:root {
  --light: #dfecf1;
  --white: #f6f8f9;
  --border: #d0e0f0;
  --border-subtle: #d0e0f060;
  --ink-light: #ece9e6;
  --medium-gray: #c8bedc;
  --ink-dark: #05285a;
  --ink-dark-hover: #0a3c7b;
  --dark: #0e182a;
  --shadow: #c8bedc;
  --body-bg: linear-gradient(100deg, var(--dark), #210047);
  --light-bg: linear-gradient(-45deg, var(--light), var(--white));
  --button-bg: #39ff14;
  --button-bg-hover: #00ff66;
  --button-shadow: #196f04;
  --button-shadow-hover: #39ff1490;
}

html, body {
  background: var(--body-bg);
  color: var(--ink-light);
}

body {
  max-width: 1000px;
  margin: 2em auto;
  font-family: "Oxygen", Verdana, Geneva, Noto Sans, sans-serif, Apple Color Emoji, Segoe UI Emoji, Segoe UI Symbol, Noto Color Emoji;

  h1 {
    margin-bottom: 0.5em;
  }

  a {
    color: var(--medium-gray);
    transition: color 0.2s;

    &:hover, &:focus {
      color: var(--white);
    }
  }

  .lead {
    font-size: 1.2em;
    margin-bottom: 1em;
  }

  .hidden {
    display: none;
  }

  form#constantsForm {
    background: var(--light-bg);
    color: var(--ink-dark);
    border-radius: 1.2em;
    box-shadow: 0 2px 12px var(--shadow);
    padding: 0.5em 2em 1.5em 2em;
    margin-bottom: 2em;

    .form-section {
      margin-bottom: 0.2em;

      .form-section-title {
        font-weight: bold;
        margin-bottom: 0.5em;
        display: block;
      }

      .form-row {
        display: flex;
        flex-wrap: wrap;
        align-items: flex-start;
        gap: 1em;
        margin-bottom: 0.7em;

        label {
          flex: 1 1 0;
          max-width: 240px;
        }

        &.flex-col {
          display: flex;
          flex-direction: column;
          gap: 0.5em;

          .battery-config-block {
            border-bottom: 2px solid var(--border);
            margin-bottom: 1.2em;
            padding-bottom: 1.2em;

            .flex-row {
              display: flex;
              flex-direction: row;
              gap: 0.5em;
              align-items: flex-start;
              width: 100%;
            }

            .battery-title, .battery-field.spacer {
              width: 100px;
              font-weight: bold;
              flex: 0 0 100px;
              align-self: flex-start;
              margin-top: 0.2em;
            }

            .battery-field {
              flex: 1 1 0;
              display: flex;
              flex-direction: column;

              label {
                width: fit-content;
              }
            }

            .battery-field.spacer {
              visibility: hidden;
            }
          }
        }
      }

      &.form-section-row {
        display: flex;
        flex-direction: row;
        gap: 2em;
        align-items: flex-start;

        .form-section-col {
          flex: 1 1 0;
          min-width: 220px;
          max-width: 400px;
          display: flex;
          flex-direction: column;

          label {
            flex: 1 1 0;
            max-width: 320px;
          }
        }
      }

      label {
        display: flex;
        flex-direction: column;
        font-size: 1em;
        font-weight: 500;
        gap: 0.1em;
        width: 50%;
        min-width: 140px;
      }

      input[type="number"],
      input[type="text"],
      input[type="file"] {
        border: 1px solid var(--border);
        border-radius: 0.4em;
        padding: 0.4em 0.7em;
        font-size: 1em;
        background: #fff;
        margin-top: 0.2em;
        margin-bottom: 0.2em;
        transition: border 0.2s;
      }

      input[type="number"]:focus,
      input[type="text"]:focus {
        border: 1.5px solid var(--button-bg);
        outline: none;
      }

      input[type="file"] {
        padding: 0.2em 0.2em;
        background: none;
      }

      input[type="number"],
      input[type="text"] {
        width: 100%;
        min-width: 0;
        box-sizing: border-box;
      }
    }

    button#calculateBtn {
      background: var(--button-bg);
      color: var(--ink-dark);
      border: none;
      border-radius: 2em;
      padding: 0.6em 2em;
      font-size: 1.1em;
      font-weight: bold;
      box-shadow: 0 4px 12px var(--button-shadow);
      transition: background 0.2s, color 0.2s, box-shadow 0.2s;
      cursor: pointer;
      margin-left: 1em;

      &:hover, &:focus {
        background: var(--button-bg-hover);
        color: var(--ink-dark-hover);
        box-shadow: 0 2px 8px var(--button-shadow-hover);
      }
    }
  }

  .usage-stats-container {
    display: flex;
    justify-content: center;
    width: 100%;

    .usage-stats {
      margin-bottom: 2em;
      border-radius: 1em;
      box-shadow: 0 2px 10px var(--shadow);
      color: var(--ink-light);
      width: 100%;
      justify-content: center;
      padding: 1.5em;
      max-width: 420px;
      min-width: 360px;

      .usage-stats-title {
        font-size: 1.15em;
        font-weight: bold;
        margin-bottom: 0.7em;
        letter-spacing: 0.02em;
        text-align: left;
      }

      .usage-stats-header {
        font-size: 1.25em;
        font-weight: bold;
        margin-bottom: 0.7em;
        letter-spacing: 0.02em;
      }

      .usage-stats-table {
        display: flex;
        flex-direction: column;
        gap: 0.2em;
      }

      .usage-stats-table-vertical {
        display: flex;
        flex-direction: column;
        gap: 0.1em;
        width: 100%;
      }

      .usage-stats-row {
        display: flex;
        flex-direction: row;
        align-items: center;
        padding: 0.4em 0.2em;
        font-size: 1em;
        border-bottom: 1px solid var(--border-subtle);

        &:last-child {
          border-bottom: none;
        }
      }

      .usage-stats-label {
        flex: 1 1 60%;
        font-weight: 500;
        padding-right: 1em;
        text-align: left;
      }

      .usage-stats-row > div:last-child {
        flex: 1 1 40%;
        text-align: right;
        font-family: monospace;
        font-weight: 600;
      }
    }
  }

  .results {
    box-shadow: 0 2px 10px var(--shadow);
    border-radius: 1em;
    padding: 1.5em;

    .results-list {
      display: flex;
      flex-direction: column;
      gap: 0.5em;
      overflow-x: auto;
      width: 100%;

      .results-header, .results-row {
        display: flex;
        flex-direction: row;
        gap: 0.2em;
        align-items: center;
        min-width: 900px;
        width: fit-content;
      }

      .results-header {
        font-weight: bold;
        padding: 0.2em;
        border-radius: 0.5em 0.5em 0 0;
      }

      .results-row {
        border-bottom: 1px solid var(--border-subtle);
        padding: 0.2em 0;
      }

      .results-cell {
        flex: 1 1 0;
        min-width: 140px;
      }
    }

    .results-explanation {
      margin-top: 1.5em;
      font-size: 0.98em;
      color: var(--ink-light);
      max-width: 900px;
    }

    .results-explanation ul {
      margin-top: 0.5em;
    }

    #workingMsg {
      margin-top: 1em;
    }
  }

  .battery-config-explanation {
    margin-bottom: 1em;

    summary {
      cursor: pointer;
      font-weight: 500;
    }

    .battery-config-explanation-list {
      display: flex;
      flex-direction: column;
      gap: 0.2em;
      margin-top: 0.7em;

      .battery-config-explanation-item {
        margin-bottom: 0;

        h5 {
          margin: 0;
          font-weight: 600;
        }

        p {
          margin: 0;
          font-size: 0.9em;
        }
      }
    }
  }

  .charge-warning {
    color: #b30000;
    font-weight: bold;
    font-size: 0.98em;
    margin-left: 0.3em;
  }
}

@media (max-width: 900px) {
  .usage-stats-row, .usage-stats-row-header {
    min-width: 700px;
    font-size: 0.95em;
  }

  .usage-stats-header {
    font-size: 1.1em;
  }
}

@media (max-width: 700px) {
  .usage-stats {
    max-width: 98vw;
    min-width: 0;
    padding: 1em 0.5em 1em 0.5em;
  }

  .usage-stats-row, .usage-stats-row-header {
    min-width: 500px;
    font-size: 0.9em;
  }

  .usage-stats-header {
    font-size: 1em;
  }

  .usage-stats-label {
    font-size: 0.98em;
    padding-right: 0.5em;
  }

  .usage-stats-row > div:last-child {
    font-size: 0.98em;
  }
}