/* ============================================================
   Moodle Dashboard Demo — Dark Theme
   ============================================================ */

:root {
  --bg-base:        #0c0c0e;
  --bg-surface:     #13131a;
  --bg-card:        #1a1a24;
  --bg-card-hover:  #20202e;
  --bg-input:       #16161f;
  --border:         #2a2a3d;
  --border-light:   #34344a;
  --text-primary:   #f0f0f8;
  --text-secondary: #9898b8;
  --text-muted:     #60607a;
  --accent:         #6366f1;
  --accent-light:   #818cf8;
  --accent-dim:     rgba(99,102,241,0.12);
  --accent-glow:    rgba(99,102,241,0.25);
  --success:        #22c55e;
  --success-dim:    rgba(34,197,94,0.12);
  --warning:        #f59e0b;
  --warning-dim:    rgba(245,158,11,0.12);
  --danger:         #ef4444;
  --danger-dim:     rgba(239,68,68,0.12);
  --info:           #38bdf8;
  --info-dim:       rgba(56,189,248,0.12);
  --radius-sm:      6px;
  --radius-md:      10px;
  --radius-lg:      14px;
  --shadow-card:    0 4px 24px rgba(0,0,0,0.4);
  --topbar-height:  60px;
  --sidebar-width:  0px;
  --font-mono:      'JetBrains Mono', 'Fira Code', 'Consolas', monospace;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { font-size: 15px; scroll-behavior: smooth; }

body {
  font-family: ui-sans-serif, system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg-base);
  color: var(--text-primary);
  min-height: 100vh;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent-light); text-decoration: none; }
a:hover { color: var(--text-primary); }

/* ============================================================
   SCROLLBAR
   ============================================================ */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: var(--bg-base); }
::-webkit-scrollbar-thumb { background: var(--border-light); border-radius: 3px; }

/* ============================================================
   LOGIN PAGE
   ============================================================ */
.login-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem;
  background: var(--bg-base);
  background-image: radial-gradient(ellipse at 20% 50%, rgba(99,102,241,0.06) 0%, transparent 60%),
                    radial-gradient(ellipse at 80% 20%, rgba(56,189,248,0.04) 0%, transparent 50%);
}

.login-card {
  width: 100%;
  max-width: 400px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2.5rem 2rem;
  box-shadow: var(--shadow-card), 0 0 0 1px rgba(99,102,241,0.05);
}

.login-logo {
  text-align: center;
  margin-bottom: 2rem;
}

.login-logo .logo-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  background: var(--accent-dim);
  border: 1px solid var(--accent-glow);
  border-radius: var(--radius-md);
  margin-bottom: 0.75rem;
}

.login-logo .logo-icon svg {
  width: 26px;
  height: 26px;
  fill: none;
  stroke: var(--accent-light);
  stroke-width: 1.8;
}

.login-logo h1 {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-primary);
  letter-spacing: -0.01em;
}

.login-logo p {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 0.2rem;
}

.login-card h2 {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.4rem;
  letter-spacing: -0.02em;
}

.login-card .subtitle {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 1.75rem;
}

.form-group {
  margin-bottom: 1.1rem;
}

.form-group label {
  display: block;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 0.4rem;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

.form-group input {
  width: 100%;
  padding: 0.6rem 0.85rem;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 0.9rem;
  outline: none;
  transition: border-color 0.15s, box-shadow 0.15s;
}

.form-group input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-dim);
}

.form-group input::placeholder { color: var(--text-muted); }

.btn-primary {
  width: 100%;
  padding: 0.65rem 1rem;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.15s, transform 0.1s;
  margin-top: 0.5rem;
}
.btn-primary:hover  { background: var(--accent-light); }
.btn-primary:active { transform: scale(0.98); }

.alert-error {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--danger-dim);
  border: 1px solid rgba(239,68,68,0.25);
  border-radius: var(--radius-sm);
  color: #fca5a5;
  font-size: 0.85rem;
  padding: 0.6rem 0.85rem;
  margin-bottom: 1.25rem;
}

.demo-hint {
  text-align: center;
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-top: 1.5rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--border);
}

.demo-hint code {
  font-family: var(--font-mono);
  background: var(--bg-input);
  padding: 0.1em 0.4em;
  border-radius: 4px;
  color: var(--text-secondary);
  font-size: 0.85em;
}

/* ============================================================
   TOPBAR
   ============================================================ */
.topbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--topbar-height);
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  padding: 0 1.5rem;
  gap: 1rem;
  z-index: 100;
  backdrop-filter: blur(8px);
}

.topbar-brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  flex-shrink: 0;
}

.topbar-brand .brand-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  background: var(--accent-dim);
  border: 1px solid var(--accent-glow);
  border-radius: 7px;
}

.topbar-brand .brand-icon svg {
  width: 17px;
  height: 17px;
  fill: none;
  stroke: var(--accent-light);
  stroke-width: 2;
}

.topbar-brand .brand-name {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-primary);
  letter-spacing: -0.01em;
  white-space: nowrap;
}

.topbar-divider {
  width: 1px;
  height: 24px;
  background: var(--border);
  flex-shrink: 0;
}

/* Tab navigation inside topbar */
.tab-nav {
  display: flex;
  align-items: center;
  gap: 0.15rem;
  flex: 1;
  overflow-x: auto;
  scrollbar-width: none;
}
.tab-nav::-webkit-scrollbar { display: none; }

.tab-btn {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.38rem 0.75rem;
  border: none;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--text-secondary);
  font-size: 0.82rem;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
  white-space: nowrap;
}

.tab-btn svg {
  width: 14px;
  height: 14px;
  flex-shrink: 0;
  stroke: currentColor;
  fill: none;
  stroke-width: 2;
}

.tab-btn:hover { background: var(--bg-card); color: var(--text-primary); }

.tab-btn.active {
  background: var(--accent-dim);
  color: var(--accent-light);
}

.topbar-right {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-shrink: 0;
}

.report-date {
  font-size: 0.75rem;
  color: var(--text-muted);
  white-space: nowrap;
}
.report-date span {
  color: var(--text-secondary);
  font-weight: 500;
}

.btn-logout {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.35rem 0.7rem;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-size: 0.78rem;
  cursor: pointer;
  transition: all 0.15s;
  white-space: nowrap;
  text-decoration: none;
}
.btn-logout svg { width: 13px; height: 13px; stroke: currentColor; fill: none; stroke-width: 2; }
.btn-logout:hover { border-color: var(--danger); color: var(--danger); background: var(--danger-dim); }

/* ============================================================
   MAIN CONTENT
   ============================================================ */
.main-content {
  margin-top: var(--topbar-height);
  padding: 1.75rem 1.5rem;
  max-width: 1600px;
  margin-left: auto;
  margin-right: auto;
}

/* ============================================================
   TAB PANELS
   ============================================================ */
.tab-panel { display: none; }
.tab-panel.active { display: block; }

.tab-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 1.5rem;
  gap: 1rem;
}

.tab-header h2 {
  font-size: 1.2rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}
.tab-header p {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-top: 0.2rem;
}

/* ============================================================
   KPI CARDS
   ============================================================ */
.kpi-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.kpi-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 1.1rem 1.25rem;
  transition: border-color 0.15s, background 0.15s;
  position: relative;
  overflow: hidden;
}
.kpi-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--accent), transparent);
  opacity: 0;
  transition: opacity 0.15s;
}
.kpi-card:hover { background: var(--bg-card-hover); border-color: var(--border-light); }
.kpi-card:hover::before { opacity: 1; }

.kpi-label {
  font-size: 0.72rem;
  font-weight: 500;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  display: block;
  margin-bottom: 0.5rem;
}

.kpi-value {
  font-size: 1.9rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.03em;
  line-height: 1;
  display: block;
}

.kpi-sub {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 0.35rem;
  display: flex;
  align-items: center;
  gap: 0.3rem;
}
.kpi-sub.up   { color: var(--success); }
.kpi-sub.down { color: var(--danger); }

/* ============================================================
   CHART CARDS
   ============================================================ */
.charts-grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-bottom: 1rem;
}
.charts-grid-3 {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 1rem;
  margin-bottom: 1rem;
}

.chart-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  box-shadow: var(--shadow-card);
}

.chart-card-wide {
  grid-column: 1 / -1;
}

.chart-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
}

.chart-title {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-primary);
  letter-spacing: -0.01em;
}

.chart-subtitle {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 0.15rem;
}

.chart-container {
  position: relative;
}

.chart-container canvas {
  max-height: 260px;
}

.chart-container.tall canvas {
  max-height: 340px;
}

.chart-container.short canvas {
  max-height: 200px;
}

/* ============================================================
   TABLES
   ============================================================ */
.table-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
  margin-bottom: 1rem;
}

.table-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.25rem 0.75rem;
  border-bottom: 1px solid var(--border);
}

.table-card-header .chart-title { font-size: 0.85rem; }

.table-scroll { overflow-x: auto; }

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.82rem;
}

thead th {
  padding: 0.6rem 1rem;
  text-align: left;
  font-size: 0.72rem;
  font-weight: 500;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border);
  cursor: pointer;
  user-select: none;
  white-space: nowrap;
}
thead th:hover { color: var(--text-secondary); }
thead th.sort-asc::after  { content: ' ↑'; color: var(--accent-light); }
thead th.sort-desc::after { content: ' ↓'; color: var(--accent-light); }

tbody tr {
  border-bottom: 1px solid var(--border);
  transition: background 0.1s;
}
tbody tr:last-child { border-bottom: none; }
tbody tr:hover { background: var(--bg-card-hover); }

tbody td {
  padding: 0.65rem 1rem;
  color: var(--text-primary);
  vertical-align: middle;
}

.td-muted { color: var(--text-secondary); }
.td-number { font-variant-numeric: tabular-nums; font-family: var(--font-mono); font-size: 0.8rem; }

/* ============================================================
   BADGES / STATUS PILLS
   ============================================================ */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.2em 0.6em;
  border-radius: 20px;
  font-size: 0.72rem;
  font-weight: 500;
  white-space: nowrap;
}
.badge-dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  flex-shrink: 0;
}
.badge.ok,      .badge.active   { background: var(--success-dim); color: var(--success); }
.badge.ok .badge-dot            { background: var(--success); }
.badge.warning                  { background: var(--warning-dim); color: var(--warning); }
.badge.warning .badge-dot       { background: var(--warning); }
.badge.error                    { background: var(--danger-dim); color: var(--danger); }
.badge.error .badge-dot         { background: var(--danger); }
.badge.info                     { background: var(--info-dim); color: var(--info); }
.badge.inactive                 { background: rgba(96,96,120,0.15); color: var(--text-muted); }

/* ============================================================
   STAR RATING
   ============================================================ */
.stars { color: var(--warning); letter-spacing: 1px; font-size: 0.78rem; }

/* ============================================================
   SYSTEM INFO PANEL
   ============================================================ */
.sysinfo-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 0.65rem;
  padding: 1.25rem;
}
.sysinfo-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.5rem 0.75rem;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  gap: 0.75rem;
}
.sysinfo-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  white-space: nowrap;
}
.sysinfo-value {
  font-size: 0.8rem;
  color: var(--text-primary);
  font-family: var(--font-mono);
  text-align: right;
}

/* ============================================================
   RANK / LEADERBOARD
   ============================================================ */
.rank-medal { font-size: 1rem; }

/* ============================================================
   PROGRESS BAR
   ============================================================ */
.progress-bar-wrap {
  background: var(--bg-surface);
  border-radius: 99px;
  height: 5px;
  overflow: hidden;
  width: 60px;
  display: inline-block;
  vertical-align: middle;
}
.progress-bar-fill {
  height: 100%;
  border-radius: 99px;
  background: var(--accent);
  transition: width 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}
.progress-bar-fill.green { background: var(--success); }
.progress-bar-fill.amber { background: var(--warning); }
.progress-bar-fill.red   { background: var(--danger); }

/* ============================================================
   LOADING SPINNER
   ============================================================ */
.loading-overlay {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 4rem;
  color: var(--text-muted);
  font-size: 0.85rem;
  gap: 0.5rem;
}
.spinner {
  width: 18px; height: 18px;
  border: 2px solid var(--border-light);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 900px) {
  .charts-grid-2,
  .charts-grid-3 { grid-template-columns: 1fr; }
}

@media (max-width: 700px) {
  .topbar { padding: 0 1rem; gap: 0.5rem; }
  .topbar-brand .brand-name { display: none; }
  .topbar-divider { display: none; }
  .report-date { display: none; }
  .tab-btn { padding: 0.38rem 0.5rem; font-size: 0.75rem; }
  .main-content { padding: 1.25rem 0.75rem; }
  .kpi-grid { grid-template-columns: repeat(2, 1fr); }
  .kpi-value { font-size: 1.5rem; }
}

@media (max-width: 420px) {
  .kpi-grid { grid-template-columns: 1fr 1fr; }
  .tab-btn span { display: none; }
}