/* Excel Study Notes — PDF-only library and reader. */
#excelStudyNotesRoot {
  --sn-bg: #faf8f3;
  --sn-surface: #fff;
  --sn-surface-2: #f4f0e8;
  --sn-text: #1e293b;
  --sn-muted: #64748b;
  --sn-line: rgba(36,52,71,.13);
  --sn-primary: #1a4d2e;
  --sn-primary-2: #2f855a;
  --sn-gold: #d4af37;
  --sn-danger: #b91c1c;
  max-width: 1280px;
  margin: 0 auto;
  padding: 12px 16px 40px;
  color: var(--sn-text);
  font: 15px/1.5 "Poppins", "Segoe UI", system-ui, sans-serif;
  -webkit-font-smoothing: antialiased;
}
body.sn-lan { margin: 0; min-height: 100vh; background: var(--sn-bg); }
body.sn-public { margin: 0; min-height: 100vh; background: var(--sn-bg); }
body.dark #excelStudyNotesRoot, body.sn-lan.dark #excelStudyNotesRoot, body.sn-public.dark #excelStudyNotesRoot {
  --sn-bg: #000;
  --sn-surface: #0b1018;
  --sn-surface-2: #121a26;
  --sn-text: #eef5f0;
  --sn-muted: #94a3b8;
  --sn-line: rgba(255,255,255,.13);
  --sn-primary: #4ade80;
  --sn-primary-2: #22c55e;
  --sn-gold: #fbbf24;
  --sn-danger: #f87171;
}
body.sn-public.dark { background: #000; }
#excelStudyNotesRoot *, #excelStudyNotesRoot *::before, #excelStudyNotesRoot *::after { box-sizing: border-box; }
#excelStudyNotesRoot button, #excelStudyNotesRoot input, #excelStudyNotesRoot textarea, #excelStudyNotesRoot select { font: inherit; }
#excelStudyNotesRoot button { cursor: pointer; }
.sn-shell { min-height: 70vh; }
.sn-hero { display:flex; align-items:flex-end; justify-content:space-between; gap:18px; flex-wrap:wrap; margin-bottom:16px; padding:25px 26px; border:1px solid rgba(26,77,46,.2); border-radius:22px; background: radial-gradient(circle at 90% 0%, rgba(212,175,55,.18), transparent 35%), linear-gradient(135deg, var(--sn-surface), var(--sn-surface-2)); box-shadow: 0 16px 38px rgba(26,77,46,.1); }
.sn-hero h1 { margin:0; color:var(--sn-primary); font:800 clamp(1.65rem,4vw,2.7rem)/1.05 "Poppins",sans-serif; }
.sn-hero p { max-width:720px; margin:9px 0 0; color:var(--sn-muted); }
.sn-kicker { margin-bottom:7px; color:var(--sn-gold); font-size:.68rem; font-weight:800; letter-spacing:.14em; text-transform:uppercase; }
.sn-hero-badge { display:flex; align-items:center; gap:8px; padding:9px 12px; border:1px solid var(--sn-line); border-radius:999px; color:var(--sn-muted); background:rgba(255,255,255,.5); font-size:.75rem; font-weight:700; white-space:nowrap; }
body.dark .sn-hero-badge { background:rgba(255,255,255,.04); }
.sn-toolbar, .sn-card { border:1px solid var(--sn-line); border-radius:16px; background:var(--sn-surface); box-shadow:0 8px 24px rgba(26,77,46,.06); }
.sn-toolbar { display:grid; grid-template-columns:repeat(3,minmax(0,1fr)) auto; gap:10px; align-items:end; margin-bottom:14px; padding:14px; }
.sn-field { min-width:0; }
.sn-field label { display:block; margin-bottom:5px; color:var(--sn-muted); font-size:.68rem; font-weight:800; letter-spacing:.08em; text-transform:uppercase; }
.sn-field select, .sn-field input, .sn-field textarea { width:100%; min-height:40px; border:1px solid var(--sn-line); border-radius:9px; padding:8px 10px; color:var(--sn-text); background:var(--sn-surface-2); outline:none; }
.sn-field textarea { min-height:82px; resize:vertical; }
.sn-field select:focus, .sn-field input:focus, .sn-field textarea:focus { border-color:var(--sn-primary-2); box-shadow:0 0 0 3px rgba(34,197,94,.13); }
.sn-btn { min-height:40px; border:1px solid var(--sn-line); border-radius:9px; padding:8px 13px; color:var(--sn-text); background:var(--sn-surface-2); font-weight:700; }
.sn-btn:hover { border-color:var(--sn-primary-2); transform:translateY(-1px); }
.sn-btn.primary { border-color:transparent; color:#fff; background:linear-gradient(135deg,var(--sn-primary),var(--sn-primary-2)); }
.sn-btn.gold { border-color:transparent; color:#1f2937; background:linear-gradient(135deg,#f5d36b,var(--sn-gold)); }
.sn-btn.danger { color:var(--sn-danger); border-color:color-mix(in srgb,var(--sn-danger) 35%,transparent); }
.sn-btn.small { min-height:32px; padding:5px 9px; font-size:.76rem; }
.sn-crumbs { display:flex; align-items:center; gap:7px; flex-wrap:wrap; margin:0 0 14px; color:var(--sn-muted); font-size:.78rem; }
.sn-crumbs strong { color:var(--sn-text); }
.sn-layout { display:grid; grid-template-columns:minmax(190px, .3fr) minmax(0, 1fr); gap:14px; align-items:start; }
.sn-card { padding:15px; }
.sn-card h2, .sn-card h3 { margin:0 0 9px; color:var(--sn-text); }
.sn-card h2 { font-size:1rem; } .sn-card h3 { font-size:.9rem; }
.sn-side-list { display:grid; gap:6px; max-height:520px; overflow:auto; }
.sn-side-btn { display:flex; justify-content:space-between; gap:8px; width:100%; border:1px solid transparent; border-radius:9px; padding:9px 10px; color:var(--sn-muted); background:transparent; text-align:left; }
.sn-side-btn:hover, .sn-side-btn.active { border-color:rgba(34,197,94,.3); color:var(--sn-primary); background:rgba(34,197,94,.1); }
.sn-side-btn small { opacity:.75; }
.sn-subject-tabs { display:flex; gap:7px; flex-wrap:wrap; margin-bottom:14px; }
.sn-subject-tab { border:1px solid var(--sn-line); border-radius:999px; padding:7px 11px; color:var(--sn-muted); background:var(--sn-surface-2); font-size:.78rem; font-weight:700; }
.sn-subject-tab.active { border-color:var(--sn-primary-2); color:var(--sn-primary); background:rgba(34,197,94,.12); }
.sn-notes-grid { display:grid; grid-template-columns:repeat(auto-fill,minmax(230px,1fr)); gap:11px; }
.sn-note { display:flex; min-height:170px; flex-direction:column; justify-content:space-between; gap:12px; border:1px solid var(--sn-line); border-left:4px solid #ef4444; border-radius:13px; padding:14px; background:linear-gradient(145deg,var(--sn-surface),var(--sn-surface-2)); }
.sn-note h3 { margin:0; overflow:hidden; color:var(--sn-text); font-size:.96rem; text-overflow:ellipsis; white-space:nowrap; }
.sn-note p { margin:7px 0 0; color:var(--sn-muted); font-size:.78rem; line-height:1.5; }
.sn-note-meta { display:flex; gap:6px; flex-wrap:wrap; color:var(--sn-muted); font-size:.68rem; }
.sn-chip { display:inline-flex; align-items:center; border:1px solid var(--sn-line); border-radius:999px; padding:3px 7px; background:var(--sn-surface-2); }
.sn-empty { padding:35px 15px; color:var(--sn-muted); text-align:center; }
.sn-status { min-height:22px; margin:8px 0; color:var(--sn-muted); font-size:.8rem; }
.sn-status.error { color:var(--sn-danger); } .sn-status.success { color:var(--sn-primary); }
.sn-privacy { margin-top:14px; padding:11px 13px; border:1px solid rgba(212,175,55,.35); border-radius:12px; color:var(--sn-muted); background:rgba(212,175,55,.08); font-size:.72rem; }
.sn-admin { margin-top:16px; }
.sn-admin-head { display:flex; align-items:center; justify-content:space-between; gap:10px; flex-wrap:wrap; margin-bottom:12px; }
.sn-admin-actions { display:flex; gap:7px; flex-wrap:wrap; }
.sn-structure { display:grid; grid-template-columns:repeat(3,minmax(0,1fr)); gap:10px; }
.sn-admin-list { display:grid; gap:8px; }
.sn-admin-row { display:grid; grid-template-columns:minmax(0,1fr) auto; gap:8px; align-items:center; padding:9px; border:1px solid var(--sn-line); border-radius:10px; background:var(--sn-surface-2); }
.sn-admin-row-main { display:grid; grid-template-columns:minmax(0,1fr) 95px; gap:7px; align-items:center; }
.sn-admin-row input { min-width:0; width:100%; border:1px solid var(--sn-line); border-radius:7px; padding:7px 8px; color:var(--sn-text); background:var(--sn-surface); }
.sn-admin-row-actions { display:flex; gap:5px; flex-wrap:wrap; justify-content:flex-end; }
.sn-check { display:inline-flex; align-items:center; gap:5px; color:var(--sn-muted); font-size:.72rem; white-space:nowrap; }
.sn-upload-form { display:grid; grid-template-columns:minmax(0,1.1fr) minmax(0,1.4fr) auto; gap:8px; align-items:end; margin:12px 0; padding:11px; border:1px dashed var(--sn-line); border-radius:11px; }
.sn-upload-form input[type=file] { width:100%; color:var(--sn-muted); font-size:.74rem; }
.sn-note-admin { display:grid; grid-template-columns:minmax(0,1fr) auto; gap:8px; align-items:center; padding:9px; border:1px solid var(--sn-line); border-radius:10px; }
.sn-note-admin-main { min-width:0; display:grid; gap:5px; } .sn-note-admin-main strong { overflow:hidden; text-overflow:ellipsis; white-space:nowrap; }
.sn-note-admin-main input { min-width:0; width:100%; border:1px solid var(--sn-line); border-radius:7px; padding:7px 8px; color:var(--sn-text); background:var(--sn-surface); }
.sn-note-admin-main small { color:var(--sn-muted); font-size:.7rem; }
.sn-reader { position:fixed; inset:0; z-index:10000; display:flex; flex-direction:column; background:#0a0a0a; color:#fff; }
.sn-reader[hidden] { display:none; }
.sn-reader-bar { display:flex; align-items:center; justify-content:space-between; gap:10px; min-height:52px; padding:8px 12px; background:#101820; border-bottom:1px solid rgba(255,255,255,.16); }
.sn-reader-title { min-width:0; overflow:hidden; text-overflow:ellipsis; white-space:nowrap; font-weight:700; }
.sn-reader-actions { display:flex; gap:6px; flex-shrink:0; }
.sn-reader-actions button { min-height:34px; border:1px solid rgba(255,255,255,.22); border-radius:8px; padding:6px 10px; color:#fff; background:rgba(255,255,255,.08); font-size:.76rem; font-weight:700; }
.sn-reader-actions button:hover { background:rgba(255,255,255,.18); }
.sn-reader-stage { position:relative; flex:1; min-height:0; overflow:hidden; touch-action:pan-x pan-y pinch-zoom; }
.sn-pdf-frame { width:100%; height:100%; display:block; border:0; background:#272727; touch-action:pan-x pan-y pinch-zoom; }
.sn-reader-watermark { position:absolute; inset:0; display:grid; place-items:center; pointer-events:none; user-select:none; color:rgba(255,255,255,.12); font-size:clamp(1.1rem,3vw,2.3rem); font-weight:800; letter-spacing:.18em; text-transform:uppercase; transform:rotate(-24deg); }
.sn-reader-hint { position:absolute; left:12px; bottom:12px; pointer-events:none; color:rgba(255,255,255,.7); font-size:.68rem; }
.sn-gate { max-width:620px; margin:40px auto; padding:35px 22px; border:1px solid var(--sn-line); border-radius:18px; background:var(--sn-surface); text-align:center; }
.sn-gate h1 { margin:0 0 8px; color:var(--sn-primary); } .sn-gate p { color:var(--sn-muted); }
@media (max-width:800px) { .sn-toolbar { grid-template-columns:repeat(2,minmax(0,1fr)); } .sn-layout { grid-template-columns:1fr; } .sn-side-list { max-height:180px; grid-template-columns:repeat(auto-fill,minmax(145px,1fr)); } .sn-structure { grid-template-columns:1fr; } }
@media (max-width:540px) { #excelStudyNotesRoot { padding:8px 9px 28px; } .sn-hero { padding:20px 16px; } .sn-toolbar { grid-template-columns:1fr; } .sn-upload-form { grid-template-columns:1fr; } .sn-admin-row, .sn-note-admin { grid-template-columns:1fr; } .sn-admin-row-main { grid-template-columns:1fr; } .sn-reader-bar { min-height:48px; } .sn-reader-actions button { padding:6px 8px; } }
@media (prefers-reduced-motion:reduce) { #excelStudyNotesRoot * { scroll-behavior:auto !important; transition:none !important; animation:none !important; } }