body {
    font-family: 'Inter', sans-serif;
    background-color: #f8fafc;
}
.nav-link {
    transition: all 0.3s ease;
    border-bottom: 2px solid transparent;
    white-space: nowrap;
}
.nav-link.active {
    border-bottom-color: #0d9488;
    color: #0d9488;
    font-weight: 600;
}
.content-section {
    display: none;
}
.content-section.active {
    display: block;
}
.day-selector.active {
    background-color: #0d9488;
    color: white;
}
.workout-table {
    display: none;
}
.workout-table.active {
    display: table;
}
.chart-container {
    position: relative;
    width: 100%;
    max-width: 400px;
    margin-left: auto;
    margin-right: auto;
    height: 300px;
    max-height: 400px;
}
@media (min-width: 768px) {
    .chart-container {
        height: 350px;
    }
}
.modal {
    display: none;
    position: fixed;
    z-index: 100;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(0,0,0,0.7);
    justify-content: center;
    align-items: center;
}
.modal-content {
    margin: auto;
    display: block;
    max-width: 80%;
    max-height: 80%;
}
.modal-close {
    position: absolute;
    top: 15px;
    right: 35px;
    color: #f1f1f1;
    font-size: 40px;
    font-weight: bold;
    transition: 0.3s;
    cursor: pointer;
}
#chat-messages {
    display: flex;
    flex-direction: column;
}
.ai-typing {
    color: #64748b;
    font-style: italic;
}