:root {
        --main: #4671e8;
        --main-dark: #29519b;
        --bg: #f7f9fd;
      }
      body {
        background: var(--bg);
        margin: 0;
        font-family: "Segoe UI", Arial, sans-serif;
        color: #222;
      }
      .container {
        max-width: 430px;
        margin: 38px auto 0 auto;
        background: #fff;
        border-radius: 17px;
        box-shadow: 0 4px 22px #4671e824;
        padding: 29px 17px 22px 17px;
      }
      .logo {
        font-size: 1.22em;
        font-weight: bold;
        text-align: center;
        color: var(--main-dark);
        margin-bottom: 8px;
      }
      .desc {
        text-align: center;
        color: #315ba7;
        margin-bottom: 15px;
        font-size: 1.03em;
      }
      textarea {
        width: 100%;
        min-height: 140px;
        font-size: 1.09em;
        border: 1.2px solid #a4c9fa;
        border-radius: 9px;
        padding: 12px;
        background: #fafdff;
        color: #222;
        resize: vertical;
        margin-bottom: 11px;
        font-family: "Fira Mono", "Menlo", monospace;
        transition: border 0.16s;
      }
      textarea:focus {
        border-color: var(--main);
      }
      .btn-row {
        display: flex;
        gap: 10px;
        justify-content: space-between;
        margin-bottom: 11px;
      }
      .action-btn {
        background: var(--main);
        color: #fff;
        border: none;
        border-radius: 8px;
        padding: 10px 0;
        font-size: 1.09em;
        font-weight: bold;
        cursor: pointer;
        flex: 1;
        transition: background 0.15s;
        box-shadow: 0 2px 12px #4671e81a;
      }
      .action-btn:active,
      .action-btn:hover {
        background: var(--main-dark);
      }
      .mini-btn {
        background: #e4eefc;
        color: #2759b0;
        border: none;
        border-radius: 7px;
        font-size: 1em;
        padding: 7px 15px;
        cursor: pointer;
        transition: background 0.12s;
        font-weight: 500;
        margin-left: 5px;
      }
      .mini-btn:active {
        background: #bad0f8;
      }
      .footer {
        color: #789;
        text-align: center;
        font-size: 0.95em;
        margin-top: 16px;
        opacity: 0.9;
      }
      #backBtn {
        position: fixed;
        left: 50%;
        bottom: 32px;
        transform: translateX(-50%);
        background: #4671e8;
        color: #fff;
        font-weight: 700;
        border: none;
        border-radius: 2rem;
        padding: 0.58em 1.5em;
        box-shadow: 0 4px 16px #4671e833;
        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: #29519b;
        transform: translateX(-50%) scale(1.04);
      }
      @media (max-width: 600px) {
        .container {
          max-width: 99vw;
          padding: 12px 2vw 13px 2vw;
        }
        textarea {
          font-size: 1em;
        }
        #backBtn {
          bottom: 18px;
          font-size: 0.98em;
          padding: 0.48em 1em;
        }
      }
      .status-msg {
        color: #41823c;
        font-size: 0.98em;
        text-align: right;
        min-height: 18px;
        margin-bottom: 2px;
        opacity: 0.8;
      }