@layer theme,base,components,utilities;:root{--color-cream-50: #fdfbf7;--color-cream-100: #f7f3ec;--color-white-warm: #fffefa;--color-brown-900: #2c2220;--color-brown-700: #4a3b38;--color-brown-500: #7a6b66;--color-brown-400: #9a8a86;--color-brown-rgb: 44, 34, 32;--color-gold-500: #fec107;--color-gold-600: #e5ac00;--color-gold-650: #f5a623;--color-gold-rgb: 254, 193, 7;--color-info-500: #2563eb;--color-info-rgb: 37, 99, 235;--color-success-500: #10b981;--color-error-500: #ef4444;--surface-canvas: var(--color-cream-50);--surface-subtle: var(--color-cream-100);--surface-card: var(--color-white-warm);--surface-inverse: var(--color-brown-900);--text-primary: var(--color-brown-900);--text-secondary: var(--color-brown-700);--text-tertiary: var(--color-brown-500);--text-muted: var(--color-brown-400);--text-on-inverse: var(--color-cream-50);--text-on-inverse-muted: rgba(253, 251, 247, .65);--border-default: rgba(var(--color-brown-rgb), .1);--border-muted: rgba(var(--color-brown-rgb), .14);--ambient-network-rgb: 154, 138, 134;--action-primary-bg: var(--color-gold-500);--action-primary-bg-hover: var(--color-gold-600);--action-primary-rgb: 254, 193, 7;--action-primary-gradient-from: var(--color-gold-500);--action-primary-gradient-to: var(--color-gold-650);--action-primary-surface: #fef3cd;--action-primary-border: rgba(var(--color-gold-rgb), .38);--action-primary-text: var(--color-brown-900);--status-info: var(--color-info-500);--status-info-rgb: 37, 99, 235;--status-info-surface: rgba(var(--color-info-rgb), .08);--status-info-border: rgba(var(--color-info-rgb), .22);--status-info-text: #1e3a8a;--status-success: var(--color-success-500);--status-success-surface: #ecfdf5;--status-success-border: #a7f3d0;--status-success-text: #064e3b;--status-error: var(--color-error-500);--status-error-surface: #fef2f2;--status-error-border: #fecaca;--status-error-text: #7f1d1d;--font-body: "Source Sans 3", system-ui, sans-serif;--font-display: "DM Serif Display", Georgia, serif;--type-weight-normal: 400;--type-weight-medium: 500;--type-weight-semibold: 600;--type-weight-bold: 700;--type-size-xs: .75rem;--type-size-sm: .875rem;--type-size-base: 1rem;--type-size-lg: 1.125rem;--type-size-xl: 1.25rem;--type-size-2xl: 1.5rem;--type-size-3xl: 1.875rem;--type-size-4xl: 2.25rem;--type-size-5xl: 3rem;--space-1: .25rem;--space-2: .5rem;--space-3: .75rem;--space-4: 1rem;--space-6: 1.5rem;--space-8: 2rem;--space-10: 2.5rem;--space-12: 3rem;--space-16: 4rem;--space-24: 6rem;--space-28: 7rem;--radius-sm: .375rem;--radius-md: .5rem;--radius-lg: .75rem;--radius-xl: 1rem;--radius-card: 1.25rem;--radius-pill: 9999px;--elevation-sm: 0 1px 2px 0 rgba(var(--color-brown-rgb), .05);--elevation-md: 0 8px 24px rgba(var(--color-brown-rgb), .08), 0 2px 8px rgba(var(--color-brown-rgb), .06);--elevation-lg: 0 24px 48px rgba(var(--color-brown-rgb), .12), 0 8px 16px rgba(var(--color-brown-rgb), .08);--elevation-action: 0 6px 20px rgba(var(--action-primary-rgb), .35);--easing-out: cubic-bezier(.16, 1, .3, 1);--easing-spring: cubic-bezier(.34, 1.56, .64, 1);--easing-inout: cubic-bezier(.4, 0, .2, 1);--dur-100: .12s;--dur-200: .18s;--dur-300: .24s;--dur-reveal: .7s;--easing-reveal: ease-out;--scrollbar-size: .5rem;--scrollbar-thumb-color: rgba(var(--color-brown-rgb), .16);--scrollbar-radius: var(--radius-lg);--skeleton-surface: rgba(var(--color-brown-rgb), .06);--skeleton-shine: rgba(255, 255, 255, .55);--touch-target: 2.75rem;--segmented-phone-cell-width: clamp(1.125rem, 4vw, 1.75rem);--interactive-control-track-height: 4px;--interactive-control-thumb-size: 18px;--interactive-toggle-width: 48px;--interactive-toggle-height: 26px;--interactive-toggle-inset: 2px;--interactive-toggle-knob: 22px;--interactive-toggle-travel: 22px;--overlay-sheet-width-standard: 720px;--content-measure: 68ch;--content-gutter-min: var(--space-4);--content-gutter-fluid: 3vw;--content-gutter-max: var(--space-6);--content-padding-block-mobile: var(--space-4);--content-padding-block-desktop: var(--space-4);--content-figure-margin-y: var(--space-3);--z-base: 0;--z-content: 10;--z-overlay: 20;--z-chrome: 40;--z-modal: 50}@layer base{input,select,textarea,button{box-sizing:border-box}}@layer components{.action-primary{background:linear-gradient(135deg,var(--action-primary-gradient-from),var(--action-primary-gradient-to));color:var(--action-primary-text);box-shadow:var(--elevation-action)}.action-primary:hover{background:var(--action-primary-bg-hover)}.action-default{background:color-mix(in srgb,var(--surface-card) 88%,transparent);color:var(--text-primary);border:1px solid var(--border-default)}.action-default:hover{background:var(--surface-card)}.action-header-active{background:var(--text-primary);color:var(--surface-card);border:1px solid var(--text-primary);border-radius:var(--radius-pill)}.action-header-inactive{background:color-mix(in srgb,var(--surface-card) 70%,transparent);color:var(--text-tertiary);border:1px solid transparent;border-radius:var(--radius-pill)}.action-header-inactive:hover{background:var(--surface-card)}}@keyframes shimmer{0%{background-position:200% 0}to{background-position:-200% 0}}:root{font-family:var(--font-body);line-height:1.5;font-weight:400}*::-webkit-scrollbar{width:var(--scrollbar-size);height:var(--scrollbar-size)}*::-webkit-scrollbar-thumb{background-color:var(--scrollbar-thumb-color);border-radius:var(--scrollbar-radius)}*::-webkit-scrollbar-track{background:transparent}.hide-scrollbar{scrollbar-width:none}.hide-scrollbar::-webkit-scrollbar{display:none}.skeleton{background:linear-gradient(90deg,var(--skeleton-surface) 0%,var(--skeleton-shine) 50%,var(--skeleton-surface) 100%);background-size:200% 100%;border-radius:var(--radius-lg);animation:shimmer 1.5s infinite}@layer utilities{.fade-mask-bottom{-webkit-mask-image:linear-gradient(to bottom,black 0%,black var(--fade-mask-solid-stop, 78%),transparent var(--fade-mask-clear-stop, 100%));mask-image:linear-gradient(to bottom,black 0%,black var(--fade-mask-solid-stop, 78%),transparent var(--fade-mask-clear-stop, 100%))}}@layer components{.lesson-doc{--content-gutter: clamp( var(--content-gutter-min), var(--content-gutter-fluid), var(--content-gutter-max) );--content-width: min( var(--content-measure), max(0px, calc(100% - (2 * var(--content-gutter)))) );display:grid;grid-template-columns:[full-start] minmax(0,1fr) [content-start] var(--content-width) [content-end] minmax(0,1fr) [full-end];padding-block:var(--content-padding-block-mobile)}@media(min-width:768px){.lesson-doc{padding-block:var(--content-padding-block-desktop)}}.lesson-doc>*{grid-column:content-start / content-end}.lesson-doc>.lesson-figure--full{grid-column:full-start / full-end;margin-block:var(--content-figure-margin-y)}.lesson-doc>.lesson-figure--full>.lesson-figure__image,.lesson-doc>.lesson-figure--full>.lesson-figure__interactive{display:block;width:100%;height:auto}.lesson-doc>.lesson-figure--full>.lesson-figure__interactive{border:none}.lesson-doc>.lesson-figure--full>.lesson-figure__caption{padding:var(--space-2) var(--content-gutter) 0;font-size:var(--type-size-xs);color:var(--text-tertiary);text-align:left;font-weight:400;line-height:1.5}}body{margin:0;background:var(--surface-canvas);color:var(--text-primary);font-family:var(--font-body)}.hero-fold{position:relative;width:100dvw;height:100dvh;overflow:hidden}[data-animate]{opacity:0}[data-reveal-child]{opacity:0;transform:translateY(24px);transition:opacity var(--dur-reveal) var(--easing-reveal),transform var(--dur-reveal) var(--easing-reveal)}[data-reveal-child=scale]{transform:scale(.96)}[data-reveal-child=slide-left]{transform:translate(-20px)}[data-reveal-child].revealed{opacity:1;transform:translateY(0) scale(1) translate(0)}