/* Mobile Responsive */
@media (max-width: 640px) {
    .container {
        padding: 32px 20px;
    }

    .app-layout {
        gap: 24px;
    }

    .form-grid {
        gap: 20px;
    }

    .header-title {
        font-size: 28px;
    }

    .metrics-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    .container.app-layout .main-content {
        opacity: 1;
        visibility: visible;
        transform: none;
        transition: none;
    }

    .metric-sub-value {
        display: block;
        margin-left: 0;
        margin-top: 4px;
        font-size: 14px;
    }

    .button-group {
        grid-template-columns: 1fr;
    }

    .input-row {
        grid-template-columns: 1.5fr 1fr;
        gap: 12px;
    }

    .select-field,
    .input-field,
    .custom-dropdown-toggle {
        width: 100%;
        height: 52px;
        padding: 14px 16px;
        min-height: 52px;
    }

    .btn {
        width: 100%;
        min-height: 52px;
    }

    .custom-dropdown-menu {
        position: fixed;
        top: 50% !important;
        left: 50% !important;
        transform: translate(-50%, -50%);
        width: 90%;
        max-width: 400px;
        max-height: 300px;
        z-index: 10000;
        border: none;
        box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2);
        padding: 8px;
        border-radius: 20px;
        animation: modalEnter 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
    }

    .custom-dropdown-overlay {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background-color: rgba(0, 0, 0, 0.5);
        z-index: 9999;
        display: none;
    }

    .custom-dropdown-overlay.show {
        display: block;
    }

    .zone-card {
        padding: 16px;
    }
}

@media (max-width: 400px) {

    .zone-name,
    .race-name {
        font-size: 13.5px;
        letter-spacing: -0.02em;
    }

    .zone-card {
        padding: 14px;
    }

    .zone-pace,
    .race-pace {
        font-size: 13px;
    }
}