:root{color-scheme:light;--background:#f6f8fb;--surface:#ffffff;--surface-soft:#f1f5f9;--field-bg:#ffffff;--topbar-bg:#ffffff;--text:#121826;--muted:#64748b;--nav-text:#3d4b5d;--content-text:#526173;--heading-soft:#263449;--field-label:#405064;--button-text:#27364a;--compact-text:#334155;--line:#d9e1ec;--line-strong:#c8d2df;--blue:#1e64d4;--blue-strong:#174ea6;--green:#12a594;--green-soft:#e9f7f5;--green-text:#087568;--amber:#f59e0b;--red:#dc2626;--error-toast-bg:#b91c1c;--error-toast-border:#ef4444;--error-toast-text:#ffffff;--error-toast-shadow:rgba(127,29,29,0.26);--panel-soft:#fbfcfe;--button-hover-border:#a8b5c5;--seat-bg:#ffffff;--seat-hover-bg:#fbfdff;--seat-hover-border:#aebbcc;--seat-student-bg:#f7fbff;--seat-group-bg:#f4f9ff;--seat-blocked-bg:#eef2f7;--seat-blocked-text:#64748b;--teacher-desk-bg:#fff7ed;--teacher-desk-border:#f59e0b;--teacher-desk-text:#92400e;--focus-shadow:rgba(30,100,212,0.14);--shadow:0 18px 45px rgba(15,23,42,0.08);--topbar-shadow:0 8px 24px rgba(15,23,42,0.07)}html[data-theme=dark]{color-scheme:dark;--background:#0d1117;--surface:#151b23;--surface-soft:#1f2937;--field-bg:#111827;--topbar-bg:#111827;--text:#edf2f7;--muted:#9aa7b7;--nav-text:#c4cede;--content-text:#b5c0d0;--heading-soft:#e2e8f0;--field-label:#c8d3e2;--button-text:#e6edf7;--compact-text:#d2dbea;--line:#2d3748;--line-strong:#3d4a5f;--blue:#5b8def;--blue-strong:#7aa2ff;--green:#2dd4bf;--green-soft:#123b36;--green-text:#5eead4;--amber:#fbbf24;--red:#f87171;--error-toast-bg:#991b1b;--error-toast-border:#f87171;--error-toast-text:#ffffff;--error-toast-shadow:rgba(0,0,0,0.42);--panel-soft:#111827;--button-hover-border:#596779;--seat-bg:#151b23;--seat-hover-bg:#1b2430;--seat-hover-border:#4b5b70;--seat-student-bg:#172033;--seat-group-bg:#142336;--seat-blocked-bg:#1e293b;--seat-blocked-text:#94a3b8;--teacher-desk-bg:#332313;--teacher-desk-border:#fbbf24;--teacher-desk-text:#fde68a;--focus-shadow:rgba(91,141,239,0.22);--shadow:0 18px 45px 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