:root{--bg:#f4f6fa;--surface:#ffffff;--surface-soft:#f8fafc;--line:#e4e8ef;--line-strong:#d5dbe5;--text:#1f2937;--muted:#667085;--muted-light:#98a2b3;--blue:#123f75;--blue-dark:#0b2f5a;--blue-soft:#eaf0f8;--crimson:#8f1d3f;--gold:#c5a04d;--green:#14866d;--green-soft:#eaf8f4;--orange:#c56a16;--orange-soft:#fff4e8;--red:#c33d3d;--red-soft:#fff0f0;--shadow:0 10px 30px rgba(25,40,72,0.07)}.card-interaction-row{display:flex;align-items:center;justify-content:space-between;gap:10px;flex-wrap:wrap}.card-interaction-row .text-button{margin-top:0}.study-reactions{display:flex;align-items:center;gap:6px;flex-wrap:wrap;margin-top:11px}.study-reactions button{min-height:30px;display:inline-flex;align-items:center;gap:4px;border:1px solid #d6dee9;border-radius:999px;padding:4px 9px;color:#536174;background:#fff;font-family:inherit;font-size:12px;font-weight:700;cursor:pointer;transition:border-color .14s ease,color .14s ease,background .14s ease}.study-reactions button.active,.study-reactions button:hover{border-color:#86aee9;color:var(--blue-dark);background:var(--blue-soft)}.study-reactions button span{min-width:16px;color:inherit;text-align:center;font-size:11px}.study-reactions.large{margin-top:17px}.study-reactions.large button{min-height:36px;padding:7px 12px;font-size:13px}.study-reaction-strip{max-width:1000px;margin-top:28px;padding-top:24px;border-top:1px solid var(--line)}.study-reaction-strip .study-reactions{margin-top:0}.video-card-actions{display:flex;align-items:center;gap:8px;flex-wrap:wrap;margin-top:12px}.video-card-actions .study-reactions{margin-top:0}.tree-children .tree-children{margin-left:14px;padding-left:8px}.tree-row.level-3 .tree-main{height:38px}.tree-row.level-3 .tree-main span{font-size:14px}.logout-button{white-space:nowrap}*{box-sizing:border-box}html{min-width:320px}body,html{background:var(--bg)}body{margin:0;color:var(--text);font-family:-apple-system,BlinkMacSystemFont,PingFang SC,Microsoft YaHei,Noto Sans CJK SC,sans-serif}.article-header h1,.discussion-hero h1,.home-hero h1,.home-section .section-heading h2,.login-copy h1,.overview-header h1,.sidebar-heading h2{font-family:Georgia,Songti SC,STSong,"Noto Serif CJK SC",serif}button,input,select,textarea{font:inherit}a,button{-webkit-tap-highlight-color:transparent}button{cursor:pointer}a{color:inherit;text-decoration:none}.access-loading{min-height:100vh;display:grid;place-items:center;align-content:center;grid-gap:10px;gap:10px;color:var(--muted);background:var(--bg);font-size:13px}.spin{animation:spin .9s linear infinite}@keyframes spin{to{transform:rotate(1turn)}}.login-shell{min-height:100vh;display:grid;grid-template-columns:minmax(360px,.9fr) minmax(520px,1.1fr);background:#fff}.login-intro{position:relative;overflow:hidden;display:flex;flex-direction:column;justify-content:space-between;padding:clamp(34px,6vw,72px);color:#fff;background-color:#0b2f5a;background-image:linear-gradient(rgba(255,255,255,.07) 1px,transparent 0),linear-gradient(90deg,rgba(255,255,255,.07) 1px,transparent 0);background-size:30px 30px}.login-intro:after{content:"";position:absolute;right:-90px;bottom:-110px;width:360px;height:360px;border:1px solid rgba(255,255,255,.17);border-radius:50%;box-shadow:0 0 0 44px rgba(255,255,255,.04),0 0 0 96px rgba(255,255,255,.035)}.login-brand{position:relative;z-index:1;display:flex;align-items:center;gap:11px}.login-brand>span{width:44px;height:44px;display:grid;place-items:center;border:2px solid var(--gold);border-radius:4px;color:#f0d99e;background:#082746}.login-brand div{display:grid;grid-gap:2px;gap:2px}.login-brand strong{font-size:17px}.login-brand small{color:rgba(255,255,255,.7);font-size:11px}.login-copy{position:relative;z-index:1;max-width:590px;margin:auto 0}.login-copy .section-kicker{color:#dcc589}.login-copy h1{margin:13px 0 15px;font-size:clamp(36px,5vw,62px);line-height:1.12;letter-spacing:0}.login-copy .brush-title{position:relative;width:-moz-fit-content;width:fit-content;margin:16px 0 18px;color:#f7edd2;font-family:STXingkai,华文行楷,Xingkai SC,STKaiti,Kaiti SC,KaiTi,serif;font-size:clamp(54px,6.4vw,86px);font-weight:400;line-height:1.08;text-shadow:0 2px 0 rgba(4,20,37,.5),0 14px 34px rgba(0,0,0,.24);transform:rotate(-1deg)}.login-copy .brush-title:after{position:absolute;right:2%;bottom:-8px;left:4%;height:5px;border-radius:999px;background:#d8bd72;content:"";opacity:.42;transform:rotate(-1.5deg) scaleX(.86);transform-origin:left center}.login-copy p{max-width:470px;margin:0;color:rgba(255,255,255,.76);font-size:15px;line-height:1.85}.login-features{position:relative;z-index:1;display:flex;gap:20px;flex-wrap:wrap}.login-features div{display:flex;align-items:center;gap:7px;color:rgba(255,255,255,.82);font-size:12px}.login-panel{position:relative;display:grid;place-items:center;padding:40px 5vw;background:linear-gradient(180deg,rgba(23,105,224,.035),transparent 280px),#fff}.guest-contact-button{position:absolute;top:22px;right:24px;z-index:2}.contact-dialog-backdrop{position:fixed;inset:0;z-index:1000;display:grid;place-items:center;padding:20px;background:rgba(16,28,45,.5)}.contact-dialog{width:min(100%,480px);padding:22px;border-radius:10px;background:#ffffff;box-shadow:0 24px 70px rgba(16,28,45,.24)}.contact-empty{color:var(--muted);font-size:12px}.contact-text{margin-top:16px;color:var(--ink);font-size:14px;line-height:1.75;overflow-wrap:anywhere;white-space:pre-wrap}.login-card{width:min(520px,100%);border:1px solid var(--line);border-top:4px solid var(--crimson);border-radius:8px;background:#fff;box-shadow:0 22px 64px rgba(22,38,67,.11)}.legal-footer,.login-legal{display:flex;justify-content:center;gap:16px;flex-wrap:wrap;margin-top:18px;color:var(--muted);font-size:11px}.legal-footer a:hover,.login-legal a:hover{color:var(--blue)}.legal-page{min-height:100vh;padding-bottom:60px;background:#fff}.legal-header{height:72px;display:flex;align-items:center;gap:12px;padding:0 max(24px,calc((100vw - 980px) / 2));border-bottom:4px solid var(--crimson);color:#fff;background:#0b2f5a}.legal-header a{font-family:Georgia,Songti SC,serif;font-size:18px;font-weight:700}.legal-header span{color:rgba(255,255,255,.68);font-size:12px}.legal-document{width:min(900px,calc(100% - 40px));margin:0 auto;padding-top:54px}.legal-document h1{margin:10px 0;font-family:Georgia,Songti SC,serif;font-size:42px}.legal-update{margin:0 0 34px;color:var(--muted);font-size:12px}.legal-document section{padding:20px 0;border-top:1px solid var(--line)}.legal-document h2{margin:0 0 10px;font-size:20px}.legal-document section p{margin:0;color:#475467;line-height:1.9}.login-tabs{display:grid;grid-template-columns:repeat(4,1fr);padding:7px;border-bottom:1px solid var(--line);background:#f8fafc}.login-tabs button{height:42px;display:flex;align-items:center;justify-content:center;gap:6px;border:0;border-radius:6px;color:var(--muted);background:transparent;font-size:12px;font-weight:650}.login-tabs button.active{color:var(--blue);background:#fff;box-shadow:0 2px 10px rgba(24,48,79,.08)}.login-tabs button.guest-tab{color:#98a2b3;font-weight:600}.login-tabs button.guest-tab.active{color:#667085}.login-notice{border:1px solid #d7deea;border-radius:6px;color:#475467;background:#f8fafc;font-size:12px;line-height:1.6}.login-error,.login-notice{margin:14px 20px 0;padding:9px 11px}.login-error{border:1px solid #efc5c5;border-radius:6px;color:#8b2d2d;background:var(--red-soft);font-size:11px}.application-form,.application-status,.login-method{padding:25px 28px 28px}.login-method-heading{display:flex;align-items:flex-start;justify-content:space-between;gap:16px}.application-status h2,.login-method-heading h2{margin:0 0 6px;font-size:20px}.application-status p,.login-method-heading p{margin:0;color:var(--muted);font-size:12px;line-height:1.65}.login-badge{flex:none;padding:4px 7px;border-radius:999px;color:#87501d;background:var(--orange-soft);font-size:10px}.qr-stage{min-height:245px;display:grid;place-items:center;margin:22px 0 13px;border:1px solid var(--line);border-radius:8px;background:linear-gradient(135deg,rgba(23,105,224,.045),transparent 52%),#fafcff}.qr-code{position:relative;width:214px;height:214px;display:grid;place-items:center;border:10px solid #fff;border-radius:8px;background:#fff;box-shadow:0 8px 24px rgba(21,43,73,.09)}.qr-overlay{position:absolute;inset:0;display:grid;place-items:center;align-content:center;grid-gap:5px;gap:5px;color:#fff;background:rgba(18,55,93,.86)}.qr-overlay strong{font-size:15px}.qr-overlay span{color:rgba(255,255,255,.74);font-size:11px}.qr-placeholder{display:grid;justify-items:center;grid-gap:10px;gap:10px}.qr-placeholder,.qr-status{color:var(--muted);font-size:12px}.qr-status{min-height:20px;text-align:center}.login-refresh{width:100%;margin-top:10px}.application-form{display:grid;grid-gap:15px;gap:15px}.application-form label{display:grid;grid-gap:6px;gap:6px}.application-form label>span{color:#344054;font-size:12px;font-weight:700}.application-form input{width:100%;height:43px;border:1px solid #ccd5e1;border-radius:7px;padding:0 12px;color:var(--text);outline:0}.application-form input:focus{border-color:#78aaf0;box-shadow:0 0 0 3px rgba(23,105,224,.1)}.login-submit{width:100%;margin-top:3px}.guest-login-panel{display:grid;justify-items:center;grid-gap:14px;gap:14px;padding:38px 28px 42px;color:#667085;text-align:center}.guest-login-panel p{max-width:360px;margin:0;color:#667085;font-size:13px;line-height:1.75}.guest-entry-button{color:#667085;border-color:#d0d5dd;background:#f9fafb}.application-status{display:grid;justify-items:center;grid-gap:10px;gap:10px;padding-top:42px;padding-bottom:42px;text-align:center}.application-status-icon{width:54px;height:54px;display:grid;place-items:center;border-radius:50%}.application-status-icon.pending{color:#9a5a14;background:var(--orange-soft)}.application-status-icon.approved{color:var(--green);background:var(--green-soft)}.application-status-icon.rejected{color:var(--red);background:var(--red-soft)}.application-note{width:100%;padding:11px;border-radius:7px;color:#475467;background:var(--surface-soft);font-size:11px;line-height:1.6}.app-shell{min-height:100vh}.topbar{position:-webkit-sticky;position:sticky;top:0;z-index:40;height:70px;justify-content:space-between;gap:24px;padding:0 28px;border-bottom:1px solid var(--line);background:rgba(255,255,255,.96);-webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px)}.admin-state,.brand,.main-nav,.topbar,.topbar-actions,.topbar-left{display:flex;align-items:center}.topbar-left{min-width:0;gap:28px}.brand,.topbar-actions{gap:10px}.brand{flex:none}.brand-button{border:0;padding:0;color:inherit;background:transparent;font-family:inherit;text-align:left;cursor:pointer}.brand-icon{width:36px;height:36px;display:grid;place-items:center;border:2px solid var(--gold);border-radius:4px;color:#fff;background:#0b2f5a}.brand div{display:grid;grid-gap:1px;gap:1px}.brand strong{font-size:17px}.brand span{color:var(--muted);font-size:12px}.main-nav{min-width:0;gap:5px;overflow-x:auto;scrollbar-width:none;cursor:-webkit-grab;cursor:grab;overscroll-behavior-x:contain;touch-action:pan-x}.main-nav.dragging{cursor:-webkit-grabbing;cursor:grabbing;-webkit-user-select:none;-moz-user-select:none;user-select:none}.main-nav::-webkit-scrollbar{display:none}.main-nav button{flex:none;height:40px;padding:0 16px;border:0;border-bottom:2px solid transparent;border-radius:0;color:var(--muted);background:transparent;font-size:14px;font-weight:650;white-space:nowrap}.main-nav button.active,.main-nav button:hover{color:var(--blue);background:transparent;border-bottom-color:var(--crimson)}.global-search{width:min(270px,24vw);height:38px;display:flex;align-items:center;gap:8px;padding:0 11px;border:1px solid var(--line);border-radius:8px;color:var(--muted);background:var(--surface-soft)}.global-search:focus-within{border-color:#8db8f1;background:#fff;box-shadow:0 0 0 3px rgba(23,105,224,.09)}.global-search input{width:100%;min-width:0;border:0;outline:0;color:var(--text);background:transparent}.global-search input::placeholder{color:var(--muted-light)}.global-search button{width:22px;height:22px;display:grid;place-items:center;border:0;border-radius:5px;color:var(--muted);background:transparent}.avatar{width:34px;height:34px;flex:none;display:grid;place-items:center;border-radius:50%;color:#fff;background:#355c7d;font-size:13px;font-weight:750}.admin-state{gap:6px;color:var(--green);font-size:12px;white-space:nowrap}.workspace{width:min(1560px,100%);min-height:calc(100vh - 70px);display:grid;grid-template-columns:304px minmax(0,1fr);margin:0 auto}.workspace.full{grid-template-columns:minmax(0,1fr);max-width:1360px}.directory-sidebar{position:-webkit-sticky;position:sticky;top:70px;height:calc(100vh - 70px);display:flex;flex-direction:column;overflow:hidden;border-right:1px solid var(--line);background:var(--surface)}.sidebar-heading{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:22px 18px 15px}.sidebar-heading h2{margin:3px 0 0;font-size:22px}.section-kicker{display:block;color:var(--blue);font-size:11px;font-weight:850;letter-spacing:.1em;text-transform:uppercase}.directory-tree{flex:1 1;overflow-y:auto;padding:3px 10px 24px}.tree-group{display:grid;grid-gap:2px;gap:2px;margin-bottom:5px}.tree-row{position:relative;min-width:0;display:grid;grid-template-columns:minmax(0,1fr) auto;align-items:center;border-radius:7px;transition:background .13s ease}.tree-row:hover{background:#f5f8fc}.tree-row.selected{background:var(--blue-soft)}.tree-main{min-width:0;height:46px;display:flex;align-items:center;gap:8px;padding:0 9px;border:0;color:#344054;background:transparent;font-family:inherit;text-align:left}.tree-main svg{flex:none;color:#667085}.tree-main span{min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-size:15px;font-weight:520;line-height:1.45}.tree-main em{min-width:21px;margin-left:auto;padding:2px 5px;border-radius:999px;color:var(--muted);background:#edf0f4;text-align:center;font-size:11px;font-weight:600;font-style:normal}.tree-row:not(.child) .tree-main span{color:#263244;font-size:16px;font-weight:780;letter-spacing:0}.tree-row.selected .tree-main,.tree-row.selected .tree-main span,.tree-row.selected .tree-main svg{color:var(--blue-dark)}.tree-children{display:grid;grid-gap:1px;gap:1px;margin-left:23px;padding-left:10px;border-left:1px solid #dfe5ed}.tree-row.child .tree-main{height:42px;color:#475467}.tree-row.child .tree-main span{color:#475467;font-size:15px;font-weight:540}.tree-row.child .tree-main svg{width:15px;color:#8492a6}.tree-row.child .tree-main em{background:transparent}.tree-actions{display:none;align-items:center;gap:1px;padding-right:5px}.tree-row:hover .tree-actions{display:flex}.tree-actions button{width:23px;height:23px;display:grid;place-items:center;border:0;border-radius:5px;color:#667085;background:#fff}.tree-actions button:hover{color:var(--blue);background:#e8f1ff}.sidebar-summary{display:grid;grid-gap:8px;gap:8px;padding:14px 16px 18px;border-top:1px solid var(--line);background:#fbfcfe}.sidebar-summary div{display:grid;grid-template-columns:18px minmax(0,1fr) auto;align-items:center;grid-gap:7px;gap:7px;color:var(--muted);font-size:11px}.sidebar-summary svg{color:#8091a7}.sidebar-summary strong{color:#344054;font-size:12px}.content-area{min-width:0;padding:28px 34px 70px}.review-preview-banner{display:flex;align-items:center;gap:8px;margin:0 0 14px;padding:10px 12px;border:1px solid #efd19c;border-radius:7px;color:#8a5a16;background:#fffaf0;font-size:12px;line-height:1.6}.home-view{display:grid;grid-gap:34px;gap:34px;padding-bottom:40px}.home-hero{position:relative;overflow:hidden;display:grid;grid-template-columns:minmax(0,1.45fr) minmax(280px,.55fr);grid-gap:28px;gap:28px;min-height:410px;padding:clamp(32px,5vw,58px);border-radius:8px;color:#fff;background-color:#0b2f5a;background-image:linear-gradient(rgba(255,255,255,.075) 1px,transparent 0),linear-gradient(90deg,rgba(255,255,255,.075) 1px,transparent 0);background-size:30px 30px}.home-hero:after{content:"";position:absolute;right:-70px;bottom:-120px;width:380px;height:380px;border:1px solid rgba(255,255,255,.18);border-radius:50%;box-shadow:0 0 0 45px rgba(255,255,255,.06),0 0 0 95px rgba(255,255,255,.035)}.home-hero-copy{position:relative;z-index:1;align-self:center}.hero-seal{width:52px;height:52px;display:grid;place-items:center;margin-bottom:18px;border:2px solid var(--gold);border-radius:5px;color:#f0d99e;font-family:Songti SC,STSong,serif;font-size:25px;font-weight:800}.home-hero .section-kicker{color:#dcc589}.home-hero h1{max-width:720px;margin:13px 0 16px;font-size:clamp(44px,5.5vw,68px);line-height:1.12;font-weight:700;letter-spacing:0}.home-hero-copy>p{max-width:680px;margin:0;color:rgba(255,255,255,.72);font-size:17px;line-height:1.85}.home-hero-actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:25px}.home-hero .button.primary{color:#fff;background:var(--crimson);border-color:var(--crimson)}.home-hero .button.primary:hover{background:#74152f}.home-outline{color:#fff;border-color:rgba(255,255,255,.32);background:rgba(255,255,255,.07)}.home-hero-panel{position:relative;z-index:1;align-self:center;display:grid;grid-gap:1px;gap:1px;padding:13px;border-radius:8px;border:1px solid rgba(197,160,77,.34);background:rgba(4,24,48,.4);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px)}.home-hero-panel .section-kicker{margin:8px 8px 15px}.hero-stat{display:flex;align-items:baseline;justify-content:space-between;gap:12px;padding:13px 10px;border-top:1px solid rgba(255,255,255,.1)}.hero-stat strong{color:#e2c77f;font-size:36px}.hero-stat span{color:rgba(255,255,255,.78);font-size:13px}.home-section{display:grid;grid-gap:4px;gap:4px}.home-section .section-heading h2,.video-home-section .section-heading h2{font-size:30px;font-weight:650}.home-content-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));grid-gap:13px;gap:13px}.home-content-card{min-height:235px;display:flex;flex-direction:column;align-items:flex-start;padding:19px;border:1px solid var(--line);border-top:4px solid var(--crimson);border-radius:8px;background:#fff;transition:box-shadow .14s ease,border-color .14s ease}.home-content-card:hover{border-color:#b7c8dc;box-shadow:var(--shadow)}.home-card-index{color:var(--crimson);font-size:12px;font-weight:850;letter-spacing:.09em}.home-content-card h3{margin:13px 0 8px;font-size:20px;font-weight:800}.home-content-card p{margin:0 0 14px;color:var(--muted);font-size:14px;line-height:1.7}.home-card-meta{display:flex;gap:10px;margin-top:auto;color:var(--muted-light);font-size:11px}.text-button{display:inline-flex;align-items:center;gap:5px;margin-top:15px;border:0;padding:0;color:var(--blue);background:transparent;font-size:13px;font-weight:750}.video-home-section{padding-top:28px;border-top:1px solid var(--line)}.home-video-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));grid-gap:13px;gap:13px}.home-video-card{display:grid;grid-template-columns:150px minmax(0,1fr);grid-gap:15px;gap:15px;padding:13px;border:1px solid var(--line);border-radius:8px;background:#fff}.video-card-visual{min-height:105px;display:grid;place-items:center;border-radius:7px;color:#e2c77f;background:#0b2f5a}.home-video-card h3{margin:6px 0 7px;font-size:18px}.home-video-card p{margin:0;color:var(--muted);font-size:13px;line-height:1.6}.video-library-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));grid-gap:14px;gap:14px}.video-library-card{overflow:hidden;border:1px solid var(--line);border-radius:8px;background:#fff}.video-library-visual{min-height:150px;display:grid;place-items:center;align-content:center;grid-gap:8px;gap:8px;color:#e2c77f;background:#0b2f5a}.video-library-visual span{font-size:10px;font-weight:850;letter-spacing:.13em}.video-library-card>div:last-child{padding:15px}.video-library-card h3{margin:0 0 7px;font-size:15px}.video-library-card p{margin:0 0 12px;color:var(--muted);font-size:11px;line-height:1.65}.discussion-view{display:grid;grid-gap:22px;gap:22px;padding-bottom:40px}.discussion-hero{display:flex;align-items:flex-end;justify-content:space-between;gap:30px;padding:30px 34px;border-radius:8px;color:#fff;background:#0b2f5a}.discussion-hero .section-kicker{color:#dcc589}.discussion-hero h1{margin:9px 0 8px;font-size:42px;font-weight:820}.discussion-hero p{margin:0;color:rgba(255,255,255,.7)}.discussion-hero-stat{display:grid;justify-items:end}.discussion-hero-stat strong{color:#e2c77f;font-size:38px}.discussion-hero-stat span{color:rgba(255,255,255,.65);font-size:11px}.discussion-card,.discussion-compose,.discussion-detail-card,.discussion-reply{border:1px solid var(--line);border-radius:8px;background:#fff}.discussion-compose{padding:20px}.discussion-compose form{display:grid;grid-gap:10px;gap:10px}.discussion-compose input,.discussion-compose textarea,.discussion-reply-form textarea{width:100%;border:1px solid #ccd5e1;border-radius:7px;padding:10px 11px;color:var(--text);outline:0;resize:vertical}.discussion-compose input:focus,.discussion-compose textarea:focus,.discussion-reply-form textarea:focus{border-color:#78aaf0;box-shadow:0 0 0 3px rgba(23,105,224,.1)}.discussion-compose-footer{display:flex;align-items:center;justify-content:space-between}.discussion-compose-footer span{color:var(--muted);font-size:11px}.discussion-list{display:grid;grid-gap:11px;gap:11px}.discussion-card{display:grid;grid-template-columns:minmax(0,1fr) auto;grid-gap:18px;gap:18px;padding:17px 18px}.discussion-card h3{margin:0 0 8px;font-size:16px}.discussion-card-main>p{display:-webkit-box;overflow:hidden;margin:0 0 9px;color:var(--muted);font-size:12px;line-height:1.7;-webkit-box-orient:vertical;-webkit-line-clamp:2}.discussion-card-heading{display:flex;align-items:flex-start;justify-content:space-between;gap:12px}.discussion-card-meta{display:flex;gap:10px;color:var(--muted-light);font-size:10px}.discussion-card-actions{display:flex;align-items:center;gap:9px}.discussion-card-actions button{display:inline-flex;align-items:center;gap:4px;border:0;padding:5px;color:var(--muted);background:transparent;font-size:11px}.discussion-detail-card{padding:24px}.discussion-detail-card h1{margin:18px 0 13px;font-size:28px}.discussion-post-meta{display:flex;align-items:center;gap:10px}.discussion-post-meta>div{display:grid;grid-gap:3px;gap:3px}.discussion-post-meta strong{font-size:13px}.discussion-post-meta span{color:var(--muted);font-size:11px}.discussion-post-body{color:#344054;font-size:14px;line-height:1.9;white-space:pre-wrap}.moderation-inline-actions{display:flex;gap:7px;flex-wrap:wrap;margin-top:12px}.discussion-replies{display:grid;grid-gap:10px;gap:10px;margin-top:22px}.discussion-reply{padding:15px}.discussion-reply>p{margin:10px 0 0;color:#344054;line-height:1.75;white-space:pre-wrap}.discussion-reply-form{display:grid;grid-gap:9px;gap:9px;margin-top:8px;padding:15px;border:1px solid var(--line);border-radius:8px;background:#fff}.discussion-reply-form button{justify-self:end}.profile-preview{display:flex;align-items:center;gap:12px;margin-bottom:4px;padding:13px;border-radius:8px;background:var(--surface-soft)}.profile-preview>div{display:grid;grid-gap:3px;gap:3px}.profile-preview>div span{color:var(--muted);font-size:11px}.avatar.large{width:48px;height:48px;font-size:17px}.avatar-button{border:0;padding:0}.online-summary{display:flex;align-items:baseline;justify-content:center;gap:8px;padding:18px;border-bottom:1px solid var(--line)}.online-summary strong{color:var(--green);font-size:34px}.online-summary span:last-child{color:var(--muted);font-size:11px}.online-pulse{width:9px;height:9px;border-radius:50%;background:#22a884;box-shadow:0 0 0 5px rgba(34,168,132,.12)}.online-user-list{display:grid;grid-gap:8px;gap:8px;margin-top:14px}.online-user-list>div{display:flex;align-items:center;gap:10px;padding:10px;border:1px solid var(--line);border-radius:7px}.online-user-list>div>div{display:grid;grid-gap:2px;gap:2px}.online-user-list span{color:var(--muted);font-size:11px}.report-list{display:grid;grid-gap:10px;gap:10px}.report-item{display:grid;grid-template-columns:minmax(0,1fr) auto;grid-gap:14px;gap:14px;align-items:center;padding:13px;border:1px solid var(--line);border-left:3px solid var(--crimson);border-radius:7px}.report-item strong{font-size:12px}.report-item p{margin:6px 0;color:#344054;font-size:12px}.report-item span{color:var(--muted);font-size:10px}.content-surface{max-width:1120px;margin:0 auto}.article-header,.content-toolbar,.knowledge-card-actions,.knowledge-card-title,.overview-header,.resource-actions,.section-heading{display:flex;align-items:center;justify-content:space-between;gap:18px}.overview-header{align-items:flex-end;padding:10px 2px 24px}.article-header h1,.overview-header h1{margin:7px 0 9px;font-size:clamp(31px,3.2vw,42px);line-height:1.25;letter-spacing:0}.article-header>p,.overview-header p{margin:0;color:var(--muted);line-height:1.7}.breadcrumb{margin:0;color:var(--blue)!important;font-size:12px;font-weight:750}.overview-stats{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));grid-gap:12px;gap:12px;margin-bottom:18px}.overview-stats>div{display:grid;grid-template-columns:30px minmax(0,1fr) auto;align-items:center;grid-gap:7px;gap:7px;min-height:72px;padding:14px 16px;border:1px solid var(--line);border-radius:8px;background:var(--surface)}.overview-stats svg{color:var(--blue)}.overview-stats span{color:var(--muted);font-size:12px}.overview-stats strong{font-size:22px}.knowledge-list{display:grid;grid-gap:10px;gap:10px}.knowledge-card{display:grid;grid-template-columns:44px minmax(0,1fr) auto;grid-gap:14px;gap:14px;align-items:center;padding:17px 18px;border:1px solid var(--line);border-radius:8px;background:var(--surface);transition:border-color .14s ease,box-shadow .14s ease}.knowledge-card:hover{border-color:#b8cae4;box-shadow:var(--shadow)}.knowledge-card-icon{width:40px;height:40px;display:grid;place-items:center;border-radius:8px;color:var(--blue);background:var(--blue-soft)}.knowledge-card-main{min-width:0}.knowledge-card-title h3{margin:0;font-size:19px}.knowledge-card-title>span{flex:none;color:var(--muted-light);font-size:11px}.knowledge-card-main>p{margin:7px 0 9px;overflow:hidden;color:var(--muted);font-size:14px;line-height:1.6;text-overflow:ellipsis;white-space:nowrap}.knowledge-card-meta{display:flex;gap:14px;color:var(--muted);font-size:12px}.knowledge-card-meta span{display:inline-flex;align-items:center;gap:5px}.knowledge-card-actions{justify-content:flex-end;gap:7px}.content-toolbar{margin-bottom:16px}.back-button{display:inline-flex;align-items:center;gap:6px;border:0;padding:7px 0;color:var(--blue);background:transparent;font-size:12px;font-weight:700}.toolbar-actions{display:flex;gap:7px}.article-header{display:block;padding:8px 0 23px;border-bottom:1px solid var(--line)}.article-header h1{max-width:860px}.meta-line{display:flex;gap:9px;flex-wrap:wrap;margin-top:14px}.count-label,.meta-line span{display:inline-flex;align-items:center;min-height:24px;padding:3px 8px;border-radius:999px;color:var(--muted);background:#eef2f6;font-size:11px}.markdown-content{max-width:920px;padding:27px 0 12px;color:#2d3748;font-size:15px;line-height:1.95;overflow-wrap:anywhere}.markdown-content h1,.markdown-content h2,.markdown-content h3,.markdown-content h4{color:#172033;line-height:1.4}.markdown-content h1{margin:1.25em 0 .6em;font-size:27px}.markdown-content h2{margin:1.2em 0 .5em;padding-bottom:7px;border-bottom:1px solid var(--line);font-size:21px}.markdown-content h3{margin:1.05em 0 .45em;font-size:18px}.markdown-content p{margin:.7em 0}.markdown-content ol,.markdown-content ul{margin:.7em 0;padding-left:1.7em}.markdown-content li{margin:.2em 0}.markdown-content blockquote{margin:1em 0;padding:11px 15px;border-left:3px solid var(--blue);color:#475467;background:#f3f7fd}.markdown-content table{width:100%;margin:1em 0;border-collapse:collapse}.markdown-content img{display:block;width:auto;max-width:min(100%,520px);max-height:390px;height:auto;margin:18px auto 22px;border:1px solid #d8e0ea;border-radius:8px;background:#ffffff;object-fit:contain}.embedded-svg{width:100%;display:flex;justify-content:center;margin:18px 0 22px;overflow-x:auto}.embedded-svg svg{max-width:min(100%,560px);height:auto}.markdown-content td,.markdown-content th{padding:9px 11px;border:1px solid var(--line);text-align:left}.markdown-content th{background:#f7f9fc}.markdown-content code{padding:2px 5px;border-radius:4px;color:#8b3d20;background:#f7efe9;font-family:SFMono-Regular,Consolas,monospace;font-size:.9em}.markdown-content pre{overflow-x:auto;padding:14px;border-radius:7px;color:#f5f7fa;background:#202c3b}.markdown-content pre code{padding:0;color:inherit;background:transparent}.math-diagram{overflow:hidden;margin:18px 0 22px;border:1px solid #d8e0ea;border-radius:8px;background:linear-gradient(180deg,#ffffff,#f8fbff),#ffffff}.math-diagram-svg{display:block;width:100%;max-height:320px;padding:12px 14px 4px}.math-diagram figcaption{padding:0 16px 13px;color:#667085;font-size:13px;text-align:center}.markdown-content .katex-display{overflow-x:auto;overflow-y:hidden;padding:7px 0}.markdown-content .katex{font-size:1.08em}.content-section{max-width:1000px;margin-top:28px;padding-top:24px;border-top:1px solid var(--line)}.section-heading{margin-bottom:14px}.section-heading h2{margin:4px 0 0;font-size:20px}.video-frame,.video-player{width:100%;max-height:620px;border:0;border-radius:8px;background:#0d131b}.video-frame{min-height:500px}.pdf-preview{width:100%;min-height:680px;border:1px solid var(--line);border-radius:8px;background:#ffffff}.video-link{min-height:78px;display:flex;align-items:center;gap:12px;padding:16px;border:1px solid #bcd4f4;border-radius:8px;color:var(--blue-dark);background:var(--blue-soft)}.video-link span{min-width:0;display:grid;grid-gap:3px;gap:3px}.video-link small{overflow:hidden;color:var(--muted);text-overflow:ellipsis;white-space:nowrap}.resource-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));grid-gap:10px;gap:10px}.resource-item{display:grid;grid-template-columns:38px minmax(0,1fr);grid-gap:11px;gap:11px;align-items:center;padding:14px;border:1px solid var(--line);border-radius:8px;background:var(--surface)}.resource-icon{width:36px;height:36px;display:grid;place-items:center;border-radius:7px;color:var(--blue);background:var(--blue-soft)}.resource-info{min-width:0;display:grid;grid-gap:4px;gap:4px}.resource-info strong{overflow:hidden;font-size:13px;text-overflow:ellipsis;white-space:nowrap}.resource-info span{color:var(--muted);font-size:11px}.resource-actions{grid-column:2;justify-content:flex-start}.comments-section{max-width:920px}.comment-count{display:inline-flex;align-items:center;justify-content:center;min-width:24px;height:24px;margin-left:8px;padding:0 7px;border-radius:999px;color:var(--blue);background:var(--blue-soft);font-size:11px;vertical-align:middle}.comment-form{display:grid;grid-gap:10px;gap:10px;margin-bottom:16px;padding:14px;border:1px solid var(--line);border-radius:8px;background:var(--surface)}.comment-form-row label{width:min(220px,100%);height:36px;display:flex;align-items:center;gap:7px;padding:0 10px;border:1px solid var(--line);border-radius:7px;color:var(--muted);background:var(--surface-soft)}.comment-form-row input{width:100%;border:0;outline:0;color:var(--text);background:transparent}.comment-form textarea,.reply-form textarea{width:100%;border:1px solid var(--line-strong);border-radius:7px;padding:10px 11px;color:var(--text);background:#fff;outline:0;resize:vertical;line-height:1.65}.comment-form textarea:focus,.reply-form textarea:focus{border-color:#78aaf0;box-shadow:0 0 0 3px rgba(23,105,224,.1)}.comment-form-footer{display:flex;align-items:center;justify-content:space-between;gap:12px}.comment-form-footer>span{color:var(--muted);font-size:11px}.moderation-note{display:flex;align-items:center;gap:8px;margin-bottom:14px;padding:10px 12px;border:1px solid #cfdfd9;border-radius:7px;color:#266454;background:var(--green-soft);font-size:11px}.comment-list{display:grid;grid-gap:13px;gap:13px}.comment-thread{padding:15px;border:1px solid var(--line);border-radius:8px;background:var(--surface)}.comment-thread.status-pending{border-left:3px solid var(--orange)}.comment-thread.status-rejected{border-left:3px solid #d65c5c;background:#fffafa}.comment-item{display:grid;grid-template-columns:36px minmax(0,1fr);grid-gap:11px;gap:11px}.comment-item.reply{grid-template-columns:30px minmax(0,1fr)}.comment-avatar{width:36px;height:36px;display:grid;place-items:center;border-radius:50%;color:#fff;background:#5478a8;font-size:13px;font-weight:750}.comment-item.reply .comment-avatar{width:30px;height:30px;background:#7890ad;font-size:11px}.comment-content{min-width:0}.comment-meta{display:flex;align-items:center;justify-content:space-between;gap:12px}.comment-meta>div{min-width:0;display:flex;align-items:center;gap:7px;flex-wrap:wrap}.comment-meta strong{color:#253247;font-size:13px}.comment-meta time,.reply-target{color:var(--muted-light);font-size:11px}.reply-target{color:var(--blue)}.comment-content>p{margin:7px 0;color:#344054;font-size:13px;line-height:1.75;white-space:pre-wrap;overflow-wrap:anywhere}.comment-status{flex:none;display:inline-flex;align-items:center;gap:4px;padding:3px 7px;border-radius:999px;font-size:10px}.comment-status.pending{color:#9a5a14;background:var(--orange-soft)}.comment-status.approved{color:var(--green);background:var(--green-soft)}.comment-status.rejected{color:var(--red);background:var(--red-soft)}.moderation-reason{margin:5px 0 7px;padding:7px 9px;border-radius:5px;color:#87501d;background:var(--orange-soft);font-size:11px}.comment-actions{display:flex;align-items:center;gap:12px;margin-top:7px}.comment-actions button{display:inline-flex;align-items:center;gap:4px;border:0;padding:0;color:var(--muted);background:transparent;font-size:11px}.comment-actions button.liked,.comment-actions button:hover{color:var(--blue)}.comment-actions button.approve{color:var(--green)}.comment-actions button.delete,.comment-actions button.reject{color:var(--red)}.comment-replies{display:grid;grid-gap:12px;gap:12px;margin:13px 0 0 47px;padding:12px 0 0;border-top:1px solid #edf0f4}.reply-form{display:grid;grid-gap:8px;gap:8px;margin-top:10px;padding:10px;border-radius:7px;background:var(--surface-soft)}.reply-form>div{display:flex;justify-content:flex-end;gap:7px}.comment-empty{min-height:110px;place-items:center;grid-gap:7px;gap:7px;border:1px dashed var(--line-strong);border-radius:8px;color:var(--muted);background:var(--surface-soft);font-size:12px}.comment-empty,.empty-block{display:grid;align-content:center}.empty-block{min-height:270px;place-items:center;grid-gap:8px;gap:8px;padding:34px;border:1px dashed #cbd3df;border-radius:8px;color:var(--muted);background:rgba(255,255,255,.66);text-align:center}.empty-block strong{color:#344054}.empty-block span{font-size:12px}.empty-icon{width:50px;height:50px;display:grid;place-items:center;border-radius:10px;color:var(--blue);background:var(--blue-soft)}.button{min-height:38px;display:inline-flex;align-items:center;justify-content:center;gap:6px;padding:8px 13px;border:1px solid transparent;border-radius:7px;font-size:12px;font-weight:680;transition:background .13s ease,border-color .13s ease}.button.primary{color:#fff;background:var(--blue);border-color:var(--blue)}.button.primary:hover{background:var(--blue-dark)}.button.secondary{color:var(--blue-dark);background:var(--blue-soft);border-color:#c5daf7}.button.ghost{color:#344054;background:#fff;border-color:var(--line-strong)}.button.danger{color:var(--red);background:var(--red-soft);border-color:#f1c8c8}.button.small{min-height:32px;padding:6px 10px;font-size:11px}.icon-button{width:34px;height:34px;display:grid;place-items:center;padding:0;border:1px solid var(--line);border-radius:7px;color:#475467;background:#fff}.icon-button:hover{color:var(--blue);border-color:#bcd4f4;background:var(--blue-soft)}.modal-backdrop{position:fixed;inset:0;z-index:100;display:grid;place-items:center;padding:22px;background:rgba(15,23,42,.46);-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px)}.modal-backdrop.elevated{z-index:240}.modal{width:min(520px,100%);max-height:calc(100vh - 44px);overflow:hidden;border:1px solid var(--line);border-radius:8px;background:#fff;box-shadow:0 24px 70px rgba(15,23,42,.2)}.modal.large{width:min(900px,100%)}.modal-header{min-height:58px;display:flex;align-items:center;justify-content:space-between;padding:0 18px;border-bottom:1px solid var(--line)}.modal-header h2{margin:0;font-size:17px}.modal-body{max-height:calc(100vh - 103px);overflow-y:auto;padding:20px}.modal-form{display:grid;grid-gap:15px;gap:15px}.modal-form label{display:grid;grid-gap:6px;gap:6px}.modal-form label>span{color:#344054;font-size:12px;font-weight:720}.modal-form input,.modal-form select,.modal-form textarea{width:100%;border:1px solid #ccd5e1;border-radius:7px;padding:10px 11px;color:var(--text);background:#fff;outline:0}.modal-form input:focus,.modal-form select:focus,.modal-form textarea:focus{border-color:#78aaf0;box-shadow:0 0 0 3px rgba(23,105,224,.1)}.modal-form textarea{resize:vertical;line-height:1.7}.code-editor{min-height:320px;font-family:SFMono-Regular,Consolas,monospace;font-size:13px}.form-grid{display:grid;grid-gap:12px;gap:12px}.form-grid.two-column{grid-template-columns:repeat(2,minmax(0,1fr))}.checkbox-field{grid-template-columns:18px minmax(0,1fr);align-items:center;gap:8px}.checkbox-field input{width:16px;height:16px;margin:0}.checkbox-field>span{font-size:12px;font-weight:700}.checkbox-field small{grid-column:2;color:var(--muted);font-size:11px;line-height:1.5}.switch-field{display:grid;grid-template-columns:38px minmax(0,1fr);align-items:center;grid-gap:8px;gap:8px}.switch-field>input{position:absolute;width:1px;height:1px;opacity:0;pointer-events:none}.switch-track{position:relative;width:38px;height:22px;border-radius:999px;background:#cbd5e1;transition:background .16s ease}.switch-thumb{position:absolute;top:3px;left:3px;width:16px;height:16px;border-radius:50%;background:#fff;box-shadow:0 1px 3px rgba(15,23,42,.2);transition:transform .16s ease}.switch-field input:checked+.switch-track{background:#2563a8}.switch-field input:checked+.switch-track .switch-thumb{transform:translateX(16px)}.switch-label{color:#344054;font-size:12px;font-weight:700}.switch-field small{grid-column:2;color:var(--muted);font-size:11px;line-height:1.5}.toggle-switch{display:inline-flex;align-items:center;gap:6px;padding:0;border:0;background:transparent;font-family:inherit;cursor:pointer}.toggle-switch:disabled{cursor:default;opacity:.65}.toggle-track{position:relative;width:36px;height:20px;border-radius:999px;background:#cbd5e1;transition:background .16s ease}.toggle-thumb{position:absolute;top:3px;left:3px;width:14px;height:14px;border-radius:50%;background:#fff;box-shadow:0 1px 3px rgba(15,23,42,.2);transition:transform .16s ease}.toggle-switch.on .toggle-track{background:#2563a8}.toggle-switch.on .toggle-thumb{transform:translateX(16px)}.toggle-label{color:#64748b;font-size:12px;font-weight:700}.toggle-switch.on .toggle-label{color:#2563a8}.editor-section{display:grid;grid-gap:12px;gap:12px;padding:14px;border:1px solid var(--line);border-radius:8px;background:var(--surface-soft)}.chapter-permission-groups{display:grid;grid-gap:14px;gap:14px}.chapter-permission-groups>section{display:grid;grid-gap:8px;gap:8px}.chapter-permission-groups h4{margin:0;color:#344054;font-size:13px}.chapter-permission-heading{display:flex;align-items:center;justify-content:space-between;gap:10px}.module-select-all{display:inline-flex;align-items:center;gap:6px;color:#475467;font-size:12px;font-weight:700}.module-select-all input{width:15px;height:15px;margin:0}.chapter-permission-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(180px,1fr));grid-gap:7px;gap:7px}.chapter-permission-grid .checkbox-field{padding:8px 10px;border:1px solid #dbe3ee;border-radius:6px;background:#fff}.file-input{padding:12px;border:1px dashed #b9c5d5;border-radius:7px;background:#fff}.file-input>span{display:flex;align-items:center;gap:6px}.file-input input{padding:0;border:0}.file-input small,.form-tip{color:var(--muted);font-size:11px;line-height:1.55}.existing-files{display:grid;grid-gap:6px;gap:6px}.existing-files label{display:grid;grid-template-columns:18px 18px minmax(0,1fr) auto;align-items:center;grid-gap:7px;gap:7px;padding:8px 10px;border:1px solid var(--line);border-radius:6px;background:#fff;font-size:12px}.existing-files input{width:14px;height:14px;margin:0}.existing-files span{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.existing-files small{color:var(--muted)}.application-list{display:grid;grid-gap:10px;gap:10px}.application-item{display:grid;grid-template-columns:minmax(0,1fr) auto auto;align-items:center;grid-gap:14px;gap:14px;padding:13px 14px;border:1px solid var(--line);border-radius:8px;background:#fff}.application-item.status-pending{border-left:3px solid var(--orange)}.application-person{min-width:0;display:flex;align-items:center;gap:10px}.application-person>div{min-width:0;display:grid;grid-gap:3px;gap:3px}.application-person strong{font-size:13px}.application-person span{overflow:hidden;color:var(--muted);font-size:11px;text-overflow:ellipsis;white-space:nowrap}.application-actions{flex-wrap:wrap;gap:6px}.application-actions,.modal-actions{display:flex;justify-content:flex-end}.modal-actions{gap:8px}.sticky-actions{position:-webkit-sticky;position:sticky;bottom:-20px;margin:0 -20px -20px;padding:14px 20px;border-top:1px solid var(--line);background:rgba(255,255,255,.96);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}.toast{position:fixed;right:22px;bottom:22px;z-index:120;max-width:min(380px,calc(100vw - 44px));padding:12px 15px;border:1px solid #c7ddd7;border-radius:7px;color:#1f4d43;background:#f0faf7;box-shadow:var(--shadow);font-size:12px}.toast.error{color:#7a2626;background:#fff1f1;border-color:#efc5c5}.mobile-only,.sidebar-backdrop{display:none}@media (max-width:1100px){.workspace{grid-template-columns:270px minmax(0,1fr)}.content-area{padding-right:22px;padding-left:22px}.main-nav{gap:1px}.main-nav button{padding:0 9px;font-size:12px}.global-search{width:220px}.resource-grid{grid-template-columns:1fr}.home-content-grid,.video-library-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}@media (max-width:900px){.login-shell{grid-template-columns:1fr}.login-intro{min-height:300px;padding:30px}.login-copy{margin:34px 0 24px}.login-copy h1{max-width:600px;font-size:36px}.login-panel{padding:28px 18px 50px}}@media (max-width:820px){.topbar{height:60px;padding:0 13px;-webkit-backdrop-filter:none;backdrop-filter:none;background:#fff}.main-nav{position:fixed;right:0;bottom:0;left:0;z-index:90;width:100%;max-width:100vw;display:flex;flex-wrap:nowrap;gap:4px;height:calc(58px + env(safe-area-inset-bottom));padding:5px 8px calc(5px + env(safe-area-inset-bottom));border-top:1px solid var(--line);border-bottom:0;background:rgba(255,255,255,.97);overflow-x:auto;overflow-y:hidden;scroll-snap-type:x proximity;-webkit-overflow-scrolling:touch;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px)}.main-nav button{flex:0 0 auto;min-width:max(72px,19vw);height:48px;padding:0 10px;border-top:2px solid transparent;border-bottom-color:transparent;border-radius:7px;font-size:12px;scroll-snap-align:center}.main-nav button.active,.main-nav button:hover{border-top-color:var(--crimson)}.admin-state,.brand span,.topbar-actions .button span{display:none}.mobile-only{display:grid}.topbar-left{gap:10px}.topbar-actions{gap:6px}.global-search{width:min(180px,36vw)}.workspace{min-height:calc(100vh - 60px);display:block}.directory-sidebar{position:fixed;top:60px;bottom:calc(58px + env(safe-area-inset-bottom));left:0;z-index:70;width:min(310px,88vw);height:auto;transform:translateX(-102%);transition:transform .18s ease;box-shadow:18px 0 44px rgba(20,32,55,.14)}.directory-sidebar.open{transform:translateX(0)}.sidebar-backdrop{position:fixed;inset:60px 0 calc(58px + env(safe-area-inset-bottom));z-index:60;display:block;border:0;background:rgba(15,23,42,.28)}.content-area{padding:20px 14px calc(100px + env(safe-area-inset-bottom))}.toast{bottom:calc(74px + env(safe-area-inset-bottom))}.home-hero{grid-template-columns:1fr;min-height:0;padding:30px 24px}.home-hero h1{font-size:38px}.home-hero-copy>p{font-size:15px}.home-hero-panel{grid-template-columns:repeat(3,minmax(0,1fr))}.home-hero-panel .section-kicker{grid-column:1/-1}.hero-stat{display:grid;justify-items:center}.home-content-grid,.home-video-grid,.video-library-grid{grid-template-columns:1fr}.overview-header{align-items:flex-start;flex-direction:column}.overview-stats{grid-template-columns:1fr}.knowledge-card{grid-template-columns:40px minmax(0,1fr)}.knowledge-card-actions{grid-column:2;justify-content:flex-start}.knowledge-card-title{align-items:flex-start}.knowledge-card-title>span{display:none}.article-header h1,.overview-header h1{font-size:25px}.markdown-content{font-size:14.5px}.video-frame{min-height:270px}.form-grid.two-column{grid-template-columns:1fr}.modal-backdrop{padding:10px}.modal-body{padding:16px}.sticky-actions{margin:0 -16px -16px;padding:12px 16px}.application-item{grid-template-columns:1fr}.application-actions{justify-content:flex-start}.discussion-card,.discussion-hero{grid-template-columns:1fr;flex-direction:column;align-items:flex-start}.discussion-card{display:grid}}@media (max-width:560px){.brand div,.global-search{display:none}.resource-item{grid-template-columns:34px minmax(0,1fr)}.resource-actions{grid-column:1/-1}.comment-form-footer{align-items:flex-start;flex-direction:column}.comment-replies{margin-left:10px}.comment-meta{align-items:flex-start}.login-intro{min-height:245px;padding:22px}.login-copy{margin:26px 0 18px}.login-copy h1{font-size:30px}.login-copy .brush-title{font-size:clamp(36px,12vw,52px)}.login-features{display:none}.login-tabs button{font-size:11px}.login-tabs{grid-template-columns:repeat(2,minmax(0,1fr))}.application-form,.application-status,.login-method{padding:21px 18px 23px}.home-hero-panel{grid-template-columns:1fr}.home-hero h1{font-size:32px}.home-hero-panel .section-kicker{grid-column:auto}.home-video-card{grid-template-columns:110px minmax(0,1fr)}.discussion-compose-footer{align-items:flex-start;flex-direction:column;gap:9px}}.sidebar-expand-tab,.tree-reopen{display:none}.sidebar-heading-actions{display:flex;align-items:center;gap:4px}.sidebar-collapse-button{width:34px;height:34px;border:1px solid #cbd8e8;border-radius:999px;color:#285d9b;background:#eef5ff}.sidebar-collapse-button:hover{border-color:#7da6d8;background:#dfeeff}.lesson-pager{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));grid-gap:12px;gap:12px;margin:22px 0 28px}.lesson-pager.top{width:min(100%,460px);gap:8px;margin:0 0 16px auto}.lesson-pager.top .lesson-pager-button{min-height:44px;gap:7px;padding:7px 10px}.lesson-pager.top .lesson-pager-button small{font-size:10px}.lesson-pager.top .lesson-pager-button strong{font-size:12px}.lesson-pager-button{min-width:0;min-height:68px;display:flex;align-items:center;gap:10px;border:1px solid var(--line-strong);border-radius:8px;padding:11px 14px;color:var(--text);background:var(--surface);font-family:inherit;text-align:left;cursor:pointer;transition:border-color .14s ease,background .14s ease}.lesson-pager-button.next{justify-content:flex-end;text-align:right}.lesson-pager-button:hover:not(:disabled){border-color:#8db8f1;background:var(--blue-soft)}.lesson-pager-button:disabled{color:var(--muted-light);cursor:default;opacity:.7}.lesson-pager-button span{min-width:0;display:grid;grid-gap:3px;gap:3px}.lesson-pager-button small{color:var(--blue);font-size:11px;font-weight:800}.lesson-pager-button strong{overflow:hidden;font-size:14px;font-weight:650;text-overflow:ellipsis;white-space:nowrap}@media (min-width:1101px){.workspace.sidebar-collapsed{grid-template-columns:54px minmax(0,1fr)}.workspace.sidebar-collapsed .directory-sidebar{width:54px;align-items:center}.directory-sidebar.collapsed .directory-tree,.directory-sidebar.collapsed .sidebar-heading,.directory-sidebar.collapsed .sidebar-summary{display:none}.directory-sidebar.collapsed .sidebar-expand-tab{position:fixed;left:0;top:50%;transform:translateY(-50%);z-index:30;width:38px;height:92px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:8px;margin:0;border:1px solid #a9c5e8;border-left:0;border-radius:0 9px 9px 0;color:var(--blue);background:#edf5ff;box-shadow:0 8px 20px rgba(37,99,168,.14);font-family:inherit;font-size:12px;font-weight:750;cursor:pointer}.directory-sidebar.collapsed .sidebar-expand-tab span{writing-mode:vertical-rl;letter-spacing:.08em;font-size:11px}}@media (max-width:720px){.lesson-pager{grid-template-columns:1fr}}.nav-count-badge{display:inline-flex;align-items:center;justify-content:center;min-width:20px;height:20px;margin-left:5px;padding:0 6px;border-radius:999px;background:#dc2626;color:#fff;font-size:12px;font-weight:700}.study-mode-switch{position:-webkit-sticky;position:sticky;top:76px;z-index:12;width:max-content;display:inline-flex;margin:14px 0 4px;padding:4px;border:1px solid #d7deea;border-radius:8px;background:rgba(255,255,255,.96);box-shadow:0 6px 18px rgba(31,45,68,.08)}.study-mode-switch button{min-width:88px;padding:7px 12px;border:0;border-radius:6px;background:transparent;color:#64748b;font-family:inherit;font-size:13px;font-weight:700;cursor:pointer}.study-mode-switch button.active{background:#2563a8;color:#fff}.reading-mode{width:min(1280px,100%);margin:12px 0 60px;padding:0 24px}.reading-mode-header{margin-bottom:26px;padding-bottom:20px;border-bottom:2px solid #d7e3f2}.reading-mode-header h1{margin:7px 0 8px;color:#172033;font-size:32px}.reading-mode-header p{margin:0;color:#64748b}.reading-chapter{margin-bottom:42px;padding-bottom:28px;border-bottom:1px solid #dfe6ef}.reading-chapter>header{margin-bottom:20px}.reading-chapter>header>span{color:#2563a8;font-size:13px;font-weight:750}.reading-chapter>header h2{margin:7px 0 8px;color:#172033;font-size:26px;line-height:1.35}.reading-chapter>header p{margin:0 0 12px;color:#64748b;line-height:1.7}.reading-directory{width:min(920px,100%)}.reading-toc{display:grid;grid-gap:22px;gap:22px}.reading-toc section{border-top:1px solid #dbe4ef;padding-top:16px}.reading-toc h2{margin:0 0 10px;color:#172033;font-size:19px}.reading-toc section>div{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));grid-gap:8px;gap:8px}.reading-toc button{display:grid;grid-template-columns:1fr auto 18px;align-items:center;grid-gap:8px;gap:8px;padding:11px 12px;border:1px solid #d7deea;border-radius:7px;background:#f8fafc;color:#25324a;font-family:inherit;text-align:left;cursor:pointer}.reading-toc button:hover{border-color:#8aa7d1;background:#eff6ff}.reading-toc button small{color:#64748b}.reading-error{margin:0 0 18px;padding:12px 14px;border:1px solid #efcaca;border-radius:7px;color:#8a3030;background:#fff4f4;line-height:1.65}.reading-empty-state{display:grid;justify-items:center;grid-gap:12px;gap:12px;padding:54px 20px;border:1px dashed #cbd8e7;border-radius:8px;color:#64748b;background:#fbfdff;text-align:center}.reading-pager{display:grid;grid-template-columns:minmax(0,1fr) auto minmax(0,1fr);align-items:stretch;grid-gap:10px;gap:10px;margin:16px 0 24px}.reading-pager>button{min-width:0;display:flex;align-items:center;gap:9px;padding:9px 11px;border:1px solid #d7deea;border-radius:7px;background:#f8fafc;color:#25324a;font-family:inherit;cursor:pointer}.reading-pager>button:nth-child(2){background:#eef5ff;color:#285d9b;font-weight:700}.reading-pager>button:last-child{justify-content:flex-end;text-align:right}.reading-pager>button:disabled{cursor:default;opacity:.55}.reading-pager>button span{min-width:0;display:grid;grid-gap:2px;gap:2px}.reading-pager small{color:#2563a8;font-size:11px;font-weight:750}.reading-pager strong{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.reading-page{min-width:0;padding:28px;border:1px solid #dce4ee;border-radius:8px;background:#fff;box-shadow:0 10px 26px rgba(31,45,68,.07)}.reading-page>header{margin-bottom:22px;padding-bottom:18px;border-bottom:2px solid #d7e3f2}.reading-page>header>span{color:#2563a8;font-size:13px;font-weight:750}.reading-page>header h1{margin:7px 0 8px;color:#172033;font-size:30px;line-height:1.35}.reading-page>header p{margin:0 0 12px;color:#64748b;line-height:1.7}.reading-page .markdown-content{max-width:none}@media (max-width:720px){.reading-mode{padding:0 12px}.reading-pager{grid-template-columns:repeat(2,minmax(0,1fr))}.reading-pager>button:first-child{grid-column:1;grid-row:1}.reading-pager>button:nth-child(2){grid-column:1/-1;grid-row:2;justify-content:center}.reading-pager>button:last-child{grid-column:2;grid-row:1;justify-content:flex-end;text-align:right}.reading-page{padding:16px 12px}}@media (max-width:560px){.study-mode-switch{top:66px;width:min(100%,340px)}.study-mode-switch button{flex:1 1;min-width:0}.reading-mode{width:100%;margin-top:8px;padding:0 2px}.reading-mode-header h1{font-size:26px}.reading-toc section>div{grid-template-columns:1fr}.reading-pager{gap:7px;margin:10px 0 16px}.reading-pager>button{padding:10px 11px}.reading-page{padding:18px 13px;border-radius:6px}.reading-page>header h1{font-size:24px}.markdown-content{font-size:15px;line-height:1.9}.markdown-content h1{font-size:23px}.markdown-content h2{font-size:19px}.markdown-content h3{font-size:17px}.markdown-content table{display:block;max-width:100%;overflow-x:auto}}.study-status-panel{position:-webkit-sticky;position:sticky;top:88px;z-index:5;float:right;width:218px;margin:0 0 22px 26px;padding:15px;border:1px solid #d7deea;border-radius:8px;background:rgba(255,255,255,.97);box-shadow:0 12px 28px rgba(31,45,68,.1)}.study-status-heading{display:flex;align-items:center;justify-content:space-between;margin-bottom:12px}.study-status-heading strong{color:#172033;font-size:15px}.study-status-heading span{padding:3px 7px;border-radius:999px;font-size:12px}.status-guest{background:#f1f5f9;color:#64748b}.status-online{background:#e8f7ef;color:#1f7a4d}.study-status-action{display:grid;grid-template-columns:22px 1fr auto;align-items:center;width:100%;margin-top:8px;padding:10px;border:1px solid #d7deea;border-radius:7px;background:#f8fafc;color:#25324a;cursor:pointer;text-align:left}.study-status-action:hover{border-color:#8aa7d1;background:#eff6ff}.study-status-action.active{border-color:#d6a21f;background:#fffaf0;color:#9a6700}.study-status-action:disabled{cursor:not-allowed;opacity:.55}.study-status-action em{color:#64748b;font-size:12px;font-style:normal}.study-status-note{display:grid;grid-gap:5px;gap:5px;margin-top:12px;padding-top:11px;border-top:1px solid #e2e8f0;color:#64748b;font-size:12px}.profile-favorites{margin-top:18px;padding-top:16px;border-top:1px solid #e2e8f0}.profile-favorites h3{margin:2px 0 0;font-size:18px}.profile-favorite-item{display:flex;align-items:center;gap:10px;width:100%;margin-top:8px;padding:10px;border:1px solid #d7deea;border-radius:7px;background:#f8fafc;color:#25324a}.profile-favorite-open{min-width:0;flex:1 1;display:flex;align-items:flex-start;gap:10px;padding:0;border:0;background:transparent;color:inherit;font-family:inherit;cursor:pointer;text-align:left}.profile-favorite-open>span{display:grid;grid-gap:3px;gap:3px}.profile-favorite-item small{color:#64748b}.access-settings-form{margin-bottom:22px;padding:18px;border:1px solid #d7deea;border-radius:8px;background:#f8fafc}.user-management-list{margin-bottom:24px}.managed-user-item{display:grid;grid-template-columns:42px minmax(150px,1fr) minmax(200px,1.4fr) auto;align-items:center;grid-gap:12px;gap:12px;padding:13px 0;border-bottom:1px solid #e2e8f0}.managed-user-main{display:grid;grid-gap:3px;gap:3px}.managed-user-main small,.managed-user-main span,.managed-user-stats{color:#64748b;font-size:12px}.managed-user-stats{display:flex;flex-wrap:wrap;gap:6px 12px}.managed-user-stats span{display:inline-flex;align-items:center;gap:4px}.managed-user-stats .online{color:#16834f;font-weight:700}.managed-users-table-wrap{width:100%;overflow-x:auto;border:1px solid #d7deea;border-radius:8px;background:#fff}.managed-user-add-actions{display:flex;gap:8px;flex-wrap:wrap}.managed-users-table{width:100%;min-width:1360px;border-collapse:collapse;font-size:13px}.managed-users-table td,.managed-users-table th{padding:11px 12px;border-bottom:1px solid #e2e8f0;color:#334155;text-align:left;white-space:nowrap}.managed-users-table th{position:-webkit-sticky;position:sticky;top:0;z-index:1;background:#eef4fb;color:#1f3f71;font-weight:750}.managed-users-table tbody tr:hover{background:#f8fafc}.managed-users-table td.allowed-chapters-cell{min-width:220px;max-width:320px;color:#475467;line-height:1.55;white-space:normal}.table-online{display:inline-flex;align-items:center;gap:4px;color:#16834f;font-weight:700}.managed-user-actions{display:flex;gap:6px}@media (max-width:1080px){.study-status-panel{position:static;float:none;width:100%;margin:0 0 18px}.managed-user-item{grid-template-columns:42px 1fr}.managed-user-item .application-actions,.managed-user-stats{grid-column:2}}.print-page{min-height:100vh;padding:0 18px 60px;background:#f3f6fa}.print-toolbar{position:-webkit-sticky;position:sticky;top:0;z-index:10;width:min(960px,100%);display:flex;align-items:center;justify-content:space-between;gap:16px;margin:0 auto;padding:14px 18px;border:1px solid #d7e0eb;border-top:0;border-radius:0 0 8px 8px;background:rgba(255,255,255,.97);box-shadow:0 8px 22px rgba(24,48,79,.08)}.print-toolbar>div:first-child{display:grid;grid-gap:3px;gap:3px}.print-toolbar strong{color:#172033;font-size:14px}.print-toolbar span{color:#64748b;font-size:12px}.print-toolbar-actions{display:flex;gap:8px;flex-wrap:wrap;justify-content:flex-end}.print-document{width:min(960px,100%);margin:24px auto 0;padding:48px 54px 42px;border:1px solid #dce4ee;border-radius:8px;background:#fff;box-shadow:0 12px 30px rgba(31,45,68,.08)}.print-document-header{margin-bottom:24px;padding-bottom:18px;border-bottom:2px solid #123f6d}.print-document-header>span{color:#1f5d99;font-size:12px;font-weight:750}.print-document-header h1{margin:9px 0 8px;color:#172033;font-size:32px;line-height:1.35}.print-document-header p{margin:0;color:#64748b;line-height:1.75}.print-document-footer{margin-top:34px;padding-top:14px;border-top:1px solid #dbe4ef;color:#64748b;font-size:12px;text-align:center}.print-error,.print-loading{width:min(760px,100%);margin:60px auto;padding:30px;border:1px solid #d7e0eb;border-radius:8px;color:#475467;background:#fff;text-align:center}.print-error{color:#8a3030;border-color:#efcaca;background:#fff4f4}.html-document-content{width:100%;margin:18px 0}.html-document-frame{width:100%;min-height:480px;display:block;border:1px solid #dce4ee;border-radius:8px;background:#fff}@media print{@page{margin:18mm 16mm}body,html{background:#fff!important}.print-page{min-height:0;padding:0;background:#fff}.print-toolbar{display:none!important}.print-document{width:100%;margin:0;padding:0;border:0;box-shadow:none}.print-document-header h1{font-size:25pt}.print-document .markdown-content{max-width:none;padding-top:12px;color:#111827;font-size:11.5pt;line-height:1.8}.print-document .embedded-svg,.print-document .markdown-content img,.print-document .math-diagram,.print-document table{page-break-inside:avoid;break-inside:avoid}.print-document a{color:inherit;text-decoration:none}.html-document-frame{min-height:0;border:0;border-radius:0}}@media (max-width:720px){.print-toolbar{align-items:flex-start;flex-direction:column}.print-toolbar-actions{width:100%;justify-content:flex-start}.print-document{padding:24px 16px}}