/* GeoGebra 课件页共用样式（所有生成的课件 html 引用本文件） */
*{margin:0;padding:0;box-sizing:border-box}
body{font-family:-apple-system,"PingFang SC","Microsoft YaHei",sans-serif;background:#f5f7fb;color:#1f2937;min-height:100vh;display:flex;flex-direction:column}
/* 顶栏 */
.topbar{background:linear-gradient(135deg,#667eea 0%,#764ba2 100%);padding:12px 20px;color:#fff;display:flex;align-items:center;gap:14px}
.topbar .back{color:#fff;text-decoration:none;font-size:14px;opacity:.9;white-space:nowrap}
.topbar .back:hover{opacity:1}
.topbar h1{font-size:18px;font-weight:700;flex:1;line-height:1.3}
/* 画布区 */
.stage-wrap{flex:1;padding:14px;display:flex;flex-direction:column;gap:10px;min-height:0}
.stage{background:#fff;border-radius:14px;box-shadow:0 2px 12px rgba(31,41,55,.07);flex:1;min-height:420px;display:flex;align-items:center;justify-content:center;overflow:hidden}
.stage #ggb-host{width:100%;height:100%;display:flex;align-items:center;justify-content:center}
.tip{display:flex;align-items:center;gap:8px;font-size:13px;color:#6b7280;background:#eef2ff;border:1px solid #e0e7ff;border-radius:10px;padding:8px 14px}
.tip b{color:#4f46e5}
/* 底部说明 */
.foot{text-align:center;padding:10px 0 16px;font-size:11px;color:#94a3b8}
.foot a{color:#667eea;text-decoration:none}
.loading{color:#94a3b8;font-size:14px}