/* ── reset ──────────────────────────────────────────────── */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
  /* ── clean white + forest-green palette (matches elearn reference) */
  --bg:#F8FAFC;--bg2:#FFFFFF;--bg3:#F1F5F9;--bg4:#E2E8F0;
  --border:#E2E8F0;--border2:#CBD5E1;
  --text:#0F172A;--text2:#64748B;--text3:#94A3B8;
  --accent:#065F46;--accent2:#059669;--accent-glow:rgba(5,150,105,.1);
  --green:#059669;--green2:rgba(5,150,105,.1);
  --red:#DC2626;--red2:rgba(220,38,38,.08);
  --yellow:#D97706;--yellow2:rgba(217,119,6,.1);
  --blue:#2563EB;--blue2:rgba(37,99,235,.1);
  --r:10px;--r-lg:14px;
  --shadow:0 1px 4px rgba(0,0,0,.07),0 4px 16px rgba(0,0,0,.06);
  --shadow-lg:0 8px 32px rgba(0,0,0,.12);
  /* footer */
  --footer-bg:#0F172A;--footer-mid:#1E293B;--footer-text:#94A3B8;
}
/* ── GitHub Dark theme ───────────────────────────────────── */
[data-theme="dark"]{
  --bg:#0d1117;--bg2:#161b22;--bg3:#1c2128;--bg4:#262c36;
  --border:#21262d;--border2:#30363d;
  --text:#e6edf3;--text2:#8b949e;--text3:#484f58;
  --accent:#3fb950;--accent2:#2ea043;--accent-glow:rgba(63,185,80,.14);
  --green:#3fb950;--green2:rgba(63,185,80,.12);
  --red:#f85149;--red2:rgba(248,81,73,.12);
  --yellow:#e3b341;--yellow2:rgba(227,179,65,.12);
  --blue:#58a6ff;--blue2:rgba(88,166,255,.12);
  --shadow:0 2px 8px rgba(0,0,0,.6);--shadow-lg:0 8px 32px rgba(0,0,0,.7);
}
html{height:100%;scroll-behavior:smooth}
body{font-family:'Inter','Noto Sans Ethiopic',sans-serif;background:var(--bg);color:var(--text);height:100%;font-size:15px;line-height:1.6;overflow:hidden}
button{cursor:pointer;font-family:inherit}
input,select,textarea{font-family:inherit}
::-webkit-scrollbar{width:5px;height:5px}
::-webkit-scrollbar-track{background:var(--bg)}
::-webkit-scrollbar-thumb{background:var(--bg4);border-radius:3px}

/* ── layout ─────────────────────────────────────────────── */
.shell{display:grid;grid-template-columns:260px 1fr;grid-template-rows:60px 1fr;height:100vh;overflow:hidden;transition:grid-template-columns .25s ease}
.shell.sidebar-collapsed{grid-template-columns:0px 1fr}

/* ── topbar ─────────────────────────────────────────────── */
.topbar{
  grid-column:1/-1;background:var(--bg2);
  border-bottom:1px solid var(--border);
  display:flex;align-items:center;justify-content:space-between;
  padding:0 16px;gap:6px;
  position:sticky;top:0;z-index:200;
}
.brand{display:flex;align-items:center;gap:10px;font-weight:700;font-size:16px;white-space:nowrap}
.brand-mark{
  width:34px;height:34px;border-radius:10px;
  background:linear-gradient(135deg,var(--accent),#a78bfa);
  display:flex;align-items:center;justify-content:center;
  font-size:17px;flex-shrink:0;
}
.topbar-center{flex:1;max-width:280px}
.search-wrap{position:relative}
.search-wrap input{
  width:100%;background:var(--bg3);border:1px solid var(--border);
  border-radius:var(--r);padding:8px 14px 8px 36px;
  color:var(--text);font-size:13px;outline:none;transition:border-color .2s;
}
.search-wrap input:focus{border-color:var(--accent)}
.search-ico{position:absolute;left:11px;top:50%;transform:translateY(-50%);color:var(--text3)}
.topbar-right{display:flex;align-items:center;gap:6px}
.stat-chip{
  display:flex;align-items:center;gap:6px;font-size:12px;
  color:var(--text2);padding:5px 10px;border-radius:20px;
  background:var(--bg3);border:1px solid var(--border);
}
.stat-chip b{color:var(--accent)}
.nav-btn{
  width:36px;height:36px;border-radius:var(--r);
  background:var(--bg3);border:1px solid var(--border);
  color:var(--text2);display:flex;align-items:center;justify-content:center;
  transition:all .15s;position:relative;
}
.nav-btn:hover{background:var(--bg4);color:var(--text);border-color:var(--border2)}
.nav-btn.active{background:var(--accent-glow);border-color:var(--accent);color:var(--accent)}
.badge-dot{
  position:absolute;top:6px;right:6px;width:7px;height:7px;
  border-radius:50%;background:var(--accent);border:2px solid var(--bg2);
}

/* ── sidebar ─────────────────────────────────────────────── */
.sidebar{
  background:var(--bg2);border-right:1px solid var(--border);
  height:100%;position:sticky;top:0;
  display:flex;flex-direction:column;overflow:hidden;
  transition:transform .25s ease,opacity .25s ease;
}
.shell.sidebar-collapsed .sidebar{transform:translateX(-100%);opacity:0;pointer-events:none}
/* guest (not logged in): hide sidebar, full-width main */
.shell.guest{grid-template-columns:0px 1fr}
.shell.guest .sidebar{transform:translateX(-100%);opacity:0;pointer-events:none;width:0}
.shell.guest #btnSidebar,.shell.guest #btnSidebarTop{display:none!important}
.hamburger-btn{
  width:36px;height:36px;border-radius:8px;
  background:none;border:none;
  color:var(--text2);display:flex;align-items:center;justify-content:center;
  cursor:pointer;transition:all .15s;flex-shrink:0;
  margin-left:-8px;
}
.hamburger-btn:hover{background:var(--bg3);color:var(--text)}
.sidebar-head{flex-shrink:0;padding:16px 0 6px}
.sidebar-scroll{flex:1;min-height:0;overflow-y:auto}
.sidebar-foot{flex-shrink:0;padding-bottom:4px}
.sidebar-sec{margin-bottom:8px}
.sidebar-lbl{
  font-size:10px;font-weight:700;letter-spacing:.1em;text-transform:uppercase;
  color:var(--text3);padding:0 16px 8px;
}
.sidebar-lbl-sub{
  padding-top:4px;color:var(--accent2);letter-spacing:.08em;
}
.dept-item{
  display:flex;align-items:center;gap:10px;
  padding:0 8px 0 16px;cursor:pointer;
  border-left:3px solid transparent;
  transition:all .15s;
}
.dept-item:hover{background:var(--bg3)}
.dept-item.active{background:var(--bg3);border-left-color:var(--accent)}
.dept-btn{
  display:flex;align-items:center;gap:10px;flex:1;min-width:0;
  padding:10px 0;
}
.dept-emoji{font-size:20px;flex-shrink:0;width:28px;text-align:center}
.dept-info{flex:1;min-width:0}
.dept-name{font-size:13px;font-weight:500;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.dept-meta{font-size:11px;color:var(--text3)}
.dept-count{
  font-size:11px;font-weight:600;padding:2px 7px;border-radius:20px;
  background:var(--bg4);color:var(--text3);flex-shrink:0;
}
.dept-item.active .dept-count{background:var(--accent-glow);color:var(--accent)}
.dept-chevron{
  flex-shrink:0;width:18px;height:18px;
  display:flex;align-items:center;justify-content:center;
  color:var(--text3);transition:transform .22s;
}
.dept-item.open .dept-chevron{transform:rotate(90deg)}
.dept-item.active .dept-chevron{color:var(--accent)}

/* ── premium sidebar btn ─────────────────────────────────── */
.prem-sidebar-btn{
  display:flex;align-items:center;gap:10px;
  width:calc(100% - 24px);margin:0 12px;
  padding:11px 14px;border-radius:var(--r);
  background:linear-gradient(135deg,rgba(217,119,6,.15),rgba(240,180,41,.08));
  border:1px solid rgba(217,119,6,.35);
  color:var(--yellow);font-size:13px;font-weight:600;cursor:pointer;
  transition:all .18s;text-align:left;
}
.prem-sidebar-btn:hover{
  background:linear-gradient(135deg,rgba(217,119,6,.25),rgba(240,180,41,.15));
  border-color:var(--yellow);
  box-shadow:0 2px 12px rgba(217,119,6,.2);
}
.prem-sidebar-btn .prem-icon{font-size:18px}
.prem-sidebar-btn .prem-text{flex:1;min-width:0}
.prem-sidebar-btn .prem-title{display:block;font-size:13px;font-weight:600}
.prem-sidebar-btn .prem-sub{display:block;font-size:10px;font-weight:400;opacity:.75;margin-top:1px}

.cat-list{padding:0 0 6px 44px;display:none}
.cat-list.open{display:block}
.cat-item{
  padding:6px 16px;font-size:12px;color:var(--text2);
  cursor:pointer;border-radius:6px;transition:all .15s;
  display:flex;align-items:center;justify-content:space-between;
}
.cat-item:hover{background:var(--bg3);color:var(--text)}
.cat-item.active{background:var(--accent-glow);color:var(--accent)}
.cat-q{font-size:11px;color:var(--text3)}

.sidebar-divider{height:1px;background:var(--border);margin:12px 16px}

.quiz-mode-btns{padding:0 12px;display:flex;flex-direction:column;gap:6px}
.mode-btn{
  display:flex;align-items:center;gap:10px;padding:10px 12px;
  border-radius:var(--r);border:1px solid var(--border);
  background:transparent;color:var(--text2);font-size:13px;font-weight:500;
  transition:all .15s;text-align:left;width:100%;
}
.mode-btn:hover{background:var(--bg3);color:var(--text);border-color:var(--border2)}
.mode-btn.active{background:var(--accent-glow);border-color:var(--accent);color:var(--accent)}
.mode-icon{font-size:16px;width:24px;text-align:center}

/* ── main ───────────────────────────────────────────────── */
.main{overflow-y:auto;display:flex;flex-direction:column;height:100%}

/* ── views ──────────────────────────────────────────────── */
.view{display:none}
.view.active{display:block}

/* ── home / welcome ─────────────────────────────────────── */
.stat-card{
  background:var(--bg2);border:1px solid var(--border);border-radius:var(--r-lg);
  padding:12px 18px;text-align:center;min-width:100px;
}
.stat-card .val{font-size:22px;font-weight:700;color:var(--accent)}
.stat-card .lbl{font-size:11px;color:var(--text2);margin-top:2px}

/* ── home dashboard ──────────────────────────────────────── */
.hw-mini-stat{
  display:flex;flex-direction:column;align-items:center;
  padding:3px 8px;border-radius:8px;border:1px solid var(--border);
  background:var(--bg2);min-width:44px;
}
.hw-mini-stat span:first-child{font-size:15px;font-weight:700;color:var(--accent);line-height:1.2}
.hw-mini-stat span:last-child {font-size:11px;color:var(--text3);line-height:1.2}

/* Dept chip strip */
.hw-dept-strip{
  display:flex;align-items:center;gap:8px;
  background:var(--bg2);border:1px solid var(--border);border-radius:12px;
  padding:8px 12px;overflow:hidden;
}
.hw-dept-chips{display:flex;gap:6px;flex:1;overflow-x:auto;scrollbar-width:none}
.hw-dept-chips::-webkit-scrollbar{display:none}
.hw-dept-chip{
  display:flex;align-items:center;gap:5px;padding:6px 12px;
  border-radius:20px;border:1px solid var(--border);background:var(--bg3);
  cursor:pointer;white-space:nowrap;flex-shrink:0;
  font-size:13px;font-weight:600;color:var(--text);
  transition:background .12s,border-color .12s;
}
.hw-dept-chip:hover{background:var(--green2);border-color:var(--accent)}
.hw-dept-chip-count{font-size:11px;color:var(--text3);font-weight:400}

/* 3×2 widget grid */
.hw-grid{
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:10px;
}
.hw-widget{
  background:var(--bg2);border:1px solid var(--border);border-radius:12px;
  overflow:hidden;display:flex;flex-direction:column;
  transition:box-shadow .15s,border-color .15s;min-height:0;
}
.hw-widget:hover{box-shadow:var(--shadow);border-color:var(--border2)}
.hw-hdr{
  display:flex;align-items:center;gap:7px;
  padding:9px 11px 8px;border-bottom:1px solid var(--border);flex-shrink:0;
}
.hw-icon{
  width:26px;height:26px;border-radius:7px;
  display:flex;align-items:center;justify-content:center;
  font-size:15px;background:var(--green2);flex-shrink:0;
}
.hw-title{font-size:13px;font-weight:700;color:var(--text);flex:1}
.hw-link{font-size:12px;color:var(--accent);text-decoration:none;flex-shrink:0}
.hw-link:hover{text-decoration:underline}
.hw-badge{font-size:11px;font-weight:600;padding:2px 7px;border-radius:20px;flex-shrink:0}
.hw-body{padding:10px 12px;flex:1;overflow:hidden}
.hw-desc{font-size:13px;color:var(--text2);margin:0 0 8px;line-height:1.45}
.hw-chips-row{display:flex;gap:6px;flex-wrap:wrap;margin-bottom:8px}
.hw-stat-chip{
  padding:4px 9px;border-radius:7px;background:var(--bg3);border:1px solid var(--border);
  font-size:12px;color:var(--text2);
}
.hw-stat-chip b{color:var(--text);font-size:13px;display:block;line-height:1.2}
.hw-cta{
  padding:6px 13px;border-radius:7px;border:none;cursor:pointer;
  font-size:12px;font-weight:600;font-family:inherit;
  background:color-mix(in srgb,var(--ctac,#059669) 14%,transparent);
  color:var(--ctac,#059669);
  border:1px solid color-mix(in srgb,var(--ctac,#059669) 28%,transparent);
  transition:background .12s;
}
.hw-cta:hover{background:color-mix(in srgb,var(--ctac,#059669) 24%,transparent)}
.hw-empty{font-size:13px;color:var(--text3);text-align:center;padding:10px 0}
.hw-lb-row{display:flex;align-items:center;gap:8px;padding:5px 0;border-bottom:1px solid var(--border)}
.hw-lb-row:last-child{border-bottom:none}
.hw-rank{font-size:16px;width:24px;text-align:center;flex-shrink:0}
.hw-lb-name{flex:1;font-size:13px;font-weight:500;color:var(--text);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.hw-lb-score{font-size:13px;font-weight:700;color:var(--accent);flex-shrink:0}
.hw-bmark-row{padding:6px 0;border-bottom:1px solid var(--border);cursor:pointer}
.hw-bmark-row:last-child{border-bottom:none}
.hw-bmark-q{font-size:12px;color:var(--text);display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;line-height:1.4}
.hw-bmark-meta{font-size:11px;color:var(--text3);margin-top:2px}
.hw-mat-row{display:flex;align-items:center;gap:8px;padding:6px 0;border-bottom:1px solid var(--border);cursor:pointer}
.hw-mat-row:last-child{border-bottom:none}
.hw-mat-icon{width:28px;height:28px;border-radius:6px;background:var(--blue2);display:flex;align-items:center;justify-content:center;font-size:14px;flex-shrink:0}
.hw-mat-title{font-size:13px;font-weight:500;color:var(--text);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.hw-mat-meta{font-size:11px;color:var(--text3)}
.hw-acc-bar{height:6px;border-radius:3px;background:var(--border);overflow:hidden;margin-top:3px}
.hw-acc-fill{height:100%;border-radius:3px;background:var(--accent);transition:width .4s ease}

@media(max-width:860px){
  .hw-grid{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:500px){
  .hw-grid{grid-template-columns:1fr}
}

/* ── dept landing grid ──────────────────────────────────── */
.dept-landing-hdr{
  padding:24px 24px 16px;
  display:flex;align-items:flex-start;justify-content:space-between;
  flex-wrap:wrap;gap:12px;
  border-bottom:1px solid var(--border);
  position:sticky;top:0;z-index:10;
  background:var(--bg);
}
.dept-landing-hdr h2{font-size:20px;font-weight:700}
.dept-landing-hdr p{font-size:13px;color:var(--text2);margin-top:3px}
.dept-cards-grid{
  display:grid;
  grid-template-columns:repeat(auto-fill,minmax(185px,1fr));
  gap:14px;
  padding:20px 24px 40px;
}
/* ── Year / category chips in toolbar ───────────────────── */
.year-chip{
  display:inline-flex;align-items:center;gap:4px;
  padding:4px 11px;border-radius:20px;border:1px solid var(--border);
  background:var(--bg3);cursor:pointer;font-size:12px;font-weight:600;
  color:var(--text2);white-space:nowrap;
  transition:background .12s,border-color .12s,color .12s;
}
.year-chip:hover{background:var(--green2);border-color:var(--accent);color:var(--accent)}
.year-chip.active{background:var(--accent);border-color:var(--accent);color:#fff}
.year-chip .yc-count{font-size:10px;font-weight:400;opacity:.8}
/* ── Comment section ────────────────────────────────────── */
.cmt-card{background:var(--bg2);border:1px solid var(--border);border-radius:12px;padding:14px 16px}
.cmt-avatar{width:36px;height:36px;border-radius:50%;background:linear-gradient(135deg,var(--accent),#059669);display:flex;align-items:center;justify-content:center;font-size:15px;font-weight:700;color:#fff;flex-shrink:0}
.cmt-reply-card{background:var(--bg3);border:1px solid var(--border);border-radius:10px;padding:10px 12px;margin-top:8px}
/* ── Upload Modal ───────────────────────────────────────── */
@media(min-width:601px){
  .upload-modal-bg{align-items:center !important}
  .upload-modal-bg > div{border-radius:16px !important;max-width:520px}
}
/* ── Chatbot ─────────────────────────────────────────────── */
.chat-bubble{padding:9px 13px;border-radius:14px;font-size:13px;line-height:1.5;max-width:88%;word-break:break-word}
.chat-bot{background:var(--bg3);border:1px solid var(--border);color:var(--text);align-self:flex-start;border-bottom-left-radius:4px}
.chat-user{background:var(--accent);color:#fff;align-self:flex-end;border-bottom-right-radius:4px}
.chat-typing{color:var(--text3);font-style:italic;font-size:12px;align-self:flex-start}
.dept-card{
  background:var(--bg2);border:1px solid var(--border);
  border-radius:var(--r-lg);padding:18px 16px;
  cursor:pointer;transition:all .18s;
  display:flex;flex-direction:column;gap:6px;
  position:relative;
}
.dept-card:hover{
  border-color:var(--border2);
  box-shadow:var(--shadow);
  transform:translateY(-2px);
}
.dept-card.active-dept{
  border-color:var(--accent);
  background:var(--accent-glow);
}
.dc-emoji{font-size:36px;margin-bottom:4px;line-height:1}
.dc-name{font-size:14px;font-weight:600;color:var(--text);line-height:1.3}
.dc-meta{font-size:11px;color:var(--text3);margin-top:2px}
.dc-count{
  font-size:26px;font-weight:700;color:var(--accent);
  margin-top:auto;padding-top:10px;
}
.dc-count span{font-size:12px;font-weight:400;color:var(--text3)}
.dc-arrow{
  position:absolute;top:12px;right:12px;
  width:22px;height:22px;border-radius:50%;
  background:var(--bg3);border:1px solid var(--border);
  display:flex;align-items:center;justify-content:center;
  color:var(--text3);font-size:11px;transition:all .18s;
}
.dept-card:hover .dc-arrow{background:var(--accent-glow);border-color:var(--accent);color:var(--accent)}
.dept-card.active-dept .dc-arrow{background:var(--accent);border-color:var(--accent);color:#fff}

/* ── expanded dept card (signed-in home view) ─────────────── */
.dept-card-expanded{
  background:var(--bg2);border:1px solid var(--border);
  border-radius:var(--r-lg);overflow:hidden;
  transition:box-shadow .18s;
  grid-column: 1 / -1; /* full width */
}
.dept-card-expanded:hover{box-shadow:var(--shadow)}
.dce-header{
  display:flex;align-items:center;gap:14px;
  padding:16px 20px;cursor:pointer;
  border-bottom:1px solid var(--border);
  transition:background .15s;
}
.dce-header:hover{background:var(--bg3)}
.dce-browse-btn{
  flex-shrink:0;font-size:12px;font-weight:600;
  color:var(--accent2);padding:5px 12px;
  border:1px solid rgba(5,150,105,.3);border-radius:20px;
  white-space:nowrap;transition:all .15s;
}
.dce-header:hover .dce-browse-btn{background:var(--accent2);color:#fff;border-color:var(--accent2)}
.dce-cats{
  display:grid;
  grid-template-columns:repeat(auto-fill,minmax(200px,1fr));
  gap:0;
}
.dce-cat-item{
  display:flex;align-items:center;justify-content:space-between;
  padding:13px 20px;cursor:pointer;
  border-right:1px solid var(--border);
  border-bottom:1px solid var(--border);
  transition:background .15s;gap:8px;
}
.dce-cat-item:hover{background:var(--accent-glow)}
.dce-cat-name{font-size:13px;font-weight:500;color:var(--text);flex:1;min-width:0}
.dce-cat-count{
  font-size:11px;font-weight:700;color:var(--accent2);
  background:var(--green2);padding:2px 8px;border-radius:10px;
  white-space:nowrap;flex-shrink:0;
}
.dce-cat-loading{
  padding:16px 20px;font-size:13px;color:var(--text3);
  grid-column:1/-1;
}
/* switch to normal grid layout in expanded view */
.dept-cards-grid:has(.dept-card-expanded){
  grid-template-columns:1fr;
}

/* ── browse questions ────────────────────────────────────── */
.content-hdr{
  padding:20px 24px 0;display:flex;align-items:flex-start;
  justify-content:space-between;gap:12px;flex-wrap:wrap;
}
.content-title{font-size:20px;font-weight:700}
.content-sub{font-size:13px;color:var(--text2);margin-top:3px}
.toolbar{
  padding:14px 24px;display:flex;align-items:center;
  gap:10px;flex-wrap:wrap;border-bottom:1px solid var(--border);
}
.toolbar-left{display:flex;align-items:center;gap:8px;flex:1;flex-wrap:wrap}
.pill{
  padding:5px 12px;border-radius:20px;font-size:12px;font-weight:500;
  border:1px solid var(--border);background:transparent;color:var(--text2);
  cursor:pointer;transition:all .15s;
}
.pill:hover{background:var(--bg3);color:var(--text)}
.pill.on{background:var(--accent-glow);border-color:var(--accent);color:var(--accent)}
.count-badge{
  font-size:12px;font-weight:600;padding:4px 10px;border-radius:20px;
  background:var(--blue2);color:var(--blue);border:1px solid rgba(86,180,245,.25);
}
.toolbar-right{display:flex;align-items:center;gap:6px}

/* question cards */
.q-list{padding:16px 24px 40px;display:flex;flex-direction:column;gap:12px}
.qc{
  background:var(--bg2);border:1px solid var(--border);
  border-radius:var(--r-lg);overflow:hidden;
  transition:border-color .2s;
}
.qc:hover{border-color:var(--border2)}
.qc-head{
  padding:16px 18px;display:flex;align-items:flex-start;
  gap:12px;cursor:pointer;
}
.qc-num{
  flex-shrink:0;width:34px;height:34px;border-radius:8px;
  background:var(--bg3);border:1px solid var(--border);
  display:flex;align-items:center;justify-content:center;
  font-size:12px;font-weight:600;color:var(--text3);
  font-family:'JetBrains Mono',monospace;
}
.qc-body-wrap{flex:1;min-width:0}
.qc-tags{display:flex;align-items:center;gap:6px;margin-bottom:6px;flex-wrap:wrap}
.tag{
  padding:2px 8px;border-radius:4px;font-size:11px;font-weight:500;
  border:1px solid;display:inline-flex;align-items:center;gap:4px;
}
.tag-cat{background:var(--blue2);color:var(--blue);border-color:rgba(86,180,245,.25)}
.tag-free{background:var(--green2);color:var(--green);border-color:rgba(76,175,130,.25)}
.tag-premium{background:var(--yellow2);color:var(--yellow);border-color:rgba(240,180,41,.25)}
.qc-text{font-size:14px;font-weight:500;color:var(--text);line-height:1.5}
.qc-chevron{
  flex-shrink:0;width:26px;height:26px;border-radius:6px;
  background:transparent;border:1px solid var(--border);
  display:flex;align-items:center;justify-content:center;
  color:var(--text3);margin-top:4px;transition:all .2s;
}
.qc.open .qc-chevron{transform:rotate(180deg);background:var(--bg3)}
.q-star-badge{
  position:absolute;bottom:8px;right:14px;
  display:flex;align-items:center;gap:3px;
  font-size:11px;font-weight:600;color:var(--text3);
  pointer-events:none;user-select:none;
}
.q-star-badge .stars-ico{font-size:10px;letter-spacing:0}
.q-star-badge span{color:var(--text2)}
.stars-ico{font-style:normal;letter-spacing:1px}
.qc-body{display:none;padding:0 18px 16px;border-top:1px solid var(--border)}
.qc.open .qc-body{display:block}
.opts{padding:14px 0 0;display:flex;flex-direction:column;gap:7px}
.opt{
  display:flex;align-items:flex-start;gap:10px;
  padding:10px 13px;border-radius:var(--r);
  border:1px solid var(--border);background:var(--bg3);
  cursor:pointer;transition:all .15s;
}
.opt:hover{border-color:var(--border2);background:var(--bg4)}
.opt.sel{border-color:var(--accent);background:var(--accent-glow)}
.opt.ok{border-color:var(--green)!important;background:var(--green2)!important}
.opt.bad{border-color:var(--red)!important;background:var(--red2)!important}
.opt.show-ok{border-color:var(--green)!important;background:rgba(76,175,130,.06)!important;opacity:.75}
.opt-lbl{
  flex-shrink:0;width:26px;height:26px;border-radius:6px;
  background:var(--bg4);border:1px solid var(--border);
  display:flex;align-items:center;justify-content:center;
  font-size:11px;font-weight:700;color:var(--text3);
  font-family:'JetBrains Mono',monospace;transition:all .15s;
}
.opt.sel .opt-lbl{background:var(--accent-glow);border-color:var(--accent);color:var(--accent)}
.opt.ok  .opt-lbl{background:var(--green2);border-color:var(--green);color:var(--green)}
.opt.bad .opt-lbl{background:var(--red2);border-color:var(--red);color:var(--red)}
.opt.show-ok .opt-lbl{background:rgba(76,175,130,.15);border-color:var(--green);color:var(--green)}
.opt-txt{font-size:14px;color:var(--text);line-height:1.5;flex:1}
.opt-ico{margin-left:auto;flex-shrink:0;padding-top:2px;font-size:15px}
.q-result{
  display:none;padding:11px 13px;border-radius:var(--r);margin-top:10px;
  font-size:13px;font-weight:500;
}
.q-result.ok{background:var(--green2);border:1px solid rgba(76,175,130,.3);color:var(--green)}
.q-result.bad{background:var(--red2);border:1px solid rgba(240,90,90,.3);color:var(--red)}
.q-exp{
  display:none;margin-top:10px;padding:13px;border-radius:var(--r);
  background:var(--bg);border:1px solid var(--border);
  font-size:13px;color:var(--text2);line-height:1.6;
}
.q-exp.show{display:block}
.q-exp strong{color:var(--text);display:block;margin-bottom:4px}
.q-actions{display:flex;align-items:center;gap:8px;margin-top:12px;flex-wrap:wrap}
.btn{
  display:inline-flex;align-items:center;gap:6px;
  padding:7px 14px;border-radius:var(--r);font-size:13px;
  font-weight:500;border:none;transition:all .15s;
}
.btn:hover{opacity:.88}
.btn-primary{background:var(--accent2);color:#fff}
.btn-ghost{background:transparent;border:1px solid var(--border);color:var(--text2)}
.btn-ghost:hover{background:var(--bg3);opacity:1}
.btn-danger{background:transparent;border:1px solid rgba(240,90,90,.35);color:var(--red)}
.btn-danger:hover{background:var(--red2);opacity:1}
.btn-bm{background:transparent;border:1px solid var(--border);color:var(--text3)}
.btn-bm.on{border-color:var(--yellow);color:var(--yellow);background:var(--yellow2)}

/* ── Study Materials ────────────────────────────────────── */
.books-hdr{display:flex;align-items:flex-start;justify-content:space-between;padding:20px 24px 0;gap:12px}
.books-hdr-left{min-width:0}
.books-title{font-size:20px;font-weight:700;color:var(--text);line-height:1.2}
.books-sub{font-size:13px;color:var(--text3);margin-top:3px}
.books-upload-btn{flex-shrink:0;font-size:13px;padding:8px 16px}
.books-tabs-wrap{padding:14px 24px 0;border-bottom:1px solid var(--border);margin-bottom:0}
.books-tabs{display:flex;gap:6px;overflow-x:auto;-webkit-overflow-scrolling:touch;scrollbar-width:none;padding-bottom:0}
.books-tabs::-webkit-scrollbar{display:none}
.books-tab{padding:7px 16px 9px;border-radius:8px 8px 0 0;border:1px solid transparent;border-bottom:none;background:none;color:var(--text2);font-size:13px;cursor:pointer;font-family:inherit;font-weight:500;white-space:nowrap;transition:all .15s;position:relative;bottom:-1px}
.books-tab:hover{color:var(--text);background:var(--bg3)}
.books-tab.active{background:var(--bg);border-color:var(--border);color:var(--accent);font-weight:600}
.mat-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:14px;padding:20px 24px 80px}
.mat-grid.grouped{display:block;padding:20px 24px 80px}
.course-group{margin-bottom:6px}
.course-group-hdr{display:flex;align-items:center;justify-content:space-between;gap:8px;padding:10px 0 8px;border-bottom:1px solid var(--border);margin-bottom:14px}
.course-group-name{font-weight:700;font-size:15px;color:var(--text);display:flex;align-items:center;gap:7px;min-width:0}
.course-group-name span.cg-label{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.course-group-count{font-size:11px;font-weight:600;color:var(--text3);background:var(--bg3);border:1px solid var(--border);padding:2px 9px;border-radius:20px;white-space:nowrap;flex-shrink:0}
.course-group-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:14px;margin-bottom:26px}
.mat-card{background:var(--bg2);border:1px solid var(--border);border-radius:12px;padding:16px 14px;display:flex;flex-direction:column;gap:8px;cursor:pointer;transition:border-color .15s,box-shadow .15s,transform .12s}
.mat-card:hover{border-color:var(--accent);box-shadow:0 4px 18px rgba(0,0,0,.1);transform:translateY(-2px)}
.mat-card:active{transform:translateY(0)}
.mat-card-icon{display:flex;align-items:center;line-height:1}.mat-card-icon svg{width:36px;height:46px;flex-shrink:0;filter:drop-shadow(0 2px 4px rgba(220,38,38,.2))}
.mat-card-title{font-weight:600;font-size:14px;line-height:1.35;color:var(--text);overflow-wrap:anywhere;word-break:break-word;min-width:0}
.mat-card-desc{font-size:12px;color:var(--text2);flex:1;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.mat-card-meta{font-size:11px;color:var(--text3);margin-top:2px;display:flex;gap:6px;align-items:center}
.mat-card-meta::before{content:'';display:inline-block;width:5px;height:5px;border-radius:50%;background:#dc2626;flex-shrink:0}
@media(max-width:640px){
  .books-hdr{padding:14px 12px 0}
  .books-title{font-size:17px}
  .books-tabs-wrap{padding:10px 12px 0}
  .mat-grid{grid-template-columns:1fr 1fr;gap:10px;padding:14px 12px 80px}
  .mat-grid.grouped{padding:14px 12px 80px}
  .course-group-grid{grid-template-columns:1fr 1fr;gap:10px;margin-bottom:20px}
  .course-group-hdr{padding:8px 0 6px;margin-bottom:10px}
  .course-group-name{font-size:14px}
  .mat-card{padding:12px 10px}
  .mat-card-icon svg{width:30px;height:38px}
  .mat-card-title{font-size:13px}
}
/* PDF Reader overlay */
.pdf-overlay{position:fixed;inset:0;background:#000a;z-index:200;display:flex;flex-direction:column}
.pdf-overlay-hdr{display:flex;align-items:center;justify-content:space-between;background:var(--bg2);border-bottom:1px solid var(--border);padding:10px 16px;gap:12px;flex-shrink:0}
.pdf-overlay-title{font-weight:600;font-size:14px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:60vw}
.pdf-viewer-wrap{flex:1;overflow-y:auto;background:#525659;display:flex;flex-direction:column;align-items:center;padding:16px 8px;gap:12px}
.pdf-viewer-wrap canvas{box-shadow:0 4px 20px rgba(0,0,0,.5);max-width:100%}
.pdf-nav{display:flex;align-items:center;gap:10px;background:var(--bg2);border-top:1px solid var(--border);padding:8px 16px;flex-shrink:0;justify-content:center}
.pdf-nav span{font-size:13px;color:var(--text2);min-width:90px;text-align:center}

/* ── pagination ─────────────────────────────────────────── */
.pgn{display:flex;align-items:center;gap:5px}
.pgn-btn{
  width:32px;height:32px;border-radius:7px;border:1px solid var(--border);
  background:transparent;color:var(--text2);font-size:13px;
  display:flex;align-items:center;justify-content:center;cursor:pointer;transition:all .15s;
}
.pgn-btn:hover{background:var(--bg3);color:var(--text)}
.pgn-btn.on{background:var(--accent2);border-color:var(--accent);color:#fff}
.pgn-btn:disabled{opacity:.3;cursor:not-allowed}
.page-size-sel{height:32px;padding:0 8px;border:1px solid var(--border);border-radius:8px;background:var(--bg2);color:var(--text);font-size:13px;cursor:pointer;outline:none}
.page-size-sel:focus{border-color:var(--accent)}

/* ── Quiz mode ──────────────────────────────────────────── */
#viewQuiz{min-height:calc(100vh - 60px);display:none;flex-direction:column}
#viewQuiz.active{display:flex}
.quiz-shell{
  flex:1;display:flex;flex-direction:column;
  align-items:center;padding:30px 20px;
}
.quiz-hdr{width:100%;max-width:680px;margin-bottom:20px;transition:max-width .35s ease}
.quiz-prog-bar{height:6px;background:var(--bg3);border-radius:3px;overflow:hidden;margin-bottom:10px}
.quiz-prog-fill{height:100%;background:var(--accent);border-radius:3px;transition:width .4s ease}
.quiz-prog-row{display:flex;justify-content:space-between;font-size:12px;color:var(--text2)}
.quiz-score{display:flex;gap:16px}
.qs-correct{color:var(--green);font-weight:600}
.qs-wrong{color:var(--red);font-weight:600}
.quiz-card{
  width:100%;max-width:680px;background:var(--bg2);
  border:1px solid var(--border);border-radius:var(--r-lg);
  padding:28px;transition:max-width .35s ease;
}
.quiz-shell.expanded .quiz-hdr,
.quiz-shell.expanded .quiz-card,
.quiz-shell.expanded .quiz-footer{max-width:min(980px,96vw)}
.quiz-qnum{font-size:12px;color:var(--text3);margin-bottom:10px;
  font-family:'JetBrains Mono',monospace}
.quiz-qtxt{font-size:17px;font-weight:600;line-height:1.55;margin-bottom:20px}
.quiz-opts{display:flex;flex-direction:column;gap:8px}
.quiz-opt{
  display:flex;align-items:flex-start;gap:12px;
  padding:13px 16px;border-radius:var(--r);
  border:2px solid var(--border);background:var(--bg3);
  cursor:pointer;transition:all .18s;
}
.quiz-opt:hover{border-color:var(--accent);background:var(--accent-glow)}
.quiz-opt.sel{border-color:var(--accent);background:var(--accent-glow)}
.quiz-opt.ok{border-color:var(--green)!important;background:var(--green2)!important}
.quiz-opt.bad{border-color:var(--red)!important;background:var(--red2)!important}
.quiz-opt.show-ok{border-color:var(--green)!important;background:rgba(76,175,130,.06)!important}
.quiz-lbl{
  flex-shrink:0;width:30px;height:30px;border-radius:8px;
  border:2px solid var(--border2);background:var(--bg4);
  display:flex;align-items:center;justify-content:center;
  font-weight:700;font-size:13px;color:var(--text2);
  font-family:'JetBrains Mono',monospace;transition:all .18s;
}
.quiz-opt.sel .quiz-lbl{border-color:var(--accent);color:var(--accent);background:var(--accent-glow)}
.quiz-opt.ok  .quiz-lbl{border-color:var(--green);color:var(--green);background:var(--green2)}
.quiz-opt.bad .quiz-lbl{border-color:var(--red);color:var(--red);background:var(--red2)}
.quiz-opt.show-ok .quiz-lbl{border-color:var(--green);color:var(--green)}
.quiz-otxt{font-size:15px;color:var(--text);line-height:1.45;flex:1;padding-top:2px}
.quiz-feedback{
  margin-top:16px;padding:13px 16px;border-radius:var(--r);
  font-size:14px;font-weight:500;display:none;
}
.quiz-feedback.ok{background:var(--green2);border:1px solid rgba(76,175,130,.3);color:var(--green)}
.quiz-feedback.bad{background:var(--red2);border:1px solid rgba(240,90,90,.3);color:var(--red)}
.quiz-exp{
  margin-top:10px;padding:13px;border-radius:var(--r);
  background:var(--bg);border:1px solid var(--border);
  font-size:13px;color:var(--text2);line-height:1.6;display:none;
}
.quiz-exp strong{color:var(--text);display:block;margin-bottom:4px}
.quiz-footer{
  width:100%;max-width:680px;margin-top:16px;
  display:flex;justify-content:space-between;align-items:center;gap:10px;
  transition:max-width .35s ease;
  position:sticky;bottom:0;z-index:20;
  background:var(--bg);padding:10px 0 16px;
}

/* ── Results screen ─────────────────────────────────────── */
#viewResults{
  height:calc(100vh - 60px);display:none;
  flex-direction:column;align-items:center;
  padding:0;text-align:center;overflow:hidden;
}
#viewResults.active{display:flex}
/* results: sidebar + main layout */
#viewResults{flex-direction:row!important;align-items:stretch}
.results-sidebar{width:200px;flex-shrink:0;display:flex;flex-direction:column;align-items:center;gap:12px;padding:20px 14px;border-right:1px solid var(--border);background:var(--bg2)}
.results-sidebar .result-circle{margin:0}
.results-sidebar .result-title{font-size:15px;text-align:center}
.results-sidebar .result-sub{font-size:12px;color:var(--text2);text-align:center}
.results-sidebar .result-stats{flex-direction:column;gap:6px;width:100%;margin:0}
.results-sidebar .rs-card{min-width:unset;width:100%;padding:7px 10px;display:flex;align-items:center;justify-content:space-between;flex-direction:row;gap:8px}
.results-sidebar .rs-val{font-size:16px}
.results-sidebar .rs-lbl{font-size:12px;margin:0}
.results-sidebar-actions{display:flex;flex-direction:column;gap:8px;width:100%;margin-top:auto}
.results-sidebar-actions .btn{width:100%;justify-content:center;padding:9px 12px;font-size:13px}
.results-main{flex:1;min-width:0;display:flex;flex-direction:column;overflow:hidden}
.results-scroll{flex:1;min-height:0;overflow-y:auto;width:100%;display:flex;flex-direction:column;padding:10px 16px}
.results-actions{display:none}
@media(max-width:600px){
  #viewResults{flex-direction:column!important}
  .results-sidebar{width:100%;flex-direction:row;flex-wrap:wrap;justify-content:center;border-right:none;border-bottom:1px solid var(--border);padding:12px 16px;gap:10px}
  .results-sidebar .result-stats{flex-direction:row;width:auto}
  .results-sidebar .rs-card{flex-direction:column;min-width:60px;width:auto}
  .results-sidebar-actions{flex-direction:row;width:auto;margin-top:0}
  .results-sidebar-actions .btn{width:auto}
  .results-main{min-height:0}
}
.result-circle{
  width:90px;height:90px;border-radius:50%;
  border:5px solid var(--accent);
  display:flex;flex-direction:column;align-items:center;justify-content:center;
  margin:0 auto 12px;background:var(--accent-glow);flex-shrink:0;
}
.result-pct{font-size:26px;font-weight:700;color:var(--accent)}
.result-label{font-size:11px;color:var(--text3);margin-top:1px}
.result-title{font-size:18px;font-weight:700;margin-bottom:4px}
.result-sub{font-size:13px;color:var(--text2);margin-bottom:10px}
.result-stats{display:flex;gap:8px;justify-content:center;margin-bottom:0;flex-wrap:wrap}
.rs-card{
  background:var(--bg2);border:1px solid var(--border);border-radius:var(--r);
  padding:8px 14px;min-width:70px;text-align:center;
}
.rs-val{font-size:18px;font-weight:700}
.rs-lbl{font-size:11px;color:var(--text2);margin-top:1px}
.rs-card.green .rs-val{color:var(--green)}
.rs-card.red   .rs-val{color:var(--red)}
.rs-card.blue  .rs-val{color:var(--blue)}
.review-list{width:100%;text-align:left;margin-bottom:8px}
.rv-item{
  background:var(--bg2);border:1px solid var(--border);
  border-radius:var(--r);padding:10px 12px;margin-bottom:6px;
}
.rv-item.correct{border-left:3px solid var(--green)}
.rv-item.wrong{border-left:3px solid var(--red)}
.rv-qtxt{font-size:14px;font-weight:500;margin-bottom:8px}
.rv-ans{font-size:13px}
.rv-correct{color:var(--green)}
.rv-wrong{color:var(--red)}
.rv-exp{font-size:12px;color:var(--text2);margin-top:6px;padding-top:6px;border-top:1px solid var(--border)}

/* ── Leaderboard ────────────────────────────────────────── */
.lb-tabs{display:flex;gap:8px;padding:16px 24px 0;flex-wrap:wrap}
.lb-tab{
  padding:7px 16px;border-radius:var(--r);font-size:13px;font-weight:500;
  border:1px solid var(--border);background:transparent;color:var(--text2);cursor:pointer;
  transition:all .15s;
}
.lb-tab.on{background:var(--accent-glow);border-color:var(--accent);color:var(--accent)}
.lb-table{padding:16px 24px 40px}
.lb-row{
  display:flex;align-items:center;gap:12px;
  padding:12px 16px;border-radius:var(--r);
  background:var(--bg2);border:1px solid var(--border);margin-bottom:6px;
  transition:border-color .15s;
}
.lb-row:hover{border-color:var(--border2)}
.lb-rank{
  width:32px;height:32px;border-radius:8px;
  background:var(--bg3);border:1px solid var(--border);
  display:flex;align-items:center;justify-content:center;
  font-size:12px;font-weight:700;color:var(--text3);flex-shrink:0;
  font-family:'JetBrains Mono',monospace;
}
.lb-rank.gold{background:rgba(240,180,41,.15);border-color:var(--yellow);color:var(--yellow)}
.lb-rank.silver{background:rgba(189,189,189,.12);border-color:#bdbdbd;color:#bdbdbd}
.lb-rank.bronze{background:rgba(205,127,50,.12);border-color:#cd7f32;color:#cd7f32}
.lb-name{flex:1;font-size:14px;font-weight:500;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.lb-score{font-size:14px;font-weight:700;color:var(--accent);white-space:nowrap;flex-shrink:0}

/* ── Progress ───────────────────────────────────────────── */
.prog-stats-row{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin-top:20px}
.prog-stat{background:var(--bg2);border:1px solid var(--border);border-radius:var(--r-lg);padding:18px 20px}
.prog-stat-val{font-size:28px;font-weight:800;color:var(--accent);letter-spacing:-.02em}
.prog-stat-lbl{font-size:12px;color:var(--text3);margin-top:2px}
.prog-stat-sub{font-size:11px;color:var(--text2);margin-top:4px}
.prog-dept-card{background:var(--bg2);border:1px solid var(--border);border-radius:var(--r-lg);padding:18px 20px;margin-bottom:10px}
.prog-dept-name{font-size:14px;font-weight:600;margin-bottom:10px;display:flex;align-items:center;gap:8px}
.prog-bar-wrap{background:var(--bg3);border-radius:4px;height:8px;overflow:hidden;margin-bottom:4px}
.prog-bar-fill{height:100%;border-radius:4px;background:linear-gradient(90deg,var(--accent),var(--accent2));transition:width .6s}
.prog-bar-labels{display:flex;justify-content:space-between;font-size:11px;color:var(--text3)}
.prog-session-row{display:flex;align-items:center;gap:14px;padding:12px 16px;background:var(--bg2);border:1px solid var(--border);border-radius:var(--r);margin-bottom:6px}
.prog-session-score{width:52px;height:52px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:14px;font-weight:800;flex-shrink:0;border:3px solid}
.prog-session-score.great{color:#059669;border-color:#059669;background:rgba(5,150,105,.08)}
.prog-session-score.good{color:#D97706;border-color:#D97706;background:rgba(217,119,6,.08)}
.prog-session-score.low{color:#DC2626;border-color:#DC2626;background:rgba(220,38,38,.08)}
.prog-section-title{font-size:13px;font-weight:700;color:var(--text2);margin-bottom:12px;text-transform:uppercase;letter-spacing:.06em}

/* ── Notifications ──────────────────────────────────────── */
.notif-item{display:flex;gap:14px;padding:16px;background:var(--bg2);border:1px solid var(--border);border-radius:var(--r-lg);margin-bottom:8px;transition:border-color .15s;cursor:default}
.notif-item.unread{border-left:3px solid var(--accent2);background:rgba(5,150,105,.03)}
.notif-item:hover{border-color:var(--border2)}
.notif-icon{width:40px;height:40px;border-radius:10px;display:flex;align-items:center;justify-content:center;font-size:18px;flex-shrink:0}
.notif-body{flex:1;min-width:0}
.notif-title{font-size:14px;font-weight:600;color:var(--text);margin-bottom:3px}
.notif-desc{font-size:13px;color:var(--text2);line-height:1.5}
.notif-time{font-size:11px;color:var(--text3);margin-top:5px}
.notif-unread-dot{width:8px;height:8px;border-radius:50%;background:var(--accent2);flex-shrink:0;margin-top:6px}

/* ── Bookmarks ──────────────────────────────────────────── */
.bm-list{padding:16px 24px 40px;display:flex;flex-direction:column;gap:10px}
.bm-card{
  background:var(--bg2);border:1px solid var(--border);border-radius:var(--r-lg);
  padding:16px 18px;
}
.bm-q{font-size:14px;font-weight:500;margin-bottom:10px}
.bm-answer{font-size:13px;padding:8px 12px;border-radius:7px;
  background:var(--green2);color:var(--green);border:1px solid rgba(76,175,130,.25)}
.bm-meta{font-size:12px;color:var(--text3);margin-top:8px}

/* ── empty/loading/error ────────────────────────────────── */
.empty{
  display:flex;flex-direction:column;align-items:center;
  justify-content:center;padding:80px 20px;text-align:center;gap:12px;
}
.empty-icon{font-size:44px;opacity:.3}
.empty-title{font-size:17px;font-weight:600}
.empty-sub{font-size:14px;color:var(--text2);max-width:300px}
.spinner{width:30px;height:30px;border:3px solid var(--bg4);border-top-color:var(--accent);border-radius:50%;animation:spin .7s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}

/* ── Modal ──────────────────────────────────────────────── */
.modal-bg{
  display:none;position:fixed;inset:0;
  background:rgba(0,0,0,.7);z-index:500;
  align-items:center;justify-content:center;padding:20px;
}
.modal-bg.open{display:flex}
.modal{
  background:var(--bg2);border:1px solid var(--border);
  border-radius:var(--r-lg);padding:24px;max-width:440px;width:100%;
  box-shadow:var(--shadow-lg);
  max-height:calc(100vh - 40px);overflow-y:auto;
}
.modal h3{font-size:16px;font-weight:600;margin-bottom:8px}
.modal p{font-size:13px;color:var(--text2);margin-bottom:16px;line-height:1.6}
.form-row{display:flex;flex-direction:column;gap:6px;margin-bottom:14px}
.form-label{font-size:12px;font-weight:500;color:var(--text2)}
.form-select,.form-input,.form-textarea{
  background:var(--bg3);border:1px solid var(--border);
  border-radius:var(--r);padding:9px 12px;color:var(--text);
  font-size:13px;outline:none;transition:border-color .2s;width:100%;
}
.form-select:focus,.form-input:focus,.form-textarea:focus{border-color:var(--accent)}
.form-textarea{resize:vertical;min-height:80px}
.modal-btns{display:flex;gap:8px;justify-content:flex-end}
@media(max-width:500px){
  .modal-bg{padding:0;align-items:flex-end}
  .modal{border-radius:var(--r-xl) var(--r-xl) 0 0;max-height:92vh;width:100%;max-width:100%}
  .modal-btns{flex-direction:column-reverse}
  .modal-btns .btn{width:100%;justify-content:center}
}

/* ── Premium modal ──────────────────────────────────────── */
.prem-modal-bg{padding:16px}
.prem-modal{
  background:var(--bg2);border:1px solid var(--border);border-radius:18px;
  width:100%;max-width:460px;box-shadow:var(--shadow-lg);
  display:flex;flex-direction:column;overflow:hidden;
  max-height:calc(100vh - 32px);
}
.prem-hdr{
  display:flex;align-items:center;justify-content:space-between;gap:12px;
  padding:14px 18px 12px;border-bottom:1px solid var(--border);flex-shrink:0;
}
.prem-hdr-title{font-size:16px;font-weight:700;color:var(--yellow)}
.prem-hdr-sub{font-size:11.5px;color:var(--text2);margin-top:1px}
.prem-close{
  background:none;border:none;color:var(--text3);font-size:18px;
  cursor:pointer;padding:0;line-height:1;flex-shrink:0;
}
.prem-price-strip{
  display:flex;align-items:center;
  background:var(--bg3);border-bottom:1px solid var(--border);flex-shrink:0;
}
.prem-price-item{display:flex;align-items:center;justify-content:space-between;flex:1;padding:8px 16px;gap:8px}
.prem-price-div{width:1px;background:var(--border);align-self:stretch}
.prem-price-lbl{font-size:12px;color:var(--text2)}
.prem-price-val{font-size:15px;font-weight:700;color:var(--yellow)}
.prem-body{flex:1;overflow-y:auto;min-height:0;padding:8px 0 0}
.prem-section-lbl{font-size:11px;font-weight:600;color:var(--text3);text-transform:uppercase;letter-spacing:.5px;padding:6px 16px 4px}
.prem-accounts{display:flex;flex-direction:column;gap:4px;padding:0 14px 6px}
.prem-acc-row{
  display:flex;align-items:center;gap:8px;
  background:var(--bg3);border:1px solid var(--border);border-radius:10px;padding:7px 10px;
}
.prem-acc-logo{width:32px;height:32px;object-fit:contain;border-radius:6px;flex-shrink:0;background:var(--bg2)}
.prem-acc-icon{font-size:16px;flex-shrink:0;width:32px;height:32px;align-items:center;justify-content:center}
.prem-acc-info{flex:1;min-width:0}
.prem-acc-top{display:flex;align-items:center;gap:6px}
.prem-acc-bank{font-size:10px;font-weight:600;color:var(--text3);text-transform:uppercase}
.prem-acc-name{font-size:12px;font-weight:600;color:var(--text)}
.prem-acc-num{font-size:11.5px;color:var(--text2);font-family:monospace;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.prem-acc-copy{
  background:var(--bg2);border:1px solid var(--border);border-radius:6px;
  color:var(--text2);font-size:11px;padding:3px 8px;cursor:pointer;flex-shrink:0;
}
.prem-tip{
  margin:0 14px 8px;padding:8px 11px;background:var(--yellow2);
  border:1px solid rgba(217,119,6,.2);border-radius:var(--r);
  font-size:11.5px;color:var(--text2);line-height:1.5;
}
.prem-form-grid{
  display:grid;grid-template-columns:1fr 1fr;gap:7px 10px;padding:0 14px 4px;
}
.prem-field{display:flex;flex-direction:column;gap:3px}
.prem-field-full{grid-column:1/-1}
.prem-field .form-label{font-size:11px;font-weight:500;color:var(--text2)}
.prem-field .form-select,.prem-field .form-input{padding:7px 9px;font-size:12px}
/* sticky footer */
.prem-actions{
  display:flex;gap:8px;justify-content:flex-end;
  padding:10px 14px 14px;border-top:1px solid var(--border);flex-shrink:0;
  background:var(--bg2);
}
.prem-submit{background:var(--yellow)!important;color:#000!important;border-color:var(--yellow)!important;flex:1}
@media(max-width:500px){
  .prem-modal-bg{padding:0;align-items:flex-end!important}
  .prem-modal{border-radius:20px 20px 0 0;max-width:100%;max-height:92vh}
  .prem-actions .btn{flex:1;justify-content:center}
  /* hide chatbot FAB when premium modal is open */
  #modalPremium.open ~ * #chatFab,
  body:has(#modalPremium.open) #chatFab{display:none!important}
}

/* ── Chatbot ────────────────────────────────────────────── */
.chat-fab{
  position:fixed;bottom:28px;right:28px;z-index:900;
  width:52px;height:52px;border-radius:50%;border:none;cursor:pointer;
  background:linear-gradient(135deg,var(--accent),#059669);
  transition:bottom .25s ease,transform .15s,box-shadow .15s;
  box-shadow:0 4px 18px rgba(0,0,0,.25);
  display:flex;align-items:center;justify-content:center;
  font-size:24px;transition:transform .15s,box-shadow .15s;
}
.chat-fab:hover{transform:scale(1.08)}
.chat-unread{
  position:fixed;bottom:68px;right:24px;z-index:901;
  background:var(--red);color:#fff;border-radius:10px;padding:2px 7px;
  font-size:11px;font-weight:700;display:none;pointer-events:none;
}
.chat-panel{
  position:fixed;bottom:90px;right:28px;z-index:900;
  width:320px;max-height:480px;display:none;flex-direction:column;
  background:var(--bg2);border:1px solid var(--border);border-radius:18px;
  box-shadow:0 12px 48px rgba(0,0,0,.28);overflow:hidden;
}
.chat-panel.open{display:flex}
.chat-panel-hdr{
  padding:14px 16px;border-bottom:1px solid var(--border);
  display:flex;align-items:center;gap:10px;
  background:linear-gradient(135deg,var(--accent),#059669);flex-shrink:0;
}
.chat-messages{
  flex:1;overflow-y:auto;padding:14px;
  display:flex;flex-direction:column;gap:10px;
  min-height:200px;max-height:320px;
}
.chat-chips-bar{
  display:flex;gap:6px;padding:6px 12px;overflow-x:auto;flex-shrink:0;
  border-top:1px solid var(--border);scrollbar-width:none;
  background:var(--bg2);
}
.chat-chips-bar::-webkit-scrollbar{display:none}
.chat-chips-bar .chat-chip{white-space:nowrap;flex-shrink:0;padding:7px 12px;font-size:11.5px}
.chat-input-row{
  padding:10px 12px;border-top:1px solid var(--border);
  display:flex;gap:8px;flex-shrink:0;
}
.chat-input{
  flex:1;padding:9px 12px;border-radius:20px;
  border:1px solid var(--border);background:var(--bg3);
  color:var(--text);font-size:13px;font-family:inherit;outline:none;
}
.chat-send{
  width:36px;height:36px;border-radius:50%;border:none;
  background:var(--accent);color:#fff;cursor:pointer;
  font-size:16px;display:flex;align-items:center;justify-content:center;flex-shrink:0;
}
.chat-suggestions{display:grid;grid-template-columns:1fr 1fr;gap:7px;margin-top:6px}
.chat-chip{
  text-align:left;padding:10px 12px;border-radius:12px;
  border:1px solid var(--border);background:var(--bg3);
  color:var(--text);font-size:12px;cursor:pointer;font-family:inherit;
  transition:background .15s,border-color .15s;line-height:1.4;
  display:flex;align-items:flex-start;gap:6px;word-break:break-word;
}
.chat-chip:hover{background:var(--accent-glow);border-color:var(--accent);color:var(--accent)}
.chat-followups{margin-top:4px;padding-left:4px}
@media(max-width:600px){
  .chat-fab{bottom:16px;right:16px;width:48px;height:48px;font-size:22px}
  .chat-unread{bottom:56px;right:12px}
  .chat-panel{
    right:0;left:0;bottom:0;width:100%;
    border-radius:20px 20px 0 0;
    max-height:75vh;
  }
}
/* ── Toast ──────────────────────────────────────────────── */
.toasts{position:fixed;bottom:20px;right:20px;z-index:999;display:flex;flex-direction:column;gap:7px}
.toast{
  background:var(--bg3);border:1px solid var(--border);
  border-radius:var(--r);padding:11px 16px;font-size:13px;color:var(--text);
  box-shadow:var(--shadow-lg);opacity:0;transform:translateY(8px);
  transition:all .25s;min-width:180px;max-width:300px;
}
.toast.show{opacity:1;transform:translateY(0)}
.toast.ok{border-left:3px solid var(--green)}
.toast.err{border-left:3px solid var(--red)}
.toast.info{border-left:3px solid var(--accent)}

/* ── auth chip ──────────────────────────────────────────── */
/* ── auth area — single pill ─────────────────────────── */
.auth-pill{
  display:flex;align-items:center;
  background:var(--bg3);border:1px solid var(--border);
  border-radius:24px;overflow:hidden;transition:border-color .15s;
}
.auth-pill:hover{border-color:var(--border2)}
.user-chip{
  display:flex;align-items:center;gap:7px;
  padding:5px 10px 5px 6px;
  font-size:12px;color:var(--text2);cursor:pointer;
  text-decoration:none;transition:background .15s;border-radius:24px 0 0 24px;
}
.user-chip:hover{background:var(--bg4)}
.user-avatar{
  width:24px;height:24px;border-radius:50%;
  background:linear-gradient(135deg,var(--accent),var(--accent2));
  display:flex;align-items:center;justify-content:center;
  font-size:11px;font-weight:700;color:#fff;flex-shrink:0;overflow:hidden;
}
.user-avatar img{width:100%;height:100%;object-fit:cover;border-radius:50%}
.user-chip .premium-star{color:var(--yellow);font-size:11px}
.pill-divider{width:1px;background:var(--border);align-self:stretch;margin:5px 0}
.btn-logout{
  display:flex;align-items:center;justify-content:center;
  padding:0 11px;height:100%;background:transparent;border:none;
  color:var(--text3);cursor:pointer;font-size:13px;transition:all .15s;
  border-radius:0 24px 24px 0;
}
.btn-logout:hover{background:var(--red2);color:var(--red)}
.btn-signin{
  height:32px;padding:0 16px;border-radius:20px;font-size:12px;font-weight:600;
  background:var(--accent2);border:none;color:#fff;cursor:pointer;
  transition:opacity .15s;
}
.btn-signin:hover{opacity:.88}

/* ── footer ──────────────────────────────────────────────── */
.site-footer{background:var(--footer-bg);color:var(--footer-text);margin-top:auto;flex-shrink:0}

/* Premium CTA bar — tall, prominent */
.footer-cta{
  background:linear-gradient(90deg,var(--accent2) 0%,var(--accent) 100%);
  padding:18px 32px;
  display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;
}
.footer-cta-text{display:flex;align-items:center;gap:10px}
.footer-cta-text .cta-icon{font-size:1.4rem}
.footer-cta-text strong{font-size:15px;font-weight:800;color:#fff;display:block;margin-bottom:2px}
.footer-cta-text span{font-size:12px;color:rgba(255,255,255,.75)}
.footer-cta button{
  padding:10px 24px;background:var(--yellow);color:#000;border:none;
  border-radius:var(--r);font-weight:800;font-size:13px;cursor:pointer;white-space:nowrap;
  transition:opacity .15s;flex-shrink:0;box-shadow:0 2px 8px rgba(0,0,0,.2);
}
.footer-cta button:hover{opacity:.88}

/* Single-row compact body */
.footer-main{
  display:flex;align-items:center;justify-content:space-between;gap:20px;flex-wrap:wrap;
  padding:14px 32px;border-bottom:1px solid rgba(255,255,255,.07);
}
.footer-brand{display:flex;align-items:center;gap:9px}
.footer-brand .brand-mark-f{
  width:24px;height:24px;border-radius:6px;
  background:linear-gradient(135deg,var(--accent),var(--accent2));
  display:inline-flex;align-items:center;justify-content:center;font-size:12px;flex-shrink:0;
}
.footer-brand .brand-name{font-size:13px;font-weight:700;color:#fff}
.footer-brand .brand-tagline{font-size:10px;color:var(--footer-text)}

.footer-links{display:flex;gap:0;flex-wrap:wrap}
.footer-col{display:flex;flex-direction:column;gap:0}
.footer-col h4{display:none}
.footer-col ul{list-style:none;display:flex;flex-direction:row;gap:0;flex-wrap:wrap}
.footer-col ul li a{
  color:var(--footer-text);text-decoration:none;font-size:12px;
  padding:3px 12px;transition:color .15s;border-right:1px solid rgba(255,255,255,.1);
}
.footer-col ul li:last-child a{border-right:none}
.footer-col ul li a:hover{color:#fff}
.footer-contact-inline{font-size:11px;color:var(--footer-text)}
.footer-contact-inline a{color:var(--accent2);text-decoration:none;font-size:11px}
.footer-contact-inline a:hover{text-decoration:underline}

.footer-bottom{
  padding:9px 32px;display:flex;align-items:center;justify-content:space-between;
  font-size:11px;color:rgba(255,255,255,.25);flex-wrap:wrap;gap:6px;
}
.footer-bottom a{color:rgba(255,255,255,.3);text-decoration:none}
.footer-bottom a:hover{color:rgba(255,255,255,.6)}

@media(max-width:720px){
  .footer-cta{padding:14px 20px}
  .footer-main{padding:12px 20px}
  .footer-bottom{padding:8px 20px}
  .footer-col ul li a{padding:3px 8px;font-size:11px}
}
@media(max-width:480px){
  .footer-main{flex-direction:column;align-items:flex-start;gap:8px}
  .footer-cta-text strong{font-size:13px}
}

/* ── drawer backdrop (mobile) ───────────────────────────── */
.sidebar-backdrop{
  display:none;position:fixed;inset:0;background:rgba(0,0,0,.45);
  z-index:149;opacity:0;transition:opacity .25s;
}
.sidebar-backdrop.show{display:block;opacity:1}

/* ════════════════════════════════════════════════════════
   TABLET  (≤ 1024px)
════════════════════════════════════════════════════════ */
@media(max-width:1024px){
  .shell{grid-template-columns:220px 1fr}
  .stat-chip{font-size:11px;padding:4px 8px}
}

/* ════════════════════════════════════════════════════════
   MOBILE  (≤ 768px)  — sidebar becomes a slide-over drawer
════════════════════════════════════════════════════════ */
@media(max-width:768px){
  .prog-stats-row{grid-template-columns:1fr 1fr}
  #btnBrowse,#btnBM,#btnLB,#btnNotif{display:none}
}
@media(max-width:768px){
  /* shell is always single-column; sidebar is NOT in the grid */
  .shell{
    grid-template-columns:1fr !important;
    grid-template-rows:56px 1fr;
  }
  .shell.sidebar-collapsed{grid-template-columns:1fr !important}

  /* sidebar: fixed drawer sliding in from left */
  .sidebar{
    position:fixed;top:0;left:0;bottom:0;
    width:84vw;max-width:300px;z-index:150;
    transform:translateX(-100%);
    transition:transform .25s ease;
    box-shadow:none;
    opacity:1 !important;pointer-events:auto !important;
  }
  .sidebar.mobile-open{
    transform:translateX(0);
    box-shadow:4px 0 24px rgba(0,0,0,.18);
  }
  /* override desktop collapse style on mobile */
  .shell.sidebar-collapsed .sidebar{
    transform:translateX(-100%);
    opacity:1 !important;pointer-events:auto !important;
  }
  /* compact footer on mobile so departments have room */
  .quiz-mode-btns{gap:2px}
  .mode-btn{padding:7px 10px;font-size:12px}
  .mode-icon{font-size:14px;width:20px}
  .sidebar-lbl{padding:0 12px 4px;font-size:9px}
  .sidebar-sec{margin-bottom:4px}
  .prem-sidebar-btn{padding:8px 12px}
  .sidebar-foot .sidebar-divider{margin:6px 12px}

  /* topbar adjustments */
  .topbar{padding:0 10px;gap:6px;height:56px}
  .topbar-center{flex:1;min-width:0}
  .stat-chip{display:none}
  .topbar-right{gap:4px}

  /* shrink nav buttons */
  .nav-btn{width:32px;height:32px;font-size:14px}

  /* hide text labels, keep only icons */
  .nav-btn svg{width:15px;height:15px}

  /* sign in button compact */
  .btn-signin{padding:6px 12px;font-size:12px}

  /* auth pill compact — show avatar only, hide name */
  .user-chip span{display:none}
  .user-chip{padding:4px 6px;border-radius:50%}
  .user-avatar{width:28px;height:28px;font-size:11px;flex-shrink:0}
  .pill-divider{display:none}
  .auth-pill{gap:2px;padding:3px;border-radius:24px;overflow:visible}
  .btn-logout{padding:0 8px;height:34px;border-radius:50%;flex-shrink:0}
  .btn-signin{padding:6px 10px;font-size:12px}

  /* admin button compact */
  #adminPortalBtn{padding:0 8px !important;font-size:11px !important}

  /* hamburger always visible on mobile — show it in topbar */
  #btnSidebarTop{display:flex !important}
  #btnSidebar{display:none}

  /* search input compact */
  .search-wrap input{padding:7px 10px 7px 32px;font-size:13px}

  /* main fills full width */
  .main{height:calc(100vh - 56px);overflow-y:auto}

  /* department landing header — compact on mobile */
  .dept-landing-hdr{
    padding:10px 12px 8px;
    flex-direction:row;
    align-items:center;
    gap:8px;
  }
  .dept-landing-hdr h2{font-size:15px}
  .dept-landing-hdr p{font-size:11px;margin-top:1px}
  .dept-landing-hdr > div:last-child{
    display:flex;flex-direction:row;flex-wrap:nowrap;gap:5px;margin-left:auto;flex-shrink:0;
  }
  .stat-card{padding:5px 7px;min-width:0}
  .stat-card .val{font-size:13px}
  .stat-card .lbl{font-size:9px;margin-top:0}

  /* department cards — 2 columns on mobile */
  .dept-cards-grid{
    grid-template-columns:repeat(2,1fr) !important;
    padding:16px;gap:12px;
  }
  .dc-emoji{font-size:28px}

  /* content padding — a bit more breathing room on phones */
  .content-hdr,.toolbar,.q-list,.bm-list,.lb-table{
    padding-left:16px;padding-right:16px;
  }
  .content-hdr{padding-top:14px;padding-bottom:6px}
  .q-list{padding-bottom:20px}

  /* quiz card */
  .quiz-wrap{padding:12px}
  .q-opts{gap:8px}

  /* results */
  .results-head{flex-direction:column;gap:12px}
  .results-head-info{align-items:center;text-align:center}
  .result-stats{justify-content:center}

  /* leaderboard */
  .lb-table{font-size:13px;padding-left:8px;padding-right:8px}
  .lb-row{padding:10px 12px;gap:10px}
  .lb-rank{width:28px;height:28px;font-size:11px}
  .lb-name{font-size:13px}
  .lb-score{font-size:13px}
  #myRankBanner{margin:0 8px 12px!important;padding:12px 14px!important;gap:10px!important;flex-wrap:wrap}
  #myRankBanner > div:first-child{font-size:22px!important}
  #myRankNum,#myRankSessions,#myRankScore{font-size:16px!important;font-weight:800}

}

/* ════════════════════════════════════════════════════════
   SMALL MOBILE  (≤ 480px)
════════════════════════════════════════════════════════ */
@media(max-width:480px){
  .brand span{display:none}
  .brand-mark{width:28px;height:28px;font-size:13px;border-radius:8px}
  .topbar{gap:4px;padding:0 8px;height:52px}
  .brand{margin-right:0;flex-shrink:0}
  .hamburger-btn{margin-left:0;width:32px;height:32px;flex-shrink:0}
  .topbar-center{min-width:0;flex:1}
  .topbar-right{gap:2px;flex-shrink:0}
  .nav-btn{width:30px;height:30px;font-size:13px;flex-shrink:0}

  /* hide browse/bookmark/leaderboard topbar buttons — accessible via sidebar */
  #btnBrowse,#btnBM,#btnLB,#btnNotif{display:none!important}
  /* shrink admin badge to icon only */
  #adminPortalBtn{padding:0 8px;font-size:11px;width:auto}
  #adminPortalBtn::before{content:'🛡';font-size:14px}
  #adminPortalBtn{font-size:0}
  #adminPortalBtn::before{font-size:14px}

  /* search takes remaining space */
  .topbar-center{flex:1}
  .search-wrap input{padding:6px 8px 6px 30px;font-size:12px}

  /* dept cards */
  .dept-cards-grid{grid-template-columns:1fr 1fr !important;gap:8px;padding:10px}
  .dc-emoji{font-size:24px}
  .dc-name{font-size:12px}
  .dc-count{font-size:20px}

  /* quiz */
  .q-text{font-size:14px}
  .opt-btn{font-size:13px;padding:9px 12px}
  .quiz-wrap{padding:10px}

  /* leaderboard */
  .lb-table{font-size:12px;padding-left:6px;padding-right:6px}
  .lb-row{padding:9px 10px;gap:8px}
  .lb-rank{width:26px;height:26px;font-size:10px;border-radius:6px}
  .lb-name{font-size:12px}
  .lb-score{font-size:12px;white-space:nowrap}
  #myRankBanner{flex-direction:row;flex-wrap:wrap;gap:8px!important}
}