:root{--font-sans:Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;--color-page:#f7fafc;--color-surface:#fff;--color-surface-muted:#eef5f9;--color-surface-strong:#dcebf3;--color-text:#17202a;--color-text-muted:#5b6876;--color-text-soft:#7c8996;--color-border:#d6e2ea;--color-border-strong:#aac2d0;--color-primary:#1e5f8f;--color-primary-strong:#16466b;--color-primary-soft:#e3f0f8;--color-accent:#2f8f83;--color-accent-soft:#e0f4ef;--color-warning:#9b6b16;--color-warning-soft:#fff3d9;--color-danger:#b24141;--color-danger-soft:#fbe5e5;--color-focus:#123d5d;--shadow-soft:0 18px 55px #1e4b691f;--shadow-control:0 8px 28px #1e4b691a;--space-1:.25rem;--space-2:.5rem;--space-3:.75rem;--space-4:1rem;--space-5:1.25rem;--space-6:1.5rem;--space-8:2rem;--space-10:2.5rem;--space-12:3rem;--radius-sm:.375rem;--radius-md:.5rem;--radius-lg:.75rem}@media (prefers-color-scheme:dark){:root{--color-page:#101820;--color-surface:#16222c;--color-surface-muted:#1e2c37;--color-surface-strong:#263844;--color-text:#edf5f9;--color-text-muted:#b3c3ce;--color-text-soft:#8ea1ae;--color-border:#314756;--color-border-strong:#486577;--color-primary:#7db9df;--color-primary-strong:#a8d4ee;--color-primary-soft:#1e3545;--color-accent:#63c5b4;--color-accent-soft:#1d3d39;--color-warning:#e8c36f;--color-warning-soft:#3b3018;--color-danger:#ee8c8c;--color-danger-soft:#432323;--color-focus:#d6eefb;--shadow-soft:0 18px 55px #0000004d;--shadow-control:0 8px 28px #0000003d}}
*{box-sizing:border-box}html{background:var(--color-page);min-width:320px;color:var(--color-text);font-family:var(--font-sans)}body{background:var(--color-page);min-height:100vh;margin:0}a{color:inherit}button,input,textarea,select{font:inherit}button{cursor:pointer}button:disabled{cursor:not-allowed;opacity:.64}:focus-visible{outline:3px solid var(--color-focus);outline-offset:2px}.app-shell{flex-direction:column;min-height:100vh;display:flex}.topbar{z-index:10;border-bottom:1px solid var(--color-border);background:color-mix(in srgb, var(--color-surface) 92%, transparent);-webkit-backdrop-filter:blur(18px);backdrop-filter:blur(18px);position:sticky;top:0}.topbar-inner{justify-content:space-between;align-items:center;gap:var(--space-4);width:min(1180px,100% - 32px);min-height:64px;margin:0 auto;display:flex}.brand-mark{align-items:center;gap:var(--space-3);color:var(--color-text);font-weight:750;text-decoration:none;display:inline-flex}.brand-symbol{border-radius:var(--radius-md);background:var(--color-primary-soft);width:34px;height:34px;color:var(--color-primary);place-items:center;display:grid}.topbar-actions{align-items:center;gap:var(--space-2);display:flex}.page{width:min(1180px,100% - 32px);padding:var(--space-8) 0 var(--space-12);margin:0 auto}.page-narrow{width:min(760px,100% - 32px);padding:var(--space-10) 0;margin:0 auto}.access-panel,.empty-panel,.loading-panel{width:min(720px,100%);margin:var(--space-10) auto 0;border:1px solid var(--color-border);border-radius:var(--radius-lg);background:var(--color-surface);box-shadow:var(--shadow-soft);padding:clamp(1.25rem,2vw,2rem)}.access-panel{gap:var(--space-4);margin-top:var(--space-8);padding:clamp(1.5rem,4vw,2.5rem);display:grid}.access-heading{align-items:center;gap:var(--space-3);display:flex}.access-icon{border-radius:var(--radius-md);border:1px solid color-mix(in srgb, var(--color-primary) 36%, var(--color-border));background:var(--color-primary-soft);width:44px;height:44px;color:var(--color-primary);place-items:center;display:grid}.access-panel h1,.empty-panel h1{margin:0 0 var(--space-3);letter-spacing:0;font-size:clamp(1.65rem,3vw,2.35rem);line-height:1.08}.access-panel p,.empty-panel p,.muted{color:var(--color-text-muted);line-height:1.6}.access-panel p{max-width:54ch;margin:0;font-size:1rem}.access-panel .button-row{margin-top:var(--space-2)}.catalog-header{justify-content:space-between;align-items:flex-end;gap:var(--space-4);margin-bottom:var(--space-6);display:flex}.catalog-header h1{margin:var(--space-2) 0 0;letter-spacing:0;font-size:clamp(2.25rem,6vw,4.5rem);line-height:.98}.catalog-grid{gap:var(--space-6);grid-template-columns:repeat(auto-fit,minmax(min(100%,300px),1fr));display:grid}.catalog-card{border:1px solid var(--color-border);border-radius:var(--radius-lg);background:var(--color-surface);min-width:0;min-height:100%;box-shadow:var(--shadow-control);color:var(--color-text);grid-template-rows:188px minmax(0,1fr);text-decoration:none;transition:border-color .16s,box-shadow .16s,transform .16s;display:grid;overflow:hidden}.catalog-card:hover{border-color:var(--color-border-strong);box-shadow:var(--shadow-soft);transform:translateY(-2px)}.catalog-card-image{background:linear-gradient(135deg, color-mix(in srgb, var(--color-primary) 22%, transparent), color-mix(in srgb, var(--color-accent) 16%, transparent)), var(--color-surface-muted);background-position:50%;background-size:cover;min-width:0;transition:transform .22s;display:block;overflow:hidden}.catalog-card:hover .catalog-card-image.has-image{transform:scale(1.03)}.catalog-card-body{gap:var(--space-3);min-width:0;padding:var(--space-5);display:grid}.catalog-card-body>.status-pill{justify-self:start}.catalog-card-title{overflow-wrap:anywhere;font-size:1.22rem;font-weight:850;line-height:1.18}.catalog-card-description{color:var(--color-text-muted);line-height:1.45}.catalog-card-progress{margin-top:var(--space-2)}.catalog-card-footer{justify-content:space-between;align-items:center;gap:var(--space-3);margin-top:var(--space-2);color:var(--color-text-muted);font-size:.92rem;display:flex}.catalog-card-action{align-items:center;gap:var(--space-2);color:var(--color-primary);white-space:nowrap;font-weight:800;display:inline-flex}.course-hero{gap:var(--space-6);margin-bottom:var(--space-8);grid-template-columns:minmax(0,1.2fr) minmax(260px,.8fr);align-items:stretch;display:grid}.course-hero-main{border:1px solid var(--color-border);border-radius:var(--radius-lg);background:var(--color-surface);min-width:0;box-shadow:var(--shadow-soft);padding:clamp(1.25rem,2.8vw,2.25rem)}.course-hero h1{margin:var(--space-2) 0 var(--space-4);letter-spacing:0;font-size:clamp(2rem,5vw,4rem);line-height:.98}.course-image{border-radius:var(--radius-lg);border:1px solid var(--color-border);background:var(--color-surface-muted);min-height:320px;overflow:hidden}.course-image.has-image{background-position:50%;background-size:cover}.eyebrow{color:var(--color-primary);letter-spacing:0;text-transform:uppercase;font-size:.8rem;font-weight:800}.progress-block{gap:var(--space-2);margin-top:var(--space-6);display:grid}.progress-row{justify-content:space-between;align-items:center;gap:var(--space-3);color:var(--color-text-muted);font-size:.95rem;display:flex}.progress-track{background:var(--color-surface-strong);border-radius:999px;height:12px;overflow:hidden}.progress-fill{border-radius:inherit;background:var(--color-accent);height:100%}.course-grid{gap:var(--space-6);grid-template-columns:minmax(260px,.35fr) minmax(0,.65fr);align-items:start;display:grid}.lesson-list,.content-panel,.admin-panel,.admin-sidebar{border:1px solid var(--color-border);border-radius:var(--radius-lg);background:var(--color-surface);box-shadow:var(--shadow-control)}.lesson-list{overflow:hidden}.panel-header{padding:var(--space-5);border-bottom:1px solid var(--color-border)}.panel-header h2,.panel-header h3{margin:0;font-size:1.05rem}.lesson-link{gap:var(--space-3);padding:var(--space-4) var(--space-5);border-bottom:1px solid var(--color-border);grid-template-columns:32px minmax(0,1fr) auto;align-items:center;text-decoration:none;display:grid}.lesson-link:last-child{border-bottom:0}.lesson-link:hover,.lesson-link[aria-current=page]{background:var(--color-primary-soft)}.lesson-index{background:var(--color-surface-muted);width:32px;height:32px;color:var(--color-text-muted);border-radius:999px;place-items:center;font-weight:800;display:grid}.lesson-title{overflow-wrap:anywhere;font-weight:700;display:block}.lesson-summary{color:var(--color-text-muted);margin-top:.15rem;font-size:.9rem;line-height:1.35;display:block}.status-pill{align-items:center;gap:var(--space-1);min-height:28px;padding:0 var(--space-3);border:1px solid var(--color-border);background:var(--color-surface-muted);color:var(--color-text-muted);white-space:nowrap;border-radius:999px;font-size:.78rem;font-weight:750;display:inline-flex}.status-pill.is-complete{border-color:color-mix(in srgb, var(--color-accent) 45%, var(--color-border));background:var(--color-accent-soft);color:var(--color-accent)}.status-pill.is-warning{border-color:color-mix(in srgb, var(--color-warning) 45%, var(--color-border));background:var(--color-warning-soft);color:var(--color-warning)}.lesson-article{padding:clamp(1.25rem,3vw,2.5rem)}.lesson-article h1{margin:0 0 var(--space-3);letter-spacing:0;font-size:clamp(2rem,4.4vw,3.6rem);line-height:1}.lesson-video-shell{margin-top:var(--space-8);border:1px solid var(--color-border);border-radius:var(--radius-lg);background:linear-gradient(135deg, color-mix(in srgb, var(--color-primary) 14%, transparent), transparent 58%), var(--color-surface-muted);aspect-ratio:16/9;position:relative;overflow:hidden}.lesson-video{z-index:1;background:0 0;width:100%;height:100%;display:block;position:relative}.lesson-video-placeholder{z-index:2;color:var(--color-primary);pointer-events:none;place-items:center;display:grid;position:absolute;inset:0}.lesson-content{margin-top:var(--space-8);color:var(--color-text);white-space:pre-wrap;font-size:1.05rem;line-height:1.75}.lesson-material{margin-top:var(--space-5)}.lesson-actions,.button-row{align-items:center;gap:var(--space-3);flex-wrap:wrap;display:flex}.lesson-actions{margin-top:var(--space-8);justify-content:space-between}.button,.icon-button{border:1px solid var(--color-border-strong);border-radius:var(--radius-md);background:var(--color-surface);min-height:42px;color:var(--color-text);justify-content:center;align-items:center;gap:var(--space-2);padding:0 var(--space-4);box-shadow:none;font-weight:800;text-decoration:none;display:inline-flex}.button.primary{border-color:var(--color-primary);background:var(--color-primary);color:var(--color-surface)}.button.danger{border-color:var(--color-danger);color:var(--color-danger)}.button:hover,.icon-button:hover{box-shadow:var(--shadow-control)}.icon-button{width:42px;padding:0}.form-grid{gap:var(--space-4);display:grid}.form-two{gap:var(--space-4);grid-template-columns:repeat(2,minmax(0,1fr));display:grid}.field{gap:var(--space-2);display:grid}.field label,.field-label{color:var(--color-text-muted);font-size:.85rem;font-weight:800}.input,.textarea,.select{border:1px solid var(--color-border-strong);border-radius:var(--radius-md);background:var(--color-surface);width:100%;min-width:0;min-height:42px;color:var(--color-text);padding:.7rem .85rem}.file-input-shell{border:1px dashed var(--color-border-strong);border-radius:var(--radius-md);background:var(--color-surface-muted);min-height:42px;color:var(--color-text);justify-content:center;align-items:center;gap:var(--space-2);cursor:pointer;padding:.7rem .85rem;display:inline-flex}.file-input-shell:hover{box-shadow:var(--shadow-control)}.sr-only-file{clip:rect(0, 0, 0, 0);width:1px;height:1px;position:absolute;overflow:hidden}.textarea{resize:vertical;min-height:126px}.message{border-radius:var(--radius-md);border:1px solid var(--color-border);background:var(--color-surface-muted);color:var(--color-text-muted);padding:var(--space-3) var(--space-4)}.message.error{border-color:color-mix(in srgb, var(--color-danger) 50%, var(--color-border));background:var(--color-danger-soft);color:var(--color-danger)}.admin-layout{gap:var(--space-6);grid-template-columns:minmax(260px,.28fr) minmax(0,.72fr);align-items:start;display:grid}.admin-sidebar{top:calc(64px + var(--space-6));position:sticky;overflow:hidden}.admin-main{gap:var(--space-6);display:grid}.admin-panel{padding:var(--space-5)}.admin-sidebar-header{gap:var(--space-4);padding:var(--space-4);border-bottom:1px solid var(--color-border);background:linear-gradient(180deg, color-mix(in srgb, var(--color-primary-soft) 68%, transparent), transparent), var(--color-surface);display:grid}.search-control{align-items:center;display:flex;position:relative}.search-control svg{color:var(--color-text-soft);pointer-events:none;position:absolute;left:.85rem}.search-control input{border:1px solid var(--color-border-strong);border-radius:var(--radius-md);background:var(--color-surface);width:100%;min-width:0;min-height:42px;color:var(--color-text);padding:.7rem .85rem .7rem 2.45rem}.search-control input::placeholder{color:var(--color-text-soft)}.sidebar-primary-action{width:100%;min-height:46px}.course-list{max-height:min(58vh,620px);display:grid;overflow-y:auto}.admin-title-row,.toolbar{justify-content:space-between;align-items:center;gap:var(--space-3);flex-wrap:wrap;display:flex}.admin-title-row{margin-bottom:var(--space-6)}.admin-title-row h1{letter-spacing:0;margin:0;font-size:clamp(1.8rem,4vw,3rem);line-height:1}.course-list-button{gap:var(--space-1);border:0;border-bottom:1px solid var(--color-border);width:100%;color:var(--color-text);padding:var(--space-4) var(--space-5);text-align:left;background:0 0;transition:background-color .16s,color .16s;display:grid}.course-list-button:hover,.course-list-button[aria-current=true]{background:var(--color-primary-soft)}.course-list-title{overflow-wrap:anywhere;font-weight:800}.course-list-meta{color:var(--color-text-muted);font-size:.86rem}.admin-empty-state{padding:var(--space-4) var(--space-5);color:var(--color-text-muted);font-size:.9rem;line-height:1.45}.tabs{gap:var(--space-1);border:1px solid var(--color-border);border-radius:var(--radius-md);background:var(--color-surface-muted);padding:var(--space-1);display:inline-flex}.tab-button{border-radius:var(--radius-sm);min-height:36px;color:var(--color-text-muted);padding:0 var(--space-3);background:0 0;border:0;font-weight:800}.tab-button[aria-selected=true]{background:var(--color-surface);color:var(--color-text);box-shadow:var(--shadow-control)}.lesson-editor{gap:var(--space-4);border:1px solid var(--color-border);border-radius:var(--radius-md);background:var(--color-surface-muted);padding:var(--space-4);display:grid}.lesson-editor+.lesson-editor{margin-top:var(--space-4)}.lesson-add-footer{margin-top:var(--space-5);padding-top:var(--space-5);border-top:1px solid var(--color-border);justify-content:flex-end;display:flex}.checkbox-row{align-items:center;gap:var(--space-2);color:var(--color-text-muted);font-weight:750;display:flex}.checkbox-row input{width:18px;height:18px;accent-color:var(--color-primary)}.settings-grid{gap:var(--space-6);grid-template-columns:minmax(0,1fr) minmax(260px,.42fr);align-items:start;display:grid}.setting-preview{border:1px solid var(--color-border);border-radius:var(--radius-md);background:var(--color-primary-soft);padding:var(--space-5)}.setting-preview h3{margin-top:0}.spin{animation:.8s linear infinite spin}@keyframes spin{to{transform:rotate(360deg)}}@media (max-width:860px){.course-hero,.course-grid,.admin-layout,.settings-grid{grid-template-columns:1fr}.admin-sidebar{position:static}.course-image{min-height:220px}.lesson-actions{align-items:stretch}.lesson-actions .button-row,.lesson-actions .button{width:100%}}@media (max-width:620px){.topbar-inner,.page,.page-narrow{width:min(100% - 24px,1180px)}.topbar-inner{min-height:58px}.brand-text{display:none}.catalog-header{flex-direction:column;align-items:flex-start}.catalog-card{grid-template-rows:164px minmax(0,1fr)}.lesson-link{grid-template-columns:30px minmax(0,1fr)}.lesson-link .status-pill{grid-column:2;justify-self:start}.admin-title-row,.toolbar{align-items:stretch}.admin-title-row>.button-row,.toolbar>.button-row,.lesson-add-footer .button{width:100%}.form-two{grid-template-columns:1fr}}