* {
    box-sizing: border-box;
}
body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #0f0f0f;
    color: #f1f1f1;
    margin: 0;
    padding: 0;
    text-align: center;
}
header {
    background-color: #1f1f1f;
    padding: 20px 0;
    border-bottom: 1px solid #333;
}
h1 {
    margin: 0;
    font-size: 2.5em;
}
.container {
    padding: 40px;
}
.button {
    padding: 15px 30px;
    background: #4CAF50;
    color: white;
    font-size: 18px;
    border: none;
    border-radius: 10px;
    text-decoration: none;
    margin-top: 30px;
    display: inline-block;
    transition: background 0.3s ease;
}
.button:hover {
    background: #45a049;
}
canvas {
    background: #fff;
    margin-top: 30px;
    border-radius: 8px;
}
button {
    padding: 10px 20px;
    margin-top: 20px;
    font-size: 16px;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    background-color: #4CAF50;
    color: white;
}
button:hover {
    background-color: #3e8e41;
}
ul {
    text-align: left;
    list-style-type: disc;
    padding-left: 40px;
    color: #ccc;
    line-height: 1.6;
}
ul li strong {
    color: #4CAF50;
}
/* Typing effect */
.typewriter {
    overflow: hidden;
    border-right: .15em solid #4CAF50;
    white-space: nowrap;
    margin: 0 auto;
    letter-spacing: .1em;
    animation: typing 3.5s steps(60, end), blink-caret .75s step-end infinite;
    max-width: 100%;
}

@keyframes typing {
    from { width: 0 }
    to { width: 100% }
}

@keyframes blink-caret {
    from, to { border-color: transparent }
    50% { border-color: #4CAF50 }
}
.hero-banner {
    background: linear-gradient(to right, #121212, #1f1f1f);
    padding: 60px 20px;
    color: #f1f1f1;
    text-align: center;
    box-shadow: 0 4px 10px rgba(0,0,0,0.5);
}
.subtitle {
    font-size: 1.2em;
    color: #a0a0a0;
    margin-top: 10px;
}

.intro-text {
    font-size: 1.1em;
    margin: 30px auto;
    max-width: 700px;
}

.coming-soon {
    margin-top: 40px;
    color: #999;
}
.disabled-button {
    display: inline-block;
    padding: 12px 20px;
    background-color: #333;
    color: #777;
    border-radius: 8px;
    margin: 5px;
    font-size: 15px;
    cursor: not-allowed;
    opacity: 0.7;
}
.output-line {
  display: block;
  margin-left: 20px;
  line-height: 1.4;
}
.output-line.root {
  margin-left: 0;
  font-weight: bold;
  color: #00d8ff;
}
.output-line.leaf {
  color: #4caf50;
}