@layer properties{@supports (((-webkit-hyphens:none)) and (not (margin-trim:inline))) or ((-moz-orient:inline) and (not (color:rgb(from red r g b)))){*,:before,:after,::backdrop{--tw-blur:initial;--tw-brightness:initial;--tw-contrast:initial;--tw-grayscale:initial;--tw-hue-rotate:initial;--tw-invert:initial;--tw-opacity:initial;--tw-saturate:initial;--tw-sepia:initial;--tw-drop-shadow:initial;--tw-drop-shadow-color:initial;--tw-drop-shadow-alpha:100%;--tw-drop-shadow-size:initial}}}@layer theme{:root,:host{--font-sans:-apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", "Noto Sans", Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji";--font-mono:ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;--default-font-family:var(--font-sans);--default-mono-font-family:var(--font-mono)}}@layer base{*,:after,:before,::backdrop{box-sizing:border-box;border:0 solid;margin:0;padding:0}::file-selector-button{box-sizing:border-box;border:0 solid;margin:0;padding:0}html,:host{-webkit-text-size-adjust:100%;tab-size:4;line-height:1.5;font-family:var(--default-font-family,-apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", "Noto Sans", Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji");font-feature-settings:var(--default-font-feature-settings,normal);font-variation-settings:var(--default-font-variation-settings,normal);-webkit-tap-highlight-color:transparent}hr{height:0;color:inherit;border-top-width:1px}abbr:where([title]){-webkit-text-decoration:underline dotted;text-decoration:underline dotted}h1,h2,h3,h4,h5,h6{font-size:inherit;font-weight:inherit}a{color:inherit;-webkit-text-decoration:inherit;-webkit-text-decoration:inherit;-webkit-text-decoration:inherit;-webkit-text-decoration:inherit;text-decoration:inherit}b,strong{font-weight:bolder}code,kbd,samp,pre{font-family:var(--default-mono-font-family,ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace);font-feature-settings:var(--default-mono-font-feature-settings,normal);font-variation-settings:var(--default-mono-font-variation-settings,normal);font-size:1em}small{font-size:80%}sub,sup{vertical-align:baseline;font-size:75%;line-height:0;position:relative}sub{bottom:-.25em}sup{top:-.5em}table{text-indent:0;border-color:inherit;border-collapse:collapse}:-moz-focusring:where(:not(iframe)){outline:auto}progress{vertical-align:baseline}summary{display:list-item}ol,ul,menu{list-style:none}img,svg,video,canvas,audio,iframe,embed,object{vertical-align:middle;display:block}img,video{max-width:100%;height:auto}button,input,select,optgroup,textarea{font:inherit;font-feature-settings:inherit;font-variation-settings:inherit;letter-spacing:inherit;color:inherit;opacity:1;background-color:#0000;border-radius:0}::file-selector-button{font:inherit;font-feature-settings:inherit;font-variation-settings:inherit;letter-spacing:inherit;color:inherit;opacity:1;background-color:#0000;border-radius:0}:where(select:is([multiple],[size])) optgroup{font-weight:bolder}:where(select:is([multiple],[size])) optgroup option{padding-inline-start:20px}::file-selector-button{margin-inline-end:4px}::placeholder{opacity:1}@supports (not ((-webkit-appearance:-apple-pay-button))) or (contain-intrinsic-size:1px){::placeholder{color:currentColor}@supports (color:color-mix(in lab, red, red)){::placeholder{color:color-mix(in oklab, currentcolor 50%, transparent)}}}textarea{resize:vertical}::-webkit-search-decoration{-webkit-appearance:none}::-webkit-date-and-time-value{min-height:1lh;text-align:inherit}::-webkit-datetime-edit{display:inline-flex}::-webkit-datetime-edit-fields-wrapper{padding:0}::-webkit-datetime-edit{padding-block:0}::-webkit-datetime-edit-year-field{padding-block:0}::-webkit-datetime-edit-month-field{padding-block:0}::-webkit-datetime-edit-day-field{padding-block:0}::-webkit-datetime-edit-hour-field{padding-block:0}::-webkit-datetime-edit-minute-field{padding-block:0}::-webkit-datetime-edit-second-field{padding-block:0}::-webkit-datetime-edit-millisecond-field{padding-block:0}::-webkit-datetime-edit-meridiem-field{padding-block:0}::-webkit-calendar-picker-indicator{line-height:1}:-moz-ui-invalid{box-shadow:none}button,input:where([type=button],[type=reset],[type=submit]){appearance:button}::file-selector-button{appearance:button}::-webkit-inner-spin-button{height:auto}::-webkit-outer-spin-button{height:auto}[hidden]:where(:not([hidden=until-found])){display:none!important}}@layer components;@layer utilities{.visible{visibility:visible}.sr-only{clip-path:inset(50%);white-space:nowrap;border-width:0;width:1px;height:1px;margin:-1px;padding:0;position:absolute;overflow:hidden}.block{display:block}.flex{display:flex}.hidden{display:none}.table{display:table}.filter{filter:var(--tw-blur,) var(--tw-brightness,) var(--tw-contrast,) var(--tw-grayscale,) var(--tw-hue-rotate,) var(--tw-invert,) var(--tw-saturate,) var(--tw-sepia,) var(--tw-drop-shadow,)}}:root{--bg:#f5f5f0;--panel:#fff;--raised:#eeeee7;--text:#20231e;--muted:#5d6558;--line:#d5dacd;--accent:#456d29;--accent-soft:#e8f0dd;--danger:#a73135;--shadow:0 10px 40px #15201808;--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light}.dark{--bg:#0c0f0b;--panel:#131812;--raised:#1c231a;--text:#eef1e8;--muted:#a9b39f;--line:#30392b;--accent:#c4e78e;--accent-soft:#25321c;--danger:#ffb4b4;--shadow:none;--lightningcss-light: ;--lightningcss-dark:initial;color-scheme:dark}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:78px;overflow-x:clip}body{background:var(--bg);color:var(--text);margin:0;font-family:Arial,Helvetica,sans-serif;font-size:15px;line-height:1.65;overflow-x:clip}a{color:inherit;text-decoration:none}button,input,textarea,select{font:inherit}button,a,input,textarea,select,summary{touch-action:manipulation}button,summary{cursor:pointer}button:disabled{opacity:.55;cursor:wait}button{color:inherit}input,textarea,select{background:var(--bg);width:100%;color:var(--text);border:1px solid var(--line);border-radius:9px;min-height:44px;padding:11px 13px}textarea{resize:vertical;min-height:125px}input[type=radio],input[type=checkbox]{width:20px;min-height:20px;accent-color:var(--accent)}:focus-visible{outline:3px solid var(--accent);outline-offset:4px}h1,h2,h3,p{margin-top:0}h1{letter-spacing:-.045em;margin-bottom:16px;font-size:clamp(1.9rem,4vw,3rem);font-weight:600;line-height:1.17}h2{letter-spacing:-.025em;margin-bottom:15px;font-size:1.25rem}h3{font-size:1rem}p{margin-bottom:16px}small,.muted{color:var(--muted)}strong{font-weight:600}.eyebrow{letter-spacing:.16em;text-transform:uppercase;color:var(--accent);margin-bottom:12px;font-size:11px;font-weight:700}.skip{z-index:90;background:var(--accent);color:var(--bg);padding:10px;position:fixed;top:-80px;left:16px}.skip:focus{top:12px}.app-shell{grid-template-columns:208px minmax(0,1fr);min-height:100dvh;display:grid}.sidebar{border-right:1px solid var(--line);background:var(--panel);flex-direction:column;gap:30px;height:100dvh;padding:30px 20px;display:flex;position:sticky;top:0}.brand{letter-spacing:-.04em;align-items:center;gap:12px;font-size:18px;font-weight:600;display:flex}.brand-mark{border:1px solid var(--accent);width:34px;height:38px;color:var(--accent);border-radius:10px 10px 3px;place-items:center;font-family:Georgia,serif;font-size:26px;display:grid}.sidebar nav{gap:4px;display:grid}.nav-link{color:var(--muted);border-radius:7px;align-items:center;gap:12px;padding:10px 13px;display:flex}.nav-link:hover,.nav-link[aria-current=page]{background:var(--accent-soft);color:var(--text)}.sidebar-footer{border-top:1px solid var(--line);margin-top:auto;padding-top:18px}.workspace{min-width:0}.topbar{z-index:20;border-bottom:1px solid var(--line);justify-content:space-between;align-items:center;gap:20px;height:78px;padding:0 40px;display:flex;position:sticky;top:0}.topbar .search-button{text-align:left;background:var(--panel);border:1px solid var(--line);min-width:240px;color:var(--muted);border-radius:8px;padding:9px 13px;font-size:13px}kbd{border:1px solid var(--line);border-radius:4px;margin-left:auto;padding:2px 5px;font-size:11px}.content{max-width:1280px;margin:auto;padding:40px}.page-heading p{color:var(--muted);max-width:720px}.row{flex-wrap:wrap;align-items:center;gap:12px;display:flex}.spread{justify-content:space-between}.stack{gap:22px;display:grid}.grid2{grid-template-columns:repeat(2,minmax(0,1fr));gap:22px;display:grid}.grid3{grid-template-columns:repeat(3,minmax(0,1fr));gap:22px;display:grid}.bento{grid-template-columns:1.7fr 1fr;gap:22px;display:grid}.card{background:var(--panel);border:1px solid var(--line);min-width:0;box-shadow:var(--shadow);border-radius:14px;padding:26px}.hero-card{border-top:2px solid var(--accent);flex-direction:column;align-items:flex-start;min-height:270px;padding:32px;display:flex}.hero-card .button{margin-top:auto}.stat{letter-spacing:-.05em;margin:12px 0;font-size:2.6rem;line-height:1.1}.button{background:var(--accent);min-height:44px;color:var(--bg);border:1px solid #0000;border-radius:8px;justify-content:center;align-items:center;gap:9px;padding:10px 18px;font-weight:600;display:inline-flex}.button.secondary{background:var(--raised);border-color:var(--line);color:var(--text)}.text-link{color:var(--accent);text-underline-offset:4px;text-decoration:underline}.badge{letter-spacing:.04em;border:1px solid var(--line);color:var(--muted);border-radius:5px;padding:4px 8px;font-size:11px}.alert{border-left:3px solid var(--accent);background:var(--accent-soft);border-radius:3px 9px 9px 3px;padding:16px 20px}.alert.danger{border-color:var(--danger);color:var(--danger);background:var(--panel)}.divider{border:0;border-top:1px solid var(--line);margin:24px 0}.progress{background:var(--raised);width:100%;height:5px;accent-color:var(--accent);border:0;border-radius:8px;display:block;overflow:hidden}.list{margin:0;padding:0;list-style:none}.list>li{border-bottom:1px solid var(--line);padding:17px 0}.list>li:last-child{border:0}.list a{justify-content:space-between;align-items:center;gap:16px;display:flex}.number{color:var(--muted);font-variant-numeric:tabular-nums;font-size:12px}.phase{border-bottom:1px solid var(--line)}summary{align-items:center;gap:12px;padding:20px 0;font-weight:600;list-style:none;display:flex}summary:before{content:"+";color:var(--accent);font-size:18px}details[open]>summary:before{content:"−"}.module{padding:0 16px 20px 28px}.objective-row{border-top:1px solid var(--line);align-items:center;gap:16px;padding:13px 10px;display:flex}.objective-row:hover{background:var(--raised)}.objective-row .title{flex:1}.filters{grid-template-columns:1fr 180px 170px;gap:12px;margin-bottom:20px;display:grid}.breadcrumbs{color:var(--muted);flex-wrap:wrap;gap:8px;margin-bottom:20px;font-size:12px;display:flex}.lesson-layout{grid-template-columns:180px minmax(0,1fr);gap:30px;display:grid}.steps{counter-reset:step;align-self:start;margin:0;padding:0;list-style:none;position:sticky;top:22px}.steps li a{color:var(--muted);gap:10px;padding:10px 0;font-size:13px;display:flex}.steps li a:before{counter-increment:step;content:counter(step, decimal-leading-zero);color:var(--accent)}.steps a[aria-current=step]{color:var(--text);font-weight:600}.lesson section{scroll-margin-top:25px}.prose{overflow-wrap:anywhere;max-width:75ch}.prose p:last-child{margin-bottom:0}.prose ul,.prose ol{padding-left:24px}.prose blockquote{border-left:2px solid var(--accent);margin:16px 0;padding-left:20px;font-size:1.1rem}.prose pre{white-space:pre-wrap}.example{background:var(--raised);border-radius:8px;margin-bottom:10px;padding:15px 18px}.structured-value{flex-wrap:wrap;align-items:center;gap:8px;display:flex}.structured-value>.prose{flex:auto}.inline-pronunciation{align-items:center;gap:6px;display:inline-flex}.inline-speaker{border:1px solid var(--line);background:var(--panel);width:30px;min-width:30px;height:30px;min-height:30px;color:var(--accent);border-radius:999px;justify-content:center;align-items:center;padding:0;display:inline-flex}.inline-speaker-status{color:var(--muted);font-size:12px}.field{gap:7px;margin-bottom:18px;display:grid}.field>span,.field>label{font-size:13px;font-weight:600}.choices{gap:10px;margin:20px 0;display:grid}.choice{border:1px solid var(--line);border-radius:8px;align-items:flex-start;gap:12px;padding:13px;display:flex}.choice:has(input:checked){border-color:var(--accent);background:var(--accent-soft)}.choice input{flex-shrink:0;margin-top:3px}.feedback{margin-top:20px}.segmented{background:var(--raised);border-radius:9px;gap:4px;width:fit-content;padding:4px;display:flex}.segmented button{background:0 0;border:0;border-radius:6px;min-height:40px;padding:8px 16px}.table{border-collapse:collapse;width:100%;font-size:13px}.table th{text-align:left;color:var(--muted);font-weight:500}.table th,.table td{border-bottom:1px solid var(--line);vertical-align:top;padding:15px 10px}.empty{color:var(--muted);text-align:center;padding:36px 16px}.mobile-only{display:none}.dialog-overlay{z-index:50;background:#0009;position:fixed;inset:0}.dialog-content{background:var(--panel);border:1px solid var(--line);z-index:51;border-radius:14px;width:min(560px,90vw);max-height:70dvh;padding:24px;position:fixed;top:15%;left:50%;overflow:auto;transform:translate(-50%)}.drawer{border-radius:0;flex-direction:column;width:min(300px,85vw);height:100dvh;max-height:100dvh;display:flex;top:0;left:0;transform:none}.dialog-close{background:0 0;border:0;padding:10px;position:absolute;top:14px;right:14px}.command [cmdk-item]{cursor:pointer;border-radius:6px;padding:12px}.command [cmdk-item][data-selected=true]{background:var(--accent-soft)}.command [cmdk-list]{max-height:380px;overflow:auto}.command [cmdk-group-heading]{color:var(--muted);padding:14px 10px 5px;font-size:11px}.command-search{border:1px solid var(--line);background:var(--bg);border-radius:9px;align-items:center;gap:4px;margin-top:14px;padding:3px;display:flex}.command-search [cmdk-input]{background:0 0;border:0;flex:auto;width:auto;min-width:0;min-height:40px;padding:8px 10px}.command-search-submit{width:40px;height:40px;color:var(--text);background:0 0;border:0;border-radius:7px;flex:0 0 40px;place-items:center;padding:0;display:grid}.command-search-submit:hover:not(:disabled){color:var(--accent-ink);background:var(--accent-soft)}.command-search-submit:disabled{cursor:not-allowed}.login{place-items:center;min-height:100dvh;padding:clamp(16px,5vw,64px);display:grid}.login-spread{background:var(--panel);border:1px solid var(--line);border-radius:8px;grid-template-columns:minmax(0,1fr) minmax(0,.88fr);width:min(100%,890px);display:grid}.login-cover{background:var(--side);border-right:1px solid var(--line);border-radius:7px 0 0 7px;flex-direction:column;justify-content:space-between;gap:26px;min-width:0;min-height:440px;padding:clamp(28px,5vw,60px);display:flex}.login-cover .brand-logo{width:120px;max-width:100%}.login-book-title{border-top:1px solid var(--accent-ink);margin:0;padding-top:19px;font:400 clamp(1.05rem,2.1vw,1.5rem)/1.25 Georgia,Times New Roman,serif}.login-book-title span{letter-spacing:-.055em;margin-top:4px;font-size:clamp(2.05rem,4vw,3.35rem);display:block}.login-panel{align-self:center;min-width:0;padding:clamp(26px,5vw,58px)}.login-panel h1{margin:0 0 28px;font-size:clamp(1.8rem,3.5vw,2.55rem)}.login-form{gap:15px;width:100%;display:grid}.login-form .button{width:100%;margin-top:4px}@media (max-width:650px){.login-spread{grid-template-columns:1fr;max-width:424px}.login-cover{border-right:0;border-bottom:1px solid var(--line);border-radius:7px 7px 0 0;flex-direction:row;justify-content:flex-start;align-items:center;gap:clamp(12px,4vw,22px);min-height:0;padding:18px clamp(15px,5vw,28px)}.login-cover .brand{flex:none;align-self:center}.login-cover .brand-logo{width:clamp(54px,15vw,72px)}.login-book-title{border-top:0;border-left:1px solid var(--accent-ink);padding-top:0;padding-left:clamp(12px,4vw,20px);font-size:clamp(.81rem,3.4vw,1rem)}.login-book-title span{font-size:clamp(1.33rem,6.2vw,1.95rem)}.login-panel{padding:25px clamp(20px,6vw,34px) 29px}}.tutor-feed{align-content:start;gap:18px;min-height:230px;display:grid}.tutor-feed[data-empty=true]{min-height:0}.r19-tutor-topics{align-items:end;gap:12px;max-width:690px;display:flex}.r19-tutor-topics>.button{white-space:nowrap;flex-shrink:0;min-height:44px}.topic-picker-field{flex:1;gap:6px;min-width:0;display:grid}.topic-picker-field>span,.r19-read-control>span{color:var(--muted);font-size:14px}.topic-picker-trigger{background:var(--panel);border:1px solid var(--line);text-align:left;border-radius:6px;justify-content:space-between;align-items:center;gap:10px;min-width:0;min-height:44px;padding:8px 12px;display:flex}.topic-picker-trigger span{text-overflow:ellipsis;white-space:nowrap;min-width:0;overflow:hidden}.topic-picker-trigger svg{flex-shrink:0}.topic-picker-trigger:hover:not(:disabled){border-color:var(--accent-ink)}.topic-picker-heading{justify-content:space-between;align-items:center;gap:12px;display:flex}.topic-picker-heading h2{margin:0}.topic-picker-search>svg{color:var(--muted);flex-shrink:0;margin-left:10px}.topic-picker-dialog [cmdk-item]{overflow-wrap:anywhere;justify-content:space-between;align-items:center;gap:10px;min-height:44px;display:flex}.topic-picker-dialog [cmdk-item] small{display:block}.topic-picker-dialog [cmdk-item]>svg{color:var(--accent-ink);flex-shrink:0}.topic-picker-dialog [cmdk-empty]{color:var(--muted);padding:14px 10px}.tutor-open-lesson{justify-self:start;margin-top:-8px}@media (max-width:400px){.r19-tutor-topics{gap:8px}.r19-tutor-topics>.button{padding-inline:9px;font-size:13px}}.r19-tutor-sources{border-top:1px solid var(--line);flex-wrap:wrap;gap:8px 18px;margin-top:18px;padding-top:12px;display:flex}.r19-tutor .message{overflow-wrap:anywhere;min-width:0}.r19-options{border:0;min-width:0;margin:0;padding:0}.r19-options legend{margin-bottom:14px}.r19-option{border:1px solid var(--line);cursor:pointer;border-radius:9px;align-items:start;gap:14px;margin-block:10px;padding:14px 16px;display:flex}.r19-option input{width:auto;accent-color:var(--accent-ink);flex-shrink:0;margin-top:5px}.r19-option.selected{border-color:var(--accent-ink);background:var(--accent-soft)}.r19-confidence{max-width:420px}.r19-activity-feedback{border-top:1px solid var(--line);margin-top:24px;padding-top:20px}.r19-activity-feedback h3{margin-bottom:12px}.r19-activity{overflow-wrap:anywhere;min-width:0}.section-space{margin-top:26px}.message{background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:20px}.message.user{background:var(--raised);margin-left:10%}.composer{background:var(--bg);padding-top:15px;padding-bottom:max(15px, env(safe-area-inset-bottom));position:sticky;bottom:0}.composer textarea{min-height:90px;max-height:220px}.timer{font-variant-numeric:tabular-nums;color:var(--accent);font-size:1.3rem}.toast{background:var(--accent);color:var(--bg);z-index:60;border-radius:8px;padding:14px 22px;position:fixed;bottom:24px;right:24px}.skeleton{background:var(--raised);border-radius:10px;min-height:160px}.settings-form{max-width:600px}.sr-only{clip:rect(0, 0, 0, 0);white-space:nowrap;border:0;width:1px;height:1px;margin:-1px;padding:0;position:absolute;overflow:hidden}@media (max-width:1050px){.app-shell{grid-template-columns:200px minmax(0,1fr)}.sidebar{padding:24px 12px}.content{padding:30px 24px}.topbar{padding:0 24px}.grid3,.lesson-layout{grid-template-columns:1fr}.steps{gap:15px;display:flex;position:static;overflow-x:auto}.steps li{min-width:max-content}.bento{grid-template-columns:1.4fr 1fr}}@media (max-width:760px){.app-shell{display:block}.sidebar,.desktop-only{display:none}.mobile-only{display:inline-flex}.topbar{height:66px;min-height:66px;padding:0 18px}.content{padding:clamp(20px, 6vw, 28px) clamp(16px, 5vw, 24px) calc(28px + env(safe-area-inset-bottom))}.grid2,.bento{grid-template-columns:1fr}.card{padding:21px}.hero-card{min-height:255px;padding:25px}.page-heading{margin-bottom:24px}.filters{grid-template-columns:1fr 1fr}.filters>input{grid-column:1/-1}.objective-row{flex-wrap:wrap;align-items:flex-start;gap:10px}.objective-row .number{width:100%}.objective-row .badge{font-size:10px}.module{padding-left:12px;padding-right:0}.table,.table tbody,.table tr,.table td{display:block}.table thead{display:none}.table tr{border-bottom:1px solid var(--line);padding:14px 0}.table td{border:0;padding:4px 0}.table td:before{content:attr(data-label);color:var(--muted);margin-right:10px;display:inline-block}.toast{bottom:18px;left:18px;right:18px}.message.user{margin-left:4%}.segmented{gap:3px;width:100%}.segmented button{white-space:nowrap;flex:1 1 0;min-width:0;padding-inline:8px;font-size:clamp(11px,3.4vw,13px)}.tutor-feed{min-height:0}.composer{padding-top:14px;padding-bottom:max(18px, env(safe-area-inset-bottom));margin-top:0;position:static}.topbar .search-button{min-width:0;padding:8px}.breadcrumbs{font-size:11px}.row.mobile-stack{flex-direction:column;align-items:stretch}}@media (max-height:650px){.composer{position:static}}@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}:root{--bg:#f5f1e9;--panel:#fffdf8;--side:#eee9df;--raised:#f1ece3;--text:#302729;--muted:#6b5a53;--line:#ded5c9;--accent:#e69b01;--accent2:#e69b01;--accent-ink:#8a4c00;--accent-soft:#fff1c9;--search-bg:#f1ece3;--danger:#a33f4d;--on:#2f1a00;--hero:#64283b;--hero-text:#fff7e9;--hero-muted:#e5cbbd;--progress:#e69b01;--shadow:none;--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light}.dark{--bg:#0b0b0d;--panel:#141416;--side:#101012;--raised:#1c1b1e;--text:#f5ece3;--muted:#b2a9a7;--line:#302d31;--accent:#e69b01;--accent2:#e69b01;--accent-ink:#ffc35c;--accent-soft:#2c2004;--search-bg:#1b1a1d;--danger:#f0a8b5;--on:#160f02;--hero:#35170f;--hero-text:#fff3e9;--hero-muted:#f5cdb5;--progress:#e69b01;--shadow:none;--lightningcss-light: ;--lightningcss-dark:initial;color-scheme:dark}body{background:var(--bg);font-family:Avenir Next,Helvetica Neue,Arial,sans-serif}h1,h2,.stat{font-family:Georgia,Times New Roman,serif;font-weight:500}h1{letter-spacing:-.045em}h2{letter-spacing:-.025em}.sidebar{background:var(--side);gap:22px;width:auto;padding:18px 16px 16px;overflow-y:auto}.brand-mark{border-radius:12px 12px 3px;width:40px;height:42px;font-size:30px}.brand{border-radius:5px;align-self:flex-start;display:inline-block}.brand-wordmark{width:100%;display:block}.brand-logo{width:100%;max-width:96px;height:auto;display:block}.brand-logo-dark{display:none}.sidebar-logout{text-align:left;border:0;width:100%}.drawer nav{margin-top:16px}.nav-link{border-radius:5px;min-height:40px;padding:8px 11px}.sidebar nav{gap:2px}.nav-link:hover,.nav-link[aria-current=page]{color:var(--accent-ink);background:var(--accent-soft)}.nav-link[aria-current=page]{box-shadow:inset 2px 0 var(--accent)}.topbar{background:var(--bg);height:62px;padding:0 38px}.topbar .search-button{border-radius:6px;min-width:178px;height:44px;padding:8px 12px;font-size:13px}.topbar-leading,.topbar-tools{flex-wrap:nowrap;gap:8px}.topbar-tools select{width:92px;min-height:42px;font-size:13px}.topbar kbd{color:var(--muted)}.content{max-width:1280px;padding:34px 38px 36px}.page-heading{margin-bottom:26px}.page-heading h1{letter-spacing:-.035em;text-wrap:balance;margin:0;font-size:clamp(1.95rem,4vw,2.6rem)}.page-heading p{margin:8px 0 0}.card{box-shadow:var(--shadow);border-radius:6px}.hero-card{background:var(--hero);min-height:278px;color:var(--hero-text);border:0;padding:30px}.hero-card .eyebrow,.hero-card p{color:var(--hero-muted)}.hero-card h2{max-width:520px;font-size:2rem;line-height:1.25}.hero-card .button{background:var(--hero-text);color:var(--hero)}.stat{color:var(--accent);font-size:4.1rem}.button{background:var(--accent);min-height:42px;color:var(--on);border-radius:7px;padding:10px 17px}.button.secondary{background:var(--accent-soft);color:var(--accent-ink);border-color:var(--line)}.button.quiet{color:var(--text);border-color:var(--line);background:0 0}.text-link{color:var(--accent-ink)}.badge{border-radius:4px}.badge.active{color:var(--accent-ink);background:var(--accent-soft)}.progress{background:var(--raised);accent-color:var(--progress)}.progress::-webkit-progress-bar{background:var(--raised)}.progress::-webkit-progress-value{background:var(--progress)}:is(.example,.choice:has(input:checked),.segmented){background:var(--raised)}.segmented button[data-state=on],.segmented button[aria-selected=true]{background:var(--panel);color:var(--accent-ink)}.dialog-content{box-shadow:var(--shadow)}.audio-card{border:1px solid var(--line);background:var(--raised);border-radius:7px;margin:18px 0;padding:16px}.audio-player{width:100%;min-height:42px;margin:14px 0 8px;display:block}.eyebrow,.text-link,.stat,.timer,.badge.active,.button.secondary,.segmented button[data-state=on],.segmented button[aria-selected=true],.nav-link:hover,.nav-link[aria-current=page]{color:var(--accent-ink)}.button,.skip,.toast{color:var(--on)}.topbar .search-button{background:var(--search-bg);border:1px solid var(--line);color:var(--text)}.dark .brand-logo-light{display:none}.dark .brand-logo-dark{display:block}@media (max-width:1050px){.topbar{padding:0 25px}.content{padding:30px 25px}.topbar>.row:last-child{flex-wrap:nowrap;min-width:0}.topbar .search-button{white-space:nowrap;flex-wrap:nowrap;flex:210px;min-width:0;overflow:hidden}.topbar select{flex:0 0 92px}}@media (max-width:850px) and (min-width:761px){.topbar .search-button kbd{display:none}}@media (max-width:760px){.topbar{gap:12px;height:66px;padding:0 20px}.topbar>.row:last-child{flex:auto;justify-content:flex-end}.topbar .search-button{flex:0 0 44px;justify-content:center;width:44px;min-width:44px;padding:8px}.hero-card{min-height:280px;padding:24px}.hero-card h2{font-size:1.95rem}html{scroll-padding-top:66px}.topbar{min-height:66px;padding-inline:clamp(16px,5vw,24px)}.content{padding:clamp(20px, 6vw, 28px) clamp(16px, 5vw, 24px) calc(28px + env(safe-area-inset-bottom))}.segmented{width:100%}.segmented button{white-space:nowrap;flex:1 1 0;min-width:0;padding-inline:clamp(6px,2vw,10px)}.composer{position:static}}@media (max-width:760px) and (orientation:landscape){html{scroll-padding-top:62px}.topbar{height:62px;min-height:62px}.content{padding-top:18px}}@media (min-width:761px) and (max-height:650px){.content{padding-top:24px}}.translate-trigger,.translate-swap,.translate-close{color:var(--text);background:var(--panel);border:1px solid var(--line);cursor:pointer;border-radius:7px;flex:none;place-items:center;display:grid}.translate-trigger{width:42px;height:42px;padding:8px}.translate-trigger:hover,.translate-swap:hover,.translate-close:hover{color:var(--accent-ink);background:var(--accent-soft)}.translate-trigger:focus-visible,.translate-swap:focus-visible,.translate-close:focus-visible{outline:2px solid var(--accent-ink);outline-offset:2px}.translate-mark{background-color:var(--accent-ink);flex:none;width:24px;height:24px;display:block;-webkit-mask:url(/translation-mark.png) 50%/contain no-repeat;mask:url(/translation-mark.png) 50%/contain no-repeat}.translate-overlay{background:0 0}.translate-popover{border-radius:10px;width:min(390px,100vw - 24px);max-height:calc(100dvh - 96px);padding:18px;top:70px;left:auto;right:38px;transform:none}.translate-heading,.translate-title-row,.translate-input-footer{align-items:center;display:flex}.translate-heading,.translate-input-footer{justify-content:space-between;gap:12px}.translate-title-row{gap:9px}.translate-title-row .translate-mark{width:21px;height:21px}.translate-title-row h2{margin:0;font-size:17px;line-height:1.3}.translate-close{width:34px;height:34px;padding:0}.translate-languages{grid-template-columns:minmax(0,1fr) 38px minmax(0,1fr);align-items:center;gap:8px;margin:13px 0 14px;display:grid}.translate-language{border:1px solid var(--line);background:var(--raised);border-radius:6px;gap:3px;min-width:0;padding:9px 10px;display:grid}.translate-input-footer small{color:var(--muted);font-size:10px}.translate-language strong{color:var(--text);text-overflow:ellipsis;font-size:13px;overflow:hidden}.translate-swap{width:36px;height:36px;padding:0}.translate-input{resize:vertical;border:1px solid var(--line);background:var(--search-bg);width:100%;min-height:96px;max-height:170px;color:var(--text);font:inherit;border-radius:6px;padding:11px 12px;font-size:13px;line-height:1.55;display:block}.translate-input::placeholder{color:var(--muted);opacity:.8}.translate-input-footer{margin:8px 0 13px}.translate-live-status{color:var(--muted);align-items:center;gap:7px;font-size:10px;display:inline-flex}.translate-result{border:1px solid var(--line);background:var(--raised);min-height:75px;max-height:150px;color:var(--text);white-space:pre-wrap;overflow-wrap:anywhere;border-radius:6px;padding:11px 12px;font-size:13px;line-height:1.55;overflow:auto}.translate-result-placeholder{color:var(--muted)}.translate-result [role=alert]{color:var(--danger,#a53c34)}.translate-spinner{animation:1s linear infinite translate-spin}@keyframes translate-spin{to{transform:rotate(360deg)}}@media (max-width:760px){.translate-trigger{width:42px;height:42px}.translate-popover{width:min(390px,100% - 24px);max-height:calc(100dvh - 86px);top:74px;right:12px}}@media (prefers-reduced-motion:reduce){.translate-spinner{animation:none}}.masterbook-hero,.masterbook-resource{grid-template-columns:minmax(180px,300px) minmax(0,1fr);align-items:center;gap:clamp(24px,5vw,64px);padding:clamp(22px,4vw,48px);display:grid}.masterbook-cover{border:1px solid var(--line);border-radius:5px;width:min(100%,280px);height:auto;margin-inline:auto;display:block;box-shadow:0 18px 40px #24160f1a}.masterbook-hero-copy{justify-items:start;gap:12px;max-width:700px;display:grid}.masterbook-hero-copy h2,.masterbook-resource h2{margin-bottom:0;font-size:clamp(1.5rem,3vw,2.25rem)}.masterbook-hero-copy p{margin-bottom:4px}.masterbook-filter{margin-bottom:0;display:block}.masterbook-filter input{max-width:560px}.masterbook-list{margin:0;padding:0;list-style:none}.masterbook-entry{border-bottom:1px solid var(--line)}.masterbook-entry:last-child{border-bottom:0}.masterbook-entry-main{border-radius:7px;grid-template-columns:38px minmax(0,1fr) max-content 20px;align-items:center;gap:16px;min-height:76px;padding:12px 8px;display:grid}.masterbook-entry-main:hover{background:var(--raised)}.masterbook-entry-title{gap:3px;min-width:0;display:grid}.masterbook-entry-title strong{line-height:1.35}.masterbook-entry-title small{color:var(--muted)}.masterbook-open-card{border-top:2px solid var(--accent)}.masterbook-progress-list,.masterbook-next{margin-top:20px}.masterbook-next .button{max-width:48%}@media (max-width:760px){.masterbook-hero,.masterbook-resource{grid-template-columns:1fr;gap:24px}.masterbook-cover{width:min(65vw,230px)}.masterbook-entry-main{grid-template-columns:30px minmax(0,1fr) 18px;gap:10px}.masterbook-entry-main .badge{grid-column:2;justify-self:start}.masterbook-entry-main>svg{grid-area:1/3}.masterbook-next .button{max-width:100%}}.r19-catalog{gap:22px;max-width:1100px}.r19-catalog-summary{color:var(--muted);flex-wrap:wrap;gap:10px 26px;font-size:14px;display:flex}.r19-search{border:1px solid var(--line);background:var(--panel);border-radius:6px;align-items:center;gap:12px;padding:5px 16px;display:flex}.r19-search input{background:0 0;border:0;padding-inline:0}.r19-chapter{border-top:1px solid var(--line);padding-top:22px}.r19-chapter header{grid-template-columns:56px minmax(0,1fr);align-items:start;gap:20px;margin-bottom:14px;display:grid}.r19-chapter-number{color:var(--muted);font-variant-numeric:tabular-nums;font:38px/1.15 Georgia,serif}.r19-chapter h2{margin:0 0 6px;font-size:1.55rem;line-height:1.3}.r19-chapter header p{color:var(--muted);margin:0;font-size:14px}.r19-topic-list{margin:0;padding:0;list-style:none}.r19-chapter .r19-topic-list{margin-left:76px}.r19-topic-list li+li{border-top:1px solid var(--line)}.r19-topic-list a{border-radius:4px;justify-content:space-between;align-items:center;gap:20px;padding:12px 10px;display:flex}.r19-topic-list a:hover{background:var(--raised)}.r19-topic-list a>span{flex:1;min-width:0}.r19-topic-list a>svg{color:var(--muted);flex-shrink:0}.r19-topic-list strong{font-size:1rem;font-weight:600;line-height:1.4}.r19-topic-list small{margin-top:5px;line-height:1.5;display:block}.r19-search-results small{-webkit-line-clamp:3;-webkit-box-orient:vertical;display:-webkit-box;overflow:hidden}.r19-command-excerpt{white-space:nowrap;text-overflow:ellipsis;max-width:65ch;display:block;overflow:hidden}.r19-lesson{inline-size:min(100%,48rem);min-inline-size:0;margin-inline:auto}.r19-lesson>.breadcrumbs{align-items:baseline}.r19-lesson>.breadcrumbs a{overflow-wrap:anywhere;min-inline-size:0}.r19-book{overflow-wrap:break-word;max-width:78ch;margin:36px auto;font:18px/1.85 Georgia,Times New Roman,serif}.r19-lesson .r19-book{max-width:none}.r19-source-block+.r19-source-block{margin-top:1.15em}.r19-node>:last-child{margin-bottom:0}.r19-node p{margin-bottom:1.1em}.r19-node ul,.r19-node ol{margin-block:1em;padding-left:1.5em}.r19-node li{margin:.35em 0;padding-left:.2em}.r19-node h2,.r19-node h3,.r19-node h4{margin-top:2em;line-height:1.35}.r19-node h2{font-size:1.5em}.r19-node h3{font:600 1.13em/1.4 Georgia,serif}.r19-node a{color:var(--accent-ink);text-underline-offset:3px;text-decoration:underline}.r19-node blockquote{border-left:3px solid var(--accent-ink);background:var(--raised);margin-inline:0;padding:15px 22px}.r19-node pre{border:1px solid var(--line);padding:16px;overflow-x:auto}.r19-table{overscroll-behavior-x:contain;border:1px solid var(--line);border-radius:6px;max-width:100%;margin:22px 0;font:15px/1.6 Avenir Next,Helvetica Neue,Arial,sans-serif;overflow-x:auto}.r19-table table{border-collapse:separate;border-spacing:0;width:100%}.r19-table th,.r19-table td{vertical-align:top;border-bottom:1px solid var(--line);min-width:9ch;padding:13px 16px}.r19-table th{background:var(--raised);font-weight:650}.r19-table td+td,.r19-table th+th{border-left:1px solid var(--line)}.r19-table tbody tr:nth-child(2n) td{background:var(--raised)}@supports (color:color-mix(in lab, red, red)){.r19-table tbody tr:nth-child(2n) td{background:color-mix(in srgb, var(--raised) 42%, var(--panel))}}.r19-table tbody tr:last-child td{border-bottom:0}.r19-diagram{border:1px solid var(--line);border-top:3px solid var(--accent-ink);background:var(--panel);border-radius:6px;margin:30px 0;padding:24px}.r19-diagram h3{margin:0 0 20px;font:500 1.22rem/1.35 Georgia,serif}.r19-diagram-cells{grid-template-columns:repeat(3,minmax(0,1fr));gap:20px;margin:0 0 20px;padding:0;list-style:none;display:grid}.r19-diagram-sentence_bracket .r19-diagram-cells{grid-template-columns:repeat(4,minmax(0,1fr))}.r19-diagram-location_goal .r19-diagram-cells{grid-template-columns:repeat(2,minmax(0,1fr))}.r19-diagram-cells li{background:var(--raised);border-radius:4px;flex-direction:column;gap:9px;margin:0;padding:14px 12px;display:flex;position:relative}.r19-diagram-cells li:not(:last-child):after{content:"→";color:var(--muted);font:16px Arial,sans-serif;position:absolute;top:50%;right:-17px;transform:translateY(-50%)}.r19-diagram-cells span{color:var(--muted);font:12px/1.4 Avenir Next,Arial,sans-serif}.r19-diagram-cells strong{font:500 17px/1.45 Georgia,serif}.r19-diagram figcaption{color:var(--muted);font:14px/1.75 Avenir Next,Arial,sans-serif}.r19-reading-state,.r19-goals{max-width:900px;margin:24px auto;font-size:14px}.r19-listening{z-index:25;left:calc(50% + var(--app-sidebar-width) / 2);bottom:calc(14px + env(safe-area-inset-bottom));width:min(34rem, calc(100% - var(--app-sidebar-width) - 2 * var(--study-inset)));overscroll-behavior:contain;border:1px solid var(--line);background:var(--panel);border-radius:8px;max-height:min(48dvh,300px);padding:15px 17px;font-size:14px;position:fixed;overflow-y:auto;transform:translate(-50%);box-shadow:0 8px 28px #0003}.r19-listening[hidden],.r19-listening audio[hidden]{display:none}.r19-listening>div:first-child{color:var(--muted);align-items:center;gap:8px;display:flex}.r19-selection{overflow-wrap:anywhere;max-height:3.2em;margin:8px 0 12px;overflow:auto}.r19-listening .audio-player{margin-top:8px}.r19-listening [role=status]{margin:8px 0 0}.r19-reading-state{border-block:1px solid var(--line);grid-template-columns:minmax(0,auto) minmax(0,1fr);align-items:start;gap:20px clamp(16px,4vw,30px);padding-block:22px;display:grid}.r19-read-control{gap:8px;display:grid}.r19-read-control .button,.r19-read-complete,.r19-reading-choices .button{text-align:center;white-space:normal;overflow-wrap:anywhere;justify-content:center;min-height:44px;margin:0;padding-inline:10px}.r19-read-complete{color:var(--accent-ink);align-items:center;gap:8px;display:flex}.r19-reading-state fieldset{border:0;min-width:0;margin:0;padding:0}.r19-reading-state legend{color:var(--muted);margin-bottom:8px}.r19-reading-choices{grid-template-columns:repeat(3,minmax(0,1fr));gap:6px;display:grid}.r19-reading-state .selected{border-color:var(--accent-ink);background:var(--accent-soft)}.r19-reading-state>[role=alert]{grid-column:1/-1;margin:0}@media (max-width:980px){.r19-reading-state{grid-template-columns:1fr}.r19-read-control{justify-items:start}}@media (max-width:360px){.r19-reading-choices{grid-template-columns:1fr}}.r19-goals summary{padding-block:8px}.r19-goals ul{color:var(--muted);padding-left:20px}.r19-goals li{margin-top:9px}.r19-next{grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;margin:32px 0 8px;display:grid}.r19-next .button{white-space:normal;text-align:left;overflow-wrap:anywhere;justify-content:flex-start;min-block-size:44px;min-inline-size:0}.r19-next .button svg{flex-shrink:0}.r19-next .r19-next-forward{grid-column:2;justify-content:space-between}.r19-tutor-link{margin:18px 0 0}@media (max-width:700px){.r19-chapter header{grid-template-columns:35px minmax(0,1fr);gap:15px}.r19-chapter-number{font-size:28px}.r19-chapter h2{font-size:1.3rem}.r19-chapter .r19-topic-list{margin-left:0}.r19-topic-list a{padding-inline:0}.r19-book{font-size:17px;line-height:1.85}.r19-table th,.r19-table td{padding:10px 12px}.r19-diagram{padding:18px 14px}.r19-diagram-cells{grid-template-columns:1fr;gap:22px}.r19-diagram-sentence_bracket .r19-diagram-cells,.r19-diagram-location_goal .r19-diagram-cells{grid-template-columns:1fr}.r19-diagram-cells li:not(:last-child):after{content:"↓";inset:auto auto -22px 50%;transform:translate(-50%)}.r19-next{grid-template-columns:minmax(0,1fr);margin-block-start:24px}.r19-next .r19-next-forward{grid-column:auto}.r19-listening{padding:14px}}.study-overview{max-width:1120px}.study-overview-grid{grid-template-columns:minmax(0,1fr) minmax(238px,.44fr);align-items:start;gap:clamp(20px,4vw,46px);display:grid}.study-continue{border-block:1px solid var(--line);min-width:0;padding:clamp(20px,4vw,36px) 0 clamp(22px,4vw,38px)}.study-kicker,.study-chapter-meta,.study-row-meta{color:var(--muted);font-size:13px;line-height:1.45}.study-kicker{margin:0 0 14px;font-weight:600}.study-chapter-meta{flex-wrap:wrap;gap:4px 10px;margin:0 0 12px;display:flex}.study-chapter-meta>span{color:var(--accent-ink);white-space:nowrap}.study-continue h2{overflow-wrap:anywhere;text-wrap:balance;margin:0 0 8px;font-size:clamp(1.8rem,3.25vw,2.65rem);line-height:1.14}.study-topic-de{color:var(--muted);overflow-wrap:anywhere;margin:0}.study-continue-actions{flex-wrap:wrap;align-items:center;gap:10px 20px;margin-top:25px;display:flex}.study-continue-actions>.text-link,.study-overview-progress>.text-link{align-items:center;min-height:40px;font-size:14px;display:inline-flex}.study-overview-side{gap:18px;display:grid}.study-overview-progress{padding:10px 0 0}.study-overview-progress h2{margin:0;font:600 14px/1.4 Avenir Next,Helvetica Neue,Arial,sans-serif}.study-reading-total,.study-metric-value{font-variant-numeric:tabular-nums;margin:8px 0}.study-reading-total strong,.study-metric-value{font:500 2rem/1.15 Georgia,Times New Roman,serif}.study-reading-total span{color:var(--muted)}.study-overview-progress .progress,.study-metrics .progress{height:5px;margin:12px 0 2px;display:block}.study-shortcuts,.study-list{border-top:1px solid var(--line)}.study-shortcuts>a,.study-list>li>a{border-bottom:1px solid var(--line);align-items:center;gap:12px;min-height:44px;padding:10px 4px;display:flex}.study-shortcuts>a:hover,.study-list>li>a:hover{color:var(--accent-ink)}.study-shortcuts>a>svg,.study-list>li>a>svg{color:var(--muted);flex:none;margin-left:auto}.study-shortcuts>a>.study-row-meta{margin-left:auto}.study-shortcuts>a>.study-row-meta+svg{margin-left:0}.study-flow{gap:28px;max-width:890px;display:grid}.study-toolbar{color:var(--muted);flex-wrap:wrap;justify-content:space-between;align-items:center;gap:8px 20px;font-size:14px;display:flex}.study-toolbar strong{color:var(--text)}.study-section>h2{margin:0 0 12px;font-size:1.35rem}.study-list{margin:0;padding:0;list-style:none}.study-list>li>a>span:first-child{overflow-wrap:anywhere;flex:1;min-width:0}.study-list small{margin-top:3px;display:block}.study-list .study-row-meta{text-align:end;max-width:43%}.study-metrics{grid-template-columns:repeat(2,minmax(0,1fr));gap:24px;max-width:890px;display:grid}.study-metrics>section{border-top:1px solid var(--line);padding-top:16px}.study-metrics p:last-child{margin-bottom:0}.study-tutor-topic{border-bottom:1px solid var(--line);justify-content:flex-start;gap:4px 16px;padding-bottom:12px}.study-settings{max-width:600px}.composer-actions{justify-content:flex-end}.practice-directory{max-width:960px}.practice-search{align-items:center;gap:8px;max-width:550px;margin-bottom:28px;display:flex}.practice-search input{background:var(--panel);flex:1;min-width:0}.practice-search button{flex:none;min-height:44px}.practice-chapter-label{grid-template-columns:2ch minmax(0,1fr);align-items:baseline;gap:12px;display:grid}.practice-chapter-number{color:var(--muted);font-variant-numeric:tabular-nums;font-size:13px}.practice-section-heading,.practice-pagination{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:8px 16px;display:flex}.practice-section-heading{margin-bottom:12px}.practice-section-heading h2{margin:0}.practice-pagination{color:var(--muted);justify-content:center;margin:22px 0 0;font-size:14px}@media (min-width:1101px){.practice-chapter-list{grid-template-columns:repeat(2,minmax(0,1fr));column-gap:24px;display:grid}.practice-chapter-list>li>a{height:100%}}@media (max-width:1000px){.study-overview-grid{grid-template-columns:1fr}}@media (max-width:760px){.study-overview-progress{padding-top:0}.study-metrics{grid-template-columns:1fr}}:root{--study-width:1180px;--study-inset:clamp(25px, 3.4vw, 44px);--app-sidebar-width:208px}.content{max-width:var(--study-width);padding-inline:var(--study-inset)}.topbar{padding-inline:max(var(--study-inset), calc((100% - var(--study-width)) / 2 + var(--study-inset)))}.translate-popover{right:max(var(--study-inset), calc((100% - var(--app-sidebar-width) - var(--study-width)) / 2 + var(--study-inset)))}.translate-input-footer{justify-content:flex-start;gap:8px;min-height:44px;margin:4px 0 8px}.translate-input-footer small{margin-left:auto}.translate-result-footer{margin-bottom:0}.translate-sound{width:44px;height:44px;color:var(--accent-ink);background:0 0;border:1px solid #0000;border-radius:6px;flex:0 0 44px;place-items:center;padding:0;display:grid}.translate-sound:hover:not(:disabled){background:var(--accent-soft);border-color:var(--line)}.translate-sound:disabled{color:var(--muted);cursor:default}.translate-speech-error{color:var(--danger);margin:7px 0 0;font-size:13px}.progress-summary{margin-bottom:28px}.progress-count{font-variant-numeric:tabular-nums;white-space:nowrap}.progress-topic-status dl{border-block:1px solid var(--line);grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;margin:0 0 25px;padding-block:12px;display:grid}.progress-topic-status dt{color:var(--muted);font-size:13px}.progress-topic-status dd{margin:3px 0 0}.progress-directory .study-list li[id]{scroll-margin-top:75px}@media (max-width:1050px){:root{--app-sidebar-width:200px}}@media (max-width:760px){:root{--study-inset:clamp(16px, 5vw, 24px);--app-sidebar-width:0px}.translate-popover{right:var(--study-inset);width:min(390px, calc(100% - 2 * var(--study-inset)))}.translate-overlay{background:#0003}}:root{--bg:#f5f1e9;--panel:#fffdf7;--side:#eee7db;--raised:#ede6d8;--text:#28231d;--muted:#61584d;--line:#d9cdbd;--accent:#79482f;--accent2:#79482f;--accent-ink:#783f25;--accent-soft:#f0e0ce;--search-bg:#fbf8f1;--progress:#9a613c;--on:#fff8ed;--feature:#f0e6d8;--feature-border:#cbb396;--cover:#e9dfcd}.dark{--bg:#000;--panel:#080808;--side:#000;--raised:#101010;--text:#f4ede0;--muted:#bab0a0;--line:#262626;--accent:#d6ac74;--accent2:#d6ac74;--accent-ink:#edc98f;--accent-soft:#352a1b;--search-bg:#090909;--progress:#d6ac74;--on:#23180d;--feature:#080808;--feature-border:#2d2d2d;--cover:#000}.content{padding-top:clamp(24px,3.6vw,52px)}.page-heading{border-bottom:1px solid var(--line);margin-bottom:clamp(20px,3.2vw,35px);padding-bottom:16px}.page-heading h1{overflow-wrap:anywhere;font-size:clamp(2rem,4.1vw,3.2rem)}.r19-lesson>.page-heading{border-bottom-color:var(--feature-border);margin-block-end:clamp(16px,2.4vw,24px)}.topbar{background:var(--bg)}.sidebar .brand{padding-inline:9px}.sidebar nav{border-top:1px solid var(--line);padding-top:11px}.nav-link{border-radius:4px}.nav-link[aria-current=page]{color:var(--text);font-weight:600}.button,.button.secondary,.button.quiet{border-radius:5px}.study-list>li>a:hover,.r19-topic-list a:hover,.dk-work-rail a:hover{background:var(--accent-soft)}.dialog-content:not(.drawer){border-radius:8px;box-shadow:0 20px 48px #0002}.dk-home-work{grid-template-columns:minmax(0,1.75fr) minmax(230px,1fr);align-items:stretch;gap:clamp(18px,3vw,38px);display:grid}.dk-current{border:1px solid var(--feature-border);border-top:3px solid var(--accent);background:var(--feature);border-radius:5px;align-content:space-between;gap:clamp(18px,3vw,35px);padding:clamp(18px,3.3vw,38px);display:grid}.dk-current-top,.dk-current-foot,.dk-section-heading{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:8px 14px;display:flex}.dk-current-top p,.dk-current-top span{color:var(--muted);margin:0;font-size:13px}.dk-current-top p{color:var(--accent-ink);font-weight:650}.dk-current-topic h2{overflow-wrap:anywhere;text-wrap:balance;margin:0;font-size:clamp(1.65rem,3vw,2.7rem);line-height:1.16}.dk-current-topic p{color:var(--muted);margin:7px 0 0}.dk-current-foot{justify-content:flex-start}.dk-current-link{color:var(--accent-ink);text-underline-offset:3px;font-size:13px;text-decoration:underline}.dk-work-rail h2,.dk-section-heading h2{margin:0 0 10px;font-size:clamp(1.28rem,2.15vw,1.75rem)}.dk-work-rail ul,.dk-chapter-index ol{border-top:1px solid var(--line);margin:0;padding:0;list-style:none}.dk-work-rail li a{border-bottom:1px solid var(--line);grid-template-columns:20px minmax(0,1fr) 17px;align-items:center;gap:12px;min-height:62px;padding:9px 6px;display:grid}.dk-work-rail li a>svg,.dk-chapter-footer svg{color:var(--accent-ink)}.dk-work-rail li a small{font-size:12px;display:block}.dk-work-rail progress{height:3px;margin:11px 0 0;display:block}.dk-chapter-index{margin-top:clamp(26px,4vw,48px)}.dk-section-heading h2{margin:0}.dk-section-heading{margin-bottom:10px}.dk-section-heading>a{align-items:center;gap:7px;min-height:44px;display:inline-flex}.dk-chapter-index ol{border-bottom:1px solid var(--line);grid-template-columns:repeat(3,minmax(0,1fr));display:grid}.dk-chapter-index li+li{border-left:1px solid var(--line)}.dk-chapter-index li a{flex-direction:column;gap:7px;height:100%;padding:17px clamp(10px,2.25vw,26px) 14px;display:flex}.dk-chapter-index li a:hover{background:var(--panel)}.dk-chapter-counter{color:var(--accent-ink);font-variant-numeric:tabular-nums;font:400 1.55rem/1 Georgia,Times New Roman,serif}.dk-chapter-title{overflow-wrap:anywhere;font:500 1.15rem/1.35 Georgia,Times New Roman,serif}.dk-chapter-index small{line-height:1.4}.dk-chapter-footer{color:var(--muted);justify-content:space-between;gap:10px;margin-top:auto;padding-top:7px;font-size:12px;display:flex}.login-cover{background:var(--cover)}.login-identity{border-top:1px solid var(--feature-border);padding-top:17px}.login-site-name{letter-spacing:-.06em;margin:0;font:500 clamp(2rem,4.3vw,3.55rem)/1.05 Georgia,Times New Roman,serif}.login-site-description{color:var(--muted);margin:9px 0 0;font-size:14px;line-height:1.45}@media (max-width:1000px){.dk-home-work{grid-template-columns:minmax(0,1fr)}}@media (max-width:760px){.dk-chapter-index ol{grid-template-columns:1fr}.dk-chapter-index li+li{border-left:0;border-top:1px solid var(--line)}.dk-chapter-index li a{grid-template-columns:30px minmax(0,1fr);gap:4px 10px;padding:12px 4px;display:grid}.dk-chapter-index li a>:nth-child(n+3){grid-column:2}}@media (max-width:650px){.login-identity{border-top:0;border-left:1px solid var(--feature-border);min-width:0;padding:0 0 0 13px}.login-site-name{font-size:clamp(1.33rem,5.75vw,1.9rem)}.login-site-description{margin-top:5px;font-size:12px}}.r19-narration{min-inline-size:0;margin:0 0 24px}.r19-narration[data-open=true]{background:var(--feature);border:1px solid var(--feature-border);border-radius:5px;grid-template-columns:minmax(0,1fr);gap:10px;padding:clamp(11px,2vw,16px);display:grid}.r19-narration-head{grid-template-columns:minmax(0,1fr) auto auto;align-items:center;gap:9px;font-size:14px;display:grid}.r19-narration-head h2{font:inherit;align-items:center;gap:8px;margin:0;font-weight:600;display:flex}.r19-narration-head h2 svg{flex-shrink:0}.r19-narration-count{color:var(--muted);font-variant-numeric:tabular-nums;white-space:nowrap;font-size:12px}.r19-narration-close{justify-content:center;width:44px;height:44px;padding:0}.r19-narration-controls{grid-template-columns:minmax(0,1fr) auto;align-items:center;gap:10px;display:grid}.r19-narration-controls select{background:var(--panel);text-overflow:ellipsis;min-block-size:44px;min-inline-size:0;padding-block:8px;font-size:14px;line-height:1.25}.r19-narration-picker{min-inline-size:0}.r19-narration-picker select{inline-size:100%}.r19-narration-speed{color:var(--muted);grid-column:2;align-items:center;gap:7px;font-size:13px;display:flex}.r19-narration-speed select{inline-size:4.75rem;padding-inline:8px}.r19-narration>p,.r19-narration-player{margin:0}.r19-narration-player{inline-size:100%;min-inline-size:0;display:block}.r19-narration>.button:not(.r19-narration-start){justify-self:start}.r19-narration-error{color:var(--danger)}.r19-narration-player[hidden]{display:none}@media (max-width:700px){.r19-narration-controls select{font-size:16px}}@property --tw-blur{syntax:"*";inherits:false}@property --tw-brightness{syntax:"*";inherits:false}@property --tw-contrast{syntax:"*";inherits:false}@property --tw-grayscale{syntax:"*";inherits:false}@property --tw-hue-rotate{syntax:"*";inherits:false}@property --tw-invert{syntax:"*";inherits:false}@property --tw-opacity{syntax:"*";inherits:false}@property --tw-saturate{syntax:"*";inherits:false}@property --tw-sepia{syntax:"*";inherits:false}@property --tw-drop-shadow{syntax:"*";inherits:false}@property --tw-drop-shadow-color{syntax:"*";inherits:false}@property --tw-drop-shadow-alpha{syntax:"<percentage>";inherits:false;initial-value:100%}@property --tw-drop-shadow-size{syntax:"*";inherits:false}