@import"https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@400;500;700&family=Source+Serif+4:opsz,wght@8..60,400;8..60,600&display=swap";:root{color-scheme:light;--bg: #f4efe5;--bg-accent: #efe0c8;--panel: rgba(255, 252, 247, .92);--panel-strong: #fff9f1;--line: rgba(53, 40, 20, .14);--text: #1f1b16;--muted: #6b6257;--brand: #0e7c66;--brand-dark: #0a5d4c;--brand-soft: rgba(14, 124, 102, .12);--accent: #d97706;--rose: #b74d6f;--violet: #5a53c8;--shadow: 0 18px 60px rgba(73, 47, 18, .12)}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;min-height:100vh;font-family:Space Grotesk,sans-serif;color:var(--text);background:radial-gradient(circle at top left,rgba(217,119,6,.22),transparent 28%),radial-gradient(circle at right 10%,rgba(90,83,200,.18),transparent 24%),linear-gradient(180deg,#fbf6ef 0%,var(--bg) 55%,#efe3d5 100%)}#root{min-height:100vh}button,input,textarea{font:inherit}button:focus-visible,input:focus-visible,textarea:focus-visible,a:focus-visible{outline:3px solid rgba(14,124,102,.45);outline-offset:3px}.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}.app-shell{display:grid;grid-template-columns:320px 1fr;min-height:100vh;align-items:start}.sidebar{position:sticky;top:0;height:100vh;overflow-y:auto;padding:24px;border-right:1px solid var(--line);background:linear-gradient(180deg,#fff8ecf2,#f5e7d6cc);display:flex;flex-direction:column;gap:18px}.auth-screen{min-height:100vh;display:grid;place-items:center;padding:24px}.auth-hero-panel{width:min(1120px,100%);display:grid;grid-template-columns:1.15fr .85fr;gap:24px;padding:28px;background:radial-gradient(circle at top right,rgba(14,124,102,.15),transparent 26%),radial-gradient(circle at left center,rgba(217,119,6,.16),transparent 24%),var(--panel-strong);border:1px solid var(--line);box-shadow:var(--shadow);border-radius:28px}.auth-copy h1{margin:10px 0 14px;font-size:clamp(2.3rem,4vw,4rem);line-height:.98}.auth-copy>p{max-width:700px;margin:0;color:var(--muted);font-size:1.05rem;line-height:1.8}.auth-feature-list{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-top:24px}.auth-feature-card{padding:18px;border-radius:20px;border:1px solid var(--line);background:#fff9}.auth-feature-card p{margin:8px 0 0;color:var(--muted);line-height:1.65}.auth-panel{display:flex;flex-direction:column;gap:12px;padding:22px;border-radius:24px;border:1px solid var(--line);background:#ffffffc2;align-self:center}.brand-card,.nav-card,.panel,.hero-panel,.status-strip,.review-card{background:var(--panel);border:1px solid var(--line);box-shadow:var(--shadow);border-radius:24px}.brand-card{padding:24px}.brand-card h1{margin:8px 0 12px;font-size:2rem;line-height:1}.eyebrow,.card-label{text-transform:uppercase;letter-spacing:.16em;font-size:.72rem;color:var(--muted);margin:0}.nav-card,.panel{padding:20px}.tab-list,.topic-list,.stack{display:flex;flex-direction:column;gap:10px}.topic-search{display:block;margin:12px 0}.topic-search input{width:100%;border:1px solid var(--line);border-radius:14px;padding:10px 12px;color:var(--text);background:#ffffffbd}.topic-empty{margin:0;padding:12px;color:var(--muted);border:1px dashed var(--line);border-radius:14px;font-size:.9rem;line-height:1.45}.tab-button,.topic-button,.question-button,.ghost-button,.primary-button,.secondary-button,.mini-button{border:1px solid var(--line);border-radius:16px;cursor:pointer;transition:transform .16s ease,background .16s ease,border-color .16s ease}.tab-button,.topic-button,.question-button{background:#ffffffb8;color:var(--text)}.tab-button,.topic-button{padding:12px 14px;display:flex;justify-content:space-between;align-items:center}.tab-button.active,.topic-button.active,.question-button.active,.mini-button.active{background:linear-gradient(135deg,#0e7c6629,#5a53c81f);border-color:#0e7c6647;transform:translateY(-1px)}.ghost-button,.secondary-button,.mini-button{padding:10px 14px;background:#ffffff9e}.primary-button{padding:12px 16px;background:linear-gradient(135deg,var(--brand),var(--brand-dark));color:#fff;border:0}.primary-button:disabled{cursor:wait;opacity:.72}.secondary-button{background:#d977061a}.mini-button{flex:1}.card-row,.lesson-header,.question-meta,.action-row,.hero-panel,.hero-meta,.review-headline{display:flex;align-items:center;justify-content:space-between;gap:12px}.content{width:min(1760px,100%);min-width:0;margin:0 auto;padding:24px;display:flex;flex-direction:column;gap:18px}.hero-panel{padding:26px 28px;background:linear-gradient(135deg,#0e7c661f,#d977061a),var(--panel-strong)}.hero-copy{min-width:0}.hero-actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:18px}.hero-panel h2{margin:8px 0 10px;font-size:2.2rem}.hero-meta{flex-wrap:wrap}.hero-meta span,.pill,.score-pill{display:inline-flex;align-items:center;padding:8px 12px;border-radius:999px;font-size:.84rem;border:1px solid var(--line);background:#ffffffb3}.status-strip{padding:14px 18px;display:flex;gap:8px;align-items:center}.grid{display:grid;gap:18px}.two-columns{grid-template-columns:1fr 1fr}.learn-grid{grid-template-columns:minmax(260px,.9fr) minmax(360px,1.2fr) minmax(260px,.78fr);grid-template-areas:"map lesson plan";align-items:start}.lesson-list-panel{grid-area:map;position:sticky;top:24px;max-height:calc(100vh - 48px);overflow-y:auto}.lesson-detail-panel{grid-area:lesson}.study-plan-panel{grid-area:plan;position:sticky;top:24px;max-height:calc(100vh - 48px);overflow-y:auto}.practice-grid{grid-template-columns:.95fr 1.35fr}.bullet-grid,.review-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}.mini-panel,.step-card,.lesson-preview,.hint-box,.prompt-preview,.review-detail,.progress-row,.profile-box,.auth-box{background:#fff9;border:1px solid var(--line);border-radius:18px;padding:16px}.course-roadmap{grid-column:1 / -1}.course-roadmap h3,.source-library-panel h3{margin:8px 0 0}.semester-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-top:16px}.semester-card,.lesson-nav-button{border:1px solid var(--line);background:#ffffffa3;color:var(--text);cursor:pointer;text-align:left;transition:transform .16s ease,border-color .16s ease,background .16s ease}.semester-card{min-height:148px;padding:16px;border-radius:18px;display:flex;flex-direction:column;gap:8px}.semester-card span,.source-library-item span,.module-index{color:var(--brand-dark);font-size:.76rem;font-weight:700;letter-spacing:.07em;text-transform:uppercase}.semester-card p,.module-heading p,.module-checkpoint,.source-library-item p{margin:0;color:var(--muted);line-height:1.55}.semester-card:hover,.lesson-nav-button:hover,.source-library-item:hover{transform:translateY(-2px);border-color:#0e7c666b}.module-list{display:flex;flex-direction:column;gap:14px}.module-card{padding:16px;border:1px solid var(--line);border-radius:18px;background:#ffffff8a}.module-heading,.lesson-badges{display:flex;align-items:flex-start;justify-content:space-between;gap:12px}.module-heading h3{margin:5px 0 7px;font-size:1rem}.module-checkpoint{margin-top:12px;padding:10px 12px;border-radius:12px;background:#d977061a;font-size:.9rem}.lesson-nav-list{display:flex;flex-direction:column;gap:8px;margin-top:12px}.lesson-nav-button{border-radius:14px;padding:11px 12px;display:flex;align-items:center;justify-content:space-between;gap:12px;font-size:.9rem}.lesson-nav-button small{color:var(--muted);white-space:nowrap}.lesson-nav-button.active{background:linear-gradient(135deg,#0e7c6626,#5a53c81a);border-color:#0e7c6661}.lesson-detail-panel{min-width:0}.reader-toolbar,.reader-actions,.reader-pagination,.reader-font-controls{display:flex;align-items:center;gap:10px}.reader-toolbar{justify-content:space-between;padding-bottom:14px;border-bottom:1px solid var(--line);color:var(--muted);font-size:.84rem}.reader-font-controls .mini-button{min-width:42px;padding:7px 9px}.reader-heading{margin:22px 0 20px}.reader-heading h3{margin:7px 0 10px;font-family:"Source Serif 4",serif;font-size:clamp(1.8rem,2.4vw,2.65rem);line-height:1.08}.lecture-outline{display:flex;flex-wrap:wrap;gap:8px;margin:0 0 24px}.lecture-outline a{padding:8px 10px;border:1px solid var(--line);border-radius:999px;color:var(--brand-dark);background:#0e7c660f;font-size:.82rem;text-decoration:none}.lecture-article{display:flex;flex-direction:column;gap:24px}.lecture-section{display:grid;grid-template-columns:42px minmax(0,1fr);gap:14px;scroll-margin-top:32px}.lecture-section-number{display:grid;place-items:center;align-self:start;width:36px;height:36px;border-radius:12px;background:linear-gradient(135deg,#0e7c662b,#d9770629);color:var(--brand-dark);font-size:.76rem;font-weight:700}.lecture-section h4{margin:3px 0 10px;font-family:"Source Serif 4",serif;font-size:1.38rem;line-height:1.2}.lecture-section p,.reader-details p{margin:0 0 12px;color:var(--text);font-family:"Source Serif 4",serif;font-size:1.08rem;line-height:1.78}.lecture-section ul,.recap-card ul,.reader-details ul{margin:12px 0 0;padding-left:20px}.lecture-section li,.recap-card li,.reader-details li{margin-bottom:8px;color:var(--muted);line-height:1.55}.reader-compact .lecture-section p{font-size:1rem;line-height:1.62}.reader-large .lecture-section p{font-size:1.21rem;line-height:1.85}.reader-large .lecture-section h4{font-size:1.55rem}.recap-card{margin-top:28px;padding:18px;border:1px solid rgba(14,124,102,.2);border-radius:18px;background:#0e7c6614}.recap-card .card-label{color:var(--brand-dark)}.reader-details{margin-top:12px;border:1px solid var(--line);border-radius:16px;background:#ffffff85;padding:0 16px}.reader-details[open]{padding-bottom:15px}.reader-details summary{padding:15px 0;cursor:pointer;color:var(--text);font-weight:700}.reader-actions{justify-content:space-between;flex-wrap:wrap;margin-top:24px;padding-top:18px;border-top:1px solid var(--line)}.reader-pagination{flex-wrap:wrap}.ghost-button:disabled,.secondary-button:disabled,.primary-button:disabled{cursor:not-allowed;opacity:.5;transform:none}.lesson-badges{flex-wrap:wrap;justify-content:flex-end}.practice-task{margin:14px 0;padding:14px;border:1px solid rgba(90,83,200,.2);border-radius:16px;background:#5a53c814;color:var(--muted);line-height:1.55}.source-list{display:flex;flex-direction:column;gap:8px;margin-top:18px}.source-list a,.source-library-item{color:var(--brand-dark);text-decoration:none}.source-list a{padding:10px 12px;border:1px solid var(--line);border-radius:12px;background:#ffffff94}.source-list a span{color:var(--muted);font-size:.8rem;margin-right:7px}.study-plan-panel .step-card ul{margin:12px 0;padding-left:18px;color:var(--muted)}.study-plan-panel .step-card li{margin-bottom:7px}.source-library-list{display:grid;gap:10px;margin-top:18px}.source-library-item{display:flex;flex-direction:column;gap:5px;padding:15px;border:1px solid var(--line);border-radius:16px;background:#ffffff94}.source-library-item strong{color:var(--text)}.mini-panel ul,.lesson-section ul,.hint-box ul,.review-grid ul,.review-detail ul{margin:10px 0 0;padding-left:18px}.mini-panel li,.lesson-section li,.hint-box li,.review-grid li,.review-detail li{margin-bottom:6px;color:var(--muted)}.lesson-preview h3,.practice-panel h3{margin:0 0 8px}.lesson-preview p,.step-card p,.mini-panel p,.question-button p,.muted-text,.review-summary,.prompt-text,.lesson-note,.profile-box p,.auth-box p{color:var(--muted)}.lesson-note{padding:14px;border-radius:16px;background:#0e7c6614}.question-button{padding:14px 16px;text-align:left;display:flex;justify-content:space-between;gap:12px}.question-meta{flex-direction:column;align-items:flex-end}.auth-switch{display:flex;gap:8px}.text-input,.answer-textarea,.review-textarea{width:100%;border:1px solid var(--line);border-radius:18px;background:#ffffffdb;padding:14px 16px}.answer-textarea{min-height:220px;resize:vertical}.review-textarea{min-height:180px;resize:vertical}.input-label{display:inline-block;margin:8px 0 10px;font-weight:700}.prompt-text{font-family:"Source Serif 4",serif;font-size:1.08rem;line-height:1.7}.progress-row{display:flex;align-items:center;justify-content:space-between;gap:16px}.progress-bar{flex:0 0 180px;height:12px;border-radius:999px;overflow:hidden;background:#1f1b1614}.progress-bar span{display:block;height:100%;border-radius:inherit;background:linear-gradient(90deg,var(--brand),var(--accent))}.review-card{padding:18px}.review-card.compact{box-shadow:none}.score-pill.score-good{background:#0e7c6624}.score-pill.score-mid{background:#d9770624}.score-pill.score-low{background:#b74d6f24}.review-grid,.review-detail{margin-top:14px}.review-detail p{margin:10px 0 0;color:var(--muted);line-height:1.7}@media (max-width: 1400px){.learn-grid{grid-template-columns:minmax(280px,.8fr) minmax(440px,1.2fr);grid-template-areas:"map lesson" "plan lesson"}}@media (max-width: 1180px){.auth-hero-panel,.app-shell,.two-columns,.practice-grid,.review-grid,.bullet-grid{grid-template-columns:1fr}.sidebar{position:sticky;z-index:20;height:auto;overflow:visible;padding:12px 18px;gap:10px;border-right:0;border-bottom:1px solid var(--line);background:#fff8ecf0;-webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px);box-shadow:0 10px 30px #492f1214}.brand-card,.nav-card{padding:0;border:0;border-radius:0;background:transparent;box-shadow:none}.brand-card{display:flex;align-items:baseline;justify-content:space-between;gap:12px}.brand-card h1{margin:0;font-size:1.3rem}.brand-card>p:not(.eyebrow){display:none}.tab-list,.topic-list{flex-direction:row;overflow-x:auto;overscroll-behavior-x:contain;padding:2px 1px 7px;scrollbar-width:thin}.tab-button,.topic-button{flex:0 0 auto;white-space:nowrap}.tab-button{min-height:42px}.topic-toolbar{align-items:center}.topic-search{margin:8px 0}.topic-button{flex-basis:min(310px,70vw)}.profile-nav-card .card-label,.profile-box p{display:none}.profile-box{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:0;border:0;background:transparent}.profile-box strong{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.profile-box .primary-button{flex:0 0 auto}.auth-feature-list{grid-template-columns:1fr}.learn-grid{grid-template-columns:1fr;grid-template-areas:"lesson" "map" "plan"}.lesson-list-panel,.study-plan-panel{position:static;max-height:none;overflow:visible}.semester-grid{grid-template-columns:repeat(2,1fr)}}@media (max-width: 760px){.auth-screen,.content{padding:14px}.sidebar{padding:10px 14px}.brand-card .eyebrow,.profile-box strong{display:none}.brand-card h1{font-size:1.08rem}.auth-hero-panel{grid-template-columns:1fr;grid-template-areas:"auth" "copy";padding:18px;gap:18px}.auth-copy{grid-area:copy}.auth-panel{grid-area:auth;padding:18px}.auth-copy h1{font-size:2rem}.auth-copy>p{font-size:.96rem;line-height:1.65}.auth-feature-list{display:none}.hero-panel,.panel,.status-strip{border-radius:18px}.hero-panel,.panel{padding:16px}.hero-panel h2{font-size:1.75rem}.hero-actions{display:grid;grid-template-columns:1fr 1fr}.hero-actions .primary-button{grid-column:1 / -1}.hero-actions button,.action-row button{min-height:46px}.hero-meta span{padding:6px 9px;font-size:.76rem}.status-strip{padding:11px 13px;font-size:.86rem;align-items:flex-start}.progress-row,.card-row,.lesson-header,.hero-panel,.module-heading,.lesson-badges{align-items:flex-start;flex-direction:column}.lesson-nav-button{align-items:center;flex-direction:row}.progress-bar{width:100%;flex-basis:auto}.question-button{align-items:flex-start;flex-direction:column}.question-meta{align-items:flex-start;flex-direction:row;flex-wrap:wrap}.reader-toolbar,.reader-actions,.reader-pagination{align-items:stretch;flex-direction:column}.reader-font-controls{width:100%}.reader-font-controls .mini-button{flex:1}.reader-heading{margin-top:18px}.reader-heading h3{font-size:2rem}.lecture-outline{flex-wrap:nowrap;overflow-x:auto;padding-bottom:6px}.lecture-outline a{flex:0 0 auto}.lecture-section{grid-template-columns:1fr;gap:9px}.lecture-section-number{width:32px;height:32px;border-radius:10px}.lecture-section h4{font-size:1.3rem}.lecture-section p,.reader-details p,.reader-large .lecture-section p{font-size:1.02rem;line-height:1.72}.reader-actions>.secondary-button,.reader-pagination button{width:100%}.answer-textarea{min-height:180px}.semester-grid,.hero-actions{grid-template-columns:1fr}.hero-actions .primary-button{grid-column:auto}}