/* ── main container ── */
        .tracking-container {
            width: 100%;
            background: #F8FAFC;
            position: relative;
            display: flex;
            flex-direction: column;
            min-height: 100dvh;
            overflow: hidden;
        }

        /* ── header ── */
        .header {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 24px 20px 10px;
            z-index: 1000;
            pointer-events: none;
        }

        .header>* {
            pointer-events: auto;
        }

        .header .btn-back {
            position: relative;
            z-index: 2;
        }

        .header-title-badge {
            position: absolute;
            left: 50%;
            transform: translateX(-50%);
            z-index: 1;
            max-width: calc(100% - 140px);
        }

        .header #viewToggleButton {
            position: relative;
            z-index: 2;
            margin-left: auto;
        }