/* ═══════════════════════════════════════════════
   EduBoard LMS — main.css
   ═══════════════════════════════════════════════ */

/* ── Variables ───────────────────────────────── */
:root {
  --primary:       #6366f1;
  --primary-dark:  #4f46e5;
  --primary-light: #a5b4fc;
  --success:       #22c55e;
  --warning:       #f59e0b;
  --danger:        #ef4444;
  --info:          #06b6d4;

  --bg:            #0f1117;
  --body-bg:       #0f1117;
  --card-bg:       #1a1d2e;
  --card-bg-2:     #1e2235;
  --bg-muted:      #252840;
  --border:        #2a2d45;
  --border-light:  #323656;

  --text:          #e2e8f0;
  --text-muted:    #8892b0;
  --text-faint:    #4a5568;

  --nav-h:         64px;
  --sidebar-w:     240px;
  --radius:        12px;
  --radius-sm:     8px;
  --shadow:        0 4px 24px rgba(0,0,0,0.35);
  --shadow-sm:     0 2px 8px rgba(0,0,0,0.2);
  --transition:    0.2s ease;
}

/* ── Reset ───────────────────────────────────── */
*, *::before, *::after { box-sizing:border-box; margin:0; padding:0; }
html { font-size:16px; scroll-behavior:smooth; }
body {
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  background:  var(--body-bg);
  color:       var(--text);
  line-height: 1.6;
  min-height:  100vh;
}
a  { color:var(--primary); text-decoration:none; }
a:hover { color:var(--primary-light); }
img { max-width:100%; display:block; }
ul, ol { list-style:none; }
input, select, textarea, button { font-family:inherit; font-size:inherit; }

/* ── Top Nav ─────────────────────────────────── */
.top-nav {
  position:   fixed;
  top:0; left:0; right:0;
  height:     var(--nav-h);
  background: var(--card-bg);
  border-bottom: 1px solid var(--border);
  display:    flex;
  align-items:center;
  justify-content:space-between;
  padding:    0 1.25rem;
  z-index:    1000;
  gap:        1rem;
}
.nav-left { display:flex; align-items:center; gap:0.75rem; }
.nav-right { display:flex; align-items:center; gap:0.75rem; }

.sidebar-toggle {
  display:flex; flex-direction:column; gap:5px; background:none;
  border:none; cursor:pointer; padding:6px; border-radius:6px;
}
.sidebar-toggle span {
  display:block; width:20px; height:2px;
  background:var(--text-muted); border-radius:2px; transition:var(--transition);
}
.sidebar-toggle:hover span { background:var(--text); }

.nav-brand {
  display:flex; align-items:center; gap:0.5rem; color:var(--text);
  font-weight:700; text-decoration:none;
}
.brand-icon  { font-size:1.25rem; }
.brand-logo  { height:32px; border-radius:6px; }
.brand-name  { font-size:1rem; }
.brand-role  {
  font-size:0.65rem; font-weight:600; letter-spacing:0.07em;
  background:rgba(99,102,241,0.15); color:var(--primary-light);
  padding:2px 8px; border-radius:20px; text-transform:uppercase;
}

.nav-search { position:relative; }
.nav-search-input {
  background: var(--bg-muted); border:1px solid var(--border);
  border-radius:8px; padding:0.4rem 2rem 0.4rem 0.75rem;
  color:var(--text); width:200px; font-size:0.85rem;
  transition:var(--transition);
}
.nav-search-input:focus { outline:none; border-color:var(--primary); width:260px; }
.nav-search-icon { position:absolute; right:0.6rem; top:50%; transform:translateY(-50%); pointer-events:none; }

.nav-icon-btn {
  font-size:1.2rem; padding:0.3rem; border-radius:8px;
  color:var(--text-muted); transition:var(--transition); text-decoration:none;
}
.nav-icon-btn:hover { background:var(--bg-muted); color:var(--text); }

.nav-user {
  display:flex; align-items:center; gap:0.5rem; cursor:pointer;
  padding:0.4rem 0.75rem; border-radius:8px; transition:var(--transition);
  position:relative;
}
.nav-user:hover { background:var(--bg-muted); }
.nav-avatar {
  width:34px; height:34px; border-radius:50%;
  background:linear-gradient(135deg,var(--primary),var(--primary-dark));
  display:flex; align-items:center; justify-content:center;
  font-weight:700; font-size:0.85rem; color:#fff; flex-shrink:0;
}
.nav-name    { font-size:0.875rem; font-weight:500; }
.nav-chevron { font-size:0.7rem; color:var(--text-muted); }

/* User Dropdown */
.user-dropdown {
  position:absolute; top:calc(100% + 8px); right:0;
  background:var(--card-bg); border:1px solid var(--border);
  border-radius:var(--radius); min-width:220px;
  box-shadow:var(--shadow); z-index:999;
  display:none; animation:fadeDown 0.15s ease;
}
.user-dropdown.open { display:block; }
@keyframes fadeDown { from{opacity:0;transform:translateY(-8px)} to{opacity:1;transform:translateY(0)} }
.ud-header { display:flex; gap:0.75rem; align-items:center; padding:1rem; }
.ud-avatar { width:40px; height:40px; border-radius:50%; background:linear-gradient(135deg,var(--primary),var(--primary-dark)); display:flex; align-items:center; justify-content:center; font-weight:700; color:#fff; flex-shrink:0; }
.ud-name  { font-weight:600; font-size:0.9rem; }
.ud-email { font-size:0.75rem; color:var(--text-muted); }
.ud-role  { display:inline-block; margin-top:2px; font-size:0.65rem; font-weight:700; background:rgba(99,102,241,0.15); color:var(--primary-light); padding:1px 7px; border-radius:20px; text-transform:uppercase; }
.ud-divider { height:1px; background:var(--border); }
.ud-item { display:flex; align-items:center; gap:0.6rem; padding:0.6rem 1rem; font-size:0.875rem; color:var(--text); transition:var(--transition); }
.ud-item:hover { background:var(--bg-muted); color:var(--primary-light); }
.ud-logout:hover { color:var(--danger); }

/* ── Sidebar ─────────────────────────────────── */
.sidebar {
  position:fixed; top:var(--nav-h); left:0; bottom:0;
  width:var(--sidebar-w); background:var(--card-bg);
  border-right:1px solid var(--border);
  overflow-y:auto; z-index:900;
  transition:transform var(--transition);
}
.sidebar.collapsed { transform:translateX(-100%); }
.sidebar-inner { display:flex; flex-direction:column; height:100%; padding:1rem 0; }

.sidebar-nav { flex:1; }
.nav-section { margin-bottom:0.25rem; padding:0 0.75rem; }
.nav-section-label {
  display:block; font-size:0.65rem; font-weight:700; letter-spacing:0.1em;
  text-transform:uppercase; color:var(--text-faint); padding:0.6rem 0.5rem 0.3rem;
}
.nav-item {
  display:flex; align-items:center; gap:0.65rem;
  padding:0.55rem 0.75rem; border-radius:var(--radius-sm);
  color:var(--text-muted); font-size:0.875rem; font-weight:500;
  transition:var(--transition); cursor:pointer; text-decoration:none;
  margin-bottom:1px;
}
.nav-item:hover  { background:var(--bg-muted); color:var(--text); }
.nav-item.active { background:rgba(99,102,241,0.15); color:var(--primary-light); }
.nav-item.active .nav-icon { filter:none; }
.nav-icon  { font-size:1rem; flex-shrink:0; }
.nav-label { flex:1; }
.nav-logout:hover { color:var(--danger); }

.sidebar-footer {
  padding:1rem; border-top:1px solid var(--border);
  font-size:0.72rem; color:var(--text-faint);
}
.sf-version { font-weight:600; }

/* ── Admin Layout ────────────────────────────── */
.admin-body { padding-top:var(--nav-h); }
.admin-layout {
  display:flex; min-height:calc(100vh - var(--nav-h));
}
.admin-main {
  flex:1; margin-left:var(--sidebar-w);
  padding:1.75rem 2rem;
  max-width:100%;
  transition:margin-left var(--transition);
}
.admin-main.expanded { margin-left:0; }

/* ── Page Header ─────────────────────────────── */
.page-header {
  display:flex; align-items:flex-start; justify-content:space-between;
  gap:1rem; flex-wrap:wrap; margin-bottom:1.5rem;
}
.page-title { font-size:1.5rem; font-weight:800; color:var(--text); line-height:1.2; }
.page-sub   { font-size:0.875rem; color:var(--text-muted); margin-top:0.2rem; }

/* ── Cards ───────────────────────────────────── */
.card {
  background:var(--card-bg); border:1px solid var(--border);
  border-radius:var(--radius); overflow:hidden;
}
.card-header {
  display:flex; align-items:center; justify-content:space-between;
  padding:1rem 1.25rem; border-bottom:1px solid var(--border);
  flex-wrap:wrap; gap:0.5rem;
}
.card-title  { font-size:1rem; font-weight:700; margin:0; }
.card-action { font-size:0.8rem; color:var(--primary); }
.card-body   { padding:1.25rem; }
.card-body.p0 { padding:0; }
.header-actions { display:flex; gap:0.5rem; flex-wrap:wrap; align-items:center; }

/* ── Stats Grid ──────────────────────────────── */
.stats-grid {
  display:grid;
  grid-template-columns: repeat(auto-fill, minmax(170px,1fr));
  gap:1rem; margin-bottom:1.5rem;
}
.stat-card {
  background:var(--card-bg); border:1px solid var(--border);
  border-radius:var(--radius); padding:1.25rem;
  display:flex; align-items:center; gap:1rem;
  transition:var(--transition);
}
.stat-card:hover { transform:translateY(-2px); box-shadow:var(--shadow-sm); }
.stat-icon { font-size:2rem; flex-shrink:0; }
.stat-num  { display:block; font-size:1.75rem; font-weight:800; line-height:1; }
.stat-label{ display:block; font-size:0.75rem; color:var(--text-muted); margin-top:3px; }

.stat-green  { border-left:3px solid var(--success); }
.stat-blue   { border-left:3px solid #3b82f6; }
.stat-purple { border-left:3px solid #a855f7; }
.stat-orange { border-left:3px solid var(--warning); }
.stat-teal   { border-left:3px solid var(--info); }
.stat-red    { border-left:3px solid var(--danger); }

/* ── Tables ──────────────────────────────────── */
.table { width:100%; border-collapse:collapse; font-size:0.875rem; }
.table th {
  padding:0.75rem 1rem; text-align:left; font-size:0.75rem;
  font-weight:700; letter-spacing:0.05em; text-transform:uppercase;
  color:var(--text-muted); background:var(--bg-muted);
  border-bottom:1px solid var(--border);
}
.table td { padding:0.875rem 1rem; border-bottom:1px solid var(--border); vertical-align:middle; }
.table tbody tr:last-child td { border-bottom:none; }
.table-hover tbody tr:hover { background:var(--bg-muted); }

.td-name { font-weight:600; font-size:0.875rem; }
.td-sub  { font-size:0.75rem; color:var(--text-muted); margin-top:1px; }

/* ── Badges ──────────────────────────────────── */
.badge {
  display:inline-flex; align-items:center; gap:3px;
  padding:2px 9px; border-radius:20px;
  font-size:0.72rem; font-weight:700; white-space:nowrap;
}
.badge-primary { background:rgba(99,102,241,0.15); color:var(--primary-light); }
.badge-success { background:rgba(34,197,94,0.12);  color:#4ade80; }
.badge-warning { background:rgba(245,158,11,0.15); color:#fbbf24; }
.badge-danger  { background:rgba(239,68,68,0.12);  color:#f87171; }
.badge-info    { background:rgba(6,182,212,0.12);  color:#22d3ee; }
.badge-muted   { background:var(--bg-muted);       color:var(--text-muted); }

.badge-type-mcq   { background:rgba(59,130,246,0.12);  color:#60a5fa; }
.badge-type-short { background:rgba(34,197,94,0.12);   color:#4ade80; }
.badge-type-long  { background:rgba(168,85,247,0.12);  color:#c084fc; }

.badge-role-student       { background:rgba(99,102,241,0.12);  color:var(--primary-light); }
.badge-role-teacher       { background:rgba(245,158,11,0.12);  color:#fbbf24; }
.badge-role-college_admin { background:rgba(6,182,212,0.12);   color:#22d3ee; }

/* ── Buttons ─────────────────────────────────── */
.btn {
  display:inline-flex; align-items:center; gap:0.4rem;
  padding:0.5rem 1.1rem; border-radius:var(--radius-sm);
  font-size:0.875rem; font-weight:600; cursor:pointer;
  border:none; transition:var(--transition); text-decoration:none;
  white-space:nowrap; line-height:1.5;
}
.btn:disabled { opacity:0.5; cursor:not-allowed; }
.btn-primary  { background:var(--primary); color:#fff; }
.btn-primary:hover  { background:var(--primary-dark); color:#fff; }
.btn-outline  { background:transparent; color:var(--text); border:1px solid var(--border); }
.btn-outline:hover { background:var(--bg-muted); color:var(--text); border-color:var(--primary); }
.btn-ghost    { background:transparent; color:var(--text-muted); }
.btn-ghost:hover { color:var(--text); background:var(--bg-muted); }
.btn-success  { background:var(--success); color:#fff; }
.btn-success:hover { background:#16a34a; color:#fff; }
.btn-warning  { background:var(--warning); color:#000; }
.btn-warning:hover { background:#d97706; }
.btn-danger   { background:var(--danger); color:#fff; }
.btn-danger:hover { background:#dc2626; color:#fff; }

.btn-sm  { padding:0.3rem 0.75rem; font-size:0.8rem; }
.btn-xs  { padding:0.2rem 0.5rem;  font-size:0.72rem; }
.btn-lg  { padding:0.7rem 1.5rem;  font-size:0.95rem; }
.btn-block { width:100%; justify-content:center; }

/* ── Forms ───────────────────────────────────── */
.form-group   { display:flex; flex-direction:column; gap:0.4rem; }
.form-group label { font-size:0.85rem; font-weight:600; color:var(--text); }
.form-control {
  background:var(--bg-muted); border:1px solid var(--border);
  border-radius:var(--radius-sm); padding:0.6rem 0.85rem;
  color:var(--text); font-size:0.875rem; width:100%;
  transition:border-color var(--transition);
}
.form-control:focus { outline:none; border-color:var(--primary); background:var(--card-bg-2); }
.form-control::placeholder { color:var(--text-faint); }
textarea.form-control { resize:vertical; min-height:80px; }
.form-select { cursor:pointer; }
.form-hint   { font-size:0.75rem; color:var(--text-muted); }
.req         { color:var(--danger); }

.form-grid-2 { display:grid; grid-template-columns:1fr 1fr; gap:1rem; }
.form-grid-3 { display:grid; grid-template-columns:1fr 1fr 1fr; gap:1rem; }
@media(max-width:640px) {
  .form-grid-2, .form-grid-3 { grid-template-columns:1fr; }
}

.input-icon-wrap { position:relative; }
.input-icon-wrap .form-control { padding-right:2.5rem; }
.toggle-pass {
  position:absolute; right:0.6rem; top:50%; transform:translateY(-50%);
  background:none; border:none; cursor:pointer; color:var(--text-muted); font-size:1rem; padding:0;
}
.toggle-pass:hover { color:var(--text); }

.form-actions { display:flex; gap:0.75rem; flex-wrap:wrap; align-items:center; }

.form-card-layout {
  display:grid; grid-template-columns:1fr 300px; gap:1.5rem; align-items:start;
}
@media(max-width:960px) { .form-card-layout { grid-template-columns:1fr; } }
.form-main, .form-sidebar { display:flex; flex-direction:column; gap:1rem; }

/* ── Filter Form ─────────────────────────────── */
.filter-form {
  display:flex; gap:0.75rem; flex-wrap:wrap; align-items:flex-end;
}
.filter-form .form-control { max-width:220px; }
@media(max-width:640px) { .filter-form .form-control { max-width:100%; } }

/* ── Alerts ──────────────────────────────────── */
.alert {
  display:flex; align-items:flex-start; gap:0.75rem;
  padding:1rem 1.1rem; border-radius:var(--radius-sm); margin-bottom:1rem;
  border:1px solid;
}
.alert-icon { font-size:1rem; flex-shrink:0; margin-top:1px; font-weight:700; }
.alert ul   { margin:0; padding-left:1.1rem; list-style:disc; }
.alert li   { font-size:0.875rem; }
.alert-error   { background:rgba(239,68,68,0.08);   border-color:rgba(239,68,68,0.25);   color:#f87171; }
.alert-success { background:rgba(34,197,94,0.08);   border-color:rgba(34,197,94,0.25);   color:#4ade80; }
.alert-warning { background:rgba(245,158,11,0.08);  border-color:rgba(245,158,11,0.25);  color:#fbbf24; }
.alert-info    { background:rgba(6,182,212,0.08);   border-color:rgba(6,182,212,0.25);   color:#22d3ee; }

/* ── Empty State ─────────────────────────────── */
.empty-state {
  display:flex; flex-direction:column; align-items:center;
  justify-content:center; gap:0.5rem;
  padding:3rem 1rem; color:var(--text-muted); text-align:center;
}
.empty-icon { font-size:3rem; }
.empty-state p { font-size:0.9rem; }
.empty-state a { color:var(--primary); }

/* ── Pagination ──────────────────────────────── */
.pagination {
  display:flex; align-items:center; justify-content:center;
  gap:0.35rem; padding:1.25rem; flex-wrap:wrap;
}
.page-btn {
  display:inline-flex; align-items:center; justify-content:center;
  min-width:36px; height:36px; padding:0 0.75rem;
  border-radius:var(--radius-sm); font-size:0.85rem; font-weight:600;
  border:1px solid var(--border); background:var(--card-bg); color:var(--text);
  transition:var(--transition); text-decoration:none;
}
.page-btn:hover    { background:var(--bg-muted); border-color:var(--primary); color:var(--text); }
.page-btn.active   { background:var(--primary); border-color:var(--primary); color:#fff; }
.page-btn.disabled { opacity:0.4; pointer-events:none; }

/* ── Grid helpers ────────────────────────────── */
.grid-2col { display:grid; grid-template-columns:1fr 1fr; gap:1.5rem; }
@media(max-width:860px) { .grid-2col { grid-template-columns:1fr; } }

/* ── Count Badge ─────────────────────────────── */
.count-badge {
  display:inline-flex; align-items:center; justify-content:center;
  min-width:28px; height:24px; padding:0 0.5rem;
  background:var(--bg-muted); border-radius:20px;
  font-size:0.78rem; font-weight:700; color:var(--text);
}

/* ── Action buttons group ────────────────────── */
.action-btns { display:flex; gap:0.35rem; align-items:center; flex-wrap:wrap; }

/* ── Context Banner ──────────────────────────── */
.context-banner {
  background:rgba(99,102,241,0.08); border:1px solid rgba(99,102,241,0.2);
  border-radius:var(--radius-sm); padding:0.6rem 1rem; font-size:0.85rem;
  color:var(--text-muted);
}

/* ── Quick Actions ───────────────────────────── */
.quick-actions { display:grid; grid-template-columns:repeat(auto-fill,minmax(120px,1fr)); gap:0.75rem; }
.qa-btn {
  display:flex; flex-direction:column; align-items:center; gap:0.4rem;
  padding:1rem 0.5rem; border:1px solid var(--border); border-radius:var(--radius);
  background:var(--bg-muted); color:var(--text); text-decoration:none;
  transition:var(--transition); text-align:center; cursor:pointer; font-size:0.8rem; font-weight:600;
}
.qa-btn:hover { border-color:var(--primary); background:rgba(99,102,241,0.08); color:var(--primary-light); }
.qa-icon { font-size:1.5rem; }

/* ── Tip List ────────────────────────────────── */
.tip-list { padding-left:1.1rem; list-style:disc; display:flex; flex-direction:column; gap:0.4rem; }
.tip-list li { font-size:0.82rem; color:var(--text-muted); }

/* ── Utilities ───────────────────────────────── */
.text-muted   { color:var(--text-muted); }
.text-sm      { font-size:0.825rem; }
.text-xs      { font-size:0.72rem; }
.text-center  { text-align:center; }
.text-right   { text-align:right; }
.mt-1 { margin-top:0.75rem; }
.mt-2 { margin-top:1.5rem; }
.mb-1 { margin-bottom:0.75rem; }
.mb-2 { margin-bottom:1.5rem; }
.p0   { padding:0 !important; }
.hidden { display:none !important; }

/* ── Scrollbar ───────────────────────────────── */
::-webkit-scrollbar       { width:6px; height:6px; }
::-webkit-scrollbar-track { background:transparent; }
::-webkit-scrollbar-thumb { background:var(--border-light); border-radius:3px; }
::-webkit-scrollbar-thumb:hover { background:var(--text-faint); }

/* ── Responsive ──────────────────────────────── */
@media(max-width:768px) {
  .sidebar { transform:translateX(-100%); }
  .sidebar.open { transform:translateX(0); }
  .admin-main { margin-left:0; padding:1rem; }
  .page-header { flex-direction:column; }
  .page-title  { font-size:1.2rem; }
  .stats-grid  { grid-template-columns:repeat(2,1fr); }
  .table th, .table td { padding:0.6rem 0.7rem; }
}
@media(max-width:480px) {
  .stats-grid { grid-template-columns:1fr; }
  .nav-search { display:none; }
}