.ct-card {
    --ct-bg-card: #fff;
    --ct-bg-image: #f0fdf4;
    --ct-gradient-from: #fff;
    --ct-border: #d1fae5;
    --ct-shadow: rgba(0, 0, 0, 0.1);
    --ct-circle-bg: #f0fdf4;
    --ct-circle-border: #a7f3d0;
    --ct-circle-shadow: rgba(0, 0, 0, 0.08);
    --ct-temp-color: #064e3b;
    --ct-unit-color: #059669;
    --ct-bpm-color: #6b7280;
    --ct-btn-border: #d1fae5;
    --ct-btn-color: #374151;
    --ct-btn-hover-bg: #ecfdf5;
    --ct-btn-hover-color: #064e3b;
    --ct-audio-active: #059669;
    --ct-glow: rgba(16, 185, 129, 0.15);
    --ct-tap-hint: rgba(4, 47, 46, 0.65);
    --ct-tap-bg-from: #84cc16;
    --ct-tap-bg-to: #059669;
    --ct-tap-shadow: rgba(5, 150, 105, 0.35);
    --ct-tap-border: rgba(16, 185, 129, 0.3);
    --ct-fill-colors: #3b82f6, #10b981, #ef4444;

    position: relative;
    width: 100%;
    max-width: 32rem;
    margin: 0 auto;
    background: var(--ct-bg-card);
    border-radius: 2rem;
    overflow: hidden;
    box-shadow: 0 25px 50px -12px var(--ct-shadow);
    border: 1px solid var(--ct-border);
    transition: background 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
  }

  .theme-dark .ct-card {
    --ct-bg-card: #0f172a;
    --ct-bg-image: #1e293b;
    --ct-gradient-from: #0f172a;
    --ct-border: #1e293b;
    --ct-shadow: rgba(0, 0, 0, 0.5);
    --ct-circle-bg: #1e293b;
    --ct-circle-border: #334155;
    --ct-circle-shadow: rgba(0, 0, 0, 0.3);
    --ct-temp-color: #fff;
    --ct-unit-color: #34d399;
    --ct-bpm-color: #64748b;
    --ct-btn-border: #334155;
    --ct-btn-color: #94a3b8;
    --ct-btn-hover-bg: #1e293b;
    --ct-btn-hover-color: #fff;
    --ct-audio-active: #34d399;
    --ct-glow: rgba(16, 185, 129, 0.2);
    --ct-tap-hint: rgba(209, 250, 229, 0.8);
    --ct-tap-shadow: rgba(6, 78, 59, 0.5);
  }

  .ct-image-wrapper {
    position: relative;
    height: 16rem;
    width: 100%;
    background: var(--ct-bg-image);
    overflow: hidden;
  }

  .ct-image {
    display: block;
    object-fit: cover;
    width: 100%;
    height: 100%;
  }

  .ct-image-gradient {
    position: absolute;
    inset: 0;
    background: linear-gradient(to top, var(--ct-gradient-from), transparent, transparent);
    opacity: 0.9;
  }

  .ct-body {
    padding: 2rem;
    margin-top: -5rem;
    position: relative;
    z-index: 10;
    display: flex;
    flex-direction: column;
    align-items: center;
  }

  .ct-display-wrapper {
    position: relative;
    margin-bottom: 2rem;
  }

  .ct-glow {
    position: absolute;
    inset: -1rem;
    background: var(--ct-glow);
    border-radius: 50%;
    filter: blur(2rem);
    transition: opacity 1s ease;
    opacity: 0;
    pointer-events: none;
  }

  .ct-display-wrapper.has-value .ct-glow {
    opacity: 1;
  }

  .ct-circle {
    width: 12rem;
    height: 12rem;
    background: var(--ct-circle-bg);
    border-radius: 50%;
    border: 4px solid var(--ct-circle-border);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 20px 25px -5px var(--ct-circle-shadow);
    overflow: hidden;
    position: relative;
    transition: background 0.3s ease, border-color 0.3s ease;
  }

  .ct-inner {
    position: relative;
    z-index: 2;
    text-align: center;
  }

  .ct-temp-row {
    display: flex;
    align-items: baseline;
    justify-content: center;
    gap: 0.15rem;
  }

  .ct-temp-value {
    font-size: 3rem;
    font-weight: 700;
    color: var(--ct-temp-color);
    transition: all 0.3s ease;
  }

  .ct-temp-unit {
    font-size: 1.5rem;
    color: var(--ct-unit-color);
    font-weight: 700;
  }

  .ct-bpm-label {
    font-size: 0.75rem;
    color: var(--ct-bpm-color);
    margin-top: 0.5rem;
  }

  .ct-fill {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: linear-gradient(to top, var(--ct-fill-colors));
    transition: height 1s ease, opacity 1s ease;
    opacity: 0.2;
    height: 0;
  }

  .ct-tap-btn {
    width: 100%;
    max-width: 20rem;
    aspect-ratio: 1;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--ct-tap-bg-from), var(--ct-tap-bg-to));
    box-shadow: 0 10px 15px -3px var(--ct-tap-shadow);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.25rem;
    transform: scale(1);
    transition: transform 0.15s ease, box-shadow 0.15s ease;
    border: 4px solid var(--ct-tap-border);
    margin-bottom: 1.5rem;
    cursor: pointer;
  }

  .ct-tap-btn:hover {
    transform: scale(1.05);
    box-shadow: 0 10px 20px var(--ct-glow);
  }

  .ct-tap-btn:active {
    transform: scale(0.95);
  }

  .ct-tap-btn.ct-tap-pressed {
    transform: scale(0.95);
  }

  .ct-tap-icon {
    font-size: 2.5rem;
    color: #fff;
    pointer-events: none;
  }

  .ct-tap-label {
    font-size: 1.25rem;
    font-weight: 700;
    color: #fff;
    text-transform: uppercase;
    letter-spacing: 0.2em;
    pointer-events: none;
  }

  .ct-tap-hint {
    font-size: 0.75rem;
    color: var(--ct-tap-hint);
    pointer-events: none;
  }

  .ct-controls {
    display: flex;
    gap: 1rem;
  }

  .ct-reset-btn,
  .ct-audio-btn {
    padding: 0.5rem 1.5rem;
    border-radius: 9999px;
    border: 1px solid var(--ct-btn-border);
    color: var(--ct-btn-color);
    background: transparent;
    cursor: pointer;
    font-size: 0.875rem;
    transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
  }

  .ct-reset-btn:hover,
  .ct-audio-btn:hover {
    background: var(--ct-btn-hover-bg);
    color: var(--ct-btn-hover-color);
  }

  .ct-audio-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
  }

  .ct-audio-btn.audio-active {
    color: var(--ct-audio-active);
  }