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

  :root {
    --orange:   #FF6B35;
    --orange-d: #CC4400;
    --navy:     #0D0D1A;
    --card:     #161628;
    --card2:    #1E1E35;
    --border:   #2A2A45;
    --blue:     #2D6A9F;
    --blue-l:   #4A8EC2;
    --green:    #5C8A3C;
    --green-l:  #7AB55A;
    --amber:    #F59E0B;
    --red:      #DC2626;
    --purple:   #8B5CF6;
    --text:     #E8EAF0;
    --muted:    #7A8BAA;
    --code-bg:  #0A0A18;
  }

  html, body {
    width: 100%; height: 100%;
    overflow: hidden;
    background: var(--navy);
    font-family: 'Inter', sans-serif;
    color: var(--text);
    -webkit-font-smoothing: antialiased;
  }

  /* ─── Progress bar ─────────────────────────────────────── */
  #progress {
    position: fixed; top: 0; left: 0; height: 3px;
    background: linear-gradient(90deg, var(--orange), var(--amber));
    transition: width 0.5s cubic-bezier(0.4,0,0.2,1);
    z-index: 1000;
    box-shadow: 0 0 12px var(--orange);
  }

  /* ─── Slide counter ─────────────────────────────────────── */
  #counter {
    position: fixed; bottom: 22px; right: 28px;
    font-size: 13px; color: var(--muted); z-index: 1000;
    font-weight: 500; letter-spacing: 0.05em;
  }

  /* ─── Dot nav ──────────────────────────────────────────── */
  #dots {
    position: fixed; bottom: 18px; left: 50%; transform: translateX(-50%);
    display: flex; gap: 7px; z-index: 1000;
  }
  .dot {
    width: 7px; height: 7px; border-radius: 50%;
    background: var(--border); border: 1px solid var(--muted);
    cursor: pointer; transition: all 0.3s ease;
  }
  .dot.active { background: var(--orange); border-color: var(--orange); transform: scale(1.4); }

  /* ─── Nav arrows ───────────────────────────────────────── */
  .nav-arrow {
    position: fixed; top: 50%; transform: translateY(-50%);
    width: 44px; height: 44px; border-radius: 50%;
    background: rgba(255,107,53,0.12); border: 1px solid rgba(255,107,53,0.3);
    display: flex; align-items: center; justify-content: center;
    cursor: pointer; z-index: 1000; transition: all 0.25s ease;
    color: var(--orange); font-size: 18px;
  }
  .nav-arrow:hover { background: rgba(255,107,53,0.28); transform: translateY(-50%) scale(1.1); }
  #nav-prev { left: 14px; }
  #nav-next { right: 14px; }

  /* ─── Slide container ──────────────────────────────────── */
  #deck { width: 100%; height: 100%; position: relative; overflow: hidden; }

  .slide {
    position: absolute; inset: 0;
    display: flex; flex-direction: column;
    align-items: center; justify-content: flex-start;
    padding: 48px 68px 60px;
    opacity: 0; pointer-events: none;
    transform: translateX(60px);
    transition: opacity 0.42s ease, transform 0.42s cubic-bezier(0.4,0,0.2,1);
    overflow-x: hidden;
    overflow-y: auto;
  }
  .slide.active  { opacity: 1; pointer-events: auto; transform: translateX(0); }
  .slide.exit-left  { opacity: 0 !important; transform: translateX(-60px) !important; pointer-events: none !important; }
  .slide.exit-right { opacity: 0 !important; transform: translateX(60px) !important;  pointer-events: none !important; }

  /* grid bg */
  .slide::before {
    content: ''; position: fixed; inset: 0; pointer-events: none; z-index: -1;
    background-image:
      linear-gradient(rgba(255,107,53,0.025) 1px, transparent 1px),
      linear-gradient(90deg, rgba(255,107,53,0.025) 1px, transparent 1px);
    background-size: 48px 48px;
  }

  /* Center helper */
  .slide-center { display: flex; flex-direction: column; align-items: center; justify-content: center; flex: 1; width: 100%; }

  /* ─── Typography ───────────────────────────────────────── */
  .slide-label {
    font-size: 11px; font-weight: 700; letter-spacing: 0.2em;
    text-transform: uppercase; color: var(--orange); margin-bottom: 8px;
    align-self: flex-start;
    opacity: 0; animation: fadeUp 0.4s ease 0.05s forwards;
  }
  h1 {
    font-size: clamp(34px, 4.5vw, 54px); font-weight: 900;
    line-height: 1.1; text-align: center; letter-spacing: -0.02em;
    background: linear-gradient(135deg, #fff 0%, rgba(255,255,255,0.75) 100%);
    -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
  }
  h1 .hl { -webkit-text-fill-color: var(--orange); }
  h2 {
    font-size: clamp(22px, 3vw, 32px); font-weight: 800;
    letter-spacing: -0.02em; align-self: flex-start;
    background: linear-gradient(135deg, #fff 0%, rgba(255,255,255,0.8) 100%);
    -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
  }
  h3 { font-size: 15px; font-weight: 700; color: #fff; margin-bottom: 4px; }
  p, li { font-size: 13px; line-height: 1.65; color: var(--muted); }
  strong { color: var(--text); }

  .divider {
    width: 44px; height: 3px;
    background: linear-gradient(90deg, var(--orange), transparent);
    border-radius: 2px; margin: 6px 0 14px; align-self: flex-start;
    opacity: 0; animation: fadeUp 0.4s ease 0.15s forwards;
  }

  /* ─── Animations ───────────────────────────────────────── */
  @keyframes fadeUp {
    from { opacity: 0; transform: translateY(16px); }
    to   { opacity: 1; transform: translateY(0); }
  }
  @keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
  @keyframes scaleIn {
    from { opacity: 0; transform: scale(0.85); }
    to   { opacity: 1; transform: scale(1); }
  }
  @keyframes pulse {
    0%, 100% { box-shadow: 0 0 0 0 rgba(255,107,53,0.4); }
    50% { box-shadow: 0 0 0 8px rgba(255,107,53,0); }
  }
  @keyframes floatOrb {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-10px); }
  }
  @keyframes passIn {
    from { opacity: 0; transform: scale(0.5) rotate(-20deg); }
    to   { opacity: 1; transform: scale(1) rotate(0deg); }
  }

  .a1 { opacity: 0; animation: fadeUp 0.45s ease 0.2s forwards; }
  .a2 { opacity: 0; animation: fadeUp 0.45s ease 0.35s forwards; }
  .a3 { opacity: 0; animation: fadeUp 0.45s ease 0.5s forwards; }
  .a4 { opacity: 0; animation: fadeUp 0.45s ease 0.65s forwards; }
  .a5 { opacity: 0; animation: fadeUp 0.45s ease 0.8s forwards; }
  .a6 { opacity: 0; animation: fadeUp 0.45s ease 0.95s forwards; }
  .asc { opacity: 0; animation: scaleIn 0.5s cubic-bezier(0.34,1.56,0.64,1) 0.3s forwards; }

  /* ─── Shared components ────────────────────────────────── */
  .card {
    background: var(--card); border: 1px solid var(--border);
    border-radius: 12px; padding: 16px 18px; position: relative; overflow: hidden;
  }
  .card::before {
    content: ''; position: absolute; top: 0; left: 0; right: 0; height: 2px;
    background: linear-gradient(90deg, var(--orange), transparent);
  }

  .tag {
    display: inline-flex; align-items: center; gap: 4px;
    padding: 2px 9px; border-radius: 999px;
    font-size: 10.5px; font-weight: 700; letter-spacing: 0.06em;
  }
  .to { background: rgba(255,107,53,0.15); color: var(--orange); border: 1px solid rgba(255,107,53,0.3); }
  .tg { background: rgba(92,138,60,0.15);  color: var(--green-l); border: 1px solid rgba(92,138,60,0.3); }
  .tr { background: rgba(220,38,38,0.15);  color: #f87171; border: 1px solid rgba(220,38,38,0.3); }
  .tb { background: rgba(45,106,159,0.15); color: var(--blue-l); border: 1px solid rgba(45,106,159,0.3); }
  .ta { background: rgba(245,158,11,0.15); color: var(--amber); border: 1px solid rgba(245,158,11,0.3); }
  .tp { background: rgba(139,92,246,0.15); color: #a78bfa; border: 1px solid rgba(139,92,246,0.3); }

  code, .mono { font-family: 'JetBrains Mono', monospace; font-size: 12px; }
  .cb {
    background: var(--code-bg); border: 1px solid var(--border);
    border-radius: 9px; padding: 11px 15px;
    font-family: 'JetBrains Mono', monospace; font-size: 12px; line-height: 1.8; color: #c8d0e0;
  }
  .cb .kw  { color: var(--orange); }
  .cb .str { color: var(--green-l); }
  .cb .cm  { color: var(--muted); font-style: italic; }
  .cb .hl  { color: var(--amber); }

  .status-pill {
    display: inline-flex; align-items: center; gap: 5px;
    font-size: 10.5px; padding: 2px 8px; border-radius: 6px; margin-top: 5px;
  }
  .ok   { background: rgba(92,138,60,0.15); color: var(--green-l); }
  .warn { background: rgba(245,158,11,0.15); color: var(--amber); }
  .stop { background: rgba(220,38,38,0.15); color: #f87171; }

  /* timeline */
  .tl { display: grid; gap: 7px; width: 100%; }
  .tl5 { grid-template-columns: repeat(5,1fr); }
  .tl-step {
    background: var(--card); border: 1px solid var(--border);
    border-radius: 9px; padding: 9px 10px 11px; text-align: center;
    opacity: 0; animation: fadeUp 0.35s ease forwards;
  }
  .tl-step .sn {
    width: 26px; height: 26px; border-radius: 50%; margin: 0 auto 5px;
    background: linear-gradient(135deg, var(--orange), var(--orange-d));
    display: flex; align-items: center; justify-content: center;
    font-size: 10px; font-weight: 800; color: #fff;
  }
  .tl-step .sname { font-size: 10.5px; font-weight: 700; color: var(--text); }
  .tl-step .sdesc { font-size: 9.5px; color: var(--muted); margin-top: 2px; }
  .tl-gate { border-color: rgba(255,107,53,0.35); }
  .tl-gate .sn { background: linear-gradient(135deg, #DC2626, #991B1B); }

  /* tier items */
  .tier-item {
    display: grid; grid-template-columns: 90px 1fr auto;
    gap: 10px; align-items: center;
    background: var(--card); border: 1px solid var(--border);
    border-radius: 9px; padding: 10px 12px;
    border-left: 4px solid; opacity: 0; animation: fadeUp 0.4s ease forwards;
  }
  .t1c { border-left-color: var(--green); }
  .t2c { border-left-color: var(--blue); }
  .t3c { border-left-color: var(--amber); }
  .t4c { border-left-color: var(--orange); }
  .t5c { border-left-color: var(--red); }
  .tier-label { font-size: 11px; font-weight: 800; }
  .t1c .tier-label { color: var(--green-l); }
  .t2c .tier-label { color: var(--blue-l); }
  .t3c .tier-label { color: var(--amber); }
  .t4c .tier-label { color: var(--orange); }
  .t5c .tier-label { color: #f87171; }
  .tier-desc { font-size: 11.5px; color: var(--muted); }
  .tier-desc strong { color: var(--text); }

  /* val table */
  .vtbl { width: 100%; border-collapse: collapse; }
  .vtbl th, .vtbl td { padding: 7px 10px; text-align: left; font-size: 11.5px; border-bottom: 1px solid var(--border); }
  .vtbl th { color: var(--muted); font-weight: 700; font-size: 10.5px; }

  /* check lists */
  .chk { list-style: none; }
  .chk li { display: flex; gap: 7px; align-items: flex-start; font-size: 12px; color: var(--muted); padding: 3px 0; border-bottom: 1px solid rgba(255,255,255,0.04); }
  .chk li::before { content: '✓'; color: var(--green-l); font-weight: 700; flex-shrink: 0; }
  .chk.trigger li::before { content: '⚡'; color: var(--amber); }
  .chk.sections li::before { content: '§'; color: var(--orange); font-size: 10px; margin-top: 2px; }

  /* wf steps */
  .wf-step { display: flex; align-items: center; gap: 10px; padding: 9px 12px; border-radius: 9px; margin-bottom: 7px; background: var(--card); border: 1px solid var(--border); font-size: 12px; }
  .wf-num { width: 24px; height: 24px; border-radius: 50%; flex-shrink: 0; background: rgba(255,107,53,0.15); border: 1px solid rgba(255,107,53,0.4); display: flex; align-items: center; justify-content: center; font-size: 10px; font-weight: 800; color: var(--orange); }

  /* orange glow text */
  .og { background: linear-gradient(90deg, var(--orange), var(--amber)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }

  /* ─── SLIDE 1 ───────────────────────────────────────────── */
  .hero-orb {
    width: 180px; height: 180px; border-radius: 50%;
    background: radial-gradient(circle at 35% 35%, rgba(255,107,53,0.3), transparent 70%);
    border: 1px solid rgba(255,107,53,0.2);
    display: flex; align-items: center; justify-content: center;
    font-size: 64px; margin-bottom: 24px;
    animation: floatOrb 4s ease-in-out infinite, scaleIn 0.7s cubic-bezier(0.34,1.56,0.64,1) 0.1s both;
    position: relative;
  }
  .hero-orb::after {
    content: ''; position: absolute; inset: -14px; border-radius: 50%;
    border: 1px solid rgba(255,107,53,0.15); animation: pulse 2.5s ease-in-out infinite;
  }

  /* ─── SLIDE 4 — Test Cases ─────────────────────────────── */
  .tc-grid { display: flex; flex-direction: column; gap: 8px; width: 100%; }
  .tc-card {
    display: grid; grid-template-columns: 60px 1fr auto auto auto;
    gap: 10px; align-items: center;
    background: var(--card); border: 1px solid var(--border);
    border-radius: 10px; padding: 10px 14px;
    opacity: 0; animation: fadeUp 0.4s ease forwards;
  }
  .tc-id { font-family: 'JetBrains Mono', monospace; font-size: 11px; font-weight: 700; color: var(--orange); }
  .tc-input { font-size: 12px; color: var(--text); }
  .tc-pass {
    font-size: 13px; font-weight: 900;
    opacity: 0; animation: passIn 0.5s cubic-bezier(0.34,1.56,0.64,1) forwards;
  }
  .tc-pass.pass { color: var(--green-l); }
  .tc-pass.fail { color: #f87171; }

  /* ─── MCP diagram ──────────────────────────────────────── */
  .mcp-layout {
    display: grid; grid-template-columns: 1fr 70px 1fr;
    gap: 14px; align-items: center; width: 100%;
  }
  .mcp-source {
    background: var(--card); border: 1px solid var(--border);
    border-radius: 11px; padding: 12px 14px; text-align: center;
  }
  .mcp-center { display: flex; flex-direction: column; align-items: center; gap: 5px; }
  .mcp-core {
    width: 68px; height: 68px; border-radius: 50%;
    background: radial-gradient(circle, rgba(255,107,53,0.18), transparent);
    border: 2px solid var(--orange);
    display: flex; align-items: center; justify-content: center;
    font-size: 24px; animation: pulse 2s ease-in-out infinite;
  }

  /* ─── 5-tier vertical bars ─────────────────────────────── */
  .tier-rule { font-size: 13px; font-weight: 700; background: rgba(255,107,53,0.08); border: 1px solid rgba(255,107,53,0.25); border-radius: 9px; padding: 9px 14px; margin-bottom: 10px; display: flex; align-items: center; gap: 8px; }

  /* ─── Checklist cats ───────────────────────────────────── */
  .cl-cats { display: grid; grid-template-columns: repeat(5,1fr); gap: 9px; width: 100%; }
  .cl-cat {
    background: var(--card); border: 1px solid var(--border);
    border-radius: 11px; padding: 12px 10px; text-align: center;
    opacity: 0; animation: scaleIn 0.45s cubic-bezier(0.34,1.56,0.64,1) forwards;
  }
  .cl-count { font-size: 28px; font-weight: 900; color: var(--orange); line-height: 1; }
  .cl-name  { font-size: 11.5px; font-weight: 700; color: var(--text); margin-top: 3px; }
  .cl-items { font-size: 10px; color: var(--muted); margin-top: 5px; text-align: left; }
  .cl-items li { padding: 1px 0; display: flex; gap: 4px; list-style: none; }
  .cl-items li::before { content: '·'; color: var(--orange); }

  /* ─── Publish flow ─────────────────────────────────────── */
  .pflow { display: flex; align-items: stretch; width: 100%; }
  .pf-step { flex: 1; background: var(--card); border: 1px solid var(--border); padding: 13px 11px; text-align: center; font-size: 11px; position: relative; }
  .pf-step:not(:last-child)::after { content: '▶'; position: absolute; right: -12px; top: 50%; transform: translateY(-50%); color: var(--orange); font-size: 14px; z-index: 10; }
  .pf-step:first-child { border-radius: 9px 0 0 9px; }
  .pf-step:last-child  { border-radius: 0 9px 9px 0; }
  .pf-icon { font-size: 22px; display: block; margin-bottom: 4px; }
  .region-grid { display: grid; grid-template-columns: repeat(4,1fr); gap: 7px; width: 100%; margin-top: 12px; }
  .region-box { background: var(--card); border: 1px solid var(--border); border-radius: 8px; padding: 9px; text-align: center; opacity: 0; animation: fadeUp 0.4s ease forwards; }
  .r-flag { font-size: 20px; }
  .r-name { font-size: 11.5px; font-weight: 700; color: var(--text); margin-top: 3px; }
  .r-path { font-size: 10px; color: var(--muted); font-family: monospace; }

  /* ─── benefits grid ────────────────────────────────────── */
  .ben-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 11px; width: 100%; }
  .ben-card { background: var(--card); border: 1px solid var(--border); border-radius: 11px; padding: 15px 14px; opacity: 0; animation: scaleIn 0.45s cubic-bezier(0.34,1.56,0.64,1) forwards; }
  .ben-icon { font-size: 24px; margin-bottom: 7px; display: block; }
  .ben-card h3 { font-size: 13.5px; margin-bottom: 5px; }
  .ben-card p  { font-size: 11.5px; color: var(--muted); line-height: 1.55; }

  /* diagram phases */
  .dphases { display: flex; border: 1px solid var(--border); border-radius: 9px; overflow: hidden; margin-top: 12px; }
  .dp { flex: 1; padding: 11px 13px; text-align: center; border-right: 1px solid var(--border); font-size: 11.5px; }
  .dp:last-child { border-right: none; }
  .dp .ph { font-weight: 800; font-size: 18px; }

  /* ─── Full vs Lite compact ─────────────────────────────── */
  .fvl { display: flex; gap: 14px; width: 100%; align-items: flex-start; }
  .fvl-col { flex: 1; background: var(--card); border: 1px solid var(--border); border-radius: 12px; padding: 14px 16px; min-width: 0; }
  .fvl-col.full { border-top: 3px solid var(--orange); }
  .fvl-col.lite { border-top: 3px solid var(--blue-l); }
  .fvl-col h3 { font-size: 15px; margin-bottom: 3px; }
  .fvl-sub { font-size: 10.5px; color: var(--muted); margin-bottom: 8px; }
  .fvl-divider { font-size: 11px; font-weight: 700; color: var(--muted); text-transform: uppercase; letter-spacing: 0.1em; margin: 10px 0 6px; }
  .section-tags { display: flex; flex-wrap: wrap; gap: 5px; margin-top: 5px; }
  .section-tags .s { display: inline-block; background: rgba(255,107,53,0.08); border: 1px solid rgba(255,107,53,0.2); border-radius: 5px; padding: 2px 7px; font-size: 10px; color: var(--muted); }
  .section-tags .s.hi { background: rgba(255,107,53,0.15); color: var(--orange); }