:root{--ink:#242735;--muted:#606473;--paper:#f4f5f8;--surface:#f4f5f8;--white:#fff;--line:#e6e9f0;--green:#235fe5;--lime:#eef3ff;--navy:#0b123e;--blue:#2868f5;--purple:#7955ed;--shadow:none}
*{box-sizing:border-box;min-width:0}body{margin:0;background:var(--paper);color:var(--ink);font:18px/1.65 Arial,Helvetica,sans-serif}a{color:inherit;text-underline-offset:4px}a:hover{text-decoration-thickness:2px}button,input,select,textarea{font:inherit}h1,h2,h3,p{margin:0 0 16px}h1,h2,h3{font-family:inherit;line-height:1.3;letter-spacing:-.4px}h1{font-size:38px;font-weight:750}h2{font-size:27px;font-weight:750}h3{font-size:21px;font-weight:650}p{max-width:72ch}button,.button{display:inline-flex;justify-content:center;align-items:center;gap:9px;min-height:48px;border:0;border-radius:14px;padding:12px 19px;background:var(--green);color:#fff;font-size:16px;font-weight:650;line-height:1.5;text-decoration:none;cursor:pointer;transition:background .16s,transform .16s}button:hover,.button:hover{background:#174bc2;color:#fff;text-decoration:none}button:active,.button:active{transform:translateY(1px)}button:disabled{opacity:.55;cursor:default}.button.secondary,button.secondary{background:#edf2ff;color:#1b50c4}.button.light{background:#fff;color:#151a2a;border-radius:30px}.small{padding:9px 15px;font-size:15px}.wide{width:100%}
.masthead{background:#fff;color:var(--navy);border-bottom:3px solid var(--blue)}.masthead-inner{max-width:1440px;min-height:78px;margin:auto;display:flex;align-items:center;justify-content:space-between;gap:24px;padding:12px 28px}.brand{display:flex;align-items:center;gap:12px;min-width:0;text-decoration:none}.brand:hover{text-decoration:none}.brand-logo{width:48px;height:48px;object-fit:contain;background:#fff;flex-shrink:0}.welcome-copy{display:block;min-width:0}.welcome-copy strong{display:block;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-size:20px;font-weight:750;line-height:1.25;letter-spacing:-.35px}.welcome-copy small{display:block;color:#606473;font-size:12px;line-height:1.4;margin-top:3px}.nav-actions{display:flex;align-items:center;gap:10px;flex-shrink:0}.language{min-width:44px;min-height:44px;display:inline-flex;align-items:center;justify-content:center;background:#f1f5fc;border:1px solid #e6eaf2;color:var(--navy);border-radius:12px;padding:9px 12px;font-size:13px;font-weight:650;text-decoration:none}.language:hover{background:#e6edfb;color:var(--navy);text-decoration:none}.header-account{min-height:44px;display:inline-flex;align-items:center;justify-content:center;gap:9px;background:var(--navy);color:#fff;border-radius:12px;padding:10px 16px;font-size:14px;font-weight:650;text-decoration:none}.header-account:hover{background:#1b2b70;color:#fff}.account-icon{position:relative;display:block;width:22px;height:24px;flex-shrink:0}.account-icon:before{content:"";position:absolute;width:8px;height:8px;left:7px;top:2px;border:1.7px solid currentColor;border-radius:50%}.account-icon:after{content:"";position:absolute;width:18px;height:9px;left:2px;bottom:1px;border:1.7px solid currentColor;border-radius:10px 10px 3px 3px}.sidebar-tools{margin:22px 0 0;padding:17px 10px 0;border-top:1px solid #ffffff26}.sound-toggle{display:inline-flex;align-items:center;justify-content:center;width:100%;min-height:44px;background:#ffffff12;border:1px solid #ffffff26;color:#e5ecff;border-radius:12px;padding:9px 10px;font-size:13px;font-weight:600}.sound-toggle:hover{background:#ffffff26;color:#fff}.sound-toggle[aria-pressed=true]{background:#2d65f0;color:#fff}
.academic-shell{max-width:1440px;margin:auto;display:grid;grid-template-columns:215px minmax(0,1fr);align-items:stretch}.academic-sidebar{display:flex;flex-direction:column;background:linear-gradient(180deg,#111b56,#090d29);padding:26px 16px;color:#fff}.academic-menu{margin:0}.academic-menu>summary{display:none}.sidebar-label{font-size:11px;letter-spacing:1px;color:#bdc8ef;margin:0 13px 17px}.main-navigation nav{display:flex;flex-direction:column;gap:9px}.main-navigation a{display:flex;align-items:center;min-height:48px;padding:12px 14px;border-radius:14px;color:#dae3ff;font-size:16px;line-height:1.5;text-decoration:none;transition:background .16s}.main-navigation a:hover{background:#ffffff12}.main-navigation a[aria-current=page]{background:#2b65ed;color:#fff;font-weight:650}.sidebar-signature{margin:auto 10px 0;padding-top:80px;color:#dce4ff;font-size:12px}.sidebar-signature span{font-size:11px;color:#9aaada}main{width:100%;padding:27px 26px 45px;background:var(--paper);min-width:0}.account-nav{margin:-4px 0 22px;display:flex;gap:8px 19px;flex-wrap:wrap;align-items:center;font-size:14px}.account-nav a{min-height:44px;display:inline-flex;align-items:center}.account-nav form{margin:0 0 0 auto}.link-button{background:none;color:var(--muted);padding:5px 0;min-height:44px;font:inherit}.link-button:hover{background:none;color:var(--ink);text-decoration:underline}
.reference-intro{background:linear-gradient(135deg,#172669 0%,#102bd3 52%,#0d123b 100%);margin:-27px -26px 0;padding:14px 26px 38px}.progress-panel{background:linear-gradient(118deg,#ffffff14,#ffffff0b);border:1px solid #ffffff16;border-radius:23px;padding:26px;color:#fff}.progress-heading{display:flex;align-items:center;gap:12px;color:#d4ddff;font-size:12px;font-weight:650;letter-spacing:.6px;margin-bottom:16px}.progress-emblem{display:grid;place-items:center;width:43px;height:43px;flex-shrink:0;border-radius:13px;background:#ffffff26;color:#fff;font-size:17px;font-weight:750;letter-spacing:-1px}.progress-panel h1{font-size:34px;margin-bottom:14px;max-width:650px}.progress-panel p{font-size:17px;line-height:1.65;color:#e3e9ff;max-width:610px;margin-bottom:20px}.progress-panel .button{font-size:15px;padding:10px 18px}.progress-values{display:flex;gap:35px;margin:12px 0 22px}.progress-values>div{display:flex;flex-direction:column}.progress-values strong{font-size:33px;font-weight:750}.progress-values span{font-size:13px;color:#dbe4ff}
.service-section{position:relative;margin:-16px -26px 0;padding:23px 26px 0;background:var(--paper);border-radius:26px 26px 0 0}.section-head{display:flex;align-items:center;justify-content:space-between;gap:15px;flex-wrap:wrap;margin:29px 0 18px}.section-head h1,.section-head h2{margin-bottom:0}.service-section>.section-head{margin-top:0}.section-head p{margin:15px 0 0}.text-link{display:inline-flex;align-items:center;min-height:44px;font-size:15px;color:#245acb;text-decoration:none;font-weight:600}.text-link:hover{text-decoration:underline}.service-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:17px}.service-tile{position:relative;overflow:hidden;border-radius:21px;min-height:142px;padding:21px 18px;display:flex;flex-direction:column;justify-content:center;color:#fff;text-decoration:none;transition:transform .18s,box-shadow .18s}.service-tile:hover{transform:translateY(-3px);text-decoration:none;box-shadow:0 7px 17px #14285215}.service-tile strong{position:relative;z-index:1;font-size:23px;line-height:1.25;max-width:100%;letter-spacing:-.4px}.service-tile>span:not(.tile-art){position:relative;z-index:1;font-size:12px;margin-top:10px;line-height:1.5;max-width:145px}.tile-green{background:linear-gradient(135deg,#087f53,#087950)}.tile-purple{background:linear-gradient(135deg,#7957ed,#6540d9)}.tile-blue{background:linear-gradient(135deg,#2d6cf3,#1d56d2)}.tile-magenta{background:linear-gradient(135deg,#bb35d5,#9d2cc5)}.tile-art{position:absolute;right:-9px;bottom:-21px;font-size:104px;line-height:1;color:#fff;opacity:.16;font-weight:800;transform:rotate(-9deg);pointer-events:none}.tile-art.tile-letters{font-size:76px;right:-7px;bottom:-5px;letter-spacing:-6px;transform:rotate(-11deg)}
.challenge-banner{position:relative;display:flex;align-items:center;justify-content:space-between;gap:20px;overflow:hidden;background:linear-gradient(105deg,#236cea,#1726ef);color:#fff;border-radius:23px;padding:27px 29px;margin-top:23px}.challenge-copy{position:relative;z-index:1;max-width:650px}.banner-label{display:block;color:#e7efff;font-size:11px;font-weight:650;letter-spacing:1px;margin-bottom:11px}.challenge-banner h2{font-size:30px;margin-bottom:12px;max-width:570px}.challenge-banner p{font-size:17px;color:#ffffff;max-width:530px;margin-bottom:21px}.challenge-banner .button{font-size:15px;padding:11px 20px}.challenge-trophy{font-size:125px;line-height:1;flex-shrink:0;transform:rotate(-8deg);filter:hue-rotate(155deg) saturate(1.15) drop-shadow(0 10px 9px #071d6628)}
.home-columns{display:grid;grid-template-columns:minmax(0,1.55fr) minmax(0,1fr);gap:24px}.content-panel{background:#fff;border-radius:22px;padding:23px;border:1px solid #eef0f5}.test-row{display:flex;gap:13px;align-items:center;padding:19px 0;border-bottom:1px solid var(--line)}.test-row:first-child{padding-top:0}.test-row:last-child{padding-bottom:0;border-bottom:0}.test-level{display:grid;place-items:center;width:45px;height:48px;flex-shrink:0;border-radius:13px;background:#edf2ff;color:#2b60d0;font-size:16px;font-weight:750}.test-copy{flex:1}.test-copy h3{font-size:18px;line-height:1.4;margin-bottom:5px;overflow-wrap:anywhere}.test-copy h3 a{text-decoration:none}.test-copy h3 a:hover{text-decoration:underline}.test-copy p{font-size:13px;color:var(--muted);margin:0}.test-open{display:grid;place-items:center;width:40px;height:46px;flex-shrink:0;font-size:24px;text-decoration:none;color:#2e64d8}.support-panel h3{font-size:21px}.support-panel p{font-size:16px;color:var(--muted)}.support-panel .access-note{margin:17px 0 0;font-size:14px;line-height:1.6}.reading-columns{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:24px}.reading-list article+article{border-top:1px solid var(--line);margin-top:20px;padding-top:20px}.reading-list h3{font-size:21px;line-height:1.45;margin:9px 0}.reading-list h3 a{text-decoration:none}.reading-list p{font-size:16px;color:var(--muted);margin-bottom:0}.material-meta{font-size:12px;color:var(--muted)}.eyebrow{display:block;font-size:12px;letter-spacing:1px;font-weight:650;text-transform:uppercase;color:var(--muted);margin-bottom:14px}
.grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:22px}.card{border:1px solid var(--line);border-radius:3px;padding:28px;background:var(--white);overflow-wrap:anywhere}.material{display:flex;flex-direction:column;min-height:250px;border-top:2px solid #8c8c8c}.material h3{font:400 25px/1.4 Georgia,'Times New Roman',serif;margin-bottom:13px}.material h3 a{text-decoration:none}.material h3 a:hover{text-decoration:underline}.material p{font-size:16px;color:var(--muted);flex:1}.tag{display:inline-block;width:fit-content;font-size:12px;color:#555;border-bottom:1px solid #bcbcbc;margin-bottom:17px;padding-bottom:5px}.card-end{border-top:1px solid var(--line);margin-top:10px;padding-top:16px;display:flex;justify-content:space-between;align-items:center;gap:14px;font-size:15px}.arrow{display:inline-flex;align-items:center;justify-content:center;min-width:44px;min-height:44px;font-size:22px}.muted{color:var(--muted);font-size:15px}.empty{padding:25px 0;font-size:16px;color:var(--muted)}
.account-nav{display:flex;align-items:center;gap:8px 24px;flex-wrap:wrap;padding:15px 0;border-bottom:1px solid var(--line);font-size:15px}.account-nav a{display:inline-flex;align-items:center;min-height:44px}.account-nav form{margin:0 0 0 auto}.link-button{padding:6px 0;min-height:44px;border:0;background:none;color:var(--muted);font:inherit;text-decoration:underline}.link-button:hover{background:none;color:var(--ink)}.narrow{max-width:650px;margin:45px auto}.form{display:flex;flex-direction:column;gap:20px}.form h1{font-size:36px}.form h2{font-size:28px}.form p{margin-bottom:0}label{display:block;font-size:16px;font-weight:600}input:not([type=checkbox]):not([type=radio]),select,textarea{display:block;width:100%;border:1px solid #a9a9a9;border-radius:3px;padding:12px;margin-top:8px;background:#fff;color:var(--ink);font-size:17px;line-height:1.5;min-width:0}textarea{resize:vertical}.form-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:22px}.check{display:flex;gap:12px;align-items:flex-start;font-weight:400}.check input{margin-top:8px;accent-color:var(--green);flex-shrink:0;width:18px;height:18px}.auth-shell{display:grid;grid-template-columns:1fr 1fr;gap:65px;padding:55px 0;align-items:start}.auth-intro{padding-top:20px}.auth-intro h1{font-size:43px}.split{display:flex;flex-wrap:wrap;justify-content:space-between;gap:12px;font-size:15px}.secret{display:block;padding:20px;background:var(--surface);font-size:19px;overflow-wrap:anywhere;margin:20px 0}.flash{padding:18px 22px;margin:24px 0;background:var(--surface);border-left:3px solid #555;font-size:16px}.notice{padding:18px;border-left:3px solid #777;background:var(--surface);font-size:16px}
.filters{display:flex;align-items:end;gap:14px;margin-bottom:30px}.filters input{flex:2;margin:0!important}.filters select{flex:1;margin:0}.two-col{display:grid;grid-template-columns:minmax(0,1.7fr) minmax(280px,1fr);gap:32px;align-items:start}.stack{display:flex;flex-direction:column;gap:18px}.reading{font-size:18px;line-height:1.85}.reading>div{margin-bottom:28px}.reading .button{margin-block:18px}.purchase h2,.price{font-size:30px}.stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(170px,1fr));gap:20px;margin:30px 0}.stats .card{display:flex;flex-direction:column}.stats strong{display:block;font:42px/1.3 Georgia,serif;margin-bottom:12px}.stats span{font-size:15px;color:var(--muted)}.order-row{display:flex;justify-content:space-between;align-items:center;gap:20px;font-size:16px}.order-row h3{font-size:21px;margin-bottom:0}.order-row p{margin-top:9px;margin-bottom:0}.order-row .tag{margin-bottom:9px}.tabs{display:flex;gap:8px;flex-wrap:wrap;margin:25px 0}.tabs a{display:inline-flex;align-items:center;justify-content:center;min-width:48px;min-height:46px;padding:8px 14px;border:1px solid var(--line);font-size:16px;text-decoration:none}.tabs .active{background:var(--green);color:#fff;border-color:var(--green)}table{width:100%;border-collapse:collapse;text-align:left;font-size:16px}th,td{padding:17px 12px;border-bottom:1px solid var(--line);vertical-align:top}th{font-size:14px;color:var(--muted);font-weight:600}table tr:last-child td{border-bottom:0}.table-scroll{overflow-x:auto}.rank-number{display:inline-flex;align-items:center;justify-content:center;min-width:30px;font-weight:600}
.timer-bar{position:sticky;top:0;z-index:5;display:flex;align-items:center;justify-content:space-between;gap:18px;background:#414141;color:white;padding:17px 23px;font-size:16px;margin-bottom:28px}.timer-bar strong{font-size:24px;font-variant-numeric:tabular-nums}.assessment{max-width:850px;margin:40px auto}.question{min-width:0;margin:0 0 28px}.question legend{padding:6px 14px;border:1px solid var(--line);background:var(--surface);font-size:15px}.question h2{font:400 24px/1.6 Arial,Helvetica,sans-serif;white-space:pre-line;letter-spacing:0}.option{display:flex;align-items:center;gap:12px;padding:15px;margin:12px 0;border:1px solid var(--line);border-radius:3px;font-size:18px;font-weight:400;cursor:pointer}.option:has(input:checked){border-color:#555;background:var(--surface)}.option input{accent-color:#444;width:18px;height:18px;flex-shrink:0}.result{text-align:center;max-width:700px;margin:40px auto}.result>strong{display:block;font:78px/1.3 Georgia,serif}.result>strong small{font-size:32px;color:var(--muted)}.review{margin:25px auto;max-width:850px}.review h3{white-space:pre-line}.word-list{margin-top:22px}.word-list>div{display:flex;justify-content:space-between;gap:20px;padding:13px 0;border-bottom:1px solid var(--line);font-size:18px}details{margin-top:25px}summary{cursor:pointer;font-size:18px;font-weight:600;padding-block:9px}.certificate{border:7px double #777;padding:58px;text-align:center;margin:40px auto;max-width:950px;background:#fff}.certificate-seal{display:block;font-size:60px;color:#666}.certificate h1{font:40px/1.3 Georgia,serif;letter-spacing:5px}.certificate h2{font-size:43px;margin:25px 0}.certificate-meta{display:flex;justify-content:space-between;gap:20px;border-top:1px solid var(--line);padding:25px 0;margin-top:30px;font-size:15px}.certificate small{font-size:12px;overflow-wrap:anywhere;color:var(--muted)}.print-button{display:block;margin:22px auto}.post-preview{white-space:pre-wrap;font:16px/1.8 Arial,sans-serif;overflow-wrap:anywhere;margin:0}
footer{max-width:1136px;margin:auto;border-top:1px solid var(--line);padding:30px 0;display:flex;align-items:center;justify-content:space-between;gap:20px;flex-wrap:wrap}footer p,footer small,footer div{font-size:14px;color:var(--muted);margin:0}footer div{display:flex;gap:20px;flex-wrap:wrap}.footer-brand{font:22px/1.4 Georgia,serif}:focus-visible{outline:3px solid #707070;outline-offset:4px}

.card{border:1px solid #edf0f5;border-radius:22px;padding:26px;background:#fff;box-shadow:none}.material{border-top:0;min-height:245px}.material h3{font:650 23px/1.4 Arial,Helvetica,sans-serif}.material p{font-size:16px}.tag{font-size:12px;color:#2b5cc5;border:0;padding:5px 9px;border-radius:8px;background:#eef3ff}.card-end{border-color:var(--line)}.arrow{border-radius:50%;color:#275ed1;background:#edf2ff}.filters{background:#fff;padding:18px;border-radius:18px}.filters input,.filters select{border-radius:12px;border-color:#d9dfeb;background:#f8f9fc}.form label,label{font-size:16px}input:not([type=checkbox]):not([type=radio]),select,textarea{border-radius:12px;border-color:#cfd6e4;font-size:17px;padding:13px;min-height:48px}.form h1{font-size:31px}.narrow{margin:30px auto}.stats .card{border-radius:20px}.stats strong{font:750 37px/1.3 Arial,sans-serif;color:#265de0}.stats span{font-size:15px}.notice,.flash{border-radius:13px;background:#edf3ff;border-left-color:#3166df;font-size:16px}.question{border:1px solid #e1e6f0}.question legend{border-radius:10px;background:#edf3ff;border-color:#dbe4f8}.question h2{font-size:23px}.option{border-radius:13px;background:#fafbfe;font-size:18px;min-height:54px}.option:has(input:checked){border-color:#2964e7;background:#edf3ff}.option input,.check input{accent-color:#2868f5}.tabs a{border-radius:11px;background:#fff}.tabs .active{background:#2868f5;border-color:#2868f5}.timer-bar{background:#153cba;border-radius:15px}.result>strong{font-family:Arial,sans-serif;font-weight:750;color:#2868f5}.result>strong small{color:#64738b}.rank-number{background:#edf3ff;color:#2861da;border-radius:10px}.reading{font-size:18px;line-height:1.85}.post-preview{font-size:16px;line-height:1.8}.muted{font-size:15px}.empty{font-size:16px;color:var(--muted);padding:15px 0;margin:0}.auth-intro h1{font-size:36px}.word-list>div{font-size:18px}.certificate{border-color:#315fd3;border-radius:5px}.certificate h1,.certificate h2{font-family:Georgia,serif}.certificate-seal{color:#2b61d8}footer{max-width:1388px;margin:0 auto;padding:25px 26px 32px;border-top:1px solid #e0e4ee;display:flex;justify-content:space-between;align-items:center;gap:17px;flex-wrap:wrap}footer p,footer div,footer small{margin:0;font-size:13px;color:var(--muted)}footer div{display:flex;gap:15px;flex-wrap:wrap}.footer-brand{font-size:17px;font-weight:700;color:#1d3f8f}.mobile-bottom-nav{display:none}:focus-visible{outline:3px solid #7fa5ff;outline-offset:4px}
@media(max-width:1200px){.service-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.service-tile{min-height:125px}.service-tile strong{font-size:23px}.home-columns{grid-template-columns:1fr}.challenge-banner h2{font-size:27px}.challenge-trophy{font-size:105px}.grid{grid-template-columns:repeat(2,minmax(0,1fr))}.two-col{grid-template-columns:minmax(0,1fr)}}
@media(max-width:900px){body{padding-bottom:calc(105px + env(safe-area-inset-bottom,0px))}.academic-shell{display:block}.academic-sidebar{display:block;padding:0 20px 11px;background:linear-gradient(110deg,#102d9c,#0a1036)}.academic-menu>summary{display:flex;align-items:center;justify-content:space-between;gap:12px;min-height:44px;padding:4px 0;color:#e5ecff;font-size:14px;font-weight:600;list-style:none}.academic-menu>summary::-webkit-details-marker{display:none}.academic-menu>summary span{display:grid;place-items:center;width:27px;height:27px;border-radius:9px;background:#ffffff19}.academic-menu[open]>summary span{transform:rotate(180deg)}.sidebar-label,.sidebar-signature{display:none}.main-navigation nav{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:7px;padding-top:9px}.main-navigation a{background:#ffffff0b;font-size:15px;padding:11px 12px;border-radius:11px}.main-navigation a[aria-current=page]{background:#3168eb}main{padding:23px 20px 34px}.reference-intro{margin:-23px -20px 0;padding:10px 20px 36px}.service-section{margin:-16px -20px 0;padding:23px 20px 0}.progress-panel{padding:23px}.progress-panel h1{font-size:30px}.progress-panel p{font-size:17px}.service-grid{gap:16px}.service-tile{border-radius:21px;min-height:133px;padding:20px}.challenge-banner{padding:25px;border-radius:23px;gap:10px}.challenge-banner h2{font-size:27px}.challenge-banner p{font-size:16px}.challenge-trophy{font-size:105px}.reading-columns{grid-template-columns:1fr;gap:0}.home-columns{gap:0}.section-head{margin-top:27px}.section-head h1{font-size:31px}.section-head h2{font-size:27px}.grid{grid-template-columns:repeat(2,minmax(0,1fr))}.auth-shell{grid-template-columns:1fr;gap:18px;padding-top:8px}.auth-intro{padding-top:0}.form-grid{grid-template-columns:1fr}.filters{flex-wrap:wrap;gap:10px}.filters input{flex-basis:100%}.filters select{flex-basis:40%;width:auto}.filters button{flex:1}.account-nav{gap:7px 16px;margin-bottom:20px;font-size:14px}.account-nav form{margin:0}.stats{grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}.stats .card{padding:20px 14px}.stats strong{font-size:30px}.stats span{font-size:13px}.order-row{flex-wrap:wrap}.order-row h3{font-size:20px}.mobile-bottom-nav{position:fixed;z-index:30;left:14px;right:14px;bottom:calc(12px + env(safe-area-inset-bottom,0px));display:flex;align-items:center;justify-content:space-between;gap:3px;max-width:520px;margin:0 auto;background:#fff;border:5px solid #fff;border-radius:42px;padding:4px;box-shadow:0 -2px 25px #10214a12}.mobile-bottom-nav a{display:flex;flex:1;min-width:0;min-height:62px;flex-direction:column;align-items:center;justify-content:center;gap:4px;padding:5px 2px;border-radius:31px;color:#606776;text-decoration:none;font-size:11px;font-weight:600;line-height:1.3}.mobile-bottom-nav a[aria-current=page]{color:#2464e8;background:#f0f4fc}.bottom-symbol{display:flex;align-items:center;justify-content:center;height:27px;font-size:25px;line-height:1;font-weight:750;filter:grayscale(1)}.mobile-bottom-nav a[aria-current=page] .bottom-symbol{filter:none}footer{padding:24px 20px;flex-direction:column;align-items:flex-start}.footer-brand{font-size:17px}footer p,footer div,footer small{font-size:12px}}
@media(max-width:600px){.academic-sidebar{padding-inline:17px}.academic-menu>summary{font-size:13px}main{padding:21px 17px 29px}.reference-intro{margin:-21px -17px 0;padding:9px 17px 33px}.progress-panel{padding:21px 20px;border-radius:22px}.progress-heading{font-size:11px;letter-spacing:.3px;gap:10px;margin-bottom:16px}.progress-emblem{width:39px;height:39px;border-radius:12px;font-size:16px}.progress-panel h1{font-size:29px;line-height:1.25;letter-spacing:-.6px}.progress-panel p{font-size:16px;line-height:1.65;margin-bottom:19px}.progress-panel .button{font-size:15px;min-height:46px}.progress-values{gap:28px}.progress-values strong{font-size:31px}.progress-values span{font-size:12px}.service-section{margin:-14px -17px 0;padding:22px 17px 0;border-radius:25px 25px 0 0}.service-section>.section-head{margin-bottom:18px}.service-grid{gap:14px}.service-tile{padding:20px 17px;min-height:125px;border-radius:20px}.service-tile strong{font-size:22px}.service-tile>span:not(.tile-art){font-size:12px;line-height:1.45;margin-top:9px;max-width:136px}.tile-art{font-size:100px;bottom:-20px;right:-11px}.tile-art.tile-letters{font-size:72px;bottom:-3px;right:-11px}.challenge-banner{margin-top:20px;padding:23px 21px;gap:0;border-radius:22px;min-height:245px;align-items:center}.challenge-copy{max-width:72%}.banner-label{font-size:11px;letter-spacing:.65px;margin-bottom:10px}.challenge-banner h2{font-size:25px;line-height:1.23;letter-spacing:-.4px}.challenge-banner p{font-size:15px;line-height:1.5;max-width:210px;margin-bottom:20px}.challenge-banner .button{font-size:14px;padding:10px 16px;min-height:46px;white-space:normal}.challenge-trophy{position:absolute;right:3px;top:55px;font-size:98px;opacity:.95}.section-head{margin-top:26px;margin-bottom:17px;gap:10px}.section-head h2{font-size:26px}.section-head .text-link{font-size:13px}.content-panel{padding:20px;border-radius:21px}.test-row{gap:11px;padding:18px 0}.test-level{width:40px;height:44px;font-size:14px;border-radius:12px}.test-copy h3{font-size:17px;line-height:1.4}.test-copy p{font-size:12px}.test-open{width:44px;min-height:44px;font-size:24px}.support-panel h3{font-size:22px}.support-panel p{font-size:17px}.support-panel .access-note{font-size:14px}.reading-list h3{font-size:21px}.reading-list p{font-size:17px}.grid{grid-template-columns:1fr;gap:16px}.card{padding:23px 20px;border-radius:20px}.material{min-height:0}.material h3{font-size:24px}.material p{font-size:17px}.narrow{margin:8px auto 22px}.form h1{font-size:29px}.stats{grid-template-columns:1fr}.stats .card{display:flex;align-items:center;flex-direction:row;gap:18px;padding:19px 21px}.stats strong{min-width:45px;font-size:33px;margin-bottom:0}.stats span{font-size:15px}.question{padding:20px 15px}.question h2{font-size:22px}.timer-bar{flex-wrap:wrap;gap:9px;padding:15px;font-size:15px}.option{font-size:18px;padding:14px}.certificate{padding:27px 17px}.certificate h1{font-size:25px;letter-spacing:1px}.certificate h2{font-size:32px}.certificate-meta{flex-direction:column;font-size:13px}.certificate small{font-size:11px}table{font-size:15px}th,td{padding:14px 6px;overflow-wrap:anywhere}th{font-size:12px}.mobile-bottom-nav{left:10px;right:10px;bottom:calc(10px + env(safe-area-inset-bottom,0px));border-width:4px;padding:4px;gap:1px}.mobile-bottom-nav a{min-height:59px;font-size:11px;gap:4px}.bottom-symbol{font-size:24px;height:25px}}
@media(max-width:360px){.academic-sidebar{padding-inline:14px}main{padding-inline:14px}.reference-intro{margin-inline:-14px;padding-inline:14px}.service-section{margin-inline:-14px;padding-inline:14px}.service-grid{gap:12px}.service-tile{padding:19px 14px;min-height:120px}.service-tile strong{font-size:21px}.service-tile>span:not(.tile-art){font-size:11px}.challenge-banner{padding:22px 18px}.challenge-copy{max-width:76%}.challenge-banner h2{font-size:24px}.challenge-trophy{font-size:82px;right:-5px;top:68px}.content-panel{padding:18px}.section-head h2{font-size:25px}}
@media(max-width:900px){.masthead-inner{min-height:72px;padding:12px 20px;gap:16px}.welcome-copy strong{font-size:19px}.brand-logo{width:44px;height:44px}.sidebar-tools{margin:12px 0 0;padding:12px 0 0;max-width:230px}}
@media(max-width:600px){.masthead-inner{min-height:68px;padding:12px 17px;gap:12px}.masthead .brand{flex:1;gap:9px}.brand-logo{width:42px;height:42px}.welcome-copy strong{font-size:17px}.welcome-copy small{font-size:11px;white-space:nowrap}.nav-actions{gap:7px}.language{width:44px;padding:8px}.header-account{width:44px;padding:8px}.account-label{display:none}.sidebar-tools .sound-toggle{font-size:13px}}
@media(max-width:360px){.masthead-inner{padding-inline:14px;gap:8px}.masthead .brand{gap:8px}.brand-logo{width:40px;height:40px}.welcome-copy strong{font-size:16px;letter-spacing:-.4px}.nav-actions{gap:6px}}
@media(prefers-reduced-motion:no-preference){main{animation:uj-mobile-enter .2s ease-out both}@keyframes uj-mobile-enter{from{opacity:.85;transform:translateY(4px)}to{opacity:1;transform:translateY(0)}}}
@media(prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important;scroll-behavior:auto!important}.service-tile:hover,.button:active,button:active{transform:none}}
@media print{body{padding:0;background:#fff;color:#222;font-size:12pt}.masthead,.academic-sidebar,.mobile-bottom-nav,.account-nav,footer,.print-button,.flash,button{display:none!important}.academic-shell{display:block}main{padding:0;background:#fff;animation:none}.certificate{margin:10mm auto;padding:18mm;max-width:none;break-inside:avoid;border:6px double #315fd3}.certificate h1{font-size:28pt}.certificate h2{font-size:32pt}}

input,select,textarea{scroll-margin-block:90px}.mobile-bottom-nav a:last-child .bottom-symbol{font-size:0;position:relative;width:27px;height:27px}.mobile-bottom-nav a:last-child .bottom-symbol:before{content:"";position:absolute;width:11px;height:11px;top:1px;left:8px;border-radius:50%;background:currentColor}.mobile-bottom-nav a:last-child .bottom-symbol:after{content:"";position:absolute;width:23px;height:11px;bottom:1px;left:2px;border-radius:12px 12px 3px 3px;background:currentColor}

/* Material management and grouped navigation */
[hidden]{display:none!important}.main-navigation nav{gap:18px}.navigation-group{display:grid;gap:5px}.navigation-heading{margin:0 12px 4px;font-size:11px;line-height:1.5;letter-spacing:.7px;color:#bdc8ef}.material-cover{display:block;width:100%;max-height:250px;aspect-ratio:16/10;object-fit:contain;background:#f1f3f8;border-radius:13px;margin:0 0 18px}.material-cover-detail{max-height:480px;aspect-ratio:auto}.test-thumbnail{width:58px;height:62px;object-fit:cover;border-radius:12px;flex-shrink:0}.material-editor{max-width:1100px;margin-inline:auto}.material-editor .form-grid>div{display:flex;flex-direction:column;gap:18px}.editor-toolbar{display:flex;align-items:center;gap:10px 20px;flex-wrap:wrap}.editor-toolbar p{margin:0;flex-basis:100%;color:var(--muted);font-size:16px}.editor-section{margin:0;padding:22px;border:1px solid var(--line);border-radius:16px;min-width:0}.editor-section legend{font-size:21px;font-weight:650;padding:0 8px;color:var(--navy)}.editor-section>p{font-size:16px}.editor-section>label{margin-top:16px}.cover-preview{display:flex;gap:12px}.editor-cover{display:block;width:100%;max-width:320px;height:190px;object-fit:contain;border-radius:14px;background:#f1f3f8;margin:0 0 16px}.attachment-current{display:flex;flex-wrap:wrap;align-items:center;gap:15px;overflow-wrap:anywhere;margin-bottom:18px}.attachment-current strong{font-size:16px}.text-file-editor{margin-top:20px}.text-file-editor summary{min-height:44px;display:list-item;font-size:16px;padding:8px 0}.text-file-editor .check{margin:16px 0}.upload-selection{font-size:13px;color:var(--muted);margin:9px 0 0;overflow-wrap:anywhere}.upload-status{padding:18px;border:1px solid #c9d9fc;border-radius:14px;background:#eef4ff;color:#183f8b}.upload-status p{margin:0;font-size:16px;line-height:1.6;max-width:none}.upload-status progress{display:block;width:100%;height:14px;margin-top:14px;accent-color:var(--blue)}.upload-status.upload-error{color:#8f2727;background:#fff1f1;border-color:#f0cccc}.material-editor input[type=file]{white-space:normal;font-size:16px;max-width:100%}.material-editor textarea[name=file_text]{font-family:monospace;font-size:16px;line-height:1.6}.material-editor[aria-busy=true]{opacity:.9}
@media(max-width:900px){.main-navigation nav{grid-template-columns:1fr;gap:20px}.navigation-group{grid-template-columns:repeat(2,minmax(0,1fr));gap:7px}.navigation-heading{grid-column:1/-1;margin:0 0 2px}.main-navigation .navigation-group a{margin:0}.sidebar-tools{margin-top:20px}}
@media(max-width:600px){.editor-section{padding:17px 14px}.editor-section legend{font-size:19px}.editor-toolbar p{font-size:16px}.attachment-current{align-items:flex-start;flex-direction:column}.attachment-current .button{font-size:14px;width:100%}.test-thumbnail{width:44px;height:49px}.editor-cover{height:165px}.upload-status{padding:15px}}
@media print{.upload-status{display:none}}

.import-list{display:grid;gap:16px;margin-top:24px}.import-item{display:grid;grid-template-columns:112px minmax(0,1fr);gap:22px;align-items:start;border-radius:18px}.import-item img{display:block;width:112px;height:116px;object-fit:contain;background:#f0f3f9;border-radius:12px}.import-item h3{margin:7px 0;font-size:21px}.import-item p{margin-bottom:8px;font-size:16px}.import-item .muted{font-size:12px}@media(max-width:600px){.import-item{grid-template-columns:68px minmax(0,1fr);gap:13px;padding:18px 14px}.import-item img{width:68px;height:78px}.import-item h3{font-size:18px}.import-item p{font-size:15px}.tabs a{max-width:100%;overflow-wrap:anywhere}}