body {
    margin: 0;
    font-family: "Helvetica Neue", "Microsoft YaHei", sans-serif;
    background: linear-gradient(135deg, #f5f7fa 0%, #e4e8f0 100%);
    min-height: 100vh;
    color: #2c3e50;
}

header {
    background: rgba(255, 255, 255, 0.95);
    box-shadow: 0 2px 15px rgba(0, 0, 0, 0.1);
    padding: 20px 0;
    position: relative;
    z-index: 100;
}

.header-title {
    font-size: 2rem;
    font-weight: 600;
    color: #1a73e8;
    text-align: center;
    margin: 0;
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.1);
}

main {
    max-width: 1000px;
    margin: 40px auto;
    padding: 0 20px;
}

h2 {
    text-align: center;
    margin-bottom: 40px;
    color: #2c3e50;
    font-weight: 600;
    font-size: 1.8rem;
}

ul#speedList {
    list-style: none;
    padding: 0;
    margin: 0;
}

ul#speedList li {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: rgba(255, 255, 255, 0.95);
    border: none;
    padding: 20px 25px;
    border-radius: 12px;
    margin-bottom: 15px;
    font-size: 1.1rem;
    transition: all 0.3s ease;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
}

ul#speedList li:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 15px rgba(0, 0, 0, 0.1);
    background: #ffffff;
}

ul#speedList a {
    color: #1a73e8;
    text-decoration: none;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 10px;
}

ul#speedList a:hover {
    color: #1557b0;
}

ul#speedList a i {
    font-size: 1.2rem;
}

ul#speedList span {
    color: #666;
    font-size: 0.95rem;
    padding: 5px 12px;
    background: #f8f9fa;
    border-radius: 20px;
    transition: all 0.3s ease;
}

button {
    display: block;
    margin: 40px auto 0;
    padding: 15px 30px;
    font-size: 1.1rem;
    background: linear-gradient(135deg, #1a73e8 0%, #1557b0 100%);
    color: white;
    border: none;
    border-radius: 30px;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(26, 115, 232, 0.3);
}

button:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(26, 115, 232, 0.4);
    background: linear-gradient(135deg, #1557b0 0%, #1a73e8 100%);
}

footer {
    text-align: center;
    padding: 30px 20px;
    color: #666;
    background: rgba(255, 255, 255, 0.95);
    border-top: 1px solid rgba(0, 0, 0, 0.05);
    margin-top: 40px;
}

@media (max-width: 768px) {
    .header-title {
        font-size: 1.5rem;
    }

    h2 {
        font-size: 1.4rem;
        margin-bottom: 30px;
    }

    ul#speedList li {
        padding: 15px 20px;
        font-size: 1rem;
    }

    button {
        padding: 12px 25px;
        font-size: 1rem;
    }
}

.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(26, 115, 232, 0.3);
    border-radius: 50%;
    border-top-color: #1a73e8;
    animation: spin 1s ease-in-out infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}