*{box-sizing:border-box;font-family:system-ui, Arial; }
body{margin:0;background:#f5f5f5;color:#222}
.topbar{display:flex;justify-content:space-between;align-items:center;padding:12px;background:#ffffff;box-shadow:0 1px 3px rgba(0,0,0,0.06)}
.topbar h1{margin:0;font-size:20px}
.grid{display:flex;flex-direction:column;gap:10px;padding:12px}
.subject-card{display:flex;justify-content:space-between;align-items:center;background:#fff;padding:12px;border-radius:10px;box-shadow:0 1px 2px rgba(0,0,0,0.04)}
.subject-card .left{display:flex;gap:10px;align-items:center}
.iconWrap{width:48px;height:48px;border-radius:6px;display:flex;align-items:center;justify-content:center;font-weight:bold}
.meta .name{font-weight:700}
.meta .level{font-size:12px;color:#666}
.fab{position:fixed;bottom:18px;left:18px;width:56px;height:56px;border-radius:50%;background:#2196f3;color:#fff;border:none;font-size:28px;box-shadow:0 6px 12px rgba(0,0,0,0.18)}
.fab.small{width:44px;height:44px;right:18px;left:auto}
.hidden{display:none}
.modal{position:fixed;inset:0;background:rgba(0,0,0,0.4);display:flex;align-items:center;justify-content:center}
.modal-content{background:#fff;padding:16px;border-radius:8px;width:90%;max-width:420px}
.icon-row{display:flex;gap:6px;flex-wrap:wrap;margin-top:6px}
.icon-row button{width:44px;height:44px;border-radius:6px;border:1px solid #eee;background:#fafafa}
.actions{display:flex;gap:8px;justify-content:flex-end;margin-top:12px}
.btn{padding:8px 12px;border-radius:6px;border:0;background:#2196f3;color:#fff;cursor:pointer}
.btn.ghost{background:transparent;color:#333;border:1px solid #ddd}
.subject-header{display:flex;align-items:center;gap:12px;padding:12px;background:#fff;box-shadow:0 1px 3px rgba(0,0,0,0.05)}
.tabs{display:flex;gap:6px;padding:8px;background:#fff}
.tab{flex:1;padding:10px;border-radius:8px;border:0;cursor:pointer}
.tab-content{padding:12px}
.note-card{display:inline-block;border-radius:8px;padding:10px;width:120px;height:120px;overflow:hidden;margin:6px;vertical-align:top}
.pdf-item,.audio-item{display:flex;align-items:center;justify-content:space-between;padding:8px;background:#fff;margin:6px;border-radius:8px}
.overlay{position:fixed;inset:0;background:rgba(0,0,0,0.85);display:flex;align-items:center;justify-content:center}
.overlay img{max-width:95%;max-height:95%}