*{box-sizing:border-box}
:root{
  --green:#4CAF50; --blue:#2196F3; --red:#F44336; --yellow:#FFC107;
  --bg:#fafafa; --surface:#ffffff; --text:#111; --muted:#666;
  --shadow:0 6px 20px rgba(0,0,0,.08);
}
html,body{height:100%}
body{margin:0;font-family:system-ui,'Segoe UI',Tahoma,Arial; background:var(--bg); color:var(--text);}

.app-bar{position:sticky;top:0;background:var(--surface);display:flex;align-items:center;gap:8px;padding:10px 12px;border-bottom:1px solid #eee;z-index:5}
.app-bar h1{margin:0;font-size:20px;flex:1;text-align:center}
.icon-btn{border:none;background:transparent;font-size:20px;padding:6px 10px;border-radius:12px;cursor:pointer}
.icon-btn:hover{background:#f2f2f2}

.tabs{position:sticky;top:56px;display:flex;gap:6px;padding:8px;background:var(--surface);border-bottom:1px solid #eee;z-index:4}
.tab{flex:1;border:none;padding:10px;border-radius:14px;cursor:pointer;box-shadow:var(--shadow);background:#fff}
.tab-notes{background: #e8f5e9;}
.tab-pdfs{background: #e3f2fd;}
.tab-images{background: #ffebee;}
.tab-audio{background: #fff8e1;}

.hidden{display:none !important}

main{padding:14px;}

.fab{position:fixed;bottom:18px;right:18px;width:56px;height:56px;border-radius:50%;border:none;background:var(--green);color:#fff;font-size:28px;box-shadow:var(--shadow);cursor:pointer;z-index:6}
.pwa-btn{position:fixed;bottom:86px;right:18px;border:none;padding:10px 14px;border-radius:12px;background:#111;color:#fff;box-shadow:var(--shadow);}

.card{background:var(--surface);border-radius:16px;box-shadow:var(--shadow);padding:12px;margin:10px 0;display:flex;align-items:center;gap:10px}
.card .meta{flex:1}
.badge{padding:2px 8px;border-radius:999px;font-size:12px;border:1px solid #00000014}

.subject{cursor:pointer;border-right:8px solid var(--green)}
.subject .icon{font-size:26px;width:36px;height:36px;display:flex;align-items:center;justify-content:center;border-radius:12px;background:#f7f7f7}
.subject .title{font-weight:700}
.subject .row{display:flex;gap:8px;align-items:center}

.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(160px,1fr));gap:12px}
.note-tile{background:#e8f5e9;border-radius:16px;padding:10px;cursor:pointer;box-shadow:var(--shadow)}
.note-tile h4{margin:0 0 6px 0}
.tile{background:#fff;border-radius:16px;padding:12px;box-shadow:var(--shadow);cursor:pointer}
.tile-row{display:flex;align-items:center;gap:8px}
.pdf{background:#e3f2fd}
.album{background:#ffebee;border-right:8px solid var(--red)}
.audio{background:#fff8e1}

.dialog{max-width:520px;border:none;border-radius:18px;box-shadow:var(--shadow);padding:0}
.dialog::backdrop{background:rgba(0,0,0,.25)}
.form{padding:16px 18px}
.form h2{margin-top:0}
.form label{display:block;margin:10px 0}
.form input[type=text], .form textarea, .form input[type=color]{width:100%;padding:10px;border:1px solid #ddd;border-radius:12px}
.dialog-actions{display:flex;gap:10px;justify-content:flex-end;margin-top:12px}
.btn{padding:10px 14px;border:none;border-radius:12px;cursor:pointer}
.btn.primary{background:var(--green);color:#fff}
.btn.ghost{background:#f2f2f2}
.btn.danger{background:var(--red);color:#fff}

.icon-grid, .level-grid{display:grid;grid-template-columns:repeat(8,1fr);gap:8px}
.icon-option, .level-option{border:1px solid #ddd;border-radius:12px;padding:8px;text-align:center;cursor:pointer;user-select:none}
.option-selected{outline:3px solid #111}

.album-header{display:flex;align-items:center;gap:8px;margin:10px 0}
.image-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(110px,1fr));gap:8px}
.image-grid img{width:100%;height:110px;object-fit:cover;border-radius:12px;box-shadow:var(--shadow);cursor:pointer}

.fullscreen{position:fixed;inset:0;background:rgba(0,0,0,.9);display:flex;align-items:center;justify-content:center;z-index:999}
.fullscreen img{max-width:95%;max-height:95%;border-radius:12px}

.kv{display:flex;gap:8px;align-items:center}
.small{font-size:12px;color:var(--muted)}