/* ============================================================
   Skillbits LMS ERP — Admin/Portal UI v3.0
   Brand: Green #4db848 · Blue #29abe2 · Glassmorphism sidebar
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap');

:root {
  --sb-green:        #4db848;
  --sb-green-dark:   #3d9939;
  --sb-green-light:  rgba(77,184,72,.15);
  --sb-blue:         #29abe2;
  --sb-blue-dark:    #1a8fc4;
  --sb-blue-light:   rgba(41,171,226,.15);
  --sb-sidebar-w:    270px;
  --sb-topbar-h:     62px;
  --sb-bg:           #f0f4f8;
  --sb-card:         #ffffff;
  --sb-border:       #e2e8f0;
  --sb-text:         #1e293b;
  --sb-muted:        #64748b;
  --sb-shadow:       0 1px 3px rgba(0,0,0,.06), 0 4px 16px rgba(0,0,0,.04);
  --sb-shadow-lg:    0 8px 32px rgba(0,0,0,.1);
  --sb-radius:       10px;
  --sb-radius-sm:    6px;
  /* Legacy compat */
  --sb-accent:       var(--sb-green);
  --sb-accent-dark:  var(--sb-green-dark);
  --sb-success:      #22c55e;
  --sb-warning:      #f59e0b;
  --sb-danger:       #ef4444;
  --sb-info:         var(--sb-blue);
}

/* ── Base ─────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; }
html { height: 100%; }
body {
  margin: 0;
  min-height: 100vh;
  font-family: 'Inter', 'Segoe UI', system-ui, sans-serif;
  background: var(--sb-bg);
  color: var(--sb-text);
  font-size: 15px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* ── Layout ──────────────────────────────────────────────── */
.sb-body { display: flex; min-height: 100vh; width: 100%; }
.sb-main { flex: 1; margin-left: var(--sb-sidebar-w); min-width: 0; display: flex; flex-direction: column; transition: margin-left .25s; }
.sb-content { padding: 1.75rem 2rem; flex: 1; }

/* ═══════════════════════════════════════════════════════════
   SIDEBAR — Glassmorphism with brand gradient
   ═══════════════════════════════════════════════════════════ */
.sb-sidebar {
  width: var(--sb-sidebar-w);
  flex-shrink: 0;
  position: fixed;
  top: 0; left: 0; bottom: 0;
  z-index: 1040;
  display: flex;
  flex-direction: column;
  transition: transform .25s cubic-bezier(.4,0,.2,1);
  overflow: hidden;

  /* Brand gradient base */
  background: linear-gradient(160deg, #0f1923 0%, #0d2318 40%, #0a1f2e 100%);
}

/* Glassmorphism overlay */
.sb-sidebar::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 20% 20%, rgba(77,184,72,.18) 0%, transparent 50%),
    radial-gradient(circle at 80% 80%, rgba(41,171,226,.15) 0%, transparent 50%);
  pointer-events: none;
  z-index: 0;
}
.sb-sidebar > * { position: relative; z-index: 1; }

.sb-sidebar.collapsed { transform: translateX(calc(-1 * var(--sb-sidebar-w))); }

/* ── Brand / Logo area ────────────────────────────────────── */
.sb-brand {
  padding: 1.1rem 1.25rem;
  border-bottom: 1px solid rgba(255,255,255,.08);
  flex-shrink: 0;
  display: flex;
  align-items: center;
  gap: .75rem;
  min-height: var(--sb-topbar-h);
}
.sb-brand-logo img {
  height: 38px;
  width: auto;
  object-fit: contain;
  filter: brightness(1.1);
}
.sb-brand-logo-fallback {
  display: flex;
  align-items: center;
  gap: .4rem;
  font-size: 1.1rem;
  font-weight: 800;
  letter-spacing: -.02em;
}
.sb-brand-logo-fallback .part-green { color: var(--sb-green); }
.sb-brand-logo-fallback .part-blue  { color: var(--sb-blue); }
.sb-brand-tagline {
  font-size: .6rem;
  color: rgba(255,255,255,.35);
  text-transform: uppercase;
  letter-spacing: .08em;
  margin-top: .1rem;
}

/* ── User panel ───────────────────────────────────────────── */
.sb-user {
  display: flex;
  align-items: center;
  gap: .75rem;
  padding: .9rem 1.25rem;
  background: rgba(255,255,255,.04);
  border-bottom: 1px solid rgba(255,255,255,.06);
  flex-shrink: 0;
  backdrop-filter: blur(10px);
}
.sb-user .name  { font-size: .825rem; font-weight: 600; color: #fff; line-height: 1.3; }
.sb-user .role  { font-size: .65rem; color: rgba(255,255,255,.4); text-transform: uppercase; letter-spacing: .06em; }

/* ── Avatar ───────────────────────────────────────────────── */
.sb-avatar {
  width: 36px; height: 36px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--sb-green), var(--sb-blue));
  color: #fff;
  font-weight: 700; font-size: .875rem;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0; overflow: hidden;
  box-shadow: 0 0 0 2px rgba(255,255,255,.15);
}
.sb-avatar img { width: 100%; height: 100%; object-fit: cover; }

/* ── Nav ──────────────────────────────────────────────────── */
.sb-nav {
  flex: 1;
  overflow-y: auto;
  padding: .75rem 0;
  scrollbar-width: thin;
  scrollbar-color: rgba(255,255,255,.1) transparent;
}
.sb-nav::-webkit-scrollbar { width: 3px; }
.sb-nav::-webkit-scrollbar-thumb { background: rgba(255,255,255,.12); border-radius: 2px; }

.nav-section {
  font-size: .6rem;
  font-weight: 700;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: rgba(255,255,255,.3);
  padding: 1rem 1.25rem .3rem;
  margin-top: .25rem;
}

.nav-item { list-style: none; padding: 0 .6rem; margin-bottom: .15rem; }
.nav-link {
  display: flex;
  align-items: center;
  gap: .7rem;
  padding: .65rem .85rem;
  color: rgba(255,255,255,.65) !important;
  text-decoration: none;
  border-radius: var(--sb-radius-sm);
  font-size: .85rem;
  font-weight: 500;
  transition: all .18s;
  position: relative;
}
.nav-link i { font-size: 1rem; flex-shrink: 0; transition: transform .18s; }
.nav-link:hover {
  color: #fff !important;
  background: rgba(255,255,255,.07);
}
.nav-link:hover i { transform: translateX(2px); }

/* Active — green glow */
.nav-link.active {
  background: linear-gradient(90deg, rgba(77,184,72,.25), rgba(77,184,72,.08)) !important;
  color: #fff !important;
  font-weight: 600;
  box-shadow: inset 3px 0 0 var(--sb-green);
}
.nav-link.active i { color: var(--sb-green); }

/* Badge in nav */
.nav-badge {
  margin-left: auto;
  background: var(--sb-green);
  color: #fff;
  font-size: .6rem;
  font-weight: 700;
  padding: .1rem .4rem;
  border-radius: 100px;
  line-height: 1.4;
}

/* Sidebar footer */
.sb-sidebar-footer {
  padding: .85rem 1.25rem;
  border-top: 1px solid rgba(255,255,255,.06);
  flex-shrink: 0;
}
.sb-sidebar-footer a {
  display: flex;
  align-items: center;
  gap: .6rem;
  color: rgba(255,255,255,.45);
  font-size: .8rem;
  text-decoration: none;
  padding: .4rem .5rem;
  border-radius: var(--sb-radius-sm);
  transition: all .18s;
}
.sb-sidebar-footer a:hover { color: var(--sb-danger); background: rgba(239,68,68,.1); }

/* ═══════════════════════════════════════════════════════════
   CARDS
   ═══════════════════════════════════════════════════════════ */
.card {
  background: var(--sb-card);
  border: 1px solid var(--sb-border) !important;
  border-radius: var(--sb-radius) !important;
  box-shadow: var(--sb-shadow);
}
.card-header {
  background: #fff !important;
  border-bottom: 1px solid var(--sb-border) !important;
  border-radius: var(--sb-radius) var(--sb-radius) 0 0 !important;
  padding: 1rem 1.25rem !important;
}
.card-footer {
  background: var(--sb-bg) !important;
  border-top: 1px solid var(--sb-border) !important;
  padding: .75rem 1.25rem !important;
}

/* ── Stat cards ───────────────────────────────────────────── */
.stat-card {
  border-radius: var(--sb-radius);
  padding: 1.25rem 1.5rem;
  color: #fff;
  display: flex;
  align-items: center;
  gap: 1rem;
  box-shadow: 0 4px 20px rgba(0,0,0,.12);
  position: relative;
  overflow: hidden;
}
.stat-card::after {
  content: '';
  position: absolute;
  right: -20px; bottom: -20px;
  width: 80px; height: 80px;
  border-radius: 50%;
  background: rgba(255,255,255,.08);
}
.stat-icon { font-size: 1.75rem; opacity: .9; flex-shrink: 0; }
.stat-value { font-size: 1.65rem; font-weight: 800; line-height: 1; letter-spacing: -.02em; }
.stat-label { font-size: .72rem; opacity: .8; text-transform: uppercase; letter-spacing: .06em; margin-top: .2rem; }
.stat-change { font-size: .72rem; opacity: .7; margin-top: .15rem; }

/* ═══════════════════════════════════════════════════════════
   TABLES
   ═══════════════════════════════════════════════════════════ */
.table { font-size: .875rem; color: var(--sb-text); margin: 0; }
.table thead th {
  background: var(--sb-bg);
  font-size: .7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .07em;
  color: var(--sb-muted);
  border-bottom: 1px solid var(--sb-border) !important;
  padding: .85rem 1rem;
  border-top: none;
  white-space: nowrap;
}
.table tbody td {
  padding: .85rem 1rem;
  border-color: var(--sb-border);
  vertical-align: middle;
}
.table-hover tbody tr:hover { background: rgba(77,184,72,.04); }

/* ═══════════════════════════════════════════════════════════
   BUTTONS
   ═══════════════════════════════════════════════════════════ */
.btn-accent {
  background: var(--sb-green);
  color: #fff !important;
  border: none;
  border-radius: var(--sb-radius-sm);
  font-weight: 600;
  font-size: .85rem;
  padding: .55rem 1.1rem;
  transition: all .18s;
  display: inline-flex; align-items: center; gap: .4rem;
}
.btn-accent:hover { background: var(--sb-green-dark); transform: translateY(-1px); box-shadow: 0 4px 12px rgba(77,184,72,.3); }

.btn-blue-accent {
  background: var(--sb-blue);
  color: #fff !important;
  border: none;
  border-radius: var(--sb-radius-sm);
  font-weight: 600;
  font-size: .85rem;
  padding: .55rem 1.1rem;
  transition: all .18s;
}
.btn-blue-accent:hover { background: var(--sb-blue-dark); transform: translateY(-1px); }

/* ═══════════════════════════════════════════════════════════
   FORMS
   ═══════════════════════════════════════════════════════════ */
.form-control, .form-select {
  font-family: inherit;
  font-size: .875rem;
  border: 1.5px solid var(--sb-border);
  border-radius: var(--sb-radius-sm);
  padding: .55rem .85rem;
  transition: border-color .2s, box-shadow .2s;
  color: var(--sb-text);
  background-color: #fff;
}
.form-control:focus, .form-select:focus {
  border-color: var(--sb-green);
  box-shadow: 0 0 0 3px rgba(77,184,72,.1);
  outline: none;
}
.form-label {
  font-size: .8rem;
  font-weight: 600;
  color: var(--sb-text);
  margin-bottom: .35rem;
}
.form-label.required::after { content: ' *'; color: var(--sb-danger); }
.form-text { font-size: .75rem; color: var(--sb-muted); margin-top: .25rem; }

/* ═══════════════════════════════════════════════════════════
   BADGES
   ═══════════════════════════════════════════════════════════ */
.badge { font-size: .7rem; font-weight: 600; padding: .3rem .6rem; border-radius: var(--sb-radius-sm); }
.bg-success { background: rgba(34,197,94,.15) !important; color: #15803d !important; }
.bg-danger  { background: rgba(239,68,68,.12) !important; color: #b91c1c !important; }
.bg-warning { background: rgba(245,158,11,.12) !important; color: #92400e !important; }
.bg-info    { background: var(--sb-blue-light) !important; color: var(--sb-blue-dark) !important; }
.bg-secondary { background: #f1f5f9 !important; color: #64748b !important; }
.bg-primary { background: rgba(77,184,72,.15) !important; color: var(--sb-green-dark) !important; }

/* ═══════════════════════════════════════════════════════════
   ALERTS
   ═══════════════════════════════════════════════════════════ */
.alert { border: none; border-radius: var(--sb-radius); font-size: .875rem; }
.alert-success { background: rgba(34,197,94,.1); color: #15803d; }
.alert-danger   { background: rgba(239,68,68,.08); color: #b91c1c; }
.alert-warning  { background: rgba(245,158,11,.1); color: #92400e; }
.alert-info     { background: var(--sb-blue-light); color: var(--sb-blue-dark); }

/* Flash message */
.flash-message {
  position: fixed;
  top: 76px; right: 1.5rem;
  z-index: 9999;
  min-width: 300px;
  max-width: 440px;
  animation: slideInRight .3s ease;
}
@keyframes slideInRight { from { opacity:0; transform:translateX(30px); } to { opacity:1; transform:none; } }

/* ═══════════════════════════════════════════════════════════
   PROGRESS BARS
   ═══════════════════════════════════════════════════════════ */
.progress { background: var(--sb-border); border-radius: 100px; }
.progress-bar { border-radius: 100px; }

/* ═══════════════════════════════════════════════════════════
   MODALS
   ═══════════════════════════════════════════════════════════ */
.modal-content { border: none; border-radius: var(--sb-radius); box-shadow: var(--sb-shadow-lg); }
.modal-header { border-bottom: 1px solid var(--sb-border); padding: 1.25rem 1.5rem; }
.modal-footer { border-top: 1px solid var(--sb-border); padding: 1rem 1.5rem; }
.modal-title { font-weight: 700; font-size: 1rem; }

/* ═══════════════════════════════════════════════════════════
   MISC UI
   ═══════════════════════════════════════════════════════════ */
.text-accent { color: var(--sb-green) !important; }
.bg-accent   { background: var(--sb-green) !important; }
.border-accent { border-color: var(--sb-green) !important; }
hr { border-color: var(--sb-border); opacity: 1; }
code { background: var(--sb-bg); padding: .15rem .4rem; border-radius: 4px; font-size: .825rem; color: var(--sb-blue-dark); }

/* Dropdown */
.dropdown-menu { border: 1px solid var(--sb-border); border-radius: var(--sb-radius); box-shadow: var(--sb-shadow-lg); padding: .4rem; }
.dropdown-item { border-radius: var(--sb-radius-sm); font-size: .85rem; padding: .55rem .85rem; color: var(--sb-text); }
.dropdown-item:hover { background: var(--sb-bg); color: var(--sb-green); }
.dropdown-header { font-size: .72rem; font-weight: 700; text-transform: uppercase; letter-spacing: .06em; color: var(--sb-muted); padding: .5rem .85rem .25rem; }

/* Accordion */
.accordion-button:not(.collapsed) { background: var(--sb-green-light); color: var(--sb-green-dark); box-shadow: none; }
.accordion-button:focus { box-shadow: 0 0 0 3px rgba(77,184,72,.12); }

/* Pagination */
.page-link { border-color: var(--sb-border); color: var(--sb-text); font-size: .8rem; padding: .4rem .7rem; }
.page-item.active .page-link { background: var(--sb-green); border-color: var(--sb-green); }
.page-link:focus { box-shadow: 0 0 0 3px rgba(77,184,72,.12); }

/* List group */
.list-group-item { border-color: var(--sb-border); font-size: .875rem; }
.list-group-item-action:hover { background: rgba(77,184,72,.04); }

/* Tabs */
.nav-tabs { border-bottom: 1px solid var(--sb-border); }
.nav-tabs .nav-link { color: var(--sb-muted); border: none; border-bottom: 2px solid transparent; border-radius: 0; padding: .65rem 1rem; font-size: .875rem; font-weight: 500; }
.nav-tabs .nav-link.active { color: var(--sb-green); border-bottom-color: var(--sb-green); background: none; font-weight: 600; }
.nav-tabs .nav-link:hover:not(.active) { color: var(--sb-text); }

/* ═══════════════════════════════════════════════════════════
   RESPONSIVE
   ═══════════════════════════════════════════════════════════ */
@media (max-width: 992px) {
  .sb-sidebar { transform: translateX(calc(-1 * var(--sb-sidebar-w))); }
  .sb-sidebar.open { transform: translateX(0); }
  .sb-main { margin-left: 0; }
  .sb-content { padding: 1.25rem 1rem; }
  .sb-overlay { position: fixed; inset: 0; background: rgba(0,0,0,.5); z-index: 1039; display: none; }
  .sb-overlay.show { display: block; }
}