:root{font-family:Inter,"Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;color:#263142;background:#f7f8fa;font-synthesis:none;--line:#e8ebef;--muted:#808a9a;--blue:#3767d9;--ink:#263142;--soft:#f0f4fd;--bg:#f7f8fa}*{box-sizing:border-box}html,body,#app{height:100%;margin:0}body{overflow:hidden}button,input,textarea,select{font:inherit}button{cursor:pointer}button:disabled{opacity:.42;cursor:not-allowed}a{color:inherit;text-decoration:none}.app{height:100%;min-height:0;display:flex;flex-direction:column}.shell{max-width:960px;margin:0 auto;padding:0 24px;width:100%}.topbar{flex:none;height:64px;background:rgba(255,255,255,.96);border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;padding:0 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small{color:var(--muted);font-size:12px}.actions{display:flex;flex-wrap:wrap;gap:8px;margin-top:22px}.pill{padding:8px 12px;border:1px solid var(--line);border-radius:999px;background:#fff;font-size:12px;font-weight:650;color:#566476}.pill.active{background:#edf3ff;color:#2459b4;border-color:#bdcff3}.quiz{min-height:0;flex:1;display:flex;flex-direction:column;background:#f7f8fa}.quiz-top{flex:none;display:flex;align-items:center;gap:12px;padding:14px clamp(15px,4vw,38px) 10px;max-width:100%;background:#fff;border-bottom:1px solid var(--line)}.quiz-title{font-size:13px;font-weight:650;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;flex:1}.quiz-number{font-size:12px;color:#7e8a9a;white-space:nowrap;font-variant-numeric:tabular-nums}.progressbar{height:3px;background:#e9eef8;flex:none}.progressbar span{display:block;height:100%;background:var(--blue);transition:width 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@media(max-width:700px){.topbar{height:55px;padding:0 14px}.brand small{display:none}.brand{gap:8px}.email{max-width:114px}.topbar .btn{padding:7px 9px;font-size:12px}.home-wrap{padding:38px 18px 70px}.home-title{font-size:32px}.section-head{margin-top:31px}.bank-card{padding:18px 14px;gap:11px}.bank-initial{width:41px;height:41px}.library-page{padding:17px 16px 50px}.page-title{font-size:24px}.quiz-top{padding:10px 13px;gap:8px}.quiz-center{display:block}.question-card{padding:17px 15px 24px}.question-kind{margin-bottom:12px}.question-text{font-size:17px;line-height:1.67}.options{gap:8px;margin-top:15px}.opt{min-height:44px;padding:11px 12px;font-size:14px;gap:10px}.opt strong{min-width:23px;height:23px}.quiz-footer{min-height:65px;padding:8px 10px max(8px,env(safe-area-inset-bottom));gap:7px}.quiz-footer .btn{min-height:43px;padding:9px 8px}.quiz-footer .prev{width:66px}.quiz-footer .fav{width:42px;min-width:42px}.answer-box{padding:12px;font-size:13px;margin-top:13px}.auth-card{padding:24px;border-radius:17px}.admin-layout{grid-template-columns:1fr;display:flex;flex-direction:column}.admin-nav{flex:none;display:flex;align-items:center;gap:7px;padding:7px 10px;border-bottom:1px solid var(--line);border-right:0;overflow:auto}.admin-nav h2{display:none}.admin-nav button{width:auto;flex:none;white-space:nowrap;margin:0;padding:9px 11px}.admin-content{padding:20px 13px}.edit-grid,.two-column{grid-template-columns:1fr}.edit-grid .wide{grid-column:auto}.panel{padding:14px}.searchbar{flex-direction:column}.result-row{flex-wrap:wrap}}
/* Modern mobile browser viewport, including address bar and virtual keyboard. */
@supports (height:100dvh){html,body,#app,.app{height:100dvh}}
.quiz-center{touch-action:pan-y;overscroll-behavior-y:contain}
/* English Lab V3 - polished personalized learning dashboard */
:root{--blue:#315bb7;--ink:#203049;--line:#e4eaf2;--bg:#f6f8fc;--muted:#76859a}body{background:var(--bg)}.topbar{box-shadow:0 1px 3px #24456d08}.brand-mark{background:#243d64}.btn{border-radius:12px}.v3-scroll{background:#f6f8fc}.dashboard{max-width:1150px;margin:auto;padding:34px 26px 66px}.dash-hero{position:relative;overflow:hidden;padding:38px 42px 36px;border-radius:24px;background:linear-gradient(115deg,#223c67,#355e9e 62%,#527dba);color:#fff;box-shadow:0 12px 24px #244a7d22}.dash-hero .eyebrow{color:#bbd3ff}.dash-hero h1{font-size:clamp(27px,4.3vw,40px);letter-spacing:-.04em;line-height:1.28;margin:12px 0}.dash-hero p{font-size:15px;color:#e0eafe;margin:0}.hero-accent{position:absolute;right:45px;top:5px;color:#ffffff22;font-size:160px;transform:rotate(17deg);pointer-events:none}.metrics{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px;margin:18px 0 14px}.metric{background:white;border:1px solid #e8eef5;border-radius:18px;padding:19px 23px;box-shadow:0 3px 12px #13376006}.metric>span{color:#6f829c;font-size:13px;font-weight:650}.metric strong{display:block;margin:10px 0 5px;font-size:32px;font-variant-numeric:tabular-nums;line-height:1.1;letter-spacing:-.05em;color:#243d64}.metric strong small{font-size:13px;margin-left:6px;color:#8897a9}.metric>div{font-size:12px;color:#95a1b1}.dash-grid{display:grid;grid-template-columns:minmax(0,1.65fr) minmax(250px,.9fr);gap:22px;align-items:start;margin-top:12px}.dash-grid .section-head{margin:19px 0 15px}.card-v3{border-radius:17px;padding:20px;box-shadow:0 3px 14px #1337600b}.card-v3:hover{transform:translateY(-3px);box-shadow:0 12px 26px #173d7030}.bank-initial.theme-0{background:#e8f0ff;color:#2d5eb8}.bank-initial.theme-1{background:#f2eafd;color:#7645bd}.bank-initial.theme-2{background:#e8f8f3;color:#218d76}.bank-initial.theme-3{background:#fff2e8;color:#bd732b}.bank-go{font-size:18px;color:#86a0c3}.activity-card{background:#fff;border:1px solid #e8eef5;border-radius:18px;padding:8px 22px 20px;box-shadow:0 3px 14px #1337600b}.activity-chart{display:grid;grid-template-columns:repeat(7,1fr);align-items:end;gap:11px;height:220px;padding:20px 0 0}.day-col{display:flex;flex-direction:column;align-items:center;justify-content:end;min-width:0;height:100%;gap:7px}.day-track{height:140px;width:23px;border-radius:9px;background:#f0f3fa;overflow:hidden;display:flex;align-items:flex-end}.day-bar{width:100%;background:#a0b6e1;border-radius:9px;min-height:0}.day-bar.current{background:#416cc8}.day-label{font-size:12px;color:#8190a6}.day-val{font-size:11px;color:#718199;font-variant-numeric:tabular-nums}.activity-card .small-note{margin:17px 0 0}.v3-library{max-width:1070px;padding-top:22px}.library-banner{background:linear-gradient(118deg,#f0f5ff,#e7f0ff);border:1px solid #dce6f7;border-radius:19px;padding:26px 30px;margin-top:16px}.library-banner .eyebrow{color:#5175b5}.library-banner h1{margin:8px 0 7px}.library-banner p{font-size:13px;color:#6f7d92;margin:0}.library-meta{display:flex;gap:9px;flex-wrap:wrap;margin-top:19px}.library-meta span{border:1px solid #cbdcf6;background:#ffffffa1;padding:7px 12px;border-radius:9px;font-size:12px;color:#425e83}.quick-panel{background:white;border:1px solid #e6ebf3;border-radius:18px;padding:22px 23px;margin-top:19px}.quick-title{display:flex;justify-content:space-between;gap:20px;align-items:center}.quick-title h2{font-size:17px;margin:0}.quick-title>span{color:#8896a9;font-size:12px}.mode-cards{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin-top:18px}.mode-card{display:flex;flex-direction:column;align-items:flex-start;text-align:left;border:1px solid #e5eaf3;background:#fff;border-radius:13px;padding:17px 15px;gap:9px;min-width:0;transition:background .16s,border-color .16s}.mode-card:hover{background:#f8faff;border-color:#aebfe2}.mode-card strong{font-size:14px;color:#24324b}.mode-card small{font-size:11px;color:#8996a6;line-height:1.5}.mode-icon{width:37px;height:37px;border-radius:11px;display:grid;place-items:center;font-size:22px}.mode-icon.blue{background:#eaf0ff;color:#3665c4}.mode-icon.lilac{background:#f1eaff;color:#8255c8}.mode-icon.coral{background:#fff0ec;color:#d66e52}.mode-icon.mint{background:#e6f6f0;color:#268f7a}.type-overview{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin:16px 0}.kind-tile{display:flex;align-items:center;justify-content:space-between;background:#fff;border:1px solid #e8edf5;padding:14px 17px;border-radius:12px;font-size:12px;color:#738198}.kind-tile strong{font-size:16px;color:#293b5c}.v3-library>.section-head{margin:25px 2px 14px}.tree-root{border:1px solid #e4eaf3;background:white;border-radius:17px;padding:9px 12px 14px}.tree-item{border-bottom:1px solid #eef1f6}.tree-item:last-child{border-bottom:0}.tree-line{display:flex;align-items:center;gap:8px;min-width:0}.tree-expand{flex:1;min-width:0;display:flex;align-items:center;gap:10px;text-align:left;background:transparent;border:0;padding:13px 7px}.tree-caret{display:grid;place-items:center;width:26px;height:26px;border-radius:8px;background:#eff4fc;color:#446da9;font-size:21px;flex:none}.tree-leaf{display:grid;place-items:center;width:26px;color:#b4c3d8;flex:none}.tree-name{flex:1;min-width:0;overflow-wrap:anywhere;font-size:14px;color:#32445e}.tree-count{font-size:11px;color:#8998a9;white-space:nowrap}.tree-start{flex:none;border:1px solid #d1dff3;border-radius:9px;background:#eff5ff;color:#315eb0;padding:8px 11px;font-size:12px;font-weight:700}.tree-start:hover{background:#dceaff}.tree-children{margin-left:25px;border-left:1px dashed #d3dceb;padding-left:7px}.depth-0>.tree-line .tree-name{font-weight:750}.depth-1>.tree-line .tree-name{font-weight:650}.depth-3>.tree-line .tree-name{font-size:12.5px}.setup-wrap{width:min(100%,690px);margin:auto;padding:36px 24px 70px}.setup-card{background:white;border:1px solid #e6ecf4;border-radius:22px;padding:34px;box-shadow:0 10px 26px #23466c0a;margin-top:14px}.setup-card .eyebrow{color:#5375b4}.setup-card h1{font-size:30px;letter-spacing:-.045em;margin:11px 0 7px}.setup-mode{display:flex;justify-content:space-between;align-items:center;gap:10px;margin:26px 0 21px;padding:15px 17px;border-radius:12px;background:#edf4ff;color:#2c5498;font-weight:700}.setup-mode span{font-size:12px;color:#5c78a3}.setup-field{display:flex;flex-direction:column;gap:8px;font-size:13px;font-weight:700;margin:18px 0;color:#3b4d65}.setup-field select{border:1px solid #dbe4f1;background:white;border-radius:11px;padding:13px;color:#314058}.setting-row{display:flex;justify-content:space-between;align-items:center;gap:20px;border-top:1px solid #eaf0f6;padding:17px 0}.setting-row span{display:flex;flex-direction:column;gap:5px}.setting-row strong{font-size:14px;color:#34445c}.setting-row small{font-size:12px;color:#8a98aa;line-height:1.6}.setting-row input{accent-color:#416dcc;width:19px;height:19px;flex:none}.setup-footer{display:flex;gap:10px;justify-content:flex-end;margin-top:22px}.setup-footer .primary{min-width:175px}.quiz-v3{background:#f4f7fb}.quiz-v3 .quiz-top{background:#fff;padding-top:12px;padding-bottom:12px}.quiz-meta{display:flex;flex:1;min-width:0;flex-direction:column;gap:4px}.quiz-meta small{font-size:11px;color:#9aa6b7;overflow:hidden;white-space:nowrap;text-overflow:ellipsis}.quiz-number{color:#8593a7}.quiz-number strong{font-size:19px;color:#294a85}.quiz-v3 .progressbar{height:5px;background:#e9eef8}.quiz-v3 .progressbar span{background:linear-gradient(90deg,#4284de,#4f63c6)}.quiz-v3 .question-card{background:#fff;border:1px solid #e7ecf4;border-radius:19px;margin:18px auto;padding:24px 28px 30px;max-width:740px;align-self:flex-start;box-shadow:0 3px 14px #2948750a}.quiz-v3 .question-kind{display:flex;justify-content:space-between;margin-bottom:24px;letter-spacing:normal;font-size:12px;color:#8a9aac;text-transform:none}.kind-tag{padding:6px 12px;background:#eaf2ff;color:#3460a5;border-radius:7px;font-size:12px;font-weight:750}.quiz-v3 .question-text{font-size:19px;line-height:1.75}.quiz-v3 .opt{border-color:#e1e7f0;padding:16px;border-radius:12px}.quiz-v3 .opt:hover:not(:disabled){border-color:#91b0e7;background:#f6f9fe}.quiz-v3 .opt strong{background:#ecf1fa;color:#4e6386}.quiz-v3 .quiz-footer{box-shadow:0 -6px 24px #23436b0a}.answer-heading{font-weight:800}.session-done{width:min(100%,650px);margin:8vh auto;text-align:center;background:white;border:1px solid #e4eaf3;padding:40px 35px;border-radius:22px}.done-symbol{width:75px;height:75px;background:#e5f8f0;color:#2b957c;border-radius:50%;margin:0 auto 25px;display:grid;place-items:center;font-size:35px}.session-done h1{font-size:30px;margin:12px 0}.done-metrics{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin:32px 0}.done-metrics>div{background:#f5f8fc;border-radius:13px;padding:20px 9px;display:flex;flex-direction:column;gap:8px}.done-metrics strong{font-size:28px;color:#2c548f}.done-metrics span{font-size:12px;color:#8896a7}.done-actions{display:flex;justify-content:center;gap:10px}
@media(max-width:800px){.dashboard{padding:18px 15px 50px}.dash-hero{padding:26px 23px;border-radius:18px}.hero-accent{right:7px;top:15px;font-size:90px}.dash-hero h1{font-size:29px}.dash-hero p{font-size:13px}.dash-grid{grid-template-columns:1fr;gap:5px}.metrics{gap:8px}.metric{padding:14px 12px;border-radius:13px}.metric strong{font-size:25px}.metric>span{font-size:11px}.metric>div{font-size:10px}.activity-card{margin-top:12px}.mode-cards{grid-template-columns:repeat(2,1fr)}.quick-title{flex-direction:column;align-items:flex-start;gap:7px}.v3-library{padding:17px 14px 55px}.library-banner{padding:23px 19px}.quick-panel{padding:18px 14px}.type-overview{gap:7px}.kind-tile{padding:12px 9px;flex-direction:column;gap:7px;align-items:flex-start}.setup-wrap{padding:22px 13px 55px}.setup-card{padding:23px 18px}.tree-root{padding:5px 7px 12px}.tree-children{margin-left:12px;padding-left:5px}.tree-expand{gap:6px;padding:12px 2px}.tree-name{font-size:13px}.tree-start{padding:7px 8px}.quiz-v3 .question-card{margin:8px 8px 12px;padding:17px 16px 25px;border-radius:15px}.quiz-v3 .question-text{font-size:17px;line-height:1.6}.quiz-v3 .question-kind{margin-bottom:14px}.quiz-v3 .opt{padding:11px 12px}.quiz-v3 .quiz-footer{padding-left:8px;padding-right:8px}.session-done{margin:30px 13px;padding:26px 15px}}

@media(max-width:480px){.topbar .email{display:none}.topbar .user-menu{gap:5px}.topbar .btn{white-space:nowrap;padding:7px 9px;font-size:12px}.quiz-footer .btn{white-space:nowrap;font-size:12px}.quiz-footer .prev{width:72px}.quiz-footer .fav{width:41px;min-width:41px}.quiz-footer .primary{min-width:0}.quiz-v3 .question-card{max-width:calc(100% - 16px)}}


/* ====================== English Lab V3.2: focus experience ====================== */
:root{--blue:#315fcd;--ink:#172844;--muted:#718096;--bg:#f3f6fc;--line:#e1e7f1}
body{background:#f3f6fc}
.dashboard{padding-top:29px}
.dashboard-compact-head{display:flex;align-items:flex-end;justify-content:space-between;gap:20px;margin-bottom:22px}
.dashboard-compact-head h1{font-size:clamp(21px,3vw,28px);letter-spacing:-.04em;color:#142746;margin:5px 0 0;font-weight:780}
.dashboard-compact-head .eyebrow{color:#6684ac;font-size:10px}
.dashboard-compact-note{font-size:12px;color:#71809a;padding-bottom:5px}
.quiz-v4{background:radial-gradient(ellipse at 8% 4%,#e5edfb 0%,transparent 43%),radial-gradient(ellipse at 97% 80%,#e9ebfa 0%,transparent 40%),#f4f7fc}
.quiz-v4 .quiz-top{height:65px;padding:10px clamp(15px,3vw,36px);border-bottom:1px solid #e7edf7;background:#fff;gap:16px}
.quiz-v4 .quiz-top .icon-btn{border:1px solid #e3e8f2;border-radius:12px;width:39px;height:39px;transition:.18s;background:#f8fafc;font-size:19px}
.quiz-v4 .quiz-top .icon-btn:hover{background:#e9f0fd;color:#315fcd}
.quiz-v4 .quiz-meta{flex:1;min-width:0;display:flex;flex-direction:column;gap:3px}
.quiz-v4 .quiz-title{font-size:13px;color:#1f3351;font-weight:780}
.quiz-v4 .quiz-meta small{color:#96a2b8;font-size:11px;overflow:hidden;white-space:nowrap;text-overflow:ellipsis}
.quiz-v4 .quiz-number{display:flex;align-items:baseline;gap:5px;padding:6px 12px;border-radius:12px;background:#f0f5ff;color:#7a8aa3;font-weight:600}
.quiz-v4 .quiz-number strong{font-size:20px;color:#2b59b3;font-weight:850;line-height:1}
.quiz-v4 .progressbar{height:5px;background:#e6edfa}
.quiz-v4 .progressbar span{background:linear-gradient(90deg,#3e6fdb,#67a2fa);border-radius:0 5px 5px 0;box-shadow:0 0 7px #6395f055}
.quiz-v4 .quiz-center{display:block;overflow:auto;scrollbar-gutter:stable}
.quiz-v4 .quiz-layout{width:min(1190px,calc(100% - 40px));margin:clamp(15px,3.2vh,32px) auto 36px;display:grid;grid-template-columns:minmax(0,1fr) 230px;gap:23px;align-items:start}
.quiz-v4 .question-card{width:100%;margin:0;padding:0 0 22px;background:#fff;border:1px solid #e4eaf4;border-radius:22px;box-shadow:0 19px 50px #19365d12,0 2px 8px #2c426306;overflow:hidden}
.quiz-v4 .question-header{background:linear-gradient(115deg,#fafcff,#f2f6ff);padding:24px clamp(22px,4vw,38px) 19px;border-bottom:1px solid #e9eef7}
.quiz-v4 .question-kind{margin:0 0 17px;display:flex;align-items:center;justify-content:space-between;gap:12px}
.quiz-v4 .kind-tag{display:inline-flex;align-items:center;gap:8px;background:#e6efff;border:1px solid #d7e4fd;border-radius:999px;padding:6px 12px;color:#315db3;font-weight:760;letter-spacing:.02em;font-size:11px}
.quiz-v4 .tiny-circle{height:7px;width:7px;border-radius:50%;background:#5e91ed;display:inline-block}
.quiz-v4 .question-id{letter-spacing:.12em;color:#9aaac3;font-size:10px;font-weight:800}
.quiz-v4 .question-header h2{margin:0;color:#192d4a;font-size:clamp(18px,2.5vw,23px);font-weight:810;line-height:1.35;letter-spacing:-.025em}
.quiz-v4 .question-prompt-hint{margin:8px 0 0;color:#8393a9;font-size:12px}
.quiz-v4 .question-main{padding:26px clamp(22px,4vw,38px) 5px}
.quiz-v4 .question-text{color:#192d46;font-size:clamp(18px,2.4vw,22px);line-height:1.85;letter-spacing:.003em}
.quiz-v4 .question-text p{margin:.55em 0}
.quiz-v4 .options{margin-top:25px;gap:12px}
.quiz-v4 .opt{position:relative;align-items:center;background:#fcfdff;border:1.5px solid #dfe7f3;box-shadow:0 2px 0 #dfe6f052;border-radius:14px;min-height:59px;padding:14px 18px;gap:15px;color:#243b59;font-size:15px;transition:transform .14s,background .14s,border-color .14s,box-shadow .14s}
.quiz-v4 .opt strong{width:33px;height:33px;min-width:33px;border-radius:10px;background:#eaf0f9;color:#5d7799;font-size:13px;font-weight:800}
.quiz-v4 .opt .qa-html{min-width:0;flex:1}
.quiz-v4 .opt .opt-indicator{margin-left:auto;color:#bac7d9;font-size:20px}
.quiz-v4 .opt:not(:disabled):hover{border-color:#90b1ee;background:#f4f8ff;transform:translateY(-1px);box-shadow:0 7px 16px #2a5a9d0c}
.quiz-v4 .opt:not(:disabled):focus-visible{outline:3px solid #a1c1ff;outline-offset:2px}
.quiz-v4 .opt.correct{background:#edfaf5;border-color:#50bd94;box-shadow:0 3px 10px #2fb38013}
.quiz-v4 .opt.correct strong{background:#cbf1e3;color:#16825c}
.quiz-v4 .opt.correct .opt-indicator{color:#198562}
.quiz-v4 .opt.wrong{background:#fff1f1;border-color:#eb9699}
.quiz-v4 .opt.wrong strong{background:#ffe0e0;color:#bb3b45}
.quiz-v4 .opt.wrong .opt-indicator{color:#c6535e}
.quiz-v4 .input-answer{margin-top:19px}
.quiz-v4 .input-answer label{color:#6e84a3;font-size:12px}
.quiz-v4 .input-answer input{font-size:18px;border-radius:13px;border-color:#b8cbe7;outline:none}
.quiz-v4 .input-answer input:focus{border-color:#497ee5;box-shadow:0 0 0 4px #4e82ea1b}
.quiz-v4 .inline-guidance{display:flex;align-items:flex-start;gap:9px;margin-top:17px;background:#f2f6fe;border:1px solid #e3edfc;border-radius:11px;padding:11px 13px;font-size:12px;color:#597299;line-height:1.5}
.quiz-v4 .guidance-icon{flex:none;display:grid;place-items:center;width:25px;height:25px;border-radius:8px;background:#dce8fc;color:#3563bb;font-weight:800;font-size:11px}
.quiz-v4 .inline-answer,.quiz-v4 .cloze-input{display:inline-block;vertical-align:baseline;width:clamp(84px,12vw,135px);min-height:35px;margin:0 4px 1px;border:1px solid #9fbbea;border-bottom:2.5px solid #4b7ee1;background:#f2f7ff;border-radius:8px;padding:4px 9px;color:#173862;font:inherit;font-size:.88em;font-weight:630;line-height:1.3;outline:none;max-width:60%;transition:background .14s,border-color .14s}
.quiz-v4 .inline-answer:focus,.quiz-v4 .cloze-input:focus{background:#fff;border-color:#396ce3;box-shadow:0 0 0 3px #356bd021}
.quiz-v4 .inline-answer.is-correct,.quiz-v4 .cloze-input.is-correct{background:#eaf8f0;border-color:#3db47f;color:#136e4a}
.quiz-v4 .inline-answer.is-incorrect,.quiz-v4 .cloze-input.is-incorrect{background:#fff0f0;border-color:#e1797d;color:#ae3541}
.quiz-v4 .answer-box{background:#f5f8fe;border:1px solid #dce7fa;border-left:4px solid #7399d9;border-radius:13px;padding:17px 19px;margin:24px 0 4px;color:#314967;line-height:1.7;box-shadow:none}
.quiz-v4 .answer-box.is-right{border-left-color:#30a77d;background:#f1fbf7;border-color:#c4ecd9}
.quiz-v4 .answer-box.is-wrong{border-left-color:#de7a83;background:#fff8f8;border-color:#f2d9df}
.quiz-v4 .answer-heading{margin:0 0 13px;display:flex;align-items:center;gap:9px;font-size:15px;font-weight:820;color:#254f88}
.quiz-v4 .answer-box.is-right .answer-heading{color:#18835d}
.quiz-v4 .answer-box.is-wrong .answer-heading{color:#b14955}
.quiz-v4 .answer-symbol{display:inline-grid;place-items:center;width:23px;height:23px;border-radius:50%;background:#dce8fa;color:#315eb1;font-size:13px}
.quiz-v4 .answer-box.is-right .answer-symbol{background:#c5eedf;color:#137956}
.quiz-v4 .answer-box.is-wrong .answer-symbol{background:#ffe0e2;color:#bc4450}
.quiz-v4 .answer-reference{background:#ffffffbc;border-radius:11px;padding:12px 14px;color:#1c3657;border:1px solid #e4eaf4;overflow-wrap:anywhere}
.quiz-v4 .answer-reference small{display:block;font-size:11px;font-weight:800;color:#8190a6;margin-bottom:6px}
.quiz-v4 .html-explain{padding:12px 1px 0;line-height:1.8;color:#53657d}
.quiz-v4 .explain-heading{font-weight:800;font-size:12px;color:#758ca8;margin-bottom:4px}
.quiz-v4 .manual-grade{border-top:1px solid #dce4f2;margin-top:14px;padding-top:12px;font-size:12px;color:#5b7194}
.quiz-v4 .manual-grade .actions{margin-top:10px}
.quiz-v4 .quiz-side{background:#fff;border:1px solid #e2eaf5;border-radius:20px;padding:23px 20px;box-shadow:0 14px 30px #1f3d650a;position:sticky;top:18px}
.quiz-v4 .side-title{font-weight:810;color:#203858;font-size:15px}
.quiz-v4 .side-title span{display:block;font-size:9px;letter-spacing:.11em;color:#9bacc2;margin-top:5px}
.quiz-v4 .side-progress-ring{margin:23px auto 22px;width:142px;height:142px;border-radius:50%;background:conic-gradient(#4a79dd calc(var(--percent) * 1%),#e6eefb 0);display:grid;place-items:center}
.quiz-v4 .side-progress-ring>div{width:113px;height:113px;background:#fff;border-radius:50%;display:flex;flex-direction:column;justify-content:center;align-items:center;gap:1px}
.quiz-v4 .side-progress-ring strong{font-size:30px;font-weight:860;color:#2b57af;line-height:1.1}
.quiz-v4 .side-progress-ring small{font-size:11px;color:#91a0b7}
.quiz-v4 .side-stat{display:flex;justify-content:space-between;align-items:center;border-top:1px solid #edf1f7;padding:13px 0;font-size:12px;color:#7c8aa0}
.quiz-v4 .side-stat b{font-size:13px;color:#2c456b}
.quiz-v4 .side-help{background:#f1f6ff;border-radius:10px;padding:12px 13px;font-size:11px;line-height:1.65;color:#607da8;margin-top:5px}
.quiz-v4 .quiz-footer{padding-top:12px;padding-bottom:max(13px,env(safe-area-inset-bottom));gap:12px;border-top:1px solid #e2eafa;box-shadow:0 -7px 22px #254e8a0a;background:#fff}
.quiz-v4 .quiz-footer .btn{min-height:47px;border-radius:12px;font-size:13px}
.quiz-v4 .quiz-footer .next{min-width:190px;max-width:400px;background:linear-gradient(100deg,#285bc2,#467de1);border:0;box-shadow:0 6px 14px #275ec02a;font-weight:780;font-size:14px}
.quiz-v4 .quiz-footer .next:hover{background:linear-gradient(100deg,#194bae,#366ad0)}
.quiz-v4 .quiz-footer .next:disabled{box-shadow:none;opacity:.52}
.quiz-v4 .quiz-footer .fav{font-size:22px}
@media(max-width:900px){
 .quiz-v4 .quiz-layout{width:min(100% - 25px,760px);display:block;margin:13px auto 24px}
 .quiz-v4 .quiz-side{display:none}
 .quiz-v4 .question-card{box-shadow:0 6px 19px #2447730a}
}
@media(max-width:600px){
 .dashboard{padding-top:14px}.dashboard-compact-head{margin-bottom:13px;gap:8px}.dashboard-compact-head h1{font-size:22px}.dashboard-compact-note{max-width:125px;text-align:right;line-height:1.4;font-size:10px}
 .quiz-v4 .quiz-top{height:57px;padding:8px 11px;gap:9px}.quiz-v4 .quiz-number{padding:5px 9px}.quiz-v4 .quiz-number strong{font-size:18px}.quiz-v4 .quiz-number span{font-size:10px}
 .quiz-v4 .quiz-layout{width:calc(100% - 14px);margin:8px auto 16px}
 .quiz-v4 .question-card{border-radius:16px;padding-bottom:13px}
 .quiz-v4 .question-header{padding:15px 17px 13px}.quiz-v4 .question-header h2{font-size:18px}.quiz-v4 .question-kind{margin-bottom:9px}.quiz-v4 .question-prompt-hint{font-size:11px;margin-top:5px}
 .quiz-v4 .question-main{padding:15px 16px 3px}.quiz-v4 .question-text{font-size:17px;line-height:1.62}.quiz-v4 .options{margin-top:16px;gap:8px}
 .quiz-v4 .opt{min-height:51px;padding:10px 12px;border-radius:11px;font-size:14px;gap:10px}.quiz-v4 .opt strong{min-width:27px;width:27px;height:27px;border-radius:8px}
 .quiz-v4 .inline-answer,.quiz-v4 .cloze-input{width:clamp(87px,26vw,128px);min-height:34px;font-size:.92em;padding:3px 8px}
 .quiz-v4 .inline-guidance{font-size:11px;margin-top:13px;padding:9px 10px}
 .quiz-v4 .answer-box{padding:12px;margin-top:16px}.quiz-v4 .answer-heading{font-size:14px}
 .quiz-v4 .quiz-footer{padding:7px 8px max(8px,env(safe-area-inset-bottom));gap:6px;min-height:63px}.quiz-v4 .quiz-footer .btn{min-height:43px;font-size:12px;padding:8px}.quiz-v4 .quiz-footer .prev{width:62px;min-width:62px}.quiz-v4 .quiz-footer .prev span{display:none}.quiz-v4 .quiz-footer .reveal{min-width:55px}.quiz-v4 .quiz-footer .fav{width:40px;min-width:40px;font-size:20px}.quiz-v4 .quiz-footer .next{min-width:0;max-width:none;flex:1;font-size:13px}
}
@media(prefers-reduced-motion:reduce){.quiz-v4 .opt,.quiz-v4 .inline-answer,.quiz-v4 .cloze-input{transition:none}}

/* Study Lab subjects: categories come exclusively from authorized bank rows. */
.subject-group{border:1px solid #e5ebf4;background:#fff;border-radius:18px;margin-top:15px;padding:15px 16px 14px;box-shadow:0 5px 19px #1c3b6108}
.subject-group:first-child{margin-top:0}
.subject-heading{display:flex;align-items:center;gap:12px;margin-bottom:12px}
.subject-icon{width:43px;height:43px;flex:none;border-radius:13px;display:grid;place-items:center;font-size:16px;font-weight:850;letter-spacing:-.04em;background:#e7f0ff;color:#305cae}
.subject-color-1{background:#f4ecff;color:#8953b7}.subject-color-2{background:#fff0e4;color:#b87136}.subject-color-3{background:#e7f8f1;color:#16886a}
.subject-label{flex:1;min-width:0}.subject-label h3{font-size:16px;color:#23324a;margin:0 0 3px;font-weight:780}.subject-label span{font-size:11px;color:#8b98aa}
.subject-quantity{white-space:nowrap;color:#7d8ca2;font-size:11px;background:#f3f6fb;padding:6px 9px;border-radius:999px}
.subject-group .bank-list{display:grid;gap:8px}.subject-group .bank-card{border-radius:12px;background:#fbfcff;border:1px solid #ecf0f7;box-shadow:none;margin:0}.subject-group .bank-card:hover{background:#f5f8ff;border-color:#cbdcf5}
@media (max-width:600px){.subject-group{padding:12px;margin-top:11px;border-radius:15px}.subject-icon{width:37px;height:37px;border-radius:11px;font-size:14px}.subject-heading{margin-bottom:10px;gap:10px}.subject-label h3{font-size:15px}.subject-group .bank-card{padding:12px 10px}.subject-quantity{font-size:10px}}