:root {
    --bg: #23133a;
    --surface: #23133a;
    --surface2: #1f1232;
    --surface3: #2b1f3d;
    --border: #3a1c63;
    --border2: #5e309d;
    --accent: #883CF0;
    --accent2: #883CF0;
    --danger: #ff3b5c;
    --danger2: #cc1f3f;
    --warn: #ffaa00;
    --success: #00e676;
    --success2: #00b85a;
    --muted: #d6d6d6;
    --text: #e9f0f7;
    --text2: #e9f0f7;
    --text3: #e9f0f7;
    --glow: 0 0 20px #3a1c63;
    --glow-danger: 0 0 20px rgba(255,59,92,0.2);
    --glow-success: 0 0 20px rgba(0,230,118,0.15);
  }

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

  .credential-rotation-training {
    color: var(--text);
    font-size: 15px;
    line-height: 1.6;
    height: 100vh;
    overflow-x: hidden;
    overflow-y: auto;
  }

  /* ── Scanline overlay ── */
  .credential-rotation-training::before {
    content: '';
    position: absolute; inset: 0;
    background: repeating-linear-gradient(0deg, transparent, transparent 2px, rgba(0,0,0,0.03) 2px, rgba(0,0,0,0.03) 4px);
    pointer-events: none;
    z-index: 1;
  }

    ::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: #873cf015; }
::-webkit-scrollbar-thumb { background: #873cf015; border-radius: 3px; }

  /* ── Header ── */
  .credential-rotation-training .site-header {
    background: linear-gradient(135deg, #180f26 0%, #180f26 50%, #180f26 100%);
    border-bottom: 1px solid var(--border);
    padding: 0 40px;
    position: sticky; top: 0; z-index: 1;
    display: flex; align-items: center; justify-content: space-between;
    height: 60px;
  }
  .site-header::after {
    content: '';
    position: absolute; bottom: 0; left: 0; right: 0; height: 1px;
    background: linear-gradient(90deg, transparent, var(--accent), transparent);
    opacity: 0.4;
  }
  .logo { display: flex; align-items: center; gap: 12px; }
  .logo-icon {
    width: 32px; height: 32px;
    background: linear-gradient(135deg, var(--accent), #0066aa);
    border-radius: 6px;
    display: flex; align-items: center; justify-content: center;
    font-size: 16px;
  }
  .logo-text {  font-size: 18px; font-weight: 700;  color: var(--text); }
  .logo-sub {  font-size: 10px; color: var(--accent);  }
  .header-badge {
     font-size: 10px; color: var(--accent2);
    border: 1px solid var(--accent2); padding: 3px 10px; border-radius: 2px;
    
  }

  /* ── Hero ── */
  .hero {
    background: linear-gradient(180deg, #191127 0%, #23133a 100%);
    padding: 60px 40px 48px;
    position: relative; 
    overflow: hidden;
  }
  .hero-grid {
    position: absolute; inset: 0;
    background-image:
      linear-gradient(#1f1232 1px, transparent 1px),
      linear-gradient(90deg, #1f1232 1px, transparent 1px);
    background-size: 40px 40px;
    mask-image: radial-gradient(ellipse 80% 80% at 50% 0%, black, transparent);
  }
  .hero-content { position: relative; max-width: 900px; margin: 0 auto; }
  .course-tag {
    display: inline-flex; align-items: center; gap: 8px;
     font-size: 10px; 
    color: var(--accent); text-transform: uppercase;
    border: 1px solid #3a1c63; padding: 4px 12px;
    border-radius: 2px; margin-bottom: 20px;
    background: #291a3e;
  }
  .course-tag::before { content: '//'; opacity: 0.6; }
  .hero h1 {
     font-size: 52px; font-weight: 800;
    line-height: 1;
    color: #fff; margin-bottom: 8px;
  }
  .hero h1 span { color: var(--accent); }
  .hero-sub {
     font-size: 22px; font-weight: 300;
    color: var(--text2); margin-bottom: 24px;
  }
  .hero-desc { font-size: 15px; color: var(--text2); max-width: 600px; line-height: 1.7; margin-bottom: 36px; }
  .hero-meta {
    display: flex; gap: 32px; flex-wrap: wrap;
  }
  .meta-item { display: flex; flex-direction: column; gap: 2px; }
  .meta-label {  font-size: 9px;  color: var(--muted); text-transform: uppercase; }
  .meta-value {  font-size: 16px; font-weight: 600; color: var(--text); }

  /* ── Progress Bar ── */
  .progress-bar-wrap {
    background: var(--surface); border: 1px solid var(--border);
    padding: 16px 40px; display: flex; align-items: center; gap: 20px;
  }
  .progress-label {  font-size: 11px; color: var(--muted);  white-space: nowrap; }
  .progress-track { flex: 1; height: 4px; background: #443a52; border-radius: 2px; overflow: hidden; }
  .progress-fill { height: 100%; background: linear-gradient(90deg, #3a1c63, #684895); border-radius: 2px; transition: width 0.5s ease; width: 0%; }
  .progress-pct {  font-size: 12px; color: var(--accent); min-width: 36px; text-align: right; }

  /* ── Nav Tabs ── */
  .nav-tabs {
    display: flex; overflow-x: auto; gap: 0;
    background: var(--surface); border-bottom: 1px solid var(--border);
    padding: 0; scrollbar-width: none;
  }
  .nav-tabs::-webkit-scrollbar { display: none; }
  .tab-btn {
    flex-shrink: 0; padding: 0 24px; height: 52px;
     font-size: 13px; font-weight: 600;
    text-transform: uppercase;
    color: var(--muted); background: none; border: none; cursor: pointer;
    border-bottom: 2px solid transparent; transition: all 0.2s;
    display: flex; align-items: center; gap: 8px;
    white-space: nowrap;
  }
  .tab-btn:hover { color:#883cf0e0; }
  .tab-btn.active { color: var(--accent); border-bottom-color: var(--accent); }
  .tab-num {
     font-size: 10px;
    color: var(--text3);
    background: var(--surface2); padding: 2px 5px; border-radius: 2px;
  }
  .tab-btn.active .tab-num { background: #3a1c63; color: var(--accent); }

  /* ── Panels ── */
  .panels { max-width: 1100px; margin: 0 auto; padding: 40px; }
  .panel { display: none; }
  .panel.active { display: block; animation: fadeIn 0.3s ease; }
  @keyframes fadeIn { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: translateY(0); } }

  /* ── Section Heading ── */
  .section-title {
     font-size: 32px; font-weight: 700;
    color: #fff; margin-bottom: 6px;
  }
  .section-title span { color: var(--accent); }
  .section-sub { color: var(--text2); font-size: 14px; margin-bottom: 32px; max-width: 660px; line-height: 1.7; }

  /* ── Risk Cards ── */
  .risk-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 16px; margin-bottom: 36px; }
  .risk-card {
    background: var(--surface2); border: 1px solid var(--border2);
    border-top: 3px solid var(--danger);
    padding: 20px; border-radius: 2px;
    position: relative; overflow: hidden;
    cursor: pointer; transition: all 0.2s;
  }
  .risk-card:hover { border-color: var(--danger); transform: translateY(-2px); box-shadow: var(--glow-danger); }
  .risk-card::before { content: ''; position: absolute; top: 0; right: 0; width: 60px; height: 60px; background: radial-gradient(circle at top right, rgba(255,59,92,0.08), transparent); }
  .risk-icon { font-size: 24px; margin-bottom: 12px; }
  .risk-label {  font-size: 14px; font-weight: 700; color: var(--danger); text-transform: uppercase; margin-bottom: 8px; }
  .risk-desc { font-size: 13px; color: var(--text2); line-height: 1.6; }
  .risk-severity {
    margin-top: 14px; display: flex; align-items: center; gap: 6px;
     font-size: 10px; color: var(--danger);
  }
  .risk-dots { display: flex; gap: 3px; }
  .risk-dot { width: 6px; height: 6px; border-radius: 50%; background: var(--danger); }
  .risk-dot.empty { background: var(--border2); }

  /* ── Comparison Table ── */
  .compare-wrap { background: var(--surface2); border: 1px solid var(--border); border-radius: 2px; overflow: hidden; margin-bottom: 36px; }
  .compare-head {
    display: grid; grid-template-columns: 1fr 1fr 1fr;
    background: var(--surface3);
  }
  .compare-head-cell {
    padding: 14px 20px;  font-size: 12px; font-weight: 700;  text-transform: uppercase;
  }
  .compare-head-cell:nth-child(2) { color: var(--danger); border-left: 1px solid var(--border); }
  .compare-head-cell:nth-child(3) { color: var(--success); border-left: 1px solid var(--border); }
  .compare-head-cell:first-child { color: var(--text3); }
  .compare-row { display: grid; grid-template-columns: 1fr 1fr 1fr; border-top: 1px solid var(--border); }
  .compare-row:hover { background: rgba(255,255,255,0.02); }
  .compare-cell { padding: 12px 20px; font-size: 13px; }
  .compare-cell:nth-child(2) { color: var(--danger); border-left: 1px solid var(--border); background: rgba(255,59,92,0.03); }
  .compare-cell:nth-child(3) { color: var(--success); border-left: 1px solid var(--border); background: rgba(0,230,118,0.03); }
  .compare-cell:first-child { color: var(--text2); font-weight: 500; }

  /* ── Terminal ── */
  .terminal {
    background: #050810;
    border: 1px solid var(--border2);
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: 24px;
    
  }
  .terminal-bar {
    background: var(--surface3); padding: 10px 16px;
    display: flex; align-items: center; gap: 10px;
    border-bottom: 1px solid var(--border);
  }
  .t-dot { width: 10px; height: 10px; border-radius: 50%; }
  .t-red { background: #ff5f57; }
  .t-yellow { background: #febc2e; }
  .t-green { background: #28c840; }
  .terminal-title { font-size: 11px; color: var(--muted); flex: 1; text-align: center; }
  .terminal-body { padding: 20px; min-height: 120px; font-size: 12px; line-height: 1.8; }
  .t-prompt { color: var(--accent); }
  .t-cmd { color: var(--text); }
  .t-out { color: var(--text2); }
  .t-ok { color: var(--success); }
  .t-err { color: var(--danger); }
  .t-warn { color: var(--warn); }
  .t-comment { color: var(--text3); }
  .t-line { display: block; }
  .cursor { display: inline-block; width: 7px; height: 13px; background: var(--accent); animation: blink 1s step-end infinite; vertical-align: text-bottom; }
  @keyframes blink { 0%,100%{opacity:1} 50%{opacity:0} }

  /* ── Steps ── */
  .step-list { display: flex; flex-direction: column; gap: 0; margin-bottom: 32px; }
  .step-item {
    display: flex; gap: 0; position: relative;
  }
  .step-item:not(:last-child) .step-line { flex: 1; background: var(--border2); }
  .step-left { display: flex; flex-direction: column; align-items: center; margin-right: 20px; width: 32px; flex-shrink: 0; }
  .step-num {
    width: 32px; height: 32px; border-radius: 50%;
    border: 2px solid var(--accent); color: var(--accent);
    display: flex; align-items: center; justify-content: center;
     font-size: 12px; font-weight: bold; flex-shrink: 0;
    background: var(--surface); z-index: 1; position: relative;
    transition: all 0.3s;
  }
  .step-num.done { background: var(--success); border-color: var(--success); color: var(--bg); }
  .step-num.active { background: var(--accent); color: var(--bg); box-shadow: 0 0 12px rgba(0,212,255,0.5); }
  .step-line { width: 2px; background: var(--border2); flex: 1; min-height: 24px; margin-top: 2px; }
  .step-content { padding: 4px 0 28px; flex: 1; }
  .step-title {  font-size: 16px; font-weight: 700; color: var(--text); margin-bottom: 6px; }
  .step-body { font-size: 13px; color: var(--text2); line-height: 1.65; }

  /* ── Lab Box ── */
  .lab-box {
    background: var(--surface2); border: 1px solid var(--border2);
    border-left: 3px solid var(--accent); padding: 24px; margin-bottom: 24px; border-radius: 0 4px 4px 0;
  }
  .lab-title {  font-size: 13px; font-weight: 700;  text-transform: uppercase; color: var(--accent); margin-bottom: 16px; display: flex; align-items: center; gap: 8px; }
  .lab-title::before { content: '⚡'; }

  /* ── Buttons ── */
  .btn {
     font-size: 13px; font-weight: 700; 
    text-transform: uppercase; padding: 10px 24px; border-radius: 2px; border: none; cursor: pointer;
    transition: all 0.2s; display: inline-flex; align-items: center; gap: 8px;
  }
  .btn-primary {
    background: linear-gradient(135deg, var(--accent2), var(--accent));
    color: var(--bg);
  }
  .btn-primary:hover { transform: translateY(-1px); box-shadow: var(--glow); }
  .btn-secondary {
    background: none; border: 1px solid var(--accent2);
    color: var(--accent);
  }
  .btn-secondary:hover { background: #1f1232; }
  .btn-danger { background: linear-gradient(135deg, var(--danger2), var(--danger)); color: #fff; }
  .btn-danger:hover { box-shadow: var(--glow-danger); }
  .btn-sm { padding: 6px 16px; font-size: 11px; }
  .btn:disabled { opacity: 0.4; cursor: not-allowed; transform: none !important; box-shadow: none !important; }

  /* ── Status Badge ── */
  .badge { display: inline-flex; align-items: center; gap: 5px; padding: 3px 10px; border-radius: 2px;  font-size: 10px;  }
  .badge-ok { background: rgba(0,230,118,0.12); color: var(--success); border: 1px solid rgba(0,230,118,0.3); }
  .badge-err { background: rgba(255,59,92,0.12); color: var(--danger); border: 1px solid rgba(255,59,92,0.3); }
  .badge-warn { background: rgba(255,170,0,0.12); color: var(--warn); border: 1px solid rgba(255,170,0,0.3); }
  .badge-info { background: #23133a; color: var(--accent); border: 1px solid #3a1c63; }
  .badge::before { content: '●'; font-size: 8px; }

  /* ── Alert / Log ── */
  .alert-log { background: #050810; border: 1px solid var(--border2); padding: 16px 20px; border-radius: 4px;  font-size: 11px; max-height: 220px; overflow-y: auto; margin-bottom: 16px; }
  .alert-log::-webkit-scrollbar { width: 4px; }
  .alert-log::-webkit-scrollbar-track { background: var(--surface); }
  .alert-log::-webkit-scrollbar-thumb { background: var(--border2); }
  .log-line { display: flex; gap: 12px; padding: 3px 0; border-bottom: 1px solid rgba(255,255,255,0.03); }
  .log-ts { color: var(--text3); min-width: 80px; }
  .log-lvl { min-width: 50px; }
  .log-msg { color: var(--text2); }
  .log-ok .log-lvl { color: var(--success); }
  .log-err .log-lvl { color: var(--danger); }
  .log-warn .log-lvl { color: var(--warn); }
  .log-info .log-lvl { color: var(--accent); }

  /* ── Flow Diagram ── */
  .flow-wrap {
    background: var(--surface2); border: 1px solid var(--border);
    padding: 28px 20px; border-radius: 4px; margin-bottom: 28px;
    overflow-x: auto;
  }
  .flow { display: flex; align-items: center; gap: 0; flex-wrap: nowrap; min-width: 600px; justify-content: center; }
  .flow-node {
    flex-shrink: 0; background: var(--surface3); border: 1px solid var(--border2);
    padding: 12px 16px; border-radius: 4px; text-align: center;
    min-width: 110px; position: relative; transition: all 0.3s;
  }
  .flow-node.active { border-color: var(--accent); box-shadow: var(--glow); }
  .flow-node.done { border-color: var(--success); }
  .flow-node.error { border-color: var(--danger); }
  .flow-node-icon { font-size: 20px; margin-bottom: 6px; }
  .flow-node-label {  font-size: 10px; color: var(--text2); }
  .flow-node-status {  font-size: 9px; margin-top: 4px; }
  .flow-arrow {
    flex-shrink: 0; width: 36px; height: 2px;
    background: var(--border2); position: relative;
    transition: all 0.3s;
  }
  .flow-arrow::after {
    content: ''; position: absolute; right: -6px; top: -4px;
    border: 5px solid transparent; border-left-color: var(--border2);
    transition: all 0.3s;
  }
  .flow-arrow.active { background: var(--accent); }
  .flow-arrow.active::after { border-left-color: var(--accent); }
  .flow-arrow.done { background: var(--success); }
  .flow-arrow.done::after { border-left-color: var(--success); }

  /* ── Device Grid ── */
  .device-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: 16px; margin-bottom: 28px; }
  .device-card {
    background: var(--surface2); border: 1px solid var(--border2);
    padding: 20px; border-radius: 4px; cursor: pointer; transition: all 0.2s;
    position: relative; overflow: hidden;
  }
  .device-card:hover { border-color: var(--accent2); transform: translateY(-2px); }
  .device-card.selected { border-color: var(--accent); box-shadow: var(--glow); }
  .device-card::before { content: ''; position: absolute; top: 0; left: 0; right: 0; height: 2px; background: var(--border2); transition: background 0.2s; }
  .device-card.selected::before { background: linear-gradient(90deg, var(--accent2), var(--accent)); }
  .device-icon { font-size: 28px; margin-bottom: 12px; }
  .device-name {  font-size: 15px; font-weight: 700; color: var(--text); margin-bottom: 4px; }
  .device-type {  font-size: 10px; color: var(--accent2); margin-bottom: 10px; }
  .device-info { font-size: 12px; color: var(--text2); line-height: 1.5; }
  .device-status { margin-top: 12px; }

  /* ── Retry Diagram ── */
  .retry-flow { display: flex; flex-direction: column; gap: 0; }
  .retry-node {
    display: flex; align-items: flex-start; gap: 16px; padding: 16px 20px;
    background: var(--surface2); border: 1px solid var(--border2); margin-bottom: -1px;
    transition: all 0.3s;
  }
  .retry-node:first-child { border-radius: 4px 4px 0 0; }
  .retry-node:last-child { border-radius: 0 0 4px 4px; }
  .retry-node.active { background: rgba(0,212,255,0.05); border-color: var(--accent); z-index: 1; }
  .retry-node.error { background: rgba(255,59,92,0.05); border-color: var(--danger); z-index: 1; }
  .retry-node.warn { background: rgba(255,170,0,0.05); border-color: var(--warn); z-index: 1; }
  .retry-node.success { background: rgba(0,230,118,0.05); border-color: var(--success); z-index: 1; }
  .retry-icon { font-size: 18px; margin-top: 2px; flex-shrink: 0; }
  .retry-title {  font-size: 14px; font-weight: 700; color: var(--text); margin-bottom: 4px; }
  .retry-desc { font-size: 12px; color: var(--text2); line-height: 1.5; }

  /* ── Audit Timeline ── */
  .audit-table { width: 100%; border-collapse: collapse; font-size: 12px;  }
  .audit-table th { background: var(--surface3); padding: 10px 14px; text-align: left; font-size: 10px;  color: var(--muted); font-weight: normal; border-bottom: 1px solid var(--border); }
  .audit-table td { padding: 10px 14px; border-bottom: 1px solid rgba(255,255,255,0.04); color: var(--text2); vertical-align: top; }
  .audit-table tr:hover td { background: rgba(255,255,255,0.02); }
  .audit-wrap { background: var(--surface2); border: 1px solid var(--border); border-radius: 4px; overflow: hidden; margin-bottom: 28px; }

  /* ── Quiz ── */
  .quiz-card { background: var(--surface2); border: 1px solid var(--border2); padding: 28px; border-radius: 4px; margin-bottom: 20px; }
  .quiz-q {  font-size: 17px; font-weight: 600; color: var(--text); margin-bottom: 20px; }
  .quiz-opts { display: flex; flex-direction: column; gap: 10px; }
  .quiz-opt {
    display: flex; align-items: flex-start; gap: 12px; padding: 12px 16px;
    background: #883cf050; border: 1px solid var(--border2); border-radius: 4px;
    cursor: pointer; transition: all 0.15s; font-size: 13px; color: var(--text2);
  }
  .quiz-opt:hover { border-color: var(--accent2); color: var(--text); }
  .quiz-opt.correct { border-color: #77b255; background: #77b25520; color: #60c090; }
  .quiz-opt.wrong { border-color: #dc143c; background: #dc143c2b; color: #ff7a90; }
  .quiz-opt-letter {
    width: 22px; height: 22px; border-radius: 50%; border: 1px solid var(--border2);
    display: flex; align-items: center; justify-content: center;
     font-size: 10px; flex-shrink: 0; font-weight: bold;
    background: var(--surface);
  }
  .quiz-feedback { margin-top: 14px; padding: 12px 16px; border-radius: 4px; font-size: 13px; display: none; }
  .quiz-feedback.show { display: block; }
  .quiz-feedback.ok { background: #77b25520; border: 1px solid #77b255; color: #60c090; }
  .quiz-feedback.no { background: #dc143c2b; border: 1px solid #dc143c; color: #ff7a90; }

  /* ── Nav Footer ── */
  .nav-footer { display: flex; justify-content: space-between; align-items: center; margin-top: 48px; padding-top: 24px; border-top: 1px solid var(--border); }
  .nav-footer .btn { min-width: 140px; justify-content: center; }

  /* ── Divider ── */
  .divider { height: 1px; background: var(--border); margin: 32px 0; }

  /* ── Info callout ── */
  .callout { display: flex; gap: 14px; padding: 16px 20px; border-radius: 4px; margin-bottom: 24px; }
  .callout-info { background: #23133a; border: 1px solid #3a1c63; }
  .callout-warn { background: rgba(255,170,0,0.05); border: 1px solid rgba(255,170,0,0.25); }
  .callout-danger { background: rgba(255,59,92,0.05); border: 1px solid rgba(255,59,92,0.25); }
  .callout-icon { font-size: 18px; flex-shrink: 0; margin-top: 1px; }
  .callout-text { font-size: 13px; color: var(--text2); line-height: 1.65; }
  .callout-text strong { color: var(--text); }

  /* ── Spinner ── */
  .spinner { display: inline-block; width: 14px; height: 14px; border: 2px solid var(--border2); border-top-color: var(--accent); border-radius: 50%; animation: spin 0.7s linear infinite; }
  @keyframes spin { to { transform: rotate(360deg); } }

  /* ── Simulation Controls ── */
  .sim-controls { display: flex; gap: 12px; align-items: center; flex-wrap: wrap; margin-bottom: 20px; }
  .sim-status {  font-size: 11px; color: var(--text2); display: flex; align-items: center; gap: 8px; }

  /* ── Responsive ── */
  @media (max-width: 700px) {
    .credential-rotation-training .site-header{
      flex-direction: column;
      height: auto;
      gap: 10px;
    }
    .hero { padding: 32px 20px 28px; }
    .hero h1 { font-size: 32px; }
    .panels { padding: 24px 20px; }
    .nav-tabs { padding: 0 12px; }
    .compare-head, .compare-row { grid-template-columns: 1.2fr 1fr 1fr; }
    .flow { min-width: 480px; }
  }