:root {
    --bg: #0a0a0f;
    --surface: #111118;
    --surface2: #1a1a25;
    --border: #2a2a3a;
    --text: #e8e8f0;
    --muted: #6b6b8a;
    --accent: #7c6fff;
    --accent2: #ff6b9d;
    --accent3: #00d4aa;
    --accent4: #ffa94d;
    --lld: #7c6fff;
    --hld: #00d4aa;
    --phase0: #ffa94d;
    --phase2: #ff6b9d;
    --phase3: #e879f9;
    --phase4: #38bdf8;
  }

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

  body {
    background: var(--bg);
    color: var(--text);
    font-family: 'Syne', sans-serif;
    min-height: 100vh;
    overflow-x: hidden;
  }

  /* HEADER */
  header {
    padding: 48px 60px 32px;
    border-bottom: 1px solid var(--border);
    background: linear-gradient(135deg, #0a0a0f 0%, #12101f 100%);
    position: relative;
    overflow: hidden;
  }
  header::before {
    content: '';
    position: absolute;
    top: -60px; right: -60px;
    width: 300px; height: 300px;
    background: radial-gradient(circle, rgba(124,111,255,0.12) 0%, transparent 70%);
    pointer-events: none;
  }
  header::after {
    content: '';
    position: absolute;
    bottom: -40px; left: 200px;
    width: 200px; height: 200px;
    background: radial-gradient(circle, rgba(0,212,170,0.08) 0%, transparent 70%);
    pointer-events: none;
  }
  .header-tag {
    font-family: 'JetBrains Mono', monospace;
    font-size: 11px;
    color: var(--accent);
    letter-spacing: 3px;
    text-transform: uppercase;
    margin-bottom: 12px;
  }
  header h1 {
    font-size: clamp(28px, 4vw, 48px);
    font-weight: 800;
    line-height: 1.1;
    background: linear-gradient(135deg, #fff 30%, var(--accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 16px;
  }
  .header-meta {
    display: flex;
    gap: 24px;
    flex-wrap: wrap;
  }
  .meta-pill {
    font-family: 'JetBrains Mono', monospace;
    font-size: 12px;
    padding: 6px 14px;
    border-radius: 20px;
    border: 1px solid var(--border);
    color: var(--muted);
  }
  .meta-pill span { color: var(--text); }

  /* TABS */
  .tabs {
    display: flex;
    gap: 0;
    padding: 0 60px;
    border-bottom: 1px solid var(--border);
    background: var(--surface);
    position: sticky;
    top: 0;
    z-index: 100;
  }
  .tab {
    padding: 18px 28px;
    cursor: pointer;
    font-size: 13px;
    font-weight: 600;
    color: var(--muted);
    border-bottom: 2px solid transparent;
    transition: all 0.2s;
    letter-spacing: 0.5px;
    white-space: nowrap;
  }
  .tab:hover { color: var(--text); }
  .tab.active {
    color: var(--accent);
    border-bottom-color: var(--accent);
  }

  /* CONTENT */
  .view { display: none; padding: 48px 60px; }
  .view.active { display: block; }

  /* LEGEND */
  .legend {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
    margin-bottom: 40px;
    padding: 16px 20px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px;
  }
  .legend-item {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 12px;
    font-family: 'JetBrains Mono', monospace;
    color: var(--muted);
  }
  .legend-dot {
    width: 10px; height: 10px;
    border-radius: 50%;
    flex-shrink: 0;
  }

  /* ===================== VIEW 1: GANTT ===================== */
  .gantt-container { overflow-x: auto; }
  .gantt-header-row {
    display: grid;
    grid-template-columns: 200px repeat(24, 1fr);
    gap: 2px;
    margin-bottom: 8px;
  }
  .gantt-week-label {
    font-family: 'JetBrains Mono', monospace;
    font-size: 10px;
    color: var(--muted);
    text-align: center;
    padding: 4px;
  }
  .gantt-row {
    display: grid;
    grid-template-columns: 200px repeat(24, 1fr);
    gap: 2px;
    margin-bottom: 4px;
    align-items: center;
    min-height: 36px;
  }
  .gantt-label {
    font-size: 11px;
    color: var(--text);
    padding: 4px 8px;
    font-family: 'JetBrains Mono', monospace;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
  }
  .gantt-cell {
    height: 30px;
    border-radius: 2px;
    background: var(--surface2);
  }
  .gantt-cell.filled {
    border-radius: 4px;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
  }
  .gantt-cell.filled::after {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: 4px;
    opacity: 0.15;
  }
  .gantt-section-title {
    grid-column: 1 / -1;
    font-size: 10px;
    font-weight: 700;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--muted);
    padding: 16px 0 4px;
    font-family: 'JetBrains Mono', monospace;
  }

  /* ===================== VIEW 2: DEPENDENCY GRAPH ===================== */
  .dep-view { max-width: 1200px; }
  .dep-phase {
    margin-bottom: 48px;
    position: relative;
  }
  .dep-phase-title {
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 3px;
    text-transform: uppercase;
    font-family: 'JetBrains Mono', monospace;
    margin-bottom: 20px;
    padding: 8px 16px;
    border-radius: 6px;
    display: inline-block;
  }
  .dep-nodes {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    position: relative;
  }
  .dep-node {
    padding: 10px 16px;
    border-radius: 10px;
    border: 1px solid var(--border);
    font-size: 12px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    position: relative;
    background: var(--surface);
  }
  .dep-node:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(0,0,0,0.4); }
  .dep-node .node-tag {
    font-family: 'JetBrains Mono', monospace;
    font-size: 9px;
    display: block;
    opacity: 0.6;
    margin-top: 2px;
  }
  .dep-connector {
    text-align: center;
    padding: 8px 0;
    color: var(--muted);
    font-size: 20px;
  }
  .dep-tracks {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
    margin-bottom: 48px;
  }
  .dep-track {
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 24px;
    background: var(--surface);
  }
  .dep-track-title {
    font-size: 14px;
    font-weight: 700;
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    gap: 8px;
  }
  .track-badge {
    font-family: 'JetBrains Mono', monospace;
    font-size: 10px;
    padding: 3px 8px;
    border-radius: 4px;
  }
  .dep-module {
    padding: 10px 14px;
    border-radius: 8px;
    margin-bottom: 8px;
    font-size: 12px;
    font-weight: 600;
    border-left: 3px solid transparent;
    background: var(--surface2);
    display: flex;
    justify-content: space-between;
    align-items: center;
  }
  .dep-module .week-tag {
    font-family: 'JetBrains Mono', monospace;
    font-size: 10px;
    color: var(--muted);
  }
  .dep-arrow {
    text-align: center;
    color: var(--muted);
    font-size: 16px;
    margin: 4px 0;
  }
  .unlock-badge {
    font-family: 'JetBrains Mono', monospace;
    font-size: 9px;
    padding: 2px 6px;
    border-radius: 4px;
    background: rgba(124,111,255,0.1);
    color: var(--accent);
    border: 1px solid rgba(124,111,255,0.2);
  }

  /* ===================== VIEW 3: MILESTONE ===================== */
  .milestone-view { max-width: 900px; margin: 0 auto; }
  .milestone-track {
    position: relative;
    padding-left: 32px;
  }
  .milestone-track::before {
    content: '';
    position: absolute;
    left: 8px; top: 0; bottom: 0;
    width: 2px;
    background: linear-gradient(to bottom, var(--phase0), var(--lld), var(--hld), var(--phase2), var(--phase3), var(--phase4));
  }
  .milestone {
    position: relative;
    margin-bottom: 40px;
  }
  .milestone-dot {
    position: absolute;
    left: -28px;
    top: 16px;
    width: 16px; height: 16px;
    border-radius: 50%;
    border: 2px solid var(--bg);
    z-index: 1;
  }
  .milestone-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 24px;
    transition: all 0.2s;
    cursor: pointer;
  }
  .milestone-card:hover {
    border-color: var(--accent);
    transform: translateX(4px);
  }
  .milestone-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 12px;
    flex-wrap: wrap;
    gap: 8px;
  }
  .milestone-title {
    font-size: 16px;
    font-weight: 700;
  }
  .milestone-week {
    font-family: 'JetBrains Mono', monospace;
    font-size: 11px;
    padding: 4px 10px;
    border-radius: 6px;
    background: var(--surface2);
    color: var(--muted);
    white-space: nowrap;
  }
  .milestone-desc {
    font-size: 13px;
    color: var(--muted);
    line-height: 1.6;
    margin-bottom: 16px;
  }
  .milestone-deliverables {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
  }
  .deliverable {
    font-size: 11px;
    padding: 4px 10px;
    border-radius: 6px;
    font-family: 'JetBrains Mono', monospace;
    border: 1px solid var(--border);
    color: var(--muted);
  }
  .deliverable.project { color: var(--accent4); border-color: rgba(255,169,77,0.3); background: rgba(255,169,77,0.05); }
  .deliverable.task { color: var(--accent3); border-color: rgba(0,212,170,0.3); background: rgba(0,212,170,0.05); }
  .deliverable.mock { color: var(--accent2); border-color: rgba(255,107,157,0.3); background: rgba(255,107,157,0.05); }
  .deliverable.capstone { color: var(--accent); border-color: rgba(124,111,255,0.3); background: rgba(124,111,255,0.05); }

  /* Stats bar */
  .stats-bar {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 16px;
    margin-bottom: 40px;
  }
  .stat-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 16px;
    text-align: center;
  }
  .stat-number {
    font-size: 28px;
    font-weight: 800;
    font-family: 'JetBrains Mono', monospace;
  }
  .stat-label {
    font-size: 11px;
    color: var(--muted);
    margin-top: 4px;
    letter-spacing: 0.5px;
  }

  /* Topic pills in gantt tooltip */
  .tooltip {
    position: fixed;
    background: var(--surface2);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 12px 16px;
    font-size: 12px;
    max-width: 240px;
    pointer-events: none;
    z-index: 999;
    display: none;
    box-shadow: 0 16px 48px rgba(0,0,0,0.6);
  }
  .tooltip.show { display: block; }
  .tooltip-title { font-weight: 700; margin-bottom: 4px; }
  .tooltip-body { color: var(--muted); line-height: 1.5; font-size: 11px; font-family: 'JetBrains Mono', monospace; }

  @media (max-width: 768px) {
    header { padding: 32px 24px 24px; }
    .tabs { padding: 0 24px; overflow-x: auto; }
    .view { padding: 32px 24px; }
    .dep-tracks { grid-template-columns: 1fr; }
  }