/* Academic theme: shared tokens; exercise layout, grading and tone colours stay in each engine. */
:root{--paper:#f6f7f4;--bg:#f6f7f4;--bg2:#edf2ec;--card:#fff;--card-2:#f4f7f2;--panel:#fff;--panel2:#f4f7f2;--ink:#21372e;--ink2:#40564a;--muted:#64786a;--faint:#7a8d7e;--line:#dbe4da;--accent:#23674f;--accent-ink:#fff;--accent-soft:#e7f0e7;--accent2:#586f88;--accent3:#c6d7bc;--sel:#215a44;--sel-ink:#fff;--red:#af5647;--red-deep:#934436;--gold:#9c7029;--gold-soft:#f5efde;--gold-bg:#f5efde;--jade:#267456;--jade-soft:#e7f2e8;--good:#267456;--good-bg:#e7f2e8;--bad:#b34040;--bad-bg:#fbebea;--ok:#236c4f;--ok-ink:#215f45;--ok-bg:#e7f2e8;--ok-line:#a0c5ae;--bad-line:#e1b2ab;--indigo:#52698b;--u1:#a55243;--u2:#947025;--u3:#24634b;--u4:#52698b;--u5:#7f6484;--u6:#437880;--u1s:#f7ede8;--u2s:#f6f0df;--u3s:#e7f0e7;--u4s:#eaf0f5;--u5s:#f1ebf1;--u6s:#e8f1f0;--grad:linear-gradient(120deg,#194b3c,#376448);--grad-lite:linear-gradient(120deg,#497e63,#69805d);--grad-soft:linear-gradient(120deg,#e5eee1,#f3f3e8);--shadow:0 4px 20px rgba(27,65,42,.06);--r:14px;--radius:14px}
:root[data-course-style=practice]{--accent-ink:#1c5843}
:root[data-theme=dark]{--paper:#142019;--bg:#142019;--bg2:#1b2c21;--card:#1b2c21;--card-2:#24392b;--panel:#1b2c21;--panel2:#24392b;--ink:#e7eee5;--ink2:#d0dfce;--muted:#b0c2ae;--faint:#8fa58e;--line:#38513e;--accent:#a6d6b0;--accent-ink:#173922;--accent-soft:#2b4a34;--sel:#a6d6b0;--sel-ink:#173922;--red:#ec9c8e;--red-deep:#eeac9a;--gold:#dfc080;--gold-soft:#3d3724;--gold-bg:#3d3724;--jade:#a6d6b0;--jade-soft:#244331;--good:#a6d6b0;--good-bg:#244331;--bad:#f2aca4;--bad-bg:#4b2e2b;--ok:#a6d6b0;--ok-ink:#b1debd;--ok-bg:#244331;--ok-line:#51765e;--bad-line:#85514b;--u1:#ec9c8e;--u2:#dfc080;--u3:#a6d6b0;--u4:#b0c5df;--u5:#d1b4d4;--u6:#9ac8cc;--u1s:#443129;--u2s:#3d3724;--u3s:#244331;--u4s:#2b3948;--u5s:#3b2f3e;--u6s:#243d3e;--grad-soft:linear-gradient(120deg,#263c2a,#343c28);--shadow:0 4px 18px #0002}
:root[data-theme=dark][data-course-style=practice]{--accent-ink:#b1debd}
@media(prefers-color-scheme:dark){:root:not([data-theme=light]){--paper:#142019;--bg:#142019;--bg2:#1b2c21;--card:#1b2c21;--card-2:#24392b;--panel:#1b2c21;--panel2:#24392b;--ink:#e7eee5;--ink2:#d0dfce;--muted:#b0c2ae;--line:#38513e;--accent:#a6d6b0;--accent-ink:#173922;--accent-soft:#2b4a34;--sel:#a6d6b0;--sel-ink:#173922;--good:#a6d6b0;--good-bg:#244331;--bad:#f2aca4;--bad-bg:#4b2e2b;--ok-ink:#b1debd;--grad-soft:linear-gradient(120deg,#263c2a,#343c28)}:root:not([data-theme=light])[data-course-style=practice]{--accent-ink:#b1debd}}
.course-context{font:12px/1.65 system-ui,sans-serif;background:var(--card-2);color:var(--muted);padding:10px 24px;border-bottom:1px solid var(--line);margin:0}.course-masthead{display:flex;justify-content:space-between;align-items:center;gap:18px;padding:15px max(22px,calc((100vw - 1160px)/2));background:var(--card);border-bottom:1px solid var(--line);font:12px/1.5 system-ui,sans-serif}.course-masthead a{display:flex;gap:10px;align-items:center;text-decoration:none;color:var(--ink)}.course-masthead .course-mark{display:grid;place-items:center;width:36px;height:36px;background:#20553f;color:#fff;border-radius:9px;font:25px/1 serif}.course-masthead small{display:block;color:var(--muted);font-size:9px;letter-spacing:.1em}.course-masthead strong{font-size:13px;letter-spacing:.04em}.course-stage{font-size:11px;color:var(--muted);text-align:right}.course-navigation{display:flex;flex-wrap:wrap;justify-content:center;gap:10px;padding:24px 16px calc(24px + env(safe-area-inset-bottom));background:var(--card-2);border-top:1px solid var(--line);position:relative;z-index:1}.course-navigation a{font:600 12px/1.5 system-ui,sans-serif;color:var(--ink)!important;background:var(--card);border:1px solid var(--line);border-radius:8px;padding:11px 16px;text-decoration:none!important}.course-navigation a:hover{border-color:var(--accent)}.course-navigation a:focus-visible,.course-masthead a:focus-visible{outline:3px solid #a57c3b;outline-offset:4px}.course-lesson .environment-note{padding:7px 22px;font:11px/1.6 system-ui,sans-serif;color:#725829;background:#faf5e7}.course-lesson #cloud-status{border-left:3px solid var(--accent)}.course-lesson #sync-conflicts:not(:empty){background:var(--card);border:1px solid var(--line);border-radius:12px;padding:20px;margin:20px;color:var(--ink)}.course-lesson #sync-conflicts button{padding:10px 15px;border:1px solid var(--line);background:var(--card-2);color:var(--ink);border-radius:7px;margin:5px;cursor:pointer}
@media(max-width:540px){.course-masthead{padding:12px 16px}.course-stage{max-width:110px;font-size:10px}.course-context{padding:9px 16px;font-size:11px}.course-navigation{gap:8px}.course-navigation a{font-size:11px;padding:10px 12px}}
@media(prefers-reduced-motion:reduce){.course-navigation *{transition:none!important}}