/* Chat-Widget der Lernseite: Theme-Tokens hell/dunkel, Bottom-Sheet am Handy, Karte am Desktop */
:root{--mc-bg:#ffffff;--mc-ink:#1f2328;--mc-muted:#5d6670;--mc-line:#d9d6cf;--mc-soft:#f1efe9;--mc-accent:#0b7285;--mc-on:#ffffff;--mc-user:#dcebf5;--mc-shadow:0 8px 30px rgba(0,0,0,.18)}
@media (prefers-color-scheme: dark){:root:not([data-theme="light"]){--mc-bg:#1e2126;--mc-ink:#e8e6e1;--mc-muted:#aab1b9;--mc-line:#363b43;--mc-soft:#272b31;--mc-accent:#3bc9db;--mc-on:#15171a;--mc-user:#2b4b63;--mc-shadow:0 8px 30px rgba(0,0,0,.6)}}
:root[data-theme="dark"]{--mc-bg:#1e2126;--mc-ink:#e8e6e1;--mc-muted:#aab1b9;--mc-line:#363b43;--mc-soft:#272b31;--mc-accent:#3bc9db;--mc-on:#15171a;--mc-user:#2b4b63;--mc-shadow:0 8px 30px rgba(0,0,0,.6)}
body{padding-bottom:84px}
#mc-open{position:fixed;right:16px;bottom:calc(16px + env(safe-area-inset-bottom,0px));z-index:60;display:flex;align-items:center;gap:8px;padding:12px 16px;border-radius:999px;border:0;background:var(--mc-accent);color:var(--mc-on);font:600 15px/1 -apple-system,'Segoe UI',Helvetica,Arial,sans-serif;box-shadow:var(--mc-shadow);cursor:pointer}
#mc-open svg{width:18px;height:18px;fill:none;stroke:currentColor;stroke-width:2}
#mc-panel{position:fixed;right:16px;bottom:16px;z-index:61;width:min(420px,calc(100vw - 32px));height:min(600px,calc(100vh - 32px));display:none;flex-direction:column;background:var(--mc-bg);color:var(--mc-ink);border:1px solid var(--mc-line);border-radius:14px;box-shadow:var(--mc-shadow);font:15px/1.5 -apple-system,'Segoe UI',Helvetica,Arial,sans-serif;overflow:hidden}
#mc-panel.open{display:flex}
@media(max-width:640px){#mc-panel{right:0;bottom:0;width:100vw;height:min(88vh,calc(100vh - 40px));border-radius:14px 14px 0 0;padding-bottom:env(safe-area-inset-bottom,0px)}}
.mc-head{display:flex;align-items:center;gap:8px;padding:10px 12px;border-bottom:1px solid var(--mc-line);background:var(--mc-soft)}
.mc-head strong{flex:1;font-size:15px}.mc-head small{color:var(--mc-muted);font-size:12px}
.mc-head button{border:1px solid var(--mc-line);background:var(--mc-bg);color:var(--mc-ink);border-radius:8px;padding:6px 10px;cursor:pointer;font-size:13px}
.mc-log{flex:1;overflow-y:auto;padding:12px;display:flex;flex-direction:column;gap:10px;overscroll-behavior:contain}
.mc-msg{max-width:92%;padding:8px 12px;border-radius:12px;white-space:pre-wrap;overflow-wrap:anywhere}
.mc-msg.user{align-self:flex-end;background:var(--mc-user);border-bottom-right-radius:4px}
.mc-msg.bot{align-self:flex-start;background:var(--mc-soft);border-bottom-left-radius:4px}
.mc-msg.err{align-self:stretch;background:#fff3bf;color:#5c3d00;border:1px solid #f1d27a}
.mc-msg code{background:rgba(127,127,127,.18);padding:1px 4px;border-radius:3px;font-size:.92em}
.mc-msg .katex-display{overflow-x:auto;margin:.4em 0}
.mc-hint{color:var(--mc-muted);font-size:13px}
.mc-form{display:flex;gap:8px;padding:10px 12px;border-top:1px solid var(--mc-line);background:var(--mc-bg)}
.mc-form textarea{flex:1;resize:none;min-height:44px;max-height:120px;padding:10px;border:1px solid var(--mc-line);border-radius:10px;background:var(--mc-bg);color:var(--mc-ink);font:inherit}
.mc-form button{border:0;border-radius:10px;padding:0 14px;background:var(--mc-accent);color:var(--mc-on);font:600 14px/1 inherit;cursor:pointer}
.mc-form button:disabled{opacity:.5;cursor:default}
.mc-wait{display:inline-block;width:1.2em;overflow:hidden;vertical-align:bottom;animation:mc-dots 1.2s steps(4,end) infinite}
@keyframes mc-dots{to{width:0}}