@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;--spacing:.25rem;--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}.absolute{position:absolute}.fixed{position:fixed}.relative{position:relative}.static{position:static}.float-left{float:left}.m-1{margin:var(--spacing)}.m-2{margin:calc(var(--spacing) * 2)}.m-3{margin:calc(var(--spacing) * 3)}.m-4{margin:calc(var(--spacing) * 4)}.m-5{margin:calc(var(--spacing) * 5)}.mx-1{margin-inline:var(--spacing)}.mx-2{margin-inline:calc(var(--spacing) * 2)}.mx-3{margin-inline:calc(var(--spacing) * 3)}.mx-4{margin-inline:calc(var(--spacing) * 4)}.mx-5{margin-inline:calc(var(--spacing) * 5)}.my-1{margin-block:var(--spacing)}.my-2{margin-block:calc(var(--spacing) * 2)}.my-3{margin-block:calc(var(--spacing) * 3)}.my-4{margin-block:calc(var(--spacing) * 4)}.my-5{margin-block:calc(var(--spacing) * 5)}.mt-1{margin-top:var(--spacing)}.mt-2{margin-top:calc(var(--spacing) * 2)}.mt-3{margin-top:calc(var(--spacing) * 3)}.mt-4{margin-top:calc(var(--spacing) * 4)}.mt-5{margin-top:calc(var(--spacing) * 5)}.mr-1{margin-right:var(--spacing)}.mr-2{margin-right:calc(var(--spacing) * 2)}.mr-3{margin-right:calc(var(--spacing) * 3)}.mr-4{margin-right:calc(var(--spacing) * 4)}.mr-5{margin-right:calc(var(--spacing) * 5)}.mb-1{margin-bottom:var(--spacing)}.mb-2{margin-bottom:calc(var(--spacing) * 2)}.mb-3{margin-bottom:calc(var(--spacing) * 3)}.mb-4{margin-bottom:calc(var(--spacing) * 4)}.mb-5{margin-bottom:calc(var(--spacing) * 5)}.ml-1{margin-left:var(--spacing)}.ml-2{margin-left:calc(var(--spacing) * 2)}.ml-3{margin-left:calc(var(--spacing) * 3)}.ml-4{margin-left:calc(var(--spacing) * 4)}.ml-5{margin-left:calc(var(--spacing) * 5)}.block{display:block}.flex{display:flex}.hidden{display:none}.inline{display:inline}.resize{resize:both}.p-1{padding:var(--spacing)}.p-2{padding:calc(var(--spacing) * 2)}.p-3{padding:calc(var(--spacing) * 3)}.p-4{padding:calc(var(--spacing) * 4)}.p-5{padding:calc(var(--spacing) * 5)}.px-1{padding-inline:var(--spacing)}.px-2{padding-inline:calc(var(--spacing) * 2)}.px-3{padding-inline:calc(var(--spacing) * 3)}.px-4{padding-inline:calc(var(--spacing) * 4)}.px-5{padding-inline:calc(var(--spacing) * 5)}.py-1{padding-block:var(--spacing)}.py-2{padding-block:calc(var(--spacing) * 2)}.py-3{padding-block:calc(var(--spacing) * 3)}.py-4{padding-block:calc(var(--spacing) * 4)}.py-5{padding-block:calc(var(--spacing) * 5)}.pt-1{padding-top:var(--spacing)}.pt-2{padding-top:calc(var(--spacing) * 2)}.pt-3{padding-top:calc(var(--spacing) * 3)}.pt-4{padding-top:calc(var(--spacing) * 4)}.pt-5{padding-top:calc(var(--spacing) * 5)}.pr-1{padding-right:var(--spacing)}.pr-2{padding-right:calc(var(--spacing) * 2)}.pr-3{padding-right:calc(var(--spacing) * 3)}.pr-4{padding-right:calc(var(--spacing) * 4)}.pr-5{padding-right:calc(var(--spacing) * 5)}.pb-1{padding-bottom:var(--spacing)}.pb-2{padding-bottom:calc(var(--spacing) * 2)}.pb-3{padding-bottom:calc(var(--spacing) * 3)}.pb-4{padding-bottom:calc(var(--spacing) * 4)}.pb-5{padding-bottom:calc(var(--spacing) * 5)}.pl-1{padding-left:var(--spacing)}.pl-2{padding-left:calc(var(--spacing) * 2)}.pl-3{padding-left:calc(var(--spacing) * 3)}.pl-4{padding-left:calc(var(--spacing) * 4)}.pl-5{padding-left:calc(var(--spacing) * 5)}.italic{font-style:italic}.line-through{text-decoration-line:line-through}.overline{text-decoration-line:overline}.underline{text-decoration-line:underline}.blur{--tw-blur:blur(8px);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,)}}:root{--background:#f4f7f6;--surface:#fff;--surface-muted:#eef4f2;--ink:#152523;--muted:#647572;--line:#dbe6e3;--brand:#087f7a;--brand-strong:#05635f;--brand-soft:#dff3ef;--blue:#276ea5;--warning:#9a5a13;--shadow:0 16px 50px #15363214}*{box-sizing:border-box}html{background:var(--background)}body{min-width:320px;color:var(--ink);background:radial-gradient(circle at 8% 0%, #10908614, transparent 28rem), radial-gradient(circle at 92% 8%, #3170a412, transparent 24rem), var(--background);text-rendering:optimizelegibility;margin:0;font-family:Inter,PingFang SC,Microsoft YaHei,system-ui,sans-serif;line-height:1.65}a{color:inherit;text-decoration:none}button,input,select{font:inherit}button,select{cursor:pointer}:focus-visible{outline-offset:3px;outline:3px solid #087f7a57}::selection{background:#bde5df}.site-shell{width:min(1180px,100% - 40px);margin-inline:auto}.site-header{z-index:50;-webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px);background:#f8faf9e0;border-bottom:1px solid #dbe6e3d1;position:sticky;top:0}.header-inner{justify-content:space-between;align-items:center;gap:24px;min-height:68px;display:flex}.brand{letter-spacing:-.02em;align-items:center;gap:11px;font-weight:780;display:inline-flex}.brand-mark{color:#fff;background:linear-gradient(145deg,#0a8c84,#1b5f86);border-radius:12px;place-items:center;width:38px;height:38px;display:grid;box-shadow:0 8px 18px #087f7a33}.brand-mark svg{width:23px;height:23px}.brand-name small{color:var(--muted);letter-spacing:.16em;text-transform:uppercase;margin-top:-4px;font-size:10px;font-weight:650;display:block}.main-nav{align-items:center;gap:6px;display:flex}.nav-link{color:#526461;border-radius:9px;padding:8px 13px;font-size:14px;font-weight:620;transition:all .16s}.nav-link:hover{color:var(--brand-strong);background:var(--brand-soft)}.header-action{border:1px solid var(--line);background:var(--surface);color:var(--ink);border-radius:10px;align-items:center;gap:7px;padding:9px 14px;font-size:14px;font-weight:680;display:inline-flex}.header-action:hover{color:var(--brand-strong);border-color:#a8cbc5}.preview-notice{color:#7a4a16;background:#fff7e8;border-bottom:1px solid #efd6aa;font-size:13px}.preview-notice .site-shell{text-align:center;justify-content:center;align-items:center;gap:8px;min-height:36px;display:flex}.page-main{min-height:calc(100vh - 170px)}.site-footer{border-top:1px solid var(--line);color:var(--muted);background:#eef4f299;margin-top:72px}.footer-inner{justify-content:space-between;align-items:center;gap:24px;min-height:92px;font-size:13px;display:flex}.footer-links{flex-wrap:wrap;gap:18px;display:flex}.footer-links a:hover{color:var(--brand)}.hero{padding:72px 0 52px}.hero-grid{grid-template-columns:minmax(0,1.45fr) minmax(300px,.75fr);align-items:center;gap:64px;display:grid}.eyebrow{color:var(--brand-strong);letter-spacing:.06em;align-items:center;gap:8px;margin:0 0 17px;font-size:13px;font-weight:760;display:inline-flex}.eyebrow:before{content:"";background:var(--brand);width:25px;height:2px}.hero h1{letter-spacing:-.045em;max-width:720px;margin:0;font-size:clamp(38px,5.5vw,64px);line-height:1.12}.hero h1 span{color:var(--brand)}.hero-copy{color:#566a66;max-width:670px;margin:22px 0 30px;font-size:17px;line-height:1.8}.search-box{background:var(--surface);max-width:670px;box-shadow:var(--shadow);border:1px solid #cddedb;border-radius:15px;align-items:center;gap:10px;padding:8px 8px 8px 17px;display:flex}.search-box svg{color:#80918e;flex:none}.search-box input{width:100%;min-width:0;color:var(--ink);background:0 0;border:0;outline:0}.search-box button,.button-primary{color:#fff;background:var(--brand);white-space:nowrap;border:0;border-radius:10px;justify-content:center;align-items:center;gap:8px;min-height:42px;padding:9px 18px;font-weight:720;transition:all .15s;display:inline-flex}.search-box button:hover,.button-primary:hover{background:var(--brand-strong);transform:translateY(-1px)}.button-secondary{border:1px solid var(--line);color:#425552;background:var(--surface);border-radius:10px;justify-content:center;align-items:center;gap:8px;min-height:40px;padding:8px 15px;font-weight:660;display:inline-flex}.button-secondary:hover{color:var(--brand-strong);background:#f7fbfa;border-color:#9fc6c0}button:disabled,.button-primary:disabled,.button-secondary:disabled{cursor:not-allowed;opacity:.45;transform:none}.hero-board{background:linear-gradient(#ffffffeb,#f7fbfaf5),radial-gradient(circle,#82bcb5 1px,#0000 1px) 0 0/16px 16px;border:1px solid #c2dad5e6;border-radius:24px;padding:28px;position:relative;overflow:hidden;box-shadow:0 24px 70px #22524d1c}.hero-board:after{content:"";border:36px solid #087f7a14;border-radius:50%;width:180px;height:180px;position:absolute;bottom:-65px;right:-52px}.board-label{color:var(--muted);letter-spacing:.08em;text-transform:uppercase;justify-content:space-between;align-items:center;margin-bottom:24px;font-size:12px;font-weight:700;display:flex}.status-dot{color:var(--brand);letter-spacing:normal;text-transform:none;align-items:center;gap:7px;display:inline-flex}.status-dot:before{content:"";background:#23a67a;border-radius:50%;width:7px;height:7px;box-shadow:0 0 0 5px #23a67a1a}.board-stat{border-bottom:1px solid var(--line);grid-template-columns:1fr auto;align-items:end;gap:10px;padding-bottom:23px;display:grid}.board-stat strong{letter-spacing:-.05em;font-size:48px;line-height:1}.board-stat span{color:var(--muted);font-size:13px}.route-mini{gap:12px;margin-top:20px;display:grid}.route-mini a{background:var(--surface-muted);border-radius:12px;align-items:center;gap:12px;padding:12px 13px;font-size:13px;font-weight:680;display:flex}.route-mini a:hover{color:var(--brand-strong);background:var(--brand-soft)}.route-mini .mini-count{color:var(--muted);font-variant-numeric:tabular-nums;margin-left:auto}.section{padding:42px 0}.section-heading{justify-content:space-between;align-items:end;gap:20px;margin-bottom:24px;display:flex}.section-heading h2,.page-title{letter-spacing:-.035em;margin:0;font-size:clamp(27px,3vw,36px);line-height:1.25}.section-heading p,.page-subtitle{color:var(--muted);margin:8px 0 0}.text-link{color:var(--brand-strong);align-items:center;gap:5px;font-size:14px;font-weight:700;display:inline-flex}.text-link:hover{gap:9px}.track-grid{grid-template-columns:1fr 1fr;gap:18px;display:grid}.track-card{border:1px solid var(--line);background:var(--surface);border-radius:18px;min-height:220px;padding:28px;transition:all .18s;position:relative;overflow:hidden}.track-card:hover{box-shadow:var(--shadow);border-color:#a8ccc6;transform:translateY(-3px)}.track-card:after{content:"";background:#087f7a0f;border-radius:50%;width:180px;height:180px;position:absolute;bottom:-60px;right:-30px}.track-card.linux:after{background:#276ea512}.track-icon,.category-icon{width:44px;height:44px;color:var(--brand);background:var(--brand-soft);border-radius:12px;place-items:center;display:grid}.track-card.linux .track-icon{color:var(--blue);background:#e5eff8}.track-card h3{letter-spacing:-.02em;margin:22px 0 7px;font-size:21px}.track-card p{max-width:430px;color:var(--muted);margin:0;font-size:14px}.track-count{color:var(--muted);font-size:13px;position:absolute;top:31px;right:28px}.category-grid{grid-template-columns:repeat(4,1fr);gap:14px;display:grid}.category-card{border:1px solid var(--line);background:#ffffffbd;border-radius:15px;min-height:158px;padding:20px;transition:all .16s}.category-card:hover{background:var(--surface);border-color:#acd0ca;transform:translateY(-2px)}.category-card h3{margin:17px 0 4px;font-size:16px}.category-card p{color:var(--muted);margin:0;font-size:12px;line-height:1.6}.category-meta{color:var(--muted);justify-content:space-between;align-items:center;font-size:12px;display:flex}.page-head{padding:52px 0 28px}.page-head-row{justify-content:space-between;align-items:end;gap:20px;display:flex}.question-layout{grid-template-columns:225px minmax(0,1fr);align-items:start;gap:28px;display:grid}.side-panel,.detail-aside-card{border:1px solid var(--line);background:#ffffffd6;border-radius:14px;padding:17px;position:sticky;top:116px}.side-panel h2,.detail-aside-card h2{color:#51635f;letter-spacing:.08em;text-transform:uppercase;margin:0 0 12px;font-size:12px}.category-nav{gap:4px;display:grid}.category-nav a{color:#52635f;border-radius:8px;justify-content:space-between;gap:10px;padding:8px 9px;font-size:13px;display:flex}.category-nav a:hover,.category-nav a.active{color:var(--brand-strong);background:var(--brand-soft)}.category-nav span{color:#859590;font-size:12px}.question-content{min-width:0}.filter-panel{border:1px solid var(--line);background:var(--surface);border-radius:15px;padding:18px;box-shadow:0 8px 28px #1c423e0a}.filter-grid{grid-template-columns:minmax(220px,1.6fr) repeat(3,minmax(120px,.8fr)) auto;gap:10px;display:grid}.filter-grid>*,.question-card>div{min-width:0}.field{gap:6px;display:grid}.field label{color:var(--muted);font-size:11px;font-weight:680}.field input,.field select{border:1px solid var(--line);width:100%;height:42px;color:var(--ink);background:#fbfdfc;border-radius:9px;outline:0;min-width:0;padding:0 12px}.field input:focus,.field select:focus{border-color:#73aaa3;box-shadow:0 0 0 3px #087f7a14}.filter-submit{align-self:end;height:42px}.active-filters{color:var(--muted);flex-wrap:wrap;align-items:center;gap:8px;margin-top:13px;font-size:12px;display:flex}.filter-chip{color:var(--brand-strong);background:var(--brand-soft);border-radius:999px;align-items:center;gap:5px;padding:5px 9px;display:inline-flex}.list-meta{color:var(--muted);justify-content:space-between;gap:12px;margin:22px 2px 12px;font-size:13px;display:flex}.question-list{gap:12px;display:grid}.question-card{border:1px solid var(--line);background:var(--surface);border-radius:14px;grid-template-columns:minmax(0,1fr) auto;gap:20px;padding:21px 22px;transition:all .16s;display:grid;position:relative}.question-card:hover{border-color:#a9ccc6;transform:translateY(-1px);box-shadow:0 12px 35px #1a454012}.question-card h2,.question-card h3{letter-spacing:-.012em;margin:8px 0 6px;font-size:17px;line-height:1.45}.question-card h2 a:hover,.question-card h3 a:hover{color:var(--brand-strong)}.question-card p{color:var(--muted);margin:0;font-size:13px}.meta-row,.tag-row{flex-wrap:wrap;align-items:center;gap:7px;display:flex}.meta-label,.tag{color:#58706b;background:#eff4f3;border-radius:999px;align-items:center;gap:5px;padding:3px 8px;font-size:11px;font-weight:620;display:inline-flex}.meta-label.level-advanced{color:#8a4c18;background:#fff0df}.meta-label.level-intermediate{color:#2e6590;background:#e8f2f9}.demo-label{color:#84501a;background:#fff2dd}.tag-row{margin-top:13px}.tag{color:#5b706c;background:0 0;border:1px solid #dfe9e7;padding:2px 7px}.favorite-button{border:1px solid var(--line);color:#758682;background:#fbfdfc;border-radius:10px;place-items:center;width:38px;height:38px;display:grid}.favorite-button:hover,.favorite-button.active{color:#b56516;background:#fff7ea;border-color:#edb879}.pagination{justify-content:center;align-items:center;gap:9px;margin-top:24px;display:flex}.pagination a,.pagination span{border:1px solid var(--line);color:#586965;background:var(--surface);border-radius:9px;place-items:center;min-width:39px;height:39px;font-size:13px;display:grid}.pagination .current{border-color:var(--brand);color:#fff;background:var(--brand)}.pagination .disabled{opacity:.45}.empty-state,.error-state{text-align:center;background:#ffffff9e;border:1px dashed #cbdcd8;border-radius:15px;padding:54px 24px}.empty-state svg,.error-state svg{color:#86a39d;width:42px;height:42px;margin:0 auto 14px}.empty-state h2,.error-state h2{margin:0 0 5px;font-size:19px}.empty-state p,.error-state p{max-width:530px;color:var(--muted);margin:0 auto 18px;font-size:14px}.detail-shell{padding-top:36px}.back-link{color:var(--muted);align-items:center;gap:5px;margin-bottom:22px;font-size:13px;font-weight:650;display:inline-flex}.back-link:hover{color:var(--brand)}.detail-grid{grid-template-columns:minmax(0,1fr) 245px;align-items:start;gap:34px;display:grid}.article-card{border:1px solid var(--line);background:var(--surface);border-radius:18px;min-width:0;padding:clamp(26px,4vw,48px);box-shadow:0 16px 48px #1f44400e}.article-head{border-bottom:1px solid var(--line);padding-bottom:30px}.article-head h1{letter-spacing:-.035em;margin:16px 0 12px;font-size:clamp(29px,4vw,42px);line-height:1.28}.article-head>p{color:var(--muted);margin:0;font-size:15px}.article-section{padding-top:34px;scroll-margin-top:105px}.article-section+.article-section{border-top:1px solid #edf2f1;margin-top:8px}.section-kicker{align-items:center;gap:10px;margin-bottom:16px;display:flex}.section-number{width:27px;height:27px;color:var(--brand-strong);background:var(--brand-soft);border-radius:8px;place-items:center;font-size:11px;font-weight:800;display:grid}.section-kicker h2{letter-spacing:-.018em;margin:0;font-size:20px}.markdown-body{color:#31413e;overflow-wrap:anywhere;font-size:16px;line-height:1.84}.markdown-body p{margin:.8em 0}.markdown-body ul,.markdown-body ol{padding-left:1.45em}.markdown-body li+li{margin-top:.35em}.markdown-body code:not(pre code){color:#0a6c67;background:#f1f6f5;border:1px solid #dce7e4;border-radius:5px;padding:.15em .38em;font-size:.9em}.markdown-body pre{color:#d8e7e4;background:#142321;border:1px solid #243b39;border-radius:12px;max-width:100%;margin:18px 0;padding:18px 20px;font-size:13px;line-height:1.7;overflow-x:auto}.markdown-body pre code{white-space:pre}.answer-gate{text-align:center;background:#f5faf9;border:1px dashed #a8cbc5;border-radius:14px;margin-top:30px;padding:24px}.answer-gate p{color:var(--muted);margin:0 0 13px;font-size:13px}.answer-content{animation:.2s ease-out reveal}@keyframes reveal{0%{opacity:0;transform:translateY(4px)}to{opacity:1;transform:none}}.followup-list{gap:10px;padding:0;list-style:none;display:grid}.followup-list li{background:#f5f8f7;border-radius:10px;padding:12px 14px 12px 34px;position:relative}.followup-list li:before{content:"Q";color:var(--brand);font-size:12px;font-weight:800;position:absolute;top:12px;left:12px}.detail-aside{gap:14px;display:grid}.detail-aside-card{position:static}.toc{gap:3px;display:grid}.toc a{color:var(--muted);border-left:2px solid #0000;padding:6px 8px;font-size:12px}.toc a:hover{border-color:var(--brand);color:var(--brand-strong)}.progress-controls{gap:8px;display:grid}.progress-option{border:1px solid var(--line);color:#52635f;text-align:left;background:#fbfdfc;border-radius:9px;align-items:center;gap:9px;width:100%;padding:8px 10px;font-size:12px;display:flex}.progress-option:hover,.progress-option.active{color:var(--brand-strong);background:var(--brand-soft);border-color:#8dbab3}.local-note{color:#7a6b50;gap:8px;margin:12px 0 0;font-size:11px;line-height:1.55;display:flex}.practice-shell{width:min(900px,100% - 40px);margin:0 auto;padding-top:42px}.practice-topbar{justify-content:space-between;align-items:center;gap:18px;margin-bottom:18px;display:flex}.practice-progress{min-width:190px}.practice-progress-line{background:#dfe9e7;border-radius:999px;height:5px;overflow:hidden}.practice-progress-line span{border-radius:inherit;background:var(--brand);height:100%;display:block}.practice-count{color:var(--muted);text-align:right;margin-bottom:7px;font-size:12px}.practice-card{border:1px solid var(--line);background:var(--surface);box-shadow:var(--shadow);border-radius:20px;padding:clamp(26px,5vw,52px)}.practice-card h1{letter-spacing:-.03em;margin:18px 0 14px;font-size:clamp(27px,4vw,38px);line-height:1.35}.practice-prompt{border-left:3px solid var(--brand);background:#f3f8f7;border-radius:0 10px 10px 0;padding:18px}.practice-answer{border-top:1px solid var(--line);margin-top:26px;padding-top:26px}.practice-actions{justify-content:space-between;align-items:center;gap:12px;margin-top:22px;display:flex}.practice-actions-group{gap:9px;display:flex}.review-grid{grid-template-columns:230px minmax(0,1fr);gap:28px;display:grid}.review-summary{border:1px solid var(--line);background:var(--surface);border-radius:14px;padding:20px}.review-summary h2{margin:0 0 15px;font-size:15px}.summary-row{color:var(--muted);border-top:1px solid #edf2f1;justify-content:space-between;padding:9px 0;font-size:13px;display:flex}.summary-row strong{color:var(--ink)}.tab-list{border:1px solid var(--line);background:#edf3f1;border-radius:11px;gap:7px;margin-bottom:15px;padding:4px;display:flex}.tab-button{color:var(--muted);background:0 0;border:0;border-radius:8px;flex:1;padding:8px 11px;font-size:13px;font-weight:660}.tab-button.active{color:var(--brand-strong);background:#fff;box-shadow:0 3px 10px #193c380f}.prose-page{width:min(820px,100% - 40px);margin:0 auto;padding-top:50px}.prose-card{border:1px solid var(--line);background:var(--surface);border-radius:18px;padding:clamp(26px,5vw,48px)}.prose-card h1{letter-spacing:-.035em;margin:0 0 10px;font-size:36px}.prose-card h2{margin:34px 0 10px;font-size:21px}.prose-card p,.prose-card li{color:#52635f}.source-item{border-top:1px solid var(--line);padding:16px 0}.source-item strong{color:var(--ink);margin-bottom:4px;display:block}.skeleton{background:linear-gradient(90deg,#e7eeec 25%,#f3f6f5 50%,#e7eeec 75%) 0 0/200% 100%;border-radius:8px;animation:1.3s infinite shimmer}@keyframes shimmer{to{background-position-x:-200%}}.mobile-nav{display:none}@media (max-width:980px){.hero-grid{grid-template-columns:1fr;gap:35px}.hero-board{max-width:560px}.category-grid{grid-template-columns:repeat(2,1fr)}.question-layout{grid-template-columns:1fr}.side-panel{position:static}.category-nav{padding-bottom:4px;display:flex;overflow-x:auto}.category-nav a{flex:none}.filter-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.field:first-child{grid-column:1/-1}.filter-submit{grid-column:2}.detail-grid{grid-template-columns:1fr}.detail-aside{grid-template-columns:1fr 1fr}.toc-card{display:none}}@media (max-width:720px){.site-shell{width:min(100% - 24px,1180px)}.header-inner{min-height:60px}.brand-mark{border-radius:10px;width:34px;height:34px}.brand-name{font-size:14px}.brand-name small,.main-nav,.header-action{display:none}.mobile-nav{display:block;position:relative}.mobile-nav summary{border:1px solid var(--line);background:#fff;border-radius:9px;place-items:center;width:38px;height:38px;list-style:none;display:grid}.mobile-nav summary::-webkit-details-marker{display:none}.mobile-nav-menu{border:1px solid var(--line);width:210px;box-shadow:var(--shadow);background:#fff;border-radius:12px;padding:8px;display:grid;position:absolute;top:46px;right:0}.mobile-nav-menu a{border-radius:8px;padding:10px 12px;font-size:14px}.mobile-nav-menu a:hover{background:var(--brand-soft);color:var(--brand-strong)}.preview-notice .site-shell{padding:6px 0;line-height:1.4}.hero{padding:48px 0 30px}.hero h1{font-size:clamp(36px,12vw,48px)}.hero-copy{font-size:15px}.search-box{padding-left:13px}.search-box button span{display:none}.track-grid,.category-grid{grid-template-columns:1fr}.track-card{min-height:190px}.section{padding:30px 0}.section-heading{align-items:start}.page-head{padding-top:36px}.page-head-row{flex-direction:column;align-items:start}.filter-grid{grid-template-columns:minmax(0,1fr)}.field:first-child,.filter-submit{grid-column:1}.question-card{grid-template-columns:minmax(0,1fr) auto;padding:18px}.article-card{border-radius:14px;padding:24px 19px}.article-head h1{font-size:29px}.detail-aside{grid-template-columns:1fr}.practice-shell{width:min(100% - 24px,900px);padding-top:28px}.practice-topbar{align-items:start}.practice-card{padding:24px 19px}.practice-actions{flex-direction:column;align-items:stretch}.practice-actions-group{grid-template-columns:1fr 1fr;display:grid}.practice-actions .button-primary{width:100%}.review-grid{grid-template-columns:1fr}.tab-list{overflow-x:auto}.tab-button{flex:none}.footer-inner{text-align:center;flex-direction:column;justify-content:center;min-height:120px}.footer-links{justify-content:center}}@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}