:root{color-scheme:light;--navy:#142b4a;--navy-deep:#0d1c32;--ink:#172d49;--muted:#657288;--paper:#f8f5ee;--white:#fff;--line:#dce2eb;--orange:#e88848;--orange-dark:#a44c19;--blue-soft:#edf1f8;--orange-soft:#fff0e2;--red:#a52f42;--red-soft:#fff0f2;--shadow:0 12px 38px #11223b0b}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--paper);color:var(--ink);font-family:'Segoe UI',Arial,sans-serif;font-size:15px;line-height:1.65}button,input,select,textarea{font:inherit}button,a,input,select,textarea,summary{outline-offset:4px}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible,summary:focus-visible{outline:3px solid var(--orange)}button,a{-webkit-tap-highlight-color:transparent}button{cursor:pointer}button:disabled{cursor:not-allowed;opacity:.55}a{color:inherit}h1,h2,h3,h4,p{margin:0}h1,h2,h3,h4{line-height:1.2;letter-spacing:-.035em}h1{font-size:clamp(29px,3vw,43px);font-weight:650}h2{font-size:25px;font-weight:650}h3{font-size:19px}p{color:var(--muted)}img{max-width:100%}button .icon,a .icon{pointer-events:none}.icon{width:20px;height:20px;vertical-align:middle;flex-shrink:0}.skip-link{position:fixed;top:-100px;left:16px;z-index:130;background:var(--white);padding:12px 18px;border:1px solid var(--navy)}.skip-link:focus{top:12px}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}[hidden]{display:none!important}.boot{max-width:650px;padding:40px 24px;margin:12vh auto;text-align:center}.boot h1{margin:20px 0 14px}.boot .button{margin-top:20px}
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.plan-grid{display:grid;grid-template-columns:1.2fr .8fr;gap:22px;margin-top:25px}.plan-card{background:var(--white);border:1px solid var(--line);border-radius:14px;padding:30px}.plan-price{font-size:45px;font-weight:750;letter-spacing:-.05em;line-height:1.2;margin:13px 0}.plan-price small{font-size:16px;letter-spacing:0;font-weight:500}.plan-card ul,.feature-list{padding-left:20px;color:var(--muted);font-size:13px;line-height:2}.plan-card .button-row{margin-top:22px}.plan-card p{font-size:13px}.plan-card h2{margin-top:12px}.plan-fine{font-size:11px!important;margin-top:18px}.steps{counter-reset:steps;display:grid;gap:21px;margin-top:22px}.step{display:flex;gap:13px;align-items:flex-start}.step::before{counter-increment:steps;content:counter(steps);height:28px;min-width:28px;border-radius:50%;display:grid;place-items:center;background:var(--orange-soft);color:var(--orange-dark);font-weight:700;font-size:12px}.step strong{display:block;font-size:13px}.step p{font-size:12px;margin-top:3px}.topics-grid{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:13px}.topic-card{display:flex;flex-direction:column;gap:12px;align-items:flex-start;text-align:left;background:var(--white);border:1px solid var(--line);border-radius:12px;padding:22px 18px;min-height:186px;color:var(--navy);box-shadow:var(--shadow)}.topic-card:hover{border-color:#94a4bd;transform:translateY(-2px)}.topic-icon,.round-icon{display:inline-grid;place-items:center;border-radius:9px;width:39px;height:39px;background:var(--blue-soft);color:var(--navy)}.topic-card:nth-child(even) .topic-icon{background:var(--orange-soft);color:var(--orange-dark)}.topic-title{font-size:14px;font-weight:650;line-height:1.4;min-height:40px}.topic-meta{font-size:11px;color:var(--muted)}.topic-bottom{margin-top:auto;width:100%;display:flex;justify-content:space-between;align-items:center;gap:8px;font-size:10px;color:var(--muted)}.topic-bottom .icon{width:14px;height:14px}.stats-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:15px;margin:24px 0}.stat-card{display:flex;align-items:center;gap:13px;padding:20px;background:var(--white);border:1px solid var(--line);border-radius:12px}.stat-card strong{font-size:28px;line-height:1.25;letter-spacing:-.04em;display:block}.stat-card strong small{font-size:13px;font-weight:500;letter-spacing:0}.stat-card span.label{font-size:10px;display:block;color:var(--muted);line-height:1.5;margin-top:4px}.mode-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}.mode-card{display:flex;flex-direction:column;align-items:flex-start}.mode-card h2{font-size:22px;margin:17px 0 10px}.mode-card p{margin-bottom:20px}.mode-card .button{margin-top:auto}.bottom-grid,.about-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px;margin-top:24px}.about-grid h3{margin:23px 0 10px}.about-grid p+p{margin-top:15px}.empty-state{text-align:center;padding:42px 24px;background:var(--white);border:1px dashed #b8c4d5;border-radius:13px}.empty-state h2{margin-top:17px}.empty-state p{max-width:630px;margin:13px auto 22px;font-size:13px}.empty-state .button-row{justify-content:center}
.topic-progress-list{display:grid;gap:23px;margin-top:25px}.topic-progress{display:flex;gap:14px;align-items:center}.topic-progress>div:last-child{flex:1;min-width:0}.progress-label{display:flex;justify-content:space-between;gap:15px;font-size:13px}.progress-label>span{font-size:11px;color:var(--muted)}.bar{height:7px;overflow:hidden;border-radius:4px;background:var(--blue-soft);margin:8px 0 4px}.bar>span{display:block;height:100%;background:var(--navy)}.topic-progress small{font-size:10px;color:var(--muted)}.history-list{margin-top:18px}.history-item{display:flex;width:100%;align-items:center;gap:14px;background:none;border:0;border-top:1px solid var(--line);padding:17px 0;text-align:left;color:var(--navy)}.history-item>span:nth-child(2){flex:1}.history-item small{display:block;color:var(--muted);font-size:11px;margin-top:3px}.history-item strong{font-size:14px}.history-item>.icon{width:15px}.table-wrap{overflow-x:auto}.data-table{border-collapse:collapse;width:100%;font-size:12px;margin-top:18px}.data-table th,.data-table td{text-align:left;vertical-align:top;padding:13px 11px;border-bottom:1px solid var(--line)}.data-table th{font-weight:650;background:var(--blue-soft);white-space:nowrap}.data-table td small{display:block;word-break:break-word;color:var(--muted)}.data-table td .button{white-space:nowrap}.status{font-size:10px;font-weight:700;display:inline-block;padding:4px 8px;border-radius:20px;background:var(--blue-soft);color:var(--navy)}.status.pending{background:var(--orange-soft);color:var(--orange-dark)}.status.rejected,.status.cancelled{background:var(--red-soft);color:var(--red)}.billing-card{margin-top:22px}.billing-card p{font-size:13px}.billing-card .button-row{margin-top:20px}.code-reference{font-family:ui-monospace,Consolas,monospace;font-size:11px;overflow-wrap:anywhere}.account-detail{display:grid;gap:9px;margin:18px 0 22px;padding:16px;background:var(--blue-soft);border-radius:8px;font-size:13px}.account-detail dt{font-weight:700}.account-detail dd{margin:0;overflow-wrap:anywhere}
.quiz-toolbar{display:flex;align-items:center;gap:18px;justify-content:space-between;margin-bottom:19px;font-size:12px;color:var(--muted)}.timer{display:inline-flex;gap:8px;align-items:center;padding:8px 12px;background:var(--white);border:1px solid var(--line);border-radius:7px;color:var(--navy);font-variant-numeric:tabular-nums}.quiz-card{max-width:880px;margin:0 auto;background:var(--white);border:1px solid var(--line);border-radius:15px;padding:34px;box-shadow:var(--shadow)}.question-meta{display:flex;justify-content:space-between;align-items:center;gap:13px;color:var(--muted);font-size:11px;margin-bottom:23px}.topic-pill{font-size:10px;padding:5px 9px;border-radius:20px;background:var(--blue-soft);color:var(--navy)}.question-title{font-size:26px;line-height:1.4;letter-spacing:-.025em}.question-instruction{font-size:12px;margin:14px 0 20px}.options{border:0;padding:0;margin:0;display:grid;gap:10px}.option{position:relative;display:flex;align-items:center;gap:13px;padding:15px;border:1px solid var(--line);border-radius:9px;font-size:14px;cursor:pointer;color:var(--ink)}.option input{accent-color:var(--navy);width:18px;height:18px;flex-shrink:0;margin:0}.option-letter{height:28px;min-width:28px;display:grid;place-items:center;border-radius:6px;background:var(--blue-soft);color:var(--muted);font-size:12px;font-weight:700}.option.selected,.option.saved{border-color:var(--navy);background:var(--blue-soft)}.option.correct{border-color:#6889b8;background:#eef3fc}.option.incorrect{border-color:#c7808d;background:var(--red-soft)}.option-text{flex:1}.option-result{font-size:10px;font-weight:700;color:var(--navy);white-space:nowrap}.option.incorrect .option-result{color:var(--red)}.question-actions{display:flex;gap:18px;align-items:center;justify-content:space-between;margin-top:23px}.question-actions p{font-size:11px;max-width:420px}.correction{border-top:1px solid var(--line);padding-top:23px;margin-top:27px}.correction h3{display:flex;gap:9px;align-items:center;font-size:20px}.learning-point{background:var(--orange-soft);color:var(--orange-dark);border-radius:8px;padding:15px;font-size:13px;margin-top:17px}.explanation-list{display:grid;gap:15px;margin-top:20px}.explanation-list strong{font-size:12px}.explanation-list p{font-size:13px;line-height:1.7;margin-top:5px}.source-box{background:var(--paper);padding:15px;border-radius:8px;margin-top:20px;font-size:12px}.source-link{display:inline-flex;align-items:center;gap:8px;color:var(--navy);font-weight:600;text-decoration:none}.source-link:hover{text-decoration:underline}.source-box small{display:block;color:var(--muted);font-size:10px;margin-top:6px}.report-link{display:inline-block;font-size:11px;margin-top:13px;color:var(--muted)}.result-summary{display:flex;align-items:center;gap:29px;background:var(--white);border:1px solid var(--line);border-radius:14px;padding:29px;margin-bottom:25px}.score-ring{border:10px solid var(--blue-soft);height:145px;width:145px;flex-shrink:0;display:flex;flex-direction:column;align-items:center;justify-content:center;border-radius:50%;color:var(--navy)}.score-ring strong{font-size:37px;line-height:1.3;letter-spacing:-.05em}.score-ring small{font-size:10px;color:var(--muted)}.result-summary p{font-size:13px;margin-top:10px}.result-summary .button-row{margin-top:20px}.result-questions{display:grid;gap:13px}.review-card{border:1px solid var(--line);background:var(--white);border-radius:12px}.review-card summary{display:flex;align-items:center;gap:14px;cursor:pointer;list-style:none;padding:19px 20px}.review-card summary::-webkit-details-marker{display:none}.review-card summary>div{flex:1}.review-card summary small{font-size:10px;color:var(--muted);display:block}.review-card summary strong{font-size:13px;line-height:1.6;display:block;margin-top:3px}.result-status{height:28px;min-width:28px;display:grid;place-items:center;border-radius:50%;background:var(--blue-soft);color:var(--navy);font-size:14px}.result-status.wrong{background:var(--red-soft);color:var(--red)}.result-status.unanswered{background:var(--paper);color:var(--muted)}.review-card>.correction{margin:0 21px 24px}.details-label{font-size:10px;color:var(--muted);white-space:nowrap}.unanswered-note{font-size:12px;padding:0 21px 15px}
.modal-backdrop{position:fixed;inset:0;z-index:100;background:#071526aa;display:grid;place-items:center;padding:20px}.dialog{width:100%;max-width:570px;background:var(--white);border-radius:15px;box-shadow:0 20px 80px #06112177;padding:29px;max-height:calc(100dvh - 40px);overflow-y:auto}.dialog h2{font-size:26px;margin-bottom:15px}.dialog p{font-size:13px;margin-bottom:16px}.dialog label:not(.check-field){display:block;font-size:13px;font-weight:650;margin:18px 0 7px}.dialog input[type="text"]{width:100%;min-height:46px;border:1px solid #aab8cb;background:var(--white);padding:11px 12px;color:var(--navy);border-radius:7px}.check-field{display:flex;gap:10px;align-items:flex-start;font-size:12px;line-height:1.7;margin:18px 0 22px}.check-field input{accent-color:var(--navy);margin-top:4px;width:17px;height:17px;flex-shrink:0}.dialog .button-row{justify-content:flex-end}.dialog .notice{margin:18px 0}.demo-header{background:var(--white);border-bottom:1px solid var(--line);padding:19px max(20px,calc((100vw - 1100px)/2));display:flex;justify-content:space-between;align-items:center;gap:20px}.demo-header .brand{font-size:13px}.demo-main{max-width:1000px;padding:32px 24px;margin:auto;min-height:calc(100vh - 200px)}.demo-main .page-heading{margin-bottom:24px}.demo-footer{max-width:1000px;margin:auto;padding:20px 24px;font-size:11px;color:var(--muted);border-top:1px solid var(--line)}
@media(min-width:1550px){#main{padding-top:44px}.hero-copy{padding:44px}.hero-card{min-height:360px}.hero-art{min-height:360px}.topic-card{min-height:205px}.topic-title{font-size:15px}}
@media(max-width:1200px){.sidebar{width:215px;padding-inline:17px}.workspace{margin-left:215px;width:calc(100% - 215px)}.topbar{padding-inline:27px}#main{padding:30px 27px}.main-footer{padding-inline:27px}.topics-grid{grid-template-columns:repeat(3,minmax(0,1fr))}.hero-copy{padding:29px}.hero-card h2{font-size:35px}.hero-art{min-width:220px}.hero-meta{gap:13px}.stat-card{gap:9px;padding:17px 13px}.stat-card strong{font-size:25px}.stat-card .round-icon{height:31px;width:31px}.mode-grid{gap:13px}.mode-card{padding:22px}.mode-card h2{font-size:21px}.plan-grid{grid-template-columns:1fr 1fr}.sync-badge{display:none}}
@media(max-width:900px){.sidebar{width:190px;padding-inline:12px}.workspace{margin-left:190px;width:calc(100% - 190px)}.nav-item{font-size:11px;padding-inline:10px;gap:8px}.brand strong{font-size:21px}.brand img{width:36px;height:36px}.course-tag{font-size:9px}.hero-card{grid-template-columns:1fr}.hero-art{display:none}.hero-card h2{font-size:36px}.stats-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.mode-grid{grid-template-columns:1fr}.mode-card{display:grid;grid-template-columns:42px 1fr;gap:10px 16px}.mode-card>.round-icon{grid-row:1/4}.mode-card h2{margin:0}.mode-card p,.mode-card .button{grid-column:2}.mode-card p{margin:0}.mode-card .button{justify-self:start;margin-top:8px}.plan-grid,.about-grid,.bottom-grid{grid-template-columns:1fr}.page-heading{align-items:flex-start;flex-direction:column}.account-name{display:none}.result-summary{padding:23px;gap:20px}.details-label{display:none}.notice,.access-banner,.resume-strip{align-items:flex-start}.access-banner,.resume-strip{flex-wrap:wrap}.access-banner>div,.resume-strip>div{flex-basis:75%}.topic-title{font-size:13px}.topic-meta{font-size:10px}}
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