/* v7.2.13G78C — preview + loading stability */
body.g78c-student-preview-open{overflow:hidden}
.g78c-student-preview{position:fixed;inset:0;z-index:10000;background:#f4f7f9;color:var(--ink,#172633);display:flex;flex-direction:column}
.g78c-preview-top{position:sticky;top:0;z-index:10002;display:flex;align-items:center;justify-content:space-between;gap:16px;padding:14px 18px;background:#fff;border-bottom:1px solid var(--line,#dfe5e9);box-shadow:0 4px 18px rgba(15,30,40,.08)}
.g78c-preview-top>div{display:grid;gap:2px;min-width:0}.g78c-preview-top strong{font-size:1.05rem;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.g78c-preview-top small{color:var(--muted,#64748b)}.g78c-preview-label{font-size:.62rem;font-weight:900;letter-spacing:.12em;color:#17648e}
.g78c-preview-layout{min-height:0;flex:1;display:grid;grid-template-columns:220px minmax(0,1fr);overflow:hidden}
.g78c-preview-nav{background:#17384d;padding:14px 10px;overflow:auto;display:flex;flex-direction:column;gap:5px}.g78c-preview-nav button{border:0;background:transparent;color:#dbe7ed;text-align:left;padding:10px 12px;border-radius:9px;font-weight:800;cursor:pointer}.g78c-preview-nav button:hover,.g78c-preview-nav button.active{background:#fff;color:#17384d}
.g78c-preview-main{overflow:auto;padding:18px;overscroll-behavior:contain}.g78c-preview-info{margin-bottom:14px}.g78c-preview-kpis{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:10px;margin-bottom:14px}.g78c-preview-kpis>div{background:#fff;border:1px solid var(--line,#dfe5e9);border-radius:13px;padding:13px}.g78c-preview-kpis span,.g78c-preview-kpis strong{display:block}.g78c-preview-kpis span{font-size:.68rem;color:var(--muted,#64748b);text-transform:uppercase;font-weight:900;letter-spacing:.04em}.g78c-preview-kpis strong{font-size:1.25rem;margin-top:4px}
.g78c-two{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.g78c-card{background:#fff;border:1px solid var(--line,#dfe5e9);border-radius:14px;padding:15px;margin-bottom:12px}.g78c-card h3{margin:0 0 10px;color:#17384d}.g78c-row{display:grid;gap:3px;padding:9px 0;border-bottom:1px solid #edf1f3}.g78c-row:last-child{border-bottom:0}.g78c-row strong{font-size:.86rem}.g78c-row span{font-size:.76rem;color:var(--muted,#64748b);line-height:1.4}.g78c-details{display:grid;grid-template-columns:150px 1fr;gap:9px 14px}.g78c-details dt{color:var(--muted,#64748b);font-weight:800}.g78c-details dd{margin:0;font-weight:700}.g78c-safe-note{margin-top:14px}
.g78c-users-loading{min-height:360px;display:grid;place-items:center;align-content:center;gap:10px;text-align:center;padding:30px;color:var(--muted,#64748b)}.g78c-users-loading strong{color:var(--ink,#172633);font-size:1.05rem}.g78c-spinner{width:30px;height:30px;border:3px solid #d9e3e8;border-top-color:#17648e;border-radius:50%;animation:g78cspin .8s linear infinite}@keyframes g78cspin{to{transform:rotate(360deg)}}
@media(max-width:760px){.g78c-preview-top{align-items:flex-start}.g78c-preview-top .btn{flex:0 0 auto}.g78c-preview-layout{grid-template-columns:1fr;grid-template-rows:auto minmax(0,1fr)}.g78c-preview-nav{flex-direction:row;overflow-x:auto;padding:8px;white-space:nowrap}.g78c-preview-nav button{flex:0 0 auto}.g78c-preview-main{padding:12px}.g78c-two{grid-template-columns:1fr}.g78c-details{grid-template-columns:1fr}.g78c-details dt{margin-top:5px}}
@media(max-width:480px){.g78c-preview-top{padding:10px;gap:8px}.g78c-preview-top .btn{font-size:.72rem;padding:8px}.g78c-preview-top small{display:none}}