:root {
      --bg-base:       #F8F9FC;
      --bg-surface:    #EEF2F8;
      --bg-card:       #FFFFFF;
      --accent:        #006E8A;
      --accent-glow:   rgba(0,110,138,.08);
      --accent-border: rgba(0,110,138,.22);
      --green:         #00904A;
      --green-glow:    rgba(0,144,74,.08);
      --green-border:  rgba(0,144,74,.22);
      --red:           #C0392B;
      --red-glow:      rgba(192,57,43,.07);
      --red-border:    rgba(192,57,43,.2);
      --amber:         #C05621;
      --text-1:        #0F1C2E;
      --text-2:        #485E7A;
      --text-3:        #7A90AB;
      --border:        rgba(0,0,0,.09);
      --r-sm:  6px;
      --r-md:  12px;
      --r-lg:  20px;
      --r-xl:  28px;
      --shadow-cta:    0 8px 40px rgba(0,110,138,.22);
      --font:  'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
      --tr:    .25s ease;
    }

    *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
    html { scroll-behavior: smooth; }
    body { font-family: var(--font); background: var(--bg-base); color: var(--text-1); line-height: 1.65; -webkit-font-smoothing: antialiased; }
    a { color: inherit; text-decoration: none; }
    button { cursor: pointer; font-family: var(--font); }

    .c { max-width: 1080px; margin: 0 auto; padding: 0 24px; }

    /* ── NAV ── */
    .nav { background: rgba(248,249,252,.96); backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px); border-bottom: 1px solid var(--border); padding: 16px 0; position: sticky; top: 0; z-index: 100; }
    .nav-inner { display: flex; align-items: center; justify-content: space-between; gap: 16px; }
    .nav-logo { font-size: 16px; font-weight: 700; letter-spacing: -.02em; }
    .nav-logo em { font-style: normal; color: var(--accent); }
    .nav-back { display: inline-flex; align-items: center; gap: 6px; font-size: 13px; font-weight: 600; color: var(--text-2); transition: color var(--tr); }
    .nav-back:hover { color: var(--accent); }

    /* ── HEADER ── */
    .page-header { padding: 52px 0 44px; border-bottom: 1px solid var(--border); }
    .lbl { display: inline-block; font-size: 11px; font-weight: 700; letter-spacing: .12em; text-transform: uppercase; color: var(--accent); margin-bottom: 14px; }
    .page-header h1 { font-size: clamp(26px, 4.5vw, 42px); font-weight: 900; line-height: 1.1; letter-spacing: -.03em; margin-bottom: 14px; }
    .page-header p { font-size: 17px; color: var(--text-2); line-height: 1.75; max-width: 600px; }

    /* ── MAIN LAYOUT ── */
    .calc-layout { display: grid; grid-template-columns: 1fr 420px; gap: 40px; padding: 40px 0 80px; align-items: start; }

    /* ── INPUT CARDS ── */
    .input-card { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--r-xl); padding: 32px; margin-bottom: 20px; }
    .input-card-title { font-size: 13px; font-weight: 700; text-transform: uppercase; letter-spacing: .1em; color: var(--text-3); margin-bottom: 28px; display: flex; align-items: center; gap: 8px; }
    .input-card-title span { font-size: 16px; }

    .input-group { margin-bottom: 28px; }
    .input-group:last-child { margin-bottom: 0; }
    .input-row { display: flex; justify-content: space-between; align-items: baseline; margin-bottom: 10px; }
    .input-label { font-size: 14px; font-weight: 600; color: var(--text-1); }
    .input-sublabel { font-size: 12px; color: var(--text-3); margin-top: 2px; }
    .input-val { font-size: 18px; font-weight: 800; color: var(--accent); letter-spacing: -.02em; transition: color .2s; }
    .input-val.flash { color: var(--green); }

    /* Slider */
    input[type=range] {
      -webkit-appearance: none; appearance: none;
      width: 100%; height: 5px; border-radius: 50px;
      background: var(--bg-surface); outline: none; cursor: pointer;
    }
    input[type=range]::-webkit-slider-thumb {
      -webkit-appearance: none; appearance: none;
      width: 20px; height: 20px; border-radius: 50%;
      background: var(--accent); border: 3px solid white;
      box-shadow: 0 2px 8px rgba(0,110,138,.3);
      transition: transform .15s, box-shadow .15s;
    }
    input[type=range]::-webkit-slider-thumb:hover { transform: scale(1.15); box-shadow: 0 3px 12px rgba(0,110,138,.4); }
    input[type=range]::-moz-range-thumb {
      width: 20px; height: 20px; border-radius: 50%;
      background: var(--accent); border: 3px solid white;
      box-shadow: 0 2px 8px rgba(0,110,138,.3);
    }
    .slider-track { position: relative; margin-top: 6px; }
    .slider-fill { position: absolute; top: 0; left: 0; height: 5px; border-radius: 50px; background: var(--accent); pointer-events: none; transition: width .1s; }
    .slider-range { display: flex; justify-content: space-between; margin-top: 6px; font-size: 11px; color: var(--text-3); font-weight: 500; }

    /* Assumptions toggle */
    .assumptions-toggle { display: flex; align-items: center; gap: 8px; font-size: 13px; font-weight: 600; color: var(--text-2); background: none; border: none; padding: 14px 0 0; width: 100%; transition: color var(--tr); }
    .assumptions-toggle:hover { color: var(--accent); }
    .assumptions-toggle svg { transition: transform .3s; flex-shrink: 0; }
    .assumptions-toggle.open svg { transform: rotate(180deg); }
    .assumptions-body { overflow: hidden; transition: max-height .4s ease, opacity .4s ease; max-height: 0; opacity: 0; }
    .assumptions-body.open { max-height: 600px; opacity: 1; }
    .assumptions-inner { padding-top: 20px; border-top: 1px solid var(--border); margin-top: 14px; }
    .assumption-note { font-size: 12px; color: var(--text-3); margin-bottom: 20px; line-height: 1.6; padding: 10px 14px; background: var(--bg-surface); border-radius: var(--r-sm); }

    /* ── RESULTS PANEL ── */
    .results-wrap { position: sticky; top: 76px; }

    .results-card { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--r-xl); overflow: hidden; }

    .results-header { padding: 24px 28px 20px; border-bottom: 1px solid var(--border); background: var(--bg-surface); }
    .results-header-lbl { font-size: 11px; font-weight: 700; letter-spacing: .1em; text-transform: uppercase; color: var(--text-3); margin-bottom: 6px; }

    .headline-nums { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; padding: 24px 28px; border-bottom: 1px solid var(--border); }
    .hn { }
    .hn-lbl { font-size: 11px; font-weight: 600; text-transform: uppercase; letter-spacing: .08em; color: var(--text-3); margin-bottom: 5px; }
    .hn-val { font-size: 26px; font-weight: 900; letter-spacing: -.03em; line-height: 1; font-variant-numeric: tabular-nums; transition: color .3s; }
    .hn-val.apparent { color: var(--text-2); }
    .hn-val.real { color: var(--red); }
    .hn-sub { font-size: 12px; color: var(--text-3); margin-top: 4px; }

    /* Waterfall breakdown */
    .breakdown { padding: 20px 28px; border-bottom: 1px solid var(--border); }
    .breakdown-title { font-size: 12px; font-weight: 700; text-transform: uppercase; letter-spacing: .08em; color: var(--text-3); margin-bottom: 16px; }

    .brow { margin-bottom: 12px; }
    .brow:last-child { margin-bottom: 0; }
    .brow-head { display: flex; justify-content: space-between; align-items: baseline; margin-bottom: 5px; }
    .brow-label { font-size: 13px; color: var(--text-2); display: flex; align-items: center; gap: 6px; }
    .brow-dot { width: 8px; height: 8px; border-radius: 50%; flex-shrink: 0; }
    .brow-val { font-size: 13px; font-weight: 700; font-variant-numeric: tabular-nums; }
    .brow-bar-bg { height: 6px; background: var(--bg-surface); border-radius: 50px; overflow: hidden; }
    .brow-bar { height: 6px; border-radius: 50px; transition: width .5s cubic-bezier(.4,0,.2,1); width: 0%; }

    .c-gain  { color: var(--green);  } .bg-gain  { background: var(--green);  } .dot-gain  { background: var(--green); }
    .c-ai    { color: var(--accent); } .bg-ai    { background: var(--accent); } .dot-ai    { background: var(--accent); }
    .c-rev   { color: var(--red);    } .bg-rev   { background: var(--red);    } .dot-rev   { background: var(--red); }
    .c-sec   { color: var(--amber);  } .bg-sec   { background: var(--amber);  } .dot-sec   { background: var(--amber); }

    .net-row { display: flex; justify-content: space-between; align-items: center; padding: 14px 0 0; border-top: 1px solid var(--border); margin-top: 14px; }
    .net-lbl { font-size: 13px; font-weight: 700; }
    .net-val { font-size: 20px; font-weight: 900; font-variant-numeric: tabular-nums; transition: color .3s; }

    /* Optimized */
    .optimized { padding: 20px 28px; background: linear-gradient(135deg, rgba(0,144,74,.04) 0%, rgba(0,110,138,.04) 100%); border-bottom: 1px solid var(--border); }
    .opt-badge { display: inline-flex; align-items: center; gap: 6px; font-size: 11px; font-weight: 700; text-transform: uppercase; letter-spacing: .08em; color: var(--green); background: var(--green-glow); border: 1px solid var(--green-border); border-radius: 50px; padding: 3px 10px; margin-bottom: 14px; }
    .opt-compare { display: grid; grid-template-columns: 1fr auto 1fr; align-items: center; gap: 12px; margin-bottom: 16px; }
    .opt-side { }
    .opt-side-lbl { font-size: 11px; color: var(--text-3); font-weight: 600; margin-bottom: 4px; }
    .opt-side-val { font-size: 20px; font-weight: 900; letter-spacing: -.02em; font-variant-numeric: tabular-nums; transition: color .3s; }
    .opt-side-val.before { color: var(--red); }
    .opt-side-val.after  { color: var(--green); }
    .opt-arrow { color: var(--text-3); font-size: 18px; text-align: center; }
    .opt-uplift { background: var(--green-glow); border: 1px solid var(--green-border); border-radius: var(--r-md); padding: 12px 16px; text-align: center; }
    .opt-uplift-val { font-size: 22px; font-weight: 900; color: var(--green); letter-spacing: -.02em; font-variant-numeric: tabular-nums; }
    .opt-uplift-lbl { font-size: 12px; color: var(--text-2); margin-top: 2px; }

    /* Insights */
    .insights { padding: 20px 28px; border-bottom: 1px solid var(--border); }
    .insight { display: flex; gap: 10px; margin-bottom: 10px; }
    .insight:last-child { margin-bottom: 0; }
    .insight-ico { font-size: 14px; flex-shrink: 0; margin-top: 1px; }
    .insight-text { font-size: 13px; color: var(--text-2); line-height: 1.6; }
    .insight-text strong { color: var(--text-1); }

    /* CTA */
    .results-cta { padding: 20px 28px; }
    .cta-btn { display: flex; align-items: center; justify-content: center; gap: 8px; width: 100%; padding: 14px; font-size: 14px; font-weight: 700; background: var(--accent); color: white; border: none; border-radius: 50px; transition: background var(--tr), transform var(--tr), box-shadow var(--tr); }
    .cta-btn:hover { background: #0088AA; transform: translateY(-2px); box-shadow: var(--shadow-cta); }
    .cta-note { margin-top: 10px; text-align: center; font-size: 12px; color: var(--text-3); }
    .cta-note a { color: var(--accent); font-weight: 600; }

    /* Executive unlock */
    .analysis-shell { position: relative; }
    .analysis-shell.is-locked .analysis-deep { filter: blur(12px); pointer-events: none; user-select: none; }
    .analysis-shell.is-locked .analysis-overlay { display: flex; }
    .analysis-overlay {
      position: absolute; inset: 0; display: none; align-items: flex-end;
      padding: 24px; background: linear-gradient(180deg, rgba(248,249,252,.08) 0%, rgba(248,249,252,.68) 24%, rgba(248,249,252,.96) 100%);
    }
    .analysis-panel {
      width: 100%; background: var(--bg-card); border: 1px solid var(--accent-border);
      border-radius: var(--r-lg); padding: 22px 22px 18px; box-shadow: 0 20px 50px rgba(15,28,46,.12);
    }
    .analysis-kicker {
      display: inline-flex; align-items: center; gap: 8px; padding: 5px 10px;
      border-radius: 50px; background: var(--accent-glow); color: var(--accent);
      font-size: 11px; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; margin-bottom: 14px;
    }
    .analysis-panel h3 { font-size: 20px; line-height: 1.2; letter-spacing: -.02em; margin-bottom: 10px; }
    .analysis-panel p { font-size: 14px; color: var(--text-2); line-height: 1.7; }
    .analysis-meta { margin-top: 10px; font-size: 12px; color: var(--text-3); line-height: 1.6; }

    /* Disclaimer */
    .disclaimer { font-size: 12px; color: var(--text-3); line-height: 1.6; padding: 24px 0 60px; max-width: 700px; }

    /* ── MOBILE ── */
    @media (max-width: 840px) {
      .calc-layout { grid-template-columns: 1fr; gap: 0; }
      .results-wrap { position: static; top: auto; order: -1; margin-bottom: 24px; }
      .page-header { padding: 36px 0 28px; }
    }
    @media (max-width: 500px) {
      .input-card { padding: 24px 20px; }
      .headline-nums { grid-template-columns: 1fr 1fr; gap: 12px; }
      .hn-val { font-size: 21px; }
      .breakdown, .optimized, .insights, .results-cta { padding: 16px 20px; }
      .analysis-overlay { padding: 16px; }
    }