body {
    font-family: 'Noto Sans TC', sans-serif;
    line-height: 1.6;
    margin: 0;
    padding: 0;
    background-color: #f4f7f6;
    color: #333;
}

header {
    background-color: #005f73;
    color: #ffffff;
    padding: 2rem 1rem;
    text-align: center;
}

h1, h2 {
    color: #003440;
}

main {
    max-width: 900px;
    margin: 2rem auto;
    padding: 0 1rem;
}

section {
    background: #ffffff;
    margin-bottom: 2rem;
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
}

.wave-container {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.wave-card {
    flex: 1;
    min-width: 300px;
    background: #e9f5f9;
    padding: 1rem;
    border-left: 5px solid #00a896;
    border-radius: 5px;
}

.interactive-container {
    text-align: center;
    margin-top: 1rem;
}

canvas {
    background-color: #f0f8ff;
    border: 1px solid #ccc;
    cursor: grab;
}

canvas:active {
    cursor: grabbing;
}

.formula {
    background: #fffbe6;
    border: 1px solid #ffe58f;
    padding: 10px;
    text-align: center;
    border-radius: 5px;
    font-size: 1.1rem;
}

.legend {
    text-align: center;
    margin-top: 10px;
}

.legend span {
    margin: 0 10px;
    padding: 2px 5px;
    border-radius: 3px;
}
.p-wave { color: #d90429; font-weight: bold; }
.s-wave { color: #0077b6; font-weight: bold; }
.r-wave { color: #2d6a4f; font-weight: bold; }


.slider-container {
    margin-top: 1rem;
}

footer {
    text-align: center;
    padding: 1rem;
    margin-top: 2rem;
    background: #e0e0e0;
    font-size: 0.9rem;
}