.sdt {
    --sdt-primary: #06b6d4;
    --sdt-secondary: #0891b2;
    --sdt-accent: #06d6a6;
    --sdt-low: #10b981;
    --sdt-mod: #f59e0b;
    --sdt-high: #ef9311;
    --sdt-critical: #dc2626;
    --sdt-bg: #fff;
    --sdt-border: rgba(6, 182, 212, 0.2);
    --sdt-divider: rgba(6, 182, 212, 0.1);
    --sdt-text: #0f172a;
    --sdt-muted: #64748b;
    --sdt-preset-bg: rgba(6, 182, 212, 0.07);
    --sdt-preset-border: rgba(6, 182, 212, 0.18);
    --sdt-input-bg: #ecfeff;
    --sdt-input-border: rgba(6, 182, 212, 0.25);

    max-width: 860px;
    margin: 0 auto;
    padding: 1rem;
  }

  
  .sdt__card {
    background: var(--sdt-bg);
    border: 2px solid var(--sdt-border);
    border-radius: 2.5rem;
    box-shadow: 0 20px 60px rgba(6, 182, 212, 0.12);
    overflow: hidden;
  }

  
  .sdt__section {
    padding: 2.5rem;
  }

  .sdt__section--bordered {
    border-top: 1px solid var(--sdt-divider);
  }

  .sdt__section-title {
    display: block;
    font-size: 0.8rem;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 3px;
    color: var(--sdt-secondary);
    margin: 0 0 1.5rem;
  }

  
  .sdt__slider-row {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    margin-bottom: 1.25rem;
  }

  .sdt__slider {
    flex: 1;
    -webkit-appearance: none;
    appearance: none;
    height: 8px;
    border-radius: 4px;
    background: linear-gradient(90deg, var(--sdt-primary) 50%, rgba(6,182,212,0.15) 50%);
    outline: none;
    cursor: pointer;
  }

  .sdt__slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 26px;
    height: 26px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--sdt-primary) 0%, var(--sdt-secondary) 100%);
    cursor: pointer;
    box-shadow: 0 3px 12px rgba(6, 182, 212, 0.45);
    transition: transform 0.15s ease;
  }

  .sdt__slider::-webkit-slider-thumb:hover { transform: scale(1.15); }

  .sdt__slider::-moz-range-thumb {
    width: 26px; height: 26px;
    border-radius: 50%; border: none;
    background: linear-gradient(135deg, var(--sdt-primary) 0%, var(--sdt-secondary) 100%);
    cursor: pointer;
    box-shadow: 0 3px 12px rgba(6, 182, 212, 0.45);
  }

  .sdt__number {
    width: 5rem;
    background: var(--sdt-input-bg);
    border: 2px solid var(--sdt-input-border);
    border-radius: 0.875rem;
    padding: 0.5rem 0.75rem;
    font-size: 1.75rem;
    font-weight: 900;
    color: var(--sdt-primary);
    text-align: center;
    outline: none;
    transition: border-color 0.2s ease;
  }

  .sdt__number:focus { border-color: var(--sdt-primary); box-shadow: 0 0 0 3px rgba(6,182,212,0.12); }
  .sdt__number::-webkit-inner-spin-button,
  .sdt__number::-webkit-outer-spin-button { -webkit-appearance: none; }
  .sdt__number[type="number"] { -moz-appearance: textfield; }

  .sdt__presets {
    display: flex;
    gap: 0.75rem;
  }

  .sdt__preset {
    background: var(--sdt-preset-bg);
    border: 1px solid var(--sdt-preset-border);
    border-radius: 2rem;
    padding: 0.45rem 1.25rem;
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--sdt-secondary);
    cursor: pointer;
    transition: all 0.2s ease;
  }

  .sdt__preset:hover, .sdt__preset--active {
    background: linear-gradient(135deg, var(--sdt-primary) 0%, var(--sdt-secondary) 100%);
    border-color: transparent;
    color: #fff;
    box-shadow: 0 4px 14px rgba(6, 182, 212, 0.3);
  }

  
  .sdt__section--result {
    background: linear-gradient(135deg, var(--sdt-primary) 0%, var(--sdt-secondary) 100%);
  }

  .sdt__result-inner {
    display: flex;
    align-items: center;
    gap: 3rem;
  }

  .sdt__ring-wrap {
    flex-shrink: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.75rem;
  }

  .sdt__ring {
    width: 150px;
    height: 150px;
    border-radius: 50%;
    background: conic-gradient(#10b981 75%, rgba(255,255,255,0.15) 0);
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.5s ease;
  }

  .sdt__ring-hole {
    width: 102px;
    height: 102px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--sdt-primary) 0%, var(--sdt-secondary) 100%);
    position: absolute;
  }

  .sdt__fatigue-label {
    font-size: 0.9rem;
    font-weight: 900;
    color: rgba(255, 255, 255, 0.9);
    text-transform: uppercase;
    letter-spacing: 2px;
  }

  .sdt__result-text {
    display: flex;
    flex-direction: column;
    gap: 0.2rem;
  }

  .sdt__result-num {
    font-size: 5rem;
    font-weight: 950;
    line-height: 1;
    color: #fff;
    text-shadow: 0 4px 16px rgba(0,0,0,0.12);
  }

  .sdt__result-unit {
    font-size: 1.15rem;
    font-weight: 700;
    color: rgba(255,255,255,0.9);
  }

  .sdt__result-per {
    font-size: 0.85rem;
    font-weight: 600;
    color: rgba(255,255,255,0.6);
  }

  
  .sdt__section--stats {
    display: flex;
    gap: 0;
  }

  .sdt__stat {
    flex: 1;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.25rem;
    padding: 0 1rem;
  }

  .sdt__stat + .sdt__stat {
    border-left: 1px solid var(--sdt-divider);
  }

  .sdt__stat-icon {
    color: var(--sdt-primary);
    width: 1.6rem;
    height: 1.6rem;
    margin-bottom: 0.2rem;
  }

  .sdt__stat-icon svg { width: 100%; height: 100%; display: block; }

  .sdt__stat-value {
    font-size: 2rem;
    font-weight: 900;
    color: var(--sdt-primary);
    line-height: 1;
  }

  .sdt__stat-unit {
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--sdt-muted);
  }

  .sdt__stat-label {
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--sdt-muted);
    margin-top: 0.15rem;
  }

  
  .sdt__section--recs {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
  }

  .sdt__rec {
    display: flex;
    gap: 0.875rem;
    align-items: flex-start;
  }

  .sdt__rec-icon {
    color: var(--sdt-primary);
    width: 1.75rem;
    height: 1.75rem;
    flex-shrink: 0;
    margin-top: 0.1rem;
  }

  .sdt__rec-icon svg { width: 100%; height: 100%; display: block; }

  .sdt__rec-body { display: flex; flex-direction: column; gap: 0.4rem; }

  .sdt__rec-title {
    font-size: 0.78rem;
    font-weight: 900;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: var(--sdt-primary);
  }

  .sdt__rec-text {
    font-size: 0.875rem;
    line-height: 1.55;
    color: var(--sdt-muted);
    margin: 0;
  }

  
  .sdt__timeline-bar {
    height: 40px;
    border-radius: 0.75rem;
    overflow: hidden;
    display: flex;
    margin-bottom: 0.875rem;
    background: rgba(0,0,0,0.04);
  }

  .sdt__tl-work {
    background: linear-gradient(90deg, var(--sdt-primary) 0%, var(--sdt-secondary) 100%);
    transition: width 0.55s cubic-bezier(0.34, 1.56, 0.64, 1);
    height: 100%;
  }

  .sdt__tl-rest {
    background: linear-gradient(90deg, var(--sdt-accent) 0%, #059669 100%);
    transition: width 0.55s cubic-bezier(0.34, 1.56, 0.64, 1);
    height: 100%;
  }

  .sdt__tl-other { flex: 1; height: 100%; background: rgba(0,0,0,0.04); }

  .sdt__timeline-legend {
    display: flex;
    gap: 2rem;
    flex-wrap: wrap;
  }

  .sdt__legend-item {
    display: flex;
    align-items: center;
    gap: 0.45rem;
    font-size: 0.78rem;
    font-weight: 700;
    color: var(--sdt-muted);
  }

  .sdt__legend-dot {
    width: 10px;
    height: 10px;
    border-radius: 2px;
  }

  .sdt__legend-item--work  .sdt__legend-dot { background: linear-gradient(135deg, var(--sdt-primary), var(--sdt-secondary)); }
  .sdt__legend-item--rest  .sdt__legend-dot { background: linear-gradient(135deg, var(--sdt-accent), #059669); }
  .sdt__legend-item--other .sdt__legend-dot { background: rgba(0,0,0,0.1); }

  
  .theme-dark .sdt {
    --sdt-bg: #0a2030;
    --sdt-border: rgba(6, 182, 212, 0.28);
    --sdt-divider: rgba(6, 182, 212, 0.1);
    --sdt-text: #ecfeff;
    --sdt-muted: #67e8f9;
    --sdt-preset-bg: rgba(6, 182, 212, 0.1);
    --sdt-preset-border: rgba(6, 182, 212, 0.25);
    --sdt-input-bg: rgba(6, 182, 212, 0.1);
    --sdt-input-border: rgba(6, 182, 212, 0.28);
  }

  .theme-dark .sdt__timeline-bar,
  .theme-dark .sdt__tl-other {
    background: rgba(255,255,255,0.04);
  }

  .theme-dark .sdt__legend-item--other .sdt__legend-dot { background: rgba(255,255,255,0.08); }
  .theme-dark .sdt__number { color: #67e8f9; }
  .theme-dark .sdt__stat + .sdt__stat { border-color: rgba(6,182,212,0.12); }

  
  @media (max-width: 768px) {
    .sdt__section { padding: 1.75rem 1.25rem; }

    .sdt__result-inner { flex-direction: column; text-align: center; gap: 1.25rem; }
    .sdt__result-num { font-size: 4rem; }

    .sdt__section--recs { grid-template-columns: 1fr; }

    .sdt__section--stats { flex-direction: column; gap: 1.25rem; }
    .sdt__stat { flex-direction: row; justify-content: flex-start; gap: 0.75rem; padding: 0; }
    .sdt__stat + .sdt__stat { border-left: none; border-top: 1px solid var(--sdt-divider); padding-top: 1.25rem; }
    .sdt__stat-value { font-size: 1.5rem; }
  }

  @media (max-width: 480px) {
    .sdt__ring { width: 120px; height: 120px; }
    .sdt__ring-hole { width: 82px; height: 82px; }
  }