@layer components{.course-surface{background:linear-gradient(to right, var(--course-veil-edge) 0%, var(--course-veil) 14%, var(--course-veil) 86%, var(--course-veil-edge) 100%);position:relative}.course-surface--cyan{--course-accent:var(--accent-cyan)}.aih-surface{--course-accent:var(--accent-gold);--course-measure:43.6875rem;background:#0a0f0d;position:relative}@media (min-width:1024px){.aih-surface .course-layout{grid-template-columns:273px minmax(0,1fr)}}@media (min-width:1280px){.aih-surface .course-layout{grid-template-columns:273px minmax(0,1fr) 232px}}.aih-surface .course-h1{letter-spacing:-.034em;font-weight:700}.aih-surface .course-h2{font-weight:700}.aih-surface .course-meta{color:var(--text-secondary);font-size:1rem}.aih-surface .course-meta-num{font-family:var(--font-sans);color:var(--text-primary);border:0;padding:0;font-size:1rem;font-weight:600}.aih-surface .course-link{text-underline-offset:4px}.aih-surface .course-code{background:#ffffff0e;border:0;border-radius:4px;padding:2px 6px;font-size:.75rem;line-height:1.35}.aih-surface .course-callout{border:1px solid color-mix(in srgb, var(--course-accent) 30%, transparent);background:color-mix(in srgb, var(--course-accent) 5%, transparent);border-radius:.6rem;padding:1rem 1.25rem}.aih-surface .course-callout:before{display:none}.aih-surface .course-callout--warn{border-color:color-mix(in srgb, var(--accent-warning) 30%, transparent);background:color-mix(in srgb, var(--accent-warning) 5%, transparent)}.aih-surface .course-callout--quote{border-color:color-mix(in srgb, var(--accent-cyan) 30%, transparent);background:color-mix(in srgb, var(--accent-cyan) 5%, transparent)}.aih-surface .course-code-block{background:#0e1411;border-color:#ffffff17}.aih-surface .course-code-head{border-bottom-color:#ffffff12}.aih-surface .course-table th,.aih-surface .course-table td{padding:1rem 1.25rem}.aih-surface .course-rail-nav{border-left-color:#ffffff17}.aih-surface .course-copy,.aih-surface .course-code-note{font-size:.75rem}.aih-surface .course-crumbs a,.aih-surface .course-code-label{color:var(--text-tertiary)}.aih-toc-row{transition:background var(--duration-fast) var(--ease-smooth);border-radius:.5rem;align-items:baseline;gap:1rem;padding:.85rem .75rem;display:flex}.aih-toc-row:hover{background:var(--bg-hover)}.aih-toc-num{width:2.2rem;font-family:var(--font-mono);color:var(--course-accent);font-variant-numeric:tabular-nums;flex-shrink:0;font-size:.8125rem}.aih-toc-title{min-width:0;color:var(--text-primary);flex:1;font-size:1.0625rem;font-weight:500;line-height:1.4}.aih-toc-sub{color:var(--text-tertiary);margin-top:.15rem;font-size:.875rem;font-weight:400;display:block}.aih-toc-min{font-family:var(--font-mono);color:var(--text-muted);font-variant-numeric:tabular-nums;flex-shrink:0;font-size:.75rem}.course-t-meta{letter-spacing:.01em;font-size:.6875rem;line-height:1.45}.course-t-small{font-size:.9375rem;line-height:1.55}.course-t-body{font-size:1.09375rem;line-height:1.68}.course-t-h3{letter-spacing:-.012em;font-size:1.3125rem;font-weight:600;line-height:1.4}.course-r-sm{border-radius:.5rem}.course-r-md{border-radius:.75rem}.course-blocks>*+*{margin-top:1.15rem}.course-blocks>*+:is(.course-table-wrap,figure,.course-grid,.course-links){margin-top:1.75rem}.course-prose{color:var(--text-secondary);font-size:1.09375rem;line-height:1.68}.course-reading{min-width:0;max-width:var(--course-col,100%)}.course-measure,.course-prose :is(.course-h2,.course-h3,.course-lead,.course-p,.course-list,.course-remember,.course-win-when,.course-who-steps,.course-primary-sources,.course-citations,.course-quiz,.course-callout,.course-code-block,.course-step-list){max-width:var(--course-measure)}.course-prose :is(figure:not(.course-code-block),.course-table-wrap,.course-grid),.course-prose :is(figure:not(.course-code-block),.course-table-wrap,.course-grid) :is(p,ul,ol,.course-p,.course-list){max-width:none}.course-prose .course-souls{grid-template-columns:repeat(auto-fit,minmax(13rem,1fr));gap:.75rem;margin-top:1.5rem;display:grid}.course-prose .course-soul-card{text-align:left;border:1px solid var(--border-subtle);border-radius:var(--radius-md,.75rem);background:var(--surface-card);cursor:pointer;flex-direction:column;gap:.35rem;padding:1rem 1.1rem;transition:border-color .15s;display:flex}.course-prose .course-soul-card:hover{border-color:var(--course-accent,var(--accent-orange))}.course-prose .course-soul-name{color:var(--text-primary);font-weight:600}.course-prose .course-soul-why{color:var(--text-secondary);font-size:.8125rem;line-height:1.5}.course-prose .course-soul-cue{letter-spacing:1px;text-transform:uppercase;color:var(--course-accent,var(--accent-orange));margin-top:.35rem;font-size:.6875rem}.course-soul-dialog{border:1px solid var(--border-default);border-radius:var(--radius-md,.75rem);background:var(--bg-deep);width:min(48rem,100vw - 2rem);max-height:min(80vh,44rem);color:var(--text-primary);padding:0}.course-soul-dialog::backdrop{background:#0009}.course-soul-dialog-head{border-bottom:1px solid var(--border-subtle);justify-content:space-between;align-items:flex-start;gap:1rem;padding:1rem 1.15rem;display:flex}.course-soul-dialog-title{font-weight:600}.course-soul-dialog-sub{color:var(--text-tertiary);margin-top:.15rem;font-size:.8125rem}.course-soul-dialog-actions{flex-shrink:0;align-items:center;gap:.5rem;display:flex}.course-soul-close{color:var(--text-tertiary);cursor:pointer;border-radius:.375rem;padding:.25rem .5rem}.course-soul-close:hover{color:var(--text-primary)}.course-soul-body{max-height:calc(min(80vh,44rem) - 5rem);font-family:var(--font-mono,monospace);white-space:pre-wrap;color:var(--text-secondary);margin:0;padding:1.15rem;font-size:.8125rem;line-height:1.65;overflow:auto}.course-prose .course-tweet{margin-top:1.75rem}.course-prose .course-tweet-frame{border-radius:var(--radius-md,.75rem);background:var(--bg-deep);--lightningcss-light: ;--lightningcss-dark:initial;color-scheme:dark;border:0;width:100%;max-width:550px;overflow:hidden}.course-prose .course-tweet-cite{color:var(--text-tertiary);margin-top:.5rem;font-size:.8125rem;line-height:1.55}.course-prose .course-tweet-cite a{color:var(--course-accent,var(--accent-orange))}.course-prose .course-shot{border:1px solid var(--border-default);border-radius:var(--radius-md,.75rem);background:var(--bg-deep);margin-top:1.75rem;overflow:hidden}.course-prose .course-shot img{width:100%;height:auto;display:block}.course-prose .course-shot-trigger{cursor:zoom-in;background:0 0;border:0;width:100%;padding:0;display:block;position:relative}.course-prose .course-shot-zoom{color:#fff;letter-spacing:.04em;opacity:0;pointer-events:none;background:#000000b8;border-radius:.375rem;padding:.25rem .55rem;font-size:.6875rem;transition:opacity .15s;position:absolute;bottom:.6rem;right:.6rem}.course-prose .course-shot-trigger:hover .course-shot-zoom,.course-prose .course-shot-trigger:focus-visible .course-shot-zoom{opacity:1}.course-shot-dialog{border:1px solid var(--border-default);border-radius:var(--radius-md,.75rem);background:var(--bg-deep);flex-direction:column;width:98vw;max-width:98vw;height:96vh;max-height:96vh;padding:0;overflow:hidden}.course-shot-dialog[open]{display:flex}.course-shot-dialog::backdrop{background:#000000e0}.course-shot-bar{border-bottom:1px solid var(--border-subtle);color:var(--text-tertiary);flex-shrink:0;align-items:center;gap:1rem;padding:.5rem .75rem;font-size:.8125rem;display:flex}.course-shot-hint{margin-right:auto}.course-shot-bar a{color:var(--course-accent,var(--accent-orange))}.course-shot-bar button{color:var(--text-secondary);cursor:pointer;border-radius:.375rem;padding:.15rem .5rem}.course-shot-bar button:hover{color:var(--text-primary)}.course-shot-scroll{flex:1;place-items:center;min-height:0;display:grid;overflow:hidden}.course-shot-scroll img{cursor:zoom-in;width:auto;max-width:100%;height:auto;max-height:100%;display:block}.course-shot-scroll.is-zoomed{cursor:grab;place-items:start;overflow:auto}.course-shot-scroll.is-zoomed img{cursor:zoom-out;width:auto;max-width:none;height:auto;max-height:none}.course-prose .course-shot figcaption{border-top:1px solid var(--border-subtle);color:var(--text-tertiary);padding:.75rem 1rem .9rem;font-size:.8125rem;line-height:1.55}.course-h1{letter-spacing:-.03em;color:var(--text-primary);font-size:clamp(2rem,3.6vw,2.75rem);font-weight:700;line-height:1.06}.course-h2{letter-spacing:-.018em;color:var(--text-primary);scroll-margin-top:6.5rem;font-size:1.875rem;font-weight:700;line-height:1.33}.course-h3{letter-spacing:-.012em;color:var(--text-primary);scroll-margin-top:6.5rem;font-size:1.3125rem;font-weight:600;line-height:1.4}.course-meta{color:var(--text-muted);flex-wrap:wrap;align-items:center;gap:.5rem;font-size:.9375rem;display:flex}.course-meta-num{border:1px solid var(--border-subtle);font-family:var(--font-mono);color:var(--course-accent);border-radius:.5rem;padding:.1rem .4rem;font-size:.6875rem}.course-deck{color:color-mix(in srgb, var(--text-primary) 60%, transparent);font-size:1.3125rem;line-height:1.55}.course-lead{color:var(--text-primary);font-size:1.09375rem;line-height:1.68}.course-p,.course-list{color:var(--text-secondary);font-size:1.09375rem;line-height:1.68}.course-list>li+li{margin-top:.55em}.course-bullet-mark{font-family:var(--font-mono);color:var(--course-accent);line-height:inherit;flex-shrink:0}.course-em{color:var(--text-primary);letter-spacing:-.004em;font-weight:600}.course-code{font-family:var(--font-mono);border:1px solid var(--border-subtle);color:var(--text-primary);white-space:nowrap;background:#ffffff0e;border-radius:4px;padding:.18em .42em;font-size:.875em;line-height:1}.course-term{border-bottom:1px dotted color-mix(in srgb, var(--course-accent) 55%, transparent);white-space:nowrap}.course-term-chip{vertical-align:.06em;width:1.05rem;height:1.05rem;color:var(--course-accent);font-family:var(--font-mono);cursor:help;transition:background var(--duration-fast) var(--ease-smooth);background:#ffffff0f;border-radius:999px;justify-content:center;align-items:center;margin-left:.22rem;font-size:.6875rem;font-weight:700;line-height:1;display:inline-flex}.course-term-chip:hover{background:color-mix(in srgb, var(--course-accent) 32%, transparent)}.course-privacy-chip-wrap{position:relative}.course-privacy-chip{border:1px solid color-mix(in srgb, var(--accent-warning) 35%, transparent);background:color-mix(in srgb, var(--accent-warning) 12%, transparent);width:1.15rem;height:1.15rem;color:var(--accent-warning);font-family:var(--font-mono);cursor:help;transition:transform var(--duration-fast) var(--ease-smooth), background var(--duration-fast) var(--ease-smooth), border-color var(--duration-fast) var(--ease-smooth);border-radius:999px;justify-content:center;align-items:center;margin-left:.25rem;font-size:.72rem;font-weight:700;line-height:1;display:inline-flex}.course-privacy-chip:hover,.course-privacy-chip:focus-visible{background:color-mix(in srgb, var(--accent-warning) 22%, transparent);border-color:color-mix(in srgb, var(--accent-warning) 62%, transparent);outline:none;transform:translateY(-1px)}.course-privacy-chip-tooltip{pointer-events:none;z-index:30;border:1px solid color-mix(in srgb, var(--accent-warning) 32%, transparent);background:color-mix(in srgb, var(--bg-surface) 96%, transparent);width:min(18rem,72vw);color:var(--text-secondary);opacity:0;transition:opacity var(--duration-fast) var(--ease-smooth), transform var(--duration-fast) var(--ease-smooth);border-radius:.8rem;padding:.7rem .85rem;font-size:.75rem;line-height:1.5;position:absolute;top:calc(100% + .6rem);left:50%;transform:translate(-50%)translateY(.25rem);box-shadow:0 16px 40px #0000005c}.course-privacy-chip-wrap:hover .course-privacy-chip-tooltip,.course-privacy-chip-wrap:focus-within .course-privacy-chip-tooltip{opacity:1;transform:translate(-50%)translateY(0)}.course-code-block{border:1px solid var(--border-subtle);background:var(--bg-card);border-radius:.75rem;margin:1.5rem 0;overflow:hidden}.course-code-head{border-bottom:1px solid var(--border-subtle);justify-content:space-between;align-items:center;gap:1rem;padding:.5rem .75rem .5rem 1rem;display:flex}.course-code-label{font-family:var(--font-mono);letter-spacing:.14em;text-transform:uppercase;color:var(--text-muted);font-size:.6875rem;font-weight:600}.course-copy{border:1px solid var(--border-subtle);background:var(--surface-card);color:var(--text-secondary);cursor:pointer;transition:color var(--duration-fast) var(--ease-smooth), border-color var(--duration-fast) var(--ease-smooth);border-radius:.5rem;flex-shrink:0;padding:.25rem .6rem;font-size:.78125rem;font-weight:500}.course-copy:hover{color:var(--course-accent);border-color:color-mix(in srgb, var(--course-accent) 45%, var(--border-default))}.course-copy[data-state=copied]{color:var(--accent-green);border-color:color-mix(in srgb, var(--accent-green) 45%, var(--border-default))}.course-copy[data-state=failed]{color:var(--accent-red)}.course-code-pre{font-family:var(--font-mono);color:var(--text-primary);white-space:pre;margin:0;padding:.9rem 1rem;font-size:.875rem;line-height:1.6;overflow-x:auto}.course-code-pre[data-prompt]:before{content:"$ ";-webkit-user-select:none;user-select:none;color:var(--text-disabled)}.course-code-pre[data-prompt=ps]:before{content:"> "}.course-code-note{border-top:1px solid var(--border-subtle);color:var(--text-tertiary);padding:.6rem 1rem .75rem;font-size:.78125rem;line-height:1.5}.course-link{color:var(--course-accent);text-decoration:underline;-webkit-text-decoration-color:color-mix(in srgb, var(--course-accent) 40%, transparent);text-decoration-color:color-mix(in srgb, var(--course-accent) 40%, transparent);text-underline-offset:3px;transition:text-decoration-color var(--duration-fast) var(--ease-smooth);font-weight:500;text-decoration-thickness:1px}.course-link:hover{-webkit-text-decoration-color:var(--course-accent);text-decoration-color:var(--course-accent)}.course-table-wrap{border:1px solid var(--border-subtle);background:var(--bg-surface);border-radius:.75rem;overflow:hidden}.course-table{border-collapse:collapse;width:100%;font-size:.9375rem}.course-table thead tr{background:var(--bg-elevated)}.course-table th{color:var(--text-primary);text-align:left;letter-spacing:-.008em;border-bottom:1px solid var(--border-default);padding:.85rem 1.15rem;font-weight:600}.course-table td{vertical-align:top;color:var(--text-secondary);border-bottom:1px solid var(--border-subtle);padding:.9rem 1.15rem;line-height:1.6}.course-table tbody tr:last-child td{border-bottom:0}.course-table tbody tr:nth-child(2n){background:color-mix(in srgb, var(--surface-card) 55%, transparent)}.course-table tbody tr:hover{background:var(--surface-card-hover)}.course-table td:first-child{color:var(--text-primary);font-weight:600}.course-check-item{text-align:left;border:1px solid var(--border-subtle);background:var(--surface-card);cursor:pointer;width:100%;transition:border-color var(--duration-fast) var(--ease-smooth), background var(--duration-fast) var(--ease-smooth);border-radius:.5rem;align-items:flex-start;gap:.7rem;padding:.7rem .85rem;display:flex}.course-check-item:hover{border-color:color-mix(in srgb, var(--course-accent) 45%, var(--border-default));background:var(--bg-elevated)}.course-check-item:focus-visible{outline:2px solid var(--course-accent);outline-offset:2px}.course-check-item.is-on{border-color:var(--border-subtle);background:0 0}.course-check-box{border:1.5px solid var(--text-muted);border-radius:.5rem;justify-content:center;align-items:center;width:1.25rem;height:1.25rem;margin-top:.1rem;font-size:.6875rem;line-height:1;display:inline-flex}.course-check-item--step .course-check-box{width:1.6rem;height:1.6rem;font-family:var(--font-mono);letter-spacing:.02em;border-radius:.5rem;font-size:.6875rem}.course-step-head{font-family:var(--font-mono);letter-spacing:.08em;text-transform:uppercase;color:var(--text-muted);justify-content:space-between;margin-bottom:.5rem;font-size:.6875rem;display:flex}.course-steps{gap:.5rem;display:grid}.course-step{border:1px solid var(--border-subtle);background:var(--surface-card);border-radius:.6rem;align-items:flex-start;gap:.75rem;padding:.7rem .85rem;display:flex}.course-step.is-on{background:0 0}.course-step-toggle{cursor:pointer;background:0 0;border:0;padding:0;line-height:0}.course-step-toggle:focus-visible{outline:2px solid var(--course-accent);outline-offset:2px;border-radius:.45rem}.course-step-toggle .course-check-box{width:1.6rem;height:1.6rem;font-family:var(--font-mono);letter-spacing:.02em;border-radius:.45rem;font-size:.6875rem}.course-step-body{flex:1;min-width:0}.course-step-title{color:var(--text-secondary);padding-top:.2rem;font-size:.9375rem;line-height:1.55}.course-step-title.is-on{color:var(--text-tertiary)}.course-step-code .course-code-block{margin:.6rem 0 0}.course-step-note{color:var(--text-tertiary);margin-top:.4rem;font-size:.78125rem}.course-progress{flex-direction:column;gap:.4rem;display:flex}.course-progress-track{background:color-mix(in srgb, var(--text-primary) 8%, transparent);border-radius:2px;height:4px;overflow:hidden}.course-progress-fill{height:100%;transition:width var(--duration-slow) var(--ease-out-expo);border-radius:2px}.course-complete-btn{border:1px solid color-mix(in srgb, var(--course-accent) 38%, var(--border-default));background:var(--course-accent-wash);color:var(--text-primary);cursor:pointer;transition:border-color var(--duration-fast) var(--ease-smooth), background var(--duration-fast) var(--ease-smooth);border-radius:.5rem;align-items:center;gap:.5rem;padding:.55rem 1rem;font-size:.9375rem;font-weight:500;display:inline-flex}.course-complete-btn:hover{border-color:var(--course-accent);background:color-mix(in srgb, var(--course-accent) 14%, transparent)}.course-complete-btn.is-done{border-color:color-mix(in srgb, var(--accent-green) 45%, var(--border-default));background:color-mix(in srgb, var(--accent-green) 10%, transparent);color:var(--accent-green)}.course-ghost-btn{color:var(--text-muted);font-family:var(--font-mono);letter-spacing:.06em;cursor:pointer;transition:color var(--duration-fast) var(--ease-smooth), border-color var(--duration-fast) var(--ease-smooth);background:0 0;border:1px solid #0000;border-radius:.5rem;padding:.2rem .5rem;font-size:.6875rem}.course-ghost-btn:hover{color:var(--text-secondary);border-color:var(--border-subtle)}.course-segmented{border:1px solid var(--border-subtle);background:var(--surface-card);border-radius:.5rem;gap:2px;padding:3px;display:inline-flex}.course-segmented-item{color:var(--text-tertiary);transition:color var(--duration-fast) var(--ease-smooth), background var(--duration-fast) var(--ease-smooth);border-radius:.5rem;padding:.32rem .7rem;font-size:.6875rem}.course-segmented-item:hover{color:var(--text-primary)}.course-segmented-item[aria-current=page],.course-segmented-item.is-on{background:var(--course-accent-wash);color:var(--course-accent)}.course-privacy-chip{border:1px solid var(--border-subtle);background:var(--surface-card);font-family:var(--font-mono);letter-spacing:.06em;color:var(--text-tertiary);border-radius:999px;align-items:center;gap:.35rem;padding:.2rem .55rem;font-size:.6875rem;display:inline-flex}.course-hero{padding-bottom:.5rem;position:relative}.course-proof{border-top:1px solid var(--border-subtle);padding-top:2rem}.course-callout{border:1px solid var(--border-subtle);background:var(--surface-card);border-radius:.75rem;padding:1rem 1.15rem;position:relative;overflow:hidden}.course-callout:before{content:"";background:var(--course-accent);width:2px;position:absolute;inset:0 auto 0 0}.course-callout--warn:before{background:var(--accent-warning)}.course-callout--quote{font-style:italic}.course-callout--quote:before{background:var(--accent-cyan)}.course-links{border-top:1px solid var(--border-subtle);padding-top:1.1rem}.course-links-label{font-family:var(--font-mono);letter-spacing:.16em;text-transform:uppercase;color:var(--text-muted);margin-bottom:.5rem;font-size:.6875rem;font-weight:600}.course-links-list{gap:0;display:grid}@media (min-width:640px){.course-links-list{grid-template-columns:1fr 1fr;column-gap:2rem}}.course-links-item{color:var(--text-secondary);border-bottom:1px solid var(--border-subtle);transition:color var(--duration-fast) var(--ease-smooth);justify-content:space-between;align-items:baseline;gap:1rem;padding:.45rem 0;font-size:.9375rem;display:flex}.course-links-item:hover{color:var(--course-accent)}.course-links-arrow{color:var(--text-disabled);flex-shrink:0}.course-links-item:hover .course-links-arrow{color:var(--course-accent)}.course-refs-summary{cursor:pointer;font-family:var(--font-mono);letter-spacing:.16em;text-transform:uppercase;color:var(--text-muted);align-items:center;gap:.5rem;font-size:.6875rem;font-weight:600;list-style:none;display:flex}.course-refs-summary::-webkit-details-marker{display:none}.course-refs-summary:hover{color:var(--text-secondary)}.course-refs-body>*+*{margin-top:.75rem}.course-refs-body{margin-top:.85rem}.course-fig{border:1px solid var(--border-subtle);background:var(--surface-card);border-radius:.75rem}.course-fig--split{gap:0;display:grid}@media (min-width:768px){.course-fig--split{grid-template-columns:1fr 1fr}.course-fig-half+.course-fig-half{border-top:0;border-left:1px solid var(--border-subtle)}}.course-fig-half{padding:1.35rem 1.5rem}.course-fig-half+.course-fig-half{border-top:1px solid var(--border-subtle)}.course-fig-label{font-family:var(--font-mono);letter-spacing:.16em;text-transform:uppercase;font-size:.6875rem;font-weight:600}.course-fig-title{color:var(--text-primary);margin-top:.5rem;font-size:1.09375rem;font-weight:600}.course-fig-items{color:var(--text-secondary);flex-wrap:wrap;gap:.35rem .9rem;margin-top:.85rem;font-size:.9375rem;display:flex}.course-fig-items>li+li:before{content:"·";color:var(--text-disabled);margin-right:.9rem}.course-fig-foot{color:var(--text-muted);margin-top:.9rem;font-size:.6875rem}.course-fig-note{border-top:1px solid var(--border-subtle);color:var(--text-tertiary);grid-column:1/-1;padding:.8rem 1.5rem;font-size:.6875rem}.course-lex-term{font-family:var(--font-mono);letter-spacing:.16em;text-transform:uppercase;color:var(--course-accent);font-size:.6875rem;font-weight:600;line-height:1.35}.course-advanced-details,.course-disclose{border:1px solid var(--border-subtle);background:var(--surface-card);border-radius:.75rem;overflow:hidden}.course-advanced-summary,.course-disclose-summary{cursor:pointer;color:var(--text-primary);transition:background var(--duration-fast) var(--ease-smooth);align-items:center;gap:.6rem;padding:.85rem 1.05rem;font-weight:500;list-style:none;display:flex}.course-advanced-summary::-webkit-details-marker{display:none}.course-disclose-summary::-webkit-details-marker{display:none}.course-advanced-summary:hover,.course-disclose-summary:hover{background:var(--bg-hover)}.course-advanced-chevron{color:var(--course-accent);transition:transform var(--duration-base) var(--ease-smooth);display:inline-block}details[open]>summary .course-advanced-chevron{transform:rotate(90deg)}.course-advanced-body,.course-disclose-body{border-top:1px solid var(--border-subtle);padding:1.05rem 1.05rem 1.15rem}.course-disclose-hint{color:var(--text-tertiary);margin-left:auto;font-size:.6875rem}.course-layout{grid-template-columns:minmax(0,1fr);gap:2.5rem;display:grid}.course-layout-nav,.course-layout-rail{display:none}@media (min-width:1024px){.course-layout{grid-template-columns:15rem minmax(0,1fr);gap:3rem}.course-layout-nav{display:block}}@media (min-width:1280px){.course-layout{grid-template-columns:15rem minmax(0,1fr) 14rem}.course-layout-rail{display:block}}.course-crumbs{color:var(--text-muted);flex-wrap:wrap;align-items:center;gap:.5rem;margin-bottom:2rem;font-size:.6875rem;display:flex}.course-crumbs a{color:var(--text-muted);transition:color var(--duration-fast) var(--ease-smooth)}.course-crumbs a:hover{color:var(--text-secondary)}.course-crumbs-here{color:var(--text-tertiary)}.course-nav{font-size:.9375rem}.course-nav-progress{align-items:center;gap:.6rem;margin-bottom:1.6rem;display:flex}.course-nav-progress .course-progress-track{flex:1}.course-nav-progress-label{font-family:var(--font-mono);color:var(--text-muted);font-variant-numeric:tabular-nums;font-size:.6875rem}.course-nav-group+.course-nav-group{margin-top:1.5rem}.course-nav-group-label{color:var(--text-muted);margin-bottom:.5rem;padding-inline:.55rem;font-size:.6875rem;font-weight:600}.course-nav-item{color:var(--text-secondary);transition:color var(--duration-fast) var(--ease-smooth), background var(--duration-fast) var(--ease-smooth);border-radius:.5rem;align-items:baseline;gap:.6rem;padding:.4rem .55rem;line-height:1.4;display:flex}.course-nav-item:hover{background:var(--bg-hover);color:var(--text-primary)}.course-nav-item.is-active{background:var(--bg-elevated);color:var(--text-primary);font-weight:500}.course-nav-num{width:1.25rem;font-family:var(--font-mono);color:var(--text-muted);font-variant-numeric:tabular-nums;flex-shrink:0;font-size:.6875rem}.course-nav-item.is-active .course-nav-num,.course-nav-item.is-done .course-nav-num{color:var(--course-accent)}.course-nav-item.is-done>span:last-child{color:var(--text-tertiary)}.course-nav-cards{gap:.75rem;display:grid}@media (min-width:640px){.course-nav-cards{grid-template-columns:1fr 1fr}}.course-nav-card{border:1px solid var(--border-subtle);background:var(--surface-card);transition:border-color var(--duration-base) var(--ease-smooth), background var(--duration-base) var(--ease-smooth);border-radius:.75rem;flex-direction:column;gap:.3rem;padding:.95rem 1.1rem;display:flex}.course-nav-card:hover{border-color:color-mix(in srgb, var(--course-accent) 50%, var(--border-default));background:var(--bg-elevated)}.course-nav-card-dir{font-family:var(--font-mono);letter-spacing:.13em;text-transform:uppercase;color:var(--text-muted);font-size:.6875rem;font-weight:600}.course-nav-card-title{color:var(--text-primary);font-size:.9375rem;font-weight:500;line-height:1.35}.course-nav-card--next{text-align:right;border-color:color-mix(in srgb, var(--course-accent) 30%, var(--border-default))}.course-nav-card--next .course-nav-card-title{color:var(--course-accent)}.course-rail-nav{border-left:1px solid var(--border-subtle);max-height:calc(100vh - 8rem);padding-left:1.25rem;font-size:.6875rem;position:sticky;top:6rem;overflow-y:auto}.course-rail-title{color:var(--text-muted);margin-bottom:.7rem;font-size:.6875rem;font-weight:600}.course-rail-link{color:var(--text-tertiary);transition:color var(--duration-fast) var(--ease-smooth);padding:.28rem 0;line-height:1.4;display:block}.course-rail-link:hover{color:var(--text-primary)}.course-rail-link.is-active{color:var(--course-accent)}.course-toc{border-radius:.75rem}.course-toc--scroll{scrollbar-width:thin;scrollbar-color:var(--border-default) transparent}.course-toc--scroll::-webkit-scrollbar{width:6px}.course-toc--scroll::-webkit-scrollbar-thumb{background:var(--border-default);border-radius:3px}.course-mobile-toc-wrap{margin-top:2rem}.course-lex-card{scroll-margin-top:6.5rem}.course-who-steps{gap:.5rem;display:grid}.course-who-step{border:1px solid var(--border-default);background:var(--surface-card);border-radius:.75rem;grid-template-columns:6.5rem 1fr;align-items:start;gap:.75rem;padding:.75rem .9rem;display:grid}.course-who-label{font-family:var(--font-mono);letter-spacing:.08em;text-transform:uppercase;color:var(--course-accent);padding-top:.15rem;font-size:.6875rem;line-height:1.35}.course-who-body{min-width:0}.course-remember,.course-win-when{border:1px solid var(--border-default);border-left:2px solid var(--course-accent);background:var(--surface-card);border-radius:.75rem;padding:.85rem 1rem}.course-primary-sources{border:1px solid var(--border-default);background:var(--bg-surface);border-radius:.75rem;padding:.85rem 1rem}.course-citations{margin:0}.course-quiz{border:1px solid var(--border-subtle);background:var(--surface-card);border-radius:.75rem;padding:1.15rem 1.25rem;position:relative;overflow:hidden}.course-quiz:before{content:"";background:var(--course-accent);width:2px;position:absolute;inset:0 auto 0 0}.course-quiz-tag{font-family:var(--font-mono);letter-spacing:.13em;text-transform:uppercase;color:var(--course-accent);align-items:center;gap:.45rem;margin-bottom:.7rem;font-size:.6875rem;font-weight:600;display:flex}.course-quiz-tag-mark{background:color-mix(in srgb, var(--course-accent) 18%, transparent);border-radius:999px;justify-content:center;align-items:center;width:1.15rem;height:1.15rem;font-size:.6875rem;line-height:1;display:inline-flex}.course-quiz-question{color:var(--text-primary);font-size:.9375rem;font-weight:500;line-height:1.45}.course-quiz-hint{color:var(--text-tertiary);margin-top:.3rem;margin-bottom:.9rem;font-size:.6875rem}.course-quiz-opt{text-align:left;border:1px solid var(--border-default);background:var(--bg-deep);width:100%;color:var(--text-secondary);font:inherit;cursor:pointer;border-radius:.5rem;padding:.65rem .8rem;font-size:.9375rem;transition:border-color .15s,color .15s;display:block}.course-quiz-opt:hover:not(:disabled){border-color:var(--course-accent);color:var(--text-primary)}.course-quiz-opt:disabled{cursor:default}.course-quiz-opt.is-correct{border-color:var(--accent-green);color:var(--accent-green)}.course-quiz-opt.is-wrong{color:#ef8b8b;border-color:#ef8b8b}.course-quiz-opt.is-dim{opacity:.55}@media (max-width:480px){.course-who-step{grid-template-columns:1fr;gap:.35rem}.course-h2{font-size:1.3125rem}}}