.lesson-section{background:var(--secondary-bg);border-radius:var(--border-radius);box-shadow:0 2px 8px rgba(44,62,80,.1);padding:2rem 1.5rem 1.5rem;margin-bottom:2rem;border:1px solid var(--neutral-bg,var(--primary))}.lesson-section-title{font-size:1.35rem;font-weight:700;color:var(--primary);margin-bottom:1.25rem;letter-spacing:.01em;border-radius:calc(var(--border-radius) / 2);padding:.5rem 1rem;display:inline-block;box-shadow:0 1px 4px rgba(44,62,80,.06)}:root{--white:#FFFFFF;--black:#000000;--gray100:#E1E1E1;--gray200:#C8C8C8;--gray300:#ACACAC;--gray400:#919191;--gray500:#6E6E6E;--gray600:#404040;--gray900:#212121;--gray950:#141414;--opaque50:#88FFFFFF;--skill-default:darkgray;--skill-beginner:#29618C;--skill-intermediate:#8A7328;--skill-advanced:#8A3228;--skill-pro:#298A28;--tile-background:#f2ece4;--cell-background:#88FFFFFF;--placeholder-text:#CCCCCC;--transparent-background:#00000000;--primary:#428A6B;--primary-dark:#2E5F4D;--secondary:#7397BC;--primary-bg:#F8FCFA;--secondary-bg:#F1F8F5;--tertiary-bg:#E5F2EF;--accent-bg:#CCCCCC;--card-bg:#FFFFFF;--neutral-bg:#B3B3B3;--chip-bg:#CCCCCC;--chip-fg:#404040;--btn-bg:#428A6B;--btn-fg:#fff;--btn-border:#428A6B;--btn-hover-bg:#7397BC;--btn-hover-fg:#fff;--alert:#AD1F1F;--warning:#AE8B1E;--success:#1EAE30;--header:#dcd0c0;--text-primary:#000000;--text-secondary:#333333;--text-tertiary:#666666;--text-neutral:#999999;--border-radius:8px;--font-family:"Open Sans","Segoe UI","Roboto",Arial,sans-serif;--shadow-card:0 2px 8px rgba(44,62,80,0.08);--shadow-card-hover:0 4px 16px rgba(44,62,80,0.14);--primary-focus-ring:rgba(66,138,107,0.2)}:root.theme-dark{--white:#FFFFFF;--black:#000000;--gray100:#1a1a1a;--gray200:#333333;--gray300:#4d4d4d;--gray400:#666666;--gray500:#808080;--gray600:#999999;--gray900:#b3b3b3;--gray950:#cccccc;--opaque50:#88000000;--blue300accent:#A7CBF6;--skill-default:darkgray;--skill-beginner:#29618C;--skill-intermediate:#8A7328;--skill-advanced:#8A3228;--skill-pro:#298A28;--tile-background:transparent;--cell-background:#88FFFFFF;--placeholder-text:#999999;--transparent-background:#00000000;--primary:#72BB9C;--secondary:#7397BC;--primary-bg:#030705;--secondary-bg:#050B08;--tertiary-bg:#0A0F0D;--accent-bg:#333333;--card-bg:#232634;--neutral-bg:#3E3E3E;--chip-bg:#35384a;--chip-fg:#f5f6fa;--btn-bg:#7397BC;--btn-fg:#fff;--btn-border:#72BB9C;--btn-hover-bg:#7397BC;--btn-hover-fg:#fff;--alert:#E04D4D;--warning:#E0BB4D;--success:#4DE05F;--header:#dcd0c0;--text-primary:#FFFFFF;--text-secondary:#CCCCCC;--text-tertiary:#999999;--text-neutral:#666666;--border-radius:8px;--font-family:"Open Sans","Segoe UI","Roboto",Arial,sans-serif}.store-container,body{background:var(--primary-bg);font-family:var(--font-family)}.store-title{color:var(--text-primary);font-weight:700;margin-bottom:24px;font-family:var(--font-family);font-size:2rem}.card{box-shadow:0 2px 8px rgba(44,62,80,.12);background:var(--secondary-bg)!important;border:1px solid var(--neutral-bg,var(--primary));transition:box-shadow .2s;display:flex;flex-direction:column}.card:hover{box-shadow:0 4px 16px rgba(44,62,80,.16)}.MuiCardContent-root{padding-bottom:16px!important}.MuiChip-root{background:var(--chip-bg);color:var(--chip-fg);font-weight:500}.card .MuiTypography-h6{border:none!important;background:none!important;box-shadow:none!important;font-family:var(--font-family);font-size:1.25rem;font-weight:600}.card .MuiTypography-body2{opacity:.8}.card .MuiChip-root{margin-right:.25rem;margin-bottom:.25rem}.card .MuiCardMedia-root{border-top-left-radius:var(--border-radius);border-top-right-radius:var(--border-radius)}.MuiButton-root,.maui-btn{background:var(--primary-bg)!important;font-family:var(--font-family);font-size:1rem;border-radius:var(--border-radius);padding:8px 16px;min-height:32px;min-width:44px;border:1px solid var(--btn-border);transition:background .2s,color .2s}.MuiButton-root:hover,.maui-btn:hover{background:var(--btn-hover-bg);color:var(--primary)}.MuiTypography-root,.maui-label{color:var(--text-primary);font-family:var(--font-family)}.MuiGrid-root{row-gap:16px}a{font-weight:500;color:#646cff;text-decoration:inherit}a:hover{color:#535bf2}h1{font-size:3.2em;line-height:1.1}.pnp-card{border-radius:12px;border:none;box-shadow:0 4px 8px rgba(0,0,0,.1);padding:16px;margin:16px 0;background-color:var(--card-bg)}.pnp-card:hover{box-shadow:0 8px 16px rgba(0,0,0,.15)}.pnp-card-avatar{width:48px;height:48px;border-radius:50%;margin-right:12px}.pnp-card-title{font-size:1.5em;font-weight:600;margin-bottom:8px;color:var(--text-primary)}.pnp-card-description{margin-top:12px;font-size:.9em;color:var(--text-tertiary)}.pnp-card-actions{margin-top:16px;display:flex;justify-content:flex-end;gap:8px}.pnp-card-action-button{background-color:var(--btn-bg);color:var(--btn-fg);border:1px solid var(--btn-border);border-radius:6px;padding:8px 12px;font-size:.9em;cursor:pointer;transition:background-color .2s,color .2s}.pnp-card-action-button:hover{background-color:var(--btn-hover-bg);color:var(--btn-hover-fg)}.pnp-card-custom-actions-popper{z-index:1300}.pnp-card-custom-actions-menu{background-color:var(--card-bg);border-radius:8px;box-shadow:0 4px 12px rgba(0,0,0,.1)}.action-button-destructive{color:var(--alert)!important;border:1px solid var(--alert)}.tile-button{color:var(--text-primary)!important;background-color:var(--tertiary-bg)!important;border-radius:var(--border-radius);display:flex;gap:8px;align-items:center;font-size:1rem;line-height:1.2;border:1px solid var(--primary)}.tile-button .tile-button-icon{filter:none;transition:filter .2s;color:var(--primary)}.tile-button:hover{background-color:var(--primary)!important;color:var(--white)!important;transition:background-color .2s,color .2s}.tile-button:hover .tile-button-icon{filter:brightness(0) invert(1);transition:filter .2s}