:root{--bg:#f6f8fc;--ink:#15243c;--sub:#66758f;--line:#e5eaf2;--surface:#ffffff;--nav:#111d32;--brand:#356df4;--brand-soft:#eff4ff;--good:#13a77d;--good-bg:#e9f9f2;--hard:#e3992d;--hard-bg:#fff4e6;--new:#8795aa;--new-bg:#f0f3f7;--shadow:0 6px 25px rgba(30,49,89,.045);font-family:Inter,-apple-system,BlinkMacSystemFont,"Segoe UI",Arial,sans-serif;font-synthesis:none;color:var(--ink)}
*{box-sizing:border-box}html{scroll-behavior:auto}body{margin:0;min-width:320px;background:var(--bg);font-size:14px;line-height:1.5}button,input,textarea,select{font:inherit}button{cursor:pointer}button:disabled{opacity:.45;cursor:not-allowed}a{color:inherit;text-decoration:none}img,svg{display:block}*:focus-visible{outline:3px solid rgba(53,109,244,.4);outline-offset:3px}
#app{min-height:100vh}.shell{display:grid;grid-template-columns:264px minmax(0,1fr);min-height:100vh}.side{background:var(--nav);color:#edf4ff;position:sticky;top:0;height:100vh;display:flex;flex-direction:column;padding:26px 17px 20px;z-index:25}.side-brand{display:flex;align-items:center;gap:12px;padding:4px 12px 30px}.brand-mark{width:42px;height:42px;border-radius:13px;background:linear-gradient(135deg,#4e82ff,#36c0d7);display:grid;place-items:center;box-shadow:0 6px 22px rgba(62,115,244,.25)}.brand-title{font-size:17px;font-weight:800;letter-spacing:-.6px;line-height:1.15}.brand-sub{font-size:11px;color:#9baecd;display:block;margin-top:4px}.nav-label{padding:8px 14px;margin-top:2px;font-size:10px;font-weight:800;color:#7386a5;letter-spacing:1.6px}.nav-button{width:100%;border:0;background:transparent;color:#aab8d1;display:flex;align-items:center;gap:12px;padding:12px 14px;border-radius:11px;text-align:left;font-weight:570;margin:2px 0;transition:background .15s,color .15s}.nav-button .ic{opacity:.85}.nav-button:hover{background:#202f4b;color:#fff}.nav-button.is-active{background:#2a3c60;color:#fff;font-weight:690;box-shadow:inset 3px 0 0 #5f90ff}.nav-button .tiny-count{margin-left:auto;border-radius:7px;background:#394b67;padding:1px 7px;color:#eff3ff;font-size:11px}.side-bottom{margin-top:auto;border-top:1px solid #2a3a57;padding-top:18px}.school-card{padding:14px;border:1px solid #344761;border-radius:13px;background:#1c2b45}.school-card .over{font-size:10px;color:#9aaed0;text-transform:uppercase;letter-spacing:1.2px;font-weight:720}.school-card strong{display:block;font-size:13px;margin-top:4px}.school-card p{color:#9eb0c9;font-size:11px;margin:4px 0 0;line-height:1.45}.school-card .status-dot{display:inline-block;width:7px;height:7px;background:#38cb9b;border-radius:50%;margin-right:6px}.main{min-width:0;display:flex;flex-direction:column}.topbar{height:88px;padding:0 42px;display:flex;align-items:center;justify-content:space-between;gap:18px;background:#fff;border-bottom:1px solid var(--line)}.breadcrumb{display:flex;align-items:center;gap:9px;color:#74829a;font-size:12px;font-weight:650}.breadcrumb .current{color:var(--ink)}.top-actions{display:flex;align-items:center;gap:11px}.top-mini{border:1px solid var(--line);background:#fff;color:var(--sub);border-radius:11px;padding:8px 11px;display:flex;align-items:center;gap:8px;font-weight:650;font-size:12px}.top-mini:hover{background:var(--bg)}.avatar{height:38px;width:38px;border-radius:12px;display:grid;place-items:center;font-weight:800;background:#e9effe;color:var(--brand);font-size:13px}.mobile-menu{display:none;border:0;background:transparent;color:var(--ink);padding:7px}.body-content{padding:35px 42px 76px;width:100%;max-width:1360px;margin:0 auto}.eyebrow{font-size:11px;font-weight:800;letter-spacing:1.6px;color:#5479bf;text-transform:uppercase}.page-title{font-size:30px;letter-spacing:-1.2px;line-height:1.18;font-weight:790;margin:7px 0 7px}.page-description{color:var(--sub);margin:0 0 24px;font-size:14px}.section-heading{display:flex;align-items:center;justify-content:space-between;gap:12px;margin:28px 0 14px}.section-heading h2{font-size:17px;letter-spacing:-.4px;margin:0;font-weight:770}.section-note{font-size:12px;color:var(--sub)}.surface{background:var(--surface);border:1px solid var(--line);border-radius:17px;box-shadow:var(--shadow)}
.hero{position:relative;overflow:hidden;background:linear-gradient(115deg,#1c315f,#1c478a 58%,#306def);color:white;border-radius:21px;min-height:227px;padding:31px 34px;display:grid;grid-template-columns:minmax(0,1fr) 200px;align-items:center;box-shadow:0 12px 30px rgba(30,67,125,.12)}.hero::before{content:"";position:absolute;inset:0;background-image:radial-gradient(#ffffff20 1.2px,transparent 1.2px);background-size:18px 18px;mask-image:linear-gradient(90deg,transparent,black);opacity:.5}.hero:after{content:"";position:absolute;width:350px;height:350px;border-radius:50%;border:1px solid #ffffff20;right:-89px;top:-130px;box-shadow:0 0 0 70px #ffffff06,0 0 0 140px #ffffff04}.hero-content,.hero-visual{z-index:1;position:relative}.hero-tag{display:inline-flex;align-items:center;gap:7px;background:#ffffff1d;color:#dce8ff;font-size:11px;font-weight:700;padding:6px 11px;border:1px solid #ffffff21;border-radius:50px}.hero h2{font-size:27px;line-height:1.18;letter-spacing:-.8px;margin:12px 0 9px;font-weight:780;max-width:520px}.hero p{margin:0;color:#c4d5f5;font-size:13px;max-width:530px}.hero-actions{display:flex;gap:9px;margin-top:23px;flex-wrap:wrap}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:1px solid transparent;border-radius:10px;padding:10px 15px;font-size:13px;font-weight:740;transition:transform .13s,background .13s,box-shadow .13s;line-height:1.3;white-space:normal;text-align:center}.btn:hover:not(:disabled){transform:translateY(-1px)}.btn-primary{background:var(--brand);color:white;box-shadow:0 4px 12px #386efa25}.btn-primary:hover:not(:disabled){background:#275cdb}.btn-white{background:#fff;color:#214f9c}.btn-ghost-white{background:#ffffff16;border:1px solid #ffffff4d;color:white}.btn-muted{background:#f1f5fb;color:#43526b;border:1px solid #e8ecf4}.btn-muted:hover{background:#e9effa}.btn-outline{background:#fff;border:1px solid #dce3ef;color:#354967}.btn-green{background:#17a67e;color:white}.btn-orange{background:#f2a53d;color:#3f2b13}.btn-danger{background:#fff0ed;color:#ac392e}.btn-sm{padding:7px 10px;font-size:11px}.btn-full{width:100%}.hero-ring{width:152px;height:152px;position:relative;margin:auto}.hero-ring svg{width:100%;height:100%;transform:rotate(-90deg)}.hero-ring circle{fill:none;stroke-width:11}.hero-ring .ring-track{stroke:#ffffff24}.hero-ring .ring-progress{stroke:#8bdeca;stroke-linecap:round;transition:stroke-dasharray .4s}.ring-value{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center}.ring-value b{font-size:31px;letter-spacing:-1.1px}.ring-value small{font-size:10px;color:#d3e2ff;text-transform:uppercase;letter-spacing:1px;font-weight:650}
.stats-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:15px;margin-top:19px}.stat-card{padding:18px 19px;min-height:123px}.stat-head{display:flex;align-items:center;justify-content:space-between;gap:8px;color:var(--sub);font-size:12px;font-weight:650}.stat-icon{height:31px;width:31px;display:grid;place-items:center;border-radius:9px}.stat-icon.n{background:var(--new-bg);color:var(--new)}.stat-icon.h{background:var(--hard-bg);color:var(--hard)}.stat-icon.g{background:var(--good-bg);color:var(--good)}.stat-icon.d{background:var(--brand-soft);color:var(--brand)}.stat-value{font-size:31px;font-weight:820;letter-spacing:-1.2px;margin-top:7px;line-height:1.25}.stat-foot{font-size:11px;color:#8b98a9;margin-top:3px}.grid-2{display:grid;grid-template-columns:minmax(0,1.6fr) minmax(270px,1fr);gap:17px}.module-card{padding:22px;position:relative;min-height:180px;overflow:hidden}.module-card .module-icon{height:40px;width:40px;display:grid;place-items:center;border-radius:13px;background:#eaf0ff;color:#326ded;margin-bottom:17px}.module-card.security .module-icon{background:#e8faf6;color:#179d86}.module-card h3{margin:0;font-size:17px;letter-spacing:-.35px}.module-card p{margin:7px 0 13px;color:var(--sub);font-size:12px;max-width:310px}.module-foot{display:flex;justify-content:space-between;align-items:center;gap:12px}.module-tags{color:#8492a7;font-size:11px}.module-number{font-weight:790;font-size:15px;color:var(--brand)}.module-badge{position:absolute;right:18px;top:20px;background:#f0f4fb;border:1px solid #e7edf5;border-radius:20px;padding:4px 9px;font-size:10px;font-weight:780;color:#70839e}.mini-progress{width:100%;height:7px;background:#eaf0f5;border-radius:20px;display:flex;overflow:hidden;margin:16px 0 13px}.p-part{height:100%}.p-good{background:var(--good)}.p-hard{background:#f1ae53}.p-new{background:#d9e0ea}.chapter-list{display:grid;gap:10px}.chapter-item{padding:14px 16px;display:flex;align-items:center;gap:13px;text-align:left;border:1px solid var(--line);background:#fff;border-radius:13px;width:100%;transition:border .15s,box-shadow .15s}.chapter-item:hover{border-color:#bdc9e2;box-shadow:var(--shadow)}.chapter-icon{flex:none;height:38px;width:38px;border-radius:11px;display:grid;place-items:center;color:var(--brand);background:#f0f4ff}.chapter-text{flex:1;min-width:0}.chapter-text strong{display:block;font-size:13px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.chapter-text small{display:block;font-size:11px;color:#8090a6;margin-top:3px}.chapter-right{display:flex;align-items:center;gap:15px;color:#7b8ba6}.chapter-mini{height:5px;background:#e7ecf4;border-radius:10px;width:78px;overflow:hidden}.chapter-mini>span{height:100%;background:var(--good);display:block;border-radius:10px}.help-card{padding:21px;min-height:100%;display:flex;flex-direction:column;gap:14px}.help-icon{background:#f0f5ff;color:var(--brand);border-radius:12px;height:41px;width:41px;display:grid;place-items:center}.help-card strong{font-size:16px}.help-card p{font-size:12px;color:var(--sub);margin:0}.help-rows{display:grid;gap:10px}.help-row{display:flex;align-items:center;gap:10px;font-size:12px;color:#51617b}.help-row .swatch{width:10px;height:10px;border-radius:50%}.plain-link{font-size:12px;color:#386cf4;font-weight:720;border:0;background:transparent;padding:5px 0}.plain-link:hover{text-decoration:underline}
.catalog-toolbar{display:flex;align-items:center;gap:11px;flex-wrap:wrap;margin-bottom:14px}.field{border:1px solid #dfe6f0;background:#fff;border-radius:10px;height:42px;padding:0 12px;color:var(--ink);min-width:0}.field:focus{outline:3px solid #dce8ff;border-color:#8db3ff}.search-box{flex:1;min-width:210px;display:flex;align-items:center;gap:9px;padding:0 12px;color:#8997ab;background:white;border:1px solid #dfe6f0;border-radius:10px}.search-box:focus-within{border-color:#8db3ff;box-shadow:0 0 0 3px #dce8ff}.search-box input{border:0;background:transparent;outline:none;height:42px;flex:1;min-width:0;color:var(--ink)}select.field{max-width:270px;padding-right:23px}.chips{display:flex;gap:8px;flex-wrap:wrap;margin:12px 0 16px}.chip{border:1px solid #dfe6f0;background:#fff;color:#667891;padding:7px 12px;border-radius:8px;font-size:12px;font-weight:660}.chip.active{background:#eaf1ff;color:#2e61db;border-color:#cce0ff}.catalog-counter{margin-left:auto;font-size:11px;color:var(--sub);align-self:center}.question-list{display:grid;gap:10px}.question-row{background:#fff;border:1px solid var(--line);border-radius:14px;padding:16px 18px;display:grid;grid-template-columns:42px minmax(0,1fr) auto;gap:12px;align-items:center}.question-row:hover{border-color:#d6dfec;box-shadow:var(--shadow)}.number-tag{height:39px;width:39px;background:#f3f6fc;color:#7a8ba5;border-radius:11px;display:grid;place-items:center;font-weight:800;font-size:12px}.question-main{min-width:0}.question-main strong{font-size:13px;display:block;line-height:1.45}.question-meta{font-size:11px;color:#8593a9;margin-top:5px;display:flex;gap:10px;flex-wrap:wrap}.question-actions{display:flex;align-items:center;gap:7px}.status{display:inline-flex;align-items:center;gap:5px;font-size:10px;font-weight:790;padding:5px 9px;border-radius:7px;white-space:nowrap}.status:before{content:"";display:block;width:6px;height:6px;border-radius:50%;background:currentColor}.status.new{background:var(--new-bg);color:#6e7f98}.status.hard{background:var(--hard-bg);color:#bf7c1f}.status.easy{background:var(--good-bg);color:#108b69}.empty{padding:47px 20px;text-align:center;background:#fff;border:1px dashed #d5deeb;border-radius:16px}.empty .round{height:52px;width:52px;border-radius:16px;background:#eef3fd;color:#5f7cbb;display:grid;place-items:center;margin:0 auto 15px}.empty h3{margin:0 0 7px}.empty p{color:var(--sub);font-size:13px;margin:0 auto 18px;max-width:440px}
.practice-layout{max-width:810px;margin:0 auto}.session-header{display:flex;align-items:center;justify-content:space-between;gap:9px;margin:0 0 16px}.session-progress{height:7px;background:#e5ebf4;border-radius:50px;overflow:hidden;margin-bottom:22px}.session-progress span{height:100%;display:block;background:var(--brand);border-radius:50px;transition:width .25s}.practice-card{padding:30px 31px 27px}.practice-tag-row{display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap}.practice-title{font-size:23px;line-height:1.35;letter-spacing:-.55px;margin:18px 0 16px;font-weight:780}.case-tag{display:inline-flex;border-radius:6px;background:#fff4e8;color:#b57a29;padding:4px 8px;font-size:10px;font-weight:740}.source-box{background:#f7f9fd;border:1px solid #e9eef7;padding:12px 14px;border-radius:11px;color:#687991;font-size:11px;margin:17px 0 21px;display:flex;align-items:flex-start;gap:9px}.answer-label{font-size:12px;color:#3e4f68;font-weight:750;display:block;margin:0 0 8px}.answer-input{width:100%;min-height:116px;resize:vertical;border:1px solid #dbe3ee;border-radius:11px;padding:13px 14px;color:var(--ink);background:white;line-height:1.55;outline:0}.answer-input:focus{border-color:#77a0fa;box-shadow:0 0 0 3px #e8efff}.practice-buttons{display:flex;align-items:center;justify-content:space-between;gap:9px;flex-wrap:wrap;margin-top:18px}.solution{margin-top:24px;border:1px solid #cceee5;border-radius:13px;background:#f1fcf7;padding:18px 19px}.solution h3{display:flex;align-items:center;gap:8px;color:#07845f;font-size:13px;margin:0 0 11px}.solution p{font-size:14px;line-height:1.75;white-space:pre-line;margin:0;color:#234a3f}.source-citation{margin-top:17px;border-top:1px solid #d4eee5;padding-top:11px;font-size:11px;color:#568b7b}.grade-box{margin-top:15px;background:#f7f9fd;border:1px solid #e7edf5;border-radius:12px;padding:17px}.grade-box h4{font-size:13px;margin:0 0 10px}.grade-actions{display:flex;gap:10px}.grade-actions button{flex:1;padding:12px}.session-end{text-align:center;padding:45px 28px}.session-end .end-icon{height:72px;width:72px;background:var(--good-bg);color:var(--good);border-radius:21px;display:grid;place-items:center;margin:0 auto 16px}.session-end h2{font-size:26px;margin:0 0 7px}.session-end p{font-size:13px;color:var(--sub)}.result-grid{display:flex;justify-content:center;gap:22px;margin:25px 0}.result-grid b{display:block;font-size:27px}.result-grid small{color:var(--sub)}
.analytics-grid{display:grid;grid-template-columns:1.4fr 1fr;gap:16px}.analytics-card{padding:22px}.analytics-card h3{font-size:15px;margin:0 0 6px}.analytics-card p{font-size:12px;color:var(--sub);margin:0 0 17px}.bar-row{display:grid;grid-template-columns:170px minmax(0,1fr) 40px;align-items:center;gap:14px;margin:17px 0;font-size:12px}.bar-track{width:100%;height:10px;background:#edf1f7;border-radius:30px;overflow:hidden}.bar-fill{background:var(--good);height:100%;border-radius:30px}.activity-grid{display:grid;grid-template-columns:repeat(7,1fr);align-items:end;gap:9px;height:160px;margin-top:14px}.activity-day{display:flex;flex-direction:column;align-items:center;justify-content:flex-end;gap:7px;height:100%;color:#8a96aa;font-size:11px}.activity-column{background:#edf1fa;width:min(34px,100%);min-height:6px;border-radius:7px 7px 3px 3px}.activity-column.positive{background:linear-gradient(#5f90fc,#3573f4)}.activity-day b{font-size:10px;color:#6e7e96}.settings-card{padding:24px;margin-top:15px}.settings-card h3{margin:0 0 7px;font-size:16px}.settings-card p{font-size:12px;color:var(--sub);margin:0 0 16px;max-width:640px}.settings-actions{display:flex;align-items:center;gap:9px;flex-wrap:wrap}.warning{background:#fff9ee;border:1px solid #f6e0b9;border-radius:10px;padding:13px;color:#8a681d;font-size:12px}.info{background:#eef5ff;border:1px solid #d9e7ff;border-radius:10px;padding:13px;color:#4566a3;font-size:12px}.settings-card hr{border:0;border-top:1px solid var(--line);margin:20px 0}
.modal-shade{position:fixed;inset:0;z-index:70;background:rgba(12,25,48,.52);display:flex;align-items:center;justify-content:center;padding:18px}.modal{background:#fff;border-radius:18px;box-shadow:0 20px 70px rgba(10,20,42,.25);padding:24px;width:min(630px,100%);max-height:90vh;overflow-y:auto}.modal h2{font-size:19px;margin:0}.modal-sub{font-size:12px;color:var(--sub);margin:5px 0 20px}.modal-top{display:flex;justify-content:space-between;gap:10px}.icon-button{width:32px;height:32px;border:0;border-radius:9px;display:grid;place-items:center;background:#f2f5fa;color:#677a98}.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:13px}.form-control{display:grid;gap:6px}.form-control.full{grid-column:1/-1}.form-control label{font-size:11px;font-weight:750;color:#495973}.form-control .field{width:100%}.form-control textarea{min-height:90px;padding:10px 12px;resize:vertical}.form-actions{display:flex;justify-content:space-between;gap:10px;margin-top:19px}.toast{position:fixed;right:25px;bottom:22px;z-index:90;max-width:min(380px,calc(100vw - 44px));background:#192d4d;color:#f7faff;padding:12px 16px;border-radius:11px;box-shadow:0 8px 30px #14294a44;font-size:12px;font-weight:670;animation:pop .24s ease}@keyframes pop{from{transform:translateY(12px);opacity:0}to{transform:translateY(0);opacity:1}}.overlay{display:none}.pill{border-radius:50px;padding:5px 10px;background:#f0f4fb;color:#6c7f98;font-size:11px;font-weight:700;display:inline-flex;align-items:center;gap:5px}.pill.soon{color:#5583aa;background:#edf7fa}.footer-note{font-size:11px;text-align:center;color:#9aa6b6;margin:30px 0 0}.text-muted{color:var(--sub)}.text-sm{font-size:12px}.divider{border-top:1px solid var(--line);margin:17px 0}.hide{display:none!important}
@media(max-width:1170px){.shell{grid-template-columns:236px minmax(0,1fr)}.topbar{padding:0 28px}.body-content{padding:28px 28px 65px}.stats-grid{gap:10px}.stat-card{padding:15px}.stat-head{font-size:11px}}
@media(max-width:900px){.stats-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.grid-2,.analytics-grid{grid-template-columns:1fr}.hero{grid-template-columns:1fr 150px}.hero-ring{height:132px;width:132px}.module-card{min-height:150px}.chapter-mini{width:100px}}
@media(max-width:700px){.shell{display:block}.side{position:fixed;top:0;left:0;width:276px;transform:translateX(-105%);transition:transform .2s;box-shadow:8px 0 35px #0814272a}.side.open{transform:translateX(0)}.overlay.open{display:block;position:fixed;inset:0;z-index:22;background:#0b162db3}.mobile-menu{display:block}.topbar{height:66px;padding:0 18px}.top-actions .top-mini{display:none}.body-content{padding:23px 15px 52px}.page-title{font-size:25px}.hero{padding:25px 22px;grid-template-columns:1fr;min-height:245px}.hero h2{font-size:25px}.hero-visual{display:none}.stats-grid{gap:9px;margin-top:12px}.stat-card{padding:13px 14px;min-height:112px}.stat-value{font-size:27px}.stat-head{font-size:11px}.section-heading{margin-top:24px}.catalog-toolbar{gap:8px}.search-box{min-width:100%;flex-basis:100%}select.field{max-width:none;flex:1}.question-row{grid-template-columns:35px minmax(0,1fr);gap:9px;padding:13px}.number-tag{width:34px;height:34px}.question-actions{grid-column:2;justify-content:space-between;margin-top:1px}.question-actions .btn{min-width:105px}.question-meta{gap:6px}.bar-row{grid-template-columns:105px minmax(0,1fr) 29px;gap:9px;font-size:11px}.practice-card{padding:23px 19px}.practice-title{font-size:20px}.grade-actions{flex-direction:column}.practice-buttons{align-items:stretch}.practice-buttons .btn{flex:1}.form-grid{grid-template-columns:1fr}.modal{padding:19px}.form-control.full{grid-column:auto}.module-card{padding:20px}.section-note{font-size:11px}.chapter-mini{width:68px}.footer-note{padding:0 12px}}
@media(max-width:390px){.stats-grid{grid-template-columns:1fr 1fr}.stat-icon{height:27px;width:27px}.stat-card{padding:10px}.stat-head{font-size:10px}.stat-value{font-size:26px}.question-actions{gap:3px}.practice-buttons .btn{padding:9px 10px}.hero-actions{flex-direction:column;align-items:stretch}}
@media print{.side,.topbar,.hero-actions,.top-actions,.footer-note,.practice-buttons,.btn,.catalog-toolbar,.chips{display:none!important}.shell{display:block}.body-content{padding:0}.surface,.hero{box-shadow:none}.hero{background:#fff;color:#111;border:1px solid #ddd}.hero h2,.hero p{color:#111}}
/* Version 2: dynamischer Textimport */
.import-teaser{margin:15px 0 18px;padding:17px 21px;display:flex;align-items:center;justify-content:space-between;gap:15px}
.import-teaser strong{display:flex;align-items:center;gap:9px;font-size:13px}
.import-teaser p{margin:5px 0 0;color:var(--sub);font-size:12px}
.import-form-grid,.import-options{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}
.import-options{margin-top:16px}
.import-form-grid .form-control,.import-options .form-control{min-width:0}
.import-raw{display:block;width:100%;min-height:215px;padding:14px!important;line-height:1.6;resize:vertical}
#text-import-form .plain-link{margin-top:9px}
.preview-title{display:flex;align-items:start;justify-content:space-between;gap:15px;margin-bottom:17px}
.import-preview-list{display:grid;gap:14px}
.preview-card{background:#f9fbff;border:1px solid #dee7f4;padding:16px;border-radius:13px;display:grid;gap:11px}
.preview-card-head{display:flex;align-items:center;justify-content:space-between;gap:8px}
.import-check{display:flex;align-items:center;gap:9px;cursor:pointer;font-size:12px;color:var(--ink)}
.import-check input{height:18px;width:18px;accent-color:var(--brand)}
.preview-fields{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}
.preview-card textarea{min-height:68px;resize:vertical;padding:10px 12px}
.preview-card .form-control.full{grid-column:1/-1}
.save-import-row{display:flex;justify-content:space-between;gap:16px;align-items:center;margin-top:18px;flex-wrap:wrap}
.save-import-row p{flex:1;margin:0;color:var(--sub);font-size:12px}
@media(max-width:700px){.import-teaser{flex-direction:column;align-items:stretch}.import-form-grid,.import-options,.preview-fields{grid-template-columns:1fr}.preview-title{flex-direction:column}.save-import-row button{width:100%}}
.side{overflow-y:auto}

/* Accessible controls and account/server states, preserving the existing UI. */
html{scroll-padding-top:1rem}
:focus-visible{outline:3px solid #2457c6;outline-offset:3px}
.btn,.icon-button,.top-mini,.mobile-menu,.nav-button,.chip,.plain-link{min-height:44px}
.icon-button,.mobile-menu{min-width:44px}
.field,.search-box input{min-height:44px}
.import-check{min-height:44px}
.btn:disabled,button:disabled{cursor:wait;opacity:.65;transform:none}
.skip-link{position:fixed;top:10px;left:10px;z-index:120;transform:translateY(-180%);background:#fff;color:#173769;border:2px solid #2457c6;border-radius:8px;padding:12px 16px;font-weight:700}
.skip-link:focus{transform:translateY(0)}
.noscript-notice{margin:24px auto;padding:20px;max-width:640px;background:#fff9ee;border:1px solid #d3ad65;border-radius:12px;color:#584216}
.login-shell{min-height:100svh;display:grid;place-items:center;padding:32px 20px;background:var(--bg)}
.login-card{width:min(100%,460px);padding:32px;background:var(--surface);border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow)}
.login-card h1{font-size:26px;line-height:1.25;margin:8px 0 12px;letter-spacing:-.6px}
.login-card p{color:var(--sub);font-size:14px;line-height:1.6}
.login-form{display:grid;gap:16px;margin-top:24px}
.login-form .field{width:100%}
.login-form .btn{width:100%;margin-top:4px}
.account-bar{display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap}
.account-name{font-weight:700;overflow-wrap:anywhere}
.account-role{font-size:12px;color:var(--sub)}
.connection-banner{display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap;padding:13px 16px;margin-bottom:18px;border:1px solid #c7d8ed;border-radius:11px;background:#eef5ff;color:#294a77;font-size:13px;line-height:1.5;overflow-wrap:anywhere}
.connection-banner.is-error{background:#fff4ec;border-color:#e5ba97;color:#7c3f19}
.connection-banner p{margin:0;flex:1;min-width:180px}
.connection-banner .btn{flex:none}
.question-main,.solution,.source-box,.preview-card{overflow-wrap:anywhere}
@media(max-width:700px){
  .field,.answer-input,.search-box input{font-size:16px}
  .login-shell{padding:20px 15px}
  .login-card{padding:24px 20px}
  .account-bar{gap:8px}
  .account-bar .btn{padding:9px 11px}
  .connection-banner{align-items:stretch}
  .connection-banner .btn{width:100%}
}
@media(prefers-reduced-motion:reduce){
  *,*::before,*::after{animation:none!important;transition:none!important;scroll-behavior:auto!important}
}
/* Keep the mobile header usable without clipped account actions. */
@media(max-width:700px){
  .topbar{height:auto;min-height:66px;padding:10px 15px;gap:8px;align-items:flex-start;flex-direction:column}
  .topbar .account-bar{width:100%;flex-wrap:nowrap;justify-content:flex-start}
  .topbar .account-bar:last-child{justify-content:flex-end}
  .topbar .account-name{margin-right:auto;font-size:12px;max-width:35%;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
  .side:not(.open){visibility:hidden}
  .side.open{visibility:visible}
}

/* Version 2.2: learning on the phone is the primary layout. */
:root{
  --sub:#52627a;
  --brand:#285dd8;
  --brand-soft:#edf3ff;
  --bottom-nav-height:72px;
  --phone-safe-bottom:env(safe-area-inset-bottom,0px);
}
html{scroll-padding-bottom:calc(var(--bottom-nav-height) + var(--phone-safe-bottom) + 24px)}
body{font-size:15px;line-height:1.55}
button,a,input,textarea,select,summary{-webkit-tap-highlight-color:transparent}
button,summary{touch-action:manipulation}
button:disabled{cursor:not-allowed}
button[aria-busy="true"]{cursor:wait}
.btn:hover:not(:disabled){transform:none}
.btn-primary{box-shadow:none}
.btn-green{background:#087b59;color:#fff}
.btn-orange{background:#fff1db;color:#72430a;border-color:#e7bd7c}
.status{font-size:11px}
.status.hard{color:#7b4c0c}
.status.easy{color:#066649}
.status.new{color:#53647b}
.pill{color:#4e617d;min-width:0;max-width:100%;overflow-wrap:anywhere}
.stat-foot,.question-meta,.chapter-text small,.footer-note{color:#5f6f85}
.btn,.icon-button,.plain-link,.nav-button,.chip,.account-button{min-height:46px}
.form-control{min-width:0}
.form-grid>.full{grid-column:1/-1}
.form-grid>.btn{align-self:end}
.form-control label,.answer-label{font-size:13px;line-height:1.4}
.field,.answer-input,.search-box input{font-size:16px}
.field{height:46px}
textarea.field{height:auto}
.field:focus-visible,.answer-input:focus-visible{outline:3px solid #2457c6;outline-offset:2px}
:where(.page-heading,.study-home,.start-card,.resume-card,.settings-group,.save-notice,.import-summary){min-width:0;overflow-wrap:anywhere}
.page-heading{display:flex;flex-direction:column;align-items:flex-start;gap:6px;margin-bottom:22px}
.page-heading h1,.page-heading .page-title{margin:0 0 6px;font-size:29px;line-height:1.2;letter-spacing:-.8px}
.page-heading p{margin:0;color:var(--sub)}
.page-heading .eyebrow{margin-bottom:7px}
.page-description{font-size:15px;line-height:1.55}
.topbar{height:auto;min-height:76px;padding:14px 32px}
.brand-name{display:flex;align-items:center;gap:10px;min-width:0;font-size:16px;font-weight:800;letter-spacing:-.3px}
.account-button{display:inline-flex;align-items:center;justify-content:center;gap:8px;max-width:50%;padding:8px 12px;border:1px solid #d9e2ee;border-radius:10px;background:#fff;color:#334963;font-size:13px;font-weight:650;overflow-wrap:anywhere}
.account-button .ic{flex:none}
.body-content{max-width:1140px;padding:28px 32px 48px}
.login-page{min-height:100svh;display:grid;place-items:center;padding:32px 20px;background:var(--bg)}
.brand-icon{width:48px;height:48px;border-radius:13px;display:grid;place-items:center;background:#edf3ff;color:#2457c6;margin-bottom:16px}
.side{padding:24px 15px 20px}
.side-brand{padding-bottom:24px}
.nav-button{font-size:14px;padding:13px 14px}
.nav-button.is-active{background:#263b5e;box-shadow:inset 3px 0 0 #8ab0ff}
.bottom-nav{display:none}
.study-home{max-width:820px;margin:0 auto}
.module-switch{display:flex;gap:6px;padding:5px;border:1px solid #d7e1ed;background:#eaf0f7;border-radius:13px;margin:0 0 20px;min-width:0}
.module-switch>button{flex:1;min-width:0;min-height:48px;display:flex;align-items:center;justify-content:center;gap:8px;padding:10px 12px;border:1px solid transparent;background:transparent;color:#4b5f79;border-radius:9px;font-size:14px;font-weight:750;line-height:1.3;overflow-wrap:anywhere}
.module-switch>button[aria-pressed="true"],.module-switch>button.is-active{background:#fff;color:#1d4eb8;border-color:#d0ddf5;box-shadow:0 1px 3px #18375b0c}
.module-switch .ic{flex:none}
.learning-summary{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px;margin:16px 0 20px}
.learning-summary>div,.learning-summary>.summary-item{min-width:0;padding:16px;background:#fff;border:1px solid var(--line);border-radius:13px;display:flex;flex-direction:column;gap:3px}
.learning-summary strong,.learning-summary b{font-size:28px;font-weight:800;line-height:1.15;letter-spacing:-.6px}
.learning-summary small,.learning-summary span,.summary-label{font-size:12px;line-height:1.4;color:var(--sub)}
.start-card{padding:24px;border:1px solid #cdddf6;border-radius:16px;background:#f0f5ff;margin:16px 0}
.start-card h2,.resume-card h2{margin:0 0 8px;font-size:21px;line-height:1.3;letter-spacing:-.4px}
.start-card p,.resume-card p{margin:0 0 18px;font-size:14px;color:#455c7b;max-width:570px}
.start-card .btn-primary{min-height:52px;font-size:15px;padding:13px 22px}
.start-card .settings-actions{margin-top:15px}
.learning-actions{display:flex;flex-wrap:wrap;gap:10px;margin:15px 0 24px}
.learning-actions>.btn{flex:1;min-width:160px}
.resume-card{padding:21px 24px;border:1px solid #a7c4f2;border-left:4px solid #285dd8;border-radius:14px;background:#fff;margin:16px 0}
.resume-card .btn{min-height:48px}
.resume-card .settings-actions{align-items:stretch}
.chapter-list{gap:9px}
.chapter-item{min-height:72px}
.chapter-text strong{white-space:normal;font-size:14px;line-height:1.4}
.chapter-text small{font-size:12px}
.chapter-mini{width:64px}
.practice-layout{max-width:780px}
.session-header{font-size:13px;align-items:center;flex-wrap:wrap;margin-bottom:12px}
.session-header .btn,.session-header .plain-link{min-height:44px}
.session-progress{margin-bottom:16px;height:6px}
.practice-card{padding:26px}
.practice-title{font-size:24px;line-height:1.4;letter-spacing:-.4px;margin:20px 0 22px;overflow-wrap:anywhere}
.practice-tag-row{align-items:center;gap:8px}
.answer-details,.metadata-fields,.filters-details{min-width:0;border:1px solid #dce4ef;border-radius:11px;background:#fff;margin:16px 0}
.answer-details>summary,.metadata-fields>summary,.filters-details>summary{cursor:pointer;min-height:48px;padding:12px 14px;color:#334c6e;font-size:14px;font-weight:650;line-height:1.5}
.answer-details>summary:focus-visible,.metadata-fields>summary:focus-visible,.filters-details>summary:focus-visible{outline:3px solid #2457c6;outline-offset:2px;border-radius:8px}
.answer-details[open]>summary,.metadata-fields[open]>summary,.filters-details[open]>summary{border-bottom:1px solid #e5eaf2;margin-bottom:14px}
.answer-details>.answer-input,.answer-details>textarea{display:block;width:calc(100% - 28px);margin:0 14px 14px;min-height:105px}
.answer-details>.form-control{margin:0 14px 14px}
.answer-details>.answer-label{margin:0 14px 7px}
.answer-details>p{margin:0 14px 14px;color:var(--sub);font-size:13px}
.metadata-fields>.form-grid,.metadata-fields>.preview-fields,.filters-details>.form-grid,.filters-details>.catalog-toolbar{padding:0 14px 14px;margin:0}
.metadata-fields>.form-control,.filters-details>.form-control{margin:0 14px 14px}
.metadata-fields .form-control.full{grid-column:1/-1}
.solution{margin-top:18px;padding:19px;border-color:#c4e1d8;background:#f1f8f5}
.solution h3{font-size:14px;color:#076447}
.solution h2{font-size:16px;line-height:1.4;color:#076447;margin:0 0 11px}
.solution p{font-size:16px;line-height:1.7;color:#1c3c32}
.source-box{font-size:12px;line-height:1.6;margin:14px 0 0;color:#52637a}
.source-citation{font-size:12px;line-height:1.6;color:#3f6d5e}
.study-actions{position:sticky;bottom:16px;z-index:20;display:flex;gap:10px;align-items:stretch;padding:12px;margin:18px -12px -12px;background:#fff;border:1px solid #dce5ef;border-radius:13px;box-shadow:0 4px 15px #213a5810}
.study-actions>.btn{flex:1;min-height:52px;font-size:14px;line-height:1.35;padding:12px}
.study-actions>.btn-primary:only-child{width:100%}
.study-actions .ic{flex:none}
.study-actions .btn small{display:block;font-size:11px;font-weight:500}
.save-notice{padding:12px 15px;background:#edf8f2;border:1px solid #bfdcca;border-radius:11px;color:#265b3d;font-size:13px;line-height:1.55;margin:0 0 16px;display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap}
.save-notice p{margin:0;flex:1;min-width:160px}
.save-notice .btn,.save-notice .plain-link{flex:none;min-height:44px}
.connection-banner{font-size:14px}
.connection-banner p{min-width:0}
.catalog-toolbar{align-items:stretch;gap:10px}
.catalog-toolbar .search-box{flex-basis:100%}
.filters-details{margin:0 0 16px}
.filters-details .field{width:100%;max-width:none}
.filter-row{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px;padding:0 14px 14px}
.filter-row>label{display:grid;gap:6px;min-width:0;font-size:13px;font-weight:650;color:#334c6e}
.card-tools{display:flex;gap:9px;flex-wrap:wrap;align-items:center;margin:12px 0 18px}
.card-tools .btn{min-height:46px}
.question-row{grid-template-columns:minmax(0,1fr) auto;padding:16px;gap:16px;margin-bottom:10px;align-items:start}
.question-main strong{font-size:15px;line-height:1.5}
.question-meta{font-size:12px;line-height:1.5}
.question-actions .btn{font-size:12px}
.question-actions{flex-wrap:wrap;justify-content:flex-end;max-width:260px}
.card-meta-details{margin-top:9px;min-width:0;overflow-wrap:anywhere}
.card-meta-details>summary{min-height:46px;padding:11px 0;color:#305783;font-size:13px;font-weight:650;cursor:pointer;line-height:1.6}
.card-meta-details[open]>summary{margin-bottom:5px}
.card-meta-details>p{font-size:15px;line-height:1.7;margin:0 0 12px;white-space:normal}
.card-meta-details>small{display:block;font-size:12px;color:#52627a;line-height:1.6}
.solution .card-meta-details{border-top:1px solid #cce0d8;margin-top:16px;padding-top:4px}
.solution .card-meta-details>p{font-size:13px;margin-bottom:7px}
.preview-card{background:#fff;padding:18px}
.review-card{padding:22px;margin:16px 0;min-width:0;overflow-wrap:anywhere}
.review-card h3{font-size:16px;line-height:1.4;margin:0 0 17px}
.review-card textarea{min-height:104px;line-height:1.6;resize:vertical}
.review-card>.warning{margin:0 0 16px}
.review-card>.metadata-fields{margin:16px 0}
.preview-actions{display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap}
.confirm-card{display:flex;align-items:center;gap:10px;min-height:52px;flex:1;min-width:210px;padding:10px 12px;border:1px solid #cbdcf5;border-radius:10px;background:#f0f5ff;color:#294a77;font-size:14px;font-weight:650;line-height:1.5;cursor:pointer}
.confirm-card input{flex:none;width:22px;height:22px;margin:0;accent-color:var(--brand)}
.confirm-card:has(input:checked){background:#edf8f2;border-color:#a9d4bb;color:#25573d}
.confirm-card:focus-within{outline:3px solid #2457c6;outline-offset:2px}
#import-preview{scroll-margin-top:18px}
#text-import-form>.form-control{margin-top:18px}
#import-review-form>.settings-actions{margin:20px 0}
.preview-card-head{align-items:flex-start;flex-wrap:wrap}
.import-check{font-size:14px;min-height:48px}
.import-check input{width:22px;height:22px;flex:none}
.import-summary{padding:12px 15px;border-radius:11px;background:#eef4ff;border:1px solid #cfdef5;color:#2f507c;font-size:14px;line-height:1.6;margin:15px 0;display:flex;flex-wrap:wrap;gap:6px 18px}
.import-summary p{margin:0}
.preview-pagination{display:flex;justify-content:space-between;align-items:center;gap:10px;flex-wrap:wrap;margin:17px 0}
.preview-pagination>span,.preview-pagination>p{font-size:13px;color:var(--sub);margin:0;text-align:center}
.preview-pagination>.btn{min-height:46px}
.import-raw{font-size:16px;min-height:190px}
.preview-card .metadata-fields{margin:4px 0 0}
.preview-title h2{font-size:21px;margin:0 0 8px;line-height:1.3}
.preview-title p{font-size:14px;line-height:1.5;margin:0}
.save-import-row p{font-size:13px;min-width:160px}
.settings-group{padding:22px;margin:16px 0;border:1px solid var(--line);border-radius:15px;background:#fff}
.settings-group h2{font-size:18px;line-height:1.35;margin:0 0 8px;letter-spacing:-.2px}
.settings-group h3{font-size:16px;margin:0 0 8px}
.settings-group p,.settings-card p{font-size:14px;line-height:1.6;color:var(--sub)}
.settings-group .form-grid{margin-top:16px}
.settings-group .settings-actions{margin-top:16px}
.settings-group>.btn{margin-top:6px}
.settings-card{padding:22px}
.settings-card h2{margin:0 0 16px;font-size:18px;line-height:1.4;letter-spacing:-.2px}
.settings-card>.settings-actions{margin-bottom:16px}
details.settings-card{padding:0 22px}
details.settings-card>summary{cursor:pointer;min-height:58px;padding:17px 0;font-size:15px;line-height:1.5;font-weight:700;overflow-wrap:anywhere;color:#334c6e}
details.settings-card[open]>summary{border-bottom:1px solid var(--line);margin-bottom:18px}
details.settings-card[open]>:last-child{margin-bottom:22px}
.warning>summary{min-height:48px;padding:10px 0;cursor:pointer;font-weight:700;line-height:1.5}
.warning[open]>summary{margin-bottom:10px}
.warning p,.warning li{overflow-wrap:anywhere;line-height:1.6}
.warning ul{padding-left:20px}
.settings-card>.chapter-item+.chapter-item{margin-top:9px}
.progress-list{margin:2px 0 18px}
.progress-row{display:flex;align-items:center;justify-content:space-between;gap:18px;padding:14px 0;border-bottom:1px solid #e5eaf2;font-size:14px;line-height:1.5}
.progress-row:last-child{border-bottom:0}
.progress-row>span{min-width:0;overflow-wrap:anywhere}
.progress-row>strong{flex:none;text-align:right;font-size:18px;line-height:1.35}
.progress-row small{display:block;color:var(--sub);font-size:12px;font-weight:400;margin-top:4px}
.settings-actions .btn{min-height:46px}
.warning,.info{font-size:13px;line-height:1.6}
.warning{color:#755117;border-color:#ead0a2}
.info{color:#345683}
.modal{max-height:calc(100dvh - 36px);overscroll-behavior:contain}
body:has(.modal-shade){overflow:hidden}
.modal .form-actions{align-items:center;flex-wrap:wrap}
.modal .metadata-fields{grid-column:1/-1}
.modal-top{align-items:center}
.modal-top .icon-button{flex:none}
.empty{padding:30px 20px}
.empty p{font-size:14px}
.result-grid{flex-wrap:wrap;gap:20px}
.result-grid>div{min-width:62px}
.session-end{padding:32px 24px}
.footer-note{font-size:12px;line-height:1.6}

@media(max-width:1000px) and (min-width:701px){
  .shell{grid-template-columns:210px minmax(0,1fr)}
  .body-content{padding:24px 22px 40px}
  .topbar{padding:12px 22px}
  .side-brand{padding-left:3px;padding-right:3px}
  .brand-title{font-size:15px}
  .brand-sub{font-size:10px}
  .learning-summary>div{padding:13px}
  .question-row{grid-template-columns:minmax(0,1fr)}
  .question-actions{grid-column:1;justify-content:flex-start;max-width:none}
}

@media(max-width:700px){
  body{font-size:15px}
  .shell{display:block;min-height:100svh}
  .side,.side.open,.mobile-menu,.overlay,.overlay.open{display:none!important}
  .main{min-height:100svh;padding-bottom:calc(var(--bottom-nav-height) + var(--phone-safe-bottom))}
  .topbar{min-height:64px;padding:10px 16px;gap:12px;flex-direction:row;align-items:center;justify-content:space-between}
  .topbar .account-bar{width:auto;min-width:0;flex-wrap:nowrap;gap:8px}
  .topbar .account-bar:last-child{justify-content:flex-end}
  .topbar .account-name{max-width:120px;margin:0;font-size:12px}
  .brand-name{font-size:15px;line-height:1.3}
  .brand-name .ic{width:24px;height:24px;flex:none}
  .account-button{min-height:44px;max-width:46%;padding:8px 10px;font-size:12px}
  .body-content{padding:20px 16px 28px}
  .page-heading{gap:10px;margin-bottom:18px}
  .page-heading h1,.page-heading .page-title,.page-title{font-size:25px;line-height:1.25;letter-spacing:-.65px}
  .page-description{margin-bottom:20px}
  .eyebrow{font-size:10px;letter-spacing:1.1px}
  .btn,.icon-button,.plain-link,.chip,.account-button{min-height:48px}
  .icon-button{min-width:48px}
  .btn{font-size:14px;padding:12px 14px}
  .btn-sm{font-size:12px;padding:10px 12px}
  .field,.search-box input{min-height:48px;height:48px;font-size:16px}
  textarea.field{height:auto}
  .module-switch{margin-bottom:16px;padding:4px;gap:4px}
  .module-switch>button{font-size:14px;min-height:48px;padding:10px 7px;gap:6px}
  .module-switch>button .ic{width:18px;height:18px}
  .learning-summary{gap:8px;margin:14px 0 17px}
  .learning-summary>div,.learning-summary>.summary-item{padding:13px 11px;border-radius:11px}
  .learning-summary strong,.learning-summary b{font-size:27px}
  .learning-summary small,.learning-summary span{font-size:12px}
  .start-card{padding:20px;margin:15px 0}
  .start-card h2,.resume-card h2{font-size:20px;line-height:1.3}
  .start-card p,.resume-card p{font-size:14px;margin-bottom:16px}
  .start-card>.btn-primary,.resume-card>.btn-primary{width:100%;min-height:52px}
  .start-card .btn-primary{font-size:15px}
  .resume-card{padding:18px;margin:15px 0}
  .resume-card .settings-actions>.btn{flex:1;min-width:120px}
  .learning-actions{gap:8px;margin:14px 0 22px}
  .learning-actions>.btn{min-width:calc(50% - 4px);font-size:13px;padding:11px 8px}
  .section-heading{margin:23px 0 12px;align-items:flex-start;flex-wrap:wrap}
  .section-heading h2{font-size:17px}
  .chapter-item{padding:13px;gap:10px}
  .chapter-icon{width:34px;height:34px;border-radius:9px}
  .chapter-text strong{font-size:14px}
  .chapter-right{gap:7px}
  .chapter-mini{width:34px}
  .practice-card{padding:20px 17px;border-radius:15px}
  .practice-title{font-size:22px;line-height:1.45;margin:19px 0 22px}
  .practice-tag-row .pill{max-width:100%;overflow-wrap:anywhere}
  .session-header{font-size:13px;gap:8px}
  .session-header .pill{font-size:12px}
  .session-progress{margin-bottom:15px}
  .answer-details{margin:14px 0}
  .answer-details>summary,.metadata-fields>summary,.filters-details>summary{font-size:14px;min-height:48px}
  .answer-input{font-size:16px;min-height:120px;padding:12px;line-height:1.6}
  .solution{padding:16px;margin-top:18px;border-radius:11px}
  .solution p{font-size:16px;line-height:1.65}
  .source-box{padding:11px;line-height:1.6}
  .study-actions{bottom:calc(var(--bottom-nav-height) + var(--phone-safe-bottom) + 8px);margin:18px -9px -9px;padding:9px;gap:8px;border-radius:12px;box-shadow:0 3px 18px #142d471a}
  .study-actions>.btn{min-height:54px;font-size:14px;line-height:1.3;padding:12px 9px}
  .practice-layout:has(textarea:focus) .study-actions{position:static}
  .save-notice{font-size:13px;padding:12px;gap:8px}
  .save-notice p{min-width:0;flex-basis:100%}
  .save-notice .btn{padding:9px 12px}
  .catalog-toolbar .search-box{min-width:0;flex-basis:100%;width:100%}
  .search-box{min-width:0}
  .card-tools{gap:8px;margin:10px 0 16px}
  .card-tools>.btn{flex:1;min-width:120px;font-size:13px}
  .question-row{grid-template-columns:minmax(0,1fr);padding:14px;gap:9px}
  .number-tag{width:28px;height:32px;background:transparent;font-size:12px}
  .question-main strong{font-size:15px;line-height:1.5}
  .question-actions{grid-column:1;gap:8px;justify-content:flex-start;flex-wrap:wrap;margin-top:6px;max-width:none}
  .question-actions .btn{min-width:100px;font-size:13px}
  .question-actions .icon-button{margin-left:auto}
  .question-meta{gap:5px 10px}
  .chips{gap:6px}
  .chip{font-size:12px;padding:9px 10px}
  .catalog-counter{flex-basis:100%;margin:4px 0 0;font-size:12px}
  .filters-details .form-grid,.metadata-fields .form-grid{grid-template-columns:minmax(0,1fr)}
  .settings-group,.settings-card{padding:19px 16px;margin-top:14px}
  details.settings-card{padding:0 16px}
  details.settings-card>summary{min-height:60px;padding:18px 0;font-size:15px}
  details.settings-card[open]>:last-child{margin-bottom:19px}
  .settings-group .settings-actions,.settings-card .settings-actions{align-items:stretch}
  .settings-group .settings-actions>.btn,.settings-card .settings-actions>.btn{flex:1;min-width:120px}
  .settings-group h2{font-size:18px}
  .settings-group p,.settings-card p{font-size:14px}
  .form-grid,.import-form-grid,.preview-fields{grid-template-columns:minmax(0,1fr);gap:14px}
  .filter-row{grid-template-columns:minmax(0,1fr);gap:12px}
  .card-meta-details>summary{min-height:48px;font-size:14px}
  .progress-row{gap:12px;font-size:14px}
  .progress-row>strong{font-size:17px}
  .form-control.full,.metadata-fields .form-control.full{grid-column:auto}
  select.field{max-width:100%;width:100%;flex:initial}
  .preview-card{padding:15px;gap:13px}
  .review-card{padding:17px 14px;margin:14px 0}
  .review-card h3{font-size:16px}
  .review-card textarea{min-height:112px;font-size:16px}
  .preview-actions{align-items:stretch;gap:9px}
  .confirm-card{flex-basis:100%;min-width:0;min-height:56px;padding:12px;font-size:14px}
  .preview-actions>.btn{width:100%;min-height:48px}
  #import-review-form>.settings-actions{align-items:stretch;gap:9px}
  #import-review-form>.settings-actions>.btn{flex-basis:100%;min-height:50px}
  .preview-card textarea{min-height:96px;font-size:16px}
  .preview-title{gap:12px}
  .preview-title h2{font-size:20px}
  .preview-title .btn{min-height:44px}
  .preview-card-head .status{font-size:11px}
  .import-check{font-size:14px;line-height:1.4}
  .import-summary{padding:12px;font-size:13px;gap:5px 12px}
  .preview-pagination{gap:8px}
  .preview-pagination>.btn{flex:1;font-size:13px;padding:11px 9px}
  .preview-pagination>span,.preview-pagination>p{flex:1;min-width:70px;font-size:12px}
  .save-import-row{align-items:stretch;gap:12px}
  .save-import-row p{flex-basis:100%;min-width:0}
  .save-import-row .btn{width:100%}
  .modal-shade{padding:10px;align-items:center}
  .modal{padding:19px 16px;width:100%;max-height:calc(100dvh - 20px);border-radius:15px}
  .modal h2{font-size:20px}
  .modal .form-actions>.btn{flex:1;min-width:110px}
  .modal .form-actions>div{flex:1}
  .bottom-nav{position:fixed;z-index:35;left:0;right:0;bottom:0;height:calc(var(--bottom-nav-height) + var(--phone-safe-bottom));padding:5px 8px calc(5px + var(--phone-safe-bottom));display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:3px;background:#fff;border-top:1px solid #d6e0ed;box-shadow:0 -3px 14px #253b5509}
  .bottom-nav-button{min-width:0;min-height:58px;border:0;border-radius:10px;background:transparent;color:#53647a;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:4px;padding:6px 2px;font-size:11px;font-weight:650;line-height:1.15;text-align:center;overflow-wrap:anywhere}
  .bottom-nav-button .ic{width:22px;height:22px;flex:none}
  .bottom-nav-button.is-active,.bottom-nav-button[aria-current="page"]{background:#edf3ff;color:#1c4db8;font-weight:800}
  .bottom-nav-button:focus-visible{outline:3px solid #2457c6;outline-offset:-3px}
  .toast{left:16px;right:16px;bottom:calc(var(--bottom-nav-height) + var(--phone-safe-bottom) + 12px);max-width:none;font-size:13px;line-height:1.5;padding:13px 15px}
  .footer-note{font-size:11px;margin-top:25px;padding:0 5px}
  .login-shell{padding:20px 16px}
  .login-page{padding:20px 14px calc(20px + var(--phone-safe-bottom))}
  .login-card{padding:25px 21px}
  .login-card .btn{min-height:50px}
  .connection-banner{padding:13px;font-size:13px;gap:8px}
  .connection-banner .btn{width:auto;min-height:44px;font-size:13px}
  .result-grid{gap:18px 13px}
  .result-grid b{font-size:26px}
  .result-grid small{font-size:12px}
  .session-end{padding:28px 18px}
  .session-end h2{font-size:24px}
  .session-end p{font-size:14px}
}

@media(max-width:359px){
  .topbar{padding:9px 12px;gap:8px}
  .brand-name{font-size:14px}
  .account-button{padding:8px;font-size:11px}
  .body-content{padding-left:12px;padding-right:12px}
  .module-switch>button{font-size:13px;padding:10px 5px}
  .module-switch>button .ic{display:none}
  .learning-summary{gap:6px}
  .learning-summary>div,.learning-summary>.summary-item{padding:12px 8px}
  .learning-summary strong,.learning-summary b{font-size:25px}
  .learning-summary small,.learning-summary span{font-size:11px}
  .bottom-nav{padding-left:4px;padding-right:4px;gap:1px}
  .bottom-nav-button{font-size:10px}
  .study-actions>.btn{font-size:13px;padding:12px 7px}
  .study-actions>.btn .ic{display:none}
  .practice-card{padding:18px 15px}
  .practice-title{font-size:21px}
}

@media(prefers-reduced-motion:reduce){
  *,*::before,*::after{animation:none!important;transition:none!important;scroll-behavior:auto!important}
}
@media print{
  .bottom-nav,.study-actions,.account-button,.save-notice{display:none!important}
  .main{padding-bottom:0}
}

/* Compact feedback and completion layout for short mobile learning rounds. */
.session-header .plain-link{display:inline-flex;align-items:center;gap:6px}
.session-header .plain-link>.ic{transform:rotate(180deg)}
.save-notice>span{flex:1;min-width:0}
.save-notice>.ic{flex:none;align-self:flex-start;margin-top:2px}
.result-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px}
.result-grid small{display:block;overflow-wrap:anywhere}
@media(max-width:700px){.result-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}}

/* Three distinct self-assessments, with equal touch targets on small screens. */
.btn-review{background:#eaf2ff;border:1px solid #a3c0ed;color:#254f88}
.btn-review:hover{background:#dceaff;border-color:#7ca4df}
.status.review{background:#eaf2ff;color:#254f88}
.study-actions.is-grading{display:grid;grid-template-columns:repeat(3,minmax(0,1fr))}
.study-actions.is-grading>.btn{min-width:0;min-height:72px;white-space:normal;padding:12px 8px;gap:8px}
.grade-copy{display:flex;flex-direction:column;gap:4px;min-width:0}
.grade-copy strong{font-size:inherit;font-weight:750;line-height:1.2}
.study-actions .grade-copy small{font-size:12px;line-height:1.25;font-weight:500}
.result-grid .result-total{grid-column:1/-1}
@media(max-width:700px){
 .study-actions.is-grading>.btn{padding:10px 5px;min-height:76px;gap:0}
 .study-actions.is-grading .ic{display:none}
 .study-actions .grade-copy small{font-size:11px}
}

/* Secondary card actions stay separate from the large rating targets. */
.undo-review{margin:0 0 16px;min-height:48px;max-width:100%}
.repeat-note{color:var(--sub);font-size:13px;line-height:1.6;margin:22px 0 8px}
.delete-card-link{display:inline-flex;align-items:center;gap:8px;min-height:48px;color:#8a3e36;padding:10px 4px}
.sheet-entry h2{font-size:19px;margin:0 0 7px}
.sheet-overview{padding:18px;margin:16px 0}
.sheet-toolbar{display:flex;align-items:center;gap:8px;flex-wrap:wrap}
.sheet-toolbar>strong{flex:1;min-width:130px;font-size:15px}
.sheet-toolbar>.btn{min-height:48px;flex:none}
.sheet-toolbar>.btn-muted{min-width:48px;padding:10px}
.sheet-overview p{color:var(--sub);font-size:14px;line-height:1.6;margin:12px 0 0}
.sheet-overview .card-meta-details{margin-top:6px}
.study-sheet-card{padding:25px;margin:18px 0;overflow-wrap:anywhere}
.study-sheet-card h2{font-size:20px;line-height:1.5;letter-spacing:-.3px;margin:18px 0 15px}
.sheet-answer{font-size:16px;line-height:1.75;color:#234a3f;background:#f1fcf7;border:1px solid #cceee5;border-radius:11px;padding:18px}
.sheet-counts{font-size:13px;color:var(--sub);line-height:1.6;margin:16px 0 6px}
.sheet-personal-note{margin-top:14px;padding:14px;border-left:3px solid #a3c0ed;background:#f3f7ff;border-radius:8px}
.sheet-personal-note p{margin:6px 0 0;line-height:1.65}
.personal-editor .answer-details>summary .ic{display:inline-block;vertical-align:middle;margin-right:5px}
.study-sheet-card>.text-muted{font-size:13px;line-height:1.6}
@media(max-width:700px){
 .undo-review{font-size:13px;padding:10px 12px}
 .sheet-toolbar>strong{flex-basis:100%}
 .sheet-toolbar>.btn-outline{flex:1}
 .study-sheet-card{padding:18px 15px;margin:14px 0}
 .study-sheet-card h2{font-size:19px;line-height:1.5}
 .sheet-answer{padding:14px;line-height:1.65}
}
@media print{
 .undo-review,.delete-card-link{display:none!important}
 .study-sheet-card{box-shadow:none}
 .sheet-answer{background:white;color:black}
}

/* Personal learning tools: generous touch targets without expanding the main navigation. */
.learn-mode-tabs{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:5px;padding:5px;margin:18px 0;background:#eaf0f8;border:1px solid #dce4ef;border-radius:13px}
.learn-mode-tabs>button{display:flex;align-items:center;justify-content:center;gap:7px;min-width:0;min-height:48px;padding:10px 8px;border:1px solid transparent;border-radius:9px;background:transparent;color:#455872;font-weight:700;font-size:14px;line-height:1.3;overflow-wrap:anywhere}
.learn-mode-tabs>button.is-active,.learn-mode-tabs>button[aria-pressed="true"],.learn-mode-tabs>button[aria-selected="true"]{background:#fff;border-color:#c7d5e8;color:#204c9b;box-shadow:0 1px 4px #1f3e6510}
.learn-mode-tabs>button:focus-visible{outline:3px solid #2457c6;outline-offset:1px}
.personal-card-tools{display:flex;align-items:center;gap:8px;flex-wrap:wrap;margin:14px 0 8px}
.favorite-toggle,.hint-toggle{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-width:48px;min-height:48px;max-width:100%;padding:10px 13px;border:1px solid #d3ddeb;border-radius:10px;background:#fff;color:#405571;font-size:14px;font-weight:650;line-height:1.4;overflow-wrap:anywhere}
.favorite-toggle>.ic,.hint-toggle>.ic{flex:none}
.favorite-toggle[aria-pressed="true"]{background:#fff5dd;border-color:#d8b86c;color:#785312}
.favorite-toggle[aria-pressed="true"]>.ic{fill:#ffdf7e}
.hint-toggle[aria-expanded="true"]{background:#fff8e8;border-color:#d8bf80;color:#70551b}
.hint-panel{padding:15px 17px;margin:12px 0 18px;background:#fff9e9;border:1px solid #e6d39b;border-radius:11px;color:#574722;font-size:15px;line-height:1.7;overflow-wrap:anywhere}
.hint-panel h2,.hint-panel h3{font-size:15px;line-height:1.4;margin:0 0 7px;color:#614b13}
.hint-panel p{margin:0;white-space:pre-wrap}
.personal-editor{min-width:0;margin-top:23px;padding-top:21px;border-top:1px solid #dce5ef}
.personal-editor h2{font-size:18px;line-height:1.4;margin:0 0 13px}
.personal-editor h3{font-size:15px;line-height:1.4;margin:18px 0 10px}
.personal-editor label{display:block;margin:14px 0 7px;font-size:14px;font-weight:700;color:#354965}
.personal-editor textarea.field{display:block;width:100%;max-width:100%;min-width:0;height:auto;min-height:110px;padding:12px;resize:vertical;font-size:16px;line-height:1.6}
.personal-editor #personal-hint{min-height:88px}
.personal-editor p{font-size:13px;line-height:1.6;color:var(--sub)}
.personal-save-row{display:flex;align-items:center;flex-wrap:wrap;gap:10px 14px;margin:13px 0}
.personal-save-row>.btn,.personal-save-row>button{min-height:48px}
.personal-save-row>span,.personal-save-row>p,.personal-save-row>[role="status"]{min-width:0;flex:1;font-size:13px;line-height:1.5;overflow-wrap:anywhere}
.personal-save-row>p{margin:0}
.understanding-options{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:8px;margin:12px 0}
.understanding-details{margin-top:20px;border:1px solid var(--line);border-radius:10px;padding:0 12px;background:#f8fafc}
.understanding-details>summary{padding:13px 0;min-height:52px;cursor:pointer;font-size:14px;font-weight:650;color:#43526a}
.understanding-details>summary span{display:inline-block;vertical-align:middle;max-width:90%}
.understanding-details>summary small{display:block;font-size:12px;font-weight:400;color:var(--sub);margin-top:3px}
.understanding-details .understanding-help{font-size:13px;line-height:1.6}
.recall-heading{margin-top:24px;padding-top:20px;border-top:2px solid var(--line)}
.recall-heading h2{font-size:18px;margin:0 0 7px}
.recall-heading p{font-size:14px;margin:0;color:#43526a;line-height:1.5}
.understanding-options>button{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:5px;min-width:0;min-height:72px;padding:10px 7px;border:1px solid #cbd7e7;border-radius:10px;background:#fff;color:#3c536f;font-size:14px;font-weight:700;line-height:1.35;text-align:center;overflow-wrap:anywhere}
.understanding-options>button[aria-pressed="true"]{border:2px solid #3766b8;padding:9px 6px;background:#edf3ff;color:#214f99}
.understanding-options>button small,.understanding-options>button>span{font-size:12px;font-weight:500;line-height:1.35}
.understanding-options>button:disabled{opacity:.5;cursor:not-allowed}
.understanding-help{font-size:13px;line-height:1.6;color:var(--sub);margin:9px 0 14px}
.favorite-round-summary{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px;margin:16px 0}
.favorite-round-summary>div{min-width:0;padding:14px;border:1px solid #dce5ef;background:#fff;border-radius:11px;text-align:center}
.favorite-round-summary strong,.favorite-round-summary b{display:block;font-size:25px;line-height:1.25}
.favorite-round-summary span,.favorite-round-summary small{display:block;font-size:13px;color:var(--sub);margin-top:4px}
.favorite-badge{display:inline-flex;align-items:center;gap:5px;max-width:100%;padding:5px 9px;border-radius:7px;background:#fff5dd;color:#785312;font-size:12px;font-weight:700;line-height:1.4;overflow-wrap:anywhere}
.favorite-badge>.ic{flex:none}
.reading-controls{display:grid;grid-template-columns:repeat(2,minmax(0,1fr))}
.reading-controls>.btn{min-width:0;min-height:52px;white-space:normal}
@media(max-width:700px){
 .learn-mode-tabs{gap:3px;padding:4px;margin:15px 0}
 .learn-mode-tabs>button{font-size:13px;padding:10px 5px}
 .learn-mode-tabs>button>.ic{display:none}
 .personal-card-tools{margin-top:13px}
 .favorite-toggle{flex:1;font-size:13px;padding:10px}
 .hint-toggle{font-size:13px;padding:10px}
 .hint-panel{padding:14px;font-size:15px}
 .personal-editor{margin-top:20px;padding-top:18px}
 .personal-save-row{align-items:flex-start}
 .personal-save-row>span,.personal-save-row>p,.personal-save-row>[role="status"]{flex-basis:100%}
 .understanding-options{gap:6px}
 .understanding-options>button{font-size:13px;min-height:76px;padding:9px 4px}
 .understanding-options>button[aria-pressed="true"]{padding:8px 3px}
 .understanding-options>button small,.understanding-options>button>span{font-size:11px}
 .practice-layout:has(.personal-editor textarea:focus) .study-actions{position:static}
}
@media print{
 .learn-mode-tabs,.personal-card-tools,.personal-save-row,.understanding-options,.reading-controls{display:none!important}
 .hint-panel{background:white;color:black}
}

.edit-answer-button{margin:4px 0 14px;min-height:44px;white-space:normal}
.solution .new-study-card-button{margin:4px 0 14px;min-height:44px;white-space:normal}
.solution>.edit-answer-button{margin-right:8px}
@media(max-width:480px){.solution>.edit-answer-button,.solution>.new-study-card-button{width:100%;margin-right:0}}
.answer-editor-question{font-weight:600;line-height:1.5}
.topbar-actions{display:flex;align-items:center;gap:8px;min-width:0}
.topbar-actions .account-button{max-width:150px;min-width:0}
.topbar-actions .account-button span{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.question-search-button{flex:none}
#catalog-search::-webkit-search-cancel-button{display:none}
.quick-question-search{margin:18px 0 20px}
.quick-question-search>label{display:block;margin-bottom:7px;font-size:14px;font-weight:700;color:var(--ink)}
.quick-question-search>div{display:flex;gap:8px;align-items:stretch}
.quick-question-search .field{flex:1;width:0;min-width:0;height:auto}
.quick-question-search .btn{flex:none}
.live-study-counts{display:flex;flex-wrap:wrap;gap:7px 17px;margin:12px 0 15px;padding:12px 14px;border:1px solid var(--line);border-radius:11px;background:#fff;font-size:13px;color:var(--sub);line-height:1.5}
.live-study-counts strong{color:var(--ink)}
.learning-summary>.summary-item{font:inherit;text-align:left;color:var(--ink);cursor:pointer}
.learning-summary>.summary-item>span{display:flex;align-items:center;justify-content:space-between;gap:3px;width:100%}
.learning-summary>.summary-item>span>.ic{flex:none;color:#7b8fa9}
.learning-summary>.summary-item:hover:not(:disabled){border-color:#9fb8dc;background:#fafdff}
.learning-summary>.summary-item:disabled{cursor:default;opacity:.55}
@media(max-width:360px){.topbar-actions{gap:4px}.topbar-actions .account-button{max-width:80px}.quick-question-search .btn{padding:10px;font-size:13px}}
.answer-review-badge{display:inline-flex;align-items:center;gap:6px;max-width:100%;margin:0 0 10px;padding:6px 10px;border-radius:8px;background:#fff1df;color:#8b410c;font-size:13px;font-weight:750;line-height:1.45;overflow-wrap:anywhere}
.answer-review-badge>.ic,.answer-review-toggle>.ic{flex:none;color:#c95b0a;fill:#f9a23b}
.answer-review-setting{margin:18px 0}
.answer-review-toggle{display:flex;align-items:center;gap:9px;width:100%;min-height:48px;padding:11px 13px;border:1px solid #dda56d;border-radius:10px;background:#fff;color:#813a0b;font:inherit;font-size:15px;font-weight:700;text-align:left;cursor:pointer}
.answer-review-toggle[aria-pressed="true"]{border:2px solid #b5500b;padding:10px 12px;background:#fff1df}
.answer-review-state{margin-left:auto;font-size:12px;font-weight:600}
.answer-review-setting>p{margin:8px 0 0;font-size:13px;line-height:1.5}
@media(max-width:360px){.answer-review-toggle{flex-wrap:wrap;gap:7px}.answer-review-state{margin-left:30px;flex-basis:100%}}
.answer-editor #q-answer{min-height:240px;line-height:1.6;resize:vertical}
.answer-editor .form-actions{gap:10px}

.choice-invitation{display:grid;gap:9px;margin:20px 0;padding:15px;background:var(--brand-soft);border:1px solid var(--line);border-radius:13px}
.choice-invitation p,.choice-invitation small{margin:0}.choice-invitation small,.choice-source{color:var(--sub);font-size:13px;line-height:1.5}
.choice-help{margin:22px 0;padding-top:16px;border-top:1px solid var(--line)}.choice-help h2{font-size:20px;line-height:1.3}
.choice-options{display:grid;gap:10px;margin:15px 0}.choice-option{display:flex;align-items:flex-start;gap:10px;padding:14px;min-height:54px;width:100%;min-width:0;white-space:normal;text-align:left;font-size:16px;line-height:1.5;font-weight:500;color:var(--ink);overflow-wrap:anywhere}
.choice-option>span:last-child{min-width:0}
.choice-option>span:first-child{font-weight:800;color:var(--sub);flex-shrink:0}.choice-option small{display:block;font-size:13px;font-weight:700;margin-top:5px}.choice-option:disabled{opacity:1;cursor:default}
.choice-option.is-correct{background:var(--good-bg);border-color:var(--good)}.choice-option.is-wrong{background:var(--hard-bg);border-color:var(--hard)}
.choice-feedback{padding:14px;border:1px solid var(--line);border-radius:12px;background:var(--bg)}.choice-feedback h3{font-size:16px;margin:0 0 8px}.choice-feedback p{line-height:1.6}.choice-feedback summary{cursor:pointer;font-weight:650;min-height:44px;padding-top:10px}
.choice-unavailable{font-size:13px;margin-top:16px}.assistance-summary{margin:18px 0}.assistance-summary h2{font-size:19px}
.study-actions.has-assistance{grid-template-columns:1fr}.study-actions.has-assistance>button{width:100%}

.study-backlinks{display:flex;flex-wrap:wrap;align-items:center;gap:10px;margin:14px 0 18px}.study-backlinks>.btn{min-height:44px;white-space:normal}.study-backlinks>.warning{flex-basis:100%;margin:0}.study-backlinks .undo-review{margin:0}
.previous-card-heading{margin-bottom:20px}.previous-card-heading p{color:var(--sub);line-height:1.6}.previous-card-button .ic{transform:rotate(180deg)}
.previous-card-return{position:sticky;bottom:calc(78px + env(safe-area-inset-bottom,0px));z-index:20;display:flex;justify-content:center;margin-top:18px;padding:10px;border:1px solid var(--line);border-radius:14px;background:var(--surface)}.previous-card-return>.btn{width:100%;min-height:48px;white-space:normal}
@media(min-width:701px){.previous-card-return{bottom:16px}}

.edit-question-button{min-height:44px;white-space:normal;margin:0 0 12px}
.question-editor #q-question{min-height:150px;line-height:1.6;resize:vertical;font-size:16px}.question-editor .form-actions{gap:10px}

/* Only these fixed presentation tokens can be stored in a card. */
.fmt-bold{font-weight:900}.fmt-italic{font-style:italic}.fmt-underline{text-decoration:underline;text-underline-offset:.15em}
.fmt-size-small{font-size:.875em}.fmt-size-large{font-size:1.15em}.fmt-size-xlarge{font-size:1.3em}
.fmt-color-blue{color:#1e40af}.fmt-color-green{color:#14532d}.fmt-color-red{color:#991b1b}.fmt-color-purple{color:#6b21a8}.fmt-color-gray{color:#374151}
.fmt-highlight-yellow{background-color:#fff1ae}.fmt-highlight-green{background-color:#dcf2d9}.fmt-highlight-blue{background-color:#dfedff}.fmt-highlight-pink{background-color:#fbe0ec}.fmt-highlight-purple{background-color:#ece3fa}
[class*="fmt-highlight-"]{border-radius:2px;box-decoration-break:clone;-webkit-box-decoration-break:clone}
.fmt-line{display:block;white-space:pre-wrap;overflow-wrap:anywhere}
.fmt-indent-1{margin-inline-start:1.5em}.fmt-indent-2{margin-inline-start:3em}.fmt-indent-3{margin-inline-start:4.5em}.fmt-indent-4{margin-inline-start:6em}.fmt-indent-5{margin-inline-start:7.5em}.fmt-indent-6{margin-inline-start:9em}
.rich-editor>.fmt-line{min-height:1.7em}
.editor-key-hint{font-weight:400}
@media(max-width:700px){.editor-key-hint{display:none}}
.rich-editor-shell{min-width:0;border:1px solid #d6dfe9;border-radius:10px;background:#fff;overflow:visible}
.rich-editor-shell:focus-within{border-color:#8daacb;box-shadow:0 0 0 2px #e9f0f8}
.format-toolbar{position:sticky;top:0;z-index:2;display:flex;align-items:center;flex-wrap:wrap;gap:2px;margin:0;padding:4px 6px;min-width:0;border-bottom:1px solid #e9edf3;border-radius:10px 10px 0 0;background:#fafbfd;color:#64748b}
.format-tool,.format-menu{display:inline-flex;align-items:center;justify-content:center;position:relative;flex:none;gap:3px;width:36px;min-width:36px;height:40px;min-height:40px;margin:0!important;padding:0!important;border:0;border-radius:6px;background:transparent;color:#65748a;font-weight:400;cursor:pointer}
.format-menu{width:43px;min-width:43px}
.format-tool:hover,.format-menu:hover{background:#edf1f6;color:#314862}
.format-toggle[aria-pressed="true"]{background:#e9eff8;color:#345c8e}
.format-tool>svg,.format-menu>svg{flex:none;pointer-events:none}
.format-menu .format-select{position:absolute;inset:0;width:100%;height:100%;min-height:0;margin:0;padding:0;border:0;opacity:0;font-size:16px;cursor:pointer}
.format-menu:focus-within{outline:2px solid #8daacb;outline-offset:1px}
.format-divider{width:1px;height:17px;margin:0 3px;background:#dfe5ec;flex:none}
.format-indent-tools{display:inline-flex;flex:none;gap:inherit}
.rich-editor{width:100%;min-width:0;min-height:150px;max-height:55vh;padding:12px 14px;border:0;outline:none;font-size:16px;line-height:1.7;white-space:pre-wrap;overflow-wrap:anywhere;overflow-y:auto;text-align:left;font-weight:400;cursor:text}
.rich-editor:focus-visible{outline:none}
.rich-editor[aria-disabled="true"]{background:#f8fafc;cursor:wait}
.format-instruction{font-size:12px;font-weight:400;color:#7b8797;line-height:1.4;margin:6px 0 0}
@media(max-width:360px){.format-toolbar{padding:3px 4px;gap:1px}.format-tool{width:32px;min-width:32px}.format-menu{width:37px;min-width:37px}.format-divider{margin:0 2px}}


.last-shown{margin:12px 0 4px;color:var(--sub);font-size:12px;line-height:1.5}.last-shown .plain-link{font-size:inherit;padding:3px}
.previous-card-button{display:inline-flex;align-items:center;flex-wrap:wrap;gap:7px}.previous-card-button small{font-size:12px;color:var(--sub);font-weight:500}
.history-navigation{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px}.history-navigation>.btn{min-width:0;min-height:48px;font-size:13px;padding:10px 7px}.history-navigation>.history-return{grid-column:1/-1}
.study-actions .skip-action{grid-column:1/-1;min-height:44px;font-size:13px;padding:9px;color:var(--sub);background:var(--surface)}
#history-question{margin-top:7px;width:100%;min-width:0;font-size:16px}

.saved-answer-notice{display:flex;flex-wrap:wrap;align-items:center;gap:10px;padding:12px;margin-bottom:14px;border:1px solid var(--line);border-radius:10px;background:var(--bg);font-size:13px;color:var(--sub)}.saved-answer-notice .btn{min-height:44px;font-size:13px;white-space:normal}

/* Personal answer checks and an accessible, dependency-free activity chart. */
.learn-mode-tabs{grid-template-columns:repeat(4,minmax(0,1fr))}
.learn-mode-tabs>button[data-page="answer-review"]>.ic{display:block;color:#bd6a12}
.review-tab-count{min-width:20px;padding:2px 5px;border-radius:6px;background:#fff0d9;color:#995508;font-size:11px;font-weight:750}
.review-card-list{display:grid;gap:15px}
.review-card{padding:22px;min-width:0;border-top:3px solid #efb867}
.review-card h2{font-size:19px;line-height:1.45;margin:14px 0;overflow-wrap:anywhere}
.review-chapter{display:block;margin-top:9px;font-size:12px;color:var(--sub)}
.review-answer{white-space:pre-wrap;overflow-wrap:anywhere;font-size:16px;line-height:1.7}
.review-card .card-meta-details{margin:16px 0}
.activity-chart{position:relative;isolation:isolate;overflow:hidden;border:1px solid #2d4269;border-radius:22px;padding:27px;margin:20px 0;background:radial-gradient(ellipse at 92% 0,#34417f80,transparent 60%),linear-gradient(145deg,#172b4e,#12223d 80%);color:#f1f5ff;box-shadow:0 16px 35px #172e5218}
.activity-chart-top{display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap}
.activity-eyebrow{font-size:10px;letter-spacing:1.8px;font-weight:700;color:#aabdf3}
.activity-chart h2{color:#f4f7ff;margin:6px 0 0;font-size:25px;letter-spacing:-.7px;line-height:1.25}
.activity-period{display:inline-flex;gap:3px;padding:4px;background:#ffffff09;border:1px solid #ffffff1a;border-radius:10px}
.activity-period>button{border:0;border-radius:7px;background:transparent;color:#c4d1e8;font-size:12px;padding:9px 11px;min-height:40px;font-weight:650}
.activity-period>button[aria-pressed="true"]{background:#dae6ff;color:#18325c;box-shadow:0 2px 10px #00000015}
.activity-kpis{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px;margin:26px 0 23px}
.activity-kpis strong{display:block;font-size:33px;font-weight:750;letter-spacing:-1.2px;line-height:1.2;animation:activity-arrive .55s ease-out both}
.activity-kpis>div:nth-child(2) strong{color:#79e3ca;animation-delay:.1s}
.activity-kpis>div:nth-child(3) strong{color:#c4bcff;animation-delay:.2s}
.activity-kpis span{display:block;font-size:12px;line-height:1.4;color:#bbcae1;margin-top:5px}
.activity-legend{display:flex;gap:17px;flex-wrap:wrap;font-size:11px;color:#cfdaee;margin-bottom:14px}
.activity-legend>span{display:inline-flex;align-items:center;gap:7px}
.activity-legend i{display:inline-block;width:14px;height:3px;border-radius:2px;background:#9cb5ff;box-shadow:0 0 8px #819dff65}
.activity-legend .is-safe i{background:#79e3ca;box-shadow:0 0 8px #79e3ca45}
.activity-plot{position:relative;padding-left:32px;min-width:0}
.activity-y-axis{position:absolute;top:13px;bottom:15px;left:0;display:flex;flex-direction:column;justify-content:space-between;color:#adbed8;font-size:11px}
.activity-svg{display:block;overflow:visible;width:100%;height:215px}
.activity-grid-line{stroke:#c2d4ee22;stroke-width:1;stroke-dasharray:3 6;vector-effect:non-scaling-stroke}
.activity-line{fill:none;stroke-linejoin:round;stroke-linecap:round;vector-effect:non-scaling-stroke;stroke-dasharray:1;stroke-dashoffset:0;animation:activity-draw 1.1s cubic-bezier(.22,.65,.3,1) both}
.activity-total-line{stroke:#9cb5ff;stroke-width:3;filter:drop-shadow(0 0 4px #839cff55)}
.activity-safe-line{stroke:#79e3ca;stroke-width:2;animation-delay:.12s}
.activity-area{opacity:1;animation:activity-fade 1.2s ease-out both}
.activity-marker{stroke:#d4e0f855;stroke-width:1;stroke-dasharray:3 5;vector-effect:non-scaling-stroke}
.activity-dot{fill:#c4d2ff;stroke:#172b4e;stroke-width:2;vector-effect:non-scaling-stroke;filter:drop-shadow(0 0 5px #9cb5ffb0);animation:activity-glow 1.4s ease-in-out 3}
.activity-dot.is-safe{fill:#79e3ca;filter:drop-shadow(0 0 4px #79e3ca80);animation-delay:.2s}
.activity-x-axis{display:flex;justify-content:space-between;padding-left:43px;padding-right:4px;font-size:11px;color:#adbed8}
.activity-slider-label{display:block;font-size:12px;color:#cfdaee;margin:22px 0 4px}
.activity-day-selector{display:flex;align-items:center;gap:12px}
.activity-day-selector>button{display:inline-flex;align-items:center;justify-content:center;flex:none;width:44px;height:44px;padding:0;border:1px solid #ffffff22;border-radius:10px;background:#ffffff08;color:#d5e2fb}
.activity-day-selector>button[data-step="-1"]>.ic{transform:rotate(180deg)}
.activity-day-selector>button:disabled{opacity:.3}
.activity-day-selector input{flex:1;min-width:0;width:100%;height:44px;accent-color:#a8baff;cursor:pointer}
.activity-chart :is(button,input):focus-visible{outline:3px solid #b5d9ff;outline-offset:3px}
.activity-day-detail{padding:15px 17px;margin-top:10px;border:1px solid #ffffff1a;border-radius:13px;background:#ffffff06;min-width:0}
.activity-day-heading{display:flex;justify-content:space-between;gap:10px;flex-wrap:wrap;align-items:center;font-size:13px}
.activity-day-heading strong{color:#f0f5ff}
.activity-day-heading>span{font-size:11px;color:#bacbe3}
.activity-day-counts{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:8px;margin-top:16px}
.activity-day-counts b{display:block;font-size:20px;font-weight:700}
.activity-day-counts>div:first-child b{color:#ffc489}
.activity-day-counts>div:nth-child(2) b{color:#d5c2ff}
.activity-day-counts>div:last-child b{color:#79e3ca}
.activity-day-counts span{display:block;font-size:11px;line-height:1.5;color:#c0cfe4;margin-top:3px}
.activity-help-count{font-size:11px;line-height:1.5;color:#c0cfe4;margin:16px 0 0;padding-top:12px;border-top:1px solid #ffffff12}
.activity-footnote{font-size:11px;line-height:1.6;color:#aebfd9;margin:16px 0 0}
.activity-empty{font-size:12px;line-height:1.5;color:#cfdaee;margin:15px 0}
@keyframes activity-draw{from{stroke-dashoffset:1}to{stroke-dashoffset:0}}
@keyframes activity-arrive{from{opacity:0;transform:translateY(7px)}to{opacity:1;transform:translateY(0)}}
@keyframes activity-fade{from{opacity:0}to{opacity:1}}
@keyframes activity-glow{0%,100%{stroke-opacity:.9}50%{stroke-opacity:.25}}
@media(max-width:700px){.learn-mode-tabs{grid-template-columns:repeat(2,minmax(0,1fr))}.activity-chart{padding:20px 17px;border-radius:17px}.activity-chart h2{font-size:24px}.activity-kpis{gap:8px}.activity-kpis strong{font-size:29px}.activity-svg{height:175px}.activity-y-axis{top:10px;bottom:12px}.activity-day-detail{padding:13px 11px}.review-card{padding:18px}}
@media print{.activity-period,.activity-day-selector,.activity-slider-label{display:none}.activity-chart{break-inside:avoid}}