* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    line-height: 1.6;
    color: #333;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    min-height: 100vh;
    padding: 40px 20px;
}

h1 {
    color: #2c3e50;
    margin-bottom: 20px;
    font-size: 2.5rem;
}

h1#h100 {
    text-align: center;
    background: linear-gradient(120deg, #3498db, #8e44ad);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-size: 3rem;
    margin-bottom: 30px;
}

h2 {
    color: #34495e;
    margin: 30px 0 15px;
    font-size: 1.8rem;
    border-left: 4px solid #3498db;
    padding-left: 15px;
}

h3 {
    color: #7f8c8d;
    margin: 25px 0 10px;
    font-size: 1.4rem;
}

p {
    max-width: 800px;
    margin: 0 auto 20px;
    padding: 20px 25px;
    background: white;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.border1 {
    border: 2px solid #3498db;
}

.border2 {
    border-radius: 8px;
    padding: 10px 20px;
    display: inline-block;
}

.talk {
    color: #8e44ad;
    font-style: italic;
}

.p1 {
    background: linear-gradient(to right, #ffffff, #f8f9fa);
}

.p2 {
    background: #fff;
    border-left: 4px solid #e74c3c;
}

#h300 {
    text-align: center;
    margin-top: 40px;
    color: #2c3e50;
}