:root{--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light;--background:#f7fafc;--surface:#fff;--surfaceSoft:#eef6ff;--text:#0f172a;--muted:#64748b;--border:#dbe4ef;--primary:#2563eb;--primaryDark:#1d4ed8;--accent:#14b8a6;--success:#16a34a;--warning:#f59e0b;--danger:#dc2626;--shadow:0 18px 45px #0f172a1a;background:var(--background);color:var(--text);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif}*{box-sizing:border-box}body{background:var(--background);min-width:320px;color:var(--text);margin:0}a{color:inherit;text-decoration:none}button,input,select,textarea{font:inherit}button{cursor:pointer}main{min-height:calc(100vh - 190px)}.navbar{z-index:100;border-bottom:1px solid var(--border);background:color-mix(in srgb, var(--surface) 92%, transparent);-webkit-backdrop-filter:blur(10px);align-items:center;gap:24px;height:72px;padding:0 clamp(16px,4vw,56px);display:flex;position:sticky;top:0}.brand{justify-content:center;align-items:center;height:100%;display:flex}.brand-logo{height:50px}@media (width<=768px){.navbar{gap:12px;height:60px;padding:0 14px}.brand-logo{height:40px}}.brand-mark{color:#fff;background:linear-gradient(135deg, var(--primary), var(--accent));border-radius:8px;place-items:center;width:44px;height:44px;display:grid}.brand strong,.brand small{line-height:1.1;display:block}.brand small{color:var(--muted);margin-top:3px}.nav-menu{flex:1;align-items:center;gap:24px;display:flex}.nav-links{flex:1;align-items:center;gap:6px;display:flex}.nav-links a,.login-link,.mini-link{color:var(--muted);border-radius:8px;align-items:center;gap:7px;padding:9px 10px;display:inline-flex}.nav-links a.active,.nav-links a:hover,.login-link:hover,.mini-link:hover{color:var(--primary);background:var(--surfaceSoft)}.nav-actions{align-items:center;gap:8px;display:flex}.mobile-menu-toggle{border:1px solid var(--border);width:42px;height:42px;color:var(--text);background:var(--surface);border-radius:8px;place-items:center;display:none}.icon-btn,.row-actions button{border:1px solid var(--border);width:38px;height:38px;color:var(--text);background:var(--surface);border-radius:8px;place-items:center;display:inline-grid}.row-actions .danger-action{color:var(--danger);background:color-mix(in srgb, var(--danger) 8%, var(--surface))}.row-actions .danger-action:hover{border-color:var(--danger);color:#fff;background:var(--danger)}.btn{border:1px solid #0000;border-radius:8px;justify-content:center;align-items:center;gap:8px;min-height:42px;padding:10px 16px;font-weight:700;transition:transform .18s,box-shadow .18s,background .18s;display:inline-flex}.btn:hover{transform:translateY(-1px)}.btn:disabled{cursor:not-allowed;opacity:.65;transform:none}.btn-primary{color:#fff;background:var(--primary);box-shadow:0 12px 24px color-mix(in srgb, var(--primary) 24%, transparent)}.btn-secondary{color:#082f49;background:var(--accent)}.btn-ghost{color:var(--text);background:var(--surface);border-color:var(--border)}.btn-danger{color:#fff;background:var(--danger)}.hero{text-align:center;color:#fff;background:linear-gradient(#02215073,#0d2241d9),url(https://res.cloudinary.com/dlausukqg/image/upload/v1782018448/hederPoster_mtt1gn.webp) 50%/cover no-repeat;justify-content:center;align-items:flex-end;min-height:90vh;display:flex;position:relative;overflow:hidden}.hero-inner{width:100%;max-width:1200px;padding:0 0 40px}.eyebrow{color:#22d3c5;letter-spacing:1px;margin-bottom:10px;font-size:13px;font-weight:700;display:block}.hero h1{max-width:850px;margin:0 auto;font-size:clamp(34px,4vw,64px);font-weight:800;line-height:1.05}.hero p{color:#ffffffe0;max-width:780px;margin:18px auto 0;font-size:17px;line-height:1.7}.feature-cards{grid-template-columns:repeat(4,1fr);gap:14px;margin-top:30px;display:grid}.feature-card{text-align:left;-webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);background:#0c1426b8;border:1px solid #ffffff14;border-radius:16px;align-items:center;gap:14px;padding:18px;display:flex}.feature-card svg{color:#22d3c5;flex-shrink:0;width:34px;height:34px}.feature-card strong{margin-bottom:4px;font-size:18px;font-weight:700;display:block}.feature-card span{color:#c8d7e8;font-size:14px;line-height:1.5}.hero-actions{justify-content:center;gap:14px;margin-top:28px;display:flex}.hero-actions button{min-width:190px;height:52px}@media (width<=992px){.hero{min-height:auto}.hero-inner{padding:90px 16px 35px}.feature-cards{grid-template-columns:repeat(2,1fr)}.hero h1{font-size:48px}}@media (width<=768px){.hero{min-height:auto}.hero-inner{padding:0 14px 30px}.hero h1{font-size:12px}.hero p{font-size:15px}.feature-cards{grid-template-columns:repeat(2,1fr);gap:10px;width:fit-content;display:flex}.future-card-scroll{overflow-x:auto}.feature-card{gap:10px;width:240px;padding:14px}.feature-card svg{width:26px;height:26px}.feature-card strong{font-size:14px}.feature-card span{font-size:12px}.hero-actions{flex-direction:column}.hero-actions button{width:100%;min-width:auto}}.section,.page{padding:56px clamp(16px,5vw,72px)}.section-title,.page-header{justify-content:space-between;align-items:end;gap:18px;margin-bottom:24px;display:flex}.section-title h2,.page-header h1{letter-spacing:0;margin:0;font-size:clamp(28px,4vw,42px)}.page-header p{max-width:680px;color:var(--muted);margin:8px 0 0;line-height:1.6}.muted-text{color:var(--muted);margin:0;line-height:1.6}.card-grid,.ranker-grid,.result-grid,.stats-grid,.contact-grid{grid-template-columns:repeat(3,minmax(0,1fr));gap:18px;display:grid}.teacher-card,.rank-card,.result-card,.stat-card,.panel,.form-panel,.management-form,.import-panel,.content-block,.contact-grid>div{border:1px solid var(--border);background:var(--surface);box-shadow:var(--shadow);border-radius:8px}.feature-tabs-section{gap:18px;padding-bottom:24px;display:grid}.feature-tab{border:1px solid var(--border);background:var(--surface);box-shadow:var(--shadow);border-radius:8px;grid-template-columns:minmax(280px,.92fr) minmax(0,1.08fr);align-items:stretch;display:grid;overflow:hidden}.feature-tab-reverse{grid-template-columns:minmax(0,1.08fr) minmax(280px,.92fr)}.feature-tab-media{justify-content:center;align-items:center;min-height:270px;padding:30px;display:flex}.feature-tab-media img{aspect-ratio:1;object-fit:cover;border-radius:60% 40% 30% 70%/60% 30% 70% 40%;width:100%;max-width:450px;height:100%;box-shadow:0 10px 30px #00000014}.feature-tab-content{flex-direction:column;justify-content:center;align-items:flex-start;gap:14px;padding:clamp(24px,4vw,44px);display:flex}.feature-tab-content span{color:var(--primary);letter-spacing:0;text-transform:uppercase;font-size:12px;font-weight:900}.feature-tab-content h2{max-width:720px;margin:0;font-size:clamp(26px,3vw,38px);line-height:1.15}.feature-tab-content p{max-width:720px;color:var(--muted);margin:0;line-height:1.7}.custom-series-band{background:linear-gradient(180deg, color-mix(in srgb, var(--surfaceSoft) 66%, var(--background)), var(--background))}.teacher-public-series-grid,.teacher-series-grid{grid-template-columns:repeat(3,minmax(0,1fr));gap:18px;display:grid}.teacher-public-series-card,.teacher-series-card{border:1px solid var(--border);background:var(--surface);box-shadow:var(--shadow);border-radius:8px;gap:14px;padding:20px;display:grid}.teacher-public-series-top,.teacher-series-head{justify-content:space-between;align-items:center;gap:12px;display:flex}.teacher-public-series-top span,.teacher-series-head span{color:#fff;background:var(--primary);text-transform:uppercase;border-radius:8px;align-items:center;width:fit-content;padding:7px 10px;font-size:12px;font-weight:900;display:inline-flex}.teacher-public-series-top strong,.teacher-series-head svg{color:var(--accent)}.teacher-public-series-card h3,.teacher-series-card h3{margin:0;font-size:22px;line-height:1.2}.teacher-public-series-card p,.teacher-series-card p{color:var(--muted);margin:0}.teacher-public-series-topic{border:1px solid var(--border);color:var(--text);background:color-mix(in srgb, var(--surfaceSoft) 68%, var(--surface));border-radius:8px;align-items:center;gap:8px;padding:10px 12px;font-weight:700;display:inline-flex}.teacher-public-series-meta,.teacher-series-meta{grid-template-columns:repeat(3,minmax(0,1fr));gap:12px;display:grid}.teacher-public-series-meta div,.teacher-series-meta span{min-width:0}.teacher-public-series-meta small{color:var(--muted);text-transform:uppercase;margin-bottom:5px;font-size:12px;font-weight:800;display:block}.teacher-public-series-meta strong,.teacher-series-meta span{line-height:1.5;display:block}.teacher-series-meta{color:var(--muted);font-size:14px}.series-builder{grid-template-columns:minmax(300px,.95fr) minmax(0,1.05fr);gap:18px;margin-bottom:22px;display:grid}.series-question-panel,.series-config-panel{border:1px solid var(--border);background:var(--surface);box-shadow:var(--shadow);border-radius:8px;align-content:start;gap:16px;padding:18px;display:grid}.series-panel-title{justify-content:space-between;align-items:center;gap:12px;display:flex}.series-panel-title span{color:var(--primary);text-transform:uppercase;font-size:12px;font-weight:900}.series-panel-title h2{margin:4px 0 0;font-size:24px}.series-filter-grid{grid-template-columns:1fr 1fr;gap:10px;display:grid}.series-filter-grid select{grid-column:span 2}.series-question-list{gap:10px;max-height:520px;padding-right:4px;display:grid;overflow-y:auto}.series-question-item{border:1px solid var(--border);background:var(--background);border-radius:8px;grid-template-columns:minmax(0,1fr) auto;align-items:start;gap:12px;padding:12px;display:grid}.series-question-item strong{line-height:1.4;display:block}.series-question-item span{color:var(--muted);margin-top:6px;font-size:13px;display:block}.series-question-item button{border:1px solid var(--border);min-width:72px;min-height:36px;color:var(--text);background:var(--surface);border-radius:8px;font-weight:800}.series-question-item button.active{border-color:var(--success);color:#fff;background:var(--success)}.series-topic-select{grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:10px;max-height:220px;display:grid;overflow-y:auto}.series-topic-select label{border:1px solid var(--border);background:var(--background);min-height:42px;color:var(--text);border-radius:8px;align-items:center;gap:8px;padding:10px 12px;display:flex}.series-topic-select label.active{border-color:var(--primary);background:color-mix(in srgb, var(--primary) 9%, var(--surface))}.series-topic-select input{width:auto;min-height:auto}.series-selection-summary{flex-wrap:wrap;gap:10px;display:flex}.series-selection-summary span{min-height:34px;color:var(--muted);background:var(--surfaceSoft);border-radius:8px;align-items:center;padding:7px 10px;font-weight:800;display:inline-flex}.teacher-section{background:linear-gradient(180deg, var(--background), color-mix(in srgb, var(--surfaceSoft) 68%, var(--background)));padding-top:34px}.teacher-grid{grid-template-columns:repeat(auto-fit,minmax(176px,1fr));gap:16px;display:grid}.teacher-card{isolation:isolate;text-align:center;background:linear-gradient(180deg, color-mix(in srgb, var(--primary) 10%, var(--surface)) 0%, var(--surface) 72%);justify-items:center;min-height:210px;padding:18px 14px 16px;transition:transform .18s,border-color .18s,box-shadow .18s;display:grid;position:relative;overflow:hidden}.teacher-card-2{background:linear-gradient(180deg, color-mix(in srgb, var(--accent) 10%, var(--surface)) 0%, var(--surface) 100%)}.teacher-card-3{background:linear-gradient(180deg, color-mix(in srgb, var(--warning) 14%, var(--surface)) 0%, var(--surface) 100%)}.teacher-card:before{content:"";z-index:-1;background:color-mix(in srgb, var(--primary) 14%, transparent);filter:blur(10px);border-radius:999px;width:86px;height:86px;position:absolute;top:14px}.teacher-card:hover,.teacher-card:focus-within{border-color:color-mix(in srgb, var(--primary) 34%, var(--border));transform:translateY(-4px);box-shadow:0 20px 34px #0f172a1f}.teacher-media{border:4px solid var(--surface);background:var(--surfaceSoft);border-radius:999px;width:92px;height:92px;position:relative;overflow:hidden;box-shadow:0 12px 28px #0f172a29}.teacher-media img{object-fit:cover;width:100%;height:100%;transition:transform .22s;transform:scale(1.01)}.teacher-card:hover .teacher-media img,.teacher-card:focus-within .teacher-media img{transform:scale(1.06)}.teacher-card-body{justify-items:center;gap:7px;width:100%;padding-top:14px;display:grid}.teacher-card h3,.rank-card h3,.panel h2{margin:0 0 6px}.teacher-card p,.teacher-card span,.rank-card p,.content-block p{color:var(--muted);line-height:1.6}.teacher-card h3{margin:0;font-size:17px;line-height:1.2}.teacher-card span{min-height:28px;color:var(--primary);background:color-mix(in srgb, var(--primary) 10%, var(--surface));border-radius:999px;justify-content:center;align-items:center;padding:5px 10px;font-size:12px;font-weight:900;display:inline-flex}.teacher-card p{min-height:38px;color:var(--muted);opacity:0;margin:0;font-size:13px;font-weight:700;line-height:1.45;transition:opacity .18s,transform .18s;transform:translateY(8px)}.teacher-card:hover p,.teacher-card:focus-within p{opacity:1;transform:translateY(0)}.ranker-band{background:linear-gradient(180deg, color-mix(in srgb, var(--surfaceSoft) 74%, var(--background)), var(--background))}.rank-card{background:linear-gradient(160deg, color-mix(in srgb, var(--primary) 14%, var(--surface)) 0 43%, transparent 43%), var(--surface);gap:18px;padding:18px;display:grid;position:relative;overflow:hidden}.rank-card:before{content:"";background:var(--primary);clip-path:polygon(0 0,100% 0,100% 100%,50% 76%,0 100%);opacity:.18;width:54px;height:86px;position:absolute;top:0;right:18px}.rank-2{background:linear-gradient(160deg, color-mix(in srgb, var(--accent) 15%, var(--surface)) 0 43%, transparent 43%), var(--surface)}.rank-2:before{background:var(--accent)}.rank-3{background:linear-gradient(160deg, color-mix(in srgb, var(--warning) 18%, var(--surface)) 0 43%, transparent 43%), var(--surface)}.rank-3:before{background:var(--warning)}.rank-card-head{z-index:1;justify-content:space-between;align-items:center;gap:12px;display:flex;position:relative}.rank-card-head>strong{color:var(--primary);font-size:34px;line-height:1}.rank-2 .rank-card-head>strong{color:var(--accent)}.rank-3 .rank-card-head>strong{color:var(--warning)}.rank-badge{color:#fff;background:var(--primary);border-radius:8px;align-items:center;gap:6px;padding:9px 11px;font-size:13px;font-weight:900;display:inline-flex}.rank-2 .rank-badge{background:var(--accent)}.rank-3 .rank-badge{color:#111827;background:var(--warning)}.rank-pill{color:#7c2d12;background:#ffedd5;border-radius:8px;align-items:center;gap:6px;padding:8px 10px;font-weight:800;display:inline-flex}.avatar,.small-avatar{background:var(--surfaceSoft);border-radius:50%;place-items:center;display:grid;overflow:hidden}.avatar{width:76px;height:76px;color:var(--primary)}.rank-profile{z-index:1;border:1px solid var(--border);background:color-mix(in srgb, var(--surface) 88%, transparent);border-radius:8px;align-items:center;gap:14px;min-height:96px;padding:14px;display:flex;position:relative}.rank-profile h3{font-size:22px;line-height:1.15}.rank-profile p{color:var(--muted);margin:0;font-weight:700}.rank-avatar{border:4px solid var(--surface);flex:none;width:72px;height:72px;box-shadow:0 12px 28px #0f172a26}.avatar img,.small-avatar img{object-fit:cover;width:100%;height:100%}.rank-stat-strip{z-index:1;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px;display:grid;position:relative}.rank-stat-strip div{color:var(--text);background:var(--surfaceSoft);border-radius:8px;gap:4px;padding:12px;display:grid}.rank-stat-strip span{color:var(--muted);text-transform:uppercase;font-size:12px;font-weight:900}.rank-stat-strip strong{font-size:24px;line-height:1}.segmented-control{border:1px solid var(--border);background:var(--surface);border-radius:8px;gap:8px;margin-bottom:18px;padding:6px;display:inline-flex}.segmented-control button{min-height:38px;color:var(--muted);background:0 0;border:0;border-radius:8px;padding:8px 14px;font-weight:800}.segmented-control button.active{color:#fff;background:var(--primary)}.books-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.book-card{border:1px solid var(--border);background:var(--surface);box-shadow:var(--shadow);border-radius:8px;overflow:hidden}.book-card img{object-fit:cover;width:100%;height:240px}.book-card div{gap:10px;padding:18px;display:grid}.book-card h3{margin:0}.book-card p{color:var(--muted);margin:0;line-height:1.65}.book-tag{color:#fff;text-transform:uppercase;border-radius:8px;align-items:center;width:fit-content;padding:7px 10px;font-size:12px;font-weight:900;display:inline-flex}.book-tag.free{background:var(--success)}.book-tag.paid{background:var(--warning);color:#111827}.book-actions{flex-wrap:wrap;align-items:center;gap:12px;display:flex}.book-reader-layout{grid-template-columns:260px minmax(0,1fr);align-items:start;gap:18px;display:grid}.book-topic-toggle,.book-topic-backdrop,.book-topic-nav-head{display:none}.book-topic-nav{align-self:start;gap:10px;display:grid;position:sticky;top:86px}.book-topic-nav button{border:1px solid var(--border);background:var(--surface);text-align:left;border-radius:8px;gap:5px;width:100%;padding:14px;display:grid}.book-topic-nav button.active{border-color:var(--primary);background:color-mix(in srgb, var(--primary) 8%, var(--surface))}.book-topic-nav button span{font-weight:800}.book-topic-nav button small{color:var(--muted);line-height:1.5}.book-reader-pager{border-top:1px solid var(--border);justify-content:space-between;align-items:center;gap:12px;margin-top:28px;padding-top:18px;display:flex}.book-reader-pager span{color:var(--muted);font-weight:800}.book-reader-shell{border:1px solid var(--border);background:var(--surface);box-shadow:var(--shadow);border-radius:8px;padding:clamp(18px,3vw,34px)}.markdown-renderer{gap:18px;display:grid}.markdown-renderer>*{margin:0}.markdown-renderer h1,.markdown-renderer h2,.markdown-renderer h3,.markdown-renderer h4{margin:0;line-height:1.18}.markdown-renderer p,.markdown-renderer li,.markdown-renderer blockquote{color:var(--text);line-height:1.75}.markdown-renderer ul,.markdown-renderer ol{gap:8px;margin:0;padding-left:22px;display:grid}.markdown-renderer blockquote{border-left:4px solid var(--primary);background:color-mix(in srgb, var(--primary) 8%, var(--surface));border-radius:8px;padding:14px 16px}.markdown-renderer pre{color:#f8fafc;background:#0f172a;border-radius:8px;margin:0;padding:16px;overflow-x:auto}.markdown-renderer code{background:color-mix(in srgb, var(--primary) 10%, var(--surfaceSoft));border-radius:6px;padding:.15rem .35rem}.md-image{border-radius:8px;width:100%;max-width:100%}.book-paywall{place-items:center;min-height:48vh;display:grid}.book-paywall-card{border:1px solid var(--border);background:var(--surface);max-width:620px;box-shadow:var(--shadow);border-radius:8px;justify-items:start;gap:14px;padding:28px;display:grid}.book-paywall-card p{color:var(--muted);margin:0;line-height:1.7}.inline-check{min-height:43px;color:var(--muted);align-items:center;gap:8px;padding:0 8px;font-weight:700;display:inline-flex}.lock-note{color:var(--muted);align-items:center;gap:6px;font-size:13px;display:inline-flex}.student-profile-card{background:var(--surfaceSoft);border-radius:8px;align-items:center;gap:14px;padding:14px;display:flex}.student-profile-card img{object-fit:cover;border-radius:8px;width:92px;height:92px}.student-profile-card span{color:var(--muted)}.dashboard-inline-actions{flex-wrap:wrap;gap:10px;display:flex}.book-reader-shell{border:1px solid var(--border);background:var(--surface);min-height:72vh;box-shadow:var(--shadow);border-radius:8px;overflow:hidden}.book-reader-shell iframe{border:0;width:100%;height:72vh}.student-stats{grid-template-columns:repeat(4,minmax(0,1fr))}.narrow-page{max-width:760px;margin:0 auto}.form-panel,.management-form,.import-panel{gap:16px;padding:22px;display:grid}label{color:var(--muted);gap:7px;font-weight:700;display:grid}input,select,textarea{border:1px solid var(--border);width:100%;min-height:43px;color:var(--text);background:var(--surface);border-radius:8px;outline:none;padding:10px 12px}textarea{resize:vertical;min-height:105px}input:focus,select:focus,textarea:focus{border-color:var(--primary);box-shadow:0 0 0 3px color-mix(in srgb, var(--primary) 18%, transparent)}.split-fields{grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;display:grid}.text-btn{color:var(--primary);background:0 0;border:0;font-weight:800}.exam-page{min-height:calc(100vh - 78px);padding:24px clamp(12px,3vw,38px)}.exam-topbar{justify-content:space-between;align-items:center;gap:16px;margin-bottom:12px;display:flex}.exam-topbar span,.exam-topbar strong{display:block}.exam-topbar span{color:var(--muted)}.timer{color:#fff;background:var(--danger);text-align:center;border-radius:8px;width:fit-content;padding:12px 18px;font-weight:900}.exam-close-btn{border:1px solid color-mix(in srgb, var(--danger) 28%, var(--border));min-height:44px;color:var(--danger);background:color-mix(in srgb, var(--danger) 8%, var(--surface));border-radius:8px;justify-content:center;align-items:center;gap:8px;padding:10px 14px;font-weight:800;display:inline-flex}.exam-close-btn:hover{color:#fff;background:var(--danger)}.exam-close-btn:disabled{cursor:not-allowed;opacity:.7}.progress{background:var(--border);border-radius:999px;height:10px;margin-bottom:20px;overflow:hidden}.progress span{border-radius:inherit;background:linear-gradient(90deg, var(--primary), var(--accent));height:100%;display:block}.exam-grid{grid-template-columns:170px minmax(0,1fr);gap:18px;display:grid}.question-nav{border:1px solid var(--border);background:var(--surface);border-radius:8px;grid-template-columns:repeat(4,1fr);align-content:start;gap:8px;padding:14px;display:grid}.question-nav button{aspect-ratio:1;border:1px solid var(--border);color:var(--text);background:var(--surface);border-radius:8px;font-weight:800}.question-nav button.active{border-color:var(--primary);color:#fff;background:var(--primary)}.question-nav button.answered:not(.active){border-color:var(--success);color:var(--success);background:color-mix(in srgb, var(--success) 12%, var(--surface))}.question-panel{border:1px solid var(--border);background:var(--surface);min-height:520px;box-shadow:var(--shadow);border-radius:8px;padding:clamp(20px,4vw,42px)}.question-panel h1{margin:0 0 24px;font-size:clamp(24px,3vw,36px);line-height:1.25}.question-image{object-fit:contain;background:var(--surfaceSoft);border-radius:8px;width:min(100%,520px);max-height:280px;margin-bottom:18px}.options-list{gap:12px;display:grid}.options-list button{border:1px solid var(--border);min-height:52px;color:var(--text);background:var(--background);text-align:left;border-radius:8px;align-items:center;gap:12px;padding:14px 16px;display:flex}.options-list button.selected{border-color:var(--primary);color:var(--primary);background:color-mix(in srgb, var(--primary) 10%, var(--surface))}.exam-actions{justify-content:space-between;gap:12px;margin-top:26px;display:flex}.empty-state{text-align:center;justify-items:center;display:grid}.result-hero{color:#fff;background:linear-gradient(135deg, var(--primary), var(--accent));border-radius:8px;padding:34px}.result-danger{background:linear-gradient(135deg, var(--danger), #fb7185)}.result-warning{background:linear-gradient(135deg, var(--warning), #f97316)}.result-hero h1,.result-hero p{margin:8px 0 0}.result-hero strong{margin-top:10px;font-size:clamp(46px,8vw,82px);line-height:1;display:block}.result-grid{margin-top:20px}.result-card{gap:8px;padding:18px;display:grid}.result-card span{color:var(--muted)}.result-card strong{font-size:24px}.table-wrap{border:1px solid var(--border);background:var(--surface);box-shadow:var(--shadow);border-radius:8px;overflow-x:auto}table{border-collapse:collapse;width:100%;min-width:760px}th,td{border-bottom:1px solid var(--border);text-align:left;vertical-align:top;padding:14px 16px}th{color:var(--muted);background:var(--surfaceSoft);text-transform:uppercase;font-size:13px}.student-cell{align-items:center;gap:10px;display:flex}.small-avatar{width:34px;height:34px;color:var(--primary);font-weight:900}.empty-cell{color:var(--muted);text-align:center}.content-page{max-width:980px;margin:0 auto}.content-block{padding:24px}.contact-grid>div{gap:8px;padding:22px;display:grid}.contact-grid svg{color:var(--primary)}.contact-grid span{color:var(--muted)}.footer{border-top:1px solid var(--border);color:var(--muted);background:var(--surface);grid-template-columns:1.2fr 1.3fr auto;gap:24px;padding:34px clamp(16px,5vw,72px);display:grid}.footer h3{color:var(--text);margin:0 0 8px}.footer-list{gap:9px;display:grid}.footer-list span,.socials,.socials a{align-items:center;gap:8px;display:flex}.socials a{border:1px solid var(--border);width:38px;height:38px;color:var(--primary);border-radius:8px;justify-content:center}.dashboard-shell{grid-template-columns:250px minmax(0,1fr);min-height:calc(100vh - 73px);display:grid}.sidebar{border-right:1px solid var(--border);background:var(--surface);align-content:start;gap:6px;padding:18px;display:grid}.sidebar a{color:var(--muted);border-radius:8px;align-items:center;gap:10px;padding:11px 12px;font-weight:800;display:flex}.sidebar a.active,.sidebar a:hover{color:var(--primary);background:var(--surfaceSoft)}.dashboard-content{padding:28px;overflow:hidden}.stats-grid{grid-template-columns:repeat(6,minmax(150px,1fr))}.stat-card{align-items:center;gap:12px;padding:16px;display:flex}.stat-icon{width:42px;height:42px;color:var(--primary);background:color-mix(in srgb, var(--primary) 12%, var(--surface));border-radius:8px;place-items:center;display:grid}.stat-accent .stat-icon{color:var(--accent);background:color-mix(in srgb, var(--accent) 12%, var(--surface))}.stat-success .stat-icon{color:var(--success);background:color-mix(in srgb, var(--success) 12%, var(--surface))}.stat-card p{color:var(--muted);margin:0;font-size:13px}.stat-card strong{margin-top:4px;font-size:26px;display:block}.dashboard-panels{grid-template-columns:1fr 1fr;gap:18px;margin-top:20px;display:grid}.panel{padding:20px}.bar-list,.compact-list{gap:12px;margin-top:16px;display:grid}.bar-list>div,.compact-list>div{grid-template-columns:70px 1fr auto;align-items:center;gap:12px;display:grid}.bar-list div div{background:var(--border);border-radius:999px;height:10px;overflow:hidden}.bar-list i{border-radius:inherit;background:var(--primary);height:100%;display:block}.compact-list>div{background:var(--background);border-radius:8px;grid-template-columns:1fr auto;padding:12px}.compact-list small,.table-subtext{color:var(--muted);margin-top:4px;font-size:12px;font-weight:600;line-height:1.35;display:block}.management-form{grid-template-columns:repeat(2,minmax(0,1fr));margin-bottom:20px}.management-form textarea,.management-form .split-fields,.management-form .btn{grid-column:span 2}.inline-form,.toolbar{flex-wrap:wrap;align-items:center;gap:12px;margin-bottom:18px;display:flex}.inline-form input{flex:180px}.search-box{border:1px solid var(--border);background:var(--surface);border-radius:8px;flex:280px;align-items:center;gap:8px;padding:0 12px;display:flex}.search-box input{box-shadow:none;border:0;padding-inline:0}.import-panel textarea{min-height:430px;font-family:Cascadia Code,Consolas,monospace}.wide-actions{min-width:110px}.color-field{border:1px solid var(--border);background:var(--surface);border-radius:8px;grid-template-columns:1fr auto;align-items:center;padding:8px 10px}.color-field input{border:0;width:54px;min-height:34px;padding:0}.loader{min-height:180px;color:var(--muted);justify-content:center;align-items:center;gap:10px;font-weight:800;display:flex}.loader span{border:3px solid var(--border);border-top-color:var(--primary);border-radius:50%;width:20px;height:20px;animation:.8s linear infinite spin}.privacy-shield-active main,.privacy-shield-active .navbar,.privacy-shield-active .footer,.privacy-shield-active .dashboard-shell{filter:blur(24px);pointer-events:none;-webkit-user-select:none;user-select:none}.privacy-shield{z-index:9999;color:#fff;letter-spacing:0;background:radial-gradient(circle at top,#2563ebe6,#0f172afa),#0f172a;place-items:center;display:grid;position:fixed;inset:0}.privacy-shield strong{text-align:center;background:#0f172a59;border:1px solid #fff3;border-radius:8px;padding:16px 20px;font-size:clamp(22px,3vw,40px)}@keyframes spin{to{transform:rotate(360deg)}}@media print{body{visibility:hidden!important}}@media (width<=1120px){.hero{grid-template-columns:1fr;min-height:auto}.hero-panel,.stats-grid{grid-template-columns:repeat(3,minmax(0,1fr))}.teacher-public-series-grid,.teacher-series-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}@media (width<=1024px){.navbar{flex-wrap:nowrap;align-items:center;gap:12px;padding:12px 16px}.mobile-menu-toggle{flex:none;margin-left:auto;display:inline-grid}.nav-menu{border:1px solid var(--border);background:var(--surface);max-height:calc(100vh - 86px);box-shadow:var(--shadow);border-radius:8px;flex-direction:column;align-items:stretch;gap:12px;padding:12px;display:none;position:absolute;top:calc(100% + 1px);left:12px;right:12px;overflow-y:auto}.nav-menu.open{-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);display:flex}.nav-links{flex-direction:column;align-items:stretch;width:100%}.nav-links a,.login-link,.mini-link{justify-content:flex-start;width:100%;min-height:44px}.nav-actions{border-top:1px solid var(--border);flex-direction:column;align-items:stretch;gap:8px;padding-top:12px}.nav-actions .btn,.nav-actions .icon-btn{width:100%}}@media (width<=860px){.navbar{flex-wrap:nowrap;align-items:center;gap:12px;padding:12px 16px}.feature-tab,.feature-tab-reverse{grid-template-columns:1fr}.feature-tab-reverse .feature-tab-media{order:-1}.feature-tab-media{min-height:230px}.book-reader-layout,.teacher-public-series-grid,.teacher-series-grid,.teacher-public-series-meta,.teacher-series-meta,.series-builder{grid-template-columns:1fr}.series-question-list{max-height:360px}.book-topic-toggle{border:1px solid var(--border);width:100%;min-height:46px;color:var(--text);background:var(--surface);box-shadow:var(--shadow);border-radius:8px;align-items:center;gap:10px;padding:12px 14px;font-weight:900;display:flex}.book-topic-toggle span{min-width:0;color:var(--muted);text-overflow:ellipsis;white-space:nowrap;margin-left:auto;font-size:13px;font-weight:700;overflow:hidden}.book-topic-backdrop.open{z-index:70;background:#0f172a75;border:0;display:block;position:fixed;inset:0}.book-topic-nav{z-index:80;border-right:1px solid var(--border);background:var(--surface);width:min(86vw,330px);box-shadow:var(--shadow);align-content:start;padding:16px;transition:transform .18s;position:fixed;top:0;bottom:0;left:0;overflow-y:auto;transform:translate(-105%)}.book-topic-nav.open{transform:translate(0)}.book-topic-nav-head{justify-content:space-between;align-items:center;gap:12px;padding-bottom:4px;display:flex}.book-topic-nav-head button{border:1px solid var(--border);background:var(--surfaceSoft);border-radius:8px;place-items:center;width:38px;height:38px;padding:0;display:inline-grid}.book-reader-pager{flex-wrap:wrap}.mobile-menu-toggle{flex:none;margin-left:auto;display:inline-grid}.nav-menu{border:1px solid var(--border);background:var(--surface);max-height:calc(100vh - 86px);box-shadow:var(--shadow);border-radius:8px;flex-direction:column;align-items:stretch;gap:12px;padding:12px;display:none;position:absolute;top:calc(100% + 1px);left:12px;right:12px;overflow-y:auto}.nav-menu.open{display:flex}.nav-links{flex-direction:column;align-items:stretch;width:100%}.nav-links a,.login-link,.mini-link{justify-content:flex-start;width:100%;min-height:44px}.nav-actions{border-top:1px solid var(--border);flex-direction:column;align-items:stretch;gap:8px;padding-top:12px}.nav-actions .btn,.nav-actions .icon-btn{width:100%}.card-grid,.ranker-grid,.result-grid,.contact-grid,.dashboard-panels,.books-grid,.student-stats,.hero-panel,.dashboard-shell{grid-template-columns:1fr}.sidebar{border-right:0;border-bottom:1px solid var(--border);grid-template-columns:repeat(4,minmax(120px,1fr));overflow-x:auto}.exam-grid{grid-template-columns:1fr}.question-nav{grid-template-columns:repeat(8,minmax(38px,1fr));overflow-x:auto}.footer{grid-template-columns:1fr}}@media (width<=640px){.brand{min-width:0}.brand small{display:none}.hero{padding-top:54px}.hero h1{font-size:40px}.split-fields,.management-form,.series-filter-grid,.stats-grid{grid-template-columns:1fr}.series-filter-grid select{grid-column:span 1}.series-question-item{grid-template-columns:1fr}.management-form textarea,.management-form .split-fields,.management-form .btn{grid-column:span 1}.section-title,.page-header,.exam-topbar{flex-direction:column;align-items:flex-start}.dashboard-content{padding:18px}.segmented-control{grid-template-columns:1fr 1fr;width:100%;display:grid}.student-profile-card{flex-direction:column;align-items:flex-start}.question-nav{grid-template-columns:repeat(5,minmax(40px,1fr))}}