:root {
      --navy: #1B3A4B;
      --navy-deep: #102B38;
      --warm: #F5F4F0;
      --white: #FFFFFF;
      --text: #1A1A1A;
      --muted: #5E6468;
      --border: #E2E0DC;
      --bronze: #8B6F4E;
      --bronze-light: #B99B78;
      --soft-navy: rgba(27, 58, 75, 0.06);
    }
    * { box-sizing: border-box; }
    html,
    body {
      margin: 0;
      min-height: 100%;
      font-family: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
      background: var(--navy);
      color: var(--text);
    }
    body { overflow: hidden; }
    .slides {
      height: 100vh;
      overflow-y: auto;
      scroll-snap-type: y mandatory;
      scroll-behavior: smooth;
    }
    .slide {
      position: relative;
      min-height: 100vh;
      height: 100vh;
      scroll-snap-align: start;
      overflow: hidden;
      display: grid;
      place-items: center;
      padding: clamp(32px, 5vw, 72px);
    }
    .slide::before {
      content: "";
      position: absolute;
      inset: 0;
      pointer-events: none;
      opacity: 0.18;
      background-image: radial-gradient(circle, var(--bronze-light) 1.1px, transparent 1.1px);
      background-size: 32px 32px;
    }
    .slide.light::before,
    .slide.warm::before { display: none; }
    .dark { background: var(--navy); color: var(--white); }
    .deep { background: var(--navy-deep); color: var(--white); }
    .light { background: var(--white); }
    .warm { background: var(--warm); }
    .content {
      position: relative;
      z-index: 1;
      width: min(1120px, 100%);
    }
    .narrow { width: min(920px, 100%); }
    .deck-topline {
      display: inline-flex;
      align-items: center;
      gap: 10px;
      margin-bottom: 24px;
      font-size: 12px;
      line-height: 1.2;
      font-weight: 700;
      color: var(--bronze-light);
      text-transform: uppercase;
      letter-spacing: 0.12em;
    }
    .deck-topline::before {
      content: "";
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: var(--bronze-light);
    }
    .logo {
      display: inline-flex;
      align-items: baseline;
      gap: 2px;
      margin-bottom: 42px;
      color: var(--white);
      font-size: 28px;
      line-height: 1;
      font-weight: 700;
      letter-spacing: 0.03em;
    }
    .dot { color: var(--bronze-light); }
    .hero-line {
      margin-bottom: 24px;
      color: var(--bronze-light);
      font-size: clamp(18px, 2vw, 24px);
      line-height: 1.3;
      font-weight: 600;
    }
    h1,
    h2 {
      font-family: "Source Serif 4", Georgia, serif;
      font-weight: 400;
      letter-spacing: 0;
      margin: 0;
    }
    h1 {
      max-width: 920px;
      font-size: clamp(46px, 7vw, 84px);
      line-height: 1.05;
      color: inherit;
    }
    h2 {
      max-width: 820px;
      font-size: clamp(34px, 4vw, 52px);
      line-height: 1.12;
      color: inherit;
    }
    .subtitle {
      max-width: 760px;
      margin: 28px 0 0;
      color: rgba(255, 255, 255, 0.76);
      font-size: clamp(18px, 2vw, 22px);
      line-height: 1.6;
      font-weight: 300;
    }
    .light .subtitle,
    .warm .subtitle {
      color: var(--muted);
    }
    .panel {
      border: 1px solid rgba(255, 255, 255, 0.16);
      background: rgba(255, 255, 255, 0.08);
      border-radius: 8px;
      padding: clamp(24px, 3vw, 36px);
      box-shadow: 0 20px 60px rgba(0, 0, 0, 0.16);
    }
    .light .panel,
    .warm .panel {
      border-color: var(--border);
      background: var(--white);
      box-shadow: 0 18px 40px rgba(27, 58, 75, 0.08);
    }
    .card h3,
    .metric h3 {
      margin: 0 0 6px;
      font-size: 17px;
      line-height: 1.3;
      letter-spacing: 0;
      font-weight: 650;
      color: inherit;
    }
    .card p,
    .metric p,
    .panel p {
      margin: 0;
      color: rgba(255, 255, 255, 0.68);
      font-size: 15px;
      line-height: 1.55;
    }
    .light .card p,
    .warm .card p,
    .light .metric p,
    .warm .metric p,
    .light .panel p,
    .warm .panel p { color: var(--muted); }
    .section-head {
      margin-bottom: 44px;
    }
    .grid-2,
    .grid-3,
    .grid-4 {
      display: grid;
      gap: 20px;
    }
    .grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
    .grid-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
    .card,
    .metric {
      min-height: 100%;
      border: 1px solid var(--border);
      background: var(--white);
      border-radius: 8px;
      padding: clamp(22px, 2.5vw, 32px);
      box-shadow: 0 16px 36px rgba(27, 58, 75, 0.07);
    }
    .dark .card,
    .deep .card,
    .dark .metric,
    .deep .metric {
      border-color: rgba(255, 255, 255, 0.16);
      background: rgba(255, 255, 255, 0.08);
      box-shadow: none;
    }
    .card-label,
    .metric-label {
      margin: 0 0 18px;
      color: var(--bronze);
      font-size: 12px;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 0.12em;
    }
    .dark .card-label,
    .deep .card-label,
    .dark .metric-label,
    .deep .metric-label { color: var(--bronze-light); }
    .grid-4 .card-label {
      margin-bottom: 24px;
    }
    .problem-grid {
      display: grid;
      grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
      gap: clamp(36px, 6vw, 72px);
      align-items: center;
    }
    .quote {
      padding-left: 28px;
      border-left: 3px solid var(--bronze-light);
      color: rgba(255, 255, 255, 0.78);
      font-family: "Source Serif 4", Georgia, serif;
      font-size: clamp(24px, 3vw, 34px);
      line-height: 1.35;
    }
    .metric-value {
      display: block;
      margin-bottom: 8px;
      font-family: "Source Serif 4", Georgia, serif;
      font-size: clamp(36px, 5vw, 58px);
      line-height: 1;
      color: inherit;
    }
    .roi-layout {
      display: grid;
      grid-template-columns: minmax(0, 0.9fr) minmax(340px, 0.7fr);
      gap: 28px;
      align-items: stretch;
    }
    .roi-controls,
    .roi-card {
      border: 1px solid var(--border);
      background: var(--white);
      border-radius: 8px;
      padding: clamp(24px, 3vw, 32px);
      box-shadow: 0 16px 36px rgba(27, 58, 75, 0.07);
    }
    .input-row {
      display: grid;
      grid-template-columns: minmax(0, 1fr) minmax(160px, 0.42fr);
      gap: 18px;
      align-items: center;
    }
    .input-row + .input-row {
      margin-top: 18px;
    }
    .input-row span {
      color: var(--muted);
      font-size: 14px;
      font-weight: 650;
    }
    .input-shell {
      display: grid;
      grid-template-columns: minmax(0, 1fr) auto;
      align-items: center;
      border: 1px solid var(--border);
      border-radius: 6px;
      background: var(--warm);
      padding-right: 12px;
    }
    .input-row input {
      width: 100%;
      min-height: 46px;
      border: 0;
      background: transparent;
      padding: 0 14px;
      color: var(--text);
      font: inherit;
      font-weight: 700;
    }
    .input-row input:focus {
      outline: none;
    }
    .roi-card {
      display: grid;
      gap: 20px;
    }
    .roi-kicker {
      display: block;
      margin-bottom: 4px;
      color: var(--muted);
      font-size: 13px;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 0.08em;
    }
    .roi-number {
      display: block;
      font-family: "Source Serif 4", Georgia, serif;
      font-size: clamp(34px, 4vw, 54px);
      line-height: 1;
      color: var(--text);
    }
    .proof-context {
      margin-top: 24px;
    }
    .logos {
      display: grid;
      grid-template-columns: repeat(3, minmax(0, 1fr));
      gap: 18px;
      align-items: center;
      margin-top: 28px;
    }
    .logos-large {
      margin-top: 0;
      margin-bottom: 22px;
    }
    .logo-card {
      min-height: 108px;
      display: grid;
      place-items: center;
      border: 1px solid var(--border);
      background: var(--white);
      border-radius: 8px;
      padding: 24px;
    }
    .logo-card img {
      max-width: 160px;
      max-height: 44px;
      object-fit: contain;
    }
    .logos-large .logo-card {
      min-height: 126px;
    }
    .logos-large .logo-card img {
      max-width: 190px;
      max-height: 52px;
    }
    .timeline {
      display: grid;
      grid-template-columns: repeat(4, minmax(0, 1fr));
      gap: 16px;
      margin-top: 40px;
    }
    .timeline .card {
      background: rgba(255, 255, 255, 0.08);
      border-color: rgba(255, 255, 255, 0.16);
      box-shadow: none;
    }
    .nav {
      position: fixed;
      right: 28px;
      top: 50%;
      transform: translateY(-50%);
      z-index: 10;
      display: grid;
      gap: 12px;
    }
    .nav button {
      width: 42px;
      height: 42px;
      border: 1px solid rgba(139, 111, 78, 0.28);
      border-radius: 50%;
      background: rgba(139, 111, 78, 0.08);
      color: var(--bronze);
      cursor: pointer;
      line-height: 1;
      transition: background 160ms ease, border-color 160ms ease, color 160ms ease, opacity 160ms ease;
    }
    .nav button svg {
      width: 18px;
      height: 18px;
      fill: none;
      stroke: currentColor;
      stroke-width: 2;
    }
    .nav button:hover {
      border-color: rgba(139, 111, 78, 0.5);
      background: rgba(139, 111, 78, 0.14);
    }
    .nav button.on-dark {
      border-color: rgba(255, 255, 255, 0.3);
      background: rgba(255, 255, 255, 0.09);
      color: var(--white);
    }
    .nav button.on-dark:hover {
      border-color: rgba(255, 255, 255, 0.55);
      background: rgba(255, 255, 255, 0.16);
    }
    .nav button.disabled {
      opacity: 0.25;
      pointer-events: none;
    }
    .counter {
      position: fixed;
      right: 32px;
      bottom: 26px;
      z-index: 10;
      color: rgba(139, 111, 78, 0.55);
      font-size: 12px;
      font-weight: 700;
      letter-spacing: 0.12em;
    }
    .counter.on-dark {
      color: rgba(255, 255, 255, 0.45);
    }
    @media (max-width: 980px) {
      body { overflow: auto; }
      .slides {
        height: auto;
        overflow: visible;
        scroll-snap-type: none;
      }
      .slide {
        height: auto;
        min-height: 100svh;
        overflow: visible;
        place-items: start;
      }
      .problem-grid,
      .grid-2,
      .grid-3,
      .grid-4,
      .roi-layout,
      .timeline,
      .logos {
        grid-template-columns: 1fr;
      }
      .nav,
      .counter { display: none; }
    }