@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');
:root{--ink:#182d25;--green:#347c62;--mint:#e8f1e9;--paper:#fbfaf7;--line:#dfe6df;--muted:#66746d}*{box-sizing:border-box}html{scroll-behavior:smooth}body{background:var(--paper);color:var(--ink);font-family:'DM Sans',sans-serif;font-size:16px}h1,h2,h3,.brand{font-family:Manrope,sans-serif;letter-spacing:-.045em}a{color:var(--green)}.site-header{border-bottom:1px solid var(--line);background:rgba(251,250,247,.95)}.brand{font-size:1.5rem;font-weight:800;color:var(--ink);text-decoration:none;letter-spacing:-.06em}.brand span:not(.brand-mark):not(.brand-dot){color:var(--green)}.brand-dot{color:#e79b70}.brand-mark{display:inline-grid;place-items:center;width:34px;height:34px;background:var(--green);color:white;border-radius:11px;margin-right:8px;font-family:serif;font-size:1.3rem}.nav-link-custom{color:var(--ink);text-decoration:none;font-weight:700}.nav-user{color:var(--muted);font-size:.9rem}.btn-dark{background:var(--ink);border-color:var(--ink)}.btn-dark:hover{background:var(--green);border-color:var(--green)}.hero{padding:86px 0 92px;background:radial-gradient(circle at 70% 30%,#edf6eb,transparent 45%),var(--paper)}.eyebrow,.section-kicker,.lesson-topline{font-weight:800;color:var(--green);letter-spacing:.15em;font-size:.72rem}.eyebrow-line{display:inline-block;width:22px;height:2px;background:var(--green);vertical-align:middle;margin-right:9px}.hero h1{font-size:clamp(3.1rem,6vw,5.6rem);line-height:1.09;font-weight:800;max-width:720px;margin:24px 0}.hero h1 em{font-style:normal;color:var(--green)}.hero-lead{font-size:1.16rem;line-height:1.75;color:var(--muted);max-width:620px;margin-bottom:28px}.hero-meta{display:flex;gap:11px;flex-wrap:wrap;color:var(--muted);font-size:.84rem;margin-top:37px}.hero-visual{background:white;padding:25px 25px 17px;border:1px solid var(--line);border-radius:26px;box-shadow:0 28px 70px #1d4a3315;transform:rotate(2deg)}.graph-label{font-family:serif;font-style:italic;font-size:1.25rem;color:var(--green);padding-left:12px}.hero-graph{display:block;width:100%;margin:8px auto}.hero-graph text{font:15px 'DM Sans',sans-serif;fill:var(--ink)}.visual-note{text-align:right;color:var(--muted);font-size:.8rem}.preview-section{padding:72px 0}.preview-section h2,.auth-section h2{font-size:clamp(2rem,4vw,3rem);font-weight:800;margin:12px 0 22px}.preview-card{height:100%;background:white;border:1px solid var(--line);border-radius:17px;padding:27px;transition:transform .2s,box-shadow .2s}.preview-card:hover{transform:translateY(-4px);box-shadow:0 12px 34px #1d4a3311}.preview-card>span,.preview-card small{color:var(--green);font-size:.75rem;font-weight:800;letter-spacing:.08em}.preview-card h3{font-size:1.32rem;font-weight:800;margin:25px 0 10px}.preview-card p{color:var(--muted);line-height:1.55;min-height:76px}.auth-section{padding:80px 0 110px;border-top:1px solid var(--line)}.auth-section p{color:var(--muted);line-height:1.7;max-width:380px}.auth-card{background:white;border:1px solid var(--line);border-radius:24px;padding:32px;box-shadow:0 15px 45px #1d4a330b}.nav-pills .nav-link{color:var(--ink);font-weight:700}.nav-pills .nav-link.active{background:var(--green)}.form-label{font-size:.88rem;font-weight:700}.form-control{padding:11px 13px;border-color:#d6ded6}.form-control:focus{border-color:var(--green);box-shadow:0 0 0 .25rem #347c6222}.site-footer{border-top:1px solid var(--line);padding:27px 0;color:var(--muted);font-size:.8rem}.dashboard{padding:70px 0 110px}.dashboard-head{margin-bottom:44px}.dashboard h1{font-size:clamp(2.4rem,5vw,4.3rem);font-weight:800;max-width:730px;margin:16px 0}.dashboard-head p{color:var(--muted);font-size:1.1rem}.progress-info{margin-top:29px;max-width:340px;color:var(--green);font-size:.85rem;font-weight:700}.progress{height:7px;background:#e2ebe2;margin-top:10px}.progress-bar{background:var(--green)}.lesson-card{display:flex;gap:22px;min-height:240px;padding:31px;background:white;border:1px solid var(--line);border-radius:20px;color:var(--ink);text-decoration:none;transition:transform .2s,box-shadow .2s}.lesson-card:hover{color:var(--ink);transform:translateY(-4px);box-shadow:0 15px 40px #1d4a3314}.lesson-number{font-family:Manrope,sans-serif;font-size:2rem;font-weight:800;color:#b5d3bd;line-height:1}.lesson-card h2{font-size:1.55rem;font-weight:800;margin:13px 0 9px}.lesson-card p{color:var(--muted);line-height:1.5}.lesson-state{font-size:.87rem;color:var(--green);font-weight:800}.lesson-layout{padding:48px 0 100px}.back-link{display:inline-block;text-decoration:none;font-weight:700;margin-bottom:42px}.lesson-topline span{padding:0 8px;color:#9ca9a0}.lesson-layout h1{font-size:clamp(2.6rem,5vw,4.5rem);font-weight:800;margin:16px 0}.lesson-intro{font-size:1.2rem;color:var(--muted);margin-bottom:40px}.lesson-body{font-size:1.05rem;line-height:1.85}.lesson-body h2{font-size:1.65rem;font-weight:800;margin:42px 0 17px}.lesson-body p{color:#46584e}.math{font-family:Georgia,serif;color:var(--ink);font-style:italic;white-space:normal}.callout{background:#e9f3e9;border-left:4px solid var(--green);border-radius:0 13px 13px 0;padding:22px 26px}.callout strong{color:var(--green)}.callout p{margin:4px 0 0}.formula-box{background:var(--ink);color:white;padding:25px 30px;border-radius:16px;margin:26px 0;display:flex;flex-direction:column;gap:10px}.formula-box span,.formula-box small{color:#aac3b1;font-size:.85rem}.formula-box strong{font-family:Georgia,serif;font-size:clamp(1.3rem,2.6vw,1.9rem);font-weight:400;line-height:1.7}.steps{padding-left:1.45rem}.steps li{padding:0 0 11px 8px}.steps li::marker{color:var(--green);font-weight:800}.answer-card{border:1px solid #c9dfd0;background:#f1f7f0;padding:22px 26px;border-radius:15px;margin:28px 0}.property-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:12px;margin:28px 0}.property-grid div{background:white;border:1px solid var(--line);border-radius:13px;padding:19px}.property-grid span{display:block;color:var(--muted);font-size:.82rem}.property-grid strong{font-family:Georgia,serif;font-size:1.23rem}.side-panel{position:sticky;top:25px;border:1px solid var(--line);background:white;border-radius:19px;padding:23px}.side-panel .section-kicker{margin-bottom:16px}.side-lesson{display:flex;gap:12px;padding:14px 10px;text-decoration:none;color:var(--ink);border-radius:9px;font-weight:700;font-size:.89rem}.side-lesson span{color:#88aa93}.side-lesson.current{background:var(--mint);color:var(--green)}.lesson-bottom{display:flex;align-items:center;justify-content:space-between;gap:20px;flex-wrap:wrap;border-top:1px solid var(--line);margin-top:48px;padding-top:30px}.lesson-bottom a{font-weight:800;text-decoration:none}@media(max-width:768px){.hero{padding:60px 0}.hero-visual{max-width:520px;margin:auto}.preview-section,.auth-section{padding:55px 0}.property-grid{grid-template-columns:1fr}.lesson-card{min-height:0}.side-panel{position:static}.hero-meta{gap:6px}.hero-meta span:nth-child(even){display:none}}
.display-math{overflow-x:auto;overflow-y:hidden}.formula-box .display-math{font-size:1.25rem}.formula-box mjx-container[jax="CHTML"][display="true"]{margin:.15em 0!important}.lesson-body mjx-container{color:inherit}.property-grid mjx-container{font-size:1.05em!important}
.parabola-pair{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;margin:25px 0}.parabola-pair>div{display:flex;flex-direction:column;align-items:center;text-align:center;background:#fff;border:1px solid var(--line);border-radius:15px;padding:18px}.parabola-pair svg{width:100%;max-width:240px;height:auto}.parabola-pair strong{color:var(--green);margin:8px 0 3px}.parabola-pair span{font-size:.86rem;color:var(--muted)}@media(max-width:560px){.parabola-pair{grid-template-columns:1fr}}
.admin-page{padding:65px 0 105px}.admin-heading{display:flex;justify-content:space-between;align-items:end;gap:20px;flex-wrap:wrap;margin-bottom:32px}.admin-heading h1{font-size:clamp(2.3rem,4.5vw,4rem);font-weight:800;margin:12px 0}.admin-heading p{color:var(--muted);margin:0}.admin-stats{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:15px;margin-bottom:30px}.admin-stats>div{background:#fff;border:1px solid var(--line);border-radius:16px;padding:23px}.admin-stats span{display:block;color:var(--muted);font-size:.88rem}.admin-stats strong{display:block;font-family:Manrope,sans-serif;font-size:2rem;margin-top:5px}.admin-search{background:#eaf3e9;border-radius:15px;padding:20px;margin-bottom:24px}.admin-search label{display:block;font-weight:700;margin-bottom:9px}.admin-search>div{display:flex;gap:10px;flex-wrap:wrap}.admin-search input{max-width:420px}.admin-result-count{font-size:.87rem;color:var(--muted);margin-bottom:13px}.admin-user-card{background:#fff;border:1px solid var(--line);border-radius:18px;padding:22px 25px;margin-bottom:15px}.admin-user-head{display:flex;justify-content:space-between;gap:15px;flex-wrap:wrap}.admin-user-head h2{font-size:1.2rem;font-weight:800;margin:0 0 4px}.admin-email,.admin-user-meta,.admin-no-lessons{color:var(--muted);font-size:.88rem}.admin-user-meta{text-align:right}.admin-no-lessons{margin:17px 0 0}.admin-table{margin:17px 0 0;font-size:.88rem;vertical-align:middle}.admin-table th{color:var(--muted);font-weight:700;white-space:nowrap}.admin-table td{padding-top:12px;padding-bottom:12px}.admin-lesson-number{color:var(--green);font-weight:800;margin-right:7px}.admin-status{display:inline-block;border-radius:100px;padding:5px 9px;font-weight:700;font-size:.75rem}.admin-status.done{background:#e5f3e9;color:#26684d}.admin-status.started{background:#f7eee1;color:#956329}.admin-pagination{display:flex;align-items:center;justify-content:center;gap:16px;margin-top:25px}.admin-empty{padding:35px;background:#fff;border:1px solid var(--line);border-radius:15px;color:var(--muted)}@media(max-width:700px){.admin-stats{grid-template-columns:1fr}.admin-user-meta{text-align:left}.admin-search input{max-width:none;width:100%}}
.quiz-section{border-top:1px solid var(--line);margin-top:54px;padding-top:42px}.quiz-section h2{font-size:2rem;font-weight:800;margin:10px 0 15px}.quiz-description{color:var(--muted);line-height:1.65}.quiz-question{border:1px solid var(--line);background:#fff;border-radius:16px;padding:23px;margin:20px 0}.quiz-question legend{font-size:1.05rem;font-weight:800;width:auto;float:none;margin:0 0 16px;line-height:1.6}.quiz-question legend>span{color:var(--green)}.quiz-options{display:grid;gap:9px}.quiz-option{display:flex;align-items:center;gap:12px;border:1px solid var(--line);border-radius:10px;padding:12px 14px;cursor:pointer;line-height:1.5}.quiz-option:hover{background:#f1f7f0;border-color:#abcab3}.quiz-option:has(input:checked){background:#e6f2e9;border-color:var(--green)}.quiz-option input{accent-color:var(--green);width:17px;height:17px;flex:none}.quiz-result{display:flex;justify-content:space-between;align-items:start;gap:20px;background:#e5f3e9;border:1px solid #bcdac4;border-radius:17px;padding:25px;margin:23px 0}.quiz-result strong{font-family:Manrope,sans-serif;font-size:1.7rem}.quiz-result p{margin:7px 0 0;color:#42624e}.quiz-result>span{color:var(--green);font-weight:800;white-space:nowrap}.quiz-review-title{font-size:1.3rem;font-weight:800;margin:30px 0 15px}.quiz-review{border:1px solid var(--line);background:#fff;border-radius:13px;padding:17px 20px;margin:10px 0}.quiz-review.correct{border-left:4px solid #347c62}.quiz-review.incorrect{border-left:4px solid #c66b52}.quiz-review-head{display:flex;justify-content:space-between;gap:12px}.quiz-review-head span{font-size:.82rem;font-weight:800;white-space:nowrap}.quiz-review.correct .quiz-review-head span{color:#347c62}.quiz-review.incorrect .quiz-review-head span{color:#b45039}.quiz-review p{margin:7px 0 0;font-size:.93rem}.admin-user-actions{display:flex;align-items:center;gap:16px;flex-wrap:wrap}.admin-modal-lesson{padding:20px 0;border-bottom:1px solid var(--line)}.admin-modal-lesson:first-child{padding-top:0}.admin-modal-lesson:last-child{border-bottom:0}.admin-modal-lesson-head{display:flex;justify-content:space-between;align-items:center;gap:10px}.admin-modal-note{font-size:.86rem;color:var(--muted);margin:8px 0 0}.admin-attempt{border:1px solid var(--line);border-radius:11px;padding:12px 15px;margin-top:11px}.admin-attempt summary{font-weight:700;cursor:pointer;color:var(--green)}.admin-answer-list{margin:17px 0 0;padding-left:23px}.admin-answer-list li{padding:10px 0 10px 8px;border-bottom:1px solid var(--line);line-height:1.5}.admin-answer-list li:last-child{border-bottom:0}.admin-answer-list li>div{font-size:.88rem;margin-top:4px}.admin-answer-list .answer-correct::marker{color:var(--green)}.admin-answer-list .answer-incorrect::marker{color:#b45039}.admin-answer-mark{font-weight:800}.answer-correct .admin-answer-mark{color:var(--green)}.answer-incorrect .admin-answer-mark{color:#b45039}@media(max-width:600px){.quiz-result,.quiz-review-head{flex-direction:column}.admin-user-meta{text-align:left}}
.lesson-card-locked{opacity:.62;background:#f1f2ee;box-shadow:none!important;transform:none!important;cursor:not-allowed}.lesson-card-locked .lesson-state{color:#776e60}.side-lesson-locked{color:#8e9991;cursor:not-allowed}.admin-stats{grid-template-columns:repeat(4,minmax(0,1fr))}.admin-stats>div{box-shadow:0 10px 28px #1d4a3309}.admin-stats small{display:block;color:var(--muted);font-size:.78rem;margin-top:4px}.admin-overview{display:grid;grid-template-columns:1.2fr 1fr;gap:18px;margin-bottom:46px}.admin-overview-card{background:#fff;border:1px solid var(--line);border-radius:18px;padding:25px;min-height:260px}.admin-section-head h2,.admin-users-heading h2{font-size:1.35rem;font-weight:800;margin:8px 0 22px}.admin-metric-row{margin:0 0 17px}.admin-metric-row>div:first-child{display:flex;justify-content:space-between;gap:10px;align-items:center}.admin-metric-row strong{font-size:.88rem}.admin-metric-row span{color:var(--muted);font-size:.76rem;white-space:nowrap}.admin-mini-track{height:7px;background:#e8efe8;border-radius:10px;margin-top:8px;overflow:hidden}.admin-mini-track>div{height:100%;background:var(--green);border-radius:10px}.admin-recent-item{display:flex;justify-content:space-between;align-items:center;gap:10px;border-bottom:1px solid var(--line);padding:12px 0}.admin-recent-item:last-child{border:0}.admin-recent-item strong,.admin-recent-item span{display:block}.admin-recent-item strong{font-size:.88rem}.admin-recent-item span{font-size:.76rem;color:var(--muted)}.admin-recent-item b{font-family:Manrope,sans-serif;color:var(--green)}.admin-users-heading{display:flex;justify-content:space-between;align-items:end;gap:15px;margin-bottom:18px}.admin-users-heading h2{font-size:1.8rem;margin:8px 0 0}.admin-users-heading>span{font-size:.8rem;color:var(--muted)}.admin-account-badge{display:inline-block;font-family:"DM Sans",sans-serif;font-size:.65rem;letter-spacing:0;font-weight:800;border-radius:100px;padding:4px 8px;vertical-align:middle;white-space:nowrap;margin-left:5px}.admin-account-badge.active{color:#26684d;background:#e5f3e9}.admin-account-badge.blocked{color:#a34c40;background:#faeae6}.admin-account-badge.administrator{color:#5655a0;background:#ebebfa}.admin-access-summary{color:var(--muted);font-size:.78rem;margin-top:6px}.admin-user-actions{justify-content:flex-end}.admin-user-actions .btn-success,.admin-access-row .btn-success{background:var(--green);border-color:var(--green)}.admin-muted{color:var(--muted);font-size:.88rem}.admin-modal-heading{font-size:1.1rem;font-weight:800;margin:7px 0}.admin-bulk-actions{display:flex;gap:9px;flex-wrap:wrap;margin:18px 0}.admin-access-row{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:13px 0;border-top:1px solid var(--line)}.admin-access-row>div{display:flex;align-items:center;gap:8px;flex-wrap:wrap}.admin-access-row strong{font-size:.9rem}@media(max-width:900px){.admin-stats{grid-template-columns:repeat(2,minmax(0,1fr))}.admin-overview{grid-template-columns:1fr}}@media(max-width:560px){.admin-stats{grid-template-columns:1fr}.admin-user-actions{justify-content:flex-start}.admin-metric-row>div:first-child{align-items:start;flex-direction:column;gap:0}.admin-users-heading{align-items:start;flex-direction:column}}
.school-path{margin:0 0 35px}.school-path>span{display:block;color:var(--green);font-size:.7rem;letter-spacing:.15em;font-weight:800;margin-bottom:12px}.school-path-classes{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:11px}.school-path-classes>div{background:#f0f2ed;border:1px solid var(--line);border-radius:13px;padding:17px 19px;color:#819087}.school-path-classes>div.active{background:#e7f3e9;border-color:#a9cbb3;color:var(--green)}.school-path-classes b,.school-path-classes small{display:block}.school-path-classes b{font-family:Manrope,sans-serif;font-size:.95rem}.school-path-classes small{font-size:.73rem;margin-top:3px}@media(max-width:650px){.school-path-classes{grid-template-columns:1fr}.school-path-classes>div{padding:11px 15px}}