@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-border-style:solid;--tw-shadow:0 0 #0000;--tw-shadow-color:initial;--tw-shadow-alpha:100%;--tw-inset-shadow:0 0 #0000;--tw-inset-shadow-color:initial;--tw-inset-shadow-alpha:100%;--tw-ring-color:initial;--tw-ring-shadow:0 0 #0000;--tw-inset-ring-color:initial;--tw-inset-ring-shadow:0 0 #0000;--tw-ring-inset:initial;--tw-ring-offset-width:0px;--tw-ring-offset-color:#fff;--tw-ring-offset-shadow:0 0 #0000;--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-transition-duration:.15s;--default-transition-timing-function:cubic-bezier(.4, 0, .2, 1);--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{.absolute{position:absolute}.fixed{position:fixed}.static{position:static}.container{width:100%}@media (min-width:40rem){.container{max-width:40rem}}@media (min-width:48rem){.container{max-width:48rem}}@media (min-width:64rem){.container{max-width:64rem}}@media (min-width:80rem){.container{max-width:80rem}}@media (min-width:96rem){.container{max-width:96rem}}.block{display:block}.contents{display:contents}.hidden{display:none}.table{display:table}.grow{flex-grow:1}.border{border-style:var(--tw-border-style);border-width:1px}.ring{--tw-ring-shadow:var(--tw-ring-inset,) 0 0 0 calc(1px + var(--tw-ring-offset-width)) var(--tw-ring-color,currentcolor);box-shadow:var(--tw-inset-shadow), var(--tw-inset-ring-shadow), var(--tw-ring-offset-shadow), var(--tw-ring-shadow), var(--tw-shadow)}.invert{--tw-invert:invert(100%);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,)}.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,)}.transition{transition-property:color,background-color,border-color,outline-color,text-decoration-color,fill,stroke,--tw-gradient-from,--tw-gradient-via,--tw-gradient-to,opacity,box-shadow,transform,translate,scale,rotate,filter,-webkit-backdrop-filter,backdrop-filter,display,content-visibility,overlay,pointer-events;transition-timing-function:var(--tw-ease,var(--default-transition-timing-function));transition-duration:var(--tw-duration,var(--default-transition-duration))}}:root{--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light;--ink:#172c37;--muted:#5a6b71;--line:#d9e2e2;--paper:#f6f8f6;--white:#fff;--accent:#176c70;--accent-soft:#e5f1ef}*{box-sizing:border-box}html{scroll-behavior:smooth}body{background:var(--paper);color:var(--ink);margin:0;font-family:Arial,Helvetica,sans-serif;line-height:1.55}a{color:inherit;text-decoration:none}button,input,select{font:inherit}button{cursor:pointer}button:disabled{cursor:not-allowed;opacity:.45}:focus-visible{outline-offset:2px;outline:3px solid #db8d3d}.container{width:min(1120px,100% - 40px);margin-inline:auto}.site-header{border-bottom:1px solid var(--line);background:#fff}.header-inner{justify-content:space-between;align-items:center;gap:24px;min-height:74px;display:flex}.brand{letter-spacing:-.035em;white-space:nowrap;font-family:Georgia,serif;font-size:1.5rem;font-weight:700}.brand span{color:var(--accent)}.nav{flex-wrap:wrap;align-items:center;gap:8px;display:flex}.nav a{color:#40545b;border-radius:4px;padding:8px 10px;font-size:.92rem;font-weight:600}.nav a:hover,.nav a:focus-visible{background:var(--accent-soft);color:#064f54}.site-footer{border-top:1px solid var(--line);color:var(--muted);margin-top:90px;padding:32px 0;font-size:.85rem}.footer-inner{flex-wrap:wrap;justify-content:space-between;gap:20px;display:flex}main{min-height:calc(100vh - 180px)}.eyebrow{color:var(--accent);text-transform:uppercase;letter-spacing:.13em;font-size:.72rem;font-weight:800}h1,h2,h3{letter-spacing:-.025em;font-family:Georgia,Times New Roman,serif;line-height:1.15}h1{margin:12px 0 18px;font-size:clamp(2.3rem,5vw,4rem)}h2{margin:0 0 16px;font-size:clamp(1.65rem,3vw,2.2rem)}h3{margin:0 0 10px;font-size:1.2rem}.lead{color:#425962;max-width:680px;font-size:1.12rem}.page-intro{padding:58px 0 32px}.page-intro h1{font-size:clamp(2.2rem,4vw,3.2rem)}.hero{border-bottom:1px solid var(--line);background:#fff;padding:72px 0 54px}.hero-grid{grid-template-columns:minmax(0,1.5fr) minmax(240px,.7fr);align-items:end;gap:48px;display:grid}.hero-note{border-left:3px solid var(--accent);color:var(--muted);padding-left:22px;font-size:.9rem}.hero-note strong{color:var(--ink);font-family:Georgia,serif;font-size:1.9rem;display:block}.actions{flex-wrap:wrap;gap:10px;margin-top:28px;display:flex}.button{border:1px solid var(--accent);background:var(--accent);color:#fff;border-radius:4px;justify-content:center;align-items:center;gap:8px;min-height:42px;padding:9px 16px;font-size:.92rem;font-weight:700;display:inline-flex}.button:hover:not(:disabled){background:#11585c}.button.secondary{color:var(--accent);background:#fff}.button.secondary:hover:not(:disabled){background:var(--accent-soft)}.button.ghost{color:var(--ink);border-color:var(--line);background:0 0}.button.ghost:hover:not(:disabled){background:#edf3f1}.section{padding:52px 0}.section-heading{justify-content:space-between;align-items:baseline;gap:16px;margin-bottom:20px;display:flex}.text-link{color:var(--accent);text-underline-offset:3px;font-weight:700;text-decoration:underline}.category-grid{grid-template-columns:repeat(3,minmax(0,1fr));gap:14px;display:grid}.category-card,.panel,.question-card{border:1px solid var(--line);background:#fff;border-radius:5px}.category-card{flex-direction:column;justify-content:space-between;min-height:150px;padding:22px;display:flex}.category-card:hover,.question-card:hover{border-color:#78a8a8}.category-card .number{color:var(--accent);font-family:Georgia,serif;font-size:1.7rem}.category-card .count{color:var(--muted);font-size:.82rem}.category-card h3{margin:6px 0 0}.stat-strip{border-top:1px solid var(--line);border-bottom:1px solid var(--line);flex-wrap:wrap;gap:32px;padding:25px 0;display:flex}.stat-strip strong{font-family:Georgia,serif;font-size:1.4rem;display:block}.stat-strip span{color:var(--muted);font-size:.83rem}.browser-layout{grid-template-columns:240px minmax(0,1fr);align-items:start;gap:26px;padding-bottom:50px;display:grid}.filters{padding:20px;position:sticky;top:20px}.field{margin-bottom:17px;display:block}.field span{color:#385059;margin-bottom:6px;font-size:.79rem;font-weight:800;display:block}.field input,.field select{width:100%;min-height:40px;color:var(--ink);background:#fff;border:1px solid #c8d5d5;border-radius:3px;padding:8px 10px}.filter-title{margin-bottom:18px;font-family:Arial,sans-serif;font-size:1rem;font-weight:800}.results-head{color:var(--muted);justify-content:space-between;align-items:center;gap:12px;margin-bottom:16px;display:flex}.results-head strong{color:var(--ink)}.question-list{gap:12px;display:grid}.question-card{padding:22px 24px;display:block}.meta{color:var(--muted);flex-wrap:wrap;align-items:center;gap:8px;font-size:.78rem;font-weight:700;display:flex}.meta .pill{background:var(--accent-soft);color:#125b5e;border-radius:3px;padding:3px 8px;display:inline-block}.question-card h3{letter-spacing:0;white-space:pre-line;margin:15px 0 0;font-family:Arial,sans-serif;font-size:1.05rem;font-weight:700;line-height:1.5}.question-card .open{color:var(--accent);margin-top:16px;font-size:.83rem;font-weight:700;display:block}.tags{flex-wrap:wrap;gap:6px;margin-top:14px;display:flex}.tag{color:#64777d;border:1px solid #dbe4e2;border-radius:3px;padding:2px 6px;font-size:.74rem}.detail-grid{grid-template-columns:minmax(0,1fr) 230px;gap:28px;padding-bottom:50px;display:grid}.question-main{padding:32px}.question-main .prompt{white-space:pre-line;margin:26px 0;font-family:Georgia,serif;font-size:clamp(1.3rem,2.2vw,1.7rem);line-height:1.5}.figure-note{background:#fbf7ec;border:1px solid #e3d6b8;padding:12px 14px;font-size:.9rem}.answer-status{color:var(--muted);font-size:.85rem;font-weight:700}.divider{border:0;border-top:1px solid var(--line);margin:28px 0}.reveal{border:1px solid #cfe1df;border-left:3px solid var(--accent);background:#f8fbfa;margin-top:15px;padding:20px}.reveal h3{letter-spacing:0;font-family:Arial,sans-serif;font-size:.95rem}.reveal ul,.reveal ol{margin:10px 0 0;padding-left:23px}.reveal li+li{margin-top:6px}.formula{background:#eaf1f0;margin-top:8px;padding:8px 10px;font-family:Consolas,monospace;display:block;overflow-x:auto}.sidebar{color:var(--muted);padding:20px;font-size:.88rem}.sidebar strong{color:var(--ink)}.sidebar dt{text-transform:uppercase;letter-spacing:.08em;margin-top:14px;font-size:.75rem}.sidebar dd{color:var(--ink);margin:2px 0 0}.sidebar dl+strong{border-top:1px solid var(--line);margin-top:22px;padding-top:16px;display:block}.part-list{margin:8px 0 0;padding:0;list-style:none}.part-list li{margin:5px 0}.part-list .current{color:var(--ink);font-weight:800}.part-topic{font-size:.8rem}.study-progress{margin-top:36px;padding:22px 24px}.study-progress-head{flex-wrap:wrap;justify-content:space-between;align-items:baseline;gap:12px;display:flex}.study-progress-head h2{margin:0;font-size:1.2rem}.study-progress-head span{color:var(--muted);font-size:.8rem}.study-progress .actions{margin-top:14px}.progress-bar{background:var(--accent-soft);border-radius:4px;height:8px;margin:16px 0 10px;overflow:hidden}.progress-bar span{background:var(--accent);height:100%;display:block}.question-nav{flex-wrap:wrap;justify-content:space-between;gap:12px;margin:22px 0 50px;display:flex}.topic-groups{gap:18px;padding-bottom:50px;display:grid}.topic-group{padding:25px}.topic-links{grid-template-columns:repeat(3,minmax(0,1fr));gap:9px 22px;display:grid}.topic-links a{border-bottom:1px solid var(--line);justify-content:space-between;gap:8px;padding:10px 0;display:flex}.topic-links a:hover{color:var(--accent)}.topic-links small{color:var(--muted);white-space:nowrap}.prose{border:1px solid var(--line);background:#fff;max-width:720px;margin-bottom:60px;padding:32px}.prose p{color:#40545b}.practice-config{max-width:720px;margin-bottom:50px;padding:28px}.practice-config-grid{grid-template-columns:repeat(2,1fr);gap:0 18px;display:grid}.practice-top{color:var(--muted);justify-content:space-between;align-items:center;gap:12px;margin-bottom:16px;display:flex}.empty{text-align:center;color:var(--muted);padding:34px}@media (max-width:800px){.header-inner{flex-direction:column;align-items:flex-start;gap:8px;padding:16px 0}.nav{margin-left:-10px}.hero-grid,.browser-layout,.detail-grid{grid-template-columns:1fr}.hero-note{max-width:400px}.filters{position:static}.category-grid,.topic-links{grid-template-columns:repeat(2,1fr)}}@media (max-width:560px){.container{width:min(100% - 28px,1120px)}.hero{padding:48px 0}.page-intro{padding:38px 0 22px}.category-grid,.topic-links,.practice-config-grid{grid-template-columns:1fr}.question-main,.prose{padding:22px}.nav a{padding:7px 8px;font-size:.82rem}.section{padding:38px 0}}@media (prefers-color-scheme:dark){:root{--lightningcss-light: ;--lightningcss-dark:initial;color-scheme:dark;--ink:#e5eded;--muted:#adbec2;--line:#375057;--paper:#17282e;--white:#20353c;--accent:#8bd4cf;--accent-soft:#29474c}body,.hero,.site-header,.category-card,.panel,.question-card,.prose{background:var(--paper)}.hero,.site-header,.category-card,.panel,.question-card,.prose{border-color:var(--line)}.lead,.prose p,.nav a,.field span{color:#c3d1d3}.field input,.field select{color:var(--ink);background:#20353c;border-color:#52686e}.button.secondary{color:var(--accent);background:#20353c}.button.ghost{color:var(--ink)}.reveal{background:#20383d;border-color:#45666a}.formula{background:#28444a}.meta .pill{color:#a3e5df}.tag{color:#bdcacc;border-color:#4e666b}}.shortcut-hint{color:var(--muted);margin:14px 0 0;font-size:.76rem}@media (hover:none){.shortcut-hint{display:none}}@media print{:root{--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light;--ink:#000;--muted:#333;--line:#bbb;--paper:#fff;--white:#fff;--accent:#000;--accent-soft:#eee}body,.panel,.question-card,.prose,.reveal{color:#000;box-shadow:none;background:#fff!important}.site-header,.site-footer,.actions,.question-nav,.shortcut-hint,.divider,.page-intro .text-link,.filters,.study-progress,.part-list,.sidebar dl+strong{display:none!important}.reveal[hidden]{display:block!important}.detail-grid{display:block}.sidebar{margin-top:16px}.reveal,.question-card{break-inside:avoid;border-color:#bbb}a{color:#000}}@property --tw-border-style{syntax:"*";inherits:false;initial-value:solid}@property --tw-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-shadow-color{syntax:"*";inherits:false}@property --tw-shadow-alpha{syntax:"<percentage>";inherits:false;initial-value:100%}@property --tw-inset-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-inset-shadow-color{syntax:"*";inherits:false}@property --tw-inset-shadow-alpha{syntax:"<percentage>";inherits:false;initial-value:100%}@property --tw-ring-color{syntax:"*";inherits:false}@property --tw-ring-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-inset-ring-color{syntax:"*";inherits:false}@property --tw-inset-ring-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-ring-inset{syntax:"*";inherits:false}@property --tw-ring-offset-width{syntax:"<length>";inherits:false;initial-value:0}@property --tw-ring-offset-color{syntax:"*";inherits:false;initial-value:#fff}@property --tw-ring-offset-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@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}