@import url('https://fonts.googleapis.com/css2?family=DM+Sans:wght@400;500;600;700&family=Manrope:wght@400;500;600;700;800&display=swap');
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h2{margin:0 0 4px;font-size:23px}.welcome p{font-size:12px;margin:0;color:var(--muted)}.pill{border:1px solid var(--line);border-radius:20px;padding:6px 12px;font-size:10px;background:#fff;white-space:nowrap}.hero{background:#e5eee1;border:1px solid #d8e4d2;border-radius:14px;display:grid;grid-template-columns:1.25fr 1fr;overflow:hidden;min-height:300px}.hero-copy{padding:34px 35px;position:relative;z-index:1}.hero h1{font-size:39px;max-width:440px}.hero h1 em{font-style:normal;color:var(--green)}.hero p{color:#657962;font-size:13px;max-width:420px}.actions{display:flex;gap:11px;align-items:center;flex-wrap:wrap;margin-top:23px}.btn{display:inline-flex;align-items:center;justify-content:center;gap:15px;padding:11px 18px;border-radius:7px;background:var(--green);color:white;font-weight:600;font-size:12px;line-height:1.5;transition:background .15s}.btn:hover{background:#175945}.btn.secondary{color:var(--ink);background:white;border:1px solid var(--line)}.btn.secondary:hover{background:#edf1e9}.btn.ghost{padding:9px 0;color:var(--green);background:transparent}.btn.orange{background:#a8512d}.hero-art{position:relative;min-height:280px;display:flex;align-items:center;justify-content:center;overflow:hidden;background:radial-gradient(ellipse at center,#f7f8e1 0,transparent 68%)}.chart-card{width:230px;height:190px;background:#ffffffcc;border:1px solid #fff;border-radius:12px;box-shadow:0 14px 30px #3a5c3021;transform:rotate(-5deg);padding:18px 20px}.chart-card .tiny{font-size:9px;color:#789078;display:flex;justify-content:space-between}.chart-card svg{width:100%;height:120px;margin-top:15px}.floating-tag{position:absolute;background:#fff;border:1px solid #dae6d4;border-radius:8px;box-shadow:var(--shadow);font-size:10px;padding:9px 13px;right:12%;bottom:29px;transform:rotate(4deg)}.floating-tag 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var(--line);padding-top:18px;margin-top:30px}.lesson-side{position:sticky;top:25px}.lesson-side .panel{padding:21px;margin-bottom:17px}.lesson-side h3{font-size:13px;margin:0 0 12px}.lesson-side p{font-size:11px;color:var(--muted)}.mini-lesson{display:block;padding:8px 0;font-size:11px;border-bottom:1px solid #edf0e8;color:#71816c}.mini-lesson.current{color:var(--green);font-weight:700}.lesson-toolbar{display:flex;gap:10px;align-items:center;justify-content:space-between;margin:20px 0}.quiz-box{background:#f0f5eb;border:1px solid #dce6d5;border-radius:11px;padding:26px;margin-top:31px}.quiz-box h2{font-size:21px;margin:8px 0}.question{border:0;padding:0;margin:25px 0}.question legend{font-weight:600;font-size:14px;line-height:1.65;padding:0;margin-bottom:13px;width:100%}.option{display:flex;align-items:flex-start;gap:10px;border:1px solid #dce4d6;background:white;border-radius:7px;padding:12px 14px;font-size:12px;margin:8px 0;cursor:pointer}.option:hover{border-color:#9cbaa2}.option input{accent-color:var(--green);margin-top:4px;flex-shrink:0}.option.correct{border-color:#64a280;background:#e8f4ec}.option.wrong{border-color:#c58573;background:#fff0e9}.feedback{padding:14px 16px;background:#fff;border-left:3px solid var(--green);font-size:12px;margin:14px 0}.feedback.wrong{border-left-color:#bb795c}.feedback strong{display:block;margin-bottom:5px}.quiz-score{font-size:13px;color:var(--green);font-weight:700}.notes{width:100%;min-height:130px;padding:12px;border:1px solid var(--line);border-radius:7px;font-size:12px;resize:vertical;color:var(--ink);background:#fdfdf9}.notes-label{font-size:11px;font-weight:600;display:block;margin:12px 0 6px}.notice{padding:15px 20px;border:1px solid #e6deca;border-radius:8px;background:#faf6e9;font-size:12px;color:#7a6c4f;margin:20px 0}.result{background:#e7f1e3;border-radius:12px;padding:27px;margin:20px 0}.result h2{margin-top:0}.big-score{font-size:42px;letter-spacing:-1.6px;font-weight:700;line-height:1.2}.exam-top{display:flex;justify-content:space-between;align-items:center;position:sticky;top:0;background:#f6f7f2f5;padding:15px 0;z-index:5;border-bottom:1px solid var(--line);gap:12px}.timer{font-family:ui-monospace,monospace;font-size:22px;font-weight:700;color:var(--green)}.exam-grid{display:grid;grid-template-columns:repeat(12,1fr);gap:6px;margin:18px 0}.q-dot{padding:5px;background:white;border:1px solid var(--line);border-radius:5px;font-size:10px;text-align:center}.q-dot.answered{background:#dcecdf;color:var(--green);border-color:#96bc9e}.q-dot.current{outline:2px solid var(--green)}.exam-card{padding:30px;background:white;border:1px solid var(--line);border-radius:11px;margin:22px 0}.exam-card h2{font-size:23px}.exam-answer{min-height:240px;font-size:14px;line-height:1.8;background:white}.exam-controls{display:flex;justify-content:space-between;gap:15px;margin-top:24px}.exam-controls .actions{margin:0}.score-select{padding:7px 12px;border:1px solid var(--line);border-radius:6px;background:white}.resource-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:17px}.resource-card{padding:22px;border:1px solid var(--line);border-radius:10px;background:white}.resource-card h3{font-size:17px;margin-top:0}.resource-card p{font-size:12px;color:var(--muted)}.file-link{display:flex;justify-content:space-between;gap:15px;align-items:center;padding:16px;border-bottom:1px solid var(--line);font-size:12px;overflow-wrap:anywhere}.file-link:hover{background:#edf3e9}.small{font-size:12px}.flex{display:flex;gap:12px;align-items:center;flex-wrap:wrap}.spacer{margin-top:25px}.empty{padding:35px;background:white;border:1px dashed #c9d7c5;border-radius:9px;text-align:center;color:#758770;font-size:13px}.bookmark{background:white;color:#73886f;border:1px solid var(--line);border-radius:6px;padding:7px 12px;font-size:11px}.bookmark.on{color:#8c652f;background:#fff1d8;border-color:#e0c99e}.icon-btn{background:transparent;font-size:21px;color:var(--ink);padding:5px}.sr-only{position:absolute;width:1px;height:1px;padding:0;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap}.timer.warning{color:#ac4829}details{margin:16px 0}summary{cursor:pointer;color:var(--green);font-weight:600;font-size:13px}.rubric{font-size:12px;background:#eef4e9;padding:17px 20px;border-radius:8px}.rubric ul{padding-left:20px}.module-breakdown{display:grid;gap:12px;margin:20px 0}.breakdown-row{display:grid;grid-template-columns:1fr 100px 45px;gap:12px;align-items:center;font-size:12px}.source-links{border:1px solid var(--line);border-radius:9px;overflow:hidden;background:white}#toast{position:fixed;bottom:20px;left:calc(50% + 80px);transform:translateX(-50%);padding:12px 22px;background:#193d30;color:white;border-radius:8px;font-size:12px;z-index:99;opacity:0;pointer-events:none;transition:opacity .2s}#toast.visible{opacity:1}.search-match{background:#f4f8ef}button.link{background:transparent;color:var(--green);padding:0;text-decoration:underline;font-size:12px}.mock-tag{background:#eef0e7;color:#71826d;padding:4px 9px;border-radius:5px;font-size:10px}
@media(min-width:1450px){.hero h1{font-size:48px}.hero{min-height:330px}.hero-copy{padding:40px}.chart-card{width:270px;height:210px}.chart-card svg{height:140px}.hero-art{min-height:320px}.module-card p{min-height:40px}}
@media(max-width:1160px){.sidebar{width:220px;padding:25px 16px}.shell{margin-left:220px}main{padding:28px}.topbar{padding:0 28px}.hero-copy{padding:27px}.hero h1{font-size:34px}.hero-art{min-width:220px}.stat{padding:13px;gap:10px}.stat-icon{width:30px;height:34px;font-size:17px}.stat strong{font-size:19px}.cards{gap:12px}.module-card{padding:20px 17px}.lesson-layout{grid-template-columns:minmax(0,1fr) 195px;gap:18px}.lesson-layout .lesson-article{padding:26px}}
@media(max-width:950px){.cards{grid-template-columns:repeat(2,1fr)}.hero{grid-template-columns:1fr}.hero-art{display:none}.hero h1{max-width:600px}.stats{grid-template-columns:repeat(2,1fr)}.bottom-grid{grid-template-columns:1fr}.lesson-layout{grid-template-columns:1fr}.lesson-side{position:static;display:grid;grid-template-columns:1fr 1fr;gap:15px}.lesson-side .module-contents{display:none}.resource-grid{grid-template-columns:1fr}.top-source{display:none}}
@media(max-width:700px){.sidebar{transform:translateX(-100%);transition:transform .2s;width:252px;box-shadow:8px 0 30px #0002}.sidebar.open{transform:translateX(0)}.shell{margin-left:0}.mobile-menu{display:block}.topbar{height:62px;padding:0 20px;justify-content:flex-start}.topbar #breadcrumb{font-size:11px}main{padding:23px 18px 35px}.welcome{align-items:flex-start}.welcome h2{font-size:21px}.welcome .pill{font-size:8px}.hero h1{font-size:35px;letter-spacing:-1.2px}.hero-copy{padding:27px 24px}.hero p{font-size:12px}.cards{gap:12px}.module-card h3{font-size:16px}.module-card p{font-size:10px}.module-card{padding:18px 15px}.module-card .module-icon{width:37px;height:37px;font-size:20px}.stats{gap:10px;margin-bottom:25px}.stat{padding:13px}.stat small{font-size:9px}.section-head h2{font-size:20px}.text-link{font-size:10px}.bottom-grid{gap:15px}.exam-banner,.study-tip{padding:23px}.scope-note{font-size:10px}footer{padding:17px 20px;flex-direction:column;gap:3px}.page-head h1{font-size:29px}.lesson-layout .lesson-article{padding:23px 20px}.lesson-side{grid-template-columns:1fr}.article{font-size:13px}.quiz-box{padding:19px 17px}.lesson-row{padding:16px 15px;gap:8px}.lesson-row .lesson-name{font-size:12px}.lesson-row .status{font-size:9px}.exam-grid{grid-template-columns:repeat(8,1fr)}.exam-card{padding:23px 19px}.exam-top{flex-wrap:wrap}.timer{font-size:20px}.exam-controls{flex-wrap:wrap}.exam-controls .actions{gap:8px}.btn{padding:10px 14px;font-size:11px}.topbar #breadcrumb span{margin:0 8px}#toast{left:50%;width:max-content;max-width:90vw}.panel{padding:22px}}
@media(prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}
@media print{.sidebar,.topbar,footer,.quiz-box,.lesson-side,.lesson-toolbar,.exam-top,.exam-grid,.exam-controls,.actions,.filters,.bookmark{display:none!important}.shell{margin:0}main{padding:0}.lesson-layout{display:block}.lesson-article,.panel,.exam-card{border:0;padding:0}.article pre{white-space:pre-wrap;background:#eee;color:#000}.article table{display:table;font-size:10px}body{background:#fff;color:#000}.article img{max-height:260px;object-fit:contain}}
/* Plain-language lesson structure and expanded practice. */
.lesson-jumps{display:flex;flex-wrap:wrap;gap:8px;margin:15px 0 25px}.lesson-jumps button{padding:8px 12px;background:#fff;color:#416b53;border:1px solid #d8e3d2;border-radius:7px;font-size:11px}.lesson-jumps button:hover{background:#e7f0e1}.lesson-map{margin-top:0}.simple-article{font-size:16px;line-height:1.85}.simple-article section{scroll-margin-top:25px;margin-bottom:30px}.simple-article .main-idea{font-size:20px;line-height:1.65;color:#254c38;margin:14px 0 24px}.simple-article h2{font-size:21px;margin:10px 0 20px}.word-box{padding:20px 23px;background:#f1f5ec;border-radius:10px}.word-box h3{font-size:14px;margin:0 0 10px}.word-box p{font-size:14px;margin-bottom:0}.simple-steps{padding-left:27px}.simple-steps li{padding:3px 0 10px 7px}.simple-steps li::marker{font-weight:700;color:#41805d}.example-box{padding:22px 24px;border-left:4px solid #7cac85;background:#f5f8f0;border-radius:0 9px 9px 0}.example-box p{margin-bottom:0}.mistake-box{padding:20px 24px;background:#fff5e9;border:1px solid #eedbc3;border-radius:10px;margin:30px 0 20px}.mistake-box h3{font-size:15px;margin:0 0 10px;color:#9b6438}.mistake-box p{margin-bottom:0;font-size:14px}.remember-box{padding:19px 24px;border:1px solid #d7e5d0;border-radius:10px;margin-bottom:27px;background:#eaf2e5}.remember-box strong{font-size:11px;text-transform:uppercase;letter-spacing:1px;color:#607f58}.remember-box p{font-size:18px;font-weight:600;margin:7px 0 0}.full-notes{border-top:1px solid #e0e7db;padding-top:20px;scroll-margin-top:25px}.full-notes summary{font-size:13px;line-height:1.7}.full-notes[open]>summary{margin-bottom:20px}.full-notes p,.full-notes li{font-size:14px}.practice-group{padding:23px 0;border-top:1px solid #dce5d6;scroll-margin-top:25px}.practice-group h3{font-size:18px;margin:0 0 7px}.practice-group .question{margin-top:10px}.subtopic-label{font-size:10px;font-weight:700;letter-spacing:1px;color:#73916f;display:block;margin:24px 0 8px}.written-practice{margin-top:22px;scroll-margin-top:25px}.written-practice h2{font-size:22px}.written-label{display:block;font-size:15px;font-weight:600;line-height:1.65;margin-bottom:14px}.written-practice textarea{font-size:14px;line-height:1.75;min-height:130px}.model-answer{background:#f2f6ed;padding:15px 18px;border-radius:8px}.model-answer p{font-size:14px;margin-top:15px;margin-bottom:8px;line-height:1.8}.quiz-box{scroll-margin-top:25px}.quiz-box .question legend{font-size:15px}.quiz-box .option{font-size:13px}.lesson-promise{font-size:14px}.question .feedback{line-height:1.8}.lesson-row .lesson-name small{line-height:1.8}
@media(max-width:700px){.simple-article{font-size:15px}.simple-article .main-idea{font-size:18px}.word-box,.example-box,.mistake-box,.remember-box{padding:17px 18px}.simple-article h2{font-size:19px}.lesson-jumps{gap:6px}.lesson-jumps button{font-size:10px;padding:8px 10px}.quiz-box .option{font-size:12px}.quiz-box .question legend{font-size:14px}.written-practice{padding:22px 19px}.written-label{font-size:14px}}
@media print{.lesson-jumps{display:none}.written-practice textarea{min-height:140px}.simple-article{font-size:12px}}

/* Connected notebook labs */
.lab-banner{background:#edf3e9}.lab-section-card{margin:18px 0}.lab-section-card h2 a{color:inherit;text-decoration:none}.lab-lesson-links{display:flex;flex-wrap:wrap;gap:8px;margin:16px 0}.lab-lesson-links a{background:#edf3e9;border:1px solid #d5dfd0;border-radius:8px;padding:9px 12px;color:#254b43;font-size:13px;text-decoration:none}.lab-link-item{border-top:1px solid #e4e9e1;padding:16px 0 4px}.lab-task-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px}.notebook-markdown{margin:26px 0;overflow-x:auto}.notebook-code{margin:14px 0;border:1px solid #d5dfd0;border-radius:10px;padding:14px}.notebook-code pre{background:#152c2b;color:#ecf2e8;overflow:auto;padding:18px;border-radius:8px;font-size:13px;line-height:1.65;max-height:560px}.notebook-code summary{cursor:pointer}.notebook-markdown table{min-width:450px}.lab-section-card p,.lab-banner p{line-height:1.7}@media(max-width:700px){.lab-task-grid{grid-template-columns:1fr}.notebook-code{padding:9px}.lab-lesson-links a{width:100%}}