:root {
    --bg: #f5f5f5;
    --fg: #111;
    --panel-bg: #ffffff;
    --accent: #ffb000;
    --border-radius: 10px;
    --shadow: 0 4px 12px rgba(0,0,0,0.1);
    --font: -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  }
  
  body {
    margin: 0;
    padding: 20px;
    background: var(--bg);
    color: var(--fg);
    font-family: var(--font);
  }
  
  #page {
    max-width: 1000px;
    margin: 0 auto;
  }
  
  #header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
  }
  
  #titleWrapper h1 {
    margin: 0;
  }
  
  #langThemeWrapper select,
  #langThemeWrapper button {
    margin-left: 8px;
    padding: 6px 10px;
    border-radius: 6px;
    border: 1px solid #555;
    background: var(--panel-bg);
    cursor: pointer;
  }
  
  #server-info {
    background: var(--panel-bg);
    border-radius: var(--border-radius);
    padding: 16px;
    box-shadow: var(--shadow);
  }
  
  #server-info h2 {
    margin-top: 0;
  }
  
  #startSection {
    margin-top: 20px;
  }
  
  #startBtn,
  #changeServerBtn {
    padding: 10px 18px;
    border-radius: 8px;
    border: none;
    background: var(--accent);
    color: #000;
    cursor: pointer;
    font-size: 15px;
  }
  
  #startBtn:disabled {
    opacity: .6;
    cursor: default;
  }
  
  #panels {
    display: grid;
    grid-template-columns: repeat(auto-fit,minmax(160px,1fr));
    grid-gap: 16px;
    margin-top: 24px;
  }
  
  .panel {
    background: var(--panel-bg);
    border-radius: var(--border-radius);
    padding: 16px;
    text-align: center;
    box-shadow: var(--shadow);
  }
  
  .panelTitle {
    font-size: 15px;
    opacity: .8;
  }
  
  .panelValue {
    margin-top: 8px;
    font-size: 32px;
    font-weight: 600;
  }
  
  .panelUnit {
    margin-top: -4px;
    font-size: 13px;
    opacity: .8;
  }
  
  #resultSection {
    margin-top: 24px;
    background: var(--panel-bg);
    border-radius: var(--border-radius);
    padding: 16px;
    box-shadow: var(--shadow);
  }

  #top-info {
    display: grid;
    grid-template-columns: minmax(0,1fr) minmax(0,1fr);
    grid-gap: 20px;
    margin-bottom: 20px;
  }
  
  #client-info,
  #server-info {
    background: var(--panel-bg);
    border-radius: var(--border-radius);
    padding: 16px;
    box-shadow: var(--shadow);
  }
  
  #client-info h2,
  #server-info h2 {
    margin-top: 0;
  }
  
  /* Прогресс-бар */
  #progressSection {
    margin-top: 10px;
    max-width: 320px;
  }
  
  #progressOuter {
    width: 100%;
    height: 10px;
    background: rgba(0,0,0,0.1);
    border-radius: 999px;
    overflow: hidden;
  }
  
  #progressInner {
    width: 0%;
    height: 100%;
    background: var(--accent);
    transition: width 0.2s linear;
  }
  
  #progressLabel {
    margin-top: 4px;
    font-size: 13px;
    opacity: .8;
  }
  
  /* Графики */
  #charts {
    margin-top: 24px;
    display: grid;
    grid-template-columns: repeat(auto-fit,minmax(250px,1fr));
    grid-gap: 16px;
  }
  
  .chart-block {
    background: var(--panel-bg);
    border-radius: var(--border-radius);
    padding: 12px;
    box-shadow: var(--shadow);
  }
  
  .chart-block h3 {
    margin-top: 0;
    font-size: 16px;
  }
  
  .vpn-warning {
    margin-top: 4px;
    font-size: 12px;
    line-height: 1.35;
    background: rgba(255,176,0,0.08);
    border-left: 3px solid var(--accent);
    padding: 6px 8px;
    border-radius: 6px;
  }
  
  .fatal-error {
    margin: 10px 0 16px;
    padding: 10px 12px;
    border-radius: 8px;
    background: rgba(255, 80, 80, 0.12);
    border-left: 3px solid #ff5050;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
  }
  
  .fatal-error-text {
    font-size: 14px;
  }
  
  .fatal-error-btn {
    border: none;
    border-radius: 6px;
    padding: 6px 10px;
    cursor: pointer;
    font-size: 13px;
  }