/* ============================================================
     DESIGN TOKENS
     ============================================================ */
  :root{
    --color-bg:#ffffff;
    --color-surface:#F5F5F5;
    --color-surface-2:#EFEFEF;
    --color-primary:#2E7D32;
    --color-primary-dark:#1F5B23;
    --color-primary-light:#E7F2E8;
    --color-text:#1C1E1C;
    --color-text-muted:#5D6461;
    --color-border:#E3E5E3;
    --radius:16px;
    --radius-sm:10px;
    --shadow-sm:0 2px 8px rgba(20,30,20,0.06);
    --shadow-md:0 8px 24px rgba(20,30,20,0.10);
    --shadow-lg:0 16px 48px rgba(20,30,20,0.14);
    --font-display:'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
    --font-body:'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
    --transition:0.35s cubic-bezier(.4,0,.2,1);
  }
  .vpk-root,
  .vpk-root *,
  .vpk-root *::before,
  .vpk-root *::after{box-sizing:border-box;}
  .vpk-root{
    font-family:var(--font-body);
    color:var(--color-text);
    background:var(--color-bg);
    line-height:1.5;
    -webkit-font-smoothing:antialiased;
  }
  .vpk-root h1,.vpk-root h2,.vpk-root h3{
    font-family:var(--font-display);
    font-weight:700;
    margin:0 0 8px 0;
    letter-spacing:-0.01em;
  }
  .vpk-root p{margin:0;}
  .vpk-container{
    max-width:900px;
    margin:0 auto;
    padding:24px 16px 64px 16px;
  }
  /* ============================================================
     CARD SHELL
     ============================================================ */
  .vpk-card-shell{
    background:var(--color-bg);
    border:1px solid var(--color-border);
    border-radius:var(--radius);
    box-shadow:var(--shadow-md);
    padding:64px 56px;
    position:relative;
    overflow:hidden;
  }
  @media (max-width:640px){
    .vpk-card-shell{padding:28px 20px;}
    .vpk-container{padding:12px 12px 48px 12px;}
  }
  /* ============================================================
     PROGRESS BAR
     ============================================================ */
  .vpk-progress-wrap{
    margin-bottom:28px;
  }
  .vpk-progress-track{
    width:100%;
    height:6px;
    background:var(--color-surface);
    border-radius:999px;
    overflow:hidden;
  }
  .vpk-progress-fill{
    height:100%;
    background:linear-gradient(90deg,var(--color-primary),#4CA452);
    border-radius:999px;
    transition:width var(--transition);
    width:0%;
  }
  .vpk-progress-label{
    display:flex;
    justify-content:space-between;
    font-size:13px;
    color:var(--color-text-muted);
    margin-top:8px;
    font-weight:500;
  }
  /* ============================================================
     STEP TRANSITIONS
     ============================================================ */
  .vpk-step{
    display:none;
    animation:vpkFadeIn 0.45s ease;
  }
  .vpk-step.vpk-active{display:block;}
  @keyframes vpkFadeIn{
    from{opacity:0; transform:translateY(14px);}
    to{opacity:1; transform:translateY(0);}
  }
  .vpk-eyebrow{
    display:inline-block;
    font-size:12px;
    font-weight:700;
    letter-spacing:0.06em;
    text-transform:uppercase;
    color:var(--color-primary);
    background:var(--color-primary-light);
    padding:5px 12px;
    border-radius:999px;
    margin-bottom:16px;
  }
  .vpk-question{
    font-size:26px;
    line-height:1.25;
    margin-bottom:6px;
  }
  .vpk-subtext{
    color:var(--color-text-muted);
    font-size:15px;
    margin-bottom:28px;
  }
  @media (max-width:640px){
    .vpk-question{font-size:21px;}
  }
  /* ============================================================
     WELCOME SCREEN
     ============================================================ */
  .vpk-welcome{
    text-align:center;
    padding:8px 0 4px;
  }
  .vpk-welcome-content{
    max-width:640px;
    margin-left:auto;
    margin-right:auto;
    padding-left:0;
    padding-right:0;
    text-align:center;
  }
  .vpk-welcome-icon{
    width:60px;height:60px;
    margin:0 auto 36px auto;
    display:flex;align-items:center;justify-content:center;
    background:var(--color-primary-light);
    border-radius:50%;
  }
  .vpk-welcome h1{
    font-size:38px;
    line-height:1.2;
    letter-spacing:-0.02em;
    margin:0 0 16px;
  }
  .vpk-welcome-sub{
    color:var(--color-text-muted);
    font-size:18px;
    line-height:1.65;
    max-width:520px;
    margin-top:0;
    margin-bottom:46px;
    margin-left:auto !important;
    margin-right:auto !important;
    padding-left:0;
    padding-right:0;
    text-indent:0;
    text-align:center;
  }
  @media (max-width:640px){
    .vpk-welcome-icon{width:52px;height:52px;margin-bottom:22px;}
    .vpk-welcome h1{font-size:26px;margin-bottom:12px;}
    .vpk-welcome-sub{font-size:15.5px;line-height:1.6;max-width:340px;margin-bottom:30px;}
  }
  /* ============================================================
     BUTTONS
     ============================================================ */
  .vpk-btn{
    margin-top:8px;
    font-family:var(--font-body);
    font-size:16px;
    font-weight:600;
    border:none;
    border-radius:var(--radius-sm);
    padding:16px 30px;
    cursor:pointer;
    transition:transform 0.15s ease, box-shadow 0.15s ease, background 0.15s ease;
    display:inline-flex;
    align-items:center;
    justify-content:center;
    gap:8px;
  }
  .vpk-btn:active{transform:scale(0.98);}
  .vpk-btn-primary{
    min-width:260px;
    background:var(--color-primary);
    color:#fff;
    box-shadow:var(--shadow-sm);
  }
  .vpk-btn-primary,
  .vpk-btn-primary:visited{
    color:#fff;
    text-decoration:none;
  }
  .vpk-btn-primary:hover,
  .vpk-btn-primary:focus,
  .vpk-btn-primary:active{
    color:#fff;
    text-decoration:none;
    background:var(--color-primary-dark);
    box-shadow:var(--shadow-md);
  }
  .vpk-btn-secondary{
    background:var(--color-surface);
    color:var(--color-text);
  }
  .vpk-btn-secondary:hover{
    background:var(--color-surface-2);
  }
  .vpk-btn-full{width:100%;}
  .vpk-btn:disabled{
    opacity:0.45;
    cursor:not-allowed;
  }
  .vpk-btn:focus-visible{
    outline:3px solid #A8D5AA;
    outline-offset:2px;
  }
  .vpk-nav-row{
    display:flex;
    justify-content:space-between;
    gap:12px;
    margin-top:32px;
  }
  .vpk-nav-row .vpk-btn{flex:1;}
  /* ============================================================
     OPTION CARDS (choices)
     ============================================================ */
  .vpk-options{
    display:grid;
    grid-template-columns:1fr;
    gap:12px;
  }
  .vpk-options.vpk-grid-2{
    grid-template-columns:1fr 1fr;
  }
  .vpk-options.vpk-grid-3{
    grid-template-columns:repeat(3,1fr);
  }
  @media (max-width:560px){
    .vpk-options.vpk-grid-2,
    .vpk-options.vpk-grid-3{grid-template-columns:1fr;}
  }
  .vpk-option{
    background:var(--color-surface);
    border:2px solid transparent;
    border-radius:var(--radius-sm);
    padding:18px 20px;
    cursor:pointer;
    text-align:left;
    transition:all 0.2s ease;
    display:flex;
    align-items:center;
    gap:14px;
    font-family:var(--font-body);
    color:var(--color-text);
    min-height:64px;
  }
  .vpk-option:hover{
    background:#EDF4ED;
    transform:translateY(-2px);
    box-shadow:var(--shadow-sm);
  }
  .vpk-option.vpk-selected{
    border-color:var(--color-primary);
    background:var(--color-primary-light);
    box-shadow:var(--shadow-sm);
  }
  .vpk-option-icon{
    width:38px;height:38px;
    flex-shrink:0;
    display:flex;align-items:center;justify-content:center;
    background:#fff;
    border-radius:10px;
    font-size:20px;
  }
  .vpk-option-text{
    display:flex;
    flex-direction:column;
    gap:2px;
  }
  .vpk-option-title{
    font-weight:600;
    font-size:15.5px;
  }
  .vpk-option-desc{
    font-size:13px;
    color:var(--color-text-muted);
  }
  .vpk-option-check{
    margin-left:auto;
    width:22px;height:22px;
    border-radius:50%;
    border:2px solid #C9CEC9;
    flex-shrink:0;
    display:flex;align-items:center;justify-content:center;
    transition:all 0.2s ease;
  }
  .vpk-option.vpk-selected .vpk-option-check{
    background:var(--color-primary);
    border-color:var(--color-primary);
  }
  .vpk-option.vpk-selected .vpk-option-check::after{
    content:'';
    width:6px;height:10px;
    border-right:2px solid #fff;
    border-bottom:2px solid #fff;
    transform:rotate(45deg) translate(-1px,-1px);
  }
  /* ============================================================
     SLIDER
     ============================================================ */
  .vpk-slider-block{
    background:var(--color-surface);
    border-radius:var(--radius);
    padding:32px 24px 26px 24px;
    text-align:center;
  }
  .vpk-slider-value{
    font-size:48px;
    font-weight:700;
    color:var(--color-primary);
    margin-bottom:4px;
    font-variant-numeric:tabular-nums;
  }
  .vpk-slider-value span{
    font-size:22px;
    font-weight:600;
    color:var(--color-text-muted);
    margin-left:4px;
  }
  .vpk-slider-caption{
    color:var(--color-text-muted);
    font-size:14px;
    margin-bottom:26px;
  }
  input[type="range"].vpk-slider{
    -webkit-appearance:none;
    appearance:none;
    width:100%;
    height:8px;
    border-radius:999px;
    background:linear-gradient(90deg,var(--color-primary) 0%,var(--color-primary) var(--pct,50%),#DCE0DC var(--pct,50%),#DCE0DC 100%);
    outline:none;
    cursor:pointer;
  }
  input[type="range"].vpk-slider::-webkit-slider-thumb{
    -webkit-appearance:none;
    width:28px;height:28px;
    border-radius:50%;
    background:#fff;
    border:4px solid var(--color-primary);
    box-shadow:var(--shadow-sm);
    cursor:pointer;
    transition:transform 0.15s ease;
  }
  input[type="range"].vpk-slider::-webkit-slider-thumb:hover{transform:scale(1.1);}
  input[type="range"].vpk-slider::-moz-range-thumb{
    width:28px;height:28px;
    border-radius:50%;
    background:#fff;
    border:4px solid var(--color-primary);
    box-shadow:var(--shadow-sm);
    cursor:pointer;
  }
  .vpk-slider-minmax{
    display:flex;
    justify-content:space-between;
    font-size:13px;
    color:var(--color-text-muted);
    margin-top:10px;
    font-weight:500;
  }
  /* ============================================================
     LOADING / ANALYSIS SCREEN
     ============================================================ */
  .vpk-loading{
    text-align:center;
    padding:64px 20px;
  }
  .vpk-spinner{
    width:64px;height:64px;
    margin:0 auto 36px auto;
    border-radius:50%;
    border:4px solid var(--color-surface);
    border-top-color:var(--color-primary);
    animation:vpkSpin 0.9s linear infinite;
  }
  @keyframes vpkSpin{to{transform:rotate(360deg);}}
  .vpk-loading-title{
    font-size:19px;
    font-weight:600;
    margin-bottom:8px;
  }
  .vpk-loading-sub{
    color:var(--color-text-muted);
    font-size:14px;
  }
  .vpk-loading-dots span{
    display:inline-block;
    width:6px;height:6px;
    border-radius:50%;
    background:var(--color-primary);
    margin:0 2px;
    animation:vpkDot 1.2s ease infinite;
  }
  .vpk-loading-dots span:nth-child(2){animation-delay:0.2s;}
  .vpk-loading-dots span:nth-child(3){animation-delay:0.4s;}
  @keyframes vpkDot{
    0%,80%,100%{opacity:0.25; transform:scale(0.8);}
    40%{opacity:1; transform:scale(1);}
  }
  /* ============================================================
     RESULTS PAGE
     ============================================================ */
  .vpk-results-hero{
    background:linear-gradient(135deg,var(--color-primary) 0%,#245C27 100%);
    border-radius:var(--radius);
    padding:36px 32px;
    color:#fff;
    text-align:center;
    margin-bottom:24px;
    box-shadow:var(--shadow-md);
  }
  .vpk-results-hero-label{
    font-size:13px;
    text-transform:uppercase;
    letter-spacing:0.08em;
    opacity:0.85;
    font-weight:600;
    margin-bottom:10px;
  }
  .vpk-results-hero-value{
    font-size:46px;
    font-weight:700;
    margin-bottom:6px;
  }
  .vpk-results-hero-sub{
    font-size:14.5px;
    opacity:0.9;
    max-width:440px;
    margin:0 auto;
  }
  .vpk-confidence{
    display:inline-flex;
    align-items:center;
    gap:6px;
    background:rgba(255,255,255,0.15);
    border-radius:999px;
    padding:6px 14px;
    font-size:13px;
    font-weight:600;
    margin-top:16px;
  }
  .vpk-stats-grid{
    display:grid;
    grid-template-columns:1fr 1fr;
    gap:12px;
    margin-bottom:24px;
  }
  @media (max-width:560px){
    .vpk-stats-grid{grid-template-columns:1fr 1fr;}
  }
  .vpk-stat-card{
    background:var(--color-surface);
    border-radius:var(--radius-sm);
    padding:18px 16px;
  }
  .vpk-stat-label{
    font-size:12.5px;
    color:var(--color-text-muted);
    font-weight:600;
    margin-bottom:6px;
    text-transform:uppercase;
    letter-spacing:0.03em;
  }
  .vpk-stat-value{
    font-size:22px;
    font-weight:700;
    color:var(--color-text);
  }
  .vpk-explanation{
    background:var(--color-primary-light);
    border-left:4px solid var(--color-primary);
    border-radius:var(--radius-sm);
    padding:18px 20px;
    font-size:14.5px;
    line-height:1.7;
    color:#1F3A20;
    margin-bottom:32px;
  }
  .vpk-section-title{
    font-size:20px;
    margin-bottom:4px;
  }
  .vpk-section-sub{
    color:var(--color-text-muted);
    font-size:14px;
    margin-bottom:18px;
  }
  /* ============================================================
     PRODUCT CARDS
     ============================================================ */
  .vpk-products{
    display:flex;
    flex-direction:column;
    gap:14px;
    margin-bottom:36px;
  }
  .vpk-product-card{
    background:#fff;
    border:1px solid var(--color-border);
    border-radius:var(--radius);
    padding:22px 24px;
    display:flex;
    align-items:center;
    gap:18px;
    box-shadow:var(--shadow-sm);
    transition:all 0.2s ease;
    position:relative;
  }
  .vpk-product-card:hover{
    box-shadow:var(--shadow-md);
    transform:translateY(-2px);
  }
  .vpk-product-card.vpk-best-match{
    border-color:var(--color-primary);
  }
  .vpk-best-badge{
    position:absolute;
    top:-11px;
    left:22px;
    background:var(--color-primary);
    color:#fff;
    font-size:11.5px;
    font-weight:700;
    padding:4px 12px;
    border-radius:999px;
    letter-spacing:0.02em;
  }
  .vpk-product-icon{
    width:56px;height:56px;
    border-radius:14px;
    background:var(--color-surface);
    display:flex;align-items:center;justify-content:center;
    font-size:26px;
    flex-shrink:0;
  }
  .vpk-product-info{flex:1; min-width:0;}
  .vpk-product-brand{
    font-size:12px;
    font-weight:700;
    color:var(--color-primary);
    text-transform:uppercase;
    letter-spacing:0.04em;
    margin-bottom:2px;
  }
  .vpk-product-model{
    font-size:16.5px;
    font-weight:700;
    margin-bottom:4px;
  }
  .vpk-product-note{
    font-size:13.5px;
    color:var(--color-text-muted);
  }
  .vpk-product-cta{
    flex-shrink:0;
    background:var(--color-primary);
    color:#fff;
    text-decoration:none;
    font-weight:600;
    font-size:14.5px;
    padding:13px 20px;
    border-radius:var(--radius-sm);
    white-space:nowrap;
    transition:background 0.15s ease;
    display:inline-flex;
    align-items:center;
    gap:6px;
  }
  .vpk-product-cta:hover{background:var(--color-primary-dark);}
  @media (max-width:560px){
    .vpk-product-card{
      flex-direction:column;
      align-items:flex-start;
      text-align:left;
    }
    .vpk-product-cta{width:100%; justify-content:center;}
  }
  /* ============================================================
     ARTICLE / INTERNAL LINK CARDS
     ============================================================ */
  .vpk-articles{
    display:grid;
    grid-template-columns:repeat(3,1fr);
    gap:12px;
    margin-bottom:20px;
  }
  @media (max-width:640px){
    .vpk-articles{grid-template-columns:1fr;}
  }
  .vpk-article-card{
    background:var(--color-surface);
    border-radius:var(--radius-sm);
    padding:18px;
    text-decoration:none;
    color:var(--color-text);
    transition:all 0.2s ease;
    display:block;
  }
  .vpk-article-card:hover{
    background:var(--color-surface-2);
    transform:translateY(-2px);
  }
  .vpk-article-label{
    font-size:12px;
    color:var(--color-primary);
    font-weight:700;
    text-transform:uppercase;
    letter-spacing:0.03em;
    margin-bottom:8px;
  }
  .vpk-article-title{
    font-size:14.5px;
    font-weight:600;
    line-height:1.4;
  }
  .vpk-restart-row{
    text-align:center;
    margin-top:12px;
  }
  .vpk-restart-link{
    background:none;
    border:none;
    color:var(--color-text-muted);
    font-size:13.5px;
    text-decoration:underline;
    cursor:pointer;
    font-family:var(--font-body);
  }
  .vpk-restart-link:hover{color:var(--color-text);}
  .vpk-disclaimer{
    font-size:11.5px;
    color:#9BA19D;
    text-align:center;
    margin-top:22px;
    line-height:1.5;
  }
  /* Reduced motion */
  @media (prefers-reduced-motion:reduce){
    .vpk-step, .vpk-spinner, .vpk-loading-dots span{animation:none !important;}
  }

/* Mobile polish */
@media (max-width:768px){
.vpk-result-grid,.results-grid,.vpk-stats-grid{
display:grid !important;
grid-template-columns:1fr !important;
gap:16px !important;
}
.vpk-stat-card,.result-card,.stat-card{
min-width:0!important;
width:100%!important;
}
.vpk-nav,.vpk-navigation{
display:flex!important;
gap:12px!important;
}
.vpk-nav .vpk-btn,.vpk-navigation .vpk-btn,.vpk-btn-primary,.vpk-btn-secondary{
flex:1 1 0!important;
min-width:0!important;
padding:16px 18px!important;
font-size:18px!important;
}
.vpk-option-card,.option-card{
padding:18px!important;
}
.vpk-option-card h3,.option-card h3{
font-size:28px!important;
}
.vpk-option-card p,.option-card p{
font-size:18px!important;
}
.vpk-result-hero h2,.result-value{
font-size:54px!important;
line-height:1.1!important;
}
}