:root{--app-surface:var(--paper);--app-surface-muted:var(--paper-dark);--app-surface-card:#fff;--app-surface-raised:#fff;--app-surface-overlay:#1e2b2266;--app-text:var(--ink);--app-text-secondary:var(--ink-light);--app-text-muted:var(--ink-muted);--app-accent:var(--brass);--app-accent-light:var(--brass-light);--app-accent-dark:var(--brass-dark);--app-border:var(--border);--app-border-dark:var(--border-dark);--paper-card:var(--app-surface-card);--surface-raised:var(--app-surface-raised);--surface-overlay:var(--app-surface-overlay);--state-success:#2d6a4f;--state-success-bg:#2d6a4f14;--state-success-border:#2d6a4f40;--state-warning:var(--brass-dark);--state-warning-bg:#a87f3f14;--state-warning-border:#a87f3f40;--state-danger:var(--stamp-red);--state-danger-bg:#b84a3e14;--state-danger-border:#b84a3e40;--state-info:#2b5c70;--state-info-bg:#2b5c7014;--state-info-border:#2b5c7040;--sidebar-width:260px;--app-max-width:1360px;--learning-max-width:1440px;--content-narrow:820px;--topbar-height:64px;--bottom-nav-height:64px}html[data-theme=dark]{--app-surface:var(--paper);--app-surface-muted:var(--paper-dark);--app-surface-card:#202723;--app-surface-raised:#28312c;--app-surface-overlay:#000000a6;--paper-card:var(--app-surface-card);--surface-raised:var(--app-surface-raised);--surface-overlay:var(--app-surface-overlay);--state-success:#68d391;--state-success-bg:#68d3911f;--state-success-border:#68d3914d;--state-warning:var(--brass-light);--state-warning-bg:#c49b5e1f;--state-warning-border:#c49b5e4d;--state-danger:var(--stamp-red);--state-danger-bg:#d4625a24;--state-danger-border:#d4625a4d;--state-info:#63b3ed;--state-info-bg:#63b3ed1f;--state-info-border:#63b3ed4d}
.app-btn{font-family:var(--font-sans);cursor:pointer;white-space:nowrap;border:1px solid #0000;border-radius:4px;justify-content:center;align-items:center;gap:.5rem;padding:.55rem 1.1rem;font-size:.9375rem;font-weight:500;line-height:1.4;text-decoration:none;transition:background-color .15s,border-color .15s,color .15s;display:inline-flex}.app-btn:focus-visible{outline:3px solid var(--stamp-red);outline-offset:2px}.app-btn:disabled,.app-btn[aria-disabled=true]{opacity:.5;cursor:not-allowed;pointer-events:none}.app-btn-primary{background-color:var(--ink);color:var(--paper);border-color:var(--ink)}.app-btn-primary:hover{background-color:var(--brass-dark);border-color:var(--brass-dark);color:var(--paper)}.app-btn-secondary{background-color:var(--paper-card);color:var(--ink);border-color:var(--border-dark)}.app-btn-secondary:hover{background-color:var(--paper-dark);border-color:var(--ink-light)}.app-btn-outline{background-color:var(--paper-card);color:var(--ink-light);border-color:var(--border)}.app-btn-outline:hover{background-color:var(--paper-card);border-color:var(--brass);color:var(--ink)}.app-btn-ghost{color:var(--ink-light);background-color:#0000;border-color:#0000}.app-btn-ghost:hover{background-color:var(--paper-dark);color:var(--ink)}.app-btn-sm{padding:.35rem .75rem;font-size:.8125rem}.app-btn-icon{border-radius:4px;justify-content:center;align-items:center;padding:.45rem;display:inline-flex}.app-badge{font-family:var(--font-mono);border:1px solid var(--border);background-color:var(--paper-dark);color:var(--ink-light);text-transform:uppercase;letter-spacing:.03em;white-space:nowrap;border-radius:3px;align-items:center;gap:.3rem;padding:.18rem .5rem;font-size:.75rem;font-weight:500;display:inline-flex}.app-badge-free{background-color:var(--state-success-bg);color:var(--state-success);border-color:var(--state-success-border)}.app-badge-paid{color:var(--brass-dark);background-color:#a87f3f14;border-color:#a87f3f40}html[data-theme=dark] .app-badge-paid{color:var(--brass-light);background-color:#c49b5e26;border-color:#c49b5e4d}.app-badge-invite{background-color:var(--state-info-bg);color:var(--state-info);border-color:var(--state-info-border)}.app-badge-success{background-color:var(--state-success-bg);color:var(--state-success);border-color:var(--state-success-border)}.app-badge-warning{background-color:var(--state-warning-bg);color:var(--state-warning);border-color:var(--state-warning-border)}.app-badge-danger{background-color:var(--state-danger-bg);color:var(--state-danger);border-color:var(--state-danger-border)}.app-badge-draft{background-color:var(--paper-dark);color:var(--ink-muted);border-color:var(--border-dark)}.app-progress-wrap{flex-direction:column;gap:.35rem;width:100%;display:flex}.app-progress-meta{font-family:var(--font-mono);color:var(--ink-muted);justify-content:space-between;align-items:center;font-size:.75rem;display:flex}.app-progress-track{background-color:var(--border);border-radius:3px;width:100%;height:6px;overflow:hidden}.app-progress-fill{background-color:var(--brass);border-radius:3px;height:100%;transition:width .3s}.app-progress-fill.is-completed{background-color:var(--state-success)}.app-tabs-nav{border-bottom:1px solid var(--border);gap:.5rem;margin-bottom:1.5rem;display:flex;overflow-x:auto}.app-tab-btn{font-family:var(--font-sans);color:var(--ink-light);cursor:pointer;white-space:nowrap;background:0 0;border:none;border-bottom:2px solid #0000;margin-bottom:-1px;padding:.65rem .85rem;font-size:.9375rem;transition:color .15s,border-color .15s}.app-tab-btn:hover{color:var(--ink)}.app-tab-btn.is-active{color:var(--ink);border-bottom-color:var(--brass);font-weight:600}.app-tab-btn:focus-visible{outline:3px solid var(--stamp-red);outline-offset:2px}.app-empty-state{text-align:center;border:1px dashed var(--border);background-color:var(--paper-card);border-radius:6px;flex-direction:column;justify-content:center;align-items:center;padding:3rem 1.5rem;display:flex}.app-empty-icon{width:44px;height:44px;color:var(--ink-muted);margin-bottom:1rem}.app-empty-title{font-family:var(--font-sans);color:var(--ink);margin-bottom:.4rem;font-size:1.125rem;font-weight:600}.app-empty-desc{font-family:var(--font-sans);color:var(--ink-muted);max-width:420px;margin-bottom:1.25rem;font-size:.9375rem;line-height:1.6}.app-access-denied{text-align:center;border:1px solid var(--border);background-color:var(--paper-card);border-radius:6px;flex-direction:column;justify-content:center;align-items:center;max-width:560px;margin:2rem auto;padding:3.5rem 2rem;display:flex}.app-access-badge{margin-bottom:1rem}.app-access-title{font-family:var(--font-serif);color:var(--ink);margin-bottom:.75rem;font-size:1.5rem;font-weight:600;line-height:1.3}.app-access-message{font-family:var(--font-sans);color:var(--ink-light);margin-bottom:1.5rem;font-size:1rem;line-height:1.6}.app-access-actions{flex-wrap:wrap;justify-content:center;gap:.75rem;display:flex}.app-skeleton{background-color:var(--border);border-radius:4px;position:relative;overflow:hidden}.app-skeleton:after{content:"";background-image:linear-gradient(90deg,#fff0 0,#fff3 20%,#ffffff80 60%,#fff0);animation:2s infinite shimmer;position:absolute;inset:0;transform:translate(-100%)}html[data-theme=dark] .app-skeleton:after{background-image:linear-gradient(90deg,#fff0 0,#ffffff0d 20%,#ffffff1a 60%,#fff0)}@keyframes 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.15s}.catalog-tab-btn.is-active{background:var(--paper-card);color:var(--ink);border-color:var(--border-dark);font-weight:600;box-shadow:0 1px 2px #0000000a}.catalog-tab-btn:hover:not(.is-active){background:var(--paper-dark);color:var(--ink)}.catalog-filter-card{background:var(--paper-card);border:1px solid var(--border);border-radius:12px;margin-bottom:2rem;padding:1.25rem 1.5rem;box-shadow:0 2px 8px #00000005}.catalog-filter-heading{font-family:var(--font-sans);color:var(--ink);margin:0 0 1rem;font-size:1rem;font-weight:600}.catalog-filter-grid{grid-template-columns:2fr 1fr 1fr 1fr auto;align-items:center;gap:.75rem;display:grid}@media (max-width:960px){.catalog-filter-grid{grid-template-columns:1fr 1fr}.catalog-search-field,.catalog-submit-field{grid-column:span 2}}@media 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#0003}.catalog-badge-icon{fill:currentColor;width:12px;height:12px}.catalog-card-body{flex-direction:column;flex:1;padding:1.25rem;display:flex}.catalog-card-tags{flex-wrap:wrap;gap:.4rem;margin-bottom:.65rem;display:flex}.catalog-tag-pill{font-family:var(--font-mono);color:var(--ink-light);background:var(--paper-dark);border:1px solid var(--border);border-radius:4px;padding:.15rem .5rem;font-size:.75rem;font-weight:500}.catalog-card-title{font-family:var(--font-serif);margin:0 0 .5rem;font-size:1.125rem;font-weight:600;line-height:1.35}.catalog-card-title-link{color:var(--ink);text-decoration:none;transition:color .15s}.catalog-card-title-link:hover{color:var(--brass-dark);text-decoration:underline}.catalog-card-desc{color:var(--ink-muted);-webkit-line-clamp:2;-webkit-box-orient:vertical;margin:0 0 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