-tone=success]{background:var(--color-success-bg);color:var(--color-success);border-color:#0000}.ui-badge[data-tone=danger]{background:var(--color-danger-bg);color:var(--color-danger);border-color:#0000}.ui-field{gap:var(--space-1);flex-direction:column;display:flex}.ui-field label{font-weight:600;font-size:var(--text-sm)}.ui-input{min-height:44px;padding:var(--space-2) var(--space-3);font:inherit;border:1px solid var(--color-border);border-radius:var(--radius-md);background:var(--color-bg);color:var(--color-text)}.ui-alert{border-radius:var(--radius-md);padding:var(--space-3) var(--space-4)}.ui-alert[data-tone=success]{background:var(--color-success-bg);color:var(--color-success)}.ui-alert[data-tone=danger]{background:var(--color-danger-bg);color:var(--color-danger)}.ui-alert[data-tone=info]{background:var(--color-info-bg)}.ui-alert[data-tone=warning]{background:var(--color-warning-bg)}.ui-progress{gap:var(--space-2);flex-direction:column;display:flex}.ui-progress-meta{justify-content:space-between;gap:var(--space-2);font-size:var(--text-sm);flex-wrap:wrap;display:flex}.ui-progress-label{font-weight:600}.ui-progress-value{font-variant-numeric:tabular-nums}.ui-progress-track{background:var(--color-surface);border:1px solid var(--color-border);border-radius:999px;height:.5rem;overflow:hidden}.ui-progress-fill{background:var(--color-primary);border-radius:inherit;height:100%;transition:width .2s}.ui-empty{border:1px dashed var(--color-border);border-radius:var(--radius-lg);padding:var(--space-6) var(--space-5);text-align:center;background:var(--color-surface)}.ui-empty-title{margin:0 0 var(--space-2);font-weight:700;font-size:var(--text-lg)}.ui-empty-action{margin-top:var(--space-4)}
.visually-hidden{clip:rect(0 0 0 0);white-space:nowrap;width:1px;height:1px;position:absolute;overflow:hidden}.pc-block{margin:var(--space-5) 0}.pc-callout{border-left:4px solid var(--color-primary);background:var(--color-info-bg);padding:var(--space-3) var(--space-4);border-radius:var(--radius-md)}.pc-callout[data-kind=warning]{border-color:var(--color-danger);background:var(--color-warning-bg)}.pc-callout[data-kind=tip]{border-color:var(--color-success);background:var(--color-success-bg)}.pc-callout>:last-child{margin-bottom:0}.pc-callout-title{margin:0 0 var(--space-1)}.pc-worked{border:1px solid var(--color-border);border-radius:var(--radius-lg);padding:var(--space-4);background:var(--color-surface)}.pc-worked-title{margin-top:0}.pc-worked-steps{padding-left:var(--space-5)}.pc-worked-steps li{margin-bottom:var(--space-2)}.pc-calculator{border:1px solid var(--color-border);border-radius:var(--radius-lg);padding:var(--space-4);background:var(--color-surface);margin-left:0;margin-right:0}.pc-calculator-inputs{gap:var(--space-4);grid-template-columns:repeat(auto-fit,minmax(14rem,1fr));display:grid}.pc-calculator-input label{font-weight:600;font-size:var(--text-sm);margin-bottom:var(--space-1);display:block}.pc-calculator-input input[type=range]{flex:1;min-width:6rem}.pc-number{width:7rem}.pc-calculator-output{margin-top:var(--space-4);padding-top:var(--space-3);border-top:1px solid var(--color-border);font-size:var(--text-lg);justify-content:space-between;align-items:baseline;display:flex}.pc-plot{margin-left:0;margin-right:0}.pc-plot-svg{background:var(--color-surface-raised);border:1px solid var(--color-border);border-radius:var(--radius-lg);width:100%;height:auto;display:block}.pc-plot-tick{fill:var(--color-text-muted);font-size:12px}.pc-plot-label{fill:var(--color-text);font-size:14px}.pc-plot-legend{gap:var(--space-4);margin:var(--space-2) 0 0;flex-wrap:wrap;padding:0;list-style:none;display:flex}.pc-plot-legend li{gap:var(--space-2);align-items:center;display:flex}.pc-plot-sliders{gap:var(--space-2);margin-top:var(--space-3);display:grid}.pc-slider{gap:var(--space-3);grid-template-columns:minmax(10rem,1fr) 2fr 3rem;align-items:center;display:grid}.pc-slider input{width:100%;min-height:32px}.pc-slider output{font-variant-numeric:tabular-nums;text-align:right}@media (max-width:30rem){.pc-slider{grid-template-columns:1fr 3rem}.pc-slider label{grid-column:1/-1}}.pc-plot-table{margin-top:var(--space-3)}.pc-plot-table table{border-collapse:collapse;margin-top:var(--space-2);font-variant-numeric:tabular-nums}.pc-plot-table th,.pc-plot-table td{border:1px solid var(--color-border);padding:var(--space-1) var(--space-3);text-align:right}.pc-exercise{border:1px solid var(--color-border);border-radius:var(--radius-lg);padding:var(--space-4);background:var(--color-surface-raised);box-shadow:var(--shadow-sm);gap:var(--space-3);flex-direction:column;display:flex}.pc-exercise-prompt p{margin:0}.pc-options{gap:var(--space-2);border:0;margin:0;padding:0;display:grid}.pc-option{gap:var(--space-3);min-height:44px;padding:var(--space-2) var(--space-3);border:1px solid var(--color-border);border-radius:var(--radius-md);cursor:pointer;align-items:center;display:flex}.pc-option:has(input:checked){border-color:var(--color-primary);background:var(--color-info-bg)}.pc-option input{width:1.1rem;height:1.1rem}.pc-preview{font-size:var(--text-sm)}.pc-exercise-feedback:empty{display:none}
body{font-family:var(--font-sans), "Source Sans 3", "Segoe UI", sans-serif}.site-header{border-bottom:1px solid var(--color-border);background:var(--color-surface)}.site-header-inner{justify-content:space-between;align-items:center;gap:var(--space-4);max-width:72rem;min-height:3.5rem;padding:0 var(--space-4);margin:0 auto;display:flex}.site-logo{color:var(--color-text);font-weight:700;font-family:var(--font-serif), "Source Serif 4", Georgia, serif;letter-spacing:-.02em;text-decoration:none}.site-nav{gap:var(--space-4);display:flex}main{padding:var(--space-6) 0 var(--space-7)}.breadcrumbs{font-size:var(--text-sm)}.breadcrumbs ol{gap:var(--space-2);margin:0 0 var(--space-4);flex-wrap:wrap;padding:0;list-style:none;display:flex}.breadcrumbs li+li:before{content:"/";margin-right:var(--space-2);color:var(--color-text-muted)}.course-continue{margin:var(--space-5) 0 var(--space-6);padding:var(--space-4);border:1px solid var(--color-border);border-radius:var(--radius-lg);background:linear-gradient(160deg, var(--color-info-bg), var(--color-surface))}.lesson-shell{--player-max:72rem;max-width:var(--player-max);padding:0 var(--space-4);gap:var(--space-5);margin:0 auto;display:grid}@media (min-width:56rem){.lesson-shell{grid-template-columns:15rem minmax(0,1fr);align-items:start}.lesson-outline{top:var(--space-4);position:sticky}}.lesson-outline{border:1px solid var(--color-border);border-radius:var(--radius-lg);background:var(--color-surface);padding:var(--space-4)}.lesson-outline h2{margin:0 0 var(--space-3);font-size:var(--text-sm);text-transform:uppercase;letter-spacing:.04em;color:var(--color-text-muted);font-weight:700}.lesson-outline ol{gap:var(--space-1);margin:0;padding:0;list-style:none;display:grid}.lesson-outline a{padding:var(--space-2) var(--space-3);border-radius:var(--radius-md);color:var(--color-text);font-size:var(--text-sm);align-items:center;min-height:44px;text-decoration:none;display:flex}.lesson-outline a:hover{background:var(--color-surface-raised)}.lesson-outline a[aria-current=page]{background:var(--color-info-bg);color:var(--color-primary);font-weight:600}.lesson-main{min-width:0}.lesson-progress-wrap{margin-bottom:var(--space-4)}.lesson article.lesson{max-width:var(--content-width)}.lesson article.lesson h1,.lesson article.lesson h2,.lesson article.lesson h3{font-family:var(--font-serif), "Source Serif 4", Georgia, serif;letter-spacing:-.02em}.lesson-nav{justify-content:space-between;gap:var(--space-3);margin-top:var(--space-7);border-top:1px solid var(--color-border);padding-top:var(--space-4);background:color-mix(in srgb, var(--color-bg) 92%, transparent);-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px);padding-bottom:var(--space-4);z-index:2;display:flex;position:sticky;bottom:0}.lesson-list{gap:var(--space-2);padding:0;list-style:none;display:grid}.lesson-list a{justify-content:space-between;gap:var(--space-3);padding:var(--space-3) var(--space-4);border:1px solid var(--color-border);border-radius:var(--radius-md);color:var(--color-text);align-items:center;min-height:44px;text-decoration:none;display:flex}.lesson-list a:hover{border-color:var(--color-primary)}.lesson .katex-display{padding:var(--space-1) 0;overflow:auto hidden}.swatches{gap:var(--space-3);grid-template-columns:repeat(auto-fill,minmax(9rem,1fr));display:grid}.swatch{border:1px solid var(--color-border);border-radius:var(--radius-md);font-size:var(--text-sm);overflow:hidden}.swatch div{height:3rem}.swatch span{padding:var(--space-1) var(--space-2);font-family:var(--font-mono);display:block}.auth-panel{max-width:36rem;margin:2rem auto;padding:1rem}.auth-form{gap:1rem;display:grid}