body {
        display: flex;
        flex-direction: column;
        min-height: 100vh;
        width: 100%;
        max-width: 100%;
        overflow-x: hidden;
        font-family: 'Inter', sans-serif;
        background: linear-gradient(135deg, #f5f7fa 0%, #e4e9f2 100%);
        margin: 0;
        padding: clamp(20px, 5vw, 40px) clamp(16px, 4vw, 20px);
        padding: env(safe-area-inset-top, clamp(20px, 5vw, 40px)) 
                env(safe-area-inset-right, clamp(16px, 4vw, 20px)) 
                env(safe-area-inset-bottom, clamp(20px, 5vw, 40px)) 
                env(safe-area-inset-left, clamp(16px, 4vw, 20px));
      }

      h1 {
        color: #2d3748;
        font-weight: 600;
        font-size: clamp(24px, 5vw, 32px);
        margin: 0 0 32px;
        user-select: none;
        line-height: 1.2;
        padding: 0 clamp(12px, 3vw, 24px);
        letter-spacing: -0.01em;
      }

      .compass {
        position: relative;
        width: min(320px, 90vw);
        height: min(320px, 90vw); /* Maintain aspect ratio */
        border-radius: 50%;
        box-shadow: 0 16px 48px rgba(0, 0, 0, 0.12),
                    inset 0 2px 6px rgba(255, 255, 255, 0.95);
        margin: 0 auto 16px;
        background: white;
        padding: 12px;
        user-select: none;
        -webkit-user-select: none;
        -webkit-tap-highlight-color: transparent;
        touch-action: manipulation;
        will-change: transform;
        overscroll-behavior: none;
      }

      .compass > .compass-circle {
        position: absolute;
        width: 90%;
        height: 90%;
        top: 50%;
        left: 50%;
        transform: translate(-50%, -50%);
        transition: transform 0.1s ease-out;
        background: url(assets/compass-pro.png)
          center no-repeat;
        background-size: contain;
        will-change: transform;
        backface-visibility: hidden;
      }
      
      .compass > .my-point {
        opacity: 0;
        width: 20%;
        height: 20%;
        background: rgb(8, 223, 69);
        border-radius: 50%;
        transition: opacity 0.5s ease-out;
      }

      .degree-display {
        margin: 24px auto 0;
        width: fit-content;
        min-height: 44px;
        display: flex;
        align-items: center;
        justify-content: center;
        background: rgba(45, 55, 72, 0.95);
        color: white;
        padding: 10px 20px;
        border-radius: 24px;
        font-size: 18px;
        font-weight: 600;
        min-width: 70px;
        text-align: center;
        user-select: none;
        backdrop-filter: blur(8px);
        box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
      }

      .coordinates-display {
        margin: 12px auto 0;
        display: flex;
        gap: 16px;
        justify-content: center;
        font-size: 14px;
        color: #4a5568;
        background: rgba(255, 255, 255, 0.9);
        padding: 6px 16px;
        border-radius: 12px;
        backdrop-filter: blur(8px);
        box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
      }

      .coordinate {
        display: flex;
        gap: 4px;
        align-items: center;
      }

      .coordinate .label {
        font-weight: 500;
        color: #2d3748;
      }

      .coordinate .value {
        font-family: 'Inter', monospace;
      }

      .coordinate .value a {
        color: #4299e1;
        text-decoration: none;
        transition: color 0.2s ease;
      }
      
      .coordinate .value a:hover {
        color: #2b6cb0;
        cursor: pointer;
        text-decoration: underline;
      }

      .switches-wrapper {
        display: flex;
        gap: 16px;
        justify-content: center;
        margin-top: 24px;
      }

      .switch-wrapper {
        margin: 24px auto 0;
        display: flex;
        align-items: center;
        justify-content: center;
        gap: 12px;
        padding: 8px;
        background: rgba(255, 255, 255, 0.8);
        backdrop-filter: blur(8px);
        border-radius: 16px;
        box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
      }

      .switch-label {
        font-size: 15px;
        color: #2d3748;
        font-weight: 500;
        user-select: none;
      }

      .switch {
        position: relative;
        display: inline-block;
        width: 46px;
        height: 24px;
        min-width: 46px;
      }

      .switch input {
        opacity: 0;
        width: 0;
        height: 0;
      }

      .slider {
        position: absolute;
        cursor: pointer;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background-color: #cbd5e0;
        transition: .3s;
        border-radius: 34px;
      }

      .slider:before {
        position: absolute;
        content: "";
        height: 16px;
        width: 16px;
        left: 3px;
        bottom: 4px;
        background-color: white;
        transition: .3s;
        border-radius: 50%;
        box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
      }

      input:checked + .slider {
        background-color: #4a5568;
      }

      input:checked + .slider:before {
        transform: translateX(22px);
      }

      .switch:hover .slider:before {
        box-shadow: 0 4px 8px rgba(0, 0, 0, 0.15);
      }

      .switch input:focus-visible + .slider {
        box-shadow: 0 0 0 2px rgba(66, 153, 225, 0.5);
      }

      @media (hover: hover) {
        .switch:hover .slider {
          background-color: #a0aec0;
        }
        
        input:checked + .slider:hover {
          background-color: #2d3748;
        }
      }

      @media (max-width: 480px) {
        .switch-wrapper {
          margin: 16px auto 0;
          padding: 8px 16px;
          max-width: 180px;
          border-radius: 24px;
          background: white;
          box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
        }

        .switch-label {
          font-size: 14px;
          font-weight: 600;
          color: #2d3748;
        }

        .compass {
          margin: 0 auto 16px;
        }
        
        .floating-btn {
          margin: 8px;
        }
      }

      .content-section {
        max-width: 800px;
        margin: 48px auto 0;
        padding: clamp(16px, 4vw, 32px);
        background: white;
        border-radius: 16px;
        box-shadow: 0 4px 16px rgba(0, 0, 0, 0.05);
        width: min(800px, calc(100% - 32px));
        box-sizing: border-box;
      }

      .content-section h2 {
        color: #2d3748;
        font-size: clamp(20px, 5vw, 24px);
        margin: 0 0 16px;
      }

      .content-section h3 {
        color: #2d3748;
        font-size: clamp(18px, 4vw, 20px);
        margin: 24px 0 12px;
      }

      .content-section p {
        color: #4a5568;
        line-height: 1.6;
        margin: clamp(12px, 3vw, 16px) 0;
        font-size: clamp(14px, 4vw, 16px);
      }

      .content-section ul {
        margin: clamp(12px, 3vw, 16px) 0;
        padding-left: clamp(20px, 5vw, 24px);
      }
      
      .content-section ol {
        margin: clamp(12px, 3vw, 16px) 0;
        padding-left: clamp(20px, 5vw, 24px);
      }

      .content-section li {
        color: #4a5568;
        margin: clamp(6px, 2vw, 8px) 0;
        line-height: 1.6;
        font-size: clamp(14px, 4vw, 16px);
      }
      
      .content-section code {
        display: inline-block;
        background: #f7fafc;
        padding: 4px 12px;
        border-radius: 4px;
        font-family: monospace;
        font-size: 14px;
        color: #2d3748;
        margin: 8px 0;
        border: 1px solid #e2e8f0;
      }
      
      .copy-wrapper {
        display: flex;
        align-items: center;
        gap: 12px;
        margin: 8px 0;
        flex-wrap: wrap;
      }
      
      .copy-btn {
        background: #4a5568;
        color: white;
        border: none;
        padding: 8px 16px;
        min-height: 44px;
        min-width: 80px;
        border-radius: 4px;
        font-size: 13px;
        cursor: pointer;
        transition: all 0.2s ease;
        -webkit-tap-highlight-color: transparent;
        touch-action: manipulation;
      }
      
      .copy-btn:hover {
        background: #2d3748;
      }
      
      .copy-btn:active {
        transform: scale(0.95);
      }

      .faq-question {
        color: #2d3748;
        font-weight: 600;
        margin: clamp(20px, 5vw, 24px) 0 clamp(6px, 2vw, 8px);
        font-size: clamp(16px, 4vw, 18px);
      }

      .app-promotion {
        width: min(800px, calc(100% - 32px));
        margin: 32px auto;
        padding: clamp(16px, 4vw, 32px);
        background: linear-gradient(135deg, #2d3748 0%, #1a202c 100%);
        border-radius: 16px;
        color: white;
        text-align: center;
        box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
        box-sizing: border-box;
      }

      .app-promotion h2 {
        font-size: clamp(22px, 5vw, 28px);
        margin: 0 0 clamp(12px, 3vw, 16px);
        line-height: 1.2;
      }

      .app-promotion p {
        opacity: 0.9;
        margin: 0 0 clamp(24px, 6vw, 32px);
        font-size: clamp(14px, 4vw, 18px);
        line-height: 1.5;
        max-width: 600px;
        margin-left: auto;
        margin-right: auto;
      }

      .app-buttons {
        display: flex;
        gap: clamp(8px, 2vw, 16px);
        justify-content: center;
        flex-wrap: wrap;
        margin: 0 auto;
        max-width: 100%;
      }

      .app-button {
        display: flex;
        align-items: center;
        gap: clamp(8px, 2vw, 12px);
        background: white;
        color: #2d3748;
        padding: clamp(10px, 2.5vw, 12px) clamp(16px, 4vw, 24px);
        border-radius: 12px;
        text-decoration: none;
        font-weight: 600;
        transition: transform 0.2s ease, box-shadow 0.2s ease;
        width: min(240px, calc(50% - 8px));
        min-width: 140px;
        justify-content: center;
        font-size: clamp(14px, 3.5vw, 16px);
      }

      .app-button:hover {
        transform: translateY(-2px);
        box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
      }

      .app-button:active {
        transform: translateY(0);
        box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
      }

      .app-button img {
        width: clamp(20px, 5vw, 24px);
        height: clamp(20px, 5vw, 24px);
        object-fit: contain;
      }

      @media (max-width: 480px) {
        body {
          padding: 16px;
          padding: env(safe-area-inset-top, 16px)
                  env(safe-area-inset-right, 16px)
                  env(safe-area-inset-bottom, 16px)
                  env(safe-area-inset-left, 16px);
          min-height: -webkit-fill-available;
          overscroll-behavior-y: none;
        }
        
        h1 {
          margin: 0 0 24px;
          font-weight: 700;
          text-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
        }

        .compass {
          margin: 0 auto 24px;
        }

        .degree-display {
          font-size: 16px;
          padding: 12px 24px;
          margin: 16px auto 0;
          min-height: 48px; /* Increased touch target */
        }

        .coordinates-display {
          padding: 12px 24px;
          margin: 8px auto 0;
        }

        .switch-wrapper {
          padding: 8px 16px;
          margin: 16px auto 0;
        }

        .switch {
          margin: 4px 0;
        }

        .app-buttons {
          gap: 8px;
          align-items: center;
          gap: 16px;
        }

        .app-button {
          width: 100%;
          max-width: 280px;
          min-height: 52px; /* Increased touch target */
          box-sizing: border-box;
        }

        .content-section {
          margin-top: 32px;
          padding: 24px 16px;
        }

        .copy-btn {
          min-height: 48px;
          min-width: 100px;
          width: 100%;
          margin-top: 4px;
          font-size: 14px;
          padding: 12px 20px;
        }
      }

      .floating-btn {
        display: block;
        margin: 0 auto 24px;
        min-height: 44px;
        min-width: 120px;
        background: #4a5568;
        -webkit-tap-highlight-color: transparent;
        color: white;
        border: none;
        padding: 12px 24px;
        border-radius: 8px;
        font-weight: 500;
        cursor: pointer;
        transition: all 0.2s ease;
        font-family: 'Inter', sans-serif;
        font-size: 15px;
        box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
        z-index: 10;
        touch-action: manipulation;
      }

      .floating-btn:hover {
        background: #2d3748;
        box-shadow: 0 6px 16px rgba(0, 0, 0, 0.2);
        transform: translateY(-2px);
      }

      .floating-btn:active {
        transform: translateY(0);
        box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
      }

      .content-section {
        max-width: 800px;
        margin: 48px auto 0;
        padding: clamp(16px, 4vw, 32px);
        background: white;
        border-radius: 16px;
        box-shadow: 0 4px 16px rgba(0, 0, 0, 0.05);
        width: min(800px, calc(100% - 32px));
        box-sizing: border-box;
      }