/* ================================================================
   Elite Training Center — Main Stylesheet
   Dark hacker aesthetic, terminal/cybersecurity theme
   ================================================================ */

/* --- Variables -------------------------------------------------- */
:root {
  --bg-base:       #0a0a0f;
  --bg-panel:      #0d1117;
  --bg-card:       #111720;
  --bg-hover:      #161d2b;
  --bg-input:      #0d1117;

  --border:        #1e2a3a;
  --border-glow:   #00ff4133;

  --accent-green:  #00ff41;
  --accent-cyan:   #00d4ff;
  --accent-dim:    #1a3a1a;
  --accent-yellow: #ffd700;

  --text:          #c9d1d9;
  --text-dim:      #6e7681;
  --text-muted:    #3d4450;
  --heading:       #ffffff;

  --success:       #00ff41;
  --warning:       #ffd700;
  --error:         #ff4444;
  --pending:       #3d4450;

  --font-mono:     'JetBrains Mono', 'Fira Code', monospace;
  --font-body:     'IBM Plex Sans', 'Segoe UI', sans-serif;
  --font-arabic:   'Noto Kufi Arabic', sans-serif;

  --sidebar-width: 280px;
  --topbar-height: 52px;
  --radius:        6px;
  --radius-sm:     4px;

  --glow-green:    0 0 8px #00ff4166, 0 0 20px #00ff4122;
  --glow-cyan:     0 0 8px #00d4ff66, 0 0 20px #00d4ff22;
  --glow-card:     0 0 0 1px #1e2a3a, 0 4px 24px #00000066;
}

/* --- Reset ----------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html, body { height: 100%; }

body {
  background: var(--bg-base);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.6;
  overflow: hidden;
}

a { color: var(--accent-cyan); text-decoration: none; }
a:hover { text-decoration: underline; }
button { cursor: pointer; font-family: inherit; }
input, textarea, select { font-family: inherit; }

/* --- Utilities ------------------------------------------------- */
.hidden { display: none !important; }
.active { }
.accent { color: var(--accent-green); }
.cursor-blink {
  display: inline-block;
  animation: blink 1s step-end infinite;
  color: var(--accent-green);
}
@keyframes blink { 0%,100% { opacity: 1; } 50% { opacity: 0; } }

/* --- Scrollbar ------------------------------------------------- */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: var(--bg-base); }
::-webkit-scrollbar-thumb { background: #1e2a3a; border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: #2a3a50; }

/* ================================================================
   LOGIN SCREEN
   ================================================================ */
.login-screen {
  position: fixed; inset: 0;
  display: flex; align-items: center; justify-content: center;
  background: var(--bg-base);
  z-index: 100;
}

.scanlines {
  position: fixed; inset: 0; pointer-events: none; z-index: 0;
  background: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 2px,
    rgba(0,255,65,0.015) 2px,
    rgba(0,255,65,0.015) 4px
  );
}

.login-card {
  position: relative; z-index: 1;
  width: 380px;
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 40px 36px;
  box-shadow: var(--glow-card), 0 0 40px rgba(0,255,65,0.05);
}

.login-logo {
  text-align: center;
  font-family: var(--font-mono);
  font-size: 28px;
  font-weight: 700;
  margin-bottom: 12px;
}
.logo-bracket { color: var(--accent-green); }
.logo-text    { color: var(--heading); letter-spacing: 4px; }

.login-title {
  text-align: center;
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 600;
  color: var(--heading);
  letter-spacing: 1px;
  margin-bottom: 4px;
}
.login-subtitle {
  text-align: center;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-dim);
  margin-bottom: 32px;
}

.login-form { display: flex; flex-direction: column; gap: 16px; }

.input-group { display: flex; flex-direction: column; gap: 6px; }
.input-group label {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--accent-green);
  letter-spacing: 0.5px;
}
.input-group input,
.input-group textarea,
.input-group select {
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  padding: 10px 14px;
  font-size: 14px;
  font-family: var(--font-mono);
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
  width: 100%;
}
.input-group input:focus,
.input-group textarea:focus {
  border-color: var(--accent-green);
  box-shadow: 0 0 0 2px var(--border-glow);
}
.input-group input::placeholder { color: var(--text-muted); }
.input-group textarea { resize: vertical; min-height: 80px; }

.login-error {
  margin-top: 8px;
  padding: 10px 14px;
  background: rgba(255,68,68,0.1);
  border: 1px solid rgba(255,68,68,0.3);
  border-radius: var(--radius-sm);
  color: var(--error);
  font-family: var(--font-mono);
  font-size: 12px;
}

.login-status {
  display: flex; align-items: center; gap: 8px;
  margin-top: 20px;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-dim);
}

/* Status dot */
.status-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--text-muted);
  flex-shrink: 0;
  transition: background 0.3s, box-shadow 0.3s;
}
.status-dot.connected  { background: var(--accent-green); box-shadow: var(--glow-green); }
.status-dot.connecting { background: var(--accent-yellow); animation: pulse 1.2s ease-in-out infinite; }
.status-dot.reconnecting { background: var(--accent-yellow); animation: pulse 0.6s ease-in-out infinite; }
.status-dot.disconnected { background: var(--error); }

@keyframes pulse {
  0%,100% { opacity: 1; }
  50%      { opacity: 0.4; }
}

/* ================================================================
   BUTTONS
   ================================================================ */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 10px 20px;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 1px;
  cursor: pointer;
  transition: all 0.2s;
  text-decoration: none;
  white-space: nowrap;
}
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

.btn-primary {
  background: var(--accent-green);
  color: #000;
  border-color: var(--accent-green);
}
.btn-primary:hover:not(:disabled) {
  background: #33ff66;
  box-shadow: var(--glow-green);
}

.btn-outline {
  background: transparent;
  color: var(--text-dim);
  border-color: var(--border);
}
.btn-outline:hover:not(:disabled) {
  border-color: var(--accent-green);
  color: var(--accent-green);
}

.btn-success {
  background: transparent;
  color: var(--accent-green);
  border-color: var(--accent-green);
}
.btn-success:hover:not(:disabled) {
  background: rgba(0,255,65,0.1);
}

.btn-danger {
  background: transparent;
  color: var(--error);
  border-color: var(--error);
}
.btn-danger:hover:not(:disabled) { background: rgba(255,68,68,0.1); }

.btn-sm { padding: 6px 14px; font-size: 11px; }
.btn-block { width: 100%; }

/* Spinner */
.spinner {
  width: 14px; height: 14px;
  border: 2px solid rgba(0,0,0,0.3);
  border-top-color: #000;
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ================================================================
   TOP BAR
   ================================================================ */
.topbar {
  height: var(--topbar-height);
  background: var(--bg-panel);
  border-bottom: 1px solid var(--border);
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 16px;
  flex-shrink: 0;
  z-index: 10;
  position: relative;
}

.topbar-left, .topbar-right {
  display: flex; align-items: center; gap: 12px;
}

.logo {
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
}

.topbar-sep {
  color: var(--border);
  font-family: var(--font-mono);
}

.topbar-title {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--text-dim);
}

.icon-btn {
  background: none; border: none;
  color: var(--text-dim);
  font-size: 18px; padding: 4px 8px;
  border-radius: var(--radius-sm);
  transition: color 0.2s, background 0.2s;
}
.icon-btn:hover { color: var(--accent-green); background: var(--bg-hover); }

.lang-toggle {
  display: flex; align-items: center; gap: 4px;
  background: var(--bg-base);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 2px 4px;
}
.lang-btn {
  background: none; border: none;
  color: var(--text-dim);
  font-family: var(--font-mono);
  font-size: 11px; font-weight: 600;
  padding: 3px 8px;
  border-radius: 3px;
  transition: all 0.2s;
}
.lang-btn.active {
  background: var(--accent-green);
  color: #000;
}
.lang-btn:not(.active):hover { color: var(--accent-green); }
.lang-sep { color: var(--border); font-size: 11px; }

.user-info { display: flex; align-items: center; gap: 8px; }
.user-name {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text);
}

/* Badges */
.badge {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.5px;
  padding: 2px 8px;
  border-radius: 20px;
  border: 1px solid;
  text-transform: uppercase;
}
.badge-student  { color: var(--accent-cyan);   border-color: var(--accent-cyan);   background: rgba(0,212,255,0.1); }
.badge-teacher  { color: var(--accent-yellow);  border-color: var(--accent-yellow); background: rgba(255,215,0,0.1); }
.badge-admin    { color: var(--error);          border-color: var(--error);         background: rgba(255,68,68,0.1); }

/* ================================================================
   APP LAYOUT
   ================================================================ */
.app {
  display: flex; flex-direction: column;
  height: 100vh;
}

.app-body {
  display: flex;
  flex: 1;
  overflow: hidden;
}

/* ================================================================
   SIDEBAR
   ================================================================ */
.sidebar {
  width: var(--sidebar-width);
  flex-shrink: 0;
  background: var(--bg-panel);
  border-right: 1px solid var(--border);
  display: flex; flex-direction: column;
  overflow: hidden;
  transition: width 0.25s ease, opacity 0.25s ease;
}

.sidebar.collapsed {
  width: 0;
  opacity: 0;
  overflow: hidden;
}

.sidebar-top-nav {
  padding: 8px 0;
  flex-shrink: 0;
}

.sidebar-nav-item {
  display: flex; align-items: center; gap: 10px;
  padding: 10px 16px;
  color: var(--text-dim);
  font-family: var(--font-mono);
  font-size: 12px;
  cursor: pointer;
  transition: all 0.15s;
  border-left: 2px solid transparent;
  text-decoration: none;
}
.sidebar-nav-item:hover {
  color: var(--text);
  background: var(--bg-hover);
  text-decoration: none;
}
.sidebar-nav-item.active {
  color: var(--accent-green);
  border-left-color: var(--accent-green);
  background: var(--accent-dim);
}

.nav-icon { font-size: 14px; opacity: 0.7; }
.nav-label { flex: 1; }

.sidebar-divider {
  height: 1px;
  background: var(--border);
  margin: 4px 0;
}

.sidebar-course-label {
  padding: 10px 16px 4px;
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--text-muted);
  letter-spacing: 1px;
}

.course-tree {
  flex: 1;
  overflow-y: auto;
  padding-bottom: 16px;
}

.tree-loading, .tree-empty {
  padding: 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-dim);
}

/* Tree nodes */
.tree-module { border-bottom: 1px solid var(--border); }

.tree-module-header {
  display: flex; align-items: center; gap: 8px;
  padding: 10px 16px;
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  color: var(--text);
  transition: background 0.15s;
}
.tree-module-header:hover { background: var(--bg-hover); }

.tree-arrow {
  font-size: 9px;
  color: var(--text-muted);
  flex-shrink: 0;
  width: 10px;
  transition: transform 0.2s;
}
.tree-arrow.open { color: var(--accent-green); }

.tree-module-name { flex: 1; }

.tree-module-badge {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--text-muted);
  background: var(--bg-base);
  padding: 1px 6px;
  border-radius: 10px;
  border: 1px solid var(--border);
}
.tree-module-badge.complete {
  color: var(--accent-green);
  border-color: var(--accent-green);
  background: var(--accent-dim);
}

.tree-classes.hidden { display: none; }

.tree-class { padding-left: 0; }

.tree-class-header {
  display: flex; align-items: center; gap: 8px;
  padding: 7px 16px 7px 28px;
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-dim);
  transition: background 0.15s;
}
.tree-class-header:hover { background: var(--bg-hover); color: var(--text); }

.tree-class-name { flex: 1; }
.tree-lectures.hidden { display: none; }

.tree-lecture {
  display: flex; align-items: center; gap: 8px;
  padding: 6px 16px 6px 44px;
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-dim);
  border-left: 2px solid transparent;
  transition: all 0.15s;
}
.tree-lecture:hover { background: var(--bg-hover); color: var(--text); }
.tree-lecture.active {
  color: var(--accent-green);
  background: var(--accent-dim);
  border-left-color: var(--accent-green);
}
.tree-lecture.complete { color: var(--text); }

.tree-lecture-dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--pending);
  flex-shrink: 0;
  transition: all 0.3s;
}
.tree-lecture-dot.complete {
  background: var(--accent-green);
  box-shadow: 0 0 4px var(--accent-green);
}

.tree-lecture-name { flex: 1; }

/* ================================================================
   MAIN CONTENT
   ================================================================ */
.main-content {
  flex: 1;
  overflow-y: auto;
  display: flex; flex-direction: column;
}

.view {
  flex: 1;
  display: none;
  flex-direction: column;
}
.view.active { display: flex; }
.view.hidden  { display: none; }

.view-inner {
  padding: 32px;
  max-width: 1100px;
}

/* ================================================================
   LECTURE VIEW
   ================================================================ */
.lecture-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 16px 32px;
  border-bottom: 1px solid var(--border);
  background: var(--bg-panel);
  flex-shrink: 0;
}

.lecture-breadcrumb {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-dim);
  display: flex; align-items: center; gap: 6px;
}
.bc-sep { color: var(--text-muted); }
.bc-current { color: var(--text); }

.lecture-actions { display: flex; align-items: center; gap: 10px; }

.lecture-body {
  flex: 1;
  padding: 32px;
  overflow-y: auto;
}

.status-badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: 20px;
  border: 1px solid;
}
.status-badge.complete {
  color: var(--accent-green);
  border-color: var(--accent-green);
  background: rgba(0,255,65,0.08);
}
.status-badge.pending {
  color: var(--text-muted);
  border-color: var(--border);
  background: transparent;
}

.md-loading {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--text-dim);
  padding: 24px 0;
}
.md-error {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--error);
  padding: 24px;
  background: rgba(255,68,68,0.08);
  border: 1px solid rgba(255,68,68,0.2);
  border-radius: var(--radius);
}

/* ================================================================
   DASHBOARD
   ================================================================ */
.dashboard-header {
  margin-bottom: 28px;
}
.dashboard-greeting {
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 700;
  color: var(--heading);
  margin-bottom: 4px;
}
.dashboard-subtitle {
  font-size: 13px;
  color: var(--text-dim);
  font-family: var(--font-mono);
}

/* Progress cards grid */
.progress-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 16px;
  margin-bottom: 32px;
}

.progress-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  transition: border-color 0.2s, box-shadow 0.2s;
}
.progress-card:hover {
  border-color: rgba(0,255,65,0.3);
  box-shadow: 0 0 0 1px rgba(0,255,65,0.1);
}

.progress-card-header {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 12px;
}
.progress-card-title {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  color: var(--text);
}
.progress-card-pct {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--text-muted);
}
.progress-card-pct.complete { color: var(--accent-green); text-shadow: var(--glow-green); }

.progress-bar-wrap {
  height: 4px;
  background: var(--bg-base);
  border-radius: 2px;
  overflow: hidden;
  margin-bottom: 14px;
}
.progress-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent-green), var(--accent-cyan));
  border-radius: 2px;
  transition: width 0.6s ease;
}
.progress-bar-fill.complete {
  box-shadow: var(--glow-green);
}

/* Lecture dots grid */
.lecture-dots {
  display: flex; flex-wrap: wrap; gap: 5px;
}
.lecture-dot {
  width: 10px; height: 10px;
  border-radius: 2px;
  background: var(--pending);
  cursor: pointer;
  transition: all 0.2s;
  flex-shrink: 0;
}
.lecture-dot.complete {
  background: var(--accent-green);
  box-shadow: 0 0 4px var(--accent-green);
}
.lecture-dot.pending { background: #1a2535; }
.lecture-dot:hover { transform: scale(1.3); }

/* ================================================================
   ANALYTICS (ADMIN)
   ================================================================ */
.analytics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 14px;
  margin-bottom: 28px;
}

.analytics-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  text-align: center;
}
.analytics-card-title {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-dim);
  margin-bottom: 10px;
  word-break: break-word;
}
.analytics-pct {
  font-family: var(--font-mono);
  font-size: 32px;
  font-weight: 700;
  color: var(--text-muted);
  margin-bottom: 6px;
}
.analytics-pct.complete { color: var(--accent-green); text-shadow: var(--glow-green); }
.analytics-sub { font-size: 11px; color: var(--text-muted); font-family: var(--font-mono); }

/* Student table */
.student-table-wrap {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: auto;
}

.section-title {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  color: var(--text);
  padding: 16px 20px 12px;
  border-bottom: 1px solid var(--border);
}
.section-hint {
  font-size: 12px;
  color: var(--text-dim);
  padding: 12px 20px;
}

.student-table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--font-mono);
  font-size: 12px;
}
.student-table th {
  text-align: left;
  padding: 10px 16px;
  background: var(--bg-panel);
  color: var(--text-dim);
  border-bottom: 1px solid var(--border);
  font-weight: 600;
  white-space: nowrap;
}
.student-table td {
  padding: 10px 16px;
  border-bottom: 1px solid var(--border);
  color: var(--text);
}
.student-table tr:last-child td { border-bottom: none; }
.student-table tr:hover td { background: var(--bg-hover); }

.cell-pct {
  font-weight: 600;
  color: var(--text-muted);
}
.cell-pct.complete { color: var(--accent-green); }

/* ================================================================
   ANNOUNCEMENTS
   ================================================================ */
.view-header {
  padding: 24px 32px 16px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}
.view-header h2 {
  font-family: var(--font-mono);
  font-size: 18px;
  font-weight: 700;
  color: var(--heading);
}

.announcement-composer {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  margin-bottom: 24px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.announcement-composer h3 {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 4px;
}

.announcement-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 20px;
  margin-bottom: 12px;
  transition: border-color 0.2s;
}
.announcement-card:hover { border-color: rgba(0,212,255,0.3); }

.announcement-header {
  display: flex; align-items: baseline; justify-content: space-between;
  gap: 12px;
  margin-bottom: 8px;
}
.announcement-title {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  color: var(--heading);
}
.announcement-meta {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--text-dim);
  white-space: nowrap;
}
.announcement-body {
  font-size: 13px;
  color: var(--text);
  line-height: 1.6;
}

.empty-state {
  padding: 32px;
  text-align: center;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--text-muted);
}

.teacher-section {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}

/* ================================================================
   TOAST NOTIFICATIONS
   ================================================================ */
.toast-container {
  position: fixed;
  bottom: 24px; right: 24px;
  display: flex; flex-direction: column; gap: 8px;
  z-index: 200;
}

.toast {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 12px 18px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text);
  min-width: 220px;
  transform: translateX(110%);
  transition: transform 0.3s ease;
  box-shadow: var(--glow-card);
}
.toast.show { transform: translateX(0); }
.toast-success { border-color: var(--accent-green); color: var(--accent-green); }
.toast-error   { border-color: var(--error); color: var(--error); }
.toast-info    { border-color: var(--accent-cyan); color: var(--accent-cyan); }

/* ================================================================
   RESPONSIVE
   ================================================================ */
@media (max-width: 768px) {
  .sidebar {
    position: absolute;
    top: var(--topbar-height); left: 0; bottom: 0;
    z-index: 20;
    box-shadow: 4px 0 20px rgba(0,0,0,0.5);
  }
  .sidebar.collapsed { width: 0; }
  .view-inner { padding: 20px; }
  .lecture-body { padding: 20px; }
  .progress-grid { grid-template-columns: 1fr; }
  .analytics-grid { grid-template-columns: repeat(2, 1fr); }
  .topbar-right .user-info { display: none; }
  .lecture-header { flex-direction: column; align-items: flex-start; gap: 10px; }
}