:root {
        --main: #1875d1;
        --main-dark: #0e4775;
        --bg: #f8faff;
      }
      body {
        background: var(--bg);
        margin: 0;
        font-family: "Segoe UI", Arial, sans-serif;
        color: #234;
      }
      .container {
        max-width: 480px;
        margin: 42px auto 0 auto;
        background: #fff;
        border-radius: 18px;
        box-shadow: 0 4px 22px #1875d133;
        padding: 30px 18px 22px 18px;
      }
      .logo {
        font-size: 1.25em;
        font-weight: bold;
        text-align: center;
        color: var(--main-dark);
        margin-bottom: 10px;
      }
      .desc {
        text-align: center;
        color: #1e589e;
        margin-bottom: 17px;
        font-size: 1.04em;
      }
      .form-row {
        margin-bottom: 13px;
        display: flex;
        flex-direction: column;
        gap: 3px;
      }
      .form-row label {
        font-size: 1em;
        color: #186a9a;
        font-weight: 500;
      }
      .form-row input,
      .form-row select {
        padding: 8px 10px;
        font-size: 1.05em;
        border: 1.1px solid #b6d5ef;
        border-radius: 7px;
        background: #fafdff;
        color: #234;
      }
      .action-btn {
        background: var(--main);
        color: #fff;
        border: none;
        border-radius: 8px;
        padding: 13px 0;
        width: 100%;
        font-size: 1.13em;
        font-weight: bold;
        cursor: pointer;
        margin-top: 9px;
        margin-bottom: 13px;
        box-shadow: 0 2px 12px #1875d120;
        transition: background 0.15s;
      }
      .action-btn:active { background: var(--main-dark); }
      .result-block {
        background: #f7fafd;
        border: 1.2px solid #c2e1fa;
        border-radius: 9px;
        padding: 18px 13px 12px 13px;
        margin-bottom: 7px;
        color: #1975be;
        font-size: 1.11em;
        text-align: center;
      }
      .footer {
        color: #789;
        text-align: center;
        font-size: 0.93em;
        margin-top: 16px;
      }
      #backBtn {
        position: fixed;
        left: 50%;
        bottom: 32px;
        transform: translateX(-50%);
        background: #1875d1;
        color: #fff;
        font-weight: 700;
        border: none;
        border-radius: 2rem;
        padding: 0.58em 1.5em;
        box-shadow: 0 4px 16px #1875d133;
        font-size: 1.09em;
        text-decoration: none;
        cursor: pointer;
        letter-spacing: 0.01em;
        transition: background 0.15s, transform 0.12s;
        z-index: 2000;
      }
      #backBtn:hover { background: #0e4775; transform: translateX(-50%) scale(1.04); }
      @media (max-width: 600px) {
        .container { max-width: 99vw; padding: 12px 2vw 14px 2vw; }
        #backBtn { bottom: 18px; font-size: 0.98em; padding: 0.48em 1em; }
      }
      .table-block { margin: 15px 0 8px 0; overflow-x: auto; }
      table {
        width: 100%;
        border-collapse: collapse;
        font-size: 0.98em;
        background: #fff;
      }
      th, td {
        border: 1px solid #e3ecf8;
        padding: 5px 8px;
        text-align: right;
      }
      th {
        background: #e9f3ff;
        color: #1975be;
        font-weight: 600;
      }
      td.year {
        text-align: center;
        color: #1975be;
        font-weight: 500;
      }
      .legend {
        text-align: right;
        font-size: 0.98em;
        margin: 5px 0 0 0;
      }
      .legend span {
        display: inline-block;
        width: 14px;
        height: 11px;
        margin-right: 5px;
        border-radius: 3px;
        vertical-align: middle;
      }
      /* Chart */
      #chart {
        width: 100%;
        max-width: 450px;
        height: 230px;
        background: #fafdff;
        border-radius: 13px;
        margin: 16px auto 7px auto;
        box-shadow: 0 1px 8px #1875d118;
        display: block;
      }
      section#faq { margin-top: 30px; }
      section#faq h2 { margin-bottom: 13px; color: #1875d1; font-size: 1.11em; text-align: center; }
      section#faq dt { font-weight: bold; margin-top: 8px; }
      section#faq dd { margin: 0 0 7px 0; font-size: 0.99em; color: #1e589e; }