.theme-toggle{display:inline-flex;align-items:center;justify-content:center;gap:9px;min-height:42px;padding:7px 14px;border:1px solid var(--border);border-radius:24px;background:var(--surface);color:var(--text);font-size:14px;white-space:nowrap;margin-left:auto}
.theme-toggle:hover{border-color:var(--accent)}
html[data-theme="light"]{color-scheme:light;--bg:#f4f6fa;--sidebar:#fff;--surface:#fff;--border:#d8dfe9;--text:#192638;--muted:#58687e;--accent:#34691e}
[data-theme="light"] .nav-link:hover,[data-theme="light"] .lesson-row:hover{background:#edf2f7;color:var(--text)}
[data-theme="light"] .nav-link.active{background:#e8f3dd;color:#315e22}
[data-theme="light"] .nav-link .nav-num{border-color:#c8d2df}
[data-theme="light"] .small-icon{background:#e8f3dd}
[data-theme="light"] .card-visual{background:#f0f4fa;border-color:var(--border)}
[data-theme="light"] .card-visual::after{background:linear-gradient(90deg,rgba(240,244,250,.7),transparent 65%)}
[data-theme="light"] .chapter-card{box-shadow:0 4px 20px #22304b06}
[data-theme="light"] [style*="--chapter-color:#ffb681"]{--chapter-color:#a94c14!important}
[data-theme="light"] [style*="--chapter-color:#a7b8ff"]{--chapter-color:#435dc1!important}
[data-theme="light"] [style*="--chapter-color:#c5ed95"]{--chapter-color:#386b25!important}
[data-theme="light"] [style*="--chapter-color:#f3a2c9"]{--chapter-color:#a53970!important}
[data-theme="light"] [style*="color:#ffb681"]{color:#a94c14!important}
[data-theme="light"] [style*="color:#a7b8ff"]{color:#435dc1!important}
[data-theme="light"] [style*="color:#c5ed95"]{color:#386b25!important}
[data-theme="light"] [style*="color:#f3a2c9"]{color:#a53970!important}
[data-theme="light"] .lesson-count,[data-theme="light"] .banner-count,[data-theme="light"] .breadcrumbs span[aria-current]{color:var(--text)}
[data-theme="light"] .nav-label,[data-theme="light"] .side-note,[data-theme="light"] .edition,[data-theme="light"] .footer,[data-theme="light"] .book-note,[data-theme="light"] .card-bottom,[data-theme="light"] .row-slots{color:var(--muted)}
[data-theme="light"] .workspace,[data-theme="light"] .simulation-frame{background:#fff}
[data-theme="light"] .empty-simulation{background-image:radial-gradient(#c4cedc .7px,transparent .7px)}
[data-theme="light"] .sim-preview{background-color:#f0f4fa;background-image:radial-gradient(#ced7e4 1px,transparent 1px)}
[data-theme="light"] .sim-index{color:var(--muted)}
[data-theme="light"] .status-tag{background:#fff;border-color:var(--border);color:#526174}
[data-theme="light"] .primary-button{background:#34691e;color:#fff}
[data-theme="light"] .primary-button:hover{background:#254f14}
[data-theme="light"] .skip-link{background:#34691e;color:white}
[data-theme="light"] .dialog-footnote{color:var(--muted)!important}
@media(max-width:580px){.theme-toggle{padding:7px 11px;font-size:18px}.theme-toggle span{display:none}.topbar-name{font-size:9px;letter-spacing:.8px}.section-heading{align-items:flex-start}.section-heading>span{max-width:120px;text-align:right;font-size:10px}}