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Sans Flex", "Google Sans", "Roboto Flex", system-ui, sans-serif;--md-shape-xs:4px;--md-shape-sm:8px;--md-shape-md:12px;--md-shape-lg:16px;--md-shape-lg-inc:20px;--md-shape-xl:28px;--md-shape-xl-inc:32px;--md-shape-2xl:48px;--md-shape-full:999px;--md-spring-fast:.35s cubic-bezier(.42, 1.67, .21, .9);--md-spring:.5s cubic-bezier(.38, 1.21, .22, 1);--md-effect-fast:.15s cubic-bezier(.31, .94, .34, 1);--md-effect:.2s cubic-bezier(.34, .8, .34, 1);--md-elev-1:0 1px 2px #0000002e, 0 1px 3px 1px #00000014;--md-elev-2:0 1px 2px #0000002e, 0 2px 6px 2px #0000001a;--md-elev-3:0 4px 8px 3px #0000001a, 0 1px 3px #0000002e;--kh-rail:96px;--kh-gutter:16px;--kh-max:1240px}@media (prefers-reduced-motion:reduce){:root{--md-spring-fast:1ms linear;--md-spring:1ms linear;--md-effect-fast:1ms linear;--md-effect:1ms linear}}*,:before,:after{box-sizing:border-box}html{-webkit-text-size-adjust:100%;scroll-padding-top:88px}body{font-family:var(--kh-font);font-variation-settings:"ROND" 40, "GRAD" 0;background:var(--md-sys-color-surface);color:var(--md-sys-color-on-surface);-webkit-font-smoothing:antialiased;text-rendering:optimizelegibility;margin:0;font-size:16px;line-height:24px}img{max-width:100%;display:block}a{color:inherit}button{font:inherit;color:inherit}:focus-visible{outline:3px solid var(--md-sys-color-tertiary-fixed-dim);outline-offset:2px;border-radius:var(--md-shape-sm)}::selection{background:var(--md-sys-color-tertiary-fixed);color:var(--md-sys-color-on-tertiary-fixed)}.visually-hidden{clip:rect(0 0 0 0);white-space:nowrap;width:1px;height:1px;overflow:hidden;position:absolute!important}.display-l{letter-spacing:-.02em;font-variation-settings:"ROND" 100, "opsz" 144;font-size:clamp(44px,7vw,88px);font-weight:720;font-stretch:112%;line-height:.98}.display-s{font-variation-settings:"ROND" 80;letter-spacing:-.01em;font-size:36px;font-weight:650;font-stretch:108%;line-height:44px}.headline-l{font-variation-settings:"ROND" 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60;font-size:24px;font-weight:600;line-height:32px}.title-l{font-size:22px;font-weight:560;line-height:28px}.title-m{letter-spacing:.01em;font-size:16px;font-weight:600;line-height:24px}.title-s{letter-spacing:.01em;font-size:14px;font-weight:600;line-height:20px}.body-l{font-size:16px;line-height:26px}.body-m{letter-spacing:.01em;font-size:14px;line-height:20px}.body-s{letter-spacing:.02em;font-size:12px;line-height:16px}.label-l{letter-spacing:.01em;font-size:14px;font-weight:580;line-height:20px}.label-m{letter-spacing:.03em;font-size:12px;font-weight:600;line-height:16px}.muted{color:var(--md-sys-color-on-surface-variant)}h1,h2,h3,h4,p{margin:0}.measure{max-width:68ch}.icon{letter-spacing:normal;text-transform:none;white-space:nowrap;-webkit-font-smoothing:antialiased;font-variation-settings:"FILL" 0, "wght" 400, "GRAD" 0, "opsz" 24;-webkit-user-select:none;user-select:none;direction:ltr;flex:none;font-family:Material Symbols Rounded;font-size:24px;font-style:normal;font-weight:400;line-height:1;display:inline-block}.icon.filled{font-variation-settings:"FILL" 1, "wght" 400, "GRAD" 0, "opsz" 24}.state{isolation:isolate;position:relative;overflow:hidden}.state:after{content:"";opacity:0;transition:opacity var(--md-effect-fast);pointer-events:none;z-index:-1;background:currentColor;position:absolute;inset:0}.state:hover:after{opacity:.08}.state:focus-visible:after,.state:active:after{opacity:.12}.btn{--h:48px;height:var(--h);border-radius:var(--md-shape-full);letter-spacing:.01em;cursor:pointer;white-space:nowrap;transition:border-radius var(--md-spring-fast), background-color var(--md-effect), box-shadow var(--md-effect);border:0;justify-content:center;align-items:center;gap:8px;padding:0 24px;font-size:16px;font-weight:580;text-decoration:none;display:inline-flex}.btn:active{border-radius:var(--md-shape-md)}.btn .icon{font-size:20px}.btn.sm{--h:40px;padding:0 16px;font-size:14px}.btn.filled{background:var(--md-sys-color-primary-container);color:#fff}.btn.filled:hover{box-shadow:var(--md-elev-1)}.btn.tonal{background:var(--md-sys-color-secondary-container);color:var(--md-sys-color-on-secondary-container)}.btn.gold{background:var(--md-sys-color-tertiary-fixed-dim);color:var(--md-sys-color-on-tertiary-fixed)}.btn.outlined{color:var(--md-sys-color-on-surface-variant);box-shadow:inset 0 0 0 1px var(--md-sys-color-outline-variant);background:0 0}.btn.text{color:var(--md-sys-color-primary);background:0 0;padding:0 12px}.btn:disabled{opacity:.38;pointer-events:none}.icon-btn{border-radius:var(--md-shape-full);width:48px;height:48px;color:var(--md-sys-color-on-surface-variant);cursor:pointer;transition:border-radius var(--md-spring-fast);background:0 0;border:0;place-items:center;text-decoration:none;display:inline-grid}.icon-btn:active{border-radius:var(--md-shape-md)}.icon-btn.tonal{background:var(--md-sys-color-surface-container-highest)}.chip{border-radius:var(--md-shape-sm);height:36px;box-shadow:inset 0 0 0 1px var(--md-sys-color-outline-variant);color:var(--md-sys-color-on-surface-variant);cursor:pointer;white-space:nowrap;transition:border-radius var(--md-spring-fast), background-color var(--md-effect);background:0 0;border:0;flex:none;align-items:center;gap:8px;padding:0 14px;font-size:14px;font-weight:560;text-decoration:none;display:inline-flex}.chip .icon{font-size:18px}.chip[aria-pressed=true],.chip[aria-checked=true],.chip.selected{background:var(--md-sys-color-secondary-container);color:var(--md-sys-color-on-secondary-container);box-shadow:none;border-radius:var(--md-shape-md)}.chip-row{flex-wrap:wrap;gap:8px;display:flex}.chip-row.scroll{scrollbar-width:none;margin-inline:calc(var(--kh-gutter) * -1);padding-inline:var(--kh-gutter);flex-wrap:nowrap;padding-block:2px;overflow-x:auto}.chip-row.scroll::-webkit-scrollbar{display:none}.segmented{flex-wrap:wrap;gap:2px;display:inline-flex}.segmented button{background:var(--md-sys-color-surface-container-high);height:40px;color:var(--md-sys-color-on-surface-variant);cursor:pointer;border-radius:var(--md-shape-sm);transition:border-radius var(--md-spring-fast), background-color var(--md-effect);border:0;align-items:center;gap:6px;padding:0 16px;font-size:14px;font-weight:580;display:inline-flex}.segmented button:first-child{border-radius:var(--md-shape-full) var(--md-shape-sm) var(--md-shape-sm) var(--md-shape-full)}.segmented button:last-child{border-radius:var(--md-shape-sm) var(--md-shape-full) var(--md-shape-full) var(--md-shape-sm)}.segmented button[aria-checked=true]{background:var(--md-sys-color-primary-container);color:#fff;border-radius:var(--md-shape-full)}.segmented button .icon{font-size:18px}.switch{cursor:pointer;align-items:center;gap:12px;font-size:14px;font-weight:560;display:inline-flex}.switch input{opacity:0;pointer-events:none;position:absolute}.switch .track{border-radius:var(--md-shape-full);background:var(--md-sys-color-surface-container-highest);width:52px;height:32px;box-shadow:inset 0 0 0 2px var(--md-sys-color-outline);transition:background-color var(--md-effect);flex:none;position:relative}.switch .track:after{content:"";background:var(--md-sys-color-outline);width:16px;height:16px;transition:all var(--md-spring-fast);border-radius:50%;position:absolute;top:8px;left:8px}.switch input:checked+.track{background:var(--md-sys-color-primary-container);box-shadow:none}.switch input:checked+.track:after{background:#fff;width:24px;height:24px;top:4px;left:24px}.switch input:focus-visible+.track{outline:3px solid var(--md-sys-color-tertiary-fixed-dim);outline-offset:2px}.search{border-radius:var(--md-shape-full);background:var(--md-sys-color-surface-container-high);height:56px;color:var(--md-sys-color-on-surface-variant);transition:background-color var(--md-effect);align-items:center;gap:8px;padding:0 8px 0 16px;display:flex}.search:focus-within{background:var(--md-sys-color-surface-container-highest);box-shadow:inset 0 0 0 2px var(--md-sys-color-primary)}.search input{min-width:0;font:inherit;color:var(--md-sys-color-on-surface);background:0 0;border:0;outline:none;flex:1;font-size:16px}.search input::placeholder{color:var(--md-sys-color-on-surface-variant)}.card{border-radius:var(--md-shape-xl);background:var(--md-sys-color-surface-container-low);color:inherit;text-decoration:none;display:block}.card.filled{background:var(--md-sys-color-surface-container-highest)}.card.outlined{background:var(--md-sys-color-surface);box-shadow:inset 0 0 0 1px var(--md-sys-color-outline-variant)}a.card,button.card{cursor:pointer;text-align:left;font:inherit;border:0;width:100%}.level{border-radius:var(--md-shape-full);letter-spacing:.02em;white-space:nowrap;align-items:center;gap:6px;height:24px;padding:0 10px 0 8px;font-size:12px;font-weight:650;display:inline-flex}.level.beginner{background:var(--kh-beginner-container);color:var(--kh-on-beginner-container)}.level.intermediate{background:var(--kh-intermediate-container);color:var(--kh-on-intermediate-container)}.level.advanced{background:var(--kh-advanced-container);color:var(--kh-on-advanced-container)}.bars{align-items:flex-end;gap:2px;height:12px;display:inline-flex}.bars i{opacity:.28;background:currentColor;border-radius:2px;width:3px}.bars i:first-child{height:5px}.bars i:nth-child(2){height:8px}.bars i:nth-child(3){height:12px}.bars i.on{opacity:1}.shell{min-height:100dvh}.rail{width:var(--kh-rail);background:var(--md-sys-color-surface-container);z-index:20;flex-direction:column;align-items:center;gap:4px;padding:20px 0;display:flex;position:fixed;inset:0 auto 0 0}.rail .brand{place-items:center;width:56px;height:56px;margin-bottom:28px;text-decoration:none;display:grid}.nav-item{width:80px;color:var(--md-sys-color-on-surface-variant);letter-spacing:.02em;flex-direction:column;align-items:center;gap:4px;padding:4px 0 8px;font-size:12px;font-weight:600;text-decoration:none;display:flex}.nav-item .pill{border-radius:var(--md-shape-full);width:56px;height:32px;transition:background-color var(--md-effect), width var(--md-spring);place-items:center;display:grid}.nav-item:hover .pill{background:color-mix(in srgb, var(--md-sys-color-on-surface) 8%, transparent)}.nav-item[aria-current=page]{color:var(--md-sys-color-on-surface)}.nav-item[aria-current=page] .pill{background:var(--md-sys-color-secondary-container);color:var(--md-sys-color-on-secondary-container)}.nav-item[aria-current=page] .icon{font-variation-settings:"FILL" 1, "wght" 500, "GRAD" 0, "opsz" 24}.nav-item:focus-visible{outline:none}.nav-item:focus-visible .pill{outline:3px solid var(--md-sys-color-tertiary-fixed-dim)}.topbar{z-index:10;height:72px;padding:0 var(--kh-gutter);background:color-mix(in srgb, var(--md-sys-color-surface) 88%, transparent);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);align-items:center;gap:12px;display:flex;position:sticky;top:0}.topbar .wordmark{align-items:center;gap:10px;text-decoration:none;display:none}.topbar .search{flex:1;max-width:560px;height:48px}.topbar .spacer{flex:1}.main{padding:0 var(--kh-gutter) 120px;max-width:calc(var(--kh-max) + var(--kh-gutter) * 2);margin:0 auto}.bottom-nav{display:none}@media (width>=840px){.shell{padding-left:var(--kh-rail)}:root{--kh-gutter:32px}}@media (width<=839px){.rail{display:none}.topbar .wordmark{display:inline-flex}.topbar .search{display:none}.bottom-nav{background:var(--md-sys-color-surface-container);z-index:20;justify-content:space-around;height:80px;padding:12px 0 16px;display:flex;position:fixed;inset:auto 0 0}.bottom-nav .nav-item{flex:1;width:auto;padding:0}}.section{margin-top:64px}.section-head{flex-wrap:wrap;justify-content:space-between;align-items:end;gap:16px;margin-bottom:20px;display:flex}.section-head p{margin-top:4px}.grid{gap:16px;display:grid}.grid.cols-auto{grid-template-columns:repeat(auto-fill,minmax(min(100%,280px),1fr))}.grid.cols-videos{grid-template-columns:repeat(auto-fill,minmax(min(100%,300px),1fr));gap:28px 20px}.page-head{padding-top:24px}.page-head h1{margin-top:8px}.page-head p{margin-top:12px}.crumb{color:var(--md-sys-color-on-surface-variant);align-items:center;gap:4px;font-size:14px;font-weight:580;text-decoration:none;display:inline-flex}.crumb:hover{color:var(--md-sys-color-on-surface)}.crumb .icon{font-size:20px}dialog.sheet{border-radius:var(--md-shape-xl-inc);background:var(--md-sys-color-surface-container-high);width:min(1040px,100vw - 32px,177.778dvh - 497.778px);min-width:min(560px,100vw - 32px);max-height:calc(100dvh - 48px);color:var(--md-sys-color-on-surface);box-shadow:var(--md-elev-3);border:0;padding:0;overflow:auto}dialog.sheet[open]{animation:sheet-in var(--md-spring)}dialog.sheet::backdrop{background:#0000008c}@keyframes sheet-in{0%{opacity:0;transform:translateY(24px)scale(.98)}to{opacity:1;transform:none}}@media (width<=599px){dialog.sheet{border-radius:var(--md-shape-xl) var(--md-shape-xl) 0 0;width:100vw;max-width:100vw;margin:auto 0 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