@font-face{font-family:AtlasCode;src:url('fonts/SourceCodePro-Regular.ttf') format('truetype');font-display:swap}
@font-face{font-family:AtlasMathMain;src:url('fonts/KaTeX_Main-Regular.ttf') format('truetype');font-display:swap}
@font-face{font-family:AtlasMathItalic;src:url('fonts/KaTeX_Math-Italic.ttf') format('truetype');font-display:swap}
@font-face{font-family:AtlasMathAMS;src:url('fonts/KaTeX_AMS-Regular.ttf') format('truetype');font-display:swap}

:root{color-scheme:light;--bg:#f8fafd;--panel:#fff;--sidebar:#f0f4f9;--text:#1f1f1f;--muted:#5f6368;--line:#dfe3e7;--primary:#0b57d0;--green:var(--primary);--light:#e8f0fe;--accent:#d3e3fd;--on-primary:#fff;--surface-hover:#edf2fa;--red:#d93025;--yellow:#fbbc04;--success:#188038;--shadow:0 2px 8px #3c404314,0 1px 2px #3c40431a;--radius:20px}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:96px}body{margin:0;background:var(--bg);color:var(--text);font:14px/1.65 'Google Sans','Roboto',Arial,'Microsoft YaHei',sans-serif}button,input,select,textarea{font:inherit}button,a,input,select,textarea{-webkit-tap-highlight-color:transparent}button{cursor:pointer;color:inherit}a{color:inherit;text-decoration:none}button svg{pointer-events:none}button:disabled{cursor:not-allowed;opacity:.5}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible,summary:focus-visible{outline:3px solid var(--primary);outline-offset:3px}h1,h2,h3,p{margin-top:0}h1{font-size:36px;font-weight:500;line-height:1.35;letter-spacing:-1px;margin-bottom:16px}h2{font-size:24px;font-weight:500;line-height:1.5;letter-spacing:-.4px}h3{font-size:18px;font-weight:500;line-height:1.5}p{color:var(--muted)}small{font-size:12px}svg.ui-icon{width:22px;height:22px;flex-shrink:0;vertical-align:middle}

/* Workspace navigation */
.sidebar{position:fixed;inset:0 auto 0 0;width:264px;padding:25px 14px 0;background:var(--bg);display:flex;flex-direction:column;z-index:20}.brand{display:flex;align-items:center;gap:10px;padding:0 12px;font-size:25px;letter-spacing:-1px;font-weight:500;line-height:1.3}.brand small{display:block;font-size:10px;letter-spacing:.3px;font-weight:400;color:var(--muted);margin-top:7px}.brand-icon{display:flex;align-items:center;justify-content:center;width:37px;height:37px;flex-shrink:0}.brand-icon svg{width:37px;height:37px}.search-launch{display:flex;align-items:center;gap:10px;margin:27px 0 19px;padding:13px 16px;border:0;background:var(--sidebar);border-radius:28px;color:var(--muted);text-align:left;font-size:12px;min-height:48px}.search-launch:hover{background:var(--accent)}.search-launch>span{display:flex;align-items:center}.search-launch kbd{margin-left:auto;font:10px Arial,sans-serif;color:var(--muted);white-space:nowrap;border:1px solid var(--line);border-radius:5px;padding:2px 4px;background:var(--panel)}.primary-nav{display:grid;gap:5px;padding-bottom:21px;border-bottom:1px solid var(--line)}.primary-nav a{display:flex;align-items:center;gap:13px;min-height:46px;padding:10px 17px;border-radius:28px;font-size:13px;color:var(--muted)}.primary-nav a>span{display:flex;align-items:center;width:22px}.primary-nav a:hover{background:var(--sidebar)}.primary-nav a.active{background:var(--accent);color:#0842a0;font-weight:500}.primary-nav small{margin-left:auto;font-size:8px;white-space:nowrap;letter-spacing:.1px;color:var(--muted);background:var(--panel);padding:3px 6px;border-radius:6px}.tree-label{display:flex;justify-content:space-between;padding:23px 17px 13px;color:var(--muted);font-size:12px;font-weight:500}.tree-label span{font-size:11px;font-weight:400}.knowledge-tree{flex:1;overflow:auto;padding:0 0 17px;scrollbar-width:thin;scrollbar-color:var(--line) transparent}.tree-group{margin-bottom:6px}.tree-group summary{list-style:none;display:flex;align-items:center;gap:9px;padding:11px 13px;border-radius:12px;cursor:pointer;font-size:12px;color:var(--text)}.tree-group summary::-webkit-details-marker{display:none}.tree-group summary::before{content:'›';font:20px/1 Arial,sans-serif;color:var(--muted);transition:transform .18s}.tree-group[open] summary::before{transform:rotate(90deg)}.tree-number{font-size:10px;color:var(--muted)}.tree-group a{display:block;margin:2px 5px 2px 29px;padding:9px 10px;border-radius:9px;font-size:12px;color:var(--muted);line-height:1.5}.tree-group a.active{background:var(--light);color:var(--primary);font-weight:500}.tree-group a:hover,.tree-group summary:hover{background:var(--sidebar)}.sidebar-bottom{display:flex;align-items:center;gap:10px;border-top:1px solid var(--line);padding:19px 13px;font-size:11px}.sidebar-bottom small{display:block;font-size:10px;color:var(--muted);margin-top:2px}.status-dot{width:7px;height:7px;background:var(--success);border-radius:50%}.sidebar-bottom button{margin-left:auto;background:transparent;border:0;border-radius:50%;width:40px;height:40px;font-size:23px;color:var(--muted)}.sidebar-bottom button:hover{background:var(--sidebar)}
.workspace{margin-left:264px}.topbar{position:sticky;top:0;z-index:10;height:76px;padding:0 36px;display:flex;align-items:center;justify-content:space-between;gap:20px;background:var(--bg);border-bottom:1px solid transparent}.topbar-leading{display:flex;align-items:center;min-width:0}.crumb{font-size:13px;color:var(--muted);display:flex;align-items:center;white-space:nowrap;min-width:0}.crumb span{margin:0 12px;color:#9aa0a6}.crumb b{font-weight:400;color:var(--text);overflow:hidden;text-overflow:ellipsis}.top-actions{display:flex;align-items:center;gap:18px;flex-shrink:0;font-size:12px}.edition{color:var(--muted)}.top-compare{display:flex;align-items:center;gap:6px;color:var(--primary);font-weight:500}.top-search{display:grid;place-items:center;width:40px;height:40px;border:0;border-radius:50%;background:transparent;color:var(--muted)}.top-search:hover{background:var(--sidebar)}.avatar{display:grid;place-items:center;width:34px;height:34px;border-radius:50%;background:var(--accent);color:var(--primary);font-weight:500;font-size:14px}.mobile-menu{display:none}.scrim{display:none}main{max-width:1500px;padding:25px 36px 52px;margin:0 auto;min-height:calc(100vh - 145px)}.footer{display:flex;justify-content:space-between;gap:20px;margin:0 36px;padding:21px 4px;border-top:1px solid var(--line);color:var(--muted);font-size:11px}

/* Home */
.eyebrow{display:flex;align-items:center;gap:8px;color:var(--primary);font-size:11px;font-weight:500;letter-spacing:1.5px;margin-bottom:19px}.eyebrow::before{content:'';display:block;width:7px;height:7px;border-radius:50%;background:var(--primary)}.hero{display:grid;grid-template-columns:1.3fr 1fr;position:relative;overflow:hidden;border-radius:28px;background:var(--panel);border:1px solid var(--line);padding:40px 40px 25px;gap:0 26px}.hero h1{font-size:42px;line-height:1.35;letter-spacing:-1.5px;margin-bottom:18px;font-weight:500}.hero h1 em{color:var(--primary);font-style:normal}.hero p{font-size:14px;line-height:1.95;margin-bottom:28px;max-width:440px}.hero-actions{display:flex;gap:12px;flex-wrap:wrap}.button{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:40px;padding:9px 19px;background:var(--panel);border:1px solid var(--line);border-radius:24px;color:var(--primary);font-size:12px;font-weight:500;white-space:nowrap;transition:background .18s,box-shadow .18s}.button:hover{background:var(--light);border-color:var(--primary)}.button.primary{background:var(--primary);color:var(--on-primary);border-color:var(--primary)}.button.primary:hover{box-shadow:var(--shadow);filter:brightness(1.04)}.hero-actions .button{min-height:46px;font-size:13px;padding:11px 23px}.hero-art{display:flex;align-items:center;justify-content:center;position:relative;min-height:260px;background:#f3f7ff;border-radius:24px}.hero-art svg{width:100%;max-width:390px;height:auto}.art-caption{position:absolute;bottom:13px;color:#6680aa;font-size:9px;letter-spacing:1.4px}.hero-stats{grid-column:1/-1;display:flex;align-items:center;gap:30px;flex-wrap:wrap;margin-top:31px;padding-top:23px;border-top:1px solid var(--line);font-size:12px;color:var(--muted)}.hero-stats>span{display:flex;align-items:baseline;gap:7px}.hero-stats strong{font-size:24px;font-weight:500;color:var(--text)}.hero-stats>span:nth-child(1) strong{color:#4285f4}.hero-stats>span:nth-child(2) strong{color:#ea4335}.hero-stats>span:nth-child(3) strong{color:#188038}.hero-stats>span:last-child{margin-left:auto;font-size:11px}.section-heading{display:flex;justify-content:space-between;align-items:center;gap:14px;margin:34px 0 18px}.section-heading h2{margin:0;font-size:21px}.section-heading small{font-size:12px;color:var(--muted)}.section-heading a{font-size:12px;color:var(--primary)}.path-panel{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:0;padding:22px 10px;background:var(--panel);border:1px solid var(--line);border-radius:20px}.path-step{display:flex;align-items:flex-start;gap:12px;padding:3px 15px;position:relative}.path-step:not(:last-child){border-right:1px solid var(--line)}.step-number{display:grid;place-items:center;width:33px;height:33px;border-radius:10px;background:var(--light);color:var(--primary);font-size:12px;flex-shrink:0}.path-step strong{display:block;font-size:13px;font-weight:500;margin-bottom:4px}.path-step small{font-size:11px;color:var(--muted)}.path-step:hover strong{color:var(--primary)}.cards{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}.knowledge-card{display:flex;flex-direction:column;min-width:0;padding:23px 24px;min-height:210px;background:var(--panel);border:1px solid var(--line);border-radius:20px;transition:box-shadow .18s,background .18s}.knowledge-card:hover{box-shadow:var(--shadow);background:#fdfdff;border-color:#c4d4ee}.card-top{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:18px}.card-icon{display:grid;place-items:center;width:42px;height:42px;border-radius:13px;color:#1967d2;background:#e8f0fe;font-size:22px}.tone-1 .card-icon{color:#c5221f;background:#fce8e6}.tone-2 .card-icon{color:#956500;background:#fef7e0}.tone-3 .card-icon{color:#137333;background:#e6f4ea}.tone-4 .card-icon{color:#8430ce;background:#f3e8fd}.card-chapter{font-size:9px;letter-spacing:.8px;color:var(--muted)}.knowledge-card h3{font-size:16px;font-weight:500;margin-bottom:9px}.knowledge-card p{font-size:12px;line-height:1.85;flex:1;margin-bottom:20px}.card-bottom{display:flex;align-items:center;justify-content:space-between;color:var(--muted);font-size:11px;gap:8px}.card-bottom span:last-child{font-size:20px;color:var(--primary)}.home-models{display:flex;align-items:center;gap:25px;padding:27px;margin-top:29px;border:1px solid var(--line);border-radius:22px;background:var(--panel)}.home-models h3{font-size:18px;margin-bottom:7px}.home-models p{font-size:12px;margin:0}.home-models .button{margin-left:auto}.model-logos{display:flex;gap:7px;flex-wrap:wrap;max-width:195px;flex-shrink:0}.provider-logo{display:grid;place-items:center;width:34px;height:34px;border:1px solid var(--line);border-radius:11px;font-size:16px;font-weight:500;background:var(--panel);color:var(--text)}.provider-logo.claude{color:#b76548;background:#fff3ed}.provider-logo.gemini{color:#4285f4;background:#edf3ff}.provider-logo.deepseek{color:#4c79c4;background:#edf3ff}.provider-logo.kimi{color:#343d47;background:#f2f4f8}.provider-logo.minimax{color:#ba688d;background:#fcf0f6}.provider-logo.zhipu{color:#6b65b1;background:#f3f0ff}.provider-logo.grok{color:#59626c;background:#f1f2f3}.provider-logo.qwen{color:#8d68ba;background:#f6efff}

/* Model explorer, comparison and calculator */
.page-intro{margin:9px 0 27px}.page-intro h1{font-size:34px;margin-bottom:14px}.page-intro>p{font-size:14px;line-height:1.85;max-width:850px;margin:0}.badge{display:inline-block;font-size:10px;line-height:1.5;padding:4px 8px;background:var(--sidebar);border-radius:7px;color:var(--muted);border:0}.notice{background:var(--light);color:#34527c;border:0;border-radius:16px;padding:18px 21px;font-size:12px;line-height:1.9}.filters{display:flex;align-items:center;gap:9px;flex-wrap:wrap;margin:25px 0 22px}.chip{display:inline-flex;align-items:center;justify-content:center;min-height:36px;padding:7px 14px;border:1px solid var(--line);border-radius:10px;background:var(--panel);font-size:12px;line-height:1.5;transition:background .18s}.chip:hover{background:var(--sidebar)}.chip.active{border-color:transparent;background:var(--accent);color:#0842a0;font-weight:500}.chip.active::before{content:'✓';margin-right:7px}.field{border:1px solid #c4c7c5;border-radius:9px;background:var(--panel);color:var(--text);padding:11px 13px;font-size:13px;min-width:0;min-height:42px;line-height:1.5}.field:hover{border-color:var(--muted)}.field:focus{outline:2px solid var(--primary);outline-offset:-1px;border-color:var(--primary)}.field::placeholder{color:#80868b}.filter-search{margin-left:auto;max-width:230px}.model-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}.model-card{display:flex;flex-direction:column;border:1px solid var(--line);border-radius:20px;background:var(--panel);padding:23px;min-width:0;position:relative;transition:border-color .18s,box-shadow .18s}.model-card:hover{box-shadow:var(--shadow)}.model-card.selected{border:2px solid var(--primary);padding:22px;background:linear-gradient(180deg,var(--light),var(--panel) 130px)}.provider-line{display:flex;align-items:center;gap:8px;font-size:11px;color:var(--muted);margin-bottom:19px;min-width:0}.model-card .provider-logo{width:32px;height:32px;font-size:15px;flex-shrink:0}.provider-line .badge{margin-left:auto;white-space:nowrap;font-size:9px}.model-card h3{font-size:20px;margin-bottom:7px;line-height:1.35}.positioning{font-size:12px;color:var(--primary);margin-bottom:12px;min-height:22px}.model-card p{font-size:12px;line-height:1.85;min-height:46px;margin-bottom:13px}.model-card code{font-size:10px;line-height:1.7;color:var(--muted);display:block;word-break:break-all;margin-bottom:11px}.billing-line{color:var(--muted);font-size:10px;line-height:1.8;margin-bottom:14px}.model-metrics{display:grid;grid-template-columns:1fr 1fr;gap:13px;padding:16px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line);margin: auto 0 17px}.model-metrics small{display:block;font-size:10px;color:var(--muted);margin-bottom:6px}.model-metrics strong{display:block;font-size:14px;font-weight:500;overflow-wrap:anywhere}.model-card-bottom{display:flex;justify-content:space-between;align-items:center;gap:8px}.model-card-bottom a{font-size:11px;color:var(--primary)}.model-card-bottom .button{padding:8px 13px;font-size:11px;min-height:35px}.compare-bar{position:sticky;bottom:18px;z-index:5;display:flex;justify-content:space-between;align-items:center;gap:18px;background:#0b57d0;color:#fff;padding:16px 21px;border-radius:18px;margin-top:25px;box-shadow:0 6px 24px #0b57d033;font-size:12px}.compare-bar>span{min-width:0}.compare-bar .button{background:#ffffff18;color:#fff;border-color:#ffffff66;min-height:36px;font-size:11px;padding:7px 14px}.compare-bar .button:hover{background:#ffffff30}.comparison{margin-top:30px}.table-wrap{overflow:auto;border:1px solid var(--line);border-radius:18px;background:var(--panel)}table{border-collapse:collapse;width:100%;font-size:12px;line-height:1.85}th,td{padding:17px 19px;text-align:left;vertical-align:top;border-bottom:1px solid var(--line);min-width:150px}thead th{background:var(--sidebar);font-weight:500}td:first-child{color:var(--muted);min-width:145px}tr:last-child td{border-bottom:0}td a{color:var(--primary)}.calculator{padding:27px;margin-top:26px;border:1px solid var(--line);border-radius:20px;background:var(--panel)}.calculator h3{font-size:19px;margin-bottom:22px}.calc-fields{display:flex;gap:18px;flex-wrap:wrap}.calc-fields label{display:grid;gap:8px;flex:1;min-width:140px;font-size:12px;color:var(--muted)}.calc-fields input{width:100%}.calc-results{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:13px;margin:24px 0 18px}.calc-result{background:var(--sidebar);border-radius:13px;padding:17px;font-size:12px;min-width:0;overflow-wrap:anywhere}.calc-result strong{display:block;color:var(--primary);font-size:28px;font-weight:500;margin:7px 0}.calc-result small{display:block;font-size:10px;color:var(--muted)}.fine-print{font-size:11px;line-height:1.9;color:var(--muted);margin:14px 0 0}.fine-print a{color:var(--primary)}

/* Reading view: complete extracted content */
.article-layout{display:block;max-width:980px;margin:0 auto}.article{background:var(--panel);border:1px solid var(--line);border-radius:24px;padding:38px 45px;min-width:0}.article-heading{position:relative;padding-bottom:25px;margin-bottom:30px;border-bottom:1px solid var(--line)}.article-heading h1{padding-right:48px;font-size:34px;margin-bottom:15px}.article-heading .favorite{position:absolute;right:0;top:40px}.favorite{display:grid;place-items:center;width:40px;height:40px;border:1px solid var(--line);border-radius:50%;background:var(--panel);color:var(--muted);font-size:23px}.favorite:hover{background:var(--light)}.favorite.is-saved{background:#fef7e0;color:#946c00;border-color:transparent}.article-meta{display:flex;align-items:center;gap:16px;font-size:12px;color:var(--muted)}.article h2{font-size:22px;margin:25px 0 26px;color:var(--primary)}.original-content{color:var(--text);font-size:16px;line-height:1.95;overflow-wrap:anywhere}.original-content p{font-size:16px;color:var(--text);line-height:1.95;margin:0 0 19px}.original-content h3{font-size:24px;font-weight:500;line-height:1.6;margin:35px 0 22px}.original-content h3:first-child{margin-top:0}.original-content h4{font-size:19px;font-weight:500;line-height:1.7;margin:30px 0 16px}.original-content strong{font-weight:650}.original-content code{font-family:AtlasCode,Consolas,monospace;font-size:.88em;background:var(--sidebar);border-radius:5px;padding:2px 5px;box-decoration-break:clone}.source-figure{margin:27px 0 32px}.source-figure a{display:block;cursor:zoom-in}.source-figure img{display:block;max-width:100%;height:auto;margin:0 auto;background:#fff;border-radius:8px}.source-code{margin:23px 0 28px;padding:16px 0 19px;border:1px solid var(--line);border-radius:14px;background:var(--sidebar);overflow-x:auto;font-family:AtlasCode,Consolas,monospace;font-size:13px;line-height:1.9}.code-row{display:flex;min-width:max-content}.code-number{flex:0 0 45px;padding:0 12px;color:var(--muted);text-align:right;font-size:12px;user-select:text}.original-content .code-row code{white-space:pre;background:none;border-radius:0;padding:0 22px 0 10px;font-size:13px;line-height:1.9;color:var(--text)}.code-label{font:12px/1.8 'Roboto',Arial,'Microsoft YaHei',sans-serif;color:var(--muted);padding:0 22px 11px}.source-table{overflow-x:auto;margin:26px 0 30px;border:1px solid var(--line);border-radius:14px}.source-table table{font-size:14px;line-height:1.8}.source-table td,.source-table th{padding:14px 17px;border-right:1px solid var(--line);min-width:125px}.source-table th{background:var(--sidebar);font-weight:500}.source-table td:last-child,.source-table th:last-child{border-right:0}.math-main{font-family:AtlasMathMain,'Cambria Math',serif}.math-math{font-family:AtlasMathItalic,'Cambria Math',serif}.math-ams{font-family:AtlasMathAMS,'Cambria Math',serif}.source-serif{font-family:'Times New Roman',serif}.original-content sup,.original-content sub{font-size:.7em;line-height:0}.article-pagination{display:flex;justify-content:space-between;gap:20px;margin-top:38px;border-top:1px solid var(--line);padding-top:25px}.article-pagination a{max-width:48%;font-size:13px;color:var(--primary);line-height:1.7}.article-pagination small{display:block;font-size:11px;color:var(--muted);margin-bottom:7px}

/* Evaluation notebook and saved records */
.lab-layout{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:22px}.panel{border:1px solid var(--line);border-radius:20px;background:var(--panel);padding:27px;min-width:0}.panel h3{margin-bottom:21px;font-size:19px}.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:19px}.form-grid label{display:grid;gap:9px;font-size:12px;color:var(--muted)}.full{grid-column:1/-1}textarea.field{resize:vertical;min-height:115px;font-size:13px;line-height:1.9}.form-actions{display:flex;gap:12px;margin-top:24px;flex-wrap:wrap}.lab-guide{align-self:start}.lab-guide p,.lab-guide li{font-size:12px;line-height:1.95}.lab-guide li{color:var(--muted);margin-bottom:12px}.lab-guide ul{padding-left:18px}.lab-guide .notice{font-size:11px;padding:16px;margin-top:21px}.record-controls{display:flex;align-items:center;flex-wrap:wrap;gap:9px}.record-controls .button{font-size:11px;padding:8px 15px}.record-controls .field{max-width:230px}.empty-state{padding:48px 24px;text-align:center;background:var(--panel);border:1px solid var(--line);border-radius:20px;font-size:13px;color:var(--muted)}.empty-state strong{display:block;font-size:19px;font-weight:500;color:var(--text);margin-bottom:11px}.empty-state a{display:inline-block;color:var(--primary);margin-top:9px}.record-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}.record-card{padding:24px;border:1px solid var(--line);border-radius:18px;min-width:0;background:var(--panel)}.record-card h3{font-size:18px;margin-bottom:8px}.record-card small{color:var(--muted);font-size:11px}.record-card .answer{font-size:12px;line-height:1.95;color:var(--text);white-space:pre-wrap;overflow-wrap:anywhere;max-height:290px;overflow:auto;margin-top:19px;border-top:1px solid var(--line);padding-top:17px}.record-card .scores{padding:9px 11px;background:var(--light);border-radius:9px;font-size:11px;color:var(--primary);margin-top:18px}.record-note{font-size:11px;color:var(--muted);white-space:pre-wrap;overflow-wrap:anywhere;margin:13px 0}.record-card button{border:0;background:transparent;border-radius:18px;color:var(--red);font-size:11px;padding:6px 9px;margin:10px 0 0 -9px}.record-card button:hover{background:#fce8e6}.evaluation-summary{margin:20px 0}

/* Search overlay and feedback */
dialog{max-width:680px;width:calc(100% - 36px);top:12vh;margin:0 auto;padding:0;border:1px solid var(--line);border-radius:24px;background:var(--panel);color:var(--text);box-shadow:0 16px 64px #20212440}dialog::backdrop{background:#20212450;backdrop-filter:blur(3px)}.search-input-wrap{display:flex;align-items:center;gap:15px;padding:22px 24px;border-bottom:1px solid var(--line)}.search-input-wrap>span{display:flex;align-items:center;color:var(--primary)}#global-search{width:100%;border:0;outline:none;background:transparent;color:var(--text);font-size:16px;min-width:0}#search-close{border:1px solid var(--line);border-radius:6px;background:var(--sidebar);font-size:11px;padding:4px 7px;color:var(--muted)}#search-results{max-height:50vh;overflow:auto;padding:12px}.search-result{display:block;padding:15px 17px;border-radius:12px;font-size:14px}.search-result small{display:block;font-size:11px;color:var(--muted);margin-top:5px}.search-result:hover,.search-result.focused{background:var(--light);color:var(--primary)}.search-footer{display:flex;justify-content:space-between;gap:12px;padding:17px 25px;border-top:1px solid var(--line);color:var(--muted);font-size:11px}#toast{position:fixed;bottom:28px;left:50%;transform:translate(-50%,15px);max-width:calc(100vw - 32px);background:#303134;color:#fff;font-size:13px;padding:15px 23px;border-radius:10px;box-shadow:var(--shadow);opacity:0;transition:opacity .18s,transform .18s;pointer-events:none;z-index:100}#toast.show{opacity:1;transform:translate(-50%,0)}

/* Material dark surfaces */
body.dark{color-scheme:dark;--bg:#131314;--panel:#1e1f20;--sidebar:#242629;--text:#e3e3e3;--muted:#a9acb1;--line:#3c4043;--primary:#a8c7fa;--accent:#004a77;--light:#23344d;--on-primary:#062e6f;--surface-hover:#2a2e36;--success:#81c995;--red:#f28b82;--shadow:0 3px 15px #0004}.dark .primary-nav a.active,.dark .chip.active{color:#c2e7ff}.dark .hero-art{background:#242f41}.dark .art-caption{color:#a8c7fa}.dark .hero-art .art-card{fill:#303b4b;stroke:#51617a}.dark .hero-art .art-label{fill:#d3e3fd}.dark .hero-art .art-center{fill:#303b4b;stroke:#51617a}.dark .hero-art .art-link{stroke:#51617a}.dark .hero-art .art-symbol{stroke:#a8c7fa}.dark .hero-stats>span:nth-child(1) strong{color:#8ab4f8}.dark .hero-stats>span:nth-child(2) strong{color:#f28b82}.dark .hero-stats>span:nth-child(3) strong{color:#81c995}.dark .notice{color:#c4d7f3}.dark .knowledge-card:hover{background:#25282c;border-color:#5e7495}.dark .card-icon{background:#23344d;color:#a8c7fa}.dark .tone-1 .card-icon{background:#452627;color:#f28b82}.dark .tone-2 .card-icon{background:#423b25;color:#fdd663}.dark .tone-3 .card-icon{background:#243c2a;color:#81c995}.dark .tone-4 .card-icon{background:#382843;color:#d7aefb}.dark .provider-logo{background:#282a2e}.dark .provider-logo.claude{color:#efab8b}.dark .provider-logo.gemini,.dark .provider-logo.deepseek{color:#8ab4f8}.dark .provider-logo.kimi,.dark .provider-logo.grok{color:#dadce0}.dark .provider-logo.minimax{color:#f4b1d0}.dark .provider-logo.zhipu,.dark .provider-logo.qwen{color:#d7aefb}.dark .compare-bar{background:#a8c7fa;color:#062e6f;box-shadow:0 6px 24px #0004}.dark .compare-bar .button{color:#062e6f;border-color:#062e6f55;background:#ffffff24}.dark .favorite.is-saved{background:#423b25;color:#fdd663}.dark .record-card button:hover{background:#452627}

/* Responsive workspace */
@media(min-width:1600px){main{padding:32px 48px 60px}.topbar{padding:0 48px}.footer{margin:0 48px}.hero{padding:48px 48px 30px}.hero h1{font-size:48px}.hero p{font-size:15px}.hero-art{min-height:290px}.knowledge-card{min-height:220px}}
@media(max-width:1200px){.sidebar{width:240px;padding-left:10px;padding-right:10px}.workspace{margin-left:240px}.brand{font-size:23px;padding:0 11px}.brand-icon,.brand-icon svg{width:33px;height:33px}.primary-nav a{padding-left:14px;padding-right:14px}.topbar{padding:0 27px}main{padding:23px 27px 45px}.footer{margin:0 27px}.hero{padding:32px 30px 24px;gap:0 20px}.hero h1{font-size:35px}.hero p{font-size:13px}.hero-art{min-height:245px}.hero-stats{gap:22px}.hero-stats>span:last-child{margin-left:0}.path-panel{padding:19px 8px}.path-step{padding:2px 11px;gap:9px}.path-step strong{font-size:12px}.path-step small{font-size:10px}.step-number{width:29px;height:29px}.cards,.model-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.lab-layout{grid-template-columns:1fr}.lab-guide{display:block}.record-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.top-actions{gap:14px}.edition{display:none}.article{padding:34px 35px}}
@media(max-width:900px){.hero{grid-template-columns:1fr}.hero-art{display:none}.hero h1{font-size:38px}.hero p{max-width:none}.path-panel{grid-template-columns:repeat(2,minmax(0,1fr));gap:22px 0}.path-step:nth-child(2){border:0}.home-models{flex-wrap:wrap;gap:20px}.home-models .button{margin-left:0}.article{padding:29px}.record-controls{gap:7px}.section-heading:has(.record-controls){align-items:flex-start;flex-direction:column;gap:15px}.calc-results{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:760px){html{scroll-padding-top:80px}.sidebar{width:280px;padding:25px 16px 0;transform:translateX(-100%);transition:transform .2s ease;box-shadow:var(--shadow)}.sidebar.open{transform:translateX(0)}.brand{font-size:25px}.workspace{margin-left:0}.scrim.visible{display:block;position:fixed;inset:0;background:#20212466;z-index:19}.topbar{height:64px;padding:0 15px;gap:8px;border-bottom:1px solid var(--line)}.mobile-menu{display:grid;place-items:center;flex-shrink:0;width:40px;height:40px;margin-right:7px;background:transparent;border:0;border-radius:50%;color:var(--muted);font-size:22px}.crumb{font-size:12px}.crumb>span{margin:0 8px}.crumb .workspace-name{display:none}.crumb>span{display:none}.top-actions{gap:7px}.top-compare{display:none}.top-search{width:36px;height:36px}.avatar{width:31px;height:31px;font-size:13px}main{padding:21px 17px 35px;min-height:calc(100vh - 125px)}.footer{margin:0 17px;padding:19px 0;font-size:10px}.footer>span:last-child{display:none}.hero{padding:28px 24px 22px;border-radius:23px}.hero h1{font-size:32px;letter-spacing:-1px}.hero p{font-size:13px;line-height:1.9}.hero .eyebrow{font-size:10px;letter-spacing:1px}.hero-actions{gap:9px}.hero-actions .button{font-size:12px;padding:10px 17px;min-height:43px}.hero-stats{gap:14px 21px;padding-top:21px;margin-top:26px;font-size:11px}.hero-stats strong{font-size:22px}.hero-stats>span:last-child{flex-basis:100%;font-size:10px}.section-heading{margin:29px 0 16px;gap:12px;align-items:flex-start}.section-heading h2{font-size:19px}.section-heading small{font-size:10px;text-align:right;max-width:44%;padding-top:5px}.path-panel{padding:20px 8px;gap:20px 0;border-radius:17px}.path-step{gap:8px;padding:0 10px}.path-step strong{font-size:12px}.path-step small{font-size:10px;line-height:1.5;display:block}.step-number{width:28px;height:29px;font-size:11px;border-radius:9px}.cards{grid-template-columns:1fr;gap:13px}.knowledge-card{padding:21px 23px;min-height:185px;border-radius:18px}.card-top{margin-bottom:15px}.knowledge-card h3{font-size:17px}.knowledge-card p{font-size:12px;margin-bottom:16px}.home-models{padding:24px;gap:18px;border-radius:18px}.model-logos{max-width:100%}.home-models h3{font-size:17px}.home-models p{font-size:12px}.page-intro{margin:5px 0 24px}.page-intro h1{font-size:29px}.page-intro>p{font-size:13px}.page-intro .eyebrow{font-size:10px}.notice{padding:16px 18px;font-size:11px;border-radius:14px}.model-grid{grid-template-columns:1fr;gap:15px}.model-card{padding:23px}.model-card.selected{padding:22px}.model-card h3{font-size:21px}.model-card p{min-height:0}.filter-search{max-width:none;width:100%;margin-left:0}.filters{gap:8px;margin:22px 0 20px}.chip{min-height:36px;font-size:11px;padding:7px 12px}.filters>select{width:100%}.compare-bar{padding:14px 16px;border-radius:16px;bottom:12px;gap:12px;flex-direction:column;align-items:stretch;font-size:11px}.compare-bar>div{align-self:flex-end}.comparison th,.comparison td{min-width:165px;padding:14px 16px}.calculator{padding:22px 19px;border-radius:18px}.calculator h3{font-size:18px}.calc-fields{gap:15px}.calc-fields label{min-width:100%;font-size:12px}.calc-result{padding:15px;font-size:11px}.calc-result strong{font-size:25px}.fine-print{font-size:10px}.article{padding:26px 20px;border-radius:20px}.article-heading h1{font-size:27px;padding-right:42px}.article-heading .eyebrow{font-size:9px;letter-spacing:1px}.article-heading .favorite{top:34px;width:36px;height:36px}.article-meta{font-size:11px}.article h2{font-size:20px;margin:25px 0 22px}.original-content,.original-content p{font-size:15px;line-height:1.95}.original-content h3{font-size:21px;line-height:1.6}.original-content h4{font-size:18px}.source-figure{margin:24px -5px}.source-code{margin:21px -5px;border-radius:10px}.code-number{flex-basis:34px;padding:0 8px}.source-table{margin:24px -5px;border-radius:10px}.source-table td,.source-table th{padding:11px 13px}.article-pagination{gap:15px;margin-top:30px;padding-top:23px}.article-pagination a{font-size:12px}.article-pagination small{font-size:10px}.panel{padding:23px 20px;border-radius:18px}.panel h3{font-size:18px}.form-grid{grid-template-columns:1fr;gap:17px}.full{grid-column:auto}.form-grid label{font-size:12px}.field{font-size:13px}.record-grid{grid-template-columns:1fr}.record-controls .field{max-width:none;width:100%}.record-controls{width:100%}.record-controls .button{font-size:11px}.record-card{padding:23px;border-radius:17px}.lab-guide{display:block}.empty-state{padding:37px 20px;border-radius:18px;font-size:12px}.empty-state strong{font-size:18px}dialog{top:9vh;border-radius:20px}.search-input-wrap{padding:20px 18px;gap:12px}#global-search{font-size:14px}.search-footer{padding:15px 19px;font-size:10px}.search-footer>span{display:none}.search-result{padding:14px;font-size:13px}.search-result small{font-size:10px}.eyebrow{margin-bottom:17px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*::before,*::after{transition:none!important}}

/* Comfortable typography: system fonts, readable labels and balanced line lengths. */
html{font-size:16px;-webkit-text-size-adjust:100%;text-size-adjust:100%}
body{font-family:system-ui,-apple-system,BlinkMacSystemFont,'Segoe UI','Microsoft YaHei','PingFang SC','Noto Sans CJK SC',sans-serif;font-size:.9375rem;line-height:1.7}
h1,h2,h3{letter-spacing:normal;font-weight:600}
.hero h1{letter-spacing:-.025em;font-weight:600}
.brand{font-weight:600;letter-spacing:-.035em}
.brand small{font-size:.75rem;letter-spacing:normal;line-height:1.5}
.search-launch,.crumb,.top-actions,.tree-label{font-size:.875rem}
.search-launch{gap:8px;padding-left:14px;padding-right:14px}
.search-launch kbd{font-size:.6875rem}
.primary-nav a{font-size:.9375rem;min-height:48px;gap:10px;padding-left:14px;padding-right:14px}
.primary-nav small{font-size:.6875rem;padding:3px 5px;letter-spacing:0}
.tree-label span,.tree-number{font-size:.75rem}
.tree-group summary,.tree-group a{font-size:.875rem;line-height:1.6}
.tree-group summary{min-height:44px;padding:10px 12px;gap:7px}
.tree-group a{min-height:42px;padding:10px}
.sidebar-bottom{font-size:.8125rem;padding-left:10px;padding-right:10px}
.sidebar-bottom small,.footer{font-size:.75rem}
.crumb .workspace-name{margin-left:0;color:var(--muted)}
.hero p,.page-intro>p{font-size:1rem;line-height:1.85}
.hero p{max-width:32em}
.page-intro>p{max-width:52em}
.button,.hero-actions .button{font-size:.875rem;min-height:44px}
.hero-stats{font-size:.875rem}
.hero-stats>span:last-child{font-size:.8125rem}
.section-heading h2{font-size:1.5rem;line-height:1.5}
.section-heading small,.section-heading a{font-size:.8125rem}
.path-step strong{font-size:.9375rem;line-height:1.5}
.path-step small{font-size:.8125rem;line-height:1.6;display:block}
.path-panel{padding-top:24px;padding-bottom:24px}
.knowledge-card h3,.home-models h3{font-size:1.1875rem;font-weight:600;line-height:1.5}
.knowledge-card p,.home-models p{font-size:.9375rem;line-height:1.8}
.card-bottom{font-size:.8125rem}
.card-chapter{font-size:.6875rem;letter-spacing:.4px}
.notice{font-size:.875rem;line-height:1.85}
.chip{font-size:.875rem;min-height:42px;padding:8px 14px}
.field,textarea.field{font-size:1rem;line-height:1.65;min-height:46px}
.field::placeholder{color:var(--muted);opacity:1}
.provider-line{font-size:.8125rem}
.badge,.provider-line .badge{font-size:.75rem}
.model-card h3{font-size:1.375rem;font-weight:600;line-height:1.45;overflow-wrap:anywhere}
.positioning,.model-card p{font-size:.9375rem;line-height:1.8}
.model-card p{min-height:54px}
.model-card code{font-family:AtlasCode,Consolas,monospace;font-size:.75rem;line-height:1.8}
.billing-line,.model-metrics small{font-size:.8125rem;line-height:1.7}
.model-metrics{grid-template-columns:minmax(0,1.2fr) minmax(0,1fr);gap:12px}
.model-metrics strong{font-size:1rem;font-variant-numeric:tabular-nums}
.model-card-bottom a,.model-card-bottom .button{font-size:.8125rem}
.model-card-bottom .button{min-height:42px;padding:8px 12px}
.compare-bar,.compare-bar .button{font-size:.875rem;line-height:1.7}
.compare-bar .button{min-height:42px}
.comparison table{font-size:.875rem;line-height:1.8}
.comparison th,.comparison td{min-width:190px}
.calculator h3,.panel h3{font-size:1.25rem}
.calc-fields label,.form-grid label{font-size:.9375rem;line-height:1.65}
.calc-result{font-size:.875rem}
.calc-result small,.fine-print{font-size:.8125rem;line-height:1.85}
.article-layout{max-width:860px}
.article{padding:40px 48px}
.article-heading h1{font-size:2rem;line-height:1.5}
.article-meta{font-size:.875rem}
.article h2{font-size:1.375rem}
.original-content,.original-content p{font-size:1.125rem;line-height:1.9;letter-spacing:.015em}
.original-content p{margin-bottom:1.25em}
.original-content h3{font-size:1.625rem;line-height:1.6;font-weight:600;margin-top:1.6em;margin-bottom:.85em}
.original-content h4{font-size:1.25rem;font-weight:600;line-height:1.65}
.source-code,.original-content .code-row code{font-size:.875rem;line-height:1.85;letter-spacing:normal}
.code-label,.code-number{font-size:.8125rem}
.source-table table{font-size:1rem;line-height:1.85}
.article-pagination a{font-size:.9375rem}
.article-pagination small{font-size:.8125rem}
.lab-guide p,.lab-guide li{font-size:.9375rem;line-height:1.85}
.lab-guide .notice,.record-controls .button{font-size:.8125rem}
.record-card small,.record-card .scores,.record-note,.record-card button{font-size:.8125rem}
.record-card .answer{font-size:.9375rem;line-height:1.85}
.record-card button{min-height:44px}
.empty-state{font-size:.9375rem}
.search-result{font-size:1rem;line-height:1.6}
.search-result small,.search-footer{font-size:.8125rem}
#global-search{font-size:1rem}
#search-close{min-height:36px;font-size:.75rem;padding:6px 9px}
::selection{background:var(--accent);color:var(--text)}
@media(min-width:761px) and (max-width:1100px){
 .model-grid{grid-template-columns:1fr}
 .path-panel{grid-template-columns:repeat(2,minmax(0,1fr));gap:22px 0}
 .path-step:nth-child(2){border-right:0}
 .article{padding:32px}
}
@media(max-width:760px){
 .crumb{font-size:.875rem}
 .topbar{gap:6px}
 .topbar-leading{flex:1;overflow:hidden}
 .mobile-menu{margin-right:3px;width:44px;height:44px}
 .top-search{width:44px;height:44px}
 .hero{padding:26px 22px 24px}
 .hero h1{font-size:1.875rem;line-height:1.45;letter-spacing:-.025em}
 .hero p,.page-intro>p{font-size:.9375rem;line-height:1.85}
 .hero-actions .button{font-size:.875rem;padding:10px 17px;min-height:44px}
 .hero-stats{font-size:.8125rem;gap:12px 16px}
 .hero-stats strong{font-size:1.375rem}
 .hero-stats>span:last-child{font-size:.75rem}
 .section-heading{flex-wrap:wrap;gap:6px 14px;align-items:baseline}
 .section-heading h2{font-size:1.25rem}
 .section-heading small{font-size:.75rem;max-width:none;padding-top:0;text-align:left}
 .path-panel{padding:22px 6px;gap:22px 0}
 .path-step{padding:0 9px;gap:8px}
 .path-step strong{font-size:.875rem}
 .path-step small{font-size:.75rem}
 .step-number{width:26px;height:28px}
 .knowledge-card p,.home-models p{font-size:.9375rem}
 .page-intro h1{font-size:1.75rem;line-height:1.5}
 .notice{font-size:.8125rem;line-height:1.85}
 .chip{font-size:.8125rem;min-height:44px;padding:8px 13px}
 .model-card p{min-height:0}
 .compare-bar{font-size:.8125rem}
 .compare-bar .button{font-size:.8125rem;min-height:44px}
 .calc-results{gap:10px}
 .calc-result{padding:14px;font-size:.8125rem}
 .calc-result strong{font-size:1.5rem}
 .fine-print{font-size:.8125rem}
 .article{padding:26px 20px}
 .article-heading h1{font-size:1.625rem;line-height:1.5}
 .article-meta{font-size:.8125rem}
 .article-heading .favorite{top:34px;width:40px;height:40px}
 .original-content,.original-content p{font-size:1.0625rem;line-height:1.9;letter-spacing:.01em}
 .original-content h3{font-size:1.375rem}
 .original-content h4{font-size:1.1875rem}
 .source-table table{font-size:.9375rem}
 .article-pagination a{font-size:.875rem}
 .article-pagination small{font-size:.75rem}
 .panel{padding:24px 20px}
 .form-grid{gap:20px}
 .record-controls .button{font-size:.8125rem;min-height:44px}
 .search-result{font-size:.9375rem}
 .search-result small,.search-footer{font-size:.75rem}
}

@media(max-width:760px){.compare-bar{flex-direction:row;align-items:center;gap:8px;padding:12px;font-size:.75rem}.compare-bar>span{flex:1;white-space:nowrap}.compare-bar>div{flex-shrink:0;align-self:center;gap:6px!important}.compare-bar .button{font-size:.75rem;padding:8px 10px}.compare-selection{display:none}}
@media(max-width:360px){.hero{padding-left:20px;padding-right:20px}.hero h1{font-size:1.625rem}.hero-stats{gap:12px;font-size:.75rem}.hero-stats>span{gap:5px}.hero-stats strong{font-size:1.25rem}}