:root{
    --bg: #F6F5F1;
    --card: #FFFFFF;
    --ink: #16171A;
    --ink-soft: #6C6E76;
    --ink-faint: #A2A4AC;
    --line: #E7E5DE;
    --accent: #0E6B57;
    --accent-soft: #E4F1EC;
    --accent-deep: #084C3E;
    --radius: 16px;
    --shadow: 0 1px 2px rgba(20,20,20,0.04), 0 8px 24px rgba(20,20,20,0.05);
  }

  *{ box-sizing: border-box; }

  body{
    margin:0;
    min-height:100vh;
    background: var(--bg);
    background-image:
      radial-gradient(circle at 1px 1px, rgba(20,20,20,0.05) 1px, transparent 0);
    background-size: 22px 22px;
    font-family: 'Inter', -apple-system, sans-serif;
    color: var(--ink);
    padding: 40px 16px 64px;
  }

  .page{
    width: 100%;
    max-width: 720px;
    margin: 0 auto;
  }

  .wrap{
    width:100%;
    max-width: 440px;
    margin: 0 auto;
  }

  /* Header */
  .header{
    text-align: center;
    max-width: 560px;
    margin: 0 auto 28px;
  }
  .eyebrow{
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--accent);
    margin: 0 0 10px;
  }
  h1{
    font-family: 'Inter Tight', 'Inter', sans-serif;
    font-size: 32px;
    font-weight: 700;
    letter-spacing: -0.01em;
    margin: 0 0 12px;
    color: var(--ink);
  }
  .lede{
    font-size: 15px;
    line-height: 1.6;
    color: var(--ink-soft);
    margin: 0;
  }

  /* Ad slots */
  .ad-slot{
    max-width: 440px;
    margin: 0 auto 28px;
    text-align: center;
  }
  .ad-slot .ad-label{
    font-size: 10.5px;
    font-weight: 600;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--ink-faint);
    margin: 0 0 6px;
  }
  .ad-slot .ad-box{
    background: #EFEDE6;
    border: 1px dashed var(--line);
    border-radius: 10px;
    min-height: 90px;
    display:flex;
    align-items:center;
    justify-content:center;
    font-size: 12px;
    color: var(--ink-faint);
  }
  .ad-slot.leaderboard .ad-box{ min-height: 90px; }
  .ad-slot.rectangle{ max-width: 300px; }
  .ad-slot.rectangle .ad-box{ min-height: 250px; }

  .card{
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 24px;
  }

  /* Toggle */
  .toggle{
    position: relative;
    display: grid;
    grid-template-columns: 1fr 1fr;
    background: var(--bg);
    border: 1px solid var(--line);
    border-radius: 999px;
    padding: 4px;
    margin-bottom: 24px;
  }
  .toggle-thumb{
    position: absolute;
    top: 4px; left: 4px;
    width: calc(50% - 4px);
    height: calc(100% - 8px);
    background: var(--ink);
    border-radius: 999px;
    transition: transform 0.28s cubic-bezier(.4,0,.2,1);
  }
  .toggle[data-mode="remove"] .toggle-thumb{
    transform: translateX(100%);
  }
  .toggle button{
    position: relative;
    z-index: 1;
    border: none;
    background: transparent;
    padding: 10px 12px;
    font-family: inherit;
    font-size: 13.5px;
    font-weight: 600;
    color: var(--ink-soft);
    cursor: pointer;
    border-radius: 999px;
    transition: color 0.2s ease;
  }
  .toggle button.active{
    color: #fff;
  }

  /* Field */
  .field{
    margin-bottom: 20px;
  }
  .field label{
    display:block;
    font-size: 12.5px;
    font-weight: 600;
    color: var(--ink-soft);
    margin-bottom: 8px;
  }

  .amount-input{
    display:flex;
    align-items:center;
    background: var(--bg);
    border: 1.5px solid var(--line);
    border-radius: 12px;
    padding: 4px 4px 4px 16px;
    transition: border-color 0.15s ease, background 0.15s ease;
  }
  .amount-input:focus-within{
    border-color: var(--accent);
    background: #fff;
  }
  .amount-input .rupee{
    font-family: 'Inter Tight', sans-serif;
    font-size: 20px;
    font-weight: 600;
    color: var(--ink-faint);
    margin-right: 6px;
  }
  .amount-input input{
    flex:1;
    border: none;
    background: transparent;
    outline: none;
    font-family: 'Inter Tight', sans-serif;
    font-size: 22px;
    font-weight: 600;
    color: var(--ink);
    padding: 12px 12px 12px 0;
    width: 100%;
    min-width: 0;
    -moz-appearance: textfield;
  }
  .amount-input input::-webkit-outer-spin-button,
  .amount-input input::-webkit-inner-spin-button{
    -webkit-appearance: none;
    margin: 0;
  }

  /* Rate pills */
  .rate-grid{
    display:grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 8px;
  }
  .rate-pill{
    border: 1.5px solid var(--line);
    background: var(--bg);
    border-radius: 10px;
    padding: 10px 4px;
    font-family: 'Inter Tight', sans-serif;
    font-size: 14px;
    font-weight: 600;
    color: var(--ink-soft);
    cursor: pointer;
    text-align:center;
    transition: all 0.15s ease;
  }
  .rate-pill:hover{
    border-color: var(--ink-faint);
  }
  .rate-pill.active{
    background: var(--accent-soft);
    border-color: var(--accent);
    color: var(--accent-deep);
  }

  hr{
    border: none;
    border-top: 1px solid var(--line);
    margin: 24px 0;
  }

  /* Results */
  .results{
    display: grid;
    gap: 10px;
  }
  .row{
    display:flex;
    align-items:center;
    justify-content: space-between;
    font-size: 14px;
  }
  .row .k{
    color: var(--ink-soft);
  }
  .row .v{
    font-family: 'Inter Tight', sans-serif;
    font-weight: 600;
    color: var(--ink);
    font-variant-numeric: tabular-nums;
  }

  .total-card{
    margin-top: 6px;
    background: var(--accent-deep);
    border-radius: 12px;
    padding: 18px 20px;
    display:flex;
    align-items:baseline;
    justify-content: space-between;
  }
  .total-card .k{
    font-size: 13px;
    font-weight: 600;
    color: rgba(255,255,255,0.68);
  }
  .total-card .v{
    font-family: 'Inter Tight', sans-serif;
    font-size: 26px;
    font-weight: 700;
    color: #fff;
    font-variant-numeric: tabular-nums;
    letter-spacing: -0.01em;
  }

  .footnote{
    text-align:center;
    font-size: 12px;
    color: var(--ink-faint);
    margin-top: 18px;
  }

  /* Features */
  .section-heading{
    text-align:center;
    max-width: 560px;
    margin: 56px auto 28px;
  }
  .section-heading h2{
    font-family: 'Inter Tight', 'Inter', sans-serif;
    font-size: 22px;
    font-weight: 700;
    letter-spacing: -0.01em;
    margin: 0 0 8px;
  }
  .section-heading p{
    font-size: 14px;
    line-height: 1.6;
    color: var(--ink-soft);
    margin: 0;
  }

  .features{
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 14px;
  }
  .feature{
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: 14px;
    padding: 18px;
  }
  .feature .icon{
    width: 34px;
    height: 34px;
    border-radius: 9px;
    background: var(--accent-soft);
    display:flex;
    align-items:center;
    justify-content:center;
    margin-bottom: 12px;
  }
  .feature .icon svg{
    width: 18px;
    height: 18px;
    stroke: var(--accent-deep);
  }
  .feature h3{
    font-family: 'Inter Tight', sans-serif;
    font-size: 14.5px;
    font-weight: 600;
    margin: 0 0 4px;
  }
  .feature p{
    font-size: 13px;
    line-height: 1.55;
    color: var(--ink-soft);
    margin: 0;
  }

  /* About */
  .about{
    max-width: 560px;
    margin: 56px auto 0;
  }
  .about h2{
    font-family: 'Inter Tight', 'Inter', sans-serif;
    font-size: 22px;
    font-weight: 700;
    letter-spacing: -0.01em;
    margin: 0 0 14px;
    text-align: center;
  }
  .about p{
    font-size: 14px;
    line-height: 1.7;
    color: var(--ink-soft);
    margin: 0 0 14px;
  }
  .about p:last-child{ margin-bottom: 0; }

  @media (max-width: 380px){
    .rate-grid{ grid-template-columns: repeat(3, 1fr); }
  }
  @media (max-width: 520px){
    .features{ grid-template-columns: 1fr; }
    h1{ font-size: 26px; }
  }