:root{--bg:#f4f7fb;--paper:#fff;--ink:#172033;--muted:#667085;--line:#dfe6ef;--accent:#2457a7;--accent2:#163c78;--side:#102a50;--side2:#173b6e;--shadow:0 12px 35px rgba(15,35,65,.09)}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:Inter,system-ui,-apple-system,"Segoe UI",Arial,sans-serif;background:var(--bg);color:var(--ink);line-height:1.6}.layout{display:flex;min-height:100vh}.sidebar{width:300px;position:fixed;inset:0 auto 0 0;overflow-y:auto;background:linear-gradient(180deg,var(--side),var(--side2));color:#fff;padding:22px 16px;z-index:20}.brand{display:flex;gap:12px;align-items:center;color:#fff;text-decoration:none;padding:6px 8px 18px;border-bottom:1px solid rgba(255,255,255,.16);margin-bottom:12px}.brand-mark{display:grid;place-items:center;width:45px;height:45px;border-radius:13px;background:#fff;color:var(--side);font-weight:800}.brand strong{display:block;font-size:1.06rem}.brand small{display:block;color:#c9d5e7}.nav-group{margin:18px 9px 7px;color:#aebfda;font-size:.72rem;font-weight:800;text-transform:uppercase;letter-spacing:.06em}.nav-link{display:grid;grid-template-columns:30px 1fr;gap:7px;color:#e9f0fb;text-decoration:none;padding:8px 9px;border-radius:10px;font-size:.88rem;line-height:1.28;margin:2px 0}.nav-link:hover{background:rgba(255,255,255,.10)}.nav-link.active{background:#fff;color:#163c78;font-weight:700}.nav-num{font-variant-numeric:tabular-nums;opacity:.72}.sidebar-bottom{margin-top:22px;padding-top:14px;border-top:1px solid rgba(255,255,255,.16);display:grid;gap:5px}.sidebar-bottom a{color:#dbe7f8;text-decoration:none;padding:5px 9px}.main{margin-left:300px;width:calc(100% - 300px);min-height:100vh}.page-shell{max-width:1120px;margin:0 auto;padding:42px 42px 70px}.menu-button{display:none}.topic-header,.home-hero{margin-bottom:28px}.eyebrow,.login-kicker{color:var(--accent);font-size:.78rem;text-transform:uppercase;font-weight:800;letter-spacing:.07em}.topic-header h1,.home-hero h1{font-size:clamp(2rem,4vw,3.2rem);line-height:1.12;margin:.25rem 0 .55rem}.home-hero p{font-size:1.1rem;color:var(--muted);max-width:760px}.lesson-content,.topic-group,.status-card{background:var(--paper);border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow);padding:34px}.lesson-content h2{margin-top:2.1rem;color:#183e76;border-bottom:1px solid #e5eaf1;padding-bottom:.4rem}.lesson-content h2:first-child{margin-top:.2rem}.lesson-content h3{color:#254b82}.lesson-content img{max-width:100%;height:auto;border-radius:8px}.lesson-content figure{margin:1.2rem auto;max-width:100%;text-align:center}.lesson-content table{border-collapse:collapse;max-width:100%;display:block;overflow-x:auto;margin:1rem 0}.lesson-content td,.lesson-content th{border:1px solid #cbd5e1;padding:.45rem .65rem;vertical-align:top}.lesson-content blockquote{border-left:4px solid #9ab4dc;background:#f6f9fd;margin:1rem 0;padding:.8rem 1.1rem}.lesson-content a{color:#1757a6}.lesson-content video,.lesson-content audio{max-width:100%}.embedded-frame{width:100%;min-height:450px;border:1px solid var(--line);border-radius:10px}.katex-html{display:none!important}.math-tex{overflow-x:auto;max-width:100%;display:inline-block;vertical-align:middle}.math-tex math,math{font-family:"Cambria Math","STIX Two Math",serif;max-width:100%}.row,.col-xs-12,.col-sm-12,.col-md-12,.col-lg-11,.col-xl-9{display:block!important;width:100%!important;max-width:none!important;margin-left:0!important;margin-right:0!important;padding-left:0!important;padding-right:0!important}.content-block{margin-bottom:1.6rem}.board-section{margin:0 0 2.2rem}.board-section>h2{margin-top:.2rem}.board-card{border:1px solid #dde5ef;border-radius:14px;background:#fbfdff;padding:18px;margin:14px 0}.board-card h3{margin-top:0}.resource-card{display:flex;align-items:center;gap:14px;border:1px solid #d9e3ef;border-radius:12px;background:#fff;padding:12px;margin:10px 0;text-decoration:none!important;color:var(--ink)!important;transition:.15s}.resource-card:hover{transform:translateY(-1px);box-shadow:0 7px 18px rgba(20,50,90,.08)}.resource-card img{width:120px;max-height:90px;object-fit:cover;border-radius:8px}.resource-text{display:flex;flex-direction:column;min-width:0}.resource-text small{color:var(--muted);margin-top:3px}.link-card:before{content:'↗';display:grid;place-items:center;width:42px;height:42px;border-radius:50%;background:#eef4fc;color:var(--accent);font-size:1.3rem;flex:0 0 auto}.muted-note{color:var(--muted);font-style:italic}.admin-preview{display:inline-block;background:#fff4d5;color:#6b5100;border:1px solid #efd78a;padding:7px 11px;border-radius:9px;margin-top:7px}.pager{display:flex;justify-content:space-between;gap:20px;margin-top:22px}.pager a{background:#fff;border:1px solid var(--line);padding:11px 14px;border-radius:10px;color:var(--accent);text-decoration:none;max-width:45%}.topic-group{margin:20px 0}.topic-group h2{margin-top:0}.topic-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.topic-card{display:grid;grid-template-columns:46px 1fr auto;align-items:center;gap:12px;border:1px solid var(--line);border-radius:13px;padding:14px;text-decoration:none;color:var(--ink);background:#fbfdff}.topic-card:hover{border-color:#9fb7d6;background:#fff}.topic-number{display:grid;place-items:center;width:42px;height:42px;background:#eaf1fb;color:var(--accent2);border-radius:10px;font-weight:800}.topic-title{font-weight:700}.lock-badge{font-size:.75rem;color:#7a5b00;background:#fff1bd;padding:2px 7px;border-radius:10px}.status-card{text-align:center;max-width:650px;margin:9vh auto}.status-icon{font-size:3rem}.primary-button,.secondary-button{display:inline-block;border:0;border-radius:10px;padding:.78rem 1rem;font:inherit;font-weight:750;text-decoration:none;cursor:pointer}.primary-button{background:var(--accent);color:#fff}.secondary-button{background:#fff;border:1px solid var(--line);color:var(--accent)}.login-bg{min-height:100vh;display:grid;place-items:center;padding:24px;background:linear-gradient(145deg,#eaf1fb,#f8fafc)}.login-box{width:min(430px,100%);background:#fff;padding:34px;border-radius:20px;box-shadow:0 20px 55px rgba(20,50,90,.14)}.login-box h1{margin:.2rem 0}.login-box label,.password-grid label{display:block;font-weight:700;margin-top:1rem}.login-box input,.password-grid input{width:100%;margin-top:.35rem;padding:.8rem .9rem;border:1px solid #cbd5e1;border-radius:10px;font:inherit}.login-box .primary-button{width:100%;margin-top:1rem}.error-msg{color:#a32020;background:#fff0f0;padding:.6rem;border-radius:8px}.small-link{text-align:center;font-size:.9rem}.admin-body{background:#eef3f8}.admin-shell{max-width:1050px;margin:35px auto;padding:0 20px 70px}.admin-header{display:flex;justify-content:space-between;gap:25px;align-items:flex-start}.admin-header h1{margin:.2rem 0}.admin-actions{display:flex;gap:8px;flex-wrap:wrap}.admin-table,.password-panel,.admin-help{background:#fff;border:1px solid var(--line);border-radius:16px;box-shadow:var(--shadow);margin-top:20px;overflow:hidden}.admin-group{padding:10px 16px;background:#eef4fb;font-size:.82rem;font-weight:800;color:#315681;text-transform:uppercase}.admin-row{display:grid;grid-template-columns:60px 1fr auto;gap:12px;align-items:center;padding:13px 16px;border-top:1px solid #edf1f5}.admin-topic{display:flex;flex-direction:column}.admin-topic small{color:var(--muted)}.admin-row>a{color:var(--accent);text-decoration:none}.switch{position:relative;width:46px;height:25px}.switch input{display:none}.switch span{position:absolute;inset:0;background:#b8c0cc;border-radius:25px;cursor:pointer}.switch span:after{content:'';position:absolute;width:19px;height:19px;left:3px;top:3px;background:white;border-radius:50%;transition:.18s}.switch input:checked+span{background:#2e6ab3}.switch input:checked+span:after{transform:translateX(21px)}.admin-save{padding:15px 0}.password-panel,.admin-help{padding:24px}.password-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px}.admin-message{padding:11px 14px;margin:15px 0;border-radius:9px}.admin-message.success{background:#e9f8ef;color:#166534}.admin-message.error{background:#fff0f0;color:#a32020}code{background:#eef2f6;padding:.15rem .35rem;border-radius:5px}
@media(max-width:900px){.sidebar{transform:translateX(-100%);transition:.2s;width:290px}.menu-open .sidebar{transform:translateX(0)}.main{margin-left:0;width:100%}.page-shell{padding:25px 18px 55px}.menu-button{display:inline-block;margin:14px 18px 0;border:1px solid var(--line);background:#fff;padding:8px 11px;border-radius:9px}.topic-grid{grid-template-columns:1fr}.lesson-content,.topic-group{padding:22px}.admin-header{display:block}.admin-actions{margin-top:15px}.password-grid{grid-template-columns:1fr}.resource-card img{width:90px}.pager a{max-width:48%;font-size:.9rem}}

.missing-media{border:1px dashed #d2a43b;background:#fff9e8;padding:14px 16px;border-radius:11px;margin:1rem 0}.missing-media strong{color:#6a5000}.missing-media p{margin:.25rem 0 .45rem;color:#6b7280}.missing-media a{font-weight:700}

/* PDF-Materialbereich */
.materials-panel{background:var(--paper);border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow);padding:26px 30px;margin-top:22px}.materials-heading{display:flex;align-items:flex-end;justify-content:space-between;gap:16px;margin-bottom:14px}.materials-heading h2{margin:.15rem 0 0;color:#183e76}.material-count{display:inline-flex;align-items:center;white-space:nowrap;background:#eef4fb;color:#315681;border-radius:999px;padding:4px 10px;font-size:.8rem;font-weight:800}.material-list{display:grid;gap:9px}.material-item{display:grid;grid-template-columns:48px 1fr auto;gap:13px;align-items:center;border:1px solid #dce5ef;border-radius:12px;padding:12px 14px;text-decoration:none;color:var(--ink);background:#fbfdff}.material-item:hover{background:#fff;border-color:#9fb7d6;box-shadow:0 6px 18px rgba(20,50,90,.07)}.pdf-icon{display:inline-grid;place-items:center;width:42px;height:42px;border-radius:9px;background:#fbe9e9;color:#9f2424;font-size:.72rem;font-weight:900;letter-spacing:.04em}.material-text,.admin-file-row>div:nth-child(2){display:flex;flex-direction:column;min-width:0}.material-text strong,.admin-file-row strong{overflow-wrap:anywhere}.material-text small,.admin-file-row small{color:var(--muted)}.download-label{color:var(--accent);font-weight:750;white-space:nowrap}
.materials-admin-panel{background:#fff;border:1px solid var(--line);border-radius:16px;box-shadow:var(--shadow);margin-top:20px;padding:24px}.materials-admin-panel h2{margin:.2rem 0}.material-upload-form{display:grid;grid-template-columns:minmax(220px,1.4fr) minmax(220px,1.4fr) auto;gap:12px;align-items:end;margin:18px 0 6px}.material-upload-form label{font-weight:700}.material-upload-form select,.material-upload-form input[type=file]{display:block;width:100%;margin-top:.35rem;padding:.7rem .8rem;border:1px solid #cbd5e1;border-radius:10px;background:#fff;font:inherit}.upload-note{margin:.4rem 0 1.2rem;color:var(--muted);font-size:.9rem}.material-admin-list{display:grid;gap:10px;margin-top:18px}.material-topic-details{border:1px solid #e0e7ef;border-radius:12px;background:#fbfdff;overflow:hidden}.material-topic-details summary{display:flex;justify-content:space-between;gap:12px;align-items:center;cursor:pointer;padding:12px 14px;font-weight:750}.material-topic-details[open] summary{border-bottom:1px solid #e8edf3;background:#f4f8fd}.empty-materials{color:var(--muted);padding:0 14px 12px}.admin-file-list{display:grid}.admin-file-row{display:grid;grid-template-columns:48px minmax(0,1fr) auto;gap:12px;align-items:center;padding:11px 14px;border-top:1px solid #edf1f5}.admin-file-row:first-child{border-top:0}.admin-file-actions{display:flex;align-items:center;gap:7px}.admin-file-actions form{margin:0}.compact{padding:.52rem .72rem;font-size:.88rem}.danger-button{display:inline-block;border:1px solid #efb4b4;border-radius:10px;padding:.78rem 1rem;background:#fff4f4;color:#a32020;font:inherit;font-weight:750;cursor:pointer}
@media(max-width:900px){.materials-panel{padding:20px}.material-upload-form{grid-template-columns:1fr}.material-item{grid-template-columns:44px 1fr}.download-label{grid-column:2}.admin-file-row{grid-template-columns:44px 1fr}.admin-file-actions{grid-column:2;flex-wrap:wrap}.materials-heading{align-items:flex-start;flex-direction:column}}