:root{--color-bg:#f6f4fb;--color-surface:#fff;--color-surface-alt:#ece7fa;--color-text:#211f3d;--color-text-muted:#6c6884;--color-primary:#3b3775;--color-primary-strong:#272457;--color-primary-contrast:#fff;--color-accent:#f6c87e;--color-lavender:#9c8ce0;--color-night:#201d45;--color-danger:#c0455c;--color-danger-bg:#fbe9ec;--color-success:#3e9c6f;--color-border:#e4e1f0;--radius-sm:10px;--radius-md:16px;--radius-lg:24px;--shadow-card:0 8px 24px #2e2c5514;--safe-top:env(safe-area-inset-top,0px);--safe-bottom:env(safe-area-inset-bottom,0px);--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light}@media 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p{margin:0}.learn-topic__source{color:var(--color-text-muted);border-top:1px solid var(--color-border);margin-top:2px;padding-top:8px;font-size:12px}.app-version{text-align:center;color:var(--color-text-muted);margin:4px 0 0;font-size:12px}dialog.sheet{border-radius:var(--radius-lg) var(--radius-lg) 0 0;background:var(--color-surface);width:100%;max-width:520px;color:var(--color-text);transition:transform .32s cubic-bezier(.32, .72, 0, 1), display .32s allow-discrete, overlay .32s allow-discrete;border:none;margin:auto auto 0;padding:0}dialog.sheet:before{content:"";background:var(--color-border);border-radius:3px;width:36px;height:5px;margin:10px auto 0;display:block}dialog.sheet[open]{transform:translateY(0)}@starting-style{dialog.sheet[open]{transform:translateY(100%)}}dialog.sheet::backdrop{transition:background-color .32s ease, display .32s allow-discrete, overlay .32s allow-discrete;background:#17162a80}@starting-style{dialog.sheet[open]::backdrop{background-color:#17162a00}}.sheet__content{padding:4px 20px calc(20px + var(--safe-bottom));flex-direction:column;gap:14px;max-height:85vh;display:flex;overflow-y:auto}.sheet__title{margin:0;font-size:18px}.sheet__message{color:var(--color-text-muted);margin:0;font-size:15px;line-height:1.5}.sheet__actions{justify-content:flex-end;gap:10px;display:flex}.sheet__actions--stack{flex-direction:column}.toast{left:50%;bottom:calc(24px + var(--safe-bottom));background:var(--color-night);color:#fff;opacity:0;pointer-events:none;text-align:center;z-index:1000;border-radius:999px;max-width:90%;padding:12px 18px;font-size:14px;transition:opacity .2s,transform .2s;position:fixed;transform:translate(-50%,20px)}.toast--error{background:var(--color-danger)}.toast--visible{opacity:1;transform:translate(-50%)}@media (width>=521px){.app-shell{border-left:1px solid var(--color-border);border-right:1px solid var(--color-border)}}