:root {
    --teal-green: #20c997;
    --deep-teal: #138d75;
    --navy-blue: #001f3f;
    --dark-navy: #001737;
    --soft-light-gray: #f4f4f4;
    --clean-white: #ffffff;
    --dark-bg: #1f1f1f;
    --dark-card: #2c2c2c;
    --light-on-dark: #f0f0f0;
    --muted-gray: #aaa;
  }
  
  * {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: "Segoe UI", sans-serif;
  }
  
  body {
    background: var(--soft-light-gray);
    color: var(--navy-blue);
    min-height: 100vh;
    padding: 1rem;
    transition: background 0.3s, color 0.3s;
  }
  
  body.dark {
    background: var(--dark-bg);
    color: var(--light-on-dark);
  }
  
  #themeToggle {
    position: fixed;
    top: 1rem;
    right: 1rem;
    background: none;
    border: none;
    font-size: 1.4rem;
    cursor: pointer;
  }
  
  main {
    display: flex;
    justify-content: center;
    padding: 2rem;
    text-align: center;
  }
  
  .capture-area {
    background: var(--clean-white);
    padding: 2rem;
    border-radius: 16px;
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
    width: 100%;
    max-width: 500px;
  }
  
  body.dark .capture-area {
    background: var(--dark-card);
  }
  
  .capture-area h1 {
    text-align: center;
    margin-bottom: 1rem;
  }
  
  .gradient-text {
    background: linear-gradient(to right, var(--teal-green), var(--deep-teal), var(--navy-blue));
    -webkit-background-clip: text;
    color: transparent;
    font-size: 1.8rem;
    font-weight: bold;
  }
  
  .capture-area p {
    margin-bottom: 1rem;
    color: var(--muted-gray);
  }
  
  button {
    background: var(--teal-green);
    color: white;
    padding: 0.8rem 1.5rem;
    margin-top: 1rem;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    cursor: pointer;
    transition: background 0.3s;
  }
  
  button:hover {
    background: var(--deep-teal);
  }
  
  canvas {
    display: block;
    margin: 1rem auto;
    max-width: 100%;
    border: 1px solid var(--muted-gray);
  }
  
  a#downloadLink {
    display: inline-block;
    margin-top: 1rem;
    background: var(--navy-blue);
    color: white;
    padding: 0.6rem 1.2rem;
    border-radius: 8px;
    text-decoration: none;
  }
  
  #toast {
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--teal-green);
    color: white;
    padding: 10px 20px;
    border-radius: 8px;
    display: none;
  }