:root{--nisi-yellow:#f7b400;--nisi-yellow-soft:#fce4a4;--nisi-yellow-050:#fdf6e3;--nisi-yellow-deep:#7e5c00;--wine:#863e46;--wine-deep:#6b3238;--wine-strong:#85000a;--ink:#45423b;--ink-heading:#535353;--ink-muted:#5f5b50;--ink-faint:#898477;--ink-inverse:#f7f7f7;--surface:#ffffff;--surface-page:#f7f7f7;--surface-sunken:#ededed;--surface-muted:#e6e6e6;--surface-dark:#454545;--border:#dcdcdc;--border-strong:#898477;--focus-ring:#45423b;--success:#74b500;--success-strong:#5a8a00;--success-soft:#f3f8e8;--danger:#dc3545;--wine-soft:#fbf1f2;--border-dark:#5a5750;--surface-black:#000000;--lume:#d7f23c;--on-yellow:#45423b;--on-wine:#f7f7f7;--success-text:#4a7300;--mark:#fce4a4;--lightbox:#0e0e0d;--on-lightbox:#f3f1ec;--on-lightbox-muted:#b4afa3;--product-plate:#ffffff;--scrim:rgba(28,27,25,0.55);--font-sans:Inter, Helvetica, Arial, sans-serif;--font-mono:"IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, monospace;--fs-display:44px;--lh-display:50px;--fw-display:700;--fs-h1:32px;--lh-h1:38px;--fw-h1:700;--fs-h1-m:28px;--lh-h1-m:34px;--fw-h1-m:700;--fs-h2:26px;--lh-h2:32px;--fw-h2:700;--fs-h2-m:20px;--lh-h2-m:26px;--fw-h2-m:700;--fs-h3:20px;--lh-h3:26px;--fw-h3:700;--fs-h3-m:17px;--lh-h3-m:23px;--fw-h3-m:700;--fs-title-card:16px;--lh-title-card:22px;--fw-title-card:600;--fs-lead:18px;--lh-lead:29px;--fw-lead:400;--fs-lead-m:16px;--lh-lead-m:25px;--fw-lead-m:400;--fs-body:16px;--lh-body:24px;--fw-body:400;--fs-body-s:15px;--lh-body-s:22px;--fw-body-s:400;--fs-small:14px;--lh-small:20px;--fw-small:400;--fs-caption:13px;--lh-caption:18px;--fw-caption:400;--fs-micro:12px;--lh-micro:16px;--fw-micro:400;--fs-button-primary:15px;--lh-button-primary:18px;--fw-button-primary:600;--ls-button-primary:0.04em;--fs-button:15px;--lh-button:20px;--fw-button:600;--fs-chip:14px;--lh-chip:20px;--fw-chip:400;--fs-chip-s:13px;--lh-chip-s:18px;--fw-chip-s:400;--fs-pill:13px;--lh-pill:18px;--fw-pill:600;--fs-label:12px;--lh-label:16px;--fw-label:700;--ls-label:0.06em;--fs-price:16px;--lh-price:22px;--fw-price:700;--fs-price-l:22px;--lh-price-l:28px;--fw-price-l:700;--fs-price-xl:32px;--lh-price-xl:38px;--fw-price-xl:700;--fs-price-xl-m:26px;--lh-price-xl-m:32px;--fw-price-xl-m:700;--fs-sku:12px;--lh-sku:17px;--fw-sku:400;--fs-code:13px;--lh-code:18px;--fw-code:400;--fs-rank:12px;--lh-rank:16px;--fw-rank:600;--fs-stat:34px;--lh-stat:40px;--fw-stat:600;--fs-stat-m:26px;--lh-stat-m:32px;--fw-stat-m:600;--fs-chapter-h1:40px;--lh-chapter-h1:48px;--fw-chapter-h1:700;--fs-chapter-h1-m:28px;--lh-chapter-h1-m:34px;--fw-chapter-h1-m:700;--fs-chapter-lead:20px;--lh-chapter-lead:32px;--fw-chapter-lead:400;--fs-chapter-lead-m:17px;--lh-chapter-lead-m:27px;--fw-chapter-lead-m:400;--fs-reading:18px;--lh-reading:30px;--fw-reading:400;--fs-reading-m:16px;--lh-reading-m:26px;--fw-reading-m:400;--fs-chapter-h2:28px;--lh-chapter-h2:34px;--fw-chapter-h2:700;--fs-chapter-h2-m:21px;--lh-chapter-h2-m:27px;--fw-chapter-h2-m:700;--fs-note-text:17px;--lh-note-text:28px;--fw-note-text:400;--fs-callout-text:16px;--lh-callout-text:25px;--fw-callout-text:400;--fs-callout-text-m:15px;--lh-callout-text-m:23px;--fw-callout-text-m:400;--fs-row-title:17px;--lh-row-title:23px;--fw-row-title:700;--fs-row-title-m:16px;--lh-row-title-m:22px;--fw-row-title-m:700;--fs-tree-item:15px;--lh-tree-item:20px;--fw-tree-item:400;--fs-chapter-num:14px;--lh-chapter-num:20px;--fw-chapter-num:400;--fs-byline:12px;--lh-byline:17px;--fw-byline:400;--fs-exif:12px;--lh-exif:16px;--fw-exif:400;--fs-formula:24px;--lh-formula:31px;--fw-formula:600;--fs-formula-m:17px;--lh-formula-m:22px;--fw-formula-m:600;--fs-stepper-value:34px;--lh-stepper-value:34px;--fw-stepper-value:600;--space-1:4px;--space-2:8px;--space-3:12px;--space-4:16px;--space-5:20px;--space-6:24px;--space-7:28px;--space-8:32px;--space-10:40px;--space-12:48px;--space-14:56px;--space-16:64px;--space-20:80px;--radius-none:0;--radius-sm:4px;--radius-md:6px;--radius-lg:8px;--radius-xl:16px;--radius-pill:999px;--container-max:1280px;--gutter-mobile:16px;--grid-gap-mobile:12px;--grid-gap-desktop:16px;--control-sm:36px;--control-md:44px;--control-row:48px;--control-lg:52px;--control-xl:64px;--card-image-ratio:4 / 3;--hero-strip-mobile:120px;--hero-strip-desktop:240px;--strip-section-mobile:110px;--strip-section-desktop:200px;--header-bar:36px;--header-desktop:72px;--header-mobile:56px;--academy-header-desktop:64px;--academy-header-mobile:56px;--academy-search:440px;--reading-column:800px;--info-column:960px;--mega-feature:296px;--campaign-image:16 / 9;--reading-measure:656px;--tree-column:264px;--toc-column:280px;--reading-gap:40px;--chapter-bar:44px;--tree-row:40px;--tree-panel:400px;--sheet-max:86%;--progress-bar:6px;--portrait-note:48px;--step-dot:32px;--hotspot:36px;--unlock-bar:64px;--photo-page-max:1600px;--photo-original:2600px;--zoom-threshold:90%;--bp-sm:576px;--bp-md:768px;--bp-lg:992px;--bp-xl:1200px;--bp-xxl:1400px;--shadow-card:0 1px 2px rgba(69,66,59,0.08), 0 4px 12px rgba(69,66,59,0.10);--shadow-overlay:0 8px 32px rgba(69,66,59,0.22)}[data-theme="dark"]{--nisi-yellow-050:#3d3626;--nisi-yellow-deep:#e2a846;--wine:#e0aaaf;--wine-deep:#efc0c5;--wine-strong:#ff948b;--ink:#f7f7f7;--ink-heading:#f7f7f7;--ink-muted:#c6c2b6;--ink-faint:#98938a;--surface:#3a3a3a;--surface-page:#454545;--surface-sunken:#2e2e2e;--surface-muted:#3f3f3f;--surface-dark:#2a2a2a;--border:#5a5a5a;--border-strong:#949088;--focus-ring:#f7b400;--success:#8fd21f;--success-strong:#a3e04a;--success-soft:#26311a;--danger:#ff8a80;--wine-soft:#3a2226;--on-yellow:#1c1b19;--on-wine:#1c1b19;--success-text:#b6e37a;--mark:#6a5418;--scrim:rgba(0,0,0,0.62);--shadow-card:0 1px 2px rgba(0,0,0,0.6), 0 4px 12px rgba(0,0,0,0.5);--shadow-overlay:0 8px 32px rgba(0,0,0,0.7)}